CN111546946B - Method for improving working characteristics of fuel cell under light load - Google Patents
Method for improving working characteristics of fuel cell under light load Download PDFInfo
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- CN111546946B CN111546946B CN202010403003.5A CN202010403003A CN111546946B CN 111546946 B CN111546946 B CN 111546946B CN 202010403003 A CN202010403003 A CN 202010403003A CN 111546946 B CN111546946 B CN 111546946B
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- automobile
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- 239000000446 fuel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003570 air Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000001257 hydrogen Substances 0.000 claims abstract description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000110 cooling liquid Substances 0.000 claims abstract description 6
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910002842 PtOx Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/32—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load
- B60L58/33—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load by cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
-
- 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
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
-
- 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
- H01M8/0491—Current of fuel cell stacks
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a method for improving the working characteristics of a fuel cell under light load, wherein the fuel cell system comprises a gas circuit liquid circuit system, a pile, DC/DC (direct current/direct current), an auxiliary battery, an automobile load and a controller, the gas circuit liquid circuit system supplies hydrogen, air and cooling liquid for the pile, the pile is a core of energy conversion, chemical energy of hydrogen fuel is converted into electric energy, the DC/DC supplies power for the load, the auxiliary battery is charged at the same time, the auxiliary battery is used for providing an initial energy starting system for the whole system, the auxiliary pile outputs power together with the load and stores redundant energy, and the controller is a monitoring center and a control center of the whole system; the method can avoid the problem that the output performance is reduced due to the fact that the current is reduced and the voltage is increased when the electric pile has to work under low load after the auxiliary battery is fully charged under the condition of uniform speed and low speed for a long time, and can obviously improve the performance of the battery and obviously prolong the service life of the electric pile.
Description
[ technical field ]
The invention belongs to the field of hydrogen fuel cells, and particularly relates to a method for improving the working characteristics of a fuel cell under light load.
[ background Art ]
Currently, hydrogen fuel cells have a tendency to be used in automobiles on a large scale, but the power output characteristics of hydrogen fuel cells are characteristic of the load characteristics of automobiles when they are operated. The hydrogen fuel cell has the advantages of high energy conversion efficiency, strong power conversion capability, cleanness, silence and the like. The service life of a fuel cell can reach decades if it is within its optimal operating condition range. However, automobiles are a very variable load, and the power required at engine start and acceleration is several times or even tens times that required at normal constant speed. And even at a constant speed, the power required for high-speed running and low-speed running is very different. Thus, driving an automobile with a fuel cell, such an automobile load characteristic presents a great challenge to the fuel cell. Because the fuel cell has an adverse effect on its service life in the event of too great or too small a load.
When the fuel cell is operated at a low load, the current density decreases and the voltage of the single cell increases, for example, more than 0.8V, and a series of problems occur that affect the stability of the output performance. At this time, pt in the fuel cell catalyst is gradually oxidized into PtOx, and the output performance is reduced due to long-term operation; in the case of low current density operation, the generation of water in the fuel cell is relatively small, the humidity of the reaction layer is low, the conduction resistance of the proton membrane is high, the output performance of the cell is gradually reduced, and the stable operation is adversely affected. Therefore, not only is fuel efficiency low, but also the resulting PtOx is one of the key factors that reduce the operating life of the fuel cell proton membrane at low output performance.
[ summary of the invention ]
The invention aims to solve the defects and provide a method for improving the working characteristics of a fuel cell under light load, which can avoid the problems that the current density of the fuel cell is reduced under low load, the output performance of the cell is gradually reduced, and the stable operation is influenced.
