Fireproof 18650 Insulation Rings?
- Thread starter rg12
- Start date
goatman
10 MW
were you using an open flame? corn chips catch fire easy also if you put a match to them but you can put them in the oven at 350. what temperature do they start to combust at with no flame? and will the battery get that hot? and will the battery be exposed to flame?
If the pack is shorted and overheating enough to cause a cell fire, you could make the rings out of bbq-grill starter material and they'd still be contributing so little to the energy of the fire compared to the burning and exploding cells that you probably wouldn't even notice. 
If you want "fireproof" stuff, buy nomex and make your own with a cutting die. About as close as you're going to get.
If you want "fireproof" stuff, buy nomex and make your own with a cutting die. About as close as you're going to get.
Punx0r said:
I see, so if a cell goes bad making the nickel touching the ring to go super hot for some reason after a failure, then how much heat can it tolerate? it's just paper after all, there is a reason why we use kapton and not regular tape...
dogman dan
1 PW
Agree with some of the others, if the cell overheats enough to burn that cardboard, you are already hearing what I heard as my garage burned. Pop pop pop, like somebody had set fire to a box of ammo in my garage.
But as my battery overheated while charging, its quite possible that cardboard tubes might have prevented the shorts that must have happened as the battery burned. That might have bought me time to heave the thing out the door had I been awake. It might have stunk a while, got noticed, rather than just going off like a 5 gallon can of gas on fire in the room.
But as my battery overheated while charging, its quite possible that cardboard tubes might have prevented the shorts that must have happened as the battery burned. That might have bought me time to heave the thing out the door had I been awake. It might have stunk a while, got noticed, rather than just going off like a 5 gallon can of gas on fire in the room.
rg12 said:
The ring is mostly to prevent shorts where something wears through the insulation on the top of the cell (nickel strip, balance wire, battery casing etc). It will also give you some protection against an over-heating nickel strip, but hopefully you'll manage to design against that happening. A fire proof ring (maybe some kind of fibreglass) would theoretically be better, but I don't think anyone goes to this length.
