Flow Control Method, System, Electronic Device and Storage Medium for Stack Test Bench

Abstract

The present application relates to a flow control method, system, electronic device and storage medium for a stack test bench. The method includes: obtaining a first temperature, a first pressure and a first humidity at the outlet of a humidifier; obtaining a second temperature, a second pressure and a second humidity at the inlet of a stack; obtaining the total dry gas flow rate of dry gas introduced into a dry gas path and a wet gas path; controlling a first flow rate of gas in the dry gas path and a second flow rate of gas in the wet gas path according to changes in the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity and the total dry gas flow rate; wherein the second flow rate is the total flow rate of dry gas and wet gas in the wet gas path. Since the gas flow path is shortened, when the working condition changes, the actual flow rate and pressure at the inlet of the stack can respond quickly, so that the gas supply is sufficient or meets the requirements of the working condition, and the stack test bench can meet the simulation ability requirements under all working conditions.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and particularly to a flow control method, system, electronic device and storage medium for a fuel cell stack test bench. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy. It is not restricted by the Carnot cycle effect and has high efficiency. In addition, the fuel cell uses fuel and oxygen as raw materials, and at the same time has no mechanical transmission components, emits less harmful gases, and has a long service life. Therefore, from the perspective of energy conservation and ecological environment protection, fuel cells are the most promising power generation technologies.

[0003] A fuel cell stack is the main place where electrochemical reactions occur and is the core component of a fuel cell system. A stack test bench can comprehensively test the working state, stability and safety of the fuel cell stack. When using a stack test bench to test a fuel cell stack, it is necessary to control the flow rate of the gas flowing into the fuel cell stack.

[0004] However, in traditional fuel cell stack test technologies, from the flow control point for controlling the gas flow rate to the back pressure valve section, it is necessary to flow through a humidifier, a heater and corresponding pipelines in sequence, and the flowing path is relatively long. When the working condition changes rapidly, the actual flow rate and pressure at the fuel cell stack inlet cannot respond quickly, and there will be a large lag, which may cause the fuel cell stack to be under-gassed or the gas supply to fail to meet the requirements of the working condition, resulting in the inability of the fuel cell stack test bench to meet the simulation ability requirements under all working conditions. Summary of the Invention

[0005] Based on this, in view of the problem that the traditional fuel cell stack test has a low response speed and cannot meet the simulation ability requirements under all working conditions, it is necessary to provide a fuel cell stack test bench flow control method, system, electronic device and storage medium that can improve the response speed.

[0006] A fuel cell stack test bench flow control method includes the steps of:

[0007] Obtaining the first temperature, the first pressure and the first humidity at the outlet of the humidifier;

[0008] Obtaining the second temperature, the second pressure and the second humidity at the inlet of the fuel cell stack;

[0009] Obtaining the total dry gas flow rate of the dry gas flowing into the dry gas path and the wet gas path;

[0010] Controlling the first flow rate of the gas in the dry gas path and the second flow rate of the gas in the wet gas path according to the changes of the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity and the total dry gas flow rate;

[0011] Wherein, the second flow rate is the total flow rate of the dry gas and the wet gas in the wet gas path.

[0012] In one embodiment, define the first flow rate as Qa1, the first temperature as T1, the first pressure as P1, the first humidity as RH1, the second temperature as T2, the second pressure as P2, the second humidity as RH2, and the total dry gas flow rate as Qa; Qa1, T1, P1, RH1, T2, P2, RH2, and Qa satisfy:

[0013] The f(T1) is the saturated vapor pressure at the outlet of the humidifier, and the f(T2) is the saturated vapor pressure at the inlet of the fuel cell stack.

[0014] In one embodiment, define the second flow rate as m, the first temperature as T1, the first pressure as P1, the first humidity as RH1, the second temperature as T2, the second pressure as P2, the second humidity as RH2, and the total dry gas flow rate as Qa; m, T1, P1, RH1, T2, P2, RH2, and Qa satisfy:

[0015] The f(T1) is the saturated vapor pressure at the outlet of the humidifier, and the f(T2) is the saturated vapor pressure at the inlet of the fuel cell stack; Mr is the relative molecular mass of the dry gas introduced into the gas path.

[0016] In one embodiment, the RH1 is 100%.

