Motor cooling assembly, motor, electric drive device and vehicle

Abstract

The invention discloses a motor cooling assembly, a motor, an electric drive device and a vehicle. The motor cooling assembly comprises a housing, a stator and a separator. The shell is provided with an accommodating cavity. The stator is arranged in the accommodating cavity and is connected with the shell; the separator is arranged in a 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 closed second cavity, the first cavity is used for accommodating a first cooling medium, the first cooling medium is in contact with the stator and can be subjected to phase change to form a second cooling medium to cool the stator, and the second cavity is communicated with the first cavity; the second cavity is used for containing a second cooling medium. According to the invention, the first cooling medium is in contact with the stator and can be subjected to phase change to form the second cooling medium, so that the first cooling medium can absorb the heat of the stator in a latent heat of vaporization manner, thereby preventing the stator from being damaged under the action of high temperature in the operation process of the motor, and guaranteeing the working stability and reliability of the motor. And the cooling efficiency of the stator can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of drive equipment, and more specifically, to a motor cooling assembly, a motor, an electric drive device and a vehicle. Background Art

[0002] With the continuous development of new energy vehicles, users have higher and higher requirements for the performance of motors. In related technologies, the motor includes a stator and a rotor, and the rotor can move relative to the stator. During the operation of the motor, with the frequent changes in power and speed, the motor will generate a lot of heat. If the motor cannot be effectively cooled and dissipated, the motor will be damaged under the action of high temperature. For example, the motor stator is damaged under the action of high temperature, which will affect the stability and reliability of the motor. Therefore, how to effectively cool the motor has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The embodiments of the present application provide a motor cooling assembly, a motor, an electric drive device and a vehicle to solve at least one of the above-mentioned technical problems.

[0004] The motor cooling assembly of the embodiment of the present application includes a housing, a stator and a separator. The housing is provided with a housing cavity. The stator is arranged in the housing cavity and connected to the housing. The separator is arranged in the gap between the stator and the housing in the axial direction of the stator, and is used to separate the gap into a closed first cavity and a second cavity, the first cavity is used to accommodate a first cooling medium, the first cooling medium is in contact with the stator, and can be phase-changed to form a second cooling medium to cool the stator, and the second cavity is connected to the first cavity, and the second cavity is used to accommodate 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 is connected to the inner wall of the shell in the radial direction of the stator, the stator winding is arranged on the stator core, and part of the stator winding extends into the first cavity and contacts with 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 is bent and extended from the connecting portion toward the stator, 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 from both the stator and the housing.

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

[0009] In some embodiments, a through hole is provided on the partition, and the through hole is used to connect the first cavity and the second cavity so that the second cooling medium in the first cavity enters the second cavity.

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

[0011] In some embodiments, a shielding portion is provided at the opening of the boss cavity, and the shielding portion protrudes and extends from the partition portion toward the center of the opening of the boss cavity, and the shielding portion is used to reduce the opening size of the boss cavity.

[0012] In some embodiments, the shell is provided with a first through hole and a second through hole, the first through hole is connected to the first cavity and is used for the first cooling medium to flow into the first cavity, and the second through hole is connected to the second cavity and is used for the second cooling medium to flow out of the second cavity.

[0013] In some embodiments, the first chambers include two, the stator includes a first end and a second end opposite to each other in the axial direction of the stator, and the two first chambers are located at the first end of the stator and the second end of the stator, respectively. The stator is provided with a flow channel, the first through hole includes one, and the first through hole is connected to both of the first chambers through the flow channel.

[0014] In some embodiments, the first chambers include two, the stator includes a first end and a second end opposite to each other in the axial direction of the stator, and the two first chambers are respectively located at the first end of the stator and the second end of the stator. The stator is provided with a flow channel, the first through hole includes one, one of the two first chambers is communicated with the first through hole, and is communicated with the other of the two first chambers through the flow channel.

[0015] In some embodiments, the first cavities include two, the stator includes a first end and a second end opposite to each other in the axial direction of the stator, and the two first cavities are located at the first end of the stator and the second end of the stator, respectively. The first through holes include two, and the two first through holes are connected to the two first cavities, respectively.

