Pole frame assembly, bipolar plate assembly and electrolytic bath

Abstract

The utility model relates to a pole frame assembly, a bipolar plate assembly and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production. The pole frame assembly comprises an annular pole plate outer frame; the first channel piece is arranged on the edge of the inner side of the annular polar plate outer frame and forms a first air outlet channel and a second air outlet channel; the second channel piece is arranged on the edge of the inner side of the annular polar plate outer frame and forms a liquid inlet channel; wherein the edge of the first channel piece and / or the edge of the second channel piece are / is provided with a first installation part formed by sinking in the thickness direction of the annular polar plate outer frame, the edge of the inner side of the annular polar plate outer frame is provided with a third installation part formed by sinking in the thickness direction of the annular polar plate outer frame, and the third installation part and the first installation part are communicated and located on the same plane. According to the electrode frame assembly, the bipolar plate assembly and the electrolytic bath, the machining procedures of the electrode plate outer frame can be reduced, it is effectively ensured that interpenetration does not occur between the anode chamber and the cathode chamber, and it is avoided that the outlet gas purity and production safety are affected.

Description

Technical Field

[0001] This application relates to the field of water electrolysis for hydrogen production technology, and in particular to an electrode frame assembly, a bipolar plate assembly, and an electrolyzer. Background Technology

[0002] In the field of alkaline water electrolysis for hydrogen production, pressure filtration bipolar electrolyzers are commonly used. These electrolyzers consist of several stacked bipolar plate assemblies. Each bipolar plate assembly includes an electrode frame and bipolar plates disposed within the frame. Adjacent bipolar plate assemblies are separated into anode and cathode chambers by diaphragms and electrically insulated and sealed by gaskets.

[0003] Currently, electrolyzers typically have liquid inlet channels and gas outlet channels dispersed around the outer periphery of the annular electrode frame, connecting the anode and cathode chambers. This results in more processing steps for the electrode frame and an increase in its width, thus increasing the material usage. Furthermore, because the outer frame has liquid inlet and gas outlet channels, the sealing gaskets thereon have a smaller stress area and uneven stress distribution. This necessitates applying different pre-tightening forces in different areas during cell tightening, complicating the tightening process. Additionally, during operation, pressure fluctuations in the electrolysis equipment increase the risk of deformation and failure of the sealing gaskets in these areas due to the large stress fluctuations. This increases the risk of cross-contamination between the liquid inlet and gas outlet channels, posing a safety hazard to the hydrogen production process. Utility Model Content

[0004] This application provides an electrode frame assembly, a bipolar plate assembly, and an electrolytic cell to solve technical problems such as the complex processing steps of existing electrode frames and the mutual penetration between the liquid inlet channel and the gas outlet channel of the electrolytic cell.

[0005] To address the aforementioned issues, embodiments of this application provide an electrode frame assembly, comprising: an annular electrode plate outer frame; a first channel member disposed on the inner edge of the annular electrode plate outer frame and forming a first air outlet channel and a second air outlet channel; and a second channel member disposed on the inner edge of the annular electrode plate outer frame and forming a liquid inlet channel; wherein, the edges of the first channel member and / or the second channel member are provided with a first mounting portion recessed along the thickness direction of the annular electrode plate outer frame, and the inner edge of the annular electrode plate outer frame is provided with a third mounting portion recessed along the thickness direction of the annular electrode plate outer frame, the third mounting portion communicating with the first mounting portion and located on the same plane. Therefore, on the one hand, by separately setting up the first and second channel components for forming the gas outlet and liquid inlet channels, the outer frame of the annular electrode plate does not need to undergo complex processing steps, which helps to reduce the processing time of the annular electrode plate outer frame, improve efficiency, and simplify the clamping process, thereby improving the resistance of the sealing gasket under pressure fluctuation conditions. On the other hand, the first mounting part is provided on the first and / or second channel components. When multiple electrode frame assemblies are stacked to form an electrolytic cell, the diaphragm or electrode mesh is placed at the first and third mounting parts, and external force is applied to press the adjacent electrode frame assemblies together. This allows the diaphragm to fit tightly against the inner walls of the first and third mounting parts, which is convenient for assembly and has good gas barrier properties. This ensures that there is no gas interpenetration between the anode chamber and the cathode chamber separated by the diaphragm, avoiding affecting the purity of the gas outlet and production safety. At the same time, the first and third mounting parts are located on the same plane, which allows the diaphragm or electrode mesh to be installed on a horizontal plane, which helps to further improve the sealing performance of the electrolytic cell.

[0006] Based on the above embodiments, optionally, the first channel member and / or the second channel member are further provided with a second mounting portion recessed from the surface of the first mounting portion along the thickness direction of the annular electrode outer frame. The second mounting portion is connected to the first mounting portion in a stepped manner. The inner edge of the annular electrode outer frame is provided with a fourth mounting portion recessed from the surface of the third mounting portion along the thickness direction of the annular electrode outer frame. The fourth mounting portion communicates with the second mounting portion and is located on the same plane. Thus, when multiple electrode frame assemblies are stacked to form an electrolytic cell, placing the diaphragm at the first and third mounting portions and placing the electrode mesh at the second and fourth mounting portions and then pressing them together will ensure that the diaphragm and the electrode mesh are in close contact, thereby reducing the gap between adjacent electrode frame assemblies, reducing ohmic resistance, and improving the energy efficiency of the electrolytic cell.

[0007] Based on any of the above embodiments, optionally, at least one of the first mounting portion, the second mounting portion, the third mounting portion, and the fourth mounting portion has a width in the direction of the annular surface of the parallel annular electrode frame that is 10%-50% of the width of the annular electrode frame. In this case, any one of the first mounting portion, the second mounting portion, the third mounting portion, and the fourth mounting portion has a sufficient area to receive the diaphragm or electrode mesh, which can increase the clamping force during the assembly of the annular electrode frame, the diaphragm, or the electrode mesh, thereby improving the sealing performance of the electrolytic cell.

[0008] Based on any of the above embodiments, optionally, the annular electrode frame is circular, and the width of the annular electrode frame is 2%-10% of the inner diameter of the annular electrode frame. In this case, the circular annular electrode frame makes the electrolytic cell circular. The circular annular electrode frame can not only avoid the formation of gas trapping dead zones in the circular electrolytic cell, making the flow field and temperature in the electrolysis area more uniform, but also ensure that the annular electrode frame has sufficient contact surface, without affecting the assembly relationship between the annular electrode frame and various components. It can also reduce the material used for the annular electrode frame and reduce the overall weight of the electrolytic cell.

[0009] Based on any of the above embodiments, optionally, the annular electrode frame has a first side and a second side opposite to each other in the thickness direction; the side of the first channel member near the first side is provided with a first mounting portion and a second mounting portion in sequence, and the side of the first channel member near the second side is provided with a second mounting portion; and / or the side of the second channel member near the first side is provided with a first mounting portion and a second mounting portion in sequence, and the side of the second channel member near the second side is provided with a second mounting portion. When multiple electrode frame assemblies are used to assemble an electrolytic cell, since the cathode chamber and anode chamber formed between adjacent electrode frame assemblies only need to be separated by a diaphragm, in this embodiment, it is sufficient to provide a first mounting portion only on one side of the first channel member and / or the second channel member.

[0010] Based on any of the above embodiments, optionally, the first channel component includes: a first transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame, the first transverse partition and the annular electrode outer frame together forming an air outlet chamber; and a first longitudinal partition, the two ends of which are respectively connected to the annular electrode outer frame and the first transverse partition, so as to divide the air outlet chamber into a first air outlet channel and a second air outlet channel; by connecting the first transverse partition and the first longitudinal partition to the annular electrode outer frame, the first air outlet channel and the second air outlet channel can be separated, which is convenient and efficient to assemble; and / or,

[0011] The second channel component includes: a second transverse partition, both ends of which are connected to the inner edges of the annular electrode frame, forming a liquid inlet chamber together with the annular electrode frame; and a second longitudinal partition, both ends of which are connected to the annular electrode frame and the second transverse partition, thereby dividing the liquid inlet chamber into at least two liquid inlet channels. By connecting the second transverse and second longitudinal partitions to the annular electrode frame, at least one liquid inlet channel can be formed, making the assembly of the second channel component with the annular electrode frame convenient and efficient.

[0012] Optionally, based on any of the above embodiments, the edges of the first and second diaphragms are provided with first mounting portions. This allows for convenient installation of the diaphragm or electrode mesh at the first mounting portions on the edges of the first and second diaphragms, and the presence of the first mounting portions at the edges does not affect the opening of air vents and liquid inlets in the first and second diaphragms.

