A concave-convex electrode plate, a filter press electrolytic cell unit, and a filter press electrolytic cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-01
- Publication Date
- 2026-08-14
AI Technical Summary
然而，现有技术中，碱性电解槽极板凹凸单元结构极板上碱液流场均匀性差，在靠近边壁区域存在明显的流动死区，使得电解能耗增加
本发明通过导流孔流通面积梯度分配与凹凸单元协同作用，有效改善了极板上的碱液浓度分布，使流道更顺畅，显著提升了电解液横向铺展均匀性与气泡脱除效率，从而降低极板的接触电阻，提高电流密度，降低电解能耗，克服了传统极板进口射流集中、两侧滞流以及板内气含率分布不均的问题，可应用于碱性水电解制氢等电化学反应装置，有效降低单位氢气产量的电耗。
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Figure CN122564587A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of water electrolysis hydrogen production equipment, and relates to a concave-convex electrode plate, a pressure filter electrolyzer unit, and a pressure filter electrolyzer. Background Technology
[0002] The filter press electrolyzer is a commonly used alkaline water electrolyzer (AWE). The cell body consists of multiple electrolysis units stacked in a specific pattern. This type of electrolyzer has advantages such as low cost, compact structure, and simple gas-liquid circulation channel structure, and is widely used in various industries for hydrogen or oxygen supply. The flow channel structure of the filter press electrolyzer directly affects the distribution of the alkaline solution during electrolysis, thus influencing the bubble generation rate, gas-liquid two-phase transport, and temperature distribution within the flow channel. In industrial processes, concave and convex spherical structures are widely used due to their simple stamping, strong pressure resistance, and low flow loss. However, in existing technologies, the alkaline solution flow field uniformity on the electrode plates of alkaline electrolyzers with concave-convex unit structures is poor, with obvious flow dead zones near the sidewalls, leading to increased electrolysis energy consumption. Existing pressure filter electrolyzers (especially industrial-scale AWEs) generally use a single electrolyte inlet to introduce electrolyte from the edge or center of the electrode plate. The electrolyte is prone to problems such as inlet jet impact, expansion of the stagnation zone on both sides, and uneven gas holdup distribution in the electrode plate flow field, resulting in a decrease in the effective reaction area utilization rate, uneven local current density, and limited electrolysis efficiency.
[0003] Therefore, in order to save energy and ensure the normal operation of the electrolyzer, it is necessary to design a new flow field structure for the flow channel. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the present invention aims to provide a concave-convex electrode plate, a pressure filter electrolytic cell unit, and a pressure filter electrolytic cell. The present invention overcomes the inherent defect of "more flow in the middle and less flow on the sides" in the inlet jet by setting a flow-guiding section on the surface of the concave-convex electrode plate near the electrolyte inlet, and by using a gradient distribution of the flow area to ensure uniform lateral spread of the electrolyte. Simultaneously, the liquid distribution area employs alternating hemispherical concave-convex units to synergistically enhance gas-liquid disturbance and bubble removal, significantly improving the lateral spread uniformity of the electrolyte and the efficiency of bubble removal. This effectively improves the alkaline concentration distribution on the electrode plate, making the flow channel smoother, thereby reducing contact resistance and increasing current density.
[0005] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a concave-convex electrode plate for a pressure filter electrolyzer, wherein the concave-convex electrode plate has an electrolyte inlet, a liquid distribution area is provided on the surface of the concave-convex electrode plate, a flow guiding section is provided in the liquid distribution area, and the flow guiding section is located close to the electrolyte inlet and communicates with the electrolyte inlet; The flow guiding section includes a transverse flow guiding part and two side parts located at both ends thereto. The transverse flow guiding part is arranged parallel to the inner edge of the concave and convex electrode plate, and the end of the side part away from the transverse flow guiding part is connected to the inner edge of the concave and convex electrode plate. The transverse guide section has multiple guide holes, and the flow area of the guide holes increases from the center line of the electrolyte inlet towards both sides of the flow field.
