PEM electrolytic bath pole plate structure and single cell

Abstract

The invention discloses a PEM electrolytic bath pole plate structure and a single cell, and relates to the technical field of electrolytic baths, the PEM electrolytic bath pole plate structure comprises a light plate, a cathode runner net, a cathode titanium felt, an anode runner net and an anode titanium felt, the cathode runner net and the cathode titanium felt are sequentially arranged on the side face of one side of the light plate from inside to outside, and the anode runner net and the anode titanium felt are sequentially arranged on the side face of the other side of the light plate from inside to outside. And the cathode titanium felt, the cathode runner net, the light plate, the anode runner net and the anode titanium felt form an integrated structure. According to the invention, the stacking assembly process can be simplified, the processing cost is reduced, and the processing efficiency is improved.

Description

Technical Field

[0001] The present invention application relates to the technical field of electrolytic cells, and more particularly, to a PEM electrolytic cell plate structure and a single cell. Background Art

[0002] As one of the important components of a PEM electrolytic cell, the plate plays roles including: supporting the membrane electrode and the gas diffusion layer, dividing and sealing gas and liquid, uniformly transporting and distributing reactants and products, collecting current and conducting electrons, conducting heat and uniformly controlling the temperature of the reaction zone, etc.

[0003] Currently, on traditional electrolytic cells, the flow field structure on the plate is processed by an etching process. However, using this process has a high cost and a long processing cycle, resulting in low production efficiency. At the same time, when the flow field structure and the gas diffusion part are assembled, they are in contact with each other, and not only are they prone to assembly misalignment, but also the contact resistance is large, reducing the overall performance. Therefore, using this processing method is only suitable for early proofing and is not conducive to later mass production. Summary of the Invention

[0004] The problem solved by the present invention application is how to improve processing efficiency, reduce processing costs, while reducing contact resistance and improving performance, so as to facilitate later mass production.

[0005] In a first aspect, the present invention application provides a PEM electrolytic cell plate structure, including a plain plate, a cathode flow field net, a cathode titanium felt, an anode flow field net, and an anode titanium felt. The plain plate has two opposite sides. On one side of the plain plate, the cathode flow field net and the cathode titanium felt are sequentially arranged from the inside to the outside. On the other side of the plain plate, the anode flow field net and the anode titanium felt are sequentially arranged from the inside to the outside, and the cathode titanium felt, the cathode flow field net, the plain plate, the anode flow field net, and the anode titanium felt form an integrated structure.

[0006] Optionally, a cathode titanium mesh is further provided between the cathode flow field net and the cathode titanium felt, and / or an anode titanium mesh is further provided between the anode flow field net and the anode titanium felt. The cathode titanium felt, the cathode titanium mesh, the cathode flow field net, the plain plate, the anode flow field net, the anode titanium mesh, and the anode titanium felt are sequentially arranged and form an integrated structure.

[0007] Optionally, the flow channel directions of the anode flow field net and the cathode flow field net are perpendicular to each other.

[0008] Optionally, both the anode flow field net and the cathode flow field net are made by a stamping forming method.

[0009] Optionally, the anode titanium felt, the anode titanium mesh, and the anode flow channel mesh have the same external dimensions, the cathode titanium felt, the cathode titanium mesh, and the cathode flow channel mesh have the same external dimensions, and the external dimensions of the anode titanium felt are larger than those of the cathode titanium felt.

[0010] In a second aspect, the present invention provides a single cell, including a PEM electrolytic cell plate structure according to any one of the first aspects above.

[0011] Optionally, the single cell further includes a membrane electrode and a frame. The plate structure includes two. The front side of the frame is sequentially and sealingly connected to the membrane electrode and the anode side of one of the plate structures. One side of the membrane electrode is sealingly connected to the front side of the frame through a seal, and the other side of the membrane electrode is tightly sealed by the plate structure in contact therewith. The back side of the frame is sealingly connected to the cathode side of the other plate structure through the seal.

[0012] Optionally, the frame is a plastic frame structure.

[0013] Optionally, the seal includes an inner rubber seal and an outer rubber seal. One side of the membrane electrode is sealingly connected to the front side of the frame through the inner rubber seal. The front side of the frame is also sealingly connected to one of the plate structures through the outer rubber seal. The back side of the frame is sealingly connected to the cathode side of the other plate structure through the outer rubber seal.

