Slip ring, sealing assembly, stator, electric motor, electric assembly, and vehicle

Abstract

A slip ring, a sealing assembly, a stator, an electric motor, an electric assembly, and a vehicle. The slip ring is provided with a first cavity and a second cavity which are axially disposed spaced apart from each other; and the slip ring comprises a partition plate for separating the first cavity and the second cavity, wherein a first communication port that connects the first cavity and the second cavity is formed in the partition plate and used for guiding a cooling liquid in the second cavity into the first cavity, and the first cavity is used for accommodating windings of an electric motor.

Description

Busbar, sealing assembly, stator, motor, electric assembly and vehicle

[0001] This application claims priority to Chinese patent applications No. 202410709548.7, 202410705762.5, 202410709150.3, 202410710697.5, 202410705423.7, 202410710312.5, 202421237751.0, 202421249397.3, filed on May 31, 2024 with the China Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of motor cooling, in particular to a busbar, a sealing assembly, a stator, a motor, an electric assembly and a vehicle. BACKGROUND

[0003] The oil collecting cover usually adopts a radial double-layer mechanism, that is, radially having two cavities, the outer cavity is communicated with the stator oil channel, and radial spray holes are arranged on the inner wall of the outer cavity, so that the cooling liquid enters the inner cavity from the spray holes to cool and lower the temperature of the winding end inserted into the inner cavity, and is communicated with the oil channel in the stator core to uniformly cool the entire stator assembly. In the same installation space, the radial space of the inner cavity is limited by the radial arrangement of the two cavities, which is not suitable for the case of multi-layer winding. SUMMARY

[0004] The present application provides a busbar, a sealing assembly, a stator, a motor, an electric assembly and a vehicle suitable for cooling of a multi-layer winding structure.

[0005] In a first aspect, the present application provides a busbar, the busbar having a first cavity and a second cavity arranged axially spaced apart, the busbar comprising a partition plate separating the first cavity and the second cavity, the partition plate being provided with a first communication opening communicating the first cavity and the second cavity and being used for guiding the cooling liquid in the second cavity into the first cavity; the first cavity being used for accommodating the winding of the motor.

[0006] In a second aspect, the present application provides a sealing assembly, comprising:

[0007] The busbar comprises a first through hole and oppositely arranged inner and outer side walls, the first through hole penetrating the inner and outer side walls, and the inner side wall surrounding a busbar space for accommodating the winding;

[0008] The wire sleeve is filled in the first through hole and is used for preventing the cooling liquid in the busbar space from flowing out through the first through hole, and the wire sleeve is provided with a wire passing hole;

[0009] A sealing cover is arranged at a port of the first through hole away from the current collection space to limit the wire sleeve in the first through hole. The sealing cover is provided with a second through hole. The wire passing hole communicates the current collection space and the second through hole to allow the lead wire on the winding to pass out of the current collection space through the wire passing hole and the second through hole.

[0010] In a third aspect, the embodiments of the present application provide a stator, comprising:

[0011] A stator core has a stator slot.

[0012] An insulation sleeve is inserted into the stator slot.

[0013] A second sealing strip is integrally arranged with the insulation sleeve. The second sealing strip and the insulation sleeve surround a mounting hole. The mounting hole extends along the axial direction of the stator core and is located in the stator slot. The second sealing strip seals the slot opening of the stator slot.

[0014] A winding is inserted into the mounting hole.

[0015] In a fourth aspect, the embodiments of the present application provide an electric machine, comprising:

[0016] A stator is formed with a stator slot.

[0017] A winding is arranged in the stator slot; and

[0018] A current collection ring is arranged on one side of the stator along the axial direction. A current collection space is formed between the current collection ring and the stator. The end surfaces of the current collection ring and the stator are sealingly connected to seal the current collection space.

[0019] In a fifth aspect, the embodiments of the present application provide an electric drive assembly, comprising the electric machine as described above, which comprises:

[0020] A stator is formed with a stator slot.

[0021] A winding is arranged in the stator slot; and

[0022] A current collection ring is arranged on one side of the stator along the axial direction. A current collection space is formed between the current collection ring and the stator. The end surfaces of the current collection ring and the stator are sealingly connected to seal the current collection space.

[0023] In a sixth aspect, the embodiments of the present application provide a vehicle, comprising the electric machine as described above or the electric drive assembly as described above.

[0024] In the current application, the inside of the ring is divided into a first cavity and a second cavity by a partition plate, the partition plate is provided with a first communication port for communication between the first cavity and the second cavity. The cooling liquid in the second cavity enters the first cavity through the first communication port to cool the part of the winding and the axial end of the stator core. In the current application, the first cavity and the second cavity are double-layer cavities arranged along the axial direction of the ring, and the radial space of the first cavity is only limited by the internal space of the shell, so it can be applied to the application environment of multi-layer winding. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a schematic diagram of the flow path of the cooling liquid in the motor of an embodiment of the present application;

[0027] Fig. 2 is a schematic diagram of the flow path of the cooling liquid in the motor of another embodiment of the present application;

[0028] Fig. 3 is a schematic diagram of a structure of the ring in an example of the present application;

[0029] Fig. 4 is a schematic diagram of a structure of the ring in another example of the present application;

[0030] Fig. 5 is a schematic diagram of a structure of the ring in another example of the present application;

[0031] Fig. 6 is a schematic diagram of a structure of the outer ring part of an embodiment of the present application;

[0032] Fig. 7 is a schematic diagram of a connection structure of the connecting piece in the second embodiment;

[0033] Fig. 8 is a schematic diagram of another view of the connection structure of the connecting piece in Fig. 7;

[0034] Fig. 9 is a schematic diagram of another connection structure of the connecting piece in the second embodiment;

[0035] Fig. 10 is a schematic diagram of another connection structure of the connecting piece in the second embodiment;

[0036] Fig. 11 is a schematic diagram of the flow path of the cooling liquid in the motor of an embodiment of the present application;

[0037] Fig. 12 is a schematic diagram of a structure of the ring in the first embodiment of the present application;

[0038] Fig. 13 is a structural schematic diagram of the commutator from another perspective in Fig. 12;

[0039] Fig. 14 is a structural schematic diagram of the commutator in the second embodiment of the application;

[0040] Fig. 15 is another structural schematic diagram of the commutator in the second embodiment of the application;

[0041] Fig. 16 is yet another structural schematic diagram of the commutator in the second embodiment of the application;

[0042] Fig. 17 is a schematic diagram of the flow path of the cooling liquid in the motor of another embodiment of the application;

[0043] Fig. 18 is a schematic diagram of the flow path of the cooling liquid in the motor of yet another embodiment of the application;

[0044] Fig. 19 is a schematic diagram of the flow path of the cooling liquid in the motor of still another embodiment of the application;

[0045] Fig. 20 is a structural schematic diagram of the outer ring portion in an embodiment of the application;

[0046] Fig. 21 is a schematic diagram of a connection structure of the connecting member in the second embodiment;

[0047] Fig. 22 is a schematic diagram of the connection structure of the connecting member in Fig. 21 from another perspective;

[0048] Fig. 23 is a schematic diagram of another connection structure of the connecting member in the second embodiment;

[0049] Fig. 24 is a schematic diagram of yet another connection structure of the connecting member in the second embodiment;

[0050] Fig. 25 is a structural schematic diagram of the sealing assembly and the lead wire in an embodiment of the application;

[0051] Fig. 26 is a structural schematic diagram of the commutator in an embodiment of the application;

[0052] Fig. 27 is a structural schematic diagram of the sealing cover in an embodiment of the application;

[0053] Fig. 28 is a structural schematic diagram of the sealing cover in Fig. 27 from another perspective;

[0054] Fig. 29 is a structural schematic diagram of the wire sleeve in an embodiment of the application;

[0055] Fig. 30 is a structural schematic diagram of the commutator in another embodiment of the application;

[0056] Fig. 31 is a structural schematic diagram of the wire sleeve in another embodiment of the application;

[0057] Figure 32 is a partial structural sectional view of a stator according to an embodiment of the present application;

[0058] Figure 33 is a top view of a stator core, an insulating sleeve and a sealing strip according to an embodiment of the present application;

[0059] Figure 34 is a top view of a stator core, an insulating sleeve, a sealing strip and a stator winding according to an embodiment of the present application;

[0060] Figure 35 is a partial structural sectional view of a stator according to another embodiment of the present application;

[0061] Figure 36 is a perspective view of an insulating sleeve, a sealing strip, a first connecting ring and a second connecting ring according to an embodiment of the present application;

[0062] Figure 37 is a perspective view of a plurality of insulating sleeves, a plurality of sealing strips, a first connecting ring and a second connecting ring according to an embodiment of the present application;

[0063] Figure 38 is a structural schematic view of a sealing strip, a first connecting ring, a second connecting ring and a first bus ring according to a first embodiment of the present application;

[0064] Figure 39 is a structural schematic view of a sealing strip, a first connecting ring, a second connecting ring and a first bus ring according to a second embodiment of the present application;

[0065] Figure 40 is a structural schematic view of a sealing strip, a first connecting ring, a second connecting ring and a first bus ring according to a third embodiment of the present application;

[0066] Figure 41 is a structural schematic view of an embodiment of an electric machine provided by the present application;

[0067] Figure 42 is an assembly schematic view of a bus ring and a stator core in Figure 41;

[0068] Figure 43 is a structural schematic view of an embodiment of a stator core in Figure 41;

[0069] Figure 44 is a structural schematic view of another embodiment of a stator core in Figure 41;

[0070] Figure 45 is an enlarged view of A in Figure 42;

[0071] Figure 46 is a structural schematic view of an embodiment of a sealing structure of a bus ring and a stator in Figure 41;

[0072] Figure 47 is a perspective structural schematic view of an embodiment of a bus ring in Figure 41;

[0073] Figure 48 is a structural schematic view of a first embodiment of a sealing structure of a bus ring and a first sealing strip in Figure 41;

[0074] Fig. 49 is a structural schematic diagram of a second embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41;

[0075] Fig. 50 is a structural schematic diagram of a third embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41;

[0076] Fig. 51 is a structural schematic diagram of a first embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41 using a mortise and tenon structure;

[0077] Fig. 52 is a structural schematic diagram of a second embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41 using a mortise and tenon structure;

[0078] Fig. 53 is a structural schematic diagram of a third embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41 using a mortise and tenon structure;

[0079] Fig. 54 is a structural schematic diagram of a fourth embodiment of the sealing structure of the collector ring and the first sealing strip in Fig. 41 using a mortise and tenon structure;

[0080] Fig. 55 is a structural schematic diagram of the sealing member in Fig. 41;

[0081] Fig. 56 is an assembly schematic diagram of the sealing member and the stator core in Fig. 41;

[0082] Fig. 57 is an enlarged view of B in Fig. 56;

[0083] Fig. 58 is a structural schematic diagram of a first embodiment of the sealing structure of the collector ring and the sealing ring in Fig. 41;

[0084] Fig. 59 is a structural schematic diagram of a second embodiment of the sealing structure of the collector ring and the sealing ring in Fig. 41;

[0085] Fig. 60 is a structural schematic diagram of a third embodiment of the sealing structure of the collector ring and the sealing ring in Fig. 41;

[0086] Fig. 61 is a sectional view of an embodiment of the motor provided by the present application;

[0087] Fig. 62 is a structural schematic diagram of a second embodiment of the first outer flow channel in Fig. 61;

[0088] Fig. 63 is a structural schematic diagram of a third embodiment of the first outer flow channel in Fig. 61;

[0089] Fig. 64 is a position schematic diagram of the first outer flow channel and the inner flow channel at the first collector ring in Fig. 61;

[0090] Fig. 65 is a position schematic diagram of the inner flow channel and the second liquid outlet at the second collector ring in Fig. 61;

[0091] Fig. 66 is a flow schematic diagram of another embodiment of the cooling liquid in the inner flow channel in Fig. 61;

[0092] Fig. 67 is a schematic view of the flow of the coolant in the second outer flow channel in Fig. 61;

[0093] Fig. 68 is a schematic view of the stator core in Fig. 61;

[0094] Fig. 69 is a schematic view of another embodiment of the stator core in Fig. 61;

[0095] Fig. 70 is a schematic view of the flow of the coolant in the third outer flow channel in Fig. 61;

[0096] Fig. 71 is a sectional view of a first embodiment of the motor according to the present application;

[0097] Fig. 72 is a schematic view of an embodiment of the stator core in Fig. 71;

[0098] Fig. 73 is a schematic view of another embodiment of the stator core in Fig. 71;

[0099] Fig. 74 is a schematic view of the positions of the inlet and the second outer flow channel in the mounting cavity in Fig. 71;

[0100] Fig. 75 is a schematic view of the positions of the second outer flow channel and the first outlet in the first collector ring in Fig. 71;

[0101] Fig. 76 is a schematic view of the positions of the second outer flow channel and the second outlet in the second collector ring in Fig. 71;

[0102] Fig. 77 is a sectional view of a second embodiment of the motor in Fig. 71;

[0103] Fig. 78 is a sectional view of a third embodiment of the motor in Fig. 71;

[0104] Fig. 79 is a sectional view of a fourth embodiment of the motor in Fig. 71;

[0105] Fig. 80 is a sectional view of a motor according to an embodiment of the present application;

[0106] Fig. 81 is a schematic view of a collector ring according to an embodiment of the present application;

[0107] Fig. 82 is a sectional view of the collector ring according to an embodiment of the present application;

[0108] Fig. 83 is a schematic view of the collector ring according to an embodiment of the present application from another perspective;

[0109] Fig. 84 is a side view of a motor according to an embodiment of the present application;

[0110] Fig. 85 is a side view of a vehicle according to an embodiment of the present application.

[0111] Reference signs: 100, motor; 1, housing; 10, stator; 11, mounting cavity; 12, liquid inlet; 2, stator core; 111, stator slot; 3, winding; 31, first winding part; 32, second winding part; 4, first bus ring; 41, first bus space; 42, first liquid outlet; 5, second bus ring; 51, second bus space; 52, second liquid outlet; 6, inner flow channel; 7, first outer flow channel; 70, outer flow channel; 611, first recess; 613, first protruding ring; 614, second protruding ring; 8, second outer flow channel; 81, protrusion; 811, first protrusion; 812, second protrusion; 9, third outer flow channel; 112, opening; 120, sealing element; 121, first sealing strip; 1211, third protrusion; 122, sealing ring; 30, bus ring; 301, bus space; 312, contact surface; 321, second recess; 33, protruding part; 331, fourth protrusion; 34, annular protrusion; 35, tenon part; 36, recessed part; 40, first sealing ring; 1111, first cavity; 1112, second cavity; 113, inlet; 1114, first communication port; 115, outlet; 12a, inner ring part; 121a, first inner ring part; 122a, second inner ring part; 13, outer ring part; 131, first outer ring part; 132, second outer ring part; 14, end plate; 15, partition plate; 151, first ring part; 152, second ring part; 20, connecting piece; 21, hollow channel; 110, stator yoke part; 120a, stator tooth part; 121b, tooth root part; 122b, stop part; 131a, slot opening; 141, first abutment surface; 142, second abutment surface; 200, insulation sleeve; 210, first insulation part; 220, second insulation part; 230, third insulation part; 300, second sealing strip; 310, mounting hole; 511, first protruding edge; 512, third recess; 513, second protruding edge; 550, cooling flow channel; 600, second sealing ring; 610, first sealing ring; 620, second sealing ring; 710, first connecting ring; 720, second connecting ring; 721, fourth recess; 110a, first through hole; 111a, seventh protrusion; 120b, inner side wall; 130, outer side wall; 131b, first region; 132a, second region; 140, mounting surface; 141a, first thread; 200a, wire sleeve; 210a, wire passage hole; 220a, wire sleeve body; 230a, fifth protrusion; 300a, sealing cover; 310a, second through hole; 311, sixth protrusion; 312a, second thread; 400, lead wire; 120c, third channel; 211, lug; 310b, rotor core; 320, rotating shaft; 330, bearing; 331a, inner ring; 332, outer ring; 333, rolling element; 334, gap; 420, first liquid outlet hole; 430, flow guide channel; 440, annular protrusion; 450, first annular plate; 451, second liquid outlet hole; 460, second annular plate; 461, fourth protruding edge;470, third annular plate; 471, first side wall; 472, second side wall; 473, wire passage hole; 480, inlet; 500, bearing seat; 510, second passage; 620, third convex edge; 700, third sealing ring; 113a, third port; 116, second port; electric assembly 800; vehicle 900; 920, wheel; 910, vehicle body. DETAILED DESCRIPTION

[0112] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0113] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intervening component.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes a combination of one or more of the associated listed items.

[0115] Some embodiments of the present application will be described in detail below with reference to the drawings. The following examples and features in the examples can be combined with each other without conflict.

[0116] The present application provides a vehicle 900. As shown in FIG. 85, the vehicle 900 includes an electric assembly 800, which is an important component in an electric vehicle or a hybrid vehicle, integrating a plurality of components related to electric energy conversion, transmission and use. The motor, as one of the important components of the electric assembly 800, can convert electric energy into mechanical energy to provide power for the vehicle 900 to travel.

[0117] The electric assembly 800 usually further includes a battery pack, a battery management system (BMS), a controller (such as a motor controller and a vehicle controller), a transmission device (such as a reducer or a gearbox), and other related electrical and mechanical components. The present application does not make a detailed description of this.

[0118] Please refer to Fig. 1 and Fig. 2, the motor 100 comprises a stator core 2 and a bus ring 30, the bus ring 30 is arranged at the end of the stator core 2 along the axial direction, and the bus ring 30 is used for cooling the motor 100.

[0119] It can be understood that the motor 100 further comprises a necessary or unnecessary shell 1, a winding 3, a rotor and a lead-out wire; the stator core 2 comprises a stator yoke and a plurality of stator teeth, the stator teeth are arranged protruding from the inner wall of the stator yoke, tooth slots are formed between adjacent stator teeth, and the plurality of tooth slots are arranged spaced apart along the circumferential direction of the inner wall of the stator yoke; part of the winding 3 is located in the tooth slot, and the winding 3 is exposed at both ends of the stator core 2 along the axial direction. The stator core 2 and the bus ring 30 are fixed in the shell 1, the outer wall of the stator yoke is provided with an outer flow channel 70, the shell 1 is provided with an inlet 12, one end of the outer flow channel 70 is in communication with the inlet 12, and the other end of the outer flow channel 70 is in communication with the inner cavity of the bus ring 30. The rotor is arranged in the stator core 2, and in the operation process of the motor 100, the winding 3 is electrified to drive the rotor to rotate, and the winding 3 is the main heat source. The cooling liquid sprays or soaks the winding 3 through the inlet 12, the outer flow channel 70 and the bus ring 30.

[0120] The lead-out wire comprises three-phase lead-out wires of the motor 100 and a thermocouple wire, the lead-out wire needs to be led out from the bus ring 30, and the part of the lead-out wire needs to be sealed to avoid leakage of the cooling liquid.

[0121] Please refer to Fig. 3 to Fig. 5, in an embodiment, the bus ring 30 comprises a first part, a second part and a partition plate 15, the first part and the second part are connected to both sides of the partition plate 15 along the axial direction of the bus ring 30, and a first cavity 1111 is formed between the first part and the partition plate 15. The first part is provided with an opening opposite to the partition plate 15, the winding 3 passes through the opening and extends into the first cavity 1111; a second cavity 1112 is formed between the second part and the partition plate 15, an inlet 113 is arranged on the second part, and the inlet 113 is in communication with the outer flow channel 70 on the stator core 2; the partition plate 15 is provided with a first communication port 1114 in communication with the second cavity 1112 and the first cavity 1111, the cooling liquid enters the second cavity 1112 through the outer flow channel 70 and the inlet 113, and the cooling liquid in the second cavity 1112 enters the first cavity 1111 from the first communication port 1114, so as to cool the winding 3 in the first cavity 1111.

[0122] The axial direction of the bus ring 30 is the X direction in Fig. 1, the radial direction of the bus ring 30 is the Y direction in Fig. 1, and the axial direction and the radial direction in the following are taken as references.

[0123] It can be understood that the first part and the second part are only distinguished for the convenience of description. In actual application, the current collecting ring 30 can be a whole structure, the inside of the current collecting ring 30 is separated into the first cavity 1111 and the second cavity 1112 which are spaced in the axial direction by the partition plate 15 (axial double-layer structure), the first communication port 1114 which communicates the first cavity 1111 and the second cavity 1112 is formed on the partition plate 15, in the embodiment, the first cavity 1111 and the second cavity 1112 which are arranged in the axial direction are formed in the current collecting ring 30, the cooling liquid in the second cavity 1112 enters the first cavity 1111 through the first communication port, and the part of the winding 3 which extends into the first cavity 1111 and the axial end of the stator core 2 are cooled and cooled down. Since the radial outside of the first cavity 1111 is not blocked by other objects, the radial space of the first cavity 1111 is only limited by the size of the internal space of the shell 1, and can be applied to the application environment of the multi-layer winding 3.

[0124] The current collecting ring 30 has an inlet 113 which communicates with the second cavity 1112, and the cooling liquid enters the second cavity 1112 through the inlet 113. The cooling liquid first enters the second cavity 1112 for buffering, and then enters the first cavity 1111 through the first communication port 1114, which can slow down the flow rate of the cooling liquid entering the first cavity 1111, so as to improve the cooling efficiency of the winding 3.

[0125] In addition, the second cavity 1112 supplies the cooling liquid to the first cavity 1111 through the first communication port 1114, the first cavity 1111 is not directly communicated with the outer flow channel 70 of the stator core 2, the pressure loss in the second cavity 1112 is small, the speed of the cooling liquid entering the first cavity 1111 is fast, the disturbance effect of the cooling liquid can be enhanced, and the convective heat transfer of the winding 3 and the stator core 2 can be enhanced.

[0126] The current collecting ring 30 also has an opening which communicates with the first cavity 1111, and the winding 3 extends into the first cavity 1111 from the opening. It can be understood that the edge of the opening can be sealed with the end surface of the stator core 2 to prevent the cooling liquid in the first cavity 1111 from leaking. The sealing form between the current collecting ring 30 and the stator core 2 is not limited in the application.

[0127] The current collecting ring 30 can include an inner ring part 12a, an outer ring part 13, a partition plate 15 and an end plate 14, the inner ring part 12a and the outer ring part 13 are annular structures, the outer ring part 13 is arranged at the radial outside of the inner ring part 12a, the inner edge of the partition plate 15 is connected with the inner ring part 12a, and the outer edge of the partition plate 15 is connected with the outer ring part 13, so as to separate the first cavity 1111 and the second cavity 1112; the inner ring part 12a is separated into a first inner ring part 121a and a second inner ring part 122a by the partition plate 15 as a boundary, and the outer ring part 13 is separated into a first outer ring part 131 and a second outer ring part 132 by the partition plate 15 as a boundary.

[0128] In the first example of the embodiment, as shown in FIGS. 3-5, the first part includes the first inner ring portion 121a and the first outer ring portion 131, the first cavity 1111 is surrounded by the first inner ring portion 121a, the first outer ring portion 131 and the partition plate 15, and an opening is formed between the first inner ring portion 121a and the first outer ring portion 131. Since there is no other component to block, the radial distance between the second inner ring portion 122a and the first inner ring portion 121a is the radial dimension of the first cavity 1111, and the space between the second inner ring portion 122a and the first inner ring portion 121a is fully utilized, which is conducive to the multi-layer winding 3 extending into the first cavity 1111 from the opening.

[0129] The diameter of the first outer ring portion 131 can be smaller than the outer diameter of the end plate 14, in which case a passage is formed between the first outer ring portion 131 and the shell 1, and according to the oil inlet mode of the second cavity 1112 in the second part, the coolant can enter the second cavity 1112 through the passage between the first outer ring portion 131 and the shell 1, or an oil passage can be provided on the shell 1 to communicate with the second cavity 1112.

[0130] The diameter of the first outer ring portion 131 can be equal to the outer diameter of the end plate 14, and the end plate 14 and the first outer ring portion 131 are in contact with the inner wall surface of the shell 1, which can increase the contact area and improve the stability of the commutator ring 30 installed in the shell 1. In this case, the side of the first outer ring portion 131 away from the first inner ring portion 121a forms an axial liquid passage, the liquid passage is not directly communicated with the first cavity 1111, one end of the liquid passage is communicated with the second cavity 1112, and the end of the liquid passage away from the second cavity forms an inlet 113, which is communicated with the outer flow channel 70 on the stator core 2. By communicating the second cavity 1112 and the outer flow channel 70 on the stator core 2 through the liquid passage, the inner wall surface of the first outer ring portion 131 and the shell 1 can maintain a large contact area, which improves the stability of the commutator ring 30 installed in the shell 1. In other embodiments, an oil passage can also be provided on the shell 1 to communicate with the second cavity 1112.

[0131] In the second example of the embodiment, as shown in FIGS. 3 and 4, the second part includes the end plate 14, the second inner ring portion 122a and the second outer ring portion 132, the end plate 14 and the partition plate 15 are arranged axially spaced apart, the second outer ring portion 132 is arranged radially outward of the second inner ring portion 122a, and the second outer ring portion 132 and the second inner ring portion 122a are both connected between the end plate 14 and the partition plate 15.