[0013] Based on any of the above embodiments, optionally, the first diaphragm is provided with a first vent hole communicating with the first vent channel and a second vent hole communicating with the second vent channel; and / or, the second diaphragm is provided with a liquid inlet hole communicating with the liquid inlet channel. Through the arrangement of the first vent hole, the second vent hole, and the liquid inlet hole, the gas produced in the cathode chamber and the anode chamber is discharged to the first vent channel and the second vent channel, and the external electrolyte input through the liquid inlet channel is introduced into the cathode chamber and the anode chamber.

[0014] Based on any of the above embodiments, optionally, the number of first vent holes and second vent holes is at least one, the inlets of all first vent holes and second vent holes are on the same straight line, and the outlets are all on another straight line; and / or, the number of liquid inlets is at least one, the inlets of all liquid inlets are on the same straight line, and the outlets are all on another straight line. Thus, in the operating state of the pole frame assembly, the first vent holes and second vent holes are located at substantially equal heights, avoiding pressure differences between the first vent channel and the second vent channel or between multiple liquid inlet channels, which is beneficial to the uniformity of exhaust and liquid inlet.

[0015] Optionally, based on any of the above embodiments, the first channel component further includes: a first connecting plate, one side of which is matched and connected to the inner side of the annular electrode outer frame, and the other side is connected to the first transverse partition and the first longitudinal partition. The first connecting plate, the first transverse partition, and the first longitudinal partition together form a first air outlet channel and a second air outlet channel. In this embodiment, the first air outlet channel and the second air outlet channel are formed by the first transverse partition, the first longitudinal partition, and the first connecting plate, without relying on the annular electrode outer frame, which further reduces the processing requirements of the annular electrode outer frame. Furthermore, the first transverse partition and the first longitudinal partition are connected to the annular electrode outer frame through the first connecting plate, which helps to improve the connection strength between the first channel component and the annular electrode outer frame. And / or,

[0016] The second channel component further includes a second connecting plate, one side of which is matched and connected to the inner side of the annular electrode frame, and the other side is connected to the second transverse partition and the second longitudinal partition, together forming a liquid inlet channel. In this embodiment, the liquid inlet channel is formed by the second transverse partition, the second longitudinal partition, and the second connecting plate, without relying on the annular electrode frame, which further reduces the processing requirements of the annular electrode frame and improves the connection strength between the second channel component and the annular electrode frame.

[0017] According to another embodiment of this application, an electrode frame assembly is provided, including: an annular electrode plate outer frame; a first channel member disposed on the inner edge of the annular electrode plate outer frame and forming a first gas outlet channel and a second gas outlet channel; and a second channel member disposed on the inner edge of the annular electrode plate outer frame and forming a liquid inlet channel; the annular electrode plate outer frame, the first channel member, and the second channel member enclose an electrolysis region, wherein the orthographic projection area of ​​the first gas outlet channel or the second gas outlet channel in the thickness direction of the annular electrode plate outer frame is 0.05%-3% of the orthographic projection area of ​​the electrolysis region in the thickness direction; and / or the orthographic projection area of ​​the liquid inlet channel in the thickness direction of the annular electrode plate outer frame is 0.05%-3% of the orthographic projection area of ​​the electrolysis region in the thickness direction. Thus, the orthographic projection areas of the first gas outlet channel, the second gas outlet channel, or the liquid inlet channel are within a suitable range in this embodiment, which neither significantly reduces the effective electrolysis area, ensuring good circulation of the electrolyte, nor hinders uniform and stable liquid inlet and gas outlet.

[0018] Based on the above embodiments, optionally, the sum of the orthogonal projected areas of the first and second air outlet channels in the thickness direction is greater than the orthogonal projected area of ​​the liquid inlet channel in the thickness direction, so as to maximize the volume of the first and second air outlet channels and facilitate gas discharge.

[0019] Based on any of the above embodiments, optionally, the first channel component includes: a first transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame, the first transverse partition and the annular electrode outer frame together forming an outlet chamber; and a first longitudinal partition, the two ends of which are respectively connected to the annular electrode outer frame and the first transverse partition, to divide the outlet chamber into a first outlet channel and a second outlet channel; and / or,

[0020] The second channel component includes: a second transverse partition, the two ends of which are respectively connected to the inner edge of the outer frame of the annular electrode plate, and the second transverse partition and the outer frame of the annular electrode plate together form a liquid inlet chamber; and a second longitudinal partition, the two ends of which are respectively connected to the outer frame of the annular electrode plate and the second transverse partition, so as to divide the liquid inlet chamber into at least two liquid inlet channels.

[0021] Based on any of the above embodiments, optionally, the outer frame of the annular electrode plate is circular, and the length of the first and / or second transverse partition is 10%-50% of the inner diameter of the outer frame of the annular electrode plate. The length of the first or second transverse partition is within a suitable range in this embodiment, which ensures that the electrolytic region enclosed between the first transverse partition, the outer frame of the annular electrode plate, and the second channel component is not too small, thus ensuring good circulation of the electrolyte, while also improving the current density of the electrolytic region and reducing energy consumption.

[0022] Based on any of the above embodiments, optionally, the outer frame of the annular electrode plate is circular, and the length of the first longitudinal partition and / or the second longitudinal partition is 1%-5% of the inner diameter of the outer frame of the annular electrode plate. By controlling the lengths of the first longitudinal partition and / or the second longitudinal partition within a suitable range, it is beneficial to further improve the circulation efficiency of the electrolyte and the gas emission rate, thereby increasing the current density in the electrolysis region.

[0023] According to another embodiment of this application, a bipolar plate assembly is provided, comprising: an electrode frame assembly, a bipolar plate, and a diaphragm as described in any of the above embodiments; the bipolar plate is connected to an annular electrode frame, a first channel member, and a second channel member; the diaphragm is installed on one side of the electrode frame assembly along its thickness direction. Based on the structural design of the electrode frame assembly, the processing steps of the bipolar plate assembly can be reduced, the automation level of electrolytic cell assembly can be improved, assembly efficiency can be increased, and assembly costs can be reduced. Furthermore, the sealing performance of the electrolytic cell can be improved, effectively ensuring that there is no mutual permeation between the anode chamber and the cathode chamber, thus avoiding affecting the purity of the emitted gas and production safety.

[0024] Based on the above embodiments, optionally, the electrode frame assembly is the electrode frame assembly according to the above embodiments, and the diaphragm is mounted on the first mounting part of the first channel member and / or the second channel member and the third mounting part of the annular electrode plate outer frame.

[0025] Optionally, based on any of the above embodiments, the bipolar plate assembly further includes a sealing structure that at least partially covers the diaphragm, the first channel member, the second channel member, and the annular plate outer frame, thereby integrally connecting the diaphragm with the first channel member, the second channel member, and the annular plate outer frame. The sealing structure improves the stability of the connection between the diaphragm, the first channel member, the second channel member, and the annular plate outer frame, enhances the sealing performance after assembly, and eliminates the need for a sealing gasket, simplifying the assembly process.

[0026] Optionally, based on any of the above embodiments, the bipolar plate assembly further includes an electrode mesh, which is connected to the annular electrode frame, the first channel member, and the second channel member and is located between the bipolar plate and the diaphragm.

[0027] The connection is robust. According to another embodiment of this application, an electrolytic cell is provided, including a plurality of stacked bipolar plate assemblies as described in any of the above embodiments.

[0028] In summary, the electrode frame assembly, bipolar plate assembly, and electrolytic cell provided in this application have at least the following beneficial effects:

[0029] The electrolytic cell provided in this application includes a bipolar plate assembly, which includes an electrode frame assembly. The electrode frame assembly includes an annular electrode frame, a first channel component, and a second channel component. The first channel component is provided with a first gas outlet channel and a second gas outlet channel, and the second channel component is provided with a liquid inlet channel. Therefore, it is not necessary to provide a gas outlet channel and a liquid inlet channel in the annular electrode frame, thereby reducing the processing steps of the annular electrode frame and reducing the width and material usage of the annular electrode frame. Furthermore, since the first channel component and / or the second channel component are provided with a first mounting portion recessed along the thickness direction of the annular electrode plate outer frame, and the annular electrode plate outer frame is provided with a third mounting portion recessed along the thickness direction of the annular electrode plate outer frame, which can be used to install other components in the electrolytic cell, such as diaphragms and electrode grids, when multiple electrode frame assemblies are used to assemble an electrolytic cell, the adjacent electrode frame assemblies can be pressed against each other to make the diaphragm or electrode grid tightly adhere to the inner walls of the first mounting portion and the third mounting portion, so that the diaphragm or electrode grid is tightly fitted with the first channel component and / or the second channel component. This allows for easy stacking to obtain an electrolytic cell, improves the automation level of electrolytic cell assembly, and does not damage the diaphragm or electrode grid, allowing for the recycling and reuse of the diaphragm or electrode grid. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the first side of the polar frame assembly provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the second side of the polar frame assembly provided in an embodiment of this application;

[0033] Figure 3 for Figure 1 Enlarged view of section D;

[0034] Figure 4 A schematic diagram of the structure of the first channel component of the polar frame assembly provided in the embodiments of this application;

[0035] Figure 5 A schematic diagram of the structure of the first channel member of the polar frame assembly provided in another embodiment of this application;

[0036] Figure 6 A schematic diagram of the structure of the second channel component of the polar frame assembly provided in the embodiments of this application;

[0037] Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA surface;

[0038] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure of the middle BB surface;

[0039] Figure 9 for Figure 4 Schematic diagram of the cross-sectional structure of the C-plane;

[0040] Figure 10 This is a schematic diagram of the structure of the bipolar plate assembly provided in an embodiment of this application.

