CN116031429A - Fuel cell unit cell and polar plate thereof - Google Patents

Abstract

The embodiment of the application discloses a single fuel cell and a polar plate thereof. A fuel cell unit cell including a membrane electrode assembly facing a membrane electrode of the fuel cell; the two gas diffusion layers are respectively attached to two sides of the membrane electrode assembly; and the ridge parts of the two polar plates are respectively attached to the outer sides of the corresponding gas diffusion layers. The fuel cell plate includes a plurality of ridges and a plurality of grooves facing the fuel cell membrane electrode; the ridge parts and the groove parts are arranged at intervals; the groove part is used for flowing reaction gas, and bosses are respectively arranged at the positions of the two sides of the bottom, which are attached to the side walls of the ridge part; the maximum height dimension of the liquid drop generated during the operation of the fuel cell is H1 which can be kept stable under the hydrophilic degree of the side wall of the ridge part; the height from the boss to the ridge is H2, and H2 satisfies the following conditions: h2 is less than H1. The method can accelerate the discharge of water inside the fuel cell, avoid the fluctuation of reaction gas caused by abrupt change of the section of water drops on the side wall of the ridge, and reduce the influence of water drops on the power generation efficiency of the fuel cell in the water discharge process.

Description

Fuel cell unit cell and polar plate thereof

Technical Field

The present application relates to the field of fuel cells, and in particular to fuel cell single cells and plates thereof.

Background

In a proton exchange membrane fuel cell, fuel gas reaches a catalyst layer through an anode gas diffusion layer, electrode reaction occurs under the action of a catalyst, electrons generated by the electrode reaction flow through an external circuit to reach a cathode through conduction of the catalyst layer, and hydrogen ions reach the cathode under the action of a proton exchange membrane; the oxygen passes through the cathode gas diffusion layer and then reacts with hydrogen ions and electrons under the action of the catalyst to generate water. Part of the water enters the groove-shaped gas channels on the polar plates through the gas diffusion layers and is discharged out of the fuel cell under the action of gas flow.

However, in order to reduce the contact resistance between the electrode plate and the gas diffusion layer, smooth passage of current is ensured, and the ridges on both sides of the gas channel press the gas diffusion layer. On the one hand, the gas diffusion layer becomes dense at the pressing place, and the generated water hardly permeates the gas diffusion layer thereat; on the other hand, the plate ridge pressed with the gas diffusion layer is impermeable to water. Therefore, the water discharge path changes, and thus, the water accumulates at the angle between the ridge portion and the gas diffusion layer. When moisture accumulates excessively, the gas passage becomes narrow, the gas flow rate decreases, and the electrode reaction and the voltage and/or current of the fuel cell are adversely affected.

Some fuel cells in the prior art have a certain drainage structure, but the voltage and/or current of the fuel cell still have adverse variation. For the reasons for this phenomenon, the skilled person generally considers that: or the water draining structure can not drain water completely, so that water still accumulates in the polar plate; or other problems with fuel cells, such as changes in intake pressure, unreasonable flow channel designs, etc.

For this reason, some improvements of drainage structures, intake manifolds, and runner structures have been proposed by the related art, but these approaches are not completely effective.

Disclosure of Invention

One of the important points of the present invention is that the inventors have found another cause of adverse voltage and/or current variation in current fuel cells. The inventors found that water generated by the fuel cell converged to form droplets on the ridge side walls; the liquid drops grow gradually, after the liquid drops grow to a certain extent, the liquid drops are blown away by the gas and broken into a plurality of small liquid drops, at the moment, the abrupt change of the area of the liquid drops in the section can lead to the abrupt change of the passing area and the gas flow of the gas, and further the voltage and/or the current of the battery can change in a short time. Based on the above findings of the inventors, the present invention proposes a fuel cell and a plate thereof, which aim to solve the above problems existing in the prior art.

