Abstract: Some embodiments provide a system that determines a battery chemistry for a battery in a peripheral device. During operation, the system determines a first voltage of the battery at a first time and a second voltage of the battery at a second time. The first voltage and the second voltage are then compared to one or more predetermined battery usage profiles to determine the battery chemistry.

Abstract: A no-load detecting circuit and the method thereof are disclosed. The no-load detecting circuit may be applied in switching mode power supplies or other circuits. The no-load detecting circuit comprises: a variable resistance circuit coupled in series to a load of the switching mode power supply; and a first comparison circuit coupled to the variable resistance circuit to receive the voltage across the variable resistance circuit, wherein based on the comparison of the voltage across the variable resistance circuit and a first threshold, the first comparison circuit generates a no-load detecting signal indicative of the load status; wherein the equivalent resistance of the variable resistance circuit varies based on the varying of the load of the switching mode power supply.

Abstract: The disclosure provides a method for transmitting data between a control device and at least one measurement device via a bus system. The method includes recording first measurement data relating to at least one measurement variable with the at least one measurement device with a first measurement data resolution within a first measurement cycle, transmitting the recorded first measurement data to the bus system at a first measurement frequency within the first measurement cycle. The method further includes recording second measurement data relating to the at least one measurement variable with the at least one measurement device with a second measurement data resolution within a second measurement cycle. The second measurement data resolution is less than the first measurement data resolution. The method also includes transmitting the recorded second measurement data to the bus system at a second measurement frequency within the second measurement cycle.

Abstract: A method for detecting SOC and SOH of a storage battery includes: calculating an SOC value of the storage battery with use of an SOC calculation unit based on a measured voltage value or a measured current value of the storage battery and calculating an SOH value of the storage battery with use of an SOH calculation unit based on the SOC value; further calculating a new SOC value with use of the SOC calculation unit based on the SOH value and calculating a new SOH value with use of the SOH calculation unit based on the new SOC value, these further calculations of SOC value and SOH value being repeated a prescribed n times of at least one so as to obtain an nth calculated SOC value and an nth calculated SOH value; outputting the nth calculated SOH value as an SOH output value and outputting the nth calculated SOH value as an SOC output value; and storing the SOH output value into a memory.

Abstract: An idling stop device installed in a vehicle includes a microcomputer, a detector, a storage, and a controller. The microcomputer automatically stops an engine of the vehicle when a prescribed stopping condition is satisfied, and automatically activates a starter motor of the engine when a prescribed activating condition is satisfied. The detector detects whether a drive voltage of the microcomputer, which is obtained by dropping a voltage of a battery of the vehicle is less than a threshold value. The storage stores, irrespective of a state of the microcomputer, information indicating that the detector has detected that the drive voltage is less than the threshold value. The controller drops an increasing speed of a current for driving the starter motor when the microcomputer activates the stator motor under the condition that the information is stored in the storage.

Abstract: A method is provided for current-based detection of an electrical fault in an electrical network of a motor vehicle, the network having at least: one battery, one pulse-controlled inverter, one d.c. voltage converter, and an intermediate circuit associated with the pulse-controlled inverter. The method includes: detecting magnitudes of each a battery current, a d.c. voltage converter current, and an intermediate circuit current; comparing current magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded. An alternative method for voltage-based detection of an electrical fault in an electrical network of a motor vehicle includes: detecting magnitudes of each a battery voltage, a d.c. voltage converter voltage, and an intermediate circuit voltage; comparing voltage magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded.

Abstract: The battery state-of-charge calculation device (100) is provided with a SOCV calculation unit (5) which outputs a first state of charge calculated based on voltage data, a SOCI calculation unit (6) which outputs a second state of charge calculated based on current data, an estimated impedance voltage calculation unit (12) which calculates an impedance voltage value based on an effective state of charge and the current data, a static determination unit (7) which determines that the impedance voltage value remains static for a predetermined time or longer in a range identified by a predetermined threshold value and outputs the determination result; and a SOC decision unit (20) which, based on the determination result, outputs the first state of charge as the effective state of charge where the impedance voltage value is static and outputs the second state of charge as the effective state of charge where the impedance voltage value is not static.

