A cover plate for CCM spraying

Abstract

The utility model relates to fuel cell field, concretely is a kind of cover plate for CCM spraying.The cover body and protective sleeve, the cover body is equipped with at least two positioning holes, at least two positioning holes are connected with the positioning pin sleeve of placing seat, the cover body is equipped with square groove and forms spraying area between proton exchange membrane, spraying equipment is located above the cover body so that spraying area forms spraying layer, the cover body both sides are equipped with holding part, the protective sleeve can be detachably buckled on the holding part, increase holding area, it is convenient to make the cover body vertically lift up.Avoid the problem that CCM layer is damaged if uneven force is used or the angle is not perpendicular when taking out the cover body, improve CCM layer stability.

Description

Technical Field

[0001] This utility model relates to the field of fuel cells, specifically a cover plate for CCM spraying. Background Technology

[0002] The CCM, or composite membrane electrode, is one of the core components of a hydrogen fuel cell, mainly composed of three parts: a proton exchange membrane, a catalyst layer, and a gas diffusion layer. The catalyst layer (anode and cathode) plays a crucial role in accelerating the electrochemical reaction; therefore, its quality directly affects the power density, efficiency, and lifespan of the fuel cell. The catalyst layer is typically formed by atomizing and depositing a catalyst slurry onto the surface of the proton exchange membrane using a spraying method, creating a catalyst layer with specific structure and properties. This catalyst layer, together with the proton exchange membrane, forms the CCM. The gas diffusion layer is then hot-pressed onto both sides of the CCM to form the membrane electrode.

[0003] The surface of the gas diffusion layer (GDL) of a fuel cell is typically etched with flow fields (such as serpentine or parallel channels), and only the areas covered by these channels require the catalyst layer to participate in the electrochemical reaction. If the entire surface is sprayed, the catalyst in non-flow field areas (such as below the ridges of the flow field) cannot come into contact with the reactant gases, forming an "ineffective coating." Therefore, when spraying catalyst slurry onto the surface of the proton exchange membrane, only certain areas need to be sprayed, while the non-sprayed areas need to be covered and isolated by a cover plate.

[0004] Currently, the CCM spraying process mainly consists of a placement base, spraying equipment, and a proton exchange membrane. During spraying, the proton exchange membrane is usually placed in the placement base, and then Teflon cloth is adhered to the bottom of a stainless steel cover plate. The stainless steel cover plate is then inserted into the positioning pin of the placement plate for covering, forming a placement base-proton exchange membrane-Teflon cloth-cover plate. To eliminate deformation and wrinkles of the Teflon cloth and proton exchange membrane, a vacuum adsorption and heating process is required for the cover plate. When removing the cover plate after spraying, due to the negative pressure adsorption between the Teflon cloth and the proton exchange membrane, the process is also careful and slow to ensure uniform separation between the Teflon cloth and the proton exchange membrane. However, because the contact area between the cover plate and the worker's palm is small, there is a risk of hand injury, which affects the worker's application of force and can easily lead to uneven force or non-perpendicular removal angle, resulting in damage to the catalyst layer. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a cover plate for CCM spraying.

[0006] The objective of this utility model can be achieved through the following technical solutions: A cover plate for CCM spraying includes a cover body and a protective sleeve. The cover body has at least two positioning holes, which are engaged with positioning pins of a placement seat. The cover body (1) has a square groove that forms a spraying area between itself and the proton exchange membrane. The spraying equipment is located above the cover body (1) so that the spraying area forms a spraying layer. The cover body has gripping parts on both sides. The protective sleeve is detachably fastened to the gripping parts to increase the gripping area and facilitate the vertical lifting of the cover body.

[0007] Preferably, the grip portion is irregularly arched, and the short side located above the grip portion is the handle area.

[0008] Preferably, the protective sleeve has a hollow structure that encloses the grip area of ​​the holding part.

[0009] Preferably, the bottom of the protective sleeve matches the irregular arched structure of the grip portion.

[0010] Preferably, the protective sleeve has a cut at the top to facilitate fastening and disassembly.

[0011] Preferably, it also includes an adhesive component, which is disposed at the edge of the spraying area and makes the edge of the spraying area flat by gravity.

[0012] Preferably, the fitting component includes a groove and a positioning block, and the cover body has a plurality of grooves near the edge of the square groove, with the positioning block placed in the groove.

[0013] Preferably, there are four grooves, evenly arranged on the four sides of the square groove of the cover body.

