An open-cathode proton exchange membrane fuel cell stack visualization device

Abstract

The present invention discloses a visualization device for an open cathode proton exchange membrane fuel cell stack, which includes an end plate, a transparent cover plate, a flow field plate, a membrane electrode, fasteners and an air duct. The middle of the end plate is hollowed out, and its inner side wall is closely attached to the transparent cover plate. The flow field plate includes a cathode side plate, a bipolar plate and an anode side plate. Cathode parallel flow channels and anode parallel flow channels are respectively provided on both sides of the bipolar plate. Only cathode parallel flow channels are provided on the cathode side plate, and only anode parallel flow channels are provided on the anode side plate, and the flow channels are all hollowed out. The membrane electrode is sandwiched between the anode side plate and the bipolar plate, between the bipolar plates, and between the bipolar plate and the cathode side plate respectively in a sandwich manner. The fasteners include screws, nuts and gaskets. The present invention can visually observe both the cathode and anode sides of the open cathode proton exchange membrane fuel cell stack at the same time, and can realize the rapid switching of various operating modes, and has the advantages of simple and compact structure, low cost, convenient operation, rich test content and real results, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and particularly relates to a visualization device for an open-cathode proton exchange membrane fuel cell stack. Background Art

[0002] Proton exchange membrane fuel cells are important carriers for the application of hydrogen energy technology. They have the advantages of high efficiency, fast startup, and zero emissions, and have broad application prospects in the fields of transportation, stationary power plants, and portable power sources. Although proton exchange membrane fuel cells have obvious advantages and broad application prospects, some technical challenges still restrict their large-scale promotion, including water management.

[0003] On the one hand, if the water content in the fuel cell is insufficient, the proton conductivity will decrease, thereby reducing the performance of the fuel cell. On the other hand, the water content cannot be too high, otherwise it will cause flooding, blocking the flow channels, gas diffusion layers, and catalyst layers, restricting the mass transfer of reactants, and ultimately leading to a significant decrease in the output performance of the fuel cell. More seriously, flooding may also cause fuel starvation, damaging the original physical structure of the membrane electrode, and seriously threatening the safety and durability of the proton exchange membrane fuel cell. Therefore, reasonable water management is crucial for the efficient operation of proton exchange membrane fuel cells.

[0004] Measuring the water content and water distribution in fuel cells through certain technical means is an important way to optimize the structural design of fuel cells. Common testing techniques include neutron imaging, X-ray imaging, magnetic resonance imaging, and optical visualization. Among them, optical visualization is widely used due to its advantages of simplicity, low cost, and high spatio-temporal resolution. However, the current visualization devices and methods mainly have the following problems: (1) The visualization devices are usually designed to be fully enclosed (i.e., both the cathode and anode are supplied with reaction gases in a sealed manner). This design can be used to study the water management of fully enclosed proton exchange membrane fuel cells, but cannot be used to study the water management of open-cathode proton exchange membrane fuel cells because the structural characteristics and operating characteristics of open-cathode proton exchange membrane fuel cells are significantly different from those of fully enclosed proton exchange membrane fuel cells; (2) The visualization devices usually only contain one fuel cell unit and cannot truly simulate the complex and coupled operating environment in the stack in actual situations, and thus cannot truly reflect the water transport phenomenon in the fuel cell stack; (3) The visualization devices usually only observe the water distribution on one side (especially the cathode side), and cannot observe the water distributions on both the cathode and anode sides at the same time, making it difficult to comprehensively understand the overall water management situation of the fuel cell; (4) The structures and functions of the visualization devices are single, and in addition to studying the water distribution under conventional operating conditions (different temperatures, pressures, flows, loads), more aspects of testing and research cannot be achieved. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present invention proposes a visualization device for an open cathode proton exchange membrane fuel cell stack. The device is simple and compact, capable of simultaneously observing the water distribution on both the cathode and anode sides of the open cathode proton exchange membrane fuel cell stack online, and can realize the free switching of different operating modes and the monitoring of the operating conditions of the fuel cell stack.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A visualization device for an open cathode proton exchange membrane fuel cell, comprising an end plate, a transparent cover plate, a flow field plate, a membrane electrode, fasteners and an air duct. The end plate is located on the outermost side of the device, and its inner surface is in close contact with the transparent cover plate, and the two have the same shape and size. The flow field plate includes a cathode side plate, a bipolar plate and an anode side plate. The bipolar plate is provided with a cathode parallel flow channel and an anode parallel flow channel on both sides respectively. Only the cathode parallel flow channel is provided on the cathode side plate, and the cathode parallel flow channel is directly exposed to the external environment, and oxygen required for the electrochemical reaction of the fuel cell and heat dissipation are provided through the air duct. Only the anode parallel flow channel is provided on the anode side plate, and the anode parallel flow channel is sealed and not directly connected to the external environment. The membrane electrode has the same size as the flow field plate and is sandwiched between the anode side plate and the bipolar plate, between the bipolar plates, and between the bipolar plate and the cathode side plate in a sandwich manner. The fasteners include screws, nuts and gaskets. The screw passes through the screw holes on the transparent cover plate and the end plate, and all components are fastened together by the nut and the gasket, thereby forming a visualization device for an open cathode proton exchange membrane fuel cell stack.