[0017] In one embodiment, it further includes the steps of:

[0018] Judging the relationship between the second humidity and the target humidity required by the fuel cell stack;

[0019] When the second humidity is not equal to the target humidity, obtaining the actual dew point temperature at the outlet of the humidifier based on the deviation, and correcting the first flow rate and the second flow rate.

[0020] A fuel cell stack test bench flow control system includes:

[0021] A dry gas path;

[0022] A wet gas path, connected to the dry gas path, and having a first junction point and a second junction point. The first junction point is connected to a gas source, and the second junction point is connected to a fuel cell stack; a humidifier is provided on the wet gas path.

[0023] The first mass flow controller is arranged on the dry gas path and is used to control the first flow rate of the dry gas path according to the changes of the first temperature, the first pressure and the first humidity at the outlet of the humidifier, the second temperature, the second pressure and the second humidity at the inlet of the fuel cell stack, and the total dry gas flow rate of the dry gas introduced into the dry gas path and the wet gas path;

[0024] The second mass flow controller is arranged on the wet gas path and downstream of the humidifier and is used to control the second flow rate in the wet gas path according to the changes of the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity and the total dry gas flow rate.

[0025] In one embodiment, it further includes:

[0026] The first temperature sensor, the first pressure sensor and the first humidity sensor are all arranged on the wet gas path and downstream of the humidifier; the first humidity sensor is used to detect the first temperature at the outlet of the humidifier, the first pressure sensor is used to detect the first pressure at the outlet of the humidifier, and the first humidity sensor is used to detect the first humidity at the outlet of the humidifier;

[0027] The second temperature sensor, the second pressure sensor and the second humidity sensor are all arranged between the second junction point and the fuel cell stack; the second temperature sensor is used to detect the second temperature at the inlet of the fuel cell stack, the second pressure sensor is used to detect the second pressure at the inlet of the fuel cell stack, and the second humidity sensor is used to detect the second humidity at the inlet of the fuel cell stack.

[0028] In one embodiment, it further includes:

[0029] The first heater and the second heater, the first heater is arranged on the dry gas path and downstream of the first mass flow controller, and the second heater is arranged between the second junction point and the fuel cell stack.

[0030] An electronic device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the method described in any one of the above claims.

[0031] A computer-readable storage medium, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to execute the fuel cell stack test bench flow control method described in any one of the above claims.

[0032] The above fuel cell stack test bench flow control method, system, electronic device and storage medium control the second flow rate of the gas in the wet gas path according to the changes in the first temperature, first humidity, second temperature, second pressure, second humidity and the total dry gas flow rate. The second flow rate is the total flow rate of the dry gas and the wet gas in the wet gas path, that is, the gas flow rate after the wet gas path passes through the humidifier. Compared with the prior art where the mass flow controller is placed upstream of the humidifier, the gas flow path from the flow control point to the back pressure valve section is shortened. And because the gas flow path is shortened, when the working condition changes, the actual flow rate and pressure at the fuel cell stack inlet can respond quickly, ensuring sufficient gas supply or meeting the working condition requirements, and the fuel cell stack test bench can meet the simulation ability requirements under all working conditions. At the same time, by controlling the first flow rate and the second flow rate simultaneously, the pressure inside the fuel cell stack is ensured to be within the preset range. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the fuel cell stack test bench flow control system provided by an embodiment of the present application;

[0034] Figure 2 It is a flowchart of the fuel cell stack test bench flow control method provided by an embodiment of the present application;

[0035] Figure 3 It is a block diagram of the electronic device of the fuel cell stack test bench flow control method provided by an embodiment of the present application.

[0036] 100. Fuel cell stack test bench flow control system; 10. Dry gas path; 20. Wet gas path; 30. First intersection point; 40. Second intersection point; 50. Humidifier; 60. First mass flow controller; 70. Second mass flow controller; 80. First temperature sensor; 90. First pressure sensor; 110. First humidity sensor; 120. Second temperature sensor; 130. Second pressure sensor; 140. Second humidity sensor; 150. First heater; 160. Second heater; 170. Back pressure valve; 200. Fuel cell stack. Detailed Embodiments

[0037] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that in the description of the present application, the claims and the above drawings, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0039] As described in the background art, in traditional stack testing technologies, when the working conditions change, the actual flow rate and pressure at the stack inlet cannot respond quickly, resulting in a large lag, which may cause the stack to be under-gassed or the gas supply to fail to meet the requirements of the working conditions, making the stack testing device unable to meet the simulation ability requirements under all working conditions. The root cause of the above problems is that in traditional technologies, the mass flow controller is generally placed upstream of the humidifier, so that the gas needs to pass through the humidifier, heater and corresponding pipelines in sequence from the flow control point to the back pressure valve section, resulting in a long gas flow path. It is precisely because of the long gas flow path that when the working conditions change, the actual flow rate and pressure at the stack inlet cannot respond quickly.

