CN116565261A - Start-stop control method for fuel cell system - Google Patents
Start-stop control method for fuel cell system Download PDFInfo
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- CN116565261A CN116565261A CN202210113782.4A CN202210113782A CN116565261A CN 116565261 A CN116565261 A CN 116565261A CN 202210113782 A CN202210113782 A CN 202210113782A CN 116565261 A CN116565261 A CN 116565261A
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- 239000000446 fuel Substances 0.000 title claims abstract description 367
- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000010926 purge Methods 0.000 claims abstract description 73
- 239000007800 oxidant agent Substances 0.000 claims abstract description 44
- 230000001590 oxidative effect Effects 0.000 claims abstract description 44
- 239000002737 fuel gas Substances 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims description 83
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 73
- 239000001257 hydrogen Substances 0.000 claims description 66
- 229910052739 hydrogen Inorganic materials 0.000 claims description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000007788 liquid Substances 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 13
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 44
- 229910052757 nitrogen Inorganic materials 0.000 description 21
- 238000001514 detection method Methods 0.000 description 18
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101100518501 Mus musculus Spp1 gene Proteins 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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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
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04302—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during start-up
-
- 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
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04303—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during shut-down
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04574—Current
-
- 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
- H01M8/04895—Current
-
- 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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- Life Sciences & Earth Sciences (AREA)
- 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 relates to the technical field of fuel cells, in particular to a start-stop control method of a fuel cell system. The application aims to solve the problem that load voltage fluctuation is caused by starting a fuel cell system after purging. For this purpose, the start-stop control method of the present application includes: after receiving a starting instruction, controlling a purging unit to purge the fuel cell unit; after the purging is finished, controlling the fuel supply unit and the oxidant supply unit to supply fuel gas and oxidant gas to the fuel cell unit respectively so that the fuel cell unit outputs a preset current; obtaining the output current of the fuel cell unit and calculating the fluctuation rate of the output current; judging the magnitude of the fluctuation rate and the fluctuation rate threshold value; when the fluctuation rate is smaller than the fluctuation rate threshold value, controlling the fuel cell unit to supply power for a load by using a preset current; the preset current is smaller than the required current of the load. The start-stop control method can ensure the stable operation of the load and avoid the fluctuation of the load voltage.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a start-stop control method of a fuel cell system.
Background
The fuel cell system generally includes a fuel cell unit, a fuel supply unit, an oxidant supply unit, a heat radiation unit, and the like, and the fuel supplied from the fuel supply unit and the oxidant supplied from the oxidant supply unit enter the fuel cell unit together to react, and output electric energy and heat energy to the outside. To ensure the operation performance of the fuel cell system and to extend the service life of the fuel cell system, a purge step is typically added to the fuel cell system during start-up and shut-down to drain the residual fuel and liquid water from the fuel supply passage.
Currently, inert gas such as nitrogen is generally used to purge the inside of the fuel cell unit, and after purging, the fuel supply unit and the oxidant supply unit are started immediately to supply fuel and oxidant to supply power to the load. However, nitrogen still remains in the fuel cell after the purging is started, and at this time, the fuel cell unit is started to supply power, so that voltage fluctuation of a load is easily caused, and the load is unstable in operation and even damaged.
Accordingly, there is a need in the art for a new start-stop control method for a fuel cell system that addresses the above-described problems.
Disclosure of Invention
In order to solve at least one of the above-mentioned problems in the prior art, that is, in order to solve the problem of load voltage fluctuation caused by starting up a fuel cell system after purging, the present application provides a start-stop control method of a fuel cell system including a fuel cell unit including a fuel inlet, a fuel outlet, an oxidant inlet, and an oxidant outlet, a fuel supply unit and a purge unit, both of which are in communication with the fuel inlet, an oxidant supply unit in communication with the oxidant inlet,
The start-stop control method comprises the following steps:
after receiving a starting instruction, controlling the purging unit to purge the fuel cell unit;
after purging is finished, controlling the fuel supply unit and the oxidant supply unit to supply fuel gas and oxidant gas to the fuel cell unit respectively so that the fuel cell unit outputs a preset current;
obtaining the output current of the fuel cell unit and calculating the fluctuation rate of the output current;
judging the magnitude of the fluctuation rate and the fluctuation rate threshold;
when the fluctuation rate is smaller than the fluctuation rate threshold value, controlling the fuel cell unit to supply power for a load by using the preset current;
the preset current is smaller than the required current of the load.
In a preferred technical solution of the above-mentioned start-stop control method of a fuel cell system, after the step of controlling the fuel cell unit to supply the load with the preset current, the start-stop control method further includes:
acquiring the reaction temperature and the reaction humidity of the fuel cell unit;
judging the magnitudes of the reaction temperature and the lower temperature threshold value and the magnitudes of the reaction humidity and the lower humidity threshold value;
If the reaction temperature is less than the lower temperature threshold and/or the reaction humidity is less than the lower humidity threshold, controlling the output current of the fuel cell unit to increase until the output current reaches the required current;
and if the reaction temperature is greater than or equal to the lower temperature threshold and the reaction humidity is greater than or equal to the lower humidity threshold, controlling the output current of the fuel cell unit to be increased to the required current, and controlling the output voltage of the fuel cell unit to be increased to the required voltage of the load.
In a preferred embodiment of the above-described start-stop control method for a fuel cell system, the fuel cell system further includes a heat radiating unit for cooling the fuel cell unit,
the start-stop control method further comprises the following steps:
after purging is finished, obtaining the reaction temperature of the fuel cell unit;
judging the reaction temperature and the upper temperature threshold value;
and when the reaction temperature is greater than or equal to the upper temperature threshold, controlling the heat dissipation unit to start running.
