Cooling assembly of motor, motor and vehicle

Abstract

The invention discloses a cooling assembly of a motor, the motor and a vehicle, the cooling assembly comprises a flow inlet part and a flow outlet part which are arranged in a sealing cavity, the flow inlet part and the flow outlet part define a cooling space, the flow inlet part and the flow outlet part define the cooling space, and cooling fluid flowing ports are formed in the flow inlet part and the flow outlet part so as to inject cooling fluid into the cooling space and lead the cooling fluid out of the cooling space. The flow inlet piece comprises an inner ring, an outer ring and a plurality of connecting arms, the inner ring, the outer ring and the connecting arms define a containing space matched with the winding unit, and the winding unit is embedded into the containing space and at least partially extends into the cooling space to be in direct contact with cooling fluid. The inflow piece is in a continuous complete ring shape and can be directly sleeved and embedded into the gaps of the winding units, accurate positioning is achieved, assembling interference is avoided, the size of the motor is not additionally increased, the annular inflow piece can achieve winding global dead-corner-free cooling, the annular gap circulation section of multiple channels is regular, complex dead corners do not exist, and cooling fluid circulation resistance is small; the working stability is high.

Description

Technical Field

[0001] This application belongs to the field of motor technology, specifically relating to a cooling assembly for an electric motor, an electric motor, and a vehicle. Background Technology

[0002] Axial flux motors have magnetic circuits distributed along the axial direction, offering advantages such as compact structure, high power density, and large torque. They are also easier to flatten, making them particularly suitable for new energy vehicle applications where installation space is limited. However, axial flux motors have a relatively small effective heat dissipation area, causing heat to accumulate in localized areas and making it difficult to dissipate effectively through natural convection or radiation. This results in poor heat dissipation performance, which limits the application of axial flux motors. Summary of the Invention

[0003] The purpose of this application is to provide a cooling assembly for an electric motor, an electric motor, and a vehicle to optimize the heat dissipation performance of an axial flux motor.

[0004] To achieve the above objectives, the first aspect of this application provides a cooling assembly for an electric motor. The electric motor includes at least a stator assembly, a rotor assembly, and a motor housing. A sealed cavity is formed within the motor housing. The stator assembly includes a winding unit disposed within the sealed cavity. The cooling assembly includes an inlet and an outlet disposed within the sealed cavity. The inlet and the outlet surround a cooling space, and both the inlet and the outlet are provided with cooling fluid inlets to inject and draw cooling fluid into and out of the cooling space. The inlet element includes an inner ring, an outer ring, and a plurality of connecting arms located between the inner ring and the outer ring. The inner ring, the outer ring, and the connecting arms enclose a receiving space that matches the winding unit. The winding unit is embedded in the receiving space and at least partially extends into the cooling space to directly contact the cooling fluid.

[0005] In one or more embodiments, the winding unit includes a plurality of iron cores arranged circumferentially spaced apart, with gaps formed between adjacent iron cores, and the connecting arm connecting the inner ring and the outer ring via the gaps.

[0006] In one or more embodiments, the inner ring interior, the outer ring interior, and the connecting arm interior are connected as a single unit.

[0007] In one or more embodiments, the cooling fluid flow port includes an inlet provided on the inlet member and an outlet provided on the outlet member, the inlet being arranged on the axial end face of the inlet member and the outlet being arranged on the radial end face of the outlet member.

[0008] In one or more embodiments, the inlet includes an outer inlet disposed on the outer ring and an inner inlet disposed on the inner ring, and the outlet is disposed on both axial sides of the outer ring and avoids the outer inlet.

[0009] In one or more embodiments, the winding unit includes a plurality of iron cores arranged circumferentially at intervals, with gaps formed between adjacent iron cores, and the inner inlet corresponding to each gap.

[0010] In one or more embodiments, the external inlet corresponds one-to-one with the iron core.

[0011] In one or more embodiments, the outlet is disposed on the inner circumferential surface of the outlet.

[0012] In one or more embodiments, at least one of the inlet ports and the outlet ports are spatially misaligned.

[0013] In one or more embodiments, the outflow member is provided with a plurality of outflow ports, which are spaced apart on the inner circumferential surface of the outflow member.

[0014] In one or more embodiments, the difference between the number of outflow elements and the number of inflow elements is 1.

[0015] In one or more embodiments, an outlet is arranged on both sides of the axial direction of each inlet.

[0016] In one or more embodiments, the sealed cavity wall is provided with a limiting structure, and the inlet and / or the outlet are engaged on the limiting structure.

[0017] In one or more embodiments, the motor housing includes an annular stator housing for fixing the winding unit and the cooling assembly. The cooling assembly further includes an inlet pipe and an outlet pipe, which extend from the stator housing into the sealing cavity. The inlet pipe is connected to the inlet element or extends from the inlet end of the inlet element to facilitate the introduction of cooling fluid into the inlet element. The outlet pipe is connected to the outlet element or extends from the outlet end of the outlet element to facilitate the extraction of cooling fluid from the outlet element.

[0018] To achieve the above objectives, a second aspect of this application provides an electric motor, including a stator assembly, a rotor assembly, and a cooling assembly as described in any of the above embodiments.

[0019] In one or more embodiments, at least one of the inlet and the outlet are not on the same radial divergence line.

[0020] In one or more embodiments, a pair of rotor assemblies are arranged on both axial sides of the stator assembly.

[0021] To achieve the above objectives, a second aspect of this application provides a vehicle including the motor described in any of the above embodiments.

