Bipolar plate assembly structure and bipolar plate

Abstract

The invention relates to the technical field of hydrogen production, and discloses a bipolar plate assembly structure, a bipolar plate, an electrolytic bath and a hydrogen production system.The bipolar plate assembly structure comprises a polar plate main body, the polar plate main body comprises a main body frame and a main body partition plate arranged in the main body frame, and an anode face and a cathode face are formed on the two side faces of the main body partition plate respectively; the anode frame is arranged on the main body frame in a stacked mode, an anode reaction area is defined by the anode frame and the anode face together, an anode fusion welding groove used for being connected with the main body frame in a fusion welding mode is formed in the anode frame, and the anode fusion welding groove is at least formed in the outer surface of the peripheral portion of the anode frame; the cathode frame is arranged on the main body frame in a stacked mode, a cathode reaction area is defined by the cathode frame and the cathode face together, a cathode fusion welding groove used for being connected with the main body frame in a fusion welding mode is formed in the cathode frame, and the cathode fusion welding groove is at least formed in the outer surface of the peripheral portion of the cathode frame. Therefore, the bipolar plate structure can be simplified, the assembling difficulty of the electrolytic cell is reduced, hydrogen leakage points are reduced, and the hydrogen production safety is improved.

Description

Technical Field

[0001] The present application belongs to the field of hydrogen production technology, and specifically relates to a bipolar plate assembly structure and a bipolar plate. Background Art

[0002] The electrolyzer is the core equipment for producing hydrogen by electrolyzing water. Traditional electrolyzers are mostly indirect electrolysis, using liquid electrolytes to enhance conductivity, while the new membrane electrolyzer uses proton exchange membranes as electrolytes, which can achieve the production of high-purity hydrogen with high efficiency. The plate is one of the core components of the membrane electrolyzer, which plays the role of conducting electrons. Several plates can divide the electrolyzer into multiple reaction chambers. Each chamber consists of an electrolytic cell with an anode plate and a cathode plate, which are used to produce oxygen and hydrogen respectively. The produced oxygen is discharged from the anode surface with the water flow, and hydrogen is discharged from the cathode surface. In order to ensure that the two fluids do not leak, the existing bipolar plates are usually composed of a multi-layer sealing structure. Therefore, a large number of parts are used, resulting in a very complicated process when assembling the electrolyzer, which is prone to assembly dislocation and increases the number of leakage points. Summary of the invention

[0003] In response to at least one of the above-mentioned defects or shortcomings of the prior art, the present application provides a bipolar plate assembly structure and a bipolar plate, which can simplify the bipolar plate structure, reduce the assembly difficulty of the electrolyzer, reduce hydrogen leakage points, and improve the safety of hydrogen production.

[0004] In order to achieve the above objectives, the present application provides a bipolar plate assembly structure, including:

[0005] The plate body comprises a main body frame and a main body separator arranged in the main body frame, wherein two side surfaces of the main body separator are respectively formed as an anode surface and a cathode surface;

[0006] an anode frame, which is stacked on the main body frame and defines an anode reaction area together with the anode surface, wherein the anode frame is provided with an anode welding groove for welding to the main body frame, and the anode welding groove is formed at least on the outer surface of the peripheral portion of the anode frame; and

[0007] The cathode frame is stacked on the main frame and defines a cathode reaction area together with the cathode surface. The cathode frame is formed with a cathode welding groove for welding to the main frame. The cathode welding groove is at least formed on the outer surface of the peripheral portion of the cathode frame.

[0008] In some embodiments, the bipolar plate assembly structure further includes water-oxygen flow holes and hydrogen flow holes arranged through the anode frame, the main frame and the cathode frame, and an anode guide groove connecting the water-oxygen flow holes and the anode reaction zone is formed on the inner surface of the anode frame, and a cathode guide groove connecting the hydrogen flow holes and the cathode reaction zone is formed on the inner surface of the cathode frame.

[0009] In some embodiments, the anode welding groove is also formed on the outer surface of the hole edge portion of the anode frame surrounding the hydrogen flow hole;

[0010] And / or, the cathode welding groove is also formed on the outer surface of the hole edge portion of the cathode frame surrounding the water-oxygen flow hole.

[0011] In some embodiments, an anode sealing groove for filling an anode sealing strip is formed on the anode frame, and the anode sealing groove is formed at least on the outer surface of the peripheral portion of the anode frame;

[0012] And / or, a cathode sealing groove for filling a cathode sealing strip is formed on the cathode frame, and the cathode sealing groove is at least formed on the outer surface of the peripheral portion of the cathode frame.

[0013] In some embodiments, the anode sealing groove is also formed on the outer surface of the hole edge of the anode frame surrounding the water and oxygen flow holes, the outer surface of the hole edge surrounding the hydrogen flow holes, and the outer surface of the peripheral edge surrounding the anode reaction area;

[0014] And / or, the cathode sealing groove is also formed on the outer surface of the cathode frame surrounding the water oxygen flow hole, the outer surface of the hole edge surrounding the hydrogen flow hole, and the outer surface of the peripheral edge surrounding the cathode reaction area.

[0015] A second aspect of the present application provides a bipolar plate, comprising:

[0016] The plate body comprises a main body frame and a main body separator arranged in the main body frame, wherein two side surfaces of the main body separator are respectively formed as an anode surface and a cathode surface;

[0017] an anode frame, which is stacked on the main body frame and defines an anode reaction area together with the anode surface, wherein the anode frame is provided with an anode welding portion which is welded to the main body frame, and the anode welding portion is formed by welding an anode welding groove formed at least on the outer surface of the peripheral portion of the anode frame; and

[0018] The cathode frame is stacked on the main frame and defines a cathode reaction area together with the cathode surface. The cathode frame is formed with a cathode welding portion that is welded to the main frame. The cathode welding portion is formed by welding a cathode welding groove formed at least on the outer surface of the peripheral portion of the cathode frame.

[0019] In some embodiments, the bipolar plate further comprises water-oxygen flow holes and hydrogen flow holes which are arranged through the anode frame, the main frame and the cathode frame, and an anode guide groove which connects the water-oxygen flow holes and the anode reaction zone is formed on the inner surface of the anode frame, and a cathode guide groove which connects the hydrogen flow holes and the cathode reaction zone is formed on the inner surface of the cathode frame.

[0020] In some embodiments, the anode fusion welding portion is also formed on the outer surface of the hole edge portion of the anode frame surrounding the hydrogen flow hole;

[0021] And / or, the cathode fusion welding portion is also formed on the outer surface of the hole edge portion of the cathode frame surrounding the water-oxygen flow hole.

[0022] In some embodiments, the anode frame is further formed with an anode sealing groove, the anode sealing groove is formed at least on the outer surface of the peripheral portion of the anode frame, and the bipolar plate further comprises an anode sealing strip filled in the anode sealing groove and used for bonding the membrane electrode;

[0023] And / or, a cathode sealing groove is formed on the cathode frame, and the cathode sealing groove is formed at least on the outer surface of the peripheral portion of the cathode frame. The bipolar plate also includes a cathode sealing strip filled in the cathode sealing groove and used for bonding the membrane electrode.

[0024] In some embodiments, the anode sealing groove is also formed on the outer surface of the hole edge of the anode frame surrounding the water and oxygen flow holes, the outer surface of the hole edge surrounding the hydrogen flow holes, and the outer surface of the peripheral edge surrounding the anode reaction area;

[0025] And / or, the cathode sealing groove is also formed on the outer surface of the cathode frame surrounding the water oxygen flow hole, the outer surface of the hole edge surrounding the hydrogen flow hole, and the outer surface of the peripheral edge surrounding the cathode reaction area.

[0026] Through the above technical scheme, the bipolar plate assembly structure of the present application can add an anode frame and a cathode frame on both sides of the plate body, and combine the plate body, the anode frame and the cathode frame into one by fusion welding technology such as laser welding to form a bipolar plate with an anode reaction area and a cathode reaction area. The key is that the plate body, the anode frame and the cathode frame can be formed into structural parts with the same outer contour size, so that it is easy to ensure the connection accuracy of the anode frame and the cathode frame through a clamp, and achieve reliable sealing between the pole frame and the main board. Compared with the existing technology, it can greatly reduce the use of sealing parts, simplify the structure of the bipolar plate, thereby reducing the difficulty of assembling the electrolyzer, thereby reducing the risk of hydrogen leakage and improving safety performance.

