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In recent years, with the rapid rise of new energy electric vehicles in the world, lithium battery has also become the focus of attention. Take Tesla for example. It's cool and cool. It is said that Tesla tested many kinds of batteries during the development of electric vehicle batteries, and finally took 18650 cells as the technical route of new energy electric vehicle batteries. So why did Tesla finally announce to use 21700 lithium-ion batteries?

18650 is a standard lithium-ion battery model set by SONY in Japan in order to save costs. As a traditional battery cell, 18650 has relatively mature technology and strong adaptability. It can be digested in 3C digital, UAV, electric tools and other fields. It is the earliest commercialized, the highest degree of production automation, and the lowest current cost of a power lithium battery. The 21700 lithium-ion battery is a new model developed to meet the requirements of electric vehicles for longer mileage and to improve the effective utilization of vehicle battery space.

Electric Vehicle Resource Network

From the most intuitive comparison diagram, 21700 has a larger specification, where 21 represents the diameter of 21mm and 70 represents the length of 70mm.

Electric Vehicle Resource Network

After the 18650 model is switched to the 21700 model, the single battery capacity of the battery can reach 3~4.8Ah, a significant increase of 35%, and the number of batteries required under the same energy can be reduced by about 1/3.

The energy density of the 21700 battery system is about 300Wh/kg, which is about 20% higher than the 250Wh/kg of the 18650 battery system.

The price of 21700 power lithium-ion battery system is 170 US dollars/KWh, which is about 8.1% lower than the price of 18650 US dollars/KWh. The cost of the 18650 system is about $171/KWh. After the 21700 system is used, the system cost can be reduced by about 9% to $155/KWh. This performance is quite good.

The energy density of the 21700 battery is higher than that of the 18650 battery, and the cost will be reduced after grouping. In general, the 21700 has maintained the high reliability and stable performance of the 18650 battery, and the battery performance has been greatly improved compared with the 18650 in all aspects.

Tesla CEO Musk said that the power density of the 21700 battery is currently the highest in the world, and the price will be more approachable. With the rapid development of the new energy vehicle market, the eyes of domestic battery manufacturers are bright. It is understood that Bicke, Mengshi New Energy, Foster, Tianpeng and other companies intend to put 21700 batteries into production in the future production expansion, and it is expected that the 21700 batteries will probably usher in a considerable increase period in the future.

Although 18650 was accompanied by the rise of Tesla, as far as the current data are concerned, 21700 batteries can better meet the requirements of electric vehicles for battery performance. With the obvious advantages of 21700 battery and Tesla's industry influence, it is predicted that this battery is likely to become the next development trend of cylindrical battery.

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