Cell structure of electrolytic bath and electrolytic bath

Abstract

The utility model relates to the technical field of electrolytic baths, and provides an electrolytic bath small chamber structure and an electrolytic bath, the electrolytic bath small chamber structure comprises a bipolar plate, the bipolar plate comprises a first polar plate and a second polar plate, the surfaces of the first polar plate and the second polar plate are planes, a first electrode, a diaphragm and a second electrode are arranged between the first polar plate and the second polar plate, a first supporting piece is arranged between the first electrode and the first polar plate, and a second supporting piece is arranged between the second electrode and the second polar plate; the bipolar plate provided by the utility model adopts a straight plate design, compared with a traditional polar plate with mastoid processes, secondary processing is not needed, the phenomenon of gas channeling between the cathode and the anode caused by the fact that the diaphragm is punctured by the electrode can be prevented, the first supporting piece is arranged to provide supporting force, the contact with the first electrode is enhanced, and the service life of the bipolar plate is prolonged. The second supporting piece is arranged to provide supporting force, the contact with the second electrode is enhanced, the distance between the two electrodes and the diaphragm is reduced, and the membrane polar distance is favorably realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic cell technical field especially relates to a electrolytic cell chamber structure and electrolytic cell. BACKGROUND

[0002] Hydrogen energy is a kind of secondary energy with abundant source, clean and high efficiency, can help to consume wind, light and other renewable energy, realizes more efficient energy utilization, and there are three ways for water electrolysis hydrogen production: alkaline water electrolysis hydrogen production, proton exchange membrane water electrolysis hydrogen production and high-temperature solid oxide water electrolysis hydrogen production, wherein alkaline water electrolysis hydrogen production is the most mature and highest economic technology in current commercial application.

[0003] The currently commercial alkaline electrolytic cell is mostly filter-pressing type electrolytic cell, which is composed of several electrolytic cell chambers. The electrolytic cell chamber usually contains cathode, anode, diaphragm, bipolar plate, gasket and the like. The bipolar plate, as the main supporting structure, is composed of pole frame and pole plate. The pole frame is provided with gas-liquid passage, and the pole plate is provided with papillary flow field punched out, which is convenient for fluid dispersion.

[0004] However, in a large number of electrolytic cell applications, the papillary flow field gradually exposes some defects, mainly including: the papillary protrusions on the pole plate can support the electrode, and the two are in rigid contact, and the papillary structure is assembled in top-to-top mode, which has high assembly positioning requirements. In order to avoid the diaphragm being pierced due to the misalignment of top-to-top assembly, the distance between the electrode and the diaphragm cannot realize the membrane electrode distance (i.e. the distance between the cathode and the anode is only the thickness of the diaphragm without gap), which will cause high internal resistance of the electrolytic cell and high power consumption. Secondly, the papillary flow field is complex to process, and the cost of opening the mold is high. Limited by the width of the pole plate raw material, the punching characteristics of the papillary plate and the mold processing, the number of papillae that can be processed in unit area is limited, which leads to limited contact area of the pole plate and the electrode, and the electrolytic cell is difficult to achieve higher current density. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of electrolytic cell chamber structure and electrolytic cell to solve the defect of high assembly difficulty and low electrolysis efficiency caused by papillary protrusions on the pole plate in prior art.

[0006] The utility model provides a kind of electrolytic cell chamber structure, comprising: bipolar plate, the bipolar plate includes first pole plate and second pole plate, the surface of the first pole plate and the second pole plate is plane, first electrode, diaphragm and second electrode are arranged between the first pole plate and the second pole plate, first support is arranged between the first electrode and the first pole plate, second support is arranged between the second electrode and the second pole plate.

[0007] According to the electrolytic cell chamber structure provided by the utility model, first pole frame is arranged around the edge of the first pole plate, and second pole frame is arranged around the edge of the second pole plate.

[0008] According to the electrolytic cell chamber structure, the first support member is an elastic support member, and the second support member is a support net.

[0009] According to the electrolytic cell chamber structure, the first support member is a support net, and the second support member is an elastic support member.

