Overcharge preventing device
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United States of America Patent
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Dec 14, 1999
Grant Date -
N/A
app pub date -
Jul 26, 1998
filing date -
Jul 23, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An overcharge preventing device for a high energy density battery such as a lithium ion battery comprises a voltage sensor means for sensing a voltage of a battery that is being charged, a current feeder means for feeding a current to a heat generating means when a voltage sensed by said voltage sensor means exceeds a preset voltage, and a repeatedly usable thermal actuator means that is thermally coupled to said heat generation means incorporated in a charging current circuit. Upon overcharging of the battery, the thermal actuator means is actuated by heat generated from the heat generating means to interrupt feeding of a charging current to the battery. Upon elimination of an overcharged state, the charging current circuit in the thermal actuator means is resumed to recharge the battery.
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