A thermal management system and a vehicle

Abstract

The present invention provides a thermal management system and a vehicle. The thermal management system includes a first main circuit, a second main circuit, a first sub-circuit, a second sub-circuit and a third sub-circuit. The first main circuit includes a low-temperature radiator, an outlet water pipeline and a return water pipeline. The first sub-circuit includes a condenser. The water inlet end of the first sub-circuit is connected to the outlet water pipeline, and the water outlet end is connected to the return water pipeline. The second sub-circuit includes an intercooling heat exchanger. The water inlet end of the second sub-circuit is connected to the outlet water pipeline, and the water outlet end is connected to the return water pipeline. The second main circuit includes an engine radiator. The third sub-circuit includes a heater core of an air conditioner. The water inlet end and the water outlet end of the third sub-circuit are both connected to the engine. In the thermal management system and the vehicle of the present invention, multiple sub-circuits are arranged in parallel in two independent main circuits respectively. By controlling each sub-circuit, the thermal management of the corresponding area can be realized, the structure is simplified, the heat management functionality is stronger, and the thermal management efficiency of the vehicle is improved.

Description

Technical Field

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

[0002] During the use of a vehicle, thermal management needs to be carried out on various parts inside the vehicle. Since the thermal management requirements of each part are different, for example, the engine / motor requires a relatively high cooling demand for heat dissipation, the power battery requires a continuous medium cooling demand for heat dissipation, and the temperature requirements inside the passenger compartment are more complex, sometimes heating is required and sometimes cooling is required. In order to meet the thermal management requirements of various parts inside the vehicle, multiple circuits are specifically set up in the prior art to separately perform thermal management on each component that needs to dissipate heat. Such a thermal management system has a complex structure, a single function, low energy utilization rate, and cannot maximize the thermal management efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a thermal management system and a vehicle to solve the technical problem of low thermal management efficiency of the vehicle caused by the complex structure and single function in the thermal management system of the vehicle in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] Provide a thermal management system, including:

[0006] A first main circuit for dissipating heat from the electronic control unit and the electromechanical coupling system. The first main circuit includes a low-temperature radiator, an outlet pipeline, and a return pipeline;

[0007] A first sub-circuit. The first sub-circuit includes a condenser for dissipating heat from the power battery and the air-conditioning evaporator. The water inlet end of the first sub-circuit is connected to the outlet pipeline, and the water outlet end of the first sub-circuit is connected to the return pipeline;

[0008] A second sub-circuit. The second sub-circuit includes an intercooler heat exchanger for dissipating heat from the engine and / or the turbine. The water inlet end of the second sub-circuit is connected to the outlet pipeline, and the water outlet end of the second sub-circuit is connected to the return pipeline;

[0009] A second main circuit. The second main circuit includes an engine radiator for dissipating heat from the engine;

[0010] A third sub-circuit. The third sub-circuit includes the heater core of the air conditioner. The water inlet end and the water outlet end of the third sub-circuit are both connected to the engine.

[0011] Optionally, a plurality of control valves capable of adjusting the flow rate and / or changing the flow direction are provided on the first main circuit. The first sub-circuit and the second sub-circuit are connected to the first main circuit through the corresponding plurality of control valves, and the first sub-circuit and the second sub-circuit form a parallel relationship.

[0012] Optionally, the multiple control valves include a first three-way valve, a first reversing valve provided on the outlet water pipeline, and a second three-way valve and a third three-way valve provided on the return water pipeline; the water inlet end of the first sub-loop is connected to the first reversing valve, and the water outlet end of the first sub-loop is connected to the second three-way valve; the water inlet end of the second sub-loop is connected to the first three-way valve, and the water outlet end of the second sub-loop is connected to the third three-way valve.

[0013] Optionally, a first water pump is provided between the third three-way valve and the low-temperature radiator, a second water pump is provided on the second main loop, and a third water pump is provided on the water inlet end of the third sub-loop. Optionally, the first sub-loop further includes an air-conditioning loop and a battery loop that are connected in parallel with each other. The water inlet ends of the air-conditioning loop and the battery loop are connected to the water outlet end of the condenser, and the water outlet ends of the air-conditioning loop and the battery loop are connected to the water inlet end of the condenser; an evaporator and a first expansion valve are connected in series on the air-conditioning loop, and a power battery radiator and a second expansion valve are connected in series on the battery loop.

