Electrolytic bath

Abstract

The utility model relates to the technical field of water electrolysis hydrogen production, and provides an electrolytic bath, which comprises a plurality of bipolar plates, a plurality of membrane electrodes, a plurality of anode pad frames and a plurality of cathode pad frames, each bipolar plate comprises a plate body part, and a first side and a second side of the plate body part are respectively provided with a first circulating groove and a second circulating groove; the first circulating hole penetrates through the plate body part and is used for forming a first main circulating pipeline of the electrolytic bath, and the first circulating hole is connected with the first circulating groove; the first annular turbulent flow structure is arranged on the inner wall face of the first circulation hole, the first annular turbulent flow structure is arranged towards one end of the first main circulation pipeline in the direction close to the center line of the first circulation hole, and a first included angle A between the first annular turbulent flow structure and the center line of the first circulation hole is an acute angle; the problem that in the prior art, gas generated by each electrolysis cell unit in a large proton exchange membrane electrolysis cell formed by connecting a plurality of single-cell cells in series cannot be discharged smoothly is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by electrolyzing water, and particularly relates to an electrolytic cell. Background Technique

[0002] Human beings have explored in the aspect of energy supply, such as wind power, photovoltaic, etc. However, the problems of uneven regional development, large volatility, and accommodation intermittency of the above-mentioned renewable energy sources have not been substantially solved, and hydrogen production by electrolyzing water can well solve these problems through energy conversion. In order to meet the demand for hydrogen production from renewable energy, hydrogen production electrolytic cells are gradually developing towards the megawatt level and ten megawatt level.

[0003] At present, the mature hydrogen production technologies by electrolyzing water include alkaline hydrogen production by electrolyzing water and proton exchange membrane hydrogen production by electrolyzing water (PEM); among them, the maximum capacity of the electrolytic cell for alkaline hydrogen production by electrolyzing water can reach 5 megawatts, and the hydrogen production rate per single cell can also reach 1000 Nm 3 / h (standard cubic volume per hour); the single cell input power of the proton exchange membrane hydrogen production electrolytic cell (PEM electrolytic cell) reaches the megawatt level, but the hydrogen production rate is only between 200 Nm 3 / h and 500 Nm 3 / h. If you want to increase the single cell hydrogen production capacity of the PEM electrolytic cell to 1000 Nm 3 / h, it is necessary to increase the number of single cells in the electrolytic cell.

[0004] In the prior art, the hydrogen production of a single electrolytic cell can be increased by connecting dozens or even hundreds of single cell chambers in series. A total water inlet and outlet pipeline is set inside the electrolytic cell, and the pure water required for the electrolysis reaction is distributed to each electrolytic cell through the total water inlet pipeline. The gas generated by each electrolytic cell and the pure water that does not participate in the reaction converge in the total water outlet pipeline, and all the gas and water are discharged from the electrolytic cell by the total water outlet pipeline. However, as the number of chambers connected in series increases, the total water outlet pipeline in the electrolytic cell is also extended, and the flow resistance is also increased. When the total water outlet pipeline is extended, the water outlet resistance of each electrolytic cell unit is also increased, resulting in difficulty in discharging the gas and water generated inside each electrolytic cell. The uneven distribution of water flow in each electrolytic cell unit and the inability to take away the generated gas in time will cause a decrease in electrolytic performance and poor consistency of performance between chambers, thereby causing a decrease in the overall performance of the electrolytic cell. In addition, the PEM hydrogen production electrolyzer has the advantage of a high hydrogen production current density, a large amount of gas produced per unit area, and a high volume ratio of gas in water, which exacerbates the problem of large flow resistance on the main water outlet pipeline, and the gases discharged between adjacent chambers will affect each other, further increasing the flow resistance of the water outlet pipeline. When the gas generated in the chamber cannot be discharged in a timely and effective manner, it will cause uneven temperature distribution, reduce the reaction efficiency of the chamber, and thus affect the electrolytic performance of the entire electrolyzer. In severe cases, it may even reduce the service life of the electrolyzer.

[0005] The utility model patent with patent application number CN216427429U claims to protect a non-metal frame bipolar plate for water electrolyzers, and discloses the structure of the plate and the electrolyzer, which is also the common structure of small PEM electrolyzers. However, this structure is only applicable to small PEM electrolyzers, and the oxygen-water channel in the electrolyzer is a straight-through structure, without a targeted drag reduction design.

[0006] The utility model patent with patent application number CN214361733U claims to protect a bipolar plate of a large-scale water electrolysis hydrogen production equipment, which adopts the method of dispersing the alkali inlet channels at the bottom and the lower middle position of the bipolar plate, reducing the area of ​​a single gas alkali channel and increasing the number of gas alkali channels without changing the surface of the gas alkali channel, so as to achieve a more uniform distribution of alkali in the electrolysis chamber composed of two bipolar plates, and timely take away the waste heat generated during the electrolysis process in various parts of the chamber, so as to make the temperature in the electrolytic cell more uniform, and at the same time, the gas generated in the lower half of the electrolysis chamber is discharged as soon as possible, and the concentration of the gas in the upper half of the chamber is reduced, so as to achieve the purpose of reducing the alkali resistance and making the current more evenly distributed in the electrolysis chamber. However, this structure is similar to the PEM electrolyzer structure, and the channel still adopts a straight-through structure, and there is no drag reduction design between the chambers according to the flow direction. Utility Model Content

[0007] The main object of the present utility model is to provide an electrolytic cell to solve the problem that the gas generated by each electrolytic cell unit in a large proton exchange membrane electrolytic cell formed by connecting multiple single-cell compartments in series in the prior art cannot be discharged smoothly.