[0132] The diameter of the second outer ring portion 132 can be smaller than the outer diameter of the end plate 14, as shown in FIG. 3, and the second cavity 1112 is surrounded by the end plate 14, the second inner ring portion 122a, the second outer ring portion 132, and the partition plate 15, and the inlet 113 is formed on the second outer ring portion 132. The outer edge of the end plate 14 is in abutment and sealed with the inner wall of the housing 1. Since the diameter of the second outer ring portion 132 is smaller than the outer diameter of the end plate 14, i.e., there is a gap between the second outer ring portion 132 and the inner wall of the housing 1, which can be used for the flow of the cooling liquid. By forming the inlet 113 on the second outer ring portion 132, the cooling liquid can flow into the second cavity 1112 from the inlet 113.

[0133] The diameter of the second outer ring portion 132 can be the same as the outer diameter of the end plate 14, as shown in FIG. 4, i.e., the second outer ring portion 132 is connected to the outer edge of the end plate 14, and the end plate 14 and the second outer ring portion 132 are both in contact with the inner wall of the housing 1, which can increase the contact area of the commutator ring 30 with the housing 1 and improve the stability of the installation of the commutator ring 30 in the housing 1. In this case, the second cavity 1112 is surrounded by the end plate 14, the second inner ring portion 122a, the second outer ring portion 132, and the partition plate 15, and the inlet 113 can be formed on the second outer ring portion 132, and the oil passage can be provided on the housing 1 to connect the outer flow channel 70 on the stator core 2 and the inlet 113. Alternatively, the inlet 113 can be formed on the partition plate 15, and the inlet 113 is located at the periphery of the first outer ring portion 131. It can be understood that the diameter of the first outer ring portion 131 needs to be smaller than the outer diameter of the end plate 14, and the cooling liquid flows through the channel formed between the first outer ring portion 131 and the inner wall of the housing 1 and then enters the second cavity 1112 through the inlet 113.

[0134] In the third example of the present embodiment, as shown in FIG. 5, the second portion includes the end plate 14 and the second inner ring portion 122a, and the third example is different from the second example in that it does not have the second outer ring portion 132, and the second cavity 1112 is surrounded by the end plate 14, the partition plate 15, the second inner ring portion 122a, and the inner wall of the housing 1. In this case, the oil passage can be directly provided on the housing 1 to connect the second cavity 1112 and the outer flow channel 70 on the stator core 2.

[0135] When the outer diameter of the partition plate 15 is smaller than the outer diameter of the end plate 14, the inlet 113 is formed between the edges of the partition plate 15 and the end plate 14. When the outer diameter of the partition plate 15 is equal to the outer diameter of the end plate 14, the inlet 113 is formed on the partition plate 15.

[0136] It can be understood that the first example and the second example can be combined with each other without conflict, and the first example and the third example can also be combined with each other, which is not limited in the present application.

[0137] Whether the first example and the second example are combined, or the first example and the third example are combined, the collector ring 30 has a first inner ring and a second inner ring, and according to the size relationship between the first inner ring and the second inner ring, the outlet 115 can be arranged at different positions.

[0138] Specifically, when the first inner ring portion 121a and the second inner ring portion 122a are flush, the first inner ring portion 121a and the second inner ring portion 122a can be regarded as a whole, and at this time, the outlet 115 can be arranged on the first inner ring portion 121a, and at this time, the cooling liquid enters the first cavity 1111 from the first communication port 1114 on the partition plate 15 along the axial direction, and after heat exchange with the end portion of the winding 3 and the stator core 2, the cooling liquid flows out from the first inner ring portion 121a along the radial direction. Compared with the radial inlet and outlet, the flow path of the cooling liquid can be increased, and the cooling liquid forms a turbulent flow in the first cavity 1111, which is beneficial to contact and heat exchange with the winding 3 and the stator core 2.

[0139] When the diameter of the second inner ring portion 122a is smaller than the diameter of the first inner ring portion 121a, the inner ring portion 12a is a stepped structure, the inner edge of the partition plate 15 is connected with the first outer ring portion 131, and part of the partition plate 15 is located between the first inner ring portion 121a and the second inner ring portion 122a. In this case, the outlet 115 can be arranged on the first inner ring portion 121a, which has the same effect as when the first inner ring portion 121a and the second inner ring portion 122a are flush. The outlet 115 can also be arranged on the partition plate 15 and located between the first inner ring portion 121a and the second inner ring portion 122a. As shown in FIG. 1, the partition plate 15 includes a first ring portion 151 and a second ring portion 152, the outer edge of the first ring portion 151 is connected with the second inner ring portion 122a, and the inner edge of the first ring portion 151 is connected with the first inner ring portion 121a; the outer edge of the second ring portion 152 is connected with the second outer ring portion 132, and the inner edge of the second ring portion 152 is connected with the second inner ring portion 122a; and the first ring portion 151 is provided with the outlet 115 which is in communication with the first cavity 1111. Thus, the cooling liquid in the first cavity 1111 flows out from the outlet 115 along the axial direction, and the flow direction of the cooling liquid flowing out from the outlet 115 is towards the end cover of the housing 1, rather than directly splashing on the rotor, which can reduce the influence on the movement of the rotor.

[0140] The second outer ring portion 132 can be a complete annular structure, that is, in a cross section perpendicular to the central axis of the busbar ring 30, the second outer ring portion 132 is annular. When there is no other component arranged on the inner wall of the shell 1, the second outer ring portion 132 can be annular, so that the second outer ring portion 132 matches the cross-sectional shape of the shell 1, thereby keeping the second outer ring portion 132 in close contact with the inner wall of the shell 1 or forming an equal-diameter gap. The second outer ring portion 132 can be formed by connecting more than two annular rings with different diameters, as shown in FIG. 6, the second outer ring portion 132 includes at least two arc segments connected end to end and having different diameters. When there is another component arranged on the inner wall of the shell 1, the second outer ring portion 132 is formed by connecting more than two annular rings with different diameters, thereby avoiding the component on the inner wall of the shell 1, which can facilitate welding to fill the gap between the shell 1 and the second outer ring portion 132.

[0141] Similarly to the second outer ring portion 132, the first outer ring portion 131 can be a complete annular structure, or formed by connecting more than two annular rings with different diameters. That is, in a cross section perpendicular to the central axis of the busbar ring 30, the first outer ring portion 131 is annular, or the first outer ring portion 131 includes at least two arc segments connected end to end and having different diameters. This will not be described in detail in the present application.

[0142] The first inner ring portion 121a and the second inner ring portion 122a can be arranged according to the shape of the first outer ring portion 131 and the second outer ring portion 132. The first inner ring portion 121a and the second inner ring portion 122a can also be a complete annular structure, or formed by connecting more than two annular rings with different diameters.

[0143] In some embodiments, referring to FIGS. 7-10, the busbar ring 30 further includes a connecting piece 20 having a hollow passage 21; the busbar ring 30 has multiple installation modes, regardless of which installation mode is used, the lead-out wire on the winding 3 passes through the hollow passage 21 and is sealed on the lead-out wire sleeve by a sealing member abutting against the inner wall of the hollow passage 21, thereby preventing the leakage of cooling liquid. Understandably, the size of the hollow passage 21 of the connecting piece 20 can be larger than the size of the lead-out wire, so that the lead-out wire can pass out, and the sealing can be filled and sealed.

[0144] Specifically, the connecting piece 20 can be connected with the end plate 14, the hollow passage 21 communicates with the second cavity 1112, and the partition plate 15 is provided with a wire passing hole corresponding to the hollow passage 21. As shown in FIGS. 7 and 8, the lead-out wire passes out of the wire passing hole and enters the hollow passage 21 after passing through the second cavity 1112. It needs to be clear that the present embodiment can set a sealing member between the lead-out wire and the edge of the wire passing hole, or can keep a gap between the lead-out wire and the wire passing hole for the cooling liquid to enter the second cavity from the first cavity.

[0145] The connecting piece 20 can be connected with the end plate 14 and the partition plate 15, and the hollow channel 21 is communicated with the first cavity 1111. As shown in FIG. 9, the connecting piece 20 and the end plate 14 are sealed, which can be achieved by using sealing glue, welding or other methods, and the lead-out wire directly passes through the hollow channel 21.

[0146] The connecting piece 20 can also be connected with the first outer ring part 131, and the hollow channel 21 is communicated with the first cavity 1111. As shown in FIG. 10, the connecting piece 20 and the first outer ring part 131 are sealed, which can be achieved by using sealing glue, welding or other methods, and the lead-out wire is directly passed through the hollow channel 21 after being bent.

[0147] It should be noted that the motor 100 in the present application is provided with the bus ring 30 at both ends of the stator core 2, and at least one bus ring 30 adopts the structure in the above-mentioned embodiment. That is to say, among the bus rings 30 at both ends of the stator core 2, one bus ring 30 adopts the axial double-layer structure, and the other bus ring 30 adopts one of the single-layer structure or the axial double-layer structure.

[0148] Please refer to FIGS. 11-13, the bus ring 30 is provided with the second cavity 1112 and the first cavity 1111 which are arranged at intervals, and a partition piece which separates the second cavity 1112 and the first cavity 1111, and the partition piece is provided with the first communication port 1114 which communicates the second cavity 1112 and the first cavity 1111, the cooling liquid in the second cavity 1112 enters the first cavity 1111 through the first communication port 1114, to realize the spray or immersion heat exchange of the winding 3 and the stator core 2, the cooling liquid after heat exchange can be discharged from the first cavity 1111 through the outlet 115, to reduce the pressure in the first cavity 1111, so that the cooling liquid in the second cavity 1112 can smoothly enter the first cavity 1111 through the first communication port 1114. Moreover, compared with the traditional oil discharge mode, the multiple outlets 115 in the present application can disturb the cooling liquid at different positions, so that the cooling liquid at the bottom of the bus ring 30 is discharged from the nearest outlet 115 in time, to improve the heat exchange effect and the heat exchange uniformity.

[0149] Among them, the bus ring 30 is provided with the third port 113a which communicates the second cavity 1112, or the bus ring 30 and the shell 1 surround the third port 113a which communicates the second cavity 1112. The cooling liquid enters the second cavity 1112 through the outer flow channel 70 on the stator core 2 and the third port 113a; the cooling liquid first enters the second cavity 1112 to buffer, and then enters the first cavity 1111 through the first communication port 1114, which can slow down the flow rate of the cooling liquid entering the first cavity 1111, to improve the cooling efficiency of the winding 3.

[0150] In this embodiment, the collector ring 30 has a hollow portion, and the plurality of outlets 115 are arranged at intervals around the hollow portion of the collector ring 30. Specifically, the plurality of outlets 115 are arranged at intervals along the circumferential direction of the collector ring 30. It can be understood that the distance between each outlet 115 and the central axis of the collector ring 30 can have a certain error.

[0151] The second cavity 1112 and the first cavity 1111 can be arranged at intervals in the radial direction of the collector ring 30 (radial double-layer structure), as shown in FIGS. 12 and 13. The second cavity 1112 and the first cavity 1111 can also be arranged at intervals in the axial direction of the collector ring 30 (axial double-layer structure), as shown in FIGS. 14 to 16. The position relationship between the second cavity 1112 and the first cavity 1111 is not limited in this application. Regardless of whether the collector ring 30 adopts the radial double-layer structure or the axial double-layer structure, the flow path of the cooling liquid is the outer flow channel 70 on the stator core 2-third port 113a-second cavity 1112-liquid passage-first cavity 1111-second port 116, as shown in FIGS. 11, 17 to 19.

[0152] The axial direction of the collector ring 30 is the X direction in FIG. 11, and the radial direction of the collector ring 30 is the Y direction in FIG. 11. Hereinafter, the axial direction and the radial direction are referred to in this way.

[0153] In some embodiments, the number of first communication ports 1114 is a plurality, and the plurality of first communication ports 1114 are configured to be able to enter the first cavity 1111 from the second cavity 1112 when the medium pressure in the second cavity 1112 is greater than a threshold value. That is, the first communication port 1114 is a throttle hole, which will only be opened and guide the cooling liquid into the first cavity 1111 when the internal and external pressure difference is large. In this way, after the second cavity 1112 is filled with a certain amount of cooling liquid, the cooling liquid is introduced into the first cavity 1111 from multiple positions through the plurality of first communication ports 1114, further improving the flowability of the cooling liquid in the first cavity 1111. The threshold value can be set according to actual needs, and the above functions can be realized.

[0154] In some embodiments, the plurality of first communication ports 1114 can be arranged in a circumferential distribution, and the second cavity 1112 and the first cavity 1111 can both be annular cavities.

[0155] In some embodiments, referring to FIGS. 11-13, the current ring 30 can simultaneously have an outlet 115 configured to discharge when the medium in the first cavity 1111 has a pressure greater than a first predetermined value, and a second port 116 configured to discharge when the medium in the first cavity 1111 reaches a predetermined height. In this embodiment, two types of outlets are provided, wherein the outlet 115 is used to discharge the coolant from multiple positions to disturb the coolant in the first cavity 1111, and the second port 116 is used to discharge the coolant when the first cavity 1111 is completely or substantially completely filled with the coolant, to ensure the flowability of the coolant.

[0156] The outlet 115 is a throttling hole that only opens and discharges coolant when the internal and external pressure difference is large, to ensure that the coolant can accumulate in the first cavity 1111 and immerse the stator winding 3. When the medium in the first cavity 1111 has a pressure greater than a first predetermined value, it indicates that the internal and external pressure difference of the outlet 115 has reached the opening condition of the outlet 115, at which time the coolant has accumulated a certain amount in the first cavity 1111 and needs to be discharged to ensure the flowability of the coolant. It should be noted that the cross-sectional area of the first communication port 1114 is greater than the sum of the cross-sectional areas of the plurality of outlets 115, i.e., the discharge rate of the outlet 115 needs to be lower than the rate at which the second cavity 1112 delivers coolant to the first cavity 1111 through the first communication port 1114, i.e., the coolant in the first cavity 1111 can continue to increase while the outlet 115 is discharging coolant, to ensure that the coolant can accumulate in the first cavity 1111 and immerse the stator winding 3. Specifically, the predetermined value can be set according to actual needs, to achieve the above functions.

[0157] Wherein, when the first cavity 1111 is completely or substantially completely filled with the coolant, the coolant liquid level reaches the second port 116 and can be discharged through the second port 116. As mentioned above, the outlet 115 can only disturb the coolant and cannot prevent the coolant from continuing to increase, so the second port 116 is also needed, such that the cross-sectional area of the second port 116 is greater than that of the first communication port 1114, to ensure that the coolant can be discharged to ensure the overall flowability of the coolant. Specifically, the predetermined height can be set according to actual needs, to achieve the above functions.

[0158] Specifically, to achieve the condition that the medium in the first cavity 1111 can be discharged through the outlet 115 when the pressure of the medium in the first cavity 1111 is greater than a predetermined value, and the medium in the first cavity 1111 can be discharged through the second port 116 when the medium in the first cavity 1111 reaches a predetermined height, in an optional embodiment, as shown in FIG. 12, the intersection of the outer edge of the collector ring 30 and the diameter passing through the second port 116 is a reference point O, the distance between the second port 116 and the reference point O is H, and the radial distance between the outlet 115 and the reference point O along the diameter passing through the second port 116 is h, where H > h. In this embodiment, the position of the outlet 115 is represented by the midpoint of the outlet 115, and the position of the second port 116 is represented by the lowest point of the second port 116 (the edge position close to the reference point O). In actual use, the second port 116 is arranged close to the top of the collector ring 30, and the position of the second port 116 is higher than that of the outlet 115. Based on the condition that a plurality of outlets 115 are arranged at intervals in the circumferential direction, the second port 116 can be arranged at the periphery of the outlet 115. In this case, the cooling liquid can accumulate in the first cavity 1111 until it flows out from the second port 116; when the lubricating oil liquid does not flow out from the second port 116 in time, the pressure in the first cavity 1111 is too high, and the lubricating oil liquid can flow out from the outlet 115, reducing the pressure in the first cavity 1111. That is, the second port 116 serves as the main first port for the cooling liquid, and the outlet 115 plays a supplementary role in discharging the oil, reducing the pressure in the first cavity 1111, so that the bottom cooling liquid is discharged in time, thereby improving the heat exchange effect and the heat exchange uniformity.

[0159] In some embodiments, referring to FIGS. 11-13, the collector ring 30 can simultaneously have an outlet 115 and a second port 116, the outlet 115 is configured to discharge the medium in the first cavity 1111 when the pressure of the medium in the first cavity 1111 is greater than a first predetermined value, and the second port 116 is configured to discharge the medium in the first cavity 1111 when the pressure of the medium in the first cavity 1111 is greater than a second predetermined value. In this embodiment, two types of outlets are provided, wherein the outlet 115 is used to discharge the cooling liquid from multiple positions to disturb the cooling liquid in the first cavity 1111, and the second port 116 is used to discharge the cooling liquid outward when the oil pressure of the cooling liquid in the first cavity 1111 rises to the second predetermined value, so as to ensure the flowability of the cooling liquid.

[0160] As mentioned above, the outlet 115 is a throttling hole, which is opened only when the pressure difference between the inside and outside is large enough to discharge the coolant, so that the coolant can accumulate in the first cavity 1111 and immerse the stator winding 3. Specifically, when the medium pressure in the first cavity 1111 is greater than a first predetermined value, it indicates that the pressure difference between the inside and outside of the outlet 115 reaches the opening condition of the outlet 115, at this time, the coolant has accumulated in the first cavity 1111 to a certain amount, which needs to be discharged to ensure the flowability of the coolant. The discharge rate of the outlet 115 needs to be lower than the rate at which the coolant is delivered from the second cavity 1112 to the first cavity 1111 through the first communication port 1114. While the outlet 115 discharges the coolant, the coolant in the first cavity 1111 can still continue to increase, and as the coolant in the first cavity 1111 increases, the oil pressure in the first cavity 1111 continues to rise. When the medium pressure in the first cavity 1111 is greater than a second predetermined value, it indicates that the pressure difference between the inside and outside of the second port 116 reaches the opening condition of the outlet 115. By setting the opening conditions of the outlet 115 and the second port 116 to be different, it is ensured that the coolant can be discharged to ensure the overall flowability of the coolant. Specifically, the first predetermined value and the second predetermined value can be set according to actual needs, and the first predetermined value is less than the second predetermined value, so as to achieve the above functions.

[0161] Specifically, to achieve the above functions, in an alternative embodiment, a pressure valve is arranged at the second port 116 to achieve the opening of the second port 116 when it reaches the second predetermined value. When the second port 116 is not opened, the cross-sectional area of the outlet 115 is less than that of the first communication port 1114, so that while the coolant in the first cavity 1111 is discharged from the outlet 115, the coolant in the first cavity 1111 can still continue to increase. When the oil pressure in the first cavity 1111 rises to the second predetermined value, the second port 116 is opened, and the sum of the areas of the outlet 115 and the second port 116 is greater than the area of the first communication port 1114, so that the coolant in the first cavity 1111 is discharged in time to ensure the overall flowability of the coolant. It should be noted that when the oil pressure in the first cavity 1111 rises to the second predetermined value, the coolant in the first cavity 1111 should be completely filled or substantially completely filled.

[0162] In addition, when the first communication port 1114 is provided with a plurality of first communication ports, the cross-sectional area of the second port 116 is greater than the sum of the cross-sectional areas of the plurality of first communication ports 1114, and the sum of the cross-sectional areas of the plurality of first communication ports 1114 is greater than the sum of the cross-sectional areas of the plurality of outlets 115.

[0163] The shape of the second port 116 can be a regular geometric shape such as a circle, a rectangle, a triangle, etc. The size of the second port 116 refers to the cross-sectional area of the second port 116, and the cross-sectional area of the second port 116 is greater than or equal to 15 mm 2 Even if there is no internal pressure in the first cavity 1111, as long as the cooling liquid accumulates to a liquid level above the lower edge of the second port 116, the oil can be smoothly discharged. The shape of the outlet 115 can be a regular geometric shape such as a circle, a rectangle, a triangle, etc. The size of the outlet 115 refers to the cross-sectional area of the outlet 115, and the cross-sectional area of the outlet 115 is 0.7 mm 2 to 13 mm 2 Thus, the total flow rate of all outlets 115 is 0 or lower than the inlet flow rate of the first cavity 1111, so that the cooling liquid accumulates in the first cavity 1111 and is in contact with the windings 3 and the stator core 2 for heat exchange.

[0164] In some embodiments, the outlet 115 is circular, and the aperture of the outlet 115 is 1 mm to 4 mm. Since the aperture of the outlet 115 is small, the flow rate of the cooling liquid flowing out of the outlet 115 is small without external pressure, i.e., the cooling liquid in the first cavity 1111 can accumulate even with the outlet 115 and finally flow out of the second port 116 with a large size.

[0165] The aperture of the outlet 115 should not be too small. Due to the specification of the cooling liquid, the cooling liquid cannot flow out of the outlet 115 without external pressure, or the amount of cooling liquid flowing out of the outlet 115 is small, which cannot effectively drain the cooling liquid at the bottom. The aperture of the outlet 115 should also not be too large. When the aperture of the outlet 115 is too large, the cooling liquid flowing into the first cavity 1111 and flowing out of the first cavity 1111 reaches equilibrium, and the lubricating oil cannot fill the first cavity 1111, which cannot ensure effective heat exchange for all windings 3.

[0166] Please refer to FIGS. 11 to 13. In the first embodiment, the second cavity 1112 and the first cavity 1111 are arranged radially apart. Hereinafter, the second cavity 1112 and the first cavity 1111 are arranged radially apart as an example for description.

[0167] The collecting ring 30 comprises an inner ring part 12a, an outer ring part 13 and an end plate 14. The inner ring part 12a and the outer ring part 13 are annular structures, and the outer ring part 13 is arranged at the radially outer side of the inner ring part 12a. The inner ring part 12a and the outer ring part 13 are connected to the same side of the end plate 14. When the collecting ring 30 is installed in the shell 1 of the motor 100, the outer edge of the end plate 14 abuts against the inner wall of the shell 1, and the end plate 14 is sealed with the shell 1 to prevent leakage of the cooling liquid. The outer ring part 13 and the inner ring part 12a abut against and are sealed with the end part of the stator core 2. The outer ring part 13 serves as a partition between the second cavity 1112 and the first cavity 1111. Between the end plate 14 and the stator core 2, the second cavity 1112 is formed between the outer ring part 13 and the shell 1, and the first cavity 1111 is formed between the outer ring part 13 and the inner ring part 12a. The outer flow channel 70 on the outer side wall of the stator core 2 communicates with the second cavity 1112, and the end part of the winding 3 extends into the first cavity 1111. The outer ring part 13 is provided with a first communication port 1114, through which the cooling liquid enters the first cavity 1111 to cool the winding 3 in the first cavity 1111. In this embodiment, the pressure loss in the second cavity 1112 is small, and the cooling liquid enters the first cavity 1111 through the first communication port 1114 at a high speed, which can disturb the accumulation of the cooling liquid in the first cavity 1111 and enhance the convective heat exchange of the winding 3 and the stator core 2.

[0168] In this embodiment, the connection between the end of the outer ring part 13 away from the end plate 14 and the end part of the stator core 2 and the connection between the end of the inner ring part 12a away from the end plate 14 and the end part of the stator core 2 can adopt a sealing structure commonly used in the art to prevent leakage of the cooling liquid, which is not limited in this embodiment.

[0169] The number of the first communication ports 1114 provided on the outer ring part 13 is greater than or equal to 1. When the number of the first communication ports 1114 is plural, the plural first communication ports 1114 can be divided into one group, two groups or more groups. In some embodiments, the two adjacent groups of first communication ports 1114 can be arranged in a staggered manner or aligned in the axial direction. One group of first communication ports 1114 refers to a plurality of first communication ports 1114 arranged at intervals in the circumferential direction on the outer ring part 13, and a plurality of groups of first communication ports 1114 are arranged at intervals in the axial direction. The first communication ports 1114 are arranged uniformly on the outer ring part 13, so that a plurality of flows of the cooling liquid from the outer periphery to the central axis are formed in the first cavity 1111, which exchanges heat with the winding 3 during the flow to improve the cooling effect.

[0170] In other embodiments, the plural first communication ports 1114 are arranged in a spiral manner or irregularly on the outer ring part 13. The number and arrangement of the first communication ports 1114 are not limited in this embodiment.

[0171] In some embodiments, the first communication port 1114 is configured to enable the medium in the second cavity 1112 to enter the first cavity 1111 through the first communication port 1114 when the medium pressure in the second cavity 1112 is greater than a threshold value. The first communication port 1114 is a throttling hole, which is opened only when the pressure difference between the second cavity 1112 and the first cavity 1111 is large enough to discharge the coolant, so as to ensure that the coolant can accumulate in the second cavity 1112. In the case where a plurality of first communication ports 1114 are arranged circumferentially, the coolant is transported to the first cavity 1111 through different first communication ports 1114, and the coolant in the first cavity 1111 is disturbed to improve the heat exchange effect on the stator winding 3. Specifically, when the medium pressure in the second cavity 1112 is greater than the threshold value, it indicates that the pressure difference between the second cavity 1112 and the first cavity 1111 reaches the opening condition of the first communication port 1114. At this time, a certain amount of coolant has accumulated in the second cavity 1112, which needs to be discharged to ensure the flowability of the coolant and update the coolant in the first cavity 1111 in time.

[0172] In some embodiments, the outlet 115 can be arranged on the inner ring portion 12a. The coolant flowing from the first communication port 1114 to the inner ring portion 12a must pass through the winding 3, and the disturbance formed can drive the coolant between the two first communication ports 1114 to converge at the outlet 115, thereby enabling sufficient heat exchange with the winding 3.

[0173] In some embodiments, the outlet 115 can be arranged on the end plate 14, so that the flow direction of the coolant flowing out is towards the end cover of the shell 1, and the coolant will not directly spray on the rotor, which can reduce the influence of the coolant on the rotation of the rotor.

[0174] The inner ring portion 12a and the outer ring portion 13 can be straight, i.e., the inner ring portion 12a and the outer ring portion 13 extend along the axial direction, which has a simple overall structure and is easy to process and form. The inner ring portion 12a and the outer ring portion 13 can also be stepped, i.e., the inner ring portion 12a / outer ring portion 13 has two or more structures with different diameters along the axial direction. When the inner ring portion 12a has a ring-shaped portion protruding towards the central axis of the bus bar 30, and the outer ring portion 13 has a ring-shaped portion protruding towards the shell 1, the radial space of the first cavity 1111 can be expanded, thereby being applicable to the case of multiple layers of windings 3.

[0175] In the cross section perpendicular to the central axis of the bus bar 30, the outer ring portion 13 can be a complete annular ring, and a gap between the outer ring portion 13 and the shell 1 is sufficient. The outer ring portion 13 can include at least two arc segments connected end to end and having different diameters, thereby avoiding the structure welded on the inner wall of the shell 1.

[0176] In some embodiments, referring to FIG. 12, the bus ring 30 further comprises a connecting piece 20 having a hollow passage 21; the bus ring 30 is connected to one of the end plate 14 and the outer ring portion 13, and the hollow passage 21 is in communication with the first cavity 1111, and the lead-out wire passes through the hollow passage 21. It can be understood that a sealing member is needed between the lead-out wire and the inner wall of the hollow passage 21 to prevent the leakage of the cooling liquid. The size of the hollow passage 21 of the connecting piece 20 can be larger than that of the lead-out wire to facilitate the lead-out wire to pass through, and the gap between the lead-out wire and the hollow passage 21 can be filled and sealed by the sealing member.

[0177] Referring to FIGS. 14-19, in the second embodiment, the second cavity 1112 and the first cavity 1111 are arranged axially spaced apart, and the following description is given by taking the second cavity 1112 and the first cavity 1111 arranged axially spaced apart as an example.

[0178] The bus ring 30 comprises a first portion, a second portion and a partition plate 15, the first portion and the second portion are connected to the two sides of the partition plate 15 along the axial direction, and the partition plate 15 serves as a partition for the second cavity 1112 and the first cavity 1111. The second cavity 1112 is formed between the first portion and the partition plate 15, and the first portion is provided with a third port 113a, which is in communication with the outer flow channel 70 on the stator core 2; the first cavity 1111 is formed between the second portion and the partition plate 15. The second portion has an opening opposite to the partition plate 15, the winding 3 passes through the opening and extends into the first cavity 1111; the partition plate 15 is provided with a first communication port 1114 for communication between the second cavity 1112 and the first cavity 1111, the cooling liquid enters the second cavity 1112 through the outer flow channel 70 and the third port 113a, the cooling liquid in the second cavity 1112 enters the first cavity 1111 through the first communication port 1114, thereby cooling the winding 3 in the first cavity 1111.

[0179] The first part and the second part are distinguished only for the convenience of description. In actual application, the current collecting ring 30 can be a whole structure, the inside of the current collecting ring 30 is divided into the second cavity 1112 and the first cavity 1111 which are spaced along the axial direction by the partition plate 15, the first communication port 1114 which communicates the second cavity 1112 and the first cavity 1111 is formed on the partition plate 15, the current collecting ring 30 has the third port 113a which communicates the second cavity 1112, and the current collecting ring 30 is further provided with an opening which communicates the first cavity 1111, and the opening is arranged opposite to the partition plate 15. In this embodiment, the current collecting ring 30 forms two layers of cavities, the second cavity 1112 and the first cavity 1111 which are arranged along the axial direction, the cooling liquid in the first cavity 1111 enters the second cavity through the first communication port, and cools and lowers the temperature of the part of the winding which extends into the second cavity and the axial end of the stator core. Since the radial side of the first cavity 1111 is not blocked by other objects, the radial space of the first cavity 1111 is only limited by the size of the internal space of the shell 1, and can be applied to the application environment of the multi-layer winding 3.

[0180] In addition, the second cavity 1112 supplies the cooling liquid to the first cavity 1111 through the first communication port 1114, the first cavity 1111 is not directly communicated with the outer flow channel 70 of the stator core 2, the pressure loss in the second cavity 1112 is small, the speed of the cooling liquid entering the first cavity 1111 is fast, the disturbance effect on the cooling liquid can be enhanced, and the convective heat transfer of the winding 3 and the stator core 2 can be enhanced.

[0181] The current collecting ring 30 can include the inner ring part 12a, the outer ring part 13, the partition plate 15 and the end plate 14, the inner ring part 12a and the outer ring part 13 are annular structures, the outer ring part 13 is arranged at the radial outside of the inner ring part 12a, the inner edge of the partition plate 15 is connected with the inner ring part 12a, and the outer edge of the partition plate 15 is connected with the outer ring part 13, so as to divide the second cavity 1112 and the first cavity 1111; the inner ring part 12a is divided into the second inner ring part 122a and the first inner ring part 121a by the partition plate 15, and the outer ring part 13 is divided into the second outer ring part 132 and the first outer ring part 131 by the partition plate 15.

[0182] In the first example of this embodiment, as shown in FIGS. 14 and 15, the first part includes the end plate 14, the second inner ring part 122a and the second outer ring part 132, the end plate 14 and the partition plate 15 are arranged spaced along the axial direction, the second outer ring part 132 is arranged at the radial outside of the second inner ring part 122a, and the second outer ring part 132 and the second inner ring part 122a are both connected between the end plate 14 and the partition plate 15.

[0183] The diameter of the second outer ring portion 132 can be smaller than the diameter of the end plate 14, as shown in FIG. 14, and the second cavity 1112 is surrounded by the end plate 14, the second inner ring portion 122a, the second outer ring portion 132, and the partition plate 15, and a third port 113a is formed in the second outer ring portion 132. The outer edge of the end plate 14 is in abutment and sealed with the inner wall of the housing 1. Since the diameter of the second outer ring portion 132 is smaller than the diameter of the end plate 14, i.e., there is a gap between the second outer ring portion 132 and the inner wall of the housing 1, which can be used for the flow of the cooling liquid. By forming the third port 113a in the second outer ring portion 132, the cooling liquid can flow into the second cavity 1112 from the third port 113a.

[0184] The diameter of the second outer ring portion 132 can be the same as the diameter of the end plate 14, as shown in FIG. 15, i.e., the second outer ring portion 132 is connected to the outer edge of the end plate 14, and both the end plate 14 and the second outer ring portion 132 are in contact with the inner wall of the housing 1, which can increase the contact area of the collector ring 30 with the housing 1 and improve the stability of the collector ring 30 installed in the housing 1. In this case, the second cavity 1112 is surrounded by the end plate 14, the second inner ring portion 122a, the second outer ring portion 132, and the partition plate 15, and a third port 113a can be formed in the second outer ring portion 132. An oil passage can be provided on the housing 1 to communicate with the outer flow channel 70 on the stator core 2 and the third port 113a. Alternatively, the third port 113a can be formed in the partition plate 15, and the third port 113a is located outside the first outer ring portion 131. It can be understood that the diameter of the first outer ring portion 131 needs to be smaller than the diameter of the end plate 14. The cooling liquid flows through the channel formed between the first outer ring portion 131 and the inner wall of the housing 1, and then enters the second cavity 1112 through the third port 113a.

[0185] In the second example of the present embodiment, as shown in FIG. 16, the first portion includes the end plate 14 and the second inner ring portion 122a, and the second example differs from the first example in that it does not have a second outer ring portion 132. The end plate 14, the partition plate 15, the second inner ring portion 122a, and the inner wall of the housing 1 together surround the second cavity 1112. In this case, an oil passage can be directly provided on the housing 1 to communicate the second cavity 1112 with the outer flow channel 70 on the stator core 2.

[0186] When the diameter of the partition plate 15 is smaller than the diameter of the end plate 14, the third port 113a is formed between the edges of the partition plate 15 and the end plate 14. When the diameter of the partition plate 15 is equal to the diameter of the end plate 14, the third port 113a is formed in the partition plate 15.

[0187] In the third example of the embodiment, as shown in FIGS. 14-16, the second part includes a first inner ring portion 121a and a first outer ring portion 131, and an opening is formed between the first inner ring portion 121a and the first outer ring portion 131. Since there is no obstruction by other components, the radial distance between the second inner ring portion 122a and the first inner ring portion 121a is the radial dimension of the first cavity 1111, and the space between the second inner ring portion 122a and the first inner ring portion 121a is fully utilized, which facilitates the multi-layer winding 3 to extend into the first cavity 1111 from the opening.

[0188] The diameter of the first outer ring portion 131 can be smaller than the diameter of the end plate 14, as shown in FIGS. 15 and 16. In this case, a passage is formed between the first outer ring portion 131 and the shell 1, and the cooling liquid can enter the second cavity 1112 through the passage between the first outer ring portion 131 and the shell 1, or an oil passage can be provided on the shell 1 to communicate with the second cavity 1112.

[0189] The diameter of the first outer ring portion 131 can be equal to the diameter of the end plate 14, as shown in FIG. 14. In this case, the end plate 14 and the first outer ring portion 131 are in contact with the inner wall surface of the shell 1, which can increase the contact area and improve the stability of the commutator ring 30 installed in the shell 1. In this case, the side of the first outer ring portion 131 away from the first inner ring portion 121a forms an axial liquid passage. For example, the first outer ring portion 131 can be concave to form the liquid passage, and the liquid passage is independent of the first cavity 1111. The liquid passage on the first outer ring portion 131 communicates with the outer flow channel 70 on the stator core 2 and the second cavity 1112. An oil passage can also be provided on the shell 1 to communicate with the second cavity 1112.

[0190] It can be understood that the first example and the third example can be combined with each other, and the second example and the third example can be combined with each other without conflict, which is not limited in the present application.

[0191] Whether the first example and the third example are combined or the second example and the third example are combined, the commutator ring 30 has a first inner ring and a second inner ring, and the outlet 115 can be arranged at different positions according to the size relationship between the first inner ring and the second inner ring.

[0192] Specifically, when the second inner ring portion 122a and the first inner ring portion 121a are flush, the second inner ring portion 122a and the first inner ring portion 121a can be regarded as a whole, at this time, the outlet 115 can be arranged on the first inner ring portion 121a, at this time, the cooling liquid enters the first cavity 1111 from the first communication port 1114 on the partition plate 15 along the axial direction, and flows out from the first inner ring portion 121a along the radial direction after heat exchange with the end portion of the winding 3 and the stator core 2. Compared with the straight radial in-out, the flow path of the cooling liquid can be increased, the turbulence is formed in the first cavity 1111, which is beneficial to contact and heat exchange with the winding 3 and the stator core 2.

[0193] When the diameter of the second inner ring portion 122a is smaller than the diameter of the first inner ring portion 121a, the inner ring portion 12a is a stepped structure, the inner edge of the partition plate 15 is connected with the first outer ring portion 131, and part of the partition plate 15 is located between the second inner ring portion 122a and the first inner ring portion 121a. In this case, the outlet 115 can be arranged on the first inner ring portion 121a, which has the same effect as when the second inner ring portion 122a and the first inner ring portion 121a are flush. The outlet 115 can also be arranged on the partition plate 15 and located between the second inner ring portion 122a and the first inner ring portion 121a. As shown in FIG. 18, the partition plate 15 includes a second ring portion 152 and a first ring portion 151, the outer edge of the second ring portion 152 is connected with the second outer ring portion 132, and the inner edge of the second ring portion 152 is connected with the second inner ring portion 122a; the outer edge of the first ring portion 151 is connected with the second inner ring portion 122a, and the inner edge of the first ring portion 151 is connected with the first inner ring portion 121a; and the first ring portion 151 is provided with the outlet 115 which is in communication with the first cavity 1111. Thus, the cooling liquid in the first cavity 1111 flows out from the outlet 115 along the axial direction, and the flow direction of the cooling liquid flowing out from the outlet 115 is towards the end cover of the housing 1, instead of directly splashing on the rotor, which can reduce the influence on the movement of the rotor.

[0194] The second outer ring portion 132 can be a complete circular ring structure, that is, in the cross section perpendicular to the central axis of the busbar 30, the second outer ring portion 132 is a circular ring. When there is no other component arranged on the inner wall of the housing 1, the circular ring-shaped second outer ring portion 132 can be selected, which can match the cross-sectional shape of the second outer ring portion 132 and the housing 1, so as to keep the second outer ring portion 132 in close contact with the inner wall of the housing 1 or form an equal-diameter gap. The first outer ring portion can be formed by connecting circular rings with diameters greater than or equal to 2, as shown in FIG. 20, the second outer ring portion 132 includes at least two arc segments which are connected at the head and tail and have different diameters. When there is other component arranged on the inner wall of the housing 1, the second outer ring portion 132 is formed by connecting circular rings with diameters greater than or equal to 2, so as to avoid the component on the inner wall of the housing 1, which can facilitate the welding to fill the gap between the housing 1 and the second outer ring portion 132.

[0195] Similarly to the second outer ring portion 132, the first outer ring portion 131 can be a complete annular structure, or formed by connecting annular rings with diameters greater than or equal to 2. That is, in a cross section perpendicular to the central axis of the busbar 30, the first outer ring portion 131 is annular, or the first outer ring portion 131 includes at least two arc segments connected head to tail and with different diameters. This application will not be described in detail.

[0196] The second inner ring portion 122a and the first inner ring portion 121a can be arranged according to the shape of the second outer ring portion 132 and the first outer ring portion 131. The second inner ring portion 122a and the first inner ring portion 121a can also be a complete annular structure, or formed by connecting annular rings with diameters greater than or equal to 2.

[0197] Please refer to FIGS. 21 to 24, in some embodiments, the busbar 30 further includes a connecting piece 20, the connecting piece 20 has a hollow passage 21; the busbar 30 has various installation modes, no matter which installation mode is adopted, the lead wire passes through the hollow passage 21, and a seal is provided on the lead wire sheath, which is sealed by abutting against the inner wall of the hollow passage 21, so as to avoid leakage of the cooling liquid. Understandably, the size of the hollow passage 21 of the connecting piece 20 can be greater than the size of the lead wire, so as to facilitate the lead wire to pass out and be filled and sealed by the seal.

[0198] Specifically, the connecting piece 20 can be connected with the end plate 14, the hollow passage 21 is in communication with the second cavity 1112, and the partition plate 15 is provided with a wire passing hole corresponding to the hollow passage 21. As shown in FIGS. 11 and 12, the lead wire passes out of the wire passing hole and enters the hollow passage 21 after passing through the second cavity 1112. It needs to be clear that the present embodiment can be provided with a seal between the lead wire and the edge of the wire passing hole, or the gap between the lead wire and the wire passing hole can be maintained for the cooling liquid to enter the second cavity from the first cavity.

[0199] The connecting piece 20 can pass through the end plate 14 and be connected with the partition plate 15, and the hollow passage 21 is in communication with the first cavity 1111. As shown in FIG. 13, the connecting piece 20 is sealed with the end plate 14, and the sealing can be achieved by using sealing glue, welding and the like, and the lead wire directly passes through the hollow passage 21.

[0200] The connecting piece 20 can also be connected with the first outer ring portion 131, and the hollow passage 21 is in communication with the first cavity 1111. As shown in FIG. 14, the connecting piece 20 is sealed with the first outer ring portion 131, and the sealing can be achieved by using sealing glue, welding and the like, and the lead wire directly passes through the hollow passage 21 after being bent.

[0201] It should be noted that the motor 100 in the present application, both ends of the stator core 2 are provided with the bus ring 30, at least one bus ring 30 adopts the structure in the first embodiment or the second embodiment. That is to say, among the bus rings 30 at both ends of the stator core 2, one bus ring 30 can adopt one of the radial double-layer structure, the single-layer structure, the radial double-layer structure and the axial double-layer structure; or, one bus ring 30 adopts the axial double-layer structure, and the other bus ring 30 adopts one of the single-layer structure or the axial double-layer structure.

[0202] In the pure electric vehicle and the hybrid electric vehicle, the motor is used as the main power source of the vehicle 900, and the performance of the motor is an important factor affecting the power performance of the whole vehicle. Amorphous materials such as iron, silicon and boron have the advantage of low iron loss and are applied to the motor, but there are many problems such as poor thermal conductivity and low thermal expansion coefficient of the amorphous material itself. In the operation process of the motor, a large amount of Joule heat is generated in the stator itself, which leads to the performance decline of the motor.

[0203] The present application provides a motor, which comprises a shell, a stator and a motor rotor, the stator is accommodated in the shell, and the motor rotor is arranged in the stator. The main function of the stator is to generate a rotating magnetic field, and the main function of the motor rotor is to be cut by the magnetic lines of force in the rotating magnetic field and then output current to convert into mechanical energy. The stator comprises a stator core and a winding, the stator core is formed by grouping and laminating silicon steel punching sheets with a high silicon content, and the winding comprises multiple turns of coils, which are wound on the stator core according to a specific rule to form a required magnetic field distribution. Meanwhile, the winding also comprises lead-out wires connected with the coils, and the lead-out wires are used to connect the winding with an external power supply or control system to ensure that the current can flow smoothly into the winding, thereby driving the operation of the motor. During the operation of the motor, losses will be generated, which will heat the motor components as a heat source, causing the temperature of the motor to rise.

[0204] In the prior art, the stator core and the winding are cooled by spraying or immersing cooling liquid, and the lead-out wires of the winding need to pass through the cooling liquid to communicate with the external circuit, so that the sealing effect of the lead-out wires is poor and the cooling liquid is prone to leakage.

[0205] Please refer to FIG. 25, FIG. 26 and FIG. 27, FIG. 25 is a structural schematic diagram of a sealing assembly and a lead-out wire according to an embodiment of the present application, FIG. 26 is a structural schematic diagram of a bus ring according to an embodiment of the present application, and FIG. 27 is a structural schematic diagram of a sealing cover according to an embodiment of the present application.

[0206] The application provides a sealing assembly, which comprises a bus ring 30, a wire sleeve 200a and a sealing cover 300a. The bus ring 30 can be connected to a shell, and the bus ring 30 has a gap on the side axially away from a stator core; or the bus ring 30 is arranged inside the shell, and the bus ring 30 is directly connected to the side axially away from the stator core. The bus ring 30 comprises a first through hole 110a and oppositely arranged inner and outer side walls 120b and 130, the first through hole 110a penetrates the inner and outer side walls 120b and 130, the inner side wall 120b is arranged on the side of the bus ring 30 close to the stator core, and the inner side wall 120b surrounds a bus space for accommodating windings. The bus space contains cooling liquid to cool the windings.

[0207] The first through hole 110a of the bus ring 30 is in communication with the bus space, the wire sleeve 200a is filled in the first through hole 110a, and the wire sleeve 200a is used to hinder the cooling liquid in the bus space from flowing out through the first through hole 110a. The sealing cover 300a is connected to the wire sleeve 200a, and the sealing cover 300a is arranged on the port on the side of the first through hole 110a away from the bus space to limit the wire sleeve 200a in the first through hole 110a, improve the stability of the installation of the wire sleeve 200a, inhibit the wire sleeve 200a from being pulled out of the first through hole 110a, and further improve the sealing effect on the lead-out wire 400 and inhibit the leakage of the cooling liquid in the bus ring 30. The wire sleeve 200a is provided with a wire passing hole 210a, the sealing cover 300a is provided with a second through hole 310a, the wire passing hole 210a is in communication with the bus space and the second through hole 310a, so that the lead-out wire 400 on the winding passes out of the bus space through the wire passing hole 210a and the second through hole 310a to be connected to an external circuit, and the power supply of the winding is realized.

[0208] The lead-out wire 400 comprises a first section and a second section connected to each other, the first section of the lead-out wire 400 extends along the axial direction of the stator core, the second section of the lead-out wire 400 extends along the radial direction of the stator core, and the second section of the lead-out wire 400 is located outside the bus space surrounded by the bus ring 30 and the stator core. The first section of the lead-out wire 400 passes through the first through hole 110a, the wire passing hole 210a and the second through hole 310a to be connected to the second section, so as to realize the communication of the winding circuit.

[0209] Please refer to FIG. 26, FIG. 27, FIG. 28 and FIG. 29, FIG. 26 is a structural schematic diagram of the bus ring according to an embodiment of the application, FIG. 27 is a structural schematic diagram of the sealing cover according to an embodiment of the application, FIG. 28 is a structural schematic diagram of the sealing cover from another perspective according to an embodiment of the application, and FIG. 29 is a structural schematic diagram of the wire sleeve according to an embodiment of the application.

[0210] In the sealing assembly provided by the application, the cross section of the wire sleeve 200a can be circular, square or the like, and the embodiment of the application takes the circular cross section of the wire sleeve 200a as an example for description.

[0211] The wire sleeve 200a includes a wire sleeve body 220a and a fifth protrusion 230a, the wire sleeve body 220a is provided with the wire hole 210a penetrating along the axial direction of the wire sleeve body 220a, the wire sleeve body 220a is inserted into the first through hole 110a, and the fifth protrusion 230a is protruded on the radial outer circumferential wall of the wire sleeve body 220a; the fifth protrusion 230a is clamped between the outer side wall 130 of the bus ring 30 and the sealing cover 300a. Specifically, the axis of the first through hole 110a is coaxial with the axis of the wire sleeve 200a, one side of the fifth protrusion 230a along the axial direction of the wire sleeve body 220a abuts against the outer side wall 130, and the other side of the fifth protrusion 230a along the axial direction of the wire sleeve body 220a abuts against the sealing cover 300a, so as to limit both sides of the fifth protrusion 230a on the axis of the first through hole 110a, thereby inhibiting the wire sleeve 200a from being pulled out of the first through hole 110a, and further improving the sealing effect of the lead-out wire 400 and inhibiting the leakage of the cooling liquid in the bus space.

[0212] Optionally, the fifth protrusion 230a is arranged around the wire sleeve body 220a, that is, the fifth protrusion 230a is arranged in a ring shape, so as to further improve the stability of the installation of the wire sleeve 200a and inhibit the wire sleeve 200a from being pulled out of the first through hole 110a.

[0213] In the sealing cover 300a provided in the application, the hole wall of the second through hole 310a is provided with a sixth protrusion 311 radially inward, and the fifth protrusion 230a is clamped between the outer side wall 130 of the bus ring 30 and the sixth protrusion 311. Specifically, the sixth protrusion 311 is arranged in a ring shape, so as to improve the limiting effect of the fifth protrusion 230a; the inner diameter of the sixth protrusion 311 is smaller than the inner diameter of the first through hole 110a, the sealing cover 300a is connected with the bus ring 30, and the sealing cover 300a is located outside the bus space, so that the sixth protrusion 311 is arranged on the port of the first through hole 110a away from the bus space. Moreover, the inner diameter of the sixth protrusion 311 is smaller than the inner diameter of the fifth protrusion 230a, so that the sixth protrusion 311 abuts against the fifth protrusion 230a, thereby axially blocking the wire sleeve 200a and inhibiting the wire sleeve 200a from being pulled out of the first through hole 110a.

[0214] In an embodiment, the inner side wall 120b and the outer side wall 130 are oppositely arranged in the axial direction of the stator core, that is, the first through hole 110a extends in the axial direction of the stator core, and the wire sleeve 200a arranged in the first through hole 110a will move in the axial direction of the stator core. The sealing cover 300a is connected with the bus ring 30, so that the sealing cover 300a is arranged on the port of the first through hole 110a in the axial direction of the stator core, thereby limiting the axial movement of the wire sleeve 200a and inhibiting the wire sleeve 200a from being pulled out of the first through hole 110a.

[0215] In the sealing assembly provided by the present application, the wire sleeve 200a can be provided in plurality, the sealing cover 300a can be provided in plurality, the number of the wire sleeve 200a is consistent with the number of the sealing cover 300a. The busbar 30 is provided with a plurality of first through holes 110a, the number of the first through holes 110a is consistent with the number of the wire sleeve 200a, so as to limit the plurality of wire sleeves 200a in the plurality of first through holes 110a respectively.

