Test fixture

Abstract

The utility model discloses a test fixture. The test fixture comprises a top plate, a bottom plate, a runner plate and a gas diffusion layer, the top plate is provided with a liquid inlet channel and a liquid outlet channel, the bottom plate is provided with an air inlet channel and a groove, the liquid inlet channel and the liquid outlet channel are oppositely arranged in the length direction of the test fixture, and the air inlet channel is located on one side of the groove. In the height direction of the test fixture, the runner plate is located between the top plate and the bottom plate, the runner plate is provided with a flow field area communicated with the liquid inlet channel and the liquid outlet channel, the gas diffusion layer is located between the runner plate and the bottom plate, and the gas diffusion layer is provided with a permeation area communicated with the gas inlet channel and covering the groove. Wherein at least part of projection of the flow field area and at least part of projection of the permeation area coincide with projection of the groove, so that the groove can contain deposition liquid, and a gas inlet of the gas inlet channel is connected with a detection device used for detecting the flow speed of gas. Therefore, a worker can test the water vapor transmission performance of the gas diffusion layer through the weight of the deposition liquid and the flow velocity of the gas.

Description

Technical Field

[0001] The present application relates to the technical field of gas diffusion layer performance test fixtures, in particular to a test fixture. Background Art

[0002] The proton exchange membrane (PEM) electrolyzer is mainly composed of membrane electrode, gas diffusion layer, bipolar plate, seal and end plate. Among them, the gas diffusion layer is one of the key components of the electrolyzer, which is mainly used to transfer the reaction liquid to the membrane electrode side for reaction and to transfer the generated gas to the plate flow channel for discharge from the electrolyzer. Therefore, the water-gas transmission performance of the gas diffusion layer has an important influence on the working performance of the electrolyzer.

[0003] At present, in order to test the water-gas transmission performance of the gas diffusion layer, it is usually assembled with other components into a complete electrolytic cell for testing. However, during the test, the preparation time before the test is long due to the cumbersome process of electrolytic cell assembly, which affects the efficiency of the gas diffusion layer performance test. Utility Model Content

[0004] In view of this, the present application provides a test fixture to solve the technical problem in the prior art that the process of stacking the electrolytic cell is relatively cumbersome, resulting in a long preparation time before testing, which affects the test work efficiency.

[0005] The present application provides a test fixture for testing a gas diffusion layer, the test fixture comprising a top plate, a bottom plate, a flow channel plate and a gas diffusion layer. The top plate is provided with a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel is arranged opposite to the liquid outlet channel along the length direction of the test fixture; the bottom plate is provided with an air inlet channel and a groove, and the air inlet channel is located on one side of the groove along the length direction of the test fixture; along the height direction of the test fixture, the flow channel plate is located between the top plate and the bottom plate, and the flow channel plate is provided with a flow field area, and the flow field area is connected with the liquid inlet channel and the liquid outlet channel; along the height direction of the test fixture, the gas diffusion layer is located between the flow channel plate and the bottom plate, and the gas diffusion layer is provided with a permeation area, and the permeation area is connected with the air inlet channel and covers the groove.

[0006] Among them, along the height direction of the test fixture, at least part of the projection of the flow field area and at least part of the projection of the penetration area coincide with the projection of the groove; the test fixture is also provided with a detection device, which is connected to the air inlet of the air inlet channel and is used to detect the flow rate of the gas.

[0007] In the embodiment of the present application, the top plate and the bottom plate are distributed along the height direction of the test fixture, the flow channel plate and the gas diffusion layer are located between the top plate and the bottom plate, and the flow channel plate is located on the side of the gas diffusion layer facing the top plate, so that at least part of the projection of the flow field area and at least part of the projection of the permeation area are both within the projection range of the groove, so that at least part of the liquid can flow into the groove through the permeation area to form a deposited liquid, and then the staff can test the gas diffusion layer's ability to transport liquid by the weight of the deposited liquid. At the same time, the detection device is connected to the air inlet of the air inlet channel to detect the flow rate of the gas, so that the staff can test the gas diffusion layer's ability to transport gas by the flow rate of the gas.

[0008] Therefore, in this embodiment, it is only necessary to place the gas diffusion layer in the test fixture to measure the weight of the deposition liquid and the flow rate of the gas, so that the water vapor transmission performance of the gas diffusion layer can be tested at the same time, and there is no need to stack the gas diffusion layer with the membrane electrode, bipolar plate, end plate and other components into an electrolytic cell for testing, which is conducive to shortening the preparation time before the test and improving the work efficiency of the test work. And relative to the number of components of the electrolytic cell, the number of components of the test fixture provided in this embodiment is relatively small, which is not only conducive to improving the assembly and disassembly efficiency, but also conducive to reducing the test cost. At the same time, through the above-mentioned test method, the test fixture provided in this embodiment can be used to test the water vapor transmission performance of gas diffusion layers of different structures and materials, which is conducive to improving the versatility of the test fixture. In addition, the flow channel plate and the top plate are detachably connected, so that the test fixture provided in this embodiment can also be used to test the water vapor transmission performance of the same gas diffusion layer in different flow field areas, which is conducive to further expanding the scope of application of the test fixture.

