shaping of the sca regions and the connection regions of the carrier structure two objectives which affect each other mutually exist in order to keep the bonding wire length as short as possible the connection region should be introduced as close as possible to the sca region however this impairs the radial heat dissipation from the cell since the sca regions and connection region can no longer be connected to each other via the metal strip surface after the punching therefore the connection region is advantageously configured as a tongue which protrudes slightly into the sca region as an optimum compromise between bonding wire length and limiting of the heat conduction the minimum spacing relative to the cell surface should be between 1 and 10 mm better between 2 and 5 mm the rear side plate can have a double insulation in order to achieve high system voltages in current systems u02dc 800 v good insulation must be ensured in order to ensure the necessary safe insulation the rear side plate is provided with a double insulation a 1 insulation in the sca direction interior insulation layer b 2 insulation in the direction of exterior air or second rear side plate exterior insulation layer this.