Detection Of Current Or Voltage Differential (e.g., Slope, Etc.) Patents (Class 320/151)
  • Patent number: 10202041
    Abstract: A battery monitoring system, comprises a battery state detection circuit that detects battery states of a plurality of battery cells that are connected in series, based on respective cell voltages of the plurality of battery cells, and a control circuit that monitors state of a battery cell, based on each cell voltage of the plurality of battery cells. The control circuit inputs pseudo voltage information to the battery state detection circuit, and thereby diagnoses whether or not the battery state detection circuit is operating normally.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: February 12, 2019
    Assignees: Hitachi, Ltd., Hitachi Automotive Systems, Ltd.
    Inventors: Akihiko Kudo, Mutsumi Kikuchi, Gosuke Shibahara, Akihiko Emori, Yasuo Uemura, Tatsumi Yamauchi, Kenji Kubo, Masahito Sonehara, Masahiko Amano, Yoshinori Aoshima
  • Patent number: 9882411
    Abstract: A lithium-ion battery includes a lithium-ion cell, a positive electrode terminal, a positive/negative electrode insulation sheet, a connector and a housing used as a negative electrode. The lithium-ion cell is arranged in the housing, the connector is arranged between the lithium-ion cell and the housing. The positive electrode terminal is installed on one end of the lithium ion cell. A circuit board is arranged between the battery positive/negative electrode and the lithium-ion cell. A voltage/current control and overcharge/over-discharge protection circuit is integrated on the circuit board. The voltage/current control and overcharge/over-discharge protection circuit can adjust the voltage of the lithium-ion battery to be a voltage of 1.5V/1.2V. The shape and size of the housing can be designed to be any shapes to replace traditional dry batteries according to requirements. The lithium-ion battery can be designed to be using the same port to do the discharging and charging work.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: January 30, 2018
    Assignee: MINWA ENERGY LITHIUM BATTERY TECHNOLOGY CO. LIMITED
    Inventor: Hak Wah Lau
  • Patent number: 9851413
    Abstract: A method and apparatus for estimating current is disclosed. The current estimation apparatus may receive a voltage value of a battery pack and voltage values of cells included in the battery pack, and may estimate a current of the battery pack based on the voltage value of the battery pack, the voltage values of the cells included in the battery pack, and resistance components within the battery pack.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: December 26, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jinyong Jeon
  • Patent number: 9726731
    Abstract: A battery pack, a method for detecting the battery pack, a charging assembly, and an electric tool are provided for detecting voltage and disconnection of the battery cells. The battery pack may have an output voltage of at least 56V and may include a plurality of series connection units. A voltage detecting module may be utilized for detecting voltage in the battery pack. A battery control module configured to control voltage detecting module may also be employed. The method may involve determining whether the series connection units are disconnected based on rates of voltage change or internal-resistance of the series connection units.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: August 8, 2017
    Assignee: Chervon (HK) Limited
    Inventors: Dezhong Yang, Pingbo Shi, Lei Liu, Zheng Geng, Lei Wang, Junya Duan, Yingdian Xiang
  • Patent number: 9413189
    Abstract: A method (300) and system (600) of adjusting a charging current to one or more cells (601) is provided. The method includes obtaining (301) a plurality of charging time periods, where each charging time period defined as a time period required to charge the one or more cells with a predefined current at one of a plurality of different temperatures. A temperature of the one or more cells is determined (302). A predetermined current is scaled (306) by a quotient of a first charging time period defined by a first one of the plurality of different temperatures divided by a second charging time period defined by a second one of the plurality of different temperatures to obtain a magnitude of the charging current. The cells are charged (307) with the charging current at the magnitude to more rapidly charge the one or more cells at temperatures above room temperature.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: August 9, 2016
    Assignee: GOOGLE TECHNOLOGY HOLDINGS LLC
    Inventors: Hossein Maleki, Jason N. Howard
  • Patent number: 9211802
    Abstract: System and methods for identifying a weak subdivision in a battery system are presented. In certain embodiments, a system may include a battery pack that includes multiple subdivisions. A measurement system may be configured to determine multiple subdivision electrical parameters associated with the subdivisions. A battery control system may identify a weakest subdivision based one on or more calculated derivative ratios of a subdivision electrical parameter associated with one subdivision of the battery pack relative to a subdivision electrical parameter associated with another subdivision.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: December 15, 2015
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Robert C. Baraszu, Kurt M. Johnson, Damon R. Frisch
  • Patent number: 9035619
    Abstract: Temperature characteristics of battery cells are detected. In accordance with one or more embodiments, an intercept frequency is detected for each battery cell, at which frequency an imaginary part of a plot of impedance values of the battery cell exhibits a zero crossing. The impedance values correspond to current injected into the cell. A temperature of the cell is determined based upon the detected intercept frequency for the cell and stored data that models operation of the cell. Various approaches are implemented with different types of circuits coupled to detect the impedance values of the respective cells.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: May 19, 2015
    Assignee: DATANG NXP SEMICONDUCTORS CO., LTD.