[0022] The advantages of this application, which differ from existing technologies, are: The cooling assembly of this application includes an inlet and an outlet element arranged in the sealed cavity of the stator assembly. The inlet and outlet elements surround a cooling space. The inlet element includes an outer ring, an inner ring, and a connecting arm, and surrounds an accommodating space that matches the winding unit. The winding unit is embedded in the accommodating space and partially extends into the cooling space. In this cooling space, the cooling fluid can quickly fill the entire space through the directional flow of the inlet element, forming a diffused cooling fluid flow field that permeates the entire winding unit and has a uniformly varied diffusion area. After heat exchange is completed, the fluid is led out by the outlet element to ensure heat dissipation effect. The cooling component of this application has a continuous and complete annular inlet that can be directly fitted and embedded in the gap of the winding unit. This not only achieves precise positioning and avoids assembly interference, but also makes full use of the idle space between the windings. The overall structure is compact and does not increase the axial and radial volume of the motor. The annular inlet provides comprehensive coverage, and the cooling fluid overflows from the inlet and covers the winding unit in a diffused manner, achieving full-area cooling of the winding without dead corners. This effectively avoids the formation of local high temperatures in areas such as the winding ends and teeth, resulting in a more uniform temperature field distribution. At the same time, the flow is smooth and not easy to block. The multi-channel annular gap has a regular flow cross section without complex dead corners, resulting in low resistance to cooling fluid flow and higher long-term stability of the system. The inlet of the cooling component of this application extends axially and the outlet extends radially. The cooling fluid flowing out through the inlet can flow axially to cover all parts of the winding unit along the axis, ensuring the heat exchange area. Then the cooling fluid can pass radially through the gap between adjacent iron cores, ensuring that the cooling fluid covers the sides of the iron core, which helps to further optimize the heat dissipation effect. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an axial cross-sectional view of one embodiment of the motor in this application; Figure 2 yes Figure 1 A magnified view of part A in the diagram; Figure 3 This is an exploded structural diagram of one embodiment of the stator housing of this application; Figure 4 This is a schematic diagram of one embodiment of the cooling assembly and winding unit of this application; Figure 5 This is a schematic diagram of another perspective of one embodiment of the cooling assembly and winding unit of this application; Figure 6 This is a cross-sectional structural schematic diagram of one embodiment of the inlet component of this application; Figure 7 This is a cross-sectional structural schematic diagram of one embodiment of the outgoing component of this application; Figure 8 This is a cross-sectional structural schematic diagram of another embodiment of the inlet component of this application; Figure 9 This is a cross-sectional structural schematic diagram of another embodiment of the outflow component of this application; Figure 10 This is a schematic diagram of one embodiment of the cooling component of this application; Figure 11 This is a schematic diagram of another embodiment of the cooling component of this application; Figure 12 This is a schematic diagram of another embodiment of the cooling component of this application; Figure 13 This is a cross-sectional structural schematic diagram of one embodiment of the stator assembly of this application.

[0025] Explanation of key figure labels: Stator assembly 10; stator housing 101; shaft hole 102; sealing cavity 103; limiting groove 104; cylinder 105; stator bracket 106; limiting hole 1061; cover plate 107; Winding unit 20; Iron core 201; Gap 202; First part 203; Second part 204; Cooling assembly 30; inlet 301; inlet 3011; inner inlet 3011a; outer inlet 3011b; inner ring 3012; outer ring 3013; connecting arm 3014; accommodating space 3015; inlet channel 3016; outlet 302; outlet 3021; ​​outlet channel 3022; cooling space 303; inlet pipe 304; outlet pipe 305; 40mm pivot; Rotor assembly 50; Motor housing 60. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0027] Traditional radial flux motors are technically mature and widely used, but due to the radial magnetic circuit structure, the axial length of the motor is relatively long, which poses a bottleneck to improving power density and is not conducive to application in scenarios such as new energy vehicles where motor size and power density requirements are high.

[0028] Axial flux motors have magnetic circuits distributed along the axial direction, which has the advantages of compact structure, high power density, and large torque. They are also easier to flatten. However, they have poor heat dissipation performance, which limits the application of axial flux motors.

[0029] To address the aforementioned heat dissipation issues, the applicant has developed a cooling assembly for an electric motor. This assembly can be applied inside the stator of an axial flux motor and significantly improves the motor's heat dissipation performance, thereby expanding the applications of axial flux motors.

[0030] Specifically, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the axial z-section structure of one embodiment of the motor of this application. Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0031] like Figure 1 and Figure 2 As shown, the motor typically includes a stator assembly 10, a rotor assembly 50, and a motor housing 60.

[0032] The stator assembly 10 is installed in the motor, and in order to completely recover the cooling fluid, the stator assembly 10 is installed in the sealed cavity 103. There are many ways to form the sealed cavity 103. In this embodiment, a stator housing 101 is provided inside the motor housing 60, and a sealed cavity 103 is formed inside the stator housing 101.

[0033] The stator assembly 10 generally includes a winding, namely the winding unit 20 in this application. The winding unit 20 refers to a specific iron core for providing power, including wires wound around it to transmit electrical energy. The most common material for the wire is copper, followed by silver. In this application, the winding unit 20 is always located inside the sealed cavity 103.

[0034] For details, please refer to Figure 3 , Figure 3 This is an exploded structural diagram of one embodiment of the stator housing of this application. Figure 3 As shown, the stator housing 101 includes a cylindrical body 105 with openings at both ends, a stator support 106 arranged inside the cylindrical body 105, and a cover plate 107 located on the end face of the stator support 106.

[0035] The stator support 106 has a shaft hole 102 inside, and a limiting hole 1061 corresponding to the iron core 201 is formed at the end of the stator support 106 to realize the limiting and installation of the iron core 201; the cover plate 107 is covered on the end face of the stator support 106 to seal the limiting hole 1061 and form a sealing cavity 103 located inside.

[0036] In other embodiments, the stator housing 101 can also adopt any other design commonly used in the art, all of which can achieve the effects of this embodiment.

[0037] In other embodiments, other methods can be used to form a sealed cavity 103 inside the motor housing 60. For example, sealing can be done only at the gaps where the motor housings are joined. Alternatively, sealant can be applied after installation or a combination of sealing methods can be used. These methods are common and readily available in the field and can be completed without creative effort. They are not the core inventive points of this application and therefore will not be described in detail.

[0038] In summary, the fact that the stator assembly 10 is located in the sealing cavity 103 is a premise of this application, and the formation of the sealing cavity 103 has been described in the above textual description, and the method is practical, reliable, and fully valid.

[0039] In this embodiment, the stator housing 101 is considered to be an annular structure in which the stator assembly 10 can be placed; however, it should not be considered that the stator housing 101 can only refer to a part of this embodiment. It should be understood as an abstract collection of structures in the motor housing, or specifically referring to one or two of them, all of which can achieve the effect of this embodiment.

[0040] Please continue reading. Figure 1 and Figure 2 In this embodiment, the cooling assembly 30 is also placed within the sealed cavity 103. The cooling assembly 30 is a general term for the cooling circulation components. In this embodiment, it is important to emphasize the inlet element 301 and the outlet element 302 in the cooling assembly 30. The structure of the inlet element 301 and the outlet element 302 is ring-like, but not strictly ring-like. They clearly have two shape characteristics: an outer contour that is curved and a tendency to close at both ends. In this embodiment, both the inlet element 301 and the outlet element 302 have these two characteristics, and the inlet element 301 and the outlet element 302 are arranged on one or both sides along the axial extension direction of the motor.

[0041] In this embodiment, a structure exists between the outer ring 3013 and the inner ring 3012 of the inlet element 301, fixing the inner ring 3012 and the outer ring 3013 together. This gives the inlet element 301 a disc-like shape. The outlet element 302 can be a single ring or have both inner and outer rings. However, the connection between the inner and outer rings can be achieved by connecting arms in a few locations, such as one or two; or by having more connecting arms, such as three or more. Regardless of the method, in actual use, the cooling fluid inlets of the inlet element 301 are generally located on both axial sides, while the cooling fluid inlets of the outlet element 302 are generally located on the radially inner side. Thus, apart from the cooling channels within the inlet element 301 and the outlet element 302, the flow channel connecting the inlet element 301 and the outlet element 302 is a disc-like space within the sealed cavity 103, enclosed by the inlet element 301 and the outlet element 302. This should be considered a morphological feature. It is not required that the inlet element 301 and the outlet element 302 themselves form a sealed disc-shaped space during actual use; of course, as the technology matures in the future, the inlet element 301 and the outlet element 302 may serve as flow channels while also sealing and forming multiple disc-shaped spaces. The disc-shaped space structure that may appear in the future, as enjoyed in this embodiment, is still within the protection scope of the disc-shaped space in this application. For clarity of description, the disc-like space in this application is named cooling space 303.

[0042] The inlet 301 is configured to receive externally input cooling fluid and input it into the cooling space 303, while the outlet 302 is configured to draw out the cooling fluid that permeates the cooling space 303.

[0043] By injecting cooling fluid into the cooling space 303, the inlet component 301 can form an inlet flow field that can permeate the entire winding unit 20. The cooling fluid can draw out the cooling fluid that has completed heat exchange with the winding unit 20 in the cooling space 303, thereby achieving effective heat dissipation of the high-heat winding unit 20 inside the stator assembly 10 of the motor.

[0044] The disc-shaped cooling space 303 refers to a cooling space whose thickness is much smaller than its radius. In this cooling space 303, the cooling fluid can quickly fill the entire flat cavity through the directional flow of the inlet 301, forming a diffuse inlet flow field that spreads evenly around the winding unit 20 and surrounds the winding. There are no flow blind spots or heat exchange dead zones, ensuring that the cooling fluid and the heat-generating winding unit 20 achieve full contact throughout the entire area, and after completing efficient heat exchange, it is led out by the outlet 302.

[0045] The cooling fluid can be a cooling liquid, such as cooling oil or cooling water, or it can be a cooling gas, both of which can achieve the effect of this embodiment.

[0046] Specifically, in this embodiment, the motor includes a pair of rotor assemblies 50 symmetrically arranged on both sides of the axial z-axis of the stator assembly 10. The rotor assemblies 50 are mounted on a rotating shaft 40 that passes through the stator assembly 10. The motor is specifically a dual-rotor single-stator motor with axial magnetic flux.

[0047] In other embodiments, the motor may also be a single rotor single stator motor with axial flux, or a double stator single rotor motor with axial flux, or a multi-disc motor with rotor and stator interleaved with axial flux, or a radial flux motor, etc. By incorporating the cooling component 30 of this embodiment into the stator assembly 10, the purpose of effectively improving heat dissipation performance can be achieved.

[0048] For further details, please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of one embodiment of the cooling assembly and winding unit of this application. Figure 5 This is a schematic diagram of another perspective of one embodiment of the cooling assembly and winding unit of this application.