[0016] In certain embodiments, the motor cooling assembly further includes a cooling component, which is disposed outside the housing and configured to cool the second cooling medium so as to convert the second cooling medium 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 is connected to the second through hole and is used for the second cooling medium to flow. The second cooling unit is used for the flow of a coolant, and the coolant 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 is connected to the second through hole and is used to supply the second cooling medium to the condenser, and the coolant is used to cool the second cooling medium in the condenser; the cooling component also includes a liquid return unit, the liquid return unit is connected to the condenser and the first through hole, and the liquid return unit is 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 the power element is used to output the first cooling medium in the liquid return tank to the first through hole.

[0020] In certain embodiments, in the radial direction of the stator, the liquid return groove is closer to the housing than the condenser.

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

[0022] In some embodiments, the motor further includes a rotor, which is disposed in the accommodating cavity and corresponds to the stator, and the rotor can move relative to the stator.

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

[0024] The vehicle according to the embodiment of the present application includes the electric drive device described in the above embodiment.

[0025] In the motor cooling assembly, motor, electric drive device and vehicle of the embodiments of the present application, a partition is arranged 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 accommodate a first cooling medium, and the first cooling medium is in contact with the stator and can undergo a phase change to form a second cooling medium. As a result, the first cooling medium can absorb the heat of the stator in the form of latent heat of vaporization, thereby not only preventing the stator from being damaged by high temperature during the operation of the motor and ensuring the stability and reliability of the motor operation, but also improving the cooling efficiency of the stator.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 is a schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0029] Figure 2 yes Figure 1 A schematic cross-sectional view of an embodiment of an electric motor of an electric drive device in a vehicle is shown;

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

[0031] Figure 4 yes Figure 1 A schematic cross-sectional view of another embodiment of an electric motor of an electric drive device in a vehicle is shown;

[0032] Figure 5 yes Figure 4 The enlarged schematic diagram of point V in the middle;

[0033] Figure 6 yes Figure 1 A schematic cross-sectional view of another embodiment of an electric motor of an electric drive device in a vehicle is shown.

[0034] Description of main component symbols:

[0035] 600 vehicles; 500 electric drive units;

[0036] 400 controller; 300 motor;

[0037] 100 motor cooling assembly; 200 rotor; 110 gap; 130 first cavity; 150 second cavity; X-axis direction; 220 rotating 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 partition, 51 connecting portion, 53 partition, 5301 first side, 5303 second side, 531 first sub-portion, 533 second sub-portion, 535 third sub-portion, 536 through hole, 537 protruding portion, 538 boss cavity, 5381 opening, 539 shielding portion;

[0041] 70 cooling component, 71 first cooling unit, 711 condenser, 713 condensation pipe, 73 second cooling unit, 75 liquid return unit, 751 liquid return tank. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0043] In the description of the present application, it should be understood that the terms "center", "length", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] See also Figure 1 The vehicle 600 of the embodiment of the present application includes an electric drive device 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 and large engineering vehicles with not very bad working conditions.

[0048] Among them, since the vehicle 600 in this embodiment includes the electric drive device 500, it can be understood that the vehicle 600 at least includes the same beneficial effects as the electric drive device 500. Therefore, for the beneficial effects of the vehicle 600, please refer to the beneficial effects of the electric drive device 500 described below.

[0049] Please continue reading Figure 1 The electric drive device 500 of the embodiment of the present application includes a motor 300. Further, in some embodiments, the electric drive device 500 may also include a controller 400, the controller 400 is electrically connected to the motor 300, and the controller 400 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, a bidirectional motor, etc.

[0050] Among them, since the electric drive device 500 in this embodiment includes the motor 300, it can be understood that the electric drive device 500 at least includes 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] See also Figure 2 , Figure 4 or Figure 6, the motor 300 of the embodiment of the present application includes the motor cooling assembly 100. Among them, since the motor 300 in the present embodiment includes the motor cooling assembly 100, it can be understood that the motor 300 includes at least the same beneficial effects as the motor cooling assembly 100, therefore, the beneficial effects of the motor 300 refer to the beneficial effects of the motor cooling assembly 100 described below.

