Bipolar plate assembly, electrolysis cell and electrolytic bath

Abstract

The invention discloses a bipolar plate assembly, an electrolysis cell and an electrolytic bath, and is applied to the technical field of electrolytic baths. The bipolar plate assembly comprises a bipolar plate and a first sealing piece, the first sealing piece comprises a first sealing frame and a first sealing ring, the first sealing frame is located on one side of the bipolar plate, the first sealing frame is provided with a first surface and a second surface which are opposite, the first surface is arranged towards the bipolar plate, and the second surface is arranged towards the second surface. The first sealing frame penetrates through the first surface and the second surface and is provided with a first through hole, the first sealing ring is installed on the inner wall of the first through hole, and the first sealing ring protrudes relative to the first surface and the second surface. When the bipolar plate and the first sealing frame are assembled, the first sealing ring is extruded to be flush with the first surface, and when the bipolar plate assembly and the membrane electrode are assembled, the first sealing ring is extruded to be flush with the second surface. Therefore, the stability of sealing interface pressure can be improved, and the sealing effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytic cells, and in particular to a bipolar plate assembly, an electrolytic chamber, and an electrolytic cell. Background Art

[0002] An electrolyzer is a device that converts electrical energy into chemical energy based on electrochemistry. By energizing the device, water is electrolyzed into hydrogen and oxygen, converting electrical energy into chemical energy stored in the hydrogen, thus achieving energy conversion. Electrolyzers typically use solid-state electrolytes (proton exchange membranes or anion exchange membranes) to achieve a "zero gap" design within the electrolyzer, greatly reducing the contact resistance of the electrolyzer, improving operating efficiency, and ensuring high-voltage operation. The higher the output pressure of the electrolyzer, the more conducive it is to reducing the subsequent hydrogen compression energy consumption. However, current electrolyzers mostly use a multi-layer electrolysis chamber stacked layer by layer. The electrolysis chamber includes a membrane electrode, an anode bipolar plate, and a cathode bipolar plate. The membrane electrode and the anode bipolar plate and cathode bipolar plate are usually sealed with a plastic frame and PTFE (Polytetrafluoroethylene) or silicone rubber gasket. Since the stress relaxation of the sealing material becomes more obvious under long-term extrusion, the sealing material will undergo inertial deformation, resulting in a decrease in the sealing interface pressure, causing seal failure, local leakage, and gaskets being blown out by gas. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a bipolar plate assembly, an electrolysis chamber, and an electrolysis cell that can improve the stability of the sealing interface pressure and enhance the sealing effect.

[0004] According to the first embodiment of the present application, a bipolar plate assembly includes:

[0005] Bipolar plates;

[0006] The first seal includes a first sealing frame and a first sealing ring. The first sealing frame is located on one side of the bipolar plate. The first sealing frame has a first surface and a second surface relative to each other. The first surface is arranged toward the bipolar plate. The first sealing frame is provided with a first through hole passing through the first surface and the second surface. The first sealing ring is installed on the inner wall of the first through hole. The first sealing ring is raised relative to the first surface and the second surface. When the bipolar plate is assembled with the first sealing frame, the first sealing ring is squeezed to be flush with the first surface. When the bipolar plate assembly is assembled with the membrane electrode, the first sealing ring is squeezed to be flush with the second surface.

[0007] According to the bipolar plate assembly of the embodiment of the present application, at least the following beneficial effects are achieved: by providing a first sealing member including a first sealing frame and a first sealing ring, the first sealing frame is mounted on one side of the bipolar plate, the first sealing ring is mounted on the inner wall of the first through hole of the first sealing frame, and the first sealing ring is raised relative to the two side surfaces of the first sealing frame. When the bipolar plate and the first sealing frame are assembled, the first sealing ring is pressed until it is flush with the first surface of the first sealing frame. When the bipolar plate assembly is assembled with the membrane electrode, the first sealing ring is pressed until it is flush with the second surface of the first sealing frame. Afterwards, the overpressure generated by the assembly is borne by the first sealing frame, so that the pressure on the first sealing ring can be considered constant, and the stress relaxation caused by creep of the first sealing ring due to long-term pressure can be ignored. In this way, by applying a press force on both sides of the first sealing frame, the first sealing ring is flattened until it is flush with the surface of the first sealing frame, forming a complete and tight sealing surface. At the same time, the first sealing frame shares the overpressure during assembly, which can help protect the first sealing ring, reduce the stress relaxation of the first sealing ring, and improve the pressure stability of the sealing interface, thereby improving the sealing effect.

