Liquid-cooled electric drive component, powertrain, vehicle and method

1. A liquid-cooled electric drive component for a powertrain of a vehicle, comprising a first single-piece housing part and a second single-piece housing part, said first and second single-piece housing parts having flat surfaces and being joined to one another by a fluid-tight welded joint over said flat surfaces and configured such as to form at least a segment of a cooling duct, said cooling duct having a cross section defined by recesses in the first single-piece housing part and the second single-piece housing part and extending along or transversely to the flat surfaces of the first and second single-piece housing parts, said flat surfaces of said first and second single-piece housing parts over which said first and second single-piece housing parts are joined to one another extending continuously over a whole width of said first and second single-piece housing parts and being interrupted only by said cooling duct, wherein the electric drive component is constructed in the form of an inverter which includes at least one power module in thermal contact with the cooling duct, wherein the power module includes a heat sink having at least one part which extends into the cooling duct so that the first single-piece housing part encases the power module except for the at least one part which extends into the cooling duct, said heat sink joined to the first single-piece housing part by a fluid-tight welded joint.

2. The electric drive component of claim 1 , wherein the vehicle is a hybrid vehicle or an electric vehicle.

3. The electric drive component of claim 1 , wherein the first and second housing parts are joined by laser beam welding or by friction stir welding to establish the fluid-tight welded joint.

4. The electric drive component of claim 1 , wherein the first single-piece housing part includes a material which is different from a material of the second single-piece housing part.

5. The electric drive component of claim 1 , wherein the first single-piece housing part is a die-cast part and has a contact surface, said second single-piece housing part resting upon the contact surface, said fluid-tight welded joint being formed on the contact surface.

6. The electric drive component of claim 5 , wherein the contact surface is untreated.

7. The electric drive component of claim 1 , wherein the second single-piece housing part is a member selected from the group consisting of a molded sheet metal part, a casting, a drop-forged part, and a forged part.

8. A liquid-cooled electric drive component for a powertrain of a vehicle, said liquid-cooled electric drive component constructed in the form of an inverter which includes at least one power module in thermal contact with a cooling duct, said liquid-cooled electric drive component comprising:

a first housing part which encases at least part of the power module, said first housing part including an aperture, said power module being arranged on one side of the aperture and said cooling duct being arranged on another side of the aperture;

a second housing part, said first and second housing parts having flat surfaces and being joined to one another by a fluid-tight welded joint over said flat surfaces and configured such as to form at least a segment of the cooling duct, said cooling duct having a cross section defined by recesses in the first housing part and the second housing part and extending along or transversely to the flat surfaces of the first and second housing parts, and

a third housing part arranged in the aperture and including a third material having a thermal conductivity which is greater than a thermal conductivity of a material of the first housing part, said first and third housing parts being joined to one another by a further fluid-tight welded joint.

9. The electric drive component of claim 8 , wherein the first and third housing parts are joined by laser beam welding or by friction stir welding to establish the further fluid-tight welded joint.

10. A method for producing a liquid-cooled electric drive component, comprising;

die-casting a first single-piece housing part having a flat surface;

placing a second single-piece housing part having a fiat surface on the flat surface of the first single-piece housing part; and

joining the first and second single-piece housing parts by a fluid-tight welded joint at the flat surfaces such as to form a cooling duct defined by recesses in a wall of the first single-piece housing part and the second single-piece housing part and extending along or transversely to the flat surfaces of the first and second single-piece housing parts, and

extending said flat surfaces of said first and second single-piece housing parts over which said first and second single-piece housing parts are joined to one another continuously over a whole width of said first and second single-piece housing parts so that they are interrupted only by said cooling duct,

wherein the electric drive component is constructed in the form of an inverter which includes at least one power module in thermal contact with the cooling duct, wherein the power module includes a heat sink having at least one part which extends into the cooling duct so that the first single-piece housing part encases the power module except for the at least one part which extends into the cooling duct, said heat sink joined to the first single-piece housing part by a fluid-tight welded joint.

11. The method of claim 10 , wherein the contact surface is untreated.

12. A powertrain for a vehicle, comprising a liquid-cooled electric drive component which includes a first single-piece housing part having a flat surface and a second single-piece housing part having a flat surface, said first and second single-piece housing parts being joined to one another by a fluid-tight welded joint at the flat surfaces and configured such as to form a segment of a cooling duct, said cooling duct having a cross section defined by recesses in a wall of the first single-piece housing part and the second single-piece housing part, said flat surfaces of said first and second single-piece housing parts over which said first and second single-piece housing parts are joined to one another extending continuously over a whole width of said first and second single-piece housing parts and being interrupted only by said cooling duct, wherein the electric drive component is constructed in the form of an inverter which includes at least one power module in thermal contact with the cooling duct, wherein the power module includes a heat sink having at least one part which extends into the cooling duct so that the first single-piece housing part encases the power module except for the at least one part which extends into the cooling duct, said heat sink joined to the first single-piece housing part by a fluid-tight welded joint.

13. The powertrain of claim 12 , wherein the first single-piece housing part includes a material which is different from a material of the second single-piece housing part.

14. The powertrain of claim 12 , wherein the first single-piece housing part is a die-cast part and has a contact surface, said second housing part resting upon the contact surface, said fluid-tight welded joint being formed on the contact surface.

15. The powertrain of claim 12 , wherein the electric drive component is constructed in the form of an inverter which includes at least one power module in thermal contact with the cooling duct, said first single-piece housing part encasing at least part of the power module.

16. The powertrain of claim 15 , wherein the power module includes a heat sink having at least one part which extends into the cooling duct.

17. A vehicle, comprising:

a liquid-cooled electric drive component which includes a first single-piece housing part and a second single-piece housing part, said first and second single-piece housing parts having flat facing surfaces and being joined to one another by a fluid-tight welded joint over said flat facing surfaces and configured such as to form a segment of a cooling duct, said cooling duct having a cross section defined by recesses in the first single-piece housing part and the second single-piece housing part and extending along or transversely to the flat facing surfaces of the first and second single-piece housing parts, said flat facing surfaces of said first and second single-piece housing parts over which said first and second single-piece housing parts are joined to one another extending continuously over a whole width of said first and second single-piece housing parts and being interrupted only by said cooling duct;

wherein the electric drive component is constructed in the form of an inverter which includes at least one power module in thermal contact with the cooling duct, wherein the power module includes a heat sink having at least one part which extends into the cooling duct so that the first single-piece housing part encases the power module except for the at least one part which extends into the cooling duct, said heat sink joined to the first single-piece housing part by a fluid-tight welded joint; and/or

a powertrain comprising said liquid-cooled electric drive component.

18. The vehicle of claim 17 , constructed as a hybrid vehicle or an electric vehicle.