Electrolytic cell and hydrogen production plant

Abstract

The application discloses an electrolytic cell and a hydrogen production device. The electrolytic cell comprises end plates, a pull rod, a first insulating piece and a second insulating piece. The end plates are provided with through holes. The pull rod is provided with two ends penetrating the through holes of the end plates. The first insulating piece is sleeved on the pull rod. Part of the first insulating piece is located between the two end plates, and the other part of the first insulating piece extends into the through hole. The pull rod has an exposed part extending into the through hole and not sleeved by the first insulating piece. At least part of the second insulating piece is fixed in the through hole. At least part of the second insulating piece surrounds the first insulating piece, and at least another part of the second insulating piece surrounds the exposed part. The technical scheme can reduce the risk of short circuit between the pull rod and the end plate under the hot state.

Description

Technical Field

[0001] This application relates to the field of electrolysis technology, and in particular to an electrolyzer and a hydrogen production device using the electrolyzer. Background Technology

[0002] An electrolytic cell includes two opposing end plates and a tie rod passing through the two end plates. The tie rod is covered with a first insulating tube. When the electrolytic cell is in hot operation, the distance between the two end plates will increase. This will cause the end of the first insulating tube outside the tie rod to fall off, which may easily cause the tie rod to come into contact with the end plate and short circuit. Utility Model Content

[0003] The main purpose of this application is to propose an electrolyzer and hydrogen production equipment, which aims to improve the problem of short circuit in the contact between the tie rod and the end plate.

[0004] To achieve the above objectives, the electrolytic cell proposed in this application includes end plates, a pull rod, a first insulating member, and a second insulating member; at least two end plates are provided, and the at least two end plates are arranged opposite each other, and each end plate has a through hole; the two ends of the pull rod respectively pass through the through holes of the two end plates; the first insulating member is sleeved on the pull rod, a portion of the first insulating member is located between the two oppositely arranged end plates, and another portion extends into the through hole; the pull rod has an exposed portion extending into the through hole and not covered by the first insulating member; at least a portion of the second insulating member is fixedly disposed in the through hole; at least a portion of the second insulating member surrounds the first insulating member, and at least another portion also surrounds the exposed portion.

[0005] In one embodiment, the electrolytic cell further includes an electrode assembly disposed between two oppositely arranged end plates; a first limiting step is provided in the through hole, and a second insulating member abuts against the side of the first limiting step away from the electrode assembly.

[0006] In one embodiment, the through hole includes a first mounting hole and a second mounting hole, the first mounting hole communicating with the second mounting hole, the first mounting hole being located at the end of the second mounting hole away from the electrode assembly, and the diameter of the first mounting hole being larger than the diameter of the second mounting hole; a first limiting step is formed between the first mounting hole and the second mounting hole; the second insulating member includes a first straight cylindrical section, the first straight cylindrical section being located inside the first mounting hole, and a portion of the first straight cylindrical section surrounding a portion of the first insulating member.

[0007] In one embodiment, the second insulating member further includes a second straight cylindrical section located within the second mounting hole and connected to the first straight cylindrical section, the second straight cylindrical section surrounding the first insulating member.

[0008] In one embodiment, the surface of the end plate facing the electrode assembly is defined as the inner plate surface; the distance from the first limiting step to the inner plate surface is L, 10mm≤L≤20mm.

[0009] In one embodiment, the surface of the end plate facing away from the electrode assembly is defined as the outer plate surface; an insulating ring is fixedly provided on the outer plate surface, and the projection of the insulating ring on the outer plate surface partially obscures the through hole, and the second insulating member abuts against the insulating ring.

[0010] In one embodiment, the insulating ring is detachably connected to the outer plate surface.

[0011] In one embodiment, the electrolytic cell further includes an electrode assembly disposed between two oppositely disposed end plates; the second insulating member includes: A first cylindrical section, disposed within the through hole, at least a portion of the first cylindrical section surrounds the first insulating member, and at least another portion also surrounds the exposed portion; and A limiting retaining ring is connected to the end of the first straight cylinder section away from the electrode assembly, and the limiting retaining ring abuts against the side of the end plate away from the electrode assembly.

[0012] In one embodiment, the second insulating element is an insulating coating layer applied to the inner wall of the through hole, the insulating coating layer covering the entire inner wall surface of the through hole.

