Starting-up purging method and device of fuel cell, fuel cell system and medium

Abstract

The invention discloses a startup purging method and device of a fuel cell, a fuel cell system and a medium. The method comprises the following steps: responding to a starting instruction of a fuel cell, and obtaining shutdown placement duration of the fuel cell; determining a target startup purging duration according to the shutdown placement duration; and performing startup purging on the fuel cell based on the target startup purging duration. Therefore, starting-up purging is performed on the fuel cell based on the target starting-up purging duration, it can be ensured that the fuel cell has sufficient hydrogen supply concentration, the starting-up purging duration of the fuel cell is optimized, and the energy consumption of the fuel cell is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell startup purge method, device, fuel cell system and medium. Background Art

[0002] During use, the fuel cell system needs to be supplied with sufficient hydrogen and oxygen to undergo various reactions to generate electricity. In actual application, the hydrogen supply circuit of the fuel cell is usually a small circulation structure, which saves more hydrogen than the direct hydrogen discharge structure.

[0003] Before using a fuel cell system to generate electricity, it is often necessary to start up and purge the system to inject hydrogen into the hydrogen supply circuit to replace the nitrogen or oxygen in the hydrogen supply circuit to ensure that there is a sufficient concentration of hydrogen supplied. However, the start-up and purge duration in the related art is usually fixed, resulting in a serious waste of energy.

[0004] It should be noted that the information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the purpose of the present invention is to propose a fuel cell startup purge method, device, fuel cell system and medium, which can purge the fuel cell based on the target startup purge duration, ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the startup purge duration of the fuel cell, and reduce the energy consumption of the fuel cell.

[0006] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present invention provides a method for power-on purging of a fuel cell, the method comprising: responding to a start-up instruction of the fuel cell, obtaining the shutdown time of the fuel cell; determining a target power-on purging time according to the shutdown time; and powering on and purging the fuel cell based on the target power-on purging time.

[0007] According to the power-on purging method for a fuel cell in an embodiment of the present invention, when the fuel cell is started, the shutdown time of the fuel cell is obtained, and the corresponding target power-on purging time is determined according to different shutdown time periods, and then the fuel cell is powered on and purged based on the target power-on purging time. This ensures that the fuel cell has a sufficient hydrogen supply concentration, optimizes the power-on purging time of the fuel cell, and reduces the energy consumption of the fuel cell.

[0008] In some embodiments of the present invention, a target startup purge duration is determined based on the shutdown duration, including: determining a shutdown duration interval corresponding to the shutdown duration, wherein different shutdown duration intervals correspond to different startup purge durations; and determining the target startup purge duration based on the shutdown duration interval.

[0009] In some embodiments of the present invention, the target startup purge duration is positively correlated with the shutdown placement duration.

[0010] In some embodiments of the present invention, the power-on purge duration corresponding to any shutdown time interval is obtained by screening from the corresponding power-on purge time range based on relevant indicators of the fuel cell, wherein the power-on purge time range is obtained based on empirical data, and the relevant indicators include at least one of a voltage recovery index, a hydrogen concentration index, and an inlet and outlet pressure difference index.

[0011] In some embodiments of the present invention, the power-on purge duration corresponding to any shutdown placement time interval is screened in the following manner: at least one candidate power-on purge duration whose relevant indicators of the fuel cell meet preset conditions is screened from the power-on purge time range, wherein the preset conditions include at least one of a voltage recovery indicator being less than a voltage recovery indicator threshold, a hydrogen concentration indicator being within a hydrogen concentration range, and an inlet and outlet pressure difference indicator being within an inlet and outlet pressure difference range; and the power-on purge duration corresponding to any shutdown placement time interval is screened from at least one candidate power-on purge time.

[0012] In some embodiments of the present invention, when there are multiple candidate power-on purge durations and multiple related indicators, a power-on purge duration corresponding to any downtime placement time interval is selected from at least one candidate power-on purge duration, including: weighted processing of multiple related indicators corresponding to each candidate power-on purge duration in multiple candidate power-on purge durations; based on the weighted results, a power-on purge duration corresponding to any downtime placement time interval is selected from multiple candidate power-on purge times.

[0013] In some embodiments of the present invention, when the candidate power-on purge durations include multiple and the related indicators include one, a power-on purge duration corresponding to any downtime placement time interval is selected from at least one candidate power-on purge duration, including: sorting the related indicators corresponding to the multiple candidate power-on purge durations; based on the sorting results, selecting a power-on purge duration corresponding to any downtime placement time interval from the multiple candidate power-on purge times.

[0014] To achieve the above-mentioned purpose, a second aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the startup purging method of a fuel cell of any of the above-mentioned embodiments.

[0015] According to the computer-readable storage medium of an embodiment of the present invention, by obtaining the shutdown time of the fuel cell when the fuel cell sends a startup signal, and determining the corresponding target startup purge time according to different shutdown time, and then starting up and purging the fuel cell based on the target startup purge time, it is possible to ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the startup purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0016] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention provides a fuel cell system, including: a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the power-on purge method of the fuel cell of any of the above-mentioned embodiments is implemented.

[0017] According to the fuel cell system of an embodiment of the present invention, by obtaining the shutdown time of the fuel cell when the fuel cell is started, and determining the corresponding target startup purge time according to different shutdown time, and then starting up and purging the fuel cell based on the target startup purge time, it can ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the startup purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0018] To achieve the above-mentioned purpose, the fourth aspect of the present invention provides a power-on purge device for a fuel cell, which includes: an acquisition module for responding to a start-up instruction of the fuel cell and acquiring the shutdown time of the fuel cell; a determination module for determining a target power-on purge time according to the shutdown time; and a control module for performing power-on purge on the fuel cell based on the target power-on purge time.

[0019] According to the power-on purge device of the fuel cell according to the embodiment of the present invention, the acquisition module responds to the start-up instruction of the fuel cell, obtains the shutdown time of the fuel cell, and determines the target power-on purge time according to the shutdown time through the determination module, and the control module performs power-on purge on the fuel cell based on the target power-on purge time. In this way, it can ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the power-on purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1is a structural block diagram of a fuel cell system according to an embodiment of the present invention.

[0023] Figure 2 The figure is a flow chart of a method for starting up and purging a fuel cell according to an embodiment of the present invention.

[0024] Figure 3 is a structural block diagram of a fuel cell system according to another embodiment of the present invention.

[0025] Figure 4 It is a structural block diagram of a startup purge device for a fuel cell according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] It should be noted that fuel cells mainly convert chemical energy into electrical energy through redox reactions between hydrogen fuel and oxygen in the electrolyte layer, and provide power to the fuel cell system through the flow of electrons in an external circuit. Figure 1 is a structural block diagram of a fuel cell system according to an embodiment of the present invention. Figure 1 As shown, the coolant pipeline 101 of the fuel cell system 100 is composed of an overflow kettle, a radiator, a humidifier, a water pump and several temperature sensors T, which are used to cool the fuel cell and maintain a stable operating temperature of the fuel cell; the hydrogen pipeline 102 of the fuel cell system 100 is composed of a drain valve, a gas-liquid separator, an exhaust valve, an oxygen circulation pump, a hydrogen supply valve, a hydrogen heat exchanger, a hydrogen storage system and several temperature sensors T and several pressure sensors P, which are used to supply hydrogen fuel to the fuel cell and control the hydrogen flow and detect leakage; the air pipeline 103 of the fuel cell system 100 is composed of an air filter, an air flow meter, an air compressor, several bypass valves, an intercooler, several stop valves, a humidification valve, a back pressure valve and several temperature sensors T and several pressure sensors P, which are used to supply oxygen to the fuel cell, control oxygen and temperature and humidity, etc. In addition, the fuel cell system also includes a stack 104, which includes a hydrogen supply circuit and an air supply circuit. The hydrogen in the hydrogen supply circuit is provided by the hydrogen pipeline 102, and the air in the air supply circuit is provided by the air pipeline 103.

[0028] Specifically, the scenario when the fuel cell system is shut down is divided into an initial shutdown stage and a shutdown placement stage, wherein the shutdown stage is: when the fuel cell system has just completed shutdown, the gas remaining in the hydrogen supply circuit inside the stack 104 can be considered to be composed only of hydrogen, and the gas remaining in the air supply circuit can be considered to be composed of a large amount of nitrogen and a small amount of oxygen.

[0029] Since water will be generated inside the stack 104 during the operation of the fuel cell system, excess hydrogen is needed to blow away the water inside the stack 104. However, the excess hydrogen will not be completely consumed, so the excess hydrogen is recycled through the small circulation structure of the hydrogen supply loop to reduce fuel consumption. At the same time, since there is a small circulation structure in the hydrogen supply loop, the small circulation structure is isolated from the external environment, so that the hydrogen supply loop does not flow with the external environment except for the slow leakage of hydrogen. And since there are two stop valves between the air pipeline of the fuel cell and the stack 104, the air supply loop inside the stack 104 will be isolated from the external environment after the stop valve is opened, so that the air supply loop does not flow with the external environment except for the slow leakage of nitrogen and oxygen.