[0008] Furthermore, the material of the end plate is hard metal. Preferably, the material of the end plate is aluminum alloy, which can effectively protect the transparent cover plate and prevent the transparent cover plate from being worn or scratched by the screw or foreign objects, thereby affecting the visualization observation effect. The middle area of the end plate is hollowed out so that external light can enter the flow channel to achieve optical observation. The hollowed-out area is consistent with the corresponding area of the flow field plate, and screw holes are symmetrically provided on both sides of the hollowed-out area so that the screw can pass through.

[0009] Furthermore, the transparent cover plate takes into account high light transmittance and high strength, and the material is a non-conductive transparent material. Preferably, the material of the transparent cover plate is polycarbonate. The transparent cover plate is also symmetrically provided with screw holes having the same position and size as the end plate, and two long gas supply grooves are provided on the inner end surface, which are respectively connected to two gas ports provided at the upper and lower ends of the side surface. The reaction gas (hydrogen) can be supplied into or discharged from the fuel cell stack through any one of the ports.

[0010] Further, the thickness of the bipolar plate is between 2 and 4 mm. At both the upper and lower ends on one side of the bipolar plate, test grooves with a length of 5 - 10 mm, a width of 0.5 - 1.5 mm, and a depth of 1 - 2 mm are machined. Preferably, the size of the test groove is 10×1×2 mm. External wiring terminals can be firmly embedded in the test grooves by means of interference fitting or the like, so as to realize real-time monitoring of the operating conditions of each fuel cell unit.

[0011] Further, the size of the cathode parallel flow channels on the cathode side plate is the same as that of the cathode parallel flow channels on the bipolar plate, but the middle region of the cathode parallel flow channels on the cathode side plate is hollowed out by machining, and the hollowed-out area accounts for 70 - 80% of the flow channel area, so as to ensure that enough light can enter the cathode flow channels on the premise of meeting the structural strength of the cathode side plate.

[0012] Further, the thickness of the anode side plate is generally smaller than that of the cathode side plate, and preferably ranges between 0.5 and 1.5 mm. The size of the anode parallel flow channels on the anode side plate is the same as that of the anode parallel flow channels on the bipolar plate, but the anode parallel flow channels on the anode side plate are completely hollowed out by machining.

[0013] Further, both the cathode side plate and the anode side plate vertically extend upward from the stack, and current connection ports are provided at the corners of the extended areas, which can be directly connected to an external load, thus eliminating the use of a metal current collector plate and further reducing the contact resistance. Moreover, the extended areas can be heated or cooled to achieve cold start or efficient heat dissipation of the stack.

[0014] Further, sealing grooves are provided on both sides of the cathode side plate, the bipolar plate, and the anode plate. The width of the sealing groove is between 1 and 1.5 mm, and the depth is between 0.4 and 0.8 mm.

[0015] Further, two sealing grooves are machined on both sides of the anode side plate to ensure sealing and prevent hydrogen leakage on the anode side.

