A housing assembly, an electric drive system, and a vehicle

Abstract

The application discloses a shell assembly, an electric drive system and a vehicle, and solves the technical problem that the existing electric drive system with an external motor controller is large in size and is not conducive to vehicle mounting. The shell assembly comprises two shell units of a shell main body and an upper shell, wherein the shell main body is provided with a motor cavity for accommodating a motor and a flow-through groove for cooling liquid flow, and the upper shell is arranged on the shell main body and cooperates with the shell main body to form a control cavity for accommodating a control assembly. The flow-through groove of the shell main body is of an open structure, and the groove opening of the flow-through groove faces the control cavity, so that the control assembly can directly contact the cooling liquid in the cooling flow channel and be effectively cooled. The shell assembly provided by the application deeply integrates the shell of the motor and the control assembly thereof, integrates the controller cooling assembly and the shell in the shell assembly, reduces the volume of the assembly, is conducive to mounting, reduces the controller cooling components, and reduces the cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric drive systems, and particularly relates to a shell assembly, an electric drive system and a vehicle. BACKGROUND

[0002] The motor controller of the electric drive system, especially the internal IGBT, generates a large amount of heat, which is not conducive to the service life. Therefore, a special water cooling plate is arranged in the controller to cool the IGBT, and cooling water circulation is performed through external pipelines.

[0003] In the existing electric drive system, the motor controller is installed as a separate module on the assembly and cooled by external pipelines to circulate cooling liquid to cool the IGBT. Such an external motor controller makes the entire electric drive system bulky, which is not conducive to being mounted on a vehicle. SUMMARY

[0004] To solve the above technical problems, the application provides a shell assembly, an electric drive system and a vehicle, which adopt an integrated shell to integrate the controller cooling assembly and the shell in the shell assembly of the electric drive system, so as to reduce the volume of the assembly.

[0005] The technical scheme adopted to achieve the object of the application is a shell assembly applied to an electric drive system provided with two or more motors, which comprises:

[0006] a shell main body provided with a motor cavity for accommodating the two or more motors and a flow-through groove for the flow of cooling liquid;

[0007] an upper shell arranged on the shell main body and enclosing the control cavity for accommodating the control assembly of the electric drive system with the shell main body, and the slot opening of the flow-through groove is communicated with the control cavity.

[0008] In some embodiments, the number of flow-through grooves is the same as the number of motors, and adjacent two flow-through grooves are communicated through a connecting pipe; the shell main body is provided with an inlet pipe and an outlet pipe communicated with the flow-through grooves.

[0009] In some embodiments, the inner wall of the flow-through groove is provided with heat dissipation bosses distributed at intervals.

[0010] In some embodiments, the shell main body is formed by high-pressure casting.

[0011] In some embodiments, the shell assembly is applied to a hybrid electric drive system; the shell main body comprises a right shell, a left shell and a rear end cover connected in sequence, the right shell and the left shell enclose a shaft tooth cavity for accommodating the shaft tooth assembly of the hybrid electric drive system, and the left shell and the rear end cover enclose the motor cavity.

[0012] At least one of the right shell, the left shell and the rear end cover and the upper shell enclose the control cavity.

[0013] In some embodiments, the left shell and the upper shell enclose the control cavity.

[0014] Based on the same inventive concept, the present application also provides an electric drive system, comprising:

[0015] The shell assembly described above;

[0016] Two or more electric machines arranged in the electric machine cavity of the shell assembly;

[0017] A control assembly arranged in the control cavity of the shell assembly and covering the slot opening of the flow-through groove to enclose a cooling flow channel with the flow-through groove.

[0018] In some embodiments, the control assembly comprises a control board and as many IGBT modules as the number of electric machines, and the IGBTs of the IGBT modules cover the slot opening of the flow-through groove.

[0019] In some embodiments, the surface of the IGBTs facing the slot opening is provided with heat dissipation bosses distributed at intervals.

[0020] In some embodiments, the control assembly further comprises a capacitor and a current sensor, and the capacitor and the current sensor are distributed side by side with the IGBT modules.

