Stator cooling structure, motor and vehicle

Abstract

A stator cooling structure, a motor, and a vehicle. The stator cooling structure comprises a housing, the housing is configured to accommodate a stator, and the housing and the stator enclose to form at least one cooling chamber.

Description

Stator cooling structure, motor and vehicle

[0001] This application claims priority to Chinese patent application No. 202411552436.1, filed on October 31, 2024; Chinese patent application No. 202411550948.4, filed on October 31, 2024; Chinese patent application No. 202411550759.7, filed on October 31, 2024; and Chinese patent application No. 202411550920.0, filed on October 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of vehicle technology, and more particularly to a stator cooling structure, an electric motor, and a vehicle. Background Technology

[0003] The electric motor is a core component of a vehicle, driving it. Axial flux motors, as a type of electric motor, are widely used. Axial flux motors generate considerable heat during operation. To improve the efficiency of axial flux motors, cooling of the stator is necessary. Summary of the Invention

[0004] This disclosure provides a stator cooling structure, an electric motor, and a vehicle.

[0005] In a first aspect, a stator cooling structure is provided, the stator cooling structure being configured to cool a stator, the stator cooling structure including a housing configured to accommodate the stator, the housing and the stator enclosing each other to form at least one cooling chamber, the housing being provided with a cooling medium channel; the stator cooling structure further including a cooling assembly, the cooling medium channel being connected to the cooling chamber through the cooling assembly.

[0006] In some embodiments, the cooling chamber includes a first cooling chamber and a second cooling chamber along the radial direction of the stator, the first cooling chamber being located outside the second cooling chamber, the first cooling chamber being configured to cool the radially outer side of the stator, and the second cooling chamber being configured to cool the radially inner side of the stator.

[0007] In some embodiments, the cooling assembly includes a first cooling assembly and a second cooling assembly, the first cooling assembly and the second cooling assembly being arranged radially apart along the stator;

[0008] The first cooling component is disposed within the first cooling chamber, and the first cooling component connects the cooling medium channel and the first cooling chamber;

[0009] The second cooling component is disposed in the second cooling chamber, and the second cooling component connects the cooling medium channel and the second cooling chamber.

[0010] In some embodiments, the first cooling assembly includes at least one first spray pipe disposed about the axis of the stator, and the first spray pipe has at least one first spray port communicating with the first cooling chamber.

[0011] In some embodiments, the second cooling assembly includes at least one second spray pipe, the second spray pipe being disposed around the axis of the stator, and the second spray pipe having at least one second spray port communicating with the second cooling chamber.

[0012] In some embodiments, the stator cooling structure satisfies at least one of the following: the at least one first spray pipe includes at least two first spray pipes, the at least two first spray pipes being spaced apart along the axial direction of the stator; and the at least one second spray pipe includes at least two second spray pipes, the at least two second spray pipes being spaced apart along the axial direction of the stator.

[0013] In some embodiments, the stator cooling structure satisfies at least one of the following: the at least one first injection port includes a plurality of first injection ports, the plurality of first injection ports being arranged circumferentially spaced along the first injection pipe; and the at least one second injection port includes a plurality of second injection ports, the plurality of second injection ports being arranged circumferentially spaced along the second injection pipe.

[0014] In some embodiments, the second cooling assembly includes a second flow guide ring that divides the second cooling chamber into a second outer chamber and a second inner chamber. The second outer chamber is in communication with the cooling medium channel, and the second inner chamber is configured to cool the radially inner side of the stator. The second flow guide ring is provided with at least one second flow guide hole that communicates with the second outer chamber and the second inner chamber.

[0015] In some embodiments, the second guide ring extends axially along the stator so that the second outer chamber and the second inner chamber are distributed radially spaced along the stator; or, the second guide ring extends radially along the stator so that the second outer chamber and the second inner chamber are distributed axially spaced along the stator.

[0016] In some embodiments, the at least one second guide hole includes a plurality of second guide holes, the plurality of second guide holes satisfying at least one of the following: the plurality of second guide holes are spaced apart circumferentially along the second guide ring; the plurality of second guide holes are spaced apart axially along the second guide ring; and the plurality of second guide holes are spaced apart radially along the second guide ring.

[0017] In some embodiments, the first cooling assembly includes a first guide ring that divides the first cooling chamber into a first outer chamber and a first inner chamber. The first outer chamber is in communication with the cooling medium channel, and the first inner chamber is used to cool the radially inner side of the stator. The first guide ring is provided with at least one first guide hole that connects the first outer chamber and the first inner chamber.

[0018] In some embodiments, the first guide ring extends axially along the stator so that the first outer chamber and the first inner chamber are distributed radially spaced along the stator; or, the first guide ring extends radially along the stator so that the first outer chamber and the first inner chamber are distributed axially spaced along the stator.

[0019] In some embodiments, the at least one first guide hole includes a plurality of first guide holes, the plurality of first guide holes satisfying at least one of the following: the plurality of first guide holes are circumferentially spaced along the first guide ring; the plurality of first guide holes are axially spaced along the first guide ring; and the plurality of first guide holes are radially spaced along the first guide ring.

[0020] In some embodiments, the stator cooling structure further includes a seal disposed within the housing, the seal, the housing, and the stator enclosing to form the first cooling chamber and the second cooling chamber.

[0021] In some embodiments, the seal includes a first sealing portion and a second sealing portion connected together, the first sealing portion, the housing and the stator enclosing to form a first cooling chamber, and the first sealing portion, the second sealing portion, the housing and the stator enclosing to form a second cooling chamber.

[0022] In some embodiments, the first sealing portion is an annular structure extending radially along the stator, with its outer end connected to the housing and its inner end connected to the second sealing portion.

[0023] In some embodiments, the stator includes a stator core and a stator winding wound around the stator core, wherein at least a portion of the stator winding protrudes from the radially outer side and the radially inner side of the stator core to form a first end winding and a second end winding, respectively.

[0024] The first cooling chamber is configured to accommodate the first end winding and to cool the first end winding; the second cooling chamber is configured to accommodate the second end winding and to cool the second end winding.

[0025] In some embodiments, the stator core is provided with at least one mounting groove extending radially along the stator core on the side near the first sealing portion, the mounting groove being used to mount the stator winding; the first sealing portion includes at least one sealing strip, the sealing strip being adapted to be sealingly connected with the mounting groove.

[0026] In some embodiments, the at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core; the at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the first sealing portion, and one of the plurality of sealing strips is embedded in one of the plurality of mounting slots.

[0027] In some embodiments, the second sealing portion is a hollow cylindrical structure extending along the axial direction of the stator; along the axial direction of the stator, one end of the second sealing portion is connected to the inner end of the first sealing portion, and the other end of the second sealing portion is connected to the housing.

[0028] In some embodiments, the first sealing portion and the second sealing portion together form an integrally molded structure.

[0029] In some embodiments, the stator cooling structure further includes a first sealing ring disposed between the seal and the housing to provide a sealed connection between the seal and the housing.

[0030] In some embodiments, the stator cooling structure further includes a second sealing ring; the first cooling assembly includes a first guide ring connected to the housing, the first guide ring dividing the first cooling chamber into a first inner chamber and a first outer chamber, and the second sealing ring is disposed between the first guide ring and the housing to seal the first guide ring to the housing; or, the second cooling assembly includes a second guide ring connected to the housing, the second guide ring dividing the second cooling chamber into a second inner chamber and a second outer chamber, and the second sealing ring is disposed between the second guide ring and the housing to seal the second guide ring to the housing.

[0031] In some embodiments, the first guide ring is connected to the seal, and the first guide ring and the seal together form an integrally molded structure; or, the second guide ring is connected to the seal, and the second guide ring and the seal together form an integrally molded structure.

[0032] In some embodiments, the housing includes: an end plate and a side plate, the end plate being disposed on the side of the stator away from the seal; the side plate extending axially along the stator, one end of the side plate being connected to the outer peripheral end of the end plate; the end plate, the side plate, the seal, and the radially outer side of the stator enclose a first cooling chamber, and the end plate, the seal, and the radially inner side of the stator enclose a second cooling chamber.

[0033] In some embodiments, the cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel; the cooling medium inlet channel is connected to the first cooling chamber and the second cooling chamber respectively; the cooling medium outlet channel is connected to the first cooling chamber and the second cooling chamber respectively.

[0034] In some embodiments, the cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: the cooling medium inlet channel is disposed in at least one of the end plate and the side plate; and the cooling medium outlet channel is disposed in at least one of the end plate and the side plate.

[0035] In some embodiments, the cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes: a liquid inlet, a first connecting port and a second connecting port; the liquid inlet is configured to communicate with an external cooling device; the first connecting port and the second connecting port are arranged radially spaced along the stator, the first connecting port is connected to the first cooling chamber through the first cooling assembly, and the second connecting port is connected to the second cooling chamber through the second cooling assembly.

[0036] In some embodiments, the cooling medium inlet channel includes a plurality of sub-inlet channels, the plurality of sub-inlet channels having a straight segment structure, each of the plurality of sub-inlet channels intersecting and communicating with at least one other sub-inlet channel; one end of a portion of the plurality of sub-inlet channels is located at the outer peripheral end of the end plate and is closed, while one end of the remaining portion of the sub-inlet channels is located at the outer peripheral end of the end plate and forms the liquid inlet; at least one sub-inlet channel is provided with a first communication port, and at least one sub-inlet channel is provided with a second communication port.

[0037] In some embodiments, the cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes: a liquid outlet, a third connecting port and a fourth connecting port; the liquid outlet is configured to communicate with an external cooling device; the third connecting port and the fourth connecting port are arranged radially spaced along the stator, the third connecting port communicates with the first cooling chamber, and the fourth connecting port communicates with the second cooling chamber.

[0038] In some embodiments, the cooling medium outlet channel has a groove-shaped structure that extends radially along the stator; along the radial direction of the stator, the stator blocks the middle part of the groove opening of the cooling medium outlet channel, and the two ends of the groove opening of the cooling medium outlet channel are the third connecting port and the fourth connecting port, respectively.

[0039] In some embodiments, the cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: the cooling medium inlet channel is a liquid inlet, and the cooling medium outlet channel is a liquid outlet.

[0040] In some embodiments of the stator cooling structure disclosed herein, the housing and at least a portion of the stator enclose a cooling chamber, with at least a portion of the stator directly contacting the cooling medium within the cooling chamber. Therefore, in the stator cooling structure of some embodiments of this disclosure, at least a portion of the stator directly contacts the cooling medium for heat exchange, and the heat from the stator is carried away to the outside of the motor through the circulation of the cooling medium, thereby achieving stator cooling. This structure, where the stator directly contacts the cooling medium for heat exchange, significantly improves the stator cooling effect compared to structures that indirectly cool the stator.

[0041] In a second aspect, a stator cooling structure is provided, comprising: a housing and a cooling assembly. The housing is configured to accommodate a stator, and the housing and the stator enclose a cooling chamber; the cooling assembly divides the cooling chamber into an outer chamber and an inner chamber, and a cooling medium can enter the inner chamber from the outer chamber.

[0042] In some embodiments, the at least one cooling chamber includes two cooling chambers arranged radially spaced apart along the stator, the outer cooling chamber being a first cooling chamber configured to cool the radially outer side of the stator, and the inner cooling chamber being a second cooling chamber configured to cool the radially inner side of the stator.

[0043] In some embodiments, the stator cooling structure further includes a sealing element disposed within the housing, the sealing element, the housing, and the stator enclosing to form the first cooling chamber and the second cooling chamber.

[0044] In some embodiments, the stator includes a stator core and a stator winding wound around the stator core, wherein at least a portion of the stator winding protrudes radially outward and radially inward from the stator core to form a first end winding and a second end winding, respectively; the first cooling chamber is configured to accommodate the first end winding so that the cooling medium entering the first cooling chamber contacts the first end winding for heat exchange; the second cooling chamber is configured to accommodate the second end winding so that the cooling medium entering the second cooling chamber contacts the second end winding for heat exchange.

[0045] In some embodiments, the seal includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being radially spaced apart along the stator and located outside the second sealing ring; the first sealing ring, together with the housing and the stator, forms a first cooling chamber, and the second sealing ring, together with the housing and the stator, forms a second cooling chamber.

[0046] In some embodiments, the seal further includes a sealing portion disposed between the first sealing ring and the second sealing ring and connected to both the first sealing ring and the second sealing ring.

[0047] In some embodiments, the stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, the mounting groove being used to mount the stator winding; the sealing portion is at least one sealing strip, the sealing strip being adapted to be sealed to the mounting groove.

[0048] In some embodiments, the at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core; the at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the seal, and one of the sealing strips is embedded in one of the mounting slots.

[0049] In some embodiments, the first sealing ring, the second sealing ring, and the sealing strip together form an integrally molded structure.

[0050] In some embodiments, the seal and the cooling assembly are integrally formed.

[0051] In some embodiments, the stator cooling structure further includes a first sealing ring disposed between the seal and the housing to provide a sealed connection between the seal and the housing.

[0052] In some embodiments, the stator cooling structure further includes a second sealing ring disposed between the cooling assembly and the housing, so as to seal the cooling assembly and the housing.

[0053] In some embodiments, the cooling assembly includes a first cooling element and a second cooling element disposed radially spaced along the stator; the first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and the cooling medium can enter the first inner chamber from the first outer chamber; the second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and the cooling medium can enter the second inner chamber from the second outer chamber.

[0054] In some embodiments, the cooling medium pressure of the first outer chamber is greater than the cooling medium pressure of the first inner chamber, and the cooling medium pressure of the second outer chamber is greater than the cooling medium pressure of the second inner chamber.

[0055] In some embodiments, the first cooling element is a first spray ring, the first spray ring being provided with at least one first spray hole, the first spray hole being configured to spray the cooling medium of the first outer chamber into the first inner chamber.

[0056] In some embodiments, the at least one first spray hole includes a plurality of first spray holes, the plurality of first spray holes being spaced apart along at least one of the circumferential and axial directions of the first spray ring.

[0057] In some embodiments, the first spray ring extends axially along the stator so that the first outer chamber and the first inner chamber are radially spaced apart along the stator.

[0058] In some embodiments, the second cooling element is at least one second spray ring, the second spray ring being provided with a second spray hole, the second spray hole being configured to spray the cooling medium of the second outer chamber into the second inner chamber.

[0059] In some embodiments, the at least one second spray ring includes a plurality of second spray holes, the plurality of second spray holes being spaced apart along at least one of the circumferential and axial directions of the second spray ring.

[0060] In some embodiments, the second spray ring extends axially along the stator so that the second outer chamber and the second inner chamber are distributed radially spaced along the stator.

[0061] In some embodiments, the housing includes: an end plate, a first side plate, and a second side plate; the end plate is disposed at one end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; the end plate, the first side plate, the seal, and the stator enclose to form a first cooling chamber, and the end plate, the second side plate, the seal, and the stator enclose to form a second cooling chamber.

[0062] In some embodiments, the housing is provided with a cooling medium channel, which is connected to the first cooling chamber and the second cooling chamber respectively.

[0063] In some embodiments, the cooling medium channel includes an inlet channel and an outlet channel, the inlet channel being connected to the first outer chamber and the second outer chamber respectively, and the outlet channel being connected to the first inner chamber and the second inner chamber respectively.

[0064] In some embodiments, the inlet channel and the outlet channel satisfy at least one of the following: the inlet channel is disposed in at least one of the end plate and the first side plate; and the outlet channel is disposed in at least one of the end plate and the first side plate.

[0065] In some embodiments, the liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port and a second connecting port; the liquid inlet is configured to communicate with an external cooling device; the first connecting port and the second connecting port are arranged radially spaced along the stator, the first connecting port communicates with the first outer chamber, and the second connecting port communicates with the second outer chamber.

[0066] In some embodiments, the liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel; the first liquid inlet channel is connected to the first outer chamber; and the second liquid inlet channel is connected to the second outer chamber.

[0067] In some embodiments, the first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

[0068] In some embodiments, the liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port; the liquid outlet is configured to communicate with an external cooling device; the third connecting port and the fourth connecting port are arranged radially spaced along the stator, the third connecting port communicates with the first inner chamber, and the fourth connecting port communicates with the second inner chamber.

[0069] In some embodiments, the inlet channel and the outlet channel satisfy at least one of the following: the inlet channel is an inlet hole, and the outlet channel is an outlet hole.

[0070] In some embodiments of this disclosure, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling assembly divides the cooling chamber into an outer chamber and an inner chamber, when the stator is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator, which is beneficial to further improving the cooling effect of the stator.

[0071] Thirdly, a stator cooling structure is disclosed, comprising: a housing for accommodating a stator, the housing and the stator enclosing each other to form a cooling chamber; the housing is provided with a cooling medium channel, the cooling medium channel communicating with the cooling chamber to cool the stator.

[0072] In some embodiments, the cooling chamber includes a first cooling chamber and a second cooling chamber; the first cooling chamber and the second cooling chamber are radially spaced apart along the stator and located outside the second cooling chamber, the first cooling chamber being configured to cool the radially outer side of the stator, and the second cooling chamber being configured to cool the radially inner side of the stator.

[0073] In some embodiments, the stator cooling structure further includes a cooling assembly, the cooling assembly including a first cooling element and a second cooling element disposed radially spaced along the stator; the first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and a cooling medium can enter the first inner chamber from the first outer chamber; the second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and a cooling medium can enter the second inner chamber from the second outer chamber.

[0074] In some embodiments, the stator includes a stator core and a stator winding wound around the stator core, wherein at least a portion of the stator winding protrudes radially outward and radially inward from the stator core to form a first end winding and a second end winding, respectively; the first inner chamber is configured to accommodate the first end winding so that a cooling medium entering the first inner chamber contacts and exchanges heat with the first end winding; the second inner chamber is configured to accommodate the second end winding so that a cooling medium entering the second inner chamber contacts and exchanges heat with the second end winding.

[0075] In some embodiments, the cooling medium pressure of the first outer chamber is greater than the cooling medium pressure of the first inner chamber, and the cooling medium pressure of the second outer chamber is greater than the cooling medium pressure of the second inner chamber.

[0076] In some embodiments, the first cooling element is a first spray ring, the first spray ring being provided with at least one first spray hole, the first spray hole being configured to spray the cooling medium of the first outer chamber into the first inner chamber.

[0077] In some embodiments, the at least one first spray hole includes a plurality of first spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the first spray ring.

[0078] In some embodiments, the second cooling element is at least one second spray ring, the second spray ring being provided with a second spray hole, the second spray hole being configured to spray the cooling medium of the second outer chamber into the second inner chamber.

[0079] In some embodiments, the at least one second spray hole includes a plurality of second spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the second spray ring.

[0080] In some embodiments, the first spray ring extends radially along the stator so that the first outer chamber and the first inner chamber are spaced apart along the axial direction of the stator; the second spray ring extends radially along the stator so that the second outer chamber and the second inner chamber are spaced apart along the axial direction of the stator.

[0081] In some embodiments, the first spray ring extends radially along the stator so that the first outer chamber and the first inner chamber are spaced apart along the axial direction of the stator; the second spray ring extends axially along the stator so that the second outer chamber and the second inner chamber are spaced apart along the radial direction of the stator.

[0082] In some embodiments, the first spray ring extends axially along the stator so that the first outer chamber and the first inner chamber are distributed radially spaced along the stator; the second spray ring extends radially along the stator so that the second outer chamber and the second inner chamber are distributed axially spaced along the stator.

[0083] In some embodiments, the stator cooling structure further includes a second sealing ring disposed between the cooling assembly and the housing, so as to seal the cooling assembly and the housing.

[0084] In some embodiments, the stator cooling structure further includes a seal, which, together with the housing and the stator, forms the first cooling chamber and the second cooling chamber.

[0085] In some embodiments, the seal includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being radially spaced apart along the stator and located outside the second sealing ring; the first sealing ring, together with the housing and the stator, forms a first cooling chamber, and the second sealing ring, together with the housing and the stator, forms a second cooling chamber.

[0086] In some embodiments, the seal further includes a sealing portion disposed between the first sealing ring and the second sealing ring, and connected to both the first sealing ring and the second sealing ring respectively.

[0087] In some embodiments, the stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, the mounting groove being used to mount the stator winding; the sealing portion is at least one sealing strip, the sealing strip being adapted to be sealed to the mounting groove.

[0088] In some embodiments, the at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core; the at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the seal, and one of the sealing strips is embedded in one of the mounting slots.

[0089] In some embodiments, the first sealing ring, the second sealing ring, and the sealing strip together form an integrally molded structure.

[0090] In some embodiments, the seal and the cooling assembly are integrally formed.

[0091] In some embodiments, the stator cooling structure further includes a first sealing ring disposed between the seal and the housing to provide a sealed connection between the seal and the housing.

[0092] In some embodiments, the housing includes: an end plate, a first side plate, and a second side plate; the end plate is disposed at one end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; the end plate, the first side plate, the seal, and the stator enclose to form a first cooling chamber, and the end plate, the second side plate, the seal, and the stator enclose to form a second cooling chamber.

[0093] In some embodiments, the cooling medium channel includes an inlet channel and an outlet channel, the inlet channel being connected to the first outer chamber and the second outer chamber respectively, and the outlet channel being connected to the first inner chamber and the second inner chamber respectively.

[0094] In some embodiments, the inlet channel and the outlet channel satisfy at least one of the following: the inlet channel is disposed in at least one of the end plate and the first side plate; and the outlet channel is disposed in at least one of the end plate and the first side plate.

[0095] In some embodiments, the liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port and a second connecting port; the liquid inlet is configured to communicate with an external cooling device; the first connecting port and the second connecting port are arranged radially spaced along the stator, the first connecting port communicates with the first outer chamber, and the second connecting port communicates with the second outer chamber.

[0096] In some embodiments, the liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel; the first liquid inlet channel is connected to the first outer chamber; and the second liquid inlet channel is connected to the second outer chamber.

[0097] In some embodiments, the first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

[0098] In some embodiments, the liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port; the liquid outlet is configured to communicate with an external cooling device; the third connecting port and the fourth connecting port are arranged radially spaced along the stator, the third connecting port communicates with the first inner chamber, and the fourth connecting port communicates with the second inner chamber.

[0099] In some embodiments, the inlet channel and the outlet channel satisfy at least one of the following: the inlet channel is an inlet hole, and the outlet channel is an outlet hole.

[0100] In some embodiments of this disclosure, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling chamber is connected to the cooling medium channel, when the cooling medium channel is connected to an external cooling device, the cooling medium in the cooling chamber can be circulated, thereby continuously cooling the stator, which is beneficial to further improving the cooling effect of the stator.

[0101] Fourthly, a stator cooling structure is provided, the stator cooling structure including a housing for accommodating a stator, the housing and the stator enclosing each other to form a cooling chamber, the housing being provided with a first cooling medium channel, the stator being provided with a second cooling medium channel, the first cooling medium channel communicating with the cooling chamber through the second cooling medium channel.

[0102] In some embodiments, the second cooling medium channel is disposed in the stator core of the stator, and the cooling medium in the second cooling medium channel is used to cool one axial side of the stator core.

[0103] In some embodiments, the second cooling medium channel includes at least one first sub-cooling medium channel extending radially along the stator, and the first sub-cooling medium channel communicating with the first cooling medium channel and the cooling chamber.

[0104] In some embodiments, the at least one first sub-cooling medium channel includes a plurality of first sub-cooling medium channels, which are arranged at circumferential intervals along the stator.

[0105] In some embodiments, the second cooling medium channel further includes at least one second sub-cooling medium channel, the second sub-cooling medium channel extending circumferentially along the stator and communicating with the first sub-cooling medium channel and the first cooling medium channel, so that the cooling medium in the first cooling medium channel can enter the first sub-cooling medium channel through the second sub-cooling medium channel.

[0106] In some embodiments, the at least one second sub-cooling medium channel includes a plurality of second sub-cooling medium channels, which are arranged at radial intervals along the stator.

[0107] In some embodiments, the first sub-cooling medium channel and the second sub-cooling medium channel are respectively disposed in the stator core of the stator.

[0108] In some embodiments, the cooling chamber includes a first cooling chamber and a second cooling chamber, the first cooling chamber and the second cooling chamber being respectively connected to the first sub-cooling medium channel; the first cooling chamber and the second cooling chamber are spaced apart along the radial direction of the stator, and the first cooling chamber is located outside the second cooling chamber; the first cooling chamber is configured to cool the radially outer side of the stator, and the second cooling chamber is configured to cool the radially inner side of the stator.

[0109] In some embodiments, the stator cooling structure further includes a cooling assembly disposed in at least one of the first cooling chamber and the second cooling chamber, the cooling assembly being able to communicate the first cooling medium channel with the second cooling medium channel.

[0110] In some embodiments, the cooling assembly includes a first cooling element and a second cooling element, which are spaced apart along the radial direction of the stator; the first cooling element is disposed within a first cooling chamber to divide the first cooling chamber into a first sub-cooling chamber and a second sub-cooling chamber, and a cooling medium can enter the second sub-cooling chamber from the first sub-cooling chamber; the second cooling element is disposed within the second cooling chamber to divide the second cooling chamber into a third sub-cooling chamber and a fourth sub-cooling chamber, and the cooling medium can enter the fourth sub-cooling chamber from the third sub-cooling chamber; the first sub-cooling chamber and the third sub-cooling chamber are respectively connected to the first sub-cooling medium channel.

[0111] In some embodiments, at least a portion of the stator winding protrudes radially outward from the stator core to form a first end winding, and at least a portion of the stator winding protrudes radially inward from the stator core to form a second end winding; a second sub-cooling chamber is configured to receive the first end winding so that the cooling medium contacts the first end winding for heat exchange, and a third sub-cooling chamber is configured to receive the second end winding so that the cooling medium contacts the second end winding for heat exchange.

