What are the differences in the materials of lithium-ion battery casings?

In the early days, prismatic lithium-ion batteries were mostly steel shells, which were mostly used in mobile phone batteries. Later, due to the low weight ratio of steel shells and poor safety, they were gradually replaced by aluminum shells and soft-packaged lithium-ion batteries. But in the case of cylindrical lithium-ion batteries, there is another situation. Most manufacturers use steel as the battery shell material. Because of the physical invariance of steel materials, the pressure resistance is much higher than that of aluminum shell materials. After optimizing the design and layout, the security device has been arranged inside the battery core, and the security of the steel shell cylindrical battery has reached a new level. At present, most of the strip-type computer batteries use the steel shell as the carrier. of. 2. Aluminum shell Aluminum shell is a battery shell made of aluminum alloy material. It is mainly used in square lithium-ion batteries. The reason for lithium battery recycling aluminum shell packaging is its light weight and more security than steel shells. The aluminum shell is designed with square and rounded corners. The material of the aluminum shell is generally aluminum-manganese alloy. The important alloys it contains are Mn, Cu, Mg, Si, Fe, etc. These five alloys are used in the aluminum shell of lithium-ion batteries. Play different purposes, such as Cu and Mg to improve strength and hardness, Mn to improve corrosion resistance, Si can strengthen the heat treatment of magnesium-containing aluminum alloys, Fe can improve high-temperature strength. The aluminum shell alloy material structure has a remarkable safety function, which can be implied by the material thickness and the swelling coefficient. The reason why a lithium-ion battery of the same capacity is lighter than a steel case is that the aluminum case can be made thinner. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Explanation of the difference between polymer lithium ion battery and ternary lithium ion battery