CN211826393U - Single cell detection device for fuel cell stack - Google Patents
Single cell detection device for fuel cell stack Download PDFInfo
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- CN211826393U CN211826393U CN201922240785.0U CN201922240785U CN211826393U CN 211826393 U CN211826393 U CN 211826393U CN 201922240785 U CN201922240785 U CN 201922240785U CN 211826393 U CN211826393 U CN 211826393U
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Abstract
The utility model provides a single cell detection device of fuel cell pile, detection device mainly includes pressure device, determine module and gas passage, the utility model also provides a single cell membrane electrode performance detection method of fuel cell, through the utility model provides a device can carry out the multifunctions to every membrane electrode that will integrate before carrying out the fuel cell pile integration and detect, single cell membrane electrode performance under single cell membrane electrode leakproofness detection, single cell membrane electrode's the detection of opening a way and normal operating temperature, it is especially important to the performance and the life-span of guaranteeing the pile.
Description
Technical Field
The utility model relates to a fuel cell technical field, concretely relates to single cell detection device of fuel cell pile.
Background
With the development of the fuel cell industry, the demand of fuel cell systems has increased dramatically. The fuel cell system with high specific power is widely applied to various aspects in life production such as fixed and movable power stations for replacing oil engines to generate electricity, vehicle-mounted power supplies, individual combat portable power supplies and the like. The fuel cell power generation system has the advantages of small pollution, low fuel price, low noise, high specific power and the like, compared with gasoline and diesel power generation equipment, the working temperature of the fuel cell is generally lower than 200 ℃, the fuel cell is very safe to the environment and operators, and on military equipment, the fuel cell power generation system can supply power to military equipment with higher stealth requirements due to the fact that the working temperature is low, the noise is low, and the heat radiation is far smaller than that of the gasoline and diesel power generation equipment.
The core problem in high specific power fuel cell systems is to develop a fuel cell stack with high specific power, high uniformity, and long lifetime, where the membrane electrode is the site where the main chemical reactions in the stack occur. With the continuous improvement of the specific power of the fuel cell stack, the requirements of the stack on the membrane electrode are also continuously improved, the effective area of the membrane electrode is continuously increased, and the number of the membrane electrodes in the stack is also continuously increased from dozens of the membrane electrodes to hundreds of the membrane electrodes, so that before the fuel cell stack is integrated, performance detection is performed on each membrane electrode to be integrated, the performance detection comprises the sealing property of the membrane of each membrane electrode, the open circuit of the membrane electrode and the corresponding voltage of the membrane electrode under different current densities, so that the performance consistency between each membrane electrode in the stack is ensured, and the method is particularly important for ensuring the performance and the service life of the stack.
However, in the field of fuel cells, the detection function of the independent fuel cell detection device in the prior art is relatively single, and the voltage corresponding to the membrane electrode under different current densities, the sealing performance of the membrane electrode and the open circuit detection of the membrane electrode cannot be achieved at the same time.
The amount of fuel cells produced by enterprises is usually large, if the performance of each single cell needs to be separately tested by different devices, each test for one fuel cell is not only high in cost, but also takes a lot of time and energy, and the development of the enterprises is greatly limited.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a many performances detection device and detection method of independent fuel cell single cell, the single cell device of examination to await measuring finishes the back in the detection device that this application provided, can have the open circuit detection of the voltage that corresponds under the different current density of membrane electrode, the leakproofness of membrane electrode and membrane electrode concurrently.
The utility model discloses technical scheme as follows:
in a first aspect, the present invention provides a single cell detection device for a fuel cell stack, the detection device comprising a pressurizing device, a detection assembly and a gas channel;
the pressurizing device is arranged at the upper part of the detection assembly and is used for controlling the compression ratio of the membrane electrode in the single cell device to be tested;
the detection assembly comprises an upper heating plate, an upper cushion block, a lower heating plate and a thermocouple;
the upper cushion block is positioned above the lower cushion block, the upper heating plate is positioned above the upper cushion block, and the lower heating plate is positioned below the lower cushion block;
the upper heating plate and the lower heating plate are connected with a positive power line and a negative power line;
the upper cushion block and the lower cushion block are flow collecting cushion blocks;
the side surface of the upper cushion block is provided with a current collecting screw rod hole I, the side surface of the lower cushion block is provided with a current collecting screw rod hole II, and gold-plated current collecting rods are arranged in the current collecting screw rod holes I, II;
the thermocouple is provided with a metal probe which is contacted with a bipolar plate of the single cell device to be tested;
the gas channel comprises a hydrogen channel and an air input channel;
the hydrogen channel comprises a hydrogen input channel and a hydrogen output channel, and the hydrogen input channel and the hydrogen output channel are respectively communicated with a hydrogen inlet and a hydrogen outlet of the single cell device to be tested;
the air input channel is communicated with an air inlet of the single-cell device to be tested.
