Impact of Mismatched Cell Characteristics on Lead-Acid Battery Charging 830228
Over the operational life of a battery, the voltage characteristics of its individual cells become mismatched due to differences in self-discharge rates, individual charge efficiency, active material retention, etc. As these cell differences increase, excessive overcharging, operating temperatures, and/or electrolyte consumption result. In a series of tests performed on 6-volt, lead-acid modules, the degree of cell mismatch and the response of the modules to various charge methods were examined. The results show that after about 150 deep-discharge cycles, each module contained at least one cell whose full-charge voltage level was reduced. Prior to any decline in module capacity, cell voltage differences of more than 0.4 V were measured during charge. It was also observed that the application of a fixed battery voltage for charge control eventually caused excessive overcharging, elevated temperatures, and/or an extreme overvoltage condition on individual cells. This paper describes the test procedures employed, presents the test data, discusses the results obtained and solutions being investigated.
Citation: DeLuca, W., Tummillo, A., Biwer, R., and Yao, N., "Impact of Mismatched Cell Characteristics on Lead-Acid Battery Charging," SAE Technical Paper 830228, 1983, https://doi.org/10.4271/830228. Download Citation
Author(s):
W. H. DeLuca, A. F. Tummillo, R. L. Biwer, N. P. Yao
Affiliated:
Argonne National Laboratory Argonne, IL
Pages: 8
Event:
SAE International Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Lead-acid batteries
Test procedures
Batteries
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