Electric drive system

Abstract

The utility model provides an electric drive system. The electric drive system comprises a first shell, a motor assembly and a controller. The first shell is provided with an inner cavity; the motor assembly and the controller are both arranged in the inner cavity, and the controller is located on one side of the motor assembly. The motor assembly comprises a stator and rotor module and a cooling sleeve, the periphery of the stator and rotor module is sleeved with the cooling sleeve, and at least one part of structure of a second refrigerant flow channel is formed on the cooling sleeve; the controller comprises a functional structure and a refrigerant carrier, the refrigerant carrier is provided with a first refrigerant flow channel, and the first refrigerant flow channel is at least partially located on the side, facing the motor assembly, of the functional structure; the inlet end of the first refrigerant flow channel and the outlet end of the second refrigerant flow channel are communicated with the outside of the first shell, and the first refrigerant flow channel is further communicated with the second refrigerant flow channel. According to the electric drive system, the motor assembly and the controller are integrated into a whole, the refrigerant flow channels of the motor assembly and the controller communicate with each other to conduct refrigerant circulation together, the integration degree of the electric drive system is improved, and meanwhile the structure of the refrigerant flow channels is simplified.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and specifically relates to an electric drive system. Background Art

[0002] The existing three-in-one electric drive system includes a power electronic controller (PEU), an electric motor (EM), and a gearbox (GB). These components are split structures, in which both the PEU and the EM are cooled by water. That is, the PEU has an independent shell and cooling water channel, and the EM also has an independent shell and cooling water channel. The cooling water channel of the PEU and the cooling water channel of the EM both circulate cooling water independently. This results in a low degree of integration of the electric drive system and a complex cooling water flow channel. Utility Model Content

[0003] The utility model aims to provide an electric drive system with a high degree of integration.

[0004] To achieve the above object, the utility model provides an electric drive system, comprising:

[0005] A first shell having an inner cavity;

[0006] a motor assembly, disposed in the inner cavity, and comprising a stator-rotor module and a cooling jacket, wherein the cooling jacket is disposed on the outer periphery of the stator-rotor module, and at least a part of the structure of the second refrigerant flow channel is formed on the cooling jacket; and,

[0007] A controller is arranged in the inner cavity and located on one side of the motor assembly; the controller comprises a functional structure and a refrigerant carrier, the refrigerant carrier is provided with a first refrigerant flow channel, and the first refrigerant flow channel is at least partially located on a side of the functional structure facing the motor assembly;

[0008] The inlet end of the first refrigerant flow channel and the outlet end of the second refrigerant flow channel are both connected to the outside of the first shell, and the first refrigerant flow channel is also connected to the second refrigerant flow channel.

[0009] Optionally, the inner cavity comprises a first sub-chamber and a second sub-chamber separated from each other; the first sub-chamber is connected to the second sub-chamber at a predetermined position;

[0010] The controller is arranged in the first sub-chamber, and the motor assembly is arranged in the second sub-chamber; a groove is formed on the outer peripheral surface of the cooling sleeve, and the groove cooperates with the inner wall of the second sub-chamber to form the second refrigerant flow channel; the inlet end of the second refrigerant flow channel is connected with the outlet end of the first refrigerant flow channel at the predetermined position.

[0011] Optionally, the outer peripheral surface of the cooling sleeve includes a first area, a second area and a third area arranged in sequence along its axial direction, and the groove is formed on the second area; the axial ends of the cooling sleeve, the first area, and the third area are all connected to the shell.

[0012] Optionally, the groove is a spiral structure extending spirally around the axis of the motor assembly, and the groove includes a plurality of spiral turns connected in sequence; a portion of the second region located between two adjacent spiral turns is connected to the housing.

[0013] Optionally, at least one ridge is provided in each of the spiral turns, and each of the ridges extends along the circumference of the motor assembly.

[0014] Optionally, two axial ends of the cooling jacket are welded to the shell, and the first region and the third region are interference fit with the shell.

