Thermal management system and vehicle

Abstract

The utility model relates to the field of vehicle technology, and in particular to a thermal management system and a vehicle. The thermal management system and the vehicle provided by the utility model, the refrigerant circulation loop can cool the cab through the evaporator, and the air heater in the battery pack coolant circulation loop is used to heat the cab and dissipate heat for the battery pack, the motor cooling circulation loop is used to cool the motor, and the second heat exchanger is connected to the air heater to heat the cab, thereby achieving the purpose of heating the cab by the waste heat of the motor and the battery, and also the purpose of heating the battery by the waste heat of the motor. In addition, the low-temperature radiator can dissipate heat for the battery cells in winter or low-temperature environments, and the heat dissipation of the battery pack can be achieved without using a compressor, so that the compressor can be started in a low-temperature environment to avoid the power system from not being able to work reliably.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a thermal management system and a vehicle. Background Art

[0002] Pure electric mining trucks are generally equipped with power batteries with large power. When the power battery of the electric mining truck is working normally, it will generate more heat during work due to the influence of the vehicle's working conditions and working environment. Therefore, the power battery needs to be cooled to avoid high temperature from burning the battery pack and affecting the normal operation of the vehicle system. At the same time, in summer or in high temperature environments, the cab also needs air conditioning for cooling to provide a comfortable driving environment for the driver.

[0003] In the prior art, the vehicle's power battery needs to dissipate heat after being charged or working for a period of time. The compressor of the thermal management system cannot work continuously and stably in winter or in an environment with extremely low temperatures, resulting in poor heat dissipation of the power battery, which will cause the entire power system to be unable to work reliably.

[0004] Therefore, there is an urgent need for a thermal management system to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a thermal management system, which can dissipate heat from a power battery of a vehicle after the power battery has been charged or worked for a period of time, thereby ensuring the reliable operation of the power system.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Thermal management system, including:

[0008] A refrigerant circulation circuit includes a compressor, a condenser, a first expansion valve and an evaporator connected in sequence, wherein the evaporator is used to cool the cab;

[0009] A battery pack coolant circulation loop includes a first water pump group, a battery liquid cooling pipe and a first heat exchanger connected in sequence, and also includes an air heater, the refrigerant outlet of the condenser is connected to the refrigerant inlet of the first heat exchanger, the refrigerant outlet of the first heat exchanger is connected to the inlet of the compressor, the first heat exchanger is used to cool the battery pack, the outlet of the battery liquid cooling pipe is also connected to the liquid inlet of the air heater, and the liquid outlet of the air heater is connected to the first water pump group;

[0010] The motor coolant circulation loop comprises a second water pump group, a motor liquid cooling pipe, a second heat exchanger and a water radiator connected in sequence, the coolant inlet of the second heat exchanger is respectively connected to the liquid outlet of the air heater and the outlet of the battery liquid cooling pipe, and the coolant outlet of the second heat exchanger is respectively connected to the liquid inlet of the air heater and the inlet of the first water pump group;

[0011] Among them, the battery pack coolant circulation loop also includes a low-temperature radiator, the low-temperature radiator and the condenser share a fan, the coolant inlet of the low-temperature radiator is connected to the battery liquid cooling pipe, and the coolant outlet of the low-temperature radiator is connected to the inlet of the first water pump group; the refrigerant circulation loop also includes a second expansion valve, the inlet of the second expansion valve is connected to the outlet of the condenser, and the outlet of the second expansion valve is connected to the refrigerant inlet of the first heat exchanger.

[0012] As a preferred technical solution of the above-mentioned thermal management system, the coolant outlet of the second heat exchanger is also connected to the inlet of the air-heating heater through a first switch valve.

[0013] As a preferred technical solution of the above thermal management system, the coolant outlet of the second heat exchanger is also connected to the battery liquid cooling pipe through a second switching valve.