[0049] like Figure 4 and Figure 5 As shown, the cooling space 303 in this embodiment can be understood as a standard circular iron disc. The cooling fluid enters the cooling space 303 from one or more points on the axial end face or the circumferential end face of the cooling space 303, and exits from one or more points on the circumferential end face or the axial end face of the cooling space 303. The extension direction of the inlet 3011 on the inlet member 301 is not parallel to the extension direction of the outlet 3021 on the outlet member 302, so that at least two cooling fluid flow fields with different flow directions can be formed in the cooling space 303.

[0050] Based on the above scheme, in order to avoid the cooling fluid flowing through the cooling space 303 along the shortest path, and at the same time increase the path length of the cooling fluid to optimize the heat dissipation effect, in this embodiment the cooling fluid enters from the axial end face or the circumferential end face of the cooling space 303 and exits from the circumferential end face or the axial end face, so that the cooling space 303 can cover the entire area of ​​the pancake-shaped cooling space 303.

[0051] Understandably, in order to achieve the injection and extraction of cooling fluid, the inlet 301 and outlet 302 in this embodiment are designed with hollow interiors, so that the cooling fluid can flow and diffuse inside the inlet 301 and outlet 302, thereby achieving full coverage of the injection and extraction of cooling fluid in the cooling space 303.

[0052] Specifically, please refer to Figure 6 and Figure 7 , Figure 6 This is a cross-sectional structural schematic diagram of one embodiment of the inlet component of this application. Figure 7This is a cross-sectional structural schematic diagram of one embodiment of the outflow component of this application, as shown below. Figure 6 and Figure 7 As shown, in this embodiment, the inlet component 301 and the outlet component 302 respectively form an integrally connected inlet channel 3016 and an outlet channel 3022. Accordingly, the inlet component 301 inputs cooling fluid into its internal inlet channel 3016 through a single inlet pipe 304, and the outlet component 302 leads out the cooling fluid from its internal outlet channel 3022 through a single outlet pipe 305.

[0053] In other embodiments, multiple non-connected flow paths can also be formed inside the inlet member 301 and the outlet member 302, and the input and output of cooling fluid can be achieved through multiple inlet pipes 304 and outlet pipes 305. For example, please refer to [link to relevant documentation]. Figure 8 and Figure 9 , Figure 8 This is a cross-sectional structural schematic diagram of another embodiment of the inlet component of this application. Figure 9 This is a cross-sectional structural schematic diagram of another embodiment of the outflow component of this application.

[0054] like Figure 8 As shown, in this embodiment, the inlet member 301 has two independent inlet channels 3016 formed inside, and cooling fluid is introduced into the two inlet channels 3016 through two inlet pipes 304 respectively; as Figure 9 As shown, in this embodiment, the outlet member 302 has two independent outlet channels 3022 inside, and the cooling fluid is drawn out from the two outlet channels 3022 through two outlet pipes 305 respectively.

[0055] For further details, please refer to Figure 10 , Figure 10 This is a schematic diagram of one embodiment of the cooling component of this application, as shown below. Figure 10 As shown, in this embodiment, the inlet 3011 and the outlet 3021 are not located on the same axial divergence line x1, nor on the same radial divergence line x2. This allows at least two cross-composite flow fields with different flow directions to be constructed within the cooling space 303, forcing the cooling fluid to diffuse throughout the pancake-shaped cooling space 303, thereby covering all surfaces of the winding unit 20 embedded in the cooling space 303 and significantly improving the heat dissipation effect.

[0056] In this embodiment, the axial end face of the inlet member 301 and the inner peripheral surface of the outlet member 302 enclose the cooling space 303.

[0057] In other embodiments, the other surfaces of the inlet member 301 and the other surfaces of the outlet member 302 may be arranged to form a cooling space 303, so that the cooling fluid can enter the cooling space 303 through one or more points on the axial end face or the circumferential end face of the cooling space 303, and be led out from one or more points on the circumferential end face or the axial end face of the cooling space 303. All of these can achieve the effect of this embodiment.

[0058] For example, please refer to Figure 11 , Figure 11 This is a schematic diagram of another embodiment of the cooling component of this application, as shown below. Figure 11 As shown, in this embodiment, the axial end face of the inlet member 301 and the outer peripheral surface of the outlet member 302 form the cooling space 303. By opening the axial end face of the inlet member 301 and the outer peripheral surface of the outlet member 302, the purpose of injecting and drawing out cooling fluid into the cooling space 303 can also be achieved.

[0059] Please see Figure 12 , Figure 12 This is a schematic diagram of another embodiment of the cooling component of this application, as shown below. Figure 11 As shown, in this embodiment, the circumferential surface of the inlet member 301 and the axial end face of the outlet member 302 surround the cooling space 303, which can also achieve the purpose of injecting and drawing out cooling fluid into the cooling space 303.

[0060] In addition, in this embodiment, the axial end face of the inlet 301 is a plane, and the inner circumferential surface of the outlet 302 is a cylindrical surface. In other embodiments, the axial end face of the inlet 301 may not be a plane, for example, it may be a concave surface, a planar surface, an irregular surface, etc., and the inner circumferential surface of the outlet 302 may be a conical surface inclined relative to the axial direction z, or an uneven surface, etc., which can be adjusted according to actual needs, and all can achieve the effect of this embodiment.

[0061] The structure of the cooling assembly 30 is described in detail below. Please refer to 10. In this embodiment, the cooling assembly 30 includes an inlet 301 and two outlets 302 arranged on both sides of the inlet 301 along the axial z-axis, so that the two sides of the inlet 301 along the axial z-axis can respectively form a pancake-shaped cooling space 303 with the corresponding side of the inlet 301. Correspondingly, the winding unit 20 is embedded in the inlet 301, and the two sides of the winding unit 20 along the axial z-axis can respectively be embedded in the corresponding side of the cooling space 303, thereby increasing the heat exchange area.

