Powertrain and mechanical equipment

Abstract

The present application provides a powertrain and mechanical equipment, which includes a heat exchanger, an electronic component and a motor. The electronic component includes a first shell, the motor includes a second shell, the first shell and the second shell are fixedly connected, and the heat exchanger is also fixed to the first shell, so that the heat exchanger, the electronic component and the electronic component are fixed to the motor as a whole. The electronic component includes an electronic device, which is arranged in the accommodating cavity of the first shell. The heat exchanger includes a first flow channel, which is used to transmit a cooling medium. The electronic component includes a second flow channel, which passes through the accommodating cavity of the first shell, and the second flow channel is connected to the first flow channel. The motor includes a third flow channel, which passes through the accommodating cavity of the second shell, and the third flow channel is connected to the first flow channel. Thus, the unified cooling medium can dissipate heat for the motor and the electronic component. This solution can improve the integration of the powertrain and improve the heat dissipation effect of the powertrain.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to a powertrain and mechanical equipment. Background Art

[0002] With the development of electric vehicles, the demand for miniaturization of their powertrains is increasing. At present, electric vehicles also include electronic components, such as microcontroller units (MCU) and on-board chargers (OBC). In order to reduce the structural volume, the powertrain in the prior art may include the above-mentioned electronic components in addition to the motor. The power density of the motor in the powertrain needs to be increased from the current 5.7kW / L to 50kW / L. As the power density increases, the heat generated by the motor also gradually increases, and the electronic components are usually provided with heating devices. Therefore, the powertrain usually has a cooling system to dissipate heat from various parts of the powertrain.

[0003] Figure 1 FIG. 1 is a schematic diagram of a cooling medium flow of a powertrain in the prior art, such as Figure 1 As shown, in the prior art, the power assembly includes an electronic component 2, a motor 3 and a reducer 4. In addition, the power assembly is also connected to a heat exchanger 1, in which an external coolant and a cooling medium flow. The motor 3 is cooled by the cooling medium, and the electronic component 2 is cooled by the external coolant. The external coolant generally uses non-insulated 50% ethylene glycol. The external coolant can only indirectly cool the electronic component 2, that is, the external coolant flows through the radiator 27 that fits the electronic device 26 to cool the electronic device 26. The sealing requirements of the radiator 27 are very strict, otherwise it will cause leakage of the external coolant and there is a risk of short circuit. In addition, the electronic component 2 and the heat exchanger 1 need to be connected outside the assembly using a water pipe, and the flow resistance of the water pipe is required to be high. This requires that when arranging the power assembly, the position of the connection port where the electronic component 2 is connected to the heat exchanger 1 must be fully considered to reserve space for arranging the external water pipe, to ensure that the water pipe is easy to arrange and will not wear on the shell surface, which often limits the overall structure and affects the integration. In addition, the arrangement of the water pipe and the radiator 27 in the electronic component 2 also needs to consider the volume and avoid the internal components. Therefore, it is difficult to improve the heat dissipation capacity and heat dissipation efficiency of the electronic component 2. Summary of the invention

[0004] The present application provides a powertrain and mechanical equipment to improve the integration of the powertrain and improve the heat dissipation effect of the powertrain.

[0005] In a first aspect, the present application provides a powertrain, which includes a heat exchanger, an electronic component and a motor. Specifically, the electronic component includes a first housing, the motor includes a second housing, the first housing and the second housing are fixedly connected, and the heat exchanger is also fixed to the first housing, so that the heat exchanger, the electronic component and the electronic component are fixed as one. The electronic component includes an electronic device, which is specifically arranged in the accommodating cavity of the first housing, and the electronic device may specifically include a heating device. The heat exchanger includes a first flow channel. The first flow channel is used to transmit a cooling medium. The cooling medium can specifically dissipate heat for the powertrain. The electronic component includes a second flow channel, the second flow channel passes through the accommodating cavity of the first housing, and the second flow channel is connected to the first flow channel. Thus, the cooling medium can flow to the accommodating cavity of the first housing through the second flow channel to dissipate heat for the electronic device in the electronic component. The motor includes a third flow channel, the third flow channel passes through the accommodating cavity of the second housing, and the third flow channel is connected to the first flow channel. Thus, the cooling medium can flow through the third flow channel to the accommodating cavity of the second shell to dissipate heat for the stator and rotor in the motor. In the embodiment of the present application, the refrigerant for dissipating heat for the electronic components and the motor comes from the first flow channel, so that the same cooling medium can be used to dissipate heat for the electronic components and the motor, which is beneficial to improve the integration of the powertrain and reduce the volume of the powertrain. In addition, the cooling medium is usually insulating cooling oil. Therefore, when the cooling medium is used to dissipate heat for the electronic components, there is no risk of short circuit. In addition, it is also beneficial to improve the heat dissipation effect of the electronic components, improve the heat dissipation capacity and heat dissipation efficiency of the electronic components, and improve the heat dissipation effect of the powertrain.

[0006] The first flow channel of the above-mentioned heat exchanger can dissipate heat naturally or by means of a fan, so as to cool down the cooling medium. Alternatively, in another technical solution, the heat exchanger further includes a fourth flow channel, which is used to transmit an external coolant, and a heat exchange wall is provided between the first flow channel and the fourth flow channel. The cooling medium in the first flow channel and the external coolant in the fourth flow channel are heat-exchanged through the heat exchange wall, and the external coolant is used to dissipate heat for the cooling medium, so that the cooling medium can be recycled. This solution is conducive to improving the heat exchange capacity of the heat exchanger, and thus improving the heat dissipation capacity of the powertrain. Improve the working efficiency of the powertrain.

[0007] The power assembly may further include a reducer, the reducer including a third housing, the third housing being fixedly arranged with the second housing, so that the reducer and the motor are fixedly arranged. The reducer includes a fifth flow channel, the fifth flow channel passes through the accommodating chamber of the third housing, and the fifth flow channel is connected with the first flow channel. Thus, the cooling medium can flow to the accommodating chamber of the third housing through the fifth flow channel to dissipate heat and provide lubrication for the rotating parts in the reducer.