[0027] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0029] Figure 1 An exploded view of a bipolar plate assembly structure in a specific embodiment of the present application;

[0030] Figure 2 for Figure 1 A schematic diagram of the anode side when the bipolar plate assembly structure is combined into a bipolar plate;

[0031] Figure 3 for Figure 2 A partial enlargement of the bipolar plate assembly structure Figure Ⅰ ;

[0032] Figure 4 for Figure 1 A schematic diagram of the cathode side of the bipolar plate assembly structure when the bipolar plate is combined into a bipolar plate;

[0033] Figure 5 for Figure 4 A partial enlargement of the bipolar plate assembly structure Figure II ;

[0034] Figure 6 It is a schematic diagram of an electrolytic cell in a specific embodiment of the present application.

[0035] Description of Reference Numerals

[0036] 1 Plate body 2 Anode frame

[0037] 3 Cathode frame 4 Water and oxygen flow hole

[0038] 5 Hydrogen flow hole 6 Membrane electrode

[0039] 101 Main frame 102 Main partition

[0040] 103 anode surface 104 cathode surface

[0041] 201 Anode welding tank 202 Anode guide tank

[0042] 203 Anode sealing tank 301 Cathode welding tank

[0043] 302 cathode guide groove 303 cathode sealing groove DETAILED DESCRIPTION

[0044] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0045] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0046] like Figures 1 to 5 As shown, the first exemplary embodiment of the present application provides a bipolar plate assembly structure, which mainly includes a plate body 1, an anode frame 2 and a cathode frame 3. Among them, the plate body 1 includes a main body frame 101 and a main body partition 102, the main body partition 102 is arranged in the main body frame 101, and the two side surfaces of the main body partition 102 are respectively formed as an anode surface 103 and a cathode surface 104. The anode frame 2 is a frame structure with a hollow middle portion, and the anode frame 2 is stacked on the surface of the main body frame 101 on the side of the anode surface 103, thereby defining an anode reaction area together with the anode surface 103, and the anode reaction area is the place where water is electrolyzed to precipitate oxygen, hydrogen ions and electrons. As shown Figure 3 As shown, the anode frame 2 is formed with an anode welding groove 201 for welding with the main body frame 101, and the anode welding groove 201 is formed at least on the outer surface of the peripheral portion of the anode frame 2. In this way, the area where the anode welding groove 201 is located is melted through by the welding technology, so that the peripheral portion of the anode frame 2 and the peripheral portion of the main body frame 101 can be welded together.

[0047] Similarly, the cathode frame 3 is stacked on the surface of the main frame 101 located on the cathode surface 104 side, thereby defining a cathode reaction area together with the cathode surface 104. The cathode reaction area is a place where hydrogen ions absorb electrons to form hydrogen. Figure 5As shown, the cathode frame 3 is formed with a cathode welding groove 301 for welding connection with the main body frame 101, and the cathode welding groove 301 is formed at least on the outer surface of the peripheral portion of the cathode frame 3. In this way, the area where the cathode welding groove 301 is located is melted through by the welding technology, so that the peripheral portion of the cathode frame 3 and the peripheral portion of the main body frame 101 can be welded together.

[0048] It can be seen that the bipolar plate assembly structure of the exemplary embodiment forms a bipolar plate having an anode reaction area and a cathode reaction area by adding an anode frame 2 and a cathode frame 3 on both sides of the plate body 1, and combining the plate body 1, the anode frame 2 and the cathode frame 3 into one by a fusion welding technology such as laser welding. The key is that in the process of welding the bipolar plate, the anode fusion welding groove 201 and the cathode fusion welding groove 301 play a role in welding positioning, thereby improving the connection accuracy of the anode frame 2 and the cathode frame 3, and ensuring a high degree of sealing between the frame and the main board. At the same time, compared with the prior art, it can greatly reduce the use of sealing parts, simplify the structure of the bipolar plate, thereby reducing the difficulty of assembling the electrolytic cell, thereby reducing the risk of hydrogen leakage and improving safety performance.