In a preferred embodiment of the above start-stop control method for a fuel cell system, the fuel cell unit is configured with a hydrogen ion detection module and a liquid water detection module, and the start-stop control method further includes:
After receiving a starting signal, detecting whether the fuel cell unit contains residual hydrogen and liquid water;
and if the fuel cell unit contains neither residual hydrogen nor liquid water, controlling the purging unit to purge the fuel cell unit.
In a preferred technical solution of the above start-stop control method of a fuel cell system, the start-stop control method further includes:
after receiving the starting signal, judging whether a supercharging device of the oxidant supply unit is connected or not;
and if the supercharging device is connected, controlling the purging unit to purge the fuel cell unit.
In a preferred technical solution of the start-stop control method of the fuel cell system, the fuel cell system further includes an electricity storage unit, the electricity storage unit is connected with the fuel cell unit, and the start-stop control method further includes:
and when the fluctuation rate is greater than or equal to the fluctuation rate threshold value, controlling the electricity storage unit to store electricity.
In a preferred technical solution of the above start-stop control method of a fuel cell system, the start-stop control method further includes:
when a shutdown instruction is received, controlling the oxidant supply unit to stop the supply of the oxidant gas;
After stopping the supply of the oxidizing gas, controlling the fuel supply unit to decrease the supply amount of the fuel gas, and controlling the output current of the fuel cell unit to decrease;
acquiring an output voltage of the fuel cell unit;
judging the output voltage and a preset voltage threshold value;
if the output voltage is greater than or equal to the preset voltage threshold value, controlling the fuel supply unit to continuously reduce the fuel gas supply amount;
and if the output voltage is smaller than the preset voltage threshold value, controlling the fuel supply unit to stop the supply of the fuel gas.
In a preferred embodiment of the above start-stop control method of a fuel cell system, after the step of "controlling the fuel supply unit to stop the supply of the fuel gas", the start-stop control method further includes:
controlling the purging unit to purge the fuel cell unit;
and after the purging is finished, controlling the fuel cell unit to stop supplying power to the load.
In a preferred technical solution of the above start-stop control method of a fuel cell system, the start-stop control method further includes:
acquiring a reaction temperature of the fuel cell unit while or after controlling the fuel supply unit to stop the supply of the fuel gas;
Judging the reaction temperature and the stop temperature threshold value;
and if the reaction temperature is smaller than the stop temperature threshold value, controlling the heat dissipation unit to stop running.
In a preferred embodiment of the above start-stop control method of a fuel cell system, after the step of controlling the fuel cell unit to stop supplying power to a load, the start-stop control method further includes:
detecting whether the fuel cell unit contains residual hydrogen and liquid water;
if the fuel cell unit contains neither residual hydrogen nor liquid water, the fuel cell system is controlled to stop.
The fuel cell unit is controlled to supply power to the load when the fluctuation rate of the output current is smaller than the fluctuation rate threshold value, and the start-stop control method can ensure the stable operation of the load and avoid load voltage fluctuation. By using the preset current smaller than the load demand current as the load power supply, the load can be operated with small current after being started, and the ideal operation environment of the fuel cell unit is constructed by using the heat and the liquid water generated by the fuel cell unit in the small current operation process, so that the operation performance of the fuel cell is ensured.
Further, after the small-current operation, the reaction temperature and the reaction humidity of the fuel cell unit are judged, and the output current of the fuel cell unit is improved based on the judgment result, so that the inside of the fuel cell unit can quickly reach an ideal operation environment, and the quick start of the fuel cell unit is completed.
Further, by controlling the heat dissipation unit to start to operate according to the reaction temperature of the fuel cell unit after the purging is finished, the reaction temperature inside the fuel cell unit can be ensured to be balanced, and the conditions of local overheating and the like can not occur.
Further, by judging whether residual hydrogen and liquid water exist inside the fuel cell unit before starting purging, the state of the fuel cell unit after the previous shutdown can be effectively monitored. By judging whether the pressurizing device of the oxidant supply unit is connected before purging, the starting process after purging can be ensured to be carried out stably.
Further, when the fluctuation rate of the output current is greater than or equal to the fluctuation rate threshold, the electric energy generated by the fuel cell unit is stored in the electric storage unit, so that low-efficiency energy storage can be realized, and the overall energy utilization rate is improved.
Further, by stopping the supply of the oxidizer supply unit first and then reducing the supply amount of the fuel supply unit when the stop instruction is received, the occurrence of the electrode corrosion caused by stopping the supply of the fuel first can be avoided. By reducing the output current of the fuel cell unit while reducing the fuel supply amount, the remaining fuel can be efficiently consumed.
Further, by purging the fuel cell unit after the fuel supply unit is controlled to stop the supply of the fuel gas, no residual gas in the fuel cell unit after the purging is completed can be ensured, and the stability of the system operation can be ensured.
Further, by controlling the heat radiating unit to stop operation when the reaction temperature of the fuel cell unit is less than the temperature lower limit threshold value while or after stopping the supply of the fuel gas, it is possible to ensure that the internal temperature of the fuel cell is stable.
Further, whether residual hydrogen and liquid water exist in the fuel cell unit or not is judged after the fuel cell unit stops supplying power, so that the fuel cell unit can be effectively monitored before the power is stopped, and no hydrogen and liquid water remain in the fuel cell unit after purging.