[0030] The shutdown stage is: although the small circulation structure in the hydrogen supply loop of the fuel cell system isolates the hydrogen supply loop from the external environment, and the shut-off valve between the stack 104 and the air pipeline of the fuel cell isolates the air supply loop from the external environment, inside the fuel cell, the gas can pass through the proton exchange membrane of the fuel cell. In a short period of time, the hydrogen content in the hydrogen supply loop inside the fuel cell system will gradually decrease, and the nitrogen content will gradually increase. And because the gas between the cathode and anode of the stack 104 is in a slow leakage state, as time goes by, the leakage of the stack 104 will worsen, so that the air in the external environment will gradually fill into the hydrogen supply loop, until the gas remaining in the hydrogen supply loop inside the fuel cell system is finally composed of air.

[0031] That is to say, after the fuel cell is shut down, as the shutdown time increases, the hydrogen content of its hydrogen supply circuit will gradually decrease until the circuit is filled with air, and the air content in the air supply circuit will gradually increase. Before the fuel cell is restarted, the hydrogen content of the hydrogen supply circuit is very small, or even may not contain hydrogen, which affects the normal operation of the fuel cell system. Therefore, before the fuel cell is turned on again to generate electricity through the fuel cell system, hydrogen is injected into the hydrogen supply circuit through power-on purge, thereby blowing out the air remaining in the hydrogen supply circuit to ensure that the fuel cell system can operate normally and provide sufficient hydrogen supply to generate the required electricity.

[0032] Based on this, an embodiment of the present invention provides a fuel cell power-on purge method, device, fuel cell system and medium, which performs power-on purge on the fuel cell based on a target power-on purge duration, thereby ensuring that the fuel cell has a sufficient hydrogen supply concentration, optimizing the power-on purge duration of the fuel cell, and reducing the energy consumption of the fuel cell.

[0033] The following describes in detail the fuel cell startup purge method, device, fuel cell system and medium according to the embodiments of the present invention in conjunction with the accompanying drawings.

[0034] Figure 2 The figure is a flow chart of a method for starting up and purging a fuel cell according to an embodiment of the present invention.

[0035] like Figure 2 As shown, the startup purging method of the fuel cell may include:

[0036] S11: Responding to a start-up instruction of the fuel cell, obtaining the shutdown time of the fuel cell.

[0037] Specifically, after the fuel cell system is shut down, as the shutdown time increases, the hydrogen content in its hydrogen supply circuit will gradually decrease until it disappears, and at the same time, the air content in the air supply circuit will gradually increase. If the hydrogen supply circuit of the fuel cell is not purged according to the gas changes inside the fuel cell before the fuel cell is started, a problem exists where the startup purge time is too short or too long. Therefore, when the fuel cell system receives a startup command for the fuel cell, the shutdown time of the fuel cell will be obtained according to the startup command to determine the hydrogen content in the hydrogen supply circuit of the fuel cell and the air content in the air supply circuit according to the shutdown time.

[0038] S13: Determine the target startup purge duration according to the shutdown duration.

[0039] The target purge time is a pre-set startup purge time, which is set based on the shutdown time. It can be understood that the longer the shutdown time is, the less hydrogen content in the hydrogen supply circuit is, and the more air content in the air supply circuit is. Before the fuel cell is turned on again to generate electricity, the longer the startup purge time is required, that is, the target startup purge time is positively correlated with the shutdown time. The corresponding target startup purge time is determined according to different shutdown times to achieve differentiation and optimization of the startup purge time.

[0040] S15: Powering on and purging the fuel cell based on the target power-on and purge duration.

[0041] That is to say, after the corresponding target startup purge duration is determined according to the shutdown time, the fuel cell is started up and purged based on the target startup purge duration. During the startup purge process, the hydrogen supply valve continuously supplies hydrogen to the hydrogen supply circuit and establishes pressure on the hydrogen side. The hydrogen circulation pump mixes the gas components of the hydrogen supply circuit evenly, and then opens the exhaust valve. By utilizing the principle that the pressure difference of the hydrogen supply circuit is higher than that of the environment, the mixed gas is discharged into the environment to replace the nitrogen, oxygen or other gases in the hydrogen supply circuit. In this way, the startup purge of the fuel cell can be completed efficiently and a sufficient hydrogen concentration supply is guaranteed.

[0042] For example: when the shutdown time is 4 hours, it is considered that there is still a large amount of hydrogen in the hydrogen supply circuit, and there is still a large amount of nitrogen and a small amount of oxygen (i.e., the components of air) in the air supply circuit. If the fuel cell is turned on again to generate electricity, a shorter target startup purge time such as 1S is set to complete the purge work before the fuel cell is turned on, or the fuel cell is turned on directly; when the shutdown time is 24 hours, it is considered that there is a small amount of hydrogen and a large amount of nitrogen in the hydrogen supply circuit, and there is also a small amount of hydrogen and a large amount of nitrogen in the air supply circuit. If the fuel cell is turned on again to generate electricity, a target startup purge time longer than the shutdown time of 4 hours is set, such as 5S, to complete the purge work before the fuel cell is turned on.

