Analysing Performance of 2RC Equivalent Circuit Models of Li-Ion Cell for Embedded Code Generation

Lithium-ion (Li-ion) batteries are widely used in portable electronic devices and electric vehicles due to their high energy density and low self-discharge rate. Accurate modelling of Li-ion batteries is essential for battery management systems (BMS) and other applications. In this paper, three Li-ion battery models have been compared for embedded code generation: Simscape model, state-space model, and MathWorks built-in model. The models were evaluated for accuracy, simulation time, and ease of code generation. Simscape model and state-space model is based on 2RC equivalent circuit model of Li-Ion cell. Whereas, MathWorks built-in model use Li-Ion cell model already present in the library of Simscape toolset. The results show that all three models provided similar accuracy, but the state-space model was the fastest to simulate and the easiest to generate code from. The Simscape model was found to be easily configurable and the MathWorks model was found to be suitable for model fidelity verification. The findings of this study will help developers choose the appropriate model for their specific application.