计及电池老化的电池温度仿真与验证

Simulation and verification of battery temperature considering battery aging

针对锂离子电池温度估算问题,提出一种基于电化学机理的电池温度估计方法。以容量为3.2 Ah的18650三元锂离子电池为研究对象,在考虑电池老化对电池温度影响的基础上,根据18650电池结构和电池传热规律,计算电池在使用过程中的内部产热速率,并采用有限差分法估算电池表面温度,最后通过MATLAB/SIMULINK搭建锂离子电池电化学-热耦合模型。仿真结果表明仿真温度与实验测得的温度变化趋势基本一致,为动力电池的热管理系统提供了一定的参考依据。

Aiming at the internal temperature of lithium-ion batteries estimation problem,a method based on electrochemical mechanism was proposed.Taking 18650 ternary lithium ion battery with a capacity of 3.2 Ah as the research object,on the basis of considering the influence of battery aging on the battery temperature,the internal heat generation rate of the battery in the process of use was calculated according to the battery structure of 18650 and the battery heat transfer rule,and the surface temperature of the battery was estimated by the finite difference method,Finally,the electrochemical-thermal coupling model of lithium-ion battery was established by MATLAB/SIMULINK.The simulation results show that the simulated temperature is basically consistent with the measured temperature trend,which provides a certain reference for the thermal management system of power battery.