| 摘要 |
PROBLEM TO BE SOLVED: To realize charging/discharging operation of each of single cells of a secondary battery, consisting of a plurality of batteries connected in series within the prescribed voltage range, without increasing the number of power sources. SOLUTION: Voltage of a single cell or a block of a plurality of cells of a secondary battery connected in serial is detected during the charging operation, and when a voltage of a single cells or any one of the cell block becomes higher than a prescribed upper limit value, a constant current charging operation is charged to a constant voltage charging operation. When the voltage of single cell or any one of the cell block becomes lower than a prescribed lower limit value during the discharging operation, a constant-current discharging operation is changed to a constant-voltage discharging operation. |
