A Hybrid Electric Circuit Battery Model Capturing Dynamic Battery Characteristics

Abstract

An accurate and dynamic battery model that could be simulated in a circuit designing environment is critical for the designing of energy efficient systems. A variety of battery models have been proposed but they leave room for improvement as they do not account for all the nonlinear dynamic battery characteristics in model with sufficient accuracy. For energy aware circuit designing, we need an equivalent circuit model that can be co-simulated in circuit simulation environment and is capable of predicting the dynamic battery characteristics with higher accuracy. The proposed model is a hybrid model composed of diffusion model and combined electric circuit-based model, which accounts for nonlinearities of rate capacity effect, recovery effect, capacity fading, storage runtime and open circuit voltage, current- and temperature- dependency to transient response. This new hybrid model is simulated in MATLAB-Simulink and the results are validated through experimental observations for Lithium ion, Lead Acid and Nickel Metal Hydride batteries.