[0008] In a technical solution, the electronic component includes a first sub-section and a second sub-section, the first housing includes a first accommodating chamber and a second accommodating chamber, the first sub-section is arranged in the first accommodating chamber, the second sub-section is arranged in the second accommodating chamber, and the second flow channel is arranged in the first accommodating chamber. In this solution, the cooling medium of the second flow channel can be used to dissipate heat for the first sub-section. In other words, part of the structure of the electronic component can be made to dissipate heat using the cooling medium. Specifically, the heat generated by the first sub-section is relatively large, and this solution is conducive to improving the heat dissipation effect of the first sub-section.

[0009] In another technical solution, the second accommodating cavity includes a sixth flow channel, which is connected to the fourth flow channel. In other words, the external coolant can flow through the second sub-section through the sixth flow channel, thereby using the external coolant to dissipate heat for the second sub-section.

[0010] In addition, when the electronic component includes a first sub-section and a second sub-section, the first housing includes a first accommodating chamber and a second accommodating chamber, the first sub-section is arranged in the first accommodating chamber, the second sub-section is arranged in the second accommodating chamber, the second flow channel is arranged in the first accommodating chamber, and the second accommodating chamber includes a sixth flow channel, which is connected to the first flow channel. In this solution, the cooling medium can be used to dissipate heat from the entire structure of the powertrain, so as to improve the integration of the powertrain and reduce the volume of the powertrain.

[0011] When the above-mentioned heat exchanger is specifically set, the specific structure of the above-mentioned heat exchanger is not limited. In a technical solution, the above-mentioned first flow channel includes a first sub-flow channel and a second sub-flow channel. The above-mentioned heat exchange wall includes a first heat exchange wall and a second heat exchange wall, the first heat exchange wall is located between the first sub-flow channel and the fourth flow channel, and the second heat exchange wall is located between the second sub-flow channel and the fourth flow channel. In a specific technical solution, the first sub-flow channel and the second sub-flow channel can be located on both sides of the fourth flow channel. This solution can use the external coolant in the fourth flow channel to dissipate heat for the cooling medium in the two sub-flow channels. Specifically, the above-mentioned first sub-flow channel can be connected to the third flow channel, and the second sub-flow channel can be connected to the second flow channel. In this embodiment, the cooling medium flowing through the electronic component can be separated from the cooling medium flowing through the motor, which is beneficial to reduce impurities in the cooling medium flowing through the above-mentioned electronic component, and is beneficial to reduce the risk of short circuit of the electronic component.

[0012] In order to set up the above-mentioned heat exchanger, the first shell can have a first recess and the second shell can have a second recess. After the first shell and the second shell are buckled, the first recess and the second recess are opposite to each other and form a storage space, and the heat exchanger is located in the storage space. The first sub-flow channel is located in the first recess, and the second sub-flow channel is located in the second recess. The first shell and the second shell are buckled, and the outer wall of the first sub-flow channel and the outer wall of the second sub-flow channel form a fourth flow channel. This solution can improve the integration of the powertrain and help reduce the volume of the powertrain.

[0013] In another technical solution, the first shell has a first recess, and the second shell has a second recess. After the first shell and the second shell are buckled, the first recess and the second shell are opposite to each other and form a first accommodation space, the second recess and the first shell are opposite to each other and form a second accommodation space, a part of the heat exchanger is located in the first accommodation space, and the other part is located in the second accommodation space. The first sub-flow channel is located in the first recess, the second sub-flow channel is located in the second recess, and the first shell and the second shell are buckled. A part of the fourth flow channel is formed between the outer wall of the first sub-flow channel and the second shell. A part of the fourth flow channel is also formed between the outer wall of the second sub-flow channel and the first shell. The two parts of the fourth flow channel are connected in series so that the external coolant flows through the two parts of the fourth flow channel, respectively taking away the heat of the cooling medium in the first sub-flow channel and the second sub-flow channel. This solution can also improve the integration of the powertrain and help reduce the volume of the powertrain.

[0014] The power assembly may further include a filter. The specific location of the filter is not limited. As long as the filter is connected to the first flow channel, the filter can be arranged in the circuit of the cooling medium.

[0015] In a further technical solution, the filter is connected to the liquid inlet of the second flow channel. This solution allows the cooling medium to be filtered before entering the electronic component to improve the cleanliness of the cooling medium entering the electronic component and reduce the risk of short circuit of the electronic component.

[0016] When the heat dissipation of the electronic component is specifically realized, the electronic component may include an electronic device and a heat sink, and the electronic device is thermally connected to the heat sink. The heat sink has a cavity inside, and the second flow channel passes through the heat sink, or the cavity of the heat sink is a part of the second flow channel. The cooling medium flows through the heat sink, thereby dissipating heat for the electronic device.

[0017] In another technical solution, the electronic assembly includes an electronic device and a heat dissipation cavity, and the electronic device is disposed in the cavity of the heat dissipation cavity. At least part of the structure of the second flow channel is located in the heat dissipation cavity, and the heat dissipation cavity becomes a part of the second flow channel, so that the cooling medium flows through the cavity of the heat dissipation cavity. This solution allows the electronic device to be immersed in the cooling medium to improve the heat dissipation capacity of the electronic device.

[0018] In a specific technical solution, the surface of the electronic device is provided with heat dissipation fins, and the heat dissipation fins can be immersed in a cooling medium to improve the heat dissipation efficiency of the electronic device.

[0019] The power assembly may include a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium. The mechanical oil pump is connected to the motor, and the motor can be used to drive the mechanical oil pump to move. The cooling medium of the power assembly can be driven to flow between the various flow channels. In this solution, the motor can drive the flow of the cooling medium during operation without the need for an additional driver, which is conducive to reducing the energy consumption of the power assembly and achieving the purpose of energy saving.

[0020] In a further technical solution, the powertrain may further include an electronic oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium. The mechanical oil pump cooperates with the electronic oil pump. When the mechanical oil pump can meet the flow rate requirement of the cooling medium, only the mechanical oil pump can be used to drive the flow of the cooling medium, thereby achieving energy saving. Especially for electric vehicles, it can reduce the consumption of electricity, thereby improving the vehicle's endurance. In addition, at low temperatures, the cooling medium is more viscous, and the mechanical oil pump can also more reliably drive the flow of the cooling medium, thereby ensuring that the refrigeration system can be started at low temperatures. When the working conditions are relatively harsh, that is, when the heat dissipation demand is large, the electronic oil pump can be started to increase the flow rate of the cooling medium, improve the heat dissipation capacity of the powertrain, and ensure the heat dissipation effect of the powertrain.

