Electrochemical assembly, electrolyzer, electrolytic hydrogen production system and hydrogen production station

Abstract

This application discloses an electrochemical assembly, an electrolyzer, an electrolytic hydrogen production system, and a hydrogen production station, belonging to the field of water electrolysis for hydrogen production. The electrochemical assembly includes: a first electrode assembly, a second electrode assembly, and a sealing isolator; the first electrode assembly includes a first electrode frame; the second electrode assembly includes a second electrode frame; the sealing isolator includes a membrane assembly and a seal integrally connected, the seal surrounding the membrane assembly; the first electrode assembly, the sealing isolator, and the second electrode assembly are sequentially stacked to form an anode chamber and a cathode chamber; the seal is sandwiched between the first electrode frame and the second electrode frame; at least a portion of the membrane assembly is disposed between the anode chamber and the cathode chamber. This application enhances the interfacial bonding force between the membrane assembly and the seal by integrally connecting the membrane assembly and the seal, reducing the risk of leakage due to membrane assembly aging and deformation, and also reduces assembly steps, improving production efficiency.

Description

Technical Field

[0001] This application belongs to the field of water electrolysis for hydrogen production, and particularly relates to an electrochemical assembly, an electrolyzer, an electrolysis hydrogen production system, and a hydrogen production station. Background Technology

[0002] In electrolytic cells with a plate and frame filter press structure, membrane modules are usually fixed by clamping the frame sealing surface with an extruder or tie rod. As the electrolytic cell is used for a long time, this can easily cause problems such as alkali leakage and gas leakage from the membrane modules, posing a safety hazard to the reliable operation of the electrolytic cell. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrochemical assembly, an electrolyzer, an electrolytic hydrogen production system, and a hydrogen production station, which reduces the risk of liquid and gas leakage caused by membrane module aging and deformation by connecting the membrane module into one unit, reduces assembly steps, and improves production efficiency.

[0004] In a first aspect, this application provides an electrochemical assembly, comprising:

[0005] The first pole assembly includes a first pole frame;

[0006] The second pole assembly includes a second pole frame;

[0007] A sealing isolation element includes a membrane assembly and a sealing element integrally connected, the sealing element being disposed around the membrane assembly, a first electrode assembly, the sealing isolation element and a second electrode assembly being sequentially stacked to form an anode chamber and a cathode chamber, the sealing element being sandwiched between the first electrode frame and the second electrode frame, and at least a portion of the membrane assembly being disposed between the anode chamber and the cathode chamber.

[0008] According to the electrochemical assembly of this application, by connecting the membrane module and the seal as a whole, on the one hand, the interfacial bonding force between the membrane module and the seal is enhanced, and the reliability of the connection between the membrane module and the seal is improved, thereby reducing the risk of leakage due to membrane module aging and deformation; on the other hand, in the assembly process of the electrochemical assembly, the integrated design of the membrane module and the seal can reduce assembly steps, improve production efficiency, and reduce production costs.

[0009] In some embodiments, the seal has an inner mounting groove, and at least a portion of the membrane assembly is located within the mounting groove and integrally connected to the inner wall of the mounting groove.

[0010] In some embodiments, the following condition is satisfied: 1 / 3W ≤ W1 ≤ 2 / 3W; where W1 is the groove depth of the mounting groove, and W is the width of the seal from the inside to the outside.

[0011] In some embodiments, the sealing element is provided with a first hole, and the membrane assembly is provided with a second hole. With the direction in which the first electrode assembly, the sealing isolator and the second electrode assembly are stacked in sequence as the projection direction, the projection of the first hole is located within the projection of the second hole.

[0012] In some embodiments, the seal has at least one protrusion on its side along the thickness direction, and the protrusion is arranged around the center of the seal.

[0013] In some embodiments, the protrusions include a plurality of protrusions, which are spaced apart and arranged around each other along the seal from the inside to the outside.

[0014] In some embodiments, the number N of protrusions satisfies: 8 ≤ N ≤ 12.

[0015] In some embodiments, the side of the protrusion facing away from the seal is arc-shaped; or,

[0016] The cross-section of the protrusion is trapezoidal; or...

[0017] The cross-section of the protrusion is rectangular.

[0018] In some embodiments, the membrane assembly is vulcanized and connected to the seal.

