Power assembly in which flow splitting is performed via direct flow channel and electric vehicle

Abstract

The present application provides a power assembly in which flow splitting is performed via a direct flow channel and an electric vehicle. A housing of the power assembly comprises a motor containing cavity, a speed reducer containing cavity, a flow channel inlet, and a plurality of flow channel outlets. The motor containing cavity is used for containing a stator and a rotor of a motor. The speed reducer containing cavity is used for containing a gear and a bearing of a speed reducer. The flow channel inlet is used for transporting a cooling liquid to the plurality of flow channel outlets via a same transmission flow channel. Two flow channel outlets among the plurality of flow channel outlets are used for transporting a cooling liquid to the motor containing cavity and the speed reducer containing cavity, respectively. An outlet of an oil pump is used for transporting a cooling liquid to the flow channel inlet via a heat exchanger and a direct flow channel. A valve is used for adjusting the flow of the cooling liquid transported to the flow channel inlet by at least one of the heat exchanger and the direct flow channel. According to the present application, the working temperature of the cooling liquid can be adjusted to improve the working performance and service life of the power assembly.

Description

Power assembly and electric vehicle with direct connection flow channel shunting

[0001] The present application claims priority to the Chinese patent application No. 202410622446.1, filed on May 17, 2024, with the State Intellectual Property Office of China, with the title of "Power assembly and electric vehicle with direct connection flow channel shunting", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power assembly, in particular to a power assembly and electric vehicle with direct connection flow channel shunting. BACKGROUND

[0003] The power assembly transmits the cooling liquid through the transmission flow channel to cool each motor or lubricate the gear or bearing of the transmission mechanism, which is one of the key factors to ensure the working performance and service life of the power assembly. The working temperature of the cooling liquid will affect the cooling effect of the motor and the lubrication effect of the transmission mechanism. However, the working temperature of the cooling liquid in the power assembly is difficult to adaptively adjust according to different working conditions of the power assembly, thereby reducing the working performance and service life of the power assembly. SUMMARY

[0004] The present application provides a power assembly with direct connection flow channel shunting, which can adaptively adjust the working temperature of the cooling liquid according to different working conditions of the power assembly by optimizing the structure design of the internal flow channel of the power assembly, thereby improving the working performance and service life of the power assembly. The present application also provides an electric vehicle. The present application specifically includes the following technical solutions:

[0005] In a first aspect, the present application provides a power assembly with direct connection flow channel shunting, the housing of the power assembly includes an electric motor accommodating cavity, a reducer accommodating cavity, a flow channel inlet and a plurality of flow channel outlets, the electric motor accommodating cavity is used to accommodate the stator and rotor of an electric motor, the reducer accommodating cavity is used to accommodate the gear and bearing of a reducer, wherein the flow channel inlet is used to deliver the cooling liquid to the plurality of flow channel outlets through the same transmission flow channel, two flow channel outlets of the plurality of flow channel outlets are used to deliver the cooling liquid to the electric motor accommodating cavity and the reducer accommodating cavity respectively, the outlet of an oil pump is used to deliver the cooling liquid to the flow channel inlet through a heat exchanger and a direct connection flow channel respectively, and a valve is used to adjust the flow of the cooling liquid delivered to the flow channel inlet by at least one of the heat exchanger and the direct connection flow channel.

[0006] The shell of the power assembly of the application is integrated with a motor accommodating cavity and a reducer accommodating cavity for respectively accommodating a motor and a reducer of the power assembly and for fixing and protecting the motor and the reducer, so that the motor and the reducer can work normally and the working performance and service life of the motor and the reducer can be improved. A flow channel inlet and a plurality of flow channel outlets are formed on the shell, and the flow channel inlet and the plurality of flow channel outlets are communicated through a transmission flow channel, so that the external oil can be transported from the flow channel inlet into the transmission flow channel, and the coolant in the transmission flow channel is output through each flow channel outlet. Among them, two flow channel outlets of the plurality of flow channel outlets are respectively arranged on the inner wall of the motor accommodating cavity and the inner wall of the reducer accommodating cavity, so that the transmission flow channel can transport the coolant into the motor accommodating cavity and the reducer accommodating cavity through the two flow channel outlets respectively, and then the coolant can be transported to cool the stator and rotor of the motor and lubricate at least one of the gear and the bearing in the reducer, thereby improving the working performance and service life in the power assembly.

[0007] The coolant output from the outlet of the oil pump of the power assembly is transported into a heat exchanger and a direct connection flow channel respectively, and the coolant output from the heat exchanger and the direct connection flow channel is transported into a flow channel inlet, so that the coolant output from the heat exchanger and the direct connection flow channel can be transported into the motor accommodating cavity and the reducer accommodating cavity through a transmission flow channel. Among them, the coolant from the outlet of the oil pump can be transported into the heat exchanger and the direct connection flow channel respectively, and the coolant output from the heat exchanger and the direct connection flow channel can be transported from the flow channel inlet into the same transmission flow channel. Since the heat exchanger can exchange heat with the coolant to reduce the temperature of the coolant, adjusting the flow of the coolant transported into the flow channel inlet by the heat exchanger and the direct connection flow channel through a valve can adjust the temperature of the coolant transported into the flow channel inlet by the heat exchanger and the direct connection flow channel. It can be understood that the valve adjusts the flow of the coolant transported into the heat exchanger and the direct connection flow channel according to different working conditions of the power assembly, which can realize dynamic adjustment of the temperature of the coolant, thereby ensuring that the coolant can effectively cool the stator and rotor of the motor and effectively lubricate the gear and bearing of the reducer when the power assembly works under different working conditions, improving the adaptability of the power assembly to different working conditions, and further improving the working performance and service life of the power assembly. At the same time, the direct connection flow channel, the heat exchanger and the valve work together to realize dynamic adjustment of the temperature of the coolant transported into the transmission flow channel, and the internal structure of the shell can be reused to simplify the structural design of the shell.

[0008] One implementation, a direct flow channel includes a direct flow channel inlet and a direct flow channel outlet, a direct flow channel inlet is used to receive cooling liquid and is used to deliver cooling liquid to a direct flow channel outlet, wherein a direct flow channel inlet is used to deliver cooling liquid to a direct flow channel outlet through a valve.

[0009] Correspondingly, a direct flow channel is arranged on one side of a heat exchanger, and a valve is connected in series with a direct flow channel and located on one side of a heat exchanger, thereby achieving the adjustment of the flow of cooling liquid delivered to a heat exchanger and a direct flow channel through a valve, while reducing the structural size of the shell along the direction in which the oil pump outputs cooling liquid flow, and arranging a valve in the space of the shell using a direct flow channel to reduce the structural size of the shell along the direction in which a heat exchanger and a direct flow channel are arranged. That is, by arranging a valve in series with a direct flow channel, the internal structure design and overall structural size of the shell can be simplified, and the overall miniaturization design of the power assembly can be achieved.

[0010] One implementation, an outlet of an oil pump is used to deliver cooling liquid to an inlet of a heat exchanger and a direct flow channel inlet, respectively, and an outlet of a heat exchanger and a direct flow channel outlet are used to deliver cooling liquid to a flow channel inlet simultaneously.

[0011] Correspondingly, the outlet of an oil pump is in communication with the inlet of a heat exchanger and the direct flow channel inlet simultaneously, and a flow channel inlet is in communication with the outlet of a heat exchanger and the direct flow channel outlet, so that a direct flow channel and a heat exchanger form a parallel connection. When a valve adjusts the opening degree of the valve, the flow of cooling liquid delivered to the inlet of a heat exchanger and the direct flow channel inlet can be adjusted simultaneously, thereby achieving the effect of dynamically adjusting the temperature of the cooling liquid in a transmission flow channel. At the same time, a heat exchanger and a direct flow channel are arranged in parallel, and only one valve is needed to adjust the flow of cooling liquid of the inlet of a heat exchanger and the direct flow channel inlet in parallel, thereby achieving the simplification of the internal structure of the power assembly.

[0012] One implementation, along the direction of cooling liquid flowing in a direct flow channel, the flow distance of cooling liquid in a direct flow channel is greater than the interval between the inlet of a heat exchanger and the outlet of a heat exchanger, wherein the interval between a direct flow channel inlet and the outlet of an oil pump is less than the interval between the inlet of a heat exchanger and the outlet of an oil pump, and the interval between a direct flow channel outlet and a flow channel inlet is less than the interval between the outlet of a heat exchanger and a flow channel inlet.

[0013] Correspondingly, along the flow direction of the cooling liquid, one direct flow channel inlet is located between the outlet of one oil pump and the inlet of one heat exchanger, so that the cooling liquid output by the outlet of one oil pump can be first delivered into one direct flow channel inlet, thereby improving the effect of the valve on the flow of the cooling liquid delivered into one direct flow channel. Meanwhile, along the flow direction of the cooling liquid, one direct flow channel outlet is located between the outlet of one heat exchanger and one flow channel inlet, so that the cooling liquid output by one direct flow channel outlet is delivered into one flow channel inlet earlier than the cooling liquid output from the outlet of one heat exchanger, thereby reducing the influence of the temperature of the cooling liquid output from the outlet of one heat exchanger on the temperature of the cooling liquid output by one direct flow channel outlet, so as to improve the adjustment performance and temperature maintaining effect of the temperature of the cooling liquid delivered into one flow channel inlet.

[0014] One implementation manner is that the aperture of one direct flow channel is greater than the aperture of the inlet of one heat exchanger.

