The experimental investigation of thermal runaway characteristics of lithium battery under different nitrogen concentrations

作者：Tao, Changfa; Zhu, Yunhao; Liu, Zhongqun; Li, Rui; Chen, Zhiyi; Gong, Lunlun^*; Liu, Jiahao^*

来源：Journal of Thermal Analysis and Calorimetry, 2023, 148(21): 12097-12107.

DOI：10.1007/s10973-023-12534-1

• Lithium-ion batteries
• Nitrogen concentration
• Battery surface temperature
• Mass loss
• Heat release rate

Thermal runaway (TR) is one of the main concerns in battery application due to their hazard level for the people and environment. In this work, the thermal runaway behaviors of lithium-ion batteries (LIBs) are investigated in ambient nitrogen (N2) concentration from 78 to 100%. Several parameters are measured to assess the fire hazards of LIBs, including battery surface temperature (Tsurf), ignition time (tig), total mass loss, heat release rate, and total heat release. The experimental results show that the risk of TR increases with the increase in state of charge. For different N2 concentrations, the addition of N2 will reduce oxygen (O2) concentration and weaken internal reactions, while excessive N2 will react with lithium-ion inside the LIBs. 82% N2 concentration shows the greatest inhibition effect on TR, where the values of battery surface temperature, total mass loss, heat release rate, and the total heat release reach the minimum ones.