[0019] Secondly, this application provides an electrolytic cell, including: end plates, pull rods, and a plurality of electrochemical assemblies as described in any of the above embodiments, wherein the plurality of electrochemical assemblies are stacked and sandwiched between the end plates, and the pull rods are connected between the end plates.

[0020] Thirdly, this application provides an electrolytic hydrogen production system, comprising: an electrolytic cell, a gas-liquid separator, and a purification device as described above, wherein the inlet of the gas-liquid separator is connected to the gas-liquid outlet of the electrolytic cell, the return port of the gas-liquid separator is connected to the liquid inlet of the electrolytic cell, and the inlet of the purification device is connected to the gas outlet of the gas-liquid separator.

[0021] Fourthly, this application provides a hydrogen production station, comprising:

[0022] Electrolysis hydrogen production system as described in any of the above embodiments;

[0023] A green power generation system, wherein the green power generation system is electrically connected to the electrolysis hydrogen production system.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of the electrochemical assembly provided in the embodiments of this application;

[0027] Figure 2 This is one of the structural schematic diagrams of the sealing and isolation component provided in the embodiments of this application;

[0028] Figure 3 This is a second schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0029] Figure 4 This is the third schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0030] Figure 5 This is one of the structural schematic diagrams of the sealing element provided in the embodiments of this application;

[0031] Figure 6 This is the fourth schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0032] Figure 7 This is the fifth schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0033] Figure 8 This is a second schematic diagram of the structure of the sealing element provided in the embodiments of this application;

[0034] Figure 9 This is the sixth schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0035] Figure 10 This is the seventh schematic diagram of the structure of the sealing and isolation component provided in the embodiments of this application;

[0036] Figure 11 This is the third schematic diagram of the structure of the sealing element provided in the embodiments of this application;

[0037] Figure 12 This is a schematic diagram of the structure of the membrane module provided in the embodiments of this application.

[0038] Figure label:

[0039] Electrochemical Assembly 100

[0040] First electrode assembly 1, first electrode frame 11, first electrode plate 12, second electrode assembly 2, second electrode frame 21, second electrode plate 22, sealing and isolating element 3, membrane assembly 31, second hole 311, sealing element 32, mounting groove 321, first hole 322, protrusion 323, auxiliary mounting part 324, body 325, anode chamber 4, cathode chamber 5, bracket 6. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] The following is for reference. Figures 1-12 This application describes an electrochemical assembly 100, an electrolyzer, an electrolytic hydrogen production system, and a hydrogen production station according to embodiments of this application.

[0043] like Figure 1 As shown, the electrochemical assembly 100 of this application embodiment includes: a first electrode assembly 1, a second electrode assembly 2, and a sealing and isolating component 3.

[0044] like Figure 3 As shown, the first electrode assembly 1 includes a first electrode frame 11, which surrounds and forms a first electrode plate mounting area.

[0045] The first electrode assembly 1 also includes a first electrode plate 12, which is installed in the first electrode plate mounting area.

[0046] The first pole frame 11 serves as a support structure and can be used to fix and install the first pole plate 12. The first pole plate 12 plays the role of conducting electricity and separating. The sealing performance between the first pole plate 12 and the first pole frame 11 can be enhanced by adhesive or sealing ring.

[0047] The first electrode frame 11 can be made of a corrosion-resistant material. For example, the first electrode frame 11 can be made of PPS, PVDF or titanium plating, and its inner side can be provided with a flow channel for the transmission of electrolyte or gas.

[0048] like Figure 3 As shown, the second pole assembly 2 includes a second pole frame 21, which surrounds and forms the second pole plate mounting area.

[0049] The second electrode assembly 2 also includes a second electrode plate 22, which is installed in the second electrode plate mounting area.

[0050] One of the first electrode assembly 1 and the second electrode assembly 2 is an anode-side assembly, and the other of the first electrode assembly 1 and the second electrode assembly 2 is a cathode-side assembly.

[0051] like Figure 2 and Figure 4 As shown, the sealing isolation element 3 includes a membrane assembly 31 and a sealing element 32 connected as one piece. The sealing element 32 is arranged around the membrane assembly 31. The first electrode assembly 1, the sealing isolation element 3, and the second electrode assembly 2 are sequentially stacked to form an anode chamber 4 and a cathode chamber 5. The sealing element 32 is sandwiched between the first electrode frame 11 and the second electrode frame 21. At least a portion of the membrane assembly 31 is disposed between the anode chamber 4 and the cathode chamber 5.

