摘要
为揭示气压条件对富镍锂离子电池热失控行为的影响,提出一种基于惰性气氛的试验分析方法,通过调控环境气压参数系统考察其对热失控过程的作用规律。选用容量为50 A·h的商用棱柱形电池,其阴极材料为Li(Ni_(0.5)Co_(0.2)Mn_(0.2))O_(2),阳极为石墨。在100%荷电状态(SOC)下,于1000 L定容锂电池试验舱AEC的氮气环境中开展热失控试验,设置初始气压分别为60、80和101 kPa,分析气压差异对热失控特性的影响。结果表明:安全阀开启瞬间,烟雾喷发速度约为40 m/s;随环境气压降低,喷发总历时缩短,表现为气压每下降20 kPa,喷射时间缩短约5 s;不同气压条件下的总产气量差异不显著,均保持在(2.04±0.15)L/(A·h)。研究揭示了环境气压对富镍锂离子电池热失控射流特性的影响规律,为进一步理解热失控过程的原始状态特征提供了试验依据,对电池热管理系统的优化设计具有一定的指导意义。
To reveal the influence of pressure conditions on the thermal runaway behavior of high-nickel lithium-ion batteries,a test analysis method based on an inert atmosphere was proposed.By regulating the environmental pressure parameters,the effect of pressure on the thermal runaway process was systematically investigated.A commercial prismatic battery with a capacity of 50 A·h was selected,featuring a cathode material of Li(Ni_(0.5)Mn_(0.2)Co_(0.2))O_(2)and a graphite anode.Thermal runaway tests were conducted in a 1000 L constant-volume lithium battery test chamber AEC filled with nitrogen at 100%state of charge(SOC).The initial pressures were set at 60,80,and 101 kPa respectively,to analyze the impact of pressure differences on the thermal runaway characteristics.The results showed that at the moment the safety valve opened,the smoke ejection speed was approximately 40 m/s.As the environmental pressure decreased,the total ejection duration shortened,with an average reduction of about 5 seconds for every 20 kPa drop in pressure.The total gas production under different pressure conditions was not significantly different,remaining at(2.04±0.15)L/(A·h).This study revealed the influence of environmental pressure on the jet characteristics of thermal runaway in high-nickel lithium-ion batteries,providing experimental evidence for understanding the initial state features of the thermal runaway process and offering guidance for the optimization design of battery thermal management systems(BTMS).
作者
魏宁宁
李明海
WEI Ningning;LI Minghai(ZhanTianyou College(CRRC College),Dalian Jiaotong University,Dalian 116028,China)
出处
《大连交通大学学报》
2025年第6期101-106,共6页
Journal of Dalian Jiaotong University
关键词
锂电池
热失控
温度
喷发
lithium-ion battery
thermal runaway
temperature
jet