[0006] In this invention, by adding a flow-guiding section at the electrolyte inlet and opening a certain number of flow-guiding holes on the flow-guiding section, the lateral distribution of the electrolyte can be enhanced, the flow dead zone can be reduced, the alkaline concentration distribution on the electrode plate can be effectively improved, and the flow channel can be smoother, thereby reducing contact resistance and increasing current density. It is important to emphasize that the flow area of the flow-guiding holes must increase gradually from the center line of the electrolyte inlet towards both sides of the flow field. If all flow-guiding holes are the same size, due to pressure loss along the flow path, the flow rate near the inlet will be larger, while that at the far end will be smaller, resulting in uneven electrolyte distribution. Therefore, the opening of the flow-guiding holes needs to gradually increase from the near end (close to the electrolyte inlet) to the far end to compensate for the pressure drop, thereby making the flow rate of each flow-guiding hole more uniform.
[0007] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The technical objectives and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.
[0008] Preferably, the flow guiding section is axially symmetrical about the centerline of the electrolyte inlet.
[0009] Preferably, the arc length of the transverse guide portion is 5% to 25% of the circumference of the concave-convex electrode plate, such as 5%, 8%, 10%, 12%, 15%, 18%, 20%, or 25%.
[0010] Preferably, the distance between the transverse guide portion and the inner edge of the concave-convex electrode plate is 1% to 5% of the diameter of the concave-convex electrode plate, for example, 1%, 2%, 3%, 4% or 5%.
[0011] In this invention, by controlling the arc length of the lateral guide section and its distance from the inner edge of the concave and convex electrode plate within the above-mentioned preferred range, it is more beneficial to make the guide section cover the main jet area near the electrolyte inlet, while avoiding the guide section from excessively occupying the reaction flow field area, thereby improving the lateral spreading uniformity of the electrolyte and reducing the edge flow dead zone.
[0012] Preferably, the center distance between any two adjacent guide holes is equal.
[0013] Preferably, the center distance is 10mm to 80mm, such as 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm or 80mm.
[0014] Preferably, the guide holes are symmetrically distributed on both sides of the center line of the electrolyte inlet, and no guide holes are provided at the position of the transverse guide portion directly opposite the electrolyte inlet.
[0015] Preferably, the number of the guide holes is ≥6.
[0016] Preferably, the flow area of the electrolyte inlet is denoted as S, and the flow areas of the guide holes along the flow field directions to both sides of the electrolyte inlet are 0.3S~2S respectively.
[0017] For example, a total of 6 guide holes are provided and symmetrically distributed on both sides of the center line of the electrolyte inlet. The flow area of the guide holes from the center line of the electrolyte inlet to the flow field on both sides is 0.5S, S and 1.5S respectively.
[0018] Preferably, the guide hole is rectangular in shape.
[0019] Preferably, the material of the guide section includes stainless steel.
[0020] Preferably, the liquid distribution area has multiple concave units and multiple convex units alternately distributed.
[0021] Preferably, the concave unit and the convex unit are each independently hemispherical in shape.
[0022] Preferably, the diameter of the concave unit and the convex unit is independently 5mm to 30mm, for example, 5mm, 10mm, 15mm, 20mm, 25mm or 30mm.
[0023] Preferably, the total projected area of the plurality of concave units and the plurality of convex units on the surface of the liquid distribution area is each independently 20% to 70% of the area of the liquid distribution area.
[0024] Preferably, the depth of the concave unit and the height of the convex unit are each independently 1mm to 8mm, for example 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm.
[0025] Preferably, the distance between two adjacent concave units and the distance between two adjacent convex units are each independently 2.5mm to 20mm, such as 2.5mm, 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm or 20mm.
[0026] Preferably, the plurality of concave units and the plurality of convex units are arranged in an alternating row and column array within the liquid distribution area, and the ratio of the plurality of concave units to the plurality of convex units is 1:(0.9~1.1), for example 1:0.9, 1:1 or 1:1.1, etc.
[0027] In a second aspect, the present invention provides a pressure filter electrolytic cell unit, the pressure filter electrolytic cell unit comprising: The pole frame has a cavity; A diaphragm is disposed within the cavity and divides the cavity into two sub-chambers; A pair of electrodes, wherein the pair of electrodes are located within the cavity and are respectively disposed on both sides of the diaphragm; A pair of concave and convex electrode plates as described in the first aspect, wherein the pair of concave and convex electrode plates are respectively disposed on both sides of the pair of electrodes and fixedly connected to the openings at both ends of the electrode frame.
