Fuel cell stack scavenging system, control method, computer equipment and storage medium

Abstract

The present invention relates to a fuel cell stack scavenging system, a control method, a computer device, and a storage medium, comprising: a housing and a fuel cell stack installed in the housing; an air system; a tail exhaust system; a scavenging pipeline; an emergency system; and a gas storage and humidification device. The present invention achieves the purpose of purging the interior space of the housing by connecting the scavenging pipeline to the air system and the tail exhaust system respectively, ensuring that the hydrogen concentration in the housing does not become too high. By providing an emergency system, the hydrogen in the housing can still be quickly discharged even if the scavenging pipeline is blocked. By providing a gas storage and humidification device, the vehicle can still operate normally in spaces with slow air flow, such as tunnels or parking lots. The hydrogen in the housing will not be discharged to the outside, thus preventing hydrogen accumulation in the outside world. At the same time, because the gas storage and humidification device can humidify the stored gas, the gas humidified by the gas storage and humidification device can directly enter the fuel cell stack, thereby reducing the burden on the humidifier.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a fuel cell stack scavenging system, a control method, a computer device, and a storage medium. Background Art

[0002] The fuel cell stack is placed inside a shell. When the fuel cell is running, hydrogen will continuously seep out from the inside of the stack and accumulate in the shell. Therefore, the stack shell needs to be continuously purged to blow out the hydrogen and reduce the hydrogen concentration inside the shell to ensure the safe operation of the fuel cell system.

[0003] Normally, a fuel cell system scavenge the shell by diverting the air flow from the air compressor. However, when the shell scavenge line is blocked, the shell scavenge method will fail, and the hydrogen leaking from the fuel cell stack will continue to accumulate in the shell and cannot be discharged. When the hydrogen concentration reaches a certain range, combustion or even explosion accidents are likely to occur, posing a huge safety hazard.

[0004] Therefore, an emergency measure and judgment method are needed for when the purge pipe of the fuel cell shell is blocked. When the purge pipe is confirmed to be blocked, effective measures can be taken to promptly remove the hydrogen in the shell to ensure the safety of the fuel cell. Summary of the Invention

[0005] The main technical problem solved by the present invention is to provide a fuel cell stack scavenging system that can effectively identify whether the scavenging pipeline is blocked and quickly remove hydrogen in the shell to improve safety. At the same time, a scavenging control method, computer equipment and storage medium using the fuel cell stack scavenging system are provided.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A fuel cell stack scavenging system, comprising:

[0008] A casing and a battery stack installed in the casing;

[0009] an air system connected to the cathode inlet of the fuel cell stack and used to provide oxygen to the fuel cell stack;

[0010] a tail exhaust system connected to the cathode outlet of the fuel cell stack and used to discharge the tail gas generated by the fuel cell stack;

[0011] A purge air pipeline is connected to the shell, the air system and the tail exhaust system respectively, and is used to divert the gas in the air system to purge the interior of the shell and discharge the gas through the tail exhaust system;

[0012] an emergency system connected to the tail exhaust system for emergency discharge of high-concentration hydrogen in the shell;

[0013] The gas storage and humidification device is connected to the emergency system and the air system respectively, and is used to store the high-concentration hydrogen discharged by the emergency system and supply humidified oxygen to the air system.

[0014] Furthermore, the emergency system includes:

[0015] a hydrogen concentration sensor, mounted on the inner wall of the housing, for detecting the concentration of hydrogen inside the housing;

[0016] a vacuum generating pump, mounted on the outer surface of the shell, for extracting high-concentration hydrogen gas from the shell;

[0017] The discharge valve is connected between the vacuum generating pump and the tail exhaust system, and is used to control the high-concentration hydrogen extracted by the vacuum generating pump to be discharged to the tail exhaust system.

[0018] Furthermore, the gas storage and humidification device includes:

[0019] A box body, wherein water is accumulated at the bottom of the box body;

[0020] a partition, one end of which is connected to the top inner wall of the box body and the other end of which is inserted into the accumulated water, wherein the partition separates the box body into an air inlet and an air outlet, and the volume of the air inlet is smaller than that of the air outlet;

[0021] An air inlet is provided on one side of the box body, one end of the air inlet is connected to the air inlet portion, and the other end is connected to the emergency system;

[0022] An exhaust port is provided on the other side of the box body, one end of the exhaust port is connected to the accumulated water, and the other end is connected to the outside atmosphere;

[0023] Two air outlets are arranged in parallel on the top of the box body, one of which is connected to the air system, and the other is connected to the hydrogen circulation system.

[0024] Furthermore, the gas storage and humidification device further comprises:

[0025] The L-shaped notch is located in the accumulated water, with one end connected to the exhaust port and the other end connected to the air outlet;

[0026] The bottom layer gas in the gas outlet portion enters the exhaust port along the L-shaped notch.

[0027] Furthermore, the air system includes:

[0028] an air compressor connected to the cathode inlet of the fuel cell stack;

[0029] An inlet valve is provided between the stack inlet and the air compressor, and is used to control the air entering the stack cathode;

[0030] The bypass valve is connected between the air compressor and the tail exhaust system, and is used to divert air and dilute the tail gas in the tail exhaust system.

[0031] Furthermore, the tail exhaust system includes:

[0032] a back pressure valve connected to the cathode outlet of the stack and used to control the pressure of the cathode of the stack;

[0033] The tail exhaust pipeline is connected to the back pressure valve, the bypass valve, the scavenging pipeline and the emergency system respectively, and is used to discharge the tail gas generated by the fuel cell.

[0034] Furthermore, the scavenging air pipeline includes:

[0035] an inlet pipeline, connected to the housing and the air inlet end of the inlet valve respectively;

[0036] An outlet pipeline is connected to the shell and the air outlet end of the back pressure valve respectively;

[0037] a scavenging valve, provided in the inlet pipeline, for controlling the air in the inlet pipeline to enter the housing;

[0038] A one-way valve is provided in the outlet pipe to prevent the exhaust gas in the tail exhaust pipe from flowing back into the shell.

[0039] Furthermore, the scavenging system further comprises:

[0040] Data module, used to obtain and record various parameters of the air system, scavenging pipeline, emergency system and gas storage and humidification device in real time;

[0041] A judgment module, used for receiving a signal from the data module and judging the blockage condition of the scavenging pipeline according to the received signal;

[0042] The regulating module is used to receive the signal from the judging module and regulate the air system, the scavenging pipeline, the emergency system and the air storage and humidifying device according to the received signal.

