Shutdown purging method, device and equipment of hydrogen fuel cell and storage medium

Abstract

The invention discloses a shutdown purging method, device and equipment for a hydrogen fuel cell and a storage medium. The shutdown purging method for the hydrogen fuel cell comprises the following steps: when a shutdown instruction is received, acquiring an environment temperature; when the environment temperature is lower than or equal to a preset low-temperature threshold temperature, purging the hydrogen fuel cell by using a low-temperature purging scheme; when the environment temperature is higher than a preset low-temperature threshold temperature, purging the hydrogen fuel cell by using a non-low-temperature purging scheme; the low-temperature purging scheme comprises a low-temperature first stage, a low-temperature second stage and a low-temperature third stage; the non-low-temperature purging scheme comprises a non-low-temperature first stage and a non-low-temperature second stage. According to the technical scheme provided by the invention, the hydrogen fuel cell can be purged according to the conditions of low-temperature and non-low-temperature environment temperatures, and the safety and stability of the hydrogen fuel cell are ensured under the condition of excessive purge without wasting resources.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and particularly to a method, device, equipment and storage medium for purging a hydrogen fuel cell during shutdown. Background Art

[0002] A hydrogen fuel cell uses hydrogen as fuel to undergo an electrochemical reaction with oxygen in the air to generate electrical energy for a vehicle to run. During the process of generating electrical energy, a large amount of water is generated by the electrochemical reaction. Part of this water is discharged into the atmosphere with the air, and part of the water remains in the hydrogen fuel cell to moisten the proton exchange membrane and reaction gas. When the hydrogen fuel cell system is operating, due to a large concentration difference of water on both sides of the cathode and anode of the fuel cell, the water on the cathode side will permeate to the anode side. When the hydrogen fuel cell vehicle shuts down, the water generated electrochemically by the hydrogen fuel cell remains on both sides of the cathode and anode of the fuel cell, and there is also some water in the components of the fuel cell system. In a non-low-temperature environment, when the hydrogen fuel cell system shuts down, too much water remaining inside the hydrogen fuel cell will prevent the transmission of reaction gas. In a low-temperature environment, when the hydrogen fuel cell system shuts down, the water inside the hydrogen fuel cell will freeze, which will further damage the internal structure of the hydrogen fuel cell, resulting in an impact on the supply of reaction gas. In addition, the water remaining in the components of the hydrogen fuel cell freezes, which will make it difficult to start the hydrogen fuel cell. How to properly solve the above problems has become an urgent issue in the industry. Summary of the Invention

[0003] The present invention provides a method, device, equipment and storage medium for purging a hydrogen fuel cell during shutdown, which is used to select a corresponding purging method to purge the hydrogen fuel cell according to different ambient temperatures to remove the excess water inside.

[0004] According to a first aspect of the present invention, a method for purging a hydrogen fuel cell during shutdown is provided. The method for purging a hydrogen fuel cell during shutdown includes:

[0005] When receiving a shutdown instruction, obtain the ambient temperature;

[0006] When the ambient temperature is lower than or equal to a preset low-temperature threshold temperature, use a low-temperature purging scheme to purge the hydrogen fuel cell;

[0007] When the ambient temperature is higher than the preset low-temperature threshold temperature, use a non-low-temperature purging scheme to purge the hydrogen fuel cell;

[0008] It further includes:

[0009] The low-temperature purging scheme includes a low-temperature first stage, a low-temperature second stage and a low-temperature third stage; the non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage;

[0010] During the first low-temperature stage and the first non-low-temperature stage, purge the anode flow field of the hydrogen fuel cell on the anode side and purge the cathode flow field of the hydrogen fuel cell on the cathode side;

[0011] During the second low-temperature stage and the second non-low-temperature stage, purge the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump on the anode side, and purge the tail gas pipe on the cathode side;

[0012] During the third low-temperature stage, purge the gas-water separator and the nitrogen and water discharge valve on the anode side, and purge the tail gas pipe on the cathode side.

[0013] In one embodiment, the first low-temperature stage includes:

[0014] On the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at a first rotational speed so that the water in the anode flow field of the hydrogen fuel cell is drained into the gas-water separator;

[0015] On the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the intake air purges the cathode flow field of the hydrogen fuel cell with a first intake air flow rate so that the water in the cathode flow field of the hydrogen fuel cell is drained to the tail gas pipe;

[0016] When the impedance value of the hydrogen fuel cell is detected to be a preset first threshold, end the first low-temperature stage. Among them, in the first low-temperature stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously.