Drawings
The start-stop control method of the fuel cell system of the present application is described below with reference to the accompanying drawings. In the accompanying drawings:
FIG. 1 is a system diagram of a fuel cell system of the present application;
FIG. 2 is a flow chart of a start-stop control method of the fuel cell system of the present application;
fig. 3 is a logic diagram of a start-up procedure of the fuel cell system of the present application;
fig. 4 is a logic diagram of a shutdown process of the fuel cell system of the present application.
List of reference numerals
1. A fuel cell unit; 21. a flow control valve; 22. a return valve; 23. a pressure regulating valve; 24. a hydrogen humidifier; 25. a hydrogen circulation pump; 31. a filter; 32. a supercharging device; 33. an air humidifier; 41. a nitrogen on-off valve; 51. a water tank; 52. a heat sink; 53. a cooling circulation pump; 54. a three-way control valve; 61. a first DC-DC converter; 62. a DC-AC converter; 63. a second DC-DC converter; 64. and a storage battery.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the following details of the method of the present application are described below, those skilled in the art may combine, split and exchange the following steps without departing from the basic principles of the present application, and the technical solution thus modified does not change the basic concepts of the present application, and therefore falls within the scope of protection of the present application.
Referring first to fig. 1, a brief description will be given of a fuel cell system of the present application. Fig. 1 is a system diagram of a fuel cell system according to the present application.
As shown in fig. 1, the fuel cell system includes a fuel cell unit 1, a fuel supply unit, an oxidant supply unit, a purge unit, an electricity storage unit, and a heat radiation unit (none of which are shown in the drawings except the fuel cell unit 1). The fuel cell unit 1 includes a fuel inlet, a fuel outlet, an oxidant inlet, an oxidant outlet, a heat dissipation inlet, and a heat dissipation outlet.
The fuel supply unit comprises a flow control valve 21, a reflux valve 22, a pressure regulating valve 23, a hydrogen humidifier 24, a hydrogen circulation pump 25 and the like, hydrogen is taken as fuel, after the flow, the pressure and the humidity of the hydrogen are regulated by the flow control valve 21, the pressure regulating valve 23 and the hydrogen humidifier 24, the hydrogen enters the fuel cell unit 1 through a fuel inlet to participate in the reaction, and the residual hydrogen after the reaction is discharged through a fuel outlet and returns to the outlet of the flow control valve 21 after passing through the hydrogen circulation pump 25 and the fuel reflux valve 22 to be converged with the supplied hydrogen to continue to participate in the fuel circulation.
The oxidant supply unit includes a filter 31, a pressurizing device 32, an air humidifier 33, and the like, and air as the oxidant is filtered, flow-regulated, and humidity-regulated by the filter 31, the pressurizing device 32, and the air humidifier 33, and then enters the inside of the fuel cell through the oxidant inlet to participate in the reaction, and the air remaining after the reaction is discharged through the oxidant outlet. The supercharging device 32 is an air compressor in the present application, but may be a blower in other embodiments.
The purge unit includes a nitrogen on-off valve 41, the gas used for the fuel cell purge is typically an inert gas, nitrogen is selected in this application, the inlet of the nitrogen on-off valve 41 is in communication with the nitrogen source, and the outlet is in communication with the fuel inlet. During purging, nitrogen enters the fuel cell unit 1 through the fuel inlet, takes away residual hydrogen and liquid water in the fuel cell unit 1, and is discharged through the fuel outlet.
The heat radiation unit includes a water tank 51, a radiator 52, a cooling circulation pump 53 and a three-way control valve 54, and an outlet of the water tank 51 is communicated with an inlet of the cooling circulation pump 53 for supplementing water to the pipeline. The heat radiation outlet of the fuel cell unit 1 is communicated with the inlet of the cooling circulation pump 53, the outlet of the cooling circulation pump 53 is simultaneously communicated with the inlet of the radiator 52 and the first interface of the three-way control valve 54, the outlet of the radiator 52 is communicated with the second interface of the three-way control valve 54, and the third interface of the three-way control valve 54 is communicated with the heat radiation inlet of the fuel cell unit 1. By switching the three-way control valve 54, communication of different circuits can be achieved, specifically, if the first port of the three-way control valve 54 is communicated with the third port when the cooling circulation pump 53 is started, circulation (hereinafter referred to as a circulation branch) between the cooling circulation pump 53 and the fuel cell unit 1 can be achieved, at which time only the cooling water circulates. When the cooling circulation pump 53 is started, if the second port of the three-way control valve 54 communicates with the third port and the radiator 52 is started to operate, circulation between the radiator 52 and the fuel cell unit 1 (hereinafter referred to as a radiator 52 branch) can be achieved, and at this time, the fuel cell unit 1 is cooled by the radiator 52.
The electricity storage unit is typically a storage battery 64, and the electric energy generated by the fuel cell unit 1 is converted by a conversion circuit such as the first DC-DC converter 61 and the second DC-DC converter 63, and then stored in the electricity storage unit. The power storage unit is also connected to the load through a battery converter (not shown in the figure) to convert the stored electric energy and then transmit the converted electric energy to the load to supply power to the load.
The electric power generated by the fuel cell unit 1 is connected to a load through a first DC-DC converter 61 and a DC-AC converter 62 to supply the load with the electric power generated by the fuel cell unit 1.
