Direct heat pump type thermal management system

Abstract

The invention relates to the technical field of electric vehicle heat management, in particular to a direct heat pump type heat management system. Comprising a cooling liquid loop and a refrigerant loop, and the cooling liquid loop comprises a first cooling loop used for heat management of a battery pack, a second cooling loop provided with a plate heat exchanger, a third cooling loop used for heat management of an electric drive assembly and a fourth cooling loop provided with a radiator; the first cooling loop, the second cooling loop, the third cooling loop and the fourth cooling loop are connected through a seven-way valve; the refrigerant loop comprises a first refrigerating loop used for conducting heat management on the passenger compartment, a second refrigerating loop provided with an evaporator and a third refrigerating loop connected with the plate heat exchanger. The direct heat pump type heat management system is simple in structure, heat pump heating can be achieved in the heat pump mode that a refrigerant releases heat in the indoor condenser and absorbs heat in the outdoor heat exchanger under the condition that the external air temperature is low, and the energy-saving effect of an air source heat pump is reflected to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of electric vehicles, and in particular to a direct heat pump type thermal management system. Background Art

[0002] The electrification of automobiles is one of the important measures to achieve low-carbon sustainable development. The cruising range is one of the most important indicators that electric vehicle users care about, and the attenuation of the cruising range of electric vehicles at high and low temperatures has become a major pain point. Reducing the energy consumption of the whole vehicle, especially reducing the energy consumption of high-temperature cooling and low-temperature heating, is a major technical hotspot for electric vehicles. At high temperatures, in order to solve the problem that the heat dissipation capacity of the two heat exchangers is not fully utilized due to the fact that the heat dissipation load of the coolant side radiator and the refrigerant side condenser generally does not reach the peak at the same time, and the front and rear arrangements of the two heat exchangers affect each other's heat dissipation performance, one solution is to use a water-cooled condenser to transfer the heat in the refrigerant side to the coolant side and then dissipate the heat through a larger radiator shared with the coolant side of the front module. Compared with the front and rear radiators and condensers, this radiator has a stronger heat dissipation capacity for most working conditions, reducing the power source of fluid flow, especially the energy consumption of the compressor. When heating at low temperatures, current electric vehicles generally use heat pump air conditioning systems to solve the problem of serious attenuation of cruising range due to excessive energy consumption of single PTC heating. For the current heat pump system design, in order to further reduce energy consumption, direct heat pump and waste heat recovery solutions are currently the most widely used solutions.

[0003] To address this problem, a Chinese invention patent with patent number "CN116729067A" and titled "Direct heat pump system and electric vehicle with water-cooled condenser" proposes a heat pump system, which is a direct heat pump solution, including a coolant circuit and a refrigerant circuit. The coolant circuit includes a first water pump, a warm air core, an electric heater, a second water pump, a power battery, a cooler, a third water pump, a radiator, a drive motor, a water-cooled condenser, a first valve assembly and a second valve assembly; the refrigerant circuit includes a compressor, an internal condenser, a water-cooled condenser, a first electronic expansion valve, an evaporator, a second electronic expansion valve, a cooler and a gas-liquid separator; the compressor, the internal condenser, the water-cooled condenser, the first electronic expansion valve, the evaporator, and the gas-liquid separator are connected in series to form an evaporator sub-circuit; the compressor, the internal condenser, the water-cooled condenser, the second electronic expansion valve, the cooler and the gas-liquid separator are connected in series to form a cooler sub-circuit. Under heat pump heating conditions, the cooler + radiator is used to absorb heat from the refrigerant → water → outside air, which can achieve thermal management of the passenger compartment, battery and drive motor in different application scenarios while taking into account low energy consumption and low cost.

[0004] However, the direct heat pump system also has some problems. Since the heat pump system uses secondary heat exchange, it limits the outside air temperature range and heat exchange capacity of heat pump heating, and does not give full play to the energy-saving effect of heat pump heating. Under summer cooling conditions, the water-cooled condenser + radiator is used to release heat from refrigerant → water → outside air. Since this process is also a secondary heat exchange, the heat exchange capacity is limited. At the same time, due to the water circulation in the radiator circuit, the cooling COP is reduced at this time: In addition, this solution uses a warm air core + electric heater to heat at relatively low outside temperatures, and adds passenger compartment heating water circuits and components. Due to its water circuit design, the system cannot respond to the battery pack temperature while the motor waste heat is recovered to the passenger compartment. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and provide a direct heat pump type thermal management system.

[0006] The technical solution of the present invention is: a direct heat pump type thermal management system, comprising:

[0007] A coolant circuit, the coolant circuit is used for thermal management of the electric drive assembly and the battery pack, the coolant circuit includes a first cooling circuit for thermal management of the battery pack, a second cooling circuit provided with a plate heat exchanger, a third cooling circuit for thermal management of the electric drive assembly, and a fourth cooling circuit provided with a radiator; the first cooling circuit, the second cooling circuit, the third cooling circuit, and the fourth cooling circuit are connected via a seven-way valve;

[0008] A refrigerant circuit, which is a heat pump type piping structure with a gas-liquid separator and a compressor, includes a first refrigeration circuit for thermal management of the passenger compartment, a second refrigeration circuit with an evaporator and an in-cabin heat exchanger, a third refrigeration circuit connected to a plate heat exchanger, and a fourth refrigeration circuit with an outdoor heat exchanger.

[0009] According to a direct heat pump type thermal management system provided in the present application, the first cooling circuit includes a second electronic water pump and a battery pack connected in series through pipelines; the two ends of the first cooling circuit are respectively connected to the sixth valve port and the seventh valve port of the seven-way valve.

[0010] According to a direct heat pump type thermal management system provided in the present application, the second cooling circuit includes a plate heat exchanger connected in series through a pipeline, or a water heater and a plate heat exchanger connected in series in sequence through a pipeline; the two ends of the second cooling circuit are respectively connected to the fourth valve port and the fifth valve port of the seven-way valve.

[0011] According to a direct heat pump type thermal management system provided in the present application, the third cooling circuit includes a first electronic water pump, a two-in-one module and an electric drive assembly which are connected in series in sequence through pipelines; the two ends of the third cooling circuit are respectively connected to the first valve port and the second valve port of the seven-way valve.

[0012] According to a direct heat pump type thermal management system provided in the present application, the fourth cooling circuit includes a first electronic water pump, a two-in-one module, an electric drive assembly and a radiator which are connected in series in sequence through pipelines; the two ends of the fourth cooling circuit are respectively connected to the first valve port and the third valve port of the seven-way valve.

[0013] According to a direct heat pump type thermal management system provided by the present application, the seven-way valve has a first working mode in which the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a second working mode in which the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a third working mode in which the first valve port is connected to the fifth valve port, the second valve port is connected to the fourth valve port, the sixth valve port is connected to the seventh valve port, and the third valve port is closed; and a fourth working mode in which the first valve port is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0014] According to a direct heat pump type thermal management system provided in the present application, the first refrigeration circuit includes a compressor, an in-cabin heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a one-way valve, a second solenoid valve and a gas-liquid separator which are connected in series in sequence through pipelines to form a circuit.

[0015] According to a direct heat pump type thermal management system provided in the present application, the second refrigeration circuit includes a compressor, an in-cabin heat exchanger, a first solenoid valve, a second electronic expansion valve, an evaporator and a gas-liquid separator which are sequentially connected in series through pipelines to form a circuit.

[0016] According to a direct heat pump type thermal management system provided in the present application, the third refrigeration circuit includes a compressor, an in-cabin heat exchanger, a first solenoid valve, a third electronic expansion valve, a plate heat exchanger and a gas-liquid separator which are sequentially connected in series through pipelines to form a circuit.

[0017] According to a direct heat pump type thermal management system provided by the present application, the fourth refrigeration circuit includes a first refrigeration branch that is connected in series with a second electronic expansion valve, an evaporator and a gas-liquid separator in sequence through a pipeline, and a second refrigeration branch that is connected in series with a third electronic expansion valve, a plate heat exchanger and a gas-liquid separator in sequence through a pipeline; the first refrigeration branch and the second refrigeration branch are connected in parallel with each other; the fourth refrigeration circuit is connected in series with a compressor, an in-cabin heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a one-way valve, a first refrigeration branch and / or a second refrigeration branch in sequence through a pipeline; the outdoor heat exchanger is located on one side of the radiator on the fourth cooling circuit.

[0018] According to a direct heat pump type thermal management system provided in the present application, a liquid storage pot is provided on the third cooling circuit between the electric drive assembly and the radiator.

[0019] A direct heat pump type thermal management system provided according to the present application also includes a heat dissipation fan; the heat dissipation fan is located on a side of the outdoor heat exchanger opposite to the radiator.

[0020] The advantages of this application are as follows: 1. This application is a direct heat pump type thermal management system, which can realize heat pump heating by adopting a heat pump method in which the refrigerant releases heat in the indoor condenser and absorbs heat in the outdoor heat exchanger when the external temperature is low, thereby maximizing the energy-saving effect of the air source heat pump; under low to extremely low external temperature conditions, the heating can be gradually transitioned from the air source heat pump to the water source heat pump by adjusting the electric drive assembly to generate heat or the heater from an auxiliary heat source to a main heat source; this application uses a seven-way valve to switch the coolant circuit to realize the cooling and waste heat recovery mode of the motor electronic control, the battery pack cooling, heating, and temperature equalization mode, and realizes the cooling, dehumidification, air source heat pump heating, and water source heat pump heating modes of the passenger compartment by controlling each refrigerant valve body; the entire thermal management system has the advantages of extremely small heat loss, large heating heat exchange, and obvious heating COP advantage, and is suitable for large-scale promotion and application;

[0021] 2. The first cooling circuit of the present application is used to control the flow of coolant in the battery pack. The first cooling circuit can realize cooling, heating and temperature uniformity adjustment of the battery pack by connecting with the seven-way valve, and can perform thermal management of the battery pack well. The overall control method is very simple;

[0022] 3. The second cooling circuit of the present application is a circuit coupled with the refrigerant circuit, and can perform heat exchange with the refrigerant circuit through a plate heat exchanger, and can organically combine the refrigerant circuit with the coolant circuit to achieve efficient heat utilization of the entire thermal management system;

[0023] 4. The third cooling circuit of the present application is a circuit for thermal management of the electric drive assembly. The third cooling circuit cooperates with the seven-way valve to recover the waste heat of the electric drive assembly, fully recover the heat energy of the electric drive assembly, and save energy to the greatest extent;

[0024] 5. The present application also includes a fourth cooling circuit, which includes a radiator, and can cool the electric drive assembly and the battery pack in conjunction with the seven-way valve. The electric drive assembly and the battery pack are cooled by air cooling, and the structure is simple and the operation and control are convenient.

[0025] 6. The seven-way valve of the present application has four working modes, which can realize the connection or disconnection between different cooling circuits. It can be adjusted accordingly according to the needs to realize a variety of different functions and achieve different effects. The control adjustment of the seven-way valve is very simple and easy to operate.

[0026] 7. The first refrigeration circuit of the present application has a simple structure and can be used for thermal management of the passenger compartment, realizing the adjustment of the heat pump type thermal management of the passenger compartment, having an excellent heating effect on the passenger compartment, and realizing air source heat pump heating of the passenger compartment, maximizing the energy-saving effect of the air source heat pump;

[0027] 8. The second refrigeration circuit of the present application can realize heat pump dehumidification of the passenger compartment. With the use of the evaporator, a good dehumidification effect can be obtained. By controlling the valve structure, the switching of different modes can be realized, and the control operation is simple;

[0028] 9. The third refrigeration circuit of the present application is coupled with the coolant circuit through a plate heat exchanger, and the heat energy of the coolant circuit can be recovered through the plate heat exchanger to realize water source heat pump heating of the passenger compartment, recover heat energy to the greatest extent, save energy, and realize the heat pump type thermal management mode provided by the electric drive assembly and the battery pack;

[0029] 10. The present application sets a fourth refrigeration circuit on the refrigerant circuit. The fourth refrigeration circuit includes two refrigeration branches, which can realize battery pack refrigeration and passenger compartment refrigeration respectively. The refrigeration is carried out by dissipating heat outwards through an outdoor heat exchanger, with high refrigeration efficiency and simple control.

[0030] 11. The present application provides a liquid storage pot on the third cooling circuit, which can facilitate the filling of liquid in the cooling liquid circuit and is easy to operate;

[0031] 12. The present application sets a cooling fan on the side opposite to the radiator, thereby increasing the efficiency of the outdoor heat exchanger and the external heat dissipation.

[0032] The direct heat pump type thermal management system of the present application has a simple structure. When the outside temperature is low, it can achieve heat pump heating by adopting a heat pump method in which the refrigerant releases heat in the indoor condenser and absorbs heat in the outdoor heat exchanger, thereby maximizing the energy-saving effect of the air source heat pump. It can realize the cooling and waste heat recovery mode of the motor and electronic control, the battery pack cooling, heating, and temperature equalization mode, and the passenger compartment cooling, dehumidification, air source heat pump heating, and water source heat pump heating modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 : Schematic diagram of the structure of the direct heat pump type thermal management system of the present application (with water heater);

[0034] Figure 2 : Schematic diagram of the structure of the direct heat pump type thermal management system of the present application (waterless heater);

[0035] 1—compressor; 2—plate heat exchanger; 3—seven-way valve; 4—first electronic water pump; 5—second electronic water pump; 6—first electronic expansion valve; 7—second electronic expansion valve; 8—third electronic expansion valve; 9—first solenoid valve; 10—second solenoid valve; 11—check valve; 12—radiator; 13—outdoor heat exchanger; 14—cooling fan; 15—blower; 16—evaporator; 17—cabin heat exchanger; 18—gas-liquid separator; 19—battery pack; 20—two-in-one module; 21—electric drive assembly; 22—liquid storage pot; 23—water heater; 100—refrigerant circuit; 200—coolant circuit. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The present application relates to a direct heat pump type thermal management system, which includes a coolant circuit for thermal management of an electric drive assembly and a battery pack and a refrigerant circuit for thermal management of a passenger compartment, wherein the refrigerant circuit is a heat pump type piping structure, and the coolant circuit is connected via a seven-way valve, which can cooperate with the refrigerant circuit to realize motor electronic control cooling and waste heat recovery modes, battery pack cooling, heating, and temperature equalization modes, and passenger compartment cooling, dehumidification, air source heat pump heating, and water source heat pump heating modes. The control method is simple. When the outside temperature is low, it can achieve heat pump heating by using a heat pump method in which the refrigerant releases heat in the indoor condenser and absorbs heat in the outdoor heat exchanger, thereby maximizing the energy-saving effect of the air source heat pump. Under low to extremely low outside temperature conditions, the heating can be gradually transitioned from the air source heat pump to the water source heat pump by heating the electric drive assembly or adjusting the heater from an auxiliary heat source to a main heat source. By switching the coolant circuit using a seven-way valve, the cooling and waste heat recovery modes of the motor electronic control and the battery pack cooling, heating, and temperature equalization modes can be realized. By controlling each refrigerant valve body, the cooling, dehumidification, air source heat pump heating, and water source heat pump heating modes of the passenger compartment can be realized. The entire thermal management system has the advantages of extremely small heat loss, large heating heat exchange, and obvious heating COP advantage.

[0041] Specifically, Figures 1-2 As shown, a direct heat pump type thermal management system of the present application includes a coolant circuit 200 and a refrigerant circuit 100. The coolant circuit 200 is used to perform thermal management on the electric drive assembly 21 and the battery pack 19. The coolant circuit 200 includes a first cooling circuit for thermal management of the battery pack 19, a second cooling circuit provided with a plate heat exchanger 2, a third cooling circuit for thermal management of the electric drive assembly 21, and a fourth cooling circuit equipped with a radiator 12. The first cooling circuit, the second cooling circuit, the third cooling circuit and the fourth cooling circuit are connected via a seven-way valve 3.

[0042] The first cooling circuit is a circuit directly associated with the battery pack 19, and is used to control the coolant flowing through the battery pack 19; the second cooling circuit is a circuit in which the coolant circuit is coupled with the refrigerant circuit, and the second cooling circuit exchanges heat with the refrigerant circuit through the plate heat exchanger 2, and the coolant in the second cooling circuit can exchange heat with the refrigerant in the refrigerant circuit in the plate heat exchanger 2; the third cooling circuit is a circuit associated with the electric drive assembly 21, and is used to control the coolant flowing through the electric drive assembly 21; the fourth cooling circuit is equipped with a radiator 12, which is used to air-cool the electric drive assembly 21 and the battery pack 19. By setting a seven-way valve 3 in the coolant circuit, the seven-way valve 3 can control the on-off between the above-mentioned first cooling circuit, the second cooling circuit, the third cooling circuit and the fourth cooling circuit to achieve different functional modes.

[0043] The refrigerant circuit 100 is a heat pump type piping structure having a gas-liquid separator 18 and a compressor 1. The refrigerant circuit 100 includes a first refrigeration circuit for thermal management of the passenger compartment, a second refrigeration circuit having an evaporator 16 and an in-cabin heat exchanger 17, a third refrigeration circuit connected to the plate heat exchanger 2, and a fourth refrigeration circuit having an outdoor heat exchanger 13.

[0044] The refrigerant circuit 100 is a heat pump type piping structure, which drives the refrigerant in the pipeline through the compressor 1 to realize the heat pump type thermal management mode of the entire piping system. Among them, the first refrigeration circuit, the second refrigeration circuit, the third refrigeration circuit and the fourth refrigeration circuit involve different modes of thermal management of the passenger compartment and the battery pack, and different functional effects can be achieved by controlling the valve structures on different refrigeration circuits. The third refrigeration circuit and the fourth refrigeration circuit can be coupled to each other through the plate heat exchanger 2 and the coolant circuit, and heat exchange can be generated between the plate heat exchanger 2 and the coolant circuit to achieve the effect of heat pump type thermal management of the electric drive assembly and the battery pack.

[0045] In some embodiments of the present application, the present embodiment optimizes the above-mentioned coolant circuit 200, specifically, as follows: Figures 1-2 As shown, the first cooling circuit of this embodiment includes a second electronic water pump 5 and a battery pack 19 connected in series through a pipeline, and the two ends of the first cooling circuit are respectively connected to the sixth valve port and the seventh valve port of the seven-way valve 3. The second electronic water pump 5 drives the coolant in the first cooling circuit to flow, and the flowing coolant passes through the battery pack 19, and can exchange heat with the battery pack 19, so as to achieve the purpose of thermal management of the battery pack 19.

[0046] like Figures 1-2 As shown, the second cooling circuit includes a plate heat exchanger 2 connected in series through a pipeline or a water heater 23 and a plate heat exchanger 2 connected in series through a pipeline, and the two ends of the second cooling circuit are respectively connected to the fourth valve port and the fifth valve port of the seven-way valve 3. The water heater 23 (such as Figure 1 As shown), the water heater 23 may not be provided (as shown Figure 2 As shown, the second cooling circuit with a water heater 23 has a self-heating function, that is, the coolant in the second cooling circuit can be heated by the water heater 23, and the second cooling circuit without a water heater 23 has an electric drive self-heating function, that is, the coolant in the second coolant circuit can be heated by the electric drive self-heating. The heated coolant can heat the battery pack 19 through the coolant circuit, and can also exchange heat with the refrigerant circuit 100 through the plate heat exchanger 2 to achieve heat dissipation of the electric drive assembly 21 and the battery pack 19.

[0047] The third cooling circuit includes a first electronic water pump 4, a two-in-one module 20 and an electric drive assembly 21 which are sequentially connected in series through a pipeline, and the two ends of the third cooling circuit are respectively connected to the first valve port and the second valve port of the seven-way valve 3. The third cooling circuit corresponds to the electric drive assembly 21, and the first electronic water pump 4 of the third cooling circuit drives the coolant to flow in the third cooling circuit, and the coolant flows through the electric drive assembly 21 to achieve heat exchange with the electric drive assembly 21.

[0048] The fourth cooling circuit includes a first electronic water pump 4, a two-in-one module 20, an electric drive assembly 21 and a radiator 12 which are connected in series in sequence through pipelines, and the two ends of the fourth cooling circuit are respectively connected to the first valve port and the third valve port of the seven-way valve 3. The fourth cooling circuit is another circuit structure connected to the electric drive assembly 21. The fourth cooling circuit is provided with a radiator 12. When the electric drive assembly 21 needs to dissipate heat, the fourth cooling circuit can be connected by opening the valve port on the corresponding seven-way valve 3. When the coolant flows through the radiator 12, the coolant can be cooled by external air cooling. The cooled coolant flows through the electric drive assembly 21 to achieve the effect of heat dissipation. Similarly, the heat dissipation requirements of the battery pack 19 can be achieved by controlling the opening and closing of the valve port on the seven-way valve 3.

[0049] The seven-way valve 3 of this embodiment is a valve structure with seven valve ports. Figures 1-2 As shown, the seven-way valve 3 of the present embodiment has four working modes. The seven-way valve 3 has a first working mode in which the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a second working mode in which the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a third working mode in which the first valve port is connected to the fifth valve port, the second valve port is connected to the fourth valve port, the sixth valve port is connected to the seventh valve port, and the third valve port is closed; and a fourth working mode in which the first valve port is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0050] Different working modes correspond to different circuit structures. In the first working mode, the first cooling circuit and the second cooling circuit are connected in series as one, and the first cooling circuit and the second cooling circuit form a large circuit that sequentially connects the second electronic water pump 5, the battery pack 19 and the plate heat exchanger 2 (or the water heater 23). The third cooling circuit is in a closed state, and the fourth cooling circuit is in an open state. The fourth cooling circuit is isolated from the first cooling circuit and the second cooling circuit, and the flow of coolant between them is independent; in the second working mode, the first cooling circuit is in an open state, the second cooling circuit is in an open state, the fourth cooling circuit is in an open state, and the third cooling circuit is in a closed state. The first cooling circuit, the second cooling circuit and the third cooling circuit are isolated from each other, and the flow of coolant between them is independent, without interfering with each other, and there is no heat exchange between them; the third working mode is the second cooling circuit and the third The cooling circuits are connected to form a large circuit, which is connected in series with the first electronic water pump 4, the two-in-one module 20, the electric drive assembly 21 and the plate heat exchanger 2 in sequence. The electric drive assembly 21 can exchange heat with the refrigerant circuit through the plate heat exchanger 2. The fourth cooling circuit is in a closed state, and the first cooling circuit is in an open state. The large circuit formed by the first cooling circuit and the second cooling circuit and the third cooling circuit is independent, and the flows of the coolant are isolated from each other; the fourth working mode is that the fourth cooling circuit is in a closed state, and the first cooling circuit, the second cooling circuit and the third cooling circuit are connected in series to form a large circuit. The large circuit is connected in series with the second electronic water pump 5, the battery pack 19, the first electronic water pump 4, the two-in-one module 20, the electric drive assembly 21 and the plate heat exchanger 2 (or there is also a water heater 23). In this mode, the electric drive assembly 21 and the battery pack 19 can exchange heat with the refrigerant circuit through the plate heat exchanger 2.

[0051] In other embodiments of the present application, the above-mentioned refrigerant circuit is optimized in this embodiment. The refrigerant circuit of this embodiment includes four refrigeration circuits, such as Figures 1-2 As shown, the first refrigeration circuit includes a compressor 1, an in-cabin heat exchanger 17, a first electronic expansion valve 6, an outdoor heat exchanger 13, a one-way valve 11, a second solenoid valve 10 and a gas-liquid separator 18 which are connected in series through pipelines to form a circuit.

[0052] The second refrigeration circuit includes a compressor 1, an in-cabin heat exchanger 17, a first solenoid valve 9, a second electronic expansion valve 7, an evaporator 16 and a gas-liquid separator 18 which are sequentially connected in series through pipelines to form a circuit.

[0053] The third refrigeration circuit includes a compressor 1, an in-cabin heat exchanger 17, a first solenoid valve 9, a third electronic expansion valve 8, a plate heat exchanger 2 and a gas-liquid separator 18 which are sequentially connected in series through pipelines to form a circuit.

[0054] The fourth refrigeration circuit includes a first refrigeration branch in which a second electronic expansion valve 7, an evaporator 16 and a gas-liquid separator 18 are connected in series in sequence through a pipeline, and a second refrigeration branch in which a third electronic expansion valve 8, a plate heat exchanger 2 and a gas-liquid separator 18 are connected in series in sequence through a pipeline. The first refrigeration branch and the second refrigeration branch are connected in parallel to each other. The fourth refrigeration circuit is connected in series in sequence through a pipeline with a compressor 1, an indoor heat exchanger 17, a first electronic expansion valve 6, an outdoor heat exchanger 13, a one-way valve 11, a first refrigeration branch and / or a second refrigeration branch. The outdoor heat exchanger 13 is located on one side of the radiator 12 on the fourth cooling circuit.

[0055] Each refrigeration circuit corresponds to a different control strategy, which can achieve different thermal management effects. When the first electronic expansion valve 6 (throttling) and the second solenoid valve 10 are in the open state, the second electronic expansion valve 7, the third electronic expansion valve 8 and the first solenoid valve 9 are in the closed state, that is, the first refrigeration circuit is in the open state, and the second refrigeration circuit, the third refrigeration circuit and the fourth refrigeration circuit are all in the closed state, under the driving action of the compressor 1, the refrigerant in the refrigeration circuit passes through the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13, the one-way valve, the second solenoid valve 10 in turn, and then flows back to the gas-liquid separator 18; when the first electronic expansion valve 6, the second solenoid valve 10 and the third electronic expansion valve 8 are in the closed state, the first electronic expansion valve 6, the second solenoid valve 10 and the third electronic expansion valve 8 are in the closed state. When the magnetic valve 9 and the second electronic expansion valve 7 are in the open state, that is, the second refrigeration circuit is in the open state, and the first refrigeration circuit, the third refrigeration circuit and the fourth refrigeration circuit are all in the closed state, under the driving action of the compressor 1, the refrigerant in the refrigeration circuit passes through the cabin heat exchanger 17, the first electromagnetic valve 9, the second electronic expansion valve 7 and the evaporator 16 in sequence, and then flows back to the gas-liquid separator 18; when the first electronic expansion valve 6, the second electronic expansion valve 7 and the second electromagnetic valve 10 are in the closed state, the third electronic expansion valve 8 and the first electromagnetic valve 9 are in the open state, that is, the third refrigeration circuit is in the open state, the first refrigeration circuit, the second refrigeration circuit and When the fourth refrigeration circuit is in a closed state, under the driving action of the compressor 1, the refrigerant in the refrigeration circuit passes through the cabin heat exchanger 17, the first solenoid valve 9, the third electronic expansion valve 8 and the plate heat exchanger 2 in sequence, and then flows back to the gas-liquid separator 18; when the first electronic expansion valve 6, the second electronic expansion valve 7 and the third electronic expansion valve 8 are in an open state, the first solenoid valve 9 and the second solenoid valve 10 are in an open-closed state, that is, the fourth refrigeration circuit is in an open state, and the first refrigeration circuit, the second refrigeration circuit and the third refrigeration circuit are all in a closed state, under the driving action of the compressor 1, the refrigerant in the refrigeration circuit passes through the cabin heat exchanger 17, the first solenoid valve 9, the third electronic expansion valve 8 and the plate heat exchanger 2 in sequence. 17. The first electronic expansion valve 6, the outdoor heat exchanger 13, and the one-way valve 11 are divided into two. One way can be opened by opening the second electronic expansion valve 7 to open the first refrigeration branch. The refrigerant flowing out of the one-way valve 11 passes through the second electronic expansion valve 7 and enters the evaporator 16 and then flows back to the gas-liquid separator 18. The other way can be opened by opening the third electronic expansion valve 8 to open the second refrigeration branch. The refrigerant flowing out of the one-way valve 11 passes through the third electronic expansion valve 8 and the plate heat exchanger 2 and finally flows back to the gas-liquid separator 18. The second electronic expansion valve 7 and the third electronic expansion valve 8 can be used to control the on and off of different refrigeration branches to achieve different refrigeration effects.

[0056] The first refrigeration branch and the second refrigeration branch are parallel pipe structures. The appropriate control method can be selected according to the cooling requirements of the battery pack and the passenger compartment. The passenger compartment or the battery pack can be cooled separately, or the first refrigeration branch and the second refrigeration branch can be opened at the same time to cool the passenger compartment and the battery pack at the same time.

[0057] In addition, a liquid reservoir 22 is provided on the fourth cooling circuit between the electric drive assembly 21 and the radiator 12 in this embodiment. The liquid reservoir 22 is a structure for adding coolant to the coolant circuit, which is convenient for adding coolant through the liquid reservoir 22 when the coolant in the coolant circuit is missing. Furthermore, a cooling fan 14 is also included, and the cooling fan 14 is located on the side of the outdoor heat exchanger 13 relative to the radiator 12. The cooling fan 14 can increase the heat dissipation effect of the outdoor heat exchanger 13.

[0058] The direct heat pump thermal management system of the present application involves multiple modes when actually used, including:

[0059] 1. Dual cooling mode for battery pack and passenger compartment

[0060] This is generally a high-temperature situation in summer, when the outside temperature is high, and the battery pack and the passenger compartment need to be cooled simultaneously, mainly for driving, parking, and charging.

[0061] The seven-way valve 3 is in the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (full-through), the second electronic expansion valve 7 (throttling) and the third electronic expansion valve 8 (throttling) are in the open state, the first solenoid valve 9 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0062] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13 and the one-way valve 11 in sequence, and then is divided into two parts, one part flows back to the gas-liquid separator 18 through the second electronic expansion valve 7 and the evaporator 16, and the other part flows back to the gas-liquid separator 1 through the third electronic expansion valve 8 and the plate heat exchanger 2, completing the circulation of the refrigerant circuit;

[0063] Under the action of the second electronic water pump 5, the coolant in the first cooling circuit passes through the second electronic water pump 5 and the battery pack 19 in sequence, flows out from the seventh valve port of the seven-way valve 3, enters the fourth valve port of the seven-way valve 3, and then enters the second cooling circuit, passes through the water heater 23 (not started) and the plate heat exchanger 2 in sequence, flows out from the fifth valve port of the seven-way valve 3, and finally enters the first cooling circuit through the sixth valve port of the seven-way valve 3, completing the circulation of the coolant circuit;

[0064] During this process, the heat of the battery pack 19 is taken away by the coolant flowing through the battery pack 19, and the heated coolant flows through the plate heat exchanger 2, and heat exchange occurs between the coolant in the plate heat exchanger 2 and the refrigerant in the refrigerant circuit. The refrigerant absorbs the heat of the coolant, causing the temperature of the coolant to drop, thereby achieving the effect of heat dissipation and cooling the battery pack 19; the refrigerant flows through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 dissipates heat outward to cool the refrigerant. In addition to the part of the cooled refrigerant that flows through the plate heat exchanger 2, another part of the refrigerant enters the evaporator 16 to generate cooling air, which is blown through the passenger compartment under the action of the blower 15, thereby achieving the effect of cooling the passenger compartment.

[0065] 2. Passenger compartment cooling mode

[0066] This is generally a high-temperature situation in summer, when the outside temperature is high and the passenger compartment needs to be cooled, mainly for driving and parking;

[0067] According to the current situation of the battery pack 19, the seven-way valve 3 has two working modes. If the current battery pack 19 does not have uniform temperature (the battery pack 19 has multiple cells, and there may be a large temperature difference between the cells. If this happens, it is required to adjust the temperature of the cells to reduce the temperature difference for uniform temperature operation), the seven-way valve 3 is adjusted to the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (full pass) and the second electronic expansion valve 7 (throttling) are in the open state, the third electronic expansion valve 8, the first solenoid valve 9 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 is running, the second electronic water pump 5 is stopped, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0068] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13 and the one-way valve 11 in sequence, and then flows back to the gas-liquid separator 18 through the second electronic expansion valve 7 and the evaporator 16, completing the circulation of the refrigerant circuit;

[0069] In this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 dissipates heat to the outside to cool the refrigerant. The cooled refrigerant enters the evaporator 16 to generate cooling air, which is blown to the passenger compartment under the action of the blower 15, thereby achieving the effect of cooling the passenger compartment.

[0070] If the battery pack 19 currently has a need for temperature equalization, the seven-way valve 3 can be maintained in the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (full pass) and the second electronic expansion valve 7 (throttling) are in the open state, the third electronic expansion valve 8, the first solenoid valve 9 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0071] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13 and the one-way valve 11 in sequence, and is then divided into two parts. One part of the refrigerant flows back to the gas-liquid separator 18 through the first refrigeration branch, i.e., the second electronic expansion valve 7 and the evaporator 16, and the other part flows through the second refrigeration branch, i.e., the third electronic expansion valve 8 and the plate heat exchanger 2, completing the circulation of the refrigerant circuit;

[0072] In this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 dissipates heat outward to cool the refrigerant. The cooled refrigerant passes through the second electronic expansion valve 7 and then enters the evaporator 16 to generate refrigerated air. Under the action of the blower 15, the passenger compartment is purged to achieve the effect of cooling the passenger compartment. At the same time, the cooled refrigerant passes through the third electronic expansion valve 8 and then enters the plate heat exchanger 2 to exchange heat with the coolant passing through the plate heat exchanger 2 to achieve the effect of cooling the coolant. The cooled coolant flows through the battery pack 19 to achieve the operation of cooling and equalizing the temperature of the battery pack 19.

[0073] There is another operation mode of temperature equalization, in which the seven-way valve 3 is adjusted to the second working mode, that is, the fourth valve port is connected to the fifth valve port, the seventh valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (full pass) and the second electronic expansion valve 7 (throttling) are in the open state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0074] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13 and the one-way valve 11 in sequence, and then flows back to the gas-liquid separator 18 through the second electronic expansion valve 7 and the evaporator 16, completing the circulation of the refrigerant circuit;

[0075] In this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 dissipates heat to the outside to cool the refrigerant. The cooled refrigerant passes through the second electronic expansion valve 7 and then enters the evaporator 16 to generate refrigerated air. Under the action of the blower 15, the refrigerated air is blown to the passenger compartment to achieve the effect of cooling the passenger compartment.

[0076] Under the action of the second electronic water pump 5, the coolant in the first cooling circuit passes through the second electronic water pump 5 and the battery pack 19 in turn, flows out from the seventh valve port of the seven-way valve 3, and enters the sixth valve port of the seven-way valve 3, completing the circulation flow of the first cooling circuit. Therefore, at this time, it is only necessary to ensure that the temperature of the battery cells in the battery pack 19 is consistent. The required uniform temperature requirement can be achieved through the circulation of the refrigerant, and there is no need to operate by external cooling.

[0077] 3. Battery pack cooling mode

[0078] This is generally a high temperature situation in summer, the external temperature is high, and the battery pack needs to be cooled down, mainly for charging;

[0079] The seven-way valve 3 is adjusted to the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the second electronic expansion valve 7, the first solenoid valve 9 and the second solenoid valve 10 are in the closed state, the first electronic expansion valve 6 (full pass) and the third electronic expansion valve 8 (throttling) are in the open state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the stopped state;

[0080] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13 and the one-way valve 11 in sequence, and then flows back to the gas-liquid separator 18 through the third electronic expansion valve 8 and the plate heat exchanger 2, completing the circulation of the refrigerant circuit;

[0081] In this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 dissipates heat outward to cool the refrigerant. The cooled refrigerant passes through the second electronic expansion valve 7 and then enters the plate heat exchanger 2. The cooled refrigerant in the plate heat exchanger 2 exchanges heat with the coolant in the second cooling circuit, taking away the heat of the coolant in the coolant circuit.

[0082] Under the action of the second electronic water pump 5, the coolant in the first cooling circuit flows out from the seventh valve port of the seven-way valve 3 after passing through the second electronic water pump 5 and the battery pack 19 in sequence, enters the fourth valve port of the seven-way valve 3, and then enters the second cooling circuit, passes through the water heater 23 (stopped) and the plate heat exchanger 2 in sequence, and finally flows out from the fifth valve port of the seven-way valve 3, and enters the first cooling circuit from the sixth valve port of the seven-way valve 3;

[0083] After the coolant flows through the battery pack 19 , it will take away the heat of the battery pack 19 . In the plate heat exchanger 2 , heat exchange will occur with the refrigerant flowing through the plate heat exchanger 2 . The temperature of the coolant will drop and the temperature of the refrigerant will rise, thereby achieving the effect of cooling the battery pack 19 .

[0084] 4. Heating and dehumidification mode of passenger compartment

[0085] At this time, it is generally a medium temperature in spring and autumn, and the passenger compartment needs to be heated and dehumidified, mainly for driving, parking, and charging;

[0086] Because only the passenger compartment is involved, there is no need to adjust the seven-way valve 3. The passenger compartment needs to be heated and dehumidified, so the first solenoid valve 9 (full pass) and the second electronic expansion valve 7 (throttling) are in the open state, the compressor 1 is running, and the blower 15 is in the running state;

[0087] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first solenoid valve 9, the second electronic expansion valve 7 and the evaporator 16 in sequence, and finally flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0088] In this process, the refrigerant driven by the compressor 1 releases heat through the cabin heat exchanger 17, and then enters the evaporator 16 after throttling through the second electronic expansion valve 7, generating dry and warm air, which is blown into the passenger compartment under the action of the blower 15, achieving the effect of heating and dehumidifying the passenger compartment.

[0089] 5. Passenger compartment cooling and dehumidification mode

[0090] At this time, it is generally a medium temperature in spring and autumn, and the passenger compartment needs to be cooled and dehumidified, mainly for driving, parking, and charging;

[0091] Because only the passenger compartment is involved, there is no need to adjust the seven-way valve 3. The passenger compartment needs to be cooled and dehumidified, so the first electronic expansion valve 6 (full pass) and the second electronic expansion valve 7 (throttling) are in the open state, the compressor 1 is running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0092] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the outdoor heat exchanger 13, the check valve 11 and the second electronic expansion valve 7 in sequence, then enters the evaporator 16, and finally flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0093] During this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13. The outdoor heat exchanger 13 absorbs the heat of the refrigerant by dissipating the heat outward. The cooled refrigerant enters the evaporator 16 after being throttled by the second electronic expansion valve 7, and the humidity is reduced. Finally, under the action of the blower 15, low-temperature dry air is blown into the passenger compartment to achieve the effect of cooling and dehumidifying the passenger compartment.

[0094] 6. Air source heat pump mode for passenger compartment heating

[0095] This is usually a low-temperature winter situation, and the passenger compartment needs to be heated, mainly for driving, parking, and charging.

[0096] The seven-way valve 3 is adjusted to the second working mode, that is, the fourth valve port is connected to the fifth valve port, the seventh valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (throttling) and the second solenoid valve 10 are in the open state, the second electronic expansion valve 7, the third electronic expansion valve 8 and the first solenoid valve 9 are in the closed state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0097] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6 and the second solenoid valve 10 in sequence, and then flows back to the gas-liquid separator 18 to complete the circulation of the refrigerant circuit;

[0098] In this process, the refrigerant driven by the compressor 1 passes through the cabin heat exchanger 17, and heat is transferred to the air entering the cabin through the cabin heat exchanger 17, thereby heating the air entering the cabin. Under the action of the blower 15, the passenger cabin is purged to meet the heating requirements of the passenger cabin.

[0099] At this time, the heating of the passenger compartment depends on the outdoor heat exchanger 13 absorbing the external air energy and the compressor 1 doing work, that is, using the external air as a heat source.

[0100] 7. Passenger compartment heating water source heat pump mode

[0101] At this time, it is generally a low-temperature winter situation, and the passenger compartment needs to be heated, mainly for parking and charging;

[0102] The seven-way valve 3 is adjusted to the third working mode, that is, the first valve port is connected to the fifth valve port, the second valve port is connected to the fourth valve port, the sixth valve port is connected to the seventh valve port, and the third valve port is closed; the third electronic expansion valve 8 (throttling) and the first solenoid valve 9 are in the open state, the first electronic expansion valve 6, the second electronic expansion valve 7 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 is running, and the blower 15 is in the running state;

[0103] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first solenoid valve 9, the third electronic expansion valve 8 and the plate heat exchanger 2 in sequence, and then flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0104] In this process, the refrigerant driven by the compressor 1 passes through the cabin heat exchanger 17, and heat is transferred to the air entering the cabin through the cabin heat exchanger 17, so as to heat the air entering the cabin. Under the action of the blower 15, the passenger cabin is purged to meet the heating demand of the passenger cabin. At this time, the heating of the passenger cabin completely relies on the plate heat exchanger 2 to absorb the heat of the coolant circuit, that is, the water source of the coolant circuit is used as the heat source.

[0105] Under the action of the first electronic water pump 4, the coolant flows in the second cooling circuit and the third cooling circuit, passes through the first electronic water pump, the two-in-one module 20 and the electric drive assembly 21 in sequence, and then enters the fourth valve port of the seven-way valve 3 from the second valve port of the seven-way valve 3, and then passes through the water heater 23 and the plate heat exchanger 2. The coolant is heated in the water heater 23 or the electric drive assembly 21, and the temperature rises. Heat is exchanged with the refrigerant in the plate heat exchanger 2, the temperature of the refrigerant rises, and the temperature of the coolant decreases. Finally, the coolant with reduced temperature flows out from the fifth valve port of the seven-way valve 3, and enters the third cooling circuit through the first valve port of the seven-way valve 3, completing the circulation of the coolant;

[0106] In this process, the heat source required for heating the passenger compartment is the coolant circuit, in which Figure 1 Mainly water heater 23, Figure 2 It is mainly caused by the self-heating of the electric drive assembly 21.

