Protection device for secondary batteries, and battery pack and electronic equipment employing same
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United States of America Patent
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Jun 25, 2013
Grant Date -
Sep 23, 2010
app pub date -
Mar 17, 2010
filing date -
Mar 17, 2009
priority date (Note) -
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Abstract
A protection device includes a voltage detector having N or more sub-circuits each for monitoring a specific battery cell to output a detection signal when at least one of the battery cells outputs an abnormal voltage. Each sub-circuit includes voltage dividing resistors, a reference voltage generator, and a comparator. The voltage dividing resistors generate a voltage division signal by dividing an output voltage of the battery cell. The reference voltage generator generates a reference voltage. The comparator compares the voltage division signal against the reference voltage. Each comparator is powered with voltage across the battery cell associated with the sub-circuit.
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