Of course, the specific arrangement of the fuel cell system is merely for illustrating the principles of the present application, and is not intended to limit the scope of protection of the present application, and a person skilled in the art may adjust the above system without departing from the principles of the present application, so long as the following start-stop control method can be implemented. For example, the above-described devices may be increased or decreased by a person skilled in the art, and the positions thereof may be adjusted.
Next, referring to fig. 2, a start-stop control method of the fuel cell system of the present application will be described. Fig. 2 is a flowchart of a start-stop control method of the fuel cell system of the present application.
As shown in fig. 2, in order to solve the problem of load voltage fluctuation caused by starting the fuel cell system after purging, the start-stop control method includes:
and S101, after receiving a starting instruction, controlling the purging unit to purge the fuel cell unit. For example, after the fuel cell system receives a start command, the nitrogen on-off valve is first controlled to open, and hydrogen and air are not supplied. At this time, nitrogen enters the fuel cell unit through the fuel inlet, the inside of the fuel cell unit is purged, for example, for 20 seconds, and the purged nitrogen is discharged through the fuel outlet.
Of course, the purge time varies from fuel cell system to fuel cell system and from nitrogen supply to nitrogen supply, and is only illustrative and not intended to limit the scope of the present application.
And S103, after the purging is finished, controlling the fuel supply unit and the oxidant supply unit to supply fuel gas and oxidant gas to the fuel cell unit respectively so that the fuel cell unit outputs preset current. For example, the preset current is smaller than the required current of the load, and after the purging is finished, the flow control valve and the pressure regulating valve are controlled to be opened to supply hydrogen to the fuel cell unit. After the hydrogen gas was supplied for 5 seconds, the nitrogen gas remaining in the fuel cell unit was basically discharged from the fuel outlet, at this time, the hydrogen circulation pump and the air compressor were turned on, air was supplied into the fuel cell unit, and the remaining hydrogen gas after the reaction was sent to the return valve by the hydrogen circulation pump to participate in the circulation again. On the premise of simultaneously supplying hydrogen and air to the fuel cell, the fuel cell unit can be caused to output a preset current by adjusting the supply amount of hydrogen and the supply amount of air.
S105, obtaining the output current of the fuel cell unit, and calculating the fluctuation rate of the output current. For example, after hydrogen and air are supplied into the fuel cell unit, the hydrogen and oxygen participate in the reaction inside the fuel cell unit to generate electric energy and heat energy, and an output current of the fuel cell unit can be obtained by providing a current sensor or other detecting element on the electric energy output side. Since part of nitrogen still possibly remains in the fuel cell unit, the output electric energy is unstable on the premise that the mixed gas of the nitrogen and the hydrogen participates in the reaction, and therefore whether the output current is stable or not can be judged by calculating the fluctuation rate of the output current.
Among them, there are various calculation methods of the fluctuation ratio of the output current, and for example, the calculation methods may be: and collecting a plurality of current values, and calculating the ratio of the latter current value to the former current value as the fluctuation rate. Or collecting a plurality of current values, calculating the difference value between the latter current value and the former current value, and calculating the ratio of the difference value and the former current value as the fluctuation rate. For another example, a difference between a maximum value and a minimum value of a plurality of current values acquired in a period of time is calculated, and a ratio between the difference and the minimum value is calculated as a fluctuation ratio. In short, any calculation method that can effectively reflect the stability of the output current may be used as an alternative to the above-described calculation method for the fluctuation ratio.
And S107, judging the magnitude of the fluctuation rate and the fluctuation rate threshold. For example, after the fluctuation ratio is calculated, the magnitude of the fluctuation ratio and the fluctuation ratio threshold value is determined by calculating the ratio or the difference between them. Wherein the volatility threshold value may be determined experimentally or may be determined empirically.
And S109, when the fluctuation rate is smaller than the fluctuation rate threshold value, controlling the fuel cell unit to supply power for the load by using the preset current. For example, when the ripple rate is smaller than the ripple rate threshold, it is proved that the output current of the fuel cell unit is stable at this time, and a stable current can be provided to the load. At this time, the load is connected to the fuel cell, and the load is powered by a preset current generated by the fuel cell.
The method for controlling the start and stop of the fuel cell unit comprises the steps of judging the fluctuation rate of output current while supplying hydrogen and air to the fuel cell unit after purging is finished, and controlling the fuel cell unit to supply power to a load when the fluctuation rate is smaller than a fluctuation rate threshold value. By using the preset current smaller than the load demand current as the load power supply, the load can be operated with small current after being started, and the ideal operation environment of the fuel cell unit is constructed by using the heat and the liquid water generated by the fuel cell unit in the small current operation process, so that the operation performance of the fuel cell is ensured.
Possible embodiments of the present application are described below.
In one possible embodiment, after S109, the start-stop control method further includes: obtaining the reaction temperature and the reaction humidity of the fuel cell unit; judging the magnitudes of the reaction temperature and the lower temperature threshold value and the magnitudes of the reaction humidity and the lower humidity threshold value; if the reaction temperature is less than the lower temperature threshold and/or the reaction humidity is less than the lower humidity threshold, controlling the output current of the fuel cell unit to be increased until the output current reaches the required current; and if the reaction temperature is greater than or equal to the lower temperature threshold and the reaction humidity is greater than or equal to the lower humidity threshold, controlling the output current of the fuel cell unit to be increased to the required current, and controlling the output voltage of the fuel cell unit to be increased to the required voltage of the load.
