Purging method of fuel cell stack shell, electronic equipment and storage medium

Abstract

The invention discloses a fuel cell stack shell purging method, electronic equipment and a storage medium, a fuel cell stack comprises a stack core and a shell, the stack core is arranged in the shell, the stack core comprises a hydrogen cavity, and the fuel cell stack is connected with a purging device of the fuel cell stack shell. The method comprises the following steps: determining the volume of a cavity between the reactor core and the shell and the hydrogen leakage rate of the hydrogen cavity; determining purging interval time according to the volume of the cavity and the hydrogen leakage rate; and the shell is purged according to the purging interval time. According to the scheme, the shell is intermittently purged while the safety of hydrogen in the fuel cell stack shell is guaranteed, so that the energy consumption of a fuel cell system is reduced, and the energy efficiency of the fuel cell system is improved.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell technology, and in particular relates to a purging method for a fuel cell stack casing, an electronic device, and a storage medium. Background Art

[0002] A fuel cell stack is a power generation device that uses hydrogen as fuel and directly converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, clean and pollution-free, and a wide range of fuel sources. In actual applications, the stack cannot be completely sealed due to factors such as the processing level of the stack components, the attenuation of assembly force, and the gas barrier properties of the sealing material itself. A small amount of hydrogen leaked from the core accumulates in the cavity between the core and the packaging shell. When the hydrogen concentration reaches 4%, it may cause combustion or explosion, seriously threatening personal safety. Therefore, the hydrogen safety of the fuel cell stack is particularly important, and air needs to be introduced to purge the cavity between the core and the shell to discharge the hydrogen leaked from the core in time.

[0003] In the related art, when the stack shell is purged, a branch of clean air provided by the air supply system in the fuel cell system is usually led out and introduced into the air purge port, and air is continuously introduced into the shell to purge it inside the shell, so as to keep the air circulation inside the shell, so as to discharge the hydrogen leaked from the core in time. Since the rate of hydrogen leakage from the core is very small, it takes a certain amount of time to accumulate to exceed the hydrogen concentration limit of 25% LFL (lower flammability limit), and the continuous air purge method requires continuous energy consumption, which increases the energy consumption of the fuel cell system and affects the energy efficiency of the fuel cell system. Summary of the invention

[0004] The embodiments of the present application provide a purging method, electronic device and storage medium for a fuel cell stack shell, thereby improving the efficiency of the fuel cell system while ensuring the safety of hydrogen inside the fuel cell stack shell, at least to a certain extent.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a purging method for a fuel cell stack housing is provided, and a purging device for a fuel cell stack housing is applied. The fuel cell stack includes a core and a housing, the core is arranged in the housing, the core includes a hydrogen cavity, and the fuel cell stack is connected to the purging device of the fuel cell stack housing. The purging method for the fuel cell stack housing includes:

[0007] Determine the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity;

[0008] Determine the purge interval time based on the volume of the chamber and the hydrogen leakage rate;

[0009] Purge the shell according to the purge interval.

[0010] In some embodiments, the purge device includes a purge gas source, an air inlet valve, a gas pressure gauge, a first gas flow meter and an air outlet valve, the shell includes a purge inlet and a purge outlet, the air inlet valve, the gas pressure gauge and the first gas flow meter are arranged on a pipeline between the purge gas source and the purge inlet, the air outlet valve is arranged on a pipeline at the purge outlet, and the volume of the cavity between the core and the shell is determined, including:

[0011] Control the opening of the air inlet valve and the closing of the air outlet valve;

[0012] After the test gas is introduced into the purge inlet and the pressure of the test gas reaches a preset test pressure, a first gas flow meter is used to determine a curve of a first flow rate of the test gas changing with time;

[0013] According to the change curve, the volume of the cavity between the core and the shell is determined.

[0014] In some embodiments, determining the volume of the cavity between the core and the shell according to the variation curve includes:

[0015] Determine the time for the test gas to fill the cavity and the corresponding first flow rate from the variation curve;

[0016] The volume of the cavity between the core and the shell is determined according to the time for the test gas to fill the cavity and the corresponding first flow rate.

