Motor cooling assembly, motor, electric drive device and vehicle

Abstract

The application discloses a motor cooling assembly, a motor, an electric drive device and a vehicle. The motor cooling assembly comprises a shell, a stator and a partition. The shell is provided with a containing cavity. The stator is arranged in the containing cavity and connected with the shell. The partition is arranged in the gap between the stator and the shell in the axial direction of the stator, and is used for separating the gap into a closed first cavity and a second cavity. The first cavity is used for containing a first cooling medium. The first cooling medium is in contact with the stator and can be phase changed into a second cooling medium to cool the stator. The second cavity is in communication with the first cavity and is used for containing the second cooling medium. In the application, the first cooling medium is in contact with the stator and can be phase changed into the second cooling medium. Therefore, the first cooling medium can absorb the heat of the stator in the form of latent heat of vaporization, so that not only can the damage of the stator under the action of high temperature during the operation of the motor be prevented, the stability and reliability of the motor can be ensured, but also the cooling efficiency of the stator can be improved.

Description

Technical Field

[0001] This application relates to the field of drive equipment technology, and more specifically, to an electric motor cooling assembly, an electric motor, an electric drive device, and a vehicle. Background Technology

[0002] With the continuous development of new energy vehicles, users have increasingly higher requirements for motor performance. In related technologies, a motor consists of a stator and a rotor, with the rotor capable of movement relative to the stator. During motor operation, frequent changes in power and speed generate a large amount of heat. If the motor cannot be effectively cooled and dissipated, it will be damaged under high temperatures; for example, the motor stator may be damaged under high temperatures. This will affect the stability and reliability of the motor's operation. Therefore, how to effectively cool and dissipate heat from motors has become a crucial technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] This application provides an electric motor cooling assembly, an electric motor, an electric drive device, and a vehicle to solve at least one of the aforementioned technical problems.

[0004] The motor cooling assembly of this application includes a housing, a stator, and a separator. The housing has a receiving cavity. The stator is disposed in the receiving cavity and connected to the housing. The separator is disposed in the axial gap between the stator and the housing, and is used to divide the gap into a closed first cavity and a second cavity. The first cavity is used to contain a first cooling medium, which is in contact with the stator and can undergo a phase change to form a second cooling medium to cool the stator. The second cavity communicates with the first cavity and is used to contain the second cooling medium.

[0005] In some embodiments, the first cooling medium is a liquid phase change medium, and the second cooling medium is a gaseous phase change medium.

[0006] In some embodiments, the stator includes a stator core and a stator winding, the stator core being connected to the inner wall of the housing in the radial direction of the stator, the stator winding being disposed on the stator core, and a portion of the stator winding extending into the first cavity and contacting the first cooling medium.

[0007] In some embodiments, the separator includes a connecting portion and a separating portion. The two opposite ends of the connecting portion are respectively connected to opposite sides of the gap in the axial direction of the stator. The separating portion extends from the connecting portion toward the stator by bending and is connected to the inner wall of the housing in the radial direction of the stator. In the axial direction of the stator, the separating portion is spaced apart from both the stator and the housing.

[0008] In some embodiments, the partition includes a first sub-part, a second sub-part, and a third sub-part. The first sub-part extends from the connecting portion toward the inner wall. The second sub-part is connected to the end of the first sub-part away from the connecting portion and extends toward the stator. The third sub-part is connected to the end of the second sub-part away from the first sub-part and extends toward the inner wall, and in the axial direction of the stator, the third sub-part is closer to the stator than the first sub-part.

[0009] In some embodiments, the partition is provided with a through hole for connecting the first cavity and the second cavity, so that the second cooling medium in the first cavity can enter the second cavity.

[0010] In some embodiments, the partition includes a first side and a second side facing away from each other, the first side of the partition facing the first cavity and the second side of the partition facing the second cavity. The first side of the partition is recessed and extends towards the second cavity to form a protrusion and a boss cavity, the opening of the boss cavity communicating with the first cavity, the through hole penetrating the protrusion and communicating with the boss cavity, and the first cooling medium is spaced apart from the opening of the boss cavity in the radial direction of the stator.

[0011] In some embodiments, a blocking portion is provided at the opening of the boss cavity, the blocking portion protruding from the partition portion toward the center of the opening of the boss cavity, the blocking portion being used to reduce the size of the opening of the boss cavity.

[0012] In some embodiments, the housing is provided with a first through hole and a second through hole. The first through hole communicates with the first cavity and is used to allow the first cooling medium to flow into the first cavity. The second through hole communicates with the second cavity and is used to allow the second cooling medium to flow out of the second cavity.

[0013] In some embodiments, the first cavity includes two cavities, and the stator includes a first end and a second end opposite to each other along its axial direction. The two first cavities are located at the first end and the second end of the stator, respectively. The stator is provided with a flow channel, and the first through hole includes one, which communicates with both first cavities through the flow channel.

