Pole frame sealing structure, pole frame assembly and electrolytic bath

Abstract

The invention relates to the technical field of hydrogen production, in particular to a pole frame sealing structure, a pole frame assembly and an electrolytic bath. The pole frame sealing structure comprises a sealing matching piece, a first sealing piece and a second sealing piece. The first sealing element is arranged on the first pole frame and the second pole frame, and the second sealing element is arranged on the first pole frame and / or the second pole frame. The first sealing pieces on the first pole frame and the second pole frame are connected with the non-reaction area and seal the reaction area; the second sealing piece is arranged on the outer edge of the hydrogen flow channel and / or the water flow channel, and the second sealing piece is in sealing fit with the sealing matching piece so as to seal the hydrogen flow channel and / or the water flow channel. According to the electrode frame sealing structure, the electrode frame assembly and the electrolytic cell, the reaction areas on the two sides of the membrane electrode are sealed through the first sealing piece, the second sealing piece is used in cooperation with the sealing matching piece, meanwhile, partitioned sealing of the reaction areas and the water / air flow channel is achieved, edge sealing is not needed, and the sealing performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and in particular to a pole frame sealing structure, a pole frame assembly and an electrolyzer. Background Art

[0002] In the design and manufacturing process of electrolyzers, especially in the design and manufacturing of proton exchange membrane electrolyzers, the pole frame is an important component, which plays the role of height limitation, position limitation and protection of gas diffusion layer. Traditional pole frames mainly use a single sealing method, such as soft sealing sealant line (such as fluororubber or EPDM rubber, etc.) or hard sealing gasket (such as polytetrafluoroethylene), and are not yet compatible with two sealing methods. The above two sealing methods generally require the edge sealing of the proton exchange membrane, resulting in waste of membrane materials and low utilization of membrane materials. In addition, the single sealing form has the problem of poor sealing performance. Summary of the invention

[0003] The present invention provides a pole frame sealing structure, a pole frame assembly and an electrolytic cell, which are used to solve the problem that the sealing method using soft sealing sealant wire or hard sealing gasket in the prior art needs to seal the edge of the proton exchange membrane, resulting in waste of membrane materials and low utilization rate of the membrane materials, and the single sealing form has the defect of poor sealing performance. By combining the two sealing methods, it is unnecessary to seal the edge of the proton exchange membrane, and the sealing performance of the pole frame is enhanced.

[0004] The present invention provides a pole frame sealing structure, comprising: a sealing fitting, a first sealing member and a second sealing member; the first sealing member is respectively arranged on the first pole frame and the second pole frame, the second sealing member is arranged on the first pole frame and / or the second pole frame, the first pole frame is arranged on one side of a membrane electrode, the second pole frame is arranged on the other side of the membrane electrode, a reaction zone and a non-reaction zone are formed on both sides of the membrane electrode, a hydrogen flow channel is formed on both the first pole frame and the second pole frame, and a water flow channel is formed on both the first pole frame and the second pole frame; Wherein, the first sealing member on the first pole frame is connected to the non-reactive area on one side of the membrane electrode and seals the reactive area, and the first sealing member on the second pole frame is connected to the non-reactive area on the other side of the membrane electrode and seals the reactive area; The second sealing member is arranged at the outer edge of the hydrogen flow channel and / or the water flow channel, and the second sealing member is sealingly matched with the sealing matching member to seal the hydrogen flow channel and / or the water flow channel.

[0005] According to the pole frame sealing structure provided by the present invention, the first sealing member on the first pole frame is arranged on a side close to the membrane electrode, and the first sealing member on the second pole frame is arranged on a side close to the membrane electrode; Furthermore, the projections of the first sealing member on the first pole frame and the second sealing member on the second pole frame on the plane where the membrane electrode is located are arranged opposite to each other.

[0006] According to the pole frame sealing structure provided by the present invention, the first sealing member comprises: a plurality of circles of sealing water lines which are nested, and a groove is formed between two adjacent circles of the sealing water lines, and the sealing water lines are tightly connected to the membrane electrode.

