Electric vehicle thermal management system, electric vehicle, and control method

Abstract

The present invention provides an electric vehicle thermal management system, comprising: a water heating heat exchange system, a refrigerant heat exchange system, a motor electronically controlled heat exchange system, and a battery heat exchange system; the water heating heat exchange system is provided with a second in-vehicle heat exchanger for heating the passenger compartment; the refrigerant heat exchange system is provided with a first in-vehicle heat exchanger for cooling or heating the passenger compartment; the motor electronically controlled heat exchange system and the battery heat exchange system are thermally coupled to the refrigerant heat exchange system, respectively, and the battery heat exchange system is thermally coupled to the water heating heat exchange system. In the present invention, cooling and heating are performed by the first in-vehicle heat exchanger, and heating is performed by the second in-vehicle heat exchanger. When the heating demand is low, heating can be performed by the first in-vehicle heat exchanger. When the heating demand is normal, heating can be performed by a combination of the first in-vehicle heat exchanger and the low-power second in-vehicle heat exchanger. When the heating demand is high, heating can be performed by the high-power second in-vehicle heat exchanger. This not only meets the user's cooling and heating needs, but also reduces energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle thermal management systems, and more specifically, to an electric vehicle thermal management system, an electric vehicle, and a control method for the electric vehicle thermal management system. Background Art

[0002] At present, electric vehicles have become the trend of automobile development, and the temperature control of the passenger compartment in the vehicle directly affects the passenger experience.

[0003] However, most of the HVAC (automotive HVAC is the heating, ventilation and air conditioning accessories of the vehicle) in existing vehicles are direct cooling and heating with refrigerant. The existing HVAC assembly has two refrigerant heat exchangers, one for heating and the other for cooling. This structure means that when the vehicle needs to be heated by HVAC, it can only be heated by refrigerant. However, the heating effect of refrigerant heating is poor and cannot meet low-temperature heating needs. Summary of the Invention

[0004] This application is based on the inventor's discovery and understanding of the following problems and facts: the existing HVAC assembly in the vehicle only has the first heat exchanger, which cannot meet the heating demand when high-intensity heating is required.

[0005] The present invention aims to solve one of the above technical problems at least to a certain extent.

[0006] According to a first aspect of the present disclosure, there is provided an electric vehicle thermal management system comprising a water heating heat exchange system, a refrigerant heat exchange system, a motor and electronic control heat exchange system, and a battery heat exchange system;

[0007] The refrigerant heat exchange system forms a refrigerant circulation flow path, on which a first plate heat exchanger, a first in-vehicle heat exchanger, and a second plate heat exchanger are arranged. When the refrigerant heat exchange system is in cooling operation, the first plate heat exchanger serves as a condenser, and the first in-vehicle heat exchanger and the second plate heat exchanger serve as evaporators. When the refrigerant heat exchange system is in heating operation, the first plate heat exchanger serves as a condenser, the first in-vehicle heat exchanger and the second plate heat exchanger serve as condensers, and the first plate heat exchanger serves as an evaporator. The first in-vehicle heat exchanger is arranged in the passenger compartment.

[0008] The water heating heat exchange system is formed with a first water circulation flow path, a heater and a second in-vehicle heat exchanger are provided on the water circulation flow path, the heater is used to heat the first water circulation flow path, and the second in-vehicle heat exchanger is arranged in the passenger compartment to utilize the heat of the first water circulation flow path to heat the passenger compartment; wherein the second in-vehicle heat exchanger is arranged in the passenger compartment;

[0009] The battery heat exchange system is thermally coupled to the refrigerant heat exchange system via the second plate heat exchanger. The battery heat exchange system forms a second water circulation path. The second water circulation path circulates through the battery device and the second plate heat exchanger, and can release the heat of the motor and electronic control device absorbed by the second plate heat exchanger from the second water circulation path to the refrigerant path flowing through the second plate heat exchanger.

[0010] The motor electronically controlled heat exchange system is thermally coupled to the refrigerant heat exchange system through the first plate heat exchanger. The motor electronically controlled heat exchange system is provided with a third water circulation flow path. The third water circulation flow path circulates through the motor electronically controlled equipment and the first plate heat exchanger and can release the heat of the motor electronically controlled equipment absorbed by the first plate heat exchanger from the third water circulation flow path to the refrigerant flow path flowing through the first plate heat exchanger.

[0011] In some embodiments, the battery heat exchange system is further provided with a first three-way valve and a second three-way valve, wherein the first and second ports of the first three-way valve are connected to the second water circulation flow path between the first plate heat exchanger and the battery equipment, and the first and second ports of the second three-way valve are connected to the second water circulation flow path between the first plate heat exchanger and the battery equipment. The battery heat exchange system is further provided with a bypass flow path, one end of which is connected to the third port of the first three-way valve, and the other end is connected to the third port of the second three-way valve.

[0012] In some embodiments, the first water circulation flow path of the water heating heat exchange system and the second water circulation flow path of the battery heat exchange system are coupled together through a first water four-way valve, two ports of the first water four-way valve are respectively connected to the bypass flow path, and the other two ports of the first water four-way valve are respectively connected to the first water flow path.

