锂离子电池温度变化过程仿真与验证

Simulation and verification of lithium-ion battery temperature changing process

针对软包锂离子电池放电过程中温度变化过程进行研究,依据电池产热基本理论,通过内阻实验及0.5C放电倍率下的温升实验计算出瞬态生热率曲线,得出电池熵热系数,建立生热速率随放电深度不断变化的瞬态生热模型,基于该模型进行不同放电倍率的温度仿真模拟,并与实验进行对比。结果表明,温度变化模拟结果与实验相吻合,生热率变化模拟结果与实验计算值相符合,模型可以很好地模拟电池在不同放电倍率下的温度变化,对电池温升过程分析及电池热管理过程控制具有指导意义。

To investigate the temperature-variation of the soft package lithium-ion battery during discharge,based on the basic heat generation model,through internal resistance test and temperature rise experiment under 0.5 C discharge,the transient heat rate curve is calculated and entropy coefficient is obtained.A transient thermal model can be established and the heating rate varies with the depth of discharge changing.The temperature variation was simulated by using this model and compared with the experiment.It shows that the simulation results are consistent with the experiment.This model can simulate the battery temperature change process under different discharge ratio very well,which has guiding mean for the battery temperature variation analysis and the thermal management.