The validation of approximate model for lithiumion solid phase diffusion under operating conditions

This paper aims to verify the effectiveness of parabolic approximate models for the solid phase diffusion process under the batteries actual discharge conditions. Choosing 1C, 4C constant current and FUDS discharge conditions, two-parameter, three-parameter parabolic approximate model and theory numerical algorithm are conducted to simulate the solid phase surface concentration curve in Maple environment after obtaining the reaction ion flux density jp curve of particle surface at the separator/cathode interface by COMSOL. The result shows that parabolic approximate model is effective when applied to the simulation of the solid phase diffusion process, and three-parameter model is better than two-parameter model in terms of tracking ability for dynamic loads.