Overlapping parts and overlapping methods based on substrates

Abstract

The present invention discloses a substrate-based overlapping member and overlapping method. The overlapping member comprises: a first substrate, a second substrate, a slurry layer, a first adhesive tape layer, and / or a second adhesive tape layer. The slurry layer includes slurry evenly distributed between a first overlapping region of the first substrate and a second overlapping region of the second substrate. The adhesive tape layer is used to bond the non-overlapping and overlapping regions of the two substrates. The adhesive tape layer is resistant to a first temperature. After drying at the first temperature, the slurry can bond the first overlapping region of the first substrate and the second overlapping region of the second substrate together, and the slurry layer is resistant to a second temperature higher than the first temperature. In this way, the present invention can provide technical support for avoiding production interruptions and improving the qualification rate and efficiency of GDL coating production.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a substrate-based overlapping member and a substrate-based overlapping method. Background Art

[0002] In today's coating industry, every time a coating is completed and a new substrate is used, tape or glue is needed to splice it.

[0003] The coating process for fuel cell gas diffusion layers (GDLs) requires temperatures exceeding 300°C. Existing soft adhesives on the market, such as so-called high-temperature-resistant tape adhesives, essentially lose their adhesive properties at temperatures above 300°C. Carbonization also causes the tape to break, disrupting production and reducing both the pass rate and efficiency of GDL coating. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide an overlapping part based on a substrate and an overlapping method based on a substrate, which can provide technical support for avoiding production interruption and improving the qualification rate and efficiency of GDL coating production.

[0005] To solve the above technical problems, the present invention adopts a technical solution: providing a substrate-based overlapping part, comprising: a first substrate, comprising an adjacent first overlapping area and a first non-overlapping area; a second substrate, comprising an adjacent second overlapping area and a second non-overlapping area, the second overlapping area corresponding to the first overlapping area and overlapping each other; a slurry layer, the slurry layer comprising a slurry uniformly distributed between the first overlapping area and the second overlapping area, the slurry layer being capable of bonding the first overlapping area and the second overlapping area together; a first adhesive tape layer, arranged on the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate, the first adhesive tape layer being used to bond the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate; and / or a second adhesive tape layer, arranged on the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate, the second adhesive tape layer being used to bond the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate; wherein the first adhesive tape layer and / or the second adhesive tape layer can withstand a first temperature, and the slurry of the slurry layer can bond the first overlapping area and the second overlapping area together after drying at the first temperature, and enable the slurry layer to withstand a second temperature, the second temperature being greater than the first temperature.

[0006] The length of the overlapping portion between the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate is 40-60 mm; the widths of the first substrate and the second substrate are both 300-500 mm; and the length of the first tape layer and / or the second tape layer is less than the width of the first substrate and the second substrate, and is greater than or equal to 0.95 times the width of the first substrate and the second substrate.

[0007] Wherein, the first substrate and the second substrate are both carbon fiber substrates.

[0008] The components of the slurry include graphite, carboxymethyl cellulose and polyvinyl pyrrolidone; wherein the content of the graphite is in the range of 5-15 parts by mass, the content of the carboxymethyl cellulose is in the range of 1-3 parts by mass, and the content of the polyvinyl pyrrolidone is in the range of 5-10 parts by mass; the slurry also includes water, and the content of the water is in the range of 70-88 parts by mass.

[0009] Wherein, the first substrate and the second substrate are both fuel cell gas diffusion layer substrates; wherein, the first temperature is 100 degrees, and the second temperature is 200-400 degrees; wherein, the first tape layer and / or the second tape layer is aluminum foil tape.

[0010] To solve the above technical problems, another technical solution adopted by the present invention is: providing a substrate-based overlapping method, including: step 1: providing a first substrate and a second substrate, the first substrate including adjacent first overlapping areas and first non-overlapping areas, and the second substrate including adjacent second overlapping areas and second non-overlapping areas; step 2: arranging the first substrate and the second substrate relative to each other so that the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate overlap with each other, uniformly coating slurry between the first overlapping area and the second overlapping area to form a slurry layer, bonding tape on the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate to form a first tape layer, and / or bonding tape on the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate to form a second tape layer; wherein, the first tape layer and / or the second tape layer can withstand a first temperature, and the slurry of the slurry layer can bond the first overlapping area and the second overlapping area together after drying at the first temperature, and enable the slurry layer to withstand a second temperature, and the second temperature is greater than the first temperature.

