Bionic vein type PEM electrolytic cell polar plate and method

Abstract

The invention provides a bionic vein type PEM electrolytic cell pole plate and a method, and relates to the technical field of PEM water electrolysis hydrogen production, the electrolytic cell pole plate comprises a pole plate, a main vein channel, a side vein channel, a capillary vein channel, a water inlet pipe and a water outlet pipe, through smooth transition of the main vein channel, the side vein channel and the capillary vein channel and a graded transmission structure design, the water inlet pipe and the water outlet pipe are communicated, and the water inlet pipe and the water outlet pipe are communicated. The main pulse channel bears main fluid conveying, the side pulse channel achieves secondary shunting, the capillary pulse channel extends to the whole area of the electrode plate, the effective area utilization rate is larger than or equal to 95%, the fluid movement rule is adapted in principle, steering resistance and eddy-current loss are reduced, and the effective area utilization rate is improved. Meanwhile, the maximum static pressure loss is reduced by more than 40% compared with that of a traditional snake-shaped flow channel through the bionic hierarchical structure, the purpose of low resistance is achieved, the flow velocity distribution of fluid in the closed flow channel oppositely formed in the paired polar plates is uniform, and the technical problems that an existing flow channel structure is large in flow channel resistance, poor in mass transfer uniformity and low in effective area utilization rate are solved.

Description

Technical Field

[0001] This invention relates to the field of PEM electrolysis for hydrogen production technology, specifically to a biomimetic leaf vein-type PEM electrolysis cell electrode plate and method. Background Technology

[0002] PEM water electrolysis hydrogen production technology has become a core technology for hydrogen energy production due to its fast start-up speed, high current density, and high product purity. As a key channel for electrolyte mass transfer, the bipolar plate flow channel's structural design directly determines the energy consumption and efficiency of the electrolyzer. If the flow channel resistance is too high, it will increase the operating cost of the pump. Uneven mass transfer will cause local concentration polarization, leading to a decrease in electrolysis efficiency.

[0003] In existing technologies, the bipolar plate flow channels of PEM electrolyzers mostly adopt parallel flow channels, serpentine flow channels, or simple branched flow channels. (See the attached instruction manual.) Figure 5 The diagram shows a schematic of the parallel flow channel structure in the prior art, as well as the appendix to the instruction manual. Figure 6 The image shows a simulation diagram of a parallel flow channel in the prior art. Although this type of flow channel design is easy to manufacture, it has inherent defects, including: a fundamental flaw in resistance principle: traditional parallel serpentine flow channels rely on bends to cover the electrode plates, and eddies easily form at the bends, leading to significant pressure loss; simple branch flow channels lack a smooth transition between the main vein and side veins, increasing energy consumption when the fluid turns; poor mass transfer uniformity: the flow velocity in parallel flow channels decreases along the path, resulting in insufficient fluid supply in the edge regions; uneven flow distribution in the side veins of simple branch flow channels easily leads to local "dead water areas," causing concentration polarization; and low effective area utilization: to avoid excessive resistance, traditional flow channels need to reserve blank areas to reduce bends, resulting in the electrode plate edges not being covered, and the effective reaction area utilization is only 60%-70%. To solve these problems, some existing solutions attempt to optimize the flow channel size, but lack an essential adaptation to the "fluid motion law," failing to reduce resistance and improve uniformity from a structural principle perspective. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a biomimetic leaf vein type PEM electrolytic cell electrode plate and method.

[0005] A biomimetic leaf vein-type PEM electrolytic cell electrode plate includes: an electrode plate, wherein the electrode plates are arranged in pairs, and the electrode plate is provided with a biomimetic leaf vein-type flow channel structure. The biomimetic leaf vein-type flow channel structure is a symmetrical structure, including a main vein channel, a side vein channel and a capillary vein channel. The main vein channel runs through the electrode plate. One end of the electrode plate is provided with a water inlet pipe, and the other end of the electrode plate is provided with a water outlet pipe. Both the water inlet pipe and the water outlet pipe are connected to the main vein channel. The side vein channel is connected to the main vein channel, and the capillary vein channel is connected to the side vein channel.

