Stator assembly, driving electric motor, power train and vehicle

Abstract

A vehicle, comprising a power train having a driving electric motor. The driving electric motor comprises a stator assembly, wherein the stator assembly comprises a stator core, the stator core comprising a first end face and a second end face which are arranged opposite each other in the axial direction of the stator core. The stator core further comprises a first stator oil channel and a second stator oil channel which are configured to allow the flow of oil, wherein the oil in the first stator oil channel can flow in the direction from the first end face to the second end face, and the oil in the second stator oil channel can flow in the direction from the second end face to the first end face.

Description

Stator assembly, drive motor, power assembly and vehicle

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese patent application No. 2024106498353, filed on May 23, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of motor cooling, and particularly relates to a stator assembly, a drive motor, a power assembly and a vehicle. BACKGROUND

[0004] With the advancement of technology, the power density requirement of the drive motor is getting higher and higher, and the internal space of the drive motor is getting more and more compact. Under the indexes of high power density and high torque density, the temperature rise of the drive motor is the most difficult to overcome. Therefore, the cooling problem of the drive motor becomes the main concern of the designer. Usually, the cooling medium is used to flow from one end to the other end of the drive motor for cooling. This cooling method leads to inconsistent temperatures of each part of the drive motor, and poor cooling effect.

[0005] SUMMARY

[0006] The present application provides a stator assembly, a drive motor, a power assembly and a vehicle which are beneficial to improve temperature uniformity.

[0007] The present application provides a stator assembly, which comprises a stator core, the stator core comprising a first end face and a second end face arranged axially opposite to each other; the stator core further comprises a first stator oil channel and a second stator oil channel for oil flow, the oil in the first stator oil channel can flow in the direction from the first end face to the second end face, and the oil in the second stator oil channel can flow in the direction from the second end face to the first end face.

[0008] In some embodiments, the number of the first stator oil channels is multiple, and the number of the stator oil channels is multiple, the total flow of the multiple first stator oil channels and the total flow of the multiple second stator oil channels are equal.

[0009] In some embodiments, the flow of any one of the first stator oil channels is equal to the flow of any one of the second stator oil channels.

[0010] In some embodiments, the stator assembly further comprises an oil guide, the oil guide being in communication with the first stator oil channel and the second stator oil channel, and the oil guide is used to deliver oil to the first stator oil channel and the second stator oil channel.

[0011] In some embodiments, the oil guide comprises a first oil guide ring and a second oil guide ring; the first oil guide ring, the stator core and the second oil guide ring are arranged in sequence along the axial direction of the stator core; the first oil guide ring is in communication with the first stator oil channel and is used to deliver oil to the first stator oil channel; the second oil guide ring is in communication with the second stator oil channel and is used to deliver oil to the second stator oil channel.

[0012] In some embodiments, the first oil guide ring and the first end face enclose a first oil guide channel, the first oil guide channel is in communication with the first stator oil channel; the second oil guide ring and the second end face enclose a second oil guide channel, the second oil guide channel is in communication with the second stator oil channel; the first oil guide ring and the second oil guide ring are both provided with oil injection ports, the oil injection port of the first oil guide ring is in communication with the second stator oil channel, and the oil injection port of the second oil guide ring is in communication with the first stator oil channel.

[0013] In some embodiments, the first oil guide ring and the second oil guide ring both comprise a first part and a second part fixedly connected, the outer diameter of the first part is smaller than the outer diameter of the second part; the first part of the first oil guide ring is in contact with the first end face, and the second part of the first oil guide ring is arranged in a spaced manner with the first end face, and the first oil guide channel is arranged between the second part of the first oil guide ring and the first end face; the first part of the second oil guide ring is in contact with the second end face, and the second part of the second oil guide ring is arranged in a spaced manner with the second end face, and the second oil guide channel is arranged between the second part of the second oil guide ring and the second end face.

[0014] In some embodiments, the first part of the first oil guide ring and the second oil guide ring is provided with a first communication groove and a second communication groove, the first communication groove and the second communication groove are arranged in a spaced manner, the first communication groove of the first oil guide ring is arranged in a spaced manner with the second communication groove of the second oil guide ring, and the second communication groove of the first oil guide ring is arranged in a spaced manner with the first communication groove of the second oil guide ring; the first communication groove of the first oil guide ring is in communication with the first oil guide channel and the first stator oil channel, and the second communication groove of the first oil guide ring is in communication with the second stator oil channel and the oil injection port of the first oil guide ring; the first communication groove of the second oil guide ring is in communication with the second oil guide channel and the second stator oil channel, and the second communication groove of the second oil guide ring is in communication with the first stator oil channel and the oil injection port of the second oil guide ring.

[0015] In some embodiments, the first communication groove and the second communication groove of the first oil guide ring are located on a side of the first oil guide channel facing the center of the first oil guide ring, and the first communication groove and the second communication groove of the second oil guide ring are located on a side of the second oil guide channel facing the center of the second oil guide ring; the oil injection port of the first oil guide ring penetrates through the second communication groove of the first oil guide ring and is arranged to face away from the inner wall of the stator core, and the oil injection port of the second oil guide ring penetrates through the second communication groove of the second oil guide ring and is arranged to face away from the inner wall of the stator core.

[0016] In some embodiments, the first portion includes a connecting portion and an extending portion, the connecting portion is arranged around the extending portion and connected thereto, and the connecting portion and the extending portion enclose the first communication groove and the second communication groove; the second portion encloses an inner cavity; the connecting portion and the second portion are arranged in axial stacking, the extending portion and the inner cavity are arranged in axial opposition, and the oil injection port penetrates through the extending portion.

[0017] In some embodiments, the oil injection port of the first oil guide ring penetrates through the extending portion of the first oil guide ring, and the central axis of the oil injection port of the first oil guide ring is arranged to be inclined relative to the axial direction of the stator core in a direction in which the first end face faces away from the second end face; the oil injection port of the second oil guide ring penetrates through the extending portion of the second oil guide ring, and the central axis of the oil injection port of the second oil guide ring is arranged to be inclined relative to the axial direction of the stator core in a direction in which the second end face faces away from the first end face.

[0018] In some embodiments, the inclination angle of the central axis of the oil injection port of the first oil guide ring relative to the axial direction of the stator core is in the range of [70°, 80°], and the inclination angle of the central axis of the oil injection port of the second oil guide ring relative to the axial direction of the stator core is in the range of [70°, 80°].

[0019] In some embodiments, the first stator oil channel and the second stator oil channel both extend along the axial direction of the stator core.