[0014] In some embodiments, the first cavity includes two cavities, and the stator includes a first end and a second end opposite to each other along the axial direction of the stator. The two first cavities are located at the first end and the second end of the stator, respectively. The stator is provided with a flow channel, and the first through hole includes one. One of the two first cavities communicates with the first through hole and is also connected to the other of the two first cavities through the flow channel.

[0015] In some embodiments, the first cavity includes two, and the stator includes a first end and a second end opposite each other along the axial direction of the stator, with the two first cavities located at the first end and the second end of the stator, respectively. The first through hole includes two, and the two first through holes communicate with the two first cavities, respectively.

[0016] In some embodiments, the motor cooling assembly further includes a cooling component disposed outside the housing and used to cool the second cooling medium so that the second cooling medium is converted back into the first cooling medium.

[0017] In some embodiments, the cooling component includes a first cooling unit and a second cooling unit. The first cooling unit communicates with the second through hole and is used to supply the flow of the second cooling medium. The second cooling unit is used to supply coolant, which is used for non-contact heat exchange with the second cooling medium to cool the second cooling medium.

[0018] In some embodiments, the first cooling unit includes a condenser and a condensation pipe, the condensation pipe being connected to the second through hole and used to supply the second cooling medium to flow to the condenser, the coolant being used to cool the second cooling medium in the condenser; the cooling component further includes a return liquid unit, the return liquid unit being connected to both the condenser and the first through hole, the return liquid unit being used to output the first cooling medium in the condenser to the first through hole.

[0019] In some embodiments, the liquid return unit includes a liquid return tank and a power element. The liquid return tank is connected to the condenser and is used to store the first cooling medium in the condenser. The power element is connected to both the liquid return tank and the first through hole, and is used to output the first cooling medium in the liquid return tank to the first through hole.

[0020] In some embodiments, the return channel is located closer to the housing than the condenser in the radial direction of the stator.

[0021] The motor in this application includes the motor cooling assembly described in any of the above embodiments.

[0022] In some embodiments, the motor further includes a rotor disposed in the receiving cavity and corresponding to the stator, the rotor being movable relative to the stator.

[0023] The electric drive device of this application includes the motor described in any of the above embodiments.

[0024] The vehicle in this application includes the electric drive device described in the above embodiments.

[0025] In the motor cooling assembly, motor, electric drive device, and vehicle of the present application embodiments, a separator is disposed in the gap between the stator and the housing in the axial direction of the stator, and is used to divide the gap into a closed first cavity and a second cavity. The first cavity can contain a first cooling medium. The first cooling medium contacts the stator and can undergo a phase change to form a second cooling medium. Thus, the first cooling medium can absorb the heat of the stator by means of latent heat of vaporization, thereby not only preventing the stator from being damaged under high temperature during motor operation and ensuring the stability and reliability of motor operation, but also improving the cooling efficiency of the stator.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0028] Figure 1 This is a structural schematic diagram of a vehicle according to certain embodiments of this application;

[0029] Figure 2 yes Figure 1 A cross-sectional schematic diagram of one embodiment of the motor of the electric drive device in the vehicle shown.

[0030] Figure 3 yes Figure 2 A schematic diagram of the partition structure of the motor cooling assembly in the motor shown;

[0031] Figure 4 yes Figure 1 A cross-sectional schematic diagram of another embodiment of the motor of the electric drive device in the vehicle shown.

[0032] Figure 5 yes Figure 4 Enlarged view of section V;

[0033] Figure 6 yes Figure 1 A cross-sectional schematic diagram of another embodiment of the motor of the electric drive device in the vehicle shown.

[0034] Explanation of key component symbols:

[0035] 600 vehicles; 500 electric drive units;

[0036] 400 controller; 300 motor;

[0037] 100 Motor cooling assembly; 200 Rotor; 110 Clearance; 130 First cavity; 150 Second cavity; X-axis; 220 Shaft;

[0038] 10 Housing, 11 Accommodating cavity, 13 First through hole, 15 Second through hole;

[0039] 30 Stator, 31 Stator Core, 33 Stator Winding, 35 Flow Channel;

[0040] 50. Divider, 51. Connecting part, 53. Divider, 5301. First side, 5303. Second side, 531. First sub-part, 533. Second sub-part, 535. Third sub-part, 536. Through hole, 537. Protrusion, 538. Boss cavity, 5381. Opening, 539. Covering part;

[0041] 70 Cooling components, 71 First cooling unit, 711 Condenser, 713 Condensation pipe, 73 Second cooling unit, 75 Liquid return unit, 751 Liquid return tank. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] Please see Figure 1 The vehicle 600 in this embodiment includes an electric drive unit 500. It should be noted that, in some embodiments, the vehicle 600 includes, but is not limited to, passenger vehicles such as pure electric vehicles and hybrid vehicles, as well as large engineering vehicles operating under relatively mild conditions.

[0048] Since the vehicle 600 in this embodiment includes an electric drive unit 500, it is understood that the vehicle 600 has at least the same beneficial effects as the electric drive unit 500. Therefore, for the beneficial effects of the vehicle 600, please refer to the beneficial effects of the electric drive unit 500 described below.

