CN115366609A - Thermal management system, vehicle and control method of thermal management system - Google Patents

Abstract

The application discloses a thermal management system, a vehicle and a control method of the thermal management system. Thermal management systems are used in vehicles. The thermal management system includes a first circuit, a second circuit, a power battery and a mixing chamber. The first circuit is used to heat the cockpit of the vehicle. The power battery is set in the second loop. The mixing chamber is respectively connected to the first circuit and the second circuit, and mixes the coolant in the first circuit and the second circuit. The coolant in the thermal management system flows to the first circuit and the second circuit respectively, part of the coolant passes through the first circuit to provide heat for the cockpit of the vehicle, and the other part of the coolant enters the mixing chamber to mix with the coolant in the second circuit and passes through the The secondary circuit flows to the power battery, so that the temperature of the coolant in the second circuit is suitable for heating and insulating the power battery.

Description

Thermal management system, vehicle and control method for thermal management system

technical field

The present application relates to the field of vehicle technology, and more specifically, to a thermal management system, a vehicle and a control method for the thermal management system.

Background technique

In related technologies, the battery of a car needs to be kept at a relatively suitable temperature in order to maintain good performance. When the battery temperature is too low, it is necessary to heat the battery with hot water, and the coolant in the battery absorbs the heat of the high-temperature loop coolant in a conductive manner by means of a water-to-water heat exchanger, thereby heating the battery coolant. However, such a solution increases the cost of the water-to-water heat exchanger, and at the same time transfers heat through the water-to-water heat exchanger, resulting in slow heat transfer response and low heat transfer efficiency.

Contents of the invention

Embodiments of the present application provide a thermal management system, a vehicle, and a control method for the thermal management system.

The heat management system of the embodiment of the present application is used for a vehicle. The thermal management system includes a first circuit, a second circuit, a power battery and a mixing chamber. The first circuit is used to heat the cockpit of the vehicle. The power battery is arranged in the second circuit. The mixing chamber is respectively connected to the first circuit and the second circuit, and mixes the coolant in the first circuit and the second circuit.

In the thermal management system according to the embodiment of the present application, the thermal management system is used in a vehicle, and the cooling liquid in the thermal management system flows to the first circuit and the second circuit respectively, and part of the cooling liquid supplies heat to the cockpit of the vehicle through the first circuit. Another part of the cooling liquid enters the mixing chamber and mixes with the cooling liquid of the second circuit, and then flows to the power battery through the second circuit, so that the temperature of the cooling liquid of the second circuit is suitable for heating and insulating the power battery.

In some embodiments, the first circuit includes a main circuit, a branch circuit and a valve assembly, the main circuit is used for heating the cockpit, and the mixing chamber is connected to the branch circuit and the second circuit respectively. In the second circuit, the valve assembly is used to communicate with the main circuit and the branch circuit, and regulate the flow of cooling liquid to the main circuit and the branch circuit respectively.

In some embodiments, the valve assembly is a three-way valve, and the three-way valve includes a first interface, a second interface and a third interface, the first interface is connected to the water inlet pipeline, and the second interface is connected to The main circuit, the third interface is connected to the branch circuit.

In some embodiments, the thermal management system further includes a three-way pipe fitting, and the three-way pipe fitting is respectively connected to the back ends of the main circuit, the branch circuit and the return water pipeline.

In some embodiments, the valve assembly is capable of controlling the proportion of coolant flowing into the primary circuit and the secondary circuit.

In some embodiments, the thermal management system further includes a temperature sensor, the temperature sensor is used to detect the temperature of the coolant flowing to the power battery in the second circuit, and the valve assembly can The temperature detected by the sensor adjusts the ratio of coolant flowing into the main circuit and the branch circuit.

In some embodiments, the thermal management system further includes a warm air core, the warm air core is arranged in the main circuit, and the warm air core is used for heating the cockpit of the vehicle.

In some embodiments, the mixing chamber includes a first mixing interface, a second mixing interface, a third mixing interface and a fourth mixing interface, the first mixing interface and the second mixing interface are connected to the second loop, the third hybrid interface and the fourth hybrid interface are connected to the first loop.

In some embodiments, the thermal management system further includes a pump body, the pump body is arranged in the second circuit, and the pump body is used to drive the cooling liquid to flow in the second circuit.

The vehicle according to the embodiments of the present application includes a vehicle body and the thermal management system described in any one of the above embodiments, where the thermal management system is arranged on the vehicle body.

The control method of the thermal management system in the embodiment of the present application includes:

Reading the temperature value of the temperature sensor arranged in the second loop of the thermal management system, the temperature sensor is used to detect the temperature of the coolant flowing to the power battery arranged in the second loop in the second loop;

When the temperature value is lower than the predetermined temperature value, adjust the valve assembly provided in the first circuit of the thermal management system to increase the flow of cooling liquid entering the branch circuit of the first circuit, the branch circuit communicate with the second circuit through the mixing chamber;

When the temperature value is higher than the predetermined temperature value, the valve assembly is adjusted to reduce the flow of coolant entering the branch circuit.

In the thermal management system, the vehicle and the control method of the thermal management system in the embodiments of the present application, the thermal management system is used for the vehicle, the cooling liquid in the thermal management system flows to the first circuit and the second circuit respectively, and part of the cooling liquid passes through the first The circuit supplies heat to the cockpit of the vehicle, and another part of the coolant enters the mixing chamber to mix with the coolant in the second circuit and then flows to the power battery through the second circuit, so that the temperature of the coolant in the second circuit is suitable for heating and heat preservation of the power battery .

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic structural diagram of a thermal management system according to an embodiment of the present application;

Fig. 2 is a schematic structural view of a vehicle according to an embodiment of the present application;

Fig. 3 is another structural schematic diagram of the thermal management system according to the embodiment of the present application;

Fig. 4 is another structural schematic diagram of the thermal management system according to the embodiment of the present application;

5 is a schematic diagram of a module structure of a thermal management system according to an embodiment of the present application;

FIG. 6 is a schematic flowchart of a control method of a thermal management system according to an embodiment of the present application.

Description of main component symbols:

thermal management system 100,

Processor 101, first circuit 10, main circuit 11, branch circuit 12, valve assembly 13, first interface 131, second interface 132, third interface 133, water inlet pipeline 14, return water pipeline 15, second circuit 20 , power battery 30, mixing chamber 40, first mixing interface 41, second mixing interface 42, third mixing interface 43, fourth mixing interface 44, tee pipe fitting 50, temperature sensor 60, warm air core 70, pump body 80. Vehicle 200, body 201.

Detailed ways

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, are only for explaining the present application, and should not be construed as limiting the present application.

In this application, unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The following disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are examples only and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or reference letters in various instances, such repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

Referring to FIG. 1 and FIG. 2 , the thermal management system 100 according to the embodiment of the present application is used in a vehicle 200 . The thermal management system 100 includes a first loop 10 , a second loop 20 , a power battery 30 and a mixing chamber 40 . The first circuit 10 serves to heat the cabin of the vehicle 200 . The power battery 30 is arranged in the second circuit 20 . The mixing chamber 40 is respectively connected to the first circuit 10 and the second circuit 20 , and mixes the coolant in the first circuit 10 and the second circuit 20 .

In the thermal management system 100 of the embodiment of the present application, the thermal management system 100 is used in a vehicle 200, the cooling liquid in the thermal management system 100 flows to the first circuit 10 and the second circuit 20 respectively, and part of the cooling liquid passes through the first circuit 10 for The cockpit of the vehicle 200 is heated, and another part of the coolant enters the mixing chamber 40 to mix with the coolant of the second circuit 20 and then flows to the power battery 30 through the second circuit 20, so that the temperature of the coolant in the second circuit 20 is suitable for power consumption. The battery 30 is heated and kept warm.

It can be understood that the thermal management system 100 of the vehicle 200 may include multiple sets of pipelines to achieve different heating and cooling functions. For example, the vehicle 200 can supply heat to the cockpit and the power battery 30 through multiple pipeline systems, so as to ensure the indoor temperature of the cockpit and the normal operation of the power battery 30 .

