Powertrain containing parallel flow channels, and electric vehicle

Abstract

A powertrain (100) containing parallel flow channels, and an electric vehicle (1000). The powertrain (100) comprises a generator (102), an electric motor (103), an oil pump (20), an electric motor flow channel (11), and a generator flow channel (12). The electric motor flow channel (11) comprises electric motor flow channel inlets (111), electric motor flow channel outlets (112), and a valve (30). The electric motor flow channel outlets (112) are used to output a coolant to dissipate heat from a rotor or a stator of the electric motor (103). The valve (30) is used to communicate one or more of the electric motor flow channel inlets (111) with one or more of the electric motor flow channel outlets (112). The generator flow channel (12) comprises generator flow channel inlets (121) and generator flow channel outlets (122). The generator flow channel outlets (122) are used to output a coolant to dissipate heat from a rotor or a stator of the generator (102). An outlet of the oil pump (20) is used to communicate the electric motor flow channel inlets (111) with the generator flow channel inlets (121). The valve (30) is used to simultaneously adjust the flow rate of one or more of the electric motor flow channel inlets (112) and the flow rate of one or more of the generator flow channel outlets (122).

Description

Power assembly and electric vehicle with parallel flow channels

[0001] The present application claims priority to the Chinese patent application No. 202410520181.4, filed on April 28, 2024, with the State Intellectual Property Office of China, with the title of “Power assembly and electric vehicle with parallel flow channels”, 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 parallel flow channels. BACKGROUND

[0003] The housing of the power assembly is integrated with several internal flow channels for delivering cooling liquid to each motor in the power assembly for heat dissipation, or for delivering cooling liquid to the transmission mechanism in the power assembly for lubrication, to ensure the normal operation and stable work of the power assembly. However, the cooling liquid flow distribution efficiency in each internal flow channel of the existing power assembly is not high, and the cooling liquid flow distribution in each internal flow channel cannot be adjusted adaptively according to the working conditions of the power assembly, resulting in cooling liquid loss and increased overall energy consumption of the power assembly. SUMMARY

[0004] The present application provides a power assembly with parallel flow channels, which can improve the utilization rate of cooling liquid in the power assembly and reduce the loss of cooling liquid and the overall energy consumption of the power assembly by optimizing the structural design of the internal flow channels 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 parallel flow channels, the power assembly comprising a generator, an electric motor and an oil pump, the power assembly comprising an electric motor flow channel and a generator flow channel, wherein the electric motor flow channel comprises at least one electric motor flow channel inlet, at least one electric motor flow channel outlet and a valve, one or more electric motor flow channel outlets of the at least one electric motor flow channel outlet are used to output cooling liquid to at least one of the rotor or the stator of an electric motor, the valve is used to connect one or more electric motor flow channel inlets and one or more electric motor flow channel outlets, the generator flow channel comprises at least one generator flow channel inlet and at least one generator flow channel outlet, one or more generator flow channel outlets of the at least one generator flow channel outlet are used to output cooling liquid to at least one of the rotor or the stator of a generator, the outlet of the oil pump is used to connect the at least one electric motor flow channel inlet and the at least one generator flow channel inlet, and the valve is used to adjust the flow of one or more electric motor flow channel outlets and one or more generator flow channel outlets simultaneously.

[0006] The generator of the power assembly is used to provide electric energy to the power battery of the electric vehicle, and drive the motor shaft of the electric motor to rotate through the power battery to input power to the transmission mechanism in transmission connection with the electric motor in the power assembly. The power output by the electric motor is output to the outside of the power assembly through the transmission mechanism in transmission connection with the electric motor in the power assembly, thereby realizing the effect of outputting power to the outside of the power assembly. The oil pump provides negative pressure to suck the cooling liquid through the inlet of the oil pump, and the outlet of the oil pump is respectively input to at least one of the electric motor flow channel and the generator flow channel. The oil pump delivers the cooling liquid to the side of the electric motor through the electric motor flow channel, so as to deliver the cooling liquid to at least one of the stator or the rotor of the electric motor to dissipate heat, or to lubricate at least one of the gear and the bearing of the transmission mechanism in transmission connection with the electric motor, such as the reducer and the differential. The oil pump delivers the cooling liquid to the side of the generator through the generator flow channel, so as to deliver the cooling liquid to at least one of the stator or the rotor of the generator to dissipate heat, or to lubricate at least one of the gear and the bearing of the transmission mechanism in transmission connection with the generator. The power assembly delivers the cooling liquid to the side of the electric motor through the electric motor flow channel to lubricate or dissipate heat, and delivers the cooling liquid to the side of the generator through the generator flow channel to lubricate or dissipate heat, so as to ensure that the electric motor and the generator work at a suitable working temperature and have good lubrication effect, thereby improving the working performance and the service life of the electric motor and the generator, and improving the working performance and the service life of the power assembly as a whole.

[0007] The number of motor flow channel entrances of one motor flow channel of the power assembly is one or more, each motor flow channel entrance is communicated with one or more motor flow channel exits, that is, the cooling liquid output by the outlet of one oil pump is simultaneously output to one or more motor flow channel exits through each motor flow channel entrance, and the one or more motor flow channel exits are used for heat dissipation of at least one of the stator or the rotor on the motor side of the power assembly. The number of generator flow channel entrances of one generator flow channel is one or more, each generator flow channel entrance is communicated with one or more generator flow channel exits, that is, the cooling liquid output by the outlet of one oil pump is simultaneously output to one or more generator flow channel exits through each generator flow channel entrance, and the one or more generator flow channels are used for heat dissipation of at least one of the stator or the rotor on the generator side. One valve is arranged on one motor flow channel, so that one or more motor flow channel entrances of one motor flow channel can be communicated with one or more motor flow channel exits through the valve, thereby realizing the effect that one valve controls the cooling liquid transported by one or more motor flow channel entrances to one or more motor flow channel exits, and the flow of the cooling liquid output by one or more motor flow channel exits can be adjusted through the valve. At the same time, since one motor flow channel and one generator flow channel are connected in parallel, one or more motor flow channel exits of one motor flow channel and one or more generator flow channel exits of one generator flow channel are also connected in parallel, and when the flow of one or more motor flow channel exits is adjusted by one valve, the flow of the cooling liquid output by one or more generator flow channel exits is also adjusted synchronously. The power assembly adjusts the flow of the cooling liquid output by one or more motor flow channel exits and one or more generator flow channel exits through one valve, so as to realize the independent adjustment of one or more motor flow channel exits and one or more generator flow channel exits in the power assembly, so that the flow of the cooling liquid output by each internal flow channel in the power assembly can be reasonably distributed, and each internal flow channel in the power assembly can adjust the flow of the cooling liquid output by the internal flow channel in the power assembly according to different working conditions of the power assembly, thereby improving the utilization rate of the cooling liquid to reduce the loss of the cooling liquid, improving the overall working performance and service life of the power assembly, and reducing the power consumption of the power assembly.

[0008] One implementation, each motor flow channel entrance is used for transmitting cooling liquid to one or more motor flow channel exits, and each generator flow channel entrance is used for transmitting cooling liquid to one or more generator flow channel exits, wherein, along the direction of the flow of the cooling liquid output by one oil pump, the flow distance from the outlet of one oil pump to each generator flow channel entrance is greater than the flow distance from the outlet of one oil pump to each motor flow channel entrance.

[0009] Correspondingly, the number of at least one motor flow passage inlet of one motor flow passage is one, and one motor flow passage inlet simultaneously transmits cooling liquid to one or more motor flow passage outlets. The number of at least one generator flow passage inlet of one generator flow passage is one, and one generator flow passage inlet can simultaneously transmit cooling liquid to one or more generator flow passage outlets. The cooling liquid output by the outlet of one oil pump is respectively transmitted to the motor side of the power assembly through one motor flow passage inlet for heat dissipation or lubrication, and to the generator side through one generator flow passage inlet for heat dissipation or lubrication, so that parallel effects are formed between each internal flow passage for transmitting cooling liquid to each motor side for heat dissipation or lubrication. Therefore, when one valve adjusts the flow of one or more motor flow passage outlets of one motor flow passage, one valve can simultaneously adjust the flow of one or more outlets of other internal flow passages connected in parallel with one motor flow passage according to different working conditions of the power assembly, so that the cooling liquid output by the outlet of each internal flow passage can be accurately output according to different working conditions of the power assembly, thereby further improving the utilization rate of the cooling liquid. At the same time, since the motor in the power assembly is used to generate power and is used to output power through a transmission mechanism such as a reducer, a differential and the like, the heat generation of the motor side in the power assembly is larger than that of the transmission mechanism, and there are more functional structural components in the transmission mechanism. In the direction of the cooling liquid flow output by one oil pump, the cooling liquid output by the outlet of one oil pump is first flowed into one or more motor flow passage inlets and then transmitted to one or more generator flow passage inlets, so that the cooling liquid output by the outlet of one oil pump can be transmitted to the motor side for heat dissipation or lubrication earlier, thereby forming more cooling liquid distributed from one motor flow passage inlet to the motor side to ensure the heat dissipation and lubrication effect of the cooling liquid on the motor side, thereby improving the utilization rate of the cooling liquid while further improving the working performance and service life of the power assembly as a whole.

[0010] An implementation manner, the aperture of each motor flow passage inlet is larger than the aperture of each generator flow passage inlet.

[0011] Correspondingly, the greater the aperture of each internal flow passage inlet, the smaller the resistance to the cooling liquid at each internal flow passage inlet. Therefore, by setting the aperture of each motor flow passage inlet to be greater than the aperture of each generator flow passage inlet, the cooling liquid output by an oil pump can be more easily transmitted into each motor flow passage inlet, and thus the cooling liquid output by an oil pump can be more easily distributed to the motor side through a motor flow passage under the premise that the rotation speed of the oil pump remains unchanged, so as to perform heat dissipation and lubrication on the motor side which has greater heat dissipation and lubrication requirements. That is, on the basis of simultaneously adjusting the flow rates of one or more motor flow passage outlets and one or more generator flow passage outlets through a valve, by differentiating the apertures of each motor flow passage inlet and each generator flow passage inlet, the cooling liquid output by an oil pump can be further reasonably and targetedly distributed according to the different heat dissipation and lubrication requirements of each motor in the power assembly, so as to further improve the utilization rate of the cooling liquid, reduce the loss of the cooling liquid and the power consumption of the power assembly as a whole.

[0012] In an implementation, the other one or more of the at least one motor flow passage outlet is used to output cooling liquid for lubricating at least one of a bearing or a speed reducer of the one motor, wherein the one motor flow passage inlet is used to communicate the one or more motor flow passage outlets, and the other motor flow passage inlet is used to communicate the other one or more motor flow passage outlets, and the flow distance from the outlet of the oil pump to the one motor flow passage inlet is greater than the flow distance from the outlet of the oil pump to the other motor flow passage inlet in the direction of the flow of the cooling liquid output by the oil pump.

[0013] Correspondingly, a part of the at least one motor flow passage outlet is used to output the coolant to at least one of the stator or the rotor of the motor for heat dissipation, and another part of the at least one motor flow passage outlet is used to output the coolant to at least one of the gear or the bearing of the reduction gear on the motor side for lubrication, so that the coolant output by the outlet of the oil pump through the one or more motor flow passage inlets can simultaneously perform heat dissipation on at least one of the stator or the rotor of the motor and lubrication on at least one of the gear or the bearing of the reduction gear. The coolant can be transmitted to different functional structures in the power assembly for lubrication or heat dissipation through the one motor flow passage, which can further improve the protection effect of different functional structures in the motor side of the power assembly, so as to further improve the working performance and service life of the entire power assembly. At the same time, the part of the at least one motor flow passage outlet used for heat dissipation of the stator or the rotor of the motor is transmitted by the coolant transmitted through the one motor flow passage inlet, and the other part of the at least one motor flow passage outlet used for lubrication of the gear or the bearing of the reduction gear is transmitted by the coolant transmitted through the other motor flow passage inlet, that is, the coolant used for heat dissipation and lubrication on the motor side is transmitted through different motor flow passage inlets, so as to realize the parallel connection effect of the plurality of motor flow passage inlets in the one motor flow passage. Therefore, when the valve adjusts the flow of the one or more motor flow passage outlets at the same time, the parallel connection of the plurality of motor flow passage inlets can improve the effect of the valve on the reasonable distribution of the flow of the one or more motor flow passage outlets under the condition that the rotation speed of the oil pump is unchanged, further improve the utilization rate of the coolant, and reduce the loss of the coolant and the power consumption of the power assembly. At the same time, along the flow direction of the coolant output by the oil pump, the coolant output by the outlet of the oil pump is first transmitted to the other motor flow passage inlet used for outputting the coolant for lubrication of the reduction gear, and then transmitted to the one motor flow passage inlet used for outputting the coolant for heat dissipation of the stator or the rotor of the motor, so that the coolant output by the outlet of the oil pump can be transmitted to the reduction gear for lubrication in advance, so as to ensure the lubrication effect of the coolant on the reduction gear, thereby improving the utilization rate of the coolant, and further improving the working performance and service life of the entire power assembly.

