Analysis of the advantages of 21700 battery

1. The energy density of the battery has improved by more than 20%. The energy density of the 21700 battery is better than that of the 18650 battery. According to the information released by Tesla, under current conditions, the energy density of its 21700 battery system is about 300Wh/kg, which is about 20% higher than the 250Wh/kg of its original 18650 battery system. From the detection data of Panasonic's power lithium battery cells, the volumetric energy density of its 21700 battery is much higher than that of the 18650 battery cell. The improvement of the energy density of a single cell is much higher than the 20% improvement of the group. 2. The cost of the battery system drops by about 9%. According to the battery price information published by Tesla, the price of the 21700 power lithium battery system is estimated to be 170 US dollars/KWh. Compared with the 18650 price, the price is 185 US dollars/KWh. The price drop can reach 8.1 %about. The cost of the 18650 system is about US$171/KWh. After switching to 21700, the cost of the system can be reduced by about 9%, reaching US$155/KWh. After the monomer capacity increases, the reduction in the number of parts required by the PACK will reduce the cost of the PACK. After switching from the 18650 type to the 21700 type, the battery cell capacity can reach 3~4.8Ah, which is a substantial increase of 35%. The number of batteries required under the same energy can be reduced by about 1/3. The TeslaModels electric car uses 7104 18650 battery strings. Parallel to form a battery pack, on the new Models3, after the 21700 is selected, the number of battery cells will be greatly reduced. While reducing the difficulty of system management, the number of metal structural parts and conductive connections and other accessories used by the battery pack will be reduced by the same share. Tesla's Pack cost accounts for about 24% of the total system cost. It is estimated that the battery pack cost will be reduced by a considerable amount. 3. Lightweight contribution Samsung said that after its switch to the new 21700 battery, the system can reduce the components and weight by 10% compared with the current battery, thereby further reducing the weight of the battery pack, and the energy density of the vehicle will be partially progress. 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: What are the challenges of hydrogen fuel-powered battery vehicles?