[0043] The second technical solution adopted in the present invention is:

[0044] A fuel cell stack scavenging control method, applied to the scavenging system as described above, comprises the following steps:

[0045] Get the working status of the vehicle;

[0046] Among them, the working state includes driving state and shutdown state;

[0047] If the vehicle is in motion, the blockage of the scavenging pipe is determined based on the hydrogen concentration between the fuel cell stack and the casing;

[0048] If the vehicle is in a stopped state, the blockage of the scavenging pipeline can be judged based on the idling time of the air compressor.

[0049] Furthermore, judging the blockage of the purge air line based on the hydrogen concentration between the fuel cell stack and the shell includes the following judging steps:

[0050] Set hydrogen concentration threshold and time threshold;

[0051] Obtain the hydrogen concentration between the fuel cell stack and the shell in real time;

[0052] When the ratio of the hydrogen concentration in the shell to the hydrogen concentration threshold reaches a set ratio, the purge valve in the purge pipeline is closed and the duration for the hydrogen concentration in the shell to increase to the hydrogen concentration threshold is recorded;

[0053] If the duration is greater than a preset time threshold, it is determined that the scavenging pipeline is blocked.

[0054] Furthermore, when the scavenging air pipeline is blocked while the vehicle is in motion, the following control steps are included:

[0055] Keep the scavenging valve closed, reduce the air flow of the air compressor and / or increase the opening of the bypass valve in the air system;

[0056] Start the vacuum generator and open the discharge valve to extract the high-concentration hydrogen in the shell to the tail exhaust pipe;

[0057] Alternatively, the discharge valve is closed and the gas storage and humidification device is opened to extract the high-concentration hydrogen in the shell to the gas storage and humidification device.

[0058] Furthermore, judging the blockage of the scavenging air pipeline according to the idling time of the air compressor includes the following judging steps:

[0059] Get the idling time of the air compressor in normal shutdown state;

[0060] When the vehicle is in a stopped state, keep the scavenging valve in the scavenging pipeline open, cut off the power supply of the air compressor, and record the time from the moment the power is cut off to the moment the air compressor speed reaches 0, which is recorded as the downtime;

[0061] If the downtime is shorter than the idling time, it is determined that the scavenging pipeline is blocked.

[0062] Furthermore, obtaining the idling time of the air compressor in a normal shutdown state includes the following steps:

[0063] Open the bypass valve and scavenging valve in the air system, close the inlet valve of the air system and the back pressure valve of the tail exhaust system, and keep the air compressor connected to the power supply. At this time, the air compressor is in the idling state;

[0064] Disconnect the power supply of the air compressor, close the bypass valve, and record the time from the moment the bypass valve is closed to the moment the air compressor speed reaches 0, which is recorded as the idling time.

[0065] Furthermore, when the scavenging air pipeline is blocked when the vehicle is stopped, the following control steps are included:

[0066] Set the on-off interval period and exhaust duration;

[0067] The vacuum generating pump and the gas storage and humidification device are electrically connected to the power battery according to the connection interval cycle and the exhaust time, and the hydrogen in the shell is stored in the gas storage and humidification device.

[0068] The third technical solution adopted in the present invention is:

[0069] A computer device comprising: a memory and a processor;

[0070] The memory is used to store at least one program;

[0071] When the program is executed by a processor, the processor implements the control method described above.

[0072] The fourth technical solution adopted by the present invention is:

[0073] A storage medium includes a computer program, which implements the control method described above when executed by a processor.

[0074] In summary, the fuel cell stack scavenging system, control method, computer device, and storage medium provided by the present invention have the following advantages over the prior art:

[0075] (1) The present invention connects the air system and the tail exhaust system respectively through the scavenging pipeline, thereby achieving the purpose of purging the internal space of the shell, ensuring that the hydrogen concentration in the shell is not too high, and avoiding explosion of the fuel cell stack.

[0076] (2) The present invention provides an emergency system to ensure that even if the purge pipe is blocked, the hydrogen in the shell can still be quickly discharged, thereby reducing safety hazards and improving safety.

[0077] (3) The present invention provides a gas storage and humidification device to ensure that the vehicle can still run normally in spaces with slow air flow, such as tunnels or parking lots. The hydrogen in the shell will not be discharged to the outside, thus avoiding the accumulation of hydrogen in the outside and reducing safety hazards.

[0078] (4) In the present invention, since the gas storage and humidification device can humidify the stored gas, the gas humidified by the gas storage and humidification device can directly enter the fuel cell stack without passing through the humidifier, thereby reducing the burden on the humidifier.

[0079] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0081] In the attached figure:

[0082] Figure 1 Schematic diagram of the overall structure of the scavenging system of the present invention;

[0083] Figure 2 2. It is a schematic structural diagram of the emergency system in the scavenging system of the present invention;

[0084] Figure 3 It is a structural schematic diagram of the scavenging pipeline of the present invention;

[0085] Figure 4 This is a structural diagram of the connection between the gas storage and humidification device and the hydrogen circulation system in one embodiment of the present invention;

[0086] Figure 5 It is a structural schematic diagram of the gas storage and humidification device of the present invention;

[0087] Figure 6 This is a structural diagram of the connection between the gas storage and humidification device and the tail exhaust pipeline in one embodiment of the present invention;

[0088] Figure 7 It is a schematic diagram of a module of the scavenging system of the present invention;

[0089] Figure 8 is a flow chart of a control method of the present invention applied to a scavenging system;

[0090] Figure 9 This is a schematic diagram of a process for determining the blockage of the purge gas pipeline based on the hydrogen concentration between the fuel cell stack and the housing according to the present invention;

[0091] Figure 10 This is a flow chart of the present invention for determining the blockage of the scavenging air pipeline according to the idling time of the air compressor;

[0092] Figure 11 This is a flow chart of diagnosing whether there is an air leak in an air system by utilizing the idling process of an air compressor in one embodiment of the present invention;

[0093] Figure 12 It is a structural diagram of the computer device and storage medium in the present invention.

