Electric vehicle thermal management system and vehicle

Abstract

The present invention provides an electric vehicle thermal management system and vehicle. The electric vehicle thermal management system includes an oil circulation system, a refrigerant circulation system, and a coolant circulation system. The coolant circulation system has six passages, each of which can be connected via a valve block to allow at least two passages to communicate. The electric vehicle thermal management system and vehicle provided by embodiments of the present invention can achieve multiple operating conditions for heating or cooling the passenger compartment, battery pack, and drive unit, improving the integration of the thermal management system, reducing the number of components, reducing layout space, simplifying piping design, improving resource utilization, and increasing the functional diversity of electric vehicle thermal management.

Description

Technical Field

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

[0002] Pure electric vehicles have begun to gain market share. With their development, thermal management systems are becoming increasingly sophisticated, with heat pump systems gaining increasing adoption due to their significant energy-saving advantages. Heat pump systems are generally categorized as direct and indirect. However, due to their single heat extraction method and numerous piping and valve components, current solutions require improved energy utilization. Furthermore, their large footprint hinders long-term adoption and limits the application of heat pump technology. Therefore, a comprehensive pure electric vehicle thermal management system is urgently needed to address these challenges. Summary of the Invention

[0003] The present invention provides an electric vehicle thermal management system and vehicle, which can realize multiple operating conditions of heating or cooling the passenger compartment, battery pack, and drive device, improve the integration of the thermal management system, reduce the number of components, reduce layout space, reduce the difficulty of pipeline design, improve resource utilization, and enhance the functional diversity of electric vehicle thermal management.

[0004] One aspect of an embodiment of the present invention provides an electric vehicle thermal management system, comprising: an oil circulation system, a refrigerant circulation system, and a coolant circulation system;

[0005] The oil circulation system includes: an oil cooler;

[0006] The refrigerant circulation system includes: a first condenser, a second condenser, an evaporator and a heat exchanger that are connected to each other, and the first condenser and the evaporator are both connected to the passenger compartment of the electric vehicle;

[0007] The coolant circulation system includes six passages, a first three-way valve is provided in a first passage, the first passage is divided into a first branch and a second branch by the first three-way valve, a radiator is provided in the first branch, a first water pump and the oil cooler are provided in the second passage, a second water pump and the heat exchanger are provided in the third passage, a heater core is provided in the fourth passage, the heater core is connected to the passenger compartment of the electric vehicle, a third water pump and a battery pack are provided in the fifth passage, and the second condenser is provided in the sixth passage;

[0008] The six passages are connected by a valve group so that at least two passages are in communication with each other.

[0009] The electric vehicle thermal management system provided in the embodiment of the present application divides the coolant circulation system into six paths and realizes series and parallel connection between the six paths through a valve group, thereby realizing various working conditions of heating or cooling the passenger compartment, battery pack, and drive device, improving the integration of the thermal management system, reducing the number of components, reducing the layout space, reducing the difficulty of pipeline design, improving resource utilization, and increasing the functional diversity of electric vehicle thermal management.

[0010] In a possible implementation, the refrigerant circulation system further includes: a compressor, a second three-way valve;

[0011] After the compressor is connected to the second three-way valve, it is divided into a third branch and a fourth branch. The first condenser is provided on the third branch, and the second condenser is provided on the fourth branch. The third branch and the fourth branch are connected to the compressor after merging.

[0012] In a possible implementation, the refrigerant circulation system further includes: a first expansion valve and a second expansion valve;

[0013] The third branch and the fourth branch are divided into a fifth branch and a sixth branch after merging. The first expansion valve and the evaporator are provided on the fifth branch, and the second expansion valve and the heat exchanger are provided on the sixth branch. The fifth branch and the sixth branch are connected to the compressor after merging.

[0014] In a possible implementation manner, the first passage, the third passage, the second passage, and the fourth passage are connected in series to form a loop.

