Adhesive-fixed water electrolysis module

Abstract

To provide an adhesive-fixed water electrolysis module that enables simplifying product assembly and reducing assembly costs compared to a single stack fixing method using welding, riveting, bolting, etc., between conventional parts.SOLUTION: The present invention is an adhesive-fixed water electrolysis module comprising a single stack 100 having a separator, and a pair of bipolar plates 120a, 120b, a pair of gaskets 130a, 130b, a pair of diffusers 140a, 140b, and a pair of electrodes 150a, 150b, which are sequentially arranged on the cathode and anode sides, respectively, with respect to the separator, forming a symmetrical structure, wherein the separator, the pair of bipolar plates, the pair of gaskets, the pair of diffusers, and the pair of electrodes are stacked in a zero-gap manner in a cell frame 160, and the pair of bipolar plates are adhered and fixed to the cell frame using an adhesive.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an adhesively fixed alkaline water electrolysis module capable of assembling a single stack by fixing a bipolar plate and a cell frame with an adhesive.

Background Art

[0002] Water electrolysis is a technology that electrolyzes water to produce high-purity (99.999%) green hydrogen, and includes alkaline water electrolysis (AWE), polymer electrolyte membrane water electrolysis (PEMWE), solid oxide electrolyser cell (SOEC) technology, and the like.

[0003] Among these, alkaline water electrolysis is a technology that uses an alkaline aqueous solution such as KOH or NaOH as an electrolyte to generate hydrogen and oxygen. This alkaline water electrolysis has been studied for the longest period of time, its stability and price competitiveness have been proven, and it has high technical maturity. Specifically, alkaline water electrolysis uses nickel or stainless steel as a catalyst material instead of expensive noble metal catalysts, so it is a technology with relatively low initial installation cost, long system service life, and suitable for large-capacity hydrogen production.

[0004] The water electrolysis module used in such alkaline water electrolysis is a core component of water electrolysis equipment that decomposes supplied water to actually produce hydrogen, and is manufactured by stacking several to hundreds of unit components such as an anode, a cathode, and a separation membrane. This water electrolysis module is configured by stacking a plurality of single stacks, and each single stack is formed with a hydrogen generating electrode, a diffuser, and a bipolar plate arranged on one side, and an oxygen generating electrode, a diffuser, and a bipolar plate arranged on the other side with the separation membrane as a reference.

[0005] Conventional alkaline water electrolysis modules can be divided into single-cell stacking type and bolt-fastened stacking type water electrolysis modules. The single-cell stacking type water electrolysis module is a modified version of the electrolysis apparatus used in the conventional chloro-alkali process, and consists of a desired number of single cells, each having an independent input / output structure for gas, liquid, and current, connected together. The bolt-fastened stacking type water electrolysis module consists of a desired number of single cells, each constructed by sequentially connecting cell frames equipped with end plates, current collector plates, gaskets, mesh-type diffusion layers, electrodes, and separation membranes, and then fastened with bolts, after which the input / output of gas, liquid, and current are connected together.

[0006] The single-cell stacking water electrolysis module described above ensures product stability and technical capabilities by converting existing caustic soda production equipment for water electrolysis. However, this single-cell stacking water electrolysis module has the disadvantage of increasing the size and volume of each cell and the number of parts, as each cell has its own individual flow path. In particular, when stacking tens to hundreds of single cells, the single-cell stacking water electrolysis module suffers from inferior compatibility between stack components compared to the bolt-crimped stacking water electrolysis module, resulting in reduced water electrolysis efficiency. Furthermore, although the single-cell stacking water electrolysis module ensures product stability and technical capabilities, its large volume, the complex product configuration with each cell having an independent gas / liquid flow path structure, and the difficulty of repair and replacement are drawbacks.

[0007] On the other hand, bolt-crimp stack type water electrolysis modules simplify the gas and liquid flow paths through the continuous connection of single cells, reducing internal resistance and ensuring superior performance. However, bolt-crimp stack type water electrolysis modules have the disadvantage of increasing the number of parts due to the continuous fastening of each component, which can negatively affect the overall performance of the product if misassembled, and makes replacement and repair difficult. In particular, bolt-crimp stack type water electrolysis modules have the disadvantage of requiring the entire stack to be separated and the affected part replaced when a component is damaged or its performance deteriorates, thus requiring a long shutdown of the water electrolysis system and making on-site repairs difficult. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Republic of Korea Published Patent No. 10-2021-0010231 (January 27, 2021) [Patent Document 2] Republic of Korea Published Patent No. 10-2003-0090653 (November 28, 2003) [Patent Document 3] Republic of Korea Patent No. 10-1016445 (2011.02.14.) [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention was made to solve the above-mentioned problems, and aims to provide an adhesive-fixed water electrolysis module in which a stack can be easily assembled by bonding and fixing the bipolar plate and cell frame using an adhesive.

