Apparatus and method for maintaining the charge of a battery

Details Apparatus and method for maintaining the charge of a battery Apparatus and method for maintaining the charge of a battery

1994-05-13

1996-02-20

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 35, 320 37, H01M 1044

Patent

active

054931983

ABSTRACT:
A battery charger (10) and associated method for maintaining the charge of a battery (12). The battery charger (10) has a processor (16), power supply (14) and power regulator (15). The battery charger (10) first applies a high current charge to the battery (12), which is terminated when the battery voltage or temperature reaches a defined limit. Then the battery charger (10) applies a low current charge (102) for a set period of time. Next, no charge is applied until the battery (12) cools to an ambient temperature. The ambient temperature is then measured using a thermistor (18) in the battery (12). If the ambient temperature is above a certain threshold no charge is applied for a wait period. If the ambient temperature is below the threshold the low current charge is applied for a the set period of time.

REFERENCES:
patent: 3740636 (1973-06-01), Hogrefe et al.
patent: 3852652 (1974-12-01), Jasinski
patent: 4392101 (1983-07-01), Saar et al.
patent: 4503378 (1985-03-01), Jones et al.
patent: 4554500 (1985-11-01), Sokira
patent: 4755735 (1988-07-01), Inakagata
patent: 4806840 (1989-02-01), Alexander et al.
patent: 5200690 (1993-04-01), Uchida
patent: 5289103 (1994-02-01), Eccleston
patent: 5302887 (1994-04-01), Ishiguro et al.
patent: 5331268 (1994-07-01), Patino et al.

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