[0021] In some embodiments, the control assembly further comprises a bracket and a shielding plate, the bracket is connected to the upper shell, the control board and the shielding plate are both mounted on the bracket, and the shielding plate is located between the control board and the IGBT modules.

[0022] In some embodiments, the electric drive system is a hybrid electric drive system; the electric machine of the hybrid electric drive system is provided with two, which are a generator and a drive motor, and the generator and the drive motor are both in transmission connection with the shaft tooth set of the hybrid electric drive system.

[0023] In some embodiments, the hybrid electric drive system comprises a cooling circulation system; the cooling circulation system comprises a cooling water circulation subsystem for cooling the control assembly and a lubricating oil circulation subsystem for cooling and / or lubricating the electric machine and the shaft tooth set.

[0024] In some embodiments, the cooling water circulation of the cooling water circulation subsystem is configured as follows: water in the water tank is cooled by a cooling device and then enters the cooling channel to cool the control components; the cooling water discharged from the cooling channel returns to the water tank after passing through an oil-water heat exchanger, thus forming a cooling water circulation.

[0025] The lubricating oil circulation subsystem is configured as follows: the lubricating oil stored in the oil chamber at the bottom of the housing body is filtered by a filter, pumped out by an oil pump, enters an oil-water heat exchanger and is cooled by the cooling water, and is then transported to the motor and the shaft gear assembly, and then returns to the oil chamber to form a lubricating oil circulation.

[0026] Based on the same inventive concept, this application also provides a vehicle including the above-described electric drive system.

[0027] As can be seen from the above technical solution, the housing assembly provided in this application is applied to a dual-motor electric drive system or an electric drive system with more motors. The housing assembly includes two housing units: a main housing and an upper housing. The main housing is used to accommodate each motor and some necessary accessories, such as the pump. The main housing is provided with a flow channel for coolant flow; that is, the main housing of this application also functions as a water-cooling plate. The upper housing is disposed on the main housing, and the upper housing and the main housing together form a control cavity for accommodating the control components, thereby separating the motor and the control components and avoiding electromagnetic interference. The flow channel of the main housing has an open structure, with the opening of the flow channel facing the control cavity. When the control components are installed in the control cavity, the control components cover the opening of the flow channel to form a cooling channel, allowing the control components to directly contact the coolant in the cooling channel, thus achieving effective cooling of the control components. The housing assembly provided in this application deeply integrates the housing of the motor and its control components, and integrates the controller cooling components and the outer shell into the housing assembly, reducing the overall volume for easier installation, while also reducing the number of controller cooling components and lowering costs. Attached Figure Description

[0028] Figure 1 This is a full cross-sectional view of the electric drive system in the embodiments of this application.

[0029] Figure 2 for Figure 1 AA cross-section view.

[0030] Figure 3 for Figure 2 A schematic diagram of the control cavity in an electric drive system.

[0031] Figure 4 This is a structural block diagram of the cooling cycle system of the electric drive system in the embodiments of this application.

[0032] Explanation of reference signs: 1000-electric drive system.

[0033] 100-housing assembly, 101-motor cavity, 102-control cavity, 103-axle tooth cavity; 110-housing main body, 111-right housing, 112-left housing, 113-rear end cover, 114-flowing groove, 115-radiating boss of the flowing groove, 116-sealing groove, 117-cooling flow channel; 120-upper housing.

[0034] 200-motor; 210-generator; 220-driving motor.

[0035] 300-control assembly; 310-control board; 320-IGBT module, 321-IGBT, 3211-mounting edge, 3212-through hole, 3213-radiating boss of the IGBT, 322-driving board; 330-capacitor; 340-current sensor; 350-bracket, 351-mounting plate, 352-leg; 360-shielding plate.

[0036] 400-axle tooth assembly.

[0037] 10-sealing ring; 20-seal, 30-connecting pipe, 40-inlet pipe, 50-outlet pipe.

[0038] 1-water tank; 2-fan; 3-water pump; 4-oil-water heat exchanger; 5-oil cavity; 6-filter; 7-oil pump. DETAILED DESCRIPTION

[0039] In order to make the skilled in the art to which the present application belongs more clearly understand the present application, the following specific embodiments combined with the drawings, the technical solutions of the present application are described in detail.