[0015] Optionally, the controller includes a charging and distribution unit and an inverter; the charging and distribution unit includes an on-board charger module, a DC / DC converter module and a second shell; the second shell wraps the on-board charger module and the DC / DC converter module; a first sub-refrigerant flow channel is provided on the second shell, the first sub-refrigerant flow channel is at least arranged on the side of the second shell located on the on-board charger module and the DC / DC converter module close to the motor assembly, and the inlet end of the first sub-refrigerant flow channel is connected to the outside of the first shell; the inverter includes an inverter module and a water-cooling plate, the water-cooling plate is arranged on the side of the inverter module close to the motor assembly, and a second sub-refrigerant flow channel is provided on the water-cooling plate, the inlet end of the second sub-refrigerant flow channel is connected to the outlet end of the first sub-refrigerant flow channel, and the outlet end of the second sub-refrigerant flow channel is connected to the inlet end of the second refrigerant flow channel;

[0016] The functional structure includes the on-board charger module, the DC / DC converter module and the inverter module; the refrigerant carrier includes at least a partial structure of the second shell and the water-cooling plate; the first refrigerant flow channel includes the first sub-refrigerant flow channel and the second sub-refrigerant flow channel.

[0017] Optionally, the first sub-chamber and the second sub-chamber are arranged along a first direction; the charging and distribution unit and the inverter are arranged along a second direction; the motor assembly is arranged corresponding to the charging and distribution unit, and the axis of the motor assembly extends along a third direction; the third direction, the second direction and the first direction are perpendicular to each other.

[0018] Optionally, the charging and distribution unit and the inverter are arranged along a second direction, and the controller further includes a high-voltage distribution box, which is located on one side of the inverter and arranged with the inverter along a third direction, wherein the third direction is perpendicular to the second direction.

[0019] Optionally, the electric drive system further includes a reduction gearbox, which is at least partially disposed in the inner cavity and is drivingly connected to an output shaft of the motor assembly.

[0020] Compared with the prior art, the electric drive system of the utility model has the following advantages:

[0021] The aforementioned electric drive system includes a first shell, a motor assembly and a controller; the first shell is a hollow structure with an inner cavity; the motor assembly and the controller are both arranged in the inner cavity, and the controller is located on one side of the motor assembly; the motor assembly includes a stator and rotor module and a cooling jacket, the cooling jacket is arranged on the outer periphery of the stator and rotor module, and at least a part of the structure of the second refrigerant flow channel is formed on the cooling jacket; the controller includes a functional structure and a second shell that wraps the functional structure, and the second shell is located on the side of the functional structure facing the motor assembly and is provided with a first refrigerant flow channel; the inlet end of the first refrigerant flow channel and the outlet end of the second refrigerant flow channel are evenly connected to the outside of the first shell, and the first refrigerant flow channel is also interconnected with the second refrigerant flow channel. That is, the electric drive system integrates the motor assembly and the controller into one, and makes the refrigerant flow channels of the two interconnected to circulate the refrigerant together, which improves the integration of the electric drive system while simplifying the structure of the refrigerant flow channel.

[0022] Furthermore, the controller includes a charging and distribution unit and an inverter; the charging and distribution unit includes an on-board charger module, a DC / DC converter module and a second shell, the second shell wraps the on-board charger module and the DC / DC converter module; a first sub-refrigerant flow channel is provided on the second shell, the first sub-refrigerant flow channel is at least arranged on the side of the second shell located at the on-board charger module and the DC / DC converter module close to the motor assembly, and the inlet end of the first sub-refrigerant flow channel is connected to the outside of the first shell; the inverter includes an inverter module and a water-cooled The water-cooled plate is arranged on the side of the inverter module close to the motor assembly, and a second sub-refrigerant flow channel is arranged on the water-cooled plate, the inlet end of the second sub-refrigerant flow channel is connected with the outlet end of the first sub-refrigerant flow channel, and the outlet end of the second sub-refrigerant flow channel is connected with the inlet end of the second refrigerant flow channel; the functional structure includes the on-board charger module, the DC / DC converter module and the inverter module, and the refrigerant carrier includes at least part of the structure of the second shell and the water-cooled plate; the first refrigerant flow channel includes the first sub-refrigerant flow channel and the second sub-refrigerant flow channel. The controller integrates the inverter module, the on-board charger module and the DC / DC converter module, further improving the integration of the electric drive system, and when cooling the controller, the refrigerant first dissipates heat to the charging and distribution unit with a larger heat dissipation, and then dissipates heat to the inverter module with a smaller heat dissipation, which can effectively dissipate heat to the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 1 is a schematic diagram of the structure of an electric drive system provided by the utility model according to an embodiment, in which part of the structure of the first housing is removed to show the controller;

[0025] Figure 2 1 is a schematic diagram of the structure of an electric drive system provided by the utility model according to an embodiment, in which part of the structure of the first housing and the controller are removed to show the motor assembly;

[0026] Figure 3 The utility model is a schematic structural diagram of a cooling jacket of an electric drive system provided according to an embodiment.

