Small chamber component structure for improving efficiency of high-pressure alkaline water electrolytic bath

Abstract

The utility model relates to a small chamber internal part structure for improving the efficiency of a high-voltage alkaline water electrolytic bath. The internal part structure comprises a pole frame, a bipolar plate, an electrode, a diaphragm, a gasket and an elastic element, an electrode plate is arranged in the electrode frame, the electrode comprises an anode and a cathode, and the electrode plate, the anode, the diaphragm, the cathode and the electrode plate are stacked in sequence; the electrode plate is provided with a one-way mastoid structure facing one electrode to serve as a rigid support, the one-way mastoid structure forms a concave structure on the other side of the electrode plate, an elastic element is arranged between the concave structure of the electrode plate and the other electrode to serve as a flexible support, and the elastic element and the mastoid structure press and attach the electrodes to the two sides of the diaphragm. Compared with the prior art, the contact between the polar plates and the electrodes and the contact between the electrodes and the diaphragms are increased, so that the compact structure of the electrolytic cell is ensured, the cell pressure of the small electrolytic chamber is reduced, the elasticity of the whole structure is enhanced, and cathode and anode gas channeling caused by the fact that the diaphragms are punctured is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production by alkaline water electrolysis, and relates to a small indoor component structure for improving the efficiency of a high-pressure alkaline water electrolysis cell. Background Art

[0002] In recent years, hydrogen has attracted much attention as an energy carrier with broad application prospects and an important raw material for industrial production. The production of green hydrogen by water electrolysis driven by renewable energy is a clean and sustainable energy conversion technology.

[0003] The electrolyzer is the key to achieve the conversion of "electrical energy to chemical energy". According to the different materials of the electrolyzer diaphragm, the mainstream electrolyzers in the industry can be divided into three categories: alkaline water electrolyzer, proton exchange membrane water electrolyzer and high-temperature solid oxide electrolyzer. Among them, alkaline water electrolysis technology is the longest-developed and most mature water electrolysis hydrogen production technology, with the advantages of simple operation and low cost. Alkaline water electrolysis technology uses potassium hydroxide (KOH) or sodium hydroxide (NaOH) aqueous solution as electrolyte, and electrolyzes water under the action of direct current to produce hydrogen and oxygen at the cathode and anode respectively.

[0004] The high-pressure alkaline water electrolyzer commonly used in industry at present is a filter press electrolyzer, which contains multiple superimposed electrolytic units to form a bipolar electrolyzer structure, which has the advantages of compact structure and simple gas-liquid circulation channel structure, and the working pressure can reach 0.1-5.0MPa. The cell pressure of the small chamber is the main indicator to measure the overall energy consumption of the electrolyzer, which can be mainly divided into the theoretical decomposition voltage of water, electrode reaction overpotential and ohmic voltage drop (contact resistance, diaphragm resistance and solution resistance, etc.). In addition to the influence of electrode and diaphragm materials, ohmic voltage drop is the main factor affecting the energy consumption of the electrolyzer, among which the electrolyzer structure mainly affects the ohmic voltage drop caused by the components in the cell.

[0005] The alkaline water hydrogen production electrolyzer usually adopts a structure in which the plate and the electrode are separated. The design of the plate will also affect the electrode resistance of the alkaline water hydrogen production electrolyzer and the contact resistance between the electrode and the diaphragm. In order to reduce the resistance, it is usually adopted to distribute the mastoid structure on the plate or to specially add a connecting component between the plate and the electrode to enhance the contact between the plate and the electrode.

[0006] For conventional circular high-pressure alkaline electrolyzers, the main plates on both sides of the diaphragm of the electrolytic unit are usually assembled using a nipple-shaped structure to press the anode and cathode electrodes on both sides of the diaphragm "top to top". This structure with both sides of the membrane being rigidly supported has the following disadvantages:

[0007] (1) Limitation of mastoid depth: The plates at both ends of the diaphragm are in rigid contact with the electrodes, and the distance between the plates and the diaphragm is fixed. If the mastoid depth is too small, on the one hand, it cannot effectively disturb the electrolyte flow, resulting in uneven concentration distribution of the electrolyte and increased solution resistance. On the other hand, it leads to insufficient contact between the diaphragm, electrode and plate, resulting in increased internal resistance. If the mastoid depth is too large, the distance between the cells will increase, the number of mastoids per unit area will decrease, resulting in fewer contact points between the plates and electrodes, and it is easy to squeeze and pierce the diaphragm.

