How and Why the Note 7 catches Fire!

[Preach2k]

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[FoxKat]

Well this video does show what happens when a lipo battery is deliberately damaged, but it doesn't show what is causing the Samsung phones to catch fire.

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[Preach2k]

Well this video does show what happens when a lipo battery is deliberately damaged, but it doesn't show what is causing the Samsung phones to catch fire.

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I think it does. The cause of the Note 7's problem has been cause by the battery. All of the pictures that have been shown, shows the fire started at the battery. Not in other areas. Since samsung had 2 factories creating their batteries and found out one of the companies had an bad batch of batteries.

Reports from inside the Korean industry now suggest that the company will be completely dropping batteries produced by its Samsung SDI subsidiary from use in the Note 7.

Samsung SDI supplied 70 percent of the batteries fitted into the 2.5 million estimated Galaxy Note 7 units that have so far landed in consumer hands and stores. The other 30 percent of batteries have been provided by Chinese battery maker ATL. It is now likely that Samsung will have to purchase additional batteries from ATL for its recall and future Note 7 stock. It’s also possible that Samsung may use batteries from familiar supplier LG Chem to make up any shortfall.

“For the global recall of 2.5 million units, Samsung SDI is expected to bear the expense for most of the battery parts,” – Lee Seung-hyuck, analyst at Korea Investment & Securities

According to Samsung, problems with defective batteries are the leading cause of reported Note 7 explosions and fires. We now know that Samsung itself is responsible for the development and manufacture of these faulty cells. Samsung SDI only began development of non-removable batteries at the end of 2014, as part of an effort to bring more components in-house to improve profit margins. The company didn’t supply many batteries for use in the Galaxy S6 or S7 series, the Note 7 is the first phone to have purchased the majority of its cells from Samsung SDI.

Galaxy Note 7 drops Samsung SDI batteries after fires

 

[FoxKat]

Well yes, the battery may be at the root of the problem for these phones as they've indicated, however ANY LiPo battery will catch fire if poked or ripped open like that. Lithium is a volatile metal and by it's very nature is dangerous.

Like all very alkaline metals, Lithium is highly reacting and flammable. In its raw form it's stored in oil prevent it from reacting with Oxygen in air and bursting into flames. By puncturing them or unwrapping them as in the video, you're essentially exposing the Lithium to Oxygen and starting the reaction which is then self-sufficient and will continue to burn until all Lithium has been oxidized. If contained in a small space it will reach extremely high temperatures and can be explosive if contained under pressure.

These LiPo batteries are really being used within a very narrow "safe zone" of operation and both the discharge and charge rates, along with internal temperatures have to be monitored very closely in order to prevent them from self-destructing.

There are very complicated circuitry systems and algorithms incorporated into the phones and also inside the batteries themselves in order to keep them operating safely as possible. The charging adapters are NOT intelligent most cases (except for the new Rapid Charging adapters), and instead simply supply the stepped down and regulated DC voltages necessary to activate the charging circuitry. It's the phone and battery that do all the charging and monitoring to make sure the batteries remain safe. Just one flaw in any of these safeguards can result in these batteries becoming incendiary devices. This is most often the cause self-destructing (thermal runaway).

If the circuit on the board internal to the phone fails, the one in the battery is supposed to protect itself. If however the failure of the phone charging board is such that it's damaging the battery's protection board then the battery will suffer extreme charging and this will result in it burning up.

So what I'm saying is the video itself doesn't prove their batteries are any more dangerous than others when used normally.

Ref: Lithium - Wikipedia, the free encyclopedia

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[mountainbikermark]

Well yes, the battery may be at the root of the problem for these phones as they've indicated, however ANY LiPo battery will catch fire if poked or ripped open like that. Lithium is a volatile metal and by it's very nature is dangerous.

Like all very alkaline metals, Lithium is highly reacting and flammable. In its raw form it's stored in oil prevent it from reacting with Oxygen in air and bursting into flames. By puncturing them or unwrapping them as in the video, you're essentially exposing the Lithium to Oxygen and starting the reaction which is then self-sufficient and will continue to burn until all Lithium has been oxidized. If contained in a small space it will reach extremely high temperatures and can be explosive if contained under pressure.

These LiPo batteries are really being used within a very narrow "safe zone" of operation and both the discharge and charge rates, along with internal temperatures have to be monitored very closely in order to prevent them from self-destructing.

There are very complicated circuitry systems and algorithms incorporated into the phones and also inside the batteries themselves in order to keep them operating safely as possible. The charging adapters are NOT intelligent most cases (except for the new Rapid Charging adapters), and instead simply supply the stepped down and regulated DC voltages necessary to activate the charging circuitry. It's the phone and battery that do all the charging and monitoring to make sure the batteries remain safe. Just one flaw in any of these safeguards can result in these batteries becoming incendiary devices. This is most often the cause self-destructing (thermal runaway).

If the circuit on the board internal to the phone fails, the one in the battery is supposed to protect itself. If however the failure of the phone charging board is such that it's damaging the battery's protection board then the battery will suffer extreme charging and this will result in it burning up.

So what I'm saying is the video itself doesn't prove their batteries are any more dangerous than others when used normally.

Ref: Lithium - Wikipedia, the free encyclopedia

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This is more prevalent in the vaping world if you do a Google search for exploding batteries. Again, usually wraps are the ultimate culprit as many will just toss an 18350 around like its a dead Duracell .

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