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In Reply to: RE: No, they don't... posted by PAR on March 22, 2017 at 00:23:37:
in that how does a company that uses supposedly good quality cell manufacturers all of a sudden get a crappy batch of batteries/cells?
Some surmise that it wasn't the cell maker that was the problem, but that their fast charge BMS (battery management system) was the actual culprit. However, that doesn't make sense, since charging algorithms are pretty well established--being CC/CV--constant current/constant voltage and charging at X, Y or Z rates is withing parameters.
Others surmise that heat was the issue (cramped battery/cell,) but that should have all been known beforehand. Some believe that the internal spacing of the cell, to the phone, was too cramped and heat built up.
LiFePO4 chemistries are the safest, only because they have a higher thermal runaway point than traditional lithium-cobalt (260ish* F,) not seen any longer vs. lithium-manganese (290ish* F) vs. lithium-iron (300+* F), but we don't use the former two in these types of devices.
Don't know for sure, as there are more 'forgiving' chemistries that are typical, but good cells and good chargers go a long way in mitigating 'ka-booms'.
Chris
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Follow Ups
- The Samsung fiasco was an interesting study... - Chris Garrett 00:42:37 03/22/17 (5)
- Interesting study in Corp Sabotage - Dynobot 09:08:23 03/23/17 (2)
- 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)
- Problem has been studied to death... - Ivan303 07:38:20 03/22/17 (1)
- Committed to Quality - AbeCollins 08:31:14 03/22/17 (0)
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