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CN-121642014-B - Single cell packaging structure and preparation method thereof

CN121642014BCN 121642014 BCN121642014 BCN 121642014BCN-121642014-B

Abstract

The invention discloses a single cell packaging structure and a preparation method thereof, and relates to the technical field of single cells, wherein a membrane electrode comprises a proton exchange membrane and catalyst layers positioned on two sides of the proton exchange membrane, one side of the catalyst layer is bonded with a hot melt adhesive layer of a single-sided adhesive frame, the other side of the catalyst layer is lapped on the double-sided adhesive frame, the hot melt adhesive layer of the single-sided adhesive frame bonds the excess part of the catalyst layer to the double-sided adhesive frame, polar plates are respectively arranged on the upper side and the lower side of the double-sided hot melt adhesive frame, a gas diffusion layer is formed between the membrane electrode and the two polar plates, and the obtained single cell has good sealing effect and is not easy to leak reaction medium.

Inventors

  • WANG YONG
  • Hao Linhong
  • GUAN LEXIN
  • SUN CHANGQING
  • Yin Youpeng

Assignees

  • 山东同有新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (6)

  1. 1. The single cell packaging structure comprises a membrane electrode, wherein the membrane electrode comprises a proton exchange membrane and catalyst layers positioned on two sides of the proton exchange membrane, and is characterized in that the catalyst layers on one side are bonded with a hot melt adhesive layer of a single-sided adhesive frame, the catalyst layers on the other side are lapped on the double-sided adhesive frame, the hot melt adhesive layer of the single-sided adhesive frame bonds the catalyst layers, the excess part of the catalyst layers is bonded with the double-sided adhesive frame, polar plates are respectively arranged on the upper side and the lower side of the double-sided adhesive frame, and a gas diffusion layer is arranged between the membrane electrode and the two polar plates; The single-sided adhesive frame is prepared by taking polyphenylene sulfide as a base material, coating a hot melt adhesive I on one side, and removing an active area through die cutting, wherein the hot melt adhesive I consists of acid modified polyolefin resin, epoxidized polybutadiene resin, isocyanate curing agent and diluent in a weight ratio of 100:5-10:0.5-3:50-100, and the diluent is a mixed solvent of dimethylbenzene and ethyl acetate; the preparation method of the single-sided adhesive frame comprises the following steps: S01, preparation of hot melt adhesive Mixing acid modified polyolefin resin, epoxidized polybutadiene resin, isocyanate curing agent and diluent according to a proportion, stirring for 20-40 min at normal temperature and 500-1000 r/min, and uniformly mixing to obtain hot melt adhesive; S02, preparation of single-sided adhesive frame Filtering the hot melt adhesive solution prepared in the step S01, coating the hot melt adhesive solution on a polyphenylene sulfide substrate by a scraper coater or a CED coater for 9-25 mu m, attaching a release film after the hot melt adhesive solution is completely dried, and winding and curing the hot melt adhesive solution to obtain a single-sided adhesive frame after curing; The double-sided adhesive frame is prepared by taking polyphenyl ether or polyphenylene sulfide as a base material, coating hot melt adhesive II on two sides, and removing an active area through die cutting, wherein the hot melt adhesive II consists of high-melting-point polyolefin resin, an epoxidized thermoplastic elastomer, a modifier and an antioxidant in a weight ratio of 100:10-30:0.5-5:0.5-3; The high-melting-point polyolefin resin is prepared by grafting maleic anhydride on the polyolefin resin, and the melting point of the high-melting-point polyolefin resin is 140-165 ℃; The modifier is an epoxy acrylic polymer; The epoxidized thermoplastic elastomer is an epoxidized thermoplastic elastomer; The antioxidant is one or two mixtures of hindered phenols or aromatic amines; The preparation method of the double-sided adhesive frame comprises the following steps: s03, mixing and premixing: preheating and drying high-melting-point acid modified polypropylene resin, an epoxidized thermoplastic elastomer, an epoxy acrylic polymer and an antioxidant for 2 hours at 80-90 ℃, then putting the mixture into a premixing machine, and mixing the mixture at a low speed for 10-15 min at 60-80 ℃ to obtain a premix; S04, melt blending and granulating: Transferring the premix into a double-screw extruder, blending at 160-190 ℃ and screw speed of 100-400 rpm, extruding the homogenized molten colloid into strips through a die head, cooling through a water tank, and granulating to obtain hot melt adhesive particles with particle size of 3-5 mm; S05, hot melt casting coating: And (3) coating the hot melt adhesive particles on one side of a polyphenyl ether or polyphenylene sulfide substrate by a single screw extrusion coater to form a hot melt adhesive layer with the thickness of 30-50 mu m, cooling and rolling to obtain a frame material with one side coated with the hot melt adhesive, and preparing the hot melt adhesive on the other side by the same method to obtain the double-sided adhesive frame material.
  2. 2. The single-sided tape of claim 1, wherein the single-sided tape comprises a substrate layer having a thickness of 16-75 μm and a hot melt adhesive layer having a thickness of 9-25 μm.
  3. 3. The single cell packaging structure of claim 1, wherein the double-sided tape frame has a thickness of 150-260 μm, wherein the substrate layer has a thickness of 50-188 μm, and the two hot melt adhesive layers have a thickness of 30-50 μm.
  4. 4. A method for manufacturing the single cell package structure as claimed in any one of claims 1 to 3, comprising the steps of: S1, preparing and die-cutting a single-sided adhesive frame Die cutting is carried out on the frame material coated with the hot melt adhesive I on one side, an active area is removed, a single-sided adhesive frame with a frame-shaped edge is obtained, and the die cutting precision is controlled to be +/-0.05 mm; s2, preparation of lower frame and membrane electrode single-layer structure Placing the single-sided adhesive tape frame prepared in the step S1 below, and carrying out hot pressing on the single-sided adhesive tape frame and the membrane electrode to prepare a single-layer frame structure of the lower frame and the membrane electrode; S3, preparing the packaged membrane electrode Die-cutting the double-sided coated hot melt adhesive II frame material according to the same die-cutting process as that of the step S1, and then performing opposite-sticking hot-pressing on the single-layer frame adhesive film obtained in the step S2 to obtain a packaged membrane electrode; s4, preparation of single cell And (3) die-cutting the packaged membrane electrode obtained in the step (S3) into a corresponding shape again, and then hot-pressing the membrane electrode and the cathode and anode plates together to obtain the single cell.
  5. 5. The method of claim 4, wherein the hot-pressing temperature in the step S2 is 110-130 ℃, the hot-pressing pressure is 0.4-0.8 MPa, and the hot-pressing time is 30-60S.
  6. 6. The method of manufacturing a single cell package structure according to claim 4, wherein the hot pressing temperature in the step S3 is 120-140 ℃, the hot pressing pressure is 0.6-1.0 MPa, and the hot pressing time is 30-60S; The hot pressing temperature in the step S4 is 140-170 ℃ and the hot pressing time is 60-120S.

