CN114006012A - High-low temperature scouring test system and method for bipolar plate of fuel cell - Google Patents
High-low temperature scouring test system and method for bipolar plate of fuel cell Download PDFInfo
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- CN114006012A CN114006012A CN202111238365.4A CN202111238365A CN114006012A CN 114006012 A CN114006012 A CN 114006012A CN 202111238365 A CN202111238365 A CN 202111238365A CN 114006012 A CN114006012 A CN 114006012A
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- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 239000000446 fuel Substances 0.000 title claims abstract description 66
- 238000009991 scouring Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 230000002528 anti-freeze Effects 0.000 claims abstract description 51
- 238000007710 freezing Methods 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 12
- 238000003745 diagnosis Methods 0.000 abstract description 3
- 239000000498 cooling water Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04664—Failure or abnormal function
- H01M8/04679—Failure or abnormal function of fuel cell stacks
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0432—Temperature; Ambient temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
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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
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to the technical field of fuel cells, in particular to a high and low temperature scouring test system and a method for a bipolar plate of a fuel cell, wherein the test system tests the fuel cell through antifreeze; the test system comprises a low-temperature system, and the supply temperature of the anti-freezing solution in the test system is lower than-30 ℃; the high-temperature system enables the supply temperature of the anti-freezing solution in the test system to be higher than 80 ℃; the pipeline state monitoring and switching system is used for controlling the switching of the low-temperature system and the high-temperature system, and monitoring the temperature of the antifreeze liquid entering the fuel cell and the pressure of the antifreeze liquid entering and exiting the fuel cell; during testing, ultralow temperature and high temperature can be rapidly switched, the actual operation environment of the galvanic pile can be simulated, and after the galvanic pile is subjected to long-time anti-freezing fluid scouring, rapid diagnosis is used to explore the influence and the influence degree of the anti-freezing fluid scouring on the polar plate; simulating the actual operation environment of the galvanic pile, carrying out long-time anti-freezing fluid scouring on the galvanic pile, and exploring the influence and degree of the anti-freezing fluid scouring on the polar plate.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a high-low temperature scouring test system and a high-low temperature scouring test method for a bipolar plate of a fuel cell.
Background
As a new green power source, a fuel cell engine is becoming one of the important research and development points of vehicle-mounted engines due to its excellent characteristics such as high efficiency and low emission. The fuel cell engine is based on the output of a load, and has good controllability for the whole vehicle; meanwhile, the energy output of the fuel cell engine is electric energy, and the transmission and speed regulation structure of the traditional automobile is simplified. Although fuel cell engines have many advantages over internal combustion engines, fuel cell engines are the mainstream of automotive engines to replace internal combustion engines, and many problems need to be solved. The core component of the fuel cell engine is a fuel cell stack, and tests of the fuel cell stack have a large problem, after the stack runs for a long time, antifreeze liquid in the bipolar plate may leak, that is, the antifreeze liquid in the water cavity penetrates through the polar plate and permeates into an airflow field on the anode side or the cathode side, so that a flow channel of the airflow field is blocked, and an MEA (membrane electrode assembly) is polluted, thereby reducing the performance. At present, no good test equipment is available for solving the problem of high and low temperature scouring test of the bipolar plate, and the bipolar plate can meet the requirement of high and low temperature switching speed and has the functions of flow control and pressure control.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the fuel cell bipolar plate high and low temperature scouring test system and method can meet the requirement of high and low temperature switching speed and have flow control and pressure control functions.
In order to solve the technical problems, the invention adopts the technical scheme that:
a high and low temperature scouring test system for a bipolar plate of a fuel cell tests the fuel cell through an antifreeze solution;
the test system comprises
The low-temperature system enables the supply temperature of the anti-freezing solution in the test system to be lower than minus 30 ℃;
the high-temperature system enables the supply temperature of the anti-freezing solution in the test system to be higher than 80 ℃;
and the pipeline state monitoring and switching system controls the switching of the low-temperature system and the high-temperature system, and monitors the temperature of the antifreeze liquid entering the fuel cell and the pressure of the antifreeze liquid entering and exiting the fuel cell.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a high and low temperature scouring test method for a bipolar plate of a fuel cell,
before the test is started, preheating the antifreeze in the high-temperature system, reducing the antifreeze in the low-temperature system to reach a preset test temperature;
running a test, setting parameters, injecting nitrogen into the hot liquid tank and the cold liquid tank to realize back pressure, and providing the same pressure for the anode and the cathode of the fuel cell stack of the tested piece;
when the high-temperature operation is carried out, the angle seat valve communicated with the hot liquid tank is opened, the angle seat valve communicated with the cold liquid tank is closed, and the first pump drives the flow of the whole loop;
when the engine runs at a low temperature, an angle seat valve communicated with a cold liquid tank is opened, an angle seat valve communicated with a hot liquid tank is closed, a first pump drives the flow of the whole loop, and the rotating speed of the first pump is increased according to the actual flow;
and after the test is finished, diagnosing the galvanic pile, detecting the current leakage of hydrogen water and empty water, confirming the proportion of the abnormal polar plate, collecting graphite particles washed off in the anti-freezing solution by using filter paper, and weighing after drying.
The invention has the beneficial effects that: according to the invention, when the bipolar plate of the fuel cell stack is tested, ultralow temperature and high temperature can be rapidly switched, the actual operation environment (from a cold start state to a high temperature state) of the stack can be simulated, and after the stack is subjected to long-time anti-freezing fluid washing, the influence and the influence degree of the anti-freezing fluid washing on the bipolar plate are researched by using rapid diagnosis; the actual operation environment of the galvanic pile can be simulated, the galvanic pile is subjected to long-time anti-freezing fluid scouring, and the influence of the anti-freezing fluid scouring on the polar plate and the influence degree are researched; the flow coverage range is wide, and the test can be performed for 150-plus-300 kW long piles or 30-60kW short piles; the temperature coverage range is wide, the low temperature can realize the-50 ℃ scouring test under the condition that the environmental chamber meets the requirement, and the high temperature can realize the 95 ℃ scouring test; the cooling water system is optimized for the problem of large cooling water amount required by cooling and condensing high-temperature and high-humidity gas discharged at the tail end under high flow, so that the energy consumption is saved, and the requirements on equipment and laboratories for cooling water are greatly reduced.
Drawings
Fig. 1 is a block diagram of a high and low temperature scouring test system for a bipolar plate of a fuel cell according to an embodiment of the present invention;
fig. 2 is a flow rate variation graph of a fuel cell bipolar plate high and low temperature erosion test method according to an embodiment of the present invention;
fig. 3 is a temperature variation curve diagram during high temperature testing of a fuel cell bipolar plate high and low temperature scouring testing method according to an embodiment of the invention;
fig. 4 is a temperature variation curve diagram during low-temperature testing of a fuel cell bipolar plate high and low temperature scouring testing method according to an embodiment of the invention;
description of reference numerals: 1. an outlet pressure sensor; 2. a first pump; 3. a ball valve; 4. a first angle seat valve; 5. a second angle seat valve; 6. a first cold liquid tank; 7. a first temperature sensor; 8. a first cooling pump; 9. a first heat sink; 10. a second cold liquid tank; 11. a second temperature sensor; 12. a second cooling pump; 13. a second heat sink; 14. a third angle seat valve; 15. a back pressure regulating valve; 16. a hot liquid tank; 17. a third temperature sensor; 18. a heater; 19. a sixth seat valve; 20. a fourth corner seat valve; 21. a fifth angle seat valve; 22. a flow meter; 23. an inlet pressure sensor; 24. an inlet temperature sensor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 4, a fuel cell bipolar plate high and low temperature scouring test system tests a fuel cell by an antifreeze solution;
the test system comprises
The low-temperature system enables the supply temperature of the anti-freezing solution in the test system to be lower than minus 30 ℃;
the high-temperature system enables the supply temperature of the anti-freezing solution in the test system to be higher than 80 ℃;
and the pipeline state monitoring and switching system controls the switching of the low-temperature system and the high-temperature system, and monitors the temperature of the antifreeze liquid entering the fuel cell and the pressure of the antifreeze liquid entering and exiting the fuel cell.
Preferably, the fuel cell has an antifreeze inlet and an antifreeze outlet;
a first pump is arranged at an antifreeze liquid outlet of the fuel cell, and the first pump is respectively communicated with the low-temperature system and the high-temperature system and returns to an antifreeze liquid inlet;
and the pipeline state monitoring and switching system controls the work of the first pump.
Preferably, a ball valve is arranged at an outlet of the first pump, and an angle seat valve is arranged between the low-temperature system, the high-temperature system and the ball valve;
angle seat valves are arranged among the low-temperature system, the high-temperature system and the antifreeze liquid inlet;
the pipeline state monitoring and switching system controls the work of the ball valve and the angle seat valve.
Preferably, a flow meter, an inlet pressure sensor and an inlet temperature sensor are arranged at the antifreeze liquid inlet;
an outlet pressure sensor is arranged at the antifreeze liquid outlet;
the pipeline state monitoring and switching system acquires data of a flowmeter, an inlet pressure sensor, an inlet temperature sensor and an outlet pressure sensor.
Preferably, there are two groups of cryogenic systems;
the test system also comprises an environment bin, the temperature of the environment bin is lower than-30 ℃, and the two groups of low-temperature systems are positioned in the environment bin.
From the above description, with two sets of low temperature systems, because part of the high temperature antifreeze solution in the pipeline enters the low temperature system during each cold and hot switching, if the cold and hot switching is frequent, different low temperature systems are started during each two adjacent switching, so that each set of low temperature system has enough time to cool to the low temperature required by the user; through the low temperature in the environment storehouse, can guarantee low temperature system's heat preservation and quick heat dissipation cooling, guarantee that low temperature system's temperature is in the best test interval, overcome the slow problem of natural heat dissipation speed.
Preferably, the low-temperature system comprises a cold liquid tank, a cooling pump machine and a radiator, wherein the cold liquid tank is sequentially connected with the cooling pump machine and the radiator through pipelines and is connected back to the interior of the cold liquid tank;
the pipeline state monitoring and switching system controls the work of the cooling pump and the radiator.
Preferably, the high-temperature system comprises a hot liquid tank and a heater arranged in the hot liquid tank;
the pipeline state monitoring and switching system controls the operation of the heater.
Preferably, the test system further comprises a back pressure regulating valve, and the back pressure regulating valve is respectively communicated with the hot liquid tank and the cold liquid tank;
the pipeline state monitoring and switching system controls the work of the back pressure regulating valve.
A testing method of the fuel cell bipolar plate high and low temperature scouring testing system,
before the test is started, preheating the antifreeze in the high-temperature system, reducing the antifreeze in the low-temperature system to reach a preset test temperature;
running a test, setting parameters, injecting nitrogen into the hot liquid tank and the cold liquid tank to realize back pressure, and providing the same pressure for the anode and the cathode of the fuel cell stack of the tested piece;
when the high-temperature operation is carried out, the angle seat valve communicated with the hot liquid tank is opened, the angle seat valve communicated with the cold liquid tank is closed, and the first pump drives the flow of the whole loop;
when the engine runs at a low temperature, an angle seat valve communicated with a cold liquid tank is opened, an angle seat valve communicated with a hot liquid tank is closed, a first pump drives the flow of the whole loop, and the rotating speed of the first pump is increased according to the actual flow;
and after the test is finished, diagnosing the galvanic pile, detecting the current leakage of hydrogen water and empty water, confirming the proportion of the abnormal polar plate, collecting graphite particles washed off in the anti-freezing solution by using filter paper, and weighing after drying.
Preferably, the parameters comprise cycle time of high-low temperature cycle, total cycle number, pressure of the tested piece and flow rate of the tested piece.
