Gas diffusion layer base material forming device for fuel cell and forming device

Abstract

The utility model provides a gas diffusion layer base material forming device for a fuel cell and a forming device. The forming device comprises a separation body, a bottom frame and a forming net, in the closed state, the bottom frame is arranged in the separation body; the forming net is arranged between the separating body and the bottom frame; the limiting bodies sequentially penetrate through the separating body, the forming net and the bottom frame; the forming device comprises a dehydration device and a forming cylinder, and further comprises a gas diffusion layer base material forming device for the fuel cell, in a closed state, the separating body, the underframe and the forming net are arranged at the bottom of the forming cylinder; according to the gas diffusion layer base material forming device for the fuel cell and the forming device, the forming net can be directly moved according to requirements, so that the moving difficulty is reduced; the wet paper sheets can be separated from the forming net according to needs, due to the fact that the forming net is not limited by the separating body and the bottom frame, the angle of the forming net can be changed more flexibly, the net disengaging difficulty is lowered, and the problems that the wet paper sheets wrinkle in the net disengaging process and the like are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a gas diffusion layer substrate forming device for fuel cells. Background Art

[0002] With the development of hydrogen energy, proton exchange membrane fuel cells (PEMFCs) offer high power and energy density, making them one of the most promising power devices for future transportation and space exploration. The gas diffusion layer (GDL) plays a crucial role in fuel cells, performing important functions such as mass transfer, electrical conductivity, water management, and thermal management. It is one of the three core building blocks of hydrogen fuel cells. Laboratory research on the preparation of GDL substrates is essential, and how to quickly and easily prepare a complete GDL substrate is a key issue.

[0003] The gas diffusion layer (GDL) consists of a support layer and a microporous layer. The support layer is mostly made of hydrophobically treated porous carbon fiber paper (carbon paper) or carbon fiber cloth (carbon cloth); the microporous layer is typically composed of conductive carbon black and a hydrophobic agent. The GDL substrate, the base layer of the fuel cell GDL, is typically a paper-like material made by wet-forming carbon fibers with a binder. Because the graphite layers on the carbon fiber surface are tightly and orderly arranged, aligning with the fiber orientation, the graphite crystallites are large and largely defect-free, resulting in a smooth, functional-group-free surface and inertness. This makes the carbon fiber difficult to wet with water and difficult to separate and polish through pulping, as is the case with plant fibers. This characteristic of carbon fiber results in a wet sheet of paper formed after dispersion, homogenization, and dehydration, lacking hydrogen bonding between fibers, resulting in low paper strength. Furthermore, GDL substrates for fuel cell applications require a low grammage and thin thickness. Improper de-screening can easily lead to wrinkles and uneven paper formation, impacting the substrate's paper-forming and performance.

[0004] In existing technology, a gas diffusion layer substrate former is a laboratory device used to prepare and shape carbon fiber slurry and rapidly vacuum dry it. This requires a metal or stainless steel mesh secured between a stainless steel frame. The primary function of the former is to retain the slurry as much as possible on the mesh, removing as much water as possible and forming a uniform wet paper web. As the slurry is dehydrated on the forming mesh, fibers and non-fiber additives in the slurry gradually deposit on the mesh. Therefore, the slurry must be evenly dispersed on the mesh to ensure uniform basis weight, thickness, and uniformity across the entire width of the substrate.

[0005] In addition, when the existing technology is used to prepare the gas diffusion layer substrate, the standard deflocculent carbon fiber slurry is homogenized and then quickly filtered to form the slurry. The obtained wet paper sheet is attached to the metal forming net. Then, a piece of absorbent paper or transfer cloth is placed on the wet paper sheet, and then the absorbent paper or absorbent felt is placed. The felt roller is rolled back and forth 2-3 times, and the absorbent paper or felt is removed. The paper sheet and the first layer of absorbent paper or absorbent cloth are transferred down for drying.

