CN111413627A - Fuel cell service life prediction method and device based on volt-ampere curve - Google Patents
Fuel cell service life prediction method and device based on volt-ampere curve Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a prediction method and a prediction device of the service life of a fuel cell based on a volt-ampere curve, wherein the method comprises the following steps: activating the fuel cell to be tested, acquiring a polarization curve of an initial state, and determining a service life end point according to the percentage of voltage attenuation; the method comprises the steps that a fuel cell to be tested operates within preset time, and a current polarization curve of the fuel cell is obtained; and acquiring a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determining the service life and the residual life of the fuel cell by utilizing the transverse flexibility and the life end point of the volt-ampere curve of the fuel cell. The method utilizes the transverse flexibility of the voltammetry curve in the aging process of the fuel cell, reduces the detection time, simplifies the detection process, and has the advantages of better accuracy and the like.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell service life prediction method and device based on a volt-ampere curve.
Background
The fuel cell, as a novel energy form, will play an important role in the national energy saving and emission reduction process. The major limitations to current fuel cell development are cost and lifetime. Therefore, the life of the fuel cell needs to be evaluated.
The existing fuel cell life prediction methods include, but are not limited to, the following: obtaining a fitting formula through experimental data simulation for prediction; obtained by performing a steady state experiment in a laboratory; the method comprises the following steps of operating under different working conditions in a laboratory and obtaining a corresponding life prediction formula; and loading the fuel cell into a vehicle to perform real vehicle operation. However, in the above methods, the prediction time length and the applicable range are narrow in some cases.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for predicting the service life of a fuel cell based on a voltammetry curve, which reduces the time taken for detection, simplifies the detection process, and has the advantages of better accuracy, etc.
Another object of the present invention is to provide a device for predicting the service life of a fuel cell based on a voltammetry curve.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for predicting the service life of a fuel cell based on a voltammetry curve, which includes the following steps: step S1, activating the fuel cell to be tested, obtaining the polarization curve of the initial state, and determining the end point of the service life according to the percentage of voltage attenuation; step S2, the fuel cell to be tested is enabled to operate within a preset time, and the current polarization curve of the fuel cell is obtained; and step S3, acquiring a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determining the service life of the fuel cell by using the transverse flexibility of the volt-ampere curve of the fuel cell and the service life end point.
The prediction method of the service life of the fuel cell based on the voltammetry curve, disclosed by the embodiment of the invention, utilizes the transverse flexibility of the voltammetry curve in the aging process of the fuel cell, reduces the detection time, simplifies the detection process and has better accuracy.
In addition, the method for predicting the service life of the fuel cell based on the voltammetry curve according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, after the polarization curve of the initial state is obtained in the step S1, a target point is determined on the polarization curve of the initial state, and a voltage and a current corresponding to the target point are obtained.
Further, in an embodiment of the present invention, after the current polarization curve of the fuel cell is obtained in step S2, a new target point is obtained on the current polarization curve of the fuel cell according to the voltage value determined in step S1, and a current value corresponding to the new target point is determined.
Further, in an embodiment of the present invention, the prediction formula of the lateral flexibility of the voltammetry curve of the fuel cell is as follows:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere graphs of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Current ofValue, get tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
Alternatively, in one embodiment of the invention, the fuel cell under test comprises a proton exchange membrane fuel cell, a direct methanol fuel cell and a solid oxide fuel cell.
In order to achieve the above object, another embodiment of the present invention provides a device for predicting the service life of a fuel cell based on a voltammetry curve, including: the first acquisition module is used for activating the fuel cell to be tested, acquiring a polarization curve of an initial state and determining a service life end point according to the percentage of voltage attenuation; the second acquisition module is used for enabling the fuel cell to be tested to operate within preset time and acquiring the current polarization curve of the fuel cell; and the prediction module is used for acquiring a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determining the service life of the fuel cell by utilizing the transverse flexibility of the volt-ampere curve of the fuel cell and the service life end point.
