Busbar assembly, motor stator, motor, power assembly and vehicle

Abstract

The invention discloses a busbar assembly, a motor stator, a motor, a power assembly and a vehicle, and the busbar assembly comprises a first neutral busbar which comprises a first busbar body and a plurality of first neutral point terminals which are arranged in the circumferential direction of the motor stator; the second neutral busbar comprises a second busbar main body and a plurality of second neutral point terminals which are arranged along the circumferential direction of the motor stator and are positioned on the radial inner side of the first neutral point terminal; each phase busbar comprises a plurality of phase terminals and a third busbar main body, the first busbar main body, the second busbar main body and the third busbar main body are all located between the first neutral point terminal and the second neutral point terminal, and the thickness direction of the first busbar main body and the thickness direction of the second busbar main body are perpendicular to the axial direction; the at least one third busbar body comprises a first part with the thickness direction parallel to the axial direction, and the first part is located on the axial side of the first busbar body and the second busbar body. According to the busbar assembly provided by the embodiment of the invention, the occupied space is reduced, and the electrical safety distance is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a busbar assembly, a motor stator, a motor, a powertrain and a vehicle. Background Art

[0002] As the number of branches and conductor layers of flat wire motors increases, their lead wires become more and more complicated. In order to reduce the difficulty of assembly, reduce the frequency of errors, and improve the appearance quality of the motor stator assembly, flat wire motors often use busbar assemblies to connect their lead wires.

[0003] In the related art, the busbar assembly has a complex structure and a large volume. The U-phase, V-phase, and W-phase busbars adopt a stacked design, with an excessively large axial dimension and a low integration level, which cannot meet the requirements of motor miniaturization and integration. In addition, the busbar assembly is prone to short circuits and other problems during use. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a busbar assembly for a motor stator, which is conducive to reducing the occupied space and improving the electrical safety distance.

[0005] The present invention also provides a motor stator having the busbar assembly.

[0006] The present invention also provides a motor having the motor stator.

[0007] The present invention also provides a power assembly having the motor.

[0008] The present invention also provides a vehicle having the power assembly.

[0009] According to an embodiment of the present invention, a busbar assembly of a motor stator includes: a first neutral busbar, the first neutral busbar includes a plurality of first neutral point terminals and a first busbar body connecting the plurality of first neutral point terminals, the plurality of first neutral point terminals are arranged along the circumferential direction of the motor stator; a second neutral busbar, the second neutral busbar includes a plurality of second neutral point terminals and a second busbar body connecting the plurality of second neutral point terminals, the plurality of second neutral point terminals are arranged along the circumferential direction of the motor stator and are located radially inward of the first neutral point terminal; and a plurality of phase busbars, the phase busbars It includes multiple phase terminals and a third busbar body connecting the multiple phase terminals, wherein the first busbar body, the second busbar body and the multiple third busbar bodies are all located between the first neutral point terminal and the second neutral point terminal, and all have mutually perpendicular width and thickness directions, the thickness direction of the first busbar body and the second busbar body is perpendicular to the axial direction of the motor stator, at least one of the third busbar bodies includes a first part with a thickness direction parallel to the axial direction, and the first part is located on one side of the axial direction of the first busbar body and the second busbar body.

[0010] According to the busbar assembly of the motor stator in the embodiment of the present invention, the first busbar body and the second busbar body are located between the first neutral point terminal and the second neutral point terminal with the thickness direction perpendicular to the axial direction, and the first part of the third busbar body is located on the axial side of the first busbar body and the second busbar body with the thickness direction parallel to the axial direction. This can not only effectively reduce the occupied space of the busbar assembly, which is conducive to the miniaturization and integration of the motor, but also ensure that the spacing between adjacent busbar bodies meets the electrical safety requirements, thereby improving the safety of use and service life.

[0011] In addition, the busbar assembly of the motor stator according to the above embodiment of the present invention may also have the following additional technical features:

[0012] According to some embodiments of the present invention, a plurality of the third bus-bar bodies are arranged circumferentially, any two adjacent third bus-bar bodies are partially staggered along the circumferential direction and the non-staggered portions are arranged axially, one of the non-staggered portions is the first portion, and the other of the non-staggered portions is the second portion whose thickness direction is perpendicular to the axial direction of the motor stator.

[0013] According to some embodiments of the present invention, the first busbar body and the second busbar body have opposing portions that are radially opposed, and a portion of the third busbar body that is axially opposite to the opposing portions is the first portion.

[0014] According to some embodiments of the present invention, a portion of the phase terminals and a plurality of the first neutral point terminals are arranged along a first circumference of the motor stator, and another portion of the phase terminals and a plurality of the second neutral point terminals are arranged along a second circumference of the motor stator and are located radially inward of the first neutral point terminal.

[0015] According to some embodiments of the present invention, the busbar assembly also includes: a branch busbar for connecting two sub-branches of the motor stator, the branch busbar including a middle busbar body and two branch terminals, the two branch terminals are respectively connected to the radial inner end and the radial outer end of the middle busbar body, and the two branch terminals are respectively used to connect to the two sub-branches, wherein the thickness direction of the middle busbar body is parallel to the axial direction of the motor stator and is located on one axial side of the first busbar body and the second busbar body, and the two branch terminals are respectively arranged along the first circumference and the second circumference.

[0016] According to some embodiments of the present invention, the first neutral point terminal is opposite to the phase terminal in the radial direction of the motor stator, the second neutral point terminal is opposite to the phase terminal in the radial direction of the motor stator, and the two branch terminals are opposite to each other in the radial direction of the motor stator.

[0017] According to some embodiments of the present invention, the spacing between the first neutral bus and the adjacent phase bus is greater than or equal to 2 mm; the spacing between the second neutral bus and the adjacent phase bus is greater than or equal to 2 mm; and the spacing between two adjacent phase busses is greater than or equal to 2 mm.

[0018] According to some embodiments of the present invention, the phase busbar further includes an input terminal disposed on one axial side of the third busbar body, and the input terminal is used to be connected to a power source.

[0019] According to some embodiments of the present invention, the busbar assembly includes: a busbar support, the busbar support partially wraps the phase busbar, the first neutral busbar and the second neutral busbar.

[0020] The motor stator according to the embodiment of the present invention comprises a stator core, a stator winding and a busbar assembly of the motor stator according to the embodiment of the present invention, wherein the stator winding is mounted on the stator core, and the busbar assembly is electrically connected to the stator winding.

