DC capacitor and vehicle

Abstract

The utility model discloses a DC capacitor and a vehicle, the DC capacitor comprises a core, a first copper bar and a second copper bar, the core has a first surface and a second surface opposite to each other along a first direction, the core also has a first side opposite to a second direction, and the second direction is perpendicular to the first direction. The first copper bar comprises a first input part, a first connecting part and a first output part, the first connecting part is connected with the first surface of the core, the first output part is located on the first side of the core, the second copper bar comprises a second input part, a second connecting part and a second output part, the second connecting part is connected with the second surface of the core, and the second output part is located on the second side of the core. The second output part is located on the first side of the core, and the projection of the first output part and the projection of the second output part are partially overlapped on a projection plane perpendicular to the first direction. The direct current capacitor provided by the utility model is small in stray inductance, ensures that the voltage stress of the power device is within the specification without reducing the turn-off speed of the power device, and meets the use requirements of low loss and high efficiency of the power device.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a direct current capacitor and a vehicle. Background Art

[0002] In the related technology, the DC support capacitor of the electric drive inverter is adapted to the standard HPD (Hybrid PACK Drive, a name for a power device package) package power module interface. The positive and negative copper bars on the output side of the capacitor are generally arranged in parallel and staggered manner, and then the electrical connection with the HPD package power module interface is achieved by locking screws or laser welding. However, the stray inductance of the capacitor using this solution is generally greater than 5nH, which makes the stray inductance of the inverter power circuit usually greater than 15nH. In order to ensure that the voltage stress of the power device is within the specification under high stray inductance, the shutdown speed of the power device is usually reduced, and thus the design goal of low loss and high efficiency cannot be achieved. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model proposes a DC capacitor with small stray inductance, which does not require reducing the turn-off speed of the power device to ensure that the voltage stress of the power device is within the specification, thereby meeting the low-loss and high-efficiency use requirements of the power device.

[0005] An embodiment of the utility model further provides a vehicle.

[0006] The DC capacitor of the embodiment of the utility model comprises a core, a first copper bar and a second copper bar, wherein the core has a first surface and a second surface opposite to each other along a first direction, and the core also has a first side opposite to the second direction, and the second direction is perpendicular to the first direction; the first copper bar comprises a first connecting portion and a first output portion connected to each other, the first connecting portion is connected to the first surface of the core, and the first output portion is located on the first side of the core; the second copper bar comprises a second connecting portion and a second output portion connected to each other, the second connecting portion is connected to the second surface of the core, and the second output portion is located on the first side of the core, and on a projection plane perpendicular to the first direction, the projection of the first output portion and the projection of the second output portion partially overlap.

[0007] According to the DC capacitor of the embodiment of the utility model, the first output portion of the first copper bar and the second output portion of the second copper bar are both located on the first side of the core, and are both used to be electrically connected to the interface of the HPD package power module. At the same time, on the projection plane perpendicular to the first direction, the projection of the first output portion and the projection of the second output portion partially overlap, that is, at least part of the first output portion is opposite to at least part of the second output portion in the first direction. This arrangement effectively reduces the stray inductance caused by the electrical connection between the first output portion and the second output portion and the interface of the HPD package power module, thereby reducing the stray inductance of the entire inverter power circuit, thereby eliminating the need to reduce the shutdown speed of the power device to ensure that the voltage stress of the power device is within the specification, and effectively meeting the low-loss and high-efficiency use requirements of the power device.

[0008] In some embodiments, the first output portion further includes a first mounting portion and a first avoidance hole arranged at intervals, and the second output portion further includes a second mounting portion and a second avoidance hole arranged at intervals, and on a projection plane perpendicular to the first direction, the projection of the first mounting portion coincides with the projection of the second avoidance hole, and the projection of the second mounting portion coincides with the projection of the first avoidance hole.

[0009] In some embodiments, a first screw hole is provided on the first mounting portion, and a second screw hole is provided on the second mounting portion.

