| 摘要 |
PURPOSE: To provide a battery cap unit which prevents degradation of accuracy of a protection unit by using a heat sensitive switch as one and can constitute a compact, fit for assembly, and low-cost battery by integrating and unitizing the protection unit with a battery cap body. CONSTITUTION: The unit is provided with a metal battery cap body 2 sealing a battery cell 1 used for a secondary battery and shielding the inside of the cell, and a heat sensitive switch 4 making changeover of switching at a given temperature, and it is so structured that the heat sensitive switch 4 is fitted to the battery cap body 2 and the heat sensitive switch 4 and the battery cap body 2 are integrated, to aim at unitization.
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