How much power does laser welding of batter box need?

In the production and assembly, the welding technology of the square aluminum boxes  lithium battery mainly includes: the welding of the flexible connector of the electric core and the cover plate, the welding of the sealing nail, etc. Therefore, the laser welding equipment shall be customized according to the welding process requirements, and the welding of square battery boxes  can be realized by selecting 1000W-2000W laser welding equipment.

Laser welding of square battery boxes  topsun laser There are mainly two types of com connection: top welding and side welding. Due to the particularity of aluminum alloy boxes , it has the characteristics of easy forming, high temperature resistance, corrosion resistance, conductivity, etc. The main problem of aluminum alloy laser welding is that aluminum alloy has high emissivity and high thermal conductivity, which makes it difficult to carry out. As a result, problems such as bulge and air hole are easy to occur in the welding process, especially at the corner. Shangtuo Laser can customize laser welding Industrial Control according to welding requirements, design tooling and fixtures for free, and realize automatic welding production.

Laser welding method for square lithium battery boxes :

The thickness of the square battery boxes  is usually less than 1mm, and the mainstream ones are 0.6mm and 0.8mm. The laser welding of the square power battery boxes  mainly includes side welding and top welding. The side welding has little impact on the inner part of the cell, and the spatter will not penetrate into the boxes , but there will be protrusions in the welding process, which will affect the subsequent processing process; The top welding is carried out on a plane, which requires a high degree of automation for the boxes  entry and positioning of the previous process.

The welding of square battery boxes  is mainly divided into two types: top welding and side welding. There is a rectangular cover plate with positive terminal on the top. The cover is inserted into the housing, and the upper port is flush. The rectangular gap between the cover and the housing is welded by laser, and the laser is welded repeatedly. Sealing, this welding process is called top welding.

In the top welding, the laser beam can be fixed and the Electric Power Transmission can be fixed on the workbench. After the laser beam is aligned with the weld, the worktable is activated so that the battery follows the same rectangular shape as the weld along the x and y coordinates of the worktable. When the cover plate of prismatic battery adopts the top welding sealing structure process, the cover plate does not need to be placed by positioning steps, and the length and size tolerance requirements are also strict, requiring high precision of welding components. Compared with the top welding process of power Extension Cords, the size tolerance of the upper cover during side welding is loose and easy to compact, which has obvious advantages. However, the workpiece needs to rotate during side welding, so the fixture is necessary, with high cost and low efficiency.

When the square battery is used for top welding, problems are easy to occur at the four corners. It is necessary to adjust the waveform, power and welding speed according to the actual situation. However, cylindrical laser welding does not have this problem. Typically, the cylindrical battery is held in three claws. Side welding is carried out on the chuck, but it is difficult to integrate the battery module in the later stage of the cylindrical battery.