Stator assembly, motor, electric drive assembly and vehicle

Abstract

The invention discloses a stator assembly, a motor, an electric drive assembly and a vehicle. The stator assembly comprises a stator core; the at least one phase of stator winding is wound on the stator core, each phase of stator winding is provided with a plurality of branches, and each branch is provided with a lead; the busbar assembly is arranged on one side of the stator iron core in the axial direction of the stator iron core and electrically connected with the lead wires, and the inner side and the outer side, in the radial direction of the stator iron core, of the busbar assembly are electrically connected with the lead wires. The busbar assembly is arranged on the axial side, the radial occupied space of the motor is saved, and when a plurality of branches are arranged, the leads are dispersedly connected to the inner side and the outer side of the busbar assembly, so that the joints of the two sides of the busbar assembly and the leads are stressed, and the reliability of the motor is improved. And the fracture risk caused by insufficient connection strength of the busbar assembly and the lead due to single-side connection is avoided, and the motor performance is further influenced.

Description

Technical Field

[0001] The present disclosure relates to the field of motor technology, and in particular, to a stator assembly, a motor, an electric drive assembly, and a vehicle. Background Art

[0002] As the power of the motor increases, the number of winding branches increases, and the number of leads that need to be connected to the motor bus assembly also increases, which greatly increases the difficulty of connecting the bus and the leads. The quality of the connection between the bus and the leads will directly affect the performance of the motor. Summary of the Invention

[0003] An object of the present disclosure is to provide a stator assembly, a motor, an electric drive assembly, and a vehicle to at least partially solve the problems existing in the related art.

[0004] According to a first aspect of an embodiment of the present disclosure, a stator assembly is provided, comprising: a stator core; at least one phase of a stator winding wound around the stator core and configured so that each phase of the stator winding has a plurality of branches, each branch having a lead; and a busbar assembly, arranged on one side of the stator core along the axial direction of the stator core and electrically connected to the lead, wherein the lead is electrically connected to both the inner and outer sides of the busbar assembly along the radial direction of the stator core.

[0005] Optionally, each phase of the stator winding has an even number of branches, and the number of the leads connected to the inner and outer sides of the busbar assembly is the same.

[0006] Optionally, the multiple branches of the stator winding are constructed as multi-layer coils arranged along the radial direction, the lead connected to the inner side of the busbar assembly is the inner lead, the lead connected to the outer side of the busbar assembly is the outer lead, and the coil layer where the inner lead is located is located in the inner layer of the coil layer where the outer lead is located.

[0007] Optionally, the number of phases of the stator winding is b, each phase of the stator winding has a branches, the busbar assembly includes a main body electrical conduction portion, the main body electrical conduction portion extends along the circumferential direction, and the cross-sectional area of the main body electrical conduction portion is not less than a b is the cross-sectional area of the lead.

[0008] Optionally, the busbar assembly is configured such that, in an axial projection view of the stator assembly, the busbar assembly and the leads are both located within an outer contour of the stator winding.

[0009] Optionally, the lead includes a star point line, and the busbar assembly includes a star point connection plate, which is electrically connected to each of the star point lines respectively, wherein the star point connection plate is electrically connected to the star point line on the radial inner and outer sides of the stator core.

[0010] Optionally, the multiple branches of the stator winding are constructed as multi-layer coils arranged along the radial direction, the multi-layer coils in the same radial direction are same-slot coils, and the two star-point lines drawn out from the same-slot coils include an inner star-point line and an outer star-point line, the inner star-point line is drawn out from the first layer of coils in the direction from the inside to the outside, and the outer star-point line is drawn out from the second layer of coils in the direction from the outside to the inside.

[0011] Optionally, the multiple branches of the stator winding are constructed as multi-layer coils arranged along the radial direction, the multi-layer coils in the same radial direction are same-slot coils, and the two star-point lines led out from the same-slot coils include an inner star-point line and an outer star-point line, the inner star-point line is led out from the second layer of coils in the direction from the inside to the outside, and the outer star-point line is led out from the first layer of coils in the direction from the outside to the inside.

[0012] Optionally, the number of radially arranged coil layers formed by the multiple branches of the stator winding is eight or more.

[0013] Optionally, the stator assembly has a multi-phase stator winding, and the star point connecting plate is constructed as an integrated annular structure.

[0014] Optionally, the star-point connection plate includes a first main body electrical trace and a first star-point connection portion formed on an inner side of the first main body electrical trace, a gap is formed between an outer side of the first star-point connection portion and an inner side of the first main body electrical trace, and the star-point line is connected to the inner side of the first star-point connection portion; and / or, the star-point connection plate includes a first main body electrical trace and a second star-point connection portion formed on an outer side of the first main body electrical trace, a gap is formed between an inner side of the second star-point connection portion and an outer side of the first main body electrical trace, and the star-point line is connected to the outer side of the second star-point connection portion.

[0015] Optionally, the lead wire includes a lead wire, and the busbar assembly includes a terminal block, and the terminal block is electrically connected to each of the lead wires, wherein the inner side and the outer side of the terminal block along the radial direction are electrically connected to the lead wire.

[0016] Optionally, the lead includes a star point line, the busbar assembly includes a star point connection plate, and the terminal block is arranged on one side of the star point connection plate along the axial direction.

[0017] Optionally, the multiple branches of the stator winding are constructed as multi-layer coils arranged along the radial direction, the lead wires and the star line of each branch are located in the same radially arranged coil layer, and the coil layer where the lead wires of each branch are located is adjacent to the coil layer where the star line is located.

[0018] Optionally, the stator assembly has a b-phase stator winding, and the terminal block includes b layers of second main body electrical conduction parts arranged at intervals along the axial direction, and each layer of the second main body electrical conduction parts is connected to the lead wire of one phase of the stator winding.

[0019] Optionally, an axial distance between two adjacent layers of the second main body electrical conduction portions is 4 mm to 6 mm.

[0020] According to a second aspect of an embodiment of the present disclosure, a motor is provided, comprising a rotor and a stator assembly provided by the present disclosure.

[0021] Optionally, the power of the motor is not less than 300kW.

[0022] According to a third aspect of an embodiment of the present disclosure, an electric drive assembly is provided, comprising the motor provided by the present disclosure.

[0023] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the motor provided by the present disclosure or the electric drive assembly provided by the present disclosure.

[0024] Through the above technical solution, the bus assembly is set on one axial side, saving the radial space occupied by the motor. When there are multiple branches, the leads are distributed and connected to the inside and outside of the bus assembly, so that the connections with the leads on both sides of the bus assembly are subjected to force, avoiding the risk of breakage caused by insufficient connection strength between the bus assembly and the leads due to unilateral connection, thereby affecting the performance of the motor.

[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a stator assembly according to an exemplary embodiment.

[0027] Figure 2 yes Figure 1 A partial schematic diagram of .

[0028] Figure 3 is a schematic diagram of a stator assembly according to another exemplary embodiment.

[0029] Figure 4 yes Figure 3 A partial schematic diagram of .

[0030] Figure 5 FIG. 1 is a schematic diagram of a one-phase winding according to an exemplary embodiment.

[0031] Figure 6 FIG. 1 is a projection view of a stator core and a winding along an axial direction according to an exemplary embodiment.

[0032] Figure 7 yes Figure 6 A partial schematic diagram of .

[0033] Figure 8 is a schematic diagram of a star point connection plate according to an exemplary embodiment.

[0034] Figure 9 is a schematic diagram of a stator assembly according to an exemplary embodiment.

[0035] Figure 10 yes Figure 9 Explosive photos.

[0036] Figure 11 is a schematic diagram of a wiring socket according to an exemplary embodiment.

[0037] Description of Reference Numerals 100- stator core, 200- stator winding, 201- coil, 210- branch, 2101- first phase branch, 2102- second phase branch, 2103- third phase branch, 2100- lead, 211- star point line, 2111- inner star point line, 2112- outer star point line, 212- lead-out line, 2121- inner lead-out line, 2122- outer lead-out line, 3040- busbar assembly, 3141- main body power supply, 300- star point connection plate, 310- first main body power supply, 321- first star point connection part, 322- second star point connection part, 400- terminal block, 410- second main body power supply, 4101- phase connection part, 411- first lead-out line connection part, 412- second lead-out line connection part, 500- insulating paper. DETAILED DESCRIPTION

[0038] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0039] In the present disclosure, unless otherwise specified, the directional words used, such as "axial, radial, circumferential", are defined based on the stator assembly of the motor, "inside" and "outside" refer to the inside and outside of the contour of the corresponding component itself, and "first" and "second" are used to distinguish one component from another and have no order or importance.

[0040] Reference Figure 9 and Figure 10 The present disclosure provides a stator assembly comprising a stator core 100, at least one phase of stator winding 200, and a busbar assembly 3040. The stator core 100 may be provided with circumferentially distributed receiving slots, and the stator winding 200 may be wound within the receiving slots of the stator core 100. The stator winding 200 within the receiving slots may be coated with insulating paper 500. To accommodate high motor power, each phase of the stator winding 200 may have multiple branches 210, each branch 210 having a lead 2100. The busbar assembly 3040 can be arranged on one side of the stator core 100 along the axial direction of the stator core 100, that is, the busbar assembly 3040 occupies the axial space of the motor. When the busbar assembly 3040 is arranged at the welding end of the hairpin coil, after the hairpin coil is installed in the receiving slot, the welding end needs to be expanded first, and the safe electrical distance between the coils needs to be ensured, which will cause it to occupy the radial space. Therefore, its radial space is more limited. The busbar assembly 3040 is arranged in the axial direction, which can effectively solve the problem of its limited radial space. It should be noted that the arrangement of the busbar assembly 3040 is not limited to Figure 9 The busbar assembly 3040 and the stator winding 200 are shown to be arranged opposite each other in the axial direction, or they can be staggered in the axial direction, that is, in the axial projection, the busbar assembly 3040 can be located radially inside or radially outside the projection area of the stator winding 200, and the present disclosure does not limit this. The busbar assembly 3040 is used to be electrically connected to the lead 2100 to energize each branch, and its connection method can include but is not limited to welding. Among them, the busbar assembly 3040 is electrically connected to the lead 2100 on the radial inside and outside of the stator core 100, that is, the lead 2100 of some branches 210 is connected to the inside of the busbar assembly 3040, and the lead 2100 of the remaining branches 210 is connected to the outside of the busbar assembly 3040.

[0041] Through the above technical solution, the bus assembly 3040 is set on one axial side, saving the radial space occupied by the motor. When there are multiple branches 210, the leads 2100 are distributedly connected to the inner and outer sides of the bus assembly 3040, so that the connections with the leads 2100 on both sides of the bus assembly 3040 are subjected to force, avoiding the risk of breakage caused by insufficient connection strength between the bus assembly 3040 and the leads 2100 due to unilateral connection, thereby affecting the performance of the motor.

[0042] Figure 5 The diagram of a stator winding 200 of one phase is shown. In the following embodiments, a three-phase motor is used as an example, that is, a three-phase stator winding 200 is provided. In addition, each phase stator winding 200 has six branches 210 as an example. Figures 1 to 4 As shown, there are six first phase branches 2101, six second phase branches 2102, and six third phase branches 2103. When introducing the coil 201 described below, the following embodiments are described by taking the coil 201 having ten layers as an example. Figure 6 and Figure 7 However, it should be understood that these limitations are merely exemplary illustrations for ease of description and are not intended to limit the present disclosure. In actual applications, the number of phases, the number of branches, and the number of coil layers can all be changed within the scope of protection of the present disclosure.

[0043] Reference Figure 9 and Figure 10 The busbar assembly 3040 may include a star point connection plate 300 and a wiring base 400. The wiring base 400 may be located on one side of the star point connection plate 300 along the axial direction. Figure 5 As shown, the leads 2100 may include a star point line 211 and lead wires 212. The star point connection plate 300 is electrically connected to each star point line 211, and the terminal block 400 is electrically connected to each lead wire 212. The multiple branches 210 of the multi-phase stator winding 200 may be configured as multiple layers of coils 201 arranged radially. The star point line 211 and lead wires 212 may be led out of different layers of coils 201 in the same radially arranged coil layer. The specific lead layer may depend on the winding method.

[0044] In the disclosed embodiment, each phase of the stator winding 200 has an even number of branches 210, such as two, four, or the six mentioned above. The number of star-point wires 211 electrically connected to the inner and outer sides of the star-point connection plate 300 can be the same to ensure consistent force distribution on both sides of the star-point connection plate 300 and prevent connection breakage caused by unilateral force. Similarly, the number of lead wires 212 electrically connected to the inner and outer sides of the terminal block 400 can also be the same.

[0045] The multiple branches 210 of the stator winding 200 can be constructed as multi-layer coils arranged in the radial direction. The stator winding 200 here refers to the stator winding 200 of all phases, Figure 5 , which shows a stator winding 200 of one phase. When there are multiple phases, the stator windings 200 of multiple phases can be arranged crosswise with each other. In other words, Figure 6 and Figure 7, the multi-layer coils in the same radial direction can be partial coils of the branches of the stator winding 200 of multiple phases, and are not limited to one phase. For example, the branches of one phase can be provided with five layers of coils in the radial direction. In one radial direction, all stator windings can be provided with ten layers of coils, and these ten layers of coils can be coils of two phases. For example, in one embodiment, taking a three-phase winding, each phase winding includes two parallel branches as an example, each branch can include a plurality of flat wire hairpin coils connected in series, and the flat wire hairpin coils in the multiple branches included in the three-phase winding are alternately arranged in sequence along the circumference of the stator core. The multi-layer coils in the same stator slot can be windings of different phases, and each branch can lead out a lead line and a star point line. Refer to Figure 1 and Figure 3 Taking the first phase branch 2101 as an example, its six branches are divided into three groups, and the three groups of branches are arranged 120 degrees apart in the circumferential direction. The arrangement of other phase branches is also the same, which will not be described in detail here. Figure 2 and Figure 4 The coil layer where the star-point line 211 connected to the inside of the star-point connection plate 300 is located is located above the coil layer where the star-point line 211 connected to the outside of the star-point connection plate 300 is located. This ensures that the star-point line 211 does not need to be bent at a large angle when it is led out, and prevents mutual interference. Similarly, the coil layer where the lead-out line 212 connected to the inside of the terminal block 400 is located is located inside the coil layer where the lead-out line 212 connected to the outside of the terminal block 400 is located.

[0046] Reference Figure 10 The busbar assembly 3040 may include a main body conductor 3141. For example, the star point connection plate 300 may include a first main body conductor 310, and the terminal block 400 may include a second main body conductor 410. Both the first main body conductor 310 and the second main body conductor 410 may extend circumferentially, i.e., be constructed in a quasi-circular shape. Each lead 2100 may be led out of a layer of coil 201. When the number of phases of the stator winding 200 is b and each phase of the stator winding 200 has a number of branches 210, the cross-sectional area of the first main body conductor may be no less than a. b lead cross-sectional area, in order to ensure that the current density is consistent and avoid serious heating. Similarly, the cross-sectional area of the second main body current-carrying portion 410 can be no less than a b is the cross-sectional area of each lead. In the embodiment of the present disclosure, the coil 201 may be a flat wire coil. Each lead 2100 may be drawn out of a layer of the coil 201, and the cross-sectional area of the lead 2100 is the cross-sectional area of the coil.

[0047] In one embodiment, to ensure that the main electrical routing portion 3141 has sufficient width, the two star point lines 211 of the two branches 210 in each group can be spaced farther apart, and the two lead lines 212 of the two branches 210 in each group can be spaced farther apart.

[0048] For example, refer to Figures 1 to 4 Multiple layers of coils 201 in the same radial direction can be referred to as coils in the same slot. One of the two star lines 211 extending from the coils in the same slot can be extended from the first coil 201 in the inner-to-outer direction, while the other can be extended from the second coil 201 in the outer-to-inner direction. In a stator with ten coil layers, one star line 211 can be extended from the first coil 201 in the inner-to-outer direction, while the other can be extended from the ninth coil 201. This ensures sufficient space for the first main body power routing portion 310, thereby achieving the aforementioned dimensional requirements. Alternatively, in other embodiments, one star line 211 can be extended from the second coil 201 in the inner-to-outer direction, while the other can be extended from the tenth coil 201. Similarly, the two lead lines 212 extending from the coils in the same slot can be arranged at relatively large distances from each other. It should be understood that not all stator slots have star lines 211 or lead lines 212 extending from them.

[0049] Each branch 210 has a corresponding lead wire 212 and a star line 211 located in the same slot. To facilitate connection between the busbar assembly 3040 and the lead wires 2100, the coil layer where the lead wire 212 corresponding to each branch 210 resides can be adjacent to the coil layer where the corresponding star line 211 resides. That is, the lead wire 212 and star line 211 of the same branch 210 are located in adjacent layers of the same slot to avoid being too far apart, resulting in excessive bending and occupying too much space. When the star line 211 is respectively located on the first and ninth layers of coils 201 as described above, the lead wire 212 can be respectively led out of the second and tenth layers of coils 201. When the star line 211 is respectively located on the second and ninth layers of coils 201 as described above, the lead wire 212 can be respectively led out of the first and ninth layers of coils 201. This arrangement enables the busbar assembly 3040 to effectively utilize the axial space of the stator winding 200 , thereby improving space utilization and avoiding occupying excessive axial space.

[0050] In the disclosed embodiment, the multiple branches 210 of the stator winding 200 form a radially arranged coil layer with eight or more layers. This number of layers can enhance motor efficiency, increase power density, and improve heat dissipation. Furthermore, this number of layers ensures that the distance between the two star-point lines 211 and the distance between the two lead lines 212 are both relatively large, providing sufficient space for arranging the busbar assembly 3040.

[0051] To effectively conserve radial space within the motor, in the disclosed embodiment, the busbar assembly 3040 can be configured such that, in an axial projection of the stator assembly, the busbar assembly 3040 and the leads 2100 are both located within the outer contour of the stator winding 200. For example, in an axial projection of the stator assembly, the star point connection plate 300 and the star point line 211 to which it is connected do not extend beyond the outer contour of the stator winding 200, and the terminal block 400 and the lead wires 212 to which it is connected do not extend beyond the outer contour of the stator winding 200.

[0052] In the embodiment of the present disclosure, when the stator assembly has a multi-phase stator winding 200, the star point connection plate 300 can be constructed as an integrated annular structure, which can be a whole ring or a partial ring, for example, Figure 8 As shown, the star point line 211 can be disconnected in areas where it is not needed, forming a partial ring structure, which can save material costs. Connecting the star point line 211 of the multi-phase stator winding 200 to the integrated star point connection plate 300 can reduce the number of parts, ease installation difficulty, and ensure consistent connection of multiple branches. Similarly, the terminal block 400 can also be constructed in a ring structure corresponding to the star point connection plate 300.