[0014] As a preferred technical solution of the above-mentioned thermal management system, the battery pack coolant circulation loop also includes a heating element, and the heating element is arranged between the battery liquid cooling pipe and the first water pump group, and / or the heating element is arranged in the battery pack.

[0015] As a preferred technical solution of the above thermal management system, the heating element is a PTC heater, and / or the heating element is a heating film.

[0016] As a preferred technical solution of the above-mentioned thermal management system, it also includes a first three-way valve, and the coolant outlet of the low-temperature radiator, the coolant outlet of the first heat exchanger and the inlet of the first water pump group are respectively connected to the fluid of the first three-way valve.

[0017] As a preferred technical solution of the above thermal management system, a first filter is provided between the battery liquid cooling pipe and the low-temperature radiator; and / or,

[0018] A second filter is arranged between the water pump and the water radiator.

[0019] As a preferred technical solution of the above thermal management system, there are multiple battery liquid cooling tubes, and the liquid cooling outlets of the multiple battery liquid cooling tubes are all connected to the inlet of the first filter.

[0020] As a preferred technical solution for the above-mentioned thermal management system, the second water pump group includes a first water pump and a second water pump, the motor liquid cooling pipe includes a main motor liquid cooling pipe and an auxiliary motor liquid cooling pipe, the outlet of the first water pump is connected to the main motor liquid cooling pipe, and the outlet of the second water pump is connected to the auxiliary motor liquid cooling pipe.

[0021] As a preferred technical solution of the above-mentioned thermal management system, the motor coolant circulation loop also includes a second three-way valve and a four-way valve, the inlet of the second three-way valve is connected to the outlet of the auxiliary motor liquid cooling pipe, the first outlet of the second three-way valve is connected to the inlet of the water radiator, the second outlet of the second three-way valve is connected to the first inlet of the four-way valve, the second inlet of the four-way valve is connected to the outlet of the main motor liquid cooling pipe, the first outlet of the four-way valve is connected to the cooling medium inlet of the second heat exchanger, the second outlet of the four-way valve is connected to the inlet of the water radiator, and the outlet of the water radiator is respectively connected to the first water pump and the second water pump.

[0022] The utility model also provides a vehicle, comprising the thermal management system described in any one of the above solutions.

[0023] The utility model has at least the following beneficial effects:

[0024] The thermal management system and vehicle provided by the utility model can cool the cab through the evaporator through the refrigerant circulation loop, and the air heater in the battery pack coolant circulation loop is used to heat the cab and dissipate heat for the battery pack, and the motor cooling circulation loop is used to cool the motor, and the second heat exchanger is connected to the air heater to heat the cab, thereby achieving the purpose of heating the cab through the waste heat of the motor and the battery, and also achieving the purpose of heating the battery with the waste heat of the motor. In addition, the low-temperature radiator can dissipate heat for the battery cells in winter or low-temperature environments, and the heat dissipation of the battery pack can be achieved without using a compressor, so that the compressor can be started in a low-temperature environment to avoid the power system from not being able to work reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a thermal management system provided in an embodiment of the utility model.

[0027] In the figure:

[0028] 1. Compressor; 2. Condenser; 3. First expansion valve; 4. Evaporator; 5. First heat exchanger; 6. Air heater; 7. Second heat exchanger; 8. Water radiator; 9. Low-temperature radiator; 10. Second expansion valve; 11. First switch valve; 12. Second switch valve; 13. PTC heater; 14. First three-way valve; 15. First filter; 16. Second filter; 17. First water pump; 18. Second water pump; 19. Second three-way valve; 20. Four-way valve; 21. Third water pump; 22. Fourth water pump; 23. Main drive motor controller; 24. Auxiliary drive motor controller; 25. Main drive motor; 26. Auxiliary drive motor; 27. Battery pack; 28. Air conditioning panel. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] In the embodiment of the present utility model, Figure 1 As shown, the thermal management system includes a refrigerant circulation loop, a battery pack coolant circulation loop and a motor coolant circulation loop. The refrigerant circulation loop includes a compressor 1, a condenser 2, a first expansion valve 3 and an evaporator 4 connected in sequence; the battery pack coolant circulation loop includes a first water pump group, a battery liquid cooling pipe and a first heat exchanger 5 connected in sequence, and also includes an air heater 6. The refrigerant outlet of the condenser 2 is connected to the refrigerant inlet of the first heat exchanger 5, and the refrigerant outlet of the first heat exchanger 5 is connected to the inlet of the compressor 1. The first heat exchanger 5 is used to cool the battery pack 27. The outlet of the battery liquid cooling pipe is also connected to the liquid inlet of the air heater 6, and the liquid outlet of the air heater 6 is connected to the first water pump group; the motor coolant circulation loop includes a second water pump group, a motor liquid cooling pipe, a second heat exchanger 7 and a water radiator 8 connected in sequence. The coolant inlet is respectively connected to the liquid outlet of the air heater 6 and the outlet of the battery liquid cooling pipe, and the coolant outlet of the second heat exchanger 7 is respectively connected to the liquid inlet of the air heater 6 and the inlet of the first water pump group, so as to provide the waste heat of the motor to the cab and / or the battery pack 27 to heat the cab and / or the battery pack 27; the battery pack coolant circulation loop also includes a low-temperature radiator 9, the low-temperature radiator 9 and the condenser 2 share a fan, the coolant inlet of the low-temperature radiator 9 is connected to the battery liquid cooling pipe, and the coolant outlet of the low-temperature radiator 9 is connected to the inlet of the first water pump group; the refrigerant circulation loop also includes a second expansion valve 10, the inlet of the second expansion valve 10 is connected to the outlet of the condenser 2, the outlet of the second expansion valve 10 is connected to the refrigerant inlet of the first heat exchanger 5, and the coolant outlet of the second heat exchanger 7 is connected to the inlet of the compressor 1.

[0034] The thermal management system provided by the utility model has a refrigerant circulation loop that can cool the cab through the evaporator 4, and the air heater 6 in the battery pack coolant circulation loop is used to heat the cab and dissipate heat for the battery pack 27, and the motor cooling circulation loop is used to cool the motor, and the second heat exchanger 7 is connected to the air heater 6 to heat the cab, thereby achieving the purpose of heating the cab by the motor and battery through waste heat, and also achieving the purpose of heating the battery by the motor waste heat. The low-temperature radiator 9 can dissipate heat for the battery cells in winter or low-temperature environments, and the heat dissipation of the battery pack 27 can be achieved without using the compressor 1, so that the compressor 1 can be started in a low-temperature environment to avoid the power system from not being able to work reliably.

[0035] In some embodiments, the coolant outlet of the second heat exchanger 7 is also connected to the inlet of the air heater 6 through the first switch valve 11. By opening or closing the first switch valve 11, the heat of the motor can be transferred to the evaporator 4 to heat the cab, so that the heat generated by the motor can be utilized to meet the need to heat the cab when the battery has low heat at the beginning of work. The purpose of setting the first switch valve 11 is to prevent the heat of the motor from entering the cab when the cab does not need to be heated, so as to avoid the temperature in the cab rising and reducing the comfort of the cab.

[0036] In some embodiments, the coolant outlet of the second heat exchanger 7 is also connected to the battery liquid cooling pipe through the second switch valve 12. The purpose of the second switch valve 12 is to prevent the residual heat of the motor from being provided to the battery, causing the overall temperature of the battery pack 27 to continue to rise and affect the performance of the battery pack 27.

