ELECTRIC POWER CONVERSION DEVICE

To obtain an electric power conversion device with which a capacitor element is efficiently cooled and the heat-induced degradation of the capacitor element is suppressed.SOLUTION: The electric power conversion device comprises a power module that has a module body part and a power terminal, a capacitor module that has a capacitor body part that accommodates a capacitor element and a capacitor busbar that projects from the capacitor body part and is connected to the power terminal, and a housing that accommodates the power module and the capacitor module. The housing has a first surface to which the power module is thermally connected, and a second surface to which the capacitor module is thermally connected, with a coolant flow path for cooling the first surface provided to the reverse side of the first surface. The capacitor busbar is thermally connected to the first surface, with the second surface disposed facing the normal direction, on one side of the first surface in a first direction, and closer to the normal opposite direction side than the first surface. The housing has a step between the first and second surfaces, with the coolant flow path disposed on the other side of the step in the first direction.SELECTED DRAWING: Figure 7 【課題】コンデンサ素子を効率的に冷却し、コンデンサ素子の熱に起因した劣化を抑制した電力変換装置を得ること。【解決手段】モジュール本体部、及びパワー端子を有したパワーモジュールと、コンデンサ素子を収容したコンデンサ本体部、及びコンデンサ本体部から突出し、パワー端子と接続されたコンデンサバスバーを有したコンデンサモジュールと、パワーモジュール及びコンデンサモジュールを収容した筐体と、を備え、筐体は、パワーモジュールが熱的に接続された第一面と、コンデンサモジュールが熱的に接続された第二面とを有し、第一面の裏側に、第一面を冷却する冷媒流路が設けられ、コンデンサバスバーは、第一面に熱的に接続され、第二面は、法線方向を向き、第一面の第１方向の一方側であって、第一面よりも法線反対方向側に配置され、筐体は、第一面と第二面との間に段差部を有し、段差部の第１方向の他方側に冷媒流路が配置されている。【選択図】図７