[0008] According to some embodiments of the present application, the bipolar plate includes a main body area and a frame area, the frame area is located at the periphery of the main body area, the main body area is raised relative to the frame area to form a first height, and the first sealing ring is arranged around the periphery of the main body area.

[0009] According to some embodiments of the present application, the first height is the same as the thickness of the first sealing frame.

[0010] According to some embodiments of the present application, the main body area includes a flow channel area and a distribution area, and the bipolar plate assembly further includes a first cover plate, which is arranged to cover the distribution area and is located within the first sealing ring.

[0011] According to some embodiments of the present application, the bipolar plate includes an anode side and a cathode side, the number of the first seals is two, and the two first seals include an anode seal and a cathode seal, the anode seal is arranged on the anode side, and the cathode seal is arranged on the cathode side.

[0012] According to some embodiments of the present application, the first sealing ring is a lip-shaped sealing ring, and / or the first sealing ring and the first sealing frame are vulcanized.

[0013] According to some embodiments of the present application, the material of the first sealing ring is fluororubber or EPDM rubber, and / or the material of the first sealing frame is any one of stainless steel, titanium or nickel.

[0014] According to some embodiments of the present application, the first sealing frame is connected to the bipolar plate via threaded fasteners.

[0015] According to the second embodiment of the present application, the electrolysis chamber includes a membrane electrode, an anode bipolar plate assembly and a cathode bipolar plate assembly. The anode bipolar plate assembly and the cathode bipolar plate assembly are the bipolar plate assemblies described in the first aspect above.

[0016] The electrolysis chamber according to the embodiment of the present application has at least the following beneficial effects: it can improve the stability of the sealing interface pressure and improve the sealing effect.

[0017] According to the third embodiment of the present application, the electrolytic cell includes an anode end plate, a cathode end plate, and the electrolysis chamber as described in the second aspect above, and the electrolysis chamber is arranged between the anode end plate and the cathode end plate.

[0018] The electrolytic cell according to the embodiment of the present application has at least the following beneficial effects: it can improve the stability of the sealing interface pressure and improve the sealing effect.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 A schematic structural diagram of the electrolysis chamber disclosed in an embodiment of the present application from one viewing angle;

[0022] Figure 2 This is a schematic structural diagram of the electrolysis chamber disclosed in an embodiment of the present application from another perspective;

[0023] Figure 3 This is a disassembled schematic diagram of the electrolysis chamber disclosed in the embodiment of the present application;

[0024] Figure 4 A schematic structural diagram of a bipolar plate assembly disclosed in an embodiment of the present application from one perspective;

[0025] Figure 5 This is a schematic structural diagram of the bipolar plate assembly disclosed in an embodiment of the present application from another perspective;

[0026] Figure 6 This is a disassembled schematic diagram of the bipolar plate assembly disclosed in the embodiment of the present application;

[0027] Figure 7 This is a schematic structural diagram of the first sealing member disclosed in an embodiment of the present application;

[0028] Figure 8 This is a schematic structural diagram of the anode side of the bipolar plate disclosed in the embodiment of the present application;

[0029] Figure 9 This is a schematic structural diagram of the cathode side of the bipolar plate disclosed in an embodiment of the present application.

