Several major process difficulties in LR03 battery welding

　　Generally speaking, there are two main welding methods for LR03 battery casing: side welding and top welding. Each has its own advantages and disadvantages. However, due to the particularity of its material, the aluminum casing of a LR03 battery is prone to problems such as bulges, pores, and cracks. , Square batteries are prone to problems when welding at corners. The following will introduce to you some difficulties in LR03 battery packaging welding:

　　1. Technical difficulties in LR03 battery welding

　　Generally, the thickness of the aluminum shell of power batteries is required to be less than 1.0 mm. Mainstream manufacturers currently use two shell material thicknesses of 0.6mm and 0.8mm depending on the battery capacity. Welding methods are mainly divided into side welding and top welding. The main benefit of side welding is that it has less impact on the inside of the battery core and spatter will not easily enter the inside of the shell cover.

　　Since bulges may occur after welding, which will have a slight impact on the assembly of subsequent processes, the side welding process has higher requirements for the stability of the laser, the cleanliness of the material, and the matching gap between the top cover and the aluminum shell of the LR03 battery. . Since the top welding process is welded on one surface, a more efficient galvanometer scanning welding method can be used, but it requires high requirements for shell insertion and positioning in the previous process, as well as high automation requirements for the equipment.

　　2. Difficulties in welding aluminum shells of power batteries

　　At present, the aluminum shell of power batteries accounts for more than 90% of the entire LR03 battery. Laser welding of aluminum materials is difficult, and it will face problems such as bulges on the weld mark surface, pore problems, explosion problems, internal bubble problems, etc. Surface bulges, pores, and internal bubbles are fatal injuries to laser welding. Many applications have to stop or find ways to avoid them due to these reasons.

　　Many battery manufacturers struggle with this in the early stages of research and development. The main reason is that the fiber core diameter used is too small or the laser energy setting is too high. There are many factors that cause explosions (also called splashes), such as the cleanliness of the material, the purity of the material itself, the characteristics of the material itself, etc. The decisive factor is the stability of the laser.

　　In LR03 battery welding, welding process technicians will select the appropriate laser and welding process parameters according to the customer's battery material, shape, thickness, tension requirements, etc., including welding speed, waveform, peak value, welding head tilt angle, etc. to set a reasonable Welding process parameters to ensure that the final welding effect meets the requirements of LR03 battery manufacturers.

　　3. Difficulties in welding square power batteries

　　Due to factors such as the matching accuracy of incoming materials, square batteries are most likely to have problems at the corners during welding. This needs to be continuously explored based on the actual situation. Adjusting the welding speed can solve such problems. Circular batteries do not have this problem, but subsequent integration into battery modules is more difficult.

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