Electrode plate assembly and electrolysis device

Abstract

An electrode plate assembly and an electrolysis device. The electrode plate assembly (100) comprises an annular electrode frame (110) and a main electrode plate (120) mounted on the inner side of the annular electrode frame (110). The annular electrode frame (110) has two first end faces parallel to each other. The main electrode plate (120) has two second end faces parallel to the first end faces. There is a distance L between either one of the first end faces and the second end face adjacent thereto, the thickness between the two second end faces of the main electrode plate (120) is d, and the thickness d and the distance L at least meet one of the following conditions: 0.75 ≤ L / d ≤ 9, -0.5 mm ≤ L-d ≤ 4 mm, or 2 mm ≤ L + d ≤ 6.5 mm. The electrode plate assembly and the electrolysis device can achieve a light weight and can also provide enough support for anodes and cathodes, beneficially ensuring the stability and safety of an electrolysis process.

Description

Electrolytic device and bipolar plate assembly

[0001] Cross-reference to Related Applications

[0002] This application claims priority to and the benefit of Chinese Patent Application No. 202420762027.3, filed on April 15, 2024, entitled “Electrolytic device and bipolar plate assembly,” the contents of which are incorporated herein in their entirety by this reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of electrolysis, in particular to an electrolytic device and a bipolar plate assembly. BACKGROUND

[0004] Hydrogen energy, as a clean, efficient, and renewable secondary energy, has attracted widespread attention for its development and utilization. Water electrolysis technology, especially alkaline water electrolysis technology, has become one of the mainstream technical routes for large-scale hydrogen production due to its mature technology, relatively low cost, and ease of scaling. Alkaline water electrolysis equipment, as the core device of this technology, directly affects the hydrogen production efficiency, energy consumption, and cost. The electrolysis equipment is mainly composed of multiple bipolar plates, end frames, end pressure plates, and other core components. The multiple bipolar plates form a plurality of single electrolysis cells with a plurality of anodes and cathodes, and the multiple electrolysis cells are connected in series and fixed by the end frame, end pressure plate, and other components to form the main part of the electrolysis equipment.

[0005] With the development of water electrolysis technology and the scaling demand for hydrogen in the industry, electrolytic hydrogen production equipment has gradually developed towards large-scale, and lightweight of electrolytic hydrogen production equipment has become an urgent problem to be solved in the industry. SUMMARY

[0006] The present application provides an electrolytic device and a bipolar plate assembly to solve the technical problems of existing large-scale electrolysis equipment that is difficult to meet the lightweight requirements, and lacks stability and safety.

[0007] According to one aspect of the present application, a bipolar plate assembly is provided, which includes an annular end frame and a main bipolar plate installed on the inner side of the annular end frame. The annular end frame has two first end faces parallel to each other, and the main bipolar plate has two second end faces parallel to the first end faces. There is a spacing L between any first end face and its adjacent second end face. The thickness between the two second end faces of the main bipolar plate is d. The thickness d and the spacing L at least satisfy one of the following conditions: 0.75≤L / d≤9, -0.5mm≤L-d≤4mm, or 2mm≤L+d≤6.5mm.

[0008] According to the polar plate assembly provided in the present application, by controlling the thickness d and the spacing L of the main polar plate to be in the above size relationship, the thickness d and the spacing L of the main polar plate can be taken as the smallest possible value, so as to facilitate the lightweight design of the polar plate. Moreover, since the thickness d and the spacing L of the main polar plate are both within a suitable range, the size of the polar plate assembly formed by the main polar plate and the annular polar frame is also within a suitable range, so as to provide sufficient support for the anode and the cathode, thereby facilitating the stability and safety of the electrolysis process, and meanwhile, the size of the electrolysis cell formed by the polar plate and the anode, the cathode and other components is also within a suitable range, so as to facilitate the reduction of the current transmission resistance and the improvement of the electrolysis efficiency.

[0009] In order to further improve the performance of the polar plate assembly, the thickness d and the spacing L between the two second end surfaces of the main polar plate can also be further optimized. For example, in some optional schemes, the thickness d and the spacing L satisfy: L > d, and 1 < L / d ≤ 9 or 0 < L-d ≤ 4 mm; in other optional schemes, the thickness d and the spacing L satisfy: L ≤ d, and 1 mm ≤ L+d ≤ 4 mm. For another example, in some optional schemes, the thickness d and the spacing L at least satisfy one of the following conditions: 2.25 ≤ L / d ≤ 4.5, 1.75 mm ≤ L-d ≤ 3.25 mm or 3.25 mm ≤ L+d ≤ 5.75 mm. For another example, in other optional schemes, the thickness d and the spacing L at least satisfy one of the following conditions: 2.85 ≤ L / d ≤ 4.5, 1.75 mm ≤ L-d ≤ 2.25 mm, 2.75 mm ≤ L-d ≤ 3.25 mm or 3.25 mm ≤ L+d ≤ 5.25 mm. For another example, in some optional schemes, the spacing L satisfies: 1.5 mm ≤ L ≤ 4.5 mm; and / or the thickness d satisfies: 0.5 mm ≤ d ≤ 1.5 mm; and / or the thickness h between the two first end surfaces of the annular polar frame satisfies: 5 mm ≤ h ≤ 11 mm.

[0010] By further optimizing the relationship between the thickness d and the spacing L of the main polar plate, the size range of the polar plate assembly is within a more suitable range, which is more conducive to the lightweight design of the polar plate assembly and improves the stability and safety of the electrolysis process. In addition to the thickness d and the spacing L of the main polar plate, the thickness h of the annular polar frame also affects the performance of the polar plate assembly. Controlling the thickness h of the annular polar frame within a more suitable range can also make the overall polar plate assembly have the advantage of lightweight design, which can reduce the amount of raw materials such as carbon steel required by the polar plate assembly and effectively reduce the cost. Since the polar plate assembly needs to be assembled with components such as anodes and cathodes, the structure of the polar plate assembly itself can also be improved to facilitate the adaptation with the components such as anodes and cathodes.