[0049] Please continue reading. Figure 1 The electric drive device 500 of this application includes a motor 300. Further, in some embodiments, the electric drive device 500 may also include a controller 400, which is electrically connected to the motor 300 and is used to control the operation of the motor 300. The motor 300 may include, but is not limited to, a linear motor, a rotary motor, and a bidirectional motor.

[0050] Since the electric drive device 500 in this embodiment includes a motor 300, it is understood that the electric drive device 500 has at least the same beneficial effects as the motor 300. Therefore, for the beneficial effects of the electric drive device 500, please refer to the beneficial effects of the motor 300 described below.

[0051] Please see Figure 2 , Figure 4 or Figure 6The motor 300 in this embodiment includes a motor cooling assembly 100. Since the motor 300 in this embodiment includes a motor cooling assembly 100, it is understood that the motor 300 has at least the same beneficial effects as the motor cooling assembly 100. Therefore, for the beneficial effects of the motor 300, please refer to the beneficial effects of the motor cooling assembly 100 described below.

[0052] Please see Figure 2 , Figure 4 or Figure 6 The motor cooling assembly 100 of this application includes a housing 10, a stator 30, and a separator 50. The housing 10 has a receiving cavity 11. The stator 30 is disposed in the receiving cavity 11 and connected to the housing 10. The separator 50 is disposed in a gap 110 between the stator 30 and the housing 10 in the axial direction X of the stator 30, and is used to divide the gap 110 into a closed first cavity 130 and a second cavity 150. The first cavity 130 is used to contain a first cooling medium, which is in contact with the stator 30 and can undergo a phase change to form a second cooling medium to cool the stator 30. The second cavity 150 communicates with the first cavity 130 and is used to contain the second cooling medium.

[0053] The housing 10 is a structure in the motor cooling assembly 100 used to house and protect the stator 30 and the separator 50, among other devices. The housing 10 may be, but is not limited to, cylindrical, triangular prism, and polygonal prism shapes. In some embodiments of this application, the housing 10 may be substantially cylindrical. The material of the housing 10 may be metallic or non-metallic. Metallic materials include, but are not limited to, cast iron, aluminum, iron, steel, or aluminum alloys, while non-metallic materials include, but are not limited to, plastics. In one example, the housing 10 may be made of a metallic material, such as aluminum alloy, which can improve the structural strength of the housing 10, reduce the possibility of collision damage to the housing 10 during motor 300 operation, and improve the stability and reliability of motor 300 operation. In another example, the housing 10 may be made of a non-metallic material, which can make the housing 10 lighter, thereby facilitating the lightweight design of the motor 300.

[0054] The stator 30 is disposed in the receiving cavity 11 and connected to the inner wall of the housing 10. In one example, the stator 30 and the housing 10 can be joined together by a detachable connection method, including but not limited to snap-fit ​​or bolt connection. In another example, the stator 30 and the housing 10 can be joined together by a non-detachable connection method, including but not limited to welding or bonding.

[0055] In some embodiments of this application, a gap 110 is provided between the stator 30 and the housing 10 along the axial direction X. Specifically, the stator 30 includes opposing first and second ends along the axial direction X, and a gap 110 is provided between the first end and / or the second end of the stator 30 and the housing 10 along the axial direction X; that is, there is one gap 110; or, there are two gaps 110. It is understood that the number of gaps 110 and spacers 50 is in a one-to-one relationship, that is, one spacer 50 is provided in one gap 110.

[0056] The separator 50 is disposed in the gap 110 and can divide the gap 110 into a closed first cavity 130 and a second cavity 150, so that the first cavity 130 can accommodate the first cooling medium and the second cavity 150 can accommodate the second cooling medium. In some embodiments, the separator 50 is connected to both the housing 10 and the stator 30, and sealing elements are provided at the connection between the separator 50 and the housing 10, and at the connection between the separator 50 and the stator 30. The sealing elements can seal the gap 110 between the separator 50 and the housing 10, and seal the gap 110 between the separator 50 and the stator 30, thereby ensuring the sealing effect of the first cavity 130 and the second cavity 150.

[0057] In the motor cooling assembly 100 of this application embodiment, the separator 50 is disposed in the gap 110 between the stator 30 and the housing 10 in the axial direction X of the stator 30, and is used to divide the gap 110 into a closed first cavity 130 and a second cavity 150. The first cavity 130 can contain a first cooling medium. The first cooling medium contacts the stator 30 and can undergo a phase change to form a second cooling medium to cool the stator 30. Thus, the first cooling medium can absorb the heat of the stator 30 in the form of latent heat of vaporization, thereby not only preventing the stator 30 from being damaged under high temperature during the operation of the motor 300 and ensuring the stability and reliability of the motor 300, but also improving the cooling efficiency of the stator 30.

[0058] The motor cooling assembly 100 will be further explained below with reference to the accompanying drawings.

