A hydrogen fuel cell and module structure

Abstract

This invention discloses a hydrogen fuel cell and its module structure. The hydrogen fuel cell includes: a first electrode plate; a second electrode plate disposed opposite to the first electrode plate; and a membrane-electrode-diffusion layer-frame assembly disposed between the first and second electrode plates, comprising a proton exchange membrane, a first electrode, a second electrode, a first gas diffusion layer, a second gas diffusion layer, and a frame. The first electrode is bonded to the upper surface of the proton exchange membrane, the first gas diffusion layer is bonded to the upper surface of the first electrode, the second electrode is bonded to the lower surface of the proton exchange membrane, and the second gas diffusion layer is bonded to the lower surface of the second electrode. The length of the first electrode is less than the length of the second electrode. The frame is used to seal and bond the first electrode plate, the second electrode plate, and the proton exchange membrane, with one end of the frame abutting against the end of the first electrode. Stacking and assembling hydrogen fuel cells can form a module structure, greatly improving sealing performance and assembly efficiency.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen fuel cell technology, specifically relating to a hydrogen fuel cell and module structure. Background Technology

[0002] A hydrogen fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. The operating voltage of a single hydrogen fuel cell is generally between 0.6 and 1.0V. Therefore, several hydrogen fuel cell units are usually connected in series and stacked to form a hydrogen fuel cell stack to ensure the output power of the hydrogen fuel cell stack. When stacking hydrogen fuel cell stacks, the plates and membrane electrode assemblies can be stacked alternately, or the plates and membrane electrode assemblies can be combined into hydrogen fuel cell units or modules, and then the cell units or modules are stacked to form a fuel cell stack.

[0003] However, current hydrogen fuel cells have the following defects: (1) Most hydrogen fuel cells use a combination of laser welding of anode plates and cathode plates to form bipolar plates. The bipolar plates and membrane electrode are stacked and pressed in sequence, and the reaction gas is sealed by the sealing rings on the anode plates and cathode plates. The coolant is sealed by laser welding. This sealing method has poor reliability, complicated assembly process and low assembly efficiency; (2) The edge of the gas diffusion layer is mostly pressed above the proton exchange membrane, which can easily cause carbon fiber burrs on the edge of the gas diffusion layer to damage the proton exchange membrane, thus causing hydrogen and oxygen to leak into the fuel cell; (3) The anode electrode and cathode electrode are mostly designed with equal area, and the lack of protons caused by "insufficient gas" or "flooding" of the anode electrode is not considered, which can lead to corrosion of the anode catalyst carbon support; (4) In order to ensure the sealing of the membrane electrode assembly, the resin frame in its encapsulation structure is mostly not a single layer, and it is not combined with the electrode plates for joint sealing and integration, which leads to waste of resin frame material.

[0004] Therefore, there is an urgent need for a hydrogen fuel cell with strong sealing performance, low sealing cost, and high assembly efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing hydrogen fuel cells, such as poor sealing performance, high sealing costs, and low assembly efficiency.

[0006] To achieve the above objectives, the present invention provides a hydrogen fuel cell, comprising: a first electrode plate; a second electrode plate disposed opposite to the first electrode plate; and a membrane-electrode-diffusion layer-frame assembly disposed between the first electrode plate and the second electrode plate, comprising a proton exchange membrane, a first electrode, a second electrode, a first gas diffusion layer, a second gas diffusion layer, and a frame; wherein the first electrode is bonded to the upper surface of the proton exchange membrane, the first gas diffusion layer is bonded to the upper surface of the first electrode, the second electrode is bonded to the lower surface of the proton exchange membrane, the second gas diffusion layer is bonded to the lower surface of the second electrode, and the length of the first electrode is less than the length of the second electrode; the frame is used to seal and bond the first electrode plate and the second electrode plate, and one end of the frame abuts against the end of the first electrode.

[0007] Preferably, the upper surface of the frame includes a first adhesive surface and a third adhesive surface, and the lower surface of the frame includes a second adhesive surface, a fourth adhesive surface, and a fifth adhesive surface; the upper surface of the frame is bonded to the lower surface of the first electrode plate via the first adhesive surface, the upper surface of the frame is bonded to the lower surface of the first protrusion of the first gas diffusion layer via the third adhesive surface, the lower surface of the frame is bonded to the upper surface of the second electrode plate via the second adhesive surface, the lower surface of the frame is bonded to the upper surface of the second protrusion of the second gas diffusion layer via the fourth adhesive surface, and the lower surface of the frame is bonded to the upper surface of the proton exchange membrane via the fifth adhesive surface.

