Driving motor, power assembly and electric vehicle

Abstract

The invention provides a driving motor, a power assembly and an electric vehicle. The driving motor comprises a rotor and a stator, a center hole of an iron core of the stator is used for containing the rotor, a plurality of winding grooves of the iron core are used for containing windings of the stator, a plurality of punching sheets in the iron core are sequentially and adjacently arranged in the axial direction of the iron core, and the center hole and the winding grooves penetrate through the punching sheets in the axial direction of the driving motor. And each punching sheet comprises a plurality of oil holes which are distributed at intervals along the circumferential direction of the iron core. The outer circumferential surface of each punching sheet comprises a plurality of different types of groove groups which are distributed at intervals along the circumferential direction of the iron core, each groove group comprises a positioning groove and a marking groove, the intervals between the two positioning grooves in the two adjacent groove groups are the same, and the shapes of the marking grooves in the two adjacent groove groups are different or the intervals between the marking grooves and the positioning grooves are different. According to the arrangement condition of the plurality of groove groups of the plurality of punching sheets, whether the plurality of punching sheets are correctly spirally stacked along the circumferential direction of the iron core is detected, a large amount of human input is not needed, and the production cost of the driving motor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly relates to a drive motor, a powertrain, and an electric vehicle. Background Art

[0002] In the powertrain of an electric vehicle, the heat dissipation performance of the drive motor affects the driving range of the electric vehicle. The heat generated by the energization of the stator windings of the motor stator in the drive motor is the main heat source of the drive motor. In the prior art, an oil outlet channel is provided in the stator core of the motor stator, and the cooling oil output from the oil outlet channel is sprayed on the stator windings to dissipate heat therefrom.

[0003] In order to improve the heat dissipation effect of the cooling oil output from the oil outlet channel on the stator windings, at least part of the stator laminations of the stator core are stacked circumferentially along the stator core, so that a specific oil outlet channel can be formed in the oil outlet channel of the stator core, and thus the coolant in the oil outlet channel of the stator core can be sprayed toward the stator windings. Currently, a large amount of manpower is invested in detecting whether at least part of the stator laminations of the stator core are stacked correctly, which increases the production cost of the drive motor. Summary of the Invention

[0004] The present application provides a drive motor, a powertrain, and an electric vehicle. By means of the structural features of each stator lamination of the stator core of the drive motor, it is possible to detect whether the stator laminations are stacked correctly, which is beneficial to reducing the production cost of the drive motor, ensuring that the heat dissipation performance of the drive motor is not affected, and further beneficial to improving the performance of the powertrain and the driving range of the electric vehicle.

[0005] In a first aspect, an embodiment of the present application provides a drive motor. The drive motor includes a motor rotor and a motor stator. The motor stator includes a stator core and stator windings. The central hole of the stator core is used to accommodate the motor rotor, and the plurality of winding slots of the stator core are used to accommodate the stator windings. A plurality of stator laminations in the stator core are arranged adjacent to each other in sequence along the axial direction of the stator core, and the central hole and the winding slots penetrate through the plurality of stator laminations along the axial direction of the drive motor. Wherein, each stator lamination includes a plurality of oil holes, and the plurality of oil holes of each stator lamination are spaced apart circumferentially along the stator core. The outer peripheral surface of each stator lamination includes a plurality of different types of groove groups, and the plurality of groove groups are spaced apart circumferentially along the stator core. Each groove group includes a positioning groove and a marking groove. The intervals between the two positioning grooves in two adjacent groove groups are the same, and the shapes of the marking grooves in two adjacent groove groups are different or the intervals between the marking grooves and the positioning grooves are different.

[0006] After multiple stator laminations of the stator core are stacked circumferentially along the stator core, since the intervals between two positioning slots in two adjacent types of groove groups of each stator lamination are the same, it is possible to detect whether the winding slots of two adjacent stator laminations of the stator core are aligned axially along the stator core according to a preset rule by checking whether the positioning slots in two adjacent stator laminations of the stator core are arranged axially along the stator core. In other words, the positioning slots of the stator lamination are used to detect whether the winding slots of multiple stator laminations are correctly assembled after the multiple stator laminations of the stator core are stacked circumferentially along the stator core.

[0007] In addition, since the shapes of the marking slots in two adjacent groove groups are different or the intervals between the marking slots and the positioning slots are different, it is possible to detect whether multiple oil holes of two adjacent stator laminations of the stator core form a specific oil outlet channel by checking whether the marking slots in two adjacent stator laminations of the stator core are arranged axially along the stator core according to a preset rule. In other words, the marking slots of the stator lamination are used to detect whether the oil holes of multiple stator laminations are correctly assembled after the multiple stator laminations of the stator core are stacked circumferentially along the stator core.

[0008] In summary, by checking whether the positioning slots and the marking slots in multiple groove groups of multiple stator laminations of the stator core are arranged according to the corresponding preset rules, it is possible to detect whether multiple stator laminations of the stator core are correctly stacked circumferentially along the stator core. Furthermore, it does not require a large amount of human input, which helps to reduce the production cost of the drive motor and ensure that the heat dissipation performance of the drive motor is not affected.

[0009] In one implementation, the stator core includes a first stator core. In the first stator core, each stator lamination is arranged circumferentially offset from an adjacent stator lamination along the stator core. The same type of groove groups in two adjacent stator laminations are arranged circumferentially offset from each other along the stator core. The marking slots of the same type of groove groups in two adjacent stator laminations are arranged axially offset from each other along the stator core. The positioning slots of different types of groove groups in two adjacent stator laminations are arranged axially aligned with each other along the stator core.

[0010] When multiple stator laminations of the first stator core are stacked circumferentially along the stator core, that is, two adjacent stator laminations of the first stator core are arranged with a circumferential offset along the stator core. If the same type of groove groups in two adjacent stator laminations of the first stator core are arranged with a circumferential offset, specifically, the positioning grooves of different types of groove groups in two adjacent stator laminations of the first stator core are aligned axially along the stator core, it can be regarded that after the multiple stator laminations of the first stator core are stacked circumferentially along the stator core, the positioning grooves of multiple different types of groove groups of the multiple stator laminations of the first stator core can be arranged according to a preset rule. The marking grooves of different types of groove groups in two adjacent stator laminations of the first stator core are arranged with an axial offset, it can be regarded that after the multiple stator laminations of the first stator core are stacked circumferentially along the stator core, the marking grooves of multiple different types of groove groups of the multiple stator laminations of the first stator core can be arranged according to a preset rule.

[0011] In one implementation, each stator lamination in the first stator core is used to partially block multiple oil holes of an adjacent another stator lamination. Each oil hole of each stator lamination in the first stator core is used to partially communicate with an oil hole of an adjacent another stator lamination to form an oil outlet channel, and each oil outlet channel is used to output cooling oil to dissipate heat from the stator winding.

