State of charge equalizing device and assembled battery system including same
First Claim
1. A state of charge equalizing device equalizing the state of charge of each cell of a plurality of cells connected to each other in series to form an assembled battery, comprising:
- a plurality of charging/discharging circuits connected in parallel to the respective cells to discharge and/or charge the respective cells;
a plurality of voltage measurement circuits connected to the respective charging/discharging circuits to measure the voltages across the respective cells; and
a control circuit controlling an operation of each of the charging/discharging circuits based on the measurement result of each of the voltage measurement circuits,the control circuit comprising;
an equalization target voltage calculating unit calculating an equalization target voltage based on the voltages measured by the plurality of voltage measurement circuits before the plurality of charging/discharging circuits start discharging or charging;
a charging/discharging starting unit that starts discharging or charging the cells each having a voltage thereacross different from the equalization target voltage calculated by the equalization target voltage calculating unit, by means of the respective charging/discharging circuits;
a correcting unit correcting the equalization target voltage to thereby calculate a corrected equalization target voltage for each of said cells based on the difference between the voltage measured by the voltage measurement circuit before the charging/discharging circuit starts discharging or charging the cell and the voltage measured by the voltage measurement circuit after a certain period of time elapses from when the charging/discharging circuit starts discharging or charging the cell; and
a discharging or charging ending unit that ends the discharge or charge of each of said cells by the charging/discharging circuit when the voltage measured by the voltage measurement circuit reaches the corrected equalization target voltage calculated by the correcting unit.
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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. The control circuit comprises a unit calculating an equalization target voltage based on the measured voltages before the charge or discharge starts, a unit starting discharging/charging the cells having a voltage thereacross different from the target voltage, a unit correcting the target voltage to thereby calculate a corrected equalization target voltage for each of those cells based on the difference between the measured voltages before and at a certain time period after the charging/discharging, and a unit ending the discharging/charging when the measured voltage reaches the corrected target voltage.
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Citations
5 Claims
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1. A state of charge equalizing device equalizing the state of charge of each cell of a plurality of cells connected to each other in series to form an assembled battery, comprising:
- a plurality of charging/discharging circuits connected in parallel to the respective cells to discharge and/or charge the respective cells;
a plurality of voltage measurement circuits connected to the respective charging/discharging circuits to measure the voltages across the respective cells; and
a control circuit controlling an operation of each of the charging/discharging circuits based on the measurement result of each of the voltage measurement circuits,the control circuit comprising; an equalization target voltage calculating unit calculating an equalization target voltage based on the voltages measured by the plurality of voltage measurement circuits before the plurality of charging/discharging circuits start discharging or charging; a charging/discharging starting unit that starts discharging or charging the cells each having a voltage thereacross different from the equalization target voltage calculated by the equalization target voltage calculating unit, by means of the respective charging/discharging circuits; a correcting unit correcting the equalization target voltage to thereby calculate a corrected equalization target voltage for each of said cells based on the difference between the voltage measured by the voltage measurement circuit before the charging/discharging circuit starts discharging or charging the cell and the voltage measured by the voltage measurement circuit after a certain period of time elapses from when the charging/discharging circuit starts discharging or charging the cell; and a discharging or charging ending unit that ends the discharge or charge of each of said cells by the charging/discharging circuit when the voltage measured by the voltage measurement circuit reaches the corrected equalization target voltage calculated by the correcting unit. - View Dependent Claims (2, 3, 4, 5)
- a plurality of charging/discharging circuits connected in parallel to the respective cells to discharge and/or charge the respective cells;
Specification