DE102018215522A1 - DC link capacitor for a power electronics arrangement and power electronics arrangement with the DC link capacitor - Google Patents

Abstract

The power electronics in the automotive sector are very dependent on the geometry of the intermediate circuit capacitor with regard to installation space and packaging, since this is usually the largest independent component. For this purpose, an intermediate circuit capacitor 2 is used for a power electronics arrangement 1 with a first and a second busbar 7, with at least one insulation layer 18 for electrical insulation of the two busbars 7, 8, the insulation layer 7, 8 being arranged between the two busbars 7, 8 and the two busbars 7, 8 lying flat over one another via the insulation layer 18, with a first and a second contact section 5, 6 for electrically contacting a supply device 3, the first contact section (5) being electrically conductively connected to the first busbar 7 and the second contact section 6 to the second busbar 8, the first contact section 5 being bolt-shaped and the second contact sections 6 is sleeve-shaped, the first contact section 5 being arranged coaxially and / or concentrically in the second contact section 6.

Description

The invention relates to an intermediate circuit capacitor with the features of the preamble of claim 1. Furthermore, the invention relates to a power electronics arrangement with the intermediate circuit capacitor.

The power electronics in the automotive sector are very dependent on the geometry of the DC link capacitor in terms of installation space and packaging, since this is usually the largest independent component. Such an intermediate circuit capacitor usually has a positive pole and a negative pole rail, which are arranged one above the other in an electrically insulating manner, for example a power module and / or a battery being connected to the capacitor via the two busbars.

The publication DE 42 22 068 C1 , which probably forms the closest prior art, discloses an output capacitor arrangement of a switched-mode power supply which has at least two electrically connected individual capacitors and a solid negative pole metal rail and a positive pole metal rail which is electrically insulated from it for direct current guidance. The individual capacitors are arranged on a substrate which consists of a superposition of a positive pole metal foil, an insulating foil and a negative pole metal foil. To implement the capacitor parallel connection, the plus poles of the capacitors are each connected to the plus pole foil and the minus poles of the capacitors are each electrically conductively connected to the minus pole foil. In the input and / or in the output area of the output capacitor arrangement, the negative pole metal rail is electrically conductively connected to the negative pole metal foil and the positive pole metal rail is connected to the positive pole metal foil.

The invention has for its object to provide an intermediate circuit capacitor of the type mentioned, which is characterized by a compact design.

This object is achieved according to the invention by an intermediate circuit capacitor with the features of claim 1 and by a power electronics arrangement with the features of claim 13. Advantageous refinements result from the subclaims, the drawings and / or the description.

The invention relates to an intermediate circuit capacitor which is designed and / or suitable for a power electronics arrangement. In particular, the intermediate circuit capacitor is designed and / or suitable for an inverter, preferably an intermediate circuit of the inverter.

The intermediate circuit capacitor has a first and a second busbar. The two busbars are preferably arranged parallel to one another, the first and second busbars preferably each extending in a separate plane. In particular, the first and / or the second busbar are designed as a plate-shaped or strip-shaped or band-shaped conductor plate. In principle, the first busbar can be designed as a positive pole and the second busbar as a negative pole. Alternatively, however, the second busbar can also be designed as the positive pole and the first busbar as the negative pole. The intermediate circuit capacitor can have a plurality of individual capacitors, the individual capacitors preferably being arranged on at least or exactly one of the two busbars. For example, the individual capacitors can be designed as film capacitors.

The intermediate circuit capacitor has at least or exactly one insulation layer which is designed and / or suitable for the electrical insulation of the two busbars. In principle, the insulation layer can be formed by an air gap between the two busbars. However, the insulation layer is preferably formed by one or more insulation material (s). The insulation layer can be formed as a plastic and / or ceramic layer. The insulation layer is particularly preferably formed by an insulation film, in particular a plastic film. In particular, the intermediate circuit capacitor has a further insulation layer, the further insulation layer preferably being arranged on a surface of the first or the second busbar which forms an outside.

