Lower shell of aluminum alloy battery pack

Abstract

The invention discloses a lower shell of an aluminum alloy battery pack. The lower shell comprises a frame structure, cross beams, a floor and a middle lifting lug. The frame structure is formed by splicing four frames with L-shaped sections, the two groups of cross beams have the same structure and are arranged in parallel, the shape of a cross section of one group of cross beams is inverted T, the shape of a cross section of the other group of cross beams is a step, and the two groups of cross beams and the L-shaped frames are overlapped by adopting male end and female end insertion structures and then are welded. The cross section of the floor is linear, and the floor is welded with the L-shaped frames and the cross beams after inserted connection. The middle lifting lug comprises a cylindrical middle lifting lug body of a hollow structure, the middle lifting lug body penetrates through the cross beams from bottom to top, a top of the middle lifting lug body is matched with a nut, and a circular ring piece penetrates through the middle lifting lug body from top to bottom and is fixed through MIG welding. According to the lower shell, the advantages of aluminum alloy are fully absorbed, the lightweight design of a battery pack box body is realized, the connection is reliable, the sealing performance is good, and the processing efficiency is high.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a lower casing of an aluminum alloy battery pack. Background technique [0002] With the increasing annual production and sales of automobiles, the problems of energy crisis and environmental degradation are becoming more and more serious. The development of electric vehicles is an important way to solve the above problems. However, the short cruising range is currently the primary problem restricting the development of electric vehicles. As one of the core components of an electric vehicle, the battery pack accounts for about one-third of the curb weight of the vehicle. Therefore, the lightweight design of the battery pack structure is of great significance for improving the target cruising range of electric vehicles. [0003] Existing battery packs mainly include three structural forms: steel battery packs, aluminum alloy die-casting battery packs and aluminum alloy ...

AI Technical Summary

Problems solved by technology

The existing technology has realized the lightweight of the lower case of the battery pack to a certain extent, but there are still shortcomings such as over-design, short weld life, complex profile cross-section, and high manufacturing cost.

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