Method and system for monitoring state of lead acid battery
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United States of America Patent
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Jan 4, 2005
Grant Date -
May 6, 2004
app pub date -
Nov 5, 2002
filing date -
Nov 5, 2002
priority date (Note) -
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Abstract
In order to monitor a state of a battery, a threshold value of an internal impedance of the battery is first determined. It is prepared an approximate expression indicating a correlation between a residual capacity of the battery and an internal impedance of the battery which is greater than the threshold value. The internal impedance of the battery is then measured. When the measured internal impedance is the threshold value or less, the residual capacity is determined as an initial value. When the measured internal impedance is greater than the threshold value, the residual capacity is monitored with the approximate expression.
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