摘要
随着锂离子电池在地下矿山的广泛应用,矿用电池安全问题日益突出。在不同过充电倍率(0.5 C、1 C、1.5 C)条件下对200 Ah的LiFePO_(4)/C电池单体以及电池模块进行过充电试验,研究了矿用大容量磷酸铁锂电池的热失控特性。结果表明:矿用磷酸铁锂电池的热失控行为分为壳体膨胀、缓慢烟气喷射、剧烈烟气喷射及后续自然降温等3个阶段;随过充电倍率增大,各阶段所需过充电电量逐渐减小;电池热失控后的温度最高可达400℃以上,且电池模块试验中的最高温度显著高于电池单体试验,高温将给地下矿山安全带来严峻挑战,需要进行相应的降温防护措施;电池模块中被过充电电池的热失控效应未引发相邻电池的热失控反应,矿用电池热失控连锁反应的临界条件还需进一步研究。
With the widespread application of lithium-ion batteries in underground mines,the safety issue of mining batteries has become increasingly prominent.The thermal runaway characteristics of large capacity lithium iron phosphate batteries for mining were studied by overcharging tests of 200 Ah LiFePO_(4)/C battery cell and battery module under different overcharging rates(o.5 C,1 C,1.5 C).The results show that the thermal runaway behaviors of the lithium iron phosphate batteries are divided into three stages:shell expansion,slow flue gas injection,and violent flue gas injection with subsequent natural cooling.As overcharging rate increases,the overcharged capacity required in each stage gradually decreases.The temperature after thermal runaway of the battery can reach up to more than 4oo C,and the maximum temperature in the battery module test is significantly higher than that in the battery cell test.High temperature will pose a severe challenge to the safety of underground mines,and corresponding cooling and protective measures need to be taken.The thermal runaway effect of overcharged battery in the battery module does not cause thermal runaway reactions of adjacent batteries.The critical conditions for the thermal runaway chain reaction of mining batteries still need further study.
作者
刘隽宁
郭爱军
许联航
LIU Junning;GUO Aijun;XU Lianhang(China Energy Shendong Coal Group Co.,Ltd.,Ordos,Inner Mongolia O17209,China)
出处
《矿业研究与开发》
北大核心
2025年第10期236-241,共6页
Mining Research and Development
关键词
地下矿山
矿用磷酸铁锂电池
热失控
过充电
高温防护
Underground mine
Lithium iron phosphate battery for mining
Thermal runaway
Overcharge
Hightemperatureprotection