[0011] In a further preferred embodiment, the annular pole frame comprises a main body and a tongue plate protruding inwardly from the main body, the main pole plate is mounted at the end edge of the tongue plate, and the two first end faces are located on the main body.

[0012] According to the pole plate assembly provided in the present application, since the main pole plate is connected to the main body through the tongue plate, the distance between the main body and the main pole plate is increased, so that the installation tool will not be interfered by the inner circumferential surface of the main body during the installation of the main pole plate, and more operation space is provided during the installation, facilitating the connection and installation of the main body and the main pole plate. Moreover, when the main pole plate is connected to the tongue plate by welding, the thermal deformation of the main pole plate and the main body due to welding can also be avoided.

[0013] In a further preferred embodiment, the tongue plate has two third end faces parallel to the first end faces and the second end faces, and the thickness between the two third end faces is greater than or equal to the thickness d between the two second end faces. In this way, the connection reliability between the tongue plate and the main pole plate can be ensured.

[0014] In a further preferred embodiment, the main pole plate comprises a base plate and a plurality of papillae protruding from the surface of the base plate, and the second end face is located on the base plate. In this embodiment, the distance f between the highest position of the papillae protruding from the surface of the base plate and the surface of the base plate satisfies 1.7mm≤f≤4.7mm, and / or the protruding directions of adjacent two papillae relative to the base plate are opposite.

[0015] According to another aspect of the present application, an electrolytic device is provided, which comprises at least two pole plate assemblies as described above, and the at least two pole plate assemblies are arranged side by side. In this embodiment, the annular pole frames of adjacent two pole plate assemblies are arranged in abutment, or a sealing member is arranged between the annular pole frames of adjacent two pole plate assemblies, and the total thickness of the sealing member and the annular pole frame adjacent thereto is H, and 2L+d<H≤2L+d+3.3.

[0016] According to still another aspect of the present application, an electrolytic device is provided, which comprises the pole plate assembly as described above, and further comprises an anode, a cathode, and a diaphragm, the anode and the cathode are respectively arranged on the two sides of the main pole plate along the thickness direction thereof, and the diaphragm is arranged on the side of the cathode or the anode away from the main pole plate. Since the pole plate assembly as described above is used, the size of the electrolytic cell is also optimized, which is beneficial to reduce the transmission resistance, reduce the voltage of the electrolytic cell, and thus reduce the power consumption.

[0017] In order to improve the supporting effect of the main electrode plate on the anode and the cathode, the structure of the main electrode plate or the supporting member can also be optimized. In a further preferred embodiment, the main electrode plate has a flat plate structure, the electrolytic device further comprises a supporting member, the supporting member is arranged between the anode and the main electrode plate and between the cathode and the main electrode plate, and the size of the supporting member in the thickness direction of the main electrode plate is not less than the interval L; and / or the main electrode plate comprises a substrate and a papilla protruding from the surface of the substrate, and the distance f between the highest position of the papilla protruding from the surface of the substrate and the surface of the substrate is not less than the interval L. Thus, the anode and the cathode can be effectively supported by the supporting member or the papilla on the main electrode plate, so as to improve the structural stability of the electrolytic device.

[0018] In a further preferred embodiment, the size of the supporting member in the thickness direction of the main electrode plate is 1.7-4.7 mm; and / or the distance f between the highest position of the papilla protruding from the surface of the substrate and the surface of the substrate is 1.7-4.7 mm. By controlling the size of the supporting member or the papilla within the above suitable range, the supporting effect of the supporting member or the papilla on the anode and the cathode can be further improved, and the lightweight design of the electrolytic device is facilitated.

[0019] In summary, the main electrode plate and the electrolytic device provided by the present application have at least the following beneficial effects:

[0020] In the present application, by controlling the relationship between the thickness d of the main electrode plate and the interval L, the structure of the electrode plate assembly is optimized, so that the thickness d of the main electrode plate and the interval L are as small as possible, which reduces the thickness of the annular electrode frame and the main electrode plate, thereby reducing the size of the entire electrode plate assembly in the thickness direction, so as to reduce the volume and weight of the entire electrode plate assembly. Thus, when a plurality of electrode plate assemblies are arranged in a stacked manner in the thickness direction to form an electrolytic device, the electrolytic device can be lightweight, thereby reducing the space occupation, reducing the cost of raw materials, and reducing the cost of processing and transportation. Moreover, since the size of the thickness d of the main electrode plate and the interval L is within a suitable range, the size of the electrode plate assembly connected by the main electrode plate and the annular electrode frame is within a suitable range, so that when the electrode plate is assembled with the anode, the cathode and other components to form an electrolytic device, the electrode plate can provide sufficient support for the anode and the cathode, so as to ensure the stability and safety of the electrolytic process. At the same time, the size of the electrolytic cell formed by the electrode plate, the anode and the cathode and other components is within a suitable range, so as to reduce the current transmission resistance in the electrolytic process and improve the electrolytic efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor based on these drawings.

[0022] Fig. 1 is a structural schematic diagram of an electrolytic device provided by an embodiment of the present application;

[0023] Fig. 2 is a structural schematic diagram of a polar plate assembly provided by an embodiment of the present application, wherein a plurality of polar plate assemblies are not assembled;

[0024] Fig. 3 is a structural schematic diagram of a polar plate assembly provided by another embodiment of the present application, wherein a plurality of polar plate assemblies are not assembled;

[0025] Fig. 4 and Fig. 5 are respectively a partial structural schematic diagram of an electrolytic device provided by an embodiment of the present application, wherein the polar plate is in a circular ring structure, and the A-A plane cross-sectional structure in Fig. 4 is shown in Fig. 1;

[0026] Fig. 6 is a structural schematic diagram of an electrolytic device provided by another embodiment of the present application, wherein a plurality of polar plate assemblies are assembled.