[0094] In the figure: housing 10, fuel cell stack 20, air system 30, tail exhaust system 40, scavenging pipeline 50, emergency system 60, gas storage and humidification device 70, hydrogen circulation system 80;

[0095] Air compressor 31, inlet valve 32, bypass valve 33, back pressure valve 41, tail exhaust pipe 42, inlet pipe 51, outlet pipe 52, scavenging valve 53, one-way valve 54, hydrogen concentration sensor 61, vacuum pump 62, discharge valve 63, box body 71, partition 72, air inlet part 721, air outlet part 722, air inlet 73, exhaust port 74, air outlet 75, L-shaped notch 76, air-water separator 81.

[0096] It should be noted that the drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0097] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0098] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0099] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0100] like Figures 1 to 3As shown, the present invention provides a fuel cell stack scavenging system, including a shell 10 and a fuel cell stack 20. The fuel cell stack 20 is placed inside the shell 10. When the fuel cell is running, some hydrogen will leak out from the inside of the stack 20 and accumulate in the shell 10. Therefore, it is necessary to continuously purge the space between the stack 20 and the shell 10 to purge the hydrogen leaking from the stack 20, so as to reduce the concentration of hydrogen inside the shell 10 and ensure that the fuel cell can operate safely.

[0101] The fuel cell stack scavenging system of this embodiment includes an air system 30, a tail exhaust system 40, a scavenging pipeline 50, an emergency system 60 and a gas storage and humidification device 70. Among them, the air system 30 is connected to the cathode inlet of the fuel cell stack 20 for providing oxygen to the fuel cell stack 20. The tail exhaust system 40 is connected to the cathode outlet of the fuel cell stack 20 for discharging the tail gas generated by the fuel cell stack 20. The scavenging pipeline 50 is respectively connected to the shell 10, the air system 30 and the tail exhaust system 40. The scavenging pipeline 50 diverts the air in the air system 30 to purge the inside of the shell 10 and discharges the gas through the tail exhaust system 40. The emergency system 60 is connected to the tail exhaust system 40 for emergency discharge of high-concentration hydrogen in the shell 10. The gas storage and humidification device 70 is respectively connected to the emergency system 60 and the air system 30 for storing the high-concentration hydrogen discharged by the emergency system 60 and supplying humidified oxygen to the air system 30.

[0102] During normal driving of the vehicle, the air system 30 will continuously provide the oxygen required for the reaction to the cathode of the fuel cell stack 20. At the same time, the air system 30 will separate part of the air into the shell 10 through the scavenging pipe 50, thereby purging the shell 10. The hydrogen in the shell 10 (leaking from the anode of the fuel cell stack 20) ​​will be blown out from the other end of the shell 10 under the action of the air purge, and the blown gas will enter the tail exhaust system 40 for mixed and reduced concentration emission.

[0103] When the purge line 50 is blocked, air from the air system 30 cannot enter the housing 10 for purging, causing the hydrogen concentration in the housing 10 to rise, increasing the risk of explosion of the fuel cell stack 20 and posing a significant safety hazard. When the hydrogen concentration in the housing 10 rises to a certain concentration, opening the emergency system 60 can effectively discharge the hydrogen in the housing 10. Specifically, the emergency system 60 is normally closed. When the hydrogen concentration rises to a hydrogen concentration threshold or when the purge line 50 is diagnosed to be blocked, the emergency system 60 will be opened urgently, thereby quickly discharging the hydrogen in the housing 10 to the tail exhaust system 40, reducing safety hazards at the fuel cell stack 20.

[0104] When the scavenging pipe 50 of a vehicle is blocked in a space with slow air flow, such as a tunnel or an underground parking lot, if the emergency system 60 is used to discharge the hydrogen in the shell 10 to the outside, it will cause the accumulation of hydrogen in the outside, which can easily cause an explosion. Therefore, the hydrogen in the shell 10 cannot be discharged to the outside at will. At this time, the discharge valve 63 must be closed and the gas storage and humidification device 70 must be opened. The gas storage and humidification device 70 is connected to the emergency system 60 and can store the hydrogen in the emergency system 60 (the discharge valve 63 is closed at this time, and the hydrogen cannot be discharged through the tail exhaust system 40). After the vehicle leaves this place, the gas storage and humidification device 70 will classify and process the temporarily stored gas (the gas includes oxygen, hydrogen and nitrogen). For further explanation, as Figure 5 As shown, the inlet and outlet of the gas in the gas storage and humidification device 70 are all controlled by electromagnetic valves, that is, the air inlet 73, the air outlet 74 and the air outlet 75 of the gas storage and humidification device 70 are all controlled by corresponding electromagnetic valves. On the other hand, the gas storage and humidification device 70 is also connected to the air system 30 (as shown in FIG. Figure 1 As shown), the gas storage and humidification device 70 has a gas humidification function, which can humidify the stored gas (oxygen, hydrogen and nitrogen). The humidified oxygen will enter the air system 30 and then enter the cathode of the fuel cell stack 20 for reaction. It should be noted here that the air compressed and pressurized by the air compressor 31 needs to enter the humidifier before entering the cathode of the fuel cell stack 20, thereby increasing the humidity of the compressed air and avoiding the air entering the cathode of the fuel cell stack 20 being too dry, resulting in the membrane electrode being in a water-deficient state, which is not conducive to the electrochemical reaction on the membrane electrode (the membrane electrode is generally in a wet state). The gas moisturized by the gas storage and humidification device 70 can directly enter the fuel cell stack 20 without passing through the humidifier, thereby reducing the burden on the humidifier.

[0105] like Figure 4 As shown, in another embodiment of the present invention, the gas storage and humidification device 70 can also be connected to the gas-water separator 81 in the hydrogen circulation system. Specifically, the hydrogen circulation system is used to improve the utilization rate of hydrogen and can recycle the unreacted hydrogen in the fuel cell stack 20, thereby achieving the purpose of saving energy. Part of the hydrogen stored in the gas storage and humidification device 70 can be introduced into the hydrogen circulation system, thereby increasing the hydrogen content in the hydrogen circulation system and reducing the hydrogen supply pressure of the hydrogen supply system.

[0106] The present invention connects the air system 30 and the tail exhaust system 40 respectively through the scavenging pipe 50, thereby achieving the purpose of purging the internal space of the shell 10, ensuring that the hydrogen concentration in the shell 10 will not be too high, avoiding the explosion of the fuel cell stack 20, and setting up an emergency system 60 to ensure that the scavenging pipe 50 can still quickly discharge the hydrogen in the shell 10 when it is blocked, reducing safety hazards. By setting up a gas storage and humidification device 70, it is ensured that the vehicle can still drive normally in spaces with slow air flow such as tunnels or parking lots, and the hydrogen in the shell 10 will not be discharged to the outside, avoiding the accumulation of hydrogen in the outside, reducing safety hazards. At the same time, since the gas storage and humidification device 70 can moisten the stored gas, the gas moisturized by the gas storage and humidification device 70 can directly enter the fuel cell stack 20 without passing through the humidifier, thereby reducing the burden on the humidifier.

