文献类型：期刊文献

英文题名：The influence of external short-circuit durations on the performance and thermal runaway risk of lithium-ion battery under critical C-rate conditions

作者：An, Zhoujian Wang, Linhui Du, Xiaoze Pea, Hamir Johan Mombeki Ding, Yong Zhang, Dong Fu, Jian

第一作者：An, Zhoujian

通信作者：An, ZJ[1];Du, XZ[1]

机构：[1]Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China;[2]Guizhou Inst Technol, Sch Aerosp Engn, Guiyang 550025, Peoples R China;[3]Shouhang High Tech Energy Technol Co Ltd, Jiuquan 735000, Peoples R China

第一机构：Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China

通信机构：corresponding author), Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China.

年份：2025

卷号：135

外文期刊名：JOURNAL OF ENERGY STORAGE

收录：;EI(收录号：20253619111151);Scopus(收录号：2-s2.0-105014941711);WOS:【SCI-EXPANDED(收录号:WOS:001569002300002)】；

基金：This work was financially supported by the National Natural Science Foundation of China (52206087; 52130607); the Youth Doctor Foundation Project of Gansu Provincial Education Department (2025QB-027); the Lanzhou Youth Science and Technology Talent Innovation Project (2024-QN-18); the Science and Technology Project of Gansu province (25CXGA058); the Industrial Support Plan Project of Gansu Provincial Education Department (2025CYZC-034); the Guizhou Provincial Basic Research Program (Natural Science) (MS [2025] 189); the Doctoral Research Funds of Lanzhou University of Technology (061907) and the Red Willow Excellent Youth Project of Lanzhou University of Technology.

语种：英文

外文关键词：External short circuit; Lithium-ion battery; Critical short-circuit time; Potential thermal risk; Capacity fading; Internal resistance

摘要：This research investigates the impact of external short-circuit times on the behavior of NCM pouch lithium-ion batteries under critical conditions, especially with a 20C-rate short-circuit current. The study aimed to analyze the potential thermal safety risks associated with batteries subjected to short-circuits. The results revealed that when the short-circuit duration was less than 40s, the appearance of batteries showed minimal changes with only slight cracking observed in the tab area. However, both temperature rise and capacity degradation were highly correlated with the duration of the short-circuit. Batteries subjected to longer initial short-circuit times (20s and 30s) experienced significant temperature increases, reaching levels near the defined threshold for thermal runaway, as well as up to 20 % capacity fading. Capacity and internal resistance cycle tests further demonstrated that the ohmic and polarization internal resistance increased with longer short-circuit durations. To investigate thermal runaway in more detail, a secondary short circuit was applied to the batteries that had previously undergone short-circuits. The results showed that the rate of temperature rise and the voltage drop were significantly higher in the secondary short-circuit tests compared to the initial short-circuit process. Scanning electron microscope (SEM) images of the secondary short-circuited batteries revealed that electrolyte decomposition, loss of active material, and the accumulation of internal stress led to separator closure and structural damage to both the positive and negative electrodes. These factors contributed to the significantly higher thermal safety risks observed in the short-circuited batteries during subsequent use compared to fresh batteries.