[0015] Correspondingly, since the greater the aperture, the smaller the flow resistance of the cooling liquid, the aperture of one direct flow channel is greater than the aperture of the inlet of one heat exchanger, so that the cooling liquid output by the outlet of one oil pump can be more easily delivered from the inlet of one direct flow channel into one direct flow channel, thereby avoiding the increase of the flow resistance of the cooling liquid due to the excessive bending of the flow path of one direct flow channel, and further improving the adjustment accuracy of the valve on the flow of the cooling liquid delivered into one heat exchanger and one direct flow channel, that is, further improving the accuracy of the valve on the temperature of the cooling liquid inside the powertrain assembly, and improving the adjustment sensitivity of the valve on the temperature of the cooling liquid.

[0016] One implementation manner is that one flow channel outlet is used for delivering the cooling liquid to one motor accommodating cavity, and the other flow channel outlet is used for delivering the cooling liquid to one speed reducer accommodating cavity, wherein along the flow direction of the cooling liquid, the flow distance of the cooling liquid from one flow channel inlet to one flow channel outlet is less than the flow distance of the cooling liquid from one flow channel inlet to the other flow channel outlet.

[0017] Correspondingly, along the direction of the flow of the cooling liquid, the cooling liquid input from one flow channel inlet first flows into one flow channel outlet and then flows into another flow channel outlet, so that the cooling liquid input from one flow channel inlet is first delivered into one motor accommodating cavity to dissipate heat from the stator and the rotor of one motor, and then delivered from another flow channel outlet into one speed reducer accommodating cavity to lubricate one gear or one bearing of one speed reducer. At the same time, the cooling liquid in one transmission flow channel is first delivered into one motor accommodating cavity and then delivered into one speed reducer accommodating cavity, so that the stator and the rotor of one motor accommodated in one motor accommodating cavity can heat the cooling liquid input from one flow channel outlet, so that the cooling liquid with a higher temperature is circulated in the power assembly first to increase the overall temperature of the cooling liquid in the power assembly, thereby improving the cooling liquid temperature increasing efficiency, and at the same time, improving the lubrication effect and efficiency when the cooling liquid is delivered into one speed reducer accommodating cavity through another flow channel outlet to lubricate one gear and one bearing of one speed reducer, and reducing the oil stirring loss of the gear shaft system of one speed reducer.

[0018] One implementation, the aperture of one flow channel outlet is smaller than the aperture of another flow channel outlet.

[0019] Correspondingly, the apertures of the two flow channel outlets are designed differently, so that the flow resistance of the cooling liquid to the two flow channel outlets is differentially adjusted and can adaptively distribute the flow of the cooling liquid to the two flow channel outlets. Specifically, by setting the aperture of one flow channel outlet for delivering the cooling liquid into one motor accommodating cavity to be smaller than the aperture of another flow channel outlet for delivering the cooling liquid into one speed reducer accommodating cavity, the flow resistance of the cooling liquid of one flow channel outlet is smaller than that of another flow channel outlet, so that the cooling liquid delivered from one flow channel inlet can be more easily delivered into another flow channel outlet, and the cooling liquid can be more distributed to another flow channel outlet. That is, by differentially setting the apertures of the two flow channel outlets, the flow of the cooling liquid delivered by one transmission flow channel into one motor accommodating cavity and one speed reducer accommodating cavity can be adaptively adjusted according to the different heat dissipation requirements of one motor and the lubrication requirements of one speed reducer, so as to ensure the heat dissipation effect of the cooling liquid on the stator and the rotor of one motor while improving the lubrication effect of the cooling liquid on one speed reducer.

[0020] One implementation, the housing of the power assembly further comprises one generator accommodating cavity for accommodating the stator and the rotor of one generator, and one or the rest of the plurality of flow channel outlets are used to deliver the cooling liquid to one generator accommodating cavity, wherein, along the direction of the flow of the cooling liquid, the flow distance of the cooling liquid from one flow channel inlet to the two flow channel outlets is smaller than the flow distance of the cooling liquid from one flow channel inlet to one or the rest of the plurality of flow channel outlets.

[0021] Correspondingly, one or more of the flow channel outlets is communicated to one generator accommodating cavity, so that one transmission flow channel can deliver cooling liquid to one generator accommodating cavity to dissipate heat from the stator and rotor of one generator in one generator accommodating cavity. Meanwhile, one flow channel inlet delivers cooling liquid to one or more of the flow channel outlets through the same transmission flow channel, without the need to separately arrange a transmission flow channel to deliver cooling liquid to one generator accommodating cavity, so as to simplify the internal structure of the power assembly. In the direction of the flow of the cooling liquid, the cooling liquid is first delivered to one motor side and then to one engine side. That is, the cooling liquid is first delivered to one motor accommodating cavity and one reducer accommodating cavity and then to one generator accommodating cavity. According to the different needs of one motor, one reducer and one generator for cooling liquid, the order of delivery of the cooling liquid to one motor accommodating cavity, one reducer accommodating cavity and one generator accommodating cavity is adaptively adjusted, so as to improve the heat dissipation or lubrication efficiency of the cooling liquid on the functional structures in the power assembly.

[0022] In one implementation, one valve is used to reduce the flow of cooling liquid flowing into one flow channel inlet through one direct connection flow channel and increase the flow of cooling liquid flowing into one flow channel inlet from one heat exchanger, and increase the flow of cooling liquid flowing into one flow channel inlet through one direct connection flow channel and reduce the flow of cooling liquid flowing into one flow channel inlet from one heat exchanger, when the rotational speed of one oil pump remains unchanged.

[0023] Correspondingly, the rotational speed of one oil pump remains unchanged, i.e., the flow of cooling liquid output from the outlet of one oil pump is fixed, so that one valve synchronously adjusts the flow of cooling liquid in one heat exchanger and one direct connection flow channel when adjusting the opening degree of one valve. Specifically, one valve is used to reduce the flow of cooling liquid in one heat exchanger while increasing the flow of cooling liquid in one direct connection flow channel. Or, one valve is used to increase the flow of cooling liquid in one heat exchanger while reducing the flow of cooling liquid in one direct connection flow channel. It can be understood that one valve adjusts the increase of the flow of cooling liquid in one heat exchanger, which can reduce the temperature of the cooling liquid. One valve adjusts the increase of the flow of cooling liquid in one direct connection flow channel, which can increase the temperature of the cooling liquid. By one valve adjusting the flow of cooling liquid in one heat exchanger and one direct connection flow channel when the rotational speed of one oil pump remains unchanged, the function of adjusting the temperature of the cooling liquid delivered into one flow channel inlet can be realized, and then the temperature of the cooling liquid in the power assembly is adjusted, so that the cooling liquid works in an appropriate temperature state to improve the working performance of the cooling liquid.

[0024] One valve adjusts the opening degree of one valve, wherein the opening degree of one valve is increased, and the flow of cooling liquid flowing into the inlet of one flow channel from one heat exchanger is reduced, and the flow of cooling liquid flowing into the inlet of one flow channel from one direct connection flow channel is increased, and the opening degree of one valve is decreased, and the flow of cooling liquid flowing into the inlet of one flow channel from one heat exchanger is increased, and the flow of cooling liquid flowing into the inlet of one flow channel from one direct connection flow channel is reduced.

[0025] Correspondingly, the opening degree of one valve is increased, and the flow of cooling liquid flowing into the inlet of one flow channel from one heat exchanger is reduced, and the flow of cooling liquid flowing into the inlet of one flow channel from one direct connection flow channel is increased. By reducing the heat exchange of cooling liquid in one heat exchanger, and directly conveying cooling liquid to the inlet of one flow channel through one direct connection flow channel, the temperature of cooling liquid conveyed in one transmission flow channel can be increased, and the effect of increasing the temperature of cooling liquid can be realized. While improving the flow effect of cooling liquid in the transmission flow channel, the lubrication effect of cooling liquid on the transmission structure in the power assembly can also be improved, and the oil stirring loss of cooling liquid in the transmission mechanism can be reduced. At the same time, the opening degree of one valve is decreased, and the flow of cooling liquid flowing into the inlet of one flow channel from one heat exchanger is increased, and the flow of cooling liquid flowing into the inlet of one flow channel from one direct connection flow channel is reduced. By increasing the heat exchange of cooling liquid in one heat exchanger, and reducing the flow of cooling liquid directly conveyed to the inlet of one flow channel through one direct connection flow channel, the temperature of cooling liquid conveyed in one transmission flow channel can be reduced, and the effect of reducing the temperature of cooling liquid can be realized. Reducing the temperature of cooling liquid can improve the heat dissipation effect of cooling liquid on the functional structure with high heat generation in the power assembly.

[0026] One valve is used to adjust the opening degree of one valve according to at least one of the temperature of cooling liquid in the motor accommodating cavity and the temperature of cooling liquid in the reducer accommodating cavity, wherein when the temperature of cooling liquid in the reducer accommodating cavity is less than a first preset temperature value, one valve adjusts the opening degree of one valve to be greater than a first opening degree, when the temperature of cooling liquid in the motor accommodating cavity is greater than a second preset temperature value, one valve adjusts the opening degree of one valve to be less than a second opening degree, and the second opening degree is less than the first opening degree, when the temperature of at least one of the stator or the rotor of one motor is greater than a third preset temperature value, the third preset temperature value is greater than the second preset temperature value, and one oil pump conveys cooling liquid into one heat exchanger through one valve adjusting the opening degree of one valve to be a third opening degree, and the third opening degree is less than the second opening degree.

