Bipolar plate and square electrolytic bath

Abstract

The bipolar plate comprises two polar plates, namely an anode plate and a cathode plate, strip-shaped protrusions and block-shaped protrusions are formed on the polar plates in a punching mode, the length direction of the strip-shaped protrusions is consistent with the length direction of the polar plates, the block-shaped protrusions are arranged at the two ends of the strip-shaped protrusions in the length direction, and the strip-shaped protrusions and the block-shaped protrusions are arranged in a staggered mode. The blocky protrusions located at the two ends of the strip-shaped protrusion are symmetrically arranged, and the bipolar plate is formed after the two punch-formed polar plates are connected in a welded mode. The bipolar plate disclosed by the scheme is manufactured by adopting a mode of firstly stamping and then welding, the manufacturing mode is simple, the processing flow of the bipolar plate is simplified, excessive processing technologies and complicated dies are not needed, and the manufacturing cost and difficulty of the bipolar plate are reduced; and meanwhile, the front and back surfaces of the obtained bipolar plate are symmetrical in structure, so that the consistency of contact resistance between the bipolar plate and an electrode can be ensured.

Description

Technical Field

[0001] This application relates to the field of electrolytic cell technology, and in particular to a bipolar plate and a square electrolytic cell. Background Technology

[0002] Hydrogen production is generally carried out using water electrolysis technology, which employs electrolysis cell equipment.

[0003] Electrolytic cell equipment includes square electrolytic cells and circular electrolytic cells. Circular electrolytic cells need to operate under high pressure, while square electrolytic cells operate under normal pressure, making them safer to maintain than circular electrolytic cells.

[0004] In related technologies, a nipple structure is provided on the bipolar plate of a square electrolytic cell. The electrolyte passes through the tortuous gaps formed by the nipple structure, which helps to enhance the disturbance of electrolyte flow and make the electrolyte distribution more uniform.

[0005] However, bipolar plates with papillary structures need to be 2-3 mm thick. The papillary structure is usually formed by stamping, which requires high precision of the mold, resulting in high manufacturing cost and difficulty for bipolar plates.

[0006] Therefore, how to solve the problem of high manufacturing cost of bipolar plates caused by the high precision requirements of the mold due to the nipple structure has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] This application proposes a bipolar plate to address the high manufacturing cost of bipolar plates caused by the high precision requirements of the mold due to the nipple structure. This application also proposes a square electrolytic cell.

[0008] To achieve the above objectives, this application provides a bipolar plate comprising two plates, wherein the thickness of the plates is 0.3mm-0.5mm.

[0009] The electrode plate is stamped with strip-shaped protrusions and block-shaped protrusions. The length direction of the strip-shaped protrusions is consistent with the length direction of the electrode plate. A main flow channel is formed between two adjacent strip-shaped protrusions. The block-shaped protrusions are symmetrically arranged at both ends of the length direction of the strip-shaped protrusions. A diffusion flow channel is formed between two adjacent block-shaped protrusions. The back sides of the two electrode plates are attached to each other, and the two bipolar plates are welded together at the positions corresponding to the main flow channel and the diffusion flow channel. The back side of the electrode plate is the side opposite to where the strip-shaped protrusions and block-shaped protrusions are formed.

[0010] Preferably, in the above-mentioned bipolar plate, the cross-section of the strip protrusion is at least one of rectangular, triangular, trapezoidal and semi-circular.

[0011] Preferably, in the above-mentioned bipolar plate, the cross-section of the strip protrusion along its own length direction is at least one of V-shaped, wavy, and trapezoidal.

[0012] Preferably, in the above-mentioned bipolar plate, the cross-section of the block protrusion along the plane of the plate is at least one of polygonal, elliptical and circular.

[0013] Preferably, in the above bipolar plate, multiple rows of block protrusions are arranged along the length direction of the strip protrusions, and each row of block protrusions corresponds to the position of the strip protrusions or corresponds to the position of the main channel, and the straight line where each row of block protrusions is located is perpendicular to the length direction of the strip protrusions.

[0014] Preferably, in the above-mentioned bipolar plate, the block protrusions in adjacent rows are staggered.

