The difficulties of laser welding machine in the application field of prismatic aluminum shell battery

At present, square aluminum shell batteries account for a large proportion of the entire power battery, and during the welding process, due to the particularity of the aluminum alloy shell, problems such as bulges and pores appear during the welding process, especially in the corners.

Maintenance and precautions of laser welding machine

1. Battery raw materials

The outer casing of the power battery is made of aluminum alloy, which has the characteristics of easy forming, high temperature resistance, corrosion resistance, and electrical conductivity. The main problem with laser welding of aluminum alloys is that aluminum alloys are difficult to perform due to their high emissivity and high thermal conductivity.

2. Welding method

The thickness of the square battery case is usually less than 1 mm, and the mainstream is 0.6 mm and 0.8 mm, while the laser welding square power battery case mainly includes side welding and top welding. It will penetrate into the shell, but there will be protrusions during the welding process, which will affect the subsequent processing process; the top welding is carried out on a plane, and there are high requirements for the shell entry and positioning of the previous process, which requires a lot of High degree of automation.

3. Difficulties in welding

In the laser welding of aluminum materials, because the diameter of the optical fiber is too small, or because the setting of the laser power is too high, problems such as bulges, pores and air bubbles will appear. There are many factors that affect the spatter, including the characteristics of the material itself, The cleanliness of the material, etc., and the stability of the laser is the main factor affecting the laser.

In production and assembly, the welding technologies of square aluminum-shell lithium batteries mainly include: soft joints and cover welding of cells, welding of sealing nails, etc. Therefore, the selection of laser welding equipment should be customized according to the welding process requirements. Huiyao Laser can provide users with free proofing and laser welding program design, which can truly meet the needs of users for welding.

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