The insulation layer is arranged between the two busbars, the two busbars lying flat over the insulation layer one above the other. In particular, the insulation layer extends over the entire area between the two busbars. The two busbars are preferably electrically insulated from one another via the insulation layer. The two busbars are particularly preferably arranged closely adjacent to one another via the insulation layer. Here, “closely adjacent” is to be understood as a very small distance between the two busbars, while at the same time electrical insulation is ensured by the insulation layer.

The intermediate circuit capacitor has a first and a second contact section, which is used for electrical contacting Supply device is designed and / or suitable. The supply device is preferably used to store and / or provide electrical energy. In particular, the supply device is designed as a voltage source, in particular as an accumulator or a battery. The first contact section is electrically conductively connected to the first busbar and the second contact section is connected to the second busbar. The first contact section is preferably connected to the first busbar in accordance with the polarity and the second contact section is connected to the second busbar in accordance with the polarity. A DC connection is particularly preferably implemented by the two contact sections. The two contact sections can be closely adjacent to one another and / or electrically isolated from one another. The two contact sections particularly preferably extend perpendicularly to the plane of the first and / or second busbar, in particular an angle of 90 degrees with an angular deviation of +/- 5 degrees.

It is proposed within the scope of the invention that the first contact section is of bolt-shaped design and the second contact section is of sleeve-shaped design. In particular, the first contact section is designed in a rough shape as a cylinder bolt and the second contact section in a rough form as a cylinder sleeve. The first and / or the second contact section preferably have a connection contact, which is preferably designed and / or suitable for connecting the supply device. The connection contact is preferably designed as a radially outwardly directed wing or web or flange. As an alternative, the connection contact is designed as an axially elongated tab for a clamp connection. The connection contact preferably adjoins at the end on an outer circumference of the respective contact section. The first contact section is arranged at least in sections coaxially and / or concentrically in the second contact section. In particular, one of the two contact sections defines a main axis with its longitudinal axis, the two contact sections being arranged coaxially with respect to the main axis.

The advantage of the invention is that the design according to the invention forms a significantly more compact connection of the intermediate circuit capacitor, as a result of which installation space in the connection area can be saved. Furthermore, the coaxial arrangement of the two contact sections, which are preferably located within a housing of the intermediate circuit capacitor, makes it much easier to implement a cooling connection, at the same time ensuring a low-inductance intermediate circuit connection. In addition, new packaging variants are possible with regard to arrangement and basic placement in the OEM installation space. Another advantage is in particular that the inventive design of the two contact sections means that other components, such as the power supply of the supply device, cooling and / or support structures are predefined.

In a preferred embodiment it is provided that the first and / or the second contact section are formed as a separate component and are connected in an electrically conductive manner to the associated busbar via a plug connection. In particular, the first and / or the second contact section are positively and / or non-positively and / or integrally connected and / or connectable to the associated busbar. In particular, the plug connection can be used to implement a releasable connection of the two contact sections to the respective busbar. When the two contact sections are assembled, the sleeve-shaped contact section is preferably connected to the associated busbar via the plug connection in a first assembly step. The bolt-shaped contact section is then inserted in the axial direction with respect to the main axis into the sleeve-shaped contact section and connected to the associated busbar via the plug connection.

In a specific implementation, it is provided that the first busbar has a first contact opening for receiving the first contact section and the second busbar has a second contact opening for receiving the second contact section. The first and / or the second contact opening are preferably designed as an opening or a bore.

The two contact openings are arranged coaxially, in particular with respect to the main axis, with the first contact opening having a smaller opening diameter than the second contact opening. In particular, the first busbar is partially uncovered through the second contact opening. The area uncovered by the second contact opening is preferably designed as an annular surface. The circular ring surface can preferably be completely covered by the insulation layer.

The first contact section is inserted into the first contact opening for electrical contacting of the first busbar via the second contact opening and the second contact section is inserted into the second contact opening for electrical contacting of the second busbar, so that the plug connection is formed. In particular, the sleeve-shaped contact section is supported on the first busbar in the axial direction with respect to the main axis via the insulation layer. In the radial direction, the sleeve-shaped contact section can contact the second busbar at least in sections with its outer circumference. In particular, the bolt-shaped contact section has a stepped end at the end, via which the bolt-shaped contact section is inserted and / or can be inserted into the associated contact opening. The insulation layer can preferably be left free and / or interrupted in the region of the first contact opening, so that the first contact section can be inserted into the first contact opening unhindered. The first contact section is particularly preferably arranged at a distance from the second busbar in the region of the second contact opening.

