The rapid promotion of lithium battery applications has driven the rapid development of the lithium battery industry, and also led to the innovation of the production technology in the production process of the entire industry, and the laser welding technology applied to the welding of the lithium battery top cover is also in a rapid update iteration. In the manufacture of lithium batteries, laser welding technology has been widely used in the sealing welding link of stainless steel shell and square aluminum shell battery top cover, which is an important link in the production technology of lithium batteries.

Application principle and advantage of laser welding machine

Usually, the top of the lithium battery shell has a rectangular cover plate with four round guide angles, and the plate is equipped with positive and negative input terminals. When sealing, the cover plate is plugged into the shell and flush with the mouth. The automatic laser welding machine for lithium battery top cover is used for welding between the battery shell and the electrode cover plate, and the rectangular gap between the cover plate and the shell is welded and sealed by laser. With the optimization and adjustment of laser parameters, the square battery can be successfully sealed at one time. Laser welding is a new type of welding, no processing after welding or only simple processing, high quality weld, no porosity, accurate control, small focusing spot, high positioning accuracy, easy to achieve automation.

With the rapid growth of battery demand for electric vehicles and other rechargeable battery-powered products in the market today, the need for battery manufacturers to improve the accuracy of motion control and the yield of laser welding machines has become increasingly urgent. At present, the welding equipment on the market widely has the problems of slow track welding speed, poor control accuracy and low welding yield. Therefore, the manufacturer of the top laser welding machine urgently needs to improve the motion control accuracy of the welding machine, achieve uniform welding speed throughout the welding process, small speed fluctuations, and reduce bad welding; Based on the production needs of lithium battery manufacturers, the yield of laser welding is increased to more than 99% to achieve a breakthrough in production capacity.

In order to meet the requirements of lithium battery manufacturers to improve the welding yield, Putianda laser welding machine equipment greatly improves the welding speed of the battery cover through continuous improvement, and the efficiency of the product is also greatly improved, and the double-effect improvement of speed and accuracy makes the welding yield of Putianda laser welding equipment reach more than 99%.