Integrated performance testing device for fuel cell gas diffusion layer material

Abstract

The invention relates to the technical field of fuel cell performance testing, in particular to a fuel cell gas diffusion layer material integrated performance testing device which comprises a carrying table, a first detection module and a second detection module. The second detection module comprises a parallel light generation assembly, a gas disturbance assembly and a second image sensor, through cooperation of the first detection module and the second detection module, preliminary screening of sample ventilation uniformity is achieved through optical light transmission detection, then a suspicious area is verified in the mode that a tracer gas disturbs a parallel light field, and the accuracy of the sample ventilation uniformity is improved. The problem that the local ventilation difference of the gas diffusion layer cannot be detected by an existing differential pressure method is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of fuel cell performance testing technology, specifically to an integrated performance testing device for fuel cell gas diffusion layer materials. Background Technology

[0002] Hydrogen fuel cells, as efficient and clean energy conversion devices, have broad application prospects in new energy vehicles, distributed power generation, and other fields due to their high energy density and zero emissions. The membrane electrode assembly (MEA), as a core component of a hydrogen fuel cell, directly determines the cell's output efficiency and long-term stability. The gas diffusion layer (GDL), a key component of the MEA, is typically made of conductive porous materials such as carbon paper and sandwiched between the bipolar plate flow field and the catalyst layer. It performs multiple core functions: on the one hand, it must uniformly distribute reactant gases such as hydrogen and oxygen to the catalyst layer surface to ensure the electrochemical reaction proceeds fully; on the other hand, it must efficiently remove the water generated during the reaction to avoid electrode flooding, while simultaneously achieving rapid electron and heat conduction. In this process, the permeability of the GDL not only affects the resistance to reactant gas transmission, but its permeability uniformity is also crucial—poor local permeability leads to insufficient reactant gas supply, while excessive local permeability may cause uneven catalyst layer reaction and water accumulation, ultimately severely affecting the fuel cell's output performance and operational stability. Therefore, accurate detection of the GDL permeability uniformity is one of the core requirements for its performance evaluation.

[0003] To meet the aforementioned testing needs, numerous technological explorations have been undertaken in related fields. For example, the fuel cell gas diffusion layer performance testing device disclosed in Chinese Patent Publication No. CN118362478B provides some technical support for GDL performance testing. However, existing testing technologies still have many limitations: some devices use a single differential pressure method, lacking a coordinated process from rapid initial screening to accurate verification. Directly performing high-precision testing leads to low efficiency and makes it difficult to accurately identify local permeability differences. Summary of the Invention

[0004] To address the aforementioned issues, an integrated performance testing device for fuel cell gas diffusion layer materials is provided. Through the coordinated operation of a first detection module and a second detection module, optical transmittance detection is first used to achieve preliminary screening of the gas permeability uniformity of the sample. Then, the suspicious areas are verified by using a tracer gas perturbation parallel light field. This effectively solves the problem that the existing pressure difference method cannot detect local gas permeability differences in the gas diffusion layer.

[0005] To address the problems of existing technologies, this invention provides an integrated performance testing device for fuel cell gas diffusion layer materials, characterized by comprising: a stage for supporting the sample to be tested; a first detection module including a movable light source assembly disposed below the stage and a first image sensor disposed above the stage, wherein the light source assembly moves to sequentially project a detection beam onto different areas of the sample's lower surface, and the first image sensor is used to acquire the light signal after passing through the corresponding area of ​​the sample; a second detection module including a parallel light generating assembly, a gas disturbance assembly, and a second image sensor; the parallel light generating assembly and the second image sensor are disposed opposite each other on the upper sides of the stage, and the parallel light generating assembly is used to form a parallel light field covering the area to be tested on the upper surface of the sample; the gas disturbance assembly is linked with the light source assembly, and the gas disturbance assembly is used to eject tracer gas into the corresponding target local area on the lower surface of the sample, and the tracer gas disturbs the parallel light field after passing through the sample; the second image sensor is used to record the light field disturbance image caused by the gas flow.

