大容量磷酸铁锂电池热失控行为及测试气氛影响规律研究  

Study on thermal runaway behavior and test atmosphere effecting rule of high-capacity lithium iron phosphate battery

作　　者：李涵 王炎 华剑锋 张西龙 王贺武[2] 卢兰光[2] LI Han;WANG Yan;HUAJianfeng;ZHANG Xilong;WANG Hewu;LU Languang(College of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao Shandong 266520,China;State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100080,China;Sichuan New Energy Vehicle Innovation Center,Yibin Sichuan 644005,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]清华大学汽车安全与节能国家重点实验室,北京100080 [3]四川新能源汽车创新中心有限公司,四川宜宾644005

出　　处：《电源技术》2024年第8期1634-1641,共8页Chinese Journal of Power Sources

基　　金：国家自然基金青年基金(52207240);山东省基金青年项目(ZR2022QE099);四川省基金(2021YSYF0001);国家重点研发计划(2022YFB24048)。

摘　　要：120 Ah磷酸铁锂电池在惰性气氛下的密封压力舱中进行热失控测试,记录电池本体温度、环境温度,分析产气组分占比,计算电池产气量、排气速率及可燃极限。作为对照,在空气气氛下开展相同条件的实验,以考察不同气氛对电池热失控过程的影响。电池热失控过程经历了“加热温升-开阀排气-热失控-冷却降温”多个阶段。热失控过程中,电池上方环境温度逐渐降低。两种气氛下的电池产气都具有较高的爆炸危险性,与惰性气氛相比,空气气氛下电池温度提高17.6%,热失控持续时间延长14%,产气量增加8.2%。The 120 Ah lithium iron phosphate battery was tested for thermal runaway in a sealed pressure chamber in an inert atmosphere.The body temperature and ambient temperature of the battery were recorded,the proportion of gas production components was analyzed,and the gas production,exhaust rate and flammability limit of the battery were calculated.As a control,experiments were carried out under the same conditions in the air atmosphere to investigate the influence of different atmospheres on the thermal runaway process of the battery.The process of battery thermal runaway goes through several stages of"temperature rise-valve opening-thermal runaway-cooling down".During thermal runaway,the ambient temperature above the battery decreases gradually.Compared with the inert atmosphere,the temperature of the battery in the air atmosphere is increased by 17.6%,the thermal runaway duration is extended by 14%,and the gas production is increased by 8.2%.

关 键 词：磷酸铁锂电池 热失控 产气组分 可燃极限 测试气氛 

分 类 号：TM912.9[电气工程—电力电子与电力传动]