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-   -   Lipo exploding (http://www.Wattflyer.com/forums/showthread.php?t=73423)

tonywayne 03-25-2014 07:30 AM

Lipo exploding
 
Just shows how tough lipos are, but how violent they can be!

https://www.youtube.com/watch?v=WrbP3AMMsbM

sidybee 03-25-2014 04:35 PM

weenier roast time.... ummm marshmallows

hayofstacks 03-26-2014 02:44 AM

Throw a cup full of gas/nitro in a fire, then tell me which creates more of a fire hazard.

Even though they burn hot, its usually, short, and pretty well contained. a ceramic bowl is plenty to keep you safe from most batteries

Rodneh 03-26-2014 04:24 PM

The title is somewhat misleading; LiPo's do not explode, they burn. Quite a difference between an explosion and a fire.

Larry3215 03-26-2014 04:27 PM

Quote:

Originally Posted by hayofstacks (Post 943634)
Throw a cup full of gas/nitro in a fire, then tell me which creates more of a fire hazard.

Even though they burn hot, its usually, short, and pretty well contained. a ceramic bowl is plenty to keep you safe from most batteries

Not really.

When a lipo catches fire and starts venting it, spits out burning pieces of itself that can travel quite a long ways and set fire to things on the far side of a typical work room very easily.

I had a lipo fire in my work shop several years ago. The lipo was in one corner of the shop sitting on my bench when it went off. I found holes burned all the way through models, cloths, carpet, and cardboard boxes that were on the far side of the room. In fact, there were burn marks on almost every single exposed surface in the entire room.

You must use an enclosed container that will contain those flying sparks or you are not protected from secondary fires.

The only reason I didnt loose the entire house was the fact I was right there and managed fast action with a large fire extinguisher. There was still almost $15,000 in damages to the room and contents -0 including 7 models ruined.

Larry3215 03-26-2014 04:43 PM

3 Attachment(s)
Just to illustrate how poorly an open container will work - here are some pics from my fire. The lipo pack was being charged in one of those metal document safes - but the lid was open.

thepiper92 03-26-2014 05:20 PM

Yikes, lot of damage. That depron looks like the plastic used for folding table, with the little specks in it.

kenchiroalpha 03-26-2014 05:46 PM

Hi
To be on the safe side I use these while charging and storing
http://liposack.com
Also I never leave them unattended while charging always be present while doing so
Take care
Yours Hank

Larry3215 03-26-2014 07:09 PM

LipoSacks are one of the best/easiest ways to protect your home and family.

I would recommend putting the liposack on a non-flammable surface. The sack will get extremely hot when a lipo goes off. Hot enough to start secondary fires if its sitting on a wood shelf or near papers, carpet, etc.

I now put my liposack inside my metal document safe when charging - with the lid still open.

DO NOT try to enclose a lipo in a tight fitting case when charging. The huge volume of gasses released can explode the container. I have seen videos of ammo cans burst open when a lipo went off.

CHELLIE 03-26-2014 08:55 PM

Quote:

Originally Posted by Larry3215 (Post 943691)
LipoSacks are one of the best/easiest ways to protect your home and family.

I would recommend putting the liposack on a non-flammable surface. The sack will get extremely hot when a lipo goes off. Hot enough to start secondary fires if its sitting on a wood shelf or near papers, carpet, etc.

I now put my liposack inside my metal document safe when charging - with the lid still open.

DO NOT try to enclose a lipo in a tight fitting case when charging. The huge volume of gasses released can explode the container. I have seen videos of ammo cans burst open when a lipo went off.

