CN114464846A - Cathode reduction method and system of fuel cell - Google Patents
Cathode reduction method and system of fuel cell Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000006722 reduction reaction Methods 0.000 claims abstract description 62
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000011946 reduction process Methods 0.000 claims abstract description 18
- 238000010248 power generation Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 3
- 238000002407 reforming Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000000629 steam reforming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000004832 voltammetry Methods 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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
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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
- H01M8/04559—Voltage of fuel cell stacks
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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
- H01M8/04567—Voltage of auxiliary devices, e.g. batteries, capacitors
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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
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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Abstract
The invention discloses a cathode reduction method and a system of a fuel cell, wherein the method comprises the following steps: judging the single running time of the system; if the time is longer than the set time of the cathode reduction of the fuel cell, starting a cathode reduction process, wherein the cathode reduction process comprises the steps of connecting a load switch and a dummy load in series and then connecting the load switch and the dummy load in parallel, and closing the load switch to connect the dummy load so as to reduce the output voltage of the fuel cell; when the output voltage is less than or equal to a preset threshold value, introducing air into the fuel cell, and starting a cathode reduction reaction for a preset time; and judging whether the output voltage of the fuel cell after reaction meets the working condition of the DC/DC circuit, and if so, starting the power generation flow of the fuel cell. The cathode reduction method of the fuel cell provided by the invention avoids the defect that the performance of the fuel cell is easily influenced when instantaneous large current is adopted to remove impurities of the fuel cell, can greatly prolong the service life of the fuel cell, and is simple to implement, low in cost and easy to popularize.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a cathode reduction method and a cathode reduction system of a fuel cell.
Background
The Proton Exchange Membrane Fuel Cell (PEMFC) can be used for building a distributed power station or used as an ideal candidate energy source for low-carbon power of electric vehicles, ships and the like by virtue of the advantages of high energy conversion efficiency, environmental friendliness and the like. Among other things, the durability of a proton exchange membrane fuel cell depends on the fuel cell catalyst performance and life. Since ambient air is required for reaction during the operation of the pem fuel cell, various impurity gases contained in the air are closely related to the performance and the service life of the cell, such as atmospheric pollutants of N0, N02, H2S, S02, etc., wherein the influence of the sulfides in the air at the cathode side on the performance of the cell is particularly significant. Once entering the fuel cell, the impurity gas adsorbs on the cathode Pt catalyst of the fuel cell, occupying the active sites of Pt. When the adsorption reaches a certain degree and the residual active sites cannot meet the requirements of the oxygen reduction reaction, the performance of the battery is reduced. Once the performance of the battery is reduced, particularly the performance attenuation caused by the chemical adsorbed impurities is difficult to recover within the voltage range of the normal operation of the battery, so that the timely elimination of the impurities on the battery electrodes is very critical.
At present, the method for eliminating impurities on an electrode is mainly to apply pulse current for a short time to the electrode, and the principle is to enable the impurities adsorbed on the surface of a catalyst to be oxidized and desorbed through instantaneous large current, and active sites of the catalyst are exposed again, so that the effect of recovering the performance of a battery is achieved. However, this method can be used only when the system is down and cannot be used frequently. Because the catalyst is easy to run off under large current, the active area is reduced, the performance of the battery is influenced, and the service life of the fuel battery is shortened. Meanwhile, the large current impact mode is adopted as a physical mode, and devices such as an IGBT (insulated gate bipolar transistor) and the like need to be additionally arranged, so that the experiment cost is increased.
Disclosure of Invention
The invention aims to provide a cathode reduction method and a cathode reduction system of a fuel cell, which aim to solve the problems that the performance of the cell is easily influenced, the service life of the cell is shortened, the implementation condition is limited and the cost is high in the conventional method for removing impurities of the fuel cell by adopting instantaneous large current.
To achieve the above object, the present invention provides a cathode reduction method of a fuel cell, comprising:
starting a cathode reduction process, wherein a load switch is connected in series with a dummy load and then connected in parallel with the fuel cell, and the load switch is closed to be connected into the dummy load so as to reduce the output voltage of the fuel cell;
when the output voltage is less than or equal to a preset threshold value, introducing air into the fuel cell, and starting a cathode reduction reaction for a preset time;
and judging whether the output voltage of the fuel cell after reaction meets the working condition of the DC/DC circuit, and if so, starting the power generation flow of the fuel cell.