[0011] The length of the overlapping portion between the first overlapping region of the first substrate and the second overlapping region of the second substrate is 40-60 mm; the widths of the first substrate and the second substrate are both 300-500 mm; the length of the first tape layer and / or the second tape layer is less than the width of the first substrate and the second substrate, and greater than or equal to 0.95 times the width of the first substrate and the second substrate; and the first substrate and the second substrate are both carbon fiber substrates.

[0012] The components of the slurry include graphite, carboxymethyl cellulose and polyvinyl pyrrolidone; wherein the content of the graphite is in the range of 5-15 parts by mass, the content of the carboxymethyl cellulose is in the range of 1-3 parts by mass, and the content of the polyvinyl pyrrolidone is in the range of 5-10 parts by mass; the slurry also includes water, and the content of the water is in the range of 70-88 parts by mass.

[0013] Wherein, the first substrate and the second substrate are both fuel cell gas diffusion layer substrates; wherein, the first temperature is 100 degrees, and the second temperature is 200-400 degrees; wherein, the first tape layer and / or the second tape layer is aluminum foil tape.

[0014] Among them, step 2 specifically includes: arranging the first substrate and the second substrate relative to each other so that the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate overlap with each other; bonding the tape on the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate to form a first tape layer; after evenly applying the slurry on the first overlapping area of ​​the first substrate, placing and adhering the second overlapping area of ​​the second substrate to the first overlapping area of ​​the first substrate; bonding the tape on the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate to form a second tape layer.

[0015] The beneficial effects of the present invention are as follows: Unlike the prior art, the slurry layer in the substrate overlapping structure of the present invention includes slurry evenly distributed between the first overlapping region of the first substrate and the second overlapping region of the second substrate. The tape layer is used to bond the non-overlapping and overlapping regions of the two substrates. The tape layer can withstand a first temperature. After drying at the first temperature, the slurry can bond the first overlapping region of the first substrate and the second overlapping region of the second substrate together, and the slurry layer can withstand a second temperature higher than the first temperature. This overlapping structure allows the first and second substrates to be connected by the tape layer at temperatures below the first temperature. After drying at the first temperature, the tape layer loses its adhesiveness, and the slurry layer serves to bond the first overlapping region of the first substrate and the second overlapping region of the second substrate together. The slurry layer can withstand a second temperature higher than the first temperature. In this way, technical support can be provided for avoiding production interruptions and improving the qualification rate and efficiency of GDL coating production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0017] Figure 1 2. It is a schematic structural diagram of an embodiment of a first substrate and a second substrate in a substrate-based overlapping member of the present invention;

[0018] Figure 2 is based on Figure 1 A schematic structural diagram of an embodiment of an overlapping member of a substrate;

[0019] Figure 3 1 is a schematic flow chart of an embodiment of the substrate-based overlapping method of the present invention;

[0020] Figure 4 It is a schematic flow chart of another embodiment of the substrate-based overlapping method of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] See also Figure 1 and Figure 2 , Figure 1 1 is a schematic structural diagram of an embodiment of a first substrate and a second substrate in a substrate-based overlapping member of the present invention. Figure 2 is based on Figure 1 A schematic structural diagram of an embodiment of overlapping parts of a substrate.

[0023] The overlapping member includes: a first substrate 1, a second substrate 2, a slurry layer 3, a first adhesive tape layer 4, and / or a second adhesive tape layer 5. That is, the overlapping member may have three structures: the first structure includes the first substrate 1, the second substrate 2, the slurry layer 3, and the first adhesive tape layer 4; the second structure includes the first substrate 1, the second substrate 2, the slurry layer 3, and the second adhesive tape layer 5; the third structure includes the first substrate 1, the second substrate 2, the slurry layer 3, the first adhesive tape layer 4, and the second adhesive tape layer 5 (e.g., Figure 2 shown).