Specifically, after the small current is used as the load to supply power, an ideal operation environment of the fuel cell needs to be quickly built, and main parameters affecting the operation performance of the fuel cell unit are temperature and humidity, so that in the step, the reaction temperature and the reaction humidity of the fuel cell unit are obtained to judge whether the temperature and the humidity inside the fuel cell unit reach the standard. When at least one of the reaction temperature is smaller than the lower temperature threshold and the reaction humidity is smaller than the lower humidity threshold, the temperature and the humidity inside the current fuel cell unit are proved to be not up to the standard. At this time, since the output current of the fuel cell unit does not reach the required current of the load, a rapid increase in the reaction temperature and the reaction humidity can be achieved by increasing the output current of the fuel cell unit, and if the output current of the fuel cell unit has increased to the required current of the load, the current output state is maintained. On the contrary, when the reaction temperature is greater than or equal to the lower temperature threshold and the reaction humidity is greater than or equal to the lower humidity threshold, the fact that the temperature and the humidity inside the fuel cell unit reach the standards is proved, the output current of the fuel cell unit is controlled to be increased to the required current of the load (if the required current is not yet reached), the output voltage of the fuel cell unit is adjusted to the required voltage of the load (if the required voltage is not yet reached), and the starting process of the system can be completed.
It should be noted that, the output current and the output voltage of the fuel cell unit, that is, the supply amounts of hydrogen and air are adjusted, and a fixed comparison relationship exists between the output current/voltage and the supply amount of hydrogen/air, and the determination manner can be determined by a comparison table or a formula, and is a conventional means in the art, which is not described in detail in this application.
In the present application, the reaction temperature and the reaction humidity may be obtained by providing a temperature sensor and a humidity sensor inside the fuel cell. Of course, the reaction temperature and the reaction humidity may be obtained by other locations, for example, indirectly by providing a temperature sensor and a humidity sensor through a fuel outlet or an oxidizer outlet.
After the small current operation, the reaction temperature and the reaction humidity of the fuel cell unit are judged, and the output current of the fuel cell unit is improved based on the judgment result, so that the inside of the fuel cell unit can quickly reach an ideal operation environment, and the quick start of the fuel cell unit is completed.
In one possible embodiment, the start-stop control method further includes: after the purging is finished, the reaction temperature of the fuel cell unit is obtained; judging the reaction temperature and the upper temperature threshold value; and when the reaction temperature is greater than or equal to the upper temperature threshold, controlling the heat dissipation unit to start operation.
Specifically, after the purging is completed, the cooling circulation pump is turned on while hydrogen and air are supplied to the fuel cell unit, and the reaction temperature of the fuel cell unit is acquired, and whether the circulation branch or the radiator branch is started is determined based on the reaction temperature and the upper temperature threshold. When the reaction temperature is less than the upper temperature threshold, a circulation branch is started, namely the first interface of the three-way control valve is communicated with the third interface, and only cooling water circulates at the moment. When the reaction temperature is greater than or equal to the upper temperature threshold, the radiator branch, namely the second interface of the three-way control valve, is started to be communicated with the third interface, and the radiator is started to run, so that circulation between the radiator and the fuel cell unit can be realized, and the fuel cell unit is cooled through the radiator. Wherein the upper temperature threshold is determined experimentally or empirically.
By controlling the heat dissipation unit to start running according to the reaction temperature of the fuel cell unit after the purging is finished, the reaction temperature inside the fuel cell unit can be ensured to be balanced, and the conditions of local overheating and the like can not occur.
In one possible implementation manner, the start-stop control method further includes: after receiving the start signal, detecting whether the fuel cell unit contains residual hydrogen and liquid water; if the fuel cell unit contains neither residual hydrogen nor liquid water, the purging unit is controlled to purge the fuel cell unit.
Specifically, the inside of the fuel cell unit is provided with a hydrogen ion detection module and a liquid water detection module, wherein the hydrogen ion detection module is used for detecting whether the inside of the fuel cell unit contains residual hydrogen gas, and the liquid water detection module is used for detecting whether the inside of the fuel cell unit contains residual liquid water. After receiving the starting signal, the hydrogen ion detection module and the liquid water detection module are controlled to work at first, and whether the fuel cell unit contains residual hydrogen and liquid water is detected. In this application, nitrogen purging is required to be performed to discharge residual hydrogen and liquid water inside the fuel cell unit at the start-up and before the shutdown of the fuel cell unit. And once the residual hydrogen and/or liquid water in the fuel cell unit is detected after the start-up, the fuel cell unit is proved to be possibly failed, and the stop alarm is given at the moment. If the residual hydrogen and/or liquid water in the fuel cell unit is not detected, the fuel cell unit is proved to be normal, and the nitrogen purging step can be continuously performed.
The hydrogen ion detection module and the liquid water detection module are not limited in the application, and any element capable of realizing hydrogen ion detection and liquid water detection can be applied to the application.
In one possible implementation manner, the start-stop control method further includes: after receiving the starting signal, judging whether a supercharging device of the oxidant supply unit is connected or not; if the pressurizing device is connected, the purging unit is controlled to purge the fuel cell unit.
For example, whether the air compressor is connected may be determined by determining whether an electrical signal from the air compressor is received. If the electric signal of the air compressor is not received, the air compressor is proved to possibly fail, and the machine is stopped at the moment to give an alarm. If the electric signal of the air compressor is received, the air compressor is proved to be in a normal state, and the air compressor can be started subsequently.
By judging whether residual hydrogen and liquid water exist in the fuel cell unit before starting purging, the state of the fuel cell unit after the previous shutdown can be effectively monitored. By judging whether the pressurizing device of the oxidant supply unit is connected before purging, the starting process after purging can be ensured to be carried out stably.
