【作者】 杨子昕； 张友群； 刘中宪； 郭佳涌； 杨旭； 喻成； 杨辉前； 张洪涛； 陈来；

【Author】 Yang Zixin;Zhang Youqun;Liu Zhongxian;Guo Jiayong;Yang Xu;Yu Cheng;Yang Huiqian;Zhang Hongtao;Chen Lai;Deepal Automobile Technology Co.,Ltd.;School of Materials Science and Engineering,Beijing Institute of Technology;

【机构】 深蓝汽车科技有限公司； 北京理工大学材料学院；

【摘要】 锂离子电池在滥用条件下存在热失控风险,易发生燃爆事故,阻断热失控传播对于锂离子电池安全应用具有重要作用。本文以方形高比能147A·h三元锂离子电池为研究对象,使用了相变隔热材料、玻璃纤维气凝胶、玄武岩纤维气凝胶等不同种类的隔热材料来抑制电池组的热失控传播,探索了隔热材料的种类及厚度对热失控传播行为的影响,同时,还使用了商用热失控预警传感器对热失控传播进行监测预警。结果显示,2.5mm厚度的相变隔热材料和玻璃纤维气凝胶均不能阻隔热失控传播,使用2mm、2.5mm、3mm的玄武岩纤维气凝胶时,热失控传播能被有效阻止,下游电池后表面温升分别为134℃、185.9℃、102.5℃,且使用3mm玄武岩纤维气凝胶时,热失控传感器成功实现预警,下游电池依然具备正常循环放电能力。本研究对锂离子电池组的安全设计以及热失控传播阻隔技术开发提供了设计依据和理论指导。更多还原

【Abstract】 Lithium-ion batteries have the risk of thermal runaway under abusive conditions,which is prone to combustion and explosion accidents,and blocking thermal runaway propagation plays an important role in the safe application of lithium-ion batteries.In this paper,the square high specific energy 147 Ah ternary lithium-ion batteries as the research object,the use of phase change thermal insulation materials,glass fiber aerogel,basalt fiber aerogel and other different types of insulation materials to inhibit the thermal runaway propagation of the battery pack,to explore the type and thickness of the insulation materials on the thermal runaway propagation behaviour.At the same time,a commercial thermal runaway warning sensor was used to monitor the thermal runaway propagation.The results show that 2.5 mm thickness of phase change thermal insulation material and glass fiber aerogel can not block the thermal runaway propagation,the use of 2 mm,2.5 mm,3 mm basalt fiber aerogel,the thermal runaway propagation can be effectively prevented,the downstream battery rear suriace temperature rise of 134,185.9 and 102.5℃,respectively.When using 3 mm basalt fiber aerogel,the thermal runaway sensor successfully realized the early warning,and the downstream battery still had the normal cycle discharge capability.This study provides a design basis and theoretical guidance for the safety design of lithium-ion battery packs and the development of thermal runaway propagation barrier technology.更多还原