[0062] It should be noted that in other embodiments, the cooling assembly 30 may also include other numbers of inlet members 301 and other numbers of outlet members 302. The inlet members 301 and outlet members 302 may be alternately stacked along the axial direction z, and the difference between the number of outlet members 302 and the number of inlet members 301 shall be 1, thereby ensuring that each inlet member 301 is adjacent to an outlet member 302 on both sides of the axial direction z, thus achieving the effect of this embodiment.

[0063] In other embodiments, the number of inlet members 301 and outlet members 302 can be the same, or the number of inlet members 301 can be greater than the number of outlet members 302. For example, the cooling assembly 30 may include one inlet member 301 and one outlet member 302 arranged sequentially along the z-axis. The inlet member 301 can be arranged at one end of the winding unit 20 along the z-axis, and the outlet member 302 can be arranged at the other end, ensuring that the cooling fluid flowing out through the inlet 3011 can cover all parts of the winding unit 20, which can also ensure a certain degree of cooling. This embodiment can achieve the desired effect to a certain extent, but may reduce the heat dissipation efficiency. Alternatively, the cooling assembly 30 may include two inlet members 301 and one outlet member 302. The two inlet members 301 may be disposed on both sides of the axial z-axis of the outlet member 302. The winding unit 20 may be embedded inside the outlet member 302 and extend into the cooling spaces 303 on both sides of the outlet member 302. This ensures that the cooling fluid flowing out through the inlet 3011 can cover all parts of the winding unit 20, which can also achieve the desired effect to a certain extent.

[0064] The disc-shaped cooling space envisioned in this embodiment does not refer to a traditional four-sided sealed space. The cooling space 303 is enclosed by the body, outline, and extension lines of the outline of the inlet member 301 and the outlet member 302, as well as their extended surfaces. In practical applications, all or most of the cooling fluid injected by the inlet member 301 can be retained within this cooling space and ultimately led out by the outlet member 302. For example, refer to... Figure 10 As shown, in this embodiment, the upper surface of the uppermost outflow member 302 and the extended surface of the surface constitute the top wall of the cooling space 303, the inner peripheral surface of the outflow member 302 constitutes the outer peripheral wall of the cooling space 303, the top surface of the inflow member 301 constitutes the bottom wall of the cooling space 303, and the extended surface of the inner peripheral surface of the inflow member 301 constitutes the inner peripheral surface of the cooling space 303.

[0065] It should be noted that, Figure 10The notch area of ​​the outlet component 302 is used to avoid the line connected to the winding unit 20, but the inner circumferential surface of the outlet component 302 located on both sides of the notch area extends inward and also intersects to form the outer circumferential wall of the cooling space 303. In addition, in this embodiment, the inlet component 301 is provided with a accommodating space 3015 for accommodating the winding unit 20. During assembly, most of the accommodating space 3015 is occupied by the winding unit 20. Therefore, it can be abstractly understood that the bottom surface of the cooling space 303 is basically sealed, and the bottom wall of the cooling space 303 can be understood as a disc-shaped disc surface. Figure 10 The cooling space 303 formed by the outlet 302 and inlet 301 located at the bottom is the same as described above, and will not be repeated here.

[0066] Furthermore, such as Figure 2 and Figure 4 As shown, in this embodiment, the extension length d1 of the inlet member 301 in the axial z direction is less than the extension length d2 of the outlet member 302 in the axial z direction.

[0067] Based on the above scheme, since the winding unit 20 is embedded in the inlet member 301, setting the axial z-length of the inlet member 301 to be less than that of the outlet member 302 can effectively reduce the volume of the inlet member 301 blocking the winding unit 20, thereby increasing the effective volume of the winding unit 20 extending into the cooling space 303, increasing the heat exchange area, and thus improving the heat dissipation effect.

[0068] Furthermore, when the overall volume of the cooling space 303 increases, the volume of the space on both sides of the radial x-shaped gap 202 between adjacent iron cores 201 increases significantly. When the axial z-length of the inlet element 301 decreases according to the set value, the volume increase rate of the space on both sides of the radial x-shaped gap 202 is higher than that of the gap 202 itself because the flow area on both sides of the gap 202 is larger. When the cooling fluid flows into the narrow gap 202 from the larger radial x-shaped inner space, according to the principle of constant flow, its flow velocity in the gap 202 will be significantly increased, further enhancing the heat dissipation effect.

[0069] Specifically, considering assembly precision and heat dissipation, there is also a gap between the winding unit 20 and the accommodating space 3015. Cooling fluid can flow through the gap on both sides of the inlet member 301. When the thickness of the outlet member 302 is greater than that of the inlet member 301, the volume of the gap 202 is larger, and the volume of the gap between the inlet member 301 and the winding unit 20 is smaller. This increases the flow rate of the cooling fluid in the gap 202 and reduces the volume of the cooling fluid in the gap. The larger flow rate can more thoroughly cool the cooling fluid that has completed heat exchange in the gap per unit time, thereby achieving a better cooling effect at the gap. The greater the thickness of the gap 202 relative to the thickness of the slit, the greater the kinetic energy of the cooling fluid flowing in the gap. Considering the viscosity between the cooling fluids, the difference in density between the cooling fluids at the gap 202 and the slit after heat exchange, and the thermal motion of molecules, when the thickness of the outflow element 302 is greater than that of the inflow element 301, the cooling fluid in the gap between the inflow element 301 and the winding unit 20 can participate in the cooling work more efficiently, thereby achieving a better heat dissipation effect.

