CN111740134A - Method for activating electric pile of fuel cell - Google Patents
Method for activating electric pile of fuel cell Download PDFInfo
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- CN111740134A CN111740134A CN202010427573.8A CN202010427573A CN111740134A CN 111740134 A CN111740134 A CN 111740134A CN 202010427573 A CN202010427573 A CN 202010427573A CN 111740134 A CN111740134 A CN 111740134A
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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
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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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04037—Electrical heating
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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
- H01M8/04225—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 during start-up
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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
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04302—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during start-up
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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
- H01M8/04858—Electric variables
- H01M8/04895—Current
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a fuel cell stack activation method, which comprises the following specific steps: carrying out sectional loading on the galvanic pile; presetting a first loading load and a first unloading load respectively, and loading the galvanic pile to the first loading load; unloading the actual load of the electric pile into the first unloading load; unloading the actual load of the electric pile to zero; respectively presetting a second loading load and a first air stoichiometric ratio; loading a stack to the second loading load; adjusting an actual air stoichiometric ratio of the stack to the first air stoichiometric ratio; the actual load of the stack is unloaded to zero. According to the method for activating the fuel cell stack, provided by the embodiment of the invention, the discharge current is subjected to different and targeted regulation and control, and the catalyst is reduced at the active point position by hydrogen and activated at a low potential, so that the activation time is greatly shortened, and the production efficiency of the proton exchange membrane fuel cell is improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell stack activation method.
Background
The fuel cell is a chemical device for directly converting chemical energy of fuel into electric energy, is not limited by carnot cycle effect, and takes fuel and oxygen as raw materials; and no mechanical transmission part is arranged, so that no noise pollution is caused, and the discharged harmful gas is very little. Proton exchange membrane fuel cells have been receiving more and more attention in recent years due to their characteristics of low temperature starting, simple structure, easy operation, etc.
Since the fuel cell stack has low activity in electrochemical reactions during initial operation, it is necessary to perform an activation process on the stack in advance under predetermined conditions to maximally secure normal initial performance of the fuel cell stack. In the prior art, the activation method of the proton exchange membrane fuel cell stack usually selects constant large current to continuously discharge the stack to achieve the purpose of forced activation, and the process usually needs to consume a long time (generally 12-48 hours), thereby seriously affecting the production efficiency of the fuel cell.
Disclosure of Invention
The invention provides a fuel cell stack activation method, which aims to solve the technical problem that the existing proton exchange membrane fuel cell stack activation process consumes a large amount of time.
In order to solve the above technical problem, an embodiment of the present invention provides a method for activating a stack of a fuel cell, including:
dividing a rated load of a galvanic pile into at least three stepped preset target loads with a first loading slope, sequentially achieving each preset target load in the discharging process of the galvanic pile, operating for a first preset time when each preset target load is achieved, and unloading the actual load of the galvanic pile to be zero with a first unloading slope when the rated load is achieved;
step two, respectively presetting a first loading load and a first unloading load, and operating a first preset discharging step for multiple times in the process of discharging the galvanic pile, wherein the first unloading load is smaller than the first loading load, the first loading load is greater than or equal to the rated load, and the first preset discharging step is as follows:
loading the stack to the first loading load at a second loading slope;
running for a second preset time when the first loading load is reached, unloading the actual load of the galvanic pile into the first unloading load after the first loading load is reached, running for a third preset time when the first unloading load is reached, cutting off air supply, keeping hydrogen supply and keeping the galvanic pile at a first preset temperature;
after the operation is carried out for the third preset time, the actual load of the electric pile is unloaded to zero by a second unloading slope, and in a fourth preset time after the actual load of the electric pile is unloaded to zero, the hydrogen gas cavity is kept at a first preset hydrogen pressure, the electric pile is kept at a second preset temperature, and the air cavity is kept at a first preset air pressure;
respectively presetting a second loading load and a first air stoichiometric ratio, and operating a second preset discharging step for multiple times in the process of discharging the galvanic pile, wherein the second loading load is the rated load of the galvanic pile, and the second preset discharging step is as follows:
loading the stack to the second loading load at a third loading slope;
operating for a fifth preset time when the second loading load is reached, adjusting the actual air stoichiometric ratio of the galvanic pile to the first air stoichiometric ratio after the second loading load is reached, and operating for a sixth preset time when the first air stoichiometric ratio is reached;
and after the sixth preset time, unloading the actual load of the electric pile to zero by using a third unloading slope, and cutting off the supply of air and hydrogen within a seventh preset time after the actual load of the electric pile is unloaded to zero.