[0021] In addition, when the powertrain includes an electronic oil pump and the electronic oil pump is connected to the first flow channel, the electronic oil pump can also be electrically connected to a controller, and the controller is used to control the forward or reverse rotation of the electronic oil pump. The electronic oil pump in this solution can be reversed to reversely flush impurities in each flow channel or filter to ensure that the cooling medium can be in a working state, thereby improving the heat dissipation reliability during the operation of the powertrain.

[0022] In a second aspect, the present application further provides a mechanical device, which includes an output unit, a transmission mechanism, and the powertrain of the first aspect. The powertrain is connected to the output unit via a transmission mechanism. Specifically, the mechanical device may be an electric vehicle. The powertrain in this solution has a strong heat dissipation capacity and a high degree of integration, which is conducive to reducing the space occupied by the powertrain and improving the performance of the mechanical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a cooling medium flow of a powertrain in the prior art;

[0024] Figure 2 A schematic diagram of the structure of an electric vehicle in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a powertrain in an embodiment of the present application;

[0026] Figure 4A schematic diagram of a cooling medium flow of a power assembly in an embodiment of the present application;

[0027] Figure 5 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0028] Figure 6 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0029] Figure 7 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0030] Figure 8 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0031] Fig. 9 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0032] Fig.10 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0033] Fig.11 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0034] Fig.12 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0035] Fig.13 Schematic diagrams of several cooling medium flows in the power assembly in the embodiments of the present application;

[0036] Fig.14 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0037] Fig.15 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0038] Fig.16 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0039] Fig.17 Another structural schematic diagram of the powertrain in the embodiment of the present application;

[0040] Fig.18 Another structural schematic diagram of the powertrain in the embodiment of the present application;

[0041] Fig.19 Another structural schematic diagram of the powertrain in the embodiment of the present application;

[0042] Fig. 20 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0043] Fig.21 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0044] Fig. 22 A schematic diagram of the structure of an electronic component in an embodiment of the present application;

[0045] Fig.23 A schematic diagram of the structure of an electronic component in an embodiment of the present application;

[0046] Fig.24 Another schematic diagram of cooling medium flow in the power assembly in the embodiment of the present application;

[0047] Fig.25 This is another schematic diagram of the cooling medium flow of the powertrain in an embodiment of the present application.

[0048] Reference numerals:

[0049] 10-frame; 20-output unit;

[0050] 30-transmission mechanism; 40-power assembly;

[0051] 1-heat exchanger; 11-first flow channel;

[0052] 111-first sub-flow channel; 112-second sub-flow channel;

[0053] 12- fourth flow channel; 2- electronic components;

[0054] 21-the first shell; 211-the first recess;

[0055] 22-second flow channel; 23-first sub-section;

[0056] 24- second sub-section; 25- sixth flow channel;

[0057] 26- electronic device; 27- heat sink;

[0058] 28-heat dissipation cavity; 29-heat dissipation fins;

[0059] 3-motor; 31-second housing;

[0060] 311-Second recess; 32-Third flow channel;

[0061] 4- reducer; 41- third housing;

[0062] 42-fifth flow channel; 5-filter;

[0063] 6-Mechanical oil pump; 7-Electronic oil pump. DETAILED DESCRIPTION

[0064] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context.

[0065] References to "one embodiment" or "a specific embodiment" described in this specification mean that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. The terms "include", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0066] In order to facilitate the understanding of the powertrain and mechanical equipment provided in the embodiments of the present application, the following first introduces its application scenarios. At present, vehicles are used in more and more scenarios in production and life, especially the application of electric vehicles is also gradually increasing, and the powertrain, as the power component of electric vehicles, plays a vital role in the performance of electric vehicles. During the operation of the powertrain, a large amount of heat will be generated. Therefore, an important measure to ensure that the powertrain works stably and has a long service life is to maintain effective heat dissipation. In addition, with the development of technology, there are more and more integrated structures of the powertrain, so it is also crucial to improve the integration of the powertrain and reduce the volume of the powertrain. To this end, the present application provides a powertrain and mechanical equipment.

[0067] The specific type of the mechanical equipment in the embodiment of the present application is not limited. For example, the mechanical equipment may be an electric vehicle (EV), a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (NEV), a battery management device (Battery Management), a motor & driver (Motor & Driver), a power converter (Power Converter), a reducer (Reducer), etc. In conjunction with the accompanying drawings, the mechanical equipment in the embodiment of the present application is briefly introduced as an electric vehicle.

[0068] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0069] It is worth noting that the "connectivity" mentioned in the embodiments of the present application refers to the fact that liquid (external coolant or cooling medium) can flow between two structures, and the two can be directly connected or connected through other structures, as long as the flow of liquid can be achieved. For example, A is connected to B, including a direct connection between A and B, or C is also connected between A and B, and the liquid flows through A, C and B in sequence. The "connection" in the embodiments of the present application refers to the fact that two structures are directly connected or connected through a pipeline without other structures. In addition, the "flow channel" mentioned in the embodiments of the present application refers to the fact that the liquid can flow through the flow channel, and there is no restriction on the shape of the flow channel. For example, the flow channel can be an elongated tubular shape, or a cavity, etc., as long as the liquid can flow.

[0070] Figure 2 This is a schematic diagram of the structure of an electric vehicle in the embodiment of the present application, please refer to Figure 2, the mechanical device in the embodiment of the present application includes a frame 10, an output part 20, a transmission mechanism 30 and a power assembly 40. The output part 20, the transmission mechanism 30 and the power assembly 40 are installed on the frame 10, and the power assembly 40 is connected to the output part 20 through the transmission mechanism 30. The power assembly 40 is used to convert electrical energy into mechanical energy, and the transmission mechanism 30 is connected to the power assembly 40 to transmit the mechanical energy to the output part 20 of the mechanical device, and the output part 20 is used to output the mechanical energy generated by the power assembly 40. In a specific embodiment, when the mechanical device is a vehicle such as an electric car, the output part 20 can specifically be a wheel.