[0017] In one embodiment, the second low-temperature stage includes:

[0018] On the anode side of the hydrogen fuel cell, the hydrogen circulation pump operates at a second rotational speed, and the hydrogen injector provides a gas pressure wave to the low-pressure pipeline to purge the water in the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump so that the water in the hydrogen circulation pump is drained into the gas-water separator, and open the drain and nitrogen discharge valve so that the water in the gas-water separator can be discharged, where the second rotational speed is less than the first rotational speed;

[0019] On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, use the intake air with a second intake air flow rate to purge the water discharged to the tail gas pipe on the anode side, where the second intake air volume is less than the first intake air volume;

[0020] When it is monitored that the duration for the water level in the gas-water separator to reach a certain water level reaches a preset first duration, end the second low-temperature stage.

[0021] In one embodiment, the third low-temperature stage includes:

[0022] On the anode side of the hydrogen fuel cell, set the rotational speed of the hydrogen circulation pump to 0, and use the pressure provided by the hydrogen injector to form a gas pressure wave to purge the water in the gas-water separator and the nitrogen and water discharge valve, so that the water in the nitrogen and water discharge valve is discharged to the tail pipe;

[0023] On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, use the intake air with the third intake flow rate to purge the water discharged to the tail pipe on the anode side, where the third intake air volume is less than or equal to the second intake air volume;

[0024] When it is monitored that the water level in the gas-water separator is lower than the first closing threshold, end the low-temperature third stage, close the hydrogen injector, close the air seal valve, the air pressure regulating valve, and the air bypass valve, and stop operating the air compressor.

[0025] In one embodiment, the non-low-temperature first stage includes:

[0026] On the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at the third rotational speed, so that the water in the anode flow field of the hydrogen fuel cell is discharged to the gas-water separator, where the third rotational speed is less than the first rotational speed;

[0027] On the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, use the intake air with the fourth intake flow rate to purge the cathode flow field of the hydrogen fuel cell, so that the water in the cathode flow field of the hydrogen fuel cell is discharged to the tail pipe, where the fourth intake air flow rate is less than or equal to the first intake air flow rate;

[0028] When it is detected that the impedance value of the hydrogen fuel cell is the preset second threshold, end the non-low-temperature first stage, where in the non-low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously, and the second threshold is less than the first threshold.

[0029] In one embodiment, the non-low-temperature second stage includes:

[0030] On the anode side of the hydrogen fuel cell, set the rotational speed of the hydrogen circulation pump to 0, and use the pressure provided by the hydrogen injector to form a gas pressure wave to purge the water in the gas-water separator and the nitrogen and water discharge valve, so that the water in the nitrogen and water discharge valve is discharged to the tail pipe;

[0031] On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, use the intake air with the fifth intake flow rate to purge the water discharged to the tail pipe on the anode side;

[0032] When it is detected that the water level in the gas-water separator is lower than the second closing threshold, the non-low-temperature second stage is ended, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve and the air bypass valve are closed, and the air compressor is stopped. The second closing threshold is greater than the first closing threshold.

[0033] According to a second aspect of the present invention, there is provided a shutdown purge device for a hydrogen fuel cell, comprising:

[0034] An acquisition module, configured to acquire the ambient temperature when a shutdown instruction is received;

[0035] A low-temperature purge module, configured to purge the hydrogen fuel cell using a low-temperature purge scheme when the ambient temperature is lower than a preset low-temperature threshold temperature;

[0036] A non-low-temperature purge module, configured to purge the hydrogen fuel cell using a non-low-temperature purge scheme when the ambient temperature is higher than a preset low-temperature threshold temperature;

[0037] The shutdown purge device for the hydrogen fuel cell is further configured that the low-temperature purge scheme includes: a low-temperature first stage, a low-temperature second stage and a low-temperature third stage; the non-low-temperature purge scheme includes a non-low-temperature first stage and a non-low-temperature second stage; in the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the anode flow field outlet of the hydrogen fuel cell and the hydrogen circulation pump are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side.

[0038] According to a third aspect of the present invention, there is provided an electronic device, which includes: a processor and a memory storing computer program instructions;

[0039] When the processor executes the computer program instructions, any one of the above-mentioned hydrogen fuel cell shutdown purge methods is implemented.

[0040] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, characterized in that computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, any one of the above-mentioned hydrogen fuel cell shutdown purge methods is implemented.

[0041] In summary, the present invention provides a method and device for purging a hydrogen fuel cell during shutdown. The method includes: when a shutdown instruction is received, obtaining the ambient temperature; when the ambient temperature is less than or equal to a preset low-temperature threshold temperature, using a low-temperature purging scheme to purge the hydrogen fuel cell; when the ambient temperature is higher than the preset low-temperature threshold temperature, using a non-low-temperature purging scheme to purge the hydrogen fuel cell; the low-temperature purging scheme includes: a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage. Through the technical solution of the present application, the hydrogen fuel cell can be purged in different cases according to two ambient temperature conditions of low temperature and non-low temperature, ensuring the safety and stability of the hydrogen fuel cell without wasting resources for excessive purging.

