Abstract: A battery abnormality detection circuit includes: a SOC detection unit that detects a SOC of a secondary battery; an internal resistance detection unit that detects an internal resistance value of the secondary battery; a first state acquisition unit that acquires a first SOC and a first resistance value at a predetermined first timing; a second state acquisition unit that acquires a second SOC and a second resistance value at a second timing a storage unit that stores in advance relationship information indicating a correspondence relationship between a SOC and an internal resistance value of the secondary battery; a reference variation value setting unit that sets a reference variation value indicating an amount of variation from an internal resistance value corresponding to the first SOC to an internal resistance value corresponding to the second SOC on the basis of the relationship information stored in the storage unit; and a determination unit that determines that an abnormality has occurred in the seco

Abstract: Electrical systems, power supply apparatuses, and power supply operational methods are described.

Abstract: A battery life predicting device and a battery life predicting method capable of accurately predict the lifetime of storage batteries are provided.

Abstract: Battery system is widely used in emergent power plant or communication network power plant and its effective management is important. When any one of batteries connected to each other in series is failed during operation of the battery system, since reliability of the system cannot be secured, a problem is arisen to stable operation of the communication network. In a method of separating inferior battery, the battery is operated in floating charge state without separation to generate square current containing charge current and easily generated to flow through the battery cell, voltage signal generated from terminal voltage of the battery by the measuring signal is processed such that only internal impedance voltage signal is separated from harmonics ripple voltage and noise voltage by a synchronized detection calculating algorithm to calculate the internal impedance or effective value thereof (resistance component).

Abstract: The present invention is related to a multi-function remote control which is supplied power by a rechargeable battery. The multi-function remote control comprises a micro controller unit (MCU), a residual power display, a button unit, a current detector and a voltage detector. The MCU couples to the rechargeable battery and then charges or discharges the rechargeable battery. The current detector measures the current of the rechargeable battery and correspondingly outputs a current-value signal (Si) to the MCU. The voltage detector measures the voltage of the rechargeable battery and correspondingly outputs a voltage-value signal (Sv) to the MCU. Then, the MCU obtains the residual power of the rechargeable battery by means of analyzing the current-value signal (Si) and voltage-value signal (Sv), and then reveals the corresponding residual power by the residual power display. Whereby, the multi-function remote control might have functions of remote control, charging and revealing residual power.

Abstract: A battery pack includes a voltage detection part configured to detect the voltage of a battery unit including multiple chargeable and dischargeable secondary cells; a current detection part configured to detect a current flowing through the battery unit; a dischargeable capacity calculation part configured to calculate the dischargeable capacity of the battery unit based on the current detected by the current detection part; and a capacity correction part configured to correct the remaining capacity of the battery unit, the remaining capacity including the dischargeable capacity calculated by the dischargeable capacity calculation part, wherein the capacity correction part is configured to correct the remaining capacity based on an estimated dischargeable capacity calculated from the relationship between a preset predetermined voltage and the drop rate of the voltage of the battery unit, in response to the voltage of the battery unit becoming less than or equal to a predetermined threshold.

Abstract: The present invention provides a battery module state detection method. The battery module includes a battery unit and is connected to a load. The method for detecting the battery module status includes the following steps. First, measure an on-load voltage value of the battery unit and a load current value of a load. Next, calculate an instant resistance value of the battery unit according to a no-load voltage value of the battery unit, the on-load voltage value and the load current value. Finally, obtain an operating state of the battery unit according to the instant resistance and a relationship between the internal resistance and discharging time. By the method of the present invention, the user can monitor the remaining energy of the battery module accurately in real time and therefore prevent the electrical hazard caused by over-discharging the battery module.

Abstract: A battery analysis interface enables measurement of a performance of an internal battery while the battery powers an electronic device. The battery analysis interface is configured to connect an analysis device to the battery located within a battery compartment of the electronic device and enclosed by a battery cover. In this way, the battery analysis interface may enable testing of the battery's performance while the electronic device is fully assembled (i.e., the battery cover is secured to electronic device). The battery analysis interface may be connected to directly to terminals on the battery and/or electronic device or connected to the terminals via wires or strips of conductive material.

Abstract: A method for estimating vehicle battery parameters that uses two different sampling rates. The method samples a battery terminal voltage and current at a high sampling rate to estimate the battery open circuit voltage and high frequency resistance. The battery state of charge (SOC) is derived from the open circuit voltage. Next, the battery terminal voltage and current are re-sampled at a low sampling rate. Other battery parameters can be extracted from the low-rate sampled signals. Next, all of the battery parameters that were obtained from the two sampling rates are used together to predict battery power.

