Lower shell of steel-aluminum hybrid battery pack

Abstract

The invention discloses a lower shell of a steel-aluminum hybrid battery pack. The lower shell comprises a frame structure, cross beams, longitudinal beams, bottom plates and middle lifting lugs; themiddle lifting lugs penetrates through the cross beams and the bottom plates from top to bottom and are fixed to the cross beams and the bottom plates, and each of the middle lifting lugs comprises amiddle lifting lug body of a cylindrical hollow structure, wherein the top end of the middle lifting lug body is matched with a middle lifting lug nut, and the lower end of the middle lifting lug bodyis sequentially installed in a middle lifting lug reinforcing plate and a middle lifting lug sleeve in a penetrating mode; the frame structure is formed by splicing four frames, the four frames are divided into two groups, and each group of frames are the same in structure and are oppositely arranged; the cross beams are formed by embedding an inverted U-shaped thin-wall structure with a lightening hole into an inverted T-shaped thin-wall structure with a lightening hole, and the frame structure is made of aluminum alloy; the cross beams, the longitudinal beams, the middle lifting lugs and the bottom plates are all made of steel. According to the invention, the advantages of aluminum alloy and high-strength steel are fully absorbed, the lightweight and low-cost design of the battery packbox body is realized, the welding deformation is small, the connection strength is high, and the processing efficiency is high.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a lower casing of a steel-aluminum hybrid battery pack. Background technique [0002] With the increasingly prominent environmental pollution and energy problems, the development of pure electric vehicles is an effective way to solve the above problems. Reducing the curb quality of electric vehicles, increasing the cruising range, and reducing product costs are key issues that urgently need to be solved in the promotion and application of pure electric vehicles. The weight of the battery pack accounts for about 30% of the curb weight of the electric vehicle, and the lower shell of the battery pack accounts for about 20%-30% of the weight of the battery pack. Therefore, it is of great significance to carry out the lightweight and low-cost structural design and manufacture of the lower shell of the battery pack for reducing the curb weight and cost of electric vehicles...

AI Technical Summary

Problems solved by technology

However, it is difficult to further reduce the manufacturing cost of the battery pack box by using a large number of aluminum alloy profiles, and the bottom plate of the battery pack and the reinforcing beam are only connected through the adhesive process. The structural adhesive is prone to aging and failure in harsh environments, which may cause Problems such as deterioration of the connection strength of the lower shell of the battery pack, and degradation of mechanical structure performance

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