In Reply to: Interesting study in Corp Sabotage posted by Dynobot on March 23, 2017 at 09:08:23:
LiFePO4 cells for phones/tablets are often in flexible foil packs, so they're easier to shoehorn into weirdly shaped places.
Cell expansion is well known and gets accounted for. Some surmise that it was the fast charging algorithm that put more stress on a cell, causing the electrolytes to heat up, vent some gas perhaps and expand the physical dimensions, not causing any shorts.
Problem is is that they'd have (and have) already tested this before and known that at a .5C (C=capacity of cell X) charge rate, the cell will be fine. At a 1C charge rate, mild heat and some expansion, at a 1.5C rate, expansion easy to detect and measure and finally, at a 2C rate, cell pouch ruptures due to heat/gas build up.
So...let's keep the charging rate down to a .75C rate as a fast charge option and be fine?
Anyhow...maybe there were some shenanigans?
Chris
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Follow Ups
- Not to belabor the Samsung issue, but... - Chris Garrett 10:03:43 03/23/17 (1)
- RE: Not to belabor the Samsung issue, but... - Dynobot 13:31:15 03/23/17 (0)