[0030] Reference numerals:

[0031] 2. Electrolysis chamber; 21. Membrane electrode; 22. Anode bipolar plate assembly; 23. Cathode bipolar plate assembly; 24. Anode diffusion membrane; 25. Cathode diffusion membrane; 1. Bipolar plate assembly; 11. Bipolar plate; 111. Main body area; 112. Frame area; 12. First sealing member; 121. First sealing frame; 122. First sealing ring; 123. Second sealing ring; 124. Third sealing ring; 13. First cover plate. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0033] In the description of this application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of this application, unless otherwise specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; they can refer to mechanical or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] In the description of this application, if the reference terms "as an embodiment", "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", "some examples", etc. appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0037] Electrolyzers typically use solid electrolytes (proton exchange membranes or anion exchange membranes) to achieve a "zero gap" design inside the electrolyzer, greatly reducing the contact resistance of the electrolyzer, improving work efficiency, and providing a guarantee for high-voltage operation. The higher the output pressure of the electrolyzer, the more conducive it is to reducing the subsequent hydrogen compression energy consumption. In related technologies, electrolyzers mainly have the following problems:

[0038] 1. Electrolyzers are mostly constructed with multiple layers of electrolytic chambers stacked one on top of the other. In the electrolytic chambers, plastic frames and PTFE (Polytetrafluoroethylene) or silicone rubber gaskets are usually used to seal the membrane electrode and the anode and cathode bipolar plates. Due to the increasing stress relaxation of the sealing material under long-term extrusion, the sealing material undergoes inertial deformation, resulting in reduced sealing interface pressure, seal failure, and the occurrence of local leakage and gaskets being blown out by gas.

[0039] 2. Sealing performance is closely related to the compression rate of the sealing material. Due to the different properties of different materials, the required loading force is also different, which poses a considerable challenge to the design of assembly force and sealing structure design. Once overpressure occurs (loading force is too large), the sealing material will be compressed to a large extent, resulting in permanent deformation, extrusion or even crushing, which will reduce the sealing life of the sealing material. If the loading force is too small, it will lead to improper assembly and leakage problems, resulting in high assembly requirements for the electrolyzer and great difficulty in assembly.

[0040] 3. The bipolar plate adopts a flow channel structure. The bipolar plate is engraved with flow channels and sealing grooves. The grooves are sealed by sticking sealing strips in the sealing grooves. Therefore, there are high precision requirements for the flatness and roughness of the sealing grooves of the bipolar plates. Excessive errors may cause uneven force on the seals and local leakage, making the processing of bipolar plates difficult and costly.

[0041] Based on this, the present application provides a bipolar plate assembly, which arranges a first sealing ring in a first through hole of a first sealing frame. When the bipolar plate and the first sealing frame are assembled, the first sealing ring is squeezed to be flush with the surface of the first sealing frame, so that the overpressure is borne by the first sealing frame, thereby solving the problems of pressure relaxation caused by long-term pressure on the first sealing ring, difficulty and high cost in bipolar plate processing, and difficulty in assembly.

[0042] An embodiment of the present application discloses a bipolar plate assembly, which can be applied to an electrolysis chamber, and the electrolysis chamber can be applied to an electrolytic cell to improve the stability of the sealing interface pressure and enhance the sealing effect.

[0043] To facilitate understanding of the structures of the bipolar plate assembly, the electrolysis chamber, and the electrolysis cell, the bipolar plate assembly, the electrolysis chamber, and the electrolysis cell will be further described below with reference to embodiments and accompanying drawings.

[0044] The present invention provides an electrolytic cell comprising an anode terminal plate, a cathode terminal plate and an electrolysis chamber 2 (see Figure 1 ), the electrolysis chamber 2 is arranged between the anode end plate and the cathode end plate. Figures 1 to 3 The electrolysis chamber 2 includes a membrane electrode 21, an anode bipolar plate assembly 22 and a cathode bipolar plate assembly 23. The anode bipolar plate assembly 22 and the cathode bipolar plate assembly 23 are bipolar plate assemblies 1. Specifically, please combine Figures 4 to 7 The bipolar plate assembly 1 includes a bipolar plate 11 and a first seal 12. The first seal 12 includes a first sealing frame 121 and a first sealing ring 122. The first sealing frame 121 is located on one side of the bipolar plate 11. The first sealing frame 121 has a first surface and a second surface relative to each other. The first surface is arranged toward the bipolar plate 11. The first sealing frame 121 is provided with a first through hole extending through the first surface and the second surface. The first sealing ring 122 is installed on the inner wall of the first through hole. The first sealing ring 122 protrudes relative to the first surface and the second surface. When the bipolar plate 11 and the first sealing frame 121 are assembled, the first sealing ring 122 is squeezed to be flush with the first surface. When the bipolar plate assembly 1 and the membrane electrode 21 are assembled, the first sealing ring 122 is squeezed to be flush with the second surface.