[0008] To achieve the above object, the present utility model provides an electrolytic cell, comprising: a plurality of bipolar plates, which are sequentially arranged at intervals along a first direction to form a plurality of intervals, and each bipolar plate includes a first flow hole for forming a first main flow pipeline; a plurality of membrane electrodes, which are correspondingly arranged in the plurality of intervals one by one, and each membrane electrode is provided with a first avoidance hole for forming a first main flow pipeline; a plurality of anode gasket frames, which are correspondingly arranged with the plurality of membrane electrodes one by one, and each anode gasket frame is clamped between the first side of the membrane electrode and the second side of the corresponding bipolar plate, and each anode gasket frame is provided with a second avoidance hole for forming a first main flow pipeline and a first through hole for communicating between the second side of the bipolar plate and the first side of the membrane electrode; a plurality of cathode gasket frames, which are correspondingly arranged with the plurality of membrane electrodes one by one, and each cathode gasket frame is clamped between the second side of the membrane electrode and the first side of the corresponding bipolar plate, and each cathode gasket frame is provided with a third avoidance hole for forming a first main flow pipeline and a second through hole for communicating between the first side of the bipolar plate and the second side of the membrane electrode; the bipolar plate further includes a plate body part and a first annular flow disturbing structure, the first side and the second side of the plate body part are respectively provided with a first flow groove and a second flow groove, the first flow hole penetrates through the plate body part and is connected with the first flow groove; the first annular flow disturbing structure is arranged on the inner wall surface of the first flow hole, and along the direction close to the center line of the first flow hole, one end of the first annular flow disturbing structure facing the first main flow pipeline is arranged, and the first included angle A between the first annular flow disturbing structure and the center line of the first flow hole is an acute angle.

[0009] Further, the bipolar plate further includes a plate body part and a first annular flow disturbing structure, the first side and the second side of the plate body part are respectively provided with a first flow groove and a second flow groove, the first flow hole penetrates through the plate body part and is connected with the first flow groove; the first annular flow disturbing structure, the first annular flow disturbing structure is arranged on the inner wall surface of the first flow hole, and along the direction close to the center line of the first flow hole, one end of the first annular flow disturbing structure facing the outlet of the first main flow pipeline is arranged, and the first included angle A between the first annular flow disturbing structure and the center line of the first flow hole is an acute angle.

[0010] Further, the number of the first flow holes is two, the two first flow holes are arranged at intervals at both ends of the first flow groove and are respectively connected with both ends of the first flow groove, and the two first flow holes are respectively used for forming two first main flow pipelines; wherein, a first annular flow disturbing structure is arranged in each first flow hole.

[0011] Further, along a first direction parallel to the center line of the first flow hole, the inner diameter of the first annular flow disturbing structure in one of the two first flow holes gradually increases; the inner diameter of the first annular flow disturbing structure in the other of the two first flow holes gradually decreases.

[0012] Further, a first installation groove for installing a first sealing strip is provided on the second side of the plate body portion, and at least a part of the first installation groove surrounds the first flow hole; a second installation groove for installing a second sealing strip is provided on the first side of the plate body portion, and at least a part of the second installation groove surrounds a first flow passage formed by the first flow groove and the first flow hole.

[0013] Further, 80° ≤ A ≤ 89°; and / or a second included angle between the inner wall surface of the first annular flow disturbing structure and the center line of the first flow hole is B, wherein, 0.5° ≤ B ≤ 5°.

[0014] Further, the bipolar plate includes: a second flow hole, the second flow hole penetrates through the plate body portion for forming a second main flow pipeline of the electrolytic cell, and the second flow hole is connected to the second flow groove; a second annular flow disturbing structure, the second annular flow disturbing structure is arranged on the inner wall surface of the second flow hole, along the direction close to the center line of the second flow hole, one end of the second annular flow disturbing structure facing the second main flow pipeline is arranged, and a third included angle C between the second annular flow disturbing structure and the center line of the second flow hole is an acute angle.

[0015] Further, the number of the second flow holes is two, the two second flow holes are arranged at intervals at both ends of the second flow groove and are respectively connected to both ends of the second flow groove, and the two second flow holes are respectively used for forming two second main flow pipelines; wherein, a second annular flow disturbing structure is arranged in each of the second flow holes.

[0016] Further, a first installation groove for installing a first sealing strip is provided on the second side of the plate body portion, and at least a part of the first installation groove surrounds a second flow passage formed by the second flow groove and the second flow hole; and / or a second installation groove for installing a second sealing strip is provided on the first side of the plate body portion, and at least a part of the second installation groove surrounds the second flow hole.

[0017] Further, along a first direction parallel to the center line of the second flow hole, the inner diameter of the second annular flow disturbing structure gradually increases; and / or 80° ≤ C ≤ 89°; and / or a fourth included angle between the inner wall surface of the second annular flow disturbing structure and the center line of the second flow hole is D, wherein, 0.5° ≤ D ≤ 5°.

[0018] Further, the electrolytic cell includes: a plurality of first sealing strips, which are arranged in one-to-one correspondence with a plurality of bipolar plates, each first sealing strip is installed in a first installation groove of a corresponding bipolar plate, and one side of each first sealing strip away from the bottom surface of the corresponding first installation groove is in contact with a corresponding anode gasket frame; and / or a plurality of second sealing strips, which are arranged in one-to-one correspondence with a plurality of bipolar plates, each second sealing strip is installed in a second installation groove of a corresponding bipolar plate, and one side of each second sealing strip away from the bottom surface of the corresponding second installation groove is in contact with a corresponding cathode gasket frame.

[0019] Further, a fourth avoidance hole for forming a second main flow pipeline is provided on each membrane electrode, and a fifth avoidance hole for forming a second main flow pipeline is provided on each anode gasket frame. A sixth avoidance hole for forming a second main flow pipeline is provided, and is spaced apart from the second avoidance hole and the fifth avoidance hole. The second through hole is spaced apart from the third avoidance hole and the sixth avoidance hole.

[0020] Further, one end of the first main flow pipeline is closed, and the other end of the first main flow pipeline is open. Wherein, when the open end of the first main flow pipeline is the outlet, among any two bipolar plates, the minimum inner diameter of the first flow hole on the bipolar plate close to the outlet of the first main flow pipeline is greater than the maximum inner diameter of the first flow hole on the bipolar plate far from the outlet of the first main flow pipeline; among any two bipolar plates, the minimum inner diameter of the first annular flow disturbing structure on the bipolar plate close to the outlet of the first main flow pipeline is greater than the maximum inner diameter of the first annular flow disturbing structure on the bipolar plate far from the outlet of the first main flow pipeline.

