Electric drive system and vehicle

Abstract

The invention provides an electric driving system and a vehicle, the electric driving system comprises a shell, a motor, a controller and a transmission are arranged in the shell, and the motor comprises a stator and a rotor; the first electric connector is arranged in the shell, is positioned at the wire outlet end of the stator and is electrically connected with the controller; the second electric connector is arranged in the shell, is positioned at the wire outlet end of the stator and is electrically connected with the stator; the cooling system comprises a cooling channel arranged on the shell; and the coolant distribution assembly is communicated with the cooling channel, at least one first hole is formed in the coolant distribution assembly, so that a coolant flows to the first electric connector through the at least one first hole, and at least one second hole is formed in the coolant distribution assembly, so that the coolant flows to the second electric connector through the at least one second hole.

Description

Technical Field

[0001] The present disclosure relates to an electric drive system and a vehicle. Background Art

[0002] The electric drive system of an existing automobile is generally equipped with a special cooling system for cooling the motor in the electric drive system. Usually, the cooling system can use a coolant such as water or oil for cooling. In a system based on water cooling, the cooling water is generally in contact with the housing of the motor, and takes away the heat inside the motor by heat transfer. In a system based on oil cooling, the cooling oil can be directly sprayed into the inside of the motor. In some known cooling systems, pipes for transmitting cooling oil are generally provided, and lubricating oil can be used as cooling oil. Specifically, in some oil cooling systems, a plurality of injection pipelines are provided in the housing of the electric drive system, and these pipelines are provided on the outside of the stator, and cooling oil can be directly sprayed onto the stator of the motor.

[0003] In various existing three-in-one electric drive systems, the motor, various electrical devices such as the motor controller, and the gearbox are integrated into one product. An electrical connector for electrically connecting the motor to the motor controller is provided in the housing of the product. The electrical connector generates heat during operation, becoming the main heat source in the electric drive system and needs to be cooled as quickly as possible. However, the known cooling system cannot directly cool the electrical connector, and most of the coolant cannot directly contact the electrical connector, so the cooling efficiency of the system is not high.

[0004] Therefore, the art needs an electric drive system that can solve the above problems. Summary of the invention

[0005] Therefore, the purpose of the present disclosure is to provide an electric drive system and a vehicle, wherein the cooling system of the electric drive system can supply coolant directly to the electrical connector, has high cooling efficiency, high system integration, simple and compact structure, and low cost.

[0006] The above objects are achieved by the electric drive system and vehicle described below.

[0007] The present disclosure relates to an electric drive system, which includes: a housing, in which a motor, a controller and a transmission are arranged, wherein the motor includes a stator and a rotor; a first electrical connector, which is arranged in the housing, located at the outlet of the stator and electrically connected to the controller; a second electrical connector, which is arranged in the housing, located at the outlet of the stator and electrically connected to the stator; and a cooling system, including: a cooling channel arranged on the housing; and a coolant distribution assembly, which is connected to the cooling channel and is provided with at least one first hole so that the coolant flows to the first electrical connector via the at least one first hole, and is also provided with at least one second hole so that the coolant flows to the second electrical connector via the at least one second hole. The design of the above-mentioned first hole and the second hole enables the present disclosure to achieve direct cooling of the electrical connector, thereby improving the cooling efficiency.

[0008] The electric drive system according to the present disclosure may also have one or more of the following features alone or in combination.

[0009] In one embodiment, the coolant distribution assembly includes a protrusion extending along the central axis of the motor toward the first electrical connector, and the first hole is provided on the protrusion. By providing the protrusion, the distance between the first hole and the component requiring coolant can be reduced to achieve direct injection of a fluid at a certain speed.

[0010] In one embodiment, the coolant flows out through the second hole in a direction transverse to the central axis of the motor. In this way, the second electrical connector can be directly cooled without intermediate conduction, so the cooling efficiency is higher.

[0011] In one embodiment, the housing is provided with at least one guide component extending toward the connection terminal of the first electrical connector for guiding the coolant. The guide component can change the flow direction of the coolant, is applicable to different system structures, and has higher flexibility.

[0012] In one embodiment, each of the guide components is formed by a rib on the housing, which makes the system highly integrated and the structure simple and compact.

[0013] In one embodiment, each of the guide components is formed by two ribs and the two ribs gradually approach each other in a direction toward the corresponding connection terminal, and the ribs are arranged on the end wall of the housing. Through such converging guide components, not only can the flow direction of the coolant be changed, but the coolant can also be concentratedly guided to the corresponding connection terminal.

[0014] In one embodiment, the first hole is at a distance from the corresponding guide component, and the distance is selected so that the coolant is sprayed onto the corresponding guide component through the first hole. This allows the coolant to be sprayed onto the corresponding guide component at a certain speed, making the structure more compact.