[0059] Please see Figure 2 , Figure 4 or Figure 6In some embodiments, the first cooling medium is a liquid phase change medium, and the second cooling medium is a gaseous phase change medium. It should be noted that the first and second cooling media are only used to distinguish different states of the same phase change medium, and are not limited to the first and second cooling media being different phase change media. As described above, the first cooling medium can undergo a phase change to form the second cooling medium; correspondingly, the second cooling medium can also undergo a phase change to form the first cooling medium. The first cooling medium includes, but is not limited to, liquid Freon, fluorinated liquids, or nonafluorobutyl methyl ether; the second cooling medium includes, but is not limited to, gaseous Freon, fluorinated liquids, or nonafluorobutyl methyl ether.

[0060] Specifically, in some embodiments, during the operation of the motor 300, when the first cooling medium flows into the first cavity 130 and comes into contact with the stator 30, the first cooling medium can undergo a phase change to form a second cooling medium, that is, the first cooling medium can vaporize to form a second cooling medium. In this way, the first cooling medium can absorb a large amount of heat from the stator 30 by utilizing the latent heat of phase change, thereby achieving rapid cooling of the stator 30.

[0061] If the second cavity 150 is not provided, meaning the motor cooling assembly 100 only includes the first cavity 130, the second cooling medium will quickly fill the first cavity 130 after the first cooling medium undergoes a phase change to form the second cooling medium. This will increase the pressure in the first cavity 130, affecting the contact between the first cooling medium and the stator 30, and hindering the phase change of the first cooling medium to cool the stator 30, resulting in lower overall cooling efficiency. In some embodiments of this application, the second cooling medium formed by the phase change of the first cooling medium can enter the second cavity 150. This separates the first and second cooling media, preventing the second cooling medium from being located in the first cavity 130 and causing a decrease in the cooling effect of the first cooling medium on the stator 30, thereby improving the overall cooling efficiency.

[0062] Please see Figure 2 , Figure 4 or Figure 6 In some embodiments, the motor 300 further includes a rotor 200 disposed in the accommodating cavity 11 and corresponding to the stator 30, and the rotor 200 is capable of moving relative to the stator 30.

[0063] Furthermore, in some embodiments, the stator 30 includes a stator core 31 and a stator winding 33. The stator core 31 is connected to the inner wall of the housing 10 in the radial direction (perpendicular to the axial direction X of the stator 30), and the stator winding 33 is disposed on the stator core 31.

[0064] The stator core 31 is typically made of a material with high magnetic permeability, low hysteresis, good thermal stability, and corrosion resistance. For example, the material of the stator core 31 includes, but is not limited to, silicon steel sheets and magnetic stainless steel. In one example, the stator core 31 can be formed by stacking multiple silicon steel sheets along the axial direction X of the stator 30. When current flows through the stator winding 33, the stator winding 33 can generate a magnetic field, which can act on the rotor 200, causing the rotor 200 to move relative to the stator 30.

[0065] For example, the rotor 200 may include magnets. When the stator winding 33 is energized, the stator winding 33 generates a magnetic field, and the magnetic field generated by the stator winding 33 interacts with the magnetic field of the magnets, thereby causing the rotor 200 to rotate relative to the stator 30. It is understood that in some embodiments, in addition to magnets, the rotor 200 may also include other permanent magnets, such as magnetite, etc. When the stator winding 33 is energized, the magnetic field generated by the stator winding 33 can interact with the magnetic field of the permanent magnets to cause the rotor 200 to rotate relative to the stator 30.

[0066] Furthermore, in some embodiments, the motor 300 also includes a rotating shaft 220. The rotating shaft 220 is a device for connecting the rotating parts inside the motor 300 to external equipment and for transmitting torque. In some embodiments of this application, the rotating shaft 220 passes through the housing 10 and is rotatable relative to the housing 10. The rotor 200 is sleeved on the rotating shaft 220 and is rotatable synchronously with the rotating shaft 220. The rotating shaft 220 can be made of metallic or non-metallic materials, wherein metallic materials include, but are not limited to, aluminum, iron, steel, or aluminum alloys, and non-metallic materials include, but are not limited to, plastics.

[0067] In some embodiments, a portion of the stator winding 33 extends into the first cavity 130 and comes into contact with the first cooling medium. In other words, the first cooling medium can immerse the portion of the stator winding 33 extending into the first cavity 130 for cooling. Thus, when the stator winding 33 is energized, the heat generated by the stator winding 33 can be directly transferred to the first cooling medium. This reduces resistance during heat transfer, improving cooling efficiency, and also achieves uniform heat dissipation from the stator winding 33, further enhancing the cooling effect.

[0068] Please see Figure 2 , Figure 4 or Figure 6 and combined Figure 3In some embodiments, the separator 50 includes a connecting portion 51 and a separating portion 53. The opposite ends of the connecting portion 51 are respectively connected to opposite sides of the gap 110 in the axial direction X of the stator 30. The separating portion 53 extends from the connecting portion 51 toward the stator 30 by bending, and is connected to the inner wall of the housing 10 in the radial direction of the stator 30. In the axial direction X of the stator 30, the separating portion 53 is spaced apart from both the stator 30 and the housing 10.