[0107] like Figure 1 and Figure 2 As shown in FIG. 1 , further explanation is provided, and the emergency system 60 includes a hydrogen concentration sensor 61, a vacuum pump 62, and a discharge valve 63. The hydrogen concentration sensor 61 is mounted on the inner wall of the housing 10 to detect the concentration of hydrogen inside the housing 10; the vacuum pump 62 is mounted on the outer surface of the housing 10 to extract high-concentration hydrogen from the housing 10; and the discharge valve 63 is connected between the vacuum pump 62 and the tail exhaust system 40 to control the discharge of high-concentration hydrogen extracted by the vacuum pump 62 to the tail exhaust system 40.

[0108] In this embodiment, the power of the hydrogen concentration sensor 61 and the vacuum generating pump 62 are both provided by the power battery, ensuring that the vacuum generating pump 62 can work periodically even when the vehicle is in a stopped state. The discharge valve 63 is in an open state when the scavenging pipe 50 operates normally. When the scavenging pipe 50 is blocked, the hydrogen in the shell 10 needs to be discharged in time. At this time, the vacuum generating pump 62 extracts the gas in the shell 10 and transports it to the tail exhaust system 40 through the discharge valve 63.

[0109] To further explain, when the vehicle is traveling in a space with slow air flow such as a tunnel or a parking lot and the scavenging line 50 is blocked, the discharge valve 63 will be in a closed state, ensuring that all the hydrogen extracted by the vacuum pump 62 enters the gas storage and humidification device 70, and ensuring that the hydrogen in the shell 10 will not be discharged into the outside air, thereby avoiding hydrogen accumulation and unnecessary safety hazards.

[0110] For further explanation, there is at least one vacuum pump 62, and at least one vacuum pump 62 is installed on the top of the shell 10. Since hydrogen is lighter than oxygen and nitrogen, when the purge line 50 is blocked and cannot purge the shell 10, the hydrogen, oxygen, and nitrogen in the shell 10 begin to accumulate. Since hydrogen is the lightest gas, it tends to accumulate in the upper layer of the space within the shell 10. Installing the vacuum pump 62 on the top of the shell 10 can quickly extract the high-concentration hydrogen accumulated in the shell 10 from the shell 10, ensuring the safety of the fuel cell stack 20.

[0111] like Figure 5 As shown, further explanation is given, the gas storage and humidification device 70 includes a box body 71 and a partition 72, and water is accumulated at the bottom of the box body 71. One end of the partition 72 is connected to the top inner wall of the box body 71, and the other end of the partition 72 is inserted into the accumulated water. The partition 72 separates the box body 71 into an air inlet portion 721 and an air outlet portion 722, and the volume of the air inlet portion 721 is smaller than the volume of the air outlet portion 722; an air inlet 73 is provided on one side of the box body 71, one end of the air inlet 73 is connected to the air inlet portion 721, and the other end of the air inlet 73 is connected to the emergency system 60; an exhaust port 74 is provided on the other side of the box body 71 opposite to the air inlet 73, one end of the exhaust port 74 is connected to the accumulated water, and the other end of the exhaust port 74 is connected to the outside atmosphere; two air outlets 75 are also provided in parallel on the top of the box body 71, one of the air outlets 75 is connected to the air system 30, and the other air outlet 75 is connected to the hydrogen circulation system.

[0112] In this embodiment, water is accumulated at the bottom of the box 71 to moisten the gas. A partition 72 is also provided within the box 71, with one end of the partition 72 inserted into the water. The partition 72 separates the box 71 into an air inlet 721 and an air outlet 722. The volume of the air inlet 721 is smaller than that of the air outlet 722 (to facilitate storage of more moistened gas). Due to the presence of the partition 72, the gas entering the box 71 must first enter the water and be moistened by the water before entering the air outlet 722. The presence of the partition 72 also protects the gas in the air outlet 722 from being disturbed by the gas in the air inlet 721 during stratification, facilitating the subsequent transport of the gas in the air outlet 722 to the air system 30 or the hydrogen circulation system through the outlet 75.

[0113] To further illustrate, the humidified gas will be stratified in the space of the gas outlet 722, wherein the upper layer is hydrogen and the lower layer is a mixed gas of oxygen and nitrogen (the mass fractions of the two are similar). As the gas from the air inlet 721 is continuously transported to the gas outlet 722, the nitrogen-oxygen mixed gas at the bottom of the gas outlet 722 will be gradually squeezed out of the gas storage and humidification device 70 through the exhaust port 74 (because hydrogen is at the top layer, there is no need to worry about leakage). When the vehicle leaves the tunnel or the parking lot, the gas outlet 75 connected to the hydrogen circulation system guides the hydrogen in the upper layer of the gas outlet 722 into the gas-water separator, increasing the hydrogen content in the hydrogen circulation system. Subsequently, the gas outlet 75 connected to the air system 30 is connected through the solenoid valve, and the humidified oxygen and nitrogen in the gas outlet 722 are reintroduced into the cathode of the fuel cell stack 20.

[0114] like Figure 5 As shown, further explanation is given, the gas storage and humidification device 70 also includes an L-shaped notch 76, which is located in the accumulated water, one end of which is connected to the exhaust port 74, and the other end is connected to the air outlet 722. The gas close to the accumulated water in the air outlet 722 enters the exhaust port 74 along the L-shaped notch 76.

[0115] The setting of the above-mentioned L-shaped notch 76 can increase the pressure at the notch, so that the oxygen and nitrogen at the bottom of the air outlet 722 can be quickly discharged under the squeeze of hydrogen (the discharge of nitrogen and oxygen will not cause the risk of explosion, and the storage capacity of hydrogen can be increased by squeezing out nitrogen and oxygen). At the same time, the setting of the L-shaped notch 76 can effectively prevent hydrogen from bypassing the accumulated water and being discharged directly from the exhaust port 74.