[0028] Thirdly, the present invention provides a pressure filter electrolyzer, which includes a plurality of pressure filter electrolyzer units as described in the second aspect, stacked sequentially.
[0029] The numerical range described in this invention includes not only the point values listed above, but also any point values within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values included in the range.
[0030] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively improves the alkaline concentration distribution on the electrode plate through the gradient distribution of the flow area of the guide hole and the synergistic effect of the concave and convex units, making the flow channel smoother and significantly improving the lateral spreading uniformity of the electrolyte and the efficiency of bubble removal. This reduces the contact resistance of the electrode plate, increases the current density, and reduces the energy consumption of electrolysis. It overcomes the problems of concentrated inlet jet, stagnant flow on both sides, and uneven gas content distribution within the plate in traditional electrode plates. It can be applied to electrochemical reaction devices such as alkaline water electrolysis for hydrogen production, effectively reducing the power consumption per unit of hydrogen production. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the structure of the pressure filter electrolytic cell unit provided in Example 1.
[0032] Figure 2 This is a schematic diagram of the planar structure of the concave-convex electrode plate provided in Embodiment 1.
[0033] Figure 3 This is a three-dimensional structural schematic diagram of the concave-convex electrode plate provided in Example 1.
[0034] Figure 4 This is a comparison diagram of the simulated flow field velocity lines of the concave and convex plates provided in Example 1 and Comparative Example 1.
[0035] Figure 5 This is a comparison diagram of the simulated flow field velocity cloud map of the concave and convex plates provided in Example 1 and Comparative Example 1.
[0036] In the figure: 1-Electrode; 2-Electrode plate; 3-Diaphragm; 4-Electrode frame; 5-Concave unit; 6-Convex unit; 7-Screw hole; 8.1-Electrolyte inlet; 8.2-Electrolyte outlet; 9-Guide section; 9.1-Guide hole 1; 9.2-Guide hole 2; 9.3-Guide hole 3. Detailed Implementation
[0037] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.
[0038] The "range" disclosed in this invention can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. This type of range definition can include or exclude endpoints; any endpoint can be independently included or excluded, and they can be arbitrarily combined, meaning any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for specific parameters, it is understood that ranges of 60~110 and 80~120 are also expected. Furthermore, if minimum range values 1 and 2 are listed, and maximum range values 3, 4, and 5 are also listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0" and "5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to listing integers such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For instance, when a parameter is described as an integer selected from "2~10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.
[0039] In this invention, "a combination of at least two" refers to a quantity greater than or equal to two, unless otherwise specified. For example, "any combination of one or at least two" means one or more or more items. It can be understood that when referring to "a combination of at least two," it refers to any suitable combination of multiple items, that is, a combination of "at least two" items carried out in a manner that does not conflict with and enables the implementation of this invention.
[0040] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.
[0041] The term "embodiment" as used in this invention means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment or implementation of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.
[0042] In this invention, open-ended technical features or solutions described using terms such as "comprising" do not exclude additional members beyond those listed unless otherwise specified. They can be considered as providing both closed-ended features or solutions comprised of the listed members and open-ended features or solutions that include additional members beyond the listed members. For example, A includes a1, a2, and a3. Unless otherwise specified, it may also include other members or exclude additional members. This can be considered as providing both technical features or solutions where "A is composed of a1, a2, and a3" or "A is selected from a1, a2, and a3," and technical features or solutions where "A includes not only a1, a2, and a3, but also other members."
[0043] In this invention, unless otherwise specified, the features or solutions corresponding to "and / or" include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "A and / or B" represents a group consisting of A, B, and "a combination of A and B". "Containing A and / or B" can mean "containing A, containing B, and containing A and B", or "containing A, containing B, or containing A and B", and can be appropriately understood according to the context.
[0044] In this invention, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on the quantity.
[0045] In this invention, "optional" means that something is optional, that is, it refers to either "with" or "without". If there are multiple "optional" options in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, then each "optional" option is independent.
[0046] In this invention, "room temperature" generally refers to 4℃~35℃, and can refer to 20℃±5℃. In some embodiments of this invention, room temperature refers to 20℃~30℃.
