| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of charging secondary battery in which excessive charging is prevented and battery pressure is controlled to lower level, thereby enhancing safety, and charging capacity is increased to moderate level, thereby increasing battery lifetime and its device. SOLUTION: A method of charging a secondary battery in which variations in voltages of batteries per unit time during charging are computed, and a charging operation is stopped when a drop of 0.0005 to 0.0015 V/10 s takes place from the maximum value of variations of the voltages. And a charging device of the secondary battery which comprises a switch, a voltage measuring apparatus for measuring battery voltages, and a controller for computing variations of measured voltages, and for sending power off signals to the switch when a drop of 0.0005 to 0.0015 V/10 s takes place, from the maximum value of the voltage variations. COPYRIGHT: (C)2004,JPO
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