[0045] The bipolar plate assembly 1, electrolysis chamber 2, and electrolytic cell provided in the embodiment of the present application are provided with a first sealing member 12 including a first sealing frame 121 and a first sealing ring 122. The first sealing ring 122 is mounted on the inner wall of the first through hole of the first sealing frame 121. The first sealing ring 122 protrudes relative to the two side surfaces of the first sealing frame 121. The first sealing frame 121 is mounted on one side of the bipolar plate 11. When the bipolar plate 11 and the first sealing frame 121 are assembled, the first sealing ring 122 is squeezed to be flush with the first surface of the first sealing frame 121. When the bipolar plate 11 and the membrane electrode 21 are assembled, the first sealing ring 122 is squeezed to be flush with the second surface of the first sealing frame 121. The overpressure generated by the subsequent assembly will be borne by the first sealing frame 121, so that the pressure on the first sealing ring 122 can be considered constant, and the stress relaxation caused by creep of the first sealing ring 122 due to long-term pressure can be ignored. In this way, by applying a pressing force on both sides of the first sealing frame 121, the first sealing ring 122 is flattened to be flush with the surface of the first sealing frame 121 to form a complete and tight sealing surface. At the same time, the first sealing frame 121 is used to share the overpressure during assembly, which can help protect the first sealing ring 122, slow down the stress relaxation of the first sealing ring 122, and improve the pressure stability of the sealing interface, thereby improving the sealing effect.

[0046] The present application adopts a combination of the first sealing frame 121 and the first sealing ring 122, which can achieve a sealing requirement of up to 30 MPa, far exceeding the current sealing requirements of domestic electrolytic cells.

[0047] In addition, since the thickness of the first sealing frame 121 limits the compression amount of the first sealing ring 122, on the one hand, it can prevent the first sealing ring 122 from exceeding the specified deformation amount, which is conducive to ensuring the reliability of the first seal 12 and avoiding the influence of overpressure on the first sealing ring 122. During assembly, it is ensured that the first sealing ring 122 is flattened relative to the surface of the first sealing frame 121, and there is no problem of underpressure. On the other hand, through the action of the first sealing frame 121, the accuracy requirements for the assembly pressure can be reduced, thereby reducing the difficulty of assembly.

[0048] Furthermore, because the first sealing ring 122 protrudes relative to the surface of the first sealing frame 121, the first sealing ring 122 is mounted on the bipolar plate 11 through the first sealing frame 121. This eliminates the need to consider the processing and design of the sealing groove on the bipolar plate 11, saving materials and reducing processing costs. Furthermore, the first sealing ring 122 provides a good seal for the bipolar plate 11, and there are no special requirements for contact between the first sealing frame 121 and the bipolar plate 11. This helps reduce the manufacturing precision requirements for the bipolar plate 11, and reduces the difficulty and cost of processing the bipolar plate 11. Furthermore, because the first sealing frame 121 is separated from the bipolar plate 11, the thickness of the substrate of the bipolar plate 11 can be further reduced, which helps reduce the processing and material costs of the bipolar plate 11.

[0049] It can be understood that when the bipolar plate 11 is assembled with the anode end plate or the cathode end plate, the first sealing ring 122 is also squeezed to be flush with the second surface, and the sealing effect is the same.

[0050] In some embodiments, the first sealing ring 122 is made of fluororubber (FKM) or EPDM. The creep relaxation rate of FKM or EPDM is much lower than that of PTFE gaskets, further improving the pressure stability of the sealing interface and enhancing the sealing effect.

[0051] Optionally, the first sealing ring 122 is a lip-shaped sealing ring. By utilizing the elastic deformation of the lip of the lip-shaped sealing ring, the lip is elastically deformed under pressure during assembly, and fits tightly against the sealing surface to achieve sealing, thereby increasing the contact stress of the sealing interface and improving sealing reliability. At the same time, the interference fit of the lip can compensate for unevenness and tiny gaps on the sealing surface, further improving the sealing effect.

