Abstract: A BMU, which is a battery management unit, includes a current measuring unit that measures a current charged to and discharged from a battery; a voltage measuring unit that measures a voltage of the battery during measurement of the current by the current measuring unit; a BPF processing unit that extracts a component in a prescribed frequency band, of the current measured by the current measuring unit; a BPF processing unit that extracts a component in the prescribed frequency band, of the voltage measured by the voltage measuring unit; and an impedance calculating unit that calculates an impedance of the battery using the extracted current component and voltage component.

Abstract: A BMU, which is a battery management unit, includes a current measuring unit that measures a current charged to and discharged from a battery; a voltage measuring unit that measures a voltage of the battery during measurement of the current by the current measuring unit; a BPF processing unit that extracts a component in a prescribed frequency band, of the current measured by the current measuring unit; a BPF processing unit that extracts a component in the prescribed frequency band, of the voltage measured by the voltage measuring unit; and an impedance calculating unit that calculates an impedance of the battery using the extracted current component and voltage component.

Abstract: A power supply unit comprises a battery, current and voltage detecting portions, and a remaining capacity computing portion. The remaining capacity computing portion comprises a first computing portion computing a first open circuit terminal voltage based on current and voltage values from the current and voltage detecting portions, and computing a first remaining capacity based on the first open circuit terminal voltage, a second computing portion computing a second open circuit terminal voltage based on the current and voltage values, an ohmic resistance voltage drop and a polarization resistance voltage drop, and computing a second remaining capacity based on the second open circuit terminal voltage, a third computing portion calculating a third remaining capacity based on an integrated value by integrating the current, and a main computing portion computing a real remaining capacity of the battery based on the first and/or third remaining capacity, and the second remaining capacity.

Abstract: A battery system is provided with a plurality of battery units each including a battery module consisting of a plurality of battery cells, a unit control unit, and a connector, and controls the overall operation of the respective battery units in a main control unit. To the plurality of connectors of the battery units, an external unit can be selectively connected so that voltage adjustment for inhibiting voltage variations among the plurality of battery cells or the plurality of battery modules can be realized by using the external unit. The external unit is connected to the battery unit for which voltage adjustment is necessary on the basis of a voltage adjustment necessity determination.

Abstract: A power supply unit comprises a battery, current and voltage detecting portions, and a remaining capacity computing portion. The remaining capacity computing portion comprises a first computing portion computing a first open circuit terminal voltage based on current and voltage values from the current and voltage detecting portions, and computing a first remaining capacity based on the first open circuit terminal voltage, a second computing portion computing a second open circuit terminal voltage based on the current and voltage values, an ohmic resistance voltage drop and a polarization resistance voltage drop, and computing a second remaining capacity based on the second open circuit terminal voltage, a third computing portion calculating a third remaining capacity based on an integrated value by integrating the current, and a main computing portion computing a real remaining capacity of the battery based on the first and/or third remaining capacity, and the second remaining capacity.

Abstract: A battery system is provided with a plurality of battery units each including a battery module consisting of a plurality of battery cells, a unit control unit, and a connector, and controls the overall operation of the respective battery units in a main control unit. To the plurality of connectors of the battery units, an external unit can be selectively connected so that voltage adjustment for inhibiting voltage variations among the plurality of battery cells or the plurality of battery modules can be realized by using the external unit. The external unit is connected to the battery unit for which voltage adjustment is necessary on the basis of a voltage adjustment necessity determination.

Abstract: Each of battery modules is provided with a range determiner and a voltage detector. The range determiner is connected to a battery via a transmission line, and the voltage detector is connected to the battery via a communication line. In the battery, a voltage calculator calculates a terminal voltage of each of battery cells using a determination result of a voltage range of the battery cell by the range determiner. A control value calculator calculates a battery control value using one of a terminal voltage of each of the battery cells detected by the voltage detector and the terminal voltage of the battery cell calculated by the voltage calculator.

Abstract: A battery ECU acquires open circuit voltages of a plurality of battery cells that are divided into a plurality of groups A, B, C using a plurality of detecting units, and calculates SOCs of the battery cells based on the open circuit voltages. Then, the battery ECU selects the group to which the battery cell having the largest SOC among the SOCs of the plurality of battery cells belongs, and selects the battery cell to be discharged in the selected group. A series circuit composed of a resistor and a switching element is connected in parallel with each battery cell. The battery ECU turns on the switching element corresponding to the selected battery cell. At this time, the battery cell is connected to the resistor, thus being discharged.

Abstract: An SOC of each battery cell is periodically detected, and an SOCmin and an SOCmax are determined. Battery cells having the SOCs larger than SOCmin+? are selectively discharged. After an elapse of a preset equalization processing time period, discharge of all the battery cells is stopped. The equalization processing time period is set based on a rate of change in the SOC of the battery cell subjected to discharge and a rate of change in the SOC of the battery cell not subjected to discharge such that a magnitude relationship between the SOC of the battery cell having the SOCmin and the SOC of another battery cell is not reversed.

