CN114976150A - Method, apparatus, device and medium for detecting single cell leakage in fuel cell stack - Google Patents

Method, apparatus, device and medium for detecting single cell leakage in fuel cell stack Download PDF

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CN114976150A
CN114976150A CN202210704911.7A CN202210704911A CN114976150A CN 114976150 A CN114976150 A CN 114976150A CN 202210704911 A CN202210704911 A CN 202210704911A CN 114976150 A CN114976150 A CN 114976150A
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hydrogen
nitrogen
pressure
single cell
pipeline
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CN114976150B (en
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鲍金成
赵洪辉
韩令海
马秋玉
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FAW Group Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0432—Temperature; Ambient temperature
    • H01M8/04328—Temperature; Ambient temperature of anode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0432—Temperature; Ambient temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04402—Pressure; Ambient pressure; Flow of anode exhausts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04552—Voltage of the individual fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04664—Failure or abnormal function
    • H01M8/04671—Failure or abnormal function of the individual fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The embodiment of the invention discloses a method, a device, equipment and a medium for detecting single cell leakage in a fuel cell stack. The method comprises the following steps: purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile; introducing hydrogen into the hydrogen pipeline and introducing nitrogen into the air pipeline; acquiring hydrogen parameters of a hydrogen pipeline and nitrogen parameters of an air pipeline, and acquiring hydrogen permeation voltage of each single cell in the pile; the hydrogen parameters include inlet hydrogen temperature and outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure; and determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile. According to the technical scheme, the hydrogen leakage amount of each monocell in the galvanic pile can be accurately calculated, whether monocell gas leakage exists or not is judged, and whether monocell gas leakage caused by damage of the proton exchange membrane can be accurately judged or not.

Description

Method, apparatus, device and medium for detecting single cell leakage in fuel cell stack
Technical Field
The invention relates to the technical field of fuel cell detection, in particular to a method, a device, equipment and a medium for detecting single cell leakage in a fuel cell stack.
Background
With the continuous improvement of energy consciousness and environmental protection consciousness of people, new energy automobiles are gradually concerned, and especially hydrogen fuel cell automobiles are favored. Wherein the fuel cell engine is the heart of a fuel cell vehicle. The air tightness of the fuel cell stack as a core component of a fuel cell engine has an important influence on the safety and performance of the fuel cell stack. Therefore, how to improve the accurate detection of the air tightness of the electric pile is one of the problems to be solved urgently in the field of fuel cell detection.
In the prior art, hydrogen and air are often used as input gases of a fuel cell stack, outlets of an air pipeline, a hydrogen pipeline and a cooling water pipeline of the stack are sealed, gas with certain pressure is applied to an inlet, and whether the stack is integrally leaked or not is determined through pressure maintaining leakage conditions.
However, this solution can only roughly determine whether or not there is a gas leak in the entire stack, but cannot determine how much the leak amount is, nor which cell in the stack has a gas leak. In addition, the single cell gas leakage may be caused by damage to the proton exchange membrane, an abnormal water content, or poisoning of the catalyst. If hydrogen and air are used as input gases of the galvanic pile, chemical reaction can occur in the galvanic pile, so that influence factors are increased, and whether single cell gas leakage caused by damage of the proton exchange membrane can not be accurately judged.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for detecting single cell leakage in a fuel cell stack, which can accurately calculate the hydrogen leakage amount of each single cell in the stack, judge whether single cell gas leakage exists or not and accurately judge whether single cell gas leakage caused by damage of a proton exchange membrane exists or not.
According to an aspect of the present invention, there is provided a single cell leak detection method in a fuel cell stack, the method comprising:
purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile;
introducing hydrogen into the hydrogen pipeline, and introducing nitrogen into the air pipeline;
acquiring hydrogen parameters of the hydrogen pipeline and nitrogen parameters of the air pipeline, and acquiring hydrogen permeation voltage of each single cell in the galvanic pile; the hydrogen parameters include an inlet hydrogen temperature and an outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure;
and determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
Optionally, determining a hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter, and the hydrogen permeation voltage includes:
determining hydrogen permeation pressure according to the hydrogen parameters and the hydrogen permeation voltage;
determining a first vapor pressure of the hydrogen line based on the hydrogen parameter, and determining a second vapor pressure of the air line based on the inlet nitrogen temperature and the outlet nitrogen pressure;
determining a hydrogen leak amount from the outlet hydrogen pressure, the inlet nitrogen flow rate, the first water vapor pressure, the second water vapor pressure, and the hydrogen permeation pressure.