The prediction device for the service life of the fuel cell based on the voltammetry curves, disclosed by the embodiment of the invention, utilizes the transverse flexibility of the voltammetry curves in the aging process of the fuel cell, reduces the detection time, simplifies the detection process and has better accuracy.
In addition, the prediction device for the service life of the fuel cell based on the voltammogram according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the first obtaining module is further configured to: and determining a target point on the polarization curve in the initial state, and acquiring the voltage and the current corresponding to the target point.
Further, in an embodiment of the present invention, the second obtaining module is further configured to: and acquiring a new target point on the current polarization curve of the fuel cell according to the voltage value determined in the first acquisition module, and determining a current value corresponding to the new target point.
Further, in an embodiment of the present invention, the prediction formula of the lateral flexibility of the voltammetry curve of the fuel cell is as follows:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere graphs of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Obtaining the current value of tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell,including an initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
Alternatively, in one embodiment of the invention, the fuel cell under test comprises a proton exchange membrane fuel cell, a direct methanol fuel cell and a solid oxide fuel cell.
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
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for predicting the useful life of a fuel cell based on voltammetry curves, according to an embodiment of the invention;
FIG. 2 is a graph of t of a method for predicting the useful life of a fuel cell based on voltammogram according to an embodiment of the present invention0A schematic voltammogram;
FIG. 3 is a t of a method for predicting the lifetime of a fuel cell based on voltammograms, according to an embodiment of the present inventionpA schematic voltammogram;
fig. 4 is a schematic structural diagram of a device for predicting the service life of a fuel cell based on a voltammogram according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Hereinafter, a method and an apparatus for predicting the lifespan of a fuel cell based on a voltammogram according to an embodiment of the present invention will be described with reference to the accompanying drawings, and first, a method for predicting the lifespan of a fuel cell based on a voltammogram according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method for predicting the service life of a fuel cell based on voltammetry curves according to an embodiment of the invention.
As shown in fig. 1, the method for predicting the service life of a fuel cell based on a voltammogram includes the following steps:
in step S1, the fuel cell under test is activated, a polarization curve of the initial state is obtained, and the end of life is determined according to the percentage of voltage decay.
It will be understood that t in FIGS. 2 and 30The line represents the polarization curve of the initial state, V0The end-of-life voltage V can be determined for the initial voltage based on a certain percentage of decaye. The person skilled in the art can determine the percentage of attenuation according to the actual situation, which is not limited in particular.
It should be noted that, in the embodiment of the present invention, the fuel cell is first activated. If abnormal phenomena such as performance degradation occur during activation, the fuel cell needs to be replaced with a new one and the activation is performed again. The combustion battery to be tested can comprise a proton exchange membrane fuel cell, a direct methanol fuel cell and a solid oxide fuel cell.
Further, in an embodiment of the present invention, after the polarization curve in the initial state is obtained in step S1, a target point is determined on the polarization curve in the initial state, and a voltage and a current corresponding to the target point are obtained.
In step S2, the fuel cell to be tested is operated within a preset time, and the current polarization curve of the fuel cell is obtained.
As shown in fig. 2 and 3, tpThe line represents the polarization curve of the fuel cell after a predetermined period of operation, and the fuel is obtained in step S2After the current polarization curve of the fuel cell, according to the voltage value determined in step S1, a new target point is obtained from the current polarization curve of the fuel cell, and a current value corresponding to the new target point is determined.
In step S3, a corresponding voltage-time curve is obtained based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and the service life of the fuel cell is determined by using the lateral scalability and the end-of-life of the voltammetry curve of the fuel cell.