Specifically, in the thermal management system 100 of the embodiment of the present application, the cooling fluid used to heat the power battery 30 needs to be lower than 40°C, while the temperature of the cooling fluid used to heat the passenger compartment needs to be higher than 60°C, that is, Say that the temperature of the cooling liquid in the first circuit 10 is higher than the temperature of the cooling liquid in the second circuit 20 . It can be understood that after the cooling liquid circulates for a period of time, the temperature of the cooling liquid will drop. At this time, the mixing chamber 40 can be opened to make the cooling liquid in the first circuit 10 and the second circuit 20 mix and return to the first circuit respectively. 10 and the second loop 20. In this way, the temperature of the cooling liquid returned to the first circuit 10 drops slightly, and the temperature of the cooling liquid in the first circuit 10 can be recovered through elements such as the compressor and the outdoor heat exchanger. The temperature of the cooling liquid returned to the second circuit 20 rises, so that the temperature of the cooling liquid in the second circuit 20 is suitable, and then the power battery 30 is heated and kept warm. Of course, the mixing chamber 40 can also be opened at the beginning, so that the cooling liquids of the first circuit 10 and the second circuit 20 are always within a proper range.

Further, in the thermal management system 100 of the embodiment of the present application, the first circuit 10 and the second circuit 20 are connected through the mixing chamber 40, so that the coolant with a higher temperature in the first circuit 10 can be mixed with the second circuit 20 The coolant with a lower temperature is mixed to ensure that the temperature of the coolant in the second circuit 20 is appropriate. It avoids the cost of increasing the water-to-water heat exchanger or heater in the second circuit 20 in the related art, simplifies the original pipeline system, and directly mixes the cooling liquid together, so that the response of heat transfer is fast and the transfer efficiency is high. high.

Referring to Fig. 1, in some embodiments, the first circuit 10 includes a main circuit 11, a branch circuit 12 and a valve assembly 13, the main circuit 11 is used for heating the cockpit, and the mixing chamber 40 is connected to the branch circuit 12 and the second circuit respectively. The secondary circuit 20 and the valve assembly 13 are used to communicate with the main circuit 11 and the branch circuit 12, and regulate the flow of cooling liquid to the main circuit 11 and the branch circuit 12 respectively.

In this way, the coolant in the first circuit 10 flows to the main circuit 11 and the branch circuit 12 respectively through the valve assembly 13, so that part of the coolant can be diverted to the main circuit 11 to heat the cockpit, and part of the coolant can be diverted to the branch circuit 12, The cooling liquid entering the branch circuit 12 can be mixed with the cooling liquid in the second circuit 20 through the mixing chamber 40 and returned to the second circuit 20 , and then the temperature of the cooling liquid in the second circuit 20 is suitable to heat and keep the power battery 30 warm.

It can be understood that the two circuits of the thermal management system 100 are often located in different positions of the vehicle 200, the first circuit 10 can be divided into a main circuit 11 and a branch circuit 12, and the branch circuit 12 can extend to a position near the second circuit 20 And communicate with the mixing chamber 40 . The valve assembly 13 can divide the cooling liquid into two parts, one part of the cooling liquid can pass through the main circuit 11 to provide heat for the cockpit, and the other part of the cooling liquid can enter the mixing chamber 40 through the branch circuit 12 .

Please refer to FIG. 1 , in some embodiments, the valve assembly 13 is a three-way valve, and the three-way valve includes a first port 131, a second port 132 and a third port 133, the first port 131 is connected to the water inlet pipeline 14, and the first port 131 is connected to the water inlet pipeline 14. The second interface 132 is connected to the main circuit 11 , and the third interface 133 is connected to the branch circuit 12 .

In this way, the coolant in the water inlet pipeline 14 enters the three-way valve through the first interface 131, and then is divided into the main circuit 11 and the branch circuit 12 through the second interface 132 and the third interface 133 respectively, so as to ensure that the coolant in the water inlet pipeline 14 can be The shunt realizes two functions of heating the power battery 30 and heating the cockpit.

In the embodiment of the present application, the specific type of the valve assembly 13 is not limited, and the valve assembly 13 may also be a four-way valve or a five-way valve to meet different requirements.

Further, referring to FIG. 1 , in some embodiments, the thermal management system 100 further includes a three-way pipe fitting 50 , which connects the rear ends of the main circuit 11 and the branch circuit 12 and the return water pipeline 15 respectively.

In this way, the three-way pipe fitting 50 is connected to the main circuit 11, the branch circuit 12 and the return pipe 15 at the same time, so that the coolant can flow out through the return pipe 15 after passing through the main circuit 11 and the branch circuit 12, ensuring that the coolant is in the entire pipeline circulation.

Specifically, the three-way pipe fitting 50 and the valve assembly 13 are respectively arranged at both ends of the main circuit 11 and the branch circuit 12, so that the main circuit 11 and the branch circuit 12 can form a complete pipeline system with the water inlet pipeline 14 and the return water pipeline 15 , to ensure that the coolant can achieve a complete cycle. In addition, in some embodiments, the three-way pipe fitting 50 can also be replaced by a three-way valve, so that the two three-way valves together control the circulation of the main circuit 11 and the branch circuit 12 of the cooling liquid.

Please refer to FIG. 1 , in some embodiments, the thermal management system 100 further includes a warm air core 70 , the warm air core 70 is arranged in the main circuit 11 , and the warm air core 70 is used for heating the cockpit of the vehicle 200 .

In this way, the warm air core 70 is arranged on the main circuit 11 , so that when the coolant passes through the main circuit 11 , it supplies heat to the cockpit through the warm air core 70 .

In such an embodiment, the coolant in the water inlet pipeline 14 enters the main circuit 11 and the branch circuit 12 through the valve assembly 13 respectively, so that the coolant entering the main circuit 11 can heat the cockpit through the heater core 70 , the cooling liquid entering the branch circuit 12 may enter the mixing chamber 40 so that the temperature of the cooling liquid in the second circuit 20 increases.

Please refer to FIG. 3 and FIG. 4 , in other embodiments, the warm air core 70 can also be arranged in the water inlet pipeline 14 or the water return pipeline 15 in the first circuit 10 . In one example, when the warm air core 70 is arranged in the water inlet pipeline 14 , the coolant passes through the warm air core 70 to heat the cockpit and then enters the mixing chamber 40 through the first circuit 10 . In this way, the temperature of the cooling liquid in the first circuit 10 drops slightly, and can still heat the power battery 30 after being mixed with the cooling liquid in the second circuit 20 . In another example, when the warm air core 70 is arranged in the return water pipeline 15 , the coolant first enters the mixing chamber 40 and then enters the warm air core 70 . Of course, in such an embodiment, the valve assembly 13 and the tee pipe 50 can be omitted, and only one pipeline remains.

Referring to FIG. 1 , in some embodiments, the valve assembly 13 is capable of controlling the proportion of coolant flowing into the main circuit 11 and the branch circuit 12 .

In this way, the coolant in the water inlet line 14 can be flowed into the main circuit 11 and the branch circuit 12 by the valve assembly 13 according to a certain ratio, so as to ensure that the coolant can realize the corresponding function. The temperature changes the ratio of entering the main circuit 11 and the branch circuit 12 to adjust the temperature of the power battery 30 and the cockpit accordingly.

Further, please refer to FIG. 1 and FIG. 5 , in some embodiments, the thermal management system 100 further includes a temperature sensor 60, the temperature sensor 60 is used to detect the temperature of the coolant flowing to the power battery 30 in the second circuit 20, and the valve The component 13 can adjust the proportion of the coolant flowing into the main circuit 11 and the branch circuit 12 according to the temperature detected by the temperature sensor 60 .

In this way, the temperature sensor 60 can detect the temperature of the coolant flowing to the power battery 30 in the second circuit 20 , and then adjust the ratio of the coolant flowing into the main circuit 11 and the branch circuit 12 according to the detected temperature value, so as to quickly adjust the power battery 30 temperature.

Specifically, the thermal management system 100 further includes a processor 101 , the processor 101 can be connected to the temperature sensor 60 and the valve assembly 13 , receives a temperature signal from the temperature sensor 60 and controls the valve assembly 13 . In one example, when the temperature sensor 60 detects that the temperature of the coolant flowing to the power battery 30 in the second circuit 20 is lower than a predetermined temperature range, the processor 101 receives a temperature signal from the temperature sensor 60, and the processor 101 controls the valve assembly 13 makes the valve assembly 13 change the ratio of coolant flowing into the main circuit 11 and the branch circuit 12, and the ratio of the coolant entering the branch circuit 12 is increased, thereby rapidly increasing the temperature of the coolant in the second circuit 20 to ensure the normal operation of the power battery 30. In another example, when the temperature sensor 60 detects that the temperature of the coolant flowing to the power battery 30 in the second circuit 20 is higher than a predetermined temperature range, the processor 101 receives a temperature signal from the temperature sensor 60, and the processor 101 controls the valve The component 13 makes the valve component 13 change the ratio of the coolant flowing into the main circuit 11 and the branch circuit 12, and the ratio of the coolant entering the branch circuit 12 is reduced, thereby ensuring the normal temperature of the coolant in the second circuit 20 and ensuring the stable operation of the power battery 30 .