    Inventors: Johannes van Lammeren, Matheus Johannus Gerardus Lammers
  • Patent number: 9018905
    Abstract: The present invention relates to a battery management apparatus of a high voltage battery for a hybrid vehicle, in more detail, a battery management apparatus of a high voltage battery for a hybrid vehicle which includes: a plurality of battery packs including a plurality of unit cells; slave battery management modules measuring and monitoring temperature and voltage of the unit cells in the battery packs; temperature/voltage measurement wires connecting the unit cells with adjacent unit cells for the slave battery management modules to measure temperature and voltage between the unit cells and the adjacent unit cells; a master battery management module connected with the slave battery management modules; and communication wires connecting the modules.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: April 28, 2015
    Assignee: SK Innovation Co., Ltd.
    Inventors: Jae Hwan Lim, Jeong Hwan Yang, Soo Yeup Jang
  • Patent number: 8988045
    Abstract: The method for charging or discharging a battery comprises measurement of the voltage at the terminals of the battery and comparison of the measured voltage with an end of charging or discharging voltage threshold. The method also comprises measurement of a temperature representative of the temperature of the battery and measurement of the current flowing in the battery to form a pair of measurements. The voltage threshold is then determined according to the pair of measurements. Charging or discharging of the battery is stopped when the voltage threshold is reached.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: March 24, 2015
    Assignee: Commissariat a l'Energie Atomique et aux Energies Alternatives
    Inventors: Jean-Marie Klein, Arnaud Delaille, Sylvie Genies
  • Patent number: 8965723
    Abstract: Provided are battery SOC estimating apparatus and method. The battery SOC estimating apparatus according to the present invention includes a first SOC calculating unit which applies a predetermined parameter to calculate a first state of charge (SOC) of a battery; one or more second SOC calculating units which individually apply different parameters to calculate one or more second SOCs of the battery; and an optimal parameter extracting unit which confirms a second SOC which is the closest to an actual SOC of the battery from one or more second SOCs to extract a parameter which is applied to the second SOC which is the closest to the actual SOC as an optimal parameter, in which the first SOC calculating unit applies the optimal parameter to calculate a final SOC of the battery.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: February 24, 2015
    Assignee: LG Chem, Ltd.
    Inventors: Youngchang Jo, Kiwook Jang
  • Patent number: 8958934
    Abstract: A battery pack includes: a battery unit in which a plurality of battery modules with a plurality of secondary batteries connected in series to each other is connected in parallel to each other so that output current; and a battery management unit. The battery management unit calculates a first allowable current value of each of the plurality of battery modules and calculates second allowable current values of the other battery modules based on the first allowable current value of one battery module from the plurality of battery modules. The battery management unit calculates a value corresponding to the sum of the first allowable current value used as the reference and the respective second current values as an allowable current value when each of the second allowable current values is equal to or smaller than the first allowable current value of the corresponding battery module.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: February 17, 2015
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Takehiko Nishida
  • Patent number: 8917062
    Abstract: The present invention discloses a charge control circuit for supplying power from an external power source to a first common node and charging a second common node from the first common node. A regulator circuit is coupled between the external power source and the first common node, and a transistor is coupled between the first common node and the second common node. The present invention detects an operation parameter of the transistor and controls an internal voltage source to generate a non-predetermined voltage difference accordingly. When the sum of the voltage at the second common node and the non-predetermined voltage is equal to or higher than the reference voltage, the voltage at the first common node is regulated to a level higher than the voltage at the second common node, and the transistor is in an optimum conductive state.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: December 23, 2014
    Assignee: Richtek Technology Corporation
    Inventors: Chien-Ping Lu, Nien-Hui Kung, Li-Wei Lee, Chia-Hsiang Lin, Chen-Hsiang Hsiao, Ko-Ching Su
  • Patent number: 8786260
    Abstract: There is provided a method of thermally controlling an electric storage device. The method comprises increasing cooling medium supplied to the electric storage as an electric charge stored in the electric storage device increases. According to the method, by increasing the cooling medium supplied to the electric storage device as an electric charge stored in the electric storage device increases, the electric storage device may be kept at a temperature that increases the efficiency of charging or discharging the electric storage device. It is asserted to be more efficient to lower the temperature of the electric storage device when more electric charge is stored in the electric storage device. Also, an adequate amount of the cooling medium may be supplied to the electric storage. As a result, the overall efficiency of the electric system may be improved.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: July 22, 2014
    Assignee: Mazda Motor Corporation