[0014] In an implementation, the aperture of the one or more motor flow passage outlets is larger than the aperture of the other or the plurality of motor flow passage outlets.

[0015] Correspondingly, the greater the aperture of each internal flow channel outlet, the smaller the flow resistance experienced by the coolant in each internal flow channel. Therefore, the aperture of one or more motor flow channel outlets is greater than the aperture of another or another plurality of motor flow channel outlets, which can make it easier for the coolant to be distributed to the one or more motor flow channel outlets under the premise that the rotational speed of one oil pump remains unchanged. By increasing the flow of coolant output by the one or more motor flow channel outlets, the heat dissipation effect of at least one of the stator or rotor of one motor can be further improved. That is, on the basis that one valve simultaneously adjusts the flow of the one or more motor flow channel outlets and the flow of the another or another plurality of motor flow channel outlets, by differentiating the aperture of the one or more motor flow channel outlets and the aperture of the another or another plurality of motor flow channel outlets, the output flow of the coolant can be further reasonably distributed according to the heat dissipation needs of the stator and rotor on the motor side and the lubrication needs of the reducer, and the utilization rate of the coolant can be further improved, the loss of the coolant and the powertrain as a whole can be reduced, and the power consumption of the powertrain as a whole can be reduced.

[0016] An implementation manner is that the another or another plurality of generator flow channel outlets for outputting the coolant to lubricate the bearing of one generator, wherein one generator flow channel inlet is used to communicate the one or more generator flow channel outlets, and another generator flow channel inlet is used to communicate the another or another plurality of generator flow channel outlets, and the aperture of the one or more generator flow channel outlets is greater than the aperture of the another or another plurality of generator flow channel outlets.

[0017] Correspondingly, by setting another or another plurality of generator flow channel outlet outputs cooling liquid to lubricate a gear or a bearing in the transmission mechanism drivingly connected with a generator, the working performance and service life of the transmission mechanism on the generator side can be improved, so as to further improve the working performance and service life of the power assembly. Part of the generator flow channel outlet for heat dissipation of the stator or rotor of a generator is supplied with cooling liquid by a generator flow channel inlet, and another part of the generator flow channel outlet for lubricating a gear or a bearing in the transmission mechanism drivingly connected with a generator is supplied with cooling liquid by another generator flow channel inlet, that is, the cooling liquid for heat dissipation and lubrication on the generator side is supplied by different generator flow channel inlets, so as to realize the effect of parallel connection of multiple generator flow channel inlets in a generator flow channel. Therefore, when a valve simultaneously adjusts the flow of one or more generator flow channel outlets, by setting multiple generator flow channel inlets in parallel, the effect of reasonable distribution of the flow of one or more generator flow channel outlets by a valve under the condition that the rotating speed of an oil pump is unchanged can be improved, the utilization rate of cooling liquid is further improved, and the loss of cooling liquid and the power consumption of the power assembly are reduced. At the same time, according to the influence of the aperture of the outlet of the internal flow channel on the flow resistance of the cooling liquid, by setting the apertures of the multiple generator flow channel outlets to be different from the apertures of the another or another plurality of generator flow channel outlets, the flow of the cooling liquid for heat dissipation and the flow of the cooling liquid for lubrication can be distributed based on the different characteristics of the heat dissipation demand and the lubrication demand on the generator side, so as to further improve the reasonable distribution effect of the output flow of the cooling liquid.

[0018] An implementation manner is that, along the direction of the flow of the cooling liquid output by an oil pump, the flow distance from the outlet of the oil pump to a generator flow channel inlet is greater than the flow distance from the outlet of the oil pump to another generator flow channel inlet.

[0019] Correspondingly, along the direction of the flow of the cooling liquid output by an oil pump, by setting the cooling liquid output by the outlet of the oil pump to flow into another generator flow channel inlet for outputting cooling liquid to lubricate the transmission mechanism on the generator side first, and then to a generator flow channel inlet for outputting cooling liquid to heat the stator or rotor of a generator, the cooling liquid output by the outlet of the oil pump can be transported to the transmission mechanism on the generator side for lubrication first, so as to ensure the effect of lubricating the transmission mechanism on the generator side by the cooling liquid, and further improve the working performance and service life of the power assembly as a whole while improving the utilization rate of the cooling liquid.

[0020] One implementation, under the premise of keeping the rotating speed of the oil pump unchanged, the opening degree of one valve is adjusted, wherein, the opening degree of one valve is increased, at the same time, the flow of one or more motor flow passages outlet is increased and the flow of one or more generator flow passages outlet is decreased, the opening degree of one valve is decreased, at the same time, the flow of one or more motor flow passages outlet is decreased and the flow of one or more generator flow passages outlet is increased.

[0021] Correspondingly, since one valve can connect one or more motor flow passages inlet and one or more motor flow passages outlet, one valve forms the effect of being in series with one motor flow passage. Therefore, when the opening degree of one valve is adjusted, one valve can adjust and control the flow of one or more motor flow passages outlet of one motor flow passage, thereby realizing the effect of one valve synchronously adjusting the flow of one or more motor flow passages outlet. And, since one or more motor flow passages inlet and one or more generator flow passages inlet are in parallel, when one valve adjusts the flow of one or more motor flow passages outlet, under the premise of keeping the rotating speed of the oil pump unchanged, one valve will simultaneously adjust the flow of one or more generator flow passages outlet. When one valve synchronously adjusts the flow of one or more motor flow passages outlet and the flow of one or more generator flow passages outlet, the cooling liquid output by one motor flow passage and one generator flow passage can be adjusted according to different working conditions of the power assembly. That is, the cooling liquid output by one motor flow passage and one generator flow passage is more targeted and adaptive when dissipating heat or lubricating functional structural parts in the power assembly, so as to further improve the utilization rate of the cooling liquid to reduce the loss of the cooling liquid and the overall power consumption of the power assembly.

[0022] One implementation, under the premise of keeping the rotating speed of the oil pump unchanged, with the adjustment of the opening degree of one valve, the change amount of the flow of each motor flow passage outlet is different.

[0023] Correspondingly, since each motor flow passage outlet outputs cooling liquid to lubricate or dissipate heat for different functional structural parts on the motor side, and different functional structural parts in the motor side have different heat dissipation requirements or lubrication requirements, each functional structural part on the motor side has different cooling liquid demand. Therefore, under the premise of keeping the rotating speed of the oil pump unchanged, one valve adjusts the opening degree of one valve, so that the change amount of the flow of cooling liquid output by each motor flow passage outlet is different, so that the cooling liquid output by each motor flow passage outlet can meet the demand of each functional structural part on the motor side for cooling liquid, further improving the precise and reasonable distribution effect of one valve adjusting the cooling liquid output by one or more motor flow passages outlet.

[0024] One implementation, one valve is used to adjust the opening degree of one valve according to the working condition of at least one of one motor or one generator, wherein when at least one of the rotating speed or the torque of one motor increases from a first preset value to a second preset value, the opening degree of one valve is adjusted from a first opening degree to a second opening degree, the first opening degree is smaller than the second opening degree, when at least one of the rotating speed or the torque of one generator decreases from a third preset value to a fourth preset value, the opening degree of one valve is adjusted from a third opening degree to a fourth opening degree, the third opening degree is greater than the fourth opening degree.

[0025] Correspondingly, when the output rotating speed or the output torque of one motor is different, the heat dissipation demand of the stator and the rotor of one motor, and the lubrication demand of one gear and one bearing in the reducer of the motor side are different. Therefore, one valve adjusts the opening degree of one valve based on the change of at least one of the output rotating speed or the output torque of one motor, so that the cooling liquid output from the outlet of one or more motor flow channels meets the demand of one motor for cooling liquid under different working conditions. While ensuring that the cooling liquid output from one motor flow channel meets the basic heat dissipation or lubrication demand of different functional structural components on the motor side, the precision and reasonable distribution effect of one valve in adjusting the cooling liquid output from one or more motor flow channel outlets is further improved.

[0026] One implementation, when at least one of the rotating speed or the torque of one motor is less than or equal to a fifth preset value, the opening degree of one valve remains a fifth opening degree, the fifth preset value is less than the first preset value, and the fifth opening degree is less than the first opening degree, when the temperature of one motor is greater than a preset temperature value, the opening degree of one valve remains a sixth opening degree, and the sixth opening degree is less than or equal to the second opening degree.

[0027] Correspondingly, one motor working at a suitable temperature can ensure the working performance and service life of one motor, therefore, one valve further increases the temperature of one motor working as a reference condition to adjust the flow rate of one or more motor flow channel outlets on the basis of taking at least one of the output rotating speed or the output torque of one motor as a reference condition to adjust the flow rate of one or more motor flow channel outlets, which can further improve the precision and reasonable distribution effect of one valve in adjusting the cooling liquid output from one or more motor flow channel outlets, so that the cooling liquid output from one or more motor flow channel outlets can adapt to different working states of the powertrain, while ensuring the working performance and service life of the powertrain, further reducing the overall power consumption of the powertrain.

[0028] One implementation, the powertrain further comprises one heat exchanger and at least one filter, wherein the cooling liquid flows through one heat exchanger and one filter before flowing into the inlet of one or more motor flow channels and the inlet of one or more generator flow channels.

[0029] Correspondingly, along the direction of the flow of the cooling liquid, a heat exchanger and a filter are further arranged between the oil pump and the inlet of the motor flow channel and the inlet of the generator flow channel, the heat exchanger is used for heat exchange of the cooling liquid to reduce the temperature of the cooling liquid and output, and the filter is used for filtering impurities or foreign matters that may be mixed into the cooling liquid to improve the cleanliness of the cooling liquid. By arranging the heat exchanger and the filter on the outlet side of the oil pump along the direction of the flow of the cooling liquid, the cooling liquid output by the outlet of the oil pump is subjected to heat exchange by the heat exchanger to reduce the temperature of the cooling liquid before being transported to the motor flow channel for lubrication or heat dissipation of the motor side and the generator flow channel for lubrication or heat dissipation of the generator side, so that the heat dissipation efficiency of the cooling liquid to the generator side or the motor side is ensured, and then the generator or the motor is ensured to work at an appropriate temperature, so as to further improve the working performance and the service life of the generator or the motor. At the same time, the impurities or foreign matters such as dust and abrasive particles that may be mixed into the cooling liquid are filtered by the filter to improve the cleanliness of the cooling liquid, so that when the cooling liquid lubricates the generator side or the motor side, the impurities or foreign matters that may be mixed into the cooling liquid are avoided to damage the transmission mechanism of the generator side or the motor side and reduce the working performance or the transmission efficiency of the transmission mechanism. That is, the cooling liquid output by the oil pump is further subjected to the heat exchanger and the filter before being transported to the engine side or the motor side for lubrication or heat dissipation, so as to further improve the working performance and the service life of the power assembly.

[0030] In an implementation, the at least one filter includes two filters, a filter in which the pore size of the filter screen is smaller than that of the filter screen in the other filter, wherein the cooling liquid flowing into the inlet of each motor flow channel and the inlet of each generator flow channel flows through one filter, and the cooling liquid flowing out of each motor flow channel outlet and each generator flow channel outlet flows into the inlet of the oil pump after flowing through the other filter.

