Vehicle thermal management system and use method

Abstract

The present invention discloses a vehicle-mounted thermal management system and a method of using the same, and relates to the technical field of vehicle-mounted thermal management, including a battery pack, wherein a cavity is provided in the battery pack, a bottom plate is fixedly connected to the bottom side of the cavity, a plurality of grooves are evenly provided on the upper side of the bottom plate, unit batteries are fixedly connected in the grooves, a first circuit is provided in the bottom plate, an input end of the first circuit passes through a pipeline on the right side of the battery pack cavity wall and is connected to a liquid pump, an output end of the first circuit passes through a pipeline on the right side of the battery pack cavity wall and is connected to the input end of the liquid pump, cooling plates are fixedly connected at four sides of the groove, a second circuit is provided in the cooling plate, an input end and an output end of the second circuit both pass through a pipeline on the cooling plate and are connected to the first circuit, a temperature control valve is fixedly connected to the pipeline connecting the input end and the output end of the first circuit to the second circuit, and the present invention has the characteristics of improving battery service time and performance.

Description

Technical Field

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

[0002] New energy electric vehicles refer to vehicles that use onboard power as power and use motors to drive wheels. As the core component of pure electric vehicles, the performance of power batteries will directly affect the overall performance of pure electric vehicles. In order to meet the requirements of electric vehicle range and achieve the predetermined voltage and capacity, multiple carp-ion batteries need to be connected in series and parallel to form power battery modules. A certain number of modules are connected in series to form a loop.

[0003] As the battery cells heat up during battery operation, when the temperature is too high, the battery capacity will decay, thermal runaway will occur, and driving risks will increase. When the temperature is too low, the battery capacity and performance will also decay. Therefore, when the temperature is too low, heating or insulation is required. Therefore, a vehicle thermal management system and method of use that can improve battery life and performance are very necessary. Summary of the invention

[0004] The object of the present invention is to provide a vehicle thermal management system and a method of use to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an on-vehicle thermal management system, comprising a battery pack, wherein a cavity is provided in the battery pack, a bottom plate is fixedly connected to the bottom side of the cavity, a plurality of grooves are evenly provided on the upper side of the bottom plate, and unit batteries are fixedly connected in the grooves;

[0006] A first circuit is provided in the bottom plate, the input end of the first circuit passes through a pipeline on the right side of the battery pack cavity wall and is connected to a liquid pump, and the output end of the first circuit passes through a pipeline on the right side of the battery pack cavity wall and is connected to the input end of the liquid pump;

[0007] The four sides of the groove are fixedly connected with cooling plates, a second circuit is opened in the cooling plate, the input end and the output end of the second circuit are connected to the first circuit through the cooling plate pipeline, and the pipes connecting the input end and the output end of the first circuit to the second circuit are fixedly connected with a temperature control valve;

[0008] A heat exchanger 1 is fixedly connected to a pipe on one side of the liquid pump input end, a refrigerant pipeline is arranged on the right side of the heat exchanger 1, and the heat exchanger 1 is fixedly connected to the refrigerant pipeline;

[0009] A heat exchanger 2 is arranged on one side of the input end of the heat exchanger 1, and the heat exchanger 2 is fixedly connected to the pipeline on one side of the liquid pump input end. A heat medium pipeline is arranged on the right side of the heat exchanger 2, and the heat exchanger 2 is fixedly connected to the heat medium pipeline. A temperature sensor 1 is fixedly connected to the pipeline on one side of the liquid pump output end.

[0010] According to the above technical solution, the refrigerant pipeline includes a connecting pipe 1, on which a compressor 1, a flow regulating valve 1, a condenser 1, and an expansion valve 1 are fixedly connected in sequence.

[0011] According to the above technical solution, the heat medium pipeline includes a second connecting pipe, to which a second compressor, a second flow regulating valve, a second expansion valve, and an evaporator are fixedly connected in sequence.

[0012] According to the above technical solution, a second condenser is connected in parallel to the heat medium pipeline, and both ends of the second heat exchanger are fixedly connected with electric control valves.

[0013] According to the above technical solution, blower 1 is provided on one side of condenser 1 and condenser 2, and blower 2 is provided on one side of evaporator 1.