[0016] Further, the air duct includes a support plate and a fan. The support plate is made of a material with low price and moderate strength. Preferably, the material of the support plate is acrylic. The support plate is provided with screw holes for fixing the fan on the support plate. The left and right sides of the air duct are closely attached to the outer end faces of the end plates, and the upper and lower sides are closely attached to the upper and lower end faces of the end plates, the transparent cover plate, and the flow field plate.

[0017] Further, a heat shrink tube is sleeved on the screw rod to be electrically insulated from other components.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a visualization device for an open-cathode proton exchange membrane fuel cell stack, which realizes the visualization observation of the water distribution in the open-cathode proton exchange membrane fuel cell through a hollowed end plate, a transparent cover plate, and an open flow field structure.

[0020] The present invention provides a visualization device for an open-cathode proton exchange membrane fuel cell stack. By assembling a plurality of fuel cell units together to form a fuel cell stack, it truly simulates the complex and coupled operating environment inside the fuel cell stack, and thus can obtain a more practical water distribution law in the fuel cell, providing more scientific and effective guidance for the water management of the proton exchange membrane fuel cell stack in actual operation.

[0021] The present invention provides a visualization device for an open-cathode proton exchange membrane fuel cell stack. By respectively hollowing out the cathode side plate and the anode side plate on the outermost side of the fuel cell stack, the water distribution in the cathode and anode flow channels can be observed online simultaneously. Compared with conventional visualization devices, more visualization information can be obtained.

[0022] The present invention provides a visualization device for an open-cathode proton exchange membrane fuel cell stack. By heating and cooling the areas where the cathode side plate and the anode side plate extend, the temperature of the fuel cell can be simply and quickly controlled, realizing the cold start and heat dissipation of the fuel cell. In addition, by controlling the opening / closing of the gas ports on the side of the transparent cover plate, the rapid switching of different operating modes can be conveniently achieved, broadening the working conditions and test contents of the visualization device, providing a richer test scenario, and meeting the needs of different visualization observations.

[0023] Compared with existing visualization devices, the present invention has the advantages of simple and compact structure, low cost, convenient operation, rich test contents, and real test results, and can provide more useful and practical information for the research of proton exchange membrane fuel cells, especially the water management of open-cathode proton exchange membrane fuel cells. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall appearance of a visualization device for an open-cathode proton exchange membrane fuel cell stack in an embodiment.

[0025] Figure 2 It is an exploded schematic diagram of the components of a visualization device for an open-cathode proton exchange membrane fuel cell stack in an embodiment.

[0026] Figure 3 It is a schematic diagram of the structure of the end plate in an embodiment.

[0027] Figure 4 It is a schematic diagram of the structure of the transparent cover plate in an embodiment.

[0028] Figure 5Schematic diagram of the front side of the bipolar plate in the embodiment.

[0029] Figure 6 Schematic diagram of the back side of the bipolar plate in the embodiment.

[0030] Figure 7 Schematic diagram of the front side of the cathode side plate in the embodiment.

[0031] Figure 8 Schematic diagram of the back side of the cathode side plate in the embodiment.

[0032] Figure 9 Schematic diagram of the structure of the anode side plate in the embodiment.

[0033] Figure 10 Schematic diagram of the structure of the air duct in the embodiment.

[0034] Figure 11 Exploded view of the air duct support plate in the embodiment.

[0035] Figure 12 Schematic diagram of the visualization test system in the embodiment.

[0036] Figure 13 Schematic diagram of eight typical operating modes in the embodiment.

[0037] Figure 14 Water distribution map on the anode side of the fuel cell observed in the embodiment.

[0038] As shown in the figure: end plate 1, end plate screw hole 1-1, end plate hollowed-out area 1-2, transparent cover plate 2, transparent cover plate screw hole 2-1, transparent cover plate gas groove 2-2, transparent cover plate air inlet hole 2-3, cathode side plate 3, cathode side plate hollowed-out area 3-1, cathode side plate extension area 3-2, wiring port 3-3, membrane electrode 4, bipolar plate 5, bipolar plate gas channel 5-1, bipolar plate cathode side sealing groove 5-2, test groove 5-3, cathode parallel flow channel 5-4, anode parallel flow channel 5-5, anode first sealing groove 5-6, anode second sealing groove 5-7, anode side plate 6, anode side plate hollowed-out area 6-1, anode side plate extension area 6-2, gas port 7-1, gas port 7-2, gas port 7-3, gas port 7-4, screw 8, nut 9, gasket 10, air duct 11, fan 11-1, support plate 11-2, fan fixing screw hole 11-3, screw hole 11-4, upper and lower side support plates 11-5, left and right side support plates 11-6, rear side support plate 11-7, step structure 11-8, hydrogen cylinder 12, pressure reducing valve 13, flow meter 14, open cathode proton exchange membrane fuel cell stack 15, purge valve 16, high-speed camera 17, heating sheet 18, data acquisition instrument 19, computer 20, electronic load 21. Detailed implementation method

