电化学（中英文）2024，Vol.30Issue(8)：28-35,8.DOI:10.61558/2993-074X.3454
不同荷电状态18650 LiFePC4电池的排放气体燃爆特性数值分析
Numerical Analysis of Explosion Characteristics of Vent Gas From 18650 LiFePO4 Batteries With Different States of Charge
摘要
Abstract
The combustion and explosion characteristics of lithium-ion battery vent gas is a key factor in determining the fire hazard of lithium-ion batteries.Investigating 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 batteries.Based 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"elimination"method,and the Chemkin-Pro software is used to numerically simulate the laminar flame speed and adiabatic flame temperature of the battery vent gas.And 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 gas.The study found that the 100％SOC battery has the lowest explosion limit of the vent gas.The inhibitory elementary reaction sensitivity coefficient in the reaction system is lower and the concentration of free radicals is higher.Therefore,it has the maximum laminar flame speed and adiabatic flame temperature.The com-bustion 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 battery.This 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 gas.It provides references for the safety of storage and transportation of lithium-ion batteries,safety protection of energy storage stations,and the selection of related fire extinguishing agents.关键词
燃爆特性/爆炸极限/层流火焰速度/绝热火焰温度/敏感性分析Key words
Combustion and explosion characteristics/Explosion limit/Laminar flame speed/Adiabatic flame tem-perature/Sensitivity analysis引用本文复制引用
王世林,龚旭,刘丽娜,李奕彤,张宸语,许乐俊,冯旭宁,王淮斌..不同荷电状态18650 LiFePC4电池的排放气体燃爆特性数值分析[J].电化学（中英文）,2024,30(8):28-35,8.基金项目
This work was supported by the National Natural Science Foundation of China(52106284)and the Natural Science Foundation of Hebei Province(B2021507001).The first author would also like to acknowledge the support of Project to Promote Inno-vation in Doctoral Research at CPPU(BSKY202302). （52106284）