[0071] Figure 3 is a structural schematic diagram of a powertrain in an embodiment of the present application, Figure 4 Schematic diagram of a cooling medium flow of a powertrain in an embodiment of the present application, wherein: Figure 3 It shows a connection relationship between the various structures of the powertrain. Figure 4 It is mainly used to illustrate the flow path of the cooling medium of the powertrain. Figure 3 and Figure 4As shown, an embodiment of the present application also provides a powertrain, which includes a heat exchanger 1, an electronic component 2 and a motor 3. The electronic component 2 includes a first shell 21, and the electronic component includes an electronic device, which is arranged in the accommodation cavity of the first shell 21. The motor 3 may specifically include a second shell 31, and the stator and mover and other structures of the motor 3 are arranged in the accommodation cavity of the second shell 31. The first shell 21 is fixedly connected to the second shell 31, and the heat exchanger 1 is fixedly arranged with the second shell 31, so that the heat exchanger 1, the electronic component 2 and the motor 3 are integrated into an integrated powertrain, which is convenient for assembling the powertrain and is also beneficial for reducing the volume of the powertrain. The heat exchanger 1 includes a first flow channel 11, which is used to transmit a cooling medium, and the cooling medium is used to dissipate heat for the components of the powertrain. For example, the cooling medium is used to dissipate heat for the electronic component 2 and the motor 3. Specifically, the electronic component 2 further includes a second flow channel 22, which passes through the accommodation cavity of the first housing 21, and the second flow channel 22 is connected to the first flow channel 11, so that the cooling medium can flow to the second flow channel 22, thereby dissipating heat for the electronic device in the accommodation cavity of the electronic component 2. The motor 3 further includes a third flow channel 32, which passes through the accommodation cavity of the second housing 31, and the third flow channel 32 is also connected to the first flow channel 11, so that the cooling medium can flow to the third flow channel 32, thereby dissipating heat for the motor components in the accommodation cavity of the motor 3. In the embodiment of the present application, the same cooling medium can be used to dissipate heat for the electronic component 2 and the motor 3, which is conducive to improving the integration of the powertrain and reducing the volume of the powertrain. In addition, the cooling medium is usually an insulating cooling oil. Therefore, when the cooling medium is used to dissipate heat for the electronic component 2, there is no risk of short circuit. In addition, it is also conducive to improving the heat dissipation effect of the electronic component 2, and improving the heat dissipation capacity and heat dissipation efficiency of the electronic component 2.

[0072] Please continue to refer to Figure 4 In a specific embodiment, the heat exchanger further includes a fourth flow channel 12, which is used to transmit an external coolant, and a heat exchange wall is provided between the first flow channel 11 and the fourth flow channel 12. That is to say, the first flow channel 11 and the fourth flow channel 12 are connected in a heat exchange manner, so that the external coolant and the cooling medium can exchange heat. For example, the first flow channel 11 and the fourth flow channel 12 are arranged adjacent to each other, so that the cooling medium and the external coolant can exchange heat through the heat exchange wall. Specifically, the cooling medium is mainly used to dissipate heat for the powertrain, and the external coolant is mainly used to displace the heat brought by the cooling medium and take it away, so that the cooling medium can be recycled. This solution is conducive to improving the heat exchange capacity of the heat exchanger, thereby improving the heat dissipation capacity of the powertrain.

[0073] In another embodiment, the cooling medium in the first flow channel 11 can also be cooled by fresh air, that is, a radiator can be arranged outside the first flow channel 11 to improve the heat dissipation capacity of the cooling medium in the first flow channel.

[0074] The external coolant in the embodiment of the present application can specifically be an air-conditioning system refrigerant, air-conditioning coolant or air-cooling system coolant, etc., and the present application does not impose any limitation thereto.

[0075] In a specific embodiment, the order in which the cooling medium flows through the electronic components 2 and the motor 3 is not limited. Figure 4 As shown, the first flow channel 11, the second flow channel 22 and the third flow channel 32 are connected in sequence, then after the cooling medium flows out of the first flow channel 11, it first flows to the second flow channel 22 for dissipating heat for the electronic component 2, and then flows to the third flow channel 32 for dissipating heat for the motor 3. Since the cooling medium may directly contact the electronic devices in the electronic component 2, the cleanliness requirements for the cooling medium are relatively high. To this end, the cooling medium can be made to flow to the electronic component 2 first, and then to the motor 3, so as to reduce the amount of impurities taken away by the cooling medium from the motor 3 and flowing to the electronic component 2, so as to reduce the short circuit risk of the electronic component 2. Of course, in other embodiments, the first flow channel 11, the third flow channel 32 and the second flow channel 22 can also be connected in sequence. It can be understood that the above-mentioned second flow channel 22 and the third flow channel 32 are connected in series. Figure 5 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Figure 5 As shown, in another embodiment, the second flow channel 22 and the third flow channel 32 are respectively connected to the first flow channel 11, that is, after the cooling medium flows out of the first flow channel 11, a part flows to the second flow channel 22, and the other part flows to the third flow channel 32. It can be understood that the third flow channel 32 is connected in parallel with the second flow channel 22. In short, the first flow channel 11, the third flow channel 32 and the second flow channel 22 are connected to form a cooling circuit.

[0076] Figure 6 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Figure 6 As shown, in another embodiment, the power assembly may further include a reducer 4, the reducer 4 includes a third housing 41, and the third housing 41 is fixedly arranged with the second housing 31. Specifically, the second housing 31 and the third housing 41 may be fixedly connected by a connection structure such as screws, or the second housing 31 and the third housing 41 may be an integral structure. The reducer 4 may be connected to the motor 3 through a transmission shaft. The reducer 4 may change the driving force output by the power assembly according to different driving conditions of the electric vehicle, thereby driving the wheels to rotate at different speeds, and realizing variable speed driving of the electric vehicle.

[0077] like Figure 6 As shown, the reducer 4 may not use the cooling medium to dissipate heat, thereby reducing impurities in the cooling medium to improve the cleanliness of the cooling medium.

[0078] Figure 7 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Figure 7 As shown, in another embodiment, the reducer 4 may further include a fifth flow channel 42, which passes through the accommodation cavity of the third shell 41. The fifth flow channel 42 is connected to the first flow channel 11. The cooling medium can flow to the fifth flow channel 42 to dissipate heat for the structure of the reducer 4 located in the accommodation cavity of the third shell 41, and can also lubricate the rotating parts in the reducer 4, such as gears or shafts.