[0043] In the above embodiment, by obtaining the shutdown time of the fuel cell when the fuel cell is started, and determining the corresponding target startup purge time according to different shutdown time, and then starting up and purging the fuel cell based on the target startup purge time, it can be ensured that the fuel cell has a sufficient hydrogen supply concentration, and the startup purge time of the fuel cell is optimized, thereby reducing the energy consumption of the fuel cell.

[0044] In some embodiments, a target startup purge duration is determined based on the shutdown duration, including: determining a shutdown duration interval corresponding to the shutdown duration, wherein different shutdown duration intervals correspond to different startup purge durations; and determining a target startup purge duration based on the shutdown duration interval.

[0045] Specifically, because the hydrogen content, nitrogen content and oxygen content in the hydrogen supply circuit of the fuel cell are similar within a certain range of shutdown time, the hydrogen content, nitrogen content and oxygen content in the air supply circuit are also similar, the shutdown time with similar gas change conditions is divided into the same shutdown time interval, which is also convenient for determining the corresponding target startup purge time.

[0046] For example, the changes of the hydrogen content in the hydrogen supply loop and the air content in the air supply loop with the shutdown time are measured by experiments, as shown in Table 1:

[0047] Table 1

[0048]

[0049] Among them, the range of shutdown time in the ultra-short shutdown interval is [0, 2h), the range of shutdown time in the short shutdown interval is [2h, 8h), the range of shutdown time in the medium-short shutdown interval is [8h, 24h), the range of shutdown time in the long shutdown interval is [24, 168h], and the shutdown time in the ultra-long shutdown interval is greater than 168h (7 days).

[0050] When the fuel cell completes the shutdown operation, a large amount of hydrogen still remains in its hydrogen supply circuit, and a large amount of nitrogen and a small amount of oxygen still remain in the air supply circuit. As the shutdown time increases, when the shutdown time is in the ultra-short shutdown interval, since the nitrogen in the air supply circuit will penetrate into the hydrogen supply circuit from the cathode side of the stack 104, a small amount of nitrogen and a large amount of hydrogen remain in the hydrogen supply circuit in the ultra-short shutdown interval. At the same time, since the hydrogen in the hydrogen supply circuit will also penetrate into the air supply circuit from the cathode side of the stack 104, the small amount of oxygen remaining in the air supply circuit will chemically react with the penetrated hydrogen, so that only a large amount of nitrogen remains in the air supply circuit.

[0051] When the shutdown time is in a short shutdown interval, more and more nitrogen in the air supply circuit will gradually penetrate from the cathode side of the fuel cell stack 104 into the hydrogen supply circuit, so that there are a large amount of nitrogen and a large amount of hydrogen in the hydrogen supply circuit. At the same time, more and more hydrogen in the hydrogen supply circuit will gradually penetrate from the cathode side of the fuel cell stack 104 into the air supply circuit, so that a large amount of hydrogen and a large amount of nitrogen remain in the air supply circuit.

[0052] When the shutdown time is in the medium or short shutdown range, due to the slow leakage of the fuel cell stack 104, part of the hydrogen in the hydrogen supply circuit will chemically react with the oxygen in the infiltrated air, causing the hydrogen content in the hydrogen supply circuit to decrease. At the same time, part of the hydrogen in the air supply circuit will also chemically react with the oxygen in the infiltrated air again, causing the hydrogen content in the air supply circuit to gradually decrease.

[0053] When the shutdown time is in the long shutdown range, as the air gradually penetrates into the hydrogen supply circuit and the air supply circuit, there will be a large amount of nitrogen and a small amount of oxygen in the hydrogen supply circuit and the air supply circuit. Then, as the shutdown time continues to increase, the hydrogen supply circuit and the air supply circuit will gradually be filled with air.

[0054] In this embodiment, the power-on purge duration corresponding to any shutdown time interval is obtained by screening from the corresponding power-on purge time range based on relevant indicators of the fuel cell, wherein the power-on purge time range is obtained based on empirical data, and the relevant indicators include at least one of a voltage recovery index, a hydrogen concentration index, and an inlet and outlet pressure difference index.

[0055] Specifically, the power-on purge time ranges corresponding to different shutdown time intervals are set based on empirical data obtained by staff during the use of the fuel cell. It can be understood that according to the experimentally measured changes in the hydrogen content in the hydrogen supply circuit and the air content in the air supply circuit with the shutdown time in Table 1, the staff can set the power-on purge time ranges corresponding to different shutdown time intervals based on empirical data such as the changes in gas content during the use of the fuel cell and historical purge time. The longer the shutdown time in the shutdown time interval, the longer the power-on purge time in the corresponding power-on purge time range.

[0056] The voltage recovery index refers to the voltage value of the stack 104 in the fuel cell after it returns to stability under load changes or other disturbance conditions. The hydrogen concentration index refers to the hydrogen concentration in the exhaust gas generated when the fuel cell system is running. The inlet and outlet pressure difference index refers to the pressure difference between the anode inlet and the anode outlet of the stack 104 in the fuel cell. Based on at least one of the voltage recovery index, hydrogen concentration index and inlet and outlet pressure difference index of the fuel cell, the stability and performance of the fuel cell can be monitored, so as to ensure sufficient hydrogen supply to the fuel cell and select a power-on purge time that is beneficial to the stability and performance of the fuel cell from the corresponding power-on purge time range.

[0057] That is to say, the startup purge time corresponding to any shutdown time interval may be a time range. For the case where the startup purge time is within a range, the appropriate startup purge time can be screened from the corresponding startup purge time range based on at least one of the voltage recovery index, hydrogen concentration index and inlet and outlet pressure difference index.

[0058] In summary, by determining the shutdown time interval corresponding to the shutdown time, the gas changes in the hydrogen supply circuit and the air supply circuit corresponding to different shutdown time intervals can be determined, and the corresponding power-on purge time ranges are determined according to different shutdown time intervals, wherein the longer the shutdown time of the shutdown time interval, the longer the power-on purge time in the corresponding power-on purge time range, such as: the shutdown time range corresponding to the ultra-short shutdown time interval is [0S, 1S], the shutdown time range corresponding to the short shutdown time interval is [1S, 2S], the shutdown time range corresponding to the medium and short shutdown time interval is [2S, 3S], the shutdown time corresponding to the long shutdown time interval is [4S, 7S], and the shutdown time corresponding to the ultra-long shutdown time interval is [8S, 10S]. Therefore, based on the relevant indicators of the fuel cell, the power-on purge time corresponding to any shutdown time interval is screened from the corresponding power-on purge time range.

[0059] In this way, the fuel cell can be purged flexibly and efficiently, avoiding energy waste due to long startup and purge time.

[0060] In some embodiments, the power-on purge duration corresponding to any shutdown placement time interval is screened in the following manner: at least one candidate power-on purge duration whose relevant indicators of the fuel cell meet preset conditions is screened from the power-on purge time range, wherein the preset conditions include at least one of a voltage recovery indicator being less than a voltage recovery indicator threshold, a hydrogen concentration indicator being within a hydrogen concentration range, and an inlet and outlet pressure difference indicator being within an inlet and outlet pressure difference range; and the power-on purge duration corresponding to any shutdown placement time interval is screened from at least one candidate power-on purge duration.

[0061] Exemplarily, the candidate power-on purge durations are screened by the voltage recovery index, the voltage recovery index threshold may be 30mv, the power-on purge duration range determined according to the ultra-long shutdown interval is [8S, 10S], and the power-on purge duration is usually an integer, that is, the power-on purge durations in the power-on purge duration range are 8S, 9S, and 10S, wherein the voltage recovery index V1 corresponding to 8S is 40mv, the voltage recovery index V2 corresponding to 9S is 33mv, and the voltage recovery index V3 corresponding to 10S is 27mv. According to the preset condition that the voltage recovery index is less than 30mv, the power-on purge durations in the above power-on purge duration range are screened to obtain 10S as the candidate power-on purge duration, and therefore 10S is determined to be the power-on purge duration corresponding to the ultra-long shutdown interval. If there are multiple candidate power-on purge durations, it is necessary to further screen out the power-on purge durations corresponding to any shutdown placement duration interval.

[0062] In this way, by screening the startup purge duration according to relevant indicators and preset conditions, a more reasonable startup purge duration can be selected, thereby reducing energy consumption (such as hydrogen consumption) and improving the startup purge efficiency.

[0063] It should be noted that since the purpose of the power-on purge of the fuel cell is to replace the gas in the anode cavity with hydrogen through power-on purge before the fuel cell is turned on again to generate electricity through the fuel cell system, so as to ensure the normal operation of the fuel cell system, the gas composition in the fuel cell is not fixed before the power-on purge, and different power-on purge times are required to inject hydrogen into the hydrogen supply circuit. When all the gas in the anode cavity is replaced with hydrogen, the gas composition in the anode cavity will be consistent. At this time, the physical properties (such as pressure, temperature, etc.) and electrochemical properties (such as potential, reaction rate, etc.) of the anode will tend to be consistent. Therefore, the candidate power-on purge time can be determined from the power-on purge time range corresponding to different shutdown time intervals through the above-mentioned relevant indicators and preset conditions.

[0064] In some embodiments, when the candidate power-on purge durations include multiple and the related indicators include multiple, a power-on purge duration corresponding to any downtime placement time interval is selected from at least one candidate power-on purge duration, including: weighted processing of multiple related indicators corresponding to each candidate power-on purge duration in the multiple candidate power-on purge durations; based on the weighted results, a power-on purge duration corresponding to any downtime placement time interval is selected from the multiple candidate power-on purge times.

