Originally Posted by ruckus
The Thundersky manual recommends that bulged cells be compressed in a giant clamp/vise thingy to bring it back to square before further use. I would be interested if such an operation could "save" this beastly looking cell.
We tried compressing several bulged TS cells with a 20T bearing press.... After gradually increasing the pressure over a period of several hours for each one we got them back to looking
normal, but they never did act normal again. The internal resistance remained elevated and the rate of self-discharge went from being practically non-existent to very noticeable. The cells bulge in the first place because the electrolyte has been dissociated into gaseous components (like passing current through water creates Hydrogen
and oxygen) and those aren't ever going to reform into electrolyte again just by squeezing on the container!
Note that it is possible for the higher volatility solvents in the electrolyte solution to selectively "boil" which would also cause a cell to swell. If that is the culprit then putting the cell in the fridge for a few hours will reverse it; that won't work if the electrolyte has been dissociated from overcharging (above 4.3V) or reversal (below -0.4V).