[0070] Specifically, in one embodiment, the ratio of the extension length d1 of the inlet member 301 in the axial z direction to the extension length d2 of the outlet member 302 in the axial z direction can be 1: (1.1~5) to maximize the heat dissipation effect while ensuring the flow rate of the cooling fluid inside the inlet member 301.

[0071] Please continue reading. Figure 10 In this embodiment, the outlet element 302 is sleeved on the outer periphery of the winding unit 20. At this time, the cooling fluid is drawn out from the outer periphery of the cooling space 303, which helps to ensure that the cooling fluid fully covers the iron core 201 inside the cooling space 303.

[0072] In this embodiment, the inlet 301 includes an outer ring 3013 located on the outer periphery of the winding unit 20 and an inner ring 3012 located on the inner periphery of the winding unit 20. The inlet 3011 includes an outer inlet 3011b arranged on the outer ring 3013 and an inner inlet 3011a arranged on the inner ring 3012. The outlet 302 is arranged on both sides of the axial z of the outer ring 3013 and is located on the outer periphery of the outer inlet 3011b.

[0073] Based on the above scheme, the cooling fluid flowing out through the inner inlet 3011a flows axially along the z-axis, covering the radially x-inner side of the iron core 201. It then flows along the gap 202 to the outer ring 3013 and finally exits through the outlet 3021. The specific path can be found in [reference needed]. Figure 4 The cooling fluid flowing out through the outer inlet 3011b flows axially along the z-axis, covering the radially x-outer side of the iron core 201, and then flows circumferentially to the outlet 3021, or is directly discharged through the outlet 3021. See details in [reference needed]. Figure 4The b path in the design enables heat exchange between the cooling fluid and various parts of the iron core 201, which helps to further optimize the heat dissipation effect.

[0074] In this embodiment, the inlet element 301 also includes a connecting arm 3014 that connects the inner ring 3012 and the outer ring 3013 through the gap 202 between adjacent iron cores 201, so that the inner ring 3012 and the outer ring 3013 can be connected as one unit, which facilitates the installation and manufacturing of the inlet element 301.

[0075] Specifically, the gaps 202 between the connecting arm 3014 and the adjacent iron core 201 are set one-to-one, and the adjacent connecting arm 3014, inner ring 3012 and outer ring 3013 surround to form an accommodating space 3015 that matches the iron core 201.

[0076] Based on the above scheme, the inner ring 3012, the outer ring 3013 and the connecting arm 3014 can cooperate to receive the winding unit 20 and completely fix the winding unit 20. At the same time, the inner ring 3012 and the outer ring 3013 are connected as one unit. By connecting part of the outer ring 3013 to the stator housing 101, it is convenient to install the inlet element 301.

[0077] Furthermore, in this embodiment, the inner inlet 3011a corresponds one-to-one with the gap 202 of the adjacent iron core 201, the outer inlet 3011b corresponds one-to-one with the iron core 201, and the radial x inner circumferential surface of the outlet 302 is provided with a plurality of outlets 3021 arranged circumferentially at intervals.

[0078] Based on the above scheme, it helps to promote the cooling fluid flowing out through the inner inlet 3011a into the gap 202, increase the flow rate of the cooling fluid in the gap 202, and at the same time, the cooling fluid after passing through the gap 202 can be quickly drawn out through the adjacent outlet 3021, thereby improving the heat dissipation efficiency.

[0079] In this embodiment, the outlet 302 is located on the outer periphery of the outer inlet 3011b, so that the outlet 302 avoids the inlet 3011 of the inlet 301, thus preventing the outlet 302 from blocking the cooling fluid from entering and causing poor cooling fluid flow. In other embodiments, the outlet 302 can also be located on the inner periphery of the outer inlet 3011b, avoiding the opening of the inlet 301, and both can achieve the effect of this embodiment.

[0080] In addition, in this embodiment, the outflow element 302 and the inflow element 301 are arranged close together to avoid the outflow element 302 blocking the flow of cooling fluid on the side facing the inflow element 301, thereby improving the flow efficiency. In other embodiments, the outflow element 302 and the inflow element 301 can also be arranged at intervals, and the effect of this embodiment can also be achieved by arranging a flow guiding structure between them.

[0081] In this embodiment, the outlets 3021 on the outlet element 302 are arranged at equal intervals to uniformly draw out the cooling fluid from all parts of the cooling space 303, ensuring that the heat dissipation efficiency is consistent at all parts of the winding unit 20 and avoiding the formation of temperature gradients between different positions of the winding unit 20.

[0082] In this embodiment, most of the inlets 3011 are staggered from the outlets 3021 in the radial x direction to prevent the cooling fluid from flowing out of the inlets 3011 and being discharged directly from the outlets 3021 along the shortest path, thus ensuring the heat dissipation effect.

[0083] Based on the above scheme, the inlet element 301 is a continuous and complete ring shape, which can be directly fitted and embedded in the gap 202 of the winding unit 20. This not only achieves precise positioning and avoids assembly interference, but also makes full use of the idle space between the windings. The overall structure is compact and does not increase the volume of the motor's axial z and radial x. In addition, the ring-shaped inlet element 301 has full coverage. After the cooling fluid overflows from the inlet 3011, it covers the winding unit 20 in a diffused manner, which can achieve full-area cooling of the winding without dead corners. This effectively avoids the formation of local high temperatures in areas such as the winding ends and teeth, and the temperature field distribution is more uniform.