[0112] In some embodiments, the pressure of the cooling medium in the first sub-cooling chamber is greater than the pressure of the cooling medium in the second sub-cooling chamber; the pressure of the cooling medium in the third sub-cooling chamber is greater than the pressure of the cooling medium in the fourth sub-cooling chamber.

[0113] In some embodiments, the first cooling element includes a first spray ring having at least one first spray hole configured to spray cooling medium from the first sub-cooling chamber into the second sub-cooling chamber.

[0114] In some embodiments, the at least one first spray hole includes a plurality of first spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the first spray ring.

[0115] In some embodiments, the second cooling element includes a second spray ring having at least one second spray hole configured to spray the cooling medium from the third sub-cooling chamber into the fourth sub-cooling chamber.

[0116] In some embodiments, the at least one second spray hole includes a plurality of second spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the second spray ring.

[0117] In some embodiments, the first spray ring extends radially along the stator so that the first sub-cooling chamber and the second sub-cooling chamber are spaced apart along the axial direction of the stator; the second spray ring extends radially along the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are spaced apart along the axial direction of the stator.

[0118] In some embodiments, the first spray ring extends radially along the stator so that the first sub-cooling chamber and the second sub-cooling chamber are spaced apart along the axial direction of the stator; the second spray ring extends axially along the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are spaced apart along the radial direction of the stator.

[0119] In some embodiments, the first spray ring extends axially along the stator so that the first sub-cooling chamber and the second sub-cooling chamber are distributed radially spaced along the stator; the second spray ring extends radially along the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are distributed axially spaced along the stator.

[0120] In some embodiments, the first spray ring extends axially along the stator so that the first sub-cooling chamber and the second sub-cooling chamber are radially spaced along the stator; the second spray ring extends axially along the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are radially spaced along the stator.

[0121] In some embodiments, the stator cooling structure further includes a second sealing ring disposed between the cooling assembly and the housing, so as to seal the cooling assembly and the housing.

[0122] In some embodiments, the stator cooling structure further includes a seal, which, together with the housing and the stator, forms the first cooling chamber and the second cooling chamber.

[0123] In some embodiments, the seal includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being radially spaced along the stator and located outside the second sealing ring; the first sealing ring, together with the housing and the stator, forms a first cooling chamber; the second sealing ring, together with the housing and the stator, forms a second cooling chamber.

[0124] In some embodiments, the seal further includes a sealing portion disposed between the first sealing ring and the second sealing ring, and connected to the first sealing ring and the second sealing ring respectively.

[0125] In some embodiments, the stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, the mounting groove being configured to mount the stator winding; the sealing portion is at least one sealing strip adapted to be sealingly connected with the mounting groove.

[0126] In some embodiments, the at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core; the at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the seal, and one of the sealing strips is embedded in one of the mounting slots.

[0127] In some embodiments, the first sealing ring, the second sealing ring, and the sealing strip together form an integrally molded structure.

[0128] In some embodiments, the seal and the cooling assembly are integrally formed.

[0129] In some embodiments, the stator cooling structure further includes a first sealing ring disposed between the seal and the housing to provide a sealed connection between the seal and the housing.

[0130] In some embodiments, the housing includes an end plate, a first side plate, and a second side plate; the end plate is disposed at one end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; the end plate, the first side plate, the seal, and the stator enclose to form a first cooling chamber, and the end plate, the second side plate, the seal, and the stator enclose to form a second cooling chamber.

[0131] In some embodiments, the first cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel. The cooling medium inlet channel is connected to the first sub-cooling chamber and the third sub-cooling chamber respectively through the second cooling medium channel. The cooling medium outlet channel is connected to the second sub-cooling chamber and the fourth sub-cooling chamber respectively.

[0132] In some embodiments, the cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: the cooling medium inlet channel is disposed in at least one of the end plate and the first side plate; and the cooling medium outlet channel is disposed in at least one of the end plate and the first side plate.

[0133] In some embodiments, the cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes an inlet and a first outlet; the inlet is configured to communicate with an external cooling device; and the first outlet is communicated with the second cooling medium channel.

[0134] In some embodiments, the cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes a second liquid outlet, a third connecting port and a fourth connecting port. The second liquid outlet is configured to communicate with an external cooling device. The third connecting port and the fourth connecting port are arranged radially spaced along the stator. The third connecting port communicates with the second sub-cooling chamber, and the fourth connecting port communicates with the fourth sub-cooling chamber.

[0135] In some embodiments, the cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: the cooling medium inlet channel is a liquid inlet hole, and the cooling medium outlet channel is a liquid outlet hole.

[0136] Fifthly, a stator cooling structure is provided for a stator, the stator including the stator cooling structures described in the first to fourth aspects.

[0137] In some embodiments, the stator includes a stator core and a stator winding, the stator winding being wound around the stator core and extending at least partially outward from the radial side of the stator core to form a first end winding, and extending at least partially outward from the radial side of the stator core to form a second end winding; the cooling chamber is configured to cool at least one of the first end winding and the second end winding.

[0138] In some embodiments, the housing includes a first side plate surrounding the stator core, the side plate having a mounting cavity on the side opposite to the stator core; the stator further includes a junction box disposed within the mounting cavity, the junction box being configured to be electrically connected to the stator winding.

[0139] In a sixth aspect, an electric motor is provided, the electric motor including a rotating shaft, a rotor, and a stator as described in the fifth aspect; the rotor and the stator are spaced apart axially from each other on the rotating shaft; the rotating shaft passes through the rotor and the stator, the rotating shaft is connected to the rotor and rotatably connected to the stator, so that the rotating shaft can rotate relative to the stator.

[0140] In some embodiments, the motor has two stators, which are disposed on opposite axial sides of the rotor.

[0141] In a seventh aspect, an electric motor is provided for use in a powertrain.

[0142] Eighthly, a vehicle is provided, the vehicle comprising the electric motor described in the sixth aspect, or the powertrain described in the seventh aspect.

[0143] This disclosure provides embodiments of a stator cooling structure, a stator, a motor, a powertrain, and a vehicle. The stator cooling structure includes a housing configured to accommodate the stator. The housing and the stator enclose a cooling chamber. The housing has a first cooling medium channel, and the stator has a second cooling medium channel. The first cooling medium channel communicates with the cooling chamber through the second cooling medium channel.

[0144] The stator cooling structure disclosed in some embodiments of this disclosure forms a cooling chamber by enclosing a housing and a stator. The housing is provided with a first cooling medium channel, and the stator is provided with a second cooling medium channel. The first cooling medium channel communicates with the cooling chamber through the second cooling medium channel. The cooling medium enters the second cooling medium channel from the first cooling medium channel to cool the stator, and then enters the cooling chamber from the second cooling medium channel to cool the stator, thereby improving the cooling efficiency of the stator and improving the performance of the motor. Attached Figure Description

[0145] To more clearly illustrate the technical solutions in some embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0146] Figure 1 is a structural diagram of the housing according to some embodiments;

[0147] Figure 2 is a structural diagram of the exploded view of the housing according to some embodiments;

[0148] Figure 3 is a structural diagram of a stator according to some embodiments;

[0149] Figure 4 is a structural diagram of a stator core according to some embodiments;

[0150] Figure 5 is a structural diagram of a stator winding according to some embodiments;

[0151] Figure 6 is a partial exploded view of a motor according to some embodiments;

[0152] Figure 7 is a structural diagram of the seal and cooling assembly of the stator cooling structure according to some embodiments;

[0153] Figure 8 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of a stator cooling structure according to some embodiments;

[0154] Figure 9 is a partial cross-sectional view of a motor according to some embodiments;

[0155] Figure 10 is a partial cross-sectional view of a motor according to some embodiments;

[0156] Figure 11 is a partial exploded view of a motor according to some embodiments, structural diagram two;

[0157] Figure 12 is a structural diagram of the seal and cooling assembly of the stator cooling structure according to some embodiments;

[0158] Figure 13 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of the stator cooling structure according to some embodiments;

[0159] Figure 14 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of the stator cooling structure according to some embodiments;

[0160] Figure 15 is a partial cross-sectional view of a motor according to some embodiments;

[0161] Figure 16 is a partial cross-sectional view of a motor according to some embodiments;

[0162] Figure 17 is one of the structural diagrams of an electric motor according to some embodiments;

[0163] Figure 18 is a second structural diagram of an electric motor according to some embodiments;

[0164] Figure 19 is a third structural diagram of an electric motor according to some embodiments;

[0165] Figure 20 is a partial structural diagram of an electric motor according to some embodiments;

[0166] Figure 21 is one of the structural diagrams of the housing according to some embodiments;

[0167] Figure 22 is a second structural diagram of the housing according to some embodiments;

[0168] Figure 23 is a structural diagram of the stator according to some embodiments;

[0169] Figure 24 is a structural diagram of a stator core according to some embodiments;

[0170] Figure 25 is a structural diagram of a stator winding according to some embodiments;

[0171] Figure 26 is a structural diagram of the seal and cooling assembly of the stator cooling structure according to some embodiments;

[0172] Figure 27 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of a stator cooling structure according to some embodiments;

[0173] Figure 28 is a schematic diagram of the liquid outlet fluid domain of a stator cooling structure according to some embodiments;

[0174] Figure 29 is one of the structural diagrams of an electric motor according to some embodiments;

[0175] Figure 30 is a second structural diagram of an electric motor according to some embodiments;

[0176] Figure 31 is a third structural diagram of an electric motor according to some embodiments;

[0177] Figure 32 is a partial structural diagram of an electric motor according to some embodiments;

[0178] Figure 33 is a structural diagram of another motor according to some embodiments;

[0179] Figure 34 is a partial structural diagram of another motor according to some embodiments;

[0180] Figure 35 is one of the structural diagrams of the housing according to some embodiments;

[0181] Figure 36 is a second structural diagram of the housing according to some embodiments;

[0182] Figure 37 is a structural diagram of a stator according to some embodiments;

[0183] Figure 38 is a structural diagram of a stator core according to some embodiments;

[0184] Figure 39 is a structural diagram of a stator winding according to some embodiments;

[0185] Figure 40 is a structural diagram of the seal and cooling assembly of the stator cooling structure according to some embodiments;

[0186] Figure 41 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of a stator cooling structure according to some embodiments;

[0187] Figure 42 is an exploded view of the motor according to some embodiments;

[0188] Figure 43 is a structural diagram of the housing according to some embodiments;

[0189] Figure 44 is a structural diagram of the housing according to some embodiments;

[0190] Figure 45 is a cross-sectional view of the motor according to some embodiments;

[0191] Figure 46 is a second cross-sectional view of the motor according to some embodiments;

[0192] Figure 47 is a structural diagram of the stator according to some embodiments;

[0193] Figure 48 is a structural diagram of the stator according to some embodiments;

[0194] Figure 49 is a structural diagram of the stator core according to some embodiments;

[0195] Figure 50 is a structural diagram of the stator core according to some embodiments;

[0196] Figure 51 is a structural diagram of the stator winding according to some embodiments;

[0197] Figure 52 is a structural diagram of the seal according to some embodiments;

[0198] Figure 53 is a structural diagram of the seal and the cooling assembly according to some embodiments. Detailed Implementation

[0199] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0200] In related technologies, a cooling structure is installed on an axial flux motor, and heat-conducting components transfer heat from the stator to the cooling structure for cooling. However, the cooling medium in this type of cooling structure often has difficulty making sufficient contact with the stator for heat exchange, resulting in poor stator cooling performance.

[0201] To address the aforementioned issues, as shown in Figures 1 to 16, some embodiments of this disclosure provide a stator cooling structure. The stator cooling structure includes a housing 1 and a cooling assembly 3. The housing 1 is used to accommodate a stator 2, and the housing 1 and the stator 2 enclose a cooling chamber 4. The housing 1 is provided with a cooling medium channel. The cooling medium channel is connected to the cooling chamber 4 through the cooling assembly 3.

[0202] When the stator cooling structure is in use, the cooling medium channel is used to connect with the external cooling device, and the cooling medium enters the cooling chamber 4 in sequence through the cooling medium channel and the cooling component 3.

[0203] In some embodiments of this disclosure, the housing 1 and the stator 2 enclose a cooling chamber 4, with the stator 2 directly contacting the cooling medium within the cooling chamber 4. Therefore, in the stator cooling structure of some embodiments of this disclosure, the stator 2 directly contacts the cooling medium for heat exchange, and the heat from the stator 2 is carried away to the outside of the motor through the circulation of the cooling medium, thereby achieving cooling of the stator 2. Compared to structures that indirectly cool the stator 2, this structure, where the stator 2 directly contacts the cooling medium for heat exchange, can significantly improve the cooling effect on the stator 2.

[0204] Understandably, when the cooling effect of stator 2 is improved, on the one hand, the overall temperature of the motor decreases, which can increase the permanent magnet flux linkage and output torque of the motor, thereby increasing the torque density and efficiency of the motor. On the other hand, the current flowing through stator 2 (the current flowing through the stator winding 22 of stator 2) can be appropriately increased, i.e., the electrical load is increased, which can increase the output torque and power, further improving the torque density and power density of the motor. In addition, compared with the structure of indirect cooling of stator 2, the stator cooling structure of some embodiments of this disclosure adopts direct cooling, that is, stator 2 is in direct contact with the cooling medium. While improving the cooling effect, it can also save space. Under the condition of meeting the same torque and power, the size and weight of the motor using the stator cooling structure of some embodiments of this disclosure can be designed to be smaller, which is beneficial to the space layout of the motor and the whole vehicle, and also beneficial to the lightweighting of the vehicle.

[0205] The cooling medium in some embodiments of this disclosure includes cooling oil, which serves both to cool the stator 2 and to lubricate it. It is understood that the above are merely examples of cooling media and are not intended to limit the range of cooling media. In practical applications, those skilled in the art can select the appropriate cooling medium as needed.

[0206] In some embodiments, the cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42. Along the radial direction of the stator 2, the first cooling chamber 41 is located outside the second cooling chamber 42. The first cooling chamber 41 is used to cool the radially outer side of the stator 2, and the second cooling chamber 42 is used to cool the radially inner side of the stator 2.

[0207] In some embodiments of this disclosure, the cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42. After a cooling medium is introduced into the cooling chamber 4, the cooling medium in the first cooling chamber 41 can cool the radial outer side of the stator 2, and the cooling medium in the second cooling chamber 42 can cool the radial inner side of the stator 2. The first cooling chamber 41 and the second cooling chamber 42 can increase the contact heat exchange area between the cooling medium and the stator 2, which is beneficial to improving the cooling effect of the stator 2.

[0208] In some embodiments, the cooling assembly 3 includes a first cooling assembly 3 and a second cooling assembly 3, which are arranged radially apart along the stator 2; the first cooling assembly 3 is disposed in the first cooling chamber 41 and connects the cooling medium channel and the first cooling chamber 41; the second cooling assembly 3 is disposed in the second cooling chamber 42 and connects the cooling medium channel and the second cooling chamber 42.

[0209] In some embodiments of this disclosure, after the cooling medium delivered by the cooling device enters the cooling medium channel, it enters the first cooling chamber 41 through the first cooling assembly 3 and the second cooling chamber 42 through the second cooling assembly 3. The stator cooling structure delivers the cooling medium to the first cooling chamber 41 and the second cooling chamber 42 respectively through the first cooling assembly 3 and the second cooling assembly 3, cooling the radially outer and radially inner sides of the stator 2 respectively, which helps to further improve the cooling effect of the stator 2.

[0210] In some embodiments, the first cooling assembly 3 includes a first spray pipe 26, which is arranged around the axis of the stator 2, and the first spray pipe 26 is provided with a first spray port 261 that communicates with the first cooling chamber 41.

[0211] Referring to Figure 12, the first spray pipe 26 is an annular pipe arranged around the axis of the stator 2. The first spray pipe 26 is connected to the cooling medium channel. The cooling medium supplied by the cooling device enters the cooling medium channel and then enters the first spray pipe 26, and is sprayed out into the first cooling chamber 41 through the first spray nozzle 261. The cooling medium entering the first cooling chamber 41 contacts and exchanges heat with the radial outer side of the stator 2.

[0212] In some embodiments, at least two first spray pipes 26 are provided, and the at least two first spray pipes 26 are spaced apart along the axial direction of the stator 2. In this case, more cooling medium can be sprayed into the first cooling chamber 41, effectively improving the cooling effect on the stator 2.

[0213] In some embodiments, multiple first spray nozzles 261 are provided, and the multiple first spray nozzles 261 are arranged at intervals along the circumference of the first spray pipe 26, so that the cooling medium of the first spray pipe 26 can be uniformly sprayed into the first cooling chamber 41 from multiple directions. On the one hand, it can increase the contact area between the cooling medium and the stator 2, thereby further improving the cooling effect of the stator 2. On the other hand, it can ensure that all parts of the radially outer side of the stator 2 are effectively cooled, which is beneficial to improving the cooling uniformity of the stator 2.

[0214] It should be noted that some embodiments of this disclosure do not limit the number, size, or spacing of the first spray nozzles 261, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the first spray nozzles 261 have sufficient structural strength, increasing the number of first spray nozzles 261 can improve the spray uniformity of the first spray pipe 26 to a certain extent. Therefore, in some embodiments, if multiple first spray nozzles 261 located on the same circumference are defined as a row of first spray nozzles 261, those skilled in the art can increase the number of first spray nozzles 261 by setting multiple rows of first spray nozzles 261 to improve the spray uniformity of the first spray pipe 26, thereby further improving the cooling uniformity of the stator 2.

[0215] In some embodiments, the second cooling assembly 3 includes a second spray pipe 25, which is arranged around the axis of the stator 2, and the second spray pipe 25 is provided with a second spray port 225 communicating with the second cooling chamber 42.

[0216] Referring to Figure 12, the second spray pipe 25 is an annular pipe arranged around the axis of the stator 2. The second spray pipe 25 is connected to the cooling medium channel. The cooling medium supplied by the cooling device enters the cooling medium channel and then enters the second spray pipe 25, and is sprayed out into the second cooling chamber 42 through the second spray nozzle 225. The cooling medium entering the second cooling chamber 42 contacts and exchanges heat with the radial inner side of the stator 2.

[0217] In some embodiments, at least two second spray pipes 25 are provided, and the at least two second spray pipes 25 are spaced apart along the axial direction of the stator 2. In this case, more cooling medium can be sprayed into the second cooling chamber 42, effectively improving the cooling effect on the stator 2.

[0218] In some embodiments, multiple second spray nozzles 225 are provided, and the multiple second spray nozzles 225 are arranged at intervals along the circumference of the second spray pipe 25, so that the cooling medium of the second spray pipe 25 can be uniformly sprayed into the second cooling chamber 42 from multiple directions. On the one hand, it can increase the contact area between the cooling medium and the stator 2, thereby further improving the cooling effect of the stator 2. On the other hand, it can ensure that all parts of the radially outer side of the stator 2 are effectively cooled, which is beneficial to improving the cooling uniformity of the stator 2.

[0219] It should be noted that some embodiments of this disclosure do not limit the number, size, or spacing of the second spray nozzles 225, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the second spray nozzles 225 have sufficient structural strength, increasing the number of second spray nozzles 225 can improve the spray uniformity of the second spray pipe 25 to a certain extent. Therefore, in some embodiments, if multiple second spray nozzles 225 located on the same circumference are defined as a row of second spray nozzles 225, those skilled in the art can increase the number of second spray nozzles 225 by setting multiple rows of second spray nozzles 225 to improve the spray uniformity of the second spray pipe 25, thereby further improving the cooling uniformity of the stator 2.

[0220] In some embodiments, the first cooling assembly 3 includes a first guide ring 23, which divides the first cooling chamber 41 into a first outer chamber 411 and a first inner chamber 412. The first outer chamber 411 is connected to a cooling medium channel, and the first inner chamber 412 is used to cool the radially outer side of the stator 2. The first guide ring 23 is provided with a plurality of first guide holes 231, which connect the first outer chamber 411 and the first inner chamber 412.

[0221] Referring to Figures 7 and 10, the first outer chamber 411 is connected to the cooling medium channel. The cooling medium delivered by the cooling device enters the cooling medium channel and then enters the first outer chamber 411. It is then sprayed out into the first inner chamber 412 through the first guide hole 231. The cooling medium entering the first inner chamber 412 contacts and exchanges heat with the radial outer side of the stator 2.

[0222] In some embodiments, the first guide ring 23 extends along the axial direction of the stator 2 so that the first outer chamber 411 and the first inner chamber 412 are distributed radially spaced along the stator 2, with the first outer chamber 411 located outside the first inner chamber 412 in the radial direction of the stator 2; or, the first guide ring 23 extends radially along the stator 2 so that the first outer chamber 411 and the first inner chamber 412 are distributed radially spaced along the axial direction of the stator.

[0223] The first guide ring 23 extends radially along the stator 2 so that the first outer chamber 411 and the first inner chamber 412 are spaced apart along the axial direction of the stator. This allows the housing 1 to be positioned as close as possible to the stator 2, thereby reducing the radial dimension of the motor and facilitating its miniaturization.

[0224] In some embodiments, the stator cooling structure satisfies at least one of the following: a plurality of first guide holes 231 are spaced apart circumferentially along the first guide ring 23; a plurality of first guide holes 231 are spaced apart axially along the first guide ring 23; and a plurality of first guide holes 231 are spaced apart radially along the first guide ring 23.

[0225] In some embodiments of this disclosure, by arranging a plurality of first guide holes 231 at circumferential intervals along the first guide ring 23, the cooling medium in the first outer chamber 411 can be uniformly sprayed into the first inner chamber 412 from multiple directions. On the one hand, this increases the contact area between the cooling medium and the stator 2, thereby further improving the cooling effect of the stator 2. On the other hand, it allows all parts of the radially outer side of the stator 2 to receive effective cooling, which is beneficial to improving the cooling uniformity of the stator 2.

[0226] It should be noted that some embodiments of this disclosure do not limit the number, size, or spacing of the first guide holes 231, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the first guide ring 23 has sufficient structural strength, increasing the number of first guide holes 231 can improve the uniformity of liquid spraying of the first guide ring 23 to a certain extent. Therefore, in some embodiments, if multiple first guide holes 231 located on the same circumference are defined as a row of first guide holes 231, those skilled in the art can increase the number of first guide holes 231 by setting multiple rows of first guide holes 231. That is, multiple first guide holes 231 are spaced apart axially along the first guide ring 23, and multiple first guide holes 231 are spaced apart radially along the first guide ring 23, to improve the uniformity of liquid spraying of the first guide ring 23, thereby further improving the cooling uniformity of the stator 2.

[0227] In some embodiments of this disclosure, when the stator cooling structure is used, the pressure of the cooling medium in the first outer chamber 411 is greater than the pressure of the cooling medium in the first inner chamber 412. That is, there is a pressure difference between the first outer chamber 411 and the first inner chamber 412, which allows the cooling medium to be sprayed into the first inner chamber 412 at a higher spray pressure. On the one hand, the higher spray pressure can make the sprayed cooling medium finer, thereby further increasing the contact area between the cooling medium and the stator winding 22. On the other hand, for the stator winding 22, which is composed of multiple wires in the stator 2, the higher spray pressure can allow the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling of the stator winding 22.

[0228] It should be noted that some embodiments of this disclosure do not limit the cooling medium pressure of the first outer chamber 411 and the first inner chamber 412. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0229] In some embodiments, the second cooling assembly 3 includes a second guide ring (it should be noted that this arrangement is not shown in the figures of some embodiments of this disclosure, and can be adjusted with reference to the first guide ring 23 in Figures 7 to 10). The second guide ring divides the second cooling chamber 42 into a second outer chamber and a second inner chamber. The second outer chamber is connected to the cooling medium channel, and the second inner chamber is used to cool the radially inner side of the stator 2. The second guide ring is provided with a plurality of second guide holes, which are connected to the second outer chamber and the second inner chamber.

[0230] The second outer chamber is connected to the cooling medium channel. The cooling medium delivered by the cooling device enters the cooling medium channel and then enters the second outer chamber. It is then sprayed out into the second inner chamber through the second guide hole. The cooling medium entering the second inner chamber contacts and exchanges heat with the radial inner side of the stator 2.

[0231] In some embodiments, the second guide ring extends along the axial direction of the stator 2 so that the second outer chamber and the second inner chamber are distributed radially spaced apart along the stator 2, with the second outer chamber located outside the second inner chamber in the radial direction of the stator 2.

[0232] In some embodiments, the second guide ring extends radially along the stator 2, such that the second outer chamber and the second inner chamber are spaced apart axially along the stator 2. This allows the housing 1 to be positioned as close as possible to the stator 2, thereby reducing the radial dimension of the motor and facilitating motor miniaturization.

[0233] In some embodiments, the stator cooling structure satisfies at least one of the following: a plurality of second guide holes are spaced apart circumferentially along the second guide ring; a plurality of second guide holes are spaced apart axially along the second guide ring; and a plurality of second guide holes are spaced apart radially along the second guide ring.

[0234] In some embodiments of this disclosure, by arranging a plurality of second guide holes at circumferential intervals along the second guide ring, the cooling medium of the second outer chamber can be uniformly sprayed into the second inner chamber from multiple directions. On the one hand, this increases the contact area between the cooling medium and the stator 2, thereby further improving the cooling effect of the stator 2. On the other hand, it ensures that all parts of the radially inner side of the stator 2 receive effective cooling, which is beneficial to improving the cooling uniformity of the stator 2.

