Stator core, Stator assembly, Electric machine, Powertrain, Vehicle

Abstract

The embodiment of the application provides a kind of stator core, stator assembly, motor, power assembly and vehicle.The stator core is provided with sequentially communicated oil inlet flow channel, first cooling oil channel and oil outlet flow channel, oil inlet flow channel is arranged at the axial first end of the stator core, oil outlet flow channel is arranged at the axial second end of the stator core, and first cooling oil channel is arranged at the side of the stator core.In the scheme, the two axial ends and the side of the stator core can be in contact with the cooling oil for heat conduction, and the heat generated can be carried away by the flowing cooling oil in time, greatly increasing the heat dissipation area of the stator core, so as to ensure that the stator core can have higher heat dissipation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, and in particular to a stator core, a stator assembly, an electric machine, a power assembly, and a vehicle. BACKGROUND

[0002] With the increasing requirement of power performance of electric vehicles, the torque density and power density of the power assembly, as one of the core components of the electric vehicles, also increase to realize the lightweight and miniaturization of the electric machine. The electric machine, as the core component of the power assembly, is the key to the power output of the power assembly, and directly determines the power output of the power assembly and the power performance of the vehicle. The torque density and power density of the electric machine also increase, and the heat dissipation of the electric machine becomes a major problem.

[0003] The heat dissipation capacity of the electric machine is improved, which is an important scheme to improve the torque density and power density of the electric machine. Therefore, how to further improve the heat dissipation capacity of the electric machine is the direction and research focus of the technical personnel in the field. SUMMARY

[0004] The embodiments of the present application provide a stator core, a stator assembly, an electric machine, a power assembly, and a vehicle, which are beneficial to improve the heat dissipation efficiency of the electric machine, increase the torque density and power density of the power assembly, realize the lightweight and miniaturization of the electric machine, and further facilitate the lightweight and miniaturization of the vehicle.

[0005] The embodiments of the present application provide a stator assembly, comprising: a stator core and a stator coil, the stator coil is fixed to the stator core, the stator core is provided with an oil inlet flow channel, a first cooling oil channel and an oil outlet flow channel which are sequentially communicated, the oil inlet flow channel is arranged at an axial first end portion of the stator core, the oil outlet flow channel is arranged at an axial second end portion of the stator core, and the first cooling oil channel is arranged at a side portion of the stator core.

[0006] The stator core comprises a core body and a stator sleeve, the stator sleeve is sleeved outside the core body, and the stator sleeve is provided with the first cooling oil channel;

[0007] The stator core further comprises a stator slot wedge, the stator slot wedge is provided with a second cooling oil channel extending along the axial direction of the stator core;

[0008] The axial first end portion of the stator core is provided with a second oil inlet hole, the second oil inlet hole is arranged corresponding to the radial middle portion of the stator tooth of the stator core, and the second oil inlet hole is communicated with the oil inlet flow channel; the second oil inlet hole is opposite to the middle position of the end winding of the stator coil on one side, the end winding on one side is immersed in the cooling oil, and the cooling oil flowing through the middle position of the end winding on one side enters the second oil inlet hole to cool the inside of the end winding on one side;

[0009] The axial second end of the stator core is provided with a second oil outlet hole corresponding to the radial middle part of the stator tooth of the stator core, and the second oil outlet hole is communicated with the oil outlet flow channel; the second oil outlet hole is opposite to the middle position of the end winding of the side stator coil, the end winding is immersed in the cooling oil, and the cooling oil flowing out of the second cooling oil channel can flow to the second oil outlet hole through the oil outlet flow channel, thereby cooling the inside of the end winding.

[0010] The stator core provided by the embodiment of the present application can be cooled by the cooling oil entering the cooling cavity through the oil inlet, the cooling oil entering the first cooling oil channel through the oil inlet flow channel, the cooling oil entering the oil outlet flow channel through the first cooling oil channel, and the cooling oil flowing out through the oil outlet. Thus, the two axial ends and the side of the stator core can be in contact with the cooling oil for heat conduction, and the generated heat can be carried away by the flowing cooling oil, thereby greatly increasing the heat dissipation area of the stator core, ensuring that the stator core has high heat dissipation efficiency, and improving the heat dissipation of the motor using the stator core, the torque density and power density of the power assembly, so as to realize the lightweight and miniaturization of the motor, thereby facilitating the lightweight and miniaturization of the vehicle.

[0011] In an exemplary embodiment, the oil inlet flow channel extends in the radial direction of the stator core, and the radial outer end of the oil inlet flow channel is communicated with the first cooling oil channel; and / or the oil outlet flow channel extends in the radial direction of the stator core, and the radial outer end of the oil outlet flow channel is communicated with the first cooling oil channel.

[0012] In an exemplary embodiment, the first cooling oil channel has any one or a combination of the following forms: the first cooling oil channel extends in the circumferential and axial directions of the stator core in a spiral shape; or the first cooling oil channel extends in the axial direction of the stator core in a straight line shape; or the first cooling oil channel includes a plurality of annular oil channels extending in the circumferential direction of the stator core and a gap oil channel located between and communicated with two adjacent annular oil channels; or the first cooling oil channel has a mesh shape.

[0013] In an exemplary embodiment, the oil inlet channel is located inside the stator core, and an axial first end of the stator core is provided with a first oil inlet hole, an inlet of the first oil inlet hole penetrating an end face of the axial first end of the stator core, and an outlet of the first oil inlet hole communicating with the oil inlet channel; and / or the oil outlet channel is located inside the stator core, and an axial second end of the stator core is provided with a first oil outlet hole, an inlet of the first oil outlet hole communicating with the oil outlet channel, and an outlet of the first oil outlet hole penetrating an end face of the axial second end of the stator core.

[0014] In an exemplary embodiment, the stator core comprises: a first stator end plate connected to an axial first end of the core body, the first stator end plate forming an axial first end portion of the stator core; and a second stator end plate connected to an axial second end of the core body, the second stator end plate forming an axial second end portion of the stator core.

[0015] In an exemplary embodiment, the inner side wall of the stator sleeve and / or the outer side wall of the stator sleeve is provided with the first cooling oil channel.

[0016] In an exemplary embodiment, the stator sleeve is a roll-formed integrated structure or a die-cast integrated structure.

[0017] In an exemplary embodiment, the stator core is provided with a stator tooth slot, a radial inner end of the stator tooth slot being open, and the stator slot wedge is fixed at the radial inner end of the stator tooth slot, and the stator slot wedge is a heat-conducting member.

[0018] In an exemplary embodiment, two ends of a radial outer side wall of the stator slot wedge are respectively provided with a first notch and a second notch communicating with the second cooling oil channel, the first notch is arranged to communicate with the cooling cavity on the oil inlet side, and the second notch is arranged to communicate with the cooling cavity on the oil outlet side; or the radial outer side wall of the stator slot wedge is provided with a third notch penetrating both ends of the stator slot wedge, and the third notch is arranged to communicate with the cooling cavity on the oil inlet side and the cooling cavity on the oil outlet side.

[0019] In an exemplary embodiment, the stator slot wedge is made of a flexible material to seal the radial inner end of the stator tooth slot.

[0020] The embodiments of the present application also provide an electric machine comprising the stator assembly of the above-described embodiments.

[0021] The embodiments of the present application also provide a power assembly comprising the electric machine, the oil pump and the oil cooler as described in the above-described embodiments, the oil pump being arranged to provide circulating power for the cooling oil flowing through the stator assembly, and the cooling oil passing through the stator assembly enters the oil cooler and is cooled by the oil cooler.

[0022] This application also provides a vehicle that includes the powertrain described in the above embodiments.

[0023] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the solutions described in the description and the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0025] Figure 1 This is an exploded view of a motor provided in one embodiment of this application;

[0026] Figure 2 for Figure 1 A cross-sectional view of the motor shown;

[0027] Figure 3 for Figure 2 A schematic diagram of the cooling principle of the stator assembly of the motor shown (without the rotor assembly);

[0028] Figure 4 for Figure 1 The image shows a 3D view of the assembled motor.

