Stator assembly, motor, power assembly and vehicle

Abstract

The embodiment of the invention provides a stator assembly, a motor, a power assembly and a vehicle. The stator assembly comprises a stator core; the sealing cover is arranged at the end part of the stator iron core; the sealing structure is connected between the end part of the stator core and the sealing cover; wherein the sealing structure comprises a sealing part and a limiting part, the sealing part comprises a first side and a second side which are opposite in the axial direction, and the first side is in surface contact with the end part of the stator core; the limiting part protrudes out of the second side and is connected with the sealing cover in an inserted mode. In the embodiment of the invention, the sealing part can be in surface contact with the end part of the stator iron core through the first side, so that the sealing performance of the connection between the sealing part and the stator iron core is conveniently ensured, and the cooling oil is further prevented from leaking from the space between the sealing part and the stator iron core. Moreover, the sealing structure and the stator iron core can be prepared separately and fixed through splicing, and the cost of independently preparing the sealing structure and the stator iron core can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor sealing, and in particular to a stator assembly, a motor, a power assembly and a vehicle. Background Art

[0002] The temperature rise of the motor is directly related to the performance and life of the motor. At present, direct oil cooling of the motor is usually used to suppress the temperature rise of the motor. However, the motor as a whole is immersed in the oil, resulting in direct contact between the motor rotor and the cooling oil, which will greatly increase the resistance to the rotation of the rotor. At present, the end of the stator core is connected to the sealing cover to enclose and form a cooling cavity, and a sealing ring is added at the connection between the sealing cover and the inner ring of the stator core to prevent the cooling oil from flowing from the inner ring of the stator core to the rotor.

[0003] However, a protruding tooth is provided at one end of the sealing ring facing the stator core, a notch is provided correspondingly on the stator core, and the protruding tooth is inserted into the notch. When the gap between the protruding tooth and the notch is matched, oil leakage is easy to occur. When the protruding tooth and the notch are integrally injection molded, the process cost is relatively high. Summary of the invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a stator assembly, a motor, a powertrain, and a vehicle that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problems, in a first aspect, an embodiment of the present invention discloses a stator assembly, comprising:

[0006] stator core;

[0007] A sealing cover is arranged at the end of the stator core;

[0008] A sealing structure connected between the end of the stator core and the sealing cover;

[0009] Wherein, the sealing structure includes a sealing portion and a limiting portion, the sealing portion includes a first side and a second side opposite to each other along the axial direction of the stator core, the first side is in contact with the end surface of the stator core; the limiting portion protrudes from the second side, and the limiting portion is plugged into the sealing cover.

[0010] Optionally, the stator core encloses a rotor accommodating space penetrating along the axial direction, the sealing portion is provided with a first through hole penetrating along the axial direction, and the limiting portion is provided with a second through hole penetrating along the axial direction;

[0011] The second through hole, the first through hole, and the rotor accommodating space are sequentially connected along the axial direction.

[0012] Optionally, the sealing portion is provided with a first avoidance structure, the first avoidance structure comprising a plurality of first avoidance holes penetrating along the axial direction for windings to pass through, the first avoidance holes extending toward the center of the first through hole, and the plurality of first avoidance holes being arranged at intervals along the circumference of the sealing portion.

[0013] Optionally, the sealing portion is provided with a cooling structure, and the first cooling structure is provided on a side of the first avoidance structure away from the first through hole;

[0014] The first cooling structure comprises a plurality of first cooling channels extending in the axial direction, and the plurality of first cooling channels are arranged at intervals in the circumferential direction of the sealing portion;

[0015] The first cooling channel is disposed close to the first avoidance hole.

[0016] Optionally, the sealing portion is further provided with a second cooling structure, and the second cooling structure is provided on a side of the first cooling structure away from the first avoidance structure;

[0017] The second cooling structure comprises a plurality of second cooling channels extending along the axial direction, and the plurality of second cooling channels are arranged at intervals along the circumference of the sealing portion;

[0018] The second cooling channel is arranged on a side of the first cooling channel away from the first avoidance hole.

[0019] Optionally, along the circumference of the sealing portion, the first cooling channel and the second cooling channel are alternately arranged.

[0020] Optionally, the sealing portion is provided with at least one second avoidance hole penetrating along the axial direction;

[0021] The second avoidance hole is arranged on a side of the first avoidance structure away from the first through hole, and the second avoidance hole is suitable for avoiding the detection mechanism.

[0022] Optionally, along the circumference of the sealing portion, the second avoidance hole is arranged between two adjacent first cooling channels, and the second avoidance hole and the plurality of first cooling channels are on the same circumference.

[0023] Optionally, the second avoidance hole is arranged on a side of the first cooling channel facing the second cooling channel.

[0024] Optionally, an orthographic projection area of ​​the second avoidance hole along the axial direction is larger than an orthographic projection area of ​​the first cooling channel along the axial direction.

[0025] Optionally, the stator core is provided with a third cooling channel extending along the axial direction, and a first oil guide channel corresponding to the first cooling channel is provided on the first side of the sealing portion, one end of the first oil guide channel is connected to the first cooling channel, and the other end of the first oil guide channel is connected to the third cooling channel.

[0026] Optionally, the first oil guiding channel extends along the first cooling channel toward the center of the first through hole.

[0027] Optionally, the sealing portion is provided with a notch for a lead wire connected to the winding to pass through and penetrating along the axial direction, and the notch is provided on a side of the first avoidance structure away from the first through hole.

[0028] Optionally, the sealing portion is provided with a notch for a lead wire connected to the winding to pass through and passing through along the axial direction, and the notch is provided on a side of the first cooling structure away from the first through hole;

[0029] The notch is an arc-shaped segment extending along the circumference of the sealing portion;

[0030] Along the circumference of the sealing portion, the notch is arranged between two of the second cooling channels.

[0031] Optionally, the sealing portion is provided with a second oil guide channel;

[0032] One end of the second oil guide channel is communicated with the notch, and the other end is communicated with the second cooling channel adjacent to the notch.

[0033] Optionally, the number of the sealing structures and the number of the sealing covers are both two, the two sealing covers are respectively arranged at two ends of the stator core, and the two sealing structures are respectively a first sealing structure and a second sealing structure;

[0034] In the first sealing structure, a first oil guide channel corresponding to the first cooling channel is provided on the first side of the sealing portion, one end of the first oil guide channel is connected to the first cooling channel, and the other end of the first oil guide channel is connected to the first side of the sealing portion;

[0035] In the second sealing structure, the sealing portion is provided with a notch for the lead wire connecting the winding to pass through and passing through along the axial direction, and the notch is arranged on the side of the first cooling structure away from the first through hole; the notch is an arc segment extending along the circumference of the sealing portion; along the circumference of the sealing portion, the notch is arranged between two of the second cooling channels.

