Bipolar plate for preventing bypass current of AEM electrolytic bath

Abstract

The utility model discloses a bipolar plate for preventing bypass current of an AEM electrolytic bath, and relates to the technical field of electrolytic baths. Comprising a fixing plate, a liquid inlet hole, a liquid outlet hole, a decomposing tank and connecting grooves are formed in the fixing plate, the liquid inlet hole and the liquid outlet hole both penetrate through one side of the fixing plate, a conducting pipe for controlling the flow speed of electrolyte is arranged between the liquid outlet hole and the liquid inlet hole, the connecting grooves are formed in the two ends of the decomposing tank, and the connecting grooves communicate with the conducting pipe; the conducting pipe comprises a liquid outlet manifold and a liquid inlet manifold, the liquid outlet manifold is communicated with the liquid outlet hole, and the liquid inlet manifold is communicated with the liquid inlet hole. The fixed plate, the liquid outlet manifold, the liquid inlet manifold, the decomposition tank, the liquid inlet hole and the liquid outlet hole are matched, so that bubbles generated in the electrolysis process can be guided to a specific position in the electrolysis process, a bubble barrier is formed, bypass current is blocked, and the situation that part of energy cannot be effectively used for the electrolysis process due to the generation of the bypass current is avoided; therefore, the electrolysis efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cells, and particularly relates to a bipolar plate for preventing bypass current in an AEM electrolytic cell. Background Art

[0002] In the technology of electrolytic water hydrogen production, the design and performance of the electrolytic cell play a crucial role in the efficiency and stability of the entire system. The anion exchange membrane (AEM) electrolytic cell is a new type of electrolytic cell structure. Compared with the traditional proton exchange membrane (PEM) electrolytic cell, the AEM electrolytic cell has the following advantages: the material cost of the AEM electrolytic cell is lower because the anion exchange membrane can use non-precious metal catalysts, while the PEM electrolytic cell usually needs to use precious metal catalysts such as platinum; the AEM electrolytic cell operates under alkaline conditions, which can reduce corrosion problems and improve the durability of the system; the AEM electrolytic cell can generate high-purity hydrogen and is suitable for high-demand industrial applications.

[0003] However, the AEM electrolytic cell also faces some challenges. One of them is the bypass current phenomenon. Bypass current refers to the situation where part of the current in the electrolytic cell fails to pass through the predetermined electrolysis path but flows through the common channel or other paths. The bypass current will cause part of the energy not to be effectively used in the electrolysis process, thereby reducing the overall energy efficiency of the system. Therefore, a bipolar plate for preventing bypass current in the AEM electrolytic cell is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the bypass current will cause part of the energy not to be effectively used in the electrolysis process, thereby reducing the overall energy efficiency of the system. The utility model provides a bipolar plate for preventing bypass current in an AEM electrolytic cell.

[0005] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0006] A bipolar plate for preventing bypass current in an AEM electrolytic cell includes a fixing plate. Liquid inlet holes, liquid outlet holes, decomposition tanks and connection grooves are respectively formed inside the fixing plate. The liquid inlet holes and the liquid outlet holes penetrate through one side of the fixing plate. A conduction tube for controlling the flow rate of the electrolyte is arranged between the liquid outlet hole and the liquid inlet hole. The connection grooves are arranged at both ends of the decomposition tank and are communicated with the conduction tube.

[0007] Further, the conduction tube includes a liquid outlet manifold and a liquid inlet manifold, and the liquid outlet manifold is communicated with the liquid outlet hole, and the liquid inlet manifold is communicated with the liquid inlet hole. There are multiple decomposition tanks, and the multiple decomposition tanks are parallel to each other. A diversion groove for distributing the electrolyte is further arranged inside the fixing plate.

[0008] Further, the diversion channels include a first current-limiting channel and a second current-limiting channel, and the first current-limiting channel and the second current-limiting channel communicate with the decomposition tank. The first current-limiting channel is arranged between the liquid outlet manifold and the decomposition tank, and the second current-limiting channel is arranged between the liquid inlet manifold and the decomposition tank. The first current-limiting channel and the second current-limiting channel communicate with the liquid outlet manifold and the liquid inlet manifold respectively.

[0009] Further, there are multiple first current-limiting channels and second current-limiting channels, and the multiple first current-limiting channels and second current-limiting channels correspond to the decomposition tank.

[0010] Further, the fixing plate is internally provided with electrode plates.

[0011] The beneficial effects of the present utility model are as follows:

[0012] Through the cooperation of the fixing plate, the liquid outlet manifold, the liquid inlet manifold, the decomposition tank, the liquid inlet hole and the liquid outlet hole, during the electrolysis process, the bubbles generated during the electrolysis process can be guided to a specific position to form a bubble barrier, blocking the bypass current and avoiding the generation of the bypass current, which causes part of the energy not to be effectively used in the electrolysis process, thereby improving the electrolysis efficiency.

