摘要
文章从磷酸铁锂电池组热失控危险特性出发,通过试验研究32650型磷酸铁锂电池单体热失控特征及其电池组间热失控传播过程。探究利用液氮喷淋阻断电池组间热失控传播,分析液氮对磷酸铁锂电池的防灭火效能。结果表明:单体锂电池热失控可划分为被动加热、安全阀泄压、自反应、喷射火、明火熄灭等5个阶段,单体电池温度变化曲线呈倒“V”形。液氮可有效阻断电池组间的热失控传播,能够大幅降低喷射火阶段的电池峰值温度。且喷淋时间越长,阻止电池组热失控传播越明显。30 s液氮喷淋条件下,除电池A1外,其他电池未进入安全阀泄压阶段。
This study started from the thermal runaway hazard characteristics of lithium-iron phosphate battery packs,experi⁃mentally study the thermal runaway characteristics of the 32650 LiFePO4 battery and its thermal runaway propagation process be⁃tween battery packs.Explore the use of liquid nitrogen spraying to extinguish the thermal runaway propagation between battery packs,and analyze the fire prevention and extinguishing effective⁃ness of liquid nitrogen on lithium⁃ion batteries.The experimental results show that the thermal runaway stage of monomer lithium battery can be divided into five stages:passive heating stage,initial explosion stage,self⁃reaction stage,explosion stage and nega⁃tive combustion stage.The temperature change curve of mono⁃mer battery is inverted"V"shape.Liquid nitrogen can effectively extinguish the thermal runaway propagation between battery packs and greatly reduce the peak temperature of the explosive battery.And the longer the spraying time,the more obvious to prevent the spread of thermal runaway battery group.With 30 s liquid nitrogen spraying,except for battery A1,no safety value pressure relief occured in other batteries.
作者
张媛媛
张志伟
赵子明
张国维
Zhang Yuanyuan;Zhang Zhiwei;Zhao Ziming;Zhang Guowei(Shenzhen Institute,China University of Mining and Technology,Guangdong Shenzhen 518000,China;School of Safety Engineering,China University of Mining and Technol-ogy,Jiangsu Xuzhou 221116,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第2期156-161,共6页
Fire Science and Technology
基金
国家重点研发计划(2022YFC3090503)
深圳市基础研究面上项目(JCYJ20220530164601004)。
关键词
磷酸铁锂电池
热失控
液氮
冷却降温
lithium-iron phosphate battery
thermal runaway
liq⁃uid nitrogen
cooling and annealing
