An Electrochemical Thermal Coupling Model for High C-rate Conditions in Lithium-ion Batteries

Abstract

There are many situations in which lithium-ion batteries are required to discharge at high C-rates in engineering applications. However, the battery model cannot be well simulated in the high C-rate. In this paper, the electrochemical thermal coupling model parameters are modified in order to solve the problem of insufficient simulation accuracy at high C-rate discharge. The modified model takes into account the effects of non-uniform concentration distribution and ion current density changes on the model parameters during reaction polarization, solid-phase diffusion, and liquid-phase diffusion, and the relevant parameters are fitted with the current.