Study on the Method of Structural Dynamic Modeling and Analyzing of the EV's Battery Pack

doi:10.3901/JME.2018.08.157

Abstract

Abstract: The EV's battery packs whose reliability and security performance directly determine the EV's normal operation mostly assembled into integration by battery cells, modules, shell, electrical connection components and management system, completing the charge and discharge function under the vibration and varying temperature environment. It's an urgent need to study on dynamic modeling and analyze of complicated battery packs and explore the dynamic response of internal fine structure and the whole integration during the developing and optimizing procedure of battery packs. The method of complicated battery packs systemic dynamic modeling and analyzing based on the cell's equivalent mechanical parameters and actual contact conditions is proposed. Combined with the development of a battery pack instance, each sub-model is established and under experimental verification. The optimum contact parameters are determined by optimization algorithm. The simulation results of mass-concentrated model, connection-simplified model and contact-considered model are compared to experimental result to verify the validity and accuracy of the model and the feasibility of the method. The random vibration responses of instance's internal key electrical contact points are achieved and show that different positions have big difference under a same vibration excitation and the responses are highly non-uniform distribution. The method of dynamic modeling and analyzing of bolt-connected battery pack is proposed and has practical significance to the design and safety analysis of the same type battery packs.

Key words: cell modeling, contact modal, dynamic analysis, EV's battery pack

CLC Number:

U469

LAN Fengchong, HUANG Peixin, CHEN Jiqing, LIU Jin. Study on the Method of Structural Dynamic Modeling and Analyzing of the EV's Battery Pack[J]. Journal of Mechanical Engineering, 2018, 54(8): 157-164.

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