Indirect heat pump type thermal management system

Abstract

The invention relates to the technical field of electric vehicle heat management, in particular to an indirect heat pump type heat management system. Comprising an electric drive cooling liquid loop, a battery cooling liquid loop, a heating cooling liquid loop and a refrigerant loop. The heating cooling liquid loop comprises a first heating loop and a second heating loop; the first heating loop is connected in series with a warm air core body; the second heating loop exchanges heat with the battery cooling liquid loop through the battery heating heat exchanger; the refrigerant loop comprises a first refrigerating loop, a second refrigerating loop and a third refrigerating loop; the first refrigerating loop exchanges heat with the heating coolant loop through the water-cooled condenser; the second refrigerating loop exchanges heat with the battery cooling liquid loop through the battery cooling heat exchanger; an evaporator used for cooling the passenger compartment is connected to the third refrigeration loop in series. And the battery cooling liquid loop and the electric drive cooling liquid loop are mutually coupled and communicated. The indirect heat pump type heat management system can well meet the heating requirements of a battery pack and a passenger compartment.

Description

Technical Field

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

[0002] Since electric vehicles do not have hot water from the engine as a heat source for heating the passenger compartment, a new heat source needs to be found for heating the passenger compartment. Traditional electric vehicles usually use technical solutions similar to PTC (positive temperature coefficient thermistor) water heaters, but due to the principle of converting electrical energy into heat pumps, the energy efficiency ratio of PTC during heating is less than 1, which will cause a large amount of electricity consumption during winter heating, thereby affecting the range of electric vehicles.

[0003] At present, most electric vehicles use air PTC or water PTC resistance wire heating solutions, and the energy source for passenger compartment heating and battery preheating all comes from the power battery. Conventional electric vehicle thermal management solutions have the following disadvantages: 1) When using the PTC technical solution for heating, the energy consumption of the entire vehicle is high and the heat in the environment cannot be used; 2) When defogging the interior of the car in spring and autumn, the air in the car needs to be cooled and dehumidified first, and then the dry air is heated to a comfortable temperature through PTC and provided to the passenger compartment. This will cause the two high-voltage electrical devices, the compressor and the PTC heater, to work at the same time, increasing the high-voltage load power of the entire vehicle and the energy consumption of the entire vehicle.

[0004] At present, some vehicles on the market also adopt the principle of heat pumps. For example, the Chinese invention patent application with patent number "CN113400890A" and titled "A Heat Pump Thermal Management System for Electric Vehicles" proposes a heat pump thermal management system for electric vehicles, including a refrigerant circuit, a warm air coolant circuit, a battery coolant circuit, and a motor coolant circuit. The system adopts an optimized indirect heat pump system solution, and integrates the cooling, heating and defogger requirements of the passenger compartment, the heat dissipation requirements of the motor and the heating and cooling requirements of the power battery through a complete architecture solution. It makes full use of the air source and the motor waste heat recovery for heating the passenger compartment and the battery, reduces the energy consumption of thermal management, and provides winter range for electric vehicles; the energy transfer of the air-conditioning system is realized through the coolant system, and the refrigerant circuit adopts a liquid storage tank system. There is no reverse cycle in the refrigeration circuit, and the original fuel vehicle air-conditioning box structure is not changed. It can be more conveniently installed and applied on multiple oil-electric coexisting vehicle platforms.

[0005] However, there are some problems with this system. Although the system can distribute the heating capacity of the passenger compartment and the battery pack to a certain extent, the water inlet temperature requirement for the heating core when heating the passenger compartment is greater than the water inlet temperature requirement for the battery pack, so the system cannot meet the respective water inlet temperature requirements at the same time. In addition, when the system is cooling, the compressor exhaust releases heat to the outside air through the water-cooled condenser → radiator method, rather than directly exchanging heat with the outside air through the condenser, adding a temperature step, resulting in limited heat exchange between the compressor exhaust and the outside air, which indirectly affects the cooling capacity of the air conditioning system.

[0006] It can be seen that the existing heat pump thermal management systems for electric vehicles generally have the following problems: the coupling of the heating of the battery pack and the passenger compartment cannot simultaneously meet and distribute the heating needs of the battery pack and the passenger compartment when the outside temperature changes from low to extremely low; the existing heat pump thermal management systems have a large number of valve body points, which increases the manufacturing cost. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and provide an indirect heat pump type thermal management system.

[0008] The technical solution of the present invention is: an indirect heat pump type thermal management system, characterized in that it includes an electric drive coolant circuit, a battery coolant circuit, a heating coolant circuit and a refrigerant circuit;

[0009] The heating coolant circuit includes a first heating circuit and a second heating circuit that are coupled and connected to each other; a heater core for heating the passenger compartment is connected in series to the first heating circuit; the second heating circuit exchanges heat with the battery coolant circuit through a battery heating heat exchanger;

[0010] The refrigerant circuit is connected in series with a compressor, and the refrigerant circuit includes a first refrigeration circuit, a second refrigeration circuit and a third refrigeration circuit that are coupled and connected to each other; the first refrigeration circuit exchanges heat with the heating coolant circuit through a water-cooled condenser; the second refrigeration circuit exchanges heat with the battery coolant circuit through a battery cooling heat exchanger; the third refrigeration circuit is connected in series with an evaporator for cooling the passenger compartment;

[0011] The battery coolant circuit and the electric drive coolant circuit are coupled and communicated with each other.

[0012] According to an indirect heat pump type thermal management system provided by the present application, the first refrigeration circuit includes a compressor, a water-cooled condenser, a first electronic expansion valve, an outdoor heat exchanger, a heat pump solenoid valve and a gas-liquid separator, which are connected in series in sequence through pipelines to form a small circuit; the outdoor heat exchanger is arranged in parallel with the motor radiator on the electric drive coolant circuit.

[0013] According to an indirect heat pump type thermal management system provided in the present application, the second refrigeration circuit includes a compressor, a water-cooled condenser, a first electronic expansion valve, an outdoor heat exchanger, a third electronic expansion valve, a battery cooling heat exchanger and a gas-liquid separator, which are connected in series in sequence through pipelines to form a small circuit.

[0014] According to an indirect heat pump type thermal management system provided by the present application, the third refrigeration circuit includes a compressor, a water-cooled condenser, a first electronic expansion valve, an outdoor heat exchanger, a second electronic expansion valve, an evaporator and a gas-liquid separator which are connected in series in sequence through pipelines to form a small circuit.

[0015] According to an indirect heat pump type thermal management system provided by the present application, the first heating circuit includes a water-cooled condenser, a water heater, a warm air core and a third electronic water pump which are sequentially connected in series through pipelines to form a small circuit.

[0016] According to an indirect heat pump type thermal management system provided by the present application, the second heating circuit includes a water-cooled condenser, a water heater, a battery heating heat exchanger and a third electronic water pump which are connected in series in sequence through pipelines to form a small circuit; a heating proportional three-way valve is arranged between the first heating circuit and the second heating circuit and are coupled and connected to each other through the heating proportional three-way valve.

[0017] According to an indirect heat pump type thermal management system provided by the present application, the battery coolant circuit and the electric drive coolant circuit are coupled and connected to each other through an electric drive coolant four-way reversing valve.

[0018] According to an indirect heat pump type thermal management system provided in the present application, the battery coolant circuit includes a battery pack, an electric drive coolant four-way reversing valve, a second electronic water pump, a battery cooling heat exchanger and a battery heating heat exchanger which are sequentially connected in series through pipelines to form a circuit.

[0019] According to an indirect heat pump type thermal management system provided by the present application, the electric drive coolant circuit includes a first electric drive cooling circuit and a second electric drive cooling circuit; the first electric drive cooling circuit includes an electric drive assembly, a motor radiator and a first electronic water pump which are connected in series in sequence through pipes to form a circuit; the second electric drive cooling circuit includes an electric drive assembly and a first electronic water pump which are connected in series in sequence through pipes to form a circuit.

[0020] According to an indirect heat pump type thermal management system provided by the present application, the first electric drive cooling circuit and the second electric drive cooling circuit are coupled and connected to each other through an electric drive coolant proportional three-way valve.

[0021] According to an indirect heat pump type thermal management system provided by the present application, a cooling fan is provided on a side of the motor radiator opposite to the outdoor heat exchanger.

[0022] According to an indirect heat pump type thermal management system provided in the present application, an electric drive coolant auxiliary water tank is provided on the electric drive coolant circuit; and a heating coolant storage pot is provided on the heating coolant circuit.

[0023] The advantages of the present application are as follows: 1. The refrigerant circuit of the present application adopts a heat pump piping structure, which can exchange heat with the battery coolant circuit and the heating coolant circuit, that is, the refrigerant circuit can be used to perform thermal management and regulation on the battery pack and the passenger compartment; when the external temperature drops from relatively low to extremely low, the battery pack and the passenger compartment can also be fully heated by the refrigerant circuit to meet the heating needs of the passenger compartment and the battery pack, so that the battery pack and the passenger compartment can still be in a good temperature environment in a cold environment; moreover, the thermal management system of the present application involves relatively few valve structures, and the manufacturing cost and control difficulty are greatly reduced, which is suitable for large-scale promotion and application;

[0024] 2. The refrigerant circuit of the present application includes a first refrigeration circuit, which is a heat pump pipeline, including a compressor, a water-cooled condenser and other structures, and can perform heat exchange with the heating coolant circuit through the water-cooled condenser. The first refrigeration circuit can realize the working mode of battery pack heating and passenger compartment heating through the above-mentioned pipeline layout mode, and the entire control method is very simple;

[0025] 3. The refrigerant circuit of the present application includes a second refrigeration circuit, and the second refrigeration circuit includes a battery cooling heat exchanger, through which heat exchange can be performed with the battery coolant circuit, that is, the refrigerant circuit and the battery coolant circuit are well connected, so that the thermal management efficiency and effect of the battery pack are greatly improved;

[0026] 4. The present application also includes a third refrigeration circuit, which includes an evaporator. The evaporator cooperates with a gas-liquid separator and a compressor to form a good heat pump pipeline structure, which can form a good heat exchange effect in the heat pipe system of the electric vehicle, achieve thermal management of the battery pack and the passenger compartment, and save energy to the greatest extent;

[0027] 5. The heating coolant circuit of the present application includes a first heating circuit, which corresponds to the heating circuit of the passenger compartment. The coolant flows between the water-cooled condenser and the heater core, which can well meet the heating needs of the passenger compartment. The overall structure is simple and the control and use are extremely convenient.

[0028] 6. The second heating circuit of the present application is a circuit corresponding to the heating demand of the battery pack. The coolant can flow between the battery heating heat exchanger and the water-cooled condenser, which can well meet the heating demand of the battery pack. It has a simple structure, is very convenient to control and use, and the temperature rise and adjustment of the battery pack are rapid;

[0029] 7. The present application couples the battery coolant circuit and the electric drive coolant circuit through the electric drive coolant four-way reversing valve, thereby realizing heat exchange between the electric drive assembly and the battery pack, realizing the function of recovering the waste heat of the electric drive assembly to the battery pack, and realizing the function of recovering the waste heat of the electric drive assembly to the passenger compartment, so that the heat utilization is more comprehensive and energy is saved to the greatest extent;

[0030] 8. The battery coolant circuit structure of the present application is simple, which can well meet the cooling and heating requirements of the battery pack, has excellent thermal management effect on the battery pack, and provides a good temperature environment for the use of the battery pack;

[0031] 9. The electric drive coolant circuit of the present application includes a first electric drive cooling circuit and a second electric drive cooling circuit. Different electric drive cooling circuits correspond to different working modes, which can meet different thermal management requirements of the electric drive assembly, and have a simple structure and are easy to control and use;

[0032] 10. The present application sets an electric drive coolant proportional three-way valve between the first electric drive cooling circuit and the second electric drive cooling circuit. By controlling the electric drive coolant proportional three-way valve, multiple working modes can be realized. The electric drive coolant proportional three-way valve can be controlled to meet different requirements for thermal management of the electric drive assembly. The operation is simple and the thermal management effect is excellent.

[0033] 11. The present application sets a cooling fan on one side of the motor radiator to facilitate the heat dissipation of the motor radiator, making the motor temperature control faster, with a simple structure and easy use;

[0034] 12. The present application sets an electric drive coolant auxiliary water tank on the electric drive coolant circuit and sets a heating coolant storage pot on the heating coolant circuit, which can well realize water circuit filling and water circuit exhaust, thereby improving the safety of the entire thermal management system.

[0035] The present application is an indirect heat pump type thermal management system, which can be well compatible with the heating needs of the battery pack and the passenger compartment. In a cold environment, the heat pump pipeline can be used to heat the battery pack and the passenger compartment, and the heating effect is excellent. In addition, the thermal management system of the present application has a simple structure, and the use cost and manufacturing cost are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 : Schematic diagram of the indirect heat pump type thermal management system of the present application;

[0037] Among them: 1-compressor; 2-water heater; 3-heating proportional three-way valve; 4-electric drive coolant proportional three-way valve; 5-electric drive coolant four-way reversing valve; 6-first electronic water pump; 7-second electronic water pump; 8-third electronic water pump; 9-first electronic expansion valve; 10-second electronic expansion valve; 11-third electronic expansion valve; 12-heat pump solenoid valve; 13-cooling fan; 14-blower; 15-evaporator; 16-heating core; 17-outdoor heat exchanger; 18-motor radiator ; 19—water-cooled condenser; 20—battery heating heat exchanger; 21—battery cooling heat exchanger; 22—gas-liquid separator; 23—electric drive and battery pack coolant circuit filling port; 24—electric drive coolant auxiliary water tank; 25—heating coolant storage pot; 26—HVAC heating and cooling air mixing damper; 27—two-in-one module; 28—electric drive assembly; 29—battery pack; 100—refrigerant circuit; 200—electric drive coolant circuit; 300—battery coolant circuit; 400—heating coolant circuit. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] The present application relates to an indirect heat pump type thermal management system. The thermal management system of the present application is used for electric vehicles and can well meet the heating needs of the battery pack and the passenger compartment. Through the heat pump pipeline structure, when the electric vehicle enters from a lower temperature to an extremely low temperature, it can take into account the heating needs of the battery pack and the passenger compartment. The use of a heat pump system can save a lot of winter heating energy consumption, and can also realize multiple functions such as motor waste heat recovery and passenger compartment dehumidification.

[0043] Specifically, Figure 1 As shown, an indirect heat pump type thermal management system of the present application includes an electric drive coolant circuit 200, a battery coolant circuit 300, a heating coolant circuit 400 and a refrigerant circuit 100. The electric drive coolant circuit 200 is a coolant circuit structure for the electric drive assembly, the battery coolant circuit 300 is a coolant circuit structure for the battery pack, the heating coolant circuit 400 is a coolant circuit structure for the passenger compartment, and the refrigerant circuit 100 is a heat pump piping structure.

[0044] Among them, the heating coolant circuit 400 includes a first heating circuit and a second heating circuit that are coupled and connected to each other. The first heating circuit is connected in series with a heater core 16 for heating the passenger compartment, and the second heating circuit exchanges heat with the battery coolant circuit 300 through a battery heating heat exchanger 20. The first heating circuit is a circuit structure corresponding to the passenger compartment, and the second heating circuit is a circuit structure corresponding to the heating demand of the battery pack. When the passenger compartment has a heating demand, the first heating circuit is started, so that the heated coolant in the first heating circuit flows through the heater core 16 of the passenger compartment to heat the heater core 16 to meet the heating demand of the passenger compartment; when the battery pack has a heating demand, the second heating circuit is started, so that the heated coolant in the second heating circuit flows through the battery heating heat exchanger 20 to heat the battery heating heat exchanger, thereby achieving the heating requirement for the battery pack; when both the battery pack and the passenger compartment have heating demands, the first heating circuit and the second heating circuit are started at the same time, so that the heated coolant flows to the battery heating heat exchanger 20 and the heater core 16 respectively, thereby heating the battery pack and the passenger compartment respectively.

[0045] The refrigerant circuit 100 is connected in series with a compressor 1. The refrigerant circuit 100 includes a first refrigeration circuit, a second refrigeration circuit, and a third refrigeration circuit that are coupled and connected to each other. The first refrigeration circuit exchanges heat with the heating coolant circuit 400 through a water-cooled condenser 19, and the second refrigeration circuit exchanges heat with the battery coolant circuit 300 through a battery cooling heat exchanger 21. The third refrigeration circuit is connected in series with an evaporator 15 for cooling the passenger compartment. The first refrigeration circuit directly exchanges heat with the heating coolant circuit 400, that is, the heating coolant circuit 400 can exchange heat with the refrigerant circuit 100 through the water-cooled condenser 19, and the refrigerant circuit 100 can be used for heating the battery pack or / and the passenger compartment.

[0046] The battery coolant circuit 300 and the electric drive coolant circuit 200 are coupled and connected to each other, so that heat exchange can be performed between the battery coolant circuit 300 and the electric drive coolant circuit 200, that is, the waste heat of the electric drive assembly 28 can be collected to heat the battery pack 29, thereby recovering the waste heat of the electric drive assembly 28.

[0047] An indirect heat pump type thermal management system of the present application can realize the operation of multiple modes of the entire electric vehicle, such as battery pack PTC heating mode, passenger compartment PTC heating mode, battery pack and passenger compartment PTC heating mode, battery pack heat pump heating mode, passenger compartment heat pump heating mode, battery pack and passenger compartment heat pump heating mode, electric drive assembly waste heat recovery to battery pack mode, electric drive assembly waste heat recovery to passenger compartment mode, passenger compartment heating and dehumidification mode, passenger compartment cooling and dehumidification mode, electric drive assembly air cooling mode, electric drive assembly and battery pack air cooling mode, battery pack cooling mode, passenger compartment cooling mode, battery pack and passenger compartment cooling mode, water circuit filling mode and water circuit exhaust mode. Switching operations can be performed according to different situations to adapt to different requirements.

[0048] In some embodiments of the present application, the above-mentioned refrigerant circuit 100 is optimized. Specifically, Figure 1 As shown, the first refrigeration circuit of the refrigerant circuit 100 includes a compressor 1, a water-cooled condenser 19, a first electronic expansion valve 9, an outdoor heat exchanger 17, a heat pump solenoid valve 12 and a gas-liquid separator 22, which are connected in series through pipelines to form a small circuit. The outdoor heat exchanger 17 is arranged in parallel with the motor radiator 18 on the electric drive coolant circuit 200.

[0049] That is to say, the refrigerant of the first refrigeration circuit can circulate through the compressor 1, the water-cooled condenser 19, the first electronic expansion valve 9, the outdoor heat exchanger 17, the heat pump solenoid valve 12 and the gas-liquid separator 22 in sequence. When the heat pump solenoid valve 12 is in the open state, the refrigerant can flow in the pipeline driven by the compressor 1, and exchange heat with the coolant flowing through the water-cooled condenser 19 when flowing through the water-cooled condenser 19. Because the water-cooled condenser 19 is a component structure on the heating coolant circuit 400, the first refrigeration circuit is coupled with the heating coolant circuit 400 through the water-cooled condenser 19. The first refrigeration circuit can generate heat exchange with the heating coolant circuit 400, and the heating coolant circuit 400 can be heated through the heat pump type piping structure of the first refrigeration circuit, which is equivalent to heating the battery pack and the passenger compartment.

[0050] In addition, the refrigerant circuit 100 also includes a second refrigeration circuit, which includes a compressor 1, a water-cooled condenser 19, a first electronic expansion valve 9, an outdoor heat exchanger 17, a third electronic expansion valve 11, a battery cooling heat exchanger 21 and a gas-liquid separator 22, which are connected in series through pipelines to form a small circuit. The second refrigeration circuit has the same structure as some components of the first refrigeration circuit, that is, the compressor 1, the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 are all the same. After passing through the outdoor heat exchanger 17, the refrigerant can flow back to the gas-liquid separator 22 through the heat pump solenoid valve 12, or it can flow back to the gas-liquid separator 22 through the third electronic expansion valve 11 after passing through the battery cooling heat exchanger. Specifically, it can be controlled and regulated by the heat pump solenoid valve 12 and the third electronic expansion valve 11.

[0051] Since the battery cooling heat exchanger 21 is a structural component on the battery coolant loop 300, the second refrigeration loop and the battery coolant loop 300 are coupled to each other. The second refrigeration loop can exchange heat with the battery pack 29 through the battery cooling heat exchanger 21, that is, the heat of the battery pack 29 can be transferred to the coolant of the second refrigeration loop through the battery cooling heat exchanger 21. The heat of the electric drive assembly 28 can be recovered through the second refrigeration loop, and the battery pack 29 can be cooled by exchanging heat with the battery cooling heat exchanger 21, or the cooling needs of the battery pack 29 and the passenger compartment can be met.

[0052] This embodiment also includes a third refrigeration circuit, such as Figure 1 The third refrigeration circuit of the embodiment shown includes a compressor 1, a water-cooled condenser 19, a first electronic expansion valve 9, an outdoor heat exchanger 17, a second electronic expansion valve 10, an evaporator 15 and a gas-liquid separator 22, which are connected in series through pipelines to form a small circuit. Similarly, some components of the third refrigeration circuit and the first refrigeration circuit are the same, that is, the compressor 1, the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 are the same. After passing through the outdoor heat exchanger 17, the refrigerant can flow back to the gas-liquid separator 22 through the heat pump solenoid valve 12, or through the third electronic expansion valve 11 and then through the battery cooling heat exchanger to flow back to the gas-liquid separator 22, or through the second electronic expansion valve 10 and then through the evaporator 15 to flow back to the gas-liquid separator 22. The three refrigeration circuits correspond to three different control modes. When the heat pump solenoid valve 12 is in the open state, the second electronic expansion valve 10 and the third electronic expansion valve 11 are both in the closed state. Only when the heat pump solenoid valve 12 is in the closed state, the second electronic expansion valve 10 and the third electronic expansion valve 11 will be in the open state. The specific opening or closing is selected and adjusted according to actual needs.

[0053] The heat pump solenoid valve 12 is in the open state, mainly used in the battery pack heat pump heating mode, the passenger compartment heat pump heating mode and the battery pack and passenger compartment heat pump heating mode, that is, the heat pump solenoid valve 12 is opened mainly in the heating mode. The second electronic expansion valve 10 is in the open state, mainly used in the passenger compartment heating and dehumidification mode, the passenger compartment cooling and dehumidification mode, the passenger compartment cooling mode and the battery pack and passenger compartment cooling mode. The opening and closing control of the second electronic expansion valve 10 includes the cut-off state, the throttling state and the fully open state. The third electronic expansion valve 11 is in the open state, mainly used for the electric drive assembly waste heat recovery to the passenger compartment mode, the battery pack cooling mode, and the battery pack and passenger compartment cooling mode. The opening and closing control of the third electronic expansion valve 11 includes the cut-off state and the throttling state.

[0054] In a further embodiment of the present application, the present embodiment optimizes the above-mentioned heating cooling liquid circuit 400. Specifically, Figure 1 As shown, the heating coolant circuit 400 of this embodiment includes a first heating circuit and a second heating circuit, and the first heating circuit includes a water-cooled condenser 19, a water heater 2, a warm air core 16 and a third electronic water pump 8 which are sequentially connected in series through pipelines to form a small circuit. The first heating circuit is a circuit corresponding to the passenger compartment. Driven by the third electronic water pump 8, the coolant in the first heating circuit can flow back to the third electronic water pump 8 through the water-cooled condenser 19, the water heater 2 and the warm air core 16 in sequence, and the coolant in the first heating circuit can be heated by the water heater 2, thereby providing heating for the warm air core 16 of the passenger compartment.