[0007] According to the pole frame sealing structure provided by the present invention, the second sealing member comprises: A first sealing adhesive groove is provided on a side of the first pole frame and / or the second pole frame close to the membrane electrode; The sealing fitting comprises: The first sealant line is arranged between the first pole frame and the second pole frame, and the first sealant groove is sealed and connected to the second pole frame through the first sealant line.

[0008] According to the pole frame sealing structure provided by the present invention, the second sealing member further comprises: A second sealing adhesive groove is arranged on the first electrode frame and is away from one side of the membrane electrode; A third sealing adhesive groove is arranged on the second electrode frame and is away from one side of the membrane electrode; The sealing fitting also includes: A second sealant line, arranged on the second sealant groove; The third sealing glue line is arranged on the third sealing glue groove.

[0009] The present invention also provides a pole frame assembly, comprising: the pole frame sealing structure of the present invention.

[0010] According to the pole frame assembly provided by the present invention, a first distribution area is formed on the first pole frame, and the first distribution area is connected between the reaction area and the water flow channel for uniformly distributing inlet and outlet water; A second distribution area is formed on the second pole frame. The second distribution area is connected between the reaction area and the hydrogen flow channel and is used for evenly distributing hydrogen to discharge.

[0011] According to the pole frame assembly provided by the present invention, a plurality of strip-shaped bosses are formed inside the first distribution area and inside the second distribution area, and both ends of the strip-shaped bosses have guide portions.

[0012] The pole frame assembly provided according to the present invention also includes: A first gas diffusion layer is located on one side of the membrane electrode and is disposed in a hollow area of ​​the first electrode frame; The second gas diffusion layer is located on the other side of the membrane electrode and in the hollow area of ​​the second electrode frame.

[0013] The present invention further provides an electrolytic cell, comprising: the pole frame sealing structure provided by the present invention, or the pole frame assembly provided by the present invention.

[0014] The present invention provides a pole frame sealing structure, which includes: a sealing fitting, a first sealing fitting, and a second sealing fitting. The first sealing fitting is respectively arranged on the first pole frame and the second pole frame, and the second sealing fitting is arranged on the first pole frame and / or the second pole frame. The first pole frame is arranged on one side of the membrane electrode, and the second pole frame is arranged on the other side of the membrane electrode. Reaction areas and non-reaction areas are formed on both sides of the membrane electrode. Hydrogen flow channels are formed on the first pole frame and the second pole frame, and water flow channels are formed on the first pole frame and the second pole frame. The first sealing fitting on the first pole frame is connected to the non-reaction area on one side of the membrane electrode and seals the reaction area, and the first sealing fitting on the second pole frame is connected to the non-reaction area on the other side of the membrane electrode and seals the reaction area; the second sealing fitting is arranged on the outer edge of the hydrogen flow channel and / or the water flow channel, and the second sealing fitting is sealed with the sealing fitting to seal the hydrogen flow channel and / or the water flow channel. The present invention provides a pole frame sealing structure, which uses a first seal to seal the reaction zones on both sides of the membrane electrode, which can avoid the risk of hydrogen and oxygen cross-talk on both sides of the reaction zone, and improve the purity of hydrogen production and operational safety; the second seal is used in conjunction with the sealing fitting to achieve sealing at the hydrogen flow channel and / or water flow channel. The present invention provides a pole frame sealing structure, which simultaneously achieves the partition sealing of the reaction zone and the water / gas flow channel. By combining the two sealing methods, there is no need to seal the edge of the proton exchange membrane, and the overall sealing performance of the pole frame is enhanced.

[0015] Furthermore, a pole frame assembly provided by the present invention has the same advantages as above because it includes the pole frame sealing structure in the above embodiment of the present invention.

[0016] Furthermore, an electrolytic cell provided by the present invention has the same advantages as above because it includes the pole frame sealing structure in the above embodiment of the present invention, or the pole frame assembly in the above embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of an exploded view of a pole frame sealing structure provided in one embodiment of the present invention.

[0019] Figure 2 It is a front structural schematic diagram of a first pole frame provided in one embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the back structure of the first pole frame provided in one embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of the partial structure of the sealing water line provided in one embodiment of the present invention.