[0069] Specifically, in some embodiments, the connecting portion 51 may extend along the axial direction X of the stator 30, and the opposite ends of the connecting portion 51 are respectively connected to the opposite sides of the stator 30 and the housing 10 along the axial direction X of the stator 30. One end of the partition portion 53 is connected to the connecting portion 51, and the other end bends and extends from the connecting portion 51 toward the stator 30, and is connected to the inner wall of the housing 10 in the radial direction of the stator 30. The stator 30, the housing 10, the partition portion 53, and the connecting portion 51 together form a first cavity 130; the housing 10, the partition portion 53, and the connecting portion 51 together form a second cavity 150. Therefore, compared to the partition portion 53 extending radially from the connecting portion 51 towards the housing 10 along the stator 30, the partition portion 53 extending bently from the connecting portion 51 towards the stator 30 can make the volume of the first cavity 130 smaller, thereby allowing the first cooling medium to quickly fill the first cavity 130 and avoiding the problem of thermal islanding of the motor 300 caused by the first cooling medium not being able to quickly fill the first cavity 130. That is, it avoids the problem of uneven heat dissipation of the first cooling medium to the stator 30 caused by the first cooling medium not being able to quickly fill the first cavity 130, thereby improving the heat dissipation effect of the first cooling medium on the stator 30.

[0070] In some embodiments, the connecting portion 51 and the partition portion 53 may be an integral structure, that is, the connecting portion 51 and the partition portion 53 are integrally molded into one piece. This can improve the bonding strength between the connecting portion 51 and the partition portion 53, prevent the connecting portion 51 and the partition portion 53 from separating during the operation of the motor 300, and thus ensure the normal operation of the motor 300. In other embodiments, the connecting portion 51 and the partition portion 53 may be separate structures, that is, the connecting portion 51 and the partition portion 53 are two different structures. The connecting portion 51 and the partition portion 53 may be combined using a detachable connection method or a non-detachable connection method. Detachable connection methods include, but are not limited to, snap-fit ​​or bolt connections; non-detachable connection methods include, but are not limited to, adhesive or welding.

[0071] Furthermore, please combine Figure 3In some embodiments, the partition 53 includes a first sub-part 531, a second sub-part 533, and a third sub-part 535. The first sub-part 531 extends from the connecting part 51 toward the inner wall. The second sub-part 533 is connected to the end of the first sub-part 531 away from the connecting part 51 and extends toward the stator 30. The third sub-part 535 is connected to the end of the second sub-part 533 away from the first sub-part 531 and extends toward the inner wall. In the axial direction X of the stator 30, the third sub-part 535 is closer to the stator 30 than the first sub-part 531.

[0072] In the stator 30, the third sub-part 535 is closer to the stator 30 than the first sub-part 531 along the axial X direction. Thus, compared to the distance between the third sub-part 535 and the stator 30 along the axial X direction being the same as the distance between the first sub-part 531 and the stator 30, the volume of the first cavity 130 is smaller. This allows the first cooling medium to quickly fill the first cavity 130, improving the heat dissipation effect of the first cooling medium on the stator 30. On the other hand, it allows the second cooling medium, formed by the phase change of the first cooling medium, to quickly enter the second cavity 150, preventing the second cooling medium from interfering with the cooling of the stator 30 by the first cooling medium, thereby improving the cooling effect of the first cooling medium on the stator 30. Furthermore, compared to the distance between the third sub-part 535 and the stator 30 along the axial direction X of the stator 30 being the same as the distance between the first sub-part 531 and the stator 30, the second cavity 150 has a larger volume. This prevents the second cooling medium from being unable to fully enter the second cavity 150 when the amount of the second cooling medium formed by the phase change of the first cooling medium is large. In this way, it can be ensured that the cooling of the stator 30 by the first cooling medium is not affected by the second cooling medium.

[0073] In some embodiments, the partition 53 is provided with a through hole 536, which is used to connect the first cavity 130 and the second cavity 150 so that the second cooling medium in the first cavity 130 can enter the second cavity 150.

[0074] Specifically, in some embodiments, when the first cooling medium contacts the stator winding 33 and undergoes a phase change to form the second cooling medium, the pressure in the first cavity 130 increases, i.e., the intermolecular motion in the first cavity 130 intensifies, thereby allowing the second cooling medium in the first cavity 130 to enter the second cavity 150 through the through hole 536. It is understood that in some embodiments, the through hole 536 includes at least one. Where multiple through holes 536 are included, the multiple through holes 536 can be spaced apart along the circumferential direction of the stator 30 on the partition portion 53, thereby facilitating the entry of the second cooling medium in the first cavity 130 into the second cavity 150.

[0075] Please see Figure 4 or Figure 6 and combined Figure 5 In some embodiments, the partition 53 includes a first side 5301 and a second side 5303 facing away from each other. The first side 5301 of the partition 53 faces the first cavity 130, and the second side 5303 of the partition 53 faces the second cavity 150. The first side 5301 of the partition 53 is recessed towards the second cavity 150 and extends to form a protrusion 537 and a boss cavity 538. The opening 5381 of the boss cavity 538 communicates with the first cavity 130. A through hole 536 passes through the protrusion 537 and communicates with the boss cavity 538. In the radial direction of the stator 30, a first cooling medium is spaced apart from the opening 5381 of the boss cavity 538.