[0040] Example 1:

[0041] The present embodiment provides a housing assembly 100 applied to an electric drive system 1000, the electric drive system 1000 is configured with two or more motors 200 and corresponding control assemblies 300, the electric drive system 1000 can be a pure electric electric drive system 1000 or a hybrid electric drive system 1000. Referring to Figures 1 to 2 , the housing assembly 100 includes two housing units of a housing main body 110 and an upper housing 120, wherein the housing main body 110 is used to accommodate each motor 200 and the installation of some necessary accessories such as pumps, temperature sensors, etc., the housing main body 110 is provided with a motor cavity 101, and each motor 200 is installed in the motor cavity 101; the upper housing 120 is arranged on the housing main body 110, and the upper housing 120 and the housing main body 110 jointly form a control cavity 102 for accommodating the control assembly 300, thereby realizing the separation of the motor 200 and the control assembly 300 and avoiding electromagnetic interference.

[0042] The shell body 110 can be produced by processes such as gravity casting, high-pressure casting, etc., and can be made of aluminum alloy, cast iron, etc. Generally, the electric drive system 1000 is vertically installed in the vehicle, i.e., the shell body 110 is below the upper shell 120. In this embodiment, the top of the shell body 110 is provided with a flow-through groove 114 for the flow of cooling liquid. That is, the top of the shell body 110 simultaneously functions as a water cooling plate. The flow-through groove 114 of the shell body 110 is of an open structure, and the groove opening of the flow-through groove 114 faces the control cavity 102. When the control assembly 300 is installed in the control cavity 102, the control assembly 300 covers the groove opening of the flow-through groove 114 to enclose a cooling flow channel 117, and the control assembly 300 can directly contact the cooling liquid (such as cooling water) in the cooling flow channel 117, thereby achieving effective cooling of the control assembly 300.

[0043] The control assembly 300 contains an IGBT module 320. Generally, one motor 200 is configured with one IGBT module 320, and the IGBT module 320 in the control assembly 300 is the main heat-generating component, and thus the cooling of the control assembly 300 is mainly for the cooling of the IGBT module 320. The shell assembly 100 according to the present application is applied to an electric drive system 1000 configured with two or more motors 200, and thus the shell assembly 100 needs to meet the cooling requirements of two or more IGBT modules 320.

[0044] Specifically referring to Figure 2 and Figure 3 In some embodiments, the number of flow-through grooves 114 is the same as the number of motors 200, and the flow-through grooves 114 are downward recessed on the top surface of the shell body 110. For convenience of arrangement, the flow-through grooves 114 are uniformly distributed in the horizontal direction. Two adjacent flow-through grooves 114 are connected by a connecting pipe 30. The connecting pipe 30 is a separate part and can be a conventional pipe such as an injection molded part or a metal elbow pipe, and the material is not limited. The connecting pipe 30 is used to connect the flow-through grooves 114, so that the shell body 110 avoids the internal chamber structure that cannot be molded, and the overall production process cost and difficulty are reduced.

[0045] To ensure the sealing performance, the two ends of the connecting pipe 30 are sealed by a sealing ring 10. The inner ring of the sealing ring 10 tightly wraps around the pipe opening of the connecting pipe 30, and the outer ring of the sealing ring 10 tightly contacts the groove wall of the flow-through groove 114 and the outer wall of the IGBT module 320. In some embodiments, referring to Figure 3Holes 3212 are formed on the IGBT module 320, and the end of the connecting pipe 30 is inserted into the holes 3212 and sealed by the sealing ring 10. The flow channels 114 are sequentially connected by the connecting pipe 30. The inlet pipe 40 and the outlet pipe 50 are arranged on the shell body 110 and connected to the first and last flow channels 114, respectively. The inlet pipe 40 and the outlet pipe 50 can be independent pipe fittings assembled on the shell body 110 or welded or bonded to the shell body 110, and the corresponding mounting holes are machined on the shell body 110. The inlet pipe 40 and the outlet pipe 50 can also be integrally formed with the shell body 110, which is not limited in the present application.