[0006] Preferably, a two-dimensional moving platform is also provided below the stage; the gas disturbance component and the light source component are both installed on the two-dimensional moving platform.

[0007] Preferably, the gas disturbance component includes a sealing cover that can slide along the height direction and a nozzle disposed within the sealing cover.

[0008] Preferably, the stage is provided with a grid-shaped support frame, which is used to divide the sample into multiple test areas. Each grid unit on the support frame is provided with a mating groove that matches the sealing cover.

[0009] Preferably, the parallel light generating component includes a point light source and a concave mirror disposed on both sides of the stage. The point light source is located near the focal point of the concave mirror, and an aperture is disposed on the second image sensor. Both the point light source and the second image sensor are located on opposite sides of the concave mirror.

[0010] Preferably, it also includes a control unit, which is electrically connected to the first image sensor, the second image sensor, the light source assembly, and the gas disturbance assembly, respectively. The control unit is configured to: receive an abnormal detection signal output by the first detection module, and control the light source assembly and the gas disturbance assembly to move to a predetermined coordinate based on the abnormal detection signal, and synchronously or sequentially trigger the operation of both the light source assembly (111) and the gas disturbance assembly (122); receive and process the transmitted light signal from the first image sensor and the light field disturbance image from the second image sensor; and calculate the first uniformity and the second uniformity index of the sample based on the differences in the intensity of the transmitted light signal in different regions and the characteristics of the light field disturbance image.

[0011] Preferably, the light source assembly comprises multiple monochromatic light sources or narrow-band light sources arranged in a rectangular array.

[0012] Preferably, the tracer gas used in the gas disturbance component is an inert gas with a refractive index different from that of air.

[0013] Preferably, the platform, the first detection module and the second detection module are provided with protective covers on their outer sides, and the protective covers are provided with openable and closable doors.

[0014] Preferably, the upper surface of the platform is provided with a placement groove, and the support frame is detachably mounted on the placement groove.

[0015] The advantages of this invention compared to the prior art are:

[0016] 1. This invention, through the coordinated operation of a first detection module and a second detection module, first uses optical transmittance detection to achieve preliminary screening of sample permeability uniformity, and then verifies suspicious areas by perturbing a parallel light field with tracer gas. This effectively solves the problem that existing pressure difference methods cannot detect local permeability differences in the gas diffusion layer. The movable light source component of the first detection module can comprehensively cover different areas of the sample, ensuring no omissions in the initial screening process, and the detection method is simple to operate. The second detection module, as a targeted verification method, is activated only when the first detection module detects an anomaly, reducing unnecessary detection steps and improving overall detection efficiency. Simultaneously, the combination of tracer gas and a parallel light field can directly reflect the differences in local permeability performance of the sample, making the detection results more valuable.

[0017] 2. This invention, through the sliding sealing cover that adheres to the lower surface of the sample, reduces the diffusion of tracer gas to the surrounding area, allowing the gas to concentrate its effect on the target local area, making the light field disturbance more reflective of the actual gas permeability in that area. The nozzles inside the sealing cover enable more directional tracer gas injection, which, combined with the synchronous drive of the two-dimensional moving platform, further enhances the targeting and consistency of the detection.

[0018] 3. This invention uses a grid-like support frame to clearly divide the sample into multiple independent testing areas, making the testing process more organized and ensuring that each area can be tested one by one, avoiding omissions. The docking groove under each grid unit matches the sealing cover, further improving the sealing effect of the local space, reducing tracer gas leakage, and allowing the gas to act more concentratedly on the corresponding testing area, so that the test results can better reflect the actual air permeability of that area. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an integrated performance testing device for fuel cell gas diffusion layer materials.

[0020] Figure 2 This is a front view of an integrated performance testing device for fuel cell gas diffusion layer materials.