In order to achieve the above object, a method for improving the working characteristics of a fuel cell under light load is designed, a fuel cell system comprises a gas circuit liquid circuit system, a pile, DC/DC, an auxiliary battery, an automobile load and a controller, wherein the gas circuit liquid circuit system is connected with the pile, the gas circuit liquid circuit system supplies hydrogen, air and cooling liquid for the pile, the pile is an energy conversion core and converts chemical energy of hydrogen fuel into electric energy, an output end of the pile is connected with the DC/DC, the DC/DC is respectively connected with the auxiliary battery and the automobile load, the DC/DC is used for converting unstable voltage output by the pile to form voltage which is matched with and stable to the automobile load to supply power to the automobile load, the auxiliary battery is a power consumption part comprising an automobile motor and a circuit, the auxiliary battery is used for providing initial energy for the whole system to start the system, the auxiliary pile outputs power together with the automobile load and stores redundant energy to participate in driving the automobile load under high output, and the liquid circuit system, the pile, the DC/DC and the automobile load are respectively connected with the controller to the whole system to monitor the whole system, and the controller is orderly operated under the control system; when the automobile runs at a constant speed or a low speed for a long time, the controller controls the DC/DC to fully charge the auxiliary battery, the electric pile works under a low load to reduce the performance of the fuel battery, at the moment, the controller is used for controlling the gas circuit liquid circuit system to reduce the air inflow of air, and meanwhile, the output current is increased to keep the total output voltage of the battery unchanged obviously; due to the increase of the current, the voltage of the single cell is reduced, so that the oxidized Pt catalyst is effectively reduced; and the water quantity generated by the internal reaction of the fuel cell is increased due to the increase of the current, the humidity of the reaction layer is increased, and the proton membrane conduction resistance is reduced; and finally, when the air supply is recovered to be normal, the controller is utilized to reduce the output current of the battery, so that the battery is recovered to the original proper low-power output working range.
The invention also provides a method for improving the working characteristics of the fuel cell under light load, wherein the fuel cell system comprises a gas circuit liquid circuit system, a pile, DC/DC, an auxiliary battery, an automobile load and a controller, wherein the gas circuit liquid circuit system is connected with the pile, the gas circuit liquid circuit system provides hydrogen, air and cooling liquid for the pile, the pile is an energy conversion core and converts chemical energy of hydrogen fuel into electric energy, the output end of the pile is connected with the DC/DC, the DC/DC is respectively connected with the auxiliary battery and the automobile load, the DC/DC is used for converting unstable voltage output by the pile, forming voltage which is matched with and stable to the automobile load to supply power to the automobile load, and simultaneously charging the auxiliary battery, the automobile load is a power consumption part comprising an automobile motor and a circuit, the auxiliary battery is used for providing initial energy for starting the system, the auxiliary pile outputs power together with the automobile load, and stores redundant energy to participate in driving the automobile load under high output, and the gas circuit system, the pile, the DC/DC and the auxiliary battery are respectively connected with the controller to the automobile load, and the whole system is controlled by the monitoring center, and the control system is orderly operated; the control method is that when the auxiliary battery is charged normally, the charging is stopped before the auxiliary battery is fully charged, so that the auxiliary battery is left with allowance; when the load is light for a long time, the load current is increased for a short time under the condition that the air flow of the air circuit liquid circuit system is not changed; the increased output of the fuel cell can charge the auxiliary battery for a short time; when the charging current is increased by the electric pile, the voltage of the fuel cell monolithic is reduced, so that the oxidized Pt catalyst is effectively reduced, and the electric pile is restored to the initial output performance in a short time; after the electric pile enters the low-load state and outputs for a period of time, the battery enters the performance reduction state again, and the controller is used for increasing the charging current for a short time at the moment, so that the electric pile can be ensured not to work in the low-performance working range for a long time through circulation.
Further, in the control method, the output power is increased due to the increase of the load current, and the part of electric energy is used for increasing the circulation rate of the automobile to the cooling system so as to reduce the battery temperature and keep the actual driving power of the fuel cell to the automobile stable.
Compared with the prior art, the invention provides a method for improving the working characteristics of the fuel cell under light load, which can avoid the problems that when a vehicle is in constant speed and low speed for a long time, an auxiliary battery is full, and a cell stack has to work under low load, the current is reduced, the voltage is increased, and the problem of reduction of output performance is caused.
[ description of the drawings ]
Fig. 1 is a functional block diagram of a fuel cell system of the present invention;
FIG. 2 is a schematic diagram of fuel cell run time versus cell output power in accordance with the present invention;
fig. 3 is a schematic diagram of the fuel cell run time versus cell voltage of the present invention.