[0036] Optionally, in the first sealing structure, the first oil guide channel extends along the first cooling channel toward the center of the first through hole;

[0037] In the second sealing structure, the sealing portion is provided with a second oil guiding channel; one end of the second oil guiding channel is communicated with the notch, and the other end of the second oil guiding channel is communicated with the second cooling channel adjacent thereto.

[0038] Optionally, the number of the sealing structures and the number of the sealing covers are both two, the two sealing covers are respectively arranged at two ends of the stator core, and the two sealing structures are respectively a first sealing structure and a second sealing structure;

[0039] In the first sealing structure, along the circumference of the sealing portion, the second avoidance hole is arranged between two adjacent first cooling channels;

[0040] In the second sealing structure, the second avoidance hole is arranged on a side of the first cooling channel facing the second cooling channel.

[0041] Optionally, at least one protruding structure is provided on the periphery of the sealing portion, and the protruding structure protrudes away from the periphery of the sealing portion.

[0042] Optionally, the protruding structure is provided with a mounting groove, and a notch of the mounting groove is opened toward the second side.

[0043] Optionally, an outer peripheral surface of the limiting portion forms a step structure.

[0044] Optionally, the second through hole is a stepped hole.

[0045] Optionally, the stepped hole includes at least two sub-through holes, and the apertures of the at least two sub-through holes decrease sequentially in a direction away from the first through hole.

[0046] Optionally, an annular sealing groove is provided on one side of the limiting portion facing the sealing cover, and an annular protrusion is provided on one side of the sealing cover facing the limiting portion, and the annular protrusion is inserted into the annular sealing groove;

[0047] Alternatively, an annular protrusion is provided on one side of the limiting portion facing the sealing cover, and an annular sealing groove is correspondingly provided on one side of the sealing cover facing the limiting portion, and the annular protrusion is inserted into the annular sealing groove.

[0048] Optionally, an inner diameter of the rotor accommodating space is smaller than or equal to a diameter of the first through hole, and an axis of the rotor accommodating space coincides with an axis of the first through hole.

[0049] Optionally, the outer diameter of the sealing portion is D1, the outer diameter of the stator core is D2, and D2-D1<0.5mm.

[0050] Optionally, the stator core is provided with a plurality of avoidance channels penetrating along the axial direction, and the avoidance channels are opposite to and connected with the first avoidance holes one by one;

[0051] An extension length of the first avoidance hole along the radial direction of the first through hole is L1, and an extension length of the avoidance channel along the radial direction of the first through hole is L2, where L2<L1.

[0052] Optionally, a minimum distance between the first avoidance hole and the axis of the first through hole is R1, a minimum distance between the avoidance channel and the axis of the first through hole is R2, and 0.1 mm≤R2-R1≤1 mm.

[0053] Optionally, a width of the first avoidance hole in the circumferential direction of the sealing portion is H1, a width of the avoidance channel in the circumferential direction of the stator core is H2, and 0.1 mm≤H1-H2≤1 mm.

[0054] In a second aspect, the present invention discloses a motor, comprising the above-mentioned stator assembly.

[0055] In a third aspect, the present invention discloses a power assembly including the above-mentioned motor.

[0056] In a fourth aspect, the present invention discloses a vehicle, comprising the above-mentioned power assembly, or the above-mentioned motor.

[0057] The embodiments of the present invention include the following advantages:

[0058] In the embodiment of the present invention, since the sealing part can contact the stator core surface through the first side, it is easy to ensure the sealing of the connection between the sealing part and the stator core, thereby preventing the cooling oil from leaking from between the sealing part and the stator core. In addition, the sealing structure and the stator core can be prepared separately and fixed by splicing, and the cost of preparing the sealing structure and the stator core separately can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of a sealing structure of the present invention being assembled with a stator core and a sealing cover respectively;

[0060] Figure 2 The present invention Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0061] Figure 3 The present invention Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0062] Figure 4 It is a schematic diagram of the assembly of a sealing structure and a stator core of the present invention;

[0063] Figure 5is a schematic structural diagram of a sealing portion of the present invention on the second side;

[0064] Figure 6 is a schematic structural diagram of a sealing portion of the present invention on a first side;

[0065] Figure 7 It is a schematic diagram of another sealing structure of the present invention assembled with a stator core;

[0066] Figure 8 is a schematic structural diagram of another sealing portion of the present invention on the second side;

[0067] Fig. 9 is a schematic structural diagram of another sealing portion of the present invention on the first side;

[0068] Fig.10 is a cross-sectional view of a stator assembly of the present invention;

[0069] Fig.11 It is a cross-sectional view of a sealing structure of the present invention.

[0070] Description of reference numerals:

[0071] 100, sealing structure; 1, sealing part; 11, first through hole; 121, first side; 122, second side; 13, first avoidance structure; 131, first avoidance hole; 14, first cooling structure; 141, first cooling channel; 143, first oil guide channel; 15, second cooling structure; 151, second cooling channel; 161, notch; 162, second oil guide channel; 17, protrusion structure; 171, mounting groove; 18, second avoidance hole; 2, limiting part; 21, second through hole; 23, step structure; 31, annular sealing groove; 32, annular protrusion; 200, stator core; 210, avoidance channel; 220; third cooling channel; 230, fourth cooling channel; 240, injection molding; 241, fifth cooling channel; 250, limiting strip; 260, rotor accommodating space; 300, sealing cover; 400, cooling cavity. DETAILED DESCRIPTION

[0072] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0073] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0074] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] It should be noted that the motor includes a stator and a rotor, and the stator includes a stator core and a copper wire winding. When the motor is cooled by cooling oil, the cooling oil is usually used to cool the stator. The end of the copper wire winding can be immersed in the cooling oil, that is, an oil-immersed cooling motor can be used. Alternatively, the motor can be cooled by direct cooling at the bottom of the slot, that is, the cooling oil can be close to but not in contact with the copper wire winding. In order to prevent the cooling oil from increasing the resistance of the rotor, on the first aspect, an embodiment of the present invention proposes a stator assembly with a sealing structure for blocking the cooling oil from flowing to the rotor, and the stator assembly may specifically include a stator core 200; a sealing cover 300, which is arranged at the end of the stator core 200; a sealing structure 100, which is connected between the end of the stator core 200 and the sealing cover 300; wherein the sealing structure 100 includes a sealing portion 1 and a limiting portion 2, the sealing portion 1 includes a first side 121 and a second side 122 opposite to each other along the axial direction of the stator core 200, and the first side 121 is in contact with the end surface of the stator core 200; the limiting portion 2 protrudes from the second side 122, and the limiting portion 2 is plugged into the sealing cover 300.