[0014] According to the above technical solution, the blower 1 and the blower 2 are connected to an air duct via a three-way valve pipeline, a temperature sensor 2 is fixedly connected to the air duct, and the output end of the air duct is connected to the cab.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention provides a bottom plate, a first circuit in the bottom plate, a cooling plate and a second circuit in the cooling plate to liquid-cool the unit batteries in the battery pack, and controls the opening and closing degree of the temperature control valve and the working efficiency of the liquid pump, the first heat exchanger and the second heat exchanger according to different states of the battery pack to cool or heat the battery pack, thereby improving the service life and performance of the battery;

[0016] While cooling or heating the battery pack, the refrigerant system and heat medium system of the battery pack are effectively used to control the temperature in the cab, thereby improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of the battery pack structure of the present invention;

[0019] Figure 2 is a schematic diagram of the internal structure of the battery pack of the present invention;

[0020] Figure 3It is a schematic diagram of the overall structural system of the present invention;

[0021] In the figure: 1. battery pack; 2. cavity; 3. bottom plate; 4. groove; 5. unit cell; 6. first circuit; 7. liquid pump; 8. cooling plate; 9. second circuit; 10. temperature control valve; 11. heat exchanger 1; 12. refrigerant pipeline; 13. temperature sensor 1; 14. heat exchanger 2; 15. heat medium pipeline; 16. connecting pipe 1; 17. compressor 1; 18. flow regulating valve 1; 19. condenser 1; 20. expansion valve 1; 21. compressor 2; 22. flow regulating valve 2; 23. expansion valve 2; 24. evaporator 1; 25. condenser 2; 26. electric control valve; 27. blower 1; 28. blower 2; 29. ​​air duct; 30. temperature sensor 2; 31. cab; 32. connecting pipe 2. Implementation

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] For example, see Figure 1-3 The present invention provides a technical solution: an on-vehicle thermal management system, including a battery pack 1, a cavity 2 is formed in the battery pack 1, a bottom plate 3 is fixedly connected to the bottom side of the cavity 2, a plurality of grooves 4 are evenly formed on the upper side of the bottom plate 3, and unit batteries 5 are fixedly connected in the grooves 4;

[0024] A first loop 6 is provided in the bottom plate 3 , the input end of the first loop 6 passes through a pipeline on the right side wall of the battery pack 1 and is connected to a liquid pump 7 , and the output end of the first loop 6 passes through a pipeline on the right side wall of the battery pack 1 and is connected to the input end of the liquid pump 7 .

[0025] The four sides of the groove 4 are fixedly connected with cooling plates 8, a second circuit 9 is provided in the cooling plate 8, the input end and the output end of the second circuit 9 are both connected to the first circuit 6 through the pipeline of the cooling plate 8, and the pipeline connecting the input end and the output end of the second circuit 9 is fixedly connected with a temperature control valve 10, and the temperature control valve 10 controls the opening and closing by detecting the temperature of the liquid in the first circuit 6 and the second circuit 9;

[0026] A heat exchanger 11 is fixedly connected to a pipe on one side of the input end of the liquid pump 7, a refrigerant pipeline 12 is arranged on the right side of the heat exchanger 11, and the heat exchanger 11 is fixedly connected to the refrigerant pipeline 12;

[0027] A heat exchanger 2 14 is provided on one side of the input end of the heat exchanger 1 11, and the heat exchanger 2 14 is fixedly connected to the pipeline on one side of the input end of the liquid pump 7. A heat medium pipeline 15 is provided on the right side of the heat exchanger 14, and the heat exchanger 2 14 is fixedly connected to the heat medium pipeline 15;

[0028] A temperature sensor 13 is fixedly connected to a pipe on one side of the output end of the liquid pump 7 to detect the temperature of the liquid after heat exchange.

