CN113782778B - Electric pile water management regulation and control method and device based on fixed frequency impedance and gas pressure drop - Google Patents
Electric pile water management regulation and control method and device based on fixed frequency impedance and gas pressure drop Download PDFInfo
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- CN113782778B CN113782778B CN202111032672.7A CN202111032672A CN113782778B CN 113782778 B CN113782778 B CN 113782778B CN 202111032672 A CN202111032672 A CN 202111032672A CN 113782778 B CN113782778 B CN 113782778B
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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
- H01M8/04313—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
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04388—Pressure; Ambient pressure; Flow of anode reactants at the inlet or inside the fuel cell
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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
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04395—Pressure; Ambient pressure; Flow of cathode reactants at the inlet or inside the fuel cell
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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
- H01M8/04634—Other electric variables, e.g. resistance or impedance
- H01M8/04649—Other electric variables, e.g. resistance or impedance of fuel cell stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The application discloses a method and a device for controlling and controlling galvanic pile water based on fixed frequency impedance and gas pressure drop, wherein the method comprises the following steps: exciting a stack of the fuel cell by periodically applying a fixed high frequency alternating voltage to the DCDC to measure a high frequency impedance of the stack; judging whether the high-frequency impedance is larger than a membrane dry threshold value or not; if the pressure value of the reaction gas of the fuel cell is larger than the flooding threshold, the fuel cell is judged to be in the flooding state so as to monitor the current state of the fuel cell on line. The method can realize accurate diagnosis of the membrane dryness and flooding, can be applied in real time on line, and is simple and easy to realize.
Description
Technical Field
The application relates to the technical field of fuel cells, in particular to a method and a device for controlling electric pile water management based on fixed frequency impedance and gas pressure drop.
Background
Proton exchange membrane fuel cells are widely favored in the fields of new energy locomotives, tramcars, automobiles, portable power sources, distributed power generation and the like because of the advantages of high energy conversion rate, no pollution, high starting speed, low operating temperature and the like. However, the current PEMFC has the defects of short service life, poor stability and the like, and prevents large-scale commercial popularization and application of the PEMFC. Particularly, as PEMFC power increases, flooding and membrane dry failures are more likely to occur, resulting in reduced durability of the system, impaired performance, and even reduced remaining life. The accurate revealing PEMFC floods and membrane dry fault production mechanism, effective diagnosis floods and membrane dry fault state, and the solution after seeking floods and membrane dry fault and take place has become research focus gradually.
At present, the diagnosis methods for PEMFC flooding and membrane dry faults are mainly based on three diagnosis methods of model, experiment and data driving. The diagnosis method based on the model is mainly to simulate the running state of the battery through a mathematical model, so that the accuracy of fault prediction depends on the accuracy of the established model, the high-accuracy model is complex in structure and long in calculation time, and meanwhile, the internal water vapor and heat of the fuel cell are mutually coupled, so that the time variability is high, and high requirements are put forward on modeling; the experimental method based on the alternating current impedance spectrum and the membrane impedance can accurately locate faults according to the impedance characteristics of the single-chip battery, and can describe the impedance characteristics of the whole electric pile.
However, by testing the impedance spectrum by frequency scanning, averaging over multiple measurements to obtain the impedance at a single frequency point, these processes have the disadvantage of being time consuming, preventing their use in on-line diagnostics. When a single frequency point is scanned to represent impedance, the impedance index for reflecting flooding and film drying is difficult to select the corresponding frequency point, and particularly the low-frequency impedance point representing flooding failure. The data driving method directly uses the data of the PEMFC during operation as training data for testing, processes the data through different mathematical algorithms to obtain the characteristics of flooding, film drying and normal state, and judges the working state of the battery under the rest data according to the characteristics. The fault diagnosis method based on data driving can be applied to on-line diagnosis, high-power PEMFC pile and multi-pile flooding and membrane dry fault diagnosis, and has great advantages for positioning of fault singlechips in the pile. But the time required by the algorithm, the feature classification, the fault recognition accuracy and the like need to be further improved and improved.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the application aims to provide a galvanic pile water management and control method based on fixed frequency impedance and gas pressure drop, which can realize accurate diagnosis of membrane dryness and flooding, can be applied on line in real time, and is simple and easy to realize.
