Nowadays, new energy vehicles are rapidly emerging globally, and people gradually have requirements for the endurance of vehicles. Manufacturers also have increasingly high requirements for the quality of batteries. As the battery volume increases, sealing becomes a major issue. Sealing treatment usually involves welding, and ordinary welding certainly poses certain safety hazards. What are the welding process issues with new energy batteries? Let's take a look together.
During the production process of power batteries, the quality stability of battery shell welding can affect the consistency and safety of the battery assembly system. The interior of the power battery shell mainly contains organic electrolyte and special diaphragm, and the cover plate mainly includes explosion-proof valve, pole, safety helmet, liquid injection hole, etc. The sealing welding requirements for the shell and cover plate are very high, and the welding quality directly affects the sealing degree of the battery. Poor welding can lead to battery leakage, lithium precipitation, and substandard battery appearance.
Common welding seam problems in battery shell welding include:
1. The appearance is not ideal, with air holes, obvious welding marks, and deformation of the sample;
2. Poor quality, insufficient firmness, insufficient welding penetration, and insufficient sealing due to large pores.
Unqualified welding can be mainly summarized as two aspects: poor appearance and insufficient welding strength.
1. Factors affecting poor appearance: CCD scanning accuracy of welding equipment, type and flow rate of protective gas, cleanliness of welding samples, mechanical fitting accuracy and method of samples.
Factors affecting welding strength and sealing performance: raw material matching accuracy, aluminum composition, and process parameters. Protective gas can prevent metal surface oxidation, protect lenses, and blow off plasma during laser welding. It is necessary to control the airflow direction, pressure, and flow rate. The protective gas forms turbulence, which can lead to porosity and uneven welding seams.
Above the issues, we need to ensure the aesthetic level and quality accuracy of welding. Riselaser has proposed corresponding solutions. Riselaser handheld laser welding machine adopts precision laser, lightweight volume, humanized control, high-quality beam quality, and high photoelectric conversion efficiency. It is suitable for welding thin metal materials such as carbon steel, stainless steel, aluminum alloy, brass, etc. The welding efficiency is high, the quality accuracy is high, the welding is firm and the finished product is not deformed. Aluminum and stainless steel materials are welded without black edges, and the overall effect is beautiful.
Handheld laser welding machine can meet various precision machining requirements and solve various problems in the field of thin plate welding.
