CN113013439A

Movatterモバイル変換

Info

Publication number: CN113013439A
Application number: CN202110172917.XA
Authority: CN
Inventors: 郑闻达; 曹惠荣; 李少尉
Original assignee: Shanghai Chuxin Industrial Co ltd
Current assignee: Shanghai Chuxin Industrial Co ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-06-22

Abstract

The invention discloses a PEM fuel cell core component MEA edge sealing process in the technical field of PEM fuel cells, which comprises the following steps: (1) fixing the sealing ring on an operation platform, and uniformly spraying pressure-sensitive adhesive at the specified position of the sealing ring, wherein the spraying pressure is 550-650KPa, and the coating thickness is 0.025-0.035mm to obtain a processing sealing ring; (2) flatly fixing the MEA on the transparent plate, and pressing the surface of the processing sealing ring with the pressure sensitive adhesive with the MEA; (3) cutting the processed sealing ring and the MEA after pressing to the specified size; according to the invention, the pressure-sensitive adhesive is added, the pressure-sensitive adhesive is uniformly sprayed on one surface of the sealing ring, and then the sealing ring and the MEA are pressed together without adopting a traditional hot pressing method, so that the sealing ring can be pressed together at room temperature, the sealing ring is directly bonded with the MEA, the harm caused by the traditional hot pressing method is avoided, and the service life of the battery is prolonged.

Description

MEA edge sealing process for core component of PEM fuel cell

Technical Field

The invention relates to the technical field of PEM fuel cells, in particular to a PEM fuel cell core component MEA edge sealing process.

Background

The Membrane Electrode (MEA) is the core component of a fuel cell, and is composed of a Gas Diffusion Layer (GDL), a catalyst layer (catalyst layer-CL) and a Proton Exchange Membrane (PEM). The Catalyst Coated Membrane (CCM) is made from PEM, cathode and anode Catalyst Layers (CL) by a certain process flow. The edge sealing process has a significant impact on the service life and premature failure of the MEA. The MEA edge sealing ring has the following effects that 1) the PEM is very soft in texture, the size is very easily influenced by temperature and relative humidity, the edge sealing ring can play a role in supporting stable size, 2) the toughness of the material of the edge sealing ring is far greater than that of the PEM, the sealing load can be increased without damaging the PEM, 3) the MEA is made of different materials, the thermal expansion coefficients of the materials of all layers are different, stress can be generated between the layers, the edge sealing ring can avoid the occurrence of the condition, 4) the area of an MEA activation region can be effectively controlled by the edge sealing ring, the consistency of each unit cell is kept, 5) the edge sealing ring has good gas barrier property, and the permeation of reaction gas can be effectively prevented.

The conventional MEA edge sealing process is a hot press method. The hot pressing method is to bond the seal ring and the MEA by a hot pressing method. Disadvantages arise due to the heating temperature exceeding the glass transition point of the PEM, 1) thinning of the PEM at the portion coinciding with the seal ring during pressurization, and 2) thermal stresses resulting from heating/cooling, which can lead to micro-cracks at the junction with the PEM at the inner side of the seal ring, leading to premature cell failure.

A PEM fuel cell core MEA edge sealing process is therefore proposed to solve the above problems.

Disclosure of Invention

The invention aims to provide a process for sealing the edge of an MEA (membrane electrode assembly) of a core component of a PEM (proton exchange membrane) fuel cell, which solves the problems in the prior art.

In order to achieve the purpose, the invention provides a process for sealing the edge of an MEA (membrane electrode assembly) of a core component of a PEM (proton exchange membrane) fuel cell, which comprises the following steps:

(1) fixing the sealing ring on an operation platform, and uniformly spraying pressure-sensitive adhesive at the specified position of the sealing ring, wherein the spraying pressure is 550-650KPa, and the coating thickness is 0.025-0.035mm to obtain a processing sealing ring;

(2) flatly fixing the MEA on the transparent plate, and pressing the surface of the processing sealing ring with the pressure sensitive adhesive with the MEA;

(3) and cutting the pressed processing sealing ring and the pressed MEA to the specified size.

Preferably, in the step (1), the pressure-sensitive adhesive is any one of silicon-based and acrylic resin

Preferably, in the step (1), the material of the seal ring is any one of polyethylene terephthalate and polyethylene naphthalate.

Preferably, in step (1), the deviation between the coating position and the designated position is less than 0.01 mm.

Preferably, in step (1), the spraying power source is compressed air, and the compressed air provides power for shaping air pressure, atomizing air pressure and flow pressure through a triple solenoid valve.

Preferably, the shaping air pressure is controlled to be 200-300KPa, the atomizing air pressure is controlled to be 250-350KPa, and the flow pressure is controlled to be 150-250 KPa.

Preferably, in the step (1), the pressure-sensitive adhesive is stored in a storage tank, and the storage tank is provided with an upper limit sensor, a lower limit sensor, an automatic stirring device and a vacuumizing device.

Preferably, the stirring speed of the automatic stirring device is 500-600r/min, and the vacuum degree in the storage tank is kept within 100 Pa.