[0015] Preferably, in the above-mentioned bipolar plate, auxiliary positioning holes are provided at both ends of the plate along its length.

[0016] Preferably, in the above-mentioned bipolar plate, the plate is a stainless steel plate.

[0017] A square electrolytic cell is characterized by comprising a left end plate, a first insulating pad, a positive conductive plate, an anode blind plate, a diaphragm, a bipolar plate, a negative conductive plate, a second insulating pad, and a right end plate arranged in sequence, wherein the bipolar plate is the bipolar plate described in any of the above embodiments.

[0018] Preferably, in the above-mentioned square electrolytic cell, the diaphragm is a PPS cloth or a composite diaphragm.

[0019] The bipolar plate provided in this application includes two plates, an anode plate and a cathode plate. The plates are stamped with strip-shaped protrusions and block-shaped protrusions. The length direction of the strip-shaped protrusions is consistent with the length direction of the plate. Block-shaped protrusions are provided at both ends of the strip-shaped protrusions, and the block-shaped protrusions at both ends of the strip-shaped protrusions are symmetrically arranged. The two stamped plates are welded together to form the bipolar plate. The bipolar plate disclosed in this solution is manufactured by stamping followed by welding, which is simple and simplifies the bipolar plate processing flow. It does not require excessive processing techniques and complex molds, reducing the manufacturing cost and difficulty of the bipolar plate. Furthermore, the resulting bipolar plate has a symmetrical structure on both sides, ensuring the consistency of the contact resistance between the bipolar plate and the electrodes.

[0020] This solution also discloses a square electrolytic cell, including a bipolar plate. The bipolar plate is the same as the bipolar plate described in any of the above solutions. Since the bipolar plate has the above-mentioned technical effects, the square electrolytic cell with the bipolar plate also has the same technical effects, which will not be elaborated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0022] Figure 1 This is a schematic diagram of the bipolar plate provided in an embodiment of this application;

[0023] Figure 2 This is a left view of the bipolar plate provided in the embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of a strip-shaped protrusion provided in one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the strip-shaped protrusion provided in another embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of the strip-shaped protrusion provided in another embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the block-shaped protrusion provided in one embodiment of this application;

[0028] Figure 7 This is a schematic diagram of the block-shaped protrusion provided in another embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the block-shaped protrusion provided in another embodiment of this application;

[0030] Figure 9 This is an isometric view of the square electrolytic cell assembly provided in the embodiments of this application.

[0031] in:

[0032] 1-Electrode plate; 11-Strip-shaped protrusion; 12-Block-shaped protrusion; 13-Main flow channel; 14-Diffusion channel; 15-Auxiliary positioning hole;

[0033] 2-Left end plate;

[0034] 3-Right end plate; 31-Alkali inlet of cathode chamber; 32-Alkali inlet of anode chamber; 33-Alkali outlet of cathode chamber; 34-Alkali outlet of anode chamber. Detailed Implementation

[0035] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0036] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0037] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0038] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0039] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document 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. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0040] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] Please see Figures 1-9 .

[0042] This application discloses a bipolar plate, including two plates 1, namely an anode plate 1 and a cathode plate 1, which have the same structure.

[0043] The electrode plate 1 is stamped with strip-shaped protrusions 11 and block-shaped protrusions 12. The length direction of the strip-shaped protrusions 11 is consistent with the length direction of the electrode plate 1, and block-shaped protrusions 12 are provided at both ends of the length direction of the strip-shaped protrusions 11. The block-shaped protrusions 12 at both ends of the strip-shaped protrusions 11 are symmetrically arranged. Optionally, the thickness of the strip-shaped protrusions 11 and the block-shaped protrusions 12 is equal along the direction perpendicular to the plane of the electrode plate 1.

[0044] In related technologies, the electrode plate 1 of the nipple structure is made of carbon steel. Carbon steel has high hardness and a wall thickness of 2mm-3mm. After stamping, it has a large amount of springback deformation. In addition, the material has high hardness but low ductility, resulting in a large nipple spacing error of 0.3mm-0.5mm. This solution uses a material with better ductility to make the electrode plate, reducing the amount of springback after stamping and reducing the thickness of the electrode plate 1. The thickness of a single electrode plate 1 is controlled at about 1mm, and the overall thickness of the double electrode plate is controlled at about 2mm. At the same time, the protrusions are changed to strip-shaped and block-shaped protrusions 12, and the welding position of the two electrode plates is flat, improving the accuracy.