[0040] Refer to Figure 1 , Figure 1 which is a schematic diagram of the flow control system of the stack test bench provided by an embodiment of the present application.

[0041] To solve the above problems, the present application provides a stack test bench flow control system 100, which includes a dry gas path 10 and a wet gas path 20. The wet gas path 20 is connected to the dry gas path 10 and has a first intersection point 30 and a second intersection point 40. The first intersection point 30 is connected to a gas source, and the second intersection point 40 is connected to a stack 200. A humidifier 50 is provided on the wet gas path 20. The dry gas introduced into the wet gas path 20 is humidified by the humidifier 50 to form a mixed gas of dry gas and wet gas, and intersects with the dry gas flowing from the dry gas path 10 to the stack 200 at the second intersection point 40 and is jointly introduced into the stack 200.

[0042] It should be noted here that the stack test bench flow control system 100 can be used to control the gas flow rate of the cathode gas or the anode gas. Specifically, when applied to a hydrogen-oxygen fuel cell, the cathode gas is air and the anode gas is hydrogen. In some other embodiments, the type of gas used for the anode is not limited.

[0043] Continue to refer to Figure 1, the flow control system 100 of the fuel cell test bench further includes a first mass flow controller 60. The first mass flow controller 60 is arranged on the dry gas path 10 and is used to control the first flow rate of the dry gas flow 10 according to the changes of the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity, and the total dry gas flow rate. Among them, the first temperature is the temperature at the outlet of the humidifier 50, the first pressure is the pressure at the outlet of the humidifier 50, and the first humidity is the humidity at the outlet of the humidifier 50. The second temperature is the temperature at the inlet of the fuel cell 200, the second pressure is the pressure at the inlet of the fuel cell 200, and the second humidity is the humidity at the inlet of the fuel cell 200. The total dry gas flow rate is the sum of the flow rate introduced into the dry gas path 10 from the gas source and the flow rate introduced into the wet gas path 20.

[0044] The flow control system 100 of the fuel cell test bench further includes a second mass flow controller 70, which is arranged on the wet gas path 20 and downstream of the humidifier 50, and is used to control the second flow rate in the wet gas path 20 according to the changes of the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity, and the total dry gas flow rate. The second flow rate is the total flow rate of the dry gas and the wet gas in the wet gas path 20.

[0045] It should also be noted here that the mass flow controller can precisely measure and control the mass flow rate of gases or liquids. The first mass flow controller 60 adopts a mass flow controller based on the laminar flow principle or the thermal principle, and the second mass flow controller 70 adopts a Coriolis type mass flow controller, that is, the flowmeter in the wet gas path 20 adopts a Coriolis type mass flowmeter, and the flow control valve adopts a proportional valve for high-temperature and high-humidity media. The two form a Coriolis type mass flow controller.

[0046] In the flow control system 100 of the fuel cell test bench provided by the embodiment of the present application, the second mass flow controller 70 is placed downstream of the humidifier 50. Compared with the prior art where the mass flow controller is placed upstream of the humidifier 50, the gas flow path from the flow control point to the back pressure valve 170 is shortened. And because the gas flow path is shortened, when the working condition changes, the actual flow rate and pressure at the inlet of the fuel cell 200 can respond quickly, so that the gas supply is sufficient or meets the requirements of the working condition, and the fuel cell test bench can meet the simulation ability requirements under all working conditions. At the same time, the first mass flow controller 60 and the second mass flow controller 70 cooperate to control the gas flow rate, which can ensure that the pressure in the fuel cell 200 is within the preset range.

[0047] In one embodiment, continue to refer to Figure 1, the flow control system 100 of the fuel cell test bench further includes a first temperature sensor 80, a first pressure sensor 90, and a first humidity sensor 110. The first temperature sensor 80, the first pressure sensor 90, and the first humidity sensor 110 are all disposed on the wet gas path 20 and located at the outlet of the humidifier 50. The first temperature sensor 80 is used to detect the first temperature at the outlet of the humidifier 50, the first pressure sensor 90 is used to detect the first pressure at the outlet of the humidifier 50, and the first humidity sensor 110 is used to detect the first humidity at the outlet of the humidifier 50.