[0006] In the existing technology, the stainless steel mesh is fixed to the stainless steel frame with screws and cannot be removed. For the gas diffusion layer substrate, the substrate can only be transferred manually, which is manpower-consuming. In addition, the effect of substrate removal from the mesh varies from person to person and requires a certain level of technical content. It will also cause the substrate wet paper sheet to have wrinkles and uneven paper forming after being removed from the mesh, thereby affecting the paper forming performance and performance of the gas diffusion layer. Utility Model Content

[0007] The purpose of the utility model is to provide a fuel cell gas diffusion layer substrate molding device and molding machine, the fuel cell gas diffusion layer substrate molding device and molding machine can solve the above technical problems;

[0008] The utility model provides a gas diffusion layer substrate forming device for a fuel cell, comprising:

[0009] separator, chassis and forming screen;

[0010] In the closed state, the base frame is placed in the separator; and the forming wire is placed between the separator and the base frame;

[0011] A plurality of limiting bodies pass through the separating body, the forming net and the bottom frame in sequence.

[0012] As a further technical solution, a groove is provided on the separation body; in the closed state, the base frame is placed in the groove.

[0013] As a further technical solution, it also includes: a first sealing ring, which is arranged in the groove; in the closed state, the first sealing ring is placed on one side of the base frame.

[0014] As a further technical solution, it also includes: a second sealing ring, which is arranged in the groove; in the closed state, the second sealing ring is placed on the other side of the base frame.

[0015] As a further technical solution, a plurality of first through holes are provided on the separation body, and a plurality of second through holes are provided on the base frame; in the closed state, the first through holes correspond to the second through holes.

[0016] As a further technical solution, a plurality of limiting bodies are respectively disposed in the plurality of first through holes and the plurality of second through holes.

[0017] As a further technical solution, the number of the first through holes is not less than 3; the number of the second through holes is not less than 3.

[0018] Preferably, the separation body is a hollow structure, and the base frame is a hollow structure.

[0019] As a further technical solution, the length and width of the base frame are equal, and the length and width are 300-400 mm; the length and width of the separation body are equal, and the length and width are 310-410 mm.

[0020] The utility model also proposes a former, comprising a dehydrating device and a forming cylinder, and also comprising a gas diffusion layer substrate forming device for a fuel cell; in a closed state, the separator, the base frame and the forming net are placed at the bottom of the forming cylinder.

[0021] The technical solution of the utility model has a simple structure. The forming net is fixed by the cooperation of the separation body and the base frame. After the forming net is fixed, slurry is applied on the forming net, and then the wet paper sheets are attached to the forming net after operations such as suction filtration and forming. After subsequent water absorption and drying operations, the plurality of limiting bodies are separated from the separation body and the base frame. Then, the base frame is separated from the separation body to obtain the forming net with the wet paper sheets attached thereto. In this way, the forming net can be directly moved as needed, reducing the difficulty of movement. The wet paper sheets can also be separated from the forming net as needed. Since there is no restriction of the separation body and the base frame, the forming net can change its angle more flexibly, reducing the difficulty of de-netting and effectively avoiding problems such as wrinkles on the wet paper sheets during the de-netting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a gas diffusion layer substrate forming device for a fuel cell according to the present invention;

[0024] Figure 2 This is a three-dimensional diagram of a gas diffusion layer substrate forming device for a fuel cell according to the present invention;

[0025] Figure 3 It is a three-dimensional diagram of the separation body in the utility model;

[0026] Figure 4 This is a three-dimensional diagram of the bottom frame of the utility model;

[0027] Figure 5This is a schematic structural diagram of another embodiment of a gas diffusion layer substrate forming device for a fuel cell according to the present invention;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure of the X part in the middle;

[0029] Figure 7 This is an enlarged schematic diagram of the structure of the lock assembly in the utility model;

[0030] Figure 8 for Figure 7 A stereogram at one angle;

[0031] Figure 9 for Figure 7 Cross-sectional view of the AA section;

[0032] Figure 10 A three-dimensional diagram of the mounting body of the present invention at one angle;

[0033] Figure 11 This is a three-dimensional diagram of the installation body of the present invention from another angle;

[0034] Figure 12 A three-dimensional diagram of the lock body of the present invention at one angle;

[0035] Figure 13 This is a schematic diagram of the installation state of the lock assembly and the base frame of the utility model;

[0036] Figure 14 This is a schematic diagram of the mounting structure of the lock assembly and the chassis in the present invention from another angle;

[0037] Figure 15 It is a structural diagram of the former in the utility model.

