Device for detecting deformation of carbon paper of hydrogen fuel cell
By directly observing the deformation of carbon paper inside the fuel cell stack using a universal testing machine and optical detection technology, the problem of accurately simulating carbon paper deformation in existing technologies is solved, thus improving the accuracy and feasibility of fuel cell stack design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2026-04-07
AI Technical Summary
Existing technologies cannot effectively observe and simulate the actual deformation of carbon paper inside the stack of hydrogen fuel cells, resulting in limited guidance on battery performance and lifespan.
A universal testing machine was used to simulate the internal mechanical environment of the fuel cell stack. Combined with optical detection technology, the morphological changes of the carbon paper in the flow channel were directly observed through a video extensometer and a microscope. A focused light source was used to provide brightness, and the deformation of the carbon paper was photographed and recorded by a microscope.
This enables direct observation of the actual deformation of carbon paper inside the fuel cell stack, improving the accuracy and feasibility of fuel cell stack design and correcting existing mechanical simulation models.
Smart Images
Figure CN224095113U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to fuel cell technical field especially relates to a hydrogen fuel cell carbon paper deformation detection device. BACKGROUND
[0002] As one of the core components of hydrogen fuel cells, carbon paper bears key functions such as gas diffusion, electron conduction, water management, mechanical support, heat conduction and corrosion resistance. As a porous material woven from carbon fibers, carbon paper will undergo compression deformation under the action of packaging force, and its electrical conductivity, thermal conductivity and mass transfer properties will change, directly affecting the performance and life of the battery. However, since the carbon paper is packaged inside the stack, its real state in the stack cannot be explored; after the stack is disassembled, the carbon paper deformation recovers, which is significantly different from the state in the stack. Existing research often simulates the changes of carbon paper in the stack through finite element analysis, but there is no verification method for the authenticity and accuracy of the results, and the guiding significance for product development is limited.
[0003] Patent application CN115718045A discloses a GDL compression durability test device and method, the test device includes an upper pressing plate and a lower pressing plate, the gas diffusion layer to be tested is arranged between the upper pressing plate and the lower pressing plate, a gear is arranged above the upper pressing plate for driving the upper pressing plate to move downward. However, this test device mainly realizes rapid and repeated flat plate compression of the gas diffusion layer by the upper and lower pressing plates and the rapidly self-rotating gear to verify the durability of the carbon paper, but it cannot observe the deformation of the carbon paper assembled on the flow channel structure under fixed stress.
[0004] Patent CN114839115B discloses a carbon paper compression drainage test tool for hydrogen fuel cells, which includes an upper module, a lower module, a fastening bolt and a nut, the fastening bolt passes through the guide holes of the lower module and the upper module in sequence and connects the nut to fix the upper module and the lower module to each other, the lower surface of the upper module is provided with a flow channel structure, the top surface or the side surface of the upper module is provided with a water inlet, a water outlet, an air vent and a pressure test port which are connected to the flow channel structure, the flow channel structure is close to a first observation end of the upper module, the upper surface of the lower module is provided with a placement groove corresponding to the position of the flow channel structure, one side of the placement groove extends to a second observation end of the lower module, the first observation end and the second observation end jointly form a test observation window, and a transparent protective plate is arranged outside the observation window. It can be seen that the carbon paper compression drainage test tool controls the compression ratio by the fastening bolt, clamps the carbon paper by the flow channel structure installed on the surface of the lower module, and observes the drainage of the carbon paper under different compression ratios through the observation window with the transparent protective plate. However, the compression ratio of single-layer carbon paper is difficult to control accurately by the bolt, and the device is a flow channel-carbon paper-light plate structure, which cannot simulate the real stacking structure of carbon paper in the stack. UTILITY MODEL CONTENTS
[0005] In order to solve the above problems, the utility model provides a kind of hydrogen fuel cell carbon paper deformation detection device, by universal testing machine simulation in-pile mechanical environment, the real morphological change of carbon paper in flow passage is directly observed by optical detection technology, it is favorable to improve the cognition to the internal structure of electric pile, guide electric pile design.
[0006] The technical scheme adopted by the utility model is as follows:
[0007] A kind of hydrogen fuel cell carbon paper deformation detection device, including: universal testing machine, experimental briquetting, experimental cushion block, polar plate carbon paper stack structure, video extensometer, convergent light source and microscope;The polar plate carbon paper stack structure is arranged between experimental briquetting and experimental cushion block, the universal testing machine is configured to provide continuously changing packaging force, and the packaging force is evenly transmitted to polar plate carbon paper stack structure by experimental briquetting and experimental cushion block, i.e. simulate the mechanical environment of carbon paper in electric pile interior;The convergent light source is configured to provide brightness, and the video extensometer and microscope are configured to observe the morphological change of carbon paper in polar plate carbon paper stack structure after continuous stress.
[0008] Further, the polar plate carbon paper stack structure includes single polar plate and carbon paper, simulates the assembly mode of carbon paper in electric pile interior.