Based on the above technical solution, it is preferable that,
the detection device also comprises a supporting and fixing device, and the supporting and fixing device is used for fixing the pressurizing device and the detection assembly;
the detection assembly further comprises an upper base, a fixed metal frame upper frame, a fixed metal frame lower frame, a lower base and a photoelectric displacement sensor;
the upper base is fixed with the pressurizing device, the upper heating plate is embedded into the upper base, the upper frame is positioned below the upper base, the upper frame and the upper base are sealed,
the upper cushion block is embedded into the upper frame, and the lower cushion block is embedded into the lower frame;
the lower frame of the fixed metal frame is embedded into the lower base;
the lower heating plate is arranged between the lower frame of the fixed metal frame and the lower base.
Based on the above technical solution, it is preferable that,
a square groove I is formed in one surface, close to the upper frame, of the upper base, a square groove II is formed in one surface, close to the lower frame, of the lower base, the upper heating plate is embedded into the square groove I, and the lower heating plate is embedded into the square groove II;
the depth of the square groove is greater than the thickness of the heating plate;
a wire groove I and a wire groove II are formed in one side of the square groove I, an anode power line is embedded in the wire groove I, and a cathode power line is embedded in the wire groove II; a wire groove III and a wire groove IV are formed in one side of the square groove II, the wire groove III is embedded into an anode power line, and the wire groove IV is embedded into a cathode power line;
the lower base is also provided with a slot, the slot is positioned at the upper part of the square groove II, the shape and the size of the slot are matched with the lower end of the lower frame, and the lower end of the lower frame is embedded into the slot;
the depth of the groove is smaller than the thickness of the lower frame of the fixed metal frame.
Based on the above technical solution, it is preferable that,
the shape of the hollow position of the upper frame is matched with that of the upper cushion block, the shape of the hollow position of the lower frame is matched with that of the lower cushion block, the side surface of the upper frame is provided with an opening corresponding to the current collecting screw rod hole I, and the side surface of the lower frame is provided with an opening corresponding to the current collecting screw rod hole II;
one side of the upper frame, which is close to the lower frame, is provided with a bipolar plate groove I, one side of the lower frame, which is close to the upper frame, is provided with a bipolar plate groove II, and the shape of the groove is the same as that of a tested single-cell bipolar plate;
a thermocouple hole I is formed in the side face of the upper frame and is located in the middle of the square groove I in the vertical direction, a thermocouple hole II is formed in the side face of the lower frame and is located in the middle of the square groove II in the vertical direction;
one side, close to the upper frame, of the lower fixed metal frame is provided with three positioning pins which are distributed in an isosceles triangle shape;
based on the above technical solution, it is preferable that,
the supporting and fixing device comprises an upper top plate, a lower bottom plate and four guide rods;
the four guide rods are supported between four corners of the upper top plate and the lower bottom plate, and the upper top plate can slide along the direction of the guide rods;
the pressurizing device comprises an air cylinder and a photoelectric displacement sensor;
the air cylinder comprises an air cylinder body and an air cylinder push rod;
the upper end of the cylinder body is fixed at the lower end of the upper top plate, and the lower end of the cylinder body is provided with a telescopic cylinder push rod;
the upper base is arranged at the lower end of the cylinder push rod, and the lower end of the lower base is fixedly connected with the lower bottom plate through four positioning screws;
the photoelectric displacement sensor comprises a photoelectric displacement sensor probe and a photoelectric displacement sensor reference part, and is used for controlling the movement of the cylinder push rod;
the sensor reference part is arranged on the side surface of the lower frame of the fixed metal frame, the sensor probe is arranged on the side surface of the upper base, and the sensor probe and the sensor reference part are matched for use.
The use mode of the pressurizing device is as follows: the device comprises a cylinder push rod, a photoelectric displacement sensor, a diaphragm electrode.
Based on the above technical solution, it is preferable that,
the lower bottom plate, the lower base and the lower frame of the fixed metal frame are provided with adaptive openings as hydrogen inlet channels;
the opening of the lower base plate is used as a hydrogen input channel I, the hydrogen input channel I is communicated with an external hydrogen source, the opening of the lower base is used as a hydrogen input channel II, and the opening of the lower frame of the fixed metal frame is used as a hydrogen input channel III;
the hydrogen provided by the external air source enters the single cell detection device through the hydrogen input channel I, and then is communicated with the hydrogen inlet of the single cell device through the hydrogen input channel I and the hydrogen input channel II in sequence and the hydrogen input channel III in sequence.