[0216] For a three-phase motor, the winding includes three lead wires 400, the winding is powered through the lead wires 400, so as to generate a rotating magnetic field to drive the motor to rotate. In addition, in the three-phase motor, a thermocouple can be used to monitor the temperature of the motor, to ensure that the motor is within the normal operating range. By installing the thermocouple on the motor, and connecting the winding and the temperature control system through the thermocouple wire, the temperature of the motor can be monitored in real time, and the motor load or shutdown protection can be reduced. The thermocouple wire is also sealed and fixed through the wire sleeve 200a and the sealing cover 300a, that is, the sealing assembly provided by the present application can realize sealing in multiple wire-out situations, and inhibit leakage of the cooling liquid.

[0217] The material of the wire sleeve 200a can be rubber, silicone or plastic, etc. with elastic material. Specifically, it can be silicone rubber (SI L), fluorine rubber (FKM), PVC (polyvinyl chloride) and PE (polyethylene), etc. The wire sleeve 200a is in interference fit with the first through hole 110a, so as to realize the sealing between the wire sleeve 200a and the first through hole 110a, to hinder the cooling liquid in the busbar space from flowing out through the first through hole 110a. And the wire sleeve 200a is in interference fit with the lead wire 400 of the winding through the wire hole 210a, so as to realize the sealing between the wire sleeve 200a and the lead wire 400 of the winding, thereby improving the overall sealing effect of the sealing assembly, and inhibiting the leakage of the cooling liquid. Wherein, the shape of the wire hole 210a is shaped with the shape of the lead wire 400, and the shape of the wire hole 210a can be circular, rectangular or trapezoidal, etc., which is not limited specifically.

[0218] Please refer to FIG. 26, FIG. 27 and FIG. 29, FIG. 26 is a structural schematic diagram of the busbar according to an embodiment of the present application, FIG. 27 is a structural schematic diagram of the sealing cover according to an embodiment of the present application, and FIG. 29 is a structural schematic diagram of the wire sleeve according to an embodiment of the present application. In an embodiment, the outer sidewall 130 comprises a first region 131b and a second region 132a, the first through hole 110a is arranged on the first region 131b, the first through hole 110a penetrates the first region 131b and the inner sidewall 120b, the second region 132a is located at the outer edge of the first region 131b, and the first region 131b protrudes from the second region 132a towards the side away from the inner sidewall 120b, the mounting surface 140 is formed between the first region 131b and the second region 132a, and the sealing cover 300a is connected with the mounting surface 140. That is, the first region 131b, the mounting surface 140 and the second region 132a are connected to form a step for mounting the sealing cover 300a, and the fifth protrusion 230a is clamped between the first region 131b and the sixth protrusion 311 to realize the fixation of the wire sleeve 200a.

[0219] In the sealing assembly provided by the present application, the first thread 141a is arranged on the mounting surface 140, the second thread 312a is arranged on the hole wall of the second through hole 310a, the first thread 141a is connected with the second thread 312a, the sealing cover 300a is sleeved on the mounting surface 140 to realize the fixation of the sealing cover 300a. That is, the sealing cover 300a in the embodiment of the present application is fixed by the threaded connection with the busbar 30, and other embodiments are not limited.

[0220] When the wire sleeve 200a is installed, the wire sleeve 200a is inserted into the first through hole 110a of the busbar 30, the fifth protrusion 230a abuts against the first region 131b, and then the sealing cover 300a is tightly fixed on the busbar 30, so as to realize the fixation of the wire sleeve 200a. The wire sleeve 200a with elasticity can increase the friction force between the sealing cover 300a and the busbar 30 during the fastening process, thereby improving the fastening force of the sealing cover 300a and preventing the sealing cover 300a from being detached. Meanwhile, during the fastening process of the sealing cover 300a, the sealing cover 300a can extrude the fifth protrusion 230a of the wire sleeve 200a to further improve the sealing property between the wire sleeve 200a and the busbar 30.

[0221] Please refer to FIG. 27, FIG. 30 and FIG. 31, FIG. 27 is a structural schematic diagram of the sealing cover according to an embodiment of the present application, FIG. 30 is a structural schematic diagram of the bus ring according to another embodiment of the present application, and FIG. 31 is a structural schematic diagram of the wire sleeve according to another embodiment of the present application. The seventh protrusion 111a is arranged on the hole wall of the first through hole 110a in a radially inward direction, the wire passing hole 210a penetrates the wire sleeve 200a along the axial direction of the wire sleeve 200a, and the first end of the wire sleeve 200a along the axial direction abuts against the seventh protrusion 111a; the sixth protrusion 311 is arranged on the hole wall of the second through hole 310a in a radially inward direction, and the second end of the wire sleeve 200a along the axial direction abuts against the sixth protrusion 311, that is, the wire sleeve 200a is clamped as a whole between the sixth protrusion 311 and the seventh protrusion 111a. Specifically, the seventh protrusion 111a can support the wire sleeve 200a, and when the wire sleeve 200a is installed in the first through hole 110a, the first end of the wire sleeve 200a abuts against the seventh protrusion 111a, and the second end of the wire sleeve 200a abuts against the sixth protrusion 311 of the sealing cover 300a, so as to fix the wire sleeve 200a. The inner wall shape of the seventh protrusion 111a can be shaped according to the wire passing hole 210a, so as to improve the uniformity of the support for the wire sleeve 200a.

[0222] It should be noted that when the seventh protrusion 111a is arranged on the hole wall of the first through hole 110a, the fifth protrusion 230a can be omitted on the wire sleeve 200a, and at this time, the wire sleeve 200a is substantially cylindrical, and the wire sleeve 200a can also be fixed in the first through hole 110a. Or the seventh protrusion 111a is arranged on the hole wall of the first through hole 110a, and the fifth protrusion 230a is arranged on the outer wall of the wire sleeve 200a, so as to further improve the firmness of the installation of the wire sleeve 200a and inhibit the wire sleeve 200a from being pulled out of the first through hole 110a.

[0223] During the operation of the motor, the motor will vibrate, and the wire sleeve 200a is fixed on the bus ring 30 through the sealing cover 300a, so as to inhibit the wire sleeve 200a from being pulled out of the first through hole 110a, improve the sealing performance of the whole sealing assembly, and inhibit the leakage of the cooling liquid.

[0224] Referring to FIG. 32, the application provides an electric machine 100, which comprises a shell 1, a stator 10 accommodated in the shell 1, and an electric machine 100 rotor provided in the stator 10. The main function of the stator 10 is to generate a rotating magnetic field, and the main function of the electric machine 100 rotor is to be cut by the magnetic lines of force in the rotating magnetic field to output current converted into mechanical energy. The stator 10 comprises a stator core 2 and a winding 3. The stator core 2 is formed by grouping and laminating silicon steel punching sheets with a high silicon content. The winding 3 comprises multiple turns of coils, which are wound on the stator core according to a specific rule to form a required magnetic field distribution. Meanwhile, the winding 3 also comprises lead-out wires connected with the coils. These lead-out wires are used to connect the winding 3 with an external power supply or control system to ensure that current can flow smoothly into the winding, thereby driving the operation of the electric machine 100. During the operation of the electric machine 100, losses will be generated, which will heat the components of the electric machine 100 as a heat source, causing the temperature of the electric machine 100 to rise.

[0225] In the prior art, when the stator 10 is cooled by spraying or immersing a cooling medium, the sealing effect on the stator 10 is poor, which easily leads to leakage of the cooling medium.

[0226] Referring to FIGS. 32, 33 and 34, the application provides a stator 10, which comprises a stator core 2, an insulation sleeve 200, a second sealing strip 300 and a winding 3. The stator core 2 has a stator slot 111 extending along the axial direction of the stator core 2, and the stator slot 111 has a slot opening 131a directed radially inward of the stator core 2. The insulation sleeve 200 is inserted into the stator slot 111. The second sealing strip 300 is integrally arranged with the insulation sleeve 200, and the second sealing strip 300 and the insulation sleeve 200 enclose a mounting hole 310 extending along the axial direction of the stator core 2 and located in the stator slot 111. The second sealing strip 300 blocks the slot opening 131a of the stator slot 111, and the winding 3 is inserted into the mounting hole 310. In the application, the insulation sleeve 200 is arranged in the stator slot 111, the insulation sleeve 200 and the second sealing strip 300 enclose the mounting hole 310, and the winding 3 is inserted into the mounting hole 310, thereby realizing insulation between the winding 3 and the stator core 2. The second sealing strip 300 is connected with the stator core 2 to block the slot opening 131a of the stator slot 111, thereby realizing radial sealing of the stator core 2 and inhibiting leakage of the cooling medium from the stator 10. The insulation sleeve 200 and the second sealing strip 300 are integrally arranged, thereby improving the reliability of the connection between the insulation sleeve 200, the second sealing strip 300 and the stator core 2, and improving the sealing effect on the stator 10.

[0227] The stator core 2 includes a stator yoke 110 and a plurality of stator tooth portions 120a. The stator yoke 110 is an annular or approximately annular structure with a thickness. The plurality of stator tooth portions 120a are convexly provided on the inner wall of the stator yoke 110 at intervals in the circumferential direction of the stator core 2. Each stator tooth portion 120a extends along the axial direction of the stator core 2. A stator slot 111 is formed between two adjacent stator tooth portions 120a. The second sealing strip 300 is connected to two adjacent stator tooth portions 120a to block the notch 131a of the stator slot 111, thereby suppressing the leakage of the cooling medium from the notch 131a of the stator slot 111.

[0228] Among them, the insulating sleeve 200 includes a first insulating portion 210, a second insulating portion 220 and a third insulating portion 230 that are connected in sequence. One end of the first insulating portion 210 far from the second insulating portion 220 and one end of the third insulating portion 230 far from the second insulating portion 220 are both connected to the second sealing strip 300. Specifically, the insulating sleeve 200 provided in the embodiment of the present application is generally U-shaped, and the first insulating portion 210 and the third insulating portion 230 are both connected to the second sealing strip 300 to enclose an installation hole 310 for installing the winding 3, improving the sealing performance of the winding 3. When there is a cooling medium flowing in the installation hole 310, the leakage of the cooling medium can be suppressed.

[0229] In a possible implementation manner, the insulating sleeve 200 is in a "mouth" shape, the installation hole 310 can be separately enclosed by the insulating sleeve 200, and the second sealing strip 300 is integrally provided on the outer wall of the insulating sleeve 200 to block the notch 131a of the stator slot 111.

[0230] In the stator 10 provided in the present application, the first insulating portion 210 and the third insulating portion 230 are respectively connected to two side walls of two adjacent stator tooth portions 120a that are close to each other, and the second insulating portion 220 is connected to the inner wall of the stator yoke 110 located between two adjacent stator tooth portions 120a. Specifically, the inner wall of the stator yoke 110 located between two adjacent stator tooth portions 120a and two side walls of two adjacent stator tooth portions 120a that are close to each other enclose the groove wall of the stator slot 111. The first insulating portion 210, the second insulating portion 220, the third insulating portion 230 and the second sealing strip 300 are all integrally injection-molded on the groove wall of the stator slot 111 to improve the connection stability between the insulating sleeve 200 and the second sealing strip 300 and the stator core 2, and improve the sealing performance of the stator 10. At the same time, the insulating sleeve 200 and the seal are integrally injection-molded, reducing the number of parts of the stator 10 and lowering the installation difficulty of the insulating sleeve 200 and the seal.

[0231] The materials of the insulating sleeve 200 and the second sealing strip 300 can be rubber, silica gel, polytetrafluoroethylene, polyimide, polyethylene, polyvinyl chloride, polypropylene, etc.

[0232] Each of the stator tooth portions 120a in the stator core 2 comprises a tooth root portion 121b connected with the inner wall of the stator yoke portion 110 and a stop portion 122b connected with one end of the tooth root portion 121b away from the stator yoke portion 110, and a slot opening 131a of the stator slot 111 is formed between two adjacent stop portions 122b; the second sealing strip 300 is connected with two side walls of two adjacent stop portions 122b close to each other. Specifically, the insulation sleeve 200 is located between two adjacent tooth root portions 121b, and the interval between the two adjacent tooth root portions 121b is greater than the interval between the two adjacent stop portions 122b, so as to form the slot opening 131a at one end of the two adjacent stator tooth portions 120a, and the second sealing strip 300 is filled between the two adjacent stop portions 122b, so as to achieve the plugging of the slot opening 131a.

[0233] The end face of the second sealing strip 300 away from the stator yoke portion 110 is on the same plane as the end face of the stop portion 122b away from the tooth root portion 121b, and the same plane can be the same arc plane or the same plane. Alternatively, the second sealing strip 300 is connected between two adjacent stop portions 122b, and the end face of the second sealing strip 300 is connected with the end face of the tooth root portion 121b to form a complete arc plane, so that the gap between the stator core 2 and the rotor of the motor 100 is consistent, and the leakage of the cooling medium into the gap between the stator core 2 and the rotor of the motor 100 can be inhibited.

[0234] In the stator 10 provided in the present application, the stator 10 further comprises a bus ring 30, and a sealing structure is arranged between the bus ring 30 and the stator core 2 and / or between the bus ring 30 and the second sealing strip 300, so as to achieve the sealing between the bus ring 30 and the stator core 2 and between the bus ring 30 and the second sealing strip 300.

[0235] In an embodiment, two current collecting rings 30 are provided, the two current collecting rings 30 are respectively a first current collecting ring 4 and a second current collecting ring 5, the first current collecting ring 4 is arranged on one side of the stator core 2 in the axial direction, and a region between the first current collecting ring 4 and the one side of the stator core 2 forms a current collecting space 301, a region between the second current collecting ring 5 and the other side of the stator core 2 forms another current collecting space 301, and two ends of the winding 3 are respectively accommodated in the two current collecting spaces 301, and the mounting hole 310 is in communication with the two current collecting spaces 301. In the stator yoke 110, a cooling flow channel 550 is arranged to penetrate the stator yoke 110 in the axial direction, and / or a cooling flow channel 550 is arranged between the outer wall of the stator yoke 110 and the inner wall of the shell 1, and the cooling flow channel 550 is in communication with the two current collecting spaces 301. Specifically, the first current collecting ring 4 and the second current collecting ring 5 can be respectively connected to the two sides of the shell 1 in the axial direction, so that the region between the first current collecting ring 4 and the stator core 2 forms a current collecting space 301, and the region between the second current collecting ring 5 and the stator core 2 forms another current collecting space 301; or the first current collecting ring 4 and the second current collecting ring 5 are both arranged inside the shell 1, and the first current collecting ring 4 is directly sleeved on one side of the stator core 2 in the axial direction, and the second current collecting ring 5 is directly sleeved on the other side of the stator core 2 in the axial direction, so that the first current collecting ring 4 and the stator core 2 form a current collecting space 301, and the second current collecting ring 5 and the stator core 2 form another current collecting space 301.

[0236] A cooling medium flows in the current collecting space 301 to cool the stator core 2 and the winding 3. The cooling medium can flow from one current collecting space 301 to another current collecting space 301 through the cooling flow channel 550 or the mounting hole 310 to further cool the stator core 2 and the winding 3. The cooling medium can be a cooling liquid or a cooling gas.

[0237] Referring to FIG. 33 and FIG. 35, the sealing structure comprises a second sealing ring 600, the second sealing ring 600 comprises a first sub-sealing ring 610 and a second sub-sealing ring 620, the second sealing strip 300 extends along the axial direction of the stator core 2, the second sealing strip 300 and the stator tooth portion 120a at one end surface of the stator core 2 in the axial direction form a first abutting surface 141 in abutment, and the second sealing strip 300 and the stator tooth portion 120a at the other end surface of the stator core 2 in the axial direction form a second abutting surface 142 in abutment; the first sub-sealing ring 610 is in abutment between the inner wall of the first bus ring 4 and the first abutting surface 141, and the second sub-sealing ring 620 is in abutment between the inner wall of the second bus ring 5 and the second abutting surface 142. Specifically, the first sub-sealing ring 610 is arranged around the circumference of the stator core 2, and the second sub-sealing ring 620 is arranged around the circumference of the stator core 2, the first sub-sealing ring 610 is in abutment on the first abutting surface 141, and the second sub-sealing ring 620 is in abutment on the second abutting surface 142, so that the projection of the mounting hole 310 in the axial direction of the stator core 2 is located in the bus space 301, thereby achieving sealing between the first bus ring 4 and the stator core 2 and between the second bus ring 5 and the stator core 2, and inhibiting leakage of the cooling medium in the bus space 301 or the mounting hole 310.

[0238] Referring to FIG. 35, FIG. 36 and FIG. 37, the stator 10 further comprises a connecting ring, the stator slot 111 is provided in plurality, the plurality of stator slots 111 are arranged at intervals along the circumference of the stator core 2, the insulating sleeve 200 is provided in plurality, and the second sealing strip 300 is provided in plurality, one insulating sleeve 200 and one second sealing strip 300 are arranged in each stator slot 111 to achieve insulation of the winding 3 in each stator slot 111; the connecting ring is connected to the same end of the plurality of second sealing strips 300 in the axial direction of the stator core 2 to connect the plurality of second sealing strips 300 and the plurality of insulating sleeves 200 as a whole, facilitating installation of the stator 10 as a whole.

[0239] In an embodiment, the connecting ring comprises a first connecting ring 710 and a second connecting ring 720 arranged symmetrically, the first connecting ring 710 and the second connecting ring 720 are arranged along the circumference of the stator core 2 respectively, the first connecting ring 710 is connected to one end of the plurality of second sealing strips 300 in the axial direction of the stator core 2, and the second connecting ring 720 is connected to the other end of the plurality of second sealing strips 300 in the axial direction of the stator core 2 to fix the two ends of the plurality of second sealing strips 300, thereby improving the stability of installation of the plurality of second sealing strips 300.

[0240] In the stator 10 provided in the application, the first connecting ring 710 and / or the second connecting ring 720 can be integrally injection molded with the plurality of insulation sleeves 200 and the plurality of second sealing strips 300 and then loaded into the stator core 2 or integrally injection molded on the stator core 2, facilitating installation. The first connecting ring 710 and the second connecting ring 720 provide support for the plurality of second sealing strips 300 and the insulation sleeves 200, improving the overall structural strength.

[0241] In an embodiment, the first sub-sealing ring 610 abuts between the end surface of the first bus ring 4 along the axial direction of the stator core 2 and the end surface of the first connecting ring 710 along the axial direction of the stator core 2, and the second sub-sealing ring 620 abuts between the end surface of the second bus ring 5 along the axial direction of the stator core 2 and the end surface of the second connecting ring 720 along the axial direction of the stator core 2, to achieve radial sealing of the stator core 2.

[0242] Referring to FIGS. 35, 37 and 38, the first protruding edge 511 is arranged on the end surface of the first bus ring 4 along the axial direction of the stator core 2 and the end surface of the second bus ring 5 along the axial direction of the stator core 2, and the first protruding edge 511 is arranged in a ring shape and is spaced apart from the first connecting ring 710 or the second connecting ring 720 in the radial direction of the stator core 2; the first sub-sealing ring 610 abuts between the first protruding edge 511 and the first connecting ring 710, and the second sub-sealing ring 620 abuts between the first protruding edge 511 and the second connecting ring 720. In the application, the first sub-sealing ring 610 abuts the first end of the stator core 2 and the first bus ring 4 in the axial direction of the stator core 2, and the first sub-sealing ring 610 abuts the first protruding edge 511 and the first connecting ring 710 in the radial direction of the stator core 2, thereby achieving axial and radial sealing of the first bus ring 4 and the stator core 2; the second bus ring 5 abuts the second end of the stator core 2 and the second bus ring 5 in the axial direction of the stator core 2, and the second sub-sealing ring 620 abuts the first protruding edge 511 and the second connecting ring 720 in the radial direction of the stator core 2, thereby achieving axial and radial sealing of the second bus ring 5 and the stator core 2, further improving the sealing performance of the stator 10.

[0243] Referring to FIG. 39, compared with FIG. 38, the first connecting ring 710 is on the same plane as the second sealing strip 300 at one end of the stator core 2 in the axial direction, and the second connecting ring 720 is on the same plane as the second sealing strip 300 at the other end of the stator core 2 in the axial direction, so as to reduce the risk of breakage of the first connecting ring 710 and the second connecting ring 720 during transportation. The first bus ring 4 is provided with a third groove 512 along one end of the stator core 2 in the axial direction, and the second bus ring 5 is provided with a third groove 512 along one end of the stator core 2 in the axial direction; the first sub-sealing ring 610 is arranged in the third groove 512 on the first bus ring 4 and abuts against the first connecting ring 710 at one end of the stator core 2 in the axial direction; and the second sub-sealing ring 620 is arranged in the third groove 512 on the second bus ring 5 and abuts against the second connecting ring 720 at one end of the stator core 2 in the axial direction. By arranging the third groove 512 on the first bus ring 4 and the second bus ring 5, the installation firmness of the first sub-sealing ring 610 and the second sub-sealing ring 620 is improved, so as to improve the sealing performance of the stator 10.

[0244] Referring to FIG. 40, compared with FIG. 38, the first bus ring 4 is provided with a second protrusion 513 along one end of the stator core 2 in the axial direction, and the second bus ring 5 is provided with a second protrusion 513 along one end of the stator core 2 in the axial direction; the first connecting ring 710 is provided with a fourth groove 721 at one end of the stator core 2 in the axial direction, and the second connecting ring 720 is provided with a fourth groove 721 at one end of the stator core 2 in the axial direction; and the second protrusion 513 is arranged in the fourth groove 721. That is, the first bus ring 4 and the stator core 2, and the second bus ring 5 and the stator core 2 are sealed by the cooperation of the second protrusion 513 and the fourth groove 721. The second protrusion 513 can be directly and tightly matched with the fourth groove 721; or the first sub-sealing ring 610 is arranged in the fourth groove 721 on the first connecting ring 710 and abuts against the second protrusion 513, and the second sub-sealing ring 620 is arranged in the fourth groove 721 on the second connecting ring 720 and abuts against the second protrusion 513, so as to further improve the sealing performance of the first bus ring 4 and the stator core 2, and the second bus ring 5 and the stator core 2.

[0245] The vehicle can be a fuel automobile, an electric automobile, or a hybrid automobile. The vehicle can be a car, a truck, or a forklift, and the application does not limit this.

[0246] The vehicle 900 includes a body 910, wheels 920, and an electric powertrain 800. The body 910 serves as the supporting frame of the vehicle 900, supporting and connecting the various component assemblies of the vehicle 900. The wheels 920 are rotatably connected to the vehicle 900, and the number of wheels 920 can be two, three, or four; this application does not limit this.

[0247] The electric powertrain 800 is housed within the vehicle body and is connected to the wheels 920 via half-shafts. The electric powertrain 800 drives the wheels 920 to rotate, thereby propelling the vehicle 900. The electric powertrain 800 includes a motor and a reducer. The motor serves as the power source for the electric powertrain, providing power for the wheel rotation. The reducer connects the motor and the wheels, controlling the torque exerted by the motor on the wheels, thus controlling the wheel speed and ultimately the vehicle 900's travel speed.

[0248] The vehicle 900 also includes a cooling system comprising a hydraulic pump, a radiator, and piping, which are interconnected with the motor. Coolant flows through the piping; the coolant can be water or oil, and this application makes no limitation on this. Driven by the hydraulic pump, the coolant circulates between the motor and the radiator, thereby achieving a cooling cycle for the motor.

[0249] Please refer to Figure 41. The motor 100 includes a housing 1, a rotor (not shown in the figure), and a stator 10. The housing 1 serves as the supporting frame of the motor 100, used to support and connect the various components of the motor 100. The housing 1 can be rectangular, square, or other regular or irregular shapes, and this application does not impose any restrictions on this. The housing 1 has a mounting cavity 11.

[0250] The stator 10 is disposed within the mounting cavity 11. The stator 10 includes a stator core 2 and a winding 3. The stator core 2 is fixedly connected to the cavity wall of the mounting cavity 11. The stator core 2 has a first end face and a second end face that are disposed opposite to each other. A stator slot 111 is provided inside the stator core 2. The winding 3 is installed in the stator slot 111. The winding 3 has a first winding portion 31 protruding from the first end face and a second winding portion 32 protruding from the second end face. The winding 3 is connected to an external circuit through the first winding portion 31 and the second winding portion 32 to convert the electrical energy of the external circuit into magnetic energy and generate a first magnetic field.

[0251] The rotor is rotatably mounted inside the stator core 2. The rotor includes a shaft and a permanent magnet. The shaft is rotatably mounted inside the mounting cavity 11, with at least one end protruding outside the housing 1 for connection to the reducer. The permanent magnet is sleeved on the shaft and is used to generate a second magnetic field that can interact with the first magnetic field, thereby driving the shaft to rotate.

[0252] During operation, the motor 100's windings 3, especially the first winding portion 31 and the second winding portion 32 connected to the external circuit, generate a large amount of heat, which can affect the normal operation of the motor 100. To cool the motor 100, the motor 100's housing 1 is provided with a liquid inlet 12, which is connected to the mounting cavity 11.

