CN115642742A - Casing assembly, electric drive system and vehicle - Google Patents

Abstract

The application discloses casing assembly, electric drive system and vehicle solves current motor controller's of adorning outward electric drive system bulky, is unfavorable for the technical problem that whole car carried. The shell assembly comprises a shell body and an upper shell, wherein the shell body is provided with a motor cavity for accommodating a motor and a circulation groove for circulating cooling liquid, the upper shell is arranged on the shell body, and the upper shell and the shell body surround a control cavity for accommodating the control assembly. The circulation groove of casing main part is open structure, and the notch of circulation groove is towards the control chamber, and the control assembly can direct and the coolant liquid direct contact in the cooling runner, effective cooling. The application provides a casing assembly degree of depth has integrated motor and control assembly's casing to with controller cooling module and shell integration in casing assembly, reduce the assembly volume and do benefit to the carry-on, reduce controller cooling part simultaneously, reduce cost.

Description

Casing assembly, electric drive system and vehicle

Technical Field

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

The motor controller of the electric drive system, especially the IGBT inside the motor controller, generates heat greatly, and is not beneficial to the service life of the motor controller. Therefore, a special water cooling plate is arranged in the controller to cool the IGBT, and cooling water circulation is carried out through an external pipeline.

In an existing electric drive system, a motor controller is installed on an assembly as an independent module, and cooling liquid circulation is performed through an external pipeline to cool an IGBT. The external motor controller makes the whole electric drive system large and is not beneficial to being carried on the whole vehicle.

Disclosure of Invention

In order to solve the technical problem, the application provides a casing assembly, an electric drive system and a vehicle, which adopt an integral casing, and integrate a controller cooling component and a shell in the casing assembly of the electric drive system so as to reduce the volume of the assembly.

Realize that the technical scheme that this application purpose adopted does, a casing assembly is applied to the electric drive system who is provided with two above motors, casing assembly includes:

the shell body is provided with a motor cavity for accommodating the more than two motors and a circulating groove for circulating cooling liquid;

the upper shell is arranged on the shell body and surrounds a control cavity used for containing a control assembly of the electric drive system with the shell body, and a notch of the circulation groove is communicated with the control cavity.

In some embodiments, the number of the circulation grooves is the same as that of the motors, and two adjacent circulation grooves are communicated through a connecting pipe; the shell body is provided with an inlet pipe and an outlet pipe which are communicated with the circulation groove.

In some embodiments, the inner wall of the circulation groove is provided with heat dissipation bosses distributed at intervals.

In some embodiments, the housing body is formed by high pressure casting.

In some embodiments, the housing assembly is applied to a hybrid electric drive system; the shell body comprises a right shell, a left shell and a rear end cover which are sequentially connected, the right shell and the left shell are encircled to form an axle tooth cavity for containing an axle tooth of the hybrid power electric drive system, and the left shell and the rear end cover are encircled to form the motor cavity;

at least one of the right shell, the left shell and the rear end cover and the upper shell enclose the control cavity.

In some embodiments, the left housing and the upper housing enclose the control chamber.

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

the above-described housing assembly;

the more than two motors are arranged in a motor cavity of the shell assembly;

and the control component is arranged in the control cavity of the shell assembly and covers the notch of the circulation groove to form a cooling flow passage together with the circulation groove.

In some embodiments, the control assembly comprises a control board and the same number of IGBT modules as the motors, and the IGBTs of the IGBT modules cover the notches of the circulation grooves.

In some embodiments, the surface of the IGBT facing the notch is provided with spaced heat dissipation bosses.

In some embodiments, the control assembly further comprises a capacitance and a current sensor, both of which are distributed alongside the IGBT module.

In some embodiments, the control assembly further comprises a bracket and a shield plate, the bracket is connected to the upper housing, the control board and the shield plate are both mounted on the bracket, and the shield plate is located between the control board and the IGBT module.

In some embodiments, the electric drive system is a hybrid electric drive system; the hybrid electric drive system is characterized in that the number of the motors of the hybrid electric drive system is two, the two motors are respectively a generator and a driving motor, and the generator and the driving motor are in transmission connection with shaft teeth of the hybrid electric drive system.

In some embodiments, the hybrid electric drive system includes a cooling cycle 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 teeth.

