CN114335613A - Fuel cell purging control method and device based on DRT analysis - Google Patents
Fuel cell purging control method and device based on DRT analysis Download PDFInfo
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Abstract
The invention provides a fuel cell purging control method and a fuel cell purging control device based on DRT analysis.A DRT analysis is carried out on an electrochemical impedance spectrum of a fuel cell system in a cold storage state after the fuel cell system is shut down, and low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system are obtained; correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value; and storing the new first impedance target value and the new second impedance target value to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before next shutdown, and realizing cold purging dynamic closed loop of the fuel cell based on an optimized purging criterion, reducing the cold storage icing risk, improving the cold start performance of the stack, and improving the durability and the service life of the fuel cell.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell purging control method and device based on DRT analysis.
Background
After the fuel cell system is shut down, water produced during operation and humidified water may remain inside the system, which is disadvantageous for the next start-up, and particularly when the ambient temperature during the shut-down is lowered below zero, the water inside may freeze, causing freezing of parts, flow passages, diffusion layers, and the like, leading to a failed start-up and damage of the parts, so the purge operation is generally performed at the time of the shut-down.
Most of the purging modes in the prior art are simple purging, some purging strategies only consider the high-frequency impedance of the fuel cell to realize closed-loop purging, the internal impedance condition of the galvanic pile in the cold storage stage is not monitored, purging is not thorough, the risk of icing of the galvanic pile in the low-temperature storage state is increased, and the service life of the fuel cell is further influenced.
Therefore, how to further improve the purging effect when the fuel cell system is shut down and improve the durability of the fuel cell system is a technical problem to be solved at present.
Disclosure of Invention
The invention discloses a fuel cell purging control method based on DRT analysis, which is used for solving the technical problem of poor purging effect when a fuel cell system is shut down in the prior art. The method comprises the following steps:
when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system and acquiring a first intermediate-frequency impedance and a first high-frequency impedance of the fuel cell system in real time;
purging the fuel cell system and ending the purging when the first intermediate frequency impedance reaches a first impedance target value and the first high frequency impedance reaches a second impedance target value;
shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system;
correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value;
saving the new first impedance target value and the new second impedance target value to purge the fuel cell system before the next shutdown according to the new first impedance target value and the new second impedance target value.
In some embodiments of the present application, after shutting down the fuel cell system, the method further comprises:
supplying power to the fuel cell system through the standby power cell, and applying an alternating current disturbance signal to the fuel cell system based on the DC/DC converter;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
the anode and the cathode of the standby power battery are respectively connected with the first end and the second end of the DC/DC converter, and the third end and the fourth end of the DC/DC converter are respectively connected with the anode and the cathode of the fuel cell system.
In some embodiments of the present application, after purging the fuel cell system, the method further comprises:
and if the purging duration reaches the preset maximum duration, ending purging.
In some embodiments of the present application, the method further comprises:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
In some embodiments of the present application, after obtaining the low frequency impedance, the second mid frequency impedance, and the second high frequency impedance of the fuel cell system, the method further comprises:
and if the low-frequency impedance is smaller than the first lowest impedance, the second intermediate-frequency impedance is smaller than the second lowest impedance, and the second high-frequency impedance is smaller than the third lowest impedance, reducing the purging flow and/or the preset maximum time length when the fuel cell system is purged before next shutdown.
Correspondingly, the invention also provides a fuel cell purging control device based on DRT analysis, which comprises:
the electrochemical impedance spectrum acquisition module is used for acquiring an electrochemical impedance spectrum of the fuel cell system;
the DRT analysis module is used for carrying out DRT analysis on the electrochemical impedance spectrum of the fuel cell system;
the purging module is used for purging the fuel cell system;
the storage module is used for storing DRT analysis results;
a controller to:
when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system based on the DRT analysis module, and acquiring a first medium-frequency impedance and a first high-frequency impedance of the fuel cell system in real time;
purging the fuel cell system based on the purge module and ending the purging when the first intermediate frequency impedance reaches a first impedance target value and the first high frequency impedance reaches a second impedance target value;
shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state based on the DRT analysis module, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system;
correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value;
and saving the new first impedance target value and the new second impedance target value to the storage module so as to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before next shutdown.
