Battery charge management architecture
First Claim
1. A system for managing the operation of a battery having a plurality of serially connected individual cells comprising:
- a charger electrically in parallel with each individual cell operable for charging the cell together with a bypass device including sensing means for detecting an operating condition of the cell; and
a charge controller electrically connected with each of said bypass devices, said charge controller being operable in response to an operating condition of a cell detected by said sensing means which is outside a predetermined range of magnitudes to change said bypass device to the conductive mode and thereby shunt current around the battery cell, while leaving unaffected each of the remaining cells.
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Accused Products
Abstract
A system for managing the operation of a battery such as a lithium ion battery having a plurality of serially connected individual cells comprises a bypass module electrically in parallel with each individual cell or, alternatively, with at least one of the cells or alternatively again with an individual cell and its associated grouping of one or more parallel cells. The module includes a sensor for detecting an operating condition of its associated cell and a charger operable for charging the cell. A charge controller is electrically connected with each bypass module and is operable in response to an operating condition of a cell detected by the sensor which is outside a predetermined range of magnitudes to change the bypass module to the conductive mode and thereby shunt current around the battery cell, while leaving unaffected each of the remaining cells. The charge controller includes a processor with mode selecting means for initiating operation of the charger for charging each of the plurality of cells, and a capability for establishing voltage and current set points for each of the bypass modules to thereby prevent overcharging of each associated cell. The processor is also operable for performing a multi step charge profile for each of the bypass modules such that when a predetermined voltage is achieved at the conclusion of a step, a subsequent step is performed at a reduced charge current until a final predetermined voltage is achieved at a charge current which has been reduced to zero.
98 Citations
15 Claims
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1. A system for managing the operation of a battery having a plurality of serially connected individual cells comprising:
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a charger electrically in parallel with each individual cell operable for charging the cell together with a bypass device including sensing means for detecting an operating condition of the cell; and a charge controller electrically connected with each of said bypass devices, said charge controller being operable in response to an operating condition of a cell detected by said sensing means which is outside a predetermined range of magnitudes to change said bypass device to the conductive mode and thereby shunt current around the battery cell, while leaving unaffected each of the remaining cells. - View Dependent Claims (2, 3, 4, 5)
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6. In combination:
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a battery having a plurality of serially connected individual cells; a charger electrically in parallel with at least one of said individual cells operable for charging the cell together with a bypass device including sensing means for detecting an operating condition of the cell; and a charge controller electrically connected with each of said bypass devices, said charge controller being operable in response to an operating condition of said cell detected by said sensing means which is outside a predetermined range of magnitudes to change said bypass device to the conductive mode and thereby shunt current around said cell, while leaving unaffected each of the remaining cells. - View Dependent Claims (7, 8, 9, 10)
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11. A method of managing the operation of a battery having a plurality of serially connected individual cells comprising the steps of:
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(a) connecting a charger electrically in parallel with a plurality of the individual cells operable for charging the cell together with a bypass device including sensing means for detecting an operating condition of the cell, the bypass device normally being in the nonconductive mode; (b) connecting a charge controller electrically with each of the bypass devices; (c) sensing an operating condition of a cell which is outside a predetermined range of magnitudes; (d) in response to step (c), operating the charge controller to change the bypass device to the conductive mode and thereby shunt current around the battery cell, while leaving unaffected each of the remaining cells. - View Dependent Claims (12, 13, 14, 15)
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Specification