[0045] like Figure 1 As shown, the flow channel formed between two adjacent strip protrusions 11 is the main flow channel 13, and the flow channel formed between two adjacent block protrusions 12 is the diffusion flow channel 14. The diffusion flow channels 14 are symmetrically distributed on both sides of the main flow channel 13. The electrolyte flows through the diffusion flow channel 14, the main flow channel 13 and the diffusion flow channel 14 in sequence.

[0046] In related technologies, the flow channel of the bipolar plate is a straight flow channel. This solution optimizes the flow channel, including a diffusion channel 14 and a main flow channel 13. The diffusion channel can change the flow direction of the electrolyte, so that the electrolyte can flow either along the length of the electrode 1 or along the length perpendicular to the electrode 1. The electrolyte repeatedly changes its flow direction in the diffusion channel 14, which promotes the full and uniform flow of the fluid and can avoid gas accumulation, enhance the separation of hydrogen and oxygen, and help the gas to be discharged as soon as possible, providing a good foundation for large-scale production scenarios.

[0047] Two stamped electrode plates 1 are welded together to form a bipolar plate. Specifically, the side of electrode plate 1 with strip-shaped protrusions 11 and block-shaped protrusions 12 formed by stamping is the front side of electrode plate 1, and the other side of electrode plate 1 is the back side. After the back sides of the two electrode plates 1 are attached to each other, the two electrode plates 1 are welded together at the positions corresponding to the main flow channel 13 and the diffusion flow channel 14. Sealing rings can be embedded in some flow channels to form an internal seal of the bipolar plate, reducing the amount of electrolyte entering between the two electrode plates 1.

[0048] The bipolar plate disclosed in this solution is manufactured by stamping followed by welding, which is simple and simplifies the bipolar plate processing flow. It does not require excessive processing technology and complex molds, thus reducing the manufacturing cost and difficulty of the bipolar plate. At the same time, the resulting bipolar plate has a symmetrical structure on both sides, which can ensure the consistency of the contact resistance between the bipolar plate and the electrode.

[0049] The bipolar plate disclosed in this solution reduces the thickness of plate 1 to 0.3mm-0.5mm. Compared with bipolar plates with papillary structures in related technologies, the overall thickness of the bipolar plate is reduced, the overall weight of the bipolar plate is lighter, and the manufacturing cost is reduced. At the same time, due to the reduced thickness of the bipolar plate, the thickness of the assembled bipolar plate is 1mm-2mm, which allows more bipolar plates to be arranged in the electrolytic cell, thus helping to improve the electrolysis efficiency of the electrolytic cell.

[0050] The cross-section of the strip protrusion 11 along its length direction is at least one of rectangle, triangle, trapezoid, and semicircle. Multiple strip protrusions 11 are arranged side by side on the electrode plate 1 along its length direction perpendicular to the electrode plate 1. The cross-sectional shapes of the multiple strip protrusions 11 may be the same or different. In embodiments where the cross-sectional shapes of the multiple strip protrusions 11 are different, the multiple strip protrusions 11 are arranged symmetrically with respect to the center of the electrode plate 1.

[0051] In some embodiments, the cross-section of the strip protrusion 11 along its length is at least one of V-shaped, wavy, and trapezoidal.

[0052] Figure 3 In one embodiment, the strip protrusion 11 is V-shaped along its length. Multiple V-shaped strip protrusions 11 are arranged side by side along the width of the electrode plate 1. The main channel 13 formed between two adjacent V-shaped strip protrusions 11 has the same shape and equal size.

[0053] Figure 4 In one embodiment, the strip protrusion 11 is wavy along its length. Multiple wavy strip protrusions 11 are arranged side by side along the width of the electrode plate 1. The main channel 13 formed between two adjacent wavy strip protrusions 11 has the same shape and the same size.