[0021] Further, one end of the second main flow pipeline is closed, and the other end of the second main flow pipeline is open. Wherein, when the open end of the second main flow pipeline is the outlet, among any two bipolar plates, the minimum inner diameter of the second flow hole on the bipolar plate close to the outlet of the second main flow pipeline is greater than the maximum inner diameter of the second flow hole on the bipolar plate far from the outlet of the second main flow pipeline; and / or among any two bipolar plates, the minimum inner diameter of the second annular flow disturbing structure on the bipolar plate close to the outlet of the second main flow pipeline is greater than the maximum inner diameter of the second annular flow disturbing structure on the bipolar plate far from the outlet of the second main flow pipeline, so as to facilitate more oxygenated water to enter the second main flow pipeline without increasing resistance.

[0022] Applying the technical solution of the present utility model, the electrolytic cell of the present utility model includes: a plurality of bipolar plates, which are sequentially arranged at intervals along a first direction to form a plurality of intervals. Each bipolar plate includes a first flow hole for forming a first main flow pipeline; a plurality of membrane electrode assemblies, which are correspondingly arranged in the plurality of intervals one by one. Each membrane electrode assembly is provided with a first avoidance hole for forming the first main flow pipeline; a plurality of anode gasket frames, which are correspondingly arranged with the plurality of membrane electrode assemblies one by one. Each anode gasket frame is clamped between the first side of the membrane electrode assembly and the second side of the corresponding bipolar plate. Each anode gasket frame is provided with a second avoidance hole for forming the first main flow pipeline, and each anode gasket frame is provided with a first through hole for communicating the second side of the bipolar plate and the first side of the membrane electrode assembly; a plurality of cathode gasket frames, which are correspondingly arranged with the plurality of membrane electrode assemblies one by one. Each cathode gasket frame is clamped between the second side of the membrane electrode assembly and the first side of the corresponding bipolar plate. Each cathode gasket frame is provided with a third avoidance hole for forming the first main flow pipeline, and each cathode gasket frame is provided with a second through hole for communicating the first side of the bipolar plate and the second side of the membrane electrode assembly; the bipolar plate further includes a plate body portion and a first annular flow disturbing structure. The first side and the second side of the plate body portion are respectively provided with a first flow groove and a second flow groove. The first flow hole penetrates through the plate body portion and is connected to the first flow groove; the first annular flow disturbing structure is arranged on the inner wall surface of the first flow hole. Along the direction close to the center line of the first flow hole, the first annular flow disturbing structure is arranged towards one end of the first main flow pipeline. The first included angle A between the first annular flow disturbing structure and the center line of the first flow hole is an acute angle. In this way, the bipolar plate of the present utility model is provided with the first annular flow disturbing structure in the first flow hole. When the bipolar plate is installed in the electrolytic cell, the first annular flow disturbing structure is arranged towards the fluid flow direction in the first main flow pipeline to increase local eddy currents, so as to achieve the purpose of breaking the boundary layer to reduce the flow resistance, adjust the discharge directions of gas and water in each electrolytic sub-cell in the composed electrolytic cell, especially in a large PEM hydrogen production electrolytic cell, ensure the timely discharge of gas and water in each electrolytic sub-cell, improve the uniformity of the inlet water flow rate in each electrolytic sub-cell, improve the uniformity of temperature distribution and current density distribution, effectively improve the consistency of the electrolysis performance of each sub-cell, and solve the problem that the gas generated in each electrolytic sub-cell unit in a large proton exchange membrane electrolytic cell composed of a plurality of single-cell sub-cells connected in series in the prior art cannot be smoothly discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0024] Figure 1Shows an isometric view of the bipolar plate of the electrolytic cell according to the present utility model in a first direction;

[0025] Figure 2 Shows Figure 1 The isometric view of the bipolar plate shown in the second direction;

[0026] Figure 3 Shows Figure 1 The front view of the bipolar plate shown in the third direction;

[0027] Figure 4 Shows Figure 1 The front view of the bipolar plate shown in the fourth direction;

[0028] Figure 5 Shows Figure 4 The sectional view of the bipolar plate shown in the E-E direction;

[0029] Figure 6 Shows Figure 5 The partial enlarged view of the first flow hole of the sectional view shown;

[0030] Figure 7 Shows the partial enlarged view of the first flow hole of the second embodiment of the bipolar plate according to the present utility model;

[0031] Figure 8 Shows Figure 4 The sectional view of the bipolar plate shown in the F-F direction;

[0032] Figure 9 Shows Figure 8 The partial enlarged view of the second flow hole of the sectional view shown;

[0033] Figure 10 Shows the partial enlarged view of the second flow hole of the second embodiment of the bipolar plate of the electrolytic cell according to the present utility model;

[0034] Figure 11 Shows an isometric view of the embodiment of the electrolytic cell according to the present utility model;

[0035] Figure 12 Shows Figure 11 The front view of the electrolytic cell shown;

[0036] Figure 13 Shows Figure 12 The sectional view of the bipolar plate shown in the N-N direction;

[0037] Figure 14 Shows Figure 13 The partial enlarged view of the first main flow pipeline of the sectional view shown;

[0038] Figure 15 shows Figure 4 a cross-sectional view of the bipolar plate shown in the M-M direction;

[0039] Figure 16 shows Figure 15 a partial enlarged view of the second main flow pipeline of the cross-sectional view shown;

[0040] Figure 17 shows Figure 11 an isometric view of the membrane electrode of the electrolytic cell shown;

[0041] Figure 18 shows Figure 11 an isometric view of the anode gasket frame of the electrolytic cell shown;

[0042] Figure 19 shows Figure 11 an isometric view of the cathode gasket frame of the electrolytic cell shown.

[0043] Among them, the above-mentioned drawings include the following reference numerals:

[0044] 10, plate body part; 21, first flow groove; 22, second flow groove; 23, first installation groove; 24, second installation groove; 30, first flow hole; 40, first annular flow disturbing structure; 50, second flow hole; 60, second annular flow disturbing structure;

[0045] 100, bipolar plate; 300, membrane electrode; 310, first avoidance hole; 320, fourth avoidance hole; 400, first main flow pipeline; 500, second main flow pipeline; 600, first sealing strip; 700, second sealing strip; 800, anode gasket frame; 810, second avoidance hole; 820, fifth avoidance hole; 830, first through hole; 900, cathode gasket frame; 910, third avoidance hole; 920, sixth avoidance hole; 930, second through hole. Detailed implementation manners

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present invention in detail with reference to the drawings and in combination with the embodiments.

