CN116190722B - Control method for automatically recovering performance of fuel cell - Google Patents
Control method for automatically recovering performance of fuel cell Download PDFInfo
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- CN116190722B CN116190722B CN202310486096.6A CN202310486096A CN116190722B CN 116190722 B CN116190722 B CN 116190722B CN 202310486096 A CN202310486096 A CN 202310486096A CN 116190722 B CN116190722 B CN 116190722B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04544—Voltage
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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
- H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- 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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Abstract
The application discloses a control method for automatically recovering performance of a fuel cell, and belongs to the technical field of fuel cells. The control method comprises the following steps: monitoring minimum voltage data of the battery; if the lowest voltage data is lower than the first voltage threshold value, setting the normally open frequency to be 0, and switching the drain valve to a normally open state; if the lowest voltage data is higher than the second voltage threshold value, switching the drain valve to a normal running state of the drain valve; if the duration of the normally open state reaches a first time threshold, automatically increasing the normally open frequency by 1, and switching the drain valve to a normally closed state; if the normally open times is greater than or equal to the normally open times threshold, switching the battery to a battery power limiting state, and switching the drain valve to a drain valve normal running state; and if the duration of the normally-closed state reaches the second time threshold, switching the drain valve to the normally-open state. The method can complete purging without hydrogen pressurization, so as to save hydrogen resources and improve the safety and stability of the system.
Description
Technical Field
The application relates to the technical field of fuel cells, in particular to a control method for automatically recovering the performance of a fuel cell.
Background
In the power generation process of the fuel cell, the essence of the total reaction is the process of reacting hydrogen with oxygen in the air to generate water, and as the fuel cell system operates, the generated water gradually accumulates in the fuel cell stack to block a fuel gas (hydrogen) transmission channel, so that the performance of the fuel cell is attenuated, and the power generation efficiency of the fuel cell system is reduced.
In order to solve the above problems, the existing control strategies mostly adopt methods of increasing the hydrogen pressure and prolonging the hydrogen purging time. The application patent with the application number of CN202210598328.2 discloses a fuel cell drainage control method, a device, a vehicle and a storage medium, wherein the method comprises the following steps: acquiring the current impedance of the fuel cell; if the current impedance is smaller than or equal to a first threshold value, controlling the fuel cell to drain; and if the current impedance is larger than or equal to the second threshold value, controlling the fuel cell to stop draining. The disclosed fuel cell drainage control method monitors the impedance of the fuel cell, and controls the opening and closing of a fuel drainage valve according to the impedance by using the impedance to react the water content in the electric pile. The existing problems of the method are that if the impedance of the fuel cell cannot be adjusted to the second threshold value in a short time, excessive hydrogen is wasted due to the continuously opened drain valve, and the hydrogen utilization rate is reduced, namely the comprehensive power generation efficiency of the fuel cell system is reduced; meanwhile, since hydrogen is a flammable and explosive gas, the long-term discharge of hydrogen into the atmosphere also increases safety risks.
Disclosure of Invention
In order to solve the problems existing in the prior art, the application adopts the following technical scheme:
a control method for automatically recovering the performance of fuel cell includes the control method for the normal running state of the cell; the battery normal operation state control method comprises the following steps:
s111, monitoring the lowest voltage data of the battery in a normal running state of the battery;
s112, if the lowest voltage data is lower than a first voltage threshold, setting the normally open frequency to be 0, and switching the drain valve to a normally open state;
s113, if the lowest voltage data is higher than a second voltage threshold, switching the drain valve to a normal running state of the drain valve, and returning to the step S112;
if the duration of the normally open state reaches a first time threshold, the normally open times are increased by 1, and the drain valve is switched to a normally closed state;
s114, if the normally open times is greater than or equal to a normally open times threshold, switching the battery to a battery power limiting state, and switching the drain valve to a drain valve normal running state;
s115, if the duration of the normally-closed state reaches a second time threshold, switching the drain valve to the normally-open state, and returning to the step S113;
wherein the first voltage threshold is less than the second voltage threshold.
Further, the control method for automatically recovering the performance of the fuel cell further comprises a battery power limit state control method; the battery power limit state control method includes:
s121, monitoring the lowest voltage data of the battery in a battery power limiting state;
and S122, if the lowest voltage data is higher than the second voltage threshold, switching the battery to a normal battery running state.
As a preferable scheme, the minimum voltage data of the monitoring battery specifically includes: and monitoring voltage data of all single batteries in the batteries, and obtaining the lowest voltage data according to the voltage data.
As a preferable scheme, the normal running state of the drain valve specifically includes: the drain valve is intermittently opened and closed when the duration of opening reaches a third time threshold.