[0024] The first substrate 1 includes adjacent first overlapping areas 11 and first non-overlapping areas 12 ; the second substrate 2 includes adjacent second overlapping areas 21 and second non-overlapping areas 22 . The second overlapping areas 21 correspond to the first overlapping areas 11 and overlap with each other.

[0025] It should be noted that, in this embodiment, the shapes and materials of the first substrate 1 and the second substrate 2 are not limited and can be any of the existing shapes and materials. Generally, the shape of the substrate used more often is rectangular (e.g. Figure 1 The sizes of the first overlapping area 11 and the second overlapping area 21 are not limited and are determined according to specific practical applications.

[0026] The slurry layer 3 includes a slurry uniformly distributed between the first overlapping area 11 and the second overlapping area 21, and the slurry layer 3 can bond the first overlapping area 11 and the second overlapping area 21 together. The slurry of the slurry layer 3 is not limited, as long as it can bond the first overlapping area 11 and the second overlapping area 21 together after drying at a first temperature, and the slurry layer 3 can withstand a second temperature (for example, a high temperature of 200-400 degrees), which is greater than the first temperature. Generally, the components of the slurry can be selected according to the material composition of the first substrate 1 and the second substrate 2. For example, the components of the slurry can be the same as or similar to the material composition of the first substrate 1 and the second substrate 2. In this way, the slurry layer 3 can more easily bond the first overlapping area 11 and the second overlapping area 21 together.

[0027] The first adhesive tape layer 4 is disposed on the first overlapping region 11 of the first substrate 1 and the second non-overlapping region 22 of the second substrate 2 . The first adhesive tape layer 4 is used to bond the first overlapping region 11 of the first substrate 1 and the second non-overlapping region 22 of the second substrate 2 .

[0028] The second adhesive tape layer 5 is disposed on the first non-overlapping region 12 of the first substrate 1 and the second overlapping region 21 of the second substrate 2 . The second adhesive tape layer 5 is used to bond the first non-overlapping region 12 of the first substrate 1 and the second overlapping region 21 of the second substrate 2 .

[0029] The first tape layer 4 and / or the second tape layer 5 can withstand a first temperature. That is, when the temperature is less than or equal to the first temperature, the first substrate 1 and the second substrate 2 are mainly bonded by the first tape layer 4 and / or the second tape layer 5. When the viscosity of the first tape layer 4 or the second tape layer 5 is sufficient to bond the first substrate 1 and the second substrate 2, only one tape layer may be required. When the viscosity of the first tape layer 4 or the second tape layer 5 is not sufficient to bond the first substrate 1 and the second substrate 2 well, or in order to bond the first substrate 1 and the second substrate 2 more firmly, two tape layers (i.e., the first tape layer 4 and the second tape layer 5) may be included. The material of the first tape layer 4 and / or the second tape layer 5 is not limited, as long as it can withstand the first temperature.

[0030] The slurry layer 3 in the substrate overlapping structure of the embodiment of the present invention includes slurry evenly distributed between the first overlapping region 11 of the first substrate 1 and the second overlapping region 21 of the second substrate 2. The tape layer is used to bond the non-overlapping and overlapping regions of the two substrates. The tape layer is capable of withstanding a first temperature. After drying at the first temperature, the slurry can bond the first overlapping region 11 of the first substrate 1 and the second overlapping region 21 of the second substrate 2 together, and the slurry layer 3 can withstand a second temperature higher than the first temperature. This overlapping structure allows the first substrate 1 and the second substrate 2 to be joined by the tape layer at temperatures below the first temperature. After drying at the first temperature, the tape layer loses its adhesiveness, and the slurry layer 3 serves to bond the first overlapping region 11 of the first substrate 1 and the second overlapping region 21 of the second substrate 2 together. The slurry layer can withstand a second temperature higher than the first temperature. This method can provide technical support for avoiding production interruptions and improving the yield and efficiency of GDL coating production.

[0031] In one embodiment, the length of the overlapping portion between the first overlapping region 11 of the first substrate 1 and the second overlapping region 21 of the second substrate 2 is 40-60 mm, for example, 40 mm, 50 mm, 60 mm, and so on.

[0032] The widths of the first substrate 1 and the second substrate 2 are both 300-500 mm, for example, 300 mm, 400 mm, 500 mm, and so on.