[0046] In other embodiments, the flow channel 114 can also be a full-length channel, and two or more open cooling sites are formed by welding or bonding a sealing plate on the channel opening. Since the welding of aluminum alloy is high in cost and relatively difficult, the process complexity is increased. Therefore, when the full-length flow channel 114 is used, the material of the shell body 110 is preferably cast iron.

[0047] In the shell assembly 100 of the present application, based on the above structure of the shell body 110, the connection between the adjacent two flow channels 114 is realized by the connecting pipe 30 or a full-length flow channel 114 is directly arranged, so that each IGBT module 320 can be installed on the top surface of the shell body 110 from top to bottom. The shell body 110 does not have any internal cavity (closed hole, such as a horizontal through hole connecting two channels), so the shell body 110 can be molded as a whole in the casting process along the direction indicated by the arrow a. In this way, high-pressure casting with high productivity (which cannot be used to cast internal cavities) can be used, and the sand casting gravity casting process (which has low production efficiency and high cost) for realizing internal cavities is avoided. Figure 3

[0048] Please refer to Figure 3 In some embodiments, the inner wall of the flow channel 114 is provided with heat dissipation bosses 115 distributed at intervals. The shape of the heat dissipation boss 115 is not limited, such as a cylindrical boss, a cubic boss, a hemispherical boss, a needle-shaped boss, etc. The protruding height of the heat dissipation boss 115 is less than the groove depth of the flow channel 114, so as to avoid affecting the installation of the IGBT module 320. By arranging the heat dissipation boss 115, the contact area between the cooling liquid and the shell body 110 is further increased, and the cooling effect is improved.

[0049] In order to facilitate the installation of the motor 200, the shell body 110 adopts a split structure. In some embodiments, the shell assembly 100 is applied to a pure electric motor drive system 1000, and the specific structure can be referred to Figure 2 ​The shell body 110 comprises a first shell and a second shell, the interface between the first shell and the second shell is a horizontal plane or a vertical plane, the first shell and the second shell are fixed by bolts and sealed by a sealing ring 10. The top of the first shell or the second shell is provided with a flow channel 114, and the flow channel 114 and the upper shell 120 jointly form a control cavity 102 for accommodating a control assembly 300. The upper shell 120 can be provided as a cover plate or a cover body with a cavity according to actual needs.

[0050] In some other embodiments, the shell assembly 100 is applied to a hybrid electric drive system 1000. Referring to Figure 1 The shell body 110 comprises a right shell 111, a left shell 112 and a rear end cover 113 connected in sequence, the right shell 111 and the left shell 112 jointly form a shaft tooth cavity 103 for accommodating a shaft tooth assembly 400 of the hybrid electric drive system 1000, and the left shell 112 and the rear end cover 113 jointly form a motor cavity 101 for accommodating a motor 200. At least one of the right shell 111, the left shell 112 and the rear end cover 113 jointly form the control cavity 102 with the upper shell 120. Since the left shell 112 is located between the right shell 111 and the rear end cover 113 and has a relatively large volume, in order to facilitate the arrangement of the upper shell 120, in some embodiments, the left shell 112 jointly forms the control cavity 102 with the upper shell 120. The left side surface, the right side surface and the top surface of the left shell 112 are all provided with cavities for mounting the motor 200, the shaft tooth assembly 400 and the control assembly 300. The motor cavity 101 is located closer to the control cavity 102 than the shaft tooth cavity 103, which facilitates the electrical connection between the three-phase copper bars of the IGBT module 320 and the three-phase copper bars of the motor 200.

[0051] Therefore, the shell assembly 100 of the embodiment deeply integrates the shell of the motor 200, the control assembly 300 and the shaft tooth assembly 400, and integrates the controller cooling assembly and the shell in the shell assembly 100, thereby reducing the two large-size parts, i.e., the controller lower shell and the bottom shell in the prior art, improving the integration level and reducing the volume of the assembly for facilitating the mounting. Meanwhile, the shell assembly 100 of the embodiment reduces the controller cooling component (water cooling plate) and reduces the cost. In addition, the shell body 110 of the embodiment is not designed with any internal cavity, and therefore the shell body 110 can be manufactured by high-pressure casting with high productivity, which is suitable for mass production.