[0076] Specifically, in some embodiments, when the first cooling medium undergoes a phase change to form the second cooling medium, the second cooling medium can sequentially enter the second cavity 150 through the opening 5381 of the boss cavity 538, the boss cavity 538, and the through hole 536. Furthermore, in the radial direction of the stator 30, the first cooling medium is spaced apart from the opening 5381 of the boss cavity 538. Therefore, compared to a system without the protrusion 537 and the boss cavity 538, the first cooling medium is less likely to contact the through hole 536, thereby reducing the possibility of the first cooling medium entering the second cavity 150 through the through hole 536. This ensures that there is sufficient first cooling medium in the first cavity 130, guaranteeing the cooling effect of the first cooling medium on the stator 30.

[0077] It should be noted that in some embodiments, the radial direction of the stator 30 may be approximately the same as the direction of gravity. In this case, the first cooling medium is spaced apart from the opening 5381 of the boss cavity 538, that is, the opening 5381 of the boss cavity 538 is located above the first cooling medium in the direction of gravity. Thus, the first cooling medium can be located below the opening 5381 of the boss cavity 538 under the action of gravity and maintain a distance from the opening 5381 of the boss cavity 538.

[0078] In some embodiments, a shielding portion 539 is provided at the opening 5381 of the boss cavity 538. The shielding portion 539 extends protruding from the partition portion 53 toward the center of the opening 5381 of the boss cavity 538, and the shielding portion 539 is used to reduce the size of the opening 5381 of the boss cavity 538. Therefore, the shielding portion 539 reduces the possibility of the first cooling medium entering the boss cavity 538 through the opening 5381 when splashing occurs, thereby ensuring the amount of the first cooling medium in the first cavity 130 and improving the cooling effect of the motor cooling assembly 100.

[0079] Please see Figure 2 , Figure 4 or Figure 6In some embodiments, the housing 10 is provided with a first through hole 13 and a second through hole 15. The first through hole 13 communicates with the first cavity 130 and is used to allow the first cooling medium to flow into the first cavity 130. The second through hole 15 communicates with the second cavity 150 and is used to allow the second cooling medium to flow out of the second cavity 150.

[0080] Specifically, in some embodiments, the external first cooling medium can flow into the first cavity 130 through the first through hole 536, and can undergo phase change in the first cavity 130 to form a second cooling medium to cool and dissipate heat from the stator 30; at the same time, the second cooling medium formed by the phase change of the first cooling medium can enter the second cavity 150 and flow out of the second cavity 150 through the second through hole 15.

[0081] Furthermore, please combine Figure 2 or Figure 4 In some embodiments, the first cavity 130 includes two cavities, which are located at the first end and the second end of the stator 30, respectively. The stator 30 is provided with a flow channel 35, and a first through hole 13 is included, which is connected to both first cavities 130 through the flow channel 35.

[0082] Specifically, in some embodiments, the first through hole 13 may be located between the first end and the second end of the stator 30 along the axial direction X of the stator 30. In this way, when the first cooling medium enters the two first cavities 130 through the first through hole 13 and the flow channel 35, the rate at which the first cooling medium enters the two first cavities 130 is the same, thereby ensuring the uniformity of cooling of the first end and the second end of the stator 30 by the first cooling medium and improving the cooling effect.

[0083] Please combine Figure 6 In other embodiments, the first cavity 130 includes two cavities, which are located at the first end and the second end of the stator 30, respectively. The stator 30 is provided with a flow channel 35, and the first through hole 13 includes one. One of the two first cavities 130 (hereinafter referred to as the first sub-cavity) communicates with the first through hole 13 and is also communicated with the other of the two first cavities 130 (hereinafter referred to as the second sub-cavity) through the flow channel 35.

[0084] Specifically, in some embodiments, the first through hole 13 is connected to the first sub-cavity, and the first cooling medium can flow directly into the first sub-cavity through the first through hole 536, and the first cooling medium in the first sub-cavity can flow into the second sub-cavity through the flow channel 35, thereby cooling the first end and the second end of the stator 30 with the first cooling medium.

[0085] In some embodiments, the first cavity 130 includes two cavities, which are located at the first end and the second end of the stator 30, respectively. The first through hole 13 includes two holes, which communicate with the two first cavities 130 respectively. Thus, the first cooling medium can flow into the two first cavities 130 through the two first through holes 13, thereby improving the cooling efficiency of the first cooling medium on the stator 30.

[0086] Please see Figure 2 , Figure 4 or Figure 6 In some embodiments, the motor cooling assembly 100 further includes a cooling component 70 disposed outside the housing 10 and used to cool a second cooling medium so that the second cooling medium is converted back into a first cooling medium.