[0029] The refrigerant pipeline 12 includes a connecting pipe 16, to which a compressor 17, a flow regulating valve 18, a condenser 19, and an expansion valve 20 are fixedly connected in sequence;

[0030] The compressor 17 sucks the refrigerant in the connecting pipe 16 and compresses it into high-temperature and high-pressure gas, and then delivers it to the condenser 19. It is cooled by the condenser 19 and becomes high-pressure and low-temperature gas. Then, it passes through the throttling effect of the expansion valve 20 and absorbs the heat of the liquid in the first circuit 6 in the heat exchanger 11 and becomes a low-temperature and low-pressure liquid. Then, it enters the compressor 17 again to realize the refrigerant circulation. The flow regulating valve 18 is used to adjust the refrigerant flow output in the connecting pipe 16, wherein the heat exchanger 11 is an evaporator;

[0031] The heat medium pipeline 15 includes a second connecting pipe 32, on which a second compressor 21, a second flow regulating valve 22, a second expansion valve 23, and an evaporator 1 24 are fixedly connected in sequence;

[0032] The compressor 21 absorbs the refrigerant in the connecting pipe 232 and compresses it into a high-temperature and high-pressure gas. In the process of condensation and heat release in the heat exchanger 214, the compressor transfers the heat to the liquid in the first loop 6 to form a low-temperature and high-pressure gas. After that, the low-temperature and high-pressure gas is throttled by the expansion valve 23 and absorbs heat in the evaporator 1 24 to form a low-temperature and low-pressure liquid. Then, the liquid enters the compressor 21 again for compression to realize the heat medium circulation. The flow regulating valve 22 is used to adjust the refrigerant flow output in the connecting pipe 232, wherein the heat exchanger 214 is a condenser.

[0033] In this embodiment, when the battery pack 1 is not in operation, the normal temperature of the liquid in the first circuit 6 is A1°C, and the liquid pump 7 on the first circuit 6 is not in operation;

[0034] When the battery pack 1 is running at low temperature, the liquid pump 7 controls the liquid in the first loop 6 to run at a speed of V1, and part of the heat generated by the unit battery 5 is transferred to the bottom plate 3 through the cooling plate 8, and finally transferred to the liquid in the first loop 6, and heat is exchanged with the refrigerant pipeline 12 through the heat exchanger 11. At this time, the refrigerant circulation speed in the pipeline is controlled by the flow regulating valve 18 on the refrigerant pipeline 12, so that the temperature of the liquid in the first loop 6 after heat exchange is maintained at A1°C;

[0035] At the same time, another part of the heat is transferred to the liquid in the second circuit 9 through the cooling plate 8. At this time, the second circuit 9 is not connected to the first circuit 6, and the temperature control valve 10 is in a closed state. The liquid in the second circuit 9 has a certain specific heat capacity, and stores a certain value of the heat generated by the unit battery 5;

[0036] When the unit battery 5 is operating normally, the temperature control valve 10 on the second circuit 9 is set to open when it detects that the temperature of the liquid in the second circuit 9 reaches A2°C. The temperature control valve 10 is in a half-open state, and the first circuit 6 is connected to the second circuit 9. At the same time, the liquid pump 7 controls the liquid in the first circuit 6 to run at a speed of V2, and heat is exchanged with the refrigerant pipeline 12 through the heat exchanger 11. At this time, the flow regulating valve 18 on the refrigerant pipeline 12 controls the refrigerant circulation speed in the pipeline, so that the temperature of the liquid in the first circuit 6 after heat exchange is maintained at A1°C;

[0037] When the unit battery 5 is running at high temperature, the temperature control valve 10 detects that the liquid temperature reaches A3°C, the temperature control valve 10 is in a fully open state, the liquid pump 7 controls the liquid in the first loop 6 to run at a speed of V3, and heat is exchanged with the refrigerant pipeline 12 through the heat exchanger 11, and heat is exchanged with the refrigerant pipeline 12 through the heat exchanger 11. At this time, the refrigerant circulation speed in the pipeline is controlled by the flow control valve 18 on the refrigerant pipeline 12, so that the temperature of the liquid in the first loop 6 after heat exchange is maintained at A1°C;

[0038] When the unit cell 5 is in an ultra-low temperature state and cannot be started, the heat medium pipeline 15 is started, and at the same time, the liquid pump 7 controls the liquid in the first loop 6 to run at a speed of V3, and heat exchange is performed on the first loop 6 through the heat medium pipeline 15, so that the temperature of the liquid in the first loop 6 after heat exchange reaches A3°C. At this time, the temperature control valve 10 is in a fully open state, and the liquid in the first loop 6 circulates with the liquid in the second loop 9, and the temperature is transferred to the unit cell 5 through the cooling plate 8 for heating.

