A power electronics component of an electrified drive train of an electric motor vehicle, hybrid motor vehicle or fuel cell vehicle, which is designed as a DC/ DC converter of an electric motor vehicle, hybrid motor vehicle or fuel cell vehicle, comprising: an injection-moulded housing comprising a housing body made of two or more parts (2, 34), which is designed such that it encloses the power electronics component substantially completely; and a cooling pipe integrally moulded at least partially into the housing body (2, 34), which is intended for a refrigerant to flow through this cooling pipe during operation; wherein the housing body is made of a plastic material with good thermal conductivity; wherein the housing body (2, 34) made of plastic material with good thermal conductivity encloses the power electronics component substantially completely, and wherein the cooling pipe integrally moulded at least partially into the housing body (2, 34) is connected or connectable to a cooling circuit such that a refrigerant flows through this cooling pipe during operation, characterised in that the housing body is formed from a plastic material with good thermal conductivity, from polyamide(s) or from polycarbonate(s), which is filled with a metallic filler, namely copper or aluminium, or with a ceramic or mineral filler, namely boron nitride, graphite or glass fibres and in that the cooling pipe that is at least partially integrally moulded into the housing body (2, 34) is made of an aluminium alloy of the 3000 series, the 5000 series, the 6000 series or the 9000 series, or of a copper alloy of CuNi10Fe1Mn or CuNi30Mn1Fe. an injection-moulded housing comprising a housing body made of two or more parts (2, 34), which is designed such that it encloses the power electronics component substantially completely; and a cooling pipe integrally moulded at least partially into the housing body (2, 34), which is intended for a refrigerant to flow through this cooling pipe during operation; a housing body made of two or more parts (2, 34), which is designed such that it encloses the power electronics component substantially completely; and a cooling pipe integrally moulded at least partially into the housing body (2, 34), which is intended for a refrigerant to flow through this cooling pipe during operation; wherein the housing body is made of a plastic material with good thermal conductivity; wherein the housing body (2, 34) made of plastic material with good thermal conductivity encloses the power electronics component substantially completely, and wherein the cooling pipe integrally moulded at least partially into the housing body (2, 34) is connected or connectable to a cooling circuit such that a refrigerant flows through this cooling pipe during operation, characterised in that the housing body is formed from a plastic material with good thermal conductivity, from polyamide(s) or from polycarbonate(s), which is filled with a metallic filler, namely copper or aluminium, or with a ceramic or mineral filler, namely boron nitride, graphite or glass fibres and in that the cooling pipe that is at least partially integrally moulded into the housing body (2, 34) is made of an aluminium alloy of the 3000 series, the 5000 series, the 6000 series or the 9000 series, or of a copper alloy of CuNi10Fe1Mn or CuNi30Mn1Fe.