At present, laser welding has become an indispensable standard process in the production of power batteries, including welding of battery explosion-proof valve, sealing welding of battery shell and cover, welding of battery module and PACK, injection hole welding, series-parallel welding between battery packs, and dozens of other complex processes. Traditional laser technology can no longer meet the requirements of large-scale battery production for high safety and consistency. Due to the advantages of fiber lasers in improving efficiency, saving energy consumption, extending service life, providing precision and manufacturing technology, it has led to continuous innovation in the field of lithium battery manufacturing. However, the welding process of battery aluminum shells also has certain difficulties. Welding power battery aluminum shell with laser welding machine has some problems in the welding process.

Laser welding machine in welding power battery aluminum shell there are problems.

Stainless steel material development has a better laser welding technology performance, whether we use different pulses or can be continuous laser are able to get the ability to better appearance of the weld; aluminum alloy welding difficulty is also a relatively large impact, the production may lead to face the weld surface bulge, internal porosity, blowing fire and other problems. Aluminum alloy weld surface bulging and internal porosity problem research may be students due to our use of optical fiber core diameter is too small, laser energy management setting temperature is too high or welding speed growth is too fast, etc.; and caused by the weld at the blowout of the fire of a number of factors, such as the cleanliness of the material, material product purity itself, the material to improve their own characteristics, and so on.

Side welding process requires high stability of the laser and high cleanliness of the material, because bulging may occur during the welding process, which has little effect on the assembly of the subsequent process. However, since the top welding process is welding on the surface, it requires less integration of welding equipment and is simpler to produce in large quantities. However, there are two drawbacks, one is that the battery may have a small amount of spatter during the welding process, and the other is that the front-end processing requirements of the aluminum shell of the power lithium battery can lead to cost problems.

The general requirements of the power battery aluminum shell thickness of 1.0 mm or less, the current mainstream manufacturers according to the different battery capacity, mainly using 0.6 mm and 0.8 mm shell material. Welding methods are mainly divided into side welding and top welding, of which the main advantage of side welding is that it has little impact on the inside of the battery cell, and spatter will not easily enter the inside of the shell cover.

Laser welding of aluminum alloy is prone to problems such as protrusion, porosity, internal bubbles, etc., which are caused by the fiber core diameter being too small or the laser energy setting being too high. There are many factors affecting spattering, such as the characteristics of the material itself and the cleanliness of the material. Ruifeng photoelectric laser company focuses on 16 years of research and development technology and production, has many years of experience in the development of laser equipment, product technology is mature, product performance safety and stability. The company adheres to the "technological innovation, product innovation, service innovation" business philosophy, to provide customers with the best quality products and services.

The above is the laser welding machine in the process of welding power battery aluminum shell. When laser welding square aluminum shell power battery, laser welding operators need to select the appropriate laser and welding process parameters according to the battery thickness, tension and other factors to ensure that the welding effect meets the requirements of power battery manufacturers. When welding, corners are prone to problems, which can be solved by adjusting the welding speed according to the actual situation.

• welding power battery
• high stability
• Laser welding
• by Frances
• Sep 14,2023
• Topics
• 164

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