[0010] In some embodiments, on a projection plane perpendicular to the first direction, a projection area of ​​the first output portion is S1, a projection area of ​​the second output portion is S2, and an overlapping area of ​​the first output portion and the second output portion is S3, wherein S3 / S1>90%, S3 / S2>90%.

[0011] In some embodiments, the first copper busbar further includes a first bending portion connecting the first connecting portion and the first output portion, and the first bending portion extends from the first connecting portion toward a direction close to the second connecting portion;

[0012] And / or, the second copper busbar further includes a second bending portion connecting the second connecting portion and the second output portion, and the second bending portion extends from the second connecting portion toward a direction approaching the first connecting portion.

[0013] In some embodiments, the first output portion and the second output portion are parallel and both are adjacent to a middle position of the core in the first direction.

[0014] In some embodiments, the extension direction of the first output portion is perpendicular to the first direction, the extension direction of the second output portion is perpendicular to the first direction, and the distance between the first output portion and the second output portion is d, where d≤1 mm.

[0015] In some embodiments, the DC capacitor further includes an insulating layer, the insulating layer is located between the first output portion and the second output portion, and the insulating layer is connected to at least one of the first output portion and the second output portion.

[0016] In some embodiments, the insulating layer includes insulating paper, which is hot-pressed or bonded to the surface of the first output part facing the second output part, and / or the insulating paper is hot-pressed or bonded to the surface of the second output part facing the first output part.

[0017] In some embodiments, the DC capacitor further comprises:

[0018] A housing, the housing having an installation cavity and a first through hole, a second through hole, and a third through hole communicating with the installation cavity, the first copper busbar further comprising a first input portion connected to the first connection portion, the second copper busbar further comprising a second input portion connected to the second connection portion, the core, the first connection portion, and the second connection portion are all arranged in the installation cavity, the first input portion passes through the first through hole and protrudes outside the housing, the second input portion passes through the second through hole and protrudes outside the housing, and the first output portion and the second output portion pass through the third through hole and protrude outside the housing; and

[0019] A glue potting member is disposed in the installation cavity, and the glue potting member is filled between the outer surface of each of the core, the first connecting portion, and the second connecting portion and the inner surface of the installation cavity.

[0020] In some embodiments, the DC capacitor also includes a first sealing ring and a second sealing ring, the first sealing ring is sleeved on the first input part and clamped between the surface of the first input part and the inner surface of the first through hole, and the second sealing ring is sleeved on the second input part and clamped between the surface of the second input part and the inner surface of the second through hole.

[0021] A vehicle according to an embodiment of the present utility model includes a DC capacitor as described in any of the above embodiments.

[0022] The technical advantages of the vehicle according to the embodiment of the utility model are the same as the technical advantages of the DC capacitor of the above-mentioned embodiment, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of a DC capacitor according to an embodiment of the utility model.

[0024] Figure 2 is another schematic diagram of a DC capacitor according to an embodiment of the utility model, wherein the housing is hidden.

[0025] Figure 3 It is a schematic diagram of a core in a DC capacitor according to an embodiment of the utility model.

[0026] Figure 4 It is a schematic diagram of an insulating layer in a DC capacitor according to an embodiment of the utility model.

[0027] Figure 5 This is another schematic diagram of a DC capacitor according to an embodiment of the utility model, wherein the housing is hidden.

[0028] Reference numerals:

[0029] 1. core; 11. first surface; 12. second surface; 2. first copper busbar; 21. first input part; 22. first connection part; 23. first output part; 231. first screw hole; 232. first avoidance hole; 24. first bending part; 3. second copper busbar; 31. second input part; 32. second connection part; 33. second output part; 331. second screw hole; 34. second bending part; 4. insulating layer; 5. shell; 6. first sealing ring; 7. second sealing ring. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0031] Combine the following Figure 1-Figure 5 A DC capacitor according to an embodiment of the present invention is described.