[0013] In some embodiments, the refrigerant heat exchange system is further provided with a compressor, a refrigerant four-way valve, and a first electronic expansion valve, a second electronic expansion valve, and a third electronic expansion valve, wherein the second plate heat exchanger and the second electronic expansion valve are connected in series to form a first refrigerant branch; the first heat exchanger in the vehicle and the third electronic expansion valve are connected in series to form a second refrigerant branch; wherein the second electronic expansion valve is used to throttle and cool the refrigerant flowing out of the second plate heat exchanger during heating, and the third electronic expansion valve is used to throttle and cool the refrigerant flowing out of the first plate heat exchanger during cooling;

[0014] The first refrigerant branch and the second refrigerant branch are connected in parallel to the first plate heat exchanger, the compressor, and the refrigerant four-way valve to form a refrigerant circulation loop; wherein:

[0015] The refrigerant four-way valve is provided with a first port, a second port, a third port, and a fourth port;

[0016] The first port of the refrigerant four-way valve is connected to the compressor, the second port of the refrigerant four-way valve is connected to the second plate heat exchanger and the first heat exchanger in the vehicle, the third port of the refrigerant four-way valve is connected to the outlet of the compressor, and the fourth port of the refrigerant four-way valve is connected to the refrigerant inlet of the first plate heat exchanger.

[0017] In some embodiments, a gas-liquid separator is provided between the compressor and the refrigerant four-way valve;

[0018] The inlet of the gas-liquid separator is connected to the first port of the refrigerant four-way valve, and the air outlet of the gas-liquid separator is connected to the air inlet of the compressor.

[0019] In some embodiments, the electric vehicle thermal management system further includes: a flasher having a first inlet, a second inlet, and an outlet;

[0020] The compressor has a first air inlet and a second air inlet;

[0021] The gas outlet of the gas-liquid separator is communicated with the first gas inlet of the compressor, the gas outlet of the flasher is communicated with the second gas inlet of the compressor, the first inlet of the flasher is communicated with the first electronic expansion valve, and the second inlet of the flasher is communicated with the second electronic expansion valve and the third electronic expansion valve respectively;

[0022] Wherein, a solenoid valve is provided between the flasher and the compressor.

[0023] In some embodiments, a controller is electrically connected to the first water four-way valve, the second electronic expansion valve, the third electronic expansion valve, the first water four-way valve, the first three-way valve, the second three-way valve, and the second water four-way valve respectively;

[0024] Among them, the controller can control the switching of water heating heat exchange and refrigerant heat exchange through the first water four-way valve, the second electronic expansion valve and the third electronic expansion valve. The controller can control the switching of refrigerant heat exchange and water heating heat exchange of the battery heat exchange system through the first water four-way valve, the first three-way valve, the second three-way valve, the second electronic expansion valve and the third electronic expansion valve. The controller can control the motor electronic control heat exchange system to cool the motor electronic control while cooling the first plate heat exchanger or heating the first cold plate heat exchanger through the second water four-way valve.

[0025] In some embodiments, it further includes:

[0026] When cooling the passenger compartment, the first electronic expansion valve has a certain opening, the solenoid valve is in a closed state, and the second electronic expansion valve is in a closed state;

[0027] When cooling the battery, the third electronic expansion valve is in a closed state, and the second electronic expansion valve has a certain opening degree;

[0028] When the passenger compartment and the battery are cooled together, the second electronic expansion valve and the third electronic expansion valve are both in the open state, and the opening degrees of the second electronic expansion valve and the third electronic expansion valve are changed according to the ratio of the passenger compartment load to the battery load.

[0029] When the refrigerant heat exchange system heats the passenger compartment alone, the third electronic expansion valve has a certain opening, the solenoid valve is in an open state, and the second electronic expansion valve is in a closed state;

[0030] When the water heating heat exchange system heats the passenger compartment alone, the water heating heater operates at full power;

[0031] When the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment, the water heating heater is working, the first electronic expansion valve has a certain opening, the solenoid valve is in an open state, and the second electronic expansion valve is in a closed state.

[0032] According to an embodiment of the second aspect of the present invention, there is provided an electric vehicle, comprising: the aforementioned electric vehicle thermal management system.

[0033] According to an embodiment of a third aspect of the present invention, a control method for a thermal management system of an electric vehicle is provided, comprising: controlling a refrigerant heat exchange system and a water heating heat exchange system according to a heating demand of a passenger compartment.

[0034] In some embodiments, adjusting the switches of the refrigerant heat exchange system and the water heating heat exchange system according to the heating demand of the passenger compartment includes:

[0035] Obtain the ambient temperature of the passenger compartment;

[0036] If the ambient temperature is higher than -10°C, the refrigerant heat exchange system will be operated to heat the passenger compartment;

[0037] If the ambient temperature is between -10℃ and -20℃, the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment;

[0038] If the ambient temperature is lower than -20℃, the water heating system will be operated to heat the passenger compartment.

[0039] According to the HAVC assembly of the embodiment of the present invention, cooling and heating can be performed through the first heat exchanger in the vehicle, and heating can be performed through the second heat exchanger in the vehicle. The first heat exchanger in the vehicle and the second heat exchanger in the vehicle are combined with each other. When cooling is needed, cooling can be performed through the first heat exchanger in the vehicle. When the heating demand is low, heating can be performed through the first heat exchanger in the vehicle. When the heating demand is general, mixed heating can be performed through the first heat exchanger in the vehicle and the second heat exchanger in the vehicle running at low power. When the heating demand is high, heating can be performed entirely through the second heat exchanger in the vehicle running at high power. This can not only meet the user's cooling and heating needs, but also reduce energy consumption.