Abstract: The electrical vehicle energy storage system permits the electric refueling of the electric vehicle just like an automobile would be refueled with gasoline at a gas station. Circuitry on board the vehicle accessible by the electric refueling station enables the determination of the energy content of the battery module or modules returned to the electric refueling station and the owner of the vehicle is given credit for the energy remaining in the battery module or modules which have been exchanged. Selective refueling may take place for given battery modules by removing them from the battery system and charging them at home, office or factory. A process for operating an electric vehicle is also disclosed and claimed.

Abstract: The evaluation method of a separator for a nonaqueous electrolyte battery according to the present invention includes: placing opposite an upper jig 21 serving also as a conductive electrode and a lower jig 23 serving also as a conductive electrode in both sides of the separator sample 22; and measuring the relationship between an applied voltage and a passed current between the upper jig 21 and the lower jig 23 while applying a pressure to between the upper jig 21 and the lower jig 23 to evaluate the separator. At this time, by fitting a foreign material 28 in any shape between the separator sample 22 and one of the upper jig 21 and the lower jig 23, an evaluation of the separator simulating the presence of a foreign material affecting adversely the separator can be performed.

Abstract: A vehicle battery product and a battery monitoring system communicating with a battery product having an at least one electronics module, the module having a controller, the controller having software and a computer readable storage media. An at least one sensor circuit senses the status of the battery product including a battery product voltage and a battery product temperature. Software modules in the battery monitoring system acquire battery product data such as the battery product voltage and the battery product temperature, filter the acquired battery product data into modified battery product data and process the modified battery product data against stored parameters through a lookup function on a variable event filter table resulting in an output that represents the state of charge or state of health of the battery. The acquired, filtered, modified and compared battery product data is stored to provide historical battery product data over the course of the life of the battery product.

Abstract: A power supply device includes a battery 1, positive and negative-side contactors 3A and 3B, and a controller 10. The battery 1 supplies power to a load 20. The positive-side contactor 3A is serially connected to the positive side of the battery 1. The negative-side contactor 3B is serially connected to the negative side of the battery 1. The controller 10 determines whether the load 20 connected to the output sides of the positive-side contactor 3A and the negative-side contactor 3B is in a connected or non-contact state. The controller 10 includes a voltage detecting circuit 12 that detects the capacitor voltage of a capacitor 21 connected to the output sides of the positive-side contactor 3A and the negative-side contactor 3B, and a determination circuit 13 that compares the detected voltage with a predetermined voltage and determines the connected state of the load 20.

Abstract: An apparatus for managing a battery pack for a vehicle includes a temperature measurement module for measuring temperature of the battery pack; a current measurement module for measuring a charge/discharge current of the battery pack when the measured temperature is not within a predetermined temperature range; a time measurement module for measuring the time while the measured charge/discharge current is over a predetermined current value; a storage module for accumulating and storing the measured time; and a control module for determining a state of the battery pack according to the accumulated and stored time and providing the state information to a user.

Abstract: A method for accurately estimating battery capacity based on a weighting function is provided. The disclosed system monitors battery current and uses the monitored battery current to calculate the state of charge (SOCbyAh) of the battery. The system also measures the open circuit voltage (OCV) of the battery when the system is at rest, rest being determined by achieving a current of less than a preset current value for a period of time greater than a preset time period. The state of charge of the battery is calculated from the OCV (SOCbyOCV). The weighting function is based on ?SOCbyAh and ?SOCbyOCV, where ?SOCbyAh is equal to SOCbyAhFirst time minus SOCbyAhSecond time, and where ?SOCbyOCV is equal to SOCbyOCVFirst time minus SOCbyOCVSecond time. The weighting function also takes into account the errors associated with determining SOCbyAh and SOCbyOCV.

Abstract: Reactive replenishable device management comprises receiving device measurement data from at least one device, updating one or more device usage profiles associated with the at least one device, and if an analysis of the one or more device usage profiles indicates usage of the at least one device is sub-optimal, performing one or more of: controlling at least one of an attribute or an operation of the at least one device, issuing one or more device management recommendations to a user of the at least one device, and issuing one or more user alerts to the user. The at least one device comprises at least one of one or more replenishable devices, one or more replenishers associated with the one or more replenishable devices, and one or more other devices associated with the one or more replenishable devices.

