Here is my approach for the Battery.
I used 18650 cells to build 2 12s4p packs.
The cells are Samsung 25 R (Samsung INR18650 25R) with maximum discharge current of 20A continuous --> this means the battery can deliver 80A continuous (and I have 2 Batteries in parallel so 160A). Max discharge off 400A for 1 second per Battery.
One is done by now, the other I still have to assemble.
The approach is to make a Battery with a integrated fuse. Without welding or battery/Cell soldering.
The connecting wire should have a proper cross section (not like the standard nickel stripes) to reduce heat generation.
I was inspired by the battery holders from Thingivers and designed my own holders with 6 Cells, connectable in a diagonal pattern.
For the connection I used woven copper wire normally used for ground cables.
The Terminals are screwable (M6), and a fuse is integrated.
I soldered only the balancing cables to the woven coper wire.
For the next battery I thing about plating the coper with silver to prevent corrosion and improve lifetime.
Here are the CAD Files and some pictures of the assembly. Hope this will inspire somebody or be helpful: