CN113497261A - Method and device for determining output power of fuel cell - Google Patents

Method and device for determining output power of fuel cell Download PDF

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Publication number
CN113497261A
CN113497261A CN202010265307.XA CN202010265307A CN113497261A CN 113497261 A CN113497261 A CN 113497261A CN 202010265307 A CN202010265307 A CN 202010265307A CN 113497261 A CN113497261 A CN 113497261A
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output power
fuel cell
preset
determining
temperature
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CN113497261B (en
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贾风
许永亮
洪绍景
胡可
周飞鲲
余俊良
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04305—Modeling, demonstration models of fuel cells, e.g. for training purposes
    • 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
    • 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
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04701—Temperature
    • 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
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

The invention discloses a method and a device for determining the output power of a fuel cell, wherein the method comprises the steps of determining the working temperature of a fuel cell stack to be reached; screening a target current load rate matched with the working temperature, and loading the current of the fuel cell based on the target current load rate to obtain a voltage corresponding to the real-time current; judging whether the difference value of the voltage and a preset voltage single low threshold value is smaller than or equal to a preset voltage difference value, if so, determining the stable output power of the fuel cell, and judging whether the stable output power is larger than or equal to the preset maximum output power of the fuel cell at the working temperature; if so, determining the stable output power as the maximum output power; and adjusting the working temperature, and triggering and executing the operation of keeping the working temperature. Therefore, the optimal power output capacity corresponding to different temperatures in different temperature intervals is determined, so that the power distribution accuracy of the vehicle under different working conditions is improved, the utilization rate of the fuel cell is improved, and the working efficiency of the vehicle is improved.

Description

Method and device for determining output power of fuel cell
Technical Field
The invention relates to the technical field of fuel cells, in particular to a method and a device for determining output power of a fuel cell.
Background
A Fuel Cell (Fuel Cell) is a power generation device that directly converts chemical energy present in a Fuel and an oxidant into electrical energy. With the rapid development of the new energy automobile industry, the fuel cell becomes one of the important technical directions of the new energy automobile. Since the fuel cell and the power cell at the present stage jointly provide power for the vehicle, the distribution of power output is crucial for the whole vehicle.
It has been found that the temperature (including the temperature of the environment in which the fuel cell stack is located and the temperature of the bulk of the fuel cell stack) has a significant effect on the power output capability of the fuel cell, and that the power output capability of the fuel cell varies greatly from temperature to temperature. Therefore, how to determine the optimal power output capacity of the fuel cell at different temperatures so as to improve the power distribution accuracy of the vehicle under different working conditions and further improve the utilization rate of the fuel cell becomes a technical problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and an apparatus for determining output power of a fuel cell, which can determine optimal power output capabilities of the fuel cell corresponding to different temperatures in different temperature intervals, thereby improving power distribution accuracy of a vehicle under different working conditions, and further improving utilization rate of the fuel cell.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention discloses a method for determining output power of a fuel cell, the method including:
determining an operating temperature required to be reached by a fuel cell stack, and maintaining the operating temperature, wherein the operating temperature comprises the temperature of water at an inlet of the stack and the ambient temperature of an ambient tank where the stack is located;
screening a target current load rate matched with the working temperature from a predetermined current load rate set, loading the real-time current of the fuel cell based on the target current load rate, and acquiring a real-time voltage corresponding to the real-time current;
judging whether a voltage difference value between the real-time voltage and a preset voltage single low threshold is smaller than or equal to a preset voltage difference value, when the voltage difference value is judged to be smaller than or equal to the preset voltage difference value, determining stable output power of the fuel cell, and judging whether the stable output power is larger than or equal to a preset maximum output power of the fuel cell at the working temperature;
when the stable output power is judged to be greater than or equal to the preset maximum output power, determining the stable output power as the maximum output power of the fuel cell at the working temperature;
adjusting the working temperature and triggering the operation of maintaining the working temperature.
Therefore, the first aspect of the invention can improve the power distribution accuracy of the vehicle under different working conditions by determining the optimal power output capacities corresponding to different temperatures in different temperature intervals, thereby improving the utilization rate of the fuel cell and improving the working efficiency of the vehicle; the possibility of successful driving of the fuel cell at subzero low temperatures (e.g., -30 ℃) or high temperatures (e.g., 60 ℃) and the reliability can also be improved.
A second aspect of the embodiments of the present invention discloses a determination apparatus of an output power of a fuel cell, the determination apparatus including:
the fuel cell system comprises a determining module, a control module and a control module, wherein the determining module is used for determining an operating temperature which needs to be reached by a galvanic pile of a fuel cell, and the operating temperature comprises a water temperature at an inlet of the galvanic pile and an ambient temperature of an ambient tank where the galvanic pile is located;
a holding module for holding the operating temperature;
the screening module is used for screening a target current load rate matched with the working temperature from a predetermined current load rate set;
a load pulling module for pulling the real-time current of the fuel cell based on the target current load pulling rate;
the acquisition module is used for acquiring real-time voltage corresponding to the real-time current;
the judging module is used for judging whether the voltage difference value of the real-time voltage and the single low threshold value of the preset voltage is smaller than or equal to the preset voltage difference value or not;
the determining module is further configured to determine stable output power of the fuel cell when the determining module determines that the voltage difference is smaller than or equal to the preset voltage difference;
the judging module is further used for judging whether the stable output power is greater than or equal to a preset maximum output power of the fuel cell at the working temperature;
the determining module is further configured to determine the stable output power as the maximum output power of the fuel cell at the operating temperature when the determining module determines that the stable output power is greater than or equal to the preset maximum output power;
and the adjusting module is used for adjusting the working temperature and triggering the maintaining module to execute the operation of maintaining the working temperature.
Therefore, the second aspect of the invention can improve the power distribution accuracy of the vehicle under different working conditions by determining the optimal power output capacities corresponding to different temperatures in different temperature intervals, thereby improving the utilization rate of the fuel cell and improving the working efficiency of the vehicle; the possibility of successful driving of the fuel cell at subzero low temperatures (e.g., -30 ℃) or high temperatures (e.g., 60 ℃) and the reliability can also be improved.
A third aspect of the present invention discloses another determination device of an output power of a fuel cell, the determination device including:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the method for determining the output power of the fuel cell disclosed by the first aspect of the invention.
