Vehicle thermal management system and vehicle thermal management method

Abstract

The present invention discloses a vehicle thermal management system and a vehicle thermal management method, wherein the vehicle thermal management system includes a heat pump air conditioning system, a battery temperature control system, an electric drive cooling system, and a seven-way valve; the battery temperature control system includes a power battery branch and a heating evaporation branch; the heat pump air conditioning system and the heating evaporation branch are connected; the power battery branch, the heating evaporation branch, and the electric drive cooling system are connected via the seven-way valve, and the valve operating state of the seven-way valve is switched to determine the target operating mode. The present invention can achieve switching between different operating modes by switching the valve operating state of the seven-way valve, so that excess heat can be flexibly transferred between the heat pump air conditioning system, the battery temperature control system, and the electric drive cooling system, thereby effectively using excess heat, saving energy, and reducing energy loss, thereby effectively reducing energy loss.

Description

Technical Field

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

[0002] A typical vehicle thermal management system consists of three independent systems: the electric drive cooling system, the power battery temperature control system, and the air conditioning system. In low-temperature environments, the heat pump air conditioning system's evaporator and the power battery system need to absorb heat. The electric drive system and power battery generate heat during operation. To ensure proper functioning of these components, this excess heat is often discharged to the environment through a heat exchanger, preventing effective utilization. Furthermore, existing vehicle thermal management systems are complex and costly. Summary of the Invention

[0003] Embodiments of the present invention provide a vehicle thermal management system and a vehicle thermal management method to solve the problem that waste heat cannot be effectively utilized.

[0004] A vehicle thermal management system includes a heat pump air conditioning system, a battery temperature control system, an electric drive cooling system, and a seven-way valve; the battery temperature control system includes a power battery branch and a heating and evaporation branch; the heat pump air conditioning system is connected to the heating and evaporation branch; the power battery branch, the heating and evaporation branch, and the electric drive cooling system are connected via the seven-way valve, and the valve operating state of the seven-way valve is switched to determine the target operating mode;

[0005] The target operating mode includes the first operating mode, the second operating mode or the third operating mode;

[0006] The first operating mode is an operating mode in which the electric drive cooling system and the heating evaporation branch are connected to form a loop through the seven-way valve, and the power battery branch is connected to form a loop through the seven-way valve;

[0007] The second operating mode is an operating mode in which the electric drive cooling system and the power battery branch are connected through the seven-way valve to form a loop, and the heating evaporation branch is connected through the seven-way valve to form a loop;

[0008] The third operating mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the electric drive cooling system forms a loop through the seven-way valve.

[0009] Preferably, the electric drive cooling system includes an isolated heat dissipation branch and a connected heat dissipation branch;

[0010] The first operating mode includes a first isolation mode and a first connection mode; the first isolation mode is an operating mode in which the isolated heat dissipation branch and the heating evaporation branch are connected through the seven-way valve to form a loop, and the power battery branch is connected through the seven-way valve to form a loop; the first connection mode is an operating mode in which the connected heat dissipation branch and the heating evaporation branch are connected through the seven-way valve to form a loop, and the power battery branch is connected through the seven-way valve to form a loop;

[0011] The second operating mode includes a second isolation mode and a second connection mode; the second isolation mode is an operating mode in which the isolated heat dissipation branch and the power battery branch are connected through the seven-way valve to form a loop, and the heating and evaporation branch is also connected through the seven-way valve to form a loop; the second connection mode is an operating mode in which the connected heat dissipation branch and the power battery branch are connected through the seven-way valve to form a loop, and the heating and evaporation branch is also connected through the seven-way valve to form a loop;

[0012] The third operating mode includes a third isolation mode and a third connection mode; the third isolation mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the isolated heat dissipation branch forms a loop through the seven-way valve; the third connection mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the connection heat dissipation branch forms a loop through the seven-way valve.

[0013] Preferably, the isolated heat dissipation branch includes a driving electric water pump and a motor assembly connected to each other;

[0014] The communicating heat dissipation branch includes a driving electric water pump, a motor assembly and a radiator that are connected to each other; one end of the radiator is connected to the motor, and the other end is connected to the seven-way valve.

[0015] Preferably, the heating evaporation branch includes a heating evaporator, a PTC heater and an evaporation electric water pump that are connected to each other.

[0016] Preferably, the heat pump air conditioning system includes a compressor, a condenser, a heating evaporator, a liquid storage tank and a valve assembly; the valve assembly includes a second stop valve and a third electronic expansion valve;

[0017] One end of the compressor is connected to the condenser, and the other end is connected to the liquid storage tank;

[0018] One end of the second stop valve is connected to the condenser, and the other end is connected to the third electronic expansion valve;

[0019] One end of the heating evaporator is connected to the third electronic expansion valve, and the other end is connected to the liquid storage tank.

[0020] Preferably, the heat pump air conditioning system further comprises an external heat exchanger; the valve assembly further comprises a first electronic expansion valve and a first stop valve;

[0021] One end of the first electronic expansion valve is connected to the condenser, and the other end is connected to the external heat exchanger;

[0022] One end of the first stop valve is connected to the external heat exchanger, and the other end is connected to the liquid storage tank.

[0023] Preferably, the heat pump air conditioning system further includes a cooling fan, and the cooling fan is arranged opposite to the radiator and the external heat exchanger.

[0024] Preferably, the heat pump air conditioning system further comprises a cooling evaporator; the valve assembly comprises a one-way valve and a second electronic expansion valve;

[0025] The inlet end of the one-way valve is connected to the external heat exchanger, and the outlet end is connected to the second electronic expansion valve and the third electronic expansion valve;

[0026] The cooling evaporator is connected to the second electronic expansion valve, and the other end is connected to the liquid storage tank.

[0027] Preferably, the heat pump air conditioning system further includes a blower, which is arranged opposite to the condenser and the cooling evaporator and is located at the air inlet of the passenger compartment.

[0028] A vehicle thermal management method, applied in the vehicle thermal management system as described above, comprises:

[0029] Collect current vehicle data;

[0030] switching the valve working state of the seven-way valve according to the current vehicle data to determine a target working mode;

[0031] According to the target operating mode, the target execution device corresponding to the target operating mode is controlled to operate.

[0032] Preferably, switching the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0033] The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, and the driving heat value corresponding to the motor assembly;

[0034] The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0035] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, switching the valve operating state of the seven-way valve and determining the first operating mode as the target operating mode;

[0036] The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes:

[0037] According to the first working mode, the condenser in the heat pump air conditioning system is controlled to heat, the radiator in the electric drive cooling system is controlled to switch the working state, and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0038] Preferably, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, switching the valve working state of the seven-way valve and determining the first working mode as the target working mode includes:

[0039] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is higher than the second heating value, switching the valve operating state of the seven-way valve and determining the first isolation mode as the target operating mode;

[0040] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is between the first heating value and the second heating value, the valve operating state of the seven-way valve is switched, and the first connection mode is determined as the target operating mode.

[0041] Preferably, switching the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0042] The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the driving heat generation corresponding to the motor assembly, and the radiator requirements;

[0043] The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0044] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode;

[0045] or,

[0046] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heat value is lower than the first heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode;

[0047] or,

[0048] If the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heating value is between the first heating value and the second heating value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode;

[0049] The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes:

[0050] According to the second working mode, the condenser in the heat pump air-conditioning system is controlled to heat or the cooling evaporator is controlled to cool, the driving electric water pump in the electric drive cooling system is controlled to switch the working state, and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0051] Preferably, the vehicle thermal management method includes:

[0052] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heating value is higher than the second heating value, and the radiator is required to not operate, or if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heating value is lower than the first heating value, and the radiator is required to not operate, switching the valve operating state of the seven-way valve and determining the second isolation mode as the target operating mode;

[0053] If the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the second connection mode is determined as the target working mode.