The upper frame and the upper base of the fixed metal frame are respectively provided with a matched opening as a hydrogen output channel;
the opening of the upper frame of the fixed metal frame is used as a hydrogen output channel I, and the opening of the upper base is used as a hydrogen output channel II;
the hydrogen discharged from the hydrogen outlet of the single-cell device enters the hydrogen output channel II through the hydrogen output channel I so as to be connected with an external hydrogen discharge pipeline.
The lower bottom plate, the lower base and the lower frame of the fixed metal frame are provided with adaptive openings as air input channels;
the lower bottom plate is provided with an opening as an air input channel I, and the air input channel I is communicated with an external air source; the lower base is provided with a hole as an air input channel II, and the lower frame of the fixed metal frame is provided with a hole as an air input channel III.
The outside air enters the single-cell detection device through the air input channel I, then sequentially enters the groove through the air input channel II and the air input channel III through the air input channel I, and then enters the air inlet of the single-cell device through the groove.
The hydrogen output channel I and the hydrogen output channel II have the same diameter and are concentrically arranged, and the hydrogen output channel I and the hydrogen output channel II are sealed by a fluororubber O-shaped ring;
the hydrogen input channel II and the hydrogen input channel III are the same in diameter and are concentrically arranged, and the hydrogen input channel II and the hydrogen input channel III are sealed by a fluororubber O-shaped ring;
the hydrogen output channel II is an opening with internal threads;
based on the above technical solution, it is preferable that,
the upper cushion block and the lower cushion block are stainless steel gold-plated current collecting cushion blocks;
the upper cushion block and the lower cushion block are square blocks with four rounded corners;
the upper heating plate and the lower heating plate are one or two of a 24V or 48V direct current heating plate and a 220V alternating current heating plate;
the upper heating sheet and the lower heating sheet are made of silicon rubber or stainless steel;
the precision of the photoelectric displacement sensor is less than or equal to 5 um;
the photoelectric displacement sensor probe is arranged on the side surface of the upper base through a buckle;
the guide rod is fixed with the upper top plate and the lower bottom plate through bolts, the upper top plate and the lower bottom plate are made of stainless steel plates, and the guide rod is made of smooth chromium-plated stainless steel;
the upper base is a square block with four rounded corners made of stainless steel chromium-plated materials, and is mounted at the lower end of the cylinder push rod through a bolt;
in a second aspect, the present invention provides a method for detecting multiple performances of a fuel cell, the method comprising:
the method comprises the steps of assembling two bipolar plates and a membrane electrode in a single cell assembly mode, arranging the membrane electrode between the two bipolar plates, arranging a first sealing gasket between the membrane electrode and an upper bipolar plate, arranging a second sealing gasket between the membrane electrode and a lower bipolar plate, and arranging a cathode and anode flow field and a cathode and anode gas inlet and outlet of the two bipolar plates in an area surrounded by the first sealing gasket and the second sealing gasket.
According to the utility model provides a fuel cell galvanic pile single cell detection device will await measuring the single cell install detection device is last, and the installation method is as follows: and (3) placing the assembled single cell between an upper cushion block and a lower cushion block, contacting an upper bipolar plate with the upper cushion block and a lower bipolar plate with the lower cushion block, respectively inserting two gold-plated current collecting rods into current collecting screw rod holes I, II to lead out two output leads, controlling the compression ratio of the membrane electrode in the single cell device by a pressurizing device, and maintaining the pressure by the pressurizing device when the compression ratio of the membrane electrode in the single cell device meets the requirement, wherein the single cell device is completely installed at the moment.
A fuel cell single cell membrane electrode tightness detection method, finish the installation of the single cell in the said detection device of the said technical scheme, carry on the single cell membrane electrode to seal and detect, hydrogen enters the single cell bipolar plate through the hydrogen input channel on the said detection device, when the pressure sensor index in the external hydrogen inlet pipeline reaches the assigned value, close the electromagnetic valve in hydrogen inlet pipeline and hydrogen outlet pipeline, stop hydrogen input, the pressure maintaining 1-2min, if the pressure sensor index changes and is less than 2 permillage, the membrane electrode tested is qualified, if the pressure sensor index changes and is greater than 2 permillage, the membrane electrode tested is very unqualified.
A method for detecting the performance of single-cell membrane electrode of fuel cell includes such steps as installing single cell in a detector, connecting two output wires from gold-plated current-collecting rod to load, contacting the metal probe of thermocouple with the bipolar plate of single-cell unit to be tested, testing and recording the temperature of single cell, heating the upper and lower pads by upper and lower heating plates, heating the single-cell unit indirectly, introducing hydrogen and air to the unit via gas channel when the membrane electrode reaches working temp, discharging the load, and comparing the voltage values of single cells.