[0017] In some embodiments, the purge device includes a second gas flow meter, the core further includes an air cavity and a coolant cavity, the air cavity, the coolant cavity and the hydrogen cavity are separately arranged, the second gas flow meter is arranged at the inlet of the hydrogen cavity, and the hydrogen leakage rate of the hydrogen cavity is determined, including:

[0018] Controlling the opening of the inlet of the hydrogen cavity, the inlet of the air cavity and the inlet of the cooling liquid cavity, and controlling the closing of the outlet of the hydrogen cavity, the outlet of the air cavity and the outlet of the cooling liquid cavity;

[0019] After the test gas is introduced into the inlet of the hydrogen chamber, the inlet of the air chamber and the inlet of the coolant chamber and the pressure of the test gas reaches the preset stack operating pressure, the average leakage rate of the test gas within a preset time period is determined by a second gas flow meter;

[0020] Based on the average leakage rate, the hydrogen leakage rate of the hydrogen chamber is determined.

[0021] In some embodiments, determining the hydrogen leakage rate of the hydrogen cavity according to the average leakage rate includes:

[0022] The average leakage rate is corrected according to the correction coefficient corresponding to the test gas to obtain the hydrogen leakage rate of the hydrogen cavity.

[0023] In some embodiments, the purge interval is determined according to the volume of the chamber and the hydrogen leakage rate, including:

[0024] Determine the leakage threshold of hydrogen from the core to the shell according to the volume of the cavity;

[0025] Divide the leak threshold by the hydrogen leak rate to obtain the purge interval time.

[0026] In some embodiments, after determining the purge interval time step according to the volume of the cavity and the hydrogen leakage rate, the method for purging the fuel cell stack housing further includes:

[0027] Determine the corresponding purge interval time of the fuel cell stack at different powers;

[0028] The power of the fuel cell stack and the determined purge interval are stored in correspondence.

[0029] According to a second aspect of an embodiment of the present application, an electronic device is provided, including a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of any method of the first aspect described above are implemented.

[0030] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of any method of the first aspect described above.

[0031] According to a fourth aspect of an embodiment of the present application, a computer program product is provided, including a computer program. When the computer program product is executed by a processor, it prompts the processor to implement the steps of any method of the first aspect described above.

[0032] In the present application, the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity are determined; the purge interval is determined according to the volume of the cavity and the hydrogen leakage rate; and the shell is purged according to the purge interval. The above scheme ensures the safety of hydrogen inside the shell of the fuel cell stack while intermittently purging the shell, thereby reducing the energy consumption of the fuel cell system and improving the energy efficiency of the fuel cell system.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 A schematic diagram of a process of purging a fuel cell stack casing in one embodiment is shown;

[0036] Figure 2 A schematic diagram of the structure of a purge device for a fuel cell stack housing in one embodiment is shown;

[0037] Figure 3 A schematic diagram of a curve showing a change in a first flow rate of a test gas over time in one embodiment is shown;

[0038] Figure 4 A schematic diagram of the structure of a purge device for a fuel cell stack casing in another embodiment is shown;

[0039] Figure 5 A schematic structural diagram of an electronic device in an embodiment is shown.

[0040] Explanation of the reference numerals: 100 - purging device of the fuel cell stack shell, 110 - gas source, 120 - pressure regulating valve, 130 - air inlet valve, 140 - gas pressure gauge, 150 - first gas flow meter, 160 - air outlet valve, 200 - shell, 210 - purge inlet, 220 - purge outlet, 230 - cavity, 240 - second gas flow meter, 250 - third gas flow meter, 260 - fourth gas flow meter, 300 - core, 310 - inlet of hydrogen chamber, 320 - outlet of hydrogen chamber, 330 - inlet of cooling liquid chamber, 340 - outlet of cooling liquid chamber, 350 - inlet of air chamber, 360 - outlet of air chamber, 500 - electronic device, 501 - receiver, 502 - processor, 503 - transmitter, 504 - memory, 505 - bus interface. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0043] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0044] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0045] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0046] Figure 1 FIG. 1 is a schematic diagram showing a process flow of a method for purging a fuel cell stack housing in one embodiment. Figure 1 As shown, a method for purging a fuel cell stack casing is provided, which can be applied to a purging device for a fuel cell stack casing. The method can include the following steps 101 to 103.

