Polar plate and hydrogen production device

Abstract

The application relates to the technical field of hydrogen production, and particularly relates to a polar plate and a hydrogen production device. The polar plate comprises a polar plate body, the polar plate body comprises an anode surface and a cathode surface; the anode surface is provided with an anode water cavity opening and an anode hydrogen cavity opening, the anode water cavity opening is arranged at least in two and located on the horizontal center line of the anode surface, and the anode hydrogen cavity opening is arranged in multiple and uniformly distributed along the circumference of the anode surface and located at the connecting position close to the anode surface; the cathode surface is provided with a cathode water cavity opening and a cathode hydrogen cavity opening, the cathode water cavity opening is arranged at least in two and located on the horizontal center line of the cathode surface, and the cathode hydrogen cavity opening is arranged in multiple and uniformly distributed along the circumference of the cathode surface and located at the connecting position close to the cathode surface; wherein the cathode surface further comprises a cathode flow channel group, the cathode flow channel group is uniformly distributed on the cathode surface and communicates with each cathode hydrogen cavity opening and is used for circulating hydrogen to the cathode hydrogen cavity opening. The application can realize that high-pressure hydrogen uniformly exerts pressure on one side of the polar plate, improve the structural stability, and prevent mechanical damage of high-pressure hydrogen to core components.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology, and in particular to an electrode plate and a hydrogen production device. Background Technology

[0002] In existing circular electrode plates, the gas manifold channels are usually located on both sides of the circular electrode plate. This structural design also cannot prevent high-pressure gas from accumulating on one side of the electrode plate. Although the design of placing the gas channel at the center can achieve a gas pressure exceeding 4MPa, it only places the area where high-pressure gas accumulates at the center, improving its structural stability, but does not fundamentally solve the problem of uniform distribution of high-pressure gas. Summary of the Invention

[0003] This application provides an electrode plate and a hydrogen production device, which aims to achieve a uniform distribution of high-pressure hydrogen gas pressure within the electrode plate.

[0004] This application provides an electrode plate, the electrode plate including an electrode plate body, the electrode plate body being circular, and the electrode plate body including an anode surface and a cathode surface;

[0005] The anode surface has an anode water cavity and an anode hydrogen cavity. There are at least two anode water cavities located on the horizontal center line of the anode surface, and at least two anode water cavities are equidistant from the center of the anode surface. There are multiple anode hydrogen cavities, which are evenly distributed along the circumference of the anode surface at connection positions close to the anode surface.

[0006] The cathode surface has a cathode water cavity and a cathode hydrogen cavity. There are at least two cathode water cavities located on the horizontal center line of the cathode surface, and at least two cathode water cavities are equidistant from the center of the cathode surface. There are multiple cathode hydrogen cavities, which are evenly distributed along the circumference of the cathode surface at connection positions close to the cathode surface, so as to place the high-pressure hydrogen accumulation area close to the connection position.

[0007] The cathode surface further includes a cathode flow channel assembly for hydrogen flow. The cathode flow channel assembly is connected to each of the cathode hydrogen chamber openings, so that the hydrogen generated on the cathode surface can flow along the cathode flow channel assembly to each of the cathode hydrogen chamber openings.

[0008] The cathode flow channel group includes multiple cathode flow channels and multiple cathode protrusions. The multiple cathode protrusions and multiple cathode flow channels are arranged alternately on both sides along the horizontal center line of the cathode surface, and the cathode flow channels are located on the horizontal center line of the cathode surface.

[0009] Each of the cathode protrusions located on both sides of the horizontal centerline of the cathode surface is provided with multiple flow sections. Each flow section is connected to the adjacent cathode flow channel. The flow sections are radially distributed from the center of the cathode surface outwards, and the flow section located at the outermost periphery of the cathode surface is connected to the cathode hydrogen cavity.

[0010] The anode surface also includes an anode flow channel group, which includes multiple anode protrusions and multiple anode flow channels. The positions of the anode protrusions correspond to the positions of the cathode flow channels, and the positions of the anode flow channels correspond to the positions of the cathode protrusions. At least a portion of the anode flow channels are connected to the anode water cavity opening for the flow of electrolyzed water and oxygen.

[0011] Each of the anode flow channels located on both sides of the horizontal center line of the anode surface is also provided with a plurality of protrusions, each of the protrusions being connected to the adjacent anode protrusions, and the positions of the protrusions being set in correspondence with the positions of the flow sections.

[0012] In one possible design, the depth of the flow section is greater than half the height of the cathode protrusion and less than the height of the cathode protrusion.

[0013] In one possible design, a hydrogen cavity groove is also provided around the cathode hydrogen cavity opening;

[0014] The hydrogen cavity groove has a first slot on the side near the cathode flow channel group, and the first slot connects the cathode flow channel group and the cathode hydrogen cavity opening.

