A vehicle refrigeration system and method

Abstract

This invention discloses a vehicle refrigeration system and method. The vehicle refrigeration system includes an electric compressor, a condenser, a plate heat exchanger, and a passenger compartment evaporator. The electric compressor, plate heat exchanger, and passenger compartment evaporator form a first loop. The plate heat exchanger is connected to a battery pack to form a second loop. The electric compressor, condenser, and passenger compartment evaporator form a third loop. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is not higher than a first preset temperature and the battery pack outlet water temperature is not higher than a second preset temperature, the first and second loops are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is higher than the first preset temperature and the battery pack outlet water temperature is higher than the second preset temperature, the third loop is used to cool the passenger compartment. When the vehicle is parked and stationary with no oncoming wind, the heat exchange efficiency of the condenser is improved, avoiding the problems of high cooling energy consumption and insufficient cooling capacity of the entire system.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning technology, and in particular to a vehicle refrigeration system and method. Background Technology

[0002] Currently, the condensation process in the cooling cycle of pure electric vehicle cabs generally involves heat exchange between the condenser and air via an actively driven airflow from a fan. When the vehicle is in motion, the oncoming wind ensures sufficient airflow into the condenser, resulting in high efficiency throughout the cooling cycle, low energy consumption, and ample cooling capacity.

[0003] However, when the vehicle is parked and stationary, there is no oncoming wind, and the heat exchange efficiency of the condenser is poor. If the condenser is used alone for cooling, the cooling energy consumption of the entire system will be high and the cooling capacity will be insufficient. Summary of the Invention

[0004] This invention provides a vehicle refrigeration system and method to solve the technical problem in the related art that when a vehicle is parked and stationary, there is no oncoming wind, the heat exchange efficiency of the condenser is poor, and if the condenser is used alone for refrigeration, the refrigeration energy consumption of the whole system is high and the refrigeration capacity is insufficient.

[0005] In a first aspect, a vehicle cooling system is provided, comprising: Electric compressor, condenser, plate heat exchanger, passenger compartment evaporator; The electric compressor, the plate heat exchanger, and the passenger compartment evaporator form a first loop, and the plate heat exchanger is connected to the battery pack to form a second loop; The electric compressor, the condenser, and the passenger cabin evaporator form a third loop; When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is not greater than the first preset temperature, and the battery pack water outlet temperature is not greater than the second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is greater than the first preset temperature, and the battery pack outlet water temperature is greater than the second preset temperature, the third circuit is used to cool the passenger compartment.

[0006] In some embodiments, the vehicle cooling system further includes: A first solenoid valve is disposed between the electric compressor and the plate heat exchanger; The second solenoid valve is located between the plate heat exchanger and the passenger compartment evaporator. An electronic expansion valve is provided between the plate heat exchanger and the second solenoid valve; When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is not greater than the first preset temperature, and the battery pack outlet water temperature is not greater than the second preset temperature, the first solenoid valve, the second solenoid valve, and the electronic expansion valve are turned on, and the first circuit and the second circuit are used to cool the passenger compartment.

[0007] In some embodiments, the vehicle cooling system further includes: A third solenoid valve is disposed between the electric compressor and the condenser; When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is greater than the first preset temperature, and the battery pack outlet water temperature is greater than the second preset temperature, the third solenoid valve and the second solenoid valve are turned on, and the electronic expansion valve and the first solenoid valve are turned off, using the third circuit to cool the passenger compartment.

[0008] In some embodiments, the first preset temperature is 55°C to 60°C, and the second preset temperature is 40°C to 45°C.

[0009] In some embodiments, the vehicle cooling system further includes: The fourth circuit includes the electric compressor, the condenser, and the plate heat exchanger; The fifth circuit includes the electric compressor, the condenser, and the passenger compartment evaporator; When the vehicle is in motion and the passenger compartment needs to be cooled, and the vehicle speed is not less than the first preset speed, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, or when the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the fifth circuit is used to cool the passenger compartment.

[0010] In some embodiments, the vehicle cooling system further includes: The fourth solenoid valve is located between the electric compressor and the plate heat exchanger; When the vehicle speed is not less than the first preset speed, the third solenoid valve, the electronic expansion valve, and the fourth solenoid valve are turned on and the first solenoid valve is turned off, using the fourth circuit and the second circuit to cool the battery pack; the second solenoid valve is turned on, using the fifth circuit to cool the passenger compartment.

[0011] In some embodiments, when the vehicle speed is less than a first preset speed or the battery pack temperature is not greater than a third preset temperature, the electronic expansion valve is disconnected, and the second and third solenoid valves are turned on, using the fifth circuit to cool the passenger compartment.

