| 摘要 |
PROBLEM TO BE SOLVED: To provide a protective element and a battery pack, capable of surely preventing the charging and discharging by an excessive current, the charging or the like through an excessive voltage by applying the protective element in the battery pack, using, for example a lithium ion secondary battery cell, a lithium polymer secondary battery cell or the like. SOLUTION: A temperature fuse 4 is fused by the heating of a PTC element 5, or these elements are integrated to constitute a protective element, and the protective element is arranged on the charging and discharging path of the battery pack.
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