CN113130945A - Fuel cell stack performance recovery method and system - Google Patents
Fuel cell stack performance recovery method and system Download PDFInfo
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- CN113130945A CN113130945A CN202110303812.3A CN202110303812A CN113130945A CN 113130945 A CN113130945 A CN 113130945A CN 202110303812 A CN202110303812 A CN 202110303812A CN 113130945 A CN113130945 A CN 113130945A
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- 239000000446 fuel Substances 0.000 title claims abstract description 189
- 238000011084 recovery Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
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- 239000000126 substance Substances 0.000 claims description 5
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- 230000006872 improvement Effects 0.000 description 8
- 235000003642 hunger Nutrition 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000037351 starvation Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
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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
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04238—Depolarisation
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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
- H01M8/04544—Voltage
- H01M8/04552—Voltage of the individual fuel cell
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a method and a system for recovering the performance of a fuel cell stack, which comprises the following steps: setting internal circulation supply of cathode air of the fuel cell stack, and detecting the voltage of the single cell output by the fuel cell stack; the method comprises the following steps that a fuel cell stack is in a performance recovery working condition, internal circulation supply of cathode air of the fuel cell stack is started, and when the voltage of a single cell is detected to be lower than a first threshold voltage, the fuel cell stack is switched to a normal operation working condition; and when the voltage of the single cell is detected to be higher than the voltage of the second threshold value, the fuel cell stack is switched to the performance recovery working condition. The invention can quickly and efficiently recover the performance of the fuel cell stack, and simultaneously avoid the problems of irreversible attenuation caused by the reverse polarity of a single cell or a local area of the fuel cell.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a method and a system for recovering the performance of a fuel cell stack.
Background
At present, the membrane electrode catalyst of the commercial proton exchange membrane fuel cell mainly uses a Pt/C catalyst, when the fuel cell is parked for a long time or runs at low power, an oxide film is easily formed on the surface of the catalyst and wraps the surface of metal Pt, so that the catalytic activity of the catalyst is reduced, and the output performance of a fuel cell stack is attenuated. The existing fuel cell operation control strategy adopts a method that the supply of an oxidant of the fuel cell is reduced or stopped when a current cell stack operates, the cathode counter electrode overpotential is increased, and the output voltage of the fuel cell is reduced, so that an oxide coating layer on the surface of a catalyst can be reduced, the effect of activating the catalyst is achieved, and the performance of the fuel cell is improved.
However, because the single cell inside the fuel cell stack has performance differences, including the difference in hydrogen permeability of the proton membrane of the single cell, the difference in catalytic activity of the membrane electrode, the difference in air atmosphere environment between the middle position and the two sides of the single cell, and the difference in liquid water content inside the single cell, when the fuel cell is operated to reduce or stop the supply of the oxidant, the phenomena of fast decrease of one or more output voltages, unbalanced reaction due to large difference in oxygen deficiency of different reaction regions of the single cell, or local water blockage of the single membrane electrode, etc., may occur, which may cause the occurrence of reverse polarity in the single cell or local position. Meanwhile, when the fuel cell stack recovers the supply of the oxidant, a certain time difference still exists from the beginning of the supply of the oxidant to the filling of the cathode cavity of the whole fuel cell stack, which is related to the recovery of the air supply flow and the number of the fuel cell stack, and can also cause the reverse pole of a single cell or a local position. The reverse pole of the single fuel cell can cause the irreversible attenuation of the electrode catalyst carrier.
Disclosure of Invention
The invention aims to provide a method and a system for recovering the performance of a fuel cell stack, which can be used for rapidly and efficiently recovering the performance of the fuel cell stack and simultaneously avoiding the problems of irreversible attenuation caused by reverse polarity of a single cell or a local area of the fuel cell.
In order to solve the above technical problem, the present invention provides a method for recovering the performance of a fuel cell stack, comprising the steps of:
setting internal circulation supply of cathode air of the fuel cell stack, and detecting the voltage of the single cell output by the fuel cell stack;
the method comprises the following steps that a fuel cell stack is in a performance recovery working condition, internal circulation supply of cathode air of the fuel cell stack is started, and when the voltage of a single cell is detected to be lower than a first threshold voltage, the fuel cell stack is switched to a normal operation working condition;
and when the voltage of the single cell is detected to be higher than the voltage of the second threshold value, the fuel cell stack is switched to the performance recovery working condition.