In some embodiments, the cooling water circulation of the cooling water circulation subsystem is configured to: the water in the 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 by the cooling flow channel returns to the water tank after passing through the oil-water heat exchanger to form cooling water circulation;

the lubricating oil circulation of the lubricating oil circulation subsystem is set as follows: and after being filtered by a filter and pumped out by an oil pump under pressure, the lubricating oil stored in the oil cavity at the bottom of the shell body enters an oil-water heat exchanger to be cooled by the cooling water, is then conveyed to the motor and the shaft tooth assembly, and then returns to the oil cavity to form lubricating oil circulation.

Based on the same inventive concept, the application also provides a vehicle comprising the electric drive system.

According to the technical scheme, the shell assembly provided by the application is applied to a double-motor electric drive system or an electric drive system provided with more motors, and comprises a shell main body and an upper shell, wherein the shell main body is used for accommodating each motor and installing necessary accessories such as a pump, and the shell main body is provided with a circulating groove for circulating cooling liquid, namely, the shell main body simultaneously serves as a water cooling plate. Go up the casing and set up on casing main part, go up the casing and surround with casing main part and be used for holding control assembly's control chamber, realize motor and control assembly's separation from this, avoid producing electromagnetic interference. The circulation groove of casing main part is open structure, and the notch of circulation groove is towards the control chamber, and when control assembly installed in the control chamber, control assembly covers in the notch of circulation groove in order to surround into the cooling runner, and control assembly can be direct and the coolant liquid direct contact in the cooling runner to the realization is to control assembly's effective cooling. The application provides a casing assembly degree of depth has integrated motor and control assembly's casing to with controller cooling module and shell integration in casing assembly, reduce the assembly volume and do benefit to the carry-on, reduce controller cooling part simultaneously, reduce cost.

Drawings

FIG. 1 is a full sectional view of an electric drive system in an embodiment of the present application.

Fig. 2 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 1.

FIG. 3 is a schematic diagram of a control chamber in the electric drive system of FIG. 2.

Fig. 4 is a block diagram of a cooling cycle system of an electric drive system according to an embodiment of the present application.

Description of the reference numerals: 1000-electric drive system.

100-a shell assembly, 101-a motor cavity, 102-a control cavity and 103-an axial tooth cavity; 110-shell body, 111-right shell, 112-left shell, 113-rear end cover, 114-circulation groove, 115-heat dissipation boss of circulation groove, 116-sealing groove, 117-cooling runner; 120-upper shell.

200-a motor; 210-a generator; 220-drive motor.

300-a control component; 310-a control panel; 320-IGBT module, 321-IGBT, 3211-mounting edge, 3212-through hole, 3213-heat dissipation boss of IGBT, 322-drive plate; 330-capacitance; 340-a current sensor; 350-bracket, 351-mounting plate and 352-support leg; 360-shield plate.

400-axial teeth.

10-a sealing ring; 20-seal, 30-connecting tube, 40-inlet tube, 50-outlet tube.

1-a water tank; 2-a fan; 3-a water pump; 4-oil-water heat exchanger; 5-an oil chamber; 6-a filter; 7-oil pump.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

Example 1:

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, and the electric drive system 1000 may be a pure electric drive system 1000 or a hybrid electric drive system 1000. Referring specifically to fig. 1 to 2, the housing assembly 100 includes two housing units, namely a housing main body 110 and an upper housing 120, wherein the housing main body 110 is used for accommodating each motor 200 and installing necessary accessories such as a pump, a temperature sensor and the like, 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 casing 120 is disposed on the casing main body 110, and the control cavity 102 for accommodating the control component 300 is surrounded by the upper casing 120 and the casing main body 110, so as to separate the motor 200 and the control component 300 and avoid generating electromagnetic interference.

The housing body 110 may be produced by a process such as gravity casting or high-pressure casting, and the material thereof may be selected from aluminum alloy, cast iron, and the like. Generally, electric drive system 1000 is mounted vertically in the vehicle, i.e., housing body 110 is located below upper housing 120. In this embodiment, a circulation groove 114 is formed at the top of the case body 110 to allow the cooling fluid to circulate therethrough. That is, the top of the housing body 110 also acts as a water-cooling plate. The flow groove 114 of the housing body 110 is an open structure, the notch of the flow groove 114 faces the control chamber 102, when the control component 300 is installed in the control chamber 102, the control component 300 covers the notch of the flow groove 114 to enclose the cooling flow passage 117, and the control component 300 can directly contact with the cooling liquid (e.g., cooling water) in the cooling flow passage 117, so as to achieve effective cooling of the control component 300.