In order to achieve the above object, the present invention provides a fuel cell electrode plate comprising a plurality of ridges and a plurality of grooves facing the fuel cell membrane electrode;

the plurality of ridges and the plurality of grooves are arranged alternately;

the groove part is used for flowing reaction gas, and bosses are respectively arranged at the positions of the two sides of the bottom, which are attached to the side walls of the ridge part;

the maximum height dimension of the liquid drop generated when the fuel cell works is H1 which can be kept stable under the hydrophilic degree of the side wall of the ridge part;

the height from the boss to the ridge is H2, and H2 meets the following conditions:

H2＜H1。

in some embodiments, the plate surface is a hydrophilic surface.

In some embodiments, the height from the trough bottom to the ridge is H3, H3 satisfying the following condition:

H3＞H1。

in some embodiments, the droplet has a maximum width W1 that is stable at the hydrophilic degree of the ridge side wall when the fuel cell is in operation;

the width W2 of the boss meets the following conditions:

W2＞W1。

in some embodiments, the ridge side walls and boss upper surfaces are hydrophilic surfaces, and the trough bottom and the boss sides are hydrophobic surfaces.

In some embodiments, the boss comprises a multi-stage step;

the step surface having a height from the ridge portion smaller than H1 is a hydrophilic surface;

the step surface having a height from the ridge greater than H1 is a hydrophobic surface.

In some embodiments, the height of the boss increases gradually in a direction away from the ridge.

In some embodiments, the plate further comprises:

a gas inlet end and a gas outlet end;

the groove part is connected with the gas inlet end and the gas outlet end;

the boss is arranged at a section of the groove part close to the gas outlet end.

In some embodiments, the boss is formed simultaneously with the ridge and the groove during processing of the plate; or the boss is formed by laser processing, etching processing or additive processing after the ridge part and the groove part are formed.

In order to achieve the above object, the present invention also provides a fuel cell unit cell comprising:

a membrane electrode assembly;

the two gas diffusion layers are respectively attached to two sides of the membrane electrode assembly;

the fuel cell plate of any one of the preceding embodiments, wherein the ridges of the two plates are respectively bonded to the outer sides of the corresponding gas diffusion layers.

The liquid drops in the fuel cell polar plate are subjected to the combined action of surface tension and gas pressure, and when the gas pressure is smaller than the surface tension, the liquid drops are kept stable; as the droplets grow, the pressure of the gas acting on the droplets increases, and when the droplets grow to a size greater than the maximum height H1 under the hydrophilic degree of the ridge side walls, the gas pressure is greater than the surface tension, and the droplets move and are blown apart into a plurality of small droplets, resulting in abrupt change of the ponding cross section of the flow channel. According to the fuel cell polar plate, the boss is arranged at the bottom of the groove part adjacent to the ridge part, so that the heights of two sides of the ridge part are reduced under the condition that the loss of the area of the gas channel is not large; the height H2 from the boss to the ridge is controlled to be smaller than H1, so that when the liquid drops accumulate and expand, the height of the liquid drops is limited by the boss and is always smaller than H1, and the liquid drops expand towards the extending direction of the ridge, so that the overlarge volume of the liquid drops is avoided, and the liquid drops are blown by the reaction gas. Due to the limitation of the boss and the hydrophilic coating on the side wall, the liquid drops infiltrate along the boss and the side wall, are blown away under the condition that the liquid drops are flat, the influence of the liquid drops on the cross section is reduced, the fluctuation of gas pressure is further reduced, and the stability and the efficiency of the reactor are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

The methods, systems, and/or programs in the accompanying drawings will be described further in terms of exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein reference numerals represent similar mechanisms throughout the several views of the drawings.