[0014] Optionally, a compressor is provided between the water outlet ends of the air-conditioning loop and the battery loop and the condenser.

[0015] Optionally, the third sub-loop includes a thermal-sensitive loop and a passage that are connected in parallel between the water inlet end of the third sub-loop and the heater core. The thermal-sensitive loop is provided with a thermistor, and the passage is a direct pipeline connection.

[0016] Optionally, a second reversing valve for controlling the flow rate ratio of the thermal-sensitive loop and the passage is provided at the water inlet end of the third sub-loop.

[0017] Optionally, the thermal management system further includes a first cooling device connected to the first main loop and a second cooling device connected to the second main loop.

[0018] The present invention also provides a vehicle, including the above-mentioned thermal management system.

[0019] The beneficial effects of the thermal management system and the vehicle provided by the present invention are as follows:

[0020] In the heat management system according to the embodiments of the present invention, the heat management of the electronic control unit and the electromechanical coupling system is realized through the first main circuit, the heat management of the engine is carried out through the first main circuit, and moreover, the heat management of the power battery and the air-conditioning evaporator is realized through the first sub-circuit in the first main circuit, and the heat management of the turbine and the engine is realized through the second sub-circuit in the first main circuit. Additionally, the heat exchange between the engine and the passenger compartment can be achieved through the third sub-circuit, thereby adjusting the temperature of the passenger compartment. The heat management system according to the embodiments of the present invention combines multiple circuits, and multiple sub-circuits are arranged in parallel within the main circuit. By controlling each sub-circuit, the heat management of the corresponding area can be realized. Since some structures of the multiple sub-circuits within the same main circuit are shared, the structure of the heat management system is streamlined as a whole, and the functionality is improved. The division of the two main circuits also takes into account the efficient utilization of energy. Therefore, it has the advantages of a more streamlined structure, stronger heat management functionality, and high energy consumption utilization rate, improving the heat management efficiency of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 FIG. is a schematic diagram of the overall structure of the heat management system provided by an embodiment of the present invention.

[0023] Among them, the reference numerals in the figure are as follows:

[0024] 11 - low-temperature radiator; 12 - outlet pipeline; 13 - return pipeline; 14 - electronic control unit; 15 - electromechanical coupling system; 16 - first cooling device; 111 - condenser; 112 - power battery radiator; 113 - air-conditioning evaporator; 114 - first expansion valve; 115 - second expansion valve; 116 - compressor; 121 - intercooling heat exchanger; 122 - turbine;

[0025] 21 - engine radiator; 212 - engine; 221 - thermistor; 222 - heater core; 26 - second cooling device;

[0026] 31 - first three-way valve; 32 - second three-way valve; 33 - third three-way valve; 41 - first water pump; 42 - second water pump; 43 - third water pump; 51 - first steering valve; 52 - second steering valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] It is easy to understand that the accurate definitions of the terms "series connection" and "parallel connection" are two connection methods in an electric circuit. Among them, series connection means that all circuit elements are connected end to end one by one in sequence through wires, and parallel connection means that all circuit elements are connected head to head and tail to tail. Since there is a certain similarity between the circuit system and the liquid circuit system, the technical terms of series connection and parallel connection are often borrowed in the common knowledge in this field. In the liquid circuit system, the so-called series connection means that various devices through which the liquid flows are connected end to end one by one in sequence through pipelines, that is, the liquid flows through each device in sequence; the so-called parallel connection in the liquid circuit system means that each device is connected head to head and tail to tail, and the liquid flows into each device respectively according to the preset pipelines and converges after flowing out.

[0031] Please refer to Figure 1 , and a thermal management system provided by an embodiment of the present invention will be described below. In this embodiment, the thermal management system dissipates heat through the flow of the coolant. The coolant can be pure water, water dissolved with special compounds, or cooling oil. The specific composition of the coolant is not the focus of this embodiment.

[0032] As Figure 1 shown, a thermal management system in this embodiment mainly includes two independent heat dissipation loops: a low-temperature cooling loop and a high-temperature cooling loop.

[0033] Among them, the low-temperature cooling loop includes a first main loop for dissipating heat from the electronic control unit and the electromechanical coupling system, and a first sub-loop and a second sub-loop connected in parallel within the first main loop.

[0034] The high-temperature cooling circuit includes a second main circuit for dissipating heat from the engine and a third sub-circuit connected in parallel to the second main circuit.

