CN116799264A - Fuel cell system, operation evaluation method, evaluation device, and storage medium - Google Patents

Fuel cell system, operation evaluation method, evaluation device, and storage medium Download PDF

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CN116799264A
CN116799264A CN202210270927.1A CN202210270927A CN116799264A CN 116799264 A CN116799264 A CN 116799264A CN 202210270927 A CN202210270927 A CN 202210270927A CN 116799264 A CN116799264 A CN 116799264A
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fuel cell
cell system
voltage
current
average
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刘新海
翟浩雄
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If Technology Co Ltd
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If Technology Co Ltd
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04552—Voltage of the individual fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04604—Power, energy, capacity or load
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Medical Informatics (AREA)
  • Fuzzy Systems (AREA)
  • Evolutionary Computation (AREA)
  • Health & Medical Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Artificial Intelligence (AREA)
  • Fuel Cell (AREA)

Abstract

The invention discloses a fuel cell system and an operation evaluation method, an evaluation device and a storage medium thereof, wherein the operation evaluation method of the fuel cell system comprises the following steps: determining a judgment power value of the fuel cell system; when the fuel cell system outputs at the judging power value, the current electric pile average single cell voltage of the fuel cell system is obtained; determining a voltage difference value between the current electric pile average single cell voltage and the electric pile average single cell voltage acquired last time; when the voltage difference is smaller than a first preset voltage threshold, the operation condition of the fuel cell system is evaluated according to the current average single cell voltage of the electric pile, the problem that the service life of the fuel cell system is inaccurate in evaluation by directly monitoring the voltage of the electric pile is solved, the operation evaluation accuracy of the fuel cell system is improved, a user timely adjusts the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, the service life of the fuel cell system is prolonged, and the user experience is improved.

Description

Fuel cell system, operation evaluation method, evaluation device, and storage medium
Technical Field
The present invention relates to the technical field of fuel cell systems, and more particularly, to an operation evaluation method of a fuel cell system, a computer-readable storage medium, a fuel cell system, and an operation evaluation device of a fuel cell system.
Background
The fuel cell system is a device for generating electric power through electrochemical reaction of air and hydrogen, and is one of important development directions of new energy automobile engines in the future due to the high efficiency and pollution-free characteristics. Currently, in practical use, the life of a fuel cell system can generally reach 5000-10000 hours, and the main failure part is a galvanic pile. Therefore, stack life is generally taken as a core evaluation item of fuel cell system life. That is, the stack life may be regarded as a core evaluation item of the operation evaluation of the fuel cell system.
In the related art, when operation evaluation is performed on a fuel cell system, it is common to directly monitor the cell voltage in a cell stack on line, and when the cell stack voltage drops, it is determined that the life of the cell stack is about to run out. However, when the stack does not meet the operation requirement under a certain time condition, or when the fuel cell system fails, the stack voltage also drops, so that erroneous judgment is generated, and the accuracy of the operation evaluation of the fuel cell system is affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide an operation evaluation method of a fuel cell system, which evaluates the operation condition of the fuel cell system according to the current average cell voltage of a cell stack when the fuel cell system outputs a judgment power value, thereby solving the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell stack voltage, improving the accuracy of operation evaluation of the fuel cell system, enabling a user to adjust the use mode of the fuel cell in time according to the operation evaluation condition of the fuel cell system, prolonging the service life of the fuel cell system, and improving the user experience.
A second object of the present invention is to propose a computer readable storage medium.
A third object of the present invention is to propose a fuel cell system.
A fourth object of the present invention is to provide an operation evaluation device of a fuel cell system.
To achieve the above object, an embodiment of a first aspect of the present invention provides an operation evaluation method of a fuel cell system, the method comprising: determining a judgment power value of the fuel cell system; when the fuel cell system outputs at the judging power value, the current electric pile average single cell voltage of the fuel cell system is obtained; determining a voltage difference value between the current electric pile average single cell voltage and the electric pile average single cell voltage acquired last time; and when the voltage difference is smaller than a first preset voltage threshold, evaluating the operation condition of the fuel cell system according to the current average single cell voltage of the electric pile.
