At the 2021CIBF battery exhibition that opened on March 19. Dr. Lin Jian, chief scientist of BAK Battery, revealed that BAK is cooperating with a number of domestic and overseas customers on the application and development of all-terminal large cylindrical batteries. 4680 battery cell samples are expected to be mass-produced within this year.

Compared with the previous 18650 and 21700 batteries, the large cylindrical battery represented by 4680 adopts the full tab technology, which can not only increase the size of the single battery cell and increase the space utilization rate under the premise of ensuring the safety of the entire battery pack, it can also increase the mileage of the vehicle. At the same time, the full tab technology can also solve the power performance bottleneck of the cylindrical cell. This is also the main reason why Tesla has set its sights on the 4680 battery.