In a third aspect, the present invention discloses a computer-readable storage medium storing computer instructions for performing the method for determining the output power of a fuel cell as disclosed in the first aspect of the present invention when the computer instructions are invoked.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the embodiment of the invention discloses a method and a device for determining output power of a fuel cell, wherein the method comprises the steps of determining the working temperature to be reached by a galvanic pile of the fuel cell, and keeping the working temperature, wherein the working temperature comprises the water temperature at the inlet of the galvanic pile and the environment temperature of an environment box where the galvanic pile is located; screening a target current load rate matched with the working temperature from a predetermined current load rate set, loading the real-time current of the fuel cell based on the target current load rate, and acquiring the real-time voltage corresponding to the real-time current; judging whether the voltage difference value of the real-time voltage and the single low threshold value of the preset voltage is smaller than or equal to the preset voltage difference value, when the voltage difference value is judged to be smaller than or equal to the preset voltage difference value, determining the stable output power of the fuel cell, and judging whether the stable output power is larger than or equal to the preset maximum output power of the fuel cell at the working temperature; when the stable output power is judged to be greater than or equal to the preset maximum output power, determining the stable output power as the maximum output power of the fuel cell at the working temperature; and adjusting the working temperature and triggering to execute the operation of keeping the working temperature. Therefore, by determining the optimal power output capacity corresponding to different temperatures in different temperature intervals, the power distribution accuracy of the vehicle under different working conditions is improved, the utilization rate of the fuel cell is further improved, and the working efficiency of the vehicle is improved; the possibility of successful driving of the fuel cell at subzero low temperature (e.g., -30 ℃) or high temperature (e.g., -60 ℃) and the reliability can be improved; and the phenomenon that the electric pile is possibly frozen when the fuel cell is requested to output high power at low temperature can be reduced, so that the starting failure of the fuel cell is reduced, the service life of the fuel cell is prolonged, and the service performance of the fuel cell is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for determining output power of a fuel cell according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of another method for determining the output power of a fuel cell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an output power determining apparatus of a fuel cell according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another fuel cell output power determination apparatus disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for determining output power of a fuel cell according to another embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or apparatus that comprises a list of steps or elements is not limited to those listed but may alternatively include other steps or elements not listed or inherent to such process, method, product, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention discloses a method and a device for determining output power of a fuel cell, which can improve the power distribution accuracy of a vehicle under different working conditions by determining the optimal power output capacity corresponding to different temperatures in different temperature intervals, further improve the utilization rate of the fuel cell and the working efficiency of the vehicle, and also improve the possibility and the reliability of successful driving of the fuel cell at low temperature below zero or high temperature; and the phenomenon that the electric pile is possibly frozen when the fuel cell is requested to output high power at low temperature can be reduced, so that the starting failure of the fuel cell is reduced, the service life of the fuel cell is prolonged, and the service performance of the fuel cell is ensured. The following are detailed below.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for determining an output power of a fuel cell according to an embodiment of the present invention. As shown in fig. 1, the method for determining the output power of the fuel cell may include the operations of:
101. determining the working temperature required to be reached by the electric pile of the fuel cell and maintaining the working temperature, wherein the working temperature comprises the temperature of water at the inlet of the electric pile and the ambient temperature of an ambient box where the electric pile is located.
In an embodiment of the present invention, the fuel cell is provided with a temperature sensor by which a water temperature of an inlet of the stack can be measured, wherein the water temperature is a water temperature of a stack coolant inlet.
In the embodiment of the invention, the fuel cell is arranged in a box, the box is an environment box, the environment temperature is the temperature inside the environment box, the environment temperature is adjustable, and the temperature inside the environment box can be adjusted through a corresponding temperature adjusting device of the environment box.
102. And screening a target current load rate matched with the working temperature from a predetermined current load rate set.
In this embodiment of the present invention, as an optional implementation manner, screening a target current loading rate matched with an operating temperature from a predetermined current loading rate set may include:
determining a working temperature interval corresponding to the working temperature from a predetermined temperature interval set;
and screening the current load-pulling rate matched with the working temperature interval from a predetermined current load-pulling rate set to serve as a target current load-pulling rate matched with the working temperature.
In this optional embodiment, the determined set of temperature intervals includes a plurality of temperature intervals, each temperature interval includes a plurality of temperature values, and the temperature values included in each temperature interval are different from each other. Specifically, the temperature interval set includes a low-temperature interval below zero, a low-temperature interval above zero, and a normal temperature interval. Wherein the subzero low temperature interval is a temperature interval which takes the environment temperature of 0 ℃ as a critical temperature point and includes 0 ℃; the subzero low temperature interval is a temperature interval with 0 ℃ as a first endpoint and a preset environment temperature value (for example, 20 ℃) as a second endpoint; the normal temperature interval corresponds to only one ambient temperature value, for example: at 25 ℃. In the embodiment of the present invention, when the working temperature interval corresponding to the working temperature is a low-temperature-below-zero temperature interval or a low-temperature-above-zero temperature interval, the temperature included in the working temperature interval and the environmental temperature have a plurality of temperature values, and the temperature values are the same, for example: the water temperature and the ambient temperature are both-10 ℃, and the water temperature and the ambient temperature are both 15 ℃. When the working temperature range corresponding to the working temperature is the normal temperature range, the ambient temperature included in the working temperature range is only one temperature value, for example: 25 ℃, but which includes water temperatures having a plurality of temperature values, such as: 25 ℃, 30 ℃ and the like. Furthermore, the change of the temperature of the water and the ambient temperature is changed in an arithmetic progression manner.
In the embodiment of the invention, the fuel cell has a corresponding rated current load rate. Wherein the rated current load current is at a rate specified by a manufacturer of the fuel cell. The predetermined current load rate set comprises a plurality of current load rates, and each temperature interval has a corresponding current load rate. Specifically, the current load rate corresponding to the subzero low temperature interval is a first plurality of times (for example, 0 times and the like) of the rated load rate of the fuel cell, that is, when the operating temperature is in the subzero low temperature interval, the target current load rate is 0, that is, when the operating temperature of the fuel cell is in the subzero low temperature interval, the fuel cell operates at a constant current, wherein the constant current is a predetermined current; the current load rate corresponding to the subzero low temperature interval is a second plurality of times (for example, 0.3 times) of the rated load rate of the fuel cell; the current load rate corresponding to the normal temperature interval is third several times (for example, 1.0 time) the rated load rate of the fuel cell. Wherein the first plurality of times is less than the second plurality of times and less than the third plurality of times. Further, each temperature in each temperature interval has a corresponding current load rate. In this way, the accuracy of determining the maximum output power corresponding to each temperature can be improved by allocating the corresponding current load rate to each temperature.
Therefore, in the alternative embodiment, the temperature interval where the temperature corresponding to the fuel cell is located is determined, and the current load rate corresponding to the temperature interval is determined, so that the determination of the current load rate corresponding to the temperature corresponding to the fuel cell is realized, and the determination accuracy of the current load rate corresponding to the temperature is improved.
103. And carrying the real-time current of the fuel cell based on the target current carrying rate, and acquiring the real-time voltage corresponding to the real-time current.