[0040] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of a thermal management system for an electric vehicle according to the present invention;

[0042] Figure 2 is a system schematic diagram of a thermal management system for an electric vehicle according to the present invention when cooling a passenger compartment;

[0043] Figure 3 2. It is a schematic diagram of a thermal management system for an electric vehicle according to the present invention when cooling a battery;

[0044] Figure 4 is a system schematic diagram of a thermal management system for an electric vehicle according to the present invention when cooling a passenger compartment and a battery;

[0045] Figure 5 is a schematic diagram of a system when the refrigerant heat exchange system according to the present invention heats the passenger compartment alone;

[0046] Figure 6 2. It is a schematic diagram of a system when the water heating heat exchange system according to the present invention heats the passenger compartment alone;

[0047] Figure 7 2. It is a schematic diagram of a system in which a refrigerant heat exchange system and a water heating heat exchange system are combined to heat a passenger compartment according to the present invention;

[0048] Figure 8 is a schematic diagram of a refrigerant heat exchange system according to the present invention when heating a battery;

[0049] Figure 9 is a schematic diagram of a water heating heat exchange system according to the present invention when heating a battery;

[0050] Figure 102. This is a schematic diagram of a system in which a refrigerant heat exchange system and a water heating heat exchange system are combined to heat a battery according to the present invention;

[0051] Figure 11 2. This is a schematic diagram of a water heating heat exchange system according to the present invention when heating the passenger compartment and the battery simultaneously;

[0052] Figure 12 2. This is a schematic diagram of a system in which a refrigerant heat exchange system and a water heating heat exchange system are combined to heat the passenger compartment and the battery when the battery heat demand is low and the passenger compartment heat demand is high according to the present invention;

[0053] Figure 13 This is a system schematic diagram of a case where the refrigerant heat exchange system and the water heating heat exchange system are mixed to heat the passenger compartment and the battery when the battery heat demand and the passenger compartment heat demand are high according to the present invention.

[0054] Reference numerals

[0055] 1. Compressor; 2. Solenoid valve; 3. Refrigerant four-way valve; 4. Gas-liquid separator; 5. Flasher; 6. First electronic expansion valve; 7. First plate heat exchanger; 8. Second electronic expansion valve; 9. Third electronic expansion valve; 10. HAVC assembly; 101. First heat exchanger in the vehicle; 102. Second heat exchanger in the vehicle; 103. In-vehicle fan; 11. First water pump; 12. Water heater; 13. First water four-way valve; 14. First three-way valve; 15. Battery; 16. First water tank; 17. Second water pump; 18. Second three-way valve; 19. Second plate heat exchanger; 20. Motor and electronic control; 21. Second water tank; 22. Third water pump; 23. Second water four-way valve; 24. Water-cooled heat exchanger; 25. External fan. DETAILED DESCRIPTION

[0056] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0057] Throughout the specification and claims, the following terms have at least the meanings explicitly associated herein, unless the context dictates otherwise. The meanings identified below do not necessarily limit the terms, but merely provide illustrative examples of the terms.

[0058] In the description of the present invention, the phrase "in a first embodiment" does not necessarily refer to the same embodiment, although it may. Similarly, the phrase "in some embodiments," as used herein, when used multiple times, does not necessarily refer to the same embodiment, although it may. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or" unless the context clearly dictates otherwise. The term "based on" is not exclusive and allows for being based on additional factors not described unless the context clearly dictates otherwise. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The scope of the present invention is limited solely by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting but merely illustrative of some of the many possible embodiments of the claimed invention. The various embodiments provided herein should not be construed as limiting the scope of the invention.

[0059] 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", "clockwise", "counterclockwise" 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.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include the first or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0061] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0062] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0063] At present, electric vehicles have become the trend of automobile development. Unlike fuel vehicles, electric vehicles need to control the temperature of the battery, and at the same time, they must comprehensively meet the load requirements of the cockpit and motor electronic control.

[0064] Numerous technical experts have proposed numerous solutions for the comprehensive thermal management of electric vehicle passenger compartments, motors, electronic controls, and batteries. However, most existing HVAC solutions rely on direct cooling and heating with refrigerants and lack a water heating system. This results in poor refrigerant heating performance when ambient temperatures are low and heating demand is high, impacting the user experience.

[0065] Based on this, Figures 1-13 As shown, the HAVC assembly according to an embodiment of the present invention includes: a first heat exchanger in the vehicle, the first heat exchanger in the vehicle is used for cooling or heating;

[0066] A second heat exchanger in the vehicle, the second heat exchanger in the vehicle being arranged opposite to the first heat exchanger in the vehicle, and the second heat exchanger in the vehicle being used for heating;

[0067] The in-vehicle fan is located between the first in-vehicle heat exchanger and the second in-vehicle heat exchanger, the air outlet and air inlet of the fan correspond to the first in-vehicle heat exchanger and the second in-vehicle heat exchanger respectively, or the air outlet and air inlet of the fan correspond to the second in-vehicle heat exchanger and the first in-vehicle heat exchanger respectively.

[0068] Specifically, the HAVC assembly can exchange heat in the passenger compartment and adjust the temperature in the passenger compartment. The refrigerant can circulate inside the first heat exchanger in the vehicle, and the passenger compartment can be cooled or heated through the first heat exchanger in the vehicle. Water can circulate inside the second heat exchanger in the vehicle, and the passenger compartment can be heated. The fan in the vehicle can be set to suck and blow air. The fan in the vehicle is set between the second heat exchanger in the vehicle and the first heat exchanger in the vehicle, and can transport the gas generated by the second heat exchanger in the vehicle and / or the first heat exchanger in the vehicle to the passenger compartment. The fan in the vehicle can be set to multiple gears, and different gears have different blowing intensities, so that users in the passenger compartment can adjust the cold air or hot air intensity.

[0069] According to the HAVC assembly of the embodiment of the present invention, cooling and heating can be performed through the first heat exchanger in the vehicle, and heating can be performed through the second heat exchanger in the vehicle. The first heat exchanger in the vehicle and the second heat exchanger in the vehicle are combined with each other. When cooling is needed, cooling can be performed through the first heat exchanger in the vehicle. When the heating demand is low, heating can be performed through the first heat exchanger in the vehicle. When the heating demand is general, mixed heating can be performed through the first heat exchanger in the vehicle and the second heat exchanger in the vehicle running at low power. When the heating demand is high, heating can be performed entirely through the second heat exchanger in the vehicle running at high power. This can not only meet the user's cooling and heating needs, but also reduce energy consumption.

[0070] Example 2

[0071] like Figures 1-13 As shown, the embodiment of the present application also provides an electric vehicle thermal management system, including: a water heating heat exchange system, a refrigerant heat exchange system and a HAVC assembly 10;

[0072] The water heating heat exchange system and the refrigerant heat exchange system share a HVAC assembly 10 .

[0073] Specifically, water can be circulated in the water heating heat exchange system, and refrigerant can be circulated in the refrigerant heat exchange system. The water heating heat exchange system and the refrigerant heat exchange system share a HAVC assembly 10, and can be connected to the second heat exchanger 102 and the first heat exchanger 101 in the vehicle in the HAVC assembly 10 respectively. The water heating heat exchange system heats the passenger compartment by circulating water, and the refrigerant heat exchange system cools or heats the passenger compartment by circulating refrigerant, which can effectively regulate the temperature in the passenger compartment, so that users in the passenger compartment can be in a comfortable environment, thereby improving the user experience.

[0074] In some embodiments, the motor electronically controlled heat exchange system and the battery heat exchange system are thermally coupled with the refrigerant heat exchange system respectively, and the battery heat exchange system is also thermally coupled with the water heating heat exchange system.

[0075] Specifically, the motor electronic control heat exchange system can cool the motor electronic control 20, and the battery heat exchange system can cool or heat up the vehicle battery 15. The motor electronic control 20 is also thermally coupled with the refrigerant heat exchange system. When the refrigerant heat exchange system is cooling, the low-temperature water in the motor electronic control heat exchange system can be directly used to take away the heat of the refrigerant in the refrigerant heat exchange system. When the refrigerant heat exchange system is heating, the heat generated by the motor electronic control 20 can also be used to heat the refrigerant. The battery heat exchange system is thermally coupled with the refrigerant heat exchange system and the water heating heat exchange system respectively. The refrigerant heat exchange system can be used to cool the battery 15 and the water heating heat exchange system can be used to heat the battery 15, so that the battery 15 is in a good operating environment and the service life of the battery 15 is improved.

[0076] In some embodiments, the refrigerant heat exchange system includes: a compressor 1, a refrigerant four-way valve 3, a solenoid valve 2, a gas-liquid separator, a HAVC assembly 10, a first electronic expansion valve 6, a third electronic expansion valve 9, a flasher 5, a first plate heat exchanger 7, a gas-liquid separator 4, a second plate heat exchanger 19, and a second electronic expansion valve 8;

[0077] Among them, the outlet of the first in-vehicle heat exchanger 101 of the HAVC assembly 10 is connected to the third electronic expansion valve 9, and the outlet of the third electronic expansion valve 9 is respectively connected to the inlet of the second electronic expansion valve 8 and the inlet of the flasher 5. The outlet of the second electronic expansion valve 8 is connected to the inlet of the second plate heat exchanger 19, and the outlet of the second plate heat exchanger 19 is connected to the inlet of the first in-vehicle heat exchanger 101. The first outlet of the flasher 5 is connected to the inlet of the solenoid valve 2, and the outlet of the solenoid valve 2 is connected to the first inlet of the compressor 1. The second outlet of the flasher 5 is connected to the inlet of the first electronic expansion valve 6, and the outlet of the first electronic expansion valve 6 is connected to the inlet of the first plate heat exchanger 7. The outlet of the first plate heat exchanger 7 is connected to the first inlet of the refrigerant four-way valve 3, and the first outlet of the refrigerant four-way valve 3 is connected to the gas-liquid separator 4. The outlet of the gas-liquid separator 4 is connected to the second inlet of the compressor 1. The outlet of the compressor 1 is connected to the second inlet of the refrigerant four-way valve 3, and the second outlet of the refrigerant four-way valve 3 is connected to the inlet of the first in-vehicle heat exchanger 101.

[0078] The first plate heat exchanger 7 is thermally coupled to the motor electronic control heat exchange system, and the second plate heat exchanger 19 is thermally coupled to the battery heat exchange system.

[0079] Specifically, the refrigerant heat exchange system is thermally coupled with the motor electronically controlled heat exchange system through the first plate heat exchanger 7, and the motor electronically controlled heat exchange system can be used to cool down or heat up the refrigerant in the refrigerant heat exchange system. The refrigerant heat exchange system is thermally coupled with the battery heat exchange system through the second plate heat exchanger 19, and the refrigerant can quickly take away the heat in the battery heat exchange system to cool down the battery 15.

[0080] In some embodiments, the water heating heat exchange system includes: an HVAC assembly 10, a first water pump 11, a water heating heater 12 and a first water four-way valve 13;

[0081] The outlet of the second heat exchanger 102 in the vehicle of the HAVC assembly 10 is connected to the inlet of the first water pump 11, the outlet of the first water pump 11 is connected to the inlet of the water heater 12, the outlet of the water heater 12 is connected to the first inlet of the first water four-way valve 13, and the first outlet of the first water four-way valve 13 is connected to the inlet of the second heat exchanger 102 in the vehicle;

[0082] The first water four-way valve 13 is also connected to the battery heat exchange system.