[0052] See also Figure 2 , Figure 4 or Figure 6 The motor cooling assembly 100 of the embodiment of the present application includes a housing 10, a stator 30 and a partition 50. The housing 10 is provided with a receiving cavity 11. The stator 30 is disposed in the receiving cavity 11 and connected to the housing 10. The partition 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 separate the gap 110 into a closed first cavity 130 and a second cavity 150, the first cavity 130 is used to accommodate a first cooling medium, the first cooling medium is in contact with the stator 30, and can be phase-changed to form a second cooling medium to cool the stator 30, the second cavity 150 is communicated with the first cavity 130, and the second cavity 150 is used to accommodate a second cooling medium.

[0053] Among them, the housing 10 is a structure used to load and protect the stator 30 and the separator 50 and other devices in the motor cooling assembly 100. The housing 10 may include but is not limited to a cylindrical, triangular prism and polygonal prism. In some embodiments of the present application, the housing 10 may be roughly cylindrical. The material of the housing 10 may be a metal material or a non-metal material. Metal materials include but are not limited to cast iron, aluminum, iron, steel or aluminum alloy, and non-metal materials include but are not limited to plastic. In one example, the housing 10 may be made of a metal material, for example, the housing 10 may be made of an aluminum alloy material, thereby improving the structural strength of the housing 10, reducing the possibility of collision damage to the housing 10 during the operation of the motor 300, and improving the stability and reliability of the motor 300. In another example, the housing 10 may be made of a non-metal material, thereby making the weight of the housing 10 lighter, which is conducive to achieving the lightweight of the motor 300.

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

[0055] In some embodiments of the present application, in the axial direction X of the stator 30, there is a gap 110 between the stator 30 and the housing 10. Specifically, the stator 30 includes a first end and a second end opposite to each other in the axial direction X of the stator 30, and in the axial direction X of the stator 30, there is a gap 110 between the first end of the stator 30 and / or the second end of the stator 30 and the housing 10, that is, the gap 110 includes one; or, the gap 110 includes two. It can be understood that the relationship between the number of gaps 110 and the number of partitions 50 is one-to-one, that is, one partition 50 is provided in one gap 110.

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

[0057] In the motor cooling assembly 100 of the embodiment of the present application, the partition 50 is arranged in the gap 110 between the stator 30 and the housing 10 on 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 accommodate a first cooling medium, and the first cooling medium is in contact with the stator 30 and can undergo a phase change to form a second cooling medium to cool the stator 30. As a result, 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, ensuring the stability and reliability of the operation of the motor 300, but also improving the cooling efficiency of the stator 30.

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

[0059] See also 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 cooling medium and the second cooling medium are only used to distinguish different states of the same phase change medium, and are not limited to the first cooling medium and the second cooling medium being different phase change media. As described above, the first cooling medium can phase change to form the second cooling medium; accordingly, the second cooling medium can also phase change to form the first cooling medium. Among them, the first cooling medium includes but is not limited to liquid Freon, fluorinated liquid or nonafluorobutyl methyl ether, etc.; the second cooling medium includes but is not limited to gaseous Freon, fluorinated liquid or nonafluorobutyl methyl ether, etc.

[0060] Specifically, in some embodiments, during the operation of the motor 300, when the first cooling medium flows into the first cavity 130 and contacts 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 the second cooling medium. In this way, the first cooling medium can absorb a large amount of heat from the stator 30 by means of latent heat of phase change, thereby achieving rapid cooling of the stator 30.

[0061] If the second cavity 150 is not provided, that is, the motor cooling assembly 100 only includes the first cavity 130, after the first cooling medium undergoes a phase change to form the second cooling medium, the second cooling medium will quickly fill the first cavity 130, which will cause the pressure in the first cavity 130 to increase, affecting the contact between the first cooling medium and the stator 30 and affecting the phase change of the first cooling medium to cool the stator 30, thereby resulting in a low overall cooling efficiency. In certain embodiments of the present application, the second cooling medium formed by the phase change of the first cooling medium can enter the second cavity 150, so that the first cooling medium and the second cooling medium can be separated, preventing the second cooling medium formed by the phase change of the first cooling medium from being located in the first cavity 130, causing the cooling effect of the first cooling medium on the stator 30 to decrease, thereby improving the overall cooling efficiency.

[0062] See also Figure 2 , Figure 4 or Figure 6 In some embodiments, the motor 300 further includes a rotor 200 , which is disposed in the accommodating cavity 11 and corresponds to the stator 30 , and the rotor 200 can move 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 of the stator 30 (perpendicular to the axial direction X of the stator 30 ), and the stator winding 33 is arranged on the stator core 31 .