[0027] The reference signs are as follows: 100, polar plate assembly; 110, annular polar frame; 120, main polar plate; 121, papilla; 122, base plate; 111, main body; 111a, first section; 111b, second section; 111c, stepped structure; 112, tongue plate; 113, feeding port; 114, discharging port; A, first end face; B, second end face; C, third end face; 200, anode; 300, cathode; 400, diaphragm; 500, support; 600, sealing member. DETAILED DESCRIPTION

[0028] In the description of the present application, it should be understood that the description of the orientation or positional relationship such as the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, if no special description is given, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, where a limitation of "first", "second", etc. is used in the description, such limitation is used for descriptive purposes only and is not to be construed as indicating or implying that a relative importance or an indicated number of features is implied. A limitation of "first", "second", etc. can explicitly or implicitly include at least one of the features limited. Where the description of "a plurality" appears, the general meaning is at least two, such as two, three, etc., unless there is a clear and specific limitation.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms such as "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the description of the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0032] Fig. 1 is a structural schematic diagram of an electrolytic device provided by an embodiment of the present application; Fig. 2 is a structural schematic diagram of a polar plate assembly provided by an embodiment of the present application, wherein a plurality of polar plate assemblies are not assembled; Fig. 3 is a structural schematic diagram of a polar plate assembly provided by another embodiment of the present application, wherein a plurality of polar plate assemblies are not assembled.

[0033] Please refer to Figs. 1 to 3, the polar plate assembly 100 provided by an embodiment of the present application at least includes a polar frame 110 and a main polar plate 120.

[0034] The polar frame 110 includes a main body 111 and a tongue plate 112, the tongue plate 112 is arranged and protrudes from the main body 111 along a first direction X, and the end face of the tongue plate 112 in a second direction Y is spaced apart from the end face of the polar frame 110 in the second direction Y, wherein the first direction is orthogonal to the second direction, and the second direction is parallel to the thickness direction of the tongue plate 112.

[0035] The main plate 120 is arranged along the first direction and connected to the side of the tongue plate 112 away from the main body 111, for example, the main plate 120 can be welded, inserted, etc. with the tongue plate 112. The thickness d of the main plate 120 and the distance L between the end surface of the tongue plate 112 in the second direction and the end surface of the pole frame 110 in the second direction at least satisfy one of the following conditions: 0.75≤L / d≤9, -0.5mm≤L-d≤4mm or 2mm≤L+d≤6.5mm. Wherein, the thickness d of the main plate 120 refers to the size of the main plate 120 in the second direction.

[0036] Another embodiment of the application provides a pole plate assembly 100, which at least includes a ring-shaped pole frame 110 and a main plate 120 mounted on the inner side of the ring-shaped pole frame 110. Specifically, the ring-shaped pole frame 110 is generally a hollow ring structure, such as a circular, rectangular or any other shape of hollow ring structure.

[0037] The main plate 120 is arranged in the hollow interior of the ring-shaped pole frame 110 and connected to the inner wall of the ring-shaped pole frame 110. Accordingly, the main plate 120 is generally a solid plate structure matched with the ring-shaped pole frame 110, such as a circular, rectangular or any other shape of solid plate structure.

[0038] The ring-shaped pole frame 110 has two first end surfaces A parallel to each other, and the main plate 120 has two second end surfaces B parallel to the first end surfaces A.

[0039] Wherein, the distance L between any first end surface A of the ring-shaped pole frame 110 and its adjacent second end surface B, and the thickness d of the main plate 120 is the distance between the two second end surfaces B, and the thickness d and the distance L at least satisfy one of the following conditions: 0.75≤L / d≤9, -0.5mm≤L-d≤4mm or 2mm≤L+d≤6.5mm.

[0040] Wherein, the thickness d of the main plate 120 refers to the size of the main plate 120 in the second direction Y, i.e. the distance between the two opposite second end surfaces B of the main plate 120, and the distance L refers to the distance between any first end surface A of the pole frame 110 and the second end surface B on the same side of the first end surface A of the main plate 120 adjacent to it.

[0041] Exemplarily, in any of the above embodiments, the thickness d of the main polar plate 120 and the interval L can satisfy 0.75≤L / d≤9, for example, L / d can be 0.75, 1, 2, 3, 4, 5, 6, 7, 8, 9, etc.; or the thickness d of the main polar plate 120 and the interval L can satisfy -0.5mm≤L-d≤4mm, for example, L-d can be -0.5mm, -0.25mm, 0mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.; or the thickness d of the main polar plate 120 and the interval L can satisfy 2mm≤L+d≤6.5mm, for example, L+d can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, etc.; or the thickness d of the main polar plate 120 and the interval L can satisfy -0.5mm≤L-d≤4mm and 2mm≤L+d≤6.5mm at the same time.

[0042] The polar plate assembly is used to support the anode and the cathode and usually includes a polar frame and a main polar plate. In view of the raw material cost and the processing and transportation cost, the electrolytic device tends to be designed to be lighter and lighter. At present, the common electrolytic device is to reduce the size of the polar plate by thinning the thickness of the main polar plate, so as to reduce the overall weight of the electrolytic device. However, only thinning the thickness of the main polar plate will result in insufficient support of the polar plate to the anode and the anode, which affects the stability and safety of the electrolytic device.

[0043] In the present application, through the above structural design of the polar plate assembly 100, when the thickness d of the main polar plate 120 and the interval L are controlled to be within the above size relationship, the thickness d of the main polar plate 120 and the interval L can take the smallest possible value, which reduces the thickness of the annular polar frame 110 and the main polar plate 120, so as to make the size of the entire polar plate assembly 100 in the second direction as small as possible, thereby facilitating the reduction of the volume and weight of the entire polar plate assembly 100. Thus, when a plurality of polar plate assemblies 100 are arranged in a stacked manner along the second direction to form an electrolytic device, the electrolytic device can be lightened, thereby facilitating the reduction of space occupation and the reduction of raw material cost, and also reducing the processing and transportation cost.