In a preferred development it is provided that the intermediate circuit capacitor has a sleeve-shaped insulation component for the electrical insulation of the two contact sections. The insulation component is preferably made of an electrically insulating material. Optionally, in addition, the insulation component can have heat-conducting properties. The insulation component can be designed as an injection molded component, in particular a plastic injection molded component. Manufacture as a milled part or by means of 3D printing is also possible.

The sleeve-shaped insulation component is arranged, in particular with respect to the main axis, coaxially and / or concentrically between the two contact sections. The insulation component is particularly preferably arranged in a radial manner with respect to the main axis between the two contact sections. In particular, the two contact sections are arranged closely spaced apart from one another via the insulation component. Preferably, the two contact sections can lie flat against one another via the insulation component. In the assembly method, the insulation component can be inserted into the sleeve-shaped contact section in the axial direction with respect to the main axis in a second assembly step, the bolt-shaped contact section being inserted into the insulation component in the further assembly step. Alternatively, the two contact sections are in each case encapsulated in a heat-conductive manner or cast in a heat-conductive manner. This advantageously eliminates the need to use the insulation component.

In a further embodiment it is provided that the insulation component bears in an electrically insulating manner on the insulation layer. The insulation component preferably lies against the insulation layer within the annular surface of the first busbar. The insulation component is particularly preferably supported in the axial direction with respect to the main axis via the insulation layer on the first busbar. In particular, the bolt-shaped contact section is supported at least in sections in the axial direction with respect to the main axis on the sleeve-shaped contact section and / or the first busbar via the insulation component.

In a further preferred development of the invention, the intermediate circuit capacitor has a cooling insert which is designed and / or suitable for cooling the two contact sections. In particular, liquid cooling, in particular water cooling, is implemented by the cooling insert. The cooling insert is particularly preferably made from a heat-conducting material. Optionally, in addition, the cooling insert can have electrically insulating properties. The cooling insert can be designed as an injection molded component, in particular a plastic injection molded component.

The cooling insert, in particular with respect to the main axis, is arranged coaxially and / or concentrically with the two contact sections and thermally coupled to at least or exactly one of the two contact sections. The cooling insert can be accommodated in the second contact opening at least in sections. In particular, the cooling insert is supported in the axial direction with respect to the main axis on the first and / or the second busbar. In particular, the cooling insert can be held captive in the axial direction on the one hand by the first and / or the second busbar and on the other hand by the first and / or the second contact section and / or the insulation component.

In a concrete constructive implementation, the cooling insert is designed as a cooling jacket. The cooling insert is preferably designed as a hollow cylindrical cooling jacket. The cooling jacket sheaths the two contact sections, the sleeve-shaped contact section abutting on an inner jacket surface of the cooling jacket in a heat-conducting manner. In particular, the first and / or the second contact sections and / or the insulation component are received in a form-fitting manner in a central bore of the cooling jacket. The two contact sections are particularly preferably thermally coupled to one another via the insulation component, so that heat transfer between the two contact sections and the cooling insert is implemented by heat conduction. The cooling jacket can preferably be recessed at least in sections, so that the second busbar can make electrical contact with the second contact section.

In a further constructive implementation it is provided that the cooling insert has a coolant connection. In particular, the coolant connection has at least a first and a second connection piece. The first connection piece can preferably be a flow connection piece and the second connecting piece be a return pipe. The two connecting pieces are preferably rectified in the axial direction with respect to the main axis. The two connecting pieces are preferably arranged at a distance from one another in the radial direction with respect to the main axis. In particular, the cooling insert can be connected to a coolant supply in a fluid-conducting manner via the coolant connection.