[0015] In one embodiment, the coolant directly contacts the first electrical connector through at least one of the first holes, which makes the system structure simpler and more compact.

[0016] In one embodiment, the first hole corresponds to the connection terminal of the first electrical connector. In this way, the coolant can be applied to the corresponding connection terminal of the first electrical connector in a targeted manner, so that the connection terminal of the first electrical connector can be directly cooled without intermediate conduction, so the cooling efficiency is higher.

[0017] In one embodiment, a third hole is provided on the coolant distribution assembly so that the coolant flows to the stator through the third hole, so as to achieve cooling inside the motor.

[0018] The present disclosure also relates to a vehicle, which includes the electric drive system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The advantages and purposes of the present disclosure can be better understood from the preferred embodiments of the present disclosure described in detail below in conjunction with the accompanying drawings. In order to better show the relationship between the various components in the accompanying drawings, the accompanying drawings are not drawn to scale. In the accompanying drawings:

[0020] Figure 1 A schematic diagram showing an electric drive system for a vehicle according to an embodiment of the present disclosure is shown;

[0021] Figure 2 Shown according to Figure 1 A schematic diagram of the electric drive system shown in another direction;

[0022] Figure 3 A schematic diagram showing a portion of an electric drive system according to an embodiment of the present disclosure;

[0023] Figure 4 A schematic diagram showing a housing of an electric drive system according to an embodiment of the present disclosure is shown;

[0024] Figure 5 A schematic diagram showing a coolant distribution assembly of a cooling system of an electric drive system according to another embodiment of the present disclosure is shown;

[0025] Figure 6 Shown according to Figure 5 A schematic diagram of another orientation of the coolant distribution assembly shown;

[0026] Figure 7 Shown according to Figure 5 A schematic cross-sectional view of a coolant distribution assembly is shown;

[0027] Figure 8 A schematic diagram showing a coolant distribution assembly, a first connector, and a second connector of an electric drive system according to another embodiment of the present disclosure; and

[0028] Fig. 9 Shown according to Figure 8 A schematic diagram of the coolant distribution assembly, the first connector and the second connector in another orientation is shown. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in combination with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0030] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include", "comprise" or "have" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to the physical or mechanical connections or connections shown in the drawings, but may include connections or connections equivalent thereto, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] Below, see Figures 1 to 9 Various embodiments of the present disclosure are described in detail.

[0032] Figure 1The electric drive system for a vehicle according to an embodiment of the present disclosure is shown, which includes a housing 1, in which components such as a motor, a controller, and a transmission are arranged. In some embodiments, the housing 1 can be a one-piece housing, or it can be composed of two or more housing components assembled together by fastening, welding, etc. Figure 1 As shown, the motor is disposed in a cavity defined by the main body of the housing 1, the controller is disposed in a cavity indicated by 18 in the figure and located at the top of the main body of the housing 1, and the transmission is disposed in a cavity indicated by 17 in the figure and located at one end of the main body of the housing 1. In the illustrated embodiment, the cavities of the housing 1 accommodating the motor, the transmission, and the controller are connected. Lubricating oil may be present in the cavity indicated by 17 in the figure, and may be closed by an additional cover. Figure 2 Shown according to Figure 1 The schematic diagram of the electric drive system in another direction is shown, and the central axis A of the motor is shown with a dotted line, and the cooling channels 3 and 4 arranged on the housing 1 are also shown.

[0033] Figure 3 A portion of an electric motor is shown, which includes a stator 2 and a rotor (not shown in the figure). The stator 2 and the rotor are both sealed in a housing 1, and the rotor is located inside the stator 2. The rotor includes a rotatable shaft and a rotor core disposed on the shaft and composed of a plurality of metal laminations (e.g., silicon steel sheets), wherein the shaft extends along the central axis A described above. The stator 2 includes a stator core composed of a plurality of metal laminations (e.g., silicon steel sheets) and a winding 19 disposed thereon. The stator core has a generally cylindrical structure, which accommodates the rotor. In addition, the stator includes a stator outlet terminal 8, at which the stator winding 19 can be electrically connected to an external electrical component. It should be noted that Figure 3 The position of the outlet terminal 8 is only schematically shown, and the actual position may deviate from the position shown in the figure. The winding 19 can generate a rotating magnetic field after the three-phase alternating current is passed through it, thereby generating an electromagnetic torque to drive the rotor to rotate. The winding 19 can be embedded in the slot of the stator according to a certain rule and form a bun at the end of the stator. In addition, in some examples, the motor of the present disclosure may also include a pump not shown here, which is used to pump the lubricating oil from the transmission to the cooling system of the electric drive system as a coolant. See again Figure 3 The electric drive system further includes a first electrical connector 5, a second electrical connector 6 and a cooling system. The first electrical connector 5 is disposed in the housing 1, located at the stator output terminal 8, and is electrically connected to the controller. The first electrical connector 5 may also be referred to as an AC busbar, which may be electrically connected to a controller, such as an inverter. Return to see Figure 1, the first electrical connector 5 can extend from the cavity indicated by 17 to the cavity indicated by 18. The second electrical connector 6 is arranged in the housing 1, located at the outlet terminal 8 of the stator, and is electrically connected to the stator 2. The second electrical connector 6 can also be called a stator bus bar or a winding bus bar. The cooling system includes the cooling channels 3, 4 and the coolant distribution assembly 7 arranged on the housing 1 as described above.

