Diversion type flow field assembly and alkaline water electrolytic bath with same

Abstract

The invention relates to the technical field of electrolytic hydrogen production equipment, and discloses a flow guide type flow field assembly and an alkaline water electrolytic bath with the flow guide type flow field assembly. The flow guide type flow field assembly comprises a polar plate, a concave cavity is formed in one side plate face of the polar plate, and a plurality of liquid inlets are formed in the bottom of the polar plate and used for allowing electrolyte to flow into the concave cavity; the top of the polar plate is provided with a liquid outlet for the electrolyte to flow out of the concave cavity; a plurality of planning belts are arranged in the concave cavity, the plurality of planning belts are sequentially arranged at intervals from left to right so as to form a plurality of flow channels, and the plurality of flow channels are in one-to-one correspondence with the plurality of liquid inlets so as to be used for guiding electrolyte flowing in from the plurality of liquid inlets in the direction towards the liquid outlet; according to the diversion type flow field assembly provided by the invention, non-uniform phenomena such as back-mixing and retention of the electrolyte in the concave cavity are effectively reduced, so that adverse effects caused by the non-uniform phenomena are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production equipment, and in particular to a flow-guiding flow field component and an alkaline water electrolyzer having the same. Background Art

[0002] Among the technologies involved in hydrogen production through water electrolysis, alkaline water electrolysis has gained widespread application due to its mature technology, low cost, and suitability for large-scale commercial production. The basic principle of alkaline water electrolysis is to pass direct current between the cathode and anode of an electrolyzer, causing water molecules in the electrolyte to undergo an electrochemical reaction at the electrodes to produce hydrogen and oxygen. To ensure the reaction continues, the electrolyzer is equipped with a liquid inlet and outlet to allow the electrolyte to flow continuously through the cell.

[0003] In the prior art, with the continuous development of high-power water electrolysis technology, the adverse effects of electrolyte back-mixing, retention and other uneven phenomena on the electrolysis process in the electrolyzer have become increasingly prominent. Specifically, the back-mixing phenomenon will cause some electrolyte that will not have time to participate in the electrolysis reaction to flow out of the electrolyzer, resulting in a decrease in electrolysis efficiency and affecting the gas yield; the retention of the electrolyte in the electrolyzer may accumulate impurities or bubbles in the retention area, causing interference with the normal progress of the electrolysis reaction. In addition, the retention of the electrolyte will also cause corrosion and damage to the equipment, increasing maintenance costs and downtime. It can be seen from this that how to optimize the structure of the existing electrolyzer to improve the electrolyte retention, back-mixing and other uneven phenomena in the electrolyzer is crucial to improving the stability of large-scale alkaline water electrolyzers and the efficiency of electrolytic hydrogen production. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of uneven phenomena such as back-mixing and retention of electrolyte in the electrolytic cell, which in turn brings adverse effects. A flow-guiding flow field component and an alkaline water electrolytic cell having the same are provided. The flow-guiding flow field component can improve the uneven phenomena such as back-mixing and retention of electrolyte when it flows through the electrolytic cell.

[0005] To achieve the above objectives, the present invention provides, on one hand, a flow-guiding flow field assembly, comprising an electrode plate, wherein a concave cavity is provided on one side of the electrode plate, a plurality of liquid inlets are provided at the bottom of the electrode plate for electrolyte to flow into the concave cavity, and a liquid outlet is provided at the top of the electrode plate for electrolyte to flow out of the concave cavity;

[0006] A plurality of planning belts are provided in the concave cavity, and the plurality of planning belts are arranged in sequence from left to right at intervals to form a plurality of flow channels, and the plurality of flow channels correspond one-to-one to the plurality of liquid inlets to guide the electrolyte flowing into the plurality of liquid inlets in the direction toward the liquid outlet.