[0047] In step 101 , the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity are determined.

[0048] Figure 2 The structure diagram of the purge device of the fuel cell stack housing in one embodiment is shown. Figure 1 and Figure 2The fuel cell stack includes a core 300 and a shell 200. The core 300 is arranged in the shell 200. The core 300 includes a hydrogen chamber (not shown). The fuel cell stack is connected to the purge device 100 of the fuel cell stack shell. The purge device 100 may include a purge gas source 110, a pressure regulating valve 120, an air inlet valve 130, a gas pressure gauge 140, a first gas flow meter 150 and an outlet valve 160. The shell 200 includes a purge inlet 210 and a purge outlet 220. The pressure regulating valve 120, the air inlet valve 130, the gas pressure gauge 140 and the first gas flow meter 150 are arranged on the pipeline between the purge gas source 110 and the purge inlet 210, and the outlet valve 160 is arranged on the pipeline at the purge outlet 220.

[0049] Since a small amount of hydrogen leaked from the hydrogen cavity of the core 300 will accumulate in the cavity 230 between the core 300 and the shell 200, the purging of the shell 200 referred to in the embodiment of the present application can be understood as passing a purge gas from the purge inlet 210 to purge the cavity 230 between the shell 200 and the core 300, so as to discharge the hydrogen leaked from the hydrogen cavity in time.

[0050] According to hydrogen safety standards, the amount of hydrogen leakage from the core must not cause the hydrogen concentration in the shell to exceed 25% LFL. The lower flammable limit of hydrogen is 4%, so the amount of hydrogen leakage from the core to the cavity is Q H ≤25%×4% V0=1% V0, where V0 is the volume of the cavity between the core and the shell. Therefore, the shell purge should meet the hydrogen leakage Q H ≤1% V0.

[0051] The volume V0 of the cavity between the core and the shell can be obtained by theoretical calculation, actual measurement and other methods. Considering that the outer contour boundary of the core is relatively complex, including tie rods, end plates, copper bars, voltage patrollers, wiring harnesses and other components, and the shell is provided with many insulation and fixing brackets, etc., it is inconvenient to obtain the volume V0. In some embodiments, the volume V0 can be obtained by actual measurement, which includes the following steps: controlling the opening of the inlet valve and controlling the closing of the outlet valve; after the test gas is introduced into the purge inlet and the pressure of the test gas reaches the preset test pressure, the first gas flow meter is used to determine the change curve of the first flow of the test gas over time; according to the change curve, the volume of the cavity between the core and the shell is determined.

[0052] It is understandable that the core may also include an air cavity and a coolant cavity. The air in the air cavity reacts with the hydrogen in the hydrogen cavity to produce water. The coolant in the coolant cavity is used to adjust the core temperature. The inlet and outlet of the hydrogen, air, and coolant flow channels of the fuel cell stack can be sealed by installing a packaging cover or closing the inlet and outlet valves at the three cavity ports, and the outlet valve of the purge outlet is closed, and the inlet valve of the purge inlet is opened. Figure 1 After the above treatment, the test gas can be passed from the purge gas source through the pressure regulating valve, the air inlet valve, the gas pressure gauge, the first gas flow meter, and the purge inlet into the shell. The pressure of the test gas can be detected by the gas pressure gauge, and the flow rate of the test gas at the purge inlet can be detected by the first gas flow meter. Gradually pressurize to a preset test pressure (for example, 1.3 to 2 times the atmospheric pressure), record the flow reading of the first gas flow meter corresponding to different times (i.e., the first flow rate), and fit the recorded time with the corresponding first flow rate to obtain a curve of the first flow rate of the test gas changing with time.

