There are many manufacturing processes of lithium-ion battery or battery pack, among which there are many processes, such as explosion-proof valve sealing welding, soft connection welding, battery shell sealing welding, module and pack welding, etc. laser welding is the ideal process. The materials of power battery used for welding mainly include pure copper, aluminum and aluminum alloy, stainless steel, etc. the laser welding machine is widely applicable to welding processing.

Laser welding has always been an essential process in the manufacturing process of lithium battery. Various materials are widely used in laser welding, such as stainless steel shell, aluminum shell, polymer and so on. The high speed held by the laser welding machine is unmatched by other welding technologies. With the continuous development of the industry, higher requirements are put forward for the efficiency and quality of laser welding. The fiber laser promotes high-speed welding, which can achieve low heat input and high solidification speed at the weld, and effectively control the solidification defects in mixed metal welding.

The structure of the battery usually contains a variety of materials, such as steel, aluminum, copper, nickel, etc. these metals may be made into wires or shells; Therefore, whether it is the welding between one material or multiple materials, it puts forward higher requirements for the welding process. The technological advantage of laser welding machine is that it can weld a wide range of materials and can realize the welding between different materials.

Laser welding has the advantages of high energy density, small welding deformation and small heat affected zone, which can effectively improve the accuracy of parts. The weld is smooth, free of impurities, uniform and dense, and no additional grinding work is required; Secondly, the laser welding machine can be accurately controlled, with small focus light points and high-precision positioning. It is easy to realize automation with the manipulator, improve welding efficiency, reduce working hours and reduce costs; In addition, laser welding of thin plates or fine-diameter wires is not as easy to suffer from remelting as arc welding.

Lithium battery manufacturing equipment generally includes front-end equipment, middle-end equipment and back-end equipment. Its equipment accuracy and automation level will directly affect the production efficiency and consistency of products. As an alternative to traditional welding technology, laser welding machining technology has been widely used in lithium battery manufacturing equipment.