Method and apparatus for charging a nickel-cadmium battery

Details Method and apparatus for charging a nickel-cadmium battery Method and apparatus for charging a nickel-cadmium battery

1986-12-15

1989-02-21

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 44, H02J 710

Patent

active

048068403

ABSTRACT:
The characteristic voltage-versus-time curve for a nickel-cadmium battery on a fast charge, e.g., being charged at the C/1 rate, increases to a peak voltage and thereafter decreases. To ensure that the battery is fully charged, the fast charge is discontinued on the decreasing portion of the voltage-versus-time curve. The fast charge may be stopped when a predetermined negative rate of change of the voltage is obtained. Or the fast charge may be cut off when the battery voltage decreases a predetermined amount below the peak, that is, when the difference between the maximum measured battery voltage and the present battery voltage exceeds a setpoint. After the fast charge is discontinued, a trickle charge, e.g., a C/10 charge or less, may be instituted or the charging current may be interrupted altogether, i.e., the battery charging circuit may be opened.

REFERENCES:
patent: 3895282 (1975-07-01), Foster et al.
patent: 4388582 (1983-06-01), Saar et al.

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