[0021] Figure 3 This is a three-dimensional structural diagram of the first detection module, the second detection module, and the stage in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0022] Figure 4 This is a top view of the first detection module, the second detection module, and the stage in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0023] Figure 5 This is a cross-sectional structural diagram of the first detection module, the second detection module, and the stage in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0024] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0025] Figure 7 This is a three-dimensional cross-sectional structural diagram of the first detection module, the second detection module, and the stage in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0026] Figure 8 yes Figure 7 Enlarged view of point B in the middle.

[0027] Figure 9 This is a three-dimensional structural diagram of the stage in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0028] Figure 10 This is a top view of a two-dimensional moving platform, a light source assembly, and a gas disturbance assembly in an integrated performance testing device for fuel cell gas diffusion layer materials.

[0029] The diagram is labeled as follows: 1. Stage; 11. First detection module; 111. Light source assembly; 112. First image sensor; 12. Second detection module; 121. Parallel light generation assembly; 1211. Point light source; 1212. Concave reflector; 122. Gas disturbance assembly; 1221. Sealing cover; 1222. Nozzle; 123. Second image sensor; 13. Two-dimensional moving platform; 14. Support frame; 141. Docking groove; 142. Placement groove; 15. Control unit; 16. Protective cover; 161. Door; 2. Sample. Detailed Implementation

[0030] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 2 to 9As shown: An integrated performance testing device for fuel cell gas diffusion layer materials includes: a stage 1 for supporting the material 2 to be tested; a first detection module 11, which includes a movable light source assembly 111 disposed below the stage 1 and a first image sensor 112 disposed above the stage 1, wherein the light source assembly 111 moves to sequentially project a detection beam onto different areas of the lower surface of the material 2, and the first image sensor 112 is used to collect the light signal after passing through the corresponding area of ​​the material 2; and a second detection module 12, which includes a parallel light generating assembly 121 and a gas diffusion layer material. The system includes a volume disturbance component and a second image sensor 123; a parallel light generating component 121 and the second image sensor 123 are disposed opposite each other on the upper sides of the stage 1, the parallel light generating component 121 is used to form a parallel light field covering the area to be measured on the upper surface of the material 2; a gas disturbance component 122 is linked with the light source component 111, the gas disturbance component 122 is used to spray tracer gas into the corresponding target local area on the lower surface of the material 2, the tracer gas disturbs the parallel light field after passing through the material 2; the second image sensor 123 is used to record the light field disturbance image caused by the gas flow.

[0032] First, the material 2 of the fuel cell gas diffusion layer to be tested is placed on the stage 1, ensuring its stability. Upon startup, the first detection module 11 operates first. The movable light source assembly 111 below the stage 1 moves relative to the material 2, projecting the detection beam sequentially onto different areas of the lower surface of the material 2. After the light penetrates the corresponding area of ​​the material 2, it is captured and the light signal is collected by the first image sensor 112 above the stage 1. By comparing the light signals collected by the first image sensor 112 from different areas of the material 2, the consistency of light transmission in each area of ​​the material 2 is initially determined. If the light signal in some areas differs from that in other areas, it is determined that there may be an abnormality in the gas permeability of that area. At this point, the second detection module 12 is activated for further verification.

[0033] In the second detection module 12, the parallel light generating components 121 and the second image sensor 123, which are respectively set on both sides above the stage 1, work together to form a parallel light field covering the area to be tested on the upper surface of the material 2. At this time, the gas disturbance component 122, which is linked with the light source component 111, moves to the suspicious area and the surrounding normal area determined by the first detection module 11, and sprays tracer gas into the corresponding target local area on the lower surface of the material 2. After the tracer gas passes through the material 2, it will disturb the parallel light field above. The second image sensor 123 records the light field disturbance images caused by gas flow in different areas in real time. By comparing the light field disturbance of the abnormal area and the normal area, it is confirmed whether the air permeability of each area of ​​the material 2 is uniform.