[0027] [Description of reference numerals is as follows]:

[0028] 100-first shell, 210-cooling jacket, 211-first area, 212-second area, 213-third area, 201-inlet end of the second refrigerant flow channel, 202-outlet end of the second refrigerant flow channel, 203-groove, 204-ridge, 300-controller, 310-charging and distribution unit, 320-inverter, 330-high-voltage distribution box, 301-inlet end of the first refrigerant flow channel, 302-outlet end of the first refrigerant flow channel, 303-outlet end of the first sub-refrigerant flow channel, 304-inlet end of the second sub-refrigerant flow channel, 401-inlet end of the refrigerant inlet pipe. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0030] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise of being possible to implement, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0031] As used in this specification, the singular forms "one", "an", and "the" include plural objects, and the plural form "a plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be a connection between two elements or an interactive relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The utility model aims to provide an electric drive system, which has the advantages of high integration, compact structure and simple refrigerant flow channel structure.

[0033] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0034] Figure 1 and Figure 2 FIG. 1 is a schematic diagram showing the structure of an electric drive system provided by an embodiment of the present utility model. Figure 1 and Figure 2As shown, the electric drive system includes a first shell 100, a motor assembly (not marked in the figure) and a controller 300. Among them, the first shell 100 is a hollow structure with an inner cavity. The motor assembly and the controller 300 are both arranged in the inner cavity, and the controller 300 is located on one side of the motor assembly. The motor assembly includes a stator and rotor module (not shown in the figure) and a cooling jacket 210, the cooling jacket 210 is sleeved on the outer periphery of the stator and rotor module, and the cooling jacket 210 is formed with at least a part of the structure of the second refrigerant flow channel (not marked in the figure). The controller 300 includes a functional structure (not shown in the figure) and a refrigerant carrier (not marked in the figure). The refrigerant carrier is provided with a first refrigerant flow channel (not shown in the figure), and the first refrigerant flow channel is at least partially located on the side of the functional structure facing the motor assembly. The first refrigerant flow channel has an inlet end 301 and an outlet end 302, and the second refrigerant flow channel has an inlet end 201 and an outlet end 202. The inlet end 301 of the first refrigerant flow channel and the outlet end 202 of the second refrigerant flow channel are both connected to the outside of the first shell 100, and the outlet end 302 of the first refrigerant flow channel is connected to the inlet end 201 of the second refrigerant flow channel, so that the first refrigerant flow channel and the second refrigerant flow channel form a series structure. Figure 2 In the embodiment, the outlet end 302 of the first refrigerant flow channel coincides with the inlet end 201 of the second refrigerant flow channel.

[0035] That is, the electric drive system integrates the controller 300 and the motor assembly into the inner cavity of the first shell 100, rather than including a split controller and motor assembly, to achieve the effect of improving the integration of the electric drive system. Moreover, after the first refrigerant flow channel and the second refrigerant flow channel are designed as a series structure, the refrigerant in the first refrigerant flow channel and the second refrigerant flow channel can be circulated at the same time, without the need to circulate the refrigerant for dissipating heat for the controller and the refrigerant for dissipating heat for the motor assembly, respectively, thereby simplifying the structure of the refrigerant flow channel. In an embodiment of the utility model, the refrigerant includes but is not limited to water. In practice, a refrigerant inflow pipe is provided on the first shell 100, the inlet end 401 of the refrigerant inflow pipe extends to the outside of the first shell 100, the outlet end of the refrigerant inflow pipe extends to the inner cavity, and is connected to the inlet end 301 of the first refrigerant flow channel, so that the inlet end 301 of the first refrigerant flow channel is connected to the outside of the first shell 100 through the refrigerant inflow pipe.

