Power electronic arrangement with DC voltage connection element and method for its production

1. A power electronic arrangement, comprising:

a power converter module, further comprising:

a switching device with a substrate with a first and a second DC voltage conductor track and a first and a second DC voltage terminal element connected thereto in an electrically conducting manner with a respective correct polarity;

a first and a second DC voltage connection element, wherein the first DC voltage terminal element is connected to the first DC voltage connection element in an electrically conducting manner with said respective correct polarity by means of a respective first materially-bonded connection;

wherein the second DC voltage terminal element is connected to the second DC voltage connection element in an electrically conducting manner with said respective correct polarity by means of a respective second materially-bonded connection, and

wherein proximate each of the respective first and the second materially-bonded connections and between the DC voltage terminal element and the associated DC voltage connection element, the first and second DC voltage terminal element, as well as the first and second DC voltage connection element, is formed respective stacks with a respective first and a second insulation device arranged in between them viewed in the normal direction (N);

the first connection is spaced apart from the second connection perpendicular to the normal direction (N);

the first connection and the second connection do not have an overlap region;

either the first DC voltage terminal element or the first DC voltage connection element rests on a supporting device proximate one of the first connection and the second connection; and

said supporting device is one of a part of a housing of the switching device and a part of a cooling device;

the first DC voltage terminal element or the first DC voltage connection element is arranged by means of a clamping device on the support device directly adjacent to the first connection; and

wherein the clamping device is a threaded connection and with an insulating sleeve at least partially surrounding the clamping device passes in an electrically insulated manner through an opening in the first DC voltage terminal element and also passes through a second opening in the second DC voltage connection element.

2. The power electronic arrangement, according to claim 1 , wherein:

each respective said first and said second materially-bonded connection is implemented as a welded joint.

3. The power electronic arrangement, according to claim 1 , wherein:

the first DC voltage terminal element is arranged in a first main plane;

the second DC voltage terminal element and the first DC voltage connection element are arranged in a second main plane; and

the second DC voltage connection element is arranged in a third main plane; and

and the first main plane, the second main plane, and the third main planes are stacked in the normal direction (N).

4. The power electronic arrangement, according to claim 1 , wherein:

the first DC voltage connection element is arranged in a first main plane;

the second DC voltage connection element and the first DC voltage terminal element are arranged in a second main plane;

the second DC voltage terminal element is arranged in a third main plane; and

the first main plane, the second main plane, and the third main planes are stacked in the normal direction (N).

5. The power electronic arrangement, according to claim 1 , wherein:

the respective first and second insulation devices of the respective two stacks overlap each other in the region between the respective first and second materially-bonded connections.

6. The power electronic arrangement, according to claim 1 , wherein:

each respective said first and said second DC voltage terminal element is a metal foil sheet, with a thickness of 300 μm to 2000 μm.

7. The power electronic arrangement, according to claim 1 , wherein:

each respective said first and said second insulation device is formed of a material selected from a group of plastics with high electrical dielectric strengths including a polyimide, an ethylene tetrafluoroethylene copolymer, and a liquid crystal polymer; and

each said first and said second insulation device has a thickness of 50 μm to 500 μm.

8. The power electronic arrangement, according to claim 1 , wherein:

the first and the second DC voltage connection elements form the DC voltage supply of the power converter module; and

the first and the second DC voltage connection elements are part of a capacitor device.

9. A method for producing a power electronic arrangement, comprising the steps of:

providing a power electronic arrangement; comprising:

a power converter module, further comprising:

a switching device with a substrate with a first and a second DC voltage conductor track and a first and a second DC voltage terminal element connected thereto in an electrically conducting manner with a respective correct polarity;

a first and a second DC voltage connection element, wherein the first DC voltage terminal element is connected to the first DC voltage connection element in an electrically conducting manner with said respective correct polarity by means of a respective first materially-bonded connection;

wherein the second DC voltage terminal element is connected to the second DC voltage connection element in an electrically conducting manner with said respective correct polarity by means of a respective second materially-bonded connection; and

wherein proximate each of the respective first and the second materially-bonded connections and between the DC voltage terminal element and the associated DC voltage connection element, the first and second DC voltage terminal element, as well as the first and second DC voltage connection element, is formed respective stacks with a respective first and a second insulation device arranged in between them viewed in the normal direction (N);

the first connection is spaced apart from the second connection perpendicular to the normal direction (N);

the first connection and the second connection do not have an overlap region;

either the first DC voltage terminal element or the first DC voltage connection element rests on a supporting device proximate one of the first connection and the second connection; and

said supporting device is one of a part of a housing of the switching device and a part of a cooling device;

the first DC voltage terminal element or the first DC voltage connection element is arranged by means of a clamping device on the support device directly adjacent to the first connection; and

wherein the clamping device is a threaded connection and with an insulating sleeve at least partially surrounding the clamping device passes in an electrically insulated manner through an opening in the first DC voltage terminal element and also passes through a second opening in the second DC voltage connection element; and

producing a power electronic arrangement by conducting the steps of:

a. arranging the power converter module with the first and the second DC voltage terminal element relative to a capacitor device with the first and the second DC voltage connection elements, in such a way that a surface connection section of the first DC voltage connection element is on an associated surface connection section of the first DC voltage terminal element, and that a surface connection section of the first DC voltage terminal element or of the first DC voltage connection element is located opposite an associated surface welding section and is accessible to an external welding device;

b. forming the first connection by welding the first DC voltage connection element to the first DC voltage terminal element;

c. arranging a surface connection section of the second DC voltage connection element on an associated surface connection section of the second DC voltage terminal element; and

d. forming the second connection by welding the second DC voltage connection element to the second DC voltage terminal element on a second surface welding section.

10. The method according to claim 9 , wherein:

during the step (a) the DC voltage terminal elements or the DC voltage connection element are arranged a distance apart in the region of their respective surface connection sections and are at an angle relative to each other.

11. The method according to claim 10 , wherein:

in step c), the second DC voltage terminal element or the second DC voltage connection element is bent in a bending region.

12. The method according to claim 11 , wherein:

in the step d) the respective welding is a laser welding process.