[0022] Figure 5 It is a front structural schematic diagram of a second pole frame provided in one embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of the back structure of the second pole frame provided in one embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the membrane electrode provided in one embodiment of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of a pole frame assembly provided in one embodiment of the present invention.

[0026] Reference numerals: 1: first pole frame; 11: first sealing member; 111: sealing water line; 12: second sealing member; 121: first sealing glue groove; 122: second sealing glue groove; 123: third sealing glue groove; 13: hydrogen flow channel; 14: water flow channel; 15: positioning hole; 16: foolproof fillet; 17: first distribution area; 2: second pole frame; 21: second distribution area; 3: sealing fitting; 31: first sealing glue line; 32: second sealing glue line; 33: third sealing glue line; 4: membrane electrode; 41: reaction area; 42: non-reaction area; 5: first pole plate; 6: first gas diffusion layer; 7: second gas diffusion layer; 8: second pole plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present embodiment.

[0029] In addition, 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this embodiment, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this embodiment, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" 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 or an electrical connection; 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 those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Combine the following Figure 1-Figure 8 The pole frame sealing structure of the present invention is described. The pole frame sealing structure comprises: a sealing mating component 3 , a first sealing component 11 and a second sealing component 12 .

[0033] The first seal 11 is respectively arranged on the first pole frame 1 and the second pole frame 2, the second seal 12 is arranged on the first pole frame 1 and / or the second pole frame 2, the first pole frame 1 is arranged on one side of the membrane electrode 4, and the second pole frame 2 is arranged on the other side of the membrane electrode 4, a reaction area 41 and a non-reaction area 42 are formed on both sides (front and back) of the membrane electrode 4, a hydrogen flow channel 13 is formed on both the first pole frame 1 and the second pole frame 2, and a water flow channel 14 is formed on both the first pole frame 1 and the second pole frame 2.

[0034] Among them, the first seal 11 on the first pole frame 1 is connected to the non-reaction area 42 on one side of the membrane electrode 4 and seals the reaction area 41, and the first seal 11 on the second pole frame 2 is connected to the non-reaction area 42 on the other side of the membrane electrode 4 and seals the reaction area 41; the second seal 12 is arranged at the outer edge of the hydrogen flow channel 13 and / or the water flow channel 14, and the second seal 12 is sealed with the sealing mating part 3 to seal the hydrogen flow channel 13 and / or the water flow channel 14.

[0035] The present invention provides a pole frame sealing structure, which can be applied to the pole frame structure of a proton exchange membrane electrolyzer. The pole frame structure generally includes: a pole plate, a gas diffusion layer, a cathode pole frame, a membrane electrode 4 and an anode pole frame, etc. The first seal 11 and the second seal 12 of the present invention are installed on the cathode pole frame and the anode pole frame (that is, the first pole frame 1 and the second pole frame 2 mentioned in the present invention).

[0036] Specifically, the central area of ​​the first pole frame 1 and the second pole frame 2 is a hollow structure, the hollow area of ​​the first pole frame 1 corresponds to the reaction area 41 on one side of the membrane electrode 4, and the hollow area of ​​the second pole frame 2 corresponds to the reaction area 41 on the other side of the membrane electrode 4. The central area of ​​the membrane electrode 4 is the reaction area 41, and the outer edge is the non-reaction area 42. Water flows through the water flow channel 14. After the membrane electrode 4 is energized, water is electrolyzed in the reaction area 41 to produce hydrogen, and the produced hydrogen is discharged from the hydrogen flow channel 13. The reaction area 41 of the membrane electrode 4 mainly provides the reaction area 41 domain for electrolyzing water to produce hydrogen, and the non-reaction area 42 mainly provides the installation and support of the membrane electrode 4. The installation hole can be processed in the non-reaction area 42 to fix it to the pole frame.

[0037] The first seal 11 is arranged on the first pole frame 1 and the second pole frame 2, and its projection on the plane where the membrane electrode 4 is located is located in the non-reaction area 42. Since the first pole frame 1 and the second pole frame 2 are respectively located on both sides of the membrane electrode 4, the first seals 11 on both sides of the membrane electrode 4 are used to cooperate with the non-reaction area 42 to achieve sealing. After the first seal 11 is clamped, the cathode and anode reaction areas 41 are separated to ensure the sealing performance of the reaction areas 41 on both sides, avoid the risk of hydrogen and oxygen cross-talk, and improve the purity of hydrogen production and operational safety.

