Battery charger circuit including battery temperature control

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

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Details

320 22, 320 35, 320 20, 320 40, H02J 706

Patent

active

055044166

ABSTRACT:
An adaptive battery charger circuit including a state machine adjusts the charging current in accordance with the battery charge acceptance. The battery charging cycle includes an initial charging phase characterized by a relatively high charge acceptance, an intermediate charging phase characterized by a decreasing charge acceptance and a rising battery temperature, and a final charging phase characterized by the battery being at substantially full charge and the charge acceptance approaching zero. Each charging phase corresponds to one or more states of the state machine. Multiple sets of conditions causing transitions between the states of operation are derived from a model of a battery under charge which relates charge acceptance, battery temperature, and cumulative supplied charge. During the intermediate charging phase, the charging current is adjusted to maintain a predetermined battery temperature for a predetermined duration. With this arrangement, the maximum product of charging current and charge acceptance maintainable for the battery without exceeding a safe temperature is continuously achieved.

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