[0064] The stator core 31 is usually made of a material with high magnetic permeability, low magnetic hysteresis, good thermal stability and corrosion resistance. Exemplarily, 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 a plurality of silicon steel sheets along the axial direction X of the stator 30. When current is passed through the stator winding 33, the stator winding 33 can generate a magnetic field, and the magnetic field generated by the stator winding 33 can act on the rotor 200 to make the rotor 200 move relative to the stator 30.

[0065] Exemplarily, the rotor 200 may include magnetic steel, and when the stator winding 33 is energized, the stator winding 33 can generate a magnetic field, and the magnetic field generated by the stator winding 33 interacts with the magnetic field of the magnetic steel, so that the rotor 200 can rotate relative to the stator 30. It can be understood that in some embodiments, in addition to the magnetic steel, the rotor 200 may also include other permanent magnets, such as magnetite, etc., and 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 magnet, so that the rotor 200 can rotate relative to the stator 30.

[0066] Furthermore, in some embodiments, the motor 300 further includes a rotating shaft 220. The rotating shaft 220 is a device for connecting the rotating part inside the motor 300 and an external device and capable of transmitting torque. In some embodiments of the present application, the rotating shaft 220 passes through the housing 10 and can rotate relative to the housing 10. The rotor 200 is sleeved on the rotating shaft 220 and can rotate synchronously with the rotating shaft 220. The material of the rotating shaft 220 can be a metal material and a non-metal material, wherein the metal material includes but is not limited to aluminum, iron, steel or aluminum alloy, and the non-metal material includes but is not limited to plastic, etc.

[0067] In some embodiments, part of the stator winding 33 extends into the first cavity 130 and contacts the first cooling medium. In other words, the first cooling medium can immerse and cool the part of the stator winding 33 extending into the first cavity 130, so that when the stator winding 33 is energized, the heat generated by the stator winding 33 can be directly transferred to the first cooling medium, thereby reducing the resistance encountered during the heat transfer process and improving the cooling efficiency on the one hand, and achieving uniform heat dissipation of the stator winding 33 and improving the cooling effect on the other hand.

[0068] See also Figure 2 , Figure 4 or Figure 6 , and combined with Figure 3In some embodiments, the separator 50 includes a connecting portion 51 and a separating portion 53. The two opposite ends of the connecting portion 51 are respectively connected to the opposite sides of the gap 110 in the axial direction X of the stator 30. The separating portion 53 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. In the axial direction X of the stator 30, the separating portion 53 is spaced from both the stator 30 and the housing 10.

[0069] Specifically, in some embodiments, the connection portion 51 may extend along the axial direction X of the stator 30, and the opposite ends of the connection portion 51 are respectively connected to the stator 30 and the opposite sides of the housing 10 in the axial direction X of the stator 30. One end of the partition 53 is connected to the connection portion 51, and the other end is bent and extended from the connection 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 53 and the connection portion 51 together form the first cavity 130; the housing 10, the partition 53 and the connection portion 51 together form the second cavity 150. Therefore, compared with the partition 53 extending from the connecting portion 51 toward the housing 10 along the radial direction of the stator 30, the partition 53 bending and extending from the connecting portion 51 toward the stator 30 can make the volume of the first cavity 130 smaller, so that the first cooling medium can quickly fill the first cavity 130, thereby avoiding the problem of thermal island of the motor 300 caused by the inability of the first cooling medium to quickly fill the first cavity 130, that is, avoiding the problem of uneven heat dissipation of the stator 30 by the first cooling medium due to the inability of the first cooling medium 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 connection portion 51 and the partition portion 53 may be an integral structure, that is, the connection portion 51 and the partition portion 53 are an integral structure made by integral molding, so that the bonding strength of the connection portion 51 and the partition portion 53 can be improved, and the connection portion 51 and the partition portion 53 can be prevented from being separated during the operation of the motor 300, thereby ensuring the normal operation of the motor 300. In other embodiments, the connection portion 51 and the partition portion 53 may be a split structure, that is, the connection portion 51 and the partition portion 53 are two different structures. Among them, the connection portion 51 and the partition portion 53 can be combined together by a detachable connection method or a non-detachable connection method. The detachable connection method includes but is not limited to a snap-on or bolt connection, etc.; the non-detachable connection method includes but is not limited to bonding or welding, etc.

