| 摘要 |
A battery pack includes a protection circuit which detects overcharge, over-discharge, and overcurrent of a secondary battery and turns OFF a switch element arranged on a line between the secondary battery and a load or a charge device. The battery pack further includes: a series circuit of a thermistor and resistor arranged in the vicinity of the secondary battery and connected in parallel to the secondary battery; a connection detection circuit which detects a connection of a charge device; a comparator arranged in the protection circuit for comparing a voltage at a connection point between the thermistor and the resistor to a reference voltage corresponding to a predetermined temperature; and a gate circuit arranged in the protection circuit for enabling the output signal of the comparator only when the connection of the charge device is detected by the connection detection means. The protection circuit turns OFF the switch element when the temperature of the secondary battery exceeds the predetermined temperature according to the output signal of the comparator from the gate circuit. |
