CN213181147U - Fuel cell diffusion layer gas transmission performance testing device - Google Patents
Fuel cell diffusion layer gas transmission performance testing device Download PDFInfo
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- CN213181147U CN213181147U CN202021755314.XU CN202021755314U CN213181147U CN 213181147 U CN213181147 U CN 213181147U CN 202021755314 U CN202021755314 U CN 202021755314U CN 213181147 U CN213181147 U CN 213181147U
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Abstract
The utility model provides a gas transmission performance testing device of a fuel cell diffusion layer, which is used for testing the diffusion transmission performance of pressure gas on the fuel cell diffusion layer, and comprises a gas diffusion simulation device; the gas diffusion simulation device comprises a combined body consisting of an upper tank body, a middle tank body and a lower tank body which are arranged from top to bottom; the tank cavities of the upper tank body, the middle tank body and the lower tank body in the combined body are mutually connected to form a pressure gas cavity for gas diffusion test; the pressure gas cavity is provided with an air inlet communicated with an external air source and a first differential pressure test hole connected with a differential pressure meter; the middle tank body is connected with the lower tank body through a fastener, and a gas diffusion channel is formed at the connecting position through a diffusion layer structure; the utility model discloses can test the gas transmission performance of fuel cell diffusion layer accurately reliable.
Description
Technical Field
The utility model belongs to the technical field of the test equipment technique and specifically relates to a fuel cell diffusion layer gas transmission capability test device.
Background
The fuel cell is regarded as the first choice of clean and efficient power generation technology in the 21 st century because of its characteristics of high power generation efficiency, sustainable work, no pollution, low noise and the like. The proton exchange membrane fuel cell relates to a multi-physical field working environment of 'gas-water-heat-electricity', and mainly comprises four parts, namely a bipolar plate, a diffusion layer, a proton exchange membrane and a catalytic layer. The diffusion layer is arranged between the polar plate and the catalyst layer, mainly adopts a double-layer structure of carbon paper (a substrate layer) with a porous structure and carbon black sprayed on one surface (a microporous layer), and plays important roles of supporting the catalyst layer, conducting electrons, conducting gas, discharging water of a reaction product and the like. The gaseous fuel participates in the following cell reactions:
anode: h2-2e-→2H+
Cathode: 1/2O2+2H++2e-→H2O
And (3) total reaction: h2+1/2O2→H2O
The study showed that fuel H at the anode2And O of the cathode2It is required to be transported to the catalytic layer through the diffusion layer to participate in the electrochemical reaction. If the other transport coefficient of the diffusion layer is low, it is difficult to have sufficient fuel and oxygen reach the surface of the catalytic layer through the diffusion layer channels, resulting in a decrease in cell performance. Thus, proton exchangeThe gas transport performance of the diffusion layer of a membrane-change fuel cell is an important indicator of the performance of the diffusion layer.
Disclosure of Invention
The utility model provides a fuel cell diffusion layer gas transmission performance testing arrangement can test the gas transmission performance of fuel cell diffusion layer accurately reliable.
The utility model adopts the following technical scheme.
A gas transmission performance testing device for a diffusion layer of a fuel cell is used for testing the diffusion transmission performance of pressure gas in the diffusion layer of the fuel cell and comprises a gas diffusion simulation device; the gas diffusion simulation device comprises a combined body consisting of an upper tank body (1), a middle tank body (4) and a lower tank body (13) which are arranged from top to bottom; the tank cavities of the upper tank body, the middle tank body and the lower tank body in the combined body are mutually connected to form a pressure gas cavity for gas diffusion test; the pressure gas cavity is provided with an air inlet communicated with an external air source and a first differential pressure test hole (2) connected with a differential pressure meter; the middle tank body is connected with the lower tank body through a fastener, and a gas diffusion channel is formed at the connecting position through a diffusion layer structure.
The upper tank body is cylindrical; the air inlet hole and the pressure difference testing hole are formed in the side wall of the upper pool body.
The test hole and the air inlet hole are positioned at the same height of the side wall of the upper tank body, and the connecting line of the two holes is intersected with the central axis of the cylindrical upper tank body; the test hole is arranged right opposite to the air inlet; the upper tank body is in a pi-shaped cylinder shape.
The middle tank body is of a T-shaped cylindrical structure; the end surface of the top of the transverse end of the middle tank body is provided with a sink groove (6) for fixing a sealing ring; the width range of the sinking groove is 1-2 mm; the upper tank body is locked at the top of the transverse end of the middle tank body by a fastener.