[0006] Furthermore, the angle D between the lateral vein channel and the main vein channel near one end of the water inlet pipe is 55 degrees.

[0007] Furthermore, the capillary channel includes an upper capillary channel, a lower capillary channel, and a terminal capillary channel. The upper capillary channel is located on one side of the lateral vein channel, the lower capillary channel is located on the other side of the lateral vein channel, and the terminal capillary channel is located at the end of the lateral vein channel away from the main vein channel.

[0008] Furthermore, the connection between the lateral vein channel and the main vein channel has a rounded transition structure.

[0009] Furthermore, a flow divider is also provided on the electrode plate, and the flow dividers are arranged in pairs at the center of the main pulse channel.

[0010] Furthermore, the width at both ends of the splitter plate is smaller than the width at the center of the splitter plate.

[0011] Furthermore, the width at both ends of the main vein channel is greater than the width at the center of the main vein channel.

[0012] Furthermore, both the upper and lower capillary channels are arranged in multiple parallel lines along the lateral vein channels.

[0013] Furthermore, the angle M between the upper capillary channel and the lateral vein channel is 16 degrees, and the angle N between the lower capillary channel and the lateral vein channel is 68 degrees.

[0014] The present invention also includes a method for transporting electrolyzed water fluid, which is based on a biomimetic leaf vein type PEM electrolytic cell electrode plate as described in any of the above claims. Fluid is input through an inlet pipe, transported through the main vein channel, and diverted through the side vein channel. The fluid flows into the side vein channel and simultaneously flows to the outlet pipe. The fluid entering the side vein channel flows into the capillary channel and then flows to the outlet pipe from the capillary channel.

[0015] The technical solution of this invention has the following advantages: The technical solution provided by this invention, through the smooth transition and hierarchical transmission structure design of the main channel, side channel and capillary channel, enables the main channel to carry the main fluid, the side channel to achieve secondary diversion, and the capillary channel to extend to the entire area of ​​the electrode plate, with an effective area utilization rate of ≥95%. In principle, it adapts to the fluid motion law, reduces turning resistance and eddy current loss, and improves the effective area utilization rate. At the same time, the biomimetic hierarchical structure reduces the maximum static pressure loss by more than 40% compared with the traditional serpentine flow channel, achieving the purpose of low resistance. The fluid velocity distribution in the closed flow channel formed by the pairs of electrode plates is uniform, with no local "dead water area", and the electrolysis efficiency is improved by 12%-15%. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the main vein channel and lateral vein channel of the present invention; Figure 3 This is a schematic diagram of the capillary channel and flow divider of the present invention; Figure 4 This is a schematic diagram of the upper capillary channel, lower capillary channel, and terminal capillary channel of the present invention. Figure 5 This is a schematic diagram of the structure of a parallel flow channel in the prior art; Figure 6 This is a simulation diagram of a parallel flow channel in the prior art.

[0018] Explanation of reference numerals in the attached figures: 1-Electrode plate; 2-Inlet pipe; 3-Outlet pipe; 4-Positioning mounting hole; 5-Main vein channel; 6-Side vein channel; 7-Capillary vein channel; 701-Upper capillary vein channel; 702-Lower capillary vein channel; 703-End capillary vein channel; 8-Diverter plate. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figures 1-4 The diagram shows a biomimetic leaf vein-type PEM electrolytic cell electrode plate, comprising: electrode plate 1, wherein the electrode plates 1 are arranged in pairs, and the electrode plate 1 is provided with a biomimetic leaf vein-type flow channel structure. The biomimetic leaf vein-type flow channel structure is a symmetrical structure, that is, each flow channel is symmetrical in both the transverse and longitudinal directions. The biomimetic leaf vein-type flow channel structure includes a main vein channel 5, a side vein channel 6, and a capillary vein channel 7. The main vein channel 5 runs through the electrode plate 1. One end of the electrode plate 1 is integrally formed with a water inlet pipe 2, and the other end of the electrode plate 1 is integrally formed with a water outlet pipe 3. Both the water inlet pipe 2 and the water outlet pipe 3 are connected to the main vein channel 5. The cross-sectional diameter of both the water inlet pipe 2 and the water outlet pipe 3 is 5.5 mm. The side vein channel 6 is connected to the main vein channel 5, and the capillary vein channel 7 is connected to the side vein channel 6. Each flow channel structure can be processed by existing laser engraving technology. Two electrode plates 1 are spliced ​​together, and positioning mounting holes 4 are opened at the four corners of the electrode plate 1. The diameter of the positioning mounting holes 4 is 3mm. When assembling the bipolar plates 1, the flow channels are aligned, and the two electrode plates 1 are assembled by connecting the positioning mounting holes 4 with M3 screws to form a closed flow channel space. Each electrode plate 1 is 100mm long, 50mm wide, and 3mm thick. The main vein channel 5 is set longitudinally along the center of the electrode plate 1. The width of the main vein channel 5 is 5mm and the depth is 2mm.