[0049] In an optional or preferred embodiment, Figures 1 to 5 As shown, the bipolar plate assembly structure also includes water-oxygen flow holes 4 and hydrogen flow holes 5 that are set through the anode frame 2, the main frame 101 and the cathode frame 3. An anode flow groove 202 that connects the water-oxygen flow holes 4 and the anode reaction zone is formed on the inner surface of the anode frame 2, and a cathode flow groove 302 that connects the hydrogen flow holes 5 and the cathode reaction zone is formed on the inner surface of the cathode frame 3. As a result, water used for electrolysis reaction can enter the anode reaction zone from the water-oxygen flow holes 4 and the anode flow groove 202 in sequence, and hydrogen produced in the cathode reaction zone can be discharged through the cathode flow groove 302 and the hydrogen flow hole 5 in sequence.

[0050] Reference Figure 3 and Figure 5 After the anode frame 2, the main frame 101 and the cathode frame 3 are welded together, the anode guide groove 202 and the frame surface of the main frame 101 jointly define a flow channel for guiding water and oxygen, and the cathode guide groove 302 and the frame surface of the main frame 101 jointly define a flow channel for guiding hydrogen. The present application does not limit the number of the anode guide groove 202 and the cathode guide groove 302. In the present embodiment, the anode guide groove 202 and the cathode guide groove 302 are both provided with a plurality, and the plurality of anode guide grooves 202 and the plurality of cathode guide grooves 302 are arranged at intervals from each other to facilitate the rapid discharge of water, oxygen and hydrogen.

[0051] In some embodiments, reference Figure 1, both the water-oxygen flow hole 4 and the hydrogen flow hole 5 can be provided with two, and the two water-oxygen flow holes 4 and the two hydrogen flow holes 5 are respectively arranged on the lateral sides of the bipolar plate assembly structure, and the water-oxygen flow holes 4 and the hydrogen flow holes 5 on the same side are arranged at intervals from each other, and the two water-oxygen flow holes 4 and the two hydrogen flow holes 5 on the opposite sides are arranged symmetrically about the center of the main partition 102. One of the two water-oxygen flow holes 4 can be a flow hole for inputting water flow, and the other can be a flow hole for outputting water flow and oxygen. Both hydrogen flow holes 5 can be used to output hydrogen, thereby improving the reaction and gas production efficiency.

[0052] The water oxygen flow hole 4 and the hydrogen flow hole 5 can be rectangular, circular, polygonal, etc. Since the water flow rate is greater than the hydrogen flow rate, the cross-sectional area of ​​the water oxygen flow hole 4 is set to be greater than the cross-sectional area of ​​the hydrogen flow hole 5.

[0053] In an optional or preferred embodiment, Figure 3 As shown, the anode welding groove 201 is also formed on the outer surface of the hole edge of the anode frame 2 surrounding the hydrogen flow hole 5. Therefore, when the anode frame 2 is welded to the electrode plate body 1, in addition to being able to weld around the peripheral edge of the anode frame 2, it is also possible to weld around the hole edge of the hydrogen flow hole 5, thereby improving the connection strength between the anode frame 2 and the electrode plate body 1 and improving the sealing performance.

[0054] Similarly, in an optional or preferred embodiment, as Figure 5 As shown, the cathode welding groove 301 is also formed on the outer surface of the hole edge of the cathode frame 3 surrounding the water-oxygen flow hole 4. Therefore, when the cathode frame 3 is welded to the electrode body 1, in addition to being able to weld around the peripheral edge of the cathode frame 3, it is also possible to weld around the hole edge of the water-oxygen flow hole 4, thereby improving the connection strength between the cathode frame 3 and the electrode body 1 and improving the sealing performance.

[0055] It should be noted that, since the anode frame 2 is formed with the above-mentioned anode guide groove 202 at the edge of the hole surrounding the water-oxygen flow hole 4, in order to avoid damaging the anode guide groove 202 and causing the flow channel to be blocked when welding the anode frame 2, it should be avoided to set the anode melting welding groove 201 on the other side opposite to the anode guide groove 202. In other words, it is not necessary to weld the frame section of the anode frame 2 located between the water-oxygen flow hole 4 and the anode reaction area. Similarly, it should be avoided to set the cathode melting welding groove 301 on the other side opposite to the cathode guide groove 302 to avoid blocking the cathode guide groove 302 after welding.

[0056] like Figure 6As shown, in the electrolytic cell, multiple bipolar plates divide the electrolytic cell into multiple reaction chambers, that is, the anode reaction area of ​​one of the two adjacent bipolar plates and the cathode reaction area of ​​the other jointly define the chamber, wherein a membrane electrode 6 is also provided between the anode frame 2 and the cathode frame 3, and the membrane electrode separates the anode reaction area and the cathode reaction area. When the electrolysis reaction is carried out, hydrogen ions pass through the membrane electrode 6 to reach the cathode reaction area.

[0057] In order to make the membrane electrode 6 fit the anode frame 2, Figure 3 As shown, an anode sealing groove 203 for filling the anode sealing strip is formed on the anode frame 2, and the anode sealing groove 203 is formed at least on the outer surface of the peripheral portion of the anode frame 2. Therefore, when installing the electrolytic cell, an anode sealing strip of a certain height can be formed in the anode sealing groove 203 by a dispensing process, and then the membrane electrode 6 is stacked and pressed on the anode sealing strip, so that the membrane electrode 6 can be attached to the anode frame 2, so that the anode reaction area forms a relatively sealed space, and the sealing of the anode reaction area is ensured.

[0058] Similarly, in order to make the membrane electrode 6 fit the cathode frame 3, Figure 3 As shown, a cathode sealing groove 303 for filling the cathode sealing strip is formed on the cathode frame 3, and the cathode sealing groove 303 is formed at least on the outer surface of the peripheral portion of the cathode frame 3. Therefore, when installing the electrolytic cell, a cathode sealing strip of a certain height can be formed in the cathode sealing groove 303 by a dispensing process, and then the membrane electrode 6 is stacked and pressed on the cathode sealing strip, so that the membrane electrode 6 can be attached to the cathode frame 3, so that the cathode reaction zone forms a relatively sealed space, and the sealing of the cathode reaction zone is ensured.

[0059] Furthermore, the anode sealing groove 203 is also formed on the outer surface of the hole edge of the anode frame 2 surrounding the water-oxygen flow hole 4 and the outer surface of the hole edge surrounding the hydrogen flow hole 5. Therefore, when the anode sealing strip is filled, the anode sealing strip can be arranged around the water-oxygen flow hole 4 and the hydrogen flow hole 5, and then, when the membrane electrode 6 is laid and attached to the anode frame 2, the anode sealing strip forms a barrier structure to prevent the fluid in the water-oxygen flow hole 4 and the hydrogen flow hole 5 from flowing into the anode reaction area through the gap between the membrane electrode 6 and the anode frame 2, or to prevent the fluid in the anode reaction area from flowing out to the water-oxygen flow hole 4 and the hydrogen flow hole 5. At the same time, the anode sealing strip arranged around the water-oxygen flow hole 4 and the hydrogen flow hole 5 and the anode sealing strip arranged around the peripheral portion of the anode frame 2 form a double sealing effect.

[0060] The anode sealing groove 203 can also be formed on the outer surface of the peripheral portion of the anode frame 2 surrounding the anode reaction zone. After the anode sealing groove 203 is filled with the anode sealing strip, the membrane electrode 6 stacked on the anode sealing strip can better seal the anode reaction zone so that no gap is left around the anode reaction zone.

[0061] Similarly, the cathode sealing groove 303 can also be formed on the outer surface of the hole edge of the cathode frame 3 surrounding the water oxygen flow hole 4 and the outer surface of the hole edge surrounding the hydrogen flow hole 5. When the cathode sealing strip is filled, the cathode sealing strip can be arranged around the water oxygen flow hole 4 and the hydrogen flow hole 5, and then, when the membrane electrode 6 is laid and attached to the cathode frame 3, the fluid in the water oxygen flow hole 4 and the hydrogen flow hole 5 can be prevented from flowing into the cathode reaction area through the gap between the membrane electrode 6 and the cathode frame 3, or the fluid in the cathode reaction area can be prevented from flowing out to the water oxygen flow hole 4 and the hydrogen flow hole 5.