[0032] The DC capacitor of the embodiment of the utility model comprises a core 1, a first copper bar 2 and a second copper bar 3. The core 1 has a first surface 11 and a second surface 12 opposite to each other along a first direction, and the core 1 also has a first side opposite to the second direction, and the second direction is perpendicular to the first direction. The first copper bar 2 comprises a first connecting portion 22 and a first output portion 23 connected to each other, the first connecting portion 22 is connected to the first surface 11 of the core 1, and the first output portion 23 is located on the first side of the core 1. The second copper bar 3 comprises a second connecting portion 32 and a second output portion 33 connected to each other, the second connecting portion 32 is connected to the second surface 12 of the core 1, and the second output portion 33 is located on the first side of the core 1, and on the projection plane perpendicular to the first direction, the projection of the first output portion 23 and the projection of the second output portion 33 partially overlap.

[0033] According to the DC capacitor of the embodiment of the utility model, the first output part 23 of the first copper bar 2 and the second output part 33 of the second copper bar 3 are both located on the first side of the core 1, and are both used to be electrically connected to the interface of the HPD package power module. At the same time, on the projection plane perpendicular to the first direction, the projection of the first output part 23 and the projection of the second output part 33 partially overlap, that is, at least part of the first output part 23 is opposite to at least part of the second output part 33 in the first direction. This arrangement effectively reduces the stray inductance caused by the electrical connection between the first output part 23 and the second output part 33 and the interface of the HPD package power module, thereby eliminating the need to reduce the shutdown speed of the power device to ensure that the voltage stress of the power device is within the specification, thereby reducing the stray inductance of the entire inverter power circuit, and effectively meeting the low-loss and high-efficiency use requirements of the power device.

[0034] It should be noted that the main body of the core 1 is formed by winding a metallized film, and then gold is sprayed on two opposite sides of the main body of the core 1 along a first direction to form a gold spray layer for improving the conductivity and stability of the capacitor, and the outer surfaces of the two gold spray layers are respectively formed into a first surface 11 and a second surface 12. The first connecting portion 22 and the second connecting portion 32 are respectively connected to the first surface 11 and the second surface 12 by soldering.

[0035] In addition, for ease of understanding, Figure 1 The direction indicated by the arrow A is the first direction of the DC capacitor according to the embodiment of the utility model. Figure 1 The direction indicated by the middle arrow B is the second direction of the DC capacitor according to the embodiment of the utility model. In this embodiment, the outer contour of the core 1 is a rectangular parallelepiped, the first direction is the height direction of the core 1, and the second direction is the width direction of the core.

[0036] In some embodiments, Figure 2 As shown, the first output portion 23 also includes a first mounting portion and a first avoidance hole 232 arranged at intervals, and the second output portion 33 also includes a second mounting portion and a second avoidance hole arranged at intervals. On the projection plane perpendicular to the first direction, the projection of the first mounting portion coincides with the projection of the second avoidance hole, and the projection of the second mounting portion coincides with the projection of the first avoidance hole 232.

[0037] The first output part 23 is electrically connected to the HPD package power module interface through its first mounting part, and the second output part 33 is electrically connected to the HPD package power module interface through its second mounting part. By setting a second avoidance hole opposite to the first mounting part in the first direction, and setting a first avoidance hole 232 opposite to the second mounting part in the first direction, the first mounting part and the second mounting part are not blocked on both sides of the first direction, thereby facilitating the electrical connection between the first mounting part and the second mounting part and the HPD package power module interface.

[0038] Specifically, the first avoidance hole 232 is opened at the edge of the first output portion 23 away from the core 1, and the second avoidance hole is opened at the edge of the second output portion 33 away from the core 1. Figure 1 and Figure 2 As shown, the first avoidance hole 232 and the second avoidance hole are U-shaped through grooves with one side open.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, the first mounting portion is provided with a first screw hole 231 , and the second mounting portion is provided with a second screw hole 331 .

[0040] That is, the first mounting portion and the second mounting portion are detachably connected to the HPD package power module interface through the first screw hole 231 and the second screw hole 331, respectively, which is convenient for disassembly and assembly, and does not require the HPD package power module interface to be customized, thereby reducing the design and manufacturing costs of the HPD package power module interface. Moreover, the detachable design also improves the testability of the inverter using the DC capacitor of this embodiment.

