OK guys so i've just built a B52 Bomber battery 22S10P using LG MJ1 3500 mAh cells
i've used 5mm wide 0.2mm thick solar panel bus tape - its tinned copper.
scotchbrite the tops/bottoms of the cells and tinn them with solder and 80W iron, takes less than a second using fairly heavy gauge solder.
result - far quicker than spot welding nickel (I have a 12V battery type spot welder)
resistance vs 8mm wide 0.15 Nickel is 3x the current carrying capacity.
Bomber pulls 75A max so 7.5A / cell draw which is well within the 10A continuous they are rated at.
After a 40km ride i've eaten through 30AH of the 35Theoretical per the Cycle analyst, battery warm to touch - motor well not so much and whilst I haven't melted the 5304 yet I think the possibility exists.
In all at $11 for 10m of the tinned copper bus bar strip I was just a little short and needed about another meter of it.
have done a botch and connected the end cells to the bike wiring via copper braid and still waiting for the BMS, i think its a viable solution for a home builder vs spot welding which using nickel IMHO is an inferior solution for current carrying.
sag at 6000W is only 3-5V depending on the pack voltage to start with.
Obviously soldering nickel is nigh on impossible so for both performance enthusiasts for the 3x current carrying capacity and home builders without spot welders alike I think the tinned copper is a great solution.
tables tell the story for me
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