[0077] In the embodiment of the present invention, since the sealing portion 1 can be connected to the stator core 200 through the first side 121, the sealing portion 1 can be in surface contact with the stator core 200, which is convenient for ensuring the sealing of the connection between the sealing portion 1 and the stator core 200, thereby preventing the cooling oil from leaking from between the sealing portion 1 and the stator core 200. Moreover, the sealing structure 100 and the stator core 200 can be prepared separately and fixed by splicing, and the cost of preparing the sealing structure 100 and the stator core 200 separately can be reduced.

[0078] In the stator assembly disclosed in the embodiment of the present invention, the sealing structure 100 can be connected between the end of the stator core 200 and the sealing cover 300 to cool the stator, thereby reducing the temperature of the motor, and at the same time seal the cooling oil to prevent the cooling oil from flowing to the rotor. For example, Figures 1 to 3 As shown, both ends of the stator core 200 are connected to the sealing cover 300 through the sealing structure 100. The sealing cover 300 and the sealing structure 100 enclose a cooling chamber 400 for accommodating cooling oil. The sealing structure 100 is sealedly connected to the stator core 200 and the sealing cover 300 respectively, which can prevent the cooling oil from flowing to the rotor, thereby ensuring the rotation speed of the rotor.

[0079] Specifically, the stator core 200 may be in the shape of a body of revolution, or may be in a rectangular shape, etc. The sealing structure 100 may be in the shape of a body of revolution, a rectangular shape, or other shapes, etc., and the embodiment of the present invention does not specifically limit this. The sealing structure 100 may be adapted to the shape of the stator core 200. In the embodiment of the present invention, the sealing structure 100 is in the shape of a body of revolution as an example for explanation. The sealing structure 100 is adapted to the shape of the stator core 200, the axis of the sealing structure 100 and the axis of the stator core 200 may coincide, the axial direction of the sealing structure 100 is consistent with the axial direction of the stator core 200, and the radial direction of the sealing structure 100 is consistent with the radial direction of the stator core 200.

[0080] Specifically, the embodiment of the present invention does not specifically limit the material of the sealing structure 100, as long as it meets the sealing connection requirements. The sealing structure 100 includes a sealing portion 1 and a limiting portion 2, the sealing portion 1 has a first side 121 and a second side 122 opposite to each other along the axial direction, the limiting portion 2 can protrude from the second side 122 of the sealing portion 1, and the limiting portion 2 and the sealing portion 1 can be integrally formed to effectively ensure the structural stability of the sealing structure 100. In other cases, the limiting portion 2 and the sealing portion 1 can also be connected by splicing and fixing, which is not specifically limited in the embodiment of the present invention.

[0081] Optionally, the stator core 200 encloses a rotor accommodating space 260 that penetrates along the axial direction, and the rotor accommodating space 260 is used to accommodate the rotor. The sealing portion 1 is provided with a first through hole 11 that penetrates along the axial direction, and the limiting portion 2 is provided with a second through hole 21 that penetrates along the axial direction. The second through hole 21, the first through hole 11 and the rotor accommodating space 260 can be connected in sequence along the axial direction to facilitate accommodating the rotor and wiring.

[0082] The middle of the stator core 200 is hollowed out to form a rotor accommodating space 260 for arranging the rotor, and the first through hole 11 and the second through hole 21 are specifically designed to adapt to the rotor accommodating space 260 .

[0083] Specifically, a limiting bar 250 may be provided on the outer circumference of the stator core 200 to limit the position in the circumferential direction, and the number of the limiting bar 250 may be at least one.

[0084] For example, when the stator core 200 is in the shape of a rotating body, the rotor accommodating space 260 can be a circular hole; when the stator core 200 is in the shape of a rectangle, the rotor accommodating space 260 can be a rectangular hole. When the sealing structure 100 is in the shape of a rotating body, the sealing portion 1 and the limiting portion 2 can both be circular ring structures, and the first through hole 11 and the second through hole 21 can both be circular holes; when the sealing structure 100 is in the shape of a rectangle, the sealing portion 1 and the limiting portion 2 can both be rectangular ring structures, and the first through hole 11 and the second through hole 21 can be rectangular holes.

[0085] Specifically, the first side 121 of the sealing part 1 can form a connection plane, and the connection plane can be fitted and connected with the end of the stator core 200, so that the sealing part 1 is in surface contact with the stator core 200, which is convenient for ensuring the connection sealing between the sealing part 1 and the stator core 200. Further, the first side 121 of the sealing part 1 can be fixed to the end surface of the stator core 200 by bonding, and the sealing effect is better.

[0086] Specifically, the sealing portion 1 may include an inner ring region and an outer ring region, and the inner ring region is arranged near the first through hole 11. The first through hole 11 and the second through hole 21 may be aligned in the axial direction, the limiting portion 2 may be connected to the inner ring region of the sealing portion 1, the limiting portion 2 may extend outward along the inner ring end surface of the sealing portion 1, and the limiting portion 2 may protrude from the second side 122 of the sealing portion 1. The inner diameter of the limiting portion 2 may be greater than or equal to the inner diameter of the sealing portion 1, that is, the aperture of the second through hole 21 may be greater than or equal to the aperture of the first through hole 11, and the outer diameter of the limiting portion 2 may be smaller than the outer diameter of the sealing portion 1, so that the outer periphery of the limiting portion 2 cooperates with the sealing portion 1 to form a step structure 23, such as Fig.11 As shown, the cross-sectional shape of the sealing structure 100 along the axial direction may be an “L-shaped” shape.

[0087] Optionally, the sealing portion 1 is provided with a first avoidance structure 13, which includes a plurality of first avoidance holes 131 for the windings to pass through and which pass through axially, the first avoidance holes 131 extending toward the center of the first through hole 11, and the plurality of first avoidance holes 131 are arranged at intervals along the circumference of the sealing portion 1.

[0088] In the implementation of the present invention, the first avoidance hole 131 is connected along the axial direction, and the first avoidance hole 131 can avoid the copper wire winding, so that the copper wire winding can be smoothly arranged on the stator core 200.

[0089] Specifically, the stator core 200 is provided with a plurality of avoidance channels 210 penetrating along the axial direction. The avoidance channels 210 extend toward the center of the rotor accommodating space 260 . The plurality of avoidance channels 210 are arranged at intervals along the circumferential direction of the stator core 200 .

[0090] Specifically, the first avoidance holes 131 and the avoidance channels 210 can be opposite to each other and connected one by one. Both the first avoidance holes 131 and the avoidance channels 210 are used to pass the copper wire windings. The number and shape of the first avoidance holes 131 and the avoidance channels 210 can be designed with reference to the number and shape of the copper wire windings required for the stator, which is not limited in the embodiments of the present invention.

[0091] Specifically, the first avoidance hole 131 may be a long strip structure, and the first avoidance hole 131 may extend toward the center of the first through hole 11. For example, the first avoidance hole 131 may be arranged along the radial direction of the sealing portion 1.

[0092] Specifically, the centers of the plurality of first avoidance holes 131 may be on the same circle to improve the structural stability and strength of the sealing structure 100 .