[0087] Specifically, in some embodiments, when the second cooling medium in the second cavity 150 flows into the cooling component 70, the cooling component 70 can cool the second cooling medium to cause the second cooling medium to undergo a phase change to form the first cooling medium, thereby achieving cyclic cooling of the stator 30.

[0088] Furthermore, in some embodiments, the cooling component 70 includes a first cooling unit 71 and a second cooling unit 73. The first cooling unit 71 communicates with the second through hole 15 and is used to supply the flow of the second cooling medium. The second cooling unit 73 is used to supply the flow of coolant, which is used for non-contact heat exchange with the second cooling medium to cool the second cooling medium.

[0089] Specifically, in some embodiments, the non-contact heat exchange between the coolant and the second cooling medium can be described as follows: the coolant and the second cooling medium do not come into contact with each other, yet heat transfer is still possible. In this non-contact heat exchange, heat in the second cooling medium can be transferred to the coolant, thereby cooling the second cooling medium and transforming it into the first cooling medium. It is understood that the temperature of the coolant is lower than the temperature of the second cooling medium.

[0090] It should be noted that, in some embodiments, the second cooling unit may be the vehicle 600's own water system; that is, the second cooling unit may also cool and dissipate heat from other heat-generating devices in the vehicle 600. The coolant may be water or a coolant, including but not limited to ethylene glycol, propylene glycol, fluorinated liquids, or synthetic oils (such as silicone oil).

[0091] More specifically, in some embodiments, the first cooling unit 71 includes a condenser 711 and a condensing pipe 713. The condensing pipe 713 is connected to the second through hole 15 and is used to supply the second cooling medium to the condenser 711. The coolant is used to cool the second cooling medium in the condenser 711. The cooling component 70 also includes a return liquid unit 75, which is connected to both the condenser 711 and the first through hole 13. The return liquid unit 75 is used to output the first cooling medium in the condenser 711 to the first through hole 13.

[0092] Furthermore, in some embodiments, the liquid return unit 75 includes a liquid return tank 751 and a power element. The liquid return tank 751 is connected to the condenser 711 and is used to store the first cooling medium in the condenser 711. The power element is connected to both the liquid return tank 751 and the first through hole 13, and is used to output the first cooling medium in the liquid return tank 751 to the first through hole 13.

[0093] The return liquid tank 751 is a structure capable of holding a certain amount of liquid. The return liquid tank 751 may include, but is not limited to, a groove structure or a structure with a receiving cavity. The power element is a structure capable of conveying the first cooling medium in the return liquid tank 751 to the first through hole 13. The power element may be a pump or other structure capable of suction. Specifically, in some embodiments, when the second cooling medium in the condenser 711 is cooled and transformed into the first cooling medium, the first cooling medium can flow into the return liquid tank 751 and be drawn back to the first through hole 536 by the power element, thereby realizing the circulation of the phase change medium in the motor cooling assembly 100.

[0094] In some embodiments, the return fluid channel 751 is closer to the housing 10 than the condenser 711 in the radial direction of the stator 30. Specifically, when the radial direction of the stator 30 is approximately the same as the direction of gravity, the return fluid channel 751 is closer to the housing 10 than the condenser 711. That is, in the direction of gravity, the return fluid channel 751 is located below the condenser 711. In this way, the first cooling medium in the condenser 711 can flow into the return fluid channel 751 under the action of gravity, without the need for a power element to pump the first cooling medium in the condenser 711, thereby reducing the power consumption of the power element.

[0095] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Furthermore, other implementation methods can be derived from the above embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0096] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electric machine cooling assembly (100), characterized by, The application relates to a shell (10) provided with a containing cavity (11), a stator (30) arranged in the containing cavity (11) and connected with the shell (10), and a partition (50) arranged in a gap (110) between the stator (30) and the shell (10) in the axial direction of the stator (30) and used for separating the gap (110) into a closed first cavity (130) for containing a first cooling medium which is in contact with the stator (30) and can be phase changed into a second cooling medium to cool the stator (30) and a second cavity (150) in communication with the first cavity (130) and used for containing the second cooling medium. The first cooling medium is a liquid phase change medium, and the second cooling medium is a gaseous phase change medium. The stator (30) comprises a stator core (31) connected to the inner wall of the shell (10) in the radial direction of the stator (30) and a stator winding (33) arranged in the stator core (31), and part of the stator winding (33) extends into the first cavity (130) and is in contact with the first cooling medium. The partition (50) comprises a connecting portion (51) having opposite two ends connected to the opposite two sides of the gap (110) in the axial direction of the stator (30) and a partition portion (53) bent and extended from the connecting portion (51) towards the stator (30) and connected with the inner wall of the shell (10) in the radial direction of the stator (30), and the partition portion (53) is spaced from the stator (30) and the shell (10) in the axial direction of the stator (30). The partition portion (53) comprises a first sub-portion (531) extended from the connecting portion (51) towards the inner wall, a second sub-portion (533) connected to one end of the first sub-portion (531) away from the connecting portion (51) and extended towards the stator (30), and a third sub-portion (535) connected to one end of the second sub-portion (533) away from the first sub-portion (531) and extended towards the inner wall, and the third sub-portion (535) is closer to the stator (30) than the first sub-portion (531) in the axial direction of the stator (30).