Another object of the present application is to provide a galvanic pile water management control device based on a constant frequency impedance and a gas pressure drop.
In order to achieve the above objective, in one aspect, an embodiment of the present application provides a method for controlling water management of a galvanic pile based on a constant frequency impedance and a gas pressure drop, including the following steps: exciting a stack of fuel cells by periodically applying a fixed high frequency alternating voltage to DCDC to measure the high frequency impedance of the stack; judging whether the high-frequency impedance is larger than a membrane dry threshold value or not; and if the pressure value is larger than a flooding threshold, judging that the fuel cell is in the flooding state so as to monitor the current state of the fuel cell on line.
According to the electric pile water management regulation and control method based on the constant-frequency impedance and the gas pressure drop, the impedance is used as an index of the film dryness, the film dryness is diagnosed by utilizing the on-line measurement of the ohmic impedance, and the flooding condition is judged by measuring the gas pressure drop during the operation of the electric pile, so that the problem that the constant-frequency impedance detection is inaccurate in diagnosing the flooding state of the film is effectively solved, the accurate diagnosis of the film dryness and the flooding can be realized, and the method can be applied on line in real time and is simple and easy to realize.
In addition, the pile water management and control method based on the fixed-frequency impedance and the gas pressure drop according to the embodiment of the application can also have the following additional technical characteristics:
further, in one embodiment of the present application, when the fuel cell is in a membrane dry state, the method further includes: determining a membrane dry state grade to determine a membrane operating parameter adjustment value according to the membrane dry state grade, wherein the operating parameter comprises a stack operating temperature, an outlet flow, a stack pressure, an inlet air humidity and a current density; and regulating one or more of the parameters according to the operation parameter regulating value so as to slow down the dryness of the membrane.
Further, in one embodiment of the present application, when the fuel cell is in a flooded state, the method further includes: determining a flooding state grade, and determining an operation parameter adjustment value according to the flooding state grade, wherein the operation parameter comprises a pile working temperature, an outlet flow, a pile pressure, an inlet air humidity and a current density; and regulating one or more of the parameters according to the operation parameter regulating value so as to slow down the flooding degree.
Further, in one embodiment of the present application, the method further includes: and setting the flooding threshold according to the pressure drop change rule when the fuel cell is in a flooding state.
Further, in one embodiment of the present application, the reaction gas may include hydrogen and air.
In order to achieve the above object, another embodiment of the present application provides a galvanic pile water management control device based on constant frequency impedance and gas pressure drop, including: a measurement module for exciting a stack of fuel cells by a DCDC periodic application of a fixed high frequency alternating voltage to measure a high frequency impedance of the stack; the judging module is used for judging whether the high-frequency impedance is larger than a membrane dry threshold value or not; and the regulation and control module is used for judging that the fuel cell is in a membrane dry state when the high-frequency impedance is larger than the membrane dry threshold, otherwise, collecting the pressure value of the reaction gas of the fuel cell, and judging that the fuel cell is in a flooding state when the pressure value is larger than the flooding threshold so as to monitor the current state of the fuel cell on line.
According to the electric pile water management and control device based on the constant-frequency impedance and the gas pressure drop, the impedance is used as an index of the film dryness, the film dryness is diagnosed by utilizing the on-line measurement of the ohmic impedance, and the flooding condition is judged by measuring the gas pressure drop during the operation of the electric pile, so that the problem that the film flooding state is not accurately diagnosed by the constant-frequency impedance detection is effectively solved, the accurate diagnosis of the film dryness and the flooding can be realized, and the electric pile water management and control device can be applied on line in real time and is simple and easy to realize.
