elkooo
Member
- Joined
- Aug 9, 2019
- Messages
- 32
So this is something that generally is not admitted with pleasure:
I had a battery fire. It was probably caused by a spot welded nickel strip, that worked its way through the shrink wrap on the positive end of a cell (where the edge is already negative...). It was a 10s5p arrangement, housed in an aluminum case.
Luckily I was able to bring the battery outside at first signs of smoke. If the fire happened inside, I would probbably not have a home anymore.
The cause was most probbably due to the nickel strip that cut its way through the shrink wrap. On this battery, the cells were stapled on top of each other and the nickel was bent 180 from one 5p pack to the next one. The bend was sitting in the area, where the outer rim of the cell is already negative right under the shrink wrap(on the + side)... and due to mechanical movement / load it probbably worked its way through the plastic and caused a short. Because the heat was caught in the thight aluminum case, something caught fire (either the plastic or any gases exiting the cells) and the whole pack burnt out in a raging fire.
I post thisa warning for everyone having cells at home. Shorted cells can easily cause harm and fire. I expirienced it myself now and think it was a fair warning (no other damage than the lost pack was caused...). So please be careful!
I had a battery fire. It was probably caused by a spot welded nickel strip, that worked its way through the shrink wrap on the positive end of a cell (where the edge is already negative...). It was a 10s5p arrangement, housed in an aluminum case.
- The fire burnt so hot, that it went through the aluminum pack enclosure(~1.5mm wall thickness)in less than 2mins.
- From the first visible smoke to first flames was around 40secs (reaction time)
- All cells burnt out through the tight arrangement in the aluminum casing.
- The flames shot out though the end caps on both sides of the caseand reached around 1.2m in flame lenght (!).
- The fire burnt full powerfor around 2mins and calmed down then.
- By this time, the remnants of the cells werered glowing inside the damaged aluminum enclosure.
Luckily I was able to bring the battery outside at first signs of smoke. If the fire happened inside, I would probbably not have a home anymore.
The cause was most probbably due to the nickel strip that cut its way through the shrink wrap. On this battery, the cells were stapled on top of each other and the nickel was bent 180 from one 5p pack to the next one. The bend was sitting in the area, where the outer rim of the cell is already negative right under the shrink wrap(on the + side)... and due to mechanical movement / load it probbably worked its way through the plastic and caused a short. Because the heat was caught in the thight aluminum case, something caught fire (either the plastic or any gases exiting the cells) and the whole pack burnt out in a raging fire.
I post thisa warning for everyone having cells at home. Shorted cells can easily cause harm and fire. I expirienced it myself now and think it was a fair warning (no other damage than the lost pack was caused...). So please be careful!