According to the operation evaluation method of the fuel cell system, the judgment power value of the fuel cell system is determined, when the fuel cell system outputs the judgment power value, the current electric pile average single cell voltage of the fuel cell system is obtained, and when the voltage difference between the current electric pile average single cell voltage and the electric pile average single cell voltage obtained last time is smaller than the first preset voltage threshold value, the operation condition of the fuel cell system is evaluated according to the current electric pile average single cell voltage, the problem that the operation evaluation of the fuel cell system is inaccurate by directly monitoring the electric pile voltage is solved, the operation evaluation accuracy of the fuel cell system is improved, the use mode of the fuel cell is timely adjusted according to the operation evaluation condition of the fuel cell system by a user, the service life of the fuel cell system is prolonged, and the user experience is improved.
In addition, the operation evaluation method of the fuel cell system according to the above-described embodiment of the invention may have the following additional features:
according to one embodiment of the present invention, obtaining a current stack average cell voltage of a fuel cell system includes: determining the voltage of each single cell, and calculating a first average voltage value according to the voltage of each single cell; obtaining a plurality of first average voltage values in a preset time period; and carrying out average value calculation on a plurality of first average voltage values in a preset time period to obtain the current average cell voltage of the electric pile.
According to an embodiment of the present invention, when acquiring the current stack average cell voltage of the fuel cell system, the operation evaluation method of the fuel cell system further includes: judging whether a fault exists in the fuel cell system;
if yes, discarding the current electric pile average single cell voltage; if not, the current stack average cell voltage is stored.
According to one embodiment of the present invention, after determining the voltage difference between the current stack average cell voltage and the last acquired stack average cell voltage, the operation evaluation method of the fuel cell system further includes: and discarding the current average cell voltage of the electric pile when the voltage difference value is larger than or equal to a first preset voltage threshold value.
According to one embodiment of the present invention, evaluating the operation of the fuel cell system based on the current stack average cell voltage includes: when the current average single cell voltage of the electric pile is smaller than or equal to a second preset voltage threshold value, acquiring the actual working time of the fuel cell system, and judging whether the actual working time of the fuel cell system is smaller than a preset test time or not; if so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition; if not, the operating condition of the fuel cell system is determined to be normal.
According to one embodiment of the present invention, the operation condition of the fuel cell system is evaluated according to the current stack average cell voltage, and further includes: when the current cell stack average voltage is larger than a third preset voltage threshold and smaller than a fourth preset voltage threshold, determining that the service life of the fuel cell system reaches a prompt limit value, and sending out spare part prompt information, wherein the fourth preset voltage threshold is smaller than the second preset voltage threshold.
According to one embodiment of the present invention, the operation condition of the fuel cell system is evaluated according to the current stack average cell voltage, and further includes: when the current average single cell voltage of the galvanic pile is smaller than or equal to a third preset voltage threshold value, determining that the service life of the fuel cell system reaches a warning limit value, and sending out replacement warning information.
To achieve the above object, a second aspect of the present invention provides a computer-readable storage medium having stored thereon an operation evaluation program of a fuel cell system, which when executed by a processor, implements the operation evaluation method of the fuel cell system described in the above embodiments.
According to the computer readable storage medium, when the stored operation evaluation program of the fuel cell system is executed by the processor, the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell stack voltage is solved, the accuracy of operation evaluation of the fuel cell system is improved, a user timely adjusts the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, the service life of the fuel cell system is prolonged, and the user experience is improved.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides a fuel cell system including a memory, a processor, and an operation evaluation program of the fuel cell system stored on the memory and operable on the processor, the processor implementing the operation evaluation method of the fuel cell system described in the above embodiment when executing the operation evaluation program of the fuel cell system.
According to the fuel cell system provided by the embodiment of the invention, when the operation evaluation program of the fuel cell system stored in the memory is executed by the processor, the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell stack voltage is solved, the accuracy of operation evaluation of the fuel cell system is improved, a user timely adjusts the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, the service life of the fuel cell system is prolonged, and the user experience is improved.