    Inventors: Hideyasu Takatsuji, Michio Yoshino, Seiji Sadahira
  • Patent number: 8779725
    Abstract: Improved protection for a rechargeable battery from damage by being discharged below a cut-off voltage is provided. The measured voltage of a battery under load is lower than the measured voltage of the battery under no load. As the cut-off voltage for the battery is specified as a no load voltage, comparing the measured voltage of the battery under load to the cut-off voltage would result in stopping use of the battery with useable charge remaining. Through testing, a set of relationships for estimating the no load voltage of a battery under load has been determined. Using this set of relationships with battery measurements, an estimated no load voltage for the battery is determined. This estimated no load voltage is compared to the cut-off voltage. This allows for full use of the battery while stopping use of the battery when its voltage reaches the cut-off, thereby preventing damage.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: July 15, 2014
    Assignee: Zero Motorcycles, Inc.
    Inventor: Nathan Glenn Knight
  • Patent number: 8502541
    Abstract: A method of evaluating battery packs is described. The method includes measuring a cell open voltage for each battery cell group in a section of battery cells; measuring a voltage under charge, or a voltage under load, or both, at a predetermined time interval for each battery cell group in the section of battery cells; determining the magnitude of the difference between the open cell voltage and the voltage under charge, or the voltage under load, or both, for each battery cell group in the section of battery cells by subtracting the voltage under charge from the cell open voltage, or subtracting the voltage under load from the cell open voltage, or both; and determining if the magnitude of the difference between the open cell voltage and the voltage under charge, or the voltage under load, or both, for each battery cell group in the section of battery cells exceeds a predetermined level.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: August 6, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Robert W. Chalfant, Jason A. Lupienski, John D. Tompkins
  • Patent number: 8450982
    Abstract: A charge control circuit equipped with a function of controlling a charging current to be supplied to a secondary battery, comprises: a detecting unit for monitoring a temperature; and a charge control unit for controlling so as to break the charging current when the monitored temperature rises to a temperature equal to or more than a predetermined set temperature, decrease the charging current as the monitored temperature becomes higher when the monitored temperature is in a predetermined temperature range lower than the set temperature, flow the charging current having a predetermined current value in a state where the monitored temperature is lower than a lower limit temperature of the temperature range, or flow the charging current having a current value smaller than the current value when the monitored temperature is within a range of from an upper limit temperature of the temperature range to the set temperature.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: May 28, 2013
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Hiroki Matsuda, Junji Takeshita, Yuji Yamanaka
  • Patent number: 8446130
    Abstract: A charging circuit for charging a battery includes a processor, a switching circuit, a voltage converter, and a power voltage detecting circuit. A first terminal of the switching circuit is connected to a power source. A second terminal of the switching circuit is connected to a first output of the processor. A first terminal of the voltage converter is connected to a third terminal of the switching circuit. A second terminal of the voltage converter is connected to the battery. The power voltage detecting circuit is connected to the power source, and a first input and a second output of the processor.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: May 21, 2013
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Ming-Yuan Hsu
  • Patent number: 8441263
    Abstract: In a voltage monitor, an abnormality detecting unit receives first information outputted from a first obtaining unit and second information outputted from a second obtaining unit, and determines that an abnormality that affects on at least one of first and second diagnostic thresholds arises in the voltage monitor when the first information is different from the second information. The abnormality detecting unit receives a first forced signal outputted from a first forced-output unit and a second forced signal outputted from a second forced-output unit. The abnormality detecting unit determines whether a timing at which the level of the first diagnostic threshold is switched for each step is deviated from a timing at which the level of the second diagnostic threshold is switched for a corresponding step based on a result of a comparison between the first forced signal and the second forced signal.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: May 14, 2013
    Assignee: Denso Corporation
    Inventor: Tomomichi Mizoguchi
  • Patent number: 8441232
    Abstract: The electronic apparatus allows a user to arbitrarily set a display of a remaining battery level. The apparatus includes a detector which detects a remaining battery level of a battery, and a threshold-value-setting part which is operated by a user to set a threshold value for performing a display relating to the remaining battery level. The apparatus further includes a controller which displays in a display device an image representing the remaining battery level in accordance with the result of a comparison between the remaining battery level detected by the detector and the threshold value set with the threshold-value-setting part.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: May 14, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiromi Hayasaki
