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Originally Posted by WarrenC12
Yeah, this is a big talking point. Fortunately they don't turn into bombs like propane or natural gas vehicles.
Bottom line is that all types of vehicles have caught on fire, and while batteries burn differently, there's nothing to suggest they are much worse than any other vehicle fire.
If they caused more fatalities per incident, we'd have heard about it non stop for a decade now.
Lithium batteries are literally everywhere in modern society. We seem to be doing ok.
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Actually, they are much worse once they catch on fire (which is why I posted it).
There's lots of info out there, and I often find the info intended for firefighters to be the most informative.
Here's just one article, but there are many:
https://www.firerescue1.com/electric...4UedqIpVqc1k2/
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A high-voltage battery is made up of many cells packed tightly together inside a watertight, fire-resistant box. When a single cell fails, it is essentially a small explosive that produces a tremendous amount of gas and heat (1,200 degrees F) in tenths of a second. The failure is an exothermic chemical reaction that does not require oxygen from the atmosphere to sustain itself. The heat released from each individual cell is transferred to the neighboring cells, which causes them to fail as well.
Once a battery cell fails, it is impossible to extinguish the failed cell as the chemical reaction inside the cell happens far too quickly. The only way to stop a thermal runaway is by directly cooling the cells involved to ensure that the failed cell does not cause the cells around it to also fail.
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The article then explains some firefighting techniques that have been tried but don't work well, at all, or cause other dangers.
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The truth of the matter is there is no simple solution or tool to stop a thermal runaway in an EV’s high-voltage battery. Directly cooling the battery cells is the best method, however the manufacturers do not give first responders direct access to the inside of the battery box. Trying to cool the battery cells from the outside will only extend a crew’s time on scene.
If the battery box is intact and there are no exposures, the best solution is to simply wait for the battery to burn itself out, then extinguish the remaining class A fire.
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I've read other recommendations whereby after the fire has been extinguished, the vehicle has to be left outside in a lot without anything else around for a period of time because it can ignite on its own again. Not ideal, to say the least.
That said, companies are working on the thermal runaway problem, and I'm sure it will be solved at some point. It just hasn't been yet, so I don't see any need to gloss over it. New technologies take time to perfect, which is one reason why I don't tend to be an early adopter.