To achieve the above object, a fourth aspect of the present invention provides an operation evaluation device of a fuel cell system, comprising: a first determination module for determining a determination power value of the fuel cell system; the acquisition module is used for acquiring the current electric pile average single cell voltage of the fuel cell system when the fuel cell system outputs the judgment power value; the second determining module is used for determining a voltage difference value between the current electric pile average single cell voltage and the electric pile average single cell voltage acquired last time; and the evaluation module is used for evaluating the operation condition of the fuel cell system according to the current average cell voltage of the electric pile when the voltage difference value is smaller than a first preset voltage threshold value.
According to the operation evaluation device of the fuel cell system, the judgment power value of the fuel cell system is determined through the first determination module, the current electric pile average single cell voltage of the fuel cell system is obtained when the fuel cell system outputs the judgment power value, the second determination module determines that the voltage difference between the current electric pile average single cell voltage and the electric pile average single cell voltage obtained last time and the evaluation module evaluates the operation condition of the fuel cell system according to the current electric pile average single cell voltage when the evaluation voltage difference is smaller than the first preset voltage threshold, the problem that the service life of the fuel cell system is inaccurate when the electric pile voltage is directly monitored is solved, the operation evaluation accuracy of the fuel cell system is improved, the service life of the fuel cell system is prolonged, and the user experience is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of an operation evaluation method of a fuel cell system according to an embodiment of the present application;
fig. 2 is a flowchart of an operation evaluation method of a fuel cell system according to an embodiment of the present application;
fig. 3 is a block schematic diagram of a fuel cell system according to one embodiment of the application;
fig. 4 is a block diagram schematically showing an operation evaluation apparatus of a fuel cell system according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
First, the present application has been made based on the knowledge and study of the following problems by the inventors:
the stack, an important component in a fuel cell system, is usually formed by connecting a plurality of single cells in series, and as the operating time of the stack increases, the performance of the catalyst activity, proton permeability of the proton exchange membrane, and the like in the single cells decrease. When the life of the stack is about to end, the stack cell voltage drop is significantly lower than its initial voltage and the maximum output power of the stack will be significantly reduced with the same power output from the fuel cell system.
In the related art, it is generally considered that the main evaluation index of the end of life of the fuel cell system is: the cell voltage is less than 10% -20% of the cell initial voltage. Therefore, the fuel cell system can be subjected to the down-line durability test according to the main evaluation criterion. In the actual use process, the user cannot perform the down-line endurance test on the fuel cell system according to the main evaluation standard, and the operation evaluation is performed on the fuel cell system mainly according to the maximum output power of the electric pile or the power performance condition of the vehicle.
In addition, since the life of the fuel cell system is greatly affected by working conditions, such as ambient temperature, pressure, the number of times of switching on and off, whether to drive violently, etc., the life of the fuel cell system simulated or tested before leaving the factory may be greater than that of the fuel cell system actually, and the operation condition of the fuel cell system cannot be effectively evaluated, so that a user is guided to take corresponding measures, thereby affecting the performance of the vehicle, causing difficulty in operation and even causing safety risks.
Therefore, in order to solve the problem that the service life of the fuel cell system cannot be accurately estimated, the application provides an operation estimation method of the fuel cell system, which estimates the operation condition of the fuel cell system according to the current average cell voltage when the fuel cell system outputs a judgment power value, so as to improve the accuracy of the operation estimation of the fuel cell system.
An operation evaluation method of a fuel cell system, a fuel cell system having the operation evaluation method, and an operation evaluation device of the fuel cell system according to embodiments of the present invention are described below with reference to the drawings.
Fig. 1 is a flowchart of an operation evaluation method of a fuel cell system according to an embodiment of the present invention. Referring to fig. 1, the operation evaluation method of the fuel cell system includes the steps of:
step S1, determining a judgment power value of the fuel cell system.
Specifically, the determination power value may be a common power value determined according to the idle power of the fuel cell system.
For example, the idle power of a 110kw fuel cell system is 15kw, and since the output power of the fuel cell system needs to be increased from the idle power value during the start-up process, the output power is generally from small to large, and the control strategy of the fuel cell system controls the output power value to be slightly higher than the idle power. Therefore, the determination power value of the fuel cell system is determined to be 30kw.
Step S2, when the fuel cell system outputs the judgment power value, the current electric pile average single cell voltage of the fuel cell system is obtained.
Specifically, when the fuel cell system outputs at the judgment power value, the average voltage of each cell pack is obtained in a preset period, and the current stack average cell voltage of the fuel cell system is obtained from the average voltage of each cell, and the current stack average voltage is stored.