In addition, the pile water management and control device based on the fixed-frequency impedance and the gas pressure drop according to the embodiment of the application can also have the following additional technical characteristics:
further, in one embodiment of the present application, when the fuel cell is in a dry state, the regulation module is further configured to determine a dry state level of the membrane, so as to determine a membrane operation parameter adjustment value according to the dry state level of the membrane, where the operation parameter includes a stack operating temperature, an outlet flow rate, a stack pressure, an intake air humidity, and a current density, and regulate one or more of the parameters according to the membrane operation parameter adjustment value, so as to slow down a degree of dry of the membrane.
Further, in one embodiment of the present application, when the fuel cell is in a flooded state, the regulation module is further configured to determine a flooded state level, so as to determine an operation parameter adjustment value according to the flooded state level, where the operation parameter includes a stack operating temperature, an outlet flow, a stack pressure, an intake air humidity, and a current density, and regulate one or more of the flooded parameters according to the parameter adjustment value, so as to slow down a degree of flooding.
Further, in one embodiment of the present application, the method further includes: the setting module is used for setting the flooding threshold according to the pressure drop change rule when the fuel cell is in the flooding state.
Further, in one embodiment of the present application, the reaction gas may include hydrogen and air.
Additional aspects and advantages of the application 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 application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural view of a fuel cell system according to an embodiment of the present application;
FIG. 2 is a flow chart of a method of stack water management regulation based on constant frequency impedance and gas pressure drop in accordance with one embodiment of the present application;
FIG. 3 is a flow chart of a method of stack water management regulation based on constant frequency impedance and gas pressure drop in accordance with one embodiment of the present application;
FIG. 4 is a schematic diagram of a galvanic pile water management mode according to one embodiment of the application;
FIG. 5 is a block schematic diagram of a galvanic pile water management control device based on fixed frequency impedance and gas pressure drop according to one embodiment of the application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
Before describing the method and the device for controlling the water management of the electric pile based on the constant frequency impedance and the gas pressure drop, the fuel cell system is described, and as shown in fig. 1, the fuel cell system comprises an electric pile, an air subsystem, a hydrogen subsystem, a thermal management subsystem and a voltage conversion device. The electric pile comprises a CVM voltage inspection device; the voltage conversion device is mainly DCDC, and can periodically excite the high-frequency voltage of the galvanic pile besides the function of improving the direct-current voltage; the air subsystem comprises an air filter, an air compressor, an intercooler, a humidifier, a back pressure valve, a three-way valve and a high-precision air pressure sensor; the hydrogen subsystem comprises a gas-water separation device, a high-precision hydrogen pressure sensor, a hydrogen circulating pump, an ejector, a pressure reducing valve and a hydrogen bottle; the thermal management subsystem comprises a radiator, a three-way valve, a water pump and a PTC.
The method and the device for controlling the electric pile water management based on the constant frequency impedance and the gas pressure drop according to the embodiment of the application are described below with reference to the accompanying drawings, and the method for controlling the electric pile water management based on the constant frequency impedance and the gas pressure drop according to the embodiment of the application is described first with reference to the accompanying drawings.
FIG. 2 is a flow chart of a method of stack water management regulation based on constant frequency impedance and gas pressure drop in accordance with one embodiment of the present application.
As shown in fig. 2, the method for controlling the water management of the galvanic pile based on the constant frequency impedance and the gas pressure drop comprises the following steps:
in step S101, a fixed high-frequency alternating current excitation is periodically applied to the stack of the fuel cell by DCDC to measure the high-frequency impedance of the stack.
It can be understood that the embodiment of the application can periodically excite the fixed high-frequency alternating voltage of the electric pile through the DCDC to calculate the fixed high-frequency impedance of the fuel cell.
The amplitude of the excitation signal of the alternating current impedance can be 5% -10% of the operating voltage or current of the electric pile, and the frequency is above 300 Hz.
In step S102, it is determined whether the high-frequency impedance is greater than the film dry threshold.