In the embodiment of the present invention, the real-time current of the fuel cell is pulled based on the target current pull-load rate, specifically: the real-time current of the fuel cell is continuously pulled based on the target current pull-load rate. Therefore, the uninterrupted continuous load current is beneficial to maintaining the working temperature of the fuel cell and enabling the output power of the fuel cell to move towards the increasing direction, thereby being beneficial to determining the maximum output power at the working temperature.
In the embodiment of the present invention, the real-time voltage corresponding to the real-time current is obtained, specifically: and acquiring real-time voltage corresponding to the real-time current according to the determined current-voltage characteristics.
104. Judging whether the voltage difference value between the real-time voltage and the preset voltage single low threshold is smaller than or equal to a preset voltage difference value, and triggering to execute the step 105 when the voltage difference value is judged to be smaller than or equal to the preset voltage difference value; and when the voltage difference is larger than the preset voltage difference, continuing to trigger and execute step 103.
In the embodiment of the present invention, the preset voltage single low threshold is a predetermined voltage single low threshold, for example: 0.45V. The voltage single low threshold is a voltage single low threshold corresponding to the condition that the voltage of a certain sheet in the galvanic pile is rapidly reduced due to load pulling and is reduced to a value that the power can not be further increased due to load pulling. Furthermore, each temperature interval has a corresponding voltage single low threshold. Further, the voltage single low threshold corresponding to each temperature interval is the same, for example: all are 0.45V, or the voltage single low threshold corresponding to each temperature interval is different, for example: the voltage single low threshold value corresponding to the subzero low temperature interval is 0.45V; the voltage single low threshold value corresponding to the subzero low temperature interval is 0.47V; the voltage single low threshold corresponding to the normal temperature interval is 0.50V. When the single voltage threshold corresponding to each temperature interval is the same, the preset single voltage threshold should have a sufficient voltage safety margin, and the voltage safety margin is greater than 0, for example: 0.02V.
In yet another alternative embodiment, before performing step 104, the method for determining the output power of the fuel cell may further include the operations of:
acquiring a voltage single low threshold corresponding to the working temperature, determining the voltage single low threshold as a preset voltage single low threshold, and triggering to execute step 104.
In the embodiment of the invention, the identification information of each temperature and the voltage single low threshold of the temperature is preset. Then, a voltage single low threshold corresponding to the operating temperature is obtained, specifically, target identification information of the operating temperature is determined, and the voltage single low threshold corresponding to the operating temperature is determined according to the target identification information. Therefore, the efficiency and the accuracy of determining the voltage single low threshold corresponding to the temperature can be improved.
Therefore, the embodiment of the invention can improve the accuracy of obtaining the voltage single low threshold by obtaining the voltage single low threshold matched with the corresponding temperature of the fuel cell, thereby further improving the accuracy of determining the maximum output power of the fuel cell.
In an alternative embodiment, the method for determining the output power of the fuel cell may further include the operations of:
and calibrating the voltage single low threshold based on a predetermined calibration method to obtain the calibrated voltage single low threshold.
In this optional embodiment, as an optional implementation manner, determining the voltage single low threshold as the preset voltage single low threshold may include:
and determining the calibrated voltage single low threshold as a preset voltage single low threshold.
Therefore, the alternative embodiment can improve the accuracy of obtaining the voltage single low threshold by calibrating the voltage single low threshold, so as to further improve the accuracy of determining the maximum output power of the fuel cell.
105. Determining the stable output power of the fuel cell, and judging whether the stable output power is greater than or equal to the preset maximum output power of the fuel cell at the working temperature; when the stable output power is judged to be greater than or equal to the preset maximum output power, step 106 may be triggered to be executed; and when the stable output power is judged to be smaller than the preset maximum output power, ending the process.
In the embodiment of the present invention, the stable output power of the fuel cell is determined, specifically: the stable output power corresponding to the real-time current may be obtained according to the determined current power characteristic, or the load resistance of the fuel cell at the real-time voltage may be obtained, and the stable output power corresponding to the real-time current may be obtained according to the load resistance and the real-time current, or the stable output power corresponding to the real-time current may be obtained according to the load resistance and the real-time voltage, which is not limited in the embodiment of the present invention.
In the embodiment of the invention, each working temperature of the fuel cell has corresponding preset maximum output power. Specifically, when the operating temperature is a certain operating temperature in the above-mentioned subzero low temperature interval, the corresponding preset maximum output power is at a stable value, for example: 250mA/cm galvanic pile2Corresponding pile power (such as 8.0KW) under current density, namely when the low-temperature starting stage under zero is not finished, the pile power of the fuel cell is constant, and other power requests of the whole vehicle cannot be responded at the moment; when the working temperature is a certain working temperature in the above-zero low-temperature interval or the above-mentioned normal-temperature interval, the corresponding preset maximum output power is a dynamic value, that is, the preset maximum output power corresponding to each working temperature in the above-zero low-temperature interval is different, and the higher the temperature is, the larger the corresponding preset maximum output power is. It should be noted that the preset maximum output powers corresponding to the above-zero low-temperature interval, and the normal-temperature interval are sequentially increased.
106. The stable output power is determined as the maximum output power of the fuel cell at the operating temperature.
In still another alternative embodiment, after determining that the stable output power is greater than or equal to the preset maximum output power in step 105, and before executing step 106, the method for determining the output power of the fuel cell may further include the operations of:
acquiring a target duration of the fuel cell working at the stable output power, and judging whether the target duration reaches a first preset duration threshold (for example, 5 s) corresponding to the working temperature;
and when the target duration is judged to reach the first preset duration threshold, triggering to execute the step 106. Therefore, the alternative embodiment can reduce the occurrence of the situation that the output power is determined as the maximum output power due to the short holding time of the output power of the fuel cell, further improve the accuracy of determining the maximum output power of the fuel cell at the corresponding temperature, and further improve the accuracy of distributing the output power of the fuel cell and the power cell.
In yet another alternative embodiment, the method of determining the output power of the fuel cell may further include the operations of:
when it is determined that the target duration does not reach the preset duration threshold, decreasing the preset maximum output power to obtain a first preset maximum output power, and decreasing a target current pull-loading rate to obtain a first target current pull-loading rate, and triggering to execute step 103, where the target current pull-loading rate is the first target current pull-loading rate, and the first target current pull-loading rate is equal to a first preset percentage (e.g., 90%) of the target current pull-loading rate.
And judging whether the stable output power is larger than or equal to a preset maximum output power in preset maximum output powers corresponding to the working temperature or not, wherein the preset maximum output power is a first preset maximum output power, and the first preset maximum output power is equal to a second preset percentage (for example, 80%) of the preset maximum output power.
