CN117248233A - PEM (proton exchange membrane) electrolytic tank assembly method and PEM electrolytic tank - Google Patents
PEM (proton exchange membrane) electrolytic tank assembly method and PEM electrolytic tank Download PDFInfo
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- CN117248233A CN117248233A CN202311384086.8A CN202311384086A CN117248233A CN 117248233 A CN117248233 A CN 117248233A CN 202311384086 A CN202311384086 A CN 202311384086A CN 117248233 A CN117248233 A CN 117248233A
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- 239000012528 membrane Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000009792 diffusion process Methods 0.000 claims abstract description 90
- 238000007731 hot pressing Methods 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 229920000297 Rayon Polymers 0.000 claims abstract description 5
- 238000009826 distribution Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 18
- 230000003197 catalytic effect Effects 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 16
- 238000004073 vulcanization Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000007822 coupling agent Substances 0.000 claims description 9
- 239000003566 sealing material Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 238000005868 electrolysis reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 91
- 239000003054 catalyst Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229920000557 Nafion® Polymers 0.000 description 1
- DSVGQVZAZSZEEX-UHFFFAOYSA-N [C].[Pt] Chemical compound [C].[Pt] DSVGQVZAZSZEEX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N iridium(IV) oxide Inorganic materials O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
- C25B11/036—Bipolar electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention relates to the technical field of hydrogen production devices by water electrolysis, and provides a PEM (proton exchange membrane) electrolytic cell assembly method and a PEM electrolytic cell, wherein the PEM electrolytic cell assembly method comprises the steps of carrying out viscose hot pressing on an anode frame, a membrane electrode and a cathode frame which are sequentially stacked to form a membrane electrode assembly; sequentially stacking the bipolar plate, the anode gas diffusion layer, the membrane electrode assembly and the cathode gas diffusion layer to form an electrolytic cell; the anode end pressing plate, the plurality of electrolytic cells and the cathode end pressing plate are sequentially stacked and extruded and fixed to form the PEM electrolytic cell, before stacking the PEM electrolytic cell, the anode frame, the membrane electrode and the cathode frame are subjected to glue hot pressing, so that the anode frame, the membrane electrode and the cathode frame can be integrated, the problems of dislocation and reverse direction caused by more assembly steps during assembly of the PEM electrolytic cell are avoided, and the assembly efficiency of the PEM electrolytic cell is improved.
Description
Technical Field
The invention relates to the technical field of hydrogen production devices by water electrolysis, in particular to a PEM (proton exchange membrane) electrolytic tank assembly method and a PEM electrolytic tank.
Background
Currently, PEM electrolysers consist of several cells in series, the main components of which include a membrane electrode (CCM) consisting of a proton exchange membrane, an anode catalytic layer and a cathode catalytic layer, an anode gas diffusion layer, a cathode gas diffusion layer, a bipolar plate, etc.
The existing PEM electrolyzer assembly process is to stack membrane electrodes, anode gas diffusion layers and cathode gas diffusion layers as separate modules in an electrolyzer one by one to assemble an electrolyzer, and then repeatedly stack the electrolyzer to form a PEM electrolyzer structure containing a plurality of electrolyzers, and locking the electrolyzer structure by using a screw rod after the stacking is completed.
The assembly process has a plurality of assembly steps, the problems of dislocation and reverse direction among all the components are easy to occur, and the assembly efficiency of the PEM electrolytic tank is seriously affected.
Disclosure of Invention
The invention provides a PEM (proton exchange membrane) electrolytic cell assembly method and a PEM electrolytic cell, which solve or at least partially solve the technical defects in the prior art.
A first aspect of the present invention provides a PEM electrolyzer assembly method comprising the steps of:
performing adhesive hot pressing on the anode frame, the membrane electrode and the cathode frame which are sequentially stacked to form a membrane electrode assembly;
sequentially stacking a bipolar plate, an anode gas diffusion layer, the membrane electrode assembly and a cathode gas diffusion layer to form an electrolytic cell;
and stacking the anode end pressing plate, the electrolytic cells and the cathode end pressing plate in sequence and extruding and fixing the anode end pressing plate, so as to form the PEM electrolytic cell.
