Oil cooling power assembly and electric vehicle

Abstract

The utility model provides an oil cooling power assembly and an electric vehicle. A shell of the oil cooling power assembly comprises a motor groove, an electric control groove and a through hole, the motor groove is used for fixing a stator of a driving motor, the electric control groove is used for containing an electrical assembly of a motor controller, and the through hole is used for penetrating through the groove wall of the electric control groove in the axial direction of the driving motor. The shell is further used for fixing a plastic part, and the plastic part is used for wrapping the first set of copper bars and receiving oil conveyed by the internal flow channel of the shell. The first group of copper bars extend into the electric control groove through the through holes, one end of the first group of copper bars extending into the electric control groove is electrically connected with an electrical assembly of a motor controller, and the other end of the first group of copper bars exposed out of the electric control groove is electrically connected with a stator winding of a stator of a driving motor through the second group of copper bars. And the oil liquid received by the plastic part is used for cooling at least one of the first group of copper bars or the second group of copper bars. And miniaturization of an oil cooling power assembly is facilitated, and the space of an electric vehicle is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric vehicles, in particular to an oil-cooled power assembly and the field of electric vehicles. BACKGROUND

[0002] In the power assembly of an electric vehicle, a three-phase current transmission piece is used to transmit three-phase alternating current between the motor controller and the stator winding of the drive motor. In the prior art, an oil injection structure is arranged in the motor cavity of the power assembly, and the oil injection hole of the oil injection structure is communicated with the oil gallery of the motor end cover, so that the oil injection structure receives the oil transmitted by the oil gallery of the motor end cover and cools the three-phase current transmission piece through the oil injection hole of the oil injection structure. However, the oil injection structure is arranged in the axial direction of the power assembly, which increases the axial size of the motor cavity of the power assembly, resulting in an increase in the overall size of the power assembly, which is not conducive to the miniaturization of the power assembly. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an oil-cooled power assembly and the field of electric vehicles, which can reduce the overall size of the oil-cooled power assembly, which is conducive to the miniaturization of the oil-cooled power assembly, thereby saving space for the electric vehicle.

[0004] In a first aspect, the embodiments of the present application provide an oil-cooled power assembly. The housing of the oil-cooled power assembly includes a motor slot, an electric control slot, and a through hole. The motor slot is used to fix the stator of a drive motor. The electric control slot is used to accommodate the electrical components of a motor controller. The through hole is used to penetrate the slot wall of the electric control slot in the axial direction of the drive motor. The housing is also used to fix a plastic part. The plastic part is used to wrap a first group of copper bars and to receive oil transmitted by the internal flow channel of the housing. The first group of copper bars extends into the electric control slot through the through hole. One end of the first group of copper bars extending into the electric control slot is used to electrically connect the electrical components of the motor controller. The other end of the first group of copper bars exposed from the electric control slot is used to electrically connect the stator winding of the stator of the drive motor through a second group of copper bars. The oil received by the plastic part is used to cool at least one of the first group of copper bars or the second group of copper bars.

[0005] In the oil-cooled power assembly provided by the embodiments of the present application, two groups of copper bars are arranged, and a through hole communicating with the electric control slot is arranged on the housing. The two groups of copper bars are electrically connected. One group of copper bars in the two groups of copper bars is inserted into the electric control slot through the through hole on the housing to electrically connect the electrical components of the motor controller. The other group of copper bars is electrically connected to the stator winding of the stator of the drive motor, thereby realizing the electrical connection between the drive motor and the motor controller in the oil-cooled power assembly.

[0006] The oil-cooled power assembly provided by the embodiments of the present application can cool at least one of the two groups of copper bars by wrapping the first group of copper bars with a plastic part and fixing the plastic part on the shell, so that the oil liquid transmitted by the internal flow channel of the shell can be received by the plastic part to cool at least one of the two groups of copper bars, without the need to set a dedicated oil injection structure in the axial direction, effectively utilizing the structure of the plastic part wrapped outside the first group of copper bars, and achieving electrical isolation of the first group of copper bars and cooling of at least one of the two groups of copper bars, thereby reducing the axial size of the oil-cooled power assembly, and further reducing the overall size of the oil-cooled power assembly, which is conducive to miniaturization of the oil-cooled power assembly.

[0007] In addition, the oil-cooled power assembly provided by the embodiments of the present application can reduce the cost of the oil-cooled power assembly by multiplexing the plastic part, and the first group of copper bars can complete the assembly process of the corresponding cooling system by penetrating the plastic part, which is conducive to simplifying the installation process of the oil-cooled power assembly.

[0008] In one implementation, the shell further includes a liquid outlet hole for receiving the oil liquid through the internal flow channel of the shell, and a plastic part for receiving the oil liquid transmitted by the internal flow channel of the shell through the liquid outlet hole.

[0009] The shell is provided with a liquid outlet hole, and the oil liquid in the internal flow channel of the shell is introduced into the plastic part through the liquid outlet hole of the shell, which is conducive to reducing the complexity of the cooling system of the two groups of copper bars and simplifying the assembly process of the cooling system of the two groups of copper bars.

[0010] In one implementation, the internal flow channel of the shell is used to communicate with the slot wall of a motor slot, and a liquid outlet hole is used to receive the oil liquid in the motor slot through the internal flow channel of the shell. Thus, the excess oil liquid in the motor slot flows into the liquid outlet hole of the shell through the internal flow channel of the shell, which is conducive to improving the utilization rate of the oil liquid and reducing the cost of the oil-cooled power assembly.

[0011] In one implementation, the internal flow channel of the shell is used to communicate with the slot wall of a motor slot, and a liquid outlet hole is used to receive the oil liquid in the motor slot through the internal flow channel of the shell. Thus, the excess oil liquid in the motor slot flows into the liquid outlet hole of the shell through the internal flow channel of the shell, which is conducive to improving the utilization rate of the oil liquid and reducing the cost of the oil-cooled power assembly.

[0012] In one implementation, the slot wall of a motor slot includes a liquid inlet hole, and the internal flow channel of the shell is used to communicate with the slot wall of a motor slot through the liquid inlet hole. Thus, the excess oil liquid in the motor slot flows into the internal flow channel of the shell through the liquid inlet hole on the slot wall of the motor slot, and then flows into the liquid outlet hole of the shell, which is conducive to simplifying the machining process of the oil channel between the motor slot and the liquid outlet hole and reducing the cost of the oil-cooled power assembly.

[0013] In addition, one motor slot is further used for accommodating one oil injection ring, the end of the stator winding of the stator of the drive motor exposed to the stator core of the stator of the drive motor along the axial direction of the drive motor, and the oil injection ring surrounds the end of the stator winding of the stator of the drive motor. Wherein, the distance between the oil injection ring and the slot opening of the motor slot is greater than the distance between the liquid inlet hole and the slot opening of the motor slot and less than the distance between the stator core and the slot opening of the motor slot along the axial direction of the drive motor.

[0014] That is, the liquid inlet hole on the slot wall of the motor slot along the axial direction of the drive motor is arranged between the oil injection ring and the stator core, so that the excess oil between the oil injection ring and the slot wall of the motor slot flows into the internal flow channel of the shell along the liquid inlet hole of the slot wall of the motor slot, which is beneficial to improve the utilization rate of the oil introduced by the stator core to the oil injection ring and reduce the cost of the oil-cooled power assembly. In addition, it is also beneficial to reduce the pressure of the oil between the oil injection ring and the slot wall of the motor slot, and further avoid the failure of the oil injection ring or the motor slot caused by excessive pressure of the oil between the oil injection ring and the slot wall of the motor slot.

[0015] In one implementation, a plastic part includes one liquid inlet and multiple liquid outlets, one liquid inlet is used for receiving the oil output by one liquid outlet, and multiple liquid outlets are used for outputting the oil to cool the second group of copper bars. Therefore, the oil of the liquid outlet hole of the shell flows in along one liquid inlet of the plastic part and flows out along multiple liquid outlets to cool the second group of copper bars, which is further beneficial to reduce the complexity of the cooling oil channel on the plastic part.

[0016] In one implementation, a plastic part includes another surface facing the shell, and the other surface of the plastic part includes a protrusion, the protrusion includes a liquid inlet, and the protrusion is used for embedding a liquid outlet hole. The protrusion of the plastic part is provided with the liquid inlet, and the protrusion of the plastic part is embedded in the liquid outlet hole of the shell, so that the liquid inlet of the plastic part receives the oil output by the liquid outlet hole of the shell, and the installation process of the oil-cooled power assembly is simplified.

[0017] In one implementation, the second group of copper bars includes three copper bars, and each of the three copper bars is used for transmitting one phase of alternating current. A plastic part includes one surface facing the second group of copper bars, and one surface of the plastic part includes three liquid outlets. Wherein, each of the three liquid outlets faces one of the three copper bars, and each of the three liquid outlets is used for outputting oil to cool one of the three copper bars. Therefore, the oil output by each liquid outlet of the plastic part is sprayed on one of the second group of copper bars to cool each of the second group of copper bars, improve the cooling effect of the second group of copper bars, and further improve the performance of the oil-cooled power assembly.

[0018] In an implementation, the plastic part includes two other surfaces, the two other surfaces of the plastic part are arranged opposite to each other along the arrangement direction of the plurality of liquid outlets, and the plastic part further includes a plurality of blocking holes, each of the blocking holes is used for connecting each of the liquid outlets and the two other surfaces of the plastic part, and each of the blocking holes is used for embedding a blocking piece. Thus, the connection of the plurality of liquid outlets is facilitated, and the processing technology of the oil channel of the plastic part is simplified.

[0019] In an implementation, the plastic part further includes a threading hole, the threading hole is used for passing a signal line, the signal line is used for electrically connecting an electrical component of a motor controller and a signal line interface of a resolver sensor, and the signal line interface is used for being fixed to a stator of the resolver sensor. The threading hole reuses the structure of the plastic part, and is conducive to reducing the cost of the oil-cooled power assembly.

[0020] In an implementation, the threading hole is arranged on the side of the three liquid outlets away from the central axis of the driving motor. Thus, the oil output by each of the liquid outlets does not interfere with the signal line.

[0021] In an implementation, the plastic part further includes an internal flow channel, the internal flow channel of the plastic part is used for connecting the liquid inlet and the plurality of liquid outlets, and the oil in the internal flow channel of the plastic part is used for flowing through the first group of copper bars wrapped by the plastic part.

[0022] Part of the oil in the internal flow channel of the plastic part is used for cooling the first group of copper bars, and the other part of the oil is used for flowing into the plurality of liquid outlets to cool the second group of copper bars. Thus, the performance of the oil-cooled power assembly is improved.

[0023] In an implementation, the plastic part further includes a plurality of connecting holes, each of the connecting holes is used for embedding a connecting piece, and each of the connecting pieces is used for electrically connecting one copper bar of the first group of copper bars and one copper bar of the second group of copper bars. Thus, the electrical connection and fixation of the two groups of copper bars are achieved, the two groups of copper bars are prevented from being separated during the driving of the electric vehicle to affect the electrical connection of the two groups of copper bars, and the reliability of the oil-cooled power assembly is improved.

[0024] In an implementation, the plurality of connecting holes are arranged on the side of the plurality of liquid outlets away from the central axis of the driving motor. Thus, the oil output by each of the liquid outlets is directly sprayed on the second group of copper bars, the cooling effect of the second group of copper bars is improved, and the performance of the oil-cooled power assembly is improved.

[0025] In an implementation, the plurality of connecting holes are arranged in an arc. The three winding lead ends of the stator winding of the driving motor are usually arranged in an arc, the second group of copper bars are respectively connected to the first group of copper bars and the three winding lead ends, and the connecting holes for connecting the two groups of copper bars are arranged in an arc. Thus, the connection of the first group of copper bars to the second group of copper bars and the three winding lead ends of the driving motor is facilitated, and the installation of the oil-cooled power assembly is simplified.

[0026] In an implementation form, one motor end cover of the oil-cooled power assembly is used to enclose one motor slot, and one motor end cover is used to accommodate the second group of copper bars. Thus, the space of the motor end cover can be fully utilized, and no space needs to be reserved in the motor slot, thereby reducing the axial dimension of the oil-cooled power assembly.

[0027] In an implementation form, one motor end cover comprises two through holes, one end of the second group of copper bars is exposed from the other end of one electric control slot and passes through one of the two through holes to electrically connect one end of the second group of copper bars, and the other end of the second group of copper bars passes through the other of the two through holes to electrically connect the stator winding of the stator of the drive motor. The two through holes pass through the motor end cover along the axial direction of the drive motor, and the two through holes are arranged along the radial direction of the drive motor. Thus, not only the space of the motor end cover can be fully utilized, but also the length of the second group of copper bars can be reduced.

[0028] In an implementation form, the shell further comprises a plurality of threaded holes, each threaded hole is used to embed a fixing member, and each fixing member is used to fixedly connect a plastic member and the shell. Thus, the displacement of the first group of copper bars during the driving of the electric vehicle is avoided. In addition, the plurality of threaded holes surround the through hole. Thus, the plastic member can enclose the through hole of the integrated shell, thereby avoiding the impurities from the outside to enter the through hole. In turn, the stability of the first group of copper bars is improved, and the reliability of the oil-cooled power assembly is ensured.

[0029] In a second aspect, an electric vehicle is provided, and the electric vehicle comprises wheels, a transmission mechanism, and the oil-cooled power assembly as described in the first aspect and any implementation form of the first aspect, and the oil-cooled power assembly is used to drive the wheels through the transmission mechanism.

[0030] The oil-cooled power assembly provided by the embodiments of the present application realizes miniaturization, thereby being beneficial to saving the space of the electric vehicle, increasing the driving space of the electric vehicle, and improving the driving experience of the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A schematic diagram of the electric vehicle provided by the embodiments of the present application is shown.

[0032] Figure 2 A schematic diagram of the oil-cooled power assembly provided by the embodiments of the present application is shown.

[0033] Figure 3 A schematic diagram of the stator of the drive motor in the oil-cooled power assembly provided by the embodiments of the present application is shown.

[0034] Figure 4 A schematic diagram of the shell of the oil-cooled power assembly provided by the embodiments of the present application is shown.

[0035] Figure 5This is a schematic diagram of an integrated housing for an oil-cooled powertrain provided in an embodiment of this application.

[0036] Figure 6 This is another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application.

[0037] Figure 7 This is a schematic diagram of a three-phase current transmission device provided in an embodiment of this application.

