Motor thermal management method, device and system and vehicle

Abstract

The invention discloses a motor thermal management method, device and system and a vehicle. The method comprises the steps that the working state of a driving motor is obtained; when it is monitored that the driving motor is converted from the running state to the shutdown state, a first pressure control valve, a second pressure control valve and a third pressure control valve are controlled to be closed; after a first time period after the first pressure control valve, the second pressure control valve and the third pressure control valve are controlled to be closed, the third pressure control valve is controlled to be opened; after a second time period after the third pressure control valve is controlled to be opened, the first pressure control valve is controlled to be opened; and after a third time period after the third pressure control valve is controlled to be opened, the first pressure control valve and the third pressure control valve are controlled to be closed. By controlling the state of the pressure control valve, the liquefied refrigerant in the system is used for cooling the driving motor, non-energy-consumption heat dissipation can be achieved, the comprehensive efficiency of the system can be improved, and the endurance mileage of the whole vehicle can be increased.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle technology, and in particular to a motor thermal management method, device, system and vehicle. Background Art

[0002] Driven by the trend toward electrification of vehicles, the energy density of power batteries is low, making range a key metric for electric vehicles. As the drive motor converts electrical energy into mechanical energy, there's a significant temperature difference between the motor's interior and the vehicle's surroundings, accumulating energy. Traditional methods use a water pump to dissipate heat through a fan. This underutilizes this entrapped energy, while the pump and fan also consume some energy, reducing battery efficiency. Summary of the Invention

[0003] The present invention provides a motor thermal management method, device, system and vehicle, which can achieve non-energy-consuming heat dissipation, help improve the overall efficiency of the system, and help increase the cruising range of the entire vehicle.

[0004] In a first aspect, an embodiment of the present invention provides a motor thermal management method applicable to a motor thermal management system, the motor thermal management system comprising: a refrigerant pipeline and a condenser, a liquid storage drying tank, a drive motor, and a pressure control valve sequentially connected via the refrigerant pipeline; the pressure control valve comprising a first pressure control valve located between the drive motor and the condenser, a second pressure control valve located between the condenser and the liquid storage drying tank, and a third pressure control valve located between the liquid storage drying tank and the drive motor;

[0005] The motor thermal management method comprises:

[0006] Acquiring the working status of the driving motor;

[0007] When it is detected that the drive motor changes from a running state to a stopped state, the first pressure control valve, the second pressure control valve and the third pressure control valve are controlled to close;

[0008] After a first period of time has passed since the first, second, and third pressure control valves were closed, the third pressure control valve was controlled to open;

[0009] After a second period of time after the third pressure control valve is controlled to be open, controlling the first pressure control valve to be open;

[0010] After a third period of time after the third pressure control valve is controlled to be open, controlling the first pressure control valve and the third pressure control valve to be closed;

[0011] Among them, during the first time period, the refrigerant in the drive motor, the liquid storage drying tank and the condenser changes from a vaporized state to a liquefied state, and the refrigerant pipeline forms a vacuum environment; during the second time period, the liquefied refrigerant continues to flow into the drive motor; the third time period is greater than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

[0012] Optionally, the motor thermal management system further includes temperature and pressure sensors, which include a first temperature and pressure sensor, a second temperature and pressure sensor, and a third temperature and pressure sensor; the first temperature and pressure sensor is located between the condenser and the second pressure control valve, the second temperature and pressure sensor is located between the liquid storage drying tank and the third pressure control valve, and the third temperature and pressure sensor is located between the drive motor and the first pressure control valve;

[0013] After obtaining the working state of the driving motor, the method further includes:

[0014] When monitoring that the drive motor changes from a stopped state to a running state, obtaining the pressure detected by the third temperature and pressure sensor;

[0015] When the pressure detected by the third temperature and pressure sensor is greater than a first pressure threshold, controlling the first pressure control valve and the second pressure control valve to open;

[0016] After a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be open, controlling the first pressure control valve and the second pressure control valve to be closed;

[0017] After a fifth period of time after controlling the first pressure control valve and the second pressure control valve to be closed, controlling the second pressure control valve and the third pressure control valve to be open;

[0018] After a sixth period of time after the second pressure control valve and the third pressure control valve are controlled to be open, the second pressure control valve and the third pressure control valve are controlled to be closed;

[0019] Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser, and after the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach a first preset temperature, and the detected pressures all reach a second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to a third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

[0020] Optionally, after a sixth time period after controlling the second pressure control valve to open, and after controlling the first pressure control valve and the third pressure control valve to close, the method further includes:

[0021] Acquiring the pressure detected by the third temperature and pressure sensor;

[0022] When the pressure detected by the third temperature and pressure sensor is greater than a first pressure threshold, controlling the first pressure control valve and the second pressure control valve to open;

[0023] After a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be open, controlling the first pressure control valve and the second pressure control valve to be closed;

[0024] After a fifth period of time after controlling the first pressure control valve and the second pressure control valve to be closed, controlling the second pressure control valve and the third pressure control valve to be open;

[0025] After a sixth period of time after the second pressure control valve and the third pressure control valve are controlled to be open, the second pressure control valve and the third pressure control valve are controlled to be closed;

[0026] In a second aspect, an embodiment of the present invention further provides a motor thermal management device, comprising:

[0027] A working status acquisition module is used to obtain the working status of the drive motor;

[0028] a pressure control valve control module, configured to control the first pressure control valve, the second pressure control valve, and the third pressure control valve to close when the working state acquisition module detects that the drive motor changes from a running state to a stopped state;

[0029] The pressure control valve control module is further configured to control the third pressure control valve to open after a first period of time has passed since the first pressure control valve, the second pressure control valve, and the third pressure control valve were closed;

[0030] The pressure control valve control module is further configured to control the first pressure control valve to open after a second time period after the third pressure control valve is controlled to open; the pressure control valve control module is further configured to control the first pressure control valve and the third pressure control valve to close after a third time period after the third pressure control valve is controlled to open;

[0031] Among them, during the first time period, the refrigerant in the drive motor, liquid storage drying tank and condenser changes from a vaporized state to a liquefied state, and the refrigerant pipeline forms a vacuum environment; during the second time period, the liquefied refrigerant continuously flows into the drive motor; the third time period is greater than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

[0032] Optionally, a temperature and pressure acquisition module is also included;

[0033] The temperature and pressure acquisition module is used to acquire the pressure detected by the third temperature and pressure sensor;

[0034] The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor acquired by the temperature and pressure acquisition module is greater than a first pressure threshold;

[0035] The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to close after a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be opened; the pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to open after a fifth time period after the first pressure control valve and the second pressure control valve are controlled to be closed; the pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to close after a sixth time period after the second pressure control valve and the third pressure control valve are controlled to be opened;

[0036] Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser, and after the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach a first preset temperature, and the detected pressures all reach a second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to the third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

[0037] Optionally, the pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor is greater than the first pressure threshold;

[0038] The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to close after a fourth time period after the first pressure control valve and the second pressure control valve are controlled to open;

[0039] The pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to open after a fifth time period after the first pressure control valve and the second pressure control valve are controlled to be closed;

[0040] The pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to close after a sixth time period after the second pressure control valve is controlled to open.

[0041] In a third aspect, an embodiment of the present invention further provides a motor thermal management system, comprising: a refrigerant pipeline and a condenser, a liquid storage drying tank, a drive motor and a pressure control valve connected in sequence through the refrigerant pipeline; the pressure control valve comprises a first pressure control valve located between the drive motor and the condenser, a second pressure control valve located between the condenser and the liquid storage drying tank, and a third pressure control valve located between the liquid storage drying tank and the drive motor.

[0042] Optionally, it also includes: a temperature and pressure sensor, which includes a first temperature and pressure sensor, a second temperature and pressure sensor, and a third temperature and pressure sensor; the first temperature and pressure sensor is located between the condenser and the second pressure control valve, the second temperature and pressure sensor is located between the liquid storage drying tank and the third pressure control valve, and the third temperature and pressure sensor is located between the drive motor and the first pressure control valve.

[0043] Optionally, the refrigerant pipeline includes a drive motor corresponding area, and the drive motor corresponding area surrounds the stator of the drive motor;

[0044] The drive motor corresponding area includes a first circulation area and a second circulation area arranged opposite to each other along a first direction, the first circulation area and the second circulation area being located on upper and lower sides of the stator along the first direction, respectively, and a pipe width of the first circulation area is smaller than a pipe width of the second circulation area along the first direction; wherein the first direction is the direction of gravity of the drive motor corresponding area;

[0045] The drive motor corresponding area includes an evaporation area, a transmission area and a condensation area arranged in sequence;

[0046] The evaporation region is close to the third pressure control valve, and the condensation region is close to the first pressure control valve.

[0047] In a fourth aspect, an embodiment of the present invention further provides a vehicle, comprising: a power battery and the motor thermal management system described in the third aspect.

[0048] An embodiment of the present invention provides a motor thermal management method, device, system, and vehicle, the method comprising: obtaining the working state of the drive motor; when monitoring that the drive motor changes from the running state to the shutdown state, controlling the first pressure control valve, the second pressure control valve, and the third pressure control valve to close; after a first time period after the first pressure control valve, the second pressure control valve, and the third pressure control valve are closed, controlling the third pressure control valve to open; after a second time period after the third pressure control valve is opened, controlling the first pressure control valve to open; after a third time period after the third pressure control valve is opened, controlling the first pressure control valve to close. The present invention controls the state of the pressure control valves and utilizes the liquefied refrigerant in the system to cool the drive motor, thereby achieving non-energy-consuming heat dissipation, which is beneficial to improving the overall efficiency of the system and improving the cruising range of the entire vehicle.

[0049] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 Schematic diagram of the structure of a motor thermal management system provided by an embodiment of the present invention;

[0052] Figure 2 is a flow chart of a motor thermal management method provided by an embodiment of the present invention;

[0053] Figure 3 is a flow chart of another motor thermal management method provided by an embodiment of the present invention;

[0054] Figure 4 1 is a schematic structural diagram of a motor thermal management device provided by an embodiment of the present invention;

[0055] Figure 51 is a schematic structural diagram of another motor thermal management device provided by an embodiment of the present invention;

[0056] Figure 6 is a cross-sectional schematic diagram of a corresponding area of ​​a drive motor provided by an embodiment of the present invention;

[0057] Figure 7 This is a flow chart of the phase change of the refrigerant in the corresponding area of ​​the drive motor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0059] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] Figure 1 This is a schematic diagram of the structure of a motor thermal management system provided by an embodiment of the present invention. Figure 2 is a flow chart of a motor thermal management method provided by an embodiment of the present invention. Figure 2 The motor thermal management method in Figure 1 The motor thermal management system in Figure 1 The motor thermal management system includes: a refrigerant pipeline 110 and a condenser 120, a liquid storage and drying tank 130, a drive motor 140 and a pressure control valve 150 connected in sequence through the refrigerant pipeline 110; the pressure control valve 150 includes a first pressure control valve 151 located between the drive motor 140 and the condenser 120, a second pressure control valve 152 located between the condenser 120 and the liquid storage and drying tank 130, and a third pressure control valve 153 located between the liquid storage and drying tank 130 and the drive motor 140.

[0061] Among them, the condenser 120 is a type of heat exchanger that can convert gas refrigerant into liquid refrigerant. The liquid storage and drying tank 130 is used to store, dry and filter refrigerant. The liquid storage and drying tank 130 is a component that has been continuously improved and updated in the development of air conditioning and has the function of storing, drying and filtering refrigerant. The existence of the liquid storage and drying tank 130 can ensure the normal operation and high efficiency of the thermal management system. The drive motor 140 provides driving force for the entire vehicle and generates a large amount of heat when working. In this embodiment, when the refrigerant flows through the drive motor 140, it can absorb the heat of the drive motor 140 and undergo a phase change, so that at least part of the liquid refrigerant is vaporized into a gaseous refrigerant, thereby cooling the drive motor 140 and improving the efficiency of the drive motor 140. The refrigerant at the drive motor 140 absorbs heat, and its internal energy increases, and its enthalpy value increases after vaporization. At the same time, the pressure and temperature rise, further increasing the enthalpy value of the refrigerant. The outflowing liquid refrigerant enters the condenser 120, which transfers the heat of the refrigerant to the external environment. The refrigerant gradually liquefies, the enthalpy value decreases, and the cycle begins again. In an embodiment of the present invention, controlling the opening of the first pressure control valve can ensure that the pressure of the refrigerant pipeline is below 2.0 MPA and the temperature of the refrigerant pipeline does not exceed 66 degrees. The second pressure control valve can prevent the refrigerant from liquefying through insulation measures, reduce the pressure of the refrigerant pipeline, and affect the expansion energy. The third pressure control valve can prevent the refrigerant from liquefying through insulation measures, reduce the pressure of the refrigerant pipeline, and affect the expansion energy.

[0062] refer to Figure 2 , the motor thermal management method includes:

[0063] S210: Acquire the working status of the drive motor.

[0064] Specifically, the working state of the drive motor includes a running state and a stopped state.

[0065] S220: When it is detected that the driving motor changes from the running state to the stopping state, the first pressure control valve, the second pressure control valve, and the third pressure control valve are controlled to close.

[0066] It can be understood that when the drive motor is not working, the first pressure control valve, the second pressure control valve and the third pressure control valve are controlled to be closed, and the refrigerant vaporized in the drive motor, the liquid storage drying tank and the condenser will cool naturally, thereby changing from a vaporized state to a liquefied state.

[0067] S230 : After a first period of time after the first pressure control valve, the second pressure control valve, and the third pressure control valve are closed, control the third pressure control valve to open.

[0068] It can be understood that after the first time period after the first pressure control valve, the second pressure control valve and the third pressure control valve are closed, a vacuum environment will be formed in the refrigerant pipeline due to the liquefaction of the refrigerant. At this time, the third pressure control valve is controlled to open, so that the cooled and liquefied refrigerant can flow into the drive motor, thereby cooling the drive motor.

[0069] S240 : After a second period of time after the third pressure control valve is controlled to be open, the first pressure control valve is controlled to be open.

[0070] It can be understood that after the second time period after controlling the third pressure control valve to open, a portion of the liquefied refrigerant enters the drive motor, and controlling the first pressure control valve to open allows the refrigerant flowing through the drive motor to enter the condenser again.

[0071] S250 : After a third period of time after the third pressure control valve is controlled to be open, the first pressure control valve and the third pressure control valve are controlled to be closed.

[0072] It can be understood that controlling the third pressure control valve to open for the third time period can allow the liquefied refrigerant to fully enter the drive motor, thereby cooling the drive motor to the maximum extent.

[0073] It should be noted that the first, second, and third time periods are calibrated based on actual conditions. During the first time period, the refrigerant in the drive motor, liquid storage tank, and condenser transitions from a vaporized state to a liquefied state, creating a vacuum in the refrigerant pipelines. During the second time period, the liquefied refrigerant continues to flow into the drive motor. The third time period is longer than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

[0074] The present invention controls the state of the pressure control valve and utilizes the liquefied refrigerant in the system to cool the drive motor, thereby achieving non-energy heat dissipation, which is beneficial to improving the overall efficiency of the system and increasing the cruising range of the entire vehicle.

[0075] Optionally, based on the above embodiment, continue to refer to Figure 1 The motor thermal management system also includes a temperature and pressure sensor 160, which includes a first temperature and pressure sensor 161, a second temperature and pressure sensor 162, and a third temperature and pressure sensor 163; the first temperature and pressure sensor 161 is located between the condenser 120 and the second pressure control valve 152, the second temperature and pressure sensor 162 is located between the liquid storage drying tank 130 and the third pressure control valve 153, and the third temperature and pressure sensor 163 is located between the drive motor 140 and the first pressure control valve 151.

[0076] Among them, the temperature and pressure sensor 160 can detect the pressure and temperature of the refrigerant in the motor thermal management system. By monitoring the pressure and temperature of the refrigerant in the motor thermal management system and controlling the pressure control valve 150 under set conditions, the drive motor can be cooled to ensure the normal operation of the drive motor.

[0077] Figure 3 This is a flow chart of another motor thermal management method provided by an embodiment of the present invention, refer to Figure 3 , the method comprises the following steps:

[0078] S310: Acquire the working status of the drive motor.

[0079] S320: When it is detected that the driving motor changes from the shutdown state to the running state, the pressure detected by the third temperature and pressure sensor is obtained.

[0080] It can be understood that when it is monitored that the drive motor changes from a shutdown state to a running state, since heat is generated when the drive motor starts working, and since the first pressure control valve and the third pressure control valve are closed, the refrigerant between the first pressure control valve and the third pressure control valve will gradually vaporize, and at the same time cause the pressure to gradually increase. By obtaining the pressure detected by the third temperature and pressure sensor, the pressure detected by the third temperature and pressure sensor can be determined, thereby determining the state of the refrigerant between the first pressure control valve and the third pressure control valve.

[0081] S330 : When the pressure detected by the third temperature and pressure sensor is greater than the first pressure threshold, control the first pressure control valve and the second pressure control valve to open.

[0082] The first pressure threshold is the pressure value of the refrigerant pipeline between the first pressure control valve and the third pressure control valve when the refrigerant between the first pressure control valve and the third pressure control valve is in a vaporized state. For example, the first pressure threshold may be 2.0 MPa.

[0083] It can be understood that when the pressure detected by the third temperature and pressure sensor is greater than the first pressure threshold, it means that the refrigerant between the first pressure control valve and the third pressure control valve is in a vaporized state. At this time, the first pressure control valve and the second pressure control valve are controlled to open, so that the vaporized refrigerant can flow through the condenser and the liquid storage drying tank.

[0084] S340 , after a fourth period of time after the first pressure control valve and the second pressure control valve are controlled to be open, control the first pressure control valve and the second pressure control valve to be closed.

[0085] It can be understood that after the fourth time period after the first pressure control valve and the second pressure control valve are controlled to open, the refrigerant vaporized by the driven motor flows through the condenser and is cooled, and the pressure balance in the refrigerant pipeline will gradually be reached, that is, the temperature and pressure of each part of the refrigerant pipeline will reach the preset value. At this time, the first pressure control valve and the second pressure control valve are controlled to close, so that the refrigerant in the condenser and the liquid storage drying tank can be cooled and liquefied.

[0086] S350 , after a fifth period of time after the first pressure control valve and the second pressure control valve are controlled to be closed, the second pressure control valve and the third pressure control valve are controlled to be open.

[0087] It can be understood that after the fifth time period after the first pressure control valve and the second pressure control valve are closed, the liquefaction of the refrigerant will generate low pressure. At this time, the second pressure control valve and the third pressure control valve are controlled to open, so that the liquefied refrigerant in the condenser and the liquid storage drying tank can flow into the drive motor to cool the drive motor.

[0088] S360: After a sixth period of time after the second pressure control valve and the third pressure control valve are controlled to be open, the second pressure control valve and the third pressure control valve are controlled to be closed.

[0089] Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser. After the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach the first preset temperature, and the detected pressures all reach the second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to the third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

[0090] Optionally, based on the above embodiment, continue to refer to Figure 3 , after step S360, further comprising:

[0091] S370: Obtain the pressure detected by the third temperature and pressure sensor.

[0092] After step S370 , steps S330 to S360 are executed again.

[0093] It is understandable that in the embodiment of the present invention, when the drive motor is in operation, the liquefied refrigerant is continuously used to cool the drive motor, thereby achieving non-energy-consuming heat dissipation.

[0094] In summary, the present invention can achieve non-energy heat dissipation by controlling the state of the pressure control valve and utilizing the liquefied refrigerant in the system to cool the drive motor when the drive motor changes from the running state to the shutdown state, from the shutdown state to the running state, and is in the working state, which is beneficial to improving the overall efficiency of the system and improving the cruising range of the entire vehicle.

[0095] Figure 4 This is a schematic diagram of the structure of a motor thermal management device provided by an embodiment of the present invention, with reference to Figure 4 The device includes: a working status acquisition module 410 and a pressure control valve control module 420.

[0096] In an embodiment of the present invention, the working status acquisition module 410 is used to acquire the working status of the drive motor; the pressure control valve control module 420 is used to control the first pressure control valve, the second pressure control valve and the third pressure control valve to close when the working status acquisition module monitors that the drive motor changes from the running state to the shutdown state; the pressure control valve control module 420 is also used to control the third pressure control valve to open after a first time period after controlling the first pressure control valve, the second pressure control valve and the third pressure control valve to close; the pressure control valve control module 420 is also used to control the first pressure control valve to open after a second time period after controlling the third pressure control valve to open; the pressure control valve control module 420 is also used to control the first pressure control valve and the third pressure control valve to close after a third time period after controlling the third pressure control valve to open.

[0097] Among them, in the first time period, the refrigerant in the drive motor, liquid storage drying tank and condenser changes from a vaporized state to a liquefied state, and the refrigerant pipeline forms a vacuum environment; in the second time period, the liquefied refrigerant continuously flows into the drive motor; the third time period is longer than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

[0098] Figure 5 This is a schematic diagram of the structure of another motor thermal management device provided by an embodiment of the present invention. Optionally, based on the above embodiment, continue to refer to Figure 5 , the device also includes a temperature and pressure acquisition module 510.

[0099] In an embodiment of the present invention, the temperature and pressure acquisition module 510 is used to acquire the pressure detected by the third temperature and pressure sensor; the pressure control valve control module 420 is also used to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor acquired by the temperature and pressure acquisition module 510 is greater than the first pressure threshold; the pressure control valve control module 420 is also used to control the first pressure control valve and the second pressure control valve to close after a fourth time period after controlling the first pressure control valve and the second pressure control valve to open; the pressure control valve control module 420 is also used to control the second pressure control valve and the third pressure control valve to open after a fifth time period after controlling the first pressure control valve to close; the pressure control valve control module 420 is also used to control the second pressure control valve and the third pressure control valve to close after a sixth time period after controlling the second pressure control valve and the third pressure control valve to open.