[0253] The motor 100 also includes a bus ring 30, which is disposed on one side of the stator core 2 along the axial direction. The bus ring 30 is used to form a bus space 301. One or two bus rings 30 can be provided. When only one bus ring 30 is provided, it can be disposed on one side of the first end face of the stator core 2 or on one side of the second end face of the stator core 2. This application does not limit this. For example, in this application, the bus ring 30 includes a first bus ring 4 and a second bus ring 5. The first bus ring 4 is disposed on one side of the first end face of the stator core 2, forming a first bus space 41 between the first bus ring 4 and the first end face, and the first winding portion 31 is disposed within the first bus space 41. The second bus ring 5 is disposed on one side of the second end face of the stator core 2, forming a second bus space 51 between the second bus ring 5 and the second end face, and the second winding portion 32 is disposed within the second bus space 51.

[0254] The inlet 12 is connected to the first confluence space 41 and the second confluence space 51. Coolant can flow into the first confluence space 41 and the second confluence space 51 through the inlet 12. Under the action of the confluence of the first confluence space 41 and the second confluence space 51, the first winding section 31 and the second winding section 32 located in the first confluence space 41 and the second confluence space 51 are immersed, thereby reducing the temperature of the first winding section 31 and the second winding section 32.

[0255] However, in related technologies, after the coolant enters the first manifold space 41 and the second manifold space 51, it is easy for it to leak into the rotor at the first end face of the first manifold ring 4 and the stator core 2, or at the second end face of the second manifold ring 5 and the stator core 2, affecting the normal use of the rotor.

[0256] Referring to Figure 42, to solve the above problems, in this application, the bus ring 30 and the stator 10 are sealed together at one end face along the axial direction. The technical solution of this application provides a sealing structure between the end faces of the bus ring 30 and the stator 10, and uses this sealing structure to seal the connection between the stator 10 and the bus ring 30. This reduces the amount of coolant leakage between the stator 10 and the bus ring 30, reduces the impact of coolant leakage on the rotor, and improves the operational stability of the motor 100.

[0257] The sealing structure between the bus ring 30 and the stator 10 in this application will be described in detail below with reference to the accompanying drawings.

[0258] Please refer to Figures 43 and 44. The stator core 2 has stator slots 111, and the windings 3 are installed in the stator slots 111. The stator slots 111 can be closed slots as shown in Figure 43, or they can be open slots as shown in Figure 44, with an opening 112 on the radially inner side facing the stator core 2 (i.e., the side of the stator core 2 facing the rotor).

[0259] Please refer to Figure 45. When the stator slot 111 is a closed slot, in order to achieve the sealing between the bus ring 30 and the stator 10, in one embodiment of this application, the bus ring 30 has a contact surface 312. The contact surface 312 is disposed facing one end face of the stator 10 along the axial direction. The motor 100 also includes a first sealing ring 40, which is disposed between the contact surface 312 and the end face of the stator 10. The first sealing ring 40 is in contact with the contact surface 312 and the end face of the stator 10, thereby forming a seal between the contact surface 312 and the end face of the stator 10, thereby reducing the amount of coolant leakage between the stator 10 and the bus ring 30, reducing the impact of coolant leakage on the rotor, and improving the stability of the motor 100 operation.

[0260] Referring to Figure 46, to reduce the installation difficulty of the first sealing ring 40, in another possible embodiment of this application, the contact surface 312 is recessed away from the stator 10 to form a second groove 321. The first sealing ring 40 is disposed in the second groove 321. The second groove 321 is used to provide positioning for the first sealing ring 40, reducing the installation difficulty of the first sealing ring 40 between the contact surface 312 and the end face of the stator 10. The first sealing ring 40 contacts the groove wall surface of the second groove 321 and the end face of the stator 10, thereby forming a seal between the second groove 321 and the end face of the stator 10, thereby reducing the amount of coolant leakage between the stator 10 and the manifold 30, reducing the impact of coolant leakage on the rotor, and improving the operational stability of the motor 100.

[0261] Please refer to Figure 44. When the stator slot 111 is an open slot, to prevent the coolant in the confluence space 301 from flowing to the rotor through the opening 112 of the stator slot 111, the stator 10 in this application also includes a sealing element 120. The material of the sealing element 120 can be rubber, silicone, polytetrafluoroethylene, or polyimide, and this application does not limit this. The sealing element 120 has multiple first sealing strips 121, each of which is correspondingly disposed in each stator slot 111. The first sealing strips 121 are used to seal the opening 112 of the stator slot 111, thereby reducing the amount of coolant leakage from the stator slot 111 towards the rotor.

[0262] Please refer to Figure 47. In order to achieve the sealing between the bus ring 30 and the stator 10 when the stator slot 111 is an open slot, in one embodiment of this application, the bus ring 30 is provided with a plurality of protrusions 33 on the side facing the stator core 2. The protrusions 33 are spaced apart circumferentially along the bus ring 30. Each protrusion 33 extends into each stator slot 111 along the axial direction of the stator core 2. The protrusions 33 are sealed and connected to the first sealing strip 121. In this way, the leakage of coolant between the stator and the bus ring 30 is reduced, the impact of coolant leakage on the rotor is reduced, and the stability of the motor 100 operation is improved.

[0263] Please refer to Figure 48. There are various ways to seal the protrusion 33 and the first sealing strip 121. In one embodiment of this application, the protrusion 33 and the first sealing strip 121 are spaced apart along the axial direction of the stator core 2. The first sealing ring 40 of the motor 100 is disposed between the protrusion 33 and the first sealing strip 121 and is in contact with the protrusion 33 and the first sealing strip 121. In this way, a seal is formed between the protrusion 33 and the first sealing strip 121, thereby reducing the amount of coolant leakage at the connection between the protrusion 33 and the first sealing strip 121, reducing the impact of coolant leakage on the rotor, and improving the stability of the motor 100 operation.

[0264] Please refer to Figure 49. In another possible embodiment of this application, the first sealing strip 121 has a third protrusion 1211 on the side facing the protrusion 33, and the third protrusion 1211 contacts the protrusion 33. The protrusion 33 has a fourth protrusion 331 on the side facing the first sealing strip 121, and the fourth protrusion 331 contacts the first sealing strip 121. The fourth protrusion 331 and the third protrusion 1211 are arranged radially apart along the stator core 2. The first sealing ring 40 of the motor 100 is disposed between the third protrusion 1211 and the fourth protrusion 331. The third protrusion 1211 and the fourth protrusion 331 are used to provide positioning for the installation of the first sealing ring 40 between the first sealing strip 121 and the protrusion 33, thereby reducing the difficulty of installing the first sealing ring 40 between the first sealing strip 121 and the protrusion 33.

[0265] The first sealing ring 40 contacts the third protrusion 1211 and the fourth protrusion 331, thereby forming a seal between the protrusion 33 and the first sealing strip 121, thereby reducing the amount of coolant leakage at the connection between the protrusion 33 and the first sealing strip 121, reducing the impact of coolant leakage on the rotor, and improving the stability of motor 100 operation.

[0266] Please refer to Figure 50. In another embodiment of this application, the first sealing strip 121 is provided with a third protrusion 1211 on the side facing the protrusion 33. The third protrusion 1211 is in contact with the protrusion 33. The protrusion 33 is provided with a fourth protrusion 331 on the side facing the first sealing strip 121. The fourth protrusion 331 is in contact with the third protrusion 1211 to provide support for the third protrusion 1211 and improve the stability of the connection between the first sealing strip 121 and the protrusion 33. The fourth protrusion 331 and the first sealing strip 121 are spaced apart along the axial direction of the stator core 2. The first sealing ring 40 is disposed between the third protrusion 1211, the fourth protrusion 331 and the first sealing strip 121. The first sealing ring 40 is in contact with the third protrusion 1211 and the fourth protrusion 331, so as to form a seal between the protrusion 33 and the first sealing strip 121, thereby reducing the amount of coolant leakage at the connection between the protrusion 33 and the first sealing strip 121, reducing the impact of coolant leakage on the rotor, and improving the stability of the motor 100 operation.

[0267] Please refer to Figures 51 to 54. The protrusion 33 and the first sealing strip 121 can also be sealed by a tenon and mortise structure. Specifically, in one embodiment of this application, the first sealing strip 121 is provided with a tenon 35, and the protrusion 33 is provided with a recess 36. The tenon 35 of the first sealing strip 121 extends into the recess 36 of the protrusion 33. The recess 36 can compress the tenon 35 of the first sealing strip 121, thereby causing the first sealing strip 121 to undergo elastic deformation, thereby reducing the connection gap between the first sealing strip 121 and the protrusion 33, thus forming a seal between the protrusion 33 and the first sealing strip 121, reducing the amount of coolant leakage at the connection between the protrusion 33 and the first sealing strip 121, reducing the impact of coolant leakage on the rotor, and improving the stability of the motor 100 operation.

[0268] Understandably, in other possible embodiments of this application, the first sealing strip 121 may be provided with a recessed portion 36, and the protrusion 33 may be provided with a latching portion 35. The latching portion 35 of the protrusion 33 may compress the recessed portion 36 of the first sealing strip 121, thereby reducing the connection gap between the first sealing strip 121 and the protrusion 33, reducing the amount of coolant leakage at the connection between the protrusion 33 and the first sealing strip 121, reducing the impact of coolant leakage on the rotor, and improving the stability of the motor 100 operation.

[0269] Please refer to Figure 51. The cross-sectional shape of the tenon 35 and the recess 36 along the axis perpendicular to the stator core 2 can be set as a triangle. Triangles have stability, and the tenon 35 and the recess 36 set as triangles can have better connection stability.

[0270] Please refer to Figure 52. The cross-sectional shape of the tenon 35 and the recess 36 along the vertical axis of the stator core 2 can also be set as a circle. The smooth surface of the circle can reduce the installation difficulty of the first sealing strip 121 and the protrusion 33 and improve the installation efficiency of the first sealing strip 121 and the protrusion 33.

[0271] Please refer to Figure 53. The cross-sectional shape of the tenon 35 and the recess 36 along the vertical axis of the stator core 2 can also be set as rectangular. Rectangular shapes are easy to process and have a large surface area, which can effectively reduce the processing cost of the first sealing strip 121 and the protrusion 33, increase the contact area 312 of the first sealing strip 121 and the protrusion 33, and improve the sealing effect of the first sealing strip 121 and the protrusion 33.

[0272] Please refer to Figure 54. The cross-sectional shape of the tenon 35 and the recess 36 along the axis perpendicular to the stator core 2 can also be set to ellipse. The ellipse shape can provide better adaptability for the tenon 35 and the recess 36 when connected, reduce stress concentration, and extend the service life of the tenon 35 and the recess 36.

[0273] In addition to the busbar 30 extending into the stator groove 111 and connecting with the seal 120, the seal 120 can also extend out of the stator groove 111 and be sealed to the busbar 30. Specifically, referring to Figures 55 to 57, in one embodiment of this application, the seal 120 further includes a sealing ring 122, and a first sealing strip 121 is disposed on one end face of the sealing ring 122 to connect with the sealing ring 122, and each first sealing strip 121 is spaced apart circumferentially along the sealing ring 122. The first sealing strip 121 extends into the stator groove 111 to seal the opening 112 of the stator groove 111.

[0274] The sealing ring 122 extends out of the stator slot 111 and contacts the end face of the stator core 2. The bus ring 30 is sealed to the sealing ring 122. This reduces the amount of coolant leakage between the stator and the bus ring 30, reduces the impact of coolant leakage on the rotor, and improves the stability of the motor 100 operation.

[0275] Please refer to Figure 58. There are various ways to seal the connection between the bus ring 30 and the sealing ring 122. In one embodiment of this application, the bus ring 30 and the sealing ring 122 are arranged radially at intervals along the stator core 2. The first sealing ring 40 of the motor 100 is disposed between the bus ring 30 and the sealing ring 122. The first sealing ring 40 is in contact with the bus ring 30 and the sealing ring 122. In this way, the leakage of coolant at the connection between the sealing ring 122 and the bus ring 30 is reduced, the impact of coolant leakage on the rotor is reduced, and the stability of the motor 100 operation is improved.

[0276] Referring to Figure 59, in another possible embodiment of this application, the bus ring 30 has an annular protrusion 34 on the side facing the stator core 2, and the annular protrusion 34 contacts the stator core 2; the annular protrusion 34 and the sealing ring 122 are arranged radially spaced apart along the stator core 2, and the first sealing ring 40 is disposed between the annular protrusion 34 and the sealing ring 122, and contacts the stator core 2, the annular protrusion 34 and the outer radial side of the sealing ring 122. The annular protrusion 34 is used to provide positioning for the first sealing ring 40 between the bus ring 30 and the sealing ring 122, thereby reducing the installation difficulty of the first sealing ring 40 between the bus ring 30 and the sealing ring 122.

[0277] The first sealing ring 40 contacts the stator core 2 and the annular protrusion 34, thereby forming a seal between the bus ring 30 and the sealing ring 122, which reduces the amount of coolant leakage at the connection between the sealing ring 122 and the bus ring 30, reduces the impact of coolant leakage on the rotor, and improves the stability of the motor 100 operation.

[0278] Please refer to Figure 60. In another embodiment of this application, the bus ring 30 is provided with an annular protrusion 34 on the side facing the stator core 2. The annular protrusion 34 contacts the radial outer side of the sealing ring 122 to provide support for the connection between the sealing ring 122 and the bus ring 30, thereby improving the stability of the connection between the sealing ring 122 and the bus ring 30.

[0279] The annular protrusion 34 and the end face of the stator core 2 are spaced apart along the axial direction of the stator core 2. The motor 100 also includes a first sealing ring 40, which is disposed between the annular protrusion 34, the sealing ring 122, and the stator core 2, and is in contact with the annular protrusion 34, the sealing ring 122, and the stator core 2. In this way, a seal is formed between the sealing ring 122 and the busbar ring 30, thereby reducing the amount of coolant leakage at the connection between the sealing ring 122 and the busbar ring 30, reducing the impact of coolant leakage on the rotor, and improving the operational stability of the motor 100.

[0280] Understandably, the sealing connection methods of all the above-mentioned manifold 30 and seal 120 should also apply when the stator groove 111 is a closed groove.

[0281] Please refer to Figures 61 and 62. The motor 100 includes a housing 1, a rotor (not shown in the figures), and a stator. The housing 1 serves as the supporting frame of the motor 100, used to support and connect the various components of the motor 100. The housing 1 can be rectangular, square, or other regular or irregular shapes; this application does not impose any restrictions on this. The housing 1 has a mounting cavity 11.

[0282] The stator is disposed within the mounting cavity 11. The stator includes a stator core 2 and a winding 3. The stator core 2 is fixedly connected to the cavity wall of the mounting cavity 11. The stator core 2 has a first end face and a second end face that are disposed opposite to each other. A stator slot is provided within the stator core 2, and the winding 3 is installed within the stator slot. The winding 3 has a first winding portion 31 protruding from the first end face and a second winding portion 32 protruding from the second end face. The winding 3 is connected to an external circuit through the first winding portion 31 and the second winding portion 32 to convert the electrical energy of the external circuit into magnetic energy and generate a first magnetic field.

[0283] The rotor is rotatably mounted inside the stator core 2. The rotor includes a shaft and a permanent magnet. The shaft is rotatably mounted inside the mounting cavity 11, with at least one end protruding outside the housing 1 for connection to the reducer. The permanent magnet is sleeved on the shaft and is used to generate a second magnetic field that can interact with the first magnetic field, thereby driving the shaft to rotate.

[0284] During operation, the motor 100's windings 3, especially the first winding portion 31 and the second winding portion 32 connected to the external circuit, generate a large amount of heat, which can affect the normal operation of the motor 100. To cool the motor 100, the motor 100's housing 1 is provided with a liquid inlet 12, which is connected to the mounting cavity 11.

[0285] The motor 100 also includes a first bus ring 4 and a second bus ring 5. The first bus ring 4 is disposed on one side of the first end face of the stator core 2, and the second bus ring 5 is disposed on one side of the second end face of the stator core 2. The area between the first bus ring 4 and the first end face forms a first bus space 41, and the area between the second bus ring 5 and the second end face forms a second bus space 51. The first winding portion 31 is disposed in the first bus space 41, and the second winding portion 32 is disposed in the second bus space 51.

[0286] In related technologies, the first confluence space 41 and the second confluence space 51 are provided with liquid inlets 12, and coolant can enter the first confluence space 41 and the second confluence space 51 through the liquid inlets 12, thereby completing the immersion and cooling of the first winding portion 31 and the second winding portion 32 in the first confluence space 41 and the second confluence space 51.

[0287] However, this heat dissipation method can only dissipate heat from the windings, but it lacks an effective means of dissipating heat from the stator core 2, which also has heat accumulation.

[0288] To solve the above problems, in this application, the motor 100 also has a first external flow channel 7 and an internal flow channel 6. The internal flow channel 6 is disposed on the stator core 2 and passes through the first end face and the second end face. The first external flow channel 7 extends along the axial direction of the stator core 2. The liquid inlet 12 is connected to the first confluence space 41 through the first external flow channel 7.

[0289] The technical solution of this application provides a first outer flow channel 7 and an inner flow channel 6 in the motor 100. The first outer flow channel 7 is formed by the housing 1 or by the housing 1 and the stator core 2, and the inner flow channel 6 is formed by the stator core 2. Coolant can flow into the first confluence space 41 through the inlet 12 and the first outer flow channel 7, and into the second confluence space 51 through the inner flow channel 6, thereby cooling the first winding portion 31 and the second winding portion 32 in the first confluence space 41 and the second confluence space 51. At the same time, when the coolant flows through the first outer flow channel 7 and the inner flow channel 6, the coolant can come into contact with the housing 1 and the stator core 2 that constitute the first outer flow channel 7 and the inner flow channel 6, and carry away the heat from the surface of the housing 1 and the stator core 2, thereby cooling the housing 1 and the stator core 2. In this way, while cooling the windings, cooling the housing 1 and the stator core 2 is also achieved, improving the cooling effect of the coolant on the motor 100.

[0290] The cooling channel of the motor 100 of this application will be described in detail below with reference to the accompanying drawings.

[0291] Please refer to Figures 61 and 62. The motor 100 has a liquid inlet 12, a first manifold space 41, and a second manifold space 51. The liquid inlet 12 is formed on the housing 1. One end of the liquid inlet 12 is connected to the hydraulic pump, and the other end is connected to the mounting cavity 11. Coolant can flow into the motor 100 from the liquid inlet 12.

[0292] A first confluence space 41 is formed between a first confluence ring 4 and a first end face, and a second confluence space 51 is formed between a second confluence ring 5 and a second end face. The first confluence space 41 houses a first winding portion 31, and the second confluence space 51 houses a second winding portion 32. Coolant can flow into the first confluence space 41 and the second confluence space 51 from the inlet 12. The first confluence space 41 and the second confluence space 51 are used to converge the coolant, thereby increasing the contact area between the coolant and the first winding portion 31 and the second winding portion 32, prolonging the contact time between the coolant and the first winding portion 31 and the second winding portion 32, and improving the cooling effect of the coolant on the first winding portion 31 and the second winding portion 32.

[0293] The motor 100 also has a first external flow channel 7, which is connected between the liquid inlet 12 and the first confluence space 41. Coolant can flow into the first confluence space 41 through the liquid inlet 12 and the first external flow channel 7. At the same time, when the coolant flows through the first external flow channel 7, the coolant can come into contact with the housing 1 or the stator core 2 that constitute the first external flow channel 7, thereby carrying away the heat of the housing 1 and the stator core 2.

[0294] There are several ways in which the motor 100 forms the first external flow channel 7. Please refer to Figure 61. In one embodiment of this application, the stator core 2 and the cavity wall of the mounting cavity 11 are spaced apart, and the outer peripheral surface of the stator core 2 and the inner wall of the mounting cavity 11 of the housing 1 surround each other to form the first external flow channel 7. With this arrangement, on the one hand, the spaced-apart arrangement between the stator core 2 and the cavity wall of the mounting cavity 11 can reduce the installation difficulty of the stator core 2 and the mounting cavity 11 and improve the assembly efficiency of the stator core 2 and the housing 1. On the other hand, when the coolant flows into the first confluence space 41 from the first external flow channel 7, the coolant can simultaneously contact the housing 1 and the stator core 2, and simultaneously carry away the heat of the housing 1 and the stator core 2, thereby improving the heat dissipation efficiency of the coolant for the motor 100.

[0295] Referring to Figure 62, in another possible embodiment of this application, the first external flow channel 7 can also be formed solely by the housing 1. Specifically, in this embodiment, the housing 1 has a sandwich layer that forms the first external flow channel 7, and the first external flow channel 7 and the mounting cavity 11 are spaced apart. This arrangement, on the one hand, forms an independent heat dissipation channel because the first external flow channel 7 and the mounting cavity 11 are spaced apart. This means that when the coolant flows through the first external flow channel 7, it can focus on dissipating heat from the housing 1 without being disturbed by other components within the mounting cavity 11, thereby improving the heat dissipation efficiency of the housing 1. On the other hand, since there is no longer a gap between the housing 1 and the stator core 2 to form the first external flow channel 7, the inner wall of the housing 1 and the stator core 2 can be completely fitted together in this structure, thereby reducing the structural weakening caused by gaps or voids between the stator core 2 and the housing 1, and thus enhancing the structural strength of the housing 1. Simultaneously, the fitted arrangement of the housing 1 and the stator core 2 also indirectly reduces the thermal resistance between the housing 1 and the stator core 2. The heat generated by the stator core 2 can be transferred to the housing 1 more effectively and dissipated quickly through the coolant in the first external flow channel 7, thereby improving the heat dissipation performance of the motor 100.

[0296] Referring to Figure 63, in one embodiment of this application, the inlet 12 is connected to the second confluence space 51 via the first outflow channel 7. When coolant flows into the mounting cavity 11 from the inlet 12, a portion of the coolant flows into the first confluence space 41 through the first outflow channel 7 on one side, while the other portion flows into the second confluence space 51 through the first outflow channel 7 on the other side. This portion of coolant mixes with the high-temperature coolant in the second confluence space 51, thereby further reducing the temperature difference between the first and second confluence spaces 41 and improving the uniformity of heat dissipation from the coolant to the winding 3.

[0297] When the first external flow channel 7 is connected to the first confluence space 41 and the second confluence space 51, the inlet 12 is located in the middle of the first external flow channel 7. It should be noted that "middle" refers to a distance A1 between the axis of the inlet 12 and the side of the first confluence ring 4 facing the inlet 12, and a distance B1 between the axis of the inlet 12 and the side of the second confluence ring 5 facing the inlet 12. When the absolute value of A1-B1 is 0 ≤ |A1-B1| ≤ 2 mm, the inlet 12 is located in the middle of the first external flow channel 7. At this time, the flow rate of coolant from the inlet 12 into the first confluence space 41 and the second confluence space 51 remains relatively balanced. This reduces the temperature difference between the coolant in the first confluence space 41 and the second confluence space 51, improving the uniformity of heat dissipation from the coolant to the winding 3. Specifically, when A1 = B1, the temperature difference between the coolant in the first confluence space 41 and the second confluence space 51 is minimized, and the heat dissipation uniformity of the winding 3 is optimal.

[0298] The motor 100 also has an inner flow channel 6, which is disposed in the stator core 2 and extends through the first end face and the second end face. The coolant in the first confluence space 41 can flow to the second confluence space 51 through the inner flow channel 6. The inner flow channel 6 increases the contact area between the coolant and the stator core 2. When the coolant flows to the second confluence space 51 through the inner flow channel 6, the coolant can come into contact with the stator core 2 constituting the inner flow channel 6 and carry away the heat of the stator core 2, thereby improving the heat dissipation effect of the coolant on the stator core 2. On the other hand, when the coolant flows from the inlet 12 through the first outer flow channel 7 to the first confluence space 41 and the second confluence space 51 respectively, since the inlet 12 is located in the middle of the first outer flow channel 7, under ideal conditions, the coolant is usually evenly distributed in the first confluence space and the second confluence space. However, in actual operation, due to limitations in the machining accuracy of the motor 100 or the assembly accuracy of the motor 100 and the pipeline, the coolant often cannot be evenly distributed into the first confluence space 41 and the second confluence space 51 after flowing out of the inlet 12. This also leads to differences in the flow rate of coolant between different confluence rings, thereby affecting the uniformity of coolant cooling of the stator of the motor 100 and the cooling effect of the coolant.

[0299] The inner flow channel 6 allows the first confluence space 41 and the second confluence space 51 to be interconnected. Coolant in the first confluence space 41 can flow into the second confluence space 51 via the inner flow channel 6, and coolant in the second confluence space 51 can also flow back into the first confluence space 41 via the inner flow channel 6. This balances the coolant flow rate between the first confluence space 41 and the second confluence space 51, improving the uniformity of heat dissipation from the coolant to the first winding section 31 and the second winding section 32, and enhancing the cooling effect of the coolant.

