Method of charging secondary batteries
First Claim
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1. A method of charging an electrical battery, comprising the steps of:
- (a) setting an initial current value of charging current;
(b) detecting the battery voltage at the beginning and end of a plurality of charging time intervals;
(c) determining a first voltage value of the difference in the battery voltage at the beginning and end of successive charging time intervals;
(d) determining a second voltage value of the difference between two successive first voltage values; and
(e) reducing the value of charging current from said initial current value to a lesser current value when said second voltage value thereafter changes from a positive value to a negative value.
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Abstract
In a method of charging secondary battery, the charging control is performed when it is detected that the secondary differential value of the detected voltage curve changes from positive value to a negative value at the point C or its near portion.
17 Citations
12 Claims
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1. A method of charging an electrical battery, comprising the steps of:
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(a) setting an initial current value of charging current; (b) detecting the battery voltage at the beginning and end of a plurality of charging time intervals; (c) determining a first voltage value of the difference in the battery voltage at the beginning and end of successive charging time intervals; (d) determining a second voltage value of the difference between two successive first voltage values; and (e) reducing the value of charging current from said initial current value to a lesser current value when said second voltage value thereafter changes from a positive value to a negative value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of charging an electrical battery, comprising the steps of:
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(a) setting an initial current value of charging current; (b) detecting the battery voltage at the beginning and end of at least two successive charging time intervals; (c) determining a first voltage value of the difference in the battery voltage at the beginning and of said successive charging time intervals; (d) determining a second voltage value of the difference between two successive first voltage values; (e) reducing the value of charging current to a first lower current value when said second voltage value thereafter changes from a positive value to a negative value; (f) reducing the value of charging current to a second lower current value when said first voltage value thereafter goes to a zero value or a negative value; and (g) determining when said first voltage value reaches a maximum negative value or said second voltage value goes to a positive value for indicating a full charge condition of said battery. - View Dependent Claims (9, 10, 11, 12)
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Specification