Abstract: In a method for determining the state of charge of an electrical accumulator, individual cell voltages are recorded, and the highest and/or the lowest individual cell voltage is ascertained. A present maximum charge and/or a present minimum charge of the appertaining accumulator cell is determined using a characteristic curve and the highest and/or the lowest individual cell voltage.

Abstract: A method and apparatus is used to confirm the charge amount and degradation state of a battery. Various cycle test battery measurements are conducted at prescribed time intervals until the end of the battery life, and the measured values are used to generate a determination table or determination tables showing relationships between battery charge amount and degradation state. To establish the charge amount and degradation state of a subject battery, the subject battery is measured and the results compared with determination table values. The existing charge amount and the state of battery degradation are estimated in accordance with a determination table location of matching values.

Abstract: An electronic apparatus has a multiplicity of display units including an electronic viewfinder and a liquid crystal display (LCD) panel. The apparatus has various display modes. The remaining battery power, i.e., estimated amounts of remaining battery times relative to a current remaining battery capacity, are calculated for the respective display modes. The calculated remaining battery power is collectively displayed as the remaining battery power information on the respective display units. The remaining battery power can be obtained for all the display modes even when the battery is being charged, so that a user can always grasp the remaining battery power of any of the display modes.

Abstract: The remaining capacity of a battery may be monitored with a microprocessor by integrating a voltage measured across a current sense resistor coupled in series with the battery. The microprocessor may measure electrons passing through the battery by sampling the integrator and summing the values recorded from the integrator. Each time the integrator is sampled, the microprocessor may reset the integrator to prevent the integrator from saturating. The remaining capacity of the battery may be calculated based on calibration values and the sum of electrons measured by the integrator. The remaining capacity may be communicating to remote users through a network and displayed in an executive dashboard.

Abstract: An apparatus for estimating state-of-health (SOH) of a battery is disclosed, which comprises: a measurement unit, for measuring a working current, a working voltage and a working temperature of the battery; an observer unit, for observing voltages at an output end and RC parallel circuits of the battery; an adaptive algorithm unit, for updating parameters of the battery; an internal voltage estimation unit, for estimating the internal voltages of the RC parallel circuits; an open-circuit voltage (OCV) estimation unit, for estimating static open-circuit voltage of the battery; a SOH estimation unit, for estimating an SOH of the battery; and a state-of-charge (SOC) estimation unit, for estimating a SOC of the battery.

Abstract: A system and method for maximizing a battery pack total energy metric indicative of a total energy of a battery pack is provided. The method includes receiving battery cell charge capacity estimates for all cells in the battery pack, composing battery pack configurations comprising subsets of the totality of battery cells, evaluating a battery pack energy metric for every battery pack configuration that is composed, selecting the battery pack configuration that has the maximum battery pack energy metric, and storing values indicative of the selected battery pack configuration in a memory.

Abstract: A portable device for displaying charge information has a transmission unit for wirelessly transmitting a signal, requesting charge information on a battery, to a controller provided with a unit for detecting a remaining amount of a battery, a reception unit for wirelessly receiving the charge information from the controller, a storage unit for storing charge information received by the reception unit, a display unit for displaying charge information stored into the storage unit, and a charge prediction information calculating unit for calculating prediction information regarding a state-of-charge of the battery based upon charge information stored in the storage unit in the case of the reception unit being unable to receive charge information from the controller after transmitting a signal requesting charge information from the transmission unit. The prediction information calculated by the charge prediction information calculating unit is displayed in the display unit.

Abstract: The electrical vehicle energy storage system permits the electric refueling of the electric vehicle just like an automobile would be refueled with gasoline at a gas station. Circuitry on board the vehicle accessible by the electric refueling station enables the determination of the energy content of the battery module or modules returned to the electric refueling station and the owner of the vehicle is given credit for the energy remaining in the battery module or modules which have been exchanged. Selective refueling may take place for given battery modules by removing them from the battery system and charging them at home, office or factory. A process for operating an electric vehicle is also disclosed and claimed.

Abstract: This invention relates to a mobile electronic device and a power management method of a battery module thereof. The mobile electronic device includes a battery module, a charging/discharging module, and a control module. The charging/discharging module is coupled with the battery module. The control module is coupled with the battery module and the charging/discharging module. When the power supply is coupled with the mobile electronic device and the system time is not within a maintenance period, the control module controls the charging/discharging module to maintain capacity of the battery module within a first capacity range. When the power supply is coupled with the mobile electronic device and the system time is within the maintenance period, the control module controls the charging/discharging module to maintain the capacity of the battery module within a second capacity range.