[0038] The second seal 12 is arranged on the first pole frame 1, and the second seal 12 is located at the periphery of the first seal 11, that is, the projection of the second seal 12 on the plane where the membrane electrode 4 is located is arranged away from the reaction area 41 compared with the first seal 11, that is, the second seal 12 is closer to the outer edge of the first pole frame 1, and the hydrogen flow channel 13 and the water flow channel 14 are formed at this position. Specifically, the second seal 12 is sealed with the sealing fitting 3 to seal the hydrogen flow channel 13 and / or the water flow channel 14.

[0039] It should be understood that since both the first pole frame 1 and the second pole frame 2 are provided with a hydrogen flow channel 13 and a water flow channel 14, the second seal 12 can be provided on the first pole frame 1 or the second pole frame 2 alone, or can be provided on the first pole frame 1 and the second pole frame 2 respectively, and cooperate with the sealing fitting 3 to achieve the sealing of the hydrogen flow channel 13 and / or the water flow channel 14. It can be understood that if the water flow channel 14 needs to be sealed, the second seal 12 is processed on the outer edge of the water flow channel 14; if the hydrogen flow channel 13 needs to be sealed, the second seal 12 is processed on the outer edge of the hydrogen flow channel 13. Of course, the above-mentioned oxygen flow channel can also be sealed by the second seal 12, but the main purpose of the present invention is to produce hydrogen, so the generated oxygen can be directly discharged except for the need to collect and utilize.

[0040] Optionally, in this embodiment, a second sealing member 12 is provided on both the water flow channel 14 and the hydrogen flow channel 13 to achieve sealing of the water / gas flow channel together with the sealing fitting 3 .

[0041] Optionally, the first pole frame 1 is an approximately rectangular anode pole frame, provided with a water inlet flow channel and a water outlet flow channel, as well as a hydrogen outlet flow channel and an oxygen outlet flow channel; the second pole frame 2 is an approximately rectangular cathode pole frame, provided with a water inlet flow channel and a water outlet flow channel, as well as a hydrogen outlet flow channel and an oxygen outlet flow channel, etc.

[0042] It can be seen that the pole frame sealing structure provided by the present invention includes a first seal 11, a second seal 12 and a sealing fitting 3. The first seal 11 is arranged on one side of the first pole frame 1 and the second pole frame 2 close to the membrane electrode 4, and is located in the non-reaction area 42 of the membrane electrode 4, and seals the reaction areas 41 on both sides of the membrane electrode 4, which can avoid the risk of hydrogen and oxygen cross-talk on both sides of the reaction area 41, and improve the purity of hydrogen production and operational safety; the second seal 12 is used in conjunction with the sealing fitting 3 to achieve sealing at the hydrogen flow channel 13 and / or the water flow channel 14. A pole frame sealing structure provided by the present invention simultaneously realizes the partition sealing of the reaction area 41 and the water / gas flow channel. By combining the two sealing methods, there is no need to seal the edge of the proton exchange membrane, and the overall sealing performance of the pole frame is enhanced.