[0042] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by practicing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the written specification, claims, and drawings.

[0043] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a flowchart of a method for purging a hydrogen fuel cell during shutdown provided by an embodiment of the present invention;

[0046] Figure 2 It is a flowchart of another method for purging a hydrogen fuel cell during shutdown provided by an embodiment of the present invention;

[0047] Figure 3 It is a flowchart of another method for purging a hydrogen fuel cell during shutdown provided by an embodiment of the present invention;

[0048] Figure 4 It is a flowchart of another method for purging a hydrogen fuel cell during shutdown provided by an embodiment of the present invention;

[0049] Figure 5 It is a flowchart of another method for purging a hydrogen fuel cell during shutdown provided by an embodiment of the present invention;

[0050] Figure 6 Another flowchart of the hydrogen fuel cell shutdown purge method provided by an embodiment of the present invention;

[0051] Figure 7 A structural diagram of a hydrogen fuel cell shutdown purge device provided by an embodiment of the present invention;

[0052] Figure 8 A structural diagram of an electronic device provided by an embodiment of the present invention;

[0053] Figure 9 A schematic diagram of the hardware structure of the hydrogen fuel cell shutdown purge provided by an embodiment of the present invention. Detailed implementation manners

[0054] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0055] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "comprising..." do not preclude the existence of additional identical elements in the process, method, article or device comprising the said elements.

[0056] As Figure 1 shown, the present invention provides a hydrogen fuel cell shutdown purge method, and the hydrogen fuel cell shutdown purge method includes:

[0057] In step S11, when a shutdown instruction is received, the ambient temperature is acquired;

[0058] In step S12, when the ambient temperature is less than or equal to a preset low temperature threshold, a low temperature purge scheme is used to purge the hydrogen fuel cell;

[0059] In step S13, when the ambient temperature is higher than a preset low-temperature threshold temperature, a non-low-temperature purging scheme is used to purge the hydrogen fuel cell.

[0060] In one embodiment, according to different purging regions, the low-temperature purging scheme includes a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage. In the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side. In some cases, the hydrogen fuel cell may be in an environment with a relatively low temperature. When the temperature is below 0 degrees, the moisture in the hydrogen fuel cell may freeze, resulting in the inability to start the hydrogen fuel cell the next time. For example, when a vehicle equipped with a hydrogen fuel cell parks in an outdoor parking lot and the outdoor temperature is relatively low, the freezing of the moisture in the hydrogen fuel cell needs to be considered. The hydrogen fuel cell uses hydrogen as fuel to undergo an electrochemical reaction with oxygen in the air to generate electrical energy for the vehicle to travel. During the generation of electrical energy, a large amount of water is generated by the electrochemical reaction. Part of this water is discharged into the atmosphere with the air, and part of the water remains in the hydrogen fuel cell to moisten the proton exchange membrane and the reaction gas. When the hydrogen fuel cell system is operating, due to a large concentration difference of moisture on both sides of the cathode and anode of the fuel cell, the water on the cathode side will penetrate to the anode side. When the hydrogen fuel cell vehicle shuts down, the water generated electrochemically by the hydrogen fuel cell remains on both sides of the cathode and anode of the fuel cell, and there is also some water in the components of the fuel cell system. Therefore, when the hydrogen fuel cell system receives a shutdown command, it needs to obtain the ambient temperature of the environment according to a preset temperature acquisition device. The preset low-temperature threshold temperature is in the temperature range of 0° to 5°. In a preferred embodiment, 0° is used as the preset low-temperature threshold temperature. When the ambient temperature is lower than or equal to the preset low-temperature threshold temperature, the low-temperature purging scheme is used to purge the hydrogen fuel cell. When the ambient temperature is higher than the preset low-temperature threshold temperature, the non-low-temperature purging scheme is used to purge the hydrogen fuel cell. In the prior art, when a hydrogen fuel cell vehicle shuts down, only the anode and cathode of the fuel cell are purged for a fixed time. The non-low-temperature purging scheme and the low-temperature purging scheme of this embodiment are different from the fixed-duration purging scheme in the prior art. In a non-low-temperature environment, when the hydrogen fuel cell system shuts down, too much water remains inside the hydrogen fuel cell, which will prevent the transmission of reaction gases. In a low-temperature environment, when the hydrogen fuel cell system shuts down, the water inside the hydrogen fuel cell freezes, which will damage the internal structure of the hydrogen fuel cell, resulting in an impact on the supply of reaction gases. Moreover, the freezing of the water remaining in the components of the hydrogen fuel cell will make it difficult to start the hydrogen fuel cell. Figure 9It is a schematic diagram of the hardware structure for purging during the shutdown of a hydrogen fuel cell. Specifically, this low-temperature purging scheme includes a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; this non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage.

