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Which is the difference between 18650 lithium cell and polymer lithium ion battery cell

In fact, polymer lithium batteries are also lithium batteries. Lithium cells are divided into liquid lithium ion cells and polymer cells. As for which of the two types of cells is more stable, it cannot be generalized. It depends on the technical level of the manufacturer.

Polymer core: soft aluminum-plastic composite packaging film is generally used. The interior is a semi-solid polymer. Stable performance discharge, high efficiency and small internal resistance. Good safety performance, with overcurrent and overvoltage protection devices. The service life is about 500 times of charging and discharging cycles. However, polymer cells are usually packed with tinfoil paper, which is easy to deform and not resistant to impact, and the quality of overvoltage protection is good or bad due to different manufacturers.

18650 cell: lithium-ion battery is an improved product of lithium-ion battery. After years of development, the technology of lithium-ion battery has been relatively mature, and mass processing has made its manufacturing cost very low. Therefore, lithium-ion battery has more advantages than lithium polymer battery in price. This is why most devices such as laptops now use this kind of cell.

At present, the 18650 lithium-ion battery with steel shell is the most commonly used in mobile power supply. It has a high safety factor, and its processing technology is very mature, and its price is cheaper than polymer battery. It occupies most of the market share of lithium-ion battery, which is the most common in notebook computer batteries.

Polymer lithium battery cells are generally made of lithium cobalt, lithium manganese and lithium ternary. It is made through a certain proportion of the mixture of the three and a certain technological process. The outer packaging is mainly made of aluminum plastic film, and the lithium material in the middle is paste. So the shape can be customized. At the same time, ultra-thin batteries, such as 0.33mm and 0.50mm, can be made.

The polymer lithium-ion battery is covered with a layer of aluminum-plastic film and a layer of high-temperature adhesive tape. The greatest safety of the polymer is found to be liquid leakage and short circuit, leading to package expansion. The worst case is combustion and fire. The 18650 lithium cell battery is sealed with steel or aluminum shell, and the internal pressure is huge. Once the internal overheating or improper operation causes the internal pressure to be concentrated and released into the external sealed steel or aluminum shell, its destructive force is like a small bomb.

Therefore, compared with 18650 lithium cell, polymer cell is safer. However, burning can also bring safety hazards, so it is recommended that users who use mobile power should not put mobile power on pillows or beds as much as possible.

Under the condition of cell quality assurance, the volume of 18650 lithium cell will be larger than that of polymer, so in terms of portability, polymer lithium cell will be more portable.

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