Description

Single cell packaging structure and preparation method thereof Technical Field The invention relates to the technical field of single cells, in particular to a single cell packaging structure and a preparation method thereof. Background A fuel cell is a power generation device that directly converts chemical energy present in fuel and oxidant into electrical energy. The fuel cell has the advantages of zero emission, no vibration noise, good load response, high reliability and the like. Fuel cells can be generally classified into alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, proton exchange membrane fuel cells and the like, wherein the proton exchange membrane fuel cells have high energy conversion efficiency, can be rapidly started at room temperature, have no electrolytic water loss, have long service lives, are rapidly developed in recent years, and are increasingly valued. In fuel cells, the packaging sealing properties of the individual cells directly affect their operating efficiency and service life. The traditional packaging technology mostly adopts integral sealing or single glue layer sealing, and has the problems of uneven sealing, easy pollution of an active area by the glue layer, insufficient working condition resistance and the like. For example, the integral packaging is easy to overflow glue, so that the active area of the membrane electrode is covered, the electrochemical reaction efficiency is reduced, and the single glue layer is easy to age and lose efficacy under the extreme working conditions of high temperature, strong acid and the like, so that the reaction medium is leaked. Disclosure of Invention The first technical problem to be solved by the invention is to provide a single cell packaging structure which has good sealing effect and is not easy to leak reaction medium aiming at the defects existing in the prior art. In order to solve the technical problems, the technical scheme of the invention is as follows: The utility model provides a single cell packaging structure, includes the membrane electrode, the membrane electrode includes proton exchange membrane and is located the catalyst layer of proton exchange membrane both sides, one side the catalyst layer bonds with the hot melt adhesive layer of single face glue frame, the opposite side the catalyst layer overlap joint is on the double faced adhesive tape frame, the hot melt adhesive layer of single face glue frame bonds beyond the part behind the catalyst layer with the double faced adhesive tape frame bonds, the upper and lower both sides of double faced hot melt adhesive tape frame are equipped with the polar plate respectively, membrane electrode and two be equipped with the gas diffusion layer between the polar plate. Preferably, the single-sided adhesive frame is prepared by taking polyphenylene sulfide as a base material, coating a hot melt adhesive I on one side, and removing an active area through die cutting, wherein the hot melt adhesive I consists of acid modified polyolefin resin, epoxidized polybutadiene resin, isocyanate curing agent and diluent in a weight ratio of 100:5-10:0.5-3:50-100, and the diluent is a mixed solution of dimethylbenzene and ethyl acetate. Preferably, the preparation method of the single-sided adhesive frame comprises the following steps: S01, preparation of hot melt adhesive Mixing acid modified polyolefin resin, epoxidized polybutadiene resin, isocyanate curing agent and diluent according to a proportion, stirring for 20-40 min at normal temperature and 500-1000 r/min, and uniformly mixing to obtain hot melt adhesive; S02, preparation of single-sided adhesive frame Filtering the hot melt adhesive solution prepared in the step S01, coating the hot melt adhesive solution on a polyphenylene sulfide substrate by a scraper coater or a CED coater, drying the hot melt adhesive solution completely, attaching a release film, rolling and curing the release film, and obtaining the single-sided adhesive frame after curing. Preferably, the double-sided adhesive frame is prepared by taking polyphenyl ether or polyphenylene sulfide as a base material, coating hot melt adhesive II on two sides, and removing an active area through die cutting, wherein the hot melt adhesive II consists of high-melting-point polyolefin resin, an epoxidized thermoplastic elastomer, a modifier and an antioxidant in a weight ratio of 100:10-30:0.5-5:0.5-3. Preferably, the high-melting-point polyolefin resin is prepared by grafting maleic anhydride or derivatives thereof on the polyolefin resin, and the melting point of the high-melting-point polyolefin is 140-165 ℃. Preferably, the epoxidized thermoplastic elastomer is an epoxidized thermoplastic elastomer. Preferably, the modifier is an epoxy acrylic polymer. Preferably, the antioxidant is one or two mixtures of hindered phenols or aromatic amines. Preferably, the preparation method of the double-sided adhesive frame com