Patent ID: 8098051

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 to prevent charging of the cell; 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 to prevent discharging of the cell; and, first and second resistors coupled to the first and second comparators, respectively, for establishing the charge and discharge cut-off temperature thresholds, respectively; wherein the thermistor is coupled to respective first inputs of the first and second comparators and to a first pull-up resistor or pull-down resistor; and, wherein the first and second resistors are coupled to respective second inputs of the first and second comparators and to a second pull-up resistor.