Method for charging secondary battery and charger used therefor
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United States of America Patent
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Nov 19, 1996
Grant Date -
N/A
app pub date -
May 3, 1994
filing date -
May 14, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A secondary battery charging method and a charger used therefor, in which the method uses a constant current and a constant voltage such that the secondary battery is first charged with the constant current until the terminal voltage of the battery becomes a reference voltage higher than the full charging voltage for the battery and then further charged with the constant voltage which is equal to the full charging voltage. These two charging operations are switched by using various kinds of detection and control circuits so that the secondary battery is properly charged in a short time. Further, the charger of the present invention is provided with a circuit for charging a plurality of battery cells simultaneously or separately.
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