绝热条件下280 Ah大型磷酸铁锂电池热失控特性分析

Analysis of thermal runaway characteristics of 280 Ah large LiFePO4 battery under adiabatic conditions

随着新能源产业的快速发展,锂离子电池在储能领域得到广泛应用。为了更好地防控储能电站火灾爆炸事故,需要对储能用磷酸铁锂电池的热失控特性进行更加深入的研究。本工作使用280 Ah磷酸铁锂电池进行绝热条件下电池热失控实验,得到自产热温度T1为70.26℃、热失控触发温度T2为200.65℃、热失控最高温度为340.72℃,热失控过程中出现两个温升速率峰值分别为3.59℃/s和1.28℃/s。同时定量分析了电池自产热阶段的动力学参数,电池热失控过程中释放的总热量为1511 kJ。最后分析了电池在绝热环境中破裂损坏的原因,是由于内部压力过大,反应较为剧烈所导致的。本工作研究内容弥补了280 Ah大型磷酸铁锂电池绝热条件下电池热失控特性研究的空白,对储能电站火灾爆炸事故具有理论指导意义。

With the rapid development of the new energy industry,lithium-ion batteries are extensively used in the energy storage field.To better prevent and control fire and explosion accidents in energy storage stations,the thermal runaway characteristic of lithium iron phosphate batteries for energy storage requires to be examined more thoroughly.In this study,under adiabatic conditions 280 Ah lithium iron phosphate battery thermal runaway experiment was performed,and the self-generated thermal temperature T_(1) was 70.26℃,the thermal runaway trigger temperature T_(2) was 200.65℃,and the maximum thermal runaway temperature was 340.72℃.Two temperature rise rate peaks of 3.59℃/s and 1.28℃/s occurred during the thermal runaway process.Meanwhile,the kinetic parameters of the battery were also quantified in the self-generated thermal phase,and the total heat released during the thermal runaway of the battery was 1511 kJ.Finally,the study analyzed the causes of battery rupture and damage in the adiabatic environment that was due to the high internal pressure and violent reaction.The research content of this study compensated the gap in the study of thermal runaway characteristics of 280 Ah large lithium iron phosphate battery under adiabatic conditions and has theoretical guidance importance for fire and explosion accidents in energy storage stations.