[0009] In a possible implementation, along the height direction of the test fixture, a first test area is provided on a side of the top plate facing the gas diffusion layer, and a second test area is provided on a side of the bottom plate facing the gas diffusion layer.

[0010] The liquid outlet of the liquid inlet channel and the liquid inlet of the liquid outlet channel are both arranged in the first test area, the air outlet of the air inlet channel and the groove are both arranged in the second test area, and the projection of the liquid outlet of the liquid inlet channel and the air outlet of the air inlet channel along the height direction of the test fixture at least partially overlaps.

[0011] In a possible embodiment, along the length and width directions of the test fixture, a first sealing area for accommodating a first seal is further provided on the outer side of the first test area, a second sealing area for accommodating a second seal is further provided on the outer side of the second test area, and a third sealing area for accommodating a third seal is further provided on the outer side of the flow field area.

[0012] The first sealing area, the second sealing area and the third sealing area are all annular structures, and their projections along the height direction of the test fixture overlap.

[0013] In a possible embodiment, along the length and width directions of the test fixture, a plurality of first positioning holes distributed at intervals are provided on the outer side of the first sealing area, a plurality of second positioning holes distributed at intervals are provided on the outer side of the second sealing area, and a plurality of third positioning holes distributed at intervals are provided on the outer side of the third sealing area, and the first positioning holes, the second positioning holes and the third positioning holes are aligned along the height direction of the test fixture.

[0014] The test fixture further includes a plurality of positioning members, and along a height direction of the test fixture, each of the positioning members penetrates each of the first positioning holes, each of the second positioning holes, and each of the third positioning holes.

[0015] In a possible implementation, a packaging area is further provided outside the penetration area along the length direction and the width direction of the test fixture, and the outer edge of the packaging area abuts against each of the positioning members.

[0016] In a possible implementation, the liquid outlet of the liquid inlet channel, the liquid inlet of the liquid outlet channel, and the air outlet of the air inlet channel are all rectangular structures extending along the width direction of the test fixture.

[0017] Along the width direction of the test fixture, the length of the liquid outlet of the liquid inlet channel is L1, the length of the liquid inlet of the liquid outlet channel is L2, the length of the air outlet of the air inlet channel is L3, the width of the flow field area is L4, the width of the groove is L5, and L1, L2, L3, L4 and L5 satisfy L4<L1, L4<L2, L5<L3, L1=L2=L3.

[0018] In a possible implementation, the test fixture further includes a first control device, one end of which is connected to the detection device, and the other end of which is connected to a gas supply device, and the first control device is used to control the pressure of the gas.

[0019] In a possible implementation, the test fixture further includes a second control device, one end of which is connected to the liquid inlet of the liquid inlet channel, and the other end of which is connected to the liquid supply device, and the second control device is used to control the flow rate of the liquid.

[0020] In a possible implementation manner, the flow field area is provided with a plurality of flow channels, and the plurality of flow channels extend along the length direction of the test fixture and are distributed at intervals along the width direction of the test fixture.

[0021] The flow channel is a straight flow channel or a curved flow channel.

[0022] In a possible implementation manner, the bottom wall of the flow channel is a hollow structure.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of a top plate provided in the present application in one embodiment;

[0026] Figure 2 is a schematic structural diagram of a base plate provided in the present application in an embodiment;

[0027] Figure 3 is a schematic structural diagram of a flow channel plate provided in the present application in one embodiment;

[0028] Figure 4 is a schematic structural diagram of a gas diffusion layer provided in the present application in one embodiment;

[0029] Figure 5 This is a working principle diagram of the test fixture provided in this application in one embodiment.

[0030] Description of reference numerals:

[0031] 1- Top plate;

[0032] 11-liquid inlet channel;

[0033] 111-first liquid outlet;

[0034] 12-liquid outlet channel;

[0035] 121- second liquid inlet;

[0036] 122- second liquid outlet;

[0037] 13-First test area;

[0038] 14- first sealing area;

[0039] 15-first positioning hole;

[0040] 2- bottom plate;

[0041] 21- air intake passage;

[0042] 211-air inlet;

[0043] 212-air outlet;

[0044] 22-groove;

[0045] 23- Second test area;

[0046] 24- second sealing area;

[0047] 25- second positioning hole;

[0048] 3- flow channel plate;

[0049] 31-flow area;

[0050] 32- third sealing area;

[0051] 33-third positioning hole;

[0052] 4- Gas diffusion layer;

[0053] 41-Infiltration zone;

[0054] 42- packaging area;

[0055] 5-Detection device;

[0056] 6- positioning piece;

[0057] 7- first control device;

[0058] 8- Second control device.