[0036] Next, the detailed configuration of each component of the electric drive system and the relative position relationship and connection relationship between each component are further explained.

[0037] The inner cavity of the first housing 100 includes a first sub-chamber (not labeled in the figure) and a second sub-chamber (not labeled in the figure) separated from each other. The first sub-chamber and the second sub-chamber are arranged along a first direction (eg Figure 1 and Figure 2 In an optional embodiment, please combine Figure 1 and Figure 2 , the first direction is a vertical direction, that is, the first sub-chamber and the second sub-chamber are arranged along the vertical direction, and the first sub-chamber can be located above the second sub-chamber. The first sub-chamber is used to accommodate the controller 300, and the second sub-chamber is used to accommodate the motor assembly, so that the controller 300 is located above the motor assembly. The first sub-chamber and the second sub-chamber are also connected at a predetermined position, so that the outlet end 302 of the first refrigerant channel and the inlet end 201 of the second refrigerant channel can be connected at the predetermined position.

[0038] Please focus on Figure 1 , the controller 300 includes a charging and distribution unit 310 and an inverter 320. The charging and distribution unit 310 includes an on-board charger module (not shown in the figure), a DC / DC converter module (not shown in the figure) and a second shell (not marked in the figure), and the second shell wraps the on-board charger module and the DC / DC converter module. The inverter 320 includes an inverter module (not shown in the figure) and a water-cooling plate (not marked in the figure), and the water-cooling plate is arranged on a side of the inverter module close to the motor assembly. In practice, the inverter also includes a capacitor, which is located on a side of the inverter module close to the motor assembly, and the water-cooling plate is arranged between the inverter module and the capacitor.

[0039] The aforementioned functional structure includes the on-board charger module, the DC / DC converter module and the inverter module. The second housing includes at least a part of the structure of the second housing and the water cooling plate.

[0040] The second shell is provided with a first sub-refrigerant flow channel, and the first sub-refrigerant flow channel is at least arranged on the side of the second shell located at the on-board charger module and the DC / DC converter module facing the motor assembly. The water-cooled plate is provided with a second sub-refrigerant flow channel. Moreover, the inlet end of the first sub-refrigerant flow channel is connected to the outside of the first shell 100, the outlet end 303 of the first sub-refrigerant flow channel is connected to the inlet end 304 of the second sub-refrigerant flow channel, and the outlet end of the second sub-refrigerant flow channel is connected to the inlet end 201 of the second refrigerant flow channel at the predetermined position. In other words, the first refrigerant flow channel includes the first sub-refrigerant flow channel and the second sub-refrigerant flow channel, and the inlet end of the first sub-refrigerant flow channel is the inlet end 301 of the first refrigerant flow channel, and the outlet end of the second sub-refrigerant flow channel is the outlet end 302 of the first refrigerant flow channel.

[0041] In other words, the electric drive system integrates the on-board charger module, the DC / DC converter module and the inverter module at the same time, and has a higher degree of integration and compactness. The arrangement of the first refrigerant flow channel can effectively dissipate heat for the charging and distribution unit 310 with a larger heat dissipation and the inverter 320 with a smaller heat dissipation, thereby ensuring the heat dissipation effect.

[0042] It should be noted that the charging and distribution unit 310 is a prior art, and the detailed configurations of the on-board charger module, the DC / DC converter module, the second housing, and the first sub-refrigerant flow channel on the second housing are all well known in the art and are not further described here. The inverter 320 is also a prior art, and the detailed configurations of the inverter module, the capacitor, the water-cooling plate, and the second sub-refrigerant flow channel on the water-cooling plate are all well known in the art and are not further described here.

[0043] Optionally, the charging and distributing unit 310 and the inverter 320 are arranged in the first chamber along the second direction. Figure 1 In the second direction (at Figure 1 and Figure 2 The controller 300 further includes a high-voltage distribution box 330, which is located on one side of the inverter 320, and the high-voltage distribution box 330 and the inverter 320 are connected along a third direction (in Figure 1 and Figure 2 The third direction is a horizontal direction perpendicular to the second direction.