2. The electric machine cooling assembly (100) of claim 1, characterized in that, The partition portion (53) is provided with a through hole (536) for communicating the first cavity (130) and the second cavity (150) so that the second cooling medium in the first cavity (130) enters the second cavity (150).

3. The electric machine cooling assembly (100) of claim 1, characterized in that, ​ ​ ​ 4. The electric machine cooling assembly (100) of claim 3, characterized in that, ​ ​ ​ ​ 5. The electric machine cooling assembly (100) of claim 3, characterized in that, ​ 6. The electric machine cooling assembly (100) of claim 5, characterized in that, The partition (53) comprises opposite first and second sides (5301, 5303), the first side (5301) of the partition (53) faces the first cavity (130), and the second side (5303) of the partition (53) faces the second cavity (150); The first side (5301) of the partition (53) is recessed towards the second cavity (150) and extends to form a protrusion (537) and a boss cavity (538), the opening (5381) of the boss cavity (538) is in communication with the first cavity (130), the through hole (536) penetrates the protrusion (537) and is in communication with the boss cavity (538), and in the radial direction of the stator (30), the first cooling medium is spaced from the opening (5381) of the boss cavity (538).

7. The electric machine cooling assembly (100) of claim 6, characterized by The opening (5381) of the boss cavity (538) is provided with a shielding portion (539), the shielding portion (539) extends from the partition (53) to the center of the opening (5381) of the boss cavity (538), and the shielding portion (539) is used to reduce the size of the opening (5381) of the boss cavity (538).

8. The electric machine cooling assembly (100) according to any one of claims 1-7, characterized in that, The housing (10) is provided with a first through hole (13) and a second through hole (15), the first through hole (13) is in communication with the first cavity (130) and is used for the first cooling medium to flow into the first cavity (130), and the second through hole (15) is in communication with the second cavity (150) and is used for the second cooling medium to flow out of the second cavity (150).

9. The electric machine cooling assembly (100) of claim 8, characterized in that, The first cavity (130) comprises two, the stator (30) comprises opposite first and second ends in the axial direction of the stator (30), and the two first cavities (130) are respectively located at the first end of the stator (30) and the second end of the stator (30); The stator (30) is provided with a flow channel (35), the first through hole (13) comprises one, and the first through hole (13) is in communication with both of the first cavities (130) through the flow channel (35); or, The stator (30) is provided with a flow channel (35), the first through hole (13) comprises one, one of the two first cavities (130) is in communication with the first through hole (13), and the other of the two first cavities (130) is in communication with the first through hole (13) through the flow channel (35); or, The first through hole (13) comprises two, and the two first through holes (13) are respectively in communication with the two first cavities (130).

10. The electric machine cooling assembly (100) of claim 8, characterized by, The motor cooling assembly (100) further comprises: A cooling component (70) is arranged outside the housing (10) and is used for cooling the second cooling medium to make the second cooling medium change back to the first cooling medium.

11. The electric machine cooling assembly (100) of claim 10, characterized in that, The cooling component (70) comprises: A first cooling unit (71) is in communication with the second through hole (15) and is used for the second cooling medium to flow; and A second cooling unit (72) is in communication with the first through hole (13) and is used for the first cooling medium to flow. A second cooling unit (73) for flowing a cooling liquid for non-contact heat exchange with the second cooling medium to cool the second cooling medium.

12. The electric machine cooling assembly (100) of claim 11, characterized by The first cooling unit (71) comprises a condenser (711) and a condenser pipeline (713) in communication with the second through hole (15) and for flowing the second cooling medium to the condenser (711) for cooling the second cooling medium in the condenser (711); the cooling component (70) further comprises: A return liquid unit (75) in communication with the condenser (711) and the first through hole (13), the return liquid unit (75) for outputting the first cooling medium in the condenser (711) to the first through hole (13).

13. The electric machine cooling assembly (100) of claim 12, characterized in that, The return liquid unit (75) comprises: A return liquid tank (751) connected with the condenser (711) and for storing the first cooling medium in the condenser (711); and A power element in communication with the return liquid tank (751) and the first through hole (13), the power element for outputting the first cooling medium in the return liquid tank (751) to the first through hole (13).

14. The electric machine cooling assembly (100) of claim 13, characterized by In the radial direction of the stator (30), the return liquid tank (751) is closer to the shell (10) than the condenser (711).

15. An electric machine (300) characterized by The motor cooling assembly (100) according to any one of claims 1-14. The motor (300) further comprises:

16. The electric machine (300) of claim 15, characterized in that, A rotor (200) arranged in the accommodating cavity (11) and corresponding to the stator (30), the rotor (200) being capable of moving relative to the stator (30). The motor (300) according to claim 15 or 16.

17. An electric drive device (500), characterized in that The electric drive device (500) according to claim 17. ​ 18. A vehicle (600), characterized by ​ ​

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