[0054] Figure 5 In one embodiment, the strip protrusion 11 is trapezoidal in shape along its length. The cross-section of the strip protrusion 11 along the plane of the electrode plate 1 is trapezoidal. The width of the first end of the trapezoidal strip protrusion 11 is smaller than the width of the second end of the trapezoidal strip protrusion 11. The first and second ends of two adjacent trapezoidal strip protrusions 11 are opposite. The extension direction of the main channel 13 formed between two adjacent trapezoidal strip protrusions 11 is consistent with the extension direction of the sidewall of the trapezoidal strip protrusion 11. The two main channels 13 formed by the three trapezoidal strip protrusions 11 are arranged in a figure-eight shape.

[0055] The multiple strip protrusions 11 provided on the electrode plate 1 can have the same shape or different shapes. In embodiments where the multiple strip protrusions 11 provided on the electrode plate 1 have different shapes, the multiple strip protrusions 11 are arranged symmetrically with respect to the center of the electrode plate 1. The multiple strip protrusions 11 can be a combination of V-shaped strip protrusions 11 and wavy strip protrusions 11, a combination of V-shaped strip protrusions 11 and trapezoidal strip protrusions 11, a combination of wavy strip protrusions 11 and trapezoidal strip protrusions 11, and a combination of V-shaped strip protrusions 11, wavy strip protrusions 11 and trapezoidal strip protrusions 11.

[0056] Along the length of the strip protrusion 11, the strip protrusion 11 may have only one shape, or it may be a combination of two or more shapes.

[0057] The strip protrusion 11 is not limited to the shape described above, but can also be other shapes, which are not specifically limited here.

[0058] The cross-section of the block protrusion 12 along the plane of the electrode plate 1 can be at least one of polygon, ellipse and circle.

[0059] Polygons can be rectangles, rhombuses, and triangles. Figure 6 In embodiments where the block protrusion 12 has a hexagonal or triangular cross-section along the plane of the electrode plate 1, the block protrusion 12 is provided at both ends of the electrode plate 1 along its length. The block protrusion 12 located at one end of the electrode plate 1 along its length may have only one shape, or the block protrusion 12 in different regions may have different shapes. The specific arrangement is determined by those skilled in the art according to actual needs, and is not specifically limited here.

[0060] Figure 7 In one embodiment, the cross-section of the block protrusion 12 along the plane of the electrode plate 1 is elliptical, and the elliptical block protrusion 12 is symmetrically arranged at both ends of the electrode plate 1 along its length.

[0061] The block-shaped protrusions 12 and the strip-shaped protrusions 11 can be positioned opposite each other, that is, one strip-shaped protrusion 11 corresponds to one row of block-shaped protrusions 12, and each row of block-shaped protrusions 12 is arranged sequentially along the extending direction of the strip-shaped protrusions 11. For example... Figure 1 As shown, this is an embodiment in which the cross-section of the strip protrusion 11 is rectangular and the cross-section of the block protrusion 12 along the plane of the electrode plate 1 is square. The strip protrusion 11 and the block protrusion 12 are positioned correspondingly, and multiple block protrusions 12 are arranged sequentially along the length of the strip protrusion 11.

[0062] The block protrusions 12 can correspond to the position of the main channel 13 between two adjacent strip protrusions 11, that is, one main channel 13 corresponds to one row of block protrusions 12, and each row of block protrusions 12 is arranged sequentially along the extension direction of the main channel 13.

[0063] In some embodiments, multiple rows of block protrusions 12 are arranged along the length direction perpendicular to the strip protrusion 11, with adjacent rows of block protrusions 12 staggered, such as... Figure 1 As shown in the example, the positions of the first row of block protrusions 12 and strip protrusions 11 correspond one-to-one, the positions of the second row of block protrusions 12 and main channel 13 correspond one-to-one, and so on.