[0027] Correspondingly, when the temperature of the cooling liquid in the reducer accommodating cavity is too low, a valve can increase the flow of the cooling liquid directly conveyed to the inlet of the flow channel through the straight connection flow channel and reduce the cooling liquid in the heat exchanger for heat exchange by increasing the opening degree of the valve, so as to increase the temperature of the cooling liquid, thereby improving the lubricating effect of the cooling liquid and reducing the oil stirring loss of the cooling liquid in the reducer. When the heat generated by at least one of the stator and the rotor of the motor is high, causing the temperature of the cooling liquid in the motor accommodating cavity to be too high, a valve can increase the cooling liquid in the heat exchanger for heat exchange and reduce the cooling liquid directly conveyed from the straight connection flow channel to the inlet of the flow channel, thereby quickly reducing the temperature of the cooling liquid. After the cooling liquid with reduced temperature is conveyed to the motor accommodating cavity through the transmission flow channel, the heat dissipation effect of the rotor and the stator of the motor is improved, thereby improving the working performance and service life of the rotor and the stator of the motor. At the same time, when the temperature of the cooling liquid in the motor accommodating cavity is too high, further reducing the opening degree of the valve through the valve can increase the cooling liquid input into the heat exchanger for heat exchange, so as to further improve the cooling efficiency of the cooling liquid and further reduce the temperature of the cooling liquid.

[0028] In an implementation, the power assembly further comprises at least one filter, and the cooling liquid output from the outlet of the oil pump flows through the at least one filter before being conveyed to the inlet of the flow channel through the straight connection flow channel and the heat exchanger.

[0029] Correspondingly, the at least one filter is used to filter impurities or foreign matters that may be mixed into the cooling liquid to improve the cleanliness of the cooling liquid. By adding the at least one filter between the outlet of the oil pump and the inlet of the flow channel along the flow direction of the cooling liquid, the cooling liquid output from the outlet of the oil pump is filtered by the at least one filter before being conveyed to the inlet of the flow channel, so that dust, abrasive particles and other impurities or foreign matters that may be mixed into the cooling liquid are filtered to improve the cleanliness of the cooling liquid, which can ensure that the impurities or foreign matters that may be mixed into the cooling liquid do not damage the transmission mechanism of the generator side or the motor side when the cooling liquid lubricates the generator side or the motor side, thereby reducing the working performance or transmission efficiency of the transmission mechanism. That is, the cooling liquid output from the oil pump flows through the at least one filter before being conveyed to the engine side or the motor side for lubrication or heat dissipation, which can further improve the working performance and service life of the power assembly.

[0030] In a second aspect, the application further provides an electric vehicle, which comprises a power battery, wheels and the power assembly provided by any one of the implementation manners, and the power battery is used to provide power to the motor of the power assembly and drive the wheels through the motor.

[0031] The electric vehicle provided in the application provides electric energy to an electric motor through a power battery, so that an electric motor rotates and can output power externally. The electric motor of the power assembly transmits power to the wheels through a speed reducer, which can realize the effect of driving the wheels to rotate and driving the electric vehicle to run. The electric vehicle provided in the application is equipped with the power assembly in any of the implementation manners, which can improve the working performance and service life of the electric vehicle provided in the application. That is, because the power assembly in any of the implementation manners is used, the electric vehicle provided in the application has all the beneficial effects that the power assembly provided in any of the implementation manners can have. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0033] Fig. 1 is a working scene schematic diagram of an electric vehicle provided in an embodiment of the application;

[0034] Fig. 2 is a plane structure schematic diagram of a power assembly of an electric vehicle provided in an embodiment of the application;

[0035] Fig. 3 is a plane structure schematic diagram of a transmission flow channel conveying cooling liquid of a power assembly provided in an embodiment of the application;

[0036] Fig. 4 is a plane structure schematic diagram of a direct connection flow channel conveying cooling liquid of a power assembly provided in an embodiment of the application;

[0037] Fig. 5 is a working principle schematic diagram of a valve of a power assembly provided in an embodiment of the application;

[0038] Fig. 6 is a partial plane result schematic diagram of a power assembly provided in an embodiment of the application after a hidden part structure is removed;

[0039] Fig. 7 is a partial plane result schematic diagram of a power assembly provided in an embodiment of the application;

[0040] Fig. 8 is a partial plane result schematic diagram of a power assembly provided in an embodiment of the application;

[0041] Fig. 9 is a working principle schematic diagram of a valve of a power assembly provided in an embodiment of the application;

[0042] Fig. 10 is a partial plane result schematic diagram of an electric vehicle provided in an embodiment of the application;

[0043] Fig. 11 is a partial plane structure schematic diagram of a direct connection flow channel and a heat exchanger of a power assembly provided in an embodiment of the application;

[0044] Fig. 12 is a schematic diagram of a planar structure of a transmission flow channel of a power assembly for conveying cooling liquid according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0046] The present application provides a power assembly with a direct connection flow channel. The housing of the power assembly includes a motor accommodating cavity, a reducer accommodating cavity, a flow channel inlet, and a plurality of flow channel outlets. The motor accommodating cavity is configured to accommodate a stator and a rotor of a motor. The reducer accommodating cavity is configured to accommodate a gear and a bearing of a reducer. The flow channel inlet is configured to convey cooling liquid to the plurality of flow channel outlets through a same transmission flow channel. Two flow channel outlets of the plurality of flow channel outlets are configured to convey cooling liquid to the motor accommodating cavity and the reducer accommodating cavity, respectively. An outlet of an oil pump is configured to convey cooling liquid to the flow channel inlet through a heat exchanger and a direct connection flow channel, respectively. A valve is configured to adjust the flow of cooling liquid conveyed to the flow channel inlet from at least one of the heat exchanger and the direct connection flow channel. The power assembly of the present application can adaptively adjust the working temperature of the cooling liquid according to different working conditions of the power assembly by optimizing the structure design of the flow channel inside the power assembly, thereby improving the working performance and the service life of the power assembly.

[0047] The present application provides an electric vehicle. The electric vehicle includes a power battery, a wheel, and a power assembly provided by the above-mentioned implementation. The power battery is configured to provide kinetic energy to a motor of the power assembly and drive the wheel through the motor. The power assembly of the electric vehicle of the present application can adaptively adjust the working temperature of the cooling liquid according to different working conditions of the power assembly by adjusting the distribution of the flow of the cooling liquid in a heat exchanger and a direct connection flow channel, thereby improving the overall working performance and the service life of the electric vehicle.

[0048] Please refer to Fig. 1 and Fig. 2, Fig. 1 is a working scene schematic diagram of an electric vehicle 1000 provided by an embodiment of the present application, and Fig. 2 is a plane structure schematic diagram of a power assembly 100 of the electric vehicle 1000 provided by an embodiment of the present application. The electric vehicle 1000 comprises wheels 1001, a power battery 1002 and the power assembly 100. The power battery 1002 is electrically connected with each functional structural member inside the electric vehicle 1000, and the power battery 1002 can supply power for the normal work of each functional structural member inside the electric vehicle 1000. The power assembly 100 is used for receiving the electric energy provided by the power battery 1002 and is used for providing power to drive the wheels 1001 of the electric vehicle 1000.

[0049] In the embodiment shown in Fig. 1 and Fig. 2, the wheels 1001 are rotationally connected to the vehicle body of the electric vehicle 1000, and each wheel 1001 rotates to drive the frame of the electric vehicle 1000 to travel. The power assembly 100 is fixedly connected to the vehicle body of the electric vehicle 1000 and is in transmission connection with the wheels 1001 of the electric vehicle 1000. The power battery 1002 supplies power to the power assembly 100, and the power assembly 100 outputs power to the wheel end to drive the wheels 1001 to rotate.

[0050] It can be understood that the power assembly 100 of the electric vehicle 1000 is in transmission connection with the wheels 1001 through a speed reducer, so that the power output by the electric motor in the power assembly 100 is transmitted to the speed reducer and then transmitted to the wheels 1001 through the speed reducer, so as to achieve the effect of driving the wheels 1001 to rotate and then driving the electric vehicle 1000 to travel.

[0051] For example, the power assembly 100 comprises at least one of a speed reducer 101, a generator 102 and an electric motor 103. In the embodiment shown in Fig. 1 and Fig. 2, the power assembly 100 comprises the speed reducer 101, the generator 102 and the electric motor 103.

[0052] In one embodiment, the electric motor 103 and the speed reducer 101 are in transmission connection. The electric motor 103 is used for generating driving torque and serving as a power source of the power assembly 100 to output power, and the electric motor 103 transmits the output power to the wheels 1001 through the speed reducer 101 to drive the electric vehicle 1000 to travel. Specifically, the electric motor 103 comprises a stator 1031, a rotor 1032 and a motor shaft 1033, the stator 1031 is coaxially sleeved on the periphery of the rotor 1032 and is fixed relative to the shell of the electric motor 103, the motor shaft 1033 of the electric motor 103 is coaxially fixed to the rotor 1032, the rotor 1032 rotates around its own axis and synchronously drives the motor shaft 1033 to rotate to output power through the motor shaft 1033.

[0053] In one embodiment, the speed reducer 101 comprises a plurality of gears 1011 and a plurality of rotating shafts 1012, which are parallel and spaced apart. The plurality of gears 1011 are configured to transmit power between the plurality of rotating shafts 1012, so as to transmit the power input by the motor 103 to the wheels 1001.

[0054] It should be noted that in the embodiments shown in FIG. 1 and FIG. 2, a transmission mechanism for achieving other functions can be further provided between the speed reducer 101 and the wheels 1001 of the electric vehicle 1000, such as but not limited to a differential mechanism, so as to achieve different power transmission effects between the speed reducer 101 and the wheels 1001, so as to meet different driving states and requirements of the electric vehicle 1000.

[0055] In one embodiment, the motor 103 and the generator 102 are electrically connected to the power battery 1002. For example, the generator 102 is configured to convert kinetic energy into electrical energy. The electrical energy generated by the generator 102 is stored in the power battery 1002, so as to achieve the effect of charging the power battery 1002 by the generator 102. The power battery 1002 is configured to transmit electrical energy to the motor 103, and convert the electrical energy into kinetic energy by the motor 103. The motor 103 transmits the kinetic energy to the wheels 1001 through the speed reducer 101.