[0012] In some embodiments, the first preset speed is 30km / h to 50km / h, and the third preset temperature is 35℃ to 37℃.

[0013] Secondly, a vehicle cooling method is provided, using the aforementioned vehicle cooling system, comprising the following steps: When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is not greater than the first preset temperature, and the battery pack water outlet temperature is not greater than the second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is higher than the first preset temperature, and the battery pack outlet water temperature is higher than the second preset temperature, the third circuit is used to cool the passenger compartment.

[0014] In some embodiments, when the vehicle is in motion and the passenger compartment needs to be cooled, and the vehicle speed is not less than a first preset speed, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, or when the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the fifth circuit is used to cool the passenger compartment.

[0015] The beneficial effects of the technical solution provided by this invention include: This invention provides a vehicle refrigeration system and method. The vehicle refrigeration system includes an electric compressor, a condenser, a plate heat exchanger, and a passenger compartment evaporator. The electric compressor, the plate heat exchanger, and the passenger compartment evaporator form a first circuit. The plate heat exchanger is connected to a battery pack to form a second circuit. The electric compressor, the condenser, and the passenger compartment evaporator form a third circuit. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is not higher than a first preset temperature and the battery pack outlet water temperature is not higher than a second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is higher than the first preset temperature and the battery pack outlet water temperature is higher than the second preset temperature, the third circuit is used to cool the passenger compartment. By using the battery pack's coolant through the first and second circuits to cool the passenger compartment, the heat exchange efficiency of the condenser is improved when the vehicle is parked and stationary without oncoming wind, avoiding the problem of high cooling energy consumption and insufficient cooling capacity of the entire system when using the condenser alone. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a vehicle refrigeration system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first circuit and the second circuit provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the third circuit provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the fourth and fifth circuits provided in an embodiment of the present invention; Figure label: 1. Electric compressor; 2. Condenser; 3. Plate heat exchanger; 4. Passenger cabin evaporator; 5. First solenoid valve; 6. Second solenoid valve; 7. Electronic expansion valve; 8. Third solenoid valve; 9. Fourth solenoid valve; 10. Battery-powered water pump. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a vehicle refrigeration system that solves the technical problem that when a vehicle is parked and stationary, there is no oncoming wind, resulting in poor heat exchange efficiency of the condenser. If the condenser is used alone for refrigeration, the overall system will have high refrigeration energy consumption and insufficient cooling capacity.

[0020] Figure 1This invention provides a vehicle refrigeration system comprising: an electric compressor 1, a condenser 2, a plate heat exchanger 3, and a passenger compartment evaporator 4. The electric compressor 1, the plate heat exchanger 3, and the passenger compartment evaporator 4 form a first circuit. The plate heat exchanger 3 is connected to a battery pack to form a second circuit. The electric compressor 1, the condenser 2, and the passenger compartment evaporator 4 form a third circuit. When the vehicle is parked and the passenger compartment requires cooling, and the battery pack temperature is not greater than a first preset temperature and the battery pack outlet water temperature is not greater than a second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment requires cooling, and the battery pack temperature is greater than the first preset temperature and the battery pack outlet water temperature is greater than the second preset temperature, the third circuit is used to cool the passenger compartment.

[0021] The vehicle refrigeration system of this invention includes an electric compressor, a condenser, a plate heat exchanger, and a passenger compartment evaporator. The electric compressor, the plate heat exchanger, and the passenger compartment evaporator form a first circuit. The plate heat exchanger is connected to the battery pack to form a second circuit. The electric compressor, the condenser, and the passenger compartment evaporator form a third circuit. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is not higher than a first preset temperature and the battery pack outlet water temperature is not higher than a second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, and the battery pack temperature is higher than the first preset temperature and the battery pack outlet water temperature is higher than the second preset temperature... When the vehicle is stationary, the third circuit is used to cool the passenger compartment. Taking advantage of the large heat capacity of the battery pack and battery coolant, it is used as a component to store cold energy. When the vehicle's air intake efficiency is high, cold energy is stored in the battery and its coolant. When the vehicle is parked, the battery's heat load is low, and the passenger compartment is cooled by using the battery pack's coolant as a refrigerant through the first and second circuits. The cooling efficiency and cooling capacity are both high. When the vehicle is stationary and there is no oncoming wind, the condensation heat exchange effect is better than that of a stationary condenser, and the cooling capacity is large. It can achieve rapid cooling of the passenger compartment, improve the heat exchange efficiency of the condenser, and avoid the problem of high cooling energy consumption and insufficient cooling capacity of the entire system when using the condenser alone.