For example, the average voltages Vn1, vn2, … …, vnN of the number 1 cells and the average voltages of the number N cells may be obtained within a preset period (e.g., 10 s), and the current stack average cell voltage of the fuel cell system may be obtained from the average voltage of each cell
Alternatively, in some embodiments of the present invention, obtaining a current stack average cell voltage of a fuel cell system includes: determining the voltage of each single cell, and calculating a first average voltage value according to the voltage of each single cell; obtaining a plurality of first average voltage values in a preset time period; and carrying out average value calculation on a plurality of first average voltage values in a preset time period to obtain the current average cell voltage of the electric pile.
Specifically, the sum of the voltages of the single cells is calculated according to the voltage of each single cell, and a first average voltage value is calculated according to the sum of the voltages of the single cells, so that the problem that working voltages are different due to different working conditions among the single cells of the electric pile is solved, a plurality of first average voltage values in a preset time period are obtained, and average calculation is carried out on the plurality of first average voltage values in the preset time period to obtain the current electric pile average single cell voltage.
For example, the voltages V1, V2, … …, VN of the 1# cell and V2 of the 2# cell may be determined at predetermined time intervals (e.g., 1 s), and the first average voltage value vm1=vm/N may be calculated from the sum vm=v1+v2+ … … +vn of the voltages of the cells, and the average value of the plurality of first average voltage values (e.g., 10) may be calculated for a predetermined time period (e.g., 10 s) to obtain the current stack average cell voltage
It should be noted that, by obtaining the current stack average cell voltage Of the fuel cell system, the problem that the current stack voltage Of the fuel cell system is inaccurate due to voltage abnormality (for example, voltage transient jump generated when the voltage detector detects the voltage Of the fuel cell system, voltage fluctuation caused by transient unstable operation Of the BOP (auxiliary equipment), overshoot Of the voltage during load change, etc.) can be eliminated, and the accuracy Of operation evaluation Of the fuel cell system is improved.
Step S3, determining a voltage difference value between the current electric pile average single cell voltage and the electric pile average single cell voltage acquired last time.
It should be noted that, the method of obtaining the average cell voltage of the stack at the last time is the same as the method of obtaining the average cell voltage of the current stack, and will not be described here again.
And S4, when the voltage difference value is smaller than a first preset voltage threshold value, evaluating the operation condition of the fuel cell system according to the current average cell voltage of the electric pile.
Specifically, when the voltage difference is smaller than a first preset voltage threshold, determining the operation condition of the fuel cell system according to the relation between the current average cell voltage of the electric pile and the corresponding preset voltage threshold and the relation between the actual working time of the current average cell voltage of the electric pile and the preset test time. The setting of the first preset voltage threshold may be set according to the actual situation of the fuel cell system, for example, 0.01V.
Further, in some embodiments of the present invention, evaluating the operation of the fuel cell system based on the current stack average cell voltage includes: when the current average single cell voltage of the electric pile is smaller than or equal to a second preset voltage threshold value, acquiring the actual working time of the fuel cell system, and judging whether the actual working time of the fuel cell system is smaller than a preset test time or not; if so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition; if not, the operating condition of the fuel cell system is determined to be normal.
It is understood that as the actual operating time of the fuel cell system increases, the current cell stack average cell voltage gradually becomes smaller, and when the current cell stack average cell voltage is equal to or less than a second preset voltage threshold (for example, 0.76V), the actual operating time of the fuel cell system (from when the fuel cell system is first put into use) is acquired, and it is determined whether the actual operating time of the fuel cell system is less than a preset test time (which can be determined by an offline durability test). If so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition; if not, the operating condition of the fuel cell system is determined to be normal.