[0007] Optionally, the cavity of the electrode plate is disc-shaped, and the multiple planning bands include a central planning band and multiple side planning bands, the central planning band passes through the center of the cavity and extends in the vertical direction, and the multiple side planning bands are spaced apart on both sides of the central planning band and are symmetrically arranged in pairs about the central planning band.

[0008] Optionally, the side planning band is an elliptical arc with a concave surface facing the center of the cavity.

[0009] Optionally, the side planning belt is straight.

[0010] Optionally, the heights of the multiple planned belts are all lower than the depth of the cavity.

[0011] Optionally, a plurality of liquid outlets are provided, and the plurality of liquid outlets are sequentially and spaced apart from each other on the top of the electrode plate.

[0012] Optionally, a plurality of liquid inlet guiding devices are provided at the bottom of the electrode plate, and the plurality of liquid inlet guiding devices correspond one-to-one to the plurality of liquid inlets so as to guide the electrolyte flowing into the concave cavity from each of the liquid inlets upward.

[0013] Optionally, the liquid inlet guiding device is configured to guide the electrolyte flowing into the cavity from each of the liquid inlets toward the center of the cavity.

[0014] Optionally, the liquid inlet guiding device includes two parallel and spaced-apart guide plates, and the liquid inlet is arranged between the two guide plates so that the flow direction of the electrolyte can be restricted by the two guide plates.

[0015] A second aspect of the present invention provides an alkaline water electrolyzer having the above-mentioned flow-guiding flow field assembly.

[0016] Through the above technical solution, the present invention arranges multiple planning belts in the concave cavity of the electrode plate, uses the multiple planning belts to plan flow channels corresponding to each liquid inlet in the concave cavity, and uses the flow channels to guide the electrolyte entering the concave cavity through the liquid inlet in the direction toward the liquid outlet, thereby effectively reducing the uneven phenomenon of electrolyte back mixing, retention, etc. in the concave cavity, thereby effectively reducing the adverse effects caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a flow-guiding flow field assembly provided in Example 1 of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a flow-guiding flow field assembly provided in Example 2 of the present invention;

[0019] Figure 3This is a schematic structural diagram of a flow-guiding flow field assembly provided in Example 3 of the present invention;

[0020] Figure 4 Schematic diagram of a verification system for simulating the flow state of an electrolyte in a flow-guiding flow field assembly provided by the present invention;

[0021] Figure 5 This is a photograph of the flow-guiding flow field assembly provided in Example 1 after 150 seconds according to the liquid inlet method 1;

[0022] Figure 6 This is a photograph of the flow-guiding flow field assembly provided in Example 2 after 150 seconds according to the liquid inlet method 1;

[0023] Figure 7 This is a photograph of the flow-guiding flow field assembly provided in Example 3 after 150 seconds according to the liquid inlet method 1;

[0024] Figure 8 This is a photograph of the flow state of the flow-guiding flow field assembly provided in Example 1 after 150 seconds according to the liquid inlet conditions of Experimental Examples 1-4;

[0025] Figure 9 This is a photograph of the flow state of the diversion type flow field assembly provided in Example 2 after 150 seconds according to the liquid inlet conditions of Experimental Examples 1-4;

[0026] Figure 10 This is a photograph of the flow state of the guide flow field component provided in Example 3 after 150 seconds according to the liquid inlet conditions of Test Examples 1-4.

[0027] Description of Reference Numerals

[0028] 1. Pure water storage tank; 2. Fluorescent dye storage tank; 3. Pump; 4. Controller; 5. Camera; 6. Ultraviolet lamp; 10. Plate; 101. Liquid inlet; 102. Liquid outlet; 103. Flow channel; 11. Concave cavity; 20. Central planning belt; 30. Side planning belt; 31. First elliptical arc planning belt; 32. Second elliptical arc planning belt; 33. Third elliptical arc planning belt; 34. First linear side planning belt; 35. Second linear side planning belt; 36. Third linear side planning belt; 37. Fourth linear side planning belt; 38. Fifth linear side planning belt; 39. Sixth linear side planning belt; 40. Liquid inlet guide device; 41. Guide plate. DETAILED DESCRIPTION

[0029] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0030] As mentioned above, combined with Figure 1 As shown, the present invention provides a guide flow field component, which includes a plate 10, a concave cavity 11 is provided on one side surface of the plate 10, a plurality of liquid inlets 101 are provided at the bottom of the plate 10 for electrolyte to flow into the concave cavity 11, and a liquid outlet 102 is provided at the top of the plate 10 for electrolyte to flow out of the concave cavity 11; a plurality of planning belts are provided in the concave cavity 11, and the plurality of planning belts are arranged in sequence from left to right at intervals to form a plurality of flow channels 103, and the plurality of flow channels 103 correspond one-to-one to the plurality of liquid inlets 101 to guide the electrolyte flowing into the plurality of liquid inlets 101 in the direction toward the liquid outlet 102.

[0031] In the technical solution provided by the present invention, a plurality of planning bands are provided in the concave cavity 11 of the electrode plate 10, and a flow channel 103 corresponding to each liquid inlet 101 is planned in the concave cavity 11 using the plurality of planning bands. The electrolyte entering the concave cavity 11 through the liquid inlet 101 is guided in the direction toward the liquid outlet 102 using the flow channel 103, thereby effectively reducing the uneven phenomenon such as back mixing and retention of the electrolyte in the concave cavity 11, thereby effectively reducing the adverse effects caused thereby.

[0032] In the present invention, the electrolyte may be one commonly used by those skilled in the art, for example, a 30% KOH solution or a 25% NaOH solution commonly used by those skilled in the art.

[0033] It can be understood that in the present invention, by providing multiple liquid inlets 101, the uniformity of the distribution of the electrolyte in the concave cavity 11 can be improved to a certain extent. For example, in a specific embodiment of the present invention, there are eight liquid inlets 101, and the central angle of the concave cavity 11 corresponding to two adjacent liquid inlets 101 is 15°.

[0034] In the present invention, the planning bands may adopt any appropriate structural form, as long as a flow channel 103 corresponding to each liquid inlet 101 can be planned and formed in the cavity 11 to guide as much electrolyte flowing into the liquid inlet 101 as possible in the direction toward the liquid outlet 102. In some embodiments, the cavity 11 of the electrode plate 10 is disc-shaped, and the multiple planning bands include a central planning band 20 and multiple side planning bands 30. The central planning band 20 passes through the center of the cavity 11 and extends in the vertical direction. The multiple side planning bands 30 are spaced apart and distributed on both sides of the central planning band 20 and are symmetrically arranged with respect to the central planning band 20.

[0035] In some embodiments, combined Figure 1As shown, the side planning band 30 is an elliptical arc with the concave surface facing the center of the cavity 11. It should be noted that in the present invention, the structure of the elliptical arc side planning band 30 is adaptively selected according to the size of the electrode plate 10 and the number of the liquid inlet 101.

[0036] In some embodiments, combined Figure 2 and Figure 3 As shown, the side planning belt 30 is a straight line.

[0037] In some embodiments, the heights of the plurality of planned strips are all lower than the depth of the cavity 11. It is understood that, through the above-described structural arrangement, the electrolytes in different flow channels 103 can be mixed, thereby minimizing the effect of the flow channels 103 on the uniformity of the electrolyte in the entire cavity 11 while guiding the electrolyte as a whole toward the liquid outlet 102 through the flow channels 103.

[0038] For example, in a specific embodiment of the present invention, the depth of the cavity 11 is 5 mm, and the height of the planning band is 4 mm, that is, there is a gap of 1 mm to enable the electrolyte to flow between different flow channels 103 .

