LR41 battery

What are the factors that affect the quality of aluminum shell materials for LR41 battery?

What are the factors that affect the quality of aluminum shell materials for power lithium-ion batteries? As the protective shell of power lithium-ion batteries, the shell of LR41 battery is also a key factor in determining the quality of power lithium-ion batteries. The aluminum shell material of LR41 battery has low density, soft material, and is easy to stretch and form the battery shell as a whole. It has been used by many companies for power lithium battery packaging. The aluminum shell of LR41 battery is mainly made of aluminum profile materials. The quality of aluminum shells for LR41 battery is good or bad, so how to judge the quality?

What are the factors that affect the quality of aluminum shell materials for power lithium-ion batteries?

Aluminum shells for power lithium-ion batteries are a shell product used in high-speed railways, bullet trains, lithium-ion battery cars and other fields. Generally speaking, in the process of producing aluminum shells for power lithium-ion batteries, there will be more or less defects. Although these defects are very small, they will also affect the appearance and use of the product. The defects are mainly reflected in the small particles on the surface of the aluminum shell of LR41 battery. The important reasons for this phenomenon are as follows:

1. The reason for the adsorption of tiny particles. There are four types of fine-grained burrs on the surface of the aluminum shell of the power lithium-ion battery. The main reason is that the dust in the air adheres to the surface of the metal casting, and there will be some dust and aluminum and even some water and oil when the heating furnace is heated. These impurities will cause tiny particles on the surface.

2. Because the aluminum shell material of the power lithium-ion battery is cast at high temperature, the aluminum shell production speed is too fast and the cooling intensity is large, which causes some elements in the alloy to be unable to be converted into the required elements within the prescribed time. Because this material has a needle-like structure, high hardness and poor plasticity. The tensile strength of this manufacturing process is very low, and not only yellow rust will appear under high temperature conditions, but also cracks will appear.

3. Impurities in the aluminum shell material of the power lithium-ion battery will affect the operation of the entire shell. During the melting process of the aluminum shell, due to insufficient refining, impurities such as soil, refining agent, coating, powder coating, oxide film, etc. are all mixed into the aluminum shell, resulting in a decrease in the quality of the aluminum shell of the power lithium battery.

What factors affect the performance of the aluminum shell processing of power lithium-ion batteries?

1. Density

After cold deformation, the density of aluminum material decreases due to defects such as micro cracks or micro cracks, crack hollowing, etc. in the crystal and between crystals.

2. Stability

After cold deformation, the internal energy of the aluminum shell of power lithium-ion battery increases, making its chemical function more unstable and easy to be corroded, especially prone to stress corrosion.

3. Resistance

The damage of intercrystalline material makes the grains directly contact, the grain orientation is ordered, and the intercrystalline and intracrystalline cleavage have a significant effect on the change of resistance. The former two make the resistance decrease with the increase of deformation degree, while the latter is the opposite.

Method for identifying the quality of aluminum shell materials for power lithium-ion batteries

1. Label inspection: whether the aluminum shell and packaging of power lithium-ion batteries are marked with product standard code and production license number, etc.

2. Surface quality: In addition to being clean, the surface of the aluminum shell material of LR41 battery is not allowed to have defects such as cracks, peeling, corrosion and bubbles, and is not allowed to have defects such as corrosion spots, electric burns, black spots, and oxide film shedding.

3. Oxide film thickness: The oxide film of the aluminum shell of the power lithium-ion battery is formed during anodization, which has protective and decorative purposes and can be detected by an eddy current thickness gauge.

4. Sealing quality: There are many gaps on the surface of the aluminum shell of the power lithium-ion battery after anodization. If it is not sealed or sealed poorly, the corrosion resistance of the aluminum shell of the power lithium battery will be reduced. Common methods for sealing quality inspection include acid leaching, admittance method and phosphotyric acid method.

Summary: At present, aluminum shell batteries account for more than 90% of the entire power lithium battery. In order to improve the quality of lithium-ion battery shells, the reasons that affect the quality of aluminum profile shells should be found.

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