CN116666680A - Fuel cell and electrode plate thereof - Google Patents

Abstract

The application relates to a fuel cell and a polar plate thereof, wherein the polar plate comprises: a plate body; the drainage ridge is arranged on the first side of the plate body and is formed by arranging a plurality of drainage units extending along the first direction; the drainage unit includes: a support part arranged on the first side of the plate body; the capillary part is arranged on one side of the supporting part, which is away from the plate body; wherein, the capillary part is provided with a plurality of capillary grooves; the support part is provided with a first channel extending along the first direction and a second channel extending along a second direction intersecting the first direction; the capillary groove, the first channel and the second channel are communicated in pairs. The drainage ridge structure can automatically absorb generated water by arranging the capillary part, and drain water in multiple directions by the first channel part and the second channel part which are mutually communicated, so that the drainage efficiency is improved, the flooding phenomenon of the membrane electrode is improved, and the gas utilization rate and the stability of the fuel cell are improved.

Description

Fuel cell and electrode plate thereof

Technical Field

The application relates to the technical field of batteries, in particular to a fuel cell and a polar plate thereof.

Background

In recent years, hydrogen-oxygen fuel cells in fuel cell technology have become one of the main forms of hydrogen energy utilization. Proton exchange membrane fuel cells (proton exchange membrane fuel cell, PEMFCs) are a power generation device that directly converts chemical energy stored in hydrogen and an oxidant into electrical energy through an electrochemical reaction. The proton exchange membrane fuel cell has no pollution, high theoretical energy conversion rate, and important value for solving two problems of energy crisis and environmental pollution, and has wide application in aviation, automobile and other fields. The structural design of the bipolar plate is one of important factors influencing the performance of the battery, and the reasonable structural design can reduce the cost of the electric pile and improve the performance of the electric pile. However, due to the restriction of the design of the conventional bipolar plate structure, the proton exchange membrane fuel cell is particularly easy to generate more water on the cathode side during operation, and further forms a water film by stacking the cathode plates, so that the transmission of reaction gas is seriously hindered, the performance of the cell is reduced, and even the partial flooding phenomenon of the membrane electrode can be caused.

Disclosure of Invention

In view of the above, it is necessary to provide a fuel cell and a plate thereof having high drainage efficiency.

In one aspect, there is provided a plate for a fuel cell, comprising:

a plate body; a kind of electronic device with high-pressure air-conditioning system

The drainage ridge is arranged on the first side of the plate body and is formed by arranging a plurality of drainage units extending along the first direction; the drainage unit includes:

a support part arranged on the first side of the plate body; and

mao Xibu, which is arranged on one side of the supporting part far away from the plate body;

wherein, the capillary part is provided with a plurality of capillary grooves;

the support part is provided with a first channel extending along the first direction and a second channel extending along a second direction intersecting the first direction;

the capillary groove, the first channel and the second channel are communicated in pairs. In one embodiment, the capillary portion includes a plurality of support posts disposed on the support portion, adjacent support posts being spaced apart to form the capillary groove.

In one embodiment, the width of the capillary groove is less than or equal to the width of the support post. In one embodiment, the width of the capillary groove is d, and d is more than or equal to 0.005mm and less than or equal to 0.2mm.

In one embodiment, the support portion further includes a first support portion and a second support portion, the capillary portion is disposed on a side of the first support portion away from the plate body, and the second support portion is disposed between the first support portion and the plate body.

In one embodiment, the capillary part comprises a plurality of capillary units arranged at intervals, and the first supporting part comprises a plurality of supporting units corresponding to the capillary units; the capillary units adjacent to each other and the support units adjacent to each other in the second direction form the first channel, and the capillary units adjacent to each other and the support units adjacent to each other in the first direction form the second channel.

In one embodiment, a drainage groove is formed in one side of the first supporting portion facing the first channel, and/or a drainage groove is formed in one side of the first supporting portion facing the second channel; the drainage groove communicates the capillary groove with the first channel or the second channel.

In one embodiment, a plurality of drainage ridges are arranged, the drainage ridges are arranged at intervals, and a main channel extending along a first direction is arranged between adjacent drainage ridges; the main channel is communicated with the first channel;

the first channels penetrate through the capillary part along a first direction, and the first channels of adjacent drainage units are communicated with each other.

In one embodiment, the drainage unit has a non-planar shape along opposite sides in a direction perpendicular to the first direction.

In one aspect, a fuel cell is provided that includes the electrode plate.

The drainage ridge structure can automatically absorb generated water by arranging the capillary parts, and drain water in multiple directions through the first channel and the second channel which are mutually communicated, so that the drainage efficiency is improved, the flooding phenomenon of the membrane electrode is improved, and the gas utilization rate and the stability of the fuel cell are improved.

Drawings

Fig. 1 is a schematic structural diagram of a polar plate according to an embodiment of the application.

Fig. 2 is a schematic structural diagram of a drainage unit according to an embodiment of the application.

Fig. 3 is a top view of a drainage unit according to an embodiment of the present application.

Fig. 4 is a partial enlarged view at a in fig. 2.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic view of a plate for a fuel cell according to an embodiment of the present application, and a plate 1 according to an embodiment of the present application includes a plate body 200 and a drainage ridge 101. The plate body 200 and the drainage ridge 101 may be integrally formed, and in this embodiment, the drainage ridge 101 is separately formed and then connected to the plate body 200, and the electrode plate 1 may be particularly used on the cathode side of a proton exchange membrane fuel cell. The drain ridge 101 may be formed of graphite, titanium, stainless steel, and other composite materials.

The drainage ridge 101 is disposed on a first side of the plate 200, the first side being the side of the plate 200 facing the membrane electrode. The drainage ridge 101 is composed of a plurality of drainage cells 100 arranged to extend in the first direction a. The drainage ridges 101 are provided in plurality, the plurality of drainage ridges 101 are arranged at intervals along the second direction B, and the main channel 300 extending along the first direction a is provided between adjacent drainage ridges 101. The water generated in the fuel cell is discharged out of the polar plate 1 through the main channel 300, the bottom of the main channel 300 is a plate body 200, the side part is an adjacent drainage ridge 101, and the main channel 300 is surrounded by the plate body 200 and the drainage ridges 101 at the two sides. The drain ridge 101 has a drain function and can also support other structures inside the fuel cell, such as membrane electrodes, catalysts, and the like.

As shown in fig. 2 and 3, the drainage unit 100 includes a capillary portion 110 and a supporting portion. The support portion is disposed on a first side of the plate body, and Mao Xibu 110 is disposed on a side of the support portion away from the plate body 200. The support portion is provided with a first channel 120 extending in the first direction a and a second channel 130 extending in a second direction B intersecting the first direction a.

Capillary grooves 112 for absorbing water are provided on the capillary portion 110. The first channel 120 penetrates the capillary 110 along a first direction a. The first channel 120 passes through the capillary 110 along a second direction B intersecting the first direction a. The first channel 120 communicates with the second channel 130, and further, the first channel 120 communicates with the second channel 130 in an intersecting manner. The capillary groove 112, the first channel 120 and the second channel 130 are disposed in communication with each other. The capillary groove 112, the first channel 120 and the second channel 130 are communicated with each other in pairs, so that the generated water can be rapidly discharged out of the plate 1 through a plurality of structures communicated with each other, and the water is discharged out of the plate 1 by using the purge direction of the reaction gas.

In the present embodiment, the capillary groove 112 is disposed to extend toward a third direction C, which is perpendicular to the first direction a. The capillary groove 112 is a plurality of grooves or gaps with smaller diameters to form a capillary adsorption effect on the water generated by the membrane electrode. The capillary groove 112 communicates with one or more of the first channel 120, the second channel 130, and the main channel 300. Further, the capillary portion 110 directly contacts the external structure, and in the proton exchange membrane fuel cell of the present embodiment, the Mao Xibu is in contact with a membrane electrode (not shown in the drawing), the membrane electrode is disposed in a direction parallel to the first direction a, and the capillary groove 112 is perpendicular to the membrane electrode, i.e., the third direction C is perpendicular to the first direction a. By arranging the capillary part 110 with the capillary groove 112, the polar plate 1 can directly absorb and transmit water generated at the side of the polar plate 1 into the channel, so that the phenomenon of local flooding of the membrane electrode is effectively avoided, and meanwhile, the capillary part 110 can also provide a supporting function for the membrane electrode.

