Stator assembly, motor and vehicle

Abstract

The utility model provides a stator assembly, a motor and a vehicle, the stator assembly comprises a stator winding, a stator core and a mixed cooling structure, the stator core is arranged around the stator winding, the mixed cooling structure is arranged on the outer side of the stator core and is provided with a cooling cavity and a cooling medium inlet, and the cooling cavity is used for accommodating a cooling medium and part of the stator winding; the cooling medium inlet serves as a channel for a cooling medium to enter the cooling cavity; the hybrid cooling structure also has an immersion region remote from the cooling medium inlet in which the cooling medium can accumulate to cool a portion of the stator winding. According to the hybrid cooling structure, the motor and the vehicle provided by the invention, the end winding can be fully and uniformly cooled.

Description

Technical Field

[0001] This application relates to the field of cooling technology, and more particularly to a stator assembly, motor, and vehicle. Background Technology

[0002] During motor operation, the end windings generate heat, thus requiring cooling. The industry commonly uses a spray cooling method for this purpose. However, this method struggles to achieve uniform cooling of the end windings, particularly in the bottom region. Utility Model Content

[0003] This application provides a stator assembly, motor, and vehicle capable of achieving sufficient and uniform cooling of the end windings.

[0004] To achieve the above objectives, in a first aspect, this application provides a stator assembly, which includes a stator winding, a stator core, and a hybrid cooling structure. The stator core is disposed around the stator winding, and the hybrid cooling structure is disposed outside the stator core and has a cooling cavity and a cooling medium inlet. The cooling cavity is used to accommodate the cooling medium and a portion of the stator winding, and the cooling medium inlet serves as a channel for the cooling medium to enter the cooling cavity. The hybrid cooling structure also has an immersion region, which is far from the cooling medium inlet, and the cooling medium can accumulate in the immersion region to cool a portion of the stator winding.

[0005] In some embodiments of this application, the line connecting any point on the immersion region and the center point of the hybrid cooling structure forms an angle α1 with the direction of gravity, wherein the angle α1 satisfies: 90°<α1≤180°.

[0006] In some embodiments of this application, the immersion region is symmetrically arranged about the centerline of the hybrid cooling structure.

[0007] In some embodiments of this application, the lines connecting any two points within the immersion area to the center point of the hybrid cooling structure form an angle α2, where the angle α2 satisfies: 0° < α2 ≤ 120°.

[0008] In some embodiments of this application, the hybrid cooling structure is provided with a cooling medium outlet, which is connected to the cooling chamber and located in the immersion region.

[0009] In some embodiments of this application, along a direction perpendicular to the horizontal plane, the lowest point of the cooling medium outlet is higher than the highest point of the component to be cooled within the immersion area.

[0010] In some embodiments of this application, the hybrid cooling structure includes a main body, a cooling medium inlet and a cooling medium outlet disposed on the main body, and the cooling medium outlet is disposed close to the inner wall of the hybrid cooling structure.

[0011] In some embodiments of this application, the hybrid cooling structure includes a main body and a protrusion, the protrusion being located within the immersion region and connected to the main body; the protrusion extends from the main body toward the center of the hybrid cooling structure, and the cooling medium outlet is located on the protrusion.

[0012] In some embodiments of this application, the cooling medium outlet is also located on the main body portion connected to the protrusion.

[0013] In some embodiments of this application, the opening direction of the cooling medium inlet is the same as the radial direction Y of the hybrid cooling structure, and the opening direction of the cooling medium outlet is the same as the axial direction X of the hybrid cooling structure and extends from the outer wall of the hybrid cooling structure to the inner wall of the hybrid cooling structure.

[0014] In some embodiments of this application, there are multiple cooling medium inlets; the cross-sectional area of ​​the cooling medium outlet in the radial direction Y parallel to the hybrid cooling structure is greater than the sum of the cross-sectional areas of the multiple cooling medium inlets in the axial direction X parallel to the hybrid cooling structure.

[0015] In some embodiments of this application, the extension direction of the cooling medium inlet and the gravity direction of the cooling medium flowing through the cooling medium inlet form an angle θ, which satisfies: 0°≤θ≤90°.

[0016] In some embodiments of this application, the main body includes a first inner wall, a first outer wall and a first connecting wall. The first inner wall is connected end to end, the first outer wall is connected end to end and is disposed around the first inner wall, and the first connecting wall connects the first inner wall and the first outer wall. The first inner wall, the first outer wall and the first connecting wall constitute a cooling cavity, and the cooling medium inlet is disposed on the first outer wall.