[0013] This application also proposes a hydrogen production apparatus, including the aforementioned electrolyzer.

[0014] This application allows the end plates to move along the length of the pull rod by passing through two through holes in the end plates at both ends of the pull rod, thus adapting to the thermal expansion and contraction of the electrolytic cell. By sleeved on the outside of the pull rod and partially extending into the through holes, and by having an exposed portion extending into the through holes but not covered by the first insulating member, the risk of deformation of the first insulating member due to pressure exerted by external components of the end plates can be reduced when the electrolytic cell is in a cold state. By fixing at least a portion of the second insulating member within the through holes, with at least a portion surrounding the first insulating member and at least another portion surrounding the exposed portion, the relative movement between the first and second insulating members occurs when the end plates move under hot conditions. The second insulating member provides insulation protection for the exposed portion of the pull rod, and the first insulating member provides insulation protection for areas of the pull rod other than the exposed portion within the through holes, thereby reducing the risk of short circuits caused by contact between the pull rod and the end plates. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a partial cross-sectional view of an embodiment of the electrolytic cell of this application; Figure 2 This is a partial cross-sectional view of yet another embodiment of the electrolytic cell of this application; Figure 3 This is a cross-sectional view of an embodiment of the end plate in the electrolytic cell of this application; Figure 4 This is a partial cross-sectional view of another embodiment of the electrolytic cell of this application; Figure 5 This is a partial cross-sectional view of another embodiment of the electrolytic cell of this application.

[0017] Explanation of icon numbers: 100. End plate; 101. Through hole; 1011. First mounting hole; 1012. Second mounting hole; 110. First limiting step; 1001. Inner plate surface; 1002. Outer plate surface; 200. Pull rod; 300. First insulating component; 400. Second insulating component; 410. First straight cylindrical section; 420. Second straight cylindrical section; 430. Limiting retaining ring; 500, Insulating ring.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] An electrolytic cell includes two opposing end plates and a tie rod passing through them, with an insulating tube covering the tie rod. Because the electrolytic cell expands and contracts with temperature during operation, if the insulating tube is fully embedded within the end plates, it will deform under stress when cold. Secondly, considering the potential movement of the end plates due to thermal expansion and contraction, a section of the tie rod and end plate is not insulated, which can easily lead to a short circuit between them. Furthermore, the insulating tube can easily become stuck at one end due to tie rod deformation, while the other end can easily detach from the end plate during thermal expansion, also increasing the risk of a short circuit between the tie rod and the end plate.

[0023] To address the short circuit issue between the tie rod and the end plate, this application proposes an electrolytic cell, please refer to the following reference. Figures 1 to 3 The electrolytic cell includes an end plate 100, a pull rod 200, a first insulating member 300, and a second insulating member 400. At least two end plates 100 are provided, arranged opposite to each other, and each end plate 100 has a through hole 101. The two ends of the pull rod 200 pass through the through holes 101 of the two end plates 100 respectively. The first insulating member 300 is sleeved on the outside of the pull rod 200, with a portion of the first insulating member 300 located between the two oppositely arranged end plates 100, and another portion extending into the through hole 101. The pull rod 200 has an exposed portion extending into the through hole 101 but not covered by the first insulating member 300. At least a portion of the second insulating member 400 is fixedly disposed within the through hole 101. At least a portion of the second insulating member 400 surrounds the first insulating member 300, and at least a portion also surrounds the exposed portion.

[0024] At least two end plates 100 are arranged opposite each other, and each end plate 100 has a through hole for a pull rod 200 to pass through. The pull rod 200 is a component used to connect the two oppositely arranged end plates 100 together; it can be a cylindrical rod or a prism rod. The two ends of the pull rod 200 are respectively connected to the through holes 101 of the two end plates 100, so that when the electrolytic cell undergoes thermal expansion and contraction, the two end plates 100 can move closer or further apart along the length of the pull rod 200. The end of the pull rod 200 can be connected to a bolt assembly to limit the movement of the end plates 100 along the length of the pull rod 200, preventing the end plates 100 from detaching from the pull rod 200. Since the pull rod 200 and the end plates 100 are usually made of metal, a first insulating element 300 is also fitted over the pull rod 200 to reduce the risk of short circuit between them. Furthermore, based on the arrangement where the first insulating member 300 is sleeved outside the pull rod 200, a portion of the first insulating member 300 is located between the two opposing end plates 100, thereby improving the insulation effect between the pull rod 200 and other components between the two end plates 100. Another portion of the first insulating member 300 extends into the through hole 101 and is sleeved outside the pull rod 200. The pull rod 200 also has an exposed portion extending into the through hole 101 that is not covered by the first insulating member 300. Therefore, a portion of the pull rod 200 located in the through hole 101 of the end plate 100 is covered by the first insulating member 300, while the other portion is exposed. With this arrangement, when some elastic support components are provided on the outer side of the end plate 100 to support the end plate 100, under cold conditions, the elastic support components move with the end plate 100, making it less likely for the two end plates 100 to come close together and thus reducing the risk of deformation of the first insulating member 300.

[0025] By fixing at least a portion of the second insulating member 400 within the through hole 101, the second insulating member 400 can move synchronously with the end plate 100. Furthermore, by having at least a portion of the second insulating member 400 surround the first insulating member 300, and at least another portion surround the exposed portion, when the end plate 100 moves relative to the pull rod 200 under hot conditions, the exposed portion of the pull rod 200 can be isolated by the second insulating member 400 as its size increases. This reduces the risk of the pull rod 200 contacting the inner wall of the through hole 101 of the end plate 100, thereby reducing the risk of a short circuit between the pull rod 200 and the end plate 100. Specifically, the second insulating member 400 can be made of rubber or silicone, and it can also be a sleeve structure. It is understood that when the second insulating member 400 is a sleeve structure, in order to ensure that at least a portion of the second insulating member 400 surrounds the first insulating member 300, the inner diameter of the second insulating member 400 is larger than the inner diameter of the first insulating member 300. To ensure the second insulating member 400 is fixedly disposed within the through hole 101, limiting members can be provided at both ends of the second insulating member 400 to restrict its movement, thereby achieving the effect of fixing the second insulating member 400 within the through hole 101. Alternatively, a mechanical connection structure can be used to fix the second insulating member 400 to the end plate 100, such as through snap-fit ​​connection or welding. Alternatively, the second insulating member 400 can be an insulating coating layer, i.e., an insulating coating is applied to the inner wall of the through hole 101, thereby forming the second insulating member 400. The second insulating member 400 can completely cover the inner wall of the through hole 101 axially, or it can cover part of the inner wall of the through hole 101, as long as the second insulating member 400 at least partially surrounds the first insulating member 300, and the other part surrounds the exposed portion.

[0026] This application allows the end plates 100 to move along the length of the pull rod 200 by passing through the two end holes 101 of the end plates 100 at both ends, thereby adapting to the thermal expansion and contraction of the electrolytic cell. By sleeved the first insulating member 300 on the outside of the pull rod 200 and partially extending into the through hole 101, and by having an exposed portion of the pull rod 200 extending into the through hole 101 but not covered by the first insulating member 300, the risk of the first insulating member 300 being deformed due to pressure exerted on it by components outside the end plate 100 can be reduced when the electrolytic cell is in a cold state. By fixing at least a portion of the second insulating member 400 within the through hole 101, with at least a portion of the second insulating member 400 surrounding the first insulating member 300 and at least another portion surrounding the exposed portion, the first insulating member 300 and the second insulating member 400 move relative to each other when the end plate 100 moves under hot conditions. The second insulating member 400 can provide insulation protection for the exposed portion of the pull rod 200, and the first insulating member 300 can provide insulation protection for other areas of the pull rod 200 other than the exposed portion within the through hole 101, thereby reducing the risk of short circuit due to contact between the pull rod 200 and the end plate 100.

[0027] Please refer to the reference. Figures 1 to 3 In some examples of this application, the electrolytic cell also includes an electrode assembly disposed between two oppositely arranged end plates 100; a first limiting step 110 is provided in the through hole 101, and a second insulating member 400 abuts against the side of the first limiting step 110 away from the electrode assembly.

[0028] The electrode assembly is an important component of the electrolytic cell. The electrode assembly is located between two opposite end plates 100. The electrode assembly includes multiple stacked electrode plates to form a multi-layered chamber structure for electrolytic reaction.

