Electrode plate with ring-shaped ribs, electrolytic cell and high-pressure electrolyzer

Abstract

The present application relates to a kind of electrode plate with annular convex strip, a kind of electrolytic unit and a kind of high-pressure electrolytic cell, belong to pressure electrolytic cell technical field.The electrode plate is divided into anode electrode plate and cathode electrode plate and is formed with two annular convex strips on the edge circle of electrolytic area on the positive and negative sides of anode electrode plate or cathode electrode plate, respectively, is inner annular convex strip and outer annular convex strip;The outer annular convex strip on the side of the anode electrode plate or cathode electrode plate after closing forms the first circle line seal with the side of cathode electrode plate or anode electrode plate, and the inner annular convex strip on the side of anode electrode plate or cathode electrode plate forms the second circle line seal with the side of electrolytic diaphragm;The electrolytic unit is formed by a pair of the above-mentioned cathode electrode plate and anode electrode plate after pressing the electrolytic diaphragm;The high-pressure electrolytic cell is formed by a plurality of the above-mentioned electrolytic unit after pressing each other.The electrolytic unit even high-pressure electrolytic cell formed by the electrode plate can withstand the great pressure difference between electrolytic reaction area and outside world without leaking and realizes high-pressure hydrogen production and oxygen production.

Description

Technical Field

[0001] This invention relates to an electrode plate for a high-voltage electrolytic cell, an electrolysis unit formed by the electrode plate, and a high-voltage electrolytic cell formed by the electrolysis unit, belonging to the technical field of pressure electrolytic cells. Background Technology

[0002] Chinese patent CN219032404U discloses an electrolytic cell for producing high-pressure hydrogen and oxygen, such as... Figure 1 As shown, the electrolytic cell is composed of three types of planar components: an electrode plate, a sealing gasket, and a diaphragm, all of which are flat and closely fitted together. Each electrolytic cell is formed by stacking and tightly bonding the first sealing gasket 103, the anode plate 104, the second sealing gasket 106, the cathode plate 107, the second sealing gasket 106, and the diaphragm 105 together. Because the electrode plate, sealing gasket, and diaphragm of the electrolytic cell are all flat and closely fitted together, a planar seal is formed between them after compression. However, the inventors of the aforementioned patent discovered in subsequent experiments during the fabrication of the electrolytic cell that as the electrolytic reaction continuously generates gases (hydrogen and oxygen) and gradually builds up high pressure, gas-liquid leakage occurs between the electrode plate, sealing gasket, and diaphragm, resulting in seal failure. Therefore, the inventors of the aforementioned patent conducted in-depth research on the planar sealing structure of the electrolytic cell components and made further improvements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to improve the electrode plate and its composition structure of the electrolytic cell disclosed in the above patent, so as to meet the needs of high-pressure electrolysis sealing and ultimately achieve high-pressure extraction of hydrogen and oxygen.

[0004] The technical solution proposed by the present invention to solve the above-mentioned technical problems is: an electrode plate with ring-shaped convex strips for use in a high-voltage electrolytic cell. The electrode plate has an electrolytic region in the middle of the front and back sides for participating in the electrolytic reaction, and a liquid inlet hole, two liquid outlet gas holes and multiple small through holes are formed in the region. The electrode plate is divided into an anode plate and a cathode plate. Two rings of convex strips are formed around the edge of the electrolytic region on the front and back sides of the anode plate or cathode plate, namely an inner ring convex strip and an outer ring convex strip.

[0005] The second technical solution proposed by the present invention to solve the above-mentioned technical problem is: an electrolysis unit, comprising a pair of electrode plates with ring-shaped protrusions as the negative electrode plate and the positive electrode plate respectively, sandwiched together with an electrolysis diaphragm and then pressed together, wherein the electrolysis diaphragm covers the electrolysis area, and the electrolysis diaphragm has openings corresponding to the liquid inlet and liquid outlet holes respectively; the outer ring protrusion on the side of the positive electrode plate after being joined together forms a first ring seal with the side of the negative electrode plate or the outer ring protrusion on the side of the negative electrode plate and the side of the positive electrode plate; and the inner ring protrusion on the side of the positive electrode plate after being joined together forms a second ring seal with the side of the electrolysis diaphragm or the inner ring protrusion on the side of the negative electrode plate and the side of the electrolysis diaphragm.