[0031] Correspondingly, the two filters have different filter screen pore sizes, so that the two filters complement and cooperate when filtering the coolant, to further improve the filtering effect on the coolant. In the direction of the coolant flow, the filter screen with a relatively large pore size is arranged on the side of the inlet of an oil pump away from the outlet of the oil pump, and the filter screen with a relatively small pore size is arranged on the side of the outlet of the oil pump away from the inlet of the oil pump, so that the coolant is filtered by the filter screen with a relatively large pore size before flowing into the oil pump. The filter screen with a relatively large pore size can filter impurities or foreign matters with relatively large sizes such as volume and outer diameter that may be mixed in the coolant, to achieve the effect of rough filtering of the filter, and avoid damage to the oil pump caused by impurities or foreign matters with relatively large sizes that may be mixed in the filter, that is, the filter screen with a relatively large pore size can protect the oil pump, to improve the working performance and service life of the oil pump.

[0032] In an implementation, the housing of the power assembly is used to integrate two stator accommodating grooves, two internal flow channels and multiple bearing cavities, wherein the groove wall of each stator accommodating groove comprises one groove wall flow channel and one liquid outlet hole in communication, one stator accommodating groove is used to fix a stator of an electric motor, and the other stator accommodating groove is used to fix a stator of a generator, the liquid outlet hole of one stator accommodating groove serves as an electric motor flow channel outlet, and the liquid outlet hole of the other stator accommodating groove serves as a generator flow channel outlet, one end of each internal flow channel is used to communicate with the liquid outlet hole through the groove wall flow channel, the other end of one internal flow channel serves as an electric motor flow channel inlet, and the other end of the other internal flow channel serves as a generator flow channel inlet, and one internal flow channel is used to accommodate a valve, the inner peripheral wall of each bearing cavity comprises one liquid outlet hole, one bearing cavity is used to fix a bearing of an electric motor, and the other bearing cavity is used to fix a bearing of a generator, and the liquid outlet hole of one bearing cavity is used to communicate with one internal flow channel, and the liquid outlet hole of the other bearing cavity is used to communicate with the other internal flow channel.

[0033] Correspondingly, the maximum outer diameter of the motor can generally refer to the outer diameter of the inner stator, and thus each stator accommodating groove can accommodate a stator, a rotor coaxially arranged inside the stator, a motor shaft, and other possible functional structural members of the motor, that is, each stator accommodating groove is used to accommodate and fix one motor. The housing of the power assembly integrates two stator accommodating grooves, which are used to accommodate one motor and one generator respectively. Meanwhile, each stator accommodating groove is provided with a liquid outlet hole, and each liquid outlet hole is in communication with one end of an internal flow channel, so that one end of the internal flow channel can deliver cooling liquid to the stator or rotor in each stator accommodating groove through the liquid outlet hole for heat dissipation. In addition, one internal flow channel is also in communication with a liquid outlet, so as to deliver cooling liquid to each bearing cavity through the liquid outlet for lubricating the bearing accommodated in each bearing cavity, thereby improving the working performance and service life of each bearing. While delivering cooling liquid to the stator and rotor in each stator accommodating groove through two internal flow channels for heat dissipation and delivering cooling liquid to the bearing in each bearing cavity for lubrication to improve the working efficiency and service life of the power assembly, the two stator accommodating grooves, the two internal flow channels, and the plurality of bearing cavities are simultaneously integrated in the housing of the power assembly, so that the housing can simultaneously realize the functions of accommodating and fixing one or more motors, delivering cooling liquid, and accommodating and fixing bearings, thereby simplifying the internal structure design of the power assembly and improving the overall preparation efficiency of the power assembly.

[0034] In a second aspect, the present application also provides an electric vehicle, which comprises a wheel and the power assembly provided by any of the above implementation manners, and the power assembly is used to drive the wheel.

[0035] The power assembly of the electric vehicle provided by the present application inputs electric energy to one motor through one generator to drive one motor to rotate. One motor receives the electric energy input by one generator and converts the electric energy into power to output to the outside. One motor inputs power to the speed reducer through the motor shaft of the motor, and transmits power through the speed reducer to transmit power to the wheel, which can realize the effect that the power assembly drives the wheel to rotate and in turn drives the electric vehicle to travel. The electric vehicle of the present application is equipped with the power assembly in any of the above implementation manners, which can improve the working performance and service life of the electric vehicle of the present application. That is, because the power assembly in any of the above implementation manners is used, the electric vehicle of the present application has all the possible beneficial effects of the power assembly provided by any of the above implementation manners. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0037] Fig. 1 is a schematic diagram of a working scenario of an electric vehicle according to an embodiment of the present application;

[0038] Fig. 2 is a schematic diagram of a planar structure of a power assembly of the electric vehicle according to an embodiment of the present application;

[0039] Fig. 3 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0040] Fig. 4 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0041] Fig. 5 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0042] Fig. 6 is a schematic diagram of a partial planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0043] Fig. 7 is a schematic diagram of a working principle of a valve of the power assembly according to an embodiment of the present application;

[0044] Fig. 8 is a schematic diagram of a working principle of a valve of the power assembly according to an embodiment of the present application;

[0045] Fig. 9 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0046] Fig. 10 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0047] Fig. 11 is a schematic diagram of a partial planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0048] Fig. 12 is a schematic diagram of a partial planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0049] Fig. 13 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application;

[0050] Fig. 14 is a schematic diagram of a planar structure of an internal flow channel of the power assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] In the following, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0052] The present application provides a power assembly containing parallel flow channels, the power assembly comprising a generator, a motor and an oil pump, the power assembly comprising a motor flow channel and a generator flow channel, wherein the motor flow channel comprises at least one motor flow channel inlet, at least one motor flow channel outlet and a valve, one or more of the at least one motor flow channel outlet is used to output cooling liquid to dissipate heat from at least one of the rotor or the stator of the motor, the valve is used to connect the one or more motor flow channel inlets and the one or more motor flow channel outlets, the generator flow channel comprises at least one generator flow channel inlet and at least one generator flow channel outlet, one or more of the at least one motor flow channel outlet is used to output cooling liquid to dissipate heat from at least one of the rotor or the stator of the generator, the outlet of the oil pump is used to connect the at least one motor flow channel inlet and the at least one generator flow channel inlet, and the valve is used to simultaneously adjust the flow of the one or more motor flow channel outlets and the one or more generator flow channel outlets. The power assembly of the present application can improve the utilization rate of the cooling liquid in the power assembly, reduce the loss of the cooling liquid and reduce the overall energy consumption of the power assembly by optimizing the structure design of the flow channels in the power assembly.

[0053] The present application provides an electric vehicle, the electric vehicle comprising wheels and the power assembly provided in the above implementation manners, the power assembly being used to drive the wheels. The power assembly carried by the electric vehicle of the present application can adjust the distribution of the cooling liquid flow based on different working conditions, thereby improving the utilization rate of the cooling liquid, reducing the loss of the cooling liquid and the overall loss of the power assembly, and further reducing the power consumption of the electric vehicle of the present application and the use cost of the electric vehicle on the basis of improving the overall working performance and the service life of the electric vehicle.

[0054] 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.

[0055] 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 vehicle 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.

[0056] 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 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.

[0057] For example, the power assembly 100 comprises a speed reducer 101, and at least one of 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.

[0058] In one embodiment, the electric motor 103 is in transmission connection with the speed reducer 101. 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.

[0059] 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, so as to output power through the motor shaft 1033.

[0060] The stator 1031 comprises a stator core 1031a and a stator winding 1031b, the stator winding 1031b is wound on the stator core 1031a, and an alternating current is passed into the stator winding 1031b to generate a rotating stator magnetic field in the stator core 1031a to drive the rotor 1032 to rotate and synchronously drive the motor shaft 1033 to rotate around its own axis, thereby achieving the effect of the electric motor 103 outputting power to the outside.

[0061] The rotor 1032 comprises a rotor core and a rotor winding, the rotor winding is wound on the rotor core, and the rotor winding cuts the rotating stator magnetic field and generates an induced electromotive force and current. The rotor 1032 cooperates with the stator 1031 to form an electromagnetic torque to drive the rotor 1032 to rotate relative to the stator 1031, thereby driving the motor shaft 1033 to rotate around its own axis and outputting power to the outside.

[0062] In the embodiment shown in FIG. 1 and FIG. 2, the speed reducer 101 comprises a plurality of gears 1011 and a plurality of rotating shafts 1012, and the plurality of rotating shafts 1012 are arranged in parallel and at intervals. The plurality of gears 1011 are used to achieve the transmission connection between the plurality of rotating shafts 1012, so as to be able to transmit the power input by the electric motor 103 and output to the wheels 1001.

[0063] In one embodiment, the plurality of rotating shafts 1012 comprises an input shaft 1012a, an intermediate shaft 1012b and an output shaft 1012c, and the input shaft 1012a, the intermediate shaft 1012b and the output shaft 1012c are arranged in parallel and at intervals. Among them, the input shaft 1012a is used to drive connect the motor shaft 1033 of the electric motor 103, and the intermediate shaft 1012b is used to drive connect the output shaft 1012c through at least one gear 1011.

[0064] In one embodiment, the periphery of the input shaft 1012a, the intermediate shaft 1012b and the output shaft 1012c is respectively coaxially sleeved with at least one gear 1011. The at least one gear 1011 sleeved on each rotating shaft is engaged with each other to achieve the effect that the intermediate shaft 1012b is drive connected between the input shaft 1012a and the output shaft 1012c. The electric motor 103 is used to output power to the outside, and since the motor shaft 1033 is coaxially driven with the input shaft 1012a of the speed reducer 101, when the motor shaft 1033 rotates around its own axis, it will synchronously drive the input shaft 1012a to rotate coaxially, thereby achieving the effect of inputting power into the speed reducer 101.

[0065] It should be noted that in the embodiments shown in FIG. 1 and FIG. 2, a transmission mechanism for achieving other functions can also be provided between the reducer 101 and the wheel 1001 of the electric vehicle 1000, for example, but not limited to, a differential or other transmission mechanism, to achieve different power transmission effects between the reducer 101 and the wheel 1001, to meet different driving states and requirements of the electric vehicle 1000.

[0066] In an embodiment, the electric motor 103 and the generator 102 are electrically connected to the power battery 1002 at the same time.

[0067] For example, the generator 102 is used to convert kinetic energy into electrical energy. The electrical energy generated by the generator 102 is input into the power battery 1002 for storage, to achieve the effect of charging the power battery 1002 by the generator 102. The power battery 1002 is used to transmit electrical energy to the electric motor 103, and convert the electrical energy into kinetic energy by the electric motor 103, and the electric motor 103 transmits the kinetic energy to the wheel 1001 through the reducer 101.

[0068] In an embodiment, the electric vehicle 1000 further comprises an engine 1003, and the engine 1003 is drivingly connected to the generator 102. The engine 1003 is used to provide power and transmit the power to the generator 102 through the transmission mechanism between the engine 1003 and the generator 102, 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 include, but is not limited to, a gasoline engine, a diesel engine, and other types or fuels of engines.

[0069] In an embodiment, the electric vehicle 1000 further comprises a controller 1004, and the controller 1004 is electrically connected to the power battery 1002, the electric motor 103 and the generator 102 respectively. The controller 1004 is used to control the coordinated work between the power battery 1002, the electric motor 103 and the generator 102, to make the electric vehicle 1000 run normally and to make the electric vehicle 1000 work in different power modes.

[0070] 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 electrical energy to the power battery 1002 of the electric vehicle 1000 through a generator 102, and drive the motor shaft 1033 of an electric motor 103 to rotate through the power battery 1002 to be able to input power to the transmission mechanism drivingly connected to 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 drivingly connected to the electric motor 103 in the power assembly 100, thereby achieving the effect of outputting power to the outside of the power assembly 100, and being used to achieve the function of driving the electric vehicle 1000.

[0071] It should be noted that in the embodiments shown in FIG. 1 and FIG. 2, only a possible functional structure of the electric vehicle 1000 and the power assembly 100 provided in the embodiments of the present application and the possible structure shape, size and arrangement position of each functional structure are exemplarily introduced, but the functional structure devices inside the electric vehicle 1000 and the structure shape, size and arrangement position of each functional structure device provided in the embodiments of the present application are not limited to this, and the functional structure devices inside the power assembly 100 and the structure shape, size and arrangement position of each functional structure device provided in the embodiments of the present application are not limited to this. In other embodiments of the present application, the structure shape, size and arrangement position of the functional structure devices inside 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.

[0072] Referring to FIG. 3, FIG. 3 is a plan view of the internal flow channel 10 of the power assembly 100 provided in the embodiments of the present application for conveying cooling liquid. In the embodiment shown in FIG. 3, the power assembly 100 includes a plurality of internal flow channels 10, a housing 105 and an oil pump 20.