[0015] In a possible implementation manner, the first passage, the sixth passage, the fifth passage, the third passage, the second passage, and the fourth passage are connected in series to form a loop.

[0016] In a possible implementation manner, the first passage, the sixth passage, the second passage, and the fourth passage are connected in series to form a loop.

[0017] In a possible implementation, the further comprising: a third three-way valve and a first control unit;

[0018] The third three-way valve and the first control unit are arranged in the fifth passage, and the fifth passage is divided into a seventh branch and an eighth branch through the third three-way valve. The first control unit is located on the seventh branch, and the battery pack is located on the eighth branch.

[0019] In a possible implementation manner, the device further includes: a second control unit, wherein the second control unit is disposed in the second passage.

[0020] In a possible implementation manner, the system further includes: a muffler, wherein the muffler is disposed between the compressor and the second three-way valve.

[0021] In a possible implementation manner, the system further includes: a liquid storage dryer, wherein the liquid storage dryer is disposed adjacent to the upstream end of the compressor.

[0022] In a possible implementation, the valve group is a twelve-way valve.

[0023] In one possible implementation, the oil circulation system further includes: an oil pump and a drive device, wherein the oil pump is connected to the drive device and the oil cooler to form a loop. Another embodiment of the present application provides a vehicle including the electric vehicle thermal management system described above.

[0024] The vehicle provided in the embodiment of the present application, wherein the electric vehicle thermal management system divides the coolant circulation system into six paths and realizes series and parallel connection between the six paths through a valve group, thereby realizing various working conditions of heating or cooling the passenger compartment, battery pack, and drive device, improving the integration of the thermal management system, reducing the number of components, reducing the layout space, reducing the difficulty of pipeline design, improving resource utilization, and improving the functional diversity of electric vehicle thermal management. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of the structure of a thermal management system for an electric vehicle provided in one embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0029] Figure 4 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0031] Figure 6 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0032] Figure 7 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0033] Figure 8 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0034] Figure 9 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0035] Figure 10 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0036] Figure 11 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0037] Figure 12 A schematic diagram of the structure of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application;

[0038] Figure 13 This is a schematic structural diagram of a thermal management system for an electric vehicle under one operating condition provided by one embodiment of the present application.

[0039] Description of reference numerals:

[0040] 100-Electric vehicle thermal management system; 10-Oil circulation system; 11-Drive device;

[0041] 12-Oil cooler; 13-Oil pump; 21-Compressor;

[0042] 22-second three-way valve; 23-first condenser; 24-second condenser;

[0043] 25-first expansion valve; 26-evaporator; 27-second expansion valve;

[0044] 28-heat exchanger; 31-first three-way valve; 32-radiator;

[0045] 33-first water pump; 34-second water pump; 35-heater core;

[0046] 36-third water pump; 37-battery pack; 38-electronic fan;

[0047] 40-valve group; 51-third three-way valve; 52-first control unit;

[0048] 60-second control unit; 70-muffler; 80-liquid storage dryer;

[0049] 90-Coolant storage equipment;

[0050] R1-first path; R2-second path; R3-third path;

[0051] R4 - fourth path; R5 - fifth path; R6 - sixth path. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings 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 making creative efforts shall fall within the scope of protection of the present invention.

[0053] Pure electric vehicles have begun to gradually become popular in the market, and thermal management systems are becoming increasingly sophisticated. Among them, heat pump heating systems are increasingly being adopted due to their huge energy-saving advantages. Heat pump heating technology refers to the process of compressing a vapor-state refrigerant through a compressor, releasing the heat of the high-temperature and high-pressure refrigerant to the passenger compartment. After throttling and expanding through an expansion valve, the refrigerant absorbs heat from the low-temperature outdoor environment and then returns to the compressor for compression. From the perspective of energy conservation, the heat pump system increases the energy quality of the heat in the low-temperature outdoor air through the compression action of the compressor and then releases it to places where heat is needed, such as the passenger compartment or battery pack. Due to the absorption of "free" heat from the environment, its energy efficiency ratio (OP) of the second branch will be improved, thereby achieving energy savings and increasing the range of electric vehicles.

