BATTERY PACK PROTECTING CIRCUIT AND BATTERY PACK

摘要

There are provided a first switch element (34a) for interrupting the discharging current following in a battery cell (31) and a second switch element (34b) for interrupting the charging current. A positive character thermistor (Rcpb) is inserted between a gate control terminal (Dout,Cout) of a protection control circuit (33) and the gate of at least one of the switch elements (34a,34b), while a resistor (R1b) is connected between the gate and source of that switch element. The positive character thermistor (Rcpb) is thermally coupled to the first and second switch elements (34a,34b) or to the battery cell (31). In this way, an extraordinary excessive heating state of the switch elements (34a,34b) or battery cell (31) causes a rise in the resistance of the positive character thermistor (Rcpb), which then places the switch element (34b) in an interruption state to activate a protection function.