[0052] Embodiment 2:

[0053] Based on the same inventive concept, the embodiment provides an electric drive system 1000 configured with the shell assembly 100 of the above-mentioned embodiment 1, and therefore the detailed structure of the shell assembly 100 can be referred to the embodiment 1, which will not be described herein again. Referring to Figure 1 and Figure 2The electric drive system 1000 is provided with two or more electric machines 200 and corresponding control assemblies 300, each electric machine 200 is arranged in the motor cavity 101 of the shell assembly 100, and the control assembly 300 is arranged in the control cavity 102 of the shell assembly 100. The control assembly 300 covers the slot of the flow-through groove 114 to form a closed cooling flow channel 117 together with the flow-through groove 114. In order to improve the sealing performance, the control assembly 300 and the shell body 110 are provided with a sealing element 20.

[0054] Specifically, in some embodiments, the control assembly 300 includes a control board 310 and an IGBT module 320 corresponding to the number of electric machines 200, the IGBT module 320 includes an IGBT 321 and a drive board 322 electrically connected, and the control board 310 and the drive board 322 are both PCB boards and are fixed by screws. The IGBT 321 covers the slot of the flow-through groove 114, and the IGBT 321 has a mounting edge 3211 extending horizontally outward, and the mounting edge 3211 is provided with a through hole 3212 for mounting the connecting pipe 30, as shown in Figure 3 The shell body 110 or the mounting edge 3211 is provided with a sealing groove 116 for limiting the sealing element 20.

[0055] Referring to Figure 3 In some embodiments, in order to improve the heat dissipation effect, the surface of the IGBT 321 facing the slot is provided with heat dissipation bosses 3213 distributed at intervals, and the heat dissipation bosses 3213 are not limited in shape, such as cylindrical bosses, cubic bosses, hemispherical bosses, needle-shaped bosses, etc. By providing heat dissipation bosses 3213 on the IGBT 321, the contact area between the cooling liquid and the IGBT 321 is further increased, and the heat dissipation effect is improved. The protruding height of the heat dissipation boss 3213 is less than the groove depth of the flow-through groove 114, so as to avoid affecting the installation of the IGBT module 320. When the inner wall of the flow-through groove 114 is also provided with heat dissipation bosses 115, the heat dissipation bosses 3213 of the IGBT 321 and the heat dissipation bosses 115 of the flow-through groove 114 should be distributed in different positions. If the heat dissipation bosses 3213 of the IGBT 321 and the heat dissipation bosses 115 of the flow-through groove 114 are opposite to each other, the sum of the protruding heights of the upper and lower heat dissipation bosses should be less than the distance between the bottom surface of the IGBT 321 and the groove bottom of the flow-through groove 114, so as to ensure the smooth flow of the cooling liquid.

[0056] Referring to Figure 1In some embodiments, the control assembly 300 further comprises a capacitor 330 and a current sensor 340, and the IGBT module 320, the capacitor 330 and the current sensor 340 are electrically connected with the control board 310. Specifically, the control board 310 is connected to the upper shell 120, and the IGBT module 320, the capacitor 330 and the current sensor 340 are all connected to the shell body 110. The control board 310, the IGBT module 320, the capacitor 330 and the current sensor 340 can be fixed and installed first and then wired. In order to reduce the overall size of the controller, the capacitor 330 and the current sensor 340 are distributed side by side with the IGBT module 320, that is, the capacitor 330 and the current sensor 340 are located on the side of the IGBT module 320, fully utilizing the horizontal space and reducing the vertical height of the controller.

[0057] Referring to Figure 3 In some embodiments, the control assembly 300 further comprises a bracket 350 and a shielding plate 360, the bracket 350 is connected to the upper shell 120, and the control board 310 and the shielding plate 360 are both installed on the bracket 350, and the shielding plate 360 is located between the control board 310 and the IGBT module 320. Specifically, the bracket 350 has a mounting plate 351 and a leg 352, the leg 352 is connected to the upper shell 120 by screws, the control board 310 is installed on the upper surface of the mounting plate 351, and the shielding plate 360 is installed on the lower surface of the mounting plate 351, which plays a role in resisting electromagnetic interference.

