A large active area multi-channel visualized fuel cell device operable on-line

Abstract

The application provides a large active area multi-channel visual fuel cell device capable of on-line operation, which comprises a transparent end pressing plate, a transparent end plate, a transparent end current collecting plate, a transparent end flow field plate, an MEA membrane electrode, a non-transparent end bipolar plate, a non-transparent end current collecting plate, carbon paper and a non-transparent end pressing plate arranged in sequence, one side of the transparent end plate is provided with a boss, the transparent end current collecting plate and the transparent end pressing plate are respectively provided with a hollow hole I and a hollow hole II matched with the boss, the position of the hollow hole II corresponds to the position of the boss, the boss is embedded in the hollow hole I, the upper surface of the boss is in the same horizontal plane with the upper surface of the transparent end current collecting plate, an observation area is formed, the transparent end flow field plate is provided with a flow field area I, and the position of the flow field area I corresponds to the position of the boss. The technical scheme of the application solves the problems of small active area, single flow channel and incapability of meeting the batch product detection requirement of the prior art visual fuel cell device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell, in particular, especially relates to a kind of on-line operation large active area multi-channel visual fuel cell device. BACKGROUND

[0002] Proton exchange membrane fuel cell can convert chemical energy stored in fuel and oxidant into electrical energy directly, with many advantages such as clean and pollution-free, low noise, easy to start, low working temperature and high energy density, and is widely used in new energy vehicles, power stations, portable power sources and other fields.

[0003] Proton exchange membrane fuel cell generates a large amount of liquid water and gaseous water during operation, and if the liquid water is not discharged in time, it will block the flow channel and diffusion layer pores, cover the catalyst surface, hinder the reaction of reaction gas and catalyst, and reduce the performance of the cell, therefore, it is of great significance to study the generation, distribution and discharge of liquid water on the surface of the diffusion layer in the flow channel of the fuel cell under different operating conditions.

[0004] The formation and distribution of liquid water inside the proton exchange membrane fuel cell are affected by many factors such as temperature, humidity, pressure, current density, reaction area active area size, flow field structure and flow channel size, humidification conditions, etc. Visual fuel cell device is the most intuitive, effective and low-cost method to monitor the generation, distribution and discharge of liquid water. At present, the active area of the single cell corresponding to the actual mass-produced stack product is large, and the flow channel is complex, while the visual fuel cell device mostly uses special small active area MEA membrane electrode and flow field plate with few flow channels, which are different in active area, flow channel number and fluid distribution, resulting in that the visual fuel cell device cannot intuitively and effectively reflect the drainage and distribution of liquid water in the flow field plate area of the actual mass-produced product, and cannot meet the detection needs of large active area and multi-channel of existing mass products. SUMMARY

[0005] In view of the technical problems of the existing visual fuel cell device with small active area, single flow channel and unable to meet the detection needs of mass products, the present application provides a kind of on-line operation large active area multi-channel visual fuel cell device. The present application mainly uses hollow holes opened on transparent current collector plate and transparent end pressure plate, and sets up boss on transparent end plate to form observation area, flexibly sets observation area position according to the detection needs of actual mass product, is not limited by active area size, flow channel structure and size, and achieves the purpose of intuitively detecting liquid water in different areas of flow field online.

[0006] The technical means adopted by the present application are as follows:

[0007] The application discloses a large active area multi-channel visual fuel cell device which can be operated on line, comprising a transparent end pressing plate, a transparent end plate, a transparent end current collecting plate, a transparent end flow field plate, a MEA membrane electrode, a non-transparent end bipolar plate, a non-transparent end current collecting plate, carbon paper and a non-transparent end pressing plate which are sequentially arranged.

[0008] The transparent end plate is provided with a boss, the transparent end current collecting plate and the transparent end pressing plate are respectively provided with a hollow hole I and a hollow hole II which are matched with the boss, the transparent end pressing plate, the transparent end plate, the transparent end current collecting plate and the transparent end flow field plate are sequentially stacked, the position of the hollow hole II corresponds to the position of the boss, the boss is embedded in the hollow hole I, the upper surface of the boss is on the same horizontal plane with the upper surface of the transparent end current collecting plate, and an observation area is formed.

[0009] The transparent end flow field plate is provided with a flow field area I, and a flow channel is arranged in the flow field area I, and the position of the flow field area I corresponds to the position of the boss.

[0010] Further, the MEA membrane electrode is divided into an active area and a non-active area, and the position of the active area corresponds to the position of the flow field area I.

[0011] A fuel inlet, a fuel outlet, an oxidant inlet, an oxidant outlet, a circulating water inlet and a circulating water outlet are arranged on the transparent end plate, and fuel cavity inlets, fuel cavity outlets, oxidant cavity inlets, oxidant cavity outlets, circulating water cavity inlets and circulating water cavity outlets which correspond to the fuel inlet, the fuel outlet, the oxidant inlet, the oxidant outlet, the circulating water inlet and the circulating water outlet are arranged on both sides of the MEA membrane electrode, the transparent end flow field plate, the non-transparent end bipolar plate and the transparent end current collecting plate.

[0012] Further, the non-transparent end bipolar plate is provided with a flow field area II which is matched with the flow field area I, the carbon paper has the same size and shape as the flow field area II, and the carbon paper is not more than the boundary of the flow field area II in the periphery.

[0013] Further, positioning holes are arranged at the four corners of the MEA membrane electrode, the transparent end flow field plate, the non-transparent end bipolar plate, the transparent end current collecting plate, the non-transparent end current collecting plate, the transparent end plate, the transparent end pressing plate and the non-transparent end pressing plate.

[0014] Further, sealing grooves and sealing rubber lines are arranged between the non-transparent end bipolar plate and the non-transparent end current collecting plate, between the non-transparent end bipolar plate and the MEA membrane electrode, between the transparent end flow field plate and the MEA membrane electrode, between the transparent end flow field plate and the transparent end current collecting plate, between the transparent end current collecting plate and the transparent end plate and between the boss and the hollow hole I.

[0015] Further, a high-speed camera with a microscope lens is further included.

[0016] Further, the top end of the non-transparent end collector plate and the transparent end collector plate is respectively provided with a pole.

[0017] Further, a plurality of through holes for mounting fastening studs are arranged on the transparent end pressing plate and the non-transparent end pressing plate.

[0018] Further, the transparent end flow field plate is made of a conductive metal material, the transparent end collector plate and the non-transparent end collector plate are both made of a conductive material with a silver-plated surface, the transparent end plate is made of a non-conductive transparent material, and the transparent end pressing plate and the non-transparent end pressing plate are both made of a non-conductive metal rigid material.

[0019] A detection method of an on-line running large active area multi-channel visual fuel cell device, and the detection steps are as follows:

[0020] S1, place the non-transparent end pressing plate on the pressing machine, insert two positioning rods into the positioning holes, place the sealing rubber line in the corresponding sealing groove, then place the non-transparent end collector plate, carbon paper, non-transparent end bipolar plate, MEA membrane electrode, transparent end flow field plate, transparent end collector plate, transparent end plate and transparent end pressing plate in sequence above the non-transparent end pressing plate, press according to the designed pressure value, and fasten the assembled visual cell by using the stud bolts;

[0021] S2, the transparent end flow field plate side is used as the cathode, the non-transparent end bipolar plate side is used as the anode, the fuel inlet, fuel outlet, oxidant inlet, oxidant outlet, circulating water inlet and circulating water outlet are connected with the fuel cell test bench interface in correspondence, and the pole of the transparent end collector plate and the non-transparent end collector plate is connected with the cathode and anode of the fuel cell test bench respectively;

[0022] S3, after confirming that the connection is correct, start the fuel cell test bench, start the high-speed camera with a microscope lens, and record the generation and discharge of liquid water at the bottom of the cathode diffusion layer flow channel during the running of the visual cell under different working conditions;

[0023] S4, adjust the circulating water to achieve the required temperature of the visual cell during running, and prevent the generation of water mist inside the transparent end plate from affecting the observation.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The application provides a large active area multi-channel visual fuel cell device which can be operated on line, hollow holes are formed on the transparent current collector plate and the transparent end pressing plate, bosses are arranged on the transparent end plate to form an observation area, the position of the observation area is flexibly set according to the detection requirements of actual batch products, is not limited by the size of the active area, the structure and size of the flow channel, the target of intuitively detecting liquid water in different regions of the flow field under different working conditions on line is realized, and the MEA membrane electrode and the bipolar plate are commonly used in batch production, do not need to be specially made, and can be repeatedly used, so that the experimental cost is reduced.

[0026] 2. The application provides a large active area multi-channel visual fuel cell device which can be operated on line, commonly used bipolar plates are used on one side, and the other side is a flow field plate with a hollow structure, the positions of the bipolar plate and the flow field plate are interchanged, the anode and the cathode on one side can be changed, the structure is simple, sealing is good, assembly is easy, the original distribution mode and region of circulating water and reactants in the stack are also reserved, the circulating water can also be accurately and uniformly controlled to control the battery reaction temperature in the experiment, and the observed liquid water discharge process is closer to the actual application situation.