[0010] Furthermore, the present invention aims to provide an adhesive-fixed water electrolysis module that can flexibly accommodate a variety of capacities by stacking stacks assembled using adhesive fixing in a zero-gap manner, thereby reducing internal resistance and simplifying internal components. [Means for solving the problem]

[0011] To achieve the above objectives, the adhesive-fixed water electrolysis module according to the present invention includes a single stack comprising a separation membrane, bipolar plates arranged sequentially on the cathode side and anode side, respectively, with respect to the separation membrane and arranged symmetrically with respect to each other, a gasket, a diffuser, and an electrode, wherein the separation membrane, a pair of the bipolar plates, a pair of the gaskets, a pair of the diffusers, and a pair of the electrodes are stacked in a zero-gap manner within a cell frame, and the pair of bipolar plates are bonded and fixed to the cell frame using an adhesive.

[0012] Preferably, adhesive application lines are formed on the edges of both sides of the cell frame, and the pair of bipolar plates are bonded and fixed to the cell frame by the adhesive applied to the adhesive application lines.

[0013] More preferably, the adhesive is characterized by having heat resistance and alkali resistance, and being a thermoplastic, room-temperature curing, two-component, or one-component adhesive.

[0014] More preferably, the depth of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the gasket thickness, and the width of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the depth of the adhesive application line.

[0015] In addition, the present invention further includes physical fastening means for fastening the cell frame and the bipolar plate, wherein the physical fastening means includes a first fastening portion protruding from the outer edge of the cell frame and a second fastening portion formed on the outer edge of the bipolar plate and fastened to the first fastening portion, and the first fastening portion and the second fastening portion are fitted together in a snap-fit ​​manner.

[0016] Preferably, the second fastening portion includes a bent portion that is bent from the outer edge of the bipolar plate toward the cell frame and encloses the outer edge of the cell frame, and a groove portion into which the first fastening portion is fitted, with the central part of the bent portion being cut open. The first fastening portion has a hook shape with its end protruding outward and is fitted into the groove portion of the second fastening portion in a snap-fit ​​manner.

[0017] Preferably, the cell frame has a central portion which houses the separation membrane, a pair of gaskets, a pair of diffusers, and a pair of electrodes, and an outer portion which has a gas channel for hydrogen and oxygen discharge and an electrolyte channel for electrolyte inflow and outflow, and the bipolar plate has a gas channel and an electrolyte channel corresponding to the gas channel and electrolyte channel of the cell frame, and a plurality of the single stacks are connected by a bolt crimping method or by a hydraulic press method to constitute a water electrolysis module.

[0018] More preferably, the cell frame includes gasket leak prevention projections having projections arranged in double or triple rows to surround the gas flow path and electrolyte flow path, the gasket has double or triple projections that fit between the projections of the gasket leak prevention projections, and when the single stack is crimped, the gasket is crimped to the cell frame in a snap-fit ​​manner. [Effects of the Invention]

[0019] According to the present invention, by fixing the cell frame and a pair of bipolars with adhesive to form a stack, product assembly is simpler and assembly costs can be reduced compared to conventional stack fixing methods using inter-part welding, riveting, bolting, etc.