[0052] The membrane module 31 and the seal 32 can be connected as one unit through injection molding and vulcanization, which enhances the interfacial bonding force between the membrane module 31 and the seal 32, improves the reliability of the connection between the membrane module 31 and the seal 32, and reduces the impact of pressure fluctuations on the hydrogen and oxygen sides in the electrolysis chamber on the membrane module 31.

[0053] For example, seal 32 can be a gasket or a sealing ring.

[0054] For example, the seal 32 is typically made of a material with good elasticity and chemical resistance, such as rubber, silicone, and polytetrafluoroethylene, to enhance the seal between the membrane assembly 31 and the two side pole frames and reduce the risk of fluid leakage.

[0055] In some embodiments, the seal 32 may be an EPDM rubber component, and the core material of the seal 32 may be stainless steel, glass fiber, or nylon, etc.

[0056] Among them, the core material of the seal 32 is the core material that plays a supporting or reinforcing role inside the seal 32, and the outer layer of the core material is covered or composited with other elastic sealing materials (such as rubber, polytetrafluoroethylene, etc.).

[0057] For example, membrane module 31 may be a polyphenylene sulfide (PPS) membrane, an asbestos membrane, or a composite membrane.

[0058] In some embodiments, the membrane assembly 31 is vulcanized to the seal 32.

[0059] The vulcanization temperature T satisfies the following condition: 120℃≤T≤150℃.

[0060] In this embodiment, the membrane module 31 has a temperature tolerance of 230℃~300℃, and the sealing element 32 has a temperature tolerance of 150℃~170℃. Setting the vulcanization temperature T below the temperature tolerance of the membrane module 31 allows the membrane module 31 and the sealing element 32 to be vulcanized together as one unit without affecting the performance of the membrane module 31.

[0061] Among them, such as Figure 2As shown, the sealing element 32 is disposed around the membrane assembly 31, the sealing element 32 surrounds the edge of the membrane assembly 31 and covers its outer edge, and the edge of the membrane assembly 31 is connected to the sealing element 32 as a whole.

[0062] The main function of the seal 32 is to reduce the gap between the membrane module 31 and the two electrode frames, thereby reducing the risk of electrolyte leakage. It can also play a certain role in insulation, reducing current leakage between the membrane module 31, the first electrode frame 11, and the second electrode frame 21. At the same time, during the electrolysis process, due to changes in factors such as temperature and pressure, the membrane module 31 and the electrode frames may undergo slight deformation. The seal can provide a certain buffering effect to protect the membrane module 31 and the electrode frames from damage.

[0063] In the electrochemical assembly of related technologies, the seal and membrane module are stacked between the first electrode module and the second electrode module. The seal and membrane module are connected by stacking, extrusion or bonding. The membrane module is fixed by using an extruder or tie rod to clamp the sealing surface of the frame. Over time, the membrane module creeps, ages and deforms, which can easily lead to liquid and gas leakage.

[0064] The electrochemical assembly 100 provided in this application integrates the membrane module 31 and the seal 32, thereby enhancing the interfacial bonding force between them and improving the reliability of their connection. This reduces the risk of leakage due to aging and deformation of the membrane module 31. Furthermore, the integrated design of the membrane module 31 and the seal 32 during the assembly of the electrochemical assembly 100 reduces assembly steps, improves production efficiency, and lowers production costs.

[0065] In some embodiments, such as Figure 4 and Figure 5 As shown, the inner side of the seal 32 has a mounting groove 321, and at least a portion of the membrane assembly 31 is located within the mounting groove 321 and is integrally connected to the inner wall of the mounting groove 321.

[0066] In this embodiment, at least a portion of the membrane assembly 31 is embedded in the seal 32 and is integrally connected to the seal 32.

[0067] The mounting groove 321 has an inwardly open opening, at least a portion of the membrane assembly 31 is located within the mounting groove 321, one side wall of the mounting groove 321 is located between the membrane assembly 31 and the first pole frame 11, and the other side wall of the mounting groove 321 is located between the membrane assembly 31 and the second pole frame 21.

[0068] In other words, such as Figure 3 As shown, a partial seal 32 is provided between the membrane assembly 31 and the first pole frame 11, and a partial seal 32 is provided between the membrane assembly 31 and the second pole frame 21.