[0008] Preferably, the recessed portion of the first electrode plate abuts against the upper surface of the first gas diffusion layer, forming a first gas flow region and a non-first gas flow region, wherein the non-first gas flow region is used to accommodate and limit the first protrusion of the first gas diffusion layer.

[0009] Preferably, the protrusion of the second electrode plate abuts against the lower surface of the second gas diffusion layer, forming a second gas flow region and a non-second gas flow region, wherein the non-second gas flow region is used to limit the second gas diffusion layer.

[0010] Preferably, the outer sides of the first electrode plate, the second electrode plate, and the frame are filled with a first sealing filler for limiting and sealing the membrane-electrode-diffusion layer-frame assembly.

[0011] Preferably, the groove on the upper surface of the first electrode plate is filled with a second sealing filler to form a compressible sealing structure.

[0012] Preferably, the length of the second electrode is the same as the length of the proton exchange membrane.

[0013] The present invention also provides a module structure, which includes at least a plurality of hydrogen fuel cell units as described above, wherein the hydrogen fuel cell units are stacked and assembled.

[0014] Preferably, the module structure further includes a first sealing filler, a second sealing filler, and a third sealing filler. The first sealing filler fills the outer side of the first electrode plate, the second electrode plate, and the frame. The second sealing filler fills the groove on the upper surface of the first electrode plate. The third sealing filler fills the enclosing area on the upper surface of the first electrode plate and the lower surface of the second electrode plate, thereby bonding the first electrode plate and the second electrode plate of different hydrogen fuel cell to each other.

[0015] Preferably, the plurality of hydrogen fuel cell stacks are assembled to form a plurality of coolant flow zones for loading cooling medium.

[0016] The beneficial effects of this invention are:

[0017] (1) The bonding and sealing of the single-layer resin frame with the proton exchange membrane, the anode plate and the cathode plate respectively replaces the traditional use of sealing rings, which improves the sealing reliability of the reaction gas and reduces the sealing processing cost.

[0018] (2) The first electrode plate, the second electrode plate, and the membrane electrode are bonded together by sealing filler to form an integrated single cell / module structure, which reduces the intermediate process of fuel cell assembly, improves the production cycle of fuel cell assembly, and ensures the sealing reliability of fuel cell.

[0019] (3) For the external circuit, electrons are output from the anode, so the potential on the anode side is generally lower than that on the cathode side. However, if there is a lack of hydrogen protons on the anode side, resulting in insufficient hydrogen supply, the anode potential will gradually be higher than the cathode potential, causing "reverse polarity". This invention makes a differential margin design where the anode electrode is larger than the cathode electrode so that the anode electrode can provide sufficient hydrogen protons, avoid the phenomenon of "reverse polarity" of the anode electrode and the resulting corrosion of the anode catalyst carbon support, and at the same time reduce the amount of catalyst material used.

[0020] (4) By stacking the gas diffusion layer on the rigid resin frame, the carbon fiber burrs at the edge of the gas diffusion layer are prevented from puncturing the proton exchange membrane, thus preventing perforation of the proton exchange membrane and improving the service life of the proton exchange membrane.

[0021] (5) First, the internal components are bonded and sealed by pre-installing adhesive on the internal backing surface. At the same time, the internal areas that are difficult to inject adhesive are pre-installed with sealing filler and bonded by heating and vulcanization. On the outer peripheral open surface, the bonding and sealing are achieved by injecting sealing filler. Multiple sealing and integrated methods are combined to achieve reliable sealing. Attached Figure Description

[0022] Figure 1This is the hydrogen fuel cell structure of the present invention.

[0023] Figure 2 This invention relates to a sealed and integrated encapsulated single-cell structure for hydrogen fuel cells.

[0024] Figure 3 The present invention relates to a hydrogen fuel cell sealing and integrated packaging module structure.

