Filtering capacitor assembly, filter, inverter, electric drive assembly and vehicle

Abstract

The application belongs to the technical field of vehicles, and particularly relates to a filter capacitor assembly, a filter, an inverter and a vehicle. The filter capacitor assembly comprises a filter capacitor, a switching busbar and a grounding busbar. The filter capacitor comprises a first capacitor and a second capacitor. The length of the first capacitor extends along a first direction. The first capacitor is located on one side of the second capacitor along a second direction. The length of the second capacitor extends along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The arrangement mode of the first capacitor and the second capacitor optimizes the structure and volume of the filter capacitor assembly.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a filter capacitor assembly, a filter, an inverter, an electric drive assembly, and a vehicle. Background Technology

[0002] A filter is a frequency-selective device that allows specific frequency components of a signal to pass through while significantly attenuating other frequency components, thereby eliminating interference noise. Filters are a crucial component of automotive inverters, their function being to filter out the AC component from the input DC current, reduce the input voltage ripple coefficient, and suppress noise propagation. Therefore, optimizing the filter's performance is an effective means of reducing inverter operating noise, and the key performance parameter affecting filter performance is the series inductance of the capacitors. In related technologies, the lengths of the first capacitor, second capacitor a, second capacitor b, positive terminal busbar, and negative terminal busbar all extend in the same direction, resulting in a dispersed, non-compact filter structure and a large size. Summary of the Invention

[0003] The purpose of this invention is to provide a filter capacitor assembly, filter, inverter, electric drive assembly, and vehicle, with optimized structure and size.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] The filter capacitor assembly includes:

[0006] A first capacitor and a second capacitor, wherein the length of the first capacitor extends along a first direction, the first capacitor is located on one side of the second capacitor along a second direction, and the length of the second capacitor extends along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0007] Preferably, the second capacitor includes a second capacitor a and a second capacitor b spaced apart along the first direction. The filter capacitor assembly further includes a transition bus and a ground bus. The transition bus includes a positive transition bus and a negative transition bus. The positive transition bus is connected to one end of the first capacitor along its length and one end of the second capacitor a along its length. The negative transition bus is connected to the other end of the first capacitor along its length and one end of the second capacitor b along its length. The ground bus is connected to the other ends of the second capacitor a and the second capacitor b along their length.

[0008] Preferably, the positive terminal busbar is in direct contact with both the first capacitor and the second capacitor a; and / or

[0009] The negative terminal busbar is directly connected to both the first capacitor and the second capacitor b; and / or

[0010] The grounding busbar is directly connected to both the second capacitor a and the second capacitor b.

[0011] Preferably, the width-to-thickness ratio of both the positive and negative terminal busbars is not less than 10; and / or

[0012] The width-to-thickness ratio of the grounding busbar is not less than 10.

[0013] Preferably, it further includes an insulating positioning element, which includes a receiving portion and a positioning portion, the receiving portion accommodating the first capacitor and the positioning portion positioning the grounding busbar.

[0014] Preferably, the positioning part is a positioning pin, and the grounding busbar is provided with a positioning pin hole that is inserted and engaged with the positioning pin.

[0015] Preferably, the insulating positioning member further includes a first insulating part and / or a second insulating part, wherein the first insulating part is disposed between the first capacitor and the second capacitor a and the second capacitor b, and the second insulating part is disposed between the second capacitor a and the second capacitor b.

[0016] Preferably, the grounding busbar includes a first grounding busbar and a second grounding busbar, both of which are Z-shaped. The first grounding busbar includes a first contact portion, a first fixing portion, and a first connecting portion connecting the first contact portion and the first fixing portion. The first contact portion is connected to the second capacitor a, and the first fixing portion is positioned and engaged with the first positioning portion. The second grounding busbar includes a second contact portion, a second fixing portion, and a second connecting portion connecting the second contact portion and the second fixing portion. The second contact portion is connected to the second capacitor b, and the second fixing portion is positioned and engaged with the first positioning portion.

[0017] Preferably, the positive terminal busbar is provided with a first clamping part, and the negative terminal busbar is provided with a second clamping part, the first clamping part and the second clamping part being used to clamp the positive and negative terminal busbars together.

[0018] The filter includes positive and negative busbars and a filter capacitor assembly as described in any of the above schemes, wherein the positive and negative transition busbars in the filter assembly are both connected to the positive and negative busbars.