[0056] In one embodiment, the electric vehicle 1000 further comprises an engine 1003, which is in transmission connection with the generator 102. The engine 1003 is configured to provide power and transmit the power to the generator 102 through the transmission mechanism between the engine 1003 and the generator 102, so as to convert the kinetic energy into electrical energy by the generator 102. In the embodiments shown in FIG. 1 and FIG. 2, the engine 1003 can but not limited to include a gasoline engine, a diesel engine, and other types or fuels of engines.

[0057] In one embodiment, the electric vehicle 1000 further comprises a controller 1004, which is electrically connected to the power battery 1002, the motor 103 and the generator 102, respectively. The controller 1004 is configured to control the cooperation between the power battery 1002, the motor 103 and the generator 102, so as to enable the electric vehicle 1000 to drive normally and work in different power modes.

[0058] It can be understood that, in the power assembly 100 provided in the embodiments of the present application, the power assembly 100 is used to provide electric energy to the power battery 1002 of the electric vehicle 1000 through the generator 102, and the motor shaft 1033 of the electric motor 103 is driven to rotate through the power battery 1002 so as to be able to input power to the transmission mechanism which is in transmission connection with the electric motor 103 in the power assembly 100. The power output by the electric motor 103 is output to the outside of the power assembly through the transmission mechanism which is in transmission connection with the electric motor 103 in the power assembly 100, thereby achieving the effect of outputting power from the power assembly 100 to the outside, and being used to realize the function of driving the electric vehicle 1000 to travel.

[0059] It should be noted that, in the embodiments shown in FIGS. 1 and 2, only a possible functional structure and a possible structure shape, size and arrangement position of each functional structure in the electric vehicle 1000 and the power assembly 100 provided in the embodiments of the present application are exemplarily introduced, but the functional structure and the structure shape, size and arrangement position of each functional structure in the electric vehicle 1000 provided in the embodiments of the present application are not limited to this, and the functional structure and the structure shape, size and arrangement position of each functional structure in the power assembly 100 provided in the embodiments of the present application are not limited to this. In other embodiments of the present application, the functional structure and the structure shape, size and arrangement position of each functional structure in the electric vehicle 1000 and the power assembly 100 can be adjusted according to actual design requirements and application scenarios, which are not specifically limited in the embodiments of the present application.

[0060] Please refer to FIG. 3, which is a planar structure schematic diagram of the transmission flow channel 20 of the power assembly 100 provided in the embodiments of the present application for conveying cooling liquid. The housing 10 of the power assembly 100 includes an electric motor accommodating cavity 11, a speed reducer accommodating cavity 12 and a generator accommodating cavity 13. The electric motor accommodating cavity 11 is used to accommodate the stator and the rotor of the electric motor 103, the generator accommodating cavity 13 is used to accommodate the stator and the rotor of the generator 102, and the speed reducer accommodating cavity 12 is used to accommodate the gear and the bearing of the speed reducer 101.

[0061] It can be understood that the housing 10 is integrated with the electric motor accommodating cavity 11, the speed reducer accommodating cavity 12 and the generator accommodating cavity 13, and can accommodate the electric motor 103, the speed reducer 101 and the generator 102 of the power assembly 100 at the same time, so that the electric motor 103, the speed reducer 101 and the generator 102 can be integrated to simplify the internal structure design of the power assembly 100 and realize the miniaturization of the power assembly 100. At the same time, the electric motor 103, the speed reducer 101 and the generator 102 are respectively accommodated by one cavity of the housing 10, and are spaced from each other to ensure the normal work between the functional structures in the power assembly 100 and improve the overall working performance and service life of the power assembly 100.

[0062] In the embodiment shown in FIG. 3, the power assembly 100 further comprises a transmission flow channel 20 for conveying the coolant. An opening 20a at one end of the transmission flow channel 20 is configured to input the coolant, and a plurality of openings 20b at the other end of the transmission flow channel 20 are configured to output the coolant, respectively. The transmission flow channel 20 can be integrated in the interior of the housing 10, or can be disposed outside the housing 10, but is not limited thereto.

[0063] It can be understood that the transmission flow channel 20 is connected between a plurality of functional structures in the power assembly 100, for conveying the coolant to lubricate or dissipate heat of each functional structure (as shown by the solid line in FIG. 3), so as to ensure the working performance and service life of each functional structure.

[0064] The housing 10 comprises one flow channel inlet 14 and a plurality of flow channel outlets 15, which are both configured on the housing 10. The one flow channel inlet 14 is configured to convey the coolant to the plurality of flow channel outlets 15 through the transmission flow channel 20.

[0065] Specifically, the one flow channel inlet 14 can be configured as the opening 20a at one end of the transmission flow channel 20, or the one flow channel inlet 14 can be configured to communicate with the opening 20a at one end of the transmission flow channel 20 and to convey the coolant to the transmission flow channel 20. Each of the plurality of flow channel outlets 15 can be configured as one of the plurality of openings 20b at the other end of the transmission flow channel 20, or each of the plurality of flow channel outlets 15 can be configured to communicate with one of the openings 20b at the other end of the transmission flow channel 20 and to convey the coolant to the one of the openings 20b.

[0066] As shown in FIG. 3, two of the plurality of flow channel outlets 15, one flow channel outlet 151 communicates with the motor accommodating cavity 11, and the one flow channel outlet 151 is configured to convey the coolant to the motor accommodating cavity 11. Another flow channel outlet 152 communicates with the speed reducer accommodating cavity 12, and the another flow channel outlet 152 is configured to convey the coolant to the speed reducer accommodating cavity 12. One or the rest of the plurality of flow channel outlets 153 are configured to convey the coolant to the generator accommodating cavity 13. In the embodiment shown in FIG. 3, the flow channel outlet 15 configured to convey the coolant to the motor accommodating cavity 11 is the first flow channel outlet 151, the flow channel outlet 15 configured to convey the coolant to the speed reducer accommodating cavity 12 is the second flow channel outlet 152, and the flow channel outlet 15 configured to convey the coolant to the generator accommodating cavity 13 is the third flow channel outlet 153.

[0067] It can be understood that the shell 10 is provided with a flow passage inlet 14 and a plurality of flow passage outlets 15, and the flow passage inlet 14 and the plurality of flow passage outlets 15 are communicated through the transmission flow passage 20, so that the external oil liquid can be transported from the flow passage inlet 14 to the transmission flow passage 20, and the cooling liquid in the transmission flow passage 20 is output through each flow passage outlet 15. Among them, two flow passage outlets 15 in the plurality of flow passage outlets 15 are respectively arranged on the inner wall of the motor accommodating cavity 11 and the inner wall of the speed reducer accommodating cavity 12, so that the transmission flow passage 20 can respectively transport the cooling liquid to the motor accommodating cavity 11 and the speed reducer accommodating cavity 12 through the two flow passage outlets 15, thereby being able to transport the cooling liquid to cool the stator and rotor of the motor 103 and lubricate at least one of the gear and bearing in the speed reducer 101, and improve the working performance and service life of the power assembly 100.

[0068] At the same time, one or the rest of the plurality of flow passage outlets 153 are communicated to the generator accommodating cavity 13, so that the transmission flow passage 20 can transport the cooling liquid to the generator accommodating cavity 13 to cool the stator and rotor of the generator 102 in the generator accommodating cavity 13. At the same time, one flow passage inlet 14 transports the cooling liquid to one or the rest of the plurality of flow passage outlets 153 through the transmission flow passage 20, without the need to separately arrange the transmission flow passage 20 to transport the cooling liquid to the generator accommodating cavity 13, which can simplify the internal structure of the power assembly 100.

[0069] It should be noted that in the embodiment shown in FIG. 3, only the number of the first flow passage outlet 151, the number of the second flow passage outlet 152, and the number of the third flow passage outlet 153 in the plurality of flow passage outlets 15 are taken as one, one, and one or the rest of the plurality of flow passage outlets 153 are taken as examples for illustrative introduction. Among them, the number of the first flow passage outlet 151, the second flow passage outlet 152 and the third flow passage outlet 153 can be adjusted according to the actual structure design of the transmission flow passage 20 and the shell 10, and the embodiment of the application does not make specific limitation.

[0070] In one embodiment, the material of the cooling liquid can include but is not limited to water, methanol, ethanol, ethylene glycol, glycerol or other liquid medium, so as to be used for heat exchange cooling of the cooling oil with more heat during operation of the electric vehicle.

[0071] In one embodiment, the material of the cooling liquid can also include but is not limited to ethylene glycol cooling oil, synthetic oil and mineral oil.

[0072] One embodiment, the power assembly 100 further comprises an oil pump 104. As shown in FIG. 3, the oil pump 104 is configured to provide negative pressure and to draw the coolant from the oil pool 16, and the coolant outputted from the oil pump 104 is delivered to each functional structure via the transmission flow channel 20 for lubrication or heat dissipation. The oil pool 16 can be understood as a part of the housing 10 or a cavity structure surrounded by the inner wall of the housing 10, which is configured to accommodate the coolant (as shown by the dotted line in FIG. 3) delivered to each functional structure of the power assembly 100 via the transmission flow channel 20 for lubrication or heat dissipation, i.e., the coolant after completing the lubrication or heat dissipation in the power assembly 100 is accommodated in the oil pool 16 of the housing 10.

[0073] Specifically, the inlet of the oil pump 104 is in communication with the oil pool 16 of the housing 10, and the outlet of the oil pump 104 is configured to deliver the coolant drawn from the oil pool 16 to the motor accommodating cavity 11, the generator accommodating cavity 13 and the reducer accommodating cavity 12 via the transmission flow channel 20, respectively.

[0074] One embodiment, the power assembly 100 further comprises a heat exchanger 30 and at least one filter 105. In the embodiment shown in FIG. 3, the coolant outputted from the outlet of the oil pump 104 flows through the at least one filter 105 before being delivered to one flow channel inlet 14.