[0027] 3. The application provides a large active area multi-channel visual fuel cell device which can be operated on line, which can not only be operated on line to observe the discharge of liquid water in different regions, but also can observe the generation and discharge process of liquid water on the surface of the diffusion layer of the fuel cell and in the flow field under different operating conditions.

[0028] Based on the above reasons, the application can be widely popularized in the field of fuel cells and the like. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The application provides a large active area multi-channel visual fuel cell device which can be operated on line.

[0031] Figure 2 The application provides a large active area multi-channel visual fuel cell device which can be operated on line.

[0032] Figure 3 The application provides a large active area multi-channel visual fuel cell device which can be operated on line.

[0033] Figure 4 The application provides a large active area multi-channel visual fuel cell device which can be operated on line.

[0034] Figure 5 Schematic diagram of the transparent end flow field plate structure according to the present application.

[0035] Figure 6 Schematic diagram of the transparent end current collector plate structure according to the present application.

[0036] Figure 7 Schematic diagram of the transparent end plate structure according to the present application.

[0037] Figure 8 Schematic diagram of the transparent end compression plate structure according to the present application.

[0038] Figure 9 Schematic diagram of the non-transparent end compression plate structure according to the present application.

[0039] Figure 10 Schematic diagram of the MEA membrane electrode structure according to the present application.

[0040] In the figure: 1, MEA membrane electrode; 2, transparent end flow field plate; 3, non-transparent end bipolar plate; 4, transparent end current collector plate; 5, non-transparent end current collector plate; 6, transparent end plate; 7, carbon paper; 8, transparent end compression plate; 9, non-transparent end compression plate; 16, boss; 17, hollow hole I; 18, hollow hole II; 19, hollowed-out area; 20, flow channel groove; 21, flow channel ridge; 22, flow field area I; 23, flow field area II; 24, active area; 25, through hole; 28, pole; 29, fuel inlet; 30, fuel outlet; 31, oxidant inlet; 32, oxidant outlet; 33, circulating water inlet; 34, circulating water outlet; 35, positioning hole. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. Furthermore, it should be understood that, for ease of description...

[0045] It should be noted that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0046] In all examples shown and discussed, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that...

[0047] To: Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0048] In the description of this invention, it should be understood that directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only used for the convenience of describing this invention and for simplification.

[0049] Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention: the directional terms "inner" and "outer" refer to the inner or outer contours of the respective components themselves.

[0050] 0. For ease of description, spatial relative terms such as "above" can be used here.

[0051] Terms such as "above," "on the upper surface of," and "above" are used to describe the spatial positional relationship of a device or feature as shown in the figure to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figure. For example, if a device in the figure is inverted, a device described as "above" or "on top of other devices or features" will subsequently be positioned as "above other devices or features."

[0052] "Below" or "below" the device or structure in its position. Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0053] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0054] Example 1

[0055] like Figures 1-10 As shown, the present invention provides an online-operable, large-active-area, multi-channel, visualized fuel cell device, comprising: a transparent end flow field plate 2, a transparent end current collector plate 4, a transparent end plate 6, and a transparent end pressure plate 8;

[0056] One side of the transparent end plate 6 is a plane, and the other side is provided with a boss 16. The transparent end current collector 4 and the transparent end pressure plate 8 are respectively provided with hollow holes I17 and II18 that match the boss 16. The transparent end pressure plate 8, the transparent end plate 6 and the transparent end current collector 4 are stacked in sequence. The hollow hole II18 corresponds to the boss 16. The boss 16 is embedded in the hollow hole I17. The upper surface of the boss 16 and the upper surface of the transparent end current collector 4 are on the same horizontal plane to form an observation area.

[0057] The transparent end flow field plate 2 is provided with a flow field region I 22, in which a flow channel is opened. The flow channel includes a flow channel groove 20 and a flow channel ridge 21. The flow channel groove 20 and the flow channel ridge 21 form a hollow area 19. The transparent end flow field plate 2 is placed above the transparent end flow collecting plate 4, so that the flow field region I 22 corresponds to the boss 16.

