CN113782786B - In-situ detection method and device for hydrogen permeation current of fuel cell stack - Google Patents

In-situ detection method and device for hydrogen permeation current of fuel cell stack Download PDF

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CN113782786B
CN113782786B CN202110980758.6A CN202110980758A CN113782786B CN 113782786 B CN113782786 B CN 113782786B CN 202110980758 A CN202110980758 A CN 202110980758A CN 113782786 B CN113782786 B CN 113782786B
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hydrogen permeation
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CN113782786A (en
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梁永浩
马天才
姚乃元
杨彦博
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Tongji University
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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
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04597—Current of auxiliary devices, e.g. batteries, capacitors
    • 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
    • H01M8/04574—Current
    • H01M8/04589—Current of fuel cell stacks
    • 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
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    • 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

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Abstract

The invention relates to a fuel cell stack hydrogen permeation current in-situ detection method and a device, wherein the method comprises the following steps: connecting a cathode outlet of a proton exchange membrane fuel cell stack to be tested with a cathode inlet of a hydrogen permeation sensing cell; introducing nitrogen into the cathode connecting path, and permeating hydrogenIntroducing hydrogen into the anode of the permeation sensing battery, and measuring hydrogen permeation current i of the hydrogen permeation sensing battery in the current state S2 The method comprises the steps of carrying out a first treatment on the surface of the Introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current i of the hydrogen permeation sensing cell in the current state S3 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining hydrogen permeation current i S3 With hydrogen permeation current i S2 And the difference value is the detection result of the hydrogen permeation current of the electric pile to be detected. Compared with the prior art, the invention can effectively avoid the complexity of measuring the hydrogen permeation current of the galvanic pile and the risk of bringing potential damage to the galvanic pile when measuring the hydrogen permeation, and has the advantages of quick and convenient measuring process, wide applicability and accurate and visual measuring result.

Description

In-situ detection method and device for hydrogen permeation current of fuel cell stack
Technical Field
The invention relates to the technical field of hydrogen permeation current measurement of proton exchange membrane fuel cell stacks, in particular to a fuel cell stack hydrogen permeation current in-situ detection method and device.
Background
The membrane electrode of the proton exchange membrane fuel cell (PEMFC for short) consists of a gas diffusion layer, a catalyst layer and a proton exchange membrane. The proton exchange membrane functions include isolating hydrogen and oxygen, blocking electrons and transferring protons. Protons are transferred from the anode to the cathode through the proton exchange membrane, forming a circuit, generating an electrical current. However, due to the concentration gradient of hydrogen on both sides of the proton exchange membrane and its own drawbacks, a small amount of hydrogen permeates from the anode to the cathode through the proton exchange membrane, resulting in a decrease in electrons flowing through the outside, resulting in a decrease in Open Circuit Voltage (OCV). Meanwhile, the permeation of hydrogen enables the hydrogen and the oxygen to directly react on the cathode catalyst, so that the aging of the membrane electrode is accelerated, and the degradation of the battery is further caused. Therefore, the hydrogen permeation quantity becomes an important index for measuring the attenuation degree of the proton exchange membrane.
When a voltage is applied to the two poles of the fuel cell under the conditions that hydrogen is introduced into the anode and nitrogen is introduced into the cathode, hydrogen permeated from the anode to the cathode is oxidized into protons and electrons, the electrons move to the anode through an external circuit, the protons move to the anode through a membrane, a stable current is observed in appearance, and the current is called hydrogen permeation current, and the hydrogen permeation current is a stable value under the condition that the hydrogen permeation flux is unchanged. Hydrogen permeation current is therefore commonly used to characterize the hydrogen permeation of proton exchange membrane fuel cells.
The existing hydrogen permeation current measurement method for the proton exchange membrane fuel cell stack comprises the following steps: constant current charging and mass spectrometer detection. However, the constant current charging method needs to integrate the collected data for a plurality of times, so that the problems of high complexity of data sampling and processing exist, and when the data is charged into the pile, if nitrogen is impure, the risk of damaging internal components of the pile exists; the mass spectrometer detection method cannot realize in-situ detection, and the test cost is high.
Disclosure of Invention
The invention aims to overcome the defects that the constant current charging method in the prior art has high data sampling and processing complexity and has the risk of damaging internal components of a fuel cell stack, the mass spectrometer detection method cannot realize in-situ detection, and the test cost is high.
