Why Tesla abandoned 18650 and switched to 21700 lithium batteries

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. Because if the energy density of the 18650 battery alone is compared with the energy density of the stacked battery, the 18650 is clearly dominant. But if the weight of the BMS battery management system is also included in the 18650 battery pack, the stacked battery will exceed 18650 in terms of energy density! Therefore, in order to determine the weight and cost, the easiest way is to replace the relatively outdated 18650 battery. The 21700 battery has a higher energy density than the well-known 18650 battery, and the cost will be reduced after grouping. In general, the 21700 maintains the high reliability and stable performance of the 18650 battery, and the battery performance is greatly improved compared to the 18650 in all aspects. Because the cylindrical battery product is very mature, it can be straight on the basis of the original 18650, by adding 3mm diameter and 50mm height to increase the volume, bringing greater mAh. In addition, due to the larger volume, the 21700 battery has also added multi-level electric ears to slightly increase the battery charging speed. In addition, as the volume of the battery becomes larger, the number of batteries in the vehicle as a whole will be relatively reduced, reducing weight and cost. The energy density of the 21700 battery is higher than that of the well-known 18650 battery, and the cost will be reduced after grouping. In general, the 21700 maintains the high reliability and stable performance of the 18650 battery, and the battery performance is greatly improved compared to the 18650 in all aspects. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Can the price of lithium iron phosphate battery drop?