Application of 355nm Ultraviolet Pulse Laser in Lithium Battery Cleaning

As one of the supporting technologies for advanced manufacturing, pulsed lasers shine in applications in the fields of automobiles, electronics, aviation, photovoltaics and consumer goods by virtue of their advantages of high precision, low thermal deformation, high efficiency and short cycle time. , processing efficiency and reducing consumables and energy conservation and emission reduction play an increasingly important role. Therefore, pulsed lasers play an important role in the development of high-end precision manufacturing in my country, and are also an important field of concern to the world.

At present, pulsed lasers are mainly used for cutting, marking, engraving, and drilling, and the application of laser cleaning is less. The main mechanism of laser cleaning is similar to that of laser marking. The high energy density beam increases the surface temperature of the material and causes thermal expansion. The thermal expansion causes the contaminants or the substrate to vibrate, so that the contaminants overcome the surface adsorption force from the surface of the substrate. , and then achieve the purpose of removing stains.

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Today, with the rapid development of laser cleaning technology, many laser manufacturers are deeply expanding applications in more fields, making more efforts to make it a new market growth point, especially in new energy vehicles, semiconductors, 5G and other fields. Laser cleaning is significant.

Since the key performance of new energy vehicles such as battery life and safety is closely related to power batteries, as the core components, power batteries have very high requirements on production equipment. Its manufacturing process can be divided into three parts: pole piece manufacturing, cell production and battery assembly, in which many laser processing processes are applied, such as pole piece cutting, tab cutting, shell marking and laser cleaning. The use of pulsed laser cleaning is mainly used in the assembly process of the latter stage, that is, laser cleaning is performed before the battery is welded to remove dirt, metal debris, dust, etc. quality, and improve the level of battery manufacturing technology.

Since the copper and aluminum materials used in the positive and negative metal materials of the power battery have high reflection characteristics, the 355nm ultraviolet nanosecond laser developed and designed by Nafei Optoelectronics can achieve a very good cleaning effect. First of all, most materials have a high absorption rate of ultraviolet light. Copper and aluminum materials still have a high absorption rate at a wavelength of 355nm. In addition, the single-photon energy of ultraviolet light is high and the repetition frequency is high, up to 100KHz. The surface material is more efficient, and its pulse sequence is stable, which can meet the 7*24 hours of operation on the power battery production line, which is very suitable for the strong demand for power battery production capacity.

In addition, the non-consumables and pollution-free laser processing is also particularly in line with the current mainstream of green energy conservation and environmental protection, and is also the trend of future industrial development. As a green cleaning technology, laser cleaning is expected to increase its development potential with the rapid development of the new energy vehicle market.