A Composite Battery Model Based on Actual Reaction Mechanisms of Lithium-Ion Batteries

An accurate and applicable battery model is of great significance for the effective management of electric vehicle's battery management systems. Based on the actual reaction mechanism inside the battery, a composite battery model is proposed in this paper. The proposed composite battery model considers important reactions such as charge transfer at the solid-liquid interface, solid-liquid phase diffusion of Li
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, and gives a new way of characterizing some reactions based on the electrochemical model. In addition, the extended Kalman filter-based online parameter identification method makes the proposed battery model well-adapted to dynamic environments. The experimental results show that proposed composite battery model has higher model accuracy than the conventional equivalent circuit model, and the established online parameter identification model can make the proposed composite battery model better adapt to the dynamic environment.