Optionally, the calculation formula of the hydrogen permeation pressure is as follows:
Figure BDA0003704955110000021
wherein the content of the first and second substances,
Figure BDA0003704955110000022
in order to obtain the hydrogen gas permeation pressure,
Figure BDA0003704955110000023
for the outlet hydrogen pressure, E is the hydrogen permeation voltage, T is the inlet hydrogen temperature, R is the ideal gas constant, and F is the Faraday constant.
Optionally, the calculation formula of the hydrogen leakage amount is as follows:
Figure BDA0003704955110000031
wherein the content of the first and second substances,
Figure BDA0003704955110000032
the leakage amount of the hydrogen gas is the leakage amount of the hydrogen gas,
Figure BDA0003704955110000033
is the flow rate of the nitrogen at the inlet,
Figure BDA0003704955110000034
the outlet hydrogen pressure is the pressure of the hydrogen gas,
Figure BDA0003704955110000035
is the hydrogen osmotic pressure, P w,a Is a first water vapor pressure, P w,c A second vapor pressure.
Optionally, after determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter, and the hydrogen permeation voltage, the method further includes:
judging whether the hydrogen leakage amount of each single cell in the galvanic pile meets a preset permeation condition or not;
if yes, continuing the galvanic pile test;
if not, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target cell is a preset number of cells adjacent to the first target cell;
and determining the hydrogen leakage amount of the target single cell.
Optionally, after determining the hydrogen leakage amount of the target cell, the method further includes:
judging whether the hydrogen leakage amount of the target single cell meets the preset permeation condition or not;
if so, reinstalling the target single cell to the cell stack to continue the cell stack test;
and if not, replacing the target single cell, and installing the replaced target single cell to the cell stack to continue the cell stack test.
Optionally, determining the first water vapor pressure of the hydrogen pipeline according to the hydrogen parameter includes:
obtaining a first vapor pressure by querying a dew point temperature comparison table based on the hydrogen parameter;
determining a second vapor pressure of the air line from the inlet nitrogen temperature and the outlet nitrogen pressure, comprising:
a second vapor pressure is obtained by querying a dew point temperature look-up table based on the inlet nitrogen temperature and the outlet nitrogen pressure.
According to another aspect of the present invention, there is provided a single cell leakage detection apparatus in a fuel cell stack, including:
the purging module is used for purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile;
the ventilation module is used for introducing hydrogen into the hydrogen pipeline and introducing nitrogen into the air pipeline;
the parameter acquisition module is used for acquiring hydrogen parameters of the hydrogen pipeline and nitrogen parameters of the air pipeline and acquiring hydrogen permeation voltage of each single cell in the galvanic pile; the hydrogen parameters include an inlet hydrogen temperature and an outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure;
and the hydrogen leakage amount determining module is used for determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
According to another aspect of the present invention, there is provided an electronic device for single cell leakage detection in a fuel cell stack, the electronic device including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform a method of detecting a single cell leak in a fuel cell stack according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement a method for detecting a single-cell leak in a fuel cell stack according to any one of the embodiments of the present invention when the computer instructions are executed.
According to the technical scheme of the embodiment of the invention, the hydrogen pipeline and the air pipeline are purged; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile; introducing hydrogen into the hydrogen pipeline and introducing nitrogen into the air pipeline; acquiring hydrogen parameters of a hydrogen pipeline and nitrogen parameters of an air pipeline, and acquiring hydrogen permeation voltage of each single cell in the pile; the hydrogen parameters include inlet hydrogen temperature and outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure; and determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile. According to the technical scheme, the hydrogen leakage amount of each monocell in the galvanic pile can be accurately calculated, whether monocell gas leakage exists or not is judged, and whether monocell gas leakage caused by damage of a proton exchange membrane is caused or not can be accurately judged.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting a single-cell leak in a fuel cell stack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a single cell leak detection system in a fuel cell stack according to an embodiment of the present invention;
FIG. 3 is a flow chart of a single cell leakage detection method in a fuel cell stack according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a single-cell leakage detection device in a fuel cell stack according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device implementing a single cell leakage detection method in a fuel cell stack according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," "target," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a single cell leakage detection method in a fuel cell stack according to an embodiment of the present invention, where the present embodiment is applicable to a case where gas leakage is detected inside a single cell in the fuel cell stack, and the method may be performed by a single cell leakage detection apparatus in the fuel cell stack, where the single cell leakage detection apparatus in the fuel cell stack may be implemented in a form of hardware and/or software, and the single cell leakage detection apparatus in the fuel cell stack may be configured in an electronic device with data processing capability. As shown in fig. 1, the method includes:
s110, purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile.