[0044] Please refer to Figure 2, the second sub-chamber is located below the charging and distribution unit 310. The second sub-chamber may be a cylindrical structure, and the axis of the second sub-chamber extends along the third direction. When the motor assembly is accommodated in the second sub-chamber, the motor assembly is arranged corresponding to the charging and distribution unit 310. The advantage of doing this is that the height of the electric drive system can be reduced (i.e., the size of the electric drive system in the first direction is reduced). Alternatively, the second sub-chamber may also be located below the inverter 320, but this may cause the height of the electric drive system to increase.

[0045] Those skilled in the art know that the stator-rotor module includes a stator and a rotor. The embodiment of the utility model has no special restrictions on the relative position relationship between the stator and the rotor. In some embodiments, the stator is sleeved on the outer periphery of the rotor, and in other embodiments, the rotor is sleeved on the outer periphery of the stator.

[0046] The structure of the cooling jacket 210 is as follows Figure 3 As shown, it is a hollow cylindrical structure. A groove 203 is formed on the outer circumferential surface of the cooling sleeve 210, and the cooling sleeve 210 is connected with the inner wall of the second sub-chamber so that the groove 203 and the inner wall of the second sub-chamber together enclose to form the second refrigerant flow channel. Such a configuration can effectively simplify the molding method of the second refrigerant flow channel.

[0047] For details, please continue to refer to Figure 3 The cooling jacket 210 includes a first region 211, a second region 212 and a third region 213 arranged in sequence along its axial direction. The groove 203 is formed on the second region 212. The first region 211, the second region 213 and both axial ends of the cooling jacket 210 are connected to the inner wall of the second sub-chamber.

[0048] Preferably, please continue to refer to Figure 3 , the groove 203 is a spiral structure that spirally extends around the axis of the motor assembly. Thus, the groove 203 includes a plurality of spiral turns. In this way, the second refrigerant flow channel is a spiral structure. The second refrigerant flow channel with a spiral structure can increase the time of indirect contact between the refrigerant and the stator and rotor modules, and improve the cooling effect on the stator and rotor assembly. In addition, the form of the second refrigerant flow channel is also conducive to maintaining the pressure drop of the refrigerant in the second refrigerant flow channel.

[0049] The portion of the second region 212 located between two adjacent spiral turns is also connected to the shell. The embodiment of the utility model does not limit the specific connection method between the axial ends of the cooling sleeve 210, the first region 211, the portion of the second region 212 located between two adjacent spiral turns, and the third region 213 and the inner wall of the second sub-chamber, as long as these parts are connected to the inner wall of the second sub-chamber, and the second refrigerant flow channel is sealed at the connection so that the refrigerant will not leak. In a preferred implementation, the axial ends of the cooling sleeve 210 are welded to the inner wall of the second sub-chamber, and the optional welding method includes but is not limited to stir friction welding, and the first region 211, the third region 213, and the portion of the second region 212 located between two adjacent spiral turns are all interference fit with the inner wall of the first sub-chamber. Such a connection method can achieve the sealing between the cooling sleeve 210 and the inner wall of the second sub-chamber without using a sealing ring, effectively reducing production costs.

[0050] For further information, please refer to Figure 3 , at least one ridge 204 is also provided in each spiral turn of the groove 203, and the ridge 204 extends along the circumference of the motor assembly. The provision of the ridge 204 increases the contact area between the cooling sleeve 210 and the refrigerant, thereby increasing the heat dissipation area of ​​the cooling sleeve 210 and improving the heat dissipation effect. At the same time, the presence of the ridge 204 is also conducive to maintaining the pressure drop of the refrigerant in the second refrigerant flow channel. In practice, two ridges 204 can be provided in each spiral turn, and the two ridges 204 in the same spiral turn are arranged at intervals along the axial direction of the motor assembly.

[0051] In addition, the electric drive system further includes a reduction gearbox (not shown in the figure), which is at least partially disposed in the inner cavity of the first housing 100 and is drivingly connected to the output shaft of the motor assembly.

