Help building battery triangle 20s10p

[thundercamel]

Well...

There are many different ways that the groups can be laid out, but the arrangement as above leaves four cells separated on the right hand side.

It is possible to work with this, but it will require some copper wire to bridge the four and six cells together to make a 10p group. If you are able to move those four cells to the left hand side, things become easier. An arrangement like this would only require copper to be added to the white strip between the blue and yellow group on the left side, in addition to the positive and negative output terminals of course.

White lines show all the nickel strips needed on the side with the positive and negative output terminals, and black lines show all the nickel strips needed on the other side of the battery. The picture below shows examples on the right hand side shows how I handled the same situation, with positive/negative output terminals and a long copper bridge that would represent your white line between the blue and yellow groups. That copper is only soldered to the nickel strip beneath, and the nickel strip is what's welded to the cells. Solder is placed between the cells to minimize heat getting into the cells. I'm sure other people have different methods as well.

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[adam125r4]

It’s very tight and I want to add some foam on the top. The cardboard thing represents the bms. The seller sent it but it got lost so now I have to buy another one and it’s still in shipping. The purple arrows are where a cell can fit

 

[thundercamel]

Alrighty. Since your shape is fixed, then we'll go with the previous arrangement I showed above. It will take a couple wires to join together cell group 17, which is broken into two pieces. Of the 100 amp load, the white wire would handle 60 amps, and the black wire 40 amps. Maybe just use 8 gauge wire for both?

 

[brownj24]

I am building a similar back (20s13p) to fit into my mountain bike triangle frame.

What is the benefit of this approach vs only using nickel strips and a pattern like mine, where I am trying to maximize cell-to-cell series connection points between the 20 parallel groups?

Thanks!https://drive.google.com/file/d/1beGfaypj_0Z5UnA8cUbLB96SKp-EmzW1/view?usp=sharing

 

[thundercamel]

It's been a while since I was on this thread, but I was also trying to maximize cell-to-cell series connections. In the last pictures I posted, the goal was 100 amps divided by 10 parallel cells using pure nickel strip at 8mm wide 0.15 thick. That required the nickel to be doubled up to handle 10 amps between each cell series connection. I was trying to make sure each series connection between cell groups had all 10 doubled up nickel strips from all 10 cells directly to the next 10 cells, and ended up with one bridge which would require some copper wiring to the other part of the pack.