[0013] Through the settings of the liquid outlet manifold, the liquid inlet manifold, the first current-limiting channel and the second current-limiting channel, it is realized that through the cooperation of the liquid outlet manifold, the liquid inlet manifold, the first current-limiting channel and the second current-limiting channel, the flow path of the electrolyte can be restricted, and the bubbles can be captured and concentrated to form a stable bubble barrier, effectively blocking the bypass path of the electrolyte. Description of the Drawings

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0015] Figure 2 is the front view of the present utility model;

[0016] Figure 3 is the sectional view taken along line A-A of the present utility model;

[0017] Figure 4 is the sectional view taken along line B-B of the present utility model;

[0018] Figure 5 is the present utility model Figure 3 magnified view of part A;

[0019] Figure 6 is the present utility model Figure 4 magnified view of part B;

[0020] Figure 7 is the schematic diagram of the equivalent circuit of the bypass current of the present utility model;

[0021] Figure 8It is a schematic diagram of the electron flow direction of the present utility model;

[0022] Reference numerals in the drawings: 1, fixed plate; 100, liquid inlet hole; 101, decomposition tank; 102, first current-limiting groove; 103, liquid outlet manifold; 104, liquid outlet hole; 105, second current-limiting groove; 106, liquid inlet manifold; 107, connecting groove. Specific embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0025] It should be noted that: Similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0026] All the electrical components appearing in this article are electrically connected to an external main controller and 220V mains power, and the main controller can be a conventional known device such as a computer for control.

[0027] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", "above", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0028] Such as Figures 1 to 8As shown in the figure, a bipolar plate for preventing bypass current in an AEM electrolyzer includes a fixing plate 1. Inside the fixing plate 1, a liquid inlet hole 100, a liquid outlet hole 104, a decomposition tank 101, and a connection groove 107 are respectively provided. Both the liquid inlet hole 100 and the liquid outlet hole 104 penetrate through one side of the fixing plate 1. A conduction pipe for controlling the flow rate of the electrolyte is provided between the liquid outlet hole 104 and the liquid inlet hole 100. The connection groove 107 is arranged at both ends of the decomposition tank 101, and the connection groove 107 is communicated with the conduction pipe. Specifically, during use, the electrolyte enters from the liquid inlet hole 100 and flows out from the liquid outlet hole 104 through the liquid inlet manifold 106, the decomposition tank 101, and the liquid outlet manifold 103. During the electrolysis process, bubbles are generated in the electrolyte in the decomposition tank 101, so that the gas, the liquid outlet manifold 103, and the decomposition tank 101 are used to increase the resistance from the liquid inlet hole 100 to the liquid outlet hole 104, thereby avoiding the generation of bypass current.

[0029] As Figures 1 to 8 shown, the conduction pipe includes a liquid outlet manifold 103 and a liquid inlet manifold 106, and the liquid outlet manifold 103 is communicated with the liquid outlet hole 104, and the liquid inlet manifold 106 is communicated with the liquid inlet hole 100. There are multiple decomposition tanks 101, and the multiple decomposition tanks 101 are parallel to each other. A diversion groove for distributing the electrolyte is also provided inside the fixing plate 1. Specifically, the shapes of the liquid outlet manifold 103 and the liquid inlet manifold 106 can be C-shaped or serpentine, so as to extend the flow path of the electrolyte, thereby increasing the internal resistance of the bypass current in this area, reducing the formation of bypass current, making the current more evenly distributed on the surface of the bipolar plate, reducing energy loss, not only improving the electrolysis efficiency, but also effectively extending the service life of the electrolyzer. The decomposition tank 101 can be a serpentine groove or a straight groove. In this practical application, a serpentine groove is adopted. Compared with a straight groove, the serpentine groove increases the residence time and flow spacing of the electrolyte inside the decomposition tank 101 during the electrolysis process, ensuring that the electrolyte can be fully electrolyzed while further increasing the resistance between the liquid inlet hole 100 and the liquid outlet hole 104, thereby further reducing the bypass current.