[0065] Exemplarily, when selecting multiple candidate power-on purge time lengths from the power-on purge time range according to relevant indicators, the relevant indicators include a voltage recovery index, a hydrogen concentration index, and an inlet and outlet pressure difference index, wherein the voltage recovery index threshold may be 30 mv, and the hydrogen concentration range may be [10000 ppm, 30000 ppm], wherein ppm [part per million] is mainly used as a unit of expression for gas concentration in gas detection, and the inlet and outlet pressure difference range may be [1 kPa, 2 kPa].

[0066] The startup purge duration range determined according to the ultra-long shutdown interval is [8S, 11S], and the startup purge durations in the startup purge duration range are determined to be 8S, 9S, 10S and 11S, among which, 8S corresponds to a voltage recovery index V1=40mv, a hydrogen concentration index C1=45000ppm and an inlet and outlet pressure difference index P1=3kpa; 9S corresponds to a voltage recovery index V2=32mv, a hydrogen concentration index C2=33000ppm and an inlet and outlet pressure difference index P2=2.3kpa; 10S corresponds to a voltage recovery index V3=27mv, a hydrogen concentration index C3=23000ppm and an inlet and outlet pressure difference index P3=1.7kpa; 11S corresponds to a voltage recovery index V4=20mv, a hydrogen concentration index C4=18000ppm and an inlet and outlet pressure difference index P1=1.2kpa.

[0067] Furthermore, according to the preset conditions that the voltage recovery index is less than 30mv, the hydrogen concentration index is greater than 10000ppm and less than 30000ppm, and the inlet and outlet pressure difference index is greater than 1kpa and less than 2kpa, the power-on purge duration within the above-mentioned power-on purge duration range is screened to obtain 10S and 11S as candidate power-on purge durations. Since there are multiple candidate power-on purge durations within the power-on purge duration range, the relevant indicators corresponding to each candidate power-on duration are weighted.

[0068] That is, corresponding weights are assigned to the voltage recovery index, hydrogen concentration index and import and export pressure difference index corresponding to the candidate startup time of 10S, such as: the weight corresponding to the voltage recovery index is 0.5, the weight corresponding to the hydrogen concentration index is 0.3, and the weight corresponding to the import and export pressure difference index is 0.2. The weighted result of the candidate startup time of 10S is calculated according to the assigned weights: voltage recovery index V3'=13.5mv, hydrogen concentration index C3'=6900ppm and P3=0.34kpa. Similarly, the voltage recovery index, hydrogen concentration index and import and export pressure difference index corresponding to the candidate startup time of 11S are also assigned the same weights and the weighted results are calculated as: voltage recovery index V4'=10mv, hydrogen concentration index C3'=5400ppm and P3=0.24kpa.

[0069] Further, according to the weighted results corresponding to the candidate startup duration of 10S and the candidate startup duration of 11S, the candidate startup duration whose relevant indicators are closer to the preset conditions is selected, that is, the startup purge duration corresponding to the ultra-long shutdown interval is determined to be 10S. Among them, the weights assigned to each relevant indicator can be adjusted according to actual usage needs and are not limited here.

[0070] In this way, by weighting the relevant indicators, a more reasonable startup purge duration can be selected, thereby reducing energy consumption (such as hydrogen consumption) and improving startup purge efficiency.

[0071] In some embodiments, when the candidate power-on purge durations include multiple and the related indicators include one, a power-on purge duration corresponding to any downtime placement time interval is selected from at least one candidate power-on purge duration, including: sorting the related indicators corresponding to the multiple candidate power-on purge durations; based on the sorting results, a power-on purge duration corresponding to any downtime placement time interval is selected from the multiple candidate power-on purge times.

[0072] Exemplarily, when screening multiple candidate power-on purge durations from the power-on purge duration range according to relevant indicators, the relevant indicator is a hydrogen concentration indicator, and its range is [10000ppm, 30000ppm]. The power-on purge duration range determined according to the ultra-long shutdown interval is [8S, 11S]. It is determined that the power-on purge durations in the power-on purge duration range are 8S, 9S, 10S and 11S, among which 8S corresponds to a hydrogen concentration indicator C1=45000ppm; 9S corresponds to a hydrogen concentration indicator C2=28000ppm; 10S corresponds to a hydrogen concentration indicator C3=23000ppm; 11S corresponds to a hydrogen concentration indicator C4=18000ppm.

[0073] Furthermore, according to the preset condition that the hydrogen concentration index is greater than 10000ppm and less than 30000ppm, the power-on purge duration within the above-mentioned power-on purge duration range is screened to obtain 9S, 10S and 11S as candidate power-on purge durations. Since there are multiple candidate power-on purge durations within the power-on purge duration range, the hydrogen concentration indicators corresponding to the multiple candidate power-on durations are sorted.