[0020] Further, according to the present invention, after the cell frame and the bipolar plate are primarily fixed by an adhesive, they are additionally coupled by a physical fastening means, whereby the stack can be assembled more firmly. In addition, the physical fastening means fixes the stack components at accurate positions without steps, thereby preventing a decrease in the efficiency of the water electrolysis module. [BRIEF DESCRIPTION OF THE DRAWINGS]

[0021] [Figure 1] Fig. 1 is an exploded perspective view showing a single stack of the adhesion-fixed water electrolysis module according to the present invention. [Figure 2] Fig. 2 is a front view showing a cell frame of a single stack of the adhesion-fixed water electrolysis module according to the present invention. [Figure 3] Fig. 3 is a perspective view showing the physical fastening means of the adhesion-fixed water electrolysis module according to the present invention, which shows a state where the cell frame and the bipolar plate are fastened. [MODE FOR CARRYING OUT THE INVENTION]

[0022] Hereinafter, preferred embodiments of the adhesion-fixed water electrolysis module according to the present invention will be described with reference to the accompanying drawings. For reference, in the following description of the present invention, terms referring to the constituent elements of the present invention are named in consideration of the function of each constituent element, and therefore should not be understood as limiting the technical constituent elements of the present invention.

[0023] Referring to Figures 1 and 2, the adhesive-fixed water electrolysis module according to the present invention includes at least one single stack 100, each single stack 100 including a separation membrane 110, bipolar plates 120a and 120b arranged sequentially on the cathode side and anode side, respectively, with respect to the separation membrane 110, gaskets 130a and 130b, diffusers 140a and 140b, and electrodes 150a and 150b, the bipolar plates 120a and 120b, gaskets 130a and 130b, diffusers 140a and 140b, and electrodes 150a and 150b are arranged symmetrically with respect to the separation membrane 110.

[0024] Specifically, a single stack 100 is constructed by fastening a pair of bipolar plates 120a, 120b to a cell frame 160 so that the stack components, namely the separation membrane 110, a pair of electrodes 150a, 150b, a pair of diffusers 140a, 140b, and a pair of gaskets 130a, 130b, are housed inside the cell frame 160. In other words, within the cell frame 160, the cathodic bipolar plate 120a, gasket 130a, diffuser 140a, and electrode 150a are stacked symmetrically around the separation membrane 110, and the anode bipolar plate 120b, gasket 130b, diffuser 140b, and electrode 150b are stacked on the anode side.

[0025] The cell frame 160 is made of a material resistant to strong alkalis, such as PS (Polystyrene), PESU (Polyethersulfone), PP (Polypropylene), PPSU (Polyphenylsulfone), PTFE (Polytetrafluoroethylene), or stainless steel. The cell frame 160 has a separate anode chamber and a cathode chamber, and includes gas channels 161 and 162 for hydrogen and oxygen discharge, and electrolyte channels 163 and 164 for electrolyte inflow and discharge. The cell frame 160 may be laminated between a pair of cell frame supports (not shown).

[0026] The bipolar plates 120a and 120b are metal plates positioned on the outermost edges of the single stack 100, respectively, and function as boost bars that apply an external current to the internal electrodes 150a and 150b, thereby enabling electrical connections between the stacked single stacks 100. The bipolar plates 120a and 120b are equipped with gas channels for hydrogen and oxygen exhaust and electrolyte channels for electrolyte inflow and outflow.

[0027] Gaskets 130a and 130b are designed to prevent leakage between the individual components that make up the single stack 100 and are inserted between the bipolar plates 120a and 120b and the cell frame 160. These gaskets 130a and 130b are made of a material resistant to strong alkalis, such as EPDM (Ethylene Propylene Diene M-Cl Ass Rubber), fluororubber, or PTFE (Polytetrafluoroethylene). Furthermore, gaskets 130a and 130b are formed in a double-protrusion shape, providing airtightness between the stacked components and preventing liquid or gas leakage from between the components.

[0028] The diffusers 140a and 140b are positioned on one surface of the electrodes 150a and 150b facing the bipolar plates 120a and 120b, and play a role in uniformly diffusing the fluid supplied from the separation membrane 110 to the cathode electrode 150a and the anode electrode 150b. These diffusers 140a and 140b are porous bodies manufactured in the form of a mesh, knit, or foam, and have, for example, pore sizes of 10 μm to 10 mm and thicknesses of 0.1 mm to 20 mm.

[0029] Electrodes 150a and 150b are placed between the separation membrane 110 and the diffusers 140a and 150b. These electrodes 150a and 150b are mainly made of transition metals such as Ni, Fe, Co, and Mo, and can be manufactured by coating, plasma coating, or plating a mixed oxide of these transition metals onto a porous metal body.

[0030] The separation membrane 110 is laminated between a pair of electrodes 150a and 150b. This separation membrane 110 is a porous composite in which ceramic particles are dispersed to ensure durability in a strongly basic environment. For example, the separation membrane 110 can be manufactured by spraying a zirconium mixture onto a PPS (Polyphenylene sulfide) or PPSU (Polyphenylsulfone) polymer matrix support.