[0073] Exemplarily, the internal flow channel 10 is communicated between a plurality of functional structures inside the power assembly 100, for conveying cooling liquid 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. In the embodiment shown in FIG. 3, the plurality of internal flow channels 10 includes an electric motor flow channel 11 and a generator flow channel 12.

[0074] The electric motor flow channel 11 is used to output cooling liquid to the electric motor side, so as to be able to convey cooling liquid to dissipate heat of at least one of the stator or the rotor of an electric motor 103, or to lubricate at least one of a gear, a bearing of a transmission mechanism such as a reducer 101, a differential, etc. which is in transmission connection with the electric motor 103.

[0075] In the embodiments of the present application, the transmission mechanism of the electric motor side of the power assembly 100 is exemplarily introduced by taking the reducer 101 as an example.

[0076] Specifically, one motor flow channel 11 includes at least one motor flow channel inlet 111 and at least one motor flow channel outlet 112, the at least one motor flow channel inlet 111 is used to receive the cooling liquid, and the cooling liquid is outputted through the at least one motor flow channel outlet 112 to each functional structure on the motor side to dissipate heat or cool. That is, one or more of the at least one motor flow channel outlet 112 is used to output the cooling liquid to dissipate heat for at least one of the rotor or the stator of the motor 103, and one or more of the at least one motor flow channel outlet 112 is used to output the cooling liquid to lubricate at least one of a gear or a bearing in the speed reducer 101.

[0077] One generator flow channel 12 is used to output the cooling liquid to the motor side, so as to be able to transport the cooling liquid to dissipate heat for at least one of the rotor or the stator of the generator 102, or to be able to lubricate at least one of a gear or a bearing of a transmission mechanism in driving connection with the generator 102, which is the generator-side transmission mechanism 104 in FIG. 3. Among them, the generator side of the power assembly 100 can be understood as the generator 102 in the power assembly 100, and the transmission mechanism in driving connection with the generator 102, which is referred to as the generator side in the specification of the present application.

[0078] Specifically, one generator flow channel 12 includes at least one generator flow channel inlet 121 and at least one generator flow channel outlet 122, one generator flow channel inlet 121 is used to receive the cooling liquid, and the cooling liquid is outputted through the at least one generator flow channel outlet 122 to each functional structure on the generator side to dissipate heat or cool. That is, one or more of the at least one generator flow channel outlet 122 is used to output the cooling liquid to dissipate heat for at least one of the rotor or the stator of the generator 102, and one or more of the at least one generator flow channel outlet 122 is used to output the cooling liquid to lubricate at least one of a gear or a bearing in the generator-side transmission mechanism 104.

[0079] The housing 105 includes an oil pool 105a, which is used to accommodate the cooling liquid transported by the internal flow channel 10 to each functional structure of the power assembly 100 and to complete lubrication or heat dissipation for each functional structure of the power assembly 100 (as shown by the dotted line in FIG. 3), that is, the cooling liquid after completing lubrication or heat dissipation in the power assembly 100 is accommodated in the oil pool 105a of the housing 105.

[0080] One oil pump 20 is used to provide negative pressure and suck the cooling liquid from the oil pool 105a, and the cooling liquid outputted by the oil pump 20 is transported to each functional structure for lubrication or heat dissipation through the internal flow channel 10.

[0081] Specifically, the inlet of one oil pump 20 is communicated with the oil pool 105a of the housing 105 through at least one internal flow channel 10, and the outlet of one oil pump 20 is communicated with one motor flow channel 11 and one generator flow channel 12. As shown in FIG. 3, the outlet of one oil pump 20 is used to communicate with at least one motor flow channel inlet 111 and at least one generator flow channel inlet 121.

[0082] One oil pump 20 sucks the coolant in the housing 105 and respectively delivers to one motor flow channel 11 for heat dissipation or lubrication of the functional structure on the motor side, or to one generator flow channel 12 for heat dissipation and lubrication of the functional structure on the generator side.

[0083] It can be understood that the power assembly 100 delivers the coolant to the motor side through one motor flow channel 11 for lubrication or heat dissipation, and delivers the coolant to the generator side through one generator flow channel 12 for lubrication or heat dissipation, which can ensure that one motor 103 and one generator 102 work at a suitable working temperature and have good lubrication effect, so as to improve the working performance and service life of one motor 103 and one generator 102, and further improve the working performance and service life of the whole power assembly 100.

[0084] In one embodiment, the power assembly 100 further comprises one heat exchanger 106 and at least one filter 107. In the embodiment shown in FIG. 3, before the coolant flows into one or more motor flow channel inlets 111 and one or more generator flow channel inlets 121, the coolant also flows through one heat exchanger 106 and one filter 107.

[0085] In the embodiment shown in FIG. 3, along the direction of the coolant flow, one heat exchanger 106 and one filter 107 are further arranged between one oil pump 20 and one or more motor flow channel inlets 111 and one or more generator flow channel inlets 121, one heat exchanger 106 is used to exchange heat of the coolant to reduce the temperature of the coolant and output, and one filter 107 is used to filter impurities or foreign matters that may be mixed into the coolant to improve the cleanliness of the coolant.

[0086] It can be understood that by arranging one heat exchanger 106 and one filter 107 on the outlet side of one oil pump 20 along the direction of the coolant flow, the coolant output by the outlet of one oil pump 20 is exchanged by one heat exchanger 106 to reduce the temperature of the coolant before being delivered to one motor flow channel 11 for lubrication or heat dissipation of the motor side, and one generator flow channel 12 for lubrication or heat dissipation of the generator side, which can ensure the heat dissipation efficiency of the coolant to the generator side or the motor side, and further ensure that one generator 102 or one motor 103 works at a suitable temperature, so as to further improve the working performance and service life of one generator 102 or one motor 103.

[0087] At the same time, the impurities or foreign matters such as dust and abrasive particles possibly mixed in the cooling liquid are filtered by a filter 107 to improve the cleanliness of the cooling liquid, so that the impurities or foreign matters possibly mixed in the cooling liquid 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 cooling liquid lubricates the generator side or the motor side. That is, the cooling liquid output by the oil pump 20 is further flowed through a heat exchanger 106 and a filter 107 before being delivered to the engine side or the motor side for lubrication or heat dissipation, so that the working performance and service life of the power assembly 100 can be further improved.

[0088] In one embodiment, the at least one filter 107 includes two filters 107, and the pore size of the filter screen in one filter 107 is smaller than that in the other filter 107.

[0089] In the embodiment shown in FIG. 3, the filter 107 with the relatively smaller pore size of the filter screen is the first filter 1071, and the filter 107 with the relatively larger pore size of the filter screen is the second filter 1072.

[0090] Specifically, along the direction of the flow of the cooling liquid, the filter 107 with the relatively larger pore size of the filter screen is arranged on the side of the inlet of the oil pump 20 away from the outlet of the oil pump 20, and the filter 107 with the relatively smaller pore size of the filter screen is arranged on the side of the outlet of the oil pump 20 away from the inlet of the oil pump 20, so that the cooling liquid is filtered by the filter 107 with the relatively larger pore size of the filter screen before flowing into the oil pump 20. As shown in FIG. 3, along the direction of the flow of the cooling liquid, the cooling liquid flowing from the oil pool 105a of the housing 105 to the plurality of functional structural members of the power assembly 100 is sequentially flowed through the second filter 1072, the oil pump 20, the heat exchanger 106, and the first filter 1071.

[0091] It can be understood that the filter 107 with the relatively larger pore size of the filter screen can filter the impurities or foreign matters with relatively large size such as volume and outer diameter possibly mixed in the cooling liquid, so as to achieve the effect of rough filtration of the filter 107 and prevent the impurities or foreign matters with relatively large size possibly mixed in the filter 107 from damaging the oil pump 20, that is, the filter 107 with the relatively larger pore size of the filter screen can protect the oil pump 20 to improve the working performance and service life of the oil pump 20.

[0092] Meanwhile, the two filters 107 have different filter screen pore sizes, so that the two filters 107 complement and cooperate when filtering the coolant, to further improve the filtering effect on the coolant.

[0093] It should be noted that in the embodiment shown in FIG. 3, only one possible embodiment of the several internal flow channels 10 in the power assembly 100 of the present application is exemplarily introduced, but the layout, communication mode, structure shape and size of the several internal flow channels 10 provided in the embodiments of the present application are not limited to this. In other embodiments of the present application, the layout, communication mode, structure shape and size of each internal flow channel 10 can be adjusted according to actual design requirements, which are not specifically limited in the embodiments of the present application.

[0094] Meanwhile, in the embodiment shown in FIG. 3, only one possible arrangement mode, relative position relationship, structure shape and size of each functional structural member in the power assembly 100 of the present application are exemplarily introduced, but the actual layout position, actual structure shape and size of each functional structural member 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 actual layout position, actual structure shape and size of each functional structural member in the power assembly 100 can be adjusted according to actual design requirements, which are not specifically limited in the embodiments of the present application.

[0095] Please refer to FIG. 4 and FIG. 5 together, FIG. 4 is a planar structure schematic view of the power assembly 100 provided in the embodiments of the present application, in which part of the structure is hidden, showing the delivery of coolant by one motor flow channel 11 and one generator flow channel 12, and FIG. 5 is a planar structure schematic view of the power assembly 100 provided in the embodiments of the present application, showing the delivery of coolant by one motor flow channel 11 and one generator flow channel 12. In order to clearly show the communication relationship between one valve, one motor flow channel 11 and one generator flow channel 12 in the power assembly 100, in the embodiments shown in FIG. 4 and FIG. 5, part of the functional structures in the power assembly 100 such as one oil pump 20 and one heat exchanger 106 are hidden.

[0096] As shown in FIG. 4 and FIG. 5, the power assembly 100 further comprises one valve 30. The valve 30 is used to communicate one or more motor flow channel inlets 111 and one or more motor flow channel outlets 112, and is used to simultaneously adjust the flow of one or more motor flow channel outlets 112 and one or more generator flow channel outlets 122.

[0097] As shown in FIG. 4 and FIG. 5, the number of motor flow channel inlets 111 of one motor flow channel 11 is one or more, and each motor flow channel inlet 111 is in communication with one or more motor flow channel outlets 112, i.e. the cooling liquid output by the outlet of one oil pump 20 is simultaneously output to one or more motor flow channel outlets 112 through each motor flow channel inlet 111, and the one or more motor flow channel outlets 112 are used to dissipate heat from at least one of the stator or rotor on the motor side of the power assembly 100.

[0098] The number of generator flow channel inlets 121 of one generator flow channel 12 is one or more, and each generator flow channel inlet 121 is in communication with one or more generator flow channel outlets 122, i.e. the cooling liquid output by the outlet of one oil pump 20 is simultaneously output to one or more generator flow channel outlets 122 through each generator flow channel inlet 121, and the one or more generator flow channel outlets 122 are used to dissipate heat from at least one of the stator or rotor on the generator side.

[0099] One valve 30 is arranged on one motor flow channel 11, so that one or more motor flow channel inlets 111 of one motor flow channel 11 can be in communication with one or more motor flow channel outlets 112 through one valve 30, thereby realizing the effect of one valve 30 controlling the delivery of cooling liquid from one or more motor flow channel inlets 111 to one or more motor flow channel outlets 112, and adjusting the flow of cooling liquid output by one or more motor flow channel outlets 112 through one valve 30.

[0100] At the same time, since one motor flow channel 11 and one generator flow channel 12 are connected in parallel, one or more motor flow channel outlets 112 of one motor flow channel 11 and one or more generator flow channel outlets 122 of one generator flow channel 12 are also arranged in parallel. When one valve 30 adjusts the flow of one or more motor flow channel outlets 112, it will simultaneously adjust the flow of cooling liquid output by one or more generator flow channel outlets 122.

[0101] Generally, the efficiency of cooling liquid flow distribution in each internal flow channel of the power assembly is not high, and the cooling liquid flow distribution in each internal flow channel cannot be adaptively adjusted for various working conditions of the power assembly, resulting in cooling liquid loss and increased overall energy consumption of the power assembly.

