Battery pack box body and battery pack with same

Abstract

The invention discloses a battery pack box body and a battery pack with the same. The battery pack box body is characterized by comprising a lower box body, an upper cover arranged at the upper end ofthe lower box body, installation parts arranged on the periphery of the lower box body and a battery containing cavity formed between the lower box body and the upper cover, the lower box body comprises a frame and a spliced bottom plate arranged in the frame, and the frame comprises a first main beam and a second main beam which are vertically arranged; a first connecting part matched with the spliced bottom plate is arranged on the inner side of the first main beam; and a second connecting part matched with the spliced bottom plate is arranged on the inner side of the second main beam. Thebattery pack box body has the advantages of being good in weldability, high in structural strength, easy to expand and the like, the energy density of the system is improved while the safety of the battery system is guaranteed, and the lightweight requirement of the system is met.

Description

technical field [0001] The invention relates to the technical field of battery module processing, more specifically, it relates to an aluminum alloy tailor-welded battery pack box body and a battery pack with the box body. Background technique [0002] At present, there are three main forms of battery pack boxes: sheet metal boxes, aluminum alloy die-casting boxes, and extruded profile tailor-welded boxes. Sheet metal boxes have low cost, high strength, and good mechanical properties, but their weight is high, which limits their large-scale application. [0003] The aluminum alloy die-casting box has good structural strength and good sealing performance. However, due to the limitation of the die-casting process and the large area of ​​the battery pack chassis, the thickness of the box is generally required to be greater than 4mm, and there is a large margin in the strength design. The effect of light weight is not obvious. The profile cavity of the aluminum profile tailor ...

AI Technical Summary

Problems solved by technology

Sheet metal boxes have low cost, high strength, and good mechanical properties, but their weight is high, which limits their large-scale application

[0003] The aluminum alloy die-casting box has good structural strength and good sealing performance. However, due to the limitation of the die-casting process and the large area of ​​the battery pack chassis, the thickness of the box is generally required to be greater than 4mm, and there is a large margin in the strength design. The effect of light weight is not obvious

The profile cavity of the aluminum profile tailor welding scheme adopts the extrusion process, which can realize a thin-walled structure with a wall thickness of less than 1.5mm, which has great advantages in lightening the structure, but has insufficient welding strength, poor sealing performance, and low reliability, etc. Defects limit its further application

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