| 摘要 |
The objective is to address the problem wherein variation in the capacity and internal resistance of each battery cell forming a battery pack continues to increase. Therefore, in the present invention the voltage of each battery cell 11, 12 is set to a value V4 determined using the formula V4 = V2 + k(V3−V2), where V2 is the secondary voltage, V3 is the individual voltage of each battery cell 11, 12, and k is a constant. When the constant k is a negative value, the correspondence relationship between the capacity and voltage V4 of each secondary cell 11, 12 is inverted, the voltage of the secondary cell 12 having the relatively smaller battery capacity is lower, and the voltage of the secondary cell 11 having the relatively larger battery capacity is higher. In this case, the variation in the battery capacity can be reduced. |
