| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack temperature protecting circuit, capable of attaining size and weight reduction in a battery pack without causing cost increase in the assembling work. SOLUTION: A serial resistor circuit, formed by serial-connecting a resistor element 21A having a prescribed resistance value with a thermistor 21B, is parallel-connected with a battery 1 (BATT), and a switching circuit constituted of an FET21C is serially connected with the battery 1. An electric potential V1, obtained by voltage-dividing the voltage V of the batter 1 through the resistor element 21A and the thermistor 21B, is supplied to the gate of the FET21C. When ambient temperature changes, the resistance value of the thermistor 21B is changed, and the electric potential V1 obtained by voltage-dividing the voltage V of the battery 1 through the resistor element 21A and the thermistor 21B changes. As a result, the FET21C is in a cut-off condition, so that a current route of the battery 1 to the outside is shut down.
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