Bipolar plate structure for electrolytic bath and electrolytic bath

Abstract

The invention provides a bipolar plate structure for an electrolytic bath and the electrolytic bath. Each of the first sealing groove and the second sealing groove comprises a first sealing area and a second sealing area which are staggered along the boundary of the pole frame, and the length of the second sealing area in the direction away from the boundary of the pole frame is larger than that of the first sealing area in the direction away from the boundary of the pole frame. In other words, the catalyst coating film side of the anode frame and the catalyst coating film side of the cathode frame can be provided with corresponding flow guide areas on the premise that the sealing strips of the same structure are adopted, and the sealing strips of the same structure can be symmetrically sealed relative to the catalyst coating films. Therefore, the sealing reliability can be ensured on the premise that a diversion area is arranged on the polar plate frame.

Description

Technical Field

[0001] The present application relates to the technical field of electrolyzed water, and more particularly, to a bipolar plate structure and an electrolytic cell for an electrolytic cell. Background Art

[0002] In this field, an electrolytic cell is usually used to electrolyze water to obtain hydrogen. A bipolar plate structure is usually arranged in the electrolytic cell. In a proton exchange membrane (PEM) electrolytic cell, a traditional bipolar plate structure usually includes a plurality of identical bipolar plates arranged alternately, and a membrane electrode assembly (MEA) is arranged between every two bipolar plates. The membrane electrode assembly can be a multi-layer structure, for example, including a gas diffusion layer (GDL), a catalyst coated membrane (CCM), and a porous transport layer (PTL).

[0003] In order to reduce the process cost, a structure of a flat plate plus a three-dimensional (3D) mesh can be used to replace the traditional bipolar plate structure. At this time, since the 3D mesh only has regularly distributed holes and does not have an independently guiding flow field, a porous transport layer will be arranged on the plate frame, and a guiding region will also be provided to ensure the uniformity of the flow field. On the premise that a guiding region needs to be provided on the plate frame, how to achieve the sealing of the plate frame is an urgent problem to be solved. Summary of the Invention

[0004] The present application provides at least a bipolar plate structure and an electrolytic cell for an electrolytic cell. Since both the first sealing groove and the second sealing groove include a first sealing region and a second sealing region that are arranged alternately along the boundary of the pole frame, and the length of the second sealing region in the direction away from the boundary of the pole frame is greater than the length of the first sealing region in the direction away from the boundary of the pole frame, that is, on the premise that the catalyst coated membrane sides of the anode pole frame and the cathode pole frame can both adopt sealing strips with the same structure, corresponding guiding regions are provided, and the sealing strips with the same structure can be symmetrically sealed relative to the catalyst coated membrane, so as to ensure the sealing reliability on the premise that a guiding region is provided on the plate frame.

[0005] On the one hand, the present application provides a bipolar plate structure for an electrolytic cell, including:

[0006] A plurality of bipolar plate units arranged in sequence, and each bipolar plate unit in the plurality of bipolar plate units includes an anode pole frame assembly, a catalyst coated membrane, and a cathode pole frame assembly arranged in sequence;

[0007] The anode frame assembly includes an anode frame, a first sealing strip, and an anode porous transport layer. A plurality of anode cavity openings are respectively provided around the anode frame. A first sealing groove that surrounds each of the plurality of anode cavity openings and accommodates the first sealing strip is provided on the side of the catalyst coating film of the anode frame; the cathode frame assembly includes a cathode frame, a second sealing strip, and a cathode porous transport layer. A plurality of cathode cavity openings are respectively provided around the cathode frame. A second sealing groove that surrounds each of the plurality of cathode cavity openings and accommodates the second sealing strip is provided on the side of the catalyst coating film of the cathode frame;

[0008] The first sealing groove and the second sealing groove have the same structure, and both the first sealing groove and the second sealing groove include a first sealing area and a second sealing area that are alternately arranged along the frame boundary. The length of the second sealing area in the direction away from the frame boundary is greater than the length of the first sealing area in the direction away from the frame boundary;

[0009] The first sealing area on the first sealing groove corresponds to the first sealing area on the second sealing groove in the vertical projection on the plane where the catalyst coating film is located, and the second sealing area on the first sealing groove corresponds to the second sealing area on the second sealing groove in the vertical projection on the plane where the catalyst coating film is located, so that the first sealing strip and the second sealing strip are symmetrically sealed relative to the catalyst coating film.

[0010] In a possible implementation, a separator is further included between any two bipolar plate units arranged in sequence;

[0011] The anode frame assembly further includes a third sealing strip, and a third sealing groove that accommodates the third sealing strip is provided on the separator side of the anode frame; the cathode frame assembly further includes a fourth sealing strip, and a fourth sealing groove that accommodates the fourth sealing strip is provided on the separator side of the cathode frame;

[0012] The third sealing groove and the fourth sealing groove have the same structure, and both the third sealing groove and the fourth sealing groove include a first sealing area and a second sealing area that are alternately arranged;

[0013] For the anode frame, the first sealing area on the first sealing groove corresponds to the second sealing area on the third sealing groove in the vertical projection on the plane where the catalyst coating film is located, and the second sealing area on the first sealing groove corresponds to the first sealing area on the third sealing groove in the vertical projection on the plane where the catalyst coating film is located; for the cathode frame, the first sealing area on the second sealing groove corresponds to the second sealing area on the fourth sealing groove in the vertical projection on the plane where the catalyst coating film is located, and the second sealing area on the second sealing groove corresponds to the first sealing area on the fourth sealing groove in the vertical projection on the plane where the catalyst coating film is located.

[0014] In a possible implementation, the vertical projections of multiple anode orifices and multiple cathode orifices coincide in the plane where the catalyst-coated membrane is located.

[0015] In a possible implementation, the multiple anode orifices include multiple anode water inlets provided at the first end of the anode frame, multiple anode water outlets provided at the second end of the anode frame, and multiple anode hydrogen outlets provided at the third and fourth ends of the anode frame. The first end and the second end of the anode frame are not adjacent, and the third end and the fourth end of the anode frame are not adjacent;

[0016] The multiple cathode orifices include multiple cathode water inlets provided at the first end of the cathode frame, multiple cathode water outlets provided at the second end of the cathode frame, and multiple cathode hydrogen outlets provided at the third and fourth ends of the cathode frame. The first end, the second end, the third end, and the fourth end of the cathode frame respectively correspond to the first end, the second end, the third end, and the fourth end of the anode frame.