[0035] More specifically, the first main circuit includes a low-temperature radiator, an outlet pipe, and a return pipe. The low-temperature radiator, the electronic control unit, and the electromechanical coupling system in the first main circuit are connected in series through pipes. The first sub-circuit includes a condenser for dissipating heat from the power battery and the air conditioner evaporator. The water inlet end of the first sub-circuit is connected to the outlet pipe, and the water outlet end of the first sub-circuit is connected to the return pipe. In the first sub-circuit, the power battery radiator and the condenser are connected in series through pipes, and the air conditioner evaporator and the condenser are connected in series through pipes. The second sub-circuit includes an intercooler heat exchanger for dissipating heat from the engine and / or the turbine. The water inlet end of the second sub-circuit is connected to the outlet pipe, and the water outlet end of the second sub-circuit is connected to the return pipe. In the second sub-circuit, the intercooler heat exchanger and the engine are connected in series through pipes, and the intercooler heat exchanger and the turbine are connected in series through pipes. The second main circuit includes an engine radiator for dissipating heat from the engine. In the second main circuit, the engine and the engine radiator are connected in series through pipes. The third sub-circuit includes the heater core of the air conditioner. The water inlet end and the water outlet end of the third sub-circuit are both connected to the engine, that is, the heater core is connected to the engine through pipes. The third sub-circuit is connected in parallel to the second main circuit through the engine. Among them, the condenser can be a water-cooled condenser.

[0036] The low-temperature cooling circuit can operate in at least three modes:

[0037] When the first main circuit is operating, the coolant is cooled in the low-temperature radiator, flows out and then along the outlet pipe, and flows through the electronic control unit and the electromechanical coupling system to conduct heat exchange with the electronic control unit and the electromechanical coupling system to take away heat. After the heat exchange is completed, the coolant returns to the low-temperature radiator along the return pipe to be cooled again and flows out, continuing the above cycle.

[0038] When the first sub-circuit is operating, the coolant flowing out from the low-temperature radiator enters the first sub-circuit along the outlet pipe and exchanges heat with the coolant in the condenser in the condenser, reducing the temperature of the coolant in the condenser. The condenser is used to dissipate heat from the power battery and the evaporator of the air conditioner, and the heat is transferred from the power battery and the evaporator to the coolant in the condenser. After the heat exchange is completed, the coolant flows out of the first sub-circuit and returns to the low-temperature radiator along the return pipe to complete one cycle.

[0039] When the second sub-circuit is operating, the coolant flowing out from the low-temperature radiator enters the second sub-circuit along the outlet pipe and then enters the intercooler heat exchanger. The intercooler heat exchanger is used to dissipate heat from the turbine and the engine, reducing the intake air temperature of the engine. The high-temperature air exchanges heat with the coolant in the intercooler heat exchanger. After the heat exchange is completed, the coolant flows out of the second sub-circuit and returns to the low-temperature radiator along the return pipe to complete one cycle.

[0040] The high-temperature cooling circuit can operate in at least two working modes:

[0041] When the second main circuit operates, the coolant in the second main circuit flows out after being cooled in the engine radiator, enters the engine interior for heat exchange, and the coolant that has completed the heat exchange returns to the engine radiator for cooling again, continuing the above cycle.

[0042] When the third sub-circuit operates, the coolant flows out after being cooled in the engine radiator and enters the engine, then flows out of the engine and enters the third sub-circuit to exchange heat with the heater core. The coolant that has completed the heat exchange flows back into the engine from the third sub-circuit and continues to operate along the second main circuit. After receiving the heat from the coolant, the heater core generates heat and can heat the passenger compartment to increase the temperature of the passenger compartment.

[0043] In this embodiment, the thermal management system includes multiple control subsystems to ensure that the low-temperature cooling circuit and the corresponding sub-circuits can circulate normally, and to ensure that the high-temperature cooling circuit and the corresponding sub-circuits can circulate normally. The two main circuits are independent of each other.

[0044] From the working processes of the above-mentioned circuits, it can be seen that the thermal management system in this embodiment combines multiple circuits, mainly divided into a low-temperature cooling circuit and a high-temperature cooling circuit, and multiple sub-circuits are arranged in parallel within each main circuit. By controlling each sub-circuit, the corresponding thermal management can be achieved. Since multiple sub-circuits within the same main circuit share some structures, the structure of the thermal management system is streamlined as a whole, and the functionality is improved. The division of the two main circuits also takes into account the efficient utilization of energy. Therefore, it has the advantages of a more streamlined structure, stronger heat management functionality, and high energy consumption utilization rate. At the same time, due to the reduction of the structure, the space requirement for the in-cabin layout is reduced, not only saving space but also reducing the development and production costs.

