Rechargeable battery pack and charger unit combination

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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Details

320 2, H02J 704, H01M 1044

Patent

active

048292265

ABSTRACT:
A battery pack containing a rechargeable battery is detachable to a charger unit for charging under the control of a charging circuit in the charger unit. The battery pack includes a sensor output circuit which comprises a temperature sensor for sensing the temperature of the battery being charged. A voltage dividing resistor network is formed in the sensor output circuit and receives a constant current from the charging circuit upon attachment of the battery pack to the charger unit such that it provides an enable signal of a first voltage level to the charging circuit for allowing the charging of the battery at a first charge rate so long as the sensed battery temperature is below a predetermined reference level. When the sensed battery temperature exceeds the reference level, the voltage dividing resistor network responds to provide a stop signal of a second voltage level for inhibiting the charging at the first charge rate. Also included in the sensor output circuit is a hold circuit which holds to provide the stop signal to the charging circuit once the sensed temperature exceeds the reference level.

REFERENCES:
patent: 4006396 (1977-02-01), Bogut
patent: 4006397 (1977-02-01), Cattoti et al.
patent: 4668902 (1987-05-01), Zeller, Jr.
patent: 4686444 (1987-08-01), Park
patent: 4727006 (1988-02-01), Malinowski et al.

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