[0038] Figure 8 This is a schematic diagram of an oil-cooled powertrain provided in an embodiment of this application.

[0039] Figure 9 This is a schematic diagram of a plastic part provided in an embodiment of this application.

[0040] Figure 10 This is another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application.

[0041] Figure 11 This is another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application.

[0042] Figure 12 and Figure 13 These are another schematic diagrams of the plastic parts provided in the embodiments of this application.

[0043] Figure 14 This is another schematic diagram of a plastic part provided in an embodiment of this application.

[0044] Figure 15 This is a schematic diagram of a motor end cover provided in an embodiment of this application.

[0045] Figure 16 This is another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application.

[0046] Figure 17 This is another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0048] The terms "equal to" or "equal to" in this application are not strictly equal or equal in the strict sense, but rather within the allowable error range. Similarly, "parallel" is not strictly parallel, but within the allowable error range. And "perpendicular" is not strictly perpendicular, but within the allowable error range.

[0049] In the embodiments of the present application, the same reference signs represent the same component or the same part. In the embodiments of the present application, for a plurality of same parts, only one of the parts may be marked with a reference sign in the drawings. The reference signs are applicable to other same parts or components. In addition, the sizes and the dimensions of the parts shown in the drawings are only exemplary.

[0050] Figure 1 A schematic diagram of an electric vehicle is provided in the embodiments of the present application. The electric vehicle provided in the embodiments of the present application includes a pure electric vehicle, a hybrid electric vehicle, a range extended electric vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc. The pure electric vehicle is also referred to as a pure electric vehicle / battery electric vehicle, or simply a pure EV / battery EV. The hybrid electric vehicle is also referred to as a hybrid electric vehicle, or simply an HEV. The range extended electric vehicle is also referred to as a range extended electric vehicle, or simply an REEV. The plug-in hybrid electric vehicle is also referred to as a plug-in hybrid electric vehicle, or simply a PHEV. The new energy vehicle is also referred to as a new energy vehicle, or simply a NEV.

[0051] As shown in Figure 1 , the electric vehicle 1 includes an oil-cooled power assembly 10 and a power battery 20. The oil-cooled power assembly 10 is configured to receive power supply from the power battery 20 and convert the electric energy into mechanical energy to drive the wheels of the electric vehicle 1.

[0052] In one embodiment, the electric vehicle 1 includes two oil-cooled power assemblies 10. One of the two oil-cooled power assemblies 10 is configured to drive the two front wheels of the electric vehicle 1, and the other of the two oil-cooled power assemblies 10 is configured to drive the two rear wheels of the electric vehicle 1. In one embodiment, the electric vehicle 1 includes four oil-cooled power assemblies 10, and the four oil-cooled power assemblies 10 are configured to drive the four wheels of the electric vehicle 1, respectively.

[0053] As shown in Figure 1 , the electric vehicle 1 further includes a power supply module 40. The power supply module 40 is configured to receive power supply from an external power source 50 and charge the power battery 20. In one embodiment, the external power source 50 is an alternating current power grid, an alternating current charging pile, or a direct current charging pile. The power supply module 40 includes at least one of a direct current charger or an alternating current charger.

[0054] The oil-cooled power assembly provided by the embodiments of the present application further includes a driving motor and a motor controller. In one embodiment, the motor controller is configured to control the driving motor to drive the wheels of the electric vehicle.

[0055] As shown in Figure 1 The oil-cooled power assembly 10 provided by the embodiments of the present application includes a driving motor 100 and a motor controller 200. The driving motor 100 is configured to drive the wheels of the electric vehicle 1. The motor controller 200 is configured to receive the direct current output by the power battery 20, convert the direct current output by the power battery 20 into alternating current, and control the driving motor 100 to drive the wheels of the electric vehicle 1.

[0056] In one embodiment, the oil-cooled power assembly includes a driving motor, a motor controller, and a speed reducer. The motor controller is configured to control the driving motor to drive the wheels of the electric vehicle through the speed reducer.

[0057] The oil-cooled power assembly 10 provided by the embodiments of the present application further includes a speed reducer. The driving motor 100 is configured to drive the wheels of the electric vehicle 1 through the speed reducer. The motor controller 200 is configured to receive the direct current output by the power battery 20, convert the direct current output by the power battery 20 into alternating current, and control the driving motor 100 to drive the wheels of the electric vehicle 1 through the speed reducer.

[0058] In one embodiment, the oil-cooled power assembly provided by the embodiments of the present application further includes a three-phase current transmission member. The motor controller in the power assembly is configured to output three-phase alternating current to the stator winding of the driving motor through the three-phase current transmission member.

[0059] Figure 2 A schematic diagram of the oil-cooled power assembly provided by the embodiments of the present application is shown in Figure 2 The oil-cooled power assembly 10 includes a driving motor 100, a motor controller 200, and a three-phase current transmission member 300. The motor controller 200 is configured to output three-phase alternating current to the driving motor 100 through the three-phase current transmission member 300.

[0060] The driving motor 100 includes a stator 110, a rotor 120, and a motor shaft 130. The rotor 120 is configured to be drivingly connected to the motor shaft 130.

[0061] The electrical components of the motor controller 200 are configured to convert the direct current output by the power battery 20 into alternating current. The electrical components of the motor controller 200 are configured to output three-phase alternating current to the stator winding 112 of the stator 110 through the three-phase current transmission member 300 in sequence, thereby driving the rotor 120 to rotate relative to the stator 110, and driving the motor shaft 130 to rotate.

[0062] Figure 3 A schematic view of a stator of a drive motor in an oil-cooled power assembly is provided in embodiments of the present application. As shown in Figure 3 The stator 110 of the drive motor 100 includes a stator core 111 and a stator winding 112. The stator winding 112 includes a plurality of winding leads 1121. The plurality of winding leads 1121 are configured to electrically connect to the three-phase current carrier 300 and receive three-phase alternating current from the three-phase current carrier 300. In an embodiment, the plurality of winding leads 1121 are winding bus bars.

[0063] In an embodiment, the stator winding 112 includes three-phase windings and three winding leads 1121. Each phase of the three-phase windings includes a plurality of groups of windings connected in parallel, and each group of windings in parallel of each phase receives one phase of alternating current through one winding lead 1121.

[0064] Referring to Figure 4 The winding leads 1121 of the stator 110 of the drive motor 100 protrude relative to the stator winding 112 to facilitate connection of the winding leads 1121 to the three-phase current carrier 300.

[0065] Figure 4 A schematic view of a housing of an oil-cooled power assembly is provided in embodiments of the present application. As shown in Figure 4 The housing of the oil-cooled power assembly 10 includes an integrated housing 400, which includes a motor slot G1 and an electric control slot G2. The motor slot G1 is configured to secure the stator 110 of the drive motor 100, and the electric control slot G2 is configured to accommodate electrical components of the motor controller 200.

[0066] As shown in Figure 4 The oil-cooled power assembly 10 further includes a motor end cover 410 and an electric control cover plate 420. The motor end cover 410 is configured to enclose the motor slot G1 to form a motor accommodating cavity. The electric control cover plate 420 is configured to enclose the electric control slot G2 to form an electric control accommodating cavity.

[0067] In an embodiment, the orientation of the slot of the motor slot G1 is perpendicular to the orientation of the slot of the electric control slot G2. In an embodiment, the orientation of the slot of the motor slot G1 is parallel to the axial direction of the drive motor 100. Thus, the space of the housing of the oil-cooled power assembly 10 can be fully utilized.

[0068] In embodiments of the present application, the axial direction of the drive motor 100 can be understood as the axial direction of the motor shaft 130 of the drive motor 100, the axial direction of the stator core 111 of the drive motor 100, or the axial direction of the oil-cooled power assembly 10.

[0069] The motor end cover 410 includes an accommodating slot G3 configured to accommodate the three-phase current carrier 300.

[0070] In an embodiment, the protruding direction of the winding lead-out end 1121 of the stator 110 of the driving motor 100 is towards the motor end cover 410, so as to facilitate the connection of the winding lead-out end 1121 and the three-phase current transmission member 300.

[0071] As shown in Figure 4 , the oil-cooled power assembly 10 further comprises a motor cover plate 430, the motor cover plate 430 is used to enclose the accommodating groove G3 of the motor end cover 410 to form a three-phase current transmission member accommodating cavity. In an embodiment, the direction of the slot opening of the accommodating groove G3 is the same as the direction of the slot opening of the motor groove G1.

[0072] As described in the background section, in the prior art, in order to achieve the cooling of the three-phase current transmission member, it is necessary to provide an oil injection structure in the motor cavity of the oil-cooled power assembly along the axial direction of the power assembly, which causes the axial dimension of the motor cavity of the oil-cooled power assembly, which is not conducive to the miniaturization of the oil-cooled power assembly.

[0073] Figure 5 A schematic view of the integrated shell of the oil-cooled power assembly provided by the embodiments of the present application. The integrated shell 400 comprises a through hole 401 for communicating the slot wall of the electric control groove G2. The three-phase current transmission member 300 is connected to the stator winding 112 of the stator 110 of the driving motor 100 and the electrical components of the motor controller 200 through the through hole 401 of the integrated shell 400, respectively.

[0074] In an embodiment, as shown in Figure 5 , the through hole 401 of the integrated shell 400 is along the axial direction of the driving motor 100 and the slot wall of the electric control groove G2, that is, the through hole 401 of the integrated shell 400 penetrates the slot wall of the electric control groove G2 along the axial direction of the driving motor 100.

[0075] In an embodiment, the height of the through hole 401 of the integrated shell 400 is greater than the width of the through hole 401. Among them, the height of the through hole 401, the width of the through hole 401, and the length of the through hole 401 are perpendicular to each other. The height direction of the through hole 401 is parallel to the direction of the slot opening of the motor groove G1, and the length direction of the through hole 401 is the direction of the through hole 401 and the slot wall of the electric control groove G2. As shown in Figure 5 , the height direction of the through hole 401 is the x direction, and the width direction of the through hole 401 is the y direction. Thus, the influence of the through hole 401 of the integrated shell 400 on the component arrangement of the motor controller 200 in the motor groove G1 is reduced.

[0076] In an embodiment, as shown in Figure 5As shown, the integrated housing 400 also includes a liquid outlet 402 for receiving oil through the internal flow channel of the integrated housing 400. The integrated housing 400 can then lead the oil from the internal flow channel of the integrated housing 400 out of the integrated housing 400 through the liquid outlet 402 to cool the three-phase current transmission component 300 and lubricate the bearings of the motor shaft 130 of the drive motor 100, thereby improving the performance of the oil-cooled powertrain 10.

[0077] In one embodiment, the internal flow channel of the integrated housing 400 is used to connect to the wall of the motor slot G1, and the liquid outlet 402 of the integrated housing 400 is used to receive oil in the motor slot G1 through the internal flow channel of the integrated housing 400. Thus, excess oil in the motor slot G1 flows into the liquid outlet 402 of the integrated housing 400 through the internal flow channel, which helps to improve the oil utilization rate and reduce the cost of the oil-cooled powertrain 10.

[0078] In one embodiment, the distance between the liquid outlet hole 402 of the integrated housing 400 along the radial direction of the drive motor 100 and the motor slot G1 is less than or equal to the distance between the through hole 401 of the integrated housing 400 and the motor slot G1. That is, compared with the through hole 401 of the integrated housing 400, the liquid outlet hole 402 of the integrated housing 400 is located closer to the motor slot G1, which helps to shorten the oil passage path between the motor slot G1 and the liquid outlet hole 402 of the integrated housing 400, thereby simplifying the processing technology of the oil passage between the motor slot G1 and the liquid outlet hole 402 of the integrated housing 400 and reducing the cost of the oil-cooled power assembly 10.

[0079] In this embodiment, the radial direction of the drive motor 100 can be understood as the radial direction of the motor shaft 130 of the drive motor 100, the radial direction of the stator core 111 of the drive motor 100, and the radial direction of the oil-cooled power assembly 10.

[0080] Figure 6 Another schematic diagram of an oil-cooled powertrain provided in an embodiment of this application. In one embodiment, as... Figure 6 As shown, the wall of the motor slot G1 in the integrated housing 400 includes a liquid inlet hole 403. The internal flow channel of the integrated housing 400 is used to connect the wall of the motor slot G1 through the liquid inlet hole 403. Thus, excess oil in the motor slot G1 flows into the internal flow channel of the integrated housing 400 through the liquid inlet hole 403 on the wall of the motor slot G1, and then into the liquid outlet hole 402 of the integrated housing 400. This simplifies the machining process of the oil passage between the motor slot G1 and the liquid outlet hole 402 of the integrated housing 400, and reduces the cost of the oil-cooled powertrain 10.

[0081] In one embodiment, the oil-cooled power assembly 10 further comprises an oil spray ring 600, the motor slot G1 of the integrated housing 400 is configured to accommodate the oil spray ring 600, the end of the stator winding 112 of the stator 110 of the drive motor 100 exposed to the stator core 111 of the stator 110 of the drive motor 100 in the axial direction of the drive motor 100, and the oil spray ring 600 is arranged around the end of the stator winding 112 of the stator 110 of the drive motor 100. Thus, the oil spray ring 600 can spray the oil collected by it to the end of the stator winding 112 of the stator 110 of the drive motor 100, thereby cooling the stator winding 112 of the stator 110 of the drive motor 100.

[0082] In one embodiment, the distance between the liquid inlet hole 403 of the integrated housing 400 and the slot opening of the motor slot G1 in the axial direction of the drive motor 100 is greater than the distance between the oil spray ring 600 and the slot opening of the motor slot G1 and less than the distance between the stator core 111 of the stator 110 of the drive motor 100 and the slot opening of the motor slot G1. As shown in Figure 6 the distance between the liquid inlet hole 403 of the integrated housing 400 and the slot opening of the motor slot G1 is d1, the distance between the oil spray ring 600 and the slot opening of the motor slot G1 is d2, and the distance between the stator core 111 of the stator 110 of the drive motor 100 and the slot opening of the motor slot G1 is d3, d2 < d1 < d3.

[0083] That is, the liquid inlet hole 403 on the slot wall of the motor slot G1 in the axial direction of the drive motor 100 is arranged between the oil spray ring 600 and the stator core 111, so that the excess oil between the oil spray ring 600 and the slot wall of the motor slot G1 flows into the internal flow channel of the housing along the liquid inlet hole 403 on the slot wall of the motor slot, which is conducive to improving the utilization rate of the oil introduced by the stator core 111 into the oil spray ring 600 and reducing the cost of the oil-cooled power assembly 10. In addition, it is also conducive to reducing the pressure of the oil between the oil spray ring 600 and the slot wall of the motor slot G1, thereby avoiding the failure of the oil spray ring 600 or the motor slot G1 caused by excessive pressure of the oil between the oil spray ring 600 and the slot wall of the motor slot G1.

[0084] Figure 7 A schematic diagram of a three-phase current transmission member provided by an embodiment of the present application. Figure 8 A schematic diagram of an oil-cooled power assembly provided by an embodiment of the present application. As shown in Figure 7 and Figure 8 the three-phase current transmission member 300 comprises a first group of copper bars 301 and a second group of copper bars 302. As shown in Figure 8 the first group of copper bars 301 extends into the electronic control slot G2 through the through hole 401 of the integrated housing 400, one end of the first group of copper bars 301 extending into the electronic control slot G2 is used for electrically connecting the electrical components of the motor controller 200, and the other end of the first group of copper bars 301 exposed to the electronic control slot G2 is used for electrically connecting the stator winding 112 of the stator 110 of the drive motor 100 through the second group of copper bars 302.

[0085] In an embodiment, at least one of the first group of copper bars 301 or the second group of copper bars 302 includes three copper bars 3011-3013 or 3021-3023, each of which is used to transmit one phase of the alternating current. As shown in FIG. 4, the first group of copper bars 301 includes three copper bars 3011-3013, each of which is used to transmit one phase of the three-phase alternating current. The second group of copper bars 302 includes three copper bars 3021-3023, each of which is used to transmit one phase of the three-phase alternating current. Figure 7 In an embodiment, as shown in FIG. 4, each of the three copper bars 3011-3013 of the first group of copper bars 301 in the three-phase current transmission member 300 includes an end A extending into the electrically controlled groove G2, an end B exposed outside the electrically controlled groove G2, and a wrapped portion C. The end A of each of the three copper bars 3011-3013 of the first group of copper bars 301 is used to electrically connect to the electrical components of the motor controller 200, and the end B of each of the three copper bars 3011-3013 of the first group of copper bars 301 is used to electrically connect to one of the second group of copper bars 302. The plastic member 500 is used to wrap the wrapped portion C of each of the three copper bars 3011-3013 of the first group of copper bars 301.

[0086] Figure 7 In an embodiment, the extension direction of the end A of each of the three copper bars 3011-3013 of the first group of copper bars 301, the extension direction of the end B of each of the three copper bars 3011-3013 of the first group of copper bars 301, and the extension direction of the wrapped portion C of each of the three copper bars 3011-3013 of the first group of copper bars 301 are perpendicular to each other. For example, the extension direction of the end A of each of the three copper bars 3011-3013 of the first group of copper bars 301 is parallel to the length direction of the through hole 401. The extension direction of the end B of each of the three copper bars 3011-3013 of the first group of copper bars 301 is parallel to the height direction of the through hole 401. The extension direction of the wrapped portion C of each of the three copper bars 3011-3013 of the first group of copper bars 301 is parallel to the axial direction of the driving motor 100.

[0087] In an embodiment, the ends A of the three copper bars 3011-3013 of the first group of copper bars 301 are arranged in a straight line. The three alternating current output terminals of the electrical components of the motor controller 200 that output the three-phase current are usually arranged in a straight line, thereby facilitating the connection of the first group of copper bars 301 to the electrical components of the motor controller and simplifying the installation of the oil-cooled power assembly 10.

[0088] In an embodiment, the wrapped portions C of the three copper bars 3011-3013 of the first group of copper bars 301 are arranged in a straight line. In combination with the arrangement of the ends A of the three copper bars 3011-3013 of the first group of copper bars 301 in a straight line, the wrapped portions C of the three copper bars 3011-3013 of the first group of copper bars 301 are arranged in a straight line, thereby facilitating the connection of the first group of copper bars 301 to the electrical components of the motor controller and simplifying the installation of the oil-cooled power assembly 10.

[0089] ​​Figure 8 As shown in FIG. 4, the wrapped portions C of the three copper bars 3011-3013 in the first group of copper bars 301 are arranged in a straight line along the height direction of the through hole 401 of the integrated housing 400. Thus, the influence of the three copper bars 3011-3013 in the first group of copper bars 301 on the arrangement of the components of the motor controller 200 in the motor slot G1 is reduced.

[0090] In an embodiment, as shown in FIG. 4, the extension direction of the one end D of each copper bar 3021-3023 of the second group of copper bars 302 electrically connected to one winding lead-out end 1121 of the stator winding 112 of the stator 110 of the driving motor 100 is perpendicular to the extension direction of the remaining portion of each copper bar 3021-3023 of the second group of copper bars 302. For example, the extension direction of the one end D of each copper bar 3021-3023 of the second group of copper bars 302 is parallel to the height direction of the through hole 401. The extension direction of the remaining portion of each copper bar 3021-3023 of the second group of copper bars 302 is parallel to the axial direction of the driving motor 100. Figure 7

[0091] In an embodiment, the one end D of each copper bar 3021-3023 of the second group of copper bars 302 is arranged in an arc line. The three winding lead-out ends 1121 of the stator winding 112 in the driving motor 100 are generally arranged in an arc line. Thus, the connection of the second group of copper bars 302 with the three winding lead-out ends 1121 in the driving motor 100 is facilitated, and the installation of the oil-cooled power assembly 10 is simplified.

[0092] In an embodiment, in the three-phase current transmission member 300, each copper bar 3011-3013 in the first group of copper bars 301 includes one connecting hole 303, and each copper bar 3021-3023 in the second group of copper bars 302 includes another connecting hole 304. As shown in FIG. 4, the connecting hole 303 of each copper bar 3011-3013 in the first group of copper bars 301 and the connecting hole 304 of each copper bar 3021-3023 in the second group of copper bars 302 are matched, and a fixing member passes through the connecting hole 303 and the connecting hole 304 to fix each copper bar 3011-3013 in the first group of copper bars 301 and each copper bar 3021-3023 in the second group of copper bars 302. Figure 7

[0093] Figure 9 A schematic view of a plastic member provided in an embodiment of the present application. The oil-cooled power assembly 10 further includes a plastic member 500 for wrapping the first group of copper bars 301 in the three-phase current transmission member 300.

[0094] In an embodiment, as shown in FIG. 4, the extension direction of the one end D of each copper bar 3021-3023 of the second group of copper bars 302 electrically connected to one winding lead-out end 1121 of the stator winding 112 of the stator 110 of the driving motor 100 is perpendicular to the extension direction of the remaining portion of each copper bar 3021-3023 of the second group of copper bars 302. For example, the extension direction of the one end D of each copper bar 3021-3023 of the second group of copper bars 302 is parallel to the height direction of the through hole 401. The extension direction of the remaining portion of each copper bar 3021-3023 of the second group of copper bars 302 is parallel to the axial direction of the driving motor 100. Figure 9 ​​As shown in FIG. 6, the plastic member 500 includes a wrapping section 510, which wraps the three copper bars 3011-3013 of the first group of copper bars 301, respectively, so that the three copper bars 3011-3013 of the first group of copper bars 301 are electrically insulated from each other, thereby avoiding the distance between the three copper bars 3011-3013 of the first group of copper bars 301 changing during the driving of the electric vehicle 1, and improving the reliability of the oil-cooled power assembly 10.

[0095] Figure 10 Another schematic view of the oil-cooled power assembly is provided in the embodiments. The integrated shell 400 is used to fix the plastic member 500, thereby preventing the plastic member 500 from separating from each of the copper bars 3011-3013 of the first group of copper bars 301 during the driving of the electric vehicle 1.

[0096] In an embodiment, the plastic member 500 includes a plurality of fixing ends 520, which are used to fix the plastic member 500 and the wrapping section 510. As shown in FIG. 7, Figure 9 and Figure 10 The plastic member 500 includes three fixing ends 520. As shown in FIG. 8, Figure 9 and Figure 10 The plurality of fixing ends 520 are used to fix different parts of the wrapping section 510, respectively, and the plurality of fixing ends 520 are fixed to the integrated shell 400 from different parts of the wrapping section 510, thereby reducing the displacement of the wrapping section 510 during the driving of the electric vehicle 1, preventing the wrapping section 510 from interfering with the components of the motor controller 200 in the electric control groove G2, and improving the reliability of the oil-cooled power assembly 10.

[0097] In an embodiment, as shown in FIG. 9, Figure 9 and Figure 10 Each of the fixing ends 520 includes a fixing hole 521, and each of the fixing holes 521 of the fixing ends 520 is used to embed a fixing member. Each of the fixing members is fixed to the integrated shell 400 after passing through the fixing hole 521 of each of the fixing ends 520, so that the plastic member 500 is fixed to the integrated shell 400, thereby reducing the displacement of the three copper bars 3011-3013 of the first group of copper bars 301 during the driving of the electric vehicle 1, improving the stability of the three-phase current transmission member 300, and ensuring the reliability of the oil-cooled power assembly 10.

[0098] In an embodiment, the integrated shell 400 includes a plurality of threaded holes 404. The threaded holes 404 are used to fix the plastic member 500. As shown in FIG. 10, Figure 5 The integrated shell 400 includes three threaded holes 404. In combination with Figure 10As shown, after each fixing member passes through the fixing hole 521 of each fixing end 520 of the plastic member 500, each fixing member is embedded in the threaded hole 404 of the integrated shell 400, and the threaded hole 404 of the integrated shell 400 engages the external thread of the fixing member, so as to fixedly connect the plastic member 500 and the integrated shell 400, thereby improving the reliability of the oil-cooled power assembly 10.

[0099] In an embodiment, as shown, the plurality of threaded holes 404 of the integrated shell 400 surround the through hole 401 of the integrated shell 400. Thus, the plastic member 500 can enclose the through hole 401 of the integrated shell 400, thereby avoiding foreign matter from entering the through hole 401, improving the stability of the first group of copper bars 301 of the three-phase current transmission member 300, and ensuring the reliability of the oil-cooled power assembly 10. Figure 5

[0100] In an embodiment, each fixing hole 521 comprises an internal thread. During the process of each fixing member passing through the fixing hole 521, the internal thread of each fixing hole 4621 engages the external thread of the fixing member, thereby improving the stability of the plastic member 500, and further improving the reliability of the oil-cooled power assembly 10.

[0101] During the assembly process of the oil-cooled power assembly 10, the first group of copper bars 301 passes through the plastic member 500, the plastic member 500 passes through the through hole 401 of the integrated shell 400 and extends into the control groove G2 and is fixedly connected with the integrated shell 400, and the first group of copper bars 301 is connected with the electrical components of the motor controller 200. Then, the second group of copper bars 302 is electrically connected with the first group of copper bars 301, and the second group of copper bars 302 is electrically connected with the stator winding 112 of the stator 110 of the drive motor 100, which is conducive to simplifying the installation process of the oil-cooled power assembly 10.

[0102] The plastic member 500 is also used to receive oil liquid transmitted by the internal flow channel of the integrated shell 400, and the oil liquid received by the plastic member 500 is used to cool at least one of the first group of copper bars 301 or the second group of copper bars 302.

[0103] Figure 11 Another schematic view of the oil-cooled power assembly provided by the embodiments of the present application is provided. In combination with Figure 11 ​The oil-cooled power assembly 10 provided by the embodiments of the present application is characterized in that the first group of copper bars 301 of the three-phase current transmission member 300 is wrapped with a plastic member 500, the plastic member 500 passes through the through hole 401 of the integrated shell 400 and is fixed to the integrated shell 400, the plastic member 500 can receive the oil liquid transmitted by the internal flow channel of the integrated shell 400 to cool at least one group of copper bars of the two groups of copper bars 301 and 302, thereby eliminating the need to set a dedicated oil injection structure in the axial direction, effectively utilizing the structure of the plastic member 500 wrapped outside the first group of copper bars 301, achieving electrical isolation of the first group of copper bars 301 and cooling of at least one group of copper bars of the two groups of copper bars 301 and 302, reducing the axial size of the oil-cooled power assembly 10, and further reducing the overall size of the oil-cooled power assembly 10, which is conducive to the miniaturization of the power assembly 10. Further, the driving space of the electric vehicle 1 is increased, and the driving experience of the electric vehicle 1 is improved.

[0104] In addition, the reuse of the plastic member 500 also helps to reduce the cost of the oil-cooled power assembly 10. The first group of copper bars 301 passes through the plastic member 500 to complete the assembly process of the corresponding cooling system of the oil-cooled power assembly 10, which is conducive to simplifying the installation process of the oil-cooled power assembly 10.

[0105] In an embodiment, the plastic member 500 receives the oil liquid transmitted by the internal flow channel of the integrated shell 400 through the liquid outlet hole 402 of the integrated shell 400. Thus, the oil liquid of the internal flow channel of the integrated shell 400 is introduced into the plastic member 500 through the liquid outlet hole 402 of the integrated shell 400, which helps to reduce the complexity of the cooling system of the three-phase current transmission member 300, and makes the assembly process of the cooling system of the three-phase current transmission member 300 simple.

[0106] Figure 12 And Figure 13 are another schematic view of the plastic member provided by the embodiments of the present application. In an embodiment, in combination with Figure 12 And Figure 13As shown, the plastic member 500 includes an inlet 530, an internal flow channel, and a plurality of outlets 540. The inlet 530 of the plastic member 500 is configured to receive the oil outputted from the outlet hole 402 of the integrated housing 400. The internal flow channel of the plastic member 500 is configured to connect the inlet 530 and the plurality of outlets 540 of the plastic member 500. The oil in the internal flow channel of the plastic member 500 is configured to flow through the first group of copper bars 302 wrapped by the plastic member 500. The plurality of outlets 540 of the plastic member 500 are configured to output the oil to cool the second group of copper bars 302. Thus, the oil outputted from the outlet hole 402 of the integrated housing 400 flows into the internal flow channel of the plastic member 500 through the inlet 530 of the plastic member 500, and then flows out of the internal flow channel of the plastic member 500 through the plurality of outlets 540 of the plastic member 500 to cool the second group of copper bars 302 of the three-phase current transmission member 300, thereby improving the performance of the oil-cooled power assembly 10.