The membrane dry threshold may be set or calibrated according to specific conditions, and is not specifically limited.
In step S103, if the pressure value is greater than the flooding threshold, the fuel cell is determined to be in a flooding state, and if the pressure value is greater than the flooding threshold, the fuel cell is determined to be in a flooding state, so as to monitor the current state of the fuel cell on line.
Wherein the reaction gas may include hydrogen and air; the embodiment of the application can set the flooding threshold according to the pressure drop change rule when the fuel cell is in the flooding state.
Specifically, when the resistance value increases beyond a given threshold value, it is determined that the battery is in a film dry state at this time; when the fixed high-frequency impedance is reduced, and the air or hydrogen pressure measured by a high-precision pressure sensor at the air inlet of the air subsystem or the hydrogen subsystem is increased, comparing the air inlet pressure value calibrated by the system under the working condition, if the air inlet pressure value exceeds a given threshold value, judging that the fuel cell is in a flooding state at the moment, and accordingly, the states of the dry and the flooding of the fuel cell can be respectively judged based on the fixed-frequency impedance and the gas pressure drop rule, and the online monitoring of the dry and the flooding of the fuel cell is realized.
It should be noted that, in the embodiment of the application, the film dry state of the battery is judged by using the constant-frequency impedance, because the film resistance can be approximately described by the high-frequency resistance of the impedance spectrum, the higher the high-frequency resistance is, the lower the proton conductivity of the film is, the lower the water content of the film is, but the accuracy of the impedance measurement method for diagnosing the flooding fault is poor; therefore, the embodiment of the application utilizes the gas pressure drop to judge the flooding of the membrane, when the flooding occurs, the cathode pressure drop is gradually increased until the flooding is balanced, and at the moment, the water on the cathode side reversely permeates to the anode to increase the water content on the anode side due to the influence of the concentration gradient, so that the anode pressure drop is further increased. When film drying occurs, the water content in the film is extremely low and the pressure drop is almost unchanged, so that the film drying cannot be singly characterized by direct pressure drop. The embodiment of the application combines the two methods to make up for the advantages and make up for the advantages, thereby realizing the on-line monitoring of the membrane dryness and the flooding of the fuel cell.
Further, in one embodiment of the present application, when the fuel cell is in a membrane dry state, it further includes: determining a membrane dry state grade to determine a membrane operating parameter adjustment value according to the membrane dry state grade, wherein the operating parameter comprises a stack operating temperature, an outlet flow, a stack pressure, an inlet air humidity and a current density; one or more of the parameters are regulated according to the membrane operating parameter regulation value to slow the degree of membrane dryness.
The film dry state grade can be determined according to the impedance interval of the high-frequency impedance output, so that corresponding measures can be taken according to the film dry degree, the film dry parameter adjustment value corresponds to the film dry state grade, and calibration can be carried out in advance through experiments.
Specifically: when the fuel cell is judged to be in the membrane dry state, the embodiment of the application can reduce the degree of membrane dryness through measures such as reducing the working temperature, reducing the outlet flow, improving the pile pressure, increasing the inlet air humidity, increasing the current density and the like.
Further, in one embodiment of the present application, when the fuel cell is in a flooded state, the method further includes: determining a flooding state grade to determine an operation parameter adjustment value according to the flooding state grade, wherein the operation parameter comprises a pile working temperature, an outlet flow, a pile pressure, an inlet air humidity and a current density; one or more of the parameters are regulated and controlled according to the parameter regulating value so as to slow down the flooding degree.
The flooding state level can be determined according to a pressure interval where a pressure difference between a gas pressure value and a theoretical pressure value is located, so that corresponding measures are taken according to the degree of flooding, the flooding parameter adjustment value corresponds to the flooding state level, and calibration can be performed in advance through experiments.
Specifically, when the fuel cell is judged to be in a membrane dry state, the embodiment of the application can slow down the flooding degree by increasing the working temperature, increasing the outlet flow, reducing the stack pressure, reducing the inlet air humidity, reducing the current density and other measures.