[0019] An inverter includes an inverter housing and a filter as described in any of the above embodiments, the filter being disposed within the inverter housing.

[0020] Preferably, the filter is fixed inside the inverter housing by potting compound.

[0021] Preferably, the device further includes an insulating positioning component, which includes a second positioning part for positioning the filter in conjunction with the inverter housing.

[0022] An electric drive assembly, including an inverter as described in any of the above embodiments.

[0023] The vehicle includes the electric drive assembly as described in any of the above embodiments.

[0024] The beneficial effects of this invention are:

[0025] This invention provides a filter capacitor assembly, including a filter capacitor, an adapter busbar, and a grounding busbar. The filter capacitor includes a first capacitor and a second capacitor. The length of the first capacitor extends along a first direction, and the first capacitor is located on one side of the second capacitor along a second direction. The length of the second capacitor extends along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. The arrangement of the first and second capacitors optimizes the structure and size of the filter capacitor assembly. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of the filter capacitor assembly provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the filter capacitor assembly provided in an embodiment of the present invention from a second perspective.

[0028] Figure 3 This is a schematic diagram of the filter structure provided in an embodiment of the present invention;

[0029] Figure 4 This is a partial structural schematic diagram of the inverter provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 11. First capacitor; 12. Second capacitor a; 13. Second capacitor b;

[0032] 21. Positive terminal busbar; 211. First main body; 212. First capacitor connection part; 213. Second capacitor a connection part; 214. First clamping part; 22. Negative terminal busbar; 221. Second main body; 222. Second capacitor connection part; 223. Second capacitor b connection part; 224. Second clamping part;

[0033] 31. First grounding busbar; 311. First contact portion; 312. First fixing portion; 3121. First positioning pin hole; 3122. First grounding hole; 313. First connecting portion; 32. Second grounding busbar; 321. Second contact portion; 322. Second fixing portion; 3221. Second positioning pin hole; 3222. Second grounding hole; 323. Second connecting portion;

[0034] 40. Insulating positioning component; 41. Receiving part; 42. First positioning part; 421. First positioning pin; 43. Second positioning part; 431. Second positioning pin; 44. First insulating part; 45. Second insulating part; 46. Guide positioning part;

[0035] 50. Positive and negative busbars;

[0036] 100. Inverter housing. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] like Figures 1 to 2 As shown, the present invention provides a filter capacitor assembly, including a filter capacitor, a transition busbar, and a grounding busbar. The filter capacitor includes a first capacitor 11, a second capacitor a12, and a second capacitor b13. The first capacitor 11, the second capacitor a12, and the second capacitor b13 are all bare-core capacitors formed by thin-film winding. The length of the first capacitor 11 extends along a first direction. The second capacitor a12 and the second capacitor b13 are spaced apart along the first direction. The first capacitor 11 is located on one side of the second capacitor a12 and the second capacitor b13 along a second direction. The lengths of capacitors a12 and b13 extend along a third direction, with the first, second, and third directions perpendicular to each other. The transition busbar includes a positive transition busbar 21 and a negative transition busbar 22. The positive transition busbar 21 is connected to one end of the first capacitor 11 along its length and one end of the second capacitor a12 along its length. The negative transition busbar 22 is connected to the other end of the first capacitor 11 along its length and one end of the second capacitor b13 along its length. The grounding busbar is connected to the other ends of the second capacitor a12 and the second capacitor b13 along their length. Optionally, the grounding busbar includes a first grounding busbar 31 and a second grounding busbar 32. The first grounding busbar 31 is connected to the other end of the second capacitor a12 along its length, and the second grounding busbar 32 is connected to the other end of the second capacitor b13 along its length. The arrangement of the first capacitor 11, the second capacitor a12, and the second capacitor b13 optimizes the structure and volume of the filter capacitor assembly.

[0042] The positive terminal busbar 21 is directly connected to the first capacitor 11 and the second capacitor a12; and / or, the negative terminal busbar 22 is directly connected to the first capacitor 11 and the second capacitor b13; and / or, the first grounding busbar 31 is directly connected to the second capacitor a12, and the second grounding busbar 32 is directly connected to the second capacitor b13. Optionally, the positive terminal busbar 21 can be connected to the first capacitor 11 and the second capacitor a12 by soldering or resistance welding. The negative terminal busbar 22 can be connected to the first capacitor 11 and the second capacitor b13 by soldering or resistance welding. The first grounding busbar 31 can be connected to the second capacitor a12 by soldering or resistance welding. The second grounding busbar 32 can be connected to the second capacitor b13 by soldering or resistance welding.