[0055] The heating coolant circuit 400 also includes a second heating circuit, such as Figure 1 As shown, the second heating circuit includes a water-cooled condenser 19, a water heater 2, a battery heating heat exchanger 20 and a third electronic water pump 8 which are sequentially connected in series through pipelines to form a small circuit. A heating ratio three-way valve 3 is arranged between the first heating circuit and the second heating circuit, and the two circuits are coupled and connected to each other through the heating ratio three-way valve 3. The second heating circuit is a circuit corresponding to the battery pack 29. The coolant in the second heating circuit can be driven by the third electronic water pump 8 and can be sequentially returned to the third electronic water pump 8 through the water-cooled condenser 19, the water heater 2 and the battery heating heat exchanger 20. The coolant in the second heating circuit can be heated by the water heater 2, thereby exchanging heat with the battery heating heat exchanger 20 to achieve the purpose of heating the battery pack 29.

[0056] In actual use, the heating circuit can be controlled by the heating proportional three-way valve 3. For example, when heating the passenger compartment, the heating circuit can be connected as follows: Figure 1The first valve port and the second valve port of the heating proportional three-way valve 3 are shown to connect the first heating circuit. The coolant in the heating coolant circuit 400, driven by the third electronic water pump 8, flows back to the third electronic water pump 8 in sequence through the water-cooled condenser 19, the water heater 2, and the warm air core 16. The coolant in the first heating circuit can be heated by the water heater 2, thereby providing heating for the warm air core 16 of the passenger compartment. Of course, the coolant in the first heating circuit can also heat the water-cooled condenser 19 through the refrigerant circuit 100, thereby realizing the heating of the passenger compartment by the heat pump pipeline.

[0057] When the battery pack 29 needs to be heated, it can be connected to Figure 1 The first valve port and the third valve port of the heating proportional three-way valve 3 shown in the figure connect the second heating circuit. The coolant in the heating coolant circuit 400, driven by the third electronic water pump 8, flows back to the third electronic water pump 8 through the water-cooled condenser 19, the water heater 2, and the battery heating heat exchanger 20 in sequence. The coolant in the second heating circuit can be heated by the water heater 2, thereby performing heat exchange with the battery heating heat exchanger 20 on the battery coolant circuit 300, heating the coolant in the battery coolant circuit 300, and raising the temperature of the coolant flowing through the battery pack 29, thereby achieving the purpose of heating the battery pack 29. Of course, the coolant in the second heating circuit can also heat the water-cooled condenser 19 through the refrigerant circuit 100, thereby realizing the heating of the battery pack 29 by the heat pump pipeline.

[0058] When it is necessary to heat the battery pack 29 and the passenger compartment at the same time, the Figure 1 The first valve port, the second valve port, and the third valve port of the heating proportional three-way valve 3 shown in the figure make the first heating circuit and the second heating circuit both connected. The coolant in the heating coolant circuit 400, driven by the third electronic water pump 8, passes through the water-cooled condenser 19 and the water heater 2 in sequence, and then flows out through the second and third valve ports of the heating proportional three-way valve 3 in sequence. One way flows back to the third electronic water pump 8 through the warm air core 16, and the other way flows back to the third electronic water pump 8 through the battery heating heat exchanger 20, thereby realizing the heating requirements of the passenger compartment and the battery panel 29. Similarly, in the above-mentioned mode, the coolant in the heating coolant circuit 400 can also heat the water-cooled condenser 19 through the refrigerant circuit 100, thereby realizing the heating of the battery pack 29 and the passenger compartment by the heat pump pipeline.

[0059] In other embodiments of the present application, the present embodiment optimizes the connection relationship between the battery coolant circuit 300 and the electric drive coolant circuit 200. Specifically, Figure 1As shown, the battery coolant circuit 300 and the electric drive coolant circuit 200 are coupled and connected to each other through the electric drive coolant four-way reversing valve 5. That is, the coolant in the battery coolant circuit 300 and the electric drive coolant circuit 200 can flow in their respective circuits, or flow into another circuit, and different functional adjustments can be achieved by controlling the electric drive coolant four-way reversing valve 5.

[0060] In actual use, such as Figure 1 As shown, when the first valve port and the fourth valve port of the electric drive coolant four-way reversing valve 5 are connected, and the second valve port and the third valve port are connected, the battery coolant circuit 300 and the electric drive coolant circuit 200 are isolated from each other, and the coolant in the battery coolant circuit 300 and the electric drive coolant circuit 200 is not exchanged with each other; when the first valve port and the second valve port of the electric drive coolant four-way reversing valve 5 are connected, and the fourth valve port and the third valve port are connected, the battery coolant circuit 300 and the electric drive coolant circuit 200 form a loop, and the coolant between them circulates in the battery coolant circuit 300 and the electric drive coolant circuit 200.

[0061] like Figure 1 As shown, the battery coolant circuit 300 of this embodiment includes a battery pack 29, an electric drive coolant four-way reversing valve 5, a second electronic water pump 7, a battery cooling heat exchanger 21 and a battery heating heat exchanger 20, which are connected in series through pipelines to form a circuit. The battery coolant circuit 300 is connected to the second refrigeration circuit through the battery cooling heat exchanger 21, so it can exchange heat with the second refrigeration circuit through the battery cooling heat exchanger 21 to meet the cooling needs of the battery pack. The battery coolant circuit 300 is coupled to the heating coolant circuit 400 through the battery heating heat exchanger 20, and can exchange heat with the heating coolant circuit 400 through the battery heating heat exchanger 20, so it can meet the heating needs of the battery pack 29 through the battery heating heat exchanger 20.

[0062] In a preferred embodiment of the present application, the electric drive coolant circuit 200 is optimized. Specifically, Figure 1 As shown, the electric drive coolant circuit 200 of this embodiment includes a first electric drive cooling circuit and a second electric drive cooling circuit, the first electric drive cooling circuit includes an electric drive assembly 28, a motor radiator 18 and a first electronic water pump 6 which are sequentially connected in series through pipelines to form a circuit, and the second electric drive cooling circuit includes an electric drive assembly 28 and a first electronic water pump 6 which are sequentially connected in series through pipelines to form a circuit. The first electric drive cooling circuit and the second electric drive cooling circuit are coupled and communicated with each other through an electric drive coolant proportional three-way valve 4.

[0063] By controlling the electric drive coolant proportional three-way valve 4, different requirements can be met. Figure 1When the first valve port and the second valve port of the electric drive coolant proportional three-way valve 4 are connected, they can cooperate with the battery pack coolant circuit 300 to form a large circuit, realize the coolant circuit between the electric drive assembly 28 and the battery pack 29, and realize the operation of recovering the waste heat of the electric drive assembly 29 to the battery pack 29. Figure 1 When the first valve port, the second valve port and the third valve port of the electric drive coolant proportional three-way valve 4 are connected, the motor radiator 18 is mainly used to dissipate heat for the electric drive assembly 28, or it is used in the water filling mode and the water exhaust mode.

[0064] In actual use, under the driving action of the first electronic water pump 6, the coolant in the electric drive coolant circuit 200 first passes through the two-in-one module 27 and enters the electric drive assembly 28. After flowing out of the electric drive assembly 28, if Figure 1 The first valve port and the second valve port of the electric drive coolant proportional three-way valve 4 are connected, and the coolant flows out from the second valve port directly after passing through the first valve port of the electric drive coolant proportional three-way valve 4. If the first valve port and the fourth valve port of the electric drive coolant four-way reversing valve 5 are connected at this time, the coolant flows back to the first electronic water pump 6 directly after passing through the electric drive coolant four-way reversing valve 5 to complete the circulation; if the third valve port and the fourth valve port of the electric drive coolant four-way reversing valve 5 are connected at this time, the coolant enters the battery coolant circuit 300 directly through the electric drive coolant four-way reversing valve 5, circulates in the battery coolant circuit 300, flows through the second valve port and the first valve port of the electric drive coolant four-way reversing valve 5, and then flows back to the first electronic water pump 6 to complete the circulation;

[0065] If Figure 1 The first valve port, the second valve port and the third valve port of the electric drive coolant proportional three-way valve 4 are connected. After the coolant passes through the electric drive assembly 28, it is divided into two parts. One part flows back to the first electronic water pump 6 through the second valve port and the first valve port of the electric drive coolant proportional three-way valve 4 to complete the circulation, and the other part flows back to the first electronic water pump 6 through the motor radiator 18 from the third valve port and the first valve port of the electric drive coolant proportional three-way valve 4 to complete the circulation. This mode is mainly used to dissipate heat for the electric drive assembly 28.

[0066] In order to facilitate the heat dissipation of the electric drive assembly 28, the present embodiment is provided with a cooling fan 13 on one side of the motor radiator 18 relative to the outdoor heat exchanger 17. That is to say, the outdoor heat exchanger 17 and the cooling fan 13 are respectively provided on both sides of the motor radiator 18 of the present embodiment, so that the heat dissipation of the electric drive assembly 28 can be maximized.

[0067] In some embodiments of the present application, the present embodiment optimizes the electric drive coolant circuit 200 and the heating coolant circuit 400, such as Figure 1As shown, the electric drive coolant circuit 200 is provided with an electric drive coolant auxiliary water tank 24, and the heating coolant circuit 400 is provided with a heating coolant reservoir 25. The electric drive coolant auxiliary water tank 24 and the heating coolant reservoir 25 are provided for the convenience of water circuit filling and water circuit exhaust.

[0068] The working modes involved in the indirect heat pump thermal management system of this application are:

[0069] 1. Battery pack PTC heating mode

[0070] At this time, the heating coolant circuit 400 and the battery coolant circuit 300 are involved, the first valve port and the third valve port of the heating proportional three-way valve 3 are connected, the first valve port and the fourth valve port of the four-way reversing valve of the electric drive coolant circuit 200 are connected, the second valve port and the third valve port are connected, the second electronic water pump 7 is running, the third electronic water pump 8 is running, and the water heater 2 is started to heat the coolant flowing through;

[0071] Driven by the second electronic water pump 7, the coolant in the battery coolant loop 300 flows through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, and then flows through the second valve port and the third valve port of the electric drive coolant loop four-way reversing valve 5, and returns to the second electronic water pump 7, completing the circulation of the battery coolant loop 300;

[0072] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence, the water heater 2 heats the coolant flowing through, and the heated coolant flows through the first valve port and the third valve port of the heating proportional three-way valve 3 and enters the battery heating heat exchanger 20. Inside the battery heating heat exchanger 20, the coolant in the battery coolant loop 300 exchanges heat with the coolant in the heating coolant loop 400. The coolant in the heating coolant loop 400 heats the coolant in the battery coolant loop 300, thereby achieving the effect of heating the battery pack 29. The coolant flowing through the battery heating heat exchanger 20 finally flows back to the third electronic water pump 8, completing the circulation flow of the heating coolant loop 400.

[0073] 2. Passenger compartment PTC heating mode

[0074] At this time, the heating coolant loop 400 is involved, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first valve port and the fourth valve port of the electric drive coolant loop 200 four-way reversing valve are connected, the third electronic water pump 8 is running, and the water heater 2 is started to heat the coolant flowing through;

[0075] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The water heater 2 heats the coolant flowing through it. The heated coolant flows through the first valve port and the second valve port of the heating proportional three-way valve 3 and then enters the heater core 18. The heater core 18 releases heat to the passenger compartment to achieve the effect of heating the passenger compartment. The coolant flowing through the heater core 18 flows back to the third electronic water pump 8 to complete the circulation flow of the heating coolant loop 400.

[0076] 3. PTC heating mode for battery pack and passenger compartment

[0077] At this time, the heating coolant circuit 400 and the battery coolant circuit 300 are involved, the first valve port of the heating proportional three-way valve 3 is connected with the second valve port and the third valve port, the first valve port of the four-way reversing valve of the electric drive coolant circuit 200 is connected with the fourth valve port, the second electronic water pump 7 and the third electronic water pump 8 are running, the water heater 2 is started to heat the coolant flowing through, and the blower 14 is in operation;

[0078] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The water heater 2 heats the coolant flowing through it. The heated coolant passes through the heating proportional three-way valve 3 and is divided into two parts. One part enters the heater core 18 through the second valve port outlet of the heating proportional three-way valve 3. The heater core 18 releases heat to the passenger compartment. The blower 14 blows the heated air to the passenger compartment to achieve the effect of heating the passenger compartment. The other part passes through the third valve port outlet of the heating proportional three-way valve 3. The outlet enters the battery heating heat exchanger 20, inside the battery heating heat exchanger 20, the coolant in the battery coolant loop 300 exchanges heat with the coolant in the heating coolant loop 400, the coolant in the heating coolant loop 400 heats up the coolant in the battery coolant loop 300, so as to achieve the effect of heating the battery pack 29, and the coolant flowing through the battery heating heat exchanger 20 finally flows back to the third electronic water pump 8; finally, all the coolant flows back to the third electronic water pump 8, completing the circulation flow of the heating coolant loop 400.

[0079] 4. Battery pack heat pump heating mode

[0080] At this time, the refrigerant circuit 100, the battery coolant circuit 300 and the heating coolant circuit 400 are involved. The first valve port and the third valve port of the heating proportional three-way valve 3 are connected, and the second valve port and the third valve port of the four-way reversing valve of the electric drive coolant circuit 200 are connected. The first electronic expansion valve 9 is in a throttling state, the third electronic expansion valve 11 is in a cut-off state, the heat pump solenoid valve 12 is in an open state, the second electronic expansion valve 10 is in a cut-off state, the second electronic water pump 7 and the third electronic water pump 8 are running, the compressor 1 is running, and the outdoor heat exchanger 17 is in a heat exchange state;

[0081] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, enters the gas-liquid separator 22 through the heat pump solenoid valve 12, and finally flows back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant in the refrigerant circuit 100 will flow through the water-cooled condenser 19, and will perform heat exchange with the coolant in the heating coolant circuit 400 through the water-cooled condenser 19, so that the temperature of the coolant in the heating coolant circuit 400 rises;

[0082] Driven by the second electronic water pump 7, the coolant in the battery coolant loop 300 flows through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, and then flows through the second valve port and the third valve port of the electric drive coolant loop four-way reversing valve 5, and returns to the second electronic water pump 7, completing the circulation of the battery coolant loop 300;

[0083] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The coolant flowing through the water-cooled condenser 19 will be heated due to heat exchange with the refrigerant loop 100. The heated coolant flows through the first valve port and the third valve port of the heating proportional three-way valve 3 and then enters the battery heating heat exchanger 20. Inside the battery heating heat exchanger 20, the coolant in the battery coolant loop 300 exchanges heat with the coolant in the heating coolant loop 400. The coolant in the heating coolant loop 400 heats up the coolant in the battery coolant loop 300, thereby achieving the effect of heating the battery pack 29. The coolant flowing through the battery heating heat exchanger 20 finally flows back to the third electronic water pump 8, completing the circulation of the heating coolant loop 400.

[0084] Therefore, in this mode, the refrigerant circuit 100 heats up the coolant in the heating coolant circuit 400 through the water-cooled condenser 19 , and the heating coolant circuit 400 heats up the coolant in the battery coolant circuit 300 through the battery heating heat exchanger 20 , thereby achieving the effect of heating the battery pack 29 .

[0085] 5. Passenger cabin heat pump heating mode

[0086] At this time, the refrigerant circuit 100 and the heating coolant circuit 400 are involved, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first electronic expansion valve 9 is in a throttling state, the third electronic expansion valve 11 is in a cut-off state, the heat pump solenoid valve 12 is in an open state, the second electronic expansion valve 10 is in a cut-off state, the third electronic water pump 8 is running, the compressor 1 is running, the blower 14 is in an open state, and the outdoor heat exchanger 17 is in a heat exchange state;

[0087] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, enters the gas-liquid separator 22 through the heat pump solenoid valve 12, and finally flows back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant in the refrigerant circuit 100 will flow through the water-cooled condenser 19, and will perform heat exchange with the coolant in the heating coolant circuit 400 through the water-cooled condenser 19, so that the temperature of the coolant in the heating coolant circuit 400 rises;

[0088] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The coolant flowing through the water-cooled condenser 19 is heated due to heat exchange with the refrigerant loop 100. The heated coolant flows through the first valve port and the second valve port of the heating proportional three-way valve 3 and then enters the heater core 18. The heater core 18 releases heat to the passenger compartment. The blower 14 blows the heated air to the passenger compartment to achieve the effect of heating the passenger compartment. After passing through the heater core 18, the air flows back to the third electronic water pump 8 to complete the circulation of the heating coolant loop 400.

