Refrigerant leakage diagnosis method, device, equipment and readable storage medium

Abstract

The application provides a refrigerant leakage diagnosis method, device, equipment and readable storage medium, the refrigerant leakage diagnosis method comprises the following steps: when the vehicle air conditioning system is in the refrigeration working state, and the opening degree of the electronic expansion valve is the preset opening degree, detecting whether the water pump of the battery water circuit is in the working state; if yes, when the time length that the water pump of the battery water circuit is in the working state exceeds the preset time length, determining the refrigerant leakage diagnosis result according to the inlet temperature and the outlet temperature of the battery pack; if no, calculating the superheat value of the battery cooler outlet according to the temperature and the pressure of the battery cooler outlet, and determining the refrigerant leakage diagnosis result according to the superheat value of the battery cooler outlet. Through the method, the battery water circuit water temperature method and the superheat value method are used to determine the refrigerant leakage diagnosis result under the conditions that the water pump of the battery water circuit is in the working state and the non-working state, and after determining that there is a refrigerant leakage fault, the user is timely informed to check and repair.

Description

Technical Field

[0001] This invention relates to the field of battery cooler fault diagnosis technology, and in particular to a method, apparatus, equipment and readable storage medium for diagnosing refrigerant leaks. Background Technology

[0002] In existing vehicle multi-evaporation air conditioning systems, the refrigerant flow generated by the air conditioning compressor is transmitted in the vehicle passenger compartment and the battery cooler assembly, forming the vehicle passenger compartment refrigerant circuit and the battery cooler refrigerant circuit, respectively. The battery cooler assembly includes a battery cooler chiller and an electronic expansion valve (EXV). By adjusting the opening of the electronic expansion valve, the amount of refrigerant flow transmitted from the battery cooler refrigerant circuit to the battery water circuit is adjusted, thereby cooling the water in the battery water circuit and achieving the purpose of cooling the battery pack. Due to manufacturing and assembly issues in the battery cooler or the failure of the electronic expansion valve's opening control after prolonged operation, refrigerant leakage occurs inside the battery cooler assembly. This means that refrigerant leakage occurs in the battery cooler's refrigerant circuit. Since the refrigerant circuit in the vehicle's passenger compartment and the refrigerant circuit in the battery cooler are connected in parallel, most of the refrigerant flow returns from the battery cooler's refrigerant circuit to the compressor. This results in a reduced refrigerant flow to the passenger compartment, leading to a decrease in the air conditioning cooling effect in the passenger compartment. If the refrigerant flow is increased by increasing the compressor's power to improve the air conditioning cooling effect in the passenger compartment, it will increase the overall energy consumption of the vehicle. Summary of the Invention

[0003] The main objective of this invention is to provide a refrigerant leak diagnosis method, apparatus, device, and readable storage medium, aiming to solve the technical problem that when a refrigerant leak occurs in the refrigerant circuit of the battery cooler, the air conditioning cooling effect in the vehicle's passenger compartment will deteriorate. In this case, if the refrigerant flow is increased by increasing the power of the compressor to improve the air conditioning cooling effect in the passenger compartment, it will lead to an increase in the energy consumption of the entire vehicle.

[0004] In a first aspect, the present invention provides a method for diagnosing refrigerant leaks, the method comprising:

[0005] When the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at the preset opening, check whether the water pump in the battery water circuit is working.

[0006] If so, when the pump in the battery water circuit is in operation for a period of time exceeding the preset time, the refrigerant leak diagnosis result is determined based on the inlet and outlet temperatures of the battery pack.

[0007] If not, the superheat value at the battery cooler outlet is calculated based on the temperature and pressure at the battery cooler outlet, and the refrigerant leak diagnosis result is determined based on the superheat value at the battery cooler outlet.

[0008] Optionally, determining the refrigerant leak diagnosis result based on the inlet and outlet temperatures of the battery pack includes:

[0009] Obtain the inlet and outlet temperatures of the battery pack;

[0010] When the inlet temperature of the battery pack is lower than the outlet temperature, and the outlet temperature of the battery pack is lower than the real-time temperature of the battery pack, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0011] Optionally, the step of calculating the superheat value at the battery cooler outlet based on the temperature and pressure at the battery cooler outlet, and determining the refrigerant leak diagnosis result based on the superheat value at the battery cooler outlet, includes:

[0012] Obtain the temperature and pressure at the battery cooler outlet;

[0013] Based on the pressure at the battery cooler outlet, look up the table of correspondence between the battery cooler outlet pressure and the saturation temperature to obtain the saturation temperature;

[0014] Calculate the difference between the outlet temperature and the saturation temperature of the battery cooler to obtain the superheat value at the battery cooler outlet;

[0015] When the superheat value at the battery cooler outlet is less than or equal to the preset value, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0016] Optionally, after determining the refrigerant leak diagnosis result, the following steps are included:

[0017] If the refrigerant leak diagnosis indicates a refrigerant leak fault, then shut down the refrigerant circuit of the battery cooler.