[0038] Description of reference numerals:

[0039] 1-separating body; 2-base frame; 21-positioning groove; 22-limiting plate; 3-forming net; 4-limiting body; 5-groove; 6-first through hole; 7-second through hole; 8-locking group; 811-housing; 812-mounting groove; 813-mounting hole; 814-first limiting plate; 815-second limiting plate; 816-first spring column; 817-slideway; 821-locking piece; 822-slider; 823-locking tongue; 824-second spring column; 825-sliding block; 91-dehydrating device; 92-forming cylinder. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0043] like Figure 1-4 As shown, the utility model proposes a fuel cell gas diffusion layer substrate forming device, comprising:

[0044] Separator 1, base frame 2 and forming net 3; under normal circumstances, the separator 1, base frame 2 and forming net 3 are in a separated state; when needed, the forming net 3 is placed on the base frame 2, and the forming net 3 is manually tightened. After the separator 1 is connected to the base frame 2, the base frame 2 is placed in the separator 1; specifically, in a closed state, the base frame 2 is placed in the separator 1; and the forming net 3 is placed between the separator 1 and the base frame 2; the forming net 3 is fixed by the cooperation of the base frame 2 and the separator 1; in addition, a number of limiting bodies 4 pass through the separator 1, the forming net 3 and the base frame 2 in sequence; a number of limiting bodies 4 are installed in the separator 1 to prevent the base frame 2 and the forming net 3 from moving in the separator 1.

[0045] like Figure 3 and Figure 4 As shown, a groove 5 is provided on the separation body 1; in the closed state, the base frame 2 is placed in the groove 5; in the utility model, the size of the groove 5 is adapted to the size of the base frame 2, and it is also necessary to ensure that the forming net 3 can be placed in the groove 5 after being fixed; of course, in order to increase the tension of the forming net 3, a first sealing ring (not shown in the figure) is also provided, and the first sealing ring is arranged in the groove 5; in the closed state, the first sealing ring is placed on one side of the base frame 2; in order to further increase the tension, a second sealing ring (not shown in the figure) is also provided, and the second sealing ring is arranged in the groove 5; in the closed state, the second sealing ring is placed on the other side of the base frame 2; because both the first sealing ring and the second sealing ring are elastic, it can be ensured that a certain tension exists when operating the forming net 3, thereby avoiding damage to the forming net 3 during operation; at the same time, after closing, several limiting bodies 4, the separation body 1, the forming net 3 and the base frame 2 further fix the forming net to avoid low tension of the forming net during subsequent dehydration.

[0046] In addition, a plurality of first through holes 6 are provided on the separation body 1, and a plurality of second through holes 7 are provided on the base frame 2; in the closed state, the first through holes 6 and the second through holes 7 correspond to each other; a plurality of limiting bodies 4 are respectively passed through the plurality of first through holes 6 and the plurality of second through holes 7; specifically, after the limiting bodies 4 pass through the first through holes 6 and the second through holes 7 in sequence, the positions of the base frame 2, the forming net 3 and the separation body 1 are restricted, so as to prevent the base frame 2 and the forming net 3 from moving in the separation body 1; in the present utility model, the number of the first through holes 6 is not less than 3; the number of the second through holes 7 is not less than 3; the base frame 2 is further prevented from moving in the separation body 1 by fixing at least three points; preferably, 4 first through holes 6, 4 second through holes 7 and 4 limiting bodies 4 are provided; and the limiting bodies 4 are preferably bolts;

[0047] It should be noted that the first sealing ring and the second sealing ring are arranged in the groove 5, and the first sealing ring and the second sealing ring are fixed to one side or both sides of the inner wall of the groove 5 by waterproof glue. After the dehydration is completed, the separation body 1 is opened to separate the base frame 2; the forming net 3 is removed for subsequent drying; the sealing ring can further prevent the forming net 3 from moving between the separation body 1 and the base frame 2.