[0029] Understandably, when the first insulating member 300 is sleeved outside the pull rod 200 and partially extends into the through hole 101, the pull rod 200 has an exposed portion extending into the through hole 101 that is not covered by the first insulating member 300. Therefore, the first insulating member 300 only provides insulation protection for the portion of the pull rod 200 located within the through hole 101. Furthermore, since the first insulating member 300 is sleeved outside the pull rod 200, when it extends into the through hole 101, it enters the through hole 101 from the end closest to the electrode assembly. Therefore, the exposed portion of the pull rod 200 not covered by the first insulating member 300 is located at the end of the through hole 101 furthest from the electrode assembly. In this example, a first limiting step 110 is provided in the through hole 101, and the second insulating member 400 abuts against the side of the first limiting step 110 away from the electrode assembly. This allows the first limiting step 110 to limit the second insulating member 400 in the direction toward the electrode assembly. When under hot conditions, the end plates 100 on opposite sides of the electrode assembly move away from each other. At this time, the second insulating member 400 in the through hole 101 is abutted by the side of the first limiting step 110 away from the electrode assembly. Therefore, the second insulating member 400 will move synchronously with the end plate 100, reducing the risk of the second insulating member 400 falling out of the through hole 101. This ensures that the second insulating member 400 always has a good insulation effect on the exposed part of the pull rod 200, reducing the risk of short circuit caused by contact between the exposed part of the pull rod 200 and the end plate 100.

[0030] Specifically, the first limiting step 110 can be a limiting ring structure embedded in the through hole 101, or the through hole 101 can be set into the shape of a stepped hole, so that the first limiting step 110 structure is naturally formed inside it.

[0031] Please refer to the reference. Figures 1 to 3 In some examples of this application, the through hole 101 includes a first mounting hole 1011 and a second mounting hole 1012. The first mounting hole 1011 communicates with the second mounting hole 1012. The first mounting hole 1011 is located at the end of the second mounting hole 1012 away from the electrode assembly, and the diameter of the first mounting hole 1011 is larger than the diameter of the second mounting hole 1012. A first limiting step 110 is formed between the first mounting hole 1011 and the second mounting hole 1012. The second insulating member 400 includes a first straight cylindrical section 410, which is located inside the first mounting hole 1011, and a portion of the first straight cylindrical section 410 surrounds a portion of the first insulating member 300.

[0032] In the second insulating member 400, the first cylindrical section 410 is located inside the first mounting hole 1011, and part of the first cylindrical section 410 surrounds part of the first insulating member 300. Then the second insulating member 400 can be limited by the first limiting step 110. When under hot conditions, the end plates 100 on opposite sides of the electrode assembly move away from each other. At this time, the second insulating member 400 in the through hole 101 is held by the side of the first limiting step 110 away from the electrode assembly. Therefore, the second insulating member 400 will move synchronously with the end plate 100, reducing the risk of the second insulating member 400 falling out of the through hole 101. This ensures that the second insulating member 400 always has a good insulation effect on the exposed part of the pull rod 200, reducing the risk of short circuit caused by the exposed part of the pull rod 200 contacting the end plate 100.

[0033] In addition, by including a first mounting hole 1011 and a second mounting hole 1012 that are interconnected, with the first mounting hole 1011 located at the end of the second mounting hole 1012 away from the electrode assembly, and a first limiting step 110 formed between the first mounting hole 1011 and the second mounting hole 1012, it is easier to process the through hole 101, and the first limiting step 110 has better strength.

[0034] Please refer to the reference. Figure 2 and Figure 3 Based on the through hole 101 including the aforementioned first mounting hole 1011 and second mounting hole 1012, in some examples of this application, the second insulating member 400 further includes a second straight section 420, which is located inside the second mounting hole 1012 and connected to the first straight section 410, and surrounds the first insulating member 300.

[0035] The first straight section 410 and the second straight section 420 can be connected integrally, or they can be connected by snap-fit ​​or other means. The second straight section 420 surrounds the first insulating member 300, meaning it surrounds the area of ​​the first insulating member 300 not surrounded by the first straight section 410. The second straight section 420 can completely enclose the area of ​​the first insulating member 300 not surrounded by the first straight section 410, or it can only enclose a portion of the area of ​​the first insulating member 300 not surrounded by the first straight section 410.