The open circuit detection method of the single cell membrane electrode of the fuel cell is characterized in that after a single cell is installed in the detection device in any technical scheme, hydrogen is introduced into the detection device, and a universal meter is adopted to measure the voltage between two leads led out from the current collecting screw holes of an upper cushion block and a lower cushion block.
Advantageous effects
1. The utility model provides a many performances detection device and detection method of independent fuel cell list pond, before the fuel cell pile is integrated, the list pond that will await measuring finishes the back in the detection device that this application provided, can have the voltage that corresponds under the different current density of membrane electrode concurrently, the leakproofness of membrane electrode and the open circuit of membrane electrode and detect, and it is especially important to the performance and the life-span of guaranteeing the pile.
2. The utility model provides a detection device, after the unipond installation that awaits measuring finishes, can have the detection of above-mentioned three kinds of functions concurrently, practice thrift detection cost and check-out time, possess the potentiality that the engineering was enlargied, help the commercialization of fuel cell technique.
3. The performance of the membrane electrode, particularly the consistency between each membrane electrode arranged in the galvanic pile, plays a decisive role in the service life of the whole galvanic pile, so that the performance of each membrane electrode is detected before the galvanic pile is integrated, and the membrane electrodes are integrated after being classified in grades through the detected data, thereby being beneficial to the management and control of the quality of the galvanic pile, enabling the membrane electrodes with similar performance to be integrated into the same galvanic pile, greatly improving the consistency of the performance of the galvanic pile and prolonging the service life of the galvanic pile.
Drawings
FIG. 1 is a single cell detection device for a fuel cell stack;
FIG. 2 is an exploded view of a fuel cell stack cell detection device;
FIG. 3 is a lower plate of the support fixture;
FIG. 4 is a cylinder block and push rod;
FIG. 5 is a lower base;
FIG. 6 illustrates a lower frame of the fixed metal frame;
FIG. 7 is a gold plated current collection spacer;
FIG. 8 supports the guide rods of the fixture;
FIG. 9 is a hydrogen gas channel diagram;
fig. 10 air channel diagram.
In the figure:
101, an upper top plate, 102, a lower bottom plate and 103 guide rods;
201 cylinder body, 202 cylinder push rod, 203 photoelectric displacement sensor probe, 204 photoelectric displacement sensor reference part;
301 upper cushion block, 302 lower cushion block, 303 current collecting screw hole II, 304 upper base, 305 lower base, 306 slot, 307 square groove II, 308 wire groove III, 309 wire groove IV, 310 fixed metal frame upper frame, 311 fixed metal frame lower frame, 312 bipolar plate groove II, 313 thermocouple hole II, 314 locating pin;
401 hydrogen input channel I, 402 hydrogen input channel II, 403 hydrogen input channel III, 404 hydrogen output channel I, 405 hydrogen output channel II, 406 air input channel I, 407 air input channel II, 408 air input channel III, 409 air vent.
Detailed Description
A single cell detection device of a fuel cell stack comprises a supporting and fixing device, a pressurizing device, a detection assembly and a gas channel, wherein the pressurizing device is arranged at the upper part of the detection assembly and used for controlling the compression ratio of a membrane electrode in the single cell device to be tested, and the supporting and fixing device is used for fixing the pressurizing device and the detection assembly;
the detection assembly comprises an upper base 304, an upper heating plate, a fixed metal frame upper frame 310, an upper cushion block 301, a lower cushion block 302, a fixed metal frame lower frame 311, a lower heating plate, a lower base 305 and a thermocouple,
the upper base 304 is fixed with the pressurizing device, the upper heating plate is embedded into the upper base 304, the upper frame 310 is positioned below the upper base 304, the upper frame 310 is hermetically connected with the upper base 304, the upper cushion block 301 is embedded into the upper frame 310, the lower cushion block 302 is positioned below the upper cushion block 301, and the lower cushion block 302 is embedded into the lower frame 311; the fixed metal frame lower frame 311 is embedded in the lower base 305; the lower heating plate is arranged between the fixed metal frame lower frame 311 and the lower base 305, and the upper heating plate and the lower heating plate are both connected with a positive power line and a negative power line;
the side surface of the upper cushion block 301 is provided with a current collecting screw hole I, the side surface of the lower cushion block 302 is provided with a current collecting screw hole II 303, and gold-plated current collecting rods are arranged in the current collecting screw holes I, II; the upper cushion block 301 and the lower cushion block 302 are both stainless steel gold-plated current collecting cushion blocks, the upper cushion block 301 and the lower cushion block 302 are square blocks with four rounded corners, the thickness of each square block is 21.8mm, and the side length of each square block is 70 mm;
the upper heating plate and the lower heating plate are 220V alternating current heating plates; the upper heating plate and the lower heating plate are made of stainless steel;
the upper base 304 is a square block with four rounded corners and made of stainless steel chromium plating materials, the thickness of the square block is 23mm, the side length of the square block is 100mm, a square groove I is formed in one side, close to the upper frame 310, of the upper base 304, a square groove II307 is formed in one side, close to the lower frame 311, of the lower base 305, the upper heating plate is embedded into the square groove I, and the lower heating plate is embedded into the square groove II 307;
the depth of the square groove I is larger than the thickness of the upper heating plate, and the depth of the square groove II is larger than the thickness of the lower heating plate; the depth of the square groove II307 is smaller than the thickness of the fixed metal frame lower frame 311.