[0041] The attached figures are labeled as follows:

[0042] 10. Bipolar plate assembly;

[0043] 100. Frame assembly;

[0044] 110. Annular electrode plate outer frame; 111. First side; 112. Second side; 113. First positioning part;

[0045] 120. First channel component; 121. First air outlet channel; 122. Second air outlet channel; 123. First transverse partition; 123a. First air outlet; 123b. Second air outlet; 123c. Second positioning part; 124. First longitudinal partition; 125. First connecting plate;

[0046] 130. Second channel component; 131. Liquid inlet channel; 132. Second transverse partition; 132a. Liquid inlet hole; 133. Second longitudinal partition; 134. Second connecting plate;

[0047] 140. First Installation Department;

[0048] 150. Second Installation Department;

[0049] 160. Third Installation Department;

[0050] 170. Fourth Installation Department;

[0051] 200. Bipolar plate;

[0052] 300. Diaphragm;

[0053] 400, Extreme Network;

[0054] 500, Supporting network. Detailed Implementation

[0055] In the description of this application, it should be understood that the use of terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" to indicate orientation or positional relationship, unless otherwise specified, is understood to be based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] Furthermore, features specified with "first" or "second" for descriptive purposes only should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features specified with "first" or "second" may explicitly or implicitly include at least one of the specified features. The description of "multiple" generally means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Please refer to Figures 1 to 9 The electrode frame assembly 100 provided in this application embodiment includes an annular electrode outer frame 110, a first channel member 120, and a second channel member 130. The first channel member 120 is disposed on the inner edge of the annular electrode outer frame 110 and forms a first gas outlet channel 121 and a second gas outlet channel 122; the second channel member 130 is disposed on the inner edge of the annular electrode outer frame 110 and forms a liquid inlet channel 131; the area enclosed between the electrode outer frame 110, the first channel member 120, and the second channel member 130 is used to place the electrode plate, and the area where the electrode plate surface is located forms the electrolysis area. The liquid inlet channel 131 is used to feed the electrolysis raw material liquid, such as alkali solution, into the electrolysis area, and the first gas outlet channel 121 and the second gas outlet channel 122 are used to discharge the hydrogen and oxygen generated by the electrolysis of water, respectively. The first channel component 120 and / or the second channel component 130 are provided with a first mounting portion 140 recessed along the thickness direction of the annular electrode outer frame 110 at their edges. The inner edge of the annular electrode outer frame 110 is provided with a third mounting portion 160 recessed along the thickness direction of the annular electrode outer frame 110. The third mounting portion 160 communicates with the first mounting portion 140 and is located on the same plane. The first mounting portion 140 and the third mounting portion 160 can be used to install other components in the electrolytic cell, such as the diaphragm 300, the electrode grid 400, etc. For example, in some embodiments, the first mounting portion 140 may be provided only in the first channel member 120. In this case, one side of the diaphragm 300 or the electrode mesh 400 is mounted to the first channel member 120 through the first mounting portion 140, and the other side of the diaphragm 300 or the electrode mesh 400 is connected to the second channel member 130 by means of bonding or the like. Similarly, in other embodiments, the first mounting portion 140 may be provided only in the second channel member 130. Or, in other embodiments, the first mounting portion 140 may be provided in both the first channel member 120 and the second channel member 130.

[0060] Through the above structural design, on the one hand, since the first channel component 120 and the second channel component 130 are separately set to form the gas outlet channel and the liquid inlet channel 131, the annular electrode frame 110 does not need to undergo complex processing steps, which helps to reduce the processing time of the annular electrode frame 110, improve efficiency, and reduce the width and material usage of the annular electrode frame 110. At the same time, it can also simplify the tight groove process and improve the resistance of the sealing gasket under pressure fluctuation conditions. On the other hand, the first channel component 120 and / or the second channel component 130 are provided with a first mounting part 140. When multiple electrode frame assemblies 100 are used to stack to form an electrolytic cell, the diaphragm 300 or electrode... The mesh 400 is positioned at the first mounting portion 140 and the third mounting portion 160, which are recessed relative to the thickness direction of the outer frame 110 of the annular electrode plate. External force is applied to press the adjacent electrode frame assemblies 100 together, thereby ensuring a tight fit between the diaphragm 300 or the mesh 400 and the inner walls of the first mounting portion 140 and the third mounting portion 160. This presses the diaphragm 300 or the mesh 400 between the adjacent electrode frame assemblies 100, allowing for easy assembly of the electrolytic cell. This eliminates the need for bolt tightening during assembly, increasing the automation level of the electrolytic cell assembly, reducing the equipment required for bolt tightening, improving assembly efficiency, and lowering assembly costs. Furthermore, by providing the first mounting portion 140 and the third mounting portion 160 on the same plane, the diaphragm 300 or the mesh 400 can be mounted on a horizontal plane, resulting in uniform stress on the sealing gaskets in all areas and improving the sealing performance of the electrolytic cell. In one optional embodiment, the outer frame of the annular electrode plate in the electrode frame assembly is circular, for installation in a circular electrolyzer. In existing circular electrolyzers, because all gas outlet channels are located on the annular electrode plate outer frame, and multiple channels are at different heights, a gas-trapping dead zone exists in the upper part of the electrolyzer, and the media in each gas outlet channel interfere with each other, resulting in uneven flow and temperature fields in the electrolysis region, affecting the efficiency of hydrogen production by electrolysis. By adopting the electrode frame assembly of this embodiment, all gas outlet channels are located on the first channel component, which avoids the formation of gas-trapping dead zones in the circular electrolyzer, making the flow and temperature fields in the electrolysis region more uniform, thereby improving the efficiency of hydrogen production by electrolysis.

[0061] In one optional embodiment, the outer frame of the annular electrode plate in the electrode frame assembly is circular, and it is used to install in an electrolyzer with a circular outer contour. In existing circular electrolyzers using electrode frame assemblies, all gas outlet channels are located on the annular electrode plate outer frame, with multiple channels at different heights. This results in a trapped gas dead zone at the top of the electrolyzer, and the media in each gas outlet channel interfere with each other, leading to uneven flow and temperature fields in the electrolysis region, thus affecting the efficiency of hydrogen production through electrolysis. By using the electrode frame assembly of this embodiment, all gas outlet channels are located on the first channel component, which avoids the formation of trapped gas dead zones in the circular electrolyzer, making the flow and temperature fields in the electrolysis region more uniform, thereby improving the efficiency of hydrogen production through electrolysis.

[0062] It should be noted that, for ease of understanding of the technical solution of this application, the annular electrode outer frame 110 is described in the following text as an example of a circular frame. Of course, the shape of the annular electrode outer frame 110 is not limited to a circular frame; for example, the annular electrode outer frame 110 can also be a rectangular frame, a pentagonal frame, or other shapes.

[0063] It should also be noted that in this article, the X-direction can be understood as... Figures 1 to 9 From a visual perspective, the horizontal direction, Y-axis is perpendicular to X-axis. The Y-axis can be understood as... Figures 1 to 9 The horizontal direction from the perspective of the annular electrode outer frame 110 is the thickness direction. The Z-axis is perpendicular to the X and Y axes. The Z-axis can be understood as... Figures 1 to 9 The vertical direction from the perspective of gravity is the direction of gravity.