[0010] According to the electrolytic cell chamber structure, a gasket is arranged between the first pole frame and the second pole frame, and an outer edge of the diaphragm is connected with the gasket.

[0011] According to the electrolytic cell chamber structure, first gas-liquid hole channels and first alkali liquid hole channels are arranged on both sides of the first pole frame along a first direction, and a first flow channel is further arranged on the first pole frame inside the first pole plate along a second direction, and the first flow channel is in communication with the first gas-liquid hole channels and the first alkali liquid hole channels respectively.

[0012] According to the electrolytic cell chamber structure, second gas-liquid hole channels and second alkali liquid hole channels are arranged on both sides of the second pole frame along a first direction, and a second flow channel is further arranged on the second pole frame inside the second pole plate along a second direction, and the second flow channel is in communication with the second gas-liquid hole channels and the second alkali liquid hole channels respectively.

[0013] According to the electrolytic cell chamber structure, the mesh of the support net is a rhombus, a square or a hexagon.

[0014] According to the electrolytic cell chamber structure, the elastic support member is one of an elastic wire net, a spring or an elastic corrugated sheet.

[0015] In the second aspect, the utility model also provides an electrolytic cell which comprises the electrolytic cell chamber structure as described in the first aspect.

[0016] The utility model provides a kind of electrolytic cell chamber structure, comprising: bipolar plate, bipolar plate includes first polar plate and second polar plate, the surface of first polar plate and second polar plate is plane, first polar plate and second polar plate between being provided with first electrode, diaphragm and second electrode, first electrode and first polar plate between being provided with first support piece, second electrode and second polar plate between being provided with second support piece;Such setting, bipolar plate uses straight plate design, relative to traditional polar plate with papilla, no longer need to carry out secondary processing, reduce processing difficulty and cost, and can prevent diaphragm be punctured by electrode and cause the occurrence of cathode and anode gas mutual interflow phenomenon, by setting first support piece provides support force, enhance and the contact of first electrode, by setting second support piece provides support force, enhance and the contact of second electrode, and realize the distance between two electrodes and diaphragm is reduced, it is favorable to realize membrane electrode distance, i. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will be a brief introduction to the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0018] Figure 1 It is a kind of electrolytic cell chamber structure structural schematic diagram provided by the utility model embodiment.

[0019] Reference signs:

[0020] 1, first polar plate;11, first polar frame;111, first gas-liquid hole channel;112, first lye channel;12, first flow channel;

[0021] 2, second polar plate;21, second polar frame;211, second gas-liquid hole channel;212, second lye channel;22, second flow channel;

[0022] 3, first electrode;4, diaphragm;5, second electrode;

[0023] 6, first support piece;7, second support piece;8, gasket. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be clearly and completely described below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] The utility model discloses a kind of electrolytic cell cell structure and electrolytic cell. Figure 1 The utility model discloses a kind of electrolytic cell cell structure and electrolytic cell.

[0026] The utility model discloses a kind of electrolytic cell cell structure, comprising: bipolar plate, bipolar plate includes first polar plate 1 and second polar plate 2, the surface of first polar plate 1 and second polar plate 2 are plane, first polar plate 1 with second polar plate 2 between being provided with first electrode 3, diaphragm 4 and second electrode 5, first electrode 3 is anode, second electrode 5 is cathode, cathode electrode and anode electrode are separated with diaphragm 4, first electrode 3 with first polar plate 1 between being provided with first support 6, second electrode 5 with second polar plate 2 between being provided with second support 7.

[0027] Through the above scheme, the utility model discloses that the bipolar plate adopts straight plate design, compared with traditional polar plate with papilla, without again carrying out secondary processing, reduce processing difficulty and cost, and the phenomenon that anode and cathode gas mutual penetration caused by diaphragm 4 being punctured by electrode can be prevented, by setting first support 6 provides support force, and enhances the contact with first electrode 3, by setting second support 7 provides support force, and enhances the contact with second electrode 5, and realizes the distance between two electrodes and diaphragm 4 is reduced, is favorable for realizing membrane electrode distance, that is, the distance between cathode and anode is only the thickness of diaphragm 4, can effectively reduce electrolytic cell internal resistance, reduces cell voltage, to reach the purpose of improving electrolytic efficiency.