[0043] By directly connecting the positive terminal busbar 21 to the first capacitor 11 and the second capacitor a12, the negative terminal busbar 22 to the first capacitor 11 and the second capacitor b13, the first grounding busbar 31 to the second capacitor a12, and the second grounding busbar 32 to the second capacitor b13, the lead wires between the positive terminal busbar 21 and the first capacitor 11 and the second capacitor a12, the negative terminal busbar 22 and the first capacitor 11 and the second capacitor b13, the first grounding busbar 31 and the second capacitor a12, and the second grounding busbar 32 and the second capacitor b13 are eliminated. This eliminates the problem of large series inductance caused by factors such as small current-carrying area and long layout path of the lead wires.

[0044] Specifically, the positive terminal busbar 21 includes a first body 211, a first capacitor connection portion 212, and a second capacitor a connection portion 213. The first capacitor connection portion 212 is used for contact connection with the first capacitor 11, and the second capacitor a connection portion 213 is used for contact connection with the second capacitor a12. The negative terminal busbar 22 includes a second body 221, a second first capacitor connection portion 222, and a second capacitor b connection portion 223. The second first capacitor connection portion 222 is used for contact connection with the first capacitor 11, and the second capacitor b connection portion 223 is used for contact connection with the second capacitor b13.

[0045] In this embodiment, there are two second capacitors a12 and two second capacitors b13, with the two second capacitors a12 spaced apart along the second direction and the two second capacitors b13 spaced apart along the second direction. Correspondingly, the positive terminal busbar 21 includes two second capacitor a connection portions 213, each connected to one of the two second capacitors a12; the negative terminal busbar 22 includes two second capacitor b connection portions 223, each connected to one of the two second capacitors b13. Correspondingly, there are two first grounding busbars 31 and two grounding busbars 32, each connected to one of the two second capacitors a12 and the two second grounding busbars 32. In other embodiments, the number of second capacitors a12 and two second capacitors b13 may be one or more, and this embodiment is not the limitation.

[0046] In this embodiment, the width-to-thickness ratio of both the positive and negative busbars 21 and 22 is not less than 10. With the cross-sectional areas of the positive and negative busbars 21 and 22 remaining constant, a larger width-to-thickness ratio results in a wider contact width with the filter capacitor, i.e., a larger contact area. By setting the width-to-thickness ratio of both the positive and negative busbars 21 and 22 to not less than 10, the contact area between the positive and negative busbars 21 and 22 and the filter capacitor can be guaranteed, thus reducing the series inductance.

[0047] In this embodiment, the width-to-thickness ratio of both the first grounding busbar 31 and the second grounding busbar 32 is not less than 10. This arrangement ensures the contact area between the first grounding busbar 31 and the second grounding busbar 32 and the filter capacitor, thereby reducing the series inductance.

[0048] Furthermore, the filter capacitor assembly also includes an insulating positioning member 40, on which a receiving portion 41 is formed, accommodating the first capacitor 11; the insulating positioning member 40 also has a first positioning portion, which positions itself against the grounding busbar. Optionally, the first positioning portion includes a first positioning portion 42 and a second positioning portion 43, where the first positioning portion 42 positions the first grounding busbar 31, and the second positioning portion 43 positions the second grounding busbar 32. By providing the insulating positioning member 40, the filter capacitor, the transition busbar, and the grounding busbar can be integrated together, eliminating the need for a packaging shell and potting within the packaging shell, optimizing the process, size, and cost of the filter capacitor assembly, and improving the heat dissipation efficiency of the filter capacitor assembly.

[0049] Optionally, both the first positioning part 42 and the second positioning part 43 are positioning pins, and both the first grounding busbar 31 and the second grounding busbar 32 are provided with positioning pin holes that engage with the positioning pins. Alternatively, both the first positioning part 42 and the second positioning part 43 may also include two positioning protrusions, which abut against the two opposite sidewalls of the corresponding grounding busbars. In this embodiment, the first positioning part 42 includes two first positioning pins 421, and each first grounding busbar 31 is provided with a first positioning pin hole 3121. The two first positioning pins 421 are inserted into the first positioning pin holes 3121 on the two first grounding busbars 31 in a one-to-one correspondence. The second positioning part 43 includes two second positioning pins 431, and each second grounding busbar 32 is provided with a second positioning pin hole 3221. The two second positioning pins 431 are inserted into the second positioning pin holes 3221 on the two second grounding busbars 32 in a one-to-one correspondence.