[0102] The power assembly 100 adjusts the flow of the coolant output by the one or more motor flow channel outlets 112 and the one or more generator flow channel outlets 122 through the valve 30 simultaneously, so as to realize independent adjustment of the one or more motor flow channel outlets 112 and the one or more generator flow channel outlets 122 in the power assembly 100, so that the flow of the coolant output by the outlet of each internal flow channel 10 in the power assembly 100 can be reasonably distributed, and each internal flow channel 10 in the power assembly 100 can adjust the flow of the coolant output adaptively for different working conditions of the power assembly 100, thereby improving the utilization rate of the coolant to reduce the loss of the coolant, reducing the power consumption of the power assembly 100 while improving the overall working performance and service life of the power assembly 100.

[0103] The electric vehicle 1000 provided in any of the above embodiments is provided with the power assembly 100, so as to improve the working performance and service life of the electric vehicle 1000. That is, because the power assembly 100 in any of the above embodiments is used, the electric vehicle 1000 provided in any of the above embodiments has all the beneficial effects that the power assembly 100 provided in any of the above embodiments can have.

[0104] In one embodiment, each motor flow channel inlet 111 is configured to transmit the coolant to the one or more motor flow channel outlets 112, and each generator flow channel inlet 121 is configured to transmit the coolant to the one or more generator flow channel outlets 122.

[0105] In the embodiments shown in FIGS. 4 and 5, the number of the at least one motor flow channel inlet 111 of the one motor flow channel 11 is one, and the one motor flow channel inlet 111 transmits the coolant to the one or more motor flow channel outlets 112 simultaneously.

[0106] Specifically, the at least one motor flow channel outlet 112 includes at least one first motor flow channel outlet 112a (as shown by the thick solid line in FIGS. 4 and 5) and at least one second motor flow channel outlet 112b (as shown by the thin dotted line in FIGS. 4 and 5). The number of the at least one first motor flow channel outlet 112a is one or more, and the one or more first motor flow channel outlets 112a are configured to output the coolant to at least one of the stator or the rotor of the motor 103 on the motor side of the power assembly 100.

[0107] The number of the at least one second motor flow channel outlet 112b is one or more, and the one or more second motor flow channel outlets 112b are configured to output the coolant to at least one of the gear or the bearing in the speed reducer 101 on the motor side of the power assembly 100.

[0108] A valve 30 is connected in series at the rear end of the motor flow channel inlet 111 and the front end of the motor flow channel outlet 112.

[0109] The number of at least one generator flow channel inlet 121 of a generator flow channel 12 is one, and one generator flow channel inlet 121 can simultaneously transmit cooling liquid to one or more generator flow channel outlets 122.

[0110] Specifically, the at least one generator flow channel outlet 122 includes at least one first generator flow channel outlet 122a (as shown by the thick solid line in FIGS. 4 and 5) and at least one second generator flow channel outlet 122b (as shown by the thin dotted line in FIGS. 4 and 5).

[0111] The number of at least one first generator flow channel outlet 122a is one or more, and the one or more first generator flow channel outlets 122a are used to output cooling liquid to at least one of the stator or the rotor of one generator 102 on the generator side of the power assembly 100. The number of at least one second generator flow channel outlet 122b is one or more, and the one or more second generator flow channel outlets 122b are used to output cooling liquid to at least one of one gear or one bearing in the transmission mechanism 104 on the generator side of the power assembly 100.

[0112] It can be understood that the cooling liquid output by the outlet of the oil pump 20 is respectively transmitted to the motor side of the power assembly 100 through one motor flow channel inlet 111 for heat dissipation or lubrication, and one generator flow channel inlet 121 for heat dissipation or lubrication, so that the parallel effect is formed between the inlets of each internal flow channel 10 for delivering cooling liquid to each motor side for heat dissipation or lubrication.

[0113] Therefore, when one valve 30 adjusts the flow of one or more motor flow channel outlets 112 of one motor flow channel 11, one valve 30 can synchronously adjust the flow of one or more outlets of other internal flow channels 10 connected in parallel with one motor flow channel 11 according to different working conditions of the power assembly 100, so that the cooling liquid output by the outlet of each internal flow channel 10 can be accurately output according to different working conditions of the power assembly 100, thereby further improving the utilization rate of the cooling liquid.

[0114] In one embodiment, one valve 30 can be but is not limited to a proportional electromagnetic valve.

[0115] In one embodiment, the flow distance of the cooling liquid output by one oil pump 20 from the outlet of one oil pump 20 to each generator flow channel inlet 121 is greater than the flow distance from the outlet of one oil pump 20 to each motor flow channel inlet 111.

[0116] In the embodiment shown in FIG. 4 and FIG. 5, the number of the motor flow channel inlets 111 is one, the number of the generator flow channel inlets 121 is one, and the motor flow channel inlets 111 and the generator flow channel inlets 121 are arranged in the direction of the flow of the coolant output by the oil pump 20, and the motor flow channel inlets 111 are located between the outlet of the oil pump 20 and the generator flow channel inlets 121.

[0117] That is, the motor flow channel inlets 111 are closer to the outlet of the oil pump 20 than the generator flow channel inlets 121, so that the coolant output by the outlet of the oil pump 20 first flows into the motor flow channel 11 from the motor flow channel inlets 111 and then flows into the generator flow channel 12 from the generator flow channel inlets 121.

[0118] It can be understood that, since the motor in the power assembly 100 is used to generate power and is used to output power through the transmission mechanism such as the reducer 101, the differential, etc., the motor side in the power assembly 100 generates more heat than the generator side, and there are more functional structural components inside the transmission mechanism.

[0119] In the direction of the flow of the coolant output by the oil pump 20, by arranging the coolant output by the outlet of the oil pump 20 to first flow into the motor flow channel inlet 111 and then be transmitted to the generator flow channel inlet 121, the coolant output by the outlet of the oil pump 20 can be transported to the motor side for heat dissipation or lubrication earlier, so that more coolant is distributed to the motor side from the motor flow channel inlet 111, to ensure the heat dissipation and lubrication effect of the coolant on the motor side, thereby improving the utilization rate of the coolant and further improving the working performance and service life of the power assembly 100 as a whole.

[0120] An embodiment, please refer to FIG. 6, which is a partial planar structure schematic diagram of the internal flow channel 10 of the power assembly 100 provided by the embodiment of the present application. As shown in FIG. 6, the aperture of each motor flow channel inlet 111 is larger than the aperture of each generator flow channel inlet 121. For example, in FIG. 6, the aperture of each motor flow channel inlet 111 is shown as a first aperture D1, and the aperture of each generator flow channel inlet 121 is shown as a second aperture D2. Wherein, the first aperture D1 is larger than the second aperture D2.

[0121] The greater the aperture of each internal flow channel 10 inlet, the smaller the resistance to the cooling liquid at each internal flow channel 10 inlet. Therefore, by setting the aperture of each motor flow channel inlet 111 to be greater than the aperture of each generator flow channel inlet 121, the cooling liquid output by one oil pump 20 is more easily transmitted into each motor flow channel inlet 111, and thus one oil pump 20 is able to distribute more cooling liquid to the motor side through one motor flow channel 11 to cool and lubricate the motor side, which has greater cooling and lubrication requirements, at a constant rotational speed.

[0122] That is, on the basis of simultaneously adjusting the flow of one or more motor flow channel outlets 112 and the flow of one or more generator flow channel outlets 122 by one valve 30, by differentiating the aperture of each motor flow channel inlet 111 and the aperture of each generator flow channel inlet 121, the cooling liquid output by one oil pump 20 can be further reasonably and targetedly distributed according to the different cooling and lubrication requirements of each motor in the power assembly 100, further improving the utilization rate of the cooling liquid, reducing the loss of the cooling liquid, and reducing the overall power consumption of the power assembly 100.

[0123] In one embodiment, one valve 30 adjusts the opening degree of one valve 30 at a constant rotational speed of one oil pump 20.

[0124] For example, the opening degree of one valve 30 is increased, and the flow of one or more motor flow channel outlets 112 is increased and the flow of one or more generator flow channel outlets 122 is reduced.

[0125] For example, the opening degree of one valve 30 is reduced, and the flow of one or more motor flow channel outlets 112 is reduced and the flow of one or more generator flow channel outlets 122 is increased.

[0126] It can be understood that, since one valve 30 can connect one or more motor flow channel inlets 111 and one or more motor flow channel outlets 112, one valve 30 forms the effect of being connected in series to one motor flow channel 11. Therefore, when the opening degree of one valve 30 is adjusted, one valve 30 can adjust and control the flow of one or more motor flow channel outlets 112 of one motor flow channel 11, thereby achieving the effect of one valve 30 synchronously adjusting the flow of one or more motor flow channel outlets 112.

[0127] And, since the one or more motor flow channel inlets 111 and the one or more generator flow channel inlets 121 are in parallel, when the valve 30 adjusts the flow of the one or more motor flow channel outlets 112, the valve 30 will simultaneously adjust the flow of the one or more generator flow channel outlets 122 under the premise that the rotational speed of the oil pump 20 remains unchanged. When the valve 30 synchronously adjusts the flow of the one or more motor flow channel outlets 112 and the flow of the one or more generator flow channel outlets 122, the cooling liquid output by the motor flow channel 11 and the generator flow channel 12 can be adjusted according to different working conditions of the power assembly 100.

[0128] That is, the cooling liquid output by the motor flow channel 11 and the generator flow channel 12 is more targeted and adaptive when dissipating heat or lubricating functional structural members in the power assembly 100, so as to further improve the utilization rate of the cooling liquid and reduce the loss of the cooling liquid and the overall power consumption of the power assembly 100.

[0129] In one embodiment, under the premise that the rotational speed of the oil pump 20 remains unchanged, the flow of each motor flow channel outlet 112 changes by different amounts with the adjustment of the opening degree of the valve 30.

[0130] Since each motor flow channel outlet 112 outputs cooling liquid to lubricate or dissipate heat for different functional structural members on the motor side, and different functional structural members in the motor side have different heat dissipation or lubrication requirements, each functional structural member on the motor side has different cooling liquid requirements. Therefore, under the premise that the rotational speed of the oil pump 20 remains unchanged, the valve 30 adjusts the opening degree of the valve 30 to make the flow of cooling liquid output by each motor flow channel outlet 112 change by different amounts, so that the cooling liquid output by each motor flow channel outlet 112 can meet the cooling liquid requirements of each functional structural member on the motor side, further improving the precise and reasonable distribution effect of the valve 30 on the cooling liquid output by the one or more motor flow channel outlets 112.

[0131] In the embodiments of the present application, only under the premise that the rotating speed of the oil pump 20 is constant, the adjustment of the opening degree of the valve 30 to adjust the variation of the outlet 112 of each motor flow channel is exemplarily introduced. However, the adjustment of the opening degree of the valve 30 to adjust the variation of the outlet 112 of each motor flow channel in the embodiments of the present application is not limited, and is also under the premise that the rotating speed of the oil pump 20 is constant. In other embodiments of the present application, the rotating speed of the oil pump 20 can also be adjusted in cooperation with the working condition of at least one of the motor 103 and the generator 102, that is, the rotating speed of the valve 30 and the oil pump 20 are cooperated with each other, so as to further improve the utilization rate of the coolant, reduce the loss of the coolant and the power consumption of the whole power assembly 100, while ensuring the working performance and service life of the motor side and the generator side of the power assembly 100.

[0132] Please refer to FIG. 7 in combination with FIG. 5, FIG. 7 is a schematic diagram of the working principle of the valve 30 of the power assembly 100 provided by the embodiments of the present application. As shown in FIG. 5 and FIG. 7, the valve 30 is used to adjust the opening degree of the valve 30 according to the working condition of at least one of the motor 103 or the generator 102.

[0133] In one embodiment, the valve 30 can adjust the opening degree of the valve 30 according to the working condition of the motor 103, but is not limited thereto.

[0134] Specifically, when at least one of the rotating speed or the torque of the motor 103 increases from a first preset value to a second preset value, the opening degree of the valve 30 is adjusted from a first opening degree to a second opening degree, and the first opening degree is smaller than the second opening degree. The preset value can be understood as at least one of a preset rotating speed value or a preset torque value, but is not limited thereto.