[0100] Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser. After the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach the first preset temperature, and the detected pressures all reach the second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to the third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

[0101] Optionally, based on the above embodiment, the pressure control valve control module 420 is also used to control the first pressure control valve and the third pressure control valve to open when the pressure detected by the third temperature and pressure sensor is greater than the first pressure threshold; the pressure control valve control module 420 is also used to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor obtained by the temperature and pressure acquisition module 510 is greater than the first pressure threshold; the pressure control valve control module 420 is also used to control the first pressure control valve and the second pressure control valve to close after a fourth time period after controlling the first pressure control valve and the second pressure control valve to open; the pressure control valve control module 420 is also used to control the second pressure control valve and the third pressure control valve to open after a fifth time period after controlling the first pressure control valve to close; the pressure control valve control module 420 is also used to control the second pressure control valve and the third pressure control valve to close after a sixth time period after controlling the second pressure control valve and the third pressure control valve to open.

[0102] The motor thermal management device provided in an embodiment of the present invention is used to implement the motor thermal management method provided in any of the above embodiments, and has corresponding functional modules and beneficial effects. For contents not described in detail in the embodiments of the present invention, reference can be made to the motor thermal management method provided in the above embodiments.

[0103] Optionally, based on the above embodiment, the refrigerant pipeline 110 includes a drive motor corresponding area, and the drive motor corresponding area surrounds the stator of the drive motor 140 (not shown in the drawings). Figure 6 is a cross-sectional schematic diagram of a corresponding area of ​​a drive motor provided by an embodiment of the present invention, with reference to Figure 6 The driving motor corresponding area 111 includes a first circulation area 1111 and a second circulation area 1112 which are arranged opposite to each other along the first direction x. The first circulation area 1111 and the second circulation area 1112 are respectively located on the upper and lower sides of the stator along the first direction x. Along the first direction x, the pipe width of the first circulation area 1111 is smaller than the pipe width of the second circulation area 1112; wherein the first direction x is the gravity direction of the driving motor corresponding area 111.

[0104] It can be understood that the drive motor corresponding area 111 is the refrigerant pipeline 110 at the drive motor 140. The drive motor corresponding area 111 can be mounted on the stator of the drive motor 140. The refrigerant flows in the internal space of the drive motor corresponding area 111, so that the refrigerant surrounds the stator of the drive motor 140 to cool the stator. It can be understood that after the motor thermal management system is installed in the vehicle, the relative positions of the various components are fixed. In this embodiment, the first direction x can be defined as the gravity direction of the drive motor corresponding area 111, that is, the first direction x is the direction of the drive motor corresponding area 111 toward the ground after the system is installed. Figure 6 The direction from top to bottom shown in . The first circulation area 1111 is part of the refrigerant pipeline 110 surrounding the upper side of the stator (based on the first direction x), and the second circulation area 1112 is part of the refrigerant pipeline 110 surrounding the lower side of the stator, or it can be understood that the first circulation area 1111 is the refrigerant pipeline 110 surrounding the upper half of the stator, and the second circulation area 1112 is the refrigerant pipeline 110 surrounding the lower half of the stator, and the first circulation area 1111 and the second circulation area 1112 are interconnected. In this embodiment, it is proposed that the pipeline width along the first circulation area 1111 can be set to be smaller than the pipeline width of the second circulation area 1112, and the pipeline width is the distance between the outer wall and the corresponding inner wall of the corresponding area 111 of the drive motor, that is, Figure 6 The pipe width is shown in the cross-sectional view. It is understood that the wider the pipe, the larger the refrigerant flow area. By setting the refrigerant pipe surrounding the stator to a larger width, the unvaporized refrigerant is more likely to flow downward under the action of gravity, thereby absorbing heat and vaporizing again, improving the refrigerant vaporization efficiency. At the same time, the vaporized refrigerant is more likely to flow through the liquid outlet to the refrigerant pipeline 110 at the rear end.

[0105] Figure 7 This is a flow chart of the phase change of the refrigerant in the corresponding area of ​​the drive motor provided by an embodiment of the present invention. Figure 7 The driving motor corresponding area 111 includes an evaporation area, a transmission area and a condensation area arranged in sequence; in the embodiment of the present invention, the evaporation area is close to the third pressure control valve 153, and the condensation area is close to the first pressure control valve 151.