[0300] The inner flow channel 6 can be provided as one or more, and this application does not limit this. Referring to Figure 64, in one embodiment of this application, the inner flow channel 6 is provided as one, and the first outer flow channel 7 connects to the seventh position of the first confluence space 41; the inner flow channel 6 connects to the eighth position of the first confluence space 41. The seventh and eighth positions are spaced apart along the circumference of the first confluence space 41, and the arc connecting the seventh and eighth positions along the circumference of the first confluence space 41 is C1, where 8π / 9≤C1≤8π / 7. The connection position between the first outer flow channel 7 and the first confluence space 41 is diagonally or nearly diagonally opposite to the connection position between the inner flow channel 6 and the first confluence space 41. This ensures that after the coolant flows into the first confluence space 41 from the first outer flow channel 7, the coolant must flow throughout the entire first confluence space 41 before flowing into the second confluence space 51 from the inner flow channel 6. This increases the residence time of the coolant in the first confluence space 41, thereby improving the cooling effect of the coolant on the first winding section 31.

[0301] Referring to Figure 65, to further improve the cooling effect of the coolant on the winding 3, the motor 100 is also provided with a second outlet 52, from which the coolant can flow out of the second manifold ring 5. The second outlet 52 is connected to the ninth position of the second manifold space 51, and the inner flow channel 6 is connected to the tenth position of the second manifold space 51. The ninth and tenth positions are spaced apart along the circumference of the second manifold space 51, and the arc of the line connecting the ninth and tenth positions along the circumference of the second manifold space 51 is D, where 8π / 9≤D≤8π / 7. The connection position between the inner flow channel 6 and the second manifold space 51 is diagonally or nearly diagonally opposite to the connection position between the second outlet 52 and the second manifold space 51. This ensures that after the coolant flows into the second manifold space 51 from the inner flow channel 6, the coolant must flow throughout the entire second manifold space 51 before flowing out of the second manifold space 51 from the second outlet 52. This increases the residence time of the coolant in the second confluence space 51, thereby improving the cooling effect of the coolant on the second winding section 32.

[0302] Referring to Figure 66, it can be understood that in other possible embodiments of this application, the inner flow channels 6 can also be configured as multiple channels. Specifically, referring to Figure 65, in this embodiment, the stator core 2 is provided with multiple inner flow channels 6, which are spaced apart circumferentially along the stator core 2. The coolant in the first confluence space 41 can flow into the second confluence space 51 in various directions of the stator core 2, thereby increasing the flow velocity of the coolant into the second confluence space 51, increasing the flow velocity of the coolant in the first confluence space 41 and the second confluence space 51, and improving the heat dissipation effect of the coolant on the motor 100. At the same time, the multiple inner flow channels 6 can also increase the contact area between the coolant and the stator core 2, improving the heat dissipation effect of the coolant on the stator core 2.

[0303] Referring to Figure 67, the motor 100 also has a second external flow channel 8, which is formed between the stator core 2 and the cavity wall of the mounting cavity 11. The second external flow channel 8 connects to the liquid inlet 12. Coolant can flow into the second external flow channel 8 through the liquid inlet 12 and the first external flow channel 7. The second external flow channel 8 can be formed by the stator core 2 recessed towards the side away from the cavity wall of the mounting cavity 11, or by the cavity wall of the mounting cavity 11 recessed towards the side away from the stator core 2; this application does not limit this. In one embodiment of this application, the outer circumference of the stator core 2 is recessed inward to form a first groove 611, and the first groove 611 and the cavity wall of the mounting cavity 11 surround to form the second external flow channel 8. This arrangement avoids the need to open the first groove 611 on the housing 1, which would affect the supporting strength of the housing 1. On the other hand, the first groove 611 can increase the contact area between the coolant and the stator core 2, improving the cooling effect of the coolant on the stator core 2.

[0304] Please refer to Figure 68. In one embodiment of this application, the first groove extends circumferentially along the stator core 2, so that the coolant can flow along the entire circumference of the stator core 2, thereby increasing the contact area between the coolant and the stator core 2 and improving the cooling effect of the coolant on the stator core 2.

[0305] Please refer to Figure 69. A protrusion 81 is provided in the first groove 611. The protrusion 81 is used to divert the coolant flowing in the second outer channel 8. This increases the disturbance of the coolant in the second outer channel 8, forms turbulence in the coolant in the second outer channel 8, increases the contact area between the coolant and the stator core 2, and improves the heat dissipation effect of the coolant on the stator core 2.

[0306] In one embodiment of this application, the protrusion 81 includes a first protrusion 811 and a second protrusion 812, which are staggered along the axial direction of the stator core 2. The staggered arrangement of the first protrusion 811 and the second protrusion 812 can more effectively disrupt the laminar flow state of the coolant, resulting in more complex turbulence within the coolant and enhancing the rate and efficiency of heat transfer.

[0307] Referring to Figure 70, the motor 100 also has a third external flow channel 9, which is formed by the stator core 2 facing away from the first external flow channel 7 and the cavity wall of the mounting cavity 11. The third external flow channel 9 can be formed by the outer peripheral surface of the stator core 2 and the cavity wall of the mounting cavity 11, or it can be formed by the concave surface of the stator core 2 after radial indentation and the cavity wall of the mounting cavity 11. This application does not limit this. The second external flow channel 8 is connected to the first confluence space 41 through the third external flow channel 9. The coolant can flow into the first confluence space 41 through the inlet 12, the first external flow channel 7, the second external flow channel 8, and the third external flow channel 9. In this way, while further increasing the contact area between the coolant and the stator core 2, the cooling circulation of the coolant in the second external flow channel 8 and the first confluence space 41 is realized.

[0308] The second external flow channel 8 can also be connected to the second confluence space 51 through the third external flow channel 9. The coolant can flow into the second confluence space 51 through the inlet 12, the first external flow channel 7, the second external flow channel 8, and the third external flow channel 9. In this way, the cooling circulation of the coolant in the second external flow channel 8 and the first confluence space 41 can also be realized.

[0309] Understandably, in other possible embodiments of this application, the second external flow channel 8 may also be connected to the first confluence space 41 and the second confluence space 51 simultaneously through the third external flow channel 9. In this way, the coolant flow rate of the first confluence space 41 and the second confluence space 51 can be balanced, the coolant temperature difference between the first confluence space 41 and the second confluence space 51 can be reduced, the cooling uniformity of the coolant on the first winding section 31 and the second winding section 32 can be improved, and the cooling effect of the coolant on the motor 100 can be improved.

[0310] Please refer to Figure 71. The motor 100 includes a housing 1, a rotor, and a stator. The housing 1 serves as the supporting frame of the motor 100, used to support and connect the various components of the motor 100. The housing 1 can be rectangular, square, or other regular or irregular shapes; this application does not impose any restrictions on this. The housing 1 has a mounting cavity 11.

[0311] The stator is disposed within the mounting cavity 11. The stator includes a stator core 2 and a winding 3. The stator core 2 is fixedly connected to the cavity wall of the mounting cavity 11. The stator core 2 has a first end face and a second end face that are axially opposite to each other. A stator slot is provided within the stator core 2, and the winding 3 is installed within the stator slot. The winding 3 has a first winding portion 31 protruding from the first end face and a second winding portion 32 protruding from the second end face. The winding 3 is connected to an external circuit through the first winding portion 31 and the second winding portion 32 to convert the electrical energy of the external circuit into magnetic energy and generate a first magnetic field.

[0312] The rotor is rotatably mounted inside the stator. The rotor includes a shaft and a permanent magnet. The shaft is rotatably mounted inside the mounting cavity 11, with at least one end protruding outside the housing 1 for connection to the reducer. The permanent magnet is sleeved on the shaft and is used to generate a second magnetic field that can interact with the first magnetic field, thereby driving the shaft to rotate.

[0313] During operation, the motor 100's windings 3, especially the first winding portion 31 and the second winding portion 32 connected to the external circuit, generate a large amount of heat, which can affect the normal operation of the motor 100. To cool the motor 100, the motor 100's housing 1 is provided with a liquid inlet 12, which is connected to the mounting cavity 11.

[0314] The motor 100 also includes a first bus ring 4 and a second bus ring 5. The first bus ring 4 is disposed on one side of the first end face of the stator core 2, and the second bus ring 5 is disposed on one side of the second end face of the stator core 2. The area between the first bus ring 4 and the first end face forms a first bus space 41, and the area between the second bus ring 5 and the second end face forms a second bus space 51. The first winding portion 31 is disposed in the first bus space 41, and the second winding portion 32 is disposed in the second bus space 51.

[0315] In related technologies, coolant can flow into the first and second confluence spaces through the inlet, and under the confluence of the first and second confluence spaces, it wets the first winding portion in the first confluence space and the second winding portion in the second confluence space, thereby reducing the temperature of the first and second winding portions and improving the stability of motor operation.

[0316] However, this heat dissipation method can only dissipate heat from the winding 3, but it lacks effective heat dissipation methods for the stator core 2, which also has heat accumulation, and the motor housing.

[0317] To address the aforementioned issues, in this application's technical solution, the motor 100 further includes an external flow channel 70, which is disposed between the stator core 2 and the cavity wall of the mounting cavity 11. The inlet 12 is interconnected with the external flow channel. In this application's technical solution, the motor 100's housing 1 and stator core 2 form the external flow channel 70. Coolant can flow into the first manifold 4 and the second manifold 5 via the inlet 12 and the external flow channel 70. During the flow of the coolant through the external flow channel 70, the coolant comes into contact with the housing 1 and stator core 2 constituting the external flow channel 70, carrying away heat from the surfaces of the housing 1 and stator core 2, thus cooling the housing 1 and stator core 2. After cooling the stator core 2, the coolant flows into the first manifold 4 and the second manifold 5, thereby cooling the first winding portion 31 and the second winding portion 32 within the first manifold 4 and the second manifold 5. In this way, while cooling the winding 3, the cooling of the housing 1 and the stator core 2 is also achieved, thereby improving the cooling effect of the coolant on the motor 100.

[0318] The cooling channel of the motor 100 of this application will be described in detail below with reference to the accompanying drawings.

[0319] The motor 100 has a liquid inlet 12, a first manifold space 41, and a second manifold space 51. The liquid inlet 12 is formed on the housing 1, with one end connected to a hydraulic pump and the other end connected to the mounting cavity 11. Coolant can flow into the motor 100 from the liquid inlet 12.

[0320] A first confluence space 41 is formed between a first confluence ring 4 and a first end face, and a second confluence space 51 is formed between a second confluence ring 5 and a second end face. The first confluence space 41 houses a first winding portion 31, and the second confluence space 51 houses a second winding portion 32. Coolant can flow into the first confluence space 41 and the second confluence space 51 from the inlet 12. The first confluence space 41 and the second confluence space 51 are used to converge the coolant, thereby increasing the contact area between the coolant and the first winding portion 31 and the second winding portion 32, prolonging the contact time between the coolant and the first winding portion 31 and the second winding portion 32, and improving the cooling effect of the coolant on the first winding portion 31 and the second winding portion 32.

[0321] The motor 100 also has an outer flow channel 70, which is formed by the cavity wall of the mounting cavity 11 of the housing 1 and the outer peripheral surface of the stator core 2. The outer flow channel 70 is connected to the liquid inlet 12, the first confluence space 41, and the second confluence space 51. Coolant can flow into the first confluence space 41 and the second confluence space 51 through the liquid inlet 12 and the outer flow channel 70. During the flow of the coolant through the outer flow channel 70, the coolant can come into contact with the stator core 2 and the housing 1 that constitute the outer flow channel 70, and carry away the heat of the stator core 2 and the housing 1, thereby reducing the temperature of the housing 1 and the stator core 2 and achieving heat dissipation for the housing 1 and the stator core 2 of the motor 100.

[0322] The external flow channel 70 can extend axially along the stator core 2, or it can extend both circumferentially and axially along the stator core 2; this application does not impose any limitation on this. In one embodiment of this application, the external flow channel 70 includes a second external flow channel 8 and a third external flow channel 9. The second external flow channel 8 extends circumferentially along the stator core 2, and the third external flow channel 9 extends axially along the stator core 2. The liquid inlet 12 is connected to the third external flow channel 9 via the second external flow channel 8. The third external flow channel 9 is connected to the first confluence space 41 and the second confluence space 51. The staggered arrangement of the second external flow channel 8 and the third external flow channel 9 increases the complexity of the coolant flow path within the motor 100, increases the contact area between the coolant and the stator core 2 and the housing 1, improves the uniformity of heat dissipation from the coolant to the motor 100, and enhances the heat dissipation effect of the coolant on the motor 100.

[0323] Please refer to Figure 72. There are various ways to form the second external flow channel 8. The second external flow channel 8 can be formed by the stator core 2 recessed towards the side opposite to the cavity wall of the mounting cavity 11, or it can be formed by the cavity wall of the mounting cavity 11 recessed towards the side opposite to the stator core 2. This application does not limit this. In one possible embodiment of this application, the outer circumference of the stator core 2 is recessed inward to form a first groove 611. The first groove 611 and the cavity wall of the mounting cavity 11 surround and form the second external flow channel 8. This arrangement avoids the need to create the first groove 611 on the housing 1, which would affect the supporting strength of the housing 1. Furthermore, the first groove 611 increases the contact area between the coolant and the stator core 2, improving the cooling effect of the coolant on the stator core 2.

[0324] In one embodiment of this application, the first groove 611 is arranged around the circumference of the stator core 2, so that the coolant can flow along the entire circumference of the stator core 2, thereby increasing the contact area between the coolant and the stator core 2 and improving the cooling effect of the coolant on the stator core 2.

[0325] Please refer to Figure 73. In one embodiment of this application, a plurality of protrusions 81 are provided on the outer peripheral surface of the stator core 2. The plurality of protrusions 81 are disposed in the second outer flow channel 8. The protrusions 81 are used to divert the coolant, thereby increasing the disturbance of the coolant flow in the second outer flow channel 8, improving the formation of turbulence in the second outer flow channel 8, increasing the contact area between the coolant and the stator core 2, and improving the heat dissipation effect of the coolant on the stator core 2.

[0326] In one embodiment of this application, the protrusion 81 includes a first protrusion ring 613 and a second protrusion ring 614 arranged along the axial direction of the stator core 2. The first protrusion ring 613 includes a plurality of second protrusions 812 spaced apart along the circumference of the stator core 2; the second protrusion ring 614 includes a plurality of first protrusions 811 spaced apart along the circumference of the stator core 2; the second protrusions 812 in the first protrusion ring 613 and the first protrusions 811 in the second protrusion ring 614 are staggered. The staggered arrangement of the second protrusions 812 and the first protrusions 811 can more effectively disrupt the laminar flow state of the coolant, resulting in more complex turbulence within the coolant, thereby enhancing the rate and efficiency of heat transfer of the coolant.

[0327] Referring to Figure 71, the third external flow channel 9 is formed between the stator core 2 and the cavity wall of the mounting cavity 11. The third external flow channel 9 can be formed by a recess in the stator core 2 or by a recess in the cavity wall of the mounting cavity 11; this application does not impose any limitation on this. The third external flow channel 9 has a first end and a second end disposed opposite to each other, and a third end disposed between the first end and the second end. The first end of the third external flow channel 9 is connected to the first confluence space 41, the second end of the third external flow channel 9 is connected to the second confluence space 51, and the third end of the third external flow channel 9 is connected to the second external flow channel 8. The third external flow channel 9 is used to guide the coolant of the second external flow channel 8 to the first confluence space 41 and the second confluence space 51, thereby achieving cooling of the first winding portion 31 and the second winding portion 32 within the first confluence space 41 and the second confluence space 51.

[0328] In one embodiment of this application, the liquid inlet 12 is located on one side of the mounting cavity 11 along a first direction, and the third external flow channel 9 is located on the other side of the mounting cavity 11 along the first direction. The first direction can be a front-back direction, a left-right direction, or a top-bottom direction; this application does not limit this. For example, in this application, the first direction is top-bottom, the liquid inlet 12 is connected to the upper cavity wall of the mounting cavity 11, and the third external flow channel 9 is located at the lower cavity wall of the mounting cavity 11. This maximizes the distance between the liquid inlet 12 and the third external flow channel 9, thereby extending the flow distance of the coolant along the second external flow channel 8, increasing the contact area between the coolant and the stator core 2, and improving the cooling effect of the coolant on the stator core 2.

[0329] In one embodiment of this application, the second external flow channel 8 is connected to the middle of the third external flow channel 9. It should be noted that, assuming that the distance from the axis of the second connection port of the second external flow channel 8 and the third external flow channel 9 to the first manifold 4 facing the second external flow channel 8 is D, and the distance from the axis of the second connection port of the second external flow channel 8 and the third external flow channel 9 to the second manifold 5 facing the second external flow channel 8 is E, and the absolute value of DE is 0≤|DE|≤2mm, then it is said that the second external flow channel 8 and the third external flow channel 9 are connected to the middle. At this time, the flow rates of coolant flowing into the first confluence space 41 and the second confluence space 51 through the second external flow channel 8 and the third external flow channel 9 can be regarded as equal, so as to improve the uniformity of coolant in the first confluence space 41 and the second confluence space 51, improve the heat dissipation uniformity of the coolant to the first winding section 31 and the second winding section 32, and improve the heat dissipation effect of the coolant to the first winding section 31 and the second winding section 32.

[0330] Understandably, the third external flow channel 9 can be formed at various locations within the mounting cavity 11. To improve the cooling effect of the coolant on the motor 100, please refer to Figure 74. In one embodiment of this application, the inlet 12 is connected to a first location within the mounting cavity 11; the third external flow channel 9 is located at a second location within the mounting cavity 11. The circumferential arc of the first and second locations within the mounting cavity 11 is A, where 8π / 9 ≤ A ≤ 8π / 7. Under this positional size constraint, the inlet 12 and the third external flow channel 9 are positioned diagonally or nearly diagonally within the mounting cavity 11. When the coolant flows into the mounting cavity 11 through the inlet 12, the coolant needs to flow throughout the entire mounting cavity 11 before flowing into the first confluence space 41 and the second confluence space 51 through the third external flow channel 9. This increases the residence time of the coolant within the mounting cavity 11, improving the cooling effect of the coolant on the housing 1 and the stator core 2.

[0331] The motor 100 also includes a first outlet 42 and a second outlet 52. The first outlet 42 is located in the first confluence space 41, and the second outlet 52 is located in the second confluence space 51. Coolant can flow into the first confluence space 41 from the inlet 12 and the outer flow channel 70, and then flow out of the motor 100 from the first outlet 42. Alternatively, coolant can flow into the first confluence space 41 from the inlet 12 and the outer flow channel 70, and then flow out of the motor 100 from the first outlet 42. The arrangement of the first outlet 42 and the second outlet 52 can accelerate the outward discharge speed of coolant, improve the uniformity of coolant flow within the first confluence space 41 and the second confluence space 51, and enhance the cooling effect of the coolant on the motor 100.

[0332] Referring to Figure 75, to improve the cooling effect on the winding 3, in one embodiment of this application, the third external flow channel 9 is connected to the third position of the first confluence space 41, and the first outlet 42 is located at the fourth position of the first confluence space 41. The third position and the fourth position are spaced apart along the circumference of the first confluence space 41, and the arc of the line connecting the third position and the fourth position along the circumference of the first confluence space 41 is B, where 8π / 9 ≤ B ≤ 8π / 7. Under this positional size constraint, the relative positions of the third external flow channel 9 and the first outlet 42 within the first confluence space 41 can be diagonally or nearly diagonally arranged. After the coolant flows into the first confluence space 41 from the third external flow channel 9, the coolant needs to flow through the entire first confluence space 41 before flowing out of the first confluence space 41 from the first outlet 42. This increases the residence time of the coolant in the first confluence space 41, thereby improving the cooling effect of the coolant on the first winding 31.

[0333] Referring to Figure 76, in another possible embodiment of this application, the third external flow channel 9 is connected to the fifth position of the second confluence space 51; the second liquid outlet 52 is located at the sixth position of the second confluence space 51; the fifth position and the sixth position are spaced apart along the circumference of the second confluence space 51, and the arc of the line connecting the fifth position and the sixth position along the circumference of the first confluence space 41 is C, where 8π / 9 ≤ C ≤ 8π / 7. Under this positional size constraint, the relative positions of the third external flow channel 9 and the second liquid outlet 52 in the second confluence space 51 can be diagonally or nearly diagonally arranged. After the coolant flows into the second confluence space 51 through the third external flow channel 9, the coolant needs to flow through the entire second confluence space 51 before it can flow out of the second confluence space 51 through the second liquid outlet 52. This increases the residence time of the coolant in the second confluence space 51 and improves the cooling effect of the coolant on the second winding section 32.

[0334] Referring to Figure 77, the motor 100 also has a first external flow channel 7, which extends axially along the stator core 2. The first external flow channel 7 and the third external flow channel 9 are spaced apart circumferentially along the stator core 2. The inlet 12 is also connected to the first confluence space 41 via the first external flow channel 7. The first external flow channel 7 is used to guide the coolant from the side away from the third external flow channel 9 into the first confluence space 41. This increases the contact area between the coolant and the stator core 2, improving the cooling effect of the coolant on the stator core 2.

[0335] There are various ways in which the motor 100 forms the first external flow channel 7. In one embodiment of this application, the stator core 2 and the cavity wall of the mounting cavity 11 are spaced apart, and the outer peripheral surface of the stator core 2 and the inner wall of the mounting cavity 11 of the housing 1 enclose the first external flow channel 7. With this arrangement, on the one hand, the spaced-apart arrangement between the stator core 2 and the cavity wall of the mounting cavity 11 can reduce the installation difficulty of the stator core 2 and the mounting cavity 11 and improve the assembly efficiency of the stator core 2 and the housing 1. On the other hand, when the coolant flows into the first confluence space 41 from the first external flow channel 7, the coolant can simultaneously contact the housing 1 and the stator core 2, and simultaneously carry away the heat of the housing 1 and the stator core 2, thereby improving the heat dissipation efficiency of the coolant for the motor 100.

[0336] In another possible embodiment of this application, the first external flow channel 7 can also be formed solely by the housing 1. Specifically, in this embodiment, the housing 1 has a sandwich layer that forms the first external flow channel 7, and the first external flow channel 7 and the mounting cavity 11 are spaced apart. This arrangement, on the one hand, forms an independent heat dissipation channel because the first external flow channel 7 is spaced apart from the mounting cavity 11. This means that when the coolant flows through the first external flow channel 7, it can focus on dissipating heat from the housing 1 without being disturbed by other components within the mounting cavity 11, thereby improving the heat dissipation efficiency of the housing 1. On the other hand, since there is no longer a gap between the housing 1 and the stator core 2 to form the first external flow channel 7, the inner wall surface of the housing 1 and the stator core 2 can be completely fitted together in this structure, thereby reducing the structural weakening caused by gaps or voids between the stator core 2 and the housing 1, and thus enhancing the structural strength of the housing 1. Simultaneously, the fitted arrangement of the housing 1 and the stator core 2 also indirectly reduces the thermal resistance between the housing 1 and the stator core 2. The heat generated by the stator core 2 can be transferred to the housing 1 more effectively and dissipated quickly through the coolant in the first external flow channel 7, thereby improving the heat dissipation performance of the motor 100.

[0337] Please refer to Figure 78. In one embodiment of this application, the liquid inlet 12 is also connected to the second confluence space 51 via the first external flow channel 7, so as to further increase the contact area between the coolant and the stator core 2 and improve the cooling effect of the coolant on the stator core 2.

[0338] Referring to Figure 79, the motor 100 also has an inner flow channel 6, which extends through the stator core 2 along its axial direction. One end of the inner flow channel 6 is connected to the first confluence space 41, and the other end is connected to the second confluence space 51. The inner flow channel 6 is used to connect the first confluence space 41 and the second confluence space 51 to each other, thereby balancing the coolant flow rate in the first confluence space 41 and the second confluence space 51, improving the uniformity of heat dissipation of the coolant to the first winding section 31 and the second winding section 32, and improving the heat dissipation effect of the coolant.

[0339] This application provides a vehicle that includes an electric powertrain and a frame, the electric powertrain being mounted on the frame and providing power to the vehicle to drive it.

[0340] The electric powertrain 800 includes an engine, electric motor, transmission, drive shaft, differential, and clutch. The engine generates power by burning fuel, while the electric motor converts electrical energy into mechanical energy; both power sources provide the necessary driving force for the vehicle 900. The clutch engages or disengages between the engine or electric motor and the transmission to ensure a smooth transfer of power from the engine or electric motor to the transmission, while allowing the driver to disconnect the engine or electric motor from the transmission when needed for gear shifting. The transmission allows the power from the engine or electric motor to be appropriately adjusted so that the vehicle 900 maintains optimal power output under varying speeds and loads. The drive shaft transmits torque from the transmission to the wheels, enabling the vehicle 900 to move. The differential allows the two drive wheels of the vehicle 900 to rotate at different speeds during cornering or on different road surfaces, contributing to the vehicle 900's stability and handling.

[0341] In hybrid or pure electric vehicles, the electric motor is the primary power source, making its performance and safety crucial. The motor consists of a stator and a rotor. The stator is supplied with current to generate a magnetic field, which drives the rotor to rotate. The rotor's shaft is mounted to the motor housing via bearings. During operation, the stator generates significant heat, and the rotating shaft also heats the bearings.

[0342] In the existing technology, when the stator is cooled by spraying or immersing the cooling medium, the bearings of the motor rotor cannot be cooled and lubricated at the same time, resulting in low overall cooling efficiency of the motor.

