Dynamic mechanical behaviors of load-bearing battery structure upon low-velocity impact loading in electric vehicles

IF 15 1区 工程技术 Q1 ENERGY & FUELS
Ruiqi Hu , Dian Zhou , Yikai Jia , Yang Chen , Chao Zhang
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引用次数: 0

Abstract

As the electrification trend of vehicles continues, new energy vehicles such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) are being equipped with new functional energy storage devices demanding a trade-off between electrical and mechanical property. Accordingly, composite-battery integrated structures which simultaneously carry mechanical resistance and energy-storage capacity, are being explored to offer great potential for the next generation of EVs or PHEVs. Herein, the dynamic responses and failure mechanisms of the integrated structure under the commonly occurring low-velocity impact events are studied both experimentally and numerically. A macro-scale finite element (FE) model was developed by implementing constitutive models of component materials, including lithium‐ion polymer (LiPo) battery cells, polymer foams, and carbon fiber-reinforced polymers (CFRP). The numerical method demonstrates good feasibility and accurately predicts impact behaviors, with the maximum error of the peak impact load not exceeding 8 %. The integrated structures are proven to reduce mechanical damage while maintaining mechanical and electrochemical performance within a range of impacts. The electrical and mechanical behaviors and their correlations were revealed. Sensitivity of the mechanical behaviors and electrical failure to battery arrangement were discussed as well as the structure design on energy absorption capacity. These results hold significant potential for the safety and lightweight design of energy storage composite structures incorporating lithium-ion batteries.

Abstract Image

电动汽车低速冲击加载时承重电池结构的动态力学行为
随着汽车电气化趋势的不断发展,电动汽车(EV)和插电式混合动力汽车(PHEV)等新能源汽车正在配备新的功能性储能装置,这些装置需要在电气性能和机械性能之间进行权衡。因此,同时具有机械阻力和储能能力的复合材料电池集成结构正在被探索之中,为下一代电动汽车或混合动力电动汽车(PHEV)提供了巨大潜力。本文通过实验和数值方法研究了集成结构在常见的低速冲击事件下的动态响应和失效机制。通过实施包括锂离子聚合物(LiPo)电池芯、聚合物泡沫和碳纤维增强聚合物(CFRP)在内的组件材料构成模型,建立了宏观尺度的有限元(FE)模型。该数值方法具有良好的可行性,能准确预测冲击行为,冲击载荷峰值的最大误差不超过 8%。经证明,集成结构可减少机械损伤,同时在一定冲击范围内保持机械和电化学性能。研究揭示了电气和机械行为及其相关性。还讨论了机械行为和电气故障对电池布置的敏感性,以及结构设计对能量吸收能力的影响。这些结果为结合锂离子电池的储能复合结构的安全性和轻量化设计提供了巨大的潜力。
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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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