储能科学与技术2025，Vol.14Issue(2)：636-647,12.DOI:10.19799/j.cnki.2095-4239.2024.0764
100Ah磷酸铁锂软包电池的热失控特性及产气行为
Thermal runaway characteristics and gas generation behavior of 100 Ah lithium iron phosphate pouch cell
摘要
Abstract
This study focuses on 100 Ah lithium iron phosphate pouch cells,triggering thermal runaway by side heating.By utilizing industry characterization tools such as Industrial Computer Tomography,Scanning Electron Microscopy,and Gas Chromatography,the thermal runaway characteristics and gas evolution patterns at 40%,60%,80%,and 100%SOC were systematically analyzed.The results show that the overheating trigger of battery thermal runaway can be subdivided into four stages:increased overheating temperature;by-product reaction gas expansion;separator shrinkage and cracking with smoke emission;and thermal runaway caused by severe temperature rise and gas production.Further calculation of heat generation energy revealed that at 100%,80%,60%,and 40%SOC,the peak heat generation rates reached 140.34,115.44,14.76,and 3.91 kW,respectively,and the energy released at 100%SOC is equivalent to 104.63 grams of TNT,with a destructive radius reaching 5.90 meters,representing nearly a 64.3%increase in hazard compared to that at 40%SOC.Characterization of battery materials post-thermal runaway indicated that the LFP cathode material transformed from a block shape to aggregated irregular spheres,and the graphite anode structure was transformed from layered to aggregated spherical particles due to accentuated internal side reactions.A comparison of gas evolution characteristics showed that with increased SOC,the amount of H2 produced by the battery increased,while the amount of CO2 decreased.The explosion risk of the gases produced at various SOC levels is higher than that of Common hydrocarbon gases,with the explosion upper limit first decreasing and then increasing.The findings from this study provide a theoretical basis and practical guidance for the safety design of follow-up energy storage systems.关键词
大容量/热失控/磷酸铁锂软包电池/残骸特征/产气Key words
large capacity/thermal runaway/lithium iron phosphate pouch cell/debris characteristics/aerogenesis分类
能源与动力引用本文复制引用
叶锦昊,侯军辉,张正国,凌子夜,方晓明,黄思林,肖质文..100Ah磷酸铁锂软包电池的热失控特性及产气行为[J].储能科学与技术,2025,14(2):636-647,12.基金项目
国家自然科学基金(22078105). （22078105）