The control unit 300 includes the IGBT module 320, and normally, one IGBT module 320 is disposed for one motor 200, and since the IGBT module 320 in the control unit 300 is a main heat generating member and generates a large amount of heat, the cooling of the control unit 300 is mainly performed for the IGBT module 320. The housing assembly 100 according to the present application is applied to the electric drive system 1000 configured with two or more electric machines 200, and therefore the housing assembly 100 needs to satisfy the cooling requirements of two or more IGBT modules 320.

Referring specifically to fig. 2 and 3, in some embodiments, the number of the circulation grooves 114 is the same as that of the motor 200, and the circulation grooves 114 are formed by recessing the top surface of the housing body 110 downward, and the circulation grooves 114 are uniformly distributed in a horizontal direction for the convenience of arrangement. The two adjacent circulation grooves 114 are communicated through the connecting pipe 30, the connecting pipe 30 is an independent part, conventional pipe fittings such as injection molding parts or metal bent pipes can be adopted, the material is not limited, the connecting pipe 30 is adopted to communicate with the circulation grooves 114, the internal cavity structure which cannot be demoulded is avoided on the shell body 110, and the overall production process cost and difficulty are reduced.

In order to ensure the sealing performance, two ends of the connecting pipe 30 are sealed by the sealing ring 10, the inner ring of the sealing ring 10 is tightly wrapped at the pipe orifice of the connecting pipe 30, and the outer ring of the sealing ring 10 is tightly contacted with the groove wall of the circulation groove 114 and the outer wall of the IGBT module 320. In some embodiments, referring to fig. 3, the igbt module 320 is provided with a through hole 3212, and the end of the connection pipe 30 is inserted into the through hole 3212 and sealed by the sealing ring 10. The respective circulation grooves 114 are sequentially communicated by the connection pipe 30. The casing body 110 is provided with an inlet pipe 40 and an outlet pipe 50, and the inlet pipe 40 and the outlet pipe 50 are respectively communicated with the head and the tail circulation grooves 114. The inlet pipe 40 and the outlet pipe 50 may be separate pipes assembled on the housing body 110, or welded or adhered to the housing body 110, and corresponding mounting holes are machined on the housing body 110; the inlet pipe 40 and the outlet pipe 50 may be integrally formed with the housing body 110, and the present application is not limited thereto.

In other embodiments, the flow channel 114 may be a through slot, with two or more open cooling sites formed by welding or bonding cover plates to the slot. Because aluminum alloy welding is costly, difficult and complicated, the material of the casing body 110 is preferably cast iron when the through-long circulation groove 114 is used.

In the case assembly 100 of the present application, based on the above structure of the case body 110, the communication between two adjacent circulation grooves 114 is realized by the connection pipe 30 or one through long circulation groove 114 is directly provided, so that each IGBT module 320 can be mounted on the top surface of the case body 110 from top to bottom. The casing body 110 does not have any internal cavity (closed hole, for example, a horizontal through hole communicating two grooves), so that the casing body 110 can be integrally demolded and formed in the casting process along the direction indicated by the arrow a in fig. 3, high-pressure casting with high productivity (the internal cavity cannot be cast) can be used, and the falling sand gravity casting process (low production efficiency and high cost) for realizing the internal cavity is avoided.

Referring to fig. 3, in some embodiments, the inner wall of the circulation groove 114 is provided with heat dissipation bosses 115 distributed at intervals, and the shapes of the heat dissipation bosses 115 are not limited, such as cylindrical bosses, cubic bosses, hemispherical bosses, needle-shaped bosses, and the like. The protruding height of the heat dissipation boss 115 is smaller than the depth of the circulation groove 114, so as to avoid affecting the installation of the IGBT module 320. The cooling effect is improved by further increasing the contact area between the cooling liquid and the housing main body 110 through the heat dissipation boss 115.

