Search

CN-122025668-A - Preparation method of membrane electrode and single-side frame membrane electrode

CN122025668ACN 122025668 ACN122025668 ACN 122025668ACN-122025668-A

Abstract

The invention provides a preparation method of a membrane electrode and a single-frame membrane electrode, wherein the preparation method of the membrane electrode is used for preparing the membrane electrode with a single frame and comprises the steps of cutting a frame membrane with a hollowed-out middle reaction area; removing part of the protective film on one side of the frame film along the edge of the middle reaction zone and exposing part of the adhesive film, overlapping CCM on the adhesive film and pre-attaching the CCM on the frame film, and hot-pressing the pre-attached CCM and the frame film to obtain the membrane electrode. The preparation method of the membrane electrode can reduce the types of materials, simplify the working procedures and improve the preparation efficiency, and meanwhile, can avoid adhesion and pollution of other parts of adhesive films, tools and the like, thereby being beneficial to improving the sealing effect. Moreover, the hot pressing process can enable the adhesion between the CCM and the frame membrane to be more compact and uniform, reduce possible tiny gaps between the CCM and the frame membrane, and reduce the occurrence probability of problems such as gas leakage.

Inventors

  • XU YANZHAO
  • ZHONG FEI

Assignees

  • 未势能源科技有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. A method for preparing a membrane electrode, for preparing a membrane electrode with a single frame, comprising the steps of: Cutting a frame film (1) with a hollowed-out middle reaction zone (K); Removing part of the protective film (103) on one side of the frame film (1) along the edge of the intermediate reaction zone (K) and exposing part of the adhesive film (102); lapping CCM (2) on the adhesive film (102) and pre-attaching the CCM on the frame film (1); And (3) performing hot pressing on the CCM (2) and the frame membrane (1) which are pre-attached together to obtain the membrane electrode.
  2. 2. The method for producing a membrane electrode according to claim 1, wherein, After the CCM (2) is lapped on the adhesive film (102), the CCM is pre-attached on the frame film (1) through a hot pressing mechanism (2); And (3) carrying out hot pressing on the CCM (2) and the frame membrane (1) which are pre-attached together through a hot press to obtain the membrane electrode.
  3. 3. The method for preparing a membrane electrode according to claim 2, wherein after the CCM (2) is lapped on the adhesive film (102), the CCM is pre-laminated on the frame film (1) through a hot pressing mechanism (2), comprising: And (2) overlapping the CCM (2) on the adhesive film (102), heating the overlapping part of the CCM (2) and the frame film (1) through the hot pressing mechanism, applying the pressure of a first preset pressure, and pre-attaching the CCM (2) on the frame film (1).
  4. 4. The method for preparing a membrane electrode according to claim 2, wherein the pre-bonding of the CCM (2) and the frame membrane (1) together is performed by hot pressing by a hot press to obtain the membrane electrode, comprising: Positioning the CCM (2) and the frame membrane (1) pre-attached together on a lower plate (4) of the hot press; And controlling the upper plate (3) of the hot press to perform hot pressing on the CCM (2) and the frame membrane (1) for a preset time at a first preset temperature under a second preset pressure, so as to obtain the membrane electrode.
  5. 5. The method according to claim 4, wherein when the upper plate (3) of the thermo-compression machine is controlled to thermo-compress the CCM (2) and the frame membrane (1) at a first preset temperature for a preset time at a second preset pressure, the method further comprises: Controlling the lower plate (4) of the hot press to heat the CCM (2) and the frame membrane (1) at a second preset temperature so as to perform temperature compensation on the CCM (2) and the frame membrane (1); Wherein the second preset temperature is less than the first preset temperature.
  6. 6. The method for producing a membrane electrode according to claim 2, wherein: The upper plate (3) and the lower plate (4) of the hot press are respectively provided with an annular heating part (N), and the heating parts (N) on the upper plate (3) and the lower plate (4) are respectively arranged corresponding to the adhesive films (102) exposed on the frame films (1).
  7. 7. The method for producing a membrane electrode according to claim 2, wherein: And a cooling unit which is arranged corresponding to the intermediate reaction zone (K) on the frame film (1) is arranged on the upper plate (3) of the hot press.
  8. 8. The method for producing a membrane electrode according to claim 2, wherein: In the lower plate (4) of the hot press, at least the part corresponding to the middle reaction zone (K) on the frame film (1) is made of microporous ceramic materials, and the rest parts are provided with a plurality of vacuum adsorption holes.
  9. 9. The method for producing a membrane electrode according to any one of claims 2 to 8, characterized in that: the hot pressing mechanism comprises a bearing plate, a pressing plate with a heating part, and a driving part for driving the pressing plate to lift and/or, And polytetrafluoroethylene coatings are sprayed on opposite sides of the upper plate (3) of the hot press and the lower plate (4) of the hot press.
  10. 10. The unilateral frame membrane electrode is characterized in that: Comprises a frame mould (1) and a CCM (2) arranged on one side of the frame mould (1); the frame mold (1) comprises a frame base material (101), adhesive films (102) positioned on two sides of the frame base material (101), and protective films (103) positioned on the outer sides of the adhesive films (102) on all sides, wherein the CCM (2) is adhered to the frame base material (101) through the adhesive films (102) on one side.