[0135] It can be understood that when the rotating speed or the torque of the motor 103 increases, the heat generation of the motor 103 increases, and therefore the demand for heat dissipation and lubrication of the motor side of the power assembly 100 also increases. At the same time, since the valve 30 is connected in series to the motor flow channel 11, and the motor flow channel inlet 111 is used to simultaneously provide the coolant to the one or more first motor flow channel outlets 112a and the one or more second motor flow channel outlets 112b, when the opening degree of the valve 30 increases, the flow of the one or more first motor flow channel outlets 112a and the one or more second motor flow channel outlets 112b also increases, so as to meet the heat dissipation demand of the stator or the rotor of the motor 103, and meet the lubrication demand of the gear or the bearing in the reducer 101.

[0136] In other words, the heat dissipation requirement of the stator and the rotor of the motor 103, and the lubrication requirement of the gear and the bearing in the motor side reducer 101 are different when the output rotation speed or the output torque of the motor 103 is different. Therefore, the valve 30 adjusts the opening degree of the valve 30 based on the change of at least one of the output rotation speed or the output torque of the motor 103, so that the cooling liquid output by the motor flow channel outlet 112 meets the requirement of the motor 103 under different working conditions. While ensuring that the cooling liquid output by the motor flow channel 11 meets the basic heat dissipation or lubrication requirement of the motor side functional structure, the accuracy and reasonable distribution effect of the valve 30 adjusting the cooling liquid output by the motor flow channel outlet 112 is further improved.

[0137] At the same time, since the motor flow channel inlet 111 of the motor flow channel 11 and the generator flow channel inlet 121 of the generator flow channel 12 are in parallel, when the valve 30 increases or decreases the flow of the cooling liquid distributed into the motor flow channel inlet 111 based on the rotation speed or the torque of the motor 103, at this time, the rotation speed of the oil pump 20 can be synchronized, for example, but not limited to, the valve 30 increases the flow of the cooling liquid in the motor flow channel 11, and at the same time, the rotation speed of the oil pump 20 is increased, so that the heat dissipation and lubrication requirement of the cooling liquid to the motor side of the power assembly 100 is ensured, and at the same time, the heat dissipation and lubrication requirement of the cooling liquid to the generator side of the power assembly 100 is ensured by increasing the rotation speed of the oil pump 20. That is, by adjusting the opening degree of the valve 30 and synchronously adjusting the rotation speed of the oil pump 20, the utilization rate of the cooling liquid can be further improved, the loss of the cooling liquid is reduced, and the overall loss of the power assembly 100 is reduced.

[0138] For example, when the rotation speed of the motor 103 is less than or equal to 8000 rpm-120000 rpm, and the torque of the motor 103 is less than or equal to 150 N.m-200 N.m, the opening degree of the valve 30 is adjusted between 0-100%.

[0139] It can be understood that when the motor 103 works in a low load working mode, the heat generated by the stator and the rotor in the motor 103 is relatively small, and therefore the heat dissipation and lubrication requirement of the motor side of the power assembly 100 is relatively low. At this time, the opening degree of the valve 30 is adjusted between 0-100%, which can appropriately reduce the flow of the cooling liquid output by the motor flow channel outlet 112 based on the heat dissipation and lubrication requirement of the motor side of the power assembly 100, so as to avoid waste of the cooling liquid when the heat dissipation and lubrication requirement of the motor side of the power assembly 100 is not high, so as to reduce the loss of the cooling liquid and improve the utilization rate of the cooling liquid.

[0140] For example, when the rotational speed of one motor 103 is greater than 8000 rpm-120000 rpm and the torque of one motor 103 is greater than 150 N.m-200 N.m, the opening degree of one valve 30 is adjusted to 100%.

[0141] It can be understood that when one motor 103 works in the high load working mode, the heat generated by the stator and the rotor in one motor 103 is relatively large, and therefore the motor side of the power assembly 100 has relatively large demands for heat dissipation and lubrication. At this time, the opening degree of one valve 30 is adjusted to 100%, so that the flow of the cooling liquid output by the motor flow channel outlet 112 can meet the demands of the motor side of the power assembly 100 for heat dissipation and lubrication, so as to fully ensure the heat dissipation effect of at least one of the stator or the rotor of one motor 103 and the lubrication effect of at least one of one gear or one bearing in the speed reducer 101, and further improve the working performance and the service life of the power assembly 100.

[0142] In one embodiment, when at least one of the rotational speed or the torque of one motor 103 is less than or equal to a fifth preset value, the opening degree of one valve 30 is maintained at a fifth opening degree, the fifth preset value is less than the first preset value, and the fifth opening degree is less than the first opening degree.

[0143] It can be understood that when at least one of the rotational speed or the torque of one motor 103 decreases, that is, the load of one motor 103 is further reduced compared with the low load mode, the demands of the motor side of the power assembly 100 for heat dissipation and lubrication will be further reduced. At this time, by adjusting the fifth opening degree of one valve 30 to be less than the first opening degree, that is, by further reducing the opening degree of one valve 30, the flow of the cooling liquid output by the motor flow channel outlet 112 can be further reduced based on the demands of the motor side of the power assembly 100 in this working mode for heat dissipation and lubrication, so that the flow of the cooling liquid output by the motor flow channel outlet 112 can be further matched with the working condition of one motor 103 in the power assembly 100, and the loss of the cooling oil is further reduced.

[0144] In one embodiment, one valve 30 can but is not limited to adjusting the opening degree of one valve 30 according to the working condition of one generator 102.

[0145] Specifically, when at least one of the rotational speed or the torque of one generator 102 decreases from the third preset value to the fourth preset value, the opening degree of one valve 30 is adjusted from the third opening degree to the fourth opening degree, and the third opening degree is greater than the fourth opening degree.

[0146] It can be understood that when the rotating speed or torque of a generator 102 decreases, the heat generated by a generator 102 decreases, and thus the demand for heat dissipation and lubrication of the generator side of the power assembly 100 also decreases. At this time, when the opening degree of a valve 30 is adjusted from the third opening degree to the fourth opening degree, that is, the opening degree of a valve 30 decreases, the valve 30 adjusts the flow of one or more generator flow passage outlets 122 of a generator flow passage 12 to increase the flow of the cooling liquid output by one or more first generator flow passage outlets 122a and one or more second generator flow passage outlets 122b at the same time, so as to be able to meet the heat dissipation demand of the stator or rotor of a generator 102 and the lubrication demand of a gear or a bearing in the transmission mechanism 104 of the generator side.

[0147] In an embodiment, a valve 30 can but is not limited to adjusting the opening degree of the valve 30 according to the working conditions of a generator 102 and a motor 103.

[0148] For example, when the rotating speed of a motor 103 is 0 and the rotating speed of a generator 102 is greater than 0. That is, when a motor 103 is stationary and a generator 102 works in the mode of charging the power battery, a valve 30 adjusts the opening degree of the valve 30 to 0.

[0149] One or more motor flow passage outlets 112 of a motor flow passage 11 output cooling liquid for heat dissipation or lubrication of the motor side, one or more generator flow passage outlets 122 of a generator flow passage 12 output cooling liquid for heat dissipation or lubrication of the generator side, and a valve 30 is connected in series to a motor flow passage 11. Since a motor 103 does not work and a generator 102 charges the power battery, at this time, the motor side of the power assembly 100 does not need to input cooling liquid for heat dissipation or lubrication, and the demand for heat dissipation and lubrication of the generator side increases. Therefore, by adjusting the opening degree of a valve 30 to 0, the cooling liquid in a motor flow passage 11 can be completely distributed to a generator flow passage 12 under the condition that the rotating speed of an oil pump 20 does not change, so that the cooling liquid output by the outlet of an oil pump 20 is completely delivered to the generator side of the power assembly 100 for heat dissipation or lubrication.

[0150] In an embodiment, please refer to FIG. 8 in combination with FIG. 5, FIG. 8 is a schematic diagram of the working principle of a valve 30 of the power assembly 100 provided in the embodiment of the application. As shown in FIG. 5 and FIG. 8, when the temperature of a motor 103 is greater than a preset temperature value, the opening degree of a valve 30 remains the sixth opening degree, which is less than or equal to the second opening degree.

[0151] Specifically, the power assembly 100 further comprises a temperature sensor 108, which can but is not limited to monitor the temperature of the stator winding end of the stator of the motor 103. The valve 30 adjusts the opening degree of the valve 30 based on the temperature of the stator winding end of the stator.

[0152] For example, the temperature sensor 108 and the valve 30 can be electrically connected to the controller 1004, the temperature sensor 108 is used to transmit the temperature signal of the stator winding end to the controller 1004 in real time, and the valve 30 is used to receive the signal of the controller 1004 and adjust the opening degree of the valve 30. When the temperature sensor 108 monitors that the temperature of the stator winding end is greater than or equal to 130-140℃, the valve 30 adjusts the opening degree of the valve 30 to 100%.

[0153] It can be understood that the operation of the motor 103 at an appropriate temperature can ensure the working performance and service life of the motor 103, and therefore, on the basis of adjusting the flow of the motor flow channel outlet 112 with at least one of the output speed or the output torque of the motor 103 as a reference condition, further increasing the temperature of the motor 103 during operation as a reference condition to adjust the flow of the motor flow channel outlet 112 can further improve the precise and reasonable distribution effect of the valve 30 in adjusting the cooling liquid output by the motor flow channel outlet 112, so that the cooling liquid output by the motor flow channel outlet 112 can adapt to different working states of the power assembly 100, while ensuring the working performance and service life of the power assembly 100, further reducing the overall power consumption of the power assembly 100.

[0154] Please refer to Figures 9 and 10, Figure 9 is a planar structure schematic diagram of the power assembly 100 provided by the embodiment of the application, which shows the delivery of cooling liquid by the motor flow channel 11 and the generator flow channel 12 after the hidden part of the structure, and Figure 10 is a planar structure schematic diagram of the power assembly 100 provided by the embodiment of the application, which shows the delivery of cooling liquid by the motor flow channel 11 and the generator flow channel 12. In order to clearly show the communication relationship between the valve 30, the motor flow channel 11 and the generator flow channel 12 in the power assembly 100, etc., in the embodiments shown in Figures 9 and 10, some functional structures in the power assembly 100 such as the oil pump 20 and the heat exchanger 106 are hidden.

[0155] In the embodiments shown in Figures 9 and 10, the other or the other motor flow channel outlet 112 of the at least one motor flow channel outlet 112 is used to output cooling liquid to lubricate at least one of the bearings or the reducer 101 of the motor 103.

[0156] Specifically, one motor flow passage inlet 111 is configured to communicate with one or more motor flow passage outlets 112, and another motor flow passage inlet 111 is configured to communicate with another or more motor flow passage outlets 112. As shown in FIG. 9 and FIG. 10, one or more motor flow passage outlets 112 are configured to output cooling liquid to dissipate heat from at least one of a stator or a rotor of one motor 103 on the motor side of the power assembly 100, and another or more motor flow passage outlets 112 are configured to output cooling liquid to lubricate at least one gear and at least one bearing of the reducer 101 or the bearing of one motor 103.

[0157] In which, one motor flow passage inlet 111 is schematically shown as a first motor flow passage inlet 111a in FIG. 9 and FIG. 10, another motor flow passage inlet 111 is schematically shown as a second motor flow passage inlet 111b in FIG. 9 and FIG. 10, one or more motor flow passage outlets 112 are schematically shown as first motor flow passage outlets 112a in FIG. 9 and FIG. 10, and another or more motor flow passage outlets 112 are schematically shown as second motor flow passage outlets 112b in FIG. 9 and FIG. 10.

[0158] That is, one first motor flow passage inlet 111a is configured to communicate with one or more first motor flow passage outlets 112a, and the one first motor flow passage inlet 111a is configured to provide cooling liquid to the one or more first motor flow passage outlets 112a for heat dissipation. One second motor flow passage inlet 111b is configured to communicate with one or more second motor flow passage outlets 112b, and the one second motor flow passage inlet 111b is configured to provide cooling liquid to the one or more second motor flow passage outlets 112b for lubrication.

[0159] It can be understood that, one part of the at least one motor flow passage outlet 112 is configured to output cooling liquid to dissipate heat from at least one of a stator or a rotor of one motor 103, and another part of the at least one motor flow passage outlet 112 is configured to output cooling liquid to lubricate at least one gear or at least one bearing of the reducer 101 on the motor side, so that the cooling liquid output by the outlet of the oil pump 20 through the one or more motor flow passage inlets 111 can simultaneously dissipate heat from at least one of a stator or a rotor of one motor 103 and lubricate at least one gear or at least one bearing of the reducer 101.

