摘要
为探究不同外热功率(220,170,120,70 W)下锂离子电池的热失控特性,采用动压变温实验舱作为燃爆实验舱,并利用量热仪和ISO-9705烟气分析仪监测特征参数,对荷电状态(SOC)为100%的18650型锂离子电池进行高温热失控实验。结果表明:在不同的外热功率条件下,锂离子电池进入热失控的过程呈现出相似的趋势,但是各阶段的特性却存在差异。池体表面中心温度、HRR,THR和耗氧量均随外热功率的降低而降低。高外热功率下燃爆响应时间点明显提前,池体温度更高,220 W外热功率下,燃爆响时间点为176 s,池体温度为720.6℃,比70 W时提前366 s,高210.03℃,可见高外热功率时,电池热危害性更高。热解烟气CO的峰值体积百分比浓度随着外热功率的降低而升高,而CxHy的峰值质量百分比浓度降低,,CO_(2)的峰值体积百分比浓度降低。在70 W外热功率时,CO峰值体积百分比浓度高达0.322%,220 W时CO峰值体积百分比浓度仅为0.165%,说明低外热功率时,电池毒危害性更高。
In order to explore the thermal runaway characteristics of lithium-ion batteries under different external heat powers(220,170,120 and 70 W),the dynamic pressure and variable temperature experimental chamber was used as the combustion and explosion experimental chamber,and the characteristic parameters were monitored by the calorimeter and ISO-9705 flue gas analyzer.The high-temperature thermal runaway experiments of 18650 lithium-ion battery with 100%state of charge(SOC)were carried out.The results showed that under different external thermal power conditions,the process of lithium-ion battery getting into the thermal runaway presented a similar trend,but the characteristics of each stage were different.The surface central temperature,HRR,THR and oxygen consumption decreased with the decrease of external thermal power.Under the high external thermal power,the detonation response time point was obviously advanced,and the cell temperature was higher.At 220 W external thermal power,the detonation response time point was 176 s,and the cell temperature was 720.6℃,which was 366 s earlier and 210.03℃higher than that at 70 W.It could be seen that the thermal hazard of the battery was higher when the external thermal power was high.The peak concentration of CO in pyrolysis flue gas increased with the decrease of external thermal power,while the peak concentrations of CxHy and CO_(2) decreased.When the external thermal power was 70 W,the peak concentration of CO was as high as 0.322%,and the peak concentration of CO was only 0.165%at 220 W,which indicated that the toxic hazard of the battery was higher when the external thermal power was low.
作者
陈现涛
张旭
赵一帆
刘奕
CHEN Xiantao;ZHANG Xu;ZHAO Yifan;LIU Yi(College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan Sichuan 618307,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2021年第9期139-144,共6页
Journal of Safety Science and Technology
基金
国家重点研发计划项目(2018YFC0809500)。
关键词
外热功率
锂离子电池
热失控
热危害
毒危害
external thermal power
lithium-ion battery
thermal runaway
thermal hazard
toxic hazard