[0039] To better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings, but the implementation manners of the present invention are not limited thereto.

[0040] As Figure 1 、 Figure 2 shown, a visualization device for an open cathode proton exchange membrane fuel cell stack mainly includes an end plate 1, a transparent cover plate 2, a cathode side plate 3, a membrane electrode 4, a bipolar plate 5, an anode side plate 6, an air duct 11, gas ports, and fasteners. The end plate 1 is located on the outermost side of the device, and the transparent cover plate 2 is closely attached to the inner wall surface of the end plate 1. A plurality of membrane electrodes 4 and bipolar plates 5 are alternately stacked, and the outermost flow field plates are the cathode side plate 3 and the anode side plate 6 respectively. The cathode side plate 3 and the anode side plate 6 are closely attached to the inner wall surface of the transparent cover plate 2. All components are fastened by screws 8, nuts 9, and gaskets 10.

[0041] As Figure 3 shown, the material of the end plate 1 is aluminum alloy, which is cheap and easy to process. Its length and width dimensions are slightly larger than those of the flow field plate to ensure that all fuel cell units can be covered and uniform stress can be achieved. The middle area of the end plate 1 is hollowed out. The hollowed-out area 1-2 is a rectangular area, and the hollowed-out range is slightly larger than the range occupied by the flow channels on the bipolar plate to eliminate the observation blind area. Three M4 screw holes 1-1 are machined on both sides of the hollowed-out area 1-2 for the screw to pass through.

[0042] As Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 shown, the outer dimensions of the transparent cover plate 2 are the same as those of the end plate 1, and six M4 screw holes 2-1 are also machined at the same positions. Since the structural strength of the transparent cover plate 2 is lower than that of the end plate 1, the thickness of the transparent cover plate 2 is thicker than that of the end plate 1. In this embodiment, the thickness of the end plate 1 is 6 mm, and the thickness of the transparent cover plate 2 is 10 mm. A rectangular gas groove 2-2 is machined on both the upper and lower sides of the transparent cover plate 2. The size of the cross-section of the groove is the same as that of the gas channel 5-1 on the flow field plate, and the depth is 7 mm. Two M4 air inlet holes 2-3 are machined on the side surface of the transparent cover plate. The air inlet holes penetrate from the side surface until they are connected to the gas groove 2-2. The gas ports 7-1, 7-2 are screwed into the two air inlet holes, and the external pipeline is connected to the gas ports, so that the reaction gas (hydrogen) can be supplied into the fuel cell.

[0043] As Figure 5 、 Figure 6As shown, cathode parallel flow channels 5-4 and anode parallel flow channels 5-5 are machined on both sides of the bipolar plate 5 respectively. The width of the cathode parallel flow channel 5-4 is 1.3 mm, the depth is 2 mm, and it runs horizontally. The protrusion between two adjacent cathode parallel flow channels is the ridge of the flow channel, and the width of the ridge is 1 mm. The width of the anode parallel flow channel 5-5 is 1.5 mm, the depth is 1 mm, and it runs vertically. The width of the ridge between two adjacent anode parallel flow channels is 1.8 mm. Gas channels with a cross-sectional area of 18×4 mm are machined at the upper and lower ends of the bipolar plate, so that the reaction gas (hydrogen) entering through the transparent cover plate 2 can be supplied to different fuel cell units. To prevent gas leakage, cathode sealing grooves 5-2, anode first sealing grooves 5-6 and anode second sealing grooves 5-7 are machined on both sides of the bipolar plate 5 respectively. Good sealing of the reaction gas (hydrogen) can be achieved by injecting an appropriate amount of sealant into the sealing grooves or placing appropriate sealing washers. The cathode sealing groove 5-2 surrounds the gas channel 5-1, the width of the sealing groove is 1 mm, and the depth is 0.4 mm. The anode first sealing groove 5-6 and the anode second sealing groove 5-7 concentrically surround the anode parallel flow channel 5-5 to prevent hydrogen leakage. The width of the anode first sealing groove 5-6 is 1.5, the depth is 0.4 mm, and the width of the anode second sealing groove 5-7 is 1 mm, and the depth is 0.4 mm. To monitor key parameters such as the voltage and temperature of the fuel cell unit in real time, a square test groove 5-3 is also machined at the corner of the bipolar plate. By embedding the wiring terminal into the test groove, the state information of the fuel cell unit can be obtained in real time.