[0058] In some embodiments, the electric drive system 1000 is a pure electric drive system 1000. Taking a double-motor 200 pure electric drive system 1000 as an example, the specific structure can be referred to Figure 2 The two motors 200 are arranged side by side in the motor cavity 101, and the arrangement direction is the same as that of the flow channel 114.

[0059] In some embodiments, the electric drive system 1000 is a hybrid electric drive system 1000. Taking a double-motor 200 hybrid electric drive system 1000 as an example, the specific structure can be referred to Figure 1 The two motors 200 of the hybrid electric drive system 1000 are a generator 210 and a drive motor 220, and the generator 210 and the drive motor 220 are in transmission connection with the shaft tooth assembly 400 of the hybrid electric drive system 1000. The specific structure of the shaft tooth assembly 400 is not limited in the present application, for example, the shaft tooth structure in the invention application "A hybrid power drive system" with publication number CN113232501A can be used.

[0060] The hybrid electric drive system 1000 comprises a cooling circulation system for cooling the control assembly 300 and the motor 200, and lubricating the bearing of the motor 200 and the shaft tooth assembly 400. For details, please refer to Figure 4The cooling circulation system includes a cooling water circulation subsystem for cooling the control assembly 300 and a lubricating oil circulation subsystem for cooling and / or lubricating the motor 200 and the shaft tooth assembly 400. The cooling water circulation subsystem is in communication with the engine cooling water system of the vehicle, and the cooling water circulation is formed by using the water tank 1, the water pump 3, the cooling device (e.g. fan, radiator) and the like of the engine cooling water system. The lubricating oil circulation subsystem is an independent circulation subsystem, and is internally provided with an oil pump, a filter and the like.

[0061] Specifically referring to Figure 3 and Figure 4 , the cooling water circulation of the cooling water circulation subsystem is configured as follows: the cooling water is water from the water tank 1 of the vehicle, is cooled by the front fan 2 of the vehicle, is pumped by the water pump 3 to the inlet pipe 40, flows into the cooling flow channel 117 to cool the control assembly 300, and is discharged from the outlet pipe 50 (as shown by the direction of arrow b in Figure 3 , is cooled by the oil-water heat exchanger 4, and is returned to the water tank 1, thereby forming the cooling water circulation. The cooling water passing through the oil-water heat exchanger 4 will take away part of the heat of the lubricating oil in the oil-water heat exchanger 4, thereby indirectly cooling the motor 200.

[0062] The lubricating oil circulation of the lubricating oil circulation subsystem is configured as follows: the lubricating oil is stored in the oil cavity 5 at the bottom of the housing main body 110, is filtered by the filter 6, is pressurized by the oil pump 7, is cooled by the cooling water in the oil-water heat exchanger 4, and is then delivered to the motor 200 and the shaft tooth assembly 400 to cool the stator of the motor 200 and the meshing positions of the gears, lubricate the bearings and the meshing positions of the gears, and flow out of the shaft tooth assembly 400 and then return to the oil cavity 5, thereby forming the lubricating oil circulation.

[0063] Embodiment 3:

[0064] Based on the same inventive concept, the application further provides a vehicle comprising the electric drive system 1000 of the above embodiment 2. The vehicle can be a pure electric vehicle or a hybrid vehicle. Since the vehicle adopts all the technical solutions of the electric drive system 1000 of the above embodiment 2, it at least has all the beneficial effects brought by the technical solutions of the above embodiment 2, which will not be repeated here.

[0065] Although the preferred embodiments of the application have been described, those skilled in the art who have the basic inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the application.