[0017] In a possible implementation, the multiple anode water inlets include two first anode water inlets and at least one second anode water inlet distributed between the two first anode water inlets. The area of the first anode water inlet is half of the area of the second anode water inlet; the multiple anode water outlets include two first anode water outlets and at least one second anode water outlet distributed between the two first anode water outlets. The area of the first anode water outlet is half of the area of the second anode water outlet; the multiple anode hydrogen outlets include two first anode hydrogen outlets provided at the third end of the anode frame and at least one second anode hydrogen outlet distributed between the two first anode hydrogen outlets, and two first anode hydrogen outlets provided at the fourth end of the anode frame and at least one second anode hydrogen outlet distributed between the two first anode hydrogen outlets. The area of the first anode hydrogen outlet is half of the area of the second anode hydrogen outlet;

[0018] The multiple cathode water inlets include two first cathode water inlets and at least one second cathode water inlet distributed between the two first cathode water inlets. The first cathode water inlet has the same structure as the first anode water inlet, and the second cathode water inlet has the same structure as the second anode water inlet; the multiple cathode water outlets include two first cathode water outlets and at least one second cathode water outlet distributed between the two first cathode water outlets. The first cathode water outlet has the same structure as the first anode water outlet, and the second cathode water outlet has the same structure as the second anode water outlet; the multiple cathode hydrogen outlets include two first cathode hydrogen outlets provided at the third end of the cathode frame and at least one second cathode hydrogen outlet distributed between the two first cathode hydrogen outlets, and two first cathode hydrogen outlets provided at the fourth end of the cathode frame and at least one second cathode hydrogen outlet distributed between the two first cathode hydrogen outlets. The first cathode hydrogen outlet has the same structure as the first anode hydrogen outlet, and the second cathode hydrogen outlet has the same structure as the second anode hydrogen outlet.

[0019] In a possible implementation, for the anode frame, a plurality of first anode water inlet flow channels are provided in the second sealing area corresponding to the anode water inlet on the partition side of the anode frame, and a plurality of second anode water inlet flow channels are provided outside the first sealing area corresponding to the anode water inlet on the catalyst coating film side of the anode frame. An anode water inlet through-flow hole penetrating the anode frame is provided between each first anode water inlet flow channel among the plurality of first anode water inlet flow channels and the corresponding second anode water inlet flow channel among the plurality of second anode water inlet flow channels. A plurality of anode water inlet flow distribution channels are provided between the plurality of second anode water inlet flow channels and the anode porous transport layer;

[0020] A plurality of first anode water outlet flow channels are provided in the second sealing area corresponding to the anode water outlet on the partition side of the anode frame, and a plurality of second anode water outlet flow channels are provided outside the first sealing area corresponding to the anode water outlet on the catalyst coating film side of the anode frame. An anode water outlet through-flow hole penetrating the anode frame is provided between each first anode water outlet flow channel among the plurality of first anode water outlet flow channels and the corresponding second anode water outlet flow channel among the plurality of second anode water outlet flow channels. A plurality of anode water outlet flow distribution channels are provided between the plurality of second anode water outlet flow channels and the anode porous transport layer.

[0021] In a possible implementation, for the cathode frame, a plurality of first cathode hydrogen outlet flow channels are provided in the second sealing area corresponding to the cathode hydrogen outlet on the partition side of the cathode frame, and a plurality of second cathode hydrogen outlet flow channels are provided outside the first sealing area corresponding to the cathode hydrogen outlet on the catalyst coating film side of the cathode frame. A cathode hydrogen outlet through-flow hole penetrating the cathode frame is provided between each first cathode hydrogen outlet flow channel among the plurality of first cathode hydrogen outlet flow channels and the corresponding second cathode hydrogen outlet flow channel among the plurality of second cathode hydrogen outlet flow channels. A plurality of cathode hydrogen outlet flow distribution channels are provided between the plurality of second cathode hydrogen outlet flow channels and the cathode porous transport layer.

[0022] In a possible implementation, the minimum value of the first number ratio of the number of the plurality of anode water inlet flow distribution channels to the number of the plurality of second anode water inlet flow channels is 3 and the maximum value is 6;

[0023] The minimum value of the second number ratio of the number of the plurality of anode water outlet flow distribution channels to the number of the plurality of second anode water outlet flow channels is 3 and the maximum value is 6;

[0024] The minimum value of the third number ratio of the number of the plurality of cathode hydrogen outlet flow distribution channels to the number of the plurality of second cathode hydrogen outlet flow channels is 3 and the maximum value is 6.

[0025] In a possible implementation, the minimum value of the flow channel width of the first flow channel of the anode water inlet, the second flow channel of the anode water inlet, the through-flow hole of the anode water inlet, the flow distribution channel of the anode water inlet, the first flow channel of the anode water outlet, the second flow channel of the anode water outlet, the through-flow hole of the anode water outlet, the flow distribution channel of the anode water outlet, the first flow channel of the cathode hydrogen outlet, the second flow channel of the cathode hydrogen outlet, the through-flow hole of the cathode hydrogen outlet, and the flow distribution channel of the cathode hydrogen outlet is 0.8 mm and the maximum value is 1.5 mm.

[0026] On the other hand, the present application provides an electrolytic cell, which includes the bipolar plate structure described in the foregoing embodiment.