After research, the invention discovers that when the cathode outlet of the to-be-detected electric pile and the cathode inlet of the hydrogen permeation sensing battery are connected with each other, nitrogen is introduced into the cathode connection path, and hydrogen is introduced into the anode of the to-be-detected electric pile, if the hydrogen permeation current of the hydrogen permeation sensing battery is measured at the moment, the measured hydrogen permeation current consists of two aspects, namely, the hydrogen permeation current generated by the hydrogen permeation sensing battery and the hydrogen permeation current generated by the hydrogen permeation from the anode to the cathode in the to-be-detected proton exchange membrane fuel electric pile is equivalent to the hydrogen permeation current of the to-be-detected proton exchange membrane fuel electric pile. Therefore, the hydrogen permeation current of the proton exchange membrane fuel cell stack to be measured can be calculated by measuring the hydrogen permeation current of the hydrogen permeation sensing cell in two states.
The aim of the invention can be achieved by the following technical scheme:
the in-situ detection method of hydrogen permeation current of fuel cell pile includes the following steps:
s1: acquiring a proton exchange membrane fuel cell stack to be detected and a hydrogen permeation sensing battery, and connecting a cathode outlet of the proton exchange membrane fuel cell stack to be detected with a cathode inlet of the hydrogen permeation sensing battery to form a cathode connecting path;
s2: introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the hydrogen permeation sensing battery, and measuring the hydrogen permeation current i of the hydrogen permeation sensing battery in the current state S2 ；
S3: introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current i of the hydrogen permeation sensing cell under the current state S3 ；
S4: acquiring hydrogen permeation current i of the hydrogen permeation sensing battery in the step S3 S3 And the hydrogen permeation current i of the hydrogen permeation sensing battery in the step S2 S2 And the difference value is the detection result of the hydrogen permeation current of the electric pile to be detected.
In step S2, saturated and humidified nitrogen is introduced into the connection path between the stack to be tested and the cathode of the hydrogen permeation sensing battery, and saturated and humidified hydrogen is introduced into the anode of the hydrogen permeation sensing battery.
Further, in step S2, the hydrogen permeation current of the hydrogen permeation sensing battery is measured by a step potential method.
In step S3, saturated and humidified nitrogen is introduced into the connection path between the stack to be tested and the cathode of the hydrogen permeation sensing cell, saturated and humidified hydrogen is introduced into the anode of the hydrogen permeation sensing cell, and equal amount of saturated and humidified hydrogen is introduced into the anode of the proton exchange membrane fuel cell stack to be tested.
Further, in step S3, the hydrogen permeation current of the reference proton exchange membrane fuel cell is measured by a step potential method.
The invention also provides an in-situ detection device for hydrogen permeation current of the fuel cell stack, which is used for measuring the hydrogen permeation current of the proton exchange membrane fuel cell stack to be measured and comprises the following steps:
the cathode of the hydrogen permeation sensing battery is connected with the cathode of the proton exchange membrane fuel cell stack to be tested to form a cathode connecting path;
the anode and the cathode of the constant voltage source are respectively connected with the anode and the cathode of the hydrogen permeation sensing battery and are used for applying constant voltages with different magnitudes to the hydrogen permeation sensing battery;
the signal acquisition unit is connected with the constant voltage source and is used for acquiring a constant voltage value applied by the constant voltage source to the hydrogen permeation sensing battery and a steady-state output current value of the constant voltage source under different constant voltage values to obtain N groups (N > 1) of voltage and current signals, wherein N is preset acquisition times;
the data processor is in communication connection with the signal acquisition unit and is used for carrying out linear fitting on N groups of voltage and current signals of the signal acquisition unit to obtain a value of hydrogen permeation current;
the use process of the fuel cell stack hydrogen permeation current in-situ detection device comprises the following steps:
introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the hydrogen permeation sensing battery, and measuring the hydrogen permeation current i of the hydrogen permeation sensing battery in the current state by a data processor S2 ；
Introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current i of the hydrogen permeation sensing cell under the current state by a data processor S3 ；
Obtaining hydrogen permeation current i S3 With hydrogen permeation current i S2 And the difference value is the detection result of the hydrogen permeation current of the electric pile to be detected.
Further, the in-situ detection device for hydrogen permeation current of the fuel cell stack further comprises a nitrogen cylinder and a hydrogen cylinder, wherein the nitrogen cylinder is connected into the cathode connecting path, the hydrogen cylinder is respectively connected with the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and a switch is arranged in the connecting path between the hydrogen cylinder and the anode of the proton exchange membrane fuel cell stack to be detected.
Further, the data processor is a computer.
Further, the data processor is communicatively coupled to the constant voltage source to change the constant voltage value of the constant voltage source by sending commands to the constant voltage source.
Further, the data processor is in communication connection with the constant voltage source and the signal acquisition unit through the serial communication module.