[0017] In some embodiments of this application, the protrusion is fixed to the first inner wall of the main body located in the immersion region and connected to the first connecting wall located outside the immersion region.

[0018] In some embodiments of this application, the protrusion includes a second inner wall, a second outer wall, and a second connecting wall. The second inner wall extends radially from the first inner wall along the hybrid cooling structure. The second outer wall is connected to the first outer wall and extends radially from the first outer wall along the hybrid cooling structure. The second connecting wall connects the second inner wall and the second outer wall and is parallel to the first inner wall. The cooling medium outlet extends from the second outer wall to the second inner wall.

[0019] In some embodiments of this application, the second outer wall protrudes from the first connecting wall in the extending direction of the cooling medium outlet.

[0020] In some embodiments of this application, the cooling structure has a highest point and a lowest point in the radial direction Y of the hybrid cooling structure, and has a centerline passing through the highest point and the lowest point; the cooling medium inlet and the cooling medium outlet are symmetrically arranged about the centerline.

[0021] In some embodiments of this application, the hybrid cooling structure further includes a connecting plate, which is connected to the main body and protrudes from the main body in the radial direction Y of the hybrid cooling structure. The connecting plate is configured to be sealed to the housing of the motor.

[0022] In some embodiments of this application, the hybrid cooling structure further includes two baffles, which are respectively connected to the outer periphery of the main body and to the connecting plate; the cooling medium inlet is located between the two baffles, and the cooling medium inlet and the cooling medium outlet are located on both sides of the two baffles in the radial Y direction of the hybrid cooling structure.

[0023] In some embodiments of this application, there are multiple cooling medium inlets, which are spaced apart.

[0024] In some embodiments of this application, the distance between two adjacent cooling medium inlets near the immersion region is greater than the distance between two adjacent cooling medium inlets far from the immersion region.

[0025] In some embodiments of this application, the main body also has a collection port, which is connected to the cooling cavity and located near the cooling medium outlet; the collection port is used to collect the cooling medium outside the mixing cooling structure into the cooling cavity.

[0026] In some embodiments of this application, the collection port is located on the first inner wall, and the opening of the collection port faces the radial direction Y of the mixing cooling structure.

[0027] In some embodiments of this application, the stator assembly further includes a housing, and the stator core is disposed inside the housing; the connecting plate and the first outer wall respectively abut against the housing to form a cavity; the cavity communicates with the cooling cavity through a cooling medium inlet and is used to contain the cooling medium.

[0028] In some embodiments of this application, the stator winding includes an end winding located within a cooling cavity.

[0029] In some embodiments of this application, the outer shell has an injection port that communicates with the cavity and serves as a channel for the cooling medium to enter the cavity.

[0030] Secondly, this application also provides an electric motor, which includes the stator assembly described above.

[0031] Thirdly, this application also provides a vehicle, which includes the above-mentioned motor or the above-mentioned hybrid cooling structure.

[0032] The hybrid stator assembly, motor, and vehicle provided in this application include a stator assembly comprising a stator winding, a stator core, and a hybrid cooling structure. The stator core is arranged around the stator winding, and the hybrid cooling structure is arranged outside the stator core and has a cooling cavity and a cooling medium inlet. The cooling cavity is used to accommodate the cooling medium and part of the stator winding, and the cooling medium inlet serves as a channel for the cooling medium to enter the cooling cavity. The hybrid cooling structure also has an immersion region, which is far from the cooling medium inlet, and the cooling medium can accumulate in the immersion region to cool a part of the stator winding. The hybrid cooling structure works in conjunction with the motor housing to place the end winding (the part to be cooled) inside the cooling chamber. The cooling medium can enter the cooling chamber through the cooling medium inlet and flow through the cooling chamber to the immersion area. The part of the end winding (the part to be cooled) near the cooling medium inlet can be cooled by spraying inside the cooling chamber, while the part of the end winding (the part to be cooled) located in the immersion area can be cooled by wetting inside the cooling chamber. Thus, the end winding is cooled by a hybrid method of spraying and wetting, so as to achieve sufficient and uniform cooling of the end winding. This alleviates to some extent the problem of insufficient cooling of the bottom area of ​​the end winding in the pure spray cooling scheme.

[0033] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0036] Figure 1 This is a three-dimensional schematic diagram of a hybrid cooling structure provided for some exemplary embodiments of this application.

[0037] Figure 2 for Figure 1 A three-dimensional schematic diagram of the hybrid cooling structure from another angle.

[0038] Figure 3 A perspective view of another hybrid cooling structure provided for some exemplary embodiments of this application.