Preferably, the third time threshold is smaller than the first time threshold.
Preferably, the switching the battery to the battery power limiting state specifically includes: the operating power of the battery is limited to below the rated power of the battery.
Preferably, the lowest voltage data is transmitted through controller area network communication.
As a preferred embodiment, the control method for automatically recovering the performance of the fuel cell is applied to a control system for automatically recovering the performance of the fuel cell; the system comprises a voltage inspection module, a control module and a fuel cell module; the fuel cell module comprises a hydrogen inlet, a tail row, a gas-water separator, a galvanic pile and a drain valve; the voltage inspection module is used for collecting voltage data of all single batteries in the electric pile and calculating the lowest voltage data according to the voltage data; and the control module is used for controlling the working states of the drain valve and the battery according to the lowest voltage data.
Preferably, the working states of the drain valve comprise a normally open state, a normally closed state and a normal running state of the drain valve; the operating states of the battery include a battery normal operating state and a battery power limit state.
As a preferred solution, the control method for automatically recovering the performance of the fuel cell further includes a purge flow of the fuel cell, wherein the purge flow of the fuel cell is performed in a normally open state of the drain valve; the purging flow of the fuel cell specifically comprises the following steps:
hydrogen enters the electric pile through the hydrogen inlet and forms a gas-water mixture with water in the electric pile;
the gas-water mixture flows out of the electric pile and enters the gas-water separator, and the gas-water separator separates the gas-water mixture to obtain hydrogen and water;
the separated hydrogen flows out from the upper part of the gas-water separator and flows back to the electric pile; the separated water flows from the bottom of the gas-water separator through the drain valve and is discharged to the atmosphere through the tail drain.
Compared with the prior art, the application has the following beneficial effects:
in the method, as the duration time of the normally open state of the drain valve is short, the system can complete the purging process without pressurizing hydrogen, so as to avoid irreversible damage to the system caused by excessive pressure, thereby improving the stability of the system;
by controlling the working state of the drain valve, the discharge speed of hydrogen in the air is slowed down, so that the hydrogen concentration in the atmosphere environment is reduced, and the combustion and explosion risks are further reduced;
when the problem is not solved by the repeated purging, the water discharge valve is switched to the normal running state of the water discharge valve, so that hydrogen resources can be saved; and by limiting battery power, the damage to the system is reduced while maintaining the operation of the system, thereby improving the safety of the system.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for controlling a normal operation state of a battery according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a battery normal operation state control process according to a first embodiment of the present application;
FIG. 3 is a flowchart of a battery power limit state control method according to a first embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a battery power limit state control process according to a first embodiment of the present application;
fig. 5 is a schematic structural diagram of a control system for automatically recovering performance of a fuel cell according to a second embodiment of the present application.
Detailed Description
The technical solutions of the present application will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The first embodiment of the application provides a control method for automatically recovering the performance of a fuel cell, which comprises a control method for the normal running state of the cell and a control method for the power limiting state of the cell. When the battery is in the normal running state of the battery, the control method for automatically recovering the performance of the fuel battery executes the control method for the normal running state of the battery; the control method of automatically restoring the performance of the fuel cell of the present application performs the battery power limit state control method when the battery is in the battery power limit state. Referring to fig. 1, a method for controlling a normal operation state of a battery according to an embodiment includes:
and S111, monitoring the lowest voltage data of the battery in the normal running state of the battery.
And S112, if the lowest voltage data is lower than a first voltage threshold value, setting the normally open frequency to be 0, and switching the drain valve to a normally open state.
S113, if the lowest voltage data is higher than a second voltage threshold, switching the drain valve to a normal running state of the drain valve, and returning to the step S112;
and if the duration time of the normally open state reaches a first time threshold value, automatically increasing the normally open frequency by 1, and switching the drain valve to a normally closed state.
And S114, if the normally open times is greater than or equal to a normally open times threshold, switching the battery to a battery power limiting state, switching the drain valve to a drain valve normal running state, exiting the battery normal running state control method, and executing the battery power limiting state control method.
And S115, if the duration of the normally-closed state reaches a second time threshold, switching the drain valve to the normally-open state, and returning to the step S113.
Wherein the first voltage threshold is less than the second voltage threshold. In this embodiment, the first voltage threshold is 500mv and the second voltage threshold is 600mv. The control method of the normal running state of the battery controls the drain valve according to the lowest voltage data of the battery, and further controls the water content of the fuel battery, so that the lowest voltage data of all single batteries in the fuel battery is higher than a first voltage threshold value, and the stable performance and long-time reliable running of the fuel battery are ensured.