The invention has the beneficial effects that:

according to the invention, the pressure-sensitive adhesive is added, the pressure-sensitive adhesive is uniformly sprayed on one surface of the sealing ring, and then the sealing ring and the MEA are pressed together without adopting a traditional hot pressing method, so that the sealing ring can be pressed together at room temperature, the sealing ring is directly bonded with the MEA, the harm caused by the traditional hot pressing method is avoided, and the service life of the battery is prolonged;

the pressure-sensitive adhesive is uniformly sprayed on the sealing ring by a spraying mode, wherein the thickness of the coating is 0.03 +/-0.005 mm, the deviation of the position of the coating is not more than 0.01mm, the obtained coating is uniform and very thin, and the surplus pressure-sensitive adhesive is effectively prevented from overflowing to an activation area of the MEA during pressing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a simplified block diagram of a PEM fuel cell;

FIG. 2 is a schematic view of the process flow of the MEA and the gasket of the present invention;

FIG. 3 is a cutting diagram of the MEA and the sealing ring of the present invention after being pressed together.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A process for sealing the edge of MEA (membrane electrode assembly) of core component of PEM fuel cell specifically comprises the following steps:

(1) fixing the sealing ring on an operation platform, and uniformly spraying pressure-sensitive adhesive on the specified position of the sealing ring, wherein the spraying pressure is 600KPa, the thickness of the coating is 0.025mm, and the deviation between the coating position and the specified position is less than 0.01mm to obtain a processing sealing ring;

The pressure-sensitive adhesive is in acrylic resin; the sealing ring is made of polyethylene naphthalate; the spraying power source is compressed air, and the compressed air provides power for shaping air pressure, atomizing air pressure and flow pressure through a triple electromagnetic valve; the shaping air pressure was controlled at 300KPa, the atomizing air pressure at 300KPa, and the flow rate pressure at 200 KPa.

The pressure-sensitive adhesive is stored in a storage tank, and the storage tank is provided with an upper limit sensor, a lower limit sensor, an automatic stirring device and a vacuumizing device; the stirring speed of the automatic stirring device was 500r/min, and the vacuum degree in the storage tank was maintained at 100 Pa.

Example 2

(1) fixing the sealing ring on an operation platform, and uniformly spraying pressure-sensitive adhesive on the specified position of the sealing ring, wherein the spraying pressure is 600KPa, the thickness of the coating is 0.03mm, and the deviation between the coating position and the specified position is less than 0.01mm to obtain a processing sealing ring;

The pressure-sensitive adhesive is in acrylic resin; the sealing ring is made of polyethylene naphthalate; the spraying power source is compressed air, and the compressed air provides power for shaping air pressure, atomizing air pressure and flow pressure through a triple electromagnetic valve; the shaping air pressure was controlled at 250KPa, the atomizing air pressure at 300KPa, and the flow rate pressure at 200 KPa.

Example 3

The pressure-sensitive adhesive is stored in a storage tank, and the storage tank is provided with an upper limit sensor, a lower limit sensor, an automatic stirring device and a vacuumizing device; the stirring speed of the automatic stirring device was 550r/min, and the vacuum degree in the storage tank was maintained at 100 Pa.

Example 4

(1) fixing the sealing ring on an operation platform, uniformly spraying pressure-sensitive adhesive on the specified position of the sealing ring, wherein the spraying pressure is 600KPa, the thickness of the coating is 0.035mm, and the deviation between the coating position and the specified position is less than 0.01mm, so as to obtain a processing sealing ring;

The pressure-sensitive adhesive is in acrylic resin; the sealing ring is made of polyethylene naphthalate; the spraying power source is compressed air, and the compressed air provides power for shaping air pressure, atomizing air pressure and flow pressure through a triple electromagnetic valve; the shaping air pressure was controlled at 250KPa, the atomizing air pressure was controlled at 300KPa, and the flow rate pressure was controlled at 250 KPa.

Example 5

The pressure-sensitive adhesive is stored in a storage tank, and the storage tank is provided with an upper limit sensor, a lower limit sensor, an automatic stirring device and a vacuumizing device; the stirring speed of the automatic stirring device was 600r/min, and the vacuum degree in the storage tank was maintained at 100 Pa.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not exhaustive. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A process for sealing the MEA edge of a core component of a PEM fuel cell, comprising the steps of:

2. The process of claim 1, wherein in step (1), the pressure sensitive adhesive is any one of silicon-based and acrylic resin.

3. The process of claim 1, wherein in step (1), the sealing ring is made of one of polyethylene terephthalate and polyethylene naphthalate.

4. The process of claim 1, wherein in step (1), the deviation between the coating position and the specified position is less than 0.01 mm.

5. The process of claim 1, wherein in step (1) the source of motive power is compressed air, which powers shaping air pressure, atomizing air pressure, and flow pressure via a triple solenoid valve.

6. The MEA edge sealing process of the PEM fuel cell core component according to claim 5, wherein the shaping air pressure is controlled to 200-300KPa, the atomization air pressure is controlled to 250-350KPa, and the flow pressure is controlled to 150-250 KPa.

7. The process of claim 1, wherein in step (1), the pressure sensitive adhesive is stored in a storage tank, and the storage tank is equipped with an upper limit sensor, a lower limit sensor, an automatic stirring device and a vacuum pumping device.

8. The MEA edge sealing process of PEM fuel cell core unit according to claim 7, wherein the stirring speed of the automatic stirring device is 500-600r/min, and the vacuum degree in the storage tank is maintained within 100 Pa.