[0015] In one possible design, the electrode plate further includes a cathode hydrogen cavity seal located in the hydrogen cavity recess;

[0016] The cathode hydrogen cavity seal is provided with a hydrogen flow section, which is arranged opposite to the first slot.

[0017] In one possible design, the height of the cathode hydrogen cavity seal is equal to the sum of the depth of the hydrogen cavity recess and the height of the cathode protrusion.

[0018] In one possible design, the electrode plate further includes a cathode water cavity seal for sealing the cathode water cavity opening.

[0019] In one possible design, the cathode surface is provided with a cathode groove, and the cathode water cavity, the cathode hydrogen cavity, and the cathode flow channel assembly are located on the bottom wall of the cathode groove;

[0020] The cathode groove is used to place the membrane electrode assembly.

[0021] In one possible design, the electrode plate further includes a cathode seal disposed in the cathode groove and located between the cathode hydrogen cavity opening and the cathode surface.

[0022] In one possible design, the height of the protrusion is less than half the height of the anode protrusion.

[0023] In one possible design, a water cavity groove is provided around the anode water cavity opening;

[0024] The water cavity groove is provided with a second slot corresponding to the anode flow channel, and the second slot connects the anode flow channel and the anode water cavity opening.

[0025] In one possible design, the electrode plate further includes an anode water cavity seal located in the water cavity recess;

[0026] The anode water cavity seal is provided with a water flow section, which is arranged opposite to the second slot.

[0027] In one possible design, the height of the anode water cavity seal is equal to the sum of the depth of the water cavity groove and the height of the anode annular protrusion.

[0028] In one possible design, the electrode plate is further provided with an anodic hydrogen chamber seal, which is used to seal the anodic hydrogen chamber opening.

[0029] In one possible design, the anode surface is provided with an anode groove, and the anode water cavity, the anode hydrogen cavity, and the anode flow channel assembly are located on the bottom wall of the anode groove;

[0030] The anode groove is used to place the membrane electrode assembly.

[0031] In one possible design, the electrode plate further includes an anode seal disposed in the anode groove and located between the connection point of the anode hydrogen cavity and the anode surface.

[0032] In one possible design, the electrode body is a single, integral structure.

[0033] This application also provides a hydrogen production apparatus, the hydrogen production apparatus comprising:

[0034] Membrane electrode assembly;

[0035] The electrode plates are disposed on both sides of the membrane electrode assembly, and the electrode plates are as described above.

[0036] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0037] Figure 1 An exploded view of the electrode plate provided in this application;

[0038] Figure 2 This is a schematic diagram of the structure of the cathode surface of the electrode plate provided in this application in a specific embodiment;

[0039] Figure 3 This is a schematic diagram of the structure of the cathode surface of the electrode plate provided in this application in another specific embodiment;

[0040] Figure 4 for Figure 2 Enlarged diagram of part A in the diagram;

[0041] Figure 5 This application provides a structural schematic diagram of the cathode hydrogen cavity seal;

[0042] Figure 6 for Figure 5 A diagram from another perspective;

[0043] Figure 7 for Figure 2 Enlarged schematic diagram of part B in the diagram;

[0044] Figure 8 This is a schematic diagram of the structure of the anode surface of the electrode plate provided in this application in a specific embodiment;

[0045] Figure 9 This is a schematic diagram of the structure of the anode surface of the electrode plate provided in this application in another specific embodiment;

[0046] Figure 10 for Figure 8 A sectional view along the center CC;

[0047] Figure 11 for Figure 8 Enlarged schematic diagram of part D in the diagram;

[0048] Figure 12 This is a schematic diagram of the structure of the anode water cavity seal provided in this application;

[0049] Figure 13 for Figure 8 Enlarged schematic diagram of part E in the diagram.

[0050] Figure label:

[0051] 1-Electrode plate body;

[0052] 11-Anode surface;

[0053] 111 - Anode water cavity opening;

[0054] 111a - Water cavity groove;

[0055] 112 - Anode hydrogen port;

[0056] 113 - Anode flow channel assembly;

[0057] 113a - Anode protrusion;

[0058] 113b - Anode flow channel;

[0059] 113b1 - Protrusion;

[0060] 114 - Anode groove;

[0061] 115 - Through hole on the anode surface;

[0062] 12-Cathode surface;

[0063] 121 - Cathode water cavity inlet;

[0064] 121a-Hydrogen cavity groove;

[0065] 121a1 - First slot;

[0066] 122 - Cathode hydrogen cavity opening;

[0067] 123 - Cathode flow channel assembly;

[0068] 123a - Cathode flow channel;

[0069] 123b - Cathode protrusion;

[0070] 123b1 - Distribution Department;

[0071] 124 - Cathode groove;

[0072] 125 - Through hole on the cathode surface.

