I don't doubt you could run into problems in extreme cold, but our Model Y SR (LFP pack) has been fine charging in -5C or so. The car is pretty good at managing thermals and making sure the battery doesn't get too cold.
Right, you need a heater to keep things happy! I added a little heater to my LiFePO4 battery packs that live outside. It seems fine like that to take the edge off. Way better than exploding!