[0029] Figure 5 An exploded view of a motor provided in another embodiment of this application;

[0030] Figure 6 for Figure 5 A cross-sectional view of the motor shown;

[0031] Figure 7 A three-dimensional structural schematic diagram of an end cap provided in one embodiment of this application;

[0032] Figure 8 for Figure 7 A schematic cross-sectional view of the end cap shown.

[0033] Figure 9 A three-dimensional structural schematic diagram of a sleeve provided in one embodiment of this application;

[0034] Figure 10 for Figure 9 A partial cross-sectional view of the sleeve shown.

[0035] Figure 11 for Figure 10 Enlarged diagram of section A in the middle;

[0036] Figure 12 A three-dimensional structural schematic diagram of a sealing element provided in one embodiment of this application;

[0037] Figure 13 for Figure 12 A cross-sectional view of the seal shown.

[0038] Figure 14 A schematic diagram of the labyrinth seal formed by the sealing element and the sleeve;

[0039] Figure 15 A schematic diagram of the labyrinth seal structure formed by the sleeve and the second stator end plate;

[0040] Figure 16 A cross-sectional view of a stator assembly provided in one embodiment of this application;

[0041] Figure 17 A partial cross-sectional view of a stator core provided in one embodiment of this application;

[0042] Figure 18 This is a schematic diagram of the main structure of a first stator end plate provided in one embodiment of this application;

[0043] Figure 19 This is an enlarged schematic diagram of section B in section 18;

[0044] Figure 20 for Figure 18 A cross-sectional view of the first stator end plate is shown.

[0045] Figure 21 for Figure 20 Enlarged diagram of section C;

[0046] Figure 22 A partial structural diagram of the stator assembly oil inlet side provided in one embodiment of this application;

[0047] Figure 23 for Figure 22 A partial structural schematic diagram of the stator assembly on the oil outlet side;

[0048] Figure 24 A partial structural schematic diagram of a stator core provided in one embodiment of this application;

[0049] Figure 25 This is a schematic diagram of the main structure of a stator core provided in one embodiment of this application;

[0050] Figure 26 for Figure 25 Enlarged schematic diagram of section D in the middle;

[0051] Figure 27This is a schematic diagram of the structure of a stator slot wedge provided in one embodiment of this application;

[0052] Figure 28 for Figure 27 A schematic cross-sectional view of the stator slot wedge shown.

[0053] Figure 29 for Figure 27 A side view of the stator slot wedge structure shown;

[0054] Figure 30 An assembly diagram of a stator core with stator slot wedges provided in one embodiment of this application;

[0055] Figure 31 for Figure 30 Enlarged schematic diagram of section E in the middle;

[0056] Figure 32 This is a schematic diagram of the structure of a stator slot wedge provided in one embodiment of this application;

[0057] Figure 33 for Figure 32 Side view of the stator slot wedge shown;

[0058] Figure 34 An assembly diagram of a stator core with stator slot wedges provided for another embodiment of this application;

[0059] Figure 35 for Figure 34 Enlarged schematic diagram of section F in the middle;

[0060] Figure 36 A three-dimensional structural schematic diagram of a stator sleeve provided in one embodiment of this application;

[0061] Figure 37 for Figure 36 A schematic cross-sectional view of the stator sleeve shown.

[0062] Figure 38 A three-dimensional structural schematic diagram of a stator sleeve provided in another embodiment of this application;

[0063] Figure 39 for Figure 38 A schematic cross-sectional view of the stator sleeve shown.

[0064] Figure 40 A three-dimensional structural schematic diagram of a stator sleeve provided in another embodiment of this application;

[0065] Figure 41 for Figure 40 A schematic cross-sectional view of the stator sleeve shown.

[0066] Figure 42A perspective view of a stator sleeve according to another embodiment of the application is shown in

[0067] Figure 43 A perspective view of a stator sleeve according to another embodiment of the application is shown in Figure 42 A cross-sectional view of the stator sleeve shown in

[0068] Figure 44 A perspective view of a stator sleeve according to another embodiment of the application is shown in

[0069] Figure 45 A cross-sectional view of the stator sleeve shown in Figure 44 A cross-sectional view of the stator sleeve shown in

[0070] Figure 46 A schematic view of cooling oil flow in a stator assembly according to an embodiment of the application is shown in

[0071] Figure 47 A schematic view of cooling principle of a power assembly according to an embodiment of the application is shown in

[0072] Figure 48 A schematic view of cooling principle of a power assembly according to another embodiment of the application is shown in

[0073] Figure 49 A schematic view of a vehicle according to an embodiment of the application is shown in

[0074] Wherein, Figures 1 to 49 The reference signs in the drawings are as follows:

[0075] 1 housing assembly, 11 outer shell, 111 casing, 1111 oil inlet, 1112 water cooling channel, 1113 water inlet, 1114 water outlet, 112 end cover, 1121 oil outlet, 113 first mounting groove, 12 partition, 120 sleeve, 121 first sleeve, 122 second sleeve, 123 first sealing ring, 124 first sealing groove, 125 third sealing ring, 126 third sealing groove, 13 cooling cavity, 14 sealing member, 141 sealing body, 142 second sealing ring, 143 second sealing groove, 15 sealing glue;

[0076] 2 stator assembly, 21 stator core, 211 first stator end plate, 2111 first oil inlet hole, 2112 second oil inlet hole, 2113 oil inlet flow channel, 2114 first transition flow channel, 212 second stator end plate, 2121 first oil outlet hole, 2122 second oil outlet hole, 2123 oil outlet flow channel, 213 core body, 214 stator sleeve, 2141 first cooling oil channel, 215 stator tooth slot, 2151 shoulder, 216 second mounting groove, 22 stator coil, 221 end winding, 23 stator slot wedge, 231 first notch, 232 second notch, 233 third notch, 234 second cooling oil channel;

[0077] 3 rotor assembly, 31 third cooling oil passage; 4 motor controller; 5 oil pump; 6 oil cooler; 7 water pump; 8 water cooler; 100 vehicle. DETAILED DESCRIPTION

[0078] With the increasing requirement of power performance of electric vehicles, the torque density and power density of the power assembly, as one of the core components of the power output of the electric vehicles, also increase to realize the light weight and small size of the motor. The motor, as the core component of the power assembly, is the key to the power output of the power assembly, and directly determines the power output of the power assembly and the power performance of the vehicle.

[0079] And improving the heat dissipation capacity of the motor is an important scheme to improve the torque density and power density of the motor. Therefore, how to further improve the heat dissipation capacity of the motor is the direction and research focus of the technical personnel in the field.

[0080] To make the purpose, technical scheme and advantages of the present application more clear and obvious, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0081] As shown in Figure 1 , in an exemplary embodiment, the motor comprises a housing assembly 1, a stator assembly 2 and a rotor assembly 3.

[0082] The housing assembly 1 is provided with a cooling cavity 13 for the cooling oil to flow, as shown in Figure 2 and Figure 3 . The housing assembly 1 is provided with an oil inlet 1111 and an oil outlet 1121 communicating with the cooling cavity 13.

[0083] The stator assembly 2 is at least partially arranged in the cooling cavity 13, so that the stator assembly 2 can be at least partially immersed in the cooling oil.

[0084] The rotor assembly 3 is rotatably sleeved on the inner side of the stator assembly 2.

[0085] In this embodiment, the housing assembly 1 is provided with a cooling cavity 13. Cooling oil can enter the cooling cavity 13 through an oil inlet 1111 of the housing assembly 1 and flow out of the cooling cavity 13 through an oil outlet 1121 of the housing assembly 1. Since at least a part of the stator assembly 2 is located in the cooling cavity 13, at least a part of the stator assembly 2 can be immersed in the cooling oil in the cooling cavity 13 and directly contact the cooling oil, realizing contact oil cooling. In this way, the cooling oil can be in full contact with the stator assembly 2 under the action of hydraulic pressure, so that the stator assembly 2 and the cooling oil can have a relatively large contact area, increasing the heat dissipation area of the stator assembly 2, and the flowing cooling oil can timely take away the heat of the stator assembly 2, thus greatly improving the heat dissipation efficiency of the motor compared with the oil shower cooling scheme.

