Nickel-Cadmium Battery Cell Reversal from Resistive Network Effects
AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB
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During the individual cell short-down procedures often used for storing or reconditioning nickel-cadmium Ni-Cd batteries, it is possible for significant reversal of the lowest capacity cells to occur. The reversal is caused by the finite resistance of the common current-carrying leads in the resistive network that is generally used during short-down. A model is developed to evaluate the extent of such a reversal in any specific battery, and the model is verified by means of data from the short-down of a 4-cell, 3.5-A h battery. Computer simulations of short-down on a variety of battery configurations indicate the desirability of controlling capacity imbalances arising from cell configuration and battery management, limiting variability in the short-down resistors, minimizing lead resistances, and optimizing lead configurations. Authors keywords Battery, Nickel-cadmium, Reversal, Short-circuit, Storage.
- Electrochemical Energy Storage