[0039] Figure 4 for Figure 3 A three-dimensional schematic diagram of the hybrid cooling structure from another angle.

[0040] Figure 5 A schematic diagram of an electric motor provided for some exemplary embodiments of this application (only half of the hybrid cooling structure is shown).

[0041] Figure 6 This is a schematic diagram of a vehicle module provided for some exemplary embodiments of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1000, Vehicle; 1100, Motor; 100, Stator Assembly; 110 / 120, Hybrid Cooling Structure; 300, Stator Winding; 310, End Winding; 320, Slot Winding; 400, Stator Core; 500, Housing; 111, Immersion Area; 10, Cooling Medium Inlet; 20, Cooling Chamber; 30, Cooling Medium Outlet; 41, Main Body; 42, Protrusion; 411, First Inner Wall; 412, First Outer Wall; 413, First Connecting Wall; 421, Second Inner Wall; 422, Second Outer Wall; 423, Second Connecting Wall; M, Highest Point; N, Lowest Point; L, Centerline; Q, First Endpoint; P, Second Endpoint; 50, Connecting Plate; 60, Baffle Plate; 43, Collection Port; 71, Injection Port; 72, Cavity; 44, First Inner Cavity; 401, Second Inner Cavity. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0045] Please see Figure 1 and Figure 2 This application provides a stator assembly 100, which includes a hybrid cooling structure 110, a stator winding 300, and a stator core 400. The stator core 400 is disposed around the stator winding 300. The hybrid cooling structure 110 is disposed outside the stator core 400 and has at least one cooling medium inlet 10 and a cooling cavity 20. The cooling cavity 20 is used to accommodate the cooling medium and a portion of the stator winding 300. The cooling medium inlet 10 serves as a channel for the cooling medium to enter the cooling cavity 20. The hybrid cooling structure 110 has an immersion region 111, which is located away from the cooling medium inlet 10. The cooling medium can accumulate in the immersion region 111 to cool the component to be cooled.

[0046] Specifically, the immersion region 111 refers to a part of the cooling cavity 20 of the hybrid cooling structure 110, which can accumulate and store the cooling medium, ensuring that the cooling medium sufficiently cools a part (the component to be cooled) of the stator winding 300. Taking the cooling medium inlet 10 located at the upper part of the hybrid cooling structure 110 as an example, the angle α1 between the gravitational direction G1 of any point on the immersion region 111 and the radial direction Y of the hybrid cooling structure 110 passing through that point satisfies: 90° < α1 ≤ 180°. That is, the line connecting any point on the immersion region 111 and the center point of the hybrid cooling structure 110 forms an angle α1 with the gravitational direction G, and the angle α1 satisfies: 90° < α1 ≤ 180°. The immersion region 111 is located at the lower part of the hybrid cooling structure 110, which facilitates the smooth flow of the cooling medium from the cooling medium inlet 10 from the upper part of the hybrid cooling structure 110 into the cooling cavity 20 at the lower part of the hybrid cooling structure 110, i.e., into the immersion region 111. In some embodiments of this application, the hybrid cooling structure 110 has a highest point M, a lowest point N, and a center line L. The center line L passes through the highest point M and the lowest point N of the hybrid cooling structure 110, and the immersion region 111 is symmetrically arranged about the center line L. That is, the immersion region 111 is distributed from the lowest point N of the hybrid cooling structure 110 to its opposite sides. This is because the liquid level of the cooling medium in the immersion region 111 eventually tends to be flush (parallel to the horizontal plane).

[0047] In some embodiments of this application, on a cross section of the hybrid cooling structure 110 perpendicular to the axial direction X of the hybrid structure, the immersion region 111 has a first endpoint Q and a second endpoint P. Both the first endpoint Q and the second endpoint P are far from the lowest point N of the hybrid cooling structure 110 and are symmetrically arranged about the centerline L. That is, the immersion region 111 is symmetrically arranged about the centerline L of the hybrid cooling structure 110. The radial directions Y of the hybrid cooling structure 110 passing through the first endpoint Q and the second endpoint P respectively form an angle α2. In other words, the lines connecting any two points within the immersion region 111 to the center point of the hybrid cooling structure 110 form an angle α2, which satisfies: 0° < α2 ≤ 120°. Considering that during the process of the cooling medium from the cooling medium inlet 10 flowing from the upper part of the mixed cooling structure 110 to the immersion region 111, the cooling medium from the cooling medium inlet 10, especially the part of the cooling medium from the cooling medium inlet 10 near the immersion region 111, will cool the part of the component to be cooled near the cooling medium inlet 10, the immersion region 111 does not need to be set in the entire lower region of the mixed cooling structure 110. 0°<α2≤120° is more suitable, which can achieve a better cooling effect and reduce costs.

