Semiconductor module and vehicle

A semiconductor module comprising a semiconductor device and a cooling apparatus, wherein

• the semiconductor device includes semiconductor chips, circuit boards where the semiconductor chips are implemented, and a resin structure for sealing the semiconductor chips;
• the cooling apparatus includes:
• a top plate in which the circuit board and the resin structure of the semiconductor device are fixed on its principal surface;
• a side wall connected to the top plate;
• a bottom plate connected to the side wall and facing the top plate;
• a coolant flow portion for distributing coolant which is defined by the top plate, the side wall and the bottom plate;
• an inlet for introducing the coolant to the coolant flow portion;
• an outlet for deriving the coolant from the coolant flow portion;
• and
• a plurality of fins and reinforcement pins arranged in the coolant flow portion and extending for connecting between the top plate and the bottom plate;
• the coolant flow portion includes:
• a coolant region where the plurality of fins are arranged;
• a first communication region adjacent to one side of the cooling region and communicated with the inlet, and not arranged with the plurality of fins;
• and
• a second communication region adjacent to another side of the cooling region that is an opposite side of the one side and communicated with the outlet, and not arranged with the plurality of fins;
• wherein
• the circuit board is a laminated substrate sequentially including an insulating plate with an upper surface and a lower surface, a circuit layer provided on the upper surface, a metal layer provided on the lower surface;
• the metal layer has a part overlapped with the cooling region, and parts other than the part overlapped with one communication region of the first communication region and the second communication region in planar view;
• the reinforcement pins are arranged in the first and second communication regions at each corner of the metal layer;
• and
• a cross sectional area of the reinforcement pins is smaller than a cross sectional area of at least one fin of the plurality of fins in a plane parallel to the principal surface of the top plate.