[0024] The aforementioned biomimetic leaf vein-type PEM electrolytic cell electrode plate, through the smooth transition and hierarchical transmission structure design of the main vein channel 5, side vein channel 6, and capillary vein channel 7, enables the main vein channel 5 to carry the main fluid, the side vein channel 6 to achieve secondary flow diversion, and the capillary vein channel 7 to extend to the entire area of ​​the electrode plate 1, with an effective area utilization rate of ≥95%. In principle, it adapts to the fluid motion law, reduces turning resistance and eddy current loss, and improves the effective area utilization rate. At the same time, the biomimetic hierarchical structure reduces the maximum static pressure loss by more than 40% compared with the traditional serpentine flow channel, achieving the purpose of low resistance. The fluid velocity distribution in the relatively closed flow channel formed by the paired electrode plates 1 is uniform, with no local "dead water area", and the electrolysis efficiency is improved by 12%-15%.

[0025] like Figures 1-4 As shown, in this embodiment, the angle D between the side vein channel 6 near the end of the inlet pipe 2 and the main vein channel 5 is 55 degrees. The side vein channels 6 on each side are not parallel. Only the side vein channel 6 closest to the end of the inlet pipe 2 and the outlet pipe 3 has an angle D of 55 degrees with the main vein channel 5. This ensures the optimal effect of the flow channel. In addition, other angles can be adjusted while ensuring the effect. The angle between the side vein channel 6 and the main vein channel 5 gradually decreases as it gets closer to the center of the electrode plate 1 to ensure the fluid flow effect. Specifically, the side vein channels 6 are symmetrically branched from both sides of the main vein channel 5. With the center of the electrode plate 1 as the boundary, there are ten side vein channels 6 above the center of the electrode plate 1, five on each side. The same structure is below the center of the electrode plate 1. The spacing between the side vein channels 6 on each side is 7 mm. The maximum width of the opening of the side vein channel 6 is 2 mm. The width of the side vein channel 6 gradually narrows from the end near the main vein channel 5 to the end of the side vein channel 6. The depth of the side vein channel 6 is 1 mm.

[0026] like Figures 1-4 As shown, in this embodiment, the capillary channel 7 includes an upper capillary channel 701, a lower capillary channel 702, and a terminal capillary channel 703. The upper capillary channel 701 is located on one side of the lateral vein channel 6, the lower capillary channel 702 is located on the other side of the lateral vein channel 6, and the terminal capillary channel 703 is located at the end of the lateral vein channel 6 away from the main vein channel 5. Each lateral vein channel 6 branches obliquely to both sides into three upper capillary channels 701 and three lower capillary channels 702. At the end of the lateral vein channel 6, there is a terminal capillary channel 703. There are seventy capillary channels 7 above the center of the electrode plate 1. The same number of capillary channels are located below the position. The opening width at the connection between the upper capillary channel 701 and the lower capillary channel 702 and the side capillary channel 6 is 0.2 mm. The depth of the upper capillary channel 701, the lower capillary channel 702 and the terminal capillary channel 703 is 0.5 mm. The distance between the terminal capillary channel 703, which is closest to the edge of the electrode plate 1 and the edge of the electrode plate 1, is 2 mm. Therefore, compared with the existing flow channel structure, under the premise that the length of the electrode plate 1 is 100 mm and the width is 50 mm, the effective reaction utilization rate is ≥95%. After assembly, the capillary channels 7 completely cover the membrane electrode reaction area, ensuring mass transfer uniformity.