[0048] In some embodiments of this application, the cooling medium inlet 10 is a spray nozzle, and the cooling medium is sprayed into the cooling chamber 20 from the cooling medium inlet 10 and flows into the immersion region 111 from the cooling medium inlet 10 along the cooling chamber 20 and accumulates in the immersion region 111.

[0049] In some embodiments of this application, there are multiple cooling medium inlets 10, and the multiple cooling medium inlets 10 are distributed at intervals on the hybrid cooling structure 110.

[0050] In some embodiments of this application, the distance between two adjacent cooling medium inlets 10 near the immersion region 111 is greater than the distance between two adjacent cooling medium inlets 10 far from the immersion region 111. That is, the closer to the top of the hybrid cooling structure, the greater the density of the cooling medium inlets 10, which is beneficial to obtaining a better spray cooling effect.

[0051] The hybrid cooling structure 110 cooperates with the stator winding 300 and the stator core 400 to place the part to be cooled (e.g., a part of the stator winding, the end winding) of the stator assembly 100 in the cooling cavity 20. The cooling medium can enter the cooling cavity 20 from the cooling medium inlet 10 and flow through the cooling cavity 20 to the immersion region 111 and accumulate in the immersion region 111. The part of the end winding (the part to be cooled) near the cooling medium inlet 10 can be cooled by spraying in the cooling cavity 20 outside the immersion region 111. The part of the end winding (the part to be cooled) away from the cooling medium inlet 10 and located in the immersion region 111 can be cooled by wetting by the cooling medium accumulated in the immersion region 111. Thus, the hybrid cooling structure provided in this application can use spraying and wetting to perform mixed cooling of the end winding to achieve sufficient and uniform cooling of the end winding, which to a certain extent alleviates the problem of insufficient cooling of the bottom area of ​​the end winding in the pure spray cooling scheme.

[0052] In the hybrid cooling structure 110, along the radial Y direction, the cooling medium sprayed from the cooling medium inlet 10 into the cooling chamber 20 flows downwards along the cooling chamber 20 by its own gravity to the lower half of the cooling chamber 20, that is, into the immersion region 111 of the hybrid cooling structure 110, and accumulates in the immersion region 111. The cooling medium accumulated in the immersion region 111 can wet and cool the component to be cooled (e.g., the end winding) located in the cooling chamber 20. That is, the part of the component to be cooled (e.g., the end winding) near the cooling medium inlet 10 is cooled by spraying, while the part located in the immersion region 111 is cooled by immersion.

[0053] Please refer to it again. Figure 2In some embodiments of this application, the cooling medium inlet 10 extends radially Y along the hybrid cooling structure 110, and the angle θ between the extension direction X of the cooling medium inlet 10 and the gravitational direction G of the cooling medium flowing through the cooling medium inlet 10 satisfies: 0°≤θ≤90°. That is to say, the cooling medium inlet 10 is only distributed in the upper half of the hybrid cooling structure 110, and the spray direction of the cooling medium flowing through the cooling medium inlet 10 is all downward or obliquely downward. The cooling medium flowing through the cooling medium inlet 10 will not spray against the direction of gravity. In this way, it can be ensured that the cooling medium flowing through the cooling medium inlet 10 can flow more smoothly into the cooling chamber 20, which is conducive to achieving immersion cooling.

[0054] In some embodiments of this application, the hybrid cooling structure 110 is provided with a cooling medium outlet 30, which communicates with the cooling cavity 20. In the radial direction Y of the hybrid cooling structure 110, the cooling medium outlet 30 is located within the immersion region 111, that is, in the bottom region of the hybrid cooling structure 110. By placing the cooling medium outlet 30 in the bottom region of the hybrid cooling structure 110, the cooling medium after the cooling end winding and whose temperature has risen to a preset temperature can be discharged from the cooling cavity 20.

[0055] In some embodiments of this application, there are multiple cooling medium inlets 10, and the flow area of ​​the cooling medium outlet 30 is greater than the total flow area of ​​the multiple cooling medium inlets 10. That is, the cross-sectional area of ​​the cooling medium outlet 30 in the radial Y direction parallel to the mixing cooling structure 110 is greater than the sum of the cross-sectional areas of the multiple cooling medium inlets in the axial X direction parallel to the mixing cooling structure 110. This helps ensure that the cooling medium flows out axially from the cooling medium outlet 30, preventing the cooling medium from overflowing from other areas and contaminating other areas of the motor.

