A sealed frame and electrolytic cell

Abstract

The utility model provides a kind of sealing frame, be equipped with electrode installation groove, and with the liquid inlet and liquid outlet being communicated with electrode installation groove, first flow channel is equipped between liquid inlet and electrode installation groove, from liquid inlet to electrode installation groove, the cross section of first flow channel gradually increases, i.e. First flow channel is provided with first reinforcing rib, and the first reinforcing rib is used to guide the flow of electrolyte in the first flow channel. The first reinforcing rib can disperse the electrolyte to facilitate the electrolyte to evenly cover the surface of the electrode plate when passing through the sealing frame, providing sufficient reactants for the electrolysis reaction, while avoiding the problem of uneven reaction caused by poor local electrolyte flow.

Description

Technical Field

[0001] This utility model belongs to the technical field of sealing frames for electrolytic cells, and particularly relates to a sealing frame and an electrolytic cell. Background Technology

[0002] In existing alkaline water electrolysis hydrogen production technology, the electrolyzer, as the main equipment of the water electrolysis hydrogen production system, is composed of electrolysis chambers connected in series and parallel. The electrolysis chamber in the relevant technology consists of a sealing frame, electrode plates, diaphragm, etc. The sealing frame plays the role of sealing and guiding the electrolyte. However, in the relevant technology, after the electrolyte flows through the channel of the sealing frame, it cannot evenly cover the surface of the electrode plates, resulting in insufficient electrolysis reaction and uneven reaction. Utility Model Content

[0003] The technical objective of this invention is to provide a sealing frame that solves the problem that the electrolyte cannot evenly cover the surface of the electrode plate after passing through the flow channel of the sealing frame, resulting in insufficient electrolysis and uneven reaction.

[0004] To solve the above-mentioned technical problems, in a first aspect, this utility model provides a sealing frame applied to an electrolytic cell. The sealing frame is provided with an electrode mounting groove, and an inlet and an outlet connected to the electrode mounting groove. A first flow channel is provided between the inlet and the electrode mounting groove, and the cross-section of the first flow channel gradually increases from the inlet to the electrode mounting groove. A second flow channel is provided between the outlet and the electrode mounting groove, and the cross-section of the second flow channel gradually decreases from the electrode mounting groove to the outlet.

[0005] The first flow channel is provided with a first reinforcing rib, which is used to guide the flow of electrolyte in the first flow channel;

[0006] The second flow channel is provided with a second reinforcing rib, which is used to guide the flow of electrolyte in the second flow channel.

[0007] Further, the first reinforcing rib is at least one of cylindrical or elongated shape. When the first reinforcing rib is elongated, it extends along the direction from the liquid inlet to the electrode mounting groove, and its cross-section is circular, square, or triangular; and / or

[0008] The second reinforcing rib is at least one of cylindrical or elongated shape. When the second reinforcing rib is elongated, it extends along the direction from the liquid inlet to the electrode mounting groove, and the cross-section of the second reinforcing rib is circular, square, or triangular.

[0009] Furthermore, the height of the first reinforcing rib and the second reinforcing rib is 0.5-5mm;

[0010] The first included angle formed between the channel wall of the first flow channel and the groove wall of the electrode mounting groove is 120°-180°;

[0011] The second included angle formed between the channel wall of the second flow channel and the groove wall of the electrode mounting groove is 170°-210°.

[0012] Furthermore, the sealing frame is made of a non-metallic material.

[0013] Furthermore, the sealing frame material includes one or a combination of several of polyphenylene sulfone (PPSU), polyether ether ketone (PEEK), polyvinylidene fluoride (PVDF), and polyphenylene sulfide (PPS);

[0014] The thickness of the sealing frame is 3-5mm.

[0015] Furthermore, the sealing frame is provided with a plurality of connection holes, which are evenly arranged around the edge of the sealing frame;

[0016] The sealing frame is provided with a first sealing line, which is arranged around the edge of the sealing frame, and the plurality of connecting holes are located inside the first sealing line;

[0017] The sealing frame is provided with a second sealing line, which is provided along part of the edge of the liquid inlet and part of the edge of the liquid outlet, and surrounds the liquid inlet and the liquid outlet within the second sealing line;

[0018] The sealing frame is provided with a third sealing line, which is arranged around the edge of the electrode mounting groove.