[0083] Specifically, the water heating heat exchange system can heat water through the water heating heater 12, and then bring the heat to the second heat exchanger 102 in the vehicle through the water, bringing a large amount of heat to the passenger compartment, increasing the temperature of the passenger compartment, and heating the passenger compartment. At the same time, the water heating heat exchange system is also connected to the battery heat exchange system through the first water four-way valve 13, and can also bring heat to the battery heat exchange system through water to heat the battery 15.

[0084] In some embodiments, the battery heat exchange system includes: a second plate heat exchanger 19, a second three-way valve 18, a second water pump 17, a first water tank 16, a heat exchange pipeline for the battery 15, a first water four-way valve 13, and a first three-way valve 14;

[0085] The second outlet of the second plate heat exchanger 19 is connected to the second three-way valve 18, the first outlet of the second three-way valve 18 is connected to the second water pump 17, the outlet of the second water pump 17 is connected to the inlet of the first water tank 16, the outlet of the first water tank 16 is connected to the inlet of the heat exchange pipeline of the battery 15, the outlet of the heat exchange pipeline of the battery 15 is connected to the first inlet of the first three-way valve 14, and the outlet of the first three-way valve 14 is connected to the second inlet of the second plate heat exchanger 19;

[0086] The second outlet of the second three-way valve 18 is also connected to the second inlet of the first water four-way valve 13 , and the second outlet of the first water four-way valve 13 is connected to the second inlet of the first three-way valve 14 .

[0087] Specifically, the battery heat exchange system circulates water in the heat exchange pipeline of the battery 15 to adjust the temperature of the battery 15. When the temperature of the battery 15 is high, the heat of the battery 15 can be taken away by the circulating water, and the temperature of the circulating water can be lowered by the refrigerant heat exchange system. When the temperature of the battery 15 is low, the circulating water can be heated by the water heating heat exchange system, and then the heat can be brought to the battery 15 by the circulating water to heat the battery 15.

[0088] In some embodiments, the motor-controlled heat exchange system includes: a first plate heat exchanger 7, a motor-controlled heat exchanger 20, a second water tank 21, a third water pump 22, a second water four-way valve 23, a water-cooled heat exchanger 24, and an external fan 25;

[0089] Among them, the second outlet of the first plate heat exchanger 7 is connected to the inlet of the water-cooled heat exchanger 24, the outlet of the water-cooled heat exchanger 24 is connected to the first inlet of the second water four-way valve 23, the first outlet of the second water four-way valve 23 is connected to the inlet of the third water pump 22, the outlet of the third water pump 22 is connected to the second inlet of the second water four-way valve 23, the second outlet of the second water four-way valve 23 is connected to the inlet of the second water tank 21, the outlet of the second water tank 21 is connected to the inlet of the heat exchange pipeline of the motor and electronic control 20, the outlet of the heat exchange pipeline of the motor and electronic control 20 is connected to the second inlet of the first plate heat exchanger 7, and the air outlet of the outdoor fan 25 corresponds to the water-cooled heat exchanger 24.

[0090] Specifically, the motor and electronic control heat exchange system can cool down the motor and electronic control 20 through circulating water and the water-cooled heat exchanger 24, so that the motor and electronic control 20 can operate normally. It can also take away the heat of the refrigerant in the refrigerant heat exchange system through the circulating water to ensure the cooling effect of the refrigerant heat exchange system. When the refrigerant heat exchange system is heating, the circulation direction of the circulating water in the motor and electronic control heat exchange system can be adjusted through the second water four-way valve 23, so that the motor and electronic control 20 system can bring the heat generated by the motor and electronic control 20 to the refrigerant heat exchange system to ensure the heating effect of the refrigerant heat exchange system.

[0091] In some embodiments, it further includes:

[0092] A controller is electrically connected to the first water four-way valve 13, the second electronic expansion valve 8, the third electronic expansion valve 9, the first water four-way valve 13, the first three-way valve 14, the second three-way valve 18, and the second water four-way valve 23;

[0093] Among them, the controller can control the switching of water heating heat exchange and refrigerant heat exchange through the first water four-way valve 13, the second electronic expansion valve 8 and the third electronic expansion valve 9. The controller can control the switching of refrigerant heat exchange and water heating heat exchange of the battery heat exchange system through the first water four-way valve 13, the first three-way valve 14, the second three-way valve 18, the second electronic expansion valve 8 and the third electronic expansion valve 9. The controller can control the motor electronic control heat exchange system to cool the motor electronic control 20 while cooling the first plate heat exchanger 7 or heating the first cold plate heat exchanger through the second water four-way valve 23.

[0094] Specifically, such as Figure 2When cooling the passenger compartment, the refrigerant circulation system maintains a certain opening for the first electronic expansion valve 6, a closed solenoid valve 2, and a closed second electronic expansion valve 8. After being compressed by the compressor 1, the refrigerant enters the first plate heat exchanger 7. The high-temperature refrigerant is throttled by the flash igniter 5 and the third electronic expansion valve 9 before entering the first heat exchanger 101 inside the vehicle, where it evaporates and absorbs heat. Finally, it flows back to the compressor 1 through the refrigerant four-way valve 3 and the gas-liquid separator 4, completing the refrigeration cycle. Regarding the water circulation system, the high-temperature aqueous solution exchanged by the first plate heat exchanger 7 passes through the motor control 20, the second water tank 21, the third water pump 22, and the second water four-way valve 23 and enters the water-cooled heat exchanger 24. The heat is dissipated to the surrounding environment by the external fan. Furthermore, when the motor control 20 requires heat dissipation, this can be achieved synchronously.