[0235] It should be noted that this disclosure does not limit the number, size, or spacing of the second guide holes, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the second guide ring has sufficient structural strength, increasing the number of second guide holes can improve the uniformity of liquid spraying on the second guide ring to a certain extent. Therefore, in some embodiments, if multiple second guide holes located on the same circumference are defined as a row of second guide holes, those skilled in the art can increase the number of second guide holes by setting multiple rows of second guide holes, that is, by arranging multiple second guide holes at axial intervals along the second guide ring, or by arranging multiple second guide holes at radial intervals along the second guide ring, to improve the uniformity of liquid spraying on the second guide ring, thereby further improving the cooling uniformity of the stator 2.

[0236] In some embodiments of this disclosure, when the stator cooling structure is used, the pressure of the cooling medium in the second outer cavity is greater than the pressure of the cooling medium in the second inner cavity. That is, a pressure difference exists between the second outer cavity and the second inner cavity, allowing the cooling medium to be sprayed into the second inner cavity at a higher injection pressure. On the one hand, the higher injection pressure allows the sprayed cooling medium to be finer, thereby further increasing the contact area between the cooling medium and the stator winding 22. On the other hand, for the stator winding 22, which consists of multiple wires in the stator 2, the higher injection pressure allows the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling of the stator winding 22.

[0237] It should be noted that this disclosure does not limit the cooling medium pressure of the second outer chamber and the second inner chamber, and those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0238] In some embodiments of this disclosure, the first cooling assembly 3 may include a first spray pipe 26 or a first guide ring 23, and the second cooling assembly 3 may include a second spray pipe 25 or a second guide ring. The cooling assembly 3 may have various combinations. For example, the cooling assembly may include both the first spray pipe 26 and the second spray pipe 25; or, the cooling assembly may include both the first spray pipe 26 and the second guide ring; or, the cooling assembly may include both the first guide ring 23 and the second spray pipe 25; or, the cooling assembly may include both the first guide ring 23 and the second guide ring. The cooling assembly can be flexibly configured according to usage requirements.

[0239] When the first cooling assembly 3 includes the first liquid spray pipe 26, compared to the first cooling assembly 3 including the first guide ring 23, it can provide sufficient wiring space and assembly space for the stator winding 22 in the stator 2, which is convenient for mass production.

[0240] In some embodiments, the motor further includes a rotor 6 disposed within the housing 1, and the rotor 6 and the stator 2 are spaced apart axially in the stator 2 to form an air gap. To prevent the cooling medium from leaking into the air gap and causing a decrease in motor performance, the stator cooling structure further includes a seal 5 disposed within the housing 1, and the seal 5, the housing 1, and the stator 2 enclose a first cooling chamber 41 and a second cooling chamber 42.

[0241] In some embodiments of this disclosure, since a sealing element 5 is provided, and the sealing element 5, together with the housing 1 and the stator 2, forms a first cooling chamber 41 and a second cooling chamber 42, the sealing performance of the first cooling chamber 41 and the second cooling chamber 42 can be improved, effectively preventing the cooling medium from leaking into the air gap between the stator 2 and the rotor 6, which is beneficial to improving the working performance of the motor.

[0242] In some embodiments, the seal 5 includes a first sealing portion 17 and a second sealing portion 18 connected to each other. The first sealing portion 17, the housing 1 and the stator 2 enclose a first cooling chamber 41, and the first sealing portion 17, the second sealing portion 18, the housing 1 and the stator 2 enclose a second cooling chamber 42.

[0243] In some embodiments, the first sealing portion 17 is an annular structure extending radially along the stator 2, with its outer end connected to the housing 1 and its inner end connected to the second sealing portion 18. In some embodiments of this disclosure, the outer end of the first sealing portion 17 extends out of the stator 2 radially to enclose and form a first cooling chamber 41, and the inner end of the first sealing portion 17 also extends out of the stator 2 to enclose and form a second cooling chamber 42.

[0244] In some embodiments, the second sealing part 18 is a hollow cylindrical structure extending along the axial direction of the stator 2, and there is a gap between the second sealing part 18 and the radial inner side of the stator; along the axial direction of the stator 2, one end of the second sealing part 18 is connected to the inner end of the first sealing part 17, and the other end of the second sealing part 18 is connected to the housing 1.

[0245] In some embodiments of this disclosure, one end of the second sealing part 18 is connected to the inner end of the first sealing part 17, and the other end of the second sealing part 18 is connected to the housing 1. The first sealing part 17, the second sealing part 18, the housing 1, and the stator 2 enclose to form a second cooling chamber 42, which can prevent the cooling medium from leaking from the radial inner side of the stator 2 and prevent the leakage of the cooling medium from affecting the working performance of the motor.

[0246] In some embodiments, the stator 2 includes a stator core 21 and a stator winding 22 wound around the stator core 21. The stator winding 22 protrudes from the radially outer and radially inner sides of the stator core 21 to form a first end winding 46 and a second end winding 47. A first cooling chamber 41 is used to accommodate the first end winding 46 and to cool the first end winding 46. A second cooling chamber 42 is used to accommodate the second end winding 47 and to cool the second end winding 47.

[0247] In practical applications, the stator winding 22 includes a first end winding 46, a middle winding 48, and a second end winding 47, which are distributed sequentially from the outside to the inside along the radial direction of the stator 2. The middle winding 48 is connected to the stator core 21 to achieve the connection between the stator winding 22 and the stator core 21. The first end winding 46 protrudes radially outward from the stator 2, and the second end winding 47 protrudes radially inward from the stator 2. By providing the first cooling chamber 41 and the second cooling chamber 42 respectively, the inner and outer sides of the stator winding 22 can be cooled respectively, that is, the first end winding 46 and the second end winding 47 can be cooled, as well as the radially outer and radially inner sides of the stator 2, which is beneficial to further improve the cooling effect of the stator 2.

[0248] In some embodiments, a mounting groove 212 extending radially along the stator core 21 is provided on the side of the stator core 21 near the first sealing part 17. The mounting groove 212 is used to mount the stator winding 22. The first sealing part 17 includes a sealing strip adapted to be sealed to the mounting groove 212.

[0249] In some embodiments, the middle winding 48 of the stator winding 22 is embedded in the mounting groove 212 so that the stator winding 22 is reliably connected to the stator core 21.

[0250] In some embodiments of this disclosure, there are gaps between the multiple wires in the mounting groove 212, or between the wires and the edge of the mounting groove 212. This causes the cooling medium in the first cooling chamber 41 and the second cooling chamber 42 to flow into each other. By using a sealing strip to seal the connection with the mounting groove 212, the influence of the mutual flow of the cooling medium in the first cooling chamber 41 and the second cooling chamber 42 on the cooling effect can be avoided, and the flow of the cooling medium is more controllable.

[0251] In some embodiments, the seal 5 can be snapped onto one side of the stator 2, i.e., snapped onto the mounting groove 212. Alternatively, the seal 5 can also be detachably connected to one side of the stator 2 by bolts. This disclosure does not limit this, and those skilled in the art can configure it as needed.

[0252] In some embodiments, multiple mounting slots 212 are provided, and the multiple mounting slots 212 are spaced apart circumferentially along the stator core 21; multiple sealing strips are provided, and the multiple sealing strips are spaced apart circumferentially along the first sealing portion 17, and one sealing strip is embedded in one mounting slot 212.

[0253] It should be noted that some embodiments of this disclosure do not limit the number of mounting slots 212 and sealing strips, and those skilled in the art can adjust them according to actual needs. It is understood that the number of mounting slots 212 and sealing strips should be consistent. By sealing one sealing strip with one mounting slot 212, the entire end face of the stator core 21 can be sealed, effectively preventing leakage of the cooling medium.

[0254] In some embodiments, the first sealing portion 17 and the second sealing portion 18 are integrally formed. In this case, on the one hand, the overall structural strength of the seal 5 can be improved, which is beneficial to improving the service life of the seal 5. On the other hand, since no additional assembly steps are required between the first sealing portion 17 and the second sealing portion 18, the assembly process of the motor can be simplified, the assembly requirements of the motor can be reduced, and the assembly efficiency of the motor can be improved. Moreover, the assembly of the seal 5 and the stator 2 is also simplified.

[0255] In some embodiments of this disclosure, along the radial direction of the stator 2, the sealing element 5 includes, from the outside to the inside, a first sub-sealing portion 121, a third sub-sealing portion 123, and a second sub-sealing portion 122, which are sequentially connected. The first sub-sealing portion 121, the housing 1, and the stator 2 enclose a first cooling chamber 41, the second sub-sealing portion 122, the second sealing portion 123, and the housing 1 and the stator 2 enclose a second cooling chamber 42, and the third sub-sealing portion 123 is a sealing strip.

[0256] In some embodiments, in order to further improve the sealing effect between the seal 5 and the housing 1, the stator cooling structure further includes a first sealing ring, which is disposed between the seal 5 and the housing 1 so that the seal 5 and the housing 1 are sealed together.

[0257] In some embodiments of this disclosure, two first sealing rings are provided. One first sealing ring is provided between the outer end of the first sealing part 17 and the housing 1, and the other first sealing ring is provided between the end of the second sealing part 18 away from the first sealing part 17 and the housing 1, thereby realizing the sealing connection between the sealing member 5 and the housing 1.

[0258] In some embodiments, the first cooling assembly 3 includes a first guide ring 23, which extends axially along the stator 2. One end of the first guide ring 23 is connected to the seal 5, and the other end is connected to the housing 1. The first guide ring 23 divides the first cooling chamber 41 into a first inner chamber 412 and a first outer chamber 411. The first inner chamber 412 and the first outer chamber 411 are distributed radially spaced along the stator 2. The first inner chamber 412 communicates with the cooling medium channel, and the first outer chamber 411 is used to cool the radially inner side of the stator 2. The first guide ring 23 is provided with a plurality of first guide holes 231, which communicate with the first inner chamber 412 and the first outer chamber 411.

[0259] In some embodiments of this disclosure, one end of the first guide ring 23 is connected to the seal 5, and the other end of the first guide ring 23 is connected to the housing 1, so as to divide the first cooling chamber 41 into a first inner chamber 412 and a first outer chamber 411.

[0260] In some embodiments, the first guide ring 23 and the seal 5 form an integrally molded structure. In the above-described structure of some embodiments of this disclosure, on the one hand, the overall structural strength of the first guide ring 23 and the seal 5 can be improved, which is beneficial to increasing the service life of the first guide ring 23 and the seal 5. On the other hand, since no additional assembly steps are required between the first guide ring 23 and the seal 5, the motor assembly process can be simplified, the motor assembly requirements can be reduced, and the motor assembly efficiency can be improved. Furthermore, the assembly of the first guide ring 23 and the seal 5 with the stator 2 is also simplified.

[0261] In some embodiments, in order to further improve the sealing effect of the stator cooling structure, the stator cooling structure further includes a second sealing ring, which is disposed between the first guide ring 23 and the housing 1 so that the first guide ring 23 and the housing 1 are sealed together.

[0262] In some embodiments, the second cooling assembly 3 includes a second guide ring extending axially along the stator 2, one end of which is connected to the seal 5, and the other end of which is connected to the housing 1. The second guide ring divides the second cooling chamber 42 into a second inner chamber and a second outer chamber, which are radially spaced along the stator 2. The second inner chamber communicates with the cooling medium channel, and the second outer chamber is used to cool the radially inner side of the stator 2. The second guide ring is provided with a plurality of second guide holes, which communicate with the second inner chamber and the second outer chamber.

[0263] In some embodiments of this disclosure, one end of the second guide ring is connected to the seal 5, and the other end of the second guide ring is connected to the housing 1, so as to divide the second cooling chamber 42 into a second inner chamber and a second outer chamber.

[0264] In some embodiments, the second guide ring and the seal 5 form an integrally molded structure. In the above-described structure of some embodiments of this disclosure, on the one hand, the overall structural strength of the second guide ring and the seal 5 can be improved, which is beneficial to increasing the service life of the second guide ring and the seal 5. On the other hand, since no additional assembly steps are required between the second guide ring and the seal 5, the motor assembly process can be simplified, the motor assembly requirements can be reduced, and the motor assembly efficiency can be improved. Furthermore, the assembly of the second guide ring and the seal 5 with the stator 2 is also simplified.

[0265] In some embodiments, in order to further improve the sealing effect of the stator cooling structure, the stator cooling structure further includes a second sealing ring, which is disposed between the second guide ring and the housing 1 so that the second guide ring and the housing 1 are sealed together.

[0266] In some embodiments, the housing 1 includes an end plate 11 and a side plate 402; the end plate 11 is disposed on the side of the stator 2 away from the seal 5; the side plate 402 extends axially along the stator 2, and one end of the side plate 402 is connected to the outer peripheral end of the end plate 11; the end plate 11, the side plate 402, the seal 5 and the outer radial side of the stator 2 enclose a first cooling chamber 41, and the end plate 11, the seal 5 and the inner radial side of the stator 2 enclose a second cooling chamber 42.

[0267] It is understandable that the side plate 402 can be integrated with the end plate 11 to form an integral structure, or can be connected by welding or other methods.

[0268] In some embodiments, the cooling medium channel includes a cooling medium inlet channel 30 and a cooling medium outlet channel 12; the cooling medium inlet channel 30 is connected to the first cooling chamber 41 and the second cooling chamber 42 respectively; the cooling medium outlet channel 12 is connected to the first cooling chamber 41 and the second cooling chamber 42 respectively.

[0269] In the above-described structure of some embodiments of this disclosure, the cooling medium enters the first cooling chamber 41 and the second cooling chamber 42 through the cooling medium inlet channel 30, and the cooling medium in the first cooling chamber 41 and the second cooling chamber 42 flows out of the stator cooling structure through the cooling medium outlet channel 12. In this way, the cooling medium can flow in the first cooling chamber 41 and the second cooling chamber 42 respectively to achieve circulating cooling and improve the cooling effect on the stator 2.

[0270] In some embodiments, a cooling medium is located in the cooling medium inlet channel 30 to form an inlet fluid domain 61. The cooling medium in the cooling medium inlet channel 30 is sprayed into the first cooling chamber 41 through the first cooling assembly and into the second cooling chamber 42 through the second cooling assembly to form a spray fluid domain 62. The radially outer and radially inner sides of the stator 2 are in contact with the spray fluid domain 62. The inlet fluid domain 61 and the spray fluid domain 62 can be seen with reference to Figures 8, 13, and 14.

[0271] In some embodiments, the cooling medium inlet channel 30 and the cooling medium outlet channel 12 satisfy at least one of the following: the cooling medium inlet channel 30 is disposed in at least one of the end plate 11 and the side plate 402; and the cooling medium outlet channel 12 is disposed in at least one of the end plate 11 and the side plate 402.

[0272] In some embodiments of this disclosure, the cooling medium inlet channel 30 and the cooling medium outlet channel 12 satisfy at least one of the following: by providing the cooling medium inlet channel 30 in at least one of the end plate 11 and the side plate 402, and providing the cooling medium outlet channel 12 in at least one of the end plate 11 and the side plate 402, the cooling medium inlet channel 30 can be directly integrated into the housing 1, which can avoid the inconvenience of pipeline connection, and can make the cooling medium inlet channel 30 and the cooling medium outlet channel 12 as close as possible to the cooling chamber 4, which is beneficial to improving the cooling effect.

[0273] In some embodiments of this disclosure, taking a cooling medium inlet channel 30 as an example, there are three configuration methods: the cooling medium inlet channel 30 is only configured on the end plate 11, the cooling medium inlet channel 30 is only configured on the side plate 402, and the cooling medium inlet channel 30 is configured on both the end plate 11 and the side plate 402. Those skilled in the art can choose according to actual needs.

[0274] Furthermore, this disclosure does not limit the number of cooling medium inlet channels 30 and cooling medium outlet channels 12, which can be adjusted by those skilled in the art according to actual needs. In one embodiment, the motor includes two housings 1 that are axially opposite to and connected to each other along the stator 2. For each housing 1, there may be only one cooling medium inlet channel 30 and one cooling medium outlet channel 12, or there may be multiple cooling medium inlet channels 30 and multiple cooling medium outlet channels 12. This is not limited here, and those skilled in the art can adjust it according to actual needs. "Multiple" refers to two or more values.

[0275] In some embodiments, a cooling medium inlet channel 30 is disposed on an end plate 11. The cooling medium inlet channel 30 includes: a liquid inlet 141, a first connecting port 142, and a second connecting port. The liquid inlet 141 is used to communicate with an external cooling device. The first connecting port 142 and the second connecting port are arranged radially apart along the stator 2. The first connecting port 142 communicates with the first cooling chamber 41, and the second connecting port communicates with the second cooling chamber 42.

[0276] In some embodiments of this disclosure, by connecting the liquid inlet 141 to an external circulating cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2 and improving the operational reliability of the motor. Furthermore, since a first connecting port 142 communicating with the first cooling chamber 41 and a second connecting port communicating with the second cooling chamber 42 are provided, the cooling medium from the cooling device can enter the cooling medium inlet channel 30 through the liquid inlet 141 and then be diverted to the first cooling chamber 41 and the second cooling chamber 42.

[0277] It should be noted that some embodiments of this disclosure do not limit the structure of the cooling medium inlet channel 30, and those skilled in the art can make adjustments according to actual needs. Taking the cooling medium inlet channel 30 disposed on the end plate 11 as an example, the cooling medium inlet channel 30 can be a channel formed inside the end plate 11, or it can be formed on the surface of the end plate 11 with part of the outer wall of the cooling medium inlet channel 30 protruding from the surface of the end plate 11.

[0278] In some embodiments, the cooling medium inlet channel 30 includes a plurality of sub-inlet channels, each sub-inlet channel having a straight segment structure, each sub-inlet channel intersecting and communicating with at least one other sub-inlet channel; one end of some sub-inlet channels is located at the outer peripheral end of the end plate 11 and is closed, and one end of the remaining sub-inlet channels is located at the outer peripheral end of the end plate 11 and forms a liquid inlet 141; at least one sub-inlet channel is provided with a first communication port, and at least one sub-inlet channel is provided with a second communication port.

[0279] In practical applications, a tool is usually used to punch a cooling medium inlet channel 30 on the end plate 11. The punched cooling medium inlet channel 30 is a straight segment structure. In order for the cooling medium inlet channel 30 to connect the first cooling chamber 41 and the second cooling chamber 42 at the same time, multiple holes need to be punched, that is, multiple sub-inlet channels are used to guide the cooling medium to the first cooling chamber 41 and the second cooling chamber 42.

[0280] It is understood that the cooling medium inlet channel 30 can also be formed during the manufacturing of the housing 1. In this case, the cooling medium inlet channel 30 can be a straight segment structure, an annular structure, etc., as long as the cooling medium is guided to the first cooling chamber 41 and the second cooling chamber 42. This disclosure does not limit the shape of the cooling medium inlet channel 30.

[0281] In some embodiments, the cooling medium inlet channel 30 may further include a first cooling medium inlet channel and a second cooling medium inlet channel; the first cooling medium inlet channel is provided with a first connecting port and a liquid inlet 141; the second cooling medium inlet channel is provided with a second connecting port and a liquid inlet 141.

[0282] In the above-described structure of some embodiments of this disclosure, compared to a single cooling medium inlet channel 30 simultaneously connecting the first cooling chamber 41 and the second cooling chamber 42, when dedicated cooling medium inlet channels 30 are provided for the first cooling chamber 41 and the second cooling chamber 42 respectively, not only can the structure of the cooling medium inlet channel 30 be simplified, but it is also convenient to regulate the flow rate of the cooling medium entering the first cooling chamber 41 and the second cooling chamber 42, which is beneficial to further improve the cooling effect of the stator 2.

[0283] In some embodiments, a first cooling medium inlet channel is provided on end plate 11, and / or a second cooling medium inlet channel is provided on end plate 11.

[0284] It is understood that there are three ways to set the first cooling medium inlet channel and the second cooling medium inlet channel 30: the first cooling medium inlet channel is set on the end plate 11; the second cooling medium inlet channel is set on the end plate 11; and the first cooling medium inlet channel and the second cooling medium inlet channel are set on the end plate 11 at the same time. Those skilled in the art can choose according to actual needs.

[0285] In some embodiments, the housing 1 is provided with a wiring cavity 45, which is located on the side of the side plate 402 away from the stator 2, and the end face of the end plate 11 at the opening of the wiring cavity 45 is provided with a liquid inlet 141.

[0286] In some embodiments, the cooling medium outflow channel 12 is disposed on the end plate 11, and the cooling medium outflow channel 12 includes: a liquid outlet 151, a third connecting port and a fourth connecting port; the liquid outlet 151 is used to communicate with an external cooling device; the third connecting port and the fourth connecting port are arranged radially spaced along the stator 2, the third connecting port is connected to the first cooling chamber 41, and the fourth connecting port is connected to the second cooling chamber 42.

[0287] In the above-described structure of some embodiments of this disclosure, by connecting the liquid outlet 151 to an external circulating cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2. Furthermore, since a third connecting port communicating with the first cooling chamber 41 and a fourth connecting port communicating with the second cooling chamber 42 are provided, the cooling medium that has completed heat exchange can flow into the cooling medium outlet channel 12 and flow through the liquid outlet 151 to the cooling device, thus realizing the circulation of the cooling medium.

[0288] In some embodiments, the cooling medium outlet channel 12 has a groove-shaped structure that extends radially along the stator 2. Along the radial direction of the stator 2, the stator 2 blocks the middle portion of the groove opening of the cooling medium outlet channel 12, and the two ends of the groove opening of the cooling medium outlet channel 12 are respectively a third connecting port and a fourth connecting port. Of course, the structure of the cooling medium outlet channel 12 can also be configured according to usage requirements, for example, by referring to the structure of the cooling medium inlet channel 30.

[0289] During the flow of the liquid medium, the stator 2 can be cooled to improve its cooling efficiency.

[0290] In some embodiments, the cooling medium inlet channel 30 is a liquid inlet 141, and / or the cooling medium outlet channel 12 is a liquid outlet 151. The structures described above in some embodiments of this disclosure can further simplify the structure of the cooling medium inlet channel 30 and the cooling medium outlet channel 12, reducing the processing difficulty of the housing 1.

[0291] In one embodiment, two liquid inlets 141 are provided: one liquid inlet 141 is opened on the end plate 11 to communicate with the first cooling chamber 41, and the other liquid inlet is also opened on the end plate 11 to communicate with the second cooling chamber 42. Two liquid outlets 151 are provided: one liquid outlet 151 is opened on the end plate 11 and communicates with the first cooling chamber 41, and the other liquid outlet 151 is opened on the end plate 11 and communicates with the second cooling chamber 42.

[0292] The housing 1 and the stator 2 enclose a cooling chamber 4, with the stator 2 in direct contact with the cooling medium within the cooling chamber 4. Therefore, in some embodiments of the stator cooling structure disclosed herein, the stator 2 directly contacts the cooling medium for heat exchange, and the heat from the stator 2 is carried away to the outside of the motor through the circulation of the cooling medium, thereby achieving cooling of the stator 2. This structure, where the stator 2 directly contacts the cooling medium for heat exchange, significantly improves the cooling effect on the stator 2 compared to structures that indirectly cool the stator 2.

[0293] Furthermore, a complete circulation path is established through the cooling component 3, allowing the cooling medium to be directly sprayed onto the stator 2, directly circulating the heat from the stator 2 to the outside of the motor. This effectively improves the motor's efficiency, torque density, and power density, as well as its continuous operating capability. Moreover, it further increases the motor's torque density and power density without increasing the motor's size.

[0294] This disclosure discloses a stator 2 in some embodiments, the stator 2 including the stator cooling structure described above. The stator cooling structure can significantly improve the cooling effect on the stator 2, thereby achieving effective cooling of the stator 2 and ensuring the working performance of the stator 2.

[0295] In some embodiments, the stator 2 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. Along the radial direction of the stator core 21, a portion of the stator winding 22 protrudes radially outward from the stator core 21 to form a first end winding 46. A portion of the stator winding 22 protrudes radially inward from the stator core 21 to form a second end winding 47.

[0296] In some embodiments of this disclosure, the cooling chamber 4 cools the first end winding 46 and the second end winding 47 respectively. When the first end winding 46 protrudes from the radially outer side of the stator core 21 and the second end winding 47 protrudes from the radially inner side of the stator core 21, the contact area between the stator winding 22 and the cooling medium is large, which is beneficial to improving the cooling effect of the stator 2.

[0297] In some embodiments, the housing 1 is provided with a wiring cavity 45, which is located on the side of the side plate 402 away from the stator winding 22. The stator 2 also includes a junction box, which is disposed in the wiring cavity 45 and is used to connect the leads of the first end winding 46 and / or the second end winding 47.

[0298] In practical applications, corresponding through holes need to be provided on the seal 5 to allow the lead wire to pass through and connect to the junction box. To prevent the cooling medium from leaking from the gap between the lead wire and the through hole, sealing treatment is required between the lead wire and the through hole, such as by setting a sealing ring.

[0299] This disclosure discloses an electric motor in some embodiments, the electric motor including a stator 2 as described above.

[0300] In practical applications, the stator 2 of the motors according to some embodiments of this disclosure exhibits better cooling performance. When the cooling effect of the stator 2 is improved, on the one hand, the overall temperature of the motor decreases, which increases the permanent magnet flux linkage and output torque, thereby increasing the motor's torque density and efficiency. On the other hand, the current flowing through the stator 2 can be appropriately increased, i.e., the electrical load is increased, which further increases the output torque and power, further improving the motor's torque density and power density. Furthermore, compared to structures that indirectly cool the stator 2, the stator cooling structure of some embodiments of this disclosure employs direct cooling, meaning the stator 2 is in direct contact with the cooling medium. This improves the cooling effect while saving space. Under the condition of meeting the same torque and power requirements, the motor using the stator cooling structure of some embodiments of this disclosure can be designed to be smaller in size and weight, which is beneficial for the motor and vehicle space layout, and also for vehicle lightweighting.

[0301] In some embodiments, the motor further includes a rotating shaft 7 and a rotor 6. The stator 2 and the rotor 6 are spaced apart along the axial direction of the rotating shaft 7, and the rotor 6 is fixedly connected to the rotating shaft 7. The stator 2 is rotatably connected to the rotating shaft 7 so that the rotor can rotate relative to the stator 2.

[0302] In some embodiments of this disclosure, during motor operation, the electromagnetic interaction between the stator 2 and the rotor 6 drives the rotor 6 to rotate and output power. By spaced the rotor 6 and the stator 2, i.e., by creating a certain air gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance losses, which is beneficial for improving the energy conversion efficiency and output power of the motor.

[0303] In some embodiments, the stator 2 includes two stators, one stator 2 disposed on one side of the rotor 6 and the other stator 2 disposed on the other side of the rotor 6 along the axial direction of the stator 2.

[0304] It should be noted that the accompanying drawings of some embodiments of this disclosure only show the case where the motor has two stators 2 and a single rotor 6. In practical applications, the motor in some embodiments of this disclosure can also be a single stator 2 and a single rotor 6, or a motor with N stators 2 and N-1 rotors 6. No limitation is made here, and those skilled in the art can adjust it according to actual needs. The motor can be used as a drive motor or a generator.

[0305] The housing 1 also includes a bearing chamber 403, which is disposed inside the end plate 11 and the seal 5. The bearing chamber 403 is used to mount the bearing 44. The bearing 44 is sleeved on the rotating shaft 7, and the outer ring of the bearing 44 is fixedly connected to the inner wall of the bearing chamber 403, while the inner ring of the bearing 44 is fixedly connected to the rotating shaft 7, so that the rotating shaft 7 can rotate relative to the housing 1. In addition, the motor also includes a position sensor (not shown in the figure), which is disposed inside the housing 1 and close to the rotating shaft 7, so as to transmit the position information of the motor to the motor controller in real time during motor operation.

[0306] The motor disclosed in some embodiments of this disclosure can be an axial flux motor, which can be used in vehicles. This axial flux motor has advantages such as small size, light weight, and high efficiency.

[0307] This disclosure provides embodiments of a powertrain, which includes the aforementioned electric motor. The powertrain can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc., and can also be hybrid, pure electric, range-extended, etc.

[0308] It should be noted that in some embodiments of this disclosure, the structure of the motor is the same as that of the motor in any of the above embodiments, and its beneficial effects are similar, so they will not be described in detail here.

[0309] Some embodiments of this disclosure also disclose a vehicle that includes the motor described above, or includes the powertrain described above.

[0310] This disclosure provides a stator cooling structure according to some embodiments. The stator cooling structure of this disclosure will be described in detail below with reference to the accompanying drawings.

[0311] Axial flux motors are widely used in electric vehicles due to their advantages such as small size, high torque density, high power density, and high efficiency. During operation, the motor experiences various losses, leading to heat generation; the stator is the primary heat-generating component.

[0312] In related technologies, cooling medium is introduced into the motor to bring it into contact with the stator, thereby cooling the stator. However, the cooling medium often fails to make sufficient contact with the stator for heat exchange, resulting in poor stator cooling performance.

[0313] To solve the above problems, as shown in Figures 17 to 20, this disclosure provides a stator cooling structure, including: a housing 1 for accommodating a stator 2, the housing 1 and the stator 2 enclosing a cooling chamber 4; and a cooling assembly 3 that divides the cooling chamber 4 into an outer chamber and an inner chamber, wherein a cooling medium can enter the inner chamber from the outer chamber.

[0314] In some embodiments of this disclosure, on the one hand, since the housing 1 and the stator 2 enclose a cooling chamber 4, the cooling medium entering the cooling chamber 4 can fully contact and exchange heat with the stator 2, which is beneficial to improving the cooling effect of the stator 2. On the other hand, since the cooling assembly 3 divides the cooling chamber 4 into an outer chamber and an inner chamber, when the stator 2 is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly 3, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator 2, which is beneficial to further improving the cooling effect of the stator 2.

[0315] It should be noted that the stator 2 includes a stator core 21 and stator windings 22 wound around the stator core 21. The cooling medium can exchange heat not only with the stator windings 22 but also with at least a portion of the stator core 21. Through the circulation of the cooling medium, the heat from the stator windings 22 and the stator core 21 can be carried away to the outside of the motor, thereby achieving the cooling of the stator 2. It is understandable that when the cooling effect of the stator 2 is improved, on the one hand, the overall temperature of the motor decreases, which can increase the permanent magnet flux linkage and output torque, thereby increasing the torque density and efficiency of the motor. On the other hand, the current flowing through the stator windings 22 can be appropriately increased (i.e., the electrical load is increased), thereby increasing the output torque and power, further improving the torque density and power density of the motor. Furthermore, compared to indirectly cooled motors, the direct cooling employed in some embodiments of this disclosure allows the cooling medium to directly contact the stator 2, improving cooling efficiency while saving space. Thus, under the condition of satisfying the same torque and power, the size and weight of the motor in some embodiments of this disclosure can be designed to be smaller, which is beneficial for powertrain and overall vehicle space layout, and also contributes to vehicle lightweighting. It should be noted that the cooling medium in some embodiments of this disclosure includes, but is not limited to, cooling oil (such as mineral oil), which also serves a lubricating function while cooling the stator windings 22.

[0316] In some embodiments of this disclosure, two cooling chambers 4 are provided, and the two cooling chambers 4 are arranged radially apart along the stator 2. The cooling chamber 4 located on the outer side is the first cooling chamber 41, which is used to cool the radially outer side of the stator 2. The cooling chamber 4 located on the inner side is the second cooling chamber 42, which is used to cool the radially inner side of the stator 2.

[0317] In practical applications, since the stator 2 is usually annular, by setting the first cooling chamber 41 and the second cooling chamber 42, the radial outer side and radial inner side of the stator 2 can be cooled respectively, thereby increasing the heat exchange contact area between the stator 2 and the cooling medium, which is beneficial to further improve the cooling effect of the stator 2.

[0318] In some embodiments, as shown in Figures 23 to 25, the stator 2 includes a stator core 21 and a stator winding 22 wound around the stator core 21. At least a portion of the stator winding 22 protrudes radially outward and radially inward from the stator core 21, forming a first end winding 221 and a second end winding 222, respectively. A first cooling chamber 41 is used to accommodate the first end winding 221, so that the cooling medium entering the first cooling chamber 41 contacts and exchanges heat with the first end winding 221. A second cooling chamber 42 is used to accommodate the second end winding 222, so that the cooling medium entering the second cooling chamber 42 contacts and exchanges heat with the second end winding 222. It should be noted that the stator winding 22 also includes a middle winding 223. The stator core 21 is provided with a mounting groove 212. By winding the middle winding 223 in the mounting groove 212, a reliable connection between the stator winding 22 and the stator core 21 can be achieved.

[0319] Generally speaking, the stator winding 22 is the main heat-generating component of the stator. When the first end winding 221 formed on the radially outer side of the stator core 21 is located in the first cooling chamber 41, and the second end winding 222 formed on the radially inner side of the stator core 21 is located in the second cooling chamber 42, the stator winding 22 can fully contact the cooling medium for heat exchange, thereby removing a large amount of heat generated by the stator winding 22, which is beneficial to improving the cooling effect of the stator 2.

[0320] In practical applications, the motor also includes a rotor 6, which is disposed within the housing 1. The rotor 6 and the stator 2 are spaced apart axially along the stator 2 to form an air gap. To prevent the cooling medium from leaking into the air gap and causing a decrease in motor performance, in some embodiments of this disclosure, the stator cooling structure also includes a sealing element 5. The sealing element 5 is disposed within the housing 1, and the sealing element 5, the housing 1, and the stator 2 enclose a first cooling chamber 41 and a second cooling chamber 42.

[0321] In some embodiments of this disclosure, a sealing element 5 is provided, and the sealing element 5, together with the housing 1 and the stator 2, forms a first cooling chamber 41 and a second cooling chamber 42. This improves the sealing performance of the first cooling chamber 41 and the second cooling chamber 42, effectively preventing the cooling medium from leaking into the air gap between the stator 2 and the rotor 6, which is beneficial to improving the working performance of the motor.

[0322] It should be noted that, in order to further improve the sealing effect between the seal 5 and the housing 1, the stator cooling structure of some embodiments of this disclosure further includes a first sealing ring, which is disposed between the seal 5 and the housing 1 so that the seal 5 and the housing 1 are sealed together.

[0323] In some embodiments, the housing 1 includes an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed at the end of the stator core 21 opposite to the sealing member 5. The first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are distributed at intervals in the radial direction of the stator 2, with the second side plate 13 close to the center of the end plate 11. The sealing member 5 is annular, with its outer annular surface connected to the first side plate 12 and its inner annular surface connected to the second side plate 13. Two first sealing rings are provided: one first sealing ring is disposed between the outer annular surface of the sealing member 5 and the first side plate 12, and the other first sealing ring is disposed between the inner annular surface of the sealing member 5 and the second side plate 13, thereby achieving a sealed connection between the sealing member 5 and the housing 1.

[0324] In some embodiments of this disclosure, the sealing element 5 includes a first sealing ring 51 and a second sealing ring 52. The first sealing ring 51 and the second sealing ring 52 are arranged radially apart along the stator 2 and are located outside the second sealing ring 52. The first sealing ring 51, together with the housing 1 and the stator 2, forms a first cooling chamber 41, and the second sealing ring 52, together with the housing 1 and the stator 2, forms a second cooling chamber 42. In this way, by providing the first sealing ring 51 and the second sealing ring 52, the first cooling chamber 41 and the second cooling chamber 42 can each form a closed space, thereby allowing the first end winding 221 and the second end winding 222 to be cooled respectively, which is beneficial to improving the cooling reliability of the stator 2.

[0325] For example, as shown in Figures 21 and 22, the housing 1 includes: an end plate 11, a first side plate 12, and a second side plate 13; the end plate 11 is disposed at one end of the stator 2 away from the sealing member 5, the first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are spaced apart radially in the stator 2, and the first side plate 12 is located outside the second side plate 13; the end plate 11, the first side plate 12, the sealing member 5 and the stator 2 enclose to form a first cooling chamber 41, and the end plate 11, the second side plate 13, the sealing member 5 and the stator 2 enclose to form a second cooling chamber 42.

[0326] In some embodiments, as shown in Figures 24 and 49, the stator core 21 includes two peripheral walls 211 spaced apart from the outside to the inside along the radial direction of the stator 2, namely the first peripheral wall 2111 and the second peripheral wall 2112. The first cooling chamber 41 is formed by the end plate 11, the first side plate 12, the first sealing ring 51 and the first peripheral wall 2111, and the second cooling chamber 42 is formed by the end plate 11, the second side plate 13, the second sealing ring 52 and the second peripheral wall 2112.

[0327] In some embodiments of this disclosure, when a first cooling chamber 41 and a second cooling chamber 42 are respectively provided, and the first cooling chamber 41 is surrounded by a first sealing ring 51, a first peripheral wall 2111, and an end plate 11 and a first side plate 12 of the housing 1, and the second cooling chamber 42 is surrounded by a second sealing ring 52, a second peripheral wall 2112, and an end plate 11 and a second side plate 13 of the housing 1, the inner and outer sides of the stator winding 22, that is, the first end winding 221 and the second end winding 222, can be cooled respectively, which is beneficial to further improve the cooling effect of the stator 2.

[0328] It should be noted that the second side plate 13 can be integrally formed with the end plate 11 and the first side plate 12, or it can be integrally formed with the seal 5. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the second side plate 13 is integrally formed with the end plate 11 and the first side plate 12, the second side plate 13 should be made of the same material as the end plate 11 and the first side plate 12, such as metal, thereby improving the structural strength of the housing 1. When the second side plate 13 is integrally formed with the seal 5, the second side plate 13 should be made of the same material as the seal 5, such as non-metallic material, thereby reducing the overall weight of the motor.

[0329] In some embodiments of this disclosure, the sealing member 5 further includes a sealing portion disposed between the first sealing ring 51 and the second sealing ring 52 and connected to the first sealing ring 51 and the second sealing ring 52 respectively.

[0330] In practical applications, the stator winding 22 includes multiple wires. When the multiple wires of the middle winding 223 are wound around the mounting groove 212 of the stator core 21, gaps exist between the multiple wires in the mounting groove 212, or between the wires and the edge of the mounting groove 212. This causes the cooling medium of the first cooling chamber 41 and the second cooling chamber 42 to leak into the air gap between the stator 2 and the rotor 6 through the aforementioned gaps. Based on this, in some embodiments of this disclosure, by providing a sealing part between the first sealing ring 51 and the second sealing ring 52, the leakage of cooling medium into the air gap can be effectively prevented, which is beneficial to improving the working performance of the motor.

[0331] In some embodiments of this disclosure, a mounting groove 212 extending radially along the stator core 21 is provided on the side of the stator core 21 near the sealing portion. The mounting groove 212 is used to mount the stator winding 22. The sealing portion is a sealing strip 53, which is adapted to be sealed to the mounting groove 212. In this way, the sealing groove 212 can be sealed by the sealing strip 53 and the mounting groove 212, effectively preventing the cooling medium from leaking into the air gap, which is beneficial to improving the working performance of the motor.

[0332] In some embodiments, since the seal 5 has a thickness in the axial direction of the stator 2, to avoid the seal 5 occupying the air gap, in one embodiment, the stator 2 has a first surface close to the rotor 6, and the seal 5 has a second surface close to the rotor 6, with the first and second surfaces being coplanar. This avoids the seal 5 occupying the air gap, which is beneficial for further improving the motor's operating performance.

[0333] In some embodiments of this disclosure, multiple mounting slots 212 are provided, spaced apart circumferentially along the stator core 21; multiple sealing strips 53 are provided, spaced apart circumferentially along the sealing element 5, with one sealing strip 53 embedded in one mounting slot 212. Thus, by embedding one sealing strip 53 in one mounting slot 212, a reliable seal can be achieved over the entire end face of the stator core 21, effectively preventing cooling medium leakage into the air gap.

[0334] It should be noted that some embodiments of this disclosure do not limit the number of mounting slots 212 and sealing strips 53, and those skilled in the art can adjust them according to actual needs. It is understood that the number of mounting slots 212 and sealing strips 53 should be consistent. By sealing one sealing strip 53 with one mounting slot 212, the entire end face of the stator core 21 can be sealed, effectively preventing leakage of the cooling medium.

[0335] In some embodiments of this disclosure, the first sealing ring 51, the second sealing ring 52, and the sealing strip 53 are integrally formed. This improves the overall structural strength of the seal 5, thus extending its service life. Furthermore, the absence of gaps between the first sealing ring 51 and the sealing strip 53, and between the second sealing ring 52 and the sealing strip 53, enhances the sealing performance of the entire seal 5. Additionally, the absence of additional assembly steps between the first sealing ring 51, the second sealing ring 52, and the multiple sealing strips 53 simplifies the motor assembly process, reduces assembly requirements, and improves assembly efficiency.

[0336] In some embodiments of this disclosure, the cooling assembly 3 includes a first cooling element and a second cooling element arranged radially spaced along the stator 2. The first cooling element is disposed in the first cooling chamber 41 to divide the first cooling chamber 41 into a first outer chamber 411 and a first inner chamber 412, and the cooling medium can enter the first inner chamber 412 from the first outer chamber 411. The second cooling element is disposed in the second cooling chamber 42 to divide the second cooling chamber 42 into a second outer chamber 421 and a second inner chamber 422, and the cooling medium can enter the second inner chamber 422 from the second outer chamber 421. In this way, by providing the first cooling element in the first cooling chamber 41 and the second cooling element in the second cooling chamber 42, both the first end winding 221 and the second end winding 222 of the stator winding 22 can be sufficiently and uniformly cooled, which is beneficial to further improving the cooling sufficiency and uniformity of the stator winding 22.

[0337] As shown in Figure 20, the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, and the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42 are schematically illustrated by shading. In some optional embodiments of this application, the cooling medium pressure in the first outer chamber 411 is greater than the cooling medium pressure in the first inner chamber 412, and the cooling medium pressure in the second outer chamber 421 is greater than the cooling medium pressure in the second inner chamber 422.

[0338] Taking the first cooling chamber 41 as an example, since the cooling medium pressure in the first outer chamber 411 is greater than that in the first inner chamber 412, i.e., there is a pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium can enter the first inner chamber 412 at a higher pressure and circulate fully within the first chamber. This allows the cooling medium to fully contact and exchange heat with the first end winding 221, which is beneficial to improving the cooling effect of the stator 2. The second cooling chamber 42 works similarly and will not be described in detail here.

[0339] It should be noted that some embodiments of this disclosure do not limit the cooling medium pressure of the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, and the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0340] In some embodiments, the first cooling element is a first spray ring 31, which is provided with a first spray hole 311 for spraying the cooling medium from the first outer chamber 411 into the first inner chamber 412. The second cooling element is a second spray ring 32, which is provided with a second spray hole 321 for spraying the cooling medium from the second outer chamber 421 into the second inner chamber 422.

[0341] In some embodiments of this disclosure, by providing a first spray ring 31 with a first spray hole 311, as the pressure of the cooling medium in the first outer chamber 411 increases, the cooling medium can be sprayed from the first spray hole 311 into the first inner chamber 412 to contact and exchange heat with the first end winding 221. By providing a second spray ring 32 with a second spray hole 321, as the pressure of the cooling medium in the second outer chamber 421 increases, the cooling medium can be sprayed from the second spray hole 321 into the second inner chamber 422 to contact and exchange heat with the second end winding 222. Since the sprayed cooling medium is usually a fine liquid, the contact heat exchange area between the cooling medium and the first end winding 221, and between the cooling medium and the second end winding 222, can be increased, allowing the cooling medium to fully contact and exchange heat with the stator winding 22, thereby improving the cooling effect of the stator 2.

[0342] Furthermore, due to the pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium in the first outer chamber 411 can be sprayed into the first inner chamber 412 at a higher injection pressure; similarly, due to the pressure difference between the second outer chamber 421 and the second inner chamber 422, the cooling medium in the second outer chamber 421 can be sprayed into the second inner chamber 422 at a higher injection pressure. Thus, on the one hand, the higher injection pressure allows the sprayed liquid to be finer, thereby further increasing the contact area between the cooling medium and the stator winding 22. On the other hand, for the stator winding 22, which consists of multiple conductors, the higher injection pressure allows the cooling medium to enter the gaps between adjacent conductors, thereby improving the sufficiency and uniformity of cooling of the stator winding 22.

[0343] It should be noted that in some embodiments of this disclosure, the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) can be integrally formed with the sealing element 5, or it can be a separate molding structure. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) and the sealing element 5 are integrally formed, there will be no joint gap between the cooling assembly 3 and the sealing element 5, which is beneficial to improving the sealing performance of the first and second chambers. Furthermore, it can simplify the motor assembly process, reduce the motor assembly requirements, and improve the motor assembly efficiency.

[0344] It should be noted that, in order to further improve the sealing effect between the cooling assembly 3 and the housing 1, the stator cooling structure of some embodiments of this disclosure further includes a second sealing ring. The second sealing ring is disposed between the cooling assembly 3 and the housing 1 to achieve a sealed connection between the cooling assembly 3 and the housing 1. In one embodiment, the end of the first spray ring 31 facing away from the first sealing ring 51 and the end of the second spray ring 32 facing away from the second sealing ring 52 are connected to the end plate 11. Two second sealing rings are provided: one second sealing ring is disposed between the first spray ring 31 and the end plate 11, and the other second sealing ring is disposed between the second spray ring 32 and the end plate 11, thereby achieving a sealed connection between the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) and the housing 1.

[0345] In some embodiments of this disclosure, a plurality of first spray holes 311 are provided, and the plurality of first spray holes 311 are spaced apart circumferentially along the first spray ring 31. And / or, the plurality of first spray holes 311 are spaced apart axially along the first spray ring 31.

[0346] In some embodiments of this disclosure, by arranging a plurality of first spray holes 311 circumferentially spaced along the first spray ring 31, and / or arranging a plurality of first spray holes 311 axially spaced along the first spray ring 31, the cooling medium of the first outer chamber 411 can be uniformly sprayed into the first inner chamber 412 from multiple directions. This increases the contact area between the cooling medium and the first end winding 221, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the entire circumference of the first end winding 221, which is beneficial for improving the cooling uniformity of the stator 2.

[0347] In some embodiments of this disclosure, a plurality of second spray holes 321 are provided, and the plurality of second spray holes 321 are spaced apart circumferentially along the second spray ring 32. And / or, the plurality of second spray holes 321 are spaced apart axially along the second spray ring 32.

[0348] In some embodiments of this disclosure, by arranging a plurality of second spray holes 321 circumferentially spaced along the second spray ring 32, and / or arranging a plurality of second spray holes 321 axially spaced along the second spray ring 32, the cooling medium of the second outer chamber 421 can be uniformly sprayed into the second inner chamber 422 from multiple directions. This increases the contact area between the cooling medium and the second end winding 222, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the second end winding 222 throughout its entire circumference, which is beneficial for improving the cooling uniformity of the stator 2.

[0349] It should be noted that, taking the first spray hole 311 as an example, some embodiments of this disclosure do not limit the number, size, or spacing of the first spray holes 311, and those skilled in the art can adjust them according to actual needs. It is understood that, provided the first spray ring 31 has sufficient structural strength, increasing the number of first spray holes 311 can improve the spray uniformity of the first spray ring 31 to a certain extent. Therefore, in some embodiments, if multiple first spray holes 311 located on the same circumference are defined as a row of first spray holes 311, those skilled in the art can increase the number of first spray holes 311 by setting multiple rows (greater than or equal to two rows) of first spray holes 311 to improve the spray uniformity of the first spray ring 31, thereby further improving the cooling uniformity of the first end winding 221. The second spray hole 321 is similar and will not be described in detail here. In one embodiment, as shown in FIG26, the first spray holes 311 are provided in three rows, and the three rows of first spray holes 311 are spaced apart along the axial direction of the stator 2. The second spray hole 321 is provided in three rows, and the three rows of second spray holes 321 are spaced apart along the axial direction of the stator 2.

[0350] In some embodiments of this disclosure, the first spray ring 31 extends axially along the stator 2, such that the first outer chamber 411 and the first inner chamber 412 are radially spaced apart along the stator 2. The second spray ring 32 extends axially along the stator 2, such that the second outer chamber 421 and the second inner chamber 422 are radially spaced apart along the stator 2. This allows the first end winding 221 in the first inner chamber 412 and the second end winding 222 in the second inner chamber 422 to fully contact and exchange heat with the fine liquid cooling medium. Furthermore, it allows the first peripheral wall 2111 of the stator core 21 to be completely located in the first inner chamber 412 and the second peripheral wall 2112 to be completely located in the second inner chamber 422, thereby ensuring sufficient contact and heat exchange between the stator core 21 and the fine liquid cooling medium, further improving the cooling effect of the stator 2.

[0351] In some embodiments of this disclosure, the housing 1 is provided with a cooling medium channel, which is connected to the first cooling chamber 41 and the second cooling chamber 42 respectively. In some embodiments, the cooling medium channel includes an inlet channel 14 and an outlet channel 15, the inlet channel 14 being connected to the first outer chamber 411 and the second outer chamber 421 respectively, and the outlet channel 15 being connected to the first inner chamber 412 and the second inner chamber 422 respectively.

[0352] In some embodiments of this disclosure, cooling medium channels (i.e., inlet channel 14 and outlet channel 15) are provided. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421, allowing the cooling medium processed by the external cooling device to enter the first outer chamber 411 and the second outer chamber 421. The outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422, allowing the cooling medium after heat exchange with the stator 2 to be discharged to the external cooling device for processing. This enables the circulation of the cooling medium, thereby achieving continuous cooling of the stator 2 and improving the cooling effect of the stator 2.

[0353] In some embodiments of this disclosure, the liquid inlet channel 14 and the liquid outlet channel 15 satisfy at least one of the following: the liquid inlet channel 14 is disposed on at least one of the end plate 11 and the first side plate 12; and the liquid outlet channel 15 is disposed on at least one of the end plate 11 and the first side plate 12. By directly integrating the liquid inlet channel 14 onto at least one of the end plate 11 and the first side plate 12, or by directly integrating the liquid outlet channel 15 onto at least one of the end plate 11 and the first side plate 12, this arrangement not only avoids the inconvenience of pipe connection, but also allows the liquid inlet channel 14 and the liquid outlet channel 15 to be as close as possible to the cooling chamber 4, which is beneficial to improving the cooling effect.

[0354] It should be noted that, taking one inlet channel 14 or outlet channel 15 as an example, there are three ways to set them: (1) only set on the end plate 11, (2) only set on the first side plate 12, (3) set on both the end plate 11 and the first side plate 12. Those skilled in the art can choose according to actual needs. In addition, some embodiments of this disclosure do not limit the number of inlet channels 14 and outlet channels 15. Those skilled in the art can adjust them according to actual needs. In one embodiment, the motor includes two housings 1 that are arranged opposite to each other along the axial direction of the stator 2 and connected to each other. For each housing 1, only one inlet channel 14 and one outlet channel 15 can be set. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421 respectively, and the outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422 respectively.

[0355] In some embodiments of this disclosure, as shown in Figures 21 and 22, a liquid inlet channel 14 is disposed on an end plate 11. The liquid inlet channel 14 includes a liquid inlet 141, a first connecting port 142, and a second connecting port 143. The liquid inlet 141 is used to communicate with an external cooling device. The first connecting port 142 and the second connecting port 143 are arranged radially at intervals along the stator 2. The first connecting port 142 communicates with the first outer chamber 411, and the second connecting port 143 communicates with the second outer chamber 421. The liquid inlet fluid domain 61 and the liquid spraying fluid domain 62 are shown in Figure 27.

