Battery charger
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United States of America Patent
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Mar 7, 1995
Issued Date -
N/A
app pub date -
Sep 11, 1992
filing date -
Mar 13, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A charger for rechargeable cells or batteries utilizes a mechanism whereby resistance-free voltage is continually monitored during periodic current-off intervals in the charging process and compared to an independent reference voltage to prevent overcharge. After a certain degree of charge has been obtained, the current is gradually reduced to a finishing charge. Several means are provided for terminating the finishing charge while avoiding overcharge. Another embodiment of a charger provides for measurement of the resistance-free voltage during the current-off period after sufficient time is allowed for the recombination of any oxygen which may have been produced during charging, thus taking into account inherent variations in cells of the same type.
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