[0044] Moreover, since the thickness d of the main polar plate 120 and the interval L are within the appropriate range, the size of the polar plate assembly 100 formed by the main polar plate 120 and the annular polar frame 110 is within the appropriate range, so that when the polar plate assembly 100 is assembled with components such as the anode 200 and the cathode 300 to form an electrolytic device, the polar plate assembly 100 can provide sufficient support for the anode 200 and the cathode 300, thereby facilitating the stability and safety of the electrolytic process. At the same time, the size of the electrolytic cell formed by the polar plate assembly 100 and components such as the anode 200 and the cathode 300 can also be within the appropriate range, thereby facilitating the reduction of the current transmission resistance in the electrolytic process and improving the electrolytic efficiency.

[0045] As a further preferred embodiment, on the basis of any of the above embodiments, one or more of the following additions or combinations can also be included in the specific embodiments of the present application.

[0046] In some optional embodiments, the thickness d of the main polar plate 120 and the pitch L at least satisfy one of the following conditions: when L > d, 1 < L / d ≤ 9 or 0 < L-d ≤ 4 mm; when L ≤ d, 1 mm ≤ L+d ≤ 4 mm. In the case of the present embodiment, it is beneficial to further realize the lightweight of the polar plate assembly 100, while further ensuring the stability and safety of the electrolysis process.

[0047] Illustratively, when L > d, the thickness d of the main polar plate 120 and the pitch L can satisfy 1 < L / d ≤ 9; or the thickness d of the main polar plate 120 and the pitch L can satisfy 0 < L-d ≤ 4 mm; or the thickness d of the main polar plate 120 and the pitch L can simultaneously satisfy 1 < L / d ≤ 9 and 0 < L-d ≤ 4 mm; when L ≤ d, the thickness d of the main polar plate 120 and the pitch L can satisfy 1 mm ≤ L+d ≤ 4 mm.

[0048] In some optional embodiments, the thickness d of the main polar plate 120 and the pitch L at least satisfy one of the following conditions: 2.25 ≤ L / d ≤ 4.5, 1.75 mm ≤ L-d ≤ 3.25 mm or 3.25 mm ≤ L+d ≤ 5.75 mm.

[0049] Illustratively, the thickness d of the main polar plate 120 and the pitch L can satisfy 2.25 ≤ L / d ≤ 4.5, for example, L / d can be 2.25, 2.5, 3, 3.25, 3.75, 4, 4.25, 4.5, etc.; or the thickness d of the main polar plate 120 and the pitch L can satisfy 1.75 mm ≤ L-d ≤ 3.25 mm, for example, L-d can be 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.25 mm, etc.; or the thickness d of the main polar plate 120 and the pitch L can satisfy 3.25 mm ≤ L+d ≤ 5.75 mm, for example, L+d can be 3.25 mm, 3.5 mm, 3.75 mm, 4 mm, 4.25 mm, 4.75 mm, 5 mm, 5.25 mm, 5.75 mm, etc.; or the thickness d of the main polar plate 120 and the pitch L can simultaneously satisfy 1.75 mm ≤ L-d ≤ 3.25 mm and 3.25 mm ≤ L+d ≤ 5.75 mm. In the case of the present embodiment, it is beneficial to further reduce the size and weight of the polar plate assembly 100, while the polar plate assembly 100 can be used to provide as much support as possible for the anode 200 and the cathode 300, so as to facilitate ensuring the stability and safety of the electrolysis process.

[0050] In some alternative embodiments, the electrolytic device can be a support structure, wherein the thickness d of the main electrode plate 120 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or any value between 0.5 mm and 1.5 mm, and the thickness d of the main electrode plate 120 and the spacing L satisfy at least one of the following conditions: 2.85≤L / d≤4.5, 1.75 mm≤L-d≤2.25 mm, 2.75 mm≤L-d≤3.25 mm, or 3.25 mm≤L+d≤5.25 mm.

[0051] For example, the thickness d of the main electrode plate 120 and the spacing L can satisfy 2.85≤L / d≤4.5, for example, L / d can be 2.85, 3, 3.15, 3.25, 3.5, 3.75, 4, 4.25, 4.5, etc.; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 1.75 mm≤L-d≤2.25 mm, for example, L-d can be 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm, 2 mm, 2.05 mm, 2.1 mm, 2.15 mm, 2.2 mm, 2.25 mm, etc.; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 2.75 mm≤L-d≤3.25 mm, for example, L-d can be 2.75 mm, 2.8 mm, 2.85 mm, 2.9 mm, 2.95 mm, 3 mm, 3.05 mm, 3.1 mm, 3.15 mm, 3.25 mm, etc.; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 3.25 mm≤L+d≤5.25 mm, for example, L+d can be 3.25 mm, 3.5 mm, 3.75 mm, 4 mm, 4.25 mm, 4.75 mm, 5 mm, 5.25 mm, etc.; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 2.85≤L / d≤4.5 and 1.75 mm≤L-d≤2.25 mm at the same time; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 2.85≤L / d≤4.5 and 2.75 mm≤L-d≤3.25 mm at the same time; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 1.75 mm≤L-d≤2.25 mm and 3.25 mm≤L+d≤5.25 mm at the same time; or the thickness d of the main electrode plate 120 and the spacing L can satisfy 2.75 mm≤L-d≤3.25 mm and 3.25 mm≤L+d≤5.25 mm at the same time.

[0052] In the case of the present embodiment, it is beneficial to further reduce the size and weight of the electrode plate assembly 100, while the electrode plate assembly 100 can provide sufficient support for the anode 200 and the cathode 300 as much as possible to facilitate ensuring the stability and safety of the electrolysis process.

[0053] In some optional embodiments, the distance L satisfies: 1.5 mm≤L≤4.5 mm, for example, the distance L can be 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm, or any value between 1.5 mm and 4.5 mm.

[0054] Specifically, when the distance L is too large, the size of the annular pole frame 110 in the second direction is large, resulting in a large size of the pole plate assembly 100 in the second direction, which is not conducive to the lightweight design of the pole plate assembly 100; when the distance L is too small, the size of the annular pole frame 110 in the second direction is small, resulting in a small size of the pole plate assembly 100 in the second direction, which is not conducive to the stability and safety of the electrolysis process. In the embodiment, the distance L is controlled to be within the above suitable range, which is conducive to both the lightweight design and the stability and safety of the electrolysis process.