[0027] like Figures 1-4 As shown, in this embodiment, the connection between the side pulse channel 6 and the main pulse channel 5 is a rounded transition structure; the rounded transition structure is specifically an arc structure with a radius of 0.5mm. This setting is to avoid generating eddies when the fluid turns. In the combined state of the two electrode plates 1, the two side pulse channels 6 form a closed flow channel, simulating the real flow space of electrolyte between the bipolar plates 1.

[0028] like Figures 1-4As shown, in this embodiment, a flow divider plate 8 is also provided on the electrode plate 1. The flow divider plates 8 are arranged in pairs at the center of the main pulse channel 5. The width at both ends of the flow divider plate 8 is smaller than the width at the center of the flow divider plate 8. By setting the flow divider plate 8, the fluid entering from the water inlet pipe 2 is diverted through the flow divider plate 8, thereby improving the uniformity of fluid flow. The width at both ends of the flow divider plate 8 is smaller than the width at the center of the flow divider plate 8 to conform to the flow direction of the fluid, thereby better dispersing the fluid.

[0029] like Figures 1-4 As shown, in this embodiment, the width at both ends of the main channel 5 is greater than the width at the center of the main channel 5; the main channel 5 gradually narrows from the top near the inlet pipe 2 towards the center until it reaches the diversion plate 8, where it is divided into three 0.3mm wide channels by the diversion plate 8, and then gradually widens again from the diversion plate 8 towards the outlet pipe 3. The width at both ends of the main channel 5 is 5mm, and the inner wall of the main channel 5 has a smooth transition without protrusions; when the two electrode plates 1 are combined, the main channel 5 is aligned to form a "double-sided constraint" fluid channel, avoiding the boundary effect deviation of the single electrode plate 1 channel.

[0030] like Figures 1-4 As shown, in this embodiment, multiple upper capillary channels 701 and lower capillary channels 702 are arranged parallel to the side vein channels 6 to increase the effective reaction area of ​​the electrode plate 1 and achieve graded transmission. The angle M between the upper capillary channel 701 and the side vein channel 6 is 16 degrees, and the angle N between the lower capillary channel 702 and the side vein channel 6 is 68 degrees, which are the most preferred angles. In addition, the angles can be adjusted while ensuring the effect.

[0031] like Figures 1-4 As shown, the present invention also includes a method for transporting electrolyzed water fluid. This method is based on a biomimetic leaf vein PEM electrolytic cell electrode plate as described in any of the above claims. Fluid is input through the inlet pipe 2, transported through the main vein channel 5, and diverted through the side vein channel 6. The fluid flows into the side vein channel 6 and simultaneously flows to the outlet pipe 3. The fluid entering the side vein channel 6 flows into the capillary vein channel 7 and then flows from the capillary vein channel 7 to the outlet pipe 3. Specifically, in this embodiment, the fluid selected is pure water, and the pure water is at a concentration of 0.0001m... 3 A flow rate of / s is input from the inlet pipe 2. Pure water is transported through the main vein channel 5. It is then diverted through the rounded transition structure and the side vein channel 6. The fluid flows into the side vein channel 6 and simultaneously flows to the outlet pipe 3. The fluid entering the side vein channel 6 flows into the upper capillary channel 701, the lower capillary channel 702, and the terminal capillary channel 703, and is then evenly distributed to the entire membrane electrode reaction area of ​​the electrode plate 1. Finally, it flows out from the outlet pipe 3. Simulation results based on a simplified monolithic electrolytic cell structure show that the maximum static pressure loss of the flow channel in the above method is 182.44 Pa, which is 89.8% lower than that of the traditional parallel serpentine flow channel (maximum static pressure loss 1784.69 Pa) in the same scenario. This significantly reduces pump energy consumption. Based on an average daily operation of 20 hours for a megawatt-level electrolytic cell and a positive correlation between pump power and pressure loss, the annual operating cost can be reduced by 18%-22%. The low resistance advantage is far superior to the traditional flow channel design, demonstrating significant biomimetic low resistance advantages. Moreover, the average dynamic pressure of the fluid in the flow channel is 10147.78 Pa, with a dynamic pressure standard deviation of only 14.80 Pa. The fluid in the bipolar plate phase 1... The resulting closed flow channel exhibits uniform velocity distribution with no localized "dead water areas," resulting in a 12%-15% increase in electrolysis efficiency and excellent mass transfer uniformity. The capillary channel 7 covers the electrode area, achieving an effective reaction area utilization rate of ≥95%, a 35% improvement compared to the traditional serpentine flow channel (approximately 70%). This increases hydrogen production per unit electrode area by over 32%, demonstrating high effective area utilization. It is suitable for large-scale applications of electrolyzers ranging from kilowatts to megawatts, and is particularly well-suited for high-density electrolysis scenarios with stringent requirements for fluid resistance and mass transfer uniformity. It ensures uniform fluid distribution while significantly reducing fluid transmission resistance due to smooth stage transitions and gradual changes in the flow channel cross-section.

[0032] like Figures 1-4 As shown, in this embodiment, the biomimetic leaf vein-type PEM electrolytic cell electrode plate of the present invention and the parallel serpentine flow channel structure in the prior art are simulated respectively. First, there is simulation example 1: simulation of biomimetic leaf vein-type PEM electrolytic cell electrode plate; I. Parameters: The length of electrode 1 is 100mm, the width is 50mm, and the thickness is 3mm; the diameter of the positioning mounting hole 4 is 3mm. During the assembly of the bipolar plates 1, the flow channels are aligned, and the two electrode plates 1 are assembled by connecting them with M3 screws through the positioning mounting hole 4; In addition, the parameters of the main pulse channel 5, the side pulse channel 6, and the capillary channel 7 are also included. The parameters of the main pulse channel 5, the side pulse channel 6, and the capillary channel 7 are consistent with the parameters recorded above, so they will not be repeated here. II. Simulation conditions: A simple single-piece electrolytic cell 3D model, containing two identical electrode plates 1, which are attached and assembled together in a manner that corresponds to the flow channels; Fluid: Room temperature pure water (density 997 kg / m³) 3 Dynamic viscosity 1.003×10 -3 Pa•s); Inlet pipe 2: Pure water inlet, main vein inlet flow velocity 0.0001m 3 / s, pressure 101325Pa; Water outlet pipe 3: Pure water outlet pressure 101325Pa, free flow; Simulation parameters: 138 iterations, convergence accuracy 1×10⁻⁶ -6turbulence model k-ε; III. Simulation Results (Unit: Pa):

[0033] Secondly, simulation example 2: simulation of parallel serpentine flow channel structure in existing technology; I. Parameters: The size parameters of the electrode plate are consistent with those in simulation example 1. The size parameters of the positioning and mounting holes are consistent with those in simulation example 1. The flow channel structure of a single electrode plate includes 5 parallel serpentine flow channels, each with a width of 1mm and a depth of 2mm. The cross-sectional area of ​​the flow channel is close to the total cross-sectional area of ​​the flow channel in simulation example 1. The number of bends is 3, and the bending angle is 90°. II. Simulation conditions: Simple single-piece electrolytic cell assembly, consistent with simulation example 1; The fluid, inlet velocity of the inlet pipe, outlet conditions of the outlet pipe, and simulation parameters are all consistent with those in simulation example 1. III. Simulation Results (Unit: Pa):

