Sealing member, inverter, motor controller, electric drive system, and vehicle

Abstract

A sealing member, an inverter, a motor controller, an electric drive system, and a vehicle. The sealing member comprises a sealing member main body (30), the sealing member main body (30) is adapted to pass through a through hole in an inverter housing (10), and the outer wall of the sealing member main body (30) can sealingly abut against the inner wall of the through hole, the sealing member main body (30) is provided with a sealing hole (321); the sealing hole (321) is used for the insertion of three-phase busbars (20a, 20b, 20c), and the inner wall of the sealing hole (321) can sealingly abut against the three-phase busbars (20a, 20b, 20c). The sealing member can seal gaps between the through hole in the inverter housing (10) and the three-phase busbars (20a, 20b, 20c) of a capacitor at the same time, so that there are few assembled parts and the process is simple, thereby improving the production efficiency.

Description

Seals, inverters, motor controllers, electric drive systems and vehicles

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411590564.5, filed on November 7, 2024, entitled "Seals, Inverters, Motor Controllers, Electric Drive Systems and Vehicles", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of vehicle technology, and more particularly to a seal, an inverter, a motor controller, an electric drive system, and a vehicle. Background Technology

[0004] As automotive inverters evolve towards higher voltage, higher switching frequency, higher power density, and higher integration, experimental and computational analysis has shown that the equivalent series inductance (ESL) plays a crucial role in the smoothness and stability of bus voltage and output phase current, as well as improving drive efficiency. Especially with the introduction of SiC high-frequency switching devices, ESL has become a major focus in electronic control design, reflecting the overall technical level of the control system. Reducing the ESL can improve inverter efficiency, increase output current capability, and reduce the risk of peak voltage stress. The magnitude of the ESL is strongly correlated with the capacitor busbar structure.

[0005] In related technologies, the positive and negative copper busbars of each phase in the three-phase copper busbars of the capacitor are distributed in parallel and spaced apart, with no overlap between them. The spacing between the positive and negative copper busbars is relatively large, resulting in a large equivalent series inductance of the capacitor. Furthermore, the three-phase copper busbars need to penetrate the inverter housing. Due to the large spacing and lack of overlap between the positive and negative copper busbars, the area they occupy is relatively long, further increasing the equivalent series inductance of the capacitor. In addition, the three-phase copper busbars are not connected to each other, and each phase copper busbar needs to be fitted with a sealing plug, which affects production efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a seal, inverter, motor controller, electric drive system, and vehicle that can improve production efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A seal includes a seal body having an outer edge for abutting against the inner wall of a through hole on an inverter housing, and a sealing hole for the common insertion of three-phase busbars of a capacitor on the seal body. The sealing hole extends through the seal body along its thickness direction and has a hole wall for abutting against the three-phase busbars.

[0009] As a preferred technical solution for the sealing element, the outer wall of the sealing element body is provided with a first sealing protrusion, which is used to abut against the inner wall of the through hole.

[0010] As a preferred technical solution for the sealing element, the sealing hole includes a first hole portion and a second hole portion. The length of the first hole portion is greater than the length of the second hole portion, and the first hole portion and the second hole portion are connected in a convex shape. The first hole portion is used for the insertion of the positive busbar and the insulation layer in the three-phase busbar, and the second hole portion is used for the insertion of the negative busbar in the three-phase busbar.

[0011] As a preferred technical solution for the sealing element, a second sealing protrusion is provided on the opposite sidewalls of the first hole and the second hole. The second sealing protrusion on the first hole is used to abut against the positive busbar, and the second sealing protrusion on the second hole is used to abut against the negative busbar.

[0012] As a preferred technical solution for the sealing element, a third sealing protrusion is provided on the side wall where the first hole and the second hole are connected, and the third sealing protrusion is used to abut against the insulating layer.

[0013] As a preferred technical solution for the sealing element, there are multiple third sealing protrusions, which are spaced apart along the axial direction of the sealing hole, and at least some of the third sealing protrusions have different protrusion heights facing the insulating layer.