[0037] In some embodiments, the battery pack coolant circulation loop also includes a heating element, and the heating element is disposed between the battery liquid cooling pipe and the first water pump group, and / or the heating element is disposed in the battery pack 27. Specifically, the heating element is a PTC heater 13, and / or the heating element is a heating film. The PTC heater 13 is disposed between the battery liquid cooling pipe and the first water pump group. The PTC heater 13 can meet the heating needs of the battery at the beginning of operation in winter or low temperature environments. In addition, the PTC heater 13 and the second switch valve 12 work simultaneously, and the motor waste heat and the PTC heater 13 can work together to heat the battery pack 27, thereby accelerating the heating efficiency of the battery pack 27. In addition, the PTC heater 13 can also heat the cab to improve the comfort of the cab in low temperature environments.

[0038] The coolant medium in the coolant circulation loop of the battery pack is heated by the heating film or PTC and other heating elements in the battery pack. At the same time, the battery pack 27 can also be heated by the waste heat of the motor. The waste heat of the motor electronic control is fully utilized. In addition, the high-power PTC heater 13 can solve the problem of battery life in winter. As for the thermal management of the cab, the cab is heated by air-heated PTC, water-heated PTC or waste heat of the motor electronic control. When water-heated PTC heating is used, the cab heating and battery heating can be integrated with a common PTC heating device.

[0039] In order to realize that battery heating and battery cooling share a coolant circulation loop, in some embodiments, the thermal management system further includes a first three-way valve 14, and the coolant outlet of the low-temperature radiator 9, the coolant outlet of the first heat exchanger 5, and the inlet of the first water pump group are respectively connected to the first three-way valve 14. The first three-way valve 14 is specifically an electronic three-way valve, and the first three-way valve 14 can control the connection between the coolant outlet of the low-temperature radiator 9 and the inlet of the first water pump group, or control the connection between the coolant outlet of the first heat exchanger 5 and the inlet of the first water pump group according to the temperature emitted by the cab.

[0040] In some embodiments, a first filter 15 is provided between the battery liquid cooling tube and the low-temperature radiator 9. The first filter 15 can filter the coolant flowing out of the battery liquid cooling tube to prevent impurities from entering the evaporator 4 or the low-temperature radiator 9 and damaging the evaporator 4 or the low-temperature radiator 9.

[0041] In some embodiments, a second filter 16 is provided between the water pump and the water radiator 8. The second filter 16 can prevent impurities in the second radiator from entering the second water pump group and causing wear to the internal components of the second water pump group, thereby protecting the second water pump group.

[0042] In some embodiments, there are multiple battery liquid cooling tubes, so that the multiple battery liquid cooling tubes can correspond to multiple battery modules to achieve the purpose of cooling different battery modules. The liquid cooling outlets of the multiple battery liquid cooling tubes are connected to the inlet of the first filter 15, that is, the multiple battery liquid cooling tubes are arranged in parallel, and after cooling the battery modules corresponding to the battery liquid cooling tubes, they are gathered at the first filter 15, thereby cooling the different battery liquid cooling tubes and supplying the heat of the battery modules to the cab.

[0043] In some embodiments, the first heat exchanger 5 is a plate heat exchanger.

[0044] In some embodiments, the second heat exchanger 7 is a water-to-water heat exchanger.

[0045] In other embodiments, the first heat exchanger 5 is a plate heat exchanger, and the second heat exchanger 7 is a water-to-water heat exchanger.

[0046] In some embodiments, the second water pump group includes a first water pump 17 and a second water pump 18, and the motor liquid cooling pipe includes a main motor liquid cooling pipe and an auxiliary motor liquid cooling pipe. The main motor liquid cooling pipe is used to cool the main drive motor 25 and the main drive motor controller 23, and the auxiliary motor liquid cooling pipe is used to cool the auxiliary drive motor 26 and the auxiliary drive motor controller 24. The outlet of the first water pump 17 is connected to the main motor liquid cooling pipe, and the outlet of the second water pump 18 is connected to the auxiliary motor liquid cooling pipe. The first water pump 17 and the second water pump 18 work independently, and can provide power for the coolant of different motors, thereby improving the efficiency of cooling the motor.