The technical scheme of the embodiment can be executed by a single-cell leakage detection system in the fuel cell stack, and is suitable for performing air tightness detection on the inside of the stack before and during a stack bench test. The method is mainly used for detecting whether gas leakage exists in the galvanic pile or not before the test, and mainly used for monitoring the airtightness state in the galvanic pile and performing problem analysis when a fault occurs in the test process. Fig. 2 is a schematic diagram of a single cell leakage detection system in a fuel cell stack according to an embodiment of the present invention. As shown in fig. 2, the system includes a stack, a hydrogen gas line, an air line, a cooling water line, an FCU (fuel cell main controller), and a CVM (fuel cell stack inspection), and shut-off valves and sensors of different types are provided at the inlet and outlet of the hydrogen gas line and the air line. Wherein PT is a pressure sensor, TT is a temperature sensor, MT is a flow sensor, HT is a hydrogen concentration sensor, RH is a humidity sensor, H1-H10 represents a hydrogen pipeline, and A1-A8 represents an air pipeline.
In this embodiment, before the air tightness of the stack is detected, the stack is first mounted and fixed on a test bed, the inlets and outlets of the hydrogen pipeline, the air pipeline and the cooling water channel are connected and fixed with the stack, and simultaneously, each single cell in the stack is mounted with a CVM for voltage detection. After the components in the system are installed and fixed, the hydrogen pipeline and the hydrogen pipeline need to be purged, so that gas, moisture and impurities in the two pipelines are removed. In particular, the two gas lines may be purged with a less chemically active gas, such as nitrogen or an inert gas. In addition, because the internal states of different galvanic piles are different, the purging time and the purging gas pressure can be flexibly set according to the actual galvanic pile characteristics in the purging link.
And S120, introducing hydrogen into the hydrogen pipeline, and introducing nitrogen into the air pipeline.
In this embodiment, after the purging of the gas line is completed, dry hydrogen is introduced into the hydrogen line, and dry nitrogen is introduced into the air line. It should be noted that, in order to eliminate the complicated influence factor caused by the reaction inside the stack, nitrogen with low chemical activity is introduced into the air pipeline in the present embodiment. In addition to nitrogen, other less chemically reactive gases, such as inert gases, may also be used. Nitrogen is selected in this example because of its relatively low cost.
In addition, the temperature, pressure and flow rate of the hydrogen and nitrogen gases can be preset by adjusting the sensors at the inlet and outlet of the hydrogen gas line and the air line. For example, to avoid the interference of temperature and flow rate, the temperature of the two gases can be kept consistent (e.g. 60 degrees) by adjusting the temperature sensor at the inlet of the gas pipeline, and the flow rate of the two gases can be set to 5slm by adjusting the flow sensor at the inlet of the gas pipeline. The output pressure of the air pipeline can also be 1 standard atmospheric pressure by adjusting stop valves at the positions of two outlets, and the output pressure of the hydrogen pipeline is 20kpa higher than that of the air pipeline.
S130, acquiring hydrogen parameters of a hydrogen pipeline and nitrogen parameters of an air pipeline, and acquiring hydrogen permeation voltage of each single cell in the pile; the hydrogen parameters include inlet hydrogen temperature and outlet hydrogen pressure; the nitrogen parameters included inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure.
The hydrogen permeation voltage may be a voltage caused by permeation of hydrogen. The inlet hydrogen temperature may refer to the hydrogen temperature at the inlet of the hydrogen gas conduit. The outlet hydrogen pressure may refer to the hydrogen pressure at the outlet of the hydrogen line. The inlet nitrogen temperature may refer to the nitrogen temperature at the inlet of the air line. The inlet nitrogen flow rate may refer to the nitrogen flow rate at the inlet of the air line. The outlet nitrogen pressure may refer to the nitrogen pressure at the outlet of the air line.