[0052] It should be noted that the thickness of the lips on both sides of the first sealing ring 122 is the compression amount of the first sealing ring 122 during assembly. The compression rate is determined according to the material properties. Generally, the compression rate in high-pressure sealing is between 28% and 33%, which is not limited here.

[0053] Optionally, the first sealing ring 122 and the first sealing frame 121 are vulcanized to improve the strength and service life of the first sealing ring 122 and ensure sealing reliability.

[0054] In some embodiments, considering that bipolar plates in related technologies mostly adopt a flow channel structure, flow channels and sealing grooves are engraved on the bipolar plates, and the grooves are sealed by pasting sealing strips in the sealing grooves. Since the sealing strips are in contact with strong acid or strong alkali solutions for a long time, they are prone to corrosion failure, resulting in sealing leakage. Therefore, the sealing strips need to be replaced frequently. When replacing the sealing strips, they need to be torn off the bipolar plate and then re-pasted, making the sealing strip replacement operation complicated. As can be seen from the above, the first sealing ring 122 is installed on the bipolar plate 11 through the first sealing frame 121. Based on this, the first sealing frame 121 is connected to the bipolar plate 11 by threaded fasteners.

[0055] This makes it easier to disassemble and assemble the first sealing frame 121 and the bipolar plate 11. When the first sealing ring 122 fails due to corrosion, the first sealing member 12 can be replaced as a whole to achieve convenient replacement of the first sealing ring 122, thereby simplifying the replacement operation of the sealing material of the bipolar plate assembly 1.

[0056] In addition, the first seal 12 and the bipolar plate 11 can be assembled independently, which is beneficial to improving the production and assembly efficiency of the bipolar plate assembly 1 and reducing the maintenance time and economic cost of the first seal 12.

[0057] Optionally, the material of the first sealing frame 121 is any one or more metals such as stainless steel, titanium or nickel, so as to ensure the strength of the first sealing frame 121 to ensure the bearing capacity of the assembly overpressure, and also make the first sealing frame 121 have good corrosion resistance, avoiding the first sealing frame 121 from being corroded and damaged by the electrolyte in the electrolytic cell, which is beneficial to ensure the service life of the first sealing frame 121 and reduce the frequency of replacement of the first seal 12.

[0058] Please combine Figure 8 and Figure 9 In some embodiments, the bipolar plate 11 includes a main body region 111 and a border region 112 . The border region 112 is located at the periphery of the main body region 111 . The main body region 111 is raised relative to the border region 112 to form a first height. The first sealing ring 122 is arranged around the periphery of the main body region 111 .

[0059] In this way, by providing the protrusion in the main body area 111 , the positioning and assembly of the first sealing member 12 can be facilitated, which helps to simplify the assembly steps.

[0060] Optionally, the first height is the same as or substantially the same as the thickness of the first sealing frame 121. When the first sealing ring 122 is flattened, the first sealing frame 121 is flush with the main body region 111 of the bipolar plate 11. This, on the one hand, facilitates the positioning and assembly of the first seal 12 and the control of the press-fitting force to reduce overpressure during the assembly process, and allows the main body region 111 and the first sealing frame 121 to share the assembly overpressure, thereby improving structural stability. On the other hand, it also ensures the flatness of the bipolar plate assembly 1 and improves structural reliability.

[0061] Please refer again Figures 4 to 9 Optionally, the main body region 111 includes a flow channel region and a distribution region, and the bipolar plate assembly 1 further includes a first cover plate 13 , which is disposed on the distribution region and is located within the first sealing ring 122 .

[0062] In this way, by providing the first cover plate 13, on the one hand, the membrane electrode 21 can be protected from being squeezed into the flow channel during the assembly process, thereby improving the structural reliability of the electrolytic cell; on the other hand, the first cover plate 13 can also provide stable support for the first sealing ring 122, so that the first cover plate 13 and the first sealing frame 121 and the main body area 111 jointly limit the compression amount of the first sealing ring 122, thereby avoiding the situation where the first sealing ring 122 is excessively deformed and causes sealing failure.

[0063] It should be noted that after the first cover plate 13 is covered on the distribution area, the side surface of the first cover plate 13 away from the main body area 111 is flush with the highest surface of the main body area 111 , that is, the first cover plate 13 is flush with the distribution area and the second surface of the first sealing frame 121 .

