锂离子电池多点内短路及物理场变化  

Multi-point internal short circuit and physical field variation of Li-ion battery

作　　者：陈明彪[1,2,3,4] 白帆飞 宋文吉 冯自平[1,2,3,4] CHEN Ming-biao;BAI Fan-fei;SONG Wen-ji;FENG Zi-ping(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou,Guangdong 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou,Guangdong 510640,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou,Guangdong 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;Foran Energy Group Co.,Ltd.,Foshan,Guangdong 528000,China)

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学院可再生能源重点实验室,广东广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广东广州510640 [4]中国科学院大学,北京100049 [5]佛燃能源集团股份有限公司,广东佛山528000

出　　处：《电池》2021年第2期131-134,共4页Battery Bimonthly

基　　金：国家自然科学基金(51806223);广东省自然科学基金(2019A1515011484,2020A1515010721);广东省新能源和可再生能源研究开发与应用重点实验室基金(Y909je1001,E039020101)。

摘　　要：建立电-热耦合的内短路模型,分析单点或多点触发内短路后且发生热失控前,锂离子电池电流场及温度场的变化。两点内短路与单点内短路相比,单层内短路电池和多层内短路电池的最大局部电流分别下降到65%和56%左右,最高局部产热率分别下降到43%和30%左右。电池在发生热失控前,对于单层两点触发内短路工况,内短路点越靠近极耳,通过内短路点的电流越大。减小远离极耳内短路点的电阻,可在一定程度上降低电池的最高温度。当监测到单层铝箔-负极形式内短路触发后,在发生热失控前强行刺穿所有电池层,有助于降低局部最高产热率。Thermal-electro coupled internal short circuit model was built to study the variation of current field and temperature field after the single-point or multi-point internal short circuit was occurred but before thermal runaway was occurred.Compared multi-point internal short circuit with single-point internal short circuit,the maximum local current of single-layer internal short circuit battery and multi-layer internal short circuit battery was dropped to about 65%and 56%,respectively,while the maximum local heat generation was dropped to about 43%and 30%,respectively.In the single-layer multi-point internal short circuit case before thermal runaway,the current through the internal short circuit point was bigger when the internal short circuit point was closer to tabs.The maximum temperature of battery was dropped when the resistance at the internal short circuit point,which was farther away from tabs decreased.In the case when single-layer aluminum-negative internal short circuit was occurred but thermal runaway wasn’t occurred,the local heat generation was dropped if all layers were forced to penetrate immediately.

关 键 词：锂离子电池 电-热耦合模型 内短路 极耳 热安全 

分 类 号：TM912.9[电气工程—电力电子与电力传动]