摘要
针刺测试是研究锂离子电池热失效机理和热失控特性的重要方法之一。本文汇总了目前广泛采用的针刺测试设置,并研究了不同变量对热失控演化的影响,包括针刺的深度、速度、位置以及针的材料和直径等,对针刺破坏下锂离子电池内短路及热失控行为进行机理性探索与分析。结果发现,针刺的深度与电池热失控行为的严重程度成正比,针刺的速度对电池热失控没有明显影响,针刺发生在活性材料较密集或电极附近时电池热失控更严重。针的材料和直径对电池热失控行为具有双重影响,需要结合实际情况对产热和散热情况分别进行分析。最后通过总结不同因素对电池热失控的影响,对减缓锂离子电池热失控以及更新其安全测试程序提出了新的见解,为后续的创新型研究工作提供思路。
Nail penetration test is one of the most important meth-ods to investigate the failure mechanisms and thermal runaway features of lithium-ion batteries.This paper summarizes the nail penetration testing methods commonly used by researchers and studies the influence of different variables,including penetration depth,velocity,location,needle material and diameter,on the short-circuiting and thermal runaway behaviour in batteries under nail penetration-induced damage.The results reveal a direct pro-portionality between the depth of nail penetration and the severity of thermal runaway behaviour in batteries.The speed of nail pen-etration has no significant impact on thermal runaway.When nail penetration occurs in regions with dense active materials or near the electrode,the thermal runaway in batteries becomes severer.As for the variables related to the nail itself,such as material and diameter,they exhibit a dual effect on thermal runaway behaviour in batteries,requiring separate analysis of heat generation and dis-sipation considering the actual conditions.Finally,by summariz-ing the influence of various factors on thermal runaway in batter-ies,new insights are proposed to mitigate lithium-ion battery ther-mal runaway and update safety testing procedures,which can pro-vide guidance for subsequent innovative research work.
作者
张磊
刘彦辉
叶从亮
周钰鑫
黄鑫炎
Zhang Lei;Liu Yanhui;Ye Congliang;Zhou Yuxin;Huang Xinyan(Department of Building Environment and Energy Engi-neering,The Hong Kong Polytechnic University,Hong Kong 999077,China;The Hong Kong Polytechnic University Shen-zhen Research Institute,Guangdong Shenzhen 518057,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第5期597-604,共8页
Fire Science and Technology
基金
国家重点研发计划项目(2022YFE0207400)。
关键词
锂离子电池
针刺测试
热失控
内短路
电池安全
lithium-ion battery
nail penetration test
thermal run-away
internal short circuit
battery safety