[0093] Specifically, the plurality of first avoidance holes 131 may be evenly spaced along the circumference of the sealing portion 1 to improve the structural stability and strength of the sealing structure 100. In some optional embodiments, the plurality of first avoidance holes 131 may also be unevenly spaced along the circumference of the sealing portion 1.

[0094] Optionally, the sealing portion 1 is provided with a first cooling structure 14, which is arranged on a side of the first avoidance structure 13 away from the first through hole 11; the first cooling structure 14 includes a plurality of first cooling channels 141 that penetrate axially, and the plurality of first cooling channels 141 are arranged at intervals along the circumference of the sealing portion 1.

[0095] In the embodiment of the present invention, the first cooling structure 14 is disposed on a side of the first avoidance structure 13 away from the first through hole 11, so that the first cooling channel 141 is closer to the high temperature area, thereby improving the cooling capacity of the motor.

[0096] Specifically, when the motor is working, the copper wire winding generates a lot of heat. Since the copper wire winding can be inserted into the first avoidance hole 131, by setting the first cooling structure 14 close to the first avoidance structure 13, the cooling oil passing through the first cooling channel 141 can cool the copper wire winding.

[0097] Specifically, the first cooling channel 141 is axially connected for flowing cooling oil, and the first cooling channel 141 can be spaced apart from the first avoidance hole 131. The first cooling channel 141 can be a circular hole or a rectangular hole, that is, the cross-sectional shape of the first cooling channel 141 perpendicular to the axial direction can be circular or rectangular.

[0098] Specifically, the plurality of first cooling channels 141 may be evenly spaced along the circumference of the sealing portion 1 to improve the structural stability and strength of the sealing structure 100. In some optional embodiments, the plurality of first cooling channels 141 may also be unevenly spaced along the circumference of the sealing portion 1.

[0099] Specifically, the centers of the plurality of first cooling channels 141 may be located on the same circle to improve the structural stability and strength of the sealing structure 100 .

[0100] Specifically, along the radial direction of the sealing portion 1 , the first cooling channel 141 may be disposed on a side of the first avoidance hole 131 away from the first through hole 11 .

[0101] Specifically, the number of the first cooling channels 141 may be consistent with or inconsistent with the number of the first avoidance holes 131 , and may be set specifically according to design requirements.

[0102] Optionally, a first cooling channel 141 may be opposite to a first avoidance hole 131 along the radial direction of the sealing portion 1, or, along the circumferential direction of the sealing portion 1, the first cooling channel 141 and the first avoidance hole 131 may also be alternately arranged, so that one cooling channel can cool the copper wire windings in two first avoidance holes 131 at the same time.

[0103] Optionally, the sealing portion 1 is further provided with a second cooling structure 15, which is arranged on a side of the first cooling structure 14 away from the first avoidance structure 13; the second cooling structure 15 includes a plurality of second cooling channels 151 that penetrate axially, and the plurality of second cooling channels 151 are arranged at intervals along the circumference of the sealing portion 1.

[0104] In the embodiment of the present invention, the second cooling channel 151 can cooperate with the first cooling channel 141 to enhance the cooling effect.

[0105] Specifically, the second cooling channel 151 is axially connected for flowing cooling oil, and the second cooling channel 151 can be spaced apart from the first cooling channel 141. The second cooling channel 151 can be a circular hole or a rectangular hole, that is, the cross-sectional shape of the second cooling channel 151 perpendicular to the axial direction can be circular or rectangular.

[0106] Specifically, the plurality of second cooling channels 151 may be evenly spaced along the circumference of the sealing portion 1 to improve the structural stability and strength of the sealing structure 100. In some optional embodiments, the plurality of second cooling channels 151 may also be unevenly spaced along the circumference of the sealing portion 1.

[0107] Specifically, the centers of the plurality of second cooling channels 151 may be located on the same circle to improve the structural stability and strength of the sealing structure 100 .

[0108] Specifically, along the radial direction of the sealing portion 1, the first cooling structure 14 can be disposed between the first avoidance structure 13 and the second cooling structure 15. Specifically, the number of the second cooling channels 151 can be consistent with or inconsistent with the number of the first cooling channels 141, and can be specifically set according to design requirements.

[0109] Optionally, along the circumference of the sealing portion 1 , the first cooling channels 141 and the second cooling channels 151 are alternately arranged, which can improve the uniformity of cooling and further improve the cooling effect.

[0110] Specifically, the sizes of the first cooling channel 141 and the second cooling channel 151 may be the same or different. Along the circumference of the sealing portion 1, the first cooling channel 141 and the second cooling channel 151 may be staggered by a distance or angle of a first avoidance hole 131. For example, the first cooling channel 141 and a first avoidance hole 131 are opposite to each other in the radial direction of the sealing portion 1, and the second cooling channel 151 and the area between two adjacent first avoidance holes 131 are opposite to each other in the radial direction of the sealing portion 1, or the first cooling channel 141 and the area between two adjacent first avoidance holes 131 are opposite to each other in the radial direction of the sealing portion 1, and the second cooling channel 151 and a first avoidance hole 131 are opposite to each other in the radial direction of the sealing portion 1.

[0111] In other optional embodiments, one second cooling channel 151 may be opposite to another second cooling channel 151 along the radial direction of the sealing portion 1 .

[0112] Alternatively, if Figure 7 and Figure 8 As shown, the sealing portion 1 is provided with at least one second avoidance hole 18 penetrating in the axial direction. The second avoidance hole 18 is arranged on a side of the first avoidance structure 13 away from the first through hole 11 . The second avoidance hole 18 is suitable for avoiding the detection mechanism.

[0113] In the embodiment of the present invention, the second avoidance hole 18 can be used to avoid the detection tool, so as to detect the flatness of the end surface of the stator core 200.

[0114] Specifically, the number of the second avoidance holes 18 can be one, two, three, etc., which is not specifically limited in the embodiment of the present invention. At least two second avoidance holes 18 can be arranged at uniform or non-uniform intervals along the circumference of the sealing portion 1. The centers of the at least two second avoidance holes 18 can be located on the same circle.

[0115] Specifically, the second avoidance hole 18 may be a circular hole or a rectangular hole, that is, the cross-sectional shape of the second avoidance hole 18 perpendicular to the axial direction may be circular or rectangular, etc.

[0116] In the embodiment of the present invention, the sealing portion 1 is provided with a first avoidance hole 131 and a second avoidance hole 18, respectively, which can ensure the measurement effect of the end face detection of the stator core 200 and the insertion of the copper wire winding.

[0117] In some embodiments, along the circumference of the sealing portion 1 , the second avoidance hole 18 is disposed between two adjacent first cooling channels 141 , and the second avoidance hole 18 and the plurality of first cooling channels 141 are on the same circumference, so that the components on the sealing portion 1 can be arranged reasonably.