[0075] As shown in FIG. 3, the heat exchanger 30 and the at least one filter 105 are arranged between the oil pump 104 and one flow channel inlet 14 in the direction of the coolant flow, the heat exchanger 30 is configured to exchange heat with the coolant to reduce the temperature of the coolant and output the coolant, and the at least one filter 105 is configured to filter impurities or foreign matters that can be mixed into the coolant to improve the cleanliness of the coolant.

[0076] It can be understood that, by arranging the heat exchanger 30 on the outlet side of the oil pump 104 in the direction of the coolant flow, the coolant outputted from the outlet of the oil pump 104 is exchanged with the heat exchanger 30 to reduce the temperature of the coolant before being used for lubrication or heat dissipation of the motor side and the generator side, which can ensure the heat dissipation efficiency of the coolant for the generator side or the motor side, and further ensure that the generator 102 or the motor 103 operates at an appropriate temperature to further improve the working performance and service life of the generator 102 or the motor 103.

[0077] Meanwhile, at least one filter 105 is used to filter impurities or foreign matters that can be mixed into the coolant to improve the cleanliness of the coolant. By adding at least one filter 105 between the outlet of the oil pump 104 and one flow passage inlet 14 along the direction of the coolant flow, the coolant output from the outlet of the oil pump 104 is filtered by the at least one filter 105 before being delivered to one flow passage inlet 14 to filter impurities or foreign matters such as dust and abrasive particles that can be mixed into the coolant to improve the cleanliness of the coolant, so that the impurities or foreign matters that can be mixed into the coolant can be prevented from damaging the transmission mechanism of the generator side or the motor side to reduce the working performance or transmission efficiency of the transmission mechanism when the coolant lubricates the generator side or the motor side. That is, the coolant output from the oil pump 104 is further flowed through the at least one filter 105 before being delivered to the engine side or the motor side for lubrication or heat dissipation, so that the working performance and the service life of the power assembly 100 can be further improved.

[0078] In one embodiment, the at least one filter 105 includes two filters 105, one filter 105 having a filter screen with a smaller pore size than the other filter 105.

[0079] In one embodiment, the coolant flowing into one flow passage inlet 14 flows through one filter 105. The coolant sucked by the inlet of the oil pump 104 flows into the inlet of the oil pump 104 after flowing through the other filter 105 before flowing into the inlet of the oil pump 104. In the embodiment shown in FIG. 3, the filter 105 with the relatively smaller pore size of the filter screen is referred to as the first filter 1051, and the filter 105 with the relatively larger pore size of the filter screen is referred to as the second filter 1052.

[0080] Specifically, along the direction of the coolant flow, the filter 105 with the relatively larger pore size of the filter screen is arranged on the side of the inlet of the oil pump 104 away from the outlet of the oil pump 104, and the filter 105 with the relatively smaller pore size of the filter screen is arranged on the side of the outlet of the oil pump 104 away from the inlet of the oil pump 104, so that the coolant flows through the filter 105 with the relatively larger pore size of the filter screen before flowing into the oil pump 104. As shown in FIG. 3, along the direction of the coolant flow, the coolant flowing from the oil sump 16 of the housing 10 to the plurality of functional structural members of the power assembly 100 flows through the second filter 1052, the oil pump 104, the heat exchanger 30, and the first filter 1051 in sequence.

[0081] It can be understood that the other filter 105 with the relatively larger filter screen aperture can filter the impurities or foreign matters with relatively larger size, such as volume and outer diameter, which may be mixed into the cooling liquid, so as to achieve the effect of rough filtration of the other filter 105 and avoid the damage of the impurities or foreign matters with relatively larger size, such as volume and outer diameter, which may be mixed into the other filter 105 to the oil pump 104. That is, the other filter 105 with the relatively larger filter screen aperture can form a protection effect on the oil pump 104, so as to improve the working performance and service life of the oil pump 104.

[0082] Meanwhile, the filter screens of the two filters 105 have different apertures, so that the two filters 105 form complementation and cooperation when filtering the cooling liquid, so as to further improve the filtering effect on the cooling liquid.

[0083] It should be noted that in the embodiment shown in FIG. 3, only a possible arrangement position, relative position relationship, etc. of each functional structural member in the power assembly 100 of the present application is exemplarily introduced, but the arrangement position, relative position relationship, communication mode, structure shape and size, etc. of each functional structural member provided in the embodiment of the present application are not limited to this. In other embodiments provided in the present application, the arrangement position, relative position relationship, communication mode, structure shape and size, etc. of each functional structural member in the power assembly 100 can be adjusted according to actual design requirements, which is not specifically limited in the present application.

[0084] Please refer to FIG. 4, which is a planar structure schematic diagram of the direct connection flow channel 40 of the power assembly 100 for conveying the cooling liquid according to the embodiment of the present application. In the embodiment shown in FIG. 4, the power assembly 100 comprises the direct connection flow channel 40 and the valve 50, and the outlet of the oil pump 104 is used to convey the cooling liquid to one flow channel inlet 14 through the heat exchanger 30 and the direct connection flow channel 40 respectively, and the valve 50 is used to adjust the flow of the cooling liquid conveyed by at least one of the heat exchanger 30 and the direct connection flow channel 40 to the one flow channel inlet 14.

[0085] As shown in FIG. 4, the direct connection flow channel 40 comprises a direct connection flow channel inlet 41 and a direct connection flow channel outlet 42, and the direct connection flow channel inlet 41 is used to receive the cooling liquid and convey the cooling liquid to the direct connection flow channel outlet 42. Among them, the direct connection flow channel inlet 41 is used to convey the cooling liquid to the direct connection flow channel outlet 42 through the valve 50.

[0086] It can be understood that the direct connection flow channel 40 is arranged on one side of the heat exchanger 30, and the valve 50 is connected in series with the direct connection flow channel 40 and located on one side of the heat exchanger 30, thereby achieving the adjustment of the flow of the cooling liquid delivered to the heat exchanger 30 and the direct connection flow channel 40 through the valve 50, reducing the structural size of the housing along the direction in which the cooling liquid is output from the outlet of the oil pump 104, and arranging the valve 50 in the space of the housing by using the direct connection flow channel 40 to reduce the structural size of the housing along the direction in which the heat exchanger 30 and the direct connection flow channel 40 are arranged. That is, by arranging the valve 50 in series with the direct connection flow channel 40, the internal structure design of the housing and the overall structural size can be simplified, and the overall miniaturization design of the power assembly 100 can be achieved.

[0087] For example, the outlet of the oil pump 104 is used to deliver the cooling liquid to one inlet of the heat exchanger 30 and the direct connection flow channel inlet 41, respectively, and the outlet of the heat exchanger 30 and the direct connection flow channel outlet 42 are used to deliver the cooling liquid to one flow channel inlet 14 at the same time.

[0088] It can be understood that the outlet of the oil pump 104 is in communication with one inlet of the heat exchanger 30 and the direct connection flow channel inlet 41 at the same time, and one flow channel inlet 14 is in communication with the outlet of the heat exchanger 30 and the direct connection flow channel outlet 42, so that the direct connection flow channel 40 is formed in parallel with the heat exchanger 30. When the valve 50 adjusts the opening degree of the valve 50, the flow of the cooling liquid delivered to one inlet of the heat exchanger 30 and the direct connection flow channel inlet 41 can be adjusted synchronously, thereby achieving the effect of dynamically adjusting the temperature of the cooling liquid in the transmission flow channel 20.

[0089] At the same time, the heat exchanger 30 and the direct connection flow channel 40 are arranged in parallel, and only the valve 50 needs to be arranged to simultaneously adjust the flow of the cooling liquid of one inlet of the heat exchanger 30 and the direct connection flow channel inlet 41 in parallel, thereby achieving the simplified design of the internal structure of the power assembly 100.

[0090] Generally, the working temperature of the cooling liquid in the power assembly is difficult to adaptively adjust according to different working conditions of the power assembly, thereby reducing the working performance and service life of the power assembly.

[0091] The outlet of the oil pump 104 of the power assembly 100 of the present application outputs the cooling liquid to the heat exchanger 30 and the direct connection flow channel 40, respectively, and the cooling liquid output from the heat exchanger 30 and the direct connection flow channel 40 is delivered to one flow channel inlet 14, so that the cooling liquid output from the heat exchanger 30 and the direct connection flow channel 40 can be delivered to the motor accommodating cavity 11 and the speed reducer accommodating cavity 12 through the transmission flow channel. Among them, the cooling liquid of the outlet of the oil pump 104 can be delivered to the heat exchanger 30 and the direct connection flow channel 40, respectively, and the cooling liquid output from the heat exchanger 30 and the direct connection flow channel 40 can be delivered to the same transmission flow channel 20 from one flow channel inlet 14.

[0092] Since the heat exchanger 30 can exchange heat with the cooling liquid to reduce the temperature of the cooling liquid, by adjusting the flow of the cooling liquid respectively transported by the heat exchanger 30 and the direct flow channel 40 into one flow channel inlet 14 through the valve 50, the temperature of the cooling liquid respectively transported by the heat exchanger 30 and the direct flow channel 40 into one flow channel inlet 14 can be adjusted.

[0093] It can be understood that the valve 50 can adjust the flow of the cooling liquid respectively transported into the heat exchanger 30 and the direct flow channel 40 according to different working conditions of the power assembly 100, so as to realize dynamic adjustment of the temperature of the cooling liquid, thereby ensuring that the cooling liquid can effectively cool the stator and rotor of the motor 103 and effectively lubricate the gear and bearing of the reducer 101 when the power assembly 100 works in different working conditions, improving the adaptability of the power assembly 100 to different working conditions, and further improving the working performance and service life of the power assembly 100. At the same time, the direct flow channel 40, the heat exchanger 30 and the valve 50 cooperate to work, which can realize dynamic adjustment of the temperature of the cooling liquid transported into the transmission flow channel, and can realize reuse of the internal structure of the shell to simplify the structural design of the shell.

