WO2024078362A1

WO2024078362A1 - Bipolar plate and electrolytic cell

Info

Publication number: WO2024078362A1
Application number: PCT/CN2023/122661
Authority: WO
Inventors: 姜超; 衣美卿; 龙广征; 焦庆生; 王晖
Original assignee: 无锡隆基氢能科技有限公司
Priority date: 2022-10-12
Filing date: 2023-09-28
Publication date: 2024-04-18
Also published as: CN218951513U

Abstract

The present application relates to a bipolar plate and an electrolytic cell. The bipolar plate has a first side face and a second side face, which are oppositely arranged, and the bipolar plate comprises a bipolar plate body and a first polar frame fixedly arranged on the periphery of the bipolar plate body, wherein a first cavity is formed inside the bipolar plate body; and on the first side face, the first polar frame is respectively provided with first alkaline electrolyte intake through-holes and first alkaline electrolyte return through-holes, which are in communication with the first cavity, the first alkaline electrolyte return through-holes being configured to lead out an alkaline electrolyte from the first cavity and change the flow direction of the alkaline electrolyte. In the bipolar plate provided by the present application, the flow direction of the alkaline electrolyte can be changed when the alkaline electrolyte passes through the interior of the bipolar plate. In this way, when the bipolar plate is applied to the electrolytic cell, alkaline electrolyte paths leading to electrolysis chambers can be respectively adjusted and controlled, thereby effectively solving the problem of there being insufficient electrolyte in some of the electrolysis chambers.

Description

Bipolar plates and electrolyzers

This application claims priority to a Chinese patent application filed with the Chinese Patent Office on October 12, 2022, with application number 202222690592.7 and invention name “Bipolar Plate and Electrolyzer”, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of water electrolysis, and in particular to a bipolar plate and an electrolytic cell.

Background technique

In the field of alkaline water electrolysis, as single electrolytic cells are getting bigger and bigger, some large electrolytic cells are even more than five meters long, which can include hundreds of electrode chambers. However, as the size of the electrolytic cell increases, new problems are also brought about. For example, the alkali solution is very uneven when it is distributed to each electrolytic chamber from one side to the other, and local liquid shortage often occurs in the electrolytic chamber. On the one hand, this will affect the uniformity of the temperature of the entire electrolytic cell body, causing the local temperature of the electrolytic cell to be too high. In severe cases, it may even cause the electrolytic cell to burn out. On the other hand, this will easily increase the power consumption of the electrolytic cell.

Application Contents

The purpose of the present application is to provide a bipolar plate and an electrolytic cell, wherein the design of the bipolar plate can change the flow direction of the alkaline solution when passing through the inside of the bipolar plate, so that when the bipolar plate is used in the electrolytic cell, the alkaline solution path entering each electrolytic chamber can be regulated separately, thereby effectively avoiding the problem of liquid shortage in some electrolytic chambers.

In order to implement the above-mentioned purpose, the present application provides a bipolar plate, which has a first side surface and a second side surface arranged opposite to each other, and the bipolar plate includes a bipolar plate body and a first pole frame fixedly arranged on the outer periphery of the bipolar plate body, and a first chamber is formed inside the bipolar plate body; on the first side surface, a first alkali inlet through hole and a first alkali liquid return through hole which are connected to the first chamber are respectively arranged on the first pole frame, and the first alkali liquid return through hole is used to draw out the alkali liquid in the first chamber and change the flow direction of the alkali liquid.

Optionally, the first alkali inlet through hole and the first alkali solution return through hole are both located at the lower part of the first pole frame.

Optionally, on the first side surface, the first pole frame is provided with a first through groove in a radial direction, and the first alkaline solution return through hole is used to communicate with the electrolysis chamber where the first side surface is located through the first through groove.

Optionally, the first chamber extends from a lower portion of the first side of the bipolar plate to the first The top of the side surface, and the volume of the first chamber is smaller than the volume of the bipolar plate body and larger than 1/2 of the volume of the bipolar plate body;

Or, the first chamber extends from the lower portion of the first side of the bipolar plate to the top of the first side, and the volume of the first chamber is less than or equal to 1/2 of the volume of the bipolar plate body;

Or, the first chamber extends from the lower portion of the first side surface of the bipolar plate to the middle area of the first side surface, and the volume of the first chamber is less than or equal to 1/4 of the volume of the bipolar plate body;

Alternatively, the first chamber is located at a lower portion of a first side surface of the bipolar plate, and a volume of the first chamber is less than or equal to 1/8 of a volume of the bipolar plate body.

Optionally, on the second side, the lower part of the first pole frame is provided with an alkali solution distribution blind hole along the axial direction and a second through groove along the radial direction, and the alkali solution distribution blind hole is used to communicate with the electrolysis chamber where the second side is located through the second through groove.

On the basis of the above technical scheme, the present application also provides an electrolytic cell, comprising an end pressure plate and relatively arranged positive and negative plates, wherein the end pressure plate is arranged on the outer side of the negative plate, and the electrolytic cell also comprises the above-mentioned multiple bipolar plates, wherein the multiple bipolar plates are arranged side by side and spaced apart between the positive plate and the negative plate, and the first side surfaces of the multiple bipolar plates are all arranged toward the negative plate; the first alkali inlet through holes in any two of the bipolar plates are arranged axially on different straight lines to form multiple sections of alkali solution inflow channels of different lengths in the electrolytic cell; the first return alkali solution through holes in any two of the bipolar plates are arranged axially on the same straight line or on straight lines parallel to each other; and the end pressure plate is provided with multiple alkali solution inlets corresponding to the first alkali inlet through holes in the multiple bipolar plates.

Optionally, a plurality of bipolar plates are equidistantly arranged in the electrolytic cell along the axial direction to form alkali solution distribution channels of equal length.

Optionally, the electrolytic cell has a positive electrode plate and a negative electrode plate, and the bipolar plate is arranged between the positive electrode plate and the negative electrode plate.

Optionally, the positive electrode plate includes a positive electrode plate body and a second pole frame fixedly arranged on the periphery of the positive electrode plate body, a second chamber is formed in the positive electrode plate body, and a second alkali inlet through hole and a second alkali liquid return through hole connected to the second chamber are respectively arranged on the side of the second pole frame opposite to the negative electrode plate, and the second alkali liquid return through hole is used to draw out the alkali liquid in the second chamber and change the flow direction of the alkali liquid.

