What is the difference between 18650 batteries and polymer batteries? Who is safer?

What is the 18650 battery cell? At present, there are generally two kinds of battery cells in the mobile power market, one is the 18650 battery cell, and the other is the polymer battery cell. These two batteries dominate the market with a large share of the lithium-ion battery industry. Many netizens mentioned mobile power batteries, the author hereby makes an explanation on the two common batteries of mobile power. 18650 battery cell 18650 is a standard lithium-ion battery model set by SONY company in Japan in order to save cost. 18 means diameter is 18mm, 65 means length is 65mm, 0 means cylindrical battery, common 18650 battery Divided into lithium-ion batteries, lithium iron phosphate batteries. Lithium-ion polymer batteries Lithium-ion polymer batteries are generally made from a mixture of lithium cobaltate, lithium manganate, and ternary lithium ions. 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 ion substance in the middle is paste. 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 capacity of the lithium ion polymer battery cell can be any size. It does not have a standard shape. The general volume is marked as length * width * thickness. In addition, the battery has a positive and negative tolerance, and the length and width have a positive tolerance of 0.5mm. , The thickness of the negative tolerance is 0.55mm (the two positive and negative tolerances. Therefore, it is explained that the size of the polymer is determined by the size of the volume, and it is also related to the ratio of the lithium ion raw materials used. Lithium ion polymer A layer of aluminum-plastic film is used on the outside of the cell safety polymer battery, and a layer of high-temperature tape is covered. The greatest safety of the polymer is found to be leakage, short-circuit, leading to bag expansion, and the worst case is burning and flames. . Therefore, compared with 18650, polymer batteries are better in terms of safety. However, burning 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, bed and other places. At present In the mobile power market, the shipment volume is still 18650, and the vast majority of mobile power supplies use 18650. At present, most of the high-end mobile power market uses polymer batteries to make mobile power sources. To a moderate extent, it is better for users to buy power banks with Polyhewu batteries, especially mobile power banks with large capacity, such as 8000mA or more. If there is a safety accident, it is not fun, and mobile power banks with polymer batteries , The most is a small spark, it is unlikely to explode. Statement: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous article: Detailed explanation of 18650 lithium ion battery capacity measurement method