In this embodiment, the hydrogen parameters and the nitrogen parameters can be obtained by sensors at the inlet and outlet of the hydrogen pipeline and the air pipeline. Specifically, the inlet hydrogen temperature may be obtained by a temperature sensor at the inlet of the hydrogen pipeline, the outlet hydrogen pressure may be obtained by a pressure sensor at the outlet of the hydrogen pipeline, the inlet nitrogen temperature may be obtained by a temperature sensor at the inlet of the air pipeline, the inlet nitrogen flow rate may be obtained by a flow sensor at the inlet of the air pipeline, and the outlet nitrogen pressure may be obtained by a pressure sensor at the outlet of the air pipeline. In addition, each cell in the stack may be equipped with a CVM, by which the hydrogen permeation voltage of each cell in the stack is obtained.
And S140, determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
The hydrogen leakage amount may be a leaked hydrogen flow amount. In this embodiment, for each cell in the stack, the hydrogen leakage amount may be determined according to the hydrogen parameter, the nitrogen parameter, and the hydrogen permeation voltage. Optionally, the hydrogen leakage amount is determined according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage, and the method comprises the following steps: determining hydrogen permeation pressure according to the hydrogen parameters and the hydrogen permeation voltage; determining a first water vapor pressure of the hydrogen pipeline according to the hydrogen parameters, and determining a second water vapor pressure of the air pipeline according to the inlet nitrogen temperature and the outlet nitrogen pressure; and determining the hydrogen leakage amount according to the outlet hydrogen pressure, the inlet nitrogen flow, the first water vapor pressure, the second water vapor pressure and the hydrogen permeation pressure.
The hydrogen permeation pressure may be a pressure generated by hydrogen permeated into the air line. The first water vapor pressure may refer to the pressure generated by water vapor in the hydrogen gas line. The second water vapor pressure may refer to the pressure generated by the water vapor in the air line.
In this embodiment, when determining the hydrogen leakage amount of each unit cell in the stack, the hydrogen permeation pressure may be determined according to the hydrogen parameter and the hydrogen permeation voltage. Alternatively, the calculation formula of the hydrogen permeation pressure is as follows:
Figure BDA0003704955110000091
wherein the content of the first and second substances,
Figure BDA0003704955110000092
in order to obtain the hydrogen gas permeation pressure,
Figure BDA0003704955110000093
for the outlet hydrogen pressure, E is the hydrogen permeation voltage, T is the inlet hydrogen temperature, R is the ideal gas constant, and F is the Faraday constant.
After determining the hydrogen permeation pressure, a first vapor pressure for the hydrogen line may be determined based on the inlet hydrogen temperature and the outlet hydrogen pressure, while a second vapor pressure for the air line may be determined based on the inlet nitrogen temperature and the outlet nitrogen pressure. Optionally, determining the first water vapor pressure of the hydrogen pipeline according to the hydrogen parameter includes: acquiring a first vapor pressure by inquiring a dew point temperature comparison table based on the hydrogen parameter; determining a second vapor pressure of the air line based on the inlet nitrogen temperature and the outlet nitrogen pressure, comprising: based on the inlet nitrogen temperature and the outlet nitrogen pressure, a second vapor pressure is obtained by querying a dew point temperature look-up table. The dew point temperature may be a temperature at which the water vapor and the water reach an equilibrium state. Specifically, the dew point temperature comparison table contains the corresponding relation between the gas temperature and the water vapor, and if the gas temperature and the gas pressure are known, parameters such as the content and the pressure of the water vapor can be inquired through the dew point temperature comparison table. In this embodiment, the first steam pressure may be obtained by querying a dew point temperature comparison table based on the inlet hydrogen temperature and the outlet hydrogen pressure, and the second steam pressure may be obtained by querying the dew point temperature comparison table based on the inlet nitrogen temperature and the outlet nitrogen pressure.