[0160] The cooling liquid can be transmitted to different functional structures in the power assembly 100 through the motor flow passage 11 for lubrication or heat dissipation, which can further improve the protection effect of different functional structures on the motor side of the power assembly 100, and further improve the working performance and service life of the power assembly 100 as a whole.

[0161] Meanwhile, the part of the motor flow channel outlet 112 for heat dissipation of the stator or rotor of the motor 103 is supplied with cooling liquid by one motor flow channel inlet 111, and the other part of the motor flow channel outlet 112 for lubrication of the gear or bearing of the reducer 101 is supplied with cooling liquid by another motor flow channel inlet 111, that is, the cooling liquid for heat dissipation and lubrication on the motor side is supplied by different motor flow channel inlets 111 to achieve the effect of parallel connection of multiple motor flow channel inlets 111 in one motor flow channel 11. Therefore, when one valve 30 adjusts the flow of one or more motor flow channel outlets 112 at the same time, by arranging multiple motor flow channel inlets 111 in parallel, the effect of one valve 30 on reasonable distribution of the flow of one or more motor flow channel outlets 112 under the condition that the rotating speed of one oil pump 20 is unchanged can be improved, and the utilization rate of the cooling liquid is further improved, and the loss of the cooling liquid and the power consumption of the power assembly 100 are reduced.

[0162] In one embodiment, the flow distance from the outlet of one oil pump 20 to one motor flow channel inlet 111 is greater than the flow distance from the outlet of one oil pump 20 to another motor flow channel inlet 111 along the direction of the flow of the cooling liquid output by one oil pump 20.

[0163] In the embodiments shown in FIGS. 9 and 10, along the direction of the flow of the cooling liquid output by one oil pump 20, the cooling liquid output by one oil pump 20 first flows into and is distributed to one or more second motor flow channel outlets 112b from one second motor flow channel inlet 111b, and then flows to one first motor flow channel inlet 111a and is distributed to one or more first motor flow channel outlets 112a.

[0164] Along the direction of the flow of the cooling liquid output by one oil pump 20, by arranging that the cooling liquid output by the outlet of one oil pump 20 first flows into another motor flow channel inlet 111 for output of the cooling liquid for lubrication of the reducer 101, and then is transmitted to one motor flow channel inlet 111 for output of the cooling liquid for heat dissipation of the stator or rotor of one motor 103, the cooling liquid output by the outlet of one oil pump 20 can be transported to the reducer 101 for lubrication earlier, so as to ensure the lubrication effect of the cooling liquid on the reducer 101, and further improve the working performance and service life of the power assembly 100 as a whole while improving the utilization rate of the cooling liquid.

[0165] In one embodiment, when one motor 103 works in the follow-up mode, the opening degree of one valve 30 is adjusted to 0. Wherein, the working of one motor 103 in the follow-up mode can be understood as that the rotating speed of one motor 103 is greater than 0 and the output torque is equal to 0.

[0166] Specifically, when the rotational speed of one motor 103 is greater than 0 and the output torque is equal to 0, the heat dissipation requirement of one motor 103 is relatively small and the lubrication requirement is relatively large at this time. Therefore, by adjusting the opening degree of one valve 30 to 0, more cooling liquid can be distributed to the second motor flow passage inlet 111b and transported from one or more second motor flow passage outlets 112b into the reducer 101 for lubrication.

[0167] Please refer to FIG. 11 in combination with FIG. 10, which is a partial planar structural schematic diagram of the internal flow passage 10 of the power assembly 100 provided in the embodiments of the present application. In the embodiments shown in FIG. 10 and FIG. 11, the aperture of one or more motor flow passage outlets 112 is greater than the aperture of another or another plurality of motor flow passage outlets 112.

[0168] As shown in FIG. 10 and FIG. 11, the number of first motor flow passage outlets 112a is a plurality, and the apertures of each first motor flow passage outlet 112a are equal. The number of second motor flow passage outlets 112b is a plurality, and the apertures of each second motor flow passage outlet 112b are equal. In FIG. 10 and FIG. 11, the aperture of each first motor flow passage outlet 112a is schematically shown as a third aperture D3, and the aperture of each second motor flow passage outlet 112b is schematically shown as a fourth aperture D4. Among them, the third aperture D3 is greater than or equal to the fourth aperture D4.

[0169] The greater the aperture of each internal flow passage 10 outlet, the smaller the flow resistance of the cooling liquid in each internal flow passage 10. Therefore, the aperture of one or more motor flow passage outlets 112 is greater than the aperture of another or another plurality of motor flow passage outlets 112, which can make the cooling liquid more easily distributed to one or more motor flow passage outlets 112 under the premise that the rotational speed of one oil pump 20 remains unchanged.

[0170] By increasing the flow of cooling liquid output by one or more motor flow passage outlets 112, the heat dissipation effect of at least one of the stator or rotor of one motor 103 can be further improved. That is, on the basis of one valve 30 simultaneously adjusting the flow of one or more motor flow passage outlets 112 and the flow of another or another plurality of motor flow passage outlets 112, by differentiating the aperture of one or more motor flow passage outlets 112 and the aperture of another or another plurality of motor flow passage outlets 112, the output flow of the cooling liquid can be further reasonably distributed according to the heat dissipation requirement of the stator and rotor on the motor side and the lubrication requirement of the reducer 101, and the utilization rate of the cooling liquid can be further improved, the loss of the cooling liquid and the power consumption of the power assembly 100 as a whole can be reduced.

[0171] It should be noted that in the embodiment shown in FIG. 11, only the aperture of the one or more first motor flow channel outlets 112a and the aperture of the one or more second motor flow channel outlets 112b are exemplarily introduced, but the apertures of each first motor flow channel outlet 112a and the apertures of each second motor flow channel outlet 112b are not limited to be equal. In other embodiments of the present application, the apertures of each first motor flow channel outlet 112a and the apertures of each second motor flow channel outlet 112b can be adjusted according to actual design requirements, i.e., the apertures of each first motor flow channel outlet 112a can be equal or unequal, and the apertures of each second motor flow channel outlet 112b can be equal or unequal.

[0172] In an embodiment, the valve 30 can be, but is not limited to, any one of a proportional solenoid valve or a switch solenoid valve.

[0173] Referring to FIG. 12, FIG. 12 is a partial planar structural schematic view of the power assembly 100 provided by an embodiment of the present application, showing that one generator flow channel 12 delivers cooling liquid. In order to clearly show the layout positions of at least one generator flow channel inlet 121 and at least one generator flow channel outlet 122 of one generator flow channel 12, in the embodiment shown in FIG. 12, the functional structures such as the oil pump 20, the heat exchanger 106 and the motor flow channel 11 in the power assembly 100 are hidden. As shown in FIG. 12, the other one or more generator flow channel outlets 122 are used to output cooling liquid to lubricate the bearings of the generator 102.

[0174] Specifically, one generator flow channel inlet 121 is used to communicate with the one or more generator flow channel outlets 122, and the other generator flow channel inlet 121 is used to communicate with the other one or more generator flow channel outlets 122.

[0175] In the embodiment shown in FIG. 12, the one or more generator flow channel inlets 121 used to provide cooling liquid to cool at least one of the stator or the rotor of the generator 102 are exemplarily shown as first generator flow channel inlets 121a, and the one or more generator flow channel outlets 122 communicating with the first generator flow channel inlets 121a are exemplarily shown as first generator flow channel outlets 122a. The one or more generator flow channel inlets 121 used to provide cooling liquid to lubricate a gear or a bearing in the transmission mechanism 104 on the generator side are exemplarily shown as second generator flow channel inlets 121b, and the one or more generator flow channel outlets 122 communicating with the second generator flow channel inlets 121b are exemplarily shown as second generator flow channel outlets 122b.

[0176] A first generator flow channel inlet 121a and a second generator flow channel inlet 121b are both in communication with an outlet of the oil pump 20.

[0177] For example, the coolant outputted from the outlet of the oil pump 20 is delivered to one or more first generator flow channel outlets 122a through a first generator flow channel inlet 121, and the coolant is outputted through the one or more first generator flow channel outlets 122a to dissipate heat from at least one of the stator and the rotor of the generator 102.

[0178] For example, the coolant outputted from the outlet of the oil pump 20 is delivered to one or more second generator flow channel outlets 122b through a second generator flow channel inlet 121b, and the coolant is outputted through the one or more second generator flow channel outlets 122b to lubricate a gear or a bearing in the powertrain 104 on the generator side.

[0179] It can be understood that the coolant outputted from the other or additional generator flow channel outlets 122 is used to lubricate a gear or a bearing in the powertrain that is drivingly connected to the generator 102, which can improve the working performance and the service life of the powertrain 104 on the generator side, and further improve the working performance and the service life of the powertrain 100.

[0180] Meanwhile, a part of the generator flow channel outlets used to dissipate heat from the stator or the rotor of the generator 102 are supplied with coolant through a generator flow channel inlet 121, and the other part of the generator flow channel outlets used to lubricate a gear or a bearing in the powertrain that is drivingly connected to the generator 102 are supplied with coolant through another generator flow channel inlet 121, i.e., the coolant used for heat dissipation and lubrication on the generator side is supplied through different generator flow channel inlets, so as to achieve the effect of parallel connection of multiple generator flow channel inlets in the generator flow channel 12.

[0181] Therefore, when the valve 30 adjusts the flow rate of the one or more generator flow channel outlets 122 at the same time, the parallel connection of multiple generator flow channel inlets can improve the effect of the valve 30 on reasonable distribution of the flow rate of the one or more generator flow channel outlets 122 under the condition that the rotating speed of the oil pump 20 is unchanged, and further improve the utilization rate of the coolant, and reduce the loss of the coolant and the power consumption of the powertrain 100.

[0182] In an embodiment, the aperture of the one or more generator flow channel outlets 122 is larger than the aperture of the other or additional generator flow channel outlets 122. In the embodiment shown in FIG. 12, the first generator flow channel outlets 122a are multiple in number, and the apertures of the first generator flow channel outlets 122a are equal. The second generator flow channel outlets 122b are multiple in number, and the apertures of the second generator flow channel outlets 122b are equal.

[0183] wherein the aperture of each first generator flow channel outlet 122a is larger than the aperture of any second generator flow channel outlet 122b.

[0184] It can be understood that, according to the influence of the aperture of the outlet of the internal flow channel 10 on the flow resistance of the cooling liquid, by setting the apertures of the plurality of generator flow channel outlets 122 to be different from the aperture of the other generator flow channel outlet 122 or the apertures of the other generator flow channel outlets 122, the flow rate of the cooling liquid for heat dissipation and the flow rate of the cooling liquid for lubrication can be allocated in a targeted manner based on the different characteristics of the heat dissipation and lubrication requirements of the generator side, further improving the reasonable allocation effect of the output flow rate of the cooling liquid.

[0185] In one embodiment, the flow distance from the outlet of the oil pump 20 to the generator flow channel inlet 121 is greater than the flow distance from the outlet of the oil pump 20 to the other generator flow channel inlet 121 in the direction of the cooling liquid flow output by the oil pump 20.

[0186] In the direction of the cooling liquid flow output by the oil pump 20, by setting the cooling liquid output by the outlet of the oil pump 20 to first flow into the other generator flow channel inlet 121 for outputting the cooling liquid for lubricating the transmission mechanism 104 of the generator side, and then transmitted to the generator flow channel inlet 121 for outputting the cooling liquid for heat dissipation of the stator or rotor of the generator 102, the cooling liquid output by the outlet of the oil pump 20 can be transported to the transmission mechanism 104 of the generator side for lubrication more quickly, to ensure the effect of the cooling liquid lubricating the transmission mechanism 104 of the generator side, thereby improving the utilization rate of the cooling liquid while further improving the overall working performance and service life of the power assembly 100.

[0187] Please refer to FIG. 13 and FIG. 14 together, FIG. 13 is a planar structural schematic diagram of the cooling liquid transported by one motor flow channel 11 and one generator flow channel 12 in the power assembly 100 provided by the embodiment of the present application, and FIG. 14 is a planar structural schematic diagram of the cooling liquid transported by one motor flow channel 11 and one generator flow channel 12 in the power assembly 100 provided by the embodiment of the present application. In order to clearly show the communication relationship between the valve 30, the motor flow channel 11 and the generator flow channel 12 in the power assembly 100, etc., in the embodiment shown in FIG. 13 and FIG. 14, part of the functional structures in the power assembly 100 such as the oil pump 20 and the heat exchanger 106 are hidden.

