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An Improved Equivalent Circuit Parameter Estimation Using Electrochemical Model for Lead-Acid Battery

The most favored approaches for Lead-acid battery simulation are Electrochemical and Equivalent Circuit Models. Electrochemical models although are accurate, suffer from being computationally expensive. Approximate Equivalent Circuit Models provide inadequate physical insight. In this paper we derive Equivalent Circuit Model parameters from the electro-chemical Leading Order Quasi Static (LOQS) model. This model derives electrical behaviour from the material properties. The Equivalent Circuit Model derived from this approach captures the entire dynamic and transient characteristics of the load. This reduced-order model is well suited for online estimation of State-of-Charge of Lead-acid batteries. The chief goal of this paper is to derive Equivalent Circuit Model Parameters that capture all the transient variations of the load.