Friction stir welding process of thin-wall battery tray

Abstract

The invention provides a friction stir welding process of a thin-wall battery tray. The friction stir welding process comprises the following steps of designing a thin-wall battery tray structure; carrying out dotting and pre-welding at multiple positions; designing a welding route, and using a two-layer stitch welding mode to carry out welding treatment; deburring, installing an outer beam, pressing a front guide roller, and carrying out stitch welding treatment through adopting a four-layer stitch welding mode; and carrying out air tightness detection. The dotting and pre-welding processingat multiple positions is performed before welding, and the front guide roller is used to press down a cover plate so that a thin-wall battery tray structure can be prevented from arching and warping during welding, and an expansion phenomenon caused by overheating of air in a water channel can be avoided. The front guide roller is used for pressing the cover plate downwards so that a pressing force during welding can be ensured and parts can be prevented from moving; through designing a welding route and a welding sequence, deformation or warping in one direction during welding can be prevented, the water channel of 7-10 m can be provided after the cover plate and a shell are welded in a stitch welding mode, a single water cooling plate is not needed, and an internal space and manufacturing cost of a battery tray are saved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a friction stir welding welding process of a thin-walled battery tray. Background technique [0002] At present, new energy vehicles have higher and higher requirements for the lightweight of the whole vehicle. The lightweight of the body is becoming more and more important for new energy vehicles. Among them, the lightweight of the new energy power system occupies a large part in the lightweight of the entire body. The lightweight design of the power system with large specific gravity mainly includes the lightweight and compactness of the battery module pack, and the new energy vehicle battery tray is the main way to reduce the weight of the battery module pack, so the development of high-strength, light specific gravity materials, structural design Optimization is that the battery tray is the main direction in the future; [0003] At present, battery trays are mostly made of ...

AI Technical Summary

Problems solved by technology

[0003] At present, battery trays are mostly made of steel or aluminum profiles. The trays made in this way have a large overall weight and many welds. It is difficult to meet the requirements of automobile OEMs for light weight and connection strength. Stamping the battery tray can greatly reduce the overall weight of the tray. It only needs to install internal and external reinforcement beams at the stress-bearing parts to achieve higher strength, and the cover plate can be welded on the tray to form a water-cooling channel. The battery tray produced in this way is light in weight and strong. High, good impact resistance, and low cost, the thin-walled battery tray welded by the existing thin-walled battery tray welding process will appear arching, warping, swelling and other phenomena, the welding quality of the thin-walled battery tray is not high, The welding of thin-walled battery trays needs a more optimized process plan to ensure the welding quality. Therefore, the present invention proposes a friction stir welding welding process for thin-walled battery trays to solve the shortcomings of the existing technology

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