[0014] As a preferred technical solution for the sealing element, the third sealing protrusion has a guide slope, which is inclined along the insertion direction of the three-phase busbar and the sealing hole.

[0015] As a preferred technical solution for the sealing element, the main body of the sealing element includes a support frame and a sealing layer, the sealing layer covering the outside of the support frame, and the hardness of the support frame being greater than the hardness of the sealing layer.

[0016] Inverters, including:

[0017] The inverter housing has a through hole;

[0018] Capacitors, including three-phase busbars;

[0019] As described in any of the above embodiments, the main body of the sealing element penetrates through the through hole, and the outer wall of the main body of the sealing element is in sealing contact with the inner wall of the through hole. The three-phase busbars are inserted into the sealing hole, and the wall of the sealing hole is in sealing contact with the three-phase busbars.

[0020] As a preferred technical solution for inverters, each phase busbar includes a positive busbar and a negative busbar, which are stacked in parallel along the width direction of the sealing hole.

[0021] As a preferred technical solution for the inverter, each phase busbar also includes an insulation layer, which is disposed between the positive busbar and the negative busbar, and the insulation layer in the three phase busbars is integrally disposed.

[0022] The motor controller includes the inverter as described in the above scheme.

[0023] An electric drive system, including a motor controller as described in the above scheme.

[0024] Vehicles, including the electric drive system described in the above scheme.

[0025] The beneficial effects of this invention are:

[0026] This invention provides a sealing component that can simultaneously seal the gap between the through hole on the inverter housing and the three-phase busbar of the capacitor. It has fewer assembly parts, simpler process, and improves production efficiency.

[0027] This invention provides an inverter, including an inverter housing, a capacitor, and the aforementioned sealing element. The inverter housing has a through hole. The capacitor includes three-phase busbars, with adjacent two-phase busbars interconnected, and all three busbars passing through the through hole. The sealing element seals the gap between the through hole and the three-phase busbars. By using the aforementioned sealing element, all three-phase busbars can be sealed simultaneously, reducing the number of assembly parts, simplifying the process, and improving production efficiency.

[0028] The present invention also provides a motor controller including the inverter described above, which can improve production efficiency by using the inverter.

[0029] The present invention also provides an electric drive system including the above-mentioned motor controller, which can improve production efficiency by using the above-mentioned motor controller.

[0030] The present invention also provides a vehicle including the above-described electric drive system, which can improve production efficiency. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the inverter provided in an embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of the inverter provided in an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of the support frame of the sealing element body involved in the embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of the sealing layer of the sealing body involved in the embodiment of the present invention;

[0035] Figure 5 is a partial structural schematic diagram of the sealing element body involved in the embodiment of the present invention.

[0036] In the diagram: 10. Inverter housing; 20a. U-phase busbar; 20b. V-phase busbar; 20c. W-phase busbar; 21. Positive busbar; 22. Negative busbar; 23. Insulation layer; 30. Sealing body; 31. Support frame; 311. First frame; 312. Second frame; 313. Limiting frame; 314. Joint; 32. Sealing layer; 321. Sealing hole; 3211. First hole; 3212. Second hole; 322. First sealing protrusion; 323. Second sealing protrusion; 324. Third sealing protrusion; 3241. Guide slope. Specific 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] An inverter is a device in a vehicle that converts direct current (DC) from the battery into three-phase alternating current (AC) to drive and control the motor. Capacitors are connected in parallel to the inverter's DC bus to buffer voltage spikes generated by the bus and IGBT switches, and to provide instantaneous peak power to the inverter. Experimental and computational analysis has revealed that the equivalent series inductance (ESL) plays a crucial role in the smoothness and stability of the inverter's bus voltage and output phase current, as well as improving drive efficiency; it is a key design parameter for evaluating capacitor performance. Reducing the ESL can improve inverter efficiency, increase output current capability, and reduce the risk of voltage spikes. The magnitude of the ESL is strongly correlated with the structure of the capacitor's three-phase busbar.