[0030] As Figures 1 to 8As shown in the figure, the diversion channels include a first current-limiting channel 102 and a second current-limiting channel 105. The first current-limiting channel 102 and the second current-limiting channel 105 are connected to the decomposition tank 101. The first current-limiting channel 102 is arranged between the liquid outlet manifold 103 and the decomposition tank 101, and the second current-limiting channel 105 is arranged between the liquid inlet manifold 106 and the decomposition tank 101. The first current-limiting channel 102 and the second current-limiting channel 105 are respectively connected to the liquid outlet manifold 103 and the liquid inlet manifold 106. Specifically, the cross-sectional areas of both the second current-limiting channel 105 and the first current-limiting channel 102 are smaller than that of the decomposition tank 101. By reducing the flow rate of the electrolyte, the resistance when the electrolyte flows towards the liquid outlet manifold 103 is increased. Such a design not only slows down the flow rate of the electrolyte but also forces the electrolyte to be more evenly distributed inside the decomposition tank 101 during the flow process, thereby reducing the formation probability of bypass current. When the electrolyte passes through the liquid inlet manifold 106, the narrow liquid inlet manifold 106 can form a physical barrier, reducing the flow rate of the electrolyte here and causing more bubbles to be captured and concentrated in this section. After electrolysis, a large number of bubbles are generated in the area of the decomposition tank 101, and the bubbles move upward along the decomposition tank 101. After the moving bubbles are guided to the first current-limiting channel 102, due to the narrowness of the liquid outlet manifold 103, liquid interruption and a bubble barrier will be formed to prevent the continuous flow of the electrolyte. Since the bubbles have a large volume and low conductivity, the resistance when the electrolyte flows towards the liquid outlet hole 104 is effectively increased. As Figure 7 shown, where R fixed plate 1, R2,..., Rn can be understood as the resistance of the electrolyte solution within the effective area of the decomposition tank 101, and the current passing through this resistance is the effective current of the decomposition tank 101; where R11, R21,..., Rn fixed plate 1, and R11’, R21’,..., Rn fixed plate 1’ are the resistances of the electrolyte from the effective area to the liquid inlet manifold 106 and the liquid outlet manifold 103; R12, R22,..., Rn2, and R12’, R22’,..., Rn2’ are the resistances of the electrolyte within the liquid inlet manifold 106 and the liquid outlet manifold 103, and the current flowing through these parts of the resistance is the bypass current. The flow channels designed in this application, because they narrow the cross-sectional areas of the liquid inlet manifold 106 and the liquid outlet manifold 103, increase the flow channel length, and form a bubble barrier, thus greatly increasing the resistance of the electrolyte from the liquid inlet manifold 106 to the effective area and the liquid outlet manifold 103, that is, R11’, R21’,..., Rn fixed plate 1’, and R11, R21,..., Rn fixed plate 1, thereby reducing or even eliminating the existence of bypass current.

[0031] As Figures 1 to 8 shown, there are multiple first current-limiting channels 102 and second current-limiting channels 105, and the multiple first current-limiting channels 102 and second current-limiting channels 105 correspond to the decomposition tank 101. Specifically, the design of the multiple first current-limiting channels 102 and second current-limiting channels 105 ensures the electrolysis efficiency while controlling the electrolyte flow rate.

[0032] As Figures 1 to 8 shown, a plate is provided inside the fixing plate 1. Specifically, when in use, the current is conducted through the plate so that the current can electrolyze the liquid. The plate is a prior art and will not be explained in detail here.

[0033] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bipolar plate for preventing bypass current in an AEM electrolyzer, characterized in that: The invention comprises a fixed plate (1), wherein a liquid inlet hole (100), a liquid outlet hole (104), a decomposition groove (101) and a connecting groove (107) are respectively provided inside the fixed plate (1), wherein the liquid inlet hole (100) and the liquid outlet hole (104) both pass through one side of the fixed plate (1), a conducting pipe for controlling the flow rate of the electrolyte is provided between the liquid outlet hole (104) and the liquid inlet hole (100), and the connecting groove (107) is provided at both ends of the decomposition groove (101), and the connecting groove (107) is connected to the conducting pipe.

2. A bipolar plate for preventing bypass current in an AEM electrolyzer according to claim 1, characterized in that: The conducting pipe comprises a liquid outlet manifold (103) and a liquid inlet manifold (106), wherein the liquid outlet manifold (103) is connected to the liquid outlet hole (104), and the liquid inlet manifold (106) is connected to the liquid inlet hole (100). There are a plurality of decomposition tanks (101), and the plurality of decomposition tanks (101) are arranged in parallel with each other. A guide tank for distributing electrolyte is also provided inside the fixed plate (1).

3. A bipolar plate for preventing bypass current in an AEM electrolyzer according to claim 2, characterized in that: The flow guide groove comprises a first flow limiting groove (102) and a second flow limiting groove (105), and the first flow limiting groove (102) and the second flow limiting groove (105) are connected to the decomposition groove (101), the first flow limiting groove (102) is arranged between the liquid outlet manifold (103) and the decomposition groove (101), and the second flow limiting groove (105) is arranged between the liquid inlet manifold (106) and the decomposition groove (101), and the first flow limiting groove (102) and the second flow limiting groove (105) are respectively connected to the liquid outlet manifold (103) and the liquid inlet manifold (106).

4. A bipolar plate for preventing bypass current in an AEM electrolyzer according to claim 3, characterized in that: There are a plurality of the first flow limiting grooves (102) and the second flow limiting grooves (105), and the plurality of the first flow limiting grooves (102) and the second flow limiting grooves (105) correspond to the decomposition groove (101).

5. A bipolar plate for preventing bypass current in an AEM electrolyzer according to claim 1, characterized in that: The fixing plate (1) is provided with a pole plate inside.

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