As a further improvement of the invention, when the fuel cell stack is in a performance recovery working condition, continuously polling the voltage of the single cell of the fuel cell stack to obtain the lowest voltage or the average voltage of the single cell of the fuel cell stack, and when the lowest voltage or the average voltage of the single cell of the fuel cell stack is detected to be lower than a first threshold value, closing the internal circulation supply of the cathode air of the fuel cell stack to enable the fuel cell stack to recover the normal operation working condition;
when the fuel cell stack is in a normal operation condition, continuously polling the voltage of the single fuel cell of the fuel cell stack to obtain the lowest voltage or the average voltage of the single cell of the fuel cell stack, and when the lowest voltage or the average voltage of the single cell of the fuel cell stack is detected to be higher than a second threshold value, starting internal circulation supply of cathode air of the fuel cell stack to enable the fuel cell stack to be in a performance recovery condition.
As a further improvement of the invention, when the fuel cell stack is in the performance recovery working condition, the internal circulation supply of the cathode air of the fuel cell stack is started, the circulation air flow is regulated, and the ratio of the air flow entering the fuel cell stack from the air inlet pipeline to the circulation air flow is controlled.
As a further improvement of the invention, when the fuel cell stack is in a performance recovery working condition, the output current of the fuel cell stack is regulated, so that the single voltage of the fuel cell continuously and stably changes.
A fuel cell stack performance recovery system comprises a fuel cell stack, an air supply pipeline, a voltage detection module and a controller; wherein:
the air supply pipeline is connected with the cathode of the fuel cell stack and the controller and is used for supplying air and internally circulating cathode air to the cathode of the fuel cell stack;
the voltage detection module is connected with the fuel cell stack and the controller and is used for detecting the voltage of the single cell output by the fuel cell stack and feeding back the voltage value to the controller;
the controller is used for determining whether the output working condition of the fuel cell stack opens the air supply pipeline to supply cathode air in an internal circulation mode and switch the operation working condition:
determining that the fuel cell stack is in a performance recovery working condition, controlling the air supply pipeline to start internal circulation supply of cathode air, and switching the fuel cell stack to a normal operation working condition when the received voltage of the single cell is lower than a first threshold voltage;
and determining that the fuel cell stack is in a normal operation condition, controlling the air supply pipeline to close internal circulation supply of cathode air, and switching the fuel cell stack to a performance recovery condition when the received single cell voltage is higher than a second threshold voltage.
As a further improvement of the present invention, the air supply line includes an air inlet line and a circulation line which are communicated with the external environment, the air inlet line is sequentially provided with a chemical filter, an air compressor, an intercooler and a humidifier which are communicated with each other, the humidifier is connected with the fuel cell stack, and the circulation line is respectively connected with an air outlet end of the humidifier and an air inlet end of the air compressor.
As a further improvement of the present invention, the circulation pipeline includes an empty pipeline and an empty return pipeline which are communicated with an external environment, the empty pipeline is provided with a three-way valve, one end of the three-way valve is connected to the humidifier through the empty pipeline, one end of the three-way valve is connected to the air inlet end of the air compressor through the empty return pipeline, and the controller is connected to the three-way valve and is used for controlling the opening and closing of the three-way valve.
As a further improvement of the present invention, the controller is connected to the three-way valve and is also used for adjusting the opening degree of the three-way valve.
As a further improvement of the invention, the controller is respectively connected with the air compressor and the three-way valve and is also used for adjusting the rotating speed of the air compressor and the opening degree of the three-way valve to adjust the flow rate of the inlet air and the oxygen content in the air.
As a further improvement of the invention, the controller is connected with the fuel cell stack and is also used for determining the output working condition of the fuel cell stack, including the output current regulation and the fuel cell auxiliary system operation condition.
The invention has the beneficial effects that: when the fuel cell stack is in a performance recovery working condition, the internal circulation supply of cathode air is started, so that the oxygen content of the cathode side is reduced, the electric stack is in an oxygen starvation state for a short time, the proton precipitation reaction of a cathode catalyst on the cathode side is facilitated under the oxygen starvation condition, the catalyst is exposed in a reducing atmosphere, the reduction reaction of an oxide layer on the surface of the catalyst is realized, the safe and efficient performance recovery condition of the fuel cell stack is provided, the output working condition of the cell is timely switched through the voltage detection threshold judgment of the single cell, and the normal operation state of a system is ensured; most of air is provided by tail exhaust air circulation in the process of recovering the performance of the fuel cell stack, so that the air flow can be improved, the oxygen content is reduced at the same time, and the oxygen starvation of the cathode side is caused.