[0118] Specifically, the center of the second avoidance hole 18 and the center of the first cooling channel 141 may be on the same circle. In some cases, the second avoidance hole 18 may also be used as a cooling channel, playing the same role as the first cooling channel 141, so that the second avoidance hole 18 can achieve functional diversity.

[0119] In some other optional embodiments, the second avoidance hole 18 is disposed on a side of the first cooling structure 14 facing the second cooling structure 15 .

[0120] In the embodiment of the present invention, the second avoidance hole 18 may be disposed between the first cooling structure 14 and the second cooling structure 15, so as to avoid mutual interference between the second avoidance hole 18, the first cooling channel 141 and the second cooling channel.

[0121] Optionally, the orthographic projection area of ​​the second avoidance hole 18 along the axial direction is larger than the orthographic projection area of ​​the first cooling channel 141 along the axial direction, so that the opening size of the second avoidance hole 18 is larger, which is convenient for avoiding the detection tool.

[0122] Optionally, the stator core 200 is provided with a third cooling channel 220 extending along the axial direction, such as Fig. 9 As shown, the first side 121 of the sealing portion 1 is provided with a first oil guide channel 143 corresponding to the first cooling channel 141 , one end of the first oil guide channel 143 is connected to the first cooling channel 141 , and the other end of the first oil guide channel 143 is connected to the third cooling channel 220 .

[0123] In the embodiment of the present invention, one end of the first oil guide channel 143 is connected to the first cooling channel 141 , and the other end is connected to the third cooling channel 220 on the stator core 200 , which can improve the reliability of the adaptation of the sealing structure 100 to the stator core 200 .

[0124] Specifically, the number of the first oil guiding channels 143 may be consistent with the number of the first cooling channels 141 , and one first cooling channel 141 may be configured with one first oil guiding channel 143 .

[0125] When oil is passed, the first cooling channel 141 and the second cooling channel 151 can pass oil according to actual needs. For example, in some embodiments, Figure 2 As shown, the cooling oil enters from the first cooling channel 141 and flows into the third cooling channel 220 of the stator core 200, thereby cooling the stator core 200. In some embodiments, the stator core 200 is provided with a fourth cooling channel 230, which is connected to the second cooling channel 151. The cooling oil enters from the second cooling channel 151 and flows into the fourth cooling channel 230 of the stator core 200, thereby cooling the stator core 200.

[0126] In other embodiments, the flow directions of the third cooling channel 220 and the fourth cooling channel 230 in the stator core 200 are different, that is, Figure 1 As shown, a part of the cooling oil enters from the first cooling channel 141 in the sealing structure 100 at the lower side, flows upward along the third cooling channel 220 to the cooling cavity 400 corresponding to the sealing structure 100 at the upper side, and another part of the cooling oil enters from the second cooling channel 151 in the sealing structure 100 at the upper side, flows downward along the fourth cooling channel 230 to the cooling cavity 400 corresponding to the sealing structure 100 at the lower side. Thus, the cooling effect of the stator core 200 is guaranteed.

[0127] Specifically, the first oil guiding channel 143 may be a groove with a notch opening toward the first side 121 , and the first oil guiding channel 143 communicates with the first cooling channel 141 , so that the first oil guiding channel 143 and the first cooling channel 141 may be combined to form an axially conductive stepped hole.

[0128] Optionally, the first oil guide channel 143 extends along the first cooling channel 141 toward the center of the first through hole 11, so that the first oil guide channel 143 can extend radially along the sealing portion 1, thereby facilitating the connection between the end of the first oil guide channel 143 away from the first cooling channel 141 and the third cooling channel 220 on the stator core 200.

[0129] Specifically, the first oil guiding channel 143 may be spaced apart from the first avoidance hole 131 , and the interval between the first oil guiding channel 143 and the first avoidance hole 131 may be greater than 0.5 mm.

[0130] In some other embodiments, the first oil guiding channel 143 may also extend along the circumference of the sealing portion 1 , and may be specifically configured according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0131] In some optional embodiments, the sealing portion 1 is provided with a notch 161 for the lead wire connected to the winding to pass through and passing through along the axial direction, and the notch 161 is provided on a side of the first avoidance structure 13 away from the first through hole 11 .

[0132] In the embodiment of the present invention, a notch 161 is provided on a side of the first avoidance structure 13 away from the first through hole 11 to facilitate avoiding the lead wires connecting the windings and improve the convenience of assembling the stator assembly.

[0133] Specifically, along the circumference of the sealing portion 1 , the notch 161 may be arranged adjacent to the first cooling channel 141 and / or the second cooling channel 151 .

[0134] In some other optional embodiments, the sealing portion 1 is provided with a notch 161 for the lead wire connecting the winding to pass through and which passes through axially, and the notch 161 is arranged on the side of the first cooling structure 14 away from the first through hole 11; the notch 161 is an arc segment extending along the circumference of the sealing portion 1; along the circumference of the sealing portion 1, the notch 161 is arranged between the two second cooling channels 151.

[0135] In the embodiment of the present invention, a notch 161 is provided on the outer periphery of the sealing portion 1 to facilitate avoiding the lead wires connecting the windings and improve the convenience of assembling the stator assembly.

[0136] Specifically, Figures 4 to 6 As shown, the stator further includes a lead wire injection molding body 240, and the notch 161 can be adapted to the lead wire injection molding body 240. For example, the lead wire injection molding body 240 is a fan-shaped structure, and the corresponding notch 161 can be a fan-shaped structure.

[0137] Optionally, the sealing portion 1 is provided with a second oil guiding channel 162 ; one end of the second oil guiding channel 162 is communicated with the notch 161 , and the other end is communicated with the second cooling channel 151 adjacent thereto.

[0138] In the embodiment of the present invention, one end of the second oil guide channel 162 is connected to the notch 161 , and the other end is connected to the second cooling channel 151 adjacent thereto, so that the sealing structure 100 can adapt to the stator core 200 to ensure the cooling effect of the stator core 200 .

[0139] Specifically, Figures 4 to 6 As shown, a fifth cooling channel 241 may be correspondingly provided on the lead-out line injection molding body 240 , and part of the fourth cooling channel 230 may be connected to the second oil guide channel 162 through the fifth cooling channel 241 , and further connected to the second cooling channel 151 .

[0140] In some embodiments of the present invention, at least one protruding structure 17 is disposed on the outer periphery of the sealing portion 1 , and the protruding structure 17 protrudes away from the outer periphery of the sealing portion 1 .

[0141] In the embodiment of the present invention, since the protruding structure 17 protrudes away from the outer periphery of the sealing portion 1 , the protruding structure 17 can cooperate with other components in the circumferential direction of the sealing portion 1 , thereby improving the reliability of fixing the sealing structure 100 .

[0142] Specifically, when the stator assembly is assembled to the motor housing, the protruding structure 17 can play a limiting role in the circumferential direction of the sealing portion 1 .

