Cylindrical lithium battery energy storage box structure

The cans for the 18650 and 21700 are made from nickel plated steel and deep drawn in a two-stage process. The result is the base of the can is thicker than the cylindrical side wall. 1. 18650 1.1. Base thickness ~0.3mm 1.2. Wall thickness ~0.22 to 0.28mm 2. 21700 2.1. Base thickness ~0.3 to 0.4mm 2.1. Wall thickness ~0.22 to. . Cylindrical cells are used in numerous applications and cooling varies from passive through to immersed dielectric cooling. The diameter, length and connection of the jelly roll to the outer case all have an impact on the.