CN216250801U

CN216250801U - Preparation device for locally-reinforced fuel cell gas diffusion layer

Info

Publication number: CN216250801U
Application number: CN202122570800.5U
Authority: CN
Inventors: 林瑞; 刘鑫; 陈亮
Original assignee: Shanghai Yuanzhao New Energy Technology Co ltd
Current assignee: Shanghai Yuanzhao New Energy Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-08
Anticipated expiration: 2031-10-25

Abstract

The utility model discloses a preparation device of a locally-reinforced fuel cell gas diffusion layer, which comprises a precursor solution, the gas diffusion layer, an environment bin, an upper heating plate and a lower heating plate, wherein symmetrical hollow patterns are arranged in the upper heating plate and the lower heating plate, and the gas diffusion layer is horizontally clamped between the upper heating plate and the lower heating plate; the temperature of the upper heating plate and the lower heating plate is controlled at 100 ℃; atomizing the precursor solution with the reinforced structure, and then uniformly spraying the atomized precursor solution on the surface of the upper heating plate, so that dry powder of the precursor solution is deposited in a limited area of the gas diffusion layer; and then the dry powder of the precursor solution is tightly pressed on the gas diffusion layer through the airflow. The utility model adopts the upper heating plate and the lower heating plate which contain hollow patterns, and the gas diffusion layer is exposed only at the position needing to be reinforced, thereby flexibly carrying out local reinforcement, improving the mechanical strength, the electrical conductivity, the thermal conductivity and the hydrophilicity and the hydrophobicity are adjustable.

Description

Preparation device for locally-reinforced fuel cell gas diffusion layer

Technical Field

The utility model belongs to the technical field of fuel cells, and particularly relates to a preparation device of a locally-reinforced fuel cell gas diffusion layer.

Background

In recent years, proton exchange membrane fuel cells have been widely noticed by energy industries at home and abroad and automobile enterprises due to their advantages of cleanliness and high efficiency. As an important component of a fuel cell, a gas diffusion layer is generally composed of a porous material having good electrical conductivity. The fuel cell plays a variety of roles in gas transmission distribution, electron conduction, supporting of a catalytic layer, improvement of water management and the like during the operation of the fuel cell, and is a key component influencing the electrochemical performance of the fuel cell.

Generally, the gas diffusion layer is composed of a substrate layer and a microporous layer. The substrate layer is the main body framework of the gas diffusion layer, plays the roles of supporting the microporous layer and stabilizing the membrane electrode structure, and mainly comprises carbon fiber paper, carbon fiber cloth and graphite paper. Different raw materials have a variety of different pore structures, but generally have a porosity of about 70%. The microporous layer is implemented by adding pore-forming agent into the slurry formula and fixing the microporous layer on the substrate layer by adopting methods such as spraying, printing and the like, and the microporous layer is mainly used for improving the pore structure of the substrate layer so as to generate a pore structure smaller than that of the substrate layer. Meanwhile, the contact resistance between the substrate layer and the catalyst layer is reduced, so that reaction gas is quickly and uniformly distributed on the surface of the catalyst layer through the diffusion layer to react, and generated water is discharged in time, so that the catalyst layer is prevented from being flooded by water.

The control of the thickness of the gas diffusion layer is critical because it not only serves to transport and uniformly distribute reactant gases and product water, but also serves to stabilize the catalytic layer structure and conduct generated electricity and heat to the bipolar plate. By adding a reinforcing structure to the thin gas diffusion layer, the performance can be improved without affecting the mechanical strength. In the existing gas diffusion layer strengthening scheme, the whole gas diffusion layer is mostly immersed in a solution containing a strengthening phase, and the strengthening phase and the solution are mutually fused through drying and sintering processes. The method can lead to the strengthening phase to be distributed at each position of the diffusion layer, so that the original ventilation pore channel is blocked, which is not beneficial to the rapid mass transfer of the fuel cell.

SUMMERY OF THE UTILITY MODEL

The utility model provides a preparation device of a locally reinforced fuel cell gas diffusion layer to overcome the defects of the prior art.

The purpose of the utility model is realized by the following technical scheme: a preparation device of a locally-reinforced gas diffusion layer of a fuel cell comprises a precursor solution 1, a gas diffusion layer 3, an environment bin 5, an upper heating plate 2 and a lower heating plate 4, wherein symmetrical hollowed-out patterns are arranged in the upper heating plate 2 and the lower heating plate 4, and the gas diffusion layer 3 is horizontally clamped between the upper heating plate 2 and the lower heating plate 4; the temperature of the upper heating plate 2 and the lower heating plate 4 is controlled at 100 ℃; atomizing the precursor solution 1 with the reinforced structure, and then uniformly spraying the atomized precursor solution onto the surface of the upper heating plate 2, so that dry powder of the precursor solution 1 is deposited in a limited area of the gas diffusion layer 3; and applying negative pressure on the lower heating plate 4 to promote the gas flow to penetrate the gas diffusion layer 3 from the upper heating plate 2 and then to be discharged from the lower heating plate 4, so that the dry powder of the precursor solution 1 is tightly pressed on the gas diffusion layer 3.