The diffusion layer structure comprises a first annular silica gel sheet (14), a second annular silica gel sheet (8) and a gas diffusion layer (9) with the edge being nested and encapsulated by an annular frame silica gel sheet (10); the first annular silica gel sheet is supported on the edge of the bottom surface of the gas diffusion layer, and the edge of the top surface of the gas diffusion layer is covered with the second annular silica gel sheet; the annular frame silica gel sheet seals the edge of the gas diffusion layer (9) to prevent gas from leaking laterally; the first annular silica gel sheet and the second annular silica gel sheet clamp and fix the edges of the gas diffusion layers; the outside of the second annular silica gel piece (8) and the annular frame silica gel piece is sleeved with a high-elasticity O-shaped sealing ring (12).
The lower tank body is in an inverted pi-shaped cylinder shape, and the opening end of the lower tank body is connected with the middle tank body; a first-stage sinking platform and a second-stage sinking platform are arranged at the opening end of the lower tank body from bottom to top; a metal net (11) is arranged at the primary sinking platform; the diffusion layer structure is arranged at the position of the secondary sinking platform and is close to the top surface of the metal net.
And the upper area of the side wall of the lower tank body is provided with a second differential pressure test hole (15) connected with a differential pressure meter, and the lower part of the side wall of the lower tank body is provided with a gas flowmeter connecting pore passage (16).
The middle tank body is locked on the lower tank body by a fastening piece; and the upper area of the side wall of the lower tank body is also provided with a standby hole for connecting other sensors, and the standby hole is opposite to the second differential pressure test hole.
When the testing device is assembled, the T-shaped vertical end of the middle tank body can be in clamping groove type matching with the secondary sinking platform of the lower tank body, so that alignment and assembly are easy.
The first-stage sinking platform and the second-stage sinking platform are combined into a sample platform; the diameter of the primary sinking platform is slightly smaller than that of the secondary sinking platform; the gas diffusion layer of the diffusion layer structure is formed by a sample to be tested; when testing is carried out, gas entering the pressure gas cavity through the gas inlet hole of the upper tank body is diffused to the lower part of the gas diffusion layer through the gas diffusion layer and flows out of the connecting pore passage of the gas flowmeter; the metal mesh forms a support for the sample to be tested to prevent excessive deformation thereof.
Testing arrangement modern design easily assembles, and the main part comprises last well triplex. The upper tank body and the middle tank body adopt a detachable and separable structure, so that the processing is easy and the cleaning is convenient. The upper tank body gas cavity adopts a U-shaped structure, so that the flow of internal gas is facilitated, and the existence of dead volume space is avoided to the maximum extent. Compare with traditional device's face-to-face matching, the middle part cell body adopts T shape structure, and the secondary sinking platform of lower part cell body carries out the draw-in groove formula and matches, easily aims at during the assembly, avoids because of the face burnt diffusion layer damage that slides and cause.
Testing arrangement when design differential pressure gauge intercommunication position, has overcome traditional testing arrangement, and the pipeline that differential pressure gauge connects is very different with the gas chamber diameter that the diffusion layer is located, causes the pressure of surveying and the problem that the actual pressure that the diffusion layer top demonstrates because of the sudden grow of gas chamber has great difference. The diameters of the gas cavity communicated with the differential pressure gauge and the cavity above the diffusion layer are completely consistent, so that the measured gas pressure is closer to the gas pressure above the diffusion layer, and the accuracy of the gas permeability test of the diffusion layer is improved.
In the utility model, the sample to be measured is carbon paper used by the diffusion layer of the fuel cell, the sample stage adopts a multi-level design structure, the first level sinking stage is arranged below, the second level sinking stage is arranged above, and the diameter of the former is slightly smaller than that of the latter; the secondary sinking platform is used for placing diffusion layer carbon paper, and the metal wire mesh of the primary sinking platform is used for supporting the bottom, so that huge deformation and even breakage of brittle diffusion layer carbon paper caused by high-pressure gas impact are avoided; the secondary sinking platform utilizes ultrathin silica gel sheets 8 and 14 and an annular frame film 10 with the same thickness to seal the diffusion layer carbon paper 9 up and down and the periphery, and a high-elasticity O-shaped sealing ring 12 is sleeved outside, so that the gas side leakage is avoided as far as possible, and the test result is more accurate.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is an enlarged schematic view of the first and second sinking tables;
FIG. 3 is a schematic diagram of the present invention;
in the figure: 1-upper tank body; 2-a first differential pressure test hole; 4-middle tank body; 6-sinking the tank; 8-second annular silica gel sheet; 9-a gas diffusion layer; 10-ring frame silica gel sheet; 11-a metal mesh; 12-high elastic O-ring seal; 13-lower tank body; 14-a first annular silica gel sheet; 15-a second differential pressure test hole; 16-gas flow meter connecting pore canal; 17-secondary sinking stage; 18-a primary sinking platform; 19-differential pressure gauge; 20-a gas flow meter; 21-a high-pressure gas cylinder; 22-voltage regulator.