[0008] (2) Limitation of the number of mastoids: Since the mastoid structure on one side of the main electrode forms a concave structure on the other side, the number of mastoids that can be formed on one side per unit area is limited.

[0009] The key to solving the above-mentioned design deficiencies of the conventional high-pressure alkaline water electrolyzer structure is to introduce a suitable flexible internal structure.

[0010] One of the prior arts involves two types of support structures on the main pole plate. One is to punch out a nipple on the main pole plate, which is a structure with rigid support on both sides of the diaphragm. The other is to set a flexible support net on the plane main pole plate, which is a structure with flexible support on both sides of the diaphragm.

[0011] If both sides adopt rigid structures, it is impossible to avoid the diaphragm being pressed through by excessive preload; if both sides adopt flexible supports, it is impossible to provide sufficient support force for the electrode and the diaphragm to be in close contact, and the electrode cannot be in close contact with the diaphragm when the preload force is insufficient, especially the flexible support structure in the prior art is a corrugated mesh punched from a flat woven metal mesh, and the thickness of the main electrode plate is relatively thin;

[0012] Moreover, the electrode assembly of the prior art uses foamed nickel as the active electrode. When the foamed nickel is used to be supported by the nipple on the main electrode plate to compensate for the preload force of the electrolytic cell assembly, it cannot rebound after being deformed by being pressed and flattened, which will lead to the loss of active area of ​​the electrode surface and thus cause the cell pressure to increase.

[0013] In the second prior art, an elastic retaining element having a spring or corrugated mesh structure is arranged between the tank body and the cathode and anode electrodes, and both sides of the diaphragm are supported flexibly, which cannot provide sufficient support force for the electrodes and the diaphragm to be closely attached.

[0014] In the prior art, a nickel felt with a thickness of 0.5 mm is arranged between the electrode and the diaphragm as a buffer structure. On the one hand, the nickel felt structure is relatively compact, and the preload force that can be supplemented by this thickness is limited. On the other hand, its thickness is close to the order of magnitude of the diaphragm. After being superimposed on both sides of the diaphragm, the negative impact on the slot pressure between the positive and negative electrodes is even greater. A new ohmic voltage drop will be formed between the electrode and the nickel felt, resulting in increased energy consumption. Utility Model Content

[0015] The purpose of the utility model is to overcome the defects of the above-mentioned prior art, namely, the higher ohmic voltage drop and lower electrolysis efficiency of the high-pressure alkaline water electrolyzer caused by the unreasonable design of the electrolyzer structure, and to provide a small chamber internal component structure for improving the efficiency of the high-pressure alkaline water electrolyzer. The utility model increases the contact between the plate and the electrode, and the electrode and the diaphragm, ensures the compact structure of the electrolyzer, reduces the cell pressure of the electrolysis chamber, enhances the elasticity of the overall structure, and prevents the diaphragm from being punctured and causing the anode and cathode gases to cross each other.

[0016] The purpose of the utility model can be achieved through the following technical solutions:

[0017] One of the technical solutions of the utility model is to provide a small indoor component structure for improving the efficiency of a high-pressure alkaline water electrolyzer, the internal component structure comprising a pole frame, a bipolar plate, an electrode, a diaphragm, a gasket and an elastic element;

[0018] The pole frame is provided with a pole plate, the electrode includes an anode and a cathode, and the pole plate, the anode, the diaphragm, the cathode, and the pole plate are stacked in sequence;

[0019] The electrode plate is provided with a unidirectional mastoid structure facing one electrode as a rigid support, and the unidirectional mastoid structure forms a recessed structure on the other side of the electrode plate. An elastic element is provided between the recessed structure of the electrode plate and the other electrode as a flexible support, and current conduction is achieved between the elastic element and the bipolar plate through mutual contact, and the elastic element and the mastoid structure press the electrodes against both sides of the diaphragm.