[0025] Among them, 100-first electrode plate, 101-first gas flow region, 102-non-first gas flow region, 200-second electrode plate, 201-second gas flow region, 202-non-second gas flow region, 300-membrane electrode, 301-first electrode, 302-proton exchange membrane, 303-second electrode, 310-first gas diffusion layer, 320-second gas diffusion layer, 330-resin frame, 331-first adhesive surface, 332-second adhesive surface, 333-third adhesive surface, 334-fourth adhesive surface, 335-fifth adhesive surface, 401-coolant flow region, 500-first sealing filler, 600-second sealing filler, 700-third sealing filler, 601-groove on the upper surface of the first electrode plate, L1-overlapping length of the first gas diffusion layer and resin frame, L2-overlapping length of the second gas diffusion layer and resin frame, and L3-overlapping length of the proton exchange membrane and resin frame. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] This invention proposes a hydrogen fuel cell, the single hydrogen fuel cell comprising: a first electrode plate; a second electrode plate disposed opposite to the first electrode plate; and a membrane-electrode-diffusion layer-frame assembly, the membrane-electrode-diffusion layer-frame assembly comprising a proton exchange membrane, a first electrode, a second electrode, a first gas diffusion layer, a second gas diffusion layer, and a frame; the membrane-electrode-diffusion layer-frame assembly being disposed between the first electrode plate and the second electrode plate; wherein, the first electrode is bonded to the upper surface of the proton exchange membrane, the first gas diffusion layer is bonded to the upper surface of the first electrode, the second electrode is bonded to the lower surface of the proton exchange membrane, the second gas diffusion layer is bonded to the lower surface of the second electrode, and the length of the first electrode is less than the length of the second electrode; the frame is used to seal and bond the first electrode plate and the second electrode plate, one end of the frame abutting against the end of the first electrode.

[0028] The upper surface of the frame includes a first adhesive surface and a third adhesive surface, and the lower surface of the frame includes a second adhesive surface, a fourth adhesive surface, and a fifth adhesive surface. The upper surface of the frame is bonded to the lower surface of the first electrode plate via the first adhesive surface, the upper surface of the frame is bonded to the lower surface of the first protrusion of the first gas diffusion layer via the third adhesive surface, the lower surface of the frame is bonded to the upper surface of the second electrode plate via the second adhesive surface, the lower surface of the frame is bonded to the upper surface of the second protrusion of the second gas diffusion layer via the fourth adhesive surface, and the lower surface of the frame is bonded to the upper surface of the proton exchange membrane via the fifth adhesive surface.

[0029] like Figure 1 As shown, a hydrogen fuel cell includes a first electrode 100, a second electrode 200, a membrane electrode 300, a resin frame 330, a first gas diffusion layer 310, and a second gas diffusion layer 320. The first electrode 100 and the second electrode 200 are disposed opposite each other. The membrane electrode 300 includes a first electrode 301, a proton exchange membrane 302, and a second electrode 303 arranged sequentially. The resin frame 330 is disposed between the first electrode 100 and the second electrode 200, and is in contact with the first electrode 100, the second electrode 200, and the membrane electrode 300. The first gas diffusion layer 310 is bonded to the upper surface of the resin frame 330 along a length L1, and its upper surface abuts against a recessed portion of the first electrode 100. The second gas diffusion layer 320 is bonded to the resin frame 330 along a length L2, and for the remaining length, it is bonded to the lower surface of the second electrode 200, abutting against a protruding portion of the second electrode 200. A first gas diffusion layer 310 is placed between the first electrode 301 and the first electrode plate 100 to form a porous substrate with electrical contact. This layer allows reactants to enter the electrode and reaction products to be removed. A second gas diffusion layer 320 is placed between the second electrode 303 and the second electrode plate 200 to form a porous substrate with electrical contact. This layer allows reactants to enter the electrode and reaction products to be removed. The membrane electrode 300 is the site of the hydrogen-oxygen electrochemical reaction, i.e., the power generation unit. The resin frame 330 mainly prevents leakage of reactants and reaction products. The resin frame 330 can be made of materials such as polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), or polyphthalamide (PPA). The first electrode plate 100 is a conductive separator that collects current, separates the oxidant and reductant, and guides the flow of oxidant air on the electrode surface inside the battery. The second electrode plate 200 is a conductive separator that collects current, separates the oxidant and reductant, and guides the flow of reductant hydrogen on the electrode surface inside the battery.