[0043] The present invention provides a pole frame sealing structure, which includes: a sealing fitting 3, a first sealing member 11 and a second sealing member 12. The first sealing member 11 is respectively arranged on the first pole frame 1 and the second pole frame 2, the second sealing member 12 is arranged on the first pole frame 1 and / or the second pole frame 2, the first pole frame 1 is arranged on one side of the membrane electrode 4, the second pole frame 2 is arranged on the other side of the membrane electrode 4, a reaction zone 41 and a non-reaction zone 42 are formed on both sides of the membrane electrode 4, a hydrogen flow channel 13 is formed on the first pole frame 1 and the second pole frame 2, and a water flow channel 14 is formed on the first pole frame 1 and the second pole frame 2. The first seal 11 on the first pole frame 1 is connected to the non-reaction zone 42 on one side of the membrane electrode 4 and seals the reaction zone 41, and the first seal 11 on the second pole frame 2 is connected to the non-reaction zone 42 on the other side of the membrane electrode 4 and seals the reaction zone 41; the second seal 12 is arranged at the outer edge of the hydrogen flow channel 13 and / or the water flow channel 14, and the second seal 12 is sealed with the sealing fitting 3 to seal the hydrogen flow channel 13 and / or the water flow channel 14. A pole frame sealing structure provided by the present invention uses the first seal 11 to seal the reaction zone 41 on both sides of the membrane electrode 4, which can avoid the risk of hydrogen and oxygen cross-talk on both sides of the reaction zone 41, and improve the purity of hydrogen production and operation safety; the second seal 12 is used in conjunction with the sealing fitting 3 to achieve sealing at the position of the hydrogen flow channel 13 and / or the water flow channel 14. A pole frame sealing structure provided by the present invention simultaneously realizes the partition sealing of the reaction zone 41 and the water / gas flow channel. By combining the two sealing methods, there is no need to seal the edge of the proton exchange membrane, and the overall sealing performance of the pole frame is enhanced.

[0044] In one embodiment of the present invention, the first seal 11 on the first pole frame 1 is arranged on a side close to the membrane electrode 4, and the first seal 11 on the second pole frame 2 is arranged on a side close to the membrane electrode 4. And the projections of the first seal 11 on the first pole frame 1 and the second seal 12 on the second pole frame 2 on the plane where the membrane electrode 4 is located are relatively arranged. Specifically, the positions of the first seals 11 on the first pole frame 1 and the second pole frame 2 are not only limited to the non-reaction area 42, but also limited to the same position of the projection of the plane where the membrane electrode 4 is located, that is, the first seals 11 of the first pole frame 1 and the second pole frame 2 are symmetrically arranged along the membrane electrode 4. The above-mentioned arrangement of the first seal 11 avoids the staggered arrangement of the first seal 11, and the membrane electrode 4 receives a large bending load, thereby increasing the compression force that the membrane electrode 4 can bear when the first seal 11 is compressed, which can further improve the sealing performance, so that the electrolytic cell can be used in a higher pressure environment.

[0045] In one embodiment of the present invention, the first seal 11 includes: multiple circles of sealing water lines 111 that are nested, and a groove is formed between two adjacent circles of sealing water lines 111, and the sealing water lines 111 are tightly connected to the membrane electrode 4. In this embodiment, the first seal 11 of the first pole frame 1 and the second pole frame 2 have the same structure, both of which are multiple circles of sealing water lines 111 that are nested, and a groove structure is formed between two adjacent circles of sealing water lines 111. The sealing of the reaction zones 41 on both sides of the membrane electrode 4 is achieved by multiple circles of sealing water lines 111. In this embodiment, the sealing water lines 111 are directly pressed and contacted with the membrane electrode 4 to achieve sealing performance, without the need to set a gasket, and since the sealing water lines 111 on both sides are relatively arranged, no large bending load will be generated on the membrane electrode 4.

[0046] In one embodiment of the present invention, the sealing water line 111 is in close contact with the non-reactive area 42 of the membrane electrode 4, the width of the sealing water line 111 is about 1-1.5 mm, the height is about 0.03-0.05 mm (about half the thickness of the proton exchange membrane), the interval between two adjacent circles of sealing water lines 111 is about 0.5-1 mm, and 5-10 sealing water lines 111 can be provided, and the proton exchange membrane is clamped by the sealing water lines 111 on the first pole frame 1 and the second pole frame 2.

[0047] The sealing waterline 111 forms a runway-type boss structure on the surface of the first pole frame 1 and the second pole frame 2, and the boss on the first pole frame 1 and the boss on the second pole frame 2 are matched. Due to the small pressure area, the sealing of both sides of the membrane electrode 4 can be completed without excessive assembly force to prevent hydrogen and oxygen from interpenetrating. At the same time, a sinking area is set in the outer area of ​​the sealing waterline 111, with a width of about 2.5-5mm, which is convenient for limiting the membrane electrode 4 during assembly, reducing the requirements for the coordination accuracy of parts, and will not cause displacement and misalignment. The sinking height of the sinking area is consistent with the waterline height, which is used for proton exchange membrane filling to prevent the thickness of the proton exchange membrane from affecting the sealing; in addition, a positioning hole 15 is set in the sinking area to facilitate the subsequent assembly and positioning of the membrane electrode 4, further improving the assembly accuracy.