[0054] Preferably, switching the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0055] The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the driving heat generation corresponding to the motor assembly, and the radiator requirements;

[0056] The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0057] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode;

[0058] or,

[0059] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode;

[0060] or,

[0061] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving calorific value is not lower than the third calorific value, and the radiator requirement is to be operated or not operated, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode;

[0062] or,

[0063] If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is not less than the first heat value, and the radiator requirement is to be operated or not operated, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode;

[0064] According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are not operated; the radiator in the electric drive cooling system is controlled to switch the working state; and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0065] Preferably, the vehicle thermal management method includes:

[0066] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode;

[0067] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third connection mode as the target operating mode;

[0068] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode;

[0069] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third connection mode as the target operating mode;

[0070] If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode;

[0071] If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is greater than the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

[0072] Preferably, switching the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes:

[0073] The current vehicle data includes a current temperature control instruction, or the current vehicle data includes the current temperature control instruction and a driving heat value corresponding to the motor assembly;

[0074] The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes:

[0075] If the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heat value corresponding to the motor assembly, switching the valve working state of the seven-way valve and determining the third working mode as the target working mode;

[0076] According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are not operated; the radiator in the electric drive cooling system is controlled to switch the working state; and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0077] Preferably, if the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heat value corresponding to the motor assembly, switching the valve working state of the seven-way valve and determining the third working mode as the target working mode includes:

[0078] If the current temperature control instruction is a uniform temperature control instruction, switching the valve working state of the seven-way valve and determining the third isolation mode as the target working mode;

[0079] If the current temperature control instruction is a uniform temperature control instruction, and the driving heating value corresponding to the motor assembly is greater than the second heating value, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

[0080] An embodiment of the present invention provides a vehicle thermal management system and a vehicle thermal management method. The vehicle thermal management system can switch between different working modes by switching the valve working state of a seven-way valve, so that excess heat can be flexibly transferred between a heat pump air-conditioning system, a battery temperature control system and an electric drive cooling system, thereby effectively using excess heat, saving energy and reducing energy loss. When the battery temperature control system and the electric drive cooling system do not generate excess heat, the heat pump air-conditioning system can operate normally, and the heat pump air-conditioning system is used to provide hot air or cold air to the passenger compartment. Compared with the traditional method that requires separate heating devices or cooling devices, energy loss can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 paying any creative labor.

[0082] Figure 1 This is a schematic diagram of a target operating mode of a vehicle thermal management system according to an embodiment of the present invention;

[0083] Figure 2 is a schematic structural diagram of a vehicle thermal management system according to an embodiment of the present invention;

[0084] Figure 3 is a flow chart of a vehicle thermal management method provided by one embodiment of the present invention;

[0085] Figure 4 is another flow chart of a vehicle thermal management method provided by one embodiment of the present invention;

[0086] Figure 5 is another flow chart of a vehicle thermal management method provided by one embodiment of the present invention;

[0087] Figure 6 is another flow chart of a vehicle thermal management method provided by one embodiment of the present invention;

[0088] Figure 7 is another flow chart of a vehicle thermal management method provided by an embodiment of the present invention. Description of the drawings:

[0090] 101, first isolation mode; 102, first connection mode; 103, second isolation mode; 104, second connection mode; 105, third isolation mode; 106, third connection mode;

[0091] 1. Compressor; 2. Condenser; 3. First electronic expansion valve; 4. External heat exchanger; 5. First stop valve; 6. One-way valve; 7. Second stop valve; 8. Second electronic expansion valve; 9. Cooling evaporator; 10. Third electronic expansion valve; 11. Heating evaporator; 12. Liquid storage tank; 13. Seven-way valve; 14. Power battery; 15. Evaporation electric water pump; 16. PTC heater; 17. Drive electric water pump; 18. Charger; 19. Motor; 20. Radiator; 21. Blower; 22. Cooling fan. DETAILED DESCRIPTION

[0092] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0093] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0094] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0095] The present invention provides a vehicle thermal management system, such as Figure 1 As shown, the vehicle thermal management system includes a heat pump air-conditioning system, a battery temperature control system, an electric drive cooling system and a seven-way valve 13; the battery temperature control system includes a power battery branch and a heating evaporation branch; the heat pump air-conditioning system is connected to the heating evaporation branch; the power battery branch, the heating evaporation branch and the electric drive cooling system are connected through the seven-way valve 13, and the valve working state of the seven-way valve 13 is switched to determine the target working mode; the target working mode includes a first working mode, a second working mode or a third working mode; the first working mode is a working mode in which the electric drive cooling system and the heating evaporation branch are connected to form a loop through the seven-way valve 13, and the power battery branch is connected to form a loop through the seven-way valve 13; the second working mode is a working mode in which the electric drive cooling system and the power battery branch are connected to form a loop through the seven-way valve 13, and the heating evaporation branch is connected to form a loop through the seven-way valve 13;

[0096] The third working mode is a working mode in which the heating evaporation branch and the power battery branch are connected to form a loop through the seven-way valve 13 , and the electrically driven cooling system forms a loop through the seven-way valve 13 .

[0097] The target operating mode refers to the mode in which the vehicle thermal management system operates. The first, second, and third operating modes are achieved by switching the seven-way valve 13 to connect any two of the power battery branch, the heating and evaporation branch, and the electric drive cooling system, while the other system forms a separate circuit. This allows the vehicle thermal management system to utilize waste heat generated by the motor assembly or power battery 14 to optimize vehicle energy management.

[0098] The vehicle thermal management system of this embodiment can switch between different working modes by switching the valve working state of the seven-way valve 13, so that excess heat can be flexibly transferred between the heat pump air-conditioning system, the battery temperature control system and the electric drive cooling system, thereby effectively using excess heat, saving energy and reducing energy loss. When the battery temperature control system and the electric drive cooling system do not generate excess heat, the heat pump air-conditioning system can operate normally, and the heat pump air-conditioning system is used to provide hot air or cold air to the passenger compartment, which can effectively reduce energy loss compared to the traditional method that requires separate heating devices or cooling devices.

[0099] Specifically, in the first working mode, the electric-driven cooling system and the heating evaporation branch are connected through the seven-way valve 13 to form a loop. The excess heat generated in the electric-driven cooling system can be utilized by the heat pump air-conditioning system, and the heating evaporation branch is used to cool the electric-driven cooling system, thereby effectively using the excess heat, saving energy, reducing energy loss, ensuring better energy-saving effects of the heat pump air-conditioning system, and improving the performance of the heat pump air-conditioning system. The heat pump air-conditioning system can be used to heat the passenger compartment, and the energy consumption is greatly reduced compared to traditional heaters.

[0100] In the second working mode, the electric drive cooling system and the power battery branch are connected through the seven-way valve 13 to form a loop. The excess heat generated in the electric drive cooling system is used to heat the power battery 14, or the excess heat generated in the power battery 14 is used to heat the motor assembly. When the power battery 14 and the electric drive cooling system cannot provide heat, the heat pump air-conditioning system still uses the heating evaporation branch to provide heat to ensure the normal operation of the heat pump air-conditioning system.

[0101] In the third working mode, the heating evaporation branch and the power battery branch are connected through the seven-way valve 13 to form a loop. The heating evaporation branch can adjust the temperature of the power battery branch to heat or cool the power battery 14 to ensure the normal operation of the vehicle thermal management system. At the same time, the heat pump air-conditioning system can heat or cool according to actual needs.

[0102] In one embodiment, if Figure 1 and 2As shown, the electric drive cooling system includes an isolated heat dissipation branch and a connected heat dissipation branch; the first working mode includes a first isolation mode 101 and a first connection mode 102; the first isolation mode 101 is a working mode in which the isolated heat dissipation branch is connected to the heating evaporation branch through the seven-way valve 13 to form a loop, and the power battery branch is connected to the seven-way valve 13 to form a loop; the first connection mode 102 is a working mode in which the heat dissipation branch is connected to the heating evaporation branch through the seven-way valve 13 to form a loop, and the power battery branch is connected to the seven-way valve 13 to form a loop; the second working mode includes a second isolation mode 103 and a second connection mode 104; the second isolation mode 103 is a working mode in which the isolated heat dissipation branch is connected to the power battery branch through the seven-way valve 13 to form a loop The first working mode is a working mode in which the heating evaporation branch is connected to the power battery branch through the seven-way valve 13 to form a loop, and the heating evaporation branch is connected to the seven-way valve 13 to form a loop; the second connecting mode 104 is a working mode in which the heat dissipation branch is connected to the power battery branch through the seven-way valve 13 to form a loop, and the heating evaporation branch is connected to the seven-way valve 13 to form a loop; the third working mode includes a third isolation mode 105 and a third connecting mode 106; the third isolation mode 105 is a working mode in which the heating evaporation branch is connected to the power battery branch through the seven-way valve 13 to form a loop, and the heat dissipation branch is isolated from the heat dissipation branch through the seven-way valve 13 to form a loop; the third connecting mode 106 is a working mode in which the heating evaporation branch is connected to the power battery branch through the seven-way valve 13 to form a loop, and the heat dissipation branch is connected to the seven-way valve 13 to form a loop.