[0047] As Figures 1 to 19As shown in the figure, the present utility model provides an electrolytic cell, comprising: a plurality of bipolar plates 100, the plurality of bipolar plates 100 are arranged at intervals in a first direction in sequence to form a plurality of intervals, and each of the bipolar plates 100 includes a first flow hole 30 for forming a first main flow pipeline 400; a plurality of membrane electrode assemblies 300, the plurality of membrane electrode assemblies 300 are arranged in the plurality of intervals in a one-to-one correspondence, and each of the membrane electrode assemblies 300 is provided with a first avoidance hole 310 for forming the first main flow pipeline 400; a plurality of anode gasket frames 800, the plurality of anode gasket frames 800 are arranged in a one-to-one correspondence with the plurality of membrane electrode assemblies 300, each of the anode gasket frames 800 is clamped between a first side of the membrane electrode assembly 300 and a second side of the corresponding bipolar plate 100, each of the anode gasket frames 800 is provided with a second avoidance hole 810 for forming the first main flow pipeline 400, and each of the anode gasket frames 800 is provided with a first through hole 830 for communicating between the second side of the bipolar plate 100 and the first side of the membrane electrode assembly 300; a plurality of cathode gasket frames 900, the plurality of cathode gasket frames 900 are arranged in a one-to-one correspondence with the plurality of membrane electrode assemblies 300, each of the cathode gasket frames 900 is clamped between a second side of the membrane electrode assembly 300 and a first side of the corresponding bipolar plate 100, each of the cathode gasket frames 900 is provided with a third avoidance hole 910 for forming the first main flow pipeline 400, and each of the cathode gasket frames 900 is provided with a second through hole 930 for communicating between the first side of the bipolar plate 100 and the second side of the membrane electrode assembly 300; the bipolar plate 100 further includes a plate body portion 10 and a first annular flow disturbing structure 40, a first flow groove 21 and a second flow groove 22 are respectively arranged on a first side and a second side of the plate body portion 10, the first flow hole 30 penetrates through the plate body portion 10 and is connected with the first flow groove 21; the first annular flow disturbing structure 40 is arranged on an inner wall surface of the first flow hole 30, and in a direction close to the center line of the first flow hole 30, one end of the first annular flow disturbing structure 40 facing the first main flow pipeline 400 is arranged, and a first included angle A between the first annular flow disturbing structure 40 and the center line of the first flow hole 30 is an acute angle.

[0048] In this way, the bipolar plate of the present utility model is provided with a first annular flow disturbing structure 40 in the first flow hole 30. When the bipolar plate is installed in the electrolytic cell, the first annular flow disturbing structure 40 is arranged towards the fluid flow direction in the first main flow pipeline 400 to increase local eddy currents, so as to achieve the purpose of breaking the boundary layer to reduce the flow resistance, adjust the discharge directions of gas and water in each electrolytic cell in the composed electrolytic cell, especially in a large PEM hydrogen production electrolytic cell, ensure the timely discharge of gas and water in each electrolytic cell, improve the uniformity of the water inlet flow rate in each electrolytic cell, improve the uniformity of temperature distribution and current density distribution, effectively improve the consistency of the electrolysis performance of each cell, and solve the problem that the gas generated in each electrolytic cell unit in a large proton exchange membrane electrolytic cell composed of multiple single-cell chambers connected in series in the prior art cannot be smoothly discharged.

[0049] As Figures 1 to 4 shown, the number of the first flow holes 30 is two. The two first flow holes 30 are arranged at intervals at both ends of the first flow groove 21 and are respectively connected to both ends of the first flow groove 21. The two first flow holes 30 are respectively used to form two first main flow pipelines 400; wherein, a first annular flow disturbing structure 40 is arranged in each of the first flow holes 30.

[0050] Among them, the electrolytic cell is composed of components such as a bipolar plate, an anode gasket frame, a membrane electrode and a cathode gasket frame, and the electrolytic cell is formed by connecting multiple electrolytic cells in series; one first main flow pipeline 400 is used to collect and uniformly discharge the hydrogen and unreacted pure water generated in each electrolytic cell in the electrolytic cell, and the other first main flow pipeline 400 is used for the inflow of pure water to be reacted.

[0051] Specifically, each of the first flow grooves 21 includes a first inflow groove section, a first middle groove section and a first outflow groove section that are arranged on the second side of the plate body 10 and are connected in sequence. One end of the first inflow groove section away from the first middle groove section is connected to the first flow hole 30 for inflow, and one end of the first outflow groove section away from the first middle groove section is connected to the first flow hole 30 for outflow.

[0052] In the first flow hole 30 for inflow, the first annular flow disturbing structure 40 is inclined towards the end away from the inlet of the corresponding first main flow pipeline 400. In the first flow hole 30 for outflow, the first annular flow disturbing structure 40 is inclined towards the end close to the outlet of the corresponding first main flow pipeline 400.

[0053] As Figure 6 and Figure 7As shown, along the first direction parallel to the center line of the first flow hole 30, the inner diameter of the first annular flow disturbing structure 40 in one of the two first flow holes 30 gradually increases; the inner diameter of the first annular flow disturbing structure 40 in the other of the two first flow holes 30 gradually decreases.

[0054] As Figure 6 and Figure 7 shown, a first mounting groove 23 for mounting a first sealing strip 600 is provided on the second side of the plate body portion 10, and at least part of the first mounting groove 23 surrounds the first flow hole 30; a second mounting groove 24 for mounting a second sealing strip 700 is provided on the first side of the plate body portion 10, and at least part of the second mounting groove 24 surrounds the first flow channel jointly formed by the first flow groove 21 and the first flow hole 30.

[0055] As Figure 6 and Figure 7 shown, 80 degrees ≤ A ≤ 89 degrees.

[0056] In the first embodiment of the first included angle A of the present utility model, the first included angle A is 80 degrees.

[0057] In the second embodiment of the first included angle A of the present utility model, the first included angle A is 82 degrees.

[0058] In the third embodiment of the first included angle A of the present utility model, the first included angle A is 84 degrees.

[0059] In the fourth embodiment of the first included angle A of the present utility model, the first included angle A is 86 degrees.

[0060] In the fifth embodiment of the first included angle A of the present utility model, the first included angle A is 89 degrees.