[0054] However, the introduction of the heat pump system will make the thermal management system architecture of the entire vehicle more complex, and the piping layout and avoidance work of the refrigerant loop and the coolant loop will become very tedious and complicated. In addition, the electric vehicle heat pump system architecture provided in the related art has a large number of components, a low degree of integration, poor flexible matching capabilities, low platform commonality, and a low component reuse rate. To meet different needs, the architecture needs to be significantly adjusted and changed, and each instance corresponds to a new solution, resulting in a waste of resources. In addition, due to the characteristics of the heat pump system's single heat absorption method and the large number of pipeline valves, the energy utilization method of the current technical solution needs to be improved, and the layout space is large, which is not conducive to long-term promotion and utilization, and limits the application of heat pump technology. Therefore, realizing the modular design of the thermal management system is a direction that needs to be studied urgently.

[0055] The electric vehicle thermal management system and vehicle provided in the embodiments of the present application are intended to solve the above problems in the related art.

[0056] The electric vehicle thermal management system and vehicle provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Figure 1 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 provided in one embodiment of the present application, refer to Figure 1 As shown, an electric vehicle thermal management system 100 provided in one embodiment of the present application may include: an oil circulation system 10, a refrigerant circulation system, and a coolant circulation system. The oil circulation system 10 is shown as the structure enclosed within the rectangular frame formed by the half-dotted lines in the figure, the refrigerant circulation system is shown as the dotted line in the figure, and the coolant circulation system is shown as the solid line in the figure.

[0058] Specifically, the oil circulation system 10 includes a driving device 11 , an oil cooler 12 , and an oil pump 13 , which are connected to form a loop. The oil cooler 12 is used to dissipate heat for the driving device 11 .

[0059] The refrigerant circulation system includes a compressor 21, a second three-way valve 22, a first condenser 23, a second condenser 24, a first expansion valve 25, an evaporator 26, a second expansion valve 27, a heat exchanger 28, a muffler 70, and a receiver-dryer 80. After the compressor 21 is connected to the second three-way valve 22, it branches into a third branch and a fourth branch. The third branch is provided with the first condenser 23, which is a built-in condenser and communicates with the passenger compartment of the electric vehicle for heating. The fourth branch is provided with the second condenser 24, which may be a water-cooled condenser. After the third and fourth branches converge, they branch into a fifth branch and a sixth branch. The fifth branch is provided with the first expansion valve 25 and the evaporator 26, which communicates with the passenger compartment of the electric vehicle for cooling. The sixth branch is provided with the second expansion valve 27 and the heat exchanger 28, which may be a plate heat exchanger. The fifth branch and the sixth branch merge and connect to the compressor 21 to form a loop.

[0060] The coolant circulation system includes six passages. A first three-way valve 31 is provided in the first passage R1. The third branch is divided into a first branch and a second branch by the first three-way valve 31. A radiator 32 is provided in the first branch for heat exchange with the ambient air. The radiator 32 dissipates heat via an electronic fan 38. A first water pump 33, an oil cooler 12, and a second control unit 60 are provided in the second passage R2. A second water pump 34 and a heat exchanger 28 are provided in the third passage R3. A heater core 35 is provided in the fourth passage R4 and is connected to the passenger compartment. A third water pump 36 and a battery pack 37 are provided in the fifth passage R5. A second condenser 24 is provided in the sixth passage R6. The six passages are connected by a valve group 40 to ensure communication between at least two of the passages.

[0061] It should be noted that in the embodiments of the present application, the circulating medium in the refrigerant circulation system includes, but is not limited to, refrigerants such as R134a refrigerant, R744 (carbon dioxide), R718 (water), R290 (propane), R717 (ammonia), R410a, R32, R1234yf, R502, R12, R22, R407c, and R600a, or any combination of two or more of these refrigerants. The circulating medium in the coolant circulation system includes, but is not limited to, water, antifreeze, or ethylene glycol.

[0062] It can be understood that the electric vehicle thermal management system 100 provided in the embodiment of the present application divides the coolant circulation system into six paths and realizes series and parallel connection between the six paths through the valve group 40, so as to realize various working conditions of heating or cooling of the passenger compartment, the battery pack 37, and the drive device 11, thereby improving the integration of the thermal management system, reducing the number of components, reducing the layout space, reducing the difficulty of pipeline design, improving resource utilization, and improving the functional diversity of electric vehicle thermal management.

[0063] The series and parallel connection between the various paths in the above-mentioned coolant circulation system can be realized by switching the mode of the valve group 40. The valve group 40 can be a single valve or a combination of multiple valves to realize the connection of the six paths in the above-mentioned coolant circulation system. Figure 1 As shown, in one possible implementation, the valve group 40 may be a twelve-way valve.

[0064] Figure 2 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 2As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dot-dashed lines indicate no liquid flow or no effective flow. In one operating condition of the present application, in the refrigerant circulation system, the third branch is closed and the fourth branch is opened by opening and closing the second three-way valve 22, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the second condenser 24 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0065] In the coolant circulation system, by switching the valve group 40, the first passage R1, the sixth passage R6, and the second passage R2 can be connected in series to form a loop. The second branch is closed by the first three-way valve 31. The working fluid flows through the loop formed by the radiator 32, the second condenser 24, and the oil cooler 12, forming a coolant circuit. The third passage R3 and the fifth passage R5 are connected in series to form a loop. The working fluid flows through the loop formed by the heat exchanger 28 and the battery pack 37, forming a coolant circuit.

[0066] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0067] It should be understood that under this operating condition, the refrigerant circuit can absorb the heat of the battery pack 37 through the heat exchanger 28 to cool the battery pack 37. In addition, the waste heat of the drive device 11 and the second condenser 24 can be released into the ambient air through the radiator 32.

[0068] Figure 3 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 3 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dot-dashed lines indicate no liquid flow or no effective flow. In one operating condition of the present application, in the refrigerant circulation system, the third branch is closed and the fourth branch is opened by opening and closing the second three-way valve 22, and the sixth branch is closed by the second expansion valve 27. The working medium circulates in the loop formed by the compressor 21, the second condenser 24 and the evaporator 26, forming a refrigerant circuit cycle.

[0069] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the sixth passage R6 and the second passage R2 can be connected in series to form a loop, and the second branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the radiator 32, the second condenser 24 and the oil cooler 12, forming a coolant circuit circulation.

[0070] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0071] It should be understood that under this operating condition, the refrigerant circuit can absorb heat from the passenger compartment through the evaporator 26 to achieve air conditioning and cooling. In addition, the waste heat from the drive device 11 and the second condenser 24 can be released into the air environment through the radiator 32.

[0072] Figure 4 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 4 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dotted line indicates no liquid flow or no effective flow. In one working condition of the present application, in the refrigerant circulation system, the third branch is closed, the fourth branch is opened, and the fifth and sixth branches are both open by opening and closing the second three-way valve 22. The working medium circulates in the loop formed by the compressor 21, the second condenser 24, the evaporator 26 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0073] In the coolant circulation system, by switching the valve group 40, the first passage R1, the sixth passage R6, and the second passage R2 can be connected in series to form a loop. The second branch is closed by the first three-way valve 31. The working fluid flows through the loop formed by the radiator 32, the second condenser 24, and the oil cooler 12, forming a coolant circuit. The third passage R3 and the fifth passage R5 are connected in series to form a loop. The working fluid flows through the loop formed by the heat exchanger 28 and the battery pack 37, forming a coolant circuit.