According to the method for assembling the PEM electrolytic cell provided by the invention, the bipolar plate, the anode gas diffusion layer, the membrane electrode assembly and the cathode gas diffusion layer are sequentially stacked, and before the electrolytic cell is formed, the method further comprises the following steps:
and welding and fixing the anode gas diffusion layer and the anode side of the bipolar plate or the cathode gas diffusion layer and the cathode side of the bipolar plate.
According to the assembly method of the PEM electrolytic cell provided by the invention, the bipolar plate, the anode gas diffusion layer, the membrane electrode assembly and the cathode gas diffusion layer are sequentially stacked to form the electrolytic cell, and the assembly method comprises the following steps of:
and vulcanizing, bonding and fixing one side of the bipolar plate with the anode gas diffusion layer and one side of the membrane electrode assembly with the anode frame or one side of the bipolar plate with the cathode gas diffusion layer and one side of the membrane electrode assembly with the cathode frame.
According to the PEM electrolytic tank assembly method provided by the invention, the vulcanization bonding comprises the following steps:
injecting the sealing material mixed rubber into a preforming die to perform preforming to form a preforming adhesive tape, wherein the temperature in the preforming process is 140-200 ℃ and the time is 5-10 min;
coating a coupling agent at the bonding position of the bipolar plate and the membrane electrode assembly;
sequentially placing the bipolar plate coated with the coupling agent, the preformed adhesive tape and the membrane electrode assembly coated with the coupling agent into a transfer mold for vulcanization, wherein the temperature in the vulcanization process is 90-120 ℃ and the time is 5-6 min;
and (3) putting the vulcanized bipolar plate and the vulcanized membrane electrode assembly into a hot air oven for drying and fixing, wherein the temperature in the drying process is 130-150 ℃ and the time is 30min.
According to the assembly method of the PEM electrolytic tank provided by the invention, the anode frame, the membrane electrode and the cathode frame which are sequentially stacked are subjected to viscose hot pressing to form a membrane electrode assembly, and the assembly method comprises the following steps:
correspondingly arranging the anode frame and the cathode frame on the anode side and the cathode side of the membrane electrode respectively;
and coating adhesive on one sides of the anode frame and the cathode frame, which are close to the membrane electrode, respectively, and placing the anode frame, the membrane electrode and the cathode frame under a hot press for hot pressing to form the membrane electrode assembly.
According to the assembly method of the PEM electrolytic cell provided by the invention, the anode frame, the membrane electrode and the cathode frame which are sequentially stacked are subjected to glue hot pressing, and before the membrane electrode assembly is formed, the assembly method further comprises the following steps:
and respectively coating an anode catalytic layer and a cathode catalytic layer on two sides of the proton exchange membrane to form the membrane electrode.
According to the assembly method of the PEM electrolytic tank provided by the invention, the anode side of the bipolar plate comprises a concave anode flow field region arranged in the middle part and an anode distribution region arranged at the periphery, and the anode flow field region is communicated with the anode distribution region;
the cathode side of the bipolar plate comprises a concave cathode flow field region arranged in the middle part and a cathode distribution region arranged at the periphery, and the cathode flow field region is communicated with the cathode distribution region.
According to the method for assembling the PEM electrolytic cell provided by the invention, the welding and fixing of the anode gas diffusion layer and the anode side of the bipolar plate or the welding and fixing of the cathode gas diffusion layer and the cathode side of the bipolar plate are carried out, and the method specifically comprises the following steps:
and welding and fixing the anode gas diffusion layer and the anode flow field region or the cathode gas diffusion layer and the cathode flow field region.
According to one PEM electrolyser assembly method provided by the present invention, said anode gas diffusion layer, said cathode gas diffusion layer are flush with said anode side surface, said cathode side surface, respectively, of said bipolar plate.
A second aspect of the invention provides a PEM electrolyser assembled based on the above-described assembly method.