[0073] 2-Cathode hydrogen chamber seal;

[0074] 21-Hydrogen Circulation Section;

[0075] 3-Cathode water cavity seal;

[0076] 4-Cathode seal;

[0077] 5-Anode water cavity seal;

[0078] 51-Water Circulation Department;

[0079] 6-Anodic hydrogen chamber seal;

[0080] 7-Anode seal.

[0081] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0082] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0083] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0084] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0085] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0086] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0087] A proton exchange membrane electrolyzer (PEMWE) mainly consists of a proton exchange membrane, a catalyst, a gas diffusion layer, membrane electrodes, electrode plates, sealing rings, and end plates. The PEM electrolyzer requires an external DC power supply during operation. The anode represents the positive electrode of the electrolyzer, where oxidation (oxygen evolution reaction) occurs; the cathode represents the negative electrode, where reduction (hydrogen evolution reaction) occurs.

[0088] Because hydrogen production systems require large capacities, electrolyzers are composed of multiple individual cells. Each individual cell is a stacked structure consisting of electrode plates and membrane electrode assemblies, forming a single unit for hydrogen production via water electrolysis. Increasing the power of each individual cell allows for a more compact structure and higher power density. PEM electrolyzers can operate under high voltage differentials across the membrane. The PEM water electrolysis process is as follows: water is first pumped to the anode, where it is decomposed into oxygen (O2) and protons (H2O). + ) and electrons (e - Protons pass through the proton exchange membrane into the cathode. Electrons flow from the anode, through the power supply circuit to the cathode, while the power supply provides the driving force (voltage). On the cathode side, two protons and an electron recombine to produce hydrogen gas (H2). Throughout the process, the oxygen evolution reaction at the anode produces a large number of protons (H2). + This results in a highly acidic anode (Ph ~ 2), requiring high corrosion resistance from the materials used in the anode environment. Stable reaction under a certain overvoltage (~2V) is also necessary, making anode research particularly important. During electrolysis, the electrolytic reaction mainly occurs at the solid-liquid-gas three-phase interface, which includes the electrocatalyst (solid phase, acting as an electron transport carrier), water and the Nafion membrane (liquid phase, providing and transferring protons in the anode reaction), and a gas diffusion layer (gas phase, creating gas channels within the catalyst layer for gas transport). The electrolytic performance of the PEM electrolyzer varies under different assembly pressures. Furthermore, the electrolytic reaction takes place in water; both the membrane electrode and electrode plates operate underwater, with water serving as both a coolant and a reactant. Water decomposition is driven by both thermal and electrical energy. The minimum theoretical potential required for water decomposition is 1.23V. If only electrical energy is used for decomposition without thermal energy, the required thermal neutral voltage is 1.48V. In actual reactions, due to the presence of overpotential, the actual reaction voltage is greater than the theoretical voltage. The overpotential is mainly caused by three factors: activation overpotential due to damage during electrochemical activation, ohmic overpotential due to the bulk resistance of the material and the interfacial resistance between different layers, and diffusion overpotential due to the obstruction of reactant and product transport. For specific examples, please refer to JP2011041052 High-Pressure Hydrogen Equipment, CN217757689U An Axial Non-Equidistant Corrugated Plate Electrode Structure, CN217459614U An Anode Frame and its Matching Cathode Frame for a High-Pressure Electrolyzer, CN115528263A A Rectangular Electrode Plate for a High-Power Electrolyzer, CN115341241A A Water Inlet Method for a Proton Exchange Membrane Water Electrolyzer, etc.

[0089] PEM electrolyzers can operate under high pressure across the membrane. The current PEM electrolyzer electrode plate structure is designed with an inlet on one side and an outlet on the other side. Hydrogen gas accumulates at high pressure on one side of the electrode plate, which can easily cause uneven load on the sealing of the electrode plate, leading to mechanical failure. The ultra-high pressure can cause destructive damage to the product.

[0090] To address the aforementioned technical problems, this embodiment provides a hydrogen production device. The device may include a membrane electrode assembly (MEA) and two electrode plates, with the two electrode plates respectively disposed on both sides of the MEA. Alternatively, the hydrogen production device may include n MEA assemblies and n+1 electrode plates, as described above, with the MEA assemblies and electrode plates stacked sequentially, and the outermost two sides along the stacking direction configured as electrode plates, where n≥2.