Abstract: A battery status detection device for detecting the status of a secondary battery 200 supplying power to a mobile device 300 includes a voltage detection unit 20 detecting voltages of the secondary battery 200; a current detection unit 30 detecting charge/discharge currents of the secondary battery 200; an arithmetic processing unit 50 calculating an internal resistance value of the secondary battery 200 based on a voltage difference between the voltages detected by the voltage detection unit 20 before and after the start of charging the secondary battery 200 and a current difference between the charge/discharge currents detected by the current detection unit 30 before and after the start of charging the secondary battery 200 and determining whether the secondary battery 200 is degraded based on the calculated internal resistance value; and a communication processing unit 70 outputting a signal indicating the determination result of the arithmetic processing unit 50.

Abstract: A method to manage charge and/or discharge of a rechargeable battery comprising at least one electrochemical cell having predetermined maximum continuous charge current (IMR_C) and/or discharge current (IMD_C) allowed, the method comprising the steps of: measuring an instantaneous charge current (I); defining an overcharge capacity (Cap); determining an instantaneous maximum current allowed in charge (IMR) as a function of the overcharge capacity; and/or defining an over thermal capacity (CapTh); determining an instantaneous maximum pulse current allowed in discharge (IMD_max) as a function of the over thermal capacity.

Abstract: A sensor arrangement and method that may be used with a variety of different energy storage devices, including battery packs found in hybrid vehicles, battery electric vehicles, and other types of vehicles. An exemplary sensor arrangement includes a number of sensor units, a controller, and several connections, wherein two or more sensor units are coupled to each node of the battery pack and are coupled to the controller over different connections. An exemplary method is divided into two aspects: an error detection aspect and an error resolution aspect. Because the sensor arrangement provides multiple sensor readings for each node being evaluated, the method can enable the sensor arrangement to continue operating accurately and with redundancy even if it experiences a loss of one or more sensor units.

Abstract: Improvements both in the methods whereby existing techniques for determining the condition of a battery are communicated to a user (for example, to the owner of a private vehicle, or to the service manager of a fleet of vehicles), or the vehicle's operating system, and in the methods for evaluating the condition of the battery are disclosed. It has been discovered by the inventors that the difference in internal resistance of a fully charged battery as measured during charging and as measured after charging is greater for a battery in poor condition than for a new battery. The invention relates in part to instruments and corresponding methods for evaluating the condition of a battery utilizing this discovery.

Abstract: A cable for connecting to an electronic battery tester, includes a first end configured to couple to a databus of a vehicle and a second end configured to couple to the electronic battery tester. An electrical connection extends between the first end and the second end and is configured to couple the electronic battery tester to the databus of the vehicle.

Abstract: A battery control device 1 has an electric circuit control unit 6 controlling a power supply; a voltage measuring unit 7 measuring a voltage; a current measuring unit 8 measuring an electric current; and a power source control unit 9, wherein the power source control unit 9 measures a first voltage defined as the voltage of the battery 4 and a first current defined as the current of the battery 4 in a state where the battery 4 supplies electric power to the load 3, measures a second voltage defined as the voltage of the battery 4 in a state where the supply of the electric power to the load 3 from the battery 4 is cut off, and calculates internal impedance of the battery 4 by dividing a value, obtained in a way that subtracts the first voltage from the second voltage, by the first current.

Abstract: A system includes a solar power subsystem that receives power from one or more solar power arrays. A storage control subsystem is coupled to the solar power subsystem to charge a battery from the power received by the solar power subsystem. A grid power control subsystem having an AC to DC converter receives power from a power grid and provides DC voltage to the storage control subsystem. A balance of system control system controls the amount of power received from the power grid as a function of a load, battery charge and received power by the solar power subsystem. The solar array and battery may be sized to provide sufficient power under normal operating conditions, with power being drawn from the grid during abnormal operation conditions.

Abstract: In control apparatus and method for a power supply equipped in an automotive vehicle, the vehicle includes an engine, a starter to start the engine, a battery to reserve the electrical power supplied to the starter, and a generator driven by means of the engine to generate the electrical power to charge the battery, a terminal voltage of the battery is detected in a form of a battery voltage, a charge current flowing into the battery by means of the generator is detected, and a degree of deterioration of the battery is determined on the basis of at least one of the battery voltage detected after the power supply is turned on and before a start of operation of the generator and the charge current detected after the start of operation of the generator.

