Is the Battery Enclosure Material a Steel Enclosure or An Aluminum Enclosure?

There are just so many outdoor battery enclosure on the market today. But the most are steel and aluminum enclosure. The usage of these two kinds of enclosure is in the same level, but they always have their own advantages and characteristics. Today, YONGUCASE will tell you whether the battery enclosure is made of steel or aluminum.

Before answering whether the lithium battery enclosure is made of steel or aluminum, we should first look at what are steel and aluminum, and what are their respective advantages and characteristics? As long as these are understood, the problem will be clear again.

Most of the early square lithium batteries were steel enclosure, which were mostly used in mobile phone batteries. Later, due to the low weight specific energy of steel shells and poor safety, they were gradually replaced by aluminum battery enclosure box and flexible packaging lithium batteries. However, among the column-type lithium batteries, there is another scene. Most manufacturers use steel as the battery enclosure material.

Because of the physical stability of the steel material, the pressure resistance is much higher than that of the aluminum enclosure material. After the design and structure optimization of various manufacturers, the safety device has been placed inside the battery core, and the safety of the steel enclosure column battery has reached a new level. At present, most of the battery cells of notebook computers use steel shells as carriers.

Aluminum enclosure is a lithium battery enclosure made of aluminum alloy material. It is mainly used in square lithium batteries. The reason why lithium batteries are packaged in aluminum shells is that it is lighter in weight and safer than steel shells. The aluminum enclosure alloy material structure has significant safety performance considerations, which can be expressed by material thickness and bulging coefficient.

The reason why a lithium battery with the same capacity is lighter than a steel case is that the aluminum case can be made thinner. From the perspective of the working mechanism of lithium batteries, when charging, lithium ions are deintercalated, and the volume of the positive electrode expands; when discharging, lithium ions are embedded from the positive electrode and the negative electrode expands; both will cause physical expansion, and the bulging coefficient can be reduced by appropriate alloy formulations.

After everyone understands the advantages and characteristics of steel enclosure and aluminum shell, you will know whether the battery enclosure is made of steel enclosure or aluminum shell! That's right, there is no way to tell the difference in such a comparison. After all, the focus of their application fields is still different. So it's not really comparable.