[0022] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2As shown, the vehicle refrigeration system further includes: a first solenoid valve 5, a second solenoid valve 6, and an electronic expansion valve 7. The first solenoid valve 5 is located between the electric compressor 1 and the plate heat exchanger 3. The second solenoid valve 6 is located between the plate heat exchanger 3 and the passenger compartment evaporator 4. The electronic expansion valve 7 is located between the plate heat exchanger 3 and the second solenoid valve 6. When the vehicle is parked and the passenger compartment needs to be refrigerated, the battery pack temperature is not greater than a first preset temperature, and the battery pack outlet water temperature is not greater than a second preset temperature, the first solenoid valve 5, the second solenoid valve 6, and the electronic expansion valve 7 are turned on, and the first circuit and the second circuit are used to refrigerate the passenger compartment.

[0023] Specifically, when the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is ≤55℃, and the battery pack outlet water temperature is ≤40℃, the first solenoid valve 5, the second solenoid valve 6, and the electronic expansion valve 7 are turned on, while the third solenoid valve 8 and the fourth solenoid valve 9 are turned off. The electric compressor 1 and the battery water pump 10 are started. The battery water pump 10 is used to drive the coolant to circulate in the second circuit. Through the first circuit and the second circuit, i.e., the plate heat exchanger 3, the battery pack and the relatively cold coolant in the battery pack are used as refrigerants to cool the passenger compartment. The cooling efficiency is high and the cooling capacity is also high.

[0024] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 3 As shown, the vehicle refrigeration system further includes a third solenoid valve 8, which is located between the electric compressor 1 and the condenser 2. When the vehicle is parked and the passenger compartment needs to be refrigerated, the battery pack temperature is greater than the first preset temperature, and the battery pack water outlet temperature is greater than the second preset temperature, the third solenoid valve 8 and the second solenoid valve 6 are turned on, and the electronic expansion valve 7 and the first solenoid valve 5 are turned off, using the third circuit to refrigerate the passenger compartment.

[0025] Specifically, when the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is >55°C, and the battery pack outlet water temperature is >40°C, in order to prevent the battery from overheating or because the heat exchange efficiency through the battery coolant has decreased due to the high battery water temperature, the cooling is switched to the third circuit, namely the condenser 2. The third solenoid valve 8 and the second solenoid valve 6 are turned on, while the electronic expansion valve 7 and the first solenoid valve 5 are turned off. At this time, the electronic fan of the condenser 2 is turned on, and the passenger compartment is cooled directly through the condenser 2.

[0026] In addition, the battery pack temperature and battery pack outlet water temperature values ​​for using the first and second circuits or the third circuit to cool the passenger compartment can be set as interval values. For example, when the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is ≤55℃ and the battery pack outlet water temperature is ≤40℃, the first and second circuits are used to cool the passenger compartment; when the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is ≥60℃ and the battery pack outlet water temperature is ≥45℃, the third circuit is used to cool the passenger compartment. This can avoid the system frequently switching between the two working modes when the temperature fluctuates near the threshold, which would lead to instability in the control system, frequent valve operation shortening the service life, and fluctuations in cooling effect affecting the user experience.

[0027] As an optional implementation, in one embodiment of the invention, the first preset temperature is 55℃~60℃ and the second preset temperature is 40℃~45℃. Setting the temperature value as a range avoids frequent system switching caused by temperature fluctuations near a single threshold, thereby improving system stability and optimizing the utilization efficiency of cold storage energy.

[0028] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4 As shown, the vehicle refrigeration system further includes a fourth circuit and a fifth circuit. The fourth circuit includes the electric compressor 1, the condenser 2, and the plate heat exchanger 3. The fifth circuit includes the electric compressor 1, the condenser 2, and the passenger compartment evaporator 4. When the vehicle is in motion and the passenger compartment needs cooling, and the vehicle speed is not less than a first preset speed, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, and the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than a third preset temperature, the fifth circuit is used to cool the passenger compartment.

[0029] Specifically, when the vehicle is in motion and the passenger compartment needs cooling, and the vehicle speed is ≥50km / h, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment; when the vehicle is in motion and the passenger compartment needs cooling, and the vehicle speed is <50km / h or the battery pack temperature is ≤35℃, the fifth circuit is used to cool the passenger compartment.

[0030] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4As shown, the vehicle refrigeration system further includes: a fourth solenoid valve 9, which is located between the electric compressor 1 and the plate heat exchanger 3. When the vehicle speed is not less than a first preset speed, the third solenoid valve 8, the electronic expansion valve 7, and the fourth solenoid valve 9 are turned on, the first solenoid valve 5 is turned off, and the fourth circuit and the second circuit are used to cool the battery pack; the second solenoid valve 6 is turned on, and the fifth circuit is used to cool the passenger compartment.