[0074] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0075] It should be understood that under these operating conditions, the refrigerant circuit can absorb heat from the passenger compartment through the evaporator 26, achieving air conditioning and cooling. Furthermore, the refrigerant circuit can absorb heat from the battery pack 37 through the heat exchanger 28, thereby cooling the power battery. Furthermore, waste heat from the drive unit 11 and the second condenser 24 can be released into the air through the radiator 32.

[0076] Figure 5 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 5 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dot-dashed lines indicate no liquid flow or no effective flow. In one operating condition of the present application, in the refrigerant circulation system, the third branch is closed and the fourth branch is opened by opening and closing the second three-way valve 22, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the second condenser 24 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0077] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the third passage R3, the fifth passage R5, the sixth passage R6 and the second passage R2 can be connected in series to form a loop, and the second branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the radiator 32, the heat exchanger 28, the battery pack 37, the second condenser 24, and the oil cooler 12, forming a coolant circuit circulation.

[0078] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0079] It should be understood that under such operating conditions, the refrigerant circuit can absorb heat from the coolant circuit through the heat exchanger 28 to achieve rapid cooling of the battery pack 37 and the drive unit 11. Furthermore, waste heat from the drive unit 11 and the second condenser 24 can be released to the ambient air through the radiator 32.

[0080] Figure 6 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 6 As shown, the solid arrows in the figure represent the direction of liquid flow, and the dotted lines represent no liquid flow or no effective flow. In one working condition of the present application, the refrigerant circulation system is completely closed.

[0081] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the third passage R3, and the second passage R2 can be connected in series to form a loop, and the second branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the radiator 32, the heat exchanger 28, and the oil cooler 12, forming a coolant circuit circulation.

[0082] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0083] It should be understood that under such operating conditions, the coolant circuit can release waste heat from the drive device 11 into the ambient air through the radiator 32 .

[0084] Figure 7 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 7 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dotted line indicates no liquid flow or no effective flow. In one working condition of the present application, in the refrigerant circulation system, the third branch is opened and the fourth branch is closed by opening and closing the second three-way valve 22, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the first condenser 23 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0085] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the third passage R3 and the second passage R2 can be connected in series to form a loop, and the second branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the radiator 32, the heat exchanger 28 and the oil cooler 12, forming a coolant circuit circulation.

[0086] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0087] It should be understood that under this operating condition, the heat exchanger 28 can use the radiator 32 to absorb heat from the ambient air through the coolant circuit circulation or use the oil cooler 12 to absorb the waste heat of the drive device 11, and then release the heat to the passenger compartment through the first condenser 23 through the refrigerant circuit circulation, thereby realizing the heating function of the passenger compartment.

[0088] Figure 8 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 8 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dotted line indicates no liquid flow or no effective flow. In one working condition of the present application, in the refrigerant circulation system, the third branch is closed by opening and closing the second three-way valve 22, the fourth branch is opened, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the second condenser 24 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0089] In the coolant circulation system, the valve group 40 switches modes, connecting the first, third, and second branches R1, R3, and R2 in series to form a loop. The second branch is closed by the first three-way valve 31, allowing the working fluid to flow through the loop formed by the radiator 32, heat exchanger 28, and oil cooler 12, forming a coolant circuit. The fifth and sixth branches R5 and R6 are connected in series to form a loop, allowing the working fluid to flow through the loop formed by the battery pack 37 and the second condenser 24, completing the coolant circuit.

[0090] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0091] It should be understood that under this operating condition, the heat exchanger 28 can use the radiator 32 to absorb heat from the ambient air through the coolant circuit circulation or use the oil cooler 12 to absorb the waste heat of the drive device 11, and then release the heat to the battery pack 37 through the second condenser 24 through the refrigerant circuit circulation, thereby realizing the heating function of the battery pack 37.