[0034] The simulation results above are analyzed as follows: Resistance advantage: The maximum static pressure loss in simulation example 1 is 182.44 Pa, which is 89.8% lower than that in simulation example 2 (1784.69 Pa), and the annual energy consumption cost can be reduced by 18%-22%; In simulation example 1, the difference between the average static pressure (153323.01 Pa) and the average static pressure of most areas (153323.11 Pa) is only 0.1 Pa, and the static pressure is balanced in more than 90% of the area; in simulation example 2, the difference is 239 Pa, and the overall static pressure is 4.3 times that of the biomimetic flow channel, with significant eddy current loss at the bends. The standard deviation of dynamic pressure in simulation example 1 is 14.80 Pa, which is 94.1% lower than that in simulation example 2 (250.39 Pa). The difference between the average dynamic pressure and the average dynamic pressure of most other examples is only 1.26 Pa. The fluid turbulence is uniform and there are no "dead water areas". The maximum dynamic pressure in simulation example 2 (262615.03 Pa) is 3.3 times that of the biomimetic flow channel in simulation example 1 (79557.96 Pa). There is obvious local turbulence at the bend and uneven electrolyte distribution. The average total pressure difference between simulation example 1 and most other average total pressures is 0.1 Pa, and the maximum total pressure (257836.99 Pa) is only 1 / 5 of that in simulation example 2 (1282748.85 Pa), indicating high energy utilization efficiency. Simulation Example 2 shows large total pressure fluctuations and high values, resulting in severe fluid energy loss, which does not meet energy-saving requirements; while Simulation Example 1's bionic flow channel achieves the dual advantages of low resistance and balanced flow, reducing the maximum static pressure loss by 89.8% and the dynamic pressure standard deviation by 94.1%, making it suitable for large-scale applications. By combining biomimetic advantages with quantitative data, the innovation and feasibility of the technical solution are effectively improved. A simple monolithic electrolytic cell structure with two bipolar plates and their flow channels is used for simulation, which replicates the flow field space of the actual electrolytic cell and avoids the boundary effect deviation of monopolar plate simulation. The simulation results have higher reference value.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A biomimetic leaf vein-shaped PEM electrolytic cell electrode, comprising: The electrode plate (1) is characterized in that the electrode plates (1) are arranged in pairs, and the electrode plate (1) is provided with a biomimetic leaf vein flow channel structure. The biomimetic leaf vein flow channel structure is a symmetrical structure. The biomimetic leaf vein flow channel structure includes a main vein channel (5), a side vein channel (6) and a capillary channel (7). The main vein channel (5) runs through the electrode plate (1). One end of the electrode plate (1) is provided with an inlet pipe (2), and the other end of the electrode plate (1) is provided with an outlet pipe (3). The inlet pipe (2) and the outlet pipe (3) are both connected to the main vein channel (5). The side vein channel (6) is connected to the main vein channel (5), and the capillary channel (7) is connected to the side vein channel (6).

2. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 1, characterized in that, The angle D between the lateral vein channel (6) near one end of the water inlet pipe (2) and the main vein channel (5) is 55 degrees.

3. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 1, characterized in that, The capillary channel (7) includes an upper capillary channel (701), a lower capillary channel (702), and a terminal capillary channel (703). The upper capillary channel (701) is located on one side of the lateral vein channel (6), the lower capillary channel (702) is located on the other side of the lateral vein channel (6), and the terminal capillary channel (703) is located on the lateral vein channel (6) at the end away from the main vein channel (5).

4. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 1, characterized in that, The connection between the lateral vein channel (6) and the main vein channel (5) is a rounded transition structure.

5. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 1, characterized in that, The electrode plate (1) is also provided with a diverter plate (8), and the diverter plates (8) are arranged in pairs at the center of the main pulse channel (5).

6. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 5, characterized in that, The width at both ends of the diverter plate (8) is smaller than the width at the center of the diverter plate (8).

7. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 1, characterized in that, The width at both ends of the main vein channel (5) is greater than the width at the center of the main vein channel (5).

8. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 3, characterized in that, Both the upper capillary channel (701) and the lower capillary channel (702) are arranged in parallel with the lateral vein channel (6).

9. The biomimetic leaf vein-type PEM electrolytic cell electrode plate according to claim 3, characterized in that, The angle M between the upper capillary channel (701) and the lateral vein channel (6) is 16 degrees, and the angle N between the lower capillary channel (702) and the lateral vein channel (6) is 68 degrees.

10. A method for transporting electrolyzed water, the method being based on a biomimetic leaf vein-type PEM electrolytic cell electrode plate as described in any one of claims 1 to 9, characterized in that... Fluid is input through the inlet pipe (2), and the fluid is transported through the main vein channel (5). It is then diverted through the side vein channel (6). The fluid flows into the side vein channel (6) and simultaneously flows to the outlet pipe (3). The fluid that enters the side vein channel (6) flows into the capillary channel (7) and then flows from the capillary channel (7) to the outlet pipe (3).

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