[0086] In an exemplary embodiment, the stator assembly 2 includes a stator core 21 and a stator coil 22, as shown in Figure 16

[0087] As shown in Figure 2 , at least a part of the stator core 21 is located in the cooling cavity 13. The stator coil 22 is located in the cooling cavity 13 and fixed to the stator core 21.

[0088] The stator assembly 2 includes a stator core 21 and a stator coil 22. Since at least a part of the stator core 21 is located in the cooling cavity 13, at least a part of the stator core 21 can be immersed in the cooling oil. In this way, the cooling oil can directly realize contact heat conduction with the stator core 21 and timely take away the heat of the stator core 21. And the stator coil 22 is also located in the cooling cavity 13, so the stator coil 22 can also be immersed in the cooling oil. In this way, the cooling oil can directly realize contact heat conduction with the stator coil 22 and timely take away the heat of the stator coil 22. In this way, the stator core 21 and the stator coil 22 can both realize contact heat conduction with the cooling oil, and the generated heat can be timely taken away by the flowing cooling oil, thereby ensuring that the motor has a high heat dissipation efficiency.

[0089] In an exemplary embodiment, the rotor assembly 3 is separated from the cooling cavity 13 to limit the cooling oil in the cooling cavity 13 from contacting the rotor assembly 3. In other words, the cooling cavity 13 is a sealed cavity, and the rotor assembly 3 is located outside the cooling cavity 13.

[0090] In this way, the cooling oil in the cooling cavity 13 for cooling the stator assembly 2 can be prevented from contacting the rotor assembly 3, thereby fundamentally avoiding the occurrence of oil stirring loss.

[0091] In an exemplary embodiment, as shown in Figure 1 ​As shown, the housing assembly 1 comprises an outer shell 11 and a partition 12. The outer shell 11 is provided with an oil inlet 1111 and an oil outlet 1121. The partition 12 is fixed in the outer shell 11 and cooperates with the outer shell 11 to define at least part of a cooling cavity 13.

[0092] As shown, the partition 12 comprises at least one sleeve 120, which is sealingly connected to the outer shell 11. Figure 14 The sleeve 120 sealingly connected to the end cover 112 is referred to as a first sleeve 121, and the sleeve 120 sealingly connected to the casing 111 is referred to as a second sleeve 122.

[0093] Since the housing assembly 1 comprises the outer shell 11 and the partition 12, the partition 12 is fixed in the outer shell 11 and can cooperate with the outer shell 11 to define at least part of the cooling cavity 13. In addition, since the partition 12 comprises at least one sleeve 120, and the sleeve 120 is sealingly connected to the outer shell 11, the cooling oil in the cooling cavity 13 can be prevented from leaking out of the cooling cavity 13 through the gap between the sleeve 120 and the outer shell 11, which is beneficial to preventing the cooling oil in the cooling cavity 13 from leaking and contacting the rotor assembly 3 to cause oil stirring loss.

[0094] As the sleeve 120 is adjacent to the stator coil 22, the sleeve 120 must have good insulation and anti-cutting properties, and low magnetic permeability. Therefore, the material of the sleeve 120 can be, but is not limited to, polymeric resin material, carbon fiber, carbon fiber composite material, glass fiber composite, etc.

[0095] In an exemplary embodiment, the sleeve 120 is sealingly connected to the outer shell 11 by a sealing member 14.

[0096] The outer shell 11 is provided with a first mounting groove 113, as shown in Figure 8 The sealing member 14 is mounted in the first mounting groove 113, as shown in Figure 12 and Figure 14

[0097] As shown in Figure 9 , Figure 10 and Figure 11 , one end of the sleeve 120 connected to the outer shell 11 is provided with two first sealing rings 123 arranged concentrically, and a first sealing groove 124 is formed between the two first sealing rings 123.

[0098] As shown in Figure 12 and Figure 13 , the sealing member 14 comprises a sealing body 141 and two second sealing rings 142 connected to the sealing body 141, the two second sealing rings 142 are arranged concentrically, and a second sealing groove 143 is formed between the two second sealing rings 142.

[0099] As shown in Figure 14 ​As shown, one of the first sealing rings 123 is inserted into the second sealing groove 143 and sealingly engages with the groove wall of the second sealing groove 143, and one of the second sealing rings 142 is inserted into the first sealing groove 124 and sealingly engages with the groove wall of the first sealing groove 124.

[0100] In this way, the sleeve 120 and the sealing member 14 form a mutual embedding structure, forming multiple sealing surfaces, causing the leakage path of the cooling oil to be serpentine, thus increasing the length of the leakage surface, forming a labyrinth sealing structure, thus having a reliable sealing effect.

[0101] Alternatively, the sleeve 120 can also not be provided with two first sealing rings 123, and the end of the sleeve 120 is directly inserted into the second sealing groove 143 of the sealing member 14 to achieve sealing cooperation, at this time the penetration path is U-shaped, also has a longer length, and also has a better sealing effect.

[0102] Of course, the sealing member 14 can also use a common O-shaped sealing ring, or can also be directly sealed by the sealing glue 15. However, the O-shaped sealing ring and the sealing glue 15 all require sufficient sealing space, and the thickness of the O-shaped sealing ring and the thickness of the cured sealing glue 15 will be added to the axial dimension of the motor, causing the motor to increase the requirement for assembly space.

[0103] The labyrinth sealing scheme of the embodiment of the application makes full use of the internal space of the sealing member 14 itself and the internal space of the sleeve 120, facilitates sealing in a small space, can avoid the increase of the axial dimension of the motor, is conducive to the miniaturization of the motor, and reduces the requirement of the motor for assembly space.

[0104] In an exemplary embodiment, the first sealing groove 124 and / or the second sealing groove 143 can be provided with sealing glue 15, as shown. Figure 14 In this way, the sealing reliability can be further improved.

[0105] During assembly, the sealing glue 15 has high fluidity, and the sleeve 120 and the sealing member 14 can be extruded during assembly, extruding the sealing glue 15 into the first sealing groove 124 / second sealing groove 143, and forming a reliable seal after the sealing glue 15 is cured.

[0106] In this way, the sleeve 120 and the sealing member 14 realize double sealing effect through extrusion interference and glue injection, and the sealing is more reliable.

[0107] In an exemplary embodiment, as shown in Figure 1 and Figure 2As shown, the shell 11, the partition 12 and the stator assembly 2 enclose the cooling cavity 13, the sleeve 120 is provided in two, one end of the sleeve 120 is sealingly connected with the shell 11, and the other end of the sleeve 120 is sealingly connected with the axial end of the stator core 21 of the stator assembly 2.

[0108] The scheme utilizes the shell 11, the partition 12 and the stator assembly 2 to enclose the cooling cavity 13, and only relatively short sleeves 120 need to be respectively arranged on the axial two sides of the stator core 21. Compared with arranging an entire sleeve 120 to connect the axial two ends of the shell 11, the scheme is beneficial to shorten the total length of the sleeve 120, save the material of the sleeve 120, and thus reduce the production cost, and can also avoid the sleeve 120 penetrating through the entire air gap.

[0109] In the scheme, the inner side wall of the stator core 21 participates in the enclosure of the cooling cavity 13, and thus the inner side wall of the stator core 21 is equivalent to being located outside the cooling cavity 13, and the stator assembly 2 is partially located inside the cooling cavity 13. However, since the two axial end portions and the radial inner portion and the radial outer portion of the stator core 21 are all provided with cooling oil channels, the stator assembly 2 also has relatively high heat dissipation efficiency.

[0110] On the other hand, the sleeve 120 is also sealingly connected with the axial end portion of the stator core 21, which can effectively prevent the cooling oil in the cooling cavity 13 from leaking to the rotor assembly 3 through the connecting portion of the sleeve 120 and the stator core 21, and thus is beneficial to avoid oil stirring loss.