[0020] Furthermore, the convex curved surface of the mastoid structure on one side of the anode presses the anode against the diaphragm to form a reliable multi-point contact, making the current density distribution on the electrode more uniform;

[0021] An elastic element is provided on one side of the concave curved surface of the nipple structure on one side of the cathode, and the elastic element presses the cathode against the diaphragm, and current conduction is achieved between the elastic element and the cathode through multi-point contact;

[0022] The convex and concave surfaces of the papillary structure form a cavity and a circulation channel for the flow of electrolyte and generated hydrogen / oxygen. The elastic element increases the disturbance in the flow process while ensuring good fluidity of the electrolyte flow channel and the airway, reduces the concentration gradient of the electrolyte in the small chamber, and thus reduces the energy consumption of electrolysis.

[0023] Furthermore, the elastic element may be in the form of a spring foot, a hexagonal elastic support, an elastic wire mesh, a perforated plate corrugated sheet or a camel hump elastic support.

[0024] As a preferred technical solution, the elastic element is made of metal and non-metal materials with good conductivity and resilience, the metal material includes nickel, nickel alloy or stainless steel, and the non-metal material includes conductive rubber or carbon material.

[0025] Furthermore, a grid-like structure is provided on both sides of the spring foot;

[0026] The grille is bent outward one to three times, and adjacent spring legs are cross-connected into a whole through adjacent grilles;

[0027] The cross section of the spring foot is an inverted "J" shape, the bottom of the spring foot contacts the concave side of the electrode plate, and the top of the spring foot contacts the cathode, which plays a conductive role and provides support for the electrode, so that it is close to the diaphragm to achieve zero pole distance;

[0028] The hollow structure of the grid facilitates gas and liquid mass transfer.

[0029] As a preferred technical solution, the spring foot is made by cutting a thin plate into a corresponding shape by laser and then bending it into shape.

[0030] As a preferred technical solution, the plate thickness is 0.1-0.3 mm.

[0031] As a preferred technical solution, the length of the grid is 2-4 cm and the width is 0.3-0.8 cm.

[0032] Further, a hexagonal structure is provided on the hexagonal elastic support;

[0033] The hexagons are repeatedly arranged, and the six sides constituting the same hexagon are bent in two groups in opposite directions, so that a hollow structure is formed between adjacent hexagons;

[0034] The top and bottom of the hexagon are both provided with platforms, which are in close contact with the concave side of the plate and the cathode, respectively, and a sufficient platform area is obtained by repeatedly arranging the hexagonal structure;

[0035] The hexagonal hollow structure facilitates gas and liquid mass transfer.

[0036] As a preferred technical solution, the hexagonal elastic support is manufactured by cutting a thin plate into a corresponding shape by laser and then stamping it on both sides.

[0037] As a preferred technical solution, the plate thickness is 0.1-0.3 mm.

[0038] As a preferred technical solution, the height of the hexagon is 3-8 cm.

[0039] Furthermore, a corrugated structure is provided on the elastic wire mesh;

[0040] By changing the stamping die, the corrugation pattern includes a straight line type (==) or a wave type (≈≈);

[0041] The crests and troughs of the corrugations are in contact with the concave side of the electrode plate and the cathode respectively to achieve current conduction.

[0042] As a preferred technical solution, the elastic wire mesh is formed by stamping a flat woven metal wire mesh and has a corrugated structure, which does not affect the mass transfer of gas and liquid.

[0043] As a preferred technical solution, the wire diameter is 0.1-0.3 mm.

[0044] As a preferred technical solution, the depth of the corrugations is 4-8 cm.

[0045] Furthermore, a corrugated structure is provided on the orifice plate corrugated sheet;

[0046] By changing the stamping die, the corrugation pattern includes a straight line type (==) or a wave type (≈≈);

[0047] The crest and trough of the corrugation are in contact with the concave side of the plate and the cathode respectively to realize current conduction;

[0048] At the same time, holes are distributed on the orifice plate corrugated sheet to facilitate gas and liquid mass transfer.

[0049] As a preferred technical solution, the orifice plate corrugated sheet is formed by punching a thin plate.

