> place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts.
Honest question: is this a real hack that people do in these situations or did you just come up with it?
Honest question: is this a real hack that people do in these situations or did you just come up with it?
In any case, dry sand is one of the methods firefighters use to put out battery fires, the other being dumping it in a giant vat of water (that's what's done for electric cars) or class D fire extinguishers which are extremely fine powdered salt.
Please only use properly designed and tested fire suppression systems, as hack jobs might not help at all and do harm from the false sense of security leading to lack of actually effective mitigations.
Shoddy knockoffs and cheap Chinesium garbage however, that's a different thing.
The odds get much worse when you have tens or hundreds of kWh comprised of hundreds or thousands of cells, especially in OPs jank setup with improper battery management and cells that are all already at the end of their life and likely have significant internal damage already.