Abstract: An apparatus for calculating a residual capacity of a secondary battery is provided. The apparatus calculates the residual capacity of energy in the secondary battery which is charged/discharged. The apparatus includes an arithmetic unit which estimates and calculates a first residual capacity based on a charge/discharge voltage corresponding to a residual capacity of the secondary battery, calculates a second residual capacity based on an integrated value of a charge/discharge current of the secondary battery, weights the charge/discharge voltage of the secondary battery with the first residual capacity or the second residual capacity according to the voltage changing rate, and combines the results of the weighting to obtain the residual capacity of the secondary battery.

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.

Abstract: A voltage measurement device, includes: a multiplexer that includes a plurality of input terminals at which voltage signals are inputted; a control circuit that performs voltage measurement by acquiring the voltage signal at a selected input terminal from the multiplexer; and a decision circuit that makes a decision as to whether or not an abnormality has occurred, based upon voltage values measured by the control circuit, wherein: the plurality of input terminals include input terminals at which voltage signals from a plurality of subjects of measurement are inputted, and an input terminal at which a potential for diagnosis is inputted; the control circuit, when performing voltage measurement for the plurality of subjects of measurement, measures voltages at the input terminals at which the voltage signals from the plurality of subjects of measurement are inputted, and a voltage at the input terminal at which the potential for diagnosis is inputted.

Abstract: Provided are a battery state monitoring circuit and a battery device, in which, even when one secondary battery becomes an overcharged state or an overdischarged state and then a voltage detection circuit operates, power is not consumed in only the one secondary battery. The battery state monitoring circuit includes: a plurality of voltage detection circuits which are provided for a plurality of secondary batteries, respectively, for detecting voltages of the plurality of secondary batteries; and a current bypass circuit provided in each of the plurality of voltage detection circuits, for allowing an operation current of the each of the plurality of voltage detection circuits to flow into a ground terminal. Therefore, when only one secondary battery becomes an overcharged state or an overdischarged state, the battery device operates so that the power of all the secondary batteries is consumed to prevent voltages between the secondary batteries from being unbalanced.

Abstract: A busbar for battery electrode post connection with a terminal for voltage detection is provided. Both ends of a length direction of a rectangular thin plate of a conductive metal are left and an elongated opening is formed in a center. Two holes through which an electrode post of one battery and an electrode post of an adjacent battery are inserted are respectively formed in the rectangular thin plates of both sides around the elongated opening of the center. A terminal for voltage detection is extended integrally to the rectangular thin plate from an edge of the rectangular thin plate. The two holes overlap in a state of where the rectangular thin plate is folded in two with respect to the elongated opening. The terminal for voltage detection can be erected from the rectangular thin plate by folding the terminal for voltage detection in a vertical direction.

Abstract: A battery monitor determines an internal resistance of a battery cell of a battery having parallel connected battery strings which accounts for errors introduced by the parallel connected battery strings. When determining the internal resistance of a battery cell, the battery monitor determines a baseline intercell resistance of an intercell connecting the negative terminal of the battery cell to the positive terminal of an adjacent battery. The battery monitor then applies a momentary load across the battery cell and immediately prior to releasing the load, measures the voltage across the battery cell (loaded voltage) and the voltage across the intercell. The battery monitor then calculates the current flowing through the intercell (intercell current) by dividing the measured voltage across the intercell by the determined intercell resistance.

Abstract: A load testing machines includes: six resistance units; six cooling fans; insulators between the resistance units and the cooling fans; and connection cables, in which: each of the resistance units includes a plurality of steps of resistor groups arranged in a z-direction and each formed of a plurality of rod-shaped resistors parallel to a x-direction connected together in series arranged at predetermined intervals in a y-direction; the six cooling fans face the resistance units, respectively, in the z-direction; the connection cables are cables used for serially and detachably connecting resistor groups next to each other in the y-direction of two resistance units next to each other in the y-direction with an interval of not smaller than a second distance in between; and the insulators each have a size corresponding to the rated voltage of a target power supply of a power supply load test to be conducted using a resistance unit group.

Abstract: The invention relates to an evaluation circuit for detecting the voltage in battery cells of a battery system which are preferably connected in series. The evaluation circuit includes serially connected resistors, the number of which is equal to the number of battery cells for which the voltage is to be detected. One of the resistors is associated with each of the battery cells.