[0188] As shown in FIG. 13 and FIG. 14, one motor flow channel 11 includes one motor flow channel inlet 111 and one or more motor flow channel outlets 112, and one generator flow channel 12 includes one generator flow channel inlet 121 and one or more generator flow channel outlets 122. Among them, one motor flow channel inlet 111 and one generator flow channel inlet 121 are in parallel, one or more motor flow channel outlets 112 are used to output cooling liquid to at least one of the stator and rotor of the motor 103 for heat dissipation, and the other one or more motor flow channel outlets 112 are used to output cooling liquid to one gear or one bearing of the reducer 101 for lubrication.

[0189] In an example, one valve 30 is arranged on one motor flow channel 11, and along the direction of the flow of the cooling liquid in one motor flow channel 11, one valve 30 is located at the rear end of one motor flow channel inlet 111 and at the front end of the branch of one or more motor flow channel outlets 112 and the other one or more motor flow channel outlets 112. One valve 30 is used to adjust the flow distribution of the cooling liquid between one motor flow channel 11 and one generator flow channel 12. Among them, in the embodiment shown in FIG. 13 and FIG. 14, one valve 30 is schematically shown as a first valve 30a.

[0190] In an example, along the direction of the flow of the cooling liquid in one motor flow channel 11, the other valve 30 is located at the rear end of the branch of one or more motor flow channel outlets 112 and the other one or more motor flow channel outlets 112 and at the front end of the branch of the other one or more motor flow channel outlets 112. The other valve 30 is used to adjust the flow of the cooling liquid in one or more motor flow channel outlets 112 at the same time, and is used to adjust the flow distribution of the cooling liquid between one or more motor flow channel outlets 112 and the other one or more motor flow channel outlets 112. Among them, in the embodiment shown in FIG. 13 and FIG. 14, the other valve 30 is schematically shown as a second valve 30b.

[0191] It can be understood that the relative flow size of the cooling liquid delivered to the motor side and the generator side of the power assembly can be adjusted by the first valve 30a, and the relative size of the flow of the cooling liquid used for lubrication and the flow of the cooling liquid used for heat dissipation of the motor side of the power assembly can be adjusted by the second valve 30b, which can further improve the accuracy and efficiency of the distribution of the cooling liquid, and further improve the utilization rate of the cooling liquid and reduce the power consumption of the power assembly 100 and the loss of the cooling liquid.

[0192] In one embodiment, the housing 105 of the power assembly 100 is configured to integrate two stator accommodating slots (not shown), two internal flow channels 10 and a plurality of bearing cavities (not shown). One of the stator accommodating slots is configured to accommodate a stator of the motor 103, and the other of the stator accommodating slots is configured to accommodate a stator of the generator 102. One of the bearing cavities is configured to accommodate a bearing of the motor 103, and the other of the bearing cavities is configured to accommodate a bearing of the generator 102.

[0193] Specifically, the slot wall of each of the stator accommodating slots includes a slot wall flow channel and a liquid outlet hole in communication with each other, and the inner peripheral wall of each of the bearing cavities includes a liquid outlet port.

[0194] The liquid outlet hole of one of the stator accommodating slots serves as a motor flow channel outlet 112, and the liquid outlet hole of the other of the stator accommodating slots serves as a generator flow channel outlet 122. The liquid outlet port of one of the bearing cavities is configured to communicate with one of the internal flow channels 10, and the liquid outlet port of the other of the bearing cavities is configured to communicate with the other of the internal flow channels 10.

[0195] One end of each of the internal flow channels 10 is configured to communicate with the liquid outlet hole through the slot wall flow channel, and the other end of one of the internal flow channels 10 serves as a motor flow channel inlet 111, and the other end of the other of the internal flow channels 10 serves as a generator flow channel inlet 121. One of the internal flow channels 10 is configured to accommodate a valve 30.

[0196] It can be understood that the maximum outer diameter of the motor can generally refer to the outer diameter of the internal stator, and thus each of the stator accommodating slots is capable of accommodating a stator, a rotor coaxially arranged inside the stator, a motor shaft, and other possible functional structural components of the motor, i.e., each of the stator accommodating slots is configured to accommodate and fix a motor. The housing 105 of the power assembly 100 integrates two stator accommodating slots, which are configured to accommodate a motor 103 and a generator 102, respectively.

[0197] In addition, each of the stator accommodating slots is provided with a liquid outlet hole, and each of the liquid outlet holes is in communication with one end of one of the internal flow channels 10, so that one end of one of the internal flow channels 10 is capable of delivering cooling liquid to the stator or the rotor in each of the stator accommodating slots through the liquid outlet hole for heat dissipation. In addition, one of the internal flow channels 10 is in communication with a liquid outlet port, so as to deliver cooling liquid to each of the bearing cavities through the liquid outlet port for lubricating the bearing accommodated in each of the bearing cavities, thereby improving the working performance and service life of each of the bearings.

[0198] The two stator accommodating grooves, the two internal flow channels 10 and the plurality of bearing cavities are simultaneously integrated in the housing 105 of the power assembly 100, so that the housing 105 can simultaneously realize the functions of accommodating and fixing one or more motors, the functions of delivering cooling liquid, and the functions of accommodating and fixing bearings, so as to simplify the internal structure design of the power assembly 100 and improve the overall preparation efficiency of the power assembly 100.

[0199] 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 noted 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 within the scope of protection of the present application.

Claims

1. A powertrain having parallel flow paths, characterized by, The power assembly comprises a generator, an electric motor and an oil pump, the power assembly comprises an electric motor flow channel and a generator flow channel, wherein: The electric motor flow channel comprises at least one electric motor flow channel inlet, at least one electric motor flow channel outlet, and a valve, one or more of the at least one electric motor flow channel outlet is used to output cooling liquid to dissipate heat from at least one of the rotor or stator of the electric motor, and the valve is used to connect one or more of the electric motor flow channel inlets and the one or more electric motor flow channel outlets; The generator flow channel comprises at least one generator flow channel inlet and at least one generator flow channel outlet, one or more of the at least one generator flow channel outlet is used to output cooling liquid to dissipate heat from at least one of the rotor or stator of the generator; The outlet of the oil pump is used to connect the at least one electric motor flow channel inlet and the at least one generator flow channel inlet, and the valve is used to simultaneously adjust the flow of the one or more electric motor flow channel outlets and the one or more generator flow channel outlets.

2. The powertrain of claim 1, wherein, Each of the electric motor flow channel inlets is used to transmit cooling liquid to one or more of the electric motor flow channel outlets, and each of the generator flow channel inlets is used to transmit cooling liquid to one or more of the generator flow channel outlets, wherein: The distance from the outlet of the oil pump to each of the generator flow channel inlets is greater than the distance from the outlet of the oil pump to each of the electric motor flow channel inlets along the direction of the flow of the cooling liquid output by the oil pump.

3. The powertrain of any one of claims 1 or 2, wherein, The aperture of each of the electric motor flow channel inlets is greater than the aperture of each of the generator flow channel inlets.

4. The powertrain of any one of claims 1-3, wherein, Another one or more of the at least one electric motor flow channel outlet is used to output cooling liquid to lubricate at least one of the bearings or the speed reducer of the electric motor, wherein: One of the electric motor flow channel inlets is used to connect one or more of the electric motor flow channel outlets, and another of the electric motor flow channel inlets is used to connect another one or more of the electric motor flow channel outlets; The distance from the outlet of the oil pump to the one of the electric motor flow channel inlets is greater than the distance from the outlet of the oil pump to the another of the electric motor flow channel inlets along the direction of the flow of the cooling liquid output by the oil pump.

5. The powertrain of claim 4, wherein, The aperture of the one or more electric motor flow channel outlets is greater than the aperture of the another one or more of the electric motor flow channel outlets.

6. The powertrain of any one of claims 1-5, wherein, Another one or more of the at least one generator flow channel outlet is used to output cooling liquid to lubricate the bearings of the generator, wherein: One of the generator flow channel inlets is used to connect the one or more generator flow channel outlets, and another of the generator flow channel inlets is used to connect the another one or more generator flow channel outlets; The aperture of the one or more generator flow channel outlets is greater than the aperture of the another one or more generator flow channel outlets.

7. The powertrain of claim 5, wherein, The flow distance of the cooling liquid flowing from the outlet of the one oil pump to the inlet of the one motor flow channel is greater than the flow distance of the cooling liquid flowing from the outlet of the one oil pump to the inlet of the one generator flow channel.

8. The powertrain of any one of claims 1-7, wherein, The one valve adjusts the opening degree of the one valve while the rotational speed of the one oil pump remains unchanged, wherein: The opening degree of the one valve increases, and the flow rate of the one or more motor flow channel outlets increases and the flow rate of the one or more generator flow channel outlets decreases; The opening degree of the one valve decreases, and the flow rate of the one or more motor flow channel outlets decreases and the flow rate of the one or more generator flow channel outlets increases.

9. The powertrain of any of claims 1-8, wherein, The flow rate of each of the motor flow channel outlets changes differently with the adjustment of the opening degree of the one valve while the rotational speed of the one oil pump remains unchanged.

10. The powertrain of any one of claims 1-9, wherein, The one valve is used to adjust the opening degree of the one valve according to the working condition of at least one of the one motor or the one generator, wherein: When at least one of the rotational speed or the torque of the one motor increases from a first preset value to a second preset value, the opening degree of the one valve is adjusted from a first opening degree to a second opening degree, and the first opening degree is less than the second opening degree; When at least one of the rotational speed or the torque of the one generator decreases from a third preset value to a fourth preset value, the opening degree of the one valve is adjusted from a third opening degree to a fourth opening degree, and the third opening degree is greater than the fourth opening degree.

11. The powertrain of claim 10, wherein, When at least one of the rotational speed or the torque of the one motor is less than or equal to a fifth preset value, the opening degree of the one valve remains a fifth opening degree, the fifth preset value is less than the first preset value, and the fifth opening degree is less than the first opening degree; When the temperature of the one motor is greater than a preset temperature value, the opening degree of the one valve remains a sixth opening degree, and the sixth opening degree is less than or equal to the second opening degree.

12. The powertrain of any one of claims 1-11, wherein, The power assembly further comprises one heat exchanger and at least one filter, wherein: Before flowing into the one or more motor flow channel inlets and the one or more generator flow channel inlets, the cooling liquid further flows through the one heat exchanger and one of the filters.

13. The powertrain of claim 12, wherein, The at least one filter comprises two filters, the pore size of the filter screen in one of the filters is less than the pore size of the filter screen in the other filter, wherein: The cooling liquid flowing into each of the motor flow channel inlets and each of the generator flow channel inlets flows through the one filter, and the cooling liquid flowing out of each of the motor flow channel outlets and each of the generator flow channel outlets flows into the inlet of the one oil pump after flowing through the other filter.

14. The powertrain of any one of claims 1-13, wherein, The housing of the power assembly is used to integrate two stator accommodating grooves, two internal flow channels and a plurality of bearing cavities, wherein: Each of the slot walls of the stator accommodating slots comprises a slot wall flow channel and a liquid outlet hole in communication, one of the stator accommodating slots is used for fixing the stator of the one motor, the other of the stator accommodating slots is used for fixing the stator of the one generator, one of the liquid outlet holes of the one stator accommodating slots is used as the flow channel outlet of the one motor, one of the liquid outlet holes of the other stator accommodating slots is used as the flow channel outlet of the one generator; One end of each of the internal flow channels is used for communicating one of the liquid outlet holes through one of the slot wall flow channels, the other end of one of the internal flow channels is used as the flow channel inlet of the one motor, the other end of the other of the internal flow channels is used as the flow channel inlet of the one generator, the one internal flow channel is used for accommodating the one valve; The inner peripheral wall of each of the bearing cavities comprises a liquid outlet hole, one of the bearing cavities is used for fixing the bearing of the one motor, the other of the bearing cavities is used for fixing the bearing of the one generator, one of the liquid outlet holes of the one bearing cavity is used for communicating the one internal flow channel, one of the liquid outlet holes of the other bearing cavity is used for communicating the other internal flow channel.

15. An electric vehicle characterized by comprising: The electric vehicle comprises wheels and a power assembly as claimed in any one of claims 1-14, the power assembly is used for driving the wheels.

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