Fast Charge Algorithms for Lithium-Ion Batteries
First Claim
1. A battery charging system comprising:
- at least one controller programmed to sustain charging of a battery cell until a cell voltage exceeds a recommended maximum voltage by an amount defined by a charging current and a battery resistance such that the cell voltage continues to increase during charging without a constant voltage phase.
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Abstract
Electric and plug-in hybrid vehicles include a traction battery to provide vehicle power. The battery may be operated in a charge-depleting mode and require recharging from an external power source. Fast charging of the traction battery is achieved by allowing a charging voltage greater than a recommended charging voltage. The charging voltage is based on the charging current and an internal resistance of the traction battery. The resistance value may be estimated during charging to allow a dynamic maximum charging voltage. Charging may be terminated based on voltage, temperature, state of charge or time criteria. The fast charging allows the traction battery to be charged in a relatively fast period of time.
188 Citations
20 Claims
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1. A battery charging system comprising:
at least one controller programmed to sustain charging of a battery cell until a cell voltage exceeds a recommended maximum voltage by an amount defined by a charging current and a battery resistance such that the cell voltage continues to increase during charging without a constant voltage phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of charging a battery cell comprising:
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charging, by a controller, the battery cell at a generally constant current selected to cause the battery cell to acquire charge at a predetermined rate such that a battery voltage continues to increase during charging without a constant voltage phase; and terminating the charging when the battery voltage exceeds a recommended maximum voltage by an amount defined by the current and a battery resistance. - View Dependent Claims (10, 11, 12, 13)
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14. A battery charging system comprising:
at least one controller programmed to sustain charging of a battery cell at a generally constant current selected to cause the battery cell to acquire charge at a predetermined rate, and discontinue charging when a cell voltage exceeds a recommended maximum voltage by an amount defined by the current and a battery resistance to cause an immediate decrease in the cell voltage by approximately the amount. - View Dependent Claims (15, 16, 17, 18, 19, 20)
Specification