Optionally, the second chamber extends from the lower part of the side opposite to the negative electrode plate to the top of the side opposite to the negative electrode plate, and the volume of the second chamber is smaller than that of the positive electrode plate body. The volume is greater than 1/2 of the volume of the positive plate body;

Or, the second chamber extends from the lower part of the side opposite to the negative electrode plate to the top of the side opposite to the negative electrode plate, and the volume of the second chamber is less than or equal to 1/2 of the volume of the positive electrode plate body;

Or, the second chamber extends from the lower part of the side opposite to the negative electrode plate to the middle area of the side opposite to the negative electrode plate, and the volume of the second chamber is less than or equal to 1/4 of the volume of the positive electrode plate body;

Alternatively, the second chamber is located at a lower portion of a side surface opposite to the negative electrode plate, and a volume of the second chamber is less than or equal to 1/8 of a volume of the positive electrode plate body.

Optionally, the electrolytic cell includes a positive electrode plate and two negative electrode plates, the positive electrode plate is configured as an intermediate electrode plate, the intermediate electrode plate is arranged between the two negative electrode plates and has a first positive electrode surface and a second positive electrode surface arranged opposite to each other, wherein the first positive electrode surface is opposite to one of the negative electrode plates, and the second positive electrode surface is opposite to the other negative electrode plate.

Optionally, the intermediate electrode plate includes an intermediate electrode plate body and an intermediate electrode frame fixed on the periphery of the intermediate electrode plate body, a third chamber and a fourth chamber are formed side by side inside the intermediate electrode plate body, and on the first positive electrode surface, the intermediate electrode frame is respectively provided with a third alkali inlet through hole and a third alkali liquid return through hole connected to the third chamber; on the second positive electrode surface, the intermediate electrode frame is respectively provided with a fourth alkali inlet through hole and a fourth alkali liquid return through hole connected to the fourth chamber, wherein the third alkali liquid return through hole is used to draw out the alkali liquid in the third chamber and change the flow direction of the alkali liquid; the fourth alkali liquid return through hole is used to draw out the alkali liquid in the fourth chamber and change the flow direction of the alkali liquid.

Optionally, the third chamber extends from the lower part of the first electrode surface to the top of the first electrode surface, and the volume of the third chamber is less than 1/2 of the volume of the intermediate electrode body and greater than 1/4 of the volume of the intermediate electrode body;

Or, the third chamber extends from the lower part of the first electrode surface to the top of the first electrode surface, and the volume of the third chamber is less than or equal to 1/4 of the volume of the intermediate plate body;

Or, the third chamber extends from the lower part of the first electrode surface to the middle area of the first electrode surface, and the volume of the third chamber is less than or equal to 1/8 of the volume of the intermediate electrode body;

Alternatively, the third chamber is located at the lower part of the first electrode surface, and the volume of the third chamber is less than or equal to 1/16 of the volume of the intermediate electrode body.

Optionally, the fourth chamber extends from the lower part of the second electrode surface to the top of the second electrode surface, and the volume of the fourth chamber is less than 1/2 of the volume of the intermediate plate body and greater than 1/4 of the volume of the intermediate plate body;

Or, the fourth chamber extends from the lower part of the second electrode surface to the top of the second electrode surface, and the volume of the fourth chamber is less than or equal to 1/4 of the volume of the intermediate electrode body;

Or, the fourth chamber extends from the lower part of the second electrode surface to the middle area of the second electrode surface, and the volume of the fourth chamber is less than or equal to 1/8 of the volume of the intermediate electrode body;

Alternatively, the fourth chamber is located at the lower part of the second electrode surface, and the volume of the third chamber is less than or equal to 1/16 of the volume of the intermediate electrode body.

Optionally, the plurality of alkali solution inlets are connected to the plurality of alkali solution circulation pumps in a one-to-one correspondence to form a plurality of alkali solution input channels, and each of the alkali solution input channels is provided with a control valve.

Optionally, a flow meter is also provided on each of the alkali solution input channels.

Through the above technical scheme, in the bipolar plate provided in the present application, a first chamber is formed in the bipolar plate body of the bipolar plate, and a first alkali inlet through hole and a first return alkali solution through hole connected to the first chamber are provided on the first side of the first pole frame, so that the alkali solution can change its flow direction after flowing through the bipolar plate, and then pass into the corresponding electrolysis chamber. In this way, when designing the electrolytic cell, the number of alkali solution input channels and alkali solution distribution channels can be increased by adding the bipolar plate, and due to the increase in the number of alkali solution input channels and alkali solution distribution channels, the alkali solution transport paths in each electrolysis chamber will not interfere with each other, and can be individually controlled by independent alkali solution input channels and alkali solution distribution channels. In this way, even if the size of the electrolytic cell is increased, the alkali solution will be evenly distributed to each electrolysis chamber. In this way, the temperature of the electrolytic cell is uniform everywhere, which not only extends the service life but also greatly reduces the energy consumption.

Other features and advantages of the present application will be described in detail in the subsequent specific implementation section.

The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of an electrolytic cell provided according to a first embodiment of the present application, wherein the end pressure plate is omitted;

FIG. 2 is a first structure of a bipolar plate in an electrolytic cell provided according to a first embodiment of the present application. Schematic diagram;

3 is a second structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application;

4 is a third structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application, wherein part of the structure is omitted to show the first chamber;

5 is a schematic structural diagram of a positive electrode plate in an electrolytic cell provided according to a first embodiment of the present application;

6 is another schematic diagram of the structure of the positive electrode plate in the electrolytic cell provided according to the first embodiment of the present application, wherein part of the structure is omitted to show the second chamber;

FIG7 is a schematic diagram of the structure of an electrolytic cell provided according to a second embodiment of the present application, wherein, in order to simplify the structure, only one bipolar plate is schematically shown between each negative electrode plate and the intermediate electrode plate, and the end pressure plate is also omitted;

8 is a schematic structural diagram of an intermediate electrode plate in an electrolytic cell provided according to a second embodiment of the present application;

9 is another schematic structural diagram of an intermediate electrode plate in an electrolytic cell provided according to a second embodiment of the present application;

FIG10 is another schematic diagram of the structure of the intermediate plate in the electrolytic cell according to the second embodiment of the present application, wherein part of the structure is omitted to show the third chamber and the fourth chamber;

11 is a fourth structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application;

12 is a fifth structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application;

13 is a sixth structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application;

14 is a seventh structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application;

FIG. 15 is an eighth structural schematic diagram of a bipolar plate in an electrolytic cell provided according to the first embodiment of the present application.

Description of Reference Numerals
1-bipolar plate; 11-first side; 12-second side; 13-bipolar plate body; 131-first chamber;
14-first pole frame; 141-first alkali inlet through hole; 142-first alkali return through hole; 143-first through groove; 144-second through groove; 145-alkaline solution distribution blind hole; 2-negative plate; 3-positive plate; 31-positive plate body; 311-second chamber; 32-second pole frame; 321-second alkali inlet through hole; 322-second alkali solution return through hole; 33-intermediate plate; 331-first positive electrode surface; 332-second positive electrode surface; 333-intermediate plate body; 3331-third chamber; 3332-fourth chamber; 334-intermediate pole frame; 3341-third alkali inlet through hole; 3342-third alkali solution return through hole; 3343-fourth alkali inlet through hole; 3344-fourth alkali solution return through hole; 4-electrolysis chamber.