[0048] In one embodiment of the present invention, the second sealing member 12 includes: a first sealing glue groove 121, the first sealing glue groove 121 is arranged on the side of the first pole frame 1 and / or the second pole frame 2 close to the membrane electrode 4; the sealing fitting 3 includes: a first sealing glue line 31, the first sealing glue line 31 is arranged between the first pole frame 1 and the second pole frame 2, and the first sealing glue groove 121 is sealed and connected to the second pole frame 2 through the first sealing glue line 31. Specifically, in this embodiment, the second sealing member 12 adopts a sealing glue groove, and the sealing fitting 3 adopts a sealing glue line, and the sealing glue line is fixed in the sealing glue groove. For example: a sealing glue groove is set on the side of the first pole frame 1 facing the membrane electrode 4, and the sealing glue line is fixed in the groove. After assembly, the sealing glue groove is pressed on the plane of the second pole frame 2 to achieve a soft sealing connection between the first pole frame 1 and the second pole frame 2, so as to prevent hydrogen and oxygen from mutually channeling in the chamber.

[0049] Furthermore, according to the different positions and sizes of the hydrogen flow channel 13 and the water flow channel 14 , sealant grooves of different sizes can be designed.

[0050] In one embodiment of the present invention, the second sealing member 12 further includes: a second sealing glue groove 122 and a third sealing glue groove 123. The second sealing glue groove 122 is arranged on the first pole frame 1 and away from the side of the membrane electrode 4; the third sealing glue groove 123 is arranged on the second pole frame 2 and away from the side of the membrane electrode 4. The sealing fitting 3 also includes: a second sealing glue line 32 and a third sealing glue line 33. The second sealing glue line 32 is arranged on the second sealing glue groove 122; the third sealing glue line 33 is arranged on the third sealing glue groove 123. In this embodiment, the second sealing member 12 is arranged on the side of the first pole frame 1 and the second pole frame 2 away from the membrane electrode 4, and the sealing connection between the first pole frame 1 and the first pole plate 5 and the sealing connection between the second pole frame 2 and the second pole plate 8 are achieved by matching the corresponding second sealing glue line 32 and the third sealing glue line 33.

[0051] Specifically, the first electrode plate 5 is arranged on the side of the first electrode frame 1 away from the membrane electrode 4, the second electrode plate 8 is arranged on the side of the second electrode frame 2 away from the membrane electrode 4, the second sealing glue groove 122 is sealed and connected to the first electrode plate 5 through the second sealing glue line 32, and the third sealing glue groove 123 is sealed and connected to the second electrode plate 8 through the third sealing glue line 33.

[0052] Preferably, the first electrode plate 5 and the second electrode plate 8 are both bipolar plate structures and use a bare plate structure, with water / hydrogen main flow channel holes set on the edge, mainly used for water / gas circulation; the electrode frame is divided into a cathode electrode frame and an anode electrode frame, and the material is polyetherimide, polyetheretherketone, polysulfone, etc., and water / gas main flow channel holes are set, mainly used for water / gas circulation; the middle area no longer uses the etching process to process the flow channel, and this process greatly reduces the complexity of the etching process; the substrate thickness can be reduced from more than 2 mm to about 1 mm, greatly reducing the material usage cost.

[0053] The sealant groove in the above embodiment has a width of about 4-6 mm and a depth of about 0.5-1 mm. The sealant line is at the sealant groove position, and the shape of the sealant line is consistent with the sealant groove. The sealant line uses sealing adhesive materials such as EPDM or fluororubber. The aforementioned sealing material is fixed to the sealant groove through an integrated vulcanization process. After assembly, the two pole frames are crimped on each other's surfaces through the first sealant groove 121, the second sealant groove 122 of the first pole frame 1 is pressed on the surface of the first pole plate 5, and the third sealant groove 123 of the second pole frame 2 is pressed on the surface of the second pole plate 8. By controlling the compression rate at 30%-35% and the filling rate at 85%-95%, a soft seal can be achieved to prevent hydrogen and oxygen from mutual crosstalk in the chamber.

