THERMISTOR HEAT SINK FOR NiMH CHARGE CONTROL
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-29
Nickel electrode NiMH cells typically heat significantly at the beginning of fast charge. This early heating can cause chargers to trip early if the primary termination is AT Ifthe charger cannot be modified to accommodate this early heating (by ignoring AT for, say, the first five minutes of fast charge) then the solution needs to be in the battery. The heat sink, placed between the cells and the thermistor, delays and smooths out the initial heating so that early trip will not occur. As the battery con- tinues to charge the heat sink temperature saturates and the thermistor will accurately reflect the cell temperature so that at the end of fast charge correct AT charge termination will occur.