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DIY firesafe casing - Test
#1
Hey guys,
as I mentioned in another Thread before, I did a test of my diy casing for the lithium packs.
I build a small version and ignited 6 and 12 Lithium Batteries inside the small casing.
It was a serious test, but I'd be lying if I said we didn't have fun. 
I hope you don't think I'm crazy now. But the test actually calmed me down a lot because I trust the case more.

Here is the result, I found it very promising:


Here is the big version of my box, the packs above the the lithium packs tiny hollow glas balls escpecially made for metal fire. They should fall down in case of heat and withdraw the termal energy for melting: 
Redpacket, oilskov, stevelectric like this post
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#2
Where did you get these glass balls?
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#3
From voltmaster.de, 9,5€ per pack.
Extover® - Brandschutz Feuerlöschgranulat für Lithium Akkus - Kissen - 5l
stevelectric likes this post
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#4
What are your "Brandschutzplatten" exactly ? "Gipskartonplatten" or someting special ?

I admit in the beginning i didnt recognize the value of the firetests you wanted to perform, but having seen this result i stand corrected:
Good work and really interesting result.

(All Germans in one thread ?)
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#5
Nope not all germans in this thread(-: also dutchies...

Clever findings, i was also planning to insulate with rockwool and "gipskartonplatten".(drywall sheets plaster)
Thanks for this info and video.

I trow some heaters in the fire outside and get a similar result, big flames even a bang or two.
Is it a idea to put some on a electric heating plate, those plates warm up to 460 degrees celsius max.

Thanks

What was the fire starter in you're first test btw, gunpowder or just match heads grinded up?
Still learning English. Learning Li ion and solar technology.

1400 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
2600 waiting for testing.
approx: 500 cells not safe for use: dead, heaters, to high ir or sd

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#6
@cherry67: Rigips multiboard 12,5mm
@100kwh: First we tried sparklers, 6 sparklers worked quite good. But the heat gun is much easier and more safe, because it takes some minutes to ignite the cells.
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#7
It looks like it takes a fair bit of energy to get cells to burn.
Even after cells burned, it took the heat gun to make more burn.

Do you have any idea what temperature the box was when the cells started to burn?
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#8
Theory says 130 degrees make the cells run away. The separator fails at that temp.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#9
I think there was a little bit more temperature in that "chamber" than 130

That's why i suggested and hoping for a test with a electric heating plate.
You can figure out the temp on those things.

Speaking frankly......I hope he will do the test, I was planning to do it but it will save me some time.

For a temp sensor for those kind of temps, look for furnas build(force, melting oven ect)....I have two...cant remember the name...german make btw.
You can order cheap sensors for temps between 800 and 2500 degrees celsius.
Or go to a lower temp and use a oven thermometer(max 400), or for lead casting stuff(400 to 900 degrees celsius)

My 2 cents.
Still learning English. Learning Li ion and solar technology.

1400 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
2600 waiting for testing.
approx: 500 cells not safe for use: dead, heaters, to high ir or sd

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
Reply
#10
(05-01-2019, 01:29 PM)Oz18650 Wrote: It looks like it takes a fair bit of energy to get cells to burn.
Even after cells burned, it took the heat gun to make more burn.

Do you have any idea what temperature the box was when the cells started to burn?

The first reactions came after a relatively short time (1-2min). Usually a "Plop" and then is the cell side wall burst or the overpressure valve. After that the cells only smoke until they run out. That the cells really burned, occurred only very rarely. 
In "Electrical safety of commercial Li-ion cells based on NMC and NCA technology compared to LFP technology - Brand et. al." is a more precise measurement of the termal runaway temperatures. But no cell in their tests exploded or burned. The CID or the overpressure valve prevented that very safely. 
But measuring the termal runaway temperature was not my goal, I just wanted to see, wether the casing material can stand the extreme temperatures or not.
And it was no problem at all for the material.
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