[0094] The electric vehicle 1000 of the present application is equipped with the power assembly 100 in any of the above-mentioned implementation manners, which can improve the working performance and service life of the electric vehicle 1000 of the present application. That is, because the power assembly 100 in any of the above-mentioned implementation manners is used, the electric vehicle 1000 of the present application has all the beneficial effects that the power assembly 100 in any of the above-mentioned implementation manners can have.

[0095] In one embodiment, the valve 50 is used to reduce the flow of the cooling liquid flowing into one flow channel inlet 14 through the direct flow channel 40 and increase the flow of the cooling liquid flowing into one flow channel inlet 14 through the heat exchanger 30 under the condition that the rotating speed of the oil pump 104 remains unchanged.

[0096] In one embodiment, the valve 50 is used to increase the flow of the cooling liquid flowing into one flow channel inlet 14 through the direct flow channel 40 and reduce the flow of the cooling liquid flowing into one flow channel inlet 14 through the heat exchanger 30 under the condition that the rotating speed of the oil pump 104 remains unchanged.

[0097] That is, the rotating speed of the oil pump 104 remains unchanged, that is, the flow of the cooling liquid output by the outlet of the oil pump 104 is fixed, so that the valve 50 synchronously adjusts the flow of the cooling liquid in the heat exchanger 30 and the direct flow channel 40 when adjusting the opening degree of the valve 50. Specifically, the valve 50 is used to increase the flow of the cooling liquid in the direct flow channel 40 while reducing the flow of the cooling liquid in the heat exchanger 30. Or, the valve 50 is used to reduce the flow of the cooling liquid in the direct flow channel 40 while increasing the flow of the cooling liquid in the heat exchanger 30.

[0098] It can be understood that the valve 50 adjusts the flow of the coolant in the heat exchanger 30 to increase the temperature of the coolant. The valve 50 adjusts the flow of the coolant in the direct flow channel 40 to increase the temperature of the coolant. By adjusting the flow of the coolant in the heat exchanger 30 and the direct flow channel 40 at a constant speed of the oil pump 104, the temperature of the coolant delivered to the inlet 14 of the flow channel can be adjusted, and the temperature of the coolant in the power assembly 100 can be adjusted to improve the working performance of the coolant at an appropriate temperature.

[0099] In one embodiment, the valve 50 adjusts the opening degree of the valve 50. In this case, the opening degree of the valve 50 is increased, and the flow of the coolant in the heat exchanger 30 to the inlet 14 of the flow channel is reduced, and the flow of the coolant in the direct flow channel 40 to the inlet 14 of the flow channel is increased.

[0100] It can be understood that the opening degree of the valve 50 is increased, and the flow of the coolant in the heat exchanger 30 to the inlet 14 of the flow channel is reduced, and the flow of the coolant in the direct flow channel 40 to the inlet 14 of the flow channel is increased. By reducing the heat exchange of the coolant in the heat exchanger 30 and directly delivering the coolant to the inlet 14 of the flow channel through the direct flow channel 40, the temperature of the coolant delivered in the transmission flow channel 20 can be increased, and the temperature of the coolant can be increased. The effect of the coolant can be achieved. While improving the flow effect of the coolant in the transmission flow channel 20, the lubrication effect of the coolant on the transmission structure in the power assembly 100 can be improved, and the oil stirring loss of the coolant in the transmission mechanism can be reduced.

[0101] In one embodiment, the opening degree of the valve 50 is reduced, and the flow of the coolant in the heat exchanger 30 to the inlet 14 of the flow channel is increased, and the flow of the coolant in the direct flow channel 40 to the inlet 14 of the flow channel is reduced.

[0102] It can be understood that the opening degree of the valve 50 is reduced, and the flow of the coolant in the heat exchanger 30 to the inlet 14 of the flow channel is increased, and the flow of the coolant in the direct flow channel 40 to the inlet 14 of the flow channel is reduced. By increasing the heat exchange of the coolant in the heat exchanger 30 and reducing the flow of the coolant directly delivered to the inlet 14 of the flow channel through the direct flow channel 40, the temperature of the coolant delivered in the transmission flow channel 20 can be reduced, and the temperature of the coolant can be reduced. The effect of the coolant can be achieved. Reducing the temperature of the coolant can improve the heat dissipation effect of the coolant on the functional structure with high heat generation in the power assembly 100.

[0103] Please refer to FIG. 5 and FIG. 6, FIG. 5 is a schematic diagram of the working principle of the valve 50 of the power assembly 100 provided in the embodiment of the present application, and FIG. 6 is a schematic diagram of the partial plane result of the power assembly 100 after the hidden part structure. In order to clearly show the structure that the oil pump 104 respectively delivers the cooling liquid to the heat exchanger 30 and the direct flow channel 40, the functional structural members such as the filter 105 of the power assembly 100 are hidden in the embodiment shown in FIG. 6. In the embodiment shown in FIG. 5 and FIG. 6, the valve 50 is used to adjust the opening degree of the valve 50 according to at least one of the temperature of the cooling liquid in the motor accommodating cavity 11 and the temperature of the cooling liquid in the reducer accommodating cavity 12.

[0104] In an embodiment, when the temperature of the cooling liquid in the reducer accommodating cavity 12 is less than a first preset temperature value, the valve 50 adjusts the opening degree of the valve 50 to be greater than a first opening degree.

[0105] For example, when the external environment is low, the cooling liquid inside the power assembly 100 can be frozen and the viscosity of the cooling liquid increases, that is, the temperature of the cooling liquid is less than the first preset temperature value. The first preset temperature value can be but is not limited to between 0-10℃. When the temperature of the cooling liquid in the reducer accommodating cavity 12 is too low, it can cause the flow resistance of the cooling liquid to increase during the delivery process and the oil stirring loss of the cooling liquid to increase when the reducer 101 is lubricated.

[0106] As shown in FIG. 5 and FIG. 6, when the temperature of the cooling liquid in the reducer accommodating cavity 12 is too low, at this time, but not limited to, the motor 103 works in the locked-rotor heating mode, so that at least one of the stator and the rotor of the motor 103 can heat the cooling liquid in the motor accommodating cavity 11. Heating the cooling liquid by at least one of the stator and the rotor of the motor 103 can increase the temperature of the cooling liquid, thereby reducing the viscosity of the cooling liquid during the delivery process and improving the delivery efficiency of the cooling liquid. Wherein, the motor 103 works in the locked-rotor heating mode, which can be understood as the motor 103 outputs torque when the rotating speed is 0, that is, increases the current input to the motor 103, so that at least one of the stator winding or the rotor winding of the motor 103 generates heat. A large amount of heat generated by the stator winding or the rotor winding of the motor 103 can heat the cooling liquid in the motor accommodating cavity 11, so as to increase the temperature of the cooling liquid in the motor accommodating cavity 11.

[0107] When the heated coolant is output from the outlet of the oil pump 104, the valve 50 is adjusted to have an opening degree greater than the first opening degree, so that the valve 50 adjusts the coolant output from the outlet of the oil pump 104 to be more delivered into the direct flow channel 40 (as shown by the thick solid line in FIG. 6) and less delivered into the heat exchanger 30 (as shown by the thin dashed line in FIG. 6). For example, the valve 50 can be adjusted to have an opening degree of 100% but is not limited thereto, so that the coolant is entirely delivered from the outlet of the oil pump 104 into the direct flow channel 40.

[0108] It can be understood that the coolant with the increased temperature is delivered as much as possible from the direct flow channel 40 into one flow channel inlet 14 and delivered into the reducer accommodating cavity 12 through the other flow channel outlet 152 to lubricate the gears or bearings of the reducer 101, which can reduce the oil stirring loss of the coolant at the transmission mechanism of the power assembly 100, improve the lubrication efficiency of the coolant, and further improve the working performance and service life of the power assembly 100.

[0109] Please refer to FIG. 5 and FIG. 7, which is a partial plan view of the power assembly 100 provided by the embodiment of the present application. When the temperature of the coolant in the motor accommodating cavity 11 is greater than the second preset temperature value, the valve 50 is adjusted to have an opening degree less than the second opening degree, and the second opening degree is less than the first opening degree.

[0110] For example, when the temperature of the coolant in the motor accommodating cavity 11 is too high due to the high heat generated by at least one of the stator and the rotor of the motor 103, i.e., the temperature of the coolant in the motor accommodating cavity 11 is greater than the second preset temperature value. The second preset temperature value can be greater than or equal to 70°C but is not limited thereto. At this time, the valve 50 is adjusted to have an opening degree less than the second opening degree, and the second opening degree is less than the first opening degree.

[0111] It can be understood that the valve 50 is adjusted to have a reduced opening degree, which can increase the flow of the coolant output from the outlet of the oil pump 104 into the heat exchanger 30 (as shown by the thick solid line in FIG. 7) and reduce the flow of the coolant output from the outlet of the oil pump 104 into the direct flow channel 40 (as shown by the thin solid line in FIG. 7). The increased flow of the coolant in the heat exchanger 30 can quickly reduce the temperature of the coolant, so that the overall temperature of the coolant delivered into one flow channel inlet 14 can be reduced. The coolant with the reduced temperature can improve the heat dissipation effect of the rotor and the stator of the motor 103 when delivered into the motor accommodating cavity 11 through the transmission flow channel 20, so as to improve the working performance and service life of the rotor and the stator of the motor 103.