[0092] Figure 9 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 9As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dot-dashed lines indicate no liquid flow or no effective flow. In one operating condition of the present application, in the refrigerant circulation system, the third and fourth branches are opened by the second three-way valve 22, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the first condenser 23, the second condenser 24, and the heat exchanger 28, forming a refrigerant circuit cycle.

[0093] In the coolant circulation system, the valve group 40 switches modes, connecting the first, third, and second passages R1, R3, and R2 in series to form a loop. The sixth passage R6 is closed by the first three-way valve 31, allowing the working fluid to flow through the loop formed by the radiator 32, heat exchanger 28, and oil cooler 12, forming a coolant circuit. The fifth and sixth passages R5 and R6 are connected in series to form a loop, allowing the working fluid to flow through the loop formed by the second condenser 24 and battery pack 37, completing the coolant circuit.

[0094] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0095] It should be understood that under these operating conditions, heat exchanger 28 can absorb ambient heat through the coolant circuit, using radiator 32, or absorb waste heat from drive unit 11 through oil cooler 12. The heat can then be released through the refrigerant circuit to battery pack 37 via second condenser 24, thereby heating the batteries. Furthermore, heat can be released to the passenger compartment via first condenser 23, thereby heating the passenger compartment.

[0096] Figure 10 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 10 As shown, the solid arrows in the figure represent the direction of liquid flow, and the dotted lines represent no liquid flow or no effective flow. In one working condition of the present application, the refrigerant circulation system is completely closed.

[0097] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the third passage R3, the second passage R2 and the fourth passage R4 can be connected in series to form a loop, and the first branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the heat exchanger 28, the oil cooler 12 and the heater core 35, forming a coolant circuit circulation.

[0098] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0099] It should be understood that under this operating condition, the waste heat of the drive device 11 can be circulated through the coolant circuit and the heater core 35 can release the heat to the passenger compartment, thereby realizing the passenger compartment heating function.

[0100] Figure 11 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 11 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dot-dashed lines indicate no liquid flow or no effective flow. In one operating condition of the present application, in the refrigerant circulation system, the third branch is closed and the fourth branch is opened by opening and closing the second three-way valve 22, and the fifth branch is closed by the first expansion valve 25. The working medium circulates in the loop formed by the compressor 21, the second condenser 24 and the heat exchanger 28, forming a refrigerant circuit cycle.

[0101] In the coolant circulation system, the valve group 40 switches modes, connecting the first, third, second, and fourth passages R1, R3, R2, and R4 in series to form a loop. The second branch is closed by the first three-way valve 31, allowing the working fluid to flow through the loop formed by the radiator 32, heat exchanger 28, oil cooler 12, and heater core 35, forming a coolant circuit. The fifth and sixth passages R5 and R6 are connected in series to form a loop, allowing the working fluid to flow through the loop formed by the battery pack 37 and the second condenser 24, completing the coolant circuit.

[0102] The oil circulation system 10 is closed.

[0103] It should be understood that under this operating condition, the heat exchanger 28 can absorb heat from the ambient air and the passenger compartment respectively through the radiator 32 and the heater core 35 through the coolant circuit, and release it to the battery pack 37 through the second condenser 24, thereby realizing the heating function of the battery pack 37.

[0104] Figure 12 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 12 As shown, the solid arrows in the figure represent the direction of liquid flow, and the dot-dashed lines represent no liquid flow or no effective flow. In one working condition of the present application, the refrigerant circulation system is closed.

[0105] In the coolant circulation system, by switching the mode of the valve group 40, the first passage R1, the sixth passage R6, the fifth passage R5, the third passage R3, the second passage R2, and the fourth passage R4 can be connected in series to form a loop, and the second branch is closed by the first three-way valve 31. The working medium flows in the loop formed by the radiator 32, the second condenser 24, the battery pack 37, the radiator 32, the oil cooler 12, and the heater core 35, forming a coolant circuit circulation.