[0064] Optionally, the first cover plate 13 is welded to the bipolar plate 11 , thereby ensuring the structural reliability of the bipolar plate assembly 1 .

[0065] It is understandable that in other embodiments, the first cover plate 13 and the bipolar plate 11 may be connected by bonding or threaded connection.

[0066] In some embodiments, considering that the electrolytic cell fixes the electrolytic chamber 2 by installing end plates on both sides of the electrolytic chamber 2, the connection between the electrolytic chamber 2 and the end plate also requires a sealing design. In addition, the electrolytic cell in some embodiments includes multiple electrolytic chambers 2, and a sealing design is required between two adjacent electrolytic chambers 2. Based on this, the bipolar plate 11 includes an anode side and a cathode side, the number of first seals 12 is two, and the two first seals 12 include a first anode seal and a first cathode seal. The number of first cover plates 13 is two, and the two first cover plates 13 include an anode cover plate and a cathode cover plate. The first anode seal and the anode cover plate are arranged on the anode side, and the first cathode seal and the cathode cover plate are arranged on the cathode side.

[0067] In this way, by simultaneously providing the first sealing members 12 on both sides of the bipolar plate 11 , both sides of the bipolar plate assembly 1 can be sealed when assembling the electrolytic cell, thereby ensuring the sealing effect of the electrolytic cell.

[0068] Optionally, considering that the main body regions 111 are respectively provided on both sides of the bipolar plate 11 and extend in different directions, the first seals 12 located on both sides of the bipolar plate 11 should be designed to have different structures to adapt to the structural design of the two sides of the bipolar plate 11. Figures 4 to 9 , taking the shape of the bipolar plate 11 as a rectangle as an example, Figure 8 As shown, the main body region 111 of the bipolar plate 11 includes an anode liquid inlet, an anode liquid inlet distribution area, an anode flow channel area, an anode liquid outlet distribution area and an anode liquid outlet arranged in sequence along the first direction y on the anode side, as shown in FIG. Figure 9 As shown, the main region 111 of the bipolar plate 11 includes a cathode liquid inlet, a cathode liquid inlet distribution area, a cathode flow channel area, a cathode liquid outlet distribution area and a cathode liquid outlet arranged in sequence along the second direction x on the cathode side, and an anode liquid inlet, an anode liquid outlet, a cathode liquid inlet and a cathode liquid outlet are arranged through the bipolar plate 11. Based on this, refer to Figure 6 The first through hole of the first anode seal extends along the first direction y, and the first through hole of the first cathode seal extends along the second direction x.

[0069] Optionally, the first seal 12 also includes a second sealing ring 123 and a third sealing ring 124. The first sealing frame 121 is provided with a second through hole and a third through hole through the first surface and the second surface. The second through hole and the third through hole are respectively spaced apart from the first through hole. The first through hole is located between the second through hole and the third through hole. The second sealing ring 123 is installed on the inner wall of the second through hole, and the third sealing ring 124 is installed on the inner wall of the third through hole. The second sealing ring 123 and the third sealing ring 124 are raised relative to the first surface and the second surface. When the bipolar plate 11 is assembled with the first sealing frame 121, the second sealing ring 123 and the third sealing ring 124 are squeezed to be flush with the first surface. When the bipolar plate assembly 1 is assembled with the membrane electrode 21 (or, when the bipolar plate assembly 1 is assembled with the anode end plate or the cathode end plate), the second sealing ring 123 and the third sealing ring 124 are squeezed to be flush with the second surface.