[0055] In some optional embodiments, the thickness d of the main pole plate 120 satisfies: 0.5 mm≤d≤1.5 mm, for example, the thickness d can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or any value between 0.5 mm and 1.5 mm.

[0056] Specifically, when the thickness d of the main pole plate 120 is too large, the main pole plate 120 occupies a large space, increasing the cost of raw materials, and the current has a large loss when flowing through the main pole plate 120; when the thickness d of the main pole plate 120 is too small, the main pole plate 120 is difficult to effectively support the anode 200 and the cathode 300, resulting in insufficient structural strength of the electrolysis cell formed by the main pole plate 120, the anode 200, and the cathode 300. In the embodiment, the thickness d of the main pole plate 120 is controlled to be within the above suitable range, which can minimize the manufacturing cost and power consumption, effectively reduce the influence of the resistance of the main pole plate 120 on the electrolysis operation, and also will not affect the structural strength of the main pole plate 120.

[0057] In some optional embodiments, the thickness h of the annular pole frame 110 is the distance between the two first end surfaces A of the same annular pole frame 110, and the thickness h of the annular pole frame 110 satisfies: 5 mm≤h≤11 mm. For example, the thickness h can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, or any value between 5 mm and 11 mm.

[0058] It should be noted that when the annular pole frame 110 is a flat plate structure (i.e., the annular pole frame 110 is a structure with uniform thickness), the entire end surface of the annular pole frame 110 in the second direction is the first end surface A, and at this time, the thickness h of the annular pole frame 110 refers to the size of any part of the annular pole frame 110 in the second direction, as shown in FIG. 2; while when the annular pole frame 110 is a structure including different thickness parts, the first end surface A is located on the part of the annular pole frame 110 away from the main pole plate 120, and the thickness h of the annular pole frame 110 refers to the size of the part of the annular pole frame 110 having the first end surface A in the second direction.

[0059] Referring to FIGS. 2 and 3, the main pole plate 120 of two different structures is shown, and the thickness h of the annular pole frame 110, the spacing L, and the thickness d of the main pole plate 120 are shown.

[0060] For example, the thickness h of the annular pole frame 110 can be 11 mm, and the corresponding spacing L can be 4.5 mm; for another example, the thickness h of the annular pole frame 110 can be 9 mm, and the spacing L can be 3.5 mm; for another example, the thickness h of the annular pole frame 110 can be 7 mm, and the spacing L can be 2.5 mm; for another example, the thickness h of the annular pole frame 110 can be 5 mm, and the spacing L can be 1.5 mm. By controlling the thickness h of the annular pole frame 110 within the above suitable range, the pole plate assembly 100 has the advantage of thickness lightweight design, which can reduce the amount of raw materials such as carbon steel, and effectively reduce the cost.

[0061] It should be noted that in general, when a plurality of pole plate assemblies 100 are stacked for making an electrolytic device, the specifications of the plurality of pole plate assemblies 100 should be the same, i.e., the thickness h of the annular pole frame 110, the spacing L, and the thickness d of the main pole plate of all pole plate assemblies 100 are the same.

[0062] The annular pole frame 110 includes a main body 111 and a tongue plate 112 protruding on the inner side of the main body 111, and the main pole plate 120 is installed on the end edge of the tongue plate 112 and can be connected (such as welding, plug-in, etc.) with the tongue plate 112, and the two first end surfaces A are located on the main body 111.

[0063] Since the main pole plate 120 is connected with the main body 111 through the tongue plate 112, the spacing between the main body 111 and the main pole plate 120 is increased, so that during the installation of the main pole plate 120, the installation tool will not be interfered by the inner circumferential surface of the main body 111, and more operation space is provided during installation, facilitating the connection and installation of the main body 111 and the main pole plate 120. Moreover, when the main pole plate 120 is connected with the tongue plate 112 by welding, the thermal deformation of the main pole plate 120 and the main body 111 due to welding can also be avoided.

[0064] Specifically, the tongue plate 112 has two third end faces C parallel to the first end face A and the second end face B, and the distance between the two third end faces C is the thickness of the tongue plate 112. In order to ensure the connection reliability between the tongue plate 112 and the main plate 120, the thickness of the tongue plate 112 is greater than or equal to the thickness d of the main plate 120.

[0065] In some optional embodiments, the main body 111 includes a first section 111a and a second section 111b, the first section 111a, the second section 111b and the tongue plate 112 are connected in sequence, the first section 111a is arranged beyond the second section 111b at least on one side in the second direction to form a stepped structure 111c at the connection position of the first section 111a and the second section 111b, and the end face of the second section 111b in the second direction is the first end face A. Referring to FIG. 1, the stepped structure 111c formed between the first section 111a and the second section 111b of the main body 111 can cooperate with the anode 200 or the cathode 300, that is, the stepped structure 111c can be positioned for the installation of the anode 200 or the cathode 300, so as to facilitate the quick assembly of the anode 200 or the cathode 300.

[0066] In some optional embodiments, the size of the first section 111a in the second direction is greater than the size of the second section 111b in the second direction, and the first section 111a is arranged beyond the second section 111b on both sides in the second direction, so that the first section 111a forms a stepped structure 111c with the second section 111b on both sides.

[0067] Referring again to FIG. 1, the stepped structure 111c is arranged on both sides of the main body 111 in the second direction, so as to facilitate the installation of the anode 200 and the cathode 300 by using the two stepped structures 111c on both sides of the main body 111. Thus, when a plurality of plate assemblies 100 are arranged in a stacked manner in the second direction, the main plates 120 of adjacent plate assemblies 100 will form electrolytic cells between them, and a plurality of electrolytic cells can be connected in series to improve the electrolysis efficiency.

[0068] In some optional embodiments, the main body 111 and the tongue plate 112 are circular ring structures, and the main plate 120 is arranged in the hollow interior of the tongue plate 112. Specifically, in this embodiment, the diameter of the circular ring main body 111 is greater than the diameter of the circular ring tongue plate 112, and the circular ring main body 111 is sleeved outside the circular ring tongue plate 112. The main body 111 and the tongue plate 112 can be integrally stamped and formed, or can be separately formed and then connected as a whole by welding or other means. The circular ring design is more conducive to the uniform distribution of current, thereby better controlling the reaction process and reducing material and energy loss.