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

[0072] Among them, in the axial direction X of the stator 30, the third sub-section 535 is closer to the stator 30 than the first sub-section 531. In this way, compared with the distance between the third sub-section 535 and the stator 30 and the distance between the first sub-section 531 and the stator 30 being the same in the axial direction X of the stator 30, the volume of the first cavity 130 is smaller. Therefore, on the one hand, the first cooling medium can quickly fill the first cavity 130, thereby improving the heat dissipation effect of the first cooling medium on the stator 30; on the other hand, the second cooling medium formed by the phase change of the first cooling medium can quickly enter the second cavity 150, thereby 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 with the distance between the third sub-portion 535 and the stator 30 being the same as the distance between the first sub-portion 531 and the stator 30 in the axial direction X of the stator 30, the volume of the second cavity 150 is larger, thereby preventing the second cooling medium from being unable to completely 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, thereby ensuring that the cooling of the stator 30 by the first cooling medium will not be affected by the second cooling medium.

[0073] In some embodiments, a through hole 536 is disposed on the partition 53 , and the through hole 536 is used to connect 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 .

[0074] Specifically, in some embodiments, when the first cooling medium contacts the stator winding 33 and undergoes phase change to form the second cooling medium, the pressure in the first cavity 130 increases, that is, the intermolecular motion in the first cavity 130 intensifies, so that the second cooling medium in the first cavity 130 can enter the second cavity 150 through the through hole 536. It can be understood that in some embodiments, the through hole 536 includes at least one. In the case where the through hole 536 includes a plurality of through holes, the plurality of through holes 536 can be arranged on the partition 53 at intervals along the circumferential direction of the stator 30, so that the second cooling medium in the first cavity 130 can enter the second cavity 150.

[0075] See also Figure 4 or Figure 6 , and combined with Figure 5 In some embodiments, the partition 53 includes a first side 5301 and a second side 5303 opposite to 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 and extended toward the second cavity 150 to form a protrusion 537 and a boss cavity 538. The opening 5381 of the boss cavity 538 is connected to the first cavity 130. The through hole 536 passes through the protrusion 537 and is connected to the boss cavity 538. In the radial direction of the stator 30, the first cooling medium is spaced 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 pass through the opening 5381 of the boss cavity 538, the boss cavity 538, and the through hole 536 to enter the second cavity 150. In addition, in the radial direction of the stator 30, the first cooling medium is spaced from the opening 5381 of the boss cavity 538, so that, compared with the case where the protrusion 537 and the boss cavity 538 are not provided, it is difficult for the first cooling medium 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, thereby ensuring that there is enough first cooling medium in the first cavity 130, and ensuring 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 substantially the same as the gravity direction. At this time, 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 gravity direction, so that the first cooling medium can be located below the opening 5381 of the boss cavity 538 under the action of gravity and maintain a space between 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, and the shielding portion 539 protrudes and extends from the partition 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 provision of the shielding portion 539 can reduce the possibility of the first cooling medium entering the boss cavity 538 through the opening 5381 of the boss cavity 538 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] See also Figure 2 , Figure 4 or Figure 6In some embodiments, a first through hole 13 and a second through hole 15 are provided on the shell 10. The first through hole 13 is connected to the first cavity 130 and is used for allowing the first cooling medium to flow into the first cavity 130. The second through hole 15 is connected to the second cavity 150 and is used for allowing 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 a phase change in the first cavity 130 to form a second cooling medium to cool and dissipate heat for 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, 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, and the first through hole 13 includes one, and the first through hole 13 is connected to both first cavities 130 through the flow channel 35.

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

[0083] Please combine Figure 6 In other embodiments, the first cavity 130 includes two, 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, and the first through hole 13 includes one, and one of the two first cavities 130 (hereinafter referred to as the first sub-cavity) is communicated with the first through hole 13, and is 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, 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, so that the first cooling medium cools the first end of the stator 30 and the second end of the stator 30.

[0085] In some other embodiments, the first cavity 130 includes two, 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 first through holes 13 include two, and the two first through holes 13 are respectively connected to the two first cavities 130. Thus, the first cooling medium can flow into the two first cavities 130 through the two first through holes 13, respectively, so that the cooling efficiency of the stator 30 by the first cooling medium can be improved.