  • Patent number: 8427102
    Abstract: An apparatus is provided for an electronic device. The apparatus includes a dynamic electrical load, a secondary power coil receiver module that inductively receives a current from a primary coil of an power conversion system, a means for monitoring a current in the secondary receiver module being delivered to the dynamic load, a means for transmitting a power control signal to the power conversion system through the secondary charging coil, a current monitoring circuit that measures a current delivered to the dynamic load and a current limiter circuit that limits the current to the dynamic load based upon the measured charging current.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: April 23, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Michael Hanley, Wayne Anderson
  • Patent number: 8373389
    Abstract: A charging system which is particularly suitable for recharging the batteries of electrically powered motor vehicles using a charge head with multiple contacts that mate with an array of charge receiving electrodes onboard the vehicle being recharged. The charge head is supported from overhead, and may, using a power assisted system, be lowered, into place against the array of charge receiving electrodes onboard the vehicle. Switches may be spaced apart so that, like the grasping elements of the handle, use of both hands is required. The charge head causes breaking of series connections of batteries within the vehicle so that individual batteries may be charged in parallel. A battery temperature monitor is provided. An annunciator locally or remotely signals errors or indicates completion of charge. Payments are accepted near the charge head, thereby allowing for commercial operation.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: February 12, 2013
    Inventor: Berkley C. Badger
  • Patent number: 8344696
    Abstract: A charging signal Vi responding to a charging current is inputted to one input terminal (?) of an operational amplifier 95 forming a comparator and a setting signal Vr corresponding to a setting current value is inputted to the other input terminal (+) of the operational amplifier 95. When the charging signal Vi is not higher than the setting signal Vr, a charging stop signal is generated from the output terminal of the operational amplifier 95 to interrupt a switch unit 4. A starting signal Vcc larger than the setting signal Vr applied to the other input terminal (+) is applied to the one input terminal (?) of the operational amplifier 95 through a condenser 94 till a prescribed time elapses from the start of a charging operation to generate a charging start signal from the output terminal of the operational amplifier 95 and electrically conduct the switch unit 4.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: January 1, 2013
    Assignee: Hitachi Koko Co., Ltd.
    Inventors: Takao Aradachi, Kazuhiko Funabashi
  • Patent number: 8314592
    Abstract: An energy storage unit has several storage elements (2, 2?) which are switched in series and a charge redistribution circuit (6, 6?). The latter is installed in such a manner that the voltage of the storage element (UELn, UEln?) is measured and compared with a voltage threshold value (UTHRn, UTHR, UTHRn?, UTHR?). When the threshold value is exceeded by a storage element, it removes charge from said storage element, thus reducing its voltage. According to one aspect, a storage-related temperature determination is conducted, and the threshold value is set variably in dependence on the determined temperature (Tn, T) in such a manner that it is reduced as the temperature increases. According to a further aspect, the threshold value is set variably in dependence on the current vehicle operating state, in such a manner that it is set higher for relatively brief periods of time when the storage or removal requirement is relatively high.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: November 20, 2012
    Assignee: Conti Temic Microelectronic GmbH
    Inventors: Axel Rudorff, Manfred Malik
  • Patent number: 8212522
    Abstract: A battery assembly having batteries connected in series to form rows and columns of battery cells into packs that combine the energy of multiple batteries. The battery cells are joined together to form columns of cells connected mechanically together by an exterior connection sleeve, and mechanically and electrically connected together by a conductive epoxy joining the end of one cell to the end of an adjacent cell in series. The columns of cells are mounted and held in place by racks, with bolts passing through the racks to form a sandwich structure that secures the position and orientation of the cells and columns, and that maintains the electrical connection between joined cells. Perpendicularly disposed to the direction of the columns are a series of conductive bands that join adjacent cells together along rows of cells.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: July 3, 2012
    Inventors: Larry L. Deal, Gary J. Gloceri, Adam G. Sciriha, Todd A. Kendall, Wayne B. Uhrick, Phillip Piatkowski, Jr., Leah M. Piatkowski, legal representative, Sarwar Islam, Ladislau M. Mako, Theodore L. Hoag
  • Patent number: 8179139
    Abstract: The rechargeable battery abnormality detection apparatus is provided with an internal short circuit detection section (20b) that monitors rechargeable battery (1) voltage change when no charging or discharging takes place, and detects internal short circuit abnormality when battery voltage drop during a predetermined time period exceeds a preset threshold voltage; a degradation appraisal section (20d) that judges the degree of rechargeable battery degradation; and a threshold control section (20c) that incrementally increases the threshold voltage according to the degree of degradation determined by the degradation appraisal section (20d).