After the hydrogen permeation pressure and the water vapor pressures of the two gas lines are determined, the hydrogen leakage amount can be determined according to the outlet hydrogen pressure, the inlet nitrogen flow, the first water vapor pressure, the second water vapor pressure and the hydrogen permeation pressure. Optionally, the calculation formula of the hydrogen leakage amount is as follows:
Figure BDA0003704955110000094
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003704955110000095
the leakage amount of the hydrogen gas is the leakage amount of the hydrogen gas,
Figure BDA0003704955110000096
is the flow rate of the nitrogen at the inlet,
Figure BDA0003704955110000097
the outlet hydrogen pressure is the pressure of the hydrogen gas,
Figure BDA0003704955110000098
is the hydrogen osmotic pressure, P w,a Is a first water vapor pressure, P w,c A second vapor pressure.
It should be noted that, since the hydrogen gas input in the hydrogen gas pipeline does not chemically react with the nitrogen gas input in the air pipeline, the whole stack is in a non-working state. In this case, the hydrogen and nitrogen parameters of the entire stack may be considered as the hydrogen and nitrogen parameters of each cell in the stack. Although there may be parameter differences due to different arrangement positions of the single cells in the stack, the differences are very slight in the non-operating state and thus can be ignored.
Through the arrangement, the hydrogen leakage amount of each single cell in the cell stack can be accurately calculated, and whether the single cell gas leakage exists can be judged according to the hydrogen leakage amount.
According to the technical scheme of the embodiment of the invention, the hydrogen pipeline and the air pipeline are purged; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile; introducing hydrogen into the hydrogen pipeline and introducing nitrogen into the air pipeline; acquiring hydrogen parameters of a hydrogen pipeline and nitrogen parameters of an air pipeline, and acquiring hydrogen permeation voltage of each single cell in the pile; the hydrogen parameters include inlet hydrogen temperature and outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure; and determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile. According to the technical scheme, the hydrogen leakage amount of each monocell in the galvanic pile can be accurately calculated, whether monocell gas leakage exists or not is judged, and whether monocell gas leakage caused by damage of a proton exchange membrane is caused or not can be accurately judged.
Example two
Fig. 3 is a flowchart of a method for detecting single cell leakage in a fuel cell stack according to a second embodiment of the present invention, which is optimized based on the second embodiment. The concrete optimization is as follows: after the hydrogen leakage amount is determined according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage, the method further comprises the following steps: judging whether the hydrogen leakage amount of each single cell in the cell stack meets a preset permeation condition or not; if yes, continuing the galvanic pile test; if not, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target cell is a preset number of cells adjacent to the first target cell; the hydrogen gas leakage amount of the target cell is determined.
As shown in fig. 3, the method of this embodiment specifically includes the following steps:
s310, purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile.
And S320, introducing hydrogen into the hydrogen pipeline, and introducing nitrogen into the air pipeline.
S330, acquiring hydrogen parameters of a hydrogen pipeline and nitrogen parameters of an air pipeline, and acquiring hydrogen permeation voltage of each single cell in the pile; the hydrogen parameters include inlet hydrogen temperature and outlet hydrogen pressure; the nitrogen parameters included inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure.
And S340, determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
The implementation manners of S310-S340 can be referred to in the detailed descriptions of S110-S140.
And S350, judging whether the hydrogen leakage amount of each single cell in the cell stack meets a preset permeation condition, if so, executing S360, and otherwise, executing S370-S380.
The preset permeation condition may be a preset permeation condition. Specifically, the preset permeation condition may be set according to a stack design value. The design value of the galvanic pile can refer to the maximum hydrogen permeation amount of the proton exchange membrane in a normal permeation state. For example, the preset permeation condition may be set such that the hydrogen leakage amount is less than or equal to the stack design value. It should be noted that, a gas permeation phenomenon may exist inside the stack under a normal condition, and if the hydrogen gas leakage amount is greater than the maximum gas permeation amount under a normal permeation state, it may be determined that a gas leakage fault exists inside the stack.
In this embodiment, after the hydrogen leakage amount of each unit cell in the stack is determined, it may be further determined whether the hydrogen leakage amount of each unit cell in the stack meets a preset permeation condition. It can be understood that if the hydrogen leakage rate of each single cell in the stack meets the preset permeation condition, the stack can be indicated to be in a normal state, that is, no fault occurs inside the stack; if the hydrogen leakage amount of the monocell in the electric pile does not accord with the preset permeation condition, the electric pile can be indicated to be in an abnormal state, namely the monocell fault exists in the electric pile.
And S360, continuing the galvanic pile test.
In this embodiment, when the hydrogen leakage amount of all the cells in the stack meets the preset permeation condition, it can be shown that each cell is in a normal state, and at this time, the stack test can be continued without any treatment on the stack.