Abstract: The method includes the simultaneous measurement of the current I, of the positive plate potential V+, and of the temperature T at the positive terminal of the battery, the determination of a temperature compensated value Vc+ of the positive plate potential and the use of the temperature compensated value Vc+ for estimation of the state of charge. This method is more particularly used for estimation of the state of charge of an alkaline battery having a NiOOH positive plate.

Abstract: The present invention can speedily and accurately estimate an SOC of a secondary battery immediately after a charge/discharge operation resumes. A determination unit determines whether a dormant period is longer than a predetermined time in response to an initiation of power supply from a secondary battery to a motor generator. The dormant period is equivalent to the duration from a previous stop of power supply to a present initiation of power supply. If the dormant period is longer than the predetermined time, a state-of-charge estimating unit sets an initial SOC based on a peak battery voltage drop ?Vs and a peak discharge current Is, wherein the peak battery voltage drop ?Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply.

Abstract: A method of battery capacity measurement is actualized by battery internal resistance. This method establishes a controlled discharge path inside the battery module. The battery discharge current is a constant value despite of the variation of system loading current. The internal resistance measured by establishing this constant battery current can be used to obtain the battery capacity precisely.

Abstract: The resistors R1 and R2 are applied to terminals 1 and 8, respectively, of the switched-mode power supply 26. These resistors R1 and R2 are current-limiting resistors and function to control the output power and current. A standard buck regulator may be coupled to terminal 5 of the switched-mode power supply 26. The buck regulator includes a diode D7 and an inductor L1. The diode D7 and inductor L1 provide DC rectification and filtering of the high-frequency switch voltage from the switched-mode power supply 26.

Abstract: Provided is a secondary battery system which can accurately detect a state of a secondary battery system (such as a secondary battery state and a secondary battery system failure). The secondary battery system (6) includes dV/dQ calculation means which calculates a dV/dQ value as a ratio of a change amount dV of a battery voltage V of a secondary battery (100) against a change amount dQ of an accumulation amount Q when the accumulation amount Q of the secondary battery (100) is changed. The secondary battery system (6) detects the state of the secondary battery system (6) by using the dV/dQ value.

Abstract: The invention provides a system and battery including a state-of-charge indicator (SOCI) to monitor and display the amount of charge within the battery. The SOCI is capable of operating in a hibernate mode, an active mode, and/or a sleep mode. The battery may be manufactured, shipped and/or stored with the SOCI operating in a power-saving hibernate mode. The SOCI may exit the hibernate mode and begin operating in active mode if a physical key connected to the battery is removed. In addition, the SOCI may operate in a sleep mode while the battery is not being used to conserve power. Furthermore, the invention provides a method of making a battery including a SOCI to monitor and display the state of charge of the battery.

Abstract: Embodiments of the present invention provide a monitoring system that may include a plurality of monitors. Each may have a plurality of input pairs coupled to respective components of a component stack, wherein adjacent monitors each have an input pair coupled to a common component. Embodiments of the present invention provide an integrated circuit that may include a plurality of detectors to locally measure a first group of channels. The integrated circuit may also include a receiver operable to receive a measurement of at least one channel of the first group of channels, and a controller to calculate a correction factor based on the received measurement and a local measurement of the at least one channel and to correct all first group measurements with the correction factor.

Abstract: The state-of-charge adjusting apparatus which enables to shorten a time to reach a capacity equalization is provided. A CPU extracts a block consisting of a plurality of unit cells connected continuously to each other, the plurality of the unit cells each having a voltage higher than a target voltage, and connects both ends of each block to a discharge resistance to make each block discharge. Thereafter, the CPU extracts a unit cell having a voltage higher than the target voltage and connects both ends of the extracted unit cell to the discharge resistance to make the extracted unit cell discharge until the voltage of the extracted unit cell reaches the target voltage.