[0103] In this embodiment, the electric drive cooling system includes an isolated heat dissipation branch and a connected heat dissipation branch. This allows the operation of the isolated heat dissipation branch or the connected heat dissipation branch to be controlled based on the amount of heat generated by the electric drive cooling system and the battery temperature control system. This allows the vehicle's thermal management system to operate under different branches, precisely controlling the use of excess heat, reducing vehicle energy consumption, and improving driving range. Specifically, when the electric drive cooling system needs to dissipate heat, the connected heat dissipation branch is selected for operation, ensuring the normal operation of the vehicle's thermal management system and precisely controlling the use of excess heat, thereby reducing vehicle energy consumption. When the electric drive cooling system does not need to dissipate heat, the isolated heat dissipation branch is selected for operation, ensuring the normal operation of the vehicle's thermal management system and precisely controlling the use of excess heat, thereby reducing vehicle energy consumption.

[0104] In one embodiment, if Figure 1 and 2 As shown, the isolated heat dissipation branch includes a drive electric water pump 17 and a motor assembly connected to each other; the connected heat dissipation branch includes a drive electric water pump 17, a motor assembly and a radiator 20 connected to each other; one end of the radiator 20 is connected to the motor 19, and the other end is connected to the seven-way valve 13.

[0105] In this embodiment, the motor assembly includes a motor 19 and a charger 18 .

[0106] Specifically, the interconnected motor assembly and the driven electric water pump 17 form an isolated heat dissipation branch, which is suitable for situations where the electric drive cooling system does not need a radiator 20 to dissipate heat, that is, situations where the electric drive cooling system generates less heat; the interconnected motor assembly, radiator 20 and the driven electric water pump 17 form a connected heat dissipation branch, which is suitable for situations where the electric drive cooling system needs a radiator 20 to dissipate heat, that is, situations where the electric drive cooling system generates more heat, thereby ensuring the normal operation of the vehicle thermal management system, and accurately controlling the use of excess heat to reduce vehicle energy consumption.

[0107] In one embodiment, if Figure 1 and 2 As shown, the heating evaporation branch includes a heating evaporator 11 , a PTC heater 16 and an evaporation electric water pump 15 which are connected to each other.

[0108] In this embodiment, the heating evaporator 11 is used to absorb excess heat generated by the electric drive cooling system and / or the power battery branch, thereby effectively utilizing the excess heat and reducing energy consumption; and the PTC heater 16 is used to provide heat to heat the electric drive cooling system and / or the power battery branch, which can protect the components in the vehicle thermal management system and prevent the components from freezing and frost.

[0109] Furthermore, in extremely low temperature environments (e.g., -20°C), the heat pump air conditioning performance degrades and cannot meet the heating requirements of the passenger compartment and power battery 1414. The vehicle thermal management system provided in this embodiment can use the heating evaporation branch to heat the battery 14 and use the heating evaporation branch to provide heat to the heat pump air conditioning system to heat the passenger compartment, allowing the vehicle to continue operating in extremely low temperature environments and improving the performance of the vehicle management system.

[0110] In one embodiment, if Figure 1 and 2 As shown, the heat pump air-conditioning system includes a compressor 1, a condenser 2, a heating evaporator 11, a liquid storage tank 12 and a valve assembly; the valve assembly includes a second stop valve 7 and a third electronic expansion valve 10; one end of the compressor 1 is connected to the condenser 2, and the other end is connected to the liquid storage tank 12; one end of the second stop valve 7 is connected to the condenser 2, and the other end is connected to the third electronic expansion valve 10; one end of the heating evaporator 11 is connected to the third electronic expansion valve 10, and the other end is connected to the liquid storage tank 12.

[0111] In this embodiment, at this time, the flow direction of the refrigerant in the heat pump air-conditioning system is specifically as follows: the low-temperature and low-pressure refrigerant in the liquid storage tank 12 flows to the compressor 1; after being compressed by the compressor 1, it becomes a high-temperature and high-pressure gas, and the high-temperature and high-pressure gas flows to the condenser 2; condensation and heat release inside the condenser 2 become a medium-temperature and high-pressure liquid, and the released heat is absorbed by the surrounding air to form hot air, and the hot air is blown into the passenger compartment to heat the passenger compartment; the medium-temperature and high-pressure liquid passes through the second stop valve 7 and the third electronic expansion valve 10, and is expanded and reduced in pressure by the third electronic expansion valve 10 to form a medium-temperature and low-pressure liquid, which flows to the heating evaporator 11; the medium-temperature and low-pressure liquid is heated by the evaporator 11 to absorb excess heat to form a low-temperature and low-pressure refrigerant, which flows to the liquid storage tank 12; at this time, the heating evaporator 11 is used to absorb excess heat generated in the electric drive cooling system or the power battery branch to ensure that the heat pump air-conditioning system is heated, accurately control the use of excess heat, and reduce vehicle energy consumption.

[0112] It can be understood that the heat pump air-conditioning system usually performs heating in a low-temperature environment. At this time, the heating evaporator 11 may be frosted. The heat pump air-conditioning system of this embodiment uses the excess heat generated by the electric drive cooling system or the power battery branch for heating, and uses the condenser 2 to provide cold air for the passenger compartment, thereby improving the energy utilization efficiency of the entire vehicle and optimizing the energy use of the entire vehicle. The heating evaporator 11 absorbs the excess heat generated by the electric drive cooling system or the power battery branch to ensure that the heating evaporator 11 will not be frosted in a low-temperature environment, thereby using the excess heat to protect the heating evaporator 11.

[0113] In this embodiment, the current working state of the heat pump air-conditioning system is the heating state, so that the heat pump air-conditioning system is used to provide hot air for the passenger compartment. Any one of the first isolation mode 101, the second isolation mode 103, the third isolation mode 105, the first connection mode 102 and the third connection mode 106 is applicable to ensure the normal operation of the heat pump air-conditioning system, accurately control the use of excess heat, and reduce vehicle energy consumption.

[0114] In one embodiment, if Figure 1 and 2 As shown, the heat pump air-conditioning system also includes an external heat exchanger 4; the valve assembly also includes a first electronic expansion valve 3 and a first stop valve 5; one end of the first electronic expansion valve 3 is connected to the condenser 2, and the other end is connected to the external heat exchanger 4; one end of the first stop valve 5 is connected to the external heat exchanger 4, and the other end is connected to the liquid storage tank 12.

[0115] In this embodiment, the flow direction of the refrigerant in the heat pump air-conditioning system is specifically as follows: the low-temperature, low-pressure refrigerant in the liquid storage tank 12 flows to the compressor 1; after being compressed by the compressor 1, it becomes a high-temperature, high-pressure gas, and the high-temperature, high-pressure gas flows to the condenser 2; it condenses and releases heat inside the condenser 2 to become a medium-temperature, high-pressure liquid, and the released heat is absorbed by the surrounding air to form hot air, and the hot air is blown into the passenger compartment to heat the passenger compartment; the medium-temperature, high-pressure liquid passes through the first electronic expansion valve 3 with a preset opening, expands and reduces pressure after passing through the first electronic expansion valve 3 with a preset opening, forming a medium-temperature, low-pressure liquid, and flows into the external heat exchanger 4; the medium-temperature, low-pressure liquid exchanges heat through the external heat exchanger 4 to form a low-temperature, low-pressure refrigerant, and flows to the liquid storage tank 12.

[0116] This embodiment uses external heat exchanger 4 as an evaporator to exchange heat with the outside world, ensuring that the heat pump air conditioning system performs heating, while condenser 2 provides hot air to the passenger compartment. The preset opening refers to a pre-set opening. When the refrigerant passes through first electronic expansion valve 3 at the preset opening, it is expanded and decompressed by the first electronic expansion valve 3 at the preset opening. Conversely, when the refrigerant passes through fully-open first electronic expansion valve 3, the fully-open first electronic expansion valve 3 does not process the refrigerant.