[0045] Optionally, a plurality of control valves capable of adjusting the flow rate and / or changing the flow direction are provided on the first main circuit. The first sub-circuit and the second sub-circuit are connected to the first main circuit through the corresponding plurality of control valves, and the first sub-circuit and the second sub-circuit form a parallel relationship, and the opening and closing of the first sub-circuit and the second sub-circuit can be independently controlled through the corresponding control valves, and the coolant flow rate and flow direction of each circuit can be accurately controlled.

[0046] Optionally, the multiple control valves described above include a first three-way valve, a first reversing valve provided on the first water outlet pipeline, and a second three-way valve and a third three-way valve provided on the first water return pipeline; wherein, the water inlet end of the first sub-loop is connected to the first reversing valve, and the water outlet end is connected to the second three-way valve; the water inlet end of the second sub-loop is connected to the first three-way valve, and the water outlet end is connected to the third three-way valve. A three-way valve is a common valve body in the art that can control the flow ratio of the outlets. For example, a three-way valve with one inlet and two outlets can control the opening and closing of any one of the outlets to achieve the inflow or cut-off of the coolant in the corresponding sub-loop. A reversing valve can achieve the opening, switching, and reversing of the coolant flow and can control the relevant flow ratio. By setting the reversing valve and the three-way valve, the flow rate and flow direction of the coolant in each loop can be precisely controlled, thereby improving the accuracy of thermal management.

[0047] Optionally, a first water pump is provided between the third three-way valve and the low-temperature radiator to pressurize the entire first main loop and promote the movement of the coolant in the first main loop.

[0048] Optionally, in this embodiment, the first sub-loop includes an air-conditioning loop and a battery loop connected in parallel. The water inlet ends of the air-conditioning loop and the battery loop are connected to the water outlet end of the condenser, and the water outlet ends of the air-conditioning loop and the battery loop are connected to the water inlet end of the condenser; an evaporator and a first expansion valve are connected in series on the air-conditioning loop, and a power battery radiator and a second expansion valve are connected in series on the battery loop. The ratio of the coolant flowing into the evaporator and the power battery radiator is adjusted by the first expansion valve and the second expansion valve. The coolant flowing through the air-conditioning loop exchanges heat with the evaporator, and the coolant flowing through the power battery radiator exchanges heat with the power battery. The coolants that have completed heat exchange respectively converge and enter the condenser from the water outlet end. The condenser itself is connected to the first self-loop and has two channels inside. One channel is for the first coolant (lower temperature) flowing in from the first main loop to pass through, and the other channel is for the second coolant (higher temperature) flowing through the air-conditioning loop and the battery loop to pass through. After the two exchange heat, the first coolant flows into the water return pipeline, and the second coolant flows out and enters the water inlet ends of the air-conditioning loop and the battery loop to continue the next heat dissipation cycle.

[0049] Optionally, a compressor is provided between the water outlet ends of the air-conditioning loop and the battery loop and the condenser. Driven by the compressor, the second coolant flows through the water-cooled condenser for cooling, then passes through the air-conditioning evaporator and then returns to the compressor to reduce the temperature of the passenger compartment and achieve temperature adjustment of the passenger compartment.

[0050] Optionally, the third sub-circuit in this embodiment includes a thermal-sensitive circuit and a passage connected in parallel between the water inlet end of the third sub-circuit and the heater core. The thermal-sensitive circuit is provided with a thermistor, and the passage is a direct pipe connection, that is, there is a direct connection between the engine and the heater core through a pipe. When the engine temperature is not high, the coolant flowing out of the engine flows into the passage and directly enters the heater core to exchange heat with it, and then directly returns to the engine to cool the engine, and then flows back to the third water pump to complete the cycle; when heating is required in the passenger compartment, the coolant enters the thermal-sensitive circuit, and the thermistor heats the coolant flowing out of the engine. The heated coolant flows into the heater core, and the heater core introduces the heat into the passenger compartment to increase the temperature of the passenger compartment, and then the coolant returns to the engine to cool the engine.