Detailed description of the preferred embodiments
The invention is further described below with reference to the accompanying drawings:
the invention provides a method for improving the working characteristics of a fuel cell under light load, wherein a vehicular hydrogen fuel cell system comprises a gas circuit liquid circuit system, a pile, DC/DC, an auxiliary cell, an automobile load and a controller, the connection mode of each part is shown as the attached figure 1, the gas circuit liquid circuit system is connected with the pile, the gas circuit liquid circuit system supplies hydrogen, air and cooling liquid for the pile, the pile is an energy conversion core and converts chemical energy of hydrogen fuel into electric energy, the output end of the pile is connected with the DC/DC, the DC/DC is respectively connected with the auxiliary cell and the automobile load, the DC/DC is used for converting unstable voltage output by the pile, the voltage which is matched with the automobile load and stable is used for supplying power to the automobile load, the automobile load is a power consumption part comprising an automobile motor and a circuit, the auxiliary cell is used for providing initial energy for starting the system, the auxiliary pile is used for the automobile load to output power together, and stores redundant energy to drive the automobile load under high output, the gas circuit system, the pile, the DC/DC and the auxiliary cell are respectively connected with the controller to the controller, and the controller is used for the whole system to monitor the whole system to operate orderly.
That is, the functions of the respective components of the hydrogen fuel cell system for a vehicle are: the gas circuit liquid path system provides hydrogen, air and cooling liquid for the galvanic pile; the electric pile is a core for energy conversion and converts chemical energy of hydrogen fuel into electric energy; the DC/DC converts the unstable voltage output by the pile to form a voltage which is matched with a load and stable to supply power for the load, and the DC/DC also has the function of charging an auxiliary battery; the auxiliary battery has the functions of providing an initial energy starting system for the whole system, outputting power for loads by the auxiliary electric pile, storing redundant energy and participating in driving automobile loads at high output; the controller is a monitoring center and a control center of the whole system, so that the whole system can orderly run; the automobile load is the power consumption part of an automobile motor, a circuit and the like.
The specific working flow is as follows: under the conventional condition, when the automobile is started or accelerated, the load is heavier, and the controller controls the DC/DC and the auxiliary battery to supply power to the load at the same time; when the automobile runs down a slope at a constant speed or at a constant load, the controller controls the DC/DC to supply power to the automobile and charge the auxiliary battery to supplement energy, so that the output of the electric pile works in a proper area, and the normal performance of the electric pile is ensured. However, in special cases, such as a case where the auxiliary battery is already full for a long time at a constant speed and a low speed, the current of the pile is reduced, the voltage is increased, and the output performance is reduced.
The first method is that when the automobile runs at a constant speed or a low speed for a long time and the controller controls the DC/DC to fully charge the auxiliary battery, and the electric pile has to work at a low load to reduce the performance of the fuel battery, the controller can be used for controlling the air circuit and the liquid circuit system to reduce the air inflow of air and increase the output current at the same time so as to keep the total output voltage of the battery unchanged obviously. But at this time, the cell monolithic voltage has been reduced due to the increase in current, and the oxidized Pt catalyst can be effectively reduced. Meanwhile, due to the increase of current, the water quantity generated by the internal reaction of the fuel cell can also be increased, the humidity of a reaction layer becomes high, the conduction resistance of the proton membrane is reduced, and the output performance of the cell can be gradually improved. When the air supply is recovered to be normal, the output current of the battery is reduced, and the battery can be recovered to the original proper low-power output working range.
The second method is that when the auxiliary battery is charged normally, the charging is stopped before the auxiliary battery is fully charged, so that the auxiliary battery leaves a margin; when the load is light for a long time, the load current is increased for a short time under the condition that the air flow of the air circuit liquid circuit system is not changed; the increased output of the fuel cell can charge the auxiliary battery for a short time; when the stack increases the charging current, the fuel cell monolithic voltage is reduced, allowing the oxidized Pt catalyst to be effectively reduced, so that the stack returns to its original output performance in a shorter period of time. After the electric pile enters a low-load state and is output for a period of time, the battery enters a performance reduction state, and at the moment, the charging current can be increased for a short time, so that the electric pile can be circulated, the electric pile can be ensured not to work in a low-performance working range for a long time, the energy efficiency is improved, the performance and the service life of the battery are ensured not to be influenced, or at least the influence degree can be reduced. In addition, the output power is increased due to the increase of the load current, and the electric energy can be used for increasing the circulation multiplying power of the automobile to the cooling system, reducing the battery temperature and keeping the actual driving power of the fuel cell to the automobile stable.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the invention are intended to be equivalent substitutes and are included in the scope of the invention.
