An intermediate electrode assembly and an electrolytic cell

Abstract

This invention discloses an intermediate electrode plate assembly and an electrolytic cell. The intermediate electrode plate assembly includes a first electrode plate assembly and a second electrode plate assembly. The first electrode plate assembly includes a first electrode frame and a first electrode plate fixed to one side edge of the first electrode frame. The second electrode plate assembly includes a second electrode frame and a second electrode plate. A sealing gasket for sealing is provided between the other side of the first electrode frame and the second electrode frame. The first electrode frame, the first electrode plate, the second electrode frame, and the second electrode plate together form an electrolyte cavity. The intermediate electrode plate assembly provided by this invention does not have a welded, non-removable enclosed space, thus allowing the first and second electrode plate assemblies to be nickel-plated separately without the need for welding during assembly, preserving the plating and improving corrosion resistance.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production by electrolysis, specifically to an intermediate electrode assembly and an electrolytic cell. Background Technology

[0002] Hydrogen is an extremely clean and efficient renewable energy source. Under the overarching goal of reducing carbon emissions and achieving carbon neutrality, water electrolysis for hydrogen production has been widely demonstrated and applied in various fields. The electrolyzer is the core equipment for water electrolysis hydrogen production, with wide applications and a significant impact on the performance, lifespan, and cost of the system. The intermediate electrode plate is a core component of the electrolyzer, significantly affecting its cost and performance. For electrolyzers with intermediate electrodes, existing intermediate electrodes have a completely closed structure, resulting in poor corrosion resistance due to the enclosed internal space. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes an intermediate electrode assembly that eliminates the need for welded, non-removable enclosed spaces. This allows the first and second electrode assemblies to be nickel-plated separately, eliminating the need for welding during assembly, thus preserving the plating and improving corrosion resistance.

[0004] The technical solution of this utility model is implemented as follows:

[0005] An intermediate electrode assembly includes a first electrode assembly and a second electrode assembly. The first electrode assembly includes a first electrode frame and a first electrode plate fixed to one side edge of the first electrode frame. The second electrode assembly includes a second electrode frame and a second electrode plate. A sealing gasket for sealing is provided between the other side of the first electrode frame and the second electrode frame. The first electrode frame, the first electrode plate, the second electrode frame, and the second electrode plate together form an electrolyte cavity.

[0006] Preferably, a support assembly is detachably provided inside the electrolyte cavity.

[0007] Preferably, the support assembly includes a first cover plate, a second cover plate, and support ribs supporting the first cover plate and the second cover plate.

[0008] Preferably, the support plate ribs divide the cavity formed between the first cover plate and the second cover plate into multiple distribution cavities.

[0009] Preferably, a hydrogen collection channel and an oxygen collection channel are provided on the upper part of the second electrode frame, wherein the hydrogen collection channel is connected to the cathode chamber and the oxygen collection channel is connected to the anode chamber.

[0010] Preferably, a first electrolyte inlet communicating with an external electrolyte pipeline is provided on the outer periphery of the first electrode frame, and a plurality of second electrolyte inlets communicating with the first electrolyte inlet are provided on the second electrode frame;

[0011] Multiple first electrolyte distribution channels are provided on the second electrode frame, and the first electrolyte distribution channels are connected to the electrolysis chamber.

[0012] Preferably, a first cathode gas outlet connected to an external cathode gas channel and a first anode gas outlet connected to an external anode gas channel are provided on the outer periphery of the upper part of the first electrode frame. The hydrogen gas collecting channel is connected to the first cathode gas outlet, and the oxygen gas collecting channel is connected to the first anode gas outlet.

[0013] Preferably, a fourth electrolyte inlet is provided on the inner edge of the lower part of the first electrode frame, and a second cathode gas outlet and a second anode gas outlet are provided on the inner edge of the upper part of the first electrode frame. The second cathode gas outlet is connected to a hydrogen collection channel, and the second cathode gas outlet is connected to an oxygen collection channel.

[0014] Preferably, a third electrolyte inlet communicating with the electrolyte cavity is also provided on the second electrode plate, and an exhaust port is also provided on the second electrode plate.

[0015] This utility model also provides an electrolytic cell, including the above-mentioned intermediate electrode assembly.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Compared with existing intermediate plates, this utility model assembles a first plate assembly and a second plate assembly to form a split intermediate plate structure. There is no closed space that cannot be disassembled after welding. Therefore, the first plate assembly and the second plate assembly can be nickel-plated separately before assembly. No welding is required during assembly, the plating is not damaged, and the corrosion resistance is improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the intermediate electrode plate assembly of Example 1;

[0020] Figure 2 This is an exploded view of the intermediate electrode plate assembly of Example 2.

