Patent ID: 8524385
Filing Date: 2013-09-03
Classification: H01M,H02J,Y02E

Abstract:
1. A battery pack comprising: a secondary battery; first and second switch devices provided in wiring provided between the secondary battery and a load or a charging unit; a protection circuit configured to detect an overcharge, an overdischarge or an overcurrent of the secondary battery and configured to control turning on and off of the first and second switch devices; a series circuit of a first resistor and a thermistor disposed in the vicinity of the secondary battery and connected in parallel with the secondary battery; a comparator provided inside the protection circuit configured to compare a voltage at a connection point between the thermistor and the first resistor with a reference voltage corresponding to a predetermined temperature and output a high temperature detection signal indicating a temperature of the thermistor exceeds the predetermined temperature; an insensitive time setting circuit configured to receive the high temperature detection signal from the comparator and output the high temperature detection signal when the high temperature detection signal continues to be at a high level for a predetermined period or more and a third switch device connected between the first resistor and a negative electrode of the secondary battery, wherein the protection circuit is configured to turn off each of the first switch device and the third switch device when an overdischarge of the secondary battery is detected.