Drawings
FIG. 1 is a schematic diagram of a preferred mode of the first embodiment of the present invention;
FIG. 2 is a schematic system structure diagram of a preferred mode of the second embodiment of the present invention;
FIG. 3 is a schematic diagram of a method in a preferred mode of a third embodiment of the invention;
the reference numbers in the figures illustrate: 1. air inlet pipeline, 2, chemical filter, 3, air compressor, 4, intercooler, 5, humidifier, 6, fuel cell stack, 7, air outlet pipeline, 8, three-way valve, 9, air return pipeline.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example one
The embodiment of the invention provides a method for recovering the performance of a fuel cell stack, which comprises the following steps:
setting internal circulation supply of cathode air of the fuel cell stack, and detecting the voltage of the single cell output by the fuel cell stack;
the method comprises the following steps that a fuel cell stack is in a performance recovery working condition, internal circulation supply of cathode air of the fuel cell stack is started, and when the voltage of a single cell is detected to be lower than a first threshold voltage, the fuel cell stack is switched to a normal operation working condition;
and when the voltage of the single cell is detected to be higher than the voltage of the second threshold value, the fuel cell stack is switched to the performance recovery working condition.
Specifically, when the fuel cell stack is in a performance recovery working condition control strategy, the oxygen content of the cathode side of the fuel cell stack is reduced, the stack is in an oxygen starvation state for a short time, the proton precipitation reaction of a cathode catalyst on the cathode side under the oxygen starvation condition is facilitated, the catalyst is exposed in a reducing atmosphere, a Pt surface oxidation layer is subjected to a reduction reaction, the performance of the fuel cell stack is recovered according to the removal of an oxidation film, and when the lowest voltage or the average voltage of single cells of the fuel cell stack is detected to be lower than a first threshold value, the internal circulation supply of cathode air of the fuel cell stack is closed, so that the normal operation working condition of the fuel cell stack is.
Referring to fig. 1, when the fuel cell stack is in a performance recovery condition, detecting the single cells of the fuel cell stack continuously, and when detecting that the minimum voltage of the single cells of the fuel cell stack is lower than a first threshold value, closing internal circulation supply of cathode air of the fuel cell stack to enable the fuel cell stack to recover a normal operation condition; when the fuel cell stack is in a normal operation condition, the single cells of the fuel cell stack are continuously detected, and when the lowest voltage or the average voltage of the single cells of the fuel cell stack is detected to be higher than a second threshold value, internal circulation supply of cathode air of the fuel cell stack is started, so that the fuel cell stack is in a performance recovery condition.
The first threshold voltage value range of the fuel cell stack in the embodiment is 0-0.2V; the value range of the second threshold voltage is 0.8-1.0V; however, the first threshold voltage and the second threshold voltage may be different from the above ranges for different types of fuel cell stacks, rather than fixed, determined values.
Example two
The second embodiment of the invention provides a fuel cell stack performance recovery system, which comprises a fuel cell stack, an air supply pipeline, a voltage detection module and a controller, wherein the controller is used for controlling the fuel cell stack; wherein:
the air supply pipeline is connected with the cathode of the fuel cell stack and the controller and is used for supplying air and internally circulating cathode air to the cathode of the fuel cell stack;
the voltage detection module is connected with the fuel cell stack and the controller and is used for detecting the voltage of the single cell output by the fuel cell stack and feeding back the voltage value to the controller;
the controller is used for determining whether the output working condition of the fuel cell stack opens the air supply pipeline to perform internal circulation supply of cathode air to perform operation working condition switching:
determining that the fuel cell stack is in a performance recovery working condition, controlling the air supply pipeline to start internal circulation supply of cathode air, and switching the fuel cell stack to a normal operation working condition when the received voltage of the single cell is lower than a first threshold voltage;
and determining that the fuel cell stack is in a normal operation condition, controlling the air supply pipeline to close internal circulation supply of cathode air, and switching the fuel cell stack to a performance recovery condition when the received single cell voltage is higher than a second threshold voltage.
Referring to fig. 2, the air supply line includes an air inlet line 1 and a circulation line, the air inlet line 1 is sequentially provided with a chemical filter 2, an air compressor 3, an intercooler 4 and a humidifier 5, the chemical filter 2, the air compressor 3, the intercooler 4 and the humidifier 5 are communicated with each other, the humidifier 5 is connected to the fuel cell stack 6 in a replaceable manner, and the circulation line is respectively connected to an air outlet end of the humidifier 5 and an air inlet end of the air compressor 3.
Circulation line includes and goes out pipeline 7 and empty return line 9 with the communicating vacation of external environment, is equipped with three-way valve 8 on vacation pipeline 7, and humidifier 5 is connected through vacation pipeline 7 to three-way valve 8 one end, and three-way valve 8 one end is through the inlet end that empty return line 9 connects air compressor machine 3, and three-way valve 8 is connected to the controller for controlling opening and shutting of three-way valve 8.
Specifically, the voltage detection module selects a CVM detection module (cell voltage monitor) for detecting the cell voltage of the fuel cell, and feeds back the cell voltage value detected by the CVM detection module to the fuel cell control system to control the output condition of the fuel cell stack 6; the fuel cell controller is used for receiving the monomer voltage value fed back by the CVM detection module, determining whether to execute a performance system of the fuel cell stack 6 according to the monomer voltage of the fuel cell stack 6, and responding to the determination of whether to execute the opening and closing of an air loop valve body so as to remove oxide on the surface of a membrane electrode catalyst layer Pt; meanwhile, the fuel cell controller is also used for determining the output working conditions of the fuel cell stack 6, including the output current and the operation condition of the fuel cell auxiliary system, and regulating the output current of the fuel cell stack 6 to ensure that the single voltage of the fuel cell is continuously and stably varied in load.
Specifically, when the fuel cell CVM detection module detects that the voltage of a single fuel cell is lower than a first threshold voltage, the operation condition of the fuel cell is recovered to the normal operation condition; and when the CVM detection module of the fuel cell detects that the voltage of the single fuel cell of the fuel cell is higher than the voltage of the second threshold value, the operating condition of the fuel cell implements the condition of a performance recovery control strategy.
EXAMPLE III
Referring to fig. 2 and 3, when the fuel cell system executes the performance recovery strategy, the air supply system opens the air tail circulation valve, a three-way valve 8 is selected here, so that tail air enters the electric pile again from the air compressor 3, the oxygen content of air inside the electric pile is reduced, the system self-checking unit detects the voltage of the single cell output by the electric pile, as the reaction continues, the oxygen content of cathode air of the fuel cell pile 6 is further reduced to form oxygen starvation, anode hydrogen "pumps" anode hydrogen into the cathode through a hydrogen pump, so as to remove an oxidation film formed on the surface of cathode catalytic platinum, and the performance of the fuel cell pile 6 is recovered according to the removal of the oxidation film. The method comprises the steps of detecting the voltage value of a single cell output by a stack, controlling the reaction time of a hydrogen pump of a system, when detecting that the voltage of the single cell of the fuel cell stack 6 is lower than a first threshold value, disconnecting air tail exhaust circulation supply by the fuel cell system, and recovering a normal operation mode, when detecting that the voltage of the single cell of the fuel cell stack 6 is higher than a second threshold value, opening an air tail exhaust circulation valve by the fuel cell system, enabling the air inlet of the stack to flow into the stack from the tail exhaust air through a circulation pipeline, enabling only a small part of air to enter the stack from an inlet of an air inlet pipeline, controlling the opening of a three-way valve of the air circulation pipeline to control the air flow of the air inlet pipeline, enabling the oxygen content of the air inside the stack to be gradually reduced, so.
Specifically, when the fuel cell stack 6 is in the performance recovery control strategy state, the opening of the three-way valve 8 is adjusted, so that part or all of exhaust air of the fuel cell stack 6 flows through the air return pipeline 9 by the three-way valve 8 and is pumped back by the air compressor 3 to flow into the electric stack again; wherein, the circulating air flow is adjusted by controlling the opening degree of the three-way valve 8, and the ratio of the air flow entering the fuel cell stack 6 from the air inlet pipeline 1 to the circulating air flow is adjusted; the rotating speed of the air compressor 3 and the opening of the three-way valve 8 are adjusted through a fuel cell controller to adjust the flow rate of the entering pile air and the oxygen content in the air.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A method of recovering performance of a fuel cell stack, characterized by: the method comprises the following steps:
setting internal circulation supply of cathode air of the fuel cell stack, and detecting the voltage of the single cell output by the fuel cell stack;
the method comprises the following steps that a fuel cell stack is in a performance recovery working condition, internal circulation supply of cathode air of the fuel cell stack is started, and when the voltage of a single cell is detected to be lower than a first threshold voltage, the fuel cell stack is switched to a normal operation working condition;
and when the voltage of the single cell is detected to be higher than the voltage of the second threshold value, the fuel cell stack is switched to the performance recovery working condition.