[0027] In summary, the present application provides a bipolar plate structure and an electrolytic cell for an electrolytic cell, including: a plurality of bipolar plate units arranged in sequence, each of the plurality of bipolar plate units includes an anode frame assembly, a catalyst-coated membrane, and a cathode frame assembly arranged in sequence; the anode frame assembly includes an anode frame, a first sealing strip, and an anode porous transport layer, and a plurality of anode cavity openings are respectively arranged around the anode frame. A first sealing groove for accommodating the first sealing strip is arranged on the catalyst-coated membrane side of the anode frame around each of the plurality of anode cavity openings; the cathode frame assembly includes a cathode frame, a second sealing strip, and a cathode porous transport layer, and a plurality of cathode cavity openings are respectively arranged around the cathode frame. A second sealing groove for accommodating the second sealing strip is arranged on the catalyst-coated membrane side of the cathode frame around each of the plurality of cathode cavity openings; the first sealing groove and the second sealing groove have the same structure, and both the first sealing groove and the second sealing groove include a first sealing area and a second sealing area arranged alternately along the frame boundary. The length of the second sealing area in the direction away from the frame boundary is greater than the length of the first sealing area in the direction away from the frame boundary; the first sealing area on the first sealing groove corresponds to the first sealing area on the second sealing groove in the vertical projection on the plane where the catalyst-coated membrane is located, and the second sealing area on the first sealing groove corresponds to the second sealing area on the second sealing groove in the vertical projection on the plane where the catalyst-coated membrane is located, so that the first sealing strip and the second sealing strip are symmetrically sealed with respect to the catalyst-coated membrane. Since both the first sealing groove and the second sealing groove include a first sealing area and a second sealing area arranged alternately along the frame boundary and the length of the second sealing area in the direction away from the frame boundary is greater than the length of the first sealing area in the direction away from the frame boundary, that is, on the catalyst-coated membrane side of the anode frame and the catalyst-coated membrane side of the cathode frame, corresponding flow guiding areas can be set on the premise of using the same structure of the sealing strip, and the sealing strips with the same structure can be symmetrically sealed with respect to the catalyst-coated membrane, thereby ensuring the sealing reliability on the premise that a flow guiding area is provided on the plate frame.

[0028] Other advantages of the present application will be explained in more detail in conjunction with the following description and drawings.

[0029] It should be understood that the above description is only an overview of the technical solution of the present application, so as to generally understand the technical means of the present application, and then implement it in accordance with the content of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. The drawings here are incorporated into the specification and constitute a part of this specification. These drawings show the embodiments that conform to the present application and are used together with the specification to illustrate the technical solutions of the present application. It should be understood that the drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the protection scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 It is a schematic structural diagram of a bipolar plate structure for an electrolytic cell provided by an embodiment of the present application;

[0032] Figure 2 It is an assembly schematic diagram of a bipolar plate structure for an electrolytic cell provided by an embodiment of the present application;

[0033] Figure 3 It is a schematic diagram of the catalyst-coated film side of an anode frame provided by an embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the separator side of an anode frame provided by an embodiment of the present application;

[0035] Figure 5 It is a schematic diagram of the catalyst-coated film side of a cathode frame provided by an embodiment of the present application;

[0036] Figure 6 It is a schematic diagram of the separator side of a cathode frame provided by an embodiment of the present application;

[0037] Figure 7 It is a schematic diagram of the horizontal hydrogen transfer of a bipolar plate structure for an electrolytic cell provided by an embodiment of the present application;

[0038] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0039] Among them, 1001 - Anode frame assembly; 1101 - Anode frame; 1102 - First sealing strip; 1103 - Anode frame positioning hole; 1104 - Anode porous transport layer; 1112 - Third sealing strip; 1201 - First anode water inlet; 1202 - Second anode water inlet; 1203 - First flow channel of anode water inlet; 1204 - Through-flow hole of anode water inlet; 1205 - Second flow channel of anode water inlet; 1206 - Flow distribution channel of anode water inlet; 1211 - First anode water outlet; 1212 - Second anode water outlet; 1213 - First flow channel of anode water outlet; 1214 - Through-flow hole of anode water outlet; 1215 - Second flow channel of anode water outlet; 1216 - Flow distribution channel of anode water outlet; 1301 - First anode hydrogen outlet; 1302 - Second anode hydrogen outlet;

[0040] 2001 - Cathode frame assembly; 2101 - Cathode frame; 2102 - Second sealing strip; 2103 - Cathode frame positioning hole; 2104 - Cathode porous transport layer; 2112 - Fourth sealing strip; 2201 - First cathode water inlet; 2202 - Second cathode water inlet; 2211 - First cathode water outlet; 2212 - Second cathode water outlet; 2301 - First cathode hydrogen outlet; 2302 - Second cathode hydrogen outlet; 2303 - First flow channel of cathode hydrogen outlet; 2304 - Through-flow hole of cathode hydrogen outlet; 2305 - Second flow channel of cathode hydrogen outlet; 2306 - Flow distribution channel of cathode hydrogen outlet;

[0041] A1 - First sealing area; A2 - Second sealing area; 3001 - Catalyst coated membrane; 4001 - Separator. Detailed implementation manners

[0042] Hereinafter, the exemplary embodiments of the present application will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0043] In the description of the embodiments of the present application, it should be understood that terms such as "including" or "having" are intended to indicate the presence of the disclosed features, numbers, components, parts, or combinations thereof in the specification, and do not exclude the possibility of the presence of one or more other features, numbers, components, parts, or combinations thereof.

[0044] Unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0045] The terms "first", "second", etc. are used only to distinguish the same or similar technical features for the convenience of description, and should not be understood as indicating or implying the relative importance or quantity of these technical features. Thus, the features defined by "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the term "plurality" means two or more than two.

[0046] In order to reduce process costs, a flat plate plus 3D mesh structure can be used to replace the traditional bipolar plate structure. At this time, since the 3D mesh only has regularly distributed holes and does not have a flow field with autonomous flow control, a porous transmission layer will be arranged on the plate frame, and a flow guide area will also be set up to ensure the uniformity of the flow field. Under the premise that a flow guide area needs to be set on the plate frame, how to achieve the sealing of the plate frame is an urgent problem to be solved.

[0047] In view of this, the present application provides a bipolar plate structure for an electrolytic cell and an electrolytic cell, since the first sealing groove and the second sealing groove both include a first sealing area and a second sealing area alternately arranged along the pole frame boundary and the length of the second sealing area in the direction away from the pole frame boundary is greater than the length of the first sealing area in the direction away from the pole frame boundary, that is, the catalyst coating membrane side of the anode pole frame and the catalyst coating membrane side of the cathode pole frame can both be provided with corresponding guide areas on the premise of using sealing strips with the same structure, and the sealing strips with the same structure can be sealed symmetrically relative to the catalyst coating membrane, thereby ensuring the sealing reliability under the premise that the guide area is provided on the pole plate frame.