[0014] The beneficial effect of the PEM electrolytic cell plate structure of the present invention is that the light plate constituting the plate and the cathode titanium felt, the cathode flow channel mesh, the anode titanium felt, and the anode flow channel mesh are arranged in an integrated structure. Compared with the split structure of the prior art, the stacking and assembly process is simplified, the processing cost is reduced, the processing efficiency is improved, and at the same time, the contact resistance between components is reduced, which is beneficial to improving the overall performance.

[0015] The beneficial effect of the single cell of the present invention is that the membrane electrode is arranged between the anode side of a plate structure and the frame. One side of it is sealingly connected to the frame through a seal, and the other side is tightly sealed by the plate structure. Thus, the size of the proton membrane can be reduced to be close to the area of the reaction zone, thereby greatly improving the area utilization rate of the proton membrane and reducing the material cost. Description of the Drawings

[0016] Figure 1 is an exploded structural schematic diagram of the plate structure of the present invention; Figure 2 is for the present invention Figure 1 is an enlarged schematic diagram of the structure at A in Figure 3 is an overall structural schematic diagram of the single cell of the present invention; Figure 4 Cross-sectional view taken along line A-A of this invention application Figure 3 ; Figure 5 This invention application Figure 4 Schematic enlarged view of the structure at position C; Figure 6 Schematic exploded view of a single cell of this invention application; Figure 7 This invention application Figure 6 Schematic enlarged view of the structure at position B in; Figure 8 Schematic front view of the frame of this invention application; Figure 9 Schematic back view of the frame of this invention application; Explanation of reference numerals in the drawings 1. Light plate; 11. Flow port; 2. Anode flow channel network; 3. Cathode flow channel network; 4. Anode titanium mesh; 5. Cathode titanium mesh; 6. Anode titanium felt; 7. Cathode titanium felt; 8. Membrane electrode; 81. Positioning hole; 9. Frame; 91. Anode flow port; 911. Anode cross-over flow channel; 92. Cathode flow port; 921. Cathode cross-over flow channel; 93. Inner sunken groove; 931. Positioning protrusion; 94. Inner rubber sealing groove; 95. Outer rubber sealing groove on the cathode side; 96. Outer rubber sealing groove on the anode side; 97. Assembly positioning hole; 10. Sealing member; 101. Inner rubber sealing member; 102. Outer rubber sealing member. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0018] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings of this application specification, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from specific components. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application specification, "a plurality of" means two or more.

[0019] Next, this application will be further described in conjunction with the accompanying drawings and embodiments.

[0020] Example 1. A PEM electrolyzer plate structure provided in this example is as follows Figure 1 shown, including a plain plate 1, a cathode flow channel mesh 3, a cathode titanium felt 7, an anode flow channel mesh 2, and an anode titanium felt 6. The plain plate 1 has two opposite sides. On the corresponding positions of one side of the plain plate 1, the cathode flow channel mesh 3 and the cathode titanium felt 7 are sequentially arranged from the inside to the outside. On the corresponding positions of the other side of the plain plate 1, the anode flow channel mesh 2 and the anode titanium felt 6 are sequentially arranged from the inside to the outside. Moreover, the cathode titanium felt 7, the cathode flow channel mesh 3, the plain plate 1, the anode flow channel mesh 2, and the anode titanium felt 6 are constructed into an integrated structure.

[0021] As can be seen from the above, compared with the prior art, in this invention application, the cathode side of the plain plate 1 is integrally designed with the cathode flow channel mesh 3 and the cathode titanium felt 7, and its anode side is integrally designed with the anode flow channel mesh 2 and the anode titanium felt 6, and finally an integrated structure is formed. By integrating each component into one design, the assembly difficulty is reduced, and at the same time, the workload of subsequent stacking is greatly simplified, avoiding problems such as assembly misalignment or unreliable connection, and improving the assembly efficiency and assembly accuracy. Secondly, due to the integrated design of the integrated plate structure, the traditional method of processing flow channels by etching on the plain plate 1 is abandoned. This not only reduces the material thickness of the plain plate 1, saves the material usage cost, but also reduces the complexity of processing and manufacturing. Finally, the design of the integrated plate structure can also reduce the contact resistance between components and improve the overall performance.

[0022] Optionally, the above plain plate 1 is made of a titanium substrate. Titanium has excellent corrosion resistance, low initial resistivity, good mechanical strength, and light weight. In this invention application, the titanium substrate is processed into corresponding dimensions by laser cutting. According to the traditional usage method of the plate, precious metals or platinum group metals need to be plated on the titanium surface, which not only makes the processing technology more complex but also increases the material cost. However, in this invention application, the plain plate 1 made of a titanium substrate omits the plating process, simplifies the processing technology, and reduces the processing cost. At the same time, compared with the traditional method of processing flow channels by etching on the plate surface, this invention application directly adopts the plain plate structure, which can reduce the material thickness and greatly reduce the material usage cost.

[0023] Optionally, both the anode titanium felt 6 and the cathode titanium felt 7 are made of porous titanium fiber felts, which are used to increase the surface area and improve the reaction efficiency.

[0024] Optionally, the anode flow channel network 2 and the cathode flow channel network 3 adopt a titanium mesh structure. The flow channels are processed by stamping a plate mesh, and the processing technology is simple and the cost is not high. The flow channels of the anode flow channel network 2 and the cathode flow channel network 3 can adopt dot-shaped flow channels, parallel flow channels, serpentine flow channels, needle-shaped flow channels, interdigitated flow channels, etc. In this invention application, both the anode flow channel network 2 and the cathode flow channel network 3 adopt parallel flow channels. Specifically, as Figure 2 , which is an enlarged view of a partial structure of the anode flow channel network. It can be seen from the figure that the anode flow channel network includes a plurality of first grooves 21 arranged horizontally. Each first groove 21 extends from one end of the anode flow channel network 2 to the other end. The plurality of first grooves 21 are arranged in parallel at intervals from top to bottom, forming a parallel flow channel. The parallel flow channel can improve the fluid velocity and the uniformity of concentration distribution. The cathode flow channel network 3 includes a plurality of second grooves arranged vertically. Each second groove extends from one end of the cathode flow channel network 3 to the other end. The plurality of second grooves are arranged in parallel at intervals from left to right, forming a parallel flow channel.

[0025] Optionally, the flow channel directions of the anode flow channel network 2 and the cathode flow channel network 3 are perpendicular to each other. That is, when arranging, if, as described in this invention application, the flow channel direction on the anode flow channel network 2 is the horizontal direction, then the flow channel direction of the corresponding cathode flow channel network 3 should be arranged vertically. Conversely, if the flow channel direction on the anode flow channel network 2 is the vertical direction, then the flow channel direction of the corresponding cathode flow channel network 3 should be the horizontal direction, so as to achieve uniform transmission and distribution of reactants and products.

[0026] Optionally, a cathode titanium mesh 5 is further provided between the cathode flow channel network 3 and the cathode titanium felt 7, and / or an anode titanium mesh 4 is further provided between the anode flow channel network 2 and the anode titanium felt 6. The cathode titanium felt 7, the cathode titanium mesh 5, the cathode flow channel network 3, the light plate 1, the anode flow channel network 2, the anode titanium mesh 4, and the anode titanium felt 6 are arranged in sequence, and are first integrally welded by a hot pressing and sintering process to form an integral structure, and then the outer surface of the integral structure is processed by PVD coating.

[0027] In the actual application process, if the anode titanium felt 6 and the cathode titanium felt 7 are directly in contact with the anode flow channel net 2 and the cathode flow channel net 3 respectively to form an integrated structure, due to the uneven flow channel structures provided on the anode flow channel net 2 and the cathode flow channel net 3, not only is it easy to press and deform the anode titanium net 4 and the cathode titanium net 5 in contact with them, affecting their performance, but also the welding area between the flow channel net and the corresponding titanium net is relatively small, easily leading to the risk of seal failure. And the cathode titanium net 5 provided between the cathode flow channel net 3 and the cathode titanium felt 7, and / or the anode titanium net 4 provided between the anode flow channel net 2 and the anode titanium felt 6, the anode titanium net 4 and the cathode titanium net 5 are made of titanium metal, have a mesh structure, and are formed by weaving, stamping or welding processes, and have excellent characteristics such as high mechanical strength and corrosion resistance. Therefore, in this invention application, the anode titanium net 4 and the cathode titanium net 5 can not only play a supporting role to prevent the anode flow channel net 2 and the cathode flow channel net 3 in contact with them from being pressed and deformed, but also can increase the effective welding area between the flow channel net and the titanium felt in contact with them, ensure the sealing performance of the welding, effectively prevent the risk of seal failure, and at the same time effectively increase the contact area between various components, reduce the contact resistance between various components, and ensure the performance of the plate structure.

[0028] Optionally, the outer dimensions of the anode titanium felt 6, the anode titanium net 4 and the anode flow channel net 2 are the same, that is, the length and width dimensions are the same, the outer dimensions of the cathode titanium felt 7, the cathode titanium net 5 and the cathode flow channel net 3 are the same, and the outer dimension of the anode titanium felt 6 is larger than the outer dimension of the cathode titanium felt 7. Since the outer dimensions of the anode titanium felt 6, the anode titanium net 4 and the anode flow channel net 2 on the anode side of the light plate 1 are the same, and the outer dimensions of the cathode titanium felt 7, the cathode titanium net 5 and the cathode flow channel net 3 on the cathode side of the light plate 1 are the same, the outer dimensions of the components on the anode side of the light plate 1 are larger than the outer dimensions of the components on the cathode side of the light plate 1. This setting is designed to ensure the sealing performance of the integration of the plate and other components, and its specific function will be introduced in the following single-cell structure.

[0029] The processing method of the PEM electrolyzer plate integrated structure includes the following steps: Step 1, the light plate uses a titanium plate substrate and is processed into corresponding dimensions by laser cutting. Step 2, the cathode flow channel net and the anode flow channel net are respectively processed into corresponding shapes by stamping. Step 3, on one side surface of the light plate, the cathode flow channel net, the cathode titanium net, and the cathode titanium felt are arranged in sequence from inside to outside. On the other side surface of the light plate, the anode flow channel net, the anode titanium net, and the anode titanium felt are arranged in sequence from inside to outside. After being assembled in sequence, an integrated welding is carried out through a hot pressing and sintering process to form an integrated plate structure. Step 4, perform PVD coating on the outer surface of the above integrated plate structure to complete the processing.

[0030] Embodiment 2. Embodiment 2 of the present invention application provides a single cell, including the plate structure as described above.

[0031] The beneficial effects of the single cell in this embodiment compared with the prior art are the same as those of the above-described plate structure, and will not be elaborated here.

[0032] Optionally, as Figures 3 to 6 shown, the single cell further includes a membrane electrode 8 and a frame 9. The plate structure includes two. The front side of the frame 9 is sequentially and hermetically connected to the membrane electrode 8 and the anode side of one plate structure. The membrane electrode 8 is hermetically connected to the front side of the frame 9 through a seal 10 on the side close to the front side of the frame 9. The other side of the membrane electrode 8 is hermetically sealed by being pressed against the anode side of the plate structure in contact therewith. The back side of the frame 9 is hermetically connected to the cathode side of the other plate structure through a seal 10.

[0033] Specifically, the membrane electrode 8, as the core component of the PEM electrolytic cell, is composed of a proton-conducting membrane. Porous electrocatalyst layers are coated on both the anode and cathode sides of the proton-conducting membrane, and the functions include: conducting protons (H + ), blocking the passage of electrons and gases, ensuring the separation of hydrogen and oxygen during the electrolysis process; catalyzing reactions, reducing the energy threshold of water decomposition, and accelerating the reaction process, etc. At the same time, in the traditional design of the membrane electrode, the size of the membrane electrode is generally the same as that of the plate. However, during operation, only the middle reaction zone (that is, the catalyst coating area) actually plays a role. A large area at the edge of the proton membrane is designed to be the same size as the plate only for sealing and size matching considerations, which causes a significant amount of material waste, and the cost of the membrane electrode is relatively high, increasing the usage cost. In the present invention application, one side of the membrane electrode 8 is hermetically connected to the front side of the frame 9 through a seal, and the other side of the membrane electrode 8 is hermetically sealed by being pressed against the anode side of the plate structure. As described in the above plate structure, the outer dimensions of each component on the anode side of the plate structure (including the anode titanium felt 6, the anode titanium mesh 4, and the anode flow channel mesh 2) are larger than the outer dimensions of each component on the cathode side of the plate structure (including the cathode titanium felt 7, the cathode titanium mesh 5, and the cathode flow channel mesh 3). Therefore, due to the larger outer dimensions of each component on its anode side, the outer dimensions are slightly smaller than the outer dimensions of the membrane electrode 8, so that the membrane electrode 8 can be pressed and sealed to ensure the sealing effect. In the present invention application, the membrane electrode 8 can be set to a smaller area, which can not only still ensure the sealing effect, but also improve the effective utilization rate of the area of the membrane electrode 8 and reduce the material usage cost.

