Bipolar plate, end plate and alkaline electrolyzer

Abstract

The present application provides a bipolar plate, an end plate and an alkaline electrolyzer. The positions of a first alkali liquor inlet through hole group and a second alkali liquor inlet through hole group are rationally arranged at the bottom of an electrode frame, such that when the bipolar plate is applied to the alkaline electrolyzer, alkali liquor firstly enters a first alkali liquor inlet channel formed by first through holes of the first alkali liquor inlet through hole group and a second alkali liquor inlet channel formed by first through holes of the second alkali liquor inlet through hole group from one end of the alkaline electrolyzer. After arriving at the other end of the alkaline electrolyzer, the alkali liquor enters individual electrolysis cells from second through holes of the first alkali liquor inlet through hole group and second through holes of the second alkali liquor inlet through hole group, so as to realize uniform distribution of the alkali liquor, and solves the problem of the uneven distribution of the alkali liquor caused by the excess length of an electrolyzer body of a large alkaline electrolyzer, thus preventing the operating conditions of the alkaline electrolyzer from getting worse, improving the efficiency of hydrogen production, and finally achieving the purpose of saving the electric energy consumption of the alkaline electrolyzer.

Description

Bipolar plates, end plates and alkaline electrolyzers

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202322307789.2 filed with the Chinese Patent Office on August 28, 2023, entitled “Bipolar Plate, End Plate and Alkaline Electrolyzer,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of hydrogen production by electrolysis of water, and in particular to a bipolar plate, an end plate and an alkaline electrolyzer. Background Art

[0004] As an important component of clean energy, hydrogen energy is in a period of rapid industrial development. The corresponding water electrolysis hydrogen production equipment is developing towards large-scale. At present, hydrogen is generally produced by electrolysis of water. Alkaline electrolyzers are the key equipment for electrolysis of water to produce hydrogen. With the increase in the scale of hydrogen production, alkaline electrolyzers are also gradually developing towards large-scale.

[0005] Industrial alkaline electrolyzers are generally composed of multiple stacked electrolysis chambers, with a single alkali inlet providing the required alkali solution. This liquid supply structure is suitable for small and medium-sized alkaline electrolyzers. However, as alkaline water electrolyzers become larger, the end diameter of the alkaline electrolyzer also increases, which inevitably requires a significant increase in the number of electrolysis chambers. The longer the alkaline electrolyzer body, the longer the alkaline electrolyzer body. Although a single alkali inlet can provide the amount of alkali solution used for hydrogen production, it cannot ensure uniform heat and mass transfer distribution during the circulation of the alkali solution. The increase in the number of electrolysis chambers causes the uniformity of the flow field in the alkaline electrolyzer to deteriorate, the temperature difference between the electrolysis chambers increases, the resistance to electrolyte flow increases, and the operating state of the alkaline electrolyzer deteriorates. Therefore, as the volume of the cell body increases, the internal temperature and mass transfer of the alkaline electrolyzer become more significant.

[0006] Summary of the Invention

[0007] The purpose of the present application is to provide a bipolar plate, an end plate and an alkaline electrolytic cell to solve the technical problem in the prior art that the large-scale alkaline electrolytic cell will inevitably greatly increase the number of electrolytic chambers. The more the number of electrolytic chambers increases, the longer the alkaline electrolytic cell body becomes, which causes the uniformity of the flow field in the alkaline electrolytic cell to deteriorate, and the operating state of the alkaline electrolytic cell to deteriorate.