[0343] Referring to Figures 80 and 81, this application provides an electric motor, which includes a housing 1, a stator 10, a motor rotor, a current collector ring 30, and a current guiding structure. The housing 1 is used for connection with the frame of a vehicle 900, and the stator 10 is housed within the housing 1.

[0344] The stator 10 includes a stator core 2 and a winding 3. The stator core 2 is used to form a magnetic flux path and to house the winding 3. After the winding 3 is energized, a magnetic field is formed in the winding 3.

[0345] The motor rotor includes a rotor core 310b, a shaft 320, and a bearing 330. The rotor core 310b is housed within the stator core 2. The shaft 320 is inserted into the rotor core 310b, and the bearing 330 is sleeved on the shaft 320, located on one side of the rotor core 310b along the axial direction. The shaft 320 is mounted on the housing 1 via the bearing 330. The rotor core 310b and the shaft 320 can rotate under the magnetic field of the stator 10. The shaft 320 is connected to the gearbox of the vehicle 900, transmitting torque from the gearbox to the wheels through components such as the drive shaft, thereby causing the vehicle 900 to move.

[0346] The busbar ring 30 is located on one side of the stator core 2 along the axial direction, and the busbar ring 30 and the bearing 330 are located on the same side of the stator core 2. The area between the busbar ring 30 and one side of the stator core 2 forms a busbar space 301. The end of the winding 3 is housed in the busbar space 301, and the bearing 330 is located outside the busbar space 301. Coolant is injected into the busbar space 301 to cool the end of the stator core 2 and the end of the winding 3.

[0347] It should be noted that the coolant in the manifold 301 can be other cooling media, such as water or gas.

[0348] The manifold ring 30 can be connected to one axial side of the housing 1, forming a manifold space 301 between the manifold ring 30 and the stator core 2; or the manifold ring 30 can be disposed inside the housing 1 and directly fitted onto one axial side of the stator core 2, so that the manifold ring 30 and the stator core 2 enclose the manifold space 301. A first liquid outlet hole 420 is provided on the manifold ring 30, which communicates with the manifold space 301, allowing coolant to be discharged from the manifold space 301, thus achieving coolant circulation.

[0349] The flow guiding structure has a flow guiding channel 430, which is used to guide the coolant flowing out of the first outlet hole 420 to the bearing 330, thereby achieving cooling and lubrication of the bearing 330. This allows for the simultaneous cooling of multiple components, including the stator core 2, winding 3, and bearing 330, improving the overall cooling efficiency of the motor.

[0350] It should be noted that when cooling the bearing 330, the flow channel 430 only needs to guide the coolant flowing from the first outlet hole 420 to a point where it can contact the bearing 330. When lubrication of the bearing 330 is required, the coolant flowing from the first outlet hole 420 needs to be guided into the interior of the bearing 330.

[0351] Referring to Figures 80, 81, and 84, the motor provided in this application further includes a bearing housing 500, which is fixed to the housing 1. The bearing 330 can be directly fixed to the housing 1, or the bearing 330 can be connected to the housing 1 through the bearing housing 500.

[0352] Bearing 330 includes an inner ring 331a, an outer ring 332, rolling elements 333, and a cage. The inner ring 331a is fixed to the housing 1 or the bearing seat 500. The outer ring 332 is tightly fitted to the shaft 320 and rotates with the shaft 320. A gap 334 exists between the inner ring 331a and the outer ring 332. The rolling elements 333 are accommodated in the gap 334 to convert sliding friction into rolling friction and reduce friction loss. The rolling elements 333 can be balls or rollers. The cage keeps the rolling elements 333 equidistant within the raceway of the inner ring 331a or the outer ring 332, guiding the rolling elements 333 to roll on the correct raceway.

[0353] When the bearing 330 is directly fixed to the housing 1, a first channel is provided on the housing 1. The guide channel 430, the first channel, and the gap 334 are sequentially connected to guide the coolant to the bearing 330, thereby achieving cooling inside the bearing 330 and lubricating the rolling elements 333, reducing friction and wear between the rolling elements 333 and the inner ring 331a and the outer ring 332. It should be noted that when the guide channel 430, the first channel, and the gap 334 are sequentially connected, other areas can be left between the guide channel 430 and the first channel, and between the first channel and the gap 334. That is, when the coolant flows along the guide channel 430 and the first channel to the gap 334, it is only necessary to ensure that a portion of the coolant flows to the gap 334, while some coolant can flow to other areas during this period.

[0354] With the bearing 330 fixed on the bearing housing 500, a second channel 510 is provided on the bearing housing 500. The guide channel 430 and the second channel 510 are connected in sequence to the gap 334, guiding the coolant to the bearing 330, thus achieving both cooling and lubrication of the bearing 330. It should be noted that when the guide channel 430, the second channel 510, and the gap 334 are connected in sequence, other areas can be left between the guide channel 430 and the second channel 510, and between the second channel 510 and the gap 334. That is, when the coolant flows along the guide channel 430 and the second channel 510 to the gap 334, it is only necessary to ensure that a portion of the coolant flows to the gap 334, while some coolant can flow to other areas during this period.

[0355] Referring to Figures 80, 81, and 82, the flow guiding structure includes an annular protrusion 440, which is located on the outer wall of the manifold 30 at one end opposite to the stator core 2 along the axial direction. The annular protrusion 440 surrounds the bearing 330. A first outlet hole 420 is located on the outer wall of the manifold 30. A flow guiding groove is provided on the radially outer side wall of the annular protrusion 440, and the flow guiding channel 430 is formed by the flow guiding groove. The annular protrusion 440 protruding from the outer wall of the manifold 30 can abut against the inner wall of the housing 1 or the inner wall of the bearing seat 500, thereby achieving a seal between the manifold 30 and the housing 1 or the bearing seat 500 and preventing the coolant flowing out from the first outlet hole 420 from entering the motor rotor. The flow guiding channel 430 is located on the annular protrusion 440, thereby directly guiding the coolant in the flow guiding channel 430 to the first channel on the housing 1 or the second channel 510 on the bearing seat 500.

[0356] The first outlet hole 420 extends axially along the stator core 2, and the guide channel 430 extends axially along the stator core 2. The first outlet hole 420 is located on the outer wall of the confluence ring 30 radially outward of the annular protrusion 440. Specifically, the first outlet hole 420 extends along the bearing 330 of the stator core 2 to restrict the outflow direction of the coolant in the confluence space 301, allowing the coolant flowing out of the first outlet hole 420 to enter the guide channel 430. The guide channel 430 extends axially along the stator core 2, allowing the coolant to continue flowing axially along the stator core 2 in the guide channel 430, thus suppressing the coolant from splashing out of the guide channel 430.

[0357] Optionally, the opening of the guide channel faces radially outward from the annular protrusion 440, and the first liquid outlet 420 is located in the opening direction of the guide channel, so that the coolant flowing out of the first liquid outlet 420 can fall into the guide channel 430 under the action of gravity, thereby guiding the coolant along the guide channel 430 to the bearing 330. Multiple first liquid outlets 420 can be provided, and all of the multiple first liquid outlets 420 are located in the opening direction of the guide channel.

[0358] In the motor provided in this application, the bus ring 30 includes a first annular plate 450, a second annular plate 460, and a third annular plate 470. The first annular plate 450 and the second annular plate 460 are arranged radially apart from each other in the stator core 2, and the first annular plate 450 is located outside the second annular plate 460. The third annular plate 470 is connected between the first annular plate 450 and the second annular plate 460. The third annular plate 470 includes a first sidewall 471 and a second sidewall 472 arranged opposite each other along the axial direction of the stator core 2. A first liquid outlet hole 420 passes through the first sidewall 471 and the second sidewall 472. The first sidewall 471 is located in the bus space 301. An annular protrusion 440 is provided on the second sidewall 472. The first liquid outlet hole 420 is provided on the second sidewall 472 between the first annular plate 450 and the annular protrusion 440. Specifically, the third annular plate 470 is connected to the same end of the first annular plate 450 and the second annular plate 460 in the axial direction of the stator core 2. The side wall of the first annular plate 450 near the second annular plate 460, the side wall of the second annular plate 460 near the first annular plate 450, the first side wall 471 and the stator core 2 form a confluence space 301. The flow channel 430 is set on the annular protrusion 440 on the third annular plate 470 to guide the coolant and suppress the coolant from flowing away along the radial outer side wall of the annular protrusion 440.

[0359] The manifold 30 is provided with an inlet 480 and a second outlet 451, both of which are connected to the manifold space 301. The cross-sectional area of ​​the first outlet 420 is smaller than that of the inlet 480. The cross-sectional area of ​​the first outlet 420 refers to the cross-sectional area perpendicular to its extension direction, and the cross-sectional area of ​​the inlet 480 refers to the cross-sectional area perpendicular to its extension direction. When the coolant flows through the inlet 480 and the first outlet 420, the inlet 480 provides a larger planar area for the coolant to pass through compared to the first outlet 420. This makes the inlet efficiency of the inlet 480 greater than the outlet efficiency of the first outlet 420, ensuring that the coolant reaches a certain level within the manifold 30 after entering through the inlet 480, thus providing immersion cooling for the winding 3. While immersing the cooling winding 3, a portion of the coolant can flow to the bearing 330 through the first liquid outlet 420 to cool and lubricate the bearing 330.

[0360] The cross-sectional area of ​​the first outlet hole 420 is smaller than that of the second outlet hole 451. The cross-sectional area of ​​the first outlet hole 420 refers to its cross-sectional area perpendicular to its extension direction, and the cross-sectional area of ​​the second outlet hole 451 refers to its cross-sectional area perpendicular to its extension direction. When coolant flows through the first outlet hole 420 and the second outlet hole 451, the second outlet hole 451 provides a larger planar area for coolant passage compared to the first outlet hole 420, resulting in a lower oil discharge efficiency for the first outlet hole 420 compared to the second outlet hole 451. For example, the diameter of the first outlet hole 420 is smaller than the diameter of the second outlet hole 451.

[0361] Since bearing 330 only requires a portion of coolant for lubrication, meaning the oil output efficiency of the first outlet hole 420 doesn't need to be too high, and oil needs to continue flowing in to ensure the fluidity of the coolant while maintaining the immersion cooling winding 3, a second outlet hole 451 is provided as the main oil outlet of the manifold 301. Furthermore, the height of the second outlet hole 451 in the direction of gravity is greater than that of the first outlet hole 420, so that during the filling of the manifold ring 30 via inlet 480, the coolant level sequentially reaches the first outlet hole 420 and the second outlet hole 451, thereby allowing a portion of the coolant to flow out from the first outlet hole 420 to bearing 330.

[0362] Optionally, a second liquid outlet 451 is provided on the first annular plate 450, and the second liquid outlet 451 penetrates the first annular plate 450 radially through the stator core 2. In one embodiment, the motor includes two bus rings 30 and two bearings 330. One bus ring 30 is located on one side of the stator core 2 along the axial direction and forms a bus space 301 with the area between it and one side of the stator core 2. The other bus ring 30 is located on the other side of the stator core 2 along the axial direction and forms another bus space 301 with the area between the stator cores 2. The two ends of the winding 3 are respectively accommodated in the two bus spaces 301. One bearing 330 is directly fixed to the housing 1, and the other bearing 330 is connected to the housing 1 through a bearing seat 500.

[0363] Referring to Figures 80 and 83, the third annular plate 470 is provided with a wire hole 473 through which the stator core 2 passes through the third annular plate 470 axially. The lead wire of the winding 3 located in the busbar space 301 passes through the wire hole 473 and can be connected to the external circuit to realize the power supply of the winding 3.

[0364] Referring to Figures 80, 82, and 84, the housing 1 is provided with a liquid inlet 12, and a third channel 120c is provided inside the stator core 2 and / or between the outer wall of the stator core 2 and the inner wall of the housing 1. The third channel 120c connects the liquid inlet 12 and two confluence spaces 301. Specifically, the third channel 120c can be provided only inside the stator core 2, so that the third channel 120c is connected to the confluence spaces 301 on both sides of the stator core 2, which increases the heat dissipation area of ​​the stator core 2 and can directly cool the stator core 2 and the winding 3, thereby improving the motor temperature rise. Alternatively, the third channel 120c can be provided between the outer wall of the stator core 2 and the inner wall of the housing 1. In this case, the third channel 120c can be formed by the outer wall of the lug 211 of the stator core 2 and the inner wall of the housing 1. Alternatively, a third channel 120c may be provided both inside the stator core 2 and between the stator core 2 and the housing 1 to further enhance the cooling effect on the stator core 2.

[0365] In the motor provided in this application, the motor also includes an insulating sleeve 200 and a third sealing ring 700. The stator core 2 is provided with a stator slot 111 extending axially along the stator core 2. The insulating sleeve 200 is inserted into the stator slot 111. The insulating sleeve 200 is provided with a mounting hole 310 extending axially along the stator core 2. The winding 3 is inserted into the mounting hole 310. One end of the winding 3 is accommodated in the busbar space 301. The first annular plate 450 is connected to the inner wall of the housing 1, and the second annular plate 460 is connected to the insulating sleeve 200 to achieve a seal between the stator core 2, the housing 1 and the busbar ring 30, and suppress coolant leakage.

[0366] The insulating sleeve 200 has a third protruding edge 620 at one end in the axial direction of the stator core 2, and the second annular plate 460 has a fourth protruding edge 461 at one end near the stator core 2. The third protruding edge 620 and the fourth protruding edge 461 are both arranged circumferentially along the stator core 2, and the third protruding edge 620 and the fourth protruding edge 461 are spaced apart in the radial direction of the stator core 2. The third sealing ring 700 is connected between the third protruding edge 620 and the fourth protruding edge 461 to improve the sealing performance between the stator core 2, the housing 1 and the bus ring 30.

[0367] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0368] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A busbar (30) having a first cavity (1111) and a second cavity (1112) spaced apart axially, the busbar (30) including a partition (15) separating the first cavity (1111) and the second cavity (1112), the partition (15) having a first communication port (1114) connecting the first cavity (1111) and the second cavity (1112) and used to introduce coolant in the second cavity (1112) into the first cavity (1111); the first cavity (1111) is used to accommodate the winding (3) of a motor (100).

2. The bus ring (30) according to claim 1, wherein, The bus ring (30) includes a first inner ring (121a) and a first outer ring (131). The first outer ring (131) is located radially outside the first inner ring (121a), and one axial end of the first inner ring (121a) and one axial end of the first outer ring (131) are both connected to the partition (15). The first cavity (1111) is surrounded by the first inner ring (121a), the first outer ring (131) and the partition (15). The other axial end of the first inner ring (121a) and the other axial end of the first outer ring (131) form an opening (112) for the winding (3) of the motor (100) to pass through to the opening (112) of the first cavity (1111).

3. The bus ring (30) according to claim 2, wherein, The manifold (30) includes an end plate (14) and a second inner ring (122a). The end plate (14) and the partition (15) are spaced apart along the axial direction of the manifold (30). The second inner ring (122a) is connected between the end plate (14) and the partition (15). The second cavity (1112) is surrounded by the end plate (14), the partition (15) and the second inner ring (122a). An inlet (113) communicating with the second cavity (1112) is formed between the radial outer side of the end plate (14) and the radial outer side of the partition (15).

4. The bus ring (30) according to claim 2, wherein, The manifold (30) includes an end plate (14), a second inner ring (122a), and a second outer ring (132). The end plate (14) and the partition (15) are spaced apart along the axial direction of the manifold (30). The second inner ring (122a) and the second outer ring (132) are both connected between the end plate (14) and the partition (15). The second cavity (1112) is formed by the end plate (14), the second inner ring (122a), the second outer ring (132), and the partition (15). The second outer ring (132) is located radially outside the second inner ring (122a). An inlet (113) communicating with the second cavity (1112) is provided on the second outer ring (132).

5. The bus ring (30) according to claim 4, wherein, The diameter of the first outer ring portion (131) is smaller than the outer diameter of the end plate (14).

6. The bus ring (30) according to claim 4, wherein, The first outer ring portion (131) forms a liquid passage extending axially along the manifold (30) on the side opposite to the first inner ring portion (121a). The liquid passage is connected to the second cavity (1112), and one end of the liquid passage forms an inlet (113) connected to the second cavity (1112).

7. The bus ring (30) according to claim 4, wherein, The first inner ring portion (121a) has an outlet (115) that communicates with the first cavity (1111).

8. The bus ring (30) according to claim 4, wherein, The partition (15) includes a first ring portion (151) and a second ring portion (152). The outer edge of the first ring portion (151) is connected to the second inner ring portion (122a), and the inner edge of the first ring portion (151) is connected to the first inner ring portion (121a). The first ring portion (151) is provided with an outlet (115) communicating with the first cavity (1111). The outer edge of the second ring portion (152) is connected to the second outer ring portion (132), and the inner edge of the second ring portion (152) is connected to the second inner ring portion (122a).

9. The bus ring (30) according to claim 4, wherein, On a cross-section perpendicular to the central axis of the busbar (30), the first outer ring (131) is annular, or the first outer ring (131) includes at least two arc segments connected end to end with different diameters.

10. The bus ring (30) according to claim 4, wherein, On a cross-section perpendicular to the central axis of the busbar (30), the second outer ring (132) is annular, or the second outer ring (132) includes at least two arc segments connected end to end with different diameters.

11. The bus ring (30) according to claim 4, wherein, The busbar (30) further includes a connector (20), which has a hollow channel (21) through which the lead wire (400) on the winding (3) passes; the connector (20) is connected to the end plate (14), the hollow channel (21) is connected to the second cavity (1112), and the partition (15) has a wire hole (210a) corresponding to the hollow channel (21).

12. The bus ring (30) according to claim 4, wherein, The busbar (30) further includes a connector (20) having a hollow channel (21) through which the lead wire (400) on the winding (3) passes; the connector (20) passes through the end plate (14) and is connected to the partition (15), and the hollow channel (21) is in communication with the first cavity (1111).

13. The bus ring (30) according to claim 4, wherein, The busbar (30) further includes a connector (20) having a hollow channel (21) through which the lead wire (400) on the winding (3) passes; the connector (20) is connected to the first outer ring (131), and the hollow channel (21) is in communication with the first cavity (1111).

14. The bus ring (30) according to claim 1, wherein, The bus ring (30) also has a plurality of outlets (115) communicating with the first cavity (1111).

15. The bus ring (30) according to claim 14, wherein, The outlet (115) is configured to discharge the medium in the first cavity (1111) when the pressure of the medium is greater than a first predetermined value.

16. The bus ring (30) according to claim 14 or 15, wherein, The bus ring (30) also has a second port (116) communicating with the first cavity (1111); The second port (116) is configured to discharge the medium in the first cavity (1111) when it reaches a predetermined height; and / or, the second port (116) is configured to discharge the medium in the first cavity (1111) when the pressure of the medium is greater than a second predetermined value.

17. The bus ring (30) according to claim 16, wherein, The cross-sectional area of ​​the second port (116) is greater than or equal to 15 mm. 2 .

18. The bus ring (30) according to claim 14, wherein, A third opening (113a) is formed on the bus ring (30) to communicate with the second cavity (1112), or the bus ring (30) is adapted to form a third opening (113a) to communicate with the second cavity (1112) with the housing (1) of the motor (100).

19. The bus ring (30) according to claim 14, wherein, The number of the first connection ports (1114) is multiple, and the first connection ports (1114) are configured such that when the medium pressure in the second cavity (1112) is greater than a threshold, it can enter the first cavity (1111) through the first connection ports (1114).

20. The bus ring (30) according to claim 14, wherein, The cross-sectional area of ​​the outlet (115) is 0.7 mm. 2 Up to 13mm 2 .

21. The bus ring (30) according to claim 14, wherein, The manifold (30) includes an inner ring (12a), an outer ring (13), and an end plate (14). The inner ring (12a) and the outer ring (13) are connected to the same side of the end plate (14), and the outer ring (13) is located radially outside the inner ring (12a). The outer ring (13) forms a second cavity (1112) on the side away from the inner ring (12a), and a first cavity (1111) is formed between the outer ring (13) and the inner ring (12a). The first communication port (1114) is opened on the outer ring (13).

22. The bus ring (30) according to claim 21, wherein, The multiple first communication ports (1114) are divided into multiple groups. Each group of first communication ports (1114) includes multiple first communication ports (1114). The multiple first communication ports (1114) in each group are arranged circumferentially along the outer ring (13), and the first communication ports (1114) in each group are arranged axially along the bus ring (30).

23. The bus ring (30) according to claim 22, wherein, The two adjacent sets of first connecting ports (1114) are staggered; or multiple sets of first connecting ports (1114) are aligned along the axial direction of the bus ring (30).

24. The bus ring (30) according to claim 21, wherein, The outlet (115) is located on the inner ring (12a) or the end plate (14).

25. The bus ring (30) according to any one of claims 21 to 24, wherein, The busbar (30) further includes a connector (20) which is connected to one of the end plate (14) and the outer ring (13); the connector (20) has a hollow channel (21) which is connected to the first cavity (1111).

26. The bus ring (30) according to claim 14, wherein, The manifold (30) includes an inner ring (12a), an outer ring (13), an end plate (14), and a partition (15). The outer ring (13) is located radially around the inner ring (12a). The end plate (14) and the partition (15) are connected between the inner ring (12a) and the outer ring (13). The end plate (14) and the partition (15) are spaced apart along the axial direction of the manifold (30). A second cavity (1112) is formed between the end plate (14) and the partition (15). A first cavity (1111) is formed on the side of the partition (15) away from the end plate (14). A first communication port (1114) is opened on the partition (15).

27. The bus ring (30) according to claim 26, wherein, The outlet (115) is located in the inner ring (12a).

28. The bus ring (30) according to claim 26, wherein, The partition (15) divides the inner ring portion (12a) into a second inner ring portion (122a) and a first inner ring portion (121a). The second inner ring portion (122a) is connected between the end plate (14) and the partition (15). The first inner ring portion (121a) is located on the side of the partition (15) away from the end plate (14). The partition (15) includes a second ring portion (152) and a first ring portion (151). The outer edge of the second ring portion (152) is connected to the outer ring portion (13), and the inner edge of the second ring portion (152) is connected to the second inner ring portion (122a). The outer edge of the first ring portion (151) is connected to the second inner ring portion (122a), and the inner edge of the first ring portion (151) is connected to the first inner ring portion (121a). The first ring portion (151) is provided with an outlet (115) communicating with the first cavity (1111).

29. The bus ring (30) according to any one of claims 26 to 28, wherein, On a cross-section perpendicular to the central axis of the busbar (30), the outer ring (13) is annular, or the outer ring (13) includes at least two arc segments connected end to end with different diameters.

30. A sealing assembly, comprising: The bus ring (30) includes a first through hole (110a) and an inner sidewall (120b) and an outer sidewall (130) disposed opposite to each other. The first through hole (110a) penetrates the inner sidewall (120b) and the outer sidewall (130). The inner sidewall (120b) forms a bus space (301) for accommodating the winding (3). A wire sleeve (200a) is filled in the first through hole (110a) and used to prevent the coolant in the confluence space (301) from flowing out through the first through hole (110a). The wire sleeve (200a) is provided with a wire through hole (210a). A sealing cap (300a) is provided on the port of the first through hole (110a) away from the busbar space (301) to confine the wire sleeve (200a) within the first through hole (110a). The sealing cap (300a) is provided with a second through hole (310a). The wire passage hole (210a) connects the busbar space (301) and the second through hole (310a) so that the lead wire (400) on the winding (3) can pass through the busbar space (301) through the wire passage hole (210a) and the second through hole (310a).

31. The sealing assembly according to claim 30, wherein, The sleeve (200a) includes a sleeve (200a) body and a fifth protrusion (230a). The through hole (210a) passes through the sleeve (200a) body along the axial direction. The sleeve (200a) body is inserted into the first through hole (110a). The fifth protrusion (230a) protrudes from the radial outer peripheral wall of the sleeve (200a) body. The fifth protrusion (230a) is held between the outer wall (130) of the manifold (30) and the sealing cap (300a).

32. The sealing assembly according to claim 31, wherein, The fifth protrusion (230a) is arranged around the main body of the sleeve (200a).

33. The sealing assembly according to claim 31, wherein, The second through hole (310a) has a sixth protrusion (311) that is radially inward on its hole wall. The fifth protrusion (230a) is sandwiched between the outer side wall (130) of the manifold (30) and the sixth protrusion (311).

34. The sealing assembly according to claim 33, wherein, The sixth protrusion (311) is arranged in a ring.

35. The sealing assembly according to claim 30, wherein, The first through hole (110a) has a seventh protrusion (111a) that is radially inward on its hole wall. The wire hole (210a) passes through the wire sleeve (200a) along the axial direction. The first end of the wire sleeve (200a) along the axial direction abuts against the seventh protrusion (111a). The second through hole (310a) has a sixth protrusion (311) that is radially inward on its hole wall, and the second end of the wire sleeve (200a) abuts against the sixth protrusion (311) along the axial direction.

36. The sealing assembly according to any one of claims 30-35, wherein, The outer sidewall (130) includes a first region (131b) and a second region (132a). The first through hole (110a) is provided on the first region (131b). The second region (132a) is located on the outer edge of the first region (131b). The first region (131b) protrudes from the second region (132a) on the side opposite to the inner sidewall (120b). A mounting surface (140) is formed between the first region (131b) and the second region (132a). The sealing cap (300a) is connected to the mounting surface (140).