Abstract: A load system includes a power supply input unit for load test of an external power supply, a charging circuit or a charger to which electric power from the power supply is supplied via the power supply input unit, a plurality of loads to which the electric power from the charging circuit or the charger is supplied, and a control circuit that switches selectively and connects the plurality of loads to the charging circuit or the charger. The plurality of loads is a plurality of storage batteries as a load resistance. The control circuit is configured to switch selectively and connect the plurality of storage batteries to the charging circuit or the charger such that the storage battery connected to the charging circuit or the charger among the plurality of storage batteries is charged by the charging circuit or the charger.

Abstract: A battery pack is provided. The battery pack includes first battery cells, a second battery cell coupled to one of the first battery cells, a voltage sensing and balancing circuit for measuring voltages of the first battery cells and for maintaining voltage balance between the first battery cells, a controller that includes an analog-to-digital (A/D) converter, and an analog switch for measuring a voltage value of the second battery cell and for transferring the measured voltage value to the A/D converter. The controller is for controlling charging and discharging of the first and second battery cells. The analog switch includes a flying capacitor, a first switch unit for transferring a voltage between the second battery cell and the flying capacitor, a second switch unit for transferring a voltage of the flying capacitor to the A/D converter, and a first diode for protecting a voltage source from a surge current.

Abstract: Provided is an insulation resistance measuring circuit including: a source resistor unit including a first source resistor connected between a positive terminal of a battery and a second source resistor and the second source resistor connected between a negative terminal of the battery and the first source resistor; a voltage sensing unit sensing a voltage of the first source resistor as a first voltage and sensing a voltage of the second source resistor as a second voltage; and an insulation resistance measuring unit measuring an insulation resistance of the battery through a value obtained by dividing a difference between the first and second voltages by a sum between the first and second voltages.

Abstract: A battery remaining amount detection unit includes: a voltage measurement section configured to measure a voltage of a battery; an open-circuit voltage calculation section configured to calculate an estimated open-circuit voltage; and a remaining amount detection section configured to detect a remaining amount of the battery from the estimated open-circuit voltage, in which the open-circuit voltage calculation section is configured to calculate a first voltage change amount as a voltage change amount from a no-load voltage when no load is applied to the battery and a closed-circuit voltage when a load is applied to the battery, and the open-circuit calculation section is configured to calculate the estimated open-circuit voltage based on the closed-circuit voltage of the battery and the first voltage change amount.

Abstract: An accumulator control device includes a first electrical connection configured to connect the accumulator control device to a local accumulator. A second electrical connection is connected to the first electrical connection and configured to connect to a remote auxiliary electrical power supply device. A control unit is configured to measure at least one of a parameter of the accumulator and an environmental parameter and to transmit at least one of the at least one measured parameter and a value calculated using the at least one measured parameter to the remote auxiliary electrical power supply device via a communication interface.

Abstract: A full charge capacity correction circuit including: an integrating unit that calculates an integrated current value; a capacity storing unit that stores a full charge capacity value; a first estimating unit that estimates a storage ratio, which is a ratio of a quantity of stored electricity to an actual full charge capacity, as a first storage ratio; a second estimating unit that estimates a storage ratio; a full charge capacity correction unit that estimates a new full charge capacity value, and stores the estimated new full charge capacity value; an open circuit ratio estimating unit that uses a condition in which the rechargeable battery is in an open circuit state, and estimates the storage ratio based on a terminal voltage of the rechargeable battery; and a correction control unit that uses the open circuit ratio estimating unit as the first estimating unit or the second estimating unit.

Abstract: The invention provides a power supply system for a data storage system, the power supply system comprising: a first power supply unit for supplying power to the storage system; a second power supply unit independent from the first power supply unit for supplying power to the storage system; an auxiliary power supply; a power redundancy controller, arranged to monitor the region of an efficiency curve within which the first and/or second power supplies are operating in and control the first and second power supplies accordingly such that the either or both of the first and second power supplies are providing power at any one time, wherein in the event of failure of a power supply unit when only one of the power supply units is operating, the power redundancy controller is arranged to provide power supply to the data storage system from the auxiliary power supply.

Abstract: A method that includes affixing a radio frequency identification tag on a storage battery at a battery manufacturing plant. The method also includes storing battery manufacturing information into the radio frequency identification tag at the battery manufacturing plant. The battery manufacturing information includes a battery algorithm suitable for use in testing the storage battery.