[0079] When the reducer 4 includes the fifth flow channel 42, the connection sequence of the first flow channel 11, the second flow channel 22, the third flow channel 32 and the fifth flow channel 42 is not limited. Figure 7 As shown, in one embodiment, the first flow channel 11, the second flow channel 22, the third flow channel 32 and the fifth flow channel 42 are connected in sequence. Since there are relatively many impurities in the reducer 4, in this solution, the cooling medium finally flows through the reducer 4, which can reduce the impurities flowing to the electronic components 2 and the motor 3. In addition, the various flow channels in this solution are equivalent to being connected in series, so the total number of connection ports is small, which is conducive to reducing the risk of leakage. Figure 8 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Figure 8 As shown, in another embodiment, the second flow channel 22, the third flow channel 32 and the fifth flow channel 42 can be connected to the first flow channel 11 respectively, that is, the second flow channel 22, the third flow channel 32 and the fifth flow channel 42 are connected in parallel. In this solution, the cooling medium flowing to the motor 3, the electronic component 2 and the reducer 4 is retained between the heat exchanger 1, so the temperature is relatively low, which is beneficial to improving the heat dissipation capacity and heat dissipation efficiency of various parts of the powertrain. Fig. 9 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig. 9 As shown, in another embodiment, the first flow channel 11, the second flow channel 22 and the third flow channel 32 can be connected in sequence, and the fifth flow channel 42 can be connected to the first flow channel 11. The present application does not limit the connection sequence of the first flow channel 11, the second flow channel 22, the third flow channel 32 and the fifth flow channel 42, and there can be other embodiments as long as the cooling medium can flow to the above-mentioned motor 3, electronic component 2 and reducer 4, which are not listed here one by one.

[0080] Fig.10 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.10As shown, in the embodiment of the present application, the electronic component 2 includes a first sub-section 23 and a second sub-section 24. The first shell 21 includes a first accommodating cavity and a second accommodating cavity, the first sub-section 23 is arranged in the first accommodating cavity, and the second sub-section 24 is arranged in the second accommodating cavity. That is to say, the first sub-section 23 and the second sub-section 24 are respectively arranged in different accommodating cavities. In a specific embodiment, the first sub-section 23 may include a microcontroller unit (MCU), and the electronic device included in the first sub-section 23 may be an insulated gate bipolar transistor (IGBT); the second sub-section 24 may include an on-board charger (OBC), or may also include a power distribution unit (PDU).

[0081] like Fig.10 In the embodiment shown, the second flow channel 22 is disposed in the first accommodating cavity, so that the cooling medium in the second flow channel 22 can be used to dissipate heat for the first sub-section 23. In other words, a part of the structure of the electronic component 2 can be dissipated by the cooling medium. Specifically, the first sub-section 23 generates a large amount of heat, and this solution is conducive to improving the heat dissipation effect of the first sub-section 23.

[0082] Regarding the heat dissipation method of the second sub-section 24 of the electronic component 2, as shown in FIG. Fig.10 In the illustrated embodiment, the second sub-section 24 may not be provided with a liquid cooling structure, and may use natural heat dissipation to dissipate heat. Fig.11 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.11 As shown, in one embodiment, when the second sub-section 24 is subjected to liquid cooling, the second accommodating chamber is provided with a sixth flow channel 25. The sixth flow channel 25 is connected to the fourth flow channel 12, and the external coolant can flow through the second sub-section 24 through the sixth flow channel 25, thereby using the external coolant to dissipate heat for the second sub-section 24.

[0083] Fig.12 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.12 As shown, in another embodiment, the sixth flow channel 25 is also connected to the first flow channel 11, and the cooling medium can flow to the second sub-section 24 through the sixth flow channel 25, and the cooling medium can be used to dissipate heat from the second sub-section 24. In this embodiment, the cooling medium can be used to dissipate heat from the entire structure of the powertrain, so as to improve the integration of the powertrain and reduce the volume of the powertrain.

[0084] When the cooling medium is used to dissipate heat for the first sub-section 23, the second sub-section 24, the motor 3 and the reducer 4, it is only necessary to make the second flow channel 22, the third flow channel 32, the fifth flow channel 42 and the sixth flow channel 25 all connected to the first flow channel 11, so that the cooling medium can flow to the third flow channel 32, the second flow channel 22, the fifth flow channel 42 and the sixth flow channel 25, and there is no restriction on the flow order of the cooling medium. For example, in one embodiment, Fig.12 As shown, the second flow channel 22 and the sixth flow channel 25 can be connected in series, and then connected in parallel with the third flow channel 32 and the fifth flow channel 42 . Fig.13 Schematic diagrams of several cooling medium flows in the powertrain in the embodiments of the present application, such as Fig.13 As shown in (a) to (g) in other embodiments, the second flow channel 22, the third flow channel 32, the fifth flow channel 42 and the sixth flow channel 25 are connected to the first flow channel 11 in various ways, for example, Fig.13 As shown in (a), the first flow channel 11, the second flow channel 22, the sixth flow channel 25, the third flow channel 32 and the fifth flow channel 42 are connected in sequence to realize series connection. In this solution, the shells can be directly connected using the connection ports provided on the shells, thereby reducing the connection parts and reducing the risk of leakage. In addition, Fig.13 In the embodiment shown in (b), the second flow channel 22, the sixth flow channel 25, the third flow channel 32 and the fifth flow channel 42 respectively form a loop with the first flow channel 11 to achieve parallel connection, which is conducive to improving the heat dissipation capacity. Fig.13 As shown in (c) to (g) in the figure, in other embodiments, there may be other connection methods, which are not described in detail here.

[0085] Fig.14 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.14 As shown, in another embodiment, the first flow channel 11 includes a first sub-flow channel 111 and a second sub-flow channel 112. The first sub-flow channel 111 and the second sub-flow channel 112 can be specifically arranged on both sides of the fourth flow channel 12. Specifically, the heat exchange wall includes a first heat exchange wall and a second heat exchange wall. The first heat exchange wall is located between the first sub-flow channel and the second flow channel to achieve heat exchange between the cooling medium in the first sub-flow channel and the external cooling medium in the second flow channel; the second heat exchange wall is located between the second sub-flow channel and the second flow channel to achieve heat exchange between the cooling medium in the second sub-flow channel and the external cooling liquid in the second flow channel. The external cooling liquid in the fourth flow channel 12 is used to take away the heat of the cooling medium in the first sub-flow channel 111 and the second sub-flow channel 112.

