Sealing structure of alkaline electrolytic bath

Abstract

The embodiment of the invention provides a sealing structure of an alkaline electrolytic cell. The sealing structure comprises a cathode sealing piece and an anode sealing piece, the cathode sealing piece comprises a cathode substrate, and a first placing area for placing a cathode electrode net is arranged in the central area of the first side of the cathode substrate; a first groove part is annularly formed in the first side edge area of the cathode substrate in the circumferential direction of the first side edge area, and the first protruding part is annularly arranged on the first side of the cathode substrate and located between the first placement area and the first groove part; the anode sealing piece comprises an anode substrate, and a second placing area corresponding to the first placing area is arranged on the first side of the anode substrate and used for placing an anode electrode net; the second side of the anode substrate is further provided with a second protruding part which corresponds to the first groove part and is in sealed connection with the first groove part, and a second groove part which corresponds to the first protruding part and is in sealed connection with the first protruding part. The sealing structure of the alkaline electrolytic cell disclosed by the embodiment of the invention is simple in structure, easy to assemble and better in sealing performance.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of alkaline electrolytic cells, and specifically relate to a sealing structure of an alkaline electrolytic cell. Background Art

[0002] Alkaline water electrolysis hydrogen production refers to the process of producing hydrogen by electrolysis of water in an alkaline electrolyte environment. The electrolyte is generally a KOH solution with a preset mass concentration. The main body of the electrolyzer is assembled from end pressure plates, sealing gaskets, plates, and electric plates. The function of the sealing gasket is to prevent the electrolyte solution, hydrogen, and oxygen from leaking from the electrolyzer.

[0003] In the related art, sealing gaskets are used for sealing, and sealing gaskets with specific structures need to be customized for different electrolytic cells, which is not only costly but also complicated to assemble; the assembled electrolytic cell is large in size and weight, and the gasket is easily deformed under high cell pressure. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a sealing structure for an alkaline electrolytic cell.

[0005] An embodiment of the present disclosure provides a sealing structure of an alkaline electrolytic cell, the sealing structure comprising a cathode seal and an anode seal;

[0006] The cathode seal comprises a cathode substrate, a first placement area is provided in the central area of ​​a first side of the cathode substrate, and the first placement area is used to place the cathode electrode mesh; a first groove portion is provided in the circumferential direction of the edge area of ​​the first side of the cathode substrate, and a first protrusion portion is provided in the first side of the cathode substrate and is located between the first placement area and the first groove portion;

[0007] The anode seal comprises an anode substrate, a first side of the anode substrate is provided with a second placement area corresponding to the first placement area, the second placement area is used to place the anode electrode mesh; the second side of the anode substrate is also provided with a second convex portion corresponding to and sealed with the first groove portion, and a second groove portion corresponding to and sealed with the first convex portion; wherein,

[0008] The cathode electrode network and the anode electrode network are separated, the second side of the cathode substrate is used to connect to the cathode frame plate, and the second side of the anode substrate is used to connect to the anode frame plate.

[0009] Optionally, the sealing structure further comprises a diaphragm;

[0010] The diaphragm is interposed between the cathode seal and the anode seal to seal and connect the cathode seal and the anode seal.

[0011] Optionally, the diaphragm is also used to separate the cathode electrode network and the anode electrode network; and the diaphragm is sized to cover the first placement area, the first protrusion and the first groove.

[0012] Optionally, a fitting height between the first protrusion and the second groove is greater than a fitting height between the first groove and the second protrusion.

[0013] Optionally, the first protrusion and the second groove are of the same height, both ranging from 0.7 mm to 0.9 mm; and the height of the first groove is greater than that of the second protrusion.

[0014] Optionally, the height of the first groove portion ranges from 0.45 mm to 0.55 mm, and the height of the second protrusion portion ranges from 0.35 mm to 0.44 mm.

[0015] Optionally, the cross-sectional shapes of the first groove portion, the first protrusion portion, the second protrusion portion and the second groove portion are all trapezoidal.

[0016] Optionally, the thickness of the anode substrate is consistent with the thickness of the anode electrode mesh and the cathode electrode mesh.