[0106] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0107] It should be understood that under this operating condition, the waste heat or active heat generated by the drive device 11 can be transferred to the battery pack 37 through the coolant circuit circulation or released to the passenger compartment through the heater core 35, thereby realizing the heating function of the battery pack 37 and the heating function of the passenger compartment.

[0108] Figure 13 This is a schematic diagram of the structure of the electric vehicle thermal management system 100 under one working condition provided by an embodiment of the present application, with reference to Figure 13 As shown in the figure, the solid arrows indicate the direction of liquid flow, and the dotted lines indicate no liquid flow or no effective flow. In one operating condition of the present application, all components of the refrigerant circulation system are turned on, and the working medium flows in the loop formed by the compressor 21, the first condenser 23, the second condenser 24, the evaporator 26, and the heat exchanger 28, forming a refrigerant circuit cycle.

[0109] In the coolant circulation system, the valve group 40 switches modes, connecting the first, sixth, second, and fourth pathways R1, R6, R2, and R4 in series to form a loop. The second branch is closed by the first three-way valve 31, allowing the working fluid to flow through the loop formed by the radiator 32, the second condenser 24, the oil cooler 12, and the heater core 35, forming a coolant circuit. Connecting the third and fifth pathways R3 and R5 in series to form a loop allows the working fluid to flow through the loop formed by the battery pack 37 and the heat exchanger 28, completing the coolant circuit.

[0110] The drive device 11 and the oil cooler 12 form an oil circuit circulation.

[0111] It should be understood that under these operating conditions, the refrigerant circuit can absorb heat from the passenger compartment through the evaporator 26, achieving air conditioning and cooling. Furthermore, heat from the battery pack 37 can be absorbed through the heat exchanger 28, thereby cooling the battery pack 37. Furthermore, waste heat from the drive unit 11 and the second condenser 24 can be released to the ambient air through the radiator 32 or, in conjunction with a split-system air conditioner, utilize the heater core 35 to enhance the system's heat dissipation capacity.

[0112] Continue to refer Figure 1 As shown, in some embodiments of the present application, the electric vehicle thermal management system 100 may further include: a third three-way valve 51 and a first control unit 52. The third three-way valve 51 and the first control unit 52 are disposed in the fifth passage R5. The fifth passage R5 is divided into a seventh branch and an eighth branch by the third three-way valve 51. The first control unit 52 is located on the seventh branch, and the battery pack 37 is located on the eighth branch. The first control unit 52 may be an autonomous driving control unit for the electric vehicle, or other equipment requiring heat dissipation. The heat dissipation and heating methods of the first control unit 52 are the same as those of the battery pack 37.

[0113] Continue to refer Figure 1 As shown, in some embodiments of the present application, the electric vehicle thermal management system 100 may further include: a second control unit 60, which is disposed on the second passage R2. Of course, the second control unit 60 may also be other devices, such as an oil diffusion pump.

[0114] In some embodiments of the present application, the electric vehicle thermal management system 100 may further include a muffler 70 and a liquid storage dryer 80. The muffler 70 is arranged between the compressor 21 and the second three-way valve 22, for example, near the downstream end of the compressor 21, and the liquid storage dryer 80 is arranged between the sixth branch and the first branch and the compressor 21, for example, near the upstream end of the compressor 21.

[0115] Continue to refer Figure 1 As shown, the electric vehicle thermal management system 100 may further include a coolant storage device 90 for providing coolant supply to the coolant circulation system. Figure 1 As shown, the coolant reservoir 90 is in communication with the first passage R1 and the fifth passage R5.

[0116] In summary, the electric vehicle thermal management system 100 provided in this embodiment of the present application improves heat utilization and resolves heat waste by designing water circuits for various components. Furthermore, a valve assembly 40, such as a twelve-way valve, enables series and parallel operation of various circulating water circuits, saving layout space. This advantageously improves energy utilization, thereby increasing vehicle range; achieves high integration, saves layout space, and enhances the cabin layout; and enables waste heat from the drive unit 11 to be directly used to heat the passenger compartment and battery pack 37, as well as rapidly cool the drive unit 11.

