There are via’s on the place where the balance lead crosses
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you’re not the only one. I’m not so sure about this “use nickel strip as a fuse” thing either.
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If this is a two layer board as u said wouldn’t we see the via holes?
I’ve welded to pcbs hundreds of welds onto 2oz copper with .2mm nickel flawlessly everytime with no seeming damage to the board and it’s a strong connection. (7miliseconds w akura lipo welder as standard for .2 nickel). Maybe not the best way but seems to work fine and easier than soldering. I can show u a vid of me ripping nickel off to show how strong the connection is. I imagine it greatly depends on the settings and stuff
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Do you plan to make 12S4P version of it ? 
Maybe in future, but than it will be even longer 
Sorry, but this amount of via’s is not even close to any current rating at all… Also it is bad idea to wield to copper on pcb as you can tear off copper from substrate (FR4) on wield point
EDIT: P.S. You current test can be max 10A and for bit bigger can be 80A so without real life data like current graph with voltage drop, and temperatures its hard to even say it can handle large amount of current especially with scarce amount of via’s which transfer current between sides
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I got 12 4p
in the works im gunna put up for super cheap. I was surprised to find the local pcb place here in the bay area will go from my hand drawing. the whole process SHOULD take like 3 days from design to being in hand with how fast pcb places do stuff. If someone else had sold one that I believed in cheaply I wouldn’t bother.
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Yeah I know there could be more via’s … Don’t know why they choose to it like this
What do you mean max 10A current?
You welded .3mm nickel? How many amps and pulses did you use?
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I did it with the arduino spotwelder from https://malectrics.eu/ powerd by a big car battery, wasn’t an issue
so is there anywhere to order where i dont need to purchase 1000 units?
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yes here
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do you have any details on this? as i wrote above it looks like its got one trace coming back and the other side is cut by balance traces and almost no vias anyway.
how many oz? how many layers? its 1.6mm which is the standard and it looks two sided
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It’s 2 layers of 1.5oz 30mm wide for the long piece.
Yes it would be better with more via’s Will be for the next batch
kind regards
Frederic
that’s definitely not up for the challenge of an eboard. not even 2oz and the long trace back is only effectively on the one side. im guessing the same copper content on that one side as maybe an 18awg wire but you can look it up easily
yeah well I tested it on real eboard conditions and there was no problem at all
Will do some test with current measurement as kug3lis mentioned.
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.053mm x 30 = 1.5mm^2
from what I see that’s equivalent to 16awg. pcbs have higher ampacity rating because they can dissipate the heat better but maybe that’s assuming not in a tight box on a board.
It’s not even 2oz… With that design at 60A this PCB will be pretty warm 30-40C rise… Those vias will not share the current at all. Via of around 0.8mm diameter and 20um platting will hold max around 2.5A…
But you will never discharge your board at 60A continious, migh be peaks of couple seconds.
Unless you’re going fullpower uphill for a couple of minutes you might have indeed some temp rise.
But I will do some testing with actual numbers in current and temperature
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