State-of-charge coulometer

Details State-of-charge coulometer State-of-charge coulometer

1982-04-09

1985-02-12

Tokar, Michael J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

429 58, G01N 2746

Patent

active

044994249

ABSTRACT:
A coulometer for accurately measuring the state-of-charge of an open-cell battery utilizing an aqueous electrolyte. The coulometer includes a current meter (38) for measuring the battery charge/discharge current and a flow meter (42) for measuring the rate at which the battery produces gas during charge and discharge. Coupled to the flow meter is gas analyzer (54) which measures the oxygen fraction of the battery gas. The outputs of the current meter, flow meter and gas analyzer are coupled to a programmed microcomputer which includes a CPU (68) and program and data memories (74), (76). The microcomputer calculates that fraction of charge and discharge current consumed in the generation of gas so that the actual state-of-charge can be determined. The state-of-charge is then shown on a visual display (80).

REFERENCES:
patent: 3680072 (1972-07-01), Charbonnier et al.
patent: 3890556 (1975-06-01), Melling et al.
patent: 3901729 (1975-08-01), Duddy
patent: 3946299 (1976-03-01), Christianson et al.
patent: 3984762 (1976-10-01), Dowgiallo, Jr.
patent: 4080560 (1978-03-01), Abert
patent: 4207514 (1980-06-01), Klein

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