| 摘要 |
A battery pack that has a configuration in which a plurality of secondary battery cells are connected in series at time of discharge and are connected in parallel at time of charge, and that has a configuration and a structure with which the charge and the discharge are allowed to be performed without any trouble even if an abnormal-state secondary battery cell exists is provided. A battery pack 10 includes a plurality of secondary battery cells 21 and a control circuit 11. Under control of the control circuit 11, the plurality of secondary battery cells 21 are connected in series at time of discharge, and are connected in parallel at time of charge. The control circuit 11 measures voltages of the respective secondary battery cells 21 before the charge, and in a state that a secondary battery cell 21 having a value of measured voltage equal to or less than a predetermined value as an abnormal-state secondary battery cell is electrically disconnected from other secondary battery cells 21 in the plurality of secondary battery cells 21, the control circuit 11 connects the other secondary battery cells 21 in parallel and charges the other secondary battery cells 21.
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