[0069] For the convenience of showing the technical solutions of the embodiments of the present application, the circular polar plate assembly 100 is taken as an example in the drawings of the present application. It should be noted that in other optional embodiments, the shapes of the main body 111 and the tongue plate 112 are not limited to the circular ring structure, for example, the main body 111 and the tongue plate 112 can also be in the form of a triangular ring structure, a rectangular ring structure, etc., which are not specifically limited in the embodiments of the present application.

[0070] In some optional embodiments, referring to FIGS. 1 and 2, the main polar plate 120 is in a flat plate structure, and the entire end surface of the main polar plate 120 in the second direction is the second end surface B.

[0071] In some optional embodiments, referring to FIG. 3, the main polar plate 120 includes a base plate 122 and a papilla 121 protruding from the surface of the base plate 122, and the second end surface B is located on the base plate 122, that is, the end surface of the base plate 122 in the second direction is the second end surface B.

[0072] Specifically, the distance f between the highest position of the papilla 121 protruding from the surface of the base plate 122 and the surface of the base plate 122 can be 1.7 mm-4.7 mm, the papilla 121 can be multiple in number, and the protruding directions of adjacent two papillae 121 relative to the base plate 122 are opposite to each other to respectively support the anode 200 and the cathode 300.

[0073] FIGS. 4 and 5 are respectively a side view and a partial structure schematic diagram of an electrolytic device provided by an embodiment of the present application, wherein the polar plate is in a circular ring structure, and the A-A plane cross-sectional structure in FIG. 4 is shown in FIG. 1.

[0074] Referring to FIGS. 1 and 4-5, according to another embodiment of the present application, an electrolytic device is provided, which includes the polar plate assembly 100, the anode 200, the cathode 300 and the diaphragm 400 of any one of the above embodiments. The anode 200 and the cathode 300 are respectively arranged on the two sides of the main polar plate 120 along the second direction, and the diaphragm 400 is arranged on the side of the cathode 300 or the anode 200 away from the main polar plate 120.

[0075] For example, the electrolytic device can be a filter-pressing bipolar plate and frame structure for alkaline water electrolysis hydrogen production. Specifically, the electrolytic device includes a plurality of polar plate assemblies 100 arranged in sequence along the second direction, and the polar plate assemblies 100 are shown in the form of a ring structure in the drawing, and each of the polar plate assemblies 100 is provided with a feed inlet 113 and a discharge outlet 114, the feed inlet 113 is used to feed electrolyte into the electrolytic device, and the discharge outlet 114 is used to discharge hydrogen, oxygen and waste liquid produced by electrolysis of water in the electrolytic device. The anode 200, the cathode 300 and the diaphragm 400 are arranged between adjacent polar plate assemblies 100, so that a separate electrolysis cell is formed between all adjacent polar plate assemblies 100, and all electrolysis cells are connected in series to form the entire electrolytic device.

[0076] With the adoption of the polar plate assembly 100 in the above embodiment, the size of the polar plate assembly 100 is within a proper range, so that the size of the electrolysis cell is also optimized. Specifically, under other conditions being unchanged, the resistance of the polar plate assembly 100 is approximately proportional to the size of the polar plate assembly 100 in the second direction, and since the thickness d of the main polar plate 120 and the interval L can be taken as the smallest values under a certain size relationship in the present embodiment, in particular, the size of the polar plate assembly 100 in the second direction is made as small as possible, so that the resistance of the polar plate assembly 100 can be reduced as much as possible, i.e., the transmission resistance can be reduced by optimizing the size of the electrolysis cell, the voltage of the electrolysis cell is reduced, and thus the power consumption is reduced.

[0077] In some optional embodiments, the main polar plate 120 has a flat plate structure, and the electrolysis device of the present embodiment further comprises a support 500 arranged between the anode 200 and the main polar plate 120 and between the cathode 300 and the main polar plate 120, respectively. The support 500 has a size in the second direction which is not less than the interval L. Preferably, the size of the support 500 in the second direction is greater than the interval L.

[0078] By arranging the support 500 in the interval L between the first end surface A and the second end surface B adjacent thereto, and setting the size of the support 500 in the second direction to be greater than or equal to the interval L between the first end surface A and the second end surface B adjacent thereto, effective support between the main polar plate 120 and the anode 200 and the cathode 300 is achieved.

[0079] Referring to FIGS. 1 and 2, the support 500 is arranged in a mesh structure (to avoid causing obstruction, the specific structure of the support 500 is not shown in the figure, and only the mounting position of the support 500 is shown), for example, the support 500 can be a flexible support net made of metal wire mesh, so that the electrolyte can flow freely inside the mesh support 500, and at the same time, the support 500 can also form effective support for the anode 200 and the cathode 300.

[0080] In some optional embodiments, the size of the support 500 in the second direction is 1.7-4.7 mm. For example, the size of the support 500 in the second direction can be 1.7 mm, 2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.5 mm, 3.7 mm, 4 mm, 4.5 mm, 4.7 mm, or any value between 1.7 mm and 4.7 mm.

[0081] Therefore, by controlling the support 500 within the above suitable range, when the anode 200 and the cathode 300 are installed on both sides of the main plate 120 to form the electrolytic cell, the support 500 can not only effectively support the anode 200 and the cathode 300, but also promote the uniform distribution of the electrolyte, which is conducive to improving the electrolysis efficiency.

[0082] In some optional embodiments, the main plate 120 comprises a substrate 122 and a papilla 121 protruding from the surface of the substrate 122, wherein the substrate 122 has two second end faces B parallel to the first end face A in the second direction, and the distance f between the highest position of the papilla 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 is not less than the interval L between the first end face A and the adjacent second end face B on the same main plate. Preferably, the distance f between the highest position of the papilla 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 is greater than the interval L between the first end face A and the adjacent second end face B on the same main plate.

