A rectangular plate for high-power electrolytic cell

Abstract

The present invention relates to the technical field of hydrogen production and energy storage by electrolysis of water, and specifically to a rectangular plate for a high-power electrolyzer. The plate is in the shape of a "rectangle", and the main body is composed of a pole frame and a main pole plate. The main pole plate is accommodated in the pole frame to form an integrated type, and the front and back sides of the main pole plate are respectively the cathode active area and the anode active area; on the cathode side of the rectangular plate, a "single-inlet-single-outlet" passage is arranged, which forms a cathode flow path with the cathode active area; on the anode side of the rectangular plate, a "double-inlet-double-outlet" passage is arranged, which forms an anode flow path with the anode active area. The present invention can reduce the material loss in the process of manufacturing the electrodes and diaphragms of the electrolyzer; the reaction medium of the cathode and the anode has good uniform distribution and consistency, the gas production is collected quickly, and the drainage effect is good; the main pole plate has strong mass transfer and exhaust capacity and heat exchange capacity in the active area, which can effectively improve the performance of the electrolyzer.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production and energy storage by electrolyzing water, and in particular to a rectangular plate used in a high-power electrolyzer. Background Art

[0002] Renewable energy is volatile and intermittent, and is usually difficult to match local consumption capacity, forcing people to "abandon water, wind and solar power", resulting in a waste of renewable energy. Using excess "green electricity" to electrolyze water to produce hydrogen for energy storage during off-peak hours, and using fuel cells or hydrogen-fired steam turbines to generate electricity and return it to the grid during peak hours can effectively solve the problem of renewable energy consumption and grid stability.

[0003] At present, alkaline water electrolysis (AWE) is one of the electrolytic hydrogen production methods for producing green hydrogen. It is also the electrolytic hydrogen production technology with the longest industrial development time and the most mature technology at this stage. As one of the main core components of the electrolyzer, the plate has the following main functions: structural support, separation of two levels, flow conduction, conduction, heat transfer and other functions. Currently available large-scale commercial alkaline water electrolyzers usually adopt a cylindrical tank design and circular plates. Therefore, when making electrodes and diaphragms, they need to be cut into circles, and the material loss is ≥21.5%. As the diameter of the cylindrical electrolyzer becomes larger and larger, the gas production of the single plate of the electrolyzer becomes larger and larger. The top of the circular plate is prone to form a gas collection area, making it difficult for the electrolyte and the diaphragm to fully contact, which reduces the electrolysis efficiency.

[0004] In addition, the electrochemical physical phenomena occurring at the cathode and anode are also different. For example, in terms of gas production, the gas production of the cathode is twice that of the anode. As the power level of the electrolytic device continues to increase, the circular structure design commonly used in the electrolytic cell plates has deficiencies in reducing material loss, evenly distributing the medium, and quickly exhausting gas. Therefore, it is necessary to optimize the plate structure design. Summary of the invention

[0005] In view of the above shortcomings and deficiencies of the prior art, the present invention provides a rectangular plate for a high-power electrolytic cell.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A rectangular electrode plate for a high-power electrolytic cell, the electrode plate is in a rectangular shape, the electrode plate body is composed of a pole frame 7 and a main pole plate 8, the main pole plate 8 is accommodated in the pole frame 7 to form an integrated type, and the front and back sides of the main pole plate 8 are respectively a cathode active area 14 and an anode active area 23; on the cathode side of the rectangular electrode plate, the upper and lower sides of the pole frame 7 are respectively arranged with a "single-inlet-single-outlet" passage, which forms a cathode flow path with the cathode active area 14; on the anode side of the rectangular electrode plate, the upper and lower sides of the pole frame 7 are respectively arranged with a "double-inlet-double-outlet" passage, which forms an anode flow path with the anode active area 14.

[0008] Positioning holes 41 , 42 , 43 , 44 are respectively arranged at the four corners of the pole frame 7 .

