| 摘要 |
<p>According to one of the embodiment, an assembled battery has a plurality of cells (11(1)-11(x)) electrically connected in series. A charge amount difference detection circuit (70) detects charge amount difference of the cells. Wherein, while a charging or discharge current is being applied to the cells, the charge amount difference detection circuit detects charge amount differences greater than a charge amount of a reference cell having a minimum charge amount, the charge amount differences of the cells are determined by addition of the charging or discharge currents during a period corresponding to the time differences between the reference cell and the other cells reaching a predetermined specific voltage, discharge switches are controlled by a switch controller, based on the charging amount differences.
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