[0054] like Figure 8 As shown, the present invention further provides a pole frame assembly. The pole frame assembly includes: the pole frame sealing structure in the above embodiment of the present invention. Specifically, the present invention provides a pole frame assembly for a proton exchange membrane electrolyzer.

[0055] A pole frame assembly provided by the present invention has the same advantages as above because it includes the pole frame sealing structure in the above embodiment of the present invention.

[0056] In one embodiment of the present invention, a first distribution area 17 is formed on the first pole frame 1, and the first distribution area 17 is connected between the reaction area 41 and the water flow channel 14, and is used to evenly distribute the water inlet and outlet. A second distribution area 21 is formed on the second pole frame 2, and the second distribution area 21 is connected between the reaction area 41 and the hydrogen flow channel 13, and is used to evenly distribute the hydrogen gas to be discharged. In this embodiment, the first distribution area 17 is set on the anode pole frame to evenly distribute water to the reaction area 41, thereby improving the reaction efficiency; the second distribution area 21 is set on the cathode pole frame to evenly distribute and discharge the generated hydrogen.

[0057] In one embodiment of the present invention, a plurality of strip-shaped bosses are formed inside the first distribution area 17 and inside the second distribution area 21, and both ends of the strip-shaped bosses have guide portions. Figure 2 and Figure 5As shown, preferably, a plurality of strip bosses are arranged perpendicular to the direction of water / air flow, and the extension direction of each strip boss is parallel to the direction of water / air flow, so as to ensure smooth water inlet and outlet. Moreover, the structure of the strip boss can provide support on the back of the sealing waterline 111, that is, the first distribution area 17 is located on the opposite side of the first seal 11 to the first pole frame 1, and the second distribution area 21 is located on the opposite side of the first seal 11 to the second pole frame 2. The sealing waterline 111 of the first pole frame 1 and the second pole frame 2 is supported by the above-mentioned strip boss structure, so as to avoid sealing failure at the sealing waterline 111 due to insufficient assembly force. In addition, guide portions are formed at both ends of the strip boss, and the guide portions are preferably arc-shaped transition portions, which can guide the inlet / outlet of water, thereby reducing the turbulence caused by the collision of the fluid with the strip boss.

[0058] In one embodiment of the present invention, the pole frame assembly further includes: a first gas diffusion layer 6 and a second gas diffusion layer 7. The first gas diffusion layer 6 is located on one side of the membrane electrode 4 and is arranged in the hollow area of ​​the first pole frame 1; the second gas diffusion layer 7 is located on the other side of the membrane electrode 4 and is located in the hollow area of ​​the second pole frame 2. Preferably, the first gas diffusion layer 6 is an anode gas diffusion layer, and the second gas diffusion layer 7 is a cathode gas diffusion layer; both the anode pole frame and the cathode pole frame are hollow structures, the cathode gas diffusion layer is placed in the hollow area of ​​the cathode pole frame, and the anode gas diffusion layer is placed in the hollow area of ​​the anode pole frame to protect the gas diffusion layer from being over-compressed, and the pole frame thickness is consistent with the gas diffusion layer thickness, which is about 1.6mm~2mm.

[0059] In one embodiment of the present invention, the first pole frame 1, the second pole frame 2, the first pole plate 5 and the second pole plate 8 are all provided with foolproof fillets 16 at the outer edges to avoid problems such as reversal and displacement during assembly.

[0060] The present invention further provides an electrolytic cell, which comprises: the pole frame sealing structure in the above embodiment of the present invention, or the pole frame assembly in the above embodiment of the present invention.

[0061] An electrolytic cell provided by the present invention has the same advantages as above because it includes the pole frame sealing structure in the above embodiment of the present invention, or the pole frame assembly in the above embodiment of the present invention.

[0062] Specifically, the present invention provides an electrolyzer based on a proton exchange membrane.