[0089] In this process, the heat source for heating the coolant in the heating coolant circuit 400 is the water-cooled condenser 19 , and the refrigerant circuit 100 provides heat energy to the water-cooled condenser 19 .

[0090] 6. Battery pack and passenger compartment heat pump heating mode

[0091] At this time, the refrigerant circuit 100, the battery coolant circuit 300 and the heating coolant circuit 400 are involved. The first valve port, the second valve port and the third valve port of the heating proportional three-way valve 3 are connected. The second valve port and the third valve port of the four-way reversing valve of the electric drive coolant circuit 200 are connected. The first electronic expansion valve 9 is in a throttling state, the third electronic expansion valve 11 is in a cut-off state, the heat pump solenoid valve 12 is in an open state, the second electronic expansion valve 10 is in a cut-off state, the second electronic water pump 7 and the third electronic water pump 8 are running, the compressor 1 is running, the blower 14 is in an open state, and the outdoor heat exchanger 17 is in a heat exchange state;

[0092] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, enters the gas-liquid separator 22 through the heat pump solenoid valve 12, and finally flows back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant in the refrigerant circuit 100 will flow through the water-cooled condenser 19, and will perform heat exchange with the coolant in the heating coolant circuit 400 through the water-cooled condenser 19, so that the temperature of the coolant in the heating coolant circuit 400 rises;

[0093] Driven by the second electronic water pump 7, the coolant in the battery coolant loop 300 flows through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, and then flows through the second valve port and the third valve port of the electric drive coolant loop four-way reversing valve 5, and returns to the second electronic water pump 7, completing the circulation of the battery coolant loop 300;

[0094] Driven by the third electronic water pump 8, the coolant in the heating coolant circuit 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The coolant flowing through the water-cooled condenser 19 will be heated due to heat exchange with the refrigerant circuit 100. The heated coolant passes through the heating proportional three-way valve 3 and is divided into two parts. One part enters the heater core 18 through the second valve port outlet of the heating proportional three-way valve 3. The heater core 18 releases heat to the passenger compartment, and the blower 14 blows the heated air to the passenger compartment to achieve the effect of heating the passenger compartment; the other part passes through the heating proportional three-way valve 3. The third valve port outlet of the three-way valve 3 enters the battery heating heat exchanger 20. Inside the battery heating heat exchanger 20, the coolant in the battery coolant loop 300 exchanges heat with the coolant in the heating coolant loop 400. The coolant in the heating coolant loop 400 heats up the coolant in the battery coolant loop 300, thereby achieving the effect of heating the battery pack 29. The coolant flowing through the battery heating heat exchanger 20 finally flows back to the third electronic water pump 8. Finally, all the coolant flows back to the third electronic water pump 8, completing the circulation of the heating coolant loop 400.

[0095] In this mode, heating of the battery pack 29 and the passenger compartment is achieved through the refrigerant circuit 100 .

[0096] 7. Electric drive assembly waste heat recovery to battery pack mode

[0097] At this time, the electric drive coolant circuit 200 and the battery coolant circuit 300 are involved, the first valve port and the second valve port of the electric drive coolant proportional three-way valve 4 are connected, the first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, and the fourth valve port and the third valve port are connected, and the first electronic water pump 6 and the second electronic water pump 7 are in operation;

[0098] Driven by the first electronic water pump 6 and the second electronic water pump 7, the coolant in the electric drive coolant loop 200 and the battery coolant loop 300 circulates in the formed large loop, passes through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in turn, and then flows out through the first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant loop 200 into the electric drive coolant loop 200. Under the action of the first electronic water pump 6, it flows through the two-in-one module 27, the electric drive assembly 29 in turn. After 28, it flows out from the second valve port and the first valve port of the electric drive coolant proportional three-way valve 4, and then flows back to the battery coolant circuit 300 through the fourth valve port and the third valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 for circulation. In this process, when the coolant flows through the electric drive assembly 28, it will absorb the heat of the electric drive assembly 28 to heat up, and when it flows through the battery pack 29, it will exchange heat with the battery pack 29, so as to achieve the purpose of heating the battery pack 29 and complete the effect of waste heat recovery of the electric drive assembly 28.

[0099] 8. Electric drive assembly waste heat recovery to passenger compartment mode

[0100] At this time, the electric drive coolant circuit 200, the battery coolant circuit 300, the refrigerant circuit 100 and the heating coolant circuit 400 are involved. The first valve port and the second valve port of the electric drive coolant proportional three-way valve 4 are connected, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, and the fourth valve port is connected with the third valve port. The first electronic expansion valve 9 is fully open, the third electronic expansion valve 11 is in a throttling state, the heat pump solenoid valve 12 is in a closed state, the second electronic expansion valve 10 is in a cut-off state, the first electronic water pump 6, the second electronic water pump 7 and the third electronic water pump 8 are in operation, the compressor 1 is in operation, and the blower 14 is in operation.

[0101] Driven by the first electronic water pump 6 and the second electronic water pump 7, the coolant in the electric drive coolant loop 200 and the battery coolant loop 300 circulates in the formed large loop, passes through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, and then flows out through the first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant loop 200 into the electric drive coolant loop 200. Under the action of the first electronic water pump 6, it flows through the two-in-one module 27 in sequence. , the electric drive assembly 28, flows out from the second valve port and the first valve port of the electric drive coolant proportional three-way valve 4, and then flows back to the battery coolant circuit 300 through the fourth valve port and the third valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 for circulation. In this process, when the coolant flows through the electric drive assembly 28, it absorbs the heat of the electric drive assembly 28 to increase the temperature, and when it flows through the battery cooling heat exchanger 21, it exchanges heat with the refrigerant in the refrigerant circuit 100 through the battery cooling heat exchanger 21;

[0102] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, and then enters the battery cooling heat exchanger 21 through the third electronic expansion valve 11. The coolant flowing through the battery cooling heat exchanger 21 will exchange heat, that is, the refrigerant in the refrigerant circuit 100 is heated by the battery coolant circuit 300, and the heated refrigerant enters the gas-liquid separator 22, and finally flows back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant in the refrigerant circuit 100 will flow through the water-cooled condenser 19, and will exchange heat with the coolant in the heating coolant circuit 400 through the water-cooled condenser 19, so that the temperature of the coolant in the heating coolant circuit 400 rises;

[0103] Driven by the third electronic water pump 8, the coolant in the heating coolant loop 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The coolant flowing through the water-cooled condenser 19 is heated due to heat exchange with the refrigerant loop 100. The heated coolant flows through the first valve port and the second valve port of the heating proportional three-way valve 3 and then enters the heater core 18. The heater core 18 releases heat to the passenger compartment. The blower 14 blows the heated air to the passenger compartment to achieve the effect of heating the passenger compartment. After passing through the heater core 18, the air flows back to the third electronic water pump 8 to complete the circulation of the heating coolant loop 400.

[0104] In this process, the heat source for heating the coolant in the heating coolant circuit 400 is the water-cooled condenser 19, and the battery cooling heat exchanger 21 of the refrigerant circuit 100 provides heat energy to the water-cooled condenser 19, and the electric drive assembly 28 provides heat energy to the battery cooling heat exchanger 21. Therefore, this mode recovers the waste heat of the electric drive assembly 28 to the passenger compartment.