[0018] Optionally, the refrigerant circuit for shutting down the battery cooler includes:

[0019] Close the electric valve on the refrigerant circuit of the battery cooler to shut off the refrigerant circuit of the battery cooler.

[0020] Secondly, the present invention also provides a refrigerant leak diagnostic device, the refrigerant leak diagnostic device comprising:

[0021] The detection module is used to detect whether the water pump in the battery water circuit is working when the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening.

[0022] The first determining module is used to determine the refrigerant leakage diagnosis result based on the inlet and outlet temperatures of the battery pack if the pump in the battery water circuit has been in operation for a period of time exceeding a preset time.

[0023] The second determining module is used to calculate the superheat value at the battery cooler outlet based on the temperature and pressure at the battery cooler outlet if no, and to determine the refrigerant leakage diagnosis result based on the superheat value at the battery cooler outlet.

[0024] Optionally, the first determining module is used to:

[0025] Obtain the inlet and outlet temperatures of the battery pack;

[0026] When the inlet temperature of the battery pack is lower than the outlet temperature, and the outlet temperature of the battery pack is lower than the real-time temperature of the battery pack, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0027] Optionally, the second determining module is used for:

[0028] Obtain the temperature and pressure at the battery cooler outlet;

[0029] Based on the pressure at the battery cooler outlet, look up the table of correspondence between the battery cooler outlet pressure and the saturation temperature to obtain the saturation temperature;

[0030] Calculate the difference between the outlet temperature and the saturation temperature of the battery cooler to obtain the superheat value at the battery cooler outlet;

[0031] When the superheat value at the battery cooler outlet is less than or equal to the preset value, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0032] Thirdly, the present invention also provides a refrigerant leak diagnostic device, the refrigerant leak diagnostic device including a processor, a memory, and a refrigerant leak diagnostic program stored in the memory and executable by the processor, wherein when the refrigerant leak diagnostic program is executed by the processor, the steps of the refrigerant leak diagnostic method as described above are implemented.

[0033] Fourthly, the present invention also provides a readable storage medium storing a refrigerant leak diagnostic program, wherein when the refrigerant leak diagnostic program is executed by a processor, it implements the steps of the refrigerant leak diagnostic method as described above.

[0034] In this invention, when the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening, the system checks whether the battery water circuit pump is operating. If it is, and the pump operates for a duration exceeding a preset time, a refrigerant leak diagnosis is determined based on the battery pack's inlet and outlet temperatures. If not, the superheat value at the battery cooler outlet is calculated based on the outlet temperature and pressure, and the refrigerant leak diagnosis is determined based on this superheat value. This invention determines refrigerant leak diagnoses using both the battery water circuit temperature method and the superheat value method, under two conditions: when the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening, and the battery water circuit pump is operating or not. Once a refrigerant leak is confirmed in the battery cooler, the user is promptly notified for inspection and repair. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the hardware structure of an embodiment of the refrigerant leak diagnosis device of the present invention;

[0036] Figure 2 This is a flowchart illustrating an embodiment of the refrigerant leak diagnosis method of the present invention;

[0037] Figure 3 for Figure 2 A detailed flowchart of step S20;

[0038] Figure 4 for Figure 2 A detailed flowchart of step S30;

[0039] Figure 5 This is a schematic diagram of the refrigerant circuit and battery water circuit of a battery cooler according to an embodiment of the refrigerant leakage diagnosis method of the present invention;

[0040] Figure 6 This is a schematic diagram of the functional modules of an embodiment of the refrigerant leak diagnosis device of the present invention.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0043] In a first aspect, embodiments of the present invention provide a refrigerant leak diagnostic device.