Therefore, in the optional embodiment, when the duration of the operating temperature of the fuel cell is determined to be short, the preset maximum output power and the current load rate of the fuel cell are reduced under the condition of the operating temperature, and the subsequent load current operation is executed again, so that the possibility of obtaining the maximum output power at the corresponding temperature can be improved, and the calibration of the maximum output capacity at the temperature can be completed.
In yet another alternative embodiment, after triggering the above-described operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature, the method of determining the output power of the fuel cell may further include the operations of:
and monitoring the target duration of the fuel cell working at the stable output power, and determining a target preset duration threshold corresponding to the target duration as a calibrated working duration of the fuel cell outputting the stable output power at the working temperature when the fuel cell is working at the output power lower than the stable output power.
In this optional embodiment, the target preset duration threshold includes any one of a first preset duration threshold, a second preset duration threshold, and a third preset duration threshold. Wherein the first preset duration threshold is smaller than the second preset duration threshold, and the second preset duration threshold is smaller than the third preset duration threshold, for example: the first preset duration threshold, the second preset duration threshold and the third preset duration threshold are 5s, 10s and 20s in sequence. Furthermore, each working temperature has a corresponding first preset duration threshold, a corresponding second preset duration threshold, and a corresponding third preset duration threshold, and the corresponding first preset duration threshold, the corresponding second preset duration threshold, and the corresponding third preset duration threshold of each working temperature are different.
In this alternative embodiment, for example, the first preset duration threshold, the second preset duration threshold and the third preset duration threshold are 5s, 10s and 20s in sequence, and when the target duration of the fuel cell operating at the stable output power of 30Kw is 5s to 10s, but does not include 10s, the target duration of the fuel cell operating at the stable output power of 30Kw is 5 s; when the target duration of time for which the fuel cell is operated at the stable output power of 30Kw is 10s to 20s, but does not include 20s, the target duration of time for which the fuel cell is operated at the stable output power of 30Kw is 10 s; when the target duration of time for which the fuel cell is operated at the 30Kw stable output power is greater than 20s, including 20s, then the target duration of time for which the fuel cell is operated at the 30Kw stable output power is 20 s.
Therefore, in the optional embodiment, by monitoring the duration of the fuel cell working at the stable output power at the corresponding working temperature and determining the preset duration corresponding to the duration as the calibration duration of the fuel cell working at the stable output power at the corresponding working temperature, the accuracy of obtaining the calibration duration of the fuel cell working at the stable output power at the corresponding working temperature can be improved, so that the distribution accuracy of the output power of the whole vehicle under different working conditions is improved, and the power performance of the whole vehicle is further improved.
107. Adjusting the working temperature and triggering the operation of maintaining the working temperature.
In the embodiment of the present invention, the change mode of the operating temperature may be changed according to a rule from low temperature to high temperature, for example: the change in water temperature for the corresponding operating temperature of the fuel cell varies from-40 ℃ to 60 ℃. Therefore, the calibration efficiency of the maximum output power of the fuel cell at other temperatures is improved, and the acquisition efficiency of all the maximum output power of the fuel cell at multiple temperature sections is improved.
In yet another alternative embodiment, the method for determining the output power of the fuel cell may further include the steps of:
and counting the maximum output power corresponding to each working temperature interval, associating each working temperature interval with the maximum output power corresponding to the working temperature interval to obtain associated information, and storing all the associated information.
It can be seen that, by associating each temperature interval with the maximum output power of the temperature interval and storing the association information, the alternative embodiment can quickly locate the corresponding maximum output power through the temperature, thereby further improving the accuracy of power distribution between the fuel cell and the power cell.
In yet another alternative embodiment, the method of determining the output power of the fuel cell may further include the operations of:
when the stable output power is judged to be smaller than the preset maximum output power, reducing the preset maximum output power to obtain a second preset maximum output power, reducing the target current load rate to obtain a second target current load rate, and triggering to execute the step 103, wherein the target current load rate is the second target current load rate;
and judging whether the stable output power is greater than or equal to a second preset maximum output power in the preset maximum output powers corresponding to the working temperature.
In this alternative embodiment, when the stable output power is judged to be less than the preset maximum output power, that is, when the power output by the fuel cell is greater than the preset maximum output power, the real-time voltage of the fuel cell is less than or equal to the single-bottom threshold of the preset voltage,
in this optional embodiment, for the related descriptions of the second preset maximum output power and the second target current carrying rate, reference is made to the above detailed descriptions of the first preset maximum output power and the first target current carrying rate, which are not repeated herein. The second preset maximum output power may be equal to the first preset maximum output power, or may not be equal to the first preset maximum output power.
Therefore, in the optional embodiment, when it is determined that the output power of the fuel cell is greater than or equal to the preset maximum output power at the operating temperature, and when the real-time voltage of the fuel cell is lower than the preset voltage threshold, the preset maximum output power and the current load rate of the fuel cell are reduced under the condition of the operating temperature, and the subsequent load current pulling operation is executed again, so that the possibility of obtaining the maximum output power at the corresponding temperature can be improved, and the calibration of the maximum output capacity at the temperature is completed.
In yet another alternative embodiment, the method of determining the output power of the fuel cell may further include the operations of:
and manufacturing a MAP (MAP of MAP) of the fuel cell based on each working temperature of the fuel cell, the stable output power corresponding to the working temperature and the calibration working time corresponding to the stable output power.
Therefore, in the optional embodiment, the maximum output power of the fuel cell at each working temperature and the corresponding MAP graph of the working duration are formulated, so that the power output condition of the fuel cell can be intuitively and clearly known, the power distribution of the whole vehicle according to the MAP graph is further facilitated, and the power distribution accuracy of the whole vehicle is further improved.
It can be seen that, by implementing the method for determining the output power of the fuel cell described in fig. 1, the power distribution accuracy of the vehicle under different working conditions can be improved by determining the optimal power output capabilities corresponding to different temperatures in different temperature intervals, so that the utilization rate of the fuel cell and the working efficiency of the vehicle are improved; the possibility and the reliability of the fuel cell for successfully driving under the low temperature below zero (such as minus 30 ℃) or the high temperature (such as 60 ℃) can be improved, and the phenomenon that the electric pile is possibly frozen when the fuel cell is requested to output high power under the low temperature can be reduced, so that the starting failure of the fuel cell can be reduced, the service life of the fuel cell can be prolonged, and the service performance of the fuel cell can be ensured.
Example two
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating another method for determining the output power of the fuel cell according to the embodiment of the present invention. As shown in fig. 2, the method for determining the output power of the fuel cell may include the operations of:
201. determining the working temperature required to be reached by the electric pile of the fuel cell and maintaining the working temperature, wherein the working temperature comprises the temperature of water at the inlet of the electric pile and the ambient temperature of an ambient box where the electric pile is located.
