Device for improving the current output of a chargeable battery at low outside temperatures
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United States of America Patent
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Apr 16, 1996
Grant Date -
N/A
app pub date -
Jun 21, 1994
filing date -
Dec 21, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery heating device includes a temperature sensor and at least one heating element in a liquid and acid-proof arrangement inside the battery. The heating element is a power transistor secured to a cooling plate which is powered by the battery, the emitter of the power transistor being powered by a temperature control circuit when the battery temperature falls below a predetermined reference temperature and the battery voltage is higher than a lower threshold and lower than a higher threshold. A trigger circuit responds to a rise in battery voltage after the current in a load having a high current consumption is switched off. The trigger circuit actuates a timer circuit which conductively controls the power transistor for a set time if the battery voltage is under or at the lower threshold.
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