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 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.
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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.
27 Citations
18 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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 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; 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 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
,establishing the charge and discharge cut-off temperature thresholds with first and second resistors, respectively, coupled to the first and second comparators, respectively. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification