Motor and vehicle power system

Abstract

The present application provides a motor, comprising a stator assembly and a rotor assembly. The stator assembly comprises: a stator core, provided with a winding slot; a winding, mounted in the winding slot, and winding end portions at two axial ends of the winding being exposed from end portions of the stator core; and a busbar, connected to the winding. The stator assembly further comprises a wire-out end sealing cover, which is arranged at one axial end of the stator core, and defines an outlet-end oil chamber together with the stator core. The top of the outlet-end oil chamber is provided with a wire outlet, and one side wall of the wire outlet is provided with an oil outlet. The height of the side wall of the wire outlet on which the oil outlet is provided is lower than the height of the other side walls of the wire outlet, and cooling oil in the outlet-end oil chamber can overflow through the oil outlet. The busbar extends out of the wire-out end sealing cover from the oil outlet, and the cooling oil overflowing from the oil outlet can cool the busbar. Also provided is a vehicle power system.

Description

Motor and vehicle power system TECHNICAL FIELD

[0001] The present application relates to the field of pure electric vehicles or hybrid electric vehicles, and in particular to a motor and vehicle power system. BACKGROUND

[0002] In one possible implementation, the motor includes a stator assembly, the stator assembly including a stator core, windings, bus bars, an outlet end sealing cover, and a non-outlet end sealing cover. The bus bars are connected to the windings, the outlet end sealing cover and the non-outlet end sealing cover are arranged at the axial ends of the stator core, the outlet end sealing cover and the stator core enclose an outlet end oil cavity, and the non-outlet end sealing cover and the stator core enclose an inlet end oil cavity.

[0003] The oil outlet mode of the outlet end oil cavity is to uniformly overflow in multiple directions from the top end opening of the outlet end sealing cover, so that the cooling oil can cool the stator core and the windings. However, the bus bars are difficult to fully contact with the cooling oil, resulting in poor cooling effect of the bus bars. This may cause the insulation material to melt and fail or the welding point to melt, thereby affecting the normal operation of the motor.

[0004] SUMMARY

[0005] Therefore, the present application aims to provide a motor with good cooling effect of bus bars. The present application also provides a vehicle power system including the motor.

[0006] An embodiment of the present application provides a motor, including a stator assembly and a rotor assembly, the stator assembly including:

[0007] a stator core, the stator core being provided with winding slots;

[0008] windings, the windings being installed in the winding slots, winding end portions at the axial ends of the windings being exposed from the ends of the stator core; and

[0009] bus bars, the bus bars being connected to the windings,

[0010] the stator assembly further including an outlet end sealing cover, the outlet end sealing cover being arranged at one axial end of the stator core, the outlet end sealing cover and the stator core enclosing an outlet end oil cavity,

[0011] a top portion of the outlet end oil cavity being provided with an outlet opening, one side wall of the outlet opening being provided with an oil outlet, the height of the side wall of the outlet opening provided with the oil outlet being lower than the height of other side walls of the outlet opening, cooling oil in the outlet end oil cavity being able to overflow via the oil outlet, the bus bars extending out of the outlet end sealing cover from the oil outlet, and the cooling oil overflowing from the oil outlet being able to cool the bus bars.

[0012] In at least one possible implementation, the stator assembly further comprises an oil guide, the oil guide is formed with at least one oil channel through which the cooling oil can flow, a portion of the busbar is located in the oil channel, one end of the oil channel is communicated with the oil outlet, and the oil channel can receive the cooling oil flowing out of the oil outlet.

[0013] In at least one possible implementation, the oil guide comprises a plurality of oil distribution surfaces and a plurality of oil channels, the oil distribution surfaces are all inclined relative to the horizontal plane, the plurality of oil distribution surfaces have different inclination angles, and the plurality of oil distribution surfaces and the plurality of oil channels are connected in one-to-one correspondence.

[0014] In at least one possible implementation, the plurality of oil channels are arranged in parallel with each other, and / or

[0015] The plurality of oil channels extend along the vertical direction.

[0016] In at least one possible implementation, the oil guide comprises a main oil guide surface, a first oil guide surface, a second oil guide surface, a first oil channel, and a second oil channel, the first oil guide surface and the second oil guide surface are both arranged on the downstream side of the main oil guide surface, the main oil guide surface, the first oil guide surface, and the second oil guide surface are all inclined relative to the horizontal plane,

[0017] the first oil channel is connected to the downstream side of the first oil guide surface, the first oil channel can receive the cooling oil flowing out of the first oil guide surface, the second oil channel is connected to the downstream side of the second oil guide surface, and the second oil channel can receive the cooling oil flowing out of the second oil guide surface,

[0018] the inclination angles of the first oil guide surface and the second oil guide surface are different.

[0019] In at least one possible implementation, the wire outlet sealing cover comprises:

[0020] an outer peripheral wall, the outer peripheral wall is an incomplete cylinder with a gap, and the wire outlet is located at the gap position of the outer peripheral wall;

[0021] an inner peripheral wall, the inner peripheral wall is a cylinder, and the inner peripheral wall is located on the radially inner side of the outer peripheral wall; and

[0022] an end wall, the inner peripheral wall and the outer peripheral wall are both connected to the end wall.

[0023] In at least one possible implementation, the motor further comprises a motor housing, the motor housing is provided with a partition plate perpendicular to the axial direction of the motor, the partition plate can block the axial inner side of the wire outlet sealing cover, so that the cooling oil cannot flow out from the axial inner side of the wire outlet sealing cover.

[0024] In at least one possible implementation, one or more axial sides of the oil channel are defined by the partition plate; and / or

[0025] The other axial side of the oil channel is defined by an end cover of the motor.

[0026] In at least one possible implementation, the cross section of at least one oil channel of the oil guide is U-shaped, and the one or more busbars are inserted into the oil channel from the opening of the U-shape.

[0027] The embodiments of the present application also provide a vehicle power system comprising the motor as described in any one of the above technical solutions.

[0028] The cooling oil in the outlet end oil cavity is directed to overflow through the oil outlet of the outlet end sealing cover, so that the cooling oil can flow through the busbar, the cooling effect of the busbar is good, and motor failure caused by excessively high temperature of the busbar is avoided.

[0029] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and serve to explain the principles of the present application.

[0031] FIG. 1 shows a schematic diagram of the internal structure of a motor of a vehicle power system according to an embodiment of the present application.

[0032] FIG. 2 shows a schematic diagram of the internal structure of a motor of a vehicle power system according to an embodiment of the present application (without showing the busbar and the outlet end sealing cover).

[0033] FIG. 3 shows a schematic diagram of the internal structure of a motor of a vehicle power system according to an embodiment of the present application, which is partially enlarged.

[0034] FIG. 4 shows a schematic diagram of the internal structure of a motor of a vehicle power system according to an embodiment of the present application, which is partially enlarged (without showing the busbar).

[0035] FIG. 5 shows a schematic diagram of a stator assembly of a motor of a vehicle power system according to an embodiment of the present application.

[0036] FIG. 6 shows a schematic diagram of a stator assembly of a motor of a vehicle power system according to an embodiment of the present application, from another angle.

[0037] FIG. 7 shows a partial sectional view of a motor of a vehicle power system according to an embodiment of the present application.

[0038] Fig. 8 shows a structural schematic view of an outgoing terminal sealing cover of the motor of the vehicle power system according to an embodiment of the present application.

[0039] Fig. 9 shows a structural schematic view of the outgoing terminal sealing cover of the motor of the vehicle power system according to an embodiment of the present application from another angle.

[0040] Fig. 10 shows a structural schematic view of an oil guide of the motor of the vehicle power system according to an embodiment of the present application.

[0041] Fig. 11 shows an enlarged view of a part of Fig. 10.

[0042] Fig. 12 shows a structural schematic view of the oil guide of the motor of the vehicle power system according to an embodiment of the present application from another angle.

[0043] List of Reference Signs 100 Motor housing 101 Partition 1 Stator core 2 Winding 3 Busbar 31 U-phase busbar 32 V-phase busbar 33 W-phase busbar 34 Neutral-point busbar 4 Sealing cover 41 Outgoing terminal sealing cover 411 Inner circumferential wall 412 Outer circumferential wall 413 End wall 414 Extension section 42 Non-outgoing terminal sealing cover 5 Oil guide 51 Main oil guide surface 52 First oil guide surface 53 Second oil guide surface 54 First oil channel 541 First oil guide plate 55 Second oil channel 551 Second oil guide plate 56 Oil guide mounting hole DETAILED DESCRIPTION

[0044] Various example embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. Like reference numerals in the drawings denote like or similar elements. Although aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted.

[0045] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0046] In addition, for the purpose of convenience and brevity, detailed descriptions of well-known functions and structures incorporated in the present application can be omitted. It will be appreciated that where specific details of certain steps are given, other steps can be used in place of or in addition to the steps disclosed.

[0047] As shown in Figs. 1 to 12, an embodiment of the present application proposes a vehicle power system, which can be particularly applied to a pure electric vehicle or a hybrid electric vehicle. The vehicle power system includes a motor.

[0048] The motor includes a housing 100, a stator assembly and a rotor assembly. The stator assembly can be mounted to the housing 100, and the stator assembly can be disposed radially outward of the rotor assembly, which is rotatable relative to the stator assembly.

[0049] The stator assembly includes a stator core 1, windings 2, busbars 3, a seal cover 4 and oil guides 5.

[0050] As shown in FIGS. 5 and 6, the stator core 1 can be annular or cylindrical, and the stator core 1 can be formed by stacking a plurality of stator lamination sheets. The stator core 1 is provided with a plurality of winding slots, which are uniformly arranged along a circumferential direction C of the stator core 1. The winding slots extend through the stator core 1 along an axial direction A of the stator core 1, and are configured to accommodate the windings 2. Axial ends of the windings 2 can be exposed from axial ends of the stator core 1.

[0051] As shown in FIGS. 1, 3, 5 and 6, the busbars 3 can be connected to the windings 2 and a motor controller at two ends thereof, respectively. The busbars 3 can include three-phase busbars and a neutral busbar. The busbars 3 can be made of metal such as copper or copper alloy, and are also commonly referred to as copper bars. The busbars 3 can be provided in a plurality of (e.g., four) numbers.

[0052] The three-phase busbars can be connected to three-phase terminals of the stator assembly, and can include a U-phase busbar 31, a V-phase busbar 32 and a W-phase busbar 33. The neutral busbar 34 (or N-phase busbar) can be connected to a neutral terminal of the stator assembly.

[0053] As shown in FIGS. 5 and 6, the seal cover 4 includes an outlet terminal seal cover 41 (outlet end seal cover) and a non-outlet terminal seal cover 42 (inlet end seal cover). The outlet terminal seal cover 41 and the non-outlet terminal seal cover 42 are respectively provided at axial ends of the stator core 1. The non-outlet terminal seal cover 42 and the stator core 1 enclose an inlet end oil chamber, and the outlet terminal seal cover 41 and the stator core 1 enclose an outlet end oil chamber. The inlet end oil chamber and the outlet end oil chamber can be in communication through an axial oil passage of the stator core 1.

[0054] Cooling oil can enter the inlet end oil chamber from the non-outlet terminal seal cover 42, and then flow through the stator core 1 along an axial direction A of the motor to the outlet end oil chamber. In the inlet end oil chamber and the outlet end oil chamber, the winding ends 21 can be at least partially immersed in the cooling oil.

[0055] In one example, the seal cover 4 can be made of or include plastic, so as to facilitate sealing of the inlet end oil chamber and the outlet end oil chamber while reducing a weight of the stator assembly.

[0056] As shown in FIGS. 3 to 6, a top portion of the outlet terminal seal cover 41 is provided with an outlet port 43, and the busbars 3 can extend out of the outlet port 43 of the outlet terminal seal cover 41 and then extend laterally.

[0057] The side wall of the wire outlet 43 can be provided with an oil outlet 44, the height of the side wall of the wire outlet 43 provided with the oil outlet 44 is lower than the height of the other side walls of the wire outlet 43, and the cooling oil in the outlet end oil cavity can overflow through the oil outlet 44. The single arrow in FIG. 4 indicates the flow direction of the cooling oil.

[0058] As shown in FIGS. 8 and 9, the wire outlet end sealing cover 41 includes an inner peripheral wall 411, an outer peripheral wall 412, and an end wall 413. The inner peripheral wall 411 can be cylindrical, and can extend along the axial direction A and the circumferential direction C of the motor. The outer peripheral wall 412 can be an incomplete cylinder, and can extend along the axial direction A and the circumferential direction C of the motor, the upper portion of the outer peripheral wall 412 has a gap, and the outer peripheral wall 412 does not form a closed shape. The wire outlet 43 is located at the gap position of the outer peripheral wall 412. The end wall 413 can be a flat plate extending along the radial direction and the circumferential direction of the motor, and the inner peripheral wall 411 and the outer peripheral wall 412 are both connected to the end wall 413, and the inner peripheral wall 411 can be located radially inward of the outer peripheral wall 412.

[0059] The upper end of the outer peripheral wall 412 and the end wall 413 is provided with an extension section 414 extending (including substantially extending) flatly, for example, so that the lowest height of the top end of the wire outlet end sealing cover 41 is equal to or greater than the height of the top of the winding end portion 21, and the cooling oil in the outlet end oil cavity can be immersed in the winding end portion 21.

[0060] At the top end of the wire outlet end sealing cover 41, one extension section 414 of the outer peripheral wall 412 can form a gap, or the height of the one extension section 414 can be lower than the height of the other extension sections 414, thereby forming the oil outlet 44, and the cooling oil in the outlet end oil cavity can flow out from the lower oil outlet 44. The busbar 3 can extend transversely from the position where the oil outlet 44 is located, and can pass through and contact the busbar 3 when the cooling oil flows out of the stator assembly through the oil outlet 44, so that the cooling oil cools the busbar 3, and the cooling effect of the motor is better.

[0061] The outlet end oil cavity (or the oil outlet 44) is open, the oil outlet 44 is not connected to a pipeline or a joint, the oil pressure of the outlet end oil cavity can be small, close to atmospheric pressure, and when the cooling oil in the outlet end oil cavity accumulates to the oil outlet 44, the cooling oil can flow out of the stator assembly through the oil outlet 44. Because the oil pressure of the outlet end oil cavity is small, the requirement for sealing performance is low, the requirement for dimensional accuracy is low, the assembly is simple, and the cost of the motor is low.

[0062] As shown in FIG. 3 and FIG. 4, the housing 100 can be provided with a partition plate 101 perpendicular to the motor axial direction A, the partition plate 101 can block the axial inner side (the axial inner side refers to the side close to the axial middle position of the stator core or the stator assembly in the axial direction A) of the outgoing terminal seal cover 41, so that the cooling oil cannot flow out from the axial inner side of the outgoing terminal seal cover 41, but flows out of the outlet end oil cavity through the oil outlet 44.

[0063] As shown in FIG. 1 to FIG. 4, FIG. 7 and FIG. 10 to FIG. 12, the oil guide 5 can be installed on the housing 100, the oil guide 5 is formed with at least one oil channel, a portion of the busbar 3 is located in the oil channel, one end of the oil channel is communicated with the oil outlet 44, and the oil channel can receive the cooling oil flowing out of the oil outlet 44. Thus, the cooling oil can directly contact the busbar 3, and the cooling effect of the busbar 3 is better.

[0064] Further, the oil guide 5 can include a plurality of flow splitting surfaces (for example, the first oil guide surface 52 and the second oil guide surface 53). The plurality of flow splitting surfaces are all inclined relative to the horizontal plane, the plurality of flow splitting surfaces have different inclination angles respectively, the plurality of flow splitting surfaces and the plurality of oil channels are communicated one by one, and the plurality of busbars can be respectively arranged in the plurality of oil channels. By different inclination angles of the plurality of flow splitting surfaces, the flow rates and / or flow volumes of the cooling oil in the plurality of oil channels can be different as needed.

[0065] In the embodiment, as shown in FIG. 3, FIG. 4, FIG. 10 to FIG. 12, the oil guide 5 includes a main oil guide surface 51, a first oil guide surface 52, a second oil guide surface 53, a first oil channel 54, a second oil channel 55 and an oil guide mounting hole 56.

[0066] The main oil guide surface 51 can be arranged at the oil outlet 44, and the main oil guide surface 51 receives the cooling oil flowing out of the oil outlet 44. The first oil guide surface 52 and the second oil guide surface 53 can be arranged at the downstream side of the main oil guide surface 51, and the first oil guide surface 52 and the second oil guide surface 53 respectively receive a portion of the cooling oil flowing out of the main oil guide surface 51. The first oil channel 54 can be connected to the downstream side of the first oil guide surface 52, and the second oil channel 55 can be connected to the downstream side of the second oil guide surface 53. The first oil channel 54 can receive the cooling oil flowing out of the first oil guide surface 52, and the second oil channel 55 can receive the cooling oil flowing out of the second oil guide surface 53.

[0067] After the cooling oil overflowing from the oil outlet 44 passes through the main oil guide surface 51, a portion of the cooling oil enters the first oil channel 54 to cool two busbars 3, and another portion of the cooling oil enters the second oil channel 55 to cool another two busbars 3, and finally the cooling oil flows to the bottom of the motor housing 100.

[0068] The main oil surface 51, the first oil guide surface 52, and the second oil guide surface 53 can each be inclined with respect to a horizontal plane, and the cooling oil can flow downstream along the inclined surfaces of the oil guide surfaces under the action of gravity. The widths of the first oil guide surface 52 and the second oil guide surface 53 along the axial direction A of the motor are each smaller than the width of the main oil surface 51 along the axial direction A of the motor, and the widths of the first oil guide surface 52 and the second oil guide surface 53 can be the same (including substantially the same), and the sum of the widths of the first oil guide surface 52 and the second oil guide surface 53 can be equal to the width of the main oil surface 51.

[0069] The first oil guide surface 52 and the second oil guide surface 53 have different inclination angles. The inclination angles of the oil guide surfaces can be specifically set according to the distribution of the cooling oil, and the greater the inclination angle of the oil guide surface (closer to vertical), the faster the flow rate of the cooling oil flowing through the oil guide surface, and more cooling oil can be distributed to the oil channels downstream thereof.

[0070] The first oil channel 54 and the second oil channel 55 can be arranged in parallel, and the first oil channel 54 and the second oil channel 55 can extend along a vertical direction (including a substantially vertical direction). The widths of the first oil channel 54 and the second oil channel 55 along the axial direction A of the motor can be the same.

[0071] The first oil channel 54 can be defined by the first oil guide plate 541 on the lower side of the first oil guide surface 52 and the second oil guide plate 551 on the lower side of the second oil guide surface 53. In one example, the oil guide 5 can further include a connecting plate 57 connecting the first oil guide plate 541 and the second oil guide plate 551, and the oil guide mounting hole 56 can be formed in a portion of the connecting plate 57 located on the side of the first oil guide plate 541 close to the outlet end seal cover 41 and a portion extending upward from the second oil guide surface 53. In this example, the first oil channel 54 of the oil guide 5 can have a U-shaped cross section, and the busbar 3 can be inserted into the first oil channel 54 from the opening of the U-shaped cross section along the axial direction A of the motor. As shown in FIGS. 3 and 4, the first oil channel 54 or the first oil guide plate 541 can be separated from the outlet end seal cover 41 in at least a partial region.

[0072] The second oil channel 55 can be located on the side of the second oil guide plate 551 away from the first oil channel 54. An axial side (axial inner side) of the second oil channel 55 can be defined by the partition plate 101.

[0073] An axial other side (axial outer side) of the first oil channel 54 and the second oil channel 55 can also be defined by the end cover of the stator assembly (the housing).

[0074] In the above scheme, the first oil channel and the second oil channel have simple formation structures, and the flow space of the oil is properly constrained, and the cooling effect on the busbar is good.

[0075] The oil guide 5 can be provided with an oil guide mounting hole 56, and the oil guide 5 can be connected to the motor housing 100 by screwing bolts through the oil guide mounting hole 56 into the motor housing 100. In particular, the oil guide 5 can be connected to the partition plate 101 by bolts.

[0076] In one example, the oil guide 5 can be an injection molded part made of or including plastic, which not only insulates the oil guide 5 but also reduces the weight, and the structure and processing technology of the oil guide 5 are simple and low in cost.

[0077] The assembly steps of the motor of the present application are described below.

[0078] The oil guide 5 is mounted on the motor housing 100, in particular the partition plate 101, by a plurality of bolts.

[0079] The stator core 1 and the winding 2 are assembled into the motor housing 100, and the stator core 1 is fixed to the motor housing 100 by a plurality of bolts.

[0080] The busbars 3 are arranged, and the U-phase busbar 31 and the neutral-point busbar 34 are inserted into the first oil channel 54 of the oil guide 5, and the V-phase busbar 32 and the W-phase busbar 33 are inserted into the second oil channel 55 of the oil guide.

[0081] The busbars of the motor are connected to the busbars of the controller.

[0082] The motor and the vehicle power system of the present application can have the following beneficial effects.

[0083] (1) The cooling oil in the outlet end oil chamber is directed to overflow through the oil outlet 44 of the outlet end sealing cover 41, so that the cooling oil can flow through the busbars, and the motor failure caused by the excessive temperature of the busbars is avoided.

[0084] (2) The busbars are cooled by the cooling oil flowing out of the outlet end oil chamber, and no additional cooling oil supply is needed, which does not affect the power of the oil pump and the heat exchanger.

[0085] (3) The oil guide 5 not only guides the cooling oil to cool the busbars 5, but also limits the movement range of the busbars 5 to avoid displacement of the busbars 5 during vibration.

[0086] The present application is not limited to the above-described embodiments, and various modifications can be made to the above-described embodiments of the present application by those skilled in the art under the teachings of the present application without departing from the scope of the present application. In addition, the following is described.

[0087] (1) In the above-described embodiments, the oil guide 5 includes two oil channels, and each oil channel contains two busbars, but the present application is not limited thereto, and in other possible embodiments, the oil guide can have more or fewer oil channels, and the number of busbars contained in each oil channel can be allocated according to actual needs.

[0088] (2) In the above embodiment, the oil guide 5 is provided with the main oil guide surface 51 through which the cooling oil flowing out of the oil outlet 44 is received, but the present application is not limited thereto, and in other possible embodiments, the main oil guide surface can be provided to the outlet end seal cover, or no main oil guide surface is provided, and the cooling oil flowing out of the oil outlet 44 is directly received by the oil distribution surface.

[0089] (3) In the above embodiment, the U-phase busbar 31 and the neutral busbar 34 are embedded in the first oil passage 54, and the V-phase busbar 32 and the W-phase busbar 33 are embedded in the second oil passage 55, but the present application is not limited thereto, and in other possible embodiments, the plurality of busbars can be embedded in the oil passages in other combinations.

[0090] (4) In the above embodiment, the axial other side (axial outer side) of the first oil passage 54 and the second oil passage 55 can be defined by the end cover of the stator assembly (the housing). But the present application is not limited thereto, and in other possible embodiments, the axial other side (axial outer side) of the first oil passage and the second oil passage can be defined by a separate closure connected to the first oil guide plate and / or the second oil guide plate.

[0091] It should be understood that at least part of the aspects or features of the above embodiments, examples or examples can be appropriately combined.

[0092] It can be understood that in the present application, when the number of components or members is not particularly limited, the number can be one or more, and here, multiple refers to two or more. For the case where the number of components or members is described as a specific number such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limiting, and it can be understood as multiple, i.e. two or more, but this does not mean that the present application excludes the case of one.