[0008] To achieve the above objectives, the present application provides a bipolar plate, comprising:

[0009] The bipolar plate body is a square structure and includes an anode surface and a cathode surface set opposite to each other; a pole frame is fixedly arranged around the bipolar plate; a first alkali liquid inlet through hole group and a second alkali liquid inlet through hole group, both of which are arranged through the lower part of the pole frame along the thickness direction of the pole frame; wherein each group of alkali liquid inlet through hole groups includes a first through hole and a second through hole; wherein the second through hole of the first alkali liquid inlet through hole group is connected to the anode surface, and the first through hole of the first alkali liquid inlet through hole group is not connected to the bipolar plate body; the second through hole of the second alkali liquid inlet through hole group is connected to the cathode surface, and the first through hole of the second alkali liquid inlet through hole group is not connected to the bipolar plate body; and a first gas-liquid mixing through hole and a second gas-liquid mixing through hole, both of which are arranged through the upper part of the pole frame along the thickness direction of the pole frame, wherein the first gas-liquid mixing through hole is connected to the anode surface; the second gas-liquid mixing through hole is connected to the cathode surface.

[0010] Optionally, in the bipolar plate, the second through hole of the first alkali liquid inlet through hole group and the anode surface, the second through hole of the second alkali liquid inlet through hole group and the cathode surface, the first gas-liquid mixing through hole and the anode surface, and the second gas-liquid mixing through hole and the cathode surface are all connected through a connecting groove.

[0011] Optionally, in the bipolar plate, the connecting groove has a shape of any one of a rectangle, a waist, and a funnel.

[0012] Optionally, in the bipolar plate, a line connecting the center of the upper connecting groove and the center of the lower connecting groove on the cathode surface intersects with a side edge of the pole frame.

[0013] Optionally, in the bipolar plate, the number of first alkali liquid inlet through-hole groups is not less than the number of first gas-liquid mixing through-holes; and the number of second alkali liquid inlet through-hole groups is not less than the number of second gas-liquid mixing through-holes.

[0014] Optionally, in the bipolar plate, the first gas-liquid mixing through holes and the second gas-liquid mixing through holes are alternately arranged on the upper portion of the pole frame.

[0015] Optionally, in the bipolar plate, the number of the first alkali solution inlet through-hole groups is the same as the number of the second alkali solution inlet through-hole groups and they are arranged alternately.

[0016] On the other hand, the present application also provides an end plate, including a first end plate and a second end plate; an alkali liquid inlet corresponding to the first through hole in the above-mentioned bipolar plate, a first gas-liquid mixing outlet corresponding to the first gas-liquid mixing through hole in the bipolar plate, and a second gas-liquid mixing outlet corresponding to the second gas-liquid mixing through hole in the bipolar plate are provided on the first end plate; wherein the alkali liquid inlet is arranged at the lower part of the first end plate, and the first gas-liquid mixing outlet and the second gas-liquid mixing outlet are arranged at the upper part of the first end plate; a first groove corresponding to the first alkali liquid inlet through hole group in the bipolar plate and a second groove corresponding to the second alkali liquid inlet through hole group in the bipolar plate are provided at the bottom of the second end plate.

[0017] Optionally, in the end plate, the first gas-liquid mixed outlet and the second gas-liquid mixed outlet are alternately arranged on the upper part of the first end plate.

[0018] On the other hand, the present application also provides an alkaline electrolytic cell, comprising a plurality of the above-mentioned bipolar plates, the above-mentioned end plates, a diaphragm and relatively arranged positive plates and negative plates, wherein the plurality of the bipolar plates are arranged side by side and spaced apart between the positive plates and the negative plates, and a diaphragm is arranged between every two bipolar plates; the first alkali liquid inlet through-hole groups of the plurality of the bipolar plates and the first groove on the second end plate are interconnected to form a first alkali liquid inlet channel, and the second alkali liquid inlet through-hole groups of the plurality of the bipolar plates and the second groove on the second end plate are interconnected to form a second alkali liquid inlet channel; wherein an anode electrolysis chamber is formed between the anode surface of the bipolar plate and the diaphragm, and a cathode electrolysis chamber is formed between the cathode surface of the bipolar plate and the diaphragm.

