Method for charging batteries
First Claim
1. A method for charging rechargeable batteries comprising the steps of:
- charging a rechargeable battery;
sensing temperature of said battery;
calculating temperature change rate;
sensing voltage of said battery after the temperature change rate reaches a first predetermined value;
calculating voltage change rate; and
reducing current sent to the battery when the voltage change rate reaches a second predetermined value.
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Accused Products
Abstract
A method for charging and monitoring a rechargeable battery is proposed. The charging method includes charging a rechargeable battery, sensing temperature of said battery, and calculating temperature change rate. The method further includes sensing voltage of said battery after the temperature change rate reaches a predetermined value, calculating voltage change rate, and reducing current sent to the battery when the voltage change rate reaches a predetermined value. A second embodiment of the charging method may include charging a rechargeable battery, sensing temperature and voltage of said battery, and calculating temperature and voltage change rates. The method further includes sensing for a maximum voltage change rate after the temperature change rate reaches a predetermined value, and reducing current sent to the battery when the maximum voltage change rate is sensed. In addition, the method may include sensing for a minimum voltage change rate before sensing for the maximum change rate, wherein sensing for the maximum change rate would begin after the temperature change rate reaches a predetermined value or after the minimum voltage change rate is sensed.
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Citations
20 Claims
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1. A method for charging rechargeable batteries comprising the steps of:
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charging a rechargeable battery; sensing temperature of said battery; calculating temperature change rate; sensing voltage of said battery after the temperature change rate reaches a first predetermined value; calculating voltage change rate; and reducing current sent to the battery when the voltage change rate reaches a second predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for charging rechargeable batteries comprising the steps of:
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charging a rechargeable battery; sensing temperature and voltage of said battery; calculating temperature and voltage change rates; sensing for a maximum voltage change rate after the temperature change rate reaches a first predetermined value; and reducing current sent to the battery when the maximum voltage change rate reaches a second predetermined value. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A charger for charging rechargeable batteries comprising:
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at least three terminals for connecting the charger to a rechargeable battery; a current source connected to at least one of the terminals for providing current to the battery; a controller connected to the current source and at least one of the terminals for controlling the current sent to the battery, sensing battery voltage and temperature and calculating temperature and voltage change rates; wherein said controller senses voltage of said battery after the temperature change rate reaches a first predetermined value, and reduces current sent to the battery when the voltage change rate reaches a second predetermined value. - View Dependent Claims (16, 17)
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18. A charger for charging rechargeable batteries comprising:
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at least three terminals for connecting the charger to a rechargeable battery; a current source connected to at least one of the terminals for providing current to the battery; a controller connected to the current source and at least one of the terminals for controlling the current sent to the battery, sensing battery voltage and temperature and calculating temperature and voltage change rates; wherein said controller senses for a maximum voltage change rate after the temperature change rate reaches a first predetermined value, and reduces current sent to the battery when the maximum voltage change rate reaches a second predetermined value. - View Dependent Claims (19, 20)
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Specification