From the above description, the beneficial effects of the present invention are: according to the invention, when the bipolar plate of the fuel cell stack is tested, ultralow temperature and high temperature can be rapidly switched, the actual operation environment (from a cold start state to a high temperature state) of the stack can be simulated, and after the stack is subjected to long-time anti-freezing fluid washing, the influence and the influence degree of the anti-freezing fluid washing on the bipolar plate are researched by using rapid diagnosis; the actual operation environment of the galvanic pile can be simulated, the galvanic pile is subjected to long-time anti-freezing fluid scouring, and the influence of the anti-freezing fluid scouring on the polar plate and the influence degree are researched; the flow coverage range is wide, and the test can be performed for 150-plus-300 kW long piles or 30-60kW short piles; the temperature coverage range is wide, the low temperature can realize the-50 ℃ scouring test under the condition that the environmental chamber meets the requirement, and the high temperature can realize the 95 ℃ scouring test; the cooling water system is optimized for the problem of large cooling water amount required by cooling and condensing high-temperature and high-humidity gas discharged at the tail end under high flow, so that the energy consumption is saved, and the requirements on equipment and laboratories for cooling water are greatly reduced.
Example one
A high and low temperature scouring test system for a bipolar plate of a fuel cell tests the fuel cell through an antifreeze solution;
the test system comprises
Two groups of low-temperature systems, wherein the supply temperature of the antifreeze in the test system is lower than minus 30 ℃;
the high-temperature system enables the supply temperature of the anti-freezing solution in the test system to be higher than 80 ℃;
and the pipeline state monitoring and switching system controls the switching of the low-temperature system and the high-temperature system, and monitors the temperature of the antifreeze liquid entering the fuel cell and the pressure of the antifreeze liquid entering and exiting the fuel cell.
The fuel cell is provided with an antifreeze liquid inlet and an antifreeze liquid outlet;
a first pump machine 2 is arranged at an antifreeze liquid outlet of the fuel cell, and the first pump machine 2 is respectively communicated with the low-temperature system and the high-temperature system and returns to an antifreeze liquid inlet;
the pipeline state monitoring and switching system controls the operation of the first pump 2.
A ball valve 3 is arranged at an outlet of the first pump machine 2, and an angle seat valve is arranged between the two groups of low-temperature systems and high-temperature systems and the ball valve 3; the angle seat valve corresponding to the first group of low-temperature systems is a first angle seat valve 4, the angle seat valve corresponding to the second group of low-temperature systems is a second angle seat valve 5, and the angle seat valve corresponding to the high-temperature systems is a third angle seat valve 14;
angle seat valves are arranged among the low-temperature system, the high-temperature system and the antifreeze liquid inlet; the angle seat valve corresponding to the first group of low-temperature systems is a fourth angle seat valve 20, the angle seat valve corresponding to the second group of low-temperature systems is a fifth angle seat valve 21, and the angle seat valve corresponding to the high-temperature systems is a sixth angle seat valve 19;
the pipeline state monitoring and switching system controls the work of the ball valve 3 and the angle seat valve.
A flow meter 22, an inlet pressure sensor 23 and an inlet temperature sensor 24 are arranged at the inlet of the anti-freezing liquid;
an outlet pressure sensor 1 is arranged at the antifreeze liquid outlet;
the pipeline condition monitoring switching system acquires data from the flow meter 22, the inlet pressure sensor 23, the inlet temperature sensor 24 and the outlet pressure sensor 1.
The test system also comprises an environment bin, the temperature of the environment bin is lower than-30 ℃, and the two groups of low-temperature systems are positioned in the environment bin.
The first group of low-temperature systems comprise a first cold liquid tank 6, a first cooling pump machine 8, a first radiator 9 and a first temperature sensor 7 (measuring range-50-100 ℃) arranged in the first cold liquid tank 6, and the cold liquid tank is sequentially connected with the first cooling pump machine 8 and the first radiator 9 through pipelines and connected back to the interior of the cold liquid tank;
the second group of low-temperature systems comprise a second cold liquid tank 10, a second cooling pump 12, a second radiator 13 and a second temperature sensor 11 (measuring range-50-100 ℃) arranged in the second cold liquid tank 10, and the cold liquid tank is sequentially connected with the second cooling pump 12 and the second radiator 13 through pipelines and is connected back to the interior of the cold liquid tank;
the pipeline state monitoring and switching system controls the work of the first cooling pump 8, the first radiator 9, the second cooling pump 12 and the second radiator 13.
The high-temperature system comprises a hot liquid tank 16, a heater 18 and a third temperature sensor 17 (the measuring range is 0-100 ℃) which are arranged in the hot liquid tank 16;
the line condition monitoring switching system controls the operation of the heater 18.
The testing system further comprises a back pressure regulating valve 15, and the back pressure regulating valve 15 is respectively communicated with the hot liquid tank 16, the first cold liquid tank 6 and the second cold liquid tank 10;
the pipeline state monitoring switching system controls the operation of the back pressure regulating valve 15.
The antifreeze among the components is circulated through the pipeline, and the pipeline is externally provided with heat insulation cotton for isolating the influence of the external environment on the whole system.
Example two
A testing method of the fuel cell bipolar plate high and low temperature scouring testing system according to the first embodiment,
before the test is started, preheating the antifreeze in the high-temperature system, reducing the antifreeze in the low-temperature system to reach a preset test temperature; the two groups of low-temperature systems are used for maintaining the supply temperature of the antifreeze in the test system at-35 ℃ (the first radiator and the second radiator are controlled to exchange heat with the environmental bin); a high temperature system to maintain the antifreeze supply temperature in the test system at 95 ℃ (heater control);
running tests, namely setting cycle time of high-low temperature circulation, total cycle number, pressure of a tested part (adjusted through a back pressure adjusting valve), flow of the tested part (set through flow meter feedback adjustment) and the like, injecting nitrogen into each water tank through an electric adjusting valve to realize water path back pressure, and providing the same pressure for the anode and the cathode of a fuel cell stack of the tested part to prevent the tested part from being damaged due to overlarge differential pressure of three cavities (a cold liquid box, a hot liquid box and the stack);
when the fuel cell stack is operated at a high temperature, the corner seat valves (a third corner seat valve and a sixth corner seat valve) communicated with the hot liquid tank are opened, the corner seat valves (a first corner seat valve, a second corner seat valve, a fourth corner seat valve and a fifth corner seat valve) communicated with the cold liquid tank are closed, the first pump drives the flow of the whole loop, and a tested part (the tested fuel cell stack) is in a high-temperature scouring state at the moment;
when the device runs at low temperature, the angle seat valves (the first angle seat valve, the second angle seat valve, the fourth angle seat valve and the fifth angle seat valve, which are communicated with the cold liquid tank, are opened in one group, and the angle seat valves (the third angle seat valve and the sixth angle seat valve) communicated with the hot liquid tank are closed;
and after the test is finished, diagnosing the galvanic pile, detecting the current leakage of hydrogen water and empty water, confirming the proportion of the abnormal polar plate, collecting graphite particles washed off in the anti-freezing solution by using filter paper, and weighing after drying.
By compiling upper computer software, obtaining an actual test curve (flow, temperature, pressure and the like) of a trial tested fuel cell stack, obtaining a partial operation experience curve according to actual working conditions when the trial tested fuel cell stack is tested, and describing a partial overshoot curve or an ascending/descending curve;
referring to fig. 2, the flow rate of the test is switched between 100LPM and 200LPM, and during low-temperature flushing, the viscosity of the antifreeze instantaneously changes, and a slight oscillation process occurs.
Referring to fig. 3, the temperature in the hot liquid tank in this test is 95 ℃, and when the low temperature flushing is switched to the high temperature flushing, the internal temperature is instantly reduced to 90 ℃, and then gradually and slowly increased to 95 ℃.
Referring to fig. 4, the temperature in the cold liquid box in the test is-35 ℃, when the high temperature washing is switched to the low temperature washing, the internal temperature is instantly increased to-30 ℃, and then gradually and slowly decreased to-35 ℃.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A high and low temperature scouring test system for a bipolar plate of a fuel cell is characterized in that the test system tests the fuel cell through an antifreeze solution;
the test system comprises
The low-temperature system enables the supply temperature of the anti-freezing solution in the test system to be lower than minus 30 ℃;
the high-temperature system enables the supply temperature of the anti-freezing solution in the test system to be higher than 80 ℃;
and the pipeline state monitoring and switching system controls the switching of the low-temperature system and the high-temperature system, and monitors the temperature of the antifreeze liquid entering the fuel cell and the pressure of the antifreeze liquid entering and exiting the fuel cell.
2. The fuel cell bipolar plate high and low temperature scouring test system according to claim 1, wherein the fuel cell has an antifreeze inlet and an antifreeze outlet;
a first pump is arranged at an antifreeze liquid outlet of the fuel cell, and the first pump is respectively communicated with the low-temperature system and the high-temperature system and returns to an antifreeze liquid inlet;
and the pipeline state monitoring and switching system controls the work of the first pump.
3. The fuel cell bipolar plate high and low temperature scouring test system according to claim 2, wherein a ball valve is arranged at an outlet of the first pump, and an angle seat valve is arranged among the low temperature system, the high temperature system and the ball valve;
angle seat valves are arranged among the low-temperature system, the high-temperature system and the antifreeze liquid inlet;
the pipeline state monitoring and switching system controls the work of the ball valve and the angle seat valve.
4. The fuel cell bipolar plate high and low temperature scouring test system according to claim 2, wherein a flow meter, an inlet pressure sensor and an inlet temperature sensor are arranged at the antifreeze liquid inlet;
an outlet pressure sensor is arranged at the antifreeze liquid outlet;
the pipeline state monitoring and switching system acquires data of a flowmeter, an inlet pressure sensor, an inlet temperature sensor and an outlet pressure sensor.
5. The fuel cell bipolar plate high and low temperature scouring test system according to claim 1, wherein there are two groups of the low temperature systems;
the test system also comprises an environment bin, the temperature of the environment bin is lower than-30 ℃, and the two groups of low-temperature systems are positioned in the environment bin.
6. The fuel cell bipolar plate high and low temperature scouring test system according to any one of claims 1 to 5, wherein the low temperature system comprises a cold liquid tank, a cooling pump machine and a radiator, and the cold liquid tank is sequentially connected with the cooling pump machine and the radiator through pipelines and is connected back to the inside of the cold liquid tank;
the pipeline state monitoring and switching system controls the work of the cooling pump and the radiator.
7. The fuel cell bipolar plate high and low temperature scouring test system according to claim 6, wherein the high temperature system comprises a hot liquid tank and a heater arranged in the hot liquid tank;
the pipeline state monitoring and switching system controls the operation of the heater.
8. The fuel cell bipolar plate high and low temperature scouring test system according to claim 7, further comprising a back pressure regulating valve, wherein the back pressure regulating valve is respectively communicated with the hot liquid tank and the cold liquid tank;
the pipeline state monitoring and switching system controls the work of the back pressure regulating valve.
9. A testing method of the fuel cell bipolar plate high and low temperature scouring testing system according to any one of claims 1 to 8,
before the test is started, preheating the antifreeze in the high-temperature system, reducing the antifreeze in the low-temperature system to reach a preset test temperature;
running a test, setting parameters, injecting nitrogen into the hot liquid tank and the cold liquid tank to realize back pressure, and providing the same pressure for the anode and the cathode of the fuel cell stack of the tested piece;
when the high-temperature operation is carried out, the angle seat valve communicated with the hot liquid tank is opened, the angle seat valve communicated with the cold liquid tank is closed, and the first pump drives the flow of the whole loop;
when the engine runs at a low temperature, an angle seat valve communicated with a cold liquid tank is opened, an angle seat valve communicated with a hot liquid tank is closed, a first pump drives the flow of the whole loop, and the rotating speed of the first pump is increased according to the actual flow;
and after the test is finished, diagnosing the galvanic pile, detecting the current leakage of hydrogen water and empty water, confirming the proportion of the abnormal polar plate, collecting graphite particles washed off in the anti-freezing solution by using filter paper, and weighing after drying.
10. The fuel cell bipolar plate high and low temperature flushing test method according to claim 9, wherein the parameters include cycle time of high and low temperature cycles, total cycle number, pressure of the tested piece, and flow rate of the tested piece.
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