Preferably, after the second preset discharging step is performed for a plurality of times, a polarization test is further included, where the polarization test is:
respectively presetting a third loading load and a preset current density, respectively loading the galvanic pile in multiple sections by taking the preset current density as a loading increment, respectively operating each section for eighth preset time, and unloading the actual load of the galvanic pile to be zero by a fourth unloading slope after the galvanic pile is loaded to the preset third loading load.
Preferably, after the polarization test, the method further comprises a subsequent process, wherein the subsequent process comprises:
purging the hydrogen cavity according to a preset hydrogen pulse discharge frequency;
purging the air chamber according to a second air stoichiometry ratio;
and reducing the actual temperature of the galvanic pile to normal temperature according to a preset temperature reduction rate.
Preferably, the ranges of the first loading slope, the second loading slope and the third loading slope are all 10-30A/S.
Preferably, the range of the first preset time and the range of the eighth preset time are both 180-600 s; the second preset time range is 60-600 s; the third preset time and the sixth preset time are both in the range of 30-90 s; the range of the fourth preset time and the range of the fifth preset time are both 60-120 s; the range of the seventh preset time is 30-120 s.
Preferably, the ranges of the first unloading slope, the third unloading slope and the fourth unloading slope are 10-30A/S; the second unloading slope is in the range of 5-30A/s.
As a preferred scheme, the preset first loading load is a preset multiple of the rated load of the galvanic pile, and the range of the preset multiple is 1.0-2.0; the preset third loading load is 1.2 times of the rated load of the galvanic pile; the range of the first unloading load is 5-25A.
Preferably, the first preset temperature and the second preset temperature are both in a range of 50-90 ℃.
Preferably, the range of the stoichiometric ratio of the first air is 0.2-1; the second air stoichiometric ratio ranges from 2.0 to 15.0.
Preferably, the preset current density is 50-300 mA/cm2。
Compared with the prior art, the embodiment of the invention has the advantages that the multi-section discharge of the step one is firstly carried out on the fuel cell stack, so that the temperature of the stack reaches the normal working temperature and the inside is basically wet, and the preheating effect is achieved; secondly, through the steps of two and three: the first preset discharging step and the second preset discharging step are operated for multiple times, the discharging current is controlled differently and pertinently, the water vapor channel of the membrane electrode MEA of the proton exchange membrane fuel cell is opened to purify the bipolar plate and the surface of the membrane electrode MEA, and the first preset discharging step and the second preset discharging step can effectively burn the surface of the membrane electrode MEA, increase the surface area of the catalyst and reduce the activation energy barrier. The whole proton exchange membrane fuel cell stack activation method has clear steps, can realize rapid activation of the stack by carrying out different and targeted regulation and control on discharge current, and reducing the active point position of the catalyst by hydrogen and activating the catalyst by low potential, can control the activation process within 2h, greatly shortens the activation time compared with the activation method in the prior art, and improves the use and production efficiency of the proton exchange membrane fuel cell.
Drawings
FIG. 1 is a schematic flow diagram of a method of activating a stack of fuel cells in an embodiment of the invention;
FIG. 2 is a graphical representation of a comparison of performance data for two activation regimes at the same time in an example of the invention.
Detailed Description
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.
In the description of the present application, it is to be understood that the terms "first", "second", "third", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In a fuel cell, a stack is a site where electrochemical reaction of a cell occurs, and is a core part of a power system of the fuel cell. When the electric pile works, hydrogen and oxygen are respectively introduced from the inlet, distributed to the bipolar plates of the monocells through the main gas channel of the electric pile, uniformly distributed to the electrodes through the diversion of the bipolar plates, and contacted with the catalyst through the electrode support body to carry out electrochemical reaction. In order to ensure the normal initial performance of the fuel cell stack to the maximum extent, an embodiment of the present invention provides a method for activating the fuel cell stack, and specifically, referring to fig. 1, fig. 1 is a schematic flow chart of the method for activating the fuel cell stack according to the embodiment of the present invention, which includes the following specific steps:
the method comprises the steps that firstly, rated loads of a galvanic pile are divided into at least three stepped preset target loads by a first loading slope, each preset target load is reached in sequence in the process of discharging the galvanic pile, the operation is carried out for a first preset time when each preset target load is reached, and actual loads of the galvanic pile are unloaded to be zero by a first unloading slope when the rated loads are reached.
Preferably, in the embodiment, the rated load of the stack is averagely divided into three stepped preset target loads, the first preset target load is B/3(B is the rated load), the second preset target load is increased by B/3 on the basis of the first preset target load, the third preset target load is B, the stack is discharged through a loading slope of 10-30A/S, so that the stack sequentially reaches the preset target load of each section, the stack stays in each section for 3-10 min, and then the actual load of the stack is unloaded to zero according to an unloading slope of 10-30A/S. In this way, the temperature of the galvanic pile reaches the normal working temperature and the interior is basically wet, and finally the preheating effect is achieved.
Step two, respectively presetting a first loading load and a first unloading load, and operating a first preset discharging step (which can be operated for 10-40 times according to actual conditions) for multiple times in the process of discharging the galvanic pile, wherein the first unloading load is smaller than the first loading load, the first loading load is greater than or equal to the rated load, and the first preset discharging step is as follows:
preferably, in this embodiment, the stack is loaded to the first loading load according to a loading slope of 10 to 30A/s, the first loading load is a load with a certain multiple of a rated load, the operation is performed for 60 to 600s when the first loading load is reached, and after the first loading load is reached, the actual load of the stack is unloaded to the first unloading load according to an unloading slope of 10 to 30A/s, at this stage, the air supply is cut off, the hydrogen supply is maintained, the stack is maintained at the first preset temperature, and the stack is operated for a third preset time.
After the operation is carried out for the third preset time, the actual load of the electric pile is unloaded to zero by an unloading slope (namely, a second unloading slope) of 5-30A/s, after the actual load of the electric pile is unloaded to zero, the fourth preset time is kept, in the stage, the hydrogen air chamber is kept at a first preset hydrogen pressure (preferably 10-50 kpa in the embodiment) according to actual conditions, the air chamber is kept at a first preset air pressure (preferably 0kpa in the embodiment), the electric pile is kept at a second preset temperature, and the fourth preset time is kept.
Step three, respectively presetting a second loading load and a first air stoichiometric ratio, and operating a second preset discharging step (which can be operated for 10-40 times according to actual conditions) for multiple times in the process of discharging the galvanic pile, wherein the second loading load is the rated load of the galvanic pile, and the second preset discharging step is as follows:
and loading the electric pile to the second loading load with a third loading slope, preferably, in the embodiment, loading the electric pile to a rated load (namely, the second loading load) according to a loading slope of 10-30A/s, operating for 60-120 s (namely, the fifth preset time) at the rated load, then adjusting the air stoichiometric ratio to the first air stoichiometric ratio according to an air stoichiometric ratio descending slope of 0.2/s under the condition of the rated load, operating for a sixth preset time under the condition, and finally unloading the actual load of the electric pile to 0A according to a descending slope (namely, the third unloading slope) of 10-30A/s, and at the stage, cutting off the air and hydrogen supply and keeping for 30-120 s (namely, the seventh preset time).
Through the operation of the multiple first preset discharging step and the operation of the multiple second preset discharging step in the second step and the third step, the discharging current is controlled differently and specifically, the water vapor channel of the membrane electrode MEA of the proton exchange membrane fuel cell is opened to purify the bipolar plate and the surface of the membrane electrode MEA, and the first preset discharging step and the second preset discharging step can effectively burn the surface of the membrane electrode MEA, increase the surface area of the catalyst and reduce the activation energy barrier.
Preferably, in this embodiment, after the third step is executed, a polarization test is further included, where the polarization test is:
respectively presetting a third loading load and a preset current density, respectively loading the galvanic pile in multiple sections by taking the preset current density as a loading increment, respectively operating each section for eighth preset time, and unloading the actual load of the galvanic pile to be zero by a fourth unloading slope after the galvanic pile is loaded to the preset third loading load.
Preferably, in the above embodiment, after the polarization test, a subsequent process is further included, where the subsequent process is:
purging the hydrogen cavity according to a preset hydrogen pulse discharge frequency; in the embodiment, the pulse discharge frequency of the hydrogen is 0.2-5 s/10s, the air cavity is purged according to the air stoichiometric ratio of 2.0-15 (namely the second air stoichiometric ratio) under the normal humidifying condition that the relative humidity of the air is 0% -100%, the operation is carried out for 5-10 min under the condition, and meanwhile, the purging process is carried out according to the proportion of 10-200mA/cm2And (3) loading current density, finally, regulating the temperature of the cooling liquid for many times, reducing the temperature of the galvanic pile to 40-55 ℃ according to the cooling rate of 3-5 ℃/min, maintaining for 1-3 min at the temperature, reducing the temperature of the galvanic pile to 25-45 ℃ according to the cooling rate of 3-5 ℃/min, maintaining for 1-3 min at the temperature, and reducing the temperature of the galvanic pile to the normal temperature according to the cooling rate of 3-5 ℃/min.
The embodiment ensures the use performance of the proton exchange membrane fuel cell after activation by carrying out polarization test and subsequent purging treatment on the fuel cell, and meanwhile, the time of the polarization test and the subsequent treatment process in the embodiment can be controlled within one hour, so that the use efficiency of the fuel cell can be greatly improved, and the use performance of the cell is further ensured.
Preferably, in this embodiment, the ranges of the first loading slope, the second loading slope and the third loading slope are all 10-30A/S.
Preferably, in this embodiment, the first preset time and the eighth preset time both range from 3 to 10 min; the second preset time range is 60-600 s; the third preset time and the sixth preset time are both in the range of 30-90 s; the range of the fourth preset time and the range of the fifth preset time are both 60-120 s; the range of the seventh preset time is 30-120 s.
Preferably, in this embodiment, the ranges of the first unloading slope, the third unloading slope and the fourth unloading slope are 10-30A/S; the second unloading slope is in the range of 5-30A/s.
Preferably, in this embodiment, the preset first loading load is a preset multiple of a rated load of the galvanic pile, and the range of the preset multiple is 1.0-2.0; the preset third loading load is 1.2 times of the rated load of the galvanic pile; the range of the first unloading load is 5-25A.
Preferably, in this embodiment, the first preset temperature and the second preset temperature both range from 50 ℃ to 90 ℃.
Preferably, in the embodiment, the first air stoichiometric ratio ranges from 0.2 to 1; the second air stoichiometric ratio ranges from 2.0 to 15.0.
Preferably, in this embodiment, the preset current density ranges from 50 to 300mA/cm2。
The method for activating the fuel cell stack provided by the embodiment of the invention comprises the following steps of firstly carrying out multi-section discharging on the fuel cell stack in the first step to ensure that the temperature of the stack reaches the normal working temperature and the inside of the stack is basically wet, thereby achieving the preheating effect; secondly, through the steps of two and three: the method comprises the steps of ' operating a plurality of first preset discharging steps ' and ' operating a plurality of second preset discharging steps ', carrying out different and targeted regulation and control on discharging current, opening a water vapor channel of a membrane electrode MEA (membrane electrode assembly) of the proton exchange membrane fuel cell, purifying the surfaces of a bipolar plate and the membrane electrode MEA, reducing a Pt-C catalyst of a cathode through different steps, increasing the surface area of the catalyst, reducing an activation energy barrier, further activating the activity of the Pt-C catalyst through an oxygen starvation mode, burning ' garbage on the surface of the MEA, particularly on a CCM (continuous current module) layer, further increasing the surface area of the catalyst, reducing the activation energy barrier, and carrying out a multi-point polarization test on the activated stack according to actual requirements. And finally, carrying out galvanic pile hydrogen and cavity purging according to a specific post-treatment program, and slowly reducing the galvanic pile to a normal temperature state. The steps of the whole method for activating the electric pile of the proton exchange membrane fuel cell are clear, the electric pile can be quickly activated, the activation process can be controlled within 2h, meanwhile, compared with a conventional method, the method for quickly activating the electric pile provided by the invention can also effectively guarantee the service performance of the cell, specifically, please refer to fig. 2, fig. 2 is a performance data comparison schematic diagram of two activation modes in the same time provided by the embodiment of the invention, and as can be known from the diagram, the method for quickly activating the electric pile in the embodiment can effectively shorten the activation time while ensuring the cell performance. In conclusion, the method for activating the fuel cell stack greatly shortens the activation time, improves the service efficiency of the proton exchange membrane fuel cell, and ensures the service performance of the cell.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method of activating a fuel cell stack, comprising:
dividing a rated load of a galvanic pile into at least three stepped preset target loads with a first loading slope, sequentially achieving each preset target load in the discharging process of the galvanic pile, operating for a first preset time when each preset target load is achieved, and unloading the actual load of the galvanic pile to be zero with a first unloading slope when the rated load is achieved;
step two, respectively presetting a first loading load and a first unloading load, and operating a first preset discharging step for multiple times in the process of discharging the galvanic pile, wherein the first unloading load is smaller than the first loading load, the first loading load is greater than or equal to the rated load, and the first preset discharging step is as follows:
loading the stack to the first loading load at a second loading slope;
running for a second preset time when the first loading load is reached, unloading the actual load of the galvanic pile into the first unloading load after the first loading load is reached, running for a third preset time when the first unloading load is reached, cutting off air supply, keeping hydrogen supply and keeping the galvanic pile at a first preset temperature;
after the operation is carried out for the third preset time, the actual load of the electric pile is unloaded to zero by a second unloading slope, and in a fourth preset time after the actual load of the electric pile is unloaded to zero, the hydrogen gas cavity is kept at a first preset hydrogen pressure, the electric pile is kept at a second preset temperature, and the air cavity is kept at a first preset air pressure;
respectively presetting a second loading load and a first air stoichiometric ratio, and operating a second preset discharging step for multiple times in the process of discharging the galvanic pile, wherein the second loading load is the rated load of the galvanic pile, and the second preset discharging step is as follows:
loading the stack to the second loading load at a third loading slope;
operating for a fifth preset time when the second loading load is reached, adjusting the actual air stoichiometric ratio of the galvanic pile to the first air stoichiometric ratio after the second loading load is reached, and operating for a sixth preset time when the first air stoichiometric ratio is reached;
and after the sixth preset time, unloading the actual load of the electric pile to zero by using a third unloading slope, and cutting off the supply of air and hydrogen within a seventh preset time after the actual load of the electric pile is unloaded to zero.
2. The stack activation method for a fuel cell according to claim 1, further comprising a polarization test after running the second preset discharging step a plurality of times, the polarization test being:
respectively presetting a third loading load and a preset current density, respectively loading the galvanic pile in multiple sections by taking the preset current density as a loading increment, respectively operating each section for eighth preset time, and unloading the actual load of the galvanic pile to be zero by a fourth unloading slope after the galvanic pile is loaded to the preset third loading load.
3. The stack activation method for a fuel cell according to claim 2, further comprising, after the polarization test, a post-process of:
purging the hydrogen cavity according to a preset hydrogen pulse discharge frequency;
purging the air chamber according to a second air stoichiometry ratio;
and reducing the actual temperature of the galvanic pile to normal temperature according to a preset temperature reduction rate.
4. The method for activating a fuel cell stack according to claim 1, wherein the first loading slope, the second loading slope, and the third loading slope are each in a range of 10 to 30A/S.
5. The method for activating a fuel cell stack according to claim 2, wherein the first predetermined time and the eighth predetermined time both range from 180 to 600 seconds; the second preset time range is 60-600 s; the third preset time and the sixth preset time are both in the range of 30-90 s; the range of the fourth preset time and the range of the fifth preset time are both 60-120 s; the range of the seventh preset time is 30-120 s.
6. The method for activating a fuel cell stack according to claim 2, wherein the first unloading slope, the third unloading slope and the fourth unloading slope are each in a range of 10 to 30A/S; the second unloading slope is in the range of 5-30A/s.
7. The fuel cell stack activation method according to claim 2, wherein the preset first load is a preset multiple of a rated load of the stack, and the preset multiple is in a range of 1.0 to 2.0; the preset third loading load is 1.2 times of the rated load of the galvanic pile; the range of the first unloading load is 5-25A.
8. The method for activating a fuel cell stack according to claim 1, wherein the first predetermined temperature and the second predetermined temperature are both in a range of 50 to 90 ℃.
9. The fuel cell stack activation method according to claim 3, wherein the first air stoichiometric ratio is in a range of 0.2 to 1; the second air stoichiometric ratio ranges from 2.0 to 15.0.
10. The stack activation method of a fuel cell according to claim 2, wherein the predetermined current density is in a range of 50 to 300mA/cm2。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112813460A (en) * | 2020-12-28 | 2021-05-18 | 同济大学 | Membrane electrode activation method for SPE electrolytic cell, application and electrolytic cell structure |
| CN114597450A (en) * | 2022-03-09 | 2022-06-07 | 大同氢雄云鼎氢能科技有限公司 | Rapid activation method of fuel cell system |
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