绝热条件下280 Ah大型磷酸铁锂电池热失控特性分析

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 T1 was 70.26 ℃, the thermal runaway trigger temperature T2 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.

Keywords： lithium iron phosphate battery ; thermal runaway ; adiabatic environment ; temperature characteristic parameters ; kinetic parameters