[0047] Example 1 This embodiment provides a pressure filter electrolytic cell unit, such as... Figure 1 As shown, it includes: an electrode frame 4, a diaphragm 3 disposed in the cavity of the electrode frame 4 and dividing the cavity into two sub-chambers, electrodes 1 located on both sides of the diaphragm, and a pair of concave and convex electrode plates 2 disposed on both sides of the pair of electrodes 1 and fixedly connected to the openings at both ends of the electrode frame 4 through screw holes 7.
[0048] The structure of the concave-convex electrode 2 is as follows Figure 2 and Figure 3 As shown, the system includes an electrolyte inlet 8.1 and an outlet 8.2, and a flow guide section 9 located within the liquid distribution area and close to the electrolyte inlet 8.1. The flow guide section 9 includes a transverse flow guide portion and two side portions at its ends. The transverse flow guide portion is parallel to the inner edge of the concave-convex electrode plate, with an arc length of 15% of the circumference of the concave-convex electrode plate (1194 mm) and a distance to the inner edge of the concave-convex electrode plate of 3% of the diameter of the concave-convex electrode plate (380 mm). The side portions, away from the transverse flow guide portion, are connected to the inner edge of the concave-convex electrode plate. The transverse flow guide portion is symmetrical about the centerline of the electrolyte inlet 8.1 and is made of stainless steel. The transverse flow guide portion has six rectangular flow guide holes symmetrically distributed on both sides of the centerline of the electrolyte inlet 8.1 (e.g., 9.1, 9.2, and 9.3 on the left). The flow area from the centerline of the electrolyte inlet outwards towards both sides is the electrolyte inlet flow area (75 mm²). 2 The projected area is 0.5 times, 1 times, and 1.5 times that of the liquid distribution area, and the center distance between adjacent guide holes is 30 mm. In addition, multiple hemispherical concave units 5 and convex units 6 are alternately distributed in the liquid distribution area, with a total projected area of 113411 mm². 2 50% of the sphere, with a diameter of 15mm, a depth or height of 7.5mm, a center distance of 15mm between two adjacent concave elements and a center distance of 15mm between two adjacent convex elements, and a ratio of 1:1 between the number of concave elements and convex elements.
[0049] Example 2 This embodiment provides a pressure filter electrolytic cell unit, including: an electrode frame, a diaphragm disposed in the cavity of the electrode frame and dividing the cavity into two sub-chambers, electrodes located on both sides of the diaphragm, and a pair of concave and convex electrode plates disposed on both sides of a pair of electrodes and fixedly connected to the openings at both ends of the electrode frame through screw holes.
[0050] The concave-convex electrode plate includes an electrolyte inlet and an outlet, and a flow guide section disposed within the liquid distribution area and close to the electrolyte inlet. The flow guide section includes a transverse flow guide portion and two side portions at its ends. The transverse flow guide portion is parallel to the inner edge of the concave-convex electrode plate, with an arc length of 5% of the perimeter of the concave-convex electrode plate (1194 mm) and a distance to the inner edge of the concave-convex electrode plate of 5% of the diameter of the concave-convex electrode plate (380 mm). The side portions, away from the transverse flow guide portion, are connected to the inner edge of the concave-convex electrode plate. The transverse flow guide portion is symmetrical about the centerline of the electrolyte inlet and is made of stainless steel. The transverse flow guide portion has six rectangular flow guide holes symmetrically distributed on both sides of the centerline of the electrolyte inlet. The flow area from the centerline of the electrolyte inlet outwards towards both sides is approximately equal to the electrolyte inlet flow area (75 mm²). 2 The projected area is 0.3, 0.4, and 0.5 times that of the liquid distribution area, and the center distance between adjacent guide holes is 10 mm. In addition, the liquid distribution area is alternately distributed with multiple hemispherical concave and convex units, with a total projected area of 113411 mm². 2 The sphere is 20% of the total sphere, with a diameter of 5 mm and a depth or height of 1 mm. The distance between two adjacent concave units and the distance between two adjacent convex units are both 2.5 mm. The ratio of the number of concave units to the number of convex units is 1:0.9.
[0051] Example 3 This embodiment provides a pressure filter electrolytic cell unit, including: an electrode frame, a diaphragm disposed in the cavity of the electrode frame and dividing the cavity into two sub-chambers, electrodes located on both sides of the diaphragm, and a pair of concave and convex electrode plates disposed on both sides of a pair of electrodes and fixedly connected to the openings at both ends of the electrode frame through screw holes.