[0112] Please refer to FIG. 5 and FIG. 8, FIG. 8 is a partial plan view of the power assembly 100 provided by the embodiment of the present application. In the embodiment shown in FIG. 5 and FIG. 8, when the temperature of at least one of the stator or the rotor of the electric motor 103 is greater than a third preset temperature value, the third preset temperature value is greater than the second preset temperature value, the oil pump 104 adjusts the opening degree of the valve 50 to the third opening degree and keeps the valve 50 at the third opening degree to deliver the cooling liquid into the heat exchanger 30, and the third opening degree is less than the second opening degree.

[0113] For example, the power assembly 100 further comprises a temperature sensor (not shown in the figure) for monitoring the temperature of at least one of the stator or the rotor of the electric motor 103. When the temperature sensor monitors that the temperature of at least one of the stator or the rotor of the electric motor 103 is greater than the third preset temperature value, the temperature sensor can transmit the temperature value of at least one of the stator or the rotor of the electric motor 103 monitored to a controller 1004, and control the valve 50 to adjust the opening degree of the valve 50 to be less than the third opening degree through the controller 1004. Wherein, the third preset temperature value can be but not limited to greater than or equal to 130℃.

[0114] That is, when the temperature sensor monitors that the temperature of at least one of the stator or the rotor of the electric motor 103 is too high, at this time, in order to ensure the heat dissipation and cooling effect of the cooling liquid on the stator or the rotor of the electric motor 103. The opening degree of the valve 50 can be reduced to further increase the flow of the cooling liquid delivered into the heat exchanger 30 for heat exchange (as shown by the solid line in FIG. 8), and at the same time, further reduce the flow of the cooling liquid directly delivered into a flow channel inlet 14 through the direct connection flow channel 40 (as shown by the dotted line in FIG. 8), which can further improve the cooling efficiency of the cooling liquid.

[0115] For example, the valve 50 can adjust the opening degree of the valve 50 to 0, so that the cooling liquid output by the oil pump 104 is all delivered into the heat exchanger 30 for heat exchange, and then delivered into a flow channel inlet 14 through the outlet of the heat exchanger 30.

[0116] It can be understood that in the embodiment shown in FIG. 5 and FIG. 8, when the temperature of the cooling liquid in the motor accommodating cavity 11 is too high, the opening degree of the valve 50 is further reduced through the valve 50, which can increase the cooling liquid input into the heat exchanger 30 for heat exchange, so as to further improve the cooling efficiency of the cooling liquid and further reduce the temperature of the cooling liquid.

[0117] Please refer to FIG. 9 and FIG. 10 as well, FIG. 9 is a schematic diagram of the working principle of the valve 50 of the power assembly 100 provided in the embodiment of the present application, and FIG. 10 is a schematic diagram of a partial plane view of the electric vehicle 1000 provided in the embodiment of the present application. The electric vehicle 1000 further comprises a water pump 1005, which is used to output cooling water to dissipate heat for the power battery 1002. In the embodiment shown in FIG. 9 and FIG. 10, the outlet of the oil pump 104 is used to input cooling oil into at least one of the heat exchanger 30 and the direct flow channel 40.

[0118] The heat exchanger 30 comprises another inlet of the heat exchanger 30 and another outlet of the heat exchanger 30, the another inlet of the heat exchanger 30 is used to communicate the water pump 1005 and is used to receive the cooling water output by the water pump 1005 to exchange heat with the cooling oil in the heat exchanger 30. The another outlet of the heat exchanger 30 is used to output the cooled cooling water to the outside of the heat exchanger 30.

[0119] In an embodiment, the valve 50 of the power assembly 100 is further used to adjust the opening degree of the valve 50 according to the temperature of the power battery 1002. Specifically, when the temperature of the power battery 1002 is less than a fourth preset temperature value, the valve 50 adjusts the opening degree of the valve 50 to be less than a fourth opening degree. The fourth opening degree is less than the second opening degree.

[0120] For example, when the temperature of the external environment is low, in order to make the power battery 1002 work normally, it is usually necessary to heat the whole electric vehicle 1000 and the power battery 1002 of the electric vehicle 1000. At this time, the electric motor 103 can be used to work in the locked-rotor heating mode, so that at least one of the stator and the rotor of the electric motor 103 can heat the cooling oil in the motor accommodating cavity 11. Heating the cooling oil by at least one of the stator and the rotor of the electric motor 103 can increase the temperature of the cooling oil.

[0121] As shown in FIG. 9 and FIG. 10, by reducing the opening degree of the valve 50 through the valve 50, the flow of the cooling oil delivered by the outlet of the oil pump 104 to the heat exchanger 30 is increased, and the flow of the cooling oil delivered by the oil pump 104 to the direct flow channel 40 is reduced. When the flow of the cooling oil delivered by the outlet of the oil pump 104 to the heat exchanger 30 is increased, the cooling oil delivered to the heat exchanger 30 can exchange heat with the cooling water input from the another inlet of the heat exchanger 30, so as to increase the temperature of the cooling water input to the heat exchanger 30, thereby achieving the effect of heating the cooling water. The heated cooling water can be delivered to the side of the power battery 1002 through the whole vehicle cooling system of the electric vehicle 1000, and can achieve the effect of heating the power battery 1002, so that the power battery 1002 works in a suitable temperature environment, and the working performance and the service life of the power battery 1002 are improved.

[0122] It can be understood that, in the embodiments shown in FIG. 9 and FIG. 10, the valve 50, the direct connection flow channel 40 and the heat exchanger 30 can also work in cooperation with the water pump 1005, so as to realize dynamic adjustment of the temperature of the cooling liquid in the power assembly 100, and also realize dynamic adjustment of the temperature of the cooling water in the vehicle cooling system of the electric vehicle 1000, so as to further improve the working performance and service life of the electric vehicle 1000 and reduce the power consumption of the electric vehicle 1000.

[0123] In an embodiment, along the direction of the flow of the cooling liquid in the direct connection flow channel 40, the flow distance of the cooling liquid in the direct connection flow channel 40 is greater than the interval between one inlet of the heat exchanger 30 and the outlet of the heat exchanger 30. Wherein, the interval between the direct connection flow channel inlet 41 and the outlet of the oil pump 104 is less than the interval between one inlet of the heat exchanger 30 and the outlet of the oil pump 104, and the interval between the direct connection flow channel outlet 42 and one flow channel inlet 14 is less than the interval between the outlet of the heat exchanger 30 and one flow channel inlet 14.

[0124] In the embodiment shown in FIG. 10, along the direction of the flow of the cooling liquid, the direct connection flow channel inlet 41 is located between the outlet of the oil pump 104 and one inlet of the heat exchanger 30, so that the cooling liquid output by the outlet of the oil pump 104 can be first delivered into the direct connection flow channel inlet 41, and the effect of the valve 50 on adjusting the flow of the cooling liquid delivered into the direct connection flow channel 40 can be improved.

[0125] At the same time, along the direction of the flow of the cooling liquid, the direct connection flow channel outlet 42 is located between the outlet of the heat exchanger 30 and one flow channel inlet 14, so that the cooling liquid output by the direct connection flow channel outlet 42 is delivered into one flow channel inlet 14 earlier than the cooling liquid output from the outlet of the heat exchanger 30, and thus the influence of the temperature of the cooling liquid output from the outlet of the heat exchanger 30 on the temperature of the cooling liquid output by the direct connection flow channel outlet 42 can be reduced, so as to improve the adjustment performance and temperature maintaining effect of the temperature of the cooling liquid delivered into one flow channel inlet 14.

[0126] In an embodiment, please refer to FIG. 11, which is a partial planar structure schematic view of the direct connection flow channel 40 and the heat exchanger 30 of the power assembly 100 provided by the embodiment of the present application. In the embodiment shown in FIG. 11, the aperture of the direct connection flow channel 40 is greater than the aperture of one inlet of the heat exchanger 30.

[0127] For example, the aperture of the direct connection flow channel 40 is schematically shown as a first aperture D1 in the embodiment shown in FIG. 11, and the aperture of one inlet of the heat exchanger 30 is schematically shown as a second aperture D2 in the embodiment shown in FIG. 11. Wherein, the first aperture D1 is greater than the second aperture D2.

[0128] It can be understood that, since the larger the aperture, the smaller the flow resistance of the coolant, the aperture of the direct connection flow channel 40 is larger than the aperture of one inlet of the heat exchanger 30, so that the coolant output by the outlet of the oil pump 104 can be more easily transported from the inlet of the direct connection flow channel 40 into the direct connection flow channel 40, avoiding the direct connection flow channel 40 that may increase the flow resistance of the coolant due to too many bends of the flow path and other factors, thereby being able to improve the adjustment accuracy of the valve 50 to the flow of the coolant transported into the heat exchanger 30 and the direct connection flow channel 40. That is, the accuracy of the valve 50 in adjusting the temperature of the coolant inside the power assembly 100 can be further improved, and the sensitivity of the valve 50 in adjusting the temperature of the coolant can be improved.

[0129] In the embodiment shown in FIG. 11, only the apertures of the direct connection flow channel 40 and one inlet of the heat exchanger 30 are exemplarily introduced in one possible embodiment, but the actual apertures between the apertures of the direct connection flow channel 40 and one inlet of the heat exchanger 30, and the proportional relationship of the relative sizes of the two are not limited to this. In other embodiments of the present application, the apertures of the direct connection flow channel 40 and one inlet of the heat exchanger 30 can be adjusted according to actual design requirements, that is, the apertures of the direct connection flow channel 40 and one inlet of the heat exchanger 30 can be equal or not equal, and the relative size relationship between the two can also be adjusted according to actual design requirements.

[0130] Please refer to FIG. 12, which is a planar structure schematic diagram of the transmission flow channel 20 of the power assembly 100 provided by the embodiments of the present application for conveying the coolant. As shown in FIG. 11, along the direction of the flow of the coolant, the flow distance of the coolant from one flow channel inlet 14 to one flow channel outlet 151 is less than the flow distance of the coolant from one flow channel inlet 14 to another flow channel outlet 152.

