Talk:Jelly roll (battery)
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This article explains nothing[edit]
What are the benefits of using a jelly roll design needs to be explained. Surface area of battery needs to be discussed.--64.134.171.16 (talk) 21:46, 9 May 2016 (UTC)
- You have to make it somehow. Large surface area is useful because it gives current capacity. Thin layers are useful because they're the most efficient use of bulk reagents relative to area. If you have a large thin sheet to put into a small package, then roll it up. A cylindrical roll is easy, and matches the legacy packages for zinc carbon cells with a central rod. A flat roll (cellphone battery) has similar advantages, but in a flat package of novel shape. Dense batteries (quadcopter drones) use a form factor somewhere inbetween, giving a squarish prismatic bar, longer than its roll diameter.
- Old NiCds used a different form altogether. DEAC (other makes too, but I think DEAC invented these, thus gave them their generic name) used button cells, usually welded into stacked battteries. There were shallow metal pans, an inch or so across, filled with a stack of interleaved wire gauze discs. They had far lower energy densities than modern NiCd or NiMH cells. Andy Dingley (talk) 23:15, 9 May 2016 (UTC)