That is, by comparing the time of the actual defect of the cell stack of the fuel cell system (actual working time) with the time of the test defect (preset test time), if the time of the actual defect of the cell stack of the fuel cell system is smaller than the time of the test defect, it is determined that the operation condition of the fuel cell system is bad, and the life of the fuel cell system is shorter than the life of the test, a prompt message for optimizing the operation condition needs to be sent; if the time of the actual electric pile loss of the fuel cell system is greater than or equal to the time of the test loss, determining that the operation working condition of the fuel cell system is normal, and the service life of the fuel cell system is longer than the service life of the test, and if the vehicle detection background determines that the time of the actual electric pile loss of the plurality of fuel cell systems is greater than or equal to the time of the test loss according to the acquired actual operation time of the plurality of fuel cell systems, determining that the second preset voltage threshold value in the operation evaluation method of the fuel cell system is set to be too large, and adjusting the second preset voltage threshold value.
Therefore, the operation condition of the fuel cell system can be reasonably estimated, and the control strategy of the operation estimation method of the fuel cell system can be adjusted according to the comparison condition, so that the accuracy of the operation estimation of the fuel cell system is improved.
In some embodiments of the invention, the evaluation of the operation of the fuel cell system according to the current stack average cell voltage further comprises: when the current cell stack average voltage is larger than a third preset voltage threshold and smaller than a fourth preset voltage threshold, determining that the service life of the fuel cell system reaches a prompt limit value, and sending out spare part prompt information, wherein the fourth preset voltage threshold is smaller than the second preset voltage threshold.
In some embodiments of the invention, the evaluation of the operation of the fuel cell system according to the current stack average cell voltage further comprises: when the current average single cell voltage of the galvanic pile is smaller than or equal to a third preset voltage threshold value, determining that the service life of the fuel cell system reaches a warning limit value, and sending out replacement warning information.
Specifically, when the current cell stack average voltage is larger than a third preset voltage threshold and smaller than a fourth preset voltage threshold, determining that the service life of the fuel cell system reaches a prompt limit value, and sending out spare part prompt information; when the current average single cell voltage of the galvanic pile is smaller than or equal to a third preset voltage threshold value, determining that the service life of the fuel cell system reaches a warning limit value, and sending out replacement warning information.
When the cell voltage is lower than 10% of the initial cell voltage, it is determined that the life of the fuel cell system is about to be exhausted. That is, when the current stack average cell voltage is lower than 10% of the initial cell voltage, it is also determined that the life of the fuel cell system is about to be exhausted. Thus, when the cell initial voltage is 0.8V, the third preset voltage threshold is 0.72V and the fourth preset voltage threshold is 0.74V.
Therefore, when the current average cell voltage of the electric pile is about to be reduced to the third preset voltage threshold, spare part prompt information is sent, and when the current average cell voltage of the electric pile is lower than the third preset voltage threshold, replacement warning information is sent to prompt a user of the service life condition of the fuel cell system, so that the user can replace the fuel cell system in time, and user experience is improved.
In summary, in the embodiment of the invention, by determining the judgment power value of the fuel cell system, and obtaining the current cell voltage of the fuel cell system when the fuel cell system outputs the judgment power value, and evaluating the operation condition of the fuel cell system according to the current cell voltage when the voltage difference between the current cell voltage and the last obtained cell voltage is smaller than the first preset voltage threshold, the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell voltage is solved, the accuracy of operation evaluation of the fuel cell system is improved, the use mode of the fuel cell is timely adjusted according to the operation evaluation condition of the fuel cell system by a user, the service life of the fuel cell system is prolonged, and the user experience is improved.
Optionally, in some embodiments of the present invention, when acquiring the current stack average cell voltage of the fuel cell system, the method further includes: judging whether a fault exists in the fuel cell system; if yes, discarding the current electric pile average single cell voltage; if not, the current stack average cell voltage is stored.
Specifically, when there is a fault in the fuel cell system (the fault code is issued), the current cell voltage is discarded regardless of the level of the fault, and the current cell voltage is stored until the fault of the fuel cell system is eliminated, in order to prevent erroneous determination of the fuel cell system.
Optionally, in some embodiments of the present invention, after determining the voltage difference between the current stack average cell voltage and the last acquired stack average cell voltage, the method further includes: and discarding the current average cell voltage of the electric pile when the voltage difference value is larger than or equal to a first preset voltage threshold value.
Specifically, when calculating the current cell voltage of the fuel cell system, if the voltage difference between the current cell voltage and the last acquired cell voltage is greater than or equal to a first preset voltage threshold (e.g., 0.01V), it may be determined that an abnormality in which the voltage decreases occurs in the fuel cell system as a whole, the current cell voltage is discarded, and if the abnormality persists for more than 10 minutes, the fuel cell system reports the abnormality to a vehicle detection background, so that a worker overhauls the fuel cell system in time.
