| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of charging a battery pack, which suppresses a sharp decrease in a cycle life that happens when four or more serial batteries are connected in parallel and charged together by n-stage constant current charging for capacity increase, and offers both advantages of fine life characteristics and short-time charging. Ž<P>SOLUTION: According to the method of charging the battery pack, serial circuits each composed of a plurality of lead storage batteries connected in series are connected in parallel to supply power to a load. A charging device is connected to each serial circuit to carry out n-stage constant current charging in such a way that the charging device detects a charge voltage for the serial circuit to lower a charge current value step by step in n stages (n denotes an integer satisfying n≥2) when the charge voltage reaches a predetermined control voltage value. When the battery pack supplies power to the load, at least four or more of the serial circuits are connected in parallel in the battery pack. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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