Specific embodiments

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the present application, unless otherwise stated, directional words such as "upper and lower" refer to upper and lower in the direction of gravity during actual use. "Inside and outside" refer to "inside and outside" relative to the corresponding component's own contour, unless otherwise explained, for example, the explanation of "outside" below. In addition, the terms "first", "second", "third", "fourth", etc. used in this application are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate this application and should not be construed as limitations on this application.

The present application provides a bipolar plate 1, as shown in Figures 2 to 4, the bipolar plate 1 has a first side surface 11 and a second side surface 12 arranged opposite to each other, the bipolar plate 1 includes a bipolar plate body 13 and a first pole frame 14 fixedly arranged on the outer periphery of the bipolar plate body 13, and a first chamber 131 is formed inside the bipolar plate body 13; a first alkali inlet through hole 141 and a first return alkali liquid through hole 142 connected to the first chamber 131 are respectively provided on the first side surface 11 and the first pole frame 14, and the first return alkali liquid through hole 142 is used to draw out the alkali liquid in the first chamber 131 and change the flow direction of the alkali liquid.

Through the above technical scheme, in the bipolar plate 1 provided in the present application, a first chamber 131 is formed in the bipolar plate body 13 of the bipolar plate 1, and a first alkali inlet through hole 141 and a first return alkali solution through hole 142 which are connected to the first chamber 131 are provided on the first side surface 11 of the first pole frame 14, so that the alkali solution can change its flow direction after flowing through the bipolar plate 1, and then pass into the corresponding electrolysis chamber 4. In this way, when designing the electrolytic cell, the number of alkali solution input channels and alkali solution distribution channels can be increased by adding the bipolar plate 1, and due to the increase in the number of alkali solution input channels and alkali solution distribution channels, the alkali solution transport paths in each electrolysis chamber 4 will not interfere with each other, and can The alkali solution input channel and the alkali solution distribution channel are independently controlled. In this way, even if the size of the electrolytic cell increases, the alkali solution will be evenly distributed to each electrolytic chamber 4. In this way, the temperature of the electrolytic cell is uniform throughout, which not only extends the life of the cell but also greatly reduces the energy consumption.

In the specific embodiment provided in the present application, the first alkali inlet through hole 141 and the first alkali return through hole 142 can be arranged in any suitable manner on the first pole frame 14. Optionally, as shown in FIG. 2 , in order to facilitate the distribution of alkali solution from the lower part to the electrolysis chamber 4, the first alkali inlet through hole 141 and the first alkali return through hole 142 are both located at the lower part of the first pole frame 14.

In the specific embodiment provided in the present application, referring to FIG. 2 , in order to facilitate the smooth transportation of the alkali solution to the electrolysis chamber 4 where the first side surface 11 is located after the flow direction of the alkali solution changes after passing through the first chamber 131, a first pole frame 14 may be provided on the first side surface 11 with a first through groove 143 radially opened therein, and the first return alkali solution through hole 142 is used to communicate with the electrolysis chamber 4 where the first side surface 11 is located through the first through groove 143.

As shown in FIG. 11 , optionally, the first chamber 131 extends from the lower part of the first side 11 of the bipolar plate 1 to the top of the first side 11 , the first chamber 131 is connected to the first alkali inlet through hole 141 and the first alkali return through hole 142 , and the volume of the first chamber 131 is smaller than the volume of the bipolar plate body 13 and greater than 1/2 of the volume of the bipolar plate body 13 . The volume of the bipolar plate body 13 refers to the volume of the space occupied by the bipolar plate body 13 . Relative to the volume of the bipolar plate body 13 , the volume of the first chamber 131 is smaller, and the first chamber 131 is suitable for different alkali flow rates, such as the first chamber 131 is suitable for a smaller alkali flow rate. Moreover, the size of the first chamber 131 is flexible and diverse. There is no specific limitation on the shape of the first chamber 131 . For example, as shown in FIG. 11 , the bipolar plate body 13 is cylindrical, and the shape of the first chamber 131 can be 3/4 cylindrical, then the volume of the first chamber 131 is 3/4 of the volume of the bipolar plate body 13 .

Or, as shown in FIG. 12 , optionally, the first chamber 131 extends from the lower portion of the first side 11 of the bipolar plate 1 to the top of the first side 11 , the first chamber 131 is connected to the first alkali inlet through hole 141 and the first alkali return through hole 142 , and the volume of the first chamber 131 is less than or equal to 1/2 of the volume of the bipolar plate body 13 . The volume of the bipolar plate body 13 refers to the volume of the space occupied by the bipolar plate body 13 . Relative to the volume of the bipolar plate body 13 , the volume of the first chamber 131 is smaller, and the first chamber 131 is suitable for different alkali flow rates, such as the first chamber 131 is suitable for smaller alkali flow rates. Moreover, the size of the first chamber 131 is flexible and diverse. The shape of the first chamber 131 is not specifically limited. For example, as shown in FIG. 12 , the bipolar plate body 13 is cylindrical, and the shape of the first chamber 131 can be semi-cylindrical, then the volume of the first chamber 131 is 1/2 of the volume of the bipolar plate body 13. Alternatively, the shape of the first chamber 131 can be less than half of a cylinder, etc., then the volume of the first chamber 131 is less than the volume of the bipolar plate body 13. 1/2 of the volume of body 13.

Or, as shown in FIG. 13 , optionally, the first chamber 131 extends from the lower portion of the first side 11 of the bipolar plate 1 to the middle region of the first side 11, where the middle region refers to the geometric center of the first side 11 and its vicinity. The first chamber 131 is connected to the first alkali inlet through hole 141 and the first alkali return through hole 142, and the volume of the first chamber 131 is less than or equal to 1/4 of the volume of the bipolar plate body 13. The volume of the first chamber 131 is smaller than that of the bipolar plate body 13, and the first chamber 131 is suitable for different alkali flow rates, such as the first chamber 131 is suitable for a smaller alkali flow rate. Moreover, the size of the first chamber 131 is flexible and diverse. There is no specific limitation on the shape of the first chamber 131. For example, as shown in FIG. 13 , the bipolar plate body 13 is cylindrical, and the shape of the first chamber 131 can be 1/4 cylindrical, then the volume of the first chamber 131 is 1/4 of the volume of the bipolar plate body 13; or, the first chamber 131 can be less than 1/4 cylindrical, etc., then the volume of the first chamber 131 is less than 1/4 of the volume of the bipolar plate body 13.

