4 ms·

Interesting, but probably "of limited use to useless" long term, because batteries don't come apart nicely without, at a minimum, high risks of shorting them ou

by Syonyk 6y ago

Interesting, but probably "of limited use to useless" long term, because batteries don't come apart nicely without, at a minimum, high risks of shorting them out and thermal runaways. For the typical cylindrical cells, the "jelly roll" is squeezed in quite tightly (this reduces internal resistance by squeezing the bits tightly together and optimizes capacity per cell), and then the bits tend to swell a bit in use. This is one of the advantages of a cylindrical cell - those stresses turn into tension stresses around the circumference and the cell doesn't actually swell like prismatic cells. But getting the bits out, intact, without shorting something out? Good luck. https://doi.org/10.1002/cssc.202100629 https://doi.org/10.1002/cssc.202100629 is the link to the article, but I don't have access without paying. If anyone finds it, I'd love to read it to see what they've done, though!

giuliomagnifico 6y ago
I think this technique can applied only on batteries already made to be recycled in this way, but is a good pint for the future industries “By reusing the structures of batteries we can avoid a lot of the labour that is common in recycling and potentially save energy at the same time. We believe that the method could help companies that are developing industrial recycling,” Kallio says.
dehrmann 6y ago
> because batteries don't come apart nicely without, at a minimum, high risks of shorting them out and thermal runaways. Is there a way to speed up self-discharge? Or maybe manufacture batteries in a way such that they can be easily discharged over a ~day, bypassing any circuits limiting the maximum discharge? The way they're packaged sounds harder to mitigate, though.
- Syonyk 6y ago
  Short 'em through a resistor, it's easy enough to fully discharge them. You damage them if they're left discharged for too long, but for short periods, it might be fine. Unfortunately, they also tend to swell when fully discharged. "Disassembling lithium batteries without destroying them or your workshop" is depressingly hard.
zackees 6y ago
Likely works for larger EV type batteries though..?

by Syonyk 6y ago

giuliomagnifico 6y ago

I think this technique can applied only on batteries already made to be recycled in this way, but is a good pint for the future industries “By reusing the structures of batteries we can avoid a lot of the labour that is common in recycling and potentially save energy at the same time. We believe that the method could help companies that are developing industrial recycling,” Kallio says.

dehrmann 6y ago

> because batteries don't come apart nicely without, at a minimum, high risks of shorting them out and thermal runaways. Is there a way to speed up self-discharge? Or maybe manufacture batteries in a way such that they can be easily discharged over a ~day, bypassing any circuits limiting the maximum discharge? The way they're packaged sounds harder to mitigate, though.

Syonyk 6y ago
Short 'em through a resistor, it's easy enough to fully discharge them. You damage them if they're left discharged for too long, but for short periods, it might be fine. Unfortunately, they also tend to swell when fully discharged. "Disassembling lithium batteries without destroying them or your workshop" is depressingly hard.

zackees 6y ago

Likely works for larger EV type batteries though..?