The traction battery market has already passed the stage of development when it was possible to endlessly experiment with the cell sizes used.Samsung SDI first wanted to increase the diameter of its cylindrical lithium batteries to 40 mm, but now Korean sources say that the reference point is the diameter of similar cells from Tesla, which reaches 46 mm.Image source: Samsung SDI If you consider that the cylinder height was originally supposed to be 80 mm, then Samsung SDI can achieve full unification in size with the cylindrical cells 4680, which begin producing Tesla and its close partner, Panasonic.However, LG Energy Solution is also experimenting with the creation of such batteries, so all three third-party manufacturers could eventually become suppliers of cells like 4680 to the Tesla assembly line.According to Business Korea, Samsung SDI now produces cylindrical lithium batteries in two sizes: 2170 and 1865, where the first two digits define the diameter of the cylinder and the second two define its height in millimeters.Work on the standardization of the third size is coming to an end, and Samsung SDI is inclined to choose the diameter of 46 mm as a basis.What will be the height of the cylinder, has not yet been decided, but for the purpose of unification, it will probably reach 80 mm, inherent in the products of Tesla, Panasonic and LG Energy Solution.According to SNE Research, now the cylindrical batteries account for 19% of the traction battery market, but by 2030 they will reach 26%.The alternatives are either prismatic hard-shell batteries or packaged soft-shell batteries.Samsung SDI is going to ramp up production of cylindrical-shaped batteries at its facilities in South Korea and Malaysia.
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