[0105] 9. Heating and dehumidification mode in passenger compartment

[0106] At this time, the heating coolant circuit 400 and the refrigerant circuit 100 are involved, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first electronic expansion valve 9 is in a throttling state, the third electronic expansion valve 11 is in a cut-off state, the heat pump solenoid valve 12 is in a closed state, the second electronic expansion valve 10 is in a fully open state, the third electronic water pump 8 is running, the compressor 1 is running, the blower 14 is in a running state, and the outdoor heat exchanger 17 is in a heat exchange state;

[0107] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, enters the evaporator 15 through the second electronic expansion valve 10, and then enters the gas-liquid separator 22, and finally flows back to the compressor 1, completing the circulation flow of the refrigerant circuit 100; in this process, the refrigerant in the refrigerant circuit 100 will flow through the water-cooled condenser 19, and will exchange heat with the coolant in the heating coolant circuit 400 through the water-cooled condenser 19, so that the temperature of the coolant in the heating coolant circuit 400 rises. At this time, the heat source is mainly to heat the refrigerant by absorbing the heat of the external gas through the outdoor heat exchanger 17, and the heated refrigerant exchanges heat in the water-cooled condenser 19 to heat and increase the temperature of the coolant;

[0108] Driven by the third electronic water pump 8, the coolant in the heating coolant circuit 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence. The coolant flowing through the water-cooled condenser 19 will be heated due to heat exchange with the refrigerant circuit 100. The heated coolant flows through the first valve port and the second valve port of the heating proportional three-way valve 3 and then enters the heater core 18. The heater core 18 releases heat to the passenger compartment, and the blower 14 blows the heated air to the passenger compartment; the evaporator 15 dehumidifies the air blown to the passenger compartment, thereby achieving the effect of heating and dehumidifying the passenger compartment.

[0109] 10. Passenger compartment cooling and dehumidification mode

[0110] At this time, the heating coolant circuit 400 and the refrigerant circuit 100 are involved, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first electronic expansion valve 9 is in a fully open state, the third electronic expansion valve 11 is in a cut-off state, the heat pump solenoid valve 12 is in a closed state, the second electronic expansion valve 10 is in a throttling state, the third electronic water pump 8 is running, the compressor 1 is running, the blower 14 is in a running state, and the outdoor heat exchanger 17 is in a heat exchange state;

[0111] Under the action of the compressor 1, the refrigerant of the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence. After the coolant flows through the outdoor heat exchanger 17, the outdoor heat exchanger 17 will reduce the temperature of the coolant flowing through by dissipating heat outwards. The coolant with reduced temperature enters the evaporator 15 through the second electronic expansion valve 10. The evaporator 15 cools the passenger compartment, then enters the gas-liquid separator 22, and finally flows back to the compressor 1, completing the circulation flow of the refrigerant circuit 100;

[0112] Driven by the third electronic water pump 8, the coolant in the heating coolant circuit 400 flows through the water-cooled condenser 19 and the water heater 2 in sequence, and then flows through the first valve port and the second valve port of the heating proportional three-way valve 3 and enters the heater core 18. The heater core 18 cools the passenger compartment, and the blower 14 blows the cooled air to the passenger compartment; the evaporator 15 dehumidifies the air blown to the passenger compartment, thereby achieving the effect of cooling and dehumidifying the passenger compartment.

[0113] 11. Electric drive assembly air cooling mode

[0114] At this time, the electric drive coolant circuit 200 is involved, the first valve port and the third valve port of the electric drive coolant proportional three-way valve 4 are connected, the first valve port and the fourth valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, and the second valve port and the third valve port are connected, the first electronic water pump 6 is running, and the outdoor heat exchanger 17 is in a heat exchange state;

[0115] Under the action of the first electronic water pump 6, the coolant in the electric drive coolant loop 200 passes through the two-in-one module 27 and the electric drive assembly 28 in sequence, and then enters the motor radiator 18, where it dissipates heat under the action of the outdoor heat exchanger 17. After the coolant is cooled by the motor radiator 18, it flows out through the third valve port and the first valve port of the electric drive coolant proportional three-way valve 4, and finally flows through the first valve port and the fourth valve port of the four-way reversing valve 5 of the electric drive coolant loop 200, until it flows back to the first electronic water pump 6, completing the circulation of the coolant in the electric drive coolant loop 200;

[0116] This mode cools the electric drive assembly 28 through the outdoor heat exchanger 17 and the cooling fan 13;

[0117] 12. Air cooling mode for electric drive assembly and battery pack

[0118] At this time, the electric drive coolant circuit 200 and the battery coolant circuit 300 are involved. The first valve port and the second valve port of the electric drive coolant proportional three-way valve 4 are connected, the first valve port and the second valve port of the heating proportional three-way valve 3 are connected, the first valve port and the second valve port of the electric drive coolant circuit 200 four-way reversing valve 5 are connected, and the fourth valve port is connected to the third valve port. The first electronic water pump 6 and the second electronic water pump 7 are running, and the outdoor heat exchanger 17 is in a heat exchange state;

[0119] Driven by the first electronic water pump 6 and the second electronic water pump 7, the coolant in the electric drive coolant loop 200 and the battery coolant loop 300 circulates in the formed large loop, passes through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, flows out through the first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant loop 200 and enters the electric drive coolant loop 200. Under the action of the first electronic water pump 6, it flows through the two-in-one module 27 and the electric drive assembly 28 in sequence, and enters the motor radiator 18. Heat is dissipated under the action of the outdoor heat exchanger 17. After the coolant is cooled down by the motor radiator 18, it flows out through the third valve port and the first valve port of the electric drive coolant proportional three-way valve 4, and then flows back to the battery coolant circuit 300 through the fourth valve port and the third valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 for circulation. In this process, the coolant will heat up when flowing through the electric drive assembly 28 and the battery pack 29, and finally dissipate heat through the outdoor heat exchanger 17. This mode can achieve cooling operations on the electric drive assembly 28 and the battery pack 29.

[0120] 13. Battery pack cooling mode

[0121] At this time, the battery coolant circuit 300 and the refrigerant circuit 100 are involved, the first valve port and the fourth valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, the second valve port and the third valve port are connected, the first electronic expansion valve 9 is fully open, the third electronic expansion valve 11 is in a throttling state, the heat pump solenoid valve 12 is in a closed state, the second electronic expansion valve 10 is in a cut-off state, the second electronic water pump 7 is running, the compressor 1 is running, and the outdoor heat exchanger 17 is in a heat exchange state;

[0122] Under the action of the compressor 1, the refrigerant of the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, and then enters the battery cooling heat exchanger 21 through the third electronic expansion valve 11, and exchanges heat with the coolant in the battery coolant circuit 300 in the battery cooling heat exchanger 21, and cools down the coolant in the battery coolant circuit 300 (the outdoor heat exchanger 17 is in a heat exchange state, and the temperature of the refrigerant in the refrigerant circuit 100 can be reduced by dissipating heat outward), and after flowing out of the battery cooling heat exchanger 21, it will enter the gas-liquid separator 22, and finally flow back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant of the refrigerant circuit 100 will flow through the battery cooling heat exchanger 21, and will exchange heat with the coolant in the battery coolant circuit 300 through the battery cooling heat exchanger 21, so that the temperature of the coolant in the battery coolant circuit 300 will decrease;

[0123] Driven by the second electronic water pump 7, the coolant in the battery coolant loop 300 flows through the battery cooling heat exchanger 21, the battery heating heat exchanger 20, and the battery pack 29 in sequence, and then flows through the second valve port and the third valve port of the electric drive coolant loop four-way reversing valve 5, and returns to the second electronic water pump 7 to complete the circulation flow of the battery coolant loop 300; in this process, the coolant flowing through the battery cooling heat exchanger 21 will exchange heat in the battery cooling heat exchanger 21, and the high-temperature coolant will be cooled by the refrigerant in the refrigerant loop 100 flowing through the battery cooling heat exchanger 21, so that the temperature of the coolant entering the battery pack 29 is greatly reduced, thereby achieving the effect of cooling and cooling the battery pack 29.