Referring to Fig. 1, in some embodiments, the mixing chamber 40 includes a first mixing interface 41, a second mixing interface 42, a third mixing interface 43 and a fourth mixing interface 44, the first mixing interface 41 and the second mixing interface 42 is connected to the second loop 20 , and the third mixing interface 43 and the fourth mixing interface 44 are connected to the first loop 10 .

In this way, the cooling liquid of the second circuit 20 can enter the mixing chamber 40 through the first mixing interface 41, and the cooling liquid of the first circuit 10 can enter the mixing chamber 40 through the third mixing interface 43, and the cooling liquid of the two temperatures is mixed chamber 40 to adjust the temperature of the coolant. The cooling liquid in the mixing chamber 40 can return to the second circuit 20 and the first circuit 10 through the second mixing interface 42 and the fourth mixing interface 44 respectively, so that the temperature of the cooling liquid flowing to the power battery 30 is suitable, and the cooling of the power battery 30 is realized. Quickly heats up and keeps warm.

Please refer to FIG. 1 , in some embodiments, the thermal management system 100 further includes a pump body 80 , the pump body 80 is disposed in the second circuit 20 , and the pump body 80 is used to drive the cooling liquid to flow in the second circuit 20 .

In this way, the pump body 80 can provide pressure for the second circuit 20, drive the flow of the coolant in the second circuit 20, avoid slow flow or even blockage of the coolant in the second circuit 20, and ensure that the coolant can flow quickly in the second circuit 20 The flow realizes the heating and heat preservation of the power battery 30 .

Referring to FIG. 2 , a vehicle 200 according to an embodiment of the present application includes a vehicle body 201 and a thermal management system 100 according to any one of the above embodiments, and the thermal management system 100 is arranged on the vehicle body 201 .

In the thermal management system 100 and the vehicle 200 in the embodiment of the present application, the thermal management system 100 is used in the vehicle 200, the cooling liquid in the thermal management system 100 flows to the first circuit 10 and the second circuit 20 respectively, and part of the cooling liquid passes through the first The circuit 10 supplies heat to the cockpit of the vehicle 200, and another part of the coolant enters the mixing chamber 40 and mixes with the coolant of the second circuit 20, and then flows to the power battery 30 through the second circuit 20, so that the temperature of the coolant in the second circuit 20 is suitable. To heat and keep the power battery 30 warm.

In the embodiment of the present application, the specific type of the vehicle 200 is not limited, and the vehicle 200 may be a hybrid vehicle or a pure electric vehicle to meet different requirements.

Referring to FIG. 5 and FIG. 6, the control method of the thermal management system 100 in the embodiment of the present application includes:

S10, read the temperature value of the temperature sensor 60 arranged in the second circuit 20 of the thermal management system 100, the temperature sensor 60 is used to detect the temperature of the coolant flowing to the power battery 30 arranged in the second circuit 20 in the second circuit 20 ;

S20, when the temperature value is lower than the predetermined temperature value, adjust the valve assembly 13 provided in the first circuit 10 of the thermal management system 100 to increase the flow rate of the coolant entering the branch circuit 12 of the first circuit 10, the branch circuit 12 and the second circuit The secondary circuit 20 communicates through the mixing chamber 40;

S30, when the temperature value is higher than the predetermined temperature value, adjust the valve assembly 13 to reduce the flow rate of the coolant entering the branch circuit 12 .

In some implementations, the thermal management system 100 further includes a processor 101. The processor 101 can be used to read the temperature value of the temperature sensor 60 provided in the second loop 20 of the thermal management system 100. The temperature sensor 60 is used to detect the first The temperature of the coolant flowing to the power battery 30 arranged in the second circuit 20 in the secondary circuit 20; and for adjusting the valve assembly 13 provided in the first circuit 10 of the thermal management system 100 when the temperature value is lower than a predetermined temperature value To increase the flow rate of coolant entering the branch circuit 12 of the first circuit 10, the branch circuit 12 and the second circuit 20 communicate through the mixing chamber 40; it is also used to adjust the valve assembly 13 to reduce the temperature value when the temperature value is higher than the predetermined temperature value. The flow rate of coolant entering the branch circuit 12.

