Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-10-20
1976-12-14
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
320 48, G01N 2742
Patent
active
039978346
ABSTRACT:
A method for determining the state-of-charge for zinc mercuric oxide type primary cells. I-V curves of the cells are plotted and the nearly constant slopes of these I-V curves above 75mA are measured graphically. These slopes are used to define effective differential DC resistance values (.DELTA.V/.DELTA.I).sub.75mA which have a linear relationship to charge expended, Q(A-h), which is graphically produced by plotting (.DELTA.V/.DELTA.I).sub.75mA versus Q(A-h). This relationship is used as a basis for a state-of-charge indicator to determine the remaining charge to about 12%. One can also subtract the internal resistance of the cell (measured with an a-c bridge technique) from (.DELTA.V/.DELTA.I).sub.75mA and obtain a new parameter, R.sub.p, which is related to the polarization resistance of the cell. The maximum uncertainty can be reduced to less than 10% if the linear curve is produced by plotting polarization resistance R.sub.p of the cell versus the charge expended Q(A-h). More significantly, the polarization based state-of-charge graph is linear out to 100% of discharge and is applicable to cells discharged at abnormally high current.
REFERENCES:
patent: 3515983 (1970-06-01), Lante
patent: 3808522 (1974-04-01), Sharaf
Peter Rohner et al., "Battery Impedance," Electrical Engineering, Sept. 1, pp. 922-925.
Breslin James T.
Ross Raymond L.
Rothwarf Frederick
Winter John J.
Dynda Frank J.
Edelberg Nathan
Gibson Robert P.
Rolinec R. V.
The United States of America as represented by the Secretary of
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