Detailed Description
As shown in fig. 1-3, a gas transmission performance testing device for a diffusion layer of a fuel cell, which is used for testing the diffusion transmission performance of pressure gas in the diffusion layer of the fuel cell, comprises a gas diffusion simulating device; the gas diffusion simulation device comprises a combined body consisting of an upper tank body 1, a middle tank body 4 and a lower tank body 13 which are arranged from top to bottom; the tank cavities of the upper tank body, the middle tank body and the lower tank body in the combined body are mutually connected to form a pressure gas cavity for gas diffusion test; the pressure gas cavity is provided with an air inlet communicated with an external air source and a first differential pressure test hole 2 connected with a differential pressure meter; the middle tank body is connected with the lower tank body through a fastener, and a gas diffusion channel is formed at the connecting position through a diffusion layer structure.
The upper tank body is cylindrical; the air inlet hole and the pressure difference testing hole are formed in the side wall of the upper pool body.
The test hole and the air inlet hole are positioned at the same height of the side wall of the upper tank body, and the connecting line of the two holes is intersected with the central axis of the cylindrical upper tank body; the test hole is arranged right opposite to the air inlet; the upper tank body is in a pi-shaped cylinder shape.
The middle tank body is of a T-shaped cylindrical structure; the end surface of the top of the transverse end of the middle tank body is provided with a sink groove 6 for fixing a sealing ring; the width range of the sinking groove is 1-2 mm; the upper tank body is locked at the top of the transverse end of the middle tank body by a fastener.
The diffusion layer structure comprises a first annular silica gel sheet 14, a second annular silica gel sheet 8 and a gas diffusion layer 9 with the edge embedded and encapsulated by an annular frame silica gel sheet 10; the first annular silica gel sheet is supported on the edge of the bottom surface of the gas diffusion layer, and the edge of the top surface of the gas diffusion layer is covered with the second annular silica gel sheet; the annular frame silica gel sheet seals the edge of the gas diffusion layer 9 to prevent the gas from leaking laterally; the first annular silica gel sheet and the second annular silica gel sheet clamp and fix the edges of the gas diffusion layers; the second ring-shaped silica gel sheet 8 and the ring-shaped frame silica gel sheet are sleeved with a high-elasticity O-shaped sealing ring 12.
The lower tank body is in an inverted pi-shaped cylinder shape, and the opening end of the lower tank body is connected with the middle tank body; a first-stage sinking platform and a second-stage sinking platform are arranged at the opening end of the lower tank body from bottom to top; a metal net 11 is arranged at the primary sinking platform; the diffusion layer structure is arranged at the position of the secondary sinking platform and is close to the top surface of the metal net.
And a second differential pressure test hole 15 connected with a differential pressure meter is arranged in the upper area of the side wall of the lower tank body, and a gas flowmeter connecting pore passage 16 is arranged at the lower part of the side wall of the lower tank body.
The middle tank body is locked on the lower tank body by a fastening piece; and the upper area of the side wall of the lower tank body is also provided with a standby hole for connecting other sensors, and the standby hole is opposite to the second differential pressure test hole.
When the testing device is assembled, the T-shaped vertical end of the middle tank body can be in clamping groove type matching with the secondary sinking platform of the lower tank body, so that alignment and assembly are easy.
The first-stage sinking platform and the second-stage sinking platform are combined into a sample platform; the diameter of the primary sinking platform is slightly smaller than that of the secondary sinking platform; the gas diffusion layer of the diffusion layer structure is formed by a sample to be tested; when testing is carried out, gas entering the pressure gas cavity through the gas inlet hole of the upper tank body is diffused to the lower part of the gas diffusion layer through the gas diffusion layer and flows out of the connecting pore passage of the gas flowmeter; the metal mesh forms a support for the sample to be tested to prevent excessive deformation thereof.