The first and / or the second busbar have at least or exactly one connection leadthrough, the coolant connection being guided through the connection leadthrough in an electrically insulating manner. In particular, the connection leadthrough can be partially formed by the first and / or the second contact opening. Alternatively or optionally additionally, a separate connection opening for forming the connection lead-through is assigned to each of the two connection pieces. The connection openings can each be designed as an opening or a bore. The connection openings are preferably made in the first and / or the second busbar. A guide sleeve, which serves to guide the coolant connection and to maintain the air and creepage distances between the two potentials, is particularly preferably arranged in the connection leadthrough. The creepage distance is preferably 8 mm, the clearance is preferably 4 mm. Ultimately, the clearances and creepage distances are largely determined by the specific application.

In particular, the coolant connection is electrically insulated from the first and / or the second busbar by the guide sleeve. A separate guide sleeve is particularly preferably assigned to each of the connection openings, with in particular the first and the second connection stub being guided through the associated connection opening in an electrically insulating manner via the associated guide sleeve.

In a further implementation it can be provided that the cooling insert has a cooling connection interface for a further cooling insert of power electronics, wherein a coolant supply to the power electronics can be implemented via the cooling insert of the intermediate circuit condenser. In particular, the power electronics have a further cooling insert, wherein the further cooling insert can be fluidly coupled to the cooling insert of the intermediate circuit condenser via the cooling connection interface. The two cooling inserts are preferably fed via a common coolant supply.

In a further preferred development, it is provided that the intermediate circuit capacitor has a shielding component which is designed and / or suitable for electromagnetic shielding of the two contact sections. In particular, the shielding component is designed as an EMC filter. The shielding component can have an iron core or other suitable core or can be designed as this. The shielding component is arranged coaxially and / or concentrically with the two contact sections, in particular with respect to the main axis. The two contact sections are preferably completely enclosed at least in the circumferential direction by the shielding component.

In a concrete constructive implementation it is provided that the shielding component is designed as a cylinder sleeve, the cylinder sleeve encasing at least or exactly the two contact sections and / or the cooling insert. The cylinder sleeve can have a round or rectangular or oval shape. In principle, the sleeve-shaped contact section can rest directly on the cylinder sleeve. However, the cooling jacket preferably lies with its outer jacket surface on an inner circumference of the cylinder sleeve. In particular, the first and / or the second contact section and / or the insulation component and / or the cooling insert are arranged in a form-fitting manner in the cylinder sleeve. The two contact sections, the insulation component, the cooling insert and / or the shielding component can particularly preferably be combined with one another as desired. The components can be matched to one another in terms of their cross-sectional size and their pairing.

The invention is based on the knowledge that the intermediate circuit capacitor is usually defined relatively late by the interfaces of the supply device (battery) and the power electronics (power module (s)), which often results in very complex busbars. Since cooling via the busbars is most effective, the busbar must be thermally connected. In addition, appropriate EMC requirements must be taken into account, particularly in the case of higher performance classes, in order to ensure trouble-free operation.

So far, the intermediate circuit capacitor, the cooling insert and the shielding component have been combined with one another in a complex manner, whereby the assembly is often complex and the cooling is heavily dependent on the sealing compound material of the capacitor and is rarely ideal. In addition, the windings of the film capacitor are often additionally cooled. Thermally conductive materials such as “gap pads”, “gap filler” are required to bind them effectively. The disadvantage here is that a relatively high surface pressure is often required for relatively large surfaces or that a relatively large amount of filler material is required, in addition to the design must be taken into account and has an impact on costs.

With the present invention, the points listed above can be greatly simplified or are integrated or are no longer necessary. The shielding component (EMC filter) and the cooling insert (busbar cooling) are geometrically compressed and thus save additional components, e.g. Screws; Installation space; Weight and cost. At the same time, this enables a higher power density. Thus, a perfectly matched intermediate circuit capacitor is proposed, which is characterized by simple mounting with integrated EMC shielding and cooling or cooling connection to the outside or to the environment. The manufacturing costs and the design effort for the entire power electronics are reduced. At the same time, the DC interface (first and second contact section) is also fixed to the outside of the supply device and is therefore easily accessible. Furthermore, the system is significantly less susceptible to vibrations than previous solutions, since the essential components are integrated in the capacitor housing.