[0117] In this embodiment, the current working state of the heat pump air-conditioning system is the heating state, so that the heat pump air-conditioning system is used to provide hot air for the passenger compartment. It is applicable to any one of the second isolation mode 103, the third isolation mode 105, the second connection mode 104 and the third connection mode 106 to accurately control the use of excess heat and reduce vehicle energy consumption.

[0118] In one embodiment, if Figure 1 and 2 As shown, the heat pump air conditioning system further includes a cooling fan 22 , which is disposed opposite to the radiator 20 and the external heat exchanger 4 .

[0119] In this embodiment, a cooling fan 22 is used to accelerate the heat dissipation effect of the radiator 20 and ensure a better heat exchange effect between the external heat exchanger 4 and the external environment. The cooling fan 22 is arranged relative to the radiator 20 and the external heat exchanger 4, which can improve the use efficiency of the cooling fan 22 and reduce costs.

[0120] In one embodiment, the heat pump air conditioning system also includes a cooling evaporator 9; the valve assembly includes a one-way valve 6 and a second electronic expansion valve 8; the inlet end of the one-way valve 6 is connected to the external heat exchanger 4, and the outlet end is connected to the second electronic expansion valve 8 and the third electronic expansion valve 10; the cooling evaporator 9 is connected to the second electronic expansion valve 8, and the other end is connected to the liquid storage tank 12.

[0121] In this embodiment, since the outlet end of the one-way valve 6 is connected to the second electronic expansion valve 8 and the third electronic expansion valve 10, the refrigerant in the heat pump air-conditioning system can flow to the second electronic expansion valve 8 through the one-way valve 6, or flow to the third electronic expansion valve 10 through the one-way valve 6; or flow to the second electronic expansion valve 8 and the third electronic expansion valve 10 through the one-way valve 6; therefore, the flow direction of the refrigerant can be divided into three paths, thereby realizing the control of the current working state of the heat pump air-conditioning system according to actual needs. For example, the current working state of the heat pump air-conditioning system can be controlled to be non-working and cooling state, thereby realizing flexible control of the heat pump air-conditioning system.

[0122] As an example, the flow direction of the refrigerant in the heat pump air-conditioning system is specifically as follows: the low-temperature, low-pressure refrigerant in the liquid storage tank 12 flows to the compressor 1; after being compressed by the compressor 1, it becomes a high-temperature, high-pressure gas, and the high-temperature, high-pressure gas flows to the fully-open first electronic expansion valve 3; the high-temperature, high-pressure gas passes through the fully-open first electronic expansion valve 3 and flows to the external heat exchanger 4; the high-temperature, high-pressure gas exchanges heat through the external heat exchanger 4 to form a medium-temperature, high-pressure liquid; the medium-temperature, high-pressure liquid enters the third electronic expansion valve 10 through the one-way valve 6 to expand and reduce pressure to form a medium-temperature, low-pressure liquid; the medium-temperature, low-pressure liquid flows to the heating evaporator 11 to form a low-temperature, low-pressure liquid, and flows to the liquid storage tank 12 through the heating evaporator 11. At this time, the heat pump air-conditioning system is not working, so that the current working state of the heat pump air-conditioning system can be controlled according to actual conditions to meet user needs.

[0123] In this embodiment, the current working state of the heat pump air conditioning system is not working, and is applicable to one of the third isolation mode 105 and the third connection mode 106 to accurately control the use of excess heat and reduce vehicle energy consumption.

[0124] As another example, the flow direction of the refrigerant in the heat pump air-conditioning system is specifically as follows: the flow direction of the refrigerant in the heat pump air-conditioning system is as follows: the low-temperature, low-pressure refrigerant in the liquid storage tank 12 flows to the compressor 1; after being compressed by the compressor 1, it becomes a high-temperature, high-pressure gas, and the high-temperature, high-pressure gas flows to the fully-open first electronic expansion valve 3; the high-temperature, high-pressure gas passes through the fully-open first electronic expansion valve 3 and flows to the external heat exchanger 4; the high-temperature, high-pressure gas exchanges heat through the external heat exchanger 4 to form a medium-temperature, high-pressure liquid; the medium-temperature, high-pressure liquid is divided into two paths, one of which enters through the one-way valve 6 The liquid enters the third electronic expansion valve 10 for expansion and decompression to form a medium-temperature, low-pressure liquid. The medium-temperature, low-pressure liquid flows to the heating evaporator 11 to form a low-temperature, low-pressure liquid, and then flows to the liquid storage tank 12 through the heating evaporator 11; the other way expands and decompresses through the second electronic expansion valve 8 to form a medium-temperature, low-pressure liquid. The medium-temperature, low-pressure liquid flows to the cooling evaporator 9 to form a low-temperature, low-pressure liquid, and then flows to the liquid storage tank 12 through the cooling evaporator 9. At this time, the current working state of the heat pump air-conditioning system is the cooling system, and the cooling evaporator 9 is used to provide cold air for the passenger compartment.

[0125] In this embodiment, the current working state of the heat pump air-conditioning system is a cooling state, which is applicable to one of the third isolation mode 105 and the third connection mode 106 to accurately control the use of excess heat and reduce vehicle energy consumption.

[0126] As another example, the flow direction of the refrigerant in the heat pump air-conditioning system is specifically as follows: the low-temperature, low-pressure refrigerant in the liquid storage tank 12 flows to the compressor 1; after being compressed by the compressor 1, it becomes a high-temperature, high-pressure gas, and the high-temperature, high-pressure gas flows to the fully-open first electronic expansion valve 3; the high-temperature, high-pressure gas passes through the fully-open first electronic expansion valve 3 and flows to the external heat exchanger 4; the high-temperature, high-pressure gas exchanges heat through the external heat exchanger 4 to form a medium-temperature, high-pressure liquid; the medium-temperature, high-pressure liquid expands and reduces pressure through the second electronic expansion valve 8 to form a medium-temperature, low-pressure liquid, and the medium-temperature, low-pressure liquid flows to the cooling evaporator 9 to form a low-temperature, low-pressure liquid, and flows through the cooling evaporator 9 to the liquid storage tank 12. At this time, the current working state of the heat pump air-conditioning system is the cooling state, and the cooling evaporator 9 is used to provide cold air for the passenger compartment.

[0127] In this embodiment, the current working state of the heat pump air conditioning system is the cooling state, which is suitable for the second communication mode 104 to accurately control the use of excess heat and reduce vehicle energy consumption.

[0128] In this embodiment, when the first electronic expansion valve 3 is fully open, it does not process the refrigerant. At this point, the external heat exchanger 4 functions as the condenser 2, exchanging heat with the external environment to ensure the proper operation of the heat pump air conditioning system. It is understood that the external heat exchanger 4 can function as either the condenser 2 or the evaporator, depending on the actual situation. Therefore, the external heat exchanger 4 is reusable, thereby reducing the number of components and costs of the system.

[0129] In one embodiment, the heat pump air conditioning system further includes a blower 21 , which is disposed opposite to the condenser 2 and the cooling evaporator 9 and is located at the air inlet of the passenger compartment.

[0130] In this embodiment, the blower 21 is used to blow hot air into the passenger compartment to ensure a better effect of providing hot air to the passenger compartment.

[0131] The vehicle thermal management system provided by the present invention can reduce the number of components of the vehicle thermal management system by using the seven-way valve 13. It does not require the cooperation of other valves to realize the flexible transfer of heat between the heat pump air-conditioning system, the battery temperature control system and the electric drive cooling system, which can effectively reduce the cost of the vehicle thermal management system. At the same time, it makes the vehicle thermal management system simple in structure and easy to control; and according to actual conditions, it can flexibly control the current working state of the heat pump air-conditioning system to improve vehicle performance, and the external heat exchanger 4 in the heat pump air-conditioning system can be used as a condenser 2 or an evaporator according to actual needs, thereby reducing the components of the system and reducing costs.

[0132] The present invention provides a vehicle thermal management method, such as Figure 3 As shown, the vehicle thermal management system applied in the above embodiment includes:

[0133] S301: Collect current vehicle data.

[0134] The vehicle current data refers to the data corresponding to the vehicle at the current moment, specifically including the actual ambient temperature, the actual battery temperature and the driving heat value, or the actual ambient temperature, the actual battery temperature, the driving heat value and the radiator 20, etc.