[0034] This device, through the coordinated operation of the first detection module 11 and the second detection module 12, first uses optical transmittance detection to achieve preliminary screening of the air permeability uniformity of material 2, and then verifies suspicious areas by perturbing the parallel light field with tracer gas. This effectively solves the problem that existing pressure difference methods cannot detect local air permeability differences in the gas diffusion layer. The movable light source component 111 of the first detection module 11 can fully cover different areas of material 2, ensuring no omissions in the initial screening process, and the detection method is simple to operate. The second detection module 12, as a targeted verification method, is activated only when the first detection module 11 detects an anomaly, reducing unnecessary detection procedures and improving overall detection efficiency. At the same time, the combination of tracer gas and parallel light field can intuitively reflect the differences in local air permeability performance of material 2, making the detection results more valuable.

[0035] like Figure 3 , Figures 5 to 10 As shown: A two-dimensional moving platform 13 is also provided below the stage 1; the gas disturbance component 122 and the light source component 111 are both installed on the two-dimensional moving platform 13.

[0036] The two-dimensional moving platform 13 is preferably a cross slide. After the material 2 to be tested is placed on the stage 1, the two-dimensional moving platform 13 below the stage 1 drives the light source component 111 and the gas disturbance component 122 connected to it to move synchronously. This causes the light source component 111 to project detection beams onto different areas of the lower surface of the material 2 in sequence. The first image sensor 112 collects the corresponding light signals and compares them to determine the consistency of light transmission. If an abnormality is found, the second detection module 12 is activated. At this time, the two-dimensional moving platform 13 continues to drive the gas disturbance component 122 to move synchronously to the suspicious area and the normal area, spraying tracer gas into the corresponding target local area. The tracer gas passes through the disturbed parallel light field of the material 2, and the second image sensor 123 records the disturbance image and compares it to confirm the uniformity of the gas permeability. By installing the light source component 111 and the gas disturbance component 122 together on the two-dimensional moving platform 13, and using the two-dimensional moving platform 13 to drive the synchronous displacement of the two, it is ensured that the detection beam and the tracer gas always accurately correspond to the same target local area, avoiding the positional deviation caused by separate movement, and making the detection connection smoother. The two-dimensional mobile platform 13 has a controllable movement trajectory, which can fully cover the area of ​​material 2 to be tested. It does not require additional complex synchronous control structures, which simplifies the overall device, reduces errors caused by human intervention, keeps the testing conditions in each area consistent, and more clearly reflects the air permeability distribution of material 2, providing more reliable support for material performance evaluation.

[0037] like Figures 3 to 8 As shown: The gas disturbance assembly 122 includes a sealing cover 1221 that can slide along the height direction and a nozzle 1222 disposed within the sealing cover 1221.

[0038] After the material to be tested 2 is placed on the stage 1, the two-dimensional moving platform 13 drives the light source assembly 111 and the gas disturbance assembly 122 to move synchronously to the target area. After the light source assembly 111 completes the light signal acquisition and anomaly judgment, the sealing cover 1221 of the gas disturbance assembly 122 will slide along the height direction until it is in contact with the lower surface of the material 2. The nozzle 1222 in the sealing cover 1221 sprays tracer gas to the corresponding target local area. After the gas passes through the material 2, it disturbs the parallel light field. The second image sensor 123 records the disturbance image and compares and confirms the uniformity of the air permeability.

[0039] By attaching the sliding sealing cover 1221 to the lower surface of material 2, the diffusion of tracer gas to the surrounding area can be reduced, allowing the gas to concentrate on the target local area, making the light field disturbance more reflective of the actual air permeability in that area. The nozzle 1222 inside the sealing cover 1221 makes the tracer gas injection more directional, and with the synchronous drive of the two-dimensional moving platform 13, the targeting and continuity of the detection are further enhanced.

