Patent ID: 8387685

Claim:
A heat sink for a power module in which a power device is mounted to at least one face, and heat from said power device is radiated by a cooling medium circulated within a refrigerant flow path arranged in the interior, said heat sink comprising: a laminating body in which plural flow path plates formed in a plate shape and concavely arranging plural grooves parallel to each other on a flat joining face are arranged, and each groove is set to a parallel flow path parallel to said one face by laminating each flow path plate by each joining face, and a portion other than each groove of each joining face forms a heat transfer path to each parallel flow path of the laminating direction, said heat transfer path is formed such that a heat transfer area is gradually reduced from said one face side; a first side plate joined to a side face of one end side of said laminating body and communicated with one end of each parallel flow path, and forming a flow-in path for flowing said cooling medium into each parallel flow path; and a second side plate joined to a side face of the other end side of said laminating body and communicated with the other end of each parallel flow path, and forming a flow-out path for flowing said cooling medium out of each parallel flow path; and said refrigerant flow path is constructed by the flow-in path, each parallel flow path and the flow-out path, wherein a flow-in hole is mounted on the first side plate such that the flow-in hole communicates with the flow-in path and projects in a direction in which the plural grooves on each of the flow path plates are aligned parallel to each other, and wherein a flow-out hole is mounted on the second side plate such that the flow-out hole communicates with the flow-out path and projects in a direction in which the plural grooves on each of the flow path plates are aligned parallel to each other.