[0107] In an embodiment, as shown in Figure 13 the plastic member 500 includes three outlets 540, each of the three outlets 540 is configured to cool one of the three copper bars 3021-3023 of the second group of copper bars 302.

[0108] In an embodiment, as shown in Figure 13 the plastic member 500 includes a surface 550 facing the second group of copper bars 302, and the surface 550 of the plastic member 500 includes three outlets 540. As shown in Figure 9 and Figure 10 each of the three outlets 540 faces one of the three copper bars 3021-3023 of the second group of copper bars 302, and each of the three outlets 540 is configured to output the oil to cool one of the three copper bars 3021-3023 of the second group of copper bars 302. Thus, the oil outputted from each of the three outlets 540 of the plastic member 500 is sprayed on one of the three copper bars 3021-3023 of the second group of copper bars 302 to cool each of the three copper bars 3021-3023 of the second group of copper bars 302, thereby improving the cooling effect of the second group of copper bars 302 and improving the performance of the oil-cooled power assembly 10.

[0109] In an embodiment, as shown in Figure 12 the plastic member 500 further includes another surface 560 facing the integrated housing 400, and the surface 560 of the plastic member 500 includes a protrusion 561 including the inlet 530, and the protrusion 561 is configured to be embedded in the outlet hole 402 of the integrated housing 400. Thus, the inlet 530 of the plastic member 500 is facilitated to receive the oil outputted from the outlet hole 402 of the integrated housing 400, and the installation process of the oil-cooled power assembly is simplified.

[0110] In an embodiment, the plastic part 500 further comprises a plurality of blocking holes 570, each of the blocking holes 570 is used to connect each of the liquid outlets 540 of the plastic part 500, and each of the blocking holes 570 is used to embed a blocking member. In combination with Figure 12 and Figure 13 , the plastic part 500 further comprises two other surfaces 571 and 572, the two other surfaces 571 and 572 of the plastic part 500 are arranged in opposite directions along the arrangement direction of the plurality of liquid outlets 540 of the plastic part 500, and the blocking holes 570 are used to connect the two other surfaces 571 and 572 of the plastic part 500. Thus, the connection of the plurality of liquid outlets 540 of the plastic part 500 is facilitated, and the processing technology of the oil channel of the plastic part 500 is simplified.

[0111] In an embodiment, the plastic part 500 is further used to fix the first group of copper bars 301 and the second group of copper bars 302. The plastic part 500 further comprises a plurality of connecting holes 580, each of the connecting holes 580 is used to embed a connecting member, and the connecting member is used to electrically connect one copper bar of the first group of copper bars 301 and one copper bar of the second group of copper bars 302. As shown in Figure 13 , the plastic part 500 further comprises three connecting holes 580, and each of the connecting members is embedded in each of the connecting holes 580 of the plastic part 500 after passing through the connecting holes 303 of each of the copper bars 3011-3013 of the first group of copper bars 301 and the connecting holes 304 of each of the copper bars 3021-3023 of the second group of copper bars 302. Thus, the first group of copper bars 301 and the second group of copper bars 302 are fixed, and the electrical connection between the two groups of copper bars 301 and 302 is avoided during the driving of the electric vehicle 1, and the reliability of the oil-cooled power assembly 10 is improved.

[0112] In an embodiment, the plurality of connecting holes 580 of the plastic part 500 are arranged on the side of the plurality of liquid outlets 540 away from the central axis of the driving motor 100. Thus, the oil output by each of the liquid outlets 540 is directly sprayed on the second group of copper bars 302, the cooling effect of the second group of copper bars 302 is improved, and the performance of the oil-cooled power assembly 10 is improved.

[0113] Figure 14 Another schematic diagram of the plastic part provided by the embodiments of the present application. In an embodiment, as shown in Figure 14As shown, the plurality of connecting holes 580 of the plastic member 500 are arranged in an arc. The three winding lead-out terminals 1121 of the stator winding 112 of the stator 110 of the driving motor 100 are usually arranged in an arc, and the second group of copper bars 302 are connected to the first group of copper bars 301 and the three winding lead-out terminals 1121 respectively. The connecting holes 580 connecting the two groups of copper bars 301 and 302 are arranged in an arc, which facilitates the connection of the first group of copper bars 301 to the second group of copper bars 302 and the three winding lead-out terminals 1121 of the driving motor 100, and simplifies the installation of the oil-cooled power assembly 10.

[0114] In an embodiment, the plurality of connecting holes 580 of the plastic member 500 are arranged in an arc along the circumference of the driving motor 100. The three winding lead-out terminals 1121 of the stator winding 112 of the stator 110 of the driving motor 100 are usually arranged in an arc along the circumference of the driving motor 100, which further facilitates the connection of the first group of copper bars 301 to the second group of copper bars 302 and the three winding lead-out terminals 1121 of the driving motor 100.

[0115] In the embodiments of the present application, the circumference of the driving motor 100 can be understood as the circumference of the motor shaft 130 of the driving motor 100, the circumference of the stator core 111 of the driving motor 100, and the circumference of the oil-cooled power assembly 10.

[0116] Figure 15 A schematic diagram of the motor end cover provided in the embodiments of the present application is shown. As shown, Figure 15 The motor end cover 410 includes a shaft hole 411, and the shaft hole 411 of the motor end cover 410 is used to pass through the motor shaft 130 of the driving motor 100.

[0117] Figure 16 Another schematic diagram of the oil-cooled power assembly provided in the embodiments of the present application is shown. In an embodiment, the oil-cooled power assembly 10 further includes a rotary variable differential transformer (RVDT) sensor 700, which is used to measure the rotational speed of the motor shaft 130 of the driving motor 100 and to transmit a rotational speed signal to the motor controller 200. The rotational speed signal is used to indicate the rotational speed of the driving motor 100. The shaft hole 411 of the motor end cover 410 is further used to fix the stator 710 of the RVDT sensor 700, and the rotor 720 of the RVDT sensor 700 is used to be drivingly connected to the motor shaft 130 of the driving motor 100. The RVDT sensor 700 further includes a signal line interface 730, which is used to be fixed to the stator 710 of the RVDT sensor 700, and the RVDT sensor 700 is used to be electrically connected to the electrical components of the motor controller 200 through the signal line interface 730 of the RVDT sensor 700.

[0118] As shown, Figure 14 The plastic member 500 further includes a threading hole 590, and the threading hole 590 of the plastic member 500 is used to pass through a signal line 800. As shown, Figure 16As shown, one end of the signal line 800 is connected to the electrical components of the motor controller 200 through the threading hole 590 of the plastic member 500, and the other end of the signal line 800 is used to electrically connect the signal line interface 730 of the resolver sensor 700. Thus, the threading hole 590 multiplexes the structure of the plastic member 500, which is conducive to reducing the cost of the oil-cooled power assembly 10.

[0119] In an embodiment, as shown, the threading hole 590 of the plastic member 500 is arranged on the side of the three liquid outlets 540 of the plastic member 500 away from the central axis of the drive motor 100. Thus, the oil output by each liquid outlet 540 does not interfere with the signal line, thereby improving the reliability of the oil-cooled power assembly 10. Figure 14

[0120] In an embodiment, the accommodation groove G3 of the motor end cover 410 is used to accommodate the second group of copper bars 302 in the three-phase current transmission member 300. As shown, Figure 15 the motor end cover 410 includes two through holes 412 and 413. One end of the first group of copper bars 301 exposed at the other end of the electrical control groove G2 passes through one of the two through holes 412 and 413 to electrically connect one end of the second group of copper bars 302, and the other end of the second group of copper bars 302 passes through the other through hole 413 to electrically connect the stator winding 112 of the stator 110 of the drive motor 100.