[0086] like Fig.14As shown, the first sub-channel 111 can be connected to the third channel 32, and the second sub-channel 112 can be connected to the second channel 22. In this embodiment, the cooling medium flowing through the electronic component 2 can be separated from the cooling medium flowing through the motor 3, which is beneficial to reduce impurities in the cooling medium flowing through the electronic component 2, and is beneficial to reduce the short circuit risk of the electronic component 2.

[0087] In a specific embodiment, the flow direction of the cooling medium in the first sub-channel 111 and the second sub-channel 112 is not limited by the present application. Fig.15 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.15 As shown, in another embodiment, when the electronic component 2 includes a first sub-section 23 and a second sub-section 24, the second flow channel 22 of the first sub-section 23 can be connected to the second sub-flow channel 112, and the sixth flow channel 25 of the second sub-section 24 can be connected to the fourth flow channel 12. Or, Fig.16 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.16 As shown, in another embodiment, the second channel 22 of the first sub-portion 23 is connected to the second sub-channel 112, and the sixth channel 25 of the second sub-portion 24 is also connected to the second sub-channel 112, that is, the entire electronic component 2 uses the cooling medium in the second sub-channel 112 to dissipate heat.

[0088] In order to further improve the integration of the power assembly, the heat exchanger 1 may be formed in the housing of the power assembly. Fig.17 Another structural diagram of the powertrain in the embodiment of the present application is shown in FIG. Fig.17 As shown, in one embodiment, the first shell 21 has a first recess 211, and the first sub-channel 111 is located in the first recess 211. Specifically, the first sub-channel 111 can be fixedly connected to the first shell 21, or the first sub-channel 111 can be integrally formed with the first shell 21. The second shell 31 has a second recess 311, and the second sub-channel 112 is located in the second recess 311. Similarly, the second sub-channel 112 can be fixedly connected to the second shell 31, or the second sub-channel 112 can be integrally formed with the second shell 31. Fig.18 Another structural diagram of the powertrain in the embodiment of the present application is shown in FIG. Fig.18 As shown, after the first housing 21 and the second housing 31 are buckled together, the first recess 211 and the second recess 311 are opposite to each other and form a receiving space, which is equivalent to the heat exchanger being located in the receiving space. The first sub-channel 111 and the second sub-channel 112 are opposite to each other, and the outer wall of the first sub-channel 111 and the outer wall of the second sub-channel 112 form a fourth channel 12. This solution can improve the integration of the powertrain and help reduce the volume of the powertrain.

[0089] Fig.19 Another structural diagram of the powertrain in the embodiment of the present application is shown in FIG. Fig.19 As shown, in another embodiment, the first shell 21 also has a first recess 211, and the first sub-channel 111 is located in the first recess 211. Specifically, the first sub-channel 111 can be fixedly connected to the first shell 21, or the first sub-channel 111 can be integrally formed with the first shell 21. The second shell 31 also has a second recess 311, and the second sub-channel 112 is located in the second recess 311. Similarly, the second sub-channel 112 can be fixedly connected to the second shell 31, or the second sub-channel 112 can be integrally formed with the second shell 31. However, when the first shell 21 and the second shell 31 are buckled together, the first recess 211 is opposite to the second shell 31 and forms a first accommodation space, which is equivalent to the first sub-channel 111 being located in the first accommodation space; the second recess 311 is opposite to the first shell 21 and forms a second accommodation space, which is equivalent to the second sub-channel 112 being located in the second accommodation space. That is to say, a part of the heat exchanger is located in the first accommodation space, and the other part is located in the second accommodation space. Of course, the heat exchanger can also include other structures, which are located outside the first accommodation space and the second accommodation space, and this application does not limit it. The above-mentioned first sub-channel 111 and the second sub-channel 112 are staggered, and the outer wall of the first sub-channel 111 and the outer wall of the second shell 31 form a part of the fourth channel 12, and the outer wall of the second sub-channel 112 and the outer wall of the first shell 21 also form a part of the fourth channel 12. The two parts of the fourth channel 12 are connected in series, so that the external coolant flows through the two parts of the above-mentioned fourth channel 12, and takes away the heat of the cooling medium in the first sub-channel 111 and the second sub-channel 112 respectively. This solution can also improve the integration of the powertrain, which is conducive to reducing the volume of the powertrain.

[0090] Fig. 20 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig. 20 As shown, in another embodiment, in order to improve the cleanliness of the cooling medium, the powertrain can further include a filter 5. The specific location of the filter 5 is not limited. Fig. 20 In the illustrated embodiment, as long as the filter 5 is connected to the first flow channel 11 , the filter 5 can be disposed in the circuit of the cooling medium.

[0091] Fig.21 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.21As shown, in another embodiment, the above-mentioned filter 5 can also be set on the outside of the liquid inlet of the second flow channel 22, that is, the filter 5 is connected to the liquid inlet of the second flow channel 22, so that the cooling medium can be filtered before entering the electronic component 2, so as to improve the cleanliness of the cooling medium entering the electronic component 2 and reduce the short circuit risk of the electronic component 2.

[0092] Of course, in a specific embodiment, the number of filters 5 included in the powertrain is not limited, and may include one filter 5 or at least two filters 5. For example, Fig. 20 The powertrain in the embodiment shown comprises a filter 5, Fig.21 The drive train in the illustrated embodiment comprises two filters 5 .

[0093] This application does not limit the configuration of the second flow channel 22. Fig. 22 Schematic diagram of the structure of an electronic component in an embodiment of the present application. Fig. 22 As shown, in one embodiment, the electronic assembly 2 includes an electronic device 26 and a heat sink 27, the electronic device 26 is thermally connected to the heat sink 27, and the heat sink 27 is used to dissipate heat from the electronic device 26. The heat sink 27 has an inner cavity, which can be used as a part of the second flow channel 22, that is, at least part of the structure of the second flow channel 22 is located in the heat sink 27. This solution allows the cooling medium to flow through the heat sink 27, thereby dissipating heat for the electronic device 26.

