What are the advantages of increasing the size of the cylindrical 18650 lithium battery to 21700?

The 18650 battery is a cylindrical lithium battery with a diameter of 18 mm and a height of 65 mm. Its biggest feature is that it has a very high energy density, almost reaching 170 watts/kg, so the battery is very cost-effective. We often see that it is usually the best. The battery, because it is a relatively mature lithium battery, has good quality in all aspects of system stability, and is widely used in a battery capacity of about 10KWH, for example, in mobile phones, notebook computers and other small electrical appliances. 21700 battery 21700 battery is a lithium battery with a diameter of 21 mm and a height of 70 mm. Because of its size, space utilization, energy density, battery cells and systems can be improved, its volumetric energy density is much higher than that of the 18650 battery, and it is widely used Used in digital, electric vehicles, balance, solar car lithium battery lights, LED lights, power tools, etc. Important processors of this battery include Tesla, Samsung, Panasonic, bic, and Mengshi New Energy. 18650 lithium battery. What are the benefits of adding the cylinder 18650 lithium battery size to 21700 by JPG? 1) When the energy density is appropriately increased, conventional materials can be selected, which has stable performance and high cost performance; 2) The multi-pole mechanism can be appropriately designed to reduce internal resistance; 3) Under the same energy density, graphite with fast charging characteristics can be selected to improve fast charging performance; 4) Appropriately increase the diameter and height to obtain a more effective volume. 5) The single cell capacity is increased, the proportion of auxiliary components is reduced, and the packaging cost is reduced. Advantages of 18650 lithium battery 18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, RoHS trademark certification; good high temperature performance, 100% power efficiency below 65 degrees. The 18650 battery is usually encapsulated in a steel shell. In extreme cases such as a car collision, the occurrence of safety accidents is reduced as much as possible, so as to achieve higher safety. The small size of the 18650 cylindrical lithium battery allows the energy of each battery to be controlled within a small range. Compared with the use of large-size batteries, even if one of the batteries fails, the impact of the failure can be reduced. The energy density is high. The capacity of the 18650 cylindrical lithium battery is generally between 1200mah and 3600mah, while the general battery capacity is only about 800mah. If combined into a 18650 lithium battery pack, the 18650 lithium battery pack can exceed 5000mah. The new 21700 battery has four significant advantages: 1. The single capacity of lithium battery has increased by 35%. Take 21700 batteries processed by Tesla as an example. After switching from the 18650 model to the 21700 model, the single battery capacity can reach 3~4.8ah, a significant increase of 35%. 2. The energy density of the battery system has increased by about 20%. According to the data released by Tesla, the early stage of use in the energy density battery system in 18650 is about 250wh/kg, and after the appearance of the energy density battery system in 21700, it is about 300wh/kg. The energy density and volume of the 21700 battery are compared to the original 18650 rose nearly 20%. 3. The cost of the system is expected to drop by about 9%. According to the analysis of battery price information disclosed by Tesla, the price of the 21700 battery power lithium battery system is 170 US dollars/Wh, and the 18650 battery system price is 185 US dollars/Wh. After installing 21700 batteries on the Model 3, the cost of the battery system alone can be reduced by about 9%. 4. The weight of the system is expected to be reduced by about 10%. The total capacity of 21700 is greater than 18650. As the monomer capacity increases, the energy density of the monomer is higher, so the number of monomers required for the same energy can be reduced by about 1/3. Maintaining the high reliability and stable performance of the 18650 cylindrical lithium battery, the performance of the 21700 battery is greatly improved compared to the 18650 battery in all aspects. In addition, compared with other types of batteries, the 21700 battery is similar to the more mature 18650 battery in raw material selection, manufacturing process and technical process. Therefore, the processing lines of 18650 and 21700 are basically compatible. 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: How to make the battery of mobile phones and other devices more durable?