FIG. 1 is a combined block diagram of a plate and gas diffusion layer according to some embodiments of the present application;

FIG. 2 is an X-Y plan view of FIG. 1;

FIG. 3 is a schematic view of droplet expansion in section B-B of FIG. 2, with the plate not having a land;

FIG. 4 is a schematic view of droplet expansion in section B-B of FIG. 2, with a land according to other embodiments of the present application;

FIG. 5 is a cross-sectional view of a plate and gas diffusion layer according to further embodiments of the present application;

FIG. 6 is a cross-sectional view of a plate and gas diffusion layer according to further embodiments of the present application;

FIG. 7 is a cross-sectional view of a plate and gas diffusion layer according to further embodiments of the present application;

FIG. 8 is a schematic view of a plate structure according to other embodiments of the present application;

fig. 9 is a block diagram of a fuel cell unit according to some embodiments of the present application.

Icon: 1-polar plate, 2-ridge, 3-trough part, 4-boss, 5-gas diffusion layer, 6-membrane electrode assembly, 7-liquid drop, 8-turbulent flow structure, 9-gas inlet end, 10-gas outlet end, 11-dispersing area and 12-boss setting area.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, if the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship that a product of the application conventionally puts in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description of the present application, if any, are used for distinguishing between the descriptions and not necessarily for indicating or implying a relative importance.

Furthermore, the terms "horizontal," "vertical," and the like in the description of the present application, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The single fuel cell comprises a cathode plate, a cathode gas diffusion layer, a membrane electrode assembly, an anode gas diffusion layer and an anode plate which are sequentially laminated, wherein the membrane electrode assembly comprises a proton exchange membrane and catalyst layers respectively attached to two sides of the proton exchange membrane. The cathode plate and the anode plate comprise an electrode plate body, a plurality of ridges and a plurality of grooves are formed on the electrode plate body, and grooves/ridges are arranged between every two adjacent ridges/grooves, so that a structure with the ridges and the grooves arranged alternately is formed. The cathode plate and the anode plate can have similar structures, and are hereinafter collectively and simply called as polar plates for convenience of description; also, the cathode gas diffusion layer and the anode gas diffusion layer are collectively referred to as a gas diffusion layer.

Fig. 1 is a schematic structural view of a combination of a polar plate 1 and a gas diffusion layer 5 in an embodiment of the present application; fig. 2 is an X-Y plan view of fig. 1. Referring to fig. 1-2, the electrode plate 1 in this embodiment includes a plurality of ridges 2 and a plurality of grooves 3, where the ridges 2 and grooves 3 are spaced apart to form a rectangular wave-like surface, and the ridges 2 are in contact with the gas diffusion layer 5, and the grooves 3 serve as gas channels for flowing a reaction gas, specifically, hydrogen and oxygen. For convenience of description, the direction from the ridge 2 to the bottom of the groove 3 (i.e., the Y-axis direction) is taken as the height direction in the X-Y plane in fig. 2, and the direction between adjacent ridges 2 (i.e., the X-axis direction) is taken as the width direction.

As shown in fig. 2, during normal operation of the fuel cell, droplets 7 will collect at the angle between the ridge 2 and the gas diffusion layer 5. Referring to fig. 3 and 4, for comparison, fig. 3 is a cross-sectional view of fig. 2, which is a view of the cross-section B-B without the boss 4, and the direction of the arrows in the drawing is the direction of the gas flow. As shown in fig. 3 (1) to (3), the droplet 7 expands toward the bottom along the side wall of the ridge 2. Expansion of the droplet 7 results in an increase in the area of the droplet 7 in the cross section; on the one hand, the expansion causes an increase in the windward area of the droplet 7; on the other hand, the expansion causes a decrease in the cross-sectional area of the groove portion 3 through which the reaction gas flows, and an increase in the flow rate of the reaction gas; both factors of increased frontal area and increased gas flow rate lead to an increased force of the flowing gas on the droplets 7, i.e. an increased gas resistance. While the droplet 7 has a certain surface tension on the side walls of the ridge 2, which is determined by the degree of hydrophilicity of the side walls of the ridge 2, i.e. by the hydrophilic angle of the material of the side walls of the ridge 2. As shown in fig. 3 (1) to (3), when the force of the flowing gas on the droplet 7 is smaller than the surface tension, the droplet 7 is kept stable. As shown in fig. 3 (4), after the droplet 7 expands to a certain size, the force of the flowing gas on the droplet 7 is greater than the surface tension, the droplet 7 cannot be kept stable, and the droplet 7 moves rapidly relative to the plate 1 and breaks into a plurality of small-sized droplets 7. The change in cross section of the droplet 7 is more abrupt when the droplet 7 breaks up compared to the slow change in cross section of the droplet during aggregation of the droplet 7; the abrupt decrease in the cross section of the droplet 7 causes an abrupt increase in the cross sectional area of the groove 3 through which the reactant gas can flow, thereby causing abrupt changes in the flow rate and pressure of the reactant gas, which ultimately manifest as fluctuations in the voltage and/or current of the fuel cell.