[0116] like Figure 1 As shown, further explanation is given, the air system 30 includes an air compressor 31, which is connected to the cathode inlet of the fuel cell stack 20, and an inlet valve 32 is set between the inlet of the fuel cell stack 20 and the air compressor 31 for controlling the air entering the cathode of the fuel cell stack 20, and a bypass valve 33 is connected between the air compressor 31 and the tail exhaust system 40 for diverting air and diluting the exhaust gas in the tail exhaust system 40.

[0117] Among them, the air compressor 31 can compress and pressurize the air. Part of the air compressed and pressurized by the air compressor 31 enters the cathode of the fuel cell stack 20 to participate in the reaction (oxygen participates in the reaction), part of it enters the purge pipe 50 and purges the shell 10, and part of the air flows into the tail exhaust system 40 through the bypass valve 33 to dilute the exhaust gas in the tail exhaust system 40 to ensure that the hydrogen concentration in the tail exhaust gas does not exceed the standard.

[0118] like Figure 1 and Figure 6As shown, it is further explained that the tail exhaust system 40 includes a back pressure valve 41 and a tail exhaust pipeline 42. The back pressure valve 41 is connected to the cathode outlet of the fuel cell stack 20 and is used to control the pressure of the cathode of the fuel cell stack 20; the tail exhaust pipeline 42 is respectively connected to the back pressure valve 41, the bypass valve 33, the scavenging pipeline 50 and the emergency system 60, and is used to discharge the exhaust generated by the fuel cell.

[0119] like Figure 6 As shown, in another embodiment of the present invention, the tail exhaust pipe 42 is also connected to the exhaust port 74 of the gas storage and humidification device 70, and a hydrogen concentration sensor 61 is installed on the tail exhaust pipe 42. When it is detected that the hydrogen concentration in the tail exhaust pipe 42 exceeds the standard, the tail gas in the tail exhaust pipe 42 will be passed into the gas storage and humidification device 70 for storage, and at the same time, the opening of the bypass valve 33 will be increased to allow more air to enter the tail exhaust pipe 42, thereby playing a role in diluting the hydrogen in the tail gas.

[0120] like Figure 1 and Figure 3 As shown, further explanation is given, the scavenging pipeline 50 includes an inlet pipeline 51 and an outlet pipeline 52, the inlet pipeline 51 is respectively connected to the shell 10 and the air inlet end of the inlet valve 32; the outlet pipeline 52 is respectively connected to the shell 10 and the air outlet end of the back pressure valve 41; a scavenging valve 53 is provided on the inlet pipeline 51, and the scavenging valve 53 is used to control the air in the inlet pipeline 51 to enter the shell 10; a one-way valve 54 is provided on the outlet pipeline 52, and the one-way valve 54 is used to prevent the exhaust gas in the tail exhaust pipeline 42 from flowing back into the shell 10.

[0121] like Figure 7 As shown, it is further explained that the scavenging system also includes a data module, a judgment module and an adjustment module.

[0122] The data module is used to acquire and record various parameters of the air system 30, scavenging pipeline 50, emergency system 60, and air storage and humidification device 70 in real time. Specifically, these parameters include the flow rate of the air compressor 31 in the air system 30, the opening of the inlet valve 32, the opening of the bypass valve 33, the opening of the scavenging valve 53 in the scavenging pipeline 50, the hydrogen concentration measured by the hydrogen concentration sensor 61 in the emergency system 60, the power of the vacuum pump 62, the opening of the discharge valve 63, and the opening of the solenoid valves that control the air inlet and outlet of the air storage and humidification device 70. The data module also includes various preset thresholds, such as hydrogen concentration thresholds and time thresholds.

[0123] The judgment module is used to receive signals from the data module and judge the blockage condition of the scavenging pipeline 50 based on the received signals; for example, the judgment module can judge whether the scavenging pipeline 50 is blocked in the driving state by receiving the hydrogen concentration signal measured by the hydrogen concentration sensor 61 and combining the hydrogen concentration threshold and the time threshold; and can judge whether the scavenging pipeline 50 is blocked in the shutdown state by receiving the idling time signal and the shutdown time signal of the air compressor 31.

[0124] The regulating module is used to receive the signal from the judging module and regulate the air system 30 , the scavenging air pipeline 50 , the emergency system 60 and the air storage and humidifying device 70 according to the received signal.

[0125] Each module in the above-mentioned control system (data module, judgment module and adjustment module) can be embedded in or independent of the processor of the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0126] like Figure 8 As shown, a fuel cell stack 20 scavenging control method is applied to the above-mentioned scavenging system, comprising the following steps:

[0127] Obtain the working status of the vehicle, which can be determined by the real-time vehicle speed.

[0128] Among them, the working state includes the driving state and the shutdown state (i.e. the idling state, when the vehicle speed is 0); if the vehicle is in the driving state, the blockage condition of the scavenging pipe 50 is judged according to the hydrogen concentration between the fuel cell stack 20 and the shell 10.

[0129] Specifically, such as Figure 9 As shown, judging the blockage of the purge pipe 50 based on the hydrogen concentration between the fuel cell stack 20 and the housing 10 includes the following judging steps:

[0130] Set the hydrogen concentration threshold and time threshold; the hydrogen concentration threshold is 25% LFL, and the time threshold is 30s-60s;

[0131] Real-time acquisition of hydrogen concentration between the fuel cell stack 20 and the housing 10;

[0132] When the ratio of the hydrogen concentration in the housing 10 to the hydrogen concentration threshold reaches a set ratio, which is preferably 60%, that is, when the hydrogen concentration in the housing 10 is equal to 60% of the hydrogen concentration threshold, the purge valve 53 is closed and the duration for the hydrogen concentration in the housing 10 to increase to the hydrogen concentration threshold is recorded;

[0133] If the duration is greater than or equal to a preset time threshold, it is determined that the scavenging pipeline 50 is blocked; if the duration is less than the preset time threshold, it is determined that the anode of the fuel cell stack 20 is leaking.