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0060] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0061] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0062] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0063] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] The embodiment of the present application provides a test fixture for testing the water vapor transmission performance of a gas diffusion layer. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the test fixture includes a top plate 1, a bottom plate 2, a flow channel plate 3 and a gas diffusion layer 4. The top plate 1 is provided with a liquid inlet channel 11 and a liquid outlet channel 12, and the bottom plate 2 is provided with an air inlet channel 21 and a groove 22. Along the length direction of the test fixture, the liquid inlet channel 11 and the liquid outlet channel 12 are arranged opposite to each other, and the air inlet channel 21 is located on one side of the groove 22. Along the height direction of the test fixture, the flow channel plate 3 is located between the top plate 1 and the bottom plate 2, and the flow channel plate 3 is provided with a flow field area 31 connected to the liquid inlet channel 11 and the liquid outlet channel 12, and the gas diffusion layer 4 is located between the flow channel plate 3 and the bottom plate 2, and the gas diffusion layer 4 is provided with a permeation area 41 connected to the air inlet channel 21 and covering the groove 22.

[0065] In the height direction of the test fixture, at least a portion of the projection of the flow field area 31 and at least a portion of the projection of the permeation area 41 overlap with the projection of the groove 22 .

[0066] Meanwhile, the liquid inlet channel 11 includes a first liquid inlet (not shown) and a first liquid outlet 111 , the liquid outlet channel 12 includes a second liquid inlet 121 and a second liquid outlet 122 , and the air inlet channel 21 includes an air inlet 211 and an air outlet 212 .

[0067] In addition, the test fixture is further provided with a detection device 5 , which is connected to the air inlet 211 of the air inlet channel 21 and is used to detect the flow rate of the gas.

[0068] In the embodiment of the present application, the top plate 1 and the bottom plate 2 are distributed along the height direction of the test fixture, the flow channel plate 3 and the gas diffusion layer 4 are located between the top plate 1 and the bottom plate 2, and the flow channel plate 3 is located on the side of the gas diffusion layer 4 facing the top plate 1, so that at least part of the projection of the flow field area 31 and at least part of the projection of the permeation area 41 are both located within the projection range of the groove 22, so that at least part of the liquid can flow into the groove 22 through the permeation area 41 to form a deposited liquid, and then the staff can test the gas diffusion layer 4's ability to transport liquid by the weight of the deposited liquid. At the same time, the detection device 5 is connected to the air inlet 211 of the air inlet channel 21, and is used to detect the flow rate of the gas, so that the staff can test the gas diffusion layer 4's ability to transport gas by the flow rate of the gas.

[0069] Specifically, the top plate 1 is provided with a liquid inlet channel 11 and a liquid outlet channel 12, the first liquid inlet port of the liquid inlet channel 11 and the second liquid outlet port 122 of the liquid outlet channel 12 are both connected to the liquid supply device, the first liquid outlet port 111 of the liquid inlet channel 11 and the second liquid inlet port 121 of the liquid outlet channel 12 are both connected to the flow field area 31 of the flow channel plate 3, so that a part of the liquid used for testing can flow into the flow field area 31 through the liquid inlet channel 11 and flow out of the flow field area 31 through the liquid outlet channel 12, and another part of the liquid used for testing can flow into the groove 22 of the bottom plate 2 through the gas diffusion layer 4 to form a deposition liquid.

[0070] The base plate 2 is provided with an air inlet channel 21 and a groove 22. The air inlet 211 of the air inlet channel 21 is connected to the gas supply equipment, and the air outlet 212 of the air inlet channel 21 is connected to the gas diffusion layer 4. The opening of the groove 22 faces the gas diffusion layer 4, and the permeation area 41 of the gas diffusion layer 4 covers the opening of the groove 22, so that a part of the gas used for testing can flow into the gas diffusion layer 4 through the air inlet channel 21, and penetrate into the flow field area 31 of the flow channel plate 3, and finally flow out of the flow field area 31 through the liquid outlet channel 12, and another part of the gas used for testing can flow into the groove 22 through the gas diffusion layer 4 to form a gas pressure space.