[0041] Specifically, Figure 2 As shown, there are three first mounting parts and three second mounting parts, each first mounting part includes a first screw hole 231, each second mounting part includes a second screw hole 331, and the three first screw holes 231 and the three second screw holes 331 are alternately arranged along a third direction, and the third direction is perpendicular to each of the second direction and the first direction.

[0042] In some embodiments, on the projection plane perpendicular to the first direction, the projection area of ​​the first output portion 23 is S1, the projection area of ​​the second output portion 33 is S2, and the area of ​​the overlapping portion of the first output portion 23 and the second output portion 33 is S3, wherein S3 / S1>90%, S3 / S2>90%.

[0043] As a result, the stacking coverage area between the first output portion 23 and the second output portion 33 is sufficiently large, and the reduction of the stray inductance of the DC capacitor is greater and more obvious.

[0044] Specifically, on the projection plane perpendicular to the first direction, the size and shape of the projected outer contour of the first output portion 23 is substantially the same as the size and shape of the projected outer contour of the second output portion 33 , and the first output portion 23 and the second output portion 33 are substantially mirror-symmetrically arranged in the first direction.

[0045] In some embodiments, Figure 2As shown, the first copper busbar 2 further includes a first bending portion 24 connecting the first connection portion 22 and the first output portion 23, and the first bending portion 24 extends from the first connection portion 22 toward the direction close to the second connection portion 32. And / or, the second copper busbar 3 further includes a second bending portion 34 connecting the second connection portion 32 and the second output portion 33, and the second bending portion 34 extends from the second connection portion 32 toward the direction close to the first connection portion 22.

[0046] By providing the first bending portion 24 and / or the second bending portion 34, the distance between the first output portion 23 and the second output portion 33 is effectively shortened while ensuring that the first output portion 23 and the second output portion 33 are separated from each other, which not only facilitates the electrical connection between the first output portion 23 and the second output portion 33 and the HPD package power module interface, but also reduces the stray inductance caused by the connection, effectively meeting the low-loss and high-efficiency use requirements of power devices.

[0047] For example, the first output portion 23 and the second output portion 23 are parallel and adjacent to the middle position of the core 1 in the first direction. This arrangement makes the distance between the first output portion 23 and the second output portion 33 smaller, and also makes the first output portion 23 and the second output portion 33 farther away from the first connection portion 22 and the second connection portion 32, effectively reducing the stray inductance of the DC capacitor, thereby effectively reducing the stray inductance of the entire inverter power circuit.

[0048] In some embodiments, Figure 4 and Figure 5 As shown, the DC capacitor further includes an insulating layer 4 , which is located between the first output portion 23 and the second output portion 33 , and is connected to at least one of the first output portion 23 and the second output portion 33 .

[0049] On the basis that the distance between the first output portion 23 and the second output portion 33 is relatively small, the insulating layer 4 effectively reduces the risk of electrical contact between the first output portion 23 and the second output portion 33 , thereby effectively ensuring the functionality of the DC capacitor.

[0050] Specifically, the insulating layer 4 may be connected to only the first output portion 23 or the second output portion 33, or may have two insulating layers 4 connected to the first output portion 23 and the second output portion 33, respectively. Figure 5 As shown, the insulating layer 4 is connected to the side of the second output portion 33 facing the first output portion 23 , and the insulating layer 4 and the second output portion 33 are arranged at intervals.

[0051] The insulating layer 4 includes insulating paper, which is hot pressed or bonded on the surface of the first output part 23 facing the second output part 33, and / or, the insulating paper is hot pressed or bonded on the surface of the second output part 33 facing the first output part 23. Therefore, the connection between the insulating layer 4 and the first output part 23 and / or the second output part 33 is convenient and reliable, and the cost of insulating the first output part 23 and / or the second output part 33 is low.

[0052] For example, the number of insulating papers is one sheet, and the insulating paper covers all surfaces of the first output portion 23 facing the second output portion 22, or as shown in FIG. Figure 5 As shown, the insulating paper covers all surfaces of the second output portion 33 facing the first output portion 23 .