[0034] Optionally, the frame 9 is a plastic frame structure, and the middle part of the frame 9 is of a hollow design for reserving a space adapted to the diffusion layer of the electrode plate. In actual application, the electrolytic cell adopts the single cell of the present invention application, which includes dozens to hundreds of single cells, and the single cells are connected in series. Since the plastic frame is adopted in the present invention application, it can not only reduce the weight of the whole electrolytic cell, but also is beneficial to improving the insulation performance between the single cells.

[0035] Specifically, as Figure 8 shown in the front structure of the frame 9, two anode fluid ports 91 are respectively arranged at the upper and lower ends (Y direction in the figure) of the frame 9 close to the front surface. Any one of the two anode fluid ports 91 is an anode fluid inlet, and the other is an anode fluid outlet, which can be selected and applied according to actual needs. In the present invention application, both of the two anode fluid ports 91 adopt rectangular through-hole structures. Two cathode fluid ports 92 are respectively arranged at the left and right ends (X direction in the figure) of the frame 9 close to the front surface. Any one of the two cathode fluid ports 93 is a cathode fluid inlet, and the other is a cathode fluid outlet, which can be selected and applied according to actual needs. Both of the two cathode fluid ports 92 adopt rectangular through-hole structures.

[0036] Specifically, on the light plate 1 in the electrode plate structure, fluid ports 11 are arranged near its four peripheral edges, and the four fluid ports 11 are respectively arranged corresponding to the two anode fluid ports 91 and the two cathode fluid ports 92 on the frame 9.

[0037] Optionally, anode cross-over channels 911 are further arranged on the front surface of the frame 9, and the two anode cross-over channels 911 are respectively located between the two anode fluid ports 91 and the hollow area in the middle of the frame 9. The anode cross-over channel 911 includes a diversion groove penetrating in the vertical direction (Y direction in the figure), and a plurality of diversion grooves are arranged in parallel at intervals. Through the arrangement of the anode cross-over channel 911, the fluid on the anode side of the electrode plate structure can be evenly distributed under the action of the diversion groove. The design of this cross-over channel is not limited to the above structure, and a wavy diversion groove structure or several raised parts arranged in a staggered manner and other structures can also be adopted, and a similar effect can also be achieved.

[0038] Optionally, as Figure 9Shown is the back structure of the frame 9. Cathode cross - flow channels 921 are also provided at the left and right ends of the back of the frame 9. The two cathode cross - flow channels 921 are respectively located between the two cathode flow ports 92 and the hollow area in the middle of the frame 9. The cathode cross - flow channel 921 includes a diversion groove that penetrates along the horizontal direction (X direction in the figure). A plurality of diversion grooves are arranged in parallel at intervals. Through the setting of the cathode cross - flow channel 921, the fluid on the cathode side of the plate structure can be evenly distributed under the action of this diversion groove. The design of this cross - flow channel is not limited to the above structure, and a wavy diversion groove structure or several raised portions arranged in a staggered manner and other structures can also be used, and similar effects can be achieved.

[0039] Optionally, as Figure 7 Shown is a partially enlarged schematic diagram of the front of the frame. The front of the frame 9 is also provided with a profiling inner sunk groove 93 corresponding to the membrane electrode 8. Through the setting of the inner sunk groove 93, the membrane electrode 93 is embedded and installed inside the frame 9, avoiding problems such as dislocation and displacement of the membrane electrode 8 during assembly. At the same time, notch areas are also provided at both ends of the membrane electrode 8 and on the side in contact with the inner sunk groove 93. This notch area facilitates the assembly of the membrane electrode 8 and further ensures that the membrane electrode 8 can be accurately positioned during assembly.