[0006] The third technical solution proposed by the present invention to solve the above-mentioned technical problems is: a high-voltage electrolytic cell, which is formed by stacking and pressing multiple electrolytic units of the above-mentioned technical solution two together. The liquid inlet hole and its corresponding opening are used for the electrolyte to enter and fill the electrolytic area on both sides of the electrode plate. The two liquid outlet gas holes and their corresponding openings are used to export the gas and liquid after the electrolytic reaction on the cathode side and the anode side respectively.

[0007] Furthermore, on both sides of the positive or negative electrode plate, there are two annular grooves, an inner annular groove and an outer annular groove, around the edge of the electrolysis area. The inner and outer protrusions are respectively the inner and outer O-rings filled in the inner and outer annular grooves, and the thickness of the O-rings is greater than the depth of the annular grooves.

[0008] Furthermore, the raised strips are two rings of adhesive strips glued to the side of the electrode plate.

[0009] Furthermore, the raised strip is formed by two rings of plating on the side of the electrode plate.

[0010] Furthermore, the raised strip is integrally formed with the electrode plate.

[0011] Furthermore, the cross-sectional shape of the protrusion is trapezoidal, triangular, quadrilateral, or prismatic.

[0012] After in-depth research into the component sealing structure of the existing electrolytic cell unit assembly, the inventors of this patent application discovered the following: 1. The seal formed between the compressed electrode plate, gasket, and diaphragm is planar. Due to manufacturing precision limitations, it is difficult to achieve a high degree of flatness in the sealing surfaces of the electrode plate, gasket, and diaphragm. When the electrolytic reaction zone gradually generates gas and liquid to form high pressure, a large pressure difference is created with the outside environment. Under this large pressure difference, the seal between the electrode plate, gasket, and diaphragm is prone to failure. 2. Because the seal formed between the electrode plate, gasket, and diaphragm is planar, although axial force is applied after compression to form a constraint, there is no effective constraint in the radial direction. Therefore, under the force of high-pressure gas and liquid generated in the electrolytic reaction zone, slight movement is easily generated on the plane, which leads to the seal between the electrode plate, gasket, and diaphragm easily failing.

[0013] The beneficial effects of this invention are as follows: By eliminating the original sealing gasket and directly forming inner and outer rings of raised strips on both sides of the anode or cathode electrode plate, when the cathode and anode electrode plates are clamped together to form an electrolytic unit after the electrolytic separator is sandwiched between them, the outer ring of raised strips on the side of the anode electrode plate forms a first ring of line seal with the side of the cathode electrode plate, or vice versa. The inner ring of raised strips on the side of the anode electrode plate forms a second ring of line seal with the side of the electrolytic separator, or vice versa. This replaces the planar seal formed by the sealing gasket between the existing electrode plates, improving sealing performance. Furthermore, when the ring-shaped raised strips are O-rings inserted into the annular grooves on the side of the electrode plates, the O-rings can be constrained radially, preventing radial movement and leakage that is common in planar seals between existing sealing gaskets and electrode plates. Therefore, it can withstand a large pressure difference between the electrolytic reaction zone and the external environment without leakage. Regarding the pressure difference between the liquid inlet and liquid outlet of the inner ring of the electrolytic diaphragm, since the outer ring of the electrolytic diaphragm is sealed, the pressure difference within the inner ring will gradually self-balance and disappear. When such electrode plates are used to construct an electrolysis unit or even a high-pressure electrolytic cell, the electrolysis unit of the high-pressure electrolytic cell can reach the required high pressure after continuous electrolysis without worrying about leakage, thereby achieving high-pressure hydrogen-to-oxygen production, that is, producing high-pressure hydrogen and oxygen. Attached Figure Description

[0014] The following description, in conjunction with the accompanying drawings, further illustrates an electrode plate with ring-shaped protrusions, an electrolysis unit, and a high-voltage electrolysis cell according to the present invention.