[0020] In some embodiments, the size of the first stator oil channel along the circumferential direction of the stator core gradually decreases in a direction from the outside of the stator core to the inside of the stator core along the radial direction of the stator core, and the size of the second stator oil channel along the circumferential direction of the stator core gradually decreases in a direction from the outside of the stator core to the inside of the stator core along the radial direction of the stator core.

[0021] In some embodiments, the stator assembly further comprises a winding, the stator core has a hollow cavity, an inner side wall of the hollow cavity is provided with a plurality of winding posts arranged in sequence along the circumference of the stator core, and the winding is arranged around the winding posts. The first stator oil channel and the second stator oil channel both extend to the winding posts in the radial direction of the stator core.

[0022] The application provides a driving motor, which comprises the stator assembly described in the above embodiments.

[0023] In some embodiments, the driving motor further comprises a housing, the housing has a receiving cavity and an oil outlet channel arranged in communication, and the stator assembly is accommodated in the receiving cavity. An oil inlet channel is formed between the circumferential side wall of the stator assembly and the inner side of the housing, the oil inlet channel is in communication with the first oil guide channel of the stator assembly, and the oil inlet channel is in communication with the second oil guide channel of the stator assembly.

[0024] In some embodiments, the oil outlet channel comprises a first oil outlet and a second oil outlet. The first oil outlet is arranged at a position close to the first end face of the stator core of the housing, and is used for allowing the oil flowing out of the second stator oil channel to flow out. The second oil outlet is arranged at a position close to the second end face of the stator core of the housing, and is used for allowing the oil flowing out of the first stator oil channel to flow out.

[0025] The application provides a power assembly, which comprises the driving motor described in the above embodiments.

[0026] In some embodiments, the power assembly further comprises an oil storage tank and a driving pump. The oil storage tank is in communication with the oil outlet channel of the driving motor and is used for collecting oil. The driving pump is connected to the oil storage tank and the oil inlet channel of the driving motor. The oil flowing out of the driving motor flows to the oil storage tank, and the oil cooled in the oil storage tank flows into the oil inlet channel of the driving motor through the driving pump.

[0027] The application further provides a vehicle, which comprises the power assembly described in the above embodiments.

[0028] The stator assembly provided by the application comprises a stator core, the stator core comprises a first end face and a second end face arranged opposite along the axial direction thereof, and further comprises a first stator oil channel and a second stator oil channel for allowing oil to flow therethrough. The oil in the first stator oil channel flows in the direction from the first end face to the second end face, and the oil in the second stator oil channel flows in the direction from the second end face to the first end face, thereby forming bidirectional and intersecting oil channels. The bidirectional and intersecting oil channels can make the temperature distribution of the stator core after cooling uniform, and the cooling effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments provided by the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0030] Fig. 1 is a cross-sectional view of a driving motor at a second stator oil passage according to some embodiments of the present application;

[0031] Fig. 2 is a cross-sectional view of a driving motor at a first stator oil passage according to some embodiments of the present application;

[0032] Fig. 3 is an oil circuit diagram of a driving motor according to some embodiments of the present application;

[0033] Fig. 4 is a structural diagram of a first oil guide ring according to some embodiments of the present application;

[0034] Fig. 5 is a left view of a first oil guide ring according to some embodiments of the present application;

[0035] Fig. 6 is a right view of a first oil guide ring according to some embodiments of the present application;

[0036] Fig. 7 is a partial enlarged view of the first oil guide ring shown in Fig. 6 at A;

[0037] Fig. 8 is a cross-sectional view of a first oil guide ring according to some embodiments of the present application;

[0038] Fig. 9 is a structural diagram of a stator core according to some embodiments of the present application;

[0039] Fig. 10 is a front view of a stator core according to some embodiments of the present application;

[0040] Fig. 11 is a partial enlarged view of the stator core shown in Fig. 10 at B;

[0041] Fig. 12 is an oil flow diagram of a power assembly according to some embodiments of the present application.

[0042] Explanation of reference signs: driving motor-1000; stator assembly-100; stator core-10; first end face-10a; second end face-10b; first stator oil passage-11; second stator oil passage-12; hollow cavity-13; winding post-14; first oil guide ring-20; first oil guide passage-20a; second oil guide ring-30; second oil guide passage-30a; winding-40; oil injection port-51; first portion-52; connecting portion 522; extension-524; second portion-53; first communication groove-54; second communication groove-55; housing-200; accommodating cavity-201; oil outlet passage-202; first oil outlet-202a; second oil outlet-202b; oil inlet passage-203; rotor-300; rotating shaft-400; magnetic isolation plate-500. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] The following description of each embodiment is made with reference to the additional drawings, which are used to illustrate specific embodiments that can be used to implement the present application. The directional language mentioned in the description of the present application, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "top surface", "side surface", "bottom surface", "top wall", "side wall", "bottom wall", "inner side wall", "outer side wall", "length direction", "width direction", "height direction", etc., are only the directions of the additional drawings, therefore, the directional language used is to better, more clearly illustrate and understand the present application, and is not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, for example, "first", "second", "third", "fourth", etc., are only used to distinguish the described objects, and do not have any sequential or technical meaning. In the description of the present application, "connection", "coupling", etc., unless otherwise specified, include direct connection (coupling) and indirect connection (coupling).

[0045] The present application provides a vehicle, the vehicle comprising a power assembly and wheels, the power assembly being configured to drive the wheels of the vehicle to rotate.

[0046] The present application provides a power assembly, the power assembly comprising a driving motor and a transmission structure. The driving motor is configured to transmit power to the wheels via the transmission structure.

[0047] Please refer to Fig. 1, which is a cross-sectional view of a driving motor at a second stator oil channel according to some embodiments of the present application.

[0048] The present application also provides a driving motor 1000, which comprises a stator assembly 100, a housing 200, a rotor 300, a rotating shaft 400 and a magnetic isolation plate 500. The housing 200 has a receiving cavity 201 and an oil outlet passage 202, and the oil outlet passage 202 is in communication with the receiving cavity 201. The stator assembly 100 is received in the receiving cavity 201 of the housing 200. The rotor 300 is arranged in the stator assembly 100 and can rotate relative to the stator assembly 100. The rotating shaft 400 penetrates the rotor 300 and is fixedly connected with the rotor 300, and the rotor 300 drives the rotating shaft 400 to rotate. The magnetic isolation plate 500 is arranged between the rotating shaft 400 and the stator assembly 100, and the magnetic isolation plate 500 is arranged at opposite ends of the rotor 300 along the axial direction of the stator assembly 100. The inner side wall of the housing 200 and the circumferential side wall of the stator assembly 100 are spaced apart to form an oil inlet passage 203, and the oil inlet passage 203 is connected with a driving pump. The oil inlet passage 203 is used for flowing the oil from outside the driving motor 1000 to inside the stator assembly 100. The oil outlet passage 202 is in communication with the oil storage groove, and the oil outlet passage 202 is used for flowing the oil from the stator assembly 100 of the driving motor 1000 to the oil storage groove of the housing 200 of the driving motor 1000, so that the driving pump can deliver the oil into the driving motor 1000 again to cool the stator assembly 100.

[0049] In the driving motor 1000, the cooling medium is usually used to flow from one end of the driving motor 1000 to the other end for cooling. This cooling method causes the temperature of each part of the driving motor 1000 to be inconsistent, and the cooling effect is poor.

[0050] Please refer to Figs. 1 to 3, Fig. 2 is a cross-sectional view of a driving motor at a first stator oil channel according to some embodiments of the present application, and Fig. 3 is an oil circuit diagram of a driving motor according to some embodiments of the present application. In view of the above technical problems, the stator assembly 100 of the present application comprises a stator core 10, and the stator core 10 comprises a first end face 10a and a second end face 10b arranged opposite along the axial direction of the stator core 10. The stator core 10 comprises a first stator oil channel 11 and a second stator oil channel 12 for flowing the oil, and the oil in the first stator oil channel 11 can flow in the direction from the first end face 10a to the second end face 10b. The oil in the second stator oil channel 12 can flow in the direction from the second end face 10b to the first end face 10a.

[0051] The stator assembly 100 provided in the application, through the oil in the first stator oil channel 11 flowing in the direction from the first end surface 10a to the second end surface 10b, the oil in the second stator oil channel 12 flowing in the direction from the second end surface 10b to the first end surface 10a, the flowing direction of the oil in the first stator oil channel 11 and the flowing direction of the oil in the second stator oil channel 12 being opposite, so that the stator core 10 forms a bidirectional cross oil circuit design, which can reduce the local highest hot spot of the stator core 10, so that the temperature distribution of the stator core 10 is more uniform, thereby facilitating to improve the temperature uniformity of the stator assembly 100.

[0052] In the embodiment, the first stator oil channel 11 and the second stator oil channel 12 both pass through the first end surface 10a and the second end surface 10b of the stator core 10, and the oil in the first stator oil channel 11 can flow from the first end surface 10a to the second end surface 10b, and the oil in the second stator oil channel 12 can flow from the second end surface 10b to the first end surface 10a. It can be understood that, in some possible implementations, the first stator oil channel 11 is provided with a flow-through opening, and the flow-through opening of the first stator oil channel 11 is located between the first end surface 10a and the second end surface 10b in the axial direction of the stator core 10, and the oil flows into the first stator oil channel 11 from the flow-through opening of the first stator oil channel 11 and then flows to the first end surface 10a and the second end surface 10b in the first stator oil channel 11. The second stator oil channel 12 is provided with a flow-through opening, and the flow-through opening of the second stator oil channel 12 is located between the first end surface 10a and the second end surface 10b in the axial direction of the stator core 10, and the oil flows into the second stator oil channel 12 from the flow-through opening of the second stator oil channel 12 and then flows to the first end surface 10a and the second end surface 10b in the second stator oil channel 12, so that at least part of the oil in the first stator oil channel 11 can flow in the direction from the first end surface 10a to the second end surface 10b. At least part of the oil in the second stator oil channel 12 can flow in the direction from the second end surface 10b to the first end surface 10a.

[0053] The stator assembly 100 provided in the embodiment further includes an oil guide. The oil guide is in communication with the first stator oil channel 11 and the second stator oil channel 12, and the oil guide is used to deliver oil to the first stator oil channel 11 and the second stator oil channel 12.

[0054] The stator assembly 100 provided in the embodiment further includes a winding 40 arranged around the stator core 10. The oil guide includes a first oil guide ring 20 and a second oil guide ring 30. The first oil guide ring 20, the stator core 10 and the second oil guide ring 30 are sequentially arranged in the axial direction of the stator core 10, and the winding 40 is arranged around the stator core 10. The first oil guide ring 20 is in communication with the first stator oil channel 11, and the first oil guide ring 20 is used to deliver oil to the first stator oil channel 11. The second oil guide ring 30 is in communication with the second stator oil channel 12, and the second oil guide ring 30 is used to deliver oil to the second stator oil channel 12.

[0055] The first oil guide ring 20 is arranged on the first end surface 10a, and the first oil guide ring 20 and the first end surface 10a form a first oil guide channel 20a, and the first oil guide channel 20a is in communication with the first stator oil channel 11. The second oil guide ring 30 is arranged on the second end surface 10b, and the second oil guide ring 30 and the second end surface 10b form a second oil guide channel 30a, and the second oil guide channel 30a is in communication with the second stator oil channel 12.

[0056] The first oil guide ring 20 and the second oil guide ring 30 are both provided with oil injection ports 51, the oil injection ports 51 of the first oil guide ring 20 are in communication with the second stator oil channel 12, and the oil injection ports 51 of the second oil guide ring 30 are in communication with the first stator oil channel 11.

[0057] Part of the oil flows into the first oil guide channel 20a from the first end surface 10a of the stator core 10, flows to the second end surface 10b of the stator core 10 through the first stator oil channel 11, and finally flows out from the oil injection ports 51 of the second oil guide ring 30 and sprays onto the windings 40 arranged on the second end surface 10b. Another part of the oil flows into the second oil guide channel 30a from the second end surface 10b of the stator core 10, flows to the first end surface 10a of the stator core 10 through the second stator oil channel 12, and finally flows out from the oil injection ports 51 of the first oil guide ring 20 and sprays onto the windings 40 arranged on the first end surface 10a.

[0058] The stator assembly 100 provided by the present application penetrates the first end surface 10a and the second end surface 10b of the stator core 10 through the first stator oil channel 11 and the second stator oil channel 12, and the first oil guide channel 20a formed by the first end surface 10a of the stator core 10 and the first oil guide ring 20 is in communication with the first stator oil channel 11, and the second oil guide channel 30a formed by the second end surface 10b of the stator core 10 and the second oil guide ring 30 is in communication with the second stator oil channel 12, so that the stator core 10 forms a bidirectional cross oil circuit design, that is, the oil in the first stator oil channel 11 flows from the first end surface 10a to the second end surface 10b, and the oil in the second stator oil channel 12 flows from the second end surface 10b to the first end surface 10a. The bidirectional cross oil circuit design can reduce the local highest hot spot of the stator core 10, so that the temperature distribution of the stator core 10 is more uniform.

[0059] Through the design of the first oil guide ring 20 and the second oil guide ring 30, the first oil guide channel 20a formed by the first oil guide ring 20 and the first end surface 10a is directly in communication with the first stator oil channel 11, and the second oil guide channel 30a formed by the second oil guide ring 30 and the second end surface 10b is directly in communication with the second stator oil channel 12, so that the flow channel of the oil flowing into the interior of the stator core 10 is reduced and the flow resistance is low, which is beneficial to improve the flow speed of the oil in the interior of the stator core 10, and further ensure the cooling and heat dissipation effect of the oil on the stator core 10.

[0060] Through the design of the oil injection port 51, the opening of the first stator oil channel 11 at the second end surface 10b is communicated with the oil injection port 51 arranged on the second oil guide ring 30, and the opening of the second stator oil channel 12 at the first end surface 10a is communicated with the oil injection port 51 arranged on the first oil guide ring 20, so that the oil can be uniformly injected to the winding 40 arranged on the stator core 10, the winding 40 can be kept at a lower temperature in each flow range of the oil, the motor power formed by the stator assembly 100 can be greatly improved, the motor power density formed by the stator assembly 100 is improved, and the working efficiency of the driving motor 1000 with the stator assembly 100 is improved.

[0061] The first oil guide channel 20a formed by the first oil guide ring 20 and the first end surface 10a is communicated with the first stator oil channel 11, and the second oil guide channel 30a formed by the second oil guide ring 30 and the second end surface 10b is communicated with the second stator oil channel 12, so that the oil channel is not arranged on the circumferential wall of the stator core 10, and the electromagnetic performance of the stator core 10 is not affected.

[0062] Please refer to FIG. 1 again. In an embodiment, the oil outlet passage 202 of the housing 200 includes a first oil outlet 202a and a second oil outlet 202b. The first oil outlet 202a is arranged at a position close to the first end surface 10a of the stator core 10, and is used for the oil flowing out from the second stator oil channel 12 to the accommodating cavity 201 of the housing 200. The second oil outlet 202b is arranged at a position close to the second end surface 10b of the stator core 10, and is used for the oil flowing out from the first stator oil channel 11 to the accommodating cavity 201 of the housing 200. The oil flowing out from the first oil outlet 202a and the second oil outlet 202b finally flows into the oil storage tank. The oil in the oil storage tank is again delivered to the oil inlet passage 203 of the driving motor 1000 by the driving pump.

[0063] Please refer to FIGS. 1 to 8. FIG. 4 is a structural diagram of a first oil guide ring according to some embodiments of the present application, FIG. 5 is a left view of the first oil guide ring according to some embodiments of the present application, FIG. 6 is a right view of the first oil guide ring according to some embodiments of the present application, FIG. 7 is a partial enlarged view of the first oil guide ring shown in FIG. 6 at A, and FIG. 8 is a sectional view of the first oil guide ring according to some embodiments of the present application.

[0064] In an embodiment, the first oil guide ring 20 and the second oil guide ring 30 each comprise a first portion 52 and a second portion 53 fixedly connected, the first portion 52 has an outer diameter smaller than that of the second portion 53, and the first portion 52 is provided with an oil injection port 51. The first portion 52 of the first oil guide ring 20 is in contact with the first end surface 10a, and the second portion 53 of the first oil guide ring 20 is spaced apart from the first end surface 10a and enclosed with the housing 200 to form a first oil guide channel 20a, the first oil guide channel 20a is in communication with the first stator oil channel 11, the oil injection port 51 of the first oil guide channel 20a is in communication with the second stator oil channel 12, and the first oil guide channel 20a is separated from the second stator oil channel 12. The first portion 52 of the second oil guide ring 30 is in contact with the second end surface 10b, and the second portion 53 of the second oil guide ring 30 is spaced apart from the second end surface 10b and enclosed with the housing 200 to form a second oil guide channel 30a, the second oil guide channel 30a is separated from the first stator oil channel 11, the second oil guide channel 30a is in communication with the second stator oil channel 12, and the oil injection port 51 of the second oil guide channel 30a is in communication with the first stator oil channel 11.

[0065] In some embodiments, the first portion 52 of the first oil guide ring 20 and the second portion 53 of the first oil guide ring 20 are integrally formed, and the first portion 52 of the second oil guide ring 30 and the second portion 53 of the second oil guide ring 30 are integrally formed. The first portion 52 has a ring shape, and the second portion 53 has a ring shape. The second portion 53 of the first oil guide ring 20 is spaced apart from the first end surface 10a to form a ring-shaped first oil guide channel 20a, and the second portion 53 of the second oil guide ring 30 is spaced apart from the second end surface 10b to form a ring-shaped second oil guide channel 30a.

[0066] The stator assembly 100 provided by the embodiment has the following advantages. On the one hand, the second portion 53 of the first oil guide ring 20 is spaced apart from the first end surface 10a and enclosed with the housing 200 to form the first oil guide channel 20a in communication with the first stator oil channel 11, and the second portion 53 of the second oil guide ring 30 is spaced apart from the second end surface 10b and enclosed with the housing 200 to form the second oil guide channel 30a in communication with the second stator oil channel 12, so that the stator core 10 forms an oil path with a bidirectional cross design, which is conducive to reducing the local maximum hot spot of the stator core 10 and making the temperature distribution of the stator core 10 more uniform. Moreover, the oil channel can be avoided on the circumferential wall of the stator core 10, and the electromagnetic performance of the stator core 10 will not be affected. On the other hand, part of the oil flows into the first stator oil channel 11 through the first oil guide channel 20a, and another part of the oil flows into the second stator oil channel 12 through the second oil guide channel 30a, so that the flow path of the oil flowing into the interior of the stator core 10 is reduced and the flow resistance is low, which is conducive to improving the flow speed of the oil in the interior of the stator core 10, and further ensuring the cooling and heat dissipation effect of the oil on the stator core 10.

[0067] It should be understood that the first oil guide ring 20 and the second oil guide ring 30 have the same structure, and the structure of the second oil guide ring 30 will be described with reference to FIGS. 4 to 8.

[0068] Referring to FIGS. 1 to 8, in an embodiment, the first oil guide ring 20 and the second oil guide ring 30 each have a first portion 52, a first communication groove 54, and a second communication groove 55. The first communication groove 54 and the second communication groove 55 are arranged at intervals. The first communication groove 54 of the first oil guide ring 20 is arranged opposite the second communication groove 55 of the second oil guide ring 30, and the second communication groove 55 of the first oil guide ring 20 is arranged opposite the first communication groove 54 of the second oil guide ring 30. The first communication groove 54 of the first oil guide ring 20 communicates the first oil guide 20a and the first stator oil passage 11, and the second communication groove 55 of the first oil guide ring 20 communicates the second stator oil passage 12 and the oil injection port 51 of the first oil guide ring 20. The first communication groove 54 of the second oil guide ring 30 communicates the second oil guide 30a and the second stator oil passage 12, and the second communication groove 55 of the second oil guide ring 30 communicates the first stator oil passage 11 and the oil injection port 51 of the second oil guide ring 30.

[0069] In some embodiments, the first communication groove 54 of the first oil guide ring 20 has two openings. One of the openings of the first communication groove 54 of the first oil guide ring 20 is arranged on the circumferential side wall of the first portion 52 of the first oil guide ring 20 and communicates the first oil guide 20a. The other of the openings of the first communication groove 54 of the first oil guide ring 20 is arranged on the end surface of the first portion 52 of the first oil guide ring 20 facing the first end surface 10a of the stator core 10 and communicates the first stator oil passage 11. The second communication groove 55 of the first oil guide ring 20 has one opening. The opening of the second communication groove 55 of the first oil guide ring 20 is arranged on the end surface of the first portion 52 of the first oil guide ring 20 facing the first end surface 10a of the stator core 10 and communicates the second stator oil passage 12. The oil injection port 51 of the first oil guide ring 20 communicates the second communication groove 55 of the first oil guide ring 20 and the accommodating cavity 201 of the housing 200.

[0070] In some embodiments, the first communication groove 54 of the second oil guide ring 30 has two openings, one of the openings of the first communication groove 54 of the second oil guide ring 30 is arranged on the circumferential side wall of the first part 52 of the second oil guide ring 30 and communicates with the second oil guide channel 30a, and the other of the openings of the first communication groove 54 of the second oil guide ring 30 is arranged on the end face of the first part 52 of the second oil guide ring 30 facing the second end face 10b of the stator core 10 and communicates with the first stator oil channel 11. The second communication groove 55 of the second oil guide ring 30 has one opening, the opening of the second communication groove 55 of the second oil guide ring 30 is arranged on the end face of the first part 52 of the second oil guide ring 30 facing the second end face 10b of the stator core 10 and communicates with the first stator oil channel 11. The oil injection port 51 of the second oil guide ring 30 communicates the second communication groove 55 of the second oil guide ring 30 with the accommodating cavity 201 of the housing 200.

[0071] The stator assembly 100 provided by the embodiments has the following advantages. The first communication groove 54 and the second communication groove 55 are arranged on the first oil guide ring 20 and the second oil guide ring 30 at the same time, the first communication groove 54 on the first oil guide ring 20 communicates the first oil guide channel 20a with the first stator oil channel 11, and the second communication groove 55 of the second oil guide ring 30 is blocked from the first oil guide channel 20a. The first communication groove 54 of the second oil guide ring 30 communicates the second oil guide channel 30a with the second stator oil channel 12, and the second communication groove 55 of the second oil guide ring 30 is blocked from the second oil guide channel 30a. In this way, the oil in the first stator oil channel 11 and the second stator oil channel 12 forms a bidirectional cross design oil path, that is, the stator core 10 forms a bidirectional cross design oil path, which is beneficial to reduce the local maximum hot spot of the stator core 10 and make the temperature distribution of the stator core 10 more uniform.

[0072] Please refer to FIGS. 1-11, FIG. 9 is a structural diagram of a stator core provided by some embodiments of the present application, FIG. 10 is a front view of a stator core provided by some embodiments of the present application, and FIG. 11 is a partial enlarged view of the stator core shown in FIG. 10 at B.

[0073] In this embodiment, the stator core 10 is provided with a plurality of first stator oil channels 11 and a plurality of second stator oil channels 12, and the plurality of first stator oil channels 11 and the plurality of second stator oil channels 12 are alternately and sequentially arranged along the circumference of the stator core 10. Correspondingly, the first part 52 of the first oil guide ring 20 is provided with a plurality of first communication grooves 54 and a plurality of second communication grooves 55, and the plurality of first communication grooves 54 and the plurality of second communication grooves 55 are alternately and sequentially arranged along the circumference of the first part 52 of the first oil guide ring 20. The first part 52 of the second oil guide ring 30 is provided with a plurality of first communication grooves 54 and a plurality of second communication grooves 55, and the plurality of first communication grooves 54 and the plurality of second communication grooves 55 are alternately and sequentially arranged along the circumference of the first part 52 of the second oil guide ring 30. Correspondingly, the first part 52 of the first oil guide ring 20 is provided with a plurality of oil injection ports 51, and the plurality of oil injection ports 51 on the first oil guide ring 20 are arranged along the circumference of the first part 52 of the first oil guide ring 20. The first part 52 of the second oil guide ring 30 is provided with a plurality of oil injection ports 51, and the plurality of oil injection ports 51 on the second oil guide ring 30 are arranged along the circumference of the first part 52 of the second oil guide ring 30.

[0074] Among them, one first communication groove 54 on the first oil guide ring 20 communicates one first stator oil channel 11 and the first oil guide 20a, one second communication groove 55 on the first oil guide ring 20 communicates one second stator oil channel 12, and one oil injection port 51 on the first oil guide ring 20 communicates one second communication groove 55 on the first oil guide ring 20 and the accommodating cavity 201 of the shell 200. One first communication groove 54 on the second oil guide ring 30 communicates one second stator oil channel 12 and the second oil guide 30a, one second communication groove 55 on the second oil guide ring 30 communicates one first stator oil channel 11, and one oil injection port 51 on the second oil guide ring 30 communicates one second communication groove 55 on the second oil guide ring 30 and the accommodating cavity 201 of the shell 200.

[0075] Through the arrangement of the plurality of first stator oil channels 11 and the plurality of second stator oil channels 12, the stator core 10 has a plurality of bidirectional cross design oil paths, so that the cooling and heat dissipation efficiency of the oil liquid to the stator core 10 and the winding 40 is higher, and the plurality of bidirectional cross design oil paths arranged in a dispersed manner makes the temperature distribution of the stator core 10 more uniform. At the same time, through the design of the plurality of oil injection ports 51, the oil liquid sprayed out of the oil injection ports 51 can cover the entire winding 40 of the stator assembly 100, so that the cooling and heat dissipation of the oil liquid to the stator assembly 100 is more uniform.

[0076] It needs to be understood that, in some other embodiments, for example, two first stator oil channels 11 and two second stator oil channels 12 are alternately and sequentially arranged along the circumference of the stator core 10. Correspondingly, two first communication grooves 54 and two second communication grooves 55 on the first oil guide ring 20 are alternately and sequentially arranged along the circumference, and two first communication grooves 54 and two second communication grooves 55 on the second oil guide ring 30 are alternately and sequentially arranged along the circumference. Alternatively, three first stator oil channels 11 and three second stator oil channels 12 are alternately and sequentially arranged along the circumference of the stator core 10. Correspondingly, three first communication grooves 54 and three second communication grooves 55 on the first oil guide ring 20 are alternately and sequentially arranged along the circumference, and three first communication grooves 54 and three second communication grooves 55 on the second oil guide ring 30 are alternately and sequentially arranged along the circumference, which is not limited in the present application.

[0077] In some embodiments, the stator assembly 100 provided by the present embodiment has a plurality of first stator oil channels 11 and a plurality of second stator oil channels 12, and the plurality of first stator oil channels 11 and the plurality of second stator oil channels 12 are alternately and sequentially arranged along the circumference of the stator core 10, and the total flow of the plurality of first stator oil channels 11 is equal to the total flow of the plurality of second stator oil channels 12. By alternately and sequentially arranging the plurality of first stator oil channels 11 and the plurality of second stator oil channels 12 along the circumference of the stator core 10, the cooling and heat dissipation area formed by the oil covering the stator core 10 is wider, which can reduce the local hot spots of the stator core 10, and thus the cooling and heat dissipation effect of the stator core 10 is better, and the heat dissipation is more uniform.

[0078] In some embodiments, 36 first stator oil channels 11 and 36 second stator oil channels 12 are arranged on the stator core 10, and the 36 first stator oil channels 11 and the 36 second stator oil channels 12 are alternately and sequentially arranged along the circumference of the stator core 10. Correspondingly, 36 first communication grooves 54 and 36 second communication grooves 55 are arranged on the first part 52 of the first oil guide ring 20, and the 36 first communication grooves 54 and the 36 second communication grooves 55 are alternately and sequentially arranged along the circumference of the first part 52 of the first oil guide ring 20. 36 first communication grooves 54 and 36 second communication grooves 55 are arranged on the first part 52 of the second oil guide ring 30, and the 36 first communication grooves 54 and the 36 second communication grooves 55 are alternately and sequentially arranged along the circumference of the first part 52 of the second oil guide ring 30. Correspondingly, 36 oil injection ports 51 are arranged on the first part 52 of the first oil guide ring 20, and the 36 oil injection ports 51 on the first oil guide ring 20 are arranged along the circumference of the first part 52 of the first oil guide ring 20. 36 oil injection ports 51 are arranged on the first part 52 of the second oil guide ring 30, and the 36 oil injection ports 51 on the second oil guide ring 30 are arranged along the circumference of the first part 52 of the second oil guide ring 30. It should be understood that the cross-sectional view of the drive motor 1000 shown in FIG. 2 is a cross-sectional view of two views separated by 5° from the cross-sectional view of the drive motor 1000 shown in FIG. 1.

[0079] In some embodiments, the oil flow of any one first stator oil channel 11 and the oil flow of any one second stator oil channel 12 are equal, so that the first stator oil channel 11 and the second stator oil channel 12 are more uniform in heat dissipation to the stator core 10.

[0080] It can be understood that in some other embodiments, the number of first stator oil channels 11 and second stator oil channels 12 arranged on the stator core 10 includes but is not limited to 1, 3, 6, 12, etc., the number of first communication grooves 54 and second communication grooves 55 arranged on the first part 52 of the first oil guide ring 20 includes but is not limited to 1, 3, 6, 12, etc., the number of first communication grooves 54 and second communication grooves 55 arranged on the first part 52 of the second oil guide ring 30 includes but is not limited to 1, 3, 6, 12, etc., the number of oil injection ports 51 arranged on the first part 52 of the first oil guide ring 20 includes but is not limited to 1, 3, 6, 12, etc., and the number of oil injection ports 51 arranged on the first part 52 of the second oil guide ring 30 includes but is not limited to 1, 3, 6, 12, etc. The present application does not limit this.

[0081] Referring to FIGS. 1-9, in one embodiment, the first portion 52 includes a connecting portion 522 and an extending portion 524, the connecting portion 522 is arranged around and connected to the extending portion 524, and the connecting portion 522 and the extending portion 524 enclose the first communication groove 54 and the second communication groove 55. The second portion 53 encloses an inner cavity. The connecting portion 522 and the second portion 53 are arranged in an axial stack, the extending portion 524 and the inner cavity are arranged in a radial opposition, and the oil injection port 51 is arranged through the extending portion 524.

[0082] The oil injection port 51 of the first oil guide ring 20 is arranged through the extending portion 524 of the first oil guide ring 20, and the central axis of the oil injection port 51 of the first oil guide ring 20 is arranged in an axial inclination relative to the stator core 10 in a direction in which the first end surface 10a faces away from the second end surface 10b. The oil injection port 51 of the second oil guide ring 30 is arranged through the extending portion 524 of the second oil guide ring 30, and the central axis of the oil injection port 51 of the second oil guide ring 30 is arranged in an axial inclination relative to the stator core 10 in a direction in which the second end surface 10b faces away from the first end surface 10a. The axial inclination of the oil injection port 51 of the first oil guide ring 20 is conducive to the precision of the oil in the second stator oil channel 12 being injected by the oil injection port 51 of the first oil guide ring 20 to the center of the winding 40 on the side of the stator core 10 close to the first end surface 10a, thereby facilitating the improvement of the cooling efficiency of the drive motor 1000. The axial inclination of the oil injection port 51 of the second oil guide ring 30 is conducive to the precision of the oil in the first stator oil channel 11 being injected by the oil injection port 51 of the second oil guide ring 30 to the center of the winding 40 on the side of the stator core 10 close to the second end surface 10b, thereby facilitating the improvement of the cooling efficiency of the drive motor 1000.

[0083] The inclination angle of the oil injection port 51 of the first oil guide ring 20 relative to the axial direction is in the range of [70°, 80°]. The oil injection port 51 of the second oil guide ring 30 penetrates the first portion 52 of the second oil guide ring 30, and the inclination angle of the oil injection port 51 of the second oil guide ring 30 relative to the axial direction is in the range of [70°, 80°] in the direction away from the second end surface 10b. The oil injection port 51 of the first oil guide ring 20 is inclined from outside to inside in the direction away from the first end surface 10a, and the inclination angle of the oil injection port 51 of the first oil guide ring 20 relative to the axial direction is in the range of [70°, 80°], so that the oil in the second stator oil channel 12 can be precisely sprayed by the oil injection port 51 of the first oil guide ring 20 to the center of the winding 40 on the side of the stator core 10 close to the first end surface 10a. The oil injection port 51 of the second oil guide ring 30 is inclined from outside to inside in the direction away from the second end surface 10b, and the inclination angle of the oil injection port 51 of the second oil guide ring 30 relative to the axial direction is in the range of [70°, 80°], so that the oil in the first stator oil channel 11 can be precisely sprayed by the oil injection port 51 of the second oil guide ring 30 to the center of the winding 40 on the side of the stator core 10 close to the second end surface 10b. In this way, the cooling and heat dissipation area formed by the oil covering the stator assembly 100 can be wider, the local hot spots of the stator assembly 100 can be reduced, and the cooling and heat dissipation effect of the stator assembly 100 is better.

[0084] Please refer to FIGS. 1-9, in an embodiment, the oil injection port 51 on the first oil guide ring 20 and the oil injection port 51 on the second oil guide ring 30 are both circular holes, and the diameter of the oil injection port 51 on the first oil guide ring 20 and the oil injection port 51 on the second oil guide ring 30 is in the range of [0.8mm, 1.5mm]. By limiting the diameter of the oil injection port 51 on the first oil guide ring 20 and the oil injection port 51 on the second oil guide ring 30 in the range of [0.8mm, 1.5mm], the flow rate of the oil sprayed through the oil injection port 51 can be greatly increased, the influence of inertia on the oil sprayed through the oil injection port 51 can be reduced, and thus the oil can be precisely sprayed onto the winding 40 of the stator assembly 100 during high-speed rotation of the drive motor 1000.

[0085] Please refer to FIG. 1 to FIG. 11, in an embodiment, the first stator oil channel 11 and the second stator oil channel 12 both extend along the axial direction of the stator core 10, the first stator oil channel 11 penetrates the first end surface 10a and the second end surface 10b of the stator core 10, and the second stator oil channel 12 penetrates the first end surface 10a and the second end surface 10b of the stator core 10. By extending along the axial direction of the stator core 10, the first stator oil channel 11 and the second stator oil channel 12 can reduce the curved flow path and the flow resistance in the process of flowing into the stator core 10, which is beneficial to improve the flow speed of the oil in the stator core 10, and further ensure the cooling effect of the oil on the stator core 10. On the other hand, the structure of the plurality of stator core sheets forming the stator core 10 is the same, and only one stator core sheet mold is needed, which is beneficial to reduce the manufacturing cost of the stator core sheet.

[0086] Please refer to FIG. 1 to FIG. 11, in an embodiment, the size of the first stator oil channel 11 gradually decreases along the radial direction of the stator core 10 from the outside to the inside, and the size of the second stator oil channel 12 gradually decreases along the radial direction of the stator core 10 from the outside of the stator core 10 to the inside of the stator core 10. Since the stator core 10 is annular, by gradually decreasing the size of the first stator oil channel 11 and the second stator oil channel 12 along the radial direction of the stator core 10 from the outside of the stator core 10 to the inside of the stator core 10, the shape of the stator core 10 is matched, so that the cooling of the oil on the stator core 10 is more uniform.

[0087] Please refer to FIG. 1 to FIG. 11, in an embodiment, the stator core 10 has a hollow cavity 13, a plurality of winding posts 14 are arranged on the inner side wall of the hollow cavity 13 forming the stator core 10, and the winding 40 is wound on the winding post 14. The first stator oil channel 11 and the second stator oil channel 12 both extend to the winding post 14 in the radial direction of the stator core 10. By extending to the winding post 14, the first stator oil channel 11 and the second stator oil channel 12 can make the cooling effect of the oil on the position close to the center of the stator core 10 better, which is beneficial to reduce the phenomenon of local hot spots of the stator core 10, and make the cooling of the oil on the stator core 10 more uniform.

[0088] Please refer to FIG. 1 to FIG. 12, FIG. 12 is an oil flow diagram of a power assembly provided in some embodiments of the application.

[0089] The oil in the oil tank enters the driving motor 1000 from the oil inlet channel 203 by the driving pump. Part of the oil enters the first stator oil channel 11 through the first oil guide channel 20a formed by the first oil guide ring 20 and the stator core 10, and then is sprayed onto the winding 40 from the oil injection port 51 on the second communication groove 55 on the second oil guide ring 30, and then enters the accommodating cavity 201 of the housing 200, and finally returns to the oil tank through the oil outlet channel 202. Another part of the oil enters the second stator oil channel 12 through the second oil guide channel 30a formed by the second oil guide ring 30 and the stator core 10, and then is sprayed onto the winding 40 from the oil injection port 51 on the second communication groove 55 on the first oil guide ring 20, and then enters the accommodating cavity 201 of the housing 200, and finally returns to the oil tank through the oil outlet channel 202. The above oil circuit design enables the oil to circulate to cool the stator assembly 100 of the driving motor 1000.

[0090] The above is part of the embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered to be within the scope of protection of the present application.

Claims

1. A stator assembly (100) comprising a stator core (10), the stator core (10) comprising a first end surface (10a) and a second end surface (10b) arranged axially opposite to each other, and a first stator oil passage (11) and a second stator oil passage (12) for oil flow therethrough, wherein oil in the first stator oil passage (11) is allowed to flow in a direction from the first end surface (10a) to the second end surface (10b), and oil in the second stator oil passage (12) is allowed to flow in a direction from the second end surface (10b) to the first end surface (10a). 2.The stator assembly (100) according to claim 1, wherein the first stator oil passage (11) is provided in a plurality, and the second stator oil passage (12) is provided in a plurality, the plurality of first stator oil passages (11) and the plurality of second stator oil passages (12) are arranged alternately in a circumferential direction of the stator core (10), and a total flow rate of the plurality of first stator oil passages (11) is equal to a total flow rate of the plurality of second stator oil passages (12). 3.The stator assembly (100) according to claim 1 or 2, wherein a flow rate of any one of the first stator oil passages (11) is equal to a flow rate of any one of the second stator oil passages (12). 4.The stator assembly (100) according to any one of claims 1 to 3, further comprising an oil guide member in communication with the first stator oil passage (11) and the second stator oil passage (12), the oil guide member being configured to supply oil to the first stator oil passage (11) and the second stator oil passage (12). 5.The stator assembly (100) according to claim 4, wherein the oil guide member comprises a first oil guide ring (20) and a second oil guide ring (30), the first oil guide ring (20), the stator core (10), and the second oil guide ring (30) are arranged in an axial direction of the stator core (10) in this order, the first oil guide ring (20) is in communication with the first stator oil passage (11), and the first oil guide ring (20) is configured to supply oil to the first stator oil passage (11), and the second oil guide ring (30) is in communication with the second stator oil passage (12), and the second oil guide ring (30) is configured to supply oil to the second stator oil passage (12). 6.The stator assembly (100) according to claim 5, wherein ​ ​ ​ The first oil guide ring (20) and the second oil guide ring (30) are both provided with oil injection ports (51), the oil injection port (51) of the first oil guide ring (20) is communicated with the second stator oil channel (12), and the oil injection port (51) of the second oil guide ring (30) is communicated with the first stator oil channel (11).

7. The stator assembly (100) of claim 6, wherein, The first oil guide ring (20) and the second oil guide ring (30) are both provided with oil injection ports (51), the oil injection port (51) of the first oil guide ring (20) is communicated with the second stator oil channel (12), and the oil injection port (51) of the second oil guide ring (30) is communicated with the first stator oil channel (11).

8. The stator assembly (100) of claim 7, wherein, The first oil guide ring (20) and the second oil guide ring (30) are both provided with oil injection ports (51), the oil injection port (51) of the first oil guide ring (20) is communicated with the second stator oil channel (12), and the oil injection port (51) of the second oil guide ring (30) is communicated with the first stator oil channel (11).

9. The stator assembly (100) of claim 8, wherein the first communication groove (54) and the second communication groove (55) of the first oil guide ring (20) are located on a side of the first oil guide (20a) facing the center of the first oil guide ring (20), the first communication groove (54) and the second communication groove (55) of the second oil guide ring (30) are located on a side of the second oil guide (30a) facing the center of the second oil guide ring (30); the oil injection port (51) of the first oil guide ring (20) is arranged through the second communication groove (55) of the first oil guide ring (20) and faces away from the inner wall of the stator core (10), the oil injection port (51) of the second oil guide ring (30) is arranged through the second communication groove (55) of the second oil guide ring (30) and faces away from the inner wall of the stator core (10).

10. The stator assembly (100) of claim 8 or 9, wherein the first portion (52) comprises a connecting portion (522) and an extending portion (524), the connecting portion (522) is arranged around and connected to the extending portion (524), the connecting portion (522) and the extending portion (524) form the first communication groove (54) and the second communication groove (55); the second portion (53) forms an inner cavity; the connecting portion (522) and the second portion (53) are arranged in axial stacking, the extending portion (524) and the inner cavity are arranged in axial opposition, and the oil injection port (51) is arranged through the extending portion (524).

11. The stator assembly (100) of claim 10, wherein the oil injection port (51) of the first oil guide ring (20) is arranged through the extending portion (524) of the first oil guide ring (20) and faces away from the second end surface (10b) of the stator core (10) in the direction of the first end surface (10a), the central axis of the oil injection port (51) of the first oil guide ring (20) is arranged to be inclined relative to the axial direction of the stator core (10); the oil injection port (51) of the second oil guide ring (30) is arranged through the extending portion (524) of the second oil guide ring (30) and faces away from the first end surface (10a) of the stator core (10) in the direction of the second end surface (10b), the central axis of the oil injection port (51) of the second oil guide ring (30) is arranged to be inclined relative to the axial direction of the stator core (10).

12. The stator assembly (100) of claim 11, wherein the central axis of the oil injection port (51) of the first oil guide ring (20) is arranged to be inclined relative to the axial direction of the stator core (10) at an angle in the range of [70°, 80°]; the central axis of the oil injection port (51) of the second oil guide ring (30) is arranged to be inclined relative to the axial direction of the stator core (10) at an angle in the range of [70°, 80°].

13. The stator assembly (100) of any one of claims 1 to 12, wherein the first stator oil channel (11) and the second stator oil channel (12) both extend in the axial direction of the stator core (10).

14. The stator assembly (100) of claim 13, wherein The first stator oil channel (11) gradually decreases in size along the circumferential direction of the stator core (10) from the outside of the stator core (10) to the inside of the stator core (10) in the radial direction of the stator core (10), and the second stator oil channel (12) gradually decreases in size along the circumferential direction of the stator core (10) from the outside of the stator core (10) to the inside of the stator core (10) in the radial direction of the stator core (10).

15. The stator assembly (100) according to any one of claims 1 to 14, further comprising a winding (40), the stator core (10) having a hollow cavity (13), an inner side wall of the hollow cavity (13) being provided with a plurality of winding posts (14) arranged in sequence and spaced apart along the circumferential direction of the stator core (10), the winding (40) being wound around the winding posts (14), the first stator oil channel (11) and the second stator oil channel (12) both extending to the winding posts (14) in the radial direction of the stator core (10).

16. A drive motor (1000), comprising: The stator assembly (100) according to any one of claims 1 to 15.

17. The drive motor (1000) according to claim 16, further comprising a housing (200) having a receiving cavity (201) and an oil outlet passage (202) in communication, the stator assembly (100) being received in the receiving cavity (201); an oil inlet passage (203) being formed between a circumferential side wall of the stator assembly (100) and an inner side of the housing (200), the oil inlet passage (203) being in communication with the first oil guide (20a) of the stator assembly (100), and the oil inlet passage (203) being in communication with the second oil guide (30a) of the stator assembly (100).

18. The drive motor (1000) according to claim 17, wherein The oil outlet passage (202) comprises a first oil outlet (202a) and a second oil outlet (202b), the first oil outlet (202a) being arranged at a position of the housing (200) close to the first end surface (10a) of the stator core (10), the first oil outlet (202a) being configured to allow oil flowing out of the second stator oil channel (12) to flow out, and the second oil outlet (202b) being arranged at a position of the housing (200) close to the second end surface (10b) of the stator core (10), the second oil outlet (202b) being configured to allow oil flowing out of the first stator oil channel (11) to flow out.

19. A powertrain, comprising: The drive motor (1000) according to any one of claims 16 to 18.

20. The power assembly of claim 19, further comprising an oil storage tank and a driving pump, the oil storage tank being in communication with an oil outlet channel (202) of the driving motor (1000) for collecting oil; the driving pump being connected to the oil storage tank and an oil inlet channel (203) of the driving motor (1000); the oil flowing out of the driving motor (1000) flows to the oil storage tank, and the oil cooled in the oil storage tank flows into the oil inlet channel (203) of the driving motor (1000) by the driving pump.

21. A vehicle comprising: the power assembly of claim 19 or 20.

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