[0009] Cathode inlet and outlet passages are arranged on the upper and lower sides of the cathode active area 14 in the pole frame 7, respectively, and form a cathode flow path together with the cathode active area 14 between the two passages. The cathode inlet passage is provided with an inlet manifold 11, at least one inlet manifold 12-1, 12-2, 12-3, 12-4 and at least one cathode shunt area 13-1, 13-2, 13-3, 13-4; the cathode outflow passage is provided with at least one cathode confluence area 15-1, 15-2, 15-3, 15-4, at least one outflow manifold 16-1, 16-2, 16-3, 16-4 and a cathode outflow manifold 17.

[0010] The inlet manifold 11 is connected to the inlet manifolds 12-1, 12-2, 12-3, and 12-4, and the reaction medium enters the inlet manifold from the inlet manifold, then flows through the cathode diversion areas 13-1, 13-2, 13-3, and 13-4 for diversion, and then flows to the cathode active area 14 for electrolysis reaction by applying an external current; the reaction medium and the generated gas are gathered in the confluence area, and flow through the outlet manifolds 16-1, 16-2, 16-3, and 16-4 and the connected outlet manifold 17, so that the medium circulation flow of the cathode flow path realizes the form of "single inlet and single outlet".

[0011] The cathode shunt regions 13-1, 13-2, 13-3, 13-4 are in the shape of a "cup-shaped mouth", connecting the inlet manifolds 12-1, 12-2, 12-3, 12-4 and the cathode active region 14, and a guide ridge 5 and a rectangular boss 6 are arranged in the "cup-shaped mouth" to evenly shunt the reaction medium and provide structural support; wherein each shunt region is connected by a separate inlet manifold 12-1, 12-2, 12-3, 12-4, and each shunt region is relatively independent; the cathode The confluence areas 15-1, 15-2, 15-3, and 15-4 are in the shape of a "cup-shaped mouth", connecting the cathode active area 14 and the outlet manifolds 16-1, 16-2, 16-3, and 16-4, and a guide ridge 5 and a rectangular boss 6 are arranged in the "cup-shaped mouth", which play a role in uniformly conducting the reaction medium, generating gas and structural support; wherein each confluence area is conducted by a separate outlet manifold 16-1, 16-2, 16-3, and 16-4, and each confluence area is relatively independent.

[0012] The above-mentioned flow dividing area and flow converging area are in the shape of a "cup-shaped mouth", which is conducive to the uniform distribution of the reaction medium and the collection of the gas-liquid two-phase mixture.

[0013] The cathode active area 14 of the main electrode plate 8 is provided with an array of bosses 3, and the mesh-like cross “grooves” between the bosses provide flow for the reaction medium and generated gas in the cathode active area 14 .

[0014] Anode inlet and outlet passages are arranged on the upper and lower sides of the anode active area 23 in the pole frame 7, respectively, and form an anode flow path with the anode active area 23 between the two passages. The anode inlet passage is provided with anode inlet manifolds 21-1, 21-2 and anode shunt areas 22-1, 22-2; the anode outflow passage is provided with anode confluence areas 24-1, 24-2 and anode outflow manifolds 25-1, 25-2.

[0015] The inlet manifolds 21-1 and 21-2 are directly connected to the anode diversion areas 22-1 and 22-2. The mainstream of the reaction medium directly enters the diversion area through the inlet manifold for distribution, and enters the anode active area 23. Under the action of the external current, an electrolytic reaction occurs. The reaction medium and the generated gas merge in the anode confluence area 24-1 and 24-2, and then flow through the outlet manifold to be discharged from the electrolytic cell, so that the medium circulation flow of the anode flow path realizes the form of "double inlet and double outlet".

[0016] The anode shunt areas 22-1 and 22-2 of the described electrode plates are in the shape of a "trumpet", connecting the inlet manifolds 21-1 and 21-2 and the anode active area 23, and the guide ridges 5 and linearly arranged rectangular bosses 6 that can evenly shunt the reaction medium and structural support are arranged in the "trumpet", wherein each shunt area is connected by a separate inlet manifold 21-1 and 21-2; the anode confluence areas 24-1 and 24-2 of the described main electrode plates are in the shape of a "trumpet", connecting the anode active area 23 and the outlet manifolds 25-1 and 25-2, and the guide ridges 5 and linearly arranged rectangular bosses 6 that can evenly conduct the reaction medium and the generated gas are arranged in the "trumpet", wherein each confluence area independently conducts the outlet manifold 25-1 and 25-2, and the confluence areas are relatively independent.

[0017] The shape of the diversion area and the confluence area is a "trumpet-mouth", which is beneficial to saving plate space and increasing the proportion of effective area.

[0018] Preferably, the opening positions of the inlet manifold and outlet manifold openings of the anode flow path are located in the annular blank area of ​​the inlet diversion manifold, which is conducive to the compact arrangement of the flow path.

[0019] The anode active area 23 of the main electrode plate is provided with an array of bosses 3, and the mesh-like cross "grooves" between the bosses are used for the flow of reaction medium and generated gas in the anode active area.

[0020] In the above-mentioned anode and cathode active areas, the flow conduction, electrical conduction and heat transfer characteristics of the plates can be optimized by changing the geometric features of the bosses and the arrangement of the arrays.

[0021] At the same time, the mesh-like cross "grooves" formed between the bosses are flow channels for the reaction medium and the generated gas, and their width can be adjusted by changing the row spacing and column spacing values; the flow path depth can be adjusted by changing the height value of the boss; the values ​​of the row spacing and column spacing of the bosses are set according to the mechanical and electrical characteristics of the plate and the gas production rate requirements.

[0022] The "cross" boss array 3 arranged in the cathode active area 14 and the anode active area 23 is arranged in a cross-shaped array or a straight-line array; wherein the boss shape can also be circular, elliptical or diamond-shaped.

[0023] When the boss is a "X"-shaped boss, it has four edges and corners A, B, C, and D, and the cross-sectional shape is a "X" shape. The edge of the top surface of the boss and the junction of the side surface of the boss with the groove plane 33 are respectively provided with rounded corners; the longitudinal half length a of the boss, the transverse half length b, the height value h of the boss, and the ratio a / b of the longitudinal half length a and the transverse half length b of the boss are 0.1-10, and h is 1-30mm.

[0024] When the bipolar plate substrate is made of metal, it includes but is not limited to any one of stainless steel, titanium alloy, aluminum alloy, graphite, and composite graphite resin materials, and can be manufactured by stamping, rolling, and etching processes.

[0025] When the rectangular plate substrate is made of metal, the pole frame and the main plate can be formed by an integrated machining process or a lower-cost split welding process (the pole frame is made by machining and the main plate is made by stamping).

[0026] The rectangular electrode plate is suitable for any one of an alkaline electrolyzer, a proton exchange membrane electrolyzer, and a solid oxide electrolyzer.

[0027] As described above, the present invention has the following beneficial effects:

[0028] 1. The electrode plate of the present invention adopts a rectangular structure, thereby solving the problem of large gas production and low electrolysis efficiency of existing high-power electrolyzers, and the position arrangement of each functional area of ​​the rectangular electrode plate flow field is unique, wherein the cathode shunt area and the confluence area are independently arranged in parallel, and at the same time, a separate outflow manifold is connected, the medium is evenly distributed, the gas production is collected quickly, and the drainage effect is good; the anode shunt area and the confluence area are independently arranged in parallel, and at the same time, a separate outflow manifold is connected, which is conducive to saving electrode space and increasing the proportion of effective area;

[0029] 2. The "net-shaped cross groove flow path" constructed by the boss array on the main plate of the rectangular plate of the present invention has strong transient disturbance characteristics, which is conducive to the rapid shedding of bubble microclusters generated on the surface of the diaphragm, and the electrolysis efficiency is high;

[0030] 3. The plate structure of the present invention is simple. In the process of manufacturing electrodes, diaphragms and main plates, there is no need to cut them into round shapes, so the material loss is small and the material cost is low.

[0031] 4. The electrode plate of the present invention has more excellent current conduction, electrical conduction, mass transfer, heat transfer and gas conduction effects, and is easy to process and shape, with low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a rectangular plate (cathode side) for a high-power electrolytic cell provided by the present invention.

[0033] Figure 2 A schematic diagram of a rectangular plate (anode side) for a high-power electrolytic cell provided by the present invention.

[0034] Figure 3 Schematic diagram of cathode flow path of the present invention.

[0035] Figure 4 Schematic diagram of the anode flow path of the present invention.

[0036] Figure 5 It is a schematic diagram of the active area boss structure in the rectangular plate of the present invention.

[0037] Figure 6 It is a schematic diagram of the split welding forming of the rectangular plate of the present invention.

[0038] In the figure: 11, inlet manifold; 12-1, 12-2, 12-3, 12-4, inlet manifold; 13-1, 13-2, 13-3, 13-4, cathode shunt area; 14, cathode active area; 15-1, 15-2, 15-3, 15-4, cathode confluence area; 16-1, 16-2, 16-3, 16-4, outlet manifold; 17, cathode outlet manifold; 21-1, 21-2, anode inlet manifold Mouth; 22-1, 22-2, anode shunt area; 23, anode active area; 24-1, 24-2, anode confluence area; 25-1, 25-2, anode outlet manifold; 3, "cross" shaped boss; 31, boss top surface; 32, boss side surface; 33, groove plane; 34, fillet; 41, 42, 43, 44, positioning hole; 5, guide ridge; 6, rectangular boss; 7, pole frame; 8, main pole plate; 9, weld. DETAILED DESCRIPTION

[0039] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings and examples. It should be noted that the specific implementation modes described here are only for illustrating and explaining the present invention, and are not limited to the present invention.

[0040] The present invention can reduce the material loss in the process of manufacturing the electrodes and diaphragms of the electrolytic cell; the reaction medium of the cathode and the anode has good uniform distribution consistency, the gas production is collected quickly, and the drainage effect is good; the mass transfer and exhaust capacity in the active area of ​​the main electrode plate is strong, and the heat exchange capacity is strong, which can effectively improve the performance of the electrolytic cell.

[0041] In the following embodiments, when the material of the plate substrate is metal, it can be stainless steel, titanium alloy, aluminum alloy, etc., and can be machined into one piece, or the pole frame can be machined and the main pole plate can be manufactured by etching combination process, or the pole frame can be machined and the main pole plate can be manufactured by stamping method and finally welded into one piece.

[0042] Furthermore, the geometric features of the bosses in the active area of ​​the main board can be in the shape of a cross, and can also be replaced by a circle, an ellipse, a diamond, etc. Example

[0043] like Figure 1 and 2 As shown, the present invention provides a rectangular electrode plate for a high-power electrolytic cell, the electrode plate is in a rectangular shape, the electrode plate body is composed of a pole frame 7 and a main pole plate 8, the main pole plate 8 is accommodated in the pole frame 7 to form an integrated type, and the front and back sides of the main pole plate 8 are respectively a cathode active area 14 and an anode active area 23; on the cathode side of the rectangular electrode plate, the upper and lower sides of the pole frame 7 are respectively arranged with a "single-inlet-single-outlet" passage, which together with the cathode active area 14 constitute a cathode flow path; on the anode side of the rectangular electrode plate, the upper and lower sides of the pole frame 7 are respectively arranged with a "double-inlet-double-outlet" passage, which together with the anode active area 14 constitute an anode flow path.

[0044] Positioning holes 41 , 42 , 43 , 44 are respectively arranged at the four corners of the pole frame 7 .

[0045] Cathode inlet and outlet passages are arranged on the upper and lower sides of the cathode active area 14 in the pole frame 7, respectively, and form a cathode flow path together with the cathode active area 14 between the two passages. The cathode inlet passage is provided with an inlet manifold 11, at least one inlet manifold 12-1, 12-2, 12-3, 12-4 and at least one cathode shunt area 13-1, 13-2, 13-3, 13-4; the cathode outflow passage is provided with at least one cathode confluence area 15-1, 15-2, 15-3, 15-4, at least one outflow manifold 16-1, 16-2, 16-3, 16-4 and a cathode outflow manifold 17.