S370, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target battery cell is a preset number of battery cells adjacent to the first target battery cell.
Among them, the target battery cells may include a first target battery cell and a second target battery cell. The first target single cell is a single cell which does not meet the preset permeation condition in the stack; the second target battery cell is a preset number of battery cells adjacent to the first target battery cell. The preset number may refer to a preset number of battery cells adjacent to the first target battery cell, and for example, the preset number may be 2. It should be noted that the number of the first target cells may be 1 or more, depending on the number of cells in the stack that do not meet the preset percolation condition. For example, assuming that the number of first target battery cells is 1 and the preset number is 2, the number of second target battery cells is 2 and the number of target battery cells is 3.
In this embodiment, when the hydrogen leakage amount of the cells in the stack does not meet the preset permeation condition, the cells that do not meet the preset permeation condition are determined as first target cells, a preset number of cells adjacent to the first target cells are determined as second target cells, and then the first target cells and the second target cells may be determined as target cells, and the target cells are removed from the stack for further detection to verify whether the target cells themselves are damaged.
It should be noted that, for a single cell whose hydrogen leakage amount does not meet the preset permeation condition, it cannot be directly determined that there is gas leakage inside the single cell, and there is a possibility that a problem is likely to occur at a certain position due to the influence of the arrangement position of the single cell in the cell stack, rather than the single cell itself failing, that is, there may be a case that the single cell is normally placed in the cell stack but fails when being placed alone. In this case, the cell itself is not damaged, and a cell stack failure occurs even if the cell is replaced, and at this time, it is necessary to further investigate whether or not there is a problem in cell stack design or the like.
And S380, determining the hydrogen leakage amount of the target single cell.
In this embodiment, after the target single cell is determined, each target single cell may be individually detected according to the method for determining the hydrogen leakage amount of each single cell in the stack described in the first embodiment, so as to determine the hydrogen leakage amount of the target single cell, which is not described herein again.
In this embodiment, optionally, after determining the hydrogen gas leakage amount of the target cell, the method further includes: judging whether the hydrogen leakage amount of the target single cell meets a preset permeation condition or not; if so, reinstalling the target single cell to the cell stack to continue the cell stack test; and if not, replacing the target single cell, and installing the replaced target single cell to the cell stack to continue the cell stack test.
In the present embodiment, after the hydrogen leakage amount of the target cell is determined, it is further determined whether the hydrogen leakage amount of the target cell meets the preset permeation condition. If the current is consistent with the preset current, the target single cell is not damaged, and the target single cell can be reinstalled to the stack to continue the stack test; if the single cells do not meet the requirements, the single cells are damaged in the target single cells, the damaged single cells can be replaced, meanwhile, the single cells which are not damaged are reserved, and the replaced single cells are installed on the cell stack to continue the cell stack test.
Through the arrangement, whether the monocell is damaged or not can be accurately judged under the condition of eliminating the interference of the galvanic pile, and the rapid and effective analysis of the faults of the galvanic pile is facilitated.
According to the technical scheme of the embodiment of the invention, after the hydrogen leakage amount is determined according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage, whether the hydrogen leakage amount of each single cell in the galvanic pile meets the preset permeation condition is judged; if yes, continuing the galvanic pile test; if not, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target cell is a preset number of cells adjacent to the first target cell; the hydrogen gas leakage amount of the target cell is determined. According to the technical scheme, whether the monocell is damaged or not can be accurately judged under the condition of eliminating the interference of the galvanic pile, and the quick and effective analysis of the galvanic pile faults is facilitated.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a single cell leakage detection apparatus in a fuel cell stack according to a third embodiment of the present invention, where the apparatus is capable of executing the single cell leakage detection method in the fuel cell stack according to any embodiment of the present invention, and has corresponding functional modules and beneficial effects of the execution method. As shown in fig. 4, the apparatus includes:
a purge module 410 for purging the hydrogen line and the air line; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile;
a ventilation module 420, configured to introduce hydrogen into the hydrogen pipeline and introduce nitrogen into the air pipeline;
a parameter obtaining module 430, configured to obtain a hydrogen parameter of the hydrogen pipeline and a nitrogen parameter of the air pipeline, and obtain a hydrogen permeation voltage of each cell in the stack; the hydrogen parameters include an inlet hydrogen temperature and an outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure;
and a hydrogen leakage determination module 440, configured to determine, for each cell in the stack, a hydrogen leakage according to the hydrogen parameter, the nitrogen parameter, and the hydrogen crossover voltage.