[0107] 8. Electric drive assembly waste heat recovery to passenger compartment mode

[0108] This is generally a low-temperature winter situation, the electric drive assembly 21 generates a large amount of heat, and the passenger compartment needs to be heated, mainly for driving;

[0109] The seven-way valve 3 is adjusted to the third working mode, that is, the first valve port is connected to the fifth valve port, the second valve port is connected to the fourth valve port, the sixth valve port is connected to the seventh valve port, and the third valve port is closed; the third electronic expansion valve 8 (throttling) and the first solenoid valve 9 are in the open state, the first electronic expansion valve 6, the second electronic expansion valve 7 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 is running, and the blower 15 is in the running state;

[0110] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first solenoid valve 9, the third electronic expansion valve 8 and the plate heat exchanger 2 in sequence, and then flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0111] In this process, the refrigerant driven by the compressor 1 passes through the cabin heat exchanger 17, and heat is transferred to the air entering the cabin through the cabin heat exchanger 17, so as to heat the air entering the cabin. Under the action of the blower 15, the passenger cabin is purged to meet the heating demand of the passenger cabin. At this time, the heating of the passenger cabin completely relies on the plate heat exchanger 2 to absorb the heat of the coolant circuit, that is, the water source of the coolant circuit is used as the heat source.

[0112] Under the action of the first electronic water pump 4, the coolant flows in the second cooling circuit and the third cooling circuit, passes through the first electronic water pump, the two-in-one module 20 and the electric drive assembly 21 in sequence, and then enters the fourth valve port of the seven-way valve 3 from the second valve port of the seven-way valve 3, and then passes through the water heater 23 and the plate heat exchanger 2. The coolant flowing through the electric drive assembly 21 will take away the heat generated by the electric drive assembly 21, and the coolant temperature rises. Heat is exchanged with the refrigerant in the plate heat exchanger 2, and the refrigerant temperature rises, and the coolant temperature decreases. Finally, the coolant with reduced temperature flows out from the fifth valve port of the seven-way valve 3, and enters the third cooling circuit through the first valve port of the seven-way valve 3, completing the circulation of the coolant;

[0113] The water heater 23 can be in a stopped state or can be turned on as needed, as long as the temperature of the coolant flowing through the electric drive assembly 21 is lower than the temperature of the electric drive assembly 21 and can absorb the waste heat of the electric drive assembly 21.

[0114] 9. Electric drive assembly waste heat recovery to battery pack mode

[0115] At this time, it is generally a low temperature in winter, the electric drive assembly 21 generates a large amount of heat, and the battery pack needs to be heated, mainly for driving and parking states;

[0116] The seven-way valve 3 is adjusted to the fourth working mode, that is, the first valve port is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; because it only involves the coolant circuit and has nothing to do with the refrigerant circuit, there is no need to adjust the valve of the refrigerant circuit; the first electronic water pump 4 and the second electronic water pump 5 are in operation;

[0117] Under the action of the first electronic water pump 4 and the second electronic water pump 5, the coolant flows in the first cooling circuit, the second cooling circuit and the third cooling circuit, passes through the second electronic water pump 5 and the battery pack 19 in sequence, then enters the first valve port of the seven-way valve 3 from the seventh valve port of the seven-way valve 3, passes through the first electronic water pump 4, the two-in-one module 20 and the electric drive assembly 21, then enters the fourth valve port of the seven-way valve 3 from the second valve port of the seven-way valve 3, and then passes through the water heater 23 and the plate heat exchanger 2. The coolant flowing through the electric drive assembly 21 will take away the heat generated by the electric drive assembly 21, and the temperature of the coolant will rise. The heated coolant will enter the sixth valve port of the seven-way valve 3 from the fifth valve port of the seven-way valve 3, and flow back to the first cooling circuit, completing the circulation of the coolant;

[0118] The water heater 23 can be in a stopped state or can be turned on as needed, as long as the temperature of the coolant flowing through the electric drive assembly 21 is lower than the temperature of the electric drive assembly 21 and can absorb the waste heat of the electric drive assembly 21.

[0119] 10. Battery pack heating mode

[0120] This is generally a low-temperature winter situation, and the battery pack needs to be heated, mainly for charging;

[0121] The seven-way valve 3 is adjusted to the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; because it only involves the coolant circuit and has nothing to do with the refrigerant circuit, there is no need to adjust the valve of the refrigerant circuit; the second electronic water pump 5 is running;

[0122] Under the action of the second electronic water pump 5, the coolant flows in the first cooling circuit and the second cooling circuit, passes through the second electronic water pump 5 and the battery pack 19 in sequence, and then enters the fourth valve port of the seven-way valve 3 from the seventh valve port of the seven-way valve 3, passes through the water heater 23 and the plate heat exchanger 2, and the coolant is heated in the water heater 23. The heated coolant enters the sixth valve port of the seven-way valve 3 from the fifth valve port of the seven-way valve 3, and flows back to the first cooling circuit, completing the circulation of the coolant;

[0123] The water heater 23 heats the coolant, and the heated coolant heats the battery pack 29. The heating method is very simple.

[0124] 11. Air source heat pump for passenger compartment heating and battery pack heating mode

[0125] This is usually a low-temperature winter situation, and the passenger compartment and battery pack need to be heated, mainly for driving, parking, and charging.

[0126] The seven-way valve 3 is adjusted to the first working mode, that is, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; the first electronic expansion valve 6 (throttling) and the second solenoid valve 10 are in the open state, the second electronic expansion valve 7, the third electronic expansion valve 8 and the first solenoid valve 9 are in the closed state, the compressor 1 is running, the second electronic water pump 5 is running, the outdoor heat exchanger 13 is in the heat exchange state, and the blower 15 is in the running state;

[0127] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first electronic expansion valve 6, the check valve 11 and the second solenoid valve 10 in sequence, and then flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0128] In this process, the refrigerant driven by the compressor 1 passes through the outdoor heat exchanger 13, and the outdoor heat exchanger 13 absorbs the heat of the external air to heat the refrigerant. The heated refrigerant enters the cabin heat exchanger 17 after the compressor 1 does work, and the blower 16 blows warm air into the passenger cabin. At this time, the heat source for heating the passenger cabin is the external gas heat source.

[0129] Under the action of the second electronic water pump 5, the coolant in the first cooling circuit flows out from the seventh valve port of the seven-way valve 3 after passing through the second electronic water pump 5 and the battery pack 19 in sequence, enters the fourth valve port of the seven-way valve 3, and then enters the second cooling circuit, passes through the water heater 23 and the plate heat exchanger 2 in sequence, and finally flows out from the fifth valve port of the seven-way valve 3, and enters the first cooling circuit from the seventh valve port of the seven-way valve 3;

[0130] After the coolant flows through the water heater 23 , the water heater 23 will heat the coolant to raise its temperature. The heated coolant passes through the battery pack 19 , which will heat the battery pack 19 , thereby achieving the purpose of heating the battery pack 19 .