[0019] Furthermore, a mounting boss is provided on the inner circumferential side of the electrode mounting groove.

[0020] Secondly, this utility model provides an electrolytic cell, which includes at least two electrode units stacked and connected in sequence, two end plates and a plurality of fasteners. The two end plates are disposed at both ends of the at least two electrode units, and the fasteners fix the electrode units to the end plates. The electrode unit includes a sealing frame and an electrode plate as described in any of the above, the electrode plate is installed in the electrode mounting groove of the sealing frame, and a diaphragm is provided between two adjacent electrode units, forming an electrolytic chamber between two adjacent electrode units.

[0021] Furthermore, the electrode plate abuts against the mounting boss of the sealing frame, and an electrode plate gasket is provided between the electrode plate and the mounting boss, and the gap between the electrode plate and the mounting boss is sealed by sealant.

[0022] A cover plate is provided between the diaphragm and the sealing frame, and a diaphragm gasket is provided on the outer periphery of the diaphragm, with the diaphragm gasket abutting against two adjacent sealing frames respectively.

[0023] Furthermore, the liquid inlet of the sealing frame includes two hydrogen-side liquid inlets and two oxygen-side liquid inlets, and the liquid outlet of the sealing frame includes two hydrogen-side liquid outlets and two oxygen-side liquid outlets.

[0024] This utility model discloses a sealing frame, comprising an electrode mounting groove, an inlet, and an outlet connected to the electrode mounting groove. A first flow channel is provided between the inlet and the electrode mounting groove, with the cross-section of the first flow channel gradually increasing from the inlet to the electrode mounting groove, i.e., the first flow channel is radial along the direction of electrolyte flow, facilitating the dispersion and flow of the electrolyte. A second flow channel is provided between the outlet and the electrode mounting groove, with the cross-section of the second flow channel gradually decreasing from the electrode mounting groove to the outlet. The first flow channel has a first reinforcing rib to guide the flow of electrolyte in the first flow channel. The second flow channel has a second reinforcing rib to guide the flow of electrolyte in the second flow channel. The first reinforcing rib disperses the electrolyte, ensuring that the electrolyte evenly covers the surface of the electrode plate when passing through the sealing frame, providing sufficient reactants for the electrolysis reaction, while avoiding the problem of uneven reaction caused by poor local electrolyte flow. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the sealing frame in an embodiment of this utility model;

[0026] Figure 2 This is a simplified structural diagram of the first sealing line of the sealing frame in an embodiment of this utility model;

[0027] Figure 3 This is a simplified structural diagram of the second sealing line of the sealing frame in an embodiment of this utility model;

[0028] Figure 4 This is a simplified structural diagram of the third sealing line of the sealing frame in an embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the overall structure of the electrode unit in an embodiment of this utility model;

[0030] Figure 6 yes Figure 5 Cross-sectional view along line AA;

[0031] Figure 7 This is a cross-sectional view of the electrolytic cell in an embodiment of this utility model.

[0032] In the accompanying drawings, the reference numerals represent: 1. Sealing frame; 11. Electrode mounting groove; 12. Liquid inlet; 13. Liquid outlet; 14. First flow channel; 141. First reinforcing rib; 15. Second flow channel; 151. Second reinforcing rib; 16. Connecting hole; 17. First sealing line; 18. Second sealing line; 19. Third sealing line; 20. Mounting boss; 100. Electrolytic cell; 101. Electrode unit; 1011. Electrode plate; 102. Diaphragm; 103. Electrolysis chamber; 104. Electrode plate gasket; 105. Cover plate pressure plate; 106. Diaphragm gasket. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] The electrolysis chamber in the related technology consists of a sealing frame, electrode plates, diaphragm, etc. The sealing frame serves to seal and guide the electrolyte. However, in the related technology, after the electrolyte flows through the channel of the sealing frame, it cannot evenly cover the surface of the electrode plates, resulting in insufficient electrolysis reaction and uneven reaction.

[0037] To address the aforementioned technical problems, this utility model proposes a sealing frame.