[0031] Additionally, the separation membrane 110 is fixed inside the separation membrane fixing frame 111, and a separation membrane gasket 112 is placed between the separation membrane fixing frame 111 and the separation membrane 110 to prevent leakage around the separation membrane 110.

[0032] Here, a housing section 165 is formed in the center of the cell frame 160 for stacking and arranging a separation membrane 110, a pair of gaskets 130a and 130b, a pair of diffusers 140a and 140b, and a pair of electrodes 150a and 150b. In addition, channels 161 and 162 for hydrogen and oxygen discharge, and channels 163 and 164 for electrolyte inflow and outflow are formed in the outer part of the cell frame 165. Adhesive is applied to these adhesive application lines 170, and bipolar plates 120a and 120b are fixed to both sides of the cell frame 160 by adhesive.

[0033] Specifically, a separation membrane 110, a pair of gaskets 130a and 130b, a pair of diffusers 140a and 140b, and a pair of electrodes 150a and 150b are housed and stacked inside a cell frame 160, and bipolar plates 120a and 120b are bonded and fixed to both sides of the cell frame 160 with adhesive, thereby forming a single stack 100. In particular, the pair of bipolar plates 120a and 120b, the separation membrane 110 stacked inside the cell frame 160, the gaskets 130a and 130b, the diffusers 140a and 140b, and the electrodes 150a and 150b are stacked in a zero-gap manner, resulting in smooth current connection and reduced current loss due to low resistance.

[0034] Thus, the adhesive-fixed water electrolysis module according to the present invention does not require bonding or fastening other stack components (separation membrane, gasket, diffuser, electrodes), and a single stack 100 can be assembled by bonding and fixing only the cell frame 160 and a pair of bipolars 120a and 120b. Compared to conventional water electrolysis stacks that use fixing methods such as welding, riveting, and bolting between components, product assembly is simpler and assembly costs can be reduced.

[0035] Preferably, the adhesive has heat resistance and alkali resistance, and can be a thermoplastic, room-temperature curing, two-component, or one-component adhesive. For example, the adhesive used can withstand the high temperatures of up to 100°C or more and the strong alkalinity generated during water electrolysis operation.

[0036] Furthermore, the depth of the adhesive application line 170 formed on the cell frame 160 is determined by the viscosity of the adhesive and is designed to be 0.5 to 2 times the thickness of the gaskets 130a and 130b. Also, the width of the adhesive application line 170 is determined by the viscosity of the adhesive and is designed to be 0.5 to 2 times the depth of the adhesive application line.

[0037] Preferably, the adhesive-fixed water electrolysis module according to the present invention can be configured to accommodate a variety of capacities by stacking a desired number of single stacks 100 using a bolt-crimping method or a hydraulic press method, according to the water electrolysis operating capacity.

[0038] Although not shown in the drawings, when connecting single stacks 100 using a bolt crimping method, a water electrolysis module can be constructed by stacking the desired number of single stacks on a stacking frame according to the water electrolysis operating capacity, and connecting the single stacks using bolts and insert nuts in a bolt crimping method.

[0039] Furthermore, when connecting single stacks 100 using a hydraulic press system, a desired number of single stacks can be stacked on a stacking frame according to the water electrolysis operating capacity, and the stacked single stacks can be pressurized and fixed using a hydraulic press.

[0040] On the other hand, the cell frame 160 includes a gasket leak prevention projection portion 180 having double or triple-arranged projections that surround the gas flow paths 161, 162 and electrolyte flow paths 163, 164. Furthermore, the gaskets 130a and 130b described above have double or triple projections that fit between the projections of the gasket leak prevention projection portion 180.

[0041] With these gaskets 130a, 130b and gasket leak prevention projections 180, when assembling a single stack 100, the stack components are pressed together, and the gaskets 130a, 130b and the cell frame 160 are pressed together in a snap-fit ​​manner.

[0042] Preferably, the gaskets 130a, 130b or the projections of the gasket leak prevention projections 180 may be triangular in shape, symmetrical to each other in the vertical direction, and when a single stack 100 is compressed, they spread out in directions that separate them from each other, thereby preventing leakage of flowing gas and fluid.