[0040] It should be noted that the material to be tested 2 can be placed on the stage 1 by clamping or other fixing methods, and will not be displaced or lifted during the application of the sealing cover 1221 or gas injection. The sealing cover 1221 adopts a telescopic pipe structure, and a linear actuator for pushing its extension and retraction is configured on the outside of the pipe. The linear actuator can be a cylinder, electric actuator, etc. The sealing cover 1221 can be flexibly slid along the height direction by driving the linear actuator, ensuring that it can be tightly attached to the lower surface of the material 2.

[0041] like Figure 3 , Figures 7 to 9 As shown: A grid-shaped support frame 14 is provided on the stage 1. The support frame 14 is used to divide the material 2 into multiple test areas. Each grid unit on the support frame 14 is provided with a docking groove 141 that matches the sealing cover 1221.

[0042] The grid-like support frame 14 on the stage 1 divides the material 2 into different test areas. The two-dimensional moving platform 13 drives the light source assembly 111 and the gas disturbance assembly 122 to move to each test area in sequence. After the light source assembly 111 completes the light signal acquisition and anomaly judgment of the corresponding area, the sealing cover 1221 slides and docks with the docking groove 141 below the corresponding grid unit and adheres to the lower surface of the material 2. Then, the nozzle 1222 in the sealing cover 1221 sprays tracer gas into the test area. The gas passes through the material 2 to disturb the parallel light field. The second image sensor 123 records the disturbance image. By comparing the detection results corresponding to each grid unit, the uniformity of the gas permeability of the material 2 is confirmed.

[0043] The material 2 is clearly divided into multiple independent test areas by the grid-like support frame 14, making the testing process more organized and ensuring that each area can be tested one by one to avoid omissions. The docking groove 141 under each grid unit matches the sealing cover 1221, which further improves the sealing effect of the local space, reduces tracer gas leakage, and makes the gas act more concentrated on the corresponding test area, so that the test results can better reflect the actual air permeability of the area.

[0044] like Figures 2 to 6 , Figure 9 and Figure 10 As shown: The parallel light generating component 121 includes a point light source 1211 and a concave reflector 1212 disposed on both sides of the stage 1. The point light source 1211 is located near the focal point of the concave reflector 1212. The second image sensor 123 is provided with an aperture, and the point light source 1211 and the second image sensor 123 are both located on opposite sides of the concave reflector 1212.

[0045] After the material under test 2 is fixed on the stage 1, the point light source 1211 of the parallel light generating component 121 is positioned near the focal point of the concave reflector 1212. The light emitted by the point light source is reflected by the concave reflector 1212 to form a uniform collimated light field, which passes through the test area containing the material 2. After the first detection module 11 completes the acquisition of light signals and anomaly judgment in each area, the gas disturbance component 122 sprays tracer gas into the corresponding target local area. When the gas flows and diffuses on the surface of the material 2, it causes a local change in the density of the nearby gas medium. When the collimated light passes through this non-uniform gas region for the first time, it undergoes a slight refraction. Since the point light source 1211 and the second image sensor 123 are both located on opposite sides of the concave reflector 1212, the light carrying the initial disturbance information is not directly recorded, but reaches the concave reflector 1212 again and is reflected back. When it passes through the gas field of the same test area for the second time, the deflection effect of the gas density change on the light is superimposed and combined with the first effect. Finally, the beam of light carrying superimposed perturbation information is filtered by the aperture (not shown in the figure) in front of the second image sensor 123. The aperture blocks the undisturbed direct light and only allows the perturbation light that is deflected by the gas density gradient to pass through, forming a high-contrast schlieren image on the second image sensor 123. By comparing the gas density gradient distribution reflected in the schlieren images of each region, the uniformity of the gas permeability of material 2 is confirmed.