[0064] In some embodiments, the first channel member 120 and the second channel member 130 are disposed along the circumference of the annular electrode outer frame 110 on the inner edge of the annular electrode outer frame 110, and the first channel member 120 and the second channel member 130 are disposed opposite each other at the top and bottom ends of the annular electrode outer frame 110 in the Z direction. The edges of the first channel member 120 and the second channel member 130 are provided with a first mounting portion 140, and the annular electrode outer frame 110 is provided with a third mounting portion 160 recessed along the thickness direction. The first mounting portion 140 and the third mounting portion 160 are connected and located on the same plane to facilitate the installation of the diaphragm 300.

[0065] Because a third mounting part 160 is provided on the inner edge of the annular electrode plate outer frame 110, and a first mounting part 140 is provided on the edge of the first channel member 120 and the edge of the second channel member 130, the first mounting part 140 and the third mounting part 160 can limit the installation of the diaphragm 300. During installation, the diaphragm 300 can be fixed by clamping force, which reduces the processing steps and costs. As a result, the electrolytic cell can be easily assembled, and the integrity of the diaphragm 300 is maintained. This is beneficial for the diaphragm 300 to be directly used after recycling, thereby improving the utilization rate of the diaphragm 300. Furthermore, by setting the first mounting portion 140 and the third mounting portion 160 located on the same horizontal plane, the sealing of the connection between the diaphragm 300 and the outer frame 110 of the electrode plate, the first channel member 120 and the second channel member 130 can be ensured, effectively preventing the gas in the first gas outlet channel 121 and the second gas outlet channel 122 from mutually penetrating through the gap between the first channel member 120 and the diaphragm 300, so as to improve the gas purity and avoid the safety risk of explosion caused by the mutual penetration of hydrogen and oxygen.

[0066] Meanwhile, since there is no need to provide liquid and gas channels on the annular electrode outer frame 110, the radial width of the annular electrode outer frame 110 can be reduced, thereby reducing the material required to manufacture the annular electrode outer frame 110, reducing processing costs, and shortening processing time.

[0067] As a further preferred embodiment, based on the above-mentioned solution, the specific embodiments of this application may also include one or more of the following additions or combinations.

[0068] In some alternative embodiments, refer to Figure 1 As shown, the first channel member 120 and / or the second channel member 130 are further provided with a second mounting portion 150 recessed from the surface of the first mounting portion 140 along the thickness direction of the annular electrode outer frame 110. The second mounting portion 150 is connected to the first mounting portion 140 in a stepped manner. The second mounting portion 150 and the first mounting portion 140 are sequentially arranged in the direction from the center to the circumference. The inner edge of the annular electrode outer frame 110 is provided with a fourth mounting portion 170 recessed from the surface of the third mounting portion 160 along the thickness direction of the annular electrode outer frame 110. The fourth mounting portion 170 and the third mounting portion 160 are sequentially arranged in the direction from the center to the circumference. The fourth mounting portion 170 communicates with the second mounting portion 150 and is located on the same plane. The second mounting portion 150 and the fourth mounting portion 170 are used to mount the electrode mesh 400. Wherein, when the second mounting portion 150 is connected to the first mounting portion 140 in a stepped manner, the dimension of the second mounting portion 150 in the thickness direction of the annular electrode outer frame 110 is smaller than the dimension of the first mounting portion 140 in the thickness direction of the annular electrode outer frame 110. Specifically, refer to Figures 7 to 9 As shown, at this time, the depth of the second mounting part 150 in the Y direction is less than the depth of the first mounting part 140 in the Y direction.

[0069] Therefore, when multiple electrode frame assemblies 100 are used to assemble an electrolytic cell, the electrode mesh 400 and the diaphragm 300 are sequentially stacked on the second mounting portion 150 and the first mounting portion 140, which are connected in a stepped manner, and then pressed together. This ensures that the diaphragm 300 and the electrode mesh 400 are in close contact. This prevents the diaphragm 300 and / or the electrode mesh 400 from protruding above the outer surface of the annular electrode plate frame 110 in the thickness direction after installation in the electrode frame assembly 100, thus avoiding raised steps. This would cause uneven stress on the sealing gaskets in different areas, affecting the sealing performance of the electrolytic cell. At the same time, it helps to reduce the gap between adjacent electrode frame assemblies 100, thereby reducing ohmic resistance and improving the energy efficiency of the electrolytic cell.

[0070] It is understood that in other alternative embodiments, after the electrode mesh 400 is placed on the second mounting part 150 and the fourth mounting part 170, it can also be fixed to the inner edge of the first channel member 120, the second channel member 130 and the annular electrode plate outer frame 110 by means of welding, screw fixing, bonding or other methods.

[0071] In some optional embodiments, the surfaces of the first mounting portion 140 and the second mounting portion 150 are closed surfaces. In this embodiment, the surfaces of the first mounting portion 140 and the second mounting portion 150 are not perforated and are continuous closed surfaces. Compared to perforating the surfaces of the first mounting portion 140 and the second mounting portion 150 for bolt connection, this embodiment avoids the risk of cross-penetration between the anode and cathode chambers caused by perforation, and also does not damage the diaphragm, which is beneficial for diaphragm recycling and reuse.

[0072] In some optional embodiments, at least one of the first mounting portion 140, the second mounting portion 150, the third mounting portion 160, and the fourth mounting portion 170 has a width in the direction of the annular surface of the parallel annular electrode frame 110 that is 10%-50% of the width of the annular electrode frame 110, for example, any value between 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, or 10%-50%. Specifically, the width referred to herein refers to the radial width, see reference... Figure 3 The diagram shows the width d of the annular electrode frame 110, the width d1 of the first mounting portion 140, the width d2 of the second mounting portion 150, the width d3 of the third mounting portion 160, and the width d4 of the fourth mounting portion 170. Within this width range, any one of the first mounting portion 140, the second mounting portion 150, the third mounting portion 160, and the fourth mounting portion 170 has sufficient area to receive the diaphragm 300 or the electrode mesh 400, which can increase the clamping force of the sealing gasket on the diaphragm 300 or the electrode mesh 400 and improve the sealing performance of the electrolytic cell. In some alternative embodiments, the surfaces of the first mounting portion 140, the second mounting portion 150, the third mounting portion 160, and the fourth mounting portion 170 can be simple planes, or grooves can be provided on the planes to provide accommodating space for the diaphragm 300 or the electrode mesh 400, thereby strengthening the sealing and fixing degree of the sealing gasket on the diaphragm 300 or the electrode mesh 400.

[0073] In some optional embodiments, the width of the annular electrode outer frame 110 is 2%-10% of the inner diameter of the annular electrode outer frame 110, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or any value between 2% and 10%. Since the annular electrode outer frame 110 no longer has an exhaust channel and a liquid inlet channel 131, the width of the annular electrode outer frame 110 can be reduced. Within this width range, it is possible not only to ensure that the annular electrode outer frame 110 and the sealing gasket have sufficient contact surface, without affecting the fixing and sealing effect of the sealing gasket on the various components, but also to reduce the material used in the annular electrode outer frame 110 and reduce the overall weight of the electrolytic cell.

[0074] In some optional embodiments, the annular electrode frame 110 has a first side 111 and a second side 112 opposite to each other in the thickness direction; the first channel member 120 has a first mounting portion 140 and a second mounting portion 150 sequentially provided on the side near the first side 111, and the second mounting portion 150 is provided on the side near the second side 112; and / or the second channel member 130 has a first mounting portion 140 and a second mounting portion 150 sequentially provided on the side near the first side 111, and the second mounting portion 150 is provided on the side near the second side 112.

[0075] Exemplarily, in some embodiments, sealing water lines are provided on the first side 111 and the second side 112 of the annular electrode outer frame 110, wherein the sealing water lines are annular to enhance the interlocking force between the annular electrode outer frame 110 and the sealing gasket when multiple annular electrode outer frames 110 are stacked, thereby improving sealing performance. Furthermore, a first mounting portion 140 and a second mounting portion 150 are sequentially recessed on the surfaces of the first channel member 120 and the second channel member 130 near the first side 111 of the annular electrode outer frame 110, while only the second mounting portion 150 is provided on the surfaces of the first channel member 120 and the second channel member 130 near the second side 112 of the annular electrode outer frame 110. Therefore, when multiple electrode frame assemblies 100 are used to assemble an electrolytic cell, since the cathode chamber and anode chamber formed between adjacent electrode frame assemblies 100 only need to be separated by a diaphragm 300, the first mounting portion 140 is provided only on the surface of the first channel member 120 and the second channel member 130 near the first side 111 of the annular electrode outer frame 110, and it is not necessary to provide the first mounting portion 140 on the surface near the second side 112 of the annular electrode outer frame 110.