The method for controlling and controlling the water management of the galvanic pile based on the constant frequency impedance and the gas pressure drop will be described with reference to fig. 3, and comprises the following steps:
(1) Measuring the fixed-frequency impedance of the fuel cell and the actual air pressure value at the cathode and the anode;
(2) Respectively judging the states of the dry cell membrane and the flooding cell membrane based on the fixed-frequency impedance and the gas pressure drop law;
(3) When the resistance value increases beyond a given threshold value, the fuel cell is judged to be in a membrane dry state, and the fuel cell enters a humidification mode shown in fig. 4, wherein the membrane dry treatment measures adopted in the humidification mode are shown in table 1; if the set threshold is not exceeded, further judging whether the difference between the actual air pressure value and the theoretical air pressure value (calibration value) exceeds the set threshold, and if the difference does not exceed the set threshold, the fuel cell is in a normal state as shown in fig. 4; if the set threshold is exceeded, it is determined that the fuel cell is in a water removal mode as shown in fig. 4, and the flooding treatment employed in the water removal mode is as shown in table 1. Wherein, table 1 is a treatment measure table for judging film dryness and flooding based on fixed frequency impedance and gas pressure drop law.
TABLE 1
| Treatment measures | Film dry state | Flooding state |
| 1 | Lowering working temperature | Increasing the operating temperature |
| 2 | Reducing outlet flow and improving pile pressure | Increasing outlet flow and reducing stack pressure |
| 3 | Increasing intake air humidity | Reducing intake air humidity |
| 4 | Increasing current density | Reducing current density |
According to the electric pile water management regulation and control method based on the constant frequency impedance and the gas pressure drop, the impedance is used as the index of the film dryness, the film dryness is diagnosed by utilizing the on-line measurement of the ohmic impedance, and the flooding condition is judged by measuring the gas pressure drop when the electric pile is operated, so that the problem that the constant frequency impedance detection is inaccurate in diagnosing the film flooding state is effectively solved, the accurate diagnosis of the film dryness and the flooding can be realized, and the method can be applied on line in real time, and is simple and easy to realize.
Next, a pile water management control device based on fixed frequency impedance and gas pressure drop according to an embodiment of the present application will be described with reference to the accompanying drawings.
FIG. 5 is a block schematic diagram of a galvanic pile water management control device based on fixed frequency impedance and gas pressure drop according to one embodiment of the application.
As shown in fig. 5, the galvanic pile water management control device 10 based on constant frequency impedance and gas pressure drop includes: a measurement module 100, a judgment module 200 and a regulation module 300.
Wherein the measurement module 100 is configured to periodically apply a fixed high-frequency alternating voltage excitation to the stack of the fuel cell by DCDC to measure the high-frequency impedance of the stack; the judging module 200 is used for judging whether the high-frequency impedance is larger than a membrane dry threshold value; the regulation module 300 is configured to determine that the fuel cell is in a membrane dry state if the high-frequency impedance is greater than a membrane dry threshold, or to collect a pressure value of a reaction gas of the fuel cell, and determine that the fuel cell is in a flooded state when the pressure value is greater than a flooding threshold, so as to monitor a current state of the fuel cell on line.
Further, in one embodiment of the present application, when the fuel cell is in the dry state, the regulation module 300 is further configured to determine a dry state level of the membrane to determine a membrane operating parameter adjustment value according to the dry state level of the membrane, wherein the operating parameter includes one or more of a stack operating temperature, an outlet flow rate, a stack pressure, an inlet air humidity, and a current density, and regulate the parameter according to the membrane operating parameter adjustment value to slow the degree of the membrane dry.
Further, in one embodiment of the present application, when the fuel cell is in a flooded state, the regulation module 300 is further configured to determine a flooded state level to determine an operating parameter adjustment value according to the flooded state level, where the operating parameter includes one or more of a stack operating temperature, an outlet flow, a stack pressure, an intake humidity, and a current density, and regulate the parameter according to the operating parameter adjustment value to slow the degree of flooding.