[0131] 12. Passenger compartment heating water source heat pump and battery pack heating mode

[0132] This is usually a low-temperature winter situation, and the passenger compartment and battery pack need to be heated, mainly for driving, parking, and charging.

[0133] The seven-way valve 3 is adjusted to the fourth working mode, that is, the first valve port is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; the third electronic expansion valve 8 (throttling) and the first solenoid valve 9 are in the open state, the first electronic expansion valve 6, the second electronic expansion valve 7 and the second solenoid valve 10 are in the closed state, the compressor 1 is running, the first electronic water pump 4 and the second electronic water pump 5 are running, and the blower 15 is in the running state;

[0134] Under the action of the compressor 1, the refrigerant flows in the refrigeration circuit, passes through the compressor 1, the cabin heat exchanger 17, the first solenoid valve 9, the third electronic expansion valve 8 and the plate heat exchanger 2 in sequence, and then flows back to the gas-liquid separator 18, completing the circulation of the refrigerant circuit;

[0135] In this process, the refrigerant driven by the compressor 1 passes through the cabin heat exchanger 17, and heat is transferred to the air entering the cabin through the cabin heat exchanger 17, so as to heat the air entering the cabin. Under the action of the blower 15, the passenger cabin is purged to meet the heating demand of the passenger cabin. At this time, the heating of the passenger cabin completely relies on the plate heat exchanger 2 to absorb the heat of the coolant circuit, that is, the water source of the coolant circuit is used as the heat source.

[0136] Under the action of the first electronic water pump 4 and the second electronic water pump 5, the coolant flows in the first cooling circuit, the second cooling circuit and the third cooling circuit, passes through the second electronic water pump 5 and the battery pack 19 in sequence, then enters the first valve port of the seven-way valve 3 from the seventh valve port of the seven-way valve 3, passes through the first electronic water pump 4, the two-in-one module 20 and the electric drive assembly 21, then enters the fourth valve port of the seven-way valve 3 from the second valve port of the seven-way valve 3, and then passes through the water heater 23 and the plate heat exchanger 2. The coolant flowing through the water heater 23 will be heated by the water heater 23, and the temperature of the coolant will increase. The heated coolant will enter the sixth valve port of the seven-way valve 3 from the fifth valve port of the seven-way valve 3, and flow back to the first cooling circuit, completing the circulation of the coolant;

[0137] After the heated coolant passes through the battery pack 19 , the temperature of the battery pack 19 will be increased, thereby achieving the purpose of heating the battery pack 19 .

[0138] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A direct heat pump type thermal management system, Features: include, A coolant circuit (200), the coolant circuit (200) being used for thermal management of an electric drive assembly (21) and a battery pack (19), the coolant circuit (200) comprising a first cooling circuit for thermal management of the battery pack (19), a second cooling circuit provided with a plate heat exchanger (2), a third cooling circuit for thermal management of the electric drive assembly (21), and a fourth cooling circuit provided with a radiator (12); the first cooling circuit, the second cooling circuit, the third cooling circuit, and the fourth cooling circuit being connected via a seven-way valve (3); A refrigerant circuit (100) is a heat pump type piping structure having a gas-liquid separator (18) and a compressor (1), the refrigerant circuit (100) comprising a first refrigeration circuit for thermal management of a passenger compartment, a second refrigeration circuit having an evaporator (16) and an in-cabin heat exchanger (17), a third refrigeration circuit connected to a plate heat exchanger (2), and a fourth refrigeration circuit having an outdoor heat exchanger (13).

2. A direct heat pump type thermal management system as claimed in claim 1, Features: The first cooling circuit comprises a second electronic water pump (5) and a battery pack (19) which are connected in series in sequence through a pipeline; the two ends of the first cooling circuit are respectively connected to the sixth valve port and the seventh valve port of the seven-way valve (3).

3. A direct heat pump type thermal management system as claimed in claim 2, Features: The second cooling circuit comprises a plate heat exchanger (2) connected in series via a pipeline or a water heater (23) and a plate heat exchanger (2) connected in series via a pipeline; the two ends of the second cooling circuit are respectively connected to the fourth valve port and the fifth valve port of the seven-way valve (3).

4. A direct heat pump type thermal management system as claimed in claim 3, Features: The third cooling circuit comprises a first electronic water pump (4), a two-in-one module (20) and an electric drive assembly (21) which are sequentially connected in series through a pipeline; the two ends of the third cooling circuit are respectively connected to the first valve port and the second valve port of the seven-way valve (3).

5. A direct heat pump type thermal management system as claimed in claim 4, Features: The fourth cooling circuit comprises a first electronic water pump (4), a two-in-one module (20), an electric drive assembly (21) and a radiator (12) which are sequentially connected in series through pipelines; the two ends of the fourth cooling circuit are respectively connected to the first valve port and the third valve port of the seven-way valve (3).

6. A direct heat pump type thermal management system as claimed in claim 5, Features: The seven-way valve (3) has a first working mode in which the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a second working mode in which the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, the first valve port is connected to the third valve port, and the second valve port is closed; a third working mode in which the first valve port is connected to the fifth valve port, the second valve port is connected to the fourth valve port, the sixth valve port is connected to the seventh valve port, and the third valve port is closed; and a fourth working mode in which the first valve port is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

7. A direct heat pump type thermal management system as claimed in claim 1, Features: The first refrigeration circuit comprises a compressor (1), an in-cabin heat exchanger (17), a first electronic expansion valve (6), an outdoor heat exchanger (13), a one-way valve (11), a second solenoid valve (10) and a gas-liquid separator (18) which are sequentially connected in series through pipelines to form a circuit.

8. A direct heat pump type thermal management system as claimed in claim 7, Features: The second refrigeration circuit comprises a compressor (1), an in-cabin heat exchanger (17), a first solenoid valve (9), a second electronic expansion valve (7), an evaporator (16) and a gas-liquid separator (18) which are sequentially connected in series through pipelines to form a circuit.

9. A direct heat pump type thermal management system as claimed in claim 8, Features: The third refrigeration circuit comprises a compressor (1), an in-cabin heat exchanger (17), a first solenoid valve (9), a third electronic expansion valve (8), a plate heat exchanger (2) and a gas-liquid separator (18) which are sequentially connected in series through pipelines to form a circuit.

10. A direct heat pump type thermal management system as claimed in claim 9, Features: The fourth refrigeration circuit comprises a first refrigeration branch connected in series via a pipeline with a second electronic expansion valve (7), an evaporator (16) and a gas-liquid separator (18), and a second refrigeration branch connected in series via a pipeline with a third electronic expansion valve (8), a plate heat exchanger (2) and a gas-liquid separator (18); the first refrigeration branch and the second refrigeration branch are connected in parallel with each other; the fourth refrigeration circuit is connected in series via a pipeline with a compressor (1), an in-cabin heat exchanger (17), a first electronic expansion valve (6), an outdoor heat exchanger (13), a one-way valve (11), a first refrigeration branch and / or a second refrigeration branch; the outdoor heat exchanger (13) is located on one side of the radiator (12) on the fourth cooling circuit.

Images