[0061] As Figure 7 shown, the second included angle between the inner wall surface of the first annular flow disturbing structure 40 and the center line of the first flow hole 30 is B, where 0.5 degrees ≤ B ≤ 5 degrees.

[0062] In the first embodiment of the second included angle B of the present utility model, the second included angle B is 0.5 degrees.

[0063] In the second embodiment of the second included angle B of the present utility model, the second included angle B is 1 degree.

[0064] In the third embodiment of the second included angle B of the present utility model, the second included angle B is 2 degrees.

[0065] In the fourth embodiment of the second included angle B of the present utility model, the second included angle B is 3 degrees.

[0066] In the fifth embodiment of the second included angle B of the present utility model, the second included angle B is 4 degrees.

[0067] In the sixth embodiment of the second included angle B of the present utility model, the second included angle B is 5 degrees.

[0068] As Figures 1 to 4 shown, the bipolar plate includes: a second flow-through hole 50, the second flow-through hole 50 penetrates through the plate body portion 10 and is used to form the second main flow pipeline 500 of the electrolytic cell, and the second flow-through hole 50 is connected to the second flow-through groove 22; a second annular flow disturbance structure 60, the second annular flow disturbance structure 60 is arranged on the inner wall surface of the second flow-through hole 50, and along the direction close to the center line of the second flow-through hole 50, one end of the second annular flow disturbance structure 60 facing the second main flow pipeline 500 is arranged, and the third included angle C between the second annular flow disturbance structure 60 and the center line of the second flow-through hole 50 is an acute angle.

[0069] Wherein, the second main flow pipeline 500 is used to collect and uniformly discharge the oxygen and unreacted pure water generated in each electrolytic chamber in the electrolytic cell.

[0070] As Figures 1 to 4 shown, the number of the second flow-through holes 50 is two, the two second flow-through holes 50 are arranged at intervals at both ends of the second flow-through groove 22 and are respectively connected to both ends of the second flow-through groove 22, and the two second flow-through holes 50 are respectively used to form two second main flow pipelines 500; wherein, a second annular flow disturbance structure 60 is arranged in each second flow-through hole 50.

[0071] Specifically, each second flow-through groove 22 includes a second inflow groove section, a second middle groove section and a second outflow groove section which are arranged on the second side of the plate body portion 10 and are connected in sequence. One end of the second inflow groove section far from the second middle groove section is connected to the second flow-through hole 50 for inflow, and one end of the second outflow groove section far from the second middle groove section is connected to the second flow-through hole 50 for outflow.

[0072] In the second flow-through hole 50 for inflow, one end of the second annular flow disturbance structure 60 is inclined away from the inlet of the corresponding second main flow pipeline 500, and in the second flow-through hole 50 for outflow, one end of the second annular flow disturbance structure 60 is inclined towards the outlet of the corresponding second main flow pipeline 500.

[0073] As Figure 9 and Figure 10As shown, a first mounting groove 23 for mounting a first sealing strip 600 is provided on the second side of the plate body portion 10, and at least part of the first mounting groove 23 is arranged around a second flow passage jointly formed by a second flow groove 22 and a second flow hole 50; and / or a second mounting groove 24 for mounting a second sealing strip 700 is provided on the first side of the plate body portion 10, and at least part of the second mounting groove 24 is arranged around the second flow hole 50.

[0074] Specifically, the first mounting groove 23 is arranged around the second flow passage jointly formed by the second flow groove 22 and two second flow holes 50, and also respectively around the two first flow holes 30, so as to separate any two of the second flow passage and the two first flow holes 30 from each other; the second mounting groove 24 is arranged around the first flow passage jointly formed by the first flow groove 21 and the first flow hole 30, and also respectively around the two second flow holes 50, so as to separate any two of the first flow passage and the two second flow holes 50 from each other.

[0075] As Figure 9 and Figure 10 shown, along a first direction parallel to the center line of the second flow hole 50, the inner diameter of the second annular flow disturbing structure 60 gradually increases; and / or 80° ≤ C ≤ 89°; and / or a fourth included angle between the inner wall surface of the second annular flow disturbing structure 60 and the center line of the second flow hole 50 is D, where 0.5° ≤ D ≤ 5°.

[0076] As Figure 9 and Figure 10 shown, 80° ≤ C ≤ 89°.

[0077] In the first embodiment of the third included angle C of the present utility model, the third included angle C is 80°.

[0078] In the second embodiment of the third included angle C of the present utility model, the third included angle C is 82°.

[0079] In the third embodiment of the third included angle C of the present utility model, the third included angle C is 84°.

[0080] In the fourth embodiment of the third included angle C of the present utility model, the third included angle C is 86°.

[0081] In the fifth embodiment of the third included angle C of the present utility model, the third included angle C is 89°.

[0082] As Figure 10 shown, a fourth included angle between the inner wall surface of the first annular flow disturbing structure 40 and the center line of the first flow hole 30 is D, where 0.5° ≤ D ≤ 5°.

[0083] In the first embodiment of the fourth angle D of the present utility model, the fourth angle D is 0.5 degrees.

[0084] In the second embodiment of the fourth angle D of the present utility model, the fourth angle D is 1 degree.

[0085] In the third embodiment of the fourth angle D of the present utility model, the fourth angle D is 2 degrees.

[0086] In the fourth embodiment of the fourth angle D of the present utility model, the fourth angle D is 3 degrees.

[0087] In the fifth embodiment of the fourth angle D of the present utility model, the fourth angle D is 4 degrees.

[0088] In the sixth embodiment of the fourth angle D of the present utility model, the fourth angle D is 5 degrees.

[0089] As Figure 6 、 Figure 7 、 Figure 9 and Figure 10 shown, the thickness of the plate body part 10 is H, where 1 mm ≤ H ≤ 5 mm.

[0090] In the first embodiment of the plate body part 10 of the present utility model, the thickness of the plate body part 10 is 1 mm.

[0091] In the second embodiment of the plate body part 10 of the present utility model, the thickness of the plate body part 10 is 2 mm.

[0092] In the third embodiment of the plate body part 10 of the present utility model, the thickness of the plate body part 10 is 3 mm.

[0093] In the fourth embodiment of the plate body part 10 of the present utility model, the thickness of the plate body part 10 is 4 mm.