Further, in one embodiment of the present application, the apparatus 10 of the embodiment of the present application further includes: and setting a module. The setting module is used for setting a flooding threshold according to a pressure drop change rule when the fuel cell is in a flooding state.
Further, in one embodiment of the present application, the reaction gas may include hydrogen and air.
It should be noted that the foregoing explanation of the embodiment of the method for controlling water management of a galvanic pile based on fixed frequency impedance and gas pressure drop is also applicable to the device for controlling water management of a galvanic pile based on fixed frequency impedance and gas pressure drop of the embodiment, and will not be repeated here.
According to the electric pile water management regulation device based on the constant frequency impedance and the gas pressure drop, which is provided by the embodiment of the application, the impedance is used as an index of the film dryness, the film dryness is diagnosed by utilizing the on-line measurement of the ohmic impedance, and the flooding condition is judged by measuring the gas pressure drop when the electric pile is operated, so that the problem that the constant frequency impedance detection is inaccurate in diagnosing the film flooding state is effectively solved, the accurate diagnosis of the film dryness and the flooding can be realized, and the device can be applied on line in real time, is simple and easy to realize.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. A galvanic pile water management and control method based on fixed frequency impedance and gas pressure value is characterized by comprising the following steps:
exciting a pile of a fuel cell by applying a fixed high-frequency alternating voltage to the DCDC periodically so as to measure the high-frequency impedance of the pile, wherein the amplitude of the excited signal is 5% -10% of the pile working voltage or current, and the frequency is more than 300 Hz;
judging whether the high-frequency impedance is larger than a membrane dry threshold value or not; and
if the pressure value is larger than the flooding threshold, judging that the fuel cell is in a flooding state so as to monitor the current state of the fuel cell on line;
the reaction gas includes hydrogen and air.
2. The method of claim 1, wherein when the fuel cell is in a membrane dry state, further comprising:
determining a membrane dry state grade to determine a membrane operating parameter adjustment value according to the membrane dry state grade, wherein the operating parameter comprises a stack operating temperature, an outlet flow, a stack pressure, an inlet air humidity and a current density;
and regulating one or more of the operating parameters according to the operating parameter regulating value so as to slow down the dryness of the membrane.
3. The method of claim 1, wherein when the fuel cell is in a flooded state, further comprising:
determining a flooding state grade, and determining a membrane operation parameter adjustment value according to the flooding state grade, wherein the operation parameter comprises a pile working temperature, an outlet flow, pile pressure, air inlet humidity and current density;
and regulating one or more of the operating parameters according to the operating parameter regulating value so as to slow down the flooding degree.
4. The method as recited in claim 1, further comprising:
and setting the flooding threshold according to the pressure drop change rule when the fuel cell is in a flooding state.
5. A galvanic pile water management and control device based on fixed frequency impedance and gas pressure values, comprising:
the measuring module is used for periodically applying fixed high-frequency alternating voltage to the electric pile of the fuel cell through DCDC so as to measure the high-frequency impedance of the electric pile, wherein the amplitude of the excited signal is 5% -10% of the working voltage or current of the electric pile, and the frequency is more than 300 Hz;
the judging module is used for judging whether the high-frequency impedance is larger than a membrane dry threshold value or not; and
the regulation and control module is used for judging that the fuel cell is in a membrane dry state when the high-frequency impedance is larger than the membrane dry threshold, otherwise, collecting the pressure value of the reaction gas of the fuel cell, and judging that the fuel cell is in a flooding state when the pressure value is larger than a flooding threshold so as to monitor the current state of the fuel cell on line;
the reaction gas includes hydrogen and air.