[0034] Figures 5 to 9 The specific structure of the coolant distribution assembly 7 is shown. The coolant distribution assembly 7 may be an annular structure, and may also be called an oil ring when the coolant is oil. The coolant distribution assembly 7 may have a main body with a hollow interior, and the main body forms a cavity for accommodating the coolant. The main body of the coolant distribution assembly 7 is provided with a mounting portion extending radially toward the central axis A, and a mounting hole 21 is provided thereon. The coolant distribution assembly 7 can be fixed to the housing 1 by passing a fastener such as a screw through the mounting hole 21. A plurality of mounting portions may be evenly distributed in the circumferential direction of the coolant distribution assembly 7. In addition, the coolant distribution assembly 7 has a coolant inlet 20, which is connected to the cooling channel 3 on the housing 1. That is, the coolant distribution assembly 7 can be connected to the cooling channel 3 to receive the coolant from the cooling channel 3. As shown in the various figures, the coolant distribution assembly 7 is provided with at least one first hole 10 and at least one second hole 11 as coolant outlets, and these outlets are provided on the main body of the coolant distribution assembly 7 and open in different directions. At least one first hole 10 allows the coolant to flow to the first electrical connector 5 via the at least one first hole 10. At least one second hole 11 allows the coolant to flow to the second electrical connector 6 via the at least one second hole 11. In addition, at least one third hole 9 is provided on the coolant distribution component 7, and the third hole 9 allows the coolant to flow to the stator 2 via the third hole 9. The third holes 9 can be distributed in the circumference of the coolant distribution component 7. The above three different hole designs enable the coolant distribution component 7 of the present disclosure to achieve direct cooling of the inside of the motor and the electrical connector, thereby improving the cooling efficiency.

[0035] Specifically, if Figure 3 As shown, the coolant distribution assembly 7 includes a protrusion 15 extending along the central axis A of the motor toward the first electrical connector 5. Figure 5 and 6 As shown, the first hole 10 is arranged on the protrusion 15. The protrusion 15 may have a recessed section to avoid the housing 1 or the structure inside the housing 1. By providing the protrusion, the distance between the first hole and the component requiring coolant can be shortened to achieve direct injection of a fluid at a certain speed.

[0036] like Figure 5 and 8As shown, the first holes 10 correspond to the connection terminals 16, 16', 16" of the first electrical connector 5, respectively. The three connection terminals 16, 16', 16" are three-phase connection terminals, namely, a U-phase connection terminal, a V-phase connection terminal and a W-phase connection terminal. Therefore, the number of first holes 10 can be three. However, other numbers of first holes are also possible, such as one or two. Coolant can be sprayed to the corresponding connection terminals through the first holes 10. In this way, the coolant can be applied to the corresponding connection terminals of the first electrical connector in a targeted manner, so that the connection terminals of the first electrical connector can be directly cooled without the need for intermediate conduction, so that the cooling efficiency is higher.

[0037] In addition, if Figure 6 and 7 As shown, the second hole 11 can also be provided on the protrusion 15. The coolant flows out through the second hole 11 in a direction transverse to the central axis A of the motor. Specifically, the second hole 11 is open downward. The position of the second hole 11 corresponds to the second electrical connector 6, so that the coolant is directly sprayed onto the second electrical connector 6 through the second hole 11. Figure 6 Three second holes 11 are shown in the figure, which is only exemplary, and other numbers are also possible, such as one or two. For example, more second holes 11 can be provided according to cooling requirements. In this way, the second electrical connector can be directly cooled without intermediate conduction, so the cooling efficiency is higher.

[0038] like Figure 4 As shown, at least one guide component 12, 12' for guiding the coolant and extending toward the connecting terminal of the first electrical connector 5 is provided on the housing 1. Specifically, the guide component 12 extends toward the connecting terminal 16 of the first electrical connector 5, and the guide component 12' extends toward the connecting terminal 16' of the first electrical connector 5. In addition, the coolant can directly contact the first electrical connector 5 through at least one of the first holes 10. Specifically, for the connecting terminal 16'' of the first electrical connector 5, the coolant can be directly sprayed to the connecting terminal 16'' of the first electrical connector 5 through the first hole 10. The guide component can change the flow direction of the coolant, which is suitable for different system structures and has higher flexibility.