[0033] Furthermore, the length of the first tape layer 4 and / or the second tape layer 5 is less than the width of the first substrate 1 and the second substrate 2, and is greater than or equal to 0.95 times the width of the first substrate 1 and the second substrate 2. For example, when the width of the first substrate 1 and the second substrate 2 is 300 mm, the length of the first tape layer 4 and / or the second tape layer 5 is greater than or equal to 285 mm; when the width of the first substrate 1 and the second substrate 2 is 400 mm, the length of the first tape layer 4 and / or the second tape layer 5 is greater than or equal to 380 mm; when the width of the first substrate 1 and the second substrate 2 is 500 mm, the length of the first tape layer 4 and / or the second tape layer 5 is greater than or equal to 475 mm, and so on.

[0034] In one embodiment, both the first substrate 1 and the second substrate 2 are carbon fiber substrates.

[0035] Carbon fiber is a new type of high-strength, high-modulus fiber material with a carbon content exceeding 95%. It is composed of organic fibers, such as flaky graphite crystals, stacked along the fiber's axial direction, and then treated with carbonization and graphitization to produce a microcrystalline graphite material. Carbon fiber is "soft on the outside and strong on the inside," lighter than aluminum but stronger than steel. It also features corrosion resistance, high modulus, ultra-high temperature resistance in non-oxidizing environments, excellent fatigue resistance, and specific heat and electrical conductivity between non-metallic and metal properties. It also exhibits a low and anisotropic thermal expansion coefficient, excellent X-ray transparency, and excellent electrical and thermal conductivity, as well as excellent electromagnetic shielding properties. It is a crucial material for both national defense and civilian applications, combining the inherent properties of carbon with the softness and workability of textile fibers, making it a new generation of reinforcing fibers.

[0036] At this time, components of the slurry may include graphite, carboxymethyl cellulose, and polyvinyl pyrrolidone.

[0037] In this embodiment, the slurry uses graphite that is consistent with the carbon fiber substrate material, carboxymethyl cellulose is used as a binder, and polyvinyl pyrrolidone is used as a thickener.

[0038] Wherein, calculated based on 100 parts by mass, the content of graphite ranges from 5 to 15 parts by mass, for example, 5 parts by mass, 10 parts by mass, 15 parts by mass, and so on; further, the content of graphite is within 10 parts by mass. If the graphite content is too low, the slurry viscosity will be too low. The content of carboxymethyl cellulose ranges from 1 to 3 parts by mass, for example, 1 part by mass, 2 parts by mass, 3 parts by mass, and so on; this will make the slurry viscosity moderate. The content of polyvinyl pyrrolidone ranges from 5 to 10 parts by mass, for example, 5 parts by mass, 7.5 parts by mass, 10 parts by mass, and so on; further, the content of polyvinyl pyrrolidone is within 8 parts by mass. The slurry also includes water, and the content of water ranges from 70 to 88 parts by mass, for example, 70 parts by mass, 80 parts by mass, 88 parts by mass, and so on. The water content is moderate. Too much water will make the slurry too thin, and too little water will make the slurry too thick.

[0039] In a practical application, a spiral mixer can be used to prepare the slurry. All materials are placed in a mixing barrel, and the slurry is continuously stirred and dispersed for 120 minutes at a dispersion speed of 2000 / min and a stirring speed of 30 / min. Finally, the slurry required for the practical application of splicing is prepared.

[0040] The first substrate 1 and the second substrate 2 are both fuel cell gas diffusion layer substrates. The first temperature is 100 degrees Celsius, the second temperature is 200-400 degrees Celsius, and the first tape layer 4 and / or the second tape layer 5 are aluminum foil tapes.

[0041] The fuel cell GDL coating process requires temperatures exceeding 300°C. Existing soft adhesives on the market, such as so-called high-temperature-resistant tape glues, essentially lose their adhesive properties at temperatures above 300°C. Carbonization also causes the tape to break, disrupting production and reducing the pass rate and efficiency of GDL coating.

[0042] In this embodiment, the overlapping pieces are bonded with aluminum foil high-temperature tape before being placed in a 100°C oven. After exceeding 100°C, the slurry firmly bonds the two substrates. Testing has shown that the overlapping pieces passed through the oven smoothly at 200°C, 300°C, and 350°C. Repeated testing has consistently shown that the overlapping pieces passed through the 350°C oven without any problems. This approach avoids production interruptions and improves both the pass rate and efficiency of GDL coating production.