[0042] In related technologies, the three-phase busbars of a capacitor are spaced apart along a first direction. Each phase busbar includes a positive busbar and a negative busbar, which are parallel and spaced apart along the first direction. Because there is no overlap between the positive and negative busbars and a gap along the first direction, the equivalent series inductance of the capacitor is relatively large. Furthermore, the capacitor casing has three through holes, through which the three-phase busbars pass. When the positive and negative busbars exit the capacitor casing, the lack of overlap results in a longer total length along the first direction for the positive and negative busbars, further increasing the equivalent series inductance of the capacitor. Additionally, each of the three phase busbars requires a sealing plug to seal the gap between each phase busbar and the through holes, resulting in numerous assembly parts and complex processes, thus affecting production efficiency.

[0043] As shown in Figures 1 to 5, an embodiment of the present invention provides an inverter, including an inverter housing 10, a capacitor, and a sealing element. The inverter housing 10 is provided with a through hole. The capacitor includes three-phase busbars, each of which includes a positive busbar 21 and a negative busbar 22. The positive busbar 21 and the negative busbar 22 are stacked in parallel along the width direction of the through hole (or along the width direction of the sealing hole 321 mentioned below). An insulating layer 23 is sandwiched between the positive busbar 21 and the negative busbar 22. Adjacent two-phase busbars are interconnected, and the three-phase busbars pass through the through hole. The sealing element is used to seal the gap between the through hole and the three-phase busbars.

[0044] By arranging the positive busbar 21 and negative busbar 22 in each phase busbar in parallel stacked configuration, the spacing between the positive busbar 21 and negative busbar 22 can be eliminated, reducing the equivalent series inductance. Furthermore, the positive busbar 21 and negative busbar 22 in each phase busbar remain in a parallel stacked configuration after passing through the through-hole, shortening the overall length of the positive busbar 21 and negative busbar 22 along the distribution direction of the three-phase busbars, further reducing the equivalent series inductance. In addition, the three-phase busbars are interconnected and pass through the through-hole together, and the three-phase busbars are sealed by the same sealing element, resulting in fewer assembly parts, simpler processes, and improved production efficiency.

[0045] It should be noted that, referring to Figure 1, the three-phase busbars of the capacitor are U-phase busbar 20a, V-phase busbar 20b, and W-phase busbar 20c, which are distributed along the first direction. The three-phase busbars can be copper, aluminum, or other materials, and there are no restrictions on their materials.

[0046] It should also be noted that both the positive busbar 21 and the negative busbar 22 are plate-like structures. A projection plane parallel to the positive and negative busbars 21 and 22 is defined. The parallel stacking of the positive and negative busbars 21 and 22 means that their orthogonal projections on the projection plane along a direction perpendicular to the projection plane at least partially overlap. That is, the orthogonal projections of the positive and negative busbars 21 and 22 along a direction perpendicular to the projection plane partially or completely overlap. Complete overlap can mean that the projected areas of the positive and negative busbars 21 and 22 are the same and overlap, or that the projected areas of the positive and negative busbars 21 and 22 are different, with the projection of the busbar with the smaller area falling entirely within the projection of the busbar with the larger area.

[0047] In this embodiment, the negative busbars 22 of two adjacent phase busbars in the three-phase busbar are connected as one unit. Alternatively, in other embodiments, the positive busbars 21 of two adjacent phase busbars in the three-phase busbar can be connected as one unit.

[0048] In this embodiment, the positive busbar 21 in each phase busbar includes two sub-positive busbars distributed along a first direction. By dividing the positive busbar 21 into two sub-positive busbars, the area of ​​each sub-positive busbar is smaller, which allows for better fit with the power module compared to a single positive busbar. In other embodiments, the positive busbar 21 can also be an integral structure.