[0111] The stator core 21 is provided with a stator tooth slot 215, as shown in Figure 30 and Figure 34 The radial inner end of the stator tooth slot 215 is open. The stator core 21 further includes a stator slot wedge 23, the stator slot wedge 23 is fixed at the radial inner end of the stator tooth slot 215, and the stator slot wedge 23 is a heat-conducting member. For the scheme that the radial inner end of the stator tooth slot 215 is open and the stator slot wedge 23 is a sealing member 14, the stator slot wedge 23 also seals the inner side of the stator core 21. For the scheme that the radial inner end of the stator tooth slot 215 is closed, the inner side wall of the stator core 21 also forms a seal.

[0112] In this way, the cooling cavity 13 forms a sealed cavity and is separated from the rotor assembly 3, which can effectively prevent the cooling oil in the cooling cavity 13 from leaking and contacting the rotor assembly 3, and thus can fundamentally avoid the occurrence of oil stirring loss.

[0113] In an exemplary embodiment, as shown in Figure 15 The axial end of the stator core 21 is provided with a second mounting groove 216. The end of the stator core 21 connected with the sleeve 120 is provided with two third sealing rings 125 arranged concentrically, and a third sealing groove 126 is formed between the two third sealing rings 125.

[0114] One of the third sealing rings 125 is inserted into the second mounting groove 216 and sealingly engages with the groove wall of the second mounting groove 216. The second mounting groove 216 and / or the third sealing groove 126 is provided with the sealing glue 15.

[0115] In this way, the sleeve 120 and the stator core 21 also form a mutually nested labyrinth sealing structure, and the sealing glue 15 can ensure sealing reliability, so as to effectively prevent the cooling oil from leaking to the rotor assembly 3 and avoid oil stirring loss.

[0116] In this way, the axial end portions of the sleeve 120 and the stator core 21 can also be double-sealed by extrusion interference and glue injection, and the sealing is more reliable.

[0117] Among them, the first stator end plate 211 forms the first axial end portion of the stator core 21, and the second stator end plate 212 forms the second axial end portion of the stator core 21. Therefore, the first stator end plate 211 and the second stator end plate 212 of the stator core 21 are both provided with the second mounting groove 216, as shown in Figure 20 and Figure 21 The first stator end plate 211 and the second stator end plate 212 are respectively sealingly connected with the two sleeves 120 through a labyrinth sealing scheme.

[0118] Alternatively, the sleeve 120 can also not be provided with two third sealing rings 125, and the end portion of the sleeve 120 is directly inserted into the second mounting groove 216 to achieve sealing cooperation, at this time the penetration path is U-shaped, also has a longer length, and also has a better sealing effect.

[0119] In an exemplary embodiment, the housing 11 and the partition 12 enclose the cooling cavity 13, the number of sleeves 120 is one, the sleeve 120 is sleeved on the inner side of the stator assembly 2, and the two ends of the sleeve 120 are sealingly connected with the housing 11.

[0120] This scheme utilizes the housing 11 and the partition 12 to form the cooling cavity 13, so that the stator assembly 2 and the rotor assembly 3 are completely separated by the partition 12, which can fundamentally avoid oil stirring loss. Moreover, the stator assembly 2 can be completely located in the cooling cavity 13, so that the stator assembly 2 can be completely immersed in the cooling oil, thereby having a higher heat dissipation efficiency.

[0121] In an exemplary embodiment, as shown in Figure 1 The housing 11 includes a casing 111 and an end cover 112.

[0122] Among them, one end of the casing 111 is provided as an open end. The end cover 112 is covered at the open end of the casing 111 and is fixedly connected with the casing 111. One of the casing 111 and the end cover 112 is provided with an oil inlet 1111, and the other is provided with an oil outlet 1121.

[0123] In one example, the casing 111 is open at the rear end, and an end cover 112 is arranged at the rear end of the casing 111. An oil inlet 1111 is arranged at the front end of the casing 111, and an oil outlet 1121 is arranged on the end cover 112, as shown in Figure 7 and Figure 8 The front end of the casing 111 is provided with a first mounting groove 113, and the end cover 112 is also provided with a first mounting groove 113, as shown in Figure 2 、 Figure 6 and Figure 8

[0124] The sleeve 120 sealingly connected with the end cover 112 is referred to as a first sleeve 121, and the sleeve 120 sealingly connected with the casing 111 is referred to as a second sleeve 122. In the assembly process, after the stator core 21 and the stator coil 22 are assembled, the second sleeve 122 and the casing 111 are assembled and sealed. Then, the first sleeve 121 and the end cover 112 are assembled and sealed.

[0125] In this way, the end cover 112, the first sleeve 121, the casing 111, the second sleeve 122, and the stator core 21 form a cooling cavity 13, and the cooling cavity 13 is filled with cooling oil. Most of the stator assembly 2 (except the inner side wall of the stator core 21) can be immersed in the cooling cavity 13, and the cooling oil flows in the cooling cavity 13. The contact oil cooling is adopted, and the heat of the stator assembly 2 is taken away in time, which greatly improves the heat dissipation efficiency of the motor compared with the oil showering scheme.

[0126] In this way, the end cover 112, the first sleeve 121, the casing 111, the second sleeve 122, and the stator core 21 form a cooling cavity 13, and the cooling cavity 13 is filled with cooling oil. Most of the stator assembly 2 (except the inner side wall of the stator core 21) can be immersed in the cooling cavity 13, and the cooling oil flows in the cooling cavity 13. The contact oil cooling is adopted, and the heat of the stator assembly 2 is taken away in time, which greatly improves the heat dissipation efficiency of the motor compared with the oil showering scheme.

[0127] Of course, the casing can also be open at both ends, and the shell includes the casing and two end covers, and the two end covers are connected to the two ends of the casing, respectively. At this time, one end cover is provided with an oil inlet, and the other end cover is provided with an oil outlet. Alternatively, the casing can be open at the front end, and the end cover is a front end cover.

[0128] In an exemplary embodiment, as shown in Figures 1 to 4 The number of oil inlets 1111 is multiple, and the multiple oil inlets 1111 are arranged at intervals along the circumference of the motor. The number of oil outlets 1121 is multiple, and the multiple oil outlets 1121 are arranged at intervals along the circumference of the motor. In this way, it is beneficial to improve the flow of cooling oil in the cooling cavity 13, thereby improving the heat dissipation efficiency of the motor and improving the uniformity of heat dissipation.

[0129] ​In one example, the number of oil inlets 1111 is two, as shown in Figure 1 and Figure 4 The two oil inlets 1111 are symmetrically arranged. The number of oil outlets 1121 is two, and the two oil outlets 1121 are symmetrically arranged.

[0130] In an exemplary embodiment, as shown in Figure 2 , the rotor assembly 3 is hollow inside, and the inner cavity of the rotor assembly 3 forms a third cooling oil channel 31 for cooling the rotor assembly 3, so that the cooling oil can also enter the rotor assembly 3 to cool the rotor assembly 3. In this way, the stator assembly 2 and the rotor assembly 3 are each cooled efficiently by cooling oil, ensuring the heat dissipation efficiency of the motor.

[0131] In an exemplary embodiment, as shown in Figure 2 , Figure 3 and Figure 4 The housing 111 is also provided with a water cooling channel 1112 and a water inlet 1113 and a water outlet 1114 communicating with the water cooling channel 1112, and the water cooling channel 1112 is arranged around the side wall of the housing 111.

[0132] The water cooling channel 1112 can timely remove the heat of the cooling oil in the cooling cavity 13 by cooling water, thereby realizing a mixed cooling scheme of oil cooling and water cooling, and further improving the heat dissipation efficiency of the motor.

