A feedthrough, for example through a part of a housing, such as a battery housing, is, for example, made of a metal, such as a light alloy, for example aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium, a titanium alloy, steel, stainless steel or high-grade steel. The housing part has at least one opening through which at least one conductor having a cross-section is guided in a glass or glass ceramic material. The conductor has at least two sections, a first section having a first, substantially round, for example a circular, cross section having a diameter in the region of the feedthrough through the glass or glass ceramic material, and a second section having a second, substantially non-round, for example a substantially rectangular cross-section, and the conductor is formed in one piece.