What are the key types of lithium battery shell materials?

There are two types of lithium battery shells: steel shell and aluminum shell: 1. Steel shell In the early days, square lithium 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 shell Replaced by lithium batteries in soft packaging. But among the cylindrical lithium batteries, there is another situation. Most manufacturers use steel as the battery shell material. Because of the physical stability of steel materials, the pressure resistance is much higher than that of aluminum shell materials. After the structural optimization, the safety device has been placed inside the battery core, and the safety of the steel shell cylindrical battery has reached a new height. At present, most of the battery cells of the notebook computer use the steel shell as the carrier. 2. Aluminum shell 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 shell is that it is lighter in weight and safer 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 alloy components it contains are Mn, Cu, Mg, Si, Fe, etc. These five alloys are used in lithium battery aluminum shells. For different purposes, such as Cu and Mg to improve strength and hardness, Mn to improve corrosion resistance, Si to enhance the thermal solution effect of magnesium-containing aluminum alloys, and Fe to improve high temperature strength. The aluminum shell alloy material structure has significant safety performance considerations, and this safety performance can be expressed by the material thickness and the swelling coefficient. The reason why the lithium battery of the same capacity is lighter than the steel shell is that the aluminum shell can be made thinner. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the disadvantages of the battery?