[0044] Reference Figure 1 , Figure 1This is a schematic diagram of the hardware structure of an embodiment of the refrigerant leak diagnostic device of the present invention. In this embodiment, the refrigerant leak diagnostic device may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize communication between these components; the user interface 1003 may include a display screen or an input unit such as a keyboard; the network interface 1004 may optionally include a standard wired interface or a wireless interface (e.g., Wireless Fidelity, Wi-Fi); the memory 1005 may be high-speed random access memory (RAM) or stable memory (non-volatile memory), such as a disk storage device. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that… Figure 1 The hardware structure shown does not constitute a limitation of the invention and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0045] Continue to refer to Figure 1 , Figure 1 The memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a refrigerant leak diagnosis program. The processor 1001 can call the refrigerant leak diagnosis program stored in the memory 1005 and execute the refrigerant leak diagnosis method provided in this embodiment of the invention.

[0046] Secondly, embodiments of the present invention provide a method for diagnosing refrigerant leaks.

[0047] To more clearly demonstrate the refrigerant leak diagnosis method provided in the embodiments of this application, we will first introduce the application scenarios of the refrigerant leak diagnosis method provided in the embodiments of this application.

[0048] The refrigerant leakage diagnosis method provided in this application is applied to situations where refrigerant leakage occurs in the refrigerant circuit of the battery cooler due to process problems during battery cooler manufacturing and assembly or failure of electronic expansion valve opening control after prolonged operation. When refrigerant leakage occurs in the refrigerant circuit of the battery cooler, since the refrigerant circuit of the vehicle passenger compartment and the refrigerant circuit of the battery cooler are connected in parallel, the refrigerant flow to the vehicle passenger compartment will decrease, resulting in a poorer air conditioning cooling effect in the vehicle passenger compartment. If the refrigerant flow is increased by increasing the compressor power to improve the air conditioning cooling effect of the vehicle passenger compartment, it will lead to an increase in the energy consumption of the entire vehicle. Therefore, it is necessary to diagnose the refrigerant leakage fault in the refrigerant circuit of the battery cooler in a timely and accurate manner, and notify the user in a timely manner for inspection and repair.

[0049] In one embodiment, reference is made to Figure 2 , Figure 2 This is a schematic flowchart of an embodiment of the refrigerant leak diagnosis method of the present invention, as shown below. Figure 2 As shown, the refrigerant leak diagnosis method includes:

[0050] Step S10: When the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening, check whether the water pump in the battery water circuit is in operation.

[0051] In this embodiment, when the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening degree, such as zero degrees, meaning the electronic expansion valve is closed, there should be no refrigerant flow exchange between the refrigerant circuit and the battery water circuit of the battery cooler. The pump in the battery water circuit is checked to see if it is in operation, so as to further diagnose whether there is a refrigerant leakage fault.

[0052] Step S20, if yes, then when the water pump in the battery water circuit is in working condition for a period of time exceeding the preset time, the refrigerant leakage diagnosis result is determined based on the inlet temperature and outlet temperature of the battery pack.

[0053] In this embodiment, if the water pump in the battery water circuit is in operation, and the duration of operation exceeds a preset time, such as 5 minutes, the battery water circuit temperature method is used to diagnose whether there is a refrigerant leak in the refrigerant circuit of the battery cooler. That is, the diagnosis result of refrigerant leak is determined by the inlet and outlet temperatures of the battery pack.

[0054] Step S30: If not, calculate the superheat value at the battery cooler outlet based on the temperature and pressure at the battery cooler outlet, and determine the refrigerant leak diagnosis result based on the superheat value at the battery cooler outlet.

[0055] In this embodiment, if the water pump in the battery water circuit is not in operation, the battery pack does not require cooling. In this case, the superheat value method is used to diagnose whether there is a refrigerant leak in the refrigerant circuit of the battery cooler. That is, firstly, the superheat value of the battery cooler outlet is calculated based on the temperature and pressure of the battery cooler outlet, and then the diagnosis result of refrigerant leak is determined based on the superheat value of the battery cooler outlet.

[0056] In this embodiment, when the vehicle's air conditioning system is in cooling mode and the electronic expansion valve is at a preset opening degree, such as zero degrees, meaning the electronic expansion valve is closed, there should be no refrigerant flow exchange between the refrigerant circuit and the battery water circuit. In this case, the refrigerant leakage diagnosis results are determined using the battery water circuit temperature method and the superheat value method, respectively, under the two conditions of the battery water circuit pump being in working and non-working states. After determining that there is a refrigerant leakage fault in the battery cooler, the fault code is reported to the vehicle terminal via the vehicle CAN network to promptly notify the user for inspection and repair.

