Electric power conversion unit for improving cooling efficiency

1 . An electric power conversion unit comprising:

a first housing;

a fluid machine that generates a flow of a refrigerant at an inside of the first housing;

a heat release member that forms a flow path of the refrigerant on an upstream side of a flow route of the refrigerant at the inside of the first housing;

a plurality of first elements in which the first elements are arranged and aligned along a direction which intersects a flow direction of the refrigerant in the heat release member on an element arrangement plane of the heat release member;

a plurality of second elements in which the second elements are arranged on a further downstream side than the plurality of first elements in the flow route; and

a second housing that supports the plurality of second elements so as to cause the refrigerant to flow between adjacent second elements,

wherein the second housing includes:

an upper portion having a plate shape and having insertion holes in which the second elements are individually inserted,

a support member having a plate shape and on which the second elements are provided,

a plurality of upper openings through which the refrigerant passes, the upper openings being formed between the insertion holes in the upper portion, and

a plurality of support portion openings through which the refrigerant passes, the support portion openings being formed at positions that avoid the second elements of the support member.

2 . The electric power conversion unit according to claim 1 , comprising:

a partition member that forms a region separated from the flow path; and

a substrate that is arranged in the region and controls a drive of the plurality of first elements.