With the rapid development of the power new energy automobile industry, it also led to the development of the power battery industry. Due to the emergence of this social phenomenon, the requirements for the material of the battery casing are also increasing. So what kind of metal is the battery case? Do you know? Yaluo battery shell experts share with you:

What kind of metal is the battery case?

The best-selling battery case on the market today is the aluminum alloy case, which is also one of the metal types. The aluminum alloy has low density, but high strength, close to or exceeds high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry and is used second only to steel. .

There is also a stainless steel rigid shell, and the battery casing made of this material is also relatively large. Stainless steel is the abbreviation of stainless acid-resistant steel. It is resistant to air, steam, water and other weak corrosive media or stainless steel. It is called stainless steel. It is resistant to chemical corrosion media (chemical, alkali, salt, etc.). Steel grades are called acid-resistant steels.

Lithium battery casing alloy material construction has significant safety performance considerations, which can be expressed by material thickness and bulging coefficient. The reason why the lithium battery of the same capacity is lighter than the steel case is because the aluminum case can be made thinner. From the working mechanism of the lithium battery, during charging, lithium ions are deintercalated and the positive electrode expands in volume; during discharge, lithium ions are embedded from the positive electrode and the negative electrode is expanded; both of which cause solid expansion, and the bulging coefficient can be reduced by a suitable alloy formulation.