fizz57
Bingo. The "Case" contains eight batteries. Each battery has three "cells". Each "cell" is one electrode, ten metres long, 150 millimeters wide, wound (folded) to fit in the prismatic container. Each electrode has 35k square centimeters of surface area. Each time a pin sized aperture in the polypropylene separator melts or is occluded, efficiency drops, heat is created, and the battery loses efficiency.
The "cell" in its multiple "folds" presents as a brain, or kidney would, layer upon layer of organic material.
Hence the CT scan. Not that it would help an in service Cell.
Once again, I repeat. A circular, cylindrical wind is preferred, "folding" is problematic for the very thin separator.
http://www.nfpa.org/assets/files/pdf...rieshazard.pdf
It's in there. I posted the pertinent part from the website in TechLog. #525