[0015] Figure 1 This is a schematic diagram of the sealing assembly of an electrolysis unit in an existing electrolyzer for producing high-pressure hydrogen and oxygen.

[0016] Figure 2 This is a front view of the anode plate of an electrode plate with raised strips in Embodiment 1.

[0017] Figure 3 This is a front view of a negative electrode plate with a raised strip in Embodiment 1.

[0018] Figure 4 yes Figure 2 Top view.

[0019] Figure 5 Figure 3 Top view.

[0020] Figure 6 yes Figure 4 A magnified view of the area within the circle marked "I".

[0021] Figure 7 yes Figure 6 A diagram showing the process of removing the O-ring.

[0022] Figure 8 This is a top cross-sectional view of an electrolysis unit in Example 2.

[0023] Figure 9 yes Figure 8 A magnified view of the area within the circle marked K.

[0024] Figure 10 This is a schematic diagram of a high-voltage electrolytic cell in Example 3. Implementation Example 1

[0025] This embodiment provides an electrode plate with circular protrusions for use in a high-voltage electrolytic cell. The electrode plate is divided into a positive electrode plate 1 and a negative electrode plate 2. Figure 2 and Figure 4 The image shows the anode plate 1. Figure 3 and Figure 5 The image shows the cathode plate 2. In this embodiment, both the positive and negative sides of the anode plate 1 and the cathode plate 2 have an electrolysis region 100 that participates in the electrolysis reaction. In this region 100, there is a liquid inlet 3, two liquid outlet gas holes 4-1 and 4-2, and multiple small through holes 5.

[0026] like Figure 4 , Figure 6 and Figure 7 As shown, two annular grooves, an outer annular groove 6-1 and an inner annular groove 6-2, are formed around the perimeter of the electrolysis area on both sides of the positive and negative surfaces of the anode plate 1. Two O-rings, an outer O-ring 7-1 and an inner O-ring 7-2, are filled in each of the annular grooves 6-1 and 6-2. The thickness of the O-rings 7-1 and 7-2 is greater than the depth of the annular grooves 6-1 and 6-2. The O-rings 7-1 and 7-2 constitute the raised strips on the electrode plate.

[0027] Obviously, this embodiment can also be modified by opening annular grooves 6-1 and 6-2 on both sides of the negative electrode plate 2 and filling them with O-rings 7-1 and 7-2. Example 2

[0028] This embodiment provides an electrolysis unit, such as Figure 8 and Figure 9 As shown, the electrolytic separator 8 is formed by clamping the cathode plate 2 and anode plate 1 with the annular protrusions in the electrode plate of Example 1 together. The electrolytic separator 8 is attached to the opposite sides of the cathode plate 2 and anode plate 1 and covers the electrolytic area 100. The electrolytic separator 8 has openings corresponding to one liquid inlet and two liquid outlet gas outlets. The outer O-ring 7-1 on the side of the anode plate 1 after being joined forms a first ring seal with the side of the cathode plate 2, and the inner O-ring 7-2 on the side of the anode plate after being joined forms a second ring seal with the side of the electrolytic separator 8. That is, the outer protrusion on the side of the anode or cathode plate after being joined forms a first ring seal with the side of the cathode or anode plate, and the inner protrusion on the side of the anode or cathode plate after being joined forms a second ring seal with the side of the electrolytic separator.

[0029] Obviously, or when Embodiment 1 is modified to open annular grooves 6-1 and 6-2 on both sides of the cathode plate 2 and fill them with O-rings 7-1 and 7-2, then the outer O-ring 7-1 on the side of the cathode plate 2 forms a first ring seal with the side of the anode plate 1, and the inner O-ring 7-2 on the side of the cathode plate 2 forms a second ring seal with the side of the electrolytic diaphragm 8. Example 3

[0030] This embodiment provides a high-voltage electrolytic cell, such as Figure 10 As shown, it is composed of multiple electrolysis units of Embodiment 2 stacked and pressed together. The liquid inlet 2 and the corresponding opening 20 on the electrolysis diaphragm 8 are used for the electrolyte to enter and fill the electrolysis areas 100 on both sides of the electrode plate. The two liquid outlet vents 3-1 and 3-2 and the corresponding openings 10-1 and 10-2 on the electrolysis diaphragm 8 are used to export the gas and liquid after the electrolysis reaction on the cathode side and the anode side respectively. Example 4