Mao Xibu 110 and Mao Xibu 110 have a total height of less than or equal to 1mm and greater than or equal to 0.01mm, preferably less than or equal to 0.5mm and greater than or equal to 0.05mm.

As shown in fig. 4, further, the capillary portion 110 includes a plurality of support columns 111, and adjacent support columns 111 are spaced apart to form a capillary groove 112. The width d of the capillary groove 112 is less than or equal to the width of the support column 111. It is understood that the width d of the capillary groove 112 refers to the dimension of the capillary groove 112 in the first direction a or the second direction B; the width of the support column 111 refers to the dimension of the support column 111 in the first direction a or the second direction B, and when the width d of the capillary groove 112 is compared with the width of the support column 111, it refers to the dimension of both in the same direction. The width d of the capillary groove 112 is less than or equal to 0.2mm and greater than or equal to 0.005mm. Preferably, the width d of the capillary groove 112 is less than or equal to 0.1mm and greater than or equal to 0.01mm. The support column 111 has a width of less than or equal to 0.2mm and greater than or equal to 0.005mm. Preferably, the support column 111 has a width of less than or equal to 0.1mm and greater than or equal to 0.01mm. The height of the support column 111 is less than or equal to 0.2mm and greater than or equal to 0.005mm. Preferably, the height of the support column 111 is less than or equal to 0.1mm and greater than or equal to 0.01mm. Accordingly, the depth of the capillary groove 112 is less than or equal to 0.2mm and greater than or equal to 0.005mm. Preferably, the capillary groove 112 has a depth of less than or equal to 0.1mm and greater than or equal to 0.01mm. It is understood that the depth of the capillary groove 112 refers to the dimension of the capillary groove 112 in the third direction C, and the height of the support column 111 refers to the dimension of the support column 111 in the third direction C, and the respective heights of the support columns 111 correspond to the respective depths of the capillary groove 112. The size of the capillary groove 112 can increase the water absorption area and the water absorption and drainage capacity of the capillary part 110 while conforming to the processing technology of the structure of the polar plate 1.

In the present embodiment, the plurality of capillary grooves 112 formed by the plurality of support columns 111 communicate with each other in the first direction a, the second direction B, and further communicate to the first passage 120 and the second passage 130. Since the capillary portion 110 directly contacts the membrane electrode, and the capillary portion 110 is located at the uppermost side of the entire drainage unit 100, the capillary portion 110 needs to have a certain supporting function, and the support column 111 is preferably a rectangular parallelepiped structure with a supporting surface formed at an end portion.

In other embodiments, the support column 111 may have a three-dimensional structure such as a cylinder or a truncated cone; the support column 111 may be replaced with other structures such as a planar support wall that allows the capillary groove 112 to communicate only in a desired direction.

The drainage unit 100 further includes a first support 140 and a second support 150. Mao Xibu 110 is provided on the first supporting portion 140 at a side away from the plate 200, and the second supporting portion 150 is provided between the first supporting portion 140 and the plate 200. That is, in the third direction C, the drainage unit 100 includes the first support 140, the second support 150, and the capillary portion 110 in this order.

The support column 111 and the capillary groove 112 are provided on the first support part 140. The first support portion 140 has a first end surface 143 facing the third direction C, and the support column 111 is disposed on the first end surface 143 and extends toward the third direction C. In this embodiment, the first support 140 is a solid structure and provides further support to the capillary 110.

The capillary portion 110 includes a plurality of capillary units disposed at intervals. The capillary units adjacent in the second direction B form a first channel 120 and the capillary units adjacent in the first direction a form a second channel 130. The first support 140 includes a plurality of support units corresponding to the respective capillary units. The capillary units adjacent to each other in the second direction B and the support units adjacent to each other in the first direction a form a first channel 120 together, and the capillary units adjacent to each other and the support units adjacent to each other in the first direction a form the second channel 130 together.