202. And screening a target current load rate matched with the working temperature from a predetermined current load rate set.
203. Judging whether the working temperature is a certain working temperature in a preset temperature interval or not; when the working temperature is not determined to be a certain working temperature, step 205 is triggered; when the working temperature is determined to be a certain working temperature, step 204 is triggered.
In an embodiment of the present invention, the preset temperature interval is the subzero low temperature interval. The target startup program is a program prepared in advance.
In the embodiment of the present invention, it should be noted that step 203 may also occur simultaneously with step 202.
204. A target start-up procedure corresponding to the preset temperature interval is acquired, and the fuel cell is started based on the target start-up procedure, and step 205 is triggered.
Therefore, when the current of the fuel cell is loaded, the embodiment of the invention firstly judges whether the working temperature of the fuel cell is a certain working temperature in a specific temperature interval, if so, the fuel cell is started based on the starting program, and the real-time current of the fuel cell is loaded, so that the possibility of successful starting of the fuel cell and the loading accuracy can be improved, the acquisition accuracy of the power output capability of the fuel cell is further improved, and the power distribution accuracy of the whole vehicle is further improved.
205. And carrying the real-time current of the fuel cell based on the target current carrying rate, and acquiring the real-time voltage corresponding to the real-time current.
206. Judging whether the voltage difference value between the real-time voltage and the preset voltage single low threshold is smaller than or equal to a preset voltage difference value, and triggering to execute the step 207 when the voltage difference value is judged to be smaller than or equal to the preset voltage difference value; when the voltage difference is greater than the preset voltage difference, the step 206 is triggered to be executed.
207. Determining the stable output power of the fuel cell, and judging whether the stable output power is greater than or equal to the preset maximum output power of the fuel cell at the working temperature; when the stable output power is determined to be greater than or equal to the preset maximum output power, step 208 may be triggered to be executed; and when the stable output power is judged to be smaller than the preset maximum output power, ending the process.
208. The stable output power is determined as the maximum output power of the fuel cell at the operating temperature.
209. Adjusting the working temperature and triggering the operation of maintaining the working temperature.
In the embodiment of the present invention, for the related descriptions of step 201, step 202, and steps 205 to step 209, refer to the detailed descriptions of step 101 to step 107 in the first embodiment, which is not repeated herein.
It can be seen that, by implementing the method for determining the output power of the fuel cell described in fig. 2, the optimal power output capability corresponding to different temperatures in different temperature intervals can be determined, so that the power distribution accuracy of the vehicle under different working conditions is improved, the utilization rate of the fuel cell is improved, the working efficiency of the vehicle is improved, and the phenomenon that the electric pile may be frozen due to the fact that the fuel cell is requested to output high power at a low temperature can be reduced, thereby being beneficial to reducing the occurrence of the start failure of the fuel cell, prolonging the service life of the fuel cell, and ensuring the use performance of the fuel cell; the possibility of successful starting of the fuel cell and the pulling load accuracy can be improved, so that the acquisition accuracy of the power output capacity of the fuel cell is further improved, and the power distribution accuracy of the whole vehicle is further improved.
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic structural diagram of a device for determining output power of a fuel cell according to an embodiment of the present invention. As shown in fig. 3, the apparatus for determining the output power of the fuel cell may include a determination module 301, a holding module 302, a screening module 303, a pull-loading module 304, an obtaining module 305, a determining module 306, and an adjusting module 307, wherein:
the determining module 301 is used for determining the working temperature which needs to be reached by the electric pile of the fuel cell, wherein the working temperature comprises the water temperature at the inlet of the electric pile and the ambient temperature of an ambient box where the electric pile is located.
A maintaining module 302 for maintaining an operating temperature.
And the screening module 303 is configured to screen a target current loading rate matched with the operating temperature from a predetermined set of current loading rates.
A pull-up module 304 for pulling up the real-time current of the fuel cell based on the target current pull-up rate.
The obtaining module 305 is configured to obtain a real-time voltage corresponding to the real-time current.
The determining module 306 is configured to determine whether a voltage difference between the real-time voltage and the preset voltage single low threshold is smaller than or equal to a preset voltage difference.
The determining module 301 is further configured to determine a stable output power of the fuel cell when the determining module 306 determines that the voltage difference is smaller than or equal to the preset voltage difference.
The determining module 306 is further configured to determine whether the stable output power is greater than or equal to a preset maximum output power of the fuel cell at the operating temperature.
The determining module 301 is further configured to determine the stable output power as the maximum output power of the fuel cell at the operating temperature when the determining module 301 determines that the stable output power is greater than or equal to the preset maximum output power.
The adjusting module 307 is configured to adjust the operating temperature and trigger the maintaining module 302 to perform the operation of maintaining the operating temperature.
In an embodiment of the present invention, after the determining module 301 completes the above operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature, the adjusting module 307 may be triggered to perform the above operation of adjusting the operating temperature.
It can be seen that, by implementing the apparatus for determining the output power of the fuel cell described in fig. 3, the power distribution accuracy of the vehicle under different working conditions can be improved by determining the optimal power output capabilities corresponding to different temperatures in different temperature ranges, so as to improve the utilization rate of the fuel cell and improve the working efficiency of the vehicle; the method can also improve the possibility and reliability of the successful driving of the fuel cell at low temperature below zero or high temperature, and can also reduce the possibility of icing phenomenon of the electric pile caused by requesting the fuel cell to output high power at low temperature, thereby being beneficial to reducing the starting failure of the fuel cell, prolonging the service life of the fuel cell and ensuring the service performance of the fuel cell.
In an alternative embodiment, as shown in fig. 3, the obtaining module 305 is further configured to obtain the target duration of the fuel cell operating at the stable output power after the determining module 306 determines that the stable output power is greater than or equal to the preset maximum output power and before the determining module 301 determines that the stable output power is the maximum output power of the fuel cell at the operating temperature.
The determining module 306 is further configured to determine whether the target duration reaches a first preset duration threshold corresponding to the operating temperature, and when it is determined that the target duration reaches the first preset duration threshold, trigger the determining module 301 to perform the above-mentioned operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature.
It can be seen that, by implementing the apparatus for determining the output power of the fuel cell described in fig. 3, it is possible to determine whether the duration of the output power of the fuel cell reaches the predetermined duration, and if so, perform the subsequent operation of determining that the output power is the maximum output power at the corresponding temperature, thereby reducing the occurrence of determining that the output power is the maximum output power due to the short duration of the output power of the fuel cell, further improving the accuracy of determining the maximum output power of the fuel cell at the corresponding temperature, and further improving the accuracy of allocating the output powers of the fuel cell and the power cell.