[0056] The flow area of ​​the cooling medium outlet 30 refers to the effective flow area of ​​the cooling medium when it passes through the cooling medium outlet 30.

[0057] In some embodiments of this application, in the radial Y direction of the hybrid cooling structure 110, that is, in the direction perpendicular to the horizontal plane, the lowest point of the cooling medium outlet 30 is higher than the highest point of the component to be cooled (end winding 310) located in the immersion region 111. This facilitates the accumulation of cooling medium in the cooling cavity 20 and helps to ensure that the cooling medium immerses the end winding.

[0058] In some embodiments of this application, in the radial Y direction of the hybrid cooling structure 110, the minimum distance H1 from the cooling medium outlet 30 to the first outer wall 412 of the hybrid cooling structure 110 (see below) is greater than or equal to the maximum distance H2 from the cooling cavity 20 to the first outer wall 412. That is, the lowest point of the cooling medium outlet 30 is equal to or higher than the highest point of the cooling cavity 20 at that location. Since the part to be cooled is housed within the cooling cavity 20, generally speaking, the height of the part to be cooled in the radial Y direction of the hybrid cooling structure 110 is slightly less than the height of the cooling cavity 20. Thus, when new cooling medium is sprayed from the cooling medium inlet 10 into the cooling cavity 20, the cooling medium whose temperature has risen to a preset temperature can flow out from the cooling medium outlet 30, and the new cooling medium can completely immerse the part to be cooled (end winding), resulting in a better cooling effect.

[0059] In some embodiments of this application, the hybrid cooling structure 110 includes a main body 41 and a protrusion 42. The protrusion 42 is located within the immersion region 111 and connected to the main body 41. The protrusion 42 extends from the main body 41 toward the center of the hybrid cooling structure 110. The cooling medium outlet is located on the protrusion 42 and is disposed close to the inner wall of the hybrid cooling structure 110, where the inner wall refers to the first inner wall 411. In this way, the cooling medium outlet 30 is positioned relatively high, and the cooling medium in the cooling cavity 20 is less likely to overflow from the cooling medium outlet 30, which is beneficial for the accumulation of the cooling medium in the cooling cavity 20 and for achieving complete immersion cooling.

[0060] Specifically, the protrusion 42 is located on the first inner wall 411 of the hybrid cooling structure 110 and is connected to the first outer wall 412 of the hybrid cooling structure 110. In this embodiment, the protrusion 42 is integrally formed with the main body 41.

[0061] In other embodiments of this application, a portion of the cooling medium outlet 30 is located on the protrusion 42, and another portion is located on the main body portion 41 connected to the protrusion 42.

[0062] In other embodiments of this application, the hybrid cooling structure 110 includes a main body 41, with a cooling medium outlet 30 and a cooling medium inlet 10 respectively disposed on the main body 41. The cooling medium outlet 30 is disposed close to the first inner wall 411 (see below) of the hybrid cooling structure 110. Thus, the position of the cooling medium outlet 30 has little effect on the accumulation of cooling medium in the immersion region 111.

[0063] In some embodiments of this application, the opening direction of the cooling medium inlet 10 is the same as the radial direction Y of the mixing cooling structure 110, and the opening direction of the cooling medium outlet 30 is the same as the axial direction X of the mixing cooling structure 110 and extends from the first outer wall 412 to the first inner wall 411 of the mixing cooling structure 110. This arrangement facilitates the opening of the cooling medium outlet 30 and the cooling medium inlet 10, and helps to ensure that the cooling medium flows from the cooling medium outlet 30 to the outside of the mixing cooling structure, preventing the cooling medium from overflowing from other areas of the mixing cooling structure and contaminating other areas of the motor.

[0064] The main body 41 is connected end to end and surrounds to form a first inner cavity 44. The first inner cavity 44 is spaced apart from and insulated from the cooling cavity 20. The axial direction X of the first inner cavity 44 is the same as the axial direction X of the hybrid cooling structure 110, and the radial direction Y of the first inner cavity 44 is the same as the radial direction Y of the hybrid cooling structure 110.

[0065] In some embodiments of this application, the thickness of the main body 41 in the radial Y direction of the hybrid cooling structure 110 is approximately equal. This ensures that the spray area of ​​each cooling medium inlet 10 is approximately the same, and the cooling effect of each cooling medium inlet 10 on the component to be cooled is basically the same. The opening direction of the cooling medium outlet 30 is the same as the axial direction X of the hybrid cooling structure 110, which is beneficial for the accumulation of cooling medium in the cooling chamber 20.