[0094] In the fifth embodiment of the plate body part 10 of the present utility model, the thickness of the plate body part 10 is 5 mm.

[0095] Specifically, the production material of the bipolar plate includes titanium, and the bipolar plate can be processed by methods such as casting, stamping, etching, and machining.

[0096] Among them, the thickness of each membrane electrode 300 is less than the thickness of any one plate body part 10; and / or the thickness of each membrane electrode 300 is less than the thickness of any one anode pad frame 800; and / or the thickness of each membrane electrode 300 is less than the thickness of any one cathode pad frame 900.

[0097] Specifically, a fourth avoidance hole 320 for forming the second main flow pipeline 500 is provided on each membrane electrode 300, a fifth avoidance hole 820 for forming the second main flow pipeline 500 is provided on each anode gasket frame 800, and a sixth avoidance hole 920 for forming the second main flow pipeline 500 is provided on each cathode gasket frame 900. Among them, the first through hole 830 is spaced from both the second avoidance hole 810 and the fifth avoidance hole 820, and the second through hole 930 is spaced from both the third avoidance hole 910 and the sixth avoidance hole 920.

[0098] In the electrolytic cell of the present utility model, an anode gasket frame 800, a membrane electrode 300, and a cathode gasket frame 900 are sandwiched by two bipolar plates 100 to form an electrolytic cell unit. The bipolar plate 100 serves as the positive and negative plates of two adjacent electrolytic cell units at the same time, and the membrane electrode 300 is the key component for the electrolytic cell to carry out electrochemical reactions.

[0099] The electrolytic cell of the present utility model includes: a plurality of first sealing strips 600, the plurality of first sealing strips 600 are arranged in one-to-one correspondence with the plurality of bipolar plates 100, each first sealing strip 600 is installed in the first installation groove 23 on the second side of the corresponding bipolar plate 100, and one side of each first sealing strip 600 away from the bottom surface of the corresponding first installation groove 23 is in contact with the corresponding anode gasket frame 800; and / or a plurality of second sealing strips 700, the plurality of second sealing strips 700 are arranged in one-to-one correspondence with the plurality of bipolar plates 100, each second sealing strip 700 is installed in the second installation groove 24 on the first side of the corresponding bipolar plate 100, and one side of each second sealing strip 700 away from the bottom surface of the corresponding second installation groove 24 is in contact with the corresponding cathode gasket frame 900.

[0100] Optionally, the manufacturing materials of the first sealing strip 600 and the second sealing strip 700 of the present utility model include silicone rubber, ethylene propylene diene monomer rubber, nitrile rubber, fluororubber, etc.

[0101] Such as Figure 13 and Figure 15As shown, one end of the first main flow passage 400 is closed and the other end is open. When the open end of the first main flow passage 400 is the outlet, among any two bipolar plates 100, the minimum inner diameter of the first flow hole 30 on the bipolar plate 100 close to the outlet of the first main flow passage 400 is greater than the maximum inner diameter of the first flow hole 30 on the bipolar plate 100 far from the outlet of the first main flow passage 400; and / or among any two bipolar plates 100, the minimum inner diameter of the first annular flow disturbing structure 40 on the bipolar plate 100 close to the outlet of the first main flow passage 400 is greater than the maximum inner diameter of the first annular flow disturbing structure 40 on the bipolar plate 100 far from the outlet of the first main flow passage 400, so as to facilitate more oxygen water to enter the first main flow passage 400 without increasing resistance. When the open end of the first main flow passage 400 is the inlet, among any two bipolar plates 100, the maximum inner diameter of the first flow hole 30 on the bipolar plate 100 close to the inlet of the first main flow passage 400 is less than the minimum inner diameter of the first flow hole 30 on the bipolar plate 100 far from the inlet of the first main flow passage 400; among any two bipolar plates 100, the maximum inner diameter of the first annular flow disturbing structure 40 on the bipolar plate 100 close to the inlet of the first main flow passage 400 is less than the minimum inner diameter of the first annular flow disturbing structure 40 on the bipolar plate 100 far from the inlet of the first main flow passage 400, so as to facilitate more hydrogen water to enter the first main flow passage 400 without increasing resistance.

[0102] As Figure 13 and Figure 15As shown, one end of the second main flow pipeline 500 is closed, and the other end of the second main flow pipeline 500 is open. Among them, when the open end of the second main flow pipeline 500 is the outlet, in any two bipolar plates 100, the minimum inner diameter of the second flow hole 50 on the bipolar plate 100 close to the outlet of the second main flow pipeline 500 is greater than the maximum inner diameter of the second flow hole 50 on the bipolar plate 100 far from the outlet of the second main flow pipeline 500; and / or in any two bipolar plates 100, the minimum inner diameter of the second annular flow disturbing structure 60 on the bipolar plate 100 close to the outlet of the second main flow pipeline 500 is greater than the maximum inner diameter of the second annular flow disturbing structure 60 on the bipolar plate 100 far from the outlet of the second main flow pipeline 500, so as to facilitate more oxygen water to enter the second main flow pipeline 500 without increasing resistance; when the open end of the second main flow pipeline 500 is the inlet, in any two bipolar plates 100, the maximum inner diameter of the second flow hole 50 on the bipolar plate 100 close to the inlet of the second main flow pipeline 500 is less than the minimum inner diameter of the second flow hole 50 on the bipolar plate 100 far from the inlet of the second main flow pipeline 500; in any two bipolar plates 100, the maximum inner diameter of the second annular flow disturbing structure 60 on the bipolar plate 100 close to the inlet of the second main flow pipeline 500 is less than the minimum inner diameter of the second annular flow disturbing structure 60 on the bipolar plate 100 far from the inlet of the second main flow pipeline 500, so as to facilitate more oxygen water to enter the second main flow pipeline 500 without increasing resistance.

[0103] The electrolytic cell of the present utility model includes two end plates (at the positions in the figure). The two end plates are arranged at intervals in the first direction and are respectively located on the opposite sides of a plurality of bipolar plates 100, so that the first end of one first main flow pipeline 400 is open and the second end is closed for fluid inflow, the second end of the other first main flow pipeline 400 is open and the first end is closed for fluid outflow, and the first ends of each second main flow pipeline 500 are all open and the second ends are all closed for fluid inflow and outflow respectively.