The beneficial effects are that: the assembly method of the PEM electrolytic cell comprises the steps of carrying out viscose hot-pressing on an anode frame, a membrane electrode and a cathode frame which are sequentially stacked to form a membrane electrode assembly; sequentially stacking the bipolar plate, the anode gas diffusion layer, the membrane electrode assembly and the cathode gas diffusion layer to form an electrolytic cell; the anode end pressing plate, a plurality of electrolytic cells and the cathode end pressing plate are stacked in sequence and are extruded and fixed to form the PEM electrolytic cell. Before stacking the PEM electrolytic cell, the anode frame, the membrane electrode and the cathode frame are subjected to glue hot pressing, so that the anode frame, the membrane electrode and the cathode frame are integrated, the problem that dislocation and reverse direction occur due to multiple assembly steps when the PEM electrolytic cell is assembled is avoided, and the assembly efficiency of the PEM electrolytic cell is improved.
Further, in the PEM electrolyzer provided by the present invention, since the PEM electrolyzer is assembled and formed by the assembly method of the PEM electrolyzer as described above, various advantages as described above are also provided.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of an electrolytic cell structure provided in an embodiment of the present invention;
FIG. 2 is a first angular block diagram of a bipolar plate in accordance with an embodiment of the present invention;
fig. 3 is a second angular block diagram of a bipolar plate in an embodiment of the invention.
Reference numerals:
1. a membrane electrode assembly; 11. a membrane electrode; 111. a proton exchange membrane; 112. an anode catalytic layer; 113. a cathode catalytic layer; 12. an anode frame; 13. a cathode frame;
2. an anode gas diffusion layer;
3. a cathode gas diffusion layer;
4. a bipolar plate; 41. an anode flow field region; 42. an anode distribution region; 43. a cathode flow field region; 44. a cathode distribution region;
5. and a sealant layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Currently, PEM electrolysers consist of several cells in series, the main components of which include a membrane electrode (CCM) consisting of a proton exchange membrane, an anode catalytic layer and a cathode catalytic layer, an anode gas diffusion layer, a cathode gas diffusion layer, a bipolar plate, etc.
The existing PEM electrolyzer assembly process is to stack membrane electrodes, anode gas diffusion layers and cathode gas diffusion layers as separate modules in an electrolyzer one by one to assemble an electrolyzer, and then repeatedly stack the electrolyzer to form a PEM electrolyzer structure containing a plurality of electrolyzers, and locking the electrolyzer structure by using a screw rod after the stacking is completed.
The assembly process has a plurality of assembly steps, the problems of dislocation and reverse direction among all the components are easy to occur, and the assembly efficiency of the PEM electrolytic tank is seriously affected.
In the embodiment of the invention, before stacking the PEM electrolytic cell, the anode frame, the membrane electrode and the cathode frame are subjected to glue hot pressing, so that the anode frame, the membrane electrode and the cathode frame are integrated, the problems of dislocation and reverse direction caused by more assembly steps when the PEM electrolytic cell is assembled are avoided, and the assembly efficiency of the PEM electrolytic cell is improved.
The PEM electrolyzer assembly method and electrolyzer of the present invention are described below in conjunction with fig. 1-3.
As shown in fig. 1, the PEM electrolyzer assembly method provided in some embodiments of the present invention, corresponding to a single electrolyzer structure exploded schematic view, comprises the steps of:
and performing adhesive hot pressing on the anode frame 12, the membrane electrode 11 and the cathode frame 13 which are sequentially stacked to form the membrane electrode assembly 1. The anode frame 12 and the cathode frame 13 are hollow frame structures, and after being pasted, the reaction process of the anode catalytic layer and the cathode catalytic layer at two sides of the membrane electrode 11 is not affected. The specific hot pressing equipment can use the hot press to carry out hot pressing, when carrying out viscose hot pressing, can fix a position through auxiliary fixtures, for example uses positioning frame to fix a position the position of positive pole frame 12, membrane electrode 11 and negative pole frame 13, prevents to produce dislocation between positive pole frame 12, membrane electrode 11 and the negative pole frame 13.