[0069] In other words, the upper and lower sides of the membrane module 31 are connected to the two side walls of the mounting groove 321 as a whole, and the outer side of the membrane module 31 is connected to the bottom of the mounting groove 321 as a whole. That is, the membrane module 31 and the seal 32 form a connection on at least three sides, which further enhances the interfacial bonding force between the membrane module 31 and the seal 32 and improves the reliability of the connection between the membrane module 31 and the seal 32.

[0070] In this embodiment, by providing partial seals 32 on both sides of the membrane assembly 31, a seal can be formed on both sides of the membrane assembly 31, which can enhance the sealing between the membrane assembly 31 and the two side electrode frames during electrolysis, reduce the risk of electrolyte leakage, and maintain the stability of the internal environment of the electrolytic cell.

[0071] In some embodiments, such as Figure 4 As shown, the following condition is met: 1 / 3W≤W1≤2 / 3W; where W1 is the groove depth of the mounting groove 321 and W is the width of the seal 32 from the inside to the outside.

[0072] For example, W1 can be 1 / 3W, 0.5W, 0.6W, or 2 / 3W.

[0073] The sealing element 32 has an installation groove 321. The edge of the membrane assembly 31 is evenly placed in the installation groove 321, and then vulcanized and connected as a whole under high temperature and high pressure.

[0074] In this embodiment, by setting the groove depth of the mounting groove 321 to be 1 / 3 to 2 / 3 of the width of the sealing element 32 from the inside to the outside, the reliability of the connection between the membrane assembly 31 and the sealing element 32 can be improved.

[0075] In some embodiments, the mounting groove 321 is located at the center of the seal 32 along the thickness direction of the seal 32 to form a better seal between the membrane assembly 31 and the two side pole frames.

[0076] In some embodiments, such as Figure 2 and Figure 12 As shown, the sealing element 32 is provided with a first hole 322, and the membrane assembly 31 is provided with a second hole 311. With the direction in which the first electrode assembly 1, the sealing isolation element 3, and the second electrode assembly 2 are stacked in sequence as the projection direction, the projection of the first hole 322 is located within the projection of the second hole 311.

[0077] The first hole 322 and the second hole 311 are connected to form a flow channel or a gas channel. The flow channel allows the electrolyte to pass through, and the gas channel allows the gas to pass through.

[0078] The mounting groove 321 has a first hole 322 aligned with the opposite groove wall, and the membrane assembly 31 located in the mounting groove 321 has a second hole 311. With the groove wall of the mounting groove 321 and the arrangement direction of the membrane assembly 31 as the projection direction, the projection of the first hole 322 is located within the projection of the second hole 311.

[0079] In this embodiment, the area of ​​the second hole 311 of the membrane module 31 is larger than the area of ​​the first hole 322 of the seal 32. When the membrane module 31 and the seal 32 are vulcanized, the phenomenon of the membrane cloth of the membrane module 31 escaping from the first hole 322 can be reduced, thereby improving the vulcanization quality.

[0080] The first pole frame 11 and the second pole frame 21 also form corresponding hole structures, which are connected to the first hole 322 and the second hole 311 to form flow channels or air channels.

[0081] For example, such as Figure 2 As shown, the dashed line represents the second hole 311 of the membrane assembly 31, the solid line represents the first hole 322 of the seal 32, one of the oblong hole and the circular hole is the flow channel hole, and the other of the oblong hole and the circular hole is the air channel hole.

[0082] In some embodiments, such as Figure 4 and Figure 5 As shown, the seal 32 has at least one protrusion 323 on its side along the thickness direction, and the protrusion 323 is arranged around the center of the seal 32.

[0083] The protrusion 323 is provided around the membrane assembly 31. The side of the seal 32 facing the first pole frame 11 may be provided with the protrusion 323, and the side of the seal 32 facing the second pole frame 21 may be provided with the protrusion 323.

[0084] The number of protrusions 323 can be one, two or more, to improve the sealing between the seal 32 and the two side pole frames.

[0085] The protrusion shape of the protrusion 323 can be set according to the processing technology.

[0086] For example, the cross-section of the protrusion 323 can be trapezoidal, rectangular or semi-circular.

[0087] When the cross-section of the protrusion 323 is semi-circular, the side of the protrusion 323 facing away from the seal 32 is arc-shaped.

[0088] In some embodiments, such as Figure 4 and Figure 5 As shown, the protrusions 323 include a plurality of protrusions 323, which are spaced apart and arranged around each other along the direction from the inside to the outside of the seal 32.

