摘要
为研究锂离子电池内部短路引起潜在热失控风险的机理和规律,针对228 Ah矿用锂离子电池开展针刺诱导内部短路试验,通过分析电压、温度和重量损失率等参数,探明针刺速度、荷电状态(SOC)对热失控的影响和变化规律。研究结果表明:低速穿透时,因固体电解质界面膜的损坏与再生造成2次内部短路,温度和电压具有正相关性特征;随针刺速度的增加,电压下降起始时间和重量损失率变小,温升率基本不变;低SOC针刺时,内部短路影响电池热量的释放,改变短路放电的方式,随着SOC的增大,参与内部短路反应的活性物质越多,内部短路的现象明显、热失控严重,导致开路电压下降率、温升率和重量损失率均变大。研究结果可为该类电池在煤矿井下安全应用提供技术支撑。
In order to investigate the mechanism and law of potential thermal runaway risk caused by internal short circuit of lithium-ion batteries,the nail penetration-induced internal short circuit tests were conducted for 228 Ah lithium-ion batteries used in mine,and the influence and variation law of the penetration speed and state of charge(SOC)on the thermal runaway were explored by analyzing the parameters such as voltage,temperature and weight loss rate.The results show that in case of low-speed penetration,the damage and regeneration of the solid-electrolyte interphase causes twice internal short circuit,and the temperature with voltage has a positive correlation characteristics.With the increase of nail penetration speed,the initial time of the voltage drop and mass loss rate decrease,but the temperature rise rate is basically the same.In case of low SOC nail penetration,the internal short circuit will not only affect the heat release from the cell,but also change the pattern of short circuit discharge.As the SOC increases,more active substances are involved in the internal short circuit reaction,the internal short circuit phenomenon is more obvious,and the thermal runaway is more serious,which leads to the increase of open-circuit voltage drop rate,temperature rise rate,and mass loss rate.The research results can provide scientific basis for the safe application of this kind of batteries in underground coal mine.
作者
封居强
蔡峰
伍龙
黄凯峰
窦元运
FENG Juqiang;CAI Feng;WU Long;HUANG Kaifeng;DOU Yuanyun(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of Mechanical and Electrical Engineering,Huainan Normal University,Huainan Anhui 232038,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei Anhui 230009,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第10期81-87,共7页
Journal of Safety Science and Technology
基金
深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC21KF23)
华能集团总部科技项目(HNKJ21-HF07)
淮南市科技计划项目(2021A249)。
关键词
矿用锂离子电池
针刺速度
荷电状态
内部短路
lithium-ion battery used in mine
nail penetration speed
state of charge
internal short circuit