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Temperature-based charge and discharge control for a battery

  • US 8,098,051 B2
  • Filed: 08/23/2010
  • Issued: 01/17/2012
  • Est. Priority Date: 07/24/2006
  • Status: Active Grant
First Claim
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1. 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.

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