[0089] The number N of protrusions 323 satisfies: 8≤N≤12. For example, the number of protrusions 323 can be 8, 9, 11 or 12, depending on the size of the electrochemical assembly 100.

[0090] In this embodiment, the multiple protrusions 323 can be evenly distributed, or the spacing between adjacent protrusions 323 can be different, both of which can achieve the effect of improving the sealing effect.

[0091] Among them, multiple protrusions 323 are all annular closed structures, and are arranged around the outside from the inside to the outside to realize a multi-bar sealing structure and improve the sealing effect.

[0092] In some embodiments, such as Figure 4 and Figure 5 As shown, the seal 32 includes a body 325 and a protrusion 323 disposed on the body 325. The thickness H1 of the body 325 satisfies: 3mm≤H1≤3.5mm.

[0093] For example, H1 can be 3mm, 3.2mm, 3.3mm, 3.4mm or 3.5mm to form an embedded structure with the membrane module 31.

[0094] In some embodiments, the height H2 of the protrusion 323 is 0.75mm ≤ H2 ≤ 1.5mm.

[0095] For example, H2 can be 0.75mm, 0.8mm, 1mm, 1.2mm or 1.5mm to reduce the gap between the pole frame and the seal 32 and enhance the sealing effect.

[0096] In some embodiments, the distance L1 between adjacent protrusions 323 satisfies 2mm≤L1≤5mm.

[0097] For example, L1 can be 2mm, 2.2mm, 2.5mm, 2.6mm, 3mm or 5mm, so as to provide better deformation avoidance space for the protrusion 323 and enhance the sealing effect.

[0098] In some embodiments, such as Figure 2 As shown, an auxiliary mounting part 324 is also provided on the outer side of the seal 32, and the auxiliary mounting part 324 protrudes from the outer side of the seal 32.

[0099] The auxiliary mounting parts 324 are located at the four corners of the seal 32.

[0100] During the installation of the electrolytic cell, the first pole frame 11 is fixedly installed first, and then the sealing isolation element 3 is positioned by grasping the protrusions on the four corners of the sealing element 32. Then the second pole frame 21 is installed and clamped in sequence.

[0101] In some embodiments, brackets 6 are provided on the outer sides of both the first pole frame 11 and the second pole frame 21. The brackets 6 are used to connect with fasteners of the electrolytic cell to assemble multiple electrochemical assemblies 100.

[0102] The following uses several specific embodiments to illustrate the structure of the sealing and isolation component 3 of this application.

[0103] Example 1, as Figure 3 , Figure 4 and Figure 5 As shown, the protrusion 323 on the surface of the seal 32 has a semi-circular cross-section. The seal 32 can be made of EPDM rubber. The thickness H1 of the body 325 of the seal 32 satisfies: 3mm ≤ H1 ≤ 3.5mm. Eight to twelve semi-circular protrusions 323 can be arranged to effectively seal the end face of the electrode frame. The height H2 of the semi-circular protrusions 323 is 0.75mm ≤ H2 ≤ 1mm, and the distance L1 between adjacent protrusions 323 satisfies 2mm ≤ L1 ≤ 3mm. An installation groove 321 is formed at the center of the inner side of the seal 32 near the electrolysis chamber. The depth W1 of the installation groove 321 is 1 / 3 to 2 / 3 of the width W of the seal 32, to improve the reliability of the membrane module 31 embedded inside the seal 32. Then, through a vulcanization process, the vulcanization temperature is controlled at 120-150℃, and the seal 32 and the membrane module 31 are vulcanized and connected as a whole, which enhances the interfacial bonding force between the seal 32 and the membrane module 31.

[0104] The sealing isolator 3 is sandwiched between the first electrode frame 11 and the second electrode frame 21. The upper and lower surfaces of the sealing element 32 are in contact with the surfaces of the electrode frames, respectively. The first electrode frame 11 and the second electrode frame 21 compress the sealing isolator 3, and a seal is formed between the sealing element 32 and the two electrode frames through the semi-circular protrusions 323, effectively reducing the possibility of alkali and gas leakage through the membrane module 31. At the same time, during the installation of the electrolytic cell plate and frame, the use of the sealing isolator 3, which is an integral part of the sealing element 32 and the membrane module 31, can reduce assembly steps, improve production efficiency, and reduce production costs.

