Method for determining the state of charge of lead-acid rechargeable batteries
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United States of America Patent
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May 21, 2002
Grant Date -
Nov 1, 2001
app pub date -
Feb 22, 2001
filing date -
Feb 23, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for determining the state of charge of lead-acid rechargeable batteries comprising a) substantially simultaneously measuring measured-value pairs (U.sub.i, I.sub.i) of the rechargeable battery voltage and current flowing at time t.sub.i over time interval dt, b) selecting a group of said measured-value pairs (Ui, I.sub.i) for which only a discharge current flowed in the last time interval dt, c) varying parameters Uo, R and C such that a residual sum of squares between values U.sub.i given by formula (1) U.sub.i =Uo-R*I.sub.i +1/C.intg.Idt (1) and measured values U(t.sub.i) is minimized, wherein Uo represents no-load voltage, R represents resistance and C represents capacitance, and d) calculating the state of charge of the rechargeable battery from the no load voltage obtained from formula (1).
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