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: May 15, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Atsushi Kawasumi, Toru Nishikawa
  • Patent number: 8098051
    Abstract: A protection circuit for a battery pack, comprising: a thermistor for indicating a temperature of a cell in the battery pack; a first comparator coupled to the thermistor for determining whether the temperature has exceeded a charge cut-off temperature threshold for the cell, and if so, for turning off a first switch in series with the cell to prevent charging of the cell; and, a second comparator coupled to the thermistor for determining whether the temperature has exceeded a discharge cut-off temperature threshold for the cell, and if so, for turning off a second switch in series with the cell to prevent discharging of the cell.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: January 17, 2012
    Assignee: Research In Motion Limited
    Inventors: Siong Litingtun, Jacek S. Idzik
  • Patent number: 7952330
    Abstract: A protection circuit is provided for protecting a secondary battery from overcharging and excessive discharge current by a simple circuit. The protection circuit is provided with a connection terminal (T3) for connecting the secondary battery (6); a connection terminal (T1) for connecting a charging device for charging the secondary battery (6) and/or a load device driven by a discharge current from the secondary battery (6); a bimetal switch (SW1) that is provided between the connection terminals (T1, T3) and turned off in the case of exceeding a specified temperature set beforehand; a heater (R2) for heating the bimetal switch (SW1); and an integrated circuit (IC1) for turning the bimetal switch (SW1) off by causing the heater (R2) to generate heat if a voltage applied to the connection terminal (T3) by the secondary battery (6) exceeds a preset reference voltage.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: May 31, 2011
    Assignee: Panasonic Corporation
    Inventor: Iichiro Mori
  • Patent number: 7940028
    Abstract: A power source comprised of a metal-air battery pack and a non-metal-air battery pack is provided, wherein thermal energy from the metal-air battery pack is used to heat the non-metal-air battery pack. In one aspect, a thermal energy transfer system is provided that controls the flow of thermal energy from the metal-air battery pack to the non-metal-air battery pack. In another aspect, the flow of thermal energy from the metal-air battery pack to the non-metal-air battery pack is controlled and used to heat the non-metal-air battery pack prior to charging the non-metal-air battery pack.
    Type: Grant
    Filed: November 20, 2010
    Date of Patent: May 10, 2011
    Assignee: Tesla Motors, Inc.
    Inventor: Weston Arthur Hermann
  • Patent number: 7872450
    Abstract: A system includes an input configured to connect to a power source providing an input voltage, an output configured to connect to a load and to transfer power from the power source to the load, a battery selectively coupled to the input to receive current from the power source, a detector configured to indicate whether the input voltage drops more than a threshold amount, and a processor configured to regulate the selective coupling of the battery to the input to regulate a charging current supplied to the battery, the processor configured to regulate the selective coupling such that if a first charge current induces a drop in the input voltage beyond the threshold amount, then the processor will change the charging current to a second charge current that is lower than the first charge current.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: January 18, 2011
    Assignee: American Power Conversion Corporation
    Inventors: Daniel C. Cohen, William L. Owens, Franklin Lee, James D. Orlando
  • Patent number: 7808212
    Abstract: A protection circuit for a battery pack, comprising: a thermistor for indicating a temperature of a cell in the battery pack; a first comparator coupled to the thermistor for determining whether the temperature has exceeded a charge cut-off temperature threshold for the cell, and if so, for turning off a first switch in series with the cell to prevent: charging of the cell; and, a second comparator coupled to the thermistor for determining whether the temperature has exceeded a discharge cut-off temperature threshold for the cell, and if so, for turning off a second switch in series with the cell to prevent discharging of the cell.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: October 5, 2010
    Assignee: Research In Motion Limited
    Inventors: Siong Litingtun, Jacek S. Idzik
  • Patent number: 7804278
    Abstract: In one embodiment, a battery management system includes a charger controller for controlling a charging current of a battery according to a status of a load which is powered by the battery, and a counter coupled to the charger controller for determining a charging time according to such status. Advantageously, a first charging current is selected when the load is off. A second charging current that is less than the first charging current is selected when the load is on. Furthermore, a frequency of the counter is set to a first frequency when the load is off. The frequency is set to a second frequency that is less than the first frequency when the load is on.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: September 28, 2010
    Assignee: O2Micro International Ltd.
