Comparative Analysis of Electrical Equivalent Circuit Models for Lithium-Ion Batteries

Accurate modeling of lithium-ion batteries is crucial for battery management systems in ensuring reliability, efficiency, and performance for system operations such as estimating state of charge and state of health. This study evaluates three different electrical-based models for lithium-ion batteries: Rint, 1RC, and 2RC models. Although there are other models, each with advantages and disadvantages, exploration and analysis using simulation techniques are performed to determine the most suitable model for a particular application. The 2RC model is the most effective and highly accurate due to its comprehensive representation of complex battery behaviors. It represents different types of resistance along with capacitance effects. This consideration of multiple factors allows the 2RC model to reflect the complexities of battery performance more accurately.