[0028] In the embodiment, first support 6 is support net, that is, support net is arranged between anode and first polar plate 1, and the support net can be punching and drawing net, for example, the metal mesh sheet such as steel plate, aluminum plate etc. with specific mesh shape and aperture formed by punching and stretching process, by placing support net on plane polar plate, support net can play the role of supporting anode, and can form line or surface contact with anode after electrolytic cell is tightened, convenient for gas and liquid transmission, compared with traditional polar plate papilla structure, the conductive area increases, and current distribution is more uniform, and also can bear higher current density.

[0029] Optionally, the mesh hole of the support net is not limited to rhombus, square or hexagon.

[0030] As Figure 1As shown, the second support 7 is an elastic support, that is, an elastic support is arranged between the cathode and the cathode plate second pole plate 2 to support the cathode, and the elastic support is adopted to increase the elastic support between the cathode and the cathode plate, increase the contact area with the cathode, and after tightening, the elastic support can press the cathode and the anode and the diaphragm 4, reduce the distance between the electrode and the diaphragm 4, form a membrane electrode distance, and bear higher current density; since the elastic support has elasticity, the thickness under stress can be changed, the machining tolerance of the remaining parts can be effectively absorbed, the distance in the small chamber is reduced, the internal resistance of the electrolytic cell is reduced, and the elastic net can be compressed after tightening to be in close contact with the cathode, and the conductive area is increased.

[0031] Optionally, the elastic support can be one of an elastic wire mesh, a spring or an elastic corrugated sheet, the elastic wire mesh is woven into a flat mesh by metal wires, and then a corrugated structure is formed by stamping, the elastic corrugated sheet is in the form of a perforated corrugated sheet, has a corrugated structure, and has hole eyes distributed on the perforated corrugated sheet, so that gas and liquid can be transmitted.

[0032] In some embodiments, the first support 6 is an elastic support, and the second support 7 is a support net, that is, an elastic support is arranged on the anode side, and a support net is arranged on the cathode side, and the same technical effects can be achieved, which will not be described again.

[0033] The utility model discloses a first support 6 and second support 7 press the electrode more tightly on the diaphragm 4 two sides, form more reliable multi-point electric contact, thereby make the current density distribution on cathode plate and anode plate in electrolytic process more uniform, finally reach the purpose of reducing small chamber cell voltage, improving electrolytic cell efficiency.

[0034] In the embodiment, a first pole frame 11 is arranged around the edge of the first pole plate 1, a second pole frame 21 is arranged around the edge of the second pole plate 2, a gasket 8 is arranged between the first pole frame 11 and the second pole frame 21, and the outer edge of the diaphragm 4 is connected with the gasket 8.

[0035] In the embodiment, the first pole frame 11 is provided with a first gas-liquid hole channel 111 and a first lye hole channel 112 on both sides along a first direction, and the first pole frame 11 located on the inner side of the first pole plate 1 is further provided with a first flow channel 12 along a second direction, and the first flow channel 12 is in communication with the first gas-liquid hole channel 111 and the first lye hole channel 112 respectively; the second pole frame 21 is provided with a second gas-liquid hole channel 211 and a second lye hole channel 212 on both sides along a first direction, and the second pole frame 21 located on the inner side of the second pole plate 2 is further provided with a second flow channel 22 along a second direction, and the second flow channel 22 is in communication with the second gas-liquid hole channel 211 and the second lye hole channel 212 respectively, wherein the first direction can be a direction perpendicular to the pole plate, that is, a thickness direction, the second direction is a direction parallel to the pole plate, and the first direction and the second direction are perpendicular to each other.