[0091] Specifically, such as Figure 1 , Figure 2 and Figure 8 As shown, the electrode plate includes an electrode plate body 1, which can be circular. The electrode plate body 1 includes an anode surface 11 and a cathode surface 12 arranged opposite to each other. The anode surface 11 has an anode water cavity 111 and an anode hydrogen cavity 112. There are at least two anode water cavities 111, located on the horizontal center line of the anode surface 11, and at least two anode water cavities 111 are equidistant from the center of the anode surface 11. There are multiple anode hydrogen cavities 112, which are evenly distributed along the circumference of the anode surface 11 at connection positions close to the anode surface 11. The cathode surface 12 has a cathode water cavity 121 and a cathode hydrogen cavity 122. There are at least two cathode water cavities 121, located on the horizontal center line of the cathode surface 12, and at least two cathode water cavities 121 are equidistant from the center of the cathode surface 12. There are multiple cathode hydrogen cavities 122, which are evenly distributed along the circumference of the cathode surface 12 at connection positions close to the cathode surface 12. The cathode surface 12 also includes a cathode flow channel group 123, which is evenly distributed on the cathode surface 12 and connected to each cathode hydrogen cavity 122 for the flow of hydrogen gas to the cathode hydrogen cavity 122.

[0092] In this embodiment, the anode surface 11 faces the anode side of the proton exchange membrane module and is used for the flow of electrolyzed water and generated oxygen, while the cathode surface 12 faces the cathode side of the proton exchange membrane module and is used for the flow of generated hydrogen. The edge of the anode surface 11 has multiple anode surface through holes 115 for its connection points. Figure 2 As shown, the edge of the cathode surface 12 is its connection point, and it has multiple cathode surface through holes 125. The cathode surface through holes 125 are connected to the anode surface through holes 115, and the two can be regarded as a single through hole. The connector can pass through this through hole to connect with other electrode plates. The connector can be a bolt. In this embodiment, there are 12 bolt through holes at the connection point of the electrode plate.

[0093] like Figure 8As shown, there are two anode water inlets 111, which are positioned on the horizontal centerline of the anode surface 11, and are equidistant from the center of the anode surface 11. One anode water inlet 111 can be used as an inlet, and the other as an outlet. Since the cathode water inlet 121 is connected to the anode water inlet 111 on the same electrode body 1, the number and position of the cathode water inlets 121 are the same as those of the anode water inlets 111, but the function of the cathode water inlet 121 is to connect to the anode water inlet 111 on the other electrode body 1.

[0094] like Figure 2 As shown, multiple cathode hydrogen ports 122 are provided for discharging hydrogen gas. These ports are evenly distributed circumferentially along the cathode surface 12 near the through-hole 125. In other words, the multiple cathode hydrogen ports 122 are positioned near the connector, allowing the high-pressure hydrogen accumulation area to be placed close to the connector, and the locking force of the connector ensures the structural stability of the high-pressure accumulation area. Since the anode hydrogen ports 112 and cathode hydrogen ports 122 are connected within the same electrode body 1, the number and position of the anode hydrogen ports 112 are the same as those of the cathode hydrogen ports 122. However, the function of the anode hydrogen ports 112 is to connect to the cathode hydrogen ports 122 of the other electrode body 1.

[0095] In addition, such as Figure 2 As shown, a uniformly distributed cathode flow channel group 123 is also provided on the cathode surface 12. The cathode flow channel group 123 is connected to the cathode hydrogen cavity 122, which enables the hydrogen gas generated at a certain position on the cathode surface 12 to flow along the cathode flow channel group 123 and to each cathode hydrogen cavity 122. This effectively disperses the high-pressure hydrogen gas inside the electrode plate to each cathode hydrogen cavity 122, thereby achieving uniform pressure on one side of the electrode plate by the high-pressure hydrogen gas, improving structural stability, and preventing mechanical damage to the core components by the high-pressure hydrogen gas.

[0096] like Figure 2 and Figure 4 As shown, the cathode flow channel assembly 123 includes multiple cathode flow channels 123a and multiple cathode protrusions 123b. The cathode flow channels 123a are located between adjacent cathode protrusions 123b. The cathode protrusions 123b and cathode flow channels 123a are arranged sequentially on both sides along the horizontal centerline of the cathode surface 12, with the cathode flow channels 123a located on the horizontal centerline of the cathode surface 12. Each cathode protrusion 123b located on both sides of the horizontal centerline of the cathode surface 12 is also provided with multiple flow sections 123b1, and each flow section 123b1 connects to an adjacent cathode flow channel 123a.

[0097] In this embodiment, multiple cathode flow channels 123a and multiple cathode protrusions 123b arranged on both sides of the horizontal centerline of the cathode surface 12 can be assembled into a ring-like structure. The two ends of the multiple cathode protrusions 123b are at a certain distance from the cathode water cavity opening 121, and the distance between the ends of each cathode protrusion 123b and the cathode water cavity opening 121 is equal, forming a ring-like space to facilitate the placement of the cathode water cavity seal 3 of the cathode water cavity opening 121. Figure 7 As shown. In this embodiment, by providing a flow section 123b1 in each cathode protrusion 123b, the cathode channels 123a can be connected through the flow section 123b1, thereby achieving uniform distribution of hydrogen on the cathode surface 12. The flow section 123b1 is located inside the cathode protrusion 123b.