[0053] For example, there are two sheets of insulating paper, one of which covers all surfaces of the first output part 23 facing the second output part 22 , and the other covers all surfaces of the second output part 33 facing the first output part 23 .

[0054] For example, Figure 4 As shown, the middle part of the insulating paper is bent to form two angled parts, one of which covers all surfaces of the first output part 23 facing the second output part 22, and the other covers the surface of the first bent part 24 facing the core 2. Or, as Figure 5 As shown, the middle part of the insulating paper is bent to form two angled parts, one of which covers all surfaces of the second output part 33 facing the first output part 23 , and the other covers the surface of the second bent part 34 facing the core 2 .

[0055] In some embodiments, Figure 1 As shown, the DC capacitor further includes a housing 5 and a glue potting member, the housing 5 has a mounting cavity and a first through hole, a second through hole and a third through hole connected to the mounting cavity. The first copper busbar 2 also includes a first input portion 21 connected to the first connection portion 22, and the second copper busbar 3 also includes a second input portion 31 connected to the second connection portion 32. The core 1, the first connection portion 22 and the second connection portion 32 are all arranged in the mounting cavity, the first input portion 21 passes through the first through hole and protrudes outside the housing 5, the second input portion 31 passes through the second through hole and protrudes outside the housing 5, and the first output portion 23 and the second output portion 33 pass through the third through hole and protrude outside the housing 5. The glue potting member is arranged in the mounting cavity, and the glue potting member is filled between the outer surface of each of the core 1, the first connection portion 22 and the second connection portion 32 and the inner surface of the mounting cavity.

[0056] After the glue potting is cured, it can achieve sealing and protection of the core 1 , the first connecting portion 22 and the second connecting portion 32 inside the shell 5 , and also ensure the reliability of the fixed installation of the above three in the shell 5 .

[0057] Specifically, the glue potting member is made of epoxy resin material, the core 1 further has a second side opposite to the second direction, and the first input portion 21 and the second input portion 31 are both located on the second side of the core 1. At this time, the first through hole and the second through hole are both located on the same side wall of the housing 5, and the third through hole is located on another side wall of the housing 5 opposite to the above side wall.

[0058] The assembly process of the DC capacitor is as follows: the core 1, the first copper bar 2 and the second copper bar 3 are matched in the installation cavity through the third through hole, and the first input part 21 and the second input part 31 are respectively inserted into the first through hole and the second through hole; then, the preheated epoxy resin material is poured into the installation cavity through the third through hole in a vacuum environment to fill the gap between the outer surface of each of the core 1, the first copper bar 2 and the second copper bar 3 and the inner surface of the installation cavity, and finally the potted part is formed by high-temperature curing to realize the assembly of the DC capacitor.

[0059] In some embodiments, Figure 1 As shown, the DC capacitor also includes a first sealing ring 6 and a second sealing ring 7. The first sealing ring 6 is sleeved on the first input part 21 and clamped between the surface of the first input part 21 and the inner surface of the first through hole. The second sealing ring 7 is sleeved on the second input part 31 and clamped between the surface of the second input part 31 and the inner surface of the second through hole.

[0060] The first sealing ring 6 seals the gap between the surface of the first input part 21 and the surface of the first through hole, and the second sealing ring 7 seals the gap between the surface of the second input part 31 and the surface of the second through hole, thereby effectively preventing the glue from leaking through the above-mentioned gaps during the glue pouring process and affecting the appearance of the DC capacitor, and also preventing the leaked glue from covering the first input part 21 and the second input part 31 and affecting the electrical connection between the first input part 21 and the second input part 31 and other electrical components.

[0061] A vehicle according to an embodiment of the present utility model includes a DC capacitor as described in any of the above embodiments.

[0062] The technical advantages of the vehicle according to the embodiment of the utility model are the same as the technical advantages of the DC capacitor of the above-mentioned embodiment, which will not be repeated here.