[0019] Compared with the prior art, the present application provides a bipolar plate. By rationally arranging the positions of the first alkali liquid inlet through-hole group and the second alkali liquid inlet through-hole group at the bottom of the pole frame, when the bipolar plate is applied to an alkaline electrolytic cell, the alkali liquid first enters the first alkali liquid inlet channel formed by the first through-hole of the first alkali liquid inlet through-hole group and the second alkali liquid inlet through-hole channel formed by the first through-hole of the second alkali liquid inlet through-hole group from one end of the alkaline electrolytic cell. After reaching the other end of the alkaline electrolytic cell, the alkali liquid enters each electrolysis chamber through the second through-hole of the first alkali liquid inlet through-hole group and the second through-hole of the second alkali liquid inlet through-hole group to achieve uniform distribution of the alkali liquid, thus solving the problem of uneven alkali liquid distribution caused by the excessive length of the cell body in large alkaline electrolytic cells. This prevents the deterioration of the operating state of the alkaline electrolytic cell, improves the hydrogen production efficiency, and ultimately achieves the purpose of saving the power consumption of the alkaline electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a structural perspective view of a bipolar plate provided in an embodiment of the present application;

[0021] FIG2 is a structural diagram of the anode surface of a bipolar plate provided in an embodiment of the present application;

[0022] FIG3 is a structural diagram of the cathode surface of a bipolar plate provided in an embodiment of the present application;

[0023] FIG4 is a schematic structural diagram of a first end plate provided in an embodiment of the present application;

[0024] FIG5 is a schematic structural diagram of a second end plate provided in an embodiment of the present application;

[0025] FIG6 is a schematic structural diagram of an alkaline electrolytic cell provided in an embodiment of the present application.

[0026] The reference numerals in Figures 1 to 6 are as follows: 100 - bipolar plate; 110 - bipolar plate body; 111 - anode surface; 112 - cathode surface; 120 - pole frame; 121 - First alkali liquid inlet through hole group; 121a-first through hole of the first alkali liquid inlet through hole group; 121b-second through hole of the first alkali liquid inlet through hole group; 122-second alkali liquid inlet through hole group; 122a-first through hole of the second alkali liquid inlet through hole group; 122b-second through hole of the second alkali liquid inlet through hole group; 123-first gas-liquid mixing through hole; 124-second gas-liquid mixing through hole; 130-connecting groove; 210-first end plate; 211-first gas-liquid mixing outlet; 212-second gas-liquid mixing outlet; 213-alkali liquid inlet; 220-second end plate; 221-first groove; 222-second groove; 300-positive plate; 400-negative plate; 500-first alkali liquid inlet channel; 600-second alkali liquid inlet channel. DETAILED DESCRIPTION

[0027] To further clarify the objectives, advantages, and features of the present application, the bipolar plates, end plates, and alkaline electrolytic cell proposed in the present application are further described below in conjunction with Figures 1 to 6. It should be noted that the figures are all greatly simplified and not to exact scale, and are only used to facilitate and clearly illustrate the purpose of the embodiments of the present application.

[0028] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0030] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] In the description of the present application specification and the appended claims, the terms "first", "second", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0032] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0033] It should be noted that the orientations mentioned in the following embodiments are based on the alkaline electrolytic cell when it is placed in a working state.

