General > General Technical Chat
Don't keep fully charged Li-Ion in long term storage, they tend to bulge
<< < (14/18) > >>
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.

--- End quote ---

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.

--- End quote ---

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.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod