CN104577165A - Stop control device and method of proton-exchange-membrane fuel cells - Google Patents
Stop control device and method of proton-exchange-membrane fuel cells Download PDFInfo
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- CN104577165A CN104577165A CN201510040866.XA CN201510040866A CN104577165A CN 104577165 A CN104577165 A CN 104577165A CN 201510040866 A CN201510040866 A CN 201510040866A CN 104577165 A CN104577165 A CN 104577165A
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04701—Temperature
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04701—Temperature
- H01M8/04708—Temperature of fuel cell reactants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a stop control device and a stop control method of proton-exchange-membrane fuel cells. The method comprises the following steps: carrying out independent discharging on all single cells in an electric pile, connecting a control switch, a crystal diode and a variable stop resistor in series and in parallel on each discharging circuit to the two ends of cathodes and anodes of all single cells; for stop control, adopting first closing for a hydrogen feeding valve, simultaneously adopting a fan to supply oxygen and dissipate heat for the electric pile continuously till the temperature of the electric pile descends to the optimal working temperature when in no load of the fuel cells; and when the electric pile is stopped, carrying out anode exhausting instantaneously. The stop control device and the stop control method disclosed by the invention have the advantages that the maintaining time of the electric pile at an open-circuit high voltage after the fuel-cell system is stopped can be shortened, and the occurrence of the reverse electrode phenomena of the single cell is inhibited; after stop, the fan runs to supply air to the electric pile, so that the speed of reaction is accelerated and the degradation of proton exchange membranes is slowed; and after stop, the exhausting is carried out instantaneously, and the impact of rapid increase of the hydrogen pressure on the proton exchange membranes when the electric pile is stopped instantaneously can be weakened.
Description
Technical field
The invention belongs to Proton Exchange Membrane Fuel Cells field, particularly relate to proton exchanging film fuel battery stop control apparatus and a method.
Background technology
Proton Exchange Membrane Fuel Cells is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) by electrochemical reaction, the chemical energy of reactive material being converted to electric energy, due to the advantage such as its energy conversion efficiency is high, environmental friendliness, power density and energy density are higher and power bracket is wide, be considered to clean, the generation technology efficiently of 21 century first-selection, be subject to the attention of national governments and major company.Along with going deep into of research, Proton Exchange Membrane Fuel Cells has a wide range of applications in fields such as Portable power source, distributed power station and underwater robots.Proton Exchange Membrane Fuel Cells, because current density is high, structure simple, does not have the seepage of electrolyte, and has the advantages such as toggle speed is fast, working temperature is low, be applicable to compact power and means of transportation in running.But the durability of Proton Exchange Membrane Fuel Cells and life-span are the key factors of its commercialized development of restriction always.On-vehicle fuel inevitably will experience the operating mode of frequent start-stop, and therefore, in fuel cell stopping process, the attenuation problem of battery performance is more outstanding.
After causing PEMFC to experience frequent start-stop circulation, the basic reason of performance degradation is the hydrogen/air interface and negative electrode high potential that are formed due to reverse current after fuel cell is shut down.At fuel cell stop moment; fuel cell is in open-circuit condition, owing to remaining hydrogen in anode flow channel, pile can be forced to be in open circuit voltage conditions for a long time; this easily causes catalyst carbon support generation oxide etch, causes cell performance decay and the lost of life etc.As can be seen here, the hydrogen that after accelerating consumption PEMFC system-down, anode remains and high-tension time of opening a way after shortening shutdown are the key factors improving fuel battery service life.