[0050] As a preferred technical solution, the plate thickness is 0.1-0.3 mm.

[0051] As a preferred technical solution, the depth of the corrugations is 4-8 cm.

[0052] Furthermore, a hump structure is provided on the hump elastic support, the hump is a semi-elliptical structure, and a platform is left between adjacent humps for close contact with the electrode plate;

[0053] The top of the hump contacts the cathode, and the bottom platform contacts the concave side of the plate to achieve current conduction;

[0054] At the same time, holes are distributed on the hump to facilitate gas and liquid mass transfer.

[0055] As a preferred technical solution, the hump elastic support is formed by stamping a thin plate.

[0056] As a preferred technical solution, the plate thickness is 0.1-0.3 mm.

[0057] As a preferred technical solution, the height of the hump is 3-8 cm.

[0058] Furthermore, gas-liquid flow channels and alkali liquid flow channels are provided on both sides of the pole frame, and radial hole flow channels are provided on the inner sides of the gas-liquid flow channels and the alkali liquid flow channels, and the radial hole flow channels are distributed on both sides of the pole plate, and the gas-liquid flow channels and the alkali liquid flow channels are connected to the interior of the electrolysis unit through the radial hole flow channels respectively; the electrolyte enters the internal flow channel of the electrolysis unit from the alkali liquid flow channel through the radial hole flow channels, and an electrolysis reaction occurs on the surface of the electrode, and the generated hydrogen and oxygen mixed with alkali liquid are discharged from their respective radial hole flow channels to the gas-liquid flow channel, and are collected after gas-liquid separation, and the electrolyte is discharged from the radial hole flow channels and the alkali liquid flow channels, and is recycled after cooling.

[0059] As a preferred technical solution, a gas-liquid flow channel is opened at the upper part of the pole frame, and an alkali liquid flow channel is opened at the lower part.

[0060] Furthermore, adjacent pole frames are sealed by gaskets, a diaphragm is sandwiched between the gaskets, and gas-liquid flow channel holes and alkaline solution flow channel holes corresponding to the pole frames are opened on both sides of the gaskets.

[0061] As a preferred technical solution, a gas-liquid flow channel hole is opened on the upper part of the gasket, and an alkali liquid flow channel hole is opened on the lower part.

[0062] The utility model improves the internal structure of the filter-press type high-pressure alkaline water electrolyzer, cancels the bidirectional mastoid bipolar plate design in the traditional electrolyzer structure, replaces it with a unidirectional bipolar plate structure, and adopts an elastic structure with flexible support at the cathode. The traditional two-sided rigid support is easy to press through the diaphragm and cause gas mutual crosstalk, so the utility model introduces a flexible support structure to increase the elasticity of the internal structure of the electrolyzer. If flexible supports are used on both sides, there is a disadvantage of insufficient supporting force / pressing force. Therefore, the internal structure of the utility model combines a rigid support on one side with a flexible support on one side, and while providing sufficient supporting force to make the electrode close to the diaphragm, the elasticity of the unilateral flexible support is used to compensate for excessive preload force to prevent the diaphragm from being pressed through.

[0063] Compared with the prior art, the utility model has the following beneficial effects:

[0064] (1) The utility model mainly improves the electrolysis efficiency of the high-pressure alkaline water electrolyzer by improving the internal structure of the bipolar electrolyzer chamber, adopts a unidirectional mastoid plate as the electrode plate, adopts a rigid support structure between the anode electrode and the electrode plate, and adopts a flexible support structure between the cathode electrode and the electrode plate; the rigid support side uses the common mastoid structure, and the mastoid contacts the anode electrode at multiple points, and the flexible support side is provided with elastic elements such as spring feet, hexagonal elastic supports, elastic screens, orifice plate corrugated sheets and hump elastic supports between the concave side of the electrode plate and the cathode electrode;