[0135] The actual ambient temperature refers to the temperature of the vehicle's environment. In the present invention, a first ambient temperature and a second ambient temperature are pre-set, which are not limited herein. The first ambient temperature is lower than the second ambient temperature. For example, the first ambient temperature may be 15°C and the second ambient temperature may be 30°C. When the actual ambient temperature is lower than the first ambient temperature, it is considered a low-temperature environment, and the heating evaporator 11 needs to be protected to prevent frost. Furthermore, the heat pump air conditioning system can be controlled to operate in a heating mode to provide hot air to the passenger compartment. In this case, the heating evaporator 11 can absorb heat generated by the electric drive cooling system and / or the battery temperature control system, vaporizing the refrigerant in the heat pump air conditioning system. This excess heat is then utilized to effectively improve the performance of the heat pump air conditioning system. When the actual ambient temperature is between the first and second ambient temperatures, it is considered a normal temperature state. The heat pump air conditioning system can be controlled to operate in a heating or cooling mode, enabling flexible control of the heat pump air conditioning system. When the actual ambient temperature is higher than the second ambient temperature, it is considered a high-temperature state, and the heat pump air conditioning system can be controlled to operate in an inactive or cooling mode.

[0136] The actual battery temperature is the temperature generated by the operation of the power battery 14. In the present invention, a first battery temperature, a second battery temperature, and a third battery calorific value are pre-set, with the first battery temperature being lower than the second battery temperature, and the second battery temperature being lower than the third battery calorific value. When the actual battery temperature is lower than the first battery temperature, the power battery 14 requires heating. When the actual battery temperature is between the first and second battery temperatures, the power battery 14 requires neither heating nor cooling. When the actual battery temperature is between the second and third battery calorific values, the power battery 14 generates less heat and requires cooling. When the actual battery temperature is higher than the third battery calorific value, the power battery 14 generates more heat and requires cooling.

[0137] The driving heat value is the temperature generated by the operation of the motor assembly (i.e., the charger 18 and the driving assembly). In the present invention, a first heat value and a second heat value are pre-set, and the first heat value is less than the second heat value. When the driving heat value is less than the first heat value, no cooling is required; when the driving heat value is between the first and second heat values, the motor assembly generates less heat and requires cooling or an electric drive cooling system for internal circulation insulation; when the driving heat value is greater than the second heat value, the motor assembly generates more heat and requires cooling.

[0138] S302: Switching the valve working state of the seven-way valve according to the current vehicle data to determine the target working mode.

[0139] In this embodiment, the valve working state of the seven-way valve 13 is switched according to the current vehicle data to flexibly utilize the excess heat generated by the electric drive cooling system and the battery temperature control system, thereby improving the energy utilization efficiency of the entire vehicle, reducing vehicle power consumption, and increasing cruising range.

[0140] S303: According to the target operating mode, control the target execution device corresponding to the target operating mode to operate.

[0141] The target execution device is a device that constitutes the vehicle thermal management system, including but not limited to a valve assembly, a condenser 2 and a heating evaporator 11 .

[0142] In the vehicle thermal management method provided in this embodiment, the valve working state of the seven-way valve 13 is switched according to the current data of the vehicle, and the target working mode is determined. According to the target working mode, the target actuator corresponding to the target working mode is controlled to operate. Therefore, the vehicle thermal management system can operate in multiple working modes to realize the flexible transfer of heat between the heat pump air-conditioning system, the battery temperature control system and the electric drive cooling system, which can effectively reduce the cost of the vehicle thermal management system and make the vehicle thermal management system simple in structure and easy to control.

[0143] As an example, Figure 4As shown, steps S302 and S303, i.e., switching the valve working state of the seven-way valve according to the current vehicle data, determine the target working mode. According to the target working mode, controlling the target actuator corresponding to the target working mode to work, includes:

[0144] S401: The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, and the driving heat generation corresponding to the motor assembly.

[0145] S402: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, the valve operating state of the seven-way valve is switched, and the first operating mode is determined as the target operating mode.

[0146] S403: According to the first working mode, the condenser in the heat pump air conditioning system is controlled to heat, the radiator in the electric drive cooling system is controlled to switch the working state, and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0147] In this embodiment, if the actual ambient temperature is lower than the first ambient temperature, it is a low-temperature environment and the heating evaporator 11 may be frosted. It is necessary to use a heat pump air-conditioning system to provide warm air for the passenger compartment, and use the heat generated by the power battery 14 or the motor 19 to supply the heating evaporator 11 to prevent the heating evaporator 11 from frosting; if the actual battery temperature is between the first battery temperature and the second battery temperature, the power battery 14 does not need to be heated or cooled; if the driving heat generated by the motor 19 is greater than the second driving heat, the motor 19 needs to be cooled, and the heat generated by the motor 19 is sufficient for the heating evaporator 11 to operate; at this time, the first working mode is determined as the target working mode, that is, the electric drive cooling system and the heating evaporation branch form a loop, and the power battery branch forms a separate loop.

[0148] Specifically, the working process of the target execution device of the vehicle thermal management system is: controlling the second stop valve 7 and the third electronic expansion valve 10 to open, controlling the compressor 1, condenser 2, heating evaporator 11, liquid storage tank 12, driving the electric water pump 17 and the blower 21 to work, thereby driving the electric water pump 17 to drive the coolant to flow through the motor 19 to cool the motor 19, and the heated coolant flows through the heating evaporator 11, which can protect the heating evaporator 11 and avoid frosting of the heating evaporator 11; and the heating evaporator 11 absorbs excess heat, cools the heated coolant, and ensures the normal operation of the heat pump air-conditioning system, effectively improves the utilization efficiency of excess heat, saves energy, can improve the performance of the heat pump air-conditioning system, and improves the energy utilization efficiency of the entire vehicle, thereby increasing the cruising range of the electric vehicle.

[0149] The vehicle thermal management method provided in this embodiment switches the operating state of seven-way valve 13, establishing the first operating mode as the target operating mode, when the actual ambient temperature is less than a first ambient temperature, the actual battery temperature is between the first and second battery temperatures, and the driving heating value is not less than the first heating value. Based on the first operating mode, the condenser 2 in the heat pump air conditioning system is controlled to heat, the electric water pump 17 in the electrically driven cooling system is controlled to switch operating states, and the heating evaporator 11 in the heating evaporation branch is controlled to switch operating states. This improves the energy efficiency of the vehicle, enhances the performance of the heat pump air conditioning system, and increases the range of the electric vehicle.

[0150] As an example, step S302, i.e., if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, switching the valve operating state of the seven-way valve and determining the first operating mode as the target operating mode, includes:

[0151] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is higher than the second heating value, the valve working state of the seven-way valve 13 is switched, and the first isolation mode 101 is determined as the target working mode.

[0152] In this embodiment, the driving heating value is greater than the second heating value. At this time, the driving heating value is sufficient to heat the second evaporator 11. Therefore, the radiator 20 is not controlled to operate, and the first isolation mode 101 is determined as the target operating mode.

[0153] If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is between the first heating value and the second heating value, the valve working state of the seven-way valve 13 is switched, and the first communication mode 102 is determined as the target working mode.

[0154] In this embodiment, the driving heating value is between the first heating value and the second heating value, which is insufficient to heat the second evaporator 11. In this embodiment, the radiator 20 is controlled to operate, and the first isolation mode 101 is determined as the target operating mode, so that the radiator 20 and the motor assembly are used to provide heat for the second evaporator 11, ensuring that the heat pump air-conditioning system can operate normally, realizing accurate utilization of excess heat, and improving energy efficiency.

[0155] The vehicle thermal management method provided in this embodiment controls the operation or non-operation of the radiator 20 according to the driving heat generated by the motor assembly to ensure that the heat pump air conditioning system can operate normally, accurately utilize excess heat, and improve energy efficiency.

[0156] As an example, Figure 5 As shown, steps S302 and S303, i.e., switching the valve working state of the seven-way valve according to the current vehicle data to determine the target working mode; and controlling the target actuator corresponding to the target working mode according to the target working mode, include:

[0157] S501: The vehicle's current data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the drive heat generation corresponding to the motor assembly, and the radiator requirements.