Or, as shown in FIG. 14, optionally, the first chamber 131 is located at the lower part of the first side 11 of the bipolar plate 1, the first chamber 131 is connected to the first alkali inlet through hole 141 and the first alkali return through hole 142, and the volume of the first chamber 131 is less than or equal to 1/8 of the volume of the bipolar plate body 13. Relative to the volume of the bipolar plate body 13, the volume of the first chamber 131 is smaller, and the first chamber 131 is suitable for different alkali flow rates, such as the first chamber 131 is suitable for a smaller alkali flow rate. Moreover, the size of the first chamber 131 is flexible and diverse. There is no specific limitation on the shape of the first chamber 131. For example, as shown in FIG. 14, the bipolar plate body 13 is cylindrical, and the shape of the first chamber 131 can be a cylinder less than 1/4 of a cylinder. The orthographic projection of the cylinder on the first side 11 is formed by connecting two inferior arcs whose lengths are both less than 1/4 of a circular arc. In this case, the volume of the first chamber 131 is 1/8 of the volume of the bipolar plate body 13 or even smaller.

In summary, relative to the volume of the bipolar plate body 13 , the volume of the first chamber 131 is smaller, and the first chamber 131 is suitable for different alkali solution flow rates, for example, the first chamber 131 is suitable for a smaller alkali solution flow rate, and the size of the first chamber 131 is flexible and diverse.

Alternatively, as shown in FIG. 15 , optionally, the first chamber 131 is not disposed inside the bipolar plate body 13, but is located at the lower part of the first pole frame 14, and is directly formed by the first alkali inlet through hole 141 and the first alkali return through hole 142. The volume of the first chamber 131 is smaller and suitable for a smaller alkali solution flow rate. The shape of the first chamber 131 can be a waist-shaped chamber, etc., and the shape of the first chamber 131 is not specifically limited.

In the specific embodiment provided in the present application, as shown in FIG. 3 , in order to facilitate the alkali solution in the chamber of the bipolar plate 1 or the positive plate 3 adjacent to the second side 12 to change its flow direction when passing through the chamber, After the change, it can be smoothly transported to the electrolysis chamber 4 where the second side 12 is located. A blind hole 145 for distributing alkali solution along the axial direction and a second through groove 144 along the radial direction can be respectively provided at the lower part of the first pole frame 14 on the second side 12. The blind hole 145 for distributing alkali solution is connected to the electrolysis chamber 4 where the second side 12 is located through the second through groove 144.

It should be noted that in the above technical solution, since the alkali solution input channel and alkali solution distribution channel of each bipolar plate 1 are independently controlled and will not interfere with each other, the first return alkali solution through hole 142 of the first side 11 of each bipolar plate 1 and the alkali solution distribution blind hole 145 of the second side 12 are not connected to each other, and the alkali solution in the electrolysis chamber 4 on the side where the first side 11 is located comes from the first chamber 131 of the bipolar plate 1 itself, while the alkali solution in the electrolysis chamber 4 on the side where the second side 12 is located comes from the first chamber 131 of the bipolar plate 1 adjacent to the second side 12 of the bipolar plate 1 or the second chamber 311 of the positive plate 3 adjacent to the second side 12 of the bipolar plate 1. Among them, the relevant contents about the positive plate 3 will be described in detail in the following content. On the basis of the above technical scheme, the present application also provides an electrolytic cell, as shown in Figures 1 and 7, the electrolytic cell includes an end pressure plate and relatively arranged positive plates 3 and negative plates 2, the end pressure plate is arranged on the outside of the negative plate 2, and the electrolytic cell also includes the above-mentioned multiple bipolar plates 1, the multiple bipolar plates 1 are arranged side by side and spaced between the positive plate 3 and the negative plate 2, and the first side surfaces 11 of the multiple bipolar plates 1 are all arranged toward the negative plate 2; the first alkali inlet through holes 141 in any two bipolar plates 1 are arranged axially on different straight lines to form multiple sections of alkali solution inflow channels with different lengths in the electrolytic cell; the first return alkali solution through holes 142 in any two bipolar plates 1 are arranged axially on the same straight line or on straight lines parallel to each other; and multiple alkali solution inlets corresponding to the first alkali inlet through holes 141 in the multiple bipolar plates 1 are opened on the end pressure plate.

Through the above technical solution, in the electrolytic cell provided in the present application, a plurality of bipolar plates 1 arranged side by side and spaced apart are added between the positive plate 3 and the negative plate 2, and the first side surfaces 11 of the plurality of bipolar plates 1 are all arranged toward the negative plate 2, so that the first alkali inlet through holes 141 in any two bipolar plates 1 are arranged on different straight lines along the axial direction, and a plurality of alkali solution inlets corresponding to the first alkali inlet through holes 141 in the plurality of bipolar plates 1 are opened on the end pressing plate, so as to form a plurality of independent alkali solution channels that can be passed from the end pressing plate to the corresponding electrolytic chamber 4, so that when the bipolar plate 1 is connected to the positive plate 3 and the negative plate 2 When applied to the electrolytic cell, the alkali solution channels leading to the various electrolytic chambers 4 can be made independent of each other, so that the alkali solutions leading to the various electrolytic chambers 4 will not affect each other, and the alkali solutions can be distributed to the respective electrolytic chambers 4 through their respective alkali solution channels, thereby effectively improving the problem of lack of liquid in some electrolytic chambers 4 in the electrolytic cell, and making the alkali solution evenly distributed to the various electrolytic chambers 4. In this way, the temperature of the entire cell body of the electrolytic cell will become uniform during the electrolysis process, which not only alleviates the excessively high local temperature of the electrolytic cell, but also avoids the burning of the electrolytic cell. Moreover, the power consumption of the electrolytic cell is greatly reduced. In addition, by arranging the first return alkali solution through holes 142 of any two bipolar plates 1 on the same straight line along the axis, it is not only convenient for production and processing, but also allows the alkali solutions in each alkali solution distribution channel to have the same potential energy, which is more conducive to the uniform distribution of the alkali solution in each electrolytic chamber 4.

It should be noted that, in addition to the bipolar plate 1 described in the above content of the present application, the electrolytic cell in the above technical solution may also include an ordinary bipolar plate 1 in which the first chamber 131 is not arranged in the bipolar plate body 13. In this case, the bipolar plate 1 in the present application can be arranged at the corresponding position as needed.

It should also be noted that the “outside” mentioned in the above process is the outside relative to the space formed between the positive plate 3 and the negative plate 2, that is, the outside of the positive plate 3 refers to the side of the positive plate 3 facing away from the negative plate 2, and the outside of the negative plate 2 refers to the side of the negative plate 2 facing away from the positive plate 3.

In the specific embodiment provided in the present application, as shown in Figures 1 and 7, a plurality of bipolar plates 1 are equidistantly arranged in the electrolytic cell along the axial direction to form alkali solution distribution channels of equal length. This arrangement is to enable the alkali solution in each alkali solution input channel to enter each electrolytic chamber 4 through an alkali solution distribution channel of the same length after passing through the first chamber 131 of each bipolar plate 1, so as to be more conducive to the uniform distribution of the alkali solution.