[0047] Furthermore, the motor coolant circulation loop also includes a second three-way valve 19 and a four-way valve 20, the inlet of the second three-way valve 19 is connected to the outlet of the auxiliary motor liquid cooling pipe, the first outlet of the second three-way valve 19 is connected to the inlet of the water radiator 8, the second outlet of the second three-way valve 19 is connected to the first inlet of the four-way valve 20, the second inlet of the four-way valve 20 is connected to the outlet of the main motor liquid cooling pipe, the first outlet of the four-way valve 20 is connected to the cooling medium inlet of the second heat exchanger 7, the second outlet of the four-way valve 20 is connected to the inlet of the water radiator 8, and the outlet of the water radiator 8 is respectively connected to the first water pump 17 and the second water pump 18. The setting of the second three-way valve 19 can make part of the cooling medium flowing out of the auxiliary motor liquid cooling pipe enter the water radiator 8 for heat dissipation, and part of it enters the second radiator to provide heat for the cab and the battery pack 27, and the setting of the four-way valve 20 can satisfy that part of the cooling medium flowing out of the main motor liquid cooling pipe enters the water radiator 8, and the other part enters the cab or the battery pack 27 for heating.

[0048] The first water pump group includes at least a third water pump 21 and a fourth water pump 22, wherein the third water pump 21 and the fourth water pump 22 are respectively connected to the battery liquid cooling pipes corresponding to different battery packs 27, so as to provide cooling liquid for different battery packs 27, so that different battery packs 27 can be cooled by different water pumps, thereby improving the cooling efficiency of the battery pack 27.

[0049] like Figure 1As shown, when cooling the cab and / or the battery pack 27, the vaporized refrigerant gas is sucked into the compressor 1, compressed into a high-temperature and high-pressure gas and then discharged, and the gas is cooled into a high-pressure saturated liquid in the condenser 2. In this process, the heat generated in the condenser 2 is taken away by the fan, and the high-pressure saturated liquid is divided into two parallel circuits after coming out of the condenser 2. A part of the refrigerant flows to the evaporator 4 through the first expansion valve 3. After the refrigerant expands in this process, it will flow to the evaporator 4 in the form of a low-temperature and low-pressure mist. The refrigerant mist in the evaporator 4 absorbs heat from the air in the cab that contacts the evaporator 4 and evaporates, and it is then heated and evaporated in a gaseous state. The air is sucked into the compressor 1 to complete the cooling cycle in the cab, and the target temperature of the air outlet of the cab is adjusted according to the air conditioning panel 28; the other part flows to the first heat exchanger 5 in a low-temperature and low-pressure liquid state through the second expansion valve 10, and exchanges heat with the battery pack coolant circulation loop under the action of the first heat exchanger 5. The ethylene glycol antifreeze liquid with reduced temperature in the battery pack coolant circulation loop is transported from the water tank to each battery pack 27 at a certain flow rate and pressure under the action of the first water pump group to achieve cooling of the battery system. Finally, the refrigerants of different battery liquid cooling pipes are collected together and then enter the first heat exchanger 5 to exchange heat with the refrigerant circulation loop to complete the cycle. The heat dissipation of the motor electronic control is cooled by the cooling fan, and then transported to each motor under the action of the second water pump group to dissipate heat for different motors.

[0050] In the heating part, the battery pack heating and the battery pack cooling share a coolant circulation loop. A high-power PTC heater 13 is connected in series to the outlet of each battery water pump to ensure the heating of the battery system. At the same time, the motor will generate a lot of heat during operation. By connecting a second heat exchanger 7, the heat of the drive motor can be exchanged. The exchanged hot water can be used to heat the battery pack 27. When the battery pack 27 does not need to be heated, the channel can be closed by the second switch valve 12. The cab heating adopts air heating or water heating PTC heater 13. The air heating heater 6 directly heats the air, and the air flow through the inlet and outlet of the fan corresponding to the evaporator 4 forms warm air that is blown into the cab. The heating efficiency is higher and the warm air effect is more obvious. At the same time, when using water heating PTC, the hot water of the motor can be exchanged into the cab through the second heat exchanger 7, and the heating effect is better. When the cab does not need to be heated, the passage can still be closed by the first switch valve 11.

