Evaluation of the mechanical shock testing standards for electric vehicle batteries

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

The safety of Li-ion batteries (LIB) has become an important issue with the continuously increased use of electric vehicles (EV) in the world. In a survivable vehicle crash, when the vehicle needs to maintain structural integrity, crash-induced shock may damage EV's LIB. Therefore, an evaluation of commonly used mechanical shock test standards for EV battery module and pack is performed in this study against the crash-induced shock signals collected from National Highway Traffic Safety Administration (NHTSA) New Car Assessment Program (NCAP) tests. Various shock analysis methods including signal characteristics in time domain, power spectral density (PSD) and shock response spectrum (SRS) in frequency domain, and the acceleration/velocity-change diagram are used for the evaluation. It is found that most peak accelerations of NCAP shock signals significantly exceed the peak accelerations specified in shock testing standards. Crash-induced shocks cannot be fully represented by the half-sine pulse adopted in shock testing standards. In both time and frequency domains, the existing shock testing standards generally underestimate the severities of the crash-induced shocks, and therefore, are non-conservative. It also shows that the correct selection of a filter for the processing of the original crash-induced shock signal is crucial for the specification of EV battery shock environment and shock response analyses. The results obtained in this research can support the development of more reliable shock testing standards for EV batteries.

电动汽车电池机械冲击测试标准评估
随着电动汽车(EV)在全球使用量的不断增加,锂离子电池(LIB)的安全性已成为一个重要问题。在可存活的车辆碰撞中,当车辆需要保持结构完整性时,碰撞引起的冲击可能会损坏电动汽车的锂离子电池组。因此,本研究针对从美国国家公路交通安全管理局(NHTSA)新车评估项目(NCAP)测试中收集的碰撞诱发冲击信号,对电动汽车电池模块和电池组常用的机械冲击测试标准进行了评估。评估采用了多种冲击分析方法,包括时域信号特征、频域功率谱密度(PSD)和冲击响应谱(SRS)以及加速度/速度变化图。结果发现,大多数 NCAP 冲击信号的峰值加速度大大超过冲击测试标准中规定的峰值加速度。冲击测试标准中采用的半正弦脉冲不能完全代表碰撞引起的冲击。在时域和频域,现有的冲击测试标准普遍低估了碰撞诱发冲击的严重程度,因此是不保守的。研究还表明,正确选择滤波器来处理原始碰撞诱导冲击信号对于电动汽车电池冲击环境规范和冲击响应分析至关重要。本研究获得的结果可为制定更可靠的电动汽车电池冲击测试标准提供支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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