[0104] Optionally, the first direction is the horizontal direction or the vertical direction.

[0105] Specifically, the assembly method of the electrolytic cell of the present utility model includes two forms: stacking in the vertical direction and stacking in the horizontal direction. The center lines of the first main flow pipeline 400 and the second main flow pipeline 500 are both parallel to the vertical direction or parallel to the horizontal direction.

[0106] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0107] The electrolytic cell of the present utility model includes: a plurality of bipolar plates 100, the plurality of bipolar plates 100 are sequentially arranged at intervals along a first direction to form a plurality of intervals, and each of the bipolar plates 100 includes a first flow hole 30 for forming a first main flow pipeline 400; a plurality of membrane electrode assemblies 300, the plurality of membrane electrode assemblies 300 are correspondingly arranged in the plurality of intervals, and each of the membrane electrode assemblies 300 is provided with a first avoidance hole 310 for forming the first main flow pipeline 400; a plurality of anode gasket frames 800, the plurality of anode gasket frames 800 are correspondingly arranged with the plurality of membrane electrode assemblies 300, and each of the anode gasket frames 800 is clamped between a first side of the membrane electrode assembly 300 and a second side of the corresponding bipolar plate 100, and each of the anode gasket frames 800 is provided with a second avoidance hole 810 for forming the first main flow pipeline 400, and each of the anode gasket frames 800 is provided with a first through hole 830 for communicating between the second side of the bipolar plate 100 and the first side of the membrane electrode assembly 300; a plurality of cathode gasket frames 900, the plurality of cathode gasket frames 900 are correspondingly arranged with the plurality of membrane electrode assemblies 300, and each of the cathode gasket frames 900 is clamped between a second side of the membrane electrode assembly 300 and a first side of the corresponding bipolar plate 100, and each of the cathode gasket frames 900 is provided with a third avoidance hole 910 for forming the first main flow pipeline 400, and each of the cathode gasket frames 900 is provided with a second through hole 930 for communicating between the first side of the bipolar plate 100 and the second side of the membrane electrode assembly 300; the bipolar plate 100 further includes a plate body portion 10 and a first annular flow disturbing structure 40, a first flow groove 21 and a second flow groove 22 are respectively arranged on a first side and a second side of the plate body portion 10, and the first flow hole 30 penetrates through the plate body portion 10 and is connected to the first flow groove 21; the first annular flow disturbing structure 40 is arranged on an inner wall surface of the first flow hole 30, and along a direction close to the center line of the first flow hole 30, the first annular flow disturbing structure 40 is arranged towards an outlet of the first main flow pipeline 400, and a first included angle A between the first annular flow disturbing structure 40 and the center line of the first flow hole 30 is an acute angle.In this way, by providing the first annular flow disturbance structure 40 in the first flow hole 30 of the bipolar plate of the present utility model, when the bipolar plate is installed in the electrolytic cell, the first annular flow disturbance structure 40 is arranged towards the fluid flow direction in the first main flow pipeline 400, so as to increase local eddy currents, achieve the purpose of breaking the boundary layer to reduce the flow resistance, adjust the discharge directions of gas and water in each electrolysis compartment in the composed electrolytic cell, especially in a large PEM hydrogen production electrolytic cell, ensure the timely discharge of gas and water in each electrolysis compartment, improve the uniformity of the water inlet flow rate in each electrolysis compartment, improve the uniformity of temperature distribution and current density distribution, effectively improve the consistency of the electrolysis performance of each compartment, and solve the problem that the gas generated in each electrolysis compartment unit in a large proton exchange membrane electrolytic cell composed of multiple single-cell compartments connected in series in the prior art cannot be discharged smoothly.

[0108] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0109] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0110] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present application; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0111] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0112] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning and thus should not be construed as limiting the protection scope of the present application.

[0113] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electrolytic cell, characterized in that: include: A plurality of bipolar plates (100), the plurality of bipolar plates (100) being sequentially arranged at intervals along a first direction to form a plurality of intervals, each of the bipolar plates (100) comprising a first flow hole (30) for forming a first main flow pipeline (400); A plurality of membrane electrodes (300), the plurality of membrane electrodes (300) being arranged one by one in the plurality of intervals, and each of the membrane electrodes (300) being provided with a first avoidance hole (310) for forming the first main flow pipeline (400); a plurality of anode gasket frames (800), the plurality of anode gasket frames (800) being arranged in one-to-one correspondence with the plurality of membrane electrodes (300), each of the anode gasket frames (800) being sandwiched between a first side of the membrane electrode (300) and a second side of the corresponding bipolar plate (100), each of the anode gasket frames (800) being provided with a second avoidance hole (810) for forming the first main flow passage (400), and each of the anode gasket frames (800) being provided with a first through hole (830) for connecting the second side of the bipolar plate (100) and the first side of the membrane electrode (300); A plurality of cathode gasket frames (900), the plurality of cathode gasket frames (900) being arranged in one-to-one correspondence with the plurality of membrane electrodes (300), each of the cathode gasket frames (900) being sandwiched between the second side of the membrane electrode (300) and the first side of the corresponding bipolar plate (100), each of the cathode gasket frames (900) being provided with a third avoidance hole (910) for forming the first main flow passage (400), and each of the cathode gasket frames (900) being provided with a second through hole (930) for connecting the first side of the bipolar plate (100) and the second side of the membrane electrode (300); The bipolar plate (100) further comprises a plate body (10) and a first annular spoiler structure (40); a first flow groove (21) and a second flow groove (22) are respectively provided on the first side and the second side of the plate body (10); the first flow hole (30) is arranged through the plate body (10) and is connected to the first flow groove (21); the first annular spoiler structure (40) is arranged on the inner wall surface of the first flow hole (30); along a direction close to the center line of the first flow hole (30), the first annular spoiler structure (40) is arranged toward one end of the first main flow pipeline (400); and a first angle A between the first annular spoiler structure (40) and the center line of the first flow hole (30) is an acute angle.

2. The electrolytic cell according to claim 1, characterized in that The number of the first circulation holes (30) is two, and the two first circulation holes (30) are arranged at intervals at the two ends of the first circulation groove (21) and are respectively connected to the two ends of the first circulation groove (21), and the two first circulation holes (30) are respectively used to form two first main flow pipes (400); wherein the first annular spoiler structure (40) is arranged in each of the first circulation holes (30).