In summary, according to the operation evaluation method of the fuel cell system according to the embodiment of the invention, by determining the judgment power value of the fuel cell system, and when the fuel cell system outputs the judgment power value, the current cell voltage of the fuel cell system is obtained only when the fuel cell system has no fault and the voltage difference is greater than or equal to the first preset voltage threshold, and when the voltage difference between the current cell voltage and the last obtained cell voltage is smaller than the first preset voltage threshold, the operation condition of the fuel cell system is evaluated according to the current cell voltage, thereby not only solving the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell voltage, but also improving the accuracy of detecting the current cell voltage of the fuel cell system, further improving the accuracy of operation evaluation of the fuel cell system, enabling a user to timely adjust the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, prolonging the service life of the fuel cell system, and improving the user experience.
Referring to fig. 2, in an embodiment of the present invention, a 110kw fuel cell system, a cell initial voltage of 0.8V is taken as an example, and the operation evaluation method of the fuel cell system includes the steps of:
In step S201, the fuel cell system is started, and the determination power value of the fuel cell system is determined to be 30kw.
In step S202, when the fuel cell system outputs the judgment power value, the current cell voltage of the fuel cell system is obtained.
Specifically, when the fuel cell system outputs 30kw and is maintained for 10s, the stack average cell voltage is recorded for 10s, and the time is counted again after the stack is full of 10 s.
Step S203, judging whether the fuel cell system has a fault or not during recording; if yes, go to step S210; if not, step S204 is performed.
Step S204, storing the current stack average cell voltage.
Step S205, judging that the voltage difference between the current cell voltage and the last obtained cell voltage is less than 0.01V, if yes, executing step S204 and step S206; if not, step S210 is performed.
In step S206, the actual operating time of the fuel cell system is obtained when the current stack average cell voltage is equal to or less than 0.76V.
Step S207, judging whether the actual working time of the fuel cell system is less than the preset test time, if so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition; if not, the operating condition of the fuel cell system is determined to be normal.
Step S208, when the current cell voltage of the galvanic pile is larger than 0.72V and smaller than 0.74V, determining that the service life of the fuel cell system reaches the prompt limit value, and sending out the spare part prompt information.
Step S209, when the current cell voltage is less than or equal to 0.72V, determining that the service life of the fuel cell system reaches the warning limit value, and sending out replacement warning information.
Step S210, discarding the current stack average cell voltage.
In summary, according to the operation evaluation method of the fuel cell system in the embodiment of the invention, by determining the judgment power value of the fuel cell system, and when the fuel cell system outputs the judgment power value, the current cell stack average cell voltage of the fuel cell system is obtained, and when the voltage difference between the current cell stack average cell voltage and the last obtained cell stack average cell voltage is smaller than the first preset voltage threshold, the operation condition of the fuel cell system is evaluated according to the current cell stack average cell voltage, thereby solving the problem of inaccurate evaluation of the service life of the fuel cell system by directly monitoring the cell stack voltage, improving the accuracy of operation evaluation of the fuel cell system, enabling a user to timely adjust the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, prolonging the service life of the fuel cell system, and improving the user experience.
In accordance with the above-described embodiments, the present invention also proposes a computer-readable storage medium having stored thereon an operation evaluation program of a fuel cell system, which when executed by a processor, implements the operation evaluation method of the fuel cell system described in the above-described embodiments.
According to the computer readable storage medium, when the stored operation evaluation program of the fuel cell system is executed by the processor, the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell stack voltage is solved, the accuracy of operation evaluation of the fuel cell system is improved, a user timely adjusts the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, the service life of the fuel cell system is prolonged, and the user experience is improved.
Fig. 3 is a block schematic diagram of a fuel cell system according to one embodiment of the invention. Referring to fig. 3, the fuel cell system 30 includes a memory 301, a processor 302, and an operation evaluation program of the fuel cell system stored in the memory and operable on the processor, and when the processor 302 executes the operation evaluation program of the fuel cell system, the operation evaluation method of the fuel cell system described in the above embodiment is implemented.