A wire groove I and a wire groove II are formed in one side of the square groove I, an anode power line is embedded in the wire groove I, and a cathode power line is embedded in the wire groove II; a wire groove III 308 and a wire groove IV 309 are formed in one side of the square groove II307, a positive power line is embedded into the wire groove III 308, and a negative power line is embedded into the wire groove IV 309;
the lower base 305 is further provided with a slot 306, the slot 306 is located at the upper part of the square groove II307, the shape and size of the slot 306 are matched with the lower end of the lower frame 311, and the lower end of the lower frame 311 is embedded in the slot 306.
The shape of the hollow position of the upper frame 310 is matched with that of the upper cushion block 301, the shape of the hollow position of the lower frame 311 is matched with that of the lower cushion block 302, the side surface of the upper frame 310 is provided with an opening corresponding to the current collecting screw hole I, and the side surface of the lower frame 311 is provided with an opening corresponding to the current collecting screw hole II 303;
a bipolar plate groove I is formed in one surface, close to the lower frame 311, of the upper frame 310, a bipolar plate groove II 312 is formed in one surface, close to the upper frame 310, of the lower frame 311, and the shape of the groove is the same as that of a tested single-cell bipolar plate;
a thermocouple hole I with the diameter of 1.2mm is formed in the side face of the upper frame 310, the thermocouple hole I is located in the middle of the square groove I in the vertical direction, a thermocouple hole II313 with the diameter of 1.2mm is formed in the side face of the lower frame 311, and the thermocouple hole II313 is located in the middle of the square groove II307 in the vertical direction;
thermocouples are arranged in the thermocouple holes I and the thermocouple holes II313, the thermocouples are provided with metal probes, and the metal probes are in contact with the bipolar plates of the single cell device to be tested;
the side, close to the upper frame 310, of the lower fixed metal frame 311 is provided with three positioning pins 314 for preventing the upper frame 311 and the lower frame 311 from being dislocated, and the three positioning pins 314 are distributed in an isosceles triangle shape;
the supporting and fixing device comprises an upper top plate 101, a lower bottom plate 102 and four guide rods 103, wherein the upper top plate 101 and the lower bottom plate 102 are two stainless steel plates with the thickness of 15mm, the guide rods 103 are smooth chromium-plated stainless steel guide rods 103 with the diameter of 16mm and the length of 300mm, four guide rods 103 are arranged at four corners of the lower bottom plate 102 through bolts, the upper ends of the four guide rods 103 are respectively arranged at four corners of the upper top plate 101 through bolts, and the upper top plate 101 can slide along the direction of the guide rods 103;
the pressurizing device comprises an air cylinder and a photoelectric displacement sensor, the air cylinder comprises an air cylinder body 201 and an air cylinder push rod 202, the upper end of the air cylinder body 201 is installed at the lower end of the upper top plate 101, the lower end of the air cylinder body 201 is provided with a telescopic air cylinder push rod 202, the upper base 304 is installed at the lower end of the air cylinder push rod 202 through bolts, and the lower end of the lower base 305 is fixedly connected with the lower bottom plate 102 through four positioning screws;
the photoelectric displacement sensor comprises a sensor reference part 204 and a photoelectric displacement sensor probe 203, the photoelectric displacement sensor is used for controlling the movement of the cylinder push rod 202, the sensor reference part 204 is installed on the side surface of the fixed metal frame lower frame 311, the probe is installed on the side surface of the upper base 304 through a buckle, and the sensor reference part 204 and the probe are matched for use;
the cylinder is an SMC (sheet molding compound) plate cylinder, the photoelectric displacement sensor is a Nikken displacement sensor, the cylinder is adjusted through air pressure, the accuracy is controlled through the photoelectric displacement sensor, and the control accuracy is less than or equal to 5 um.