[0043] Referring to Figure 3, the adhesive-fixed water electrolysis module according to the present invention includes physical fastening means for physically fastening a pair of bipolar plates 120a and 120b. This physical fastening means is for physically fixing the pair of bipolar plates 120a and 120b to the cell frame 60.

[0044] Specifically, the physical fastening means includes a first fastening portion 210 provided on the outer edge of the cell frame 160, and a second fastening portion 220 provided on the outer edges of the bipolar plates 120a and 120b, which are fastened to the first fastening portion 210. The first fastening portion 210 has a protruding shape that extends from the outer edge of the cell frame 160. The second fastening portion 220 includes a bent portion 221 that is bent from the outer edges of the bipolar plates 120a and 120b toward the cell frame 160 and encloses the outer edge of the cell frame 160, and a groove portion 222 that is cut open in the center of the bent portion 221 so that the first fastening portion 210 can be fitted into it. Here, the first fastening portion 210 and the second fastening portion 220 are fitted together in a snap-fit ​​manner.

[0045] Preferably, the cell frame 160 includes a pair of first fastening portions 210 arranged adjacently in the vertical direction on one side of its outer edge. One of the pair of first fastening portions 210 is fitted into a groove 222 of a second fastening portion 220 of one of the pair of bipolar plates 120a, 120b, and the other of the pair of first fastening portions 210 is fitted into a groove 222 of a second fastening portion 220 of the other bipolar plate 120b of the pair of bipolar plates 120a, 120b. Furthermore, the first fastening portions 210 of the cell frame 160 are hook-shaped with their ends protruding outward so as to fit firmly into the grooves 222 of the second fastening portions 220. With this configuration, when the first fastening portion 210 of the cell frame 160 engages with the groove portion 222 of the second fastening portion 220 of the bipolar plates 120a and 120b and connects them, the first fastening portion 210 slides on the bent portion 221 of the second fastening portion 210 and engages with the groove portion 222 of the second fastening portion 220 in a snap-fit ​​manner.

[0046] Furthermore, the pair of adjacent first fastening portions 210 are positioned on each of the four sides of the outer edge of the cell frame 160. Corresponding to these first fastening portions 210, the second fastening portions 220 are similarly positioned on each of the four sides of the outer edge of the bipolar plates 120a and 120b.

[0047] Thus, in the adhesive-fixed water electrolysis module according to the present invention, the cell frame 160 and bipolar plates 120a and 120b are initially fixed with an adhesive, and then further joined by physical fastening means, thereby assembling the single stack 100 of cell frame 160 and bipolar plates 120a and 120 in a more robust and stable manner.

[0048] The embodiments of the present invention described above are merely illustrative examples of the technical idea of ​​the present invention, and the scope of protection of the present invention should be interpreted in accordance with the following claims. Furthermore, any person with ordinary skill in the art to which the present invention belongs can make various modifications and variations without departing from the essential characteristics of the present invention, and all technical ideas that fall within the same scope as the present invention should be interpreted as being included in the scope of the rights of the present invention. [Explanation of Symbols]