[0063] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed over multiple units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pole frame sealing structure, characterized in that: include: A sealing mating component (3), a first sealing component (11) and a second sealing component (12); the first sealing component (11) is respectively arranged on the first pole frame (1) and the second pole frame (2), the second sealing component (12) is arranged on the first pole frame (1) and / or the second pole frame (2), the first pole frame (1) is arranged on one side of the membrane electrode (4), the second pole frame (2) is arranged on the other side of the membrane electrode (4), a reaction zone (41) and a non-reaction zone (42) are formed on both sides of the membrane electrode (4), a hydrogen flow channel (13) is formed on the first pole frame (1) and the second pole frame (2), and a water flow channel (14) is formed on the first pole frame (1) and the second pole frame (2); The first sealing member (11) on the first pole frame (1) is connected to the non-reactive region (42) on one side of the membrane electrode (4) and seals the reactive region (41), and the first sealing member (11) on the second pole frame (2) is connected to the non-reactive region (42) on the other side of the membrane electrode (4) and seals the reactive region (41); The second sealing component (12) is arranged on the outer edge of the hydrogen flow channel (13) and / or the water flow channel (14), and the second sealing component (12) is sealingly matched with the sealing matching component (3) to seal the hydrogen flow channel (13) and / or the water flow channel (14).

2. The pole frame sealing structure according to claim 1, characterized in that: The first sealing member (11) on the first pole frame (1) is arranged on a side close to the membrane electrode (4), and the first sealing member (11) on the second pole frame (2) is arranged on a side close to the membrane electrode (4); Furthermore, the projections of the first sealing member (11) on the first pole frame (1) and the second sealing member (12) on the second pole frame (2) on the plane where the membrane electrode (4) is located are arranged relative to each other.

3. The pole frame sealing structure according to claim 2, characterized in that: The first sealing member (11) comprises: a plurality of circles of sealing water lines (111) which are nested, and a groove is formed between two adjacent circles of the sealing water lines (111), and the sealing water lines (111) are tightly connected to the membrane electrode (4).

4. The pole frame sealing structure according to any one of claims 1 to 3, characterized in that: The second sealing member (12) comprises: A first sealing adhesive groove (121) is provided on a side of the first pole frame (1) and / or the second pole frame (2) close to the membrane electrode (4); The sealing fitting (3) comprises: A first sealing glue line (31) is arranged between the first pole frame (1) and the second pole frame (2); the first sealing glue groove (121) is sealed and connected to the second pole frame (2) via the first sealing glue line (31).

5. The pole frame sealing structure according to any one of claims 1 to 3, characterized in that: The second sealing member (12) further comprises: A second sealing adhesive groove (122) is arranged on the first electrode frame (1) and is away from a side of the membrane electrode (4); A third sealing adhesive groove (123) is arranged on the second electrode frame (2) and is away from a side of the membrane electrode (4); The sealing fitting (3) further comprises: A second sealing adhesive line (32) is arranged on the second sealing adhesive groove (122); The third sealing glue line (33) is arranged on the third sealing glue groove (123).

6. A pole frame assembly, characterized in that: include: The pole frame sealing structure according to any one of claims 1 to 5.

7. The pole frame assembly according to claim 6, characterized in that: A first distribution area (17) is formed on the first pole frame (1), and the first distribution area (17) is connected between the reaction area (41) and the water flow channel (14) and is used for evenly distributing incoming water and outgoing water; A second distribution area (21) is formed on the second pole frame (2), and the second distribution area (21) is connected between the reaction area (41) and the hydrogen flow channel (13) and is used for evenly distributing hydrogen for discharge.

8. The pole frame assembly according to claim 7, characterized in that: A plurality of strip-shaped bosses are formed inside the first distribution area (17) and inside the second distribution area (21), and both ends of the strip-shaped bosses have guide portions.

9. The pole frame assembly according to any one of claims 6 to 8, characterized in that: Also includes: A first gas diffusion layer (6), located on one side of the membrane electrode (4) and arranged in a hollow area of ​​the first electrode frame (1); The second gas diffusion layer (7) is located on the other side of the membrane electrode (4) and is located in the hollow area of ​​the second electrode frame (2).

10. An electrolytic cell, characterized in that: include: The pole frame sealing structure as described in any one of claims 1 to 5, or the pole frame assembly as described in any one of claims 6 to 9.

Images