Patent attributes
With respect to a stack unit in which a plurality of power cards and a plurality of coolers are stacked, each of the plurality of power cards housing semiconductor element, a technique for improving the fitting of a stack unit to a housing is taught. A stack unit is a unit that coolers and power cards are stacked. An outer frame binds a stack of the power cards and the coolers. The outer frame pressurizes the stack along with the stacked direction. Each of the coolers comprises a main body and a metal plate. The main body includes a flow channel of coolant and an opening provided at a position facing the power card. The metal plate has one surface closing the opening. A seal between the opening and the metal plate is secured by pressure of the outer frame.