[0065] (2) The present invention adopts a rigid support and a flexible support structure design between the anode and cathode electrodes and the electrode plates, respectively. On the one hand, it is used to increase the contact between the electrode plates and the electrodes, and between the electrodes and the diaphragm, which can effectively reduce the ohmic voltage drop and the cell voltage, thereby achieving the purpose of improving the electrolysis efficiency; on the other hand, the addition of the flexible support enhances the elasticity of the overall structure of the cell, which can prevent the diaphragm from being pierced by the electrode and causing the anode and cathode gases to cross each other, ultimately achieving the purpose of increasing the hydrogen production and improving the safety of the electrolyzer device;

[0066] (3) Since the cathode side of the utility model adopts a flexible support, the mastoid structure on the bipolar plate is changed to a unidirectional mastoid, and the mastoid faces the anode electrode. Therefore, while maintaining the same processing cost, the number of unidirectional mastoids distributed per unit area can be doubled, which increases the contact points between the bipolar plate and the electrode and reduces the contact resistance between the anode electrode and the plate;

[0067] (4) The elastic element and the nipple structure in the utility model press the electrodes more tightly against the two sides of the diaphragm, forming a more reliable multi-point electrical contact, so that the current density distribution on the cathode plate and the anode plate during the electrolysis process is more uniform, ultimately achieving the purpose of reducing the cell pressure in the small chamber and improving the efficiency of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a schematic diagram of the structure of the small chamber internal parts structure for improving the efficiency of the high-pressure alkaline water electrolyzer in Example 1 of the utility model;

[0069] Figure 2 This is a schematic diagram of the structure of the spring foot in Embodiment 1 of the present utility model;

[0070] Figure 3 This is a schematic diagram of the structure of the small chamber internal parts structure for improving the efficiency of the high-pressure alkaline water electrolyzer in Example 2 of the utility model;

[0071] Figure 4 This is a schematic diagram of the structure of the hexagonal elastic support in Example 2 of the utility model;

[0072] Figure 5 This is a schematic diagram of the structure of the small chamber internal parts for improving the efficiency of the high-pressure alkaline water electrolyzer in Example 3 of the utility model;

[0073] Figure 6 This is a schematic diagram of the structure of the elastic wire mesh in Example 3 of the utility model;

[0074] Figure 7 This is a schematic diagram of the structure of the small chamber internal parts structure for improving the efficiency of the high-pressure alkaline water electrolyzer in Example 4 of the utility model;

[0075] Figure 8 This is a schematic diagram of the structure of the corrugated sheet of the orifice plate in Example 4 of the utility model;

[0076] Fig. 9 This is a schematic diagram of the structure of the small chamber internal parts structure for improving the efficiency of the high-pressure alkaline water electrolyzer in Example 5 of the utility model;

[0077] Fig.10 This is a schematic diagram of the structure of the hump elastic support in Example 5 of the utility model.

[0078] Description of the markings in the figure:

[0079] 1—polar frame, 2—radial hole flow channel, 3—polar plate, 4—anode, 5—diaphragm, 6—gasket, 7—gas-liquid flow channel, 8—cathode, 9—elastic element, 10—alkali solution flow channel. DETAILED DESCRIPTION

[0080] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0081] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are used to describe common objects, and only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other manner.

[0082] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] Example:

[0084] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Figure 1 , Figure 3 , Figure 5 , Figure 7 and Fig. 9As shown, it includes a pole frame 1, a bipolar plate, an electrode, a diaphragm 5, a gasket 6 and an elastic element 9;

[0085] A gas-liquid flow channel 7 is provided at the upper part of the pole frame 1, and an alkali liquid flow channel 10 is provided at the lower part. A radial hole flow channel 2 is provided on the inner side of the gas-liquid flow channel 7 and the alkali liquid flow channel 10 of the pole frame 1. The radial hole flow channels 2 are distributed on both sides of the pole plate. The gas-liquid flow channel 7 and the alkali liquid flow channel 10 are respectively connected to the inside of the electrolysis unit through the radial hole flow channels 2; the electrolyte enters the internal flow channel of the electrolysis unit from the alkali liquid flow channel 10 below through the radial hole flow channels 2, and an electrolysis reaction occurs on the surface of the electrode. The generated hydrogen and oxygen mixed with the alkali liquid are discharged from their respective radial hole flow channels 2 above to the gas-liquid flow channel 7, and are collected after gas-liquid separation. The electrolyte is discharged from the radial hole flow channels 2 and the alkali liquid flow channels 10 below, and is recycled after cooling;