Compared with the prior art, the invention has the following advantages:
(1) And connecting a cathode outlet of the proton exchange membrane fuel cell stack to be detected with a cathode inlet of the hydrogen permeation sensing battery, and calculating the hydrogen permeation current of the proton exchange membrane fuel cell stack to be detected by utilizing the hydrogen permeation current measured by the hydrogen permeation sensing battery in two states when the anode inlet of the proton exchange membrane fuel cell stack to be detected is closed and opened. The hydrogen permeation current measurement of the proton exchange membrane fuel cell stack is transferred to the hydrogen permeation current measurement of the hydrogen permeation sensing cell, so that the complexity of the hydrogen permeation current measurement of the stack can be effectively avoided, the risk of potential damage to the stack during the hydrogen permeation measurement can be effectively avoided, the measurement process is quick and convenient, the applicability is wide, and the measurement result is accurate and visual.
(2) The device and the method can measure the hydrogen permeation current of the fuel cell stack so as to guide the determination of the rated working condition of the proton exchange membrane fuel cell stack under low load.
(3) The device and the method can measure the hydrogen permeation current of the fuel cell stack, and provide a new solution for the evaluation of the merits of the membrane electrode proton exchange membrane body, the measurement of the attenuation speed of the membrane electrode proton exchange membrane and the like.
Drawings
FIG. 1 is a flow chart of a method for in situ detection of hydrogen permeation current of a fuel cell stack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an in-situ detection device for hydrogen permeation current of a fuel cell stack according to an embodiment;
FIG. 3 is a graph showing the variation of the output current of the constant voltage source with time according to the embodiment;
FIG. 4 is a schematic representation of a fitting of the hydrogen permeation sensing cell voltage current signal with the valve closed in an example;
FIG. 5 is a schematic representation of a fitting of the voltage and current signals of a hydrogen permeation sensor cell with the valve open in an example;
reference numerals: 1. the device comprises a proton exchange membrane fuel cell stack to be tested, a hydrogen permeation sensing cell, a hydrogen cylinder, a nitrogen cylinder, a constant voltage source, a current sensor, a signal acquisition unit, a data processor and a data processor, wherein the proton exchange membrane fuel cell stack to be tested comprises a proton exchange membrane fuel cell stack to be tested, a hydrogen permeation sensing cell, a hydrogen cylinder, a constant voltage source, a current sensor and a signal acquisition unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The in-situ detection method of hydrogen permeation current of fuel cell pile as shown in figure 1 includes the following steps:
s1, acquiring a proton exchange membrane fuel cell stack to be detected and a hydrogen permeation sensing battery, and connecting a cathode outlet of the proton exchange membrane fuel cell stack with a cathode inlet of the hydrogen permeation sensing battery to form a cathode connecting path;
s2, introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the hydrogen permeation sensing battery, measuring the hydrogen permeation current of the hydrogen permeation sensing battery in the current state, and recording as i S2 。
S3, introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, measuring the hydrogen permeation current of the hydrogen permeation sensing cell in the current state, and recording as i S3 。
S4, the hydrogen permeation current of the electric pile to be detected is equal to the hydrogen permeation current i of the hydrogen permeation sensing battery measured in the step S3 S3 And the hydrogen permeation current i of the hydrogen permeation sensing battery measured in step S2 S2 The difference between i stack ＝i s3 -i S2 。
A fuel cell stack hydrogen permeation current in situ detection device, as shown in fig. 2, comprising:
the cathode inlet of the hydrogen permeation sensing battery is connected with the cathode outlet of the proton exchange membrane fuel cell stack to be tested;
the anode and the cathode of the constant voltage source are respectively connected with the anode and the cathode of the hydrogen permeation sensing battery and are used for applying constant voltages with different magnitudes to the hydrogen permeation sensing battery;
the signal acquisition unit is connected with the constant voltage source and is used for acquiring a constant voltage value applied by the constant voltage source to the hydrogen permeation sensing battery and a steady-state output current value of the constant voltage source under different constant voltage values to obtain N groups (N > 1) of voltage and current signals, wherein N is preset acquisition times;
the data processor is in communication connection with the signal acquisition unit and is used for performing linear fitting on N groups of voltage and current signals of the signal acquisition unit to obtain hydrogen permeation current i of the hydrogen permeation sensing battery in two states S2 I S3 Is a value of (2).
