What are the advantages of polymer lithium-ion batteries compared with 18650 batteries?

18650 is a standard lithium-ion battery designed by Sony, the founder of lithium-ion battery, to save costs. Among them, 18 is a diameter of 10mm, 65 is a length of 65mm, and 0 is a cylindrical battery. Sony has been trying to make alkaline lithium-ion batteries, which have certain industry standards. 5 battery, no. 7 batteries are basically available all over the world. However, because the biggest advantage of lithium-ion batteries is that they can be designed according to customer needs and cannot have a unified standard, until now, the lithium-ion battery industry basically only has a standard model of 18650, so that large-capacity can be 3 series 11.1V lithium-ion batteries Group, if the application environment is different, it will also make it 14.8V rechargeable lithium ion battery, the battery or other surface is designed according to customer requirements, compared with 18650 battery, polymer lithium ion battery has the following advantages: 1. High energy density. The average 18650 battery capacity can reach about 2200mAh, and the energy density is about 500Wh/L, while the energy density of polymer batteries can be close to 600Wh/L when mass-produced. 2. Good security. We understand that under extreme conditions (such as overcharge, high temperature, etc.), a violent chemical reaction occurs inside a lithium-ion battery, and a large amount of gas appears. The 18650 battery is a metal case with a certain degree of strength. When the internal pressure reaches a certain level, the steel shell will burst and explode, causing serious safety accidents. This is why the room where the 18650 battery is tested usually must have multiple layers of protection and can never be used. Polymer batteries do not have this problem, even in extreme cases, because the packaging film has low strength, it will break as long as the pressure is slightly higher, and there will be no explosion. The worst case is burning. Therefore, the polymer battery is better than the 18650 battery in safety. This is a 18650 lithium ion battery, completely different from polymer batteries 3. It can be designed according to customer needs. This has already been said, so I will not repeat it. 4. The price is relatively high. The international price of 18650 is about 1.2USD/PCS, which is about 4RMB/Ah based on 2Ah. The price of polymer lithium-ion batteries is 4 yuan per ah for low-end cottage factories, 5-7 yuan per ah for mid-range, and more than 7 yuan per ah for high-end. Like ATL, ubet, and Lishen, they can generally sell for 10 yuan/piece. You are too young to be accepted by others. But polymer batteries also have their disadvantages. The important thing is the high cost, because it can be designed according to the customer's needs, and the research and development costs here will be calculated. Moreover, the shape is changeable and the variety is wide. As a result, all kinds of fixtures are non-standard parts in the manufacturing process, and the cost is correspondingly increased. The versatility of the polymer battery itself is poor. This is also due to the flexibility of its design. Customers are often redesigned in order to be 1mm worse. Of course, the cost is still the cost. What I said above is not absolute. 18650 also has high-end applications, such as the recently popular Tesla Model S, which uses the 18650 battery pack supplied by Panasonic. Therefore, 18650 does not represent the low-end, but the low-end manufactured by some domestic cottage factories. An old man said: Everyone is sitting here discussing the safety of next-generation lithium-ion batteries. What is the next generation of lithium-ion batteries? If there is a dispute about the meaning of the next generation, what is this generation of lithium-ion batteries? (silence for a few seconds) I think this generation of lithium-ion batteries is the representative of the 18650 battery. Just look at the battery pack of the smart home cleaning robot. The 18650 battery is designed to be used in small groups, so consistency is a high priority. Relatively speaking, the 18650 battery is the battery with the highest degree of automation and the best consistency. With regard to portable devices like mobile phones, the size design should be more flexible, so the size of 18×650 cannot be maintained, and it should not be particularly consistent. It is suitable for personal use. Seeing that you are not an 18650 lithium ion battery, you have your own opinions about the difference between polymer lithium ion batteries. In short, now the domestic 18650 lithium ion battery and polymer lithium ion battery pack are very mature, except for the B product battery or defective manufacturing. 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