[0105] Example 2, as Figure 6 , Figure 7 and Figure 8As shown, the cross-section of the protrusion 323 on the surface of the seal 32 is trapezoidal. The seal 32 can be a EPDM rubber component. The thickness H1 of the body 325 of the seal 32 satisfies: 3mm ≤ H1 ≤ 3.5mm. Eight to twelve trapezoidal protrusions 323 can be arranged to effectively seal the end face of the pole frame. The height H2 of the semi-circular protrusion 323 is 1mm ≤ H2 ≤ 1.5mm, the length of the upper base of the trapezoid is 1mm to 2mm, the width of the lower base is 2mm to 3mm, and the inclination angle is 20° to 25°, which reduces processing difficulty. The rounded corner radius is 0.5mm, which reduces stress concentration and installation damage. The spacing L1 between adjacent protrusions 323 satisfies 3mm ≤ L1 ≤ 5mm.

[0106] The sealing isolator 3 is sandwiched between the first electrode frame 11 and the second electrode frame 21. The upper and lower surfaces of the sealing element 32 are in contact with the surfaces of the electrode frames, respectively. The first electrode frame 11 and the second electrode frame 21 compress the sealing isolator 3, and a seal is formed between the sealing element 32 and the two electrode frames through the trapezoidal protrusions 323, effectively reducing the possibility of alkali and gas leakage through the membrane module 31. At the same time, during the installation of the electrolytic cell plate and frame, the use of the sealing isolator 3, which is an integral part of the sealing element 32 and the membrane module 31, can reduce assembly steps, improve production efficiency, and reduce production costs.

[0107] Example 3, as Figure 9 , Figure 10 and Figure 11 As shown, the protrusion 323 on the surface of the seal 32 has a rectangular cross-section. The seal 32 can be made of EPDM rubber. The thickness H1 of the body 325 of the seal 32 satisfies: 3mm ≤ H1 ≤ 3.5mm. Eight to twelve semi-circular protrusions 323 can be arranged to effectively seal the end face of the pole frame. The height H2 of the semi-circular protrusions 323 is 0.75mm ≤ H2 ≤ 1mm, the length of the long side of the rectangle is 1mm to 2mm, and the rounded corner radius is 0.5mm. This reduces stress concentration and installation damage. The spacing L1 between adjacent protrusions 323 satisfies 3mm ≤ L1 ≤ 5mm.

[0108] The sealing isolator 3 is sandwiched between the first electrode frame 11 and the second electrode frame 21. The upper and lower surfaces of the sealing element 32 are in contact with the surfaces of the electrode frames, respectively. The first electrode frame 11 and the second electrode frame 21 compress the sealing isolator 3, and a seal is formed between the sealing element 32 and the two electrode frames through the rectangular protrusions 323, effectively reducing the possibility of alkali and gas leakage through the membrane module 31. At the same time, during the installation of the electrolytic cell plate and frame, the use of the sealing isolator 3, which is an integral part of the sealing element 32 and the membrane module 31, can reduce assembly steps, improve production efficiency, and reduce production costs.

[0109] This application also provides an electrolytic cell, including end plates, pull rods, and a plurality of electrochemical assemblies 100 as described in any of the above embodiments. The plurality of electrochemical assemblies 100 are stacked and sandwiched between the end plates; the pull rods are connected between the end plates.

[0110] The electrolytic cell can be a square alkaline electrolytic cell.

[0111] The electrolytic cell provided in this application embodiment is equipped with an electrochemical assembly 100, in which the membrane module 31 and the sealing element 32 are connected as one unit. On the one hand, this enhances the interfacial bonding force between the membrane module 31 and the sealing element 32, improves the reliability of the connection between the membrane module 31 and the sealing element 32, and thus reduces the risk of liquid and gas leakage caused by aging and deformation of the membrane module 31. On the other hand, in the assembly process of the electrochemical assembly 100, the integrated design of the membrane module 31 and the sealing element 32 can reduce assembly steps, improve production efficiency, and reduce production costs.

[0112] This application also provides an electrolytic hydrogen production system, including a gas-liquid separator, a purification device, and an electrolytic cell as described in any of the above embodiments; the inlet of the gas-liquid separator is connected to the gas-liquid outlet of the electrolytic cell, and the return port of the gas-liquid separator is connected to the liquid inlet of the electrolytic cell; the inlet of the purification device is connected to the gas outlet of the gas-liquid separator.

