Advantages of laser cutting technology for lithium battery production and processing. We all know that lithium batteries, as the power engine of new energy vehicles, determine the endurance and mileage of new energy vehicles, and the quality of their technology directly affects the performance of the new energy vehicle market. To this end, companies are also trying to use more advanced processing techniques, such as laser cutting technology, to improve the performance of lithium batteries.

　　Laser cutting technology has the characteristics of controllable processing, high efficiency and high quality, and has a very broad application in industrial processing, such as automobile industry, textile machinery, sheet metal processing, etc. Laser cutting can be divided into four categories: laser vapor cutting, laser melting cutting, laser oxygen cutting and laser scribing and controlled fracture. Since my country's laser technology started late, core cutting technology relies on imports, which has led to the slow development of high-end laser cutting in the country.

　　laser cutter

　　Laser cutting machine is the most direct equipment that embodies laser cutting technology. It focuses the laser emitted from the laser into a high-power density laser beam through the optical path system. The laser beam irradiates the surface of the workpiece, causing the workpiece to reach the melting or boiling point, and at the same time, the high-pressure gas coaxial with the beam blows away the melted or vaporized metal. As the relative position of the beam and the workpiece moves, the material will eventually form a slit, thereby achieving the purpose of cutting.

　　As an emerging plate processing equipment, laser cutting machine has undergone continuous technological updates and process development. Laser cutting technology and laser cutting machine equipment are being familiar and accepted by the majority of plate processing enterprises, and are known for their high processing efficiency and processing accuracy. It has many advantages such as high efficiency, good cutting section quality, and the ability to perform three-dimensional cutting processing. It has gradually replaced traditional plate processing methods such as plasma cutting, water cutting, flame cutting, and CNC punching. According to different laser generators, laser cutting machines currently on the market can be roughly divided into three types: CO2 laser cutting machines, solid (YAG) laser cutting machines, and fiber laser cutting machines.

　　Features of laser cutting machine

　　YAG solid laser cutting machine

　　YAG solid-state laser cutting machines have the characteristics of low price and good stability, but the energy efficiency is generally <3%. The output power of current products is mostly below 800W. Due to the small output energy, it is mainly used for drilling holes and cutting thin plates. Its green laser beam can be applied under pulse or continuous wave conditions. It has short wavelength and good light concentration, which is suitable for precision processing. It is especially effective for hole processing under pulse. It can also be used for cutting, welding and photolithography. The wavelength of the laser of the YAG solid-state laser cutting machine is not easily absorbed by non-metals, so it cannot cut non-metallic materials. What the YAG solid-state laser cutting machine needs to solve is to improve the stability and life of the lithium battery, that is, to develop a large-capacity, long-life light Pump excitation light sources, such as the use of semiconductor optical pumps, can significantly increase energy efficiency.

　　Main advantages: It can cut aluminum plates, copper plates and most non-ferrous metal materials that other laser cutting machines cannot cut. The machine purchase price is cheap, the use cost is low, and the maintenance is simple. Most of the key technologies have been mastered by domestic enterprises. Accessories prices and maintenance The cost is low, the machine operation and maintenance are simple, and the quality requirements for workers are not high.

　　Fiber laser cutting machine

　　Because it can transmit through optical fiber, the fiber laser cutting machine has unprecedented flexibility, few fault points, easy maintenance, and fast speed. Therefore, the fiber laser cutting machine has great advantages when cutting thin plates within 4mm. However, it is affected by the wavelength of the solid laser. It has poor quality when cutting thick boards. The wavelength of the fiber laser cutting machine is 1.06um, which is not easily absorbed by non-metals, so it cannot cut non-metal materials. The photoelectric conversion rate of fiber laser is as high as more than 25%. The advantages of fiber laser are quite obvious in terms of electricity consumption and supporting cooling system. According to international safety standards, laser hazard levels are divided into four levels. Fiber laser is the most harmful level due to its short wavelength and great damage to the human body and eyes. For safety reasons, fiber laser processing requires a fully enclosed environment.

　　Main advantages: high photoelectric conversion rate, low power consumption, capable of cutting stainless steel plates and carbon steel plates within 12MM. It is the fastest laser cutting machine for cutting thin plates among these three machines. It has small slits and good spot quality, and can be used for fine work. cutting.

　　CO2 laser cutting machine

　　CO2 laser cutting machine can stably cut carbon steel within 20mm, stainless steel within 10mm, and aluminum alloy below 8mm. The wavelength of CO2 laser is 10.6um, which is easily absorbed by non-metals. It can cut non-metallic materials such as wood, acrylic, PP, and organic glass with high quality. However, the photoelectric conversion rate of CO2 laser is only about 10%. The CO2 laser cutting machine is equipped with a nozzle that sprays oxygen, compressed air or inert gas N2 at the beam exit to increase the cutting speed and make the cut smooth and smooth. In order to improve the stability and life of the power supply, the discharge stability of high-power lasers must be solved for CO2 gas lasers. According to international safety standards, laser hazard levels are divided into four levels, and CO2 laser belongs to the least hazardous level.

　　Main advantages: high power, generally between 2000-4000W, capable of cutting full-size stainless steel, carbon steel and other conventional materials within 25 mm, as well as aluminum plates within 4 mm and acrylic plates, wooden material plates and PVC plates within 60 mm. And it is very fast when cutting thin plates. In addition, since the CO2 laser outputs continuous laser light, it has the smoothest and best cutting section effect among the three laser cutting machines during cutting.

　　Advantages of laser cutting technology for lithium battery production and processing

　　The lithium battery processing process has high requirements on accuracy, controllability and quality of processing machines. During use, the die-cutting knife will inevitably wear out, causing dust to fall off and burrs to form, which may cause dangerous problems such as battery overheating, short circuit, explosion, etc. In order to avoid danger, it is more suitable to use laser for processing. Compared with traditional mechanical processing, the advantages of laser processing include no tool wear, flexible cutting shapes, edge quality control, higher accuracy and lower operating costs.

　　Before the advent of laser technology, the battery industry used traditional machinery for processing. Compared with traditional mechanical processing, laser processing has the advantages of no tool wear, flexible cutting shape, edge quality control, higher accuracy and lower operating costs. It is conducive to reducing manufacturing costs, improving production efficiency and greatly shortening the mold of new products. cut cycle. As an emerging industry, laser cutting has many particularities in the production process of lithium-ion batteries. Many of its applications still face various problems that need to be solved and improved, such as the improvement of laser technology, the improvement of cutting efficiency, and the stability of cutting effects. Sex and so on.

　　In recent years, with the country's attention and enterprises' investment in core technologies, China has also made some achievements in cutting-edge laser cutting technology, such as laser cutting head technology. These advances are inseparable from the efforts of enterprises themselves. It is believed that in the near future, this type of equipment will completely replace traditional mechanical mold making equipment, bringing revolutionary progress to the safety and low cost of lithium batteries.

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