[0356] In some embodiments of this disclosure, by connecting the liquid inlet 141 and the liquid outlet 151 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2 and improving the reliability of the motor. Furthermore, since a first connecting port 142 communicating with the first outer chamber 411 and a second connecting port 143 communicating with the second outer chamber 421 are provided, the cooling medium from the cooling device can enter the liquid inlet channel 14 through the liquid inlet 141 and be diverted to the first outer chamber 411 and the second outer chamber 421.

[0357] It should be noted that this disclosure does not limit the structure of the liquid inlet channel 14 and the liquid outlet channel 15, and those skilled in the art can make adjustments according to actual needs. Taking the liquid inlet channel 14 provided on the end plate 11 as an example, the liquid inlet channel 14 can be a channel formed inside the end plate 11, or it can be a groove formed on the surface of the end plate 11 and can form a channel with the stator core 21. The liquid outlet channel 15 is similar.

[0358] In some embodiments of this disclosure, the liquid inlet channel 14 includes a first liquid inlet channel and a second liquid inlet channel; the first liquid inlet channel is connected to the first outer chamber 411; and the second liquid inlet channel is connected to the second outer chamber 421.

[0359] In some embodiments of this disclosure, a first liquid inlet channel and a second liquid inlet channel are provided, with the first liquid inlet channel communicating with the first outer chamber 411 and the second liquid inlet channel communicating with the second outer chamber 421. This simplifies the structure of the liquid inlet channel 14 compared to having a single liquid inlet channel 14 simultaneously communicating with both the first and second outer chambers 411 and 421. Furthermore, it facilitates the control of the cooling medium flow rate entering the two cooling chambers 4, thereby further improving the cooling effect of the stator 2. In some embodiments, the first liquid inlet channel is located on the first side plate 12 or the end plate 11, and the second liquid inlet channel is located on the end plate 11. This facilitates the processing of the first and second liquid inlet channels and simplifies the structure of the housing.

[0360] In some embodiments of this disclosure, the liquid outlet channel 15 is disposed on the end plate 11. The liquid outlet channel 15 includes: a liquid outlet 151, a third connecting port 152 and a fourth connecting port 153. The liquid outlet 151 is used to communicate with an external cooling device. The third connecting port 152 and the fourth connecting port 153 are arranged radially at intervals along the stator 2. The third connecting port 152 communicates with the first inner chamber 412 and the fourth connecting port 153 communicates with the second inner chamber 422. The liquid outlet fluid domain 63 is shown in FIG28.

[0361] In some embodiments of this disclosure, by connecting the liquid outlet 151 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2 and improving the reliability of the motor. Furthermore, due to the provision of a third connecting port 152 communicating with the first inner chamber 412 and a fourth connecting port 153 communicating with the second inner chamber 422, the cooling medium that has completed heat exchange can flow into the liquid outlet channel 15 and then flow through the liquid outlet to the external cooling device, thus achieving the circulation of the cooling medium.

[0362] In some embodiments of this disclosure, the liquid outlet channel 15 includes a first liquid outlet channel and a second liquid outlet channel; the first liquid outlet channel is connected to the first inner chamber 412; and the second liquid outlet channel is connected to the second inner chamber 422.

[0363] In some embodiments of this disclosure, a first liquid outlet channel and a second liquid outlet channel are used, with the first liquid outlet channel communicating with the first inner chamber 412 and the second liquid outlet channel communicating with the second inner chamber 422. This simplifies the structure of the liquid inlet channel 14 compared to having a single liquid outlet channel 15 simultaneously communicating with both the first and second inner chambers 412 and 422. In some embodiments, both the first and second liquid outlet channels are located on the end plate 11, which facilitates the processing of the first and second liquid outlet channels and simplifies the structure of the housing.

[0364] In some embodiments of this disclosure, the liquid inlet channel 14 is a liquid inlet hole, and / or the liquid outlet channel 15 is a liquid outlet hole. This further simplifies the structure of the liquid inlet channel 14 and the liquid outlet channel 15, reducing the processing difficulty of the housing 1. In one embodiment, two liquid inlets are provided: one is located on the first side plate 12 to communicate with the first outer chamber 411, and the other is located on the end plate 11 to communicate with the second outer chamber 421. Two liquid outlets are also provided: one is located on the end plate 11 and communicates with the first inner chamber 412, and the other is located on the end plate 11 and communicates with the second inner chamber 422.

[0365] In summary, the stator cooling structure provided by some embodiments of this disclosure has at least the following advantages:

[0366] In some embodiments of this disclosure, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling assembly divides the cooling chamber into an outer chamber and an inner chamber, when the stator is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator, which is beneficial to further improving the cooling effect of the stator.

[0367] Some embodiments of this disclosure also provide a stator 2, including the stator cooling structure described above.

[0368] It should be noted that in some embodiments of this disclosure, the structure of the stator cooling structure is the same as that of the stator cooling structure described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0369] In some embodiments of this disclosure, the stator 2 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. At least a portion of the stator winding 22 protrudes from the radially outer and radially inner sides of the stator core 21 to form a first end winding 221 and a second end winding 222, respectively. The cooling assembly 3 is used to cool the first end winding 221 and / or the second end winding 222.

[0370] In practical applications, the stator winding 22 is the main heat-generating component of the stator 2. By setting the cooling assembly 3, the first end winding 221 and / or the second end winding 222 of the stator 2 can be cooled, thereby achieving the cooling of the stator 2.

[0371] In some embodiments of this disclosure, the housing 1 includes a first side plate 12 surrounding the stator core 21, with a mounting cavity 16 on the side of the first side plate 12 facing away from the stator core 21; the stator 2 also includes a junction box disposed within the mounting cavity 16, the junction box being used for electrical connection with the stator winding 22. Thus, through the connection between the junction box and the motor controller, and the connection between the motor controller and the power supply, the current in the stator winding 22 can be controlled in real time, enabling real-time control and switching of the motor's operating conditions. Furthermore, by placing the junction box on the side of the first side plate 12 facing away from the stator core 21, i.e., placing the junction box on the periphery of the housing 1, the axial dimension of the motor can be further reduced, which is beneficial for the miniaturization design of the motor.

[0372] In one embodiment, the junction box is electrically connected to the stator winding 22 via lead wires. The first side plate 12 and the first liquid spray ring 31 have through holes at positions corresponding to the first inner chamber 412. Lead wires are passed through these two through holes to connect to the stator winding 22. In another embodiment, the end plate 11 has a through hole at a position corresponding to the first inner chamber 412. Lead wires are passed through these through holes to connect to the stator winding 22. It should be noted that to prevent leakage of the cooling medium from the gap between the lead wires and the through holes, a sealing treatment is required between the lead wires and the through holes, such as by installing a sealing ring.

[0373] This disclosure also provides an electric motor in some embodiments, including: a rotating shaft 7, a rotor 6, and the aforementioned stator 2; the rotor 6 and the stator 2 are spaced apart axially on the rotating shaft 7; the rotating shaft 7 passes through the rotor 6 and the stator 2, and is fixedly connected to the rotor 6 and rotatably connected to the stator 2, so that the rotor 6 can rotate relative to the stator 2. Thus, during motor operation, the electromagnetic interaction between the stator 2 and the rotor 6 drives the rotor 6 to rotate and output power. By spaced the rotor 6 and the stator 2, i.e., by having a certain air gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance loss, which is beneficial for improving the energy conversion efficiency and output power of the motor.

[0374] It should be noted that in some embodiments of this disclosure, the structure of the stator 2 is the same as that of the stator 2 described in any of the above embodiments, and its beneficial effects are similar, so it will not be repeated here. Furthermore, the housing 1 of the stator cooling structure can also serve as the outer casing of the motor, which can further simplify the motor structure and help reduce the cost of the motor. In one embodiment, the housing 1 also includes a bearing chamber, which is disposed on the end plate 11 and located inside the second side plate 13. The bearing chamber is used to install the bearing 44. The bearing 44 is sleeved on the rotating shaft 7, and the outer ring of the bearing 44 is fixedly connected to the inner wall of the bearing chamber, while the inner ring of the bearing 44 is fixedly connected to the rotating shaft 7, so that the rotating shaft 7 can rotate relative to the housing 1. In addition, the motor also includes a position sensor, which is disposed inside the housing 1 and close to the rotating shaft 7, thereby transmitting the motor's position information to the motor controller in real time during motor operation.

[0375] In some embodiments of this disclosure, two stators 2 are provided, and the two stators 2 are provided on opposite axial sides of the rotor 6.

[0376] It should be noted that the accompanying drawings of some embodiments of this disclosure only show the case where the motor is a dual-stator 2 / single-rotor 6 motor. In actual applications, the motor in some embodiments of this disclosure can also be a single-stator 2 / single-rotor 6 motor, or an N-stator 2 / (N-1)-rotor 6 (N>2) motor. No limitation is made here, and those skilled in the art can make adjustments according to actual needs.

[0377] This disclosure also provides a powertrain in some embodiments, including the motor described in any of the above embodiments. The powertrain can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc.

[0378] It should be noted that in some embodiments of this disclosure, the structure of the motor is the same as that of the motor described in any of the above embodiments, and its beneficial effects are similar, so they will not be described in detail here.

[0379] Some embodiments of this disclosure also provide a vehicle including the above-described motor or powertrain.

[0380] It should be noted that in some embodiments of this disclosure, the structure of the motor or powertrain is the same as that of the motor or powertrain described in any of the above embodiments, and its beneficial effects are also similar, so it will not be described again here.

[0381] Axial flux motors are widely used in electric vehicles due to their advantages such as small size, high torque density, high power density, and high efficiency. During operation, the motor experiences various losses, leading to heat generation; the stator is the primary heat-generating component.

[0382] In related technologies, cooling medium is introduced into the motor to bring it into contact with the stator, thereby cooling the stator. However, the cooling medium often fails to make sufficient contact with the stator for heat exchange, resulting in poor stator cooling performance.

[0383] This disclosure provides a stator cooling structure in some embodiments. The stator cooling structure of some embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0384] As shown in Figures 29 to 36, this disclosure provides a stator cooling structure, including: a housing 1, which is used to accommodate a stator 2, and the housing 1 and the stator 2 enclose a cooling chamber 4; the housing 1 is provided with a cooling medium channel, which communicates with the cooling chamber 4 to cool the stator 2.

[0385] In some embodiments of this disclosure, on the one hand, since the housing 1 and the stator 2 enclose a cooling chamber 4, the cooling medium entering the cooling chamber 4 can fully contact and exchange heat with the stator 2, which is beneficial to improving the cooling effect of the stator 2. On the other hand, since the cooling chamber 4 is connected to the cooling medium channel, when the cooling medium channel is connected to an external cooling device, the cooling medium in the cooling chamber 4 can be circulated, thereby continuously cooling the stator 2, which is beneficial to further improving the cooling effect of the stator 2.

[0386] In some embodiments of this disclosure, the cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42; the first cooling chamber 41 and the second cooling chamber 42 are arranged radially apart along the stator 2 and located outside the second cooling chamber 42. The first cooling chamber 41 is used to cool the radially outer side of the stator 2, and the second cooling chamber 42 is used to cool the radially inner side of the stator 2.

[0387] In some embodiments of this disclosure, as shown in FIG40, the stator cooling structure further includes a cooling assembly 3. The cooling assembly 3 includes a first cooling element and a second cooling element arranged radially spaced along the stator 2. The first cooling element is disposed in the first cooling chamber 41 to divide the first cooling chamber 41 into a first outer chamber 411 and a first inner chamber 412, and the cooling medium can enter the first inner chamber 412 from the first outer chamber 411. The second cooling element is disposed in the second cooling chamber 42 to divide the second cooling chamber 42 into a second outer chamber 421 and a second inner chamber 422, and the cooling medium can enter the second inner chamber 422 from the second outer chamber 421. In this way, by providing the first cooling element in the first cooling chamber 41 and the second cooling element in the second cooling chamber 42, the first end winding 221 and the second end winding 222 of the stator winding 22 can both obtain sufficient and uniform cooling, which is beneficial to further improve the cooling sufficiency and uniformity of the stator winding 22.

[0388] In some embodiments, as shown in Figures 37 to 39, the stator 2 includes a stator core 21 and a stator winding 22 wound around the stator core 21. At least a portion of the stator winding 22 protrudes radially outward and radially inward from the stator core 21, forming a first end winding 221 and a second end winding 222, respectively. A first inner chamber 412 is used to accommodate the first end winding 221, so that the cooling medium entering the first inner chamber 412 contacts and exchanges heat with the first end winding 221. A second inner chamber 422 is used to accommodate the second end winding 222, so that the cooling medium entering the second inner chamber 422 contacts and exchanges heat with the second end winding 222. It should be noted that the stator winding 22 also includes a middle winding 223. The stator core 21 is provided with a mounting groove 212. By winding the middle winding 223 in the mounting groove 212, a reliable connection between the stator winding 22 and the stator core 21 can be achieved.

[0389] Generally speaking, the stator winding 22 is the main heat-generating component of the stator. When the first end winding 221 formed on the radially outer side of the stator core 21 is located in the first inner chamber 412 of the first cooling chamber 41, the cooling medium of the first outer chamber can enter the first inner chamber and fully contact the first end winding for heat exchange. When the second end winding 222 formed on the radially inner side of the stator core 21 is located in the second inner chamber 422 of the second cooling chamber 42, the cooling medium of the second outer chamber can enter the second inner chamber and fully contact the second end winding for heat exchange, thereby removing a large amount of heat generated by the stator winding 22, which is beneficial to improving the cooling effect of the stator 2.

[0390] As shown in Figures 32 and 34, the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, and the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42 are schematically illustrated by shading. In some embodiments of this disclosure, the cooling medium pressure in the first outer chamber 411 is greater than the cooling medium pressure in the first inner chamber 412, and the cooling medium pressure in the second outer chamber 421 is greater than the cooling medium pressure in the second inner chamber 422.

[0391] Taking the first cooling chamber 41 as an example, since the cooling medium pressure in the first outer chamber 411 is greater than that in the first inner chamber 412, i.e., there is a pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium can enter the first inner chamber 412 at a higher pressure and circulate fully within the first chamber. This allows the cooling medium to fully contact and exchange heat with the first end winding 221, which is beneficial to improving the cooling effect of the stator 2. The second cooling chamber 42 works similarly and will not be described in detail here.

[0392] It should be noted that this disclosure does not limit the cooling medium pressure of the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, or the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0393] In some embodiments, the first cooling element is a first spray ring 31, which is provided with a first spray hole 311 for spraying the cooling medium from the first outer chamber 411 into the first inner chamber 412. The second cooling element is a second spray ring 32, which is provided with a second spray hole 321 for spraying the cooling medium from the second outer chamber 421 into the second inner chamber 422.

[0394] In some embodiments of this disclosure, by providing a first spray ring 31 with a first spray hole 311, as the pressure of the cooling medium in the first outer chamber 411 increases, the cooling medium can be sprayed from the first spray hole 311 into the first inner chamber 412 to contact and exchange heat with the first end winding 221. By providing a second spray ring 32 with a second spray hole 321, as the pressure of the cooling medium in the second outer chamber 421 increases, the cooling medium can be sprayed from the second spray hole 321 into the second inner chamber 422 to contact and exchange heat with the second end winding 222. Since the sprayed cooling medium is usually a fine liquid, the contact heat exchange area between the cooling medium and the first end winding 221, and between the cooling medium and the second end winding 222, can be increased, allowing the cooling medium to fully contact and exchange heat with the stator winding 22, thereby improving the cooling effect of the stator 2.

[0395] Furthermore, due to the pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium in the first outer chamber 411 can be sprayed into the first inner chamber 412 at a higher injection pressure; similarly, due to the pressure difference between the second outer chamber 421 and the second inner chamber 422, the cooling medium in the second outer chamber 421 can be sprayed into the second inner chamber 422 at a higher injection pressure. Thus, on the one hand, the higher injection pressure allows the sprayed liquid to be finer, thereby further increasing the contact area between the cooling medium and the stator winding 22. On the other hand, for the stator winding 22, which consists of multiple conductors, the higher injection pressure allows the cooling medium to enter the gaps between adjacent conductors, thereby improving the sufficiency and uniformity of cooling of the stator winding 22.

[0396] It should be noted that in some embodiments of this disclosure, the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) can be integrally formed with the sealing element 5, or it can be a separate molding structure. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) and the sealing element 5 are integrally formed, there will be no joint gap between the cooling assembly 3 and the sealing element 5, which is beneficial to improving the sealing performance of the first and second chambers. Furthermore, it can simplify the motor assembly process, reduce the motor assembly requirements, and improve the motor assembly efficiency.

[0397] It should be noted that, in order to further improve the sealing effect between the cooling assembly 3 and the housing 1, the stator cooling structure of some embodiments of this disclosure further includes a second sealing ring. The second sealing ring is disposed between the cooling assembly 3 and the housing 1 to achieve a sealed connection between the cooling assembly 3 and the housing 1. In one embodiment, the end of the first spray ring 31 facing away from the first sealing ring 51 and the end of the second spray ring 32 facing away from the second sealing ring 52 are connected to the end plate 11. Two second sealing rings are provided: one second sealing ring is disposed between the first spray ring 31 and the end plate 11, and the other second sealing ring is disposed between the second spray ring 32 and the end plate 11, thereby achieving a sealed connection between the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) and the housing 1.

[0398] In some embodiments of this disclosure, a plurality of first spray holes 311 are provided, and the plurality of first spray holes 311 are spaced apart circumferentially along the first spray ring 31. And / or, the plurality of first spray holes 311 are spaced apart axially or radially along the first spray ring 31. Regarding the spaced arrangement of the plurality of first spray holes 311, when the first spray ring 31 extends axially along the stator 2, the plurality of first spray holes 311 are spaced apart axially along the first spray ring 31; when the first spray ring 31 extends radially along the stator 2, the plurality of first spray holes 311 are spaced apart radially along the first spray ring 31.

[0399] In some embodiments of this disclosure, by arranging a plurality of first spray holes 311 circumferentially spaced along the first spray ring 31, and / or arranging a plurality of first spray holes 311 axially or radially spaced along the first spray ring 31, the cooling medium of the first outer chamber 411 can be uniformly sprayed into the first inner chamber 412 from multiple directions. This increases the contact area between the cooling medium and the first end winding 221, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the entire circumference of the first end winding 221, which is beneficial for improving the cooling uniformity of the stator 2.

[0400] In some embodiments of this disclosure, multiple second spray holes 321 are provided, and the multiple second spray holes 321 are spaced apart circumferentially along the second spray ring 32. And / or, the multiple second spray holes 321 are spaced apart axially or radially along the second spray ring 32. Regarding the spaced arrangement of the multiple second spray holes 321, when the second spray ring 32 extends axially along the stator 2, the multiple second spray holes 321 are spaced apart axially along the second spray ring 32; when the second spray ring 32 extends radially along the stator 2, the multiple second spray holes 321 are spaced apart radially along the second spray ring 32.

[0401] In some embodiments of this disclosure, by arranging a plurality of second spray holes 321 circumferentially spaced along the second spray ring 32, and / or arranging a plurality of second spray holes 321 axially or radially spaced along the second spray ring 32, the cooling medium of the second outer chamber 421 can be uniformly sprayed into the second inner chamber 422 from multiple directions. This increases the contact area between the cooling medium and the second end winding 222, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the second end winding 222 throughout its entire circumference, which is beneficial for improving the cooling uniformity of the stator 2.

[0402] It should be noted that, taking the first spray hole 311 as an example, some embodiments of this disclosure do not limit the number, size, or spacing of the first spray holes 311, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the first spray ring 31 has sufficient structural strength, increasing the number of first spray holes 311 can improve the spray uniformity of the first spray ring 31 to a certain extent. Therefore, in some embodiments, if multiple first spray holes 311 located on the same circumference are defined as a row of first spray holes 311, those skilled in the art can increase the number of first spray holes 311 by setting multiple rows (greater than or equal to two rows) of first spray holes 311 to improve the spray uniformity of the first spray ring 31, thereby further improving the cooling uniformity of the first end winding 221. The second spray hole 321 is similar and will not be described in detail here.

[0403] In some embodiments of this disclosure, as shown in Figures 31 and 32, the first spray ring 31 extends radially along the stator so that the first outer chamber 411 and the first inner chamber 412 are spaced apart axially along the stator; the second spray ring 32 extends radially along the stator so that the second outer chamber 421 and the second inner chamber 422 are spaced apart axially along the stator. This allows the housing 1 to be positioned as close as possible to the stator winding 22, thereby reducing the radial dimension of the motor and facilitating motor miniaturization. Furthermore, the stator cooling structure includes lead wires connected to the stator winding 22. These lead wires typically originate from the outside of the stator winding 22, i.e., the first end winding 221. In this case, when the first spray ring 31 extends radially along the stator 2, the lead wires do not need to pass through the first spray ring 31, thereby improving the sealing effect of the first and second chambers.

[0404] In some embodiments of this disclosure, as shown in Figures 33 to 35, the first spray ring 31 extends radially along the stator 2 so that the first outer chamber 411 and the first inner chamber 412 are spaced apart along the axial direction of the stator 2; the second spray ring 32 extends axially along the stator 2 so that the second outer chamber 421 and the second inner chamber 422 are spaced apart along the radial direction of the stator 2.

[0405] Alternatively, the first spray ring 31 extends along the axial direction of the stator 2 so that the first outer chamber 411 and the first inner chamber 412 are distributed radially apart along the stator 2; the second spray ring 32 extends radially along the stator 2 so that the second outer chamber 421 and the second inner chamber 422 are distributed radially apart along the stator 2.

[0406] In some embodiments of this disclosure, the different extension directions of the first spray ring 31 and the second spray ring 32 allow for a more flexible arrangement of the cooling assembly 3. Furthermore, compared to the arrangement where the first spray ring 31 extends axially along the stator and the second spray ring 32 extends radially along the stator 2, when the first spray ring 31 extends radially along the stator 2, the lead wire does not need to pass through the first spray ring 31, thereby improving the sealing effect of the first outer chamber 411 and the first inner chamber 412. When the second spray ring 32 extends axially along the stator 2, the cooling medium channel communicating with the second inner chamber 422 does not need to pass through the second spray ring 32, thereby improving the sealing effect of the second outer chamber 421 and the second inner chamber 422.

[0407] In some embodiments of this disclosure, as shown in FIG40, the sealing member 5 further includes a sealing portion disposed between the first sealing ring 51 and the second sealing ring 52 and connected to the first sealing ring 51 and the second sealing ring 52 respectively.

[0408] In some embodiments, the cooling medium channel includes an inlet channel 14 and an outlet channel 15. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421, respectively, and the outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422, respectively.

[0409] In some embodiments of this disclosure, an inlet channel 14 and an outlet channel 15 are provided. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421, allowing the cooling medium processed by the external cooling device to enter the first outer chamber 411 and the second outer chamber 421. The outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422, allowing the cooling medium after heat exchange with the stator 2 to be discharged to the external cooling device for processing. This enables the circulation of the cooling medium, thereby achieving continuous cooling of the stator 2 and improving the cooling effect of the stator 2.

[0410] In some embodiments of this disclosure, the inlet channel 14 and the outlet channel 15 satisfy at least one of the following: the inlet channel 14 is disposed in at least one of the end plate 11 and the first side plate 12; and the outlet channel 15 is disposed in at least one of the end plate 11 and the first side plate 12.

[0411] In some embodiments of this disclosure, by directly integrating the liquid inlet channel 14 onto at least one of the end plate 11 and the first side plate 12, or by directly integrating the liquid outlet channel 15 onto at least one of the end plate 11 and the first side plate 12, this arrangement not only avoids the inconvenience of pipe connection, but also allows the liquid inlet channel 14 and the liquid outlet channel 15 to be as close as possible to the cooling chamber 4, which is beneficial to improving the cooling effect.

[0412] It should be noted that, taking one inlet channel 14 or outlet channel 15 as an example, there are three ways to set them: (1) only on the end plate 11, (2) only on the first side plate 12, and (3) simultaneously on both the end plate 11 and the first side plate 12. Those skilled in the art can choose according to actual needs. In addition, some embodiments of this disclosure do not limit the number of inlet channels 14 and outlet channels 15. Those skilled in the art can adjust them according to actual needs. In one embodiment, the motor includes two housings 1 that are arranged opposite to each other along the axial direction of the stator 2 and connected to each other. For each housing 1, only one inlet channel 14 and one outlet channel 15 can be set, or multiple inlet channels 14 and multiple outlet channels 15 can be set. There is no limitation here, and those skilled in the art can adjust them according to actual needs.

[0413] In some embodiments of this disclosure, the liquid inlet channel 14 is disposed on the end plate 11. The liquid inlet channel 14 includes: a liquid inlet 141, a first connecting port 142, and a second connecting port 143. The liquid inlet 141 is used to communicate with an external cooling device. The first connecting port 142 and the second connecting port 143 are arranged radially at intervals along the stator 2. The first connecting port 142 communicates with the first outer chamber 411, and the second connecting port 143 communicates with the second outer chamber 421. The liquid inlet fluid domain 61 and the liquid spraying fluid domain 62 are shown in FIG41.

[0414] In some embodiments of this disclosure, by connecting the liquid inlet 141 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator winding 22 and improving the reliability of the motor. Because a first connecting port 142 communicating with the first outer chamber 411 and a second connecting port 143 communicating with the second outer chamber 421 are provided, the cooling medium from the cooling device can enter the liquid inlet channel 14 through the liquid inlet 141 and be diverted to the first outer chamber 411 and the second outer chamber 421.

[0415] In some embodiments of this disclosure, by connecting the liquid outlet 151 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator winding 22 and improving the operational reliability of the motor. Furthermore, due to the provision of a third connection port communicating with the first inner chamber 412 and a fourth connection port communicating with the second inner chamber 422, the cooling medium that has completed heat exchange can flow into the liquid outlet channel 15 and then through the liquid outlet 151 to the cooling device, thus achieving the circulation of the cooling medium.

[0416] It should be noted that, based on the arrangement of the first spray ring 31 and / or the second spray ring 32 extending radially along the stator 2, taking the second spray ring 32 as an example, when the second spray ring 32 extends radially, in order to connect the inner second chamber 422 located on the inner side with the liquid outlet channel 15, a protrusion extending axially along the stator 2 can be provided on the side of the end plate 11 near the stator 2. The protrusion passes through the second spray ring 32 and at least partially extends into the second inner chamber 422. The liquid outlet channel 15 is located in the end plate 11 and the protrusion, thereby allowing the cooling medium in the second chamber to flow out. In this case, the third and fourth connecting ports are located at the ends of the protrusion. It should be noted that, in order to prevent the cooling medium from leaking from the gap between the protrusion and the second spray ring 32, a sealing treatment is required between the protrusion and the second spray ring 32, for example, by providing a sealing ring.

[0417] In some embodiments of this disclosure, the liquid outlet channel 15 includes a first liquid outlet channel and a second liquid outlet channel; the first liquid outlet channel is connected to the first inner chamber 412; and the second liquid outlet channel is connected to the second inner chamber 422.

[0418] In some embodiments of this disclosure, a first liquid outlet channel and a second liquid outlet channel are used, with the first liquid outlet channel communicating with the first inner chamber 412 and the second liquid outlet channel communicating with the second inner chamber 422. This simplifies the structure of the liquid inlet channel 14 compared to having a single liquid outlet channel 15 simultaneously communicating with both the first and second inner chambers 412 and 422. In some embodiments, the first liquid outlet channel is located on the end plate 11 or the first side plate 12, and the second liquid outlet channel is also located on the end plate 11. This facilitates the processing of the first and second liquid outlet channels and simplifies the structure of the housing 1.

[0419] In summary, the stator cooling structure provided by some embodiments of this disclosure has at least the following advantages:

[0420] In some embodiments of this disclosure, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling chamber is connected to the cooling medium channel, when the cooling medium channel is connected to an external cooling device, the cooling medium in the cooling chamber can be circulated, thereby continuously cooling the stator, which is beneficial to further improving the cooling effect of the stator.

[0421] Some embodiments of this disclosure also provide a stator 2, including the stator cooling structure described above.

[0422] It should be noted that in some embodiments of this disclosure, the structure of the stator cooling structure is the same as that of the stator cooling structure described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0423] In some embodiments, the stator 2 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. At least a portion of the stator winding 22 protrudes from the radially outer and radially inner sides of the stator core 21 to form a first end winding 221 and a second end winding 222, respectively. The cooling chamber 4 is used to cool the first end winding 221 and / or the second end winding 222.

[0424] In practical applications, the stator winding 22 is the main heat-generating component of the stator 2. The stator 2 can be cooled by the contact heat exchange between the cooling medium in the cooling chamber 4 and the first end winding 221 and the second end winding 222 respectively.

[0425] The bearing 44 motor is a core component of a vehicle, driving it. As a type of motor, the axial flux motor is also known as a disc motor.

[0426] Axial flux motors generate considerable heat during operation. To improve their efficiency, the stator needs to be cooled. Current technology involves injecting a cooling medium into the axial flux motor to cool the stator.

[0427] However, the above cooling method has the drawback that the cooling medium cannot make sufficient contact with the stator, resulting in poor cooling effect of the stator.

[0428] As shown in Figures 42 to 53, some embodiments of this disclosure disclose a stator cooling structure, which includes a housing 1 for accommodating a stator 2. The housing 1 and the stator 2 enclose a cooling chamber 4. The housing 1 is provided with a first cooling medium channel, and the stator 2 is provided with a second cooling medium channel 214. The first cooling medium channel communicates with the cooling chamber 4 through the second cooling medium channel 214.

[0429] The stator cooling structure disclosed in some embodiments of this disclosure can cool the stator 2 to reduce the temperature of the stator core 21 and stator winding 22, improve the cooling efficiency of the stator 2, and make the motor performance better.

[0430] The stator cooling structure disclosed in some embodiments of this disclosure includes a housing 1, with a stator 2 disposed within the housing 1, and the housing 1 can accommodate the stator 2. The housing 1 and the stator 2 enclose each other to form a cooling chamber 4, that is, the inner wall of the housing 1 can enclose the stator 2 to form a cooling chamber 4.

[0431] The housing 1 is provided with a first cooling medium channel, and the stator 2 is provided with a second cooling medium channel 214. The first cooling medium channel is connected to the cooling chamber 4 through the second cooling medium channel 214. The cooling medium can enter the second cooling medium channel 214 from the first cooling medium channel to cool the stator 2, and then enter the cooling chamber 4 from the second cooling medium channel 214 to cool the ends and part of the side of the stator 2, so as to improve the cooling efficiency of the stator 2, improve the performance of the stator 2, and thus improve the performance of the motor.

[0432] It should be noted that the cooling medium in some embodiments of this disclosure can be cooling oil, also known as anhydrous coolant. Of course, the above are merely examples of cooling media and are not intended to limit the cooling medium. In practical applications, those skilled in the art can select a suitable cooling medium according to their needs.

[0433] The stator cooling structure disclosed in some embodiments of this disclosure forms a cooling chamber 4 by enclosing a housing 1 and a stator 2. The housing 1 is provided with a first cooling medium channel, and the stator 2 is provided with a second cooling medium channel 214. The first cooling medium channel communicates with the cooling chamber 4 through the second cooling medium channel 214. The cooling medium can cool the stator core 21 of the stator 2 from the first cooling medium channel and the second cooling medium channel 214. The cooling medium then enters the cooling chamber 4 from the second cooling medium channel 214 to cool the stator winding 22 of the stator 2, thereby improving the cooling efficiency of the stator 2 and making the cooling efficiency of the stator 2 higher.

[0434] In some embodiments of this disclosure, a second cooling medium channel 214 is disposed in the stator core 21 of the stator 2, and the cooling medium in the second cooling medium channel 214 can cool one side of the stator core 21. This improves the cooling efficiency of the stator core 21, making the cooling efficiency of the stator core 21 more efficient.

[0435] In some embodiments, as shown in Figures 47 to 50, the second cooling medium channel 214 in some embodiments of this disclosure includes a first sub-cooling medium channel 2141, which extends radially along the stator 2 and communicates with the first cooling medium channel and the cooling chamber.

[0436] As shown in Figures 47 to 50, in some embodiments of this disclosure, the stator 2 includes a stator core 21 and a stator winding 22 wound on the stator core 21. The stator core 21 has an annular structure. The stator winding 22 at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. The stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221. The portion of the stator winding 22 wound around the axial side of the stator core 21 forms a middle winding 223.

[0437] In some embodiments of this disclosure, a second cooling medium channel 214 is disposed on the stator core 21 of the stator 2, and the cooling medium in the second cooling medium channel 214 is used to cool one axial side of the stator core 21. The cooling medium can enter the axial side of the stator core 21 from the first cooling medium channel to cool the axial end face of the stator core 21, thereby improving the cooling efficiency of the stator 2.

[0438] In some embodiments of this disclosure, the second cooling medium channel 214 includes a first sub-cooling medium channel 2141, which is disposed on the stator core 21 and extends radially along the stator core 21. Cooling medium can enter the first sub-cooling medium channel 2141 from the first cooling medium channel to cool the stator 2, thereby improving the cooling efficiency of the stator 2.

[0439] In some embodiments, as shown in Figures 47 to 50, the second cooling medium channel 214 in some embodiments of this disclosure further includes a second sub-cooling medium channel 2142. The second sub-cooling medium channel 2142 extends circumferentially along the stator 2 and is connected to the first sub-cooling medium channel 2141 and the first cooling medium channel, so that the cooling medium in the first cooling medium channel can enter the first sub-cooling medium channel through the second sub-cooling medium channel 2142.

[0440] As shown in Figures 47 to 50, in some embodiments of this disclosure, the second cooling medium channel 214 further includes a second sub-cooling medium channel 2142, which is also disposed on the stator core 21 and disposed along the circumference of the stator core 21.

[0441] The second sub-cooling medium channel 2142 is connected to the first sub-cooling medium channel 2141 and the first cooling medium channel. Cooling medium enters the first cooling medium channel and flows into the first sub-cooling medium channel 2141 and / or the second sub-cooling medium channel 2142 to cool the stator 2, thereby improving the cooling efficiency of the stator 2 and making the cooling efficiency of the stator 2 better.

[0442] In some embodiments, as shown in Figures 47 to 50, the first sub-cooling medium channel 2141 in some embodiments of this disclosure includes a plurality of first sub-cooling medium channels 2141, which are arranged at intervals along the circumferential direction of the stator 2.

[0443] As shown in Figures 47 to 50, in some embodiments of this disclosure, multiple first sub-cooling medium channels 2141 can be provided. These multiple first sub-cooling medium channels 2141 extend radially along the stator 2 and are arranged at intervals along the circumference of the stator 2. Cooling medium can enter the multiple first sub-cooling medium channels 2141 to cool the stator 2, thereby improving the cooling efficiency of the stator 2 and making its cooling efficiency even better.

[0444] In some embodiments of this disclosure, the second sub-cooling medium channel 2142 may also include a plurality of second sub-cooling medium channels 2142 arranged at radial intervals along the stator 2.

[0445] In some embodiments of this disclosure, the second sub-cooling medium channel 2142 may also include multiple channels, each arranged circumferentially along the stator 2 and radially spaced along the stator 2. Cooling medium can enter the multiple second sub-cooling medium channels 2142 to cool the stator 2, improving its cooling efficiency and making it more efficient.

[0446] It should be noted that in some embodiments of this disclosure, the second sub-cooling medium channel 2142 may be connected to multiple first sub-cooling medium channels 2141, or the second sub-cooling medium channel 2142 may be connected to only a portion of the multiple first sub-cooling medium channels 2141. This disclosure does not impose any limitations on these aspects in some embodiments. In practical applications, those skilled in the art can configure the channels as needed.

[0447] In some embodiments, as shown in Figures 47 to 50, the first sub-cooling medium channel 2141 and the second sub-cooling medium channel 2142 in some embodiments of this disclosure are both disposed on the stator core 21 of the stator 2.

[0448] As shown in Figures 47 to 50, the stator 2 includes a stator core 21 and a stator winding 22 wound on the stator core 21. The stator core 21 has a ring-shaped structure, and the coil is wound on the end face, outer circumferential surface and inner circumferential surface of the stator core 21 to form the stator winding 22.

[0449] In some embodiments of this disclosure, both the first sub-cooling medium channel 2141 and the second sub-cooling medium channel 2142 are disposed on the stator core 21, so that the stator core 21 is cooled by the cooling medium flowing through the first sub-cooling medium channel 2141 and the second sub-cooling medium channel 2142, thereby improving the cooling efficiency of the stator core 21. In some embodiments, after the stator core 21 is cooled, the stator core 21 can also cool the stator winding 22, which also helps to improve the cooling efficiency of the stator winding 22.

[0450] In some embodiments, as shown in Figures 45 and 46, the cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42, which are connected to a first sub-cooling medium channel. The first cooling chamber 41 and the second cooling chamber 42 are spaced apart along the radial direction of the stator 2, and the first cooling chamber 41 is located outside the second cooling chamber 42. The first cooling chamber 41 is used to cool the radially outer side of the stator 2, and the second cooling chamber 42 is used to cool the radially inner side of the stator 2.

[0451] As shown in Figures 45 and 46, in some embodiments of this disclosure, the cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42. The first cooling chamber 41 and the second cooling chamber 42 are connected to a first cooling medium channel, allowing the cooling medium entering through the first cooling medium channel to flow into the first cooling chamber 41 and the second cooling chamber 42. The first cooling chamber 41 and the second cooling chamber 42 are arranged radially apart along the stator 2. The first cooling chamber 41 is located outside the second cooling chamber 42. That is, along the radial direction of the stator 2, the first cooling chamber 41 is closer to the outer side of the stator 2, and the second cooling chamber 42 is closer to the inner side of the stator 2.

[0452] In some embodiments of this disclosure, a first cooling chamber 41 is located near the radially outer side of the stator 2 to cool the radially outer side of the stator 2. A second cooling chamber 42 is located near the radially inner side of the stator 2 to cool the radially inner side of the stator 2. This improves the cooling efficiency of the stator 2, resulting in higher cooling efficiency and better performance.

[0453] In some embodiments, as shown in Figures 45 and 46, the stator winding 22 of the stator 2 at least partially protrudes from the radial outer diameter of the stator core to form a first end winding 221, and the stator winding 22 at least partially protrudes from the radial inner diameter of the stator core 21 to form a second end winding 222; a first cooling chamber is used to accommodate the first end winding 221 so that the cooling medium contacts the first end winding 221 for heat exchange, and a second cooling chamber 42 is used to accommodate the second end winding 222 so that the cooling medium contacts the second end winding 222 for heat exchange.

[0454] As shown in Figures 45 and 46, in some embodiments of this disclosure, the stator winding 22 includes a stator core 21 and a stator winding 22. The stator winding 22 protrudes radially outward from the stator core 21 to form a first end winding 221, and the stator winding 22 protrudes radially outward from the stator core 21 to form a second end winding 222. That is, along the radial direction of the stator 2, the first end winding 221 is wound on the outer side of the stator 2, and the second end winding 222 is wound on the inner side of the stator 2. This allows the first end winding 221 to be located within the first cooling chamber 41, allowing the cooling medium to contact the first end winding 221 and exchange heat with it, thereby reducing the temperature of the first end winding 221 and improving the cooling efficiency of the stator 2. The second end winding 222 can be located in the second cooling chamber 42, and the cooling medium can contact the second end winding 222 to exchange heat with the second end winding 222, thereby reducing the temperature of the second end winding 222 and improving the cooling efficiency of the stator 2.

[0455] In some embodiments, the stator cooling structure further includes a cooling assembly 3, which is disposed in the first cooling chamber and / or the second cooling chamber, and the cooling assembly 3 can connect the first cooling medium channel and the second cooling medium channel 214.

[0456] The stator cooling structure disclosed in some embodiments of this disclosure further includes a cooling assembly 3. The cooling assembly 3 is disposed within a first cooling chamber and / or a second cooling chamber. The cooling assembly 3 connects a first cooling medium channel and a second cooling medium channel 214, allowing the cooling medium to pass from the first cooling medium channel through the cooling assembly 3 and enter the first cooling chamber and / or the second cooling chamber, thereby cooling at least one side of the stator 2 in both the axial and radial directions. This improves the cooling efficiency of the stator 2, resulting in higher cooling efficiency and better performance of the stator 2.

[0457] In some embodiments, the cooling assembly 3 is spaced apart from the stator 2 along the axial direction of the stator 2. Alternatively, the cooling assembly 3 is spaced apart from the stator 2 along the radial direction of the stator 2. Of course, the above are merely individual examples of the location of the cooling assembly 3 and are not intended to limit this disclosure. In practical applications, those skilled in the art can also set the location of the cooling assembly 3 as needed.

[0458] In some embodiments, as shown in Figures 45 and 46, the cooling assembly 3 in some embodiments of this disclosure includes a first cooling element 4111 and a second cooling element 4112, which are spaced apart along the radial direction of the stator 2. The first cooling element 4111 is disposed in a first cooling chamber 41 to divide the first cooling chamber 41 into a first sub-cooling chamber 511 and a second sub-cooling chamber 512. The cooling medium can enter the second sub-cooling chamber 512 from the first sub-cooling chamber 511. The first end winding 221 is located in the second sub-cooling chamber 512. The second cooling element 4112 is disposed in the second sub-cooling chamber 512 to divide the second sub-cooling chamber 512 into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522. The cooling medium can enter the fourth sub-cooling chamber 522 from the third sub-cooling chamber 521. The second end winding 222 is located in the fourth sub-cooling chamber 522. The first sub-cooling chamber 511 and the third sub-cooling chamber 521 are connected to the first sub-cooling medium channel 2141.

[0459] As shown in Figures 45 and 46, the cooling assembly 3 in some embodiments of this disclosure includes a first cooling element 4111 and a second cooling element 4112, which are radially spaced apart along the stator 2. The first cooling element 4111 is disposed within a first cooling chamber 41, dividing the first cooling chamber 41 into a first sub-cooling chamber 511 and a second sub-cooling chamber 512. A first end winding 221 is located within the second sub-cooling chamber 512. Cooling medium can flow from the first sub-cooling chamber 511 into the second sub-cooling chamber 512 to cool the first end winding 221, thereby improving the cooling efficiency of the first end winding 221 and making the cooling efficiency of the first end winding 221 higher.

[0460] In some embodiments of this disclosure, a second cooling element 4112 is disposed within a second cooling chamber 42 to divide the second cooling chamber 42 into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522. A second end winding 222 is located within the fourth sub-cooling chamber 522. Cooling medium can flow from the third sub-cooling chamber 521 into the fourth sub-cooling chamber 522 to cool the second end winding 222, thereby improving the cooling efficiency of the second end winding 222 and making the cooling efficiency of the second end winding 222 higher.

[0461] In some embodiments of this disclosure, the first sub-cooling chamber 511 and the third sub-cooling chamber 521 are connected to the first sub-cooling medium channel 2141, so that the cooling medium can enter the first sub-cooling chamber 511 and the third sub-cooling chamber 521 from the first sub-cooling medium channel 2141. The cooling medium can also enter the fourth sub-cooling chamber 522 from the third sub-cooling chamber 521 to cool the radially inner side of the stator 2. The cooling medium can also enter the second sub-cooling chamber 512 from the first sub-cooling chamber 511 to cool the radially outer side of the stator 2.

[0462] In some embodiments of this disclosure, the first cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel. The cooling medium enters the first sub-cooling chamber 511 from the cooling medium inlet channel, is sprayed into the second sub-cooling chamber 512 through the first cooling element, flows through the second cooling medium channel, and enters the cooling medium outlet channel; and / or, the cooling medium enters the third sub-cooling chamber 521 from the cooling medium inlet channel, is sprayed into the fourth sub-cooling chamber 522 through the second cooling element, flows through the second cooling medium channel, and enters the cooling medium outlet channel.

[0463] In some embodiments of this disclosure, the cooling medium can flow into the first sub-cooling chamber 511 from the cooling medium inlet channel. The cooling medium in the first sub-cooling chamber 511 flows through the first cooling element and is sprayed into the second sub-cooling chamber 512 to cool the first end winding 221. It then flows through the second cooling medium channel 214 and enters the cooling medium outlet channel, flowing out of the stator cooling structure.

[0464] In some embodiments of this disclosure, the cooling medium may also flow into the third sub-cooling chamber 521 from the cooling medium inlet channel. The cooling medium in the third sub-cooling chamber 521 flows through the second cooling element and is sprayed into the fourth sub-cooling chamber 522 to cool the second end winding 222. It then flows through the second cooling medium channel 214 and enters the cooling medium outlet channel, exiting the stator cooling structure.

[0465] In some embodiments, the pressure of the cooling medium in the first sub-cooling chamber 511 is greater than the pressure of the cooling medium in the second sub-cooling chamber 512; the pressure of the cooling medium in the third sub-cooling chamber 521 is greater than the pressure of the cooling medium in the fourth sub-cooling chamber 522.

[0466] In some embodiments of this disclosure, the pressure of the cooling medium in the first sub-cooling chamber 511 is greater than the pressure of the cooling medium in the second sub-cooling chamber 512. That is, there is a pressure difference between the first sub-cooling chamber 511 and the second sub-cooling chamber 512, allowing the cooling medium in the first sub-cooling chamber 511 to be injected into the second sub-cooling chamber 512 at a higher injection pressure. On one hand, the higher injection pressure allows the ejected cooling medium to be finer, thereby further increasing the contact area between the cooling medium and the first end winding 221. On the other hand, since the first end winding 221 includes multiple wires, the higher injection pressure allows the cooling medium to enter the gaps between adjacent wires, thereby further improving the sufficiency and uniformity of cooling the first end winding 221.

[0467] In some embodiments of this disclosure, the pressure of the cooling medium in the third sub-cooling chamber 521 is greater than the pressure of the cooling medium in the fourth sub-cooling chamber 522. That is, a pressure difference exists between the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522, allowing the cooling medium in the third sub-cooling chamber 521 to be injected into the fourth sub-cooling chamber 522 at a higher injection pressure. On one hand, the higher injection pressure allows the ejected cooling medium to be finer, thereby further increasing the contact area between the cooling medium and the second end winding 222. On the other hand, since the second end winding 222 includes multiple wires, the higher injection pressure allows the cooling medium to enter the gaps between adjacent wires, thereby further improving the sufficiency and uniformity of cooling the second end winding 222.

[0468] In some embodiments of this disclosure, a first spray ring is provided with a first spray hole 311, which is used to spray the cooling medium in the first sub-cooling chamber 511 into the second sub-cooling chamber 512 to cool the first end winding 221; a second spray ring is provided with a second spray hole 321, which is used to spray the cooling medium in the third sub-cooling chamber 521 into the fourth sub-cooling chamber 522 to cool the second end winding 222.

[0469] In some embodiments of this disclosure, a first spray hole 311 is provided on the first spray ring so that the cooling medium in the first sub-cooling chamber 511 can be sprayed into the second sub-cooling chamber 512 through the first spray hole 311 to cool the first end winding 221. A second spray hole 321 is provided on the second spray ring so that the cooling medium in the third sub-cooling chamber 521 can be sprayed into the fourth sub-cooling chamber 522 through the second spray hole 321 to cool the second end winding 222.

[0470] It should be noted that in some embodiments of this disclosure, the first spray hole 311 may include only one or more, and the multiple first spray holes 311 are arranged at intervals. The second spray hole 321 may include only one or more, and the multiple second spray holes 321 are arranged at intervals.

[0471] In some embodiments, the first spray hole 311 includes a plurality of first spray holes 311, which are arranged at intervals along the circumference of the first spray ring; the second spray hole 321 includes a plurality of second spray holes 321, which are arranged at intervals along the circumference of the second spray ring.

[0472] In some embodiments of this disclosure, a plurality of first spray holes 311 are provided on the first spray ring, and the plurality of first spray holes 311 are arranged at intervals along the circumference of the first spray ring, so that the cooling medium can be sprayed into the second sub-cooling chamber 512 from the plurality of first spray holes 311, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0473] In some embodiments of this disclosure, a plurality of second spray holes 321 are provided on the second spray ring, and the plurality of second spray holes 321 are arranged at intervals along the circumference of the second spray ring, so that the cooling medium can be sprayed into the fourth sub-cooling chamber 522 from the plurality of second spray holes 321, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0474] In some embodiments of this disclosure, a plurality of first spray rings are provided along the axial direction of the stator 2, and the plurality of first spray rings are spaced apart; and / or, a plurality of second spray rings are provided along the axial direction of the stator 2, and the plurality of second spray rings are spaced apart.

[0475] In some embodiments, the first spray ring includes multiple first spray rings, which are spaced apart along the axial direction of the stator 2. The cooling medium is sprayed into the second sub-cooling chamber 512 through the multiple first spray rings, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0476] In some embodiments, the second spray ring includes multiple second spray rings, which are spaced apart along the axial direction of the stator 2. The cooling medium is sprayed into the fourth sub-cooling chamber 522 through the multiple second spray rings, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0477] In some embodiments of this disclosure, the first spray ring and the second spray ring are configured in various ways.

[0478] In some embodiments, the first spray ring extends radially along the stator 2 so that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are spaced apart along the axial direction of the stator 2; the second spray ring extends radially along the stator 2 so that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are spaced apart along the axial direction of the stator 2.

[0479] In some embodiments, the first spray ring extends radially along the stator 2 so that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are spaced apart along the axial direction of the stator 2; the second spray ring extends axially along the stator 2 so that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are spaced apart along the radial direction of the stator 2.

[0480] In some embodiments, the first spray ring extends axially along the stator 2 so that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are distributed radially apart along the stator 2; the second spray ring extends radially along the stator 2 so that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are distributed axially apart along the stator 2.

[0481] In some embodiments, the first spray ring extends axially along the stator 2 so that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are radially spaced along the stator 2; the second spray ring extends axially along the stator 2 so that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are radially spaced along the stator 2.

[0482] Of course, the above are merely individual examples of the installation methods for the first and second spray rings and are not intended to limit this disclosure. In practical applications, technicians can also design the installation methods for the first and second spray rings as needed.

[0483] In some embodiments of this disclosure, the first cooling chamber 41 can be divided into a first sub-cooling chamber 511 and a second sub-cooling chamber 512 by a first spray ring. The first end winding 221 is located in the second sub-cooling chamber 512. The cooling medium in the first sub-cooling chamber 511 can be sprayed into the second sub-cooling chamber 512 through the first spray ring to cool the first end winding 221 located in the second sub-cooling chamber 512, thereby improving the cooling efficiency of the first end winding 221.

[0484] The second cooling chamber 42 can be divided into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522 by the second spray ring. The second end winding 222 is located in the fourth sub-cooling chamber 522. The cooling medium in the third sub-cooling chamber 521 can be sprayed into the fourth sub-cooling chamber 522 through the second spray ring to cool the second end winding 222 located in the fourth sub-cooling chamber 522, thereby improving the cooling efficiency of the second end winding 222.

[0485] In some embodiments, the stator cooling structure disclosed in this disclosure further includes a second sealing ring, which is disposed between the cooling assembly 3 and the housing 1 to provide a sealed connection between the cooling assembly 3 and the housing 1. The second sealing ring further enhances the sealing performance between the cooling assembly 3 and the housing 1, resulting in a better overall seal.

[0486] In some embodiments of this disclosure, the stator cooling structure further includes a sealing element 5, which, together with the housing 1 and the stator 2, forms a first cooling chamber 41 and a second cooling chamber 42.

[0487] In some embodiments of this disclosure, a first cooling chamber 41 and a second cooling chamber 42 are formed by enclosing a sealing member 5, a housing 1, and a stator 2, so that the first cooling chamber 41 and the second cooling chamber 42 are sealed chambers, thus avoiding leakage problems in the first cooling chamber 41 and the second cooling chamber 42.

[0488] In some embodiments, the stator 2 includes a stator core 21 and a stator winding 22 wound around the stator core 21. The stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221, and at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. A first cooling chamber 41 is used to accommodate the first end winding 221 so that the cooling medium entering the first cooling chamber 41 contacts and exchanges heat with the first end winding 221. A second cooling chamber 42 is used to accommodate the second end winding 222 so that the cooling medium entering the second cooling chamber 42 contacts and exchanges heat with the second end winding 222.

[0489] In some embodiments of this disclosure, the stator 2 includes a stator core 21 and a stator winding 22. The stator core 21 has a ring-shaped structure, and the stator winding 22 is wound on the stator core 21. Along the radial direction of the stator core 21, the stator winding 22 at least partially protrudes from the outer side of the stator core 21 to form a first end winding 221. Along the radial direction of the stator core 21, the stator winding 22 at least partially protrudes from the inner side of the stator core 21 to form a second end winding 222.

[0490] The first end winding 221 is located within the second sub-cooling chamber 512 of the first cooling chamber 41. The cooling medium entering the first sub-cooling chamber 511 of the first cooling chamber 41 can be sprayed into the second sub-cooling chamber 512 through the first spray ring to cool the first end winding 221. This improves the cooling efficiency of the first end winding 221, making its cooling efficiency more optimal.

[0491] The second end winding 222 is located in the fourth sub-cooling chamber 522 of the second cooling chamber 42. The cooling medium entering the third sub-cooling chamber 521 of the second cooling chamber 42 can be sprayed into the fourth sub-cooling chamber 522 through the second spray ring to cool the second end winding 222. This improves the cooling efficiency of the second end winding 222, making its cooling efficiency more optimal.

[0492] In some embodiments, the sealing member 5 includes a first sealing ring 31 and a second sealing ring 52, the first sealing ring 31 and the second sealing ring 52 are arranged radially apart along the stator 2 and are located outside the second sealing ring 52; the first sealing ring 31, together with the housing 1 and the stator 2, forms a first cooling chamber 41; the second sealing ring 52, together with the housing 1 and the stator 2, forms a second cooling chamber 42.

[0493] In some embodiments of this disclosure, the sealing element 5 includes a first sealing ring 31 and a second sealing ring 52. The first sealing ring 31 and the second sealing ring 52 are arranged radially apart along the stator 2, and the first sealing ring 31 is located outside the second sealing ring 52. The first sealing ring 31, the housing 1, and the stator 2 enclose a first cooling chamber 41. By sealing the first cooling chamber 41 with the first sealing ring 31, the sealing effect of the first cooling chamber 41 is improved, and leakage problems in the first cooling chamber 41 are avoided.

[0494] The second sealing ring 52, the housing 1 and the stator 2 enclose and form the second cooling chamber 42. The second sealing ring 52 seals the second cooling chamber 42, making the sealing effect of the second cooling chamber 42 better and avoiding leakage problems in the second cooling chamber 42.

[0495] In some embodiments of this disclosure, the seal 5 further includes a sealing portion 33, which is disposed between the first sealing ring 31 and the second sealing ring 52 and connected to the first sealing ring 31 and the second sealing ring 52 respectively.

[0496] The sealing element 5 disclosed in some embodiments of this disclosure further includes a sealing portion 33, which is connected between the first sealing ring 31 and the second sealing ring 52, so as to connect the sealing element 5 to the stator 2 through the sealing portion 33 and seal the stator 2.

[0497] In some embodiments of this disclosure, the connection method between the sealing portion 33 and the first sealing ring 31 and the second sealing ring 52 is not limited. In practical applications, those skilled in the art can configure it as needed. In some embodiments, the sealing portion 33 is connected between the first sealing ring 31 and the second sealing ring 52, and is integrally formed with the first sealing ring 31 and the second sealing ring 52. The sealing portion 33 is welded between the first sealing ring 31 and the second sealing ring 52.

[0498] In some embodiments of this disclosure, the stator core 21 near the sealing portion 33 is provided with a mounting groove 212 extending radially along the stator core 21. The mounting groove 212 is used to mount the stator winding 22. The sealing portion 33 is a sealing strip, which is adapted to be sealed to the mounting groove 212.

[0499] In some embodiments of this disclosure, a mounting groove 212 extending radially along the stator core 21 is provided on the side of the stator core 21 near the sealing portion 33, and the wires of the stator winding 22 are installed in the mounting groove 212 to fix the wires of the stator winding 22 through the mounting groove 212.

[0500] Because gaps exist between the multiple wires in the mounting groove 212, or between the wires and the edge of the mounting groove 212, the cooling medium in the first cooling chamber 41 and the second cooling chamber 42 may flow through these gaps into the gap between the stator 2 and the rotor 6. Therefore, in some embodiments of this disclosure, a sealing strip is placed inside the mounting groove 212 to seal it, preventing the cooling medium from flowing into the gap between the stator 2 and the rotor 6, thereby improving the motor's operating performance.

[0501] It should be noted that this disclosure does not limit the number of mounting slots 212 and sealing strips. In practical applications, technicians can set them as needed. It is understood that the number of mounting slots 212 and sealing strips should be consistent. By sealing one sealing strip with one mounting slot 212, the entire end face of the stator core 21 can be sealed, effectively preventing leakage of cooling medium.

[0502] In some embodiments of this disclosure, the first sealing ring 31, the second sealing ring 52, and the sealing strip together form an integrally molded structure.

[0503] In some embodiments of this disclosure, the first sealing ring 31, the second sealing ring 52, and multiple sealing strips form an integrally molded structure. This improves the overall structural strength of the seal 5 and extends its service life. Furthermore, since there are no joint gaps between the first sealing ring 31 and the sealing strips, and between the second sealing ring 52 and the sealing strips, the sealing performance of the entire seal 5 is improved. Additionally, since no additional assembly steps are required between the first sealing ring 31, the second sealing ring 52, and the multiple sealing strips, the motor assembly process is simplified, assembly requirements are reduced, and assembly efficiency is improved.

[0504] In some embodiments, the stator cooling structure disclosed in this disclosure further includes a first sealing ring, which is disposed between the sealing member 5 and the housing 1 to make the sealing member 5 and the housing 1 sealed together.

[0505] In some embodiments of this disclosure, a first sealing ring is provided between the seal 5 and the housing 1. The provision of the first sealing ring helps to further improve the sealing effect between the seal 5 and the housing 1.

[0506] In some embodiments of this disclosure, the housing 1 includes an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed at one end of the stator 2 away from the seal 5. The first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are spaced apart radially from the stator 2. The first side plate 12 is located outside the second side plate 13. The end plate 11, the first side plate 12, the seal 5, and the stator 2 enclose a first cooling chamber 41, and the end plate 11, the second side plate 13, the seal 5, and the stator 2 enclose a second cooling chamber 42.

[0507] In some embodiments of this disclosure, the housing 1 includes an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed on the side of the stator 2 away from the seal 5. The first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11, are radially spaced apart from each other on the stator 2, and the first side plate 12 is located outside the second side plate 13. The housing 1 is formed by the end plate 11, the first side plate 12, and the second side plate 13.

[0508] The above configuration allows the end plate 11, the first side plate 12, the seal 5, and the stator 2 to enclose and form a first cooling chamber 41, and the end plate 11, the second side plate 13, the seal 5, and the stator 2 to enclose and form a second cooling chamber 42.

[0509] It should be noted that in some embodiments of this disclosure, the housing 1 includes two housings, which are arranged opposite each other along the axial direction of the stator 2 to form a closed housing.

[0510] It should be noted that, as shown in Figure 53, in some embodiments of this disclosure, the second side plate 13 can be integrally formed with the seal 5; and as shown in Figure 44, in some embodiments of this disclosure, the second side plate 13 can also be integrally formed with the housing 1. These designs simplify the motor assembly process, reduce the motor assembly requirements, and improve the motor assembly efficiency.

[0511] In some embodiments of this disclosure, the first cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel. The cooling medium inlet channel is connected to the first sub-cooling chamber 511 and the third sub-cooling chamber 521 respectively through the second cooling medium channel, and the cooling medium outlet channel is connected to the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 respectively.

[0512] In some embodiments of this disclosure, the cooling medium inlet channel is connected to the first sub-cooling chamber 511 and the third sub-cooling chamber 521 respectively via a second cooling medium channel, allowing the cooling medium to enter the first sub-cooling chamber 511 and the third sub-cooling chamber 521 through the cooling medium inlet channel. The cooling medium outlet channel is connected to the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 respectively, allowing the cooling medium in the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 to flow out through the cooling medium outlet channel.

[0513] In some embodiments of this disclosure, the stator cooling structure satisfies at least one of the following: a cooling medium inlet channel is provided in at least one of the end plate 11 and the first side plate 12; and a cooling medium outlet channel is provided in at least one of the end plate 11 and the first side plate 12.

[0514] In some embodiments of this disclosure, the stator cooling structure satisfies at least one of the following: the cooling medium inlet channel is directly integrated into at least one of the end plate 11 and the first side plate 12, and the cooling medium outlet channel is directly integrated into at least one of the end plate 11 and the first side plate 12. This avoids inconvenience in pipe connections and also allows the cooling medium inlet channel and the cooling medium outlet channel to be as close as possible to the cooling chamber 4 to improve the cooling effect.

[0515] It should be noted that in some embodiments of this disclosure, the cooling medium inlet channel and the cooling medium outlet channel may be provided only on the end plate 11, or only on the first side plate 12, or both on the end plate 11 and the first side plate 12. This disclosure does not impose excessive limitations on some embodiments; in practical applications, those skilled in the art can configure them as needed.

[0516] In some embodiments of this disclosure, a cooling medium inlet channel 30 is disposed on an end plate 11. The cooling medium inlet channel 30 includes an inlet and a first outlet. The inlet is used to communicate with an external cooling device, and the first outlet is communicated with a second cooling medium channel.

[0517] In some embodiments of this disclosure, the liquid inlet is connected to an external circulating cooling device to achieve circulation of the cooling medium, thereby continuously cooling the stator 2, improving the cooling efficiency of the stator 2, and ensuring the reliability of the motor. The first liquid outlet is connected to the second cooling medium channel so that the cooling medium entering the channel 30 can enter the second cooling medium channel.

[0518] In some embodiments of this disclosure, a cooling medium outlet channel is disposed on an end plate 11. The cooling medium outlet channel includes a second liquid outlet, a third connecting port, and a fourth connecting port. The second liquid outlet is used to communicate with an external cooling device. The third connecting port and the fourth connecting port are arranged radially apart along the stator 2. The third connecting port communicates with the second sub-cooling chamber 512, and the fourth connecting port communicates with the fourth sub-cooling chamber 522.

[0519] In some embodiments of this disclosure, the second liquid outlet is connected to an external circulating cooling device to realize the circulation of the cooling medium, which facilitates continuous cooling of the stator 2, improves the cooling efficiency of the stator 2, and thus helps to improve the reliability of the motor operation.

[0520] Furthermore, since the third connecting port is connected to the second sub-cooling chamber 512 and the fourth connecting port is connected to the fourth sub-cooling chamber 522, the cooling medium in the second sub-cooling chamber 512 can flow out through the third connecting port, and the cooling medium in the fourth sub-cooling chamber 522 can flow out through the fourth connecting port.

[0521] In some embodiments, the cooling medium inlet channel 30 is a liquid inlet, and / or the cooling medium outlet channel 12 is a liquid outlet.

[0522] In some embodiments of this disclosure, the cooling medium inlet channel 30 can be configured as a liquid inlet, and / or the cooling medium outlet channel 12 can be configured as a liquid outlet. This further simplifies the structure of the cooling medium inlet channel 30 and the cooling medium outlet channel 12, and reduces the processing difficulty of the housing 1.

[0523] In some embodiments, two liquid inlets may be provided: one liquid inlet is opened on the first side plate 12 to communicate with the first sub-cooling chamber 511, and the other liquid inlet is opened on the end plate 11 to communicate with the third sub-cooling chamber 521. Two liquid outlets may also be provided: one liquid outlet is opened on the end plate 11 and communicates with the second sub-cooling chamber 512, and the other liquid outlet is opened on the end plate 11 and communicates with the fourth sub-cooling chamber 522.

[0524] This disclosure provides a stator cooling structure in some embodiments. The stator cooling structure includes a housing, which is formed by at least a portion of the stator enclosing a cooling chamber. The housing is provided with a first cooling medium channel, and the stator is provided with a second cooling medium channel. The first cooling medium channel communicates with the cooling chamber through the second cooling medium channel.

[0525] The stator cooling structure disclosed in some embodiments of this disclosure forms a cooling chamber by at least partially enclosing a housing and a stator. The housing is provided with a first cooling medium channel, and the stator is provided with a second cooling medium channel. The first cooling medium channel communicates with the cooling chamber through the second cooling medium channel. The cooling medium can cool the stator core of the stator from the first cooling medium channel and the second cooling medium channel, and then enter the cooling chamber from the second cooling medium channel to cool the stator windings of the stator, thereby improving the cooling efficiency of the stator.

[0526] This disclosure also discloses a stator, which includes the stator cooling structure described in the above embodiments.

[0527] It should be noted that the stator cooling structure included in some embodiments of this disclosure is the same as the stator cooling structure described in the above embodiments, and its beneficial effects are also similar. Therefore, it will not be repeated here.

[0528] In some embodiments, the stator 2 disclosed in this disclosure includes a stator core 21; a stator winding 22 wound around the stator core 21, with the stator winding 22 at least partially protruding radially outward from the stator core 21 to form a first end winding 221, and the stator winding 22 at least partially protruding radially inward from the stator core 21 to form a second end winding 222; and a cooling chamber 4 for cooling the first end winding 221 and / or the second end winding 222.

[0529] As shown in Figures 45 and 46, in some embodiments of this disclosure, the stator 2 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. Along the radial direction of the stator 2, the stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221. It is understood that the first end winding 221 is wound on the outer side of the stator core 21. Along the radial direction of the stator 2, the stator winding 22 at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. It is understood that the second end winding 222 is wound on the inner side of the stator core 21. This allows the first end winding 221 to be located within the first cooling chamber 41, allowing the cooling medium to contact the first end winding 221 and exchange heat with it, thereby reducing the temperature of the first end winding 221 and improving the cooling efficiency of the stator 2. The second end winding 222 can be located in the second cooling chamber 42, and the cooling medium can contact the second end winding 222 to exchange heat with the second end winding 222, thereby reducing the temperature of the second end winding 222 and improving the cooling efficiency of the stator 2.

[0530] In some embodiments of this disclosure, the housing 1 includes a first side plate 12 surrounding the stator core 21, and a mounting cavity 16 is provided on the side of the first side plate 12 facing away from the stator core 21; the stator 2 also includes a junction box disposed in the mounting cavity 16, and the junction box is used for electrical connection with the stator winding 22.

[0531] In some embodiments of this disclosure, a mounting cavity 16 is provided on the side of the first side plate 12 opposite to the stator core 21, and a junction box is disposed in the mounting cavity 16 to facilitate electrical connection between the junction box and the stator winding 22. In some embodiments, the above arrangement can also reduce the axial dimension of the stator 2, which is beneficial for the miniaturization of the motor.

[0532] This disclosure also discloses an electric motor in some embodiments, the electric motor including a rotating shaft 7, a rotor 6 and a stator 2 as described in the above embodiments; the rotor 6 and the stator 2 are spaced apart axially on the rotating shaft 7; the rotating shaft 7 passes through the rotor 6 and the stator 2, the rotating shaft 7 is fixedly connected to the rotor 6 and rotatably connected to the stator 2, so that the rotating shaft 7 can rotate relative to the stator 2.

[0533] The motor disclosed in some embodiments of this invention includes a rotor 6, a shaft 7, and a stator 2 as described in the above embodiments. The rotor 6 is disposed within a housing 1, and the rotor 6 and stator 2 are spaced apart axially along the shaft 7. The shaft 7 passes through the stator 2 and rotor 6 along the axial direction of the stator 2, and is fixedly connected to the rotor 6 and rotatably connected to the stator 2, allowing the rotor 6 to rotate relative to the stator 2. Thus, during motor operation, the electromagnetic interaction between the stator 2 and rotor 6 drives the rotor 6 to rotate and output power. By spaced the rotor 6 and stator 2, i.e., by creating a certain gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance losses, which is beneficial for improving the energy conversion efficiency and output power of the motor.

[0534] In some embodiments of this disclosure, there are two stators 2, which are disposed on opposite sides of the rotor 6 along the axial direction.

[0535] It should be noted that the accompanying drawings in some embodiments of this disclosure only show the case where the motor includes two stators 2 and a single rotor 6. In practical applications, the motor in some embodiments of this disclosure may also include a single stator 2 and a single rotor 6. Alternatively, the motor may also include N stators 2 and (N-1) rotors 6, where N > 2. In some embodiments of this disclosure, no excessive limitations are imposed, and in practical applications, those skilled in the art can configure it as needed.

[0536] This disclosure also discloses a powertrain in some embodiments, which includes the electric motor described in any of the above embodiments. The powertrain can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc.

[0537] It should be noted that in some embodiments of this disclosure, the structure of the motor is the same as that of the motor in any of the above embodiments, and its beneficial effects are similar, so it will not be described again here.

[0538] Some embodiments of this disclosure also provide a vehicle that includes the powertrain described in any of the foregoing embodiments, or the electric motor described in any of the foregoing embodiments.

[0539] It should be noted that in some embodiments of this disclosure, the structure of the powertrain is the same as that of the powertrain described in any of the above embodiments, and the structure of the motor is the same as that of the motor described in any of the above embodiments. Of course, the beneficial effects are similar, and will not be elaborated upon here.

[0540] It should be noted that the vehicles in some embodiments of this disclosure can be gasoline-powered vehicles, hybrid vehicles, or pure electric vehicles. This disclosure does not impose excessive restrictions on the type of vehicle. In practical applications, those skilled in the art can configure the vehicle as needed.

[0541] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0542] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0543] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0544] The above description is merely a preferred embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A stator cooling structure configured to cool a stator, wherein, The stator cooling structure includes: A housing configured to house the stator, the housing and the stator enclosing each other to form at least one cooling chamber.

2. The stator cooling structure according to claim 1, wherein, The housing is provided with a cooling medium channel; the stator cooling structure further includes: A cooling assembly, wherein the cooling medium channel is connected to the cooling chamber through the cooling assembly.

3. The stator cooling structure according to claim 2, wherein, The cooling chamber includes a first cooling chamber and a second cooling chamber along the radial direction of the stator. The first cooling chamber is located outside the second cooling chamber. The first cooling chamber is configured to cool the radially outer side of the stator, and the second cooling chamber is configured to cool the radially inner side of the stator.

4. The stator cooling structure according to claim 3, wherein, The cooling assembly includes a first cooling assembly and a second cooling assembly, which are arranged radially apart along the stator. The first cooling component is disposed within the first cooling chamber, and the first cooling component connects the cooling medium channel and the first cooling chamber; The second cooling component is disposed in the second cooling chamber, and the second cooling component connects the cooling medium channel and the second cooling chamber.

5. The stator cooling structure according to claim 4, wherein, The first cooling assembly includes at least one first spray pipe, which is arranged around the axis of the stator, and the first spray pipe is provided with at least one first spray port communicating with the first cooling chamber.

6. The stator cooling structure according to claim 5, wherein, The second cooling assembly includes at least one second liquid spray pipe, which is arranged around the axis of the stator, and has at least one second liquid spray port communicating with the second cooling chamber.

7. The stator cooling structure according to claim 6, satisfying at least one of the following: The at least one first injection pipe includes at least two first injection pipes, the at least two first injection pipes being spaced apart along the axial direction of the stator; and The at least one second spray pipe includes at least two second spray pipes, which are spaced apart along the axial direction of the stator.

8. The stator cooling structure according to claim 6 or 7, satisfying at least one of the following: The at least one first spray nozzle includes a plurality of first spray nozzles, the plurality of first spray nozzles being arranged at circumferential intervals along the first spray pipe; and The at least one second spray nozzle includes a plurality of second spray nozzles, which are spaced apart circumferentially along the second spray pipe.

9. The stator cooling structure according to any one of claims 4 to 8, wherein, The second cooling assembly includes a second flow guide ring that divides the second cooling chamber into a second outer chamber and a second inner chamber. The second outer chamber is in communication with the cooling medium channel, and the second inner chamber is configured to cool the radially inner side of the stator. The second guide ring is provided with at least one second guide hole, which connects the second outer chamber and the second inner chamber.

10. The stator cooling structure according to claim 9, wherein, The second guide ring extends axially along the stator, such that the second outer chamber and the second inner chamber are radially spaced apart along the stator; or The second guide ring extends radially along the stator so that the second outer chamber and the second inner chamber are spaced apart along the axial direction of the stator.

11. The stator cooling structure according to claim 9 or 10, wherein, The at least one second guide hole includes a plurality of second guide holes, and the plurality of second guide holes satisfy at least one of the following: The plurality of second guide holes are arranged at intervals along the circumference of the second guide ring; The plurality of second guide holes are spaced apart along the axial direction of the second guide ring; and The plurality of second guide holes are arranged at radial intervals along the second guide ring.

12. The stator cooling structure according to any one of claims 4 to 11, wherein, The first cooling assembly includes a first guide ring that divides the first cooling chamber into a first outer chamber and a first inner chamber. The first outer chamber is in communication with the cooling medium channel, and the first inner chamber is configured to cool the radially inner side of the stator. The first guide ring is provided with at least one first guide hole, which connects the first outer chamber and the first inner chamber.

13. The stator cooling structure according to claim 12, wherein, The first guide ring extends axially along the stator, such that the first outer chamber and the first inner chamber are radially spaced apart along the stator; or The first guide ring extends radially along the stator so that the first outer chamber and the first inner chamber are spaced apart along the axial direction of the stator.

14. The stator cooling structure according to claim 12, wherein, The at least one first guide hole includes a plurality of first guide holes, and the plurality of first guide holes satisfy at least one of the following: The plurality of first guide holes are arranged at circumferential intervals along the first guide ring; The plurality of first guide holes are spaced apart along the axial direction of the first guide ring; and The plurality of first guide holes are arranged at radial intervals along the first guide ring.

15. The stator cooling structure according to any one of claims 4 to 14, further comprising a seal disposed within the housing, the seal, the housing, and the stator enclosing to form the first cooling chamber and the second cooling chamber.

16. The stator cooling structure according to claim 15, wherein, The sealing element includes a first sealing part and a second sealing part connected to each other. The first sealing part, the housing and the stator enclose the first cooling chamber, and the first sealing part, the second sealing part, the housing and the stator enclose the second cooling chamber.

17. The stator cooling structure according to claim 16, wherein, The first sealing part is an annular structure extending radially along the stator. The outer end of the first sealing part is connected to the housing, and the inner end of the first sealing part is connected to the second sealing part.

18. The stator cooling structure according to claim 17, wherein, The stator includes a stator core and a stator winding wound around the stator core. At least a portion of the stator winding protrudes from the radially outer and radially inner sides of the stator core, forming a first end winding and a second end winding, respectively. The first cooling chamber is configured to accommodate the first end winding and to cool the first end winding; The second cooling chamber is configured to accommodate the second end winding and to cool the second end winding.

19. The stator cooling structure according to claim 17 or 18, wherein, The stator core is provided with at least one mounting groove extending radially along the stator core on the side near the first sealing part, and the mounting groove is configured to mount the stator winding. The first sealing part includes at least one sealing strip, which is adapted to be in a sealing connection with the mounting groove.

20. The stator cooling structure according to claim 19, wherein, The at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core. The at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the first sealing portion, and one of the plurality of sealing strips is embedded in one of the plurality of mounting grooves.

21. The stator cooling structure according to any one of claims 16 to 20, wherein, The second sealing part is a hollow cylindrical structure extending along the axial direction of the stator; Along the axial direction of the stator, one end of the second sealing part is connected to the inner end of the first sealing part, and the other end of the second sealing part is connected to the housing.

22. The stator cooling structure according to any one of claims 16 to 21, wherein, The first sealing part and the second sealing part together form an integral molded structure.

23. The stator cooling structure according to any one of claims 15 to 22 further includes a first sealing ring disposed between the seal and the housing to achieve a sealing connection between the seal and the housing.

24. The stator cooling structure according to any one of claims 15 to 23, further comprising a second sealing ring; The first cooling assembly includes a first guide ring connected to the housing, the first guide ring dividing the first cooling chamber into a first inner chamber and a first outer chamber, and a second sealing ring disposed between the first guide ring and the housing to provide a sealed connection between the first guide ring and the housing; or The second cooling assembly includes a second guide ring connected to the housing, the second guide ring dividing the second cooling chamber into a second inner chamber and a second outer chamber, and a second sealing ring disposed between the second guide ring and the housing to provide a sealed connection between the second guide ring and the housing.