In one possible implementation manner, the start-stop control method further includes: and when the fluctuation rate is smaller than the fluctuation rate threshold value, controlling the fuel cell unit to supply power for the load by using a preset current. And when the fluctuation rate is greater than or equal to the fluctuation rate threshold value, controlling the electricity storage unit to store electricity.
Specifically, when the ripple rate is smaller than the ripple rate threshold value, it is proved that the output current of the fuel cell unit is stabilized at this time, and a stabilizing current can be supplied to the load. At the moment, the load is connected to the fuel cell, and the load is powered by the preset current generated by the fuel cell, so that the load runs under a constant current under a smaller current. When the fluctuation ratio is larger than or equal to the fluctuation ratio threshold value, the output current of the current fuel cell unit is proved to be unstable, and stable current can not be provided for the load. The storage battery can be controlled to store the electric energy generated by the fuel cell unit at this time.
When the fluctuation rate of the output current is larger than or equal to the fluctuation rate threshold value, the electric energy generated by the fuel cell unit is stored in the electricity storage unit, so that low-efficiency energy storage can be realized, and the utilization rate of the total energy is improved.
In one possible implementation manner, the start-stop control method further includes: when a shutdown instruction is received, controlling the oxidant supply unit to stop the supply of the oxidant gas; after stopping the supply of the oxidizing gas, controlling the fuel supply unit to decrease the supply amount of the fuel gas, and controlling the output current of the fuel cell unit to decrease; obtaining an output voltage of a fuel cell unit; judging the magnitude of the output voltage and a preset voltage threshold value; if the output voltage is greater than or equal to a preset voltage threshold value, controlling the fuel supply unit to continuously reduce the fuel gas supply amount; if the output voltage is less than the preset voltage threshold, the fuel supply unit is controlled to stop the supply of the fuel gas.
Specifically, since the hydrogen side supply pressure is generally greater than the air side supply pressure, if the hydrogen supply is stopped first, corrosion of the electrode occurs, and therefore, the present application, upon receiving a stop command, stops the supply of air first, and after stopping the supply of air, does not immediately stop the supply of hydrogen, but controls the hydrogen supply amount to decrease, and at the same time controls the output current of the fuel cell unit to decrease, so as to consume the remaining hydrogen in the fuel cell unit. Meanwhile, the output voltage of the fuel cell unit is obtained, and the output voltage and the preset voltage threshold value are judged, so that the residual hydrogen amount in the fuel cell unit is judged. If the output voltage is greater than or equal to the preset voltage threshold, the fuel cell unit is proved to have more residual hydrogen, and the fuel supply unit is controlled to continuously reduce the fuel gas supply amount at the moment so as to continuously consume the residual hydrogen. If the output voltage is less than the preset voltage threshold, it is confirmed that the residual hydrogen gas has been substantially consumed, at which time the fuel supply unit is controlled to stop the supply of the fuel gas.
Preferably, in the above process, the storage battery can be continuously turned on to store the electric energy output by the fuel cell unit, so as to realize low-efficiency energy storage and improve the utilization rate of the total energy.
By stopping the supply of the oxidizer supply unit and then reducing the supply amount of the fuel supply unit when the stop instruction is received, the occurrence of corrosion of the electrode caused by stopping the supply of the fuel first can be avoided. By reducing the output current of the fuel cell unit while reducing the fuel supply amount, the remaining fuel can be efficiently consumed.
In one possible embodiment, after the step of "controlling the fuel supply unit to stop the supply of the fuel gas", the start-stop control method further includes: controlling a purging unit to purge the fuel cell unit; after the purging is finished, the fuel cell unit is controlled to stop supplying power to the load.
Specifically, after the fuel supply unit is controlled to stop the supply of the fuel gas, the purge unit is turned on, and the fuel cell unit is purged with nitrogen gas, for example, for 20 seconds, to discharge the hydrogen gas and the liquid water remaining inside the fuel cell unit.
By purging the fuel cell unit after the fuel supply unit is controlled to stop supplying the fuel gas, no residual gas in the fuel cell unit after purging is finished can be ensured, and the running stability of the system is ensured.
In a possible implementation manner, the start-stop control method further includes: acquiring a reaction temperature of the fuel cell unit while or after controlling the fuel supply unit to stop the supply of the fuel gas; judging the reaction temperature and the stop temperature threshold value; and if the reaction temperature is smaller than the stop temperature threshold value, controlling the heat dissipation unit to stop running.
Specifically, after stopping the supply of the fuel gas, the temperature inside the fuel cell unit is still high, and it is necessary to reduce the temperature inside the fuel cell unit, so that the influence of the excessive temperature inside the fuel cell unit after the shutdown on the service life of the fuel cell unit is avoided. At this time, the reaction temperature of the fuel cell unit is obtained, and if the reaction temperature is less than the stop temperature threshold value, it is proved that the internal temperature of the current fuel cell unit has fallen to a proper temperature, at which time the cooling circulation water pump and the radiator are turned off. If the reaction temperature is greater than or equal to the stop temperature threshold, the internal temperature of the current fuel cell unit is still higher, and the cooling circulating water pump and the radiator are controlled to be kept on at the moment so as to cool the internal of the fuel cell unit.
Wherein the stop temperature threshold may be determined experimentally or empirically, such as may be set to a current indoor temperature, etc.
By controlling the heat radiating unit to stop operation when the reaction temperature of the fuel cell unit is less than the temperature lower limit threshold value while or after stopping the supply of the fuel gas, it is possible to ensure that the internal temperature of the fuel cell is stable.
