Intermediate circuit capacitor for power electronic assembly

Abstract

The invention relates to an intermediate circuit capacitor for a power electronic assembly, comprising: at least one capacitor element which is designed to store an electrical charge in an electric field; a first distribution element having a first transistor connection, a first battery connection and a first contact plate, the first contact plate electrically contacting the capacitor element on a first side; and a second distribution element having a second transistor connection, a second battery connection and a second contact plate, the second contact plate electrically contacting the capacitor element on a second side, the first contact plate and the second contact plate being oriented parallel to each other, the first contact plate being arranged in the first side, and the second contact plate being arranged in the second side. The first battery terminal is connected to the first contact plate by means of a first connection section.

Description

Technical Field

[0001] This invention relates to an intermediate circuit capacitor for power electronic components. Another aspect of the invention relates to an electric vehicle having power electronic components, said power electronic components including an intermediate circuit capacitor. Background Technology

[0002] Intermediate circuit capacitors can be used in electric vehicles to reduce ripple in the current between the battery cell and the power semiconductors and achieve suppression effects. Preferably, the intermediate circuit capacitor transmits high frequencies with low impedance with high electromagnetic compatibility. The high current and voltage transmitted can cause significant heating of the intermediate circuit capacitor, which can lead to aging. To achieve long-term and reliable operation of the intermediate circuit capacitor, it is important to avoid excessive heating. Furthermore, the connection of the intermediate circuit capacitor to multiple power semiconductors may impose higher requirements on electromagnetic compatibility to avoid interfering with adjacent devices. It is desirable to have intermediate circuit capacitors for power electronic components that are simple to manufacture and generate as little heat and as little disruptive electromagnetic radiation as possible. Summary of the Invention

[0003] The intermediate circuit capacitor according to the invention, having the features of claim 1, has the advantage of reducing heat generation through effective current guidance. Furthermore, the electromagnetic compatibility of the intermediate circuit capacitor can be improved through the arrangement of the first and second distribution elements according to the invention. This is achieved according to the invention by the following: the intermediate circuit capacitor includes at least one capacitor element capable of storing charge using an electric field. Furthermore, the intermediate circuit capacitor includes a first distribution element having a first transistor terminal, a first battery terminal, and a first contact plate. Here, the first contact plate electrically contacts the capacitor element on one side. Furthermore, the intermediate circuit capacitor includes a second distribution element having a second transistor terminal, a second battery terminal, and a second contact plate, wherein the second contact plate electrically contacts the capacitor element on a second side. The first and second contact plates are oriented parallel to each other. The first battery terminal is connected to the first contact plate by means of a first connecting section. The second battery terminal is connected to the second contact plate by means of a second connecting section. Here, the first connecting section has a first overlapping area, which is coplanar with the first contact plate and overlaps with a second overlapping area of ​​the second connecting section, the second overlapping area being coplanar with the second contact plate. By arranging the first contact plate, the second contact plate, the first overlapping region, and the second overlapping region in parallel overlap, the negative impact of the proximity effect can be reduced, and the intermediate circuit capacitor can achieve better conduction capability for high-frequency current. Furthermore, the arrangement according to the invention can improve the electromagnetic compatibility of the intermediate circuit capacitor. "First and second transistor terminals" refers to electrical terminals configured to contact transistors, particularly power semiconductors. "First battery terminal" refers to an electrical terminal capable of electrically contacting a battery cell, particularly by means of a busbar. The first and second distribution elements are electrically insulated from each other to conduct different potentials. "Arrangement of overlapping regions" refers to an arrangement in which the first and second overlapping regions at least partially overlap perpendicular to the first contact plate.

[0004] The first overlapping area and the second overlapping area are preferably arranged to be completely overlapping.

[0005] Preferably, the intermediate circuit capacitor has a plurality of capacitor elements arranged in parallel side by side, the capacitor elements being arranged between and in electrical contact with the first and second contact plates.

[0006] The first and second distributing elements are preferably manufactured as a single unit.

[0007] Cooling elements are preferably mounted on the first and / or second contact plates to dissipate heat from the intermediate circuit capacitor.

[0008] The dependent claims illustrate preferred extensions of the invention.

[0009] Preferably, the first and second battery terminals are arranged parallel to each other. This allows for simple battery contact to be achieved using the battery terminals.

[0010] Further preferably, the first battery connector and the second battery connector are arranged on a common plane. This further improves the contactability between the intermediate circuit capacitor and the battery.

[0011] The first overlapping area is preferably centrally located on one side of the first contact plate, and the second overlapping area is also centrally located on one side of the second contact plate. Specifically, the first and second overlapping areas are positioned between the first and second battery terminals. This allows for symmetrical current guidance with minimal transmission resistance.

[0012] The first and / or second overlapping areas are preferably constructed into the first and / or second contact plates through two cuts. This enables simple manufacturability of the first and / or second overlapping areas. The cuts in the first and second dispensing elements are preferably located on a common plane perpendicular to the first and second contact plates.