The bipolar plate 4, the anode gas diffusion layer 2, the membrane electrode assembly 1, and the cathode gas diffusion layer 3 are stacked in this order to form an electrolytic cell. Wherein, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are made of metal materials, such as porous titanium plates, titanium felts and the like. The membrane electrode 11 may be a proton exchange membrane, and a structure of coating a platinum carbon cathode catalytic layer and an iridium black anode catalytic layer on two sides of the membrane or other membrane electrodes 11 used in the existing PEM electrolyzer, and the proton exchange membrane may be a proton exchange membrane represented by a perfluorosulfonic acid membrane (Nafion membrane), for example, one of Nafion115, 117, 211 and 212.
The anode end pressing plate, a plurality of electrolytic cells and the cathode end pressing plate are stacked in sequence and are extruded and fixed to form the PEM electrolytic cell. The stacking and compression-fixing forms and methods are used with existing PEM electrolyser stacking and compression forms and methods and will not be described in detail herein.
In the assembly method of the PEM electrolytic cell in the embodiment, before stacking the PEM electrolytic cell, the anode frame 12, the membrane electrode 11 and the cathode frame 13 are subjected to glue hot pressing, so that the anode frame 12, the membrane electrode 11 and the cathode frame 13 are integrated, the problems of dislocation and reverse direction caused by more assembly steps during assembly of the PEM electrolytic cell are avoided, and the assembly efficiency of the PEM electrolytic cell is improved.
In some embodiments of the present invention, the bipolar plate 4, the anode gas diffusion layer 2, the membrane electrode assembly 1 and the cathode gas diffusion layer 3 are stacked in order, and before forming the electrolytic cell, the method further comprises:
only the anode gas diffusion layer 2 and the anode side of the bipolar plate 4 are welded and fixed, or only the cathode gas diffusion layer 3 and the cathode side of the bipolar plate 4 are welded and fixed, or the anode gas diffusion layer 2 and the anode side of the bipolar plate 4, and the cathode gas diffusion layer 3 and the cathode side of the bipolar plate 4 are welded and fixed at the same time.
Specifically, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are respectively placed on the anode side and the cathode side of the bipolar plate 4 correspondingly, then the plane where the anode gas diffusion layer 2 contacts with the anode side of the bipolar plate 4 is fixed by adopting a laser welding or spot welding mode, and the cathode gas diffusion layer 3 and the cathode side of the bipolar plate 4 are fixed by adopting the same welding mode.
In this embodiment, the anode gas diffusion layer 2, the bipolar plate 4 and the cathode gas diffusion layer 3 are fixed by adopting a welding manner, so that a single component is not required to be repeatedly assembled for multiple times in the assembly process of the PEM electrolytic cell, the complexity of the assembly process is reduced, and the problems of displacement and dislocation of the gas diffusion layer and the bipolar plate 4 and unsmooth adhesion with the flow field region of the bipolar plate 4 in the assembly process are avoided.
Further, the bipolar plate 4, the anode gas diffusion layer 2, the membrane electrode assembly 1 and the cathode gas diffusion layer 3 are stacked in sequence to form an electrolytic cell, which specifically comprises the following steps:
the bipolar plate 4 is fixed by vulcanization adhesion to the side having the anode gas diffusion layer 2 and the side having the anode frame 12 of the membrane electrode assembly 1. Alternatively, the bipolar plate 4 is vulcanized and bonded to the cathode gas diffusion layer 3 side and the cathode frame 13 side of the membrane electrode assembly 1. In the vulcanization bonding process, sealing material adhesives such as ethylene propylene diene monomer or fluororubber can be used for bonding through a vulcanization process.
As shown in fig. 1, in one possible manner, a sealing groove is formed at the outer contour line of the bipolar plate 4, a glue injection through hole is formed on the anode frame 12 or the cathode frame 13 on the membrane electrode assembly 1, and a sealing material glue is injected into the sealing groove of the bipolar plate 4 through the glue injection through hole in an injection manner, so that a sealing material glue layer 5 is formed between the membrane electrode assembly 1 and the bipolar plate 4, the membrane electrode assembly 1 and the bipolar plate 4 are further integrated, and repeated assembly is not needed in the assembly process of the PEM electrolytic cell, so that the complexity of the assembly process is reduced, and the problem of displacement and dislocation of the membrane electrode assembly 1 and the bipolar plate 4 in the assembly process is avoided.
