| 摘要 |
PROBLEM TO BE SOLVED: To suppress unbalance in capacity between power storage elements.SOLUTION: The present invention relates to a BM 50 of a battery pack 30 having a plurality of power storage elements 31 connected in series, and comprising a voltage detection part 80 which detects voltages of the respective power storage elements 31 individually, a charging/discharging circuit 70 which discharges or charges the respective power storage elements 31 individually, and a control part 60. The power storage element 31 has two low variation regions L1, L2 where a rate of variation in open voltage to a charging state is relatively low, and a first high variation region H1 where a rate of variation in open voltage to the charging state is relatively high between the two low variation regions L1, L2, and when the two power storage elements 31A, 31B are separated into the two low variation regions L1, L2, the control part 60 performs first equalization processing of discharging or charging at least one side between the two power storage elements 31A, 31B based upon a capacity difference Ccd across the first high variation region H1 so as to make small the difference in capacity between the two power storage elements 31A, 31B.SELECTED DRAWING: Figure 6 |
