here some more pics from the build
this build i wanted to try something different… i usually solder a piece of 12ga across the series connects to help with the ampacity for each group… this made me ask WHY should I spot weld nickel across the series connections in the first place if its not enough (probably is but up for debate) for the spec’d current. For me the main answer would be “pack rigidity” keeping everything nice n tight and snug together but also makes it a real pain in the ass to service the pack should there be a group that dies or what ever… so i opted not to spot weld across the series… (except for these little things)
since I also am tight on space using a case meant for 18650s thin and flat were the goal.
I opted to try copper braid… cut some strips of nickel and solder up up direct so no heat transfers to the cell…
make sure you have plenty of solder as braid drinks that shit like juice… after they were all done the nickel legs could be trimmed to size before spot welding…
spot welded on and one side taped up all sexy like…
added bms wires to one side…could have made the 2 wires more length wise so they didnt cross but next time… after this first side was done I slipped on my new favorite, clear shrink wrap, over it to fish the pack-to-pack series wire through…
This go I wanted each pack to have its own extra sexy layer of wrap/insulation…
made sure everything was good and all lined up…i used a small strip of foam between each pack to prevent any rub through from side to side as well… then shrink wrapped the whole thing one last time in black wrap as clear was more expensive for the size i needed…