[0066] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A housing assembly applied to an electric drive system provided with two or more electric machines and corresponding control components, characterized in that: The shell assembly comprises: a shell body provided with motor cavities for accommodating the two or more motors and flow-through grooves for the flow of cooling liquid; an upper shell arranged on the shell body and enclosing a control cavity for accommodating a control assembly of the electric drive system with the shell body, the grooves being communicated with the control cavity; wherein the shell body is located below the upper shell, the top of the shell body is provided with the flow-through grooves, the top of the shell body simultaneously serves as a water-cooling plate, the flow-through grooves are formed by downwardly recessing the top surface of the shell body, the flow-through grooves are of an open structure, the grooves of the flow-through grooves face the control cavity, the number of the flow-through grooves is the same as that of the motors, adjacent two flow-through grooves are communicated through connecting pipes, when the control assembly is installed in the control cavity, the control assembly covers the grooves of the flow-through grooves to enclose cooling flow channels, the control assembly is directly contacted with the cooling liquid in the cooling flow channels, thereby achieving the cooling of the control assembly.

2. The housing assembly of claim 1, wherein: The shell body is provided with an inlet pipe and an outlet pipe communicated with the flow-through grooves.

3. The housing assembly of claim 2, wherein: The inner wall of the flow-through grooves is provided with heat dissipation bosses distributed at intervals.

4. The housing assembly of claim 2, wherein: The shell body is formed by high-pressure casting.

5. The housing assembly of any one of claims 1-4, wherein: The shell assembly is applied to a hybrid electric drive system, the shell body comprises a right shell, a left shell and a rear end cover connected in sequence, the right shell and the left shell enclose a shaft tooth cavity for accommodating a shaft tooth assembly of the hybrid electric drive system, and the left shell and the rear end cover enclose the motor cavities. At least one of the right shell, the left shell and the rear end cover encloses the control cavity with the upper shell.

6. The housing assembly of claim 5, wherein: The left shell encloses the control cavity with the upper shell.

7. An electric drive system characterized by, The shell assembly comprises: the shell assembly of any one of claims 1-6; two or more motors arranged in the motor cavities of the shell assembly; a control assembly arranged in the control cavity of the shell assembly and covering the grooves of the flow-through grooves to enclose cooling flow channels with the flow-through grooves.

8. The electric drive system of claim 7, wherein: The control assembly comprises a control board and IGBT modules the same in number as the motors, IGBTs of the IGBT modules covering the grooves of the flow-through grooves.

9. The electric drive system of claim 8, wherein: The surface of the IGBTs facing the grooves is provided with heat dissipation bosses distributed at intervals.

10. The electric drive system of claim 8, wherein: The control assembly further comprises a capacitor and a current sensor, the capacitor and the current sensor being distributed side by side with the IGBT modules.

11. The electric drive system of claim 8, wherein: The control assembly further comprises a bracket and a shielding plate, the bracket being connected to the upper shell, the control board and the shielding plate being mounted on the bracket, and the shielding plate being located between the control board and the IGBT modules.

12. An electric drive system according to any one of claims 7-11, characterized in that: The electric drive system is a hybrid electric drive system, the motors of the hybrid electric drive system are provided with two, i.e. a generator and a drive motor, and the generator and the drive motor are both drivingly connected with a shaft tooth assembly of the hybrid electric drive system.

13. The electric drive system of claim 12, wherein: The hybrid electric drive system comprises a cooling circulation system; the cooling circulation system comprises a cooling water circulation subsystem for cooling the control assembly, and a lubricating oil circulation subsystem for cooling and / or lubricating the motor and the shaft tooth assembly.

14. The electric drive system of claim 13, wherein: The cooling water circulation of the cooling water circulation subsystem is configured such that water in a water tank is cooled by a cooling device and then enters the cooling flow channel to cool the control assembly, and the cooling water discharged from the cooling flow channel is returned to the water tank through an oil-water heat exchanger, thereby forming a cooling water circulation; The lubricating oil circulation of the lubricating oil circulation subsystem is configured such that lubricating oil stored in an oil cavity at the bottom of the shell body is filtered by a filter, pressurized by an oil pump, and then enters the oil-water heat exchanger to be cooled by the cooling water, and then is transported to the motor and the shaft tooth assembly, and then is returned to the oil cavity, thereby forming a lubricating oil circulation.

15. A vehicle characterized by: An electric drive system comprising any one of claims 7-14.

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