[0034] Refer to Figures 1-3 in conjunction with Figure 6. The present application provides a bipolar plate 100, comprising: a bipolar plate body 110, a pole frame 120, a first alkali liquid inlet through-hole group 121, a second alkali liquid inlet through-hole group 122, a first gas-liquid mixing through-hole 123, and a second gas-liquid mixing through-hole 124. The bipolar plate body 110 is a square structure, and comprises an anode surface 111 and a cathode surface 112 arranged opposite to each other. The pole frame 120 is fixedly arranged around the bipolar plate 100. The first alkali liquid inlet through-hole group 121 and the second alkali liquid inlet through-hole group 122 are both arranged through the lower part of the pole frame 120 along the thickness direction of the pole frame 120. Each alkali liquid inlet through-hole group includes a first through-hole and a second through-hole. The second through-hole 121b of the first alkali liquid inlet through-hole group communicates with the anode surface 111, while the first through-hole 121a of the first alkali liquid inlet through-hole group does not communicate with the bipolar plate body 110. In other words, the first through-hole 121a of the first alkali liquid inlet through-hole group is not connected to the bipolar plate body 110. The second through-hole 122b of the second alkali liquid inlet through-hole group communicates with the cathode surface 112, while the first through-hole 122a of the second alkali liquid inlet through-hole group does not communicate with the bipolar plate body 110. In other words, the first through-hole 122a of the second alkali liquid inlet through-hole group is not connected to the bipolar plate body 110. The first gas-liquid mixing through-hole 123 and the second gas-liquid mixing through-hole 124 are both provided through the upper portion of the pole frame 120 along the thickness direction of the pole frame 120. The first gas-liquid mixing through-hole 123 communicates with the anode surface 111. The second gas-liquid mixing through hole 124 is in communication with the cathode surface 112 .

[0035] Through the above technical solution, the positions of the first alkali liquid inlet through hole group 121 and the second alkali liquid inlet through hole group 122 at the bottom of the pole frame 120 are reasonably arranged so that when the bipolar plate 100 is applied to the alkaline electrolytic cell, the alkali liquid first enters the first alkali liquid inlet channel 500 formed by the first through hole 121a of the first alkali liquid inlet through hole group and the second alkali liquid inlet channel 600 formed by the first through hole 122a of the second alkali liquid inlet through hole group from one end of the alkaline electrolytic cell. After reaching the other end of the alkaline electrolytic cell, it enters each electrolysis chamber through the second through hole 121b of the first alkali liquid inlet through hole group and the second through hole 122b of the second alkali liquid inlet through hole group to achieve uniform distribution of the alkali liquid, solving the problem of uneven distribution of the alkali liquid caused by the excessive length of the cell body of the large alkaline electrolytic cell. Thereby, the deterioration of the operating state of the alkaline electrolytic cell is prevented, the hydrogen production efficiency is improved, and the purpose of saving the power consumption of the alkaline electrolytic cell is ultimately achieved.

[0036] Specifically, by providing the first and second alkali solution inlet through-hole groups 121 and 122 at the lower portion of the pole frame 120 of the bipolar plate 100 of the alkaline electrolytic cell, the second through-hole 121b of the first alkali solution inlet through-hole group connects with the first through-hole 121a to form a U-shaped liquid inlet channel, through which the alkali solution enters the cathode electrolysis chamber. The second through-hole 122b of the second alkali solution inlet through-hole group connects with the first through-hole 122a to form a U-shaped liquid inlet channel, through which the alkali solution enters the anode electrolysis chamber. In this way, the cathode electrolysis chamber and the anode electrolysis chamber corresponding to the cathode surface 112 and the anode surface 111 of the bipolar plate 100 are evenly divided into multiple liquid inlet areas, thereby improving liquid inlet efficiency. This avoids problems such as insufficient water electrolysis in some areas due to uneven flow fields within the alkaline electrolytic cell, which can cause local failure of the bipolar plate body 110 and reduce the electrolysis efficiency and service life of the alkaline electrolytic cell.

[0037] It should be noted that the above-mentioned "second through hole 121b of the first alkali solution inlet through hole group" and "second through hole 122b of the second alkali solution inlet through hole group" are respectively opened on both sides of the pole frame 120, and are not connected to each other. Their main function is to transport the alkali solution introduced into the U-shaped liquid inlet channel formed along the axial direction to the electrolysis chambers on both sides of the bipolar plate 100, and in this process prevent the two electrolysis chambers on both sides of the bipolar plate 100 from interfering with each other and affecting the electrolysis reaction therein.