In an alternative embodiment, based on the determining apparatus of the output power of the fuel cell described in fig. 3, the determining apparatus of the output power of the fuel cell may further include a first control module 308, in this case, the determining apparatus of the output power of the fuel cell may be as shown in fig. 4, and fig. 4 is a schematic structural diagram of another determining apparatus of the output power of the fuel cell, where:
the first control module 308 is configured to reduce the preset maximum output power to obtain a first preset maximum output power when the determining module 306 determines that the target duration does not reach the preset duration threshold.
The first control module 308 is further configured to reduce the target current loading rate to obtain a first target current loading rate, and trigger the loading module 304 to perform the current loading operation of the fuel cell based on the target current loading rate, where the target current loading rate is the first target current loading rate.
And judging whether the stable output power is greater than or equal to a first preset maximum output power in preset maximum output powers corresponding to the working temperature or not.
It can be seen that, by implementing the apparatus for determining the output power of the fuel cell described in fig. 4, when it is determined that the duration of the operating temperature of the fuel cell is short, the apparatus can reduce the corresponding preset maximum output power and the current load rate thereof under the condition of the operating temperature, and re-execute the subsequent operation of pulling the load current, so as to improve the possibility of obtaining the maximum output power at the corresponding temperature, and further complete the calibration of the maximum output capability at the temperature.
In yet another alternative embodiment, as shown in fig. 4, the determining means of the output power of the fuel cell may further include a monitoring module 309, wherein:
a monitoring module 309 for monitoring a target duration of operation of the fuel cell at the stable output power after triggering the determining module 301 to perform the above-described operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature.
The determining module 301 is further configured to determine a target preset duration threshold corresponding to the target duration when the fuel cell operates at a power lower than the stable output power, where the target preset duration threshold includes any one of a first preset duration threshold, a second preset duration threshold, and a third preset duration threshold.
The determining module 301 is further configured to determine a target preset duration threshold as a calibrated operating duration of the fuel cell outputting the stable output power at the operating temperature.
The first preset duration threshold is smaller than the second preset duration threshold, and the second preset duration threshold is smaller than the third preset duration threshold.
It can be seen that, by monitoring the duration of the fuel cell operating at the stable output power at the corresponding operating temperature and determining the preset duration corresponding to the duration as the calibration duration of the fuel cell operating at the stable output power at the corresponding operating temperature, the apparatus for determining the output power of the fuel cell described in fig. 4 can improve the accuracy of obtaining the calibration duration of the fuel cell operating at the stable output power at the corresponding operating temperature, thereby improving the accuracy of allocating the output power of the entire vehicle under different operating conditions and further improving the power performance of the entire vehicle.
In yet another alternative embodiment, as shown in fig. 4, the apparatus for determining the output power of the fuel cell may further include a making module 310, wherein:
the creating module 310 is configured to create a MAP of the fuel cell based on each operating temperature of the fuel cell, the stable output power corresponding to the operating temperature, and the calibrated operating duration corresponding to the stable output power.
It can be seen that, by setting up the MAP of the maximum output power of the fuel cell at each operating temperature and the corresponding operating duration of the fuel cell, the determination apparatus for determining the output power of the fuel cell described in fig. 4 can also intuitively and clearly know the power output condition of the fuel cell, thereby further facilitating the power distribution of the entire vehicle according to the MAP, and further improving the power distribution accuracy of the entire vehicle.
In yet another alternative embodiment, as shown in fig. 4, the apparatus for determining the output power of the fuel cell may further include a second control module 311, wherein:
the second control module 311 is configured to reduce the preset maximum output power to obtain a second preset maximum output power when the determining module determines that the stable output power is smaller than the preset maximum output power.
The second control module 311 is further configured to reduce the target current loading rate to obtain a second target current loading rate, and trigger the determining module 301 to perform the current operation of loading the fuel cell based on the target current loading rate, where the target current loading rate is the second target current loading rate.
And judging whether the stable output power is greater than or equal to a second preset maximum output power in the preset maximum output powers corresponding to the working temperature.
It can be seen that, by implementing the apparatus for determining the output power of the fuel cell described in fig. 4, when it is determined that the output power of the fuel cell is greater than or equal to the preset maximum output power at the operating temperature, and when the real-time voltage of the fuel cell is lower than the preset voltage threshold, the fuel cell is kept at the operating temperature, the corresponding preset maximum output power and the current load rate thereof are reduced, and the subsequent load current pulling operation is executed again, so that the possibility of obtaining the maximum output power at the corresponding temperature can be improved, and the calibration of the maximum output capability at the temperature can be completed.
In yet another alternative embodiment, as shown in fig. 4, the apparatus for determining the output power of the fuel cell may further include a starting module 312, wherein:
the determining module 306 is further configured to determine whether the operating temperature is a certain operating temperature in a preset temperature range before the load module 304 loads the real-time current of the fuel cell based on the target current load rate, and trigger the load module 304 to perform the above-mentioned operation of loading the real-time current of the fuel cell based on the target current load rate when the operating temperature is determined not to be the certain operating temperature.
The obtaining module 305 is further configured to obtain a target start program corresponding to the preset temperature interval when the determining module 306 determines that the working temperature is a certain working temperature.
The start module 312 is used to start the fuel cell based on the target start program and trigger the pull-load module 304 to perform the above-mentioned operation of pulling the real-time current of the fuel cell based on the target current pull-load rate.
It can be seen that, implementing the apparatus for determining the output power of the fuel cell described in fig. 4 can also improve the possibility of successful start-up and the pull-up accuracy of the fuel cell by determining whether the operating temperature of the fuel cell is a certain operating temperature in a specific temperature range when the current of the fuel cell is pulled up, and if so, starting the fuel cell based on the start-up program and pulling up the real-time current of the fuel cell.
In yet another alternative embodiment, as shown in fig. 4, the screening module 303 screens the target current loading rate matching the operating temperature from the predetermined set of current loading rates specifically by:
determining a working temperature interval corresponding to the working temperature from a predetermined temperature interval set;
and screening the current load-pulling rate matched with the working temperature interval from a predetermined current load-pulling rate set to serve as a target current load-pulling rate matched with the working temperature.
In this optional embodiment, the determined set of temperature intervals includes a plurality of temperature intervals, each temperature interval includes a plurality of temperature values, and the temperature values included in each temperature interval are different from each other.
It can be seen that, by implementing the apparatus for determining the output power of the fuel cell described in fig. 4, the temperature interval in which the temperature corresponding to the fuel cell is located can be determined first, and the current load rate corresponding to the temperature interval can be determined, so that the determination of the current load rate corresponding to the temperature corresponding to the fuel cell is achieved, and the accuracy of determining the current load rate corresponding to the temperature is improved.