[0046] This device employs a single concave mirror 1212 to achieve optical path reflection. Compared to traditional double-sided transmission schlieren systems, this simplifies the optical structure, reduces system assembly and manufacturing costs, and allows for a more compact device layout. The setup, where light passes through the gas field twice, effectively accumulates and amplifies the minute deflection effects caused by the gas density gradient, improving the sensitivity for detecting weak gas flow or slow diffusion processes. This allows for the capture of more subtle gas dynamic changes under actual working conditions of Material 2. This full-field, non-contact visualization measurement method not only obtains quantitative data on the macroscopic permeability of Material 2 but also visually displays the uniformity of gas flow, diffusion patterns, and potential local blockages or channel effects on the surface and pores of Material 2. It provides two-dimensional spatial distribution information that traditional differential pressure flow methods cannot achieve, enhancing the comprehensiveness of the test.

[0047] like Figures 1 to 3 As shown: It also includes a control unit 15, which is electrically connected to the first image sensor 112, the second image sensor 123, the light source assembly 111, and the gas disturbance assembly 122, respectively. The control unit 15 is configured to: receive the abnormal detection signal output by the first detection module 11, and control the light source assembly 111 and the gas disturbance assembly 122 to move to a predetermined coordinate based on the abnormal detection signal, and trigger the operation of both synchronously or sequentially; receive and process the transmitted light signal of the first image sensor 112 and the light field disturbance image of the second image sensor 123; and calculate the first uniformity and the second uniformity index of the material 2 based on the difference in intensity of the transmitted light signal in different regions and the characteristics of the light field disturbance image.

[0048] After the sample to be tested is fixed to the stage 1 by clamping, the control unit 15 initiates the detection process, controls the light source component 111 to move to the predetermined coordinates and triggers its emission. The first image sensor 112 collects the transmitted light from each region of the material 2 and transmits it to the control unit 15. The control unit 15 processes the light signal, extracts the light intensity data of each region, calculates the light intensity data of all regions, and quantifies the light intensity difference of different regions by statistically analyzing distribution characteristics such as standard deviation, coefficient of variation, or the ratio of range to mean, thereby obtaining the first uniformity index of the material 2. If it is determined that there is an abnormal region in the light intensity data, the control unit 15 continues to control the gas disturbance component 122 to move to the abnormal region, synchronously or sequentially triggering the operation of the light source component 111 and the gas disturbance component 122. The gas disturbance component 122 sprays tracer gas into the target local area, and the second image sensor 123 records the light field disturbance image and transmits it to the control unit 15. The control unit 15 extracts features from the light field disturbance image and obtains image feature parameters such as gray value distribution, disturbance contrast, and area ratio of disturbance regions in each region of material 2. By analyzing the spatial distribution differences of these parameters, a statistical analysis method similar to the first uniformity index is used to quantify the disturbance differences in different regions and obtain the second uniformity index of material 2. The uniformity of the air permeability of material 2 is confirmed by combining the first uniformity index and the second uniformity index.

[0049] The control unit 15 automates the detection process, precisely controlling the movement of the light source assembly 111 and the gas disturbance assembly 122 to predetermined coordinates, reducing positional deviations caused by human intervention and making the detection process more standardized. The synchronous or sequential triggering of components ensures coordinated operation of light signal acquisition and gas injection, improving detection efficiency. The control unit 15's centralized reception and processing of transmitted light signals and light field disturbance images quickly converts them into quantified first and second uniformity indices, making the detection results more objective and comparable. The combination of these two uniformity indices reflects the permeability of material 2 from different dimensions, further refining the detection system and making the judgment results more comprehensive and reliable. It also simplifies the complexity of the detection operation and reduces the impact of human intervention on the results.

[0050] like Figures 3 to 6 , Figure 9 and Figure 10 As shown: The light source assembly 111 includes multiple monochromatic light sources or narrow-band light sources arranged in a rectangular row.

