Methods for charging a rechargeable battery
AssigneeLeadtrend Technology Corp.
InventorsYeu Torng Yau, Tsung Liang Hung
Life of this patent
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Abstract
Disclosure has a method for charging a rechargeable battery. The rechargeable battery is charged by a charger in a first constant current mode for a main charge time period. After the main charge time period, the charger stops charging the rechargeable battery for a relaxation time period. During a sample time period that starts after a predetermined settle time period following the beginning of the relaxation time period, the charger detects an open-circuit voltage of the rechargeable battery to compare with a target voltage. If the open-circuit voltage is less than the target voltage, the charger charges the rechargeable battery in a second constant current mode for a coercive charge time period.
Claims20
A method for charging a rechargeable battery, comprising:
- charging the rechargeable battery in a first constant current mode for a main charge time period;
- after the main charge time period, stopping charging the rechargeable battery for a relaxation time period;
- during a sample time period that starts after a predetermined settle time period following the beginning of the relaxation time period, detecting an open-circuit voltage of the rechargeable battery and comparing the open-circuit voltage with a target voltage;
- and
- if the open-circuit voltage is less than the target voltage, charging the rechargeable battery in a second constant current mode for a coercive charge time period.
A method capable for recharging a rechargeable battery, comprising:
- charging the rechargeable battery in a pre-charge constant current mode, until a battery voltage of the rechargeable battery exceeds an under voltage;
- after charging the rechargeable battery in the pre-charge constant current mode, charging the rechargeable battery in a first constant current mode until the rechargeable battery exceeds a target voltage, wherein the target voltage is higher than the under voltage;
- after charging the rechargeable battery in the first constant current mode, stopping charging the rechargeable battery for a predetermined settle time period;
- after the predetermined settle time period, detecting an open-circuit voltage of the rechargeable battery and comparing the open-circuit voltage with the target voltage;
- and
- charging the rechargeable battery in a second constant current mode for a coercive charge time period, if the open-circuit voltage is less than the target voltage.
Dependencies are inferred from the claim text.