In some embodiments of the present application, the electrochemical impedance spectroscopy acquisition module comprises a DC/DC converter and a backup power cell, and the controller is further configured to:
after the fuel cell system is shut down, supplying power to the fuel cell system through the standby power cell, and applying an alternating current disturbance signal to the fuel cell system based on the DC/DC converter;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
the anode and the cathode of the standby power battery are respectively connected with the first end and the second end of the DC/DC converter, and the third end and the fourth end of the DC/DC converter are respectively connected with the anode and the cathode of the fuel cell system.
In some embodiments of the present application, the controller is further configured to:
and after purging the fuel cell system, if the purging duration reaches the preset maximum duration, ending purging.
In some embodiments of the present application, the controller is further configured to:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
In some embodiments of the present application, the controller is further configured to:
and if the low-frequency impedance is smaller than the first lowest impedance, the second intermediate-frequency impedance is smaller than the second lowest impedance, and the second high-frequency impedance is smaller than the third lowest impedance, reducing the purging flow and/or the preset maximum time length when the fuel cell system is purged before next shutdown.
By applying the technical scheme, when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system and acquiring a first medium-frequency impedance and a first high-frequency impedance of the fuel cell system in real time; purging the fuel cell system and ending the purging when the first intermediate-frequency impedance reaches a first impedance target value and the first high-frequency impedance reaches a second impedance target value; shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system; correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value; and storing the new first impedance target value and the new second impedance target value to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before next shutdown, and realizing cold purging dynamic closed loop of the fuel cell based on an optimized purging criterion, reducing the cold storage icing risk, improving the cold start performance of the stack, and improving the durability and the service life of the fuel cell.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
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The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 shows a schematic flow diagram illustrating a fuel cell purge control method based on DRT analysis in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a fuel cell purge control apparatus based on DRT analysis in an embodiment of the present application;
fig. 3 shows a schematic diagram of the electrochemical impedance spectroscopy acquisition module in the embodiment of the present application.
In fig. 2 and 3, 100, an electrochemical impedance spectroscopy acquisition module; 200. a DRT analysis module; 300. a purge module; 400. a storage module; 500. a controller; 600. a fuel cell system; 610. an anode; 620. a cathode; 630. a gas diffusion layer; 640. a catalytic layer; 650. a proton exchange membrane; 110. a DC/DC converter; 120. and (5) a standby power battery.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
The embodiment of the application provides a fuel cell purging control method based on DRT analysis, which is used for dynamically evaluating the icing state inside a galvanic pile and correcting purging criteria based on low, medium and high frequency impedance identification results in a cold storage stage after shutdown, so that the icing risk of the galvanic pile in a low-temperature storage state is reduced, the cold start performance of the galvanic pile is improved, and the durability and the service life of the fuel cell are improved. As shown in fig. 1, the method comprises the steps of:
step S101, when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system and acquiring a first intermediate frequency impedance and a first high frequency impedance of the fuel cell system in real time.
In this embodiment, the fuel cell system is an electrochemical reaction device, hydrogen and oxygen react on both sides of a proton exchange membrane in a stack, and water is generated on an air side to convert chemical energy into electric energy, and the fuel cell system mainly includes a fuel cell stack, an air subsystem, a hydrogen subsystem, and a cooling subsystem.
Electrochemical Impedance Spectroscopy (EIS) is an Electrochemical diagnostic and analytical tool for efficient in situ/ex situ Electrochemical characterization. The electrochemical impedance spectrum can be obtained by an electrochemical impedance measurement technology, and particularly, a tiny current or voltage disturbance signal is applied to the fuel cell system to realize the measurement of the impedance.
DRT (Distribution of Relaxation Time, Relaxation Time Distribution) is an EIS analysis technique that does not rely on prior knowledge of the study subject and can be used to separate and analyze highly overlapping physicochemical processes in EIS. The DRT analysis can obtain the low-frequency impedance, the medium-frequency impedance and the high-frequency impedance of the fuel cell system, and the high-frequency impedance can be equivalent to a proton transfer process and is commonly used for representing the water content in the proton exchange membrane; the medium-frequency impedance is equivalent to an oxidation-reduction process and can be used for representing the water content of the Catalytic Layer (CL); the low-frequency impedance is equivalent to a gas diffusion process, the water content in a Gas Diffusion Layer (GDL) is mainly characterized, and the impedance measurement of low, medium and high frequencies needs time to be shortened in sequence. In a specific application scenario of the present application, as shown in fig. 3, a gas diffusion layer 630, a catalytic layer 640 and a proton exchange membrane 650 are included between an anode 610 and a cathode 620 of a fuel cell system 600.
