Friction stir welding welding process of a thin-walled battery tray

Abstract

The invention proposes a friction stir welding process for thin-walled battery trays, which includes designing a thin-walled battery tray structure; pre-welding at multiple points; designing a welding route, and using two-layer welding for welding; The outer beam is pressed down by the leading roller, and the four-layer welding method is used to carry out the stitch welding treatment; the air tightness test is carried out; the present invention can ensure the welding by performing multiple spot pre-welding treatment before welding and using the leading roller to press down the cover plate. At the same time, the thin-walled battery tray structure will not be arched, warped and open due to overheating of the air in the water channel. Using the front guide roller to lower the cover plate can also ensure the pressing force during welding and prevent the parts from shifting. By designing welding The route and welding sequence can prevent deformation or warping in one direction during welding. After the cover plate and the shell are welded together, a water channel of 7-10 meters can be provided, without the need for a single water-cooling plate, which saves the internal space and manufacturing of the battery tray. cost.

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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