[0053] Figure 3 FIG. 2 shows a schematic diagram of a curve showing a change in the first flow rate of the test gas over time in an embodiment. Figure 3 As shown, as time goes by, the first flow rate shows a downward trend and stabilizes after a period of time t0. The fluctuation range of the first flow rate after stabilization is within ±3%.

[0054] In some embodiments, the time it takes for the test gas to fill the cavity and the corresponding first flow rate can be determined from the variation curve; based on the time it takes for the test gas to fill the cavity and the corresponding first flow rate, the volume of the cavity between the core and the shell can be determined.

[0055] Continue to refer to Figure 3 , when time t = 0 ~ t0, the test gas passes through the first flow meter, enters the cavity between the core and the shell through the purge inlet, and gradually fills the cavity; when time t = t0, the cavity is filled, and the cumulative volume of the test gas introduced is the volume of the cavity, which can be calculated by integrating the flow rate over time, that is, V0 = ∫0 t0 vt, where ν is the first flow rate and t0 is the time for the test gas to fill the cavity. When time t>t0, the cavity has been filled, and the first flow rate is the micro-leakage of the shell to the outside.

[0056] The volume of the cavity between the core and the shell can be accurately obtained through the above-mentioned actual measurement method, thereby improving the accuracy of shell purge control.

[0057] Figure 4 FIG. 2 shows a schematic diagram of the structure of a purge device for a fuel cell stack housing in another embodiment. Figure 4As shown, the purge device may include a second gas flow meter 240, a third gas flow meter 250, a fourth gas flow meter 260, an air intake valve 130 and a gas pressure gauge 140, and the core 300 also includes an air cavity and a coolant cavity, and the air cavity, the coolant cavity and the hydrogen cavity are separated and arranged, the second gas flow meter 240 is arranged at the inlet 310 of the hydrogen cavity, the third gas flow meter 250 is arranged at the inlet 330 of the coolant cavity, and the fourth gas flow meter 260 is arranged at the inlet 350 of the air cavity. The purge device can be used to determine the hydrogen leakage rate of the hydrogen cavity.

[0058] Among them, the layout design of the intake valve and gas pressure gauge can refer to Figure 2 It should be noted that Figure 4 The purge device shown can be used with Figure 2 The purge devices shown are combined into one purge device, i.e. Figure 2 On the basis of the purging device shown, a second gas flow meter is added at the inlet of the hydrogen cavity of the core, a fourth gas flow meter is added at the inlet of the air cavity, and a third gas flow meter is added at the inlet of the coolant cavity. The purging device obtained by such combination can not only measure the volume of the cavity, but also be used to determine the hydrogen leakage rate of the hydrogen cavity.

[0059] In some embodiments, the inlet 310 of the hydrogen chamber, the inlet 350 of the air chamber, and the inlet 330 of the coolant chamber can be controlled to be open, and the outlet 320 of the hydrogen chamber, the outlet 360 of the air chamber, and the outlet 340 of the coolant chamber can be controlled to be closed; after the test gas is introduced into the inlet 310 of the hydrogen chamber, the inlet 350 of the air chamber, and the inlet 330 of the coolant chamber and the pressure of the test gas reaches the preset stack operating pressure, the average leakage rate of the test gas within a preset time period is determined by a second gas flowmeter; based on the average leakage rate, the hydrogen leakage rate of the hydrogen chamber is determined.

[0060] It is understandable that the test gas used when determining the hydrogen leakage rate of the hydrogen chamber may be the same as or different from the test gas used when measuring the volume of the chamber. To ensure safety, the test gas used when determining the hydrogen leakage rate of the hydrogen chamber is usually an inert gas, such as nitrogen.

[0061] During the implementation process, after the pressure of the test gas reaches the normal operating pressure of the fuel cell stack and stabilizes for a period of time (for example, 3 minutes), the average leakage rate detected by the second gas flowmeter within a preset time (for example, 1 minute) can be obtained, and then the hydrogen leakage rate can be calculated based on the obtained average leakage rate.

[0062] In some embodiments, the average leakage rate may be corrected according to a correction coefficient corresponding to the test gas to obtain the hydrogen leakage rate of the hydrogen cavity.