[0106] Specifically, a heat pipe can be provided in the refrigerant pipeline 110 at the drive motor 140, and the heat pipe is close to the side of the stator. The working principle of the heat pipe is based on the vaporization and condensation process of the liquid. When one end of the heat pipe (evaporation zone) is heated, the liquid working medium in the heat pipe absorbs heat and evaporates into a gaseous state; the gaseous medium then flows to the other end of the heat pipe (condensation zone), where it releases latent heat through condensation, and re-condenses into a liquid and returns to the evaporation zone, thereby forming a heat conduction cycle. By adding a heat pipe, it is beneficial to reduce the operating temperature of the stator coil, reduce the resistance of the coil when working, further improve the cooling effect of the drive motor 140, and thus improve the working efficiency of the drive motor 140. For example, the heat pipe can be arranged around the stator in the drive motor area, or the heat pipe can extend in parallel with the corresponding area 111 of the drive motor, or the heat pipe can be connected to the refrigerant pipeline 110 at both ends of the corresponding area 111 of the drive motor, etc., but is not limited to this. The heat pipe can extend in parallel with the refrigerant pipeline. It's important to note that when the liquid working medium comes into contact with a heat source, the heat causes it to evaporate. The evaporation zone absorbs a significant amount of heat and converts it into latent heat. The vaporized gaseous medium is transported to the condensation zone via the capillary structure within the heat pipe or gravity. In the condensation zone, the gaseous medium condenses upon cooling, releasing latent heat, which it then transfers to the surrounding refrigerant, causing it to absorb heat and vaporize. The condensed liquid working medium then returns to the evaporation zone via the capillary structure or gravity, completing the cycle.

[0107] An embodiment of the present invention further provides a vehicle, which includes a power battery and the motor thermal management system provided by the above embodiment.

[0108] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A motor thermal management method, characterized in that: Applicable to a motor thermal management system, the motor thermal management system comprising: a refrigerant pipeline and a condenser, a liquid storage drying tank, a drive motor, and a pressure control valve sequentially connected via the refrigerant pipeline; the pressure control valve comprising a first pressure control valve located between the drive motor and the condenser, a second pressure control valve located between the condenser and the liquid storage drying tank, and a third pressure control valve located between the liquid storage drying tank and the drive motor; The motor thermal management method comprises: Acquiring the working status of the driving motor; When it is detected that the drive motor changes from a running state to a stopped state, the first pressure control valve, the second pressure control valve and the third pressure control valve are controlled to close; After a first period of time has passed since the first, second, and third pressure control valves were closed, the third pressure control valve was controlled to open; After a second period of time after the third pressure control valve is controlled to be open, controlling the first pressure control valve to be open; After a third period of time after the third pressure control valve is controlled to be open, controlling the first pressure control valve and the third pressure control valve to be closed; Among them, during the first time period, the refrigerant in the drive motor, the liquid storage drying tank and the condenser changes from a vaporized state to a liquefied state, and the refrigerant pipeline forms a vacuum environment; during the second time period, the liquefied refrigerant continues to flow into the drive motor; the third time period is greater than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

2. The motor thermal management method according to claim 1, characterized in that: The motor thermal management system further includes temperature and pressure sensors, which include a first temperature and pressure sensor, a second temperature and pressure sensor, and a third temperature and pressure sensor; the first temperature and pressure sensor is located between the condenser and the second pressure control valve, the second temperature and pressure sensor is located between the liquid storage drying tank and the third pressure control valve, and the third temperature and pressure sensor is located between the drive motor and the first pressure control valve; After obtaining the working state of the driving motor, the method further includes: When monitoring that the drive motor changes from a stopped state to a running state, obtaining the pressure detected by the third temperature and pressure sensor; When the pressure detected by the third temperature and pressure sensor is greater than a first pressure threshold, controlling the first pressure control valve and the second pressure control valve to open; After a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be open, the first pressure control valve and the second pressure control valve are controlled to be closed; After a fifth period of time after controlling the first pressure control valve and the second pressure control valve to be closed, controlling the second pressure control valve and the third pressure control valve to be open; After a sixth period of time after the second pressure control valve and the third pressure control valve are controlled to be open, the second pressure control valve and the third pressure control valve are controlled to be closed; Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser, and after the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach a first preset temperature, and the detected pressures all reach a second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to a third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

3. The motor thermal management method according to claim 2, characterized in that: After a sixth period of time after controlling the second pressure control valve to open, and after controlling the first pressure control valve and the third pressure control valve to close, the method further includes: Acquiring the pressure detected by the third temperature and pressure sensor; When the pressure detected by the third temperature and pressure sensor is greater than a first pressure threshold, controlling the first pressure control valve and the second pressure control valve to open; After a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be open, the first pressure control valve and the second pressure control valve are controlled to be closed; After a fifth period of time after controlling the first pressure control valve and the second pressure control valve to be closed, controlling the second pressure control valve and the third pressure control valve to be open; After a sixth period of time after the second pressure control valve and the third pressure control valve are controlled to be open, the second pressure control valve and the third pressure control valve are controlled to be closed.

