Polar plate assembly and electrolytic bath

Abstract

The utility model discloses a pole plate assembly and an electrolytic bath, and relates to the technical field of electrolysis, the pole plate assembly comprises a bipolar plate, two electrode parts and a diaphragm, the bipolar plate comprises a main pole plate and a pole frame arranged on the periphery of the main pole plate in a surrounding mode, and the two electrode parts abut against the two axial sides of the main pole plate respectively; each electrode piece is fixedly connected to the bipolar plate, the two electrode pieces are respectively configured to be an anode piece and a cathode piece, and the diaphragm covers one side, deviating from the main polar plate, of one electrode piece and is fixedly connected to the electrode frame. The utility model aims to improve the assembling efficiency and the finished product yield of the electrolytic cell.

Description

Technical Field

[0001] The present application relates to the field of electrolysis technology, and in particular to a polar plate assembly and an electrolytic cell. Background Art

[0002] At present, the mainstream assembly method of the electrolyzer is: first place an end pressure plate horizontally in the electrolyzer assembly pit, then stack the insulating plate, end plate, anode, diaphragm, insulating gasket, cathode, bipolar plate, etc. upward in sequence, cap the top with the end pressure plate, and finally lock it with a tie rod. However, this method has low assembly efficiency, and because the diaphragm is soft in texture, wrinkles are easy to appear when laying the diaphragm. Utility Model Content

[0003] The main purpose of this application is to propose a plate assembly and an electrolytic cell, aiming to improve the assembly efficiency and finished product yield of the electrolytic cell.

[0004] To achieve the above objectives, the electrode plate assembly proposed in this application includes:

[0005] A bipolar plate, comprising a main polar plate and a polar frame arranged around the outer periphery of the main polar plate;

[0006] Two electrode members are respectively abutted against two axial sides of the main electrode plate, and each of the electrode members is fixedly connected to the bipolar plate; wherein the two electrode members are respectively configured as an anode member and a cathode member;

[0007] The diaphragm is covered on a side of one of the electrode members away from the main electrode plate and is fixedly connected to the electrode frame.

[0008] In one embodiment, the electrode member is connected to the bipolar plate by welding.

[0009] In one embodiment, the electrode member is connected to the main electrode plate and / or the electrode frame by spot welding.

[0010] In one embodiment, the electrode plate assembly further includes a fixing member, and the outer periphery of the diaphragm is sandwiched between the electrode frame and the fixing member.

[0011] In one embodiment, a fixing annular groove is recessed on the pole frame and surrounds the main pole plate, the fixing member is accommodated in the fixing annular groove, and the outer periphery of the diaphragm is sandwiched between the groove wall of the fixing annular groove and the fixing member.

[0012] In one embodiment, the fixing member is configured as an elastic member, and the fixing member clamps the diaphragm tightly onto the inner circumferential wall of the fixing ring groove.

[0013] In one embodiment, the fixing member abuts against an outer peripheral wall of the fixing ring groove.

[0014] In one embodiment, the outer circumference of the diaphragm covers the entire bottom of the fixing ring groove.

[0015] In one embodiment, the cross-section of the fixing ring groove has equal width in the groove depth direction.

[0016] In one embodiment, the cross section of the fixing ring groove gradually contracts or expands in a direction approaching the groove opening.

[0017] In one embodiment, the cross section of the fixing ring groove is a polygon with one side open.

[0018] In one embodiment, the cross section of the fixing ring groove is in a major arc shape or a minor arc shape.

[0019] In one embodiment, the cross-sectional shape of the fixing member is adapted to the cross-sectional shape of the fixing ring groove.

[0020] In one embodiment, a side surface of the fixing member exposed from the notch of the fixing ring groove is flush with the outer surface of the pole frame and the outer surface of the diaphragm.

[0021] The present application also proposes an electrolytic cell, comprising the aforementioned electrode plate assembly, wherein the electrolytic cell comprises a plurality of stacked electrode plate assemblies, wherein the diaphragm of each electrode plate assembly is covered on the anode component or the cathode component, and every two adjacent electrode plate assemblies are separated by a diaphragm.

[0022] In the technical solution of the present application, by fixing the anode and cathode parts on the bipolar plate, and fixing the diaphragm on the pole frame, an integrated substrate assembly is formed. The plate assembly can be purchased from outside. When assembling the electrolytic cell, the integrated plate assembly can be directly installed, which can greatly save the operation process, thereby improving the assembly efficiency of the electrolytic cell. In addition, since the diaphragm is fixed on the pole frame, when installing the electrolytic cell, the diaphragm is not easy to be displaced or wrinkled. In addition, the electrode parts are also fixed on the bipolar plate, and the electrode parts are not easy to shift, thereby ensuring the finished product yield of the electrolytic cell. On this basis, when designing the plate assembly, the electrode parts covered by the diaphragm are fixed as anode parts or cathode parts. In this way, when installing, the direction of the plate assembly can be distinguished by the diaphragm, and the plate assembly can be more conveniently loaded into the electrolytic cell, which is conducive to further improving the assembly efficiency of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some 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 paying any creative work.