[0053] Reference Figure 8 As shown, the star point connection plate 300 may include a first main body electrical conductor 310 and a first star point connection portion 321 formed on the inner side of the first main body electrical conductor 310. The star point connection plate 300 may also include a second star point connection portion 322 formed on the outer side of the first main body electrical conductor 310. A gap is formed between the outer side of the first star point connection portion 321 and the inner side of the first main body electrical conductor 310, and a gap may be formed between the inner side of the second star point connection portion 321 and the outer side of the first main body electrical conductor 310. In one embodiment, an inner star point line 2111 may be connected to the inner side of the first star point connection portion 321, and an outer star point line 2112 may be connected to the outer side of the second star point connection portion 322, so that the two are relatively far apart. In addition, the aforementioned gap can further increase the distance between the two, thereby facilitating lead connection operations. The inner lead wire 2121 can pass through the gap between the first star point connection part 321 and the first main body power supply part 310, and the outer lead wire 2122 can be led out from the outside of the outer star point line 2112. Figure 3 and Figure 4 (As shown), the rotor typically needs to be installed at the welded end, which takes up space within the stator. Therefore, placing the inner lead wires 2121 at the aforementioned intervals can avoid interfering with rotor installation. When the busbar assembly 3040 is placed at the hairpin end of the hairpin coil, the connection position of each lead wire 2100 can be adjusted based on the actual space.

[0054] In order to avoid occupying radial space and ensure the current density of the terminal block 400, when the stator assembly has a b-phase stator winding 200, the terminal block 400 may include b layers of second main body electrical conductors 410 arranged at intervals along the axial direction, and each layer of the second main body electrical conductors 410 is used to connect the lead wires 212 of a phase stator winding 200. Figure 11 As shown, the second main body power routing section 410 may have three layers, each layer being provided with a phase connection portion 4101 for connecting to each phase. The inner and outer sides of each layer of the second main body power routing section 410 may be provided with a first lead wire connection portion 411 and a second lead wire connection portion 412, respectively, for connecting to the inner lead wire 2121 and the outer lead wire 2122, respectively. The three layers of the second main body power routing section 410 may be secured together using overmolded fasteners to ensure their integrity.

[0055] The axial distance between two adjacent layers of the second main body electrical conducting portions 410 is 4 mm to 6 mm, for example, 5 mm, to ensure a safe electrical distance.

[0056] According to a second aspect of an embodiment of the present disclosure, a motor is provided, comprising a rotor and the above-mentioned stator assembly, and having all the beneficial effects of the above-mentioned stator assembly, which will not be described in detail here.

[0057] Among them, the power of the motor can be no less than 300kW. The motor under this power has more branches, so it occupies a larger radial space. When the above-mentioned stator assembly is adopted, the bus assembly 3040 can be effectively avoided from occupying the radial space.

[0058] According to a third aspect of an embodiment of the present disclosure, an electric drive assembly is provided, which includes the above-mentioned motor and has all the beneficial effects of the above-mentioned motor, which will not be repeated here.

[0059] According to a fourth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the aforementioned motor or electric drive assembly, and having all the beneficial effects of the aforementioned motor or electric drive assembly, which are not described in detail here. The vehicle may include, but is not limited to, a supercar.

[0060] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0062] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A stator assembly, characterized in that: include: stator core; At least one phase of stator winding is wound around the stator core, and each phase of the stator winding is configured to have multiple branches, each branch having a lead wire; as well as A busbar assembly is arranged on one side of the stator core along the axial direction of the stator core and is electrically connected to the lead wire, wherein the inner side and the outer side of the busbar assembly along the radial direction of the stator core are both electrically connected to the lead wire.

2. The stator assembly according to claim 1, characterized in that Each phase of the stator winding has an even number of branches, and the number of the leads connected to the inner and outer sides of the busbar assembly is the same.

3. The stator assembly according to claim 1, characterized in that The plurality of branches of the stator winding are constructed as multi-layer coils arranged along the radial direction. The lead connected to the inner side of the busbar assembly is an inner lead, the lead connected to the outer side of the busbar assembly is an outer lead, and the coil layer where the inner lead is located is located radially inward of the coil layer where the outer lead is located.

4. The stator assembly according to claim 1, characterized in that The number of phases of the stator winding is b, each phase of the stator winding has a branches, the busbar assembly includes a main body electrical conduction portion, the main body electrical conduction portion extends along the circumferential direction, and the cross-sectional area of the main body electrical conduction portion is not less than a b is the cross-sectional area of the lead.

