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After switching from the 18650 type to the 21700 type, the capacity of a single lithium-ion battery with 1 battery increased by 35%. Take the 21700 battery produced by Tesla as an example. The capacity of a single battery can reach 34.8Ah, significantly increasing by 35%.

The energy density of the 18650 battery system used in the early stage was about 250Whkg. Later, the energy density of the 21700 battery system produced by it was around 300Whkg, and the energy density of the 2 battery system increased by about 20%. Based on the data released by Tesla. The volume energy density of 21700 batteries is nearly 20% higher than the original 18650.

The price of the power lithium-ion battery system for the 21700 battery is $170/Wh, while the price of the 18650 battery system is $185/Wh. After using the 21700 battery on the Model 3, the cost of the 3 system is estimated to decrease by about 9%. Analysis of battery price information published by Tesla. The cost of the battery system alone can be reduced by about 9%.

The individual energy density is higher, and the estimated component of the 4-system decreases by about 10%. The overall volume of 21700 is greater than 18650 as the monomer capacity increases. So, under the same energy, the number of battery cells required can be reduced by about 13 to reduce the difficulty of system management, while also reducing the number of metal structural components and electrical accessories used in the battery pack, which further reduces the weight of the battery. After Samsung SDI switched to a new set of 21700 batteries, it was found that the system reduced the weight by 10% compared to the current battery.

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