What are the differences between 18650 lithium batteries and polymer lithium batteries?

What are the differences between 18650 lithium batteries and polymer lithium batteries? In fact, polymer lithium batteries are also lithium batteries. Lithium batteries are divided into two types: liquid lithium ion batteries and polymer batteries. As for which of the two batteries is more stable, this cannot be generalized. It depends on the technical level of the manufacturer. Polymer batteries: generally use soft aluminum-plastic composite packaging film. The inside is a semi-solid polymer. The performance discharge is stable, the efficiency is high, and the internal resistance is small. The safety performance is better, and there are overcurrent and overvoltage protection devices. The service life charge and discharge cycles are about 500 times. However, polymer batteries are usually packaged in tin foil, which is easy to deform, not resistant to impact, and the quality of overvoltage protection varies depending on the manufacturer. 18650 batteries: Lithium batteries are an improved product of lithium batteries. After years of development, the technology of lithium batteries is relatively mature, and mass processing has made their manufacturing costs very low. Therefore, the price of lithium batteries has more advantages than lithium polymer batteries. This is why this battery is currently used in most notebook computers and other devices. Nowadays, the 18650 lithium battery with steel shell is most commonly used in mobile power supply. It has a high safety factor. The processing technology is very mature, and the price is cheaper than polymer batteries. It occupies most of the lithium battery market share. The most common. Polymer lithium batteries are generally made of a mixture of lithium cobaltate, lithium manganate, and ternary lithium. Through a certain proportion of the three mixtures, it is produced by a certain process. The outer packaging is mainly made of aluminum-plastic film, and the lithium substance in the middle is paste-like. So the shape can be customized arbitrarily. At the same time, ultra-thin batteries can be produced, such as ultra-thin batteries such as 0.33mm and 0.50mm. The polymer lithium battery uses a layer of aluminum-plastic film and a layer of high-temperature tape. The greatest safety of the polymer is found to be leakage, short-circuit, and expansion. The worst case is burning and flames. The 18650 lithium cell battery is sealed with a 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 to the external sealed steel or aluminum shell, its destructive force will be Like a small bomb. Therefore, compared with 18650 lithium batteries, polymer batteries are better in terms of safety. But burning will also bring safety hazards, so it is recommended that users who use mobile power sources, try not to put mobile power sources on pillows, beds, and other places. In the case of battery quality assurance, the volume of the 18650 lithium battery will be larger than that of the polymer, so in terms of portability, the polymer lithium battery will be lighter. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of charging methods and precautions for lithium batteries of electric vehicles