[0134] To further illustrate, the increase in hydrogen concentration in the housing 10 is primarily due to two factors. One is the blockage of the purge line 50, which prevents air from the air compressor 31 from entering the housing 10 and, therefore, from purging the hydrogen in the housing 10. This causes hydrogen to accumulate in the housing 10, causing the hydrogen concentration to continue to rise. Another possible cause of the increase in hydrogen concentration in the housing 10 is leakage at the anode of the stack 20, which causes hydrogen at the anode of the stack 20 to continuously diffuse outward into the housing 10, leading to an increase in the hydrogen concentration in the housing 10. This embodiment uses a hydrogen concentration sensor 61 to monitor the hydrogen concentration in the housing 10 in real time, enabling timely detection of abnormalities in the housing 10. Under normal circumstances, due to changes in vehicle driving power, the hydrogen content leaking from the fuel cell stack 20 and the air flow from the air compressor 31 will change, resulting in a certain degree of fluctuation in the hydrogen concentration within the housing 10. Within the allowable range, the hydrogen concentration sensor 61 will not issue an abnormal alarm. When the hydrogen concentration within the housing 10 reaches the hydrogen concentration threshold of 60%, it indicates that the hydrogen concentration within the housing 10 is abnormal, and the cause of the increase in the hydrogen concentration within the housing 10 needs to be determined. This embodiment closes the purge valve 53 and simultaneously records the duration of the hydrogen concentration within the housing 10 increasing to the hydrogen concentration threshold when the purge valve 53 is closed. By comparing this duration with the time threshold, the specific cause of the increase in the hydrogen concentration within the housing 10 can be determined. Specifically, if the duration is greater than or equal to the preset time threshold, it means that the growth rate of the hydrogen concentration in the shell 10 is relatively slow, and the increase in hydrogen concentration is mainly due to the continuous leakage of hydrogen from the anode of the fuel cell stack 20. Since the scavenging pipe 50 is blocked, the fuel cell stack 20 in the driving state will continuously leak hydrogen, so the hydrogen concentration in the shell 10 rises. If the duration is less than the preset time threshold, it means that the hydrogen concentration in the shell 10 rises at a faster rate, and the increase in hydrogen mainly comes from the leakage of the anode of the fuel cell stack 20. Due to the leakage of the anode of the fuel cell stack 20, a large amount of hydrogen leaks from the anode of the fuel cell stack 20 into the shell 10, causing the hydrogen concentration in the shell 10 to surge, and exhaust treatment is required in time.

[0135] To further illustrate this embodiment, when the scavenging air pipe 50 is blocked while the vehicle is in motion, the following control steps are included:

[0136] Keep the scavenging valve 53 closed, reduce the air flow of the air compressor 31 and / or increase the opening of the bypass valve 33;

[0137] Start the vacuum generator and open the discharge valve 63 to extract the high-concentration hydrogen in the shell 10 to the tail exhaust pipe 42, or;

[0138] The discharge valve 63 is closed and the gas storage and humidification device 70 is opened to extract the high-concentration hydrogen in the shell 10 into the gas storage and humidification device 70 .

[0139] Specifically, due to the blockage of the scavenging line 50, more air flow from the air compressor 31 will flow to the cathode of the fuel cell stack 20, causing the reaction at the cathode of the fuel cell stack 20 to intensify. More hydrogen will seep out from the anode of the fuel cell stack 20 and diffuse into the housing 10, causing the hydrogen concentration in the housing 10 to increase rapidly. This embodiment reduces the air flow of the air compressor 31, thereby reducing the air entering the cathode of the fuel cell stack 20, reducing the reaction rate on the membrane electrode of the fuel cell stack 20, and slowing the rate of increase of the hydrogen concentration in the housing 10. This allows the emergency system 60 more time to extract the hydrogen from the housing 10, ensuring the safety of the fuel cell stack 20.

[0140] In another embodiment, the purpose of reducing the air flow entering the cathode of the fuel cell stack 20 can be achieved by increasing the opening of the bypass valve 33, which can also serve the purpose of slowing down the rate of increase of the hydrogen concentration in the shell 10. In order to further ensure the safety of the fuel cell stack 20 (without considering the performance of the fuel cell stack 20), the opening of the bypass valve 33 can be increased while lowering the air flow of the air compressor 31, so as to slow down the rate of increase of the hydrogen concentration in the shell 10 to the greatest extent and ensure the safety of the fuel cell stack 20.

[0141] When it is determined that the purge pipe 50 is blocked, the hydrogen in the shell 10 needs to be discharged. At this time, it is necessary to start the vacuum generating pump 62 and open the discharge valve 63 to pump the hydrogen in the shell 10 into the tail exhaust pipe 42, and then discharge it to the external environment after being diluted by the tail gas.

[0142] Further explanation, if the vehicle is in an environment with slow air flow such as a tunnel or a parking lot, the hydrogen extracted by the vacuum pump 62 cannot be directly discharged to the outside through the tail exhaust pipe 42 (it is easy to exceed the hydrogen emission standard value in a closed environment). At this time, the discharge valve 63 should be closed, and the gas storage and humidification device 70 should be opened to continuously extract the hydrogen in the shell 10 into the gas storage and humidification device 70 for storage, and then discharged or recycled after the vehicle leaves the current environment (hydrogen is introduced into the gas-water separator, and oxygen and nitrogen are introduced into the cathode of the fuel cell stack 20).

[0143] If the vehicle is in a stopped state, the blockage of the scavenging pipeline 50 can be determined based on the idling time of the air compressor 31. Figure 10 As shown, judging the blockage of the scavenging pipeline 50 according to the idling time of the air compressor 31 includes the following judging steps:

[0144] Obtain the idling time of the air compressor 31 in a normal shutdown state;

[0145] When the vehicle is in a stopped state, keep the scavenging valve 53 open, cut off the power supply of the air compressor 31, and record the time from the moment the power is cut off to the moment the speed of the air compressor 31 reaches 0, which is recorded as the downtime;

[0146] If the shutdown time is shorter than the idling time, it is determined that the scavenging pipeline 50 is blocked.

[0147] In this embodiment, the idling time is the time it takes for the speed of the air compressor 31 to become 0 after it is normally powered off and shut down when the scavenging pipeline 50 is not blocked. In order to ensure that the vehicle can be safely started next time after being shut down, the data module will record the downtime of each time the air compressor 31 is powered off, and judge the blockage condition of the scavenging pipeline 50 based on the downtime.