The symmetrical hollowed-out patterns are in a shape of # and are not limited to the shape of # or are arranged in a fine net shape or other irregular patterns, so that the shape of the reinforced structure is one of net shape, silk shape, sheet shape and fusion shape.

Compared with the prior art, the utility model has the characteristics and beneficial effects that:

(1) the present invention uses the upper heating plate 2 and the lower heating plate 4 having the hollow pattern, and exposes the gas diffusion layer, such as the under-ridge region of the flow channel, and the gas inlet and outlet regions, only at the position to be reinforced, thereby flexibly performing the local reinforcement. Leaving more zones of high gas permeability for efficient gas transport.

(2) The utility model adopts a dry strengthening scheme, and the precursor solution of the strengthening phase is atomized, and a heating plate is used for heating the gas diffusion layer. The atomized solution is dried quickly when contacting the surface of the gas diffusion layer, and the disordered diffusion of the strengthening phase in the diffusion layer is avoided.

Drawings

FIG. 1 is a schematic diagram of an apparatus for preparing a locally enhanced gas diffusion layer for a fuel cell;

FIG. 2 is a photograph of a partially hydrophilic region of a gas diffusion layer of a partially reinforced fuel cell;

wherein: 1-precursor solution; 2-upper heating plate; 3-a gas diffusion layer; 4-lower side heating plate; 5-an environment bin; 6-hydrophilic region.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments.

As shown in fig. 1, a device for preparing a locally reinforced gas diffusion layer of a fuel cell comprises a precursor solution 1, a gas diffusion layer 3, an environmental chamber 5, an upper heating plate 2 and a lower heating plate 4, wherein symmetrical hollow patterns are arranged in the upper heating plate 2 and the lower heating plate 4, and the gas diffusion layer 3 is horizontally sandwiched between the upper heating plate 2 and the lower heating plate 4; the temperature of the upper heating plate 2 and the lower heating plate 4 is controlled at 100 ℃; atomizing the precursor solution 1 with the reinforced structure, and then uniformly spraying the atomized precursor solution onto the surface of the upper heating plate 2, so that dry powder of the precursor solution 1 is deposited in a limited area of the gas diffusion layer 3; and applying negative pressure on the lower heating plate 4 to promote the gas flow to penetrate the gas diffusion layer 3 from the upper heating plate 2 and then to be discharged from the lower heating plate 4, so that the dry powder of the precursor solution 1 is tightly pressed on the gas diffusion layer 3.

The negative pressure, the heating control of the upper heating plate 2 and the lower heating plate 4, which are referred to in the present embodiment, are achieved by a spray auxiliary device in the related art, and thus are not shown in the drawings.

The working principle of the preparation device of the locally strengthened gas diffusion layer of the fuel cell is as follows:

s1: horizontally sandwiching the gas diffusion layer 3 between the upper heating plate 2 and the lower heating plate 4; the temperature of the upper heating plate 2 and the lower heating plate 4 is controlled at 100 ℃;

s2: atomizing the precursor solution 1 with the reinforced structure, and then uniformly spraying the atomized precursor solution onto the surface of the upper heating plate 2, so that dry powder of the precursor solution 1 is deposited in a limited area of the gas diffusion layer 3, wherein the deposition amount can be realized by controlling the atomizing particle size and the spraying time;

s3: applying negative pressure of-0.05 MPa or-0.1 MPa to the lower heating plate 4 in the environment bin 5 at 300-350 ℃ to promote the air flow to penetrate through the gas diffusion layer 3 from the upper heating plate 2 and then to be discharged to the lower heating plate 4, wherein the negative pressure application time is 1 hour or 2 hours;

s4: after the environmental chamber 5 is cooled to room temperature, the locally strengthened gas diffusion layer of the fuel cell can be obtained, as shown in fig. 2, which is a physical photograph of the hydrophilic region 6 after being locally strengthened.

The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The preparation device of the locally-reinforced gas diffusion layer of the fuel cell comprises a precursor solution (1), the gas diffusion layer (3) and an environmental chamber (5), and is characterized by further comprising an upper heating plate (2) and a lower heating plate (4), wherein symmetrical hollowed-out patterns are arranged in the upper heating plate (2) and the lower heating plate (4), and the gas diffusion layer (3) is horizontally clamped between the upper heating plate (2) and the lower heating plate (4); the temperatures of the upper heating plate (2) and the lower heating plate (4) are controlled to be 100 ℃; atomizing the precursor solution (1) with the reinforced structure, and then uniformly spraying the atomized precursor solution onto the surface of the upper heating plate (2) to deposit dry powder of the precursor solution (1) in a limited area of the gas diffusion layer (3); and then the dry powder of the precursor solution (1) is pressed on the gas diffusion layer (3) through gas flow.

2. The apparatus for preparing a locally enhanced gas diffusion layer for a fuel cell according to claim 1, wherein the symmetric cut-out pattern is in the shape of "#".