In yet another alternative embodiment, as shown in fig. 4, the obtaining module 305 is further configured to obtain the voltage single low threshold corresponding to the operating temperature before the determining module 306 determines whether the voltage difference between the real-time voltage and the preset voltage single low threshold is less than or equal to the preset voltage difference.
The determining module 301 is further configured to determine that the voltage single low threshold is the preset voltage single low threshold, and trigger the determining module 306 to perform the above operation of determining whether the voltage difference between the real-time voltage and the preset voltage single low threshold is smaller than or equal to the preset voltage difference.
It can be seen that the implementation of the apparatus for determining the output power of the fuel cell described in fig. 4 can also improve the accuracy of obtaining the voltage single low threshold by obtaining the voltage single low threshold matching the corresponding temperature of the fuel cell, thereby further improving the accuracy of determining the maximum output power of the fuel cell.
Example four
Referring to fig. 5, fig. 5 is a schematic diagram of another apparatus for determining output power of a fuel cell according to an embodiment of the present invention. As shown in fig. 5, the determination means of the output power of the fuel cell may include:
a memory 501 in which executable program code is stored;
a processor 502 coupled to a memory 501;
the processor 502 calls the executable program code stored in the memory 501 for executing the steps in the determination method of the output power of the fuel cell described in the first embodiment or the second embodiment.
EXAMPLE five
An embodiment of the present invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to execute the steps in the determination method of the output power of a fuel cell described in the first or second embodiment.
EXAMPLE six
An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the steps in the determination method of the output power of a fuel cell described in the first or second embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, may be located in one place, or may be distributed on 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 the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, where the storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc-Read-Only Memory (CD-ROM), or other disk memories, CD-ROMs, or other magnetic disks, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
Finally, it should be noted that: the method and apparatus for determining the output power of a fuel cell disclosed in the embodiments of the present invention are only disclosed as preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, rather than limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (20)

1. A method of determining an output power of a fuel cell, the method comprising:
determining an operating temperature required to be reached by a fuel cell stack, and maintaining the operating temperature, wherein the operating temperature comprises the temperature of water at an inlet of the stack and the ambient temperature of an ambient tank where the stack is located;
screening a target current load rate matched with the working temperature from a predetermined current load rate set, loading the real-time current of the fuel cell based on the target current load rate, and acquiring a real-time voltage corresponding to the real-time current;
judging whether a voltage difference value between the real-time voltage and a preset voltage single low threshold is smaller than or equal to a preset voltage difference value, when the voltage difference value is judged to be smaller than or equal to the preset voltage difference value, determining stable output power of the fuel cell, and judging whether the stable output power is larger than or equal to a preset maximum output power of the fuel cell at the working temperature;
when the stable output power is judged to be greater than or equal to the preset maximum output power, determining the stable output power as the maximum output power of the fuel cell at the working temperature;
adjusting the working temperature and triggering the operation of maintaining the working temperature.
2. The method for determining the output power of the fuel cell according to claim 1, wherein after determining that the stable output power is equal to or greater than the preset maximum output power and before the determining that the stable output power is the maximum output power of the fuel cell at the operating temperature, the method further comprises:
acquiring a target duration of the fuel cell working at the stable output power, and judging whether the target duration reaches a first preset duration threshold corresponding to the working temperature;
and when the target duration is judged to reach the first preset duration threshold, triggering and executing the operation of determining the stable output power as the maximum output power of the fuel cell at the working temperature.
3. The method of determining the output power of the fuel cell according to claim 2, characterized by further comprising:
when the target duration is judged to not reach the preset duration threshold, reducing the preset maximum output power to obtain a first preset maximum output power, reducing the target current load rate to obtain a first target current load rate, and triggering and executing the current operation of loading the fuel cell based on the target current load rate, wherein the target current load rate is the first target current load rate;
and judging whether the stable output power is greater than or equal to the preset maximum output power in the preset maximum output power corresponding to the working temperature, wherein the preset maximum output power is the first preset maximum output power.
4. The method for determining the output power of the fuel cell according to claim 2 or 3, wherein after the triggering execution of the operation for determining the stable output power as the maximum output power of the fuel cell at the operating temperature, the method further comprises:
monitoring the target duration of the fuel cell operating at the stable output power, and determining a target preset duration threshold corresponding to the target duration when the fuel cell operates at a power lower than the stable output power, wherein the target preset duration threshold comprises any one of the first preset duration threshold, the second preset duration threshold and the third preset duration threshold;
determining the target preset duration threshold as a calibrated working duration of the fuel cell outputting the stable output power at the working temperature;
the first preset duration threshold is smaller than the second preset duration threshold, and the second preset duration threshold is smaller than the third preset duration threshold.
5. The method of determining the output power of the fuel cell according to claim 4, characterized by further comprising:
and manufacturing a MAP of the fuel cell based on each working temperature of the fuel cell, the stable output power corresponding to the working temperature and the calibration working time corresponding to the stable output power.
6. The method of determining the output power of the fuel cell according to any one of claims 1 to 5, characterized by further comprising:
when the stable output power is judged to be smaller than the preset maximum output power, reducing the preset maximum output power to obtain a second preset maximum output power, reducing the target current load rate to obtain a second target current load rate, and triggering and executing the current operation of loading the fuel cell based on the target current load rate, wherein the target current load rate is the second target current load rate;
and judging whether the stable output power is greater than or equal to the second preset maximum output power in the preset maximum output powers corresponding to the working temperature.
7. The method of determining the output power of the fuel cell according to any one of claims 1 to 6, wherein before the pulling the real-time current of the fuel cell based on the target current pulling rate, the method further comprises:
judging whether the working temperature is a certain working temperature in a preset temperature interval or not;
when the working temperature is judged not to be the certain working temperature, triggering and executing the operation of carrying the real-time current of the fuel cell based on the target current carrying rate;
and when the working temperature is judged to be the certain working temperature, acquiring a target starting program corresponding to the preset temperature interval, starting the fuel cell based on the target starting program, and triggering and executing the operation of pulling the real-time current of the fuel cell based on the target current pulling rate.
8. The method for determining the output power of the fuel cell according to any one of claims 1 to 7, wherein the screening of the target current pull-up rate matching the operating temperature from the predetermined set of current pull-up rates includes:
determining a working temperature interval corresponding to the working temperature from a predetermined temperature interval set;
and screening the current load-pulling rate matched with the working temperature interval from a predetermined current load-pulling rate set to serve as a target current load-pulling rate matched with the working temperature.
9. The method according to claim 8, wherein the set of determined temperature intervals includes a plurality of temperature intervals, each of the temperature intervals includes a plurality of temperature values, and the temperature values included in each of the temperature intervals are different from each other.
