the battery used in BMW i3 is a cylindrical battery produced by LGChem of South Korea, instead of the blade battery used in some models such as BYD. Cylindrical battery is a common battery type, which is widely used in electric vehicles and other fields because of its small size, light weight, high safety and long life. In contrast, although the blade battery can improve the energy density of the battery pack, its application in the field of electric vehicles is still limited because of its complicated manufacturing process, high cost and difficult to guarantee safety. Therefore, it can be concluded that the BMW i3 is not a blade battery, but a cylindrical battery produced by LGChem of South Korea.