[0062] The cathode sealing groove 303 can also be formed on the outer surface of the peripheral portion of the cathode frame 3 surrounding the cathode reaction zone. After the cathode sealing strip is filled in the cathode sealing groove 303, the membrane electrode 6 stacked on the cathode sealing strip can better seal the cathode reaction zone, leaving no gap around the cathode reaction zone.

[0063] The second exemplary embodiment of the present application provides a bipolar plate, which is assembled by the above-mentioned bipolar plate assembly structure. Therefore, each embodiment of the bipolar plate described below can obviously obtain the technical effects brought by each corresponding embodiment of the above-mentioned method. Therefore, for each embodiment described below, only the additional technical effects brought by its structural features are described to avoid repeating the previous content.

[0064] like Figures 1 to 5 As shown, the bipolar plate of this exemplary embodiment includes a plate body 1, an anode frame 2 and a cathode frame 3. The plate body 1 includes a main body frame 101 and a main body separator 102 disposed in the main body frame 101, and two side surfaces of the main body separator 102 are formed as an anode surface 103 and a cathode surface 104, respectively.

[0065] The anode frame 2 is stacked on the main frame 101 and defines an anode reaction area together with the anode surface 103. An anode welding portion is formed on the anode frame 2 and is welded to the main frame 101. The anode welding portion is formed by welding an anode welding groove 201 formed at least on the outer surface of the peripheral portion of the anode frame 2.

[0066] The cathode frame 3 is stacked on the main frame 101 and defines a cathode reaction area together with the cathode surface 104. A cathode welding portion is formed on the cathode frame 3 and is welded to the main frame 101. The cathode welding portion is formed by welding a cathode welding groove 301 formed at least on the outer surface of the peripheral portion of the cathode frame 3.

[0067] It can be seen that the bipolar plate of this exemplary embodiment is assembled and welded in sequence by the anode frame 2, the plate body 1 and the cathode frame 3. The anode fusion welding portion arranged around the peripheral portion of the anode frame 2 can effectively seal the joint between the anode frame 2 and the plate body 1, and the cathode fusion welding portion arranged around the peripheral portion of the cathode frame 3 can effectively seal the joint between the cathode frame 3 and the plate body 1, thereby avoiding leakage in the anode reaction area and the cathode reaction area. The key is that the bipolar plate of this exemplary embodiment has a simple structure, which can reduce the difficulty of assembling the bipolar plate and the electrolytic cell composed of the bipolar plate, reduce the workload and assembly tolerance, and improve the product qualification rate.

[0068] In one embodiment, the bipolar plate further comprises water-oxygen flow holes 4 and hydrogen flow holes 5 which are arranged through the anode frame 2, the main frame 101 and the cathode frame 3, and an anode guide groove 202 which connects the water-oxygen flow holes 4 and the anode reaction zone is formed on the inner surface of the anode frame 2, and a cathode guide groove 302 which connects the hydrogen flow holes 5 and the cathode reaction zone is formed on the inner surface of the cathode frame 3.

[0069] In one embodiment, if Figure 3 As shown, the anode welded portion is also formed on the outer surface of the edge of the anode frame 2 surrounding the hydrogen flow hole 5, so that the edge of the hydrogen flow hole 5 can be sealed and the anode frame 2 can be reinforced.

[0070] In one embodiment, if Figure 5 As shown, the cathode welded portion is also formed on the outer surface of the hole edge of the cathode frame 3 surrounding the water-oxygen flow hole 4, so as to seal the hole edge of the water-oxygen flow hole 4 and reinforce the cathode frame 3.

[0071] In one embodiment, if Figure 3 As shown, an anode sealing groove 203 is also formed on the anode frame 2, and the anode sealing groove 203 is formed at least on the outer surface of the peripheral portion of the anode frame 2. The bipolar plate of this embodiment also includes an anode sealing strip filled in the anode sealing groove 203, so that the membrane electrode 6 can be stacked and pressed onto the anode frame 2 to ensure the sealing between the membrane electrode 6 and the anode frame 2.