[0051] The application of the low-temperature radiator 9 is judged based on the ambient temperature sensor, and the controller or the ambient temperature sensor T8 transmits the ambient temperature in real time. When the ambient temperature is higher than the first threshold, the battery pack 27 is cooled by the compressor 1, the condenser 2 and the first heat exchanger 5. At this time, the opening of the first three-way valve 14 is AC circulation (B port opening 0%). When the ambient temperature is lower than the second threshold, the B port of the first three-way valve 14 is opened (B port opening 100%), AB circulation, and the heat of the battery pack 27 is dissipated through the low-temperature radiator 9. The second threshold is less than the first threshold. The switching between the low-temperature radiator 9 and the compressor 1 is not limited to the judgment based on the ambient temperature. The switching between the two different refrigeration modes can also be adjusted according to the return water temperature sensor T3 set at the coolant inlet of the first radiator, the water outlet temperature sensor T4 set at the coolant outlet of the first radiator, or the charge and discharge status of the battery pack 27.

[0052] When the cooling part, battery system, motor electronic control system and cab are integrated for heat dissipation as described above, the heat is dissipated through the integrated control logic of the integrated thermal management controller. In the charging state, when the ambient temperature is greater than a certain threshold, the controller reads the maximum temperature of the battery cell and the average temperature of the battery cell. When the maximum temperature of the battery cell is greater than a certain threshold and the average temperature of the battery cell is greater than a certain threshold, the battery cooling is turned on, and at the same time, the air conditioning panel 28 in the cab presses the cooling button. At this time, the controller controls the speed of the compressor 1, the speed of the fan and the opening of the second expansion valve 10 according to the water outlet temperature sensor T4 at the coolant outlet of the first radiator, and the controller opens the first expansion valve 3 in the room. Similarly, in the uncharged state, the cooling of the battery system and the cab is controlled according to a certain threshold.

[0053] The thermal management system adds a protection mechanism for the battery system and the cooling of the cab. When the temperature of the defrost temperature sensor is lower than a certain threshold, the cooling of the cab needs to be turned off. After the defrosting of the evaporator box is completed, the cooling of the cab can be turned on again.

[0054] The thermal management system protection mechanism is not limited to the defrost temperature sensor.

[0055] The utility model can heat the battery pack and the cab at the same time through motor waste heat recovery and PTC heater, which can effectively improve the problem of reduced cruising range due to low battery activity in low temperature environments, and can provide the driver with a comfortable driving environment; adding a low-temperature radiator can effectively solve the heat dissipation problem during battery charging and discharging in low temperature environments, and at the same time, the temperature range of the low-temperature radiator can be adjusted by the intelligent control system, which can greatly reduce the battery heat dissipation energy consumption.

[0056] High-power compressors, condensers and fans are used to integrate the heat dissipation of each independent system, realizing the heat dissipation of the motor and electronic control, the cooling of the battery pack and the cab. Through reasonable layout, the cooling of the two parts is further optimized, which is convenient for unified management and cost saving.

[0057] An embodiment of the utility model further provides a vehicle, comprising the thermal management system described in the above embodiment.

[0058] Since the thermal management system described above is included, the vehicle of the embodiment of the utility model has all the advantages and beneficial effects of the above embodiments, which will not be described in detail here.