[0038] The second through hole 121b of the first alkali liquid inlet through hole group and the anode surface 111, the second through hole 122b of the second alkali liquid inlet through hole group and the cathode surface 112, the first gas-liquid mixing through hole 123 and the anode surface 111, and the second gas-liquid mixing through hole 124 and the cathode surface 112 are all connected through a connecting groove 130. Specifically, the shape of the connecting groove 130 is any one of a rectangle, a waist shape, and a funnel shape. It should be noted that the shape of the connecting groove 130 is not limited here, as long as the gas-liquid two-phase flow can quickly enter the first gas-liquid mixing through hole 123 and the second gas-liquid mixing through hole 124 through the connecting groove 130, and the alkali liquid in the first alkali liquid inlet through hole group 121 and the second alkali liquid inlet through hole group 122 can more evenly enter the anode electrolysis chamber and the cathode electrolysis chamber.

[0039] Specifically, the line connecting the center of the upper connecting groove 130 and the center of the lower connecting groove 130 on the cathode surface intersects the side of the pole frame 120. This prevents the alkali solution entering from the bottom from flowing directly out of the corresponding gas-liquid mixing through hole, avoiding the occurrence of uneven diffusion.

[0040] The number of the first alkali solution inlet through-hole groups 121 is not less than the number of the first gas-liquid mixing through-holes 123; and the number of the second alkali solution inlet through-hole groups 122 is not less than the number of the second gas-liquid mixing through-holes 124. In other words, the number of alkali solution inlets in each anode electrolysis chamber and each cathode electrolysis chamber is greater than or equal to the number of alkali solution outlets to ensure alkali solution balance within the electrolysis chamber.

[0041] The first gas-liquid mixing holes 123 and the second gas-liquid mixing holes 124 are alternately arranged on the upper portion of the pole frame 120. By alternating the arrangement, the first gas-liquid mixing holes 123 and the second gas-liquid mixing holes 124 on the upper portion of the pole frame 120 can be arranged more evenly.

[0042] The number of the first alkali liquid inlet through hole groups 121 is the same as the number of the second alkali liquid inlet through hole groups 122 and they are arranged alternately. By alternating the arrangement, the number of the first alkali liquid inlet through hole groups 121 and the second alkali liquid inlet through hole groups 122 in the lower part of the pole frame 120 can be more evenly arranged.

[0043] By alternately arranging the first gas-liquid mixing through hole 123 and the second gas-liquid mixing through hole 124 on the upper part of the pole frame 120 and the number of the first alkali liquid inlet through hole group 121 being the same as the number of the second alkali liquid inlet through hole group 122 and being arranged alternately, the liquid inlet and liquid outlet of the cathode electrolysis chamber and the anode electrolysis chamber are dynamically balanced.

[0044] Specifically, the number of the first alkali liquid inlet through-hole groups 121 and the number of the second alkali liquid inlet through-hole groups 122 are both no less than 5, and the corresponding number of the first gas-liquid mixing through-holes 123 and the second gas-liquid mixing through-holes 124 are both no less than 5. Of course, the number of the first alkali liquid inlet through-hole groups 121 and the number of the second alkali liquid inlet through-hole groups 122 can also be 8, 10, 12, etc. The specific number can be determined according to the different sizes of the bipolar plates 100.

[0045] Please refer to Figures 4-5 in conjunction with Figures 1-3. On the other hand, the present application further provides an end plate, comprising a first end plate 210 and a second end plate 220; the first end plate 210 is provided with an alkali liquid inlet 213 corresponding to the first through hole in the above-mentioned bipolar plate 100, a first gas-liquid mixing outlet 211 corresponding to the first gas-liquid mixing through hole 123 in the bipolar plate 100, and a second gas-liquid mixing outlet 212 corresponding to the second gas-liquid mixing through hole 124 in the bipolar plate 100; wherein the alkali liquid inlet 213 is arranged at the lower portion of the first end plate 210, and the first gas-liquid mixing outlet 211 and the second gas-liquid mixing outlet 212 are arranged at the upper portion of the first end plate; and the bottom of the second end plate 220 is provided with a first groove 221 corresponding to the first alkali liquid inlet through hole group 121 in the bipolar plate 100, and a second groove 222 corresponding to the second alkali liquid inlet through hole group 122 in the bipolar plate 100.