[0031] In embodiments one to three above, the annular protrusions on the electrode plate formed by the inner and outer O-rings 7-1 and 7-2 can also be modified as follows: 1) The raised strip is an adhesive strip that is glued to the side of the electrode plate (cathode plate 2 or anode plate 1); 2) The raised strip is a coating formed on the side of the electrode plate (cathode plate 2 or anode plate 1), such as a ceramic coating; 3) The raised strip is integrally made with the electrode plate (cathode plate 2 or anode plate 1), that is, the raised strip is part of the same material as the electrode plate; 4) The cross-sectional shape of the convex strip is trapezoidal, triangular, quadrilateral or prismatic, etc.

[0032] In the above embodiment, the electrode plate 1 is circular, but this does not mean that a circle is the only possible shape for the electrode plate. The electrode plate 1 can also be square, rhomboid, elliptical, or polygonal, or other shapes. Similarly, the annular protrusions and annular grooves can be circular, square, or other annular shapes.

[0033] In addition, other prior art related to the electrode plates, electrolysis units and electrolytic cells involved in the above embodiments can be found in the Chinese patents or similar publications mentioned in the background art, and will not be repeated in this invention.

[0034] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. An electrolysis unit, comprising electrode plates with annular protrusions serving as cathode and anode plates respectively, sandwiched together with an electrolysis diaphragm and then pressed tightly together, wherein the electrode plates with annular protrusions are used in a high-voltage electrolysis cell, and the electrode plates have an electrolysis region participating in the electrolysis reaction in the middle of their front and back sides, and a liquid inlet, two liquid outlet gas outlets, and multiple small through holes are formed in this region, wherein the electrode plates are divided into anode plates and cathode plates; characterized in that: Two concentric rings of raised strips are formed around the edge of the electrolysis area on both sides of the anode or cathode plate, namely an inner ring raised strip and an outer ring raised strip; the electrolysis diaphragm covers the electrolysis area, and the electrolysis diaphragm has openings corresponding to the liquid inlet and liquid outlet holes respectively; the outer ring raised strip on the side of the anode plate after being joined forms a first ring of line seal with the side of the cathode plate or the outer ring raised strip on the side of the cathode plate and the side of the anode plate after being joined, and the inner ring raised strip on the side of the anode plate after being joined forms a second ring of line seal with the side of the electrolysis diaphragm or the inner ring raised strip on the side of the cathode plate and the side of the electrolysis diaphragm.

2. A high-voltage electrolytic cell, characterized in that: The electrolysis unit described in claim 1 is stacked and pressed together. The inlet hole and its corresponding opening are used for the electrolyte to enter and fill the electrolysis areas on both sides of the electrode plate. The two outlet gas holes and their corresponding openings are used to export the gas and liquid after the electrolysis reaction on the cathode side and the anode side, respectively.

3. The electrolysis unit according to claim 1 or the high-voltage electrolysis cell according to claim 2, characterized in that: On both sides of the positive or negative electrode plate, there are two annular grooves, an inner annular groove and an outer annular groove, around the edge of the electrolysis area. The inner and outer protrusions are respectively the inner and outer O-rings filled in the inner and outer annular grooves. The thickness of the O-ring is greater than the depth of the annular groove.

4. The electrolysis unit according to claim 1 or the high-voltage electrolysis cell according to claim 2, characterized in that: The raised strips are two rings of adhesive strips glued to the side of the electrode plate.

5. The electrolysis unit according to claim 1 or the high-voltage electrolysis cell according to claim 2, characterized in that: The raised strips are two rings of plating formed on the side of the electrode plate.

6. The electrolysis unit according to claim 1 or the high-voltage electrolysis cell according to claim 2, characterized in that: The convex strip is integrally formed with the electrode plate.

7. The electrolysis unit according to claim 1 or the high-voltage electrolysis cell according to claim 2, characterized in that: The cross-sectional shape of the protrusion is trapezoidal, triangular, quadrilateral, or prismatic.

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