What are the important advantages of the 18650 lithium-ion battery compared with the lithium-ion battery?

The meaning of 18650 lithium ion battery is 18 mm in diameter and 65 mm in length. The AA battery model is 14500, 14 mm in diameter and 50 mm in length. Generally, 18650 batteries are used in domestic production and are rarely used for civilian use. The common ones are also used in notebook batteries and advanced flashlights. 18650 Li-ion battery charging control is divided into two stages. The first stage is constant current charging. When the battery voltage is lower than 4.2V, the charger will charge with a constant current. The second stage is the constant voltage charging stage. When the battery voltage reaches 4.2V, due to the characteristics of lithium-ion batteries, if the voltage is higher, it will be damaged. The charger will firmly hold the voltage at 4.2V and the charging current will gradually decrease. When the current decreases to a certain value (generally 1/10 configuration current), the charging circuit is cut off, the charging completion indicator light is on, and the charging is completed. The advantages of 18650 lithium-ion batteries over general lithium-ion batteries are: 1. Large capacity: the capacity of 18650 lithium-ion batteries is generally between 1200mah and 3600mah, while the capacity of general lithium-ion batteries is only about 800. 18650 lithium ion battery pack, that 18650 lithium ion battery pack can break 5000mah casually. 2. Long life: 18650 lithium-ion battery has a long service life, and the cycle life can reach more than 500 times under normal use, which is more than twice that of ordinary batteries. 3. High security function: 18650 lithium ion battery has high security function, no explosion, no burning; non-toxic, no pollution, and RoHS trademark certification; various security functions can strike iron while hot, and the number of cycles is greater than 500; high temperature resistance performance, 65 The discharge efficiency reaches 100% under high temperature conditions. 4. High voltage 18650 Li-ion battery voltage is generally 3.6V, 3.8V and 4.2V, much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries. 1. Lower value The international value of 18650 lithium-ion batteries is about 1USD/pcs. If calculated on the basis of 2Ah, it is about 3RMB/Ah. The value of polymer lithium-ion batteries is 4RMB/Ah for low-end copycat factories, 5~7RMB/Ah for mid-range, and more than 7RMB/Ah for mid-to-high end. Products like ATL and Lishen can generally sell for about 10RMB/Ah, and you are not willing to accept them when you are too small. 2. No custom-made SONY has always wanted to communicate with lithium-ion batteries as imaging alkaline batteries. There is a certain domestic standard, just like AA and AAA batteries, the world basically communicates. However, one of the major benefits of lithium-ion batteries is that they can be designed according to customer needs, and cannot have a unified standard. So at this moment, the lithium-ion battery industry has only a standard model of 18650, and the others are based on customers. Need to organize the design. 3. Poor safety. We know that under extreme environments (such as overcharge, high temperature, etc.), lithium-ion batteries will generate violent chemical reactions and present a large amount of gas. The 18650 lithium-ion battery uses a metal shell, which has a certain strength. When the internal pressure reaches a certain level, the steel shell will split and explode, resulting in terrible peace and disorder. This is why the room where the 18650 battery is tested generally must be covered by layers, and no one can enter during the test. Polymer batteries do not have this problem. Even in the same extreme environment, due to the low strength of the packaging film, as long as the air pressure is slightly higher, it will split and will not explode. The worst environment is combustion. Therefore, in terms of safety, polymer lithium-ion 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 post: What are the basic factors that affect the storage performance of lithium-ion battery packs?