Internal short circuit and dynamic response of large-format prismatic lithium-ion battery under mechanical abuse

IF 2.7 4区 工程技术 Q3 ELECTROCHEMISTRY
Shuai Jiang, Fangyuan Shi, Jie Li, Yongjun Pan, Honggang Li, Binghe Liu
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Abstract

Prismatic lithium-ion batteries (LIBs) are becoming the most prevalent battery type in electric vehicles, and their mechanical safety is garnering increased attention. Understanding the mechanical response and internal short circuit (ISC) of prismatic LIBs during dynamic impact is important for enhancing the safety and reliability of electric vehicles. Thanks to the pioneer's works on the cylindrical and pouch LIB, prismatic LIB can draw on relevant experimental and numerical modeling methods. However, there is still a lack of research on the dynamic effects of prismatic LIB in various loading directions. To address this disparity, the current research utilizes quasi-static and dynamic impact experiments on prismatic LIBs as a foundation. First, the mechanical response of a sizable prismatic LIB under quasi-static conditions and the dynamic effects are examined when subjected to mechanical abuse from various loading directions. Second, an anisotropic finite element model that considers dynamic strain rates are developed, enabling it to accurately represent the mechanical response to both quasi-static and dynamic impact loads. At last, we performed an analysis of ISC occurring under dynamic loading conditions combining the experimental and simulated results. The experimental results as well as the established model can provide reference for the safe design, application, and analysis of prismatic LIBs.
大型棱柱形锂离子电池在机械滥用下的内部短路和动态响应
棱柱形锂离子电池(LIB)正成为电动汽车中最常见的电池类型,其机械安全性也日益受到关注。了解棱柱形锂离子电池在动态冲击过程中的机械响应和内部短路(ISC)对于提高电动汽车的安全性和可靠性非常重要。得益于先驱们在圆柱形和袋状 LIB 方面的工作,棱柱形 LIB 可以借鉴相关的实验和数值建模方法。然而,关于棱柱形 LIB 在不同加载方向上的动态效应的研究仍然缺乏。针对这一差异,本研究以棱柱形 LIB 的准静态和动态冲击实验为基础。首先,研究了相当大的棱柱形 LIB 在准静态条件下的机械响应,以及在受到来自不同加载方向的机械冲击时的动态效应。其次,我们开发了一种考虑动态应变率的各向异性有限元模型,使其能够准确地表示准静态和动态冲击载荷下的机械响应。最后,我们结合实验和模拟结果,对动态加载条件下发生的 ISC 进行了分析。实验结果和建立的模型可为棱柱形 LIB 的安全设计、应用和分析提供参考。
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来源期刊
CiteScore
4.90
自引率
4.00%
发文量
69
期刊介绍: The Journal of Electrochemical Energy Conversion and Storage focuses on processes, components, devices and systems that store and convert electrical and chemical energy. This journal publishes peer-reviewed archival scholarly articles, research papers, technical briefs, review articles, perspective articles, and special volumes. Specific areas of interest include electrochemical engineering, electrocatalysis, novel materials, analysis and design of components, devices, and systems, balance of plant, novel numerical and analytical simulations, advanced materials characterization, innovative material synthesis and manufacturing methods, thermal management, reliability, durability, and damage tolerance.
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