[0071] More specifically, during the test, the liquid used for the test can flow into the top plate 1 through the first liquid inlet of the liquid inlet channel 11, and flow into the flow field area 31 through the first liquid outlet 111 of the liquid inlet channel 11. In the process of liquid flow, a part of the liquid can flow into the groove 22 through the permeation area 41, thereby forming a deposited liquid, and the other part of the liquid cannot flow into the groove 22 due to the obstruction of the permeation area 41 and the gas pressure space, so that it can be mixed with the gas that permeates into the flow field area 31 and flow into the top plate 1 through the second liquid inlet 121 of the liquid outlet channel 12, and flow out of the top plate 1 through the second liquid outlet 122 of the liquid outlet channel 12.

[0072] The gas used for testing can flow into the bottom plate 2 through the air inlet 211 of the air inlet channel 21, and flow into the permeation area 41 through the air outlet 212 of the air inlet channel 21. In the process of gas flow, a part of the gas can flow into the flow field area 31 through the permeation area 41 and mix with the liquid that has not permeated into the groove 22, and then flow into the top plate 1 through the second liquid inlet 121 of the liquid outlet channel 12, and flow out of the top plate 1 through the second liquid outlet 122 of the liquid outlet channel 12. The other part of the gas cannot flow into the flow field area 31 due to the obstruction of the permeation area 41 and the liquid, so it can flow into the groove 22, thereby forming a gas pressure space.

[0073] Therefore, in this embodiment, it is only necessary to place the gas diffusion layer 4 in the test fixture to measure the weight of the deposited liquid and the flow rate of the gas, so that the water vapor transmission performance of the gas diffusion layer 4 can be tested at the same time, and there is no need to stack the gas diffusion layer 4 with the membrane electrode, bipolar plate, end plate and other components into an electrolytic cell for testing, which is conducive to shortening the preparation time before the test and improving the work efficiency of the test work. And relative to the number of components of the electrolytic cell, the number of components of the test fixture provided in this embodiment is relatively small, which is not only conducive to improving the assembly and disassembly efficiency, but also conducive to reducing the test cost. At the same time, through the above-mentioned test method, the test fixture provided in this embodiment can be used to test the water vapor transmission performance of gas diffusion layers 4 of different structures and materials, which is conducive to improving the versatility of the test fixture. In addition, the flow channel plate 3 and the top plate 1 are detachably connected, so that the test fixture provided in this embodiment can also be used to test the water vapor transmission performance of the same gas diffusion layer 4 under different flow field areas 31, which is conducive to further expanding the scope of application of the test fixture.

[0074] In one possible implementation, the staff first measures the weight of the base plate 2 for the first time before assembling the test fixture, and records the result of the first measurement as G1, where G1 is the weight of the base plate 2; after the test of the water vapor transmission performance of the gas diffusion layer 4 is completed, the test fixture is dismantled, and then the weight of the base plate 2 is measured for the second time, and the result of the second measurement is recorded as G2, where G2 is the weight of the base plate 2 and the deposition liquid; finally, the results of the two measurements are subtracted to obtain the weight G3 of the deposition liquid, that is, G3=G2-G1.

[0075] In a specific embodiment, Figure 1 , Figure 2 and Figure 5 As shown, along the height direction of the test fixture, a first test area 13 is provided on the side of the top plate 1 facing the gas diffusion layer 4 , and a second test area 23 is provided on the side of the bottom plate 2 facing the gas diffusion layer 4 .

[0076] Among them, the first liquid outlet 111 of the liquid inlet channel 11 and the second liquid inlet 121 of the liquid outlet channel 12 are both arranged in the first test area 13, the air outlet 212 and the groove 22 of the air inlet channel 21 are both arranged in the second test area 23, and the projections of the first liquid outlet 111 of the liquid inlet channel 11 and the air outlet 212 of the air inlet channel 21 along the height direction of the test fixture at least partially overlap.

[0077] In the embodiment of the present application, when the gas diffusion layer 4 is placed in the test fixture, the projection of the permeation zone 41 along the height direction of the test fixture can cover the first test zone 13 and the second test zone 23, so that the permeation zone 41 can cover the first liquid outlet 111 of the liquid inlet channel 11, the second liquid inlet 121 of the liquid outlet channel 12 and the gas outlet 212 of the gas inlet channel 21, thereby increasing the contact area and contact time between the liquid and the gas and the permeation zone 41 during the flow process, so that the test environment of the gas diffusion layer 4 in the test fixture is closer to the working environment in the electrolytic cell, which is beneficial to reduce the error range of the test results and improve the accuracy of the test results.

[0078] Among them, by setting the air outlet 212 of the air inlet channel 21 in the second test area 23, the opening direction of the air outlet 212 of the air inlet channel 21 is consistent with the opening direction of the groove 22 (that is, the air inlet channel 21 and the groove 22 are not connected to each other), and both are facing the direction of the gas diffusion layer 4. Through such a design, the air inlet channel 21 and the groove 22 need to be connected through the gas diffusion layer 4, so as to avoid the risk of part of the sedimentation liquid flowing out of the groove 22 through the air inlet channel 21 due to excessive sedimentation liquid in the groove 22 during the test, thereby ensuring the accuracy and reliability of the test results of the sedimentation liquid weight.

