【作者】 张守芹； 袁文静； 黄荣； 耿兆杰； 纪常伟； 张永跃； 穆宝； 刘磊；

【Author】 Zhang Shouqin;Yuan Wenjing;Huang Rong;Geng Zhaojie;Ji Changwei;Zhang Yongyue;Mu Bao;Liu Lei;Beijing Automotive Technology Center Co.,Ltd;Beijing Electric Vehicle Co.,LTD;Beijing University Of Technology;

【机构】 北京汽车研究总院有限公司； 北京新能源汽车股份有限公司； 北京工业大学；

【摘要】 伴随新能源汽车退役期来临,为确保全生命周期内锂离子电池的安全状态处于可控范围,掌握老化锂电池充电过程的热危险性变得尤为重要。本文选用三种不同老化程度的三元锂离子电池,从电池老化衰减机理、电池过充热安全、安全度等维度开展理论与试验研究,通过电池的容量增量情况、过充热安全特征参数、安全状态评估等,探究动力电池不同老化程度过充热安全性,结果表明,老化程度高的电池在出现过充滥用情况时更易发生短路,基于新提出的电池安全度评估方法,首次耦合电压和温度进行安全度评估,电池安全度数值低于0.4时,表明电池已达到危险程度,且安全度信号可以比传统的电信号至少提前107s被检测到,从而在TR触发之前为逃生和救援提供更多的时间。更多还原

【Abstract】 With the advent of the retirement period of new energy vehicles,in order to ensure that the safety status of lithium-ion batteries in the whole life cycle is in a controllable range,it has become particularly important to grasp the thermal hazards of aging lithium batteries,especially the safety in the battery charging process.In this paper,three kinds of batteries without aging degree are selected,and theoretical and experimental studies are carned out from the dimensions of battery aging attenuation mechanism,battery overcharge heat safety,and safety degree.Based on the newly proposed battery safety assessment method,when the battery safety value is lower than 0.4,it indicates that the battery has reached a dangerous level,and the safety signal can be detected 78 s earlier than the traditional electrical signal,so as to provide more time for escape and rescue before the TR is triggered.更多还原