[0066] In some embodiments of this application, the main body 41 includes a first inner wall 411, a first outer wall 412, and a first connecting wall 413. The first inner wall 411 is connected end to end, the first outer wall 412 is connected end to end and is disposed around the first inner wall 411, and the first connecting wall 413 connects the first inner wall 411 and the first outer wall 412. The first inner wall 411, the first outer wall 412, the first connecting wall 413, and the stator core 400 constitute a cooling cavity 20, and the cooling medium inlet 10 is disposed on the first outer wall 412.

[0067] In some embodiments of this application, the protrusion 42 includes a second inner wall 421, a second outer wall 422, and a second connecting wall 423. The second inner wall 421 extends radially Y from the first inner wall 411 along the hybrid cooling structure 110. The second outer wall 422 is connected to the first outer wall 412 and extends radially Y from the first outer wall 412 along the hybrid cooling structure 110. The second connecting wall 423 connects the second inner wall 421 and the second outer wall 422 and is parallel to the first inner wall 411. The cooling medium outlet 30 extends from the second outer wall 422 toward the second inner wall 421.

[0068] In some embodiments of this application, the thickness of the first connecting wall 413 and the second outer wall 422 located within the immersion region 111 in the axial X direction of the hybrid cooling structure 110 is greater than the thickness of the first connecting wall 413 located outside the immersion region 111 in the axial X direction of the hybrid cooling structure 110. That is, the second outer wall 422 protrudes from the first connecting wall 413. Since the cooling medium outlet 30 is located on the second outer wall 422 of the protrusion 42, when the cooling medium flows out from the cooling medium outlet 30, if the medium flow rate is too high, it will have a certain impact on the second outer wall 422 of the protrusion 42. Therefore, thickening the thickness of the second outer wall 422 and the first connecting wall 413 in the axial X direction of the hybrid cooling structure 110 can enhance the mechanical strength at this location.

[0069] In some embodiments of this application, the cooling structure has a highest point M and a lowest point N, and a center line L passing through the highest point M and the lowest point N; the cooling medium inlet 10 and the cooling medium outlet 30 are symmetrically arranged about the center line L. In this way, it can be ensured that the cooling medium outlet 30 is located at the bottom of the mixed cooling structure 110, which is conducive to the accumulation of cooling medium in the immersion region 111 to achieve immersion cooling.

[0070] In some embodiments of this application, the hybrid cooling structure 110 further includes a connecting plate 50, which is connected to the main body 41 and protrudes from the main body 41 radially Y-shaped along the hybrid cooling structure 110. The connecting plate 50 is configured to be sealed to the motor housing and forms a cavity 72 with the motor housing and the first outer wall 412 of the main body 41. The cavity 72 can temporarily contain the cooling medium and guide the cooling medium to a plurality of cooling medium inlets 10, so that the cooling medium can be sprayed into the cooling chamber 20 from the cooling medium inlets 10.

[0071] In this embodiment, the connecting plate 50 is annular.

[0072] In some embodiments of this application, the main body 41 also has a collection port 43, which is connected to the cooling cavity 20 and located near the cooling medium outlet 30; the collection port 43 is used to collect the cooling medium outside the mixing cooling structure 110 into the cooling cavity 20 to avoid waste of the cooling medium.

[0073] In some embodiments of this application, the collection port 43 is located on the first inner wall 411, and the opening of the collection port 43 faces the radial Y direction of the mixing cooling structure 110 and communicates with the cavity 72. In this way, it is not only beneficial for the cooling medium located in the cavity 72 or the inner cavity of the stator core of the motor to flow into the cooling cavity 20 through the collection port 43 to avoid waste of the cooling medium, but also does not affect the accumulation of the cooling medium.

[0074] Please see Figure 3 and Figure 4This application also provides a hybrid cooling structure 120, which is basically the same as the hybrid cooling structure 110, except that the hybrid cooling structure 110 further includes two baffle plates 60, which are respectively connected to the outer periphery of the main body 41 and to the third connecting plate 50; the cooling medium inlet 10 is located between the two baffle plates 60, and the cooling medium inlet 10 and the cooling medium outlet 30 are located on both sides of the two baffle plates 60 in the radial Y direction of the hybrid cooling structure 110. The baffle plates 60 can confine the cooling medium in the cavity 72 to the upper half of the hybrid cooling structure 110.