[0049] In this embodiment, the insulation layer 23 of the three-phase busbar is integrally formed, that is, the insulation layer 23 is an integral structure, sandwiched between all the positive busbars 21 and all the negative busbars 22 of the three-phase busbar. Alternatively, in other embodiments, the insulation layer 23 can also be a split structure, that is, it includes three parts, each corresponding to one of the three-phase busbars, and each part is sandwiched between the positive busbar 21 and the negative busbar 22 of the corresponding phase busbar. In this embodiment, the positive busbar 21, the insulation layer 23, and the negative busbar 22 are formed into a composite busbar by hot pressing.

[0050] In this embodiment, to ensure the creepage distance and electrical clearance between the positive busbar 21 and the negative busbar 22, the insulating layer 23 is configured as a double-layer structure. Of course, in other embodiments, the insulating layer 23 can be one layer or more than two layers.

[0051] The sealing element includes a sealing element body 30. In this embodiment, the sealing element body 30 is a sealing plug, which is disposed in the through hole. A sealing hole 321 is provided on the sealing element body 30, which extends through the thickness of the sealing element body 30. The three-phase busbars pass through the sealing hole 321, and the inner wall of the sealing hole 321 is in sealing contact with the three-phase busbars. The outer wall of the sealing element body 30 is in sealing contact with the inner wall of the through hole. Alternatively, in other embodiments, the sealing element body 30 may also be a sealing strip, which is pressed between the three-phase busbars and the through hole, with the ends of the sealing strip abutting to form a closed loop.

[0052] Further, referring to Figure 2, the outer wall of the sealing body 30 is provided with a first sealing protrusion 322. The first sealing protrusion 322 is press-fitted against the inner wall of the through hole, so that the sealing body 30 and the inverter housing 10 achieve compression sealing with a certain compression ratio, and the sealing is reliable. Optionally, the first sealing protrusion 322 is provided in multiple layers, and the multiple layers of first sealing protrusions 322 are distributed at intervals along the axial direction of the through hole, further improving the sealing reliability between the sealing body 30 and the inverter housing 10. Optionally, the first sealing protrusion 322 is an annular protrusion continuously distributed along the circumference of the sealing body 30, or it is a plurality of separate protrusions distributed at intervals along the circumference of the sealing body 30. When the first sealing protrusion 322 is a plurality of separate protrusions distributed at intervals along the circumference of the sealing body 30, the separate protrusions in the multiple layers of first sealing protrusions 322 are staggered. Optionally, the cross-sectional shape of the first sealing protrusion 322 is semi-circular, but not limited to this.

[0053] The sealing hole 321 includes a first hole portion 3211 and a second hole portion 3212. The length of the first hole portion 3211 is greater than the length of the second hole portion 3212, and the first hole portion 3211 and the second hole portion 3212 are connected in a U-shape. The first hole portion 3211 is used for the insertion of the positive busbar 21 and the insulation layer 23 in the three-phase busbar, and the second hole portion 3212 is used for the insertion of the negative busbar 22 in the three-phase busbar. Through the above arrangement, it can better adapt to the structure of the three-phase busbar and improve the sealing performance between the sealing hole 321 and the three-phase busbar.

[0054] A second sealing protrusion 323 is provided on the opposite sidewalls of the first hole 3211 and the second hole 3212. The second sealing protrusion 323 on the first hole 3211 is used to abut against the positive busbar 21, and the second sealing protrusion 323 on the second hole 3212 is used to abut against the negative busbar 22, so that the sealing body 30 achieves a compression seal with the positive busbar 21 and the negative busbar 22 at a certain compression ratio, and the seal is reliable. Optionally, the second sealing protrusion 323 is provided in multiple layers, and the multiple layers of second sealing protrusions 323 are distributed at intervals along the axial direction of the through hole, further improving the sealing reliability between the sealing body 30 and the three-phase busbar. Optionally, the second sealing protrusion 323 is an annular protrusion continuously distributed along the circumference of the sealing body 30, or it is a plurality of separate protrusions distributed at intervals along the circumference of the sealing body 30. When the second sealing protrusion 323 is a plurality of separate protrusions spaced apart circumferentially along the sealing body 30, the separate protrusions in the multi-layer second sealing protrusion 323 are staggered. Optionally, the cross-sectional shape of the second sealing protrusion 323 is semi-circular, but is not limited to this.