[0052] The concave-convex electrode plate includes an electrolyte inlet and an outlet, and a flow guide section disposed within the liquid distribution area and close to the electrolyte inlet. The flow guide section includes a transverse flow guide portion and two side portions at its ends. The transverse flow guide portion is parallel to the inner edge of the concave-convex electrode plate, with an arc length of 25% of the plate's circumference (1194 mm) and a distance to the inner edge of the plate equal to 1% of its diameter (380 mm). The side portions, away from the transverse flow guide portion, connect to the inner edge of the plate. The transverse flow guide portion is symmetrical about the centerline of the electrolyte inlet and is made of stainless steel. The transverse flow guide portion has eight rectangular flow holes symmetrically distributed on both sides of the electrolyte inlet centerline. The flow area from the centerline of the electrolyte inlet outwards is approximately equal to the electrolyte inlet flow area (75 mm²) on each side. 2 The projected area is 0.5 times, 1 times, 1.5 times, and 2 times that of the liquid distribution area, with a center distance of 37 mm between adjacent guide holes. Furthermore, the liquid distribution area is alternately distributed with multiple hemispherical concave and convex units, with a total projected area of 113411 mm². 2The sphere is 70% of the total sphere, with a diameter of 30 mm and a depth or height of 8 mm. The distance between two adjacent concave units and the distance between two adjacent convex units are both 20 mm. The ratio of the number of concave units to the number of convex units is 1:1.1.
[0053] Example 4 The difference between this embodiment and embodiment 1 is that there are a total of 4 guide holes, which are symmetrically distributed on both sides of the center line of the electrolyte inlet. The flow area from the center line of the electrolyte inlet to both sides of the flow field direction is 1 times and 2 times the electrolyte inlet area, respectively, and the center distance between adjacent guide holes is equal. The remaining preparation methods and parameters are consistent with those in Example 1.
[0054] Example 5 The difference between this embodiment and Embodiment 1 is that the flow area of the guide hole is 0.2 times, 1.3 times, and 2.5 times the electrolyte inlet area from the center line of the electrolyte inlet to both sides of the flow field direction; The remaining preparation methods and parameters are consistent with those in Example 1.
[0055] Example 6 The difference between this embodiment and Embodiment 1 is that the distance from the lateral guide portion to the inner edge of the concave-convex electrode plate is 8% of the diameter of the concave-convex electrode plate; The remaining preparation methods and parameters are consistent with those in Example 1.
[0056] Comparative Example 1 The difference between this comparative example and Example 1 is that the guide section 9 is not provided; The remaining preparation methods and parameters are consistent with those in Example 1.
[0057] Comparative Example 2 The difference between this comparative example and Example 1 is that the flow area of each of the six guide holes is the same as the flow area of the electrolyte inlet. The remaining preparation methods and parameters are consistent with those in Example 1.
[0058] Flow field simulation Computational fluid dynamics (CFD) was used to numerically simulate the electrolyte flow characteristics on the surface of the concave and convex plates in Examples 1-6 and Comparative Examples 1-2, and the flow field velocity distribution was obtained.
[0059] By comparison Figure 4 and Figure 5As can be seen from the velocity distribution, compared with Comparative Example 1, the velocity at the center of Example 1 is significantly reduced, from 5.99 mm / s to 1.34 mm / s, a decrease of 77.6%. Furthermore, the axial velocity fluctuation is significantly weakened, and the velocity non-uniformity coefficient decreases from 1.28 to 0.83, greatly improving the overall uniformity. Therefore, compared with traditional uneven electrode plates, this invention, by setting a flow guiding section in the electrolyte inlet area and utilizing fluid momentum to cover a larger area, significantly improves the overall uniformity of electrolyte flow on the electrode plate, thereby reducing electrolysis energy consumption.
[0060] Meanwhile, although the non-uniformity coefficient of Comparative Example 2 is slightly lower than that of Comparative Example 1, it is still larger than that of Example 1. This indicates that the flow area of the guide holes must increase from the center line of the electrolyte inlet towards both sides of the flow field. If all guide holes are the same size, due to pressure loss along the flow path, the outflow from guide holes near the inlet will be larger, while that from the far end will be smaller, resulting in uneven electrolyte distribution.