Example 1:
in this example, the upper tank body 1 is made of steel or aluminum, has an inner diameter of 60mm and is in a pi-shaped cylinder shape, and two holes are formed in the area, close to the bottom, of the upper tank body 1; one of the holes is an air inlet and is connected with an external air source with a pressure regulating function; the other hole is a first differential pressure test hole 2 which is connected with a differential pressure meter. Six screw holes are formed in an outward extending area at the bottom of the upper tank body 1 and are used for being connected with the middle tank body 4 through screws.
The middle tank body 4 is also made of steel or aluminum materials, has an inner diameter of 60mm and is of a T-shaped cylindrical structure. A1-2 mm sinking groove 6 is arranged on the surface of the middle tank body 4 and used for fixedly placing an O-shaped sealing ring, and after the sealing ring is placed, the upper tank body 1 and the middle tank body 4 are locked by six uniformly distributed screws.
The lower tank body 13 is made of steel or aluminum materials, has an inner diameter of 60mm and is in an inverted pi-shaped cylinder shape, a two-stage sinking platform is arranged at the opening position, and the inner diameter of the first-stage sinking platform is 64mm and the height of the first-stage sinking platform is 1.5 mm; the inner diameter of the secondary sinking platform is 94mm, and the height of the secondary sinking platform is 15 mm. A metal net 11 (steel wire net) with the diameter of 63mm and the thickness of 1.3mm is placed on the primary sinking platform.
The secondary stage is used for placing a gas diffusion layer 9 to be measured, and the diameter of the secondary stage is 70 mm.
When a sample is loaded, the diffusion layer 9 is firstly arranged on the central position of a first annular silica gel sheet 14 (the inner diameter is 60mm, the outer diameter is 80mm, and the thickness is 1.5 mm); then, an annular frame rubber sheet 10 with the thickness consistent with that of the diffusion layer, the inner diameter of 71mm and the outer diameter of 80mm is embedded outside the diffusion layer 9, so that the edge is encapsulated, and the gas is prevented from leaking laterally; then, a second annular silica gel sheet 8 (with the inner diameter of 60mm, the outer diameter of 80mm and the thickness of 1.5 mm) is placed on the diffusion layer 9, and the diffusion layer is fixed up and down by using the silica gel sheets 8 and 14; and finally, sleeving a high-elasticity O-shaped sealing ring 12 with the line diameter of 4mm outside the silica gel sheets 8 and 10 to prevent gas from leaking laterally.
Two holes are respectively formed in the left and right of the lower tank body 13 near the top area, one hole is a second differential pressure testing hole 15 and used for being connected with a differential pressure meter, the other hole can be used as a standby position of a special gas sensor and the like, and a gas flowmeter connecting hole channel 16 is formed in the bottom area of the lower tank body 13 and used for being connected with a gas flowmeter.
The lower tank body 13 and the middle tank body 4 are locked by six screws 5.
Example 2:
in the test of the device in embodiment 1, the air inlet pressure of the device is adjusted by the pressure monitoring mechanism, the high-precision differential pressure gauge connected with the holes 2 and 15 communicated with the two sides of the diffusion layer is opened, and the data of the differential pressure gauge is recorded when the differential pressure data are stable
I.e. reaching steady state diffusionThe flow rate data Q of the gas flowmeter at the gas flowmeter connecting port 16 is read.
The test data is processed as follows according to Darcy's formula
，
For permeation rate, Q is the volume flow, A is the transport layer area, j is the pressure gradient, μ is the medium viscosity, and k is the diffusion coefficient. The pressure gradient j can also be expressed as
When steady state permeation is reached, will
Bringing in
Δ x is brought in by the diffusion layer thickness l, the obtainable diffusion coefficient
. Measured by experiment
And Q is substituted into the formula, so that the diffusion coefficient k of the gas medium in the gas diffusion layer of the fuel cell can be calculated.