[0039] In some embodiments, a plurality of liquid outlets 102 are provided, and the plurality of liquid outlets 102 are sequentially and spaced apart from each other on the top of the electrode plate 10. It will be appreciated that the plurality of liquid outlets 102 can enable the electrolyte that has completed the electrolysis reaction to flow out of the cavity 11 more quickly, thereby preventing the electrolyte that has completed the electrolysis reaction from mixing and being retained in the cavity 11. Exemplarily, four liquid outlets 102 are provided, and the four liquid outlets 102 are sequentially and spaced apart from each other on the top of the electrode plate 10.

[0040] In some embodiments, a plurality of liquid inlet guiding devices 40 are provided at the bottom of the electrode plate 10 , and the plurality of liquid inlet guiding devices 40 correspond one-to-one to the plurality of liquid inlets 101 to guide the electrolyte flowing into the cavity 11 from each liquid inlet 101 upward.

[0041] In some embodiments, combined Figure 1 and Figure 2 As shown, the liquid inlet guiding device 40 is configured to guide the electrolyte flowing into the cavity 11 from each of the liquid inlets 101 toward the center of the cavity 11 .

[0042] In the present invention, the liquid inlet guiding device 40 may adopt any appropriate structural form, as long as it can guide the flow direction of the electrolyte flowing into the concave cavity 11 from the liquid inlet 101. In some embodiments, the liquid inlet guiding device 40 includes two parallel and spaced guide plates 41, and the liquid inlet 101 is disposed between the two guide plates 41 so that the flow direction of the electrolyte can be restricted by the two guide plates 41.

[0043] The flow-guiding flow field assembly provided by the present invention is further described below through specific embodiments.

[0044] Example 1

[0045] Combine Figure 1 As shown, the flow-guiding flow field assembly includes a plate 10, and a cavity 11 with a depth of 5 mm is provided on one side of the plate surface of the plate 10. The cavity 11 is disc-shaped and has a diameter of 1940 mm.

[0046] Eight liquid inlets 101 are provided at the bottom of the electrode plate 10 for the electrolyte to flow into the concave cavity 11. For the convenience of subsequent description, the eight liquid inlets 101 are numbered 1#, 2#, 3#, ..., 7#, 8# from left to right; the diameter of each liquid inlet 101 is 10 mm, and the distance from the center of the concave cavity 11 is 900 mm. The central angle of the corresponding concave cavity 11 between two adjacent liquid inlets 101 is 15°. Each liquid inlet 101 is provided with a liquid inlet guiding device 40, which is used to guide the electrolyte flowing into the concave cavity 11 from the corresponding liquid inlet 101 toward the center position of the concave cavity 11.

[0047] Four liquid outlets 102 are provided on the top of the electrode plate 10 to allow the electrolyte to flow out of the cavity 11 .

[0048] Seven planning belts are provided in the concave cavity 11, including a central planning belt 20 and six side planning belts 30. The central planning belt 20 passes through the center of the concave cavity 11 and extends in the vertical direction. The six side planning belts 30 are spaced apart on both sides of the central planning belt 20 and are symmetrically arranged with respect to the central planning belt 20. The side planning belts 30 are all elliptical arcs with the concave surface facing the center of the concave cavity 11.

[0049] The length of the central planning belt 20 is 1500 mm and the width is 10 mm;

[0050] On one side of the central planning zone 20 , there are sequentially formed a first elliptical arc-shaped planning zone 31 , a second elliptical arc-shaped planning zone 32 and a third elliptical arc-shaped planning zone 33 in a direction away from the central planning zone 20 .

[0051] The short axis length of the ellipse corresponding to the first elliptical arc planning band 31 is 235 mm, and the long axis length is 1940 mm. The lowest position of the first elliptical arc planning band 31 is flush with the liquid inlet 101 on its left side and the horizontal distance is 150 mm. The vertical distance between the highest position of the first elliptical arc planning band 31 and the lowest position of the electrode plate 10 is 1548 mm.