10. The method for determining the output power of the fuel cell according to any one of claims 1 to 9, wherein before the determining whether the voltage difference between the real-time voltage and the preset voltage threshold is less than or equal to the preset voltage difference, the method further comprises:
and acquiring a voltage single low threshold corresponding to the working temperature, determining the voltage single low threshold as a preset voltage single low threshold, and triggering and executing the operation of judging whether the voltage difference value between the real-time voltage and the preset voltage single low threshold is less than or equal to the preset voltage difference value.
11. A determination device of an output power of a fuel cell, characterized by comprising:
the fuel cell system comprises a determining module, a control module and a control module, wherein the determining module is used for determining an operating temperature which needs to be reached by a galvanic pile of a fuel cell, and the operating temperature comprises a water temperature at an inlet of the galvanic pile and an ambient temperature of an ambient tank where the galvanic pile is located;
a holding module for holding the operating temperature;
the screening module is used for screening a target current load rate matched with the working temperature from a predetermined current load rate set;
a load pulling module for pulling the real-time current of the fuel cell based on the target current load pulling rate;
the acquisition module is used for acquiring real-time voltage corresponding to the real-time current;
the judging module is used for judging whether the voltage difference value of the real-time voltage and the single low threshold value of the preset voltage is smaller than or equal to the preset voltage difference value or not;
the determining module is further configured to determine stable output power of the fuel cell when the determining module determines that the voltage difference is smaller than or equal to the preset voltage difference;
the judging module is further used for judging whether the stable output power is greater than or equal to a preset maximum output power of the fuel cell at the working temperature;
the determining module is further configured to determine the stable output power as the maximum output power of the fuel cell at the operating temperature when the determining module determines that the stable output power is greater than or equal to the preset maximum output power;
and the adjusting module is used for adjusting the working temperature and triggering the maintaining module to execute the operation of maintaining the working temperature.
12. The apparatus for determining the output power of the fuel cell according to claim 11, wherein the obtaining module is further configured to obtain a target duration for the fuel cell to operate at the stable output power after the determining module determines that the stable output power is equal to or greater than the preset maximum output power and before the determining module determines that the stable output power is the maximum output power of the fuel cell at the operating temperature;
the judging module is further configured to judge whether the target duration reaches a first preset duration threshold corresponding to the operating temperature, and when it is judged that the target duration reaches the first preset duration threshold, trigger the determining module to perform the operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature.
13. The apparatus for determining the output power of the fuel cell according to claim 12, characterized in that the apparatus for determining further comprises:
the first control module is used for reducing the preset maximum output power to obtain a first preset maximum output power when the judging module judges that the target duration does not reach the preset duration threshold;
the first control module is further configured to reduce the target current load rate, obtain a first target current load rate, and trigger the load module to execute the current operation of loading the fuel cell based on the target current load rate, where the target current load rate is the first target current load rate;
and judging whether the stable output power is greater than or equal to the preset maximum output power in the preset maximum output power corresponding to the working temperature, wherein the preset maximum output power is the first preset maximum output power.
14. The determination device of the output power of the fuel cell according to claim 12 or 13, characterized by further comprising:
a monitoring module for monitoring the target duration of operation of the fuel cell at the stable output power after triggering the determination module to perform the operation of determining the stable output power as the maximum output power of the fuel cell at the operating temperature;
the determining module is further configured to determine a target preset duration threshold corresponding to the target duration when the fuel cell operates at a power lower than the stable output power, where the target preset duration threshold includes any one of the first preset duration threshold, the second preset duration threshold, and the third preset duration threshold;
the determining module is further configured to determine the target preset duration threshold as a calibrated operating duration for the fuel cell to output the stable output power at the operating temperature;
the first preset duration threshold is smaller than the second preset duration threshold, and the second preset duration threshold is smaller than the third preset duration threshold.
15. The apparatus for determining the output power of the fuel cell according to claim 14, characterized by further comprising:
and the manufacturing module is used for manufacturing the MAP of the fuel cell based on each working temperature of the fuel cell, the stable output power corresponding to the working temperature and the calibration working duration corresponding to the stable output power.
16. The output power determination device of the fuel cell according to any one of claims 11 to 15, characterized by further comprising:
the second control module is used for reducing the preset maximum output power to obtain a second preset maximum output power when the judging module judges that the stable output power is smaller than the preset maximum output power;
the second control module is further configured to reduce the target current loading rate, obtain a second target current loading rate, and trigger the determination module to execute the current operation of loading the fuel cell based on the target current loading rate, where the target current loading rate is the second target current loading rate;
and judging whether the stable output power is greater than or equal to the second preset maximum output power in the preset maximum output powers corresponding to the working temperature.
17. The output power determination device of the fuel cell according to any one of claims 11 to 16, characterized by further comprising:
the judging module is further configured to judge whether the operating temperature is a certain operating temperature in a preset temperature range before the load-pulling module loads the real-time current of the fuel cell based on the target current load-pulling rate, and when the operating temperature is judged not to be the certain operating temperature, trigger the load-pulling module to execute the operation of loading the real-time current of the fuel cell based on the target current load-pulling rate;
the obtaining module is further configured to obtain a target starting program corresponding to the preset temperature interval when the judging module judges that the working temperature is the certain working temperature;
and the starting module is used for starting the fuel cell based on the target starting program and triggering the load pulling module to execute the operation of pulling the real-time current of the fuel cell based on the target current load pulling rate.
18. The apparatus for determining an output power of a fuel cell according to any one of claims 11 to 17, wherein the screening module screens the target current draw rate matching the operating temperature from a predetermined set of current draw rates in particular by:
determining a working temperature interval corresponding to the working temperature from a predetermined temperature interval set;
and screening the current load-pulling rate matched with the working temperature interval from a predetermined current load-pulling rate set to serve as a target current load-pulling rate matched with the working temperature.
19. The apparatus for determining output power of a fuel cell according to any one of claims 11 to 18, wherein the obtaining module is further configured to obtain a voltage single low threshold corresponding to the operating temperature before the determining module determines whether the voltage difference between the real-time voltage and the preset voltage single low threshold is less than or equal to the preset voltage difference;
the determining module is further configured to determine that the voltage single low threshold is a preset voltage single low threshold, and trigger the determining module to perform the operation of determining whether a voltage difference value between the real-time voltage and the preset voltage single low threshold is less than or equal to the preset voltage difference value.
20. A determination device of an output power of a fuel cell, characterized by comprising:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the method of determining the output power of the fuel cell according to any one of claims 1 to 10.
CN202010265307.XA 2020-04-07 2020-04-07 Method and device for determining output power of fuel cell Active CN113497261B (en)

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