[0036] By setting a second straight section 420 and connecting the second straight section 420 to the first straight section 410, the area covered by the second insulating member 400 on the inner wall of the through hole 101 is larger, thereby improving the insulation effect between the pull rod 200 and the end plate 100.

[0037] like Figure 3As shown, in some examples of this application, the surface of the end plate 100 facing the electrode assembly is defined as the inner plate surface 1001; the distance from the first limiting step 110 to the inner plate surface 1001 is L, 10mm≤L≤20mm.

[0038] Specifically, the distance L from the first limiting step 110 to the inner plate surface 1001 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0039] When the distance L from the first limiting step 110 to the inner plate surface 1001 is set to be not less than 10mm, the thickness of the first limiting step 110 is increased, thereby improving the strength of the first limiting step 110. When the distance L from the first limiting step 110 to the inner plate surface 1001 is set to be not greater than 20mm, the area covered by the second insulating member 400 in the through hole 101 is larger, thereby providing better insulation protection for the pull rod 200 and improving the insulation performance between the pull rod 200 and the end plate 100.

[0040] Please refer to the reference. Figure 1 and Figure 2 In some examples of this application, the surface of the end plate 100 facing away from the electrode assembly is defined as the outer plate surface 1002; the outer plate surface 1002 is fixedly provided with an insulating ring 500, the projection of the insulating ring 500 on the outer plate surface 1002 is shielded by a through hole 101, and the second insulating member 400 abuts against the insulating ring 500.

[0041] The insulating ring 500 can be fixed to the outer plate surface 1002 by adhesive, snap-fit, or other means, or it can be fixed to the outer plate surface 1002 by other supporting components. The projection of the insulating ring 500 onto the outer plate surface 1002 partially obscures the through hole 101. Therefore, when the second insulating member 400 is disposed within the through hole 101, the end of the second insulating member 400 away from the electrode assembly can be limited by the insulating ring 500. Additionally, the insulating ring 500 can also serve as a gasket to connect the end plate 100 to other external components.

[0042] By abutting the second insulating member 400 against the insulating ring 500, the second insulating member 400 can be fixed in the through hole 101 under the combined action of the insulating ring 500 and the first limiting step 110, reducing the risk of the second insulating member 400 sliding in the through hole 101. Therefore, the insulation effect of the second insulating member 400 on the exposed part of the pull rod 200 can be improved, and the risk of short circuit caused by direct contact between the pull rod 200 and the end plate 100 can be reduced.

[0043] Please refer to the reference. Figure 1 and Figure 2In some examples of this application, the insulating ring 500 is detachably connected to the outer panel 1002.

[0044] The insulating ring 500 and the outer panel 1002 can be connected by snap-fit, abutment or other detachable connection methods.

[0045] By detachably connecting the insulating ring 500 to the outer panel 1002, the second insulating component 400 can be installed from the end of the through hole 101 facing the insulating ring 500, thus making the installation of the second insulating component 400 more convenient.

[0046] Please refer to the reference. Figure 4 and Figure 5 In some examples of this application, the electrolytic cell further includes an electrode assembly disposed between two opposing end plates 100; the second insulating member 400 includes a first cylindrical section 410 and a retaining ring 430, the first cylindrical section 410 is located inside the through hole 101, at least a portion of the first cylindrical section 410 surrounds the first insulating member 300, and at least another portion surrounds the exposed portion; the retaining ring 430 is integrally connected to the end of the first cylindrical section 410 away from the electrode assembly, and the retaining ring 430 abuts against the side of the end plate 100 away from the electrode assembly.

[0047] The through hole 101 can be a straight through hole or a stepped hole. That is, a limiting boss can be provided in the through hole 101 or it can be without a limiting boss. After the first straight cylindrical section 410 extends into the through hole 101, it can completely cover the through hole 101 or cover part of the through hole 101, as long as at least a part of the first straight cylindrical section 410 surrounds the first insulating member 300 and at least another part surrounds the exposed part.