[0031] Specifically, when the vehicle is in motion and the passenger compartment requires cooling, and the vehicle speed is ≥50km / h, the third solenoid valve 8, the electronic expansion valve 7, and the fourth solenoid valve 9 are activated, the first solenoid valve 5 is deactivated, and the fourth circuit and the second circuit are used to cool the battery pack. The second solenoid valve 6 is activated, and the fifth circuit is used to cool the passenger compartment. The system cools and stores cold energy in the battery pack, taking advantage of the large heat capacity of the battery pack and battery coolant, using them as components for storing cold energy. When the vehicle's air intake efficiency is high, cold energy is stored in the battery and its coolant. The electronic fan of the condenser 2 in the fifth circuit is also turned on, and the passenger compartment is cooled directly by condensing the condenser 2.

[0032] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4 As shown, when the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the electronic expansion valve 7 is disconnected, and the second solenoid valve 6 and the third solenoid valve 8 are turned on, using the fifth circuit to cool the passenger compartment.

[0033] Specifically, when the battery does not request cooling and the vehicle speed is <50km / h or the battery pack temperature is ≤35℃, the electronic expansion valve 7 is disconnected, and the second solenoid valve 6 and the third solenoid valve 8 are turned on, using the fifth circuit to cool the passenger compartment, that is, directly cooling the passenger compartment through the condenser 2; when the passenger compartment does not need cooling, the second solenoid valve 6 can be closed, and conversely, when the passenger compartment needs cooling, the second solenoid valve 6 can be opened.

[0034] In addition, the vehicle speed can be set as an interval value. For example, when the vehicle is driving and the passenger compartment needs to be cooled, and the vehicle speed is ≥50km / h, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is driving and the passenger compartment needs to be cooled, and the vehicle speed is ≤30km / h or the battery pack temperature is ≤35℃, the fifth circuit is used to cool the passenger compartment. This can avoid the system frequently switching between the two working modes when the vehicle speed fluctuates near the threshold, which would lead to instability in the control system, frequent valve operation shortening the service life, and fluctuations in the cooling effect affecting the user experience.

[0035] As an optional implementation, in one embodiment of the invention, the first preset speed is 30km / h~50km / h, and the third preset temperature is 35℃~37℃. Setting the speed and temperature values ​​as ranges avoids frequent system switching caused by fluctuations in the speed or temperature values ​​near a single threshold, thereby improving system stability and optimizing the utilization efficiency of cold storage energy.

[0036] This invention also provides a vehicle cooling method, comprising the following steps: When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is not higher than the first preset temperature, and the battery pack water outlet temperature is not higher than the second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment; when the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is higher than the first preset temperature, and the battery pack water outlet temperature is higher than the second preset temperature, the third circuit is used to cool the passenger compartment.

[0037] The vehicle cooling method of this invention utilizes the large heat capacity of the battery pack and battery coolant, using them as components for storing cold energy. When the vehicle's air intake efficiency is high, cold energy is stored in the battery and its coolant. When the vehicle is parked, the battery's heat load is low, and the passenger compartment is cooled by using the battery pack's coolant as a refrigerant through the first and second circuits. This method has high cooling efficiency and high cooling capacity. When the vehicle is parked and stationary with no oncoming wind, it has a better condensation heat exchange effect than a stationary condenser, resulting in a larger cooling capacity and enabling rapid cooling of the passenger compartment. This improves the heat exchange efficiency of the condenser and avoids the problems of high energy consumption and insufficient cooling capacity of the entire system when using the condenser alone.

[0038] As an optional implementation, in one embodiment of the invention, when the vehicle is moving and the passenger compartment requires cooling, and the vehicle speed is not less than a first preset speed, the fourth and second circuits are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment; when the vehicle is moving and the passenger compartment requires cooling, and the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than a third preset temperature, the fifth circuit is used to cool the passenger compartment. During vehicle operation, regardless of whether the battery pack requests cooling, when the vehicle speed is ≥50km / h, the fourth and second circuits are used to cool the battery pack. The fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, or when the vehicle speed is <50km / h or the battery pack temperature is ≤35℃, the fifth circuit is used to cool the passenger compartment. When the air intake efficiency of the condenser 2 is good, the battery is lowered to a relatively low temperature. That is, the battery is stored in cold air when the air intake efficiency is high. When the vehicle is parked and there is no oncoming wind, the cold storage capacity of the battery body is used for condensation, which improves the energy utilization efficiency, improves the heat exchange efficiency of the condenser, and avoids the problem of high cooling energy consumption and insufficient cooling capacity of the entire system when the condenser is used alone for cooling.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0040] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A vehicle refrigeration system, characterized in that, include: Electric compressor (1), condenser (2), plate heat exchanger (3), passenger compartment evaporator (4); The electric compressor (1), the plate heat exchanger (3), and the passenger cabin evaporator (4) form a first loop, and the plate heat exchanger (3) is connected to the battery pack to form a second loop; The electric compressor (1), the condenser (2), and the passenger cabin evaporator (4) form a third loop; When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is not greater than the first preset temperature, and the battery pack water outlet temperature is not greater than the second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is greater than the first preset temperature, and the battery pack outlet water temperature is greater than the second preset temperature, the third circuit is used to cool the passenger compartment.