[0046] Anode inlet and outlet passages are arranged on the upper and lower sides of the anode active area 23 in the pole frame 7, respectively, and form an anode flow path with the anode active area 23 between the two passages. The anode inlet passage is provided with anode inlet manifolds 21-1, 21-2 and anode shunt areas 22-1, 22-2; the anode outflow passage is provided with anode confluence areas 24-1, 24-2 and anode outflow manifolds 25-1, 25-2.

[0047] like Figure 3 As shown, the cathode shunt area 13-1, 13-2, 13-3, 13-4 is in the shape of a "cup-shaped mouth", connecting the inlet manifolds 12-1, 12-2, 12-3, 12-4 and the cathode active area 14, and a guide ridge 5 and a rectangular boss 6 are arranged in the "cup-shaped mouth" to play a role in uniformly shunting the reaction medium and structural support; wherein each shunt area is connected by a separate inlet manifold 12-1, 12-2, 12-3, 12-4, and each shunt area is relatively independent; The cathode confluence areas 15-1, 15-2, 15-3, 15-4 are in the shape of a "cup-shaped mouth", connecting the cathode active area 14 and the outlet manifolds 16-1, 16-2, 16-3, 16-4, and arranging guide ridges 5 and rectangular bosses 6 in the "cup-shaped mouth", which play the role of uniformly conducting the reaction medium, generating gas and structural support; wherein each confluence area is conducted by a separate outlet manifold 16-1, 16-2, 16-3, 16-4, and each confluence area is relatively independent.

[0048] The above-mentioned flow dividing area and flow converging area are in the shape of a "cup-shaped mouth", which is conducive to the uniform distribution of the reaction medium and the collection of the gas-liquid two-phase mixture.

[0049] like Figure 4 As shown, the anode shunt areas 22-1, 22-2 of the electrode plate are in the shape of a "trumpet", connecting the inlet manifolds 21-1, 21-2 and the anode active area 23, and the guide ridges 5 and linearly arranged rectangular bosses 6 that can evenly shunt the reaction medium and structural support are arranged in the "trumpet"; wherein each shunt area is connected by a separate inlet manifold 21-1, 21-2; the anode confluence areas 24-1, 24-2 of the main electrode plate are in the shape of a "trumpet", connecting the anode active area 23 and the outlet manifolds 25-1, 25-2, and the guide ridges 5 and linearly arranged rectangular bosses 6 that can evenly conduct the reaction medium and the generated gas are arranged in the "trumpet"; wherein each confluence area is independently connected to the outlet manifold 25-1, 25-2, and the confluence areas are relatively independent.

[0050] The shape of the diversion area and the confluence area is a "trumpet mouth", which is beneficial to saving plate space and increasing the proportion of effective area.

[0051] Preferably, the opening positions of the inlet manifold and the outlet manifold of the anode flow path are located in the annular blank area of ​​the inlet diversion manifold, which is conducive to the compact arrangement of the flow path.

[0052] The cathode active area 14 of the main electrode plate 8 is arranged with an array of "cross"-shaped bosses 3, and the mesh-like cross "grooves" between the bosses provide flow for the reaction medium and generated gas in the cathode active area 14.

[0053] The anode active area 23 of the main electrode plate is provided with an array of "cross"-shaped bosses 3, and the mesh-like cross "grooves" between the bosses are used for the flow of reaction medium and generated gas in the anode active area.

[0054] In the above-mentioned anode and cathode active areas, the conduction, electrical conduction and heat transfer characteristics of the plates can be optimized by changing the geometric features of the bosses and the arrangement of the arrays.

[0055] At the same time, the mesh-like cross "grooves" formed between the bosses are flow channels for the reaction medium and the generated gas, and their width can be adjusted by changing the row spacing and column spacing values ​​of the boss array; the flow path depth can be adjusted by changing the height value of the boss; the values ​​of the row spacing and column spacing of the bosses are set according to the mechanical and electrical characteristics of the electrode plate and the gas production rate requirements.