Abstract: A battery control device is connected to a plurality of battery cells. The battery control device includes a voltage value calculator, a communicator, and a voltage value updater. The voltage value calculator calculates, based on a current flowing through a plurality of battery cells, a voltage of each battery cell. If the battery control device is connected to a charge control device, the communicator receives information relating to a voltage of each battery cell, which has been detected by a voltage detector in the charge control device, from the charge control device. The voltage value updater updates the voltage calculated by the voltage value calculator based on the voltage information received by the communicator.

Abstract: A battery module includes a plurality of battery cells, a detection circuit, a communication unit, and a printed circuit board. The detection circuit and the communication circuit are mounted on the common printed circuit board. The detection circuit detects a voltage of each of the battery cells in the battery module, and feeds the detected voltage to the communication circuit. The communication circuit is connected to a communication circuit in another battery module or a battery ECU. Thus, the communication circuit in the battery module and the communication circuit in the other battery module or the battery ECU can communicate with each other.

Abstract: A state of charge optimizing device according to the present invention optimizes a state of charge of each of a plurality of cells which are connected in series to form an assembled battery, and conducts the optimization by discharging or charging a part or all of the plurality of cells so that the differences between the amount of charge after the optimization and the amount of charge in a predetermined state of charge become uniform.

Abstract: A state of charge optimizing device according to the present invention optimizes a state of charge of each of a plurality of cells which are connected in series to form an assembled battery, and conducts the optimization by discharging or charging a part or all of the plurality of cells so that the differences between the amount of charge after the optimization and the amount of charge in a predetermined state of charge become uniform.

Abstract: An SOC of each battery cell is periodically detected, and an SOCmin and an SOCmax are determined. Battery cells having the SOCs larger than SOCmin+? are selectively discharged. After an elapse of a preset equalization processing time period, discharge of all the battery cells is stopped. The equalization processing time period is set based on a rate of change in the SOC of the battery cell subjected to discharge and a rate of change in the SOC of the battery cell not subjected to discharge such that a magnitude relationship between the SOC of the battery cell having the SOCmin and the SOC of another battery cell is not reversed.

Abstract: A battery ECU acquires open circuit voltages of a plurality of battery cells that are divided into a plurality of groups A, B, C using a plurality of detecting units, and calculates SOCs of the battery cells based on the open circuit voltages. Then, the battery ECU selects the group to which the battery cell having the largest SOC among the SOCs of the plurality of battery cells belongs, and selects the battery cell to be discharged in the selected group. A series circuit composed of a resistor and a switching element is connected in parallel with each battery cell. The battery ECU turns on the switching element corresponding to the selected battery cell. At this time, the battery cell is connected to the resistor, thus being discharged.

Abstract: In a casing, battery blocks are positioned so that a distance between a printed circuit board attached to an end surface of each of the battery blocks and an end surface opposed to the printed circuit board is greater than a distance between the end surface of the battery block, to which no printed circuit board is attached, and an end surface of the casing, which is opposed to the end surface of the battery block.

Abstract: A state-of-charge equalizing device equalizes the state of charge of each of cells connected in series to form an assembled battery, and comprises charging/discharging circuits connected in parallel to the respective cells to discharge and/or charge the respective cells, voltage measurement circuits connected to the respective charging/discharging circuits to measure the voltages across the respective cells, and a control circuit.

Abstract: A device that equalizes state of charge of each of a plurality of cells connected in series which form an assembled battery includes a control circuit and a discharge circuit for discharging each cell. The control circuit includes a unit that derives, for each cell to be discharged having a state of charge evaluation value different from an equalization target value, a discharge time or discharge end value with which the state of charge of a cell to be discharged becomes equal to that of a cell not to be discharged, and a unit that starts the discharge by the discharge circuit 21 for the cell to be discharged, and thereafter ends the discharge by the discharge circuit for each cell to be discharged when the derived discharge time has elapsed or when the state of charge evaluation value reaches the derived discharge end value.

Abstract: A state-of-charge equalizing device equalizes the state of charge of each of cells connected in series to form an assembled battery, and comprises charging/discharging circuits connected in parallel to the respective cells to discharge and/or charge the respective cells, voltage measurement circuits connected to the respective charging/discharging circuits to measure the voltages across the respective cells, and a control circuit.

Abstract: A state of charge optimizing device according to the present invention optimizes a state of charge of each of a plurality of cells which are connected in series to form an assembled battery, and conducts the optimization by discharging or charging a part or all of the plurality of cells so that the differences between the amount of charge after the optimization and the amount of charge in a predetermined state of charge become uniform.