[0074] That is, the hydrogen concentration indexes corresponding to the candidate startup durations of 9S, 10S and 11S are sorted in descending order, and the sorting results are 28000ppm, 23000ppm and 18000ppm. Generally, the candidate startup durations closer to the middle value of the hydrogen concentration range are more reasonable, so the candidate startup durations with hydrogen concentration indexes closer to the middle value of the hydrogen concentration range of 20000ppm can be selected, that is, the startup purge duration corresponding to the long shutdown interval is determined to be 10S. Among them, the basis for selecting the startup purge duration based on the sorting results can also be adjusted according to actual use needs, which is not limited here.

[0075] In this way, by sorting the relevant indicators, a more reasonable startup purge duration can be selected, thereby reducing energy consumption (such as hydrogen consumption) and improving startup purge efficiency.

[0076] It should be noted that the specific numerical values ​​mentioned above are only used as examples to illustrate the implementation of the present invention in detail, and should not be understood as limiting the present invention. In other examples or implementations or embodiments, other numerical values ​​can be selected according to the present invention, and are not specifically limited here.

[0077] Corresponding to the above embodiments, an embodiment of the present invention further provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the startup purging method of a fuel cell in any of the above embodiments is implemented.

[0078] According to the computer-readable storage medium of an embodiment of the present invention, by obtaining the shutdown time of the fuel cell when the fuel cell sends a startup signal, and determining the corresponding target startup purge time according to different shutdown time, and then starting up and purging the fuel cell based on the target startup purge time, it is possible to ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the startup purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0079] It should be noted that the above-mentioned explanation of the embodiments and beneficial effects of the fuel cell startup purge method is also applicable to the computer-readable storage medium of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0080] Corresponding to the above embodiment, an embodiment of the present invention further provides a fuel cell system.

[0081] Figure 3 is a structural block diagram of a fuel cell system according to an embodiment of the present invention. Figure 3 As shown, the fuel cell system 100 includes: a memory 105, a processor 107, and a program 109 stored in the memory 105 and executable on the processor 107. When the processor 107 executes the program 109, the startup purge method of the fuel cell according to any of the above embodiments is implemented.

[0082] According to the fuel cell system of an embodiment of the present invention, by obtaining the shutdown time of the fuel cell when the fuel cell is started, and determining the corresponding target startup purge time according to different shutdown time, and then starting up and purging the fuel cell based on the target startup purge time, it can ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the startup purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0083] It should be noted that the above-mentioned explanation of the embodiment and beneficial effects of the fuel cell startup purge method is also applicable to the fuel cell system 100 of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0084] Corresponding to the above-mentioned embodiment, an embodiment of the present invention further provides a startup purge device for a fuel cell.

[0085] Figure 4 FIG. 1 is a structural block diagram of a fuel cell startup purge device according to an embodiment of the present invention. Figure 4 As shown, the power-on purge device 300 of the fuel cell includes: an acquisition module 302, which is used to respond to the start-up instruction of the fuel cell and obtain the shutdown time of the fuel cell; a determination module 304, which is used to determine the target power-on purge time according to the shutdown time; and a control module 306, which is used to perform power-on purge on the fuel cell based on the target power-on purge time.

[0086] According to the power-on purge device of the fuel cell according to the embodiment of the present invention, the acquisition module responds to the start-up instruction of the fuel cell, obtains the shutdown time of the fuel cell, and determines the target power-on purge time according to the shutdown time through the determination module, and the control module performs power-on purge on the fuel cell based on the target power-on purge time. In this way, it can ensure that the fuel cell has a sufficient hydrogen supply concentration, optimize the power-on purge time of the fuel cell, and reduce the energy consumption of the fuel cell.

[0087] In some embodiments of the present invention, the determination module 304 is specifically used to: determine the shutdown placement time interval corresponding to the shutdown placement time, wherein different shutdown placement time intervals correspond to different startup purge time lengths; determine the target startup purge time length according to the shutdown placement time interval.

[0088] In some embodiments of the present invention, the target startup purge duration is positively correlated with the shutdown placement duration.

[0089] In some embodiments of the present invention, the power-on purge duration corresponding to any shutdown time interval is obtained by screening from the corresponding power-on purge time range based on relevant indicators of the fuel cell, wherein the relevant indicators include at least one of a voltage recovery indicator, a hydrogen concentration indicator, and an inlet and outlet pressure difference indicator.