[0086] See also Figure 2 , Figure 4 or Figure 6 In some embodiments, the motor cooling assembly 100 further includes a cooling component 70, which is disposed outside the housing 10 and is used to cool the second cooling medium so that the second cooling medium is converted back into the 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] Further, in some embodiments, the cooling component 70 includes a first cooling unit 71 and a second cooling unit 73. The first cooling unit 71 is connected to the second through hole 15 and is used for the second cooling medium to flow. The second cooling unit 73 is used for the coolant to flow, and the coolant 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 may be: the coolant and the second cooling medium do not contact each other and can achieve heat transfer. Wherein, in the case of non-contact heat exchange between the second cooling medium and the coolant, the heat in the second cooling medium can be transferred to the coolant, so that the coolant cools the second cooling medium, so that the second cooling medium is converted 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 water circuit of the vehicle 600 itself, that is, the second cooling unit may also cool and dissipate heat for other heat generating devices in the vehicle 600. The coolant may be water or a coolant, and the coolant includes but is not limited to ethylene glycol, propylene glycol, fluorinated liquid or synthetic oil (such as silicone oil).

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

[0092] Further, 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 the liquid return tank 751 and the first through hole 13, and the power element is used to output the first cooling medium in the liquid return tank 751 to the first through hole 13.

[0093] Among them, the liquid return groove 751 is a structure that can accommodate a certain amount of liquid. The liquid return groove 751 may include but is not limited to a groove structure, or a structure with a accommodating cavity, etc. The power element is a structure that can transport the first cooling medium in the liquid return groove 751 to the first through hole 13. The power element can 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 converted into the first cooling medium, the first cooling medium can flow into the liquid return groove 751 and be sucked 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, in the radial direction of the stator 30, the liquid return groove 751 is closer to the housing 10 than the condenser 711. Specifically, when the radial direction of the stator 30 is substantially the same as the direction of gravity, the liquid return groove 751 is closer to the housing 10 than the condenser 711, that is, in the direction of gravity, the liquid return groove 751 is located below the condenser 711, so that the first cooling medium in the condenser 711 can flow into the liquid return groove 751 under the action of gravity, and there is no need for the 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 above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0096] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A motor cooling assembly (100), characterized in that: include: A housing (10), wherein the housing (10) is provided with a receiving cavity (11); a stator (30), the stator (30) being disposed in the accommodating cavity (11) and connected to the housing (10); and A partition (50), wherein the partition (50) is disposed in a gap (110) between the stator (30) and the housing (10) in the axial direction of the stator (30), and is used to separate the gap (110) into a closed first cavity (130) and a second cavity (150), wherein the first cavity (130) is used to accommodate a first cooling medium, the first cooling medium is in contact with the stator (30) and can undergo a phase change to form a second cooling medium to cool the stator (30), and the second cavity (150) is communicated with the first cavity (130), and the second cavity (150) is used to accommodate the second cooling medium.

2. The motor cooling assembly (100) according to claim 1, characterized in that: The first cooling medium is a liquid phase change medium, and the second cooling medium is a gaseous phase change medium.

3. The motor cooling assembly (100) according to claim 1, characterized in that: The stator (30) comprises 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 of the stator (30); the stator winding (33) is arranged on the stator core (31); a portion of the stator winding (33) extends into the first cavity (130) and contacts the first cooling medium.

4. The motor cooling assembly (100) according to claim 1, characterized in that: The separator (50) comprises: A connecting portion (51), wherein opposite ends of the connecting portion (51) are respectively connected to opposite sides of the gap (110) in the axial direction of the stator (30); and A partition (53), wherein the partition (53) is bent and extended 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); in the axial direction of the stator (30), the partition (53) is spaced from both the stator (30) and the housing (10).

5. The motor cooling assembly (100) according to claim 4, characterized in that: The partition (53) comprises: A first sub-portion (531), the first sub-portion (531) extending from the connecting portion (51) toward the inner wall; a second sub-portion (533), the second sub-portion (533) being connected to an end of the first sub-portion (531) away from the connecting portion (51) and extending toward the stator (30); and A third sub-portion (535), wherein the third sub-portion (535) is connected to an end of the second sub-portion (533) away from the first sub-portion (531) and extends toward the inner wall. In the axial direction of the stator (30), the third sub-portion (535) is closer to the stator (30) than the first sub-portion (531).