[0079] At the same time, by setting the projections of the first liquid outlet 111 of the liquid inlet channel 11 and the gas outlet 212 of the gas inlet channel 21 in the height direction of the test fixture to at least partially overlap, the flow direction of the liquid after flowing out of the first liquid outlet 111 of the liquid inlet channel 11 is the same as the flow direction of the gas after flowing out of the gas outlet 212 of the gas inlet channel 21. Through such a design, both the liquid and the gas can flow through the complete flow field area 31 and the permeation area 41, so that the flow environment of the liquid and the gas in the test fixture is closer to the flow environment in the electrolytic cell.

[0080] Specifically, when the flow direction of the liquid is opposite to the flow direction of the gas, the gas that penetrates into the flow field area 31 through the permeation area 41 will flow out of the test fixture directly through the liquid outlet channel 12 under the action of the liquid, so that this part of the gas cannot flow through the complete flow field area 31, which can easily cause the gas flow rate measured by the detection device 5 to be too large, and thus have a greater impact on the accuracy of the test results. Therefore, by setting the flow direction of the liquid to be the same as the flow direction of the gas, the error range of the test results can be further reduced and the accuracy of the test results can be improved.

[0081] In a specific embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, along the length and width directions of the test fixture, a first sealing area 14 for accommodating a first seal (not marked in the figure) is further provided on the outer side of the first test area 13, a second sealing area 24 for accommodating a second seal (not marked in the figure) is further provided on the outer side of the second test area 23, and a third sealing area 32 for accommodating a third seal (not marked in the figure) is further provided on the outer side of the flow field area 31.

[0082] The first sealing area 14 , the second sealing area 24 and the third sealing area 32 are all annular structures, and their projections along the height direction of the test fixture overlap.

[0083] In the embodiment of the present application, by setting the first sealing area 14, the second sealing area 24 and the third sealing area 32 of the annular structure, the first sealing area 14 can surround the first test area 13, the second sealing area 24 can surround the second test area 23, and the third sealing area 32 surrounds the flow field area 31, thereby improving the sealing of the first test area 13, the second test area 23 and the flow field area 31, so as to reduce the possibility of leakage of liquid and gas during the test process, thereby improving the stability and reliability of the test fixture during operation.

[0084] Specifically, when the first sealing area 14, the second sealing area 24 and the third sealing area 32 are annular structures, the first sealing member, the second sealing member and the third sealing member installed in each sealing area can also be annular structures to improve the stability and reliability of the connection between each sealing member and each sealing area. In addition, each sealing area can limit each sealing member, so as to reduce the possibility of each sealing member being offset relative to each sealing area during the subsequent lamination process, thereby facilitating the improvement of the sealing performance of the test fixture during the test process.

[0085] Among them, the first seal, the second seal and the third seal can all be an integrally formed structure, so that each seal has a higher structural stability, and compared with the seals formed by segmented connection, the integrally formed seals have better integrity, which is beneficial to further improve the sealing effect between two adjacent plates.

[0086] At the same time, along the height direction of the test fixture, the first seal is located between the top plate 1 and the flow channel plate 3, the second seal is located between the bottom plate 2 and the gas diffusion layer 4, and the third seal is located between the flow channel plate 3 and the gas diffusion layer 4. By arranging a seal between two adjacent plates, the possibility of leakage of the fluid during the flow and / or diffusion process can be reduced, thereby improving the stability of the flow of the fluid during the test process, and further improving the stability and reliability of the test fixture during the working process. When the projections of the first sealing area 14, the second sealing area 24 and the third sealing area 32 along the height direction of the test fixture overlap, the projections of the first seal, the second seal and the third seal along the height direction of the test fixture also overlap, so that the two adjacent seals can clamp the plate between the two seals along the height direction of the test fixture, which is conducive to further improving the sealing effect of the test fixture to ensure the stability and reliability of the test fixture during the working process.

[0087] More specifically, the material of each seal can be one of silicone rubber, fluororubber and EPDM rubber, so that each seal has a strong pressure resistance, which is beneficial to reduce the possibility of each seal being crushed during the lamination process and causing sealing failure, thereby further ensuring the stability and safety of the test fixture during the working process.

[0088] In a specific embodiment, Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, along the length and width directions of the test fixture, a plurality of first positioning holes 15 are provided at intervals on the outer side of the first sealing area 14, a plurality of second positioning holes 25 are provided at intervals on the outer side of the second sealing area 24, a plurality of third positioning holes 33 are provided at intervals on the outer side of the third sealing area 32, and the first positioning holes 15, the second positioning holes 25 and the third positioning holes 33 are aligned along the height direction of the test fixture.

