providing a flat conductor having a primarily rectangular profile characterized by two wide surfaces opposite each other and two narrow surfaces opposite each other,

wherein the flat conductor extends along a longitudinal axis, wherein a vertical axis extends along a surface normal of the wide surfaces of the flat conductor, and a transverse axis extends along a surface normal of the narrow surfaces of the flat conductor, and

the flat conductor is bent about the vertical axis so that the flat conductor has an inner bending radius and an outer bending radius,

wherein before the flat conductor is bent about the vertical axis, the flat conductor is formed about the longitudinal axis in a region of the inner bending radius at an inner side edge arranged at the inner bending radius with a degree of forming that decreases from the inner side edge to an outer edge located at the outer bending radius.