[0083] Since the distance f between the highest position of the papilla 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 is greater than the interval L, when the anode 200 and the cathode 300 are installed on both sides of the main plate 120 in the second direction, the anode 200 and the cathode 300 will slightly extrude the papilla 121, so that the papilla 121 can effectively support the anode 200 and the cathode 300. Moreover, the papilla 121 can reduce the contact resistance and make the electrolyte more uniformly distributed, which is conducive to reducing the electrolysis energy consumption.

[0084] For example, referring to FIG. 3, the papilla 121 on the substrate 122 has a spherical structure protruding to both sides of the substrate 122. It should be understood that in other optional embodiments, the shape of the papilla 121 is not limited to the spherical structure, for example, the shape of the papilla 121 can be a conical structure, a circular truncated cone structure, a polyhedral structure, etc.

[0085] In some optional embodiments, the papilla 121 can be multiple in number, and the adjacent two papillae 121 are oppositely connected to the protruding direction of the connecting portion 122 to respectively support the anode 200 and the cathode 300.

[0086] In some alternative embodiments, the distance f between the highest position of the protrusion 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 is 1.7mm-4.7mm. For example, the distance f between the highest position of the protrusion 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 can be 1.7mm, 2mm, 2.5mm, 2.7mm, 3mm, 3.5mm, 3.7mm, 4mm, 4.5mm, 4.7mm or any value between 1.7mm and 4.7mm. For example, referring to FIG. 3, the interval L between the first end surface A and the second end surface B adjacent thereto can be 4.5mm, and accordingly, the distance f between the highest position of the protrusion 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 can be 4.7mm, i.e. the distance f between the highest position of the protrusion 121 protruding from the surface of the substrate 122 and the surface of the substrate 122 is greater than the interval L.

[0087] Therefore, by controlling the protrusion 121 within the above suitable range, when the anode 200 and the cathode 300 are installed on both sides of the main electrode plate 120 to form electrolytic cells, the protrusion 121 can not only effectively support the anode 200 and the cathode 300, but also promote the uniform distribution of the electrolyte, which is conducive to improving the electrolysis efficiency.

[0088] It can be understood that, in the electrolysis device of the present application, in order to effectively support the anode 200 and the cathode 300, the main electrode plate 120 of the electrode plate assembly 100 can be provided in a flat plate structure and cooperated with the support 500 to support the anode 200 and the cathode 300; or the protrusion 121 can be formed on the main electrode plate 120 of the electrode plate assembly 100 to support the anode 200 and the cathode 300, and of course other forms of electrode plate assembly structure can also be used.

[0089] In some alternative embodiments, the tongue plate 112 is arranged at the middle position of the main body 111 in the second direction, and the anode 200 and the cathode 300 are symmetrically arranged on both sides of the main electrode plate 120 along the second direction. Therefore, when the plurality of electrode plate assemblies 100 are stacked, the sizes of the electrolytic cells formed between adjacent electrode plate assemblies 100 are the same, which is conducive to synchronously controlling the electrolysis process in all electrolytic cells.

[0090] The following provides a specific embodiment to verify the specific effect of the electrolysis process.

[0091] Experimental specifications: the interval L of the electrode plate assembly 100 of the embodiment of the present application is 1.5-4.5mm, and the thickness of the annular electrode frame 110 is 5-11mm.

[0092] Experimental installation sequence:

[0093] Theoretical simulation software: comsol.

[0094] Simulation condition: total gas production 1000 standard cubic meters.

[0095] Simulation result: when the current, voltage and temperature are at the peak value, if the plate assembly 100 of the embodiment of the application is used, the electrolyte flow rate into the electrolysis chamber, the hydrogen and oxygen flow rate out of the electrolysis chamber and the electrolyte flow rate are increased, the electrolyte uniformity in the electrolysis chamber is improved, so that the gas content in the electrolysis chamber shows a downward trend, which means that more gas bubbles are taken away in unit time, the electrolyte resistance is reduced, and the electrolysis efficiency is improved. When the current, voltage and temperature are at the standard state, if the plate assembly 100 of the embodiment of the application is used, the flow rate in and out is faster, and the heat dissipation is faster, which is beneficial to reduce the maximum temperature of the electrolysis device. Moreover, the temperature gradient of temperature rise and temperature drop is reduced, so that the overpotential is also reduced, the theoretical decomposition voltage is reduced, which is beneficial to reduce the voltage of the electrolysis chamber and reduce the power consumption. From the simulation and experimental data, when the distance L of the plate assembly 100 is 1.5-4.5mm and the thickness h of the annular pole frame 110 is 5-11mm, the power consumption reduction value is 0.02-0.08kw / Nm3. Therefore, when the plate assembly 100 of the embodiment of the application is used, not only the lightweight and the cost of raw materials can be saved, but also the transmission resistance can be effectively reduced, so as to reduce the power consumption.

[0096] Fig. 6 is a structural schematic diagram of an electrolysis device provided by the embodiment of the application, wherein a plurality of plate assemblies have been assembled.

[0097] Referring to Fig. 6, another embodiment of the application provides an electrolysis device, which comprises at least two plate assemblies 100 according to any one of the embodiments, and the at least two plate assemblies 100 are arranged side by side. Specifically, the number of plate assemblies 100 can be two or more.

[0098] In an embodiment not shown, the annular pole frames 110 of the adjacent two plate assemblies 100 are arranged in close contact, that is, no other sealing member is arranged between the annular pole frames 110 of the adjacent two plate assemblies 100, but they are arranged in close contact with each other, so that the weight of the electrolysis device can be reduced.

[0099] In other embodiments, as shown in Fig. 6, a sealing member 600 is arranged between the annular pole frames 110 of the adjacent two plate assemblies 100, and the total thickness of the sealing member 600 and the annular pole frame 110 adjacent thereto is H, and 2L+d<H≤2L+d+3.3, so that the sealing property between the adjacent plate assemblies 100 can be ensured.

[0100] Specifically, each seal 600 is arranged between the first segments 111a of two adjacent annular pole frames 110, and the thickness H is the sum of the thickness of the first segment 111a of one assembled annular pole frame 110 and the thickness of the adjacent seal 600.