[0049] 100 Single stack 110 Separation membrane 111 Separation membrane fixing frame 112 Separation membrane gasket 120a,120b Bipolar plate 130a,130b Gasket 140a,140b Diffuser 150a,150b Electrode 160 Cell frame 161,162 Gas flow path 163,164 Electrolyte flow path 165 Housing section 170 Adhesive application line 180 Gasket leak prevention projection 210 First fastening section 220 Second fastening section 221 Bending section 222 Groove section The claims as originally filed are included below. [1] A single stack comprising a separation membrane, bipolar plates arranged sequentially on the cathode side and anode side with respect to the separation membrane and arranged symmetrically with respect to each other, a gasket, a diffuser, and an electrode, The separation membrane, the pair of bipolar plates, the pair of gaskets, the pair of diffusers, and the pair of electrodes are stacked in a zero-gap manner within the cell frame. The adhesive-fixed water electrolysis module is characterized in that the pair of bipolar plates are bonded and fixed to the cell frame using an adhesive. [2] The adhesive-fixed water electrolysis module according to [1], characterized in that adhesive application lines are formed on the edges of both sides of the cell frame, and the pair of bipolar plates are bonded and fixed to the cell frame by adhesive applied to the adhesive application lines. [3] The adhesive-fixed water electrolysis module according to [2], characterized in that the adhesive is heat-resistant and alkali-resistant, thermoplastic, room-temperature curing, two-component, or one-component adhesive. [4] The depth of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the gasket thickness. The adhesive-fixed water electrolysis module according to [3], characterized in that the width of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the depth of the adhesive application line. [5] Further includes physical fastening means for fastening the cell frame and the bipolar plate, The physical fastening means includes a first fastening portion protruding from the outer edge of the cell frame and a second fastening portion formed on the outer edge of the bipolar plate and fastened with the first fastening portion. The adhesive-fixed water electrolysis module according to [2], characterized in that the first fastening portion and the second fastening portion are fitted together in a snap-fit ​​manner. [6] The second fastening portion includes a bent portion that is bent from the outer edge of the bipolar plate toward the cell frame and encloses the outer edge of the cell frame, and a groove portion that is cut open in the central part of the bent portion and into which the first fastening portion is fitted. The adhesive-fixed water electrolysis module according to [5], characterized in that the first fastening portion has a hook shape with its end protruding outward and is fitted into the groove of the second fastening portion in a snap-fit ​​manner. [7] The cell frame comprises a central portion comprising a housing portion that houses the separation membrane, a pair of gaskets, a pair of diffusers, and a pair of electrodes, and an outer portion comprising a gas channel for hydrogen and oxygen discharge and an electrolyte channel for electrolyte inflow and discharge, The bipolar plate is provided with gas channels and electrolyte channels corresponding to the gas channels and electrolyte channels of the cell frame, The adhesive-fixed water electrolysis module according to [1], characterized in that a plurality of the single stacks are connected by a bolt crimping method or by a hydraulic press method to constitute a water electrolysis module. [8] The cell frame includes gasket leak prevention protrusions having double or triple arrangement of protrusions surrounding the gas flow path and electrolyte flow path, The adhesive-fixed water electrolysis module according to [7], characterized in that the gasket has double or triple protrusions that fit between the protrusions of the gasket leak prevention protrusions, and when the single stack is crimped, the gasket is crimped to the cell frame in a snap-fit ​​manner.

Claims

1. The single stack includes a separation membrane, bipolar plates arranged sequentially on the cathode and anode sides with respect to the separation membrane and arranged symmetrically to each other, a gasket, a diffuser, and electrodes. The separation membrane, the pair of bipolar plates, the pair of gaskets, the pair of diffusers, and the pair of electrodes are stacked in a zero-gap manner within the cell frame. Adhesive application lines are formed on the edges of both sides of the cell frame, and the pair of bipolar plates are bonded and fixed to the cell frame by the adhesive applied to the adhesive application lines. The system further includes physical fastening means for fastening the cell frame and the bipolar plate, The physical fastening means includes a first fastening portion protruding from the outer edge of the cell frame and a second fastening portion formed on the outer edge of the bipolar plate and fastened with the first fastening portion. The second fastening portion includes a bent portion that is folded from the outer edge of the bipolar plate toward the cell frame and encloses the outer edge of the cell frame, and a groove portion into which the first fastening portion is fitted, with the central part of the bent portion being cut open. The adhesive-fixed water electrolysis module is characterized in that the first fastening portion has a hook shape with its end protruding outward and is fitted into the groove of the second fastening portion.

2. The adhesive is heat-resistant and alkali-resistant, and is a thermoplastic, room-temperature curing, two-component, or one-component adhesive, as described in claim 1.

3. The depth of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the gasket thickness. The adhesive-fixed water electrolysis module according to claim 2, characterized in that the width of the adhesive application line of the cell frame is determined by the viscosity of the adhesive and is 0.5 to 2 times the depth of the adhesive application line.

4. The cell frame comprises a central portion comprising a housing section that accommodates the separation membrane, a pair of gaskets, a pair of diffusers, and a pair of electrodes, and an outer portion comprising a gas channel for hydrogen and oxygen discharge, and an electrolyte channel for electrolyte inflow and discharge. The bipolar plate is provided with gas channels and electrolyte channels corresponding to the gas channels and electrolyte channels of the cell frame, The adhesive-fixed water electrolysis module according to claim 1, characterized in that a plurality of the single stacks are connected by a bolt crimping method or by a hydraulic press method to constitute a water electrolysis module.

Images