When a shutdown command sent by a user is received, performing DRT analysis on the electrochemical impedance spectrum of the fuel cell system, wherein the low-frequency impedance is not acquired but the first intermediate-frequency impedance and the first high-frequency impedance of the fuel cell system are acquired in real time for improving efficiency due to the fact that the low-frequency impedance is acquired for a long time.
Step S102, purging the fuel cell system, and finishing purging when the first intermediate-frequency impedance reaches a first impedance target value and the first high-frequency impedance reaches a second impedance target value.
In this embodiment, the fuel cell system is purged, the first impedance target value and the second impedance target value are used as a purge closed loop criterion during the purge, and the purge is terminated when the first intermediate frequency impedance reaches the first impedance target value and the first high frequency impedance reaches the second impedance target value.
To ensure reliability, in some embodiments of the present application, after purging the fuel cell system, the method further comprises:
and if the purging duration reaches the preset maximum duration, ending purging.
In this embodiment, if the purging duration reaches the preset maximum duration, which indicates that the purging time is too long, even if the first intermediate-frequency impedance does not reach the first impedance target value or the first high-frequency impedance does not reach the second impedance target value, the purging is terminated.
Step S103, the fuel cell system is shut down, the electrochemical impedance spectrum of the fuel cell system in a cold storage state is subjected to DRT analysis, and the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance of the fuel cell system are obtained.
In this embodiment, after purging is completed, the fuel cell system is shut down, the fuel cell system enters a cold storage state, and since the fuel cell system may freeze in the cold storage state, the internal impedance changes, and at this time, DRT analysis is performed again on the electrochemical impedance spectrum of the fuel cell system in the cold storage state, and the low-frequency impedance, the second intermediate-frequency impedance, and the second high-frequency impedance of the fuel cell system are obtained.
It is understood that the person skilled in the art can flexibly adjust the acquisition sequence of the three impedances according to actual needs, which does not affect the scope of the present application.
In order to reliably obtain the electrochemical impedance spectrum when the fuel cell system is in the cold storage state, in some embodiments of the present application, after the fuel cell system is shut down, the method further includes:
supplying power to the fuel cell system through the standby power cell, and applying an alternating current disturbance signal to the fuel cell system based on the DC/DC converter;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
the anode and the cathode of the standby power battery are respectively connected with the first end and the second end of the DC/DC converter, and the third end and the fourth end of the DC/DC converter are respectively connected with the anode and the cathode of the fuel cell system.
In this embodiment, the DC/DC converter is connected to the backup power battery, and after the fuel cell system is shut down, the backup power battery needs to be used to supply power to the fuel cell system, and then an ac disturbance signal is applied to the fuel cell system based on the DC/DC converter, and then a corresponding electrochemical impedance spectrum can be obtained according to an ac voltage signal fed back by the fuel cell system.
It is understood that the backup power cell does not supply power to the fuel cell system when the fuel cell system is in an operating state.
It can be understood that before the shutdown of the fuel cell system, the fuel cell may directly apply the ac perturbation signal to the fuel cell system through the DC/DC converter due to the running state of the fuel cell, and obtain the electrochemical impedance spectrum according to the ac voltage signal fed back by the fuel cell system.
Step S104, correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance, and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value.
In this embodiment, the low-frequency impedance, the second intermediate-frequency impedance, and the second high-frequency impedance may accurately represent the water content of the fuel cell system in the cold storage state, and the purge closed-loop criterion is corrected according to the three, that is, the first impedance target value and the second impedance target value are corrected, so as to determine a new first impedance target value and a new second impedance target value.
Optionally, a mapping relationship between different low-frequency impedances, second intermediate-frequency impedances, and second high-frequency impedances, and the first impedance target value and the second impedance target value may be established in advance, and the first impedance target value and the second impedance target value may be corrected according to the mapping relationship.