[0021] Reference numerals in the attached diagram: 1. First electrode assembly; 11. First electrode frame; 111. External channel for cathode gas; 112. External channel for anode gas; 113. Second cathode gas outlet; 114. Second anode gas outlet; 12. First electrode plate; 13. First electrolyte inlet; 14. Fourth electrolyte inlet;

[0022] 2. Second electrode plate assembly; 21. Second electrode frame; 211. Hydrogen collection channel; 212. Oxygen collection channel; 22. Second electrode plate; 23. Second electrolyte inlet; 24. Third electrolyte inlet; 25. First electrolyte distribution channel; 26. Exhaust port; 27. Fifth electrolyte inlet; 28. Second electrolyte distribution channel;

[0023] 3. Sealing gasket;

[0024] 4. Electrolyte cavity;

[0025] 5. Supporting components; 51. First cover plate; 52. Second cover plate; 53. Supporting ribs;

[0026] 6. External electrolyte pipeline. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1

[0031] See Figure 1 This embodiment provides an intermediate electrode assembly, including a first electrode assembly 1 and a second electrode assembly 2. The first electrode assembly 1 includes a first electrode frame 11 and a first electrode plate 12 fixed to one side edge of the first electrode frame 11. The second electrode assembly 2 includes a second electrode frame 21 and a second electrode plate 22. A sealing gasket 3 for sealing is provided between the other side of the first electrode frame 11 and the second electrode frame 21. After the first electrode assembly 1 and the second electrode assembly 2 are assembled, the first electrode frame 11, the first electrode plate 12, the second electrode frame 21, and the second electrode plate 22 together form an electrolyte cavity 4.

[0032] It should be noted that the first electrode frame 11 and the second electrode frame 21 will have openings according to the needs of electrolyte flow, and the opening positions on the sealing gasket 3 correspond to the opening positions of the first electrode frame 11.

[0033] Compared with existing intermediate plates, this utility model assembles a first plate assembly 1 and a second plate assembly 2 to form a split intermediate plate structure. There is no closed space that cannot be disassembled after welding. Therefore, the first plate assembly 1 and the second plate assembly 2 can be nickel-plated separately before assembly. No welding is required during assembly, the plating is not damaged, and the corrosion resistance is improved.

[0034] Furthermore, a support component 5 is detachably installed inside the electrolyte cavity 4, so that the support component 5 can be manufactured separately and installed into the electrolyte cavity 4, which can support the first electrode plate 12 and the second electrode plate 22 respectively, reduce the deformation of internal components such as the electrolytic cell electrode plates and electrodes, improve the consistency of electrode spacing, and improve the reliability and service life of the equipment.

[0035] Furthermore, the support assembly 5 includes a first cover plate 51, a second cover plate 52, and a support rib 53 supporting the first cover plate 51 and the second cover plate 52. By setting the first cover plate 51 and the second cover plate 52, the electrode plates are subjected to more uniform force and the electrode plate deformation is smaller during the assembly of the electrolytic cell.

[0036] Furthermore, the support plate rib 53 divides the cavity formed between the first cover plate 51 and the second cover plate 52 into multiple distribution cavities.

[0037] Furthermore, a first electrolyte inlet 13 communicating with an external electrolyte pipe 6 is provided on the lower outer periphery of the first electrode frame 11, and a plurality of second electrolyte inlets 23 communicating with the first electrolyte inlet 13 are provided on the second electrode frame 21, so that the electrolyte enters the first electrolyte inlet 13 from the external electrolyte pipe 6 and then enters the second electrolyte inlet 23. A third electrolyte inlet 24 communicating with the electrolyte cavity 4 is also provided on the second electrode plate 21, so that the electrolyte can enter the electrolyte cavity 4 from the third electrolyte inlet 24. A plurality of first electrolyte distribution channels 25 are provided on the second electrode frame 22, wherein the second electrolyte inlets 23 and the first electrolyte distribution channels 25 are interspersed, and the first electrolyte distribution channels 25 are communicating with the electrolysis chamber, so that the electrolyte enters the electrolysis chamber through this channel.

[0038] Furthermore, an exhaust port 26 is provided on the second electrode plate 22 to discharge the gas in the electrolyte cavity 4. The presence of the exhaust port 26 can promptly discharge the gas in the closed cavity, so that the cavity is filled with electrolyte, maintain conductivity, and ensure the safe use of the equipment.

[0039] Furthermore, a hydrogen collection channel 211 and an oxygen collection channel 212 are provided on the upper part of the second electrode frame 21. The hydrogen collection channel 211 is connected to the cathode chamber, and the oxygen collection channel 212 is connected to the anode chamber. A first cathode gas outlet (not shown in the figure) connected to the cathode gas external channel 111 and a first anode gas outlet (not shown in the figure) connected to the anode gas external channel 112 are provided on the outer periphery of the upper part of the first electrode frame 11. The hydrogen collection channel 211 is connected to the first cathode gas outlet, and the oxygen collection channel 212 is connected to the first anode gas outlet. Thus, the hydrogen and oxygen generated by electrolysis enter the corresponding external channels from the corresponding outlets and are then collected separately.

[0040] It should be noted that in this embodiment, the hydrogen gathering channel 211 is located on the left and the oxygen gathering channel 212 is located on the right. Of course, the left and right positions of the hydrogen gathering channel 211 and the oxygen gathering channel 212 can also be interchanged, as long as the components connected to the hydrogen gathering channel 211 and the oxygen gathering channel 212 are adjusted accordingly.