In the specific embodiments provided in the present application, the electrolytic cell may have at least the following two possible embodiments:

In a first possible embodiment, as shown in FIG. 1 , the electrolytic cell has a positive plate 3 and a negative plate 2, and the bipolar plate 1 is arranged between the positive plate 3 and the negative plate 2. Through such an arrangement, all alkali liquid enters the bipolar plate 1 or the positive plate 3 through the alkali liquid inlet on the end pressure plate arranged on one side of the negative plate 2, and passes through their respective chambers to make a path return. It should be noted that in this embodiment, an end pressure plate is also arranged on the outside of the positive plate 3. Unlike the end pressure plate arranged on one side of the negative plate 2, the end pressure plate arranged on the outside of the positive plate 3 can adopt a conventional end pressure plate in the prior art.

In the first possible embodiment described above, referring to FIGS. 5 and 6 , the positive plate 3 includes a positive plate body 31 and a second pole frame 32 fixedly arranged on the outer periphery of the positive plate body 31, a second chamber 311 is formed in the positive plate body 31, and a second alkali inlet through hole 321 and a second alkali return through hole 322 communicating with the second chamber 311 are respectively arranged on the side of the second pole frame 32 opposite to the negative plate 2, the second alkali return through hole 322 is used to lead out the alkali in the second chamber 311 and change the flow direction of the alkali, and this arrangement is to make the alkali input on one side of the end pressure plate pass through the second in the positive plate 3. After the chamber 311, the flow direction is changed.

In a second possible embodiment, as shown in FIG. 7 , the electrolytic cell includes a positive plate 3 and two negative plates 2, the positive plate 3 is configured as an intermediate plate 33, the intermediate plate 33 is disposed between the two negative plates 2 and has a first positive surface 331 and a second positive surface 332 disposed opposite to each other, wherein the first positive surface 331 is opposite to one negative plate 2, and the second positive surface 332 is opposite to the other negative plate 2, and through such an arrangement, the intermediate plate 33 can simultaneously form an electrolytic cell with the two negative plates 2. Compared with the first embodiment, in which all alkali solutions enter from the end pressure plate on the same side, in this embodiment, the alkali solutions are respectively introduced into the corresponding electrolytic chambers 4 through the alkali solution inlets on the two end pressure plates outside the two negative plates 2, so when the electrolytic cell is large in size and the number of electrolytic chambers 4 is large, the second embodiment can be selected to speed up the entry of the alkali solution into each electrolytic chamber 4.

Optionally, the second chamber 311 extends from the lower part of the side opposite to the negative plate 2 to the top of the side opposite to the negative plate 2, the second chamber 311 is connected to the second alkali inlet through hole 321 and the second alkali return through hole 322, and the volume of the second chamber 311 is smaller than the volume of the positive plate body 31 and greater than 1/2 of the volume of the positive plate body 31. The volume of the positive plate body 31 refers to the volume of the space occupied by the positive plate body 31. Relative to the volume of the positive plate body 31, the volume of the second chamber 311 is smaller, and the second chamber 311 is suitable for different alkali flow rates, such as the second chamber 311 is suitable for a smaller alkali flow rate. Moreover, the size of the second chamber 311 is flexible and diverse. There is no specific limitation on the shape of the second chamber 311. For example, the positive plate body 31 is cylindrical, and the shape of the second chamber 311 can be 3/4 cylindrical, then the volume of the second chamber 311 is 3/4 of the volume of the positive plate body 31.

Or, optionally, the second chamber 311 extends from the lower part of the side opposite to the negative plate 2 to the top of the side opposite to the negative plate 2, the second chamber 311 is connected to the second alkali inlet through hole 321 and the second alkali return through hole 322, and the volume of the second chamber 311 is less than or equal to 1/2 of the volume of the positive plate body 31. The volume of the positive plate body 31 refers to the volume of the space occupied by the positive plate body 31. Relative to the volume of the positive plate body 31, the volume of the second chamber 311 is smaller, and the second chamber 311 is suitable for different alkali flow rates, such as the second chamber 311 is suitable for smaller alkali flow rates. Moreover, the size of the second chamber 311 is flexible and diverse. There is no specific limitation on the shape of the second chamber 311. For example, the positive plate body 31 is cylindrical, and the shape of the second chamber 311 can be semi-cylindrical, then the volume of the second chamber 311 is 1/2 of the volume of the positive plate body 31. Alternatively, the shape of the second chamber 311 can be less than half a cylinder, etc., then the volume of the second chamber 311 is less than 1/2 of the volume of the positive plate body 31.

Alternatively, the second chamber 311 extends from the lower portion of the side opposite to the negative electrode plate 2 to the side opposite to the negative electrode plate 2. The middle area of the side opposite to the negative plate 2, the middle area here refers to the geometric center and its vicinity of the side opposite to the negative plate 2. The second chamber 311 is connected to the second alkali inlet through hole 321 and the second alkali return through hole 322, and the volume of the second chamber 311 is less than or equal to 1/4 of the volume of the positive plate body 31. Relative to the volume of the positive plate body 31, the volume of the second chamber 311 is smaller, and the second chamber 311 is suitable for different alkali flow rates, such as the second chamber 311 is suitable for a smaller alkali flow rate. Moreover, the size of the second chamber 311 is flexible and diverse. There is no specific limitation on the shape of the second chamber 311. For example, the positive plate body 31 is cylindrical, the shape of the second chamber 311 can be 1/4 cylindrical, then the volume of the second chamber 311 is 1/4 of the volume of the positive plate body 31, or the second chamber 311 can be less than 1/4 cylindrical, etc., then the volume of the second chamber 311 is less than 1/4 of the volume of the positive plate body 31.

Or, optionally, the second chamber 311 is located at the lower part of the side opposite to the negative plate 2, the second chamber 311 and the second alkali inlet through hole 321 and the second alkali return through hole 322 are both connected, and the volume of the second chamber 311 is less than or equal to 1/8 of the volume of the positive plate body 31, relative to the volume of the positive plate body 31, the volume of the second chamber 311 is smaller, and the second chamber 311 is suitable for different alkali flow rates, such as, the second chamber 311 is suitable for smaller alkali flow rates. Moreover, the size of the second chamber 311 is flexible and diverse. There is no specific limitation on the shape of the second chamber 311, for example, the positive plate body 31 is cylindrical, the shape of the second chamber 311 can be a cylinder less than 1/4 of a cylinder, and the positive projection of the cylinder on the side opposite to the negative plate 2 is formed by connecting two inferior arcs with lengths less than 1/4 of a circular arc. In this case, the volume of the second chamber 311 is 1/8 of the volume of the positive plate body 31 or even smaller.

