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[TheSun] Samsung S7 Edge overheats and explodes in a cafe

post #1 of 48
Thread Starter 
Quote:
Supply teacher Sarah Crockett, 30, told how the phone blew up in a busy cafe even though it was not being charged.
Previous incidents have happened when they have been plugged in, although a similar case to Sarah’s has also emerged in the US.
Mum-of-two Sarah, 30, was with husband Matt, 29, when her three- month-old mobile started to balloon in size before melting in clouds of white smoke in Witham, Essex.

She said: “It suddenly just expanded in my hand and got really, really hot.

“I dropped it on the table. Within a few seconds there was smoke everywhere and I jumped out of the way. The whole thing was just barbecued.









Source:https://www.thesun.co.uk/news/1772176/samsung-s7-edge-overheated-and-then-exploded-in-teachers-hands-in-the-middle-of-busy-cafe/



Apparently it also happened in the US.
Quote:
Q&A

WHAT is causing this overheating problem?

Samsung says it will investigate Sarah’s case.

It could be because of dodgy batteries like some in the Note 7.

But as there have been so few cases, it might be that these are one-off problems.

If the handsets have been charged with dodgy leads — such as those bought in markets — they might have previously damaged the batteries so they overheat.

What should I do if I have an S7 or S7 edge?

Samsung says there are no known problems with the S7 and have no recall plans. That means they think these are very rare cases.

But if your phone is overheating regularly contact your network.

So is it a problem if I am using another charger?

Tech giants always tell you to use the lead and plug in the box as they have been properly tested.

Normally, it is fine if you swap them between a Samsung and a Sony or HTC.

But if you buy a replacement, watch out for cheaper ones from markets, eBay or phone repair shops.

Genuine ones from Currys or Carphone Warehouse will not damage your battery.
Quote:
A GALAXY S7 Edge owner badly burnt when his phone exploded in his trouser pocket is suing Samsung.

According to the £11,000 US claim filed in a New Jersey court, Daniel Ramirez heard it whistling and screeching before it burst into flames.

The Californian project manager needed skin grafts for second-degree leg burns.
Graphic Image (Click to show)
post #2 of 48
Battery expansion isn't caused by heat. It is related to chemicals in the battery going solid -> gas. This is normally caused by faulty charging/discharging circuitry or/and a bad battery.

Solids become gas -> Gas ignites somehow -> Heat and explosion.
Edited by Seronx - 9/13/16 at 1:26am
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post #3 of 48

Removed.


Edited by asciii - 7/8/17 at 11:38pm
post #4 of 48
Quote:
Originally Posted by Seronx View Post

Battery expansion isn't caused by heat. It is related to chemicals in the battery going solid -> gas. This is normally caused by faulty charging/discharging circuitry or/and a bad battery.

Solids become gas -> Gas ignites somehow -> Heat and explosion.

Yes and no. Heat (energy loss from the discharge) weakens the battery casing and isolation. Which in turn allows for oxygen to reach the Lithium (which is highly flammable, it ignites spontaniously on contact with oxygen at room temperature). The Lithium oxidises (exothermic reaction), expands and releases gasses (CO2 if I'm not mistakes with Lithium-polymer batteries).
The explosion is the combination of fast expansion (volume increase after reacting into CO2) and the heat caused by the combustion.

I suspect the problem has something to do with high powerdraw (which puts a big load on the battery -> more heat -> more stain on the sealing) and a low-quality battery (or at least its sealing).
   
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post #5 of 48
Quote:
Originally Posted by Seronx View Post

Battery expansion isn't caused by heat. It is related to chemicals in the battery going solid -> gas. This is normally caused by faulty charging/discharging circuitry or/and a bad battery.

Solids become gas -> Gas ignites somehow -> Heat and explosion.

Can you back this up? It's different to what most are claiming as the cause but seems more correct than what most are saying - blaming it on cheap Chinese charging cables.
post #6 of 48
Quote:
Sony Energy Devices (Sony), the maker of the lithium-ion cells in question, says that on rare occasions microscopic metal particles may come into contact with other parts of the battery cell, leading to a short circuit within the cell. Although battery manufacturers strive to minimize the presence of metallic particles, complex assembly techniques make the elimination of all metallic dust nearly impossible.

A mild short will only cause an elevated self-discharge. Little heat is generated because the discharging energy is very low. If, however, enough microscopic metal particles converge on one spot, a major electrical short can develop and a sizable current will flow between the positive and negative plates. This causes the temperature to rise, leading to a thermal runaway, also referred to 'venting with flame.'

Lithium-ion cells with cobalt cathodes (same as the recalled laptop batteries) should never rise above 130°C (265°F). At 150°C (302°F) the cell becomes thermally unstable, a condition that can lead to a thermal runaway in which flaming gases are vented.

During a thermal runaway, the high heat of the failing cell can propagate to the next cell, causing it to become thermally unstable as well. In some cases, a chain reaction occurs in which each cell disintegrates at its own timetable. A pack can get destroyed within a few short seconds or linger on for several hours as each cell is consumed one-by-one. To increase safety, packs are fitted with dividers to protect the failing cell from spreading to neighboring cells.

http://batteryuniversity.com/learn/archive/lithium_ion_safety_concerns
post #7 of 48
claiming ONLY for £11,000?

wow....I mean....dude phone is dead, important message histories and photos, etc, are all gone, dude himself went through an explosion with pretty severe burn. His body will never look the same.

all that for £11,000? I would have tried at least £80,000. It's not too crazy to say that the phone almost killed him
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post #8 of 48
Quote:
Originally Posted by HarrisLam View Post

claiming ONLY for £11,000?

wow....I mean....dude phone is dead, important message histories and photos, etc, are all gone, dude himself went through an explosion with pretty severe burn. His body will never look the same.

all that for £11,000? I would have tried at least £80,000. It's not too crazy to say that the phone almost killed him
With the right lawyer he could have pulled six digits....I hope my S7 Edge blows up now.
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post #9 of 48
Quote:
Originally Posted by Wiz766 View Post

With the right lawyer he could have pulled six digits....I hope my S7 Edge blows up now.

just make sure you always wear pants that don't have pockets reaching to the middle area redface.gif
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post #10 of 48
You guys think they'll recall the S7 Edge too?
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