don’t just layer nickel on top of nickel. do some tests.
i’ve noticed a nickel to steel (cell) weld is far stronger than a nickel to nickel weld. i’ve had to redo a whole set of welds because a 2nd layer of nickel, after time, just started falling off on its own. i was using a sunkko 709a.
I second this… For some reason the nickel doesn’t weld to itself very well so I use heavier nickel in the first place. My series welds (mostly because I need a flexible pack for Evolve boards) are all done with 10awg silicone wire which can easily handle the current.
I advise using the widest nickel strip you can for your series welds, 15/18mm 0.2mm strips should be sufficient for esk8.
I’m convinced literally everyone is mega overdoing it. I hardly have anything real to back this up I just have never heard of anyone ever burning up strips due to not being able to handle current.
One strip of .15 thick for me. And it’s a 13S4P pack that’ll pull prob 45-50a at bursts lol
It’s not precise according to what I recall.
If you connect each battery in a cell to the series connection point that will be ok(for example if you have 4p you will have to connect each cell 4 times to the series connection point).
Since we are talking about one strip of nickel for a cell and assume you take the series connection point in the end of every cell, all the current will flow through the nickel strip at the point of connection to the last battery of the cell(where the series point is)
The first battery nickel strip connection though will handle 1/4 of the current and the second one 2/4 and so(assuming 4p).
Therefor you should have enough conduction in each cell as for the series ones.
Nice bed time story
i’ve ben using 10mm x 0.2mm nickel on my 12S5P all year. How you stack your cells is just as important as what/how much nickel you use because you don’t need two layers of 10x0.2 if you’re bridging the series connections with two parallel rows of nickel that are bridged with each other using short strips.
that’s for a non-flexible tightly packed battery though. for evolve packs and other single layer packs i use either 12awg or 14awg 1" jumpers between twin P groups for flexibility.
I just have 1 layer everywhere and didnt even made the terminals double layer also it was a pain in the ass to solder on the nickel I had to use a flame powered soldering iron…
Are you saying to solder copper wire to some nickel strips and then weld those strips to the battery? What size wire would you recommend for 2 motors rated at max 95 amps each?