[0013] The capacitor element of the intermediate circuit capacitor is preferably a capacitor winding, especially for PP film capacitors. The capacitor winding can reliably store charge in an electric field. The axis of rotation of the capacitor winding is preferably arranged perpendicular to the first contact plate and perpendicular to the second contact plate. This allows the capacitor winding to contact in a planar manner, thereby reliably dissipating heat through the first contact plate and / or the second contact plate and the cooler disposed thereon.

[0014] The first contact plate and / or the second contact plate preferably have contact tabs that can be electrically connected to the capacitor element. The contact tabs are manufactured simply and inexpensively through a simple stamping process and can achieve simple contact of the capacitor element, especially by means of resistance welding.

[0015] Particularly preferred is that the first and / or second distribution elements are stamped and bent pieces, particularly from copper plates. This enables the simple and cost-effective manufacturability of the first and / or second distribution elements. Manufacturing them from copper plates reduces the resistance of the first and / or second distribution elements. Alternatively, the first and / or second distribution elements can be manufactured from aluminum plates, which offer good electrical properties while reducing material costs.

[0016] The first transistor connector and / or the first connection section are preferably arranged at least partially perpendicular to the first contact plate. This allows the intermediate circuit capacitor to be shielded, which improves the electromagnetic compatibility of the intermediate circuit capacitor.

[0017] The first distribution element preferably overlaps substantially entirely with the first side of the capacitor element. Similarly, the second distribution element preferably overlaps substantially entirely with the second side of the capacitor element. "Substantially entirely" here means that the first and / or second distribution elements cover an entire side of the capacitor element, wherein the capacitor element is not overlapped by the first and / or second distribution elements, for example, through gaps or cuts for contact tabs. The large contact surfaces between the first and second distribution elements and one or more capacitor elements enable reliable heat dissipation. Furthermore, the large conductor cross-section improves the conductivity of the first and / or second distribution elements.

[0018] Furthermore, the present invention relates to an electric vehicle that includes a power electronic component having the intermediate circuit capacitor described above. Attached Figure Description

[0019] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings:

[0020] Figure 1 A schematic perspective view of an intermediate circuit capacitor according to a preferred embodiment of the invention is shown from the front.

[0021] Figure 2 A schematic perspective view from below of an intermediate circuit capacitor according to a preferred embodiment of the invention is shown. Detailed Implementation

[0022] Preferably, all identical components, elements and / or units are given the same reference numerals in all figures.

[0023] The following reference Figure 1 and 2 The intermediate circuit capacitor 1 according to a preferred embodiment of the present invention will be described in detail.

[0024] Figure 1 An intermediate circuit capacitor 1 is shown, which has a plurality of capacitor elements 2 arranged side by side. The capacitor elements 2 are constructed as capacitor windings for PP film capacitors. Here, the rotation axes of the capacitor elements 2 are arranged parallel to each other. In addition, the intermediate circuit capacitor 1 has a first distribution element 10, which has a first transistor docking portion 11, a first battery terminal 12, and a first contact plate 13. The contact plate 13 makes electrical contact with the capacitor elements 2 on its first surface. For this purpose, contact pieces 4 are provided in the first contact plate 13, which are manufactured by stamping and can be locked with the material of the capacitor elements 2.

[0025] The intermediate circuit capacitor 1 can be connected to the battery via the first battery connector 12. The first battery connector 12 is arranged parallel to the first contact plate 13. Preferably, the first battery connector 12 can be connected to the battery via a busbar. To contact the first battery connector 12, in Figure 1 Two fixing elements 5 are provided, which are shown as contact nuts.

[0026] The first battery connector 12 is connected to the first contact plate 13 by means of a first connecting section 14. The connecting section 14 extends partially perpendicular to the contact plate 13.

[0027] Adjacent to the contact plate 13, the first connection section 14 has a first overlapping area 15, which is arranged coplanarly with the first contact plate 13 and constructed on the first contact plate 13 through two cuts 3. The two cuts 3 in the first contact plate 13 extend parallel to each other along a line.

[0028] Transistor connectors 11 extend from two opposing surfaces of the first contact plate 13, the transistor connectors being configured to electrically contact power semiconductors. The transistor connectors 11 are arranged at least partially perpendicular to the first contact plate 13 and extend adjacent to the capacitor element 2. This improves the electromagnetic compatibility of the intermediate circuit capacitor 1.

[0029] Furthermore, the intermediate circuit capacitor 1 has a second distribution element 20, wherein in Figure 1 The second battery connector 22 is shown. The second battery connector 22 is connected to the second contact plate 23 by means of the second connection section 24 (in Figure 2 (As shown in the diagram). The second battery connector 22 is arranged parallel to the first battery connector 12 in the same plane. Furthermore, the second battery connector 22 has two connecting elements 5 configured as contact nuts for contacting the battery.

[0030] The second connecting section 24 extends at least partially coplanar with the second contact plate 23 and at least partially parallel to the first connecting section 14.