[0009] Further, the flow passage structure of single polar plate in the polar plate carbon paper stack structure can be adjusted, simulates different C / L or electric pile interior misplacement, wherein C / L is the ratio of flow passage width and ridge width.
[0010] Further, the experimental briquetting and experimental cushion block are respectively engraved with mark line.
[0011] Further, the video extensometer is configured to record the gauge length of mark line, to obtain the compression change thickness of two layers of carbon paper in polar plate carbon paper stack structure under the action of packaging force.
[0012] Further, the microscope is configured to photograph the deformation condition of carbon paper in polar plate carbon paper stack structure after reaching each target pressure, and record corresponding pressure value and displacement value.
[0013] Further, the convergent light source is arranged at the back of observation area, and the microscope is arranged at the front of observation area.
[0014] Further, the experimental briquetting and experimental cushion block are provided with positioning hole, so that the edge of polar plate carbon paper stack structure is aligned.
[0015] Further, the main body contact surface of experimental briquetting and experimental cushion block is square.
[0016] Further, the clamp on experimental briquetting and experimental cushion block is replaceable structure.
[0017] The hydrogen fuel cell carbon paper deformation detection device has the advantages that:
[0018] 1. When the carbon paper is assembled in the electric pile, its real existing state cannot be detected, and the carbon paper deformation recovers after the pile is disassembled, which is greatly different from the state in the pile. The hydrogen fuel cell carbon paper deformation detection device can simulate the pressure deformation process and state of the carbon paper in the electric pile, directly observe the deformation form of the carbon paper under different flow channel design and packaging force, and effectively correct the existing mechanical simulation model.
[0019] 2. The hydrogen fuel cell carbon paper deformation detection device has simple structure, high executability, intuitive result, can effectively correct the existing mechanical simulation model, and guides the electric pile design. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a hydrogen fuel cell carbon paper deformation detection device schematic view of the utility model.
[0021] Figure 2 is a polar plate carbon paper stacking structure schematic view of the utility model.
[0022] Figure 3 is an experimental pressing block, gasket and polar plate carbon paper stacking structure assembly method schematic view of the utility model.
[0023] Figure 4 is a positioning hole arrangement schematic view of the utility model.
[0024] Reference signs: 1- universal testing machine, 2- experimental pressing block, 3- experimental gasket, 4- polar plate carbon paper stacking structure, 5- video extensometer, 6- convergent light source, 7- microscope. DETAILED DESCRIPTION
[0025] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific embodiments of the utility model will be described. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model, that is, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0026] For example, Figure 1As shown, the present embodiment provides a hydrogen fuel cell carbon paper deformation detection device, which comprises a universal testing machine 1, an experimental pressing block 2, an experimental cushion block 3, a polar plate carbon paper stacking structure 4, a video extensometer 5, an aggregated light source 6 and a microscope 7; the polar plate carbon paper stacking structure 4 is arranged between the experimental pressing block 2 and the experimental cushion block 3, the universal testing machine 1 is configured to provide a continuously changing packaging force, and the packaging force is uniformly transmitted to the polar plate carbon paper stacking structure 4 through the experimental pressing block 2 and the experimental cushion block 3, that is, the mechanical environment of the carbon paper in the stack is simulated; the aggregated light source 6 is configured to provide brightness, and the video extensometer 5 and the microscope 7 are configured to observe the morphological changes of the carbon paper in the polar plate carbon paper stacking structure 4 after being continuously stressed.
[0027] Preferably, as Figure 2 As shown, the present embodiment provides an enlarged view of a polar plate carbon paper stacking structure 4, which is stacked by a square single polar plate-two layers of carbon paper of equal size-single polar plate, simulating the assembly mode of the carbon paper in the stack, and the influence of different C / L or internal misalignment of the stack can be simulated by changing the design of the single polar plate flow channel, wherein C / L is the ratio of the flow channel width to the ridge width.
[0028] It should be noted that the polar plate carbon paper stacking structure 4 is not limited to the structure of double-layer single polar plate+double-layer carbon paper, and a single-layer single polar plate+single-layer carbon paper structure can also be used to detect single-side sagging to avoid the influence of the misalignment of the upper and lower polar plates in the stack.
[0029] Preferably, through the positioning holes on the experimental pressing block 2 and the experimental cushion block 3, the position is seen Figure 4 , which can ensure the edge alignment of the polar plate carbon paper stacking structure 4 and facilitate the observation of the deformation of the carbon paper under pressure. The final assembly mode of the experimental pressing block 2, the experimental cushion block 3 and the polar plate carbon paper stacking structure 4 is shown in Figure 3 .
[0030] Preferably, a mark line is drawn in the central part of the experimental pressing block 2 and the experimental cushion block 3, and the initial gauge length is recorded by the video extensometer 5 after the carbon paper is stressed; then the displacement at each target pressure point is monitored, which is the compression change thickness of the two layers of carbon paper under the action of force.