[0030] In some embodiments, in order to prevent carbon fiber burrs at the edge of the gas diffusion layer from damaging the proton exchange membrane, the first gas diffusion layer 310 and the second gas diffusion layer 320 are stacked on the upper and lower surfaces of the resin frame 330, covering the edges of the first gas diffusion layer 310 and the second gas diffusion layer 320, thereby protecting the proton exchange membrane 302.

[0031] In some embodiments, in order to accommodate and limit the first protrusion of the first gas diffusion layer 310, the recess of the first electrode plate 100 abuts against the upper surface of the first gas diffusion layer 310 to form a first gas flow region 101 and a non-first gas flow region 102. The first gas flow region 101 is a collection of channels of various shapes processed on the first electrode plate 100, providing a place for the oxidant air and the reaction product water to enter and exit. The non-first gas flow region 102 is an auxiliary structure processed on the first electrode plate 100, which accommodates and limits the first protrusion of the first gas diffusion layer 310. This region does not provide a place for the entry and exit of reactants and reaction products. The non-first gas flow region 102 may also be filled with sealing filler to ensure the support strength and sealing reliability of this region.

[0032] In some embodiments, to limit and fix the second gas diffusion layer 320, the protrusion of the second electrode plate 200 abuts against the lower surface of the second gas diffusion layer 320 to form a second gas flow region 201 and a non-second gas flow region 202. The second gas flow region 201 is a collection of various shapes processed on the second electrode plate 200, providing a place for the entry and exit of the reducing agent hydrogen and the reaction product water. The non-second gas flow region 202 is an auxiliary structure processed on the second electrode plate 200, which limits and fixes the second gas diffusion layer 320. This area does not provide a place for the entry and exit of reactants and reaction products. The non-second gas flow region 202 may also be filled with sealing filler to ensure the support strength and sealing reliability of this area.

[0033] In some embodiments, to avoid corrosion of the carbon support for the anode catalyst, the length of the anode electrode is designed to be greater than the length of the cathode electrode. The length of the proton exchange membrane is the same as the length of the anode electrode. The first electrode 301 is a porous gas diffusion cathode electrode that receives positive ions (H+) from the electrolyte. + ) and receives electrons from the external circuit to participate in the reduction reaction with air; the second electrode 303 is a porous gas anode electrode, where hydrogen undergoes an oxidation reaction to produce positive ions (H+). + The proton exchange membrane 302 is a membrane that uses protons as the conductive charge, primarily consisting of positive ions (H+). The proton exchange membrane 302 is a membrane that uses protons as the conductive charge. +It provides a transmission channel. The length of the anode electrode is designed to be greater than that of the cathode electrode, with differentiated margin design to avoid the phenomenon of "reverse polarity" of the anode electrode, which would lead to corrosion of the carbon support of the anode electrode catalyst, and at the same time, it can reduce the amount of catalyst material used.

[0034] In some embodiments, to achieve bonding and sealing of internal components, the resin frame 330 includes a first adhesive surface 331, a second adhesive surface 332, a third adhesive surface 333, a fourth adhesive surface 334, and a fifth adhesive surface 335. The first adhesive surface 331 is attached to the resin frame 330 or the adhesive surface of the first electrode plate 100, primarily for bonding the first electrode plate 100 to the resin frame 330 and preventing reactants and reaction products from leaking from the first adhesive surface 331. The second adhesive surface 332 is attached to the resin frame 330 or the adhesive surface of the second electrode plate 200, primarily for bonding the second electrode plate 200 to the resin frame 330 and preventing reactants and reaction products from leaking from the second adhesive surface 332. The third adhesive surface 333 is attached to the first gas diffusion layer 310 or the adhesive surface of the resin frame 330, primarily for bonding the first gas diffusion layer 310 to the resin frame 330 and preventing misalignment or detachment of the diffusion layer during the stacking and pressing of the hydrogen fuel cell. The fourth adhesive surface 334 is attached to the adhesive surface of the second gas diffusion layer 320 or the resin frame 330, mainly to bond the second gas diffusion layer 320 and the resin frame 330, preventing the second gas diffusion layer 320 from misaligning or falling off during the stacking and pressing of hydrogen fuel cells. The fifth adhesive surface 335 is attached to the adhesive surface of the proton exchange membrane 302 or the resin frame 330, mainly to bond the proton exchange membrane 302 and the resin frame 330, preventing hydrogen and oxygen from leaking into each other at the adhesive surface. The length of the third adhesive surface 333 is L1, which is the overlap length between the first gas diffusion layer 310 and the resin frame 330, and L1 can be 2-5 cm. The length of the fourth adhesive surface 334 is L2, which is the overlap length between the second gas diffusion layer 320 and the resin frame 330, and L2 can be 2-5 cm. The length of the fifth adhesive surface 335 is L3, which is the overlap length between the proton exchange membrane 302 and the resin frame 330, and L3 can be 2-10 cm. The bonding methods for the first bonding surface 331, the second bonding surface 332, the third bonding surface 333, the fourth bonding surface 334, and the fifth bonding surface 335 can be hot melt adhesive hot pressing bonding, UV adhesive ultraviolet light curing bonding, pressure sensitive adhesive cold pressing bonding, etc.

