Eveready Battery Company, Inc.

Bobby L Tibbs

Richard A Hudson

Daniel L Killebrew

A battery pack includes a plurality of electrochemical cells and a control circuit. The battery pack provides power to a tool in the form of a pulse width modulated waveform. The plurality of electrochemical cells provide a total output voltage. The control circuit is coupled to the plurality of electrochemical cells and receives a trigger signal from the tool. In response to the trigger signal, the control circuit determines whether a pulse width of the pulse width modulated waveform requires adjustment. Additionally, the control circuit can be configured to receive an indication of the total output voltage. In this case, the control circuit determines whether the pulse width of the pulse width modulated waveform requires adjustment based on the level of the total output voltage.

Battery pack including input and output waveform modification capability

An overcharge protection circuit for a battery pack and a method of recharging a battery pack in which a charging adaptor having two charging terminals may be used for a metal hydride battery pack, or the like, despite the fact that such a charging adaptor is responsive to a detected change in voltage across the two battery pack terminals to terminate a high rate of charging. The overcharge protection circuit senses the temperature of the cells in the battery pack and, when the sensed cell temperature reaches a threshold temperature, adjusts the voltage appearing across the battery pack terminals to exceed the change in voltage to which the charging adaptor responds by terminating a high rate of charging.

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Gainesville, FL, United States of America

Bobby L Tibbs