Further, the prediction formula of the transverse flexibility of the fuel cell voltammetry curve is as follows:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including the initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an I-V coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Obtaining the current value of tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including the initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an I-V coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
Specifically, the lateral flexibility prediction formula of the fuel cell voltammetry curve is calculated as: equation (1) two voltammograms of the fuel cell are plotted against the two polarization curves, including the initial t0Curve of time and elapsed time tpThe curve of (d); then, at t0Determining a corresponding V on the curve0Current of voltage IbAt tpDetermining the corresponding current I on the curvebVoltage V ofpAt t0Determining a corresponding voltage V on the curvepPoint P (I)p,Vp) (ii) a With O (0, V)0) And O (I)b,V0) As an origin, satisfies O (0, V)0) And P (t)p,Vp) The "t-V" coordinate system is plotted. Then t0The part of the volt-ampere curve in a t-V coordinate system can be used as a change track of voltage along with time, and the point corresponding to the end-of-life voltage is the service life t of the fuel cellfc. Equation (2) corresponds to: because of t0Voltammetric curves and tpThe curve has a transverse expansion characteristic, so t can be adjustedpConverting the voltammetry curve into a voltage change curve, and drawing two voltammetry curves of the fuel cell according to the two acquired polarization curves, including initial t0Curve of time and elapsed time tpThe curve of (d); then, at t0Determining a corresponding V on the curve0Current of voltage IbAt tpDetermining the corresponding current I on the curvebVoltage V ofpAt t0Determining a corresponding voltage V on the curvepPoint P (t)p,Vp) (ii) a With O (0, V)0) And O (I)a,V0) As an origin, satisfies O (0, V)0) And P (I)b,Vp) The "t-V" coordinate system is plotted. Then tpThe part of the volt-ampere curve in a t-V coordinate system can be used as a change track of voltage along with time, and the point corresponding to the end-of-life voltage is the service life t of the fuel cellfc。
According to the prediction method of the service life of the fuel cell based on the voltammetry curve, which is provided by the embodiment of the invention, the transverse flexibility of the voltammetry curve in the aging process of the fuel cell is utilized, the detection time is reduced, the detection process is simplified, and the method has the advantages of better accuracy and the like.
Next, a device for predicting the service life of a fuel cell based on a voltammogram according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 4 is a schematic structural diagram of a fuel cell life prediction device based on voltammograms according to an embodiment of the present invention.
As shown in fig. 4, the apparatus 10 includes: a first acquisition module 100, a second acquisition module 200, and a prediction module 300.
The first obtaining module 100 is configured to activate a fuel cell to be tested, obtain a polarization curve in an initial state, and determine a lifetime end point according to a percentage of voltage attenuation. The fuel cell to be tested can comprise a proton exchange membrane fuel cell, a direct methanol fuel cell and a solid oxide fuel cell.
Further, in an embodiment of the present invention, the first obtaining module 100 is further configured to: and determining a target point on the polarization curve in the initial state, and acquiring the voltage and the current corresponding to the target point.
The second obtaining module 200 is configured to enable the fuel cell to be tested to operate within a preset time, and obtain a current polarization curve of the fuel cell.
Further, in an embodiment of the present invention, the second obtaining module 200 is further configured to: and acquiring a new target point on the current polarization curve of the fuel cell according to the voltage value determined in the first acquisition module, and determining a current value corresponding to the new target point.
The prediction module 300 is configured to obtain a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determine the service life of the fuel cell by using the lateral scalability and the end-of-life node of the voltammetry curve of the fuel cell.
Further, in one embodiment of the present invention, the prediction formula of the lateral elasticity of the fuel cell voltammetry curve is:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including the initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an I-V coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Obtaining the current value of tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including the initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an I-V coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
It should be noted that the foregoing explanation of the embodiment of the method for predicting the service life and the remaining life of the fuel cell is also applicable to the device for predicting the service life and the remaining life of the fuel cell of this embodiment, and will not be described herein again.
According to the prediction device for the service life of the fuel cell based on the voltammetry curve, which is provided by the embodiment of the invention, the transverse flexibility of the voltammetry curve in the aging process of the fuel cell is utilized, the detection time is reduced, the detection process is simplified, and the accuracy is better.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A prediction method of the service life of a fuel cell based on a voltammetry curve is characterized by comprising the following steps:
step S1, activating the fuel cell to be tested, obtaining the polarization curve of the initial state, and determining the end point of the service life according to the percentage of voltage attenuation;
step S2, the fuel cell to be tested is enabled to operate within a preset time, and the current polarization curve of the fuel cell is obtained; and
and step S3, acquiring a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determining the service life of the fuel cell by using the transverse flexibility of the volt-ampere curve of the fuel cell and the service life end point.
