Are polymer batteries better than 18650 batteries

Full polymer refers to the use of polymer to form a gel network inside the cell, and then inject electrolyte to form an electrolyte. Although all polymer batteries still use liquid electrolyte, the amount is much smaller, which greatly improves the safety performance of lithium-ion batteries. As far as I know, only SONY is mass producing all-polymer lithium-ion batteries. From another aspect, polymer batteries refer to lithium-ion batteries that use aluminum-plastic packaging film as the outer packaging, which is commonly known as soft-pack batteries. This kind of packaging film is composed of three layers, namely PP layer, Al layer and nylon layer. Because PP and nylon are polymers, this kind of battery is called polymer battery. 1. The international price of the lower 18650 is about 1USD/pcs, which is about 3RMB/Ah if calculated according to 2Ah. The price of polymer lithium-ion battery is 4RMB/Ah for low-end cottage factories, 5~7RMB/Ah for mid-end, and 7RMB/Ah for mid-to-high end. Like ATL and Lishen, they can generally sell for around 10RMB/Ah, and you are not willing to pick them up when your order is small. 2, can not be customized SONY has always wanted to make lithium-ion batteries the same as alkaline batteries. There are certain industrial standards, just like AA batteries and AA batteries, which are basically the same all over the world. However, because a major advantage of lithium-ion batteries is that they can be designed according to customer needs, it is impossible to have a unified standard. So far, the lithium-ion battery industry basically only has a standard model of 18650, and the others are based on customers. Need to be designed. 3. Poor safety. We know that under extreme conditions (such as overcharge, high temperature, etc.), lithium-ion batteries will have violent chemical reactions inside, and a large amount of gas will appear. The 18650 battery uses a metal shell with a certain strength. When the internal pressure reaches a certain level, the steel shell will burst and explode, causing a terrible safety accident. This is why the room where the 18650 battery is tested generally must be protected by layers, and no one can enter during the test. Polymer batteries do not have this problem, even in extreme cases, due to the low strength of the packaging film, as long as the air pressure is slightly higher, it will rupture and will not explode. The worst case is combustion. So in terms of safety, polymer batteries are better than 18650 batteries. 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 article: Why has lithium-ion batteries for electric vehicles not been fully popular in the market?