2. A fuel cell stack performance recovery method as defined in claim 1, wherein: when the fuel cell stack is in a performance recovery working condition, continuously inspecting the voltage of a single cell of the fuel cell stack to obtain the lowest voltage or the average voltage of the single cell of the fuel cell stack, and when the lowest voltage or the average voltage of the single cell of the fuel cell stack is detected to be lower than a first threshold value, closing the internal circulation supply of the cathode air of the fuel cell stack to enable the fuel cell stack to recover the normal operation working condition;
when the fuel cell stack is in a normal operation condition, continuously polling the voltage of the single cell of the fuel cell stack to obtain the lowest single cell voltage or average voltage of the single cell voltage of the fuel cell stack, and when the lowest single cell voltage or the average voltage of the single cell of the fuel cell stack is detected to be higher than a second threshold value, starting internal circulation supply of cathode air of the fuel cell stack to enable the fuel cell stack to be in a performance recovery condition.
3. A fuel cell stack performance recovery method as defined in claim 1, wherein: when the fuel cell stack is in the performance recovery working condition, the internal circulation supply of the cathode air of the fuel cell stack is started, the circulation air flow is regulated, and the ratio of the air flow entering the fuel cell stack from the air inlet pipeline to the circulation air flow is controlled.
4. A fuel cell stack performance recovery method according to any one of claims 1 to 3, wherein: when the fuel cell stack is in the performance recovery working condition, the output current of the fuel cell stack is adjusted, so that the single voltage of the fuel cell continuously and stably changes.
5. A fuel cell stack performance recovery system characterized by: the system comprises a fuel cell stack, an air supply pipeline, a voltage detection module and a controller; wherein:
the air supply pipeline is connected with the cathode of the fuel cell stack and the controller and is used for supplying air and internally circulating cathode air to the cathode of the fuel cell stack;
the voltage detection module is connected with the fuel cell stack and the controller and is used for detecting the voltage of the single cell output by the fuel cell stack and feeding back the voltage value to the controller;
the controller is used for determining whether the output working condition of the fuel cell stack opens the air supply pipeline to supply cathode air in an internal circulation mode and switch the operation working condition:
determining that the fuel cell stack is in a performance recovery working condition, controlling the air supply pipeline to start internal circulation supply of cathode air, and switching the fuel cell stack to a normal operation working condition when the received voltage of the single cell is lower than a first threshold voltage;
and determining that the fuel cell stack is in a normal operation condition, controlling the air supply pipeline to close internal circulation supply of cathode air, and switching the fuel cell stack to a performance recovery condition when the received single cell voltage is higher than a second threshold voltage.
6. A fuel cell stack performance recovery system according to claim 5, wherein: the air supply line includes and advances pipeline and circulating line with the communicating empty of external environment, be equipped with chemical filter, air compressor machine, intercooler and the humidifier that are linked together on the empty pipeline that advances in proper order, the humidifier with fuel cell stack interconnect, circulating line connects respectively the end of giving vent to anger of humidifier and the inlet end of air compressor machine.
7. A fuel cell stack performance recovery system according to claim 6, wherein: circulation line includes and goes out the pipeline and empty return line with the communicating empty of external environment, be equipped with the three-way valve on the empty pipeline, three-way valve one end is passed through empty pipe connection the humidifier, three-way valve one end is passed through empty return line connection the inlet end of air compressor machine, the controller is connected the three-way valve is used for control opening and shutting of three-way valve.
8. A fuel cell stack performance recovery system according to claim 7, wherein: the controller is connected with the three-way valve and is also used for adjusting the opening degree of the three-way valve.
9. A fuel cell stack performance recovery system according to claim 7, wherein: the controller is respectively connected with the air compressor and the three-way valve and is used for adjusting the rotating speed of the air compressor and the opening of the three-way valve to adjust the flow rate of the entering pile air and the oxygen content in the air.
10. A fuel cell stack performance recovery system according to claim 5, wherein: the controller is connected with the fuel cell stack and is also used for determining the output working conditions of the fuel cell stack, including output current regulation and the operation condition of a fuel cell auxiliary system thereof.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793952A (en) * | 2021-08-12 | 2021-12-14 | 上海电气集团股份有限公司 | Fuel cell system and low-temperature starting control method and device thereof |
| CN114759231A (en) * | 2022-04-08 | 2022-07-15 | 中国第一汽车股份有限公司 | Method for recovering linear energy of fuel cell, control device and processor |
| CN114927728A (en) * | 2022-04-13 | 2022-08-19 | 东风汽车集团股份有限公司 | Shutdown and discharge control method and device for fuel cell system and vehicle |
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