As the core component of new energy vehicles, the quality of power battery directly determines the performance of the vehicle.

Lithium battery manufacturing equipment generally includes three types of front-end equipment, mid-end equipment, and back-end equipment. The accuracy and automation level of the equipment will directly affect the production efficiency and consistency of the product. As an alternative to traditional welding technology, laser welder technology has been widely used in lithium battery manufacturing equipment.

Laser welding has many applications in the field of lithium batteries.

1.Battery tab welding

The tabs are usually divided into three materials. The positive electrode aluminum (Al) material, and the negative electrode nickel (Ni) material or copper-plated nickel (Ni-Cu) material. In the manufacturing process of power batteries, one of the steps is to weld the battery tabs and poles together.

2.Power battery module and pack welding

The series-parallel connection between the power battery 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 kinds of materials: copper and aluminum. Because copper and aluminum are welded by laser, they can form brittle compounds. To meet the application requirements, ultrasonic welding is usually used, but copper and copper, aluminum and aluminum are generally laser welded. At the same time, because copper and aluminum conduct heat very quickly, and have a very high reflectivity to the laser, the thickness of the connecting piece is relatively large, so a higher power laser welder is required.

Besides：The laser welding machine can also weld the battery explosion-proof valve, battery pole strip, power battery shell and cover plate sealing.

Laser welding has high energy density, small welding deformation, and small heat-affected zone, which can effectively improve the accuracy of parts. The welding seam is smooth and free of impurities, uniform and dense, without additional grinding work; secondly, laser welding can be precisely controlled and the focus spot is small , High-precision positioning, easy to achieve automation with mechanical arms, improve welding efficiency, reduce man-hours, and reduce costs; in addition, laser welding of thin plates or thin-diameter wires will not be as susceptible to reflow as arc welding. And it can be welded with a wide range of materials, which can realize welding between different materials.

ACEY New Energy provides 1500W 2000W 3000W 6000W laser welder and technical support to meet customers different requirements.