[0012] In other words, the communication direction of the multiple oil holes of the multiple stator laminations of the first stator core intersects with the axis of the stator core. Thus, after the multiple stator laminations of the first stator core are stacked circumferentially along the stator core, the coolant in the oil outlet channels of the first stator core can spray towards the stator winding. Furthermore, after the multiple stator laminations of the first stator core are stacked circumferentially along the stator core, the oil outlet channels of the first stator core can form specific oil outlet channels.

[0013] Among them, the communication area of the oil holes in two adjacent stator laminations in the first stator core is greater than or equal to the blocking area. Thus, it can not only ensure that the oil outlet channels of the first stator core can form specific oil outlet channels after the multiple stator laminations of the first stator core are stacked circumferentially along the stator core, but also ensure that there is sufficient coolant in the specific oil outlet channels formed by the oil outlet channels of the first stator core.

[0014] In one implementation, the stator core includes a second stator core, and the first stator core and the second stator core are arranged adjacent to each other axially along the stator core. The same type of groove groups in two adjacent stator laminations in the second stator core are aligned axially along the stator core. In other words, the multiple stator laminations of the second stator core are not stacked circumferentially along the stator core.

[0015] Since multiple oil outlet channels of the first stator core distributed axially at the ends of the stator core in the stator core need to dissipate heat from the stator winding, multiple stator laminations of the first stator core distributed axially at the ends of the stator core in the stator core are stacked in a circumferential rotation along the stator core, without stacking multiple stator laminations of each stator core of the stator core in a circumferential rotation along the stator core, so that the assembly process of the multiple stator laminations of the stator core can be simplified, and thus it is beneficial to reduce the production cost of the drive motor.

[0016] In addition, by whether the same type of groove groups in two adjacent stator laminations of each stator core of the motor stator are arranged in a circumferential dislocation along the stator core or aligned axially along the stator core, it is detected whether the multiple stator laminations of each stator core are assembled correctly, so that a large amount of manpower input is not required, and thus it is beneficial to reduce the production cost of the drive motor and ensure that the heat dissipation performance of the drive motor is not affected.

[0017] In one implementation, multiple oil holes of one stator lamination in two adjacent stator laminations of the second stator core are respectively communicated with multiple oil holes of the other stator lamination to form multiple coolant channels, and each coolant channel is used to convey coolant to an oil outlet channel. Among them, the communication area of the oil holes in two adjacent stator laminations of the second stator core is larger than the communication area of the oil holes in two adjacent stator laminations of the first stator core. In other words, the angle between the communication direction of the multiple oil holes in two adjacent stator laminations of the first stator core and the axis of the stator core is greater than the angle between the communication direction of the multiple oil holes in two adjacent stator laminations of the second stator core and the axis of the stator core. Thus, it can be ensured that the coolant in each coolant channel of the second stator core smoothly flows into an oil outlet channel of the first stator core, and is quickly sprayed on the stator winding through each oil outlet channel of the first stator core to dissipate heat from it, and thus it is beneficial to improve the heat dissipation effect of the coolant on the stator winding.

[0018] In one implementation, the distances between multiple oil holes in each stator lamination and the axis of the stator core increase sequentially in the clockwise direction.

[0019] Design a type of stator lamination. Stacking multiple stator laminations of the same type in a circumferential rotation along the stator core can form specific oil outlet channels of the first stator core. Thus, the processing process of the stator lamination and the assembly process of the multiple stator laminations of the first stator core can be simplified, and thus it is beneficial to reduce the production cost of the drive motor.

[0020] In one implementation, the number of groove groups in each stator lamination is less than the number of oil holes.

[0021] The number of stator punchings that form specific oil outlet channels in the stator core does not need to be excessive. Therefore, the number of stator punchings that need to be detected for correct circumferential stacking along the stator core in the stator core is small. The number of oil holes in each stator punching determines the heat dissipation effect of the stator winding. Therefore, a large number of oil holes need to be provided on each stator punching. Thus, on the premise of ensuring that multiple stator punchings of the stator core are correctly stacked circumferentially along the stator core and do not affect the heat dissipation effect of the stator winding, setting the number of groove groups in each stator punching to be less than the number of oil holes can simplify the processing technology of the stator punching and the assembly technology of multiple stator punchings, which is conducive to reducing the production cost of the drive motor.

[0022] In one implementation, the positioning grooves in the groove group of each stator punching are distributed between two adjacent oil holes. This is conducive to improving the structural utilization rate of the stator punching.

[0023] In one implementation, the positioning grooves of different types of groove groups in two adjacent stator punchings in the first stator core of the stator core are axially connected along the stator core. Among them, each marking groove of each stator punching is used to partially connect a marking groove of another adjacent stator punching. This is conducive to accelerating the progress of detecting whether multiple stator punchings of the first stator core are stacked correctly.

[0024] In one implementation, the positioning groove and the marking groove in each groove group are distributed on both sides of an oil hole. The intervals between the marking grooves and the positioning grooves in multiple groove groups in each stator punching increase sequentially in the clockwise direction, and the increase value of the interval between the marking groove and the positioning groove in each groove group relative to the interval between the marking groove and the positioning groove in another adjacent groove group in the counterclockwise direction is the same.

[0025] When rotating the interval between the two positioning grooves in two different types of adjacent groove groups in two adjacent stator punchings arranged adjacent to each other in the first stator core circumferentially along the stator core, the misalignment amounts of the marking grooves of two types of adjacent groove groups arranged adjacent to each other in any two adjacent stator punchings in the first stator core are axially misaligned and the same. This is conducive to accelerating the progress of detecting whether multiple stator punchings of the first stator core are stacked correctly.

[0026] In one implementation, the shape of the positioning groove in each groove group of each stator punching is different from the shape of the marking groove. The groove width of the positioning groove in each groove group of each stator punching is greater than the groove width of the marking groove, and the groove depth of the positioning groove in each groove group of each stator punching is greater than the groove depth of the marking groove. This can increase the distinguishability of the marking grooves and positioning grooves in each groove group, which is conducive to accelerating the progress of detecting whether multiple stator punchings of the first stator core are stacked correctly.

[0027] In one implementation, the shapes of the marked slots in multiple groove groups in each stator punching are the same, and the shapes of the positioning slots in multiple groove groups in each stator punching are the same. Thereby, the distinguishability of the marked slots and the positioning slots in each groove group can be increased, which is conducive to accelerating the progress of detecting whether the multiple stator punchings of the first stator core are stacked correctly.

[0028] In one implementation, the marked slots in each groove group in each stator punching in the first stator core are connected to the positioning slots, and the connection modes of the marked slots and the positioning slots in two adjacent groove groups in each stator punching are different. Thereby, the processing technology of each stator punching can be simplified, and the distinguishability of the marked slots in two adjacent groove groups can be increased.

[0029] In one implementation, the marked slots in the groove group are distributed at the bottom of the positioning slot, and at least one of the shape of the marked slots in different types of groove groups or the distribution position at the bottom of the positioning slot is different. Thereby, it is possible to directly detect whether the multiple stator punchings of the first stator core are stacked correctly through the marked slots at the bottom of the positioning slots of each stator punching, which is conducive to accelerating the progress of detecting whether the multiple stator punchings of the first stator core are stacked correctly.

[0030] In one implementation, the marked slots in the groove group are distributed at the notch of the positioning slot, and at least one of the shape of the marked slots in different types of groove groups or the distribution position at the notch of the positioning slot is different. Thereby, it is possible to detect whether the multiple stator punchings of the first stator core are stacked correctly through the marked slots at the notch of the positioning slots of each stator punching, which is conducive to accelerating the progress of detecting whether the multiple stator punchings of the first stator core are stacked correctly.

[0031] In a second aspect, a powertrain is provided. The powertrain includes a reducer and a drive motor as in the first aspect and any one of its implementations. The motor shaft of the drive motor is used for drivingly connecting to the input shaft of the reducer.

[0032] The heat dissipation performance of the drive motor provided in the embodiments of the present application is not affected, which is conducive to improving the performance of the powertrain.

[0033] In a third aspect, an electric vehicle is provided. The electric vehicle includes wheels, a transmission mechanism, and a powertrain as in the second aspect. The powertrain is used for driving the wheels through the transmission mechanism.

[0034] The heat dissipation performance of the drive motor provided in the embodiments of the present application is not affected, which is conducive to increasing the cruising range of the electric vehicle and improving the driving experience of the electric vehicle. Description of the Drawings

[0035] Figure 1 It is a schematic diagram of an electric vehicle provided in the embodiments of the present application.

[0036] Figure 2 A schematic diagram of a drive motor provided by an embodiment of the present application.

[0037] Figure 3 A schematic diagram of a stator core in a motor stator of a drive motor provided by an embodiment of the present application.

[0038] Figure 4 A schematic diagram of a stator punching provided by an embodiment of the present application.

[0039] Figure 5 Another schematic diagram of a stator core provided by an embodiment of the present application.

[0040] Figure 6 Is Figure 5 An enlarged schematic diagram of part B of the stator punching shown in

[0041] Figure 7 Is Figure 3 An enlarged schematic diagram of part A of the stator core shown in

[0042] Figure 8 A schematic diagram of a variety of groove groups provided by an embodiment of the present application.

[0043] Figure 9 Another schematic diagram of a stator punching provided by an embodiment of the present application.

[0044] Figure 10 Another schematic diagram of a stator core provided by an embodiment of the present application. Detailed implementation manners

[0045] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0046] The "equal / to be equal to" involved in the present application is not equal / to be equal to in a strict sense, but within the allowable error range. "Parallel" is not parallel in a strict sense, but within the allowable error range. "Perpendicular" is not perpendicular in a strict sense, but within the allowable error range.

[0047] In the embodiments of the present application, the same reference numeral represents the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings. The reference numeral is equally applicable to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0048] Figure 1A schematic diagram of an electric vehicle provided by an embodiment of the present application. The electric vehicles provided by the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, range extended electric vehicles, plug-in hybrid electric vehicles, or new energy vehicles, etc. Among them, a pure electric vehicle is also called a pure electric vehicle / battery electric vehicle, or simply referred to as a pure EV / battery EV. A hybrid electric vehicle is also called a hybrid electric vehicle, or simply referred to as an HEV. A range extended electric vehicle is also called a range extended electric vehicle, or simply referred to as an REEV. A plug-in hybrid electric vehicle is also called a plug-in hybrid electric vehicle, or simply referred to as a PHEV. A new energy vehicle is also called a new energy vehicle, or simply referred to as an NEV.

[0049] As Figure 1 shown, the electric vehicle 1 includes a powertrain 10 and a power battery 20. Among them, the powertrain 10 is used to receive power supply from the power battery 20 and convert electrical energy into mechanical energy to drive the wheels of the electric vehicle 1.

[0050] In one embodiment, the electric vehicle 1 includes two powertrains 10. One of the two powertrains 10 is used to drive the two front wheels of the electric vehicle 1, and the other of the two powertrains 10 is used to drive the two rear wheels of the electric vehicle 1. In one embodiment, the electric vehicle 1 includes four powertrains 10, and the four powertrains 10 are used to drive the four wheels of the electric vehicle 1 respectively.

[0051] As Figure 1 shown, the electric vehicle 1 further includes a power supply module 30. Among them, the power supply module 30 is used to receive power supply from an external power supply 40 to charge the power battery 20. In one embodiment, the external power supply 40 is an AC power grid, an AC charging pile, or a DC charging pile. The power supply module 30 includes at least one of a DC charger or an AC charger.

[0052] The embodiments of the present application also provide a powertrain. In one embodiment, the powertrain includes a drive motor and a speed reducer. Among them, the motor shaft of the drive motor is used for driving connection with the input shaft of the speed reducer and driving the wheels of the electric vehicle through the speed reducer.

[0053] As Figure 1 shown, the powertrain 10 provided by the embodiments of the present application includes a drive motor 100 and a speed reducer 200. Among them, the drive motor 100 is used to drive the wheels of the electric vehicle 1 through the speed reducer 200.

[0054] In one embodiment, the powertrain further includes a motor controller, which is used to control the drive motor to drive the wheels of the electric vehicle through a speed reducer.

[0055] As Figure 1 shown, the powertrain 10 provided in the embodiment of the present application further includes a motor controller 300. The motor controller 300 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 drive motor 100 to drive the wheels of the electric vehicle 1 through the speed reducer 200.

[0056] In one embodiment, the powertrain includes two drive motors, two motor controllers, and two speed reducers. Among them, the two motor controllers are respectively used to control the two drive motors. The two drive motors respectively drive the two wheels of the electric vehicle through the two speed reducers. That is to say, the embodiment of the present application also provides a dual-motor powertrain. In one embodiment, the dual-motor powertrain is also called a dual-drive powertrain.

[0057] Figure 2 This is a schematic diagram of the drive motor provided in the embodiment of the present application. As Figure 2 shown, the drive motor 100 includes a motor stator 110, a motor rotor 120, and a motor shaft 130. Among them, the motor stator 110 is used to accommodate the motor rotor 120, and the motor rotor 120 is used for transmission connection with the motor shaft 130. During the process of the motor controller 300 controlling the operation of the drive motor 100, the motor rotor 120 in the drive motor 100 rotates relative to the motor stator 110, and the motor rotor 120 drives the motor shaft 130 to rotate.

[0058] In the embodiment of the present application, as Figure 2 shown, the motor stator 110 of the drive motor 100 includes a stator core 111 and a stator winding 112. Among them, the stator core 111 is used to wind the stator winding 112. The stator winding 112 is used to receive the alternating current provided by the motor controller 300 to generate a magnetic field to drive the motor rotor 120.

[0059] Figure 3 This is a schematic diagram of the stator core in the motor stator of the drive motor provided in the embodiment of the present application. As Figure 3 shown, the stator core 111 includes two end faces S1 and S2. Among them, the two end faces S1 and S2 are arranged back to back along the axial direction of the stator core 111.

[0060] In the embodiment of the present application, the axial direction of the stator core 111 can be understood as the axial direction of the drive motor 100, the axial direction of the motor shaft 130, the axial direction of the motor stator 110, the axial direction of the motor rotor 120, and the axial direction of the stator laminations 400 of the stator core 111.

[0061] In one embodiment, the stator winding 112 includes a three-phase winding and three winding leads. Among them, each phase winding in the three-phase winding includes multiple groups of windings connected in parallel, and the multiple groups of windings connected in parallel in each phase winding receive an alternating current of one phase through a winding lead. In one embodiment, the multiple winding leads are winding busbars.

[0062] As Figure 3 shown, the stator core 111 includes a central hole O. Among them, the central hole O is used to accommodate the motor rotor 120. Along the axial direction of the stator core 111, the central hole O of the stator core 111 penetrates through the two end faces S1 and S2 of the stator core 111.

[0063] In one embodiment, the stator core 111 further includes an inner peripheral surface S3 and an outer peripheral surface S4, and the inner peripheral surface S3 and the outer peripheral surface S4 are arranged opposite to each other along the radial direction of the stator core 111. Among them, the inner peripheral surface S3 of the stator core 111 is the hole wall of the central hole O.

[0064] In the embodiment of the present application, the radial direction of the stator core 111 can be understood as the radial direction of the driving motor 100, the radial direction of the motor shaft 130 in the driving motor 100, the radial direction of the motor stator 110, the axial direction of the motor rotor 120, and the radial direction of the stator punching 400 of the stator core 111.

[0065] As Figure 3 shown, the inner peripheral surface S3 of the stator core 111 includes a plurality of winding slots G, and each winding slot G penetrates through the two end faces S1 and S2 of the stator core 111. The plurality of winding slots G of the stator core 111 are arranged at intervals along the circumferential direction of the stator core 111, and the plurality of winding slots G are used to accommodate the stator winding 112. The stator winding 112 of the motor stator 110 passes through the plurality of winding slots G of the stator core 111 and winds around the stator core 111, and the stator windings 112 of the motor stator 110 are respectively exposed from the two end faces S1 and S2 of the stator core 111.

[0066] In the embodiment of the present application, the circumferential direction of the stator core 111 can be understood as the circumferential direction of the driving motor 100, the circumferential direction of the motor shaft 130 in the driving motor 100, the circumferential direction of the motor stator 110, the circumferential direction of the motor rotor 120, and the circumferential direction of the stator punching 400 of the stator core 111.

[0067] The stator core 111 includes a plurality of stator punchings 400, and the plurality of stator punchings 400 in the stator core 111 are arranged adjacent to each other in sequence along the axial direction of the stator core 111.

[0068] Figure 4 For a schematic diagram of the stator punching provided in the embodiment of the present application. As Figure 4As shown, each stator punching 400 includes a central hole O1. The central hole O1 of each stator punching 400 penetrates each stator punching 400 along the axial direction of the stator punching 400. The central holes O1 of the multiple stator punchings 400 of the stator core 111 communicate with each other along the axial direction of the stator punching 400 to form the central hole O of the stator core 111. Thus, the central hole O of the stator core 111 penetrates the multiple stator punchings 400 of the stator core 111 along the axial direction of the drive motor 100.

[0069] As Figure 4 shown, each stator punching 400 includes a plurality of winding slots G1. Each winding slot G1 of each stator punching 400 communicates with the central hole O1 of each stator punching 400. Each winding slot G1 of each stator punching 400 penetrates each stator punching 400 along the axial direction of the stator punching 400. The multiple winding slots G1 of the multiple stator punchings 400 of the stator core 111 communicate with each other along the axial direction of the stator punching 400 to form the multiple winding slots G of the stator core 111. Thus, each winding slot G of the stator core 111 penetrates the multiple stator punchings 400 of the stator core 111 along the axial direction of the drive motor 100.

[0070] During the process of stacking the multiple stator punchings 400 along the axial direction of the stator punching 400 to form the stator core 111, it is difficult to ensure that the multiple stator punchings 400 maintain the correct positions during stacking, resulting in misalignment or offset of the multiple winding slots G1 of the multiple stator punchings 400 along the circumferential direction of the stator punching 400, thereby causing a decrease in the performance of the drive motor 100.

[0071] As Figure 4 shown, the outer peripheral surface 410 of each stator punching 400 includes multiple groove groups 420 of different types, and the multiple groove groups 420 are distributed at intervals along the circumferential direction of the stator core 111. Each groove group 420 includes a positioning groove 421. The positioning groove 421 of the stator punching 400 is used to detect whether the winding slots G of the multiple stator punchings 400 are correctly assembled after the multiple stator punchings 400 of the stator core 111 are stacked along the circumferential direction of the stator core 111.

[0072] Among them, the intervals between the two positioning grooves 421 in two adjacent groove groups 420 are the same. Thus, after the multiple stator punchings 400 of the stator core 111 are laminated along the axial direction of the stator core 111, by checking whether the positioning grooves 421 in two adjacent stator punchings 400 of the stator core 111 are arranged along the axial direction of the stator core 111 according to a preset rule, it can be detected whether the winding slots G of two adjacent stator punchings 400 of the stator core 111 are aligned along the axial direction of the stator core 111. Furthermore, it does not require a large amount of human input, which is beneficial to reducing the production cost of the drive motor 100 and ensuring that the performance of the drive motor 100 is not affected.

[0073] In one embodiment, the positioning grooves 421 in the groove group 420 of each stator punching 400 are distributed between two adjacent oil holes 430. This helps to improve the structural utilization rate of the stator punching 400.

[0074] In one embodiment, as Figure 4 shown, the angle between the center lines in the circumferential direction of two adjacent oil holes 430 of each stator punching 400 and the angle between the center lines in the circumferential direction of two stator grooves 421 in two adjacent groove groups 420 of each stator punching 400 are both a. Thus, by rotating two adjacent stator punchings 400 arranged adjacent to each other by an angle a in the circumferential direction of the stator core 111, the two positioning grooves 421 in different groove groups 420 of two adjacent stator punchings 400 are aligned in the circumferential direction of the stator core 111, and the two adjacent oil holes 430 of two adjacent stator punchings 400 are aligned in the circumferential direction of the stator core 111.

[0075] Figure 5 This is another schematic diagram of the stator core provided by the embodiment of the present application. As Figure 5 shown, the stator core 111 includes a first stator core 1111 and a second stator core 1112, and the first stator core 1111 and the second stator core 1112 are arranged adjacent to each other along the axial direction of the stator core 111.

[0076] In one embodiment, the first stator core 1111 is arranged at the end of the stator core 111 along the axial direction of the stator core 111, and the stator winding 112 is exposed on the end face of the first stator core 1111 facing away from the second stator core 1112. In one embodiment, the number of the first stator cores 1111 is two, and the two first stator cores 1111 are arranged on both sides of the second stator core 1112 along the axial direction of the stator core 111.

[0077] As Figure 4 shown, each stator punching 400 further includes a plurality of oil holes 430, and the plurality of oil holes 430 of each stator punching 400 are distributed at intervals in the circumferential direction of the stator core 111. As Figure 5 shown, each oil hole 430 of each stator punching 400 of the first stator core 1111 is used to communicate with an oil hole 430 of another adjacent stator punching 400 to form an oil outlet channel 140, and each oil outlet channel 140 is used to output cooling oil to dissipate heat from the stator winding 112, thereby improving the heat dissipation effect of the drive motor 100. Each oil hole 430 of each stator punching 400 of the second stator core 1112 is used to communicate with an oil hole 430 of another adjacent stator punching 400 to form a coolant channel 150, and each coolant channel 150 is used to convey coolant to an oil outlet channel 140.

[0078] In order for the coolant output from each oil outlet channel 140 of the first stator core 1111 to spray toward the stator winding 112, a plurality of stator laminations 400 of the first stator core 1111 can be stacked circumferentially along the stator core 111 so that the oil outlet channels 140 of the first stator core 1111 form specific oil outlet channels. For example, the communication directions of the plurality of oil holes 430 of the plurality of stator laminations 400 of the first stator core 1111 intersect the axial direction of the stator core 111, so that the coolant in the oil outlet channels 140 of the first stator core 1111 can spray toward the stator winding 112. However, during the process of stacking the plurality of stator laminations 400 of the first stator core 1111 circumferentially along the stator core 111, it is difficult to ensure that the plurality of stator laminations 400 of the first stator core 1111 can be stacked circumferentially along the stator core 111 in a desired manner, resulting in the plurality of oil channels 140 of the plurality of stator laminations 400 of the first stator core 1111 not being able to form specific oil outlet channels. Furthermore, a large amount of manpower input is required, increasing the production cost of the drive motor.

[0079] As Figure 4 shown, each groove group 420 on the outer peripheral surface 410 of each stator lamination 400 further includes a marking groove 422. The marking groove 422 of each groove group 420 of each stator lamination 400 is used to detect whether the plurality of oil holes 430 of two adjacent stator laminations 400 of the first stator core 1111 form a specific oil outlet channel. Thus, after the plurality of stator laminations 400 of the first stator core 1111 are stacked circumferentially along the stator core 111, according to whether the different types of groove groups 420 of the plurality of stator laminations 400 of the first stator core 1111 can be arranged according to a preset rule, it can be detected whether the oil outlet channels 140 of the first stator core 1111 form specific oil outlet channels. Furthermore, a large amount of manpower input is not required, which is beneficial to reducing the production cost of the drive motor 100 and ensuring that the heat dissipation performance of the drive motor 100 is not affected. Furthermore, it is beneficial to improve the performance of the power assembly 10 and the cruising range of the electric vehicle 1.

[0080] In addition, a matching key tooling is made according to the preset rule of arranging the marking slots 422 of multiple different types of groove groups 420 of the multiple stator punching sheets 400 of the first stator core 1111. When the stator core 100 lies flat, the key tooling is pushed into the marking slots 422 of the multiple different types of groove groups 420 of the multiple stator punching sheets 400 of the first stator core 1111 along the radial direction of the stator core 111 from the outer peripheral surface S4 of the stator core 100. If the key tooling matches the marking slots 422 of the multiple different types of groove groups 420 of the multiple stator punching sheets 400 of the first stator core 1111, it can be detected that the multiple oil holes 430 of the multiple stator punching sheets 400 are correctly assembled after the multiple stator punching sheets 400 of the first stator core 1111 are stacked. Thus, not only is no human input required, but also the key tooling can quickly and accurately detect the stator cores 111 of the same type. Furthermore, it is beneficial to reduce the production cost of the drive motor 100.

[0081] In one embodiment, when each stator punching sheet 400 in the first stator core 1111 is arranged in a circumferentially offset manner with respect to another adjacent stator punching sheet 400 along the circumference of the stator core 111, the same type of groove groups 420 in two stator punching sheets 400 of the first stator core 1111 are arranged in a circumferentially offset manner along the circumference of the stator core 111, the marking slots 422 of the same type of groove groups 420 in two adjacent stator punching sheets 400 are arranged in an axially offset manner along the axis of the stator core 111, and the positioning slots 421 of different types of groove groups 420 in two adjacent stator punching sheets 400 are arranged in an axially aligned manner along the axis of the stator core 111, it can be regarded that after the multiple stator punching sheets 400 of the first stator core 1111 are stacked along the circumference of the stator core 111, the multiple different types of groove groups 420 of the multiple stator punching sheets 400 of the first stator core 1111 can be arranged according to the preset rule.

[0082] When the multiple stator punching sheets 400 of the first stator core 1111 are stacked along the circumference of the stator core 111, if the positioning slots 421 of different types of groove groups 420 in two adjacent stator punching sheets 400 of the first stator core 1111 are arranged in an axially aligned manner along the axis of the stator core 111, the winding slots G of the multiple stator punching sheets 400 are correctly assembled after the multiple stator punching sheets 400 of the first stator core 1111 are stacked. If the marking slots 422 of different types of groove groups 420 in two adjacent stator punching sheets 400 of the first stator core 1111 are arranged in an axially offset manner along the axis of the stator core 111, the multiple oil holes 430 of the multiple stator punching sheets 400 are correctly assembled after the multiple stator punching sheets 400 of the first stator core 1111 are stacked.

[0083] In one embodiment, when each stator lamination 400 in the first stator core 1111 is used to partially block a plurality of oil holes 430 of another adjacent stator lamination 400, each oil hole 430 of each stator lamination 400 in the first stator core 1111 is used to partially communicate with an oil hole 430 of another adjacent stator lamination 400. In other words, the communication direction of the plurality of oil holes 430 of the plurality of stator laminations 400 of the first stator core 1111 intersects with the axial direction of the stator core 111. Thus, after the plurality of stator laminations 400 of the first stator core 1111 are stacked in a circumferential direction of the stator core 111, the coolant in the oil outlet channel of the first stator core 1111 can be sprayed toward the stator winding 112. Furthermore, after the plurality of stator laminations 400 of the first stator core 1111 are stacked in a circumferential direction of the stator core 111, the oil outlet channel 140 of the first stator core 1111 can form a specific oil outlet channel.

[0084] Among them, the communication area of the oil holes in two adjacent stator laminations 400 in the first stator core 1111 is greater than or equal to the blocking area. Thus, not only can it be ensured that the oil outlet channel 140 of the first stator core 1111 can form a specific oil outlet channel after the plurality of stator laminations 400 of the first stator core 1111 are stacked in a circumferential direction of the stator core 111, but also it can be ensured that the coolant in the specific oil outlet channel formed by the oil outlet channel 140 of the first stator core 1111 is relatively sufficient.

[0085] In one embodiment, the interval d between the marking groove 422 and the positioning groove 421 in two adjacent groove groups 420 is different. When two adjacent stator laminations 400 arranged adjacent to each other are rotated by a certain angle, such as the a angle described above, in a circumferential direction of the stator core 111, the marking grooves 422 of two types of adjacent groove groups 420 of two adjacent stator laminations 400 arranged adjacent to each other in the first stator core 1111 are arranged in a staggered manner along the axial direction of the stator core 111 according to a certain rule, and thus it can be detected whether the plurality of oil holes 430 of the plurality of stator laminations 400 of the first stator core 1111 are stacked in a circumferential direction of the stator core 111 in a desired manner to form a specific oil outlet channel.

[0086] In one embodiment, the positioning groove 421 and the marking groove 422 in each groove group 420 are distributed on both sides of an oil hole 430. Thus, the assembly process of the plurality of stator laminations 400 of the first stator core 1111 can be simplified, and further it is beneficial to reduce the production cost of the drive motor 100.

[0087] In one embodiment, the interval between the marking groove 422 and the positioning groove 421 in the plurality of groove groups 420 in each stator lamination 400 increases sequentially in a clockwise direction. For example, as Figure 4As shown, in each stator punching sheet 400, multiple groove groups 420a - 420h are arranged in sequence in the clockwise direction. According to the arrangement sequence of the multiple groove groups 420a - 420h, the intervals between the marked grooves 422 and the positioning grooves 421 in the multiple groove groups 420a - 420h increase in sequence.

[0088] In one embodiment, for each groove group 420 in each stator punching sheet 400, the increase value of the interval between the marked groove 422 and the positioning groove 421 is the same as that between the marked groove 422 and the positioning groove 421 in another adjacent groove group 420 along the counterclockwise direction. In other words, in the reverse direction of the arrangement sequence of the multiple groove groups 420a - 420h, the increase value of the interval between the marked groove 422 and the positioning groove 421 in any two adjacent different types of groove groups 420 is the same.

[0089] When two adjacent stator punching sheets 400 are rotated by a certain angle, such as the α angle described above, along the circumferential direction of the stator core 111, the misalignment amounts of the marked grooves 422 of two adjacent arranged groove groups 420 in any two adjacent arranged stator punching sheets 400 in the first stator core 1111 along the axial direction of the stator core 111 are the same, which is conducive to accelerating the progress of detecting whether the multiple stator punching sheets 400 of the first stator core 1111 are stacked correctly.

[0090] Figure 6 For Figure 5 an enlarged schematic view of part B of the stator punching sheet shown in. In one embodiment, as Figure 6 shown, the shape of the positioning groove 421 in each groove group 420 of each stator punching sheet 400 is different from that of the marked groove 422. The groove width W1 of the positioning groove 421 in each groove group 420 of each stator punching sheet 400 is greater than the groove width W2 of the marked groove 422, and the groove depth H1 of the positioning groove 421 in each groove group 420 of each stator punching sheet 400 is greater than the groove depth H2 of the marked groove 422. Thereby, the distinguishability between the marked groove 422 and the positioning groove 421 in each groove group 420 can be increased, which is further conducive to accelerating the progress of detecting whether the multiple stator punching sheets 400 of the first stator core 1111 are stacked correctly.

[0091] In one embodiment, as Figure 6 shown, the shapes of the marked grooves 422 in the multiple groove groups 420 of each stator punching sheet 400 are the same, and the shapes of the positioning grooves 421 in the multiple groove groups 420 of each stator punching sheet 400 are the same. Thereby, the distinguishability of the marked grooves 422 and the positioning grooves 421 in each groove group 420 can be increased, which is further conducive to accelerating the progress of detecting whether the multiple stator punching sheets 400 of the first stator core 1111 are stacked correctly.

[0092] Figure 7 ForFigure 3 An enlarged schematic view of part A of the stator core shown in the figure. In one embodiment, as Figure 7 shown, the first stator core 1111 includes 8 stator laminations 400. The outer peripheral surface of each stator lamination 400 of the first stator core 1111 includes 8 groove groups 420. The minimum interval d between the marked groove 422 and the positioning groove 421 in the groove group 420 of each stator lamination 400 of the first stator core 1111 min is equal to 7 mm, and the maximum interval d max is equal to 14 mm. The increase value △d of the interval between the marked groove 422 and the positioning groove 421 in each groove group 420 of each stator lamination 400 relative to the interval between the marked groove 422 and the positioning groove 421 in another adjacent groove group 420 along the counterclockwise direction is 1 mm.

[0093] Combined with Figure 7 shown, when two adjacent stator laminations 400 arranged adjacent to each other are rotated by a certain angle, such as the a angle described above, along the circumferential direction of the stator core 111, the misalignment amount of the marked grooves 422 of two adjacent different groove groups 420 of two adjacent stator laminations 400 of the first stator core 1111 arranged axially along the stator core 111 is 1 mm, and the marked grooves 422 of two adjacent different groove groups 420 of two adjacent stator laminations 400 of the first stator core 1111 communicate along the X direction. The positioning grooves 421 of different groove groups 420 of multiple stator laminations 400 of the first stator core 1111 are arranged axially aligned along the stator core 111. Among them, the X direction is not parallel to the axial direction of the stator core 111.