[0095] like Figure 3 As shown, when the vehicle battery 15 is cooled, the refrigerant circulation and the heat exchange circulation flow with the external environment are consistent with the passenger compartment cooling operation. At this time, the third electronic expansion valve 9 is in a closed state, and the refrigerant enters the first plate heat exchanger 7 through the throttling effect of the second electronic expansion valve 8 to evaporate and absorb heat. The cooled low-temperature aqueous solution passes through the second three-way valve 18, the second water pump 17, and the first water tank 16 to cool the battery 15, and then flows back to the first plate heat exchanger 7 through the first three-way valve 14 to continue heat exchange to form a battery 15 cooling cycle.

[0096] like Figure 4 As shown, when providing passenger compartment cooling and battery 15 cooling at the same time, the passenger compartment cooling and battery 15 cooling schemes are combined. At this time, the second electronic expansion valve 8 and the third electronic expansion valve 9 are both in the open state, and the opening size of the two can be appropriately adjusted according to the proportional requirements of the passenger compartment load and the battery 15 load.

[0097] like Figure 5As shown, when heating the passenger compartment, if the ambient temperature is not very low (generally above -10°C), the refrigerant heat exchange system can be operated for heating. In this case, the third electronic expansion valve 9 is opened to a certain degree, the solenoid valve 2 is open, and the second electronic expansion valve 8 is closed. After being compressed by the compressor 1, the refrigerant, after being switched by the refrigerant four-way valve 3, flows into the first in-vehicle heat exchanger 101 within the HVAC assembly 10, releasing heat. It is then throttled once by the third electronic expansion valve 9 and partially evaporated in the flash evaporator 5. The supercooled liquid refrigerant continues to be throttled by the first electronic expansion valve 6, evaporates in the first plate heat exchanger 7, and absorbs heat. Finally, it flows back to the compressor 1 through the refrigerant four-way valve 3 and the gas-liquid separator 4. Simultaneously, the vaporized refrigerant in the flash evaporator 5 flows into the intermediate-pressure side of the compressor 1, replenishing air and increasing enthalpy, thereby increasing heating capacity. For the water system that exchanges heat with the outside environment, the second water four-way valve 23 switches the flow direction. If the motor electronic control 20 needs to dissipate heat, the refrigerant will carry its heat into the first plate heat exchanger 7, so that heat can be recycled.

[0098] like Figure 6 As shown, when the ambient temperature is very low (generally below -20°C) and the refrigerant heat exchange system cannot work normally, heating is provided by the water heating heat exchange system, and the water heating heater 12 starts working. When the passenger compartment needs to be heated, the high-temperature aqueous solution heated by the water heating heater 12 releases heat in the second heat exchanger 102 in the vehicle, and then flows back to the water heating heater 12 through the first water pump 11 for heat exchange, forming a water heating cycle.

[0099] like Figure 7 As shown, the combined refrigerant heat exchange system and water heating system provide heating to the passenger compartment. When the vehicle's heating load is at a normal value (typically -20°C to -10°C), the refrigerant heat exchange system alone cannot meet the passenger compartment's needs, and the water heating system alone consumes a lot of power. In this case, the refrigerant heat exchange system and the water heating system can be used together to provide heating. The circulating air in the HVAC assembly 10 is initially heated by the first heat exchanger 101 in the vehicle, and then reheated by the water heater 12 before being delivered to the passenger compartment. The water heater 12 does not need to operate at maximum power, and a certain amount of heat can be supplemented by the heat pump circulation. This hybrid mode achieves the dual goals of heating efficiency and energy conservation.

[0100] Similarly, if Figure 8 and Figure 9 As shown, a heating scheme for the refrigerant heat exchange system and the water heating heat exchange system when the battery 15 is heated is given. By switching and adjusting the first water four-way valve 13, the first three-way valve 14 and the second three-way valve 18, the heating heat source of the battery 15 can be switched between the first plate heat exchanger 7 and the water heating heater 12 to meet different heat requirements.

[0101] like Figure 10As shown, the operation scheme of the refrigerant heat exchange system and the water heating heat exchange system when the passenger compartment and the battery 15 have heating requirements at the same time is given. It is the accumulation of the heating of the refrigerant heat exchange system of the passenger compartment and the heating of the refrigerant heat exchange system of the battery 15, which is similar to the above and will not be repeated.

[0102] like Figure 11 As shown, the passenger compartment heating + battery 15 heating adopts the water heating heat exchange system heating solution, the circulation and Figure 1 The difference is that at this time, there is a need for heating in the vehicle, and the aqueous solution heated to the battery 15 continues to release heat in the second heat exchanger 102 in the vehicle. In particular, the heat flows through the battery 15 first, and then flows through the second heat exchanger 102 in the vehicle, so as to prioritize the thermal demand of the battery 15.

[0103] like Figure 12 and Figure 13 As shown, two hybrid heating solutions are provided, namely, a refrigerant heat exchange system for heating the passenger compartment + battery 15 and a water heating heat exchange system. Figure 12 It is applicable to the situation where the heat demand of the battery 15 is low while the heat demand of the passenger compartment is high. At this time, the heat of the battery 15 comes from part of the heat generated by the heat pump, and the heat of the passenger compartment comes from part of the heat generated by the heat pump and the heat generated by the water heater 12, thereby ensuring the best condition of the battery 15 while meeting the needs of the passenger compartment to the greatest extent possible. Figure 13 The water heater 12 and the second heat exchanger 102 in the vehicle are connected in series on the same flow path, which is suitable for situations where the heat demand of the battery 15 and the heat demand of the passenger compartment are both high. At this time, the heat of the battery 15 comes entirely from the water heater 12, and its remaining heat and the heat generated by the heat pump cycle are jointly sent into the passenger compartment by the first heat exchanger 101 and the second heat exchanger 102 in the vehicle, thereby maximizing and optimizing the distribution of heat demand.