Abstract: A method and device for safety protection of a secondary battery capable of preventing smoking and ignition thereof. A lithium cell 1 as a chargeable and dischargeable secondary battery, a protection circuit 11 for shutting down charging power Pc at the time of overcurrent, overvoltage, etc., and an electric power restriction circuit 20 for limiting the charging power Pc input to the lithium cell 1 are incorporated into a battery pack 10. A battery charger 12, equipped with a stabilized electric source 13 and a charging circuit 14, inputting the charging power Pc to the lithium cell 1, is connected to a previous stage of the battery pack 10. The electric power restriction circuit 20 limits the charging power Pc within a boundary value Pmax of a safety operation region for safely using the lithium cell 1, thereby permitting the lithium cell 1 to operate safely under any conditions.

Abstract: Methods and systems for estimating remaining life of an automotive propulsion battery are provided. A total usable capacity of the battery is calculated based on cycling the battery. A first component of degradation is calculated based on driving throughput of the battery. A second component of degradation is calculated based on aging of the battery. The total degradation is calculated based on the sum of the first component and the second component of degradation.

Abstract: A system and method for use with a vehicle battery pack having a number of individual battery cells, such as a lithium-ion battery commonly used in hybrid electric vehicles. In one embodiment, the method evaluates individual battery cells within a vehicle battery pack in order to obtain accurate estimates regarding their average transient voltage effect, open circuit voltage (OCVCell) and/or state of charge (SOCCell) so that a cell balancing process can be performed. These cell evaluations may be performed fairly soon after the vehicle is turned off and in a manner that utilizes a minimal amount of in-vehicle resources.

Abstract: A method for controlling regeneration of a battery includes determining a scaled value for a state of charge of the battery, a scaled value for a battery temperature and a scaled value for a maximum charging power of the battery. An actual battery temperature is then compared with a predetermined operating temperature. When the actual battery temperature is less than the predetermined operating temperature, an actual regeneration amount is calculated based upon the scaled value for the state of charge of the battery and the scaled value for the battery temperature. When the actual battery temperature is greater than the predetermined operating temperature, the actual regeneration amount is based upon the scaled value for the state of charge of the battery, the scaled value for the battery temperature, and the scaled value for the maximum charging power of the battery.

Abstract: A mobile terminal includes a fuel accommodation section that accommodates a fuel within a body, at least one face of the fuel accommodation section being formed by a transparent or translucent member, a fuel cell section that generates electricity on the basis of the fuel accommodated in the fuel accommodation section, a body orientation detection section that detects an orientation of the body, a storage section that stores scale display information concerning a plurality of orientations of the fuel accommodation section, a display section disposed on the face of the fuel accommodation section formed by the transparent or translucent member, and a control section that obtains the scale display information corresponding to the orientation detected by the body orientation detection section from the scale display information stored in the storage section, and displays the obtained scale display information on the display section.

Abstract: Computer algorithms design to execute on a computer system embedded inside a starter or deep cycle battery that calculate optimal charge rates and detect internal alarm conditions and make this information externally available.

Abstract: This invention is related to a method and an apparatus for choosing SOCi (State Of Charge based on current) or SOCv (State Of Charge based on voltage) as the SOC (State Of Charge) of a battery depending on a condition in a battery management system by using an equivalent circuit model. In this invention, a method for measuring SOC of a battery in a battery management system is characterized by comprising the steps of: obtaining voltage data and temperature by measuring the current, voltage and temperature of a battery; calculating SOCi by accumulating the current data; calculating open circuit voltage by using an equivalent circuit model which simply presents the current data, the voltage data and the battery through an electric circuit; calculating SOCv by using the temperature data and the open circuit voltage; and choosing at least one of the SOCi and the SOCv as SOC of the battery by using the SOCi and the SOCv based on the judgment on the current state of a vehicle for a certain time interval.

Abstract: According to an embodiment of this invention, a method for measuring SOC (State Of Charge) of a battery comprises the steps of: obtaining current data, voltage data and temperature by measuring the current, the voltage and the temperature of a battery; calculating SOCi (State Of Charge based on current) by accumulating the current data; calculating open circuit voltage by using an equivalent circuit model which simply presents the current data, the voltage data and the battery through an electric circuit; calculating SOCv (State Of Charge based on voltage) by using the temperature data and the open circuit voltage; and choosing at least one of the SOCi and the SOCv as SOC of the battery by using the SOCi and the SOCv based on the judgment on the current state of the battery for a certain time interval.

Abstract: A camera includes: a battery unit on which a battery is mounted, that can be detachably loaded into the camera and supplies power to the camera; and a function unit that executes camera functions, wherein: as a function of the camera is executed, the function unit transmits information related to the executed function to the battery pack; and the battery unit has a storage unit in which the information related to the camera function is stored.