[0098] like Figure 2 and Figure 4 As shown, multiple flow sections 123b1 are radially distributed outward from the center of the cathode surface 12. The positions of the flow sections 123b1 can be located on the line connecting the center of the cathode surface 12 and the center of the cathode hydrogen cavity 122, but the positions of the flow sections 123b1 are not limited to being located only on the line connecting the center of the cathode surface 12 and the center of the cathode hydrogen cavity 122. Figure 3 As shown, if the plate body 1 has a large enough surface area, the flow section 123b1 can be arranged more densely, but the flow section 123b1 is still arranged in a radial pattern from the center of the cathode surface 12 outward to ensure that the high-pressure hydrogen gas is evenly distributed on the cathode surface 12.

[0099] Since the flow section 123b1 is a hole structure inside the cathode protrusion 123b, the depth of the flow section 123b1 is limited to be greater than half the height of the cathode protrusion 123b and less than the height of the cathode protrusion 123b. The flow area of ​​the flow section 123b1 is set as large as possible to facilitate the flow of hydrogen.

[0100] like Figure 4 As shown, a hydrogen cavity groove 121a is also provided around the cathode hydrogen cavity 122. A first slot 121a1 is provided on the side of the hydrogen cavity groove 121a near the cathode flow channel group 123. The first slot 121a1 connects the cathode flow channel group 123 and the cathode hydrogen cavity 122. Specifically, the first slot 121a1 can be directly connected to the flow section 123b1 so that hydrogen gas flows from the cathode flow channel group 123 through the first slot 121a1 to the cathode hydrogen cavity 122.

[0101] In addition, such as Figure 5 and Figure 6As shown, to ensure the sealing of the cathode hydrogen cavity opening 122, the electrode plate also includes a cathode hydrogen cavity seal 2, which is located in the hydrogen cavity groove 121a. The cathode hydrogen cavity seal 2 has a hydrogen flow section 21, which is disposed opposite to the first groove 121a1. The depth of the hydrogen flow section 21 is less than the thickness of the cathode hydrogen cavity seal 2, but greater than the depth of the first groove 121a1, and the width of the hydrogen flow section 21 is the same as the width of the flow section 123b1. This ensures that when the cathode hydrogen cavity seal 2 is placed in the hydrogen cavity groove 121a, the first groove 121a1 and the flow section 123b1 are connected, while also ensuring the sealing of the cathode hydrogen cavity opening 122.

[0102] The height of the cathode hydrogen cavity seal 2 is equal to or slightly higher than the sum of the depth of the hydrogen cavity groove 121a and the height of the cathode protrusion 123b. This ensures that when the electrode plate is stacked with other components (membrane electrode assembly), there will be no gap between the cathode hydrogen cavity opening 122 and other components because the height of the cathode hydrogen cavity seal 2 is lower than the sum of the depth of the hydrogen cavity groove 121a and the height of the cathode protrusion 123b. This guarantees the sealing performance of the cathode hydrogen cavity opening 122 and ensures the flatness of other components when stacked. At the same time, it provides support for the sealing assembly on the opposite side (such as the anode surface 11 or the anode hydrogen cavity seal 6 of the adjacent electrode plate as described below).

[0103] like Figure 1 and Figure 2 As shown, the electrode plate also includes a cathode water cavity seal 3, which is disposed around the cathode water cavity opening 121 to seal the cathode water cavity opening 121. The height of the cathode water cavity seal 3 is equal to or slightly higher than the height of the cathode protrusion 123b, so that when the electrode plate is stacked with other components (membrane electrode assembly), there will be no gap between the cathode water cavity opening 121 and other components due to the height of the cathode water cavity seal 3 being lower than the height of the cathode protrusion 123b. This ensures the flatness of other components when stacked and guarantees the sealing performance of the cathode water cavity opening 121. At the same time, it provides support for the sealing assembly on the opposite side (such as the anode water cavity seal 5 on the anode side or adjacent electrode plate as described below).

[0104] like Figure 1 and Figure 2 As shown, the cathode surface 12 has a cathode groove 124 inside. The cathode water cavity 121, cathode hydrogen cavity 122, and cathode flow channel assembly 123 are located on the bottom wall of the cathode groove 124. That is, except for the connection position of the cathode surface 12, all other structures are set in the cathode groove 124. The cathode groove 124 is used to place the membrane electrode assembly or diffusion layer assembly so that the membrane electrode assembly or diffusion layer assembly can be placed in the middle of two electrode plates when stacked (the space formed by the cathode groove 124 and the anode groove 114 mentioned below), ensuring that the stacked structure has process stability and assembly consistency.