[0148] Specifically, when the shutdown time is less than the idling time, it indicates that the scavenging pipe 50 is blocked. Further explanation is that when the vehicle is in a shutdown state, the inlet valve 32 and the bypass valve 33 are both in a closed state. At this time, only the air compressor 31, the scavenging pipe 50 and the tail exhaust pipe 42 are connected (the idling of the air compressor 31 is used to continuously purge the shell 10). If the scavenging pipe 50 is not blocked, the time for the speed of the air compressor 31 to become 0 is equivalent to the idling time. If the scavenging pipe 50 is blocked, the air compressor 31 will experience a pump-blocking phenomenon, and the gas resistance will cause the speed of the air compressor 31 to drop rapidly, shortening the idling time of the air compressor 31, thereby causing the shutdown time to be much less than the idling time. Therefore, when the shutdown time is less than the idling time (the decrease is not less than 30%), it can be determined that the scavenging pipe 50 is blocked.

[0149] It should be noted that, during the idling phase, the pump holding phenomenon will not cause damage to the air compressor 31 .

[0150] To further illustrate, obtaining the idling time of the air compressor 31 in a normal shutdown state includes the following steps:

[0151] Open the bypass valve 33 and the scavenging valve 53, close the inlet valve 32 and the back pressure valve 41, and keep the air compressor 31 powered on. At this time, the air compressor 31 is in an idling state (the speed is generally 20,000 rpm-40,000 rpm);

[0152] The power supply of the air compressor 31 is disconnected, the bypass valve 33 is closed, and the time from the moment the bypass valve 33 is closed to the moment the speed of the air compressor 31 reaches 0 is recorded as the idling time.

[0153] Further explanation, when the scavenging air pipeline 50 is blocked when the vehicle is stopped, the following control steps are included:

[0154] Set the connection interval and exhaust time, wherein preferably, the connection interval is 1h-1.5h, the exhaust time is 5min, and the connection times are not less than twice;

[0155] The vacuum generating pump 62 and the gas storage and humidification device 70 are electrically connected to the power battery according to the on-off interval period and the exhaust time, and the hydrogen in the housing 10 is stored in the gas storage and humidification device 70 .

[0156] Specifically, when the scavenging line 50 of the vehicle is blocked when the vehicle is stopped, since the air cannot purge the shell 10, some hydrogen will still leak out of the fuel cell stack 20 and accumulate in the shell 10 when the vehicle is stopped. In order to ensure the safety of the next driving, the gas in the shell 10 needs to be extracted regularly. In this embodiment, the vacuum generating pump 62 and the gas storage and humidification device 70 are regularly connected to the power battery in the vehicle by setting the connection interval period and the exhaust time, so that the hydrogen accumulated in the shell 10 can be discharged into the gas storage and humidification device 70, thereby ensuring the safety of the fuel cell stack 20 and ensuring that the hydrogen discharged from the shell 10 will not be discharged into the external environment (such as relatively closed spaces such as indoor parking lots).

[0157] like Figure 11 As shown, in another embodiment of the present invention, the idling process of the air compressor 31 can also be used to diagnose whether there is an air leak in the air system 30 (in this case, the scavenging pipeline 50 is normal and not blocked). The specific diagnostic steps are as follows:

[0158] When the vehicle is in a stopped state, the scavenging valve 53 and the back pressure valve 41 are closed, and the bypass valve 33 is kept open;

[0159] Disconnect the power supply of the air compressor 31 and close the bypass valve 33. The air compressor 31 enters the idling state. When the speed of the air compressor 31 reaches 0, obtain the air flow reading at the inlet of the air compressor 31.

[0160] If the air flow reading at the inlet of the air compressor 31 is not 0, it is determined that a leak has occurred in the air system 30;

[0161] If the air flow reading at the inlet of the air compressor 31 is 0, the air flow from the moment the air compressor 31 is powered off to the moment the speed of the air compressor 31 is 0 is integrated to obtain the total air volume during the idling process;

[0162] The obtained total air volume is compared with a preset volume. If the obtained air volume is greater than the preset volume, it is determined that there is a leak in the air system 30 .

[0163] Specifically, when the vehicle is stopped, the scavenging valve 53 and the back-pressure valve 41 are closed, the back-pressure valve 41 is kept open, the power to the air compressor 31 is disconnected, and the bypass valve 33 is closed. Due to inertia, the air compressor 31 is in an idling state. Under normal circumstances, the air flow rate at the inlet of the air compressor 31 will drop to 0. If the air system 30 is leaking, air flow will continue to flow at the inlet of the air compressor 31, and the reading will not be 0. If the leakage is very small, the inlet flow rate reading may still be 0. In this case, further diagnosis of the air system 30 is required. Specifically, the air flow rate from the moment the air compressor 31 is powered off to the moment the air compressor 31 speed reaches 0 is integrated to calculate the total air volume during the above period (during idling). The calculated air volume is compared with a preset volume (5L-15L). If the calculated air volume is less than or equal to the preset volume, it indicates that there is no leakage in the air system 30. If the calculated air volume is greater than the preset volume, it indicates that there is a leakage in the air system 30 and it needs to be repaired.

[0164] like Figure 12 As shown, another embodiment of the present invention further provides a computer device, including a memory and a processor; the memory is used to store at least one program; when the program is executed by the processor, the processor implements the control method in the above embodiment.

[0165] Specifically, the computer device internally includes a bus and a processor, memory, and network interface connected to the bus. The processor provides computing and control capabilities; the memory includes storage media (which stores an operating system, computer programs, and databases) and internal memory (which provides an environment for the operating system and computer programs); and the network interface is used to connect and communicate with external terminals.

[0166] This embodiment further provides a storage medium including a computer program, which implements the control method in the above embodiment when executed by a processor.

[0167] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A fuel cell stack scavenging system, characterized in that: include: A casing and a battery stack installed in the casing; an air system connected to the cathode inlet of the fuel cell stack and used to provide oxygen to the fuel cell stack; a tail exhaust system connected to the cathode outlet of the fuel cell stack and used to discharge the tail gas generated by the fuel cell stack; A purge air pipeline is connected to the shell, the air system and the tail exhaust system respectively, and is used to divert the gas in the air system to purge the interior of the shell and discharge the gas through the tail exhaust system; an emergency system connected to the tail exhaust system for emergency discharge of high-concentration hydrogen in the shell; The gas storage and humidification device is connected to the emergency system and the air system respectively, and is used to store the high-concentration hydrogen discharged by the emergency system and supply humidified oxygen to the air system.