2. The vehicle refrigeration system according to claim 1, characterized in that, Also includes: The first solenoid valve (5) is located between the electric compressor (1) and the plate heat exchanger (3); The second solenoid valve (6) is located between the plate heat exchanger (3) and the passenger cabin evaporator (4); An electronic expansion valve (7) is located between the plate heat exchanger (3) and the second solenoid valve (6). When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is not greater than the first preset temperature, and the battery pack outlet water temperature is not greater than the second preset temperature, the first solenoid valve (5), the second solenoid valve (6), and the electronic expansion valve (7) are turned on, and the first circuit and the second circuit are used to cool the passenger compartment.

3. The vehicle refrigeration system according to claim 2, characterized in that, Also includes: The third solenoid valve (8) is located between the electric compressor (1) and the condenser (2); When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is greater than the first preset temperature, and the battery pack outlet water temperature is greater than the second preset temperature, the third solenoid valve (8) and the second solenoid valve (6) are turned on, and the electronic expansion valve (7) and the first solenoid valve (5) are turned off, and the third circuit is used to cool the passenger compartment.

4. The vehicle refrigeration system according to claim 3, characterized in that: The first preset temperature is 55℃~60℃, and the second preset temperature is 40℃~45℃.

5. The vehicle refrigeration system according to claim 3, characterized in that, Also includes: The fourth circuit includes the electric compressor (1), the condenser (2), and the plate heat exchanger (3). The fifth circuit includes the electric compressor (1), the condenser (2), and the passenger compartment evaporator (4). When the vehicle is in motion and the passenger compartment needs to be cooled, and the vehicle speed is not less than the first preset speed, the fourth circuit and the second circuit are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, or when the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the fifth circuit is used to cool the passenger compartment.

6. The vehicle refrigeration system according to claim 5, characterized in that, Also includes: The fourth solenoid valve (9) is located between the electric compressor (1) and the plate heat exchanger (3); When the vehicle speed is not less than the first preset speed, the third solenoid valve (8), the electronic expansion valve (7), and the fourth solenoid valve (9) are turned on, the first solenoid valve (5) is turned off, and the fourth circuit and the second circuit are used to cool the battery pack; the second solenoid valve (6) is turned on, and the fifth circuit is used to cool the passenger compartment.

7. The vehicle refrigeration system according to claim 6, characterized in that: When the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the electronic expansion valve (7) is disconnected, and the second solenoid valve (6) and the third solenoid valve (8) are turned on, using the fifth circuit to cool the passenger compartment.

8. The vehicle refrigeration system according to claim 7, characterized in that: The first preset speed is 30km / h to 50km / h, and the third preset temperature is 35℃ to 37℃.

9. A vehicle cooling method, using the vehicle cooling system of claim 1, characterized in that, Includes the following steps: When the vehicle is parked and the passenger compartment needs to be cooled, the battery pack temperature is not greater than the first preset temperature, and the battery pack water outlet temperature is not greater than the second preset temperature, the first circuit and the second circuit are used to cool the passenger compartment. When the vehicle is parked and the passenger compartment needs cooling, the battery pack temperature is higher than the first preset temperature, and the battery pack outlet water temperature is higher than the second preset temperature, the third circuit is used to cool the passenger compartment.

10. The vehicle refrigeration method according to claim 9, characterized in that, Also includes: When the vehicle is in motion and the passenger compartment needs to be cooled, and the vehicle speed is not less than the first preset speed, the fourth and second circuits are used to cool the battery pack, and the fifth circuit is used to cool the passenger compartment. When the vehicle is in motion and the passenger compartment needs cooling, or when the vehicle speed is less than the first preset speed or the battery pack temperature is not greater than the third preset temperature, the fifth circuit is used to cool the passenger compartment.

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