[0048] The flow control system 100 of the fuel cell test bench further includes a second temperature sensor 120, a second pressure sensor 130, and a second humidity sensor 140. The second temperature sensor 120, the second pressure sensor 130, and the second humidity sensor 140 are all disposed between the second junction point 40 and the fuel cell 200. The second temperature sensor 120 is used to detect the second temperature at the inlet of the fuel cell 200, the second pressure sensor 130 is used to detect the second pressure at the inlet of the fuel cell 200, and the second humidity sensor 140 is used to detect the second humidity at the inlet of the fuel cell 200.

[0049] It should be noted here that the types of the first temperature sensor 80, the first pressure sensor 90, the first humidity sensor 110, the second temperature sensor 120, the second pressure sensor 130, and the second humidity sensor 140 are not limited, as long as the corresponding detection functions can be realized.

[0050] In one embodiment, the flow control system 100 of the fuel cell test bench further includes a first heater 150 and a second heater 160. The first heater 150 is disposed on the dry gas path 10 and located downstream of the first mass flow controller 60, and the second heater 160 is disposed between the second junction point 40 and the fuel cell 200. The first heater 150 is used to heat the dry air in the dry gas path 10, and the second heater 160 is used to heat the gas about to flow into the fuel cell 200. By cooperating the first heater 150 and the second heater 160, the temperature of the gas flowing into the fuel cell 200 is within a preset range.

[0051] Furthermore, the flow control system 100 of the fuel cell test bench further includes a back pressure valve 170. The back pressure valve 170 is disposed on the outlet side of the fuel cell 200 to control the pressure difference between both sides of the proton exchange membrane of the fuel cell 200 within a certain range.

[0052] Refer to Figure 2 , Figure 2 is a flowchart of the fuel cell test bench flow control method provided by an embodiment of the present application.

[0053] Another embodiment of the present application further provides a fuel cell test bench flow control method, including the steps:

[0054] S110: Obtain the first temperature, first pressure, and first humidity at the outlet of the humidifier 50;

[0055] S12: Obtain the second temperature, second pressure, and second humidity at the inlet of the fuel cell stack 200;

[0056] Specifically, based on the membrane back pressure valve 170, control the gas pressure at the inlet of the fuel cell stack 200 to be the second pressure, and based on the heater, control the gas temperature at the inlet of the fuel cell stack 200 to be the second temperature.

[0057] S130: Obtain the total dry gas flow rate of the dry gas flowing into the dry gas path 10 and the wet gas path 20;

[0058] S140: Control the first flow rate of the gas in the dry gas path 10 and the second flow rate of the gas in the wet gas path 20 according to the changes in the first temperature, first pressure, first humidity, second temperature, second pressure, second humidity, and total dry gas flow rate;

[0059] Wherein, the second flow rate is the total flow rate of the dry gas and the wet gas in the wet gas path 20.

[0060] The fuel cell stack test bench flow control method provided by the embodiments of the present application controls the second flow rate of the gas in the wet gas path 20 according to the changes in the first temperature, first humidity, second temperature, second pressure, second humidity, and total dry gas flow rate. The second flow rate is the total flow rate of the dry gas and the wet gas in the wet gas path 20, that is, it controls the gas flow rate of the wet gas path 20 after being humidified by the humidifier 50. Compared with the prior art where the mass flow controller is placed upstream of the humidifier 50, the gas flow path from the flow control point to the back pressure valve 170 is shortened. And due to the shortening of the gas flow path, when the working condition changes, the actual flow rate and pressure at the inlet of the fuel cell stack 200 can respond quickly, so that the gas supply is sufficient or meets the working condition requirements, and the fuel cell stack test bench can meet the simulation ability requirements under all working conditions. At the same time, by controlling the first flow rate and the second flow rate simultaneously, the pressure inside the fuel cell stack 200 is ensured to be within the preset range.

[0061] Further, the first temperature, first pressure, and first humidity are respectively obtained by the first temperature sensor 80, the first pressure sensor 90, and the first humidity sensor 110. The second temperature, second pressure, and second humidity are respectively obtained by the second temperature sensor 120, the second pressure sensor 130, and the second humidity sensor 140. The first flow rate is controlled by the first mass flow controller 60, and the second flow rate is controlled by the second mass flow controller 70.

