BATTERY PACK SYSTEM AND MANAGEMENT METHOD OF BATTERY PACK SYSTEM

摘要

PROBLEM TO BE SOLVED: To readily determine degradation and abnormality of a battery pack formed by serially connecting a number of secondary batteries.SOLUTION: A battery pack system repeatedly sets a charge period in which a charge current is supplied and a charge suspension period in which the supply is stopped, for a single battery pack 3 formed by serially connecting a number of cells 2. The battery pack system includes a battery management unit 6 which monitors voltages of the cells 2 and the single battery pack 3, and a control unit 7 which determines abnormality of the cells 2 on the basis of voltages VC of the cells 2 in the charge period or the voltages VC of the cells 2 in the charge suspension period, and then stops the supply of the charge current to the single battery pack 3 including the cells 2.