[0072] In one embodiment, if Figure 5 As shown, a cathode sealing groove 303 is also formed on the cathode frame 3, and the cathode sealing groove 303 is formed at least on the outer surface of the peripheral portion of the cathode frame 3. The bipolar plate of this embodiment also includes a cathode sealing strip filled in the cathode sealing groove 303, so that the membrane electrode 6 can be stacked and pressed onto the cathode frame 3 to ensure the sealing between the membrane electrode 6 and the cathode frame 3.

[0073] In one embodiment, if Figure 3As shown, the anode sealing groove 203 is also formed on the outer surface of the hole edge portion of the anode frame 2 surrounding the water and oxygen flow holes 4, the outer surface of the hole edge portion surrounding the hydrogen flow holes 5, and the outer surface of the peripheral portion surrounding the anode reaction zone, thereby being able to seal the hole edges of the water and oxygen flow holes 4 and the hole edges of the hydrogen flow holes 5 located on the anode frame 2 and the peripheral edge of the anode reaction zone.

[0074] In one embodiment, if Figure 5 As shown, the cathode sealing groove 303 is also formed on the outer surface of the hole edge portion of the cathode frame 3 surrounding the water and oxygen flow holes 4, the outer surface of the hole edge portion surrounding the hydrogen flow holes 5, and the outer surface of the peripheral portion surrounding the cathode reaction zone, so that the hole edges of the water and oxygen flow holes 4 and the hole edges of the hydrogen flow holes 5 located on the cathode frame 3 and the peripheral edge of the cathode reaction zone can be sealed.

[0075] like Figure 6 As shown, the third exemplary embodiment of the present application provides an electrolytic cell, which includes the bipolar plate described above. Obviously, the electrolytic cell of this exemplary embodiment has all the technical effects brought by the bipolar plate described above, so it will not be repeated here.

[0076] The fourth exemplary embodiment of the present application further provides a hydrogen production system, which includes the electrolyzer of the hydrogen production system. Obviously, the hydrogen production system of this exemplary embodiment also has all the technical effects brought by the above-mentioned bipolar plate, so it will not be repeated here.

[0077] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A bipolar plate assembly structure, characterized in that: include: The electrode body (1) comprises a body frame (101) and a body separator (102) arranged in the body frame (101), wherein two side surfaces of the body separator (102) are respectively formed as an anode surface (103) and a cathode surface (104); an anode frame (2) stacked on the main body frame (101) and defining an anode reaction area together with the anode surface (103); the anode frame (2) is provided with an anode welding groove (201) for welding to the main body frame (101); the anode welding groove (201) is at least formed on the outer surface of the peripheral portion of the anode frame (2); and A cathode frame (3) is stacked on the main body frame (101) and defines a cathode reaction area together with the cathode surface (104); a cathode welding groove (301) for welding to the main body frame (101) is formed on the cathode frame (3); the cathode welding groove (301) is formed at least on the outer surface of the peripheral portion of the cathode frame (3).

2. The bipolar plate assembly structure according to claim 1, characterized in that: The bipolar plate assembly structure further comprises water-oxygen flow holes (4) and hydrogen flow holes (5) which are arranged through the anode frame (2), the main frame (101) and the cathode frame (3); an anode flow groove (202) which connects the water-oxygen flow holes (4) and the anode reaction zone is formed on the inner surface of the anode frame (2); and a cathode flow groove (302) which connects the hydrogen flow holes (5) and the cathode reaction zone is formed on the inner surface of the cathode frame (3).

3. The bipolar plate assembly structure according to claim 2, characterized in that: The anode welding groove (201) is also formed on the outer surface of the hole edge of the anode frame (2) surrounding the hydrogen flow hole (5); And / or, the cathode welding groove (301) is also formed on the outer surface of the hole edge portion of the cathode frame (3) surrounding the water-oxygen flow hole (4).