[0086] The pole frame 1 is provided with a pole plate, the electrode includes an anode 4 and a cathode 8, and the pole plate, the anode 4, the diaphragm 5, the cathode 8, and the pole plate are stacked in sequence;

[0087] The electrode plate 3 is provided with a unidirectional mastoid structure facing the anode 4 as a rigid support, and the unidirectional mastoid structure forms a concave structure on the other side of the electrode plate 3. An elastic element 9 is provided between the concave structure of the electrode plate 3 and the cathode 8 as a flexible support. The elastic element 9 and the bipolar plate are in contact with each other to achieve current conduction. The elastic element 9 and the mastoid structure press the electrode against both sides of the diaphragm 5.

[0088] The convex surface of the mastoid structure on one side of the anode 4 presses the anode 4 against the diaphragm 5, forming a reliable multi-point contact, making the current density distribution on the electrode more uniform;

[0089] An elastic element 9 is provided on one side of the concave curved surface of the mastoid structure on one side of the cathode 8. The elastic element 9 presses the cathode 8 against the diaphragm 5. The elastic element 9 and the cathode 8 achieve current conduction through multi-point contact.

[0090] The convex and concave surfaces of the mastoid structure can form a cavity and a circulation channel for the flow of electrolyte and generated hydrogen / oxygen. The elastic element 9 increases the disturbance in the flow process while ensuring good fluidity of the electrolyte flow channel and the airway, reduces the concentration gradient of the electrolyte in the small chamber, and thus reduces the energy consumption of electrolysis.

[0091] The elastic element 9 includes a spring foot, a hexagonal elastic support, an elastic wire mesh, a perforated plate corrugated sheet, a hump elastic support and other structures having similar functions;

[0092] The elastic element 9 is made of metal (such as nickel, nickel alloy, stainless steel, etc.) and non-metal (such as conductive rubber, carbon material, etc.) materials with good electrical conductivity and resilience;

[0093] Adjacent pole frames 1 are sealed by gaskets 6, diaphragms 5 are sandwiched between the gaskets 6, gas-liquid flow holes are opened on the upper part of the gasket 6, and alkali liquid flow holes are opened on the lower part. The gas-liquid flow holes and alkali liquid flow holes of the gasket 6 are correspondingly connected with the gas-liquid flow channels 7 and alkali liquid flow channels 10 of the pole frame 1.

[0094] Embodiment 1:

[0095] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Figure 1 and Figure 2 As shown, the elastic element 9 is in the form of a spring foot, which is made by cutting a 0.1-0.3 mm thin metal plate into a corresponding shape by laser and then bending it. In this embodiment, a 0.15 mm thin nickel plate is preferably used. A row of grid-like structures is provided on both sides of the spring foot. The length of the grid is 2-4 cm, preferably 3 cm in this embodiment, and the width is 0.3-0.8 cm, preferably 0.5 cm in this embodiment;

[0096] The grille is bent outward one to three times, preferably once in this embodiment, and adjacent spring legs are cross-connected as a whole through adjacent grilles;

[0097] The cross section of the spring foot after bending is an inverted "J" shape, the bottom of the spring foot contacts the concave side of the electrode plate 3, and the top of the spring foot contacts the cathode 8, which plays a conductive role and provides support to the electrode, so that it is close to the diaphragm 5 to achieve zero polar distance;

[0098] The hollow structure of the grid facilitates gas and liquid mass transfer.

[0099] Embodiment 2:

[0100] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Figure 3 and Figure 4 As shown, the elastic element 9 is in the form of a hexagonal elastic support, which is made by laser cutting a 0.1-0.3 mm thin metal plate into a corresponding shape and then stamping it on both sides. In this embodiment, a 0.15 mm thin nickel plate is preferred. The height of the hexagon can cover 3-8 cm, and in this embodiment, it is preferably 5 cm;

[0101] The hexagons are arranged repeatedly, and the six sides of the same hexagon are bent in two groups in opposite directions, so that a hollow structure is formed between adjacent hexagons;

[0102] The top and bottom of the hexagon are provided with platforms, which can be in close contact with the concave side of the electrode plate 3 and the cathode 8 respectively. By repeatedly arranging the hexagonal structure, a sufficient platform area is obtained;

[0103] The hexagonal hollow structure facilitates gas and liquid mass transfer.