[0089] The test fixture further includes a plurality of positioning members 6 . Along the height direction of the test fixture, each positioning member 6 passes through each first positioning hole 15 , each second positioning hole 25 and each third positioning hole 33 .

[0090] In the embodiment of the present application, by setting a first positioning hole 15 on the top plate 1, a second positioning hole 25 on the bottom plate 2, and a third positioning hole 33 on the flow channel plate 3, the top plate 1, the bottom plate 2, and the flow channel plate 3 can be positioned through the positioning holes on each plate body during the assembly process, which is beneficial to improve the assembly efficiency of the test fixture. At the same time, the test fixture also includes a positioning member 6, and the cooperation between the positioning member 6 and each positioning hole makes the cooperation accuracy between two adjacent plates higher, which is beneficial to improve the overall assembly accuracy of the test fixture.

[0091] Specifically, when the top plate 1, the bottom plate 2 and the flow channel plate 3 are distributed along the height direction of the test fixture, the first positioning hole 15 on the top plate 1, the second positioning hole 25 on the bottom plate 2 and the third positioning hole 33 on the flow channel plate 3 can be aligned along the height direction of the test fixture, so that the positioning member 6 can pass through the first positioning hole 15, the second positioning hole 25 and the third positioning hole 33 along the height direction of the test fixture, thereby realizing rapid stacking between the top plate 1, the bottom plate 2 and the flow channel plate 3, which is beneficial to improving the assembly accuracy and assembly efficiency of the test fixture.

[0092] In a specific embodiment, Figure 4 and Figure 5 As shown, along the length direction and the width direction of the test fixture, a packaging area 42 is further provided outside the penetration area 41 , and the outer edge of the packaging area 42 abuts against each positioning member 6 .

[0093] In the embodiment of the present application, the packaging area 42 can be used to block the diffusion of the fluid from the center to the edge.

[0094] Among them, the packaging area 42 can be an annular structure, so that the packaging area 42 can surround the permeation area 41, thereby reducing the possibility of the fluid diffusing to the edge of the gas diffusion layer 4 during the flow in the permeation area 41, thereby reducing the possibility of the fluid leaking through the gas diffusion layer 4, which is beneficial to further improve the stability and reliability of the test fixture during operation.

[0095] At the same time, during the assembly of the test fixture, the outer edge of the packaging area 42 can abut against each positioning member 6 along the length and width directions of the test fixture, so that the positioning member 6 can play a positioning role on the gas diffusion layer 4, thereby reducing the difficulty of assembling the gas diffusion layer 4 and improving the assembly efficiency of the gas diffusion layer 4.

[0096] In addition, during the subsequent lamination process, the positioning member 6 can also reduce the possibility of the gas diffusion layer 4 moving in the horizontal direction relative to the base plate 2, so that at least part of the projection of the permeation area 41 coincides with the projection of the groove 22 along the height direction of the test fixture, and the second seal and the third seal can clamp the packaging area 42 along the height direction of the test fixture, so that the positioning member 6 can limit the gas diffusion layer 4, and the second seal and the third seal can squeeze the packaging area 42, thereby further improving the sealing effect of the packaging area 42 on the permeation area 41.

[0097] In a specific embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the first liquid outlet 111 of the liquid inlet channel 11 , the second liquid inlet 121 of the liquid outlet channel 12 , and the air outlet 212 of the air inlet channel 21 are all rectangular structures extending along the width direction of the test fixture.

[0098] Along the width direction of the test fixture, the length of the first liquid outlet 111 of the liquid inlet channel 11 is L1, the length of the second liquid inlet 121 of the liquid outlet channel 12 is L2, the length of the air outlet 212 of the air inlet channel 21 is L3, the width of the flow field area 31 is L4, the width of the groove 22 is L5, and L1, L2, L3, L4 and L5 satisfy L4<L1, L4<L2, L5<L3, L1=L2=L3.

[0099] In the embodiment of the present application, by setting the first liquid outlet 111 of the liquid inlet channel 11, the second liquid inlet 121 of the liquid outlet channel 12 and the gas outlet 212 of the gas inlet channel 21 into a rectangular structure, it is beneficial to increase the flow area of ​​each inlet and outlet, so that the liquid and gas can flow into the flow field area 31 and the permeation area 41 more evenly, so that the test environment of the gas diffusion layer 4 in the test fixture is closer to the working environment in the electrolytic cell. In addition, the inlet and outlet of the rectangular structure are easy to process, which is beneficial to reduce the manufacturing difficulty and production cost of the top plate 1 and the bottom plate 2.