5. The stator assembly according to claim 1, characterized in that The busbar assembly is configured such that, in an axial projection view of the stator assembly, the busbar assembly and the leads are both located within an outer contour of the stator winding.

6. The stator assembly according to claim 1, wherein: The lead includes a star point line, and the busbar assembly includes a star point connection plate, which is electrically connected to each of the star point lines respectively, wherein the star point connection plate is electrically connected to the star point line on both the inner side and the outer side along the radial direction of the stator core.

7. The stator assembly according to claim 6, characterized in that The plurality of branches of the stator winding are constructed as multi-layer coils arranged along the radial direction. The multiple layers of coils in the same radial direction are same-slot coils, and the two star-point lines derived from the same-slot coils include an inner star-point line and an outer star-point line. The inner star-point line is derived from the first layer of coils in the direction from the inside to the outside, and the outer star-point line is derived from the second layer of coils in the direction from the outside to the inside.

8. The stator assembly according to claim 6, characterized in that The plurality of branches of the stator winding are constructed as multi-layer coils arranged along the radial direction. The multiple layers of coils in the same radial direction are same-slot coils, and the two star-point lines derived from the same-slot coils include an inner star-point line and an outer star-point line. The inner star-point line is derived from the second layer of coils in the direction from the inside to the outside, and the outer star-point line is derived from the first layer of coils in the direction from the outside to the inside.

9. The stator assembly according to claim 7 or 8, characterized in that: The number of radially arranged coil layers formed by the multiple branches of the stator winding is eight or more.

10. The stator assembly according to claim 6, characterized in that The stator assembly has a multi-phase stator winding, and the star point connecting plate is configured as an integrated annular structure.

11. The stator assembly according to claim 6, wherein: The star point connection plate includes a first main body power running portion and a first star point connection portion formed on the inner side of the first main body power running portion, a gap is formed between the outer side of the first star point connection portion and the inner side of the first main body power running portion, the star point line is connected to the inner side of the first star point connection portion, and / or The star point connection plate includes a first main body power conducting portion and a second star point connection portion formed outside the first main body power conducting portion. A gap is formed between the inner side of the second star point connection portion and the outer side of the first main body power conducting portion. The star point line is connected to the outer side of the second star point connection portion.

12. The stator assembly according to claim 1, wherein: The lead wires include lead wires, and the busbar assembly includes a wiring seat, which is electrically connected to each of the lead wires. The inner side and the outer side of the wiring seat along the radial direction are both electrically connected to the lead wires.

13. The stator assembly according to claim 12, wherein: The lead wire includes a star point wire, the busbar assembly includes a star point connecting plate, and the terminal block is arranged on one side of the star point connecting plate along the axial direction.

14. The stator assembly according to claim 13, wherein: The multiple branches of the stator winding are constructed as multi-layer coils arranged along the radial direction, the lead wires and the star line of each branch are located in the same radially arranged coil layer, and the coil layer where the lead wires of each branch are located is adjacent to the coil layer where the star line is located.

15. The stator assembly according to claim 12, wherein: The stator assembly has a b-phase stator winding, and the terminal block includes b layers of second main body electrical conduction parts spaced apart along the axial direction, and each layer of the second main body electrical conduction parts is connected to the lead wire of one phase of the stator winding.

16. The stator assembly according to claim 15, characterized in that The axial distance between the second main body electrical conduction parts of two adjacent layers is 4 mm to 6 mm.

17. A motor, characterized in that: The invention comprises a rotor and a stator assembly according to any one of claims 1 to 16.

18. The motor according to claim 17, characterized in that The power of the motor is not less than 300kW.

19. An electric drive assembly, characterized in that: Comprising a motor according to claim 17 or 18.

20. A vehicle, characterized in that: Includes the motor according to claim 17 or 18, or includes the electric drive assembly according to claim 18.

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