[0048] like Figure 1-4As shown, the separator 1 is a hollow structure and the base frame 2 is a hollow structure; when the forming net 3 is limited by the separator 1 and the base frame 2, the operating area of ​​the forming net 3 is not blocked, so that the slurry coating operation can be better performed; in addition, in the present invention, the length and width of the base frame 2 are equal, and the length and width are 300-400mm; the length and width of the separator 1 are equal, and the length and width are 310-410mm; wherein, the length and width of the periphery of the base frame 2 are both 360mm; the width of the frame is 10mm; the length and width of the periphery of the separator 1 are 370mm, the width of the frame is 20mm, and the width of the groove 5 is 10mm; of course, the dimensions of the base frame 2 and the separator 1 can be adjusted according to actual needs, and the present invention does not further limit this.

[0049] like Figure 5-14 As shown, in another embodiment of the present invention, a plurality of lock groups 8 are further provided on the base frame 2. When the network needs to be disconnected, the lock group 8 is operated to form an operating arm, and the separation efficiency of the base frame 2 and the separation body 1 can be improved by operating the operating arm. Specifically, the lock group 8 includes a mounting body and a lock body. The mounting body is arranged in the positioning groove 21 on the base frame 2; Figure 13 As shown, the lock assembly 8 is in a closed state, with the lock body in contact with the limit plate 22 to limit the position of the lock assembly 8; when it is needed, the lock body is operated to separate the lock body from the limit plate 22, and the mounting body is driven by the lock body to rotate simultaneously, adjusting the angle in the positioning groove 21, so that the mounting body and the lock body form an operating arm for subsequent operations;

[0050] like Figure 7-12 As shown, the mounting body includes a shell 811, a mounting groove 812, a mounting hole 813, a first limiting plate 814, a second limiting plate 815, a first spring column 816 and a slide 817; the mounting groove 812 and the mounting hole 813 are respectively provided on the shell 811; and are connected to the base frame 2 after passing through the mounting hole 813 by a rotating shaft, and the rotating shaft serves as the axis when the shell 811 rotates; the first limiting plate 814 is provided at one end of the shell 811, and the second limiting plate 815 is provided at the other end of the shell 811. In the present utility model, the second limiting plate 815 can be connected to the shell 811 after passing through the second limiting plate 815 by a bolt; in addition, a movable opening is provided on the first limiting plate 814; one end of the lock body is passed through the movable opening and can move in the movable opening; the first spring column 816 is provided on the second limiting plate 815; the slide 817 is provided on both sides of the inner wall of the shell 811;

[0051] The lock body includes a lock piece 821, a slider 822, a lock tongue 823, a second spring post 824 and a toggle block 825; the slider 822 is relatively arranged on both sides of the lock piece 821; the lock tongue 823 is arranged at one end of the lock piece 821, and the second spring post 824 is arranged at the other end of the lock piece 821; the toggle block 825 is arranged on the lock piece 821; when assembled with the mounting body, the sliders 822 are respectively placed in the slideways 817 on both sides of the shell 811, the lock tongue 823 is inserted into the movable opening on the first limiting plate 814; the toggle block 825 is placed in the mounting groove 812; the second spring post 824 is arranged opposite to the first spring post 816; in the present utility model, two first spring posts 816 are provided on the second limiting plate 815, and two second spring posts 824 are provided at the other end of the lock piece 821, and a spring is provided between the first spring post 816 and the second spring post 824; due to the presence of the spring, the lock tongue 823 is always in a state of extending out of the first limiting plate 814;

[0052] In actual use, when the chassis 2 needs to be separated from the separation body 1, the toggle block 825 is operated, and the lock member 821 and the lock tongue 823 at one end of the lock member 821 are driven by the toggle block 825; the slider 822 moves laterally in the slideway 817, and the lock tongue 823 is separated from the limit plate 22; when the toggle block 825 is operated, the second spring column 824 moves toward the position of the first spring column 816, and compresses the spring between the first spring column 816 and the second spring column 824; the lock tongue 823 and the limit plate are in a closed position. After the housing 811 is separated from the locking plate 22, the toggle block 825 is lifted up to rotate the housing 811 around the shaft. At this time, the toggle block 825 is released, and the lock tongue 823 is reset under the action of the spring. At this time, even if the housing 811 or the toggle block 825 is released, the lock tongue 823 will be stuck on the top of the limit plate 22 and will not enter the positioning groove 21. If the lock tongue 823 needs to enter the positioning groove 21, the toggle block 825 needs to be pressed down, and the lock tongue 823 will push the lock element 821 to move, and then the lock tongue 823 will slide into the lower side of the limit plate 22.