[0035] In some embodiments, to form an integrated single cell and ensure the sealing reliability of the hydrogen fuel cell, a first sealing filler 500 and a second sealing filler 600 are included in the hydrogen fuel cell. For example... Figure 2 As shown, Figure 2For a hydrogen fuel cell sealed and integrated single-cell structure, the first sealing filler 500 fills the outer side of the first electrode plate 100, the second electrode plate 200, and the resin frame 330, and is bonded to each other on the outer periphery of the first electrode plate 100, the second electrode plate 200, and the resin frame 330, forming an insulating and gas barrier layer between the first electrode plate 100 and the second electrode plate 200, and integrally bonding the first electrode plate 100, the second electrode plate 200, and the resin frame 330. This layer has good insulation and resistance to gas leakage. The first sealing filler 500 is the outer periphery of this structure and can be formed by injection molding or by pre-filling and heating and vulcanizing. The material of the first sealing filler 500 can be silicone rubber, fluororubber, EPDM rubber, etc.

[0036] The second sealing filler 600 fills the groove 601 on the upper surface of the first electrode plate 100 and adheres to the contact area of ​​the first electrode plate 100. Its main function is to form a sealing structure and a compressible structure, which facilitates the stacking and assembly of hydrogen fuel cells. The second sealing filler 600 is the outer periphery of this structure and can be formed by injection molding or by pre-placing fillers and then curing them by heat. The material of the second sealing filler 600 can be silicone rubber, fluororubber, EPDM rubber, etc.

[0037] The hydrogen fuel cell according to the present invention can also be fabricated into a hydrogen fuel cell module structure, wherein the hydrogen fuel cell is stacked and assembled. For example... Figure 3 As shown, Figure 3 The structure is a sealed and integrated encapsulation module for hydrogen fuel cells, consisting of multiple hydrogen fuel cell stacks and filled with a first sealing filler 500, a second sealing filler 600, and a third sealing filler 700. Figure 2 The hydrogen fuel cell is filled with a third sealing filler 700 and a coolant flow zone 401 on the basis of a sealed and integrated encapsulated single cell structure. The coolant flow zone 401 is a cavity formed by the combination of the first electrode plate 100 and the second electrode plate 200 when the hydrogen fuel cell is stacked. It is filled with coolant to cool the waste heat generated during the operation of the hydrogen fuel cell.

[0038] In some embodiments, to seal and stack different hydrogen fuel cell units, the third sealing filler 700 fills the enclosing area between the upper surface of the first electrode plate 100 and the lower surface of the second electrode plate 200, forming an insulating layer between the first electrode plate 100 and the second electrode plate 200, and bonding the first electrode plate 100 and the second electrode plate 200 together. This can be formed by pre-filling the filler and then curing it by heating, or it can be used to block coolant and prevent coolant leakage. The material of the third sealing filler 700 can be silicone rubber, fluororubber, EPDM rubber, etc. After curing, the bonding process bonds the second electrode plate 200 of the previous hydrogen fuel cell to the first electrode plate 100 of the next hydrogen fuel cell to form an integral structure, facilitating the assembly of the entire hydrogen fuel cell, reducing the number of assembly operations, and also facilitating the maintenance and replacement of different hydrogen fuel cell units. The third sealing filler 700 and the first sealing filler 600 can be made of the same material or different materials. The first filler 600 is used for the single cell structure, and the third filler 700 is used for the module structure. The module structure is pre-filled with the third sealing filler 700 in the area because this area is closed and it is inconvenient to fill it later. The first filler 600 is located on the outermost side of the single cell, and its upper surface is open, providing operable space. Therefore, it can be pre-filled or placed later.