[0052] The minor axis length of the ellipse corresponding to the second elliptical arc-shaped planning band 32 is 470 mm, and the major axis length is 1940 mm. The lowest position of the second elliptical arc-shaped planning band 32 is flush with the liquid inlet 101 on its left side and the horizontal distance is 150 mm. The vertical distance between the highest position of the second elliptical arc-shaped planning band 32 and the lowest position of the electrode plate 10 is 1548 mm.

[0053] The short axis length of the ellipse corresponding to the third elliptical arc planning band 33 is 705 mm, and the long axis length is 1940 mm. The lowest position of the third elliptical arc planning band 33 is flush with the liquid inlet 101 on its left side and the horizontal distance is 100 mm; the vertical distance between the highest position of the third elliptical arc planning band 33 and the lowest position of the electrode plate 10 is 1548 mm.

[0054] The width of the first elliptical arc-shaped planning zone 31 , the second elliptical arc-shaped planning zone 32 and the third elliptical arc-shaped planning zone 33 are all 10 mm.

[0055] Example 2

[0056] The structure of the flow field assembly provided in this embodiment is basically the same as that in embodiment 1, except that: Figure 2 As shown, the side planning belts 30 on both sides of the central planning belt 20 are all linear. On one side of the central planning belt 20, along the direction away from the central planning belt 20, there are the first linear side planning belt 34, the second linear side planning belt 35, and the third linear side planning belt 36; the length of the first linear side planning belt 34 is 1400mm, and the lowest position of the first linear side planning belt 34 is flush with the liquid inlet 101 on its left side and the horizontal distance is 150mm; the second linear side planning belt 34 is 1400mm long. The length of the marking strip 35 is 1200 mm, and the lowest position of the second linear side planning strip 35 is flush with the liquid inlet 101 on its left side and the horizontal distance is 150 mm; the length of the third linear side planning strip 36 is 1000 mm, and the lowest position of the third linear side planning strip 36 is flush with the liquid inlet 101 on its left side and the horizontal distance is 100 mm; the width of the first linear side planning strip 34, the second linear side planning strip 35, and the third linear side planning strip 36 is 20 mm.

[0057] The three linear side planning belts located on the other side of the central planning belt 20 are symmetrically arranged with respect to the central planning belt 20 , respectively, with respect to the first linear side planning belt 34 , the second linear side planning belt 35 , and the third linear side planning belt 36 .

[0058] Example 3

[0059] The structure of the flow field assembly provided in this embodiment is basically the same as that provided in embodiment 2, except that: Figure 3 As shown, on one side of the central planning band 20, along the direction away from the central planning band 20, there are the fourth linear side planning band 37, the fifth linear side planning band 38, and the sixth linear side planning band 39; the length of the fourth linear side planning band 37 is 1530 mm, the length of the fifth linear side planning band 38 is 1450 mm, and the length of the sixth linear side planning band 39 is 1300 mm. The lower ends of the fourth linear side planning band 37, the fifth linear side planning band 38 and the sixth linear side planning band 39 all extend to the edge of the electrode plate 10.

[0060] The three linear side planning belts located on the other side of the central planning belt 20 are symmetrically arranged with respect to the central planning belt 20 , respectively, along with the fourth linear side planning belt 37 , the fifth linear side planning belt 38 , and the sixth linear side planning belt 39 .

[0061] In order to verify the improvement effect of the flow field assembly provided by the present invention on the flow state of the electrolyte. The present invention also provides a verification system for simulating the flow state of the electrolyte in the flow field assembly, such as Figure 4 As shown, the verification system includes a pure water storage tank 1, a fluorescent dye storage tank 2, a pump 3, a controller 4, a camera 5, and an ultraviolet lamp 6; wherein the controller 4 can control the pump 3 to pump the pure water in the pure water storage tank 1 and the fluorescent dye in the fluorescent dye storage tank 2 independently at a certain flow rate and flow rate into the guide flow field component of the present invention, and the liquid flows into the concave cavity 11 from the eight liquid inlets 101 at the bottom of the electrode plate 10, flows through the concave cavity 11 vertically from bottom to top, and flows out of the concave cavity 11 from the four liquid outlets 102 at the top of the electrode plate 10.