[0051] Optionally, a second reversing valve for controlling the flow rate ratio of the thermal-sensitive circuit and the passage is provided at the water inlet end of the third sub-circuit. The second reversing valve can control the third sub-circuit to realize the opening and closing or the flow rate ratio of the thermal-sensitive circuit and the passage.

[0052] Optionally, a second water pump is provided on the second main circuit, and a third water pump is provided on the pressurization circuit. The second water pump is used to pressurize the entire second main circuit to drive the coolant to move in the second main circuit. The second water pump is used to pressurize the third sub-circuit to drive the coolant to move in the third sub-circuit.

[0053] Optionally, the thermal management system further includes a first cooling device connected to the first main circuit and a second cooling device connected to the second main circuit. The first cooling device can directly exchange heat with the coolant in the first main circuit. When the temperature of the coolant in the first main circuit is too high and exceeds the heat dissipation limit value in the low-temperature radiator, it exchanges heat with the normal-temperature coolant of the first cooling device to quickly reduce the temperature of the coolant in the first circuit as a supplement to heat dissipation. The second cooling device acts on the second main circuit, and its function is the same as that of the first cooling device, so it will not be elaborated. The cooling device can be a water kettle, that is, the management system further includes a first water kettle connected to the first main circuit and a second water kettle connected to the second main circuit. Using a coolant with better fluidity as the coolant increases the coolant circulation efficiency in the thermal management system and further reduces the cost.

[0054] This embodiment also provides a vehicle, which is a hybrid vehicle including the above thermal management system.

[0055] The working principle of the thermal management system in this embodiment:

[0056] Low-temperature cooling circuit: The first water pump drives the coolant in the first main circuit into the low-temperature radiator. After being cooled by the low-temperature radiator, the coolant passes through the first three-way valve. Part of the coolant passing through the first three-way valve enters the first reversing valve, and part enters the intercooling heat exchanger through the first reversing valve; for the coolant entering the first reversing valve, under the control of the first reversing valve, part of the coolant cools the electronic control unit and the electromechanical coupling system. After cooling, the high-temperature coolant passes through the second three-way valve, then flows through the third three-way valve and the first water pump, and finally enters the low-temperature radiator again to complete the cycle; under the control of the first reversing valve, another part of the coolant flows into the water-cooled condenser, exchanges heat with the second coolant in the air-conditioning circuit inside the water-cooled condenser, and after heat exchange, the coolant passes through the second three-way valve, then flows through the third three-way valve, and flows into the first water pump to enter the low-temperature radiator again to complete the cycle; the coolant entering the intercooling heat exchanger exchanges heat with the engine intake air in the intercooling heat exchanger to reduce the intake air temperature of the engine. After heat exchange, the coolant passes through the third three-way valve, flows into the first water pump and enters the low-temperature radiator again to complete the cycle. In addition, when the coolant temperature in the first main circuit is too high, part of the coolant will exchange heat and cool down through the first cooling device to prevent the coolant temperature from being too high.

[0057] Meanwhile, driven by the compressor, the second coolant flows through the water-cooled condenser. After the second coolant is cooled, part of the second coolant passes through the first expansion valve, then through the air-conditioning evaporator, and returns to the compressor to reduce the temperature of the passenger compartment; another part of the second coolant passes through the second expansion valve, then through the power battery radiator, and returns to the compressor to reduce the temperature of the power battery.

[0058] High-temperature cooling circuit: The second water pump drives the third coolant in the second main circuit into the engine. After the third coolant is heated by the engine intake air, it exchanges heat with the engine radiator, and the heat-exchanged third coolant flows back into the second water pump to complete the cycle. Among them, the second reversing valve controls the flow ratio of the inflow path and the PTC thermistor. When the engine water temperature is not high, the third water pump drives the third coolant to flow through the path and through the heater core, and then directly returns to the engine to cool the engine, and then flows back to the third water pump through the second reversing valve to complete the cycle; when heating is required in the passenger compartment, the PTC thermistor on the thermistor circuit heats the third coolant. The third water pump drives the heated third coolant to flow through the heater core, and the heater core introduces heat into the passenger compartment to adjust the temperature of the passenger compartment. Then the third coolant returns to the engine to cool the engine, and then flows back to the third water pump and the PTC thermistor through the second reversing valve to complete the cycle.