In summary, compared with the volume of the positive plate body 31 , the volume of the second chamber 311 is smaller, and the second chamber 311 is suitable for different alkali solution flow rates, for example, the second chamber 311 is suitable for a smaller alkali solution flow rate, and the size of the second chamber 311 is flexible and diverse.

Alternatively, the second chamber 311 is not disposed inside the positive plate body 31, but is located at the lower part of the second pole frame 32, and is directly formed by the second alkali inlet through hole 321 and the second alkali return through hole 322. The volume of the second chamber 311 is smaller and suitable for a smaller alkali solution flow rate. The shape of the second chamber 311 can be a waist-shaped chamber, etc., and the shape of the second chamber 311 is not specifically limited.

In the above-mentioned second possible embodiment, referring to FIGS. 8 to 10 , the intermediate plate 33 includes an intermediate plate body 333 and an intermediate plate frame 334 fixed to the periphery of the intermediate plate body 333 , and a third chamber 3331 and a fourth chamber 3332 are formed side by side inside the intermediate plate body 333 , and a third alkali inlet through hole 3341 and a third alkali return through hole 3342 communicating with the third chamber 3331 are respectively provided on the first positive electrode surface 331 and the intermediate plate frame 334 ; and a fourth alkali inlet through hole 3343 and a fourth alkali return through hole 3344 communicating with the fourth chamber 3332 are respectively provided on the second positive electrode surface 332, wherein, The third return alkali liquid through hole 3342 is used to lead out the alkali liquid in the third chamber 3331 and change the flow direction of the alkali liquid; the fourth return alkali liquid through hole 3344 is used to lead out the alkali liquid in the fourth chamber 3332 and change the flow direction of the alkali liquid. Through such an arrangement, the two chambers of the intermediate electrode plate 33 can be isolated from each other and do not interfere with each other, thereby forming respective electrolysis environments on both sides of the intermediate electrode plate 33.

A third chamber 3331 and a fourth chamber 3332 are formed side by side inside the intermediate plate body 333 . The third chamber 3331 and the fourth chamber 3332 are symmetrically distributed inside the intermediate plate body 333 .

Optionally, the third chamber 3331 extends from the lower part of the first positive electrode surface 331 to the top of the first positive electrode surface 331, the third chamber 3331 is connected to the third alkali inlet through hole 3341 and the third alkali return through hole 3342, and the volume of the third chamber 3331 is less than 1/2 of the volume of the intermediate plate body 333, and greater than 1/4 of the volume of the intermediate plate body 333. The volume of the intermediate plate body 333 refers to the volume of the space occupied by the intermediate plate body 333. Relative to half the volume of the intermediate plate body 333, the volume of the third chamber 3331 is smaller, and the third chamber 3331 is suitable for different alkali flow rates, such as the third chamber 3331 is suitable for a smaller alkali flow rate, and the size of the third chamber 3331 is flexible and diverse. The shape of the third chamber 3331 is not specifically limited.

Or, optionally, the third chamber 3331 extends from the lower part of the first positive electrode surface 331 to the top of the first positive electrode surface 331, the third chamber 3331 and the third alkali inlet through hole 3341 and the third alkali return through hole 3342 are all connected, and the volume of the third chamber 3331 is less than or equal to 1/4 of the volume of the intermediate plate body 333. The volume of the intermediate plate body 333 refers to the volume of the space occupied by the intermediate plate body 333. Relative to half the volume of the intermediate plate body 333, the volume of the third chamber 3331 is smaller, and the third chamber 3331 is suitable for different alkali flow rates, such as the third chamber 3331 is suitable for a smaller alkali flow rate, and the size of the third chamber 3331 is flexible and diverse. The shape of the third chamber 3331 is not specifically limited.

Or, optionally, the third chamber 3331 extends from the lower part of the first positive electrode surface 331 to the middle area of the first positive electrode surface 331, where the middle area refers to the geometric center of the first positive electrode surface 331 and its vicinity. The third chamber 3331 is connected to the third alkali inlet through hole 3341 and the third alkali return through hole 3342, and the volume of the third chamber 3331 is less than or equal to 1/8 of the volume of the intermediate plate body 333. The volume of the third chamber 3331 is smaller than half the volume of the intermediate plate body 333. The third chamber 3331 is suitable for different alkali flow rates, such as the third chamber 3331 is suitable for smaller alkali flow rates, and the size of the third chamber 3331 is flexible and diverse. There is no specific limitation on the shape of the third chamber 3331.

Alternatively, the third chamber 3331 is located at the lower part of the first positive electrode surface 331, the third chamber 3331 is connected to the third alkali inlet through hole 3341 and the third alkali return through hole 3342, and the volume of the third chamber 3331 is less than or equal to 1/16 of the volume of the intermediate plate body 333. The volume of the third chamber 3331 is half that of the first chamber 3331, and the volume of the third chamber 3331 is smaller. The third chamber 3331 is suitable for different alkali solution flow rates, such as the third chamber 3331 is suitable for smaller alkali solution flow rates, and the size of the third chamber 3331 is flexible and diverse. The shape of the third chamber 3331 is not specifically limited.

In summary, compared with the volume of the intermediate plate body 333, the volume of the third chamber 3331 is smaller, and the third chamber 3331 is suitable for different alkali solution flow rates, for example, the third chamber 3331 is suitable for a smaller alkali solution flow rate, and the size of the third chamber 3331 is flexible and diverse.

Alternatively, the third chamber 3331 is not disposed inside the intermediate plate body 333, but is located at the lower part of the intermediate frame 334, and is directly formed by the third alkali inlet through hole 3341 and the third return alkali solution through hole 3342. The volume of the third chamber 3331 is smaller, and it is suitable for a smaller alkali solution flow rate. The shape of the third chamber 3331 can be a waist-shaped chamber, etc., and the shape of the third chamber 3331 is not specifically limited.

Optionally, the fourth chamber 3332 extends from the lower part of the second positive electrode surface 332 to the top of the second positive electrode surface 332, the fourth chamber 3332 is connected to the fourth alkali inlet through hole 3343 and the fourth alkali return through hole 3344, and the volume of the fourth chamber 3332 is less than 1/2 of the volume of the intermediate plate body 333, and greater than 1/4 of the volume of the intermediate plate body 333. The volume of the intermediate plate body 333 refers to the volume of the space occupied by the intermediate plate body 333. Relative to half the volume of the intermediate plate body 333, the volume of the fourth chamber 3332 is smaller, and the fourth chamber 3332 is suitable for different alkali liquid flow rates, such as the fourth chamber 3332 is suitable for a smaller alkali liquid flow rate, and the size of the fourth chamber 3332 is flexible and diverse. The shape of the fourth chamber 3332 is not specifically limited.

