I need to build a new battery pack becuase my old 12s5p with 30q’s short cuircuted due to water damage (i’m not actually that mad about it because to be honest it wasn’t such a well built pack anyways and it gives me the opportunity to build a much better enclosure), i chose the 40t’s over the 30’s because of the higher discharge and capacity, but also because for the same overall capacity of the pack it is a little bit cheaper. The cells in the old pack were arranged so that they were perpendicular to the length of the board with 2 rows. Since I’ll be using the longer 21700 cells, i don’t think this arrangement would work as the pack would be too wide to fit on the deck. I’m thinking to put the cells flat and parallel to the board, but not sure how to solder together the p groups this way. I was thinking to put it double fish paper layers on bend the nickel strips over the top of the p groups and solder it that way. What do you guys think about this?
Instead of this:
I was also using a smart bms in the old pack, but 2 of those have failded on me already and they take up a lot of space in the enclosure, so was thinking of using a more conventional BMS this time. I know that the bestech BMS’s are good, but any other suggestions?