[0017] Optionally, the cathode seal and the anode seal are both made of polytetrafluoroethylene sheets.

[0018] Optionally, the cathode substrate is further provided with a plurality of first positioning holes penetrating through the cathode substrate in its thickness direction, for positioning and connecting with the cathode frame plate;

[0019] The anode substrate is also provided with a plurality of second positioning holes penetrating through the thickness direction thereof, for positioning and connecting with the anode frame plate.

[0020] The sealing structure of the alkaline electrolytic cell of the embodiment of the present disclosure has the advantages of being light and easy to assemble, and can omit the multi-component and multi-process assembly process, thereby improving the assembly efficiency of the electrolytic cell. In addition, the overall structure of the sealing structure has a higher sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic plan view of a cathode seal according to an embodiment of the present disclosure;

[0022] Figure 2 A schematic plan view of an anode seal according to another embodiment of the present disclosure;

[0023] Figure 3 This is a schematic diagram of an electrolytic cell assembly according to another embodiment of the present disclosure;

[0024] Figure 4It is a schematic diagram of the coordination of the first side structure between a cathode seal and an anode seal according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figures 1 to 3 As shown, a sealing structure of an alkaline electrolytic cell includes a cathode seal 110 and an anode seal 120. The cathode seal 110 includes a cathode substrate 111, and a first placement area 112 is provided in the central area of ​​the first side of the cathode substrate 111, and the first placement area 112 is used to place the cathode electrode mesh 200. A first groove portion 113 is provided along the circumference of the first side edge area of ​​the cathode substrate 111, and a first protrusion 114 is provided on the first side of the cathode substrate 111 and is located between the first placement area 112 and the first groove portion 113.

[0027] The anode seal 120 includes an anode substrate 121, and a second placement area 122 corresponding to the first placement area 112 is provided on a first side of the anode substrate 121, and the second placement area 122 is used to place the anode electrode net 300. A second protrusion 123 corresponding to and sealed with the first groove 113 and a second groove 124 corresponding to and sealed with the first protrusion 114 are also provided on a second side of the anode substrate 121. The cathode electrode net 200 and the anode electrode net 300 are separated, and the second side of the cathode substrate 111 is used to connect the cathode frame plate 400, and the second side of the anode substrate 121 is used to connect the anode frame plate 500.

[0028] Specifically, Figures 1 to 3 As shown, the first groove portion 113 and the first protrusion portion 114 on the first side of the cathode seal 110 are sealed and connected with the second protrusion portion 123 and the second groove portion 124 on the first side of the anode seal 120 respectively. The cathode seal 110 and the anode seal 120 cooperate to form a sealing structure, and both seals are integrally formed, and both seals are made of high-density polytetrafluoroethylene sheet. The first placement area 112 on the first side of the cathode seal 110 is used to carry the cathode electrode net 200, and the second placement area 122 on the first side of the anode seal 120 is used to carry the anode electrode net 300. When the cathode seal 110 and the anode seal 120 are sealed and connected, the cathode electrode net 200 is located on one side of the cathode seal 110, and the anode electrode net 300 is located on one side of the anode seal 120, and the cathode electrode net 200 and the anode electrode net 300 are separated, and the two are in a mutually isolated state.

[0029] It should be noted that the thickness of the anode substrate 120 is consistent with the thickness of the anode electrode mesh 300 and the cathode electrode mesh 200. In other words, the thickness of the anode substrate 120, the anode electrode mesh 300 and the cathode electrode mesh 200 are the same.

[0030] The second side of the cathode substrate 111 is used to connect to the cathode frame plate 400, and the second side of the anode substrate 121 is used to connect to the anode frame plate 500. Figure 3 , from bottom to top, a cathode frame plate 400, a cathode seal 110, a cathode electrode mesh 200, a diaphragm 130 (the diaphragm 130 is discussed below for details), an anode electrode mesh 300, an anode seal 120, and an anode frame plate 500 are sequentially assembled to form a single electrolysis chamber. It is not difficult to understand that the first side and the second side of the seal are opposite sides.