[0061] The technical solution in this embodiment can purge the hydrogen fuel cell in two cases of low temperature and non-low temperature environments, ensuring the safety and stability of the hydrogen fuel cell without wasting resources for excessive purging.

[0062] In one embodiment, as Figure 2 shown, the low-temperature first stage includes the following steps S21 - S23:

[0063] In step S21, on the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at a first rotational speed, so that the water in the anode flow field of the hydrogen fuel cell is discharged into the gas-water separator;

[0064] In step S22, on the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the intake air purges the cathode flow field of the hydrogen fuel cell with a first intake air flow rate, so that the water in the cathode flow field of the hydrogen fuel cell is discharged to the tail pipe;

[0065] In step S23, when the impedance value of the hydrogen fuel cell is detected to be a preset first threshold, the low-temperature first stage ends. Among them, in the low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously.

[0066] In one embodiment, on the anode side of the hydrogen fuel cell in the low-temperature first stage, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at a first rotational speed, aiming to purge the anode flow field of the hydrogen fuel cell with a relatively large hydrogen flow rate and discharge the water in the anode flow field of the hydrogen fuel cell into the gas-water separator. Among them, the first rotational speed is not limited to the value of 4000 rpm, and the preferred value of the first rotational speed is 4000 rpm (revolutions per minute).

[0067] On the cathode side of the hydrogen fuel cell in the low-temperature first stage, under the conditions that the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the intake air purges the cathode flow field of the hydrogen fuel cell with a first intake air flow rate, aiming to discharge the water in the cathode flow field of the hydrogen fuel cell to the tail pipe. Among them, the preferred value of the first intake air flow rate is 1200 L / min (liters per minute), and the first intake air flow rate is not limited to the value of 1200 L / min.

[0068] The impedance value of a hydrogen fuel cell is closely related to the moisture inside it. When there is less moisture inside, the impedance value of the hydrogen fuel cell is larger. When the impedance value of the hydrogen fuel cell is detected to be a preset first threshold, it means that the moisture in the hydrogen fuel cell has become less, and the first low-temperature stage can be ended and the second low-temperature stage can be started. In this first low-temperature stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously.

[0069] In one embodiment, as Figure 3 shown, this second low-temperature stage includes the following steps S31 - S33:

[0070] In step S31, on the anode side of the hydrogen fuel cell, the hydrogen circulation pump operates at a second rotational speed, and the hydrogen injector provides a gas pressure wave to the low-pressure pipeline to purge the water in the anode flow field outlet of the hydrogen fuel cell and the hydrogen circulation pump, so that the water in the hydrogen circulation pump is drained to the gas-water separator, where the second rotational speed is less than the first rotational speed;

[0071] In step S32, on the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the intake air with a second intake flow rate is used to purge the water discharged from the anode side into the tail pipe, and the drain and nitrogen discharge valve is opened so that the water in the gas-water separator can be discharged, where the second intake air volume is less than the first intake air volume;

[0072] In step S33, when the duration for which the water level in the gas-water separator reaches a certain water level reaches a preset first duration, the second low-temperature stage is ended.

[0073] In one embodiment, on the anode side of the hydrogen fuel cell in the second low-temperature stage, the hydrogen circulation pump operates at a second rotational speed. Among them, the preferred value for operating at this second rotational speed is 2000 rpm, and the water in the anode flow field of the hydrogen fuel cell is continuously purged. The hydrogen injector provides a gas pressure wave to the low-pressure pipeline to purge the water in the anode flow field outlet of the hydrogen fuel cell and the hydrogen circulation pump. The purpose is to drain the water in the hydrogen circulation pump to the gas-water separator so that there is almost no water in the hydrogen circulation pump. The gas pressure wave refers to the elastic wave in the gas, which is composed of a high-pressure wave and a low-pressure wave. The gas is easily compressed. When a pressure change is excited in the gas, the density of the gas will produce a change in the same form as the pressure. Also, the second rotational speed is not limited to the value of 2000 rpm. The magnitude relationship between the second rotational speed and the first rotational speed is determined, and the second rotational speed is less than the first rotational speed. Opening the nitrogen and water discharge valve can drain the water in the gas-water separator to the tail pipe.

[0074] On the cathode side of the hydrogen fuel cell in the second low-temperature stage, with the air seal valve fully closed, the air pressure regulating valve fully closed, and the air bypass valve fully open, the drain and nitrogen purge valve is opened on the anode side to drain the water in the gas-water separator into the tail pipe. The anode side is purged with intake air at the second intake flow rate to remove the water drained into the tail pipe, which can better remove the water in the tail pipe. In addition, since hydrogen is used for purging on the anode side and air is used for purging on the cathode side, the hydrogen content in the gas in the tail pipe can be reduced to a safe value to meet the corresponding regulatory requirements. Among them, the preferred value of the second intake air volume is 600 L / min, and the numerical relationship between the second intake air volume and the first intake air volume is that the second intake air volume is less than the first intake air volume.