[0046] The first groove 221 connects the second through hole 121b of the first alkali solution inlet through hole group to the first through hole 121a, so that the second through holes 121b of all first alkali solution inlet through hole groups of the alkaline electrolytic cell are connected to the first through hole 121a, thereby forming a first alkali solution inlet channel 500. The second groove 222 connects the second through hole 122b of the second alkali solution inlet through hole group to the first through hole 122a, so that the second through holes 122b of all second alkali solution inlet through hole groups of the alkaline electrolytic cell are connected to the first through hole 122a, thereby forming a second alkali solution inlet channel 600.

[0047] The first gas-liquid mixed outlets 211 and the second gas-liquid mixed outlets 212 are alternately arranged on the upper portion of the first end plate 210 .

[0048] Referring to Figure 6, on the other hand, the present application also provides an alkaline electrolytic cell, comprising a plurality of the above-mentioned bipolar plates 100, the above-mentioned end plates, a diaphragm (not shown in the figure), and oppositely arranged positive plates 300 and negative plates 400, wherein the plurality of bipolar plates 100 are arranged side by side and spaced apart between the positive plates 300 and the negative plates 400, and a diaphragm is arranged between every two bipolar plates 100; the first alkali liquid inlet through-hole groups 121 of the plurality of bipolar plates 100 and the first groove 221 on the second end plate 220 are interconnected to form a first alkali liquid inlet channel 500, and the second alkali liquid inlet through-hole groups 122 of the plurality of bipolar plates 100 and the second groove 222 on the second end plate 220 are interconnected to form a second alkali liquid inlet channel 600; wherein an anode electrolysis chamber is formed between the anode surface 111 of the bipolar plate 100 and the diaphragm, and a cathode electrolysis chamber is formed between the cathode surface 112 of the bipolar plate 100 and the diaphragm.

[0049] The path for the alkali solution to enter the electrolysis chamber is as follows: the alkali solution first enters the first alkali solution inlet channel 500 formed by the first through hole 121a of the first alkali solution inlet through hole group and the first alkali solution inlet channel 500 and the second alkali solution inlet channel 600 formed by the first through hole 122a of the second alkali solution inlet through hole group from one end of the alkaline electrolytic cell. After reaching the other end of the alkaline electrolytic cell, the alkali solution enters each electrolysis chamber through the second through hole 121b of the first alkali solution inlet through hole group and the second through hole 122b of the second alkali solution inlet through hole group. This achieves uniform distribution of the alkali solution and solves the problem of uneven alkali solution distribution caused by the excessive length of the cell body in large alkaline electrolytic cells. This prevents the alkaline electrolytic cell from deteriorating in operation, improves hydrogen production efficiency, and ultimately achieves the goal of saving the power consumption of the alkaline electrolytic cell.

[0050] It should be noted that the first end plate 210 is arranged close to the negative electrode plate 400, that is, the alkaline solution inlet 213 of the alkaline electrolytic cell is arranged at the cathode end of the alkaline electrolytic cell, and the first gas-liquid mixed outlet 211 and the second gas-liquid mixed outlet 212 are also arranged at the cathode end of the alkaline electrolytic cell, which can reduce current loss and thus improve hydrogen production efficiency.