[0062] Define the first temperature as T1, the first pressure as P1, the first humidity as RH1, the second temperature as T2, the second pressure as P2, the second humidity as RH2, and the total dry gas flow rate as Qa. Qa = Qa1 + Qa2, where Qa1 is the dry gas flow rate of the dry gas path 10 and Qa2 is the dry gas flow rate of the wet gas path 20. Herein, the units of Qa, Qa1, and Qa2 are sLPM, and all of them are volume flow rates.

[0063] According to the required target state, the water vapor flow rate Qw can be calculated. Where Psat2 is the saturation vapor pressure at the inlet of the fuel cell stack 200, which can be calculated using the Antoine equation and is related to the temperature at this point, abbreviated as Psat2 = f(T2).

[0064] The water vapor flow rate obtained from the above formula is: Psat1 = f(T1), where Psat1 is the saturation vapor pressure at the outlet of the humidifier 50.

[0065] Similarly, the water vapor flow rate is calculated using the parameters at the outlet of the humidifier 50 as: Wherein, Psat1 = f(T1). In a specific embodiment, RH1 is 100%. Since the water vapor at the inlet of the fuel cell stack 200 comes from the wet gas path 20, then: It can be obtained that

[0066] The first flow rate controlled by the first mass flow controller 60 is:

[0067]

[0068] The second flow rate controlled by the second mass flow controller 70 is:

[0069]

[0070] Wherein, Mr is the relative molecular mass of the dry gas (including the dry gas path 10 and the wet gas path 20) introduced into the gas path, and 22.4 is the volume of one mole of gas under standard conditions.

[0071] It should be noted here that for the cathode side, when the gas introduced is air, Mr is 29. For the anode side, when the gas introduced is hydrogen, Mr is 2.

[0072] In one embodiment, the first flow rate of the dry gas path 10 is controlled as: The second flow rate of the wet gas path 20 is: In this way, the pressure inside the fuel cell stack 200 is always ensured to be within the preset range. Wherein, m is the mass flow rate.

[0073] In one embodiment, during operation, the temperature of the humidifier 50 is always kept constant, that is, the dew point temperature at the outlet of the humidifier 50 is maintained at a stable value.

[0074] In other embodiments, it is also possible to determine whether the humidifier 50 is in a normal state and perform flow correction on the mass flow controllers of the dry gas path 10 and the wet gas path 20 based on a mathematical model. Specifically, it further includes the steps of:

[0075] Determine the relationship between the second humidity and the target humidity required by the fuel cell stack 200;

[0076] Specifically, the target humidity is preset and is the humidity that meets the performance requirements of the fuel cell stack 200, and the second humidity is the humidity obtained by detection.

[0077] When the second humidity is not equal to the target humidity, obtain the actual dew point temperature at the outlet of the humidifier 50 based on the deviation, and correct the first flow rate and the second flow rate.

[0078] Specifically, when the second humidity is less than the target humidity or the second humidity is greater than the target humidity, obtain the actual dew point temperature at the outlet of the humidifier 50 based on the deviation between the second humidity and the target humidity, and correct the first flow rate and the second flow rate to always ensure that the pressure in the fuel cell stack 200 is within the preset range.

[0079] Figure 3 It is a block diagram of an electronic device for the flow control method of the fuel cell stack test bench provided by the embodiment of the present application. This electronic device can be a terminal, and its internal structure diagram can be as Figure 3 shown. This electronic device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of this electronic device is used to provide computing and control capabilities. The memory of this electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of this electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it realizes a flow control method for a fuel cell stack test bench. The display screen of this electronic device can be a liquid crystal display screen or an electronic ink display screen, and the input device of this electronic device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the housing of the electronic device, or an external keyboard, a touchpad, or a mouse, etc.

[0080] Those skilled in the art can understand, Figure 3The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the electronic device to which the solution of this application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have a different component arrangement.

[0081] In an exemplary embodiment, an electronic device is further provided, including: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to execute the instructions to implement the method in the embodiment of this application.

[0082] In an exemplary embodiment, a computer-readable storage medium is further provided. When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device can execute the method in the embodiment of this application.

[0083] In an exemplary embodiment, a computer program product including instructions is further provided. When it runs on a computer, the computer executes the method in the embodiment of this application.