[0039] Embodiment 2, based on embodiment 1, adds the following structure:

[0040] A condenser 25 is connected in parallel to the heat medium pipeline 15, and both ends of the heat exchanger 14 are fixedly connected with an electric control valve 26. The condenser 19 and the condenser 25 are located at the same position on the car. A blower 27 is provided on one side of the condenser 19 and the condenser 25, and a blower 28 is provided on one side of the evaporator 24. The blower 27 and the blower 28 are connected to an air duct 29 through a three-way valve pipeline. A temperature sensor 2 30 is fixedly connected to the air duct 29. The output end of the air duct 29 is connected to a cab 31 for supplying heat and cooling to the cab 31.

[0041] In this embodiment, when the refrigerant pipeline 12 performs heat exchange on the first circuit 6, the heat medium pipeline 15 does not operate. When the cab 31 needs cooling, the heat medium pipeline 15 is started, and the two sets of electric control valves 26 are closed, so that the refrigerant in the connecting pipe 2 32 flows from the condenser 25 and absorbs heat at the evaporator 1 24, so that the air around the evaporator 1 24 becomes cold and is blown into the cab 31 through the blower 2 28, and the flow of the refrigerant in the connecting pipe 2 32 is adjusted by the flow regulator 2 to control the temperature of the blown air;

[0042] When the cab 31 needs to be heated, the hot air generated by the condenser 19 on the first circuit 6 is first blown into the air duct 29. When the temperature sensor 2 30 detects that the blown air is overheated, the heat medium pipeline 15 is started, and the two sets of electric control valves 26 are closed, so that the refrigerant in the connecting pipe 2 32 flows from the condenser 25 and absorbs heat at the evaporator 24, so that the air around the evaporator 24 becomes cold. The flow regulator 2 is controlled to adjust the flow of the refrigerant in the connecting pipe 2 32 to control the temperature of the cold air, and the cold air is blown into the air duct 29 through the blower 28 to mix and adjust with the hot air. After the temperature sensor 2 30 detects that the temperature in the air duct 29 is appropriate, the three-way valve is opened to allow air to enter the cab 31.

[0043] When the cab 31 needs to be heated, the hot air generated by the condenser 19 on the first circuit 6 is first blown into the air duct 29. When the temperature sensor 2 30 detects that the blown hot air has not reached the required temperature, the heat medium pipeline 15 is started, and the two sets of electric control valves 26 are closed to allow the refrigerant in the connecting pipe 2 32 to flow from the condenser 2 25. The flow regulator 2 is controlled to adjust the flow of the refrigerant in the connecting pipe 2 32 to control the hot air temperature. The hot air generated by the condenser 25 is blown into the air duct 29 through the blower 1 27. After the temperature sensor 2 30 detects that the temperature in the air duct 29 is appropriate, the three-way valve is opened to allow air to enter the cab 31.

[0044] A method for using a vehicle thermal management system:

[0045] S1: When the unit cell 5 is not started, the normal temperature of the liquid in the first circuit 6 is A1°C;

[0046] S2: Control the heat exchange flow rate of the liquid pump 7 on the liquid in the first circuit 6 and the opening and closing degree of the temperature control valve 10 through the operating state of the unit battery 5;

[0047] S21: When the unit cell 5 operates at low temperature, the liquid pump 7 controls the liquid to exchange heat with the refrigerant pipeline 12 at a flow rate of V1;

[0048] S22: When the unit battery 5 operates normally, the temperature control valve 10 detects that the temperature of the liquid in the second circuit 9 reaches A2°C, the temperature control valve 10 opens and is in a half-open state, the liquid pump 7 controls the liquid to exchange heat with the refrigerant pipeline 12 at a flow rate of V2, and the flow regulating valve 18 controls the flow of the refrigerant in the refrigerant pipeline 12, so that the liquid in the first circuit 6 after heat exchange is maintained at A1°C;

[0049] S23: When the unit battery 5 is running at high temperature, the temperature control valve 10 detects that the temperature of the liquid in the second circuit 9 reaches A3°C, the temperature control valve 10 opens and is in a fully open state, the liquid pump 7 controls the liquid to exchange heat with the refrigerant pipeline 12 at a flow rate of V3, and at the same time, the flow regulating valve 18 controls the flow of the refrigerant in the refrigerant pipeline 12, so that the liquid in the first circuit 6 after heat exchange is maintained at A1°C;