[0063] It is understandable that the average leakage rate detected by the second gas flow meter needs to be corrected when converted into the hydrogen leakage rate. In the implementation process, the formula v H =2×R×v N The hydrogen cavity leakage rate is calculated, where v H is the hydrogen leakage rate, R is the correction factor, v N is the average leakage rate of the test gas. For different test gases, the correction factor is usually different. When the test gas is nitrogen, the correction factor can be 3.74.

[0064] The hydrogen leakage rate can be accurately obtained through the above-mentioned actual measurement method, thereby improving the accuracy of shell purge control.

[0065] In step 102, the purge interval time is determined according to the volume of the chamber and the hydrogen leakage rate.

[0066] In order to solve the problem of high energy consumption and system efficiency impact of continuous shell purging in related technologies, this application adopts intermittent purging to purge the shell. During the purging process, in order to ensure the hydrogen safety of the fuel cell stack, the leakage threshold of hydrogen from the core to the shell can be determined according to the volume of the cavity; the leakage threshold is divided by the hydrogen leakage rate to obtain the purging interval time.

[0067] As mentioned above, the leakage of hydrogen should be less than or equal to 1% V0, so the leakage threshold can be set to 1% V0. The purge time interval can be calculated using the following formula:

[0068]

[0069] Among them, t c is the purge interval time, Q H is the leakage amount of hydrogen.

[0070] In step 103, the housing is purged according to the purging interval time.

[0071] In the implementation process, you can use Figure 2 The purge device shown is used to purge the shell, specifically: the air inlet valve and the air outlet valve are opened at the same time, the purge gas is provided by the branch flow derived from the air compressor of the fuel cell system, and the purge gas is introduced into the shell through the purge inlet for purge, which quickly reduces the concentration of hydrogen leaked from the core and ensures the safety of hydrogen inside the shell. In addition, the intermittent purge method also reduces the purge energy consumption and improves the efficiency of the fuel cell system.

[0072] In some embodiments, the purge interval time corresponding to the fuel cell stack at different powers may also be determined; and the power of the fuel cell stack and the determined purge interval time are stored in correspondence.

[0073] It is understandable that when the operating power of the fuel cell stack changes, the temperature, humidity, pressure and other conditions inside the core will change, and the hydrogen leakage of the core will also change accordingly. By calibrating the corresponding purge intervals at different powers, the purge interval can be shortened when the hydrogen leakage is large, and extended when the hydrogen leakage is small. In this way, the hydrogen safety can be more refined, the purge energy consumption can be reduced, and the energy efficiency of the fuel cell system can be improved.

[0074] In the above-mentioned fuel cell stack shell purging method, the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity are determined; the purging interval is determined according to the volume of the cavity and the hydrogen leakage rate; and the shell is purged according to the purging interval. While ensuring the safety of hydrogen inside the fuel cell stack shell, the shell is intermittently purged, which reduces the energy consumption of the fuel cell system and improves the energy efficiency of the fuel cell system.

[0075] Based on the same inventive concept, the present application also provides a fuel cell stack housing purge device, referring to Figure 5 , showing a schematic diagram of the structure of an electronic device in an embodiment of the present application, the electronic purge device includes one or more memories 504, one or more processors 502 and at least one computer program (computer program instruction) stored in the memory 504 and executable on the processor 502, and when the processor 502 executes the computer program, the purging method of the fuel cell stack shell as described above is implemented.

[0076] Among them, Figure 5 In the embodiment of the present invention, a bus architecture (represented by bus 500) is shown, which may include any number of interconnected buses and bridges, and bus 500 links various circuits including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 may be used to store data used by processor 502 when performing operations.

[0077] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method described above, for example, including: determining the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity; determining the purge interval time according to the volume of the cavity and the hydrogen leakage rate; and purging the shell according to the purge interval time.

[0078] Based on the same inventive concept, an embodiment of the present application provides a computer program product, including a computer program. When the computer program product is executed by a processor, it prompts the processor to implement the steps of the method described above, for example, including: determining the volume of the cavity between the core and the shell and the hydrogen leakage rate of the hydrogen cavity; determining the purge interval time according to the volume of the cavity and the hydrogen leakage rate; and purging the shell according to the purge interval time.