25. The stator cooling structure according to claim 24, wherein, The first guide ring is connected to the sealing element, and the first guide ring and the sealing element together form an integrally molded structure; or The second guide ring is connected to the seal, and the second guide ring and the seal together form an integral structure.

26. The stator cooling structure according to any one of claims 15 to 25, wherein, The housing includes: An end plate, the end plate being disposed on the side of the stator away from the seal; and A side plate extends along the axial direction of the stator, and one end of the side plate is connected to the outer peripheral end of the end plate; The end plate, the side plate, the seal, and the outer radial side of the stator form the first cooling chamber, and the end plate, the seal, and the inner radial side of the stator form the second cooling chamber.

27. The stator cooling structure according to claim 26, wherein, The cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel; The cooling medium inlet channel is connected to the first cooling chamber and the second cooling chamber, respectively; The cooling medium outflow channel is connected to the first cooling chamber and the second cooling chamber, respectively.

28. The stator cooling structure according to claim 27, wherein, The cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: The cooling medium inlet channel is provided in at least one of the end plate and the side plate; and The cooling medium outflow channel is provided in at least one of the end plate and the side plate.

29. The stator cooling structure according to claim 27 or 28, wherein, The cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port; The liquid inlet is configured to communicate with an external cooling device; The first communication port and the second communication port are arranged radially apart along the stator. The first communication port is connected to the first cooling chamber through the first cooling component, and the second communication port is connected to the second cooling chamber through the second cooling component.

30. The stator cooling structure according to claim 29, wherein, The cooling medium inlet channel includes multiple sub-inlet channels, which are in the form of straight segments. Each sub-inlet channel intersects with and is connected to at least one other sub-inlet channel. Of the plurality of sub-entry channels, one end of a portion of the sub-entry channels is located at the outer peripheral end of the end plate and is closed, while one end of the remaining portion of the sub-entry channels is located at the outer peripheral end of the end plate and forms the liquid inlet. The at least one sub-entry channel is provided with the first connection port, and the at least one sub-entry channel is provided with the second connection port.

31. The stator cooling structure according to any one of claims 27 to 30, wherein, The cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes: a liquid outlet, a third connecting port and a fourth connecting port; The liquid outlet is configured to communicate with an external cooling device; The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first cooling chamber, and the fourth communication port communicates with the second cooling chamber.

32. The stator cooling structure according to claim 31, wherein, The cooling medium outflow channel has a groove-shaped structure, and the groove-shaped structure extends radially along the stator; Along the radial direction of the stator, the stator blocks the middle part of the slot of the cooling medium outflow channel, and the two ends of the slot of the cooling medium outflow channel are the third connecting port and the fourth connecting port, respectively.

33. The stator cooling structure according to any one of claims 27 to 32, wherein, The cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: The cooling medium inlet channel is a liquid inlet; and The cooling medium outflow channel is a liquid outlet.

34. The stator cooling structure according to claim 1, further comprising: A cooling assembly that divides the cooling chamber into an outer chamber and an inner chamber, wherein a cooling medium can enter the inner chamber from the outer chamber.

35. The stator cooling structure according to claim 34, wherein, The at least one cooling chamber includes two cooling chambers, which are arranged radially spaced apart along the stator. The outermost of the two cooling chambers is the first cooling chamber, which is configured to cool the radially outer side of the stator. The innermost of the two cooling chambers is the second cooling chamber, which is configured to cool the radially inner side of the stator.

36. The stator cooling structure according to claim 35 further includes a sealing element disposed within the housing, the sealing element, the housing, and the stator forming the first cooling chamber and the second cooling chamber.

37. The stator cooling structure according to claim 36, wherein, The stator includes a stator core and a stator winding wound around the stator core. At least a portion of the stator winding protrudes from the radially outer and radially inner sides of the stator core, forming a first end winding and a second end winding, respectively. The first cooling chamber is configured to accommodate the first end winding so that the cooling medium entering the first cooling chamber contacts the first end winding for heat exchange; The second cooling chamber is configured to accommodate the second end winding so that the cooling medium entering the second cooling chamber contacts the second end winding for heat exchange.

38. The stator cooling structure according to claim 37, wherein, The sealing element includes a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are arranged radially apart along the stator and are located outside the second sealing ring; The first sealing ring, together with the housing and the stator, forms the first cooling chamber, and the second sealing ring, together with the housing and the stator, forms the second cooling chamber.

39. The stator cooling structure according to claim 38, wherein, The sealing element further includes a sealing portion disposed between the first sealing ring and the second sealing ring, and connected to both the first sealing ring and the second sealing ring respectively.

40. The stator cooling structure according to claim 39, wherein, The stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, and the mounting groove is configured to mount the stator winding; The sealing part is at least one sealing strip, which is adapted to be sealed to the mounting groove.

41. The stator cooling structure according to claim 40, wherein, The at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core. The at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the sealing element, and one of the plurality of sealing strips is embedded in one of the plurality of mounting grooves.

42. The stator cooling structure according to claim 40 or 41, wherein, The first sealing ring, the second sealing ring, and the sealing strip together form an integral molded structure.

43. The stator cooling structure according to any one of claims 36 to 42, wherein, The sealing element and the cooling assembly together form an integral molded structure.

44. The stator cooling structure according to any one of claims 36 to 43, wherein, The stator cooling structure further includes a first sealing ring, which is disposed between the sealing element and the housing to make the sealing element and the housing sealed together.

45. The stator cooling structure according to any one of claims 36 to 44, wherein, The stator cooling structure further includes a second sealing ring, which is disposed between the cooling component and the housing to ensure a sealed connection between the cooling component and the housing.

46. ​​The stator cooling structure according to any one of claims 36 to 45, wherein, The cooling assembly includes a first cooling element and a second cooling element arranged radially spaced along the stator; The first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and the cooling medium can enter the first inner chamber from the first outer chamber; The second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and the cooling medium can enter the second inner chamber from the second outer chamber.

47. The stator cooling structure according to claim 46, wherein, The cooling medium pressure in the first outer chamber is greater than the cooling medium pressure in the first inner chamber, and the cooling medium pressure in the second outer chamber is greater than the cooling medium pressure in the second inner chamber.

48. The stator cooling structure according to claim 46 or 47, wherein, The first cooling element is a first spray ring, which is provided with at least one first spray hole, and the first spray hole is configured to spray the cooling medium of the first outer chamber into the first inner chamber.

49. The stator cooling structure according to claim 48, wherein, The at least one first spray hole includes a plurality of first spray holes, which are spaced apart along at least one of the circumferential and axial directions of the first spray ring.

50. The stator cooling structure according to claim 48, wherein, The first spray ring extends along the axial direction of the stator so that the first outer chamber and the first inner chamber are distributed radially apart along the stator.

51. The stator cooling structure according to any one of claims 46 to 50, wherein, The second cooling element is at least one second spray ring, the second spray ring is provided with a second spray hole, the second spray hole is configured to spray the cooling medium of the second outer chamber into the second inner chamber.

52. The stator cooling structure according to claim 51, wherein, The at least one second spray ring includes a plurality of second spray holes, which are spaced apart along at least one of the circumferential and axial directions of the second spray ring.

53. The stator cooling structure according to claim 51 or 52, wherein, The second spray ring extends along the axial direction of the stator so that the second outer chamber and the second inner chamber are distributed radially apart along the stator.

54. The stator cooling structure according to any one of claims 46 to 53, wherein, The housing includes: an end plate, a first side plate, and a second side plate; The end plate is disposed at the end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; The end plate, the first side plate, the seal, and the stator together form the first cooling chamber, and the end plate, the second side plate, the seal, and the stator together form the second cooling chamber.

55. The stator cooling structure according to claim 54, wherein, The housing is provided with a cooling medium channel, which is connected to the first cooling chamber and the second cooling chamber respectively.

56. The stator cooling structure according to claim 55, wherein, The cooling medium channel includes an inlet channel and an outlet channel. The inlet channel is connected to the first outer chamber and the second outer chamber, respectively, and the outlet channel is connected to the first inner chamber and the second inner chamber, respectively.

57. The stator cooling structure according to claim 56, wherein, The inlet channel and the outlet channel satisfy at least one of the following: The liquid inlet channel is disposed in at least one of the end plate and the first side plate; and The liquid outlet channel is provided in at least one of the end plate and the first side plate.

58. The stator cooling structure according to claim 57, wherein, The liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port; The liquid inlet is configured to communicate with an external cooling device; The first communication port and the second communication port are arranged radially apart along the stator. The first communication port communicates with the first outer cavity, and the second communication port communicates with the second outer cavity.

59. The stator cooling structure according to claim 57 or 58, wherein, The liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel; The first liquid inlet channel is connected to the first outer chamber; The second liquid inlet channel is connected to the second outer chamber.

60. The stator cooling structure according to claim 59, wherein, The first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

61. The stator cooling structure according to any one of claims 56 to 60, wherein, The liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port; The liquid outlet is configured to communicate with an external cooling device; The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first inner cavity, and the fourth communication port communicates with the second inner cavity.

62. The stator cooling structure according to any one of claims 57 to 61, wherein, The inlet channel and the outlet channel satisfy at least one of the following: The liquid inlet channel is a liquid inlet hole; and The liquid outlet channel is a liquid outlet hole.

63. The stator cooling structure according to claim 1, wherein, The housing is provided with a cooling medium channel, which is connected to the cooling chamber to cool the stator.

64. The stator cooling structure according to claim 63, wherein, The cooling chamber includes a first cooling chamber and a second cooling chamber; The first cooling chamber and the second cooling chamber are arranged radially apart from each other along the stator and are located outside the second cooling chamber. The first cooling chamber is configured to cool the radially outer side of the stator, and the second cooling chamber is configured to cool the radially inner side of the stator.

65. The stator cooling structure according to claim 64 further includes a cooling assembly, the cooling assembly comprising a first cooling element and a second cooling element disposed radially spaced along the stator; The first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and the cooling medium can enter the first inner chamber from the first outer chamber; The second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and the cooling medium can enter the second inner chamber from the second outer chamber.

66. The stator cooling structure according to claim 65, wherein, The stator includes a stator core and a stator winding wound around the stator core. At least a portion of the stator winding protrudes from the radially outer and radially inner sides of the stator core, forming a first end winding and a second end winding, respectively. The first inner chamber is configured to accommodate the first end winding so that the cooling medium entering the first inner chamber contacts the first end winding for heat exchange. The second inner chamber is configured to accommodate the second end winding so that the cooling medium entering the second inner chamber contacts the second end winding for heat exchange.

67. The stator cooling structure according to claim 66, wherein, The cooling medium pressure in the first outer chamber is greater than the cooling medium pressure in the first inner chamber, and the cooling medium pressure in the second outer chamber is greater than the cooling medium pressure in the second inner chamber.

68. The stator cooling structure according to any one of claims 65 to 67, wherein, The first cooling element is a first spray ring, which is provided with at least one first spray hole, and the first spray hole is configured to spray the cooling medium of the first outer chamber into the first inner chamber.

69. The stator cooling structure according to claim 68, wherein, The at least one first spray hole includes a plurality of first spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the first spray ring.

70. The stator cooling structure according to claim 69, wherein, The second cooling element is a second spray ring, which is provided with at least one second spray hole, and the second spray hole is configured to spray the cooling medium of the second outer chamber into the second inner chamber.

71. The stator cooling structure according to claim 70, wherein, The at least one second injection hole includes a plurality of second injection holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the second injection ring.

72. The stator cooling structure according to claim 70 or 71, wherein, The first spray ring extends radially along the stator, such that the first outer chamber and the first inner chamber are spaced apart along the axial direction of the stator; The second spray ring extends radially along the stator so that the second outer chamber and the second inner chamber are spaced apart along the axial direction of the stator.

73. The stator cooling structure according to claim 70 or 71, wherein, The first spray ring extends radially along the stator, such that the first outer chamber and the first inner chamber are spaced apart along the axial direction of the stator; The second spray ring extends along the axial direction of the stator so that the second outer chamber and the second inner chamber are distributed radially apart along the stator.

74. The stator cooling structure according to claim 70 or 71, wherein, The first liquid spraying ring extends along the axial direction of the stator, such that the first outer chamber and the first inner chamber are distributed at a radial distance along the stator; The second spray ring extends radially along the stator so that the second outer chamber and the second inner chamber are spaced apart along the axial direction of the stator.

75. The stator cooling structure according to any one of claims 65 to 74, further comprising a second sealing ring disposed between the cooling assembly and the housing, so as to provide a sealed connection between the cooling assembly and the housing.

76. The stator cooling structure according to any one of claims 66 to 74, further comprising a seal, the seal and the housing and the stator enclosing to form the first cooling chamber and the second cooling chamber.

77. The stator cooling structure according to claim 76, wherein, The sealing element includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being arranged radially apart along the stator and located outside the second sealing ring; The first sealing ring, together with the housing and the stator, forms the first cooling chamber, and the second sealing ring, together with the housing and the stator, forms the second cooling chamber.

78. The stator cooling structure according to claim 77, wherein, The sealing element further includes a sealing portion disposed between the first sealing ring and the second sealing ring, and connected to both the first sealing ring and the second sealing ring respectively.

79. The stator cooling structure according to claim 78, wherein, The stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, and the mounting groove is configured to mount the stator winding; The sealing part is at least one sealing strip, which is adapted to be sealed to the mounting groove.

80. The stator cooling structure according to claim 79, wherein, The at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core. The at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the sealing element, and one of the plurality of sealing strips is embedded in one of the plurality of mounting grooves.

81. The stator cooling structure according to claim 79 or 80, wherein, The first sealing ring, the second sealing ring, and the sealing strip together form an integral molded structure.

82. The stator cooling structure according to any one of claims 76 to 81, wherein, The sealing element and the cooling assembly together form an integral molded structure.

83. The stator cooling structure according to any one of claims 76 to 82 further includes a first sealing ring disposed between the sealing member and the housing, so as to seal the sealing member and the housing.

84. The stator cooling structure according to any one of claims 76 to 83, wherein, The housing includes: an end plate, a first side plate, and a second side plate; The end plate is disposed at the end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; The end plate, the first side plate, the seal, and the stator together form the first cooling chamber, and the end plate, the second side plate, the seal, and the stator together form the second cooling chamber.

85. The stator cooling structure according to claim 84, wherein, The cooling medium channel includes an inlet channel and an outlet channel. The inlet channel is connected to the first outer chamber and the second outer chamber, respectively, and the outlet channel is connected to the first inner chamber and the second inner chamber, respectively.

86. The stator cooling structure according to claim 85, wherein, The inlet channel and the outlet channel satisfy at least one of the following: The liquid inlet channel is disposed in at least one of the end plate and the first side plate; and The liquid outlet channel is provided in at least one of the end plate and the first side plate.

87. The stator cooling structure according to claim 86, wherein, The liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port; The liquid inlet is configured to communicate with an external cooling device; The first communication port and the second communication port are arranged radially apart along the stator. The first communication port communicates with the first outer cavity, and the second communication port communicates with the second outer cavity.

88. The stator cooling structure according to claim 86 or 87, wherein, The liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel; The first liquid inlet channel is connected to the first outer chamber; The second liquid inlet channel is connected to the second outer chamber.

89. The stator cooling structure according to claim 88, wherein, The first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

90. The stator cooling structure according to any one of claims 85 to 89, wherein, The liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port; The liquid outlet is configured to communicate with an external cooling device; The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first inner cavity, and the fourth communication port communicates with the second inner cavity.

91. The stator cooling structure according to any one of claims 86 to 90, wherein, The inlet channel and the outlet channel satisfy at least one of the following: The liquid inlet channel is a liquid inlet hole, and The liquid outlet channel is a liquid outlet hole.

92. The stator cooling structure according to claim 1, wherein, The housing is provided with a first cooling medium channel, and the stator is provided with a second cooling medium channel. The first cooling medium channel is connected to the cooling chamber through the second cooling medium channel.

93. The stator cooling structure according to claim 92, wherein, The second cooling medium channel is disposed in the stator core of the stator, and the cooling medium in the second cooling medium channel is used to cool one side of the stator core.

94. The stator cooling structure according to claim 93, wherein, The second cooling medium channel includes at least one first sub-cooling medium channel, which extends radially along the stator and communicates with the first cooling medium channel and the cooling chamber.

95. The stator cooling structure according to claim 94, wherein, The at least one first sub-cooling medium channel includes a plurality of first sub-cooling medium channels, which are arranged at intervals along the circumference of the stator.

96. The stator cooling structure according to claim 95, wherein, The second cooling medium channel further includes at least one second sub-cooling medium channel. The second sub-cooling medium channel extends circumferentially along the stator and is connected to the first sub-cooling medium channel and the first cooling medium channel, so that the cooling medium in the first cooling medium channel can enter the first sub-cooling medium channel through the second sub-cooling medium channel.

97. The stator cooling structure according to claim 96, wherein, The at least one second sub-cooling medium channel includes a plurality of second sub-cooling medium channels, which are arranged at radial intervals along the stator.

98. The stator cooling structure according to claim 96 or 97, wherein, The first sub-cooling medium channel and the second sub-cooling medium channel are respectively disposed in the stator core of the stator.

99. The stator cooling structure according to any one of claims 93-98, wherein, The cooling chamber includes a first cooling chamber and a second cooling chamber, and the first cooling chamber and the second cooling chamber are respectively connected to the first sub-cooling medium channel; Along the radial direction of the stator, the first cooling chamber and the second cooling chamber are spaced apart, and the first cooling chamber is located outside the second cooling chamber; The first cooling chamber is configured to cool the radially outer side of the stator, and the second cooling chamber is configured to cool the radially inner side of the stator.

100. The stator cooling structure according to claim 99, further comprising: A cooling assembly is disposed in at least one of the first cooling chamber and the second cooling chamber, and the cooling assembly can communicate the first cooling medium channel and the second cooling medium channel.

101. The stator cooling structure according to claim 100, wherein, The cooling assembly includes a first cooling element and a second cooling element, which are spaced apart along the radial direction of the stator. The first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first sub-cooling chamber and a second sub-cooling chamber, and the cooling medium can enter the second sub-cooling chamber from the first sub-cooling chamber; The second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a third sub-cooling chamber and a fourth sub-cooling chamber, and the cooling medium can enter the fourth sub-cooling chamber from the third sub-cooling chamber; The first sub-cooling chamber and the third sub-cooling chamber are respectively connected to the first sub-cooling medium channel.

102. The stator cooling structure according to claim 101, wherein, At least a portion of the stator winding protrudes radially outward from the stator core to form a first end winding, and at least a portion of the stator winding protrudes radially inward from the stator core to form a second end winding. The second sub-cooling chamber is configured to accommodate the first end winding so that the cooling medium contacts the first end winding for heat exchange, and the third sub-cooling chamber is configured to accommodate the second end winding so that the cooling medium contacts the second end winding for heat exchange.

103. The stator cooling structure according to claim 101 or 102, wherein, The pressure of the cooling medium in the first sub-cooling chamber is greater than the pressure of the cooling medium in the second sub-cooling chamber; The pressure of the cooling medium in the third sub-cooling chamber is greater than the pressure of the cooling medium in the fourth sub-cooling chamber.

104. The stator cooling structure according to any one of claims 101 to 103, wherein, The first cooling component includes a first spray ring, on which at least one first spray hole is provided. The first spray hole is configured to spray the cooling medium of the first sub-cooling chamber into the second sub-cooling chamber.

105. The stator cooling structure according to claim 104, wherein, The at least one first spray hole includes a plurality of first spray holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the first spray ring.

106. The stator cooling structure according to claim 104, wherein, The second cooling component includes a second spray ring, which is provided with at least one second spray hole configured to spray the cooling medium of the third sub-cooling chamber into the fourth sub-cooling chamber.

107. The stator cooling structure according to claim 106, wherein, The at least one second injection hole includes a plurality of second injection holes, which are spaced apart along at least one of the circumferential, axial and radial directions of the second injection ring.

108. The stator cooling structure according to claim 106 or 107, wherein, The first liquid spray ring extends radially along the stator, such that the first sub-cooling chamber and the second sub-cooling chamber are spaced apart along the axial direction of the stator; The second liquid spray ring extends radially along the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are spaced apart along the axial direction of the stator.

109. The stator cooling structure according to claim 106 or 107, wherein, The first liquid spray ring extends radially along the stator, such that the first sub-cooling chamber and the second sub-cooling chamber are spaced apart along the axial direction of the stator; The second liquid spray ring extends along the axial direction of the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are distributed radially spaced along the stator.

110. The stator cooling structure according to claim 106 or 107, wherein, The first liquid spray ring extends along the axial direction of the stator, such that the first sub-cooling chamber and the second sub-cooling chamber are distributed radially spaced along the stator; The second liquid spray ring extends radially along the stator so that the third and fourth sub-cooling chambers are spaced apart axially along the stator.

111. The stator cooling structure according to claim 106 or 107, wherein, The first liquid spray ring extends along the axial direction of the stator, such that the first sub-cooling chamber and the second sub-cooling chamber are distributed radially spaced along the stator; The second liquid spray ring extends along the axial direction of the stator so that the third sub-cooling chamber and the fourth sub-cooling chamber are distributed radially apart along the stator.

112. The stator cooling structure according to any one of claims 100 to 111 further includes a second sealing ring disposed between the cooling assembly and the housing to provide a sealed connection between the cooling assembly and the housing.

113. The stator cooling structure according to any one of claims 100 to 112, further comprising: A sealing element, which, together with the housing and the stator, forms the first cooling chamber and the second cooling chamber.

114. The stator cooling structure according to claim 113, wherein, The sealing element includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being arranged radially apart along the stator and located outside the second sealing ring; The first sealing ring, together with the housing and the stator, forms the first cooling chamber; the second sealing ring, together with the housing and the stator, forms the second cooling chamber.

115. The stator cooling structure according to claim 114, wherein, The sealing element also includes a sealing portion. The sealing part is disposed between the first sealing ring and the second sealing ring, and is connected to the first sealing ring and the second sealing ring respectively.

116. The stator cooling structure according to claim 115, wherein, The stator core is provided with at least one mounting groove extending radially along the stator core on the side near the sealing portion, and the mounting groove is configured to mount the stator winding; The sealing part is at least one sealing strip, which is adapted to be sealed to the mounting groove.

117. The stator cooling structure according to claim 116, wherein, The at least one mounting slot includes a plurality of mounting slots, which are spaced apart circumferentially along the stator core. The at least one sealing strip includes a plurality of sealing strips, which are spaced apart circumferentially along the sealing element, and one of the plurality of sealing strips is embedded in one of the plurality of mounting grooves.

118. The stator cooling structure according to claim 116 or 117, wherein, The first sealing ring, the second sealing ring, and the sealing strip together form an integral molded structure.

119. The stator cooling structure according to any one of claims 113 to 118, wherein, The sealing element and the cooling assembly together form an integral molded structure.

120. The stator cooling structure according to any one of claims 113 to 119 further includes a first sealing ring disposed between the sealing member and the housing, so as to seal the sealing member and the housing.

121. The stator cooling structure according to any one of claims 113 to 120, wherein, The housing includes an end plate, a first side plate, and a second side plate; The end plate is disposed at the end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate; The end plate, the first side plate, the seal, and the stator together form the first cooling chamber, and the end plate, the second side plate, the seal, and the stator together form the second cooling chamber.

122. The stator cooling structure according to claim 121, wherein, The first cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel. The cooling medium inlet channel is connected to the first sub-cooling chamber and the third sub-cooling chamber respectively through the second cooling medium channel, and the cooling medium outlet channel is connected to the second sub-cooling chamber and the fourth sub-cooling chamber respectively.

123. The stator cooling structure according to claim 122, wherein, The cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: The cooling medium inlet channel is disposed in at least one of the end plate and the first side plate; and The cooling medium outflow channel is provided in at least one of the end plate and the first side plate.

124. The stator cooling structure according to claim 123, wherein, The cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes an inlet and a first outlet. The liquid inlet is configured to communicate with an external cooling device; The first liquid outlet is connected to the second cooling medium channel.

125. The stator cooling structure according to any one of claims 122 to 124, wherein, The cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes a second liquid outlet, a third connecting port, and a fourth connecting port. The second liquid outlet is configured to communicate with an external cooling device; The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the second sub-cooling chamber, and the fourth communication port communicates with the fourth sub-cooling chamber.

126. The stator cooling structure according to any one of claims 122 to 125, wherein, The cooling medium inlet channel and the cooling medium outlet channel satisfy at least one of the following: The cooling medium inlet channel is a liquid inlet hole; and The cooling medium outflow channel is a liquid outlet hole.

127. The stator cooling structure according to any one of claims 1 to 126, for a stator, wherein, The stator includes: Stator core; and A stator winding is wound around the stator core. Along the radial direction of the stator core, the stator winding at least partially protrudes radially outward from the stator core to form a first end winding, and the stator winding at least partially protrudes radially inward from the stator core to form a second end winding. The cooling chamber is configured to cool at least one of the first end winding and the second end winding.

128. The stator cooling structure according to claim 127, wherein, The housing includes a first side plate surrounding the stator core, and a mounting cavity is provided on the side of the first side plate opposite to the stator core; The stator also includes a junction box disposed within the mounting cavity and configured to be electrically connected to the stator windings.

129. An electric motor, wherein, The motor includes a rotating shaft, a rotor, and a stator cooling structure according to claim 127 or 128; The rotor and the stator are spaced apart axially on the shaft. The rotating shaft passes through the rotor and the stator, and is connected to the rotor and rotatably connected to the stator so that the rotating shaft can rotate relative to the stator.

130. The motor according to claim 129, comprising two stators disposed on opposite axial sides of the rotor.

131. The electric motor according to claim 129 or 130, for use in a powertrain.

132. A vehicle comprising an electric motor according to any one of claims 129 to 131.

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