Or, optionally, the fourth chamber 3332 extends from the lower part of the second positive electrode surface 332 to the top of the second positive electrode surface 332, the fourth chamber 3332 and the fourth alkali inlet through hole 3343 and the fourth alkali return through hole 3344 are all connected, and the volume of the fourth chamber 3332 is less than or equal to 1/4 of the volume of the intermediate plate body 333. The volume of the intermediate plate body 333 refers to the volume of the space occupied by the intermediate plate body 333. Relative to half the volume of the intermediate plate body 333, the volume of the fourth chamber 3332 is smaller, and the fourth chamber 3332 is suitable for different alkali liquid flow rates, such as the fourth chamber 3332 is suitable for a smaller alkali liquid flow rate, and the size of the fourth chamber 3332 is flexible and diverse. The shape of the fourth chamber 3332 is not specifically limited.

Alternatively, the fourth chamber 3332 extends from the lower portion of the second positive electrode surface 332 to the middle region of the second positive electrode surface 332, where the middle region refers to the geometric center of the second positive electrode surface 332 and its vicinity. The fourth chamber 3332 is connected to the fourth alkali inlet through hole 3343 and the fourth alkali return through hole 3344, and the volume of the fourth chamber 3332 is less than or equal to 1/8 of the volume of the intermediate plate body 333. Compared with half the volume of the intermediate plate body 333, the volume of the fourth chamber 3332 is smaller, and the fourth chamber 3332 is smaller. It is suitable for different alkali liquid flow rates, for example, the fourth chamber 3332 is suitable for a smaller alkali liquid flow rate. Moreover, the size of the fourth chamber 3332 is flexible and diverse. The shape of the fourth chamber 3332 is not specifically limited.

Or, optionally, the fourth chamber 3332 is located at the lower part of the second positive electrode surface 332, the fourth chamber 3332 and the fourth alkali inlet through hole 3343 and the fourth return alkali solution through hole 3344 are all connected, and the volume of the fourth chamber 3332 is less than or equal to 1/16 of the volume of the intermediate plate body 333, and the volume of the fourth chamber 3332 is smaller than half the volume of the intermediate plate body 333, and the fourth chamber 3332 is suitable for different alkali solution flow rates, such as the fourth chamber 3332 is suitable for a smaller alkali solution flow rate, and the size of the fourth chamber 3332 is flexible and diverse. The shape of the fourth chamber 3332 is not specifically limited.

In summary, compared with the volume of the intermediate plate body 333, the volume of the fourth chamber 3332 is smaller, and the fourth chamber 3332 is suitable for different alkali liquid flow rates, for example, the fourth chamber 3332 is suitable for a smaller alkali liquid flow rate, and the size of the fourth chamber 3332 is flexible and diverse.

Alternatively, the fourth chamber 3332 is not disposed inside the intermediate plate body 333, but is located at the lower part of the intermediate pole frame 334, and is directly formed by the fourth alkali inlet through hole 3343 and the fourth return alkali solution through hole 3344. The volume of the fourth chamber 3332 is smaller and suitable for a smaller alkali solution flow rate. The shape of the fourth chamber 3332 can be a waist-shaped chamber, etc., and the shape of the fourth chamber 3332 is not specifically limited.

In the specific embodiment provided in the present application, in order to further independently control the alkali solution introduced into each electrolytic chamber 4, multiple alkali solution inlets can be connected to multiple alkali solution circulation pumps one by one to form multiple alkali solution input channels, and each alkali solution input channel is provided with a control valve, so that the alkali solution on the path can be regulated by the control valve. The control valve can be an automatic regulating valve or a manual valve, and the control valve can set the valve opening according to the flow requirement, so as to control the flow of the alkali solution in each alkali solution input channel to be the same.

In the specific implementation manner provided in the present application, in order to facilitate observation of the alkali solution flow rate on each path, a flow meter may be provided on each alkali solution input channel.

When in use, referring to Figures 1 to 6, the flow paths of the alkali solution are roughly divided into two, wherein the first path is to turn back inside the bipolar plate 1, and the second path is to turn back inside the positive plate 3. Specifically, in the first path, the alkali solution is passed from the alkali solution inlet on the end pressure plate on one side of the negative plate 2 into the first chamber 131 of the bipolar plate 1, and then turns back after passing through the first chamber 131 and enters the corresponding electrolysis chamber 4 through the first turning alkali solution through hole 142, where an electrolysis reaction occurs and hydrogen or oxygen is generated, after which the hydrogen mixed with the alkali solution and the oxygen mixed with the alkali solution are respectively discharged from their respective gas-liquid mixing channels through the gas-liquid mixing outlet on the end pressure plate on one side of the negative plate 2; in the second path, the alkali solution is passed from the alkali solution inlet on the end pressure plate on one side of the negative plate 2. It enters the second chamber 311 of the positive electrode plate 3, and then returns after passing through the second chamber 311 and enters the corresponding electrolysis chamber 4 through the second return alkali solution through hole 322, where an electrolysis reaction occurs and hydrogen or oxygen is generated. After that, the hydrogen mixed with alkali solution and the oxygen mixed with alkali solution pass through their respective gas-liquid mixing channels and are discharged from the gas-liquid mixing outlet on the end pressure plate on one side of the negative electrode plate 2.

It should be noted that, in the above process, if the electrolytic cell shown in FIG. 7 is used, then in the second path, the alkaline solution flows into the third chamber 3331 or the fourth chamber 3332 of the intermediate electrode 33 and returns after passing through the corresponding chamber.

It should also be noted that in all the embodiments of the above application, the through hole can be a circular hole, an elliptical hole, or any other suitable hole shape. The present application does not limit this and the specific shape can be flexibly selected according to actual conditions.

The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.

The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

References herein to "one embodiment," "embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. In addition, please note that examples of the term "in one embodiment" do not necessarily all refer to the same embodiment.

In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A bipolar plate, wherein the bipolar plate has a first side surface and a second side surface arranged opposite to each other, the bipolar plate includes a bipolar plate body and a first pole frame fixedly arranged on the periphery of the bipolar plate body, a first chamber is formed inside the bipolar plate body; on the first side surface, a first alkali inlet through hole and a first alkali liquid return through hole connected to the first chamber are respectively arranged on the first pole frame, the first alkali liquid return through hole is used to draw out the alkali liquid in the first chamber and change the flow direction of the alkali liquid.
The bipolar plate according to claim 1, wherein the first alkali inlet through hole and the first alkali solution return through hole are both located at the lower part of the first pole frame.
The bipolar plate according to claim 1, wherein, on the first side, the first pole frame is provided with a first through groove in the radial direction, and the first return alkali solution through hole is used to communicate with the electrolysis chamber where the first side is located through the first through groove.
The bipolar plate according to claim 1, wherein the first chamber extends from a lower portion of a first side surface of the bipolar plate to a top portion of the first side surface, and a volume of the first chamber is smaller than a volume of the bipolar plate body and larger than 1/2 of a volume of the bipolar plate body;