[0041] Example 2

[0042] like Figure 2 As shown, unlike Embodiment 1, in this embodiment, a fourth electrolyte inlet 14 is provided at the lower inner edge of the first electrode frame 11, and a second cathode gas outlet 113 and a second anode gas outlet 114 are provided at the upper inner edge of the first electrode frame 11. The second cathode gas outlet 113 is connected to the hydrogen collection channel 211, and the second anode gas outlet 114 is connected to the oxygen collection channel 212.

[0043] Furthermore, multiple fifth electrolyte inlets 27, which are connected to the fourth electrolyte inlet 14, are provided on the second electrode frame 21. The electrolyte flows from the outside to the fourth electrolyte inlet 14, then into the fifth electrolyte inlet 27. After reaching the end plate of the electrolytic cell, it passes through multiple continuously distributed second electrolyte distribution channels 28 on one side of the second electrode frame 21. These second electrolyte distribution channels 28 are connected to the electrolysis chamber, allowing the electrolyte to enter the electrolysis chamber for electrolysis. Part of the electrolyte enters the electrolyte cavity 4 from the third electrolyte inlet 24. Similarly, multiple continuously distributed second electrolyte distribution channels 28 are provided on the other side of the second electrode frame 21, allowing the electrolyte to also enter the electrolysis chamber for electrolysis. The fifth electrolyte inlets 27 are located outside the second electrolyte distribution channels 28.

[0044] Example 3

[0045] This embodiment also provides an electrolytic cell, including the intermediate electrode assembly in Embodiment 1. The intermediate electrode assembly in Embodiment 1 can be assembled into an electrolytic cell with one positive and one negative electrode and the middle electrode inlet.

[0046] Example 4

[0047] This embodiment provides an electrolytic cell, including the intermediate electrode assembly of Embodiment 2. The intermediate electrode assembly of Embodiment 2 is assembled into an electrolytic cell with one positive and two negative terminals into which liquid enters.

[0048] The electrolytic cells assembled in Examples 3 and 4 exhibit uniform internal stress, less electrode plate deformation, better chamber consistency, higher electrolysis efficiency, and longer service life.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An intermediate electrode plate assembly, characterized in that, The device includes a first electrode assembly (1) and a second electrode assembly (2). The first electrode assembly (1) includes a first electrode frame (11) and a first electrode plate (12) fixed on one side edge of the first electrode frame (11). The second electrode assembly (2) includes a second electrode frame (21) and a second electrode plate (22). A sealing gasket (3) for sealing is provided between the other side of the first electrode frame (11) and the second electrode frame (21). The first electrode frame (11), the first electrode plate (12), the second electrode frame (21), and the second electrode plate (22) together form an electrolyte cavity (4).

2. The intermediate electrode assembly according to claim 1, characterized in that, A support assembly (5) is detachably installed inside the electrolyte cavity (4).

3. The intermediate electrode assembly according to claim 2, characterized in that, The support assembly (5) includes a first cover plate (51), a second cover plate (52), and a support rib (53) supporting the first cover plate (51) and the second cover plate (52).

4. The intermediate electrode assembly according to claim 3, characterized in that, The supporting plate rib (53) divides the cavity formed between the first cover plate (51) and the second cover plate (52) into multiple distribution cavities.

5. The intermediate electrode assembly according to claim 1, characterized in that, A hydrogen collection channel (211) and an oxygen collection channel (212) are provided on the upper part of the second pole frame (21). The hydrogen collection channel (211) is connected to the cathode chamber, and the oxygen collection channel (212) is connected to the anode chamber.

6. The intermediate electrode assembly according to claim 5, characterized in that, A first electrolyte inlet (13) communicating with an external electrolyte pipe (6) is provided on the outer periphery of the first electrode frame (11), and a plurality of second electrolyte inlets (23) communicating with the first electrolyte inlet (13) are provided on the second electrode frame (21). Multiple first electrolyte distribution channels (25) are provided on the second pole frame (21), and the first electrolyte distribution channels (25) are connected to the electrolysis chamber.

7. The intermediate electrode assembly according to claim 6, characterized in that, A first cathode gas outlet connected to the cathode gas external channel (111) and a first anode gas outlet connected to the anode gas external channel (112) are provided on the outer periphery of the upper part of the first electrode frame (11). The hydrogen gas collection channel (211) is connected to the first cathode gas outlet, and the oxygen gas collection channel (212) is connected to the first anode gas outlet.

8. The intermediate electrode assembly according to claim 5, characterized in that, A fourth electrolyte inlet (14) is provided on the inner edge of the lower part of the first electrode frame (11), and a second cathode gas outlet (113) and a second anode gas outlet (114) are provided on the inner edge of the upper part of the first electrode frame (11). The second cathode gas outlet (113) is connected to the hydrogen collection channel (211), and the second anode gas outlet (114) is connected to the oxygen collection channel (212).

9. The intermediate electrode plate assembly according to claim 1, characterized in that, A third electrolyte inlet (24) communicating with the electrolyte cavity (4) is also provided on the second electrode plate (22), and an exhaust port (26) is also provided on the second electrode plate (22).

10. An electrolytic cell, characterized in that, Includes the intermediate electrode assembly as described in any one of claims 1-9.

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