[0104] Example 3

[0105] An embodiment of the present application also provides an electric vehicle, including: the aforementioned electric vehicle thermal management system.

[0106] Specifically, the electric vehicle thermal management system proposed in this application can be used to comprehensively manage the thermal performance of the electric vehicle passenger compartment, motor and electronic control 20, and battery 15, so that the refrigerant heat exchange system, water heating heat exchange system, battery heat exchange system, and motor and electronic control heat exchange system can be interconnected to meet customer needs, ensure the normal operation of the vehicle, and improve energy utilization.

[0107] Example 4

[0108] The present application also provides a method for controlling a thermal management system of an electric vehicle, comprising: controlling a refrigerant heat exchange system and a water heating heat exchange system according to heating requirements of a passenger compartment;

[0109] Specifically, the heating demand of the passenger compartment can be judged based on the temperature inside the passenger compartment or the ambient temperature outside the passenger compartment. When the heating demand is small, the refrigerant heat exchange system can be directly turned on for heating. When the heating demand is average, the refrigerant heat exchange system and the water heating heat exchange system can be used for mixed heating. At this time, the water heating heat exchange system can operate at low power. When the heating demand is high, the water heating heat exchange system can be operated at high power.

[0110] It can save energy, reduce heating costs and improve the endurance of electric vehicles while meeting the heating needs of the passenger compartment.

[0111] In some embodiments, adjusting the on / off of the refrigerant heat exchange system and the water heating heat exchange system according to the heating demand of the passenger compartment includes:

[0112] Obtain the ambient temperature of the passenger compartment;

[0113] If the ambient temperature is higher than -10°C, the refrigerant heat exchange system will be operated to heat the passenger compartment;

[0114] If the ambient temperature is between -10℃ and -20℃, the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment;

[0115] If the ambient temperature is lower than -20℃, the water heating system will be operated to heat the passenger compartment.

[0116] Specifically, the heating demand required for the passenger compartment can be determined based on the ambient temperature of the passenger compartment. When the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment, the water heating heat exchange system can operate at low power to reduce energy consumption. In the description of this specification, the reference terms "first embodiment", "some embodiments", "example", "specific example", or "some examples" and the like are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least the first embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any first or multiple embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0117] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thermal management system for an electric vehicle, characterized in that: Including water heating heat exchange system, refrigerant heat exchange system, motor electronic control heat exchange system and battery heat exchange system; The refrigerant heat exchange system forms a refrigerant circulation flow path, and a first plate heat exchanger (7), a first in-vehicle heat exchanger (101), and a second plate heat exchanger (19) are arranged on the refrigerant circulation flow path. When the refrigerant heat exchange system is in cooling operation, the first plate heat exchanger (7) serves as a condenser, and the first in-vehicle heat exchanger (101) and the second plate heat exchanger (19) serve as evaporators. When the refrigerant heat exchange system is in heating operation, the first plate heat exchanger (7) serves as a condenser, the first in-vehicle heat exchanger (101) and the second plate heat exchanger (19) serve as a condenser, and the first plate heat exchanger (7) serves as an evaporator. The first in-vehicle heat exchanger (101) is arranged in the passenger compartment. The water heating heat exchange system is formed with a first water circulation flow path, a heater and a second in-vehicle heat exchanger (102) are provided on the water circulation flow path, the heater is used to heat the first water circulation flow path, and the second in-vehicle heat exchanger (102) is arranged in the passenger compartment to use the heat of the first water circulation flow path to heat the passenger compartment; wherein the second in-vehicle heat exchanger (102) is arranged in the passenger compartment; The battery heat exchange system is thermally coupled to the refrigerant heat exchange system through the second plate heat exchanger (19), and the battery heat exchange system forms a second water circulation flow path. The second water circulation flow path circulates through the battery device and the second plate heat exchanger (19), and can release the heat of the motor and electronic control device absorbed by the second plate heat exchanger (19) from the second water circulation flow path to the refrigerant flow path flowing through the second plate heat exchanger (19); The motor electronically controlled heat exchange system is thermally coupled to the refrigerant heat exchange system through the first plate heat exchanger (7). The motor electronically controlled heat exchange system is provided with a third water circulation flow path. The third water circulation flow path circulates through the motor electronically controlled equipment and the first plate heat exchanger (7) and can release the heat of the motor electronically controlled equipment absorbed by the first plate heat exchanger (7) from the third water circulation flow path to the refrigerant flow path flowing through the first plate heat exchanger (7).

2. The electric vehicle thermal management system according to claim 1, characterized in that: The battery heat exchange system is further provided with a first three-way valve (14) and a second three-way valve (18), wherein the first and second ports of the first three-way valve (14) are connected to the second water circulation flow path between the first plate heat exchanger (7) and the battery device, and the first and second ports of the second three-way valve (18) are connected to the second water circulation flow path between the first plate heat exchanger (7) and the battery device. The battery heat exchange system is further provided with a bypass flow path, wherein one end of the bypass flow path is connected to the third port of the first three-way valve (14), and the other end is connected to the third port of the second three-way valve (18).

3. The electric vehicle thermal management system according to claim 2, characterized in that: The first water circulation flow path of the water heating heat exchange system and the second water circulation flow path of the battery heat exchange system are coupled together through a first water four-way valve (13), two ports of the first water four-way valve (13) are respectively connected to the bypass flow path, and the other two ports of the first water four-way valve (13) are respectively connected to the first water circulation flow path.