[0084] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it may include the processes of the embodiments of the above methods. Among them, any reference to the memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memories. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0085] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0086] The embodiments described above merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A flow control method for an electric stack test bench, characterized in that, Including the steps of: Obtaining the first temperature, the first pressure, and the first humidity at the outlet of the humidifier; Obtaining the second temperature, the second pressure, and the second humidity at the inlet of the fuel cell stack; Obtaining the total dry gas flow rate of the dry gas introduced into the dry gas path and the wet gas path; Controlling the first flow rate of the gas in the dry gas path and the second flow rate of the gas in the wet gas path according to the changes in the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity, and the total dry gas flow rate; Wherein, the second flow rate is the total flow rate of the dry gas and the wet gas formed after the gas in the wet gas path is humidified by the humidifier.

2. The flow control method of the stack test bench according to claim 1, characterized in that Defining the first flow rate as Qa1, the first temperature as T1, the first pressure as P1, the first humidity as RH1, the second temperature as T2, the second pressure as P2, the second humidity as RH2, and the total dry gas flow rate as Qa; Qa1, T1, P1, RH1, T2, P2, RH2, and Qa satisfy: The f(T1) is the saturated vapor pressure at the outlet of the humidifier, and the f(T2) is the saturated vapor pressure at the inlet of the fuel cell stack.

3. The flow control method of the fuel cell stack test bench according to claim 1, wherein Defining the second flow rate as m, the first temperature as T1, the first pressure as P1, the first humidity as RH1, the second temperature as T2, the second pressure as P2, the second humidity as RH2, and the total dry gas flow rate as Qa; m, T1, P1, RH1, T2, P2, RH2, and Qa satisfy: The f(T1) is the saturated vapor pressure at the outlet of the humidifier, and the f(T2) is the saturated vapor pressure at the inlet of the fuel cell stack; the Mr is the relative molecular mass of the dry gas introduced into the gas path.

4. The flow control method of the stack test bench according to claim 2 or 3, characterized in that The RH1 is 100%.

5. The flow control method of the stack test bench according to claim 1, characterized in that, Further including the steps of: Judging the relationship between the second humidity and the target humidity required by the fuel cell stack; When the second humidity is not equal to the target humidity, obtaining the actual dew point temperature at the outlet of the humidifier based on the deviation, and correcting the first flow rate and the second flow rate.

6. A flow control system for an electric stack test bench, characterized in that, Including: A dry gas path; A wet gas path, connected to the dry gas path, and having a first junction point and a second junction point, the first junction point is connected to the gas source, and the second junction point is connected to the fuel cell stack; a humidifier is provided on the wet gas path; A first mass flow controller, provided on the dry gas path, for controlling the first flow rate of the dry gas path according to the changes in the first temperature, the first pressure, and the first humidity at the outlet of the humidifier, the second temperature, the second pressure, and the second humidity at the inlet of the fuel cell stack, and the total dry gas flow rate of the dry gas introduced into the dry gas path and the wet gas path; A second mass flow controller, provided on the wet gas path and downstream of the humidifier, for controlling the second flow rate in the wet gas path according to the changes in the first temperature, the first pressure, the first humidity, the second temperature, the second pressure, the second humidity, and the total dry gas flow rate.

7. The flow control system of the stack test bench according to claim 6, characterized in that, Further including: A first temperature sensor, a first pressure sensor, and a first humidity sensor, all provided on the wet gas path and downstream of the humidifier; The first humidity sensor is used to detect the first temperature at the outlet of the humidifier, the first pressure sensor is used to detect the first pressure at the outlet of the humidifier, and the first humidity sensor is used to detect the first humidity at the outlet of the humidifier; The second temperature sensor, the second pressure sensor, and the second humidity sensor are all disposed between the second junction point and the fuel cell stack; the second temperature sensor is used to detect the second temperature at the inlet of the fuel cell stack, the second pressure sensor is used to detect the second pressure at the inlet of the fuel cell stack (200), and the second humidity sensor is used to detect the second humidity at the inlet of the fuel cell stack.

8. The flow control system of the stack test bench according to claim 6, characterized in that, Further comprising: A first heater and a second heater, the first heater is disposed on the dry gas path and downstream of the first mass flow controller, and the second heater is disposed between the second junction point and the fuel cell stack.

9. An electronic device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device is enabled to execute the fuel cell stack test bench flow control method according to any one of claims 1 to 5.

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