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Advantages of Tesla's new 21700 battery

Like the 18650 battery, the Tesla 21700 battery is also one of the cylindrical lithium-ion batteries. Among them, 21 refers to the battery with a diameter of 21 mm, 70 refers to the height of 70 mm, and 0 refers to the cylindrical battery.

(1) The capacity of single battery is increased by 35%. Taking the 21700 battery produced by Tesla as an example, after switching from 18650 model to 21700 model, the single battery capacity of the battery can reach 3~4.8Ah, a significant increase of 35%.

(2) The energy density of the battery system is increased by about 20%. According to the data disclosed by Tesla, the energy density of the 18650 battery system used in the early stage is about 250Wh/kg. Later, the energy density of the 21700 battery system produced by Tesla is about 300Wh/kg. The volume energy density of the 21700 battery is nearly 20% higher than the original 18650.

(3) The cost of the system is expected to decrease by about 9%. According to the analysis of battery price information disclosed by Tesla, the price of 21700 battery power lithium-ion battery system is $170/Wh, while the price of 18650 battery system is $185/Wh. After using 21700 batteries on Model 3, the cost of battery system alone can be reduced by about 9%.

(4) The weight of the system is expected to decrease by about 10%. The overall volume of 21700 is larger than 18650. With the increase of monomer capacity, the energy density of monomer is higher, so the number of battery monomers required under the same energy can be reduced by about 1/3. While reducing the difficulty of system management, the number of metal structures and electrical accessories used in the battery package will also be reduced, which further reduces the weight of the battery.

Some 18650 battery companies in China have expressed their approval of Tesla 21700 line and are also carrying out relevant layout. If the company itself is not strong enough to improve the material performance through research and development, the most direct way to improve the energy density is to make a large scale through physical means to improve the energy density. Bike, Foster, Mengshi, Tianpeng and other cylindrical battery companies have announced that they will put 21700 batteries into production in the future production expansion.

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