摘要
电动汽车火灾事故频发使车用锂电池安全问题受到广泛关注。为研究车用锂电池起火燃烧特性,建立一种基于火灾动力学理论的锂电池单体起火燃烧数值模型,并借助FDS进行模型计算和仿真。以某款车用锂电池单体为研究对象,对该单体在热失控时的起火燃烧过程进行仿真,并进行该单体的热失控实验。与实验结果对比发现,模型准确地模拟出单体燃烧时冒烟、起火、剧烈燃烧、熄灭的火情演变过程,仿真温度曲线揭示了电池热失控时燃烧速度快、火焰强度大、热量爆发集中的特点,验证了模型的可靠性。分析仿真得到的CO2释放速率、CO释放速率、热释放速率和总释放热量等参数随时间的变化曲线,研究结果表明:有效抑制单体热失控及其燃烧蔓延对提高电池包安全性有重要意义。
The safety of lithium batteries has been widely concerned due to the frequent fire accidents of electric vehicles.In order to study the combustion characteristics of vehicle lithium-ion battery,a numerical model for the combustion of lithium-ion battery cell based on fire dynamics theory is established,and the model is calculated and simulated with the help of FDS.Taking a lithium-ion battery cell of a vehicle as the research object,the combustion process of the cell under thermal runaway is simulated,and the thermal runaway experiment of the cell is carried out.Compared with the experimental results,the model accurately simulates the evolution process of smoke,fire,intense combustion and extinguishing when the cell burns,and the simulated temperature curves reveal the battery thermal-runaway characteristics of fast combustion speed,high flame intensity and concentrated heat burst,thus verifies the reliability of the model.The simulated curves of CO2 release rate,CO release rate,heat release rate and total heat release rate over time are analyzed,which indicate that it is of great significance to effectively inhibit the thermal runaway and combustion spread of cell for improving the safety of battery pack.
作者
陈吉清
冼君琳
兰凤崇
刘得星
CHEN Jiqing;XIAN Junlin;LAN Fengchong;LIU Dexing(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Provincial Automobile Engineering Key Laboratory, South China University of Technology, Guangzhou 510640, China)
出处
《重庆理工大学学报（自然科学）》
北大核心
2021年第9期25-34,共10页
Journal of Chongqing University of Technology：Natural Science
基金
国家重点研发计划项目(2018YFB0104100)
国家市场监管总局项目(NAIS)
广东省科技计划项目(2015B010137002)。
