What is the difference between 18650 lithium battery cell and lithium polymer battery?

What is the difference between 18650 lithium battery cell and lithium polymer battery?

18650 battery cell：
18650 on the market is commonly lithium iron phosphate and lithium manganese and three.
The 18650 cell is usually cylindrical, and usually uses steel shell packaging. Because the lithium ions in 18650 appear to be liquid, like a glass filled with water, 18650 can only be cylindrical.
The danger of 18650 is still high, because the packaging of 18650 is generally made of steel shell. If the manufacturer has problems in the production and the quality is not up to standard, it is easy to have explosion problems.

Lithium polymer cell：
Lithium polymer cell, the raw material is generally lithium cobalt, lithium manganese, and lithium ternary mixed. Through a certain proportion of the mixture of three, with a certain process to produce, the outer packaging is important to use aluminum plastic film, the lithium material in the middle of the paste. The shape can be customized.
The biggest safety problem of lithium polymer core is that leakage and short circuit may lead to bulge problems, which in the most serious case will cause combustion phenomenon, the emergence of flames.

Compare 18650 cell and lithium polymer cell：
The raw materials of 18650 cell and lithium polymer cell begin to differ. The raw materials of 18650 cell are lithium iron phosphate, lithium manganate and ternary, etc., and the raw materials of lithium polymer cell are generally lithium cobalt acid, lithium manganate, and lithium ternary and other materials mixed. The former has a single raw material, while the latter has abundant raw materials.

The safety of the two is also very different, 18650 cell because of the steel shell packaging, so it is very likely to explode when the production quality is not up to standard. However, beginners who want to assemble may not be able to tell whether the 18650 cells they trade are of good quality. For beginners, the difficulty of getting started with 18650 cells is not recommended.

The safety of the lithium polymer cell is higher than that of the 18650 cell, because the packaging structure of the lithium polymer cell is a layer of aluminum plastic film and a layer of high-temperature adhesive cloth. More serious accident phenomenon is the occurrence of combustion, rather than a direct explosion.