[0051] The above description is only a description of the preferred embodiments of the present application and does not limit the scope of the present application. Any changes and modifications made by ordinary technicians in the field of the present application based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A bipolar plate, characterized in that: include: The bipolar plate body is a square structure and includes an anode surface and a cathode surface that are opposite to each other; A pole frame, fixedly arranged around the bipolar plate; A first alkali liquid inlet through hole group and a second alkali liquid inlet through hole group, both of which are penetrated in the lower part of the pole frame along the thickness direction of the pole frame; wherein each group of alkali liquid inlet through hole groups comprises a first through hole and a second through hole; wherein the second through hole of the first alkali liquid inlet through hole group is connected to the anode surface, and the first through hole of the first alkali liquid inlet through hole group is not connected to the bipolar plate body; the second through hole of the second alkali liquid inlet through hole group is connected to the cathode surface, and the first through hole of the second alkali liquid inlet through hole group is not connected to the bipolar plate body; and, The first gas-liquid mixing through hole and the second gas-liquid mixing through hole are both arranged in the upper part of the pole frame along the thickness direction of the pole frame, wherein the first gas-liquid mixing through hole is connected to the anode surface; and the second gas-liquid mixing through hole is connected to the cathode surface.

2. The bipolar plate according to claim 1, characterized in that: The second through hole of the first alkali liquid inlet through hole group and the anode surface, the second through hole of the second alkali liquid inlet through hole group and the cathode surface, the first gas-liquid mixing through hole and the anode surface, and the second gas-liquid mixing through hole and the cathode surface are all connected through connecting grooves.

3. The bipolar plate according to claim 2, characterized in that: The shape of the connecting groove is any one of a rectangle, a waist shape and a funnel shape.

4. The bipolar plate according to claim 2, characterized in that: A line connecting the center of the upper connecting groove of the cathode surface and the center of the lower connecting groove intersects with the side of the pole frame.

5. The bipolar plate according to claim 1, characterized in that: The number of the first alkali liquid inlet through hole group is not less than the number of the first gas-liquid mixing through holes; the number of the second alkali liquid inlet through hole group is not less than the number of the second gas-liquid mixing through holes.

6. The bipolar plate according to claim 1, characterized in that: The first gas-liquid mixing through holes and the second gas-liquid mixing through holes are alternately arranged at the upper portion of the pole frame.

7. The bipolar plate according to claim 1, characterized in that: The number of the first alkali solution inlet through hole groups is the same as the number of the second alkali solution inlet through hole groups and they are arranged alternately.

8. An end plate, characterized in that: It comprises a first end plate and a second end plate; an alkali liquid inlet corresponding to the first through hole in the bipolar plate according to any one of claims 1 to 7, a first gas-liquid mixing outlet corresponding to the first gas-liquid mixing through hole in the bipolar plate, and a second gas-liquid mixing outlet corresponding to the second gas-liquid mixing through hole in the bipolar plate are provided on the first end plate; wherein the alkali liquid inlet is arranged at the lower part of the first end plate, and the first gas-liquid mixing outlet and the second gas-liquid mixing outlet are arranged at the upper part of the first end plate; a first groove corresponding to the first alkali liquid inlet through hole group in the bipolar plate and a second groove corresponding to the second alkali liquid inlet through hole group in the bipolar plate are provided at the bottom of the second end plate.

9. The end plate according to claim 8, characterized in that The first gas-liquid mixed outlets and the second gas-liquid mixed outlets are alternately arranged on the upper portion of the first end plate.

10. An alkaline electrolytic cell, characterized in that: It comprises a plurality of bipolar plates according to any one of claims 1 to 7, an end plate according to claim 8 or 9, a diaphragm and relatively arranged positive plates and negative plates, wherein the plurality of bipolar plates are arranged side by side and spaced apart between the positive plate and the negative plate, and a diaphragm is arranged between every two bipolar plates; the first alkali liquid inlet through hole group of the plurality of bipolar plates and the first groove on the second end plate are interconnected to form a first alkali liquid inlet channel, and the second alkali liquid inlet through hole group of the plurality of bipolar plates and the second groove on the second end plate are interconnected to form a second alkali liquid inlet channel; wherein an anode electrolysis chamber is formed between the anode surface of the bipolar plate and the diaphragm, and a cathode electrolysis chamber is formed between the cathode surface of the bipolar plate and the diaphragm.

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