[0031] Further, the cathode substrate 111 is provided with a plurality of first positioning holes 115 extending through the thickness direction thereof, for positioning and connecting with the cathode frame plate 400. The first positioning holes 115 are through holes extending from the first side to the second side of the cathode substrate 111, and the first positioning holes 115 are located in the side area of ​​the cathode substrate 111. The anode substrate 121 is provided with a plurality of second positioning holes 125 extending through the thickness direction thereof, for positioning and connecting with the anode frame plate 500. The second positioning holes 125 are through holes extending from the first side to the second side of the anode substrate 121, and the second positioning holes 121 are located in the side area of ​​the anode substrate 121.

[0032] When a single electrolysis chamber is assembled, a pressure of 5MPa can be applied to seal it, and then alkaline electrolyte is introduced to seal the liquid. Then, an electric current is applied to it. An oxygen detector is used to detect whether there is gas leakage on the anode side, and a hydrogen detector is used to detect whether there is gas leakage on the cathode side to verify that the sealing is good.

[0033] The sealing structure of the alkaline electrolytic cell of the embodiment disclosed herein has the advantages of being light and easy to assemble, and the integrated sealing component omits the assembly of multiple components and multiple processes, thereby improving the assembly efficiency of the electrolytic cell. The sealing component is made of a high-density polytetrafluoroethylene sheet, and its overall structure has long-term creep resistance and dimensional stability compared to ordinary sealing gaskets, and will not deform in size when high pressure is applied. In addition, the overall structure of the sealing structure has higher sealing performance.

[0034] For example, Figure 3 As shown, the sealing structure further includes a diaphragm 130. The diaphragm 130 is sandwiched between the cathode seal 110 and the anode seal 120 to seal and connect the cathode seal 110 and the anode seal 120.

[0035] Specifically, Figures 1 to 3 As shown, when the first groove portion 113 and the first protrusion portion 114 on the first side of the cathode seal 110 are connected with the second protrusion portion 123 and the second groove portion 124 on the first side of the anode seal 120 , a sealed connection is achieved through the diaphragm 130 .

[0036] Furthermore, the separator 130 is also used to separate the cathode electrode network 200 and the anode electrode network 300 . And the size of the separator 130 is to cover the first placement area 112 , the first protrusion 114 and the first groove 113 .

[0037] Specifically, Figures 1 to 3 As shown, the cathode electrode net 200 and the anode electrode net 300 are separated, and the isolation between the two is achieved by the diaphragm 130. In addition, the size of the diaphragm 130 is such that it can cover the first placement area 112, the first groove portion 113, and the first protrusion portion 114 on the first side of the cathode seal 110, and the second placement area 122, the second protrusion portion 123, and the second groove portion 124 on the first side of the anode seal 120. Thus, the cathode seal and the anode seal are sealed and connected.

[0038] For example, Figures 1 to 4 As shown, the fitting height of the first protrusion 114 and the second groove 124 is greater than the fitting height of the first groove 113 and the second protrusion 123 .

[0039] Specifically, Figure 3 and Figure 4 As shown, the fitting height between the first protrusion 114 and the second groove 124 is greater than the fitting height between the first groove 113 and the second protrusion 123. This arrangement can form a certain thickness difference, and can be double-sealed to prevent the alkali solution and generated gas flowing in the first placement area 112 and the second placement area 122 from leaking.

[0040] Furthermore, the first protrusion 114 and the second groove 124 have the same height, and both of their heights are in the range of 0.7 mm to 0.9 mm. The height of the first groove 113 is greater than the height of the second protrusion 123 .

[0041] Specifically, the protrusion height of the first protrusion 114 is the same as the depression height of the second groove 124, and the height range of the two can be set at 0.7mm to 0.9mm. As an example, the protrusion height of the first protrusion 114 and the depression height of the second groove 124 are both set to 0.8mm. The depression height of the first groove 113 is set to be greater than the protrusion height of the second protrusion 123, and a distance gap is left between the two.

[0042] Furthermore, the height of the first groove 113 ranges from 0.45 mm to 0.55 mm, and the height of the second protrusion 123 ranges from 0.35 mm to 0.44 mm. As a specific example, the first groove 113 may have a concave height of 0.5 mm, and the second protrusion 123 may have a protruding height of 0.4 mm.