[0036] AsFigure 1 As shown, the first gas-liquid channel 111 is arranged above the first electrode frame 11, and the second gas-liquid channel 211 is arranged above the second electrode frame 21, the first gas-liquid channel 111 and the second gas-liquid channel 211 are used for flowing of the generated hydrogen gas, oxygen gas and alkali liquid mixture, the first gas-liquid channel 111 and the second gas-liquid channel 211 are arranged on both sides of the gasket 8 arranged above, the first alkali liquid channel 112 is arranged below the first electrode frame 11, and the second alkali liquid channel 212 is arranged below the second electrode frame 21, the first alkali liquid channel 112 and the second alkali liquid channel 212 are arranged on both sides of the gasket 8 arranged below.

[0037] In work, the alkali liquid enters from the lower liquid inlet, and then enters the electrolytic cell chamber from the first alkali liquid channel 112 and the second alkali liquid channel 212 respectively, the electrolyte is subjected to electrolysis reaction on the surface of the cathode and the anode, hydrogen gas and oxygen gas are generated, the mixed alkali liquid flows into the first gas-liquid channel 111 and the second gas-liquid channel 211 of the two electrode frames from the flow channel arranged above, and is discharged from the electrolytic cell.

[0038] The embodiment further discloses an electrolytic cell comprising the electrolytic cell chamber structure, and has all the advantages of the electrolytic cell chamber structure, which will not be repeated here, when the electrolytic cell is assembled, the plurality of chambers are stacked, and the gas-liquid flowing space is formed between the two electrode plates.

[0039] In the description of the embodiments of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as the limitation of the embodiments of the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0041] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "aspects", "specific aspects", or "some aspects" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or aspect are included in at least one embodiment or aspect of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or aspect. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or aspects. In addition, those skilled in the art can combine and combine the features of different embodiments or aspects described in the present application and the characteristics of different embodiments or aspects without contradiction.

[0042] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrolyser cell structure, characterised in that, The application relates to a bipolar plate, which comprises a first polar plate (1) and a second polar plate (2), the surfaces of the first polar plate (1) and the second polar plate (2) are planes, a first electrode (3), a diaphragm (4) and a second electrode (5) are arranged between the first polar plate (1) and the second polar plate (2), a first supporting piece (6) is arranged between the first electrode (3) and the first polar plate (1), and a second supporting piece (7) is arranged between the second electrode (5) and the second polar plate (2). A first polar frame (11) is arranged around the edge of the first polar plate (1), and a second polar frame (21) is arranged around the edge of the second polar plate (2).

2. The electrolyzer cell structure of claim 1, wherein, The first supporting piece (6) is an elastic supporting piece, and the second supporting piece (7) is a supporting net.

3. The electrolyzer cell structure of claim 1, wherein, The first supporting piece (6) is a supporting net, and the second supporting piece (7) is an elastic supporting piece.

4. The electrolyzer cell structure of claim 1, wherein, A gasket (8) is arranged between the first polar frame (11) and the second polar frame (21), and the outer edge of the diaphragm (4) is connected with the gasket (8).

5. The electrolyzer cell structure of claim 2, wherein, First gas-liquid hole channels (111) and first lye hole channels (112) are arranged on the two sides of the first polar frame (11) along a first direction, and a first flow channel (12) is further arranged on the first polar frame (11) on the inner side of the first polar plate (1) along a second direction, and the first flow channel (12) is in communication with the first gas-liquid hole channels (111) and the first lye hole channels (112) respectively.

6. The electrolyzer cell structure of claim 2, wherein, Second gas-liquid hole channels (211) and second lye hole channels (212) are arranged on the two sides of the second polar frame (21) along a first direction, and a second flow channel (22) is further arranged on the second polar frame (21) on the inner side of the second polar plate (2) along a second direction, and the second flow channel (22) is in communication with the second gas-liquid hole channels (211) and the second lye hole channels (212) respectively.

7. The electrolyzer cell structure of claim 6, wherein, The meshes of the supporting net are rhombic, square or hexagonal.

8. An electrolyser cell structure according to claim 3 or 4, wherein, The elastic supporting piece is one of an elastic wire net, a spring or an elastic corrugated sheet.

9. An electrolyser cell structure according to claim 3 or 4, wherein, The application further relates to an electrolytic cell comprising the cell structure as claimed in any one of claims 1-9.

10. An electrolytic cell characterized in that, ​

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