Description

Preparation method of membrane electrode and single-side frame membrane electrode Technical Field The invention relates to the technical field of fuel cell manufacturing, in particular to a preparation method of a membrane electrode, and simultaneously relates to a single-side frame membrane electrode. Background The fuel cell is used as a power generation device, can convert chemical energy in fuel into electric energy through chemical reaction, and has the remarkable advantages of high power density, high conversion rate, low environmental pollution and the like. Membrane Electrodes (MEA) serve as the key components of the fuel cell, which are the core sites for the electrochemical reaction of the fuel cell. The membrane electrode of the single-layer frame mainly comprises a CCM (Catalyst Coated Membrane, catalyst coated proton exchange membrane), a cathode and anode gas diffusion layer and frame membranes which are positioned at two sides and play a supporting role. And, CCM then contains proton membrane, and sets up the negative and positive electrode catalyst in proton membrane both sides. And the CCM packaging process is to package the CCM and the frame membrane supported on one side together, so as to form the MEA. Currently, CCM packages mainly have three bonding modes, roll-to-roll, roll-to-sheet, and sheet-to-sheet. The roll-to-roll and roll-to-sheet bonding methods are suitable for large-scale mass production, and the sheet-to-sheet bonding methods are more suitable for the conditions of research and development stages and small-scale production. When the piece-to-piece bonding mode is adopted, in the CCM packaging process, firstly, a single-layer frame die (the structure of the CCM is a base material such as PEN in the middle, and adhesive films are respectively arranged on two sides of the single-layer frame die) is cut into pieces, and meanwhile, a middle reaction area is hollowed out. Then, the solution was placed on a horizontal stage. And then, performing silk-screen UV glue (namely ultraviolet curing glue) treatment on the edge of the cut CCM, and then, attaching the CCM to the cut frame, and curing the CCM by the UV glue to realize the preset position. Finally, the membrane electrode after the pre-pressing positioning is transferred into a hot-pressing cavity, and hot-pressing forming operation is carried out at the position. However, in the packaging process, the UV glue is used for pre-positioning, and sealing is realized by the glue film. However, since the sealing is completed by using both of these adhesive materials at the same time, the adhesive interface increases, which certainly increases the risk of leakage, resulting in poor sealing effect. In addition, the two processes of UV glue dispensing and photo-curing are additionally added in the mode, so that the material cost and the process cost are high. In addition, the adhesive film is in an exposed state and can be directly contacted with the tool in the laminating hot-pressing process. Once the adhesive is adhered to the tool, the subsequent sealing between the tool and the polar plate is adversely affected. Disclosure of Invention In view of the above, the present invention aims to provide a method for preparing a membrane electrode, so as to reduce the procedures and improve the sealing effect. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: a method for preparing a membrane electrode using a single frame, the method comprising: cutting a frame film with a hollowed-out middle reaction area; removing part of the protective film on one side of the frame film along the edge of the intermediate reaction zone, and exposing part of the adhesive film; lapping CCM on the adhesive film and pre-laminating on the frame film; and hot-pressing the CCM and the frame membrane which are pre-attached together to obtain the membrane electrode. Further, after the CCM is lapped on the adhesive film, the CCM is pre-attached on the frame film through a hot pressing mechanism; And after the CCM and the frame membrane which are pre-attached together are subjected to hot pressing through a hot press, the membrane electrode is obtained. Further, after the CCM is lapped on the adhesive film, the CCM is pre-laminated on the frame film through a hot pressing mechanism, and the method comprises the following steps: And (3) lapping the CCM on the adhesive film, heating the lapping part of the CCM and the frame mold by the hot pressing mechanism, applying the pressure of a first preset pressure, and pre-laminating the CCM on the frame film. Further, after the pre-attached CCM (2) and the frame membrane (1) are hot pressed by a hot press, the membrane electrode is obtained, and the method comprises the following steps: Positioning the CCM and the frame membrane which are pre-attached together on a lower plate of a hot press; And controlling the upper plate of the hot press to carry out hot pressing on the