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Registered ConfUser
Join Date: Aug 2006
Location: Waterlogged
Posts: 23,408
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I-phone 7: Fire?
Apple investigating claim iPhone 7 caught fire - Business Insider
Wonder if Apple uses similar battery technology to Samsung's Note 7. Should be interesting.
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Mike “I wouldn’t want to live under the conditions a person could get used to”. -My paternal grandmother having immigrated to America shortly before WWll. |
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10-21-2016, 06:04 PM
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Free minder
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They all use Li-ion batteries, but Samsung makes their own while Apple buys them form several companies.
There are several types of safety features built inside the cells, especially the separators and electrolyte. There are also several variants of Li-ion cathode chemistries, some safer than others. When companies push the enveloppe too far to reduce cost and increase energy density, safety gets compromised...
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/ 2014 Cayenne platinum edition 2008 Benz C300 (wife’s) 2010 Honda Civic LX (daughter’s) |
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10-21-2016, 07:07 PM
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Free minder
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In Li-ion cells, overcharge is dangerous because it may create lithium dendrites that poke through the separator and create a short through which the cell discharges instantly. The very high current flowing through the dendrite causes a very hot spot which ignites the electroyte, and poof, there goes your cellphone in smoke.
The BMS is designed to prevent overcharge, but it cannot really detect if an overcharge condition is occuring locally on the electrode. Apparently the issue with Samsung cells was pressure differences on the cell stack causing local overcharge conditions.
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/ 2014 Cayenne platinum edition 2008 Benz C300 (wife’s) 2010 Honda Civic LX (daughter’s) |
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10-21-2016, 07:27 PM
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Free minder
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The other theory I read is that Samsung tweaked the BMS to enable faster charging. Fast charging increases the risk of lithium plating, causing shorts and explosions. That would explain why replacing the phones with new batteries did not fix the issue, because the issue was not the battery itself, but the way it was managed by the phone.
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/ 2014 Cayenne platinum edition 2008 Benz C300 (wife’s) 2010 Honda Civic LX (daughter’s) |
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10-22-2016, 01:59 PM
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Banned
Join Date: May 2006
Location: Dana Point, Ca
Posts: 55,591
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probably a Samsung operative trying to make it look bad, see, everybody does it.
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10-22-2016, 02:06 PM
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Registered
Join Date: Nov 2000
Location: AZ
Posts: 8,414
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If nothing else, Apple seems to be better at damage control. There have been numerous instances of battery fires with previous iPhone versions as well, including one that exploded/caught fire on a commercial flight. However, I don't recall any "banning" of the iPhone anywhere. So, it would appear they (Apple) seem to enjoy more leeway and/or more insulation from criticism that their competitors (namely Samsung). Strange...
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10-22-2016, 02:25 PM
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Banned
Join Date: May 2006
Location: Dana Point, Ca
Posts: 55,591
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Quote:
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10-22-2016, 02:50 PM
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Registered
Join Date: Jan 2007
Posts: 11,758
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It could simply be raw numbers of failures.
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10-22-2016, 02:53 PM
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canna change law physics
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There were less than 10 Galaxy Note 7 phones that caught fire
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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10-23-2016, 03:19 AM
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1970/1982 Porsche 914-6/911SC 2.7 RS
