摘要
为了研究磷酸铁锂电池爆阀后热失控的抑制效果,搭建了热失控特性检测试验平台。首先对电池热失控喷气进行阶段划分,然后对比分析了不同时机切断供电对磷酸铁锂电池热失控现象特性、温度和可燃气浓度特性的影响。结果表明:磷酸铁锂电池安全阀爆开后,存在2次喷气,时间间隔为10 s左右。当安全阀打开时,伴随少量气体的喷发,立即切断供电,内部反应随之停止,阀口并未出现第2次喷气。在第2次喷气后,电池进入完全热失控状态,若立即切断供电,电池表面温度长时间持续升高,最高温度为93℃。在第2次喷气2 min后再断电,电池表面温度持续升高至200℃,相较于第2次喷气时断电,最高温度差为107℃,H_2、CO的最大体积分数差为7.09×10~(-4)、3.28×10~(-4)。如果在安全阀开启瞬间不能立刻预警及干预,有效的预警应该在第1次喷气和第2次喷气之间动作,可以控制温度的上升和可燃气体的喷射,降低火灾爆炸风险。
In order to study the effect of thermal runaway suppres-sion after the rupture of lithium iron phosphate battery safety valves,an experimental platform for detecting thermal runaway characteristics was constructed.Firstly,the thermal runaway jet of the battery was divided into stages,and then the influence of cutting off power supply at different times on the phenomenon characteristics,temperature,and combustible gas concentration characteristics of thermal runaway was compared and analyzed.The results show that after the safety valve of the lithium iron phosphate battery is opened,there are two jettings,with a time interval of about 10 s.When the safety valve opens,accompanied by a small amount of gas ejection,the power supply is immedi-ately cut off,and the internal reaction stops accordingly,and there is no second ejection from the valve.After the second jet-ting,the battery enters a completely thermal runaway state.If the power is cut off immediately at this time,the surface temperature of the battery continues to rise for a long time,with the highest temperature reaching 93°C.If the power is cut off again 2 minutes after the second jetting,the surface temperature of the battery continues to rise to 200°C.Compared with cutting off the power during the second jetting,the maximum temperature difference is 107°C,and the maximum differences in H2 and CO volume frac-tion reach 7.09×10-4 and 3.28×10-4,respectively.In response to the thermal runaway warning after the safety valve opens,ef-fective warning and thermal runaway suppression methods should act between the first and second jettings,which can prevent the rapid rise of battery temperature,reduce the ejection of combus-tible gases,and reduce the risk of fire and explosion.
作者
陈书文
刘凯
宋振轩
吕娜伟
姜欣
金阳
Chen Shuwen;Liu Kai;Song Zhenxuan;Lv Nawei;Jiang Xin;Jin Yang(School of Electrical and Information Engineering,Zheng-zhou University,Henan Zhengzhou 450001,China;Zheng-zhou Fire and Rescue Detachment,Henan Zhengzhou 450046,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第5期687-692,共6页
Fire Science and Technology
关键词
锂电池
储能安全
热失控预警
火灾防控
热失控抑制
lithium-ion batteries
energy storage safety
thermal runaway warning
fire prevention and control
thermal runaway suppression
作者简介
陈书文(1997-),男,河南南阳人,郑州大学电气与信息工程学院硕士研究生,主要从事储能安全技术方面的研究,河南省郑州市中原区科学大道100号,450001,17335372036@163.com。