[0105] like Figure 1 and Figure 2 As shown, the electrode plate also includes a cathode seal 4, which is disposed in the cathode groove 124 and located between the cathode hydrogen cavity 122 and the cathode surface 12. It is used to ensure the overall sealing of the cathode surface 12, and the height of the cathode seal 4 is equal to or slightly greater than the height of the cathode protrusion 123b to ensure the flatness when other components are stacked.

[0106] Among them, the cathode seal 4 and the cathode hydrogen seal can be an integral structure, which can be integrally molded or bonded together for easy assembly.

[0107] like Figure 8 As shown, in some embodiments, the anode surface 11 further includes an anode flow channel group 113, which is uniformly distributed on the anode surface 11, and at least a portion of the anode flow channel group 113 is connected to the anode water cavity 111 for the flow of electrolyzed water, so that the electrolyzed water can flow along the anode flow channel group 113 to the membrane electrode assembly or to another anode water cavity 111.

[0108] Specifically, such as Figure 8 , Figure 10 and Figure 11 As shown, the anode flow channel assembly 113 includes multiple anode protrusions 113a and multiple anode flow channels 113b. The anode protrusions 113a and anode flow channels 113b are arranged sequentially to both sides along the horizontal centerline of the anode surface 11, with the anode protrusions 113a located on the horizontal centerline of the anode surface 11. The anode flow channels 113b are located between adjacent anode protrusions 113a, and the positions of the anode protrusions 113a correspond to the positions of the cathode flow channels 123a.

[0109] In this embodiment, multiple anode channels 113b and multiple anode protrusions 113a arranged on both sides of the horizontal centerline of the anode surface 11 can be assembled into a ring-like structure. Most of the anode channels 113b are connected to two anode water chambers 111 at both ends, while the ends of a small number of anode channels 113b that are not connected to the two anode water chambers 111 extend outward. The anode protrusions 113a of the anode surface 11 are positioned opposite to the cathode channels 123a of the cathode surface 12, so that the anode protrusions 113a can buffer the pressure exerted on the electrode by the high-pressure hydrogen gas accumulated at the cathode channels 123a, thereby improving the structural strength of the electrode.

[0110] like Figure 8 and Figure 9 , Figure 11 and Figure 13As shown, each anode flow channel 113b located on both sides of the horizontal centerline of the anode surface 11 is also provided with multiple protrusions 113b1, each protrusion 113b1 being connected to an adjacent anode protrusion 113a. The protrusions 113b1 are radially distributed outward from the center of the anode surface 11, and the positions of the protrusions 113b1 can be located on the line connecting the center of the anode surface 11 and the center of the anode hydrogen cavity 112. Figure 9 As shown, if the plate surface of the electrode body 1 is large enough, the protrusions 113b1 can be arranged more densely, but the protrusions 113b1 still radiate outward from the center of the anode surface 11. Specifically, the positions of the protrusions 113b1 correspond to the positions of the flow sections 123b1. Since the position of the protrusions 113b1 on one electrode plate corresponds to the position of the flow section 123b1 on another adjacent flow electrode plate, this embodiment provides protrusions 113b1 in each anode flow channel 113b. When the electrolyzed water flows to the protrusions 113b1, it causes the electrolyzed water to rise upward, applying an upward force to the membrane electrode assembly or diffusion layer. This allows the protrusions 113b1 to buffer the pressure exerted by the high-pressure hydrogen gas in the flow section 123b1 on the other electrode plate on the membrane electrode assembly or diffusion layer when the high-pressure hydrogen gas accumulates in the flow section 123b1 on the other electrode plate and applies high pressure to the membrane electrode assembly or diffusion layer.

[0111] The height of the protrusion 113b1 is less than half the height of the anode protrusion 113a, so that some of the electrolyzed water can pass over the protrusion 113b1 near the anode water cavity 111 which is responsible for the flow of electrolyzed water, and flow along the anode flow channel 113b.

[0112] like Figure 11 As shown, a water cavity groove 111a is provided around the anode water cavity opening 111. The water cavity groove 111a has a second slot corresponding to the anode flow channel 113b. The second slot connects the anode flow channel 113b and the anode water cavity opening 111. Specifically, the second groove can be connected to a portion of the anode flow channel 113b, so that electrolyzed water flows from the anode flow channel 113b through the second groove to the anode water cavity opening 111.

[0113] In addition, such as Figure 12 As shown, to ensure the sealing of the anode water cavity opening 111, the electrode plate also includes an anode water cavity seal 5. The anode water cavity seal 5 is located in the water cavity groove 111a and has a water flow section 51, which is arranged opposite to the second groove opening. The depth of the water flow section 51 is less than the thickness of the anode water cavity seal 5 and greater than the depth of the second groove opening. The width of each water flow section 51 is consistent with the width of each anode flow channel 113b. This ensures that when the anode water cavity seal 5 is placed in the water cavity groove 111a, it satisfies the requirement that the second groove opening and the anode flow channel 113b are connected while ensuring the sealing of the anode water cavity opening 111.