2. A fuel cell stack scavenging system according to claim 1, characterized in that: The emergency system includes: a hydrogen concentration sensor, mounted on the inner wall of the housing, for detecting the concentration of hydrogen inside the housing; a vacuum generating pump, mounted on the outer surface of the shell, for extracting high-concentration hydrogen gas from the shell; The discharge valve is connected between the vacuum generating pump and the tail exhaust system, and is used to control the high-concentration hydrogen extracted by the vacuum generating pump to be discharged to the tail exhaust system.

3. A fuel cell stack scavenging system according to claim 1, characterized in that: The gas storage and humidification device comprises: A box body, wherein water is accumulated at the bottom of the box body; a partition, one end of which is connected to the top inner wall of the box body and the other end of which is inserted into the accumulated water, wherein the partition separates the box body into an air inlet and an air outlet, and the volume of the air inlet is smaller than that of the air outlet; An air inlet is provided on one side of the box body, one end of the air inlet is connected to the air inlet portion, and the other end is connected to the emergency system; An exhaust port is provided on the other side of the box body, one end of the exhaust port is connected to the accumulated water, and the other end is connected to the outside atmosphere; Two air outlets are arranged in parallel on the top of the box body, one of which is connected to the air system, and the other is connected to the hydrogen circulation system.

4. A fuel cell stack scavenging system according to claim 3, characterized in that: The gas storage and humidification device also includes: The L-shaped notch is located in the accumulated water, with one end connected to the exhaust port and the other end connected to the air outlet; The bottom layer gas in the gas outlet portion enters the exhaust port along the L-shaped notch.

5. A fuel cell stack scavenging system according to claim 1, characterized in that: The air system includes: an air compressor connected to the cathode inlet of the fuel cell stack; An inlet valve is provided between the stack inlet and the air compressor, and is used to control the air entering the stack cathode; The bypass valve is connected between the air compressor and the tail exhaust system, and is used to divert air and dilute the tail gas in the tail exhaust system.

6. A fuel cell stack scavenging system according to claim 5, characterized in that: The tail exhaust system includes: a back pressure valve connected to the cathode outlet of the stack and used to control the pressure of the cathode of the stack; The tail exhaust pipeline is connected to the back pressure valve, the bypass valve, the scavenging pipeline and the emergency system respectively, and is used to discharge the tail gas generated by the fuel cell.

7. A fuel cell stack scavenging system according to claim 6, characterized in that: The scavenging air pipeline comprises: an inlet pipeline, connected to the housing and the air inlet end of the inlet valve respectively; An outlet pipeline is connected to the shell and the air outlet end of the back pressure valve respectively; a scavenging valve, provided in the inlet pipeline, for controlling the air in the inlet pipeline to enter the housing; A one-way valve is provided in the outlet pipe to prevent the exhaust gas in the tail exhaust pipe from flowing back into the shell.

8. A fuel cell stack scavenging system according to claim 1, characterized in that: The scavenging system further comprises: Data module, used to obtain and record various parameters of the air system, scavenging pipeline, emergency system and gas storage and humidification device in real time; A judgment module, used for receiving a signal from the data module and judging the blockage condition of the scavenging pipeline according to the received signal; The regulating module is used to receive the signal from the judging module and regulate the air system, the scavenging pipeline, the emergency system and the air storage and humidifying device according to the received signal.

9. A fuel cell stack scavenging control method, applied to the scavenging system according to any one of claims 1 to 8, characterized in that: The steps include: Get the working status of the vehicle; Among them, the working state includes driving state and shutdown state; If the vehicle is in motion, the blockage of the scavenging pipe is determined based on the hydrogen concentration between the fuel cell stack and the casing; If the vehicle is in a stopped state, the blockage of the scavenging pipeline can be judged based on the idling time of the air compressor.

10. A fuel cell stack scavenging control method according to claim 9, characterized in that: The following steps are used to determine the blockage of the purge gas line based on the hydrogen concentration between the fuel cell stack and the shell: Set hydrogen concentration threshold and time threshold; Obtain the hydrogen concentration between the fuel cell stack and the shell in real time; When the ratio of the hydrogen concentration in the shell to the hydrogen concentration threshold reaches a set ratio, the purge valve in the purge pipeline is closed and the duration for the hydrogen concentration in the shell to increase to the hydrogen concentration threshold is recorded; If the duration is greater than a preset time threshold, it is determined that the scavenging pipeline is blocked.

11. A fuel cell stack scavenging control method according to claim 10, characterized in that: When the scavenging air pipe is blocked while the vehicle is in motion, the following control steps are included: Keep the scavenging valve closed, reduce the air flow of the air compressor and / or increase the opening of the bypass valve in the air system; Start the vacuum generator and open the discharge valve to extract the high-concentration hydrogen in the shell to the tail exhaust pipe; Alternatively, the discharge valve is closed and the gas storage and humidification device is opened to extract the high-concentration hydrogen in the shell to the gas storage and humidification device.

12. A fuel cell stack scavenging control method according to claim 9, characterized in that: The following steps are used to determine the blockage of the scavenging air line based on the idling time of the air compressor: Get the idling time of the air compressor in normal shutdown state; When the vehicle is in a stopped state, keep the scavenging valve in the scavenging pipeline open, cut off the power supply of the air compressor, and record the time from the moment the air compressor is powered off to the moment the air compressor speed reaches 0, which is recorded as the downtime; If the downtime is shorter than the idling time, it is determined that the scavenging pipeline is blocked.

13. A fuel cell stack scavenging control method according to claim 12, characterized in that: Obtaining the idling time of the air compressor in a normal shutdown state includes the following steps: Open the bypass valve and scavenging valve in the air system, close the inlet valve of the air system and the back pressure valve of the tail exhaust system, and keep the air compressor connected to the power supply. At this time, the air compressor is in the idling state; Disconnect the power supply of the air compressor, close the bypass valve, and record the time from the moment the bypass valve is closed to the moment the air compressor speed reaches 0, which is recorded as the idling time.

14. A fuel cell stack scavenging control method according to claim 12, characterized in that: When the scavenging air line is blocked when the vehicle is stopped, the following control steps are included: Set the on-off interval period and exhaust duration; The vacuum generating pump and the gas storage and humidification device are electrically connected to the power battery according to the connection interval cycle and the exhaust time, and the hydrogen in the shell is stored in the gas storage and humidification device.

15. A computer device, characterized in that: include: memory and processor; The memory is used to store at least one program; When the program is executed by a processor, the processor implements the control method according to any one of claims 9 to 14.

16. A storage medium comprising a computer program, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 9 to 14 is implemented.

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