[0061] Furthermore, the data results of Examples 4-6 show that the number of guide holes, the area of the guide holes, and the distance between the guide section and the inner edge of the electrode plate also affect the uniformity of the flow field. By controlling them within the preferred range of the present invention, the uniformity of electrolyte flow within the electrode plate can be further improved.
[0062] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.
Claims
1. A concave-convex electrode plate for a pressure filter electrolytic cell, characterized in that, The concave-convex electrode plate has an electrolyte inlet, and a liquid distribution area is provided on the surface of the concave-convex electrode plate. A flow guiding section is provided in the liquid distribution area, and the flow guiding section is located close to the electrolyte inlet and communicates with the electrolyte inlet. The flow guiding section includes a transverse flow guiding part and two side parts located at both ends thereto. The transverse flow guiding part is arranged parallel to the inner edge of the concave and convex electrode plate, and the end of the side part away from the transverse flow guiding part is connected to the inner edge of the concave and convex electrode plate. The transverse guide section has multiple guide holes, and the flow area of the guide holes increases from the center line of the electrolyte inlet towards both sides of the flow field.
2. The concave-convex electrode plate according to claim 1, characterized in that, The flow guide section is symmetrical about the centerline of the electrolyte inlet.
3. The concave-convex electrode plate according to claim 1 or 2, characterized in that, The arc length of the lateral guide portion is 5% to 25% of the circumference of the concave-convex electrode plate.
4. The concave-convex electrode plate according to any one of claims 1-3, characterized in that, The distance between the lateral guide portion and the inner edge of the concave-convex electrode plate is 1% to 5% of the diameter of the concave-convex electrode plate.
5. The concave-convex electrode plate according to any one of claims 1-4, characterized in that, The center distance between any two adjacent guide holes is equal; Preferably, the center distance is 10mm to 80mm.
6. The concave-convex electrode plate according to any one of claims 1-5, characterized in that, The flow guide holes are symmetrically distributed on both sides of the center line of the electrolyte inlet, and no flow guide holes are provided at the position of the transverse flow guide section directly opposite the electrolyte inlet; Preferably, the number of the guide holes is ≥6; Preferably, the flow area of the electrolyte inlet is denoted as S, and the flow areas of the guide holes along the flow field directions to both sides of the electrolyte inlet are 0.3S~2S respectively.
7. The concave-convex electrode plate according to any one of claims 1-6, characterized in that, The guide hole is rectangular in shape; Preferably, the material of the guide section includes stainless steel.
8. The concave-convex electrode plate according to any one of claims 1-7, characterized in that, The liquid distribution region is alternately distributed with multiple concave units and multiple convex units; Preferably, the concave unit and the convex unit are each independently hemispherical in shape; Preferably, the diameter of the concave unit and the convex unit is independently 5mm to 30mm; Preferably, the sum of the projected areas of the plurality of concave units and the plurality of convex units on the surface of the liquid distribution area is 20% to 70% of the area of the liquid distribution area; Preferably, the depth of the concave unit and the height of the convex unit are each independently 1mm to 8mm; Preferably, the distance between two adjacent concave units and the distance between two adjacent convex units are each independently 2.5mm to 20mm; Preferably, the plurality of concave units and the plurality of convex units are arranged in an alternating row and column array within the liquid distribution area, and the ratio of the plurality of concave units to the plurality of convex units is 1:(0.9~1.1).
9. A pressure filter electrolytic cell unit, characterized in that, The pressure filter electrolyzer unit includes: The pole frame has a cavity; A diaphragm is disposed within the cavity and divides the cavity into two sub-chambers; A pair of electrodes, wherein the pair of electrodes are located within the cavity and are respectively disposed on both sides of the diaphragm; A pair of concave-convex electrode plates as described in any one of claims 1-8, wherein the pair of concave-convex electrode plates are respectively disposed on both sides of the pair of electrodes and fixedly connected to the openings at both ends of the electrode frame.
10. A pressure filter electrolytic cell, characterized in that, The pressure filter electrolyzer includes a plurality of pressure filter electrolyzer units as described in claim 9, which are stacked sequentially.