4. The electric vehicle thermal management system according to claim 3, characterized in that: The refrigerant heat exchange system is further provided with a compressor (1), a refrigerant four-way valve (3), a first electronic expansion valve (6), a second electronic expansion valve (8), and a third electronic expansion valve (9), wherein the second plate heat exchanger (19) and the second electronic expansion valve (8) are connected in series to form a first refrigerant branch; the first heat exchanger (101) in the vehicle and the third electronic expansion valve (9) are connected in series to form a second refrigerant branch; wherein the second electronic expansion valve (8) is used to throttle and cool the refrigerant flowing out of the second plate heat exchanger (19) during heating, and the third electronic expansion valve (9) is used to throttle and cool the refrigerant flowing out of the first plate heat exchanger (7) during cooling; The first refrigerant branch and the second refrigerant branch are connected in parallel to the first plate heat exchanger (7), the compressor (1), and the refrigerant four-way valve (3) to form a refrigerant circulation loop; wherein: The refrigerant four-way valve (3) is provided with a first port, a second port, a third port, and a fourth port; The first port of the refrigerant four-way valve (3) is connected to the compressor (1), the second port of the refrigerant four-way valve (3) is connected to the second plate heat exchanger (19) and the first heat exchanger (101) in the vehicle, the third port of the refrigerant four-way valve (3) is connected to the outlet of the compressor (1), and the fourth port of the refrigerant four-way valve (3) is connected to the refrigerant inlet of the first plate heat exchanger (7).

5. The electric vehicle thermal management system according to claim 4, characterized in that: A gas-liquid separator (4) is provided between the compressor (1) and the refrigerant four-way valve (3); The inlet of the gas-liquid separator (4) is connected to the first port of the refrigerant four-way valve (3), and the air outlet of the gas-liquid separator (4) is connected to the air inlet of the compressor (1).

6. The electric vehicle thermal management system according to claim 5, characterized in that: The electric vehicle thermal management system further comprises: a flasher (5), the flasher (5) having a first inlet, a second inlet and an outlet; The compressor (1) has a first air inlet and a second air inlet; The gas outlet of the gas-liquid separator (4) is communicated with the first gas inlet of the compressor (1), the gas outlet of the flasher (5) is communicated with the second gas inlet of the compressor (1), the first inlet of the flasher (5) is communicated with the first electronic expansion valve (6), and the second inlet of the flasher (5) is communicated with the second electronic expansion valve (8) and the third electronic expansion valve (9) respectively; Wherein, a solenoid valve (2) is provided between the flasher (5) and the compressor (1).

7. The electric vehicle thermal management system according to claim 6, characterized in that: Also includes: a controller, the controller being electrically connected to the first water four-way valve (13), the second electronic expansion valve (8), the third electronic expansion valve (9), the first water four-way valve (13), the first three-way valve (14), the second three-way valve (18), and the second water four-way valve (23); The controller is capable of controlling the switching between water heating heat exchange and refrigerant heat exchange through the first water four-way valve (13), the second electronic expansion valve (8) and the third electronic expansion valve (9); the controller is capable of controlling the switching between refrigerant heat exchange and water heating heat exchange of the battery heat exchange system through the first water four-way valve (13), the first three-way valve (14), the second three-way valve (18), the second electronic expansion valve (8) and the third electronic expansion valve (9); and the controller is capable of controlling the motor electronic control heat exchange system to cool the motor electronic control (20) while cooling the first plate heat exchanger (7) or heating the first cold plate heat exchanger through the second water four-way valve (23).

8. The electric vehicle thermal management system according to claim 7, characterized in that: Also includes: When cooling the passenger compartment, the first electronic expansion valve (6) has a certain opening, the solenoid valve (2) is in a closed state, and the second electronic expansion valve (8) is in a closed state; When cooling the battery, the third electronic expansion valve (9) is in a closed state, and the second electronic expansion valve (8) has a certain opening degree; When the passenger compartment and the battery are cooled together, the second electronic expansion valve (8) and the third electronic expansion valve (9) are simultaneously in an open state, and the opening degrees of the second electronic expansion valve (8) and the third electronic expansion valve (9) are changed according to the proportional requirements of the passenger compartment load and the battery (15) load; When the refrigerant heat exchange system heats the passenger compartment alone, the third electronic expansion valve (9) has a certain opening, the solenoid valve (2) is in an open state, and the second electronic expansion valve (8) is in a closed state; When the water heating heat exchange system heats the passenger compartment alone, the water heating heater (12) operates at full power; When the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment, the water heating heater (12) works, the first electronic expansion valve (6) has a certain opening, the solenoid valve (2) is in an open state, and the second electronic expansion valve (8) is in a closed state.

9. An electric vehicle, characterized in that: include: The electric vehicle thermal management system according to any one of claims 1 to 8.

10. A control method for an electric vehicle thermal management system, wherein the electric vehicle thermal management system is the electric vehicle thermal management system according to any one of claims 1 to 8, characterized in that: include: Control the refrigerant heat exchange system and water heating heat exchange system according to the heating demand of the passenger compartment.

11. The control method according to claim 10, characterized in that: The method of adjusting the switches of the refrigerant heat exchange system and the water heating heat exchange system according to the heating demand of the passenger compartment includes: Obtain the ambient temperature of the passenger compartment; If the ambient temperature is higher than -10°C, the refrigerant heat exchange system will be operated to heat the passenger compartment; If the ambient temperature is between -10℃ and -20℃, the refrigerant heat exchange system and the water heating heat exchange system are combined to heat the passenger compartment; If the ambient temperature is lower than -20℃, the water heating system will be operated to heat the passenger compartment.

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