[0090] In some embodiments of the present invention, the power-on purge duration corresponding to any shutdown placement time interval is obtained by screening through a screening module (not shown in the figure): at least one candidate power-on purge duration whose relevant indicators of the fuel cell meet preset conditions is screened out from the power-on purge time range, wherein the preset conditions include at least one of a voltage recovery indicator being less than a voltage recovery indicator threshold, a hydrogen concentration indicator being within a hydrogen concentration range, and an inlet and outlet pressure difference indicator being within an inlet and outlet pressure difference range; the power-on purge duration corresponding to any shutdown placement time interval is screened out from at least one candidate power-on purge duration.

[0091] In some embodiments of the present invention, when the candidate power-on purge durations include multiple and the related indicators include multiple, the screening module (not shown in the figure) is specifically used to: perform weighted processing on the multiple related indicators corresponding to each candidate power-on purge duration in the multiple candidate power-on purge durations; based on the weighted results, screen out the power-on purge duration corresponding to any shutdown placement time interval from the multiple candidate power-on purge times.

[0092] In some embodiments of the present invention, when the candidate power-on purge durations include multiple and the related indicators include one, the screening module (not shown in the figure) is specifically used to: sort the related indicators corresponding to the multiple candidate power-on purge durations; based on the sorting results, screen out the power-on purge duration corresponding to any shutdown placement time interval from the multiple candidate power-on purge times.

[0093] It should be noted that the above-mentioned explanation of the embodiment and beneficial effects of the fuel cell startup purge method is also applicable to the fuel cell startup purge device 300 of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0094] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0095] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that at least one of the features is included in the embodiment. In the description of the present invention, the meaning of the word "multiple" is at least two or two and above, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments. Relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0098] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, electronic device, and computer-readable storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fuel cell startup purging method, characterized in that: The method comprises: In response to a start-up instruction of the fuel cell, obtaining a shutdown time of the fuel cell; Determine the target startup purge duration according to the shutdown duration; The fuel cell is powered on and purged based on the target power-on and purge duration.

2. The method according to claim 1, characterized in that Determining the target startup purge duration according to the shutdown duration includes: Determine a shutdown time interval corresponding to the shutdown time, wherein different shutdown time intervals correspond to different startup purge time; The target startup purge duration is determined according to the shutdown placement time interval.

3. The method according to claim 1 or 2, characterized in that: The target startup purge duration is positively correlated with the shutdown placement duration.

4. The method according to claim 2, characterized in that: The power-on purge duration corresponding to any shutdown time interval is obtained by screening from the corresponding power-on purge time range based on relevant indicators of the fuel cell, wherein the power-on purge time range is obtained based on empirical data, and the relevant indicators include at least one of a voltage recovery index, a hydrogen concentration index and an inlet and outlet pressure difference index.

5. The method according to claim 4, characterized in that The startup purge duration corresponding to any shutdown time interval is obtained by screening in the following way: At least one candidate power-on purge duration whose related index of the fuel cell meets preset conditions is selected from the power-on purge duration range, wherein the preset conditions include at least one of the voltage recovery index being less than a voltage recovery index threshold, the hydrogen concentration index being within a hydrogen concentration range, and the inlet and outlet pressure difference index being within an inlet and outlet pressure difference index range; The power-on purge duration corresponding to any shutdown placement time interval is selected from at least one of the candidate power-on purge durations.

6. The method according to claim 5, characterized in that When the candidate power-on purge durations include multiple ones and the related indicators include multiple ones, selecting the power-on purge duration corresponding to the arbitrary shutdown placement time interval from at least one of the candidate power-on purge durations includes: Performing weighted processing on the multiple related indicators corresponding to each of the multiple candidate power-on purge durations; Based on the weighted result, the power-on purge duration corresponding to the arbitrary shutdown placement time interval is screened out from the plurality of candidate power-on purge times.

7. The method according to claim 5, characterized in that When the candidate power-on purge durations include multiple ones and the related indicator includes one, selecting the power-on purge duration corresponding to the arbitrary shutdown placement time interval from at least one of the candidate power-on purge durations includes: Sorting the relevant indicators corresponding to the plurality of candidate power-on purge durations; Based on the sorting result, the power-on purge duration corresponding to the arbitrary shutdown placement time interval is screened out from the plurality of candidate power-on purge times.

8. A computer-readable storage medium, characterized in that: A program is stored thereon, and when the program is executed by a processor, the startup purging method of a fuel cell according to any one of claims 1 to 7 is implemented.

9. A fuel cell system, characterized in that: include: A memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the startup purging method for a fuel cell according to any one of claims 1 to 7 is implemented.

10. A fuel cell startup purge device, characterized in that: The device comprises: An acquisition module, used for responding to a startup instruction of the fuel cell and acquiring a shutdown time of the fuel cell; A determination module, used to determine a target startup purge duration according to the shutdown placement duration; A control module is used to perform power-on purge on the fuel cell based on the target power-on purge duration.

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