For the mode of vulcanizing, bonding and fixing between the membrane electrode assembly 1 and the bipolar plate 4, the sealing material adhesive layer 5 is formed between the membrane electrode assembly 1 and the bipolar plate 4, the membrane electrode assembly 1 and the bipolar plate 4 form a whole, and the sealing material adhesive layer 5 forms a sealing structure.
In other embodiments, the vulcanization bonding step specifically includes:
and injecting the sealant compound into a preforming die to perform preforming, so as to form a preformed adhesive tape. Wherein, ethylene propylene diene monomer or fluororubber can be used as the sealing material rubber compound, the temperature in the preforming process is 140-200 ℃ and the time is 5-10 min;
coating a coupling agent at the bonding position of the bipolar plate 4 and the membrane electrode assembly 1;
sequentially placing the bipolar plate 4 coated with the coupling agent, the preformed adhesive tape and the membrane electrode assembly 1 coated with the coupling agent into a transfer mold for vulcanization, wherein the temperature in the vulcanization process is 90-120 ℃ and the time is 5-6 min;
and (3) putting the vulcanized bipolar plate 4 and the membrane electrode assembly 1 into a hot air oven for drying and fixing, wherein the temperature in the drying process is 130-150 ℃ and the time is 30min.
For the above-mentioned anode frame 12, membrane electrode 11 and cathode frame 13 which are sequentially stacked, the membrane electrode assembly 1 is formed by performing glue hot pressing, and in some embodiments of the present invention, the method specifically includes the following steps:
the anode frame 12 and the cathode frame 13 are respectively and correspondingly arranged on the anode side and the cathode side of the membrane electrode 11;
and respectively coating adhesive on one sides of the anode frame 12 and the cathode frame 13, which are close to the membrane electrode 11, and placing the anode frame 12, the membrane electrode 11 and the cathode frame 13 under a hot press for hot pressing to form the membrane electrode assembly 1.
Before the above-mentioned sequentially stacked anode frame 12, membrane electrode 11 and cathode frame 13 are subjected to glue hot pressing to form the membrane electrode assembly 1, some embodiments of the present invention further include:
the anode catalyst layer 112 and the cathode catalyst layer 113 are coated on both sides of the proton exchange membrane 111, respectively, to form the membrane electrode 11.
Specifically, the slurry containing the anode catalyst and the slurry containing the cathode catalyst are respectively coated on both sides of the proton exchange membrane. The anode catalyst layer slurry includes an anode catalyst, which in one embodiment includes one or more of IrO2, ruO2, pt black, a binder including a perfluorosulfonic acid resin solution, and a dispersant including one or more of deionized water, ethanol, isopropanol. The cathode catalyst layer slurry includes a cathode catalyst, in one embodiment, the cathode catalyst includes one or more of Pt/C, pt black, a binder including a perfluorosulfonic acid resin solution, and a dispersant including one or more of deionized water, ethanol, and isopropanol.
As shown in fig. 2 and 3, in some embodiments of the present invention, the bipolar plate 4 specifically includes:
the anode side of the bipolar plate 4 includes a recessed anode flow field region 41 in the middle and an anode distribution region 42 in the periphery, the anode flow field region 41 communicating with the anode distribution region 42, and the cathode side of the bipolar plate 4 includes a recessed cathode flow field region 43 in the middle and a cathode distribution region 44 in the periphery, the cathode flow field region 43 communicating with the cathode distribution region.
Specifically, the anode flow field region 41 and the cathode flow field region 43 of the bipolar plate 4 are disposed in the middle of the bipolar plate 4, and are concave sink structures, that is, the peripheral area of the bipolar plate 4 is higher than the flow field area in the middle, and the concave sink structures in the middle are used for placing the anode gas diffusion layer 2 and the cathode gas diffusion layer 3.
A seal groove is arranged at the outer contour line of the bipolar plate 4. The flow channel depth of the anode flow field region 41 and the cathode flow field region 43 is 0.4-0.6 mm, the flow channel width is 0.8-1.2 mm, the area of the anode flow field region 41 and the cathode flow field region 43 is larger than that of the gas diffusion layer, and the welding fixation with the gas diffusion layer is facilitated.