[0075] When it is monitored that the duration for the water level in the gas-water separator to reach a certain level reaches a preset first duration, it indicates that there is almost no water left in the anode flow field and the hydrogen circulation pump of the hydrogen fuel cell, and the second low-temperature stage ends. Among them, the preferred embodiment of the preset first duration is 2 minutes.

[0076] In one embodiment, as Figure 4 shown, the third low-temperature stage includes the following steps S41 - S43:

[0077] In step S41, on the anode side of the hydrogen fuel cell, the rotation speed of the hydrogen circulation pump is set to 0, and a gas pressure wave is formed by providing pressure through the hydrogen injector to purge the water in the gas-water separator and the drain and nitrogen purge valve, so that the water in the drain and nitrogen purge valve is drained into the tail pipe;

[0078] In step S42, on the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the anode side is purged with intake air at the third intake flow rate to remove the water drained into the tail pipe, where the third intake air volume is less than or equal to the second intake air volume;

[0079] In step S43, when it is monitored that the water level in the gas-water separator is lower than the first closing threshold, the third low-temperature stage ends, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the air compressor is stopped.

[0080] In one embodiment, on the anode side of the hydrogen fuel cell in the third low-temperature stage, the rotation speed of the hydrogen circulation pump is set to 0. Since there is almost no water left in the gas circulation system of the anode flow field and the hydrogen circulation pump of the hydrogen fuel cell, there is no need to start the hydrogen circulation pump. It is only necessary to form a gas pressure wave by providing pressure through the hydrogen injector to purge the water in the gas-water separator and the drain and nitrogen purge valve, so that the water in the drain and nitrogen purge valve is drained into the tail pipe.

[0081] The cathode side of the hydrogen fuel cell in the third low-temperature stage is the same as that of the hydrogen fuel cell in the second low-temperature stage. On the cathode side of the hydrogen fuel cell in the third low-temperature stage, when the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the intake air with the third intake flow rate is used to purge the water discharged to the tail pipe on the anode side, which can better remove the water in the tail pipe. In addition, since hydrogen is used for purging on the anode side and air is used for purging on the cathode side, the hydrogen content in the gas in the tail pipe can be reduced to a safe value, meeting the corresponding regulatory requirements. Among them, the preferred value of the third intake air volume is 500 L / min, and the numerical relationship between the third intake air volume and the second intake air volume is that the second intake air volume is less than or equal to the first intake air volume.

[0082] When it is monitored that the water level in the gas-liquid separator is lower than the first closing threshold, the third low-temperature stage is ended, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the air compressor is stopped. Among them, even if the water in the gas-liquid separator freezes at the first closing threshold, it does not affect the overall performance of the hydrogen fuel cell.

[0083] In one embodiment, as Figure 5 shown, the non-low-temperature first stage includes the following steps S51 - S53:

[0084] In step S51, on the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at the third rotational speed so that the water in the anode flow field of the hydrogen fuel cell is discharged into the gas-liquid separator, where the third rotational speed is less than the first rotational speed;

[0085] In step S52, on the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the intake air with the fourth intake flow rate is used to purge the cathode flow field of the hydrogen fuel cell so that the water in the cathode flow field of the hydrogen fuel cell is discharged into the tail pipe, where the fourth intake flow rate is less than or equal to the first intake flow rate;

[0086] In step S53, when it is detected that the impedance value of the hydrogen fuel cell is the preset second threshold, the non-low-temperature first stage is ended. Among them, in the non-low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously, where the second threshold is less than the first threshold.

[0087] In one embodiment, on the anode side of the hydrogen fuel cell in the non-low-temperature first stage, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at the third rotational speed, and the purpose is to discharge the water in the anode flow field of the hydrogen fuel cell into the gas-liquid separator. Among them, the preferred value of the third rotational speed is 2000 rpm, and the third rotational speed is less than the first rotational speed.

[0088] On the cathode side of the hydrogen fuel cell in the non-low-temperature first stage, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the cathode flow field of the hydrogen fuel cell is purged with intake air at a fourth intake air flow rate. The purpose is to drain the water in the cathode flow field of the hydrogen fuel cell to the tail pipe. Among them, the preferred value of the fourth intake air flow rate is 1000 L / min, and the fourth intake air flow rate is less than or equal to the first intake air flow rate.

[0089] When the impedance value of the hydrogen fuel cell is detected to be a preset second threshold, the non-low-temperature first stage ends. Among them, in this non-low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously, and the second threshold is less than the first threshold. In a non-low-temperature environment, it is allowed that there is a part of water in the hydrogen fuel cell. Therefore, the impedance value of the hydrogen fuel cell in the non-low-temperature environment is lower than that of the hydrogen fuel cell in the low-temperature environment. When the impedance value of the hydrogen fuel cell is detected to be a preset second threshold, the non-low-temperature first stage ends. Among them, in this non-low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously, and the second threshold is less than the first threshold.

