/diy/ - Do It Yourself

>>2600098

You'd need some very heavy copper in order to support 300A with the amount of space you're going to have available between cell groups, or some unusual construction perhaps involving multiple stacked PCBs. There are more practical ways of doing it, including just straight-up soldering wire/copper sheet to the traces.

Most high-current packs just don't use PCBs as anything more than an intermediary between the cells and bus wires, if they use them at all.

The most practical construction method I've seen is just a basic holder for the cells made of wood or plastic. The holder has an open grid on both sides to both hold the cells and allow space for bus strips. Pic related. They're common and inexpensive, and I believe do exactly what you wanted your original PCB idea to do. It's what I did for my ebike, except I just printed the holders myself and the cells had screw terminals, so no welding required.