Fig. 2 is a schematic diagram of a control process of a normal operation state of a battery according to a first embodiment of the present application, as shown in fig. 2, the lowest voltage data is first obtained, when the lowest voltage data is lower than a first voltage threshold, the drain valve is controlled to be normally open by software, and the normally open frequency is set to be 0. If the lowest voltage data is higher than the second voltage threshold value in the first time threshold value, the system can be considered to be recovered to be normal, and the drain valve is switched to a normal running state of the drain valve; and if the lowest voltage data is continuously lower than the second voltage threshold value within the first time threshold value for which the normally open state of the drain valve is continuous, switching the drain valve to the normally closed state, and switching the drain valve to the normally open state after the second time threshold value is continuous. When the normally open times of the drain valve exceeds the normally open times threshold, the drain valve resumes normal control, and in order to avoid damaging the stack, the battery is switched to a power limiting state.
Further, referring to fig. 3 and 4, a battery power limit state control method according to a first embodiment includes:
s121, monitoring the lowest voltage data of the battery in a battery power limiting state;
and S122, if the lowest voltage data is higher than a second voltage threshold, switching the battery to a normal running state of the battery, exiting the battery power limit state control method, and executing the normal running state control method of the battery.
As a preferred embodiment of the present application, the lowest voltage data of the battery is monitored, specifically: and monitoring voltage data of all single batteries in the batteries, and obtaining the lowest voltage data according to the voltage data. It should be noted that the voltage data in the method of the present application is not a fixed value, but a variation value obtained by continuous monitoring. It is understood that the lowest voltage data is a change value updated in real time according to the voltage data.
In the implementation process of the control method for automatically recovering the performance of the fuel cell, the lowest voltage data of the cell is monitored from the start of the cell system until the end of the power failure of the cell system.
As a preferred embodiment, the control method for automatically recovering the performance of the fuel cell of the present application further includes a purge flow of the fuel cell, which is simultaneously performed in a normally open state of the drain valve. The purge flow is used to purge the water in the fuel cell by using hydrogen gas and to vent the water to the atmosphere through a drain valve.
Specifically, in this embodiment, the first time threshold and the second time threshold are both 1 minute, and the normally open frequency threshold is 4 times. Therefore, in the control method for the normal running state of the battery, the normally-open state and the normally-closed state of the drain valve each time last for 1 minute, and the normally-open state for a short time enables the fuel cell system to complete the purging process without pressurizing hydrogen. And when the normally open times reach 4 times, the battery is switched to a battery power limiting state, and the drain valve is switched to a drain valve normal running state, so that the damage to the system is reduced while the system is maintained to run, and the safety of the system is improved.
As a preferred embodiment of the present application, the normal operation state of the drain valve is specifically: the drain valve is intermittently opened and closed when the duration of opening reaches a third time threshold. The time interval of intermittent opening of the drain valve is determined by the real-time system state of the fuel cell. In this embodiment, the third time threshold is 0.5s. The third time threshold is far smaller than the first time threshold, so that the intermittent opening time of the drain valve is far smaller than the duration time of the normally open state, and the hydrogen consumption of the battery in the normal running state is reduced.
Further, the switching the battery to the battery power limit state is specifically: the operating power of the battery is limited to below the rated power of the battery. The decrease in battery voltage may unbalance chemical reactions inside the battery, accelerate aging of the battery and shorten the life thereof. And limiting the operating power of the battery can effectively protect the battery and improve the energy efficiency and performance of the battery.
As a preferred embodiment of the application, the lowest voltage data is transmitted via the controller area network during the implementation of the control method of the application. The controller area network transmits data in a differential signal mode, namely, the voltage on the signal transmission line is cancelled, and only the voltage difference part is received, so that the controller area network has excellent error rate control and anti-interference capability, and the reliability and stability of data transmission are ensured.
The second embodiment of the application discloses a control method for automatically recovering the performance of a fuel cell, which is applied to a control system for automatically recovering the performance of the fuel cell. Referring to fig. 5, the system includes a voltage patrol module, a control module, and a fuel cell module. The fuel cell module comprises the hydrogen inlet, a tail row, a gas-water separator, a galvanic pile and a drain valve. Further, the hydrogen inlet is connected with an external hydrogen input source to provide hydrogen for chemical reaction of the electric pile. The electric pile is the medium for chemical reaction of fuel cell, and hydrogen and air entering the electric pile react in the electric pile to produce electric energy output and water. The gas-water separator is used for separating unreacted hydrogen from water, the water is gathered at the bottom of the separator, the water is discharged when the drain valve is started, and the hydrogen flows out from the upper part of the separator and enters the reflux gas path. The drain valve is used for draining water generated by the chemical reaction of the electric pile, and when the drain valve is opened, hydrogen gas discharged from the electric pile can be drained, and unreacted hydrogen gas enters the electric pile again to participate in the reaction. The tail row is used for discharging water and hydrogen discharged when the drain valve is opened to the atmosphere.
Further, the voltage inspection module is used for collecting voltage data of all single batteries in the electric pile and calculating to obtain the lowest voltage data according to the voltage data. The control module is used for controlling the working states of the drain valve and the battery according to the lowest voltage data and storing preset data. The preset data comprises a first time threshold, a second time threshold, a third time threshold, a fourth time threshold, a first voltage threshold, a second voltage threshold and a normally open time threshold.
Further, the working states of the drain valve comprise a normally open state, a normally closed state and a normal running state of the drain valve. The operating states of the battery include a battery normal operating state and a battery power limit state.
In the embodiment, the duration of opening the drain valve is a first time threshold in the normally open state of the drain valve, and the duration of closing the drain valve is a second time threshold in the normally closed state of the drain valve; in the normal operation state of the drain valve, the drain valve opening and closing are alternately performed, wherein the duration of the drain valve opening is a third time threshold and the duration of the drain valve closing is a fourth time threshold. In one embodiment, the fourth time threshold is set to 15s.
Further, the control method for automatically recovering the performance of the fuel cell according to the second embodiment of the present application includes a control method for a normal operation state of the battery and a control method for a power limit state of the battery. When the battery is in the normal running state of the battery, the control method for automatically recovering the performance of the fuel battery executes the control method for the normal running state of the battery; the control method of automatically restoring the performance of the fuel cell of the present application performs the battery power limit state control method when the battery is in the battery power limit state.
The method for controlling the normal running state of the battery provided by the second embodiment of the application comprises the following steps:
s211, in a normal running state of the battery, the voltage inspection module monitors the lowest voltage data of the battery and transmits the lowest voltage data to the control module through the controller area network.
And S212, when the lowest voltage data is lower than a first voltage threshold value, the control module sets the normally open frequency to be 0 and switches the drain valve to a normally open state.
And S213, when the lowest voltage data is higher than a second voltage threshold, the control module switches the drain valve to a normal running state of the drain valve, and the step S212 is returned.
When the duration of the normally open state reaches a first time threshold, the control module increases the normally open frequency by 1 and switches the drain valve to a normally closed state.
And S214, when the normally open times is greater than or equal to a normally open times threshold, the control module switches the battery to a battery power limiting state, switches the drain valve to a drain valve normal running state, and exits the battery normal running state control method at the same time to execute the battery power limiting state control method. The control module switches the battery to a battery power limiting state specifically comprises the following steps: the control module sends a control instruction to the electric pile to limit the working power of the electric pile below the rated power of the electric pile.
And S215, when the duration time of the normally-closed state reaches a second time threshold value, the control module switches the drain valve to the normally-open state and returns to the step S213.
The battery power limit state control method provided by the second embodiment of the application comprises the following steps:
s221, in a battery power limiting state, the voltage inspection module monitors the lowest voltage data of the battery and transmits the lowest voltage data to the control module through a controller area network;
and S222, when the lowest voltage data is higher than a second voltage threshold, the control module switches the battery to a battery normal running state, and exits the battery power limit state control method at the same time, and executes the battery normal running state control method.
In the battery normal running state control method and the battery power limit state control method, the control module controls the state switching of the drain valve through a software program.
As a preferred embodiment, the control method for automatically recovering the performance of the fuel cell of the present application further includes a purge flow of the fuel cell, which is simultaneously performed in a normally open state of the drain valve. The purging flow of the fuel cell specifically comprises the following steps:
hydrogen enters the electric pile through the hydrogen inlet and forms a gas-water mixture with water in the electric pile.
And the gas-water mixture flows out of the electric pile and enters the gas-water separator, and the gas-water separator separates the gas-water mixture into hydrogen and water.
The separated hydrogen flows out from the upper part of the gas-water separator and flows back to the electric pile; the separated water flows from the bottom of the gas-water separator through a drain valve and is discharged to the atmosphere through a tail drain.
As a preferred embodiment, the control method for automatically recovering performance of a fuel cell of the present application further includes a normal operation flow of the fuel cell, which is performed in a normal operation state of the drain valve; the normal operation flow of the fuel cell specifically comprises the following steps:
hydrogen enters the pile through the hydrogen inlet and reacts with air in the pile to produce water and electric energy output.
