Hello folks ,i am sushil briefly talking about the samsung’s flaw full phone.
Yes this is regarding the samsung note 7 which has been declared as a phone that has explodes. certainly, because of this fame received by the company this phone made it to the game gta 5 and was also used as an explosive. it was funny, i will leave a link which would show you the gameplay .
i know the fact that the phone explodes and that too because of over charging and sort of reasons . but what has happened wrong in the manufacturing of the phone that has made it to explode.
The science behind phone battery fires is actually pretty simple, and fairly well understood. Much like the infamous exploding hoverboards, phones use lithium ion battery packs for their power, and it just so happens that the liquid swimming around inside most lithium ion batteries is highly flammable.
If the battery short-circuits — say, by puncturing the incredibly thin sheet of plastic separating the positive and negative sides of the battery — the puncture point becomes the path of least resistance for electricity to flow.
It heats up the (flammable!) liquid electrolyte at that spot. And if the liquid heats up quickly enough, the battery can explode.
No brand or model is necessarily safe: for instance, unlucky iPhone owners allegedly suffered nasty burns from exploding devices in 2015 and 2016. And though the Galaxy Note 7 is making headlines right now, other Samsung phones have also burst into flames, like the Galaxy Core thatallegedly burned a 6-year-old child earlier this week.
We’ve known for years that lithium ion batteries pose a risk, but the electronics industry continues to use the flammable formula because the batteries are so much smaller and lighter than less-destructive chemistries. Lithium ion batteries pack a punch, for better or for worse.
Why Note 7?
What makes the Note 7 different: Samsung may have accidentally squeezed its batteries harder than it should.
According to a unpublished preliminary report sent to Korea’s Agency for Technology and Standards (obtained by Bloomberg), Samsung had a manufacturing error that “placed pressure on plates contained within battery cells,” which “brought negative and positive poles into contact.”
“The defect was revealed when several contributing factors happened simultaneously, which included sub-optimized assembly process that created variations of tension and exposed electrodes due to insufficient insulation tape,” a Samsung representative stated.
Or, in plain English: the thin plastic layer that separates the positive and negative sides of the battery got punctured, became the shortest route for electricity to zap across the battery (that’s why they call it a “short-circuit”), and became a huge fire risk.
What does pressure have to do with it? MIT materials chemistry Professor Don Sadoway explains that today’s cell phone batteries are made by literally pressing together a stack of battery components — and that battery companies are under pressure (no pun intended) to cram in as much battery capacity as possible.
Why didn’t the phones catch fire immediately?
When Sadoway explains these theories, one thing doesn’t seem to add up. Today’s cell phone batteries generally charge faster (and get hotter) when they’re first plugged into the wall, not at the end when they’re trickle-charging the last few percent to reach their maximum capacity.
But these Note 7 phones didn’t explode right away. In practically every reported instance of a Note 7 catching fire or exploding, it happened after the phone was plugged in and left charging, sometimes overnight.
Then, there’s the little matter of how Samsung plans to make these phones safer — by issuing a firmware update that keeps the Galaxy Note 7 from charging to more than 60 percent of its full capacity. How could that possibly help, if things heat up the moment a phone is plugged into the wall?
Sadoway has a theory — albeit one without proof. What if only part of the battery was squished improperly, so that the phone couldn’t tell when it was 100 percent charged, and kept on charging the cell?
When lithium ion batteries are continually trickle charged, the lithium ions can start to cover the surface of the negative contact in a coating of lithium metal through a process called “plating.” And in extreme conditions, that lithium metal can form tiny spikes (called “dendrites”) that can poke right through the separator, creating — you guessed it — a short circuit.
That would seem to line up with the “variations in tension” Samsung says it found inside the defective battery cells.
“My guess is by backing off to 60 percent charge, they’ll be well below the threshold where these things happen,” says Sadoway. “Imagine we’re trying to fill our gas tank, we don’t have a really good regulator, and we don’t want to spill the gas all over our shoes. We want to make sure we’re cutting off the flow well before this thing gets to overflow conditions.”
Samsung didn’t respond when asked for comment on the theory.
clearly these posed a great threat to the people and surely samsung has taken a good step by recalling the phones back.
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