When the cathode outlet of the proton exchange membrane fuel cell stack 1 to be measured is connected with the cathode inlet of the hydrogen permeation sensing cell 2, nitrogen is introduced into the connection path, and an equal amount of hydrogen is introduced into the anode, the hydrogen permeation current i of the hydrogen permeation sensing cell 2 at the moment is measured S3 . The measured hydrogen permeation current consists of two aspects, one is the hydrogen permeation current i generated by the hydrogen permeation sensing cell 2 itself S2 Secondly, the hydrogen permeation current generated by hydrogen permeated from anode to cathode in the proton exchange membrane fuel cell stack 1 to be detected is equivalent to the hydrogen permeation current i of the proton exchange membrane fuel cell stack 1 to be detected stack . Thus, i stack ＝i S3 -i S2 。
In this embodiment, nitrogen and hydrogen are provided by a nitrogen cylinder 4 and a hydrogen cylinder 3 respectively, the nitrogen cylinder 4 is connected to a cathode connection path, in this embodiment, the cathode of the proton exchange membrane fuel cell stack 1 to be tested is connected, the hydrogen cylinder 3 is connected to the anode of the proton exchange membrane fuel cell stack 1 to be tested and the anode of the hydrogen permeation sensing cell 2 respectively, and a switch is arranged in the connection path between the hydrogen cylinder 3 and the anode of the proton exchange membrane fuel cell stack 1 to be tested.
In addition, in the embodiment, the proton exchange membrane fuel cell stack 1 to be tested is a stack consisting of 4 sections of 227cm 2 A galvanic pile composed of single cells with active area, a hydrogen permeation sensing battery 2 of 25cm 2 As shown in fig. 2, the cathode outlet of the proton exchange membrane fuel cell stack 1 to be tested is connected with the cathode inlet of the hydrogen permeation sensing cell 2, and then the anode and the cathode of the constant voltage source 5 are connected with the anode end plate and the cathode end plate of the hydrogen permeation sensing cell 2; the current sensor 6 is used for collecting the output current of the constant voltage source 5, and the current value signal output port of the current sensor 6 is connected with an analog quantity signal input port of the signal collecting unit 7; the voltage value signal output port of the constant voltage source 5 is directly connected with the other analog quantity signal input port of the signal acquisition unit 7; in this embodiment, the data processor 8 is a computer, and finally, the serial data transmission port of the signal acquisition unit 7 is connected to the serial data transmission port of the data processor 8.
And closing an anode inlet valve of the proton exchange membrane fuel cell stack 1 to be detected, introducing 1L/min saturated and humidified hydrogen to the anode of the hydrogen permeation sensing cell 2, and introducing 1.2L/min saturated and humidified nitrogen to the cathode connection path, wherein the temperature of the gas and the temperature of the reference proton exchange membrane fuel cell are both 80 ℃, and the back pressure of the hydrogen and the nitrogen is both 1bar.
The constant voltage source 5 is used for applying a constant voltage of 0.4V to the hydrogen permeation sensing battery 2, as shown in fig. 3, the change of the output current of the constant voltage source 5 along with time can be observed, the steady-state output current value of the constant voltage source 5 is recorded after the output current of the constant voltage source 5 is stable, and the current value acquired by the signal acquisition unit 7 in the embodiment is 0.07902A, so that a group of voltage current signals (0.4V, 0.07902A) are obtained;
according to a preset step length of 250mV, increasing the constant voltage applied by the constant voltage source 5 to the hydrogen permeation sensing battery 2 by 250mV, observing the output current of the constant voltage source 5 again, and recording the steady-state output current value of the constant voltage source 5 after the output current of the constant voltage source 5 is stable to obtain a group of voltage current signals (0.425V, 0.07949A);
taking the constant voltage value as an independent variable, taking the steady-state output current value of the constant voltage source 5 as a dependent variable, and performing linear fitting on the collected multiple groups of voltage current signals to obtain a fitting straight line l, as shown in fig. 4, according to the formula:
Figure GDA0004204825040000061
hydrogen permeation current
Figure GDA0004204825040000062
The value of (2) is equal to the intercept value of the fitting straight line l on the y axis, and the hydrogen permeation current is calculated
Figure GDA0004204825040000063
0.0708A.
Opening an anode inlet valve of the proton exchange membrane fuel cell stack 1 to be detected, introducing 1L/min saturated and humidified hydrogen to the anode of the hydrogen permeation sensing cell 2, introducing 1.2L/min saturated and humidified nitrogen to a cathode connecting channel, wherein the temperature of the gas and the temperature of the reference proton exchange membrane fuel cell are both 80 ℃, and the back pressure of the hydrogen and the nitrogen is both 1bar.
