Why did Tesla abandon 18650 and use 21700 lithium batteries?

Why did Tesla abandon its old partner 18650 and chose 21700 lithium batteries? As a traditional battery, 18650 has more mature technology and strong adaptability, when the cost of the battery is the lowest. The 21700 lithium battery is a new type of battery developed in order to meet the travel distance requirements of electric vehicles and make full use of the battery space of the vehicle in front. 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. Considering that only the energy density of the 18650 battery is compared with the cascade battery, the 18650 is significantly better than the cascade battery. But assuming that the weight of the BMS battery processing system is also included in the 18650 battery pack, the cascade battery will have a higher energy density than the 18650! So in order to determine the weight and cost, the simplest solution is to replace the relatively outdated 18650 battery. The 21700 battery has a higher energy density than the more familiar 18650 battery, and the cost as a group is reduced. In general, the 21700 adheres to the high reliability and stable functions of the 18650 battery. The battery functions are more advanced than the 18650 in all aspects. Since cylindrical battery products are now very mature, the volume can be directly increased from the original 18650 to a larger milliampere hour by increasing the height of 3mm in diameter to 50mm. In addition, due to the larger size, the 21700 battery has also added a multi-stage electric ear battery for a slightly forward charging speed. Moreover, as the volume of the battery increases, the total amount of the battery will be relatively reduced, reducing weight and cost. The 21700 battery has a higher energy density than the more familiar 18650 battery, and the cost as a group is reduced. In general, the 21700 adheres to the high reliability and stable functions of the 18650 battery. The battery functions are more advanced than the 18650 in all aspects. 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: The difference between soft pack lithium battery and aluminum shell battery