[0075] In this embodiment, the connecting plate 50 is semi-circular.

[0076] In some embodiments of this application, the stator assembly 100 further includes a housing 500, which surrounds the stator core 400, i.e., the stator core 400 is disposed within the housing 500; the end winding 310 protrudes from the stator core 400; the main body 41 of the hybrid cooling structure 110 or 120 abuts against the stator core 400 and the housing 500 respectively to form a cavity 72; the cavity 72 communicates with the cooling chamber 20 through the cooling medium inlet 10 and is used to accommodate and guide the cooling medium to spray into the cooling chamber 20 through the cooling medium inlet 10. Specifically, the connecting plate 50 of the hybrid cooling structure 110 or 120 abuts against the housing 500, and the main body 41 (first inner wall 411 and first outer wall 412) of the hybrid cooling structure 110 or 120 abuts against the stator core 400, which can, to a certain extent, solve the problem of the difficulty in sealing the stator tooth slot when immersing cooling the end winding. The stator slot is a groove on the stator core of the motor used to accommodate the stator windings. The first outer wall 412 and the first inner wall 411 of the main body 41 of the hybrid cooling structure 110 or 120 abut against the stator core 400 to seal the cooling cavity 20. This not only allows the cooling medium to flow into the immersion area 111 within the cooling cavity 20 by its own gravity for smooth spray cooling, but also prevents the coolant from flowing to other areas of the motor and contaminating other components.

[0077] The stator winding 300 also includes an in-slot winding 320, and an end winding 310 is connected to the end of the in-slot winding 320. The stator core 400 has a second inner cavity 401, the axial direction X of the second inner cavity 401 is the same as the axial direction X of the hybrid cooling structure 110, and the in-slot winding 320 is embedded in the slot of the stator core 400 and faces the second inner cavity 401.

[0078] In some embodiments of this application, the outer casing 500 has an injection port 71, which communicates with the cavity 72 and serves as a channel for the cooling medium to enter the cavity 72.

[0079] Please see Figure 5Secondly, this application also provides an electric motor 1100, which includes a stator assembly 100.

[0080] The motor 1100 also includes components such as a rotor, which will not be described in detail here.

[0081] Please see Figure 6 Thirdly, this application also provides a vehicle 1000, which includes the motor 1100 or the stator assembly 100 as described above.

[0082] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0083] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0084] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0085] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although the descriptions of each embodiment in this application have different focuses, and the parts not described in detail in a certain embodiment can be referred to the relevant embodiments in other embodiments, any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A stator assembly, characterized in that, include: Stator windings; and A stator core is arranged around the stator winding; A hybrid cooling structure is provided on the outside of the stator core and has a cooling cavity and a cooling medium inlet. The cooling cavity is used to accommodate the cooling medium and part of the stator winding, and the cooling medium inlet serves as a channel for the cooling medium to enter the cooling cavity. The hybrid cooling structure also has an immersion region, which is far from the cooling medium inlet, and the cooling medium can accumulate in the immersion region to cool the stator winding.

2. The stator assembly as claimed in claim 1, characterized in that, The line connecting any point on the immersion area and the center point of the hybrid cooling structure forms an angle α1 with the direction of gravity, wherein the angle α1 satisfies: 90°<α1≤180°.

3. The stator assembly as described in claim 2, characterized in that, The immersion region is symmetrically arranged about the centerline of the hybrid cooling structure.

4. The stator assembly as claimed in claim 3, characterized in that, The line connecting any two points within the immersion area to the center point of the hybrid cooling structure forms an angle α2, wherein the angle α2 satisfies: 0° < α2 ≤ 120°.

5. The stator assembly as described in any one of claims 1-4, characterized in that, The hybrid cooling structure is provided with a cooling medium outlet, which is connected to the cooling cavity and located in the immersion area.

6. The stator assembly as claimed in claim 5, characterized in that, Along the direction perpendicular to the horizontal plane, the lowest point of the cooling medium outlet is higher than the highest point of the stator winding located within the immersion region.

7. The stator assembly as claimed in claim 6, characterized in that, The hybrid cooling structure includes a main body, and the cooling medium inlet and the cooling medium outlet are disposed on the main body, with the cooling medium outlet disposed near the inner wall of the hybrid cooling structure.

8. The stator assembly as claimed in claim 6, characterized in that, The hybrid cooling structure includes a main body and a protrusion, the protrusion being located within the immersion area and connected to the main body; The protrusion extends from the main body toward the center of the hybrid cooling structure, and the cooling medium outlet is located on the protrusion.

