Method of and apparatus for measuring the state of discharge of

Details Method of and apparatus for measuring the state of discharge of Method of and apparatus for measuring the state of discharge of

1986-11-03

1988-05-10

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

320 48, 340636, 324427, G01N 2746

Patent

active

047438550

ABSTRACT:
A method is described of measuring the state of discharge of a battery, i.e. the ratio between the supplied capacity and the nominal capacity.
The method consists in measuring a first internal impedance of the battery at a first frequency and a second internal impedance of the battery at a second frequency, then in determining the argument of the difference between the internal impedances, the resulting argument being representative of the state of discharge of the battery.
The method can be used to advantage to check in a rapid, accurate and non-destructive way whether batteries to be used in portable appliances, e.g. electronic watches, are in good working order before being fitted into the appliances.

REFERENCES:
patent: 3984762 (1976-10-01), Dowgiallo
patent: 4259639 (1981-03-01), Renirie
Karunathilaka et al., "The Impedance of the Alkaline Zinc-Mercury Oxide Cell. I. Cell Behavior and Interpretation of Impedance Spectra" in Journal of Applied Electrochemistry, vol. 11 (1981), pp.573-582.
Sathyanarayana et al. "Impedance Parameters and the State-of-Charge. I. Nickle-Cadium Battery" in Journal of Applied Electrochemistry, vol. 9 (1979) pp. 125-139.
Karunathilaka et al. "A State-of-Charge Test for the Li-CuO Cell" in journal of Applied Electrochemistry, vol. 13 (1983) pp. 351-354.
Karunathilaka et al. "The Prediction of the State-of-Charge of Some Primary Cells" in Journal of Applied Electrochemistry, vol. 13 (1983) pp. 577-586.

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