In a further implementation it is provided that the intermediate circuit capacitor has a capacitor housing with a receiving section. In particular, the individual capacitors are arranged within the capacitor housing and shielded from the environment. The capacitor housing is preferably arranged and / or fastened on one of the two busbars. In particular, the receiving section is designed as an opening, which has a similar geometric shape as the shielding component and / or the cooling insert and / or the sleeve-shaped contact section. The two contact sections and / or the cooling insert and / or the shielding component are arranged, in particular with respect to the main axis, coaxially and / or concentrically to one another in the receiving section. In particular, the contact connections of the two contact sections are arranged exposed in the receiving section. Subsequent casting or covering is also possible and preferred.

Another object of the invention relates to a power electronics arrangement with the intermediate circuit capacitor as described above or according to one of the preceding claims. The power electronics arrangement is used in particular to control and / or to supply an electrical machine. The electrical machine can be designed and / or suitable as a main or auxiliary drive, in particular for a vehicle.

The power electronics arrangement has at least or exactly one power module and at least or exactly the supply device. The intermediate circuit capacitor and the power module are particularly preferably of modular design, so that, for example, several of the power modules and / or intermediate circuit capacitors can be coupled with one another and / or can be interchanged with one another. The power module is electrically conductively connected to the intermediate circuit capacitor via the two contact rails and the supply device via the two contact sections. The power module and / or the intermediate circuit capacitor can be designed as a frame module or a mold module.

• 1 in einer schematischen Darstellung eine Leistungselektronikanordnung mit einem Zwischenkreiskondensator als ein Ausführungsbeispiel der Erfindung;
• 2 in einer Explosionsdarstellung den Zwischenkreiskondensator aus 1;
• 3 in einer Schnittdarstellung eine Detailansicht des Zwischenkreiskondensators aus 2.

Further features, advantages and effects of the invention result from the following description of preferred exemplary embodiments of the invention. Show:

• 1 a schematic representation of a power electronics arrangement with an intermediate circuit capacitor as an embodiment of the invention;
• 2nd in an exploded view the intermediate circuit capacitor 1 ;
• 3rd in a sectional view a detailed view of the intermediate circuit capacitor 2nd .

1 shows a schematic representation of a power electronics arrangement 1 , which is designed and / or suitable for example for controlling and / or for supplying an electric motor of a vehicle. The power electronics assembly 1 has an intermediate circuit capacitor 2nd as well as a supply facility 3rd and several power modules 4th , which are only indicated schematically.

The intermediate circuit capacitor 1 has a first and a second contact section 5 , 6 on, with one of the two contact sections 5 , 6 as a positive pole and the other of the two contact sections 5 , 6 is designed as a negative pole. The utilities 3rd is polarity correct over the two contact sections 5 , 6 with the intermediate circuit capacitor 2nd electrically connected. For example, the supply facility 3rd designed as a high-voltage battery.

The intermediate circuit capacitor 2nd has a first and a second busbar 7 , 8th on, the first contact portion 5 polarity-correct with the first busbar 7 and the second contact section 6 polarity-appropriate with the second busbar 8th is electrically connected. The two busbars 7 , 8th are each designed as a plate-shaped printed circuit board, wherein at least one of the two busbars 7 , 8th for connecting the power modules in sections from a capacitor housing 9 protrudes so that several capacitor connecting conductors 10th for connecting one power module each 4th are formed. There is one of the power modules 4th via one of the capacitor connection conductors 10th with the intermediate circuit capacitor 2nd electrically connected.

2nd shows the intermediate circuit capacitor in an exploded view 2nd from the 1 . The two busbars 7 , 8th are arranged one above the other in an electrically insulating manner and can be designed, for example, as copper baffles. The capacitor housing 9 is on the second track above 8th arranged or assembled. An arrangement or assembly on the busbar located below would also be conceivable 7 . For example, the intermediate circuit capacitor 2nd have a plurality of individual capacitors, which within the capacitor housing 9 are arranged and for example with the first and / or the second busbar 7 , 8th electrical contact.

