It's possible, but it's tricky. You have to be really careful not to get the cell too hot. Use a high temperature setting with a contact time short as possible. Buff and flux the area to be soldered beforehand. I use Scotchbrite since it's non-metallic and works well.
After I made that post before, I later realized I was damaging the seal on the top cap a little bit. So, it's even more tricky than I initially stated. However, I'm soldering the negative side up by the top cap. If you solder the negative side at the bottom, the cell will be more tolerant. In any case, that top cap seal is the most heat sensitive part of the cell.
There's a plastic film inside the cell insulating the plates that is also heat sensitive. You don't want to solder on the side of the cell unless it's at the top or bottom away from that film. If that film gets damaged the cell will short internally and you don't want that.
Oh, BTW, the proper way to make battery packs using the round cells is by attaching tabs with a capacitive spot welder. You can Google it and find a bunch of articles on how to make a welder for cheap using a couple big capacitors. People do that a lot to make packs for electric scooters and stuff. If you plan to make a lot of packs or some big ones, that's the best way to go about it.