Step S105, saving the new first impedance target value and the new second impedance target value.
In this embodiment, by saving the new first impedance target value and the new second impedance target value and re-executing steps S102 to S105 when purging is performed before the next shutdown, the fuel cell system can be purged according to the new first impedance target value and the new second impedance target value.
To further improve the purging effect, in some embodiments of the present application, the method further comprises:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
In this embodiment, if the purging is finished when the purging duration reaches the preset maximum duration, it is indicated that the first intermediate-frequency impedance does not reach the first impedance target value or the first high-frequency impedance does not reach the second impedance target value at this time, the water content of the fuel cell system is relatively large, and the purging flow and/or the preset maximum duration is increased when the fuel cell system is purged before the next shutdown, so as to improve the purging effect.
By applying the technical scheme, when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system and acquiring a first medium-frequency impedance and a first high-frequency impedance of the fuel cell system in real time; purging the fuel cell system and ending the purging when the first intermediate-frequency impedance reaches a first impedance target value and the first high-frequency impedance reaches a second impedance target value; shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system; correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value; and storing the new first impedance target value and the new second impedance target value to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before next shutdown, and realizing cold purging dynamic closed loop of the fuel cell based on an optimized purging criterion, reducing the cold storage icing risk, improving the cold start performance of the stack, and improving the durability and the service life of the fuel cell.
The embodiment of the present application further provides a fuel cell purge control device based on DRT analysis, as shown in fig. 2, the device includes:
an electrochemical impedance spectrum acquisition module 100 for acquiring an electrochemical impedance spectrum of the fuel cell system;
a DRT analysis module 200 for performing a DRT analysis on the electrochemical impedance spectrum of the fuel cell system;
a purge module 300 for purging the fuel cell system;
a storage module 400 for storing the DRT analysis result;
a controller 500 for:
when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system based on the DRT analysis module 200 and acquiring a first intermediate-frequency impedance and a first high-frequency impedance of the fuel cell system in real time;
purging the fuel cell system based on the purge module 300 and ending the purging when the first intermediate frequency impedance reaches a first impedance target value and the first high frequency impedance reaches a second impedance target value;
shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state based on the DRT analysis module 200, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system;
correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value;
the new first impedance target value and the new second impedance target value are saved to the storage module 400 to purge the fuel cell system before the next shutdown according to the new first impedance target value and the new second impedance target value.
In a specific application scenario of the present application, as shown in fig. 3, the electrochemical impedance spectrum obtaining module 100 includes a DC/DC converter 110 and a backup power battery 120, and the controller 500 is further configured to:
after the fuel cell system is shut down, supplying power to the fuel cell system through the backup power battery 120, and applying an alternating-current disturbance signal to the fuel cell system based on the DC/DC converter 110;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
wherein, the positive pole and the negative pole of the backup power battery 120 are respectively connected with the first end and the second end of the DC/DC converter 110, and the third end and the fourth end of the DC/DC converter 110 are respectively connected with the anode 610 and the cathode 620 of the fuel cell system 600. The DC/DC converter 110 is a bidirectional DC/DC converter.
In a specific application scenario of the present application, the controller 500 is further configured to:
and after purging the fuel cell system, if the purging duration reaches the preset maximum duration, ending purging.
In a specific application scenario of the present application, the controller 500 is further configured to:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
In a specific application scenario of the present application, the controller 500 is further configured to:
if the low-frequency impedance is less than the first lowest impedance and the second intermediate-frequency impedance is less than the second lowest impedance and the second high-frequency impedance is less than the third lowest impedance, the purge flow and/or the preset maximum duration is reduced when the fuel cell system is purged before the next shutdown.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A method for controlling purging of a fuel cell based on DRT analysis, the method comprising:
when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system and acquiring a first intermediate-frequency impedance and a first high-frequency impedance of the fuel cell system in real time;
purging the fuel cell system and ending the purging when the first intermediate frequency impedance reaches a first impedance target value and the first high frequency impedance reaches a second impedance target value;
shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system;
correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value;
saving the new first impedance target value and the new second impedance target value to purge the fuel cell system before the next shutdown according to the new first impedance target value and the new second impedance target value.