The first contact section 5 is bolt-shaped and the second contact section 6 sleeve-shaped, the first contact section 5 with respect to a major axis H coaxially within the second contact section 6 is arranged or can be arranged. The intermediate circuit capacitor 2nd has a sleeve-shaped insulation component 10th on, the first contact portion 5 over the sleeve-shaped insulation component 10th form-fitting in the second contact section 6 is recorded. The insulation component 10th is coaxial to the main axis H arranged and used for electrical insulation of the first contact section 5 opposite the second contact section 6 . The two contact sections 5 , 6 are closely adjacent to one another via the insulation component 10th spaced so that a low-inductance DC connection is implemented. The two contact sections 5 , 6 are each via a plug connection to the respective busbar 7 , 8th connected.

The two contact sections 5 , 6 each have a wing-shaped connection contact 11 for electrical contacting of the supply device 3rd on, the two connection contacts 11 each with respect to the main axis H are directed radially opposite to each other outwards. The insulation component 10th has at least approximately a similar shape to the bolt-shaped contact section 5 on, the connection contact 11 of the first contact section 5 through the insulation component 10th opposite the second contact section 6 is isolated.

Furthermore, the intermediate circuit capacitor 2nd a cooling insert 12th on, with the cooling insert 12th is designed as a cooling jacket. The cooling insert 12th is in relation to the major axis H arranged coaxially, the two contact sections 5 , 6 as well as the insulation component 7 inside the cooling jacket 12th are arranged positively. The second contact section is located here 6 on an inner surface of the cooling insert 12th on, the second contact portion 6 with the cooling insert 12th is thermally coupled. For example, the insulation component 10th made of a thermally conductive material so that heat transfer from the first contact section 5 over the insulation component 10th on the second contact section 6 can be done.

The cooling insert 12th has a coolant connection 13 which is used to connect a coolant supply. For example, through the cooling insert 12th implemented a liquid cooling. The coolant connection 13 has a first and a second connecting piece for this purpose 13a , b on, with the two connecting pieces 13a , b through the two busbars 7 , 8th passed and electrically insulated from them. The two connecting pieces 13a , b protrude from the capacitor housing 9 out so the coolant port 13 for connecting the coolant supply is freely accessible. For example, the entire cooling insert 12th be made of an electrically insulating material, such as plastic.

The intermediate circuit capacitor 2nd has a shielding component 14 for electromagnetic shielding of the two contact sections 5 , 6 on. The shielding component 14 is designed as a cylinder sleeve and coaxial to the main axis H arranged. The cooling insert 12th is through the cylinder sleeve 14 completely encased in the circumferential direction. The shielding component can 14 on an outer surface of the cooling insert 12th issue. For example, the shielding component 14 formed as an iron core.

The capacitor housing 9 has a receiving portion 15 on, the receiving portion 15 as one in relation to the major axis H coaxial breakthrough is formed. The shielding component 14 , the cooling insert 12th , the two contact sections 5 , 6 as well as the insulation component 10th are in the radial direction with respect to the main axis H form-fitting in the receiving section 15 arranged so that they are geometrically compressed and a compact arrangement is implemented. The two connection contacts 11 through the receiving section 15 uncovered so that it can be used to connect the utility 3rd are easily accessible.

In an assembly process, the cooling insert is first 12th on the two busbars 7 , 8th put on. Then the second contact section 11 , the insulation component 10th and the first contact section 5 in the axial direction with respect to the main axis H one after the other in the bore of the cooling insert 12th inserted, the first contact section 5 in the first track 5 and the second contact section 11 in the second conductor rail 12th is inserted in an electrically conductive manner. In a further assembly step, the shielding component 14 in the axial direction with respect to the main axis H about the cooling insert 12th pushed. Finally, the capacitor housing 9 on the two busbars 7 , 8th or the second track above 8th be put on.

3rd shows in a sectional view a detailed view of the intermediate circuit capacitor 2nd with the cooling insert 12th . The first track 7 has a first contact opening 16 and the second track 8th a second contact opening 17th on, with the two contact openings 16 , 17th coaxial with respect to the major axis H are arranged to each other. The first contact opening has 17th a smaller opening diameter than the second contact opening 17th on, causing the first power rail 7 inside the second contact opening 18th is partially exposed.