Further, it is preferable that when the output voltage is greater than a preset threshold value, the output voltage of the fuel cell continues to be waited for to decrease until the output voltage of the fuel cell is less than or equal to the preset threshold value.
Further, preferably, the judging whether the output voltage of the reacted fuel cell satisfies the operating condition of the DC/DC circuit includes:
judging whether the output voltage of the fuel cell after reaction is greater than or equal to the input working voltage of the DC/DC circuit; if yes, closing the first contactor to electrify the DC/DC circuit; wherein the content of the first and second substances,
the DC/DC circuit is connected in parallel with the fuel cell, and the first contactor is connected in series between a negative electrode of the DC/DC circuit and a negative electrode of the fuel cell.
Further, it is preferable that, when the output voltage of the fuel cell after the reaction is less than the input operating voltage of the DC/DC circuit, air is continuously introduced into the fuel cell and the cathode reduction reaction is performed until the output voltage of the fuel cell after the reaction is greater than or equal to the input operating voltage of the DC/DC circuit.
Further, preferably, the determining whether the output voltage of the reacted fuel cell satisfies an operating condition of the DC/DC circuit further includes:
judging whether the output voltage of the electrified DC/DC circuit meets a preset condition, if so, closing a second contactor to enable the fuel cell to supply power to a user load; wherein the content of the first and second substances,
the user load is connected in parallel with the fuel cell, and the second contactor is connected in series between one end of the user load and the negative electrode of the fuel cell.
Further, preferably, when the output voltage of the DC/DC circuit after power-on does not satisfy the preset condition, the power-on of the DC/DC circuit is continued until the output voltage of the DC/DC circuit after power-on satisfies the preset condition.
Further, as a preferable mode, before the starting of the cathode reduction process, the method further includes:
acquiring single running time of the system;
and judging whether the single running time is greater than the cathode reduction set time of the fuel cell, and if so, starting a cathode reduction process.
Further, preferably, when the single operation time is less than or equal to the fuel cell cathode reduction set time, the system is continuously operated until the single operation time of the system is greater than the fuel cell cathode reduction set time.
The present invention also provides a cathode reduction system of a fuel cell, comprising:
fuel cell, load switch and dummy load;
the load switch is connected with the dummy load in series, and the whole connected with the dummy load in series is connected with the fuel cell in parallel.
Further, as a preferable mode, the cathode reduction system of the fuel cell further includes:
a DC/DC circuit, a first contactor and a second contactor;
the DC/DC circuit is connected in parallel with the fuel cell; the first contactor is connected in series between the negative pole of the DC/DC circuit and the negative pole of the fuel cell; the second contactor is connected in series between one end of a user load and the negative electrode of the fuel cell.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a cathode reduction method and a system of a fuel cell, wherein the method comprises the following steps: judging the single running time of the system; if the time is longer than the set time of the cathode reduction of the fuel cell, starting a cathode reduction process, wherein the cathode reduction process comprises the steps of connecting a load switch and a dummy load in series and then connecting the load switch and the dummy load in parallel, and closing the load switch to connect the dummy load so as to reduce the output voltage of the fuel cell; when the output voltage is less than or equal to a preset threshold value, introducing air into the fuel cell, and starting a cathode reduction reaction for a preset time; and judging whether the output voltage of the fuel cell after reaction meets the working condition of the DC/DC circuit, and if so, starting the power generation flow of the fuel cell. The cathode reduction method of the fuel cell provided by the invention avoids the defect that the performance of the fuel cell is easily influenced when instantaneous large current is adopted to remove impurities of the fuel cell, can greatly prolong the service life of the fuel cell, and is simple to implement, low in cost and easy to popularize.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a cathode reduction system of a fuel cell according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a method for cathode reduction of a fuel cell according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of the sub-steps of step S30 in FIG. 2;
FIG. 4 is a schematic diagram of a cathode reduction process provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a process for determining conditions for performing cathodic reduction according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of a methanol reforming fuel cell power generation system provided in accordance with an embodiment of the present invention;
fig. 7 is a schematic view showing the overall operation flow of a power generation system of a methanol reforming fuel cell according to an embodiment of the present invention;
fig. 8 is a graph showing the comparative effect of the fuel cell voltage before and after the cathode reduction according to an embodiment of the present 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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that 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. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, in accordance with an embodiment of the present invention, a cathode reduction system of a fuel cell 10 is provided, which includes:
a fuel cell 10, a load switch 20, and a dummy load 30;
the load switch 20 is connected in series with the dummy load 30, and the whole of the series connection is connected in parallel with the fuel cell 10. It will be appreciated that when the load switch 20 is closed, the dummy load 30 forms a loop with the fuel cell 10.
