CN113178598B - Auxiliary start-stop device and start-stop method for oxyhydrogen fuel cell activation test - Google Patents

Auxiliary start-stop device and start-stop method for oxyhydrogen fuel cell activation test Download PDF

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CN113178598B
CN113178598B CN202110386531.9A CN202110386531A CN113178598B CN 113178598 B CN113178598 B CN 113178598B CN 202110386531 A CN202110386531 A CN 202110386531A CN 113178598 B CN113178598 B CN 113178598B
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fuel cell
cell stack
gas
auxiliary
cathode
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CN113178598A (en
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花仕洋
吴昊
叶东浩
李柯
张海波
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Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Wuhan Hydrogen Energy and Fuel Cell Industry Technology Research Institute Co Ltd
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Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Wuhan Hydrogen Energy and Fuel Cell Industry Technology Research Institute Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective 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
    • H01M8/043—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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

Abstract

The invention relates to an auxiliary start-stop device for an oxyhydrogen fuel cell activation test, which comprises two groups of auxiliary pipelines, wherein each group of auxiliary pipelines comprises a main pipeline and a branch pipeline which are arranged in parallel, the main pipeline comprises a main pipeline which is provided with a vacuum pump and a first one-way valve in series, the branch pipelines comprise branch pipelines which are provided with second one-way valves, the flowing directions of the first one-way valves and the second one-way valves are consistent, and the air inlet ends in the flowing directions of the two groups of auxiliary pipelines are respectively used for being connected to a cathode outlet and an anode outlet of a fuel cell stack; meanwhile, the use amount of reaction gas is greatly reduced, and the test cost is reduced; the invention reduces the damage risk of the high potential to the electrode of the pile after long-time residence, and simultaneously provides a start-stop method for the activation test of the hydrogen-oxygen fuel cell.

Description

Auxiliary start-stop device and start-stop method for oxyhydrogen fuel cell activation test
Technical Field
The invention relates to the technical field of proton exchange membrane fuel cells, in particular to an auxiliary start-stop device and a start-stop method for an activation test of an oxyhydrogen fuel cell.
Background
Proton exchange membrane fuel cells have been widely used in the fields of transportation vehicles, buses, ships, underwater vehicles, spacecraft, and the like. Compared with other electric energy source type technologies, the proton exchange membrane fuel cell has many advantages, including short start-up time, small system volume, low pollutant discharge, relatively high system efficiency, low noise level, and the like, and is an important potential new energy development direction in the 21 st century.
With the large scale application of proton exchange membrane fuel cells in the market, more and more fuel cell stacks are produced by manufacturers. Generally speaking, each newly assembled fuel cell stack needs to be subjected to an activation test process to ensure that the stack can fully exert performance while checking the normal use of the stack, so that a stack manufacturer is required to have enough stack test equipment. For the fuel cell for the vehicle, some working conditions, such as start-stop working conditions, are inevitably experienced during the activation test of the electric pile. Under the start-stop working condition, the oxidation of the catalyst carrier carbon material is considered to be an important factor causing the performance degradation of the battery, the root cause is that the cathode forms high potential due to the existence of an anode hydrogen/oxygen interface in the starting and stopping processes, and the frequent start-stop of the electric pile testing process increases the time at the high potential. Particularly, in the traditional activation testing process, in order to ensure that the anode cavity of the galvanic pile is fully filled with hydrogen, a long-time hydrogen replacement purging process is carried out in the starting stage; on the other hand, in order to ensure that the cell stack discharges the oxidizing agent and the reducing agent in the cell stack after shutdown to reduce the voltage of the cell, a long inert gas purging process is required in the shutdown stage. This operation therefore wastes a large amount of test gas, while increasing the residence time of the cell at high potential, which is neither economical nor detrimental to the durability of the cell.
Disclosure of Invention
In view of this, it is necessary to provide an auxiliary start-stop device for an oxyhydrogen fuel cell activation test, so as to solve the technical problems in the prior art that the test gas is seriously wasted and the durability of the cell is damaged under the start-stop working condition during the stack activation test.
The invention provides an auxiliary start-stop device for an oxyhydrogen fuel cell activation test, which comprises two groups of auxiliary pipelines, wherein each group of auxiliary pipelines comprises a main pipeline and a branch pipeline which are arranged in parallel, the main pipeline comprises a main pipeline which is provided with a vacuum pump and a first one-way valve in series, the branch pipeline comprises a branch pipeline which is provided with a second one-way valve, the flow directions of the first one-way valve and the second one-way valve are consistent, and the air inlet ends of the two groups of auxiliary pipelines in the flow direction are respectively used for being connected to a cathode outlet and an anode outlet of a fuel cell stack.
Furthermore, a pressure sensor is installed at the air inlet end of each auxiliary pipeline.
The gas inlet and the gas outlet in the circulation direction of each auxiliary pipeline are respectively connected with the corresponding gas inlet and the corresponding gas outlet.
The touch screen is characterized by further comprising a touch screen, a power supply and a control system, wherein the power supply is electrically connected with the control system, the control system is respectively electrically connected with the first one-way valve, the second one-way valve, the touch screen, the two vacuum pumps and the two pressure sensors, the control system monitors the pressure difference between two sides according to the pressure sensors and controls the two vacuum pumps to be opened or closed according to the pressure difference, and the touch screen controls the first one-way valve and the second one-way valve to be opened or closed through the control system.
The invention also provides a start-stop method for the activation test of the hydrogen-oxygen fuel cell, which comprises the following steps:
s1, connecting the fuel cell stack and the auxiliary start-stop device as claimed in any one of claims 1 to 4 to an activation test line, wherein the air inlet ends of the two groups of auxiliary pipelines in the flowing direction are respectively used for being connected to the cathode outlet and the anode outlet of the fuel cell stack, so that good air tightness is ensured;
s2, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell when the first one-way valve is opened;
s3, opening the second one-way valve and closing the first one-way valve, and connecting a load for an activation test;
S4, disconnecting the load after the activation test is finished;
s5, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell during closing;
wherein the fuel cell internal gas replacement at start-up comprises:
s21, purging the fuel cell stack by adopting inert gas;
s22, vacuumizing the fuel cell stack through a main pipeline;
s23, introducing reaction gas into the fuel cell stack to break vacuum of the fuel cell stack;
the fuel cell internal gas replacement at shutdown includes:
s51, vacuumizing the fuel cell stack through a main pipeline;
and S52, purging inert gas into the fuel cell stack.
Further, in the step S21, purging the fuel cell stack with the inert gas is specifically performed by purging the inert gas into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack, respectively, where the purging time is not less than 1 min.
Further, in step S22, the step of evacuating the fuel cell stack specifically includes evacuating a cathode chamber and an anode chamber through a cathode outlet and an anode outlet of the fuel cell stack, respectively, and during the evacuation, a pressure difference between the cathode outlet and the anode outlet does not exceed 20 kPa.
Further, in step S23, the step of introducing the reactant gas into the fuel cell stack is to introduce oxygen and hydrogen into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack, respectively, and maintain the pressure of the cathode chamber and the pressure of the anode chamber at 0 to 30 kPa.
Further, step S51 of evacuating the fuel cell stack specifically includes evacuating a cathode chamber and an anode chamber through a cathode outlet and an anode outlet of the fuel cell stack, respectively, where a pressure difference between the cathode outlet and the anode outlet does not exceed 20kPa during evacuation.
Further, the step S52 purging inert gas into the fuel cell stack specifically includes respectively introducing inert gas into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack, and maintaining the pressure of the cathode chamber and the pressure of the anode chamber at 0 to 30 kPa.
The start-stop method for the activation test of the hydrogen-oxygen fuel cell can greatly shorten the time of the start-up stage and the stop stage, and improve the test efficiency and the utilization rate of equipment; meanwhile, the use amount of reaction gas is greatly reduced, and the test cost is reduced; the invention also provides an auxiliary start-stop device for the activation test of the oxyhydrogen fuel cell, which can assist in implementing the method.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a clear understanding of the technical features of the present invention.
Drawings
Fig. 1 is a schematic diagram of an internal structure of an auxiliary start-stop device for an activation test of an oxyhydrogen fuel cell according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an external structure according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a connection relationship in use according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Example one
As shown in fig. 1 and fig. 2, the present embodiment provides an auxiliary start/stop device for an oxyhydrogen fuel cell activation test, which includes two sets of auxiliary pipelines, each set of auxiliary pipeline includes a main pipeline 11 and a branch pipeline 12 that are arranged in parallel, the main pipeline 11 includes a main pipeline 113 that is provided with a vacuum pump 111 and a first check valve 112 in series, the branch pipeline 12 includes a branch pipeline 121 that is provided with a second check valve 122, the flow directions of the first check valve 112 and the second check valve 122 are the same, and the air inlet ends in the flow direction of the two sets of auxiliary pipelines are respectively used for being connected to the cathode outlet and the anode outlet of the fuel cell stack 20.
When the auxiliary starting and stopping are carried out, the two second one-way valves 122 on the two auxiliary pipelines are closed, the first one-way valve 112 is opened, the two vacuum pumps 111 are started, the fuel cell stack 20 can be effectively vacuumized, and the pumped gas flows out from the main pipeline 113; when the activation test is performed, the first check valve 112 is closed, the second check valve 122 is opened, and the excess reaction gas passing through the cathode outlet and the anode outlet of the fuel cell stack 20 flows out of the branch pipe 121.
In order to detect the air pressure on the corresponding pipeline, a pressure sensor 13 is installed at the air inlet end of each auxiliary pipeline.
In the preferred embodiment of this application, this supplementary start-stop device still includes box 2, and two gas inlet 21 have been seted up side by side to one side of box 2, and the other side of box has been seted up side by side with the gas outlet 22 that two gas inlet 21 correspond, and two sets of auxiliary pipelines are installed in box 2 side by side, and the inlet end and the end of giving vent to anger on each auxiliary pipeline circulation direction are connected corresponding gas inlet 21 and gas outlet 22 respectively.
In order to control the auxiliary start-stop device, the embodiment further includes a touch screen 3, a power supply 4 and a control system 5, the power supply 4 is electrically connected with the control system 5, the control system 5 is electrically connected with the first one-way valve 112, the second one-way valve 122, the touch screen 3, the two vacuum pumps 111 and the two pressure sensors 13 respectively, the control system 5 monitors a pressure difference between two sides according to the pressure sensors 13 and controls the opening or closing of the two vacuum pumps 111 according to the pressure difference, and the touch screen 3 controls the opening or closing of the first one-way valve 112 and the second one-way valve 122 through the control system 5.
The use of this embodiment is described in conjunction with the description of figure 3,
firstly, the fuel cell stack 20 and the auxiliary start-stop device are connected according to the diagram shown in fig. 3, so that good air tightness and no air leakage are ensured; then, performing a gas replacement process in the fuel cell during one-time opening, namely opening a nitrogen valve N, and performing nitrogen purging on a cathode chamber and an anode chamber of the fuel cell stack 20 for 1 min; then closing two second one-way valves 122 on the two auxiliary pipelines, opening a first one-way valve 112, starting two vacuum pumps 111, vacuumizing a cathode chamber and an anode chamber of the fuel cell stack 20, simultaneously ensuring that the pressure difference between the positive side and the negative side is controlled within 20kPa, and stopping vacuumizing when reaching a vacuum degree of-90 kPa; respectively inching and opening a hydrogen inlet valve H and an oxygen inlet valve O to break the vacuum state of the cathode chamber and the anode chamber, keeping the pressure of 0-30kpa (gauge pressure), and closing the hydrogen inlet valve H and the oxygen inlet valve O; then, the second-time on-start gas replacement process is performed, then the first check valve 112 is closed, the second check valve 122 is opened, and the load can be connected for the activation test, and after the activation test is completed, the load is disconnected.
Then, the second check valve 122 is closed, the first check valve 112 is opened, and the gas replacement process inside the fuel cell during one closing is performed; starting two vacuum pumps 111, vacuumizing a cathode chamber and an anode chamber of the fuel cell stack 20, simultaneously ensuring that the pressure difference between the anode side and the cathode side is controlled within 20kPa, and stopping vacuumizing when the vacuum degree reaches-90 kPa; then, the nitrogen valve N is turned on in a inching mode to break the vacuum state of the cathode chamber and the anode chamber, the pressure is kept at 0-30kpa, and the nitrogen purging valve is closed; when the fuel cell is closed for the second time, the gas in the fuel cell is replaced, at the moment, the voltage of the single cell of the galvanic pile can be rapidly changed from high potential to low potential, and the inside of the galvanic pile is filled with inert nitrogen to form a shutdown protection state and can be transferred into a warehouse for storage.
When the auxiliary start-stop device is used in the activation test of the fuel cell stack 20, the start-stop work is realized in an auxiliary manner, the time of a start-up stage and a stop stage can be greatly shortened, and the test efficiency and the utilization rate of equipment are improved; meanwhile, the use amount of reaction gas is greatly reduced, and the test cost is reduced; reduces the damage risk of the high potential staying for a long time on the electrode of the pile,
example two
The embodiment provides a start-stop method for an activation test of an oxyhydrogen fuel cell, which comprises the following steps:
S1, connecting the fuel cell stack and the auxiliary start-stop device to an activation test circuit, wherein the air inlet ends of the two groups of auxiliary pipelines in the flowing direction are respectively used for being connected to the cathode outlet and the anode outlet of the fuel cell stack, so that good air tightness is ensured;
s2, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell when the first one-way valve is opened;
s21, purging the fuel cell stack by inert gas;
s22, vacuumizing the fuel cell stack through a main pipeline;
s23, introducing reaction gas into the fuel cell stack to break vacuum of the fuel cell stack;
wherein the fuel cell internal gas replacement at start-up comprises:
s21, purging the fuel cell stack by inert gas; specifically, inert gas is respectively purged into a cathode cavity and an anode cavity through a cathode inlet and an anode inlet of the fuel cell stack, the purging time is not less than 1min, and in the embodiment of the application, the inert gas refers to nitrogen under the condition that no specific description is given.
S22, vacuumizing the fuel cell stack through a main pipeline; specifically, a cathode chamber and an anode chamber are respectively vacuumized through a cathode outlet and an anode outlet of the fuel cell stack, and the pressure difference between the cathode outlet and the anode outlet does not exceed 20kPa in the vacuumization process.
S23, introducing reaction gas into the fuel cell stack to break vacuum of the fuel cell stack; specifically, oxygen and hydrogen are respectively introduced into a cathode chamber and an anode chamber through a cathode inlet and an anode inlet of a fuel cell stack, and the pressure of the cathode chamber and the pressure of the anode chamber are maintained at 0-30 kPa.
It can be understood that, the inside gaseous content of the inside reaction gas of fuel cell stack that the inside gaseous process of replacing of fuel cell can effectual improvement when once opening, therefore during actual operation, tester can be according to actual conditions independently select the inside gaseous number of times of replacing of fuel cell when opening to guarantee that the inside reaction gas of fuel cell stack has enough purity, in the embodiment of this application, the inside gaseous number of times of replacing of fuel cell is twice when opening.
S3, opening the second one-way valve and closing the first one-way valve, and connecting a load for an activation test;
s4, disconnecting the load after the activation test is finished;
s5, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell when the valve is closed;
wherein the fuel cell internal gas replacement at shutdown comprises:
s51, vacuumizing the fuel cell stack through the main pipeline; specifically, a cathode chamber and an anode chamber are respectively vacuumized through a cathode outlet and an anode outlet of the fuel cell stack, and the pressure difference between the cathode outlet and the anode outlet does not exceed 20kPa in the vacuumization process.
S52, purging inert gas into the fuel cell stack, specifically, respectively introducing the inert gas into a cathode chamber and an anode chamber through a cathode inlet and an anode inlet of the fuel cell stack, and keeping the pressure of the cathode chamber and the pressure of the anode chamber at 0-30 kPa.
In some embodiments of the present application, since the vacuum degree standard during vacuum pumping varies from experiment to experiment, and since the vacuum pumping speed is fast at a lower vacuum degree, but as the vacuum degree becomes higher, the vacuum pumping time increases in a geometric level, in order to take into account the time cost and the vacuum degree standard, the vacuum degree standard during vacuum pumping is set to-90 kPa, that is, when the vacuum degree of the cathode chamber or the anode chamber reaches-90 kPa, the vacuum pumping of the corresponding chamber is stopped.
Preferably, in the embodiment of the application, it should be ensured that the pressure difference between the cathode outlet and the anode outlet does not exceed 20kPa during the vacuum pumping process, so that the stability of the membrane electrode between the bipolar plates of the stack can be effectively protected, in the specific implementation, the pressure difference between the two sides is monitored in real time through a pressure sensor or a pressure gauge, and when the pressure difference is greater than 20kPa, the vacuum pump corresponding to the side with the higher vacuum degree is closed until the pressure difference between the two sides returns to within 20 kPa.
It can be understood that, the process of the internal gas replacement of the fuel cell can effectively reduce the content of the internal reaction gas of the fuel cell stack when the fuel cell stack is closed once, so that in the practical operation, a tester can autonomously select the number of times of the internal gas replacement of the fuel cell stack when the fuel cell stack is closed according to the practical situation to ensure that the internal reaction gas of the fuel cell stack is small enough, and in the embodiment of the application, the number of times of the internal gas replacement of the fuel cell stack is twice when the fuel cell stack is opened.
The method has the following action principle: purging the fuel cell with inert gas to fill the fuel cell stack with inert gas, vacuumizing to reduce the pressure in the fuel cell stack, introducing reaction gas into the fuel cell stack, can well replace the gas in the fuel cell stack, improve the content of the reaction gas in the fuel cell stack, effectively reduce the problem of hydrogen waste caused by the continuous introduction of the reaction gas, after the activation test is finished, the reaction gas in the fuel cell stack is replaced by inert gas in a mode of vacuumizing firstly and then breaking the vacuum, the single-chip voltage of the electric pile can be quickly changed from high potential to low potential, and the electric pile is filled with inert nitrogen gas at the moment, so that the shutdown protection state is realized, the start-stop method of the activation test of the hydrogen-oxygen fuel cell provided by the invention, the time of a starting stage and a stopping stage can be greatly shortened, and the testing efficiency and the utilization rate of equipment are improved; meanwhile, the use amount of reaction gas is greatly reduced, and the test cost is reduced; and the risk of damage to the pile electrode caused by long-time high potential residence is reduced.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (10)

1. The utility model provides an supplementary device that stops that opens of oxyhydrogen fuel cell activation test, its characterized in that includes two sets of auxiliary line, every group the auxiliary line is including parallelly connected main line and the branch pipeline that sets up, the main line is including the trunk line that is provided with vacuum pump and first check valve in series, branch pipeline is including the branch pipeline of installing the second check valve, first check valve with the flow direction of second check valve is unanimous, and the ascending inlet end in flow direction of two sets of auxiliary line is used for being connected to the cathode outlet and the positive pole export of fuel cell pile respectively.
2. The auxiliary start-stop device for the activation test of the hydrogen-oxygen fuel cell according to claim 1, wherein a pressure sensor is installed at the air inlet end of each auxiliary pipeline.
3. The auxiliary start-stop device for the activation test of the hydrogen-oxygen fuel cell according to claim 2, further comprising a box body, wherein two gas inlets are formed in one side of the box body in parallel, gas outlets corresponding to the two gas inlets are formed in the other side of the box body in parallel, two groups of auxiliary pipelines are arranged in the box body in parallel, and a gas inlet end and a gas outlet end of each auxiliary pipeline in the flowing direction are respectively connected with the corresponding gas inlet and gas outlet.
4. The auxiliary start-stop device for the activation test of the hydrogen-oxygen fuel cell according to claim 3, further comprising a touch screen, a power supply and a control system, wherein the power supply is electrically connected with the control system, the control system is electrically connected with the first one-way valve, the second one-way valve, the touch screen, the two vacuum pumps and the two pressure sensors respectively, the control system monitors the pressure difference between two sides according to the pressure sensors and controls the two vacuum pumps to be opened or closed according to the pressure difference, and the touch screen controls the first one-way valve and the second one-way valve to be opened or closed through the control system.
5. A start-stop method for an activation test of an oxyhydrogen fuel cell is characterized by comprising the following steps:
s1, connecting the fuel cell stack and the auxiliary start-stop device as claimed in any one of claims 1 to 4 to an activation test line, wherein the air inlet ends of the two groups of auxiliary pipelines in the flowing direction are respectively used for being connected to the cathode outlet and the anode outlet of the fuel cell stack, so that good air tightness is ensured;
s2, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell when the first one-way valve is opened;
S3, opening the second one-way valve and closing the first one-way valve, and connecting a load for an activation test;
s4, disconnecting the load after the activation test is finished;
s5, opening the first one-way valve and closing the second one-way valve, and replacing the gas in the fuel cell when the valve is closed;
wherein the fuel cell internal gas replacement at start-up comprises:
s21, purging the fuel cell stack by inert gas;
s22, vacuumizing the fuel cell stack through a main pipeline;
s23, introducing reaction gas into the fuel cell stack to break vacuum of the fuel cell stack;
the fuel cell internal gas replacement at shutdown includes:
s51, vacuumizing the fuel cell stack through a main pipeline;
and S52, purging inert gas into the fuel cell stack.
6. The start-stop method for the activation test of the hydrogen-oxygen fuel cell according to claim 5, wherein in the step S21, the inert gas is used for purging the fuel cell stack, specifically, the inert gas is purged into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack respectively, and the purging time is not less than 1 min.
7. The start-stop method for the activation test of the hydrogen-oxygen fuel cell according to claim 5, wherein the step S22 of evacuating the fuel cell stack is to evacuate the cathode chamber and the anode chamber through the cathode outlet and the anode outlet of the fuel cell stack, respectively, and during the evacuation, the pressure difference between the cathode outlet and the anode outlet does not exceed 20 kPa.
8. The start-stop method for the activation test of the hydrogen-oxygen fuel cell according to claim 5, wherein in step S23, the step of introducing the reaction gas into the fuel cell stack is to introduce oxygen and hydrogen into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack, respectively, and to maintain the pressure of the cathode chamber and the anode chamber at 0 to 30 kPa.
9. The start-stop method for the activation test of the hydrogen-oxygen fuel cell according to claim 5, wherein the step S51 is to evacuate the fuel cell stack, specifically to evacuate the cathode chamber and the anode chamber through the cathode outlet and the anode outlet of the fuel cell stack, respectively, and during evacuation, the pressure difference between the cathode outlet and the anode outlet does not exceed 20 kPa.
10. The start-stop method for the activation test of the hydrogen-oxygen fuel cell according to claim 5, wherein the step S52 is to purge the inert gas into the fuel cell stack, specifically to introduce the inert gas into the cathode chamber and the anode chamber through the cathode inlet and the anode inlet of the fuel cell stack, respectively, and to maintain the pressure of the cathode chamber and the anode chamber at 0 to 30 kPa.
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