[0057] Furthermore, in one embodiment, reference is made to Figure 3 , Figure 3 for Figure 2 A detailed flowchart of step S20 is shown below. Figure 3 As shown, step S20 includes:

[0058] Step S201: Obtain the inlet temperature and outlet temperature of the battery pack;

[0059] In step S202, when the inlet temperature of the battery pack is lower than the outlet temperature, and the outlet temperature of the battery pack is lower than the real-time temperature of the battery pack, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be no refrigerant leak fault.

[0060] In this embodiment, when the electronic expansion valve is open to zero, meaning there is no refrigerant flow exchange between the refrigerant circuit and the battery water circuit of the battery cooler, if the water pump in the battery water circuit is in operation and the duration of operation exceeds a preset time (e.g., 5 minutes), the water temperature in the battery water circuit will continuously rise as the pump circulates. If there is a refrigerant leak in the battery cooler at this time, the leaked refrigerant will flow into the battery water circuit, causing the water temperature in the battery water circuit to be lower than the real-time temperature of the battery. Therefore, when the inlet temperature of the battery pack is lower than the outlet temperature, and the outlet temperature of the battery pack is lower than the real-time temperature of the battery pack, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0061] Furthermore, in one embodiment, reference is made to Figure 4 , Figure 4 for Figure 2A detailed flowchart of step S30 is shown below. Figure 4 As shown, step S30 includes:

[0062] Step S301: Obtain the temperature and pressure at the battery cooler outlet;

[0063] Step S302: Based on the pressure at the battery cooler outlet, look up the correspondence table between the battery cooler outlet pressure and the saturation temperature to obtain the saturation temperature;

[0064] Step S303: Calculate the difference between the outlet temperature and the saturation temperature of the battery cooler to obtain the superheat value at the outlet of the battery cooler.

[0065] Step S304: When the superheat value at the battery cooler outlet is less than or equal to the preset value, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0066] In this embodiment, when the water pump in the battery water circuit is not in operation, the refrigerant flow of the air conditioning system does not undergo heat exchange when passing through the refrigerant circuit of the battery cooler. The superheat value at the battery cooler outlet is used to diagnose whether there is a refrigerant leak in the refrigerant circuit of the battery cooler. First, the pressure at the battery cooler outlet is obtained. Then, based on the pressure at the battery cooler outlet, the corresponding relationship table between the pressure and saturation temperature of the refrigerant used in the air conditioning system is consulted to obtain the saturation temperature. The difference between the battery cooler outlet temperature and the saturation temperature is the superheat value at the battery cooler outlet. When the superheat value at the battery cooler outlet is less than or equal to a preset value, such as 0, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0067] Further, in one embodiment, after step S20 or step S30, the following is included:

[0068] If the refrigerant leak diagnosis indicates a refrigerant leak fault, then shut down the refrigerant circuit of the battery cooler.

[0069] In this embodiment, if the refrigerant leak diagnosis result indicates a refrigerant leak fault, the refrigerant circuit of the battery cooler is shut off, allowing all the refrigerant flow of the air conditioning system to flow to the vehicle passenger compartment. This improves the air conditioning comfort of the passenger compartment, reduces overall vehicle energy consumption, and avoids wasting refrigerant flow due to a refrigerant leak fault in the battery cooler. If the refrigerant flow is increased by increasing the compressor power to improve the air conditioning comfort of the passenger compartment, it will lead to an increase in overall vehicle energy consumption.

[0070] Furthermore, in one embodiment, the refrigerant circuit for shutting off the battery cooler includes:

[0071] Close the electric valve on the refrigerant circuit of the battery cooler to shut off the refrigerant circuit of the battery cooler.

[0072] In this embodiment, the refrigerant circuit of the battery cooler is shut off by closing the electric valve located on the refrigerant circuit of the battery cooler. (Refer to...) Figure 5 , Figure 5 This is a schematic diagram of the refrigerant circuit and battery water circuit of a battery cooler according to an embodiment of the refrigerant leak diagnosis method of the present invention, as shown below. Figure 5 As shown, the electric valve ELV is located on the refrigerant circuit of the battery cooler. When the battery pack does not require cooling, the electric valve ELV can be closed to shut off the refrigerant circuit of the battery cooler, avoiding energy waste caused by refrigerant leakage in the refrigerant circuit of the battery cooler. The refrigerant flow of the air conditioning system will then flow entirely to the passenger compartment, thereby improving the air conditioning comfort of the passenger compartment and reducing the overall vehicle energy consumption. When the battery requires cooling, the electric valve ELV can be opened to cool the battery pack and prevent the battery pack from overheating.

