| 摘要 |
A battery pack arranged to make a judgment concerning a loss of functional status and to perform selectively charge-and-discharge control and forced discharge control according to the judgment. The battery pack includes a charge-and-discharge control device for charging and discharging a battery, a forced discharge control device for forcedly discharging each cell, a function detecting device for detecting a functional status of the battery pack, a judging device for making a judgment concerning a loss of functional status detected by the function detecting device, and a control device for selectively controlling the charge-and-discharge control device and the forced discharge control device according to the judgment concerning a loss of functional status made by the judging device. A battery pack having lost its function owing to the completion of the span of life and a marked degradation in function is judged to be one having lost its functional status, and charge-and-discharge control and forced discharge control are selectively performed according to the judgment.
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