[0101] Although the embodiments of the present application have been shown and described above, it should be understood by those skilled in the art that the above embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A plate assembly, characterized in that: It includes a pole frame and a main pole plate; The pole frame includes a main body and a tongue plate. The tongue plate extends along a first direction and protrudes from the main body. There is a spacing L between the end face of the tongue plate in a second direction and the end face of the pole frame in the second direction. Here, the first direction is orthogonal to the second direction, and the second direction is parallel to the thickness direction of the tongue plate; The main pole plate extends along the first direction and is connected to the side of the tongue plate away from the main body. The thickness d of the main pole plate and the spacing L satisfy at least one of the following conditions: 0.75 ≤ L / d ≤ 9, -0.5 mm ≤ L - d ≤ 4 mm, or 2 mm ≤ L + d ≤ 6.5 mm.

2. The electrode plate assembly according to claim 1, characterized in that: The thickness d of the main pole plate and the spacing L satisfy at least one of the following conditions: 2.25 ≤ L / d ≤ 4.5, 1.75 mm ≤ L - d ≤ 3.25 mm, or 3.25 mm ≤ L + d ≤ 5.75 mm.

3. The pole plate assembly according to claim 1 or 2, wherein The spacing L satisfies: 1.5 mm ≤ L ≤ 4.5 mm; and / or The thickness d of the main pole plate satisfies: 0.5 mm ≤ d ≤ 1.5 mm; and / or The thickness h of the pole frame satisfies: 5 mm ≤ h ≤ 11 mm.

4. A plate assembly, characterized in that: It includes an annular pole frame and a main pole plate installed inside the annular pole frame; The annular pole frame has two first end faces that are parallel to each other. The main pole plate has two second end faces that are parallel to the first end faces. There is a spacing L between any one of the first end faces and the adjacent second end face. The thickness between the two second end faces of the main pole plate is d. The thickness d and the spacing L satisfy at least one of the following conditions: 0.75 ≤ L / d ≤ 9, -0.5 mm ≤ L - d ≤ 4 mm, or 2 mm ≤ L + d ≤ 6.5 mm.

5. The electrode plate assembly according to claim 4, characterized in that: The thickness d and the spacing L satisfy: L > d, and 1 < L / d ≤ 9 or 0 < L - d ≤ 4 mm.

6. The electrode plate assembly according to claim 4, characterized in that: The thickness d and the spacing L satisfy: L ≤ d, and 1 mm ≤ L + d ≤ 4 mm.

7. The electrode plate assembly according to claim 4, characterized in that: The thickness d and the spacing L satisfy at least one of the following conditions: 2.25 ≤ L / d ≤ 4.5, 1.75 mm ≤ L - d ≤ 3.25 mm, or 3.25 mm ≤ L + d ≤ 5.75 mm.

8. The electrode plate assembly according to claim 4, characterized in that: The thickness d and the spacing L satisfy at least one of the following conditions: 2.85 ≤ L / d ≤ 4.5, 1.75 mm ≤ L - d ≤ 2.25 mm, 2.75 mm ≤ L - d ≤ 3.25 mm, or 3.25 mm ≤ L + d ≤ 5.25 mm.

9. The electrode plate assembly according to any one of claims 4 to 8, characterized in that: The annular pole frame includes a main body and a tongue plate protruding from the inner side of the main body. The main pole plate is installed at the edge of the tongue plate, and the two first end faces are located on the main body.

10. The electrode plate assembly according to claim 9, characterized in that: The tongue plate has two third end faces that are parallel to the first end face and the second end face. The thickness between the two third end faces is greater than or equal to the thickness d between the two second end faces.

11. The pole plate assembly according to any one of claims 4 - 8, wherein The spacing L satisfies: 1.5 mm ≤ L ≤ 4.5 mm; and / or The thickness d satisfies: 0.5 mm ≤ d ≤ 1.5 mm; and / or The thickness h between the two first end faces of the annular pole frame satisfies the following: 5 mm ≤ h ≤ 11 mm.

12. The electrode plate assembly according to claim 11, characterized in that: The main electrode plate includes a substrate and a mastoid protruding from a surface of the substrate, and the second end surface is located on the substrate; The distance f between the highest position of the mastoid protruding from the substrate surface and the substrate surface satisfies: 1.7 mm ≤ f ≤ 4.7 mm; and / or The protrusion directions of two adjacent mastoids relative to the base plate are opposite.

13. An electrolysis device, characterized in that: Comprising at least two electrode plate assemblies according to any one of claims 4 to 12, wherein the at least two electrode plate assemblies are arranged side by side; Wherein, the annular pole frames of two adjacent pole plate assemblies are arranged in close contact; or, A seal is provided between the annular pole frames of two adjacent plate assemblies. The total thickness of the seal and the adjacent annular pole frame is H, 2L+d <H≤2L+d+3.3。 14. An electrolysis device, characterized in that: The electrode plate assembly comprises any one of claims 4-12, further comprising an anode, a cathode, and a diaphragm, wherein the anode and the cathode are respectively arranged on both sides of the main electrode plate along the thickness direction thereof, and the diaphragm is arranged on the side of the cathode or the anode away from the main electrode plate.

15. The electrolysis device according to claim 13, characterized in that The main electrode plate is a flat plate structure, and the electrolysis device further includes a support member, and the support member is provided between the anode and the main electrode plate and between the cathode and the main electrode plate, and the dimension of the support member in the thickness direction of the main electrode plate is not less than the distance L; and / or The main electrode plate includes a substrate and a mastoid protruding from a surface of the substrate. The distance f between the highest position of the mastoid protruding from the surface of the substrate and the surface of the substrate is not less than the distance L.

16. The electrolysis device according to claim 13, characterized in that The dimension of the support member in the thickness direction of the main pole plate is 1.7 mm to 4.7 mm; and / or The distance f between the highest position of the mastoid protruding from the substrate surface and the substrate surface is 1.7 mm to 4.7 mm.

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