[0064] The shapes of the plurality of block protrusions 12 provided on the electrode plate 1 may be the same or different. In embodiments where the shapes of the plurality of block protrusions 12 provided on the electrode plate 1 are different, the plurality of block protrusions 12 may be a combination of polygonal block protrusions 12 and elliptical block protrusions 12, a combination of polygonal block protrusions 12 and circular block protrusions 12, a combination of elliptical block protrusions 12 and circular block protrusions 12, and a combination of circular block protrusions 12, polygonal block protrusions 12 and elliptical block protrusions 12. The plurality of block protrusions 12 are symmetrically distributed with respect to the length direction of the electrode plate 1.

[0065] In related technologies, bipolar plates are made of Q345 low-alloy high-strength steel, where Q represents the yield strength of the material and 345 represents the yield value of the material. In related technologies, after the bipolar plates with nipple structures are stamped, the springback deformation is large, the error of the bipolar plates with nipple structures is large, and the material has high hardness and low ductility, resulting in a large nipple spacing during stamping (a small nipple spacing during stamping will cause the bipolar plates to tear and break).

[0066] The bipolar plate 1 disclosed in this solution is made of stainless steel, optionally 316 stainless steel. 316 stainless steel has excellent mechanical properties, such as good corrosion resistance, tensile strength, and impact resistance. This solution replaces low-alloy high-strength steel with stainless steel. Stainless steel has good ductility, is easy to form, and has a small amount of springback deformation after stamping, which helps to improve precision and can reduce the distance between adjacent protrusions.

[0067] Stainless steel has the following advantages:

[0068] 1. Enhanced corrosion resistance: Stainless steel, especially austenitic stainless steel (such as 304, 316L, etc.), has excellent corrosion resistance and can resist the erosion of a variety of corrosive media, including acids, alkalis and salts in the electrolyte. In contrast, carbon steel is prone to corrosion in corrosive environments, which can lead to damage to the electrode surface, affecting electrolysis efficiency and equipment life.

[0069] Reduce corrosion products: Stainless steel plates can effectively reduce corrosion products generated during electrolysis. These products may contaminate the electrolyte, affect product quality, and increase the cost of subsequent treatment.

[0070] 2. Extended service life and higher durability: The corrosion resistance of stainless steel means that the electrode plates are not easily damaged during use and have greater durability, thereby extending the overall service life of the electrolytic cell, reducing maintenance and replacement due to corrosion, and lowering operating costs.

[0071] 3. Improved electrical energy efficiency, reduced resistance, and reduced heat loss: Stainless steel has better electrical conductivity than carbon steel, especially after surface treatment (such as polishing), which can further reduce resistance, reduce electrical energy loss, and improve electrolysis efficiency. Stainless steel has low thermal conductivity, which helps to reduce heat loss generated during electrolysis and maintain the stable operation of the electrolytic cell.

[0072] 4. Environmental friendliness. Reduced emissions of harmful substances and recyclability: Stainless steel plates are less likely to release harmful substances during electrolysis, making them more environmentally friendly; stainless steel is a recyclable material, which helps to achieve green design and circular economy of electrolytic cells.

[0073] The electrode plate 1 disclosed in this solution is made of more conventional materials, which has a high material utilization rate and helps to control material costs.

[0074] Auxiliary positioning holes 15 are provided at both ends of the electrode plate 1 along its length. The auxiliary positioning holes 15 cooperate with the bolts used to lock the square electrolytic cell to improve the assembly accuracy and ensure that the bipolar plate is installed flat.

[0075] The bipolar plate disclosed in this solution uses auxiliary positioning holes 15 to assist in the positioning and welding between the bipolar plates. The back sides of the two plates 1 are flat, corresponding to the positions of the main flow channel 13 and the diffuser flow channel 14. After the flat parts of the two plates 1 are attached, the flatness after welding is improved. In related technologies, bipolar plates with nipple structures are stamped first and then welded. The welding position is the outer circle of the nipple. The welding mating surface is small, and the welding positioning is inaccurate and prone to displacement.

[0076] This solution also discloses a square electrolytic cell, including a bipolar plate. The bipolar plate is the same as the bipolar plate described in any of the above solutions. Since the bipolar plate has the above-mentioned technical effects, the square electrolytic cell with the bipolar plate also has the same technical effects, which will not be elaborated here.