It will be appreciated that since the first and second channels 120 and 130 are respectively intersecting and penetrating the Mao Xibu, the capillary portion 110 includes a plurality of capillary units separated by the first and second channels 120 and 130, and the capillary units in the same drainage unit 100 are disposed at intervals. The first and second channels 120 and 130 penetrate the first support 140, respectively, to divide the first support 140 into a plurality of support units corresponding to the capillary units. In this embodiment, one first channel 120 and one second channel 130 are respectively disposed, the first channel 120 vertically penetrates through the center of the second channel 130, the center of the capillary portion is the vertical intersection point, the whole of the first channel 120 and the second channel 130 is in a central symmetrical structure, and the Mao Xibu channels are divided into symmetrical 4 capillary units.

In other embodiments, the first channel 120 and the second channel 130 may not intersect or communicate with the center of the capillary; the intersection of the first channel 120 and the second channel 130 may not be centered in the capillary.

The first support 140 is provided with a drainage groove 160 on a side facing the first channel 120, and/or the first support 140 is provided with a drainage groove 160 on a side facing the second channel 130. Specifically, the first support portion 140 has a first side 141 separated by the first channel 120 and a second side 142 separated by the second channel 130, and the first side 141 and/or the second side 142 is provided with a drainage groove 160. In the present embodiment, since the first channel 120 and the second channel 130 intersect and penetrate the Mao Xibu channel 110 to divide the capillary portion into 4 capillary units, it is understood that two first side surfaces 141 are oppositely disposed, and two first side surfaces 141 are disposed in a group, and two groups are disposed in total; the second side surfaces 142 are disposed opposite to each other, and two second side surfaces 142 are disposed in one group, and two groups are disposed in total. The first side 141 is parallel to the first direction a and the second side 142 is parallel to the second direction B. The drainage groove 160 communicates with the capillary groove 112, the drainage groove 160 is provided corresponding to the position of the capillary groove 112, and the drainage groove 160 extends from the bottom of the capillary groove 112 located at the edge of the capillary unit in a direction opposite to the third direction C. The depth of the drainage groove 160 is smaller than the width of the capillary groove 112, and the depth of the drainage groove 160 refers to the depth of the drainage groove 160 recessed from the first side 141 or the second side 142. By arranging the plurality of drainage grooves 160 on one side of the first channel 120 and one side of the second channel 130 and enabling the drainage grooves 160 to be communicated with the capillary groove 112, the communication between the capillary groove 112 and the first channel 120 and the second channel 130 is more efficient, water in the capillary groove 112 can be drained to the first channel 120 and the second channel 130 along each drainage groove 160 by utilizing the adsorbability of water, water generated at the membrane electrode can be drained timely, and the occurrence of the phenomenon of partial flooding of the membrane electrode is effectively improved.

It is understood that the drainage channel 160 may also extend from the bottom of the capillary groove 112 toward other directions and finally communicate with the first channel 120 or the second channel 130.

The first channel 120 and the second channel 130 may also be regarded as a space formed between adjacent capillary units. In the present embodiment, the first channel 120 and the second channel 130 have a groove structure, the first channel 120 and the second channel 130 are formed between the first supporting portions 140, and the bottoms of the first channel 120 and the second channel 130 are second end surfaces 151 of the second supporting portions 150 facing the third direction C. Further, the first supporting portion 140 extends from the second end surface 151 of the second supporting portion 150 toward the third direction C.