[0048] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0049] like Figures 1-6 As shown, the present application provides a bipolar plate structure for an electrolytic cell, comprising:

[0050] A plurality of bipolar plate units are arranged in sequence, and each of the plurality of bipolar plate units comprises an anode frame assembly 1001, a catalyst coating membrane 3001, and a cathode frame assembly 2001 which are arranged in sequence.

[0051] The anode frame assembly 1001 includes an anode frame 1101, a first sealing strip 1102, and an anode porous transport layer 1104. A plurality of anode cavity openings are respectively provided around the anode frame 1101. A first sealing groove that surrounds each of the plurality of anode cavity openings and accommodates the first sealing strip 1102 is provided on the catalyst coated membrane side of the anode frame 1101; the cathode frame assembly 2001 includes a cathode frame 2101, a second sealing strip 2102, and a cathode porous transport layer 2104. A plurality of cathode cavity openings are respectively provided around the cathode frame 2101. A second sealing groove that surrounds each of the plurality of cathode cavity openings and accommodates the second sealing strip 2102 is provided on the catalyst coated membrane side of the cathode frame 2101.

[0052] The anode frame assembly 1001 includes an anode porous transport layer 1104 and a plurality of anode cavity openings, and the cathode frame assembly 2001 includes a cathode porous transport layer 2104 and a plurality of cathode cavity openings. Through the anode porous transport layer 1104, the cathode porous transport layer 2104, the plurality of anode cavity openings, and the plurality of cathode cavity openings, water, oxygen, and hydrogen generated by the electrolytic reaction can flow longitudinally across the bipolar plate.

[0053] As Figure 3 and Figure 5 shown, the first sealing groove and the second sealing groove have the same structure, and both the first sealing groove and the second sealing groove include a first sealing area A1 and a second sealing area A2 that are alternately arranged along the frame boundary. The length of the second sealing area A2 in the direction away from the frame boundary is greater than the length of the first sealing area A1 in the direction away from the frame boundary.

[0054] In this application, the first sealing area A1 and the second sealing area A2 are alternately arranged along the frame boundary. For the first sealing area A1 and the second sealing area A2, the direction away from the frame boundary refers to the direction away from the frame boundary along which they are located.

[0055] It should be noted that since both the first sealing groove and the second sealing groove are designed around each corresponding anode cavity opening and each cathode cavity opening, and each anode cavity opening and each cathode cavity opening may have different sizes, the fact that the length of the second sealing area A2 in the direction away from the frame boundary is greater than the length of the first sealing area A1 in the direction away from the frame boundary does not mean that the area of the second sealing area A2 is greater than the area of the first sealing area A1. It only means that compared with the first sealing area A1, the end of the second sealing area A2 closer to the frame center is closer to the frame center than the end of the first sealing area A1 closer to the frame center.

[0056] The first sealing area A1 on the first sealing groove corresponds to the first sealing area A1 on the second sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located, and the second sealing area A2 on the first sealing groove corresponds to the second sealing area A2 on the second sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located, so that the first sealing strip 1102 and the second sealing strip 2102 are symmetrically sealed relative to the catalyst coating film 3001.

[0057] It should be noted that since both the first sealing groove and the second sealing groove in the present application include the first sealing area A1 and the second sealing area A2 arranged alternately along the boundary of the bipolar plate frame, and the length of the second sealing area A2 in the direction away from the boundary of the bipolar plate frame is greater than the length of the first sealing area A1 in the direction away from the boundary of the bipolar plate frame, that is, on both the catalyst coating film side of the anode bipolar plate frame 1101 and the catalyst coating film side of the cathode bipolar plate frame 2101, corresponding flow guiding areas can be set on the premise of using sealing strips with the same structure. For example, since one end of the first sealing area A1 close to the center of the bipolar plate frame is farther from the center of the bipolar plate frame than one end of the second sealing area A2 close to the center of the bipolar plate frame, more corresponding flow guiding areas can be set outside the first sealing area A1, and the sealing strips with the same structure can be symmetrically sealed relative to the catalyst coating film 3001, that is, full symmetric sealing can be achieved. Compared with asymmetric sealing, full symmetric sealing has higher sealing reliability, so that the sealing reliability can be ensured on the premise that flow guiding areas are provided on the bipolar plate frame.

[0058] In a possible implementation manner, in order to enable the support of the whole stack, a partition plate 4001 is further included between any two of the multiple bipolar plate units arranged in sequence.

[0059] The partition plate 4001 can be a metal flat partition plate, and the partition plate 4001 can provide support for the bipolar plate structure.

[0060] The anode bipolar plate frame assembly 1001 further includes a third sealing strip 1112, and a third sealing groove for accommodating the third sealing strip 1112 is provided on the partition plate side of the anode bipolar plate frame 1101; the cathode bipolar plate frame assembly 2001 further includes a fourth sealing strip 2112, and a fourth sealing groove for accommodating the fourth sealing strip 2112 is provided on the partition plate side of the cathode bipolar plate frame 2101.

[0061] The third sealing groove and the fourth sealing groove have the same structure, and both the third sealing groove and the fourth sealing groove include the first sealing area A1 and the second sealing area A2 arranged alternately.

[0062] For the anode frame 1101, the first sealing area A1 on the first sealing groove corresponds to the second sealing area A2 on the third sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located, and the second sealing area A2 on the first sealing groove corresponds to the first sealing area A1 on the third sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located; for the cathode frame 2101, the first sealing area A1 on the second sealing groove corresponds to the second sealing area A2 on the fourth sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located, and the second sealing area A2 on the second sealing groove corresponds to the first sealing area A1 on the fourth sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located.