[0077] like Figure 9As shown, the square electrolytic cell includes a left end plate 2, a first insulating pad, a positive electrode conductive plate, an anode blind plate, a diaphragm, a bipolar plate, a negative electrode conductive plate, a second insulating pad, and a right end plate 3 arranged in sequence. The right end plate 3 includes a cathode chamber alkaline solution inlet 31, an anode chamber alkaline solution inlet 32, a cathode chamber alkaline solution outlet 33, and an anode chamber alkaline solution outlet 34. The cathode chamber alkaline solution inlet 31 and the anode chamber alkaline solution inlet 32 ​​are located at one end of the length direction of the right end plate 3, and the cathode chamber alkaline solution outlet 33 and the anode chamber alkaline solution outlet 34 are located at the other end of the length direction of the right end plate 3. The length direction of the right end plate 3 is consistent with the length direction of the electrode plate 1.

[0078] The square electrolytic cell disclosed in this solution is an atmospheric pressure electrolytic cell, which is safer than a circular electrolytic cell, reducing the risk of safety accidents caused by hydrogen leakage. Furthermore, the square electrolytic cell preferentially uses a composite diaphragm, which effectively prevents hydrogen-oxygen cross-contamination. Additionally, due to the lower pressure in the square electrolytic cell, the solubility of the gas in the electrolyte is reduced, resulting in higher purity of the produced gas. The current density of the square electrolytic cell is 8000 A / m. 2 In addition, it saves more space compared to a circular electrolytic cell.

[0079] The square electrolytic cell disclosed in this solution can achieve lower load operation, improve the safety of electrolytic cell operation and maintenance, and is easy to scale up. Low load operation of an electrolytic cell refers to operating the electrolytic cell below its design capacity or rated power. This state usually occurs when market demand declines, raw material supply is insufficient, or during equipment maintenance. Low load operation is not the optimal operating state for an electrolytic cell, but a reasonable low load operation strategy can help reduce energy consumption, extend equipment life, and optimize production costs.

[0080] This solution can enhance the uniformity of electrolyte flow, reduce the concentration difference of alkali solution on the electrode surface, and weaken the concentration polarization phenomenon that occurs during low-load operation, thereby ensuring that the equipment can operate efficiently under lower loads.

[0081] The square electrolytic cell adopts a modular design, which is easy to disassemble and install. When performing equipment maintenance, repair and replacement of parts, the operation is more convenient and faster, thereby reducing maintenance time and costs.

[0082] Enhancing the flow channel design of electrolyzers has multiple positive impacts on the scaling up of electrolyzers. These impacts are mainly reflected in improving electrolysis efficiency, optimizing electrolyte distribution, enhancing thermal management, and improving structural stability.

[0083] The following is a detailed analysis of these impacts:

[0084] 1. Optimized fluid dynamics to improve electrolysis efficiency: By enhancing the flow channel design, the flow path and velocity distribution of the electrolyte can be optimized, reducing dead zones and eddies, thereby improving the mixing efficiency and mass transfer rate of the electrolyte. This helps to accelerate the electrolysis reaction rate and improve electrolysis efficiency. Reduced pressure drop: A reasonable flow channel design can reduce the pressure loss of the electrolyte during the flow process, maintain a stable electrolyte flow rate, and ensure that all parts of the electrolytic cell receive a sufficient supply of electrolyte, thereby maintaining a highly efficient electrolysis process.

[0085] 2. Optimize electrolyte distribution for uniform distribution and reduce bubble interference: Enhanced flow channel design helps to achieve uniform distribution of electrolyte in the electrolytic cell, avoiding local over-concentration or over-dilute phenomena. This helps to maintain the consistency of reaction rate in all parts of the electrolytic cell and improve the quality and yield of electrolytic products.

[0086] Optimized flow channel design can reduce the retention and aggregation of bubbles in the electrolyte, reduce the interference of bubbles on the electrolyte flow, ensure that the electrolyte flows smoothly across the electrode surface, and improve electrolysis efficiency.

[0087] 3. Enhanced thermal management for effective heat dissipation and temperature uniformity: Large electrolytic cells generate a large amount of heat during operation. By enhancing the flow channel design, the electrolyte can be used more effectively as a cooling medium to carry away and dissipate the heat into the environment. This helps maintain the temperature stability inside the electrolytic cell and prevents equipment damage and efficiency reduction caused by overheating.

