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Post by ianali on Jan 16, 2021 20:29:48 GMT
From a car forum. Any thoughts people?  |
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Post by Telemachus on Jan 16, 2021 21:13:23 GMT
One should bear in mind that there are many flavours of lithium battery. In the case you mention, it is LiPo. That is lithium polymer. Not to be confused with LiFePO4 where the P and O stands for phosphorous and oxygen, not polymer. LiPo is much more flammable, due to it releasing enough oxygen to sustain burning even under water. We don’t have LiPo, we have LiFePO4 which is pretty much as safe as lead acid.
Oh and equally confusing is the difference between lithium ion and lithium iron.
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Post by JohnV on Jan 16, 2021 21:18:05 GMT
Yup !!!
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Post by Deleted on Jan 17, 2021 6:17:25 GMT
I had a thermal runaway on a Lipo jump starter recently. Did a thread about it on here.
If you try and charge a 3S (3 in series ie 12.8v fully charged) Lipo battery from a normal alternator it will raise the voltage too high causing failure which starts with the pack expanding like a balloon, pushing out foul smoke for a little while then ends in a very large flame.
The original leads had a diode pack to block back charging but I had made my own leads due to losing the original ones.
I wonder if the same story happened in the OP.
The key question is what it a 3S or a 4S battery.
A 3S will be destroyed but a 4S won't be as the fully charged voltage for a 4S is 16.8v.
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Post by ianali on Jan 17, 2021 20:30:58 GMT
I had a thermal runaway on a Lipo jump starter recently. Did a thread about it on here. If you try and charge a 3S (3 in series ie 12.8v fully charged) Lipo battery from a normal alternator it will raise the voltage too high causing failure which starts with the pack expanding like a balloon, pushing out foul smoke for a little while then ends in a very large flame. The original leads had a diode pack to block back charging but I had made my own leads due to losing the original ones. I wonder if the same story happened in the OP. The key question is what it a 3S or a 4S battery. A 3S will be destroyed but a 4S won't be as the fully charged voltage for a 4S is 16.8v. No idea. I’d guess 4s as that seems the choice in this new car world I’ve entered. It’s a weight reduction thing, which I do understand. Then again, it’s surprising how many car fires occur in this new world I’ve entered. Scariest thing is that there’s a member on the forum with the name of DHutch.... and yes it’s that DHutch. Who’d have guessed. Has a lovely car mind. |
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Post by JohnV on Jan 18, 2021 8:09:11 GMT
Lead acids can also explode suddenly and with no warning.
I had just parked (at a boat jumble as it happens) and we were walking away from the car when suddenly there was a loud "Thump" and a cloud of steam/smoke poured out from the car bonnet.
Th RAC duly turned up and washed down the engine compartment with a mixture of water and bi-carb, fitted a new battery and checked the alternator output (well within limits)
When I questioned him about it he startled me by saying that that it wasn't that uncommon and he would come across something like that maybe 3 or 4 times a year
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