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

What is the difference between 18650 lithium ion batteries and polymer lithium ion batteries? Why are domestic 18650 lithium ion batteries and polymer lithium ion batteries generally not high? 18650 is just one size, indicating that the shape of the battery is 18mm in diameter and 65mm in height Cylinder. 18650 can be ordinary lithium cobalt oxide batteries, lithium iron phosphate batteries, lithium ion polymer batteries, as well as early nickel metal hydride and nickel cadmium (now almost no), in short, 18650 is just a form of packaging. The same square is not necessarily equal to the polymer. In addition to not being easy to build up pressure and explosion, the soft-packed lithium ion has the same safety performance as the steel shell, because it is easy to break without the protection of the steel shell! As long as there is a polymer in the electrode material or electrolyte Can become a polymer battery. Compared with ordinary liquid electrolyte lithium-ion batteries, the polymer is free in appearance, does not require high-strength containers, makes full use of space, and can be stacked inside to increase voltage. It is worth noting that both polymer batteries and ordinary lithium-ion batteries may catch fire, but all polymer batteries are much less likely to catch fire. But the real polymer is not completely beyond the ordinary lithium-ion battery, the first is the internal resistance, usually the internal resistance of the same capacity is greater than the ordinary lithium-ion polymer, you can use the soft pack 3.7V lithium polymer battery, lithium-ion battery The other is price. The average price of lithium-ion polymer is higher than the average, but the cost of thin polymer batteries is lower than that of ordinary lithium-ion. Energy is related to the weight of the general polymer and has an advantage, not the volume. From the perspective of battery internal materials, the so-called polymer lithium-ion battery refers to a lithium-ion battery using polymer as an electrolyte. Specifically, it can be divided into semi-polymer and full-polymer. Semi-polymer is a layer of polymer (usually PVDF) coated on the film to make the battery more compact and harder, and the electrolyte is still liquid electrolyte. And polymer means that the use of polymer gel network is formed in the cell, and then the electrolyte is injected into the electrolyte to form. Although the overall polymer battery will still use liquid electrolyte, many of them are used in a small amount, and the safety performance of lithium ion batteries Greatly improved, as far as I know, different lithium polymer batteries can be made into different batteries, the most basic is the 3.7V lithium polymer battery pack. In domestic battery manufacturers, there are many polymer batteries that produce this kind of flexible packaging. Polymer, perhaps only Sony is producing all-polymer lithium-ion batteries. This is a polymer lithium-ion battery. On the other hand, the polymer battery is a lithium-ion battery that uses aluminum-plastic packaging film as the packaging, usually called a soft pack battery. The packaging consists of three layers: polypropylene, aluminum and nylon. Because polypropylene and nylon are polymers, the battery is called a polymer battery. According to the difference between the 18650 lithium ion battery and the polymer lithium ion battery, it should refer to the latter battery, which is the so-called polymer packaging material lithium ion battery, and the corresponding 18650 battery uses a steel shell as the outer packaging. Many domestic manufacturers advertise that the batteries they produce are polymer batteries, which means the same thing, don’t be fooled by them~. 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 post: Which ternary lithium ion battery or lithium iron phosphate battery has a longer service life?