    Inventors: Stefan Maireanu, Chun Lu, Jianping Xu, Xiaohua Lei, Zhitong Lei, Yongqiang Yu
  • Patent number: 7723955
    Abstract: A system for balancing energy delivery devices within the one or more battery packs and for providing isolated monitoring of the battery packs includes at least one group of energy delivery devices electrically connected in series. For each group of energy delivery devices, the system includes a balancing circuit for each adjacent pair of energy delivery devices. The balancing circuit adjusts charge stored in each energy delivery device of the pair so that the charge stored in the energy delivery devices of the pair is substantially equal, and the charge stored in each energy delivery device remains above a threshold. The system also includes a voltage monitoring module for sequentially selecting each of the energy delivery devices and providing a voltage associated with the selected device at an output port. The voltage monitoring module uses a low on-resistance differential multiplexer to select each of the energy delivery devices.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: May 25, 2010
    Assignee: A123 Systems, Inc.
    Inventors: Nader Zaag, Akos Toth
  • Patent number: 7719238
    Abstract: In a charging/discharging control system for controlling an allowable power level of a secondary battery at the time of charging/discharging operations, excessive discharging or recharging of the secondary battery is prevented, and excessive suppression of the charging/discharging of the secondary battery is prevented. A vehicle ECU controls charging/discharging of the secondary battery in accordance with a predetermined allowable power level. A battery ECU detects an actual loading power level of a secondary battery; calculates a differential power level between the detected actual loading power level and an allowable power level; measures the number of times the calculated differential power level has become equal to or lower than a predetermined threshold value; and downwardly revises the allowable power level when the count has become equal to or greater than a predetermined upper-limit level.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: May 18, 2010
    Assignee: Panasonic EV Energy Co., Ltd.
    Inventors: Takuma Iida, Kouta Togashi, Nobuyasu Morishita
  • Patent number: 7679327
    Abstract: Disclosed are an apparatus and a method for accurately estimating a state of charge of a battery, which can measure a change of temperature and an open circuit voltage so as to estimate the state of charge at an initial time when a vehicle is not driven, and while measuring a decrement in a capacity of a battery according to charging and discharging of the battery when the vehicle is driven. The method includes the steps of: measuring a temperature in an initial estimation of the state of charge; measuring an open circuit voltage; obtaining parameters indicating a change of the open circuit voltage according to a change of temperature; and calculating the state of charge using the parameters and the open circuit voltage which is measured depending on the obtained parameters.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: March 16, 2010
    Assignee: LG Chem, Ltd.
    Inventors: Do Youn Kim, Do Yang Jung
  • Patent number: 7671567
    Abstract: A method and apparatus that allows the end user to optimize the performance of an all-electric or hybrid vehicle and its charging system for a desired mode of operation is provided. The system of the invention includes multiple charging/operational modes from which the user may select. Each charging/operational mode controls the cut-off voltage used during charging and the maintenance temperature of the battery pack.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: March 2, 2010
    Assignee: Tesla Motors, Inc.
    Inventors: Martin Forest Eberhard, Jeffrey Brian Straubel, Kurt Russell Kelty, Scott Ira Kohn, Weston Arthur Hermann, Eugene Michael Berdichevsky, Andrew Gregory Simpson, Craig Bruce Carlson
  • Patent number: 7629773
    Abstract: A method and apparatus that allows the end user to optimize the performance of an all-electric or hybrid vehicle and its charging system for a desired mode of operation is provided. The system of the invention includes multiple charging/operational modes from which the user may select. Each charging/operational mode controls the cut-off voltage used during charging and the maintenance temperature of the battery pack.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: December 8, 2009
    Assignee: Tesla Motors, Inc.
    Inventors: Martin Forest Eberhard, Jeffrey Brian Straubel, Kurt Russell Kelty, Scott Ira Kohn, Weston Arthur Hermann, Eugene Michael Berdichevsky, Andrew Gregory Simpson, Craig Bruce Carlson
  • Patent number: 7629772
    Abstract: A method and apparatus that allows the end user to optimize the performance of an all-electric or hybrid vehicle and its charging system for a desired mode of operation is provided. The system of the invention includes multiple charging/operational modes from which the user may select. Each charging/operational mode controls the cut-off voltage used during charging and the maintenance temperature of the battery pack.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: December 8, 2009
    Assignee: Tesla Motors, Inc.