For this reason, domestic and international scientist has carried out large quantifier elimination, and these researchs mainly concentrate on the improvement of catalyst carrier material and system control strategy improves two aspects.Wherein utilizing the stronger catalyst carrier material of resistance to corrosion to substitute traditional carbon carrier is a kind of important solution.Yu etc. report and utilize graphited material with carbon element to carry out alternative traditional carbon carrier, and after fuel cell can be made to experience 1000 start and stop circulation, Performance data rate of decay reduces 5 times.But the high cost of these materials but hinders the commercialized development of fuel cell greatly.Therefore, with regard to the development form of current catalyst carrier material, system control strategy is the more real solution that can apply in natural fuel battery system.Wherein current system control strategy mainly contains: adopt gas purging anode in (1) stopping process; (2) outside gas circulation is used as purge gas; (3) assistant load use thus consume and remain in the gas of inside battery.Gas purging is a kind of very effective way, can prevent pile anodic formation hydrogen-empty interface, equally also can reduce the time that hydrogen-empty interface is present in anode, but purge gas is not easy to obtain in the actual motion of Proton Exchange Membrane Fuel Cells.Although gas purging can make PEMFC hydrogen-empty interface in stopping process be difficult to be present in pile anode in addition, but fuel cell to remain in after shutting down in the flow field in and gas diffusion layers is interior and gas in Catalytic Layer, and is not easy to be discharged.Therefore, another effectively consumes that to remain in the method for the gas in gas diffusion layers and Catalytic Layer be utilize assistant load in the flow field in.Jae Hong Kim etc. have studied the existence of assistant load whether to the material impact of performance degradation speed after fuel cell experience frequent start-stop.Their result of study shows to utilize assistant load can reduce the decay of performance and the reduction of electrochemical surface area in PEMFC stopping process largely.Except above-mentioned solution, other method is also applied in fuel cell stopping process, they comprise catalyst structure design optimization, utilize the fuel inlet design of notch cuttype thus optimize the distribution etc. of fuel battery inside gas.But by contrast, utilize assistant load to be relatively simple and cheap, and more can be applied to the control strategy in fuel cell system.But because the gas concentration remaining in inner each of pile after fuel cell shutdown is different, result in the speed that every a slice monomer battery voltage declines when using assistant load electric discharge also inconsistent.But, assistant load is applied on whole fuel cell pile unactual, causes the generation of battery reverse electrode phenomena because of the decline of some sheet monomer battery voltage can be caused too fast.Therefore, research and develop out a kind of reliable and practical stop control apparatus and become fuel cell shutdown control strategy technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of the embodiment of the present invention is to provide proton exchanging film fuel battery stop control apparatus and a method; after being intended to shorten fuel cell system shutdown, pile maintains the open circuit high-tension time; suppress the generation of cell reverse electrode phenomena, improve the life-span of fuel cell.
The present invention is achieved in that a proton exchanging film fuel battery stop control apparatus comprises hydrogen container, pressure-reducing valve, voltage stabilizing ball valve, hydrogen gas electromagnetically operated valve, main load control switch, main load, anode vent valve, crystal diode, shutdown resistance, control switch, end plate, insulation board, electrode, cell;
Hydrogen container, pressure-reducing valve, voltage stabilizing ball valve, hydrogen gas electromagnetically operated valve, end plate, insulation board connect successively, electrode is arranged between end plate and insulation board, cell is arranged between the insulation board at two ends, the end plate connection of anode vent valve and anode side, main load control switch and main load are connected with the electrode at two ends;
Embed in each cell and discharge circuit control device is installed; this discharge circuit control device is composed in series mutually by a control switch, a shutdown resistance and a crystal diode; each cell discharge circuit is connected in the anode and cathode two ends of cell in parallel; control switch controls incision or the disconnection of shutting down resistance, the conducting voltage of crystal diode restriction discharge circuit.
Further, the shutdown resistance adopted is purely resistive, shuts down resistance sizes and requires that ensureing that monomer battery voltage drops to 0.2V required time by open circuit voltage is between 15S to 30S.
Further, in pile, each cell discharges separately.
Further, in fuel cell manufacture process, discharge circuit control device is embedded in each cell.
Further, the conducting voltage of described crystal diode is 0.1V ~ 0.2V.
Further, this Proton Exchange Membrane Fuel Cells stop control apparatus does not arrange crystal diode.
Another object of the present invention is to provide a proton exchanging film fuel battery halt control method be:
Step one, open main auxiliary contactor to disconnect the connection of main load;
Step 2, closedown hydrogen gas electromagnetically operated valve;
Step 3, open anode vent valve, exhaust interval, evacuation time and exhaust number of times are set;
Step 4, pile fan remain in operation, until stack temperature drop to pile unloaded time optimum working temperature;
Step 5, close control switch, shuts down resistance and crystal diode, discharge to each cell in pile to connect;
Step 6, when monomer battery voltage in pile is lower than 0.1V or 0.2V, disconnect charge/discharge control circuit.
Advantage of the present invention is:
(1) use the hydrogen of shutting down and remaining in anode-side after the quick consume fuel battery system of resistance is shut down, limit the voltage after shutdown, shorten fuel cell downtime, and then reduce being corroded of cathode side catalyst carbon carrier.
(2) reacting gas concentration owing to remaining in every a slice cell after fuel cell shutdown is inconsistent; monomer battery voltage fall off rate is also different; and fuel cell is shut down each time; the fastest that sheet cell of voltage drop is not fixed; according to shutdown resistance to whole pile or to pile modular electric discharge, easily cause cell contrapolarization or discharge not thorough.The present invention adopts and discharges separately to each cell, and the electric discharge that cell can be made to shut down is more abundant, can consume the hydrogen remaining in anode-side after pile is shut down by high degree.