[0050] Specifically, the first grounding busbar 31 is Z-shaped and includes a first contact portion 311, a first fixing portion 312, and a first connecting portion 313 connecting the first contact portion 311 and the first fixing portion 312. The first contact portion 311 is used to make contact with the second capacitor a12, and the first fixing portion 312 is used to position and cooperate with the first positioning portion 42. The structure of the second grounding busbar 32 is the same as that of the first grounding busbar 31. The second grounding busbar 32 is also Z-shaped and includes a second contact portion 321, a second fixing portion 322, and a second connecting portion 323 connecting the second contact portion 321 and the second fixing portion 322. The second contact portion 321 is used to make contact with the second capacitor b13, and the second fixing portion 322 is used to position and cooperate with the second positioning portion 43.

[0051] Furthermore, the insulating positioning member 40 is also provided with a first insulating portion 44 and / or a second insulating portion 45. The first insulating portion 44 is disposed between the first capacitor 11 and the second capacitor a12 and the second capacitor b13 to effectively achieve insulation between the first capacitor 11 and the second capacitor a12 and the second capacitor b13; the second insulating portion 45 is disposed between the second capacitor a12 and the second capacitor b13 to effectively achieve insulation between the second capacitor a12 and the second capacitor b13.

[0052] like Figure 3 As shown, the present invention also provides a filter, including positive and negative busbars 50 and the aforementioned filter capacitor assembly, wherein both the positive and negative transition busbars 21 and 22 are connected to the positive and negative busbars 50. By employing the aforementioned filter capacitor assembly, the series inductance can be reduced, and the process, size, and cost can be optimized.

[0053] Furthermore, a first clamping portion 214 is provided on the positive terminal busbar 21, and a second clamping portion 224 is provided on the negative terminal busbar 22. The positive and negative busbars 50 are clamped between the first clamping portion 214 and the second clamping portion 224, and are in contact with the first clamping portion 214 and the second clamping portion 224. Optionally, the positive and negative busbars 50 can be connected to the first clamping portion 214 and the second clamping portion 224 by laser welding or soldering. The filter capacitor assembly can achieve high-voltage current connection in a single connection through the positive and negative terminal busbars, optimizing the filter process.

[0054] like Figure 4 As shown, the present invention also provides an inverter, including an inverter housing 100 and the aforementioned filter, the filter being disposed within the inverter housing 100. By employing the aforementioned filter, noise interference can be reduced, and the process, size, and cost can be optimized.

[0055] Furthermore, the filter is fixed inside the inverter housing 100 by potting compound. That is, the filter can be fixed by directly potting epoxy resin or other adhesives into the inverter housing 100. The filter's moisture-proof, insulation and fixation requirements are met in one potting process. At the same time, the insulation and fixation of the grounding busbar and positive and negative busbars 50 are indirectly completed in one process, and the fixation is reliable.

[0056] Furthermore, the insulating positioning component 40 also includes a guide positioning part 46, which is used to guide and position the assembly of the filter and the inverter housing 100. In this embodiment, the guide positioning part 46 is a guide positioning hole, and a guide positioning pin is provided on the inverter housing. The guide positioning hole and the guide positioning pin can be inserted into each other.

[0057] Furthermore, a first grounding post and a second grounding post are provided inside the filter housing. A first grounding hole 3122 is provided on the first grounding busbar 31, and a second grounding hole 3222 is provided on the second grounding busbar 32. The first grounding hole 3122 can be positioned and inserted with the first grounding post, and the second grounding hole 3222 can be positioned and inserted with the second grounding post, thereby realizing the precise positioning of the filter within the inverter housing 100.

[0058] The present invention also provides an electric drive assembly including the aforementioned inverter. By employing the aforementioned inverter, noise interference can be reduced and costs optimized.

