Temperature-based charge and discharge control for a battery
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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Abstract
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; and, 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.
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Citations
20 Claims
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1. A protection circuit for a battery pack, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling charging and discharging of a battery pack, comprising:
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receiving from a thermistor a temperature of a cell in the battery pack; determining with a first comparator coupled to the thermistor whether the temperature has exceeded a charge cut-off temperature threshold for the cell, and if so, turning off a first switch to prevent charging of the cell; determining with a second comparator coupled to the thermistor whether the temperature has exceeded a discharge cut-off temperature threshold for the cell, and if so, turning off a second switch to prevent discharging of the cell; and
,establishing the charge and discharge cut-off temperature thresholds with first and second resistors, respectively, coupled to the first and second comparators, 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification