Stator lamination, stator iron core, motor, power assembly and electric vehicle

Abstract

The present application relates to the technical field of motors, and in particular to a stator lamination having multiple communicating holes, a stator iron core, a motor, a power assembly and an electric vehicle. The stator lamination comprises a center hole, multiple grooves, multiple first communicating holes and multiple circulating holes. Each groove is in communication with the center hole along a radial direction of the stator lamination, and each first communicating hole, each circulating hole and each groove penetrates through the stator lamination along an axial direction of the stator lamination. Along a circumferential direction of the stator lamination, the multiple first communicating holes are arranged at intervals, the multiple circulating holes are arranged at intervals, and the multiple grooves are arranged at intervals. Along a radial direction of the stator lamination, the distance between each first communicating hole and the center hole is greater than the distance between each circulating hole and the center hole, each first communicating hole is in communication with an outer peripheral surface of the stator lamination, and the radial size of each first communicating hole is greater than or equal to the distance between the circulating holes and the outer peripheral surface of the stator lamination. A cooling working medium on the outer peripheral surface of the stator iron core can be guided into the stator iron core, thereby improving a stator iron core cooling effect.

Description

Stator laminations, stator cores, motors, powertrains, and electric vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on January 24, 2024, with application number 202410103816.0 and application name "Stator Punching, Stator Core, Motor, Powertrain and Electric Vehicle", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of motor technology, and in particular to a stator punching sheet with multiple connecting holes, a stator core, a motor, a power assembly, and an electric vehicle. Background Art

[0004] With the development of technology, the power density of motors is getting higher and higher, while the size is getting smaller and smaller. The increase in motor power density has put forward higher requirements for motor heat dissipation.

[0005] During motor operation, heat loss from the stator core is a significant source of heat. This can be achieved by oil cooling the stator through heat dissipation channels provided on the stator. However, conventional heat dissipation methods for motor stators are currently inadequate, and the cooling effect needs to be improved. Summary of the Invention

[0006] The present application provides a stator punching sheet, a stator core, a motor, a powertrain and an electric vehicle having multiple connecting holes. At least two stacked stator punching sheets can guide the cooling medium on the outer peripheral surface of the stator core into the stator core, thereby improving the cooling effect of the stator core.

[0007] In a first aspect, the present application provides a stator punching sheet that can be used as part of a stator core. The stator punching sheet includes a center hole, a plurality of grooves, a plurality of first connecting holes, and a plurality of flow holes. Each groove is connected to the center hole in the radial direction of the stator punching sheet, and each first connecting hole, each flow hole, and each groove respectively penetrates the stator punching sheet in the axial direction of the stator punching sheet. In the circumferential direction of the stator punching sheet, the plurality of first connecting holes are arranged at intervals, the plurality of flow holes are arranged at intervals, and the plurality of grooves are arranged at intervals. In the radial direction of the stator punching sheet, the spacing between each first connecting hole and the center hole is greater than the spacing between each flow hole and the center hole, each first connecting hole is connected to the outer peripheral surface of the stator punching sheet, and the radial dimension of each first connecting hole is greater than or equal to the spacing between the flow hole and the outer peripheral surface of the stator punching sheet.

[0008] In this stator punching, the first connecting hole is connected to the outer circumferential surface of the stator punching. The distance between the end of the first connecting hole facing the center hole and the outer circumferential surface of the stator punching is the radial dimension of the first connecting hole. The radial dimension of the first connecting hole is greater than or equal to the distance between the flow hole and the outer circumferential surface of the stator punching. The distance between the first connecting hole and the center hole is greater than or equal to the distance between the end of the flow hole facing the center hole and the center hole. Two stator punchings are stacked axially and offset circumferentially by a certain angle, so that a first connecting hole of one stator punching can connect to the flow hole of another stator punching, thereby connecting the flow hole to the outer circumferential surface of the stator punching. When a stator core having at least two stator punchings is liquid-cooled, the cooling medium on the outer circumferential surface of the stator punching can enter the flow hole along the first connecting hole, liquid-cooling the interior of the stator core, improving cooling efficiency and thereby enhancing the heat dissipation performance of the motor.

[0009] In some possible implementations, along the circumference of the stator lamination, the circumferential dimension of the flow holes is greater than the circumferential dimension of the first connecting holes, and the distance between any two adjacent flow holes is greater than the circumferential dimension of the first connecting holes. The flow holes can accommodate more cooling medium, and the cooling medium can be evenly cooled along the circumference of the stator lamination.

[0010] In some possible implementations, one or more first communication holes are spaced apart between two adjacent flow holes along the circumference of the stator lamination. The number and distribution density of the first communication holes can affect the amount of cooling medium entering the flow holes. The position between the first communication holes and the flow holes can be adjusted as needed to evenly distribute the cooling medium.

[0011] In some possible implementations, the stator punching includes a plurality of second communicating holes, each of which extends through the stator punching in an axial direction, and the plurality of second communicating holes are spaced apart circumferentially along the stator punching. In the radial direction of the stator punching, the distance between each second communicating hole and the outer circumferential surface of the stator punching is less than or equal to the sum of the distance between the flow hole and the outer circumferential surface of the stator punching and the radial dimension of the flow hole. Two stator punchings are stacked axially, and the two stator punchings are offset by a certain angle circumferentially along the stator punchings, so that a second communicating hole of one stator punching can communicate with a flow hole of another stator punching, thereby connecting the second communicating holes to the outer circumferential surface of the stator punching.

[0012] In some possible implementations, along the circumference of the stator lamination, the circumferential dimension of the flow holes is greater than the circumferential dimension of the second connecting holes, and the distance between any two adjacent flow holes is greater than the circumferential dimension of the second connecting holes. Cooling medium contained in the flow holes can be evenly distributed along the circumference of the stator lamination and delivered to the second connecting holes.

[0013] In some possible implementations, the number of the plurality of second communication holes is smaller than the number of the plurality of grooves, wherein, along the circumferential direction of the stator punching sheet, the spacing between two adjacent grooves is smaller than the spacing between two adjacent second communication holes.

[0014] In some possible implementations, multiple grooves are connected to multiple second communication holes along the radial direction of the stator punching sheet, enabling oil flow within the grooves. Cooling fluid in the flow holes can enter the grooves through the second communication holes to cool the stator windings housed therein. Specifically, one of any two circumferentially adjacent grooves in the stator punching sheet is connected to one of the second communication holes.

[0015] In some possible implementations, each second communication hole is spaced apart between a groove and the outer circumference of the stator punching along the radial direction of the stator punching, and the spacing between the second communication hole and the center hole is greater than the radial dimension of the groove. The second communication holes are arranged on one side of the groove bottom, allowing oil to flow through the groove bottom.

[0016] In some possible implementations, each second communication hole is spaced between any two adjacent grooves along the circumference of the stator punching sheet, enabling inter-groove oil flow. The spacing between the second communication hole and the center hole can be smaller than the spacing between the bottom of the groove and the center hole.

[0017] In some possible implementations, along the circumference of the stator punching sheet, a plurality of first communicating holes and a plurality of second communicating holes are staggered and arranged, and a first communicating hole is connected to one of an adjacent second communicating hole and the flow hole.

[0018] In some possible implementations, the distance between any two adjacent flow holes along the circumference of the stator punching sheet is less than the circumferential dimension of the flow hole. Two stator punching sheets are stacked along the axial direction of the stator punching sheet, and the two stator punching sheets are offset by a certain angle along the circumference of the stator punching sheet, so that one flow hole of one stator punching sheet can be simultaneously connected to two adjacent flow holes along the circumference of the other stator punching sheet, forming a channel for the circumferential flow of the cooling medium, so that the cooling medium can flow along the circumference of the stator punching sheet.

[0019] In a second aspect, the present application provides a stator core comprising at least two stator punchings provided in the first aspect. The at least two stator punchings are arranged adjacent to each other axially along the stator core, and each flow hole in one stator punching is connected to a flow hole in another stator punching in a staggered manner along the circumference of the stator core, thereby forming a channel extending along the circumference of the stator core for the flow of a cooling medium. Each first connecting hole in one stator punching is connected to a flow hole in another stator punching, thereby directing the cooling medium at the outer circumference of the stator core to the flow holes.

[0020] In some possible implementations, the stator core includes at least one first punching, which is arranged on a side of one stator punching away from an adjacent stator punching along the axial direction of the stator core. Each first communication hole of a stator punching is connected to at least one first communication hole of an adjacent first punching along the axial direction of the stator core.

[0021] In a third aspect, the present application provides a motor comprising a housing and a stator core as provided in the second aspect and any implementation thereof, wherein the housing is sleeved over the outer circumference of the stator core. The housing includes a liquid inlet, the coolant inlet being configured to communicate with a first communication hole of at least one stator punching.

[0022] In some possible implementations, the inner wall of the housing facing the stator core includes a radial groove. In the radial direction of the stator core, the liquid inlet communicates with the radial groove, which in turn communicates with the at least one first communication hole. In the axial direction of the stator core, the radial groove has a radial dimension greater than or equal to the axial dimension of a stator lamination.

[0023] In a fourth aspect, the present application provides a powertrain comprising the motor of the third aspect and any implementation thereof. The powertrain includes a reducer or a transmission, and the motor of the third aspect and any implementation thereof, wherein the motor shaft of the motor is drivingly connected to the input shaft of the reducer or the input shaft of the transmission. Because the motor has excellent heat dissipation performance, the heat dissipation performance and power performance of the powertrain can be improved.

[0024] In a fifth aspect, the present application further provides an electric vehicle. The electric vehicle includes wheels, a transmission mechanism, and the powertrain according to the fourth aspect and any implementation thereof. The powertrain drives the wheels via the transmission mechanism. The electric vehicle provided in this application has excellent heat dissipation and power performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application;

[0026] FIG2 is a schematic structural diagram of a powertrain provided in an embodiment of the present application;

[0027] FIG3 a is a schematic structural diagram of the assembly of a stator core and a housing of a motor provided in an embodiment of the present application;

[0028] FIG3 b is a schematic structural diagram of a motor provided in an embodiment of the present application, wherein the stator core and the housing are separated;

[0029] FIG4a is a schematic structural diagram of a stator core provided in an embodiment of the present application;

[0030] FIG4 b is an exploded view of a stator core provided in an embodiment of the present application;

[0031] FIG5a is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0032] FIG5 b is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0033] Figure 5c is an enlarged view of the details at T1 in Figure 5b;

[0034] FIG6 a is a schematic diagram of the structure of two stacked stator punching sheets provided in an embodiment of the present application;

[0035] FIG6 b is an enlarged view of the details at T2 in FIG6 a ;

[0036] FIG6c is a channel model for cooling medium flow formed by the two stator punchings shown in FIG6a;

[0037] FIG7 a is a schematic diagram of the structure of two stacked stator punching sheets provided in an embodiment of the present application;

[0038] FIG7 b is an enlarged view of the details at T3 in FIG7 a ;

[0039] FIG7c is a model of a channel for cooling medium flow formed by the two stator punchings shown in FIG7a;

[0040] FIG8a is a schematic cross-sectional view of a partial structure of a stator provided in an embodiment of the present application;

[0041] FIG8b is an enlarged view of the details at T4 in FIG8a;

[0042] FIG9a is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0043] FIG9 b is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0044] FIG9c is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0045] FIG9 d is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0046] FIG9e is a schematic structural diagram of a stator punching sheet provided in an embodiment of the present application;

[0047] FIG10 is a structural diagram of the matching relationship between a stator punching sheet and a housing provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0049] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the", and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0050] When a motor runs at high speed, heat loss from the stator core is the primary source of heat. Traditionally, oil cooling has been used to dissipate heat from the motor's stator. Specifically, oil is passed through the back of the stator core and sprayed onto the end coils of the stator windings to dissipate the heat. However, this cooling method is ineffective and cannot meet the high heat dissipation requirements associated with increased motor power density. Furthermore, this cooling method imposes restrictions on motor design, reduces space utilization, and the addition of auxiliary oil spraying structures increases production costs.

[0051] Based on this, the embodiments of the present application provide a stator punching sheet, a stator core, a motor, a powertrain and an electric vehicle having multiple connecting holes. At least two stator punching sheets are stacked to guide the cooling medium on the outer peripheral surface of the stator core into the stator core, thereby improving the cooling effect of the stator core.

[0052] Figure 1 is a schematic diagram of an electric vehicle provided in accordance with an embodiment of the present application. Referring to Figure 1 , the electric vehicle provided in accordance with an embodiment of the present application includes a powertrain 1000, a transmission mechanism 2000, and wheels 3000. Powertrain 1000 drives wheels 3000 via transmission mechanism 2000. Powertrain 1000 is used to convert electrical energy into mechanical energy. Transmission mechanism 2000 is used to provide a transmission connection between powertrain 1000 and wheels 3000.

[0053] FIG2 is a schematic diagram of a powertrain provided in an embodiment of the present application. As shown in FIG2 , the powertrain 1000 provided in an embodiment of the present application includes a motor 100 and a reducer 200. The motor 100 and the reducer 200 are transmission-connected. The motor 100 is used to drive a transmission mechanism 2000 of an electric vehicle through the reducer 200. The motor 100 includes a stator core 10, a stator winding 20, a rotor 30, a motor shaft 40, and a housing 50. The rotor 30 is coaxially fixed to the motor shaft 40, and the motor shaft 40 is transmission-connected to the reducer 200. The stator core 10 is sleeved on the outside of the rotor 30, the stator winding 20 is wound on the stator core 10, and the housing 50 is arranged outside the stator core 10. The reducer 200 may also be a transmission. It should be understood that the axial direction of the stator core 10 is also the axial direction of the motor 100 , the radial direction of the stator core 10 is also the radial direction of the motor 100 , and the circumferential direction of the stator core 10 is also the circumferential direction of the motor 100 .

[0054] The motor 100 provided in the embodiment of the present application is a motor with liquid-cooled stator windings, specifically, the cooling medium used to dissipate heat for the stator 10 can simultaneously spray the cooling medium to the end windings of the stator windings 20 to dissipate heat.

[0055] Figure 3a shows a structure of a stator core 10 and a housing 50 provided in an embodiment of the present application, wherein the housing 50 is sleeved on the outer circumference of the stator core 10. Figure 3b shows a structure in which the stator core 10 and the housing 50 are separated.

[0056] 3a and 3b , the housing 50 includes a liquid inlet pipe 51, which is a hollow tube. One end of the liquid inlet pipe 51 is fixed to the outer circumferential surface of the housing 50, and the end of the liquid inlet pipe 51 facing away from the outer circumferential surface of the housing 50 forms a liquid inlet port 101. The housing 50 is used to circumferentially seal the stator core 10. The housing 50 is cylindrical, and the inner wall of the housing 50 includes a radial groove 52. The radial groove 52 is formed by a groove provided on the inner wall of the housing 50. The radial groove 52 extends along the circumference of the housing 50, and the bottom of the radial groove 52 is connected to the liquid inlet port 101 through the liquid inlet pipe 51.

[0057] 3a and 3b , the stator core 10 includes stator teeth 103, winding slots 104, and a receiving hole 105. The receiving hole 105 is located at the axial center of the stator core 10 and extends through the stator core 10 in the axial direction. There are multiple winding slots 104, which are spaced apart along the circumference of the stator core 10. Each winding slot 104 is connected to the receiving hole 105 in the radial direction of the stator core 10. Along the circumference of the stator core 10, a stator tooth 103 is formed between any two adjacent winding slots 104. The winding slots 104 are used to accommodate a portion of the stator winding 20, and the receiving hole 105 is used to accommodate the rotor 30. The outer circumferential surface of the stator core 10 includes a plurality of circumferential flow channels 106, which are connected to the axial end surface of the stator core 10. The axial end surface of the stator core 10 includes a plurality of liquid outlets 102 . The plurality of liquid outlets 102 are arranged at intervals along the circumference of the motor 100 .

[0058] When the shell 50 is sleeved on the outer circumference of the stator core 10, and when the shell 50 is sealed and sleeved on the outer circumference of the stator core 10 composed of multiple punching sheets 1, the radial groove 52 can be connected with the multiple circumferential flow channels 106 on the outer circumference of the stator core 10. Here, the radial groove 52 exemplarily surrounds the inner wall of the shell 50 to form an annular flow channel, and then all the circumferential flow channels 106 of the stator core 10 can be connected with the radial groove 52. Along the axial direction of the stator core 10, the axial length of the radial groove 52 is less than the axial length of the circumferential flow channel 106. The stator core 10 has a flow channel for the circulation of the cooling medium, which connects at least one circumferential flow channel 106 with at least one liquid outlet 102. The liquid outlet 102 is used to spray the cooling medium to dissipate heat from the end of the stator winding 20.

[0059] When the stator is liquid-cooled, a cooling medium can be injected through the liquid inlet 101, and the cooling medium flows along the radial groove 52 of the shell 50 around the circumference of the stator core 10, and enters each circumferential flow channel 106 and flows along the axial direction of the stator core 10 to the two end faces of the stator core 10. The cooling medium in the circumferential flow channel 106 can also flow to the multiple liquid outlets 102 through the flow channel in the stator core 10 and be sprayed out. When the cooling medium circulates in the stator core 10, it can dissipate heat to the stator winding 20 through the stator core 10, and the cooling medium sprayed from the liquid outlet 102 can be sprayed on the end of the stator winding 20 located at the end of the stator core 10. For example, the number and arrangement rules of the liquid outlets 102 can be adjusted according to actual cooling requirements and process conditions.

[0060] Figure 4a shows the structure of a stator core 10. The stator core 10 comprises a plurality of punchings 1. Each punching 1 includes a center hole 11, a plurality of grooves 12, a plurality of first connecting holes 13, and a plurality of second connecting holes 14. Each groove 12 is radially connected to the center hole 11 of the punching 1, and each groove 12, each first connecting hole 13, and each second connecting hole 14 extends axially through the punching 1. Along the circumference of the punching 1, the plurality of first connecting holes 13 are spaced apart, the plurality of second connecting holes 14 are spaced apart, and the plurality of grooves 12 are spaced apart. When the plurality of punchings 1 are arranged adjacent to each other in the axial direction of the stator core 10, the center holes 11 of the plurality of punchings 1 can be connected to form a receiving hole 105 of the stator core 10, and the grooves 12 of the plurality of punchings 1 can be connected to form a winding slot 104 of the stator core 10. The structure between any two circumferentially adjacent grooves 12 of the plurality of punchings 1 can be stacked to form a stator tooth 103 of the stator core 10. The first communication hole 13 of each punching plate 1 is connected to the outer circumferential surface of the punching plate 1. The first communication hole 13 can serve as part of the circumferential flow channel 106 of the stator core 10. Each punching plate 1 also includes a second communication hole 14. Along the radial direction of the punching plate 1, the second communication hole 14 is arranged between the first communication hole 13 and the center hole 11. The second communication hole 14 of the punching plate 1 arranged at the axial end of the stator core 10, the end facing the axial end surface of the stator core 10, forms the liquid outlet 102 of the stator core 10.

[0061] Continuing with reference to FIG4a , the multiple punching sheets 1 of the stator core 10 include at least two stator punching sheets 1a and at least one first punching sheet 1b. The stator punching sheet 1a is a radially connected punching sheet 1, and the at least two stator punching sheets 1a are arranged adjacent to each other in the axial direction of the stator core 10 and are offset from each other in the circumferential direction of the stator core 10. Along the axial direction of the stator core 10, at least one first punching sheet 1b is arranged on the side of one stator punching sheet 1a away from the other adjacent stator punching sheet 1a. For example, all the stator punching sheets 1a in FIG4a are arranged adjacent to each other in the axial direction of the stator core 10, at least one first punching sheet 1b is arranged on one side of all the stator punching sheets 1a, and at least one first punching sheet 1b is arranged on the other side of all the stator punching sheets 1a. It can be considered that all the stator punching sheets 1a are arranged between the two first punching sheets 1b in the circumferential direction of the stator core 10. Of course, the stator punching sheets 1a and the first punching sheets 1b can also be arranged in other ways. The axial end of the stator core 10 is the first punching sheet 1b. It can be considered that the surface of the first punching sheet 1b facing away from the stator punching sheet 1a is at least a part of the axial end face of the stator core 10. The second connecting hole 14 of the first punching sheet 1b is away from the port of the stator punching sheet 1a to form the liquid outlet 102 of the stator core 10.

[0062] Based on Figure 4a, combined with the exploded view of the stator core 10 shown in Figure 4b. As shown in Figure 4b, there are three stator punchings 1a, and the three stator punchings 1a are arranged adjacent to each other along the axial direction of the stator core 10. Each stator punching 1a also includes a plurality of flow holes 15, and the plurality of flow holes 15 are distributed at intervals along the circumference of the stator punching 1a. Each flow hole 15 penetrates the stator punching 1a in the axial direction of the stator punching 1a, and each flow hole 15 is arranged between the outer peripheral surface of the stator punching 1a and the center hole 11 in the radial direction of the stator punching 1a.

[0063] Continuing with reference to FIG4b , there are illustratively two first punching sheets 1b, and the two first punching sheets 1b are arranged on both sides of the three stator punching sheets 1a along the axial direction of the stator core 10. The first connecting hole 13 of each first punching sheet 1b is connected to the outer peripheral surface of the first punching sheet 1b. The first connecting hole 13 is illustratively a groove formed on the outer peripheral surface of the first punching sheet 1b. The first connecting hole 13 extends along the axial direction of the first punching sheet 1b and is connected to the axial end face of the first punching sheet 1b. It should be understood that in FIG4b , the first punching sheet 1b has a larger size along the axial direction of the stator core 10. It can also be considered that the first punching sheet 1b is composed of multiple punching sheets with smaller thickness stacked along the axial direction of the stator core 10.

[0064] Figure 5a shows the structure of a stator punching sheet 1a. As shown in Figure 5a, the stator punching sheet 1a includes a central hole 11, a plurality of grooves 12, a plurality of first communicating holes 13, a plurality of second communicating holes 14, and a plurality of circulation holes 15. The central hole 11, each groove 12, each first communicating hole 13, each second communicating hole 14, and each circulation hole 15 penetrate the stator punching sheet 1a in the axial direction.

[0065] Exemplarily, the center hole 11 is located at the center of the stator punching 1a, and a plurality of grooves 12 are spaced apart along the circumference of the stator punching 1a, and each groove 12 is connected to the center hole 11 in the radial direction of the stator punching 1a. A plurality of first connecting holes 13 are spaced apart along the circumference of the stator punching 1a, and each first connecting hole 13 is connected to the outer peripheral surface of the stator punching 1a in the radial direction of the stator punching 1a. A plurality of second connecting holes 14 are spaced apart along the circumference of the stator punching 1a. Along the circumference of the stator punching 1a, a flow hole 15 is arranged between any two first connecting holes 13, and the plurality of flow holes 15 are spaced apart along the circumference of the stator punching 1a. Along the radial direction of the stator punching 1a, the first connecting holes 13 and the second connecting holes 14 are spaced apart.

[0066] The number of the plurality of second communication holes 14 can be less than the number of the plurality of grooves 12. Specifically, along the circumference of the stator punching sheet 1a, the spacing between two adjacent grooves 12 can be less than the number of two adjacent second communication holes 14. Exemplarily, the number of grooves 12 is twice the number of the first communication holes 13, twice the number of the second communication holes 14, and twice the number of the flow holes 15. Exemplarily, both the first communication holes 13 and the second communication holes 14 are spaced apart and arranged between two adjacent flow holes 15 along the circumference of the stator punching sheet 1a.

[0067] Figure 5b shows an axial view of the stator sheet 1a, and Figure 5c shows an enlarged detail view of point T1 in Figure 5b. As shown in both Figures 5b and 5c, along the radial direction of the stator sheet 1a, the distance h31 between each first connecting hole 13 and the center hole 11 is greater than the distance h51 between each flow hole 15 and the center hole 11. The radial dimension h32 of each first connecting hole 13 is greater than or equal to the distance h52 between the flow hole 15 and the outer circumference of the stator sheet 1a. Furthermore, the distance between the first connecting hole 13 and the center hole 11 is greater than or equal to the distance h51 between the end of the flow hole 15 facing the center hole 11 and the center hole 11. The stator sheet 1a is annular in shape, with the center hole 11 located at the center of the stator sheet 1a. The center of the center hole 11 coincides with the center O of the stator sheet 1a. With reference to the center O of the stator sheet 1a, the distance H31 between each first connecting hole 13 and the center O is greater than the distance H51 between each flow hole 15 and the center O. Each second communication hole 14 is spaced apart between two circumferentially adjacent grooves 12. The spacing h42 between the second communication hole 14 and the center hole 11 is less than or equal to the spacing h21 between the bottom of the groove 12 and the center hole 11. When a cooling medium flows through the second communication hole 14, the cooling medium can cool the teeth between the grooves 12. The teeth refer to the structure between two circumferentially adjacent grooves 12.

[0068] It should be understood that when the first communicating hole 13 , the second communicating hole 14 , and the flow hole 15 are irregular in shape, the distance between the structures may be the distance at the closest point.

[0069] Continuing with Figure 5c, along the circumference of the stator sheet 1a, each first communication hole 13 is illustratively arranged between two adjacent circulation holes 15. Taking the circumference of the stator sheet 1a with the same radial distance from the center hole 11 as an example, the circumferential dimension w51 of the circulation hole 15 is greater than the circumferential dimension w31 of the first communication hole 13, and the spacing w52 between any two adjacent circulation holes 15 is greater than the circumferential dimension w31 of the first communication hole 13. The circumferential dimension w51 of the circulation hole 15 is greater than the spacing w52 between any two adjacent circulation holes 15.

[0070] The two or more stator punching sheets 1a are stacked along the axial direction of the stator punching sheet 1a, and any two adjacent stator punching sheets 1a are offset by a certain angle along the circumferential direction of the stator punching sheet 1a, so that a first communication hole 13 of one stator punching sheet 1a can be connected to a flow hole 15 of another stator punching sheet 1a, and the flow hole 15 can be connected to the outer circumferential surface of the stator punching sheet 1a, so that the cooling medium can enter the stator core 10. Among them, one flow hole 15 can accommodate more cooling medium, and after the cooling medium enters the flow hole 15 through the first communication hole 13, it can flow along the circumference of the stator punching sheet 1a, thereby evenly cooling the medium.

[0071] Continuing with Figures 5b and 5c, along the radial direction of the stator sheet 1a, the spacing h41 between each second communication hole 14 and the outer circumferential surface of the stator sheet 1a is less than or equal to the sum of the spacing h52 between the flow hole 15 and the outer circumferential surface of the stator sheet 1a and the radial dimension h53 of the flow hole 15. Along the circumferential direction of the stator sheet 1a, the circumferential dimension w51 of the flow hole 15 is greater than the circumferential dimension w41 of the second communication hole 14, and the spacing w52 between any two adjacent flow holes 15 is greater than the circumferential dimension w41 of the second communication hole 14.

[0072] The above-mentioned two or more stator punching sheets 1a are stacked along the axial direction of the stator punching sheet 1a, and any two adjacent stator punching sheets 1a are offset by a certain angle along the circumferential direction of the stator punching sheet 1a, so that a second connecting hole 14 of one stator punching sheet 1a can be connected to a flow hole 15 of another stator punching sheet 1a, and the second connecting hole 14 can be connected to a first connecting hole 13 through the flow hole 15. The first connecting hole 13 is connected to the outer peripheral surface of the stator punching sheet 1a and can be used to form an outer cooling channel of the stator core 10. The second connecting hole 14 is closer to the center hole 11 than the first connecting hole 13, and can form a part of the inner cooling channel of the stator core 10, thereby providing liquid cooling and heat dissipation for the inner structure of the stator core 10. When liquid cooling is performed on the stator core 10 having at least two stator punching sheets 1a, the cooling medium at the outer peripheral surface of the stator punching sheet 1a can enter the second connecting hole 14 along the first connecting hole 13 and the flow hole 15, thereby realizing double-layer cooling of the outer cooling channel and the inner cooling channel of the stator core 10.

[0073] It should be understood that in some embodiments, the stator punching sheet 1 a may not have the second communicating hole 14 , and the structure of the first communicating hole 13 and the flow hole 15 can also achieve the effect of guiding the cooling medium into the stator core 10 .

[0074] Figure 6a shows a structure in which two stator punching sheets 1a are arranged adjacent to each other along the axial direction of the stator core 10. As shown in Figure 6a, along the axial direction of the stator punching sheet 1a, the center holes 11 of the two stator punching sheets 1a are connected, and the multiple grooves 12 are also connected. When observing the two stator punching sheets 1a along the axial direction of the stator punching sheet 1a, the center holes 11 of the two stator punching sheets 1a overlap, and the multiple grooves 12 of the two stator punching sheets 1a overlap. Along the circumferential direction of the stator punching sheet 1a, the two stator punching sheets 1a are arranged at a certain angle that is offset from each other. The multiple grooves 12 of the stator punching sheet 1a are evenly arranged along the circumferential direction of the stator punching sheet 1a, and the angle between any two adjacent grooves 12 is equal. The angle at which the two stator punching sheets 1a are offset from each other is an integer multiple of the angle between any two adjacent grooves 12.

[0075] Further reference is made to the enlarged detail view at T2 in FIG6a shown in FIG6b. As shown in FIG6b, the two stator punching sheets 1a are respectively exemplified as stator punching sheet 1a-1 and stator punching sheet 1a-2, and the two are staggered along the circumference of the stator punching sheet 1a. Among them, each flow hole 15 of the stator punching sheet 1a-1 is simultaneously connected to the two circumferentially adjacent flow holes 15 of the stator punching sheet 1a-2, and each flow hole 15 of the stator punching sheet 1a-2 is simultaneously connected to the two circumferentially adjacent flow holes 15 of the stator punching sheet 1a-1. The multiple flow holes 15 of the stator punching sheet 1a-1 can be sequentially connected with the multiple flow holes 15 of the stator punching sheet 1a-2 along the circumference of the stator punching sheet 1a to form a circumferential flow channel. Each first communication hole 13 of the stator punching 1a-1 can be connected to a flow hole 15 of the stator punching 1a-2, and each first communication hole 13 of the stator punching 1a-2 can be connected to a flow hole 15 of the stator punching 1a-1, so that each first communication hole 13 can be connected to the circumferential flow channel. Each second communication hole 14 of the stator punching 1a-1 can be connected to a flow hole 15 of the stator punching 1a-2, and each second communication hole 14 of the stator punching 1a-2 can be connected to a flow hole 15 of the stator punching 1a-1, so that each second communication hole 14 can be connected to the circumferential flow channel.

[0076] Figure 6c shows a model of the channels for cooling medium circulation formed by the two stator punchings 1a shown in Figure 6a. As shown in Figure 6c, each first connecting hole 13 of stator punching 1a-1 forms a channel m31, each second connecting hole 14 forms a channel m41, and each circulation hole 15 forms a channel m51. Each first connecting hole 13 of stator punching 1a-2 forms a channel m32, each second connecting hole 14 forms a channel m42, and each circulation hole 15 forms a channel m52. Along the circumference of stator punching 1a, the multiple channels m51 of stator punching 1a-1 and the multiple channels m52 of stator punching 1a-2 are alternately connected in sequence, that is, each channel m51 is connected between two adjacent channels m52, and each channel m52 is connected between two adjacent channels m51, thereby forming an annular channel. Each channel m31 of the stator sheet 1a-1 is connected to a channel m52 of the stator sheet 1a-2, and each channel m41 of the stator sheet 1a-1 is connected to a channel m52 of the stator sheet 1a-2. Each channel m32 of the stator sheet 1a-2 is connected to a channel m51 of the stator sheet 1a-1, and each channel m42 of the stator sheet 1a-2 is connected to a channel m51 of the stator sheet 1a-1.

[0077] Figure 7a shows a structure in which three stator punching sheets 1a are arranged adjacent to each other in the axial direction of the stator core 10, and Figure 7b is a detailed enlarged view of T3 in Figure 7a. The three stator punching sheets 1a are respectively exemplified as stator punching sheet 1a-1, stator punching sheet 1a-2 and stator punching sheet 1a-3. For example, stator punching sheet 1a-1 and stator punching sheet 1a-3 are opposite to each other in the axial direction of the stator punching sheet 1a. Specifically, along the axial direction of the stator punching sheet 1a, a first connecting hole 13 of the stator punching sheet 1a-1 corresponds to a first connecting hole 13 of the stator punching sheet 1a-3, a second connecting hole 14 of the stator punching sheet 1a-1 corresponds to a second connecting hole 14 of the stator punching sheet 1a-3, and a flow hole 15 of the stator punching sheet 1a-1 corresponds to a flow hole 15 of the stator punching sheet 1a-3. Between any two adjacent stator punchings 1a, each flow hole 15 of one stator punching 1a is simultaneously connected to two circumferentially adjacent flow holes 15 of the other stator punching 1a, and each flow hole 15 of the other stator punching 1a is simultaneously connected to two circumferentially adjacent flow holes 15 of one stator punching 1a. The multiple flow holes 15 of one stator punching 1a can be sequentially connected with the multiple flow holes 15 of another stator punching along the circumference of the stator punching 1a to form a circumferential flow channel. Each first connecting hole 13 of one stator punching 1a can be connected to one flow hole 15 of another stator punching 1a, and each first connecting hole 13 of another stator punching 1a can be connected to one flow hole 15 of one stator punching 1a, so each first connecting hole 13 can be connected to the circumferential flow channel. Each second connecting hole 14 of a stator punching sheet 1a can be connected to a flow hole 15 of another stator punching sheet 1a, and each second connecting hole 14 of another stator punching sheet 1a can be connected to a flow hole 15 of a stator punching sheet 1a, so each second connecting hole 14 can be connected to the circumferential flow channel.

[0078] Figure 7c shows a model of the channels for cooling medium circulation formed by the three stator punchings 1a shown in Figure 7a. As shown in Figure 7c, each first connecting hole 13 of stator punching 1a-1 forms a channel m31, each second connecting hole 14 forms a channel m41, and each circulation hole 15 forms a channel m51. Each first connecting hole 13 of stator punching 1a-2 forms a channel m32, each second connecting hole 14 forms a channel m42, and each circulation hole 15 forms a channel m52. Each first connecting hole 13 of stator punching 1a-3 forms a channel m33, each second connecting hole 14 forms a channel m43, and each circulation hole 15 forms a channel m53. Along the circumference of the stator sheet 1a, the multiple channels m51 of the stator sheet 1a-1 are alternately connected to the multiple channels m52 of the stator sheet 1a-2, and the multiple channels m53 of the stator sheet 1a-3 are alternately connected to the multiple channels m52 of the stator sheet 1a-2. Each channel m52 is connected between two adjacent channels m51 and between two adjacent channels m53, thereby forming an annular circulation channel. Each channel m31 of the stator sheet 1a-1 is connected to a channel m52 of the stator sheet 1a-2, and each channel m41 of the stator sheet 1a-1 is connected to a channel m52 of the stator sheet 1a-2. Each channel m33 of the stator sheet 1a-3 is connected to a channel m52 of the stator sheet 1a-2, and each channel m43 of the stator sheet 1a-3 is connected to a channel m52 of the stator sheet 1a-2. Each channel m32 of the stator punching sheet 1a-2 is connected to a channel m51 of the stator punching sheet 1a-1 and a channel m53 of the stator punching sheet 1a-3, and each channel m42 of the stator punching sheet 1a-2 is connected to a channel m51 of the stator punching sheet 1a-1 and a channel m53 of the stator punching sheet 1a-3.

[0079] It should be understood that in the partial structures of the stator core 10 shown in Figures 6a to 6c and Figures 7a to 7c, the flow holes 15 of two adjacent stator punchings 1a can be circumferentially staggered and connected in sequence to form an annular channel. In some embodiments, the flow holes 15 of two adjacent stator punchings 1a can be partially circumferentially staggered and connected to form an arcuate channel. The channel extends along the circumference of the stator punching 1a but is not sequentially connected to form an annular channel. The arcuate channel can also allow the cooling medium to flow along the circumference of the stator punching 1a, thereby improving the circumferential distribution uniformity of the cooling medium.

[0080] Figure 8a is a schematic diagram of a partial cross-sectional structure of a stator core 10 and a housing 50, as improved in the present embodiment. As shown in Figure 8a, along the radial direction of the stator core 10, the radial groove 52 of the housing 50 corresponds to the position of the three stator punchings 1a of the stator core 10. Along the axial direction of the stator core 10, the axial length of the radial groove 52 is greater than or equal to the axial dimension of one stator punching 1a. For example, the axial length of the radial groove 52 here is greater than the axial dimension of three stator punchings 1a.

[0081] Figure 8b is an enlarged view of a detail at point T4 in Figure 8a. As shown in Figure 8b, three stator laminations 1a are arranged adjacent to each other along the axial direction of the stator core 10. A first lamination 1b is arranged on either side of each of the three stator laminations 1a. The cross-section passes through a flow hole 15 in the center stator lamination 1a. The radial groove 52 of the housing 50 communicates with the circumferential flow channel 106 of the stator core 10. The first communication hole 13b of the first lamination 1b and the first communication hole 13a of the stator lamination 1a are each part of the circumferential flow channel 106. Exemplarily, the radial groove 52 surrounds the outer circumference of the stator core 10. Its radial projection onto the outer circumference of the stator core 10 covers, for example, the three stator laminations 1a and a portion of the two first laminations 1b. Thus, the radial groove 52 communicates with each first communication hole 13a of each stator lamination 1a and each first communication hole 13b of each first lamination 1b.

[0082] In the stator core 10, at least one first communicating hole 13b of a first punching sheet 1b communicates with at least one first communicating hole 13a of an adjacent stator punching sheet 1a, and each second communicating hole 14b of a first punching sheet 1b communicates with one second communicating hole 14a of an adjacent stator punching sheet 1a. The first communicating holes 13b of a first punching sheet 1b extend axially along the stator core 10 and communicate with an axial end surface of the stator core 10, while the second communicating holes 14b of a first punching sheet 1b extend axially along the stator core 10 and communicate with an axial end surface of the stator core 10. Among the three stator punchings 1a, along the axial direction of the stator core 10, a flow hole 15 of the middle stator punching 1a is connected to a first connecting hole 13a and a second connecting hole 14a of the stator punching 1a on the left, and the flow hole 15 of the middle stator punching 1a is connected to a first connecting hole 13a and a second connecting hole 14a of the stator punching 1a on the right, thereby connecting the first connecting hole 13 and the second connecting hole 14 along the radial direction of the stator core 10.

[0083] Continuing with reference to FIG8b , the cooling medium can enter the housing 50 through the liquid inlet 101 and enter the radial groove 52 of the housing 50, and flow along the circumference of the stator core 10 as indicated by the dotted arc arrow in the figure through the radial groove 52, thereby entering each first connecting hole 13a of each stator punching 1a and each first connecting hole 13b of the two first punchings 1b. Part of the cooling medium can flow along the axial direction of the stator core 10 through the first connecting hole 13b of the first punching 1b to the axial end face of the stator core 10 and be ejected. The first connecting hole 13b and the first connecting hole 13a are located between the inner wall of the housing 50 and the outer peripheral surface of the stator core 10, and can dissipate liquid heat for the stator core 10 at the outer peripheral surface of the stator core 10. Part of the cooling medium can flow along the radial direction of the stator core 10 through the first communicating hole 13a and the flow hole 15 of the stator punching 1a to the second communicating hole 14a, and then flow through the second communicating hole 14a of the stator punching 1a to the second communicating hole 14b of the first punching 1b, and finally flow through the second communicating hole 14b to the axial end surface of the stator core 10 and be ejected. The second communicating hole 14a and the second communicating hole 14b of the stator core 10 are located near the winding slots 104 of the stator core 10, and can liquid-cool the stator core 10 on the inner side of the stator core 10. The cooling medium ejected from the axial end surface of the stator core 10 can liquid-cool the end winding.

[0084] Based on the above structure, the heat dissipation channel including the first communication holes 13b and the first communication holes 13a can be considered as the outer heat dissipation channel of the stator core 10, and the heat dissipation channel including the second communication holes 14a and the second communication holes 14b can be considered as the inner heat dissipation channel of the stator core 10. The outer heat dissipation channel and the inner heat dissipation channel can be connected by rotating and superimposing at least two stator punchings 1a.

[0085] The structure of the stator punching sheet 1 a provided in the embodiment of the present application may be implemented in a variety of ways. The stator punching sheet 1 a will be exemplarily introduced below through specific embodiments.

[0086] Figure 9a illustrates a stator punching 1a. The difference from the stator punching 1a shown in Figure 5a is that the second connecting hole 14 and the groove 12 of the stator punching 1a shown in Figure 9a are spaced apart in the radial direction of the stator punching 1a. Specifically, along the radial direction of the stator punching 1a, the spacing between the second connecting hole 14 and the center hole 11 is greater than the radial dimension of the groove 12, and the spacing H41 between the second connecting hole 14 and the center O is greater than the spacing H21 between the bottom of the groove 12 and the center O. In this structure, the cooling medium flowing through the second connecting hole 14 can pass through the bottom of the groove 12 and cool the winding contained in the groove 12 through the stator punching 1a.

[0087] Figure 9b illustrates a stator punching sheet 1a, which differs from the stator punching sheet 1a shown in Figure 9a in that each second connecting hole 14 of the stator punching sheet 1a shown in Figure 9b is connected to a groove 12 along the radial direction of the stator punching sheet 1a. For example, along the circumference of the stator punching sheet 1a, the circumferential dimension of the second connecting hole 14 is smaller than the circumferential dimension of the groove bottom of the groove 12. For example, one of any two circumferentially adjacent grooves 12 of the stator punching sheet 1a is used to connect a second connecting hole 14. The stator core 10 having the stator punching sheet 1a can realize the in-slot channel of the stator core 10, and the cooling medium in the second connecting hole 14 can directly enter the groove 12 to dissipate liquid cooling of the winding accommodated in the groove 12. In this case, the first punching sheet 1b can omit the structure of the second connecting hole 14.

[0088] The stator punching sheet 1a shown in Figure 9c is different from the stator punching sheet 1a shown in Figure 9b in that the multiple first connecting holes 13 of the stator punching sheet 1a shown in Figure 9c are offset relative to the multiple second connecting holes 14 along the circumferential direction of the stator punching sheet 1a, and each first connecting hole 13 is connected to a flow hole 15 along the radial direction of the stator punching sheet 1a.

[0089] The stator punching sheet 1a illustrated in Figure 9d is different from the stator punching sheet 1a shown in Figure 9a in that the multiple first connecting holes 13 of the stator punching sheet 1a shown in Figure 9d are offset relative to the multiple second connecting holes 14 along the circumferential direction of the stator punching sheet 1a, and each first connecting hole 13 is connected to a flow hole 15 along the radial direction of the stator punching sheet 1a.

[0090] The stator punching sheet 1a illustrated in Figure 9e is different from the stator punching sheet 1a shown in Figures 9a and 9b in that each second connecting hole 14 of the stator punching sheet 1a shown in Figure 9d is respectively connected to a flow hole 15 and a groove 12 along the radial direction of the stator punching sheet 1a.

[0091] After two or more circumferentially offset stator laminations 1a provided in the above embodiment are stacked, the flow holes 15 of adjacent stator laminations 1a can be offset and connected along the circumference of the stator core 10, forming a channel extending along the circumference of the stator core 10 within the stator core 10 for circumferential flow of the cooling medium. The channel formed by the multiple flow holes 15 can also connect the first connecting hole 13 and the second connecting hole 14, thereby connecting the outer cooling channel and the inner cooling channel of the stator core 10.

[0092] For a stator core 10 having multiple stator punchings 1a, the first connecting holes 13 of the stator punchings 1a are channels for the cooling medium to enter the circulation holes 15. The number and distribution density of the first connecting holes 13 can affect the amount of liquid that the cooling medium enters the circulation holes 15 and the second connecting holes 14, thereby affecting the cooling effect. Combined with the structural diagram of the above-mentioned shell 50 and the stator core 10, the stator 100 has a single liquid inlet 101. The flow rate of the cooling medium when entering the shell 50 through the liquid inlet 101 is relatively large, and the flow rate entering the first connecting hole 13 corresponding to the position of the liquid inlet 101 is relatively large, while the flow rate of the cooling medium transported through the radial groove 52 of the shell 50 to the first connecting hole 13 of the stator punching 1a away from the liquid inlet 101 will be reduced, and there is a time difference between the cooling medium entering different first connecting holes 13, which leads to the problem of uneven distribution of the flow rate of the cooling medium entering the stator core 10 through different first connecting holes 13. Therefore, the distribution density of the first communication holes 13 and the flow holes 15 can be adjusted so that along the circumference of the stator punching 1a, one or more first communication holes 13 are spaced apart between two adjacent flow holes 15. The number of first communication holes 13 between two circumferentially adjacent flow holes 15 can be adjusted according to the specific structure of the stator 100 and the distribution of the liquid inlets.

[0093] For example, as shown in FIG10 , when the stator 100 has only one liquid inlet 101 located at a certain circumferential angle of the stator sheet 1a, the positional distribution of the first communicating holes 13 of the stator sheet 1a can be adjusted so that the first communicating holes 13 near the liquid inlet 101 are more sparsely distributed, while the first communicating holes 13 away from the liquid inlet 101 are more densely distributed. Here, an example is given in which, within the range near the liquid inlet 101, the angle between two adjacent first communicating holes 13 is β1, and three flow holes 15 are distributed between the two first communicating holes 13. Within the range opposite the liquid inlet 101 along the radial direction of the stator sheet 1a, the angle between two adjacent first communicating holes 13 is β3, and one flow hole 15 is distributed between the two first communicating holes 13. The angle between two adjacent first communicating holes 13 located between the first two portions is β2, and two flow holes 15 are distributed between the two first communicating holes 13, with β1>β2>β3. Of course, the distribution between the first communication holes 13 and the flow holes 15 shown in FIG. 10 is only an example.

[0094] In summary, the stator core 10 provided in the embodiment of the present application, when including at least two adjacently arranged stator punchings 1a, can guide the cooling medium on the outer peripheral surface of the stator core 10 into the stator core 10 by deflecting the adjacent stator punchings 1a, and the flow holes 15 of the two adjacent stator punchings 1a can also form a channel for the circumferential flow of the cooling medium after being connected by circumferential dislocation. When the stator punching 1a also includes a second connecting hole 14 located in the inner layer, the outer layer cooling channel and the inner layer cooling channel can be connected, and the cooling medium can be guided to the end winding in conjunction with the first punching 1b, thereby improving the heat dissipation effect of the end winding 201. For the entire motor 100, no other end oil spraying structure is required for spraying the coolant to the end winding, which can simplify the structure and manufacturing process of the motor 100. Along the axial direction of the motor 100, the size of the motor 100 can be made smaller, which is conducive to achieving the volume of the motor 100. When the motor 100 is applied to a powertrain 1000 and an electric vehicle, it can occupy a smaller space and obtain a greater space benefit.

[0095] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A stator punching sheet having a plurality of communicating holes, characterized in that The stator punching sheet includes a central hole, a plurality of grooves, a plurality of first communication holes, and a plurality of circulation holes. Each of the grooves communicates with the central hole along the radial direction of the stator punching sheet. Each of the first communication holes, each of the circulation holes, and each of the grooves penetrate the stator punching sheet along the axial direction of the stator punching sheet. Wherein: Along the circumferential direction of the stator punching sheet, the plurality of first communication holes are arranged at intervals, the plurality of circulation holes are arranged at intervals, and the plurality of grooves are arranged at intervals; Along the radial direction of the stator punching sheet, the distance between each first communication hole and the central hole is greater than the distance between each circulation hole and the central hole. Each first communication hole communicates with the outer peripheral surface of the stator punching sheet, and the radial dimension of each first communication hole is greater than or equal to the distance between the circulation hole and the outer peripheral surface of the stator punching sheet.

2. The stator punching sheet according to claim 1, characterized in that, Along the circumferential direction of the stator punching sheet, the circumferential dimension of the circulation hole is greater than the circumferential dimension of the first communication hole, and the distance between any two adjacent circulation holes is greater than the circumferential dimension of the first communication hole.

3. The stator punching sheet according to claim 1 or 2, characterized in that, Along the circumferential direction of the stator punching sheet, one or more of the first communication holes are arranged at intervals between two adjacent circulation holes.

4. The stator punching sheet according to any one of claims 1-3, characterized in that The stator punching sheet includes a plurality of second communication holes. Each of the second communication holes penetrates the stator punching sheet along the axial direction of the stator punching sheet. The plurality of second communication holes are arranged at intervals along the circumferential direction of the stator punching sheet; Along the radial direction of the stator punching sheet, the distance between each second communication hole and the outer peripheral surface of the stator punching sheet is less than or equal to the sum of the distance between the circulation hole and the outer peripheral surface of the stator punching sheet and the radial dimension of the circulation hole.

5. The stator punching sheet according to claim 4, wherein Along the circumferential direction of the stator punching sheet, the circumferential dimension of the circulation hole is greater than the circumferential dimension of the second communication hole, and the distance between any two adjacent circulation holes is greater than the circumferential dimension of the second communication hole.

6. The stator punching sheet according to claim 4 or 5, characterized in that, The number of the plurality of second communication holes is less than the number of the plurality of grooves, wherein: Along the circumferential direction of the stator punching sheet, the distance between two adjacent grooves is less than the distance between two adjacent second communication holes.

7. The stator punching sheet according to claim 6, characterized in that, The plurality of grooves are respectively communicated with the plurality of second communication holes along the radial direction of the stator punching sheet.

8. The stator punching sheet according to claim 7, characterized in that, One of any two adjacent grooves along the circumferential direction of the stator punching sheet is used to communicate with one second communication hole.

9. The stator punching sheet according to claim 6, wherein Along the radial direction of the stator punching sheet, each second communication hole is arranged at intervals between a groove and the outer peripheral surface of the stator punching sheet, and the distance between the second communication hole and the central hole is greater than the radial dimension of the groove.

10. The stator punching sheet according to claim 6, characterized in that, Along the circumferential direction of the stator punching sheet, each second communication hole is arranged at intervals between any two adjacent grooves along the circumferential direction of the stator punching sheet.

11. The stator punching sheet according to any one of claims 4-10, characterized in that, Along the circumferential direction of the stator punching sheet, the plurality of first communication holes and the plurality of second communication holes are arranged in a staggered manner, and one of the first communication holes and one of the adjacent second communication holes are communicated with the circulation hole.

12. The stator punching sheet according to any one of claims 1-11, characterized in that, Along the circumferential direction of the stator punching sheet, the distance between any two adjacent circulation holes is less than the circumferential dimension of the circulation hole.

13. A stator core, characterized in that, The stator core includes at least two stator punching sheets according to any one of claims 1-12; At least two of the stator laminations are arranged adjacent to each other along the axial direction of the stator core, and each of the circulation holes of one stator lamination is misaligned and communicated with one of the circulation holes of another stator lamination along the circumferential direction of the stator core, and each of the first communication holes of one stator lamination is communicated with one of the circulation holes of another stator lamination.

14. The stator core according to claim 13, wherein, The stator core includes at least one first lamination, and along the axial direction of the stator core, at least one of the first laminations is arranged on one side of one of the stator laminations away from another adjacent stator lamination; Along the axial direction of the stator core, each of the first communication holes of the stator lamination is communicated with at least one of the first communication holes of the adjacent first lamination.

15. A motor, characterized in that, The motor includes a housing and the stator core as claimed in claim 13 or 14; The housing is sleeved on the outer peripheral surface of the stator core, and the housing includes a liquid inlet for communicating with the first communication hole of the stator lamination.

16. The motor according to claim 15, characterized in that, The housing includes a liquid inlet, and the inner wall of the housing facing the stator core includes a radial groove; Along the radial direction of the stator core, the liquid inlet is communicated with the radial groove, and the radial groove is communicated with at least one of the first communication holes; Along the axial direction of the stator core, the radial dimension of the radial groove is greater than or equal to the axial dimension of one stator lamination.

17. A powertrain, characterized in that, It includes a reducer or a transmission and the motor as claimed in claim 15 or 16, and the motor shaft of the motor is in transmission connection with the input shaft of the reducer or the input shaft of the transmission.

18. An electric vehicle, characterized in that, It includes a wheel, a transmission mechanism and the power assembly as claimed in claim 17, and the power assembly drives the wheel through the transmission mechanism.

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