| 摘要 |
PROBLEM TO BE SOLVED: To provide a protection circuit for a secondary cell that detects temperature increase by overvoltage charging for effectively decreasing a charge current, and at the same time keep the charge current being decreased for safely protecting the secondary cell even if the temperature of the cell falls. SOLUTION: A resistance heating element 5 is connected to the series circuit of a secondary cell 1 and a PTC element 3 in parallel, at the same time, the secondary cell 1 thermally comes into contact with the PTC element 3, and, furthermore, the PTC element 3 thermally comes into contact with the resistance heating element 5.
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