Electric power converter device with improved integration of cooler frame

An electric power converter device, comprising:

• a first power semiconductor module;
• a frame for a closed cooler,
• the first power semiconductor module including
• a first base plate having a first main side, a second main side opposite the first main side and a lateral side surface extending along a circumferential edge of the first base plate and connecting the first main side and the second main side;
• and
• at least one first die located on the first main side of the first base plate,
• wherein the frame is attached to the second main side of the first base plate, and the first base plate has a first step on the second main side along the circumferential edge of the first base plate to form a first recess along the circumferential edge of the first base plate, wherein in the first recess a first portion of the frame is received, wherein the first base plate is made of aluminum silicon carbide (AlSiC), or a combination of copper and aluminum, and the first portion of the frame is fixed to the first base plate by a welding connection which is a butt weld produced by laser welding;
• and
• a molded encapsulation, which encapsulates the first main side and the lateral side surface of the first base plate such that a bottom surface of the encapsulation is flush with the first base plate at the circumferential edge of the first base plate on the second main side.