Abstract: An alarm for detecting radiation and/or pollutants such as smoke, carbon monoxide or the like, the alarm comprises: an alarm circuit (12) including detection means (14) for detecting the radiation and/or pollutants, and an audible alarm (16); a power supply circuit (24) connectable to an external AC power supply for supplying standby power to the alarm circuit (12); and a battery (20) for supplying power to the audible alarm (16) when the alarm is energized. The power supply circuit (20) is configured to supply current to the alarm circuit (12) at a level less than that required to energize the audible alarm (16).

Abstract: A power supply system comprises a chargeable power storage device; a charging device configured to perform external charging for charging the power storage device using alternating-current power supplied from an external power supply; an air conditioner receiving electric power from the charging device and the power storage device and air-conditioning a compartment in a vehicle; an auxiliary machinery load; and an ECU. The ECU controls at least one of the charging device and the auxiliary machinery load so as to increase the electric power output from the power storage device in a case where overcharging of the power storage device is expected when the air conditioner is intermittently operated during external charging.

Abstract: Disclosed is an apparatus and method for estimating a state of charge (SOC) in a battery, the apparatus including a detector unit; a soft computing unit for calculating and outputting a battery SOC estimation value by processing a current, a voltage and a temperature detected by the detector unit using a computing algorithm, which is a fuzzy algorithm implemented as a neural network, the soft computing unit storing the battery SOC estimation value in a memory, where the fuzzy algorithm has a form expressed as F=?(P,X)W, where ? is one of a fuzzy radial function, a radial basis function, and an activation function in the neural network, P is a learning parameter, X is an input, and W is a weight to be updated during learning.

Abstract: A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an “i”th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the “i”th cell and an (i?1)th cell, which is in one location higher than the “i”th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the “i”th cell with the voltage value of the “i”th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery.

Abstract: A detecting device and a detecting method for monitoring a battery module are provided. The battery module is electrically connected to a load and includes a first battery unit, a second battery unit and a connecting device. The connecting device connects the positive electrode of the first battery unit to the negative electrode of the second battery unit. The detecting device includes a shunt, a voltage detecting module and a control module. The shunt is serial connected between the battery module and the load to measures the load current. The voltage detecting module measures the voltage difference across the connecting device between the positive electrode and the negative electrode. The control module computes the equivalent resistance across the connecting device between the positive electrode and the negative electrode according to the load current and the voltage difference.

Abstract: A battery monitoring system utilizes a plurality of transformers interconnected with a battery having a plurality of battery cells. Windings of the transformers are driven with an excitation waveform whereupon signals are responsively detected, which indicate a health of the battery. In one embodiment, excitation windings and sense windings are separately provided for the plurality of transformers such that the excitation waveform is applied to the excitation windings and the signals are detected on the sense windings. In one embodiment, the number of sense windings and/or excitation windings is varied to permit location of underperforming battery cells utilizing a peak voltage detector.

Abstract: The present invention generally relates to a thermal battery testing apparatus and a method for testing a thermal battery. The method includes one or more of the following steps: connecting the thermal battery in series with a resistance; connecting the thermal battery and resistance in series with a sinusoidal voltage source; applying a sinusoidal voltage to the thermal battery, measuring an impedance, reactance and/or capacitance across two terminals of the thermal battery, comparing the measured impedance, reactance and/or capacitance to a reference impedance, reactance and/or capacitance; and indicating whether the tested thermal battery is “in family” or “out of family.” The battery testing apparatus may include a testing device configured to apply a sinusoidal voltage to the thermal battery and to measure the impedance, reactance and/or capacitance across two terminals of the thermal battery. The testing apparatus may further be configured to report “out of family” batteries.

Abstract: In accordance with certain embodiments of the present disclosure, an energy harvesting system is provided. The system comprises a coil wound about a generally cylindrical shaped magnetic core having a first end and a second end. The coil includes wires that are wound in such a manner that the wires are generally parallel to the cylindrical shaped magnetic core axis. The cylindrical shaped magnetic core defines a core gap that extends parallel to the magnetic core axis. The cylindrical shaped magnetic core also defines an opening extending therethrough from the first end to the second end such that the cylindrical shaped magnetic core is configured to fit around current carrying conductor.

