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ADAPTIVE DELTA-T BATTERY CHARGE TERMINATION METHOD

IP.com Disclosure Number: IPCOM000006630D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-17

Publishing Venue

Motorola

Related People

Authors:
Scott M. Garrett

Abstract

Practical rapid charging of nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-Mh) batteries requires a reliable end-of-charge termination method. One such method is known as delta-T. This involves observing some signal indicating the temperature of the battery and ending rapid charge when the battery temperature changes some specified amount within a given time inter- val. Cell manufacturers recommend a delta-T of 1.6"C over 3 minutes to end rapid charge. By this scheme charg- ing ends when the battery temperature increases 1.6"C or more within a 3 minute interval.