Claims (1)
1. A method of improving the operating characteristics of a fuel cell at light load, comprising: the fuel cell system comprises a gas circuit liquid path system, a pile, DC/DC, an auxiliary battery, an automobile load and a controller, wherein,
the system comprises an air circuit liquid circuit system, an electric pile, an auxiliary battery, a controller, a monitoring center and a control center, wherein the air circuit liquid circuit system is connected with the electric pile, the air circuit liquid circuit system is used for supplying hydrogen, air and cooling liquid to the electric pile, the electric pile is an energy conversion core and converting chemical energy of hydrogen fuel into electric energy, the output end of the electric pile is connected with the DC/DC, the DC/DC is respectively connected with the auxiliary battery and the automobile load, the DC/DC is used for converting unstable voltage output by the electric pile to form voltage which is matched with and stable with the automobile load to supply power to the automobile load, the auxiliary battery is used for charging the auxiliary battery, the automobile load is a power consumption part comprising an automobile motor and a circuit, the auxiliary battery is used for supplying initial energy to start the system for the whole system, and storing redundant energy to participate in driving the automobile load during high output, and the air circuit liquid system, the electric pile, the DC/DC, the auxiliary battery and the automobile load are respectively connected with the controller, and the controller is a monitoring center and a control center of the whole system and is used for orderly running;
when the automobile runs at a constant speed or a low speed for a long time, the controller controls the DC/DC to fully charge the auxiliary battery, the electric pile works under a low load to reduce the performance of the fuel battery, at the moment, the controller is used for controlling the gas circuit liquid circuit system to reduce the air inflow of air, and meanwhile, the output current is increased to keep the total output voltage of the fuel battery unchanged obviously; due to the increase of the current, the voltage of the fuel cell monolithic is reduced, so that the oxidized Pt catalyst is effectively reduced; and the water quantity generated by the internal reaction of the fuel cell is increased due to the increase of the current, the humidity of the reaction layer is increased, and the proton membrane conduction resistance is reduced; finally, when the air supply is recovered to be normal, the controller is utilized to reduce the output current of the fuel cell, so that the fuel cell is recovered to the original proper low-power output working range;
or, when the auxiliary battery is normally charged, stopping charging before the auxiliary battery is fully charged, so that a margin is left; when the load is light for a long time, the load current is increased for a short time under the condition that the air flow of the air circuit liquid circuit system is not changed; the increased output of the fuel cell can charge the auxiliary battery for a short time; when the output current is increased by the electric pile, the voltage of the fuel cell monolithic is reduced, so that the oxidized Pt catalyst is effectively reduced, and the electric pile is restored to the initial output performance in a short time; after the electric pile enters a low-load state and outputs for a period of time, the fuel cell enters a performance reduction state, and the output current is increased for a short time by using the controller at the moment, so that the electric pile can be ensured not to work in a low-performance working range for a long time by circulating; the control method is used for increasing the circulation multiplying power of the automobile to the cooling system so as to reduce the temperature of the fuel cell and enable the actual driving power of the fuel cell to the automobile to be stable.
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| CN202010403003.5A CN111546946B (en) | 2020-05-13 | 2020-05-13 | Method for improving working characteristics of fuel cell under light load |
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| CN202010403003.5A CN111546946B (en) | 2020-05-13 | 2020-05-13 | Method for improving working characteristics of fuel cell under light load |
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| CN111546946B true CN111546946B (en) | 2023-09-22 |
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| CN113654233A (en) * | 2021-06-29 | 2021-11-16 | 电子科技大学 | Combined system and method of fuel cell and air energy water heater |
| CN114744245A (en) * | 2022-03-17 | 2022-07-12 | 北京国家新能源汽车技术创新中心有限公司 | Modularized fuel cell system and vehicle |
| CN114937795B (en) * | 2022-04-28 | 2024-03-12 | 清华大学 | Method for widening working range of solid oxide fuel cell system |
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| CN110936855A (en) * | 2019-11-27 | 2020-03-31 | 中国第一汽车股份有限公司 | Dual-energy-source system and fuel cell assembly power-on control method |
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Denomination of invention: A method to improve the operating characteristics of fuel cells under light loads Granted publication date: 20230922 Pledgee: Shanghai Bank Co.,Ltd. Fengxian Branch Pledgor: Shanghai yihydrogen Technology Co.,Ltd. Registration number: Y2024980014943 |
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