[0048] By integrating the first cylindrical section 410 with the limiting ring 430, and with at least a portion of the first cylindrical section 410 surrounding the first insulating member 300 and at least another portion surrounding the exposed portion, the second insulating member 400 can cover at least a portion of the area inside the through hole 101 and also cover a portion of the end plate 100 away from the electrode assembly. This increases the coverage area of ​​the second insulating member 400 on the end plate 100 and reduces the risk of a short circuit due to direct contact between the pull rod 200 and the end plate 100. On the other hand, the limiting ring 430 can be directly used as a gasket to connect other external components of the end plate 100 to the end plate 100.

[0049] In some examples of this application, the second insulating element 400 is an insulating coating layer applied to the inner wall of the through hole 101, and the insulating coating layer covers the entire inner wall surface of the through hole 101.

[0050] By setting the second insulating element 400 as an insulating coating layer, the number of parts can be reduced, and the risk of the second insulating element 400 moving within the through hole 101 can be decreased. Furthermore, by covering the entire inner wall surface of the through hole 101 with the insulating coating layer, the insulation effect of the insulating coating layer on the tie rod 200 is improved, reducing the risk of a short circuit due to direct contact between the tie rod 200 and the end plate 100.

[0051] This application also proposes a hydrogen production device, which includes an electrolyzer. The specific structure of the electrolyzer is as described in the above embodiments. Since this hydrogen production device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0052] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrolytic cell, characterized in that, include: End plates, wherein at least two end plates are provided, the at least two end plates are arranged opposite to each other, and the end plates are provided with through holes; A pull rod, wherein each end of the pull rod is respectively provided with a through hole in one of the two end plates; A first insulating element is sleeved on the outside of the pull rod, a portion of the first insulating element is located between two oppositely arranged end plates, and another portion extends into the through hole; the pull rod has an exposed portion that extends into the through hole and is not covered by the first insulating element; as well as A second insulating member, at least a portion of which is fixedly disposed within the through hole; at least a portion of the second insulating member surrounds the first insulating member, and at least another portion surrounds the exposed portion.

2. The electrolytic cell as described in claim 1, characterized in that, The electrolytic cell also includes an electrode assembly, which is disposed between two oppositely arranged end plates; a first limiting step is provided in the through hole, and the second insulating member abuts against the side of the first limiting step away from the electrode assembly.

3. The electrolytic cell as described in claim 2, characterized in that, The through hole includes a first mounting hole and a second mounting hole. The first mounting hole communicates with the second mounting hole. The first mounting hole is located at the end of the second mounting hole away from the electrode assembly, and the diameter of the first mounting hole is larger than the diameter of the second mounting hole. A first limiting step is formed between the first mounting hole and the second mounting hole. The second insulating member includes a first cylindrical section located within the first mounting hole, and a portion of the first cylindrical section surrounds a portion of the first insulating member.

4. The electrolytic cell as described in claim 3, characterized in that, The second insulating member further includes a second straight section located within the second mounting hole and connected to the first straight section, the second straight section surrounding the first insulating member.

5. The electrolytic cell as described in claim 3, characterized in that, The surface of the end plate facing the electrode assembly is defined as the inner plate surface; the distance from the first limiting step to the inner plate surface is L, 10mm≤L≤20mm.

6. The electrolytic cell according to any one of claims 2 to 5, characterized in that, The surface of the end plate facing away from the electrode assembly is defined as the outer plate surface; an insulating ring is fixedly provided on the outer plate surface, and the projection of the insulating ring on the outer plate surface partially blocks the through hole, and the second insulating member abuts against the insulating ring.

7. The electrolytic cell as described in claim 6, characterized in that, The insulating ring is detachably connected to the outer panel.

8. The electrolytic cell as described in claim 1, characterized in that, The electrolytic cell also includes an electrode assembly, which is disposed between two oppositely arranged end plates; The second insulating element includes: A first cylindrical section, disposed within the through hole, at least a portion of the first cylindrical section surrounds the first insulating member, and at least another portion also surrounds the exposed portion; and A limiting retaining ring is connected to the end of the first straight cylinder section away from the electrode assembly, and the limiting retaining ring abuts against the side of the end plate away from the electrode assembly.

9. The electrolytic cell as described in claim 1, characterized in that, The second insulating element is an insulating coating layer applied to the inner wall of the through hole, and the insulating coating layer covers the entire inner wall surface of the through hole.

10. A hydrogen production device, characterized in that, Includes the electrolytic cell as described in any one of claims 1 to 9.

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