原文信息：
Coupling effect of state of charge and loading rate on internal short circuit of lithium-ion batteries induced by mechanical abuse
原文链接：
https://www.sciencedirect.com/science/article/abs/pii/S0306261924015216
Highlights
•给出了机械滥用过程的机械-电-热特征。
•综合SOC对ISC工艺的影响进行了研究。
•详细讨论了SOC和加载速率的耦合效应。
Research gap
目前较少研究关注SOC和加载速率对电池机械滥用诱发内短路过程的耦合影响。对此，作者以某商用三元锂离子电池为对象，探讨了四种初始SOC和三种加载速率作用对电池机械滥用过程中机械特性、电特性和热特性的耦合影响。
Abstract
A critical assessment of their mechanical safety involves the evaluation of mechanical-electrical-thermal characteristics of lithium-ion batteries during internal short circuits (ISCs) induced by mechanical abuse. This study comprehensively analyzes these characteristics under the coupling influence of state of charge (SOC) and loading rate. The findings reveal the “densificatio-n→fracture→secondary densification→secondary fracture” process of the battery at 1 mm/min loading rate. The separator assumes a pivotal role in shaping the fracture failure characteristics of the battery components. Besides, within conventional SOC, the ISC duration displacement increases with SOC increasing at 1 mm/min loading rate, while the slightly overcharged LIBs trigger thermal runaway rapidly. The results also present that coupled SOC and loading rate effects are present in the mechanical and electrical characteristics, while absence in the thermal characteristics. The battery performs the SOC dependence at 500 mm/min loading rate, but not at 1 mm/min and 60 mm/min loading rate. The variation of ISC duration time with SOC also differs at 500 mm/min loading rate compared to others. While the association between maximum temperature and SOC at different loading rates perform less variability. The insights derived from this study could contribute valuable theoretical guidance for the mechanical simulation of the battery and the design of the mechanically safe battery pack.
Keywords
Lithium-ion battery；
Mechanically safe；
Internal short circuit；
State of charge；
Loading rate；
Coupling effect；
Graphics
Fig. 1. Experimental devices and procedures of mechanical abuse test
Fig. 2. Mechanical-electrical-thermal characteristics and optical images of the ISC evolution process under mechanical abuse with 1 mm/min loading rate.
Fig. 3. SOC effect on electrical-thermal-mechanical characteristic of the batteries under mechanical abuse with 1 mm/min loading rate.
Fig. 4. The mechanical-electrical-thermal characteristics of the batteries under mechanical abuse with different loading rate. (a) The force-intrusion curves. (b) The voltage-time curves. (c) The temperature-time curves. (d) The peak force, failure intrusion, ISC duration time and maximum temperature rise rate of the batteries. (e)The optical images of the batteries.
Fig.5.Themechanical-electrical-thermal characteristics of the batteries with different SOCs at different loading rates. (a)-(c) At 1 mm/min loading rate. (d)-(f) At 60 mm/min loading rate. (g)-(i) At 500 mm/min loading rate.
作者简介
团队介绍：
本研究由哈尔滨工业大学汽车工程学院、哈尔滨工业大学电气工程与自动化学院的研究人员共同完成。
第一作者简介：
王灿，哈尔滨工业大学威海校区汽车工程学院硕士研究生，主要从事锂离子电池机械变形失效机理及损伤评估研究。发表SCI一区论文2篇，EI期刊论文1篇，荣获2023年研究生国家奖学金。
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