When compared to standard round cable, flexible busbar offers space saving advantages due to a tighter bend radius and the ability to replace multiple round conductors with a single piece of flexible busbar. Compare flexible and rigid busbars. Learn when to use each type, material options, current ratings, and design considerations for battery packs and ESS systems. The. The flexible busbar is crafted with multiple layers of aluminum or copper foils. Non-Rigid busbars resemble the poles for hanging clothes, while Rigid Busbar is similar to sturdy metal rods that are in a straight row all stacked closely together. They are good conductors like these bars that have to carry electricity over a long distance.