In Lithium ion battery industry, laser welding machines are practical and useful equipment.
Laser welding machine for lithium ion battery and battery pack has promoted the development of lithium ion battery.
The procedures of making lithium ion batteries include explosion-proof valve sealing welding process, tab welding process, soft connection welding process, safety helmet spot welding process, battery shell sealing welding process, battery pack welding process.
At present, people have realized the importance of protecting environment. However, the traditional batteries are harmful to the earth after being used. Out of the reason of environment protection, the scientists invented lithium ion batteries. In particular, the emergence of lithium iron phosphate batteries has promoted the development of the lithium battery industry. Lithium ion batteries have a lot of advantages, including high energy, long service life, no memory effect, no pollution and no toxic, etc. Currently, lithium are being widely applicable to portable appliances such as laptops, cameras, cellphones. In addition, the developed large-capacity lithium-ion batteries have been employed in electric vehicles. There is no doubt that in 21st century, lithium ion batteries will become one of the main power sources of electric vehicles.
To become lithium batteries or battery packs, the materials should go through different production procedures. For instance, the procedures include explosion-proof valve sealing welding process, tab welding process, soft connection welding process, safety helmet spot welding process, battery shell sealing welding process, battery pack welding process. And laser welding machines are most suitable welding machines for all these procedures. For your information, in lithium ion industry, the common-used materials include copper, aluminum, alloy aluminum, stainless steel and so on.
Battery explosion-proof valves are the thin-walled valves on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the valve body of the explosion-proof valve ruptures to prevent the battery from bursting. The safety valve has an ingenious structure and the valve needs to be precisely welded on the battery. Thus, laser welding method is the first choice. Adopting continuous laser welding machines can achieve high-speed and high-quality welding. And welding stability, welding efficiency and yield can all be guaranteed
Usually, battery tabs are made of three materials: the positive terminal→aluminum, negative terminal→Ni/Ni-Cu. During the process of making lithium ion batteries, one step is to weld the battery tabs and poles together. It requires that the tabs and poles should be welded firmly. What’s, the welding seam must be smooth and very small. Aohua laser welder for battery are perfect equipment for this process.
The materials used for the battery electrode strips include pure aluminum strips, nickel strips, aluminum-nickel strips, and copper strips (scarcely used). Continuous laser welding equipment is used for welding battery electrode strips. Because of its good beam and small welding spot, it has unique advantages in the welding of high-reflectivity aluminum strips, copper strips and narrow-band battery pole strips (the pole strip width is less than 1.5mm).
In general, the battery case and cover are made of aluminum alloy and stainless steel. And the best welding method is continuous laser welding.
The series-parallel connection between batteries is generally completed by welding the connecting piece and the single battery. The positive and negative electrodes are made of different materials. Generally, there are two materials: copper and aluminum. Generally, copper and copper, aluminum and aluminum are welded by laser.
Notice: copper and aluminum should be welded by ultrasonic.
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