[0073] Thirdly, embodiments of the present invention also provide a refrigerant leakage diagnostic device.

[0074] Reference Figure 6 , Figure 6 This is a schematic diagram of the functional modules of an embodiment of the refrigerant leak diagnosis device of the present invention.

[0075] In this embodiment, the refrigerant leak diagnostic device includes:

[0076] The detection module 10 is used to detect whether the water pump in the battery water circuit is working when the vehicle air conditioning system is in cooling mode and the opening of the electronic expansion valve is at a preset opening.

[0077] The first determining module 20 is used to determine the refrigerant leakage diagnosis result based on the inlet and outlet temperatures of the battery pack if the duration of operation of the water pump in the battery water circuit exceeds a preset duration.

[0078] The second determining module 30 is used to calculate the superheat value of the battery cooler outlet based on the temperature and pressure at the battery cooler outlet if no, and to determine the refrigerant leakage diagnosis result based on the superheat value of the battery cooler outlet.

[0079] Furthermore, in one embodiment, the first determining module 20 is configured to:

[0080] Obtain the inlet and outlet temperatures of the battery pack;

[0081] When the inlet temperature of the battery pack is lower than the outlet temperature, and the outlet temperature of the battery pack is lower than the real-time temperature of the battery pack, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0082] Furthermore, in one embodiment, the second determining module 30 is used for:

[0083] Obtain the temperature and pressure at the battery cooler outlet;

[0084] Based on the pressure at the battery cooler outlet, look up the table of correspondence between the battery cooler outlet pressure and the saturation temperature to obtain the saturation temperature;

[0085] Calculate the difference between the outlet temperature and the saturation temperature of the battery cooler to obtain the superheat value at the battery cooler outlet;

[0086] When the superheat value at the battery cooler outlet is less than or equal to the preset value, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault; otherwise, the refrigerant leak diagnosis result is determined to be a refrigerant leak fault.

[0087] Furthermore, in one embodiment, the refrigerant leak diagnostic device further includes a shut-off module for:

[0088] If the refrigerant leak diagnosis indicates a refrigerant leak fault, then shut down the refrigerant circuit of the battery cooler.

[0089] Furthermore, in one embodiment, the shut-down module is used to:

[0090] Close the electric valve on the refrigerant circuit of the battery cooler to shut off the refrigerant circuit of the battery cooler.

[0091] The functions of each module in the above-mentioned refrigerant leak diagnosis device correspond to the steps in the above-mentioned refrigerant leak diagnosis method embodiment, and their functions and implementation processes will not be described in detail here.

[0092] Fourthly, embodiments of the present invention also provide a readable storage medium.

[0093] The present invention provides a refrigerant leak diagnostic program stored on a readable storage medium, wherein when the refrigerant leak diagnostic program is executed by a processor, it implements the steps of the refrigerant leak diagnostic method described above.

[0094] The method implemented when the refrigerant leak diagnosis procedure is executed can be referred to in various embodiments of the refrigerant leak diagnosis method of the present invention, and will not be repeated here.

[0095] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system 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 system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0096] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of the present invention.

[0098] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A refrigerant leakage diagnosing method characterized by comprising: The refrigerant leakage diagnosis method comprises: When the vehicle air conditioning system is in a refrigeration working state and the opening degree of the electronic expansion valve is a preset opening degree, it is detected whether the water pump of the battery water circuit is in a working state, the preset opening degree being zero degrees, wherein when the opening degree of the electronic expansion valve is zero degrees, the refrigerant circuit of the battery cooler and the battery water circuit do not exchange refrigerant flow; If yes, when the water pump of the battery water circuit is in a working state for a time period longer than a preset time period, a refrigerant leakage diagnosis result is determined according to the inlet temperature and the outlet temperature of the battery pack; If no, a superheat value of the outlet of the battery cooler is calculated according to the temperature and the pressure of the outlet of the battery cooler, and the refrigerant leakage diagnosis result is determined according to the superheat value of the outlet of the battery cooler; The determination of the refrigerant leakage diagnosis result according to the inlet temperature and the outlet temperature of the battery pack comprises: The inlet temperature and the outlet temperature of the battery pack are acquired; When the inlet temperature of the battery pack is less than the outlet temperature, and the outlet temperature of the battery pack is less than the real-time temperature of the battery pack, it is determined that the refrigerant leakage diagnosis result is a refrigerant leakage fault, otherwise, it is determined that the refrigerant leakage diagnosis result is no refrigerant leakage fault.