Based on the above system configuration, a method for reducing the cathode of the fuel cell 10 according to an embodiment of the present invention will be described. As shown in fig. 2, the cathode reduction method of the fuel cell 10 includes steps S10 to S30, each of which is as follows:
and S10, starting a cathode reduction process, wherein the process comprises connecting the load switch 20 and the dummy load 30 in series and then connecting the load switch 20 and the dummy load 30 in parallel, and closing the load switch 20 to connect the dummy load 30 so as to reduce the output voltage of the fuel cell 10.
In this step, when the load switch 20 is closed, the dummy load 30 is connected to both ends of the fuel cell 10, and at this time, the output voltage of the fuel cell 10 gradually decreases because the fuel cell 10 discharges to supply power to the dummy load 30.
S20, when the output voltage is less than or equal to the preset threshold, introducing air into the fuel cell 10, and starting the cathode reduction reaction for a preset period of time.
The proton exchange membrane fuel cell has the following reaction formula:
and (3) anode reaction: 2H2-4e-＝4H+；
And (3) cathode reaction: o2+4e-+4H+＝2H2O；
The general reaction formula is as follows: 2H2+ O2 ═ 2H 2O;
in this step, the output voltage of the fuel cell 10 after being mainly reduced is compared with a preset threshold, and when the output voltage is less than or equal to the preset threshold, air is introduced into the fuel cell 10 and a cathode reduction reaction is started for a preset duration; when the output voltage is greater than the preset threshold value, it continues to wait for the output voltage of the fuel cell 10 to decrease until the output voltage of the fuel cell 10 is less than or equal to the preset threshold value. It is understood that the preset threshold and the preset duration of the present embodiment are usually set according to actual needs, and therefore the present embodiment does not limit specific data thereof. Meanwhile, the preset time period in this embodiment is generally in seconds, and the output voltage of the fuel cell 10 is obtained after the cathode reduction reaction is performed for several seconds or several tens of seconds.
S30, it is determined whether the output voltage of the fuel cell 10 after the reaction satisfies the operating condition of the DC/DC circuit 50, and if so, the power generation flow of the fuel cell 10 is started.
In this step, when the output voltage of the fuel cell 10 after the reaction satisfies the operating condition of the DC/DC circuit 50, the power generation flow of the fuel cell 10 is started, otherwise, the cathode reduction reaction of the fuel cell 10 is continued.
Therefore, the cathode reduction method for the fuel cell provided by the embodiment controls the cathode reduction process by monitoring the output voltage of the fuel cell and determining the relationship between the output voltage and the working condition of the DC/DC circuit, thereby avoiding the defect that the performance of the cell is easily affected when the instantaneous large current is adopted to remove impurities from the fuel cell, and greatly prolonging the service life of the fuel cell.
Referring to fig. 3, in an embodiment of the present invention, step S30 further includes the following sub-steps:
s301, judging whether the output voltage of the fuel cell 10 after reaction is greater than or equal to the input working voltage of the DC/DC circuit 50; if so, closing the first contactor 40 to power up the DC/DC circuit 50; wherein the content of the first and second substances,
the DC/DC circuit 50 is connected in parallel with the fuel cell 10, and the first contactor 40 is connected in series between the negative electrode of the DC/DC circuit 50 and the negative electrode of the fuel cell 10;
s302, determining whether the output voltage of the powered DC/DC circuit 50 meets a preset condition, if yes, closing the second contactor 60 to enable the fuel cell 10 to supply power to the user load 70; wherein the content of the first and second substances,
the user load 70 is connected in parallel with the fuel cell 10, and the second contactor 60 is connected in series between one end of the user load 70 and the negative electrode of the fuel cell 10.
In order to assist understanding of the flow of the present embodiment, supplementary explanation of the structure of the cathode reduction system of the fuel cell 10 shown in fig. 1 is required. In one embodiment, the cathode reduction system of the fuel cell 10 further includes:
a DC/DC circuit 50, a first contactor 40, and a second contactor 60; wherein the content of the first and second substances,
the DC/DC circuit 50 connects the fuel cells 10 in parallel;
the first contactor 40 is connected in series between the negative electrode of the DC/DC circuit 50 and the negative electrode of the fuel cell 10; the second contactor 60 is connected in series between one end of the user load 70 and the negative electrode of the fuel cell 10.