[0043] The sealing structure of the alkaline electrolytic cell of the embodiment of the present disclosure has a double-layer mortise and tenon structure with a thickness difference (ie, a first groove portion and a second protrusion portion, a first protrusion portion and a second groove portion) and has higher sealing performance.

[0044] For example, Figure 3 and Figure 4 As shown, the cross-sectional shapes of the first groove portion 113 , the first protrusion portion 114 , the second protrusion portion 124 , and the second groove portion 123 are all trapezoidal.

[0045] Specifically, Figure 3 and Figure 4 As shown, the cross-sectional shapes of the first groove portion 113 and the second protrusion portion 124 are mutually matched trapezoids. The cross-sectional shapes of the second groove portion 123 and the first protrusion portion 114 are mutually matched trapezoids. The trapezoidal structure facilitates assembly between the sealing components and has a good sealing effect.

[0046] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A sealing structure for an alkaline electrolytic cell, characterized in that: The sealing structure includes a cathode seal and an anode seal; The cathode seal comprises a cathode substrate, a first placement area is provided in the central area of ​​a first side of the cathode substrate, and the first placement area is used to place the cathode electrode mesh; a first groove portion is provided in the circumferential direction of the edge area of ​​the first side of the cathode substrate, and a first protrusion portion is provided in the first side of the cathode substrate and is located between the first placement area and the first groove portion; The anode seal comprises an anode substrate, a first side of the anode substrate is provided with a second placement area corresponding to the first placement area, the second placement area is used to place the anode electrode mesh; the second side of the anode substrate is also provided with a second convex portion corresponding to and sealed with the first groove portion, and a second groove portion corresponding to and sealed with the first convex portion; wherein, The cathode electrode network and the anode electrode network are separated, the second side of the cathode substrate is used to connect to the cathode frame plate, and the second side of the anode substrate is used to connect to the anode frame plate.

2. The sealing structure of the alkaline electrolytic cell according to claim 1, characterized in that: The sealing structure also includes a diaphragm; The diaphragm is interposed between the cathode seal and the anode seal to seal and connect the cathode seal and the anode seal.

3. The sealing structure of the alkaline electrolytic cell according to claim 2, characterized in that: The diaphragm is also used to separate the cathode electrode network and the anode electrode network; and the diaphragm has a size covering the first placement area, the first protrusion and the first groove.

4. The sealing structure of the alkaline electrolytic cell according to any one of claims 1 to 3, characterized in that: A fitting height between the first protrusion and the second groove is greater than a fitting height between the first groove and the second protrusion.

5. The sealing structure of the alkaline electrolytic cell according to claim 4, characterized in that: The first protrusion and the second groove have the same height, both ranging from 0.7 mm to 0.9 mm; the height of the first groove is greater than the height of the second protrusion.

6. The sealing structure of the alkaline electrolytic cell according to claim 5, characterized in that: The height of the first groove portion ranges from 0.45 mm to 0.55 mm, and the height of the second protrusion portion ranges from 0.35 mm to 0.44 mm.

7. The sealing structure of the alkaline electrolytic cell according to any one of claims 1 to 3, characterized in that: The cross-sectional shapes of the first groove portion, the first protrusion portion, the second protrusion portion, and the second groove portion are all trapezoidal.

8. The sealing structure of the alkaline electrolytic cell according to any one of claims 1 to 3, characterized in that: The thickness of the anode substrate is consistent with the thickness of the anode electrode mesh and the cathode electrode mesh.

9. The sealing structure of the alkaline electrolytic cell according to any one of claims 1 to 3, characterized in that: The cathode seal and the anode seal are both made of polytetrafluoroethylene sheets.

10. The sealing structure of the alkaline electrolytic cell according to any one of claims 1 to 3, characterized in that: The cathode substrate is also provided with a plurality of first positioning holes penetrating the cathode substrate in its thickness direction for positioning and connecting with the cathode frame plate; The anode substrate is also provided with a plurality of second positioning holes penetrating through the thickness direction thereof, for positioning and connecting with the anode frame plate.

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