[0076] In some alternative embodiments, the first channel member 120 and the second channel member 130 are respectively disposed on opposite sides of the annular electrode outer frame 110. (Refer to...) Figure 1 and Figure 2 The first channel component 120 and the second channel component 130 are positioned opposite each other at the top and bottom ends of the outer frame 110 in the Z-direction. This allows the first gas outlet channel 121, the second gas outlet channel 122, and the liquid inlet channel 131 to be rationally arranged along the circumference of the annular outer frame 110, thereby improving the uniformity of the flow field and temperature in the electrolytic cell. Furthermore, this arrangement facilitates positioning when assembling the first channel component 120 and the second channel component 130 into the annular outer frame 110, and ensures uniform force distribution when assembling multiple electrode frame assemblies 100 into the electrolytic cell, preventing misalignment when the components are pressed together.

[0077] In some optional embodiments, the first channel component 120 includes: a first transverse partition 123, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame 110, the first transverse partition 123 and the annular electrode outer frame 110 together forming an air outlet cavity; and a first longitudinal partition 124, the two ends of which are respectively connected to the annular electrode outer frame 110 and the first transverse partition 123, so as to divide the air outlet cavity into a first air outlet channel 121 and a second air outlet channel 122. By connecting the first transverse partition 123 and the first longitudinal partition 124 to the annular electrode outer frame 110, the first air outlet channel 121 and the second air outlet channel 122 can be formed, which is convenient and efficient to assemble.

[0078] For example, refer to Figure 1 and Figure 2 The cross-sectional shape of the gas outlet chamber in the XZ plane is arc-shaped. The first longitudinal partition 124 divides the gas outlet chamber into a first gas outlet channel 121 and a second gas outlet channel 122, which is beneficial for maximizing the gas storage volume. It should be understood that in other embodiments, the cross-sectional shape of the gas outlet chamber in the XZ plane can also be circular, elliptical, etc.

[0079] In some optional embodiments, the first diaphragm 123 is provided with a first vent 123a and a second vent 123b respectively communicating with the first vent passage 121 and the second vent passage 122. (Refer to...) Figures 1 to 9 The first transverse partition 123 extends along the X-direction, with both ends fixed to the inner circumference of the annular electrode frame 110. A first mounting portion 140 and a second mounting portion 150 are sequentially provided on the first transverse partition 123. The first longitudinal partition 124 extends along the Z-direction, with its top end fixed to the inner circumference of the annular electrode frame 110 and its bottom end fixed to the middle of the first transverse partition 123. The first longitudinal partition 124 divides the gas outlet chamber formed between the first transverse partition 123 and the annular electrode frame 110 into a first gas outlet channel 121 and a second gas outlet channel 122. The first gas outlet channel 121 and the second gas outlet channel 122 are respectively connected to the electrolysis region through multiple first gas outlet holes 123a and second gas outlet holes 123b penetrating the first transverse partition 123. The gases produced in the cathode chamber and anode chamber in the electrolysis area are respectively led out to the first gas outlet channel 121 and the second gas outlet channel 122 through the first gas outlet 123a and the second gas outlet 123b.

[0080] Therefore, by using the first transverse partition 123 and the first longitudinal partition 124 together, the first air outlet channel 121 and the second air outlet channel 122 can be formed, so there is no need to set the air outlet channel on the circumference of the annular electrode frame 110, which can effectively reduce the processing steps and materials of the annular electrode frame 110.

[0081] It is understood that there can be multiple first longitudinal partitions 124. Multiple first longitudinal partitions 124 divide the gas outlet chamber into more gas outlet channels. Multiple channels are connected to the anode chamber and the cathode chamber respectively for discharging oxygen and hydrogen respectively.

[0082] In some optional embodiments, the number of first vent 123a and second vent 123b is at least one, and the inlets of all first vent 123a and second vent 123b are on the same straight line, while the outlets are on another straight line. Specifically, refer to... Figures 1 to 2 The first diaphragm 123 and the second diaphragm 132 both extend horizontally along the X direction. Therefore, when the pole frame assembly 100 is in operation, the heights between all the first vents 123a, all the second vents 123b, and between the first vents 123a and the second vents 123b are approximately equal. This results in closer pressures between all the first vents 123a, all the second vents 123b, and between the first vents 123a and the second vents 123b, which helps ensure consistent airflow and velocity.

[0083] For example, the first vent 123a and the second vent 123b can be grooved channels directly formed by excavating the first transverse partition 123; alternatively, a detachable component can be provided on the first transverse partition 123, which can be made of non-metallic material, and multiple grooved channels can be provided on the component as the first vent 123a and the second vent 123b. In some cases, when multiple electrode frame assemblies 100, diaphragm 300, sealing gaskets, and other components are assembled to form an electrolytic cell, in order to prevent the sealing gasket from deforming and filling into the first vent 123a and the second vent 123b during the pressing process, a pressure plate can be provided on the side of the first vent 123a and the second vent 123b facing the sealing gasket. The pressure plate forms a barrier against the sealing gasket, thereby preventing the sealing gasket from entering the first vent 123a and the second vent 123b and causing blockage.

[0084] In some optional embodiments, the surfaces of the first venting channel 121, the second venting channel 122, the first venting hole 123a and the second venting hole 123b, and the liquid inlet channel 131 can be coated with alkali-resistant materials, such as polytetrafluoroethylene, ethylene propylene diene monomer (EPDM) rubber, etc., to avoid corrosion.

[0085] Furthermore, in some optional embodiments, the first channel component 120 and the second channel component 130 can be made of non-metallic materials or non-metallic materials coated on a metal surface. The use of non-metallic materials can slow down the corrosion of the electrolytic raw material liquid, such as alkaline solution, extend the life of the first channel component 120 and the second channel component 130, and prevent leakage.

[0086] In some optional embodiments, the second channel component 130 includes: a second transverse partition 132, the two ends of which are respectively connected to the inner side of the annular electrode outer frame 110, the second transverse partition 132 and the annular electrode outer frame 110 together forming a liquid inlet chamber; and a second longitudinal partition 133, the two ends of which are respectively connected to the annular electrode outer frame 110 and the second transverse partition 132, so as to divide the liquid inlet chamber into at least two liquid inlet channels 131. By connecting the second transverse partition 132 and the second longitudinal partition 133 to the annular electrode outer frame 110, at least two liquid inlet channels 131 can be formed, making the assembly of the second channel component 130 and the annular electrode outer frame 110 convenient and efficient.

[0087] In some optional embodiments, the second diaphragm 132 is provided with a liquid inlet hole 132a communicating with the liquid inlet channel 131. (Refer to...) Figures 4 to 5 The structure of the first channel component 120 is shown in the figure. Figure 6 The diagram illustrates the structure of the second channel component 130. Specifically, a second transverse partition 132 extends along the X-direction, with both ends fixed to the inner circumference of the annular electrode frame 110. A second mounting portion 150 and a first mounting portion 140 are sequentially provided on the second transverse partition 132. A second longitudinal partition 133 extends along the Z-direction, with its bottom end fixed to the inner circumference of the annular electrode frame 110 and its top end fixed to the middle of the second transverse partition 132. The second longitudinal partition 133 divides the liquid inlet cavity formed between the second transverse partition 132 and the annular electrode frame 110 into two identical liquid inlet channels 131. The two liquid inlet channels 131 communicate with the electrolysis region through multiple liquid inlet holes 132a penetrating the second transverse partition 132. Therefore, by using the second transverse partition 132 and the second longitudinal partition 133 together, the liquid inlet channel 131 can be formed, so there is no need to set the liquid inlet channel 131 on the outer frame 110 of the annular electrode plate, which can effectively reduce the processing steps and consumables of the outer frame 110 of the annular electrode plate.

[0088] In some optional embodiments, the number of inlet holes 132a is at least one, and the inlets of all inlet holes 132a are on the same straight line, while the outlets are all on another straight line. Specifically, refer to Figures 1 to 2 The first diaphragm 123 and the second diaphragm 132 both extend in the X direction, i.e., horizontally. Therefore, when the pole frame assembly 100 is in operation, the heights of all the liquid inlets 132a are made to be substantially equal, so the pressures of all the liquid inlets 132a are closer, which helps to ensure the consistency of the liquid flow rate and velocity.

[0089] It is understood that there can be multiple second longitudinal partitions 133, which divide the liquid inlet chamber into more liquid inlet channels 131. These multiple liquid inlet channels 131 are respectively connected to the anode chamber and the cathode chamber for supplying alkaline solution. Furthermore, the cross-sectional shape of the liquid inlet chamber in the XZ plane can be the same as or different from the cross-sectional shape of the gas outlet chamber in the XZ plane, as described in the preceding embodiments.