[0058] MEA membrane electrode 1, non-transparent end bipolar plate 3, non-transparent end current collector 5, carbon paper 7 and non-transparent end pressing plate 9 are sequentially arranged below the transparent end flow field plate 2, the MEA membrane electrode 1 is divided into an active area 24 and a non-active area, and the active area 24 is located in the middle position and corresponds to the flow field area I 22;

[0059] Fuel inlet 29, fuel outlet 30, oxidant inlet 31, oxidant outlet 32, circulating water inlet 33 and circulating water outlet 34 are arranged on the transparent end plate 6, and fuel cavity inlets, fuel cavity outlets, oxidant cavity inlets, oxidant cavity outlets, circulating water cavity inlets and circulating water cavity outlets corresponding to the fuel inlet 29, the fuel outlet 30, the oxidant inlet 31, the oxidant outlet 32, the circulating water inlet 33 and the circulating water outlet 34 are arranged on both sides of the non-active area of the MEA membrane electrode 1, the transparent end flow field plate 2, the non-transparent end bipolar plate 3 and the transparent end current collector 4.

[0060] Further, the flow field area I 22 matches the flow field area II 23 of the non-transparent bipolar plate 3, the hollow area 19 is determined according to the flow field area II 23 to be observed, the carbon paper 7 is the same in size and shape as the flow field area II 23, and the periphery of the carbon paper 7 does not exceed the boundary of the flow field area II 23.

[0061] Further, positioning holes 35 are arranged at the four corners of the MEA membrane electrode 1, the transparent end flow field plate 2, the non-transparent end bipolar plate 3, the transparent end current collector 4, the non-transparent end current collector 5, the transparent end plate 6, the transparent end pressing plate 8 and the non-transparent end pressing plate 9, which facilitates positioning of each component during assembly.

[0062] Further, sealing grooves are arranged between the non-transparent end bipolar plate 3 and the non-transparent end current collector 5, between the non-transparent end bipolar plate 3 and the MEA membrane electrode 1, between the transparent end flow field plate 2 and the MEA membrane electrode 1, between the transparent end flow field plate 2 and the transparent end current collector 4, between the transparent current collector 4 and the transparent end plate 6 and between the boss 16 and the hollow hole I 17, and sealing glue lines are arranged in the sealing grooves, which are used to seal fuel, oxidant and circulating water, so as to prevent gas and liquid from leaking and mixing.

[0063] Further, a high-speed camera with a microscope lens is further included, which is used to shoot and record the generation and exclusion of liquid water at the bottom of the flow channel under different working conditions.

[0064] Further, the MEA membrane electrode 1 is prepared by sequentially hot pressing diffusion layer, catalytic layer, proton exchange membrane, catalytic layer and diffusion layer, and the MEA membrane electrode 1 is a conventional membrane electrode for batch production of electric piles, which is not specially prepared.

[0065] Further, the transparent end flow field plate 2 is made of conductive metal material.

[0066] Further, the transparent end current collector 4 and the non-transparent end current collector 5 are both made of conductive material with silver-plated surface.

[0067] Further, the transparent end plate 6 is made of non-conductive transparent material.

[0068] Further, the transparent end pressing plate 8 and the non-transparent end pressing plate 9 are both made of non-conductive metal rigid material with insulating surface treatment.

[0069] Further, the non-transparent end bipolar plate 3 is a conventional bipolar plate for mass production of electric pile, which is not specially designed.

[0070] Further, the non-transparent end current collector 5 and the upper end of the transparent end current collector 4 are respectively provided with a pole 28, which is used for outputting current.

[0071] Further, the transparent end pressing plate 8 and the non-transparent end pressing plate 9 are both provided with a plurality of through holes 25, which are used for placing stud bolts to fasten the device.

[0072] Further, the middle of the non-transparent end bipolar plate 3 is a circulating water cavity, and the temperature of the device during operation is controlled by the circulating water in the circulating water cavity.

[0073] The boss 16, the hollow hole I 17 and the hollow hole II 18 constitute the observation area of the device, the position of which can be adjusted according to actual needs, and the high-speed camera is used to record the generation and discharge of liquid water in the flow channel through the observation area; the transparent end flow field plate 2 and the non-transparent end bipolar plate 3 can be interchanged to change the positive and negative poles of the visualized battery.

