Method for producing a cathode device for a battery, in particular of a motor vehicle, - wherein a cathode strip is provided, - wherein a cathode is cut out of the cathode strip, - wherein the cathode is introduced between two strip-type separator films, and - wherein the two separator films are cut to size to form corresponding separator film segments in a region projecting over the cathode and the two separator film segments are connected to one another, in particular fused to one another, in this region, or - - wherein a single strip-type separator film is folded and arranged on the cathode in such a way that the bent edge of the separator film bears against a bearing side face of the cathode, and that the cathode is covered on both sides by a respective separator film section of the separator film, wherein the strip-type separator film is folded with a bent edge along the strip longitudinal direction thereof, and wherein the separator film is cut to size in a region of side faces of the cathode which both projects over the cathode and faces away from the bearing side face, and the two separator film sections are connected to one another, in particular fused to one another, characterized in that the two separator film segments or the two separator film sections are connected to one another during the cutting to size. - wherein a cathode strip is provided, - wherein a cathode is cut out of the cathode strip, - wherein the cathode is introduced between two strip-type separator films, and - wherein the two separator films are cut to size to form corresponding separator film segments in a region projecting over the cathode and the two separator film segments are connected to one another, in particular fused to one another, in this region, or - - wherein a single strip-type separator film is folded and arranged on the cathode in such a way that the bent edge of the separator film bears against a bearing side face of the cathode, and that the cathode is covered on both sides by a respective separator film section of the separator film, wherein the strip-type separator film is folded with a bent edge along the strip longitudinal direction thereof, and wherein the separator film is cut to size in a region of side faces of the cathode which both projects over the cathode and faces away from the bearing side face, and the two separator film sections are connected to one another, in particular fused to one another, characterized in that the two separator film segments or the two separator film sections are connected to one another during the cutting to size. - - wherein a single strip-type separator film is folded and arranged on the cathode in such a way that the bent edge of the separator film bears against a bearing side face of the cathode, and that the cathode is covered on both sides by a respective separator film section of the separator film, wherein the strip-type separator film is folded with a bent edge along the strip longitudinal direction thereof, and wherein the separator film is cut to size in a region of side faces of the cathode which both projects over the cathode and faces away from the bearing side face, and the two separator film sections are connected to one another, in particular fused to one another,