37. The sealing assembly according to claim 36, wherein, The mounting surface (140) is provided with a first thread (141a), and the wall of the second through hole (310a) is provided with a second thread (312a). The first thread (141a) is connected to the second thread (312a).

38. The sealing assembly according to claim 30, wherein, The sleeve (200a) is interference-fitted with the first through hole (110a).

39. A stator (10), comprising: The stator (10) core has stator (10) slots; An insulating sleeve (200) is inserted into the slot of the stator (10); The second sealing strip (300) is integrally formed with the insulating sleeve (200). The second sealing strip (300) and the insulating sleeve (200) form a mounting hole (310). The mounting hole (310) extends along the axial direction of the stator (10) core and is located in the stator (10) groove. The second sealing strip (300) blocks the groove opening (131a) of the stator (10) groove. The winding (3) is inserted into the mounting hole (310).

40. The stator (10) according to claim 39, wherein, The stator (10) core includes a stator (10) yoke and a plurality of stator (10) teeth. The plurality of stator (10) teeth are circumferentially spaced and protruded on the inner wall of the stator (10) yoke. Each stator (10) tooth extends axially along the stator (10) core. The stator (10) slot is formed between two adjacent stator (10) teeth. The second sealing strip (300) is connected to the adjacent stator (10) teeth to seal the slot opening (131a) of the stator (10) slot. The insulating sleeve (200) includes a first insulating part (210), a second insulating part (220) and a third insulating part (230) connected in sequence. The first insulating part (210) and the third insulating part (230) are respectively connected to two side walls of two adjacent stator (10) teeth that are close to each other. The second insulating part (220) is connected to the inner wall of the stator (10) yoke located between two adjacent stator (10) teeth. The end of the first insulating part (210) away from the second insulating part (220) and the end of the third insulating part (230) away from the second insulating part (220) are both connected to the second sealing strip (300).

41. The stator (10) according to claim 40, wherein, Each of the stator (10) teeth includes a tooth root portion (121b) and a stop portion (122b). The tooth root portion (121b) is connected to the inner wall of the stator (10) yoke. The stop portion (122b) is connected to the end of the tooth root portion (121b) away from the stator (10) yoke. A slot (131a) of the stator (10) groove is formed between two adjacent stop portions (122b). The second sealing strip (300) is connected to the two side walls of the two adjacent stops (122b) that are close to each other.

42. The stator (10) according to claim 41, wherein, The end face of the second sealing strip (300) away from the yoke of the stator (10) is on the same plane as the end face of the stop (122b) away from the tooth root (121b).

43. The stator (10) according to claim 40, wherein, The stator (10) further includes a bus ring (30), which is disposed on one side of the stator (10) core along the axial direction. The area between the bus ring (30) and the stator (10) core along the axial direction forms a bus space (301). One end of the winding (3) is accommodated in the bus space (301). The mounting hole (310) communicates with the bus space (301). A sealing structure is provided between the bus ring (30) and the stator (10) core, and / or, A sealing structure is provided between the manifold (30) and the second sealing strip (300).

44. The stator (10) according to claim 43, wherein, The second sealing strip (300) and the stator (10) teeth meet at one end face of the stator (10) core along the axial direction to form an abutment surface; The sealing structure includes a second sealing ring (620), which abuts against one end face of the busbar (30) along the axial direction of the stator (10) core and the abutting surface.

45. The stator (10) according to claim 43, wherein, The stator (10) further includes a connecting ring. The stator (10) has multiple slots, which are spaced apart along the circumference of the stator (10) core. The insulating sleeve (200) is provided in multiple ways, and the second sealing strip (300) is provided in multiple ways. Each stator (10) slot has one insulating sleeve (200) and one second sealing strip (300). The connecting ring is connected to the same end of a plurality of second sealing strips (300) along the axial direction of the stator (10) core.

46. ​​The stator (10) according to claim 45, wherein, The bus ring (30) has a first protrusion (511) on one end face along the axial direction of the stator (10) core. The first protrusion (511) and the connecting ring are arranged at a distance from each other along the radial direction of the stator (10) core. The sealing structure includes a second sealing ring (620), which abuts against the first protrusion (511) and the connecting ring.

47. The stator (10) according to claim 43, wherein, The stator (10) further includes a connecting ring. The stator (10) has multiple slots, which are spaced apart along the circumference of the stator (10) core. The insulating sleeve (200) is provided in multiple ways, and the second sealing strip (300) is provided in multiple ways. Each stator (10) slot has one insulating sleeve (200) and one second sealing strip (300). The connecting ring is connected to the same end of a plurality of second sealing strips (300) along the axial direction of the stator (10) core; The sealing structure includes a second sealing ring (620), and a third groove (512) is provided on one end face of the busbar (30) along the axial direction of the stator (10) core. The second sealing ring (620) is disposed in the third groove (512), and the second sealing ring (620) abuts against the connecting ring on one end face of the stator (10) core along the axial direction.

48. The stator (10) according to claim 43, wherein, The stator (10) further includes a connecting ring. The stator (10) has multiple slots, which are spaced apart along the circumference of the stator (10) core. The insulating sleeve (200) is provided in multiple ways, and the second sealing strip (300) is provided in multiple ways. Each stator (10) slot has one insulating sleeve (200) and one second sealing strip (300). The connecting ring is connected to the same end of a plurality of second sealing strips (300) along the axial direction of the stator (10) core; The bus ring (30) has a second protruding edge (513) on one end face along the axial direction of the stator (10) core, and the connecting ring has a fourth groove (721) on the end face along the axial direction of the stator (10) core, and the second protruding edge (513) is located in the fourth groove (721).

49. The stator (10) according to claim 48, wherein, The sealing structure includes a second sealing ring (620), which is disposed in the fourth groove (721) and abuts against the second protrusion (513).

50. The stator (10) according to any one of claims 45-49, wherein, Two busbars (30) are provided, and two connecting rings are provided. The two busbars (30) are respectively located on both sides of the stator (10) core along the axial direction, and the two connecting rings are respectively connected to both ends of the plurality of second sealing strips (300) along the axial direction of the stator (10) core.

51. The stator (10) according to claim 50, wherein, The two connecting rings are integrally formed with the plurality of insulating sleeves (200) and the plurality of second sealing strips (300).

52. An electric motor (100), comprising: Stator (10), wherein stator (10) is formed with stator (10) slots; Winding (3), the winding (3) being disposed in the slot of the stator (10); and A busbar (30) is disposed on one side of the stator (10) along the axial direction. A busbar space (301) is formed between the busbar (30) and the stator (10). The end faces of the busbar (30) and the stator (10) are sealed together to seal the busbar space (301).

53. The motor (100) according to claim 52, wherein, The bus ring (30) has a contact surface (312) which is disposed facing one end face of the stator (10) along the axial direction; The motor (100) further includes a first sealing ring (40), which is disposed between the contact surface (312) and the end face of the stator (10), and the first sealing ring (40) is in contact with the contact surface (312) and the end face of the stator (10).

54. The motor (100) according to claim 53, wherein, The contact surface (312) is recessed in the direction away from the stator (10) to form a second groove (321); The first sealing ring (40) is disposed in the second groove (321), and the first sealing ring (40) is in contact with the groove wall surface of the second groove (321) and the end face of the stator (10).

55. The motor (100) according to claim 52, wherein, The stator (10) includes a stator (10) core and a sealing element (120). The stator (10) slot is provided in the stator (10) core, and the stator (10) slot has an opening (112) on the radially inner side facing the stator (10) core. The sealing element (120) is at least partially provided in the stator (10) slot to seal the opening (112). The busbar (30) is in contact with one axial end face of the stator (10) core, and the busbar (30) is sealed to the seal (120).

56. The motor (100) according to claim 55, wherein, The stator (10) core is provided with a plurality of stator (10) slots, and the sealing member (120) has a plurality of first sealing strips (121), each of the first sealing strips (121) sealing the opening (112) of each stator (10) slot; The bus ring (30) has a plurality of protrusions (33) on the side facing the stator (10) core, and the plurality of protrusions (33) are spaced apart circumferentially along the bus ring (30); The protrusion (33) extends into each of the stator (10) slots along the axial direction of the stator (10) core, and the protrusion (33) is sealed to the first sealing strip (121).

57. The motor (100) according to claim 56, wherein, The protrusion (33) and the first sealing strip (121) are spaced apart along the axial direction of the stator (10) core; The motor (100) further includes a first sealing ring (40), which is disposed between the protrusion (33) and the first sealing strip (121). The first sealing ring (40) contacts the protrusion (33) and the first sealing strip (121) to seal the protrusion (33) and the first sealing strip (121).

58. The motor (100) according to claim 56, wherein, The first sealing strip (121) has a third protrusion (1211) on the side facing the protrusion (33), and the third protrusion (1211) is in contact with the protrusion (33); The protrusion (33) has a fourth protrusion (331) on the side facing the seal (120), and the fourth protrusion (331) is in contact with the seal (120); the fourth protrusion (331) and the third protrusion (1211) are arranged radially apart along the stator (10) core; The motor (100) further includes a first sealing ring (40), which is disposed between the third protrusion (1211) and the fourth protrusion (331). The first sealing ring (40) contacts the third protrusion (1211) and the fourth protrusion (331) to seal the third protrusion (1211) and the fourth protrusion (331).

59. The motor (100) according to claim 56, wherein, The first sealing strip (121) has a third protrusion (1211) on the side facing the protrusion (33), and the third protrusion (1211) is in contact with the protrusion (33); The protrusion (33) facing the first sealing strip (121) has a fourth protrusion (331), which is in contact with the third protrusion (1211). The fourth protrusion (331) and the first sealing strip (121) are spaced apart along the axial direction of the stator (10) core. The motor (100) further includes a first sealing ring (40), which is disposed between the third protrusion (1211), the fourth protrusion (331) and the first sealing strip (121), and the first sealing ring (40) is in contact with the third protrusion (1211), the fourth protrusion (331) and the first sealing strip (121).

60. The motor (100) according to claim 56, wherein, One of the protrusion (33) and the first sealing strip (121) is provided with a latch (35), and the other of the protrusion (33) and the first sealing strip (121) is provided with a recess (36). The latch (35) is used to cooperate with the recess (36) to form a seal between the protrusion (33) and the sealing member (120).

61. The motor (100) according to claim 60, wherein, The cross-sectional shape of the latch (35) along the axis perpendicular to the stator (10) core includes triangle, rectangle, circle, and ellipse.

62. The motor (100) according to claim 55, wherein, The sealing element (120) includes a sealing ring (122) and a plurality of first sealing strips (121). The plurality of first sealing strips (121) are connected to the sealing ring (122), and each first sealing strip (121) is spaced apart circumferentially along the sealing ring (122). The first sealing strips (121) are disposed in the opening (112) of the stator (10) groove, and the sealing ring (122) is in contact with the end face of the stator (10) core. The manifold (30) is sealed to the sealing ring (122).

63. The motor (100) according to claim 62, wherein, The bus ring (30) and the sealing ring (122) are arranged radially apart along the stator (10) core; The motor (100) also includes a first sealing ring (40), which is disposed between the bus ring (30) and the sealing ring (122), and the bus ring (30) and the sealing ring (122) are sealed together by the first sealing ring (40).

64. The motor (100) according to claim 62, wherein, The bus ring (30) has a first annular protrusion (34) on the side facing the stator (10) core, and the first annular protrusion (34) is in contact with the stator (10) core; the first annular protrusion (34) and the sealing ring (122) are arranged at a radial distance along the stator (10) core; The motor (100) further includes a first sealing ring (40), which is disposed between the first annular protrusion (34) and the sealing ring (122). The first sealing ring (40) is in contact with the radial outer side of the stator (10) core, the first annular protrusion (34) and the sealing ring (122).

65. The motor (100) according to claim 62, wherein, The bus ring (30) has a first annular protrusion (34) on the side facing the stator (10) core, and the first annular protrusion (34) is in contact with the radial outer side of the sealing ring (122); the first annular protrusion (34) and the end face of the stator (10) core are spaced apart along the axial direction of the stator (10) core. The motor (100) further includes a first sealing ring (40), which is disposed between the first annular protrusion (34), the sealing ring (122) and the stator (10) core. The first sealing ring (40) is in contact with the first annular protrusion (34), the sealing ring (122) and the stator (10) core.

66. The motor (100) according to claim 52, wherein, The stator (10) includes a stator (10) core, and the busbar (30) is disposed on one side of the stator (10) core along the axial direction. The area between the busbar (30) and one side of the stator (10) core along the axial direction forms a busbar space (301) for accommodating the winding (3). The busbar (30) is provided with a first liquid outlet hole (420) communicating with the busbar space (301). The motor (100) further includes: The rotor of the motor (100) includes a rotating shaft (320) and a bearing (330), the stator (10) core is arranged around the rotating shaft (320), and the bearing (330) is sleeved on the rotating shaft (320); The flow guiding structure has a flow guiding channel (430) for guiding the oil flowing out of the first outlet hole (420) to the bearing (330).

67. The motor (100) according to claim 66, wherein, The motor (100) also includes a housing (1), the stator (10) core is housed in the housing (1), the bearing (330) includes an inner ring (331a) and an outer ring (332), the inner ring (331a) is fixed on the rotating shaft (320), the outer ring (332) is fixed on the inner wall of the housing (1), and there is a gap (334) between the inner ring (331a) and the outer ring (332); The housing (1) is provided with a first channel, and the flow channel (430), the first channel and the gap (334) are connected in sequence.

68. The motor (100) according to claim 66, wherein, The motor (100) also includes a housing (1) and a bearing (330) seat. The stator (10) core is housed in the housing (1). The bearing (330) seat is fixed on the housing (1). The bearing (330) includes an inner ring (331a) and an outer ring (332). The inner ring (331a) is fixed on the rotating shaft (320). The outer ring (332) is fixed on the bearing (330) seat. There is a gap (334) between the inner ring (331a) and the outer ring (332). The bearing (330) seat is provided with a second channel (510), and the flow guide channel (430), the second channel (510) and the gap (334) are connected in sequence.

69. The motor (100) according to claim 66, wherein, The flow guiding structure includes a second annular protrusion (440), which is disposed on the outer wall of the busbar (30) at one end away from the stator (10) core along the axial direction of the stator (10) core. The bus ring (30) and the bearing (330) are located on the same side of the stator (10) core axial direction, and the second annular protrusion (440) is arranged around the bearing (330); The first liquid outlet (420) is provided on the outer wall of the manifold (30), and the radial outer side wall (130) of the second annular protrusion (440) is provided with a guide groove, and the guide channel (430) is surrounded by the guide groove.

70. The motor (100) according to claim 69, wherein, The flow channel (430) extends axially along the stator (10) core, and the first liquid outlet (420) is located on the outer wall of the confluence ring (30) radially outside the second annular protrusion (440).

71. The motor (100) according to claim 70, wherein, The first liquid outlet (420) extends along the axial direction of the stator (10) core, the opening (112) of the guide groove faces the radial outer side of the second annular protrusion (440), and the first liquid outlet (420) is located in the direction of the opening (112) of the guide groove.

72. The motor (100) according to claim 69, wherein, The busbar (30) includes a first annular plate (450), a second annular plate (460) and a third annular plate (470). The first annular plate (450) and the second annular plate (460) are arranged radially apart on the stator (10) core, and the first annular plate (450) is located outside the second annular plate (460). The third annular plate (470) is connected between the first annular plate (450) and the second annular plate (460). The first annular plate (450), the second annular plate (460), the third annular plate (470) and the stator (10) core form the busbar space (301). The third annular plate (470) includes a first sidewall (471) and a second sidewall (472) arranged opposite each other along the axial direction of the stator (10) core. The first liquid outlet (420) passes through the first sidewall (471) and the second sidewall (472). The first sidewall (471) is located in the confluence space (301). The second annular protrusion (440) is provided on the second sidewall (472). The first liquid outlet (420) is provided on the second sidewall (472) between the first annular plate (450) and the second annular protrusion (440).

73. The motor (100) according to claim 66, wherein, The manifold (30) is provided with an inlet (480) and a second outlet (451). Both the inlet (480) and the second outlet (451) are connected to the manifold space (301). The cross-sectional area of ​​the first outlet (420) is smaller than that of the inlet (480). The cross-sectional area of ​​the first liquid outlet (420) is smaller than that of the second liquid outlet (451), and the height of the second liquid outlet (451) in the direction of gravity is greater than that of the first liquid outlet (420) in the direction of gravity.

74. The motor (100) according to claim 52, wherein, The motor (100) includes a housing (1) having a liquid inlet (12) and a mounting cavity (11), the liquid inlet (12) being connected to the mounting cavity (11); the stator (10) includes a stator (10) core, the stator (10) core being disposed within the mounting cavity (11), the stator (10) core having a first end face and a second end face axially opposite to each other, an external flow channel (70) being formed between the stator (10) core and the cavity wall of the mounting cavity (11); the stator (10) core having stator (10) slots, the winding (3) having a first winding (3) portion protruding from the first end face and a second winding (3) portion protruding from the second end face; the bus ring (30) includes: A first bus ring (4) is disposed on one side of the first end face. The area between the first bus ring (4) and the first end face forms a first bus space (41). The first winding (3) is partially housed in the first bus space (41). The second busbar (5) is located on one side of the second end face. The area between the second busbar (5) and the second end face forms a second busbar space (51). The second winding (3) is housed in the second busbar space (51). The liquid inlet (12) is connected to the first busbar space (41) and the second busbar space (51) via the external flow channel (70).

75. The motor (100) according to claim 74, wherein, The outflow channel (70) includes a second outflow channel (8) and a third outflow channel (9), and the inlet (12) is connected to the third outflow channel (9) via the second outflow channel (8); the third outflow channel (9) is connected to the first confluence space (41) and the second confluence space (51); The second external flow channel (8) extends circumferentially along the stator (10) core, and the third external flow channel (9) extends axially along the stator (10) core.

76. The motor (100) according to claim 75, wherein, The outer periphery of the stator (10) core is recessed inward to form a first groove (611), and the first groove (611) and the cavity wall of the mounting cavity (11) surround to form a second external flow channel (8); the first groove (611) is arranged around the circumference of the stator (10) core.

77. The motor (100) according to claim 76, wherein, The stator (10) core has a plurality of protrusions (81) on its outer circumferential surface. The plurality of protrusions (81) are disposed in the second external flow channel (8). The protrusions (81) are used to divert the coolant.

78. The motor (100) according to claim 77, wherein, The plurality of protrusions (81) include a second protrusion ring (614) and a first protrusion ring (613) arranged along the axial direction of the stator (10) core. The second protrusion ring (614) includes a plurality of second protrusions (812) spaced apart along the circumferential direction of the stator (10) core. The first protrusion ring (613) includes a plurality of first protrusions (811) spaced apart along the circumferential direction of the stator (10) core. The second protrusions (812) in the second protrusion ring (614) and the first protrusions (811) in the first protrusion ring (613) are staggered.

79. The motor (100) according to claim 77, wherein, The liquid inlet (12) is connected to the first position of the mounting cavity (11); the third external flow channel (9) is located at the second position of the mounting cavity (11); The circumferential arc of the first position and the second position in the mounting cavity (11) is A, where 8π / 9≤A≤8π / 7.

80. The motor (100) according to claim 74, wherein, The first confluence space (41) is provided with a first liquid outlet, and the second confluence space (51) is provided with a second liquid outlet (52).

81. The motor (100) according to claim 80, wherein, The external flow channel (70) is connected to the third position of the first confluence space (41); The first outlet is located at the fourth position of the first confluence space (41); the third position and the fourth position are spaced apart along the circumference of the first confluence space (41), and the arc of the line connecting the third position and the fourth position along the circumference of the first confluence space (41) is B, 8π / 9≤B≤8π / 7.

82. The motor (100) according to claim 80, wherein, The external flow channel (70) is connected to the fifth position of the second confluence space (51); The second outlet (52) is located at the sixth position of the second confluence space (51); the fifth position and the sixth position are spaced apart along the circumference of the second confluence space (51), and the arc of the line connecting the fifth position and the sixth position along the circumference of the first confluence space (41) is C, 8π / 9≤C≤8π / 7.

83. The motor (100) according to claim 80, wherein, The motor (100) further includes a first external flow channel (7), which extends along the axial direction of the stator (10) core. The first external flow channel (7) and the third external flow channel (9) are spaced apart along the circumferential direction of the stator (10) core. The liquid inlet (12) is also connected to the first confluence space (41) via the first external flow channel (7).

84. The motor (100) according to claim 83, wherein, The inlet (12) is also connected to the second confluence space (51) via the first outflow channel (7).

85. The motor (100) according to claim 74, wherein, The stator (10) core is provided with an inner flow channel (6), which penetrates the stator (10) core along the axial direction of the stator (10) core; One end of the inner flow channel (6) is connected to the first confluence space (41), and the other end of the inner flow channel (6) is connected to the second confluence space (51).

86. An electric motor (100) having a first external flow channel (7) and an internal flow channel (6), the electric motor (100) further comprising a housing (1) having an inlet (12) and a mounting cavity (11) having the inlet (12) connected to the first external flow channel (7); the stator (10) comprising a stator (10) core disposed in the mounting cavity (11), the stator (10) core having a first end face and a second end face axially opposite to each other, the internal flow channel (6) disposed in the stator (10) core and penetrating the first end face and the second end face; the stator (10) core having a stator (10) slot, the winding (3) having a first winding (3) portion protruding from the first end face and a second winding (3) portion protruding from the second end face; the bus ring (30) comprising: A first busbar (4) is disposed in the mounting cavity (11). The first busbar (4) forms a first busbar space (41). The first winding (3) is housed in the first busbar space (41). The first external flow channel (7) extends along the axial direction of the stator (10) core. The liquid inlet (12) is connected to the first busbar space (41) via the first external flow channel (7). The second bus ring (5) is disposed in the mounting cavity (11), and the second bus ring (5) forms a second bus space (51), and the second winding (3) is housed in the second bus space (51).

87. The motor (100) according to claim 86, wherein, The outer periphery of the housing (1) and the stator (10) core are arranged to form the first external flow channel (7).

88. The motor (100) according to claim 86, wherein, The housing (1) forms the first external flow channel (7), and the first external flow channel (7) and the mounting cavity (11) are spaced apart.

89. The motor (100) according to claim 86, wherein, The inlet (12) is connected to the second confluence space (51) via the first outflow channel (7).

90. The motor (100) according to claim 86, wherein, The inlet (12) is connected to the middle of the first outflow channel (7).

91. The motor (100) according to claim 90, wherein, The distance between the inlet (12) and the side of the first manifold (4) facing the inlet (12) is A1, and the distance between the inlet (12) and the side of the second manifold (5) facing the inlet (12) is B1, where A1 = B1.

92. The motor (100) according to claim 86, wherein, The first external flow channel (7) is connected to the seventh position of the first confluence space (41); the internal flow channel (6) is connected to the eighth position of the first confluence space (41); The seventh position and the eighth position are arranged circumferentially along the first confluence space (41), and the arc connecting the seventh position and the eighth position along the circumferential direction of the first confluence space (41) is C1, where 8π / 9≤C1≤8π / 7.

93. The motor (100) according to claim 92, wherein, The second confluence space (51) is provided with a second liquid outlet (52), the second liquid outlet (52) is connected to the ninth position of the second confluence space (51), and the inner flow channel (6) is connected to the tenth position of the second confluence space (51); The ninth position and the tenth position are spaced apart along the circumference of the second confluence space (51), and the arc of the line connecting the ninth position and the tenth position along the circumference of the second confluence space (51) is D, where 8π / 9≤D≤8π / 7.

94. The motor (100) according to claim 86, wherein, The stator (10) core is provided with a plurality of inner flow channels (6), and the plurality of inner flow channels (6) are arranged at intervals along the circumference of the stator (10) core.

95. The motor (100) according to claim 86, wherein, The outer surface of the stator (10) core has a second external flow channel (8) that is recessed radially along the stator (10) core; the second external flow channel (8) is connected to the liquid inlet (12).

96. The motor (100) according to claim 95, wherein, The second external flow channel (8) extends circumferentially along the stator (10) core.

97. The motor (100) according to claim 96, wherein, The outer surface of the stator (10) core has a third external flow channel (9) that is recessed radially along the stator (10) core, and the second external flow channel (8) is connected to the first confluence space (41) through the third external flow channel (9); and / or The second external flow channel (8) is connected to the second confluence space (51) through the third external flow channel (9).

98. An electric assembly (800) comprising at least one of a bus ring (30), a sealing assembly, a stator (10), and a motor (100), wherein, The bus ring (30) is a bus ring (30) according to any one of claims 1 to 29; the sealing assembly is a sealing assembly according to any one of claims 30 to 38; the stator (10) is a stator (10) according to any one of claims 39 to 51; the motor (100) is a motor (100) according to any one of claims 52 to 97.

99. A vehicle (900) comprising an electric motor (100) according to any one of claims 52 to 97 or an electric powertrain (800) according to claim 98.

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