Between the two busbars 7 , 8th is an insulation layer 18th arranged, the two busbars 7 , 8th through the insulation layer 18th are arranged closely adjacent to one another and at the same time are electrically insulated from one another. This is through the second contact opening 17th uncovered area of the first busbar 7 completely through the insulation layer 18th covered. Another layer of insulation 19th is on the back of the first track 7 provided, which in particular an outside of the intermediate circuit capacitor 2nd forms. For example, the two insulation layers 18th , 19th each formed as a plastic film.

The cooling insert 12th can at least in sections in the second contact opening 17th be included, with the cooling insert 12th in the axial direction with respect to the main axis H over the insulation layer 18th on the first track 7 supports. Furthermore, the cooling insert 12th additionally in the axial direction with respect to the main axis H in an edge area on the second busbar 8th support. The cooling insert 12th can be a recess 20th have, the second busbar 8th over the recess 20th with the second contact section 6 , out 2nd , contacted. In particular, the second busbar protrudes 8th over the recess 20th radially into the bore of the cooling jacket 12th , so the second track 8th the second contact section 6 can contact on its outer circumference.

For electrical contacting of the second contact section 6 with the second track 8th , the second contact section 6 about the cooling insert 12th into the second contact opening 17th plugged in. The second contact section is supported 6 in the axial direction with respect to the main axis H over the insulation layer 18th on the first track 7 from. Then the insulation section 10th together with the first contact section 5 , as in 2nd shown, in the sleeve-shaped second contact section 6 inserted, the first contact section 5 for electrical contacting of the first busbar 7 through the second contact opening 17th the second track above 8th into the first contact opening 16 is inserted. The first contact section is supported 5 in the axial direction with respect to the main axis H over the insulation component 10th and the insulation layer 18th on the first track 7 from.

The two busbars 7 , 8th have a connection 21 on which to carry out the coolant connection 13 through the two busbars 7 , 8th serves. This is the second contact opening 17th dimensioned so that the two connecting pieces 13a , b through the first track 8th can be performed. The first track 21 has two connection openings 22 on, each of the connecting pieces 13a , b one of the connection openings 22 assigned. Here are the two connection openings 22 inside the second contact opening 17th arranged, the first contact opening 16 in the middle between the two connection openings 22 is arranged. For example, the two connection openings 22 formed as through holes, the cooling insert 12th with the two connecting pieces 13a , b in the axial direction with respect to the main axis H into the corresponding connection opening 22 is inserted.

The connection implementation 21 points to each connection opening 22 one guide sleeve each 23 on, with the two connecting pieces 13a , b each via the associated guide sleeve 23 in the respective connection opening 22 are managed and / or kept captive. For example, the guide sleeves 23 formed as press-in guide sleeves and can each be pressed into the associated connection opening. The guide sleeves 23 are made of an electrically insulating material, so that the two connecting pieces 13a , b within the connection bushing 21 compared to the first track 7 are electrically isolated. The two layers of insulation 18th , 19th are in the place of the first contact opening 16 and the two connection openings 22 recessed so that the two connecting pieces 13a , b as well as the first Contact section 5 unimpeded into the respective opening 16 , 22 can be inserted.

Reference list

1

Power electronics assembly

2nd

DC link capacitor

3rd

Utilities

4th

Power modules

5

first contact section

6

second contact section

7

first track

8th

second track

9

Capacitor housing

10th

Insulation component

11

Connection contact

12th

Cooling insert

13

Coolant connection

13a, b

Connecting piece

14

Shielding component

15

Receiving section

16

first contact opening

17th

second contact opening

18th

Insulation layer

19th

further insulation layer

20th

Recess

21

Connection implementation

22

Connection opening

23

Guide sleeve

H

Main axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 4222068 C1 [0003]

Claims (13)

