What are the different types of surface treatment processes for aluminum casings of power lithium batteries? During the manufacturing process, aluminum casings for power lithium batteries undergo surface treatment. What are the main types of surface treatment technologies? Surface treatment processes for aluminum casings of power lithium batteries include powder electrostatic spraying, electrophoretic coating, plasma-enhanced electrochemical surface ceramization, and sandblasting. Below, technical personnel from a battery aluminum casing manufacturer will explain these different processes. Let's take a look at what kinds of surface treatment processes are involved in battery manufacturing.
1. Powder electrostatic spraying process for battery surface treatment:
The working principle of electrostatic powder coating is almost identical to that of electrostatic spraying of liquid coatings. The difference lies in the dispersion rather than atomization. It relies on an electrostatic powder spray gun to disperse the coating, simultaneously imbuing the powder particles with a negative charge. These charged particles, under the influence of airflow (or centrifugal force, etc.) and electrostatic attraction, adhere to the grounded aluminum casing of the lithium-ion battery, where they are then heated and melted to solidify into a film. The resulting aluminum casing for lithium-ion batteries exhibits excellent corrosion resistance and significantly superior resistance to acids, alkalis, and salt spray compared to anodized and colored profiles.
2. Electrophoretic coating process for battery surface treatment:
Electrophoretic coating is a coating method that uses an external electric field to cause pigments and resin particles suspended in an electrophoretic solution to migrate directionally and deposit on the surface of a substrate, one of the electrodes. It features water solubility, non-toxicity, and ease of automation control. The aluminum casing of a power lithium battery after electrophoretic coating has a soft gloss and can resist the erosion of cement, mortar, and acid rain.
Power lithium battery aluminum casing surface treatment process
3. Plasma-enhanced electrochemical surface ceramization process for battery surface treatment:
The aluminum casing of power lithium batteries uses a plasma-enhanced electrochemical surface ceramicization process, which, while producing excellent quality, is also costly. This process produces profiles in over 20 color tones, its most notable feature being the ability to match colors like printed fabric, resulting in a vibrant and aesthetically pleasing surface.
4. Sanding process for battery surface treatment:
Frosted aluminum profiles prevent the light interference caused by bright aluminum alloy profiles in certain environments and conditions in architectural decoration. Its surface is as delicate and soft as brocade, which is very popular in the market. However, existing frosted materials must overcome the shortcomings of uneven surface sand particles and visible mold patterns.
5. Methods for handling surface damage to the aluminum casing of power lithium batteries
1. When the forklift delivers the profile from the discharge track to the slab bed, the profile is damaged due to excessive speed.
2. There are exposed metal or hard inclusions in the graphite strips on the discharge track or slab bed, which will scratch the surface of the profile when they come into contact with it.
3. Strengthen the control of ingot quality.
4. Use soft felt to isolate the profiles from the accessories to minimize contact damage between the profiles and accessories.
5. Handle with care during production and avoid dragging or flipping the profiles as much as possible.
6. There are foreign objects in the mold cavity or working belt, and the hardness of the mold working belt is low, which will cause the surface of the working belt to be damaged and scratch the profile during extrusion.
7. Improve mold repair quality, nitrid the mold regularly and strictly implement the nitriding process.
Some battery surface treatment processes are quite complex, while others are very simple. Generally speaking, battery surface treatment processes are usually something that only a few companies can do. Many lithium-ion battery pack manufacturers do not handle these battery surface treatment processes on their own. This not only makes them seem unprofessional but also shows a lack of focus. Therefore, you will rarely see surface treatment processes for the aluminum shells of power lithium batteries from any battery manufacturer.