According to the fuel cell system provided by the embodiment of the invention, when the operation evaluation program of the fuel cell system stored in the memory is executed by the processor, the problem of inaccurate service life evaluation of the fuel cell system by directly monitoring the cell stack voltage is solved, the accuracy of operation evaluation of the fuel cell system is improved, a user timely adjusts the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, the service life of the fuel cell system is prolonged, and the user experience is improved.
Fig. 4 is a block diagram schematically showing an operation evaluation apparatus of a fuel cell system according to an embodiment of the present invention. Referring to fig. 4, the operation evaluation device 40 includes: a first determining module 401 for determining a judgment power value of the fuel cell system; an obtaining module 402, configured to obtain a current stack average cell voltage of the fuel cell system when the fuel cell system outputs the determined power value; a second determining module 403, configured to determine a voltage difference between the current stack average cell voltage and the last acquired stack average cell voltage; and the evaluation module 404 is configured to evaluate the operation condition of the fuel cell system according to the current average cell voltage of the stack when the voltage difference is less than the first preset voltage threshold.
According to one embodiment of the invention, the obtaining module 402, configured to obtain a current stack average cell voltage of the fuel cell system, includes: determining the voltage of each single cell, and calculating a first average voltage value according to the voltage of each single cell; obtaining a plurality of first average voltage values in a preset time period; and carrying out average value calculation on a plurality of first average voltage values in a preset time period to obtain the current average cell voltage of the electric pile.
According to one embodiment of the present invention, the obtaining module 402 is configured to, when obtaining the current stack average cell voltage of the fuel cell system, further include: judging whether a fault exists in the fuel cell system; if yes, discarding the current electric pile average single cell voltage; if not, the current stack average cell voltage is stored.
According to one embodiment of the present invention, the obtaining module 402 is configured to, after determining a voltage difference between the current cell voltage and the last obtained cell voltage, further include: and discarding the current average cell voltage of the electric pile when the voltage difference value is larger than or equal to a first preset voltage threshold value.
According to one embodiment of the invention, the evaluation module 404, configured to evaluate the operation of the fuel cell system according to the current average cell voltage of the stack, includes: when the current average single cell voltage of the electric pile is smaller than or equal to a second preset voltage threshold value, acquiring the actual working time of the fuel cell system, and judging whether the actual working time of the fuel cell system is smaller than a preset test time or not; if so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition; if not, the operating condition of the fuel cell system is determined to be normal.
According to one embodiment of the present invention, the evaluation module 404 is configured to evaluate the operation condition of the fuel cell system according to the current average cell voltage of the stack, and further includes: when the current cell stack average voltage is larger than a third preset voltage threshold and smaller than a fourth preset voltage threshold, determining that the service life of the fuel cell system reaches a prompt limit value, and sending out spare part prompt information, wherein the fourth preset voltage threshold is smaller than the second preset voltage threshold.
According to one embodiment of the present invention, the evaluation module 404 is configured to evaluate the operation condition of the fuel cell system according to the current average cell voltage of the stack, and further includes: when the current average single cell voltage of the galvanic pile is smaller than or equal to a third preset voltage threshold value, determining that the service life of the fuel cell system reaches a warning limit value, and sending out replacement warning information.
Note that, for the description of the operation evaluation device of the fuel cell system, reference may be made to the foregoing description of the operation evaluation method of the fuel cell system, and the description will not be repeated here.
According to the operation evaluation device of the fuel cell system, the judgment power value of the fuel cell system is determined through the first determination module, the current electric pile average single cell voltage of the fuel cell system is obtained when the fuel cell system outputs the judgment power value, the second determination module determines that the voltage difference between the current electric pile average single cell voltage and the electric pile average single cell voltage obtained last time and the evaluation module evaluates the operation condition of the fuel cell system according to the current electric pile average single cell voltage when the evaluation voltage difference is smaller than the first preset voltage threshold, the problem that the service life of the fuel cell system is inaccurate when the electric pile voltage is directly monitored is solved, the operation evaluation accuracy of the fuel cell system is improved, the service life of the fuel cell system is prolonged, and the user experience is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, as used in embodiments of the present invention, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying any particular number of features in the present embodiment. Thus, a feature of an embodiment of the invention that is defined by terms such as "first," "second," etc., may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present invention, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly defined otherwise in the embodiments.