[0014] The beneficial effects of this utility model are as follows: The irregular arched design of the grip section maintains the bending strength of the short side and makes the grip area more suitable for the hand, providing an anti-slip effect. It also prevents slight displacement of the cover body along the grip section when the Teflon cloth is attached to the proton exchange membrane. The four grip sections are symmetrical in pairs, and with the guidance of the positioning holes, the grip posture of the operator is more correct when holding the cover, avoiding the problem of tilting and lifting. It also makes it easier for the operator to lift the cover, improving the stability when removing the cover body. At the same time, the overall contact and separation of the Teflon cloth and the proton exchange membrane are more synchronized during lifting and lowering, avoiding uneven stress on the proton exchange membrane and affecting the CCM layer in the spraying area. In addition, the gravity of the positioning block makes the edge of the square groove of the cover body fit the proton exchange membrane more closely, overcoming the influence of airflow on the edge of the directional groove, resulting in a smoother edge in the spraying area. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1This is a schematic diagram of the overall design of this utility model.

[0017] Figure 2 This is a schematic diagram showing the disassembled parts of this utility model.

[0018] Figure 3 This is a schematic diagram showing the disassembled protective sleeve of this utility model. Legend: 1. Cover body; 2. Positioning hole; 3. Groove; 4. Positioning block; 5. Grip part; 6. Protective cover. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] like Figures 1-3 As shown, a cover plate for CCM spraying includes a concave cover body 1. The cover body 1 is 370mm long and 345mm wide. The left and right ends are bent perpendicular to the plane of the cover body 1 to form short sides. The short sides are 40mm high and 345mm long. The cover body 1 is made entirely of stainless steel sheet, forming a stainless steel bent part. Stainless steel has a certain strength and is not easily bent. Furthermore, the bottom is flatter than plastic parts. The one-piece bending process ensures that there are no weld points on the surface of the cover body 1, avoiding the problems of insufficient surface flatness and uneven heating that weld points can cause with welding methods. The short sides are bent perpendicular to the plane of the cover body 1 to form short sides. The edges between the bodies 1 are transitioned by a curved surface to prevent the proton exchange membrane from fusing to the bottom of the cover body 1 after heating. Positioning holes 2 are symmetrically formed diagonally on the cover body 1, and these holes engage with positioning pins on the external placement base. The proton exchange membrane is positioned on the placement base, ensuring that the cover body 1 is always placed in the same position. This also prevents the cover body 1 from moving and scratching the CMM surface coating due to gas impact during spraying, thus solving the problem of coating misalignment caused by positioning deviation of the cover body 1. A layer of high-temperature resistant Teflon cloth is adhered to the bottom of the cover body 1 using high-temperature resistant gold fingers. The size of the Teflon cloth is the same as the opening size of the cover body 1. To coat the proton exchange membrane with catalyst slurry, a square groove is formed in the center of the concave surface of the cover body 1. This groove and the proton exchange membrane form a coating area. During coating, the coating equipment (such as a spray gun) atomizes the catalyst slurry with compressed air. When the high-speed airflow impacts the edge of the cover body 1, local dynamic pressure is formed at the bottom edge of the square groove. According to Bernoulli's principle, the higher the airflow velocity, the lower the static pressure in this area, which may generate a pressure difference opposite to the direction of vacuum adsorption, pushing the edge of the cover body 1 upward. At the same time, the Teflon cloth is soft and easily deformed under the impact of the airflow. When the airflow seeps in from the gaps at the edge of the cover body 1, it forms an "air cushion layer" between the Teflon cloth and the proton exchange membrane, further lifting the cover body 1 and widening the gaps. This results in uneven adhesion between the proton exchange membrane, Teflon cloth, and cover body 1 at the edge of the coating area, affecting the coating effect.

[0021] In this embodiment, a groove 3 is provided at a distance of 15mm from the edge of the square groove on the cover body 1. The groove 3 is arranged in four evenly arrayed on the four sides of the square groove of the cover body 1. The four grooves 3 are used to place the heavier positioning block 4. The gravity of the positioning block 4 makes the edge of the square groove of the cover body 1 fit the proton exchange membrane more closely, overcomes the influence of airflow on the edge of the directional groove, and makes the edge of the spraying area smoother.

[0022] To eliminate deformation and wrinkles in the proton exchange membrane and Teflon cloth, the cover body 1 is vacuum-adsorbed and heated. Heating is achieved by external heating elements, which raise the temperature of the cover body 1. Through heat conduction, the Teflon cloth and proton exchange membrane also heat up. Heating helps to improve the bonding strength between the CCM layer and the proton exchange membrane in the spraying area and accelerates the molding process. When the cover body 1 needs to be removed after the spraying equipment has finished spraying, there is a certain negative pressure due to the tight adhesion with the proton exchange membrane. When removing the cover body 1 by external force, this negative pressure must be broken first. If the force is uneven or the removal angle is tilted when breaking through this negative pressure, the removal direction of the cover body 1 will not be perpendicular, causing the cover body 1 to come into contact with the sprayed CCM layer and causing scratches on the CCM layer.