[0100] Among them, along the width direction of the test fixture, the length L1 of the first liquid outlet 111 of the liquid inlet channel 11 is greater than the width L4 of the flow field area 31, the length L2 of the second liquid inlet 121 of the liquid outlet channel 12 is greater than the width L4 of the flow field area 31, and the length L3 of the air outlet 212 of the air inlet channel 21 is greater than the width L5 of the groove 22, which is beneficial to improving the efficiency of part of the liquid flowing into the flow field area 31 and improving the efficiency of part of the gas flowing into the groove 22.

[0101] At the same time, the length L1 of the first liquid outlet 111 of the liquid inlet channel 11, the length L2 of the second liquid inlet 121 of the liquid outlet channel 12, and the length L3 of the gas outlet 212 of the gas inlet channel 21 are equal, so that the water vapor transmission performance of the gas diffusion layer 4 can be tested when the inlet and outlet flow areas are equal, so as to eliminate the possibility that other components in the electrolytic cell affect the water vapor transmission performance of the gas diffusion layer 4, which is conducive to further improving the accuracy of the test results.

[0102] In other embodiments, the length L1 of the first liquid outlet 111 of the liquid inlet channel 11 is equal to the length L3 of the gas outlet 212 of the gas inlet channel 21, and both are greater than the length L2 of the second liquid inlet 121 of the liquid outlet channel 12, that is, L2<L1, L2<L3, L1=L3. Through such a design, the gas diffusion layer 4 can be tested for water vapor transmission performance when the inlet and outlet flow areas are not equal, so as to determine the influence of other components in the electrolytic cell on the water vapor transmission performance of the gas diffusion layer 4.

[0103] In a specific embodiment, Figure 5 As shown, the test fixture further includes a first control device 7, one end of the first control device 7 is connected to the detection device 5, and the other end of the first control device 7 is connected to the gas supply equipment. The first control device 7 is used to control the pressure of the gas.

[0104] In the embodiment of the present application, the pressure of the input gas can be controlled by the first control device 7 so that the gas flows through the detection device 5 at a fixed pressure and then flows into the air inlet channel 21, so as to eliminate the influence of different gas pressures on the water vapor transmission performance of the gas diffusion layer 4, so that the final measured result is more accurate.

[0105] In a specific embodiment, Figure 5 As shown, the test fixture further includes a second control device 8, one end of which is connected to the first liquid inlet of the liquid inlet channel 11, and the other end of which is connected to the liquid supply device. The second control device 8 is used to control the flow rate of the liquid.

[0106] In the embodiment of the present application, the flow rate of the input liquid can be controlled by the second control device 8 so that the liquid flows into the liquid inlet channel 11 at a fixed flow rate to eliminate the influence of different liquid flow rates on the water vapor transmission performance of the gas diffusion layer 4, so that the final measured result is more accurate.

[0107] In a specific embodiment, the flow field area 31 is provided with a plurality of flow channels (not shown in the figure), the plurality of flow channels extend along the length direction of the test fixture and are spaced apart along the width direction of the test fixture. The flow channels are straight flow channels or curved flow channels, and the bottom wall of the flow channels is a hollow structure.

[0108] In the embodiment of the present application, by setting up multiple flow channels in the flow field area 31, it is beneficial to improve the uniformity of the fluid after flowing into the flow field area 31, so that the test environment of the gas diffusion layer 4 in the test fixture is closer to the working environment in the electrolytic cell, so as to eliminate the possibility that the uneven fluid flow affects the water vapor transmission performance of the gas diffusion layer 4, which is beneficial to further improve the accuracy of the test results.

[0109] Specifically, the flow channel plate 3 can be processed into a flow channel by punching, so that the bottom wall of the flow channel is a hollow structure. This processing method is conducive to shortening the dimension of the flow channel plate 3 along the height direction of the test fixture, so that the fluid can more easily flow from the permeable layer 41 into the flow field area 31 or from the flow field area 31 into the permeable layer 41 during the flow process, thereby reducing the possibility that the thickness of the flow channel plate 3 affects the water vapor transmission performance of the gas diffusion layer 4, which is conducive to further improving the accuracy of the test results.

[0110] In a possible implementation, the material of the flow channel plate 3 may be stainless steel, which generally improves the structural strength of the flow channel plate 3 while reducing the risk of corrosion of the flow channel plate 3, thereby helping to extend the service life of the flow channel plate 3 and reduce the cost of processing and maintenance of the flow channel plate 3.

[0111] In a specific embodiment, the top plate 1 and the bottom plate 2 are made of glass.

