Electronics > Projects, Designs, and Technical Stuff
Deliberate Lithium cell overcharging
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beanflying:
Section four in this PDF is fairly comprehensive http://hahana.soest.hawaii.edu/seagliders/manuals/electrochem_Battery_Safety.pdf An expanded version of this sort of treatment is where I was heading with my previous post. It will make sense if the pack is cool to remove any good and apparently undamaged cells ASAP just in case it goes to poo again.

The early remedy for R/C packs was to immerse them in a bucket of heavilly salted water then later pierce the foil bags of the pack :o This sort of option https://oscarliang.com/dispose-lipo-battery-safely/ Generally if the cells are temperature stable these days the plan is to fully discharge them and dispose appropriately in battery recycling options.

Dumping the heat still remains key to getting it under control initially and avoiding combustion if possible.
Siwastaja:

--- Quote from: beanflying on May 13, 2019, 07:35:28 am ---Section four in this PDF is fairly comprehensive http://hahana.soest.hawaii.edu/seagliders/manuals/electrochem_Battery_Safety.pdf

--- End quote ---

Do note that they don't manufacture lithium ion cells, and while a lot of advice in this document is generic and usable, some specifics could be misleading (for example, instructions regarding lithium metal cells).
beanflying:
True about it being general, it was just a file I found that had a decent procedural method laid out and it is the sort of approach you need to take post impact or electrical event.

Give it a few more years of exploding Teslas it will be much better known how to manage and prevent large packs going up in smoke and if they do what to do and then what to do to clean up after.
stj:
i can imagine 18650's going bang pretty easily,
once they get hot enough the insulating washer at the top could melt/get bypassed causing a dead short - then the pressure has to overcome some pretty thick metal.

as for tesla etc,
put the packs on runners with electrically fired gas-rams on them like on some seatbelts/roll-bars.
if the pack gets too hot - eject the warp-core(pack) onto the road!!  >:D
james_s:
Tasked with that I would use an aluminum partition. Aluminum is practically transparent to X-rays, especially at higher energies.
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