[0031] Preferably, an aggregated light source 6 is arranged right behind the observation area to provide brightness, so that the pictures taken by the microscope 7 can clearly distinguish the carbon paper, the flow channel and the polar plate structure. The front is observed by the microscope 7, the deformation of the carbon paper under pressure invading the flow channel is photographed after reaching each target pressure, and the corresponding pressure value and displacement value are recorded. The aggregated light source 6 and the microscope 7 can be moved left and right to photograph the sagging of the carbon paper at different positions. Finally, the photographed images are processed morphologically to obtain the compression change thickness of the carbon paper under different stress, the area ratio of the carbon paper invading the flow channel under pressure, the edge line shape and the corner of the sagging edge, and other related parameters.
[0032] Preferably, the main contact surface of the experimental pressing block 2 and the experimental cushion block 3 is square; the clamps on the experimental pressing block 2 and the experimental cushion block 3 are replaceable structures; through the design of the inner positioning hole on the experimental pressing block 2 and the experimental cushion block 3, the assembly accuracy of the polar plate and the carbon paper can be ensured.
[0033] Specifically, the use method of the hydrogen fuel cell carbon paper deformation detection device includes:
[0034] The polar plate carbon paper stack structure 4 is placed on the experimental cushion block 3, and the positioning rod is inserted to align the edge of the structure;
[0035] The universal testing machine 1 slowly applies pressure, and the video extensometer 5 records the initial gauge length after the experimental pressing block 2 and the polar plate carbon paper stack structure 4 are in contact and stressed;
[0036] A concentrated light source 6 is arranged directly behind the observation area to provide brightness, and a microscope 7 is used to observe directly in front, so that the deformation of the carbon paper under pressure and into the flow channel is photographed, and the corresponding pressure value and the displacement value of the video extensometer 5 are recorded;
[0037] Finally, the photographed images are processed to obtain the compression thickness of the carbon paper under different stresses, the area ratio of the flow channel under pressure, the edge line shape and the corner of the depression, and other related parameters.
[0038] It should be noted that the upper clamp of the experimental pressing block 2 can be divided into two parts, made of high-hardness material, and regularly checked and replaced to avoid deformation, because it is clamped by the clamp of the universal testing machine 1 for a long time.
[0039] In summary, the universal testing machine and the tooling simulate the mechanical environment of the carbon paper in the stack, and the video extensometer and the microscope can directly observe the morphological changes of the carbon paper after being continuously stressed in the polar plate with different flow channel designs.
[0040] The above only describes the preferred embodiments of the present application, and it should be understood that the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concepts described herein by the above teachings or related technologies or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the appended claims of the present application.
Claims
1. A device for detecting carbon paper deformation in hydrogen fuel cells, characterized in that, include: The apparatus includes a universal testing machine (1), a test block (2), a test pad (3), a carbon paper stack structure (4), a video extensometer (5), a focused light source (6), and a microscope (7). The carbon paper stack structure (4) is located between the test block (2) and the test pad (3). The universal testing machine (1) is configured to provide continuously varying encapsulation force and to uniformly transfer the encapsulation force to the carbon paper stack structure (4) through the test block (2) and the test pad (3), thereby simulating the mechanical environment of the carbon paper inside the fuel cell. The focused light source (6) is configured to provide brightness. The video extensometer (5) and the microscope (7) are configured to observe the morphological changes of the carbon paper in the carbon paper stack structure (4) after continuous stress.
2. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The electrode carbon paper stack structure (4) includes a single electrode plate and carbon paper, simulating the assembly method of carbon paper inside the fuel cell stack.
3. The hydrogen fuel cell carbon paper deformation detection device according to claim 2, characterized in that, The flow channel structure of the single plate in the electrode carbon paper stack structure (4) can be adjusted to simulate different C / L ratios or internal misalignment of the stack, where C / L is the ratio of the flow channel width to the ridge width.
4. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The experimental pressure block (2) and the experimental pad block (3) are respectively engraved with marking lines.
5. The hydrogen fuel cell carbon paper deformation detection device according to claim 4, characterized in that, The video extensometer (5) is configured to record the gauge length of the marker line to obtain the thickness change of the two layers of carbon paper in the electrode carbon paper stack structure (4) under the action of the sealing force.
6. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The microscope (7) is configured to photograph the deformation of the carbon paper in the carbon paper stack structure (4) under pressure after each target pressure is reached, and to record the corresponding pressure value and displacement value.
7. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The focused light source (6) is positioned directly behind the observation area, and the microscope (7) is positioned directly in front of the observation area.
8. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The experimental pressure block (2) and experimental pad block (3) are provided with positioning holes to align the edges of the electrode carbon paper stack structure (4).
9. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The main contact surfaces of the experimental pressure block (2) and the experimental pad block (3) are square.
10. The hydrogen fuel cell carbon paper deformation detection device according to claim 1, characterized in that, The clamps on the experimental pressure block (2) and the experimental pad block (3) are replaceable.