[0104] Embodiment 3:

[0105] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Figure 5 and Figure 6 As shown, the elastic element 9 is in the form of an elastic wire mesh, which is formed by weaving metal wires into a flat mesh and then punching to form a corrugated structure, with a wire diameter of 0.1-0.3 mm, preferably 0.2 mm nickel wire in this embodiment, and a depth of the corrugation after punching of 4-8 cm, preferably 6 cm in this embodiment;

[0106] By changing the stamping die, the corrugation pattern can be linear (==) or wavy (≈≈), etc. In this embodiment, the linear pattern is preferred;

[0107] The crest and trough of the corrugation are in contact with the concave side of the plate 3 and the cathode 8 respectively to achieve current conduction;

[0108] The elastic wire mesh is formed by stamping a flat woven wire mesh and does not affect the mass transfer of gas and liquid.

[0109] Embodiment 4:

[0110] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Figure 7 and Figure 8 As shown, the elastic element 9 is in the form of a perforated plate corrugated sheet having a corrugated structure. The perforated plate corrugated sheet is stamped from a 0.1-0.3 mm thin metal plate, preferably a 0.2 mm thin nickel plate in this embodiment. The depth of the corrugation after stamping is 4-8 cm, preferably 6 cm in this embodiment;

[0111] By changing the stamping die, the corrugation pattern can be linear (==) or wavy (≈≈), etc. In this embodiment, the linear pattern is preferred;

[0112] The crest and trough of the corrugation are in contact with the concave side of the plate 3 and the cathode 8 respectively to achieve current conduction;

[0113] There are holes distributed on the orifice plate corrugated sheet to facilitate gas and liquid mass transfer.

[0114] Embodiment 5:

[0115] A small room interior structure for improving the efficiency of a high-pressure alkaline water electrolyzer, such as Fig. 9 and Fig.10As shown, the elastic element 9 is in the form of a hump elastic support, which is stamped from a 0.1-0.3 mm thin metal plate, preferably a 0.15 mm thin nickel plate in this embodiment, having a hump structure, a semi-elliptical structure, and a platform between adjacent humps for close contact with the electrode plate 3. The height of the hump is 3-8 cm, preferably 5 cm in this embodiment;

[0116] The top of the hump contacts the cathode 8, and the bottom platform contacts the concave side of the plate 3 to achieve current conduction;

[0117] There are holes distributed on the hump to facilitate gas and liquid mass transfer.

[0118] Comparative Example 1:

[0119] A small chamber inner structure is basically the same as the embodiment, except that the pole plate 3 is a flat plate, and elastic elements 9 are provided between the pole plate 3 and the anode 4 and the cathode 8 as flexible supports.

[0120] Comparative Example 2:

[0121] A small chamber inner component structure is basically the same as the embodiment, except that the pole plate 3 is a bidirectional mastoid plate, and the bidirectional mastoid structure of the pole plate 3 toward the anode 4 and the cathode 8 serves as a rigid support.

[0122] The above-mentioned chamber internal component structure was subjected to a chamber cell pressure test on a small test device with an electrode size of 10cm×10cm. The electrolyte was a 30wt% potassium hydroxide (KOH) aqueous solution and the electrolysis temperature was 60-80°C, preferably 70°C in this embodiment.

[0123] Current density is 4000A / m 2 When the internal structure with one side rigid and the other side flexible support in Examples 1 to 5 is adopted, the chamber groove pressure is 20mV lower on average than the structure with both sides flexible support in Comparative Example 1, and is also 20mV lower on average than the structure with both sides rigid support in Comparative Example 2.

[0124] Current density is 6000A / m 2 When the internal structure with one side rigid and the other side flexible support in Examples 1 to 5 is adopted, the chamber groove pressure is 25mV lower on average than the structure with both sides flexible support in Comparative Example 1, and 35mV lower on average than the structure with both sides rigid support in Comparative Example 2.