[0084] In particular, the continuous annular inlet 301 can evenly distribute the cooling fluid circumferentially, ensuring that each phase winding and each region winding receives a basically consistent cooling flow rate, resulting in strong consistency in cooling effect and avoiding insufficient local heat dissipation due to uneven flow. At the same time, the flow is smooth and not easy to block. The multi-channel annular gap has a regular flow cross section without complex dead corners, resulting in low resistance to cooling fluid flow and higher long-term stability of the system.

[0085] Furthermore, in this embodiment, the connecting arm 3014 is hollow inside, and the inner ring 3012, the connecting arm 3014, and the outer ring 3013 are connected as one unit.

[0086] Based on the above scheme, the cooling fluid can flow between the inner ring 3012 and the outer ring 3013, which can ensure that the pressure of the cooling fluid flowing out through the inner inlet 3011a and the outer inlet 3011b is the same, which helps to achieve uniform heat dissipation at all parts of the iron core 201; at the same time, a single fluid source can be used to supply cooling fluid to both the inner ring 3012 and the outer ring 3013, which helps to simplify the structure.

[0087] It should be noted that in other embodiments, the connecting arm 3014 may be omitted, or the interior of the connecting arm 3014 may not be hollow. The interior of the inner ring 3012 and the interior of the outer ring 3013 may be independently arranged, and cooling fluid may be supplied to the interior of the inner ring 3012 and the interior of the outer ring 3013 through corresponding flow inlet mechanisms. Alternatively, the connecting arm 3014 may not correspond one-to-one with the gap 202 of the adjacent iron core 201. For example, the connecting arm 3014 may only be arranged next to part of the iron core 201, etc. Adjustments can be made based on actual needs, and all of these can achieve the effect of this embodiment to a certain extent.

[0088] In particular, in this embodiment, the connecting arm 3014 does not have an inlet 3011. In other embodiments, the connecting arm 3014 may have an inlet 3011. The cooling fluid may also enter the gap 202 of the adjacent iron core 201 directly through the inlet 3011 on the connecting arm 3014, which can also help improve the heat dissipation effect.

[0089] In this embodiment, the winding unit 20 includes a first part 203 located on one side of the axial z-axis of the inlet member 301 and a second part 204 located on the other side of the axial z-axis of the inlet member 301. The inlet port 3011 is arranged on both sides of the axial z-axis of the inlet member 301. The extension length of the first part 203 in the axial z-axis is the same as the extension length of the second part 204 in the axial z-axis. That is, the inlet member 301 is located at the middle position of the axial z-axis of the winding unit 20. At the same time, the inlet port 3011 is symmetrically arranged on both sides of the axial z-axis of the inlet member 301.

[0090] Based on the above scheme, the cooling fluid pressure in the cooling space 303 on both sides of the inlet 301 can be equal, thereby making the heat exchange efficiency on both sides of the axial z of the winding unit 20 equal, thus ensuring uniform heat dissipation at all parts of the core 201 and the winding, avoiding temperature gradients, and further improving heat dissipation performance.

[0091] It should be noted that in other embodiments, the inlet 3011 may be arranged only on the axial z side of the inlet member 301. Correspondingly, the inlet member 301 may also be arranged at the axial z end of the winding unit 20, ensuring that the cooling fluid flowing out through the inlet 3011 can cover all parts of the axial z of the winding unit 20. This can also achieve the effect of this embodiment to a certain extent, but may lead to a reduction in heat dissipation efficiency.

[0092] In addition, in other embodiments, the extension lengths of the first part 203 and the second part 204 may be different. Correspondingly, the total opening area of ​​the inlet ports 3011 on both sides of the axial z-axis of the inlet member 301 may also be adjusted accordingly. This can be selected based on actual needs and can also achieve the effect of this embodiment to a certain extent.

[0093] In this embodiment, the inlet element 301 and the outlet element 302 are closely fitted together, which helps to reduce the axial z-length of the stator assembly 10, thereby reducing the space occupied by the motor in the axial z-direction. In other embodiments, based on actual needs, the inlet element 301 and the outlet element 302 can also be arranged at intervals, which can also achieve the effect of this embodiment.

[0094] In this embodiment, the cooling assembly 30 also includes an inlet pipe 304 extending radially x from the outer edge of the stator housing 101 into the sealing cavity 103. The outer end of the inlet pipe 304 is connected to the liquid storage unit, and the inner end is connected to the inner side of the outer ring 3013 of the inlet member 301 to inject cooling fluid into the inlet member 301.

[0095] In other embodiments, the inlet pipe 304 may also be inserted into the sealing cavity 103 from other surfaces of the stator housing 101, such as the axial end face, or the inlet pipe 304 may be connected only to the inner ring 3012, or the inlet pipe 304 may be connected to both the inner ring 3012 and the outer ring 3013 at the same time, etc., all of which can achieve the effect of this embodiment.

[0096] In this embodiment, the cooling assembly 30 also includes an outlet pipe 305 extending radially x from the outside of the stator housing 101 into the sealing cavity 103. The outer end of the outlet pipe 305 is connected to the hydrodynamic unit, and the inner end is connected to the inside of the outlet member 302 to draw the cooling fluid from the inside of the outlet member 302 to the outside of the stator housing 101.

[0097] In other embodiments, the outlet pipe 305 can also be inserted into the sealing cavity 103 from other surfaces of the stator housing 101 in other directions, such as the axial end face of the stator housing 101, etc., and the effect of this embodiment can also be achieved.

[0098] For further details, please refer to Figure 13 , Figure 13 This is a cross-sectional structural schematic diagram of one embodiment of the stator assembly of this application. For example... Figure 13 As shown, in this embodiment, the cavity wall of the sealing cavity 103 is provided with a limiting groove 104, and the inlet component 301 and the outlet component 302 are fixed in the limiting groove 104.