Further, in the thickness direction of the bipolar plate 4, the difference between the heights of the anode flow field region 41 and the cathode flow field region 43 of the bipolar plate 4 and the peripheral height of the corresponding side is 0.4 to 0.6mm, where the difference in height is the difference on one side and the difference in height on the other side is the same. The thicknesses of the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are 0.4-0.6 mm, so that the whole appearance of the bipolar plate 4 is smooth after the welding and fixing of the anode gas diffusion layer 2, the cathode gas diffusion layer 3 and the bipolar plate 4 are finished.
The two side peripheries of the bipolar plate 4 are respectively provided with an anode distribution area 42 and a cathode distribution area 44, and the anode distribution area 42 and the cathode distribution area 44 can be arranged into a plurality of diversion trench structures or diversion boss structures which are arranged in a staggered manner, so that the electrolyzed water entering from the anode side can be uniformly distributed under the action of diversion trenches or diversion bosses, or the hydrogen generated from the cathode side can be uniformly discharged under the action of the diversion trenches or diversion bosses.
In the above embodiment, the anode gas diffusion layer 2 and the anode distribution area 42 are arranged in a staggered manner, so that the diffusion efficiency of the electrolytic water on the anode side reaching the anode catalytic layer surface of the membrane electrode 11 through the anode gas diffusion layer 2 can be improved, and the problem of film burning caused by water shortage on the anode catalytic layer surface of the membrane electrode 11 is avoided.
In the above welding and fixing the anode gas diffusion layer 2 and the anode side of the bipolar plate 4 or the cathode gas diffusion layer 3 and the cathode side of the bipolar plate 4, the possible modes specifically include:
the anode gas diffusion layer 2 is welded to the anode flow field region 41, or the cathode gas diffusion layer 3 is welded to the cathode flow field region 43. After the welding and fixing, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are ensured to be respectively flush with the anode side surface and the cathode side surface of the bipolar plate 4. After the assembly of the electrolytic cell is completed, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are respectively kept flush with the anode side surface and the cathode side surface of the bipolar plate 4, so that the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are not extruded excessively, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are not damaged to the membrane electrode 11 under larger extrusion force, and the risk of membrane perforation is avoided.
A second aspect of the invention provides a PEM electrolyser assembled based on the above-described assembly method.
In another aspect, an embodiment of the present invention further provides a PEM electrolyzer, which is assembled by the PEM electrolyzer assembly method provided in any of the above embodiments. The development of the beneficial effects of the PEM electrolyzer in the present embodiment is generally similar to that of the PEM electrolyzer assembly method described above and will not be repeated here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A PEM electrolyzer assembly method comprising the steps of:
carrying out viscose hot pressing on the anode frame (12), the membrane electrode (11) and the cathode frame (13) which are sequentially stacked to form a membrane electrode assembly (1);
sequentially stacking a bipolar plate (4), an anode gas diffusion layer (2), the membrane electrode assembly (1) and a cathode gas diffusion layer (3) to form an electrolytic cell;
and stacking the anode end pressing plate, the electrolytic cells and the cathode end pressing plate in sequence and extruding and fixing the anode end pressing plate, so as to form the PEM electrolytic cell.
2. A PEM electrolyzer assembly process in accordance with claim 1, characterized in that,
the bipolar plate (4), the anode gas diffusion layer (2), the membrane electrode assembly (1) and the cathode gas diffusion layer (3) are sequentially stacked, and before the electrolytic cell is formed, the method further comprises the steps of:
and welding and fixing the anode gas diffusion layer (2) and the anode side of the bipolar plate (4) or welding and fixing the cathode gas diffusion layer (3) and the cathode side of the bipolar plate (4).
3. PEM electrolyser assembly method according to claim 2, characterized in that said bipolar plates (4), anode gas diffusion layers (2), membrane electrode assemblies (1) and cathode gas diffusion layers (3) are stacked in sequence, forming an electrolyser, comprising the steps of:
and vulcanizing, bonding and fixing one side of the bipolar plate (4) with the anode gas diffusion layer (2) and one side of the membrane electrode assembly (1) with the anode frame (12) or one side of the bipolar plate (4) with the cathode gas diffusion layer (3) and one side of the membrane electrode assembly (1) with the cathode frame (13).