[0040] Optionally, in order to further ensure the accuracy of the assembly of the membrane electrode 8 and the frame 9, positioning protrusions 931 are provided at the four corners of the inner sunk groove 93. The positioning protrusions 931 can be cylindrical, frustum - shaped, conical, etc. Positioning holes 81 are provided on the membrane electrode 8 that cooperate with the positioning protrusions 931. Through the cooperation of the positioning protrusions 931 and the positioning holes 81, the firmness of the assembly of the membrane electrode 8 can be ensured.

[0041] Optionally, as Figure 6 Shown, the seal 10 includes an inner rubber seal 101 and an outer rubber seal 102. The front of the frame 9 is hermetically connected to the membrane electrode 8 through the inner rubber seal 101. The front of the frame 9 is also hermetically connected to the anode side of a plate structure through the outer rubber seal 102. The back of the frame 9 is hermetically connected to the cathode side of another plate structure through the outer rubber seal 102. The bonding materials selected for the inner rubber seal 101 and the outer rubber seal 102 are non - conductive materials and have good electrical insulation properties. For example, sealing and bonding materials such as ethylene propylene diene monomer (EPDM) or fluororubber are used to achieve the connection. Through the setting of the inner rubber seal 101 and the outer rubber seal 102, the membrane electrode 8 and the frame 9, and the frame 9 and the plate structure are connected by bonding, ensuring the sealing effect of the single cell and preventing the risk of seal failure.

[0042] Specifically, as Figure 7As can be seen from the enlarged schematic view of the partial structure of the front side of the shown frame, an inner rubber sealing groove 94 is provided at the bottom periphery of the front side of the frame 9 corresponding to the inner sunken groove 93. The inner rubber sealing groove 94 corresponds to the inner rubber sealing member 101. By injecting a sealing adhesive material into the inner rubber sealing groove 94 to form the inner rubber sealing member 101, a two-way bonding between the front side of the frame 9 and the membrane electrode 8 is achieved, so that the front side of the frame 9 is bonded to one side surface of the membrane electrode 8.

[0043] Specifically, as Figure 8 shown in the front side structure of the frame 9, an anode-side outer rubber sealing groove 96 is provided on the front side of the frame 9. By injecting a sealing adhesive material into the anode-side outer rubber sealing groove 96 to form an outer rubber sealing member 102, the outer rubber sealing member 102 is located at the outer edge of the front side of the frame 9 and seals the corresponding anode reaction area, preventing the liquid in the anode reaction area from leaking. A cathode-side outer rubber sealing groove 95 is provided on the back side of the frame 9. By injecting a sealing adhesive material into the cathode-side outer rubber sealing groove 95 to form an outer rubber sealing member 102, the outer rubber sealing member 102 is located at the outer edge of the back side of the frame 9 and seals the corresponding cathode reaction area, preventing the liquid in the cathode reaction area from leaking out.

[0044] Specifically, as Figure 4 、 5 shown in the cross-sectional view of the single cell of

[0045] 、

[0046] Taking the cathode reaction area corresponding to the back side of the frame 9 as an example for detailed description, the fluid enters from the cathode fluid inlet 92, is evenly distributed through the cathode cross-flow channel 921 of the frame 9 connected thereto, and then enters the cathode titanium felt 7 for reaction. The reaction products are collected through the cathode cross-flow channel 921 on the other side and flow out from another cathode fluid outlet 93. The working principle of the anode reaction area on the front side of the frame 9 is similar to that of the above-mentioned cathode reaction area and will not be elaborated here. Since the membrane electrode 8 is hermetically connected to the front side of the frame 9 through the inner sealing member 101, and the front side and the back side of the frame 9 are respectively hermetically connected to the two plate structures through the outer rubber sealing member 102, the cathode reaction area on the front side of the frame 9 and the anode reaction area on the back side of the frame 9 form two independent reaction chambers.

[0045] Optionally, assembly positioning holes 97 are provided at the edges near the corners of the frame 9. Positioning through holes matching the assembly positioning holes 97 are provided on the light plate 1 of the plate structure. After the frame 9 is assembled by corresponding the assembly positioning holes 97 with the positioning through holes of the plate structure, the positioning is ensured to be accurate, the installation accuracy during the integrated assembly of the single cell is improved, and the installation efficiency is also improved.

[0046] The single cell provided by the embodiment of the present invention application has the following advantages: 1. The plate with an integrated structure is adopted, which can reduce the thickness of the light plate substrate, save the material usage cost. At the same time, no flow channels are provided on the side of the plate, eliminating the etching process and reducing the complexity of processing and manufacturing; 2. At the same time, the integrated structure of the plate eliminates the electroplating process and uses PVD coating on the surface, which reduces the number of coatings and greatly increases the cost reduction space; 3. The one-piece plate integrates seven important components into one, which simplifies the subsequent assembly process. At the same time, it is thinner and lighter, has higher mechanical strength, and is more suitable for the current development trend of electrolytic cells towards larger plates and larger currents. At the same time, it reduces the contact resistance between the components, which is conducive to improving the overall performance. 4. The membrane electrode 8 is sealed and connected to the anode side of the plate structure through the frame 9, which not only ensures the effectiveness of the sealed connection, but also improves the effective utilization rate of the area of ​​the membrane electrode 8 and reduces the material cost; 5. The introduction of a plastic frame structure is beneficial to improving the insulation performance between each cell, while also ensuring assembly precision and accuracy.

[0047] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

[0048] As mentioned above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A PEM electrolytic cell plate structure, comprising a plain plate, a cathode flow channel network, a cathode titanium felt, an anode flow channel network, and an anode titanium felt, characterized in that, The light plate has two opposite sides. On one side of the light plate, the cathode flow channel network and the cathode titanium felt are sequentially arranged from inside to outside. On the other side of the light plate, the anode flow channel network and the anode titanium felt are sequentially arranged from inside to outside. And the cathode titanium felt, the cathode flow channel network, the light plate, the anode flow channel network, and the anode titanium felt form an integral structure.

2. The PEM electrolytic cell plate structure according to claim 1, characterized in that, A cathode titanium mesh is further provided between the cathode flow channel network and the cathode titanium felt, and / or an anode titanium mesh is further provided between the anode flow channel network and the anode titanium felt. The cathode titanium felt, the cathode titanium mesh, the cathode flow channel network, the light plate, the anode flow channel network, the anode titanium mesh, and the anode titanium felt are sequentially arranged and form an integral structure.

3. A PEM electrolyzer plate structure according to claim 2, characterized in that, The flow channel directions of the anode flow channel network and the cathode flow channel network are perpendicular to each other.

4. The PEM electrolytic cell plate structure according to claim 3, characterized in that, Both the anode flow channel network and the cathode flow channel network are made by stamping.

5. The PEM electrolytic cell plate structure according to claim 4, wherein, The anode titanium felt, the anode titanium mesh, and the anode flow channel network have the same outer dimensions. The cathode titanium felt, the cathode titanium mesh, and the cathode flow channel network have the same outer dimensions. The outer dimensions of the anode titanium felt are larger than those of the cathode titanium felt.

6. A single cell, characterized in that, It includes a PEM electrolytic cell plate structure according to any one of the above claims 1-5.

7. The single cell according to claim 6, wherein The single cell further includes a membrane electrode and a frame. There are two of the plate structures. The front of the frame is sequentially and sealingly connected to the membrane electrode and the anode side of one of the plate structures. One side of the membrane electrode is sealingly connected to the front of the frame through a seal. The other side of the membrane electrode is tightly sealed by the plate structure in contact with it. The back of the frame is sealingly connected to the cathode side of the other plate structure through the seal.

8. The single cell according to claim 7, wherein, The frame is a plastic frame structure.

9. The single cell according to claim 7, characterized in that, The seal includes an inner rubber seal and an outer rubber seal. One side of the membrane electrode is sealingly connected to the front of the frame through the inner rubber seal. The front of the frame is also sealingly connected to one of the plate structures through the outer rubber seal. The back of the frame is sealingly connected to the cathode side of the other plate structure through the outer rubber seal.

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