In this embodiment, the droplet 7 generated when the fuel cell is operated has a maximum height dimension H1 that can be kept stable at the hydrophilic degree of the side wall of the ridge portion 2. After the droplet 7 expands to H1 in the height direction, the force of the flowing gas on the droplet 7 will be greater than the surface tension of the droplet 7, and the droplet 7 cannot be kept stable. H1 can be calculated by a related formula of gas resistance and surface tension; it can also be obtained by constructing simulation models or solid models of the ridge portions 2 and the groove portions 3 of the polar plate 1, and performing simulation or solid experiments in the working parameter range of the fuel cell.

Referring to fig. 2 and 4, fig. 4 is a B-B sectional view of fig. 2 with a boss 4, and the direction of the arrow is the direction of gas flow. In this embodiment, bosses 4 are respectively disposed at positions where two sides of the bottom of the groove 3 are attached to the side walls of the ridge 2, the bosses 4 are rectangular in the X-Y plane of fig. 2, and the height of the bosses 4 from the ridge 2 is H2. As shown in fig. 4 (1) and (2), the droplet 7 also spreads toward the bottom along the side wall of the ridge 2. As shown in (3) and (4) of fig. 4, in this embodiment, H2 is controlled to be smaller than H1, so that when the droplet 7 is accumulated and expanded, the height dimension of the droplet 7 is limited by the boss 4 and is always smaller than H1, the droplet 7 is expanded in the extending direction of the ridge 2 (i.e. in the right direction of fig. 4), the possibility of abrupt change of the cross section of the droplet 7 is reduced, and further, the fluctuation of the battery voltage and/or current is reduced.

The boss 4 in this embodiment may be formed simultaneously with the ridge portion 2 and the groove portion 3 during the stamping or injection molding of the plate 1, or may be formed separately by laser processing, etching processing, or additive processing after the ridge portion 2 and the groove portion 3 of the plate 1 are processed.

In some embodiments, the surface of the polar plate 1 is a hydrophilic surface, and in particular, the hydrophilic surface may be obtained by performing surface treatment on the polar plate 1 or the like. When facing the liquid drops 7 with the same volume, the hydrophilic surface of the polar plate 1 of the embodiment can accelerate the expansion speed of the liquid drops 7 towards the extending direction of the groove part 3, reduce the blocking of the liquid drops 7 to the gas flow passage, increase the contact area of the gas and the liquid drops 7, and facilitate the discharge of the liquid drops 7 in the form of water vapor.

In some embodiments, the height from the bottom of the trough 3 to the ridge 2 is H3 and satisfies H3 > H1. Because the air flow at the bottom of the groove part 3 is slower, if the liquid drops 7 are gathered at the position, the liquid drops are difficult to be discharged quickly, and the embodiment can avoid the liquid drops 7 from entering the bottom of the groove part 3 after being expanded by setting H3 to be more than H1, thereby being beneficial to the drainage of the polar plate 1.