The gas channel comprises a hydrogen channel and an air input channel; the hydrogen channel comprises a hydrogen input channel and a hydrogen output channel, and the hydrogen input channel and the hydrogen output channel are respectively communicated with a hydrogen inlet and a hydrogen outlet of the single cell device to be tested; the air input channel is communicated with an air inlet of the single-cell device to be tested.
The lower base plate 102, the lower base 305 and the fixed metal frame lower frame 311 are all provided with matched openings as hydrogen inlet channels; the open pore of the lower base plate 102 is used as a hydrogen input channel I401, the hydrogen input channel I401 is communicated with an external hydrogen source, the open pore of the lower base 305 is used as a hydrogen input channel II 402, and the open pore of the fixed metal frame lower frame 311 is used as a hydrogen input channel III 403;
the hydrogen input channel II 402 and the hydrogen input channel III 403 are the same in diameter and are concentrically arranged, and the hydrogen input channel II 402 and the hydrogen input channel III 403 are sealed by a fluororubber O-shaped ring;
hydrogen provided by an external air source enters the single cell detection device through the hydrogen input channel I401, and then is communicated with a hydrogen inlet of the single cell device through the hydrogen input channel I401 sequentially through the hydrogen input channel II 402 and the hydrogen input channel III 403.
The fixed metal frame upper frame 310 and the upper base 304 are respectively provided with matched openings as hydrogen output channels; the opening of the upper frame 310 of the fixed metal frame is used as a hydrogen output channel I404, and the opening of the upper base 304 is used as a hydrogen output channel II 405;
the hydrogen output channel I404 and the hydrogen output channel II 405 are the same in diameter and are concentrically arranged, and the hydrogen output channel I404 and the hydrogen output channel II 405 are sealed by a fluororubber O-shaped ring;
the hydrogen discharged from the hydrogen outlet of the single cell device enters the hydrogen output channel II 405 through the hydrogen output channel I404, so that the hydrogen is connected with an external hydrogen discharge pipeline.
The lower base plate 102, the lower base 305 and the fixed metal frame lower frame 311 are all provided with adaptive open holes as air input channels; the lower base plate 102 is provided with an opening as an air input channel I406, and the air input channel I406 is communicated with an external air source; the lower base 305 has an opening as an air input channel II 407, and the fixed metal frame lower frame 311 has an opening as an air input channel III 408.
The outside air enters the single-cell detection device through an air input channel I406, then enters the groove through the air input channel I406 sequentially through an air input channel II 407 and an air input channel III 408, and then enters the air inlet of the single-cell device through the groove.
The air discharged from the cell unit may be directly discharged to the outside of the sensing unit through the air discharge port 409 of the fixed metal frame lower frame 311.
The hydrogen input channel I401, the hydrogen output channel II 404 and the air input channel I407 are provided with internal threads, and the diameter of the opening is 6mm and the opening is provided with NPT internal threads;
the test procedure was as follows:
assembling a single pool: firstly, two bipolar plates and a membrane electrode are assembled in a single cell assembly mode, the membrane electrode is arranged between the two graphite bipolar plates, a first sealing gasket with the thickness of 0.5mm is arranged between the membrane electrode and an upper bipolar plate, a second sealing gasket with the thickness of 0.5mm is arranged between the membrane electrode and a lower bipolar plate, and a cathode flow field and an anode gas inlet and outlet of the two bipolar plates are positioned in an area surrounded by the first sealing gasket and the second sealing gasket.
According to the utility model provides a fuel cell galvanic pile single cell detection device will await measuring the single cell install detection device is last, and the installation method is as follows: the assembled single cell is embedded between a bipolar plate groove I and a bipolar plate groove II 312 of an upper frame 311 and a lower frame 311 of a fixed metal frame for limiting, two gold-plated current collecting rods are respectively inserted into current collecting screw rod holes I, II to lead out two output lead wires, a pretightening force is given to the single cell device to be tested through the downward movement of an air cylinder push rod 202, the downward displacement of the air cylinder push rod 202 is controlled through a photoelectric displacement sensor arranged on the upper frame 310, when the compression ratio of a membrane electrode meets the requirement (the compression ratio is 15% -20%), the photoelectric displacement sensor transmits an electric signal to enable the air cylinder push rod 202 to automatically stop moving downwards and maintain pressure, and at the moment, the single cell device is completely installed.
