Cable lug with shell-shaped part and fastening device

System for fastening a round conductor to a connection element, comprising:

• a connection element, which at one end comprises an at least partially shell-shaped part,
• a round conductor closed with a contact element, wherein the contact element is adapted for contacting the connection element, and
• a fastening device, which is adapted to fasten in a frictional manner an end region of the round conductor lying in front of the contact element in the region of the shell-shaped part of the connection element to the connection element
• wherein the fastening device comprises a metal shell element formed substantially U-, V- or C-shaped in cross-section, which at the two open ends has respectively an edge region that is complementary to a respective edge region of the shell-shaped part of the connection element, and wherein the metal shell element is connected by adhesive bonding in such a way to the respective edge region of the shell-shaped part of the connection element that the metal shell element and the shell-shaped part form a one-piece ring embracing the end region of the round conductor.