[0143] Specifically, the number of the protruding structures 17 may be one, two, three or four, etc., and at least two protruding structures 17 may be arranged at uniform or non-uniform intervals along the circumference of the sealing portion 1 .

[0144] Optionally, the protruding structure 17 is provided with a mounting groove 171 , and the notch of the mounting groove 171 is opened toward the second side 122 , which can improve the convenience of mounting and matching the sealing part 1 with other components.

[0145] Specifically, the mounting groove 171 can be used to fix the sealing portion 1 and the oil collecting ring to prevent the oil collecting ring from falling after the stator assembly is installed in the motor housing.

[0146] Specifically, the opening of the installation groove 171 is opened toward the second side 122 , or the installation groove 171 may also penetrate along the axial direction.

[0147] Optionally, a step structure 23 is formed on the outer peripheral surface of the limiting portion 2, so that the limiting portion 2 can make room for other components and improve the convenience of motor layout.

[0148] Alternatively, if Figure 3 As shown, the second through hole 21 may be a stepped hole, and the stepped hole may include at least two sub-through holes, and the apertures of the at least two sub-through holes decrease sequentially in a direction away from the first through hole 11 .

[0149] In the embodiment of the present invention, the apertures of at least two sub-through holes decrease successively in the direction away from the first through hole 11, so that the cooling cavity formed by the sealing structure 100 and the sealing cover expands in the direction away from the first through hole 11, and can accommodate the welding end of the winding.

[0150] Optionally, the side of the limiting portion 2 facing the sealing cover 300 may be provided with an annular sealing groove 31, and the corresponding side of the sealing cover 300 facing the limiting portion 2 may be provided with an annular protrusion 32, and the annular protrusion 32 is inserted into the annular sealing groove 31; or, the side of the limiting portion 2 facing the sealing cover 300 may be provided with an annular protrusion 32, and the corresponding side of the sealing cover 300 facing the limiting portion 2 may be provided with an annular sealing groove 31, and the annular protrusion 32 is inserted into the annular sealing groove 31.

[0151] In the embodiment of the present invention, the sealing cover 300 can be plugged and matched with the limiting portion 2 by inserting the annular protrusion 32 into the annular sealing groove 31, and the implementation method is simple and convenient.

[0152] Furthermore, the annular sealing groove 31 may be filled with sealant to improve the reliability of the sealing connection between the limiting portion 2 and the sealing cover 300 .

[0153] Specifically, Figure 2 As shown, the annular protrusion 32 on the limiting portion 2 can be inserted into the annular sealing groove 31 on the sealing cover 300, so that the limiting portion 2 can be limited and matched with the sealing cover 300. Figure 3 As shown, the annular protrusion 32 on the sealing cover 300 can be inserted into the annular sealing groove 31 on the limiting portion 2.

[0154] Optionally, the wall thickness of the thinnest part of the limiting portion 2 is T1, and T1 ≥ 0.6 mm, so as to ensure the structural strength of the limiting portion 2.

[0155] Optionally, the wall thickness of the annular sealing groove 31 is T2, where T2 ≥ 0.6 mm, so as to ensure the structural strength of the limiting portion 2 .

[0156] Optionally, the aperture of the rotor accommodating space 260 is smaller than or equal to the aperture of the first through hole 11 , and the axis of the rotor accommodating space 260 coincides with the axis of the first through hole 11 , which can improve the convenience of assembly between the stator core 200 and the sealing part 1 .

[0157] Alternatively, if Fig.10 As shown, the outer diameter of the sealing portion 1 is D1, the outer diameter of the stator core 200 is D2, and D2-D1<0.5mm.

[0158] In the embodiment of the present invention, the outer diameter of the sealing portion 1 is smaller than the outer diameter of the stator core 200 , so that the sealing portion 1 can be prevented from interfering with other components in the stator assembly.

[0159] Optionally, the stator core 200 is provided with a plurality of avoidance channels 210 which penetrate along the axial direction, and the avoidance channels 210 are opposite to and connected with the first avoidance holes one by one; the radial extension length of the first avoidance hole 131 along the first through hole 11 is L1, and the radial extension length of the avoidance channel 210 along the first through hole 11 is L2, L2<L1, so that the length of the first avoidance hole 131 is greater than the length of the avoidance channel, which facilitates the first avoidance hole 131 to avoid the copper wire winding, thereby improving the convenience and reliability of inserting the copper wire winding into the avoidance channel 210.

[0160] Optionally, the minimum distance between the first avoidance hole 131 and the axis of the first through hole 11 is R1, the minimum distance between the avoidance channel 210 and the axis of the first through hole 11 is R2, and 0.1 mm≤R2-R1≤1 mm.

[0161] In the embodiment of the present invention, R2 is greater than R1, so that the avoidance space formed by the first avoidance hole 131 is larger than the avoidance space of the avoidance channel 210, so that the first avoidance hole 131 can play an avoidance role, facilitate the insertion of the copper wire winding, and avoid interference problems.

[0162] Optionally, the width of the first avoidance hole 131 in the circumferential direction of the sealing portion 1 is H1, the width of the avoidance channel 210 in the circumferential direction of the stator core 200 is H2, and 0.1 mm≤H1-H2≤1 mm.

[0163] In the embodiment of the present invention, H1 is greater than H2, so that the opening size of the first avoidance hole 131 is larger than the opening size of the avoidance channel 210, and the reliability of plugging in the copper wire winding can be improved.

[0164] Optionally, the sealing cover 300 is plugged into the limiting portion 2 , and the sealing cover 300 and the sealing structure 100 enclose a cooling cavity 400 , which is convenient for passing cooling oil, thereby realizing cooling of the stator.

[0165] Optionally, the number of the sealing structures 100 and the sealing covers 300 are both two, the two sealing covers 300 are respectively arranged at both ends of the stator core 200, and the two sealing structures 100 are respectively the first sealing structure and the second sealing structure; Figure 1 As shown, the sealing cover 300 and the sealing structure 100 enclose a cooling cavity 400 , and both ends of the stator core are connected to the sealing cover 300 through the sealing structure 100 .

[0166] For example, one end of the stator core 200 can be connected to the first sealing cover through a first sealing structure, and the other end of the stator core 200 can be connected to the second sealing cover through a second sealing structure. The first sealing structure and the first sealing cover can enclose a first cooling cavity, and the second sealing structure and the second sealing cover can enclose a second cooling cavity. Among them, one end of the copper wire winding can be located in the first cooling cavity to be cooled by the cooling oil in the first cooling cavity, and the other end of the copper wire winding can be located in the second cooling cavity to be cooled by the cooling oil in the second cooling cavity.