[0053] In the present invention, the number of lock groups 8 is set according to needs, and preferably four lock groups 8 are set in the present invention; in addition, when operating the lock group 8, it is necessary to ensure that the temperature of the base frame 2 is lowered to a temperature that will not burn the human body, or to wear heat-insulating gloves for operation; the present invention does not further limit this.

[0054] The present invention also proposes a former, including a dehydration device and a forming cylinder, and also includes a gas diffusion layer substrate forming device for fuel cells; in a closed state, the separator 1, the base frame 2 and the forming net 3 are placed at the bottom of the forming cylinder; specifically, after the forming net 3 is restricted by the base frame 2 and the separator 1, and the slurry coating operation is completed on the forming net 3, the base frame 2, the separator 1 and the forming net 3 are placed at the bottom of the forming cylinder for subsequent dehydration and other operations; after the dehydration and other operations are completed, the base frame 2, the separator 1 and the forming net 3 are taken out, the forming net 3 is separated from the base frame 2 and the separator 1, and the forming net 3 is transferred or de-netted as needed; it should be noted that, in the present invention, the dehydration device and the forming cylinder both adopt the existing technology, and the present invention does not further limit this.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas diffusion layer substrate molding device for a fuel cell, characterized in that: include: Separating body (1), base frame (2) and forming net (3); In a closed state, the base frame (2) is placed inside the separation body (1); and the forming net (3) is placed between the separation body (1) and the base frame (2); A plurality of limiting bodies (4) pass through the separation body (1), the forming net (3) and the bottom frame (2) in sequence.

2. The fuel cell gas diffusion layer substrate molding device according to claim 1, characterized in that: The separation body (1) is provided with a groove (5); in a closed state, the base frame (2) is placed in the groove (5).

3. The fuel cell gas diffusion layer substrate molding device according to claim 2, characterized in that: Also includes: A first sealing ring is arranged in the groove (5); in a closed state, the first sealing ring is placed on one side of the base frame (2).

4. The fuel cell gas diffusion layer substrate molding device according to claim 2 or 3, characterized in that: Also includes: The second sealing ring is arranged in the groove (5); in a closed state, the second sealing ring is placed on the other side of the base frame (2).

5. The fuel cell gas diffusion layer substrate molding device according to claim 1, characterized in that: The separation body (1) is provided with a plurality of first through holes (6), and the base frame (2) is provided with a plurality of second through holes (7); in a closed state, the first through holes (6) and the second through holes (7) correspond to each other.

6. The fuel cell gas diffusion layer substrate molding device according to claim 5, characterized in that: The plurality of limiting bodies (4) are respectively arranged in the plurality of first through holes (6) and the plurality of second through holes (7).

7. The fuel cell gas diffusion layer substrate molding device according to claim 6, characterized in that: The number of the first through holes (6) is not less than 3; the number of the second through holes (7) is not less than 3.

8. The fuel cell gas diffusion layer substrate molding device according to claim 1, characterized in that: The separation body (1) is a hollow structure, and the base frame (2) is a hollow structure.

9. The fuel cell gas diffusion layer substrate molding device according to claim 7, characterized in that: The length and width of the base frame (2) are equal, and the length and width are between 300-400 mm; the length and width of the separation body (1) are equal, and the length and width are between 310-410 mm.

10. A gas diffusion layer substrate forming device for a fuel cell, comprising a dehydration device and a forming cylinder, characterized in that It also includes a gas diffusion layer substrate forming device for a fuel cell according to any one of claims 1 to 9; in a closed state, the separator (1), the base frame (2) and the forming net (3) are placed at the bottom of the forming cylinder.

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