Anode frame and cathode frame of electrolytic cell

Abstract

The utility model discloses an anode frame and a cathode frame of an electrolytic bath, and relates to the technical field of electrolytic baths, the middle part of the anode frame is a first hollow area, the anode frame is provided with a first pure water / alkali liquor flow channel opening, and a plurality of first flow channels are arranged between the first pure water / alkali liquor flow channel opening and the first hollow area; the plurality of first flow channels comprise a plurality of first middle tooth-shaped flow channels and a plurality of first lateral tooth-shaped flow channels which are symmetrically arranged on the two sides of the plurality of first middle tooth-shaped flow channels; first embedded grooves are formed along the front surface and the back surface of the anode frame, and sealing strips are embedded in the first embedded grooves; the utility model discloses an electrolytic cell cathode frame. The flow channels are divided into the middle tooth-shaped flow channels and the lateral tooth-shaped flow channels symmetrically arranged on the two sides of the middle tooth-shaped flow channels, electrolyte can be rapidly guided into the hollow area, the front faces and the back faces of the anode frame and the cathode frame are provided with the embedded grooves, the sealing strips are embedded into the embedded grooves, and therefore sealing materials can be saved, and the service life of the battery is prolonged. The thickness of the electrolytic bath is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cells, in particular to an anode frame design for PEM and AEM electrolytic cells. Background Art

[0002] The main technologies for producing hydrogen by electrolysis of water include alkaline water electrolyzer (AE), proton exchange membrane water electrolyzer (PEM), alkaline ion exchange membrane electrolyzer (AEM) and solid oxide water electrolyzer (SOE). Currently, the common PEM electrolyzer and AEM electrolyzer both have bipolar plates and anode frames.

[0003] The main components of the electrolyzer include membrane electrode, porous transport layer, anode frame and plate, etc. When assembling the membrane electrode, the general design is to first package the membrane electrode, that is, seal the membrane electrode edge, and then install it between the anode frame and the cathode frame. This installation method is time-consuming, material-consuming and labor-intensive. In addition, the sealing design of the electrolyzer stack is flat, that is, a large-area sealing sheet is sandwiched between the plate and other structural parts, which consumes a lot of materials, or an embedded seal is directly made on the metal plate, and sealing on the metal plate requires the thickness of the metal to be increased.

[0004] In addition, the membrane electrode is laid in the hollow area of ​​the anode frame, and the anode frame has a pure water / alkaline solution flow channel outlet. Usually, there are multiple parallel flow channels or no flow channels on the surface between the pure water / alkaline solution flow channel outlet and the hollow area. The electrolyte is transported to the membrane electrode through the pure water / alkaline solution flow channel outlet and the parallel flow channels. The use of parallel flow channels or no flow channels may result in a large amount of electrolyte transported to the membrane electrode directly in front of the parallel flow channels, and a small amount of electrolyte transported to the left and right sides in front of the parallel flow channels, that is, the electrolyte cannot be evenly distributed on the membrane electrode.

[0005] For example, the Chinese utility model patent with patent number CN218880072U discloses a diffusion layer structure and a proton exchange membrane water electrolyzer, including a synthetic diffusion layer, a first anode frame, a second anode frame and a cathode diffusion layer, the first anode frame is provided with a first through hole, the second anode frame is provided with a second through hole, and the synthetic diffusion layer is sleeved in the first through hole, the cathode diffusion layer is sleeved in the second through hole, the first anode frame is provided with a first guide hole, the second anode frame is provided with a second guide hole, and the cathode diffusion layer is sleeved in the second through hole. Figure 1 It can be seen that no flow channel is provided between the guide hole and the through hole on the first anode frame and the second anode frame.

[0006] In addition, the Chinese utility model patent with patent number CN219861605U discloses a PEM electrolyzer, including an anode frame and a cathode frame, wherein the middle of the anode frame and the cathode frame form a hollow area, and the left and right sides of the anode frame and the cathode frame are provided with a manifold inlet and outlet, and the anode frame and the cathode frame are provided with a manifold inlet and outlet. Figure 4 It can be seen that there is no flow channel between the manifold inlet and outlet and the hollow area of ​​the anode anode frame and the cathode anode frame.

[0007] Therefore, it is urgent to invent an electrolytic cell frame that can reduce the thickness of the electrolytic cell and has a new flow channel design. Utility Model Content

[0008] Based on this, it is necessary to provide a frame for PEM and AEM electrolytic cells to address the above technical problems, the frame including an anode frame and a cathode frame.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] An electrolytic cell anode frame, the anode frame having a front side and a back side, the contact surface of the anode frame with the electrode plate being the front side, and the contact surface of the anode frame with the membrane electrode being the back side, characterized in that:

[0011] The middle part of the anode frame is a first hollow area, the first hollow area penetrates the anode frame along the thickness direction of the anode frame, at least two first pure water / alkaline solution flow channel openings are provided on the left and right sides of the anode frame along its length direction, a plurality of first flow channels are provided between each of the first pure water / alkaline solution flow channel openings and the first hollow area, and the first pure water / alkaline solution flow channel openings and the first hollow area are connected through the plurality of first flow channels;

[0012] The plurality of first flow channels include a plurality of first intermediate toothed flow channels and a plurality of first lateral toothed flow channels symmetrically arranged on both sides of the plurality of first intermediate toothed flow channels, the plurality of first intermediate toothed flow channels are parallel to each other, and the plurality of first lateral toothed flow channels are inclined in a direction away from the first intermediate toothed flow channels;

[0013] A first embedded groove is provided along the front and back sides of the anode frame. The first embedded groove is located in a circle outside at least two first pure water / alkali solution flow channel openings, and a sealing strip is embedded in the first embedded groove.

[0014] By adopting the above technical solution, multiple first flow channels are divided into a first intermediate serrated flow channel and a plurality of first lateral serrated flow channels symmetrically arranged on both sides of the multiple first intermediate serrated flow channels. The electrolyte can be quickly introduced from the first intermediate serrated flow channel and the first lateral serrated flow channel into the first hollow area, that is, on the membrane electrode clamped in the anode frame, and the first lateral serrated flow channel can make the electrolyte more evenly distributed on the membrane electrode.

[0015] A first embedded groove is provided on the front and back sides of the anode frame, and a sealing strip is embedded therein to achieve sealing between the anode frame and the electrode plate, and between the anode frame and the membrane electrode. Since no groove for sealing is provided on the metal electrode plate, the thickness of the electrode plate can be reduced, or the sealing sheet between the anode frame and the electrode plate can be omitted, thereby reducing the thickness of the entire electrolytic cell.

[0016] Preferably, a plurality of first dot-shaped protrusions are evenly arranged on the end surface of the back side of the anode frame close to the first hollow area.

[0017] By adopting the above technical solution, the first dot-shaped protrusion can play a role in supporting the membrane electrode, which can be very convenient for laying the membrane electrode, eliminating the process of packaging the membrane electrode with the anode frame, and directly bite the anode frame packaging of the membrane electrode on the back of the anode frame. At the same time, the porous transmission layer of the electrolyzer is arranged in the first hollow area, and the first dot-shaped protrusion can also clamp the porous transmission layer, which is convenient for installing the porous transmission layer on the anode frame.

[0018] Preferably, the anode frame is made of engineering plastics and is integrally injection molded.

[0019] By adopting the above technical solution and designing a flow channel or flow field on the engineering plastic anode frame, the production cost can be reduced.

[0020] Preferably, the anode frame has a rectangular shape, and the anode frame is suitable for a PEM electrolyzer or an AEM electrolyzer.

[0021] Preferably, the first pure water / alkaline solution flow channel opening has a rectangular shape.

[0022] By adopting the above technical solution, the rectangular first pure water / alkaline solution flow channel opening is directly opposite to the multiple first flow channels, which facilitates the rapid entry of the electrolyte into the multiple first flow channels.

[0023] A cathode frame of an electrolytic cell, wherein the middle portion of the cathode frame is a second hollow area, the second hollow area penetrates the cathode frame along the thickness direction of the cathode frame, at least two second pure water / alkaline solution flow channel openings are provided on the upper and lower sides of the cathode frame along the width direction thereof, a plurality of second flow channels are provided between each of the second pure water / alkaline solution flow channel openings and the second hollow area, and the second pure water / alkaline solution flow channel openings and the second hollow area are connected via the plurality of second flow channels;

[0024] The plurality of second flow channels include a plurality of second intermediate toothed flow channels and a plurality of second lateral toothed flow channels symmetrically arranged on both sides of the plurality of second intermediate toothed flow channels, the plurality of second intermediate toothed flow channels are parallel to each other, and the plurality of second lateral toothed flow channels are inclined in a direction away from the second intermediate toothed flow channels;

[0025] Second embedded grooves are provided along the front and back sides of the cathode frame. The second embedded grooves are located in a circle outside the plurality of second pure water / alkali solution flow channel openings. A sealing strip is embedded in the second embedded grooves.