[0094] In one embodiment, the increase value of the interval between the marked groove 422 and the positioning groove 421 in each groove group 420 of each stator lamination 400 relative to the interval between the marked groove 422 and the positioning groove 421 in another adjacent groove group 420 along the counterclockwise direction is half of the dimension of the stator groove 421 along the circumferential direction of the stator lamination 400.

[0095] Combined with Figure 7 shown, when two adjacent stator laminations 400 arranged adjacent to each other are rotated by a certain angle, such as the a angle described above, along the circumferential direction of the stator core 111, if one of the multiple stator laminations 400 of the first stator core 1111 has a circumferential misalignment along the stator core 111, the misalignment amount of a marked groove 422 of the misaligned stator lamination 400 and a marked groove 422 of its adjacent stator lamination arranged axially along the stator core 111 is greater than 1 mm, so that the marked grooves 422 in multiple groove groups 420 of the first stator core 1111 will not be able to communicate, which is beneficial to accelerating the progress of detecting whether the multiple stator laminations 400 of the first stator core 1111 are stacked correctly.

[0096] In one embodiment, the shapes of the marking grooves 422 in two adjacent groove groups 420 are different. When two adjacent stator laminations 400 are rotated by a certain angle, such as the angle a described above, in the circumferential direction of the stator core 111, the marking grooves 422 of two different types of groove groups 420 in two adjacent stator laminations 400 in the first stator core 1111 are arranged in a staggered pattern according to a certain rule in the axial direction of the stator core 111, so as to detect whether the multiple stator laminations 400 of the first stator core 1111 are stacked in the circumferential direction of the stator core 111 in a desired manner to form a specific oil outlet channel.

[0097] Figure 8 A schematic diagram of multiple groove groups provided by an embodiment of the present application. In one embodiment, as Figure 8 shown in (a) to Figure 8 shown in (h) in

[0098] Figure 9 Another schematic diagram of the stator lamination provided by an embodiment of the present application. In one embodiment, in each stator lamination 400 of the first stator core 1111, the marking groove 422 in each groove group 420 is communicated with the positioning groove 421, and the communication modes of the marking grooves 422 in two adjacent groove groups 420 in each stator lamination 400 with the positioning groove 421 are different. Thereby, the processing technology of each stator lamination 400 can be simplified, and the recognition degree of the marking grooves 422 in two adjacent groove groups 420 can be increased.

[0099] In one embodiment, as Figure 8 shown in (a) in Figure 8 shown in (b) in Figure 8 shown in (d) in Figure 8 shown in (f) in Figure 8 shown in (h) in

[0100] In one embodiment, as Figure 8 shown in (c) in Figure 8as shown in (e) in Figure 8 as shown in (g) in

[0101] Figure 10 Another schematic diagram of the stator core provided by the embodiment of the present application. In one embodiment, as Figure 10 shown, the first stator core 1111 includes 8 stator laminations 400, and the outer peripheral surface of each stator lamination 400 of the first stator core 1111 includes 8 groove groups 420a - 420h. Combining Figure 10 shown, when two adjacent stator laminations 400 are rotated by a certain angle, such as the a angle described above, along the circumferential direction of the stator core 111, the different types of groove groups 420 of the multiple stator laminations 400 of the first stator core 1111 communicate axially along the stator core 111. The projections of the different types of groove groups 420 of the multiple stator laminations 400 of the first stator core 1111 along the axial direction of the stator core 111 do not completely overlap, and the positioning grooves 421 of the different types of groove groups 420 of the multiple stator laminations 400 of the first stator core 1111 are aligned axially along the stator core 111.

[0102] It should be noted that if the projections of the different types of groove groups 420 of the multiple stator laminations 400 of the first stator core 1111 along the axial direction of the stator core 111 do not completely overlap, it is regarded as the same type of groove groups 420 among the multiple stator laminations 400 of the first stator core 1111 being misaligned circumferentially along the stator core 111.

[0103] In one embodiment, the distances between the multiple oil holes 430 in each stator lamination 400 and the axis of the stator core 111 increase sequentially in the clockwise direction. For example, as Figure 4 and Figure 9 shown, the multiple oil holes 430a - 430r of the stator lamination 400 are arranged at intervals in the clockwise direction, and the distances between the multiple oil holes 430a - 430r of the stator lamination 400 and the axis of the stator core 111 increase sequentially.

[0104] Design a type of stator punching sheet 400. Stacking multiple stator punching sheets 400 of the same type circumferentially along the stator core 111 can form a specific oil outlet channel of the first stator core 1111. Thereby, the processing technology of the stator punching sheet 400 and the assembly technology of multiple stator punching sheets 400 can be simplified, which is conducive to reducing the production cost of the drive motor 100.

[0105] In the embodiment of the present application, the clockwise direction is different with respect to different end faces of the stator punching sheet 400.

[0106] In one embodiment, the number of groove groups 420 in each stator punching sheet 400 is less than the number of oil holes 430. The number of stator punching sheets 400 forming a specific oil outlet channel in the stator core 111 does not need to be excessive. Therefore, the number of stator punching sheets 400 that need to be detected for correct circumferential stacking along the stator core 111 in the stator core 111 is not large. The number of oil holes 430 in each stator punching sheet 400 determines the heat dissipation effect of the stator winding 112. Therefore, a large number of oil holes 430 need to be provided on each stator punching sheet 400. Thus, on the premise of ensuring the correct circumferential stacking of multiple stator punching sheets 400 of the stator core 111 and not affecting the heat dissipation effect of the stator winding 112, setting the number of groove groups 420 in each stator punching sheet 400 to be less than the number of oil holes 430 can simplify the processing technology of the stator punching sheet 400 and the assembly technology of multiple stator punching sheets 400, which is conducive to reducing the production cost of the drive motor 100.

[0107] In one embodiment, as Figure 7 and Figure 10 shown, the same type of groove groups 420 of two adjacent stator punching sheets 400 in the second stator core 1112 are arranged axially aligned along the stator core 111.

[0108] Since the multiple oil outlet channels 140 of the first stator core 1111 distributed axially at the ends in the stator core 111 need to dissipate heat from the stator winding 112, stacking the multiple stator punching sheets 400 of the first stator core 1111 distributed axially at the ends in the stator core 111 circumferentially along the stator core 111 does not require stacking the multiple stator punching sheets 400 of each stator core of the stator core 111 circumferentially along the stator core 111. Thereby, the assembly technology of the multiple stator punching sheets 400 of the stator core 111 can be simplified, which is conducive to reducing the production cost of the drive motor 100.