[0062] During actual verification, pure water is first introduced to fill the cavity 11. After reaching a stable flow, fluorescent dye is introduced at the same flow rate. The ultraviolet lamp 6 is turned on under dark conditions, and photos are taken through the camera 5 to observe and record the flow distribution of the fluorescent dye in the cavity 11, thereby simulating the flow state of the electrolyte in the diversion flow field component.

[0063] Furthermore, in order to fully consider the influence of flow rate on the flow state of the electrolyte in the cavity 11, the present invention also provides two liquid inlet methods, specifically:

[0064] Liquid Inlet Method 1: The flow rate of each liquid inlet remains unchanged, and the total liquid inlet volume is adjusted. The specific liquid inlet conditions of this liquid inlet method are shown in Table 1 below, where the unit of the liquid inlet flow rate of a single liquid inlet is L / min.

[0065] Table 1:

[0066]

[0067] like Figure 5 The figure shows a photo of the flow field assembly provided in Example 1 after 150 seconds according to the liquid feeding method. Figure 6 The figure shows a photo of the flow field assembly provided in Example 2 after 150 seconds according to the liquid feeding method. Figure 7 Shown is a photograph of the guide flow field assembly provided in Example 3 after 150 seconds according to liquid inlet method one.

[0068] As can be seen from the photos, the fluorescent dye entering the flow-guiding flow field assembly provided by the present invention is fully mixed at low flow rates, aggregated into a single unit, and pushed upwards, uniformly filling the entire plate without noticeable eddies or stagnant areas. Although some small eddies and some uneven flow conditions persist at high flow rates, some faster-flowing liquid remains largely within the planned flow path and does not diffuse into other channels, thereby affecting the overall flow.

[0069] Liquid inlet method 2: The total liquid inlet volume remains unchanged at 360L / h, and the flow rate of each liquid inlet is adjusted.

[0070] As shown in Table 2 below, this liquid inlet method includes four test cases, namely Test Cases 1, 2, 3, and 4. The unit of the liquid inlet flow rate for a single liquid inlet is L / min. For example, in Test Case 1, the liquid inlet flow rates for inlets 1#-8# were 0.3 L / min, 0.6 L / min, 0.9 L / min, 1.2 L / min, 1.2 L / min, 0.9 L / min, 0.6 L / min, and 0.3 L / min, respectively. Liquid was introduced into the flow-guiding flow field assembly provided in Example 1 according to these inlet conditions, and the flow state of the fluorescent dye was observed and recorded.

[0071] Table 2:

[0072]

[0073] The flow-guiding flow field assemblies provided in Examples 1-3 were all filled with liquid according to the liquid filling conditions of Experimental Examples 1-4 in Table 2, and the flow states of the fluorescent dyes in the flow-guiding flow field assemblies provided in Examples 1-3 under different liquid filling conditions were obtained.

[0074] like Figure 8 The figure shows the flow state of the flow field assembly provided in Example 1 after 150 seconds according to the liquid inlet conditions of Experimental Examples 1-4; Figure 9 The figure shows the flow state of the flow field assembly provided in Example 1 after 150 seconds according to the liquid inlet conditions of Experimental Examples 1-4; Figure 10 Shown is a photograph of the flow state of the guide flow field assembly provided in Example 1 after 150 seconds according to the liquid inlet conditions of Experimental Examples 1-4.

[0075] As can be seen from the photos, in this liquid inlet method, except for Test Example 1, the other three tests all showed uneven flow. The inventor speculates that in this liquid inlet method, the total liquid inlet volume of 360L / h belongs to a high flow state. Therefore, only by concentrating the high flow inlet at the center of the electrode plate in Test Example 1 can the liquid be ensured to be evenly distributed in the cavity; in addition, the electrode plate under the test conditions may also have expansion problems, resulting in the inability to effectively ensure that the liquid in each liquid inlet is confined to the corresponding flow channel, especially the test error in the center part of the electrode plate is large.