[0114] The height of the anode water cavity seal 5 is equal to or slightly higher than the sum of the depth of the water cavity groove 111a and the height of the anode annular protrusion. This ensures that when the electrode plate is stacked with other parts (membrane electrode assembly), there will be no gap between the anode water cavity opening 111 and other components because the height of the anode water cavity seal 5 is lower than the sum of the depth of the water cavity groove 111a and the height of the anode annular protrusion. This guarantees the sealing performance of the anode water cavity opening 111 and ensures the flatness of other components when stacked. At the same time, it provides support for the sealing assembly on the opposite side (such as the cathode surface 12 or the cathode water cavity seal 3 of the adjacent electrode plate mentioned above).

[0115] like Figure 1 and Figure 8 As shown, the electrode plate is also provided with an anodic hydrogen cavity seal 6, which is disposed around the anodic hydrogen cavity opening 112 and is used to seal the anodic hydrogen cavity opening 112. The height of the anodic hydrogen cavity seal 6 is equal to or slightly higher than the height of the anode protrusion 113a, so that when the electrode plate is stacked with other components (membrane electrode assembly), there will be no gap between the anodic hydrogen cavity opening 112 and other components due to the height of the anodic hydrogen cavity seal 6 being lower than the height of the anode protrusion 113a. This ensures the sealing of the anodic hydrogen cavity opening 112 and satisfies the flatness when other components are stacked. At the same time, it provides support for the sealing assembly on the opposite side (such as the cathode surface 12 or the cathode hydrogen cavity opening 122 of the adjacent electrode plate mentioned above).

[0116] like Figure 8 As shown, the anode surface 11 is provided with an anode groove 114. The anode water cavity 111, the anode hydrogen cavity 112, and the anode flow channel assembly 113 are located on the bottom wall of the anode groove 114. That is, except for the connection position of the anode surface 11, all other structures on the anode surface 11 are set in the anode groove 114. The anode groove 114 is used to place the membrane electrode assembly so that the membrane electrode assembly or diffusion layer assembly can be placed in the middle of two electrode plates when stacked (the space formed by the anode groove 114 and the cathode groove 124 mentioned above), ensuring that the stacked structure has process stability and assembly consistency.

[0117] like Figure 1 and Figure 8 As shown, the electrode plate also includes an anode seal 7, which is disposed in the anode groove 114 and located between the anode hydrogen cavity opening 112 and the anode surface 11, to ensure the overall sealing of the anode surface 11. The height of the anode seal 7 is equal to or slightly greater than the height of the anode protrusion 113a, ensuring flatness when other components are stacked.

[0118] Among them, the anode seal 7 and the anode hydrogen cavity seal 6 can be an integral structure, which can be integrally molded or bonded together for easy assembly.

[0119] In a hydrogen production device formed by stacked electrodes, the cathode water cavity seal 3 of one electrode is pressed against one side of a membrane electrode assembly, and the anode water cavity seal 5 of another electrode is pressed against the other side of the membrane electrode assembly, thus sealing the cathode water cavity 121 of one electrode and opening the anode water cavity 111 of the other electrode. Similarly, the anode hydrogen cavity seal 6 of one electrode is pressed against one side of a membrane electrode assembly, and the cathode hydrogen cavity seal 6 of another electrode is pressed against the other side of the membrane electrode assembly, thus sealing the anode hydrogen cavity 112 of one electrode and opening the cathode hydrogen cavity 122 of the other electrode.

[0120] It should be noted that if a diffusion layer assembly is provided, the diffusion layer assembly needs to be located inside the overall seal of the electrode plate, and the diffusion layer assembly needs to have the same through holes as each cavity of the electrode plate to ensure effective high-pressure sealing.

[0121] In some embodiments, the electrode body 1 is an integral structure, that is, the electrode body 1 can be integrally molded, without the need to set an electrode frame, which simplifies the manufacturing process and saves manufacturing time.