Based on the above configuration, first, in step S301, it is determined whether the output voltage of the fuel cell 10 after the reaction is greater than or equal to the input operating voltage of the DC/DC circuit 50;
if so, closing the first contactor 40 to power up the DC/DC circuit 50;
if not, air continues to be introduced into the fuel cell 10 and the cathode reduction reaction proceeds until the output voltage of the fuel cell 10 after the reaction is greater than or equal to the input operating voltage of the DC/DC circuit 50.
Further, after the DC/DC circuit 50 is powered on for a period of time, it is determined whether the output voltage meets a preset condition;
if so, closing the second contactor 60 to enable the fuel cell 10 to supply power to the user load 70;
if yes, the DC/DC circuit 50 is continuously powered up until the output voltage of the powered-up DC/DC circuit 50 meets the preset condition.
It should be noted that the preset condition in the present embodiment mainly enables the output voltage of the DC/DC circuit 50 to meet the operation requirement, that is, the power supply requirement for the user load 70.
In summary, the specific content of the cathode reduction process provided by the present invention is shown in fig. 4, which includes:
firstly, closing a load switch 20 to connect a dummy load 30, so that the output voltage of the fuel cell 10 is reduced, introducing air into the fuel cell 10 when the output voltage is reduced to a preset threshold value, and starting a cathode reduction reaction for a certain time; then, judging whether the output voltage of the fuel cell 10 after reaction reaches the input voltage of the normal operation of the DC/DC circuit 50, if so, closing the first contactor 40 to electrify the DC/DC circuit 50, and if not, continuing to introduce air into the fuel cell 10 and performing a cathode reduction reaction; after the DC/DC circuit 50 is powered on for a period of time, it is determined whether the output voltage of the DC/DC circuit 50 meets the power consumption requirement of the user load 70, if yes, the second contactor 60 may be closed, so that the fuel cell 10 outputs the power to the outside to start normal power generation; if not, then the DC/DC circuit 50 continues to be powered up.
Therefore, the embodiment determines the relationship between the output voltage of the fuel cell and the working condition of the DC/DC circuit, and further controls the cathode reduction process, so as to ensure that the power generation of the fuel cell can meet the working requirement of the user load, avoid the defect that the performance of the fuel cell is easily affected when the instantaneous large current is adopted to remove the impurities of the fuel cell, and greatly prolong the service life of the fuel cell.
Referring to fig. 5, in one embodiment, before the step S10, that is, before starting the cathode reduction process, the method further includes:
acquiring single running time of the system;
judging whether the single operation time is greater than the cathode reduction set time of the fuel cell 10;
if yes, starting a cathode reduction process;
if not, the system is continuously operated until the single operation time of the system is more than the cathode reduction set time of the fuel cell 10.
In this embodiment, the fuel cell 10 requires that the cathode reduction time parameter be set to Trdt, which is adjustable. Wherein, the single running time of the system is T, and when T > Trdt, the cathode reduction program is executed. It should be noted that the time parameter is obtained according to a test, and when the system continues to operate for the time Trdt, the voltage of the fuel cell 10 will decay to a relatively low value, so that the reduction at this time will recover the voltage of the fuel cell 10 to a normal level, and continue to operate the system stably.
Referring to fig. 6, in one embodiment, a methanol reforming fuel cell power generation system for use in a cathode reduction method of the fuel cell 10 is also provided. Fig. 7 is an overall operation flow of the system. As shown in fig. 7, the flow from the start of the apparatus to the start of hydrogen reforming to the fuel cell power generation is a normal power generation flow, and when a shutdown instruction is received, the flow is performed according to a shutdown flow. When the system controls the power of the fuel cell to be reduced to the lowest power, the air introduction of the fuel cell is stopped, the cathode reduction process is started, and after the hydrogen introduction is stopped and the shutdown process is started, the system starts to operate from the fuel cell inspection step. Finally, a graph of the effect of comparing the fuel cell voltage before and after cathode reduction is shown in fig. 8. As can be seen from fig. 8, the cathode reduction method for a fuel cell provided by the present invention can make the voltammetry curve after cathode reduction more stable, i.e., indicate that the system operates more stably. Therefore, the present embodiment replaces the existing physical mode to perform the cathode reduction control of the fuel cell by providing a complete system program control mode, thereby avoiding the disadvantage that the performance of the fuel cell is easily affected when the impurities of the fuel cell are removed by adopting the instantaneous large current, greatly prolonging the service life of the fuel cell, and being simple to implement, low in cost and easy to popularize.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method of cathode reduction for a fuel cell, comprising:
starting a cathode reduction process, wherein a load switch is connected in series with a dummy load and then connected in parallel with the fuel cell, and the load switch is closed to be connected into the dummy load so as to reduce the output voltage of the fuel cell;
when the output voltage is less than or equal to a preset threshold value, introducing air into the fuel cell, and starting a cathode reduction reaction for a preset time;
and judging whether the output voltage of the fuel cell after reaction meets the working condition of the DC/DC circuit, and if so, starting the power generation flow of the fuel cell.
