Processing Methods and Processes for Lithium Battery Pack Aluminum Shell Processing

Processing methods and processes for lithium battery pack aluminum shell processing. Lithium battery packs generally use aluminum shells to increase the stability of the battery. Lithium battery packs have the advantages of high precision and anti-shake, 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 shells. This article will talk about the processing methods of lithium battery pack aluminum shells.

What is lithium battery aluminum shell?

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

Because the aluminum shell of lithium battery pack has the above relative advantages, aluminum shell lithium battery is the mainstream of liquid lithium battery at present, and is used in almost all fields involved in lithium battery. The aluminum shell of lithium battery is still evolving towards high hardness and light weight technology, which will provide the market with more technologically superior lithium battery products.

Processing method of aluminum shell of lithium battery pack:

Aiming at 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 shells to increase the stability of the battery. Most of the existing lithium battery aluminum shell processing equipment will cause the upper cover and the shell to shake when the aluminum shell is processed, causing the upper cover to deviate from the original position, and then the aluminum shell will deviate, affecting the processing accuracy and affecting the use and appearance of the aluminum shell.

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

Lithium battery pack production process:

Objectively speaking, the lithium battery pack production process is divided into three major sections, one is pole piece production, the second is battery cell production, and the third is battery assembly. In the lithium battery production process, pole piece production is the foundation, battery cell production is the core, and battery assembly is related to the quality of lithium battery finished products. The specific steps of the lithium battery production process include positive electrode slurry drawing, negative electrode slurry drawing, positive electrode sheet, negative electrode sheet, steel shell 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 the same as the electrostatic spraying method of general liquid coatings. The difference is that the powder spraying is dispersed rather than atomized. It is a coating sprayed by an electrostatic powder spray gun. While dispersing, the powder particles are negatively charged. The charged powder particles are affected by airflow and electrostatic attraction, and are coated on the grounded power battery aluminum shell, and then heated, melted, and solidified into a film.

2. Electrophoretic painting process:

The electrophoretic painting process is a coating method that uses an external electric field to make the particles such as pigments and resins suspended in the electrophoretic liquid migrate in a directional manner and deposit on the substrate surface of one of the electrodes. It has the characteristics of water solubility, non-toxicity, and easy automation control. After the electrophoretic painting process, the surface of the power battery aluminum shell has a soft gloss and can resist the invasion of cement and mortar acid rain.

3. Electrochemical surface ceramic process:

The aluminum shell of the power lithium battery pack adopts plasma enhanced electrochemical surface ceramic process. Although it has excellent quality, it is costly. The profiles produced by this process have more than 20 tones. Its biggest feature is that it can be colored like printed cloth as needed. The surface of the profile is colorful and the decorative effect is excellent.

4. Frosted process:

Frosted aluminum profiles avoid the disadvantage that bright aluminum alloy profiles will cause light interference under certain environments and conditions in architectural decoration. Its surface is as delicate and soft as brocade, which is very popular in the market, but the existing frosted materials must overcome the uneven surface sand particles and the shortcomings of visible mold patterns.

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. Lithium battery production and manufacturing have high requirements for equipment performance, precision, stability and automation level. Therefore, every link in the production process of lithium battery pack aluminum shell must be managed strictly and carefully, so as to improve the safety performance of lithium battery products.

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