In order to facilitate the installation of the motor 200, the housing body 110 adopts a split structure. In some embodiments, the housing assembly 100 is applied to a purely electric drive system 1000, and the specific structure can refer to fig. 2. The housing body 110 includes a first housing and a second housing, the interface of the first housing and the second housing is a horizontal plane or a vertical plane, the first housing and the second housing are fixed by bolts, and a sealing ring 10 is arranged between the first housing and the second housing for sealing. The first or second housing is provided with a flow-through channel 114 at the top and encloses a control chamber 102 with an upper housing 120 for receiving a control assembly 300. The upper housing 120 may be configured as a cover plate or a housing with a cavity as required.

In other embodiments, the housing assembly 100 is used in a hybrid electric drive system 1000. Referring to fig. 1, the housing main body 110 includes a right housing 111, a left housing 112, and a rear end cover 113 connected in sequence, the right housing 111 and the left housing 112 enclose an axle tooth cavity 103 for accommodating an axle tooth assembly 400 of the hybrid electric drive system 1000, and the left housing 112 and the rear end cover 113 enclose a motor cavity 101 for accommodating the motor 200. At least one of the right housing 111, the left housing 112, and the rear cover 113 encloses the upper housing 120 to form the control chamber 102. Since the left housing 112 is located between the right housing 111 and the rear end cap 113, the volume is relatively large, and the upper housing 120 is convenient to arrange, in some embodiments, the left housing 112 and the upper housing 120 enclose the control chamber 102. The left side, right side and top of the left housing 112 each have a cavity for the motor 200, the shaft tooth assembly 400 and the control assembly 300 to be mounted. The position of motor chamber 101 is more close to control chamber 102 than axle tooth chamber 103, and the three-phase copper bar of the IGBT module 320 of being convenient for is connected with the three-phase copper bar electricity of motor 200.

Therefore, the casing assembly 100 of the embodiment deeply integrates the motor 200, the control component 300 thereof and the casing formed by the shaft teeth 400, and integrates the controller cooling component and the casing in the casing assembly 100, so that two parts with larger sizes, namely the lower casing and the bottom casing of the controller in the prior art, are reduced, the integration level is higher, and the assembly volume is reduced to facilitate carrying. Meanwhile, the housing assembly 100 of the present embodiment reduces the controller cooling components (water cooling plates) and reduces the cost. In addition, the housing main body 110 of the present embodiment does not have any internal cavity designed therein, so the housing main body 110 can be cast using high pressure with high productivity, and is suitable for mass production.

Example 2:

based on the same inventive concept, the present embodiment provides an electric drive system 1000, and the electric drive system 1000 is configured with the housing assembly 100 of embodiment 1, so the detailed structure of the housing assembly 100 can refer to embodiment 1, and is not described herein again. Referring to fig. 1 and 2, the electric drive system 1000 is provided with two or more motors 200 and corresponding control components 300, each motor 200 is disposed in a motor cavity 101 of the housing assembly 100, and the control components 300 are disposed in a control cavity 102 of the housing assembly 100. The control assembly 300 covers the mouth of the flow-through channel 114 to enclose a closed cooling flow channel 117 with the flow-through channel 114. To improve sealing performance, a sealing member 20 is provided between the control assembly 300 and the housing body 110.

Specifically, in some embodiments, the control assembly 300 includes a control board 310 and IGBT modules 320, the number of which is the same as that of the motors 200, the IGBT modules 320 include electrically connected IGBTs 321 and drive boards 322, and the control board 310 and the drive boards 322 are both PCB boards and are fixed by screws. The IGBT321 covers the notch of the circulation groove 114, the IGBT321 has an installation edge 3211 extending horizontally outward, a through hole 3212 for installing the connection pipe 30 is provided on the installation edge 3211, and as shown in fig. 3, a sealing groove 116 for limiting the sealing member 20 is provided on the housing main body 110 or the installation edge 3211.

