Rechargeable battery having overcharge protection circuit and method of charging rechargeable battery
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Mar 31, 1998
filing date -
Mar 31, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rechargeable battery is provided with an overcharge protection circuit which is particularly adapted for nickel metal hydride battery packs to be used in conventional charging adapters suitable for NI-CAD battery packs. The battery pack includes a microprocessor which measures the voltage across the electrical contacts of the battery pack. Upon reaching peak charge, the microprocessor increases the voltage appearing across the battery pack contacts. After a predetermined time period as measured by the microprocessor, the microprocessor decreases the voltage appearing across the battery pack terminals to exceed the change in voltage to which the charging adapter responds to terminate a high rate of charging.
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