In the thermal management system 100, the vehicle 200 and the control method of the thermal management system 100 in the embodiment of the present application, the thermal management system 100 is used for the vehicle 200, and the coolant in the thermal management system 100 flows to the first circuit 10 and the second circuit respectively 20, part of the coolant passes through the first circuit 10 to heat the cockpit of the vehicle 200, and another part of the coolant enters the mixing chamber 40 to mix with the coolant in the second circuit 20 and then flows to the power battery 30 through the second circuit 20, so that the second The temperature of the coolant in the circuit 20 is suitable for heating and keeping the power battery 30 warm.

In the description of the embodiments of the present application, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specifically defined.

In the description of this specification, reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples", or "some examples" etc. The specific features, structures, materials, or characteristics described in the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Although the implementation of the present application has been shown and described above, it can be understood that the above-mentioned implementation is exemplary and should not be construed as limiting the application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (11)

1. A thermal management system for a vehicle, comprising: a first circuit for heating the cabin of the vehicle; second circuit; a power battery, the power battery is arranged in the second loop; and A mixing chamber, the mixing chamber is respectively connected to the first circuit and the second circuit, and mixes the cooling liquid in the first circuit and the second circuit. 2. The thermal management system according to claim 1, wherein the first circuit comprises a main circuit, a branch circuit and a valve assembly, the main circuit is used for heating the cockpit, and the mixing chamber The branch circuit and the second circuit are respectively connected, and the valve assembly is used to communicate with the main circuit and the branch circuit, and regulate the flow of cooling liquid to the main circuit and the branch circuit respectively. 3. The thermal management system according to claim 2, wherein the valve assembly is a three-way valve, the three-way valve includes a first port, a second port and a third port, the first port is connected to In the water inlet pipeline, the second interface is connected to the main circuit, and the third interface is connected to the branch circuit. 4. The thermal management system according to claim 2, characterized in that the thermal management system further comprises a three-way pipe fitting, and the three-way pipe fitting is respectively connected to the rear end of the main circuit and the branch circuit and the return pipe road. 5. The thermal management system according to claim 2, wherein the valve assembly is capable of controlling the proportion of coolant flowing into the main circuit and the branch circuit. 6. The thermal management system according to claim 2, characterized in that the thermal management system further comprises a temperature sensor, the temperature sensor is used to detect the temperature of the coolant flowing to the power battery in the second circuit , the valve assembly is capable of adjusting the proportion of coolant flowing into the main circuit and the branch circuit according to the temperature detected by the temperature sensor. 7. The thermal management system according to claim 2, characterized in that, the thermal management system further comprises a warm air core, the warm air core is arranged in the main circuit, and the warm air core is used for Provides heating for the cockpit of the vehicle. 8. The thermal management system according to claim 1, wherein the mixing chamber comprises a first mixing interface, a second mixing interface, a third mixing interface and a fourth mixing interface, the first mixing interface and the The second hybrid interface is connected to the second circuit, and the third hybrid interface and the fourth hybrid interface are connected to the first circuit. 9. The thermal management system according to claim 1, characterized in that the thermal management system further comprises a pump body, the pump body is arranged in the second circuit, and the pump body is used to drive the cooling liquid in the flow in the second circuit. 10. A vehicle, characterized in that it comprises: bodywork; and According to the thermal management system according to any one of claims 1-9, the thermal management system is arranged on the vehicle body. 11. A control method for a thermal management system, comprising: Reading the temperature value of the temperature sensor arranged in the second loop of the thermal management system, the temperature sensor is used to detect the temperature of the coolant flowing to the power battery arranged in the second loop in the second loop; When the temperature value is lower than the predetermined temperature value, adjust the valve assembly provided in the first circuit of the thermal management system to increase the flow of cooling liquid entering the branch circuit of the first circuit, the branch circuit communicate with the second circuit through the mixing chamber; When the temperature value is higher than the predetermined temperature value, the valve assembly is adjusted to reduce the flow of coolant entering the branch circuit.

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