The battery builders club

Ok check my work as im getting to the point of pita to roll back and correct my work, shooting for 100a continuous and burst to 200a pack and my bottle neck is in the p group i had to make in a shitty layout.

18s6p p45b with major space constraints because i want to use what i have for the enclosure.





Solder isn’t complete just in place so I don’t have to pump too much heat. Just doing a little then letting it cool and going back.

The 1, 7, and 13 p groups are the elongated non standard ones. The outside most nickel is 35mm wide .2 and is soldered to the long braid under the pack with #10awg equivalent tinned copper. The nickel here should be good for about 60a easy but 100a in bursts so should be fine to move the current from those two cells.

The braid attaches to the lower wings of the center pair of cells (parallel) which is 30mm .2 and is now carrying the current of all 6 cells and stacked with the 35mm .2 that is on the top of the pack that butterflies open.

Because of how i needed to run the braid underneath i didn’t make the nickel at the center connection for the outside two pairs go both ways like i did for the center two cells and i think i might need to derate it as a result. I just wanted more separation between potentials and this is my compromise.

That bottleneck where 4cells are moving current on the 30mm .2 i think should be considered 60a max continuous and only burst for 100-120a and so I should consider this a 90a continuous and 180a burst build.

Just for reference i use the Chart from the conductor current ratings as a reference and green as my continuous and red as my max.

Also separately this is a high potential small gap area and ive since added fish paper to get better isolation:

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