I'm not exactly sure. I know my oldest are calb ones and I have a lot of aluminum cells too from various manufacturers. I use them in my box truck conversion RV. I just compress them and nothings ever come lose. I use overkill wire sizes too 0 awg, even though I only draw 50-75 amps per pack. I have never had one come lose. I just make sure the batteries can't move. you don't want to increase the resistance in any way shape or form which is what thread locker will do. This is in a mobile installation.Actually use of Loctite or any thread locker is a good idea. I don't know what cells you are using but the threads in these cells are very weak. The EVE cells have 5 or 6 threads to work with and the cell terminal threads are soft aluminum. Generally tapped by the suppliers.
4nm or 35 in lbs is what we have found to be a safe torque. EVE's specs state to limit torque to 8nm to prevent damage to the cells terminal. I think Lishen is in the same ball park. However recently cells are being sold with laser welded studs. This might present it's own problems because we are not sure how many amps the connection can support.
The bulk if not all of the current is carried by the busbars, not the machine screws or studs. If a busbar is loose then of course it could heat up and cause problems. I am not so sure that's what happened here. There has been a lot of speculation and it's all interesting. No one knows for sure what caused the fire and we will most likely never know.
Who is the manufacturer of the cells you have had in service for many years? Are they aluminum cased cells? And what type of metal are your cells terminals constructed of?