[0090] In one embodiment, as Figure 6 shown, the non-low-temperature second stage includes the following steps S61 - S63:

[0091] In step S61, on the anode side of the hydrogen fuel cell, the rotational speed of the hydrogen circulation pump is set to 0, and a gas pressure wave is formed by the pressure provided by the hydrogen injector to purge the water in the gas-liquid separator and the nitrogen and water discharge valve, so that the water in the nitrogen and water discharge valve is drained to the tail pipe;

[0092] In step S62, on the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the water discharged from the anode side to the tail pipe is purged with intake air at a fifth intake air flow rate, and the fifth intake air flow rate is less than the fourth intake air flow rate;

[0093] In step S63, when it is monitored that the water level in the gas-liquid separator is lower than the second closing threshold, the non-low-temperature second stage ends, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the air compressor is stopped. The second closing threshold is greater than the first closing threshold.

[0094] In one embodiment, on the anode side of the hydrogen fuel cell in the non-low-temperature second stage, the rotational speed of the hydrogen circulation pump is set to 0, and there is no need to continue purging the water in the hydrogen fuel cell. A gas pressure wave is formed by the pressure provided by the hydrogen injector to purge the water in the gas-liquid separator and the nitrogen and water discharge valve, so that the water in the nitrogen and water discharge valve is drained to the tail pipe.

[0095] On the cathode side of the hydrogen fuel cell in the non-low-temperature second stage, under the conditions that the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the anode side is purged with intake air at the fifth intake air flow rate to remove the water discharged into the tail gas pipe. Among them, the preferred value of the fifth intake air flow rate is 600 L / min, and the fifth intake air flow rate is less than the fourth intake air flow rate.

[0096] When it is monitored that the water level in the gas-water separator is lower than the second closing threshold, the non-low-temperature second stage is ended, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the operation of the air compressor is stopped. In a non-low-temperature environment, since icing does not occur, it is allowed that the water level in the gas-water separator in the non-low-temperature environment is higher than the water level in the gas-water separator in the low-temperature environment, that is, the second closing threshold is greater than the first closing threshold.

[0097] In one embodiment, Figure 7 is a block diagram of a hydrogen fuel cell shutdown purge device shown according to an exemplary embodiment. As Figure 7 shown, the hydrogen fuel cell shutdown purge device includes an acquisition module 71, a low-temperature purge module 72, and a non-low-temperature purge module 73.

[0098] The acquisition module 71 is configured to acquire the ambient temperature when receiving a shutdown instruction;

[0099] The low-temperature purge module 72 is configured to purge the hydrogen fuel cell using a low-temperature purge scheme when the ambient temperature is lower than a preset low-temperature threshold temperature;

[0100] The non-low-temperature purge module 73 is configured to purge the hydrogen fuel cell using a non-low-temperature purge scheme when the ambient temperature is higher than a preset low-temperature threshold temperature;

[0101] The hydrogen fuel cell shutdown purge device is further configured that the low-temperature purge scheme includes: a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purge scheme includes a non-low-temperature first stage and a non-low-temperature second stage; in the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the anode flow field outlet and the hydrogen circulation pump of the hydrogen fuel cell are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side;

[0102] The acquisition module 71, the low-temperature purge module 72, and the non-low-temperature purge module 73 included in the block diagram of the hydrogen fuel cell shutdown purge device are controlled to execute the hydrogen fuel cell shutdown purge method described in any of the above embodiments.

[0103] AsFigure 8 As shown in the figure, the present invention provides an electronic device 800, which includes: a processor 801 and a memory 802 storing computer program instructions;

[0104] When the processor 801 executes the computer program instructions and receives a shutdown instruction, it obtains the ambient temperature; when the ambient temperature is less than or equal to a preset low-temperature threshold temperature, it uses a low-temperature purging scheme to purge the hydrogen fuel cell; when the ambient temperature is higher than the preset low-temperature threshold temperature, it uses a non-low-temperature purging scheme to purge the hydrogen fuel cell; the low-temperature purging scheme includes: a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage; in the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side.

[0105] The present invention provides a computer-readable storage medium with computer program instructions stored thereon. When the computer program instructions are executed by a processor and receive a shutdown instruction, it obtains the ambient temperature; when the ambient temperature is less than or equal to a preset low-temperature threshold temperature, it uses a low-temperature purging scheme to purge the hydrogen fuel cell; when the ambient temperature is higher than the preset low-temperature threshold temperature, it uses a non-low-temperature purging scheme to purge the hydrogen fuel cell; the low-temperature purging scheme includes: a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage; in the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side.