9. The stator assembly as claimed in claim 8, characterized in that, The cooling medium outlet is also located on the main body portion connected to the protrusion.

10. The stator assembly as claimed in claim 5, characterized in that, The opening direction of the cooling medium inlet is the same as the radial direction of the hybrid cooling structure, and the opening direction of the cooling medium outlet is the same as the axial direction of the hybrid cooling structure, extending from the outer wall of the hybrid cooling structure to the inner wall of the hybrid cooling structure.

11. The stator assembly as claimed in claim 5, characterized in that, The cooling medium inlet has multiple inlets; The cross-sectional area of ​​the cooling medium outlet is greater than the sum of the cross-sectional areas of the plurality of cooling medium inlets.

12. The stator assembly as claimed in any one of claims 1-4, characterized in that, The extension direction of the cooling medium inlet forms an angle θ with the gravitational direction of the cooling medium flowing through the cooling medium inlet, and the angle θ satisfies: 0°≤θ≤90°.

13. The stator assembly as claimed in claim 8, characterized in that, The main body (41) includes: The first inner wall is connected end to end; A first outer wall, connected end to end and arranged around the first inner wall; and A first connecting wall connects the first inner wall and the first outer wall; The cooling cavity is formed by the first inner wall, the first outer wall, the first connecting wall, and the stator core, and the cooling medium inlet is located on the first outer wall.

14. The stator assembly as claimed in claim 13, characterized in that, The protrusion is fixed to the first inner wall of the main body located in the immersion area and connected to the first connecting wall located outside the immersion area.

15. The stator assembly as claimed in claim 13, characterized in that, The protrusion includes: The second inner wall extends radially from the first inner wall along the hybrid cooling structure; A second outer wall, connected to the first outer wall and extending radially from the first outer wall along the hybrid cooling structure; and The second connecting wall connects the second inner wall and the second outer wall and is parallel to the first inner wall; The cooling medium outlet extends from the second outer wall to the second inner wall.

16. The stator assembly as claimed in claim 15, characterized in that, In the extending direction of the cooling medium outlet, the second outer wall protrudes from the first connecting wall.

17. The stator assembly as claimed in claim 5, characterized in that, In the radial direction of the hybrid cooling structure, the hybrid cooling structure has a highest point and a lowest point, and has a centerline passing through the highest point and the lowest point; The cooling medium inlet and the cooling medium outlet are symmetrically arranged about the center line.

18. The stator assembly as claimed in claim 13, characterized in that, The hybrid cooling structure also includes: A connecting plate, connected to the first outer wall and protruding radially from the main body along the hybrid cooling structure, is configured to be sealed to the motor housing.

19. The stator assembly as claimed in claim 18, characterized in that, The hybrid cooling structure also includes: Two baffles are respectively connected to the main body and to the connecting plate; The cooling medium inlet is located between the two baffles, and the cooling medium inlet and the cooling medium outlet are located on both sides of the two baffles in the radial direction of the hybrid cooling structure.

20. The stator assembly as claimed in any one of claims 1-4, characterized in that, The cooling medium inlets are multiple, and the multiple cooling medium inlets are spaced apart.

21. The stator assembly as claimed in claim 20, characterized in that, The distance between two adjacent cooling medium inlets closer to the immersion area is greater than the distance between two adjacent cooling medium inlets farther from the immersion area.

22. The stator assembly as claimed in claim 13, characterized in that, The main body also has a collection port, which is connected to the cooling cavity and located near the outlet of the cooling medium. The collection port is used to collect the cooling medium outside the hybrid cooling structure into the cooling cavity.

23. The stator assembly as claimed in claim 22, characterized in that, The collection port is located on the first inner wall, and the opening of the collection port faces the radial direction of the hybrid cooling structure.

24. The stator assembly as claimed in claim 18, characterized in that, The stator assembly also includes a housing, and the stator core is disposed within the housing; The connecting plate and the first outer wall abut against the outer shell to form a cavity; the cavity is connected to the cooling cavity through the cooling medium inlet and is used to contain the cooling medium.

25. The stator assembly as claimed in claim 1, characterized in that, The stator winding includes an end winding, which is located within the cooling cavity.

26. The stator assembly as claimed in claim 24, characterized in that, The outer casing has an injection port that communicates with the cavity and serves as a channel for the cooling medium to enter the cavity.

27. An electric motor, characterized in that, include: The stator assembly as described in any one of claims 1-26.

28. A vehicle, characterized in that, include: The motor as claimed in claim 27 or the stator assembly as claimed in any one of claims 1-26.

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