Thermal safety of ternary soft pack power lithium battery

doi:10.19799/j.cnki.2095-4239.2020.0122

Abstract

Abstract:

The frequent safety accidents of lithium-ion batteries have put forward higher safety requirements for battery manufacturers. Using the adiabatic environment provided by ARC, the 23 A·h soft-package NCM523 power lithium battery has been studied. During thermal runaway, thermal characteristic parameters change, temperature field distribution, and the evolution of thermal runaway. The thermal runaway trigger temperature of a 25% SOC battery is 22.68 ℃ lower than that of a 75% SOC battery. The maximum temperature T_m of a 75% SOC battery is 70.07 ℃ higher than that of a 25% SOC battery. The maximum temperature rise rate is 111.37 ℃/min. That is to say, the chemical reaction exotherm of the 75% SOC battery during thermal runaway is more severe and the thermal runaway is more destructive. During thermal runaway, the maximum temperature of the positive and negative electrodes of the 25% SOC battery are 385.5 ℃ and 342.7 ℃， respectively, and the positive temperature of the battery is higher than the negative temperature of 42.8 ℃; the maximum temperatures of the positive and negative electrodes of the 75% SOC battery are 508.8 ℃ and 365.8 ℃, respectively. The positive temperature of the battery is 143 ℃ higher than the negative temperature. The 25% SOC battery bulges obviously at 119.75 ℃; at 339.35 ℃, the battery generates a lot of thick smoke, the battery does not explode, and the damage is more serious after thermal runaway. The battery started to produce heat to the maximum temperature of thermal runaway, which took 5.125 h. When the 75% SOC battery is 171.06 ℃, a wide bulge appears near the positive electrode; after 4.77 min, a large amount of smoke is emitted between the positive and negative electrodes of the battery; within 1s, the battery emits flame, and the battery occurs The explosion, the combustion caused by the explosion lasted about 6.4 s, and the battery started to generate heat to the maximum temperature of thermal runaway for a total of 6.715 h.

Key words: electric vehicle, ternary soft pack lithium battery, safety, thermal runaway

CLC Number:

TM 911.3

Dong WANG, Lili ZHENG, Xichao LI, Guangchao DU, Yan FENG, Longzhou JIA, Zuoqiang DAI. Thermal safety of ternary soft pack power lithium battery[J]. Energy Storage Science and Technology, 2020, 9(5): 1517-1525.

Figures/Tables 1

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