[0076] A second aspect of the present invention provides an alkaline water electrolyzer having the aforementioned flow-guiding flow field assembly. In the present invention, the alkaline water electrolyzer having the aforementioned flow-guiding flow field assembly allows the electrolyte flowing into the concave cavity 11 through the liquid inlet 101 to be guided toward the liquid outlet 102 , effectively reducing uneven electrolyte mixing, retention, and other phenomena within the concave cavity 11 , thereby reducing the adverse effects thereof and enabling large-scale alkaline water electrolyzers to have better stability and higher hydrogen production efficiency through electrolysis.

[0077] While the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited thereto. Within the technical scope of the present invention, various simple variations of the technical solution of the present invention may be made. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed herein and fall within the scope of protection of the present invention.

Claims

1. A flow-guiding flow field component, characterized in that: The invention comprises an electrode plate (10), wherein a concave cavity (11) is provided on one side surface of the electrode plate (10), a plurality of liquid inlets (101) are provided at the bottom of the electrode plate (10) for electrolyte to flow into the concave cavity (11), and a liquid outlet (102) is provided at the top of the electrode plate (10) for electrolyte to flow out of the concave cavity (11); A plurality of planning belts are provided in the concave cavity (11), and the plurality of planning belts are sequentially arranged at intervals from left to right to form a plurality of flow channels (103). The plurality of flow channels (103) correspond one-to-one to the plurality of liquid inlets (101) to guide the electrolyte flowing into the plurality of liquid inlets (101) in a direction toward the liquid outlet (102).

2. The flow-guiding flow field assembly according to claim 1, characterized in that: The concave cavity (11) of the electrode plate (10) is disc-shaped, and the multiple planning bands include a central planning band (20) and multiple side planning bands (30). The central planning band (20) passes through the center of the concave cavity (11) and extends in a vertical direction. The multiple side planning bands (30) are distributed at intervals on both sides of the central planning band (20) and are symmetrically arranged in pairs with respect to the central planning band (20).

3. The flow-guiding flow field assembly according to claim 2, characterized in that: The side planning band (30) is in the shape of an elliptical arc with the concave surface facing the center of the cavity (11).

4. The flow-guiding flow field assembly according to claim 2, characterized in that: The side planning belt (30) is in a straight line shape.

5. The flow-guiding flow field assembly according to claim 1, characterized in that: The heights of the multiple planning belts are all lower than the depth of the cavity (11).

6. The flow-guiding flow field assembly according to claim 1, characterized in that: A plurality of liquid outlets (102) are provided, and the plurality of liquid outlets (102) are sequentially and spaced apart from each other on the top of the electrode plate (10).

7. The flow-guiding flow field assembly according to any one of claims 1 to 6, characterized in that: A plurality of liquid inlet guiding devices (40) are provided at the bottom of the electrode plate (10), and the plurality of liquid inlet guiding devices (40) correspond one-to-one to the plurality of liquid inlets (101) so as to guide the electrolyte flowing into the concave cavity (11) from each of the liquid inlets (101) upward.

8. The flow-guiding flow field assembly according to claim 7, characterized in that: The liquid inlet guiding device (40) is configured to guide the electrolyte flowing into the cavity (11) from each of the liquid inlets (101) toward the center of the cavity (11).

9. The flow-guiding flow field assembly according to claim 7, characterized in that: The liquid inlet guiding device (40) comprises two parallel and spaced guide plates (41), and the liquid inlet (101) is arranged between the two guide plates (41) so that the flow direction of the electrolyte can be restricted by the two guide plates (41).

10. An alkaline water electrolyzer, characterized in that: The alkaline water electrolyzer comprises the flow-guiding flow field assembly according to any one of claims 1 to 9.

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