[0094] Fig.23 Schematic diagram of the structure of an electronic component in an embodiment of the present application. Fig.23 As shown, in another embodiment, the electronic assembly 2 includes an electronic device 26 and a heat dissipation cavity 28. The electronic device 26 is disposed in the cavity of the heat dissipation cavity 28, and the cavity of the heat dissipation cavity 28 serves as a part of the second flow channel 22, that is, at least part of the structure of the second flow channel 22 is located in the heat dissipation cavity 28. When the cooling medium flows through the cavity of the heat dissipation cavity 28, the electronic device 26 can be immersed in the cooling medium, thereby improving the heat dissipation capacity of the electronic device 26.

[0095] Please continue to refer to Fig.23 The surface of the electronic device 26 is provided with heat dissipation fins 29, and the heat dissipation fins 29 are also immersed in the cooling medium, thereby increasing the heat dissipation area of ​​the electronic device 26 and improving the heat dissipation capacity of the electronic device 26.

[0096] Fig.24 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.24As shown, in the embodiment of the present application, the powertrain also includes a mechanical oil pump 6, which is connected to the first flow channel 11, so as to drive the cooling medium to flow in the first flow channel 11, and then drive the cooling medium to flow in the cooling circuit. The above-mentioned mechanical oil pump 6 is connected to the motor 3 in a transmission manner, so that the motor 3 can drive the mechanical oil pump 6 to move, and then drive the flow of the cooling medium. In this solution, the motor can drive the flow of the cooling medium during operation without the need for an additional driver, which is conducive to reducing the energy consumption of the powertrain and achieving the purpose of energy saving.

[0097] In a specific embodiment, Fig.24 As shown, the mechanical oil pump 6 can be connected to the reducer 4 to drive the mechanical oil pump 6 to move. The specific location of the mechanical oil pump 6 is not limited, as long as it can drive the cooling medium to flow.

[0098] Fig.25 FIG. 1 is another schematic diagram of the cooling medium flow of the power assembly in the embodiment of the present application, such as Fig.25 In a further embodiment, the powertrain further includes an electronic oil pump 7, which is also connected to the first flow channel 11, so as to drive the cooling medium to flow in the first flow channel 11, and then drive the cooling medium to flow in the cooling circuit. In this embodiment, the mechanical oil pump 6 can be matched with the electronic oil pump 7. When the mechanical oil pump 6 can meet the flow rate requirement of the cooling medium, the mechanical oil pump 6 can be used to drive the flow of the cooling medium, so as to achieve energy saving. Especially for electric vehicles, the power consumption can be reduced, thereby improving the endurance of the vehicle. In addition, at low temperatures, the cooling medium is relatively viscous, and the mechanical oil pump 6 can also reliably drive the cooling medium to flow, thereby ensuring that the refrigeration system can be started at low temperatures. When the working conditions are relatively harsh, that is, when the heat dissipation demand is large, the electronic oil pump 7 can be started to increase the flow rate of the cooling medium, improve the heat dissipation capacity of the powertrain, and ensure the heat dissipation effect of the powertrain.

[0099] When the powertrain includes an electronic oil pump 7, the electronic oil pump 7 can be electrically connected to the controller, and the controller can control the electronic oil pump 7 to rotate forward or reverse. After the cooling medium in the powertrain flows for a period of time, impurities may clog the narrow pipes or filters 5, such as the second flow channel 22 of the electronic component 2. At this time, the electronic oil pump 7 can be controlled to reverse to reversely flush the impurities, so that the impurities will not adhere to a certain place for a long time and cause pipe blockage, so as to ensure that the cooling medium can be in a working state and improve the heat dissipation reliability during the operation of the powertrain.

[0100] The present application does not impose any limitation on the method of controlling the reverse rotation of the electronic oil pump 7. For example, it can be performed on a regular basis, that is, after a certain period of time, the electronic oil pump 7 is controlled to reverse for a period of time; or, a sensor can be set in the cooling circuit, and when a blockage is detected in the flow channel of the cooling medium, the electronic oil pump 7 is controlled to reverse for a period of time.

[0101] In addition, when the powertrain is started at a low temperature, the temperature of the cooling medium is low, and it may be viscous and have poor fluidity. The cooling medium can be dissipated first. Specifically, the cooling medium can be made to flow first, while the external coolant does not flow. The heat generated by the powertrain increases the temperature of the cooling medium, but the increased temperature is not taken away by the external coolant, so that the cooling medium can be preheated.

[0102] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A powertrain, characterized in that: It includes a heat exchanger, an electronic component and a motor, wherein the electronic component includes a first shell, the motor includes a second shell, the first shell is fixedly connected to the second shell, and the heat exchanger is fixedly arranged on the first shell; The electronic assembly includes an electronic device, which is arranged in the accommodating cavity of the first shell; the heat exchanger includes a first flow channel, which is used to transmit a cooling medium; the electronic assembly includes a second flow channel, which passes through the accommodating cavity of the first shell, and the second flow channel is communicated with the first flow channel; the motor includes a third flow channel, which passes through the accommodating cavity of the second shell, and the third flow channel is communicated with the first flow channel; The heat exchanger further comprises a fourth flow channel, the fourth flow channel being used to transmit external cooling liquid, and a heat exchange wall being provided between the first flow channel and the fourth flow channel; The first flow channel includes a first sub-flow channel and a second sub-flow channel, the heat exchange wall includes a first heat exchange wall and a second heat exchange wall, the first heat exchange wall is located between the first sub-flow channel and the fourth flow channel, and the second heat exchange wall is located between the second sub-flow channel and the fourth flow channel; the first sub-flow channel is connected to the third flow channel, and the second sub-flow channel is connected to the second flow channel.

2. The powertrain according to claim 1, characterized in that: It also includes a reducer, which includes a third shell, the third shell is fixedly arranged with the second shell, and the reducer includes a fifth flow channel, the fifth flow channel passes through the accommodating cavity of the third shell, and the fifth flow channel is communicated with the first flow channel.

3. The powertrain according to claim 1 or 2, characterized in that: The electronic component includes a first sub-section and a second sub-section, the first shell includes a first accommodating cavity and a second accommodating cavity, the first sub-section is arranged in the first accommodating cavity, the second sub-section is arranged in the second accommodating cavity, and the second flow channel is arranged in the first accommodating cavity.