[0112] In the embodiment of the present application, the top plate 1 and the bottom plate 2 can be made of acrylic plates so that the staff can observe the flow of liquid and gas in the test fixture at any time, for example, the distribution of liquid and gas during the flow process, the penetration of liquid and gas in the permeation zone 41, and the capacity of the deposited liquid in the groove 22, etc., so as to facilitate the staff to evaluate the water vapor transmission performance of the gas diffusion layer 4 in combination with the test results.

[0113] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A test fixture for testing a gas diffusion layer, characterized in that: The test fixture comprises: A top plate, wherein the top plate is provided with a liquid inlet channel and a liquid outlet channel, and along the length direction of the test fixture, the liquid inlet channel and the liquid outlet channel are arranged opposite to each other; A bottom plate, the bottom plate being provided with an air inlet channel and a groove, wherein along the length direction of the test fixture, the air inlet channel is located on one side of the groove; A flow channel plate, located between the top plate and the bottom plate along the height direction of the test fixture, and provided with a flow field area, the flow field area being connected with the liquid inlet channel and the liquid outlet channel; A gas diffusion layer, along the height direction of the test fixture, the gas diffusion layer is located between the flow channel plate and the bottom plate, and the gas diffusion layer is provided with a permeable area, the permeable area is communicated with the air inlet channel and covers the groove; Wherein, along the height direction of the test fixture, at least a portion of the projection of the flow field area and at least a portion of the projection of the permeation area both overlap with the projection of the groove; The test fixture is also provided with a detection device, which is connected to the air inlet of the air inlet channel and is used to detect the flow rate of the gas.

2. The test fixture according to claim 1, characterized in that: Along the height direction of the test fixture, a first test area is provided on a side of the top plate facing the gas diffusion layer, and a second test area is provided on a side of the bottom plate facing the gas diffusion layer; The liquid outlet of the liquid inlet channel and the liquid inlet of the liquid outlet channel are both arranged in the first test area, the air outlet of the air inlet channel and the groove are both arranged in the second test area, and the projection of the liquid outlet of the liquid inlet channel and the air outlet of the air inlet channel along the height direction of the test fixture at least partially overlaps.

3. The test fixture according to claim 2, characterized in that: Along the length direction and the width direction of the test fixture, a first sealing area for accommodating a first sealing member is further provided on the outer side of the first test area, a second sealing area for accommodating a second sealing member is further provided on the outer side of the second test area, and a third sealing area for accommodating a third sealing member is further provided on the outer side of the flow field area; The first sealing area, the second sealing area and the third sealing area are all annular structures, and their projections along the height direction of the test fixture overlap.

4. The test fixture according to claim 3, characterized in that: Along the length direction and width direction of the test fixture, a plurality of first positioning holes distributed at intervals are arranged on the outer side of the first sealing area, a plurality of second positioning holes distributed at intervals are arranged on the outer side of the second sealing area, a plurality of third positioning holes distributed at intervals are arranged on the outer side of the third sealing area, and the first positioning holes, the second positioning holes and the third positioning holes are aligned along the height direction of the test fixture; The test fixture further includes a plurality of positioning members, and along a height direction of the test fixture, each of the positioning members penetrates each of the first positioning holes, each of the second positioning holes, and each of the third positioning holes.

5. The test fixture according to claim 4, characterized in that: A packaging area is further provided outside the penetration area along the length direction and the width direction of the test fixture, and the outer edge of the packaging area abuts against each of the positioning members.

6. The test fixture according to any one of claims 1 to 5, characterized in that: The liquid outlet of the liquid inlet channel, the liquid inlet of the liquid outlet channel, and the air outlet of the air inlet channel are all rectangular structures extending along the width direction of the test fixture; Along the width direction of the test fixture, the length of the liquid outlet of the liquid inlet channel is L1, the length of the liquid inlet of the liquid outlet channel is L2, the length of the air outlet of the air inlet channel is L3, the width of the flow field area is L4, the width of the groove is L5, and L1, L2, L3, L4 and L5 satisfy L4<L1, L4<L2, L5<L3, L1=L2=L3.

7. The test fixture according to any one of claims 1 to 5, characterized in that: The test fixture further comprises a first control device, one end of which is connected to the detection device, and the other end of which is connected to a gas supply device, and the first control device is used to control the pressure of the gas.

8. The test fixture according to any one of claims 1 to 5, characterized in that: The test fixture also includes a second control device, one end of which is connected to the liquid inlet of the liquid inlet channel, and the other end of which is connected to the liquid supply device, and the second control device is used to control the flow rate of the liquid.

9. The test fixture according to any one of claims 1 to 5, characterized in that: The flow field area is provided with a plurality of flow channels, the plurality of flow channels extend along the length direction of the test fixture and are spaced apart along the width direction of the test fixture; The flow channel is a straight flow channel or a curved flow channel.

10. The test fixture according to claim 9, characterized in that: The bottom wall of the flow channel is a hollow structure.

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