[0117] An embodiment of the present application also provides a vehicle, including the electric vehicle thermal management system 100 shown above. The technical features of the electric vehicle thermal management system 100, the technical effects achieved by the technical features, and the technical problems that can be solved by the technical effects are the same as above and will not be described in detail here.

[0118] Although the present application has been described above with reference to certain embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there are no structural conflicts, the various features of the various embodiments disclosed in this application may be combined with each other in any manner, and these combinations are not exhaustively described in this specification for the sake of space and resource conservation. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0119] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0120] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0121] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal management system for an electric vehicle, characterized in that: include: Oil circulation system, refrigerant circulation system and coolant circulation system; The oil circulation system includes: an oil cooler; The refrigerant circulation system includes: a first condenser, a second condenser, an evaporator and a heat exchanger that are connected to each other, and the first condenser and the evaporator are both connected to the passenger compartment of the electric vehicle; The coolant circulation system includes six passages, a first three-way valve is provided in a first passage, the first passage is divided into a first branch and a second branch by the first three-way valve, a radiator is provided in the first branch, a first water pump and the oil cooler are provided in the second passage, a second water pump and the heat exchanger are provided in the third passage, a heater core is provided in the fourth passage, the heater core is connected to the passenger compartment of the electric vehicle, a third water pump and a battery pack are provided in the fifth passage, and the second condenser is provided in the sixth passage; The six passages are connected by a valve group so that at least two passages are connected; the first passage, the third passage, the second passage and the fourth passage are connected in series to form a loop; Or, the first passage, the sixth passage, the fifth passage, the third passage, the second passage, and the fourth passage are connected in series to form a loop; Alternatively, the first passage, the sixth passage, the second passage, and the fourth passage are connected in series to form a loop.

2. The electric vehicle thermal management system according to claim 1, characterized in that: The refrigerant circulation system further includes: a compressor, a second three-way valve; After the compressor is connected to the second three-way valve, it is divided into a third branch and a fourth branch. The first condenser is provided on the third branch, and the second condenser is provided on the fourth branch. The third branch and the fourth branch are connected to the compressor after merging.

3. The electric vehicle thermal management system according to claim 2, characterized in that: The refrigerant circulation system further includes: a first expansion valve and a second expansion valve; The third branch and the fourth branch are divided into a fifth branch and a sixth branch after merging. The first expansion valve and the evaporator are provided on the fifth branch, and the second expansion valve and the heat exchanger are provided on the sixth branch. The fifth branch and the sixth branch are connected to the compressor after merging.

4. The electric vehicle thermal management system according to any one of claims 1 to 3, characterized in that: Also includes: a third three-way valve and a first control unit; The third three-way valve and the first control unit are arranged in the fifth passage, and the fifth passage is divided into a seventh branch and an eighth branch through the third three-way valve. The first control unit is located on the seventh branch, and the battery pack is located on the eighth branch.

5. The electric vehicle thermal management system according to any one of claims 1 to 3, characterized in that: Also includes: A second control unit is provided in the second passage.

6. The electric vehicle thermal management system according to claim 2 or 3, characterized in that: Also includes: A muffler is provided between the compressor and the second three-way valve.

7. The electric vehicle thermal management system according to any one of claims 2 or 3, characterized in that: Also includes: A receiver-drier is provided adjacent to the upstream end of the compressor.

8. The electric vehicle thermal management system according to any one of claims 1 to 3, characterized in that: The oil circulation system further includes an oil pump and a driving device. The oil pump is connected to the driving device and the oil cooler to form a loop.

9. The electric vehicle thermal management system according to any one of claims 1 to 3, characterized in that: The valve group is a twelve-way valve.

10. A vehicle, characterized in that: The electric vehicle thermal management system includes any one of claims 1 to 9.

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