I agree with you Larry, Ceramic flower pots are good to use, Only if you put a Ceramic floor tile on top of them, Ammo cans are good to use, Only if you vent them to allow the pressure to Escape so it does not blow up, Lipo sacks are great to use too. A Person really has to be careful using Lipos and Think Safety all the Time. Take care, Chellie


http://www.Wattflyer.com/forums/atta...4&d=1395821855

FlyWheel 03-27-2014 01:47 AM

I use a ceramic pot; battery cord out through the drain hole in the bottom and connected to the charger outside, top open so if it does go up it can burn itself out safely. Vigorous burning + closed container = bad. :concern:

ramboman 03-28-2014 06:13 PM

THE alternative
 
Since years I am using a123... NO risk at all !

kenchiroalpha 03-28-2014 08:37 PM

Quote:

Originally Posted by ramboman (Post 943858)
Since years I am using a123... NO risk at all !

Hi
Even those are not risk free aand you should take precautionary measures during the charging process imho
http://www.greencarreports.com/news/...rom-a123-cells
Take care
Yours Hank

kyleservicetech 03-29-2014 12:50 AM

Quote:

Originally Posted by Larry3215 (Post 943682)
Just to illustrate how poorly an open container will work - here are some pics from my fire. The lipo pack was being charged in one of those metal document safes - but the lid was open.

Hey, finally found someone whose workbench has as much crap on it as mine :oops:

One of my club members' workbench, and entire workshop for that matter is so clean you could eat off of it.

Having seen several LiPo fires, one of which was a 12S 5000 Mah pack after a straight in crash, I'd never want one to go off anywhere near my home.

kyleservicetech 03-29-2014 01:02 AM

Quote:

Originally Posted by kenchiroalpha (Post 943872)
Hi
Even those are not risk free aand you should take precautionary measures during the charging process imho
http://www.greencarreports.com/news/...rom-a123-cells
Take care
Yours Hank

Just a note.

The report indicates that a Lithium Ion battery failed, not the Lithium Nano-phosphate chemistry used in an A123 or similar LiFe chemistry.

Lithium Ion cells are charged to 4.2 Volts DC, versus a maximum of 3.6 Volts DC for the A123's.

There is a video where they subject an 2300 Mah A123 cell to a nail puncture, running a nail clear through the cell. Lots of smoke, but zero fire.

And, lastly, I did my own :censor: test on a pair of A123's several years ago, charging them at 3 Amps, to 14 Volts on two cells. The cells blew apart, made a lot of carbon dust all over the place. But zero fire, zero damage to anything nearby.

kyleservicetech 03-29-2014 01:03 AM

Quote:

Originally Posted by ramboman (Post 943858)
Since years I am using a123... NO risk at all !


Yup
I've got over 100 of these A123 cells in a variety of models. Zero problems. In fact, those A123 packs are permanently installed in their respective model airplanes.

ramboman 03-29-2014 07:06 AM

Quote:

Originally Posted by kyleservicetech (Post 943888)
Yup
I've got over 100 of these A123 cells in a variety of models. Zero problems. In fact, those A123 packs are permanently installed in their respective model airplanes.

I do the same, using SPS to disconnect when charging, a dream ;)

FlyWheel 03-29-2014 02:46 PM

Quote:

Originally Posted by kyleservicetech (Post 943886)
Hey, finally found someone whose workbench has as much crap on it as mine :oops:

<snip!>

That's because you've never seen mine! :oops:

hayofstacks 03-29-2014 08:11 PM

The 3 cells I've seen go off are more of a smoke show then anything. I'm not saying lipos are always safe, but out of abbout 50 I've only had one fail.

i charge my batteries in a concrete block.

tr4252 03-29-2014 11:19 PM

Quote:

Originally Posted by hayofstacks (Post 943956)

i charge my batteries in a concrete block.

I think that's a pretty good method.

I had a bunch of refractory bricks left over from a heat treating oven project, and store mine in a sort of vault I made by stacking them. They should contain solid bits of flaming battery, but allow smoke and pressure to escape.

It's the smoke that bothers me as well, though. Right now my model stuff is in a room with old guitars, a few antique guns, and a nice stereo, among other valuables. I wonder if the smoke can do any damage.

Thinking of finding a way to vent the container to the outside.

Tom


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