Capacity Fading of Lithium-Ion Batteries Simulation Based on Multiphysics Coupling

For the analysis of the battery life under 1C charging and discharging condition, lithium-ion battery is selected as the research object, the electrochemical simulation model of the battery is constructed based on the theory of porous electrodes. The influence of external stress on the performance of lithium battery is analyzed by using the stress spectrum collected by Lithium-ion battery pack. The 1C charging and discharging condition of the lithium-ion battery is simulated by the electrochemical - Solid heat transfer - fluid heat dissipation - external stress coupling, and the cycle life of the lithium battery is analyzed. A method to reduce the amount of computation is used for the solid electrolyte interphase (SEI) generation reaction, the influence of stress on SEI generation is analyzed.