2. The refrigerant leakage diagnosing method according to claim 1, characterized by The determination of the refrigerant leakage diagnosis result according to the temperature and the pressure of the outlet of the battery cooler, and the calculation of the superheat value of the outlet of the battery cooler comprise: The temperature and the pressure of the outlet of the battery cooler are acquired; The corresponding relationship table of the pressure and the saturation temperature of the outlet of the battery cooler is inquired according to the pressure of the outlet of the battery cooler to obtain the saturation temperature; The difference between the outlet temperature of the battery cooler and the saturation temperature is calculated to obtain the superheat value of the outlet of the battery cooler; When the superheat value of the outlet of the battery cooler is less than or equal to a preset value, it is determined that the refrigerant leakage diagnosis result is a refrigerant leakage fault, otherwise, it is determined that the refrigerant leakage diagnosis result is no refrigerant leakage fault.

3. The refrigerant leakage diagnosing method according to claim 1 or 2, characterized in that, After the refrigerant leakage diagnosis result is determined, the method comprises: If the refrigerant leakage diagnosis result is a refrigerant leakage fault, the refrigerant circuit of the battery cooler is closed.

4. The refrigerant leakage diagnosing method according to claim 3, wherein The closing of the refrigerant circuit of the battery cooler comprises: An electric valve arranged on the refrigerant circuit of the battery cooler is closed to close the refrigerant circuit of the battery cooler.

5. A refrigerant leakage diagnosing apparatus characterized by comprising: The refrigerant leakage diagnosis device comprises: The detection module is configured to detect whether the water pump of the battery water circuit is in a working state when the vehicle air conditioning system is in a refrigeration working state and the opening degree of the electronic expansion valve is a preset opening degree, the preset opening degree being zero degrees, wherein when the opening degree of the electronic expansion valve is zero degrees, the refrigerant circuit of the battery cooler and the battery water circuit do not exchange refrigerant flow; The first determination module is configured to, if yes, determine a refrigerant leakage diagnosis result according to the inlet temperature and the outlet temperature of the battery pack when the water pump of the battery water circuit is in a working state for a time period longer than a preset time period; The second determination module is configured to, if no, calculate a superheat value of the outlet of the battery cooler according to the temperature and the pressure of the outlet of the battery cooler, and determine the refrigerant leakage diagnosis result according to the superheat value of the outlet of the battery cooler; The first determination module is configured to: acquire the inlet temperature and the outlet temperature of the battery pack; When the inlet temperature of the battery pack is less than the outlet temperature, and the outlet temperature of the battery pack is less than the real-time temperature of the battery pack, it is determined that the refrigerant leakage diagnosis result is a refrigerant leakage fault, otherwise, it is determined that the refrigerant leakage diagnosis result is no refrigerant leakage fault.

6. The refrigerant leakage diagnosing apparatus according to claim 5, wherein The second determining module is configured to: acquire the temperature and pressure of the battery cooler outlet; query a corresponding relationship table of the pressure and saturation temperature of the battery cooler outlet according to the pressure of the battery cooler outlet to obtain the saturation temperature; calculate a difference between the outlet temperature and the saturation temperature of the battery cooler to obtain the superheat value of the battery cooler outlet; when the superheat value of the battery cooler outlet is less than or equal to a preset value, it is determined that the refrigerant leakage diagnosis result is a refrigerant leakage fault, otherwise, it is determined that the refrigerant leakage diagnosis result is no refrigerant leakage fault.

7. A refrigerant leakage diagnosing apparatus characterized by comprising: The refrigerant leakage diagnosis device includes a processor, a memory, and a refrigerant leakage diagnosis program stored on the memory and executable by the processor, wherein when the refrigerant leakage diagnosis program is executed by the processor, the steps of the refrigerant leakage diagnosis method according to any one of claims 1 to 4 are implemented.

8. A readable storage medium, characterized by, The readable storage medium has a refrigerant leakage diagnosis program stored thereon, wherein when the refrigerant leakage diagnosis program is executed by the processor, the steps of the refrigerant leakage diagnosis method according to any one of claims 1 to 4 are implemented.

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