基于扭转刚度的电池包与车身集成设计研究

doi:10.19562/j.chinasae.qcgc.2023.ep.003

Abstract

Abstract:

The torsional stiffness of the body-in-white is an important mechanical performance index of the load-bearing body， which has a direct impact on the handling stability of the vehicle， and is also an important index to evaluate the lightweight level of the body. Since the new generation of pure electric body has a large structural frame difference from the traditional body， in the early stage of body design， the force transmission path is redefined with the goal of improving torsional stiffness. In this paper， based on theoretical analysis and topology optimization， the optimal force transmission path of the torsional stiffness of the body is found. Through the integrated design of the battery pack and the body， the body forms a plurality of closed structures that are close to a circular ring. On the premise of no extra weight adding to the car body t， the torsional stiffness of the body-in-white can reach 40，000 N·m/（°）， and the lightweight coefficient of the body can reach 1.75， achieving the leading level of pure electric vehicles， and at the same time greatly improving the handling stability of the vehicle.

Key words: torsional stiffness, the handling stability of vehicle, cyclic structure, topology optimization, cell to body

Yubo Lian,Bengang Yi,Yingying Cui,Hongsheng Tian,Junfei Yan,Chen Cheng. Research on Integrated Design of Battery Pack and Car Body Based on Torsional Stiffness[J].Automotive Engineering, 2023, 45(4): 647-653.

Figures/Tables 24

References 12

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车型		扭转刚度/（N·m·（°）^-1）			变化百分比/%
车型		带电池包	不带电池包	变化值	变化百分比/%
EV 宽包	A	31 835	19 691	-12 144	-38.15
	B	27 715	17 346	-10 369	-37.41
	C	31 510	20 620	-10 890	-34.56
	D	33 400	21 842	-11 558	-34.60
	E	30 140	19 326	-10 814	-35.88
EV 窄包	F	24 416	18 349	-6 067	-24.85
	G	25 806	19 704	-6 102	-23.65
	H	17 699	14 493	-3 206	-18.11

车型	扭转刚度	无后安装点	无前安装点	无侧边安装点
A	31 835	-6 708	-2 183	-4 300
B	27 715	-2 402	-2 175	-2 245
C	31 510	-6 400	-1 452	-1 789
D	33 400	-5 140	-1 426	-3 043
E	30 140	-4 450	-1 572	-2 913

Research on Integrated Design of Battery Pack and Car Body Based on Torsional Stiffness

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