[0133] In one example, as shown in Figure 1 and Figure 4 The water inlet 1113 and the water outlet 1114 of the water cooling channel 1112 are arranged on the side wall of the housing 111, and one is located at the front of the side wall of the housing 111, and the other is located at the rear of the side wall of the housing 111. By circulating the cooling water, a water cooling scheme is formed, which can further improve the heat dissipation efficiency of the motor.

[0134] In an exemplary embodiment, the water cooling channel 1112 is coiled around the housing 111 in a spiral shape, as shown in Figure 2 and Figure 3 Alternatively, the cross section of the water cooling channel 1112 is in the shape of a circular ring, and the side wall of the housing 111 is arranged in a hollow structure or an inner and outer nested structure.

[0135] In this way, the cooling water and the circumferential cooling oil of the stator assembly 2 can fully exchange heat, thereby further improving the heat dissipation efficiency of the motor.

[0136] In one example, the water of the cooling channel comes from the cooling water of the motor controller 4. In other words, the cooling water cooled by the motor controller 4 enters the water cooling channel 1112 of the motor housing 111 to remove the heat of the cooling oil in the motor.

[0137] Of course, the water cooling channel 1112 can also not be provided, as shown in Figure 5 and Figure 6 .

[0138] As shown in Figure 2 , Figure 3 , Figure 6 , Figure 16 , Figure 17 , one embodiment of the present application provides a stator core 21, which is provided with an oil inlet flow channel 2113, a first cooling oil channel 2141 and an oil outlet flow channel 2123 which are sequentially communicated. The oil inlet flow channel 2113 is arranged at an axial first end portion of the stator core 21, the oil outlet flow channel 2123 is arranged at an axial second end portion of the stator core 21, and the first cooling oil channel 2141 is arranged at a side portion of the stator core 21.

[0139] The oil inlet flow channel 2113 is arranged to be communicated with an oil inlet port 1111 of the motor, and the oil outlet flow channel 2123 is arranged to be communicated with an oil outlet port 1121 of the motor.

[0140] The stator core 21 provided by the embodiment of the present application can enable the cooling oil entering the cooling cavity 13 through the oil inlet port 1111 to enter the oil inlet flow channel 2113, so as to cool the axial first end portion of the stator core 21; then the cooling oil can enter the first cooling oil channel 2141 through the oil inlet flow channel 2113, so as to cool the side portion of the stator core 21; then the cooling oil can enter the oil outlet flow channel 2123 through the first cooling oil channel 2141, so as to cool the axial second end portion of the stator core 21; and finally the cooling oil can flow out through the oil outlet port 1121. In this way, the two axial end portions and the side portion of the stator core 21 can be in contact with the cooling oil for heat conduction, and the generated heat can be timely taken away by the flowing cooling oil, so as to greatly increase the heat dissipation area of the stator core 21, thereby ensuring that the stator core 21 can have a higher heat dissipation efficiency.

[0141] In an exemplary embodiment, as shown in Figure 17 , the oil inlet flow channel 2113 extends along the radial direction of the stator core 21, and a radial outer end of the oil inlet flow channel 2113 is communicated with the first cooling oil channel 2141. The oil outlet flow channel 2123 extends along the radial direction of the stator core 21, and a radial outer end of the oil outlet flow channel 2123 is communicated with the first cooling oil channel 2141.

[0142] The oil inlet flow channel 2113 and the oil outlet flow channel 2123 extend along the radial direction of the stator core 21, and have a relatively regular structure, which is convenient for processing and forming. The radial outer end of the oil inlet flow channel 2113 and the radial outer end of the oil outlet flow channel 2123 are communicated with the first cooling oil channel 2141, so that the first cooling oil channel 2141 is located at a position which is radially outward of the stator core 21 (radially outer portion), which is convenient for cooling the periphery of the stator core 21, and is conducive to increasing the heat dissipation area of the stator core 21.

[0143] The specific shape of the first cooling oil passage 2141 is not restricted.

[0144] In one example, such as Figure 17 , Figure 36 and Figure 37 As shown, the first cooling oil channel 2141 extends circumferentially and axially along the stator core 21 in a spiral shape.

[0145] exist Figure 17 , Figure 36 and Figure 37 In this design, the rotation angle of the first cooling oil channel 2141 is less than 360°, such as approximately 30°, 60°, 90°, 120°, 150°, 180°, 270°, 300°, etc. In other words, the first cooling oil channel 2141 is a spiral oil channel, but it only rotates slightly around the stator core 21 and does not rotate to form a complete circle. Therefore, the cooling oil in the first cooling oil channel 2141 still flows roughly along the axial direction of the stator core 21, that is, the first cooling oil channel 2141 is still an axial flow channel.

[0146] Of course, the rotation angle of the first cooling oil passage 2141 can also be equal to 360° or greater than 360°. In this case, the first cooling oil passage 2141 is a spiral oil passage with a large rotation amplitude, forming a complete circle structure, such as forming a spiral oil passage with three or four circles.

[0147] In one example, such as Figure 38 and Figure 39 As shown, the first cooling oil channel 2141 extends along the axial direction of the stator core 21 and is in a straight line, serving as an axial flow channel.

[0148] In the two examples above, the first cooling oil passage 2141 flows approximately along the axial direction of the motor, and the flow path is approximately equal to the axial length of the motor. Since the axial length of the motor is relatively small, the axial flow passage of this design can shorten the oil return cycle.

[0149] Traditional oil-spraying cooling systems mostly use radial oil paths. Cooling oil is sprayed from the spray pipes, flowing along the highest point of the stator core 21's outer circumference to the lowest point, and then returning to the oil reservoir. The other path creeps along the outer circumference of the stator coil 22 to its lowest point and back to the oil reservoir. Both paths are radial, and there are no cooling channels inside the stator core 21. The flow path of the cooling oil is greater than or equal to half the circumferential dimension of the motor, resulting in a relatively long path. The creeping path of the cooling oil is longer than that of the axial flow path, leading to a longer return cycle.

[0150] In other examples, such as Figure 40 and Figure 41As shown, the first cooling oil channel 2141 includes a plurality of annular oil channels and a plurality of gap oil channels. The annular oil channels extend along the circumferential direction of the stator core 21 and are annular. The plurality of annular oil channels are arranged at intervals along the axial direction of the stator core 21. The gap oil channels are arranged between adjacent annular oil channels and can extend along the axial direction of the stator core 21 to connect the adjacent annular oil channels. In this way, the cooling oil on the side of the stator core 21 can also flow from the first axial end to the second axial end of the stator core 21. Alternatively, the first cooling oil channel 2141 can be in a mesh shape, as shown in Figure 42 and Figure 43 .

[0151] Of course, the shape of the first cooling oil channel 2141 can also be any combination of the above examples, or other shapes such as a wavy shape, a zigzag shape, etc.

[0152] In an exemplary embodiment, the first cooling oil channel 2141 is located inside the stator core 21, facilitating effective heat dissipation inside the stator core 21 and timely heat dissipation from the inside of the stator core 21.

[0153] In an exemplary embodiment, the oil inlet flow channel 2113 is located inside the stator core 21. The first axial end of the stator core 21 is provided with a first oil inlet hole 2111, as shown in Figure 18 , Figure 19 and Figure 24 . The inlet of the first oil inlet hole 2111 penetrates the end face of the first axial end of the stator core 21, so that the first oil inlet hole 2111 can communicate with the oil inlet 1111. The outlet of the first oil inlet hole 2111 communicates with the oil inlet flow channel 2113.

[0154] The oil outlet flow channel 2123 is located inside the stator core 21. The second axial end of the stator core 21 is provided with a first oil outlet hole 2121 (as shown in Figure 15 . The inlet of the first oil outlet hole 2121 communicates with the oil outlet passage. The outlet of the first oil outlet hole 2121 penetrates the end face of the second axial end of the stator core 21, so that the first oil outlet hole 2121 can communicate with the oil outlet 1121.

[0155] In this embodiment, the first oil inlet hole 2111 is provided at the first axial end of the stator core 21, so that the cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the oil inlet flow channel 2113 of the stator core 21 through the first oil inlet hole 2111, and then enter the first cooling oil channel 2141.