[0106] It should be understood that the specific features, operations, and details described above regarding the method of the present invention can also be similarly applied to the apparatus and system of the present invention, or vice versa. Additionally, each step of the method of the present invention described above can be executed by the corresponding components or units of the apparatus or system of the present invention.

[0107] It should be understood that each module / unit of the device of the present invention can be implemented in whole or in part by software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the computer device in the form of hardware or firmware, or independent of the processor, or stored in the memory of the computer device in the form of software for the processor to call to execute the operations of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0108] In one embodiment, a computer device is provided, which includes a memory and a processor. A computer instruction executable by the processor is stored on the memory. When the computer instruction is executed by the processor, it instructs the processor to execute the steps of the method of the embodiment of the present invention. The computer device can be generally a server, a terminal, or any other electronic device having the necessary computing and / or processing capabilities. In one embodiment, the computer device may include a processor, a memory, a network interface, a communication interface, etc. connected through a system bus. The processor of the computer device can be used to provide the necessary computing, processing, and / or control capabilities. The memory of the computer device can include a non-volatile storage medium and an internal memory. An operating system, a computer program, etc. can be stored in or on the non-volatile storage medium. The internal memory can provide an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface and the communication interface of the computer device can be used to connect and communicate with external devices through a network. When the computer program is executed by the processor, it executes the steps of the method of the present invention.

[0109] The present invention can be implemented as a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it causes the steps of the method of the embodiment of the present invention to be executed. In one embodiment, the computer program is distributed on a plurality of network-coupled computer devices or processors, so that the computer program is stored, accessed, and executed in a distributed manner by one or more computer devices or processors. A single method step / operation, or two or more method steps / operations, can be executed by a single computer device or processor or by two or more computer devices or processors. One or more method steps / operations can be executed by one or more computer devices or processors, and one or more other method steps / operations can be executed by one or more other computer devices or processors. One or more computer devices or processors can execute a single method step / operation, or execute two or more method steps / operations.

[0110] Those of ordinary skill in the art can understand that the method steps of the present invention can be implemented by a computer program to direct relevant hardware such as a computer device or a processor. The computer program can be stored in a non-transitory computer-readable storage medium. When the computer program is executed, the steps of the present invention are caused to be executed. Depending on the context, any reference herein to memory, storage, database, or other media may include non-volatile and / or volatile memory. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk, etc. Examples of volatile memory include random access memory (RAM), external cache memory, etc.

[0111] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such a combination is not contradictory.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shutdown purge method for a hydrogen fuel cell, characterized in that Including: When a shutdown instruction is received, obtain the ambient temperature; When the ambient temperature is less than or equal to a preset low-temperature threshold temperature, use a low-temperature purging scheme to purge the hydrogen fuel cell; When the ambient temperature is higher than the preset low-temperature threshold temperature, use a non-low-temperature purging scheme to purge the hydrogen fuel cell; Also including: The low-temperature purging scheme includes a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; The non-low-temperature purging scheme includes a non-low-temperature first stage and a non-low-temperature second stage; In the low-temperature first stage and the non-low-temperature first stage, purge the anode flow field of the hydrogen fuel cell on the anode side and purge the cathode flow field of the hydrogen fuel cell on the cathode side; In the low-temperature second stage and the non-low-temperature second stage, purge the anode flow field outlet of the hydrogen fuel cell and the hydrogen circulation pump on the anode side and purge the tail gas pipe on the cathode side; In the low-temperature third stage, purge the gas-water separator and the nitrogen and water discharge valve on the anode side and purge the tail gas pipe on the cathode side.

2. The method according to claim 1, characterized in that, The low-temperature first stage includes: On the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at a first rotational speed so that the water in the anode flow field of the hydrogen fuel cell is drained into the gas-water separator; On the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the intake air purges the cathode flow field of the hydrogen fuel cell with a first intake air flow rate so that the water in the cathode flow field of the hydrogen fuel cell is drained to the tail gas pipe; When it is detected that the impedance value of the hydrogen fuel cell is a preset first threshold, end the low-temperature first stage. Among them, in the low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started simultaneously and ended simultaneously.

3. The hydrogen fuel cell shutdown purge method according to claim 2, wherein The low-temperature second stage includes: On the anode side of the hydrogen fuel cell, the hydrogen circulation pump operates at a second rotational speed, and the hydrogen injector provides a gas pressure wave to the low-pressure pipeline to purge the water in the anode flow field outlet of the hydrogen fuel cell and the hydrogen circulation pump so that the water in the hydrogen circulation pump is drained into the gas-water separator, and the drain nitrogen and water valve is opened so that the water in the gas-water separator can be drained, where the second rotational speed is less than the first rotational speed; On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, use the intake air with a second intake air flow rate to purge the water discharged from the anode side to the tail gas pipe, where the second intake air volume is less than the first intake air volume; When it is monitored that the duration for the water level in the gas-water separator to reach a certain water level reaches a preset first duration, end the low-temperature second stage.

