An Approach to Describe Lead-Acid Batteries Lifetime By Combining Electrochemical and Electric Models

Abstract

In this work, a model for lead-acid batteries that combines electric and electrochemical models is proposed and analyzed with respect to experimental data extracted from Huatacondo power plant in Chile. Using experimental overpotential versus current curves, our approach combines the Butler-Volmer equation with an electric model developed by Schiffer et al [1] to predict performance and quantify ageing mechanisms, which determine battery internal resistances and capacity for discharge cycles, based on phenomenological basis through Butler-Volmer ans Shiffer models. A good correspondence between voltage-current curves and experimental data was obtained especially at low currents (activation zone). Our approach shows that overpotentials at discharge times in which State-of-Charge (SoC) is above 0.8 (one hour approximately) are mainly due to gas production (gassing current) and degradation of active mass. 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