[0021] According to some embodiments of the present invention, the stator core has a plurality of stator slots arranged along the circumferential direction, the stator winding includes a multi-phase winding, each phase of the winding includes two branches, wherein the incoming line end of one of the branches and the outgoing line end of the other branch are both located in the outermost layer in the corresponding stator slot, wherein the outgoing line end of one of the branches and the incoming line end of the other branch are both located in the innermost layer in the corresponding stator slot, the outgoing line end of the outermost layer is connected to the first neutral point terminal, the outgoing line end of the innermost layer is connected to the second neutral point terminal, and the incoming line end of the winding of the same phase is connected one-to-one with the phase terminal of the same phase bus.

[0022] According to some embodiments of the present invention, the branch includes two sub-branches and two inter-branch terminals, wherein one end of one of the sub-branches is an incoming line end and the other end is connected to one of the inter-branch terminals, and one end of the other sub-branch is an outgoing line end and the other end is connected to another of the inter-branch terminals, wherein one of the inter-branch terminals is located in the outermost layer in the corresponding stator slot, wherein the other inter-branch terminal is located in the innermost layer in the corresponding stator slot, and the two inter-branch terminals are connected through a branch bus; or, the other inter-branch terminal extends radially outward from the innermost layer in the corresponding stator slot and is connected to one of the inter-branch terminals.

[0023] According to some embodiments of the present invention, the branch includes two sub-branches, and the two ends of the sub-branches are respectively located in the innermost layer and the outermost layer of different stator slots, wherein the end of one sub-branch located in the innermost layer is connected to the end of another sub-branch located in the outermost layer, and the sub-branch includes an in-slot conductor located in the stator slot and an out-slot conductor located at both axial ends of the stator core, wherein in one of the sub-branches, at one axial end of the stator core, the out-slot conductor connects the two in-slot conductors at a first pitch, and the two in-slot conductors located in the middle in the series connection direction of the sub-branch are connected by a first connecting conductor with a second pitch, At the other axial end of the stator core, the outer-slot conductor connects the two in-slot conductors at a third pitch; in another of the sub-branch, at one axial end of the stator core, the outer-slot conductor connects the two in-slot conductors at a first pitch, and the two in-slot conductors located in the middle in the series direction of the sub-branch are connected by a second connecting conductor with a fourth pitch, and at the other axial end of the stator core, the outer-slot conductor connects the two in-slot conductors at a third pitch, wherein the second pitch is 1 pitch smaller than the first pitch, the third pitch is 2 pitches smaller than the first pitch, and the fourth pitch is 1 pitch larger than the first pitch.

[0024] The motor according to the embodiment of the present invention includes the motor stator according to the embodiment of the present invention.

[0025] A powertrain according to an embodiment of the present invention includes a motor according to an embodiment of the present invention.

[0026] A vehicle according to an embodiment of the present invention includes a powertrain according to an embodiment of the present invention.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a partial structural schematic diagram of a motor stator according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 The middle circle shows the enlarged structural schematic diagram of A;

[0031] Figure 3 is a partial structural schematic diagram of a busbar assembly according to an embodiment of the present invention;

[0032] Figure 4 is a partial structural schematic diagram of a busbar assembly according to an embodiment of the present invention;

[0033] Figure 5 is a partial structural schematic diagram of a busbar assembly according to an embodiment of the present invention;

[0034] Figure 6 is a partial structural schematic diagram of a busbar assembly according to an embodiment of the present invention;

[0035] Figure 7 is a schematic structural diagram of a phase busbar according to an embodiment of the present invention;

[0036] Figure 8 is a schematic structural diagram of a first neutral busbar and a second neutral busbar according to an embodiment of the present invention;

[0037] Fig. 9 is a schematic structural diagram of a motor stator according to an embodiment of the present invention;

[0038] Fig.10 yes Fig. 9 Axial view of

[0039] Fig.11 is a schematic structural diagram of a busbar assembly according to an embodiment of the present invention;

[0040] Fig.12 is a schematic structural diagram of a busbar assembly according to an embodiment of the present invention;

[0041] Fig.13 is a schematic structural diagram of a busbar support according to an embodiment of the present invention;

[0042] Fig.14 is a wiring schematic diagram of a stator winding according to an embodiment of the present invention;

[0043] Fig.15 1 is a schematic diagram of the winding of the U-phase winding of the stator winding according to an embodiment of the present invention, wherein the solid line represents the slot conductor outside the plug-in end, and the dotted line represents the slot conductor outside the welding end;

[0044] Fig.16 yes Fig.15 The wiring diagram of the U1 branch in the middle;

[0045] Fig.17 yes Fig.15 The wiring diagram of the U2 branch in the middle;

[0046] Fig.18 is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0047] Reference numerals:

[0048] Motor stator 100; motor 200; vehicle 1000;

[0049] Busbar assembly 10;

[0050] A first neutral busbar 11; a first neutral point terminal 111; a first busbar body 112;

[0051] A second neutral busbar 12; a second neutral point terminal 121; a second busbar body 122;

[0052] Phase busbar 13; phase terminal 131; third busbar body 132; input terminal 133; first part 134; second part 135;

[0053] Busbar support 14; slot 142;

[0054] Branch bus 15; middle bus body 151; branch terminal 152;

[0055] stator core 20; stator slot 201; slot insulator 21;

[0056] Stator winding 30; branch 31; incoming terminal 32; outgoing terminal 33; inter-branch terminal 34; first connecting conductor 35; second connecting conductor 36. DETAILED DESCRIPTION

[0057] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, a first feature "above" or "below" the second feature may include the first and second features being directly in contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, and a first feature "above", "above" and "above" the second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is horizontally higher than the second feature.

[0060] The busbar assembly 10 of the motor stator 100 and the motor stator 100 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0061] Reference Figure 1 and Fig. 9 As shown, the motor stator 100 according to the embodiment of the present invention comprises a stator core 20, a stator winding 30 and a bus assembly 10 of the motor stator 100 according to the embodiment of the present invention, the stator winding 30 is installed on the stator core 20, and the bus assembly 10 is electrically connected to the stator winding 30.

[0062] Reference Figure 1-Figure 8 As shown, the busbar assembly 10 of the motor stator 100 according to the embodiment of the present invention may include: a first neutral busbar 11 , a second neutral busbar 12 and a plurality of phase busbars 13 .

[0063] Specifically, the first neutral busbar 11 includes a plurality of first neutral point terminals 111 and a first busbar body 112 connecting the plurality of first neutral point terminals 111. The second neutral busbar 12 is located radially inside the first neutral busbar 11, and includes a plurality of second neutral point terminals 121 and a second busbar body 122 connecting the plurality of second neutral point terminals 121.

[0064] The first neutral point terminal 111 and the second neutral point terminal 121 are both used to connect to the neutral point of the stator winding 30. Figure 1-Figure 2 and Fig.14 As shown, the stator winding 30 may include a U-phase winding, a V-phase winding and a W-phase winding, each of which includes two parallel branches 31, namely U1, U2, V1, V2, W1 and W2, wherein the neutral points of the U1 branch 31, the V1 branch 31 and the W1 branch 31 are respectively connected to multiple first neutral point terminals 111 to form a common neutral point O1, and the neutral points of the U2 branch 31, the V2 branch 31 and the W2 branch 31 are respectively connected to multiple second neutral point terminals 121 to form a common neutral point O2.

[0065] By arranging the first neutral bus 11 and the second neutral bus 12 in radial direction, it is also convenient to connect the two neutral buses to the neutral points led out at different positions of the stator winding 30 respectively, so as to simplify the structure of the terminal at the neutral point. For example, the terminal at the neutral point does not need to extend radially or extend radially for a short distance to be connected to the adjacent neutral bus, thereby reducing the risk of short circuit between the neutral point and the phase bus 13 and improving electrical safety.

[0066] Reference Figure 2-Figure 7 The phase busbar 13 includes a plurality of phase terminals 131 and a third busbar body 132 connecting the plurality of phase terminals 131. The phase terminals 131 are used to be connected to the inlet terminals 32 of the stator winding 30 so as to pass current into the stator winding 30 through the phase busbar 13. Figure 2 and Fig.14 As shown, the phase bus 13 consists of three, namely, a U-phase bus 13, a V-phase bus 13 and a W-phase bus 13. Each phase bus 13 includes two phase terminals 131. The two phase terminals 131 of the U-phase bus 13 are respectively connected to the incoming line terminals 32 of the U1 branch 31 and the U2 branch 31, the two phase terminals 131 of the V-phase bus 13 are respectively connected to the incoming line terminals 32 of the V1 branch 31 and the V2 branch 31, and the two phase terminals 131 of the W-phase bus 13 are respectively connected to the incoming line terminals 32 of the W1 branch 31 and the W2 branch 31, thereby realizing parallel connection of multiple branches 31 of the same-phase winding, and transmitting current to the multiple branches 31 through the same phase bus 13.

[0067] In addition, in some embodiments of the present application, Figure 2-Figure 8 As shown, the first busbar body 112, the second busbar body 122 and the third busbar body 132 are all located between the first neutral point terminal 111 and the second neutral point terminal 121, and the first busbar body 112, the second busbar body 122 and the third busbar body 132 have mutually perpendicular width and thickness directions. It can be understood that the dimension in the width direction is greater than the dimension in the thickness direction, so that the first busbar body 112, the second busbar body 122 and the third busbar body 132 are all formed into a flat shape. For example Figure 7 and Figure 8 The direction indicated by arrow F1 is the thickness direction corresponding to the passed position, and the direction indicated by arrow F2 is the width direction corresponding to the passed position. Of course, since the length direction of the bus body is bent and extended, the thickness direction or width direction at different positions will change with the bending situation.

[0068] The thickness directions of the first busbar body 112 and the second busbar body 122 are both perpendicular to the axial direction of the motor stator 100. At least one third busbar body 132 includes a first portion 134, the thickness direction of the first portion 134 is parallel to the axial direction of the motor stator 100, and the first portion 134 is located on one side of the axial direction of the first busbar body 112 and the second busbar body 122.

[0069] Thus, the first busbar body 112 and the second busbar body 122 are located in the same layer in the axial direction and arranged in the radial direction, and the radial occupied space can be reduced by the thickness direction of the first busbar body 112 and the second busbar body 122 being perpendicular to the axial direction, so as to increase the electrical safety distance between the first busbar body 112 and the second busbar body 122. In addition, the first portion 134 is located in another layer in the axial direction to reduce the number of busbar bodies arranged in the same layer in the radial direction, so as to increase the spacing and improve safety, and the thickness direction of the first portion 134 is parallel to the axial direction to reduce the axial occupied space, thereby reducing the overall occupied space of the busbar assembly 10.

[0070] In this way, the circumferential, radial and axial space between the first neutral point terminal 111 and the second neutral point terminal 121 can be fully utilized, and the thickness direction of the first part 134 can be changed by twisting the third bus body 132 to ensure the electrical safety distance between the first bus body 112, the second bus body 122 and the third bus body 132.

[0071] According to the busbar assembly 10 of the motor stator 100 of the embodiment of the present invention, the first busbar body 112 and the second busbar body 122 are located between the first neutral point terminal 111 and the second neutral point terminal 121 and the thickness direction is perpendicular to the axial direction, and the first part 134 of the third busbar body 132 is located on the axial side of the first busbar body 112 and the second busbar body 122 and the thickness direction is parallel to the axial direction. This can not only effectively reduce the occupied space of the busbar assembly 10, which is conducive to the miniaturization and integration of the motor 200, but also ensure that the spacing between adjacent busbar bodies meets the electrical safety requirements, thereby improving the safety of use and the service life.

[0072] Since the busbar assembly 10 of the motor stator 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, the beneficial effects of the motor stator 100 according to the embodiment of the present invention are the same as those of the busbar assembly 10 according to the embodiment of the present invention, and are not repeated here.

[0073] In addition, the electrical safety distance can be increased and the occupied space can be reduced by properly arranging the positions of the multiple third busbar bodies 132 .

[0074] In some embodiments, Figure 2-Figure 7 As shown, a plurality of third bus bar bodies 132 are arranged circumferentially, and any two adjacent third bus bar bodies 132 are partially staggered circumferentially. In other words, any two adjacent third bus bar bodies 132 are partially staggered and partially not staggered circumferentially to reduce the circumferential size of the bus bar assembly 10.

[0075] The non-staggered parts of two adjacent third bus-bar bodies 132 are arranged along the axial direction, and one of the non-staggered parts is the first part 134 and the other is the second part 135, and the thickness direction of the second part 135 is perpendicular to the axial direction of the motor stator 100. In other words, the thickness direction of one third bus-bar body 132 in the non-staggered part is parallel to the axial direction of the motor stator 100, and the thickness direction of the other third bus-bar body 132 in the non-staggered part is perpendicular to the axial direction of the motor stator 100.

[0076] Thus, between the first neutral point terminal 111 and the second neutral point terminal 121, in the radial direction of each position, a plurality of third busbar bodies 132 are arranged in only one row, so as to increase the spacing between the third busbar body 132 and the adjacent neutral point terminal or the adjacent first busbar body 112 or the second busbar body 122, and improve the electrical safety distance. In addition, one thickness direction of the non-staggered parts of two adjacent third busbar bodies 132 is parallel to the axial direction, which can reduce the axial space occupied by the two when they are axially stacked.

[0077] In some embodiments, Figure 2-Figure 6As shown, the first busbar body 112 and the second busbar body 122 have facing parts that face each other in the radial direction. In other words, the first busbar body 112 and the second busbar body 122 are at least partially non-staggered and non-staggered parts that are formed into facing parts in the circumferential direction. In other words, the central angles corresponding to the facing parts of the first busbar body 112 and the second busbar body 122 coincide. The part of the third busbar body 132 that faces the facing part in the axial direction is the first part 134, so that when the first part 134 and the facing part are stacked in the axial direction, the occupied axial space is smaller, so as to reduce the occupied space of the busbar assembly 10.

[0078] For example, see Figure 3-Figure 7 , the three third busbar bodies 132 are respectively the U-phase busbar body, the V-phase busbar body and the W-phase busbar body in the clockwise direction, and the busbar bodies are roughly divided into three parts: left, middle and right along the length direction. In the area between the first neutral point terminal 111 and the second neutral point terminal 121, the thickness directions of the left and middle parts of the U-phase busbar body are perpendicular to the axial direction and are arranged in two layers radially with the left part of the second busbar body 122; the right part of the U-phase busbar body and the left part of the V-phase busbar body are not staggered in the circumferential direction, the thickness direction of the right part of the U-phase busbar body is parallel to the axial direction and is located on the axial side of the left part of the V-phase busbar body, the thickness direction of the left part of the V-phase busbar body is perpendicular to the axial direction and is arranged in two layers radially with the second busbar body 122; the left part of the first busbar body 112 and the right part of the second busbar body 122 Arranged in two layers in the radial direction, the thickness direction of the middle part of the V-phase busbar body is parallel to the axial direction and is located on the axial side of the left part of the first busbar body 112 and the right part of the second busbar body 122; the right part of the V-phase busbar body and the left part of the W-phase busbar body are not staggered in the circumferential direction, the thickness direction of the right part of the V-phase busbar body is perpendicular to the axial direction and is arranged in two layers in the radial direction with the second busbar body 122, the thickness direction of the left part of the W-phase busbar body is parallel to the circumferential direction and is located on the axial side of the right part of the V-phase busbar body; the thickness directions of the middle and right parts of the W-phase busbar body are both perpendicular to the axial direction and are arranged in two layers in the radial direction with the first busbar body 111. Therefore, in the area between the first neutral point terminal 111 and the second neutral point terminal 121, only two busbar bodies are arranged in two layers in the radial direction at any position, which is conducive to making the busbar bodies stacked in the same area have a larger layout space to improve the electrical safety distance.

[0079] According to some embodiments of the present invention, Figure 2-Figure 4 As shown, a portion of the phase terminals 131 and a plurality of first neutral point terminals 111 are arranged along a first circumference of the motor stator 100 , and another portion of the phase terminals 131 and a plurality of second neutral point terminals 121 are arranged along a second circumference of the motor stator 100 and are located radially inward of the first neutral point terminal 111 .

[0080] In other words, all phase terminals 131, the first neutral point terminal 111, and the second neutral point terminal 121 are arranged in two rows spaced apart in the radial direction, so as to provide space for the third busbar body 132 to be arranged between the two rows of terminals, which is beneficial to reducing the axial height of the busbar assembly 10. In addition, the phase terminal 131 is arranged in a row with the first neutral point terminal 111 or the second neutral point terminal 121 to reduce the space occupied by the terminal in the radial direction, thereby providing more arrangement space for the third busbar body 132 to improve the electrical safety distance.

[0081] It should be noted that the phase terminals 131 and the first neutral point terminal 111 arranged in a row along the first circumference can be arranged strictly along the virtual first circumferential direction, or can be radially offset by a small distance relative to the first circumference, which needs to be understood in a broad sense. Of course, the embodiment in which the arrangement is strictly along the first circumferential direction has a better effect of improving the electrical safety distance. Similarly, the phase terminals 131 and the second neutral point terminal 121 arranged in the first row along the second circumference can be arranged strictly along the virtual second circumferential direction, or can be radially offset by a small distance relative to the second circumference.

[0082] In some embodiments, Figure 2-Figure 5 As shown, the bus assembly 10 may further include a branch bus 15, and the branch bus 15 is used to connect two sub-branches of the motor stator 100. For example, the stator winding 30 of the motor stator 100 includes a multi-phase winding, each phase winding includes a plurality of branches 31 connected in parallel, each branch 31 may include a plurality of sub-branches connected in series, and at least two sub-branches are connected in series through the branch bus 15.

[0083] Specifically, the branch bus 15 may include a central bus body 151 and two branch terminals 152, the two branch terminals 152 are respectively connected to the radial inner end and the radial outer end of the central bus body 151, and the two branch terminals 152 are respectively used to connect to the two sub-branches. Thus, the branch bus 15 realizes the connection of the two sub-branches, and by setting the branch bus 15, the ends of the two sub-branches for connection can be arranged staggered in the radial direction, and the position setting is more flexible, which is conducive to simplifying the structure of the conductor included in the branch 31, so that the conductor directly connected to the branch bus 15 can be designed with the same structure as other conductors not directly connected to the branch bus 15, so as to reduce the processing difficulty and wiring difficulty of the stator winding 30 and reduce the production cost.

[0084] In addition, continue to refer to Figure 2-Figure 5The thickness direction of the middle busbar body 151 is parallel to the axial direction of the motor stator 100 and is located on one side of the axial direction of the first busbar body 112 and the second busbar body 122, for example, a side close to the stator core 20. In the embodiment where the third busbar body 151 includes the first portion 134 and the first portion 134 and the middle busbar body 151 are located on the same side in the axial direction, the middle busbar body 151 and the first portion 134 can be located on the same layer (i.e., not staggered in the axial direction) to reduce the overall axial size of the busbar assembly 10.

[0085] The two branch terminals 152 can be arranged along the first circumference and the second circumference respectively, that is, the branch terminal 152 at the radial outer end and the multiple first neutral point terminals 111 are arranged along the first circumference, and the branch terminal 152 at the radial inner end and the multiple second neutral point terminals 121 are arranged along the second circumference to reduce the radial occupied space.

[0086] In some embodiments, Figure 2-Figure 6 As shown, the first neutral point terminal 111 and the phase terminal 131 are opposite to each other in the radial direction of the motor stator 100, the second neutral point terminal 121 and the phase terminal 131 are opposite to each other in the radial direction of the motor stator 100, and the two branch terminals 152 are opposite to each other in the radial direction of the motor stator 100. On the one hand, the neutral point terminal and the phase terminal 131 can be effectively staggered in the radial direction, and short circuit is not easy to occur. On the other hand, the arrangement between the neutral point terminal, the phase terminal 131 and the branch terminal 152 is more orderly, which is conducive to reducing the risk of wrong connection.

[0087] According to some specific embodiments of the present invention, Figure 1-Figure 7 As shown, the phase busbar 13 includes two phase terminals 131, which can be connected to the two branches 31 of the stator winding 30. The two phase terminals 131 are staggered along the radial direction of the motor stator 100, and the two phase terminals 131 are staggered along the circumferential direction of the motor stator 100. The third busbar body 132 is located between the two phase terminals 131, and the two ends of the third busbar body 132 in the length direction are respectively connected to the two phase terminals 131. The third busbar body 132 can be extended from the outside to the inside as a whole, or it can be partially extended from the outside to the inside and partially extended along the circumferential direction. The specific extension direction can be flexibly set according to the electrical safety distance requirements between the busbar bodies.

[0088] According to some embodiments of the present invention, Figure 2 and Figure 7As shown, the phase busbar 13 also includes an input terminal 133 disposed on one axial side of the third busbar body 132, and the input terminal 133 is used to connect to the power supply. For example, the input terminal 133 can be disposed on the side of the third busbar body 132 away from the stator core 20. By providing the input terminal 133, multiple phase terminals 131 can input current through the same input terminal 133 to simplify the connection structure with the power supply, and the area of ​​the input terminal 133 can be larger to increase the electrical connection area without affecting the electrical safety distance.

[0089] In some embodiments, at least one of the first neutral busbar 11, the second neutral busbar 12, the phase busbar 13, and the branch busbar 15 is a sheet metal part. Forming by sheet metal processing makes it easier to form the first neutral busbar 11, the second neutral busbar 12, the phase busbar 13, and the branch busbar 15, and facilitates the formation of a bending structure.

[0090] In some embodiments, Figure 9-13 As shown, the busbar assembly 10 includes a busbar support 14, and the busbar support 14 partially wraps the phase busbar 13, the first neutral busbar 11, and the second neutral busbar 12 to achieve position fixation and installation of the three, prevent movement and cause short circuit, and also facilitate improving the connection reliability between the busbar assembly 10 and the stator winding 30. In some embodiments including the branch busbar 15, the busbar support 14 can also partially wrap the branch busbar 15 to further improve reliability.

[0091] For example Figure 9-13 As shown, the busbar support 14 may be provided with a plurality of slots 142, which penetrate the busbar support 14 axially and have a radial inner end opening or a radial outer end opening. The first busbar body 112, the second busbar body 122, the third busbar body 132 and the middle busbar body 151 are wrapped in the busbar support 14, and the phase terminal 131, the first neutral point terminal 111, the second neutral point terminal 121 and the branch terminal 152 are respectively inserted into the corresponding slots 142, so that the inlet terminal 32, the neutral point and the branch terminal 34 of the stator winding 30 are inserted into the slots 142 and connected (such as welding) with the terminals of the corresponding busbar assembly 10.

[0092] In some specific embodiments, the bus support 14 can be an injection molded part, which is formed by an injection molding process to simultaneously achieve connection with the phase bus 13, the first neutral bus 11, the second neutral bus 12 and the branch bus 15. The injection molded part also plays an insulating role to improve safety.

[0093] In some embodiments of the present invention, by reasonably setting the relative positions and structures of the first neutral bus 11, the second neutral bus 12 and the phase bus 13, a sufficient electrical safety distance can be formed between the neutral bus and the phase bus 13, and between two adjacent phase busses 13. For example, the spacing between the first neutral bus 11 and the adjacent phase bus 13 is greater than or equal to 2 mm; the spacing between the second neutral bus 12 and the adjacent phase bus 13 is greater than or equal to 2 mm; the spacing between two adjacent phase busses 13 is greater than or equal to 2 mm. Here, the spacing refers to the distance at the minimum spacing distance. In an embodiment including a branch bus 15, the spacing between the branch bus 15 and the adjacent first neutral bus 11, the second neutral bus 12 or the phase bus 13 is greater than or equal to 2 mm.

[0094] The motor stator 100 according to some embodiments of the present invention is described below with reference to the accompanying drawings.

[0095] like Figure 1-Figure 2 and Figure 15-17 As shown, the stator core 20 has a plurality of stator slots 201 arranged in the circumferential direction, and the stator winding 30 includes a multi-phase winding, each phase winding including two branches 31. The stator winding 30 is mounted on the stator core 20 to arrange multiple layers of conductors in the stator slots 201. In other words, the stator slots 201 have a plurality of slot layers arranged in the radial direction, and each slot layer is used to arrange a conductor of the stator winding 30. For example, the conductor can be a flat wire conductor, so that the motor stator 100 is formed as a flat wire stator.

[0096] Continue to refer to Figure 15-17 In the same phase winding, the inlet end 32 of one branch 31 and the outlet end 33 of another branch 31 are both located at the outermost layer in the corresponding stator slot 201, that is, located at the radially outermost slot layer of the stator slot 201; the outlet end 33 of one branch 31 and the inlet end 32 of another branch 31 are both located at the innermost layer in the corresponding stator slot 201, that is, located at the radially innermost slot layer of the stator slot 201. Here, the "inlet end 32" refers to the initial end of the current flow in the branch 31; the "outlet end 33" refers to the end of the current flow in the branch 31, forming the neutral point of the branch 31.

[0097] The outermost outlet terminal 33 is connected to the first neutral point terminal 111, and the innermost outlet terminal 33 is connected to the second neutral point terminal 121. Thus, all outlet terminals 33 of the multi-phase winding form two rows of neutral points spaced apart in the radial direction, and the two rows of neutral points can be respectively connected to the first neutral bus 11 and the second neutral bus 12 spaced apart in the radial direction, thereby reducing the space occupied by the neutral points in the radial direction and facilitating the improvement of the electrical safety distance. In addition, the inlet terminal 32 of the same-phase winding is connected to the phase terminal 131 of the same-phase bus 13 in a one-to-one correspondence, so as to realize the parallel connection of the two branches 31 of the same-phase winding, thereby simplifying the structure of the bus assembly 10.

[0098] In some embodiments, Figure 1-Figure 2 and Figure 15-17 As shown, the branch 31 includes two sub-branches and two inter-branch terminals 34, one end of one of the sub-branches is an incoming line terminal 32 and the other end is connected to the inter-branch terminal 34, and one end of the other sub-branch is an outgoing line terminal 33 and the other end is connected to the other inter-branch terminal 34. Among the two inter-branch terminals 34, one inter-branch terminal 34 is located at the outermost layer in the corresponding stator slot 201, and the other inter-branch terminal 34 is located at the innermost layer in the corresponding stator slot 201 or is led by the innermost layer in the corresponding stator slot 201. The two inter-branch terminals 34 are directly or indirectly connected to realize the series connection of the entire branch 31 and realize the branch 31 to span between the outermost layer and the innermost layer of the stator slot 201.

[0099] For example Figure 2 and Fig.15 As shown, one inter-branch terminal 34 of the U1 branch 31 is located at the outermost layer of slot 9, and the other inter-branch terminal 34 is located at the innermost layer of slot 2, and the two are connected by the branch bus 15 to achieve crossover from the innermost layer to the outermost layer. One inter-branch terminal 34 of the U2 branch 31 is located at the outermost layer of slot 16, and the other inter-branch terminal 34 is located at the innermost layer of slot 9, and the two are connected by the branch bus 15.

[0100] It should be noted that in the embodiment where another inter-branch terminal 34 is located at the innermost layer in the corresponding stator slot 201, the two inter-branch terminals 34 can be connected through the branch bus 15 to achieve indirect connection. Alternatively, another inter-branch terminal 34 can be led out from the innermost layer in the corresponding stator slot 201, and the led inter-branch terminal 34 can extend radially outward and be connected to one of the inter-branch terminals 34 to achieve direct connection between the two inter-branch terminals 34. The connection of the two inter-branch terminals 34 only requires one connection operation, which can simplify the operation process.

[0101] For example, in some specific embodiments, Figure 3 As shown, all branch terminals 34 are connected through branch busbars 15, and the corresponding busbar brackets 14 wrap all branch busbars 15; for another example, Figure 3 The two branch busbars 15 at the two circumferential ends are omitted and replaced by two inter-branch terminals 34 that are directly connected. The circumferential length of the corresponding busbar bracket 14 can be reduced to reduce costs and occupy less space.

[0102] In some embodiments including the busbar support 14, such as Figure 2 and Figure 9-10As shown, the inter-branch terminal 34 can be inserted into the slot 142 of the bus bracket 14, which not only prevents interference with the bus bracket 14, but also can utilize the bus bracket 14 to protect the connection structure between the inter-branch terminal 34 and the branch terminal 152, thereby improving stability.

[0103] In some embodiments of the present invention, Figure 15-17 As shown, the branch 31 includes two sub-branches, the two ends of which are respectively located at the innermost layer and the outermost layer of different stator slots 201, and the end of one sub-branch located at the innermost layer is connected to the end of the other sub-branch located at the outermost layer. Fig.15 In the U1 branch 31, one end of one sub-branch is located at the L1 layer of slot 10 and the other end is located at the L8 layer of slot 2, and one end of another sub-branch is located at the L1 layer of slot 9 and the other end is located at the L8 layer of slot 3, wherein the end located at the L8 layer of slot 2 is connected to the end located at the L1 layer of slot 9 to connect the two sub-branches in series. In addition, the sub-branch includes an in-slot conductor located in the stator slot 201 and an out-slot conductor located at both ends of the stator core 20 in the axial direction.

[0104] In one of the sub-branches, Fig.15 As shown by the solid line, at one axial end of the stator core 20, the slot conductor outside the slot connects the two slot conductors at a first pitch, and the two slot conductors located in the middle of the sub-branch series connection direction are connected by a first connecting conductor 35 at a second pitch; Fig.15 As shown by the middle dotted line, at the other axial end of the stator core 20, the slot outer conductor connects the two slot inner conductors at a third pitch.

[0105] In another sub-branch, Fig.15 As shown by the solid line, at one axial end of the stator core 20, the slot conductor outside the slot connects the two slot conductors at a first pitch, and the two slot conductors located in the middle of the sub-branch series connection direction are connected by a second connecting conductor 36 at a fourth pitch; Fig.15 As shown by the middle dotted line, at the other axial end of the stator core 20, the slot outer conductor connects the two slot inner conductors at a third pitch.

[0106] Among them, the second pitch is 1 pitch smaller than the first pitch, the third pitch is 2 pitch smaller than the first pitch, and the fourth pitch is 1 pitch larger than the first pitch. Fig.15 In the example shown, the first pitch is 7, the second pitch is 6, the third pitch is 5, and the fourth pitch is 8.

[0107] By adopting the above wiring method, the currents of the conductors in the multiple slots of the same branch 31 in the stator slot 201 of the same phase belt flow evenly, that is, the number of conductors in the slots with opposite current flows is the same, such as Fig.15In slots 9 and 10, the current direction of the conductors in the four slots of the U1 branch 31 is from one axial end to the other end, and the current direction of the conductors in the other four slots is from the other axial end to one end. As a result, the magnetic field formed by the branch 31 is not easy to generate circulating current, which is beneficial to improving the performance of the motor stator 100.

[0108] It should be noted that the number of stator slots 201 spanned by the slot-out conductor is the pitch (or span). Fig.15 As shown, the stator core 20 has 48 stator slots 201, which are numbered 1, 2, 3, ..., 47 and 48 in the circumferential direction of the stator core 20, and the slot outer conductors arranged in the L2 layer of the 15th slot and the L1 layer of the 22nd slot are connected, and the pitch is 7. The first connecting conductor 35 connects the L4 layer of the 3rd slot and the L5 layer of the 9th slot, and the pitch is 6; the second connecting conductor 36 connects the L4 layer of the 2nd slot and the L5 layer of the 10th slot, and the pitch is 8.

[0109] Fig.15 In the example shown, the specific connection method of U1 branch 31 is:

[0110] Slot 10 L1 → Slot 15 L2 → Slot 22 L1 → Slot 27 L2 → Slot 34 L1 → Slot 39 L2 → Slot 46 L1 → Slot 3 L2 → Slot 10 L3 → Slot 15 L4 → Slot 22 L3 → Slot 27 L4 → Slot 34 L3 → Slot 39 L4 → Slot 46 L3 → Slot 3 L4 →9th slot L5th floor→14th slot L6th floor→21st slot L5th floor→26th slot L6th floor→33rd slot L5th floor→38th slot L6th floor→45th slot L5th floor→2nd slot L6th floor→9th slot L7th floor→14th slot L8th floor→21st slot L7th floor→26th slot L8th floor→33rd slot L7th floor→38th slot L8th floor→45th slot L7th floor→2nd slot L8th floor→ Slot 9 L1 layer → Slot 14 L2 layer → Slot 21 L1 layer → Slot 26 L2 layer → Slot 33 L1 layer → Slot 38 L2 layer → Slot 45 L1 layer → Slot 2 L2 layer → Slot 9 L3 layer → Slot 14 L4 layer → Slot 21 L3 layer → Slot 26 L4 layer → Slot 33 L3 layer → Slot 38 L4 layer → Slot 45 L3 layer → Slot 2 L4 layer → 1 Slot 0, L5 layer → Slot 15, L6 layer → Slot 22, L5 layer → Slot 27, L6 layer → Slot 34, L5 layer → Slot 39, L6 layer → Slot 46, L5 layer → Slot 3, L6 layer → Slot 10, L7 layer → Slot 15, L8 layer → Slot 22, L7 layer → Slot 27, L8 layer → Slot 34, L7 layer → Slot 39, L8 layer → Slot 46, L7 layer → Slot 3, L8 layer.

[0111] The specific connection method of U2 branch 31 is:

[0112] Slot 8 L8 floor→Slot 3 L7 floor→Slot 44 L8 floor→Slot 39 L7 floor→Slot 32 L8 floor→Slot 27 L7 floor→Slot 20 L8 floor→Slot 15 L7 floor→Slot 8 L6 floor→Slot 3 L5 floor→Slot 44 L6 floor→Slot 39 L5 floor→Slot 32 L6 floor→Slot 27 L5 floor→Slot 20 L6 floor→Slot 15 L5 floor→ Slot 9 L4 floor → Slot 4 L3 floor → Slot 45 L4 floor → Slot 40 L3 floor → Slot 33 L4 floor → Slot 28 L3 floor → Slot 21 L4 floor → Slot 16 L3 floor → Slot 9 L2 floor → Slot 4 L1 floor → Slot 45 L2 floor → Slot 40 L1 floor → Slot 33 L2 floor → Slot 28 L1 floor → Slot 21 L2 floor → Slot 16 L1 floor → Slot 9 L8 floor→Slot 4 L7 floor→Slot 45 L8 floor→Slot 40 L7 floor→Slot 33 L8 floor→Slot 28 L7 floor→Slot 21 L8 floor→Slot 16 L7 floor→Slot 9 L6 floor→Slot 4 L5 floor→Slot 45 L6 floor→Slot 40 L5 floor→Slot 33 L6 floor→Slot 28 L5 floor→Slot 21 L6 floor→Slot 16 L5 floor→ Slot 8, L4 layer → Slot 3, L3 layer → Slot 44, L4 layer → Slot 39, L3 layer → Slot 32, L4 layer → Slot 27, L3 layer → Slot 20, L4 layer → Slot 15, L3 layer → Slot 8, L2 layer → Slot 3, L1 layer → Slot 44, L2 layer → Slot 39, L1 layer → Slot 32, L2 layer → Slot 27, L1 layer → Slot 20, L2 layer → Slot 15, L1 layer.

[0113] In other words, in the U1 branch 31, starting from the incoming line end 32, a fixed pitch is first adopted in units of L1 layer and L2 layer, and the welding end pitch (corresponding to Fig.15 The dashed line is 5, and the pitch of the inserted line segment (corresponding to Fig.15 The solid line is shown as 7, and the conductors in each slot are connected along the circumferential direction. The conductors are connected in the same way with L3 and L4 as units. After completing two rounds of conductor connection, the pitch of the 3rd slot L4 layer is changed to the 9th slot L5 layer between the L4 and L5 layers, and the conductor connection of the remaining 4 layers is completed with a fixed pitch. The line is led out from the 3rd slot L8 layer, corresponding to the outlet terminal 33 of the branch 31. The winding direction of the U2 branch 31 is similar to that of the U1 branch 31, which will not be repeated here.

[0114] In some embodiments, the number of slot layers in the same stator slot 201 is greater than or equal to 4, in other words, the number of conductors that can be accommodated in the slot is greater than or equal to 4, so that there is enough space in the stator slot 201 to arrange the first connecting conductor 35 and the second connecting conductor 36 to achieve pitch change, thereby improving the effect of reducing circulating current.

[0115] In some embodiments, the number of stator slots 201 includes but is not limited to Figure 15-17 The 48 slots shown can also be 54 slots or 72 slots, etc., which are all within the protection scope of the present invention.

[0116] In some embodiments of the present invention, Figure 2 As shown, a slot insulator 21 is further provided in the stator slot 201 , and the slot insulator 21 wraps the conductor in the slot to insulate the conductor in the slot from the stator core 20 .

[0117] like Fig.18 As shown, the motor 200 according to the embodiment of the present invention comprises the motor stator 100 according to the embodiment of the present invention. Its beneficial effects are the same as those of the motor stator 100 according to the embodiment of the present invention, and will not be described in detail here.

[0118] The powertrain according to the embodiment of the present invention includes the motor 200 according to the embodiment of the present invention. The beneficial effects thereof are the same as those of the motor 200 according to the embodiment of the present invention, and will not be described in detail here.

[0119] Here, the powertrain refers to a series of component integrated structures on the vehicle 1000 for generating power to drive the vehicle 1000. For example, the powertrain may include a motor 200, a transmission, and other components integrated into the transmission, such as a clutch, a differential, etc., so that the motor 200 serves as the main driving force of the vehicle 1000; for another example, the powertrain may also include an internal combustion engine, so that the internal combustion engine and the motor 200 serve as the main driving force at the same time. Regarding the internal combustion engine and the motor 200 that provide driving power at the same time mentioned in the above embodiments, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to the motor 200 can use power batteries, hydrogen fuel cells, etc., which are not specifically limited here.

[0120] like Fig.18 As shown, the vehicle 1000 according to the embodiment of the present invention includes the powertrain according to the embodiment of the present invention. Its beneficial effects are the same as those of the powertrain according to the embodiment of the present invention, and will not be repeated here.

[0121] Here, the vehicle 1000 may be a new energy vehicle. In some embodiments, the new energy vehicle may be a pure electric vehicle with the motor 200 as the main driving force. In other embodiments, the new energy vehicle may also be a hybrid vehicle with both the internal combustion engine and the motor 200 as the main driving force. It should be noted that this is only an exemplary description of the structure of the new energy vehicle, etc., and does not limit the protection scope of the present invention.

[0122] The motor 200 , the powertrain, and other components and operations of the vehicle 1000 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail herein.