A method for detecting the sealing performance of single-cell membrane electrode of fuel cell includes such steps as installing single cell in a detector, detecting the sealing performance of single-cell membrane electrode, passing hydrogen gas through the hydrogen gas inlet channel of detector to the bipolar plate of single-cell, closing the electromagnetic valves in hydrogen inlet and outlet pipelines when the indication of pressure sensor in external hydrogen inlet pipeline reaches a predefined value (800-1000 Pa), stopping hydrogen gas input, and holding pressure for 1-2 min.
A method for detecting the performance of single cell membrane electrode of fuel cell includes such steps as installing single cell in the detector, connecting two output wires from gold-plated current collecting rod to load, inserting thermocouple in thermocouple hole, contacting the metal probe of thermocouple with the bipolar plate of single cell to be tested, testing and recording the temperature of single cell, heating the upper and lower pads 301 and 302 by upper and lower heating plates, indirectly heating the single cell, introducing hydrogen and air to the device via gas channel when the membrane electrode temperature reaches 160-180 deg.C, discharging the load, and comparing the voltage values of single cells to judge the performance of membrane electrode.
A method for detecting open circuit of single cell membrane electrode of fuel cell includes such steps as installing single cell in the detector, introducing hydrogen gas to the detector, and measuring the voltage between two wires led out from the current-collecting screw holes of upper and lower pads 301 and 302 by universal meter, where the open-circuit voltage is generally 0.8-1.1V.
Claims (7)
1. A single cell detection device of a fuel cell stack is characterized in that,
the detection device comprises a pressurizing device, a detection assembly and a gas channel;
the pressurizing device is arranged at the upper part of the detection assembly and is used for controlling the compression ratio of the membrane electrode in the single cell device to be tested;
the detection assembly comprises an upper heating plate, an upper cushion block, a lower heating plate and a thermocouple;
the upper cushion block is positioned above the lower cushion block, the upper heating plate is positioned above the upper cushion block, and the lower heating plate is positioned below the lower cushion block;
the upper heating plate and the lower heating plate are connected with a positive power line and a negative power line;
the upper cushion block and the lower cushion block are flow collecting cushion blocks;
the side surface of the upper cushion block is provided with a current collecting screw rod hole I, the side surface of the lower cushion block is provided with a current collecting screw rod hole II, and gold-plated current collecting rods are arranged in the current collecting screw rod holes I, II;
the thermocouple is provided with a metal probe which is contacted with a bipolar plate of the single cell device to be tested;
the gas channel comprises a hydrogen channel and an air input channel;
the hydrogen channel comprises a hydrogen input channel and a hydrogen output channel, and the hydrogen input channel and the hydrogen output channel are respectively communicated with a hydrogen inlet and a hydrogen outlet of the single cell device to be tested;
the air input channel is communicated with an air inlet of the single-cell device to be tested.
2. The fuel cell stack cell detection device according to claim 1,
the detection device also comprises a supporting and fixing device, and the supporting and fixing device is used for fixing the pressurizing device and the detection assembly;
the detection assembly further comprises an upper base, a fixed metal frame upper frame, a fixed metal frame lower frame, a lower base and a photoelectric displacement sensor;
the upper base is fixed with the pressurizing device, the upper heating plate is embedded into the upper base, the upper frame is positioned below the upper base, and the upper frame and the upper base are sealed;
the upper cushion block is embedded into the upper frame, and the lower cushion block is embedded into the lower frame;
the lower frame of the fixed metal frame is embedded into the lower base;
the lower heating plate is arranged between the lower frame of the fixed metal frame and the lower base.
3. The fuel cell stack cell detection device according to claim 2,
a square groove I is formed in one surface, close to the upper frame, of the upper base, a square groove II is formed in one surface, close to the lower frame, of the lower base, the upper heating plate is embedded into the square groove I, and the lower heating plate is embedded into the square groove II;
the depth of the square groove I is larger than the thickness of the upper heating plate, and the depth of the square groove II is larger than the thickness of the lower heating plate;
a wire groove I and a wire groove II are formed in one side of the square groove I, an anode power line is embedded in the wire groove I, and a cathode power line is embedded in the wire groove II; a wire groove III and a wire groove IV are formed in one side of the square groove II, the wire groove III is embedded into an anode power line, and the wire groove IV is embedded into a cathode power line;
the lower base is also provided with a slot, the slot is positioned at the upper part of the square groove II, the shape and the size of the slot are matched with the lower end of the lower frame, and the lower end of the lower frame is embedded into the slot;
the depth of the groove is smaller than the thickness of the lower frame of the fixed metal frame.
