| 摘要 |
PROBLEM TO BE SOLVED: To reliably prevent all secondary batteries from being over charged and discharged and to charge/discharge an assembly battery, by forcibly charging or discharging the assembly battery so that the total charged/discharged capacity being operated and integrated during a first period approaches a specific value in a second specific period after the first specific period. SOLUTION: A capacity integration means for integrating the capacity of an assembly battery 2 adds a capacity being calculated when charging the assembly battery 2 and subtracts the calculated capacity when discharging the assembly battery 2 based on an operation result by a capacity operation means for calculating the charged capacity and discharged capacity of a capacity operation means for calculating the charged capacity and the discharged capacity of the assembly battery 2 by multiplying a charge current or a discharge current by a specific amount of time. Then, by integrating the charge current and discharge current at each specific time, the charged capacity and the discharged capacity are calculated. Then, the assembly battery 2 is forcibly charged or discharged so that the total with the charged/discharged capacity being integrated in the first specific period approaches 0 during a second specific period after the first specific period.
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