    Inventors: Martin Forest Eberhard, Jeffrey Brian Straubel, Kurt Russell Kelty, Scott Ira Kohn, Weston Arthur Hermann, Eugene Michael Berdichevsky, Andrew Gregory Simpson, Craig Bruce Carlson
  • Publication number: 20090289604
    Abstract: In a remote battery charging system comprising a charging circuit there is always a voltage loss due to inherent resistances in the system from such things as connectors and conductors. These resistances create voltages losses in the system such that charging times are increased substantially. The present invention compensates for voltage losses on the system by generating a dynamic adjustment voltage over the charging period. A voltage translator circuit is used to measure charging circuit output voltage and current over a plurality of incremental time periods during the charging period an calculate a signal proportional to changes in output voltage and current over the incremental time period. The signal is then applied to the charging circuit to offset any voltage losses.
    Type: Application
    Filed: May 26, 2008
    Publication date: November 26, 2009
    Inventor: STEVE CARKNER
  • Publication number: 20090289603
    Abstract: A method and apparatus for controlling a battery charge. The embodiment may measure the charge level of a battery and determine if the charge level equals or exceeds a threshold. When the battery charge level does not equal or exceed the threshold, the battery may be charged.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Applicant: Apple Inc.
    Inventor: Peter H. Mahowald
  • Patent number: 7615964
    Abstract: A method for charging a secondary battery with a constant current, in which a peak of output voltage is detected by utilizing a predetermined current value, and then the battery continues to be charged with a current value lower than the predetermined current value, so that the peak of output voltage or a voltage drop subsequent to the peak is detected, or alternatively a timer may be used, for termination of the charging operation.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: November 10, 2009
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Tomoya Fukuda
  • Publication number: 20090167246
    Abstract: A battery module for a portable electronic device is disclosed. The battery module is connected with the portable electronic device with at least three contacts. The battery module includes a battery, a recognition circuit, and a thermal sensing circuit. The recognition circuit has an energy storage element and a current limiting element, and the thermal sensing circuit has a switch and a thermal sensing element. The thermal sensing element varies its electric parameter in accordance with the temperature of the battery module. With the charging curve of charging the energy storage element by way of the current limiting element, the portable electronic device can determine a battery type, and the thermal sensing circuit is then initiated to acquire the thermal information of the battery module.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 2, 2009
    Applicant: HTC CORPORATION
    Inventors: Jean-Lieh SHEN, Chih-Chung TENG, Chung-Yi PAN
  • Patent number: 7525288
    Abstract: A charging/discharging apparatus, method and system that receives power from a power supplying apparatus. The method includes a temperature measuring step for measuring an internal temperature of the charging/discharging apparatus. A first transmitting step transmits the internal temperature data of the charging/discharging apparatus to the power supplying apparatus. Charged state information of a battery pack attached to the charging/discharging apparatus is collected and supplied to the power supplying apparatus. A battery pack temperature measuring step measures an internal temperature of the battery pack and a second transmitting step transmits the internal temperature data of the battery pack to the power supplying apparatus.
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: April 28, 2009
    Assignee: Sony Corporation
    Inventors: Kei Tashiro, Hideyuki Sato, Kiyotaka Murata, Toshio Takeshita
  • Patent number: 7429436
    Abstract: In accordance with various embodiments, there is a method for determining the state of charge of a battery. Various embodiments include the steps of determining the specific gravity of the battery and measuring an open circuit voltage of the battery at rest. The open circuit voltage at rest can be used to determine the battery state of charge from a correlation function dependent on the battery specific gravity.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: September 30, 2008
    Assignee: Honeywell International Inc.
    Inventors: Hector M. Atehortua, Steven Hoenig, Thirumalai G. Palanisamy, Harmohan N. Singh
  • Patent number: 7417406
    Abstract: An electronic apparatus which detects when a battery having a different characteristic is mixed in a plurality of batteries accommodated therein. An average voltage V1 per battery of plural batteries connected in series and an average voltage V2 per battery at a connecting point halfway of those connected batteries are detected. A difference in voltage |V1?V2| between the average voltage V1 and average voltage V2 is compared with a tolerable voltage difference ?V. If it is determined that a battery having a different characteristic is mixed, the operation of the apparatus is interrupted and an alarm is displayed or the supply of power is shut down.
