Electrolytic bath

Abstract

The utility model discloses an electrolytic cell. The electrolytic cell comprises a bipolar plate, a diffusion layer and at least two runner plates, the plurality of runner plates are stacked between the bipolar plate and the diffusion layer; the runner plate comprises a plurality of opening parts, a plurality of supporting parts and a plurality of connecting parts; the opening parts and the supporting parts are arranged at intervals in the first direction, and the adjacent opening parts and supporting parts are connected through the connecting parts; the opening part and the adjacent connecting part are encircled to form a first type channel of which the section opening faces the bipolar plate; a second type channel with a section opening facing the diffusion layer is defined by the supporting part and the adjacent connecting part; a plurality of mass transfer holes are formed in each hole opening part. The smoothness and uniformity of a fluid medium transmission process can be improved, and the electrolysis efficiency is higher; and the contact resistance is reduced, heat generated in the using process can be reduced, and the problems that the electrolysis efficiency is reduced and even parts are damaged due to the fact that the temperature is too high are solved.

Description

Technical Field

[0001] This application relates to the field of equipment for producing hydrogen and oxygen by electrolyzing water, and particularly to an electrolytic cell. Background Art

[0002] The flow field plate is an important component of electrolytic cell equipment (such as a PEM electrolytic cell), and functions in mass transfer, support, electrical conduction, heat transfer, etc.

[0003] For a flow field plate with improper design, during operation, problems such as excessive resistance, large mass transfer resistance, and uneven mass transfer may occur, which will lead to a decrease in the hydrogen production efficiency of the electrolytic cell, and even local overheating may occur, resulting in the burning out of the electrolytic cell equipment. Summary of the Utility Model

[0004] In view of this, the purpose of this application is to provide an electrolytic cell with uniform mass transfer, small mass transfer resistance, which can avoid excessive local resistance, improve the hydrogen production efficiency of the battery cell, and can also avoid the problem of equipment burnout caused by local overheating.

[0005] To achieve at least one of the above purposes, this application provides the following technical solutions:

[0006] In a first aspect, an embodiment of this application provides an electrolytic cell, including a bipolar plate, a diffusion layer, and at least two flow field plates;

[0007] Multiple said flow field plates are stacked between the bipolar plate and the diffusion layer;

[0008] The flow field plate includes a plurality of opening parts, a plurality of supporting parts, and a plurality of connecting parts;

[0009] The opening parts and the supporting parts are arranged at intervals along a first direction, and adjacent opening parts and supporting parts are connected by the connecting parts;

[0010] The opening part and the adjacent connecting part enclose a first-type channel with a cross-section opening towards the bipolar plate;

[0011] The supporting part and the adjacent connecting part enclose a second-type channel with a cross-section opening towards the diffusion layer;

[0012] Each said opening part is provided with a plurality of mass transfer holes.

[0013] In some embodiments, the plurality of opening parts, the supporting parts, and the connecting parts are integrally formed.

[0014] In some embodiments, the openings of the first-type channel and the second-type channel are flared structures.

[0015] In some embodiments, the cross-sections of both the first-type channel and the second-type channel are trapezoidal.

[0016] In some embodiments, the angle at which the connecting portion is bent relative to the opening portion is an acute angle;

[0017] The angle at which the connecting portion is bent relative to the supporting portion is also an acute angle.

[0018] In some embodiments, the widths of the first-type channels on each adjacent pair of the flow channel plates are different;

[0019] The widths of the second-type channels on adjacent pairs of the flow channel plates are also different;

[0020] The width is the dimension of the first-type channel and the second-type channel in the first direction.

[0021] In some embodiments, there are two flow channel plates. The one closer to the bipolar plate is the first flow channel plate, and the one closer to the diffusion layer is the second flow channel plate;

[0022] The widths of the first-type channels and the second-type channels on each flow channel plate are the same;

[0023] The width of the first-type channel on the first flow channel plate is D1, and the width of the first-type channel on the second flow channel plate is D2, where D1 > D2.