[0026] Preferably, a plurality of second dot-shaped protrusions are evenly arranged on the end surface of the back side of the cathode frame close to the second hollow area.

[0027] Compared with the related art, the anode frame and cathode frame of the electrolytic cell provided by the utility model have the following beneficial effects:

[0028] 1. Multiple flow channels are arranged between the pure water / alkaline solution flow channel outlet and the hollow area. The multiple flow channels are divided into a middle toothed flow channel and a plurality of lateral toothed flow channels symmetrically arranged on both sides of the middle toothed flow channels. The electrolyte can be quickly introduced from the middle toothed flow channel and the lateral toothed flow channel into the hollow area, and quickly enter the reaction area for electrochemical reaction. The lateral toothed flow channel can make the electrolyte more evenly distributed on the membrane electrode.

[0029] 2. The front and back sides of the anode frame and the cathode frame are provided with embedded grooves and embedded with sealing strips, which can save sealing materials and can be quickly formed and manufactured through dispensing or other processes. At the same time, due to the embedded design, the thickness of the entire electrolytic cell single cell will be greatly reduced, thereby greatly reducing the thickness of the electrolytic cell.

[0030] 3. The use of dot-shaped protrusions can support the membrane electrode, which is very convenient for laying the membrane electrode, eliminating the process of packaging the anode frame and cathode frame of the membrane electrode, and directly bite the membrane electrode packaging on the back of the anode frame and cathode frame. At the same time, the dot-shaped protrusions can also clamp the porous transmission layer of the electrolyzer to play a positioning role.

[0031] 4. The anode frame and the cathode frame are integrally injection molded with engineering plastics. Designing flow channels or flow fields on the frames made of engineering plastics can reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional diagram of the anode frame of the utility model;

[0033] Figure 2 This is a front view of the anode frame of the utility model;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is a back view of the anode frame of the utility model;

[0036] Figure 5It is a three-dimensional diagram of the cathode frame of the utility model;

[0037] Figure 6 It is a front view of the cathode frame of the utility model;

[0038] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0039] Figure 8 It is a back view of the cathode frame of the utility model.

[0040] Figure numerals: 10, anode frame; 101, front; 102, back; 103, first hollow area; 104, first pure water / alkaline solution flow channel outlet; 105, first flow channel; 1051, first intermediate serrated flow channel; 1052, first lateral serrated flow channel; 106, first embedded groove; 107, first dot-shaped protrusion; 20, cathode frame; 201, second hollow area; 202, second pure water / alkaline solution flow channel outlet; 203, second flow channel; 204, second intermediate serrated flow channel; 205, second lateral serrated flow channel; 206, second embedded groove; 207, second dot-shaped protrusion. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0042] It should be noted that, in the description of the present utility model, the same reference numerals are used in different drawings to indicate the same or similar components; in addition, please understand that the terms "first", "second", "upper", "lower",

[0043] The terms indicating directions or positional relationships, such as "left", "right", "length", "width" and "thickness", are based on the directions or positional relationships shown in the drawings and are merely for the convenience of description. They do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0044] Embodiment 1

[0045] See also Figures 1 to 4 As shown, an embodiment of the utility model provides an electrolytic cell anode frame, one side of the anode frame 10 is the front side 101, and the other side is the back side 102. The contact surface between the anode frame 10 and the electrode plate is the front side 101, and the contact surface between the anode frame 10 and the membrane electrode is the back side 102.

[0046] A first hollow area 103 for installing a porous transmission layer is provided in the middle of the anode frame 10, and the first hollow area 103 penetrates the anode frame 10 along the thickness direction of the anode frame 10, so that the porous transmission layer fits the membrane electrode. The shape of the anode frame 10 is rectangular, and a square can also be used. The present application adopts a rectangular anode frame 10, and at least two first pure water / alkaline solution flow channels 104 are provided on the left and right sides of the anode frame 10 along its length direction. Each first pure water / alkaline solution flow channel 104 is at the same distance from the first hollow area 103, and the first pure water / alkaline solution flow channel 104 is used to introduce electrolyte medium.

