What is the difference between 18650 batteries and polymer batteries?

18650 is the industry's statement, which refers to the battery with a diameter of 18mm and a length of 65mm. The cylindrical battery is mainly produced by large manufacturers such as Sanyo, Panasonic, Samsung, and Sony. There are also some manufacturers in my country that produce 18650, but the reputation and reputation The impact is not as great as the three mentioned above. Because of the acquisition of Sanyo, Panasonic has in fact become the largest production plant of 18650 in the world. 18650 capacity convention size: generally there are 2200mAh, 2400mAh, 2600mAh capacity standards. According to industry sources, the 18650 has now achieved the largest single-cell capacity of 3400mAh. If the mobile power supply uses 18650 as the battery core, it is basically connected with the above several standards. 18650 packaging: 18650 is generally packaged in steel, that is, the lithium ion of 18650 is liquid, like a cup filled with water, similar to this understanding. Therefore, the 18650 can only be cylindrical. If everyone is buying a power bank and see a thick and large power bank, they are basically 18650 batteries. 18650 safety: the picture comes from the Internet. This is a scene of the blasting of a laptop battery. Due to the special nature of the 18650 packaging (steel shell is selected), if the quality of the product is not good enough, the biggest danger is blasting. In the past few years, the laptop The blasting incident occurred because of problems with the quality control of Sony’s laptop batteries (usually 18650). Lithium polymer batteries Lithium polymer batteries are generally made of a mixture of lithium cobaltate, lithium manganate, and ternary lithium. Through a certain proportion of the mixture of the three, 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 at will. Together, it can produce ultra-thin batteries, such as 0.33mm, 0.50mm ultra-thin batteries. Lithium polymer battery cell capacity: because the polymer battery can be arbitrarily large and small, it does not have a standard shape, and the general volume is marked as length * width * thickness. In addition, the battery has a positive and negative service, which is long and wide. 0.5mm, the thickness is 0.55mm (the two positive and negative functions, the author has some unclear memories, does not know whether they are correct, but does not affect the reading of ordinary users, so it is clarified.) The polymer is based on the size of the volume. The size that determines the capacity is also related to the ratio of the lithium raw materials used. The safety of lithium polymer batteries: The picture comes from the Internet, this is a burned out mobile phone. A layer of aluminum-plastic film is used on the outside of the polymer battery, and a layer of high-temperature adhesive tape is used on the outside. The greatest safety of the polymer is found to be leakage, short circuit, and expansion. The worst condition is burning and flames. Therefore, compared with 18650, polymer batteries are better in terms of safety. However, incineration will also bring safety hazards, so it is recommended that users who use mobile power sources, try not to place mobile power sources on pillows, beds, etc. Now in the mobile power market, 18650 is still the largest shipment, among which the more characteristic is Yubo, most of the mobile power uses 18650. In addition, the 88-yuan Pinneng PN052 sold on Taobao is also 18650 in two sections. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the types of lithium-ion batteries?