[0024] In some embodiments, the area where the opening portion of one of the flow channel plates abuts against the supporting portion of the adjacent flow channel plate is S1, and the area of the corresponding opening portion facing the adjacent flow channel plate is S2; where S1 / S2 ≥ 0.2.

[0025] In some embodiments, the sizes of the mass transfer holes on adjacent pairs of the flow channel plates, and the intervals between the mass transfer holes on adjacent pairs of the flow channel plates are different.

[0026] In some embodiments, opposite ends of the mass transfer holes extend from the opening portion to the connecting portion connected to the opening portion.

[0027] In the above technical solution, the flow channel plates are provided to form the first-type channels and the second-type channels, which can improve the smoothness of the fluid medium transmission process. The fluid medium, such as electrolyte, is less likely to have turbulent flow due to impact during transportation, is more evenly distributed in each area, and has a higher electrolysis efficiency.

[0028] In addition, the contact between the flow channel plate and the adjacent components is surface contact, which is beneficial to reducing the contact resistance, can reduce the heat generated during use, avoid excessive temperature, and prevent problems such as a decrease in electrolysis efficiency and even damage to the components.

[0029] During the processing and forming of the flow channel plate, reducing the bending angle of the plate, minimizing damage to the plate structure, ensuring the stability of the structure, avoiding damage caused by excessive bending angles, and making the processing and forming more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of an electrolytic cell provided by some embodiments of the present application;

[0032] Figure 2 Schematic diagram of the structure of the flow channel plate provided by some embodiments of the present application

[0033] Figure 3 Schematic diagram of the relative position relationship of the flow channel plate provided by some embodiments of the present application;

[0034] Figure 4 Schematic diagram of the structure of the flow channel plate provided by other embodiments of the present application;

[0035] Figure 5 For the present application Figure 4 Enlarged schematic diagram of part A.

[0036] The reference numerals are as follows:

[0037] 1. Bipolar plate;

[0038] 2. Flow channel plate, 21. Opening part, 22. Supporting part, 23. Connecting part; 24. Mass transfer hole;

[0039] 2a. First flow channel plate, 2b. Second flow channel plate;

[0040] 3. Diffusion layer;

[0041] 4. First type of channel;

[0042] 5. Second type of channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present application will be further described in detail below with reference to the drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more clearly defined.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above-mentioned drawings of this application are intended to cover non-exclusive inclusion.

[0045] As used in this application, the term "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0046] The special term "exemplary" used in this application means "serving as an example, embodiment, or illustration". Among them, any embodiment described as "exemplary" does not have to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0047] In the description of this application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features.

[0048] In the description of this application, the technical term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0049] In the description of this application, the technical terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this application. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0050] In the description of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "attachment", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] In the description of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0052] In the description of the present application, the meaning of "a plurality of" is two or more (including two), unless otherwise clearly and specifically limited.

[0053] In the description of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to the present application.

[0054] As part of the creative concept of the present application, before describing the embodiments of the present application, it is necessary to analyze the problems of excessive resistance, large mass transfer resistance, uneven mass transfer, etc. in the related art, which lead to the reduction of the hydrogen production efficiency of the electrolytic cell, and the reasons for the problem of local overheating and the burning of the electrolytic cell equipment. Through reasonable analysis, the technical solutions of the embodiments of the present application are obtained.

[0055] In the related art, an electrolytic cell includes structures such as bipolar plates, diffusion layers, and flow channel plates. Among them, the flow channel plate is disposed between the bipolar plate and the diffusion layer to form a flow channel structure for guiding the flow of electrolyte. Designing different flow channel structures formed by the flow channel plate will affect the distribution of the electrolyte, the discharge of gas, and the transfer of heat. In the existing structure, the flow channel structure is integrated on the bipolar plate, and the conventional form is an uneven structure. Different components are in contact to achieve the conduction of current. However, during use, the fluid medium is transmitted in the flow channels formed by the uneven structure. Due to the existence of a large number of uneven structures, the fluid impact is prone to disturbance, which easily leads to problems such as uneven flow of the electrolyte and low current density, increasing energy consumption and reducing the working efficiency of the electrolytic cell.

