Numerical Analysis of Explosion Characteristics of Vent Gas From 18650 LiFePO_(4) Batteries With Different States of Charge

作     者：Shi-Lin Wang Xu Gong Li-Na Liu Yi-Tong Li Chen-Yu Zhang Le-Jun Xu Xu-Ning Feng Huai-Bin Wang 王世林;龚旭;刘丽娜;李奕彤;张宸语;许乐俊;冯旭宁;王淮斌

作者机构：China People's Police UniversityLangfang 065000China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China 

出 版 物：《电化学（中英文）》 (Journal of Electrochemistry)

年 卷 期：2024年第30卷第8期

页      面：28-35页

学科分类：0808[工学-电气工程] 08[工学] 0837[工学-安全科学与工程] 

基　　金：supported by the National Natural Science Foundation of China(52106284) the Natural Science Foundation of Hebei Province(B2021507001) support of Project to Promote Innovation in Doctoral Research at CPPU(BSKY202302) 

主　　题：Combustion and explosion characteristics Explosion limit Laminar flame speed Adiabatic flame temperature Sensitivity analysis 

摘      要：The combustion and explosion characteristics of lithium-ion battery vent gas is a key factor in determining the fire hazard of lithium-ion *** the combustion and explosion hazards of lithium-ion batteries vent gas can provide guidance for rescue and protection in explosion accidents in energy storage stations and new energy vehicles,thereby promoting the application and development of lithium-ion *** on this understanding and combined with previous research on gas production from lithium-ion batteries,this article conducted a study on the combustion and explosion risks of vent gas from thermal runaway of 18650 LFP batteries with different states of charge(SOCs).The explosion limit of mixed gases affected by carbon dioxide inert gas is calculated through the“eliminationmethod,and the Chemkin-Pro software is used to numerically simulate the laminar flame speed and adiabatic flame temperature of the battery vent *** the concentration of free radicals and sensitivity coefficients of major elementary reactions in the system are analyzed to comprehensively evaluate the combustion explosion hazard of battery vent *** study found that the 100%SOC battery has the lowest explosion limit of the vent *** inhibitory elementary reaction sensitivity coefficient in the reaction system is lower and the concentration of free radicals is ***,it has the maximum laminar flame speed and adiabatic flame *** combustion and explosion hazard of battery vent gas increases with the increase of SOC,and the risk of explosion is the greatest and most harmful when SOC reaches 100%.However,the related hazards decrease to varying degrees with overcharging of the *** article provides a feasible method for analyzing the combustion mechanism of vent gas from lithium-ion batteries,revealing the impact of SOC on the hazardousness of battery vent *** provides references for the safety of storage and transportation of lithium