    Type: Grant
    Filed: August 23, 2004
    Date of Patent: August 26, 2008
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Takahiro Miwa, Yusuke Ota
  • Publication number: 20080197812
    Abstract: In one embodiment, a battery management system includes a charger controller for controlling a charging current of a battery according to a status of a load which is powered by the battery, and a counter coupled to the charger controller for determining a charging time according to such status. Advantageously, a first charging current is selected when the load is off. A second charging current that is less than the first charging current is selected when the load is on. Furthermore, a frequency of the counter is set to a first frequency when the load is off. The frequency is set to a second frequency that is less than the first frequency when the load is on.
    Type: Application
    Filed: July 25, 2007
    Publication date: August 21, 2008
    Inventors: Stefan Maireanu, Chun Lu, Jianping Xu, Xiaohua Lei, Zhitong Lei, Yongqiang Yu
  • Patent number: 7402982
    Abstract: An energy saving type feeder voltage compensation apparatus improved in availability at low temperatures, wherein when a secondary battery is lower in temperature than a predetermined value, an output voltage output to a feeder side is made equal to or higher than a no-load output voltage of a substation connected in parallel. Power is supplied to a power running rolling stock preferentially from the secondary battery. The heating value of the secondary battery is increased and the battery temperature is raised by this discharging, whereby internal resistance of the secondary battery is lowered, and the charging and discharging loss is suppressed, and the efficiency and availability of the energy saving type feeder voltage compensation apparatus as a whole are improved.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: July 22, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Tomomichi Ito, Tetsuya Kato, Takashi Ikimi
  • Publication number: 20080164849
    Abstract: A battery control module for a rechargeable battery includes a voltage measuring module that measures a voltage of the rechargeable battery and that estimates a first derivative of the voltage with respect to time (dV/dt) and a second derivative of the voltage with respect to time (d2V/dt2). A charge control module estimates a maximum charging current based on dV/dt. A current control module limits a charging current of the rechargeable battery to the maximum charging current and turns off the charging current when d2V/dt2 is greater than dV/dt.
    Type: Application
    Filed: January 9, 2007
    Publication date: July 10, 2008
    Inventor: Christopher M. Ciaramitaro
  • Patent number: 7327122
    Abstract: A battery delivers its rated capacity when the battery is below a temperature when the available battery capacity is limited. The battery includes a heating element, a temperature sensor, and a switch operatively connected to the heating element and temperature sensor and responsive to the temperature sensor for switching on the heating element and raising the temperature of the battery to allow the battery to deliver its rated capacity when a sensed temperature of the battery is below a temperature where available battery capacity is limited.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: February 5, 2008
    Assignee: Mathews Associates, Inc.
    Inventor: Robert Kamenoff
  • Publication number: 20070205746
    Abstract: In a charging/discharging control system for controlling an allowable power level of a secondary battery at the time of charging/discharging operations, excessive discharging or recharging of the secondary battery is prevented, and excessive suppression of the charging/discharging of the secondary battery is prevented. A vehicle ECU controls charging/discharging of the secondary battery in accordance with a predetermined allowable power level. A battery ECU detects an actual loading power level of a secondary battery; calculates a differential power level between the detected actual loading power level and an allowable power level; measures the number of times the calculated differential power level has become equal to or lower than a predetermined threshold value; and downwardly revises the allowable power level when the count has become equal to or greater than a predetermined upper-limit level.
    Type: Application
    Filed: March 1, 2007
    Publication date: September 6, 2007
    Applicant: Panasonic EV Energy Co., Ltd.
    Inventors: Takuma Iida, Kouta Togashi, Nobuyasu Morishita
  • Patent number: 7144646
    Abstract: A fuel cell system determines each of a battery charging current error, a battery voltage error, and a stack current error. The fuel cell system regulates current through a series pass element in response to a greater of the determined errors. Thus, the fuel cell system operates in three modes: battery voltage limiting mode, stack current limiting mode and battery charging current limiting mode. Additionally, there can be a fourth “saturation” mode where the stack voltage VS drops below the battery voltage VB as the load pulls even more current. Individual fuel cell systems can be combined in series and/or parallel to produce a combined fuel cell system having a desired output voltage and current.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: December 5, 2006
    Assignee: Ballard Power Systems Inc.
    Inventor: Martin T. Pearson