Claims (10)
1. The utility model provides a fuel cell diffusion layer gas transmission performance testing arrangement for test pressure gas spreads the dispersion performance at fuel cell diffusion layer, its characterized in that: the testing device comprises a gas diffusion simulating device; the gas diffusion simulation device comprises a combined body consisting of an upper tank body (1), a middle tank body (4) and a lower tank body (13) which are arranged from top to bottom; the tank cavities of the upper tank body, the middle tank body and the lower tank body in the combined body are mutually connected to form a pressure gas cavity for gas diffusion test; the pressure gas cavity is provided with an air inlet communicated with an external air source and a first differential pressure test hole (2) connected with a differential pressure meter; the middle tank body is connected with the lower tank body through a fastener, and a gas diffusion channel is formed at the connecting position through a diffusion layer structure.
2. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 1, characterized in that: the upper tank body is cylindrical; the air inlet hole and the pressure difference testing hole are formed in the side wall of the upper pool body.
3. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 2, characterized in that: the test hole and the air inlet hole are positioned at the same height of the side wall of the upper tank body, and the connecting line of the two holes is intersected with the central axis of the cylindrical upper tank body; the test hole is arranged right opposite to the air inlet; the upper tank body is in a pi-shaped cylinder shape.
4. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 2, characterized in that: the middle tank body is of a T-shaped cylindrical structure; the end surface of the top of the transverse end of the middle tank body is provided with a sink groove (6) for fixing a sealing ring; the width range of the sinking groove is 1-2 mm; the upper tank body is locked at the top of the transverse end of the middle tank body by a fastener.
5. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 4, characterized in that: the diffusion layer structure comprises a first annular silica gel sheet (14), a second annular silica gel sheet (8) and a gas diffusion layer (9) with edges nested and encapsulated by annular frame silica gel sheets; the first annular silica gel sheet is supported on the edge of the bottom surface of the gas diffusion layer, and the edge of the top surface of the gas diffusion layer is covered with the second annular silica gel sheet; the annular frame silica gel sheet seals the edge of the gas diffusion layer (9) to prevent gas from leaking laterally; the first annular silica gel sheet and the second annular silica gel sheet clamp and fix the edges of the gas diffusion layers; the second annular silica gel sheet (8) and the annular frame silica gel sheet (10) are sleeved with a high-elasticity O-shaped sealing ring (12).
6. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 5, characterized in that: the lower tank body is in an inverted pi-shaped cylinder shape, and the opening end of the lower tank body is connected with the middle tank body; a first-stage sinking platform and a second-stage sinking platform are arranged at the opening end of the lower tank body from bottom to top; a metal net (11) is arranged at the primary sinking platform; the diffusion layer structure is arranged at the position of the secondary sinking platform and is close to the top surface of the metal net.
7. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 5, characterized in that: and the upper area of the side wall of the lower tank body is provided with a second differential pressure test hole (15) connected with a differential pressure meter, and the lower part of the side wall of the lower tank body is provided with a gas flowmeter connecting pore passage (16).
8. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 5, characterized in that: the middle tank body is locked on the lower tank body by a fastening piece; and the upper area of the side wall of the lower tank body is also provided with a spare hole for connecting a sensor, and the spare hole is just opposite to the second differential pressure test hole.
9. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 6, characterized in that: when the testing device is assembled, the T-shaped vertical end of the middle tank body can be in clamping groove type matching with the secondary sinking platform of the lower tank body, so that alignment and assembly are easy.
10. The fuel cell diffusion layer gas transport performance testing apparatus according to claim 6, characterized in that: the first-stage sinking platform and the second-stage sinking platform are combined into a sample platform; the diameter of the primary sinking platform is slightly smaller than that of the secondary sinking platform; the gas diffusion layer of the diffusion layer structure is formed by a sample to be tested; when testing is carried out, gas entering the pressure gas cavity through the gas inlet hole of the upper tank body is diffused to the lower part of the gas diffusion layer through the gas diffusion layer and flows out of the connecting pore passage of the gas flowmeter; the metal mesh forms a support for the sample to be tested to prevent excessive deformation thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021755314.XU CN213181147U (en) | 2020-08-21 | 2020-08-21 | Fuel cell diffusion layer gas transmission performance testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021755314.XU CN213181147U (en) | 2020-08-21 | 2020-08-21 | Fuel cell diffusion layer gas transmission performance testing device |
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| CN213181147U true CN213181147U (en) | 2021-05-11 |
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| CN202021755314.XU Active CN213181147U (en) | 2020-08-21 | 2020-08-21 | Fuel cell diffusion layer gas transmission performance testing device |
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- 2020-08-21 CN CN202021755314.XU patent/CN213181147U/en active Active
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