[0123] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0124] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0125] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A busbar assembly for a motor stator, characterized in that: include: A first neutral busbar, wherein the first neutral busbar comprises a plurality of first neutral point terminals and a first busbar body connecting the plurality of first neutral point terminals, wherein the plurality of first neutral point terminals are arranged along the circumferential direction of the motor stator; A second neutral busbar, the second neutral busbar comprising a plurality of second neutral point terminals and a second busbar body connecting the plurality of second neutral point terminals, the plurality of second neutral point terminals being arranged along the circumferential direction of the motor stator and being located radially inward of the first neutral point terminal; A plurality of phase busbars, each of which comprises a plurality of phase terminals and a third busbar body connecting the plurality of phase terminals, wherein: The first busbar body, the second busbar body and the plurality of third busbar bodies are all located between the first neutral point terminal and the second neutral point terminal, and have a width direction and a thickness direction that are perpendicular to each other. The thickness direction of the first busbar body and the second busbar body is perpendicular to the axial direction of the motor stator, and at least one of the third busbar bodies includes a first part with a thickness direction parallel to the axial direction, and the first part is located on one axial side of the first busbar body and the second busbar body.

2. The busbar assembly of the motor stator according to claim 1, characterized in that: A plurality of the third bus-bar bodies are arranged circumferentially, any two adjacent third bus-bar bodies are partially staggered circumferentially and the non-staggered portions are arranged axially, one of the non-staggered portions is the first portion, and the other of the non-staggered portions is the second portion whose thickness direction is perpendicular to the axial direction of the motor stator.

3. The busbar assembly of the motor stator according to claim 1 or 2, characterized in that: The first busbar body and the second busbar body have facing portions facing each other in the radial direction, and a portion of the third busbar body that is opposite to the facing portions in the axial direction is the first portion.

4. The busbar assembly of the motor stator according to claim 1, characterized in that: A portion of the phase terminals and the first neutral point terminals are arranged along a first circumference of the motor stator, and another portion of the phase terminals and the second neutral point terminals are arranged along a second circumference of the motor stator and are located radially inward of the first neutral point terminal.

5. The busbar assembly of the motor stator according to claim 4, characterized in that: Also includes: A branch busbar for connecting two sub-branches of the motor stator, the branch busbar comprising a middle busbar body and two branch terminals, the two branch terminals are respectively connected to the radial inner end and the radial outer end of the middle busbar body, and the two branch terminals are respectively used to connect to the two sub-branches, wherein: The thickness direction of the middle busbar body is parallel to the axial direction of the motor stator and is located on one axial side of the first busbar body and the second busbar body. The two branch terminals are arranged along the first circumference and the second circumference respectively.

6. The busbar assembly of the motor stator according to claim 5, characterized in that: The first neutral point terminal is opposite to the phase terminal in the radial direction of the motor stator, the second neutral point terminal is opposite to the phase terminal in the radial direction of the motor stator, and the two branch terminals are opposite to each other in the radial direction of the motor stator.

7. The busbar assembly of the motor stator according to claim 1, characterized in that: The distance between the first neutral busbar and the adjacent phase busbar is greater than or equal to 2 mm; The distance between the second neutral busbar and the adjacent phase busbar is greater than or equal to 2 mm; The distance between two adjacent phase bus bars is greater than or equal to 2 mm.

8. The busbar assembly of the motor stator according to claim 1, characterized in that: The phase busbar further includes an input terminal disposed on one axial side of the third busbar body, and the input terminal is used to be connected to a power source.

9. The busbar assembly of the motor stator according to claim 1, characterized in that: include: A busbar support partially wraps the phase busbars, the first neutral busbar, and the second neutral busbar.

10. A motor stator, characterized in that: The invention comprises a stator core, a stator winding and a busbar assembly of a motor stator according to any one of claims 1 to 9, wherein the stator winding is mounted on the stator core, and the busbar assembly is electrically connected to the stator winding.

11. The motor stator according to claim 10, characterized in that: The stator core has a plurality of stator slots arranged along the circumferential direction, the stator winding includes a multi-phase winding, each phase of the winding includes two branches, wherein the incoming end of one branch and the outgoing end of another branch are both located at the outermost layer in the corresponding stator slot, wherein the outgoing end of one branch and the incoming end of another branch are both located at the innermost layer in the corresponding stator slot, the outgoing end of the outermost layer is connected to the first neutral point terminal, the outgoing end of the innermost layer is connected to the second neutral point terminal, and the incoming end of the same-phase winding is connected one-to-one with the phase terminal of the same phase bus.

12. The motor stator according to claim 11, characterized in that: The branch includes two sub-branches and two inter-branch terminals, wherein one end of one of the sub-branches is an incoming line end and the other end is connected to one of the inter-branch terminals, and one end of the other sub-branch is an outgoing line end and the other end is connected to another inter-branch terminal, wherein one of the inter-branch terminals is located at the outermost layer in the corresponding stator slot, wherein: Another of the inter-branch terminals is located in the innermost layer of the corresponding stator slot, and the two inter-branch terminals are connected by a branch bus; or, another of the inter-branch terminals extends radially outward from the innermost layer of the corresponding stator slot and is connected to one of the inter-branch terminals.

13. The motor stator according to claim 11, characterized in that: The branch includes two sub-branches, and the two ends of the sub-branches are respectively located at the innermost layer and the outermost layer of different stator slots, wherein the end of one sub-branch located at the innermost layer is connected to the end of the other sub-branch located at the outermost layer, and the sub-branch includes an in-slot conductor located in the stator slot and an out-slot conductor located at the axial ends of the stator core, In one of the sub-branches, at one axial end of the stator core, the slot-out conductor connects the two slot-in conductors at a first pitch, the two slot-in conductors located in the middle of the sub-branches in the series connection direction are connected by a first connecting conductor at a second pitch, and at the other axial end of the stator core, the slot-out conductor connects the two slot-in conductors at a third pitch; In another of the sub-branch, at one axial end of the stator core, the slot outer conductor connects the two slot inner conductors at a first pitch, the two slot inner conductors located in the middle of the sub-branch in the series connection direction are connected by a second connecting conductor with a fourth pitch, and at the other axial end of the stator core, the slot outer conductor connects the two slot inner conductors at a third pitch, wherein, The second pitch is smaller than the first pitch by 1 pitch, the third pitch is smaller than the first pitch by 2 pitches, and the fourth pitch is larger than the first pitch by 1 pitch.

14. A motor, characterized in that: The invention comprises a motor stator according to any one of claims 10-13.

15. A powertrain, characterized in that: Comprising an electric machine according to claim 14.

16. A vehicle, characterized in that: Comprising a powertrain according to claim 15.

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