6. The motor cooling assembly (100) according to claim 4, characterized in that: The partition (53) is provided with a through hole (536), and the through hole (536) is used to connect 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).

7. The motor cooling assembly (100) according to claim 6, characterized in that: The partition (53) comprises a first side (5301) and a second side (5303) which are opposite to 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 toward the second cavity (150) and extends to form a protrusion (537) and a boss cavity (538); an opening (5381) of the boss cavity (538) is connected to the first cavity (130); the through hole (536) passes through the protrusion (537) and is connected to the boss cavity (538); in the radial direction of the stator (30), the first cooling medium is spaced from the opening (5381) of the boss cavity (538).

8. The motor cooling assembly (100) according to claim 7, characterized in that: A shielding portion (539) is provided at the opening (5381) of the boss cavity (538), and the shielding portion (539) protrudes and extends 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).

9. The motor cooling assembly (100) according to any one of claims 1 to 8, characterized in that: The shell (10) is provided with a first through hole (13) and a second through hole (15); the first through hole (13) is connected to the first cavity (130) and is used for the first cooling medium to flow into the first cavity (130); the second through hole (15) is connected to the second cavity (150) and is used for the second cooling medium to flow out of the second cavity (150).

10. The motor cooling assembly (100) according to claim 9, characterized in that: The first cavities (130) include two, the stator (30) includes a first end and a second end opposite to each other 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) includes one, and the first through hole (13) is connected to both of the first chambers (130) through the flow channel (35); or, The stator (30) is provided with a flow channel (35), the first through hole (13) includes one, one of the two first chambers (130) is communicated with the first through hole (13), and is communicated with the other of the two first chambers (130) through the flow channel (35); or, The first through holes (13) include two, and the two first through holes (13) are respectively connected to the two first cavities (130).

11. The motor cooling assembly (100) according to claim 9, characterized in that: The motor cooling assembly (100) further comprises: A cooling component (70) is disposed outside the housing (10) and is used to cool the second cooling medium so as to convert the second cooling medium back into the first cooling medium.

12. The motor cooling assembly (100) according to claim 11, characterized in that: The cooling component (70) comprises: a first cooling unit (71), the first cooling unit (71) being in communication with the second through hole (15) and being used for allowing the second cooling medium to flow; and The second cooling unit (73) is used for supplying cooling liquid to flow, and the cooling liquid is used for non-contact heat exchange with the second cooling medium to cool the second cooling medium.

13. The motor cooling assembly (100) according to claim 12, characterized in that: The first cooling unit (71) comprises a condenser (711) and a condensation pipe (713), wherein the condensation pipe (713) is in communication with the second through hole (15) and is used for allowing the second cooling medium to flow to the condenser (711), and the coolant is used for cooling the second cooling medium in the condenser (711); the cooling component (70) further comprises: A liquid return unit (75), the liquid return unit (75) being in communication with the condenser (711) and the first through hole (13), the liquid return unit (75) being used to output the first cooling medium in the condenser (711) to the first through hole (13).

14. The motor cooling assembly (100) according to claim 13, characterized in that: The liquid return unit (75) comprises: a liquid return tank (751), the liquid return tank (751) being connected to the condenser (711) and being used to store the first cooling medium in the condenser (711); and A power element is connected to both the liquid return groove (751) and the first through hole (13), and the power element is used to output the first cooling medium in the liquid return groove (751) to the first through hole (13).

15. The motor cooling assembly (100) according to claim 14, characterized in that: In the radial direction of the stator (30), the liquid return groove (751) is closer to the shell (10) than the condenser (711).

16. A motor (300), characterized in that: include: The motor cooling assembly (100) according to any one of claims 1 to 15.

17. The electric machine (300) according to claim 16, characterized in that The motor (300) further comprises: A rotor (200), wherein the rotor (200) is disposed in the accommodating cavity (11) and corresponds to the stator (30), and the rotor (200) is capable of moving relative to the stator (30).

18. An electric drive device (500), characterized in that: include: The electric machine (300) as claimed in claim 16 or 17.

19. A vehicle (600), characterized in that: include: The electric drive device (500) as claimed in claim 18.

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