[0099] In other embodiments, when the inlet element 301 and the outlet element 302 are arranged at intervals, the wall of the sealing cavity 103 can also be provided with two limiting grooves 104 that match the inlet element 301 and the outlet element 302, respectively. Alternatively, the wall of the sealing cavity 103 can also be provided with other limiting structures for fixing the inlet element 301 and the outlet element 302, such as snap-fit, etc. Or, the inlet element 301 and the outlet element 302 can also be fixed to the wall of the sealing cavity 103 in other ways, such as adhesive bonding, welding, etc., all of which can achieve the effect of this embodiment. This application also provides an electric motor, such as Figure 1 As shown, the motor includes the cooling assembly 30 of any of the above embodiments, as well as the stator assembly 10, the shaft 40 and the rotor assembly 50.

[0100] In this embodiment, the motor is specifically a dual-rotor single-stator motor with axial magnetic flux. The rotating shaft 40 passes through the shaft hole 102 of the stator assembly 10, and a pair of rotor assemblies 50 are respectively connected to the two ends of the rotating shaft 40, so that a pair of rotor assemblies 503 are stacked on both sides of the axial direction z of the stator assembly 10.

[0101] In other embodiments, the motor may also be a single rotor and single stator motor with axial flux, or a double stator and single rotor motor with axial flux, or a multi-disc motor with rotors and stators stacked alternately with axial flux, or a radial flux motor, etc., all of which can effectively improve heat dissipation performance.

[0102] This application also provides a vehicle that includes the motor of any of the above embodiments.

[0103] Specifically, in one embodiment, the vehicle can be a new energy vehicle that uses a motor to drive a drive shaft to rotate in order to move the wheels, including pure electric vehicles, plug-in hybrid electric vehicles, range-extended hybrid electric vehicles, etc.

[0104] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0105] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cooling assembly for an electric motor, the electric motor comprising at least a stator assembly, a rotor assembly, and a motor housing, wherein a sealed cavity is formed within the motor housing, and the stator assembly includes winding units disposed within the sealed cavity, characterized in that, The cooling assembly includes an inlet and an outlet arranged in the sealed cavity. A cooling space is formed around the inlet and the outlet, and both the inlet and the outlet are provided with cooling fluid flow ports to inject and draw cooling fluid into and out of the cooling space. The inlet element includes an inner ring, an outer ring, and a plurality of connecting arms located between the inner ring and the outer ring. The inner ring, the outer ring, and the connecting arms enclose a receiving space that matches the winding unit. The winding unit is embedded in the receiving space and at least partially extends into the cooling space to directly contact the cooling fluid.

2. The cooling assembly according to claim 1, characterized in that, The winding unit includes a plurality of iron cores arranged circumferentially at intervals, with gaps formed between adjacent iron cores, and the connecting arm connecting the inner ring and the outer ring via the gaps; and / or, The inner ring, the outer ring, and the connecting arm are connected as one unit.

3. The cooling assembly according to claim 1, characterized in that, The cooling fluid flow port includes an inlet on the inlet member and an outlet on the outlet member. The inlet is arranged on the axial end face of the inlet member, and the outlet is arranged on the radial end face of the outlet member.

4. The cooling assembly according to claim 3, characterized in that, The inlet includes an outer inlet arranged on the outer ring and an inner inlet arranged on the inner ring. The outlet is arranged on both sides of the outer ring along its axial direction and avoids the outer inlet.

5. The cooling assembly according to claim 4, characterized in that, The winding unit includes a plurality of iron cores arranged at circumferential intervals, with gaps formed between adjacent iron cores; Wherein, the inner inlet corresponds one-to-one with the gap; and / or, Each of the external inlets corresponds to one of the iron cores.

6. The cooling assembly according to claim 3, characterized in that, The outlet is arranged on the inner circumferential surface of the outlet.

7. The cooling assembly according to claim 6, characterized in that, At least one of the inlet ports and the outlet ports are spatially offset.

8. The cooling assembly according to claim 7, characterized in that, The outlet component has a plurality of outlets arranged on it, and the plurality of outlets are spaced apart on the inner circumferential surface of the outlet component.

9. The cooling assembly according to claim 1, characterized in that, The difference between the number of outflowing components and the number of inflowing components is 1.

10. The cooling assembly according to claim 9, characterized in that, Each of the inlet members has an outlet member arranged on both sides of its axial direction.

11. The cooling assembly according to claim 1, characterized in that, The sealed cavity wall is provided with a limiting structure, and the inlet and / or outlet are engaged on the limiting structure.

12. The cooling assembly according to claim 1, characterized in that, The motor housing has an annular stator housing for fixing the winding unit and the cooling assembly. The cooling assembly also includes an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe extend from the stator housing into the sealing cavity. The inlet pipe is connected to the inlet element or extends from the inlet end of the inlet element to facilitate the introduction of cooling fluid into the inlet element. The outlet pipe is connected to the outlet element or extends from the outlet end of the outlet element to facilitate the extraction of cooling fluid from the outlet element.

13. An electric motor, characterized in that, It includes a stator assembly, a rotor assembly, and a cooling assembly as described in any one of claims 1 to 11.

14. The motor according to claim 13, characterized in that, At least one of the inlet and the outlet are not on the same radial divergence line.

15. The motor according to claim 13, characterized in that, It includes a pair of rotor assemblies arranged on both sides of the axial direction of the stator assembly.

16. A vehicle, characterized in that, Includes the motor described in any one of claims 13 to 15.

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