[0059] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A thermal management system, characterized in that, comprising: A first main circuit for dissipating heat from the electronic control unit and the electromechanical coupling system, the first main circuit including a low-temperature radiator and an outlet pipeline and a return pipeline; A first sub-circuit, the first sub-circuit including a condenser for dissipating heat from the power battery and the air conditioner evaporator, the inlet end of the first sub-circuit being connected to the outlet pipeline, and the outlet end of the first sub-circuit being connected to the return pipeline; A second sub-circuit, the second sub-circuit including an intercooler heat exchanger for heat dissipation, the inlet end of the second sub-circuit being connected to the outlet pipeline, and the outlet end of the second sub-circuit being connected to the return pipeline; A second main circuit, the second main circuit including an engine radiator for dissipating heat from the engine; A third sub-circuit, the third sub-circuit including a heater core of the air conditioner, the inlet end and the outlet end of the third sub-circuit both being connected to the engine; When the first main circuit operates, the coolant is cooled in the low-temperature radiator, flows out and then flows along the outlet pipeline, and flows through the electronic control unit and the electromechanical coupling system to perform heat exchange with the electronic control unit and the electromechanical coupling system to take away heat; When the first sub-circuit operates, the coolant flowing out of the low-temperature radiator enters the first sub-circuit along the outlet pipeline, exchanges heat with the coolant in the condenser, and the coolant after heat exchange flows out of the first sub-circuit and returns to the low-temperature radiator along the return pipeline; When the second sub-circuit operates, the coolant flowing out of the low-temperature radiator enters the intercooler heat exchanger of the second sub-circuit along the outlet pipeline, and the high-temperature air exchanges heat with the coolant in the intercooler heat exchanger. The coolant after heat exchange flows out of the second sub-circuit and returns to the low-temperature radiator along the return pipeline; When the second main circuit operates, the coolant of the second main circuit flows out after being cooled in the engine radiator, enters the engine interior for heat exchange, and the coolant after heat exchange returns to the engine radiator to be cooled again; When the third sub-circuit operates, the coolant flows out after being cooled in the engine radiator, enters the engine, and flows out of the engine into the third sub-circuit to exchange heat with the heater core. The coolant after heat exchange flows back into the engine from the third sub-circuit and operates along the second main circuit.

2. The thermal management system according to claim 1, characterized in that, A plurality of control valves capable of adjusting the flow rate and / or changing the flow direction are provided on the first main circuit. The first sub-circuit and the second sub-circuit are connected to the first main circuit through the corresponding plurality of control valves, and the first sub-circuit and the second sub-circuit form a parallel relationship.

3. The thermal management system according to claim 2, characterized in that, The multiple control valves include a first three-way valve, a first reversing valve disposed on the outlet water pipeline, a second three-way valve, and a third three-way valve disposed on the return water pipeline; the water inlet end of the first sub-loop is connected to the first reversing valve, and the water outlet end of the first sub-loop is connected to the second three-way valve; the water inlet end of the second sub-loop is connected to the first three-way valve, and the water outlet end of the second sub-loop is connected to the third three-way valve.

4. The thermal management system according to claim 3, wherein, a first water pump is provided between the third three-way valve and the low-temperature radiator, a second water pump is provided on the second main loop, and a third water pump is provided on the water inlet end of the third sub-loop.

5. The thermal management system according to claim 1, wherein, the first sub-loop further includes an air-conditioning loop and a battery loop that are connected in parallel with each other. The water inlet ends of the air-conditioning loop and the battery loop are connected to the water outlet end of the condenser, and the water outlet ends of the air-conditioning loop and the battery loop are connected to the water inlet end of the condenser; an evaporator and a first expansion valve are connected in series on the air-conditioning loop, and a power battery radiator and a second expansion valve are connected in series on the battery loop.

6. The thermal management system according to claim 5, wherein, a compressor is provided between the water outlet ends of the air-conditioning loop and the battery loop and the condenser.

7. The thermal management system according to claim 1, wherein, the third sub-loop includes a thermal-sensitive loop and a passage that are connected in parallel between the water inlet end of the third sub-loop and the heater core. The thermal-sensitive loop is provided with a thermistor, and the passage is a direct pipeline connection.

8. The thermal management system according to claim 7, wherein, a second reversing valve for controlling the flow rate ratio of the thermal-sensitive loop and the passage is provided at the water inlet end of the third sub-loop.

9. The thermal management system according to any one of claims 1-8, wherein, the thermal management system further includes a first cooling device connected to the first main loop and a second cooling device connected to the second main loop.

10. A vehicle, wherein, it includes the thermal management system according to any one of claims 1-9.

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