[0047] A plurality of first flow channels 105 are provided between each first pure water / alkaline solution flow channel opening 104 and the first hollow area 103, and the first pure water / alkaline solution flow channel opening 104 and the first hollow area 103 are connected through the plurality of first flow channels 105. The electrolyte is input from the first pure water / alkaline solution flow channel opening 104 into the plurality of first flow channels 105, and is uniformly introduced from the plurality of first flow channels 105 into the first hollow area 103.

[0048] Furthermore, in order to allow the electrolyte to be quickly and evenly introduced into the first hollow area 103, the multiple first flow channels 105 are divided into a plurality of first intermediate serrated flow channels 1051 and a plurality of first lateral serrated flow channels 1052 symmetrically arranged on both sides of the multiple first intermediate serrated flow channels 1051. The multiple first intermediate serrated flow channels 1051 are parallel to each other, and one end of the multiple first lateral serrated flow channels 1052 is inclined away from the first intermediate serrated flow channel 1051, and is distributed in an approximate "eight" shape on both sides of the first intermediate serrated flow channel 1051.

[0049] In addition, a first embedded groove 106 is provided along the front side 101 and the back side 102 of the anode frame 10. The first embedded groove 106 is located in a circle outside at least two first pure water / alkaline solution flow channel openings 104. By embedding a sealing strip in the first embedded groove 106, sealing materials can be greatly saved, and the sealing strip can be quickly formed and manufactured through dispensing or other processes. At the same time, due to the embedded design, the thickness of the entire electrolytic cell single cell can be greatly reduced, thereby greatly reducing the thickness of the electrolytic cell.

[0050] Furthermore, a plurality of first dot-shaped protrusions 107 are evenly arranged on the end surface of the back side 102 of the anode frame 10 close to the first hollow area 103. That is, it can play a role in supporting the membrane electrode, which can be very convenient for laying the membrane electrode, eliminating the process of packaging the membrane electrode with the anode frame 10, and directly bite the anode frame 10 packaging of the membrane electrode on the back side 102 of the anode frame 10. At the same time, the first dot-shaped protrusions 107 can also clamp the porous transmission layer of the electrolytic cell, playing a role in positioning the porous transmission layer.

[0051] In addition, the material of the anode frame 10 is engineering plastics, and is integrally injection molded. Designing a flow channel or flow field on the anode frame 10 made of engineering plastics can reduce production costs.

[0052] In addition, the first pure water / alkaline solution flow channel opening 104 is rectangular in shape, and the rectangular first pure water / alkaline solution flow channel opening 104 is directly opposite to the multiple first flow channels 105 , so as to facilitate the rapid introduction of the electrolyte into the multiple first flow channels 105 .

[0053] Embodiment 2

[0054] See also Figures 5 to 8 As shown, an embodiment of the utility model provides an electrolytic cell cathode frame, and a membrane electrode is installed between the anode frame 10 and the cathode anode frame 20. A second hollow area 201 for installing a porous transmission layer is provided in the middle of the cathode frame 20, and the second hollow area 201 penetrates the cathode frame 20 along the thickness direction of the cathode frame 20.

[0055] The cathode frame 20 has a rectangular shape, and at least two second pure water / alkaline liquid flow openings 202 are provided on the upper and lower sides of the cathode frame 20 along its width direction. A plurality of second flow channels 203 are provided between each second pure water / alkaline liquid flow opening 202 and the second hollow area 201, and the second pure water / alkaline liquid flow opening 202 and the second hollow area 201 are connected through the plurality of second flow channels 203.

[0056] The multiple second flow channels 203 include multiple second intermediate serrated flow channels 204 and multiple second lateral serrated flow channels 205 symmetrically arranged on both sides of the multiple second intermediate serrated flow channels 204. The multiple second intermediate serrated flow channels 204 are parallel to each other, and the multiple second lateral serrated flow channels 205 are inclined away from the second intermediate serrated flow channels 204, so that the electrolyte can be quickly and evenly introduced into the second hollow area 201.