[0093] Although the present application has been described in detail using the above embodiments, it is clear to those skilled in the art that the present application is not limited to the embodiments described in the specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the specification is for the purpose of example and does not have any limiting meaning on the present application.

Claims

1. An electric machine comprising a stator assembly and a rotor assembly, the stator assembly comprising: a stator core (1) provided with winding slots; windings (2) mounted in the winding slots, winding ends (21) at axial ends of the windings (2) being exposed from ends of the stator core (1); and a busbar (3) connected to the windings (2), characterized in that the stator assembly further comprises a terminal sealing cover (41) provided at an axial end of the stator core (1), the terminal sealing cover (41) and the stator core (1) enclosing a terminal oil chamber, a terminal opening (43) is provided at a top of the terminal oil chamber, a side wall of the terminal opening (43) is provided with an oil outlet (44), a height of the side wall of the terminal opening (43) provided with the oil outlet (44) is lower than a height of other side walls of the terminal opening (43), cooling oil in the terminal oil chamber can overflow via the oil outlet (44), and the busbar (3) extends out of the terminal sealing cover (41) from the oil outlet (44), and the cooling oil overflowing from the oil outlet (44) can cool the busbar (3). The stator assembly further comprises an oil guide (5) formed with at least one oil channel through which the cooling oil can flow, and a portion of the busbar (3) is located in the oil channel, and one end of the oil channel is communicated with the oil outlet (44). The oil guide (5) comprises a plurality of oil distribution surfaces and a plurality of oil channels, the oil distribution surfaces are all inclined relative to a horizontal plane, the plurality of oil distribution surfaces have different respective inclination angles, and the plurality of oil distribution surfaces and the plurality of oil channels are connected in one-to-one correspondence. The plurality of oil channels are arranged in parallel with each other, and / or The plurality of oil channels extend in a vertical direction. The oil guide (5) comprises a main oil guide surface (51), a first oil guide surface (52), a second oil guide surface (53), a first oil channel (54), and a second oil channel (55), the first oil guide surface (52) and the second oil guide surface (53) are both provided at a downstream side of the main oil guide surface (51), the main oil guide surface (51), the first oil guide surface (52), and the second oil guide surface (53) are all inclined relative to a horizontal plane, the first oil channel (54) is connected to a downstream side of the first oil guide surface (52), the first oil channel (54) can receive the cooling oil flowing along the first oil guide surface (52), the second oil channel (55) is connected to a downstream side of the second oil guide surface (53), the second oil channel (55) can receive the cooling oil flowing along the second oil guide surface (53), 2. The electric machine of claim 1, wherein, the inclination angles of the first oil guide surface (52) and the second oil guide surface (53) are different.

3. The electric machine of claim 2, wherein, The terminal sealing cover (41) comprises:

4. The electric machine of claim 3, wherein, an outer peripheral wall (412) which is an incomplete cylinder with a gap, and the terminal opening (43) is located at the gap position of the outer peripheral wall (412). ​ 5. The electric machine of claim 2, wherein, ​ ​ ​ 6. The electric machine of claim 1, wherein, ​ ​ an inner peripheral wall (411) which is cylindrical and which is located radially inside the outer peripheral wall (412); and an end wall (413) to which the inner peripheral wall (411) and the outer peripheral wall (412) are both connected.

7. The electric machine of claim 2, wherein, The motor further comprises a motor housing (100) provided with a partition (101) perpendicular to the axial direction (A) of the motor, which is capable of blocking the axial inner side of the wire outlet sealing cover (41) so that the cooling oil cannot flow out from the axial inner side of the wire outlet sealing cover (41).

8. The electric machine of claim 7, wherein, One or more axial sides of the oil channel are defined by the partition (101); and / or The other axial side of the oil channel is defined by an end cover of the motor.

9. The motor according to claim 2, wherein The cross section of at least one oil channel of the oil guide is U-shaped, and one or more busbars are inserted into the oil channel from the opening of the U-shaped cross section.

10. A vehicle powertrain system, characterized by, A motor according to any one of claims 1 to 9.

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