| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack comprising two or more unit batteries connected in series, or two or more parallel battery groups, each of which including two or more unit batteries connected in parallel with one another, connected in series, capable of reducing the differences in charged electrical amount among the respective unit batteries or the respective parallel battery groups to thereby improve the charge-discharge cycle life, even after long-term use or standing. SOLUTION: Equalizing the drop amount per hour of charge-discharge cycle life among the respective unit battery or the respective parallel battery groups enables to reduce the differences in charged electrical amount among the respective unit battery or the respective parallel battery groups to thereby improve the charge-discharge cycle life, even after long-term use or standing. COPYRIGHT: (C)2009,JPO&INPIT
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