[0024] Figure 1 A schematic structural diagram of an embodiment of a plate assembly provided in this application;

[0025] Figure 2 A partial structural cross-sectional view of an embodiment of a bipolar plate in a plate assembly provided in the present application;

[0026] Figure 3 A partial structural cross-sectional view of an embodiment of a plate assembly provided in the present application.

[0027] Description of Figure Numbers:

[0028] 100, bipolar plate; 110, main electrode plate; 120, electrode frame; 121, fixed ring groove; 200, electrode member; 300, diaphragm; 400, fixing member.

[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] The present application provides a plate assembly.

[0034] See also Figures 1 to 3 In one embodiment of the present application, the plate assembly includes:

[0035] The bipolar plate 100 includes a main polar plate 110 and a polar frame 120 surrounding the outer periphery of the main polar plate 110;

[0036] Two electrode members 200 are respectively abutted against two axial sides of the main electrode plate 110, and each of the electrode members 200 is fixedly connected to the bipolar plate 100; wherein the two electrode members are respectively configured as an anode member and a cathode member;

[0037] The diaphragm 300 is covered on a side of one of the electrode members 200 away from the main electrode plate 110 , and is fixedly connected to the electrode frame 120 .

[0038] In the technical solution of the present application, by fixing the anode and cathode components on the bipolar plate 100, the diaphragm 300 is fixed on the pole frame 120 to form an integrated substrate assembly, the plate assembly can be purchased from outside, and when assembling the electrolytic cell, the integrated plate assembly can be directly installed, which can greatly save the operation process, thereby improving the assembly efficiency of the electrolytic cell. In addition, since the diaphragm 300 is fixed on the pole frame 120, when installing the electrolytic cell, the diaphragm 300 is not easy to be displaced, nor is it easy to produce wrinkles. In addition, the electrode component 200 is also fixed on the bipolar plate 100, and the electrode component 200 is not easy to shift, thereby ensuring the finished product yield of the electrolytic cell. On this basis, when designing the plate assembly, the electrode component 200 covered by the diaphragm 300 is fixed as an anode component or a cathode component. In this way, when installing, the direction of the plate assembly can be distinguished by the diaphragm 300, and the plate assembly can be more conveniently loaded into the electrolytic cell, which is conducive to further improving the assembly efficiency of the electrolytic cell.

[0039] Specifically, the electrode member 200 is in a mesh shape, which can significantly increase the effective working area of ​​the electrode member 200, which helps to improve the electrolysis efficiency. A larger surface area means that the reactants have more opportunities to contact the surface of the electrode member 200, thereby accelerating the electrochemical reaction rate. During the electrolysis process, gases (such as hydrogen and oxygen) will be generated on the cathode and anode. The electrode member 200 with a mesh structure facilitates the formation and detachment of bubbles, reduces the accumulation of bubbles on the surface of the electrode member 200, and prevents the bubble shielding effect, which will hinder the effective contact between the electrolyte and the electrode and reduce the electrolysis efficiency. The electrode member 200 with a mesh structure can also promote the flow of electrolyte around the electrode, which helps the mass transfer process, that is, the transfer of reactants to the surface of the electrode member 200 and the removal of products from the surface of the electrode member 200, which is crucial to maintaining an efficient electrolysis reaction. In some applications, the electrode member 200 with a mesh structure can also provide the necessary mechanical strength, especially when dealing with high current density or highly corrosive electrolytes, to ensure the stability and durability of the electrode member 200.

[0040] The diaphragm 300 allows the ions in the electrolyte to pass freely, thereby migrating from one electrode to the other under the action of the electric field to complete the electrochemical reaction. The diaphragm 300 can effectively isolate the hydrogen and oxygen produced by the electrocatalytic process, ensure that they are generated in their respective electrode areas and prevent mixing, which is crucial to maintaining safe operation and improving the purity of gas products. Under dynamic operating conditions, the diaphragm 300 helps to balance the pressure fluctuations in different areas of the electrolyzer, especially when the hydrogen and oxygen generation rates are inconsistent, to prevent gas cross-talk caused by pressure differences. The diaphragm 300 of the electrolyzer also plays a role in physically separating the anode and cathode, preventing short circuits caused by direct contact between the two electrodes, and ensuring that the current is transmitted only through the ions in the electrolyte. The diaphragm 300 sometimes also needs to assist in thermal management, such as helping to dissipate the heat generated by the reaction through the thermal conductivity of its material to maintain the stability of the temperature inside the electrolyzer.

[0041] In one embodiment, the electrode member 200 is connected to the bipolar plate 100 by welding. In this way, the electrode member 200 and the bipolar plate 100 can be fixed to avoid displacement of the electrode member 200 during installation, which affects the overall performance of the finished electrolyzer. In addition, welding can provide a high-strength mechanical connection to ensure that the electrode mesh and the bipolar plate 100 are stable and do not fall off during the operation of the electrolyzer, and withstand the gas pressure, stress caused by liquid flow, and long-term thermal cycle loads. The welding point can maintain good electrical contact and reduce resistance, which is crucial for the efficient transfer of electrons between the electrode mesh and the bipolar plate 100, and helps to improve the overall performance and efficiency of the electrolyzer. Of course, in other ways, the electrode member 200 can also be bonded to the bipolar plate 100 by conductive adhesive.

[0042] In one embodiment, the electrode member 200 is connected to at least one of the main pole plate 110 and the pole frame 120 by spot welding. Specifically, the outer periphery of the electrode member 200 may be connected to the inner periphery of the pole frame 120 by spot welding to achieve a fixed connection between the electrode member 200 and the bipolar plate 100; or the surface of the electrode member 200 may be connected to the surface of the bipolar plate 100 by spot welding. It can be understood that the main pole plate 110 is alternately formed with boss structures on both sides of the surface in sequence for the electrode members 200 on both sides to abut against. When the electrode member 200 is welded and fixed to the main pole plate 110, the welding point will also be formed at the boss.

[0043] In one embodiment, the pole plate assembly further includes a fixing member 400, and the periphery of the diaphragm 300 is clamped between the pole frame 120 and the fixing member 400. It can be understood that the diaphragm 300 is soft, and if it is to be directly fixed on the pole frame 120, it is inconvenient to operate, and it is easy to cause wrinkles on the diaphragm 300. In this embodiment, the diaphragm 300 can be indirectly fixed by the fixing member 400, which is conducive to improving the convenience of operation and ensuring the fixing stability of the diaphragm 300. Of course, in other embodiments, it is also possible to tighten the diaphragm by other tooling to ensure that there are no wrinkles, and then directly bond or weld the diaphragm 300 to the pole frame 120.

[0044] In one embodiment, the pole frame 120 is provided with a fixing annular groove 121 surrounding the main pole plate 110, the fixing member 400 is accommodated in the fixing annular groove 121, and the outer periphery of the diaphragm 300 is clamped between the groove wall of the fixing annular groove 121 and the fixing member 400. It should be noted that the fixing annular groove 121 is not limited to a circular ring shape, and can also be a square ring shape or other polygonal ring shape. In this way, the fixing effect of the fixing member 400 on the diaphragm 300 can be improved, and at the same time, the fixing member 400 will not protrude from the surface of the pole frame 120, and will not cause interference when multiple pole plate assemblies are stacked.

[0045] In one embodiment, the fixing member 400 is configured as an elastic member, and the fixing member 400 clamps the diaphragm 300 on the inner peripheral wall of the fixing ring groove 121. In this way, the diaphragm 300 can be effectively and stably fixed by the elastic force of the fixing member 400, and it is also beneficial to tighten the diaphragm 300 to ensure the working performance of the diaphragm 300. Further, the fixing member 400 abuts against the outer peripheral wall of the fixing ring groove 121, so that the fixing member 400 can be installed in the fixing ring groove 121 in an adaptive or interference fit, which is beneficial to ensure the installation stability of the fixing member 400 and the fixing effect of the fixing member 400 on the diaphragm 300.

[0046] In one embodiment, the outer circumference of the diaphragm 300 covers the bottom of the fixing ring groove 121. In this way, a sufficient area of ​​the diaphragm 300 can be clamped to ensure the fixing stability of the diaphragm 300.

[0047] It should be noted that the cross-sectional shape of the fixing annular groove 121 is not limited, and can satisfy the stable installation of the fixing member 400. At the same time, there can be enough area for the diaphragm 300 to be laid, so that a sufficient area of ​​the diaphragm 300 can be clamped to ensure the fixing stability of the diaphragm 300. On this basis, the cross-sectional shape of the fixing member 400 is adapted to the cross-sectional shape of the fixing annular groove 121, which can facilitate the installation of the fixing member 400, and is conducive to ensuring the installation stability of the fixing member 400, and is conducive to the fixing member 400 to stably fix the diaphragm 300 on the pole frame 120.

[0048] In one embodiment, the cross section of the fixing ring groove 121 has equal width in the groove depth direction, so as to facilitate the processing of the fixing ring groove 121 and the installation of the fixing member 400 .