4. The powertrain according to claim 3, characterized in that: The second accommodating chamber includes a sixth flow channel, and the sixth flow channel is communicated with the fourth flow channel.

5. The powertrain according to claim 1, characterized in that: The electronic component includes a first sub-section and a second sub-section, the first shell includes a first accommodating cavity and a second accommodating cavity, the first sub-section is arranged in the first accommodating cavity, the second sub-section is arranged in the second accommodating cavity, the second flow channel is arranged in the first accommodating cavity, the second accommodating cavity includes a sixth flow channel, and the sixth flow channel is connected to the first flow channel.

6. The powertrain according to claim 1, characterized in that: The first shell has a first recess; the second shell has a second recess, and after the first shell and the second shell are buckled together, the first recess and the second recess are opposite to each other and form a receiving space, and the heat exchanger is located in the receiving space; The first sub-channel is located in the first recess, the second sub-channel is located in the second recess, the first shell is buckled with the second shell, and the fourth channel is formed between the outer wall of the first sub-channel and the outer wall of the second sub-channel.

7. The powertrain according to claim 1, characterized in that: The first shell has a first recess; the second shell has a second recess; after the first shell and the second shell are buckled together, the first recess and the second shell are opposite to each other and form a first accommodation space, the second recess and the first shell are opposite to each other and form a second accommodation space, a part of the heat exchanger is located in the first accommodation space, and the other part is located in the second accommodation space; The first sub-channel is located in the first recess, the second sub-channel is located in the second recess, the first shell is buckled with the second shell, and a part of the fourth channel is formed between the outer wall of the first sub-channel and the second shell; a part of the fourth channel is also formed between the outer wall of the second sub-channel and the first shell.

8. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: A filter is also included, and the filter is communicated with the first flow channel.

9. The powertrain according to claim 8, characterized in that: The filter is connected to the liquid inlet of the second flow channel.

10. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: The electronic assembly comprises an electronic device and a heat sink, the electronic device is thermally connected to the heat sink, the second flow channel passes through the heat sink, and the cooling medium flows through the heat sink.

11. The powertrain according to claim 3, characterized in that: The electronic assembly comprises an electronic device and a heat sink, the electronic device is thermally connected to the heat sink, the second flow channel passes through the heat sink, and the cooling medium flows through the heat sink.

12. The powertrain according to claim 8, characterized in that: The electronic assembly comprises an electronic device and a heat sink, the electronic device is thermally connected to the heat sink, the second flow channel passes through the heat sink, and the cooling medium flows through the heat sink.

13. The powertrain according to claim 9, characterized in that: The electronic assembly comprises an electronic device and a heat sink, the electronic device is thermally connected to the heat sink, the second flow channel passes through the heat sink, and the cooling medium flows through the heat sink.

14. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: The electronic assembly comprises an electronic device and a heat dissipation cavity, the electronic device is arranged in the cavity of the heat dissipation cavity, at least a part of the structure of the second flow channel is located in the heat dissipation cavity, and the cooling medium flows through the cavity of the heat dissipation cavity.

15. The powertrain according to claim 14, characterized in that: The surface of the electronic device is provided with heat dissipation fins.

16. The powertrain according to claim 8, characterized in that: The electronic assembly comprises an electronic device and a heat dissipation cavity, the electronic device is arranged in the cavity of the heat dissipation cavity, at least a part of the structure of the second flow channel is located in the heat dissipation cavity, and the cooling medium flows through the cavity of the heat dissipation cavity.

17. The powertrain according to claim 9, characterized in that: The electronic assembly comprises an electronic device and a heat dissipation cavity, the electronic device is arranged in the cavity of the heat dissipation cavity, at least a part of the structure of the second flow channel is located in the heat dissipation cavity, and the cooling medium flows through the cavity of the heat dissipation cavity.

18. The powertrain assembly according to claim 10, characterized in that: The electronic assembly comprises an electronic device and a heat dissipation cavity, the electronic device is arranged in the cavity of the heat dissipation cavity, at least a part of the structure of the second flow channel is located in the heat dissipation cavity, and the cooling medium flows through the cavity of the heat dissipation cavity.

19. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: It also includes a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium; the mechanical oil pump is transmission-connected to the motor, and the motor drives the mechanical oil pump to move.

20. The powertrain assembly according to claim 8, characterized in that: It also includes a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium; the mechanical oil pump is transmission-connected to the motor, and the motor drives the mechanical oil pump to move.

21. The power assembly according to claim 9, characterized in that: It also includes a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium; the mechanical oil pump is transmission-connected to the motor, and the motor drives the mechanical oil pump to move.

22. The powertrain assembly according to claim 10, characterized in that: It also includes a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium; the mechanical oil pump is transmission-connected to the motor, and the motor drives the mechanical oil pump to move.

23. The powertrain assembly according to claim 14, characterized in that: It also includes a mechanical oil pump, which is connected to the first flow channel and is used to drive the flow of the cooling medium; the mechanical oil pump is transmission-connected to the motor, and the motor drives the mechanical oil pump to move.

24. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

25. The powertrain assembly according to claim 8, characterized in that: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

26. The powertrain assembly according to claim 9, characterized in that: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

27. The powertrain assembly of claim 10, wherein: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

28. The powertrain assembly of claim 14, wherein: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

29. The power assembly of claim 19, wherein: It also includes an electronic oil pump, which is connected to the first flow channel and is used to drive the cooling medium to flow.

30. The power assembly according to any one of claims 1, 2, 4 to 7, characterized in that: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

31. The powertrain assembly of claim 8, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

32. The powertrain assembly of claim 9, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

33. The powertrain assembly of claim 10, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

34. The powertrain assembly of claim 14, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

35. The powertrain assembly of claim 19, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

36. The powertrain assembly of claim 24, wherein: It also includes an electronic oil pump, which is communicated with the first flow channel and is electrically connected to a controller, and the controller is used to control the electronic oil pump to rotate forward or reverse.

37. A mechanical device, characterized in that: It comprises an output part, a transmission mechanism and a power assembly as described in any one of claims 1 to 36, wherein the power assembly is connected to the output part through the transmission mechanism.

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