[0038] As attached Figure 1 The diagram shown is a schematic representation of the overall structure of the sealing frame 1 in an embodiment of this utility model. The sealing frame 1 is applied to the electrolytic cell 100, from the attached... Figure 1 As can be seen from the image, the sealing frame 1 is provided with an electrode mounting groove 11, and an inlet 12 and an outlet 13 connected to the electrode mounting groove 11. A first flow channel 14 is provided between the inlet 12 and the electrode mounting groove 11. The electrolyte entering from the inlet 12 passes through the first flow channel 14 into the electrode mounting groove 11, that is, into the electrolysis chamber 103 of the electrolysis tank 100. From the inlet 12 to the electrode mounting groove 11, the cross-section of the first flow channel 14 gradually increases, that is, along the flow direction of the electrolyte, the first flow channel 14 is radial, which facilitates the dispersion and flow of the electrolyte. The first flow channel 14 is provided with a first reinforcing rib 141, which is used to guide the flow of electrolyte in the first flow channel 14. The first reinforcing rib 141 can disperse the electrolyte so that the electrolyte can evenly cover the surface of the electrode plate 1011 when passing through the sealing frame 1, providing sufficient reactants for the electrolysis reaction, while avoiding the problem of uneven reaction caused by poor local electrolyte flow.

[0039] A second flow channel 15 is provided between the outlet 13 and the electrode mounting groove 11. The cross-section of the second flow channel 15 gradually decreases from the electrode mounting groove 11 to the outlet 13. Along the flow direction of the electrolyte, the first flow channel 14 gradually narrows, facilitating the collection of electrolyte in the electrolysis chamber 103 to the outlet 13 for outflow. The second flow channel 15 is provided with a second reinforcing rib 151, which guides the flow of electrolyte in the second flow channel 15, that is, the second reinforcing rib 151 guides the electrolyte in the electrolysis chamber 103 to flow from the second flow channel 15 to the outlet 13.

[0040] Through the above embodiments, the first flow channel 14 of the sealing frame 1 of this utility model gradually increases in cross-section from the liquid inlet 12 to the electrode mounting groove 11. That is, along the flow direction of the electrolyte, the first flow channel 14 is radial, which facilitates the dispersion and flow of the electrolyte. The first flow channel 14 is provided with a first reinforcing rib 141, which is used to guide the flow of electrolyte in the first flow channel 14. The first reinforcing rib 141 can disperse the electrolyte so that the electrolyte can evenly cover the surface of the electrode plate 1011 when passing through the sealing frame 1, providing sufficient reactants for the electrolysis reaction, while avoiding the problem of uneven reaction caused by poor local electrolyte flow.

[0041] As attached Figure 1As shown, in some embodiments, the first reinforcing rib 141 is at least one of cylindrical or elongated shape. When the first reinforcing rib 141 is elongated, it extends along the direction from the liquid inlet 12 to the electrode mounting groove 11, and its cross-section is circular, square, or triangular. The cylindrical first reinforcing rib 141 can disperse the flow of electrolyte in the first flow channel 14, allowing the electrolyte to spread and flow into the electrolysis chamber 103. The axial direction of the cylinder is perpendicular to the flow direction of the electrolyte, causing the electrolyte to collide with the cylindrical first reinforcing rib 141 during flow, thereby spreading the electrolyte. The elongated first reinforcing rib 141 facilitates the dispersion of electrolyte in the first flow channel 14 through drainage, allowing the electrolyte to uniformly cover the electrode plate 1011 in the electrolysis chamber 103. The cross-section of the elongated first reinforcing rib 141 can be circular, square, or triangular, and this cross-section shape of the first reinforcing rib 141 can achieve a better drainage effect. For example, some of the first reinforcing ribs 141 in the first flow channel 14 are cylindrical, and some of the first reinforcing ribs 141 are elongated.

[0042] Similarly, the second reinforcing rib 151 is at least one of cylindrical or elongated shape. When the second reinforcing rib 151 is elongated, it extends along the direction from the inlet 12 to the electrode mounting groove 11, and its cross-section is circular, square, or triangular. The elongated shape of the second reinforcing rib 151 facilitates the drainage of electrolyte in the second flow channel 15 to the outlet 13, allowing the electrolyte to be discharged from the outlet 13 in an orderly manner. The cross-section of the elongated second reinforcing rib 151 can be circular, square, or triangular, which provides a better drainage effect. For example, all the second reinforcing ribs 151 in the second flow channel 15 are elongated.