[0055] Further, referring to Figure 5, a third sealing protrusion 324 is provided on the sidewall connecting the first hole 3211 and the second hole 3212. The third sealing protrusion 324 is press-fitted with the insulating layer 23, so that the sealing body 30 achieves a compression seal with the insulating layer 23 at a certain compression ratio. Optionally, there are multiple third sealing protrusions 324, which are distributed at intervals along the axial direction of the through hole, and at least some of the third sealing protrusions 324 have different protrusion heights. Since the surface tolerance of the insulating layer 23 fluctuates greatly along the axial direction of the through hole, that is, the surface of the insulating layer 23 is uneven along the axial direction of the through hole, by setting at least some of the third sealing protrusions 324 to have different protrusion heights, it is possible to better adapt to the surface fluctuations of the insulating layer 23, achieve the sealing of the insulating layer 23, and avoid leakage of potting compound.

[0056] The third sealing protrusion 324 has a guide slope 3241, which is inclined along the insertion direction of the three-phase busbar and the sealing hole 321 to guide the three-phase busbar when it is inserted into the sealing hole 321. Optionally, the cross-sectional shape of the third sealing protrusion 324 is triangular, but it is not limited to this.

[0057] It should be noted that, in this embodiment, in order to ensure the insulation distance, the length of the positive busbar 21 along the first direction is greater than the length of the negative busbar 22 along the first direction. The two ends of the insulating layer 23 along the first direction are flush with the ends of the positive busbar 21 and exposed at the ends of the negative busbar 22. The third sealing protrusion 324 and the part of the insulating layer 23 exposed at the ends of the negative busbar 22 are sealed and abutted.

[0058] Because the sealing body 30 simultaneously seals the three-phase busbars, its size is relatively large, resulting in high flexibility and assembly difficulties. To address this issue, the sealing body 30 is designed as a two-component composite structure. Specifically, the sealing body 30 includes a support frame 31 and a sealing layer 32. The sealing layer 32 covers the outside of the support frame 31, and the support frame 31 has a higher hardness than the sealing layer 32. Due to the higher hardness of the support frame 31, it provides rigid support for the sealing body 30, facilitating assembly.

[0059] In this embodiment, the support frame 31 is made of rigid plastic through injection molding, and the sealing layer 32 is formed on the basis of the support frame 31 by liquid rubber injection or rubber molding and vulcanization. In other embodiments, the support frame 31 can also be formed from other rigid materials through other processes, and the sealing layer 32 can also be formed from other flexible materials through other processes, and is not limited to these.

[0060] Specifically, the support frame 31 is generally annular and includes a first frame 311 and a second frame 312 vertically distributed. One end of the first frame 311 is connected to one end of the second frame 311. The sealing layer 32 covers the opposite sides of the first frame 311 and the end face away from the second frame 312, and also covers the opposite sides of the second frame 312. The first frame 311 and the corresponding portion of the sealing layer 32 on the first frame 311 are inserted into the through hole, and the second frame 312 and the corresponding portion of the sealing layer 32 on the second frame 312 are confined within the inverter housing 10. Further, the support frame 31 also includes a limiting frame 313, which is connected to the end of the second frame 312 away from the first frame 311. The two ends of the limiting frame 313 protrude from the opposite sides of the second frame 312, and the limiting frame 313 is used to limit the sealing layer 32 during its formation.

[0061] Furthermore, the support frame 31 is provided with multiple connecting portions 314 to ensure a better connection and bonding between the support frame 31 and the sealing layer 32 during the forming of the sealing layer 32. In this embodiment, the connecting portion 314 is a connecting hole, and a portion of the sealing layer 32 is embedded in the connecting hole. Alternatively, in other embodiments, the connecting portion 314 may also be a connecting protrusion, which is embedded in the sealing layer 32.

[0062] This invention also provides a motor controller, including the aforementioned inverter. By employing the inverter, the equivalent series inductance can be reduced, and production efficiency can be improved.