Optionally, the hydrogen leakage amount determining module 440 includes:
a hydrogen permeation pressure determination unit for determining a hydrogen permeation pressure according to the hydrogen parameter and the hydrogen permeation voltage;
the water vapor pressure determining unit is used for determining a first water vapor pressure of the hydrogen pipeline according to the hydrogen parameters and determining a second water vapor pressure of the air pipeline according to the inlet nitrogen temperature and the outlet nitrogen pressure;
a hydrogen leakage amount determination unit configured to determine a hydrogen leakage amount from the outlet hydrogen pressure, the inlet nitrogen flow rate, the first steam pressure, the second steam pressure, and the hydrogen permeation pressure.
Optionally, the calculation formula of the hydrogen permeation pressure is as follows:
Figure BDA0003704955110000141
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003704955110000142
in order to obtain the hydrogen gas permeation pressure,
Figure BDA0003704955110000143
for the outlet hydrogen pressure, E is the hydrogen permeation voltage, T is the inlet hydrogen temperature, R is the ideal gas constant, and F is the Faraday constant.
Optionally, the calculation formula of the hydrogen leakage amount is as follows:
Figure BDA0003704955110000144
wherein the content of the first and second substances,
Figure BDA0003704955110000145
the leakage amount of the hydrogen gas is the leakage amount of the hydrogen gas,
Figure BDA0003704955110000146
is an inletThe flow rate of the nitrogen gas is controlled,
Figure BDA0003704955110000147
the outlet hydrogen gas pressure is the pressure of the outlet hydrogen gas,
Figure BDA0003704955110000151
is the hydrogen osmotic pressure, P w,a Is a first water vapor pressure, P w,c A second vapor pressure.
Optionally, the apparatus further comprises:
the first judgment module is used for judging whether the hydrogen leakage amount of each single cell in the galvanic pile meets a preset permeation condition or not after the hydrogen leakage amount is determined according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage;
the first processing module is used for continuing the galvanic pile test if the first processing module is used for continuing the galvanic pile test;
if not, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target cell is a preset number of cells adjacent to the first target cell;
a hydrogen leakage amount re-determination module for determining a hydrogen leakage amount of the target unit cell.
Optionally, the apparatus further comprises:
the second judgment module is used for judging whether the hydrogen leakage amount of the target single cell meets the preset permeation condition or not after the hydrogen leakage amount of the target single cell is determined;
the second processing module is used for reinstalling the target single cell to the cell stack to continue the cell stack test if the target single cell is met;
and if not, replacing the target single cell, and installing the replaced target single cell to the cell stack to continue the cell stack test.
Optionally, the water vapor pressure determining unit is configured to:
obtaining a first vapor pressure by querying a dew point temperature comparison table based on the hydrogen parameter;
a second vapor pressure is obtained by querying a dew point temperature look-up table based on the inlet nitrogen temperature and the outlet nitrogen pressure.
The single cell leakage detection device in the fuel cell stack provided by the embodiment of the invention can execute the single cell leakage detection method in the fuel cell stack provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
FIG. 5 illustrates a schematic diagram of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 5, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM)12, a Random Access Memory (RAM)13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 can perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM)12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. Processor 11 performs the various methods and processes described above, such as the single cell leak detection method in a fuel cell stack.
In some embodiments, the single cell leak detection method in a fuel cell stack may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the single cell leak detection method in a fuel cell stack described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the single cell leak detection method in the fuel cell stack by any other suitable means (e.g., by way of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the Internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for single cell leak detection in a fuel cell stack, the method comprising:
purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile;
introducing hydrogen into the hydrogen pipeline, and introducing nitrogen into the air pipeline;
acquiring hydrogen parameters of the hydrogen pipeline and nitrogen parameters of the air pipeline, and acquiring hydrogen permeation voltage of each single cell in the galvanic pile; the hydrogen parameters include an inlet hydrogen temperature and an outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure;
and determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
2. The method of claim 1, wherein determining an amount of hydrogen leakage from the hydrogen parameter, the nitrogen parameter, and the hydrogen permeation voltage comprises:
determining hydrogen permeation pressure according to the hydrogen parameters and the hydrogen permeation voltage;
determining a first vapor pressure of the hydrogen line based on the hydrogen parameter, and determining a second vapor pressure of the air line based on the inlet nitrogen temperature and the outlet nitrogen pressure;
determining a hydrogen leak amount from the outlet hydrogen pressure, the inlet nitrogen flow rate, the first water vapor pressure, the second water vapor pressure, and the hydrogen permeation pressure.