[0070] Please combine Figure 6 The second sealing ring 123, the first sealing ring 122 and the third sealing ring 124 of the first anode seal are sequentially arranged along the second direction x, and the second sealing ring 123, the first sealing ring 122 and the third sealing ring 124 of the second anode seal are sequentially arranged along the first direction y. Figure 3 and Figure 8 On the anode side of the bipolar plate 11, the anode liquid inlet, anode liquid inlet distribution area, anode flow channel area, anode liquid outlet distribution area, and anode liquid outlet are located within the first sealing ring 122 of the first anode seal. The cathode liquid inlet, which penetrates the anode side, is located within the second sealing ring 123 of the first anode seal. The cathode liquid outlet, which penetrates the anode side, is located within the third anode sealing ring of the first anode seal. Figure 4 and Figure 9 On the cathode side of the bipolar plate 11, the cathode liquid inlet, the cathode liquid inlet distribution area, the cathode flow channel area, the cathode liquid outlet distribution area and the cathode liquid outlet are located in the first sealing ring 122 of the first cathode seal, the position of the anode liquid inlet that passes through the cathode side is located in the second sealing ring 123 of the first cathode seal, and the position of the anode liquid outlet that passes through the cathode side is located in the third sealing ring 124 of the first cathode seal.

[0071] In this way, the main body area 111 and the frame area 112 are sealed respectively by the first sealing ring 122 , the second sealing ring 123 and the third sealing ring 124 , thereby ensuring the sealing effect of the gas and liquid inlet and outlet, improving the sealing of the reaction chamber, and preventing gas leakage.

[0072] Please refer again Figure 3In some embodiments, the electrolysis chamber 2 further includes an anode diffusion membrane 24 and a cathode diffusion membrane 25. The anode diffusion membrane 24 is located between the anode bipolar plate assembly 22 and the membrane electrode 21, and the cathode diffusion membrane 25 is located between the cathode bipolar plate assembly 23 and the membrane electrode 21. The anode diffusion membrane 24 and the cathode diffusion membrane 25 correspond to the flow channel area respectively.

[0073] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A bipolar plate assembly, characterized in that: include: Bipolar plates; The first seal includes a first sealing frame and a first sealing ring. The first sealing frame is located on one side of the bipolar plate. The first sealing frame has a first surface and a second surface relative to each other. The first surface is arranged toward the bipolar plate. The first sealing frame is provided with a first through hole passing through the first surface and the second surface. The first sealing ring is installed on the inner wall of the first through hole. The first sealing ring is raised relative to the first surface and the second surface. When the bipolar plate is assembled with the first sealing frame, the first sealing ring is squeezed to be flush with the first surface. When the bipolar plate assembly is assembled with the membrane electrode, the first sealing ring is squeezed to be flush with the second surface.

2. The bipolar plate assembly according to claim 1, wherein: The bipolar plate includes a main body region and a frame region. The frame region is located at the periphery of the main body region. The main body region is raised relative to the frame region to form a first height. The first sealing ring is arranged around the periphery of the main body region.

3. The bipolar plate assembly according to claim 2, characterized in that: The first height is the same as the thickness of the first sealing frame.

4. The bipolar plate assembly according to claim 2, wherein: The main body area includes a flow channel area and a distribution area. The bipolar plate assembly also includes a first cover plate. The first cover plate is arranged to cover the distribution area and is located in the first sealing ring.

5. The bipolar plate assembly according to claim 2, wherein: The bipolar plate includes an anode side and a cathode side. The number of the first seals is two, and the two first seals include an anode seal and a cathode seal. The anode seal is arranged on the anode side, and the cathode seal is arranged on the cathode side.

6. The bipolar plate assembly according to any one of claims 1 to 5, characterized in that: The first sealing ring is a lip-shaped sealing ring, and / or the first sealing ring and the first sealing frame are vulcanized.

7. The bipolar plate assembly according to any one of claims 1 to 5, characterized in that: The first sealing ring is made of fluororubber or EPDM rubber, and / or the first sealing frame is made of any one of stainless steel, titanium or nickel.

8. The bipolar plate assembly according to any one of claims 1 to 5, characterized in that: The first sealing frame is connected to the bipolar plate via threaded fasteners.

9. An electrolysis chamber, characterized in that: It comprises a membrane electrode, an anode bipolar plate assembly and a cathode bipolar plate assembly, wherein the anode bipolar plate assembly and the cathode bipolar plate assembly are the bipolar plate assemblies according to any one of claims 1 to 8.

10. An electrolytic cell, characterized in that: The electrolysis chamber comprises an anode end plate, a cathode end plate and the electrolysis chamber as claimed in claim 9, wherein the electrolysis chamber is arranged between the anode end plate and the cathode end plate.

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