[0052] Although the utility model is disclosed as above, it is not limited thereto. Those skilled in the art may make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. An electric drive system, characterized in that: include: A first shell having an inner cavity; a motor assembly, disposed in the inner cavity, and comprising a stator-rotor module and a cooling jacket, wherein the cooling jacket is disposed on the outer periphery of the stator-rotor module, and at least a part of the structure of the second refrigerant flow channel is formed on the cooling jacket; and, A controller is arranged in the inner cavity and located on one side of the motor assembly; the controller comprises a functional structure and a refrigerant carrier, the refrigerant carrier is provided with a first refrigerant flow channel, and the first refrigerant flow channel is at least partially located on a side of the functional structure facing the motor assembly; The inlet end of the first refrigerant flow channel and the outlet end of the second refrigerant flow channel are both connected to the outside of the first shell, and the first refrigerant flow channel is also connected to the second refrigerant flow channel.

2. The electric drive system according to claim 1, characterized in that: The inner cavity comprises a first sub-chamber and a second sub-chamber separated from each other; the first sub-chamber is connected to the second sub-chamber at a predetermined position; The controller is arranged in the first sub-chamber, and the motor assembly is arranged in the second sub-chamber; a groove is formed on the outer peripheral surface of the cooling sleeve, and the groove cooperates with the inner wall of the second sub-chamber to form the second refrigerant flow channel; the inlet end of the second refrigerant flow channel is connected with the outlet end of the first refrigerant flow channel at the predetermined position.

3. The electric drive system according to claim 2, characterized in that: The outer peripheral surface of the cooling jacket comprises a first area, a second area and a third area arranged in sequence along its axial direction, and the groove is formed on the second area; both axial ends of the cooling jacket, the first area, and the third area are connected to the shell.

4. The electric drive system according to claim 3, characterized in that: The groove is a spiral structure that spirally extends around the axis of the motor component, and the groove includes a plurality of spiral turns that are connected in sequence; a portion of the second region located between two adjacent spiral turns is connected to the housing.

5. The electric drive system according to claim 4, characterized in that: At least one ridge is arranged in each of the spiral turns, and each of the ridges extends along the circumference of the motor assembly.

6. The electric drive system according to claim 3, characterized in that: The two axial ends of the cooling jacket are welded to the shell, and the first region and the third region are interference fit with the shell.

7. The electric drive system according to claim 2, characterized in that: The controller includes a charging and distribution unit and an inverter; the charging and distribution unit includes an on-board charger module, a DC / DC converter module and a second shell; the second shell wraps the on-board charger module and the DC / DC converter module; a first sub-refrigerant flow channel is provided on the second shell, the first sub-refrigerant flow channel is at least arranged on the side of the second shell located at the on-board charger module and the DC / DC converter module close to the motor assembly, and the inlet end of the first sub-refrigerant flow channel is connected to the outside of the first shell; the inverter includes an inverter module and a water-cooling plate, the water-cooling plate is arranged on the side of the inverter module close to the motor assembly, a second sub-refrigerant flow channel is provided on the water-cooling plate, the inlet end of the second sub-refrigerant flow channel is connected to the outlet end of the first sub-refrigerant flow channel, and the outlet end of the second sub-refrigerant flow channel is connected to the inlet end of the second refrigerant flow channel; The functional structure includes the on-board charger module, the DC / DC converter module and the inverter module; the refrigerant carrier includes at least a partial structure of the second shell and the water-cooling plate; the first refrigerant flow channel includes the first sub-refrigerant flow channel and the second sub-refrigerant flow channel.

8. The electric drive system according to claim 7, characterized in that: The first sub-chamber and the second sub-chamber are arranged along a first direction; the charging and distribution unit and the inverter are arranged along a second direction; the motor assembly is arranged corresponding to the charging and distribution unit, and the axis of the motor assembly extends along a third direction; the third direction, the second direction and the first direction are perpendicular to each other.

9. The electric drive system according to claim 7, characterized in that: The charging and distribution unit and the inverter are arranged along a second direction, and the controller further includes a high-voltage distribution box, which is located on one side of the inverter and arranged with the inverter along a third direction, wherein the third direction is perpendicular to the second direction.

10. The electric drive system according to claim 1, characterized in that: The electric drive system also includes a reduction gearbox, which is at least partially disposed in the inner cavity and is drivingly connected to the output shaft of the motor assembly.

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