[0167] Specifically, the cooling oil flows from the first cooling channel 141 on the first sealing structure to the third cooling channel 220 on the stator core 200, and then flows to the first cooling channel 141 on the second sealing structure, so as to form a cooling oil circuit; the cooling oil flows from the second cooling channel 151 on the second sealing structure to the fourth cooling channel 230 on the stator core 200, and then flows to the second cooling channel 151 on the first sealing structure, so as to form another cooling oil circuit.

[0168] Specifically, Figure 1As shown, one end of the stator core 200 may form a star point side, and the other end may form a hairpin side. The star point side may be assembled with a first sealing gasket, and the hairpin side may be assembled with a second sealing gasket.

[0169] In some optional embodiments, in the first sealing structure, a first oil guide channel 143 corresponding to the first cooling channel 141 is provided on the first side of the sealing portion 1, one end of the first oil guide channel 143 is connected to the first cooling channel 141, and the other end of the first oil guide channel 143 is connected to the first side of the sealing portion 1; in the second sealing structure, the sealing portion 1 is provided with a notch 161 for the lead wire connecting the winding to pass through and which passes through axially, and the notch 161 is provided on the side of the first cooling structure 14 away from the first through hole 11; the notch 161 is an arc segment extending along the circumference of the sealing portion 1; along the circumference of the sealing portion 1, the notch 161 is provided between the two second cooling channels 151.

[0170] In an embodiment of the present invention, the shapes of the first sealing structure and the second sealing structure are different. One end of the stator core can be connected to the sealing cover 300 through the first sealing structure, and the other end can be connected to the sealing cover 300 through the second sealing structure, so that the stator core 200 can adapt to a variety of different shapes of sealing covers 300, which is convenient for ensuring the structural diversity of the stator assembly to adapt to various types of motors.

[0171] Furthermore, in the first sealing structure, the first oil guide channel extends along the first cooling channel toward the center of the first through hole 11; in the second sealing structure, the sealing portion 1 is provided with a second oil guide channel 162; one end of the second oil guide channel 162 is connected to the notch 161, and the other end is connected to the second cooling channel 151 adjacent thereto.

[0172] In the embodiments of the present invention, the structural diversity of the stator assembly can be further expanded.

[0173] In some other optional embodiments, in the first sealing structure, the second avoidance hole 18 is arranged between two adjacent first cooling channels 141 along the circumference of the sealing portion 1; in the second sealing structure, the second avoidance hole 18 is arranged on the side of the first cooling channel 141 facing the second cooling channel 151.

[0174] In an embodiment of the present invention, the shapes of the first sealing structure and the second sealing structure are different. One end of the stator core can be connected to the sealing cover 300 through the first sealing structure, and the other end can be connected to the sealing cover 300 through the second sealing structure, so that the stator core 200 can adapt to a variety of different sealing cover shapes, which is convenient for ensuring the structural diversity of the stator assembly to adapt to various types of motors.

[0175] The stator assembly described in the embodiment of the present invention has at least the following advantages:

[0176] In the embodiment of the present invention, since the sealing part can contact the stator core surface through the first side, it is easy to ensure the sealing of the connection between the sealing part and the stator core, thereby preventing the cooling oil from leaking from between the sealing part and the stator core. In addition, the sealing structure and the stator core are prepared separately and fixed by splicing, and the cost of preparing the sealing structure and the stator core separately can be reduced.

[0177] In a second aspect, an embodiment of the present invention further discloses a motor, comprising the above-mentioned stator assembly.

[0178] The motor described in the embodiment of the present invention can achieve the same beneficial effects as the above-mentioned stator assembly, which will not be described in detail here.

[0179] In a third aspect, an embodiment of the present invention further discloses a power assembly, including the above-mentioned motor.

[0180] The powertrain described in the embodiment of the present invention can achieve the same beneficial effects as the above-mentioned motor, which will not be described in detail here.

[0181] In a fourth aspect, an embodiment of the present invention further discloses a vehicle, comprising the above-mentioned power assembly or the above-mentioned motor.

[0182] The vehicle described in the embodiment of the present invention can achieve the same beneficial effects as the above-mentioned powertrain or motor, which will not be repeated here.

[0183] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0184] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0185] The above is a detailed introduction to a stator assembly, a motor, a powertrain and a vehicle provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for a person skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A stator assembly, characterized in that: include: Stator core (200); A sealing cover (300) is arranged at an end of the stator core (200); A sealing structure (100) connected between an end of the stator core (200) and the sealing cover (300); The sealing structure (100) comprises a sealing portion (1) and a limiting portion (2); the sealing portion (1) comprises a first side (121) and a second side (122) which are axially opposite to each other along the stator core (200); the first side (121) is in contact with an end surface of the stator core (200); the limiting portion (2) protrudes from the second side (122), and the limiting portion (2) is plugged into the sealing cover (300).

2. The stator assembly according to claim 1, characterized in that The stator core (200) encloses a rotor accommodating space (260) that penetrates along the axial direction, the sealing portion (1) is provided with a first through hole (11) that penetrates along the axial direction, and the limiting portion (2) is provided with a second through hole (21) that penetrates along the axial direction; The second through hole (21), the first through hole (11), and the rotor accommodating space (260) are sequentially connected along the axial direction.

3. The stator assembly according to claim 2, characterized in that: The sealing portion (1) is provided with a first avoidance structure (13), the first avoidance structure (13) comprising a plurality of first avoidance holes (131) for windings to pass through and penetrating along the axial direction, the first avoidance holes (131) extending toward the center of the first through hole (11), and the plurality of first avoidance holes (131) being arranged at intervals along the circumference of the sealing portion (1).

4. The stator assembly according to claim 3, characterized in that: The sealing portion (1) is provided with a first cooling structure (14), and the first cooling structure (14) is arranged on a side of the first avoidance structure (13) away from the first through hole (11); The first cooling structure (14) comprises a plurality of first cooling channels (141) penetrating along the axial direction, and the plurality of first cooling channels (141) are arranged at intervals along the circumferential direction of the sealing portion (1).

5. The stator assembly according to claim 4, characterized in that The sealing portion (1) is further provided with a second cooling structure (15), and the second cooling structure (15) is arranged on a side of the first cooling structure (14) away from the first avoidance structure (13); The second cooling structure (15) comprises a plurality of second cooling channels (151) penetrating along the axial direction, and the plurality of second cooling channels (151) are arranged at intervals along the circumferential direction of the sealing portion (1).

6. The stator assembly according to claim 5, characterized in that Along the circumference of the sealing portion (1), the first cooling channels (141) and the second cooling channels (151) are alternately arranged.

7. The stator assembly according to claim 5, characterized in that The sealing portion (1) is provided with at least one second avoidance hole (18) penetrating along the axial direction; The second avoidance hole (18) is arranged on a side of the first avoidance structure (13) away from the first through hole (11), and the second avoidance hole (18) is suitable for avoiding the detection mechanism.