Adopt crystal diode to control cell electric discharge, the negative effect that cell antipole causes pile can be prevented.
(4) cell electric discharge device is integrated into a very little stop control apparatus and is just inlaid in fuel cell manufacture process in each cell by the present invention, and the complexity of fuel cell system can be made greatly to be reduced, more convenient to operate.
(5) after shutting down; close hydrogen gas valve and carry out anode exhaust immediately; pile stop moment can be weakened, the impact that the surge of Hydrogen Vapor Pressure causes proton exchange membrane, also can shorten Hydrogen Vapor Pressure after shutting down simultaneously and drop to from peak value the time that 0bar needs.
(6) directly shut down under fuel cell system large load current; its stack temperature can more than the maximum operation temperature under PEMFC idle condition; the degraded of too high stack temperature meeting accelerating proton exchange membrane; therefore; after shutting down, pile fan remains in operation; the speed that hydrogen reaction consumes can not only be accelerated, also can slow down the degraded of proton exchange membrane simultaneously to pile heat radiation.
Accompanying drawing explanation
Fig. 1 is the open proton exchange film fuel battery system overall structure figure of air-cooled negative electrode that the embodiment of the present invention provides;
Fig. 2 is the circuit diagram of the discharge circuit control device that the embodiment of the present invention provides;
In figure: 1-hydrogen container, 2-pressure-reducing valve, 3-voltage stabilizing ball valve, 4-hydrogen gas electromagnetically operated valve, the main load control switch of 5-, the main load of 6-, 7-anode vent valve, 8-crystal diode, 9-shuts down resistance, 10-control switch, 11-end plate, 12-insulation board, 13-electrode, 14-cell;
Fig. 3 is the Proton Exchange Membrane Fuel Cells halt control method flow chart that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, this present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain this present invention, be not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
Embodiment one
The open proton exchange film fuel battery system overall structure figure of air-cooled negative electrode as shown in Figure 1,
Hydrogen container 1, pressure-reducing valve 2, voltage stabilizing ball valve 3, hydrogen gas electromagnetically operated valve 4, end plate 11, insulation board 12 connect successively, electrode is arranged between end plate 11 and insulation board 12, cell 14 is arranged between the insulation board 12 at two ends, the end plate connection of anode vent valve 7 and anode side, main load control switch 5 and main load 6 are connected with the electrode 13 at two ends.
The open Proton Exchange Membrane Fuel Cells halt control method of air-cooled negative electrode embeds a discharge circuit control device as shown in Figure 2 in cell, and the cell that then these embedded in discharge circuit is assembled into pile.Two control signal wires shut down resistance incision or disconnection for controlling each cell is drawn in pile.
Described discharge circuit control device shuts down resistance 9 by a control switch 10, and a crystal diode 8 is composed in series mutually, each cell discharge circuit is connected in the anode and cathode two ends of cell 14 in parallel, control switch 10 controls incision or the disconnection of shutting down resistance 9, and crystal diode 8 limits the conducting voltage of discharge circuit; This Proton Exchange Membrane Fuel Cells stop control apparatus can not arrange crystal diode 8.
Further, the shutdown resistance 9 adopted is purely resistive, and it is between 15S to 30S that shutdown resistance 9 size requirements ensures that monomer battery voltage drops to 0.2V required time by open circuit voltage.
Further, in pile, each cell 14 discharges separately.
Further, in fuel cell manufacture process, discharge circuit control device is embedded in each cell.
Further, the conducting voltage of described crystal diode 8 is 0.1V ~ 0.2V.
The detailed process that the open Proton Exchange Membrane Fuel Cells of air-cooled negative electrode is shut down is as follows:
S101, open main auxiliary contactor to disconnect the connection of main load;
S102, closedown hydrogen gas electromagnetically operated valve;
S103, open anode vent valve, exhaust interval, evacuation time and exhaust number of times are set;
S104, pile fan remain in operation, until stack temperature drop to pile unloaded time optimum working temperature;
S105, close control switch, shuts down resistance and crystal diode, discharge to each cell in pile to connect;
S106, when monomer battery voltage in pile is lower than 0.1V or 0.2V, disconnect charge/discharge control circuit.
