摘要
锂电池作为可再生能源领域中储能系统的核心部件,其安全运行至关重要,然而锂电池在放电过程中的温升现象会严重影响其安全运行与使用寿命,甚至会导致事故的发生,因此,研究锂电池的工作温度对其安全的影响具有重要意义。本文首先根据实验数据分析了锂电池在充放电循环过程中的温度情况,分析发现:随着放电倍率的增大,锂电池在放电过程中的温升数值显著增大。然后根据锂电池的生热机理,建立了热效应模型并确定了热物性参数;随后建立了锂电池的三维模型并进行网格划分,选择非稳态导热的求解方法并设置材料参数,在常温、自然散热条件下,对锂电池在放电倍率分别为0.50、0.75、1.00、1.25、1.50 C的情况进行了放电热分析,分析了不同环境温度下锂电池的温度场情况,并对不同放电倍率下锂电池在何种环境温度下能达到理想的温度场进行了仿真模拟。仿真结果表明:锂电池的最高温度会随放电倍率的变化而变化,并在放电倍率为1.5 C时达到限值;此外,改变环境温度可降低锂电池的最高温度。
As core component of energy storage system in the field of renewable energy,the safe operation of lithium battery is very important.However,the temperature rise of lithium battery during discharge will seriously affect its safe operation and service life,and even lead to accidents.Therefore,it is of great significance to study the impact of lithium battery working temperature on its safety.Firstly,according to the experimental data,the temperature of lithium battery during charge and discharge cycle is analyzed.It is found that the value of temperature rise of lithium battery increases significantly in the process of discharge with the increase of discharge rate.Then,according to the heat generation mechanism of lithium battery,the thermal effect model is established and the thermophysical parameters are determined.Then,the three-dimensional model of lithium battery is established and meshed,the solution method of unsteady heat conduction is selected and the material parameters are set.Under the conditions of normal temperature and natural heat dissipation,the electric discharge heat of lithium battery at discharge rate of 0.50,0.75,1.00,1.25 and 1.50 C respectively is analyzed,as well as the temperature field of lithium battery at different ambient temperatures.The ideal temperature field of lithium battery under different discharge rates is simulated.The simulation results show that the maximum temperature of the lithium battery varies with discharge rates,and reach the limit when the discharge rate is 1.5 C.It is also found that changing the ambient temperature can reduce the maximum temperature of the lithium battery.
作者
洪杰
孙明生
傅琰
徐志成
王军
梁岩
Hong Jie;Sun Mingsheng;Fu Yan;Xu Zhicheng;Wang Jun;Liang Yan(Jiangsu New Energy Development Co.,Ltd.,Nanjing 210005,China;Key Laboratory of Solar Energy Science and Technology in Jiangsu Province,School of Energy and Environment,Southeast University,Nanjing 210096,China)
出处
《太阳能》
2022年第1期20-33,共14页
Solar Energy
关键词
锂电池
放电倍率
热分析
储能
退役动力电池
温度场
lithium battery
discharge rate
thermal analysis
energy storage
retired power battery
temperature field
