Charger for use with a nickel-cadmium battery that uses charge a

Details Charger for use with a nickel-cadmium battery that uses charge a Charger for use with a nickel-cadmium battery that uses charge a

1994-06-20

1997-05-13

Nappi, Robert

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 32, 320 14, H01M 1044, H01M 1046

Patent

active

056296002

ABSTRACT:
A charger has a charging unit for charging a Ni-Cd battery using a DC supply, a charging switch, and a discharging unit for discharging, by a predetermined quantity, an electric charge stored in the Ni-Cd battery by the charging unit. Further, the charger repeats a charging and discharging process a predetermined number of times to charge the Ni-Cd battery. A controller cuts off a charging current flowing in the Ni-Cd battery when the value of the charging current reaches a rated capacity of the Ni-Cd battery and subsequently effects a repetitive control of both the charging of the Ni-Cd battery and the cutting off of the charging current. Thus, a Ni-Cd battery whose electromotive force has been reduced and whose internal electric resistance has increased can be charged without continuously producing heat. Accordingly, the charger can recover a Ni-Cd battery whose electromotive force has been reduced because the Ni-Cd battery has been unused for a long period without deteriorating the Ni-Cd battery.

REFERENCES:
patent: 4709202 (1987-11-01), Koenck et al.
patent: 4734635 (1988-03-01), Theobald
patent: 5289102 (1994-02-01), Toya
patent: 5307000 (1994-04-01), Podrazhansky et al.
patent: 5440220 (1995-08-01), Sato et al.
patent: 5479084 (1995-12-01), Satsuma et al.
patent: 5488282 (1996-01-01), Hayden et al.

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