4. A motor thermal management device, characterized in that: include: A working status acquisition module is used to obtain the working status of the drive motor; a pressure control valve control module, configured to control the first pressure control valve, the second pressure control valve, and the third pressure control valve to close when the working state acquisition module detects that the drive motor changes from a running state to a stopped state; The pressure control valve control module is further configured to control the third pressure control valve to open after a first period of time has passed since the first pressure control valve, the second pressure control valve, and the third pressure control valve were closed; The pressure control valve control module is further configured to control the first pressure control valve to open after a second time period after the third pressure control valve is controlled to open; the pressure control valve control module is further configured to control the first pressure control valve and the third pressure control valve to close after a third time period after the third pressure control valve is controlled to open; Among them, during the first time period, the refrigerant in the drive motor, liquid storage drying tank and condenser changes from a vaporized state to a liquefied state, and the refrigerant pipeline forms a vacuum environment; during the second time period, the liquefied refrigerant continuously flows into the drive motor; the third time period is greater than the second time period, and after the third time period, the liquefied refrigerant fully enters the drive motor.

5. The motor thermal management device according to claim 4, characterized in that: It also includes a temperature and pressure acquisition module; The temperature and pressure acquisition module is used to acquire the pressure detected by the third temperature and pressure sensor; The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor acquired by the temperature and pressure acquisition module is greater than a first pressure threshold; The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to close after a fourth time period after the first pressure control valve and the second pressure control valve are controlled to be opened; the pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to open after a fifth time period after the first pressure control valve and the second pressure control valve are controlled to be closed; the pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to close after a sixth time period after the second pressure control valve and the third pressure control valve are controlled to be opened; Among them, when the drive motor changes from a shutdown state to a running state, the refrigerant passing through the drive motor gradually vaporizes, and the pressure in the refrigerant pipeline gradually increases; in the fourth time period, the vaporized refrigerant enters the condenser, and after the fourth time period, the temperatures detected by the first temperature and pressure sensor, the second temperature and pressure sensor, and the third temperature and pressure sensor all reach a first preset temperature, and the detected pressures all reach a second preset pressure; after the fifth time period, the refrigerant in the condenser and the liquid storage drying tank is liquefied, and the pressure detected by the first temperature and pressure sensor drops to the third preset pressure; in the sixth time period, the liquefied refrigerant flows into the drive motor.

6. The motor thermal management device according to claim 5, characterized in that: The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to open when the pressure detected by the third temperature and pressure sensor is greater than the first pressure threshold; The pressure control valve control module is further configured to control the first pressure control valve and the second pressure control valve to close after a fourth time period after the first pressure control valve and the second pressure control valve are controlled to open; The pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to open after a fifth time period after the first pressure control valve and the second pressure control valve are controlled to be closed; The pressure control valve control module is further configured to control the second pressure control valve and the third pressure control valve to close after a sixth time period after the second pressure control valve is controlled to open.

7. A motor thermal management system, characterized in that: include: A refrigerant pipeline and a condenser, a liquid storage drying tank, a drive motor and a pressure control valve connected in sequence through the refrigerant pipeline; the pressure control valve includes a first pressure control valve located between the drive motor and the condenser, a second pressure control valve located between the condenser and the liquid storage drying tank, and a third pressure control valve located between the liquid storage drying tank and the drive motor.

8. The motor thermal management system according to claim 7, characterized in that: Also includes: Temperature and pressure sensors, including a first temperature and pressure sensor, a second temperature and pressure sensor, and a third temperature and pressure sensor; the first temperature and pressure sensor is located between the condenser and the second pressure control valve, the second temperature and pressure sensor is located between the liquid storage drying tank and the third pressure control valve, and the third temperature and pressure sensor is located between the drive motor and the first pressure control valve.

9. The motor thermal management system according to claim 7, characterized in that: The refrigerant pipeline includes a drive motor corresponding area, and the drive motor corresponding area surrounds the stator of the drive motor; The drive motor corresponding area includes a first circulation area and a second circulation area arranged opposite to each other along a first direction, the first circulation area and the second circulation area being located on upper and lower sides of the stator along the first direction, respectively, and a pipe width of the first circulation area is smaller than a pipe width of the second circulation area along the first direction; wherein the first direction is the direction of gravity of the drive motor corresponding area; The drive motor corresponding area includes an evaporation area, a transmission area and a condensation area arranged in sequence; The evaporation region is close to the third pressure control valve, and the condensation region is close to the first pressure control valve.

10. A vehicle, characterized in that: include: A power battery and a motor thermal management system as described in any one of claims 7 to 9.

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