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Role of electrical resistance of electrodes in modeling of discharging and charging of flooded lead-acid batteries

Gandhi, KS (2015) Role of electrical resistance of electrodes in modeling of discharging and charging of flooded lead-acid batteries. In: JOURNAL OF POWER SOURCES, 277 . pp. 124-130.

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Official URL: http://dx.doi.org/ 10.1016/j.jpowsour.2014.12.003


Electrical resistance of both the electrodes of a lead-acid battery increases during discharge due to formation of lead sulfate, an insulator. Work of Metzendorf 1] shows that resistance increases sharply at about 65% conversion of active materials, and battery stops discharging once this critical conversion is reached. However, these aspects are not incorporated into existing mathematical models. Present work uses the results of Metzendorf 1], and develops a model that includes the effect of variable resistance. Further, it uses a reasonable expression to account for the decrease in active area during discharge instead of the empirical equations of previous work. The model's predictions are compared with observations of Cugnet et al. 2]. The model is as successful as the non-mechanistic models existing in literature. Inclusion of variation in resistance of electrodes in the model is important if one of the electrodes is a limiting reactant. If active materials are stoichiometrically balanced, resistance of electrodes can be very large at the end of discharge but has only a minor effect on charging of batteries. The model points to the significance of electrical conductivity of electrodes in the charging of deep discharged batteries. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Lead-acid battery; Electrode resistance; Percolation; Mathematical model
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 19 Mar 2015 11:36
Last Modified: 19 Mar 2015 11:36
URI: http://eprints.iisc.ac.in/id/eprint/51025

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