[0125] Current density is 8000A / m 2 When the internal structure with one side rigid and the other side flexible support in Examples 1 to 5 is adopted, the chamber groove pressure is 45mV lower on average than the structure with both sides flexible support in Comparative Example 1, and 35mV lower on average than the structure with both sides rigid support in Comparative Example 2.

[0126] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer, characterized in that: The internal structure comprises a pole frame (1), a bipolar plate, an electrode, a diaphragm (5), a gasket (6) and an elastic element (9); The pole frame (1) is provided with a pole plate, the electrode comprises an anode (4) and a cathode (8), and the pole plate, the anode (4), the diaphragm (5), the cathode (8), and the pole plate are stacked in sequence; The electrode plate (3) is provided with a unidirectional mastoid structure facing one electrode as a rigid support, the unidirectional mastoid structure forms a recessed structure on the other side of the electrode plate (3), an elastic element (9) is provided between the recessed structure of the electrode plate (3) and the other electrode as a flexible support, and the elastic element (9) and the mastoid structure press the electrodes against the two sides of the diaphragm (5).

2. A small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 1, characterized in that: The convex curved surface of the mastoid structure on one side of the anode (4) presses the anode (4) against the diaphragm (5) to form multi-point contact; An elastic element (9) is provided on one side of the concave curved surface of the mastoid structure on one side of the cathode (8), and the elastic element (9) presses the cathode (8) against the diaphragm (5).

3. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 1, characterized in that: The elastic element (9) includes a spring foot, a hexagonal elastic support, an elastic wire mesh, a perforated plate corrugated sheet or a camel hump elastic support.

4. A small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 3, characterized in that: A grid-like structure is provided on both sides of the spring foot; The grille is bent outward one to three times, and adjacent spring legs are cross-connected into a whole through adjacent grilles; The cross section of the spring foot is an inverted "J" shape, the bottom of the spring foot contacts the recessed side of the electrode plate (3), and the plurality of contacts on the top contact the cathode (8).

5. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 3, characterized in that: A hexagonal structure is provided on the hexagonal elastic support; The hexagons are repeatedly arranged, and a hollow structure is formed between adjacent hexagons; The top and bottom of the hexagon are both provided with platforms, which are in contact with the concave side of the electrode plate (3) and the cathode (8) respectively.

6. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 3, characterized in that: The elastic wire mesh is provided with a corrugated structure; The corrugation pattern includes a straight line or a wave pattern; The crests and troughs of the corrugations are in contact with the concave side of the electrode plate (3) and the cathode (8) respectively.

7. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 3, characterized in that: The orifice plate corrugated sheet is provided with a corrugated structure; The corrugation pattern includes a straight line or a wave pattern; The crests and troughs of the corrugations are in contact with the concave side of the electrode plate (3) and the cathode (8) respectively; The orifice plate corrugated sheet is provided with holes.

8. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 3, characterized in that: A hump structure is arranged on the hump elastic support, the hump is a semi-elliptical structure, and a platform is left between adjacent humps; The top of the hump is in contact with the cathode (8), and the bottom platform is in contact with the concave side of the electrode plate (3); The hump is provided with holes.

9. The small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 1, characterized in that: Gas-liquid flow channels (7) and alkaline solution flow channels (10) are provided on both sides of the pole frame (1); radial hole flow channels (2) are provided on the inner sides of the gas-liquid flow channels (7) and the alkaline solution flow channels (10); the radial hole flow channels (2) are distributed on both sides of the pole plate; the gas-liquid flow channels (7) and the alkaline solution flow channels (10) are respectively connected to the interior of the electrolytic unit through the radial hole flow channels (2).

10. A small chamber structure for improving the efficiency of a high-pressure alkaline water electrolyzer according to claim 9, characterized in that: Adjacent pole frames (1) are sealed by gaskets (6), a diaphragm (5) is sandwiched between the gaskets (6), and gas-liquid flow channel holes and alkaline liquid flow channel holes corresponding to and connected to the pole frames (1) are opened on both sides of the gaskets (6).

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