[0043] In some embodiments, the height of the first reinforcing rib 141 and the second reinforcing rib 151 is 0.5-5 mm. Within this height range, the first reinforcing rib 141 and the second reinforcing rib 151 can achieve a good drainage effect without obstructing the flow of electrolyte. The height of the first reinforcing rib 141 and the second reinforcing rib 151 is perpendicular to the flow direction of electrolyte.

[0044] As attached Figure 1 As shown, the first included angle α formed between the channel wall of the first flow channel 14 and the groove wall of the electrode mounting groove 11 is 120°-180°. The first included angle α within this range can reduce the fluid resistance of the electrolyte and facilitate the flow of the electrolyte to the electrolysis chamber 103.

[0045] Similarly, the second included angle β formed between the wall of the second flow channel 15 and the wall of the electrode mounting groove 11 is 170°-210°. The second included angle β within this range can reduce the fluid resistance of the electrolyte and facilitate the electrolyte to flow to the outlet 13.

[0046] In some embodiments, the sealing frame 1 is made of a non-metallic material. For example, the sealing frame 1 is square. In related technologies, the sealing frame 1 is typically made of metal; however, the metal sealing frame 1 presents several problems during processing. On the one hand, the bonding of the metal sealing frame 1 to the electrode plate 1011 requires welding, which is complex, costly, and prone to causing localized high-temperature deformation, affecting the stability of the electrode plate 1011. On the other hand, the metal sealing frame 1 generates a large amount of cutting fluid during flow channel processing, increasing the burden on hazardous waste disposal. A non-metallic sealing frame 1 can solve both of these problems.

[0047] In some embodiments, the sealing frame 1 is made of one or a combination of polyphenylene sulfone (PPSU), polyetheretherketone (PEEK), polyvinylidene fluoride (PVDF), and polyphenylene sulfide (PPS). PPSU, PEEK, PVDF, and PPS are high-strength non-metallic materials, resulting in a high-strength sealing frame 1. The sealing frame 1 has a thickness of 3-5 mm, which provides moderate strength, prevents bending, and minimizes material consumption. Furthermore, the sealing frame 1 made of these materials exhibits good chemical corrosion resistance and mechanical properties, enabling long-term stable operation in alkaline environments, thus extending its service life and reducing equipment maintenance costs.

[0048] As attached Figure 1-2 and attached Figure 6 As shown, in some embodiments, the sealing frame 1 is provided with multiple connection holes 16, which facilitate the connection of the sealing frame 1 to other sealing frames 1. The multiple connection holes 16 are evenly distributed around the edge of the sealing frame 1, which facilitates the even distribution of the connection points of the sealing frame 1 and makes the connection between the sealing frame 1 and other sealing frames 1 secure. The design of the connection holes 16 facilitates assembly and disassembly, and also facilitates the maintenance and replacement of the sealing frame 1 and other components, improving the convenience of operation.

[0049] As attached Figure 2 As shown, the sealing frame 1 is provided with a first sealing line 17, which is arranged around the edge of the sealing frame 1, and multiple connection holes 16 are located within the first sealing line 17. Understandably, the first sealing line 17 is annular, and the first sealing line 17 isolates the electrolysis chamber 103 from the external environment to prevent electrolyte leakage.

[0050] As attached Figure 3As shown, the sealing frame 1 is provided with a second sealing line 18, which is set along part of the edge of the liquid inlet 12 and part of the edge of the liquid outlet 13, and surrounds the liquid inlet 12 and the liquid outlet 13 within the second sealing line 18. The second sealing line 18 isolates the electrolysis chamber 103 from the external environment, further preventing electrolyte leakage, and together with the diaphragm 102, forms separate electrolysis zones for the cathode and anode, namely the cathode / anode chambers. The electrolysis chamber 103 includes a cathode chamber and an anode chamber.

[0051] As attached Figure 4 As shown, the sealing frame 1 is provided with a third sealing line 19, which is arranged around the edge of the electrode mounting groove 11. This isolates the two small chambers of the cathode and anode on both sides of the electrode plate 1011, preventing the anode and cathode from mixing.

[0052] As attached Figure 6-7 As shown, in some embodiments, an mounting boss 20 is provided on the inner circumferential side of the electrode mounting groove 11. When the electrode plate 1011 is installed into the electrode mounting groove 11, the electrode plate 1011 abuts against the mounting boss 20, thereby stably installing the electrode plate 1011 into the electrode mounting groove 11.