[0051] Multiple monochromatic or narrow-band light sources arranged in a rectangular array within the light source assembly 111 project detection beams onto different areas of the lower surface of material 2 during movement. The light penetrates the corresponding area of ​​material 2 and is captured by the first image sensor 112 above the stage 1. By comparing the light signals from different areas, the transmittance consistency of each area of ​​material 2 is initially determined. If a difference in light signal is found between some areas and other areas, the second detection module 12 is activated. The arrangement of multiple monochromatic or narrow-band light sources in a rectangular array ensures uniform and comprehensive coverage of the lower surface of material 2 by the detection beams, avoiding potential illumination dead zones or uneven intensity issues caused by a single light source, and ensuring stable and consistent illumination conditions for each test area. The monochromatic or narrow-band characteristics effectively reduce stray light interference, improve the purity and stability of the transmitted light signal, and allow the light signal collected by the first image sensor 112 to more accurately reflect the transmittance of material 2, providing a reliable basis for the initial uniformity assessment. This light source layout can also work with the moving mechanism to quickly cover the entire area of ​​material 2 to be tested, ensuring comprehensive testing while improving testing efficiency, further strengthening the synergistic effect between the first testing module 11 and the second testing module 12, making the overall testing results more credible, and providing more solid technical support for the evaluation of the air permeability uniformity of material 2.

[0052] like Figures 3 to 9 As shown: The tracer gas used in the gas disturbance component 122 is an inert gas with a refractive index different from that of air.

[0053] By selecting an inert gas with a refractive index different from air as the tracer gas, the flow and diffusion of the gas after passing through material 2 can more easily induce light field disturbances, allowing the second image sensor 123 to capture the disturbance signal more clearly and improving the detection accuracy. The inert gas is chemically stable and will not react with the test material 2 or the surrounding environment, avoiding interference from changes in the gas's properties or chemical reactions on the detection results. It also will not contaminate material 2, ensuring the stability of the detection process and the integrity of material 2. Simultaneously, the stable and controllable flow state of the inert gas reduces detection errors caused by gas fluctuations, allowing the light field disturbance image to more accurately reflect the local permeability of material 2, further enhancing the reliability of the verification results of the second detection module 12, and forming a more complete detection system in conjunction with the first detection module 11.

[0054] like Figures 1 to 5 As shown: The platform 1, the first detection module 11 and the second detection module 12 are provided with a protective cover 16 on their outer sides, and the protective cover 16 is provided with an openable door 161.

[0055] The protective cover 16 effectively blocks interference from external environmental factors such as dust and airflow, providing a stable internal environment for the detection process. This prevents external airflow from affecting the flow state of the tracer gas or the stability of the collimated light field, ensuring the accuracy of the detection results. Simultaneously, the openable door 161 facilitates the placement and removal of material 2, making operation convenient. Furthermore, the protective cover 16 protects the internal detection module and moving components, reducing the impact of external collisions or contamination on the equipment, extending its service life. It also prevents safety hazards caused by gas leaks or component movement during the detection process, improving operational safety.

[0056] like Figures 3 to 9 As shown: The upper surface of the platform 1 is provided with a placement groove 142, and the support frame 14 is detachably mounted on the placement groove 142.

[0057] The placement slot 142 on the surface of the stage 1 provides precise installation positioning for the support frame 14, ensuring that the grid division of the support frame 14 is consistent with the movement path of the detection module and the docking position of the sealing cover 1221. This avoids deviations in the detection area due to displacement of the support frame 14, thus improving detection accuracy. The detachable design of the support frame 14 gives the device good versatility. Support frames 14 with different grid specifications can be replaced according to detection needs, adapting to materials 2 of various sizes and detection accuracy requirements without replacing the entire stage 1, reducing usage costs. At the same time, the cooperation between the placement slot 142 and the detachable support frame 14 simplifies installation and disassembly operations, improves the efficiency of detection preparation, and ensures the consistency of the position of the support frame 14 after each installation, keeping the detection conditions of different batches of materials 2 uniform and improving the comparability of detection results.

[0058] The material to be tested 2 is fixed on the support frame 14 by clamping. Combined with the positioning function of the placement groove 142 on the support frame 14, the material 2 will not be displaced or lifted during the test, ensuring the stability of the test conditions in each test area and further improving the accuracy and reliability of the test results.

[0059] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. An integrated performance testing device for fuel cell gas diffusion layer materials, characterized in that, The application relates to a sample testing device. The device comprises: a carrier (1) for supporting a sample (2) to be tested; a first detection module (11) comprising a movable light source assembly (111) arranged below the carrier (1) and a first image sensor (112) arranged above the carrier (1); the light source assembly (111) moves to sequentially project a detection light beam to different regions on the lower surface of the sample (2), and the first image sensor (112) is used for collecting light signals after the sample (2) in the corresponding region; a second detection module (12) comprising a parallel light generating assembly (121), a gas disturbance assembly (122) and a second image sensor (123); the parallel light generating assembly (121) and the second image sensor (123) are arranged on the two sides above the carrier (1) in a parallel manner, the parallel light generating assembly (121) is used for forming a parallel light field covering the region to be tested on the upper surface of the sample (2); the gas disturbance assembly (122) is connected with the light source assembly (111), and the gas disturbance assembly (122) is used for spraying a tracer gas to a corresponding target local region on the lower surface of the sample (2), the tracer gas disturbs the parallel light field after passing through the sample (2); 2. The device according to claim 1, wherein the second image sensor (123) is used for recording the light field disturbance image caused by the gas flow.

3. The device of claim 2, wherein A two-dimensional moving platform (13) is further arranged below the carrier (1); the gas disturbance assembly (122) and the light source assembly (111) are both installed on the two-dimensional moving platform (13).

4. The apparatus according to claim 3, wherein The gas disturbance assembly (122) comprises a sealed cover (1221) capable of sliding in the height direction and a nozzle (1222) arranged in the sealed cover (1221).

5. The device of claim 1, wherein A support frame (14) in a grid shape is arranged on the carrier (1), the support frame (14) is used for separating the sample (2) into multiple test regions, and a butt joint groove (141) matched with the sealed cover (1221) is arranged below each grid unit of the support frame (14). The parallel light generating assembly (121) comprises a point light source (1211) arranged on the two sides of the carrier (1) and a concave mirror (1212), the point light source (1211) is located near the focal point of the concave mirror (1212), a diaphragm is arranged on the second image sensor (123), and the point light source (1211) and the second image sensor (123) are both located on the opposite side of the concave mirror (1212).

6. The device according to any one of claims 1 to 5, wherein The control unit (15) is electrically connected with the first image sensor (112), the second image sensor (123), the light source assembly (111) and the gas disturbance assembly (122) respectively, and is configured to: after receiving the abnormality detection signal output by the first detection module (11), control the light source assembly (111) and the gas disturbance assembly (122) to move to a predetermined coordinate based on the abnormality detection signal, and synchronously or sequentially trigger the light source assembly (111) and the gas disturbance assembly (122) to work; receive and process the transmission light signal of the first image sensor (112) and the light field disturbance image of the second image sensor (123); and calculate the first uniformity and the second uniformity of the sample (2) based on the transmission light signal intensity difference of different regions and the light field disturbance image features.

7. The device according to any one of claims 1 to 5, wherein The light source assembly (111) comprises a plurality of monochromatic light sources or narrow-band light sources arranged in a rectangular array.

8. The device according to any one of claims 1 to 5, wherein The tracer gas used by the gas disturbance assembly (122) is an inert gas different from air in refractive index.

9. The device according to any one of claims 1 to 5, wherein The outer side of the stage (1), the first detection module (11) and the second detection module (12) is provided with a protective cover (16) provided with a openable and closable door body (161).

10. The apparatus according to claim 4, wherein The upper surface of the stage (1) is provided with a placing groove (142), and the support frame (14) is detachably arranged on the placing groove (142).

Images