[0124] 14. Passenger compartment cooling mode

[0125] At this time, the refrigerant circuit 100 is involved, the first electronic expansion valve 9 is fully open, the third electronic expansion valve 11 is in the cut-off state, the heat pump solenoid valve 12 is in the closed state, the second electronic expansion valve 10 is in the throttling state, the compressor 1 is running, and the outdoor heat exchanger 17 is in the heat exchange state:

[0126] Under the action of the compressor 1, the refrigerant of the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, enters the evaporator 15 through the second electronic expansion valve 10, and then enters the gas-liquid separator 22, and finally flows back to the compressor 1, completing the circulation of the refrigerant circuit 100; in this process, the refrigerant of the refrigerant circuit 100 will flow through the outdoor heat exchanger 17, and the outdoor heat exchanger 17 will dissipate heat outward in the heat exchange state, so as to achieve the effect of cooling the coolant, and the cooled coolant will enter the evaporator 15, so as to achieve the purpose of providing cooling air to the passenger compartment;

[0127] 15. Battery pack and passenger compartment cooling mode

[0128] At this time, the battery coolant circuit 300 and the refrigerant circuit 100 are involved, the first valve port and the fourth valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, the second valve port and the third valve port are connected, the first electronic expansion valve 9 is fully open, the third electronic expansion valve 11 is in a throttling state, the heat pump solenoid valve 12 is in a closed state, the second electronic expansion valve 10 is in a throttling state, the second electronic water pump 7 is running, the compressor 1 is running, and the outdoor heat exchanger 17 is in a heat exchange state;

[0129] Under the action of the compressor 1, the refrigerant in the refrigerant circuit 100 flows through the water-cooled condenser 19, the first electronic expansion valve 9, and the outdoor heat exchanger 17 in sequence, and then is divided into two parts. One part enters the evaporator 15 through the second electronic expansion valve 10, and then enters the gas-liquid separator 22, and finally flows back to the compressor 1; the other part passes through the third electronic expansion valve 11, passes through the battery heating heat exchanger 20, and then enters the gas-liquid separator 22, and finally flows back to the compressor 1; in this process, the refrigerant in the refrigerant circuit 100 will flow through the outdoor heat exchanger 17, and the outdoor heat exchanger 17 will dissipate heat outward in the heat exchange state, so as to achieve the effect of cooling the coolant. The cooled coolant will enter the evaporator 15 and the battery heating heat exchanger 20, so as to achieve the purpose of cooling the passenger compartment and the battery pack 29;

[0130] 16. Water filling mode

[0131] At this time, the heating coolant circuit 400, the battery coolant circuit 300 and the electric drive coolant circuit 200 are involved. The first valve port, the second valve port and the third valve port of the heating proportional three-way valve 3 are connected. The first valve port, the second valve port and the third valve port of the three-way valve of the electric drive coolant circuit 200 are connected. The first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, and the third valve port is connected with the fourth valve port. All water pumps and compressors are in the closed state.

[0132] The battery coolant circuit 300 and the electric drive coolant circuit 200 are filled through the electric drive coolant auxiliary water tank 24 and the electric drive and battery pack coolant circuit filling port 23, and the heating coolant circuit 400 is filled through the heating coolant circuit 400 storage pot 25;

[0133] 17. Waterway exhaust mode

[0134] At this time, the heating coolant circuit 400, the battery coolant circuit 300 and the electric drive coolant circuit 200 are involved. The first valve port, the second valve port and the third valve port of the heating proportional three-way valve 3 are connected. The first valve port, the second valve port and the third valve port of the three-way valve of the electric drive coolant circuit 200 are connected. The first valve port and the second valve port of the four-way reversing valve 5 of the electric drive coolant circuit 200 are connected, and the third valve port is connected with the fourth valve port. The first electronic water pump 6, the second electronic water pump 7 and the third electronic water pump 8 are running, and the compressor 1 is in the off state.

[0135] The first electronic water pump 6 , the second electronic water pump 7 and the third electronic water pump 8 drive the coolant in their respective circuits to flow, thereby achieving the effect of water circuit exhaust.

[0136] 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. An indirect heat pump type thermal management system, characterized in that: It comprises an electric drive coolant circuit (200), a battery coolant circuit (300), a heating coolant circuit (400) and a refrigerant circuit (100); The heating coolant circuit (400) comprises a first heating circuit and a second heating circuit which are coupled and connected to each other; the first heating circuit is connected in series with a heater core (16) for heating the passenger compartment; the second heating circuit exchanges heat with the battery coolant circuit (300) via a battery heating heat exchanger (20); The refrigerant circuit (100) is connected in series with a compressor (1), and the refrigerant circuit (100) comprises a first refrigeration circuit, a second refrigeration circuit and a third refrigeration circuit that are coupled and connected to each other; the first refrigeration circuit exchanges heat with a heating coolant circuit (400) via a water-cooled condenser (19); the second refrigeration circuit exchanges heat with a battery coolant circuit (300) via a battery cooling heat exchanger (21); the third refrigeration circuit is connected in series with an evaporator (15) for cooling the passenger compartment; The battery coolant circuit and the electric drive coolant circuit (200) are coupled and communicated with each other.

2. An indirect heat pump type thermal management system according to claim 1, characterized in that: The first refrigeration circuit comprises a compressor (1), a water-cooled condenser (19), a first electronic expansion valve (9), an outdoor heat exchanger (17), a heat pump solenoid valve (12) and a gas-liquid separator (22), which are sequentially connected in series through pipelines to form a small circuit; the outdoor heat exchanger (17) is arranged in parallel with a motor radiator (18) on the electric drive coolant circuit (200).

3. An indirect heat pump type thermal management system according to claim 2, characterized in that: The second refrigeration circuit comprises a compressor (1), a water-cooled condenser (19), a first electronic expansion valve (9), an outdoor heat exchanger (17), a third electronic expansion valve (11), a battery cooling heat exchanger (21) and a gas-liquid separator (22) which are sequentially connected in series through pipelines to form a small circuit.

4. An indirect heat pump type thermal management system according to claim 2 or 3, characterized in that: The third refrigeration circuit comprises a compressor (1), a water-cooled condenser (19), a first electronic expansion valve (9), an outdoor heat exchanger (17), a second electronic expansion valve (10), an evaporator (15) and a gas-liquid separator (22) which are sequentially connected in series through pipelines to form a small circuit.

5. The indirect heat pump type thermal management system according to claim 1, characterized in that: The first heating circuit comprises a water-cooled condenser (19), a water heater (2), a warm air core (16) and a third electronic water pump (8) which are sequentially connected in series through pipelines to form a small circuit.

6. An indirect heat pump type thermal management system according to claim 5, characterized in that: The second heating circuit comprises a water-cooled condenser (19), a water heater (2), a battery heating heat exchanger (20) and a third electronic water pump (8) which are sequentially connected in series through pipelines to form a small circuit; a heating proportional three-way valve (3) is arranged between the first heating circuit and the second heating circuit, and the two circuits are coupled and connected to each other through the heating proportional three-way valve (3).

7. An indirect heat pump type thermal management system according to claim 1, characterized in that: The battery coolant circuit and the electric drive coolant circuit (200) are coupled and communicated with each other via an electric drive coolant four-way reversing valve (5).

8. An indirect heat pump type thermal management system according to claim 7, characterized in that: The battery coolant loop (300) comprises a battery pack (29), an electric drive coolant four-way reversing valve (5), a second electronic water pump (7), a battery cooling heat exchanger (21), and a battery heating heat exchanger (20), which are sequentially connected in series through pipelines to form a loop.

9. An indirect heat pump type thermal management system according to claim 8, characterized in that: The electric drive coolant circuit (200) comprises a first electric drive cooling circuit and a second electric drive cooling circuit; the first electric drive cooling circuit comprises an electric drive assembly (28), a motor radiator (18) and a first electronic water pump (6) which are sequentially connected in series through pipelines to form a circuit; the second electric drive cooling circuit comprises an electric drive assembly (28) and a first electronic water pump (6) which are sequentially connected in series through pipelines to form a circuit.

10. An indirect heat pump type thermal management system according to claim 9, characterized in that: The first electric drive cooling circuit and the second electric drive cooling circuit are coupled and communicated with each other via an electric drive coolant proportional three-way valve (4).

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