In some embodiments, the droplet 7 also has a maximum width dimension W1 when reaching a stable maximum height dimension H1, i.e. the droplet 7 is able to maintain a stable maximum width at the degree of hydrophilicity of the side walls of the ridge 2 when the fuel cell is in operation; the width W2 of the boss 4 satisfies W2 > W1. In this embodiment, by controlling the width W2 > W1 of the boss 4, the possibility of the droplet 7 entering the bottom of the groove portion 3 can be reduced.

In some embodiments, the ridge 2, the bottom of the groove 3, and the boss 4 are subjected to different surface treatments, so that the side wall of the ridge 2 and the upper surface of the boss 4 are hydrophilic surfaces, the bottom of the groove 3 and the side surface of the boss 4 are hydrophobic surfaces, wherein the upper surface of the boss 4 is the surface of the boss 4 adjacent to the side wall of the ridge 2, and the side surface of the boss 4 is the surface of the boss 4 adjacent to the bottom of the groove 3. The present embodiment prevents the droplet 7 from entering the bottom of the groove portion 3 beyond the boss 4 to some extent by providing a hydrophilic surface and a hydrophobic surface such that the droplet 7 is constrained at the boundary between the two surfaces.

In some embodiments, as shown in fig. 5, the boss 4 is no longer a rectangular single step in cross-section, but rather includes multiple steps. Compared with the boss 4 in the single step form, when the liquid drops 7 with the same volume expand along the multi-step surface, the contact area between the liquid drops 7 and the reaction gas is larger, and meanwhile, the influence of the boss 4 on the gas channel section can be reduced, so that the flow passage of the reaction gas with larger flow rate is facilitated. It will be appreciated that the height H2 from the land 4 to the ridge 2 in this embodiment is the height from the step surface adjacent the side wall of the ridge 2 to the ridge 2.

Further, in some embodiments, in the boss 4 in the form of a multi-step, the step surface having a height from the ridge 2 smaller than H1 is a hydrophilic surface, and the step surface having a height from the ridge 2 larger than H1 is a hydrophobic surface, wherein the height of the step side surface from the ridge 2 is the height of the step side surface lowest from the ridge 2. The present embodiment prevents the droplet 7 from entering the bottom of the groove portion 3 beyond the boss 4 to some extent by providing a hydrophilic surface and a hydrophobic surface such that the droplet 7 is constrained at the boundary between the two surfaces. In order to facilitate the processing and surface treatment of the boss 4, the number of the steps of the multiple steps is preferably not excessive, and two steps are preferable.

As shown in fig. 6, in some embodiments, the height of the boss 4 gradually increases in a direction away from the ridge 2, i.e., in a direction toward the center of the groove 3, and at this time, the height H2 of the boss 4 to the ridge 2 is the height from the junction of the boss 4 and the side wall of the ridge 2 to the ridge 2. By changing the height of the boss 4 so that the upper surface of the boss 4 is inclined toward the liquid droplet 7, expansion of the liquid droplet 7 toward the groove portion 3 can be suppressed, and entry of the liquid droplet 7 into the bottom of the groove portion 3 can be avoided.

Further, as shown in fig. 7, in some embodiments the groove 3 is provided with a spoiler structure 8 between the two bosses 4 of the bottom. Specifically, the turbulence structure 8 may be a structure protruding from the bottom of the groove 3 and integrated with the electrode plate 1, or may be a structure provided at the bottom of the groove 3 by additive processing, adhesion, or the like. The turbulence structure 8 interferes the reactant gas flowing in the groove, so that part of the reactant gas is promoted to flow towards the direction of the gas diffusion layer 5 to participate in electrode reaction, and the utilization rate of the reactant gas and the working efficiency of the fuel cell are improved. It can be appreciated that in this embodiment, the turbulence structure 8 is disposed at the bottom of the groove portion 3, and in combination with the measures for preventing the liquid droplet 7 from entering the bottom of the groove portion 3 in the foregoing embodiment, the liquid droplet 7 can be prevented from flooding the turbulence structure 8 to the maximum limit, so as to prevent the liquid droplet 7 from affecting the interference of the turbulence structure 8 on the reaction gas.

Referring to fig. 8, fig. 8 is a view of the plate 1 in the X-Z plane in some embodiments, and the plate 1 further includes a gas inlet end 9 and a gas outlet end 10. The groove portion 3 is connected to the gas inlet end 9 and the gas outlet end 10 via diffusion regions 11, respectively, and the boss 4 (not shown in fig. 8) is provided at a section of the groove portion 3 near the gas outlet end 10, i.e., a hatched region in fig. 8, which is a boss-provided region 12. Specifically, the boss 4 occupies 1/3 to 1/2 of the entire length of the groove portion 3 and is close to the gas outlet end 10. In this embodiment, the water generated by the fuel cell is mainly concentrated in the rear section of the groove portion 3, that is, the section of the groove portion 3 near the gas outlet end 10, and the groove portion 3 near the gas inlet end 9 is relatively water-deficient, so that the processing cost can be reduced on the basis of ensuring the water draining effect by disposing the boss 4 in the section of the groove portion 3 near the gas outlet end 10.

As shown in fig. 9, the related embodiment relates to a fuel cell unit cell including a membrane electrode assembly 6, two gas diffusion layers 5, and two fuel cell plates 1 as in any of the foregoing embodiments. Wherein, two gas diffusion layers 5 are respectively attached to two sides of the membrane electrode assembly 6, two polar plates 1 are respectively used as a cathode plate and an anode plate, and the ridge 2 on the polar plate 1 is respectively attached to the outer sides of the corresponding gas diffusion layers 5.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. A fuel cell plate comprising a plurality of ridges and a plurality of grooves facing the fuel cell membrane electrode;

the plurality of ridges and the plurality of grooves are arranged alternately;

the groove part is used for flowing reaction gas, and bosses are respectively arranged at the positions of the two sides of the bottom, which are attached to the side walls of the ridge part;

the maximum height dimension of the liquid drop generated when the fuel cell works is H1 which can be kept stable under the hydrophilic degree of the side wall of the ridge part;

the height from the boss to the ridge is H2, and H2 meets the following conditions:

H2＜H1。

2. the fuel cell plate of claim 1 wherein the plate surface is a hydrophilic surface.

3. The fuel cell plate of claim 1, wherein the height from the bottom of the groove to the ridge is H3, H3 satisfying the following condition:

H3＞H1。

4. the fuel cell plate of claim 1 wherein the droplets have a maximum width W1 that remains stable under the hydrophilic degree of the ridge side walls when the fuel cell is in operation;

the width W2 of the boss meets the following conditions:

W2＞W1。

5. the fuel cell plate of claim 1 wherein the ridge side walls and land upper surfaces are hydrophilic surfaces and the groove bottoms and the land sides are hydrophobic surfaces.

6. The fuel cell plate of claim 1, wherein the boss comprises a multi-stage step;

the step surface having a height from the ridge portion smaller than H1 is a hydrophilic surface;

the step surface having a height from the ridge greater than H1 is a hydrophobic surface.

7. The fuel cell plate of claim 1, wherein the height of the boss increases progressively in a direction away from the ridge.

8. The fuel cell plate of any one of claims 3-7, wherein the plate further comprises:

a gas inlet end and a gas outlet end;

the groove part is connected with the gas inlet end and the gas outlet end;

the boss occupies 1/3-1/2 of the whole length of the groove part and is arranged at a section of the groove part close to the gas outlet end.

9. The fuel cell plate of claim 1 wherein the boss is formed simultaneously with the ridge and the groove during processing of the plate or the boss is formed separately after the ridge and the groove are formed by laser processing, etching processing, or additive processing.

10. A single fuel cell, comprising:

a membrane electrode assembly;

the two gas diffusion layers are respectively attached to two sides of the membrane electrode assembly;

two fuel cell plates according to any one of claims 1 to 9, the ridges of the two plates respectively adhering to the outer sides of the respective gas diffusion layers.

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