[0074] When the transparent end flow field plate 2 side is anode, the non-transparent end bipolar plate 3 side is cathode, the sealing glue line is used to block the distribution area of oxidant and circulating water between the transparent end flow field plate 2 and the MEA membrane electrode 1, the distribution area of fuel, oxidant and circulating water between the transparent end flow field plate 2 and the transparent end current collector 4, the fuel cavity inlet and the fuel cavity outlet of the non-transparent end bipolar plate 3, so as to ensure that the MEA membrane electrode 1 contacts fuel at the transparent end, the non-transparent end bipolar plate 3 side contacts oxidant, and the circulating water flows in the non-transparent end bipolar plate 3 for regulating the temperature of the battery reaction; when the transparent end flow field plate 2 side is cathode, the non-transparent end bipolar plate 3 side is anode, the sealing glue line is used to block the fuel and circulating water distribution area between the transparent end flow field plate 2 and the MEA membrane electrode 1, and the fuel, oxidant and circulating water distribution area between the transparent end flow field plate 2 and the transparent end current collector 4, so that the MEA membrane electrode 1 contacts oxidant at the transparent end, the non-transparent end of the MEA membrane electrode 1 contacts fuel, and the circulating water flows in the non-transparent end bipolar plate 3 for controlling the temperature of the battery reaction. Fuel enters from the fuel inlet 29, is discharged from the fuel outlet 30 after reaction, oxidant enters from the oxidant inlet 31, is discharged from the oxidant outlet 32 after reaction, and circulating water enters the circulating water cavity from the circulating water inlet 33 and is discharged from the circulating water outlet 34. The distribution area of fuel, oxidant and circulating water between the transparent end flow field plate 2 and the transparent end current collector 4 is blocked, mainly to prevent the leakage and mutual mixing of oxidant, fuel and circulating water from the gap between the transparent end flow field plate 2 and the transparent end current collector 4.

[0075] A detection method of an on-line running large active area multi-channel visual fuel cell device, the specific detection steps are as follows:

[0076] S1, place the non-transparent end pressing plate 9 on the pressing machine, insert two positioning rods into two positioning holes 35, place the sealing glue line in the corresponding sealing groove, then place the non-transparent end current collector 5, carbon paper 7, non-transparent end bipolar plate 3, MEA membrane electrode 1, transparent end flow field plate 2, transparent end current collector 4, transparent end plate 6 and transparent end pressing plate 8 in order above the non-transparent end pressing plate 9, press according to the designed pressure value, and fasten the assembled visual battery using double-headed studs;

[0077] S2, the transparent end flow field plate 2 side is cathode, the non-transparent end bipolar plate 3 side is anode, the fuel inlet 29, fuel outlet 30, oxidant inlet 31, oxidant outlet 32, circulating water inlet 33 and circulating water outlet 34 are connected with the fuel cell test bench interface in correspondence, and the polar column 28 of the transparent end current collector 4 and the non-transparent end current collector 5 is connected with the negative and positive poles of the fuel cell test bench respectively.

[0078] S3, after confirming that the connection is not a problem, starting the fuel cell test bench, starting the high-speed camera with a microscope lens, recording the generation and discharge of liquid water at the bottom of the flow channel of the cathode diffusion layer of the visualized cell under different working conditions through the observation area;

[0079] S4, the visualized cell is adjusted to the required temperature during operation through circulating water, and water mist generated inside the transparent end plate 6 is prevented from affecting the observation.

[0080] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An on-line operable large active area multi-channel visualized fuel cell device, characterized by, The transparent end plate, the transparent end flow field plate, the MEA membrane electrode, the non-transparent end bipolar plate, the non-transparent end current collector plate, the carbon paper and the non-transparent end pressure plate are sequentially arranged. The transparent end plate is provided with a boss, the transparent end current collector plate and the transparent end pressure plate are respectively provided with a hollow hole I and a hollow hole II matched with the boss, the transparent end pressure plate, the transparent end plate, the transparent end current collector plate and the transparent end flow field plate are sequentially stacked, the position of the hollow hole II corresponds to the position of the boss, the boss is embedded in the hollow hole I, the upper surface of the boss is on the same horizontal plane with the upper surface of the transparent end current collector plate to form an observation area. The transparent end flow field plate is provided with a flow field area I, a flow channel is arranged in the flow field area I, and the position of the flow field area I corresponds to the position of the boss. The MEA membrane electrode is divided into an active area and a non-active area, and the position of the active area corresponds to the position of the flow field area I. A fuel inlet, a fuel outlet, an oxidant inlet, an oxidant outlet, a circulating water inlet and a circulating water outlet are arranged on the transparent end plate, and fuel cavity inlets, fuel cavity outlets, oxidant cavity inlets, oxidant cavity outlets, circulating water cavity inlets and circulating water cavity outlets corresponding to the fuel inlet, the fuel outlet, the oxidant inlet, the oxidant outlet, the circulating water inlet and the circulating water outlet are arranged on both sides of the non-active area of the MEA membrane electrode, the transparent end flow field plate, the non-transparent end bipolar plate and the transparent end current collector plate. The positive and negative poles of the visualized battery can be changed by interchanging the transparent end flow field plate and the non-transparent end bipolar plate. When the side of the transparent end flow field plate is the anode, the side of the non-transparent end bipolar plate is the cathode; when the side of the transparent end flow field plate is the cathode, the side of the non-transparent end bipolar plate is the anode. Fuel enters from the fuel inlet, is discharged from the fuel outlet after reaction, oxidant enters from the oxidant inlet, is discharged from the oxidant outlet after reaction, and circulating water enters the circulating water cavity from the circulating water inlet and is discharged from the circulating water outlet.

2. The online-operable, large active area, multi-channel visualizing fuel cell device of claim 1, wherein, The non-transparent end bipolar plate is provided with a flow field area II matched with the flow field area I, the carbon paper has the same size and shape as the flow field area II, and the periphery of the carbon paper does not exceed the boundary of the flow field area II.

3. The online-operable, large active area, multi-channel visualizing fuel cell device of claim 2, wherein, Positioning holes are arranged at the four corners of the MEA membrane electrode, the transparent end flow field plate, the non-transparent end bipolar plate, the transparent end current collector plate, the non-transparent end current collector plate, the transparent end plate, the transparent end pressure plate and the non-transparent end pressure plate.

4. The online operable large active area multi-channel visualizing fuel cell device according to claim 3, wherein, Sealing grooves and sealing glue lines are arranged between the non-transparent end bipolar plate and the non-transparent end current collector plate, between the non-transparent end bipolar plate and the MEA membrane electrode, between the transparent end flow field plate and the MEA membrane electrode, between the transparent end flow field plate and the transparent end current collector plate, between the transparent end current collector plate and the transparent end plate and between the boss and the hollow hole I.

5. The online operable large active area multi-channel visualizing fuel cell device according to claim 4, wherein, A high-speed camera with a microscope lens is further included.

6. The online operable, large active area, multi-channel visualizing fuel cell device of claim 5, wherein, Pole columns are arranged at the top ends of the non-transparent end current collector plate and the transparent end current collector plate.

7. The online operable, large active area, multi-channel visualizing fuel cell device of claim 6, wherein, The transparent end pressing plate and the non-transparent end pressing plate are provided with a plurality of through holes for mounting fastening studs.

8. The online operable large active area multi-channel visualizing fuel cell device according to claim 7, wherein, The transparent end flow field plate is made of conductive metal material, the transparent end current collecting plate and the non-transparent end current collecting plate are made of conductive material with silver plated surface, the transparent end plate is made of non-conductive transparent material, and the transparent end pressing plate and the non-transparent end pressing plate are made of non-conductive metal rigid material.

9. A method for detecting an on-line operable large active area multi-channel visualized fuel cell device, characterized in that, The on-line running large active area multi-channel visual fuel cell device of claim 8 is used for detection as follows: S1, the non-transparent end pressing plate is placed on the pressing machine, two positioning rods are inserted into the positioning holes, the sealing rubber line is placed in the corresponding sealing groove, then the non-transparent end current collecting plate, the carbon paper, the non-transparent end bipolar plate, the MEA membrane electrode, the transparent end flow field plate, the transparent end current collecting plate, the transparent end plate and the transparent end pressing plate are sequentially placed above the non-transparent end pressing plate, the pressure assembly is performed according to the designed pressure value, the assembled visual cell is fastened by using the double-end stud; S2, the transparent end flow field plate side is used as the cathode, the non-transparent end bipolar plate side is used as the anode, the fuel inlet, the fuel outlet, the oxidant inlet, the oxidant outlet, the circulating water inlet and the circulating water outlet are connected with the fuel cell test bench interface, the polar column of the transparent end current collecting plate and the non-transparent end current collecting plate is connected with the cathode and the anode of the fuel cell test bench respectively; S3, after confirming that the connection is correct, the fuel cell test bench is started, the high-speed camera with a microscope lens is started, and the generation and discharge of liquid water at the bottom of the flow channel of the cathode diffusion layer of the visual cell under different working conditions are recorded through the observation area; S4, the temperature required by the visual cell during operation is adjusted by the circulating water, and the generation of water mist in the transparent end plate is prevented to affect the observation.

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