8. The stator assembly according to claim 7, characterized in that Along the circumferential direction of the sealing portion (1), the second avoidance hole (18) is arranged between two adjacent first cooling channels (141), and the second avoidance hole (18) and the plurality of first cooling channels (141) are located on the same circumference.

9. The stator assembly according to claim 7, characterized in that: The second avoidance hole (18) is arranged on a side of the first cooling structure (14) facing the second cooling structure (15).

10. The stator assembly according to claim 7, characterized in that The orthographic projection area of ​​the second avoidance hole (18) along the axial direction is greater than the orthographic projection area of ​​the first cooling channel (141) along the axial direction.

11. The stator assembly according to claim 4, characterized in that The stator core (200) is provided with a third cooling channel (220) extending along the axial direction, and the first side (121) of the sealing portion (1) is provided with a first oil guide channel (143) corresponding to the first cooling channel (141), one end of the first oil guide channel (143) is connected to the first cooling channel (141), and the other end of the first oil guide channel (143) is connected to the third cooling channel (220).

12. The stator assembly according to claim 11, characterized in that The first oil guide channel (143) extends along the first cooling channel (141) toward the center of the first through hole (11).

13. The stator assembly according to claim 3, characterized in that The sealing portion (1) is provided with a notch (161) for a lead wire connecting the winding to pass through and penetrating along the axial direction, and the notch (161) is provided on a side of the first avoidance structure (13) away from the first through hole (11).

14. The stator assembly according to claim 5, characterized in that The sealing portion (1) is provided with a notch (161) for a lead wire connected to the winding to pass through and penetrating along the axial direction, and the notch (161) is provided on a side of the first cooling structure (14) away from the first through hole (11); The notch (161) is an arc-shaped segment extending along the circumference of the sealing portion (1); Along the circumference of the sealing portion (1), the notch (161) is arranged between two of the second cooling channels (151).

15. The stator assembly according to claim 14, characterized in that The sealing portion (1) is provided with a second oil guide channel (162); One end of the second oil guide channel (162) is in communication with the notch (161), and the other end is in communication with the second cooling channel (151) adjacent thereto.

16. The stator assembly according to claim 5, characterized in that The number of the sealing structures (100) and the number of the sealing covers (300) are both two, the two sealing covers (300) are respectively arranged at two ends of the stator core (200), and the two sealing structures (100) are respectively a first sealing structure and a second sealing structure; In the first sealing structure, a first oil guide channel (143) corresponding to the first cooling channel is provided on the first side (121) of the sealing portion (1), one end of the first oil guide channel (143) is connected to the first cooling channel (141), and the other end of the first oil guide channel (143) is connected to the first side (121) of the sealing portion (1); In the second sealing structure, the sealing portion (1) is provided with a notch (161) for a lead wire for connecting the winding to pass through and penetrating along the axial direction, and the notch (161) is provided on a side of the first cooling structure (14) away from the first through hole (11); the notch (161) is an arc segment extending along the circumference of the sealing portion (1); along the circumference of the sealing portion (1), the notch (161) is provided between two of the second cooling channels (151).

17. The stator assembly according to claim 16, characterized in that In the first sealing structure, the first oil guide channel (143) extends along the first cooling channel (141) toward the center of the first through hole (11); In the second sealing structure, the sealing portion (1) is provided with a second oil guide channel (162); one end of the second oil guide channel (162) is connected to the notch (161), and the other end is connected to the second cooling channel (151) adjacent thereto.

18. The stator assembly according to claim 7, characterized in that The number of the sealing structures (100) and the number of the sealing covers (300) are both two, the two sealing covers (300) are respectively arranged at two ends of the stator core (200), and the two sealing structures (100) are respectively a first sealing structure and a second sealing structure; In the first sealing structure, along the circumference of the sealing portion (1), the second avoidance hole (18) is arranged between two adjacent first cooling channels (141); In the second sealing structure, the second avoidance hole (18) is arranged on a side of the first cooling channel (141) facing the second cooling channel (151).

19. The stator assembly according to claim 1, characterized in that At least one protruding structure (17) is provided on the outer periphery of the sealing portion (1), and the protruding structure (17) protrudes away from the outer periphery of the sealing portion (1).

20. The stator assembly according to claim 19, characterized in that The protruding structure (17) is provided with a mounting groove (171), and the notch of the mounting groove (171) is opened toward the second side (122).

21. The stator assembly according to claim 1, characterized in that The outer peripheral surface of the limiting portion (2) forms a step structure (23).

22. The stator assembly according to claim 2, characterized in that The second through hole (21) is a stepped hole, comprising at least two sub-through holes, and the apertures of the at least two sub-through holes decrease in sequence in a direction away from the first through hole (11).

23. The stator assembly according to claim 1, characterized in that An annular sealing groove (31) is provided on one side of the limiting portion (2) facing the sealing cover (300), and an annular protrusion (32) is correspondingly provided on one side of the sealing cover (300) facing the limiting portion (2), and the annular protrusion (32) is inserted into the annular sealing groove (31); Alternatively, an annular protrusion (32) is provided on the side of the limiting portion (2) facing the sealing cover (300), and a corresponding annular sealing groove (31) is provided on the side of the sealing cover (300) facing the limiting portion (2), and the annular protrusion (32) is inserted into the annular sealing groove (31).

24. The stator assembly according to claim 2, characterized in that The inner diameter of the rotor accommodating space (260) is smaller than or equal to the aperture of the first through hole (11), and the axis of the rotor accommodating space (260) coincides with the axis of the first through hole (11).

25. The stator assembly according to claim 24, characterized in that The outer diameter of the sealing portion (1) is D1, the outer diameter of the stator core (200) is D2, and D2-D1<0.5 mm.

26. The stator assembly according to claim 3, characterized in that The stator core (200) is provided with a plurality of avoidance channels (210) penetrating along the axial direction, and the avoidance channels (210) are opposite to and communicate with the first avoidance holes (131) one by one; The radial extension length of the first avoidance hole (131) along the first through hole (11) is L1, and the radial extension length of the avoidance channel (210) along the first through hole (11) is L2, where L2<L1.

27. The stator assembly according to claim 26, characterized in that The minimum distance between the first avoidance hole (131) and the axis of the first through hole (11) is R1, and the minimum distance between the avoidance channel (210) and the axis of the first through hole (11) is R2, and 0.1 mm≤R2-R1≤1 mm.

28. The stator assembly according to claim 26, characterized in that The width of the first avoidance hole (131) in the circumferential direction of the sealing portion (1) is H1, and the width of the avoidance channel (210) in the circumferential direction of the stator core is H2, and 0.1 mm≤H1-H2≤1 mm.

29. A motor, characterized in that: A stator assembly comprising any one of claims 1-28.

30. A powertrain, characterized in that: Including the motor as claimed in claim 29.

31. A vehicle, characterized in that: Includes the powertrain as described in claim 30, or the motor as described in claim 29.

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