Method and apparatus for determining the state-of-charge of batt

Details Method and apparatus for determining the state-of-charge of batt Method and apparatus for determining the state-of-charge of batt

1984-09-10

1988-02-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

320 48, 340636, G01N 2746

Patent

active

047257849

ABSTRACT:
Method and apparatus for determining the state-of-charge of batteries, particularly lithium batteries, involves the steps of: (a) measuring the temperature of the battery; (b) loading the battery to produce a high discharge for a short period of time; (c) after a short rest period, measuring the open-circuit-voltage of the battery; and (d) determining from the measured temperature and open-circuit-voltage the residual state-of-charge of the battery. Preferably, the residual state-of-charge of the battery is determined by comparing the measured temperature and open-circuit-voltage with reference tables showing the state-of-charge at different temperatures and open-circuit-voltages for the respective battery.

REFERENCES:
patent: 4194146 (1980-03-01), Patry et al.
patent: 4377787 (1983-03-01), Kikwoka et al.
patent: 4460870 (1984-07-01), Tinger
patent: 4558281 (1985-12-01), Codd et al.

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