3. The method according to claim 2, wherein the calculation formula of the hydrogen permeation pressure is as follows:
Figure FDA0003704955100000011
wherein the content of the first and second substances,
Figure FDA0003704955100000012
in order to obtain the hydrogen gas permeation pressure,
Figure FDA0003704955100000013
for the outlet hydrogen pressure, E is the hydrogen permeation voltage, T is the inlet hydrogen temperature, R is the ideal gas constant, and F is the Faraday constant.
4. The method according to claim 2, wherein the calculation formula of the hydrogen gas leakage amount is as follows:
Figure FDA0003704955100000021
wherein the content of the first and second substances,
Figure FDA0003704955100000022
the leakage amount of the hydrogen gas is the leakage amount of the hydrogen gas,
Figure FDA0003704955100000023
is the flow rate of the nitrogen at the inlet,
Figure FDA0003704955100000024
the outlet hydrogen pressure is the pressure of the hydrogen gas,
Figure FDA0003704955100000025
is the hydrogen osmotic pressure, P w,a Is a first water vapor pressure, P w,c A second vapor pressure.
5. The method of claim 1, further comprising, after determining an amount of hydrogen leak based on the hydrogen parameter, the nitrogen parameter, and the hydrogen permeation voltage:
judging whether the hydrogen leakage amount of each single cell in the galvanic pile meets a preset permeation condition or not;
if yes, continuing the galvanic pile test;
if not, determining a target single cell, and detaching the target single cell from the cell stack; the target battery cells include a first target battery cell and a second target battery cell; the first target single cell is a single cell which does not meet the preset permeation condition; the second target cell is a preset number of cells adjacent to the first target cell;
and determining the hydrogen leakage amount of the target single cell.
6. A method according to claim 5, characterized in that, after determining the hydrogen leakage amount of the target cell, further comprising:
judging whether the hydrogen leakage amount of the target single cell meets the preset permeation condition or not;
if so, reinstalling the target single cell to the cell stack to continue the cell stack test;
and if not, replacing the target single cell, and installing the replaced target single cell to the cell stack to continue the cell stack test.
7. The method of claim 2, wherein determining the first water vapor pressure of the hydrogen circuit from the hydrogen parameter comprises:
obtaining a first vapor pressure by querying a dew point temperature comparison table based on the hydrogen parameter;
determining a second vapor pressure of the air line from the inlet nitrogen temperature and the outlet nitrogen pressure, comprising:
a second vapor pressure is obtained by querying a dew point temperature look-up table based on the inlet nitrogen temperature and the outlet nitrogen pressure.
8. An apparatus for detecting a single cell leak in a fuel cell stack, the apparatus comprising:
the purging module is used for purging the hydrogen pipeline and the air pipeline; the hydrogen pipeline and the air pipeline are respectively connected with the galvanic pile;
the ventilation module is used for introducing hydrogen into the hydrogen pipeline and introducing nitrogen into the air pipeline;
the parameter acquisition module is used for acquiring hydrogen parameters of the hydrogen pipeline and nitrogen parameters of the air pipeline and acquiring hydrogen permeation voltage of each single cell in the galvanic pile; the hydrogen parameters include an inlet hydrogen temperature and an outlet hydrogen pressure; the nitrogen parameters include inlet nitrogen temperature, inlet nitrogen flow rate, and outlet nitrogen pressure;
and the hydrogen leakage amount determining module is used for determining the hydrogen leakage amount according to the hydrogen parameter, the nitrogen parameter and the hydrogen permeation voltage aiming at each single cell in the galvanic pile.
9. An electronic device for single cell leak detection in a fuel cell stack, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of detecting a single cell leak in a fuel cell stack of any one of claims 1-7.
10. A computer-readable storage medium storing computer instructions for causing a processor to implement the method for detecting a single cell leak in a fuel cell stack according to any one of claims 1 to 7 when executed.
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