Battery shell runner partition welding process based on harmonica-shaped sectional material

Abstract

The invention discloses a battery shell runner partition welding process based on a harmonica-shaped sectional material. The battery shell runner partition welding process based on the harmonica-shaped sectional material comprises the following steps of fixing the harmonica-shaped sectional material to be welded on a workbench, machining rib positions of the sectional material according to the design, and ensuring that the machined rib positions have no residues; placing a partition structure at a position to be welded according to the design, accurately positioning, and ensuring that the partition structure is tightly matched with the upper side and the lower side of a runner; adopting a friction stir welding head with the fusion depth not smaller than 2 mm for welding the partition structure, so that an auxiliary hole formed after welding is reserved in the middle of the partition structure; performing auxiliary hole repair welding and two-end plug welding operation on the sectional material welded with the partition structure so as to obtain a shell primary finished product; and carrying out an air tightness test on the shell primary finished product, obtaining a shell finished product if the test passes, otherwise, carrying out repair welding on the leakage position. The battery shell runner partition welding process based on the harmonica-shaped sectional material has the remarkable effects that the one-time passing rate of a product air tightness test is greatly improved, and the thermal deformation is not obvious.

Description

technical field [0001] The invention relates to the technical field of new energy auto parts processing, in particular to a welding process for blocking flow channels of battery casings based on harmonica-shaped profiles. Background technique [0002] At present, automotive power batteries are basically composed of the following systems: battery modules, battery management systems, thermal management systems, electrical and mechanical systems. Among them, the battery thermal management system is a set of management systems used to ensure that the battery system works within a suitable temperature range from the perspective of use. It is mainly composed of shells, heat transfer media, monitoring equipment and other components. The cooling performance of the power battery directly affects the efficiency of the battery, and also affects the battery life and safety. At present, there are four conventional cooling methods: natural cooling, forced air cooling, liquid cooling, and...

AI Technical Summary

Problems solved by technology

[0004] However, after the above-mentioned process uses friction welding to weld the partition, it needs to use argon arc welding to repair the process hole of friction welding, but argon arc welding will cause the repair welding position to be heated and deformed, and the repair welding position will leak when it enters the site during the airtight test. Requires multiple repair welds

Repeated repair welding will further aggravate the thermal deformation, and even lead to the scrapping of the whole board

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