This is an example of how to make a triangle battery pack for electric bike. In this case is a 22s6p , but you can do the size and shape you need using the same technique.
Just think about the shape and pattern and go for it.
I used pure copper tabs for a high performance. The most common is nickel strips.
Use only good quality hot silicone, high temperature melting point. Cheap hot glue is not suited for this kind of use, the heat of the battery could move some cells.
Solder between the cells, never on the contacts. The heat can damage them.
Follow the bms diagram of the seller. Not all the bms are wired the same way. Discard any bms without diagram.
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