储能科学与技术2024，Vol.13Issue(10)：3491-3503,13.DOI:10.19799/j.cnki.2095-4239.2024.0396
锂离子电池单层电芯内短路建模与热失控触发特性
Modeling internal short circuit and thermal runaway triggers in single-layer lithium-ion battery cells
摘要
Abstract
Internal short circuits(ISC)present significant challenges in lithium-ion batteries,underscoring the need for accurate simulation models to understand battery failure mechanisms.This study examines NCM/graphite batteries and develops a three-dimensional single-cell ISC model that includes exothermic side reactions with thermal runaway.By utilizing electrochemical-thermal coupling,the study investigates the triggers of thermal runaway and the progression of ISC-induced thermal runaway.Initially,the heat generation and reaction rates of four exothermic side reactions are calculated using the Arrhenius equation.The results indicate that the highest heat is produced by reactions between the negative electrode and the electrolyte.Additionally,an analysis of the thermal runaway triggering characteristics of four typical ISC forms within a single cell reveals that an internal short circuit involving an aluminum anode poses the greatest danger.The resistance value of the short circuit is positively correlated with the time it takes for thermal runaway to be triggered.Additionally,the area of the high-temperature hotspot at the critical short-circuit resistance is determined to be 30 mm2.This simulation identifies the critical short-circuit resistance values for four different ISC forms and reveals the internal lithium-ion concentration and temperature distribution when thermal runaway is triggered.These findings offer valuable theoretical insights for investigating ISC failure mechanisms and designing safe lithium-ion batteries.关键词
锂离子电池/单层电芯/内短路模型/热失控触发Key words
lithium-ion battery/single-layer cell/internal short circuit model/thermal runaway trigger分类
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乔亚军,任怡茂,谭子健,张袆柔,吴伟雄..锂离子电池单层电芯内短路建模与热失控触发特性[J].储能科学与技术,2024,13(10):3491-3503,13.基金项目
国家自然科学基金(52106244),广东省基础与应用基础研究基金(2024A1515030124,2022A1515011936),南方电网公司科技项目[GDKJXM20230246(030100KC23020017)]. （52106244）