2. The method for predicting the service life of a fuel cell according to claim 1, wherein after the polarization curve of the initial state is obtained in step S1, a target point is determined on the polarization curve of the initial state, and the voltage and the current corresponding to the target point are obtained.
3. The method for predicting the service life of a fuel cell according to claim 1, wherein after the current polarization curve of the fuel cell is obtained in step S2, a voltage value is determined in step S1, a new target point is obtained on the current polarization curve of the fuel cell, and a current value corresponding to the new target point is determined.
4. The voltammetry-based fuel cell service life prediction method of claim 1, wherein the fuel cell voltammetry lateral scalability prediction formula is:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere graphs of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, includingInitial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Obtaining the current value of tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
5. The method for predicting the service life of the fuel cell based on the voltammetry curves as in any one of claims 1-4, wherein the fuel cell under test comprises a proton exchange membrane fuel cell, a direct methanol fuel cell and a solid oxide fuel cell.
6. A device for predicting the service life of a fuel cell based on a voltammogram, comprising:
the first acquisition module is used for activating the fuel cell to be tested, acquiring a polarization curve of an initial state and determining a service life end point according to the percentage of voltage attenuation;
the second acquisition module is used for enabling the fuel cell to be tested to operate within preset time and acquiring the current polarization curve of the fuel cell; and
and the prediction module is used for acquiring a corresponding voltage-time curve based on the polarization curve of the initial state and the current polarization curve of the fuel cell, and determining the service life of the fuel cell by utilizing the transverse flexibility of the volt-ampere curve of the fuel cell and the service life end point.
7. The voltammetry based fuel cell life prediction device of claim 6 wherein said first acquisition module is further configured to:
and determining a target point on the polarization curve in the initial state, and acquiring the voltage and the current corresponding to the target point.
8. The voltammetry based fuel cell life prediction device of claim 6, wherein said second acquisition module is further configured to:
and acquiring a new target point on the current polarization curve of the fuel cell according to the voltage value determined in the first acquisition module, and determining a current value corresponding to the new target point.
9. The voltammetry based fuel cell service life prediction device of claim 6, wherein the fuel cell voltammetry lateral expansion prediction formula is:
wherein, the formula (1) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere graphs of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpSo that the two voltammograms lie in the "I-V" range "A coordinate system, wherein t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IbIs t0Corresponding V on curve0Obtaining the current value of tpCorresponding on the curve IbVoltage value of (1), thenpIs t0The current value corresponding to the current voltage value on the curve; the formula (2) has definite meaning only by matching with a corresponding coordinate system, and two volt-ampere curves of the fuel cell are drawn according to the polarization curve of the initial state and the current polarization curve of the fuel cell, including initial t0Curve of time and elapsed time tpThe two voltammograms are positioned in an 'I-V' coordinate system, t is the using time of the fuel cell to be tested, I is the current of the fuel cell to be tested, V is the voltage of the fuel cell to be tested, and an initial reference voltage V is taken0Then, IaIs tpCorresponding V on curve0Current value of (I)bIs t0Corresponding V on curve0The current value of (1).
10. The voltammetry-based fuel cell service life prediction device according to any of claims 6-9, wherein the fuel cell under test comprises a proton exchange membrane fuel cell, a direct methanol fuel cell, and a solid oxide fuel cell.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114137431A (en) * | 2021-11-19 | 2022-03-04 | 中国科学院大连化学物理研究所 | Fuel cell service life prediction method suitable for cycle working condition |
| CN114487843A (en) * | 2021-12-21 | 2022-05-13 | 清华大学 | Life prediction method and device based on fuel cell polarization curve change rule |
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