Shell material of lithium battery

Ordinary batteries have a protective shell, and lithium batteries are no exception. The purpose of the shell is to protect the internal material damage effect of the lithium battery. The lithium battery is a secondary battery (rechargeable battery), which mainly depends on the lithium ion positive and negative electrodes. Mobile to work, generally use lithium as an electrode material, which is a representative of modern high-performance batteries. So what constitutes a lithium battery? The following is explained by the technical staff: The lithium battery shell of the lithium battery mainly includes a steel shell and an aluminum shell: 1. The steel shell In the early days, most square lithium batteries were made of steel shell, which was mainly used for cell phone battery. Later, due to the light weight, low energy consumption, and poor safety of the steel shell, it was gradually replaced by aluminum shells and soft-packaged lithium batteries. However, in terms of the types of lithium batteries and different pictures, most suppliers are using battery steel shell materials. Because of the physical stability of steel materials, the stress is much higher than that of aluminum shell materials. After the optimized design of the processing structure, the safety device is Placed in the core of the battery, the safety of the steel column battery has reached a new level. At present, most laptop batteries are batteries with steel shells as the carrier. Second, aluminum shell Aluminum shell is a battery shell made of aluminum alloy materials, which is mainly used for square lithium batteries. Lithium batteries are packaged in aluminum shells, which are lighter in weight and safer than steel shells. Aluminum shell design, rounded square corners and two aluminum materials are generally aluminum-manganese alloys. It contains important alloy elements such as manganese, copper, magnesium, silicon, iron, etc., which play different roles in the five alloy aluminum-shell lithium batteries. The role of copper and magnesium is to improve strength and hardness, Mn improves corrosion resistance, and if the effect of heat treatment of magnesium-aluminum alloy can be improved, iron can improve high-temperature strength. The aluminum alloy shell material structure has significant safety performance, which can be expressed by material thickness and bulging coefficient. Lithium batteries of the same capacity are lighter than steel because aluminum can be made thinner. According to the working mechanism of lithium batteries, lithium ions are not inserted during charging, and the volume of the positive electrode increases. During the discharge process, lithium ions are inserted from the positive electrode and expanded from the negative electrode. It will cause the solid to expand, and the coefficient of expansion can be reduced by proper alloy formulation. What material is the outer shell of a lithium battery made of? That's it. In summary, steel shells and aluminum shells have their own advantages. When we choose the lithium battery casing, we must choose according to the specific situation. Only in this way can we choose the appropriate casing product. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.