4. A PEM electrolyzer assembly process as recited in claim 3 characterized in that,
the vulcanization bonding specifically comprises the following steps:
injecting the sealing material mixed rubber into a preforming die to perform preforming to form a preforming adhesive tape, wherein the temperature in the preforming process is 140-200 ℃ and the time is 5-10 min;
coating a coupling agent at the bonding position of the bipolar plate (4) and the membrane electrode assembly (1);
sequentially placing the bipolar plate (4) coated with the coupling agent, the preformed adhesive tape and the membrane electrode assembly (1) coated with the coupling agent into a transfer mold for vulcanization, wherein the temperature in the vulcanization process is 90-120 ℃ and the time is 5-6 min;
and (3) putting the vulcanized bipolar plate (4) and the vulcanized membrane electrode assembly (1) into a hot air oven for drying and fixing, wherein the temperature in the drying process is 130-150 ℃ and the time is 30min.
5. A PEM electrolyser assembly method according to any of claims 1-4, characterized in that the anode frame (12), the membrane electrode (11) and the cathode frame (13) stacked in sequence are subjected to glue hot-pressing, forming a membrane electrode assembly (1), comprising the steps of:
correspondingly arranging the anode frame (12) and the cathode frame (13) on the anode side and the cathode side of the membrane electrode (11) respectively;
and coating adhesive on one side of the anode frame (12) and one side of the cathode frame (13) close to the membrane electrode (11), and placing the anode frame (12), the membrane electrode (11) and the cathode frame (13) under a hot press for hot pressing to form the membrane electrode assembly (1).
6. The PEM electrolyser assembly method according to claim 5, wherein said glue hot-pressing of the anode frame (12), the membrane electrode (11) and the cathode frame (13) stacked in sequence, before forming the membrane electrode assembly (1), further comprises:
and respectively coating an anode catalytic layer (112) and a cathode catalytic layer (113) on two sides of the proton exchange membrane (111) to form the membrane electrode (11).
7. A PEM electrolyzer assembly process in accordance with claim 2 wherein,
the anode side of the bipolar plate (4) comprises a concave anode flow field region (41) arranged in the middle and an anode distribution region (42) arranged at the periphery, and the anode flow field region (41) is communicated with the anode distribution region (42);
the cathode side of the bipolar plate (4) comprises a concave cathode flow field region (43) arranged in the middle and a cathode distribution region (44) arranged at the periphery, and the cathode flow field region (43) is communicated with the cathode distribution region (44).
8. A PEM electrolyzer assembly process in accordance with claim 7 wherein,
the welding and fixing the anode gas diffusion layer (2) and the anode side of the bipolar plate (4) or the cathode gas diffusion layer (3) and the cathode side of the bipolar plate (4) specifically comprises the following steps:
-welding the anode gas diffusion layer (2) to the anode flow field region (41) or the cathode gas diffusion layer (3) to the cathode flow field region (43).
9. PEM electrolyser assembly method according to claim 2 or 8, characterized in that the anode gas diffusion layer (2), the cathode gas diffusion layer (3) are flush with the anode side surface, the cathode side surface, respectively, of the bipolar plate (4).
10. PEM electrolyser, characterized in that it is assembled and formed on the basis of the assembly method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311384086.8A CN117248233A (en) | 2023-10-24 | 2023-10-24 | PEM (proton exchange membrane) electrolytic tank assembly method and PEM electrolytic tank |
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| CN202311384086.8A CN117248233A (en) | 2023-10-24 | 2023-10-24 | PEM (proton exchange membrane) electrolytic tank assembly method and PEM electrolytic tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223058A (en) * | 2024-05-27 | 2024-06-21 | 康明斯氢能(上海)有限公司 | Bipolar plate structure for electrolytic cell and electrolytic cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223058A (en) * | 2024-05-27 | 2024-06-21 | 康明斯氢能(上海)有限公司 | Bipolar plate structure for electrolytic cell and electrolytic cell |
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