[0109] In addition, by determining whether the same type of groove groups 420 in two adjacent stator laminations 400 of each stator core 110 of the motor stator 110 are arranged in a circumferential dislocation along the stator core 111 or are arranged axially aligned along the stator core 111, it is detected whether the multiple stator laminations 400 of each stator core 111 are correctly assembled, thus eliminating the need for a large amount of manual labor input, which is conducive to reducing the production cost of the drive motor 100 and ensuring that the heat dissipation performance of the drive motor 100 is not affected.

[0110] In one embodiment, the communication area of the oil holes 430 in two adjacent stator laminations 400 in the second stator core 1112 is larger than the communication area of the oil holes 430 in two adjacent stator laminations 400 in the first stator core 1111. In other words, the angle between the communication directions of the multiple oil holes 430 in two adjacent stator laminations 400 in the first stator core 1111 and the axis of the stator core 111 is greater than the angle between the communication directions of the multiple oil holes 430 in two adjacent stator laminations 400 in the second stator core 1112 and the axis of the stator core 111. Thereby, it can be ensured that the coolant in each coolant channel 150 of the second stator core 1112 smoothly flows into an oil outlet channel 140 of the first stator core 1111, and is quickly sprayed onto the stator winding 112 through each oil outlet channel 140 of the first stator core 1111 for heat dissipation, which is conducive to improving the heat dissipation effect of the coolant on the stator winding 112.

[0111] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within 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. A driving motor, characterized in that: The drive motor comprises a motor rotor and a motor stator, the motor stator comprises a stator core and a stator winding, the central hole of the stator core is used to accommodate the motor rotor, the multiple winding slots of the stator core are used to accommodate the stator winding, the multiple stator punchings in the stator core are arranged adjacent to each other in the axial direction of the stator core, the central hole and the winding slots penetrate the multiple stator punchings along the axial direction of the drive motor, wherein: Each of the stator punching sheets comprises a plurality of oil holes, and the plurality of oil holes of each of the stator punching sheets are distributed at intervals along the circumference of the stator core; The outer peripheral surface of each stator punching sheet includes a plurality of groove groups of different types, and the plurality of groove groups are distributed at intervals along the circumference of the stator core. Each groove group includes a positioning groove and a marking groove. The intervals between the two positioning grooves in two adjacent groove groups are the same, and the shapes of the marking grooves in two adjacent groove groups are different or the intervals between the marking groove and the positioning groove are different.

2. The drive motor according to claim 1, characterized in that: The stator core includes a first stator core, each of the stator punching sheets in the first stator core is arranged in a circumferentially staggered manner with another adjacent stator punching sheet, the groove groups of the same type in two adjacent stator punching sheets are arranged in a circumferentially staggered manner, the marking grooves of the groove groups of the same type in two adjacent stator punching sheets are arranged in an axially staggered manner, and the positioning grooves of the groove groups of different types in two adjacent stator punching sheets are aligned in the axial direction of the stator core.

3. The drive motor according to claim 2, characterized in that: Each of the stator punching sheets in the first stator core is used to partially block the multiple oil holes of another adjacent stator punching sheet, and each of the oil holes in each of the stator punching sheets in the first stator core is used to partially connect with one of the oil holes in another adjacent stator punching sheet to form an oil outlet channel, and each of the oil outlet channels is used to output cooling oil to dissipate heat from the stator winding, and the connection area of ​​the oil holes in two adjacent stator punching sheets in the first stator core is greater than or equal to the blocked area.

4. The drive motor according to claim 2 or 3, characterized in that: The stator core includes a second stator core, the first stator core and the second stator core are arranged adjacent to each other in the axial direction of the stator core, and the groove groups of the same type in two adjacent stator punching sheets in the second stator core are aligned in the axial direction of the stator core.

5. The driving motor according to claim 4, characterized in that: The multiple oil holes of one of the two adjacent stator punchings in the second stator core are respectively connected to the multiple oil holes of the other stator punching to form a plurality of coolant channels, each of the coolant channels is used to transport coolant to an oil outlet channel of the first stator core, and the connecting area of ​​the oil holes in the two adjacent stator punchings in the second stator core is greater than the connecting area of ​​the oil holes in the two adjacent stator punchings in the first stator core.

6. The drive motor according to any one of claims 1 to 5, characterized in that: The spacing between the multiple oil holes in each stator punching sheet and the axis of the stator core increases successively in the clockwise direction, the number of the groove groups in each stator punching sheet is less than the number of the oil holes, and the positioning grooves in the groove group of each stator punching sheet are distributed between two adjacent oil holes.

7. The driving motor according to claim 6, characterized in that: The positioning grooves of the different types of the groove groups in two adjacent stator punching sheets in the first stator core of the stator core are connected along the axial direction of the stator core, wherein: Each of the marking grooves of each of the stator punching sheets is used to partially connect to a marking groove of another adjacent stator punching sheet.

8. The driving motor according to claim 7, characterized in that: The positioning grooves and the marking grooves in each groove group are distributed on both sides of an oil hole, and the intervals between the marking grooves and the positioning grooves in the multiple groove groups in each stator punching sheet increase successively in a clockwise direction, and the increase value of the interval between the marking grooves and the positioning grooves in each groove group is the same as that of the interval between the marking grooves and the positioning grooves in another groove group adjacent in a counterclockwise direction.

9. The drive motor according to claim 7 or 8, characterized in that: The shape of the positioning groove in each groove group in each stator punching sheet is different from the shape of the marking groove, the groove width of the positioning groove in each groove group in each stator punching sheet is greater than the groove width of the marking groove, and the groove depth of the positioning groove in each groove group in each stator punching sheet is greater than the groove depth of the marking groove.

10. The driving motor according to any one of claims 7 to 9, characterized in that: The marking grooves in the plurality of groove groups in each of the stator punching sheets have the same shape, and the positioning grooves in the plurality of groove groups in each of the stator punching sheets have the same shape.

11. The driving motor according to claim 6, characterized in that: The marking groove in each groove group in each stator punching sheet in the first stator core of the stator core is connected to the positioning groove, and the marking groove in two adjacent groove groups in each stator punching sheet is connected in a different manner to the positioning groove.

12. The driving motor according to claim 11, characterized in that: The marking grooves in the groove group are distributed at the groove bottom of the positioning groove, and at least one of the shapes of the marking grooves in different types of groove groups or the distribution positions at the groove bottom of the positioning groove is different.

13. The drive motor according to claim 11 or 12, characterized in that: The marking grooves in the groove group are distributed at the notches of the positioning grooves, and at least one of the shapes of the marking grooves in different types of groove groups or the distribution positions of the notches of the positioning grooves is different.

14. A powertrain, characterized in that: The power assembly includes a reducer and a drive motor as claimed in any one of claims 1 to 13, wherein a motor shaft of the drive motor is used for transmission connection with an input shaft of the reducer.

15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain is used to drive the wheels through the transmission mechanism.

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