Abstract: A high-voltage transformer for providing an alternating voltage in the kV range, comprising at least one secondary winding wound on a coil carrying body surrounding a transformer core, and an insulation housing encapsulating the secondary winding is provided to electrically insulate the secondary winding. Said insulation housing is walled by the coil carrying body carrying the secondary winding and by an enveloping body made of plastic and enveloping the secondary winding so that an annular gap is formed, wherein the annular gap between the secondary winding and the enveloping body is filled with an insulating fluid. The annular gap has a gap width of less than or equal to 20 mm viewed in the cross-section, and the enveloping body has a wall thickness of less than or equal to 20 mm, wherein the plastic is polypropylene, and a separate expansion volume is not provided for the insulating fluid.

Abstract: A battery cell tab monitoring apparatus includes a conductive element electrically connected between two battery cells. The conductive element is connected to a sensing circuit including a pull-down current source connected to pull current from the conductive element and/or a pull-up current source connected to drive current into the conductive element. A voltage measuring circuit is connected to sense voltages during operation of the pull-down current source and the pull-up current source to be used to determine the status of the conductive element. For instance, voltages beyond certain fixed or variable thresholds indicate that the conductive element is flexing or cracking, which can be a precursor to its breaking. Voltages beyond other fixed or variable thresholds indicate that the conductive element is fully disconnected. The current sources used to push and pull the sensing currents may be used to bring the battery cells into balance when an imbalance is detected.

Abstract: An over-voltage detection and correction system for a transmitter of a mobile terminal that accounts for battery droop during a transmit burst is provided. In general, prior to ramp-up for a first transmit burst, a voltage of the battery of the mobile terminal at a no-load condition is measured. After ramp-up for the transmit burst, the voltage of the battery is measured at full-load, and a current provided to a power amplifier of the transmitter at full-load is detected. Based on the measured voltage of the battery at no-load, the measured voltage of the battery at full-load, and the detected current provided to the power amplifier at full-load, a resistance of the battery is determined. The resistance of the battery is thereafter used to compensate for battery droop during over-voltage detection and correction for one or more subsequent transmit bursts.

Abstract: Systems and methods for monitoring a voltage pump to determine the status of a battery connected to the voltage pump are provided. The operation of the voltage pump is monitored during at least one monitoring period which corresponds to a period of relatively heavy consistent load. The operation of the voltage pump can be monitored by sampling a control signal that corresponds to the operation of the voltage pump.

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.

Abstract: An invention is provided for determining a state of health of a battery. The invention includes applying a predefined load profile to a battery, and obtaining a plurality of battery response voltage data corresponding to points along the predefined load profile. The battery electrical double layer capacity data is calculated from the battery response voltage data, and thereafter utilized to determine the state of health of the battery.

Abstract: An apparatus for sensing a leakage current of a battery comprises a floating capacitor charged with voltage detected from a cathode or anode terminal of a battery, a cathode terminal selection switching unit for selecting a voltage detection path for the cathode terminal and charging the floating capacitor with a detection voltage of the cathode terminal, an anode terminal selection switching unit for selecting a voltage detection path for the anode terminal and charging the floating capacitor with a detection voltage of the anode terminal, a DC voltage applying unit for applying DC voltage through the voltage detection path for the anode terminal, a voltage measuring unit for measuring the charged detection voltage of the cathode or anode terminal, and a leakage current determining unit for determining the occurrence of leakage current based on the measured detection voltages of the cathode and anode terminals.

Abstract: One particular implementation conforming to aspects of the present invention takes the form of a method for detecting the end of life of a battery for an electronic device. The method may include calculating the voltage of the battery in an unloaded state, holding the sampled unloaded battery voltage, measuring a loaded battery voltage, calculating the difference between the unloaded and loaded battery voltages and amplifying the calculated difference. Other implementations may take the form of a circuit to perform one or more of the operations of the above method. The circuit may include a sample and hold section and a differential amplifier to provide the amplified difference to a microcontroller for analysis. The microcontroller may also provide a warning or indication to the device or to a user of the device when the battery nears the end of life.

Abstract: A method of testing a battery including several steps described herein is provided.

Abstract: A battery gas gauge includes a voltage detection unit and a processor. The voltage detection unit is coupled to a battery pack and can measure a plurality of open circuit voltages of a plurality of cells in the battery pack respectively. The processor is coupled to the voltage detection unit and can determine a minimum open circuit voltage of the open circuit voltages, and can determine a first relative state of charge of the battery pack based on a relationship between the minimum open circuit voltage and a corresponding relative state of charge of a cell having the minimum open circuit voltage. The processor can further determine a capacity level of the battery pack based on the first relative state of charge and a rated full capacity level of the battery pack.

