Method of rapidly charging a lithium ion cell
First Claim
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1. A method for rapidly charging a Lithium ion electrochemical cell, said method comprising the steps of:
- (i) providing a Lithium ion electrochemical cell;
(ii) applying an electrical charge pulse current to said electrochemical cell, said charge pulse terminating upon the occurrence of either a pre-selected maximum charge time, or a pre-selected maximum cell voltage;
(iii) providing a rest period during which no load or current is applied to said cell; and
(iv) applying a discharge pulse to said electrochemical cell, said discharge pulse terminating upon the occurrence of either a pre-selected discharge period of time, or a pre-selected minimum cell voltage.
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Abstract
A battery charger for lithium ion cells closely monitors cell voltage, and charge time, so as to avoid the over-application of charge to the cell. Charge pulses (104) are followed by a first rest (110), a discharge (112) and a second rest, (120) period prior to re-initiating the charge pulse. If the battery voltage reaches a preselected maximum, in less than a pre-selected period of time, the charge pulse is reduced by a preselected minimum factor. Cycling of the cell is continued until the cells are fully charged.
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Citations
15 Claims
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1. A method for rapidly charging a Lithium ion electrochemical cell, said method comprising the steps of:
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(i) providing a Lithium ion electrochemical cell; (ii) applying an electrical charge pulse current to said electrochemical cell, said charge pulse terminating upon the occurrence of either a pre-selected maximum charge time, or a pre-selected maximum cell voltage; (iii) providing a rest period during which no load or current is applied to said cell; and (iv) applying a discharge pulse to said electrochemical cell, said discharge pulse terminating upon the occurrence of either a pre-selected discharge period of time, or a pre-selected minimum cell voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for rapidly charging a lithium ion electrochemical cell, said method comprising the steps of:
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providing a lithium ion electrochemical cell; applying an electrical charge pulse current to said electrochemical cell, said charge pulse terminating upon the occurrence of either a pre-selected maximum charge time, or a pre-selected maximum cell voltage; providing a first rest period during which no load or current is applied to said cell; applying a discharge pulse to said electrochemical cell said discharge pulse terminating upon the occurrence of either a pre-selected minimum cell voltage, or a pre-selected discharge period of time; and providing a second rest period during which no load or current supply to said cell; and repeating said charge-rest-discharge-rest cycle until said electrochemical cell is substantially completely charged. - View Dependent Claims (14, 15)
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Specification