[0059] The present invention also provides a vehicle including the above-described electric drive assembly. By employing the above-described electric drive assembly, noise interference can be reduced and costs optimized.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A filter capacitor assembly, characterized in that, include: A first capacitor (11) and a second capacitor, wherein the length of the first capacitor (11) extends along a first direction, the first capacitor (11) is located on one side of the second capacitor along a second direction, and the length of the second capacitor extends along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

2. The filter capacitor assembly according to claim 1, characterized in that, The second capacitor includes a second capacitor a (12) and a second capacitor b (13) spaced apart along the first direction. The filter capacitor assembly also includes a transfer bus and a ground bus. The transfer bus includes a positive transfer bus (21) and a negative transfer bus (22). The positive transfer bus (21) is connected to one end of the first capacitor (11) along the length direction and one end of the second capacitor a (12) along the length direction. The negative transfer bus (22) is connected to the other end of the first capacitor (11) along the length direction and one end of the second capacitor b (13) along the length direction. The ground bus is connected to the other end of the second capacitor a (12) and the second capacitor b (13) along the length direction.

3. The filter capacitor assembly according to claim 2, characterized in that, The positive terminal busbar (21) is in direct contact with both the first capacitor (11) and the second capacitor a (12); and / or The negative terminal busbar (22) is in direct contact with both the first capacitor (11) and the second capacitor b (13); and / or The grounding busbar is directly connected to the second capacitor a (12) and the second capacitor b (13).

4. The filter capacitor assembly according to claim 2, characterized in that, The width-to-thickness ratio of both the positive terminal busbar (21) and the negative terminal busbar (22) is not less than 10; and / or The width-to-thickness ratio of the grounding busbar is not less than 10.

5. The filter capacitor assembly according to claim 2, characterized in that, It also includes an insulating positioning member (40), which includes a receiving part (41) and a first positioning part. The receiving part (41) receives the first capacitor (11), and the positioning part positions the grounding busbar.

6. The filter capacitor assembly according to claim 5, characterized in that, The positioning part is a positioning pin, and the grounding busbar is provided with a positioning pin hole that is inserted and engaged with the positioning pin.

7. The filter capacitor assembly according to claim 5, characterized in that, The insulating positioning member (40) further includes a first insulating part (44) and / or a second insulating part (45), wherein the first insulating part (44) is disposed between the first capacitor (11) and the second capacitor a (12) and the second capacitor b (13), and the second insulating part (45) is disposed between the second capacitor a (12) and the second capacitor b (13).

8. The filter capacitor assembly according to claim 5, characterized in that, The grounding busbar includes a first grounding busbar (31) and a second grounding busbar (32). Both the first grounding busbar (31) and the second grounding busbar (32) are Z-shaped. The first grounding busbar (31) includes a first contact portion (311), a first fixing portion (312), and a first connecting portion (313) connecting the first contact portion (311) and the first fixing portion (312). The first contact portion (311) is connected to the second capacitor a (12), and the first fixing portion (312) is positioned and engaged with the first positioning portion (42). The second grounding busbar (32) includes a second contact portion (321), a second fixing portion (322), and a second connecting portion (323) connecting the second contact portion (321) and the second fixing portion (322). The second contact portion (321) is connected to the second capacitor b (13), and the second fixing portion (322) is positioned and engaged with the first positioning portion (42).

9. The filter capacitor assembly according to claim 2, characterized in that, The positive terminal busbar (21) is provided with a first clamping part (214), and the negative terminal busbar (22) is provided with a second clamping part (224). The first clamping part (214) and the second clamping part (224) are used to clamp the positive and negative terminals (50) together.

10. A filter, characterized in that, It includes a positive and negative busbar (50) and a filter capacitor assembly as described in any one of claims 1-9, wherein the positive and negative transition busbars (21) and the negative transition busbar (22) in the filter assembly are both connected to the positive and negative busbars (50).

11. An inverter, characterized in that, It includes an inverter housing (100) and a filter as described in claim 10, the filter being disposed within the inverter housing (100).

12. The inverter according to claim 11, characterized in that, The filter is fixed inside the inverter housing (100) by potting compound.

13. The inverter according to claim 11, characterized in that, It also includes an insulating positioning component (40), which includes a guide positioning part (46) for guiding and positioning the assembly of the filter and the inverter housing (100).

14. An electric drive assembly comprising the inverter according to any one of claims 11-13.

15. A vehicle, characterized in that, Includes the electric drive assembly as described in claim 14.

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