[0050] S24: When the unit cell 5 is in an ultra-low temperature state, the heat medium pipeline 15 is controlled to start, and the liquid pump 7 controls the liquid to exchange heat with the heat medium pipeline 15 at a flow rate of V3. At the same time, the flow regulating valve 18 controls the flow of the refrigerant in the heat medium pipeline 15, so that the liquid in the first circuit 6 after heat exchange is maintained at A3°C. At the same time, the temperature control valve 10 is in a fully open state to increase the temperature of the unit cell 5;

[0051] S3: While cooling the battery pack 1, the temperature in the cab 31 is regulated by controlling the opening and closing of the flow regulating valve 22 and the blowers 1 27 and 28 according to the temperature requirement of the cab 31;

[0052] S31: When the cab 31 needs to be cooled, the heat medium pipeline 15 is started, the electric control valve 26 is closed, and the cold air around the evaporator 2 is blown into the cab 31 through the air duct 29 by the blower 1 27, and the temperature is controlled by the flow regulating valve 2 22;

[0053] S32: When the cab 31 needs to be heated, the hot air around the condenser 19 is blown into the air duct 29 by the blower 28, the temperature of the blown hot air is detected by the temperature sensor 2 30, and the flow regulating valve 2 22 is controlled to control the hot and cold air on the heat medium pipeline 15, and the air with the appropriate temperature is blown into the air duct 29 for mixing and adjustment;

[0054] S321: When the temperature of the hot air blown into the air duct 29 is high, the blower 28 is started, and the hot air in the air duct 29 is regulated by adjusting the temperature of the cold air through the flow control valve 22 to meet the temperature requirement of the cab 31;

[0055] S322: When the temperature of the hot air blown into the air duct 29 is low, the temperature of the hot air around the condenser 25 is adjusted by the flow regulating valve 22, and the hot air in the air duct 29 is regulated to meet the temperature requirements of the cab 31.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle thermal management system, comprising a battery pack (1), characterized in that: The battery pack (1) has a cavity (2) formed therein, a bottom plate (3) is fixedly connected to the bottom side of the cavity (2), a plurality of grooves (4) are evenly formed on the top side of the bottom plate (3), and unit batteries (5) are fixedly connected in the grooves (4); A first circuit (6) is provided in the bottom plate (3); an input end of the first circuit (6) passes through a pipeline on the right side wall of the battery pack (1) and is connected to a liquid pump (7); an output end of the first circuit (6) passes through a pipeline on the right side wall of the battery pack (1) and is connected to an input end of the liquid pump (7); The four sides of the groove (4) are fixedly connected to cooling plates (8), a second circuit (9) is provided in the cooling plate (8), the input end and the output end of the second circuit (9) are both connected to the first circuit (6) through a pipeline passing through the cooling plate (8), and a temperature control valve (10) is fixedly connected to the pipeline connecting the input end and the output end of the first circuit (6) to the second circuit (9); A heat exchanger 1 (11) is fixedly connected to a pipeline on one side of the input end of the liquid pump (7), a refrigerant pipeline (12) is provided on the right side of the heat exchanger 1 (11), and the heat exchanger 1 (11) is fixedly connected to the refrigerant pipeline (12); A heat exchanger 2 (14) is provided on one side of the input end of the heat exchanger 1 (11), and the heat exchanger 2 (14) is fixedly connected to a pipeline on one side of the input end of the liquid pump (7). A heat medium pipeline (15) is provided on the right side of the heat exchanger 2 (14), and the heat exchanger 2 (14) is fixedly connected to the heat medium pipeline (15). A temperature sensor 1 (13) is fixedly connected to the pipeline on one side of the output end of the liquid pump (7).

2. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant pipeline (12) comprises a connecting pipe (16), to which a compressor (17), a flow regulating valve (18), a condenser (19), and an expansion valve (20) are fixedly connected in sequence.

3. The vehicle thermal management system according to claim 2, characterized in that: The heat medium pipeline (15) comprises a second connecting pipe (32), to which a second compressor (21), a second flow regulating valve (22), a second expansion valve (23), and an evaporator (24) are fixedly connected in sequence.

4. The vehicle thermal management system according to claim 3, characterized in that: The heat medium pipeline (15) is connected in parallel with a second condenser (25), and both ends of the second heat exchanger (14) are fixedly connected with electric control valves (26).