In one possible embodiment, after the step of "controlling the fuel cell unit to stop supplying power to the load", the start-stop control method further includes: detecting whether the fuel cell unit contains residual hydrogen and liquid water; if the fuel cell unit contains neither residual hydrogen nor liquid water, the fuel cell system is controlled to stop.
After the nitrogen is purged and the load is disconnected, the hydrogen ion detection module and the liquid water detection module are controlled to work, and whether the fuel cell unit contains residual hydrogen and liquid water is detected. Since the nitrogen purge has been performed, in theory no hydrogen and no liquid water should remain inside the fuel cell unit at this time, so that once the presence of residual hydrogen and/or liquid water inside the fuel cell unit is detected, it is proved that the fuel cell unit may malfunction, at which point a shutdown alarm is given. If the residual hydrogen and/or liquid water in the fuel cell unit is not detected, the fuel cell unit is proved to be normal in state, and the shutdown of the fuel cell system can be controlled.
Through judging whether there are residual hydrogen and liquid water in the fuel cell unit after the fuel cell unit stops supplying power, can carry out effective monitoring before shutting down the fuel cell unit, guarantee that the inside of fuel cell unit has no hydrogen and liquid water to remain after the blowing.
One possible start-up and shut-down procedure of the fuel cell system of the present application is described below in conjunction with fig. 3 and 4. Wherein fig. 3 is a logic diagram of a start-up procedure of the fuel cell system of the present application;
fig. 4 is a logic diagram of a shutdown process of the fuel cell system of the present application.
As shown in fig. 3, during one possible start-up of the fuel cell system:
s201, a starting-up instruction is received, and then S202 is executed.
S202, judging whether the state of the fuel cell unit is normal, namely controlling the operation of the hydrogen ion detection module and the liquid water detection module, and detecting whether the fuel cell unit contains residual hydrogen and liquid water. If the fuel cell unit does not contain residual hydrogen and liquid water, S203 is performed; otherwise, if the fuel cell unit contains residual hydrogen or liquid water, S216 is performed.
S203, judging whether the air compressor is connected? If the air compressor is already connected, S204 is performed; otherwise, if the air compressor is not connected, S216 is performed.
S204, a nitrogen purge is started for 20S, and then S205 and S212 are performed.
S205, the flow control valve and the pressure regulating valve are controlled to be opened, hydrogen gas is supplied to the fuel cell unit, and then S206 is performed.
S206, after the hydrogen gas is supplied for 5S, the hydrogen circulation pump and the air compressor are turned on, and then S207 is performed.
S207, obtaining the output current of the fuel cell unit, calculating the fluctuation rate eta of the output current, and judging whether eta < eta 1 is true? If so, then S208 is performed; otherwise, if not, the process returns to re-execution S207 and the electric energy output from the fuel cell unit is stored in the battery. Where η1 is the volatility threshold.
S208, controlling the fuel cell unit to supply power to the load with a preset current, and then executing S209, wherein the preset current is smaller than the required current of the load.
S209, obtaining the reaction temperature T and the reaction humidity H of the fuel cell unit, and judging whether T is more than or equal to T1 and H is more than or equal to H1 are true? If so, then S211 is performed; otherwise, if not, executing S210; wherein T1 is a temperature lower threshold, and H1 is a humidity lower threshold.
S210, the output current of the fuel cell unit is increased, and then S209 is performed back.
S211, adjusting the output current of the fuel cell unit to be the required current, and adjusting the output voltage of the fuel cell unit to be the required voltage, wherein the system is started.
S212, the cooling circulating water pump is started, and then S213 is executed.
S213, obtaining the reaction temperature T of the fuel cell unit, and judging whether T is equal to or greater than T2 is true? If so, then S214 is performed; otherwise, if not, executing S215; where T2 is the upper temperature threshold.
S214, starting the radiator branch.
S215, starting a circulation branch.
S216, stopping the machine to give an alarm.
As shown in fig. 4, during one possible shutdown of the fuel cell system:
s301, a shutdown instruction is received, and then S302 is executed.
S302, the oxidant supply unit is controlled to stop the supply of air, and then S303 is performed.
S303, the fuel supply unit is controlled to decrease the hydrogen gas supply amount while controlling the output current of the fuel cell unit to decrease, and then S304 is performed.
S304, obtaining the output voltage U of the fuel cell unit, and judging whether U < U1 is true? If so, executing S305 and S308; otherwise, if not, execution returns to S303.
S305, the fuel supply unit is controlled to stop the supply of hydrogen gas, and then S306 is executed.
S306, a nitrogen purge is turned on for 20S, and then S307 is performed.
S307, controlling the fuel cell unit to stop supplying power to the load, and then executing S311 after the execution of step S310 is completed.
S308, the reaction temperature T of the fuel cell unit is acquired, and S309 is then performed.
S309, judging whether T < T3 is true? If so, then S310 is performed; otherwise, if not, execution returns to S308.
S310, the cooling circulating water pump is turned off, the radiator is turned off, and then S311 is executed after the execution of the step S307 is completed.
S311, judging whether the state of the fuel cell unit is normal, namely controlling the operation of the hydrogen ion detection module and the liquid water detection module to detect whether the fuel cell unit contains residual hydrogen and liquid water. If the fuel cell unit does not contain residual hydrogen and liquid water, S312 is performed; otherwise, if the fuel cell unit contains residual hydrogen or liquid water, S313 is performed.