[0121] Figure 17 Another schematic diagram of the oil-cooled power assembly provided by the embodiments of the present application. In combination with Figure 16 and Figure 17 , in the power assembly 10 provided by the embodiments of the present application, the accommodation groove G3 of the motor end cover 410 is used to accommodate the second group of copper bars 302 in the three-phase current transmission member 300, the first group of copper bars 301 in the three-phase current transmission member 300 passes through the through hole 412 to connect the electrical components of the motor controller 200, and the second group of copper bars 302 in the three-phase current transmission member 300 passes through the through hole 413 to connect the winding lead end 1121. The space of the motor end cover 410 is fully utilized, and there is no need to reserve space in the motor groove G1, which reduces the axial size of the oil-cooled power assembly 10, is conducive to the miniaturization of the power assembly 10, and increases the driving and riding space of the electric vehicle 1, and improves the driving and riding experience of the electric vehicle 1.

[0122] In an embodiment, the two through holes 412 and 413 pass through the motor end cover 410 along the axial direction of the drive motor 100. The two through holes 412 and 413 are arranged along the radial direction of the drive motor 100. Thus, not only the space of the motor end cover 410 can be fully utilized, but also the length of the second group of copper bars 302 in the three-phase current transmission member 300 can be reduced.

[0123] ​The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil-cooled power assembly, characterized by The oil-cooled power assembly includes a housing, a motor slot, an electronic control slot, and a through hole, the motor slot is configured to secure a stator of a drive motor, the electronic control slot is configured to accommodate electrical components of a motor controller, the through hole is configured to extend through a slot wall of the electronic control slot along an axial direction of the drive motor, the housing is further configured to secure a plastic member, wherein: the plastic member is configured to wrap a first set of copper bars and to receive oil transmitted by an internal flow passage of the housing, the first set of copper bars extends into the electronic control slot through the through hole, an end of the first set of copper bars extending into the electronic control slot is configured to electrically connect the electrical components of the motor controller, another end of the first set of copper bars exposed from the electronic control slot is configured to electrically connect stator windings of the stator of the drive motor through a second set of copper bars, the oil received by the plastic member is configured to cool at least one of the first set of copper bars or the second set of copper bars.

2. The oil-cooled power assembly of claim 1, wherein, The housing further includes an oil outlet hole configured to receive oil through the internal flow passage of the housing, the plastic member is configured to receive oil transmitted by the internal flow passage of the housing through the oil outlet hole.

3. The oil-cooled power assembly of claim 2, wherein, The internal flow passage of the housing is configured to communicate with the slot wall of the motor slot, the oil outlet hole is configured to receive oil in the motor slot through the internal flow passage of the housing, wherein: a distance between the oil outlet hole and the motor slot along a radial direction of the drive motor is less than or equal to a distance between the through hole and the motor slot.

4. The oil-cooled power assembly of claim 3, wherein, The slot wall of the motor slot includes an oil inlet hole, the internal flow passage of the housing is configured to communicate with the slot wall of the motor slot through the oil inlet hole, the motor slot is further configured to accommodate an oil spray ring, an end of the stator windings of the stator of the drive motor is exposed from a stator core of the stator of the drive motor along an axial direction of the drive motor, the oil spray ring is configured to surround the end of the stator windings of the stator of the drive motor, wherein: a distance between the oil inlet hole and the slot opening of the motor slot along the axial direction of the drive motor is greater than a distance between the oil spray ring and the slot opening of the motor slot and less than a distance between the stator core and the slot opening of the motor slot.

5. The oil-cooled power assembly of claim 2, wherein, The plastic member includes an oil inlet port and a plurality of oil outlet ports, the oil inlet port is configured to receive oil output from the oil outlet hole, the plurality of oil outlet ports are configured to output oil to cool the second set of copper bars.

6. The oil-cooled power assembly of claim 5, wherein, The plastic member includes another surface facing the housing, the another surface of the plastic member includes a protrusion, the protrusion includes the oil inlet port, the protrusion is configured to be embedded in the oil outlet hole.

7. The oil-cooled power assembly of claim 5, wherein, The second set of copper bars includes three copper bars, each of the three copper bars is configured to transmit an alternating current of a phase, the plastic member includes a surface facing the second set of copper bars, the surface of the plastic member includes three oil outlet ports, wherein: Each of the three liquid outlets is arranged towards one of the three copper bars, and each of the three liquid outlets is configured to output oil to cool one of the three copper bars.

8. The oil-cooled power assembly of claim 7, wherein, The plastic member further comprises two other surfaces arranged opposite to each other along the arrangement direction of the plurality of liquid outlets, and the plastic member further comprises a blocking hole configured to communicate each of the liquid outlets and the two other surfaces of the plastic member, and each blocking opening of the blocking hole is configured to embed a blocking member.

9. The oil-cooled power assembly of claim 7, wherein, The plastic member further comprises a threading hole configured to pass a signal line, and the signal line is configured to electrically connect an electrical component of the motor controller and a signal line interface of the resolver sensor, and the signal line interface is configured to be fixed to a stator of the resolver sensor. The threading hole is arranged on a side of the three liquid outlets away from the central axis of the driving motor.

10. The oil-cooled power assembly of claim 5, wherein, The plastic member further comprises an internal flow channel configured to communicate the liquid inlet and the plurality of liquid outlets, and the oil in the internal flow channel of the plastic member is further configured to flow through the first group of copper bars wrapped by the plastic member.

11. The oil-cooled power assembly of claim 5, wherein, The plastic member further comprises a plurality of connecting holes, and each connecting hole is configured to embed a connecting member, and each connecting member is configured to electrically connect one copper bar of the first group of copper bars and one copper bar of the second group of copper bars. The plurality of connecting holes are arranged on a side of the plurality of liquid outlets away from the central axis of the driving motor.

12. The oil-cooled power assembly of claim 11, wherein, The plurality of connecting holes are arranged in an arc line.

13. The oil-cooled power assembly of claim 1, wherein, The motor end cover of the oil-cooled power assembly is configured to enclose the motor slot, and the motor end cover is configured to accommodate the second group of copper bars, and the motor end cover comprises two through holes, and one end of the first group of copper bars exposed at the other end of the motor slot passes through one of the two through holes to electrically connect one end of the second group of copper bars, and the other end of the second group of copper bars passes through the other of the two through holes to electrically connect the stator winding of the stator of the driving motor. The two through holes pass through the motor end cover along the axial direction of the driving motor. The two through holes are arranged along the radial direction of the driving motor.

14. The oil-cooled power assembly of any one of claims 1-13, wherein, The housing further comprises a plurality of threaded holes surrounding the through hole, and each threaded hole is configured to embed a fixing member configured to fixedly connect the plastic member and the housing.

15. An electric vehicle characterized by comprising: The electric vehicle comprises wheels, a transmission mechanism, and the oil-cooled power assembly according to any one of claims 1 to 14, and the oil-cooled power assembly is configured to drive the wheels through the transmission mechanism.

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