[0063] This invention also provides an electric drive system including the aforementioned motor controller. By employing the aforementioned motor controller, the equivalent series inductance can be reduced, and production efficiency can be improved.

[0064] This invention also provides a vehicle including the above-described electric drive system. By employing the above-described electric drive system, the equivalent series inductance can be reduced, and production efficiency can be improved.

[0065] 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 sealing element, comprising a sealing element body (30), the sealing element body (30) having an outer edge for abutting against the inner wall of a through hole on an inverter housing (10), the sealing element body (30) having a sealing hole (321) for a common insertion of a three-phase busbar of a capacitor, the sealing hole (321) being disposed through the thickness direction of the sealing element body (30), and the sealing hole (321) having a hole wall for abutting against the three-phase busbar.

2. The seal according to claim 1, wherein, The outer wall of the sealing body (30) is provided with a first sealing protrusion (322), which is used to abut against the inner wall of the through hole.

3. The seal according to claim 1 or 2, wherein, The sealing hole (321) includes a first hole (3211) and a second hole (3212). The length of the first hole (3211) is greater than the length of the second hole (3212), and the first hole (3211) and the second hole (3212) are connected in a U-shape. The first hole (3211) is used for the insertion of the positive busbar (21) and the insulation layer (23) in the three-phase busbar, and the second hole (3212) is used for the insertion of the negative busbar (22) in the three-phase busbar.

4. The seal according to claim 3, wherein, A second sealing protrusion (323) is provided on the opposite sidewalls of the first hole (3211) and the second hole (3212). The second sealing protrusion (323) on the first hole (3211) is used to abut against the positive busbar (21), and the second sealing protrusion (323) on the second hole (3212) is used to abut against the negative busbar (22).

5. The seal according to claim 3 or 4, wherein, A third sealing protrusion (324) is provided on the side wall where the first hole (3211) and the second hole (3212) are connected. The third sealing protrusion (324) is used to abut against the insulating layer (23).

6. The seal according to claim 5, wherein, The number of the third sealing protrusions (324) is multiple, and the multiple third sealing protrusions (324) are distributed at intervals along the axial direction of the sealing hole (321). At least some of the third sealing protrusions (324) have different protrusion heights in the direction of the insulating layer (23).

7. The seal according to claim 5 or 6, wherein, The third sealing protrusion (324) has a guide slope (3241) which is inclined along the insertion direction of the three-phase busbar and the sealing hole (321).

8. The seal according to any one of claims 1-7, wherein, The sealing body (30) includes a support frame (31) and a sealing layer (32). The sealing layer (32) covers the outside of the support frame (31), and the hardness of the support frame (31) is greater than that of the sealing layer (32).

9. Inverter, including: The inverter housing (10) is provided with a through hole; Capacitors, including three-phase busbars; According to any one of claims 1-8, the sealing body (30) penetrates the through hole, and the outer wall of the sealing body (30) is in sealing contact with the inner wall of the through hole, and the three-phase busbars are inserted into the sealing hole (321), and the hole wall of the sealing hole (321) is in sealing contact with the three-phase busbars.

10. The inverter according to claim 9, wherein, Each phase busbar includes a positive busbar (21) and a negative busbar (22), which are stacked in parallel along the width direction of the sealing hole (321).

11. The inverter according to claim 10, wherein, Each phase busbar also includes an insulation layer (23), which is disposed between the positive busbar (21) and the negative busbar (22), and the insulation layer (23) in the three phase busbars is integrally disposed.

12. A motor controller, comprising an inverter as claimed in any one of claims 9-11, or a seal as claimed in any one of claims 1-8.

13. An electric drive system comprising a motor controller as claimed in claim 12, an inverter as claimed in any one of claims 9-11, or a seal as claimed in any one of claims 1-8.

14. A vehicle comprising an electric drive system as claimed in claim 13, or a motor controller as claimed in claim 12, or an inverter as claimed in any one of claims 9-11, or a seal as claimed in any one of claims 1-8.

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