[0090] For example, the installation method between the first transverse partition 123 and the first longitudinal partition 124 and the annular electrode outer frame 110 can be welding, snap-fitting, bonding, partial injection molding, etc., or a positioning structure such as a groove or protrusion can be provided on the inner circumference of the annular electrode outer frame 110 for installation.

[0091] In some alternative embodiments, the edges of the first diaphragm 123 and the second diaphragm 132 are provided with first mounting portions 140. (Refer to...) Figures 1 to 9 Specifically, the first transverse partition 123 and the second transverse partition 132 extend along the X direction. The edge of the first transverse partition 123 is provided with a first mounting portion 140, and the surface of the first mounting portion 140 along the XZ plane is a mounting surface. In some alternative embodiments, the edges of the first transverse partition 123 and the second transverse partition 132 are further provided with a second mounting portion 150 from the surface of the first mounting portion. The second mounting portion 150 and the first mounting portion 140 are connected in a stepped manner, as shown in the figure. Figures 1 to 9 Specifically, a second mounting portion 150 is provided further along the XZ plane from the surface of the first mounting portion 140, and the surface of the second mounting portion 150 along the XZ plane is the mounting surface. This allows the diaphragm 300 or the electrode mesh 400 to be easily mounted on the first transverse partition 123 and the second transverse partition 132. Furthermore, the first mounting portion 140 is provided at the edge, which does not affect the provision of the first vent 123a, the second vent 123b, and the liquid inlet 132a in the central regions of the first transverse partition 123 and the second transverse partition 132, respectively.

[0092] In some optional embodiments, the first channel component 120 further includes: a first connecting plate 125, one side of which is connected to the inner side of the annular electrode outer frame 110, and the other side is connected to the first transverse partition 123 and the first longitudinal partition 124 to form a first air outlet channel 121 and a second air outlet channel 122.

[0093] Reference Figure 5The first connecting plate 125 can be an arc-shaped structure adapted to the annular electrode outer frame 110, which facilitates a stable connection between the first connecting plate 125 and the annular electrode outer frame 110. Furthermore, the first air outlet channel 121 and the second air outlet channel 122 are formed by the first transverse partition 123, the first longitudinal partition 124, and the first connecting plate 125, without relying on the annular electrode outer frame 110, further reducing the processing requirements of the annular electrode outer frame 110. Moreover, the first transverse partition 123 and the first longitudinal partition 124 are connected to the annular electrode outer frame 110 via the first connecting plate 125, which helps to improve the connection strength between the first channel component 120 and the annular electrode outer frame 110.

[0094] For example, in some embodiments, the first connecting plate 125 can be detachably connected to the annular electrode frame 110, which makes the first channel component 120 easy to process, facilitates the replacement and maintenance of the first channel component 120, and will not damage the diaphragm 300, thus helping to reduce costs.

[0095] In some optional embodiments, the second channel component 130 further includes a second connecting plate 134, one side of which is connected to the inner side of the annular electrode outer frame 110, and the other side is connected to the second transverse partition 132 and the second longitudinal partition 133 to form a liquid inlet channel 131.

[0096] Reference Figure 6 The second connecting plate 134 can be an arc-shaped structure adapted to the annular electrode outer frame 110, which facilitates a stable connection between the second connecting plate 134 and the annular electrode outer frame 110. Furthermore, the liquid inlet channel 131 is formed by the second transverse partition 132, the second longitudinal partition 133, and the second connecting plate 134, eliminating the need to rely on the annular electrode outer frame 110, further reducing the processing requirements of the annular electrode outer frame 110. Moreover, the second transverse partition 132 and the second longitudinal partition 133 are connected to the annular electrode outer frame 110 via the second connecting plate 134, which helps to improve the connection strength between the second channel component 130 and the annular electrode outer frame 110.

[0097] For example, in some embodiments, the second connecting plate 134 can be detachably connected to the annular electrode frame 110, which makes the second channel component 130 easy to process, convenient to replace and repair the second channel component 130, and will not damage the diaphragm 300, thus helping to reduce costs.

[0098] Please refer to Figures 1 to 9According to another embodiment of this application, an electrode frame assembly 100 is provided, including an annular electrode outer frame 110, a first channel member 120, and a second channel member 130. The first channel member 120 is disposed on the inner edge of the annular electrode outer frame 110 and forms a first gas outlet channel 121 and a second gas outlet channel 122; the second channel member 130 is disposed on the inner edge of the annular electrode outer frame 110 and forms a liquid inlet channel 131; the electrode outer frame 110, the first channel member 120, and the second channel member 130 form an electrolysis region, the liquid inlet channel 131 is used to feed the electrolysis raw material liquid, such as alkali solution, into the electrolysis region, and the first gas outlet channel 121 and the second gas outlet channel 122 are respectively used to discharge hydrogen and oxygen generated by water electrolysis. In some optional embodiments, the outer frame 110 of the electrode plate, the first channel member 120, and the second channel member 130 form an electrolysis region. The orthogonal projection area of ​​the first venting channel 121 or the second venting channel 122 in the thickness direction (Y-direction) of the annular outer frame 110 is 0.05%-3% of the orthogonal projection area of ​​the electrolysis region in the thickness direction. For example, the orthogonal projection area of ​​the first venting channel 121 or the second venting channel 122 in the Y-direction can be 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.3%, 2.6%, 3.0%, or any value between 0.05% and 3% of the orthogonal projection area of ​​the electrolysis region in the Y-direction. In some optional embodiments, the projected area of ​​the liquid inlet channel 131 in the thickness direction (Y-direction) of the annular electrode outer frame 110 is 0.05%-3% of the projected area of ​​the electrolytic region in the thickness direction. Exemplarily, the projected area of ​​the liquid inlet channel 131 in the Y-direction can be any value between 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.3%, 2.6%, 3.0%, or 0.05%-3% of the projected area of ​​the electrolytic region in the Y-direction. When the annular electrode frame 110 no longer has an outlet channel and a liquid inlet channel, the channels move inward from the circumference of the electrode frame assembly 100. By controlling the projected areas of the first outlet channel 121, the second outlet channel 122, or the liquid inlet channel 131 within the aforementioned suitable range, the effective electrolysis area is not significantly reduced, ensuring that the hydrogen production is not greatly affected. Moreover, compared to a circular electrolysis area, this range-defined electrolysis area can improve the uniformity of the electrolyte flow field and temperature field, avoiding higher temperatures on the two curved edges, and can also increase the current density of the electrolysis area, reducing energy consumption. In some optional embodiments, the sum of the projected areas of the first outlet channel 121 and the second outlet channel 122 in the thickness direction is greater than the projected area of ​​the liquid inlet channel 131 in the thickness direction. This setting can avoid gas trapping and reduce pressure loss in the electrolyzer.

[0099] In some optional embodiments, the first channel component 120 includes: a first transverse partition 123, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame 110, and the first transverse partition and the annular electrode outer frame 110 together form an air outlet cavity; and a first longitudinal partition 124, the two ends of which are respectively connected to the annular electrode outer frame 110 and the first transverse partition 123, so as to divide the air outlet cavity to form a first air outlet channel 121 and a second air outlet channel 122. In some alternative embodiments, the second channel component 130 includes: a second transverse partition 132, the two ends of which are respectively connected to the inner side of the annular electrode outer frame 110, the second transverse partition 132 and the annular electrode outer frame 110 together forming a liquid inlet chamber; and a second longitudinal partition 133, the two ends of which are respectively connected to the annular electrode outer frame 110 and the second transverse partition 132, so as to divide the liquid inlet chamber into at least two liquid inlet channels 131. The specific configuration of the first channel component 120 and the second channel component 130 is described in the foregoing embodiments.

[0100] In some optional embodiments, the annular electrode frame 110 is circular, and the length of the first transverse partition 123 and / or the second transverse partition 132 is 10%-50% of the outer diameter of the annular electrode frame 110. The length of the first transverse partition 123 is its length in the X-direction, and the length of the second transverse partition 132 is its length in the X-direction. For example, the length of the first diaphragm 123 and / or the second diaphragm 132 can be any value between 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50% or 10%-50% of the outer diameter of the annular electrode frame 110. If the lengths of the first diaphragm 123 and / or the second diaphragm 132 are too large, the electrolysis zone space will be too small, resulting in insufficient electrolysis efficiency. If the lengths of the first diaphragm 123 and / or the second diaphragm 132 are too small, the first exhaust channel 121 and the second exhaust channel 122 will be too small, resulting in insufficient exhaust efficiency, trapped gas areas, and potentially even safety issues. When the lengths of the first diaphragm 123 and / or the second diaphragm 132 are within a suitable range in this embodiment, the electrolysis zone enclosed by the first diaphragm 123, the second diaphragm 132, and the annular electrode outer frame 110 will not be too small, ensuring good electrolyte circulation, while also ensuring exhaust efficiency, increasing the current density of the electrolysis zone, and reducing energy consumption.