DC link capacitor (2) for a power electronics arrangement (1) with a first and a second busbar (7, 8), with at least one insulation layer (18) for the electrical insulation of the two busbars (7, 8), the insulation layer (7, 8) is arranged between the two busbars (7, 8) and the two busbars (7, 8) lie flat one above the other via the insulation layer (18), with a first and a second contact section (5, 6) for electrical contacting of a supply device (3) , wherein the first contact section (5) is electrically conductively connected to the first busbar (7) and the second contact section (6) to the second busbar (8), characterized in that the first contact section (5) is bolt-shaped and the second contact section ( 6) is sleeve-shaped, the first contact section (5) being arranged coaxially and / or concentrically in the second contact section (6). DC link capacitor (2) after Claim 1 , characterized in that the first and / or the second contact section (5, 6) are designed as a separate component and are electrically conductively connected to the associated busbar (7, 8) via a plug connection. DC link capacitor (2) after Claim 2 , characterized in that the first busbar (7) has a first contact opening (16) for receiving the first contact section (5) and the second busbar (8) has a second contact opening (17) for receiving the second contact section (6), the The two contact openings (16, 17) are arranged coaxially to one another, the first contact opening (16) having a smaller opening diameter than the second contact opening (17), and the first contact section (5) for electrically contacting the first busbar (7) via the second contact opening (17) is inserted into the first contact opening (16) and the second contact section (6) for electrical contacting of the second busbar (8) is inserted into the second contact opening (17), so that the plug connection is formed. Intermediate circuit capacitor (2) according to one of the preceding claims, characterized in that the intermediate circuit capacitor (2) has a sleeve-shaped insulation component (10) for electrical insulation of the two contact sections (5, 6), the insulation component (10) coaxially and / or concentrically between the two contact sections (5, 6) is arranged. DC link capacitor (2) after Claim 4 , characterized in that the insulation component (10) is supported on the first busbar (7) via the insulation layer (18). Intermediate circuit capacitor (2) according to one of the preceding claims, characterized in that the intermediate circuit capacitor (2) has a cooling insert (12) for cooling the two contact sections (5, 6), the cooling insert (12) being coaxial and / or concentric with the two Contact sections (5, 6) is arranged and thermally coupled to at least one of the two contact sections (5, 6). DC link capacitor (2) after Claim 6 characterized in that the cooling insert (12) is designed as a cooling jacket, the two contact sections (5, 6) being encased by the cooling insert (12), and the second sleeve-shaped contact section (6) on an inner lateral surface of the cooling insert (12) is heat-conductive. DC link capacitor (2) after Claim 6 or 7 characterized in that the cooling insert (12) has a coolant connection (13), the first and / or the second busbars (7, 8) having a connection leadthrough (21), the coolant connection (13) through the connection leadthrough (21) is performed electrically insulating. DC link capacitor (2) after Claim 6 or 7 , characterized in that the cooling insert (12) has a cooling connection interface for a further cooling insert of power electronics, wherein a coolant supply to the power electronics can be implemented via the cooling insert (12) of the intermediate circuit capacitor (2). Intermediate circuit capacitor (2) according to one of the preceding claims, characterized in that the intermediate circuit capacitor (2) has a shielding component (14) for electromagnetic shielding of the two contact sections (5, 6), the shielding component (14) being coaxial and / or concentric with the two contact sections (5, 6) is arranged. DC link capacitor after Claim 9 , characterized in that the shielding component is designed as a cylinder sleeve, the cylinder sleeve encasing at least the two contact sections and / or the cooling insert. Intermediate circuit capacitor (2) according to one of the preceding claims, characterized in that the intermediate circuit capacitor (2) has a capacitor housing (9) with a receiving section (15), at least the two Contact sections (5, 6) and / or the cooling insert (12) and / or the shielding component (14) are arranged coaxially and / or concentrically to one another in the receiving section (15). Power electronics arrangement (1) with the intermediate circuit capacitor (2), characterized in that the power electronics arrangement (1) has at least one power module (4) and at least one supply device (3), the power module (4) via the two busbars (7, 8) and the supply device (3) is electrically conductively connected to the intermediate circuit capacitor (3) via the two contact sections (5, 6).

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