[0039] For example, each of the guide components 12 and 12' is formed by a rib 13 on the housing 1. The rib 13 can be formed integrally with the housing 1. Each of the guide components 12 and 12' is formed by two ribs 13 and the two ribs 13 gradually approach each other in the direction toward the corresponding connection terminal 16 and 16', specifically, forming a tapered guide groove or guide channel toward the corresponding connection terminal 16 and 16'. Specifically, the two ribs 13 are Figure 4The ribs 13 may be arranged on the end wall 14 of the housing 1 .

[0040] After the coolant flows out from the first hole 10 in a direction parallel to the central axis A, it directly contacts the guide components 12, 12', and then is directed to the connection terminals of the first electrical connector 5 by the guide components. By forming the guide components with ribs on the housing, the system integration can be improved, and the structure can be simple and compact. By using such a converging guide component, not only can the flow direction of the coolant be changed, but the coolant can also be concentratedly guided to the corresponding connection terminals.

[0041] Combination Figure 3 and 9 It can be seen that along the central axis A, the first hole 10 is at a distance from the corresponding guide member 12, which is selected so that the coolant is sprayed through the first hole 10 onto the corresponding guide member 12, 12', especially at a certain speed. This makes the structure more compact.

[0042] In addition, in some examples, the coolant injection velocity at each of the first hole 10, the second hole 11, and the third hole 9 is 1.3 m / s. The diameter of each of the first hole 10, the second hole 11, and the third hole 9 may be 1.5 to 2.5 mm. The distance between the first hole 10 and the corresponding guide component 12 is, for example, 15 to 30 mm. Through simulation experiments, it can be seen that the above specific structure greatly improves the cooling efficiency of the electric drive system, and the system has a higher degree of integration and a simpler and more compact structure.

[0043] The cooling system equipped with the electric drive system as described above can supply coolant directly to the electrical connector, has high cooling efficiency, high system integration, simple and compact structure, and low cost.

[0044] The vehicle of the present disclosure includes an electric drive system as described above. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a range extended electric vehicle (Range extended EV), or a fuel cell vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle. It should be understood that the vehicle of the present disclosure also has the advantages described above with respect to the electric drive system.

[0045] In addition, the technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the present disclosure.

Claims

1. An electric drive system, characterized in that, the electric drive system includes: a housing (1) in which a motor, a controller and a transmission are provided, wherein the motor includes a stator (2) and a rotor; a first electrical connector (5) provided in the housing (1), located at the outgoing line end (8) of the stator, and electrically connected to the controller; a second electrical connector (6) provided in the housing (1), located at the outgoing line end (8) of the stator, and electrically connected to the stator (2); and a cooling system, including: a cooling channel (3) provided on the housing (1); and a coolant distribution assembly (7) communicating with the cooling channel (3), and having at least one first hole (10) provided thereon such that coolant flows through the at least one first hole to the first electrical connector (5), and further having at least one second hole (11) such that coolant flows through the at least one second hole to the second electrical connector (6).

2. The electric drive system according to claim 1, characterized in that, the coolant distribution assembly (7) includes a protrusion (15) extending along the central axis (A) of the motor towards the first electrical connector (5), and the first hole (10) is provided on the protrusion (15).

3. The electric drive system according to claim 1, characterized in that, the coolant flows out through the second hole (11) in a direction transverse to the central axis (A) of the motor.

4. The electric drive system according to claim 1, characterized in that, at least one guiding member (12, 12') for guiding the coolant is provided on the housing (1) and extends towards the connection terminal of the first electrical connector (5).

5. The electric drive system according to claim 4, characterized in that, each of the guiding members (12, 12') is formed by a rib portion (13) on the housing (1).

6. The electric drive system according to claim 5, characterized in that, each of the guiding members (12, 12') is formed by two of the rib portions (13), and the two rib portions (13) gradually approach each other in the direction towards the corresponding connection terminal, and the rib portions (13) are provided on the end wall (14) of the housing (1).

7. The electric drive system according to claim 4, characterized in that, the first hole (10) is spaced apart from the corresponding guiding member (12, 12') by a distance selected such that the coolant is sprayed onto the corresponding guiding member (12, 12') through the first hole (10).

8. The electric drive system according to claim 1, characterized in that, the coolant directly contacts the first electrical connector (5) through at least one of the first holes (10).

9. The electric drive system according to claim 1, characterized in that, the first hole (10) corresponds to the connection terminals (16, 16', 16") of the first electrical connector (5).

10. The electric drive system according to claim 1, characterized in that, A third hole (9) is provided in the coolant distribution assembly (7) such that coolant flows to the stator (2) via the third hole.

11. A vehicle, characterized in that the vehicle includes the electric drive system according to any one of claims 1 to 10.

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