Method and system for monitoring state of lead acid battery

Details Method and system for monitoring state of lead acid battery Method and system for monitoring state of lead acid battery

2005-01-04

2005-01-04

Tibbits, Pia (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

Reexamination Certificate

active

06838883

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.

REFERENCES:
patent: 6313607 (2001-11-01), Champlin
patent: 6469471 (2002-10-01), Anbuky et al.
patent: 6495990 (2002-12-01), Champlin
patent: 6597150 (2003-07-01), Bertness et al.
patent: 6-194428 (1994-07-01), None
patent: 11-7985 (1999-01-01), None
David Linden, Hanbook of Batteries, Second Edition 1995, pp. 2.25-2.27, and 24.39-24.40.

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