[0063] It should be noted that as Figures 3-6 shown, the first sealing strip 1102, the second sealing strip 2102, the third sealing strip 1112, and the fourth sealing strip 2112 can all have the same structure. However, on the same frame, for example, for the anode frame 1101, the first sealing strip 1102 and the third sealing strip 1112 are arranged oppositely, so that the first sealing area A1 on the first sealing groove corresponds to the second sealing area A2 on the third sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located, and the second sealing area A2 on the first sealing groove corresponds to the first sealing area A1 on the third sealing groove in the vertical projection on the plane where the catalyst coating film 3001 is located. In this way, without changing the structure of the sealing strip, corresponding flow guiding areas can be set on both the separator side and the catalyst coating film side of the anode frame 1101. For example, corresponding flow guiding areas can be set in the second sealing area A2 on the separator side of the anode frame 1101 and outside the first sealing area A1 on the catalyst coating film side. Similarly, for the cathode frame 2101, the second sealing strip 2102 and the fourth sealing strip 2112 are arranged oppositely, so that corresponding flow guiding areas can be set on both the separator side and the catalyst coating film side of the cathode frame 2101 without changing the structure of the sealing strip.

[0064] It should be noted that since the structures of the sealing rubber strips are exactly the same, it means that only one set of molds is required for manufacturing and production. Thus, on the premise of ensuring reliable sealing, the cost reduction of the sealing rubber strip mold opening can reach 50%.

[0065] In a possible implementation manner, in order to better achieve the longitudinal transmission of water, oxygen, and hydrogen, the vertical projections of multiple anode openings and multiple cathode openings on the plane where the catalyst coating film 3001 is located coincide.

[0066] In a possible implementation manner, as Figure 3 and Figure 4As shown, the multiple anode orifices include multiple anode water inlets (1201, 1202) provided at the first end of the anode frame 1101, multiple anode water outlets (1211, 1212) at the second end of the anode frame 1101, and multiple anode hydrogen outlets (1301, 1302) at the third and fourth ends of the anode frame 1101. The first end and the second end of the anode frame 1101 are not adjacent, and the third end and the fourth end of the anode frame (1101) are not adjacent.

[0067] Correspondingly, as Figure 5 and Figure 6 shown, the multiple cathode orifices include multiple cathode water inlets (2201, 2202) provided at the first end of the cathode frame 2101, multiple cathode water outlets (2211, 2212) at the second end of the cathode frame 2101, and multiple cathode hydrogen outlets (2301, 2302) at the third and fourth ends of the cathode frame 2101. The first end, the second end, the third end, and the fourth end of the cathode frame 2101 respectively correspond to the first end, the second end, the third end, and the fourth end of the anode frame 1101.

[0068] In a possible implementation, the multiple anode water inlets (1201, 1202) include two first anode water inlets 1201 and at least one second anode water inlet 1202 distributed between the two first anode water inlets 1201. The area of the first anode water inlet 1201 is half of the area of the second anode water inlet 1202. The multiple anode water outlets (1211, 1212) include two first anode water outlets 1211 and at least one second anode water outlet 1212 distributed between the two first anode water outlets 1211. The area of the first anode water outlet 1211 is half of the area of the second anode water outlet 1212. The multiple anode hydrogen outlets (1301, 1302) include two first anode hydrogen outlets 1301 provided at the third end of the anode frame 1101 and at least one second anode hydrogen outlet 1302 distributed between the two first anode hydrogen outlets 1301, and two first anode hydrogen outlets 1301 provided at the fourth end of the anode frame 1101 and at least one second anode hydrogen outlet 1302 distributed between the two first anode hydrogen outlets 1301. The area of the first anode hydrogen outlet 1301 is half of the area of the second anode hydrogen outlet 1302.

[0069] The multiple cathode water inlets (2201, 2202) include two first cathode water inlets 2201 and at least one second cathode water inlet 2202 distributed between the two first cathode water inlets 2201. The first cathode water inlet 2201 has the same structure as the first anode water inlet 1201, and the second cathode water inlet 2202 has the same structure as the second anode water inlet 1202. The multiple cathode water outlets (2211, 2212) include two first cathode water outlets 2211 and at least one second cathode water outlet 2212 distributed between the two first cathode water outlets 2211. The first cathode water outlet 2211 has the same structure as the first anode water outlet 1211, and the second cathode water outlet 2212 has the same structure as the second anode water outlet 1212. The multiple cathode hydrogen outlets (2301, 2302) include two first cathode hydrogen outlets 2301 provided at the third end of the cathode frame 2101 and at least one second cathode hydrogen outlet 2302 distributed between the two first cathode hydrogen outlets 2301, and two first cathode hydrogen outlets 2301 provided at the fourth end of the cathode frame 2101 and at least one second cathode hydrogen outlet 2302 distributed between the two first cathode hydrogen outlets 2301. The first cathode hydrogen outlet 2301 has the same structure as the first anode hydrogen outlet 1301, and the second cathode hydrogen outlet 2302 has the same structure as the second anode hydrogen outlet 1302.

[0070] It should be noted that in the actual application of this application, there will be two types of cavity openings with different areas. There are 2 small cavity openings distributed at both ends, and the large cavity openings are distributed in the middle, and the number can be determined according to the length and width of the corresponding frame.

[0071] In a possible implementation, as Figure 3 and Figure 4 shown, in order to achieve the lateral transportation of water and oxygen, for the anode frame 1101, multiple first anode water inlet flow channels 1203 are provided in the second sealing area A2 corresponding to the anode water inlets (1201, 1202) on the partition side of the anode frame 1101, and multiple second anode water inlet flow channels 1205 are provided outside the first sealing area A1 corresponding to the anode water inlets (1201, 1202) on the catalyst coating film side of the anode frame 1101. An anode water inlet through-flow hole 1204 penetrating the anode frame 1101 is provided between each of the multiple first anode water inlet flow channels 1203 and the corresponding second anode water inlet flow channel 1205 among the multiple second anode water inlet flow channels 1205. Multiple anode water inlet flow distribution channels 1206 are provided between the multiple second anode water inlet flow channels 1205 and the anode porous transport layer 1104.

[0072] In the second sealing area A2 corresponding to the partition side of the anode frame 1101 and the anode water outlet (1211, 1212), a plurality of first anode water outlet flow channels 1213 are provided. Outside the first sealing area A1 corresponding to the catalyst coating film side of the anode frame 1101 and the anode water outlet (1211, 1212), a plurality of second anode water outlet flow channels 1215 are provided. Between each of the plurality of first anode water outlet flow channels 1213 and the corresponding second anode water outlet flow channel 1215 among the plurality of second anode water outlet flow channels 1215, an anode water outlet through-flow hole 1214 penetrating the anode frame 1101 is provided. Between the plurality of second anode water outlet flow channels 1215 and the anode porous transport layer 1104, a plurality of anode water outlet flow distribution channels 1216 are provided.