4. The hydrogen fuel cell shutdown purging method according to claim 3, characterized in that, The low-temperature third stage includes: On the anode side of the hydrogen fuel cell, set the rotational speed of the hydrogen circulation pump to 0, and use the hydrogen injector to provide pressure to form a gas pressure wave to purge the water in the gas-water separator and the nitrogen and water discharge valve so that the water in the nitrogen and water discharge valve is drained to the tail gas pipe; On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, use the intake air with a third intake air flow rate to purge the water discharged from the anode side to the tail gas pipe, where the third intake air volume is less than or equal to the second intake air volume; When the water level in the gas-water separator is detected to be lower than the first closing threshold, the third low-temperature stage is ended, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the air compressor is stopped.

5. The hydrogen fuel cell shutdown purge method according to claim 2, characterized in that, The non-low-temperature first stage includes: On the anode side of the hydrogen fuel cell, the hydrogen circulation pump purges the anode flow field of the hydrogen fuel cell at a third rotational speed so that the water in the anode flow field of the hydrogen fuel cell is discharged into the gas-water separator, where the third rotational speed is less than the first rotational speed; On the cathode side of the hydrogen fuel cell, while the air seal valve is fully open, the air pressure regulating valve is fully open, and the air bypass valve is fully closed, the cathode flow field of the hydrogen fuel cell is purged with intake air at a fourth intake air flow rate so that the water in the cathode flow field of the hydrogen fuel cell is discharged to the tail gas pipe, where the fourth intake air flow rate is less than or equal to the first intake air flow rate; When the impedance value of the hydrogen fuel cell is detected to be a preset second threshold, the non-low-temperature first stage is ended. In the non-low-temperature first stage, the anode side and the cathode side of the hydrogen fuel cell are started and ended simultaneously, where the second threshold is less than the first threshold.

6. The hydrogen fuel cell shutdown purge method according to claim 5, wherein The non-low-temperature second stage includes: On the anode side of the hydrogen fuel cell, the rotational speed of the hydrogen circulation pump is set to 0, and a gas pressure wave is formed by the pressure provided by the hydrogen injector to purge the water in the gas-water separator and the nitrogen and water discharge valve so that the water in the nitrogen and water discharge valve is discharged to the tail gas pipe; On the cathode side of the hydrogen fuel cell, while the air seal valve is fully closed, the air pressure regulating valve is fully closed, and the air bypass valve is fully open, the water discharged from the anode side to the tail gas pipe is purged with intake air at a fifth intake air flow rate; When the water level in the gas-water separator is detected to be lower than the second closing threshold, the non-low-temperature second stage is ended, the hydrogen injector is closed, the air seal valve, the air pressure regulating valve, and the air bypass valve are closed, and the air compressor is stopped. The second closing threshold is greater than the first closing threshold.

7. A shutdown purge device for a hydrogen fuel cell, characterized in that, Includes: An acquisition module for acquiring the ambient temperature when a shutdown instruction is received; A low-temperature purge module for purging the hydrogen fuel cell using a low-temperature purge scheme when the ambient temperature is lower than a preset low-temperature threshold temperature; A non-low-temperature purge module for purging the hydrogen fuel cell using a non-low-temperature purge scheme when the ambient temperature is higher than a preset low-temperature threshold temperature; The hydrogen fuel cell shutdown purge device is further used for the low-temperature purge scheme including: a low-temperature first stage, a low-temperature second stage, and a low-temperature third stage; the non-low-temperature purge scheme includes a non-low-temperature first stage and a non-low-temperature second stage; in the low-temperature first stage and the non-low-temperature first stage, the anode flow field of the hydrogen fuel cell is purged on the anode side, and the cathode flow field of the hydrogen fuel cell is purged on the cathode side; in the low-temperature second stage and the non-low-temperature second stage, the outlet of the anode flow field of the hydrogen fuel cell and the hydrogen circulation pump are purged on the anode side, and the tail gas pipe is purged on the cathode side; in the low-temperature third stage, the gas-water separator and the nitrogen and water discharge valve are purged on the anode side, and the tail gas pipe is purged on the cathode side.

8. A computing device, characterized in that, Includes: A communication interface, a processor, and a memory; Among them, the memory is used to store program instructions, and when the program instructions are executed by the processor, the computing device implements the hydrogen fuel cell shutdown purge method according to any one of claims 1 to 6.

9. A computer-readable storage medium having program instructions stored thereon, characterized in that, When the program instructions are executed by a computer, the computer implements the hydrogen fuel cell shutdown purge method according to any one of claims 1 to 6.

Images