2. The cathode reduction method of a fuel cell according to claim 1, wherein when the output voltage is greater than a preset threshold, the output voltage of the fuel cell is continuously waited for to decrease until the output voltage of the fuel cell is less than or equal to the preset threshold.
3. The cathode reduction method of a fuel cell according to claim 1, wherein the determining whether the output voltage of the reacted fuel cell satisfies an operating condition of a DC/DC circuit includes:
judging whether the output voltage of the fuel cell after reaction is greater than or equal to the input working voltage of the DC/DC circuit; if yes, closing the first contactor to electrify the DC/DC circuit; wherein the content of the first and second substances,
the DC/DC circuit is connected in parallel with the fuel cell, and the first contactor is connected in series between a negative electrode of the DC/DC circuit and a negative electrode of the fuel cell.
4. The cathode reduction method of a fuel cell according to claim 3, wherein when the output voltage of the reacted fuel cell is less than the input operating voltage of the DC/DC circuit, air is continuously introduced into the fuel cell and the cathode reduction reaction is performed until the output voltage of the reacted fuel cell is greater than or equal to the input operating voltage of the DC/DC circuit.
5. The cathode reduction method for a fuel cell according to claim 3, wherein the determining whether the output voltage of the reacted fuel cell satisfies an operating condition of the DC/DC circuit further includes:
judging whether the output voltage of the electrified DC/DC circuit meets a preset condition, if so, closing a second contactor to enable the fuel cell to supply power to a user load; wherein the content of the first and second substances,
the user load is connected in parallel with the fuel cell, and the second contactor is connected in series between one end of the user load and the negative electrode of the fuel cell.
6. The cathode reduction method of a fuel cell according to claim 5, wherein when the output voltage of the DC/DC circuit after power-on does not satisfy the preset condition, power-on of the DC/DC circuit is continued until the output voltage of the DC/DC circuit after power-on satisfies the preset condition.
7. The cathode reduction method for a fuel cell according to claim 1, further comprising, before the starting of the cathode reduction process:
acquiring single running time of the system;
and judging whether the single running time is greater than the cathode reduction set time of the fuel cell, and if so, starting a cathode reduction process.
8. The cathode reduction method for a fuel cell according to claim 7, wherein when the single operation time is less than or equal to the fuel cell cathode reduction set time, the system is continuously operated until the single operation time of the system is greater than the fuel cell cathode reduction set time.
9. A cathode reduction system for a fuel cell, comprising:
fuel cell, load switch and dummy load;
the load switch is connected with the dummy load in series, and the whole connected with the dummy load in series is connected with the fuel cell in parallel.
10. The cathode reduction system for a fuel cell according to claim 9, further comprising:
a DC/DC circuit, a first contactor and a second contactor;
the DC/DC circuit is connected in parallel with the fuel cell; the first contactor is connected in series between the negative pole of the DC/DC circuit and the negative pole of the fuel cell; the second contactor is connected in series between one end of a user load and the negative electrode of the fuel cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210018250.2A CN114464846B (en) | 2022-01-07 | Cathode reduction method and system of fuel cell |
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| CN202210018250.2A CN114464846B (en) | 2022-01-07 | Cathode reduction method and system of fuel cell |
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| CN115775899A (en) * | 2022-11-22 | 2023-03-10 | 上海氢晨新能源科技有限公司 | Dynamic control method of fuel cell system, electronic equipment and storage medium |
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| CN115775899A (en) * | 2022-11-22 | 2023-03-10 | 上海氢晨新能源科技有限公司 | Dynamic control method of fuel cell system, electronic equipment and storage medium |
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