[0101] In some optional embodiments, the annular electrode frame 110 is circular, and the length of the first longitudinal partition 124 and / or the second longitudinal partition 133 is 1%-5% of the inner diameter of the annular electrode frame 110. Exemplarily, the length of the first longitudinal partition 124 and / or the second longitudinal partition 133 can be any value between 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or 1%-5% of the inner diameter of the annular electrode frame 110. By controlling the lengths of the first longitudinal partition 124 and / or the second longitudinal partition 133 within the aforementioned suitable ranges, it is beneficial to further improve the electrolyte circulation efficiency and the gas emission rate, thereby increasing the current density in the electrolysis region. In some optional embodiments, the extension direction of the second diaphragm 132 is parallel to the extension direction of the first diaphragm 123. In this case, the electrolysis area enclosed by the second diaphragm 132, the first diaphragm 123 and the outer frame of the electrode plate 110 has a more regular shape, so that the electrolysis process is controllable and the electrolysis efficiency is improved.

[0102] Specifically, both the first transverse partition 123 and the second transverse partition 132 extend horizontally along the X-direction. This arrangement ensures that the multiple first vent holes 123a and second vent holes 123b on the first transverse partition 123 are at the same height, and the multiple liquid inlet holes 132a on the second transverse partition 132 are at the same height. This results in closer pressure between the multiple first vent holes 123a and second vent holes 123b, and closer pressure between the multiple liquid inlet holes 132a, which helps ensure consistency in the flow rate and velocity of the vented gas and the flow rate and velocity of the inlet liquid. This prevents the backflow of alkali or gas into the electrolysis zone, improves the flow field, temperature field, and current field distribution in the electrolysis zone, and enhances the current efficiency and reliability of the electrolysis process.

[0103] Furthermore, since the raw materials for manufacturing the diaphragm 300 and the electrode mesh 400 are generally rectangular materials, in this embodiment, since the first horizontal partition 123 and the second horizontal partition 132 are arranged in parallel, the diaphragm 300 and the electrode mesh 400 both have two parallel sides. At this time, it is easier to cut the rectangular material to manufacture the diaphragm 300 and the electrode mesh 400, and the utilization rate of raw materials is higher.

[0104] For example, in some embodiments, the first vent 123a and the second vent 123b, and the liquid inlet 132a are all arranged along the Z direction, i.e., the vertical direction, in order to reduce interference between multiple first vents 123a, multiple second vents 123b, and multiple liquid inlets 132a, resulting in a better flow field.

[0105] In some optional embodiments, the length of the second diaphragm 132 is less than or equal to the length of the first diaphragm 123, wherein the lengths of the second diaphragm 132 and the first diaphragm 123 refer to their dimensions in the X direction. Specifically, the length of the second diaphragm 132 may be equal to or unequal to the length of the first diaphragm 123. When they are unequal, the length of the second diaphragm 132 is less than the length of the first diaphragm 123, thereby forming a larger volume of gas-containing first exhaust channel 121 and second exhaust channel 122, facilitating gas discharge.

[0106] Please refer to Figure 10 According to another embodiment of this application, a bipolar plate assembly 10 is provided, including: an electrode frame assembly 100, a bipolar plate 200, and a diaphragm 300 as described in any of the above embodiments; the bipolar plate 200 is connected to an electrode outer frame 110, a first channel member 120, and a second channel member 130; the diaphragm 300 is installed on one side of the electrode frame assembly 100 along its thickness direction. The bipolar plate assembly 10 of this embodiment includes an electrode frame assembly 100. Based on the structural design of the electrode frame assembly 100 itself, it can reduce processing steps, improve the automation level of electrolytic cell assembly, increase assembly efficiency, and reduce assembly costs. Furthermore, it can improve the sealing performance of the electrolytic cell, effectively ensuring that there is no mutual permeation between the anode chamber and the cathode chamber, thus avoiding affecting the purity of the emitted gas and production safety.

[0107] In some alternative embodiments, the diaphragm 300 is mounted on the first mounting portion 140 of the first channel member 120 and / or the second channel member 130 and the third mounting portion 160 of the annular electrode frame 110.

[0108] In some optional embodiments, the thickness of the bipolar plate 200 is less than the thickness of the annular electrode frame 110, the first channel member 120, and the second channel member 130. Exemplarily, the thickness of the bipolar plate 200 can be any value between 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or 0.5-10mm. The thickness of the annular electrode frame 110 can be any value between 3mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or 3-50mm, which is beneficial for ensuring electrolysis efficiency.

[0109] In some optional embodiments, the annular electrode frame 110, the first channel member 120, and the second channel member 130 are all provided with positioning structures for mounting the bipolar plate 200. For example, refer to... Figure 8 The illustration shows a case where a first positioning part 113 is provided on the inner end face of the annular electrode frame 110, as shown in the reference. Figure 7The illustration shows a case where a second positioning part 123c is provided on the inner end face of the first channel member 120. For example, both the first positioning part 113 and the second positioning part 123c can be configured as a groove that can cooperate with the bipolar plate 200 for mounting and positioning the bipolar plate 200.

[0110] It is understood that in other embodiments, the bipolar plate 200 can also be installed by welding, bonding or other methods with the annular electrode frame 110, the first channel component 120 and the second channel component 130.

[0111] In some optional embodiments, the bipolar plate assembly 10 further includes a sealing structure that at least partially covers the diaphragm 300, the first channel member 120, the second channel member 130, and the annular electrode frame 110 to integrally connect the diaphragm 300 with the first channel member 120, the second channel member 130, and the annular electrode frame 110. Exemplarily, the sealing structure is made of a vulcanizable or plastic material, such as thermosetting resin, thermoplastic resin, or rubber, and is formed by molding or casting onto the surfaces of the diaphragm 300, the first channel member 120, and the second channel member 130. Compared to relying on a separate sealing gasket to compress the diaphragm, this embodiment directly integrally molds a gasket-like material onto the surfaces of the diaphragm 300, the first channel member 120, and the second channel member 130, which helps to ensure a stable connection between the diaphragm 300 and the first channel member 120 and the second channel member 130, and maintains good sealing and insulation performance; at the same time, it eliminates the need for a separate sealing gasket, simplifying the gasket stacking steps during assembly. Therefore, by stacking multiple bipolar plate components 10 as modules, the electrolytic cell can be assembled, which is beneficial for the automated assembly of the electrolytic cell.

[0112] In some optional embodiments, the bipolar plate assembly 10 further includes an electrode mesh 400, which is connected to the annular electrode frame 110, the first channel member 120, and the second channel member 130 and is located between the bipolar plate 200 and the diaphragm 300. Exemplarily, the electrode mesh 400 may be a metal mesh loaded with a catalyst. In some optional embodiments, the bipolar plate assembly 10 further includes a support mesh 500, which is disposed between the bipolar plate 200 and the electrode mesh 400. Specifically, in some embodiments, the bipolar plate assembly 10 further includes an electrode mesh 400 and a support mesh 500. The electrode mesh 400 is fixed to the surface of the second mounting portion 150, and the support mesh 500 is located between the electrode mesh 400 and the bipolar plate 200. During assembly, the bipolar plate 200, the support mesh 500, the electrode mesh 400, and the diaphragm 300 are sequentially fixed within the annular electrode frame 110 by applying a clamping force to form the bipolar plate assembly 10.

[0113] According to another embodiment of this application, an electrolytic cell is provided, including a plurality of stacked bipolar plate assemblies 10. In some optional embodiments, in the operating state of the electrolytic cell, a first channel member 120 is located at the top of the electrolytic cell, and a second channel member 130 is located at the bottom of the electrolytic cell. In some optional embodiments, the electrolytic cell further includes sealing gaskets disposed between adjacent bipolar plate assemblies 10. During electrolytic cell assembly, pre-tightening forces of similar magnitude can be applied to different areas along the circumference of the annular electrode frame 110. The sealing gaskets not only fix the diaphragm 300 to the first channel member 120 and the second channel member 130, but also simultaneously serve a sealing and insulating function.