[0158] S502: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator requirement is that no work is required, then the valve working state of the seven-way valve is switched, and the second working mode is determined as the target working mode; or, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heat value is lower than the first heat value, and the radiator requirement is that no work is required, then the valve working state of the seven-way valve is switched, and the second working mode is determined as the target working mode; or, if the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that work is required, then the valve working state of the seven-way valve is switched, and the second working mode is determined as the target working mode.

[0159] In this embodiment, in the second operating mode, the electric drive cooling system and the power battery branch are connected through the seven-way valve 13 to form a loop, and the heating evaporation branch is also connected through the seven-way valve 13 to form a loop. Therefore, this operating mode is applicable to situations where the power battery 14 needs to be heated while the electric drive cooling system needs to be cooled; or it is applicable to situations where the power battery 14 and the electric drive cooling system do not need to be heated or cooled; or it is applicable to situations where the power battery 14 does not need to be heated or cooled, while a small amount of heat is generated in the electric drive cooling system and can be dissipated through the radiator 20. This ensures that the cooling battery temperature control system and the electric drive cooling system operate normally, and when the cooling battery temperature control system and the electric drive cooling system are unable to provide heat, the heat pump air conditioning system can use the PTC to provide heat to ensure the normal operation of the heat pump air conditioning system, thereby transferring excess heat between the power battery 14 and the electric drive cooling system, saving energy, reducing energy loss, and improving the efficiency of normal heat use.

[0160] S503: According to the second working mode, control the condenser in the heat pump air conditioning system to heat or the cooling evaporator to cool, control the radiator in the electric drive cooling system to switch the working state, and control the heating evaporator in the heating evaporation branch to switch the working state.

[0161] The second working mode controls the condenser 2 in the heat pump air-conditioning system to provide hot air to the passenger compartment, or controls the cooling evaporator 9 for cooling to provide cold air to the passenger compartment; it can be understood that when the power battery 14 and the electric drive cooling system do not need heating and cooling, the electric water pump 17 is driven not to work.

[0162] The vehicle thermal management method provided in this embodiment is as follows: if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator 20 is not working, the valve working state of the seven-way valve 13 is switched, and the second working mode is determined as the target working mode; or, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heat value is lower than the first heat value, and the radiator 20 is not working, the valve working state of the seven-way valve 13 is switched, and the second working mode is determined as the target working mode; or, if the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator 20 is working, the valve working state of the seven-way valve 13 is switched, and the second working mode is determined as the target working mode. According to the second working mode, the condenser 2 in the heat pump air-conditioning system is controlled to heat or the cooling evaporator 9 is controlled to cool, the driving electric water pump 17 in the electric drive cooling system is controlled to switch the working state, and the heating evaporator 11 in the heating evaporation branch is controlled to switch the working state, so as to achieve the normal operation of the cooling battery temperature control system and the electric drive cooling system. When the cooling battery temperature control system and the electric drive cooling system cannot provide heat, the heat pump air-conditioning system can use PTC to provide heat to ensure the normal operation of the heat pump air-conditioning system, thereby realizing the transfer of excess heat between the power battery 14 and the electric drive cooling system, saving energy, reducing energy loss, and improving the normal heat utilization efficiency.

[0163] As an embodiment, step S502 includes the following examples:

[0164] As an example, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to not work, or if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heat value is lower than the first heat value, and the radiator is required to not work, then the valve working state of the seven-way valve is switched, and the second isolation mode is determined as the target working mode.

[0165] In this embodiment, the second isolation mode 103 is applicable to the case where the power battery 14 needs to be heated and the electric drive cooling system needs to be cooled; or applicable to the case where the power battery 14 and the electric drive cooling system do not need to be heated or cooled.

[0166] As another example, if the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the second connection mode is determined as the target working mode.

[0167] In this embodiment, the second connection mode 104 is applicable to the situation where the power battery 14 does not need to be heated or cooled, but the electric drive cooling system generates a small amount of heat that can be dissipated through the radiator 20 .

[0168] The vehicle thermal management method provided in this embodiment enters the second isolation mode 103 or the second connection mode 104 according to different current vehicle data to accurately control the use of excess heat and reduce vehicle energy consumption.

[0169] As an example, Figure 6 As shown, steps S302 and S303, i.e., switching the valve working state of the seven-way valve according to the current vehicle data to determine the target working mode; and controlling the target actuator corresponding to the target working mode according to the target working mode, include:

[0170] S601: The vehicle's current data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the drive heat generation corresponding to the motor assembly, and the radiator requirements;

[0171] S602: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heating value is between the first heating value and the second heating value, and the radiator requirement is that the radiator does not need to operate, the valve operating state of the seven-way valve is switched, and the third operating mode is determined as the target operating mode; or, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heating value is higher than the second heating value, and the radiator requirement is that the radiator needs to operate, the valve operating state of the seven-way valve is switched, and the third operating mode is determined as the target operating mode; or, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heating value is not lower than the third heating value, and the radiator requirement is that the radiator needs to operate or not operate, the valve operating state of the seven-way valve is switched, and the third operating mode is determined as the target operating mode; or, if the actual ambient temperature is higher than the second ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heating value is not lower than the first heating value, and the radiator requirement is that the radiator needs to operate or not operate, the valve operating state of the seven-way valve is switched, and the third operating mode is determined as the target operating mode.

[0172] In this embodiment, in the third operating mode, the heating evaporation branch and the power battery branch are connected via the seven-way valve 13 to form a loop, which is suitable for situations where the power battery requires cooling or heating. When the power battery requires cooling, the PTC heater 16 in the heating evaporation branch is used to provide heat to the power battery. When the power battery generates excess heat, this excess heat is used to provide heat to the heat pump air conditioning system, thereby improving the energy efficiency of the entire vehicle and increasing the range of the electric vehicle. Furthermore, in the operating mode in which the electric drive cooling system forms a loop via the seven-way valve 13, the electric drive cooling system does not require cooling or heating, or can utilize the radiator 20 for heat dissipation. In this embodiment, the heating evaporation branch can regulate the temperature of the power battery branch to ensure the normal operation of the vehicle's thermal management system. Simultaneously, the heat pump air conditioning system utilizes excess heat generated by the power battery 14 for heating or cooling according to actual needs, thereby improving the energy efficiency of the entire vehicle and increasing the range of the electric vehicle.

[0173] S603: According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are controlled not to work; the radiator in the electric drive cooling system is controlled to switch the working state; and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0174] The vehicle thermal management method provided in this embodiment controls the condenser 2 in the heat pump air-conditioning system to heat, or the cooling evaporator 9 to cool, or the condenser 2 and the cooling evaporator 9 to not work according to the third working mode; controls the radiator 20 in the electric drive cooling system to switch the working state; controls the heating evaporator 11 in the heating evaporation branch to switch the working state. In the third working mode, the heating evaporation branch can adjust the temperature of the power battery branch to ensure the normal operation of the vehicle thermal management system. At the same time, the heat pump air-conditioning system uses the excess heat generated by the power battery 14 for heating or cooling according to actual needs to improve the energy utilization efficiency of the entire vehicle and increase the cruising range of the electric vehicle.

[0175] As an embodiment, step S602 includes the following examples:

[0176] As an example, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, the valve operating state of the seven-way valve is switched, and the third isolation mode is determined as the target operating mode;

[0177] In this example, the third isolation mode 105 is determined as the target operating mode, and the heating evaporation branch and the power battery branch are connected to form a loop through the seven-way valve 13. The PTC heater 16 of the heating evaporation branch can provide heat for the heat pump air-conditioning system and the power battery 14 to ensure the normal operation of the heat pump air-conditioning system and the power battery 14; the heat dissipation branch is isolated to form a loop, and the electric drive cooling system performs internal circulation insulation to ensure the normal operation of the electric drive cooling system.

[0178] As an example, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is greater than the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

[0179] In this example, the third connection mode 106 is determined as the target operating mode, and the heating evaporation branch is connected to the power battery branch through the seven-way valve 13 to form a loop. The PTC heater 16 of the heating evaporation branch can provide heat for the heat pump air-conditioning system and the power battery 14 to ensure the normal operation of the heat pump air-conditioning system and the power battery 14; the heat dissipation branch is connected to form a loop, and the radiator 20 can dissipate heat for the motor assembly to ensure the normal operation of the electric drive cooling system.