[0088] A well-designed flow channel helps achieve a uniform temperature distribution within the electrolytic cell, reducing localized overheating or undercooling. This helps maintain the stability of the electrolytic reaction rate and improves the purity and consistency of the electrolytic products.

[0089] 4. Improve structural stability, enhance support, and reduce vibration and noise: Enhanced flow channel design is usually accompanied by strengthening and optimizing the electrolytic cell structure. By increasing the flow channel wall thickness, using more robust materials, or optimizing the flow channel layout, the structural stability of the electrolytic cell can be enhanced, enabling it to withstand greater pressure and load, and meet the strength requirements of large-scale equipment.

[0090] A well-designed flow channel can also reduce vibration and noise generated during electrolyte flow, improving the stability and reliability of the electrolyzer's operation. This is especially important for large electrolyzers, as the cumulative effect of vibration and noise can have an adverse impact on the long-term operation of the equipment.

[0091] In conclusion, enhanced flow channel design has a significant positive impact on the scaling up of electrolyzers. Improvements in areas such as optimizing fluid dynamics, electrolyte distribution, thermal management, and structural stability can significantly increase electrolysis efficiency, improve the quality and yield of electrolytic products, reduce operating costs, and extend equipment lifespan. These advantages make enhanced flow channel design a key factor driving the scaling up of electrolyzers.

[0092] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A bipolar plate, characterized in that, It includes two electrode plates (1), the thickness of which is 0.3mm-0.5mm. The electrode plate (1) is stamped with strip-shaped protrusions (11) and block-shaped protrusions (12). The length direction of the strip-shaped protrusions (11) is consistent with the length direction of the electrode plate (1). A main channel (13) is formed between two adjacent strip-shaped protrusions (11). The block-shaped protrusions (12) are symmetrically arranged at both ends of the length direction of the strip-shaped protrusions (11). A diffusion channel (14) is formed between two adjacent block-shaped protrusions (12). The back sides of the two electrode plates (1) are attached to each other, and the two bipolar plates are welded together at the positions corresponding to the main channel (13) and the diffusion channel (14). The back side of the electrode plate (1) is the opposite side where the strip-shaped protrusions (11) and the block-shaped protrusions (12) are formed on the electrode plate (1).

2. The bipolar plate according to claim 1, characterized in that, The cross-section of the strip protrusion (11) is at least one of a rectangle, a triangle, a trapezoid, and a semicircle.

3. The bipolar plate according to claim 1, characterized in that, The cross section of the strip protrusion (11) along its length direction is at least one of V-shaped, wavy, and trapezoidal.

4. The bipolar plate according to any one of claims 1-3, characterized in that, The cross-section of the block protrusion (12) along the plane of the electrode plate (1) is at least one of polygonal, elliptical and circular.

5. The bipolar plate according to claim 4, characterized in that, Multiple rows of block protrusions (12) are arranged along the length direction of the strip protrusion (11). Each row of block protrusions (12) corresponds to the position of the strip protrusion (11) or corresponds to the position of the main channel (13). The straight line where each row of block protrusions (12) is located is perpendicular to the length direction of the strip protrusion (11).

6. The bipolar plate according to claim 5, characterized in that, The block protrusions (12) in adjacent rows are misaligned.

7. The bipolar plate according to claim 1, characterized in that, The electrode plate (1) has auxiliary positioning holes (15) at both ends along its length.

8. The bipolar plate according to claim 1, characterized in that, The electrode plate (1) is a stainless steel plate.

9. A square electrolytic cell, characterized in that, It includes a left end plate (2), a first insulating pad, a positive conductive plate, an anode blind plate, a diaphragm, a bipolar plate, a negative conductive plate, a second insulating pad, and a right end plate (3) arranged in sequence, wherein the bipolar plate is the bipolar plate according to any one of claims 1-8.

10. The square electrolytic cell according to claim 9, characterized in that, The diaphragm is a PPS cloth or a composite diaphragm.

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