[0156] The first oil outlet hole 2121 is provided at the second axial end of the stator core 21, so that the cooling oil output by the first cooling oil channel 2141 can enter the first oil outlet hole 2121 through the oil outlet flow channel 2123, and then flow out of the stator core 21, and finally be discharged through the oil outlet 1121.

[0157] In an exemplary embodiment, the axial first end of the stator core 21 is provided with a second oil inlet hole 2112, as shown in Figure 19 and Figure 22 The second oil inlet hole 2112 is arranged corresponding to the radial middle part of the stator teeth of the stator core 21, and the second oil inlet hole 2112 communicates with the oil inlet flow channel 2113.

[0158] As shown in Figure 23 , the axial second end of the stator core 21 is provided with a first oil outlet hole 2122, which is arranged corresponding to the radial middle part of the stator teeth of the stator core 21, and the first oil outlet hole 2122 communicates with the oil outlet flow channel 2123.

[0159] In this way, the second oil inlet hole 2112 is opposite to the middle position of the end winding 221 of the side stator coil 22, as shown in Figure 22 The end winding 221 of the side stator coil 22 is immersed in the cooling oil, and the cooling oil flows through the middle position of the end winding 221 of the side stator coil 22 into the second oil inlet hole 2112 to cool the inside of the end winding 221 of the side stator coil 22, so that the inside and outside of the end winding 221 of the side stator coil 22 can be uniformly cooled, avoiding the uneven cooling caused by the oil showering cooling which can only cool the outside of the end winding 221 of the stator coil 22, and avoiding the existence of the heat dissipation dead zone. The cooling oil uniformly cooled after cooling the end winding 221 of the side stator coil 22 can flow into the first cooling flow channel through the oil inlet flow channel 2113 to ensure the flowability of the cooling oil.

[0160] The first oil outlet hole 2122 is opposite to the middle position of the end winding 221 of the side stator coil 22, as shown in Figure 23 The end winding 221 of the side stator coil 22 is immersed in the cooling oil, and the cooling oil flowing out of the second cooling oil channel 234 can flow to the first oil outlet hole 2122 through the oil outlet flow channel 2123, and then cool the inside of the end winding 221 of the side stator coil 22, so that the inside and outside of the end winding 221 of the side stator coil 22 can be uniformly cooled, avoiding the uneven cooling caused by the oil showering cooling which can only cool the outside of the end winding 221 of the stator coil 22, and avoiding the existence of the heat dissipation dead zone.

[0161] In an exemplary embodiment, as shown in Figure 18 and Figure 19 The number of oil inlet flow channels 2113 is multiple, and the multiple oil inlet flow channels 2113 are arranged along the circumference of the stator core 21, for example, uniformly arranged.

[0162] The number of oil outlet flow channels 2123 is multiple, and the multiple oil outlet flow channels 2123 are arranged along the circumference of the stator core 21, for example, uniformly arranged.

[0163] The first cooling oil channels 2141 are provided in a plurality of numbers and are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly as shown in Figure 36 and Figure 37 .

[0164] The first oil inlet holes 2111 are provided in a plurality of numbers and are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly as shown in Figure 18 and Figure 19 .

[0165] The second oil inlet holes 2112 are provided in a plurality of numbers and are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly as shown in Figure 18 and Figure 19 .

[0166] The first oil outlet holes 2121 are provided in a plurality of numbers and are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly.

[0167] The second oil outlet holes 2122 are provided in a plurality of numbers and are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly.

[0168] In one example, the plurality of first oil inlet holes 2111 can be provided in one-to-one correspondence with the plurality of oil inlet flow channels 2113 (of course, they can also be provided without one-to-one correspondence) as shown in Figure 18 and Figure 19 . The plurality of first oil outlet holes 2121 can be provided in one-to-one correspondence with the plurality of oil outlet flow channels 2123 (of course, they can also be provided without one-to-one correspondence). The plurality of oil inlet flow channels 2113, the plurality of first cooling oil channels 2141, and the plurality of oil outlet flow channels 2123 are provided in one-to-one correspondence (of course, they can also be provided without one-to-one correspondence).

[0169] In one example, the plurality of first oil inlet holes 2111 and the plurality of second oil inlet holes 2112 are arranged at intervals in the circumferential direction of the stator core 21, for example, uniformly as shown in Figure 18 and Figure 19 .

[0170] In one example, the number of second oil inlet holes 2112 is equal to the number of stator teeth and is provided in one-to-one correspondence.

[0171] In other examples, the number of second oil inlet holes 2112 is not equal to the number of stator teeth, for example, is half the number of stator teeth or is an integer multiple of the number of stator teeth, of course, there can be no correspondence in the number. The plurality of second oil inlet holes 2112 can be arranged uniformly in the circumferential direction of the stator core 21.

[0172] The above schemes are beneficial to uniform distribution of the cooling oil flow, thereby improving the heat dissipation uniformity of the stator assembly 2 and avoiding the existence of heat dissipation dead zones.

[0173] In an exemplary embodiment, the axial first end of the stator core 21 is further provided with a first transition flow channel 2114 extending in a ring shape along the circumference of the stator core 21, as shown in Figure 19 The first transition flow channel 2114 is arranged to communicate the oil inlet flow channel 2113, the first oil inlet hole 2111 and the second oil inlet hole 2112.

[0174] The axial second end of the stator core 21 is further provided with a second transition flow channel extending in a ring shape along the circumference of the stator core 21, and the second transition flow channel is arranged to communicate the oil outlet flow channel 2123, the first oil outlet hole 2121 and the second oil outlet hole 2122.

[0175] In this way, the first axial end and the second axial end of the stator core 21 have a larger heat dissipation area, and thus have a higher heat dissipation efficiency.

[0176] In an exemplary embodiment, as shown in Figure 17 The stator core 21 includes a core body 213, a first stator end plate 211, a second stator end plate 212 and a stator sleeve 214.

[0177] The first stator end plate 211 is connected to the axial first end of the core body 213, and forms the axial first end of the stator core 21.

[0178] The second stator end plate 212 is connected to the axial second end of the core body 213, and forms the axial second end of the stator core 21.

[0179] The stator sleeve 214 is sleeved outside the core body 213, and the stator sleeve 214 is provided with a first cooling oil channel 2141.

[0180] In this embodiment, the stator core 21 includes the core body 213, the first stator end plate 211, the second stator end plate 212 and the stator sleeve 214. The core body 213 can be formed by laminating stator punching sheets. The first stator end plate 211 and the second stator end plate 212 are fixed at the axial two ends of the core body 213, and form the first axial end and the second axial end of the stator core 21, respectively. The first stator end plate 211 is provided with the oil inlet flow channel 2113, the first oil inlet hole 2111, the second oil inlet hole 2112, the first transition flow channel 2114 and the like, as shown in Figure 18 and Figure 19The second stator end plate 212 is provided with an oil outlet flow channel 2123, a first oil outlet hole 2121, a second oil outlet hole 2122, and a second transition flow channel, etc. The stator sleeve 214 is sleeved outside the core main body 213 to form the outer side of the stator core 21. The stator sleeve 214 is provided with a first cooling flow channel, so that the first cooling flow channel is located on the outer side of the stator core 21, which is beneficial to increase the heat dissipation area of the side of the stator core 21 and facilitate the timely removal of the heat generated by the stator core 21. Figures 36 to 45

[0181] Of course, if a flow channel hole extending in the circumferential direction of the stator sleeve 214 is arranged at the center position of the stator sleeve 214, it can also be changed to a radial flow channel cooling scheme, which has high variability. If the first stator end plate 211 and the second stator end plate 212 are removed, and the length of the stator sleeve 214 is matched with the stator core 21, it can be converted to an oil shower scheme.

[0182] In an exemplary embodiment, the first cooling oil channel 2141 penetrates the inner side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in Figures 36 to 43 In other words, the inner side wall of the stator sleeve 214 is provided with the first cooling oil channel 2141.