The width of the first channel 120 is less than or equal to 2mm and greater than or equal to 0.01mm, preferably the width of the first channel 120 is less than or equal to 1mm and greater than or equal to 0.1mm. The width of the second channel 130 is less than or equal to 2mm and greater than or equal to 0.01mm, preferably the width of the second channel 130 is less than or equal to 1mm and greater than or equal to 0.1mm. It is understood that the width of the first channel 120 refers to the width of the first channel 120 in the second direction B. It is understood that the width of the second channel 130 refers to the width of the second channel 130 in the first direction a. In the above-mentioned width ranges of the first channel 120 and the second channel 130, the ratio of the total cross-sectional area of the first channel 120 and the second channel 130 to the cross-sectional area of the drainage unit 100 is less than 50%, and since the capillary portion 110 plays a supporting role, and the capillary portion 110 plays a supporting role is a plurality of support columns 111, in order to ensure that the support columns 111 can form a capillary structure, the size of the support columns 111 is smaller, so that the ratio of the total cross-sectional area of the first channel 120 and the second channel 130 cannot exceed 50%, so as to ensure that the electrode plate 1 has a better supporting effect on the membrane electrode, and meanwhile, mao Xibu also has a sufficient number of capillary grooves 112, so as to ensure that the membrane electrode has a better water absorbing and draining effect.

In the present embodiment, the drainage units 100 are arranged in the first direction a, and the first passages 120 penetrate the drainage units 100, so that the first passages 120 of adjacent drainage units 100 communicate with each other. The first passage 120 communicates with the main passage 300 through a second passage 130 disposed in the second direction B. The support columns 111 of the adjacent drainage cells 100 are disposed against each other to increase the support strength at the joints of the adjacent drainage cells 100. The drainage unit 100 can be tightly connected to the plate body 200 after being independently processed, so that the processing difficulty is reduced, the single drainage unit 100 can be detached and replaced according to the use condition, and the service life of the whole drainage ridge is prolonged.

In other embodiments, the drainage cells 100 may be arranged in other directions; the first channel 120 or the second channel 130 may be non-linear, and when the first channel 120 or the second channel 130 of the drainage unit 100 is non-linear, the drainage units 100 are arranged in a specific direction such that the first channels 120 or the second channels 130 of adjacent drainage units 100 communicate with each other; the corresponding support columns 111 of adjacent drainage cells 100 are spaced apart.

When the drainage units 100 are arranged in the first direction a, the drainage units 100 include opposite side surfaces in a direction perpendicular to the first direction a. Further, the drainage unit 100 includes opposite side surfaces disposed along the second direction B, and the side surfaces are non-planar. In this embodiment, both side surfaces are arc-shaped, and the shapes of both side surfaces are centrosymmetric. The main channel 300 is formed between the sides of the adjacent drainage ridges 101, and the curved sides facilitate the circulation of water and gas in the main channel 300, thereby improving the accumulation problem of generated water nearby and improving the transmission efficiency of the reaction gas. Since both sides are arc-shaped, the width of the drainage unit 100 near the opposite sides in the first direction a is smaller than the width of the middle of the drainage unit 100, and in order to increase the supporting strength of the capillary portion 110, the cross-sectional area of the support column 111 near the opposite sides of the drainage unit 100 in the first direction a is larger than the cross-sectional area of the support column 111 in the middle of the drainage unit 100.

The length of the drainage unit 100 in the first direction a is less than or equal to 10mm and greater than or equal to 0.01mm, and preferably, the length of the drainage unit 100 in the first direction a is less than or equal to 6mm and greater than or equal to 0.5mm. Accordingly, the length of the first channel 120 is less than or equal to 10mm and greater than or equal to 0.01mm, and preferably, the length of the first channel 120 is less than or equal to 6mm and greater than or equal to 0.5mm.

The maximum width of the drainage cell 100 in the second direction B is less than or equal to 5mm and greater than or equal to 0.01mm, and preferably, the maximum width of the drainage cell 100 in the second direction B is less than or equal to 2mm and greater than or equal to 0.3mm. Accordingly, the length of the second channel 130 is less than or equal to 5mm and greater than or equal to 0.01mm, and preferably, the length of the second channel 130 is less than or equal to 2mm and greater than or equal to 0.3mm.

The height of the drainage unit 100 in the third direction C is less than or equal to 2mm and greater than or equal to 0.01mm, and preferably, the height of the drainage unit 100 in the third direction C is less than or equal to 1mm and greater than or equal to 0.1mm.

The electrode plate 1 in this embodiment is applied to a fuel cell, especially a proton exchange membrane fuel cell, where the electrode plate 1 is disposed on two sides of a membrane electrode, and it should be understood that an air inlet, an air outlet, a water outlet, etc. which are not shown in the drawings and are communicated with the outside are further disposed on the electrode plate 1.

The working principle of the application is briefly described below: when the fuel cell works, reaction gas enters the polar plates 1 from the gas inlet to generate electrochemical reaction, and when water generated by the electrochemical reaction is gathered at the drainage ridge of the bipolar plate, capillary phenomenon is formed by the micro-size structure between the support columns 111, so that water generated at the bipolar plate side automatically flows into the capillary groove 112 along the support columns 111; the water droplets collected in the capillary groove 112 flow to the first and second channels 120 and 130 along the drainage groove 160 under the purge of the reaction gas; the water collected in the first channel 120 arranged along the first direction a is smoothly discharged out of the polar plate 1 under the action of the purge gas along the first direction a; the water collected in the second channel 130 disposed in the second direction B is collected to the main channel 300 by the purge gas in the second direction B, and is discharged out of the plate 1 through the main channel 300. The drainage ridge structure of the bipolar plate can automatically absorb generated water and drain water in multiple directions, so that the drainage efficiency is improved, the flooding phenomenon of the membrane electrode is improved, and the gas utilization rate and the stability of the fuel cell are improved.

It will be appreciated that the drainage ridges or drainage cells in this embodiment may be formed on opposite sides of the plate body in a third direction to form a bipolar plate structure.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A plate for a fuel cell, comprising:

a plate body; a kind of electronic device with high-pressure air-conditioning system

The drainage ridge is arranged on the first side of the plate body and is formed by arranging a plurality of drainage units extending along the first direction; the drainage unit includes:

a support part arranged on the first side of the plate body; and

mao Xibu, which is arranged on one side of the supporting part far away from the plate body;

wherein, the capillary part is provided with a plurality of capillary grooves;

the support part is provided with a first channel extending along the first direction and a second channel extending along a second direction intersecting the first direction;

the capillary groove, the first channel and the second channel are communicated in pairs.

2. The plate for a fuel cell according to claim 1, wherein the capillary portion includes a plurality of support posts provided on the support portion, adjacent support posts being spaced apart to form the capillary groove.

3. The plate for a fuel cell of claim 2, wherein the capillary groove has a width less than or equal to a width of the support post.

4. The plate for a fuel cell of claim 2, wherein the capillary groove has a width d of 0.005mm +.d +.0.2 mm.

5. The plate for a fuel cell according to claim 1, wherein the support portion includes a first support portion and a second support portion that are stacked, the capillary portion being provided on a side of the first support portion remote from the plate body, the second support portion being provided between the first support portion and the first side of the plate body.

6. The plate for a fuel cell according to claim 5, wherein the capillary portion includes a plurality of capillary cells arranged at intervals, and the first support portion includes a plurality of support cells corresponding to each of the capillary cells; the capillary units adjacent to each other and the support units adjacent to each other in the second direction form the first channel, and the capillary units adjacent to each other and the support units adjacent to each other in the first direction form the second channel.

7. The electrode plate for a fuel cell according to claim 6, wherein a side of the first support portion facing the first channel is provided with a drainage groove, and/or a side of the first support portion facing the second channel is provided with a drainage groove; the drainage groove communicates the capillary groove with the first channel or the second channel.

8. The plate for a fuel cell according to claim 1, wherein a plurality of the drain ridges are provided, the plurality of the drain ridges being spaced apart, a main channel extending in a first direction being provided between adjacent ones of the drain ridges; the main channel is communicated with the first channel;

the first channels penetrate through the capillary part along a first direction, and the first channels of adjacent drainage units are communicated with each other.

9. The electrode plate for a fuel cell according to claim 1, wherein opposite sides of the drainage unit in a direction perpendicular to the first direction are non-planar shapes.

10. A fuel cell comprising a plate as claimed in any one of claims 1 to 9.