[0053] As attached Figure 5-7 As shown, this utility model provides an electrolytic cell 100, which includes at least two electrode units 101 stacked and connected in sequence, two end plates (not shown in the figure), and a plurality of fasteners (not shown in the figure). The two end plates are disposed at both ends of the at least two electrode units 101, and the fasteners fix the electrode units 101 to the end plates. The electrode unit 101 includes a sealing frame 1 as described in any of the above embodiments and an electrode plate 1011. The electrode plate 1011 is installed in the electrode mounting groove 11 of the sealing frame 1, and a diaphragm 102 is provided between two adjacent electrode units 101, forming an electrolytic chamber 103 between two adjacent electrode units 101. The structure and beneficial effects of the sealing frame 1 have been described in detail in the above embodiments. Since the electrolytic cell 100 includes the sealing frame 1, the electrolytic cell 100 includes the structure and beneficial effects of the above embodiments, and will not be repeated here.

[0054] As attached Figure 6-7 As shown, in some embodiments, the electrode plate 1011 abuts against the mounting boss 20 of the sealing frame 1, and an electrode plate gasket 104 is provided between the electrode plate 1011 and the mounting boss 20. The gap between the electrode plate 1011 and the mounting boss 20 is sealed with sealant. The mounting boss 20 of the sealing frame 1 facilitates the tight bonding of the edge of the electrode plate 1011 to the sealing frame 1 with sealant, which is convenient for installation.

[0055] The sealant can be a polyimide, epoxy resin, fluororubber, or other adhesive. Specifically, the electrode plate gasket 104 tightly abuts the sealing frame 1 against the electrode plate 1011 to prevent gaps and avoid electrolyte leakage from the electrolysis chamber 103.

[0056] A cover plate 105 is provided between the diaphragm 102 and the sealing frame 1, and a diaphragm gasket 106 is provided on the outer periphery of the diaphragm 102, with the gasket 106 abutting against two adjacent sealing frames 1 respectively. The cover plate 105 facilitates the connection between the diaphragm 102 and the sealing frame 1. The cover plate 105 is bonded to the diaphragm 102 by a mold to form an assembly called a prefabricated diaphragm 102. The design of the prefabricated diaphragm 102 facilitates assembly and disassembly, and also facilitates the maintenance and replacement of the sealing frame 1 and other components, improving operational convenience.

[0057] In some embodiments, the liquid inlet 12 of the sealing frame 1 includes two hydrogen-side liquid inlets and two oxygen-side liquid inlets, and the liquid outlet 13 of the sealing frame 1 includes two hydrogen-side liquid outlets and two oxygen-side liquid outlets. During electrolysis, the electrolyte is evenly distributed to the surface of the electrode plate 1011 through the flow channel within the sealing frame 1. Under the action of the electric field, water molecules decompose on the surface of the electrode plate 1011, producing hydrogen and oxygen. Hydrogen is generated at the cathode and oxygen is generated at the anode in the electrolytic cell 100. The diaphragm 102 and the electrode plate 1011 act as a barrier, forming a hydrogen-side reaction chamber and an oxygen-side reaction chamber. Since hydrogen and oxygen cannot mix, they are discharged through different outlets.

[0058] In application, this invention first selects a suitable non-metallic sealing frame 1 based on the required hydrogen production scale and the size of the electrolyzer 100. Sealing gaskets are installed within the sealing line area. Electrodes and diaphragms 102 are placed on the sealing frame 1 in a predetermined order. Multiple sealing frames 1 and related components are assembled into an electrolyzer 100 consisting of multiple electrolysis chambers 103 using connectors through the connecting holes 16. The prepared alkaline electrolyte is injected into the electrolyzer 100, and the power is turned on to begin the alkaline water electrolysis hydrogen production process. The sealing lines include a first sealing line 17, a second sealing line 18, and a third sealing line 19. Understandably, the sealing lines are designed with a raised rib structure, with a height between 0.15 mm and 3 mm. Sealing gaskets are installed between the sealing lines. The sealing gaskets include electrode plate gaskets 104 and diaphragm gaskets 106.