[0113] The electrolytic hydrogen production system provided in this application embodiment has an electrolytic cell in which the membrane module 31 and the seal 32 are connected as a whole. On the one hand, this enhances the interfacial bonding force between the membrane module 31 and the seal 32 and improves the reliability of the connection between the membrane module 31 and the seal 32, thereby reducing the risk of liquid and gas leakage caused by aging and deformation of the membrane module 31. On the other hand, in the assembly process of the electrochemical assembly 100, the integrated design of the membrane module 31 and the seal 32 can reduce assembly steps, improve production efficiency, and reduce production costs.

[0114] This application also provides a hydrogen production station, including: an electrolytic hydrogen production system and a green power generation system as described in any of the above embodiments, wherein the green power generation system is electrically connected to the electrolytic hydrogen production system.

[0115] The electrolytic hydrogen production system provided in this application embodiment has an electrolytic cell in which the membrane module 31 and the seal 32 are connected as a whole. On the one hand, this enhances the interfacial bonding force between the membrane module 31 and the seal 32 and improves the reliability of the connection between the membrane module 31 and the seal 32, thereby reducing the risk of liquid and gas leakage caused by aging and deformation of the membrane module 31. On the other hand, in the assembly process of the electrochemical assembly 100, the integrated design of the membrane module 31 and the seal 32 can reduce assembly steps, improve production efficiency, and reduce production costs.

[0116] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0117] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0118] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0119] In the description of this application, "multiple" means two or more.

[0120] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0121] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0123] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrochemical assembly, characterized in that, include: The first pole assembly includes a first pole frame; The second pole assembly includes a second pole frame; A sealing isolation element includes a membrane assembly and a sealing element integrally connected, the sealing element being disposed around the membrane assembly, a first electrode assembly, the sealing isolation element and a second electrode assembly being sequentially stacked to form an anode chamber and a cathode chamber, the sealing element being sandwiched between the first electrode frame and the second electrode frame, and at least a portion of the membrane assembly being disposed between the anode chamber and the cathode chamber.

2. The electrochemical assembly according to claim 1, characterized in that, The seal has an inner groove, and at least a portion of the membrane assembly is located within the groove and is integrally connected to the inner wall of the groove.

3. The electrochemical assembly according to claim 2, characterized in that, The electrochemical assembly satisfies: 1 / 3W≤W1≤2 / 3W; where W1 is the depth of the mounting groove and W is the width of the seal from the inside to the outside.

4. The electrochemical assembly according to claim 1, characterized in that, The sealing element is provided with a first hole, and the membrane assembly is provided with a second hole. With the direction in which the first electrode assembly, the sealing and isolating element and the second electrode assembly are stacked in sequence as the projection direction, the projection of the first hole is located within the projection of the second hole.

5. The electrochemical assembly according to any one of claims 1-4, characterized in that, The membrane assembly is vulcanized and connected to the seal.

6. The electrochemical assembly according to claim 5, characterized in that, The vulcanization temperature T of the membrane assembly and the sealant satisfies: 120℃≤T≤150℃.

7. The electrochemical assembly according to any one of claims 1-4, characterized in that, The seal has at least one protrusion on its side along the thickness direction, and the protrusion is arranged around the center of the seal.

8. The electrochemical assembly according to claim 7, characterized in that, The protrusions include a plurality of protrusions, which are spaced apart and arranged around each other along the direction from the inside to the outside of the seal.

9. The electrochemical assembly according to claim 8, characterized in that, The number N of protrusions satisfies: 8≤N≤12.

10. The electrochemical assembly according to claim 7, characterized in that, The side of the protrusion facing away from the seal is arc-shaped; or, The cross-section of the protrusion is trapezoidal; or... The cross-section of the protrusion is rectangular.

11. An electrolytic cell, characterized in that, include: End plate; A plurality of electrochemical assemblies as described in any one of claims 1-10, wherein the plurality of electrochemical assemblies are stacked and sandwiched between the end plates; A tie rod is connected between the end plates.

12. An electrolytic hydrogen production system, characterized in that, include: The electrolytic cell as described in claim 11; The gas-liquid separator has its inlet connected to the gas-liquid outlet of the electrolytic cell and its return port connected to the liquid inlet of the electrolytic cell. The purification device has its inlet connected to the outlet of the gas-liquid separator.

13. A hydrogen production station, characterized in that, include: The electrolytic hydrogen production system as described in claim 12; A green power generation system, wherein the green power generation system is electrically connected to the electrolysis hydrogen production system.

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