All right, so we get batteries here all the time and i have to take them apart and see how they're put together what's inside what they can be used for all kinds of stuff right. But while i'm taking one of these things apart, look at what i find here. This is a well. This is kind of like a trap.
There's a fan in here right, so in order to get the the batteries ventilated, but you see the strap here. It almost lets the air go through, but maybe the flames don't go through for some reason they felt the need to put this trap in here. You know it's like a kind of thing and then there's another version that has one of these, and this is very interesting because it's got double uh perforated material, so they don't match exactly they're a little bit off. You know there's an offset very interesting uh.
What do you guys think about this? What are they for.
The second component is a classic flame arrestor….
I am not an expert, just someone who can google and has looked into these things in the past. I might be talking nonsense. But I would agree that those are both used as a "flame-front break" or a "Flame arrestor" which basically means it stops the 'fire' in whatever manner you can. The convoluted path method just makes the air turbulent, which breaks up the flame front and stops it from accelerating TOO much… And the other mesh square version basically cools the flame front so much that it can no longer continue combustion, while also breaking the front into very tiny flames.
My guess is that its to catch most of the dust without a filter you need to service. Somewhat like centrifugal filtering, but much simpler.
Maybe it protects the Battery from something on the outside. Or it is made so the pack can made the explosion proof certification.
Probably fire shielding but maybe EMI too.
looks like a spark or flame "arrester"
I have seen air traps like this used to separate dust and particulate from air flows. The air will flow around but the other particles will struggle to make it around into the main battery chamber. Not perfect but better than nothing.
Probably for suppression if the batteries did go nuclear…the venting would help smother the reaction and limit O2 from getting in as fast.
I believe its to reduce the flames produced by a burning battery. It limits oxygen a bit and also greatly reduces the velocity of the flame coming out. Its alot easier to manage a 1ft fireball vs a 6ft one.
I have done similiar with an electric mountainboard battery. I encased it in .25 inch cement fiber board and loose fiberglass mat. In my small scale tests it was able to cut the flames down to almost nothing and it reduced the heat in the process. limiting the oxygen in prevented them from all exploding at once
Would be interesting to see how effective it is at actually ventilating the cells