[0063] It should be noted that DC capacitors can be used in the vehicle's start-stop system. At this time, DC capacitors can extend battery life, save fuel consumption and reduce emissions. DC capacitors can also be used in the vehicle's energy storage system to play a role in braking energy recovery and voltage stabilization. DC capacitors can also be used in conjunction with secondary batteries to achieve energy storage and form a stable, energy-saving and environmentally friendly power supply for electric vehicles.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A DC capacitor, characterized in that: include: a core having a first surface and a second surface opposite to each other along a first direction, the core further having a first side opposite to a second direction, the second direction being perpendicular to the first direction; a first copper bar, the first copper bar comprising a first connecting portion and a first output portion connected to each other, the first connecting portion being connected to the first surface of the core, and the first output portion being located at a first side of the core; and A second copper busbar, wherein the second copper busbar comprises a second connecting portion and a second output portion connected to each other, the second connecting portion is connected to the second surface of the core, the second output portion is located on a first side of the core, and on a projection plane perpendicular to the first direction, a projection of the first output portion and a projection of the second output portion partially overlap.

2. The DC capacitor according to claim 1, characterized in that: The first output portion further includes a first mounting portion and a first avoidance hole arranged at intervals, and the second output portion further includes a second mounting portion and a second avoidance hole arranged at intervals. On a projection plane perpendicular to the first direction, the projection of the first mounting portion coincides with the projection of the second avoidance hole, and the projection of the second mounting portion coincides with the projection of the first avoidance hole.

3. The DC capacitor according to claim 2, characterized in that: The first mounting portion is provided with a first screw hole, and the second mounting portion is provided with a second screw hole.

4. The DC capacitor according to claim 1, characterized in that: On a projection plane perpendicular to the first direction, a projection area of ​​the first output portion is S1, a projection area of ​​the second output portion is S2, and an overlapping area of ​​the first output portion and the second output portion is S3, wherein S3 / S1>90%, S3 / S2>90%.

5. The DC capacitor according to claim 1, characterized in that: The first copper busbar further includes a first bending portion connecting the first connecting portion and the first output portion, and the first bending portion extends from the first connecting portion toward a direction close to the second connecting portion; And / or, the second copper busbar further includes a second bending portion connecting the second connecting portion and the second output portion, and the second bending portion extends from the second connecting portion toward a direction approaching the first connecting portion.

6. The DC capacitor according to claim 5, characterized in that: The first output portion and the second output portion are parallel and both adjacent to a middle position of the core in the first direction.

7. The DC capacitor according to claim 1, characterized in that: The DC capacitor further includes an insulating layer, the insulating layer is located between the first output portion and the second output portion, and the insulating layer is connected to at least one of the first output portion and the second output portion.

8. The DC capacitor according to claim 7, characterized in that: The insulating layer includes insulating paper, which is hot-pressed or bonded to a surface of the first output part facing the second output part, and / or the insulating paper is hot-pressed or bonded to a surface of the second output part facing the first output part.

9. The DC capacitor according to claim 1, characterized in that: The DC capacitor also includes: A housing, the housing having an installation cavity and a first through hole, a second through hole and a third through hole communicating with the installation cavity, the first copper busbar further comprising a first input portion connected to the first connection portion, the second copper busbar further comprising a second input portion connected to the second connection portion, the core, the first connection portion and the second connection portion are all arranged in the installation cavity, the first input portion passes through the first through hole and protrudes outside the housing, the second input portion passes through the second through hole and protrudes outside the housing, and the first output portion and the second output portion pass through the third through hole and protrude outside the housing; and A glue potting member is disposed in the installation cavity, and the glue potting member is filled between the outer surface of each of the core, the first connecting portion, and the second connecting portion and the inner surface of the installation cavity.

10. The DC capacitor according to claim 9, characterized in that: The DC capacitor also includes a first sealing ring and a second sealing ring, wherein the first sealing ring is sleeved on the first input part and clamped between the surface of the first input part and the inner surface of the first through hole, and the second sealing ring is sleeved on the second input part and clamped between the surface of the second input part and the inner surface of the second through hole.

11. A vehicle, characterized in that: Comprising a DC capacitor according to any one of claims 1-10.

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