| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary cell group capable of charging and discharging a DC battery with high efficiency and attaining long life. SOLUTION: Charging is continued while the other cells are being suppressed until a cell having the smallest capacity has reached prescribed charging voltage. When the cell having the smallest capacity has reached the prescribed charging voltage, the charging of the other cells is restarted, and, when the cell having the smallest capacity has reached upper-limit voltage, it is switched to current control. |