4. The fuel cell stack cell detection device according to claim 3,
the shape of the hollow position of the upper frame is matched with that of the upper cushion block, the shape of the hollow position of the lower frame is matched with that of the lower cushion block, the side surface of the upper frame is provided with an opening corresponding to the current collecting screw rod hole I, and the side surface of the lower frame is provided with an opening corresponding to the current collecting screw rod hole II;
one side of the upper frame, which is close to the lower frame, is provided with a bipolar plate groove I, one side of the lower frame, which is close to the upper frame, is provided with a bipolar plate groove II, and the shape of the groove is the same as that of a tested single-cell bipolar plate;
a thermocouple hole I is formed in the side face of the upper frame and is located in the middle of the square groove I in the vertical direction, a thermocouple hole II is formed in the side face of the lower frame and is located in the middle of the square groove II in the vertical direction;
the side, adjacent to the upper frame, of the lower fixed metal frame is provided with three positioning pins, and the three positioning pins are distributed in an isosceles triangle shape.
5. The fuel cell stack cell detection device according to claim 2,
the supporting and fixing device comprises an upper top plate, a lower bottom plate and four guide rods;
the four guide rods are supported between four corners of the upper top plate and the lower bottom plate, and the upper top plate can slide along the direction of the guide rods;
the pressurizing device comprises an air cylinder and a photoelectric displacement sensor;
the air cylinder comprises an air cylinder body and an air cylinder push rod;
the upper end of the cylinder body is fixed at the lower end of the upper top plate, and the lower end of the cylinder body is provided with a telescopic cylinder push rod;
the upper base is arranged at the lower end of the cylinder push rod, and the lower end of the lower base is fixedly connected with the lower bottom plate through four positioning screws;
the photoelectric displacement sensor comprises a photoelectric displacement sensor probe and a photoelectric displacement sensor reference part, and is used for controlling the movement of the cylinder push rod;
the sensor reference part is arranged on the side surface of the lower frame of the fixed metal frame, the sensor probe is arranged on the side surface of the upper base, and the sensor probe and the sensor reference part are matched for use.
6. The fuel cell stack cell detection device according to claim 5,
the lower bottom plate, the lower base and the lower frame of the fixed metal frame are provided with adaptive openings as hydrogen inlet channels;
the opening of the lower bottom plate is used as a hydrogen input channel I, and the hydrogen input channel I is communicated with an external hydrogen source; the opening of the lower base is used as a hydrogen input channel II, and the opening of the lower frame of the fixed metal frame is used as a hydrogen input channel III;
the upper frame and the upper base of the fixed metal frame are respectively provided with a matched opening as a hydrogen output channel;
the opening of the upper frame of the fixed metal frame is used as a hydrogen output channel I, and the opening of the upper base is used as a hydrogen output channel II;
the lower bottom plate, the lower base and the lower frame of the fixed metal frame are provided with adaptive openings as air input channels;
the lower bottom plate is provided with an opening as an air input channel I, and the air input channel I is communicated with an external air source; the lower base is provided with a hole serving as an air input channel II, and the lower frame of the fixed metal frame is provided with a hole serving as an air input channel III;
the hydrogen output channel I and the hydrogen output channel II have the same diameter and are concentrically arranged, and the hydrogen output channel I and the hydrogen output channel II are sealed by a fluororubber O-shaped ring;
the hydrogen input channel II and the hydrogen input channel III are the same in diameter and are concentrically arranged, and the hydrogen input channel II and the hydrogen input channel III are sealed by a fluororubber O-shaped ring;
the hydrogen input channel I, the hydrogen output channel II and the air input channel I are provided with holes with internal threads.
7. The fuel cell stack cell detection device according to claim 5,
the upper cushion block and the lower cushion block are stainless steel gold-plated current collecting cushion blocks;
the upper cushion block and the lower cushion block are square blocks with four rounded corners;
the upper heating plate and the lower heating plate are one or two of a 24V or 48V direct current heating plate and a 220V alternating current heating plate;
the upper heating sheet and the lower heating sheet are made of silicon rubber or stainless steel;
the precision of the photoelectric displacement sensor is less than or equal to 5 um;
the photoelectric displacement sensor probe is arranged on the side surface of the upper base through a buckle;
the guide rod is fixed with the upper top plate and the lower bottom plate through bolts, the upper top plate and the lower bottom plate are made of stainless steel plates, and the guide rod is made of smooth chromium-plated stainless steel;
the upper base is a square block with four rounded corners made of stainless steel chromium-plated materials, and the upper base is installed at the lower end of the cylinder push rod through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922240785.0U CN211826393U (en) | 2019-12-14 | 2019-12-14 | Single cell detection device for fuel cell stack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922240785.0U CN211826393U (en) | 2019-12-14 | 2019-12-14 | Single cell detection device for fuel cell stack |
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| CN211826393U true CN211826393U (en) | 2020-10-30 |
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