In the present invention, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific embodiments.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It should be noted that the technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. An operation evaluation method of a fuel cell system, characterized by comprising:
determining a determination power value of the fuel cell system;
when the fuel cell system outputs the judging power value, acquiring the current electric pile average single cell voltage of the fuel cell system;
determining a voltage difference value between the current electric pile average single cell voltage and the electric pile average single cell voltage acquired last time;
and when the voltage difference is smaller than a first preset voltage threshold, evaluating the operation condition of the fuel cell system according to the current average cell voltage of the electric pile.
2. The operation evaluation method of a fuel cell system according to claim 1, wherein obtaining a current stack average cell voltage of the fuel cell system comprises:
determining the voltage of each single cell, and calculating a first average voltage value according to the voltage of each single cell;
obtaining a plurality of first average voltage values in a preset time period;
and carrying out average calculation on the plurality of first average voltage values in the preset time period to obtain the current electric pile average single cell voltage.
3. The operation evaluation method of a fuel cell system according to claim 1 or 2, characterized in that when acquiring a current cell voltage of the fuel cell system, the method further comprises:
judging whether the fuel cell system has a fault or not;
if yes, discarding the current electric pile average single cell voltage;
and if not, storing the current electric pile average single cell voltage.
4. The operation evaluation method of a fuel cell system according to claim 1 or 2, characterized in that after determining a voltage difference between the current cell voltage and the last acquired cell voltage, the method further comprises:
And discarding the current average cell voltage when the voltage difference value is greater than or equal to a first preset voltage threshold value.
5. The operation evaluation method of a fuel cell system according to claim 1 or 2, characterized in that evaluating the operation condition of the fuel cell system according to the current stack average cell voltage comprises:
when the current cell stack average single cell voltage is smaller than or equal to a second preset voltage threshold value, acquiring the actual working time of the fuel cell system, and judging whether the actual working time of the fuel cell system is smaller than a preset test time or not;
if so, determining that the operation condition of the fuel cell system is bad, and sending out prompt information for optimizing the operation condition;
if not, determining that the operation condition of the fuel cell system is normal.
6. The operation evaluation method of a fuel cell system according to claim 5, wherein the operation condition of the fuel cell system is evaluated based on the current stack average cell voltage, further comprising:
when the current cell stack average cell voltage is larger than a third preset voltage threshold and smaller than a fourth preset voltage threshold, determining that the service life of the fuel cell system reaches a prompt limit value, and sending out a spare part prompt message, wherein the fourth preset voltage threshold is smaller than the second preset voltage threshold.
7. The operation evaluation method of a fuel cell system according to claim 6, wherein the operation condition of the fuel cell system is evaluated based on the current stack average cell voltage, further comprising:
and when the current cell voltage of the current cell stack is smaller than or equal to a third preset voltage threshold, determining that the service life of the fuel cell system reaches a warning limit value, and sending out replacement warning information.
8. A computer-readable storage medium, characterized in that an operation evaluation program of a fuel cell system is stored thereon, which when executed by a processor, implements the operation evaluation method of a fuel cell system according to any one of claims 1 to 7.
9. A fuel cell system comprising a memory, a processor, and an operation evaluation program of the fuel cell system stored on the memory and operable on the processor, the processor implementing the operation evaluation method of the fuel cell system according to any one of claims 1 to 7 when executing the operation evaluation program of the fuel cell system.
10. An operation evaluation device of a fuel cell system, characterized by comprising:
A first determining module configured to determine a determination power value of the fuel cell system;
an obtaining module, configured to obtain a current cell stack average voltage of the fuel cell system when the fuel cell system outputs the determined power value;
a second determining module, configured to determine a voltage difference between the current stack average cell voltage and a last acquired stack average cell voltage;
and the evaluation module is used for evaluating the operation condition of the fuel cell system according to the current average single cell voltage of the galvanic pile when the voltage difference value is smaller than a first preset voltage threshold value.
CN202210270927.1A 2022-03-18 2022-03-18 Fuel cell system, operation evaluation method, evaluation device, and storage medium Pending CN116799264A (en)

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