6. The apparatus of claim 5, wherein the regulation module is further configured to determine a membrane dry state rating when the fuel cell is in a membrane dry state, to determine a membrane operating parameter adjustment value based on the membrane dry state rating, wherein the operating parameter comprises one or more of a stack operating temperature, an outlet flow rate, a stack pressure, an inlet air humidity, and a current density, and to regulate one or more of the operating parameters based on the operating parameter adjustment value to slow a degree of membrane dry.
7. The apparatus of claim 5, wherein the regulation module is further configured to determine a flooding status level when the fuel cell is in a flooding status, to determine an operating parameter adjustment based on the flooding status level, wherein the operating parameter includes a stack operating temperature, an outlet flow, a stack pressure, an inlet air humidity, and a current density, and to regulate one or more of the operating parameters based on the operating parameter adjustment to slow the degree of flooding.
8. The apparatus as recited in claim 5, further comprising:
the setting module is used for setting the flooding threshold according to the pressure drop change rule when the fuel cell is in the flooding state.
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| CN114566677B (en) * | 2022-03-04 | 2023-06-02 | 上海重塑能源科技有限公司 | Fuel cell control system and control method thereof |
| CN115663242B (en) * | 2022-11-11 | 2023-12-19 | 苏州氢辀新能源科技有限公司 | Fuel cell detection method and system |
| CN115842142B (en) * | 2022-12-29 | 2024-01-09 | 上海氢晨新能源科技有限公司 | Method and device for controlling anode drainage of fuel cell stack |
| CN116154235B (en) * | 2023-04-20 | 2023-07-11 | 上海重塑能源科技有限公司 | High-power electric pile heat dissipation control method and device, electronic equipment and fuel cell |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101138118A (en) * | 2005-03-09 | 2008-03-05 | 丰田自动车株式会社 | Fuel cell system |
| JP2013109949A (en) * | 2011-11-21 | 2013-06-06 | Denso Corp | Fuel cell system |
| JP2017107771A (en) * | 2015-12-10 | 2017-06-15 | 日産自動車株式会社 | Fuel cell system and method for controlling fuel cell system |
| CN109841879A (en) * | 2019-01-16 | 2019-06-04 | 清华大学 | Fuel cell water content estimating system, method, computer equipment and storage medium |
| CN112490473A (en) * | 2020-10-28 | 2021-03-12 | 广州汽车集团股份有限公司 | Dynamic water management system of electric pile of proton exchange membrane fuel cell and working method thereof |
| CN113161586A (en) * | 2020-10-23 | 2021-07-23 | 同济大学 | Operation control method and system for fuel cell system |
| CN113258106A (en) * | 2021-04-22 | 2021-08-13 | 四川荣创新能动力***有限公司 | Method for judging content of water generated by fuel cell and control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101755923B1 (en) * | 2015-12-09 | 2017-07-10 | 현대자동차주식회사 | Method and system for diagnosing contamination of fuel cell stack |
-
2021
- 2021-09-03 CN CN202111032672.7A patent/CN113782778B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101138118A (en) * | 2005-03-09 | 2008-03-05 | 丰田自动车株式会社 | Fuel cell system |
| JP2013109949A (en) * | 2011-11-21 | 2013-06-06 | Denso Corp | Fuel cell system |
| JP2017107771A (en) * | 2015-12-10 | 2017-06-15 | 日産自動車株式会社 | Fuel cell system and method for controlling fuel cell system |
| CN109841879A (en) * | 2019-01-16 | 2019-06-04 | 清华大学 | Fuel cell water content estimating system, method, computer equipment and storage medium |
| CN113161586A (en) * | 2020-10-23 | 2021-07-23 | 同济大学 | Operation control method and system for fuel cell system |
| CN112490473A (en) * | 2020-10-28 | 2021-03-12 | 广州汽车集团股份有限公司 | Dynamic water management system of electric pile of proton exchange membrane fuel cell and working method thereof |
| CN113258106A (en) * | 2021-04-22 | 2021-08-13 | 四川荣创新能动力***有限公司 | Method for judging content of water generated by fuel cell and control system |
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