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Application of laser technology in power battery processing

As battery production becomes more complex, the number of scratches generated during the production process increases. These scratches cause the area around the can mouth to become dirty and reduce the quality of the welding of the top cover. Initially, Samsung SDI used cotton with detergent to clean these scratches, but the efficiency was so low that they had to find other more efficient cleaning methods. Laser cleaning was used by Samsung SDI to clean the casing due to its advantages of high efficiency and environmental protection. Remove all scratches and other unwanted material around the body.
It is reported that Samsung SDI is continuing to develop its fifth-generation battery production process. So far, Z-stack and label welding have been applied in production, and there are plans to apply laser technology to the cell sheet cutting process in order to improve the cell yield rate.

In power battery manufacturing
What are the specific applications of laser processing technology?

1.Laser cutting

Before the emergence of laser technology, in the power battery production process, traditional machinery was usually used to process and cut the tabs of power lithium batteries. During the use of traditional die-cutting equipment, the cutting burrs and heat-affected zones were too large. , may affect the performance of subsequent lithium batteries, which may cause various dangerous problems such as battery overheating, short circuit, or even explosion.
Laser cutting has the advantages of no tool wear, flexible cutting shapes, edge quality control, higher accuracy and lower operating costs. The cutting effect is better than traditional die cutting, with small burrs and small heat-affected zone, which greatly reduces the risk of lithium batteries. It eliminates potential safety hazards, and at the same time helps reduce manufacturing costs, improve production efficiency, and significantly shorten the die-cutting cycle of new products.
Laser cutting can be mainly used in metal foil slitting, metal foil cutting (tab cutting) and isolation film cutting in battery production.

2.Laser welding

Power batteries are divided into square, cylindrical and soft-pack batteries. At present, the popularity of square power batteries in China is relatively high. Because the battery core is required to be “light”, its material is generally aluminum alloy. The material thickness of mainstream manufacturers is about 0.8 mm, which requires These thin materials or thin-diameter wires can withstand high-strength splicing or stack welding, and conventional welding processes are difficult to meet the requirements.
Laser welding has the characteristics of concentrated energy, high welding efficiency, high processing accuracy, large weld depth-to-width ratio, and can be automated; compared with argon arc welding, resistance welding, ultrasonic welding, etc., the heat input is small and the heat affected zone is Small, small residual stress and deformation of the workpiece, less loss of welding materials, non-contact processing, higher efficiency, high welding accuracy, and higher safety. It has been widely used in pole lugs, battery shells, sealing nails, Welding of soft connections, explosion-proof valves, battery modules and other components.

3.Laser cleaning

In addition to the previously mentioned cleaning of the battery top cover by South Korea’s Samsung SDI before welding, laser cleaning technology can also be used in the pole piece manufacturing and cell production of lithium batteries, such as before pole piece coating, the battery assembly process and the coating removal process. Laser cleaning can be used in any process. Compared with traditional mechanical scraping, foam glue application or wet ethanol cleaning, which can easily cause damage to other components of lithium batteries, laser cleaning technology has the characteristics of no damage to the substrate, micron-level precise control, energy saving and environmental protection, etc. With many advantages, it can fully meet the various precision cleaning requirements in the battery manufacturing process, and can greatly improve the level of battery manufacturing technology.

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