Advantage of the present invention is:
(1) use the hydrogen of shutting down and remaining in anode-side after the quick consume fuel battery system of resistance is shut down, limit the voltage after shutdown, shorten fuel cell downtime, and then reduce being corroded of cathode side catalyst carbon carrier.
(2) reacting gas concentration owing to remaining in every a slice cell after fuel cell shutdown is inconsistent; monomer battery voltage fall off rate is also different; and fuel cell is shut down each time; the fastest that sheet cell of voltage drop is not fixed; according to shutdown resistance to whole pile or to pile modular electric discharge, easily cause cell contrapolarization or discharge not thorough.The present invention adopts and discharges separately to each cell, and the electric discharge that cell can be made to shut down is more abundant, can consume the hydrogen remaining in anode-side after pile is shut down by high degree.
Adopt crystal diode to control cell electric discharge, the negative effect that cell antipole causes pile can be prevented.
(4) cell electric discharge device is integrated into a very little stop control apparatus and is just inlaid in fuel cell manufacture process in each cell by the present invention, and the complexity of fuel cell system can be made greatly to be reduced, more convenient to operate.
(5) after shutting down; close hydrogen gas valve and carry out anode exhaust immediately; pile stop moment can be weakened, the impact that the surge of Hydrogen Vapor Pressure causes proton exchange membrane, also can shorten Hydrogen Vapor Pressure after shutting down simultaneously and drop to from peak value the time that 0bar needs.
(6) directly shut down under fuel cell system large load current; its stack temperature can more than the maximum operation temperature under PEMFC idle condition; the degraded of too high stack temperature meeting accelerating proton exchange membrane; therefore; after shutting down, pile fan remains in operation; the speed that hydrogen reaction consumes can not only be accelerated, also can slow down the degraded of proton exchange membrane simultaneously to pile heat radiation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a proton exchanging film fuel battery stop control apparatus, it is characterized in that, described Proton Exchange Membrane Fuel Cells stop control apparatus comprises hydrogen container, pressure-reducing valve, voltage stabilizing ball valve, hydrogen gas electromagnetically operated valve, main load control switch, main load, anode vent valve, crystal diode, shutdown resistance, control switch, end plate, insulation board, electrode, cell;
Hydrogen container, pressure-reducing valve, voltage stabilizing ball valve, hydrogen gas electromagnetically operated valve, end plate, insulation board connect successively, electrode is arranged between end plate and insulation board, cell is arranged between the insulation board at two ends, the end plate connection of anode vent valve and anode side, main load control switch and main load are connected with the electrode at two ends;
Embed in each cell and discharge circuit control device is installed; this discharge circuit control device is composed in series mutually by a control switch, a shutdown resistance and a crystal diode; each cell discharge circuit is connected in the anode and cathode two ends of cell in parallel; control switch controls incision or the disconnection of shutting down resistance, the conducting voltage of crystal diode restriction discharge circuit.
2. Proton Exchange Membrane Fuel Cells stop control apparatus as claimed in claim 1, it is characterized in that, the shutdown resistance adopted is purely resistive, shuts down resistance sizes and requires that ensureing that monomer battery voltage drops to 0.2V required time by open circuit voltage is 15S-30S.
3. Proton Exchange Membrane Fuel Cells stop control apparatus as claimed in claim 1, it is characterized in that, in pile, each cell discharges separately.
4. Proton Exchange Membrane Fuel Cells stop control apparatus as claimed in claim 1, is characterized in that, embedded in each cell by discharge circuit control device in fuel cell manufacture process.
5. Proton Exchange Membrane Fuel Cells stop control apparatus as claimed in claim 1, is characterized in that, the conducting voltage of described crystal diode is 0.1V ~ 0.2V.
6. Proton Exchange Membrane Fuel Cells stop control apparatus as claimed in claim 1, it is characterized in that, this Proton Exchange Membrane Fuel Cells stop control apparatus does not arrange crystal diode.