S312, control the fuel cell system to stop.
S313, stopping the machine to give an alarm.
Although the steps are described in the above-described sequential order in the above-described embodiments, it will be appreciated by those skilled in the art that, in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and these simple variations are within the scope of the present application.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will be within the scope of the present application.
Claims (10)
1. A start-stop control method of a fuel cell system is characterized in that the fuel cell system comprises a fuel cell unit, a fuel supply unit, an oxidant supply unit and a purge unit, wherein the fuel cell unit comprises a fuel inlet, a fuel outlet, an oxidant inlet and an oxidant outlet, the fuel supply unit and the purge unit are communicated with the fuel inlet, the oxidant supply unit is communicated with the oxidant inlet,
The start-stop control method comprises the following steps:
after receiving a starting instruction, controlling the purging unit to purge the fuel cell unit;
after purging is finished, controlling the fuel supply unit and the oxidant supply unit to supply fuel gas and oxidant gas to the fuel cell unit respectively so that the fuel cell unit outputs a preset current;
obtaining the output current of the fuel cell unit and calculating the fluctuation rate of the output current;
judging the magnitude of the fluctuation rate and the fluctuation rate threshold;
when the fluctuation rate is smaller than the fluctuation rate threshold value, controlling the fuel cell unit to supply power for a load by using the preset current;
the preset current is smaller than the required current of the load.
2. The start-stop control method of a fuel cell system according to claim 1, characterized in that, after the step of controlling the fuel cell unit to supply the load with the preset current, the start-stop control method further comprises:
acquiring the reaction temperature and the reaction humidity of the fuel cell unit;
judging the magnitudes of the reaction temperature and the lower temperature threshold value and the magnitudes of the reaction humidity and the lower humidity threshold value;
If the reaction temperature is less than the lower temperature threshold and/or the reaction humidity is less than the lower humidity threshold, controlling the output current of the fuel cell unit to increase until the output current reaches the required current;
and if the reaction temperature is greater than or equal to the lower temperature threshold and the reaction humidity is greater than or equal to the lower humidity threshold, controlling the output current of the fuel cell unit to be increased to the required current, and controlling the output voltage of the fuel cell unit to be increased to the required voltage of the load.
3. The start-stop control method of a fuel cell system according to claim 1, wherein the fuel cell system further comprises a heat radiating unit for cooling the fuel cell unit,
the start-stop control method further comprises the following steps:
after purging is finished, obtaining the reaction temperature of the fuel cell unit;
judging the reaction temperature and the upper temperature threshold value;
and when the reaction temperature is greater than or equal to the upper temperature threshold, controlling the heat dissipation unit to start running.
4. The start-stop control method of a fuel cell system according to claim 1, characterized in that the start-stop control method further comprises:
After receiving a starting signal, detecting whether the fuel cell unit contains residual hydrogen and liquid water;
and if the fuel cell unit contains neither residual hydrogen nor liquid water, controlling the purging unit to purge the fuel cell unit.
5. The start-stop control method of a fuel cell system according to claim 4, characterized in that the start-stop control method further comprises:
after receiving the starting signal, judging whether a supercharging device of the oxidant supply unit is connected or not;
and if the supercharging device is connected, controlling the purging unit to purge the fuel cell unit.
6. The start-stop control method of a fuel cell system according to claim 1, characterized in that the fuel cell system further comprises an electricity storage unit connected to the fuel cell unit, the start-stop control method further comprising:
and when the fluctuation rate is greater than or equal to the fluctuation rate threshold value, controlling the electricity storage unit to store electricity.
7. The start-stop control method of a fuel cell system according to any one of claims 1 to 6, characterized in that the start-stop control method further comprises:
When a shutdown instruction is received, controlling the oxidant supply unit to stop the supply of the oxidant gas;
after stopping the supply of the oxidizing gas, controlling the fuel supply unit to decrease the supply amount of the fuel gas, and controlling the output current of the fuel cell unit to decrease;
acquiring an output voltage of the fuel cell unit;
judging the output voltage and a preset voltage threshold value;
if the output voltage is greater than or equal to the preset voltage threshold value, controlling the fuel supply unit to continuously reduce the fuel gas supply amount;
and if the output voltage is smaller than the preset voltage threshold value, controlling the fuel supply unit to stop the supply of the fuel gas.
8. The start-stop control method of a fuel cell system according to claim 7, characterized in that, after the step of controlling the fuel supply unit to stop the supply of fuel gas, the start-stop control method further comprises:
controlling the purging unit to purge the fuel cell unit;
and after the purging is finished, controlling the fuel cell unit to stop supplying power to the load.
9. A start-stop control method of a fuel cell system according to claim 7 when dependent on claim 3, characterized in that the start-stop control method further comprises:
Acquiring a reaction temperature of the fuel cell unit while or after controlling the fuel supply unit to stop the supply of the fuel gas;
judging the reaction temperature and the stop temperature threshold value;
and if the reaction temperature is smaller than the stop temperature threshold value, controlling the heat dissipation unit to stop running.
10. The start-stop control method of a fuel cell system according to claim 8, characterized in that, after the step of controlling the fuel cell unit to stop supplying power to a load, the start-stop control method further comprises:
detecting whether the fuel cell unit contains residual hydrogen and liquid water;
if the fuel cell unit contains neither residual hydrogen nor liquid water, the fuel cell system is controlled to stop.
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| CN202210113782.4A CN116565261A (en) | 2022-01-30 | 2022-01-30 | Start-stop control method for fuel cell system |
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