[0079] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store computer program instructions.

[0083] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for purging a fuel cell stack casing, applied to a purging device for a fuel cell stack casing, characterized in that: The fuel cell stack comprises a core and a shell, wherein the core is disposed in the shell, the core comprises a hydrogen cavity, the fuel cell stack is connected to the purge device, and the method comprises: determining a volume of a cavity between the core and the shell and a hydrogen leakage rate of the hydrogen cavity; Determining a purge interval time according to the volume of the cavity and the hydrogen leakage rate; The housing is purged according to the purging interval.

2. The method for purging a fuel cell stack casing according to claim 1, characterized in that: The purge device includes a purge gas source, an air inlet valve, a gas pressure gauge, a first gas flow meter and an air outlet valve. The shell includes a purge inlet and a purge outlet. The air inlet valve, the gas pressure gauge and the first gas flow meter are arranged on a pipeline from the purge gas source to the purge inlet. The air outlet valve is arranged on a pipeline at the purge outlet. The determining the volume of the cavity between the core and the shell includes: Controlling the air inlet valve to open and controlling the air outlet valve to close; After the test gas is introduced into the purge inlet and the pressure of the test gas reaches a preset test pressure, determining a curve of a first flow rate of the test gas changing with time by the first gas flow meter; The volume of the cavity between the core and the shell is determined according to the variation curve.

3. The method for purging a fuel cell stack casing according to claim 2, characterized in that: Determining the volume of the cavity between the core and the shell according to the change curve includes: Determining the time for the test gas to fill the cavity and the corresponding first flow rate from the change curve; The volume of the cavity between the core and the shell is determined according to the time taken for the test gas to fill the cavity and the corresponding first flow rate.

4. The method for purging a fuel cell stack casing according to claim 1, characterized in that: The purge device includes a second gas flow meter, the core also includes an air cavity and a coolant cavity, the air cavity, the coolant cavity and the hydrogen cavity are separately arranged, the second gas flow meter is arranged at the inlet of the hydrogen cavity, and determines the hydrogen leakage rate of the hydrogen cavity, including: Controlling the inlet of the hydrogen cavity, the inlet of the air cavity and the inlet of the cooling liquid cavity to be opened, and controlling the outlet of the hydrogen cavity, the outlet of the air cavity and the outlet of the cooling liquid cavity to be closed; After the test gas is introduced into the inlet of the hydrogen chamber, the inlet of the air chamber and the inlet of the coolant chamber and the pressure of the test gas reaches the preset stack operating pressure, the average leakage rate of the test gas within a preset time period is determined by the second gas flow meter; The hydrogen leakage rate of the hydrogen chamber is determined according to the average leakage rate.

5. The method for purging a fuel cell stack casing according to claim 4, characterized in that: The step of determining the hydrogen leakage rate of the hydrogen chamber according to the average leakage rate comprises: The average leakage rate is corrected according to the correction coefficient corresponding to the test gas to obtain the hydrogen leakage rate of the hydrogen chamber.

6. The method for purging a fuel cell stack casing according to any one of claims 1 to 5, characterized in that: The step of determining the purge interval time according to the volume of the cavity and the hydrogen leakage rate comprises: determining a leakage threshold of hydrogen from the core to the shell according to the volume of the cavity; The leakage threshold is divided by the hydrogen leakage rate to obtain the purge interval time.

7. The method for purging a fuel cell stack casing according to any one of claims 1 to 5, characterized in that: After the step of determining the purge interval time according to the volume of the cavity and the hydrogen leakage rate, the method further comprises: Determining the purge interval time corresponding to the fuel cell stack at different powers; The power of the fuel cell stack and the determined purge interval are stored in correspondence.

8. An electronic device comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which, when executed by a processor, prompt the processor to implement the steps of the method according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that When the computer program product is executed by a processor, the processor is prompted to implement the steps of the method according to any one of claims 1 to 7.

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