[0044] As Figure 7 , Figure 8 shown, the overall structure and dimensions of the cathode side plate 3 are similar to those of the bipolar plate 5. However, only cathode parallel flow channels are machined on the cathode side plate 3, and there are no anode parallel flow channels. The structural dimensions and positions of the cathode parallel flow channels are the same as those of the bipolar plate 5, but the middle area of each flow channel is completely hollowed out. The area of the hollowed-out area 3-1 accounts for about 70%-80% of the whole flow channel, which is used to introduce external light into the cathode flow channel so as to optically observe the water distribution in the cathode flow channel. The cathode side plate 3 extends vertically upward by a part compared with the bipolar plate 5. Different-sized wiring ports 3-3 are provided on the extended area 3-2, and the current of the stack can be collected in the form of thin wires or bolts, thus realizing the function of the current collector plate.

[0045] As Figure 9As shown, the overall structure and dimensions of the anode side plate 6 are also similar to those of the bipolar plate 5. However, only the anode parallel flow channels are machined on the anode side plate 6, without the cathode parallel flow channels. The structural dimensions and positions of the anode parallel flow channels are the same as those of the bipolar plate 5, but each flow channel is completely hollowed out, and the hollowed-out area 6-1 is used to introduce external light into the anode flow channel so as to optically observe the water distribution in the anode flow channel. Similarly, a part of the anode side plate 6 also extends vertically upward as a current collector plate, and the structure and dimensions of the extended area 6-2 are the same as those of the extended area 3-2 of the cathode side plate.

[0046] As Figure 10 , Figure 11 shown, the air duct 11 is composed of a fan 11-1 and a support plate 11-2. The support plate 11-2 is composed of upper and lower side support plates 11-5, left and right side support plates 11-6, and a rear side support plate 11-7. The edges of the upper and lower side support plates 11-5 and the rear side support plate 11-7 are dug to a certain depth to form a stepped structure 11-8. The thickness of the left and right side support plates 11-6 is the same as the width of the stepped structure 11-8. All the support plates are clamped to each other through the stepped structure 11-8 to form a self-supporting effect. Applying an appropriate amount of sealant at the gap can form a stable support structure. Two circular through holes are opened on the rear side support plate 11-7, and their cross-sectional dimensions are the same as the flow cross-sectional dimensions of the fan 11-2. The two fans 11-2 are arranged vertically and fixed to the rear side support plate through 8 screw holes 11-3. Three screw holes 11-4 are opened on the left and right side plates, and the positions of the screw holes are the same as those of the screw holes on the end plate 1 and the transparent cover plate 2, but the diameter is slightly larger to ensure that the screw can pass through and be fastened smoothly.

[0047] As Figure 12 shown is the test system diagram of the open cathode proton exchange membrane fuel cell stack visualization device, and its working process is as follows:

[0048] On the anode side, the hydrogen in the hydrogen cylinder 12 passes through the pressure reducing valve 13 and the flow meter 14 and is supplied to the anode side of the open cathode proton exchange membrane fuel cell stack 15 through the gas port 7-1. A purge valve 16 is arranged after the anode outlet (gas port 7-3) to regularly remove the water and impurities accumulated in the anode flow channel. It should be particularly noted that the open cathode proton exchange membrane fuel cell stack has four gas ports (7-1, 7-2, 7-3, 7-4), and the operation mode of the fuel cell stack can be changed by changing the positions of the hydrogen inlet and outlet. Figure 13Eight typical operating modes are given. On the cathode side, the fan 11-1 blows the air in the external environment into the cathode parallel flow channel 5-4 through the air duct to provide the oxygen required for the electrochemical reaction of the fuel cell and necessary heat dissipation. The electronic load 21 is electrically connected to the cathode side and the anode side of the stack through the wiring ports 3-3 on the cathode side plate 3 and the anode side plate 6. By controlling the working load of the electronic load 21, the change of the operating conditions of the stack can be realized. At the same time, according to the research needs, heating sheets 18 can be pasted on the cathode side plate extension area 3-2 and the anode side plate extension area 6-2. By changing the working voltage of the heating sheet 18, its heating power can be changed, so as to realize the thermal management of the stack. Two high-speed cameras 17 are used to shoot the hollow areas 1-2 of the two end plates 1 of the stack respectively, and the shooting results are as shown in Figure 14 shown. Finally, the collected data such as temperature and voltage and images are transmitted to the computer 20 through the data line, so as to realize the visual observation and analysis of the water distribution in the open cathode proton exchange membrane fuel cell stack.

[0049] The above embodiments are only examples to clearly illustrate the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, various forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the claims of the present invention.

Claims

1. An open-cathode proton exchange membrane fuel cell stack visualization device, characterized in that It includes the following components: an end plate with a hollowed middle area and its inner side wall closely attached to a transparent cover plate; a transparent cover plate with the same shape and size as the end plate, and two long strip-shaped gas supply grooves are opened on its inner end face; a flow field plate, including a cathode side plate, a bipolar plate, and an anode side plate, with a cathode parallel flow channel and an anode parallel flow channel respectively opened on both sides of the bipolar plate; a membrane electrode sandwich-type clamped between the anode side plate and the bipolar plate, between the bipolar plates, and between the bipolar plate and the cathode side plate respectively; fasteners, including screws, nuts, and gaskets, the screws pass through the screw holes on the transparent cover plate and the end plate, and all components are fastened together through the nuts and gaskets; an air duct, including a support plate and a fan, with screw holes opened on the support plate, and the fan is fixed on the support plate; both the cathode side plate and the anode side plate vertically extend upward from the stack, and current connection ports are provided at the corners of the extended area; by heating or cooling the extended area, cold start or efficient heat dissipation of the stack is achieved.

2. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, wherein: The visualization device is aimed at a stack assembled by multiple fuel cell units, and truly simulates the complex and coupled operating environment inside the stack; by adjusting the opening / closing of the gas ports and the working load of the electronic load, rapid switching of different operating modes and monitoring of the stack operating conditions are realized.

3. The visualization device for an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: Test slots are machined at both the upper and lower ends on one side of the bipolar plate; external connection terminals are embedded in the test slots to achieve real-time monitoring of the operating conditions of each fuel cell unit.

4. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: The middle area of the cathode parallel flow channel on the cathode side plate is hollowed out by machining, and the hollowed area accounts for 70 - 80% of the flow channel area.

5. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: The material of the end plate is hard metal.

6. The visualization device for an open cathode proton exchange membrane fuel cell stack according to claim 1, wherein: The material of the end plate is aluminum alloy.

7. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: The material of the transparent cover plate is a non-conductive transparent material.

8. An open cathode proton exchange membrane fuel cell stack visualization device according to claim 1, characterized in that: The material of the transparent cover plate is polycarbonate.

9. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: The thickness of the anode side plate is smaller than that of the cathode side plate.

10. The visualization device of an open cathode proton exchange membrane fuel cell stack according to claim 1, characterized in that: The thickness range of the anode side plate is between 0.5 - 1.5 mm.

11. The visualization device for an open cathode proton exchange membrane fuel cell stack according to claim 1, wherein: Sealing grooves are opened on both sides of the cathode side plate, the bipolar plate, and the anode plate; two sealing grooves are machined on both sides of the anode side plate.

12. An open cathode proton exchange membrane fuel cell stack visualization device according to claim 1, characterized in that: A heat shrink tube is sleeved on the screw for electrical insulation from other components.

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