[0043] See also Figure 3 , Figure 3 This is a schematic flow diagram of an embodiment of a substrate-based overlapping method of the present invention. This embodiment of the overlapping method can obtain the aforementioned substrate-based overlapping parts. For detailed descriptions of the relevant contents, please refer to the aforementioned substrate-based overlapping parts section and will not be repeated here. The method includes:

[0044] Step S1: providing a first substrate and a second substrate, wherein the first substrate includes adjacent first overlapping regions and first non-overlapping regions, and the second substrate includes adjacent second overlapping regions and second non-overlapping regions.

[0045] Step S2: The first substrate and the second substrate are arranged relative to each other so that the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate overlap with each other, the slurry is evenly coated between the first overlapping area and the second overlapping area to form a slurry layer, the tape is bonded on the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate to form a first tape layer, and / or, the tape is bonded on the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate to form a second tape layer.

[0046] Among them, the first tape layer and / or the second tape layer can withstand the first temperature, and the slurry of the slurry layer can bond the first overlapping area and the second overlapping area together after being dried at the first temperature, and make the slurry layer able to withstand the second temperature, which is greater than the first temperature.

[0047] The slurry layer in the substrate overlapping structure obtained in the embodiment of the present invention includes a slurry evenly distributed between the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate. The tape layer is used to bond the non-overlapping area and the overlapping area of ​​the two substrates. The tape layer can withstand a first temperature. After the slurry is dried at the first temperature, it can bond the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate together, and enable the slurry layer to withstand a second temperature higher than the first temperature. This overlapping structure allows the first substrate and the second substrate to be connected by the tape layer when the temperature is lower than the first temperature. After entering the drying at the first temperature, the tape layer loses its adhesiveness and the slurry layer serves to bond the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate together, and it can withstand a second temperature higher than the first temperature. In this way, technical support can be provided for avoiding production interruptions and improving the qualification rate and efficiency of GDL coating production. In addition, the method is relatively simple and easy to implement.

[0048] The length of the overlapping portion between the first overlapping region of the first substrate and the second overlapping region of the second substrate is 40-60 mm.

[0049] Wherein, the width of the first substrate and the second substrate are both 300-500 mm.

[0050] The lengths of the first adhesive tape layer and / or the second adhesive tape layer are both smaller than the widths of the first substrate and the second substrate, and are both greater than or equal to 0.95 times the widths of the first substrate and the second substrate.

[0051] Wherein, the first substrate and the second substrate are both carbon fiber substrates.

[0052] The components of the slurry include graphite, carboxymethyl cellulose and polyvinyl pyrrolidone.

[0053] The content of graphite is in the range of 5-15 parts by mass, the content of carboxymethyl cellulose is in the range of 1-3 parts by mass, and the content of polyvinyl pyrrolidone is in the range of 5-10 parts by mass. The slurry also includes water, and the content of water is in the range of 70-88 parts by mass.

[0054] Wherein, the first substrate and the second substrate are both fuel cell gas diffusion layer substrates.

[0055] Among them, the first temperature is 100 degrees, and the second temperature is 200-400 degrees.

[0056] Wherein, the first adhesive tape layer and / or the second adhesive tape layer is aluminum foil adhesive tape.

[0057] See also Figure 4 Step S2 may specifically include:

[0058] Sub-step S21 : placing a first substrate and a second substrate opposite to each other so that a first overlapping region of the first substrate and a second overlapping region of the second substrate overlap with each other.

[0059] Sub-step S22: bonding an adhesive tape on the first overlapping region of the first substrate and the second non-overlapping region of the second substrate to form a first adhesive tape layer.

[0060] Sub-step S23: After the slurry is evenly coated on the first overlapping area of ​​the first substrate, the second overlapping area of ​​the second substrate is placed and adhered to the first overlapping area of ​​the first substrate.

[0061] Sub-step S24: bonding the adhesive tape on the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate to form a second adhesive tape layer.