[0180] As an example, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator is required to not work, the valve working state of the seven-way valve is switched, and the third isolation mode is determined as the target working mode.

[0181] In this example, the third isolation mode 105 is determined as the target operating mode. The heating evaporation branch and the power battery branch are connected via the seven-way valve 13 to form a loop. The PTC heater 16 in the heating evaporation branch is then deactivated. At this point, if the actual ambient temperature is lower than the first ambient temperature, the heat pump air conditioning system begins heating. The significant heat generated by the power battery 14 can provide heat for the cooling evaporator 9 in the heat pump air conditioning system. The cooling evaporator 9 in the heat pump air conditioning system can then cool the power battery 14, improving the vehicle's heat utilization efficiency and the performance of the heat pump air conditioning system. Heat can be provided to both the heat pump air conditioning system and the power battery 14 to ensure their normal operation. The heat dissipation branch is isolated to form a loop, and the electric drive cooling system performs internal circulation insulation to ensure its normal operation.

[0182] As an example, if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

[0183] In this example, third connection mode 106 is determined as the target operating mode. The heating evaporation branch and the power battery branch are connected via seven-way valve 13 to form a loop. The PTC heater 16 in the heating evaporation branch is deactivated. At this point, if the actual ambient temperature is lower than the first ambient temperature, the heat pump air conditioning system performs heating. The significant heat generated by power battery 14 can provide heat for the cooling evaporator 9 in the heat pump air conditioning system, which in turn cools power battery 14, improving the vehicle's heat utilization efficiency and the performance of the heat pump air conditioning system. The heat dissipation branch is connected to form a loop, allowing radiator 20 to dissipate heat from the motor assembly to ensure the proper operation of the electric drive cooling system.

[0184] As an example, if the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator is required to not work, the valve working state of the seven-way valve is switched, and the third isolation mode is determined as the target working mode.

[0185] In this example, the third isolation mode 105 is determined as the target operating mode. The heating evaporation branch and the power battery branch are connected via the seven-way valve 13 to form a loop. The PTC heater 16 in the heating evaporation branch is then deactivated. At this point, the actual ambient temperature is greater than the second ambient temperature, and the heat pump air conditioning system performs cooling. The significant heat generated by the power battery 14 can provide heat for the operation of the cooling evaporator 9 in the heat pump air conditioning system. The cooling evaporator 9 in the heat pump air conditioning system can cool the power battery 14, improving the vehicle's heat utilization efficiency and the performance of the heat pump air conditioning system. Heat can be provided to both the heat pump air conditioning system and the power battery 14 to ensure their normal operation. The heat dissipation branch is isolated to form a loop, and the electric drive cooling system performs internal circulation insulation to ensure its normal operation.

[0186] As an example, if the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is greater than the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

[0187] In this example, third connection mode 106 is determined as the target operating mode. The heating and evaporation branch is connected to the power battery branch via seven-way valve 13 to form a loop. The PTC heater 16 in the heating and evaporation branch is deactivated. At this point, if the actual ambient temperature is greater than the second ambient temperature, the heat pump air conditioning system performs cooling or is deactivated. The high heat generated by power battery 14 can provide heat for the cooling evaporator 9 in the heat pump air conditioning system, which in turn cools power battery 14, improving the vehicle's heat utilization efficiency and the performance of the heat pump air conditioning system. The heat dissipation branch is connected to form a loop, allowing radiator 20 to dissipate heat from the motor assembly, ensuring the proper operation of the electric drive cooling system.

[0188] The vehicle thermal management method provided in this embodiment determines the target operating mode of the vehicle thermal management system based on the actual ambient temperature, the actual battery temperature, the driving heat generation, and the radiator 20 to improve the heat utilization efficiency of the entire vehicle and improve the performance of the heat pump air conditioning system.

[0189] As an example, Figure 7 As shown, steps S302 and S303, i.e., switching the valve working state of the seven-way valve according to the current vehicle data to determine the target working mode; and controlling the target actuator corresponding to the target working mode according to the target working mode, include:

[0190] S701: The current vehicle data includes a current temperature control instruction, or the current vehicle data includes the current temperature control instruction and a driving heat value corresponding to the motor assembly.

[0191] The current temperature control instruction is an instruction for controlling the power battery 14 to achieve uniform temperature.

[0192] S702: If the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heating value corresponding to the motor assembly, the valve working state of the seven-way valve is switched, and the third working mode is determined as the target working mode.

[0193] In this embodiment, when the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heat value corresponding to the motor assembly, the third operating mode is used as the target operating mode to improve control efficiency; it can be understood that at this time, other components of the vehicle thermal management system can work or not work according to actual needs.

[0194] S703: According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are controlled not to work; the radiator in the electric drive cooling system is controlled to switch the working state; the heating evaporator in the heating evaporation branch is controlled to switch the working state.

[0195] In this embodiment, in the third working mode, other components of the vehicle thermal management system can work or not work according to actual needs, which is highly flexible.

[0196] In the vehicle thermal management method provided in this embodiment, if the current temperature control command is a uniform temperature control command, or if the current vehicle data includes the current temperature control command and the corresponding drive heat output of the motor assembly, the operating state of seven-way valve 13 is switched, and the third operating mode is determined as the target operating mode to improve control efficiency. Based on the third operating mode, the condenser 2 in the heat pump air conditioning system is controlled to heat, the cooling evaporator 9 is controlled to cool, or both the condenser 2 and the cooling evaporator 9 are controlled to be inactive; the radiator 20 in the electrically driven cooling system is controlled to switch operating states; and the heating evaporator 11 in the heating evaporation branch is controlled to switch operating states, providing greater flexibility.

[0197] In one embodiment, step S702 includes the following examples:

[0198] As an example, if the current temperature control instruction is a uniform temperature control instruction, the third isolation mode is determined as the target operating mode.

[0199] In this example, when the third isolation mode 105 is determined as the target operating mode, the heating evaporation branch and the power battery branch are connected through the seven-way valve 13 to form a loop, so that the heating evaporator 11 of the heating evaporation branch can be used to cool the power battery 14, or the PTC heater 16 can provide heat to the power battery 14 to keep the power battery 14 at a uniform temperature.

[0200] As another example, if the current data of the vehicle includes a current temperature control instruction, and the driving heating value corresponding to the motor assembly is greater than the second heating value, the third connection mode is determined as the target operating mode.

[0201] In this example, when third connection mode 106 is determined as the target operating mode, the heating evaporation branch and the power battery branch are connected via seven-way valve 13 to form a loop. This allows the heating evaporator 11 of the heating evaporation branch to cool the power battery 14, or the PTC heater 16 to provide heat to the power battery 14, thereby maintaining a uniform temperature. If the corresponding driving heat value of the motor assembly is greater than the second heat value, the radiator 20 is used to dissipate heat from the motor assembly to ensure normal operation of the motor assembly.

[0202] The vehicle thermal management method provided in this embodiment determines the target operating mode of the vehicle thermal management system based on the current temperature control instruction, or the current temperature control instruction and the driving heat value corresponding to the motor assembly, to ensure that the vehicle thermal management system can operate normally.

[0203] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A vehicle thermal management system, characterized in that: The system comprises a heat pump air conditioning system, a battery temperature control system, an electric drive cooling system, and a seven-way valve; the battery temperature control system comprises a power battery branch and a heating evaporation branch; the heat pump air conditioning system is connected to the heating evaporation branch; the power battery branch, the heating evaporation branch, and the electric drive cooling system are connected via the seven-way valve, and the valve operating state of the seven-way valve is switched to determine the target operating mode; The target operating mode includes the first operating mode, the second operating mode or the third operating mode; The first operating mode is an operating mode in which the electric drive cooling system and the heating evaporation branch are connected to form a loop through the seven-way valve, and the power battery branch is connected to form a loop through the seven-way valve; The second operating mode is an operating mode in which the electric drive cooling system and the power battery branch are connected through the seven-way valve to form a loop, and the heating evaporation branch is connected through the seven-way valve to form a loop; The third operating mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the electric drive cooling system forms a loop through the seven-way valve.