[0122] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrode plate, characterized in that, The electrode plate includes an electrode plate body, which is circular and includes an anode surface and a cathode surface. The anode surface has an anode water cavity and an anode hydrogen cavity. There are at least two anode water cavities located on the horizontal center line of the anode surface, and at least two anode water cavities are equidistant from the center of the anode surface. There are multiple anode hydrogen cavities, which are evenly distributed along the circumference of the anode surface at connection positions close to the anode surface. The cathode surface has a cathode water cavity and a cathode hydrogen cavity. There are at least two cathode water cavities located on the horizontal center line of the cathode surface, and at least two cathode water cavities are equidistant from the center of the cathode surface. There are multiple cathode hydrogen cavities, which are evenly distributed along the circumference of the cathode surface at connection positions close to the cathode surface, so as to place the high-pressure hydrogen accumulation area close to the connection position. The cathode surface further includes a cathode flow channel assembly for hydrogen flow. The cathode flow channel assembly is connected to each of the cathode hydrogen chambers so that the hydrogen generated on the cathode surface can flow along the cathode flow channel assembly to each of the cathode hydrogen chambers. The cathode flow channel assembly includes multiple cathode flow channels and multiple cathode protrusions. The multiple cathode protrusions and multiple cathode flow channels are arranged alternately on both sides along the horizontal centerline of the cathode surface, and the cathode flow channels are located on the horizontal centerline of the cathode surface. Each cathode protrusion located on both sides of the horizontal centerline of the cathode surface is also provided with multiple flow sections. The flow section is a hole structure disposed inside the cathode protrusion. Each flow section connects to the adjacent cathode flow channel. The flow sections are distributed radially outward from the center of the cathode surface. The flow sections are located on the line connecting the center of the cathode surface and the center of the cathode hydrogen cavity. The flow section located at the outermost periphery of the cathode surface is connected to the cathode hydrogen cavity. The anode surface also includes an anode flow channel group, which includes multiple anode protrusions and multiple anode flow channels. The positions of the anode protrusions correspond to the positions of the cathode flow channels, and the positions of the anode flow channels correspond to the positions of the cathode protrusions. At least a portion of the anode flow channels are connected to the anode water cavity opening for the flow of electrolyzed water and oxygen. Each of the anode flow channels located on both sides of the horizontal center line of the anode surface is also provided with a plurality of protrusions, each of the protrusions being connected to the adjacent anode protrusions, and the positions of the protrusions being set in correspondence with the positions of the flow sections.

2. The electrode plate according to claim 1, characterized in that, The depth of the flow section is greater than half the height of the cathode protrusion and less than the height of the cathode protrusion.

3. The electrode plate according to claim 1, characterized in that, The cathode hydrogen cavity opening is also surrounded by a hydrogen cavity groove; The hydrogen cavity groove has a first slot on the side near the cathode flow channel group, and the first slot connects the cathode flow channel group and the cathode hydrogen cavity opening.

4. The electrode plate according to claim 3, characterized in that, The electrode plate also includes a cathode hydrogen cavity seal, which is located in the hydrogen cavity groove. The cathode hydrogen cavity seal is provided with a hydrogen flow section, which is arranged opposite to the first slot.

5. The electrode plate according to claim 4, characterized in that, The height of the cathode hydrogen cavity seal is equal to the sum of the depth of the hydrogen cavity groove and the height of the cathode protrusion.

6. The electrode plate according to claim 1, characterized in that, The electrode plate also includes a cathode water cavity seal, which is used to seal the cathode water cavity opening.

7. The electrode plate according to claim 1, characterized in that, The cathode surface is provided with a cathode groove, and the cathode water cavity inlet, the cathode hydrogen cavity inlet and the cathode flow channel assembly are located on the bottom wall of the cathode groove; The cathode groove is used to place the membrane electrode assembly.

8. The electrode plate according to claim 7, characterized in that, The electrode plate also includes a cathode seal, which is disposed in the cathode groove and located between the cathode hydrogen cavity opening and the cathode surface.

9. The electrode plate according to claim 1, characterized in that, The height of the protrusion is less than half the height of the anode protrusion.

10. The electrode plate according to claim 1, characterized in that, The anode water cavity opening is surrounded by a water cavity groove; The water cavity groove is provided with a second slot corresponding to the anode flow channel, and the second slot connects the anode flow channel and the anode water cavity opening.

11. The electrode plate according to claim 10, characterized in that, The electrode plate also includes an anode water cavity seal, which is located in the water cavity groove; The anode water cavity seal is provided with a water flow section, which is arranged opposite to the second slot.

12. The electrode plate according to claim 11, characterized in that, The height of the anode water cavity seal is equal to the sum of the depth of the water cavity groove and the height of the anode annular protrusion.

13. The electrode plate according to claim 1, characterized in that, The electrode plate is also provided with an anodic hydrogen cavity seal, which is used to seal the anodic hydrogen cavity opening.

14. The electrode plate according to claim 1, characterized in that, The anode surface is provided with an anode groove, and the anode water cavity, the anode hydrogen cavity, and the anode flow channel assembly are located on the bottom wall of the anode groove; The anode groove is used to place the membrane electrode assembly.

15. The electrode plate according to claim 14, characterized in that, The electrode plate also includes an anode seal, which is disposed in the anode groove and located between the connection position of the anode hydrogen cavity and the anode surface.

16. The electrode plate according to any one of claims 1 to 15, characterized in that, The electrode plate body is a one-piece structure.

17. A hydrogen production apparatus, characterized in that, The hydrogen production device includes: Membrane electrode assembly; An electrode plate is disposed on both sides of the membrane electrode assembly, and the electrode plate is the electrode plate according to any one of claims 1 to 16.

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