4. The bipolar plate assembly structure according to claim 2, characterized in that: An anode sealing groove (203) for filling an anode sealing strip is formed on the anode frame (2), and the anode sealing groove (203) is formed at least on the outer surface of the peripheral portion of the anode frame (2); And / or, a cathode sealing groove (303) for filling a cathode sealing strip is formed on the cathode frame (3), and the cathode sealing groove (303) is at least formed on the outer surface of the peripheral portion of the cathode frame (3).

5. The bipolar plate assembly structure according to claim 4, characterized in that: The anode sealing groove (203) is also formed on the outer surface of the hole edge of the anode frame (2) surrounding the water oxygen flow hole (4), the outer surface of the hole edge surrounding the hydrogen flow hole (5), and the outer surface of the peripheral edge surrounding the anode reaction area; And / or, the cathode sealing groove (303) is also formed on the outer surface of the hole edge of the cathode frame (3) surrounding the water-oxygen flow hole (4), the outer surface of the hole edge surrounding the hydrogen flow hole (5), and the outer surface of the peripheral edge surrounding the cathode reaction zone.

6. A bipolar plate, characterized in that: include: The electrode body (1) comprises a body frame (101) and a body separator (102) arranged in the body frame (101), wherein two side surfaces of the body separator (102) are respectively formed as an anode surface (103) and a cathode surface (104); an anode frame (2) stacked on the main body frame (101) and defining an anode reaction area together with the anode surface (103); the anode frame (2) is provided with an anode welding portion connected to the main body frame (101) by welding, the anode welding portion being formed by welding an anode welding groove (201) formed at least on the outer surface of the peripheral portion of the anode frame (2); and A cathode frame (3) is stacked on the main body frame (101) and defines a cathode reaction area together with the cathode surface (104); a cathode welding portion is formed on the cathode frame (3) and is welded to the main body frame (101); the cathode welding portion is formed by welding a cathode welding groove (301) formed at least on the outer surface of the peripheral portion of the cathode frame (3).

7. The bipolar plate according to claim 6, characterized in that: The bipolar plate further comprises water-oxygen flow holes (4) and hydrogen flow holes (5) which are arranged through the anode frame (2), the main frame (101) and the cathode frame (3); an anode flow guide groove (202) which connects the water-oxygen flow holes (4) and the anode reaction zone is formed on the inner surface of the anode frame (2); and a cathode flow guide groove (302) which connects the hydrogen flow holes (5) and the cathode reaction zone is formed on the inner surface of the cathode frame (3).

8. The bipolar plate according to claim 7, characterized in that: The anode fusion welding portion is also formed on the outer surface of the hole edge portion of the anode frame (2) surrounding the hydrogen flow hole (5); And / or, the cathode fusion welding portion is also formed on the outer surface of the hole edge portion of the cathode frame (3) surrounding the water-oxygen flow hole (4).

9. The bipolar plate according to claim 7, characterized in that: An anode sealing groove (203) is also formed on the anode frame (2), and the anode sealing groove (203) is at least formed on the outer surface of the peripheral edge portion of the anode frame (2), and the bipolar plate also includes an anode sealing strip filled in the anode sealing groove (203); And / or, a cathode sealing groove (303) is also formed on the cathode frame (3), and the cathode sealing groove (303) is at least formed on the outer surface of the peripheral portion of the cathode frame (3). The bipolar plate also includes a cathode sealing rubber strip filled in the cathode sealing groove (303), which can be integrated with the bipolar plate by using a dispensing process and realize hydrogen sealing after being pressed together with the membrane electrode stack.

10. The bipolar plate according to claim 9, characterized in that: The anode sealing groove (203) is also formed on the outer surface of the hole edge of the anode frame (2) surrounding the water oxygen flow hole (4), the outer surface of the hole edge surrounding the hydrogen flow hole (5), and the outer surface of the peripheral edge surrounding the anode reaction area; And / or, the cathode sealing groove (303) is also formed on the outer surface of the hole edge of the cathode frame (3) surrounding the water-oxygen flow hole (4), the outer surface of the hole edge surrounding the hydrogen flow hole (5), and the outer surface of the peripheral edge surrounding the cathode reaction zone.

Images