[0023] Therefore, to facilitate quick and easy removal of the cover body 1 while ensuring coating quality and improving work efficiency, this embodiment provides two gripping parts 5 on each of the short sides of the cover body 1. This avoids situations where the cover body 1 is too far from the workstation to reach the short sides. The short side above the gripping parts 5 is the handle area. Each gripping part 5 is 100*25mm. The gripping parts 5 are used to grip the cover body 1. The two gripping parts 5 on the same side are spaced 40mm apart and 5mm from the top of the short side. The gripping parts 5 are irregularly arched. Compared to a planar structure, the irregular arched design of the gripping parts 5 can maintain the bending strength of the short side. This design makes the grip area more comfortable for the hand, providing a non-slip grip and preventing slight displacement of the cover body 1 along the grip portion 5 when the Teflon cloth is attached to the proton exchange membrane. The four grip portions 5 are symmetrical in pairs, and with the guidance of the positioning holes 2, the grip posture of the operator is more correct when holding the cover in the grip area, avoiding the problem of tilting and lifting. It also makes it easier for the operator to lift the cover, improving the stability of the cover body 1 when it is removed. At the same time, the overall contact and separation of the Teflon cloth and the proton exchange membrane are more synchronized during lifting and lowering, avoiding uneven stress on the proton exchange membrane, which would affect the CCM layer in the spraying area.

[0024] Because the external heating element heats the cover body 1, heat conduction causes the grip area of ​​the handle 5 to also become hot. Therefore, excessive heat can easily burn the operator when gripping the cover. Even if the heat is not high, and the contact between the hand and the grip area is within an acceptable range, the negative pressure adsorption between the Teflon cloth and the proton exchange membrane necessitates careful and slow removal of the cover body 1 to ensure even detachment. As time passes, the temperature of the cover body 1 transferred to the hand increases, causing discomfort to the operator and prompting them to speed up the removal of the cover body 1. This can also affect the CCM layer in the sprayed area. When the cover body 1 is thin and light, the grip area is also thin and light, which can cause discomfort and pressure on the hand when gripping the grip area. Therefore, this embodiment proposes a protective sleeve 6. The protective sleeve 6 is fitted onto the short side of the cover body 1 and wraps around the grip area. The protective sleeve 6 has a hollow structure. The lower part of the protective sleeve 6 fits the irregular arched structure of the grip area. The upper part of the protective sleeve 6 is broken to form an isolation strip. The protective sleeve 6 can be made of plastic or silicone. The plastic part is made of deformable material and has a certain heat insulation performance, so that the upper part of the protective sleeve 6 can be disassembled and replaced to wrap around the grip area. The silicone part is made of rubber and has a better heat insulation effect. The grip area can be peeled off from the upper part of the silicone part.

[0025] Working principle: When the CCM layer needs to be sprayed onto the proton exchange membrane, first cover the bottom of the cover body 1 with a high-temperature resistant Teflon cloth of the corresponding size, and place the proton exchange membrane on the placement seat. The diagonal positioning holes 2 of the cover body 1 are inserted into the positioning pins of the placement seat and vacuum adsorption is performed. The heating element is activated, and the cover body 1 falls down, causing the Teflon cloth to adhere to the proton exchange membrane. The square groove of the cover body 1 forms the spraying area, and the rest of the cover body 1 is a shielding area to block the catalyst slurry sprayed by the spraying equipment. The slurry is sprayed by an external spraying equipment. After the spraying is completed, a protective cover 6 is put on the handle area of ​​the cover body 1 so that the operator can hold it with heat insulation and it fits the finger curve for a more stable grip and easier application of force.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A cover plate for CCM spray, characterized by, The device includes a cover body (1) and a protective sleeve (6). The cover body (1) has at least two positioning holes (2), which are engaged with the positioning pins of the placement seat. The cover body (1) has a square groove that forms a spraying area between itself and the proton exchange membrane. The spraying equipment is located above the cover body (1) so that the spraying area forms a spraying layer. The cover body (1) has gripping parts (5) on both sides. The protective sleeve (6) can be detachably fastened to the gripping parts (5) to increase the gripping area and facilitate the vertical lifting of the cover body (1).

2. The cover plate for CCM spraying according to claim 1, characterized in that: The grip portion (5) is irregularly arched, and the short side above the grip portion (5) is the handle area.

3. A cover plate for CCM spraying according to claim 1, characterized in that: The protective sleeve (6) has a hollow structure and wraps around the grip area of ​​the grip part (5).

4. A cover plate for CCM spraying according to claim 1, characterized in that: The bottom of the protective sleeve (6) matches the irregular arched structure of the grip (5).

5. A cover plate for CCM spraying according to claim 1, characterized in that: The protective sleeve (6) has a cut at the top for easy fastening and disassembly.

6. A cover plate for CCM spraying according to claim 1, characterized in that: It also includes grooves (3) and positioning blocks (4). The cover body (1) has several grooves (3) near the edge of the square groove, and the positioning blocks (4) are placed in the grooves (3).

7. A cover plate for CCM spraying according to claim 6, characterized in that: There are four grooves (3), which are evenly arranged on the four sides of the square groove of the cover body (1).

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