7. a proton exchanging film fuel battery halt control method, is characterized in that, described Proton Exchange Membrane Fuel Cells control method is:
Step one, open main auxiliary contactor to disconnect the connection of main load;
Step 2, closedown hydrogen gas electromagnetically operated valve;
Step 3, open anode vent valve, exhaust interval, evacuation time and exhaust number of times are set;
Step 4, pile fan remain in operation, until stack temperature drop to pile unloaded time optimum working temperature;
Step 5, close control switch, shuts down resistance and crystal diode, discharge to each cell in pile to connect;
Step 6, when monomer battery voltage in pile is lower than 0.1V or 0.2V, disconnect charge/discharge control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510040866.XA CN104577165A (en) | 2015-01-27 | 2015-01-27 | Stop control device and method of proton-exchange-membrane fuel cells |
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| CN201510040866.XA CN104577165A (en) | 2015-01-27 | 2015-01-27 | Stop control device and method of proton-exchange-membrane fuel cells |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047965A (en) * | 2015-07-03 | 2015-11-11 | 西南交通大学 | Proton exchange membrane fuel cell (PEMFC) stack shutdown strategy considering voltage balance |
| CN106571479A (en) * | 2015-10-08 | 2017-04-19 | 北京亿华通科技股份有限公司 | Fuel cell system and shutdown control method thereof |
| CN106711479A (en) * | 2017-01-06 | 2017-05-24 | 东莞氢宇新能源科技有限公司 | Fuel cell start-stop protection and control method and system |
| CN107305955A (en) * | 2016-04-18 | 2017-10-31 | 现代自动车株式会社 | Apparatus and method for controlling fuel cell pack |
| CN107681180A (en) * | 2017-09-21 | 2018-02-09 | 电子科技大学 | A kind of device for fuel cell Detection ＆ Controling |
| CN108039504A (en) * | 2017-12-06 | 2018-05-15 | 浙江高成绿能科技有限公司 | One proton exchanging film fuel battery shutdown control system and method |
| CN109687000A (en) * | 2019-02-20 | 2019-04-26 | 河南豫氢动力有限公司 | A kind of fuel cell system shuts down electric discharge device and method |
| CN110071570A (en) * | 2018-01-24 | 2019-07-30 | 湖州师范学院 | A kind of elevator emergency power-supply system and control method based on fuel cell and super capacitor |
| CN112086668A (en) * | 2020-09-25 | 2020-12-15 | 南昌智能新能源汽车研究院 | Multiphase load changing method for starting and stopping fuel cell |
-
2015
- 2015-01-27 CN CN201510040866.XA patent/CN104577165A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047965B (en) * | 2015-07-03 | 2017-05-03 | 西南交通大学 | Proton exchange membrane fuel cell (PEMFC) stack shutdown strategy considering voltage balance |
| CN105047965A (en) * | 2015-07-03 | 2015-11-11 | 西南交通大学 | Proton exchange membrane fuel cell (PEMFC) stack shutdown strategy considering voltage balance |
| CN106571479A (en) * | 2015-10-08 | 2017-04-19 | 北京亿华通科技股份有限公司 | Fuel cell system and shutdown control method thereof |
| CN106571479B (en) * | 2015-10-08 | 2019-06-11 | 北京亿华通科技股份有限公司 | A kind of fuel cell system and its halt control method |
| CN107305955A (en) * | 2016-04-18 | 2017-10-31 | 现代自动车株式会社 | Apparatus and method for controlling fuel cell pack |
| CN107305955B (en) * | 2016-04-18 | 2021-02-05 | 现代自动车株式会社 | Apparatus and method for controlling fuel cell stack |
| CN106711479A (en) * | 2017-01-06 | 2017-05-24 | 东莞氢宇新能源科技有限公司 | Fuel cell start-stop protection and control method and system |
| CN107681180B (en) * | 2017-09-21 | 2020-03-24 | 电子科技大学 | Device for detecting and controlling fuel cell |
| CN107681180A (en) * | 2017-09-21 | 2018-02-09 | 电子科技大学 | A kind of device for fuel cell Detection ＆ Controling |
| CN108039504A (en) * | 2017-12-06 | 2018-05-15 | 浙江高成绿能科技有限公司 | One proton exchanging film fuel battery shutdown control system and method |
| CN108039504B (en) * | 2017-12-06 | 2020-06-26 | 浙江高成绿能科技有限公司 | Shutdown control system and method for proton exchange membrane fuel cell |
| CN110071570A (en) * | 2018-01-24 | 2019-07-30 | 湖州师范学院 | A kind of elevator emergency power-supply system and control method based on fuel cell and super capacitor |
| CN109687000A (en) * | 2019-02-20 | 2019-04-26 | 河南豫氢动力有限公司 | A kind of fuel cell system shuts down electric discharge device and method |
| CN109687000B (en) * | 2019-02-20 | 2023-11-03 | 河南豫氢动力有限公司 | Shutdown discharging device and method for fuel cell system |
| CN112086668A (en) * | 2020-09-25 | 2020-12-15 | 南昌智能新能源汽车研究院 | Multiphase load changing method for starting and stopping fuel cell |
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Application publication date: 20150429 |