[0056] The "cross" boss array 3 arranged in the cathode active area 14 and the anode active area 23 is arranged in a staggered or sequential manner. The geometric characteristics of the bosses in the above-mentioned active areas and the arrangement spacing of the array are adjusted according to the working characteristics and structural mechanics requirements of the electrolytic cell. This embodiment adopts a staggered arrangement.

[0057] When the boss is a "X"-shaped boss, it has four edges and corners A, B, C, and D, and the cross-sectional shape is a "X" shape. The edge of the top surface of the boss and the junction of the side surface of the boss with the groove plane 33 are respectively provided with rounded corners; the longitudinal half-length a of the boss, the transverse half-length b, the height value h of the boss, and the ratio a / b of the longitudinal half-length a and the transverse half-length b of the boss are 0.1-10, and h is 1-30mm. In this embodiment, the ratio a / b is 1.78, and h is 5mm.

[0058] like Figure 6 As shown: Schematic diagram of split welding of rectangular plates. The low-cost split welding process is recommended for plate production. The pole frame 7 is produced by machining, and the main pole plate 8 is produced by stamping, and finally welded into one.

[0059] The passage flow of obtaining the rectangular plate using the above is:

[0060] On the cathode side, the inlet manifold is connected to the inlet manifold, and the reaction medium enters the inlet manifold from the inlet manifold, is divided when flowing through the cathode diversion area, and then flows through the cathode active area to perform electrolytic reaction under the external current; the reaction medium and the generated gas flow through the confluence area and the confluence manifold in turn, and then are discharged from the electrolytic cell through the cathode outlet manifold, so that the medium circulation flow in the cathode flow path realizes the form of "single inlet-single outlet";

[0061] On the anode side, the inlet manifold is directly connected to the anode diversion area, and the mainstream of the reaction medium directly enters the diversion area through the inlet manifold for distribution, and enters the active area. Under the action of the external current, an electrolytic reaction occurs, and the reaction medium and the generated gas merge in the confluence area, and then flow through the anode outlet manifold to discharge the electrolytic cell, so that the circulation flow of the medium in the anode flow path realizes the form of "double inlet and double outlet".

Claims

1. A rectangular plate for a high-power electrolytic cell, characterized in that: The plate is rectangular in shape. The plate body is composed of a pole frame (7) and a main pole plate (8). The main pole plate (8) is accommodated in the pole frame (7) to form an integrated structure. The front and back sides of the main pole plate (8) are respectively a cathode active area (14) and an anode active area (23). On the cathode side of the rectangular plate, the upper and lower sides of the pole frame (7) are respectively provided with a "single-inlet-single-outlet" passage, which together with the cathode active area (14) form a cathode flow path. On the anode side of the rectangular plate, the upper and lower sides of the pole frame (7) are respectively provided with a "double-inlet-double-outlet" passage, which together with the anode active area (23) form an anode flow path. Cathode inlet and outlet passages are arranged on the upper and lower sides of the cathode active area (14) in the pole frame (7), respectively, and together with the cathode active area (14) between the two passages, form a cathode flow path, wherein the cathode inlet passage is provided with an inlet manifold (11), at least one inlet manifold (12-1, 12-2, 12-3, 12-4) and at least one cathode shunt area (13-1, 13-2, 13-3, 13-4); the cathode outlet passage is provided with at least one cathode converging area (15-1, 15-2, 15-3, 15-4), at least one outlet manifold (16-1, 16-2, 16-3, 16-4) and a cathode outlet manifold (17); The cathode shunt area (13-1, 13-2, 13-3, 13-4) is in the shape of a "cup-shaped mouth" and is connected to the inlet manifold (12-1, 12-2, 12-3, 12-4) and the cathode active area (14). A guide ridge (5) and a rectangular boss (6) are arranged in the "cup-shaped mouth" to evenly shunt the reaction medium and provide structural support. Each shunt area is connected by a separate inlet manifold (12-1, 12-2, 12-3, 12-4), and each shunt area is relatively independent. The confluence area (15-1, 15-2, 15-3, 15-4) is in the shape of a "cup-shaped mouth", connecting the cathode active area (14) and the outlet manifold (16-1, 16-2, 16-3, 16-4), and a guide ridge (5) and a rectangular boss (6) are arranged in the "cup-shaped mouth", which play the role of uniformly conducting the reaction medium, generating gas and structural support; wherein each confluence area is conducted by a separate outlet manifold (16-1, 16-2, 16-3, 16-4), and each confluence area is relatively independent; Anode inlet and outlet passages are arranged on the upper and lower sides of the anode active area (23) in the pole frame (7), respectively, and together with the anode active area (23) between the two passages, form an anode flow path; the anode inlet passage is provided with two anode inlet manifolds (21-1, 21-2) and anode flow splitting areas (22-1, 22-2); the anode flow outflow passage is provided with an anode converging area (24-1, 24-2) and two anode flow outflow manifolds (25-1, 25-2); The anode flow splitter regions (22-1, 22-2) are in the shape of a "bell mouth", connecting the anode inlet manifolds (21-1, 21-2) and the anode active region (23), and a flow guide ridge (5) capable of evenly diverting the reaction medium and structural support and a linearly arranged rectangular boss (6) are arranged in the "bell mouth"; wherein each flow splitter region is connected by a separate anode inlet manifold (21-1, 21-2); the anode confluence regions (24-1, 24-2) are in the shape of a "bell mouth", connecting the anode active region (23) and the anode outlet manifolds (25-1, 25-2), and a flow guide ridge (5) capable of evenly conducting the reaction medium and the generated gas and a linearly arranged rectangular boss (6) are arranged in the "bell mouth"; wherein each confluence region is independently connected to the anode outlet manifolds (25-1, 25-2), and the confluence regions are relatively independent.