2. The vehicle thermal management system according to claim 1, wherein: The electric drive cooling system includes an isolated heat dissipation branch and a connected heat dissipation branch; The first operating mode includes a first isolation mode and a first connection mode; the first isolation mode is an operating mode in which the isolated heat dissipation branch and the heating evaporation branch are connected through the seven-way valve to form a loop, and the power battery branch is connected through the seven-way valve to form a loop; the first connection mode is an operating mode in which the connected heat dissipation branch and the heating evaporation branch are connected through the seven-way valve to form a loop, and the power battery branch is connected through the seven-way valve to form a loop; The second operating mode includes a second isolation mode and a second connection mode; the second isolation mode is an operating mode in which the isolated heat dissipation branch and the power battery branch are connected through the seven-way valve to form a loop, and the heating and evaporation branch is also connected through the seven-way valve to form a loop; the second connection mode is an operating mode in which the connected heat dissipation branch and the power battery branch are connected through the seven-way valve to form a loop, and the heating and evaporation branch is also connected through the seven-way valve to form a loop; The third operating mode includes a third isolation mode and a third connection mode; the third isolation mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the isolated heat dissipation branch forms a loop through the seven-way valve; the third connection mode is an operating mode in which the heating evaporation branch and the power battery branch are connected through the seven-way valve to form a loop, and the connection heat dissipation branch forms a loop through the seven-way valve.

3. The vehicle thermal management system according to claim 2, wherein: The isolated heat dissipation branch includes a driving electric water pump and a motor assembly connected to each other; The communicating heat dissipation branch includes a driving electric water pump, a motor assembly and a radiator that are connected to each other; one end of the radiator is connected to the motor, and the other end is connected to the seven-way valve.

4. The vehicle thermal management system according to claim 3, wherein: The heating evaporation branch includes a heating evaporator, a PTC heater and an evaporation electric water pump which are connected to each other.

5. The vehicle thermal management system according to claim 4, wherein: The heat pump air conditioning system includes a compressor, a condenser, a heating evaporator, a liquid storage tank and a valve assembly; the valve assembly includes a second stop valve and a third electronic expansion valve; One end of the compressor is connected to the condenser, and the other end is connected to the liquid storage tank; One end of the second stop valve is connected to the condenser, and the other end is connected to the third electronic expansion valve; One end of the heating evaporator is connected to the third electronic expansion valve, and the other end is connected to the liquid storage tank.

6. The vehicle thermal management system according to claim 5, wherein: The heat pump air conditioning system further comprises an external heat exchanger; the valve assembly further comprises a first electronic expansion valve and a first stop valve; One end of the first electronic expansion valve is connected to the condenser, and the other end is connected to the external heat exchanger; One end of the first stop valve is connected to the external heat exchanger, and the other end is connected to the liquid storage tank.

7. The vehicle thermal management system according to claim 6, wherein: The heat pump air conditioning system further includes a cooling fan, which is arranged opposite to the radiator and the external heat exchanger.

8. The vehicle thermal management system according to claim 6, wherein: The heat pump air conditioning system further comprises a cooling evaporator; the valve assembly comprises a one-way valve and a second electronic expansion valve; The inlet end of the one-way valve is connected to the external heat exchanger, and the outlet end is connected to the second electronic expansion valve and the third electronic expansion valve; The cooling evaporator is connected to the second electronic expansion valve, and the other end is connected to the liquid storage tank.

9. The vehicle thermal management system according to claim 8, wherein: The heat pump air conditioning system further includes a blower, which is arranged opposite to the condenser and the cooling evaporator and is located at the air inlet of the passenger compartment.

10. A vehicle thermal management method, applied to the vehicle thermal management system according to any one of claims 2 to 9, characterized in that: include: Collect current vehicle data; switching the valve working state of the seven-way valve according to the current vehicle data to determine a target working mode; According to the target operating mode, the target execution device corresponding to the target operating mode is controlled to operate.

11. The vehicle thermal management method according to claim 10, wherein: The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, and the driving heat value corresponding to the motor assembly; The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, switching the valve operating state of the seven-way valve and determining the first operating mode as the target operating mode; The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes: According to the first working mode, the condenser in the heat pump air conditioning system is controlled to heat, the radiator in the electric drive cooling system is controlled to switch the working state, and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

12. The vehicle thermal management method according to claim 11, wherein: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is not lower than the first heating value, switching the valve working state of the seven-way valve and determining the first working mode as the target working mode includes: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is higher than the second heating value, switching the valve operating state of the seven-way valve and determining the first isolation mode as the target operating mode; If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, and the driving heating value is between the first heating value and the second heating value, the valve operating state of the seven-way valve is switched, and the first connection mode is determined as the target operating mode.

13. The vehicle thermal management method according to claim 10, wherein: The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the driving heat generation corresponding to the motor assembly, and the radiator requirements; The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode; or, If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heat value is lower than the first heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode; or, If the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heating value is between the first heating value and the second heating value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the second operating mode as the target operating mode; The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes: According to the second working mode, the condenser in the heat pump air-conditioning system is controlled to heat or the cooling evaporator is controlled to cool, the driving electric water pump in the electric drive cooling system is controlled to switch the working state, and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

14. The vehicle thermal management method according to claim 13, wherein: The vehicle thermal management method comprises: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heating value is higher than the second heating value, and the radiator is required to not operate, or if the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is between the first battery temperature and the second battery temperature, the driving heating value is lower than the first heating value, and the radiator is required to not operate, switching the valve operating state of the seven-way valve and determining the second isolation mode as the target operating mode; If the actual ambient temperature is between the first ambient temperature and the second ambient temperature, the actual battery temperature is between the second battery temperature and the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the second connection mode is determined as the target working mode.

15. The vehicle thermal management method according to claim 10, wherein: The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: The current vehicle data includes the actual ambient temperature, the actual battery temperature corresponding to the power battery branch, the driving heat generation corresponding to the motor assembly, and the radiator requirements; The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode; or, If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode; or, If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving calorific value is not lower than the third calorific value, and the radiator requirement is to be operated or not operated, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode; or, If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is not less than the first heat value, and the radiator requirement is to be operated or not operated, switching the valve operating state of the seven-way valve and determining the third operating mode as the target operating mode; According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are not operated; the radiator in the electric drive cooling system is controlled to switch the working state; and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

16. The vehicle thermal management method according to claim 15, wherein: The vehicle thermal management method comprises: If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode; If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is lower than the first battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third connection mode as the target operating mode; If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode; If the actual ambient temperature is lower than the first ambient temperature, the actual battery temperature is higher than the third battery temperature, the driving heat value is higher than the second heat value, and the radiator is required to operate, switching the valve operating state of the seven-way valve and determining the third connection mode as the target operating mode; If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is between the first heat value and the second heat value, and the radiator requirement is that no operation is required, switching the valve operating state of the seven-way valve and determining the third isolation mode as the target operating mode; If the actual ambient temperature is greater than the second ambient temperature, the actual battery temperature is greater than the third battery temperature, the driving heat value is greater than the second heat value, and the radiator is required to work, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

17. The vehicle thermal management method according to claim 10, wherein: The switching of the valve working state of the seven-way valve and determining the target working mode according to the current vehicle data includes: The current vehicle data includes a current temperature control instruction, or the current vehicle data includes the current temperature control instruction and a driving heat value corresponding to the motor assembly; The step of controlling the target execution device corresponding to the target operation mode to operate according to the target operation mode includes: If the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heat value corresponding to the motor assembly, switching the valve working state of the seven-way valve and determining the third working mode as the target working mode; According to the third working mode, the condenser in the heat pump air-conditioning system is controlled to heat, or the cooling evaporator is controlled to cool, or the condenser and the cooling evaporator are not operated; the radiator in the electric drive cooling system is controlled to switch the working state; and the heating evaporator in the heating evaporation branch is controlled to switch the working state.

18. The vehicle thermal management method according to claim 17, wherein: If the current temperature control instruction is a uniform temperature control instruction, or the current vehicle data includes the current temperature control instruction and the driving heat value corresponding to the motor assembly, switching the valve working state of the seven-way valve and determining the third working mode as the target working mode includes: If the current temperature control instruction is a uniform temperature control instruction, switching the valve working state of the seven-way valve and determining the third isolation mode as the target working mode; If the current temperature control instruction is a uniform temperature control instruction, and the driving heating value corresponding to the motor assembly is greater than the second heating value, the valve working state of the seven-way valve is switched, and the third connection mode is determined as the target working mode.

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