Laser coating removal cleaning has been identified as an ideal technology to replace the traditional chemical technology in the process of automotive coating removal. This laser technology can remove coatings without the use of chemical products and can prevent defects on the metal substrate surface. Laser cleaning technology has the characteristics of high efficiency, precision, environmental protection, and low cost. At present, our company mainly promotes two types of laser cleaning equipment: HCC series laser rust cleaning machine and HCP series laser cleaning machine.Below, we will introduce the laser ablation coating removal technology in detail.
Currently, Laser coating removal cleaning are mainly used in the lithium batteries of new energy vehicles in the automotive industry, for the removal of coating on battery cores, cleaning of electrodes, pole pieces, cover plates, foil cleaning, and other small parts, which requires laser cleaning to be more refined and precise. Therefore, the pulse laser cleaning machine is mainly used in the automotive industry. Our pulse laser cleaning machine has a power of 50W, 100W, 200W, 300W, and 500W, with almost no damage to the basic parts, making it very suitable for the high-precision industry of laser coating removal in battery cells.
Laser coating removal cleaning can be defined as the removal of unwanted substrates or the prolongation of contamination of unwanted substrates from solid substrates. It includes the removal of foreign organic impurities, namely, coatings on solid or metal substrates. Laser cleaning for coating removal has great potential in replacing water-intensive and expensive wet chemical methods. The unique characteristics of laser cleaning include universality, precision, controllability, selectivity, and environmental friendliness. Laser ablation is a mechanical process that can be achieved by applying high-intensity pulse and continuous laser irradiation. Laser ablation is a mechanical process that can be achieved by applying high-intensity pulsed and continuous laser irradiation.
In terms of technology, this mechanism has the advantages of removing the coating, such as no direct mechanical or chemical contact with the substrate, cleaning in place, short cleaning time, no use of toxic solvents and chemical products, no damage to the metal substrate, and controllable clean. Next, we will discuss the specific application of laser ablation coating removal in the automotive industry:
Laser cleaning of metal foil parts:
The positive and negative electrode pieces of lithium batteries are made by coating the positive and negative materials of lithium batteries on aluminum foil and copper foil, and the electrode coating is of great significance to the safety of the batteries. If particles, debris, dust, or other media are mixed in the coating process, it can cause micro-short circuits inside the battery, and in severe cases, cause the battery to catch fire or explode. Therefore, the foil needs to be cleaned before coating to obtain a completely clean and oxide-free surface. The existing battery electrode plates generally use ultrasonic cleaning, and ethanol solution is used as a cleaning agent for cleaning before coating. However, this method has certain limitations.
When ultrasonic cleaning metal foil components, especially aluminum alloy materials, the cavitation effect of ultrasonic waves is easily corroded by aluminum foil, resulting in fine small holes. The longer the action time, the larger the holes.The foils used in lithium battery electrodes are generally single zero foils with a thickness of 10μm, which are more prone to tearing and forming holes due to cleaning process issues. Using ethanol solution as a cleaning agent not only easily damages other parts of the lithium battery, but also easily causes hydrogen embrittlement, which affects the mechanical performance indicators of aluminum foils.
However, using laser ablation coating removal technology can not only improve the efficiency of the cleaning process and save cleaning resources, but also establish real-time monitoring of the cleaning process data and quantitatively judge the cleaning results, which can effectively improve the consistency of electrode batch production.
Cell lug laser cleaning:
The lugs are the metal strip that draws the positive and negative electrodes out of the battery cell, and is the contact point when the battery is charged and discharged. Contaminants on the surface such as grease, corrosion inhibitors and other compounds in the process can lead to poor fusion, cracks and porosity at the welds. During the factory process, the lugs are often uneven, bent or even twisted, and the strength of the lug-cell weld is weak, making false welds, fake welds and short joints when welding, resulting in lower conductivity of the welded joint and ultimately limiting the overall performance of the battery pack. Whether this contact point surface is clean or not will greatly affect the reliability and durability of the electrical connection. The manual cleaning, wet flow cleaning and plasma cleaning currently used have different problems, and laser coating removal technology can greatly improve this problem.
Laser cleaners have several advantages in battery cell manufacturing:
Efficiency: Laser cleaning machines can quickly and effectively clean the surface of battery cell components without causing any damage to electrode plates, separators, and other components. Compared with traditional chemical and mechanical cleaning methods, laser cleaning machines are more efficient, precise, and safe.
Precision: Laser cleaning machines can adjust the intensity of the laser and the size of the focusing point to achieve fine processing of the surface of battery cell components. This can ensure the cleanliness and smoothness of the surface of the battery components, thereby improving the performance and life of the battery.
Environmental protection: Laser cleaning machines do not require the use of chemical cleaning agents and water as cleaning media, thus avoiding pollution to the environment. In addition, laser cleaning machines can perform non-destructive cleaning of battery cell components, reducing the harm of waste batteries to the environment.
Laser coating removal involves several complex mechanisms, namely thermal ablation, mechanical effects, and a combination of thermal ablation and mechanical effects. These mechanisms typically depend on the characteristics of the laser beam and its delivery method. Currently, we mainly focus on the following aspects of laser ablation coating removal: optimizing the coating removal process, minimizing the risk of substrate damage, reducing the impact on the health of workers, the environment, and reducing labor costs. These issues are also of concern to our company when developing and producing laser cleaners, and we can assure you that we are doing our best to address your concerns.