The hydrogen forms a gas-water mixture with the water in the stack.
And the gas-water mixture flows out of the electric pile and enters a gas-water separator, and the gas-water separator separates the gas-water mixture into hydrogen and water.
The separated hydrogen flows out from the upper part of the gas-water separator and flows back to the electric pile; the separated water is collected at the bottom of the gas-water separator, and when the drain valve is opened, the water flows through the drain valve from the bottom of the gas-water separator and is discharged to the atmosphere through the tail drain.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working procedures of the above-described system and module may refer to the corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection of modules, electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random access memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Claims (5)
1. A control method for automatically recovering the performance of a fuel cell, characterized by: the control system is applied to a control system for automatically recovering the performance of the fuel cell; the system comprises a voltage inspection module, a control module and a fuel cell module; the fuel cell module comprises a tail row, a gas-water separator and a drain valve; the water discharge valve is connected with a tail row, and the tail row discharges water and hydrogen to the atmosphere when the water discharge valve is opened; the voltage inspection module is used for collecting voltage data of all single batteries in the electric pile and calculating the lowest voltage data according to the voltage data; the control module is used for controlling the working states of the drain valve and the battery according to the lowest voltage data;
the control method for automatically recovering the performance of the fuel cell comprises a control method for the normal running state of the cell and a control method for the power limit state of the cell; the battery normal operation state control method comprises the following steps:
s111, monitoring the lowest voltage data of the battery in a normal running state of the battery;
s112, if the lowest voltage data is lower than a first voltage threshold, setting the normally open frequency to be 0, and switching the drain valve to a normally open state;
s113, if the lowest voltage data is higher than a second voltage threshold, switching the drain valve to a normal running state of the drain valve, and returning to the step S112;
if the duration of the normally open state reaches a first time threshold, the normally open times are increased by 1, and the drain valve is switched to a normally closed state;
s114, if the normally open times is greater than or equal to a normally open times threshold, switching the battery to a battery power limiting state, and switching the drain valve to a drain valve normal running state;
s115, if the duration of the normally-closed state reaches a second time threshold, switching the drain valve to the normally-open state, and returning to the step S113;
the first voltage threshold is smaller than the second voltage threshold, the first time threshold and the second time threshold are both 1 minute, and the normally open time threshold is 4 times; the normal running state of the drain valve is specifically as follows: the drain valve is intermittently opened, and the drain valve is closed when the duration of opening reaches a third time threshold; the third time threshold is 0.5s;
the battery power limit state control method includes:
s121, monitoring the lowest voltage data of the battery in a battery power limiting state;
s122, if the lowest voltage data is higher than the second voltage threshold, switching the battery to a normal battery running state;
the method also comprises a purging flow of the fuel cell, wherein the purging flow of the fuel cell is simultaneously executed in a normally open state of a drain valve; the purging flow of the fuel cell specifically comprises the following steps:
hydrogen enters the electric pile through a hydrogen inlet and forms a gas-water mixture with water in the electric pile;
the gas-water mixture flows out of the galvanic pile and enters the gas-water separator, and the gas-water separator separates the gas-water mixture to obtain hydrogen and water;
the separated hydrogen flows out from the upper part of the gas-water separator and flows back to the electric pile; the separated water flows from the bottom of the gas-water separator through the drain valve and is discharged to the atmosphere through the tail drain.
2. The control method for automatically recovering the performance of a fuel cell according to claim 1, wherein: the minimum voltage data of the monitoring battery is specifically: and monitoring voltage data of all single batteries in the batteries, and obtaining the lowest voltage data according to the voltage data.
3. The control method for automatically recovering the performance of a fuel cell according to claim 1, wherein: the step of switching the battery to a battery power limiting state is specifically as follows: the operating power of the battery is limited to below the rated power of the battery.
4. The control method for automatically recovering the performance of a fuel cell according to claim 1, wherein: the lowest voltage data is communicated and transmitted through the controller area network.
5. The control method for automatically recovering the performance of a fuel cell according to claim 1, wherein: the working states of the drain valve comprise a normally open state, a normally closed state and a normal running state of the drain valve; the operating states of the battery include a battery normal operating state and a battery power limit state.
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| CN202310486096.6A CN116190722B (en) | 2023-05-04 | 2023-05-04 | Control method for automatically recovering performance of fuel cell |
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| CN202310486096.6A CN116190722B (en) | 2023-05-04 | 2023-05-04 | Control method for automatically recovering performance of fuel cell |
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| CN116190722B true CN116190722B (en) | 2023-08-29 |
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