Patent ID: 7808212

Claim:
A protection circuit for a battery pack, comprising: a thermistor for indicating a temperature of a cell in the battery pack; a first comparator coupled to the thermistor for determining whether the temperature has exceeded a charge cut-off temperature threshold for the cell, and if so, for turning off a first switch in series with the cell to prevent charging of the cell, wherein the first comparator is directly coupled to the first switch to affect control thereof; a second comparator coupled to the thermistor for determining whether the temperature has exceeded a discharge cut-off temperature threshold for the cell, and if so, for turning off a second switch in series with the cell to prevent discharging of the cell, wherein the second comparator is directly coupled to the second switch to affect control thereof; and, first and second resistors coupled to the first and second comparators, respectively, for establishing the charge and discharge cut-off temperature thresholds, respectively.