[0031] Figure 2 The intermediate circuit capacitor 1 is shown from the lower side. The second contact plate 23 of the second distribution element 20 is also visible from the lower side, and the second distribution element electrically contacts the capacitor element 2 on its second surface. A second transistor connector 21 is arranged on the second contact plate 23 of the second distribution element 20, and this second transistor connector is configured to contact a power semiconductor element.

[0032] The first distribution element 10 and the second distribution element 20 are electrically insulated from each other. Thus, current can be transferred from the battery to the power semiconductor by means of the first distribution element 10 and the second distribution element 20, wherein the capacitor element 2 can suppress current fluctuations generated by the power semiconductor components.

[0033] The second contact plate 23 also has contact pieces 4 so that the material locks into contact with the capacitor element 2.

[0034] At the transition region from the second connecting section 24 to the second contact plate 23, the second connecting section 24 has a second overlapping region 25, which is constructed by two cuts 3. Here, the second overlapping region 25 is arranged coplanarly with the second contact plate 23. The cuts 3 of the second overlapping region 25 extend along the first and second lines, wherein the first line is arranged perpendicular to the second line.

[0035] The cut 3 of the second overlapping area 25 and the cut 3 of the first overlapping area 15 are on the same plane, wherein the plane is arranged perpendicular to the first contact plate 13 and the second contact plate 23.

[0036] The first overlapping area 15 and the second overlapping area 25 are centrally connected on the common side of the intermediate circuit capacitor. Here, the first overlapping area 15 and the second overlapping area 25 are arranged between the first battery connector 12 and the second battery connector 22.

[0037] This enables symmetrical current flow through the first distribution element 10 and the second distribution element 20 to the capacitor element 2. The parallel overlapping arrangement of the first contact plate 13, the second contact plate 23, the first overlapping area 15, and the second overlapping area 25 enables efficient transmission of low electromagnetic radiation and high-frequency current, thereby reducing the heating of the intermediate circuit capacitor 1.

[0038] The first contact plate 13 and / or the second contact plate 23 are preferably configured as contact coolers to regulate the temperature of the intermediate circuit capacitor 1 and prevent overheating.

Claims

1. An intermediate circuit capacitor for a power electronics assembly, comprising: - at least one capacitor element (2) which is designed to store electrical charge in an electrical field, - a first distribution element (10) which has a first transistor connection (11), a first cell connection (12) and a first contact plate (13), wherein the first contact plate (13) electrically contacts the capacitor element (2) on a first side, and - a second distribution element (20) which has a second transistor connection (21), a second cell connection (22) and a second contact plate (23), wherein the second contact plate (23) electrically contacts the capacitor element (2) on a second side, - wherein the first contact plate (13) and the second contact plate (23) are oriented parallel to one another, - wherein the first cell connection (12) is connected to the first contact plate (13) by means of a first connection section (14), - wherein the second cell connection (22) is connected to the second contact plate (23) by means of a second connection section (24), - wherein the first connection section (14) has a first overlap region (15) which is arranged coplanar to the first contact plate (13) and overlaps a second overlap region (25) of the second connection section (24) which is arranged coplanar to the second contact plate (23).

2. The intermediate circuit capacitor according to claim 1, wherein The first cell connection (12) and the second cell connection (22) are arranged parallel to one another.

3. The intermediate circuit capacitor according to claim 2, wherein The first cell connection (12) and the second cell connection (22) are arranged on a common plane.

4. The intermediate circuit capacitor according to any of the preceding claims, wherein The first overlap region (15) is arranged centrally on one side of the first contact plate (13), and wherein the second overlap region (25) is arranged centrally on one side of the second contact plate (23), in particular between the first cell connection (12) and the second cell connection (22).

5. The intermediate circuit capacitor according to any of the preceding claims, wherein The first overlap region (15) and / or the second overlap region (16) are configured into the first contact plate (13) and / or the second contact plate (23) by two cutouts (3).

6. The intermediate circuit capacitor according to any of the preceding claims, wherein The capacitor element (2) is a capacitor winding, in particular for a PP film capacitor.

7. The intermediate circuit capacitor according to any of the preceding claims, wherein The first contact plate (13) and / or the second contact plate (23) have a contact tab (4) which can be electrically connected to the capacitor element (2).

8. The intermediate circuit capacitor according to any of the preceding claims, wherein The first distribution element (10) and / or the second distribution element (20) are stamped and bent parts, in particular made of copper sheet.

9. The intermediate circuit capacitor according to any of the preceding claims, wherein The first transistor connection (11) and / or the first connection section (14) are arranged at least partially perpendicular to the first contact plate (13).

10. The intermediate circuit capacitor according to any of the preceding claims, wherein The first distribution element (10) overlaps the first side (2) of the capacitor element essentially completely, and / or wherein the second distribution element (20) overlaps the second side of the capacitor element (2) essentially completely.

11. An electric vehicle comprising a power electronics assembly with an intermediate circuit capacitor (1) according to any of the preceding claims.

Images