[0183] In this way, the cooling oil in the first cooling oil channel 2141 can directly contact the core main body 213, and the heat of the core main body 213 can be removed in a timely manner, thereby facilitating further improvement of the heat dissipation efficiency of the stator core 21. Moreover, this can also reduce the processing difficulty of the stator sleeve 214, facilitate the molding of the stator sleeve 214, and further reduce the production cost.

[0184] In an exemplary embodiment, the first cooling oil channel 2141 penetrates the outer side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in Figure 44 and Figure 45 In other words, the outer side wall of the stator sleeve 214 is provided with the first cooling oil channel 2141.

[0185] In this way, the cooling oil in the first cooling oil channel 2141 can directly contact the inner side wall of the housing assembly 1, and the heat of the stator core 21 can be conducted to the housing assembly 1 in a timely manner, thereby also facilitating further improvement of the heat dissipation efficiency of the stator core 21. Moreover, this can also reduce the processing difficulty of the stator sleeve 214, facilitate the molding of the stator sleeve 214, and further reduce the production cost.

[0186] In an exemplary embodiment, the inner side wall and the outer side wall of the stator sleeve 214 are both provided with the first cooling oil channel 2141.

[0187] ​The first cooling oil channels 2141 located at the inner side wall and the outer side wall of the stator sleeve 214 can be mutually through and combined to form a cooling oil channel through the inner side wall and the outer side wall of the stator sleeve 214.

[0188] The first cooling oil channels 2141 located at the inner side wall and the outer side wall of the stator sleeve 214 can also be independent of each other. For example, the first cooling oil channels 2141 located at the inner side wall of the stator sleeve 214 can be staggered with the first cooling oil channels 2141 located at the outer side wall of the stator sleeve 214. In this way, it is beneficial to uniform heat dissipation and reduce the wall thickness of the stator sleeve 214.

[0189] In an exemplary embodiment, the stator sleeve 214 is a roll-formed integrated structure (which can be machined by a roll with a fixed shape) or a die-cast integrated structure.

[0190] In an exemplary embodiment, the end surface of the first stator end plate 211 facing away from the core body 213 is provided with a second mounting groove 216, and the end surface of the second stator end plate 212 facing away from the core body 213 is also provided with a second mounting groove 216, and the second mounting groove 216 is used for sealing connection with the sleeve 120 of the motor. As for the specific sealing connection method, it will be described in detail in the embodiment of the motor.

[0191] In an exemplary embodiment, the stator core 21 is provided with a stator tooth slot 215, as shown in Figure 30 and Figure 34 The radially inner end of the stator tooth slot 215 is open. The stator core 21 further comprises a stator slot wedge 23.

[0192] The stator slot wedge 23 is fixed at the radially inner end of the stator tooth slot 215, and the stator slot wedge 23 is a heat-conducting member. The stator slot wedge 23 is provided with a second cooling oil channel 234 extending along the axial direction of the stator core 21 (i.e. extending along the length direction of the stator slot wedge 23), as shown in Figure 29 、 Figure 33 and Figure 35 The second cooling flow channel is in communication with the oil inlet 1111 and the oil outlet 1121.

[0193] Further, the stator slot wedge 23 is made of a flexible material to seal the radially inner end of the stator tooth slot 215.

[0194] The stator slot of the present scheme has a sealing effect, which can prevent the cooling oil in the cooling cavity 13 from entering the assembly space of the rotor assembly 3 through the stator tooth slot 215 to contact the rotor assembly 3, thereby avoiding the loss of cooling oil caused by the rotation of the rotor assembly 3, and improving the utilization rate of the cooling oil.

[0195] On the other hand, the stator slot wedge 23 is also provided with a second cooling oil channel 234, the cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the second cooling oil channel 234, flow along the axial direction of the stator core 21 to the other end of the stator core 21, and then flow out through the oil outlet 1121. In this way, since the stator slot wedge 23 is a heat-conducting member, the cooling oil in the second cooling oil channel 234 can cool the inner side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slot 215, thereby further improving the heat dissipation efficiency of the motor. Figure 3 and Figure 46 As shown in the figures, the cooling oil in the cooling cavity 13 can flow into the first cooling oil channel 233 through the oil inlet 1111, flow along the axial direction of the stator core 21 to the other end of the stator core 21, and then flow out through the oil outlet 1121. In this way, since the stator slot wedge 23 is a heat-conducting member, the cooling oil in the first cooling oil channel 233 can cool the outer side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slot 215, thereby further improving the heat dissipation efficiency of the motor.

[0196] Since the position with the highest temperature of the stator assembly 2 is generally at the position of the stator tooth slot 215, and the existing cooling scheme often cannot directly cool this position, but only cools the outside of the stator assembly 2 to indirectly take away part of the heat at the position of the stator tooth slot 215. The present scheme utilizes the second cooling oil channel 234 to directly pass the cooling oil into the position of the stator tooth slot 215, so that the inner side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slot 215 at this position can be cooled, thereby significantly improving the heat dissipation efficiency of the motor.

[0197] In this way, the two axial ends, the outer side and the inner side of the stator core 21 can be cooled at the same time, as shown in Figure 3 and Figure 46 , the heat dissipation capacity of the stator core 21 is greatly improved. Moreover, the outer and inner parts of the end winding 221 of the stator coil 22 and the part of the stator coil 22 located in the stator tooth slot 215 can all exchange heat with the cooling oil, greatly improving the heat dissipation capacity of the stator coil 22. As a result, the heat dissipation efficiency of the motor is also greatly improved, and the heat generation requirement can be met, so the rotor assembly 3 does not need to assist the stator assembly 2 in heat dissipation by means of oil throwing, thereby avoiding the generation of oil stirring loss.

[0198] In an exemplary embodiment, as shown in Figure 27 , Figure 28 , Figure 29 and Figure 31 , the two ends of the radial outer wall of the stator slot wedge 23 are respectively provided with a first notch 231 and a second notch 232 communicating with the second cooling oil channel 234, the first notch 231 is arranged to communicate with the cooling cavity 13 located at the oil inlet 1111 side, and the second notch 232 is arranged to communicate with the cooling cavity 13 located at the oil outlet 1121 side. Since the two stator end plates (the first stator end plate 211 and the second stator end plate 212) are in contact with the core body 213, the notches are arranged to enable the cooling oil in the cooling cavity 13 to enter the second cooling oil channel 234.

[0199] Alternatively, as shown in Figure 32 , Figure 33 andFigure 35 As shown, the radially outer wall of the stator slot wedge 23 is provided with a third gap 233 penetrating through both ends of the stator slot wedge 23, the third gap 233 is arranged to communicate the cooling cavity 13 on the oil inlet 1111 side and the cooling cavity 13 on the oil outlet 1121 side, and further communicate the oil inlet 1111 and the oil outlet 1121 of the motor.

[0200] The first gap 231 is arranged at the position of the stator slot wedge 23 corresponding to the axial first end of the stator core 21, which ensures that the cooling oil flowing through the winding 221 on this side end can enter the second cooling oil channel 234 through the first gap 231. The second gap 232 is arranged at the position of the stator slot wedge 23 corresponding to the axial second end of the stator core 21, which ensures that the cooling oil in the second cooling oil channel 234 can flow out through the winding 221 on this side end, and further flow out through the oil outlet 1121.

[0201] Alternatively, the stator slot wedge 23 can also adopt a completely penetrating structure, which is equivalent to connecting the first gap 231 and the second gap 232 in the above-mentioned scheme to form the third gap 233, so that the cooling oil in the second cooling oil channel 234 can be ensured to enter and exit.

[0202] Of course, the stator core 21 can also not include the stator slot wedge 23, and the radially inner end of the stator tooth slot 215 can also adopt a closed structure.

[0203] In an exemplary embodiment, the stator tooth slot 215 is provided with a stop shoulder 2151 for stopping the stator slot wedge 23, as shown in Figure 25 and Figure 26 The stop shoulder 2151 can play a positioning and limiting role on the stator slot wedge 23, facilitating the quick and accurate installation of the stator slot wedge 23 in place.

