General > General Technical Chat

Out-of-control EV blaze (thermal runaway) threatens to sink massive RORO ship.

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nctnico:

--- Quote from: PlainName on September 03, 2023, 11:33:53 am ---
--- Quote ---nor how it stopped
--- End quote ---

Exothermic reaction ran out of therms.

--- End quote ---
But it is interesting to find out why the car they pulled out of the wreck started to smoke again. I can't think of any mechanism that makes something like that possible with an ICE car which is submerged in water. OTOH with an EV there is stored energy in the battery that doesn't need anything from the outside (like an oxidizer) to be released.

PlainName:
It started to smoke in the water (assuming that's what was in the trough - I am sure someone will say we can't discuss that without an official analysis). Maybe it was a bit hot when they pulled it out, but they sure didn't look too concerned until it was dumped in the trough. Since the battery would presumably form part of the chassis, I would have thought it would be reasonably waterproof. But perhaps there's a difference between water thrown up from the road and water pretending to be passengers.

Bud:
Which brings an interesting observation: plenty of videos out there on floodings where people drive their cars and trucks half submerged in water. I guess you should not try that with EVs.

gnuarm:

--- Quote from: Bud on September 03, 2023, 06:02:11 pm ---Which brings an interesting observation: plenty of videos out there on floodings where people drive their cars and trucks half submerged in water. I guess you should not try that with EVs.

--- End quote ---

Why?

tom66:

--- Quote from: Bud on September 03, 2023, 06:02:11 pm ---Which brings an interesting observation: plenty of videos out there on floodings where people drive their cars and trucks half submerged in water. I guess you should not try that with EVs.

--- End quote ---

If anything, an EV is better in water.  The risk is getting the water in the battery pack, but that would only happen if the vehicle was submersed for some time; the packs are sealed generally quite well.  There is no air intake or exhaust on an EV, so as long as the wheels are still on the road, it should be OK from an electrical perspective.

On Tesla packs, water eventually gets into the pack via the rebreathers which equalise pressure in the pack.  This only occurs when the water gets into the cabin, at which point other things are likely broken in the car.

Of course, cars are not boats, and people are notoriously bad at estimating depth.  In general, it's a bad idea to drive through any deep water unless you are absolutely certain of the depth.

https://youtu.be/watch?v=cBYFo6fXPvU

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