[0059] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A thermal management system, characterized in that: include: A refrigerant circulation circuit comprises a compressor (1), a condenser (2), a first expansion valve (3) and an evaporator (4) which are connected in sequence, wherein the evaporator (4) is used to cool the cab; A battery pack coolant circulation loop comprises a first water pump group, a battery liquid cooling pipe and a first heat exchanger (5) connected in sequence, and also comprises an air heater (6), the refrigerant outlet of the condenser (2) is connected to the refrigerant inlet of the first heat exchanger (5), the refrigerant outlet of the first heat exchanger (5) is connected to the inlet of the compressor (1), the first heat exchanger (5) is used to cool the battery pack (27), the outlet of the battery liquid cooling pipe is also connected to the liquid inlet of the air heater (6), and the liquid outlet of the air heater (6) is connected to the first water pump group; A motor coolant circulation loop comprises a second water pump group, a motor liquid cooling pipe, a second heat exchanger (7) and a water radiator (8) connected in sequence, wherein the coolant inlet of the second heat exchanger (7) is respectively connected to the liquid outlet of the air heater (6) and the outlet of the battery liquid cooling pipe, and the coolant outlet of the second heat exchanger (7) is respectively connected to the liquid inlet of the air heater (6) and the inlet of the first water pump group; The battery pack coolant circulation loop also includes a low-temperature radiator (9), the low-temperature radiator (9) and the condenser (2) share a fan, the coolant inlet of the low-temperature radiator (9) is connected to the battery liquid cooling pipe, and the coolant outlet of the low-temperature radiator (9) is connected to the inlet of the first water pump group; the refrigerant circulation loop also includes a second expansion valve (10), the inlet of the second expansion valve (10) is connected to the outlet of the condenser (2), and the outlet of the second expansion valve (10) is connected to the refrigerant inlet of the first heat exchanger (5).

2. The thermal management system according to claim 1, characterized in that: The coolant outlet of the second heat exchanger (7) is also connected to the inlet of the air-heating heater (6) via the first switch valve (11).

3. The thermal management system according to claim 1, characterized in that: The coolant outlet of the second heat exchanger (7) is also connected to the battery liquid cooling pipe via a second switch valve (12).

4. The thermal management system according to claim 1, characterized in that: The battery pack coolant circulation loop also includes a heating element, which is arranged between the battery liquid cooling pipe and the first water pump group, and / or the heating element is arranged in the battery pack.

5. The thermal management system according to claim 4, characterized in that: The heating element is a PTC heater (13), and / or the heating element is a heating film.

6. The thermal management system according to claim 1, characterized in that: It also includes a first three-way valve (14), and the coolant outlet of the low-temperature radiator (9), the coolant outlet of the first heat exchanger (5) and the inlet of the first water pump group are respectively fluidically connected to the first three-way valve (14).

7. The thermal management system according to claim 1, characterized in that: A first filter (15) is provided between the battery liquid cooling pipe and the low-temperature radiator (9); and / or, A second filter (16) is provided between the water pump and the water radiator (8).

8. The thermal management system according to claim 1, characterized in that: The second water pump group comprises a first water pump (17) and a second water pump (18); the motor liquid cooling pipe comprises a main motor liquid cooling pipe and an auxiliary motor liquid cooling pipe; the outlet of the first water pump (17) is connected to the main motor liquid cooling pipe, and the outlet of the second water pump (18) is connected to the auxiliary motor liquid cooling pipe.

9. The thermal management system according to claim 8, characterized in that: The motor coolant circulation loop also includes a second three-way valve (19) and a four-way valve (20), wherein the inlet of the second three-way valve (19) is connected to the outlet of the auxiliary motor liquid cooling pipe, the first outlet of the second three-way valve (19) is connected to the inlet of the water radiator (8), the second outlet of the second three-way valve (19) is connected to the first inlet of the four-way valve (20), the second inlet of the four-way valve (20) is connected to the outlet of the main motor liquid cooling pipe, the first outlet of the four-way valve (20) is connected to the cooling medium inlet of the second heat exchanger (7), the second outlet of the four-way valve (20) is connected to the inlet of the water radiator (8), and the outlet of the water radiator (8) is respectively connected to the first water pump (17) and the second water pump (18).

10. A vehicle, characterized in that Comprising a thermal management system as claimed in any one of claims 1 to 9.

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