[0073] It should be noted that in this application, the corresponding multiple anode orifices and multiple cathode orifices can achieve the longitudinal transportation of water and oxygen. On this basis, in order to ensure the uniformity of the flow field and reduce the deterioration of heat and mass transfer, the anode frame assembly 1001 can achieve the lateral transportation of water and oxygen. Specifically, water and oxygen can sequentially pass through the anode water inlets (1201, 1202), the first anode water inlet flow channel 1203, the anode water inlet through-flow hole 1204, the second anode water inlet flow channel 1205, the anode water inlet flow distribution channel 1206 to the anode porous transport layer 1104, and then sequentially from the anode porous transport layer 1104, the anode water outlet flow distribution channel 1216, the second anode water outlet flow channel 1215, the anode water outlet through-flow hole 1214, the first anode water outlet flow channel 1213 to the anode water outlet (1211, 1212).

[0074] In this application, since both the first sealing groove and the third sealing groove of this application include the first sealing area A1 and the second sealing area A2 arranged alternately, on the premise that the structures of the first sealing groove and the third sealing groove are the same, corresponding diversion areas can be reserved on both the catalyst coating film side and the partition side of the anode frame 1101, so as to configure corresponding channels, thereby realizing the lateral transportation of water and oxygen on the anode frame 1101.

[0075] In a possible implementation manner, such as Figure 5 and Figure 6As shown in the figure, in order to achieve the lateral transport of hydrogen, for the cathode frame 2101, multiple first cathode hydrogen outlet flow channels 2303 are provided in the second sealing area A2 corresponding to the diaphragm side of the cathode frame 2101 and the cathode hydrogen outlets (2301, 2302). Multiple second cathode hydrogen outlet flow channels 2305 are provided outside the first sealing area A1 corresponding to the catalyst-coated film side of the cathode frame 2101 and the cathode hydrogen outlets (2301, 2302). A cathode hydrogen outlet through-flow hole 2304 penetrating the cathode frame 2101 is provided between each of the multiple first cathode hydrogen outlet flow channels 2303 in the multiple first cathode hydrogen outlet flow channels 2303 and the corresponding second cathode hydrogen outlet flow channel 2305 in the multiple second cathode hydrogen outlet flow channels 2305. Multiple cathode hydrogen outlet flow distribution channels 2306 are provided between the multiple second cathode hydrogen outlet flow channels 2305 and the cathode porous transport layer 2104.

[0076] It should be noted that in the present application, the corresponding multiple anode orifices and multiple cathode orifices can achieve the longitudinal transport of hydrogen. On this basis, in order to ensure the uniformity of the flow field and reduce the deterioration of heat and mass transfer, the cathode frame assembly 2001 can achieve the lateral transport of hydrogen. Specifically, as Figure 7 shown, hydrogen can sequentially flow from the cathode porous transport layer 2104, the cathode hydrogen outlet flow distribution channels 2306, the second cathode hydrogen outlet flow channels 2305, the cathode hydrogen outlet through-flow hole 2304, the first cathode hydrogen outlet flow channels 2303 to the cathode hydrogen outlets (2301, 2302).

[0077] In the present application, since both the second sealing groove and the fourth sealing groove of the present application include the first sealing area A1 and the second sealing area A2 arranged in an alternating manner, on the premise that the structures of the second sealing groove and the fourth sealing groove are the same, corresponding flow guiding areas can be reserved on both the catalyst-coated film side and the diaphragm side of the cathode frame 2101, so as to configure corresponding channels, thereby realizing the lateral transport of hydrogen on the cathode frame 2101.

[0078] In a possible implementation manner, the minimum value of the first number ratio corresponding to the number of multiple anode inlet flow distribution channels 1206 and the number of multiple second anode inlet flow channels 1205 is 3 and the maximum value is 6;

[0079] The minimum value of the second number ratio corresponding to the number of multiple anode outlet flow distribution channels 1216 and the number of multiple second anode outlet flow channels 1215 is 3 and the maximum value is 6;

[0080] The minimum value of the third number ratio corresponding to the number of multiple cathode hydrogen outlet flow distribution channels 2306 and the number of multiple second cathode hydrogen outlet flow channels 2305 is 3 and the maximum value is 6.

[0081] It should be noted that since a corresponding fluid distribution area is provided on the bipolar plate frame, the fluid in the main pipe can be evenly transferred to the entire reaction area by adjusting the number ratio of the flow channels and the distribution area channels, thereby improving the uniformity of heat transfer and mass transfer and avoiding large mass transfer polarization and local hot spots. In the practical application of this application, the number ratio between the number of flow channels in the distribution area and the number of the second flow channels is reasonably within the range of 3 to 6, and the specific number can be comprehensively considered according to the flow uniformity and the overall plate size.

[0082] In a possible implementation manner, the minimum value of the flow channel width of the first flow channel 1203 at the anode water inlet, the second flow channel 1205 at the anode water inlet, the through-flow hole 1204 at the anode water inlet, the flow distribution channel 1206 at the anode water inlet, the first flow channel 1213 at the anode water outlet, the second flow channel 1215 at the anode water outlet, the through-flow hole 1214 at the anode water outlet, the flow distribution channel 1216 at the anode water outlet, the first flow channel 2303 at the cathode hydrogen outlet, the second flow channel 2305 at the cathode hydrogen outlet, the through-flow hole 2304 at the cathode hydrogen outlet, and the flow distribution channel 2306 at the cathode hydrogen outlet is 0.8 mm and the maximum value is 1.5 mm.

[0083] It should be noted that since a corresponding fluid distribution area is provided on the bipolar plate frame, the fluid in the main pipe can be evenly transferred to the entire reaction area by adjusting the flow channel width, thereby improving the uniformity of heat transfer and mass transfer and avoiding large mass transfer polarization and local hot spots. In the practical application of this application, considering the flow resistance and the supporting effect on adjacent components, the flow channel width is reasonably within the range of 0.8 to 1.5 mm.