5. The vehicle thermal management system according to claim 4, characterized in that: A blower 1 (27) is provided on one side of the condenser 1 (19) and the condenser 2 (25), and a blower 2 (28) is provided on one side of the evaporator 1 (24).

6. The vehicle thermal management system according to claim 5, characterized in that: The blower 1 (27) and the blower 2 (28) are connected to an air duct (29) via a three-way valve pipeline. A temperature sensor 2 (30) is fixedly connected to the air duct (29). The output end of the air duct (29) is connected to a cab (31).

7. The method for using a vehicle thermal management system according to claim 6, characterized in that: S1: When the unit battery (5) is not started, the normal temperature of the liquid in the first circuit (6) is A1°C; S2: controlling the heat exchange flow rate of the liquid pump (7) for the liquid in the first circuit (6) and the opening and closing degree of the temperature control valve (10) through the operating state of the unit battery (5); S3: while cooling the battery pack (1), the temperature in the cab (31) is regulated by controlling the opening and closing of the flow regulating valve 2 (22) and the blower 1 (27) and the blower 2 (28) according to the temperature requirement of the cab (31); The specific steps of S2 are as follows: S21: When the unit cell (5) operates at a low temperature, the liquid pump (7) controls the liquid to exchange heat with the refrigerant pipeline (12) at a flow rate of V1; S22: When the unit battery (5) is operating normally, the temperature control valve (10) detects that the temperature of the liquid in the second circuit (9) reaches A2°C, the temperature control valve (10) opens and is in a half-open state, the liquid pump (7) controls the liquid to exchange heat with the refrigerant pipeline (12) at a flow rate of V2, and at the same time, the flow control valve 1 (18) controls the flow rate of the refrigerant in the refrigerant pipeline (12) so that the liquid in the first circuit (6) after the heat exchange is maintained at A1°C; S23: When the unit battery (5) is running at high temperature, the temperature control valve (10) detects that the temperature of the liquid in the second circuit (9) reaches A3°C, the temperature control valve (10) opens and is in a fully open state, the liquid pump (7) controls the liquid to exchange heat with the refrigerant pipeline (12) at a flow rate of V3, and at the same time, the flow control valve 1 (18) controls the flow rate of the refrigerant in the refrigerant pipeline (12) so that the liquid in the first circuit (6) after the heat exchange is maintained at A1°C; S24: When the unit battery (5) is in an ultra-low temperature state, the heat medium pipeline (15) is controlled to start, and the liquid pump (7) controls the liquid to exchange heat with the heat medium pipeline (15) at a flow rate of V3. At the same time, the flow regulating valve (18) controls the flow rate of the refrigerant in the heat medium pipeline (15) so that the liquid in the first circuit (6) after the heat exchange is maintained at A3°C. At the same time, the temperature control valve (10) is in a fully open state to increase the temperature of the unit battery (5).

8. The method for using a vehicle thermal management system according to claim 7, characterized in that: The specific steps of S3 are as follows: S31: When the cab (31) needs to be cooled, the heat medium pipeline (15) is started, the electric control valve (26) is closed, and the cold air around the evaporator 2 is blown into the cab (31) through the air duct (29) by the blower 1 (27), and the temperature is controlled by the flow regulating valve 2 (22); S32: When the cab (31) needs to be heated, the hot air around the condenser (19) is blown into the air duct (29) by the second blower (28). The temperature of the blown hot air is detected by the second temperature sensor (30), and the second flow control valve (22) is controlled to control the hot and cold air on the heat medium pipeline (15). Air with an appropriate temperature is selected and blown into the air duct (29) for mixing and adjustment.

9. The method for using a vehicle thermal management system according to claim 8, characterized in that: The specific steps of S32 are as follows: S321: When the temperature of the hot air blown into the air duct (29) is high, start the second blower (28), and adjust the temperature of the cold air through the second flow control valve (22) to control the hot air in the air duct (29) so that the temperature requirement of the cab (31) is met; S322: When the temperature of the hot air blown into the air duct (29) is low, the temperature of the hot air around the second condenser (25) is adjusted by the second flow regulating valve (22), and the hot air in the air duct (29) is regulated to meet the temperature requirement of the cab (31).

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