Technological methods and processes for processing aluminum shells of lithium battery packs. Lithium battery packs generally use aluminum casings to increase battery stability. The lithium battery pack has the advantages of high precision and anti-shaking, which solves the problem of deviation in most lithium battery aluminum shell processing equipment. In order to reduce the weight of the battery, it is an inevitable choice to use aluminum alloy materials to make lithium battery casings. In this article, the editor will talk about the processing technology of the aluminum shell of lithium battery pack.

　　What is a lithium battery aluminum case?

　　Lithium battery aluminum shell is a battery shell made of aluminum alloy material. It is mainly used in square lithium batteries. The reason why lithium batteries are packaged in aluminum shells is that it is light weight and safer than steel shells. Lithium battery pack aluminum shells are designed with square corners and rounded corners. The material of the aluminum shell is generally aluminum-manganese alloy. The main alloy components it contains are Mn, Cu, Mg, Si, Fe, etc. These five alloys are used in lithium battery aluminum The shell plays different roles. For example, Cu and Mg improve strength and hardness, Mn improves corrosion resistance, Si can enhance the heat treatment effect of magnesium-containing aluminum alloys, and Fe can improve high-temperature strength.

　　Precisely because the aluminum shell of lithium battery packs has the above-mentioned relative advantages, aluminum-shell lithium batteries are currently the mainstream of liquid lithium batteries and are used in almost all fields involving lithium batteries. Lithium battery aluminum shells are currently evolving towards high hardness and light weight technology, which will provide the market with more technologically superior lithium battery products.

　　Processing methods for lithium battery pack aluminum shell processing:

　　In view of the shortcomings of the existing technology, the utility model provides a fully automatic lithium battery aluminum shell processing equipment. Lithium battery packs generally use aluminum casings to increase the stability of the battery. Most of the existing lithium battery aluminum casing processing equipment causes the aluminum casing to shake when the upper cover and the casing are connected, causing the upper cover to deviate from its original position. The position of the aluminum shell will then deviate, and the processing accuracy will be affected, affecting the use and appearance of the aluminum shell.

　　In terms of technological maturity, aluminum shell technology is very mature and does not have high requirements for material technology (such as inflation rate, expansion rate and other indicators). There are no technical barriers in the industry; while soft-pack lithium-ion batteries still have many technical problems. It needs to be solved, especially in terms of battery cycle expansion indicators. Most battery manufacturers have not yet solved this problem. The degree of automation in the manufacturing of aluminum-shell batteries is higher than that of soft-pack lithium-ion batteries. Therefore, the impact of human factors on product consistency is reduced to a certain extent, while labor costs are saved.

　　Lithium battery pack production process flow:

　　Objectively speaking, the lithium battery pack production process is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. In the lithium battery production process, pole piece production is the foundation, battery core production is the core, and battery assembly is related to the quality of the finished lithium battery. The specific steps of the lithium battery production process include positive electrode slurrying, negative electrode slurrying, positive electrode sheets, negative electrode sheets, steel case assembly, liquid injection and testing, and packaging.

　　What are the types of surface treatment processes for power battery aluminum shells?

　　1. Powder electrostatic spraying process:

　　The working principle of the powder electrostatic spraying process is almost identical to the general electrostatic spraying method of liquid paint. The difference is that the powder spraying is dispersed rather than atomized. It is a coating sprayed by an electrostatic powder spray gun. The powder particles are negatively charged while being dispersed. The charged powder particles are affected by the air flow and electrostatic attraction and are applied to the grounded aluminum shell of the power battery, and then heated, melted and solidified. Film formation.

　　2. Electrophoretic painting process:

　　The electrophoretic coating process is a coating method that uses an external electric field to cause the particles such as pigments and resins suspended in the electrophoretic fluid to migrate in a direction and deposit them on the surface of the substrate of one of the electrodes. It is water-soluble, non-toxic, and easy to control automatically. After the electrophoretic painting process, the surface of the aluminum shell of the power battery has a soft luster and can resist the invasion of cement and mortar acid rain.

　　3. Electrochemical surface ceramicization process:

　　The aluminum shell of the power lithium battery pack uses a plasma-enhanced electrochemical surface ceramicization process. Although the quality is excellent, the cost is high. The profiles produced by this process have more than 20 colors. Its biggest feature is that it can be colored like printed cloth according to needs. The surface of the profiles is colorful and the decorative effect is excellent.

　　4. Frosting process:

　　Frosted aluminum profiles avoid the shortcomings of bright aluminum alloy profiles that may cause light interference under certain environments and conditions in architectural decoration. Its surface is as delicate and soft as brocade, and is very popular in the market. However, the existing frosted aluminum profiles The material must overcome uneven sand grains on the surface and be able to see deficiencies in the mold pattern.

　　The production process of lithium battery packs is quite complicated. After all, the safety performance of lithium-ion battery products is directly related to the life and health of consumers. The production and manufacturing of lithium batteries has high requirements on the performance, accuracy, stability and automation level of equipment. Therefore, every link in the production process of lithium battery pack aluminum shells must be strictly and carefully managed, so as to improve the safety performance of lithium battery products.

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