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Jelly roll (battery)
The jelly roll or Swiss roll design is the design used in the majority of cylindrical rechargeable batteries, including nickel–cadmium (Ni-Cd), nickel-metal hydride (Ni-MH), and lithium-ion (Li-ion). The design has this name because the cross section of the battery looks like a Swiss roll. In this design, an insulating sheet is laid down, then a thin layer of an anode material is laid down, a separator layer is applied, and a cathode material is layered on top. This sandwich is then rolled up and inserted into a hollow cylinder casing. The battery is sealed, metal contacts are attached, and an optional button top is applied if the battery is intended to replace an AAA/AA/C/D alkaline battery. A label with the brand name is then applied, or a blank protective label, often green (for Ni-MH) or blue (for Ni-Cd) for a generic or OEM battery. Occasionally, the design is also used for primary (non-rechargeable) batteries, like lithium iron disulfide (Li-FeS2) patented by Energizer, although most common primary batteries use the conventional rod-paste-tube design, like the zinc-carbon and its successor the alkaline battery. The Swiss roll design is likewise used for the plates of cylindrical capacitors.[1][2] References
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