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DIY firesafe casing - Test
#11
drbacke, well done. I'm planning a similar design for my box, but a few more boxes. I'm pleased to see that your material hold up rather easy. I am planning to use fiber cement board, and my concern was that a possible explosion could break the box and leak to the next. All in all, with big vents, it seems like the chance for a group pressurized explosion to break the box is rather low. Possible not impossible, but low. I'm also investigating some silicone to join the array of boxes, which is fire proof. Also, the nice bit it that if all that goes bad, does not go bad for too long, you would not have a fire for a long duration. Now there is still the plastic burning for a period of time, and plastic, can burn for some time. I'm planning in using HDPE for the holders.

Nice work.
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#12
(05-08-2019, 11:07 AM)Regalo Wrote: drbacke, well done. I'm planning a similar design for my box, but a few more boxes. I'm pleased to see that your material hold up rather easy. I am planning to use fiber cement board, and my concern was that a possible explosion could break the box and leak to the next. All in all, with big vents, it seems like the chance for a group pressurized explosion to break the box is rather low. Possible not impossible, but low. I'm also investigating some silicone to join the array of boxes, which is fire proof. Also, the nice bit it that if all that goes bad, does not go bad for too long, you would not have a fire for a long duration. Now there is still the plastic burning for a period of time, and plastic, can burn for some time. I'm planning in using HDPE for the holders.

Nice work.

This sounds like a very interesting project, which kind of battery do you plan to use?
In my experience the "explosion" of genuine 18650 is not really powerfull and in most cases there is no explosion. Maybe generic "china" cells are more dangerous if the overpressure valve is not designed well. Also the cells doesn't burn at once, the spread is a slow but insidious process

If it will all burn: No one can tell you what happens. But with a well designed casing, you'll have a greater chance of a safe course.
Of course the important thing is not to let it get that far.
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#13
Nice test. I was also thinking of using drywall pieces between cell groups. There's fire-resistance drywall as well, it's got a pink wrapper, instead of the green seen on your video. Green ones are for humid places, actually. I have an important question, though: What kind of cells were you using? Were they end-of-life cells? I believe everything would be much more violent if you were to use new, high-capacity, fully-charged cells.
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#14
Please dont use hdpe, if that burns, it will be very hard to put out.
It smokes like rubber.
Still learning English. Learning Li ion and solar technology.
+/- 3500 Li ion cells harvested, none checked and counting.

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#15
(05-11-2019, 06:21 PM)100kwh-hunter Wrote: HDPE.....DONT USE....FREAKING DON'T USE

DON'T YOU DARE

Please elaborate as to why. Other than "It's plastic"
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

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#16
DrBacke, I'll be using the 18650's. Bit busy going through them. What a tedious winter job.

100Kw, the burning plastic is a concern, yes. I'll burn a piece, and see if I can find less burnable plastics, but as Korishan suggests, I think my luck will be out.
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#17
Quick thought:
I think a plastic named pp or pe will suit your needs, i thought it only melted by very hot temps and its difficult to make it burn.

I am planning to make for every pack a brick "room" like a wasp nest, or with vermiculite board.
Vermiculite board is just like wood to work with.
I am going to use some drywall sheet, for every cell there will be a hole on both side's with i put a cap in it.
The goal i would like to achieve is, if one cell goes bad, the sparkles wont go/reach to the rest of the pack and only pops the cap.
That li ion gas, is like a firecracker broke in half when it ignites, a very hot greenish blueish color, might burn hotter than a acetylene gas torch
When a cell ignites it will burn for a ~10-15 seconds, i think this is enough time to set dry wood on fire.

So packs are fire insulated from each other and if a cell goes bad the flame won't reach other cells.
Its costing enough time and money already, so this extra mile is a small step
Did you ever thought about epoxy resin to combine? It will extend the fireproof time long enough.

Those were my little thoughts
Thanks for sharing, best
Still learning English. Learning Li ion and solar technology.
+/- 3500 Li ion cells harvested, none checked and counting.

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#18
Daromer did some very interesting experiments, it is a good guide line for me to protect the other cells for if one goes awol.
When i am ready to make some protection, i will share some pictures of course.

Best
Still learning English. Learning Li ion and solar technology.
+/- 3500 Li ion cells harvested, none checked and counting.

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#19
Has anyone thought about the flame retardant coatings that are available?  There are coatings rated Class A.  An intumescent paint is actually supposed to create a foam fire retardant when heated to a certain temperature.  Certainly might be of interest for at least a battery that is made to be portable in some way .... or maybe even a solution to what this whole thread is about if the net result of any material is to slow the fire down.  Here is Youtube video on one manufacturer's paint ...I think the later segment at around 2:29 is the more relative to our concerns about containing a battery fire.

https://www.youtube.com/watch?v=lVWVP3tKlZc
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#20
Someone built their packs in PC cases (eg cheap steel boxes)
Maybe these could be lined with cement board.
Regular drywall might not be so good as surfaces are only thick paper (burns) & centre only chalk (physically weak)?
Running off solar, DIY & electronics fan :-)
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