[0039] The hydrogen fuel cell and module structure proposed in this invention uses a first gas diffusion layer and a second gas diffusion layer stacked on the upper and lower surfaces of a resin frame to prevent damage to the proton exchange membrane. Differentiated dimensions of the first electrode, second electrode, and proton exchange membrane prevent corrosion of the anode catalyst carbon support. Sealing filler is filled between the first electrode plate, second electrode plate, and resin frame to seal and encapsulate the hydrogen fuel cell, improving the sealing reliability of the reaction gas and the consistency of the stacking assembly. Sealing filler is also used to fill the groove on the upper surface of the first electrode plate to prevent reaction gas leakage. During the assembly and stacking of hydrogen fuel cells, the sealing filler is used to bond different hydrogen fuel cells into a whole, improving the consistency of the assembly and stacking.

[0040] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A module structure, characterized in that, The module structure includes at least a plurality of hydrogen fuel cell units, which are stacked and assembled. The module structure also includes a first sealing filler, a second sealing filler, and a third sealing filler. The first sealing filler fills the outer side of the first electrode plate, the second electrode plate, and the frame. The second sealing filler fills the groove on the upper surface of the first electrode plate. The third sealing filler fills the enclosing area on the upper surface of the first electrode plate and the lower surface of the second electrode plate, bonding the first electrode plates and second electrode plates of different hydrogen fuel cell units together. Each hydrogen fuel cell unit includes: a first electrode plate. The second electrode plate is disposed opposite to the first electrode plate; A membrane-electrode-diffusion layer-frame assembly disposed between the first electrode plate and the second electrode plate includes a proton exchange membrane, a first electrode, a second electrode, a first gas diffusion layer, a second gas diffusion layer, and a frame. The first electrode is bonded to the upper surface of the proton exchange membrane, the first gas diffusion layer is bonded to the upper surface of the first electrode, the second electrode is bonded to the lower surface of the proton exchange membrane, and the second gas diffusion layer is bonded to the lower surface of the second electrode. The length of the first electrode is less than the length of the second electrode. The frame is used to seal and bond the first electrode plate, the second electrode plate, and the proton exchange membrane. One end of the frame abuts against the end of the first electrode. The upper surface of the frame includes a first adhesive surface and a third adhesive surface, and the lower surface of the frame includes a second adhesive surface, a fourth adhesive surface, and a fifth adhesive surface. The upper surface of the frame is bonded to the lower surface of the first electrode plate through the first adhesive surface, the upper surface of the frame is bonded to the lower surface of the first protrusion of the first gas diffusion layer through the third adhesive surface, the lower surface of the frame is bonded to the upper surface of the second electrode plate through the second adhesive surface, the lower surface of the frame is bonded to the upper surface of the second protrusion of the second gas diffusion layer through the fourth adhesive surface, and the lower surface of the frame is bonded to the upper surface of the proton exchange membrane through the fifth adhesive surface.

2. The module structure as described in claim 1, characterized in that, The recessed portion of the first electrode plate abuts against the upper surface of the first gas diffusion layer, forming a first gas flow region and a non-first gas flow region. The non-first gas flow region is used to accommodate and limit the first protrusion of the first gas diffusion layer.

3. The module structure as described in claim 1, characterized in that, The protrusion of the second electrode plate abuts against the lower surface of the second gas diffusion layer, forming a second gas flow region and a non-second gas flow region. The non-second gas flow region is used to limit the second gas diffusion layer.

4. The module structure as described in claim 1, characterized in that, The outer sides of the first electrode plate, the second electrode plate, and the frame are filled with a first sealing filler for limiting and sealing the membrane-electrode-diffusion layer-frame assembly.

5. The module structure as described in claim 1, characterized in that, The groove on the upper surface of the first electrode plate is filled with a second sealing filler to form a compressible sealing structure.

6. The module structure as described in claim 1, characterized in that, The length of the second electrode is the same as the length of the proton exchange membrane.

7. The module structure as described in claim 1, characterized in that, The stacked assembly of the several hydrogen fuel cell units forms several coolant flow zones to accommodate the cooling medium.

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