| 摘要 |
PROBLEM TO BE SOLVED: To reduce costs, and to miniaturize a device for adjusting remaining capacity for each unit cell of a battery pack where a plurality of unit cells that can be charged and discharged are connected in series. SOLUTION: When a timer 24 is actuated, an MPU 18 calculates the variance of the SOC of each unit cell. When a unit cell 14 where the variance of the SOC exceeds the tolerance of variance exists, the unit cell 14 is discharged. The cancellation of the variance of the SOC of each unit cell 14 is not limited a case when a battery pack 12 is charged. The unit cell 14 can be continuously discharged regardless of the charge of the battery pack 12, thus eliminating the need for increasing a discharge current when the unit cell 14 is discharged and hence eliminating the need for allowing a resistor 19a and a switch 19b in a unit cell discharge circuit 19 for discharging to cope with a large current, preventing the calorific value from being increased in the case of discharge, preventing cooling structure from being enlarged and added, and hence reducing costs and miniaturizing a device. |
