Method of detecting residual capacity of secondary battery
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United States of America Patent
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Jul 19, 2005
Grant Date -
Dec 19, 2002
app pub date -
Sep 20, 2001
filing date -
Sep 28, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Correlations between a residual capacity of a secondary battery and 4 parameters of an internal resistance, temperature, a discharge current and one of an open circuit voltage and a discharge voltage of the secondary battery are previously determined and a contour map of the residual capacity and 2 of the parameters is made, for example. Then, at least 2 varying parameters selected from the 4 parameters are detected while the secondary battery is in use and collated with the correlations to estimate the residual capacity of the secondary battery.
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