[0057] Second embedded grooves 206 are provided along the front and back sides of the cathode frame 20 . The second embedded grooves 206 are located in a circle outside the plurality of second pure water / alkaline solution flow channel openings 202 . A sealing strip is embedded in the second embedded grooves 206 .

[0058] Furthermore, a plurality of second dot-shaped protrusions 207 are evenly arranged on the end surface of the back side of the cathode frame 20 close to the second hollow area 201 . The second dot-shaped protrusions 207 have the same function as the first dot-shaped protrusions 107 , which will not be described in detail here.

[0059] In addition, the cathode frame 20 is made of engineering plastics and is integrally injection molded. The anode frame and cathode frame of an electrolytic cell of the present application are suitable for PEM and AEM electrolytic cells.

[0060] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrolytic cell anode frame, the anode frame (10) having a front side (101) and a back side (102), the contact surface of the anode frame (10) with the electrode plate being the front side (101), and the contact surface of the anode frame (10) with the membrane electrode being the back side (102), characterized in that: The middle part of the anode frame (10) is a first hollow area (103), the first hollow area (103) penetrates the anode frame (10) along the thickness direction of the anode frame (10), at least two first pure water / alkaline solution flow channel openings (104) are provided on the left and right sides of the anode frame (10) along its length direction, a plurality of first flow channels (105) are provided between each of the first pure water / alkaline solution flow channel openings (104) and the first hollow area (103), and the first pure water / alkaline solution flow channel openings (104) and the first hollow area (103) are connected via the plurality of first flow channels (105); The plurality of first flow channels (105) comprise a plurality of first intermediate toothed flow channels (1051) and a plurality of first lateral toothed flow channels (1052) symmetrically arranged on both sides of the plurality of first intermediate toothed flow channels (1051), the plurality of first intermediate toothed flow channels (1051) are all parallel to each other, and the plurality of first lateral toothed flow channels (1052) are all inclined in a direction away from the first intermediate toothed flow channels (1051); A first embedded groove (106) is provided along the front side (101) and the back side (102) of the anode frame (10); the first embedded groove (106) is located in a circle outside the plurality of first pure water / alkali solution flow channel openings (104); and a sealing strip is embedded in the first embedded groove (106).

2. The electrolytic cell anode frame according to claim 1, characterized in that: A plurality of first dot-shaped protrusions (107) are evenly arranged on the end surface of the back side (102) of the anode frame (10) close to the first hollow area (103).

3. The electrolytic cell anode frame according to claim 1, characterized in that: The anode frame (10) is integrally injection-molded using engineering plastics.

4. The electrolytic cell anode frame according to claim 1, characterized in that: The anode frame (10) has a rectangular shape and is suitable for a PEM electrolyzer or an AEM electrolyzer.

5. The electrolytic cell anode frame according to claim 4, characterized in that: The first pure water / alkaline solution flow channel (104) has a rectangular shape.

6. A cathode frame of an electrolytic cell, characterized in that: The middle part of the cathode frame (20) is a second hollow area (201), the second hollow area (201) penetrates the cathode frame (20) along the thickness direction of the cathode frame (20), at least two second pure water / alkaline solution flow channel openings (202) are provided on the upper and lower sides of the cathode frame (20) along its width direction, a plurality of second flow channels (203) are provided between each of the second pure water / alkaline solution flow channel openings (202) and the second hollow area (201), and the second pure water / alkaline solution flow channel openings (202) and the second hollow area (201) are connected via the plurality of second flow channels (203); The plurality of second flow channels (203) comprise a plurality of second intermediate toothed flow channels (204) and a plurality of second lateral toothed flow channels (205) symmetrically arranged on both sides of the plurality of second intermediate toothed flow channels (204), the plurality of second intermediate toothed flow channels (204) are all parallel to each other, and the plurality of second lateral toothed flow channels (205) are all inclined in a direction away from the second intermediate toothed flow channels (204); A second embedded groove (206) is provided along the front and back sides of the cathode frame (20), the second embedded groove (206) is located in a circle outside the plurality of second pure water / alkaline solution flow channel openings (202), and a sealing strip is embedded in the second embedded groove (206).

7. The cathode frame of the electrolytic cell according to claim 6, characterized in that: A plurality of second dot-shaped protrusions (207) are evenly arranged on the end surface of the back side of the cathode frame (20) close to the second hollow area (201).

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