2. The rectangular plate for a high-power electrolytic cell according to claim 1, characterized in that: The inlet manifold (11) is connected to the inlet manifold (12-1, 12-2, 12-3, 12-4), and the reaction medium enters the inlet manifold from the inlet manifold, then flows through the cathode diversion area (13-1, 13-2, 13-3, 13-4) for diversion, and then flows through the cathode active area (14) to perform electrolytic reaction under the action of an external power supply; the reaction medium and the generated gas are collected in the cathode converging area (15-1, 15-2, 15-3, 15-4), and flow through the outlet manifold (16-1, 16-2, 16-3, 16-4) and the cathode outlet manifold (17) connected thereto, so that the medium circulation flow in the cathode flow path realizes the form of "single inlet-single outlet".

3. The rectangular plate for a high-power electrolytic cell according to claim 1, characterized in that: The cathode active area (14) in the main electrode plate (8) is provided with an array of "cross"-shaped bosses (3), and the mesh-shaped cross "grooves" between the bosses are provided for the flow of reaction medium and generated gas in the cathode active area (14).

4. The rectangular plate for a high-power electrolytic cell according to claim 1, characterized in that: The anode inlet manifold (21-1, 21-2) is directly connected to the anode flow distribution area (22-1, 22-2), and the main flow of the reaction medium directly enters the flow distribution area through the inlet manifold for distribution, and enters the anode active area (23), where an electrolytic reaction occurs under the action of an external power supply, and the reaction medium and the generated gas merge in the anode confluence area (24-1, 24-2), and then flow through the anode outlet manifold to be discharged from the electrolytic cell, so that the medium circulation flow in the anode flow path realizes the form of "double inlet and double outlet".

5. The rectangular plate for a high-power electrolytic cell according to claim 4, characterized in that: An array of "cross"-shaped bosses (3) is arranged in the anode active area (23) of the main pole plate (8), and mesh-shaped cross "grooves" between the bosses are used for the flow of reaction medium and generated gas in the anode active area.

6. The rectangular plate for a high-power electrolytic cell according to claim 3 or 5, characterized in that: The "cross" shaped boss (3) array is arranged in the cathode active area (14) and the anode active area (23), and the array arrangement form is a cross-row or a straight row; the "cross" shaped boss (3) has four edges and corners A, B, C, and D, and the cross-sectional shape is a "cross" shape. The ratio a / b of the longitudinal half length a and the transverse half length b of the boss is 0.1-10, and the height value h of the boss is 1-30 mm.

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