Referring to fig. 3, in some embodiments, in order to improve the heat dissipation effect, the surface of the IGBT321 facing the slot is provided with heat dissipation bosses 3213 distributed at intervals, and the shape of the heat dissipation bosses 3213 is not limited, for example, cylindrical bosses, cubic bosses, hemispherical bosses, needle-shaped bosses, and the like. The contact area between the coolant and the IGBT321 is further increased by providing the heat dissipation boss 3213 on the IGBT321, thereby improving the heat dissipation effect. The protruding height of the heat dissipation boss 3213 is smaller than the depth of the circulation groove 114, so as to avoid affecting the installation of the IGBT module 320. When the inner wall of the circulation groove 114 is also provided with the heat dissipation bosses 115, the heat dissipation bosses 3213 of the IGBT321 and the heat dissipation bosses 115 of the circulation groove 114 should be distributed in a staggered manner. If the heat dissipation bosses 3213 of the IGBT321 are opposite to the heat dissipation bosses 115 of the circulation groove 114, the sum of the heights of the upper and lower heat dissipation bosses should be smaller than the distance between the bottom surface of the IGBT321 and the bottom of the circulation groove 114, so as to ensure smooth circulation of the coolant.

Referring to fig. 1, in some embodiments, the control assembly 300 further includes a capacitor 330 and a current sensor 340, and the igbt module 320, the capacitor 330, and the current sensor 340 are all electrically connected to the control board 310. Specifically, the control board 310 is connected to the upper housing 120, and the IGBT module 320, the capacitor 330, and the current sensor 340 are all connected to the housing body 110, and the control board 310, the IGBT module 320, the capacitor 330, and the current sensor 340 may be fixed and then wired. In order to reduce the overall size of the controller, the capacitor 330 and the current sensor 340 are both distributed side by side with the IGBT module 320, that is, the capacitor 330 and the current sensor 340 are both located on the side of the IGBT module 320, so that the lateral space is fully utilized, and the longitudinal height of the controller is reduced.

Referring to fig. 3, in some embodiments, the control assembly 300 further includes a bracket 350 and a shield plate 360, the bracket 350 is connected to the upper housing 120, the control board 310 and the shield plate 360 are both mounted on the bracket 350, and the shield 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 supporting leg 352, the supporting leg 352 is connected to the upper housing 120 by a screw, the control board 310 is mounted on the upper surface of the mounting plate 351, and the shielding plate 360 is mounted on the lower surface of the mounting plate 351 to play a role of anti-electromagnetic interference.

In some embodiments, the electric drive system 1000 is a pure-electric-drive system 1000, taking the pure-electric-drive system 1000 of the dual-motor 200 as an example, and the specific structure can refer to fig. 2. Two motors 200 are arranged side by side in the motor chamber 101 and in the same direction as the flow channels 114.

In some embodiments, the electric drive system 1000 is a hybrid electric drive system 1000, and the specific structure of the hybrid electric drive system 1000 with two motors 200 can refer to fig. 1. The two motors 200 of the hybrid electric drive system 1000 are the generator 210 and the driving motor 220, respectively, the generator 210 and the driving motor 220 are both in transmission connection with the shaft gear assembly 400 of the hybrid electric drive system 1000, and the specific structure of the shaft gear assembly 400 is not limited in the present application, for example, the shaft gear structure in the invention application "a hybrid drive system" with the publication number of CN113232501a can be adopted.

The hybrid electric drive system 1000 includes a cooling circulation system for cooling the control assembly 300, the motor 200, and lubricating the bearings and the shaft-tooth assembly 400 of the motor 200. Referring specifically to fig. 4, the cooling circulation system includes a cooling water circulation subsystem for cooling the control assembly 300 and a lubrication oil circulation subsystem for cooling and/or lubricating the motor 200 and the shaft tooth assembly 400. Wherein the cooling water circulation subsystem is communicated with an engine cooling water system of the vehicle, and forms cooling water circulation by utilizing a water tank 1, a water pump 3, a cooling device (such as a fan, a radiator) and the like of the engine cooling water system. The lubricating oil circulation subsystem is an independent circulation subsystem, and an oil pump, a filter and the like are arranged in the lubricating oil circulation subsystem.

Referring specifically to fig. 3 and 4, the cooling water circulation of the cooling water circulation subsystem is set as: the cooling water is pumped from the water tank 1 of the vehicle to the inlet pipe 40 by the water pump 3 after being cooled by the fan 2 at the front of the vehicle, flows into the cooling flow passage 117 to cool the control assembly 300, is discharged from the outlet pipe 50 (as shown by arrow b in fig. 3), passes through the oil-water heat exchanger 4, and returns to the water tank 1, thereby forming a cooling water circulation. The cooling water passing through the oil-water heat exchanger 4 takes away a part of heat of the lubricating oil in the oil-water heat exchanger 4, thereby indirectly cooling the motor 200.