3. The electrolytic cell according to claim 2, characterized in that Along a first direction parallel to the center line of the first flow hole (30), The inner diameter of the first annular flow-disturbing structure (40) in one of the two first flow holes (30) gradually increases; The inner diameter of the first annular flow-disturbing structure (40) in the other of the two first flow holes (30) gradually decreases.

4. The electrolytic cell according to claim 1, characterized in that A first installation groove (23) for installing a first sealing strip (600) is provided on the second side of the plate body (10), and at least a portion of the first installation groove (23) is arranged around the first circulation hole (30); A second installation groove (24) for installing a second sealing strip (700) is provided on the first side of the plate body (10), and at least a portion of the second installation groove (24) is arranged around a first circulation channel composed of the first circulation groove (21) and the first circulation hole (30).

5. The electrolytic cell according to claim 1, characterized in that 80 degrees ≤ A ≤ 89 degrees; and / or A second angle between the inner wall surface of the first annular spoiler structure (40) and the center line of the first flow hole (30) is B, wherein 0.5 degrees ≤ B ≤ 5 degrees.

6. The electrolytic cell according to claim 1, characterized in that The bipolar plate (100) comprises: A second circulation hole (50), the second circulation hole (50) is arranged through the plate body (10) to form a second main flow pipeline (500) of the electrolytic cell, and the second circulation hole (50) is connected to the second circulation groove (22); A second annular spoiler structure (60), wherein the second annular spoiler structure (60) is arranged on the inner wall surface of the second circulation hole (50), and along the direction close to the center line of the second circulation hole (50), the second annular spoiler structure (60) is arranged toward one end of the second main flow pipe (500), and a third angle C between the second annular spoiler structure (60) and the center line of the second circulation hole (50) is an acute angle.

7. The electrolytic cell according to claim 6, characterized in that The number of the second circulation holes (50) is two, and the two second circulation holes (50) are arranged at intervals at the two ends of the second circulation groove (22) and are respectively connected to the two ends of the second circulation groove (22), and the two second circulation holes (50) are respectively used to form two second main flow pipes (500); wherein each of the second circulation holes (50) is provided with the second annular spoiler structure (60).

8. The electrolytic cell according to claim 6, characterized in that A first installation groove (23) for installing a first sealing strip (600) is provided on the second side of the plate body (10), and at least a portion of the first installation groove (23) is arranged around a second circulation channel composed of the second circulation groove (22) and the second circulation hole (50); and / or A second installation groove (24) for installing a second sealing strip (700) is provided on the first side of the plate body (10), and at least a portion of the second installation groove (24) is arranged around the second circulation hole (50).

9. The electrolytic cell according to claim 6, characterized in that Along a first direction parallel to the center line of the second flow hole (50), the inner diameter of the second annular flow-disturbing structure (60) gradually increases; and / or 80 degrees ≤ C ≤ 89 degrees; and / or A fourth angle between the inner wall surface of the second annular spoiler structure (60) and the center line of the second flow hole (50) is D, wherein 0.5 degrees ≤ D ≤ 5 degrees.

10. The electrolytic cell according to claim 4 or 8, characterized in that: The electrolytic cell comprises: a plurality of first sealing strips (600), the plurality of first sealing strips (600) being arranged in one-to-one correspondence with the plurality of bipolar plates (100), each of the first sealing strips (600) being installed in the first mounting groove (23) of the corresponding bipolar plate (100), and a side of each of the first sealing strips (600) away from the bottom surface of the corresponding first mounting groove (23) being in contact with the corresponding anode gasket frame (800); and / or A plurality of second sealing strips (700) are provided in one-to-one correspondence with the plurality of bipolar plates (100), each of the second sealing strips (700) is installed in the second mounting groove (24) of the corresponding bipolar plate (100), and a side of each of the second sealing strips (700) away from the bottom surface of the corresponding second mounting groove (24) is in contact with the corresponding cathode gasket frame (900).

11. The electrolytic cell according to claim 6, characterized in that Each of the membrane electrodes (300) is provided with a fourth avoidance hole (320) for forming the second main flow pipeline (500), each of the anode gasket frames (800) is provided with a fifth avoidance hole (820) for forming the second main flow pipeline (500), and each of the cathode gasket frames (900) is provided with a sixth avoidance hole (920) for forming the second main flow pipeline (500); The first through hole (830) is spaced apart from the second avoidance hole (810) and the fifth avoidance hole (820), and the second through hole (930) is spaced apart from the third avoidance hole (910) and the sixth avoidance hole (920).

12. The electrolytic cell according to claim 1, characterized in that One end of the first main flow channel (400) is closed, and the other end of the first main flow channel (400) is open, wherein: When the open end of the first main flow passage (400) is an outlet, in any two of the bipolar plates (100), the minimum inner diameter of the first flow hole (30) on the bipolar plate (100) close to the outlet of the first main flow passage (400) is greater than the maximum inner diameter of the first flow hole (30) on the bipolar plate (100) away from the outlet of the first main flow passage (400); in any two of the bipolar plates (100), the minimum inner diameter of the first annular spoiler structure (40) on the bipolar plate (100) close to the outlet of the first main flow passage (400) is greater than the maximum inner diameter of the first annular spoiler structure (40) on the bipolar plate (100) away from the outlet of the first main flow passage (400).

13. The electrolytic cell according to claim 6, characterized in that One end of the second main flow channel (500) is closed, and the other end of the second main flow channel (500) is open, wherein: When the open end of the second main flow passage (500) is an outlet, in any two of the bipolar plates (100), the minimum inner diameter of the second flow hole (50) on the bipolar plate (100) close to the outlet of the second main flow passage (500) is greater than the maximum inner diameter of the second flow hole (50) on the bipolar plate (100) away from the outlet of the second main flow passage (500); and / or in any two of the bipolar plates (100), the minimum inner diameter of the second annular spoiler structure (60) on the bipolar plate (100) close to the outlet of the second main flow passage (500) is greater than the maximum inner diameter of the second annular spoiler structure (60) on the bipolar plate (100) away from the outlet of the second main flow passage (500), so as to allow more oxygen water to enter the second main flow passage (500) without increasing resistance.

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