摘要
为了研究隧道内纵向通风对锂电池燃烧特性和烟气温度分布的影响,在缩尺寸隧道空间内开展了风速为0~1.5 m/s的单节、4节和9节18650型锂电池组的一系列热失控试验,同时开展了无风环境下开敞空间的单节、4节、9节试验,分析了热失控现象、特征火焰长度、质量损失、热失控温度、隧道烟气温度分布的变化规律。结果表明:随着风速增加。锂电池热失控最大特征火焰长度和最大喷射火焰温度增加;受限空间中锂电池热失控最大特征火焰长度和最大喷射火焰温度均小于开敞空间;热失控时火源附近烟气温度出现明显峰值,距火源较远处烟气温度波动较小,随着风速增加,距火源较远处下游烟气温度高于上游;锂电池烟气纵向温度分布符合指数衰减,试验数据与预测数据符合良好,单节、4节、9节电池临界风速分别为0.93、1.83、2.05 m/s。
In order to study the effect of longitudinal ventilation on the combustion characteristics and smoke temperature distribution of lithium batteries in tunnels,a series of thermal runaway tests of single,four and nine 18650-type lithium battery packs with longitudinal ventilation wind speed of 0~1.5 m/s were carried out in the tunnel space to analyze the regularities of the experiment phenomenon,meanwhile,single,four,and nine 18650-type lithium battery packs experiments in a windless environment were carried out in the open spaces,and the change rules of thermal runaway phenomenon,characteristic flame length,mass loss,thermal runaway temperature,and tunnel smoke temperature distribution were analyzed.The results show that:The maximum characteristic flame length and maximum jet flame temperature of the lithium battery thermal runaway increase with the increase of wind speed;the maximum characteristic flame length and maximum jet flame temperature of the lithium battery thermal runaway in the confined space are smaller than those in the open space.The temperature of the smoke near the fire source has a significant peak,and the temperature of the smoke at the distance from the fire source fluctuates less.With the increase of the longitudinal ventilation wind speed,the temperature of the downstream smoke is higher than that of the upstream at the distance from the fire source.The longitudinal temperature distribution of the lithium battery smoke is in line with the exponential decay,and the experimental data are in good agreement with the predicted data,the critical wind speed of single,four,and nine lithium battery packs were 0.93 m/s,1.83 m/s,and 2.05 m/s.
作者
高云骥
雷子健
孙澳
张玉春
Gao Yunji;Lei Zijian;Sun Ao;Zhang Yuchun(Faculty of Geosciences and Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《消防科学与技术》
北大核心
2025年第6期764-770,共7页
Fire Science and Technology
基金
国家自然科学基金(52478415)
四川省科技计划项目(2023YFS0407)。
关键词
安全工程
锂离子电池
隧道
纵向通风
电池规模
热失控
safety engineering
lithium-ion batteries
tunnel
longitudinal ventilation
cell size
thermal runaway
作者简介
高云骥,西南交通大学地球科学与工程学院副教授,博士,主要从事地下空间火灾防控、火灾蔓延及灾变动力学研究;通信作者:张玉春,西南交通大学地球科学与工程学院教授,博士,主要从事隧道及地下空间火灾防治、应急救援技术、智慧消防研究,zycfire@swjtu.edu.cn。
