Manufacturing method of integral bent lap joint type frame

Abstract

The invention provides a manufacturing method of an integral bent lap joint type frame. The integral bent lap joint type frame comprises a ring beam assembly, a bottom plate and supporting rods, wherein the ring beam assembly is a closed ring which is formed by connecting a ring beam profile in a bent mode; the bottom plate is clamped in the ring beam assembly; and the supporting rods are used forconnecting and fixing the bottom plate to the ring beam assembly. The manufacturing method comprises the following steps that the ring beam profile with the preset length is machined into the non-connected and closed ring; the bottom plate is sleeved with the non-connected and closed ring; and the parts, close to the two ends, of the supporting rods are fixedly connected with the ring beam sectional material, and the middle parts at the two ends are connected with the bottom plate, so that the bottom plate is connected and fixed in the non-connected and closed ring by the supporting rods; andthe non-connected closed ring is closed and connected. According to the method, the processing is easy, the working hours are few, and the cost is low; and meanwhile, the ring beam assembly is obtained by bending the sectional material and then connecting and fixing the section at a time, the flatness is high, a machining tool is simple, and a plurality of complex tool clamps are not needed.

Description

technical field [0001] The invention relates to a shell of a battery pack of an electric vehicle, in particular to a method for manufacturing an integrally bent and lapped frame, and belongs to the field of mechanical structures. Background technique [0002] The casing of the existing electric vehicle battery pack usually includes an upper casing and a lower casing. The usual lower casing is required to have a Certain mechanical strength. [0003] The existing lower casing includes a frame beam and a bottom arranged in the frame beam, wherein the frame is used as the skeleton of the lower casing, and the bottom plate is used as a support to fill the whole frame and seal the bottom of the battery pack. [0004] Now a commonly used design is to use four sections of rods to weld and splice at the end to obtain a quadrilateral frame, and then fix the whole or multiple sheets to the frame. [0005] However, the above structure finds the following deficiencies in actual use: ...

AI Technical Summary

Problems solved by technology

[0006] 1. With multiple welding parts, the overall structural strength cannot be guaranteed, which will inevitably lead to different connection strengths of the four welding points;

[0007] 2. The quadrilateral obtained by welding cannot be guaranteed to be completely on the same plane, causing subsequent warping, which requires subsequent plastic processing before it can be used;

[0008] 3. There are many welding parts, the processing cost is high, and it is necessary to design the fixture to prevent deformation during welding according to different frame shapes, and the number of tooling fixtures is large, which increases the processing cost

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