Abstract: An apparatus for measuring a battery cell voltage includes a battery having a cell group; a first switching unit for selectively connecting both terminals of each battery cell of the cell group to conductive lines; a first voltage charging unit connected between the conductive lines to primarily charge a cell voltage; a second voltage charging unit for relaying the charged voltage in the first voltage charging unit for secondary charging; a cell voltage sensing unit for sensing the voltage charged in the second voltage charging unit; and a second switching unit for interconnecting the voltage charging units in the charged voltage relaying mode and isolating the voltage charging units in the charged voltage sensing mode. This apparatus realizes isolation between a high voltage battery and a voltage sensing unit, thereby allowing voltage sensing of each battery cell included in a high voltage battery using a part with low withstanding voltage.

Abstract: A method that includes affixing a radio frequency identification tag on a storage battery at a battery manufacturing plant. The method also includes storing battery manufacturing information into the radio frequency identification tag at the battery manufacturing plant. The battery manufacturing information includes a battery algorithm suitable for use in testing the storage battery.

Abstract: A monitoring apparatus includes a first converter that converts first analog data indicating a voltage value of each of batteries into first digital data; and a second converter that converts second analog data indicating an electric current value flowing through the plurality of batteries into second digital data. The first analog data and the second analog data are data having the same timing.

Abstract: A battery internal short-circuit detection apparatus includes: a voltage detection unit for detecting a terminal voltage of the battery; a current detection unit for detecting a discharging current of the battery; a voltage drop and recovery detection unit for detecting a momentary voltage drop of the battery and a recovery from the voltage drop, in response to a result of detection performed by the voltage detection unit; and a determination unit for determining that an internal short circuit has occurred, when a maximum value of the discharging current detected by the current detection unit between the voltage drop and the recovery is equal to or lower than a threshold current.

Abstract: A battery voltage monitoring apparatus monitoring an assembled battery voltage, the assembled battery including a plurality of battery cells, includes a voltage sensor detecting potential of the plurality of battery cells; an output logic circuit outputting a potential detect signal based on an output of the voltage sensor, the potential detect signal representing that abnormal potential is detected; and a delay circuit adding certain delay to the output of the voltage sensor and outputting the delayed voltage detect signal to the output logic circuit; wherein, the voltage sensor comprises at least one comparator having hysteresis characteristic, and detects the potential of the battery cell based on an output of the comparator.

Abstract: To provide a technology for obtaining a remaining capacity of a battery with high accuracy.

Abstract: According to the present invention, a power supply control device for an electric power steering device used for a power supply system comprises a main battery 40 connected to the electric power steering device via a first power supply line and a sub-battery 50 connected to the electric power steering device via a second power supply line, wherein when detecting the state of the sub-battery, said power supply control device restricts or disconnects power supply from the main battery to the electric power steering device while it permits power supply from the sub-battery to the electric power steering device, characterized in that said power supply control device prevents the detection of the state of the second battery if a vehicle speed is higher than a predetermined reference value.

Abstract: A method and a charger for auxiliarily charging a secondary battery to a desired SOC with high accuracy. A charger for a secondary battery includes a charge termination condition storing unit which stores a relationship between open circuit voltages OCV of a plurality of secondary batteries and an amount of change of terminal voltage ?V until a desired state of charge SOC is reached, which is previously created. A target terminal voltage Vmap at the time of the auxiliary charge is calculated by adding the amount of change of terminal voltage ?V corresponding to the open circuit voltage OCV of a secondary battery to be auxiliarily charged to the open circuit voltage OCV which is measured. A terminal voltage Vb of the secondary battery at the time of auxiliary charge and the target terminal voltage Vmap are compared to each other by a comparison unit, and when the target terminal voltage Vmap is reached, auxiliary charge is terminated.

Abstract: A battery module voltage detector can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The battery module voltage detector includes a plurality of switches connected to battery modules constituting a battery pack, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the battery pack. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the battery pack. Capacitors may be connected between an output terminal of a (1+M/2)-th resistor and an N-th resistor, except a (1+m/2), the (1+M/2)-th resistor and the N-th resistor.