General > General Technical Chat
Don't keep fully charged Li-Ion in long term storage, they tend to bulge
RoGeorge:
How did you ignite it?
SiliconWizard:
--- Quote from: james_s on January 18, 2023, 09:22:23 pm ---
--- Quote from: SiliconWizard on January 18, 2023, 09:17:00 pm ---
--- Quote from: tooki on January 18, 2023, 07:05:39 pm ---
--- Quote from: RoGeorge on January 18, 2023, 09:50:56 am ---As for the other Li-Ion batteries leftovers from mobile phones, if I will ever reuse them, will let them bulged as they are. No need to deflate since the DIY enclosures can be made big enough.
--- End quote ---
Are you insane?!?
--- End quote ---
He got warned enough, I think. Now he mentioned a pretty low-capacity battery, so the risk was minimal in terms of fire. The nasty chemicals, OTOH, is something else.
--- Quote from: tooki on January 18, 2023, 07:05:39 pm ---A swollen lipo pouch belongs in exactly one place: the recycling bin. Continuing to use it is asking for trouble.
--- End quote ---
Yes, but not in the general trash bin, please. This is dangerous and illegal in most places. Dispose of it in appropriate bins.
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It's always been accepted practice in the USA to discharge pouch cells and throw them in the regular trash, I'm not aware of any regulations against doing that.
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Certainly not in the EU, at least! There is always this crossed waste bin symbol to make it clear.
https://www.compliancegate.com/lithium-battery-safety-standards-european-union/
james_s:
--- Quote from: RoGeorge on January 18, 2023, 09:28:23 pm ---How did you ignite it?
--- End quote ---
Connected to a bench PSU and overcharge it, they self ignite.
RoGeorge:
What current voltage did it caught fire?
Was that with or without the small Battery Management System PCB on top of the battery?
The mobile phone cells always come with a small BMS inside. I know for sure the BMS will disconnect the battery at lower than 2.8V (it happened with a few batteries while I was discharging them to measure their capacity).
The internal BMS is also supposed to disconnect the cell at more than 4.3V charging, or at a short circuit (high current, don't know which I value). So far never tested the overvoltage and the overcurrent limits.
amyk:
--- Quote from: JDubU on January 18, 2023, 12:34:36 am ---RoGeorge:
Do not puncture a lithium ion battery pouch under any circumstances!!! :palm:
The liquid electrolyte is a lithium fluoride compound that will convert to hydrofluoric acid in the presence of moisture. Hydrofluoric acid is a very dangerous contact poison.
It also stops being a battery if any moisture is present in the electrolyte.
--- End quote ---
You'll get HF if the battery burns (due to fluoropolymers being used in the separator), but the electrolyte itself is relatively tame.
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