Applying a constant voltage of 0.4V to a reference proton exchange membrane fuel cell by using a constant voltage source 5, and recording a steady-state output current value of the constant voltage source 5 after the output current of the constant voltage source 5 is stable, wherein the current value acquired by a signal acquisition unit 7 in the embodiment is 1.29198A, so as to obtain a group of voltage and current signals (0.4V, 1.2998A);
according to a preset step length of 250mV, increasing the constant voltage applied by the constant voltage source 5 to the reference proton exchange membrane fuel cell by 250mV, observing the output current of the constant voltage source 5 again, and recording the steady-state output current value of the constant voltage source 5 after the output current of the constant voltage source 5 is stable to obtain a group of voltage current signals (0.425V, 1.29255A);
taking the constant voltage value as an independent variable, taking the steady-state output current value of the constant voltage source 5 as a dependent variable, and performing linear fitting on the collected multiple groups of voltage current signals to obtain a fitting straight line l, as shown in fig. 5, according to the formula:
Figure GDA0004204825040000071
hydrogen permeation current
Figure GDA0004204825040000072
The value of (2) is equal to the intercept value of the fitting straight line l on the y axis, and the hydrogen permeation current is calculated
Figure GDA0004204825040000073
1.2839a.
According to the formula: i.e stack ＝i S3 -i S2 Calculating to obtain hydrogen permeation current i of proton exchange membrane fuel cell stack 1 to be detected stack ＝1.2131A。
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (1)

1. An in-situ hydrogen permeation current detection device for a fuel cell stack, which is used for measuring the hydrogen permeation current of a proton exchange membrane fuel cell stack to be detected, and is characterized by comprising the following components:
the cathode of the hydrogen permeation sensing battery is connected with the cathode of the proton exchange membrane fuel cell stack to be tested to form a cathode connecting path;
the anode and the cathode of the constant voltage source are respectively connected with the anode and the cathode of the hydrogen permeation sensing battery and are used for applying constant voltages with different magnitudes to the hydrogen permeation sensing battery;
the signal acquisition unit is connected with the constant voltage source and is used for acquiring a constant voltage value applied by the constant voltage source to the hydrogen permeation sensing battery and a steady-state output current value of the constant voltage source under different constant voltage values to obtain N groups of voltage and current signals, wherein N is preset acquisition times, and N is more than 1;
the data processor is in communication connection with the signal acquisition unit and is used for carrying out linear fitting on N groups of voltage and current signals of the signal acquisition unit to obtain a value of hydrogen permeation current;
the nitrogen cylinder and the hydrogen cylinder are connected into the cathode connecting path, the hydrogen cylinder is respectively connected with the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing battery, and a switch is arranged in the connecting path of the hydrogen cylinder and the anode of the proton exchange membrane fuel cell stack to be detected;
the data processor is a computer;
the data processor is in communication connection with the constant voltage source and changes the constant voltage value of the constant voltage source by sending a command to the constant voltage source;
the data processor is in communication connection with the constant voltage source and the signal acquisition unit through the serial port communication module;
the use process of the fuel cell stack hydrogen permeation current in-situ detection device comprises the following steps:
s1: acquiring a proton exchange membrane fuel cell stack to be detected and a hydrogen permeation sensing battery, and connecting a cathode outlet of the proton exchange membrane fuel cell stack to be detected with a cathode inlet of the hydrogen permeation sensing battery to form a cathode connecting path;
s2: introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the hydrogen permeation sensing battery, and measuring the hydrogen permeation current i of the hydrogen permeation sensing battery in the current state S2 ；
S3: introducing nitrogen into the cathode connection path, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current i of the hydrogen permeation sensing cell under the current state S3 ；
S4: acquiring hydrogen permeation current i of the hydrogen permeation sensing battery in the step S3 S3 And the hydrogen permeation current i of the hydrogen permeation sensing battery in the step S2 S2 The difference value is the detection result of the hydrogen permeation current of the electric pile to be detected;
in the step S2, saturated and humidified nitrogen is introduced into a cathode connecting passage of the to-be-detected electric pile and the hydrogen permeation sensing battery, and saturated and humidified hydrogen is introduced into an anode of the hydrogen permeation sensing battery;
in the step S2, hydrogen is not introduced into the anode of the proton exchange membrane fuel cell stack to be tested;
in the step S2, measuring the hydrogen permeation current of the hydrogen permeation sensing battery by adopting a step potential method;
in step S3, saturated and humidified nitrogen is introduced into a cathode connection path of the to-be-detected electric pile and the hydrogen permeation sensing battery, saturated and humidified hydrogen is introduced into an anode of the hydrogen permeation sensing battery, and equal amount of saturated and humidified hydrogen is introduced into an anode of the to-be-detected proton exchange membrane fuel cell electric pile.
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