houseofancients
Solar Wizard
the purpose of the copper rings is to crush and provide a better and absolutely flat contact area between the busbar and cell terminal.Thank you for all the replies and advices. I torqued the BMS busbars at 7 Nm and the cells busbars at 5 Nm
I torqued the compression plate at 9 Nm and the rest manually, like houseofancients said it's less important.
I also watched the Andy's video and saw he didn't put the copper washers between the cells terminals and the busbars.
When I assembled the battery, I put them, but now I think it was maybe not a good idea, as the terminals and seplos busbars are in aluminium, what is the goal to had copper beetween ?
I also "cleaned" cells terminals with a 600 sand paper (using a technique I saw on a "Ray builds cool stuff" video) and sand the part of the aluminium busbars in contact with the copper washer.
I also added MG847 paste between cell terminal and copper washer (but not between copper washer and aluminium busbars)
Do you know why Seplos choose aluminium busbars ?
After reading lot's of threads and comments under Andy's video, I think it maybe not a good idea to keep aluminium busbars / copper washers
I still have the tinted copper busbars delivered with my Docan's cells.
What do you advice me to do for good and long lasting connections ?
1) Keep it like that (Seplos aluminium busbars + Seplos copper washers on cell terminals)
2) Replace aluminium busbar by Docan's tinted copper busbars (and keep or remove copper washers ?)
3) Other solutions ?
if using soft aluminium or copper busbars, and using the correct torque, the shouldnt be needed.
any bad, or less than optimal connections will generate heat , and a flir camera ( or touch) would reveal that
i think Seplos choose aluminium for the busbars because the cell terminals are aluminium , and the bms does calculate the resistance at specific points in your build...
any how, it think , reading above , you'll be just fine