[0056] For this reason, the present application provides an electrolytic cell to solve the technical problems existing in the prior art.

[0057] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings. The technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0058] In an embodiment of the present application, an electrolytic cell is provided, as Figure 1 shown. The electrolytic cell includes structures such as a bipolar plate 1, a flow channel plate 2, and a diffusion layer 3. The specific structures of each part and the specific cooperation relationship between the structures are well-known to those skilled in the art, and the additional structures and the connection relationships between the structures will not be described in detail. Among them, in the above structure, the function of the flow channel plate 2 is to form a flow channel structure for the medium to flow through. In some embodiments, the flow channel structure is integrated on the bipolar plate 1 as a whole structure; in other embodiments, the flow channel structure is constituted by a flow channel plate 2 independent of the bipolar plate 1. The present application will be described with the flow channel structure constituted by a flow channel plate 2 independent of the bipolar plate 1.

[0059] Referring to Figure 2 and Figure 3 , there are two flow channel plates 2. Specifically, the flow channel plate 2 includes a plurality of opening parts 21, a plurality of supporting parts 22, and a plurality of connecting parts 23. The opening parts 21, the supporting parts 22, and the connecting parts 23 are arranged along a first direction. Among them, the plurality of opening parts 21 are in a first plane, the plurality of supporting parts 22 are in a second plane, and the plurality of opening parts 21 and the plurality of supporting parts 22 are alternately arranged; adjacent opening parts 21 and supporting parts 22 are connected by connecting parts 23, so that the flow channel plate 2 as a whole forms a wavy structure. Exemplarily, one opening part 21 is connected to the adjacent supporting parts 22 on both sides through two connecting parts 23; a plurality of mass transfer holes 24 are formed in the opening part 21.

[0060] Two flow channel plates 2 are stacked, wherein for each flow channel plate 2 disposed between the bipolar plate 1 and the diffusion layer 3, its opening part 21 is closer to the diffusion layer 3 than the supporting part 22; that is, in the state where the flow channel plate 2 is disposed between the bipolar plate 1 and the diffusion layer 3, the opening part 21 of the flow channel plate 2 close to the diffusion layer 3 is in contact with the diffusion layer 3, and the supporting part 22 of the flow channel plate 2 close to the bipolar plate 1 is in contact with the bipolar plate 1.

[0061] Through the provided opening part 21, supporting part 22 and connecting part 23, the flow channel plate 2 forms a first type of channel 4 with a cross-section opening towards the second plane (i.e., towards the bipolar plate 1), and a second type of channel 5 with a cross-section opening towards the first plane (i.e., towards the diffusion layer 3); the extending directions of the first type of channel 4 and the second type of channel 5 are perpendicular to the first direction, and the first type of channel 4 and the second type of channel 5 are alternately arranged in the first direction.

[0062] Wherein, the cross-sections of the first type of channel 4 and the second type of channel 5 are perpendicular to their respective extending directions.

[0063] On the one hand, in the prior art, for the flow channels formed by the concave-convex structure, during the transmission of the medium therein, when the medium impacts the concave-convex structure during the transmission along the transmission path, turbulent flow will be generated, causing the medium to impact in different directions, which will generate strong turbulent flow on the medium, resulting in the problem of uneven medium in each area; moreover, the disturbance during the flow of the medium will also cause the problem of reduced medium transmission efficiency.

[0064] In this application, through the formed first type of channel 4 and the second type of channel 5, the resistance during the medium transmission process is reduced, the smoothness of the transmission process is improved, and the energy consumption is reduced; it can also improve the uniformity of the distribution of the fluid medium at each position, optimize the distribution and transmission path of the fluid medium, and improve the working performance of the electrolytic cell.