[0059] During electrolysis, the electrolyte is evenly distributed to the electrode surface through the flow channels within the sealed frame 1. Under the influence of the electric field, water molecules decompose on the electrode surface, producing hydrogen and oxygen. Due to the material properties of the non-metallic sealed frame 1, the precipitation of metal ions caused by prolonged operation of metal in hot alkaline solutions is avoided, ensuring the purity and quality of the hydrogen. Simultaneously, the rational design of the flow channels ensures the uniform distribution of the electrolyte, and the sealing structure ensures the airtightness of the equipment, making the entire hydrogen production process efficient, stable, and clean.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing frame, characterized in that, The sealing frame is applied to an electrolytic cell. The sealing frame is provided with an electrode mounting groove, and an inlet and an outlet connected to the electrode mounting groove. A first flow channel is provided between the inlet and the electrode mounting groove. The cross-section of the first flow channel gradually increases from the inlet to the electrode mounting groove. A second flow channel is provided between the outlet and the electrode mounting groove. The cross-section of the second flow channel gradually decreases from the electrode mounting groove to the outlet. The first flow channel is provided with a first reinforcing rib, which is used to guide the flow of electrolyte in the first flow channel; The second flow channel is provided with a second reinforcing rib, which is used to guide the flow of electrolyte in the second flow channel.

2. The sealing frame according to claim 1, characterized in that, The first reinforcing rib is at least one of cylindrical or elongated shape. When the first reinforcing rib is elongated, it extends along the direction from the liquid inlet to the electrode mounting groove, and its cross-section is circular, square, or triangular; and / or The second reinforcing rib is at least one of cylindrical or elongated shape. When the second reinforcing rib is elongated, it extends along the direction from the liquid inlet to the electrode mounting groove, and the cross-section of the second reinforcing rib is circular, square, or triangular.

3. The sealing frame according to claim 1, characterized in that, The height of the first reinforcing rib and the second reinforcing rib is 0.5-5mm; The first included angle formed between the channel wall of the first flow channel and the groove wall of the electrode mounting groove is 120°-180°; The second included angle formed between the channel wall of the second flow channel and the groove wall of the electrode mounting groove is 170°-210°.

4. The sealing frame according to claim 1, characterized in that, The sealing frame is made of non-metallic material.

5. The sealing frame according to claim 4, characterized in that, The thickness of the sealing frame is 3-5mm.

6. The sealing frame according to claim 1, characterized in that, The sealing frame is provided with multiple connection holes, which are evenly arranged around the edge of the sealing frame. The sealing frame is provided with a first sealing line, which is arranged around the edge of the sealing frame, and the plurality of connecting holes are located inside the first sealing line; The sealing frame is provided with a second sealing line, which is provided along part of the edge of the liquid inlet and part of the edge of the liquid outlet, and surrounds the liquid inlet and the liquid outlet within the second sealing line; The sealing frame is provided with a third sealing line, which is arranged around the edge of the electrode mounting groove.

7. The sealing frame according to claim 1, characterized in that, The inner circumference of the electrode mounting groove is provided with a mounting boss.

8. An electrolytic cell, characterized in that, The electrolytic cell includes at least two electrode units stacked and connected in sequence, two end plates and a plurality of fasteners. The two end plates are disposed at both ends of the at least two electrode units. The fasteners fix the electrode units to the end plates. The electrode unit includes a sealing frame and an electrode plate as described in any one of claims 1-7. The electrode plate is installed in the electrode mounting groove of the sealing frame, and a diaphragm is provided between two adjacent electrode units, forming an electrolytic chamber between two adjacent electrode units.

9. The electrolytic cell according to claim 8, characterized in that, The electrode plate abuts against the mounting boss of the sealing frame, and an electrode plate gasket is provided between the electrode plate and the mounting boss. The gap between the electrode plate and the mounting boss is sealed by sealant. A cover plate is provided between the diaphragm and the sealing frame, and a diaphragm gasket is provided on the outer periphery of the diaphragm, with the diaphragm gasket abutting against two adjacent sealing frames respectively.

10. The electrolytic cell according to claim 8, characterized in that, The sealing frame has two hydrogen-side liquid inlets and two oxygen-side liquid inlets, and two hydrogen-side liquid outlets and two oxygen-side liquid outlets.

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