[0084] In a possible implementation manner, the anode bipolar plate frame 1101 can be provided with anode bipolar plate frame positioning holes 1103, and the cathode bipolar plate frame 2101 can be provided with cathode bipolar plate frame positioning holes 2103, so as to realize the positioning cooperation between the anode bipolar plate frame assembly 1001 and the cathode bipolar plate frame assembly 2001.

[0085] The embodiment of this application also provides an electrolytic cell, which includes the bipolar plate structure described in any one of the foregoing embodiments.

[0086] In the description of this specification, the descriptions made with reference to the terms "some possible embodiments", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application, and the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0087] Although the spirit and principles of the present application have been described above with reference to several specific embodiments, it should be understood that the present application is not limited to the specific embodiments disclosed, and the division of each aspect does not mean that the features in these aspects cannot be combined. The present application aims to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A bipolar plate structure for an electrolytic cell, characterized in that: include: A plurality of bipolar plate units are arranged in sequence, each of the plurality of bipolar plate units comprising an anode pole frame assembly (1001), a catalyst coating membrane (3001), and a cathode pole frame assembly (2001) which are arranged in sequence; The anode pole frame assembly (1001) comprises an anode pole frame (1101), a first sealing strip (1102) and an anode porous transport layer (1104); a plurality of anode cavities are respectively arranged around the anode pole frame (1101); and a first sealing groove surrounding each of the plurality of anode cavities and accommodating the first sealing strip (1102) is arranged on the catalyst coating membrane side of the anode pole frame (1101); the cathode pole frame assembly (2001) comprises a cathode pole frame (2101), a second sealing strip (2102) and a cathode porous transport layer (2104); a plurality of cathode cavities are respectively arranged around the cathode pole frame (2101); and a second sealing groove surrounding each of the plurality of cathode cavities and accommodating the second sealing strip (2102) is arranged on the catalyst coating membrane side of the cathode pole frame (2101); The first sealing groove and the second sealing groove have the same structure, and both the first sealing groove and the second sealing groove include a first sealing area (A1) and a second sealing area (A2) arranged alternately along the pole frame boundary, and the length of the second sealing area (A2) in a direction away from the pole frame boundary is greater than the length of the first sealing area (A1) in a direction away from the pole frame boundary; The first sealing area (A1) on the first sealing groove corresponds to the vertical projection of the first sealing area (A1) on the second sealing groove on the plane where the catalyst coating membrane (3001) is located, and the second sealing area (A2) on the first sealing groove corresponds to the vertical projection of the second sealing area (A2) on the second sealing groove on the plane where the catalyst coating membrane (3001) is located, so that the first sealing strip (1102) and the second sealing strip (2102) are sealed symmetrically relative to the catalyst coating membrane (3001).

2. The bipolar plate structure for an electrolytic cell according to claim 1, characterized in that: A separator (4001) is further provided between any two bipolar plate units among the plurality of bipolar plate units arranged in sequence; The anode pole frame assembly (1001) further comprises a third sealing strip (1112), and a third sealing groove for accommodating the third sealing strip (1112) is provided on the partition side of the anode pole frame (1101); the cathode pole frame assembly (2001) further comprises a fourth sealing strip (2112), and a fourth sealing groove for accommodating the fourth sealing strip (2112) is provided on the partition side of the cathode pole frame (2101); The third sealing groove and the fourth sealing groove have the same structure, and both the third sealing groove and the fourth sealing groove include the first sealing area (A1) and the second sealing area (A2) which are arranged alternately; For the anode pole frame (1101), the first sealing area (A1) on the first sealing groove corresponds to the vertical projection of the second sealing area (A2) on the third sealing groove on the plane where the catalyst coating membrane (3001) is located, and the second sealing area (A2) on the first sealing groove corresponds to the vertical projection of the first sealing area (A1) on the third sealing groove on the plane where the catalyst coating membrane (3001) is located; for the cathode pole frame (2101), the first sealing area (A1) on the second sealing groove corresponds to the vertical projection of the second sealing area (A2) on the fourth sealing groove on the plane where the catalyst coating membrane (3001) is located, and the second sealing area (A2) on the second sealing groove corresponds to the vertical projection of the first sealing area (A1) on the fourth sealing groove on the plane where the catalyst coating membrane (3001) is located.

3. The bipolar plate structure for an electrolytic cell according to claim 2, characterized in that: The vertical projections of the multiple anode cavity openings and the multiple cathode cavity openings on the plane where the catalyst coating membrane (3001) is located coincide with each other.

4. The bipolar plate structure for an electrolytic cell according to claim 3, characterized in that: The multiple anode cavity openings include multiple anode water inlets (1201, 1202) arranged at the first end of the anode pole frame (1101), multiple anode water outlets (1211, 1212) at the second end of the anode pole frame (1101), and multiple anode hydrogen outlets (1301, 1302) at the third end and the fourth end of the anode pole frame (1101), the first end of the anode pole frame (1101) is not adjacent to the second end, and the third end of the anode pole frame (1101) is not adjacent to the fourth end; The multiple cathode cavity openings include multiple cathode water inlets (2201, 2202) arranged at the first end of the cathode pole frame (2101), multiple cathode water outlets (2211, 2212) at the second end of the cathode pole frame (2101), and multiple cathode hydrogen outlets (2301, 2302) at the third and fourth ends of the cathode pole frame (2101), and the first end, second end, third end and fourth end of the cathode pole frame (2101) correspond to the first end, second end, third end and fourth end of the anode pole frame (1101), respectively.

5. The bipolar plate structure for an electrolytic cell according to claim 4, characterized in that: The multiple anode water inlets (1201, 1202) include two first anode water inlets (1201) and at least one second anode water inlet (1202) distributed between the two first anode water inlets (1201), and the area of ​​the first anode water inlet (1201) is half of the area of ​​the second anode water inlet (1202); the multiple anode water outlets (1211, 1212) include two first anode water outlets (1211) and at least one second anode water outlet (1212) distributed between the two first anode water outlets (1211), and the area of ​​the first anode water outlet (1211) is half of the area of ​​the second anode water outlet (1212). 212); the plurality of anode hydrogen outlets (1301, 1302) include two first anode hydrogen outlets (1301) arranged at the third end of the anode pole frame (1101) and at least one second anode hydrogen outlet (1302) distributed between the two first anode hydrogen outlets (1301), and two first anode hydrogen outlets (1301) arranged at the fourth end of the anode pole frame (1101) and at least one second anode hydrogen outlet (1302) distributed between the two first anode hydrogen outlets (1301), and the area of ​​the first anode hydrogen outlet (1301) is half of the area of ​​the second anode hydrogen outlet (1302); The multiple cathode water inlets (2201, 2202) include two first cathode water inlets (2201) and at least one second cathode water inlet (2202) distributed between the two first cathode water inlets (2201), the first cathode water inlet (2201) and the first anode water inlet (1201) having the same structure, and the second cathode water inlet (2202) and the second anode water inlet (1202) having the same structure; the multiple cathode water outlets (2211, 2212) include two first cathode water outlets (2211) and at least one second cathode water outlet (2212) distributed between the two first cathode water outlets (2211), the first cathode water outlet (2211) and the first anode water outlet (1211) having the same structure, 2212) has the same structure as the second anode water outlet (1212); the multiple cathode hydrogen outlets (2301, 2302) include two first cathode hydrogen outlets (2301) arranged at the third end of the cathode pole frame (2101) and at least one second cathode hydrogen outlet (2302) distributed between the two first cathode hydrogen outlets (2301), and two first cathode hydrogen outlets (2301) arranged at the fourth end of the cathode pole frame (2101) and at least one second cathode hydrogen outlet (2302) distributed between the two first cathode hydrogen outlets (2301), the first cathode hydrogen outlet (2301) has the same structure as the first anode hydrogen outlet (1301), and the second cathode hydrogen outlet (2302) has the same structure as the second anode hydrogen outlet (1302).

6. The bipolar plate structure for an electrolytic cell according to claim 4, characterized in that: With respect to the anode pole frame (1101), a plurality of anode water inlet first flow channels (1203) are arranged in a second sealing area (A2) corresponding to the anode water inlet (1201, 1202) on the partition side of the anode pole frame (1101), and a plurality of anode water inlet second flow channels (1205) are arranged outside a first sealing area (A1) corresponding to the anode water inlet (1201, 1202) on the catalyst coating membrane side of the anode pole frame (1101). An anode water inlet flow hole (1204) penetrating the anode pole frame (1101) is provided between each anode water inlet first flow channel (1203) in the through channel (1203) and a corresponding anode water inlet second flow channel (1205) in the plurality of anode water inlet second flow channels (1205), and a plurality of anode water inlet flow distribution channels (1206) are provided between the plurality of anode water inlet second flow channels (1205) and the anode porous transport layer (1104); A plurality of anode water outlet first circulation channels (1213) are arranged in a second sealing area (A2) corresponding to the anode water outlet (1211, 1212) on the partition side of the anode pole frame (1101), and a plurality of anode water outlet second circulation channels (1215) are arranged outside a first sealing area (A1) corresponding to the anode water outlet (1211, 1212) on the catalyst coating membrane side of the anode pole frame (1101). 3) is provided between each anode water outlet first circulation channel (1213) and a corresponding anode water outlet second circulation channel (1215) among the plurality of anode water outlet second circulation channels (1215), and an anode water outlet flow hole (1214) penetrating the anode pole frame (1101) is provided, and a plurality of anode water outlet circulation distribution channels (1216) are provided between the plurality of anode water outlet second circulation channels (1215) and the anode porous transport layer (1104).

7. The bipolar plate structure for an electrolytic cell according to claim 6, characterized in that: For the cathode pole frame (2101), a plurality of cathode hydrogen outlet first flow channels (2303) are arranged in a second sealed area (A2) corresponding to the cathode hydrogen outlet (2301, 2302) on the separator side of the cathode pole frame (2101), and a plurality of cathode hydrogen outlet second flow channels (2305) are arranged outside a first sealed area (A1) corresponding to the cathode hydrogen outlet (2301, 2302) on the catalyst coating membrane side of the cathode pole frame (2101). A cathode hydrogen outlet flow hole (2304) penetrating the cathode pole frame (2101) is provided between each cathode hydrogen outlet first flow channel (2303) in the through channel (2303) and a corresponding cathode hydrogen outlet second flow channel (2305) in the plurality of cathode hydrogen outlet second flow channels (2305), and a plurality of cathode hydrogen outlet flow distribution channels (2306) are provided between the plurality of cathode hydrogen outlet second flow channels (2305) and the cathode porous transport layer (2104).

8. The bipolar plate structure for an electrolytic cell according to claim 7, characterized in that: The first number ratio corresponding to the number of the plurality of anode water inlet circulation distribution channels (1206) and the number of the plurality of anode water inlet second circulation channels (1205) has a minimum value of 3 and a maximum value of 6; The minimum value of the second number ratio corresponding to the number of the plurality of anode water outlet circulation distribution channels (1216) and the number of the plurality of anode water outlet second circulation channels (1215) is 3 and the maximum value is 6; The minimum value of the third number ratio corresponding to the number of the plurality of cathode hydrogen outlet flow distribution channels (2306) and the number of the plurality of cathode hydrogen outlet second flow channels (2305) is 3 and the maximum value is 6.

9. The bipolar plate structure for an electrolytic cell according to claim 7, characterized in that: The minimum flow channel width of the anode water inlet first flow channel (1203), the anode water inlet second flow channel (1205), the anode water inlet flow hole (1204), the anode water inlet flow distribution channel (1206), the anode water outlet first flow channel (1213), the anode water outlet second flow channel (1215), the anode water outlet flow hole (1214), the anode water outlet flow distribution channel (1216), the cathode hydrogen outlet first flow channel (2303), the cathode hydrogen outlet second flow channel (2305), the cathode hydrogen outlet flow hole (2304) and the cathode hydrogen outlet flow distribution channel (2306) is 0.8 mm and the maximum flow channel width is 1.5 mm.

10. An electrolytic cell comprising the bipolar plate structure according to any one of claims 1 to 9.

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