[0062] In this way, the first substrate and the second substrate can be more firmly bonded by two layers of tape before the slurry takes effect, thereby avoiding the impact or interruption of production due to the first substrate and the second substrate being not firmly bonded before the slurry takes effect.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An overlapping piece based on a substrate, characterized in that include: a first substrate comprising adjacent first overlapping regions and first non-overlapping regions; A second substrate includes a second overlapping area and a second non-overlapping area adjacent to each other, wherein the second overlapping area corresponds to the first overlapping area and overlaps with each other; a slurry layer, the slurry layer comprising slurry uniformly distributed between the first overlapping region and the second overlapping region, the slurry layer being capable of bonding the first overlapping region and the second overlapping region together; a first adhesive tape layer, disposed on the first overlapping region of the first substrate and the second non-overlapping region of the second substrate, the first adhesive tape layer being used to bond the first overlapping region of the first substrate and the second non-overlapping region of the second substrate; and / or, a second adhesive tape layer disposed on the first non-overlapping region of the first substrate and the second overlapping region of the second substrate, the second adhesive tape layer being used to bond the first non-overlapping region of the first substrate and the second overlapping region of the second substrate; wherein the first adhesive tape layer and / or the second adhesive tape layer can withstand a first temperature, and the slurry of the slurry layer can bond the first overlapping area and the second overlapping area together after drying at the first temperature, and enable the slurry layer to withstand a second temperature, which is greater than the first temperature; The first temperature is 100 degrees, and the second temperature is 200-400 degrees; The first tape layer and / or the second tape layer is an aluminum foil tape; The components of the slurry include graphite, carboxymethyl cellulose and polyvinyl pyrrolidone.

2. The overlapping member according to claim 1, wherein: The length of the overlapping portion between the first overlapping region of the first substrate and the second overlapping region of the second substrate is 40-60 mm; Wherein, the width of the first substrate and the second substrate are both 300-500 mm; The length of the first tape layer and / or the second tape layer is less than the width of the first substrate and less than the width of the second substrate, and the length of the first tape layer and / or the second tape layer is greater than or equal to 0.95 times the width of the first substrate and greater than or equal to 0.95 times the width of the second substrate.

3. The overlapping piece according to any one of claims 1 to 2, characterized in that: The first substrate and the second substrate are both carbon fiber substrates.

4. The overlapping member according to claim 3, wherein: The content of the graphite is in the range of 5-15 parts by mass, the content of the carboxymethyl cellulose is in the range of 1-3 parts by mass, and the content of the polyvinyl pyrrolidone is in the range of 5-10 parts by mass; the slurry further comprises water, and the content of the water is in the range of 70-88 parts by mass.

5. The overlapping member according to claim 3, wherein: The first substrate and the second substrate are both fuel cell gas diffusion layer substrates.

6. A substrate-based overlapping method, characterized in that: include: Step 1: providing a first substrate and a second substrate, wherein the first substrate comprises a first overlapping region and a first non-overlapping region adjacent to each other, and the second substrate comprises a second overlapping region and a second non-overlapping region adjacent to each other; Step 2: The first substrate and the second substrate are arranged relative to each other so that the first overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate overlap each other, slurry is evenly applied between the first overlapping area and the second overlapping area to form a slurry layer, and an adhesive tape is bonded to the first overlapping area of ​​the first substrate and the second non-overlapping area of ​​the second substrate to form a first adhesive tape layer, and / or an adhesive tape is bonded to the first non-overlapping area of ​​the first substrate and the second overlapping area of ​​the second substrate to form a second adhesive tape layer; wherein the first adhesive tape layer and / or the second adhesive tape layer can withstand a first temperature, and the slurry of the slurry layer can bond the first overlapping area and the second overlapping area together after drying at the first temperature, and enable the slurry layer to withstand a second temperature, which is greater than the first temperature; The first temperature is 100 degrees, and the second temperature is 200-400 degrees; The first adhesive tape layer and / or the second adhesive tape layer is / are aluminum foil adhesive tapes.

7. The method according to claim 6, characterized in that The length of the overlapping portion between the first overlapping region of the first substrate and the second overlapping region of the second substrate is 40-60 mm; Wherein, the width of the first substrate and the second substrate are both 300-500 mm; The length of the first adhesive tape layer and