[0114] Furthermore, each pair of adjacent bipolar plate assemblies 10 forms an electrolytic cell, which includes an anode cell and a cathode cell separated by a diaphragm 300. One side of the corresponding bipolar plate 200 is the anode surface, and the other side is the cathode surface. Because the electrolytic cell of this embodiment uses bipolar plate assemblies 10, its structural design reduces the processing steps of the annular electrode frame 110 and effectively ensures that there is no mutual penetration between the anode and cathode cells, thus avoiding affecting the purity of the emitted gas and production safety.

[0115] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A polar frame assembly, characterized in that, include: Outer frame of the annular electrode plate; The first channel component is disposed on the inner edge of the outer frame of the annular electrode plate, and the first channel component is provided with a first air outlet channel and a second air outlet channel. as well as The second channel component is disposed on the inner edge of the outer frame of the annular electrode plate, and the second channel component is provided with a liquid inlet channel; The first channel member and / or the second channel member have a first mounting portion recessed along the thickness direction of the annular electrode frame at their edges, and the inner edge of the annular electrode frame has a third mounting portion recessed along the thickness direction of the annular electrode frame. The third mounting portion communicates with the first mounting portion and is located on the same plane.

2. The polar frame assembly according to claim 1, characterized in that, The first channel component and / or the second channel component are further provided with a second mounting portion formed by recessing from the surface of the first mounting portion along the thickness direction of the outer frame of the annular electrode plate. The second mounting portion is connected to the first mounting portion in a stepped manner. The inner edge of the outer frame of the annular electrode plate is provided with a fourth mounting portion formed by recessing from the surface of the third mounting portion along the thickness direction of the outer frame of the annular electrode plate. The fourth mounting portion is connected to the second mounting portion and is located on the same plane.

3. The pole frame assembly according to claim 2, characterized in that, The outer frame of the annular electrode plate has a first side and a second side opposite to each other in the thickness direction; The first channel member has a first mounting portion and a second mounting portion sequentially provided on the side near the first side, and the second mounting portion is provided on the side of the first channel member near the second side; and / or The second channel member has a first mounting portion and a second mounting portion arranged sequentially on the side near the first side, and the second channel member has a second mounting portion on the side near the second side.

4. The pole frame assembly according to claim 2, characterized in that, The width of at least one of the first mounting part, the second mounting part, the third mounting part, and the fourth mounting part in the direction parallel to the annular surface of the annular electrode frame is 10%-50% of the width of the annular electrode frame.

5. The pole frame assembly according to any one of claims 1-4, characterized in that, The outer frame of the annular electrode plate is circular, and the width of the outer frame of the annular electrode plate is 2%-10% of the inner diameter of the outer frame of the annular electrode plate.

6. The pole frame assembly according to claim 5, characterized in that, The first channel component includes: A first transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode frame, the first transverse partition and the annular electrode frame together form an air outlet cavity; and A first longitudinal partition plate, the two ends of which are respectively connected to the outer frame of the annular electrode plate and the first transverse partition plate, to divide the air outlet chamber into a first air outlet channel and a second air outlet channel; and / or, The second channel component includes: A second transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame, the second transverse partition and the annular electrode outer frame together forming a liquid inlet chamber; and The second longitudinal partition plate has its two ends connected to the outer frame of the annular electrode plate and the second transverse partition plate, respectively, to divide the liquid inlet chamber into at least two liquid inlet channels.

7. The pole frame assembly according to claim 6, characterized in that, The first mounting portion is provided on the edges of the first and second diaphragms.

8. The pole frame assembly according to claim 7, characterized in that, The first diaphragm is provided with a first air outlet communicating with the first air outlet channel and a second air outlet communicating with the second air outlet channel; and / or, The second diaphragm is provided with a liquid inlet hole that communicates with the liquid inlet channel.

9. The pole frame assembly according to claim 8, characterized in that, The number of first and second air outlets is at least one, and the inlets of all first and second air outlets are on the same straight line, while the outlets are on another straight line; and / or, The number of liquid inlets is at least one, and the inlets of all liquid inlets are on the same straight line, while the outlets are on another straight line.

10. The pole frame assembly according to claim 6, characterized in that, The first channel component further includes: A first connecting plate, one side of which is matched and connected to the inner side of the annular electrode frame, and the other side of which is connected to the first transverse partition and the first longitudinal partition, the first connecting plate, the first transverse partition, and the first longitudinal partition together forming the first air outlet channel and the second air outlet channel; and / or, The second channel component also includes: The second connecting plate has one side that matches and connects to the inner side of the outer frame of the annular electrode plate, and the other side that connects to the second transverse partition and the second longitudinal partition, together forming the liquid inlet channel.

11. A polar frame assembly, characterized in that, include: Outer frame of the annular electrode plate; The first channel component is disposed on the inner edge of the outer frame of the annular electrode plate and forms a first air outlet channel and a second air outlet channel; as well as The second channel component is disposed on the inner edge of the outer frame of the annular electrode plate and forms a liquid inlet channel; The annular electrode frame, the first channel component, and the second channel component form an electrolysis region. The orthographic projection area of ​​the first or second gas outlet channel in the thickness direction of the annular electrode frame is 0.05%-3% of the orthographic projection area of ​​the electrolysis region in the thickness direction. and / or The projected area of ​​the liquid inlet channel in the thickness direction of the outer frame of the annular electrode plate is 0.05%-3% of the projected area of ​​the electrolysis region in the thickness direction.

12. The pole frame assembly according to claim 11, characterized in that, The sum of the projected areas of the first and second air outlet channels in the thickness direction is greater than the projected area of ​​the liquid inlet channel in the thickness direction.

13. The pole frame assembly according to claim 11, characterized in that, The first channel component includes: A first transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode frame, the first transverse partition and the annular electrode frame together form an air outlet cavity; and A first longitudinal partition plate, the two ends of which are respectively connected to the outer frame of the annular electrode plate and the first transverse partition plate, to divide the air outlet chamber into a first air outlet channel and a second air outlet channel; and / or, The second channel component includes: A second transverse partition, the two ends of which are respectively connected to the inner edge of the annular electrode outer frame, the second transverse partition and the annular electrode outer frame together forming a liquid inlet chamber; and The second longitudinal partition plate has its two ends connected to the outer frame of the annular electrode plate and the second transverse partition plate, respectively, to divide the liquid inlet chamber into at least two liquid inlet channels.

14. The pole frame assembly according to claim 13, characterized in that, The outer frame of the annular electrode plate is circular, and the length of the first diaphragm and / or the second diaphragm is 10%-50% of the inner diameter of the outer frame of the annular electrode plate.

15. The pole frame assembly according to claim 13, characterized in that, The outer frame of the annular electrode plate is circular, and the length of the first longitudinal partition and / or the second longitudinal partition is 1%-5% of the inner diameter of the outer frame of the annular electrode plate.

16. A bipolar plate assembly, characterized in that, include: The electrode frame assembly, bipolar plate, and diaphragm according to any one of claims 1-15; The bipolar plate is connected to the outer frame of the annular plate, the first channel component, and the second channel component; The diaphragm is installed on one side of the pole frame assembly along its thickness direction.

17. The bipolar plate assembly according to claim 16, characterized in that, The bipolar plate assembly further includes a sealing structure that at least partially covers the diaphragm, the first channel member, the second channel member, and the annular plate outer frame to integrally connect the diaphragm with the first channel member, the second channel member, and the annular plate outer frame.

18. The bipolar plate assembly according to claim 16, characterized in that, The bipolar plate assembly further includes an electrode mesh, which is connected to the annular electrode frame, the first channel member, and the second channel member and is located between the bipolar plate and the diaphragm.

19. A bipolar plate assembly, characterized in that, include: The electrode frame assembly, bipolar plate, and diaphragm according to any one of claims 1-10; The bipolar plate is connected to the outer frame of the annular plate, the first channel component, and the second channel component; The diaphragm is mounted on one side of the pole frame assembly along its thickness direction; The diaphragm is mounted on the first mounting portion of the first channel member and / or the second channel member and on the third mounting portion of the annular electrode frame.

20. The bipolar plate assembly according to claim 19, characterized in that, The bipolar plate assembly further includes a sealing structure that at least partially covers the diaphragm, the first channel member, the second channel member, and the annular plate outer frame to integrally connect the diaphragm with the first channel member, the second channel member, and the annular plate outer frame.

21. The bipolar plate assembly according to claim 19, characterized in that, The bipolar plate assembly further includes an electrode mesh, which is connected to the annular electrode frame, the first channel member, and the second channel member and is located between the bipolar plate and the diaphragm.

22. An electrolytic cell, characterized in that, The bipolar plate assembly comprising several stacked components as described in any one of claims 16-21.

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