LITHIUM ION BATTERY PACK
First Claim
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1. A battery pack comprising:
- a housing;
a plurality of lithium ion battery cell groups, each of the battery cell groups comprising a plurality of battery cells configured in parallel, wherein the plurality of battery cell groups are disposed in the housing;
a plurality of current conducting intercell tabs interconnecting the battery cell groups in series;
a controller having a voltage sensor, wherein the intercell tabs are coupled to the controller such that the voltage sensor can sense the voltage across each individual battery cell group and wherein the controller, in response to the sensed voltage across each individual battery cell group indicating that the voltage across one of the battery cell groups is higher or lower than a respective upper or lower threshold voltage, affects respective charging or discharging of the battery pack.
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Abstract
A lithium iron phosphate battery pack is disclosed. The battery pack includes a plurality of battery cells, arranged as groups of cells, a controller circuit, and a plurality of intercell tabs coupling the groups of battery cells to the controller circuit. The controller circuit includes a voltage sensor for monitoring the voltage across each of the groups of cells. If one of the groups has a voltage that is lower or higher than a respective lower or upper threshold voltage, the controller circuit will shut off the charge/discharge cycling of all the groups of cells. In doing so, the controller circuit protects the entire battery pack during charge/discharge cycling.
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Citations
9 Claims
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1. A battery pack comprising:
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a housing; a plurality of lithium ion battery cell groups, each of the battery cell groups comprising a plurality of battery cells configured in parallel, wherein the plurality of battery cell groups are disposed in the housing; a plurality of current conducting intercell tabs interconnecting the battery cell groups in series; a controller having a voltage sensor, wherein the intercell tabs are coupled to the controller such that the voltage sensor can sense the voltage across each individual battery cell group and wherein the controller, in response to the sensed voltage across each individual battery cell group indicating that the voltage across one of the battery cell groups is higher or lower than a respective upper or lower threshold voltage, affects respective charging or discharging of the battery pack. - View Dependent Claims (2, 3, 5, 6)
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4. A battery pack comprising:
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a housing; a plurality of lithium ion battery cell groups interconnected, each of the battery cell groups comprising a plurality of battery cells configured in parallel, wherein the plurality of battery cell groups are disposed in the housing; a plurality of current conducting intercell tabs interconnecting the battery cell groups in series; a controller having a voltage sensor, wherein the intercell tabs are coupled to the controller such that the voltage sensor can sense the voltage across each individual battery cell groups and wherein the controller, in response to the sensed voltage across each individual battery cell group indicating that the voltage across one of the battery cell groups is higher or lower than a respective upper or lower threshold voltage, terminates the respective charging or discharging of all of the battery cell groups.
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7. For a battery pack comprising a housing and a plurality of lithium ion battery cell groups, each of the battery cell groups comprising a plurality of battery cells configured in parallel, a method for preventing overcharging of the battery cell groups, the method comprising:
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providing a plurality of current conducting intercell tabs interconnecting the battery cell groups in series; providing a controller having a voltage sensor; coupling the intercell tabs to the controller such that the voltage sensor can sense the voltage across each individual battery cell group; sensing the voltage across each battery cell group; affecting the charging or discharging of a battery cell group in response to the sensed voltages indicating that the voltage across one of the battery cell groups is respectively higher or lower than a respective upper or lower threshold voltage. - View Dependent Claims (8, 9)
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Specification