[0204] In an exemplary embodiment, the processing process of the stator core 21 is as follows: first, after the stator punching sheet is punched, the core body 213 is formed by stacking and welding. Then, the stator slot wedge 23 is uniformly installed. Then, glue is brushed on one side of the first stator end plate 211 provided with the oil inlet flow channel 2113 and one side of the second stator end plate 212 provided with the oil outlet flow channel 2123, and then the side of the first stator end plate 211 brushed with glue is tightly pressed on the front end of the core body 213, and the side of the second stator end plate 212 brushed with glue is tightly pressed on the rear end of the core body 213. Finally, the stator sleeve 214 is assembled.

[0205] As shown in Figure 16 The present application also provides a stator assembly 2, which comprises the stator core 21 and the stator coil 22 according to any one of the above-mentioned embodiments. The stator coil 22 is fixed to the stator core 21.

[0206] The stator assembly 2 provided by the embodiments of the present application includes the stator core 21 in any one of the above embodiments, and thus has all the beneficial effects of any one of the above embodiments, which will not be elaborated herein.

[0207] The embodiments of the present application also provide a power assembly, which includes the motor in any one of the above embodiments, and thus has all the beneficial effects of any one of the above embodiments, which will not be elaborated herein.

[0208] In an exemplary embodiment, the power assembly further includes structures such as an oil pump 5 and an oil cooler 6, as Figure 47 shown.

[0209] After the cooling oil cools the rotor assembly 3 and the stator assembly 2 of the motor through the oil pump 5, it flows through the pipeline to the oil cooler 6, and after being cooled by the oil cooler 6, it returns to the oil pump 5 again to realize the oil circuit circulation.

[0210] In an exemplary embodiment, a water cooling channel 1112 is provided in the motor housing 111. The power assembly further includes structures such as a motor controller 4, a water pump 7, and a water cooler 8, as Figure 48 shown.

[0211] The water pump 7 injects low-temperature cooling water into the motor controller 4. After cooling the motor controller 4, it enters the water cooling channel 1112 of the motor housing 111 to cool the stator assembly 2. The high-temperature cooling water flowing out of the housing 111 enters the water cooler 8 for cooling, and the cooled low-temperature cooling water then enters the water pump 7 to realize the water circuit circulation.

[0212] As Figure 49 shown, the embodiments of the present application also provide a vehicle 100, which includes wheels, a transmission device, and the motor in any one of the above embodiments, and thus has all the beneficial effects of any one of the above embodiments, which will not be elaborated herein.

[0213] In one example, the motor can be, but is not limited to: a drive motor, a generator, or an auxiliary drive motor.

[0214] In one example, the motor can drive the wheels to rotate through a transmission device.

[0215] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "perimeter", "the structure of the character 'kou'", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0216] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0217] Although the embodiments of the present application are disclosed as above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present application, and is not intended to limit the present application. Any modification and change in the form and details can be made by any person skilled in the art without departing from the spirit and scope of the present application disclosed, but the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A stator assembly characterized by, Comprise: a stator core and a stator coil fixed to the stator core; the stator core is provided with an oil inlet flow channel, a first cooling oil channel and an oil outlet flow channel which are sequentially communicated, the oil inlet flow channel is arranged at an axial first end portion of the stator core, the oil outlet flow channel is arranged at an axial second end portion of the stator core, and the first cooling oil channel is arranged at a side portion of the stator core; the stator core comprises a core body and a stator sleeve, the stator sleeve is sleeved outside the core body, and the stator sleeve is provided with the first cooling oil channel; the stator core further comprises a stator slot wedge, and the stator slot wedge is provided with a second cooling oil channel extending along the axial direction of the stator core; the axial first end portion of the stator core is provided with a second oil inlet hole corresponding to the radial middle portion of the stator tooth of the stator core, the second oil inlet hole is communicated with the oil inlet flow channel, the second oil inlet hole is opposite to the middle position of the end winding of the stator coil on one side, the end winding on one side is immersed in the cooling oil, and the cooling oil flowing through the middle position of the end winding on one side into the second oil inlet hole cools the inside of the end winding on one side; the axial second end portion of the stator core is provided with a second oil outlet hole corresponding to the radial middle portion of the stator tooth of the stator core, and the second oil outlet hole is communicated with the oil outlet flow channel; the second oil outlet hole is opposite to the middle position of the end winding of the stator coil on one side, the end winding on one side is immersed in the cooling oil, and the cooling oil flowing out of the second cooling oil channel can flow to the second oil outlet hole through the oil outlet flow channel, thereby cooling the inside of the end winding on one side.

2. The stator assembly according to claim 1, wherein: the oil inlet flow channel extends along the radial direction of the stator core, and the radial outer end of the oil inlet flow channel is communicated with the first cooling oil channel; and / or the oil outlet flow channel extends along the radial direction of the stator core, and the radial outer end of the oil outlet flow channel is communicated with the first cooling oil channel.

3. The stator assembly of claim 1, wherein, The first cooling oil channel is arranged in any one of the following forms or a combination of any multiple thereof: the first cooling oil channel extends along the circumferential direction and the axial direction of the stator core in a spiral shape; or the first cooling oil channel extends along the axial direction of the stator core in a straight line shape; or the first cooling oil channel comprises a plurality of annular oil channels extending along the circumferential direction of the stator core and a gap oil channel located between and communicated with two adjacent annular oil channels; or the first cooling oil channel is in a mesh shape.

4. The stator assembly according to claim 1, wherein: the oil inlet flow channel is located inside the stator core, the axial first end portion of the stator core is provided with a first oil inlet hole, the inlet of the first oil inlet hole penetrates the end face of the axial first end portion of the stator core, and the outlet of the first oil inlet hole is communicated with the oil inlet flow channel; and / or The oil outlet channel is located inside the stator core, an axial second end of the stator core is provided with a first oil outlet hole, an inlet of the first oil outlet hole is communicated with the oil outlet channel, and an outlet of the first oil outlet hole penetrates an end face of the axial second end of the stator core.

5. The stator assembly of any one of claims 1-4, wherein, The stator core further comprises: A first stator end plate is connected to an axial first end of the core body, and the first stator end plate forms an axial first end of the stator core. A second stator end plate is connected to an axial second end of the core body, and the second stator end plate forms an axial second end of the stator core.

6. The stator assembly according to claim 5, wherein The inner side wall of the stator sleeve and / or the outer side wall of the stator sleeve is provided with the first cooling oil channel.

7. The stator assembly according to claim 6, wherein The stator sleeve is a roll-formed integrated structure or a die-cast integrated structure.

8. The stator assembly of claim 5, wherein, The stator core is provided with a stator tooth slot, and a radially inner end of the stator tooth slot is open. The stator slot wedge is fixed at the radially inner end of the stator tooth slot, and the stator slot wedge is a heat-conducting member.

9. The stator assembly according to claim 8, wherein The radially outer side wall of the stator slot wedge is provided with a first notch and a second notch at two ends thereof, the first notch is arranged to be communicated with the cooling cavity on the oil inlet side, and the second notch is arranged to be communicated with the cooling cavity on the oil outlet side; or The radially outer side wall of the stator slot wedge is provided with a third notch penetrating two ends of the stator slot wedge, and the third notch is arranged to be communicated with the cooling cavity on the oil inlet side and the cooling cavity on the oil outlet side.

10. The stator assembly according to claim 8, wherein The stator slot wedge is made of a flexible material to seal the radially inner end of the stator tooth slot.

11. An electric machine characterized by The stator assembly according to claim 1 is included.

12. A powertrain, characterized by, The motor, the oil pump and the oil cooler according to claim 11 are included, the oil pump is arranged to provide circulating power for the cooling oil flowing through the stator assembly, the cooling oil passing through the stator assembly enters the oil cooler and is cooled by the oil cooler.

13. A vehicle characterized by comprising: The power assembly according to claim 12 is included.

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