Or, the first chamber extends from the lower portion of the first side of the bipolar plate to the top of the first side, and the volume of the first chamber is less than or equal to 1/2 of the volume of the bipolar plate body;

Or, the first chamber extends from the lower portion of the first side surface of the bipolar plate to the middle area of the first side surface, and the volume of the first chamber is less than or equal to 1/4 of the volume of the bipolar plate body;

Alternatively, the first chamber is located at a lower portion of a first side surface of the bipolar plate, and a volume of the first chamber is less than or equal to 1/8 of a volume of the bipolar plate body.
The bipolar plate according to claim 1, wherein, on the second side, the lower part of the first pole frame is respectively provided with an alkali solution distribution blind hole along the axial direction and a second through groove along the radial direction, and the alkali solution distribution blind hole is used to communicate with the electrolysis chamber where the second side is located through the second through groove.
An electrolytic cell, comprising an end pressure plate and a positive plate and a negative plate arranged opposite to each other, wherein the end pressure plate is arranged on the outer side of the negative plate, and the electrolytic cell further comprises a plurality of bipolar plates according to any one of claims 1 to 5, wherein the plurality of bipolar plates are arranged side by side and spaced apart between the positive plate and the negative plate, and the first side surfaces of the plurality of bipolar plates are all arranged toward the negative plate; the first alkali inlet through holes in any two of the bipolar plates are arranged on different straight lines along the axial direction to form a plurality of alkali solution inflow channels of different lengths in the electrolytic cell; the first return alkali solution through holes in any two of the bipolar plates are arranged on the same straight line or on straight lines parallel to each other along the axial direction; a plurality of alkali solution inlet through holes corresponding to the first alkali inlet through holes in the plurality of bipolar plates are provided on the end pressure plate mouth.
The electrolytic cell according to claim 6, wherein a plurality of the bipolar plates are equidistantly arranged in the electrolytic cell along the axial direction to form alkali solution distribution channels of equal length.
The electrolytic cell according to claim 6, wherein the electrolytic cell has a positive electrode plate and a negative electrode plate, and the bipolar plate is arranged between one of the positive electrode plates and the negative electrode plate.
The electrolytic cell according to claim 8, wherein the positive electrode plate comprises a positive electrode plate body and a second electrode frame fixedly arranged on the periphery of the positive electrode plate body, a second chamber is formed in the positive electrode plate body, and a second alkali inlet through hole and a second alkali liquid return through hole communicating with the second chamber are respectively arranged on the side of the second electrode frame opposite to the negative electrode plate, and the second alkali liquid return through hole is used to draw out the alkali liquid in the second chamber and change the flow direction of the alkali liquid.
The electrolytic cell according to claim 9, wherein the second chamber extends from the lower part of the side opposite to the negative electrode plate to the top of the side opposite to the negative electrode plate, and the volume of the second chamber is smaller than the volume of the positive electrode plate body and larger than 1/2 of the volume of the positive electrode plate body;

Or, the second chamber extends from the lower part of the side opposite to the negative electrode plate to the top of the side opposite to the negative electrode plate, and the volume of the second chamber is less than or equal to 1/2 of the volume of the positive electrode plate body;

Or, the second chamber extends from the lower part of the side opposite to the negative electrode plate to the middle area of the side opposite to the negative electrode plate, and the volume of the second chamber is less than or equal to 1/4 of the volume of the positive electrode plate body;

Alternatively, the second chamber is located at a lower portion of a side surface opposite to the negative electrode plate, and a volume of the second chamber is less than or equal to 1/8 of a volume of the positive electrode plate body.
The electrolytic cell according to claim 6, wherein the electrolytic cell comprises a positive electrode plate and two negative electrode plates, the positive electrode plate is configured as an intermediate electrode plate, the intermediate electrode plate is disposed between the two negative electrode plates and has a first positive electrode surface and a second positive electrode surface disposed opposite to each other, wherein the first positive electrode surface is opposite to one of the negative electrode plates, and the second positive electrode surface is opposite to the other negative electrode plate.
The electrolytic cell according to claim 11, wherein the intermediate electrode plate comprises an intermediate electrode plate body and an intermediate electrode frame fixedly arranged on the periphery of the intermediate electrode plate body, a third chamber and a fourth chamber are formed side by side inside the intermediate electrode plate body, and on the first positive electrode surface, a third alkali inlet through hole and a third alkali return through hole communicating with the third chamber are respectively arranged on the intermediate electrode frame; on the second positive electrode surface, a fourth alkali inlet through hole and a fourth alkali return through hole communicating with the fourth chamber are respectively arranged on the intermediate electrode frame, wherein the third alkali return through hole is used to lead out the third chamber The fourth return alkali liquid through hole is used to lead out the alkali liquid in the fourth chamber and change the flow direction of the alkali liquid.
The electrolytic cell according to claim 12, wherein the third chamber extends from the lower part of the first electrode surface to the top of the first electrode surface, and the volume of the third chamber is less than 1/2 of the volume of the positive electrode plate body and greater than 1/4 of the volume of the positive electrode plate body;

Or, the third chamber extends from the lower part of the first electrode surface to the top of the first electrode surface, and the volume of the third chamber is less than or equal to 1/4 of the volume of the intermediate plate body;

Or, the third chamber extends from the lower part of the first electrode surface to the middle area of the first electrode surface, and the volume of the third chamber is less than or equal to 1/8 of the volume of the intermediate electrode body;

Alternatively, the third chamber is located at the lower part of the first electrode surface, and the volume of the third chamber is less than or equal to 1/16 of the volume of the intermediate electrode body.
The electrolytic cell according to claim 12, wherein the fourth chamber extends from the lower part of the second electrode surface to the top of the second electrode surface, and the volume of the fourth chamber is less than 1/2 of the volume of the positive electrode plate body and greater than 1/4 of the volume of the positive electrode plate body;

Or, the fourth chamber extends from the lower part of the second electrode surface to the top of the second electrode surface, and the volume of the fourth chamber is less than or equal to 1/4 of the volume of the intermediate electrode body;

Or, the fourth chamber extends from the lower part of the second electrode surface to the middle area of the second electrode surface, and the volume of the fourth chamber is less than or equal to 1/8 of the volume of the intermediate electrode body;

Alternatively, the fourth chamber is located at the lower part of the second electrode surface, and the volume of the third chamber is less than or equal to 1/16 of the volume of the intermediate electrode body.
The electrolytic cell according to any one of claims 6 to 14, wherein the plurality of alkali solution inlets are connected one-to-one with the plurality of alkali solution circulation pumps to form a plurality of alkali solution input channels, and each of the alkali solution input channels is provided with a control valve.
The electrolytic cell according to claim 15, wherein a flow meter is also provided on each of the alkali solution input channels.