[0049] In one embodiment, the cross section of the fixing annular groove 121 gradually shrinks or expands in the direction close to the notch. When the cross section of the fixing annular groove 121 gradually shrinks in the direction close to the notch, the fixing member 400 is not easy to fall out of the notch after being inserted into the fixing annular groove 121, which is conducive to ensuring the fixing stability of the diaphragm 300; when the cross section of the fixing annular groove 121 gradually expands in the direction close to the notch, it is easy for the fixing member 400 to be inserted into the fixing annular groove 121.

[0050] In one embodiment, the cross section of the fixing ring groove 121 is a polygon with one side open. Specifically, it can be a triangle, a quadrilateral, a pentagon, etc. with one side open.

[0051] In one embodiment, the cross section of the fixing ring groove 121 is in a major arc shape or a minor arc shape. It can be understood that the major arc is an arc with a central angle greater than 180 degrees, and the minor arc is an arc with a central angle less than 180 degrees.

[0052] In one embodiment, the surface of one side of the fixing member 400 exposed in the notch of the fixing ring groove 121 is flush with the outer surface of the pole frame 120 and the outer surface of the diaphragm 300. It can be understood that the outer surface of the pole frame 120 and the outer surface of the diaphragm 300 mentioned here refer to the surface exposed on this side. On this side, the surface of the fixing member 400, the surface of the pole frame 120 and the surface of the diaphragm 300 are all arranged flush, so that the surface of the electrode assembly is flat, and when multiple electrode assemblies are stacked, it can save more space and the structure is more stable. Among them, the pole frame 120 is formed with an accommodating space on the inner side of the fixing ring groove 121 for accommodating the diaphragm 300, so as to ensure that the outer surface of the diaphragm 300 is flush with the outer surface of the pole frame 120 on the outer side of the fixing ring groove 121.

[0053] The present application also proposes an electrolytic cell, which includes a plate assembly. The specific structure of the plate assembly refers to the above-mentioned embodiment. Since the electrolytic cell adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0054] Specifically, the electrolytic cell includes a plurality of stacked electrode plate assemblies, the diaphragm of each electrode plate assembly is covered on the anode component or the cathode component, and every two adjacent electrode plate assemblies are separated by a diaphragm. In this way, the working performance of the electrolytic cell is improved. In addition, the two adjacent electrode plate assemblies are separated by an insulating gasket, which is arranged on the same side of the diaphragm and is arranged outside the diaphragm to isolate the area on the electrode frame that is not covered by the diaphragm.

[0055] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A plate assembly, characterized in that: include: A bipolar plate, comprising a main polar plate and a polar frame arranged around the outer periphery of the main polar plate; Two electrode members are respectively abutted against two axial sides of the main electrode plate, and each of the electrode members is fixedly connected to the bipolar plate; wherein the two electrode members are respectively configured as an anode member and a cathode member; The diaphragm is covered on a side of one of the electrode members away from the main electrode plate and is fixedly connected to the electrode frame.

2. The electrode plate assembly according to claim 1, characterized in that: The electrode member is connected to the bipolar plate by welding.

3. The electrode plate assembly according to claim 2, characterized in that: The electrode member is connected to the main pole plate and / or the pole frame by spot welding.

4. The electrode plate assembly according to any one of claims 1 to 3, characterized in that: The pole plate assembly further includes a fixing member, and the outer periphery of the diaphragm is sandwiched between the pole frame and the fixing member.

5. The electrode plate assembly according to claim 4, characterized in that: The pole frame is provided with a fixing ring groove surrounding the main pole plate, the fixing member is accommodated in the fixing ring groove, and the outer periphery of the diaphragm is sandwiched between the groove wall of the fixing ring groove and the fixing member.

6. The electrode plate assembly according to claim 5, characterized in that: The fixing member is configured as an elastic member, and the fixing member clamps the diaphragm tightly on the inner peripheral wall of the fixing ring groove.

7. The electrode plate assembly according to claim 6, characterized in that: The fixing piece abuts against the outer peripheral wall of the fixing ring groove.

8. The electrode plate assembly according to claim 5, characterized in that: The outer periphery of the diaphragm covers the bottom of the fixed ring groove; And / or, the cross section of the fixing ring groove has equal width in the groove depth direction, or, the cross section of the fixing ring groove gradually shrinks or expands in the direction close to the groove opening, or, the cross section of the fixing ring groove is a polygon with one side open, or, the cross section of the fixing ring groove is a major arc shape or a minor arc shape; And / or, the cross-sectional shape of the fixing member is adapted to the cross-sectional shape of the fixing ring groove.

9. The electrode plate assembly according to claim 5, characterized in that: A side surface of the fixing member exposed from the notch of the fixing ring groove is flush with the outer surface of the pole frame and the outer surface of the diaphragm.

10. An electrolytic cell, characterized in that: The electrolytic cell comprises a plurality of stacked electrode plate assemblies, the diaphragm of each electrode plate assembly is covered on the anode member or the cathode member, and every two adjacent electrode plate assemblies are separated by a diaphragm.

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