[0065] On the other hand, the flow channel plate 2 maintains a surface contact with the adjacent components, which can reduce the contact resistance to a greater extent, reduce the heat generation, that is, avoid the problem of excessive heat generation at the contact position, resulting in reduced electrolysis efficiency or even component damage; improve the energy transmission efficiency, and the working efficiency of the electrolytic cell is also higher.

[0066] Exemplarily, the multiple opening parts 21, supporting parts 22 and connecting parts 23 are integrally formed, and the flow channel plate 2 has better integrity; in other embodiments, a split structure can also be adopted and fixed by means of welding, bonding, etc.

[0067] In this application, the opening part 21, the supporting part 22, and the connecting part 23 are integrally formed. Compared with the way of fixing in a split structure, the flow channel plate 2, as a whole, has a smoother surface. The process of fluid medium transmission along the surface of the flow channel plate 2 is smoother, reducing the situation of fluid disturbance caused by uneven connections on the surface of the flow channel plate 2, which is beneficial to improving the stability of fluid medium transmission and the uniformity of distribution.

[0068] Moreover, since the flow channel plate 2 is integrally formed, the production and processing technology is also more convenient. Exemplarily, after performing processes such as pre-cleaning, pickling, and passivation treatment on the metal plate, a punching device is used to punch holes in the plate to form the required mass transfer holes 24, obtaining a perforated plate. Then, a corresponding mold is used to punch the perforated plate to form the final wavy structure. Additionally, the perforated plate can also be processed by rolling.

[0069] Certainly, the punching function can also be integrated into the mold, so that while the metal plate forms a wavy shape, the mass transfer holes 24 are punched, and the processing of the flow channel plate 2 can be completed through one punching.

[0070] Reference Figure 3 , the openings of the first type of channel 4 and the second type of channel 5 both open to both sides to form a flared structure, and their cross-sections are trapezoidal; the connecting part 23 is not perpendicular to the opening part 21 and the supporting part 22, but there is a certain inclination angle. The angle at which the connecting part 23 is bent relative to the opening part 21 is an acute angle, and the angle at which the connecting part 23 is bent relative to the supporting part 22 is also an acute angle. During the production process, it is easier to process and form, and the bending angle of the plate is reduced, reducing the damage to the strength of the plate. During the processing and forming process, the problem of plate damage is not easily caused.

[0071] Reference Figure 1 and Figure 3 , among the two flow channel plates 2, the flow channel plate 2 close to the bipolar plate 1 is set as the first flow channel plate 2a, and the flow channel plate 2 close to the diffusion layer 3 is set as the second flow channel plate 2b; the width of the first type of channel 4 on the first flow channel plate 2a is different from the width of the first type of channel 4 on the second flow channel plate 2b, and the width of the second type of channel 5 on the first flow channel plate 2a is also different from the width of the second type of channel 5 on the second flow channel plate 2b; for the convenience of description, the difference in the channel width between the first flow channel plate 2a and the second flow channel plate 2b is simply referred to as the first flow channel plate 2a and the second flow channel plate 2b having different gradients.

[0072] It should be noted that the widths of the first-type channels 4 and the second-type channels 5 refer to the dimensions in the first direction; in the case where the cross-sections of the first-type channels 4 and the second-type channels 5 are trapezoidal, the corresponding widths refer to the dimensions of the upper base or the lower base of the trapezoidal cross-section, or the average value of the two, as long as the measurement standards for each channel are the same.

[0073] When the first flow channel plate 2a and the second flow channel plate 2b are stacked, the opening part 21 of the first flow channel plate 2a contacts the supporting part 22 of the second flow channel plate 2b, thereby determining the relative positions of the first flow channel plate 2a and the second flow channel plate 2b. And the first flow channel plate 2a and the second flow channel plate 2b are set to have different gradients to avoid the situation where the opening part 21 of the first flow channel plate 2a completely adheres to the supporting part 22 of the second flow channel plate 2b.