2. The method of claim 1, wherein after shutting down the fuel cell system, the method further comprises:
supplying power to the fuel cell system through the standby power cell, and applying an alternating current disturbance signal to the fuel cell system based on the DC/DC converter;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
the anode and the cathode of the standby power battery are respectively connected with the first end and the second end of the DC/DC converter, and the third end and the fourth end of the DC/DC converter are respectively connected with the anode and the cathode of the fuel cell system.
3. The method of claim 1, wherein after purging the fuel cell system, the method further comprises:
and if the purging duration reaches the preset maximum duration, ending purging.
4. The method of claim 3, wherein the method further comprises:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
5. The method of claim 3, wherein after obtaining the low frequency impedance, the second mid frequency impedance, and the second high frequency impedance of the fuel cell system, the method further comprises:
and if the low-frequency impedance is smaller than the first lowest impedance, the second intermediate-frequency impedance is smaller than the second lowest impedance, and the second high-frequency impedance is smaller than the third lowest impedance, reducing the purging flow and/or the preset maximum time length when the fuel cell system is purged before next shutdown.
6. A fuel cell purge control apparatus based on DRT analysis, the apparatus comprising:
the electrochemical impedance spectrum acquisition module is used for acquiring an electrochemical impedance spectrum of the fuel cell system;
the DRT analysis module is used for carrying out DRT analysis on the electrochemical impedance spectrum of the fuel cell system;
the purging module is used for purging the fuel cell system;
the storage module is used for storing DRT analysis results;
a controller to:
when a shutdown command sent by a user is received, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system based on the DRT analysis module, and acquiring a first medium-frequency impedance and a first high-frequency impedance of the fuel cell system in real time;
purging the fuel cell system based on the purge module and ending the purging when the first intermediate frequency impedance reaches a first impedance target value and the first high frequency impedance reaches a second impedance target value;
shutting down the fuel cell system, performing DRT analysis on an electrochemical impedance spectrum of the fuel cell system in a cold storage state based on the DRT analysis module, and acquiring low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system;
correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value;
and saving the new first impedance target value and the new second impedance target value to the storage module so as to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before next shutdown.
7. The apparatus of claim 6, wherein the electrochemical impedance spectroscopy acquisition module comprises a DC/DC converter and a backup power cell, the controller further configured to:
after the fuel cell system is shut down, supplying power to the fuel cell system through the standby power cell, and applying an alternating current disturbance signal to the fuel cell system based on the DC/DC converter;
acquiring an electrochemical impedance spectrum of the fuel cell system in a cold storage state according to an alternating voltage signal fed back by the fuel cell system;
the anode and the cathode of the standby power battery are respectively connected with the first end and the second end of the DC/DC converter, and the third end and the fourth end of the DC/DC converter are respectively connected with the anode and the cathode of the fuel cell system.
8. The apparatus of claim 6, wherein the controller is further to:
and after purging the fuel cell system, if the purging duration reaches the preset maximum duration, ending purging.
9. The apparatus of claim 8, wherein the controller is further to:
and if the purging is finished because the purging duration reaches the preset maximum duration, increasing the purging flow and/or the preset maximum duration when the fuel cell system is purged before next shutdown.
10. The apparatus of claim 8, wherein the controller is further to:
and if the low-frequency impedance is smaller than the first lowest impedance, the second intermediate-frequency impedance is smaller than the second lowest impedance, and the second high-frequency impedance is smaller than the third lowest impedance, reducing the purging flow and/or the preset maximum time length when the fuel cell system is purged before next shutdown.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114824383A (en) * | 2022-04-27 | 2022-07-29 | 电子科技大学 | Air-cooled fuel cell anode control method based on electrochemical impedance spectroscopy |
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| CN114865021A (en) * | 2022-05-30 | 2022-08-05 | 中国第一汽车股份有限公司 | Fuel cell drainage control method and device, vehicle and storage medium |
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| CN114865014A (en) * | 2022-07-06 | 2022-08-05 | 苏州中车氢能动力技术有限公司 | Purging method for fuel cell |
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| CN114335613B (en) | 2022-05-13 |
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