[0131] In the embodiment shown in FIG. 12, along the direction of the flow of the coolant, the coolant input from one flow channel inlet 14 first flows into one flow channel outlet 151 and then flows into another flow channel outlet 152, so that the coolant input from one flow channel inlet 14 is first transported into the motor accommodating cavity 11 to cool the stator and rotor of one motor, and then transported from another flow channel outlet 152 into the speed reducer accommodating cavity 12 to lubricate the gear or bearing of the speed reducer 101.

[0132] Meanwhile, the cooling liquid in the transmission flow channel 20 is first delivered into the motor accommodating cavity 11 and then into the speed reducer accommodating cavity 12, and the stator and rotor of the motor 103 accommodated in the motor accommodating cavity 11 can heat the cooling liquid input from one flow channel outlet 151, so that the cooling liquid with a temperature increased after heating is circulated in the power assembly 100 first to increase the overall temperature of the cooling liquid in the power assembly 100. While increasing the cooling liquid temperature increasing efficiency, the lubrication effect and efficiency of the gear and bearing of the speed reducer 101 can be improved when the cooling liquid is delivered into the speed reducer accommodating cavity 12 through the other flow channel outlet 152, and the oil stirring loss of the gear shaft of the speed reducer is reduced.

[0133] In one embodiment, the aperture of one flow channel outlet 151 is smaller than the aperture of the other flow channel outlet 152. In the embodiment shown in FIG. 12, the aperture of one flow channel outlet 151 is a third aperture D3, and the aperture of the other flow channel outlet 152 is a fourth aperture D4. The third aperture D3 is smaller than the fourth aperture D4.

[0134] It can be understood that the apertures of the two flow channel outlets 15 are designed differently, so that the flow resistance of the cooling liquid of the two flow channel outlets 15 is adjusted differently, and the flow of the cooling liquid of the two flow channel outlets 15 can be distributed adaptively. Specifically, by setting the aperture of one flow channel outlet 151 for delivering the cooling liquid into the motor accommodating cavity 11 of the motor 103 to be smaller than the aperture of the other flow channel outlet 152 for delivering the cooling liquid into the speed reducer accommodating cavity 12, the flow resistance of the cooling liquid of one flow channel outlet 151 is smaller than that of the other flow channel outlet 152, so that the cooling liquid delivered from one flow channel inlet 14 can be more easily delivered into the other flow channel outlet 152, and the cooling liquid can be more distributed to the other flow channel outlet 152.

[0135] That is, by differentiating the apertures of the two flow channel outlets 15, the flow of the cooling liquid delivered by the transmission flow channel 20 into the motor accommodating cavity 11 and the speed reducer accommodating cavity 12 can be adjusted adaptively according to the different heat dissipation requirements of the motor 103 and the lubrication requirements of the speed reducer 101, so that the heat dissipation effect of the cooling liquid on the stator and rotor of the motor 103 is ensured, and the lubrication effect of the cooling liquid on the speed reducer is improved at the same time.

[0136] In one embodiment, along the direction of the flow of the cooling liquid, the flow distance of the cooling liquid from one flow channel inlet 14 to the two flow channel outlets 15 is smaller than the flow distance of the cooling liquid from one flow channel inlet 14 to one or more of the remaining flow channel outlets 153.

[0137] It can be understood that, along the direction of the flow of the cooling liquid, the cooling liquid is first delivered to the motor side and then to the engine side. That is, the cooling liquid is first delivered to the motor accommodating cavity 11 and the reducer accommodating cavity 12 and then to the generator accommodating cavity 13. According to the different needs of the motor 103, the reducer 101 and the generator 102 for the cooling liquid, the order of the delivery of the cooling liquid into the motor accommodating cavity 11, the reducer accommodating cavity 12 and the generator accommodating cavity 13 is adaptively adjusted to improve the cooling or lubricating efficiency of the cooling liquid on the functional structures in the power assembly 100.

[0138] Of course, each of the above embodiments can be applied alone or in combination. The above is the preferred embodiment of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered to be within the scope of protection of the present application.

Claims

1. A powertrain split by a direct link flow path, characterized by, The housing of the power assembly comprises a motor receiving cavity for receiving a stator and a rotor of a motor, a reducer receiving cavity for receiving gears and bearings of a reducer, a flow channel inlet, and a plurality of flow channel outlets, wherein: The flow channel inlet is configured to deliver cooling fluid to the plurality of flow channel outlets through a common delivery flow channel, and two of the plurality of flow channel outlets are configured to deliver cooling fluid to the motor receiving cavity and the reducer receiving cavity, respectively. An outlet of an oil pump is configured to deliver cooling fluid to the flow channel inlet through a heat exchanger and a direct flow channel, respectively, and the valve is configured to adjust a flow rate of cooling fluid delivered to the flow channel inlet by at least one of the heat exchanger and the direct flow channel.

2. The powertrain of claim 1, wherein, The direct flow channel comprises a direct flow channel inlet and a direct flow channel outlet, and the direct flow channel inlet is configured to receive cooling fluid and deliver cooling fluid to the direct flow channel outlet, wherein: The direct flow channel inlet is configured to deliver cooling fluid to the direct flow channel outlet through the valve.

3. The powertrain of claim 2, wherein, The outlet of the oil pump is configured to deliver cooling fluid to the inlet of the heat exchanger and the direct flow channel inlet, respectively. The outlet of the heat exchanger and the direct flow channel outlet are configured to deliver cooling fluid to the flow channel inlet simultaneously.

4. The powertrain of claim 2, wherein, In a direction of cooling fluid flow in the direct flow channel, a flow distance of cooling fluid in the direct flow channel is greater than a distance between the inlet of the heat exchanger and the outlet of the heat exchanger, wherein: A distance between the direct flow channel inlet and the outlet of the oil pump is less than a distance between the inlet of the heat exchanger and the outlet of the oil pump. A distance between the direct flow channel outlet and the flow channel inlet is less than a distance between the outlet of the heat exchanger and the flow channel inlet.

5. The powertrain of claim 2, wherein, An aperture of the direct flow channel is greater than an aperture of the inlet of the heat exchanger.

6. The powertrain of any one of claims 1-5, wherein, One of the two flow channel outlets is configured to deliver cooling fluid to the motor receiving cavity, and the other of the two flow channel outlets is configured to deliver cooling fluid to the reducer receiving cavity, wherein: In a direction of cooling fluid flow, a flow distance of cooling fluid from the flow channel inlet to the one of the two flow channel outlets is less than a flow distance of cooling fluid from the flow channel inlet to the other of the two flow channel outlets.

7. The powertrain of claim 6, wherein, An aperture of the one of the two flow channel outlets is less than an aperture of the other of the two flow channel outlets.

8. The powertrain of any one of claims 1-7, wherein, The housing of the power assembly further comprises a generator receiving cavity for receiving a stator and a rotor of a generator, and one or more of the plurality of flow channel outlets is configured to deliver cooling fluid to the generator receiving cavity, wherein: In a direction of cooling fluid flow, a flow distance of cooling fluid from the flow channel inlet to the two flow channel outlets is less than a flow distance of cooling fluid from the flow channel inlet to the one or more of the plurality of flow channel outlets.

9. The powertrain of any of claims 1-8, wherein, The one valve is configured to: reduce the flow rate of the coolant flowing into the one flow passage inlet through the one direct flow passage and increase the flow rate of the coolant flowing into the one flow passage inlet through the one heat exchanger; increase the flow rate of the coolant flowing into the one flow passage inlet through the one direct flow passage and reduce the flow rate of the coolant flowing into the one flow passage inlet through the one heat exchanger.

10. The powertrain of any one of claims 1-9, wherein, The one valve adjusts the opening degree of the one valve, wherein: the opening degree of the one valve is increased, and the flow rate of the coolant flowing into the one flow passage inlet through the one heat exchanger is reduced, and the flow rate of the coolant flowing into the one flow passage inlet through the one direct flow passage is increased; the opening degree of the one valve is decreased, and the flow rate of the coolant flowing into the one flow passage inlet through the one heat exchanger is increased, and the flow rate of the coolant flowing into the one flow passage inlet through the one direct flow passage is reduced.

11. The powertrain of claim 10, wherein, The one valve is configured to adjust the opening degree of the one valve according to at least one of the temperature of the coolant in the one motor housing and the temperature of the coolant in the one reduction gear housing, wherein: when the temperature of the coolant in the one reduction gear housing is less than a first preset temperature value, the one valve adjusts the opening degree of the one valve to be greater than a first opening degree; when the temperature of the coolant in the one motor housing is greater than a second preset temperature value, the one valve adjusts the opening degree of the one valve to be less than a second opening degree, the second opening degree being less than the first opening degree; when the temperature of at least one of the stator or the rotor of the one motor is greater than a third preset temperature value, the third preset temperature value being greater than the second preset temperature value, the one oil pump delivers the coolant into the one heat exchanger through the one valve adjusting the opening degree of the one valve to be a third opening degree, the third opening degree being less than the second opening degree.

12. The powertrain of any one of claims 1-11, wherein, The power assembly further comprises at least one filter, and the coolant output by the outlet of the one oil pump flows through the at least one filter before being delivered into the one flow passage inlet through the one direct flow passage and the one heat exchanger.

13. An electric vehicle characterized by comprising: The electric vehicle comprises a power battery, wheels, and the power assembly according to any one of claims 1-12, the power battery being configured to provide power to the one motor of the power assembly and drive the wheels through the one motor. The electric vehicle comprises a power battery, wheels, and the power assembly according to any one of claims 1-12, the power battery being configured to provide power to the one motor of the power assembly and drive the wheels through the one motor.

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