| 摘要 |
PROBLEM TO BE SOLVED: To provide a protection circuit for protecting a secondary battery against overcharge or an excessive large discharge current by a simple circuit. SOLUTION: The protection circuit of a secondary battery comprises a connection terminal T3 for connecting a secondary battery 6, a connection terminal T1 for connecting a charger charging the secondary battery 6 and/or a load apparatus driven by a discharge current from the secondary battery 6, a bimetal switch SW1 provided between the connection terminals T1 and T3 to be turned off when a preset temperature is exceeded, a heater R2 for heating the bimetal switch SW1, and an integrated circuit IC1 for turning the bimetal switch SW1 off by heating the heater R2 when a voltage applied to the connection terminal T3 from the secondary battery 6 exceeds a preset reference voltage. COPYRIGHT: (C)2007,JPO&INPIT |