The lubricating oil circulation of the lubricating oil circulation subsystem is set as follows: lubricating oil is stored in an oil cavity 5 at the bottom of the shell body 110, the lubricating oil is filtered by a filter 6, is pressurized and pumped by an oil pump 7, enters the oil-water heat exchanger 4, is cooled by cooling water, is conveyed to the motor 200 and the shaft tooth assembly 400 to cool the meshing part of the stator and each gear of the motor 200, lubricates each bearing and each gear meshing part, flows out of the shaft tooth assembly 400, and then returns to the oil cavity 5 to form lubricating oil circulation.

Example 3:

based on the same inventive concept, the present application also provides a vehicle including the electric drive system 1000 of embodiment 2 described above. The vehicle may 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, at least all the beneficial effects brought by the technical solutions of the above embodiment 2 are achieved, and no further description is given here.

While the preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (15)

1. The utility model provides a shell assembly, is applied to the electric drive system who is provided with two above motors which characterized in that: the housing assembly includes:

the shell body is provided with a motor cavity for accommodating the more than two motors and a circulating groove for circulating cooling liquid;

the upper shell is arranged on the shell body and surrounds a control cavity for containing a control assembly of the electric drive system with the shell body, and a notch of the circulation groove is communicated with the control cavity.

2. The housing assembly of claim 1, wherein: the number of the circulation grooves is the same as that of the motors, and two adjacent circulation grooves are communicated through a connecting pipe; the shell body is provided with an inlet pipe and an outlet pipe which are communicated with the circulation groove.

3. The housing assembly of claim 2, wherein: the inner wall of the circulation groove is provided with heat dissipation bosses which are distributed at intervals.

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

5. The housing assembly of any 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 which are sequentially connected, the right shell and the left shell are encircled to form an axle tooth cavity for containing an axle tooth of the hybrid power electric drive system, and the left shell and the rear end cover are encircled to form the motor cavity;

at least one of the right shell, the left shell and the rear end cover and the upper shell enclose the control cavity.

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

7. An electric drive system, comprising:

the housing assembly of any one of claims 1-6;

the more than two motors are arranged in a motor cavity of the shell assembly;

and the control component is arranged in the control cavity of the shell assembly and covers the notch of the circulation groove to form a cooling flow passage together with the circulation groove.

8. The electric drive system of claim 7, wherein: the control assembly comprises a control board and IGBT modules with the same number as the motors, and the IGBTs of the IGBT modules cover the notches of the circulation grooves.

9. The electric drive system of claim 8, wherein: radiating bosses distributed at intervals are arranged on the surface of the IGBT facing the notch.

10. The electric drive system of claim 8, wherein: the control assembly further comprises a capacitor and a current sensor, and the capacitor and the current sensor are distributed with the IGBT module in parallel.

11. The electric drive system of claim 8, wherein: the control assembly further comprises a support and a shielding plate, the support is connected to the upper shell, the control plate and the shielding plate are mounted on the support, and the shielding plate is located between the control plate and the IGBT module.

12. The electric drive system of any of claims 7-11, wherein: the electric drive system is a hybrid power electric drive system; the hybrid electric drive system is characterized in that the number of the motors of the hybrid electric drive system is two, the two motors are respectively a generator and a driving motor, and the generator and the driving motor are in transmission connection with shaft teeth of the hybrid electric drive system.

13. The electric drive system of claim 12, wherein: the hybrid electric drive system includes 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 teeth.

14. The electric drive system of claim 13, wherein: the cooling water circulation of the cooling water circulation subsystem is set as follows: the water in the water tank is cooled by the cooling device and then enters the cooling flow channel to cool the control assembly, and the cooling water discharged by the cooling flow channel returns to the water tank after passing through the oil-water heat exchanger to form cooling water circulation;

the lubricating oil circulation of the lubricating oil circulation subsystem is set as follows: and after being filtered by a filter and pumped out by an oil pump under pressure, the lubricating oil stored in the oil cavity at the bottom of the shell body enters an oil-water heat exchanger to be cooled by the cooling water, is then conveyed to the motor and the shaft tooth assembly, and then returns to the oil cavity to form lubricating oil circulation.

15. A vehicle, characterized in that: comprising an electric drive system according to any of claims 7-14.

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