[0074] In actual design, the gradients of the first flow channel plate 2a and the second flow channel plate 2b are differentially set, so that while the opening part 21 of the first flow channel plate 2a contacts the supporting part 22 of the second flow channel plate 2b, the mass transfer holes 24 on the first flow channel plate 2a avoid the supporting part 22 of the second flow channel plate 2b, preventing the situation where the supporting part 22 blocks the mass transfer holes 24; of course, it is not that no part of the supporting part 22 blocks the mass transfer holes 24, and it should be ensured that at least part of the mass transfer holes 24 is not blocked.

[0075] In this way, the first-type channels 4 on the first flow channel plate 2a achieve mass transfer with the first-type channels 4 and / or the second-type channels 5 on the second flow channel plate 2b through the mass transfer holes 24; it can further improve the uniformity of the medium in different regions of the flow channel plate 2.

[0076] Reference Figure 3 , the widths of the first-type channels 4 and the second-type channels 5 on each flow channel plate 2 are the same. The widths of the first-type channels 4 and the second-type channels 5 on the first flow channel plate 2a are D1, and the widths of the first-type channels 4 and the second-type channels 5 on the second flow channel plate 2b are D2, satisfying D1 > D2. In other embodiments, it can also be set as D2 > D1. The specific dimensions of D1 and D2 or the relative ratio between the two are adjusted according to different actual working conditions to achieve the optimal mass transfer efficiency.

[0077] In another embodiment, it is also possible to set the dimensions of the first-type channels 4 on each flow channel plate 2 to be different from the dimensions of the second-type channels 5.

[0078] In addition, the sizes of the mass transfer holes 24 on the adjacent flow channel plates 2 and the intervals between the mass transfer holes 24 on the adjacent flow channel plates 2 are different; on the one hand, the size of the mass transfer hole 24 in the first direction is designed corresponding to the width of the opening part 21 of the flow channel plate 2 where it is located. In addition, the size of the mass transfer hole 24 in the direction perpendicular to the first direction and the interval between adjacent mass transfer holes 24 can be differentially designed according to actual needs for the purpose of achieving the optimal mass transfer efficiency; exemplarily, different sizes and interval values are set, the corresponding mass transfer efficiency is tested and recorded, and the value with the highest mass transfer efficiency is selected as the standard.

[0079] Reference Figure 4 and Figure 5 , in one of the embodiments, both sides of the mass transfer hole 24 extend to the connecting part 23, so that the first type of channel 4 is directly communicated with the second type of channel 5. When the opening part 21 is in contact with the diffusion layer 3 or the opening part 21 is in contact with the supporting part 22 of the adjacent flow channel plate 2, the medium transfer between the first type of channel 4 and the second type of channel 5 on the same flow channel plate 2 can be realized through the mass transfer hole 24, which is beneficial to improving the uniformity of the medium in each part of the formed flow channel and improving the electrolysis efficiency of the electrolytic cell.

[0080] Compared with the prior art method of forming flow channels through concave-convex structures, in the embodiments of the present application, the flow channel plate 2 is in surface contact with the bipolar plate 1 and the flow channel plate 2 is in surface contact with the diffusion layer 3, which can reduce the contact resistance and improve the electrolysis efficiency. At the same time, to avoid excessive contact resistance between adjacent flow channel plates 2, it is necessary to ensure that the contact area between adjacent flow channel plates 2 is large enough.

[0081] Exemplarily, the contact area between the opening part 21 of the first flow channel plate 2a and the supporting part 22 of the second flow channel plate 2b is S1, and the area of the surface of the opening part 21 of the first flow channel plate 2a facing the second flow channel plate 2b is S2, and the two satisfy the following relationship: S1 / S2≥0.2; in the actual design process, S1 / S2 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and other values. It can effectively improve the working efficiency of the electrolytic cell, reduce energy consumption, and reduce the problem that the working efficiency decreases or even the components are damaged due to too high temperature at some contact positions.

[0082] In some other embodiments, the number of the flow channel plates 2 can also be set to three, four or other numbers. When the number of the flow channel plates 2 is set to three, four or more, different gradients are set for every two adjacent flow channel plates 2, that is, the sizes of the first type of channels 4 and the second type of channels 5 on two adjacent flow channel plates 2 are different. In the state where multiple flow channel plates 2 are stacked, channels with different gradients are formed in the direction between the bipolar plate 1 and the diffusion layer 3, and the channels with different gradients are communicated through the mass transfer holes 24, so as to reduce the unevenness at different positions during the transmission of the fluid medium, improve the uniformity of the medium distribution during the electrolysis process, and achieve higher electrolysis efficiency.

[0083] When the number of the flow channel plates 2 is three, four or more, the contact area S1 between the opening part 21 of any one of the flow channel plates 2 and the supporting part 22 of the adjacent flow channel plate 2, and the area S2 of the corresponding opening part 21 facing the adjacent flow channel plate 2 are defined. For the flow channel plate 2 directly contacting with the diffusion layer 3, its opening part 21 is in contact with the diffusion layer 3, and there is no need to be limited by the ratio of S1 to S2.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrolytic cell, characterized in that, It includes a bipolar plate, a diffusion layer, and at least two flow channel plates; Multiple said flow channel plates are stacked between the bipolar plate and the diffusion layer; The flow channel plate includes a plurality of opening parts, a plurality of supporting parts, and a plurality of connecting parts; The opening parts and the supporting parts are arranged at intervals along a first direction, and adjacent opening parts and supporting parts are connected by the connecting parts; The opening part and the adjacent connecting part enclose a first-type channel with a cross-section opening facing the bipolar plate; The supporting part and the adjacent connecting part enclose a second-type channel with a cross-section opening facing the diffusion layer; A plurality of mass transfer holes are formed in each said opening part.

2. The electrolytic cell according to claim 1, characterized in that, The plurality of opening parts, the supporting parts, and the connecting parts are integrally formed.

3. The electrolytic cell according to claim 1, characterized in that, The openings of the first-type channel and the second-type channel are of a flared structure.

4. The electrolytic cell according to claim 3, wherein The cross-sections of the first-type channel and the second-type channel are both trapezoidal.

5. The electrolytic cell according to claim 4, characterized in that, The angle at which the connecting part is bent relative to the opening part is an acute angle; The angle at which the connecting part is bent relative to the supporting part is also an acute angle.

6. The electrolytic cell according to claim 1, characterized in that, The widths of the first-type channels on every two adjacent flow channel plates are different; The widths of the second-type channels on two adjacent flow channel plates are also different; The width is the dimension of the first-type channel and the second-type channel in the first direction.

7. The electrolytic cell according to claim 6, characterized in that, There are two flow channel plates. The one close to the bipolar plate is the first flow channel plate, and the one close to the diffusion layer is the second flow channel plate; The widths of the first-type channels and the second-type channels on each flow channel plate are the same; The width of the first-type channel on the first flow channel plate is D1, and the width of the first-type channel on the second flow channel plate is D2, where D1 > D2.

8. The electrolytic cell according to claim 1, wherein, The area where the opening part of one of the flow channel plates abuts against the supporting part of the adjacent flow channel plate is S1, and the area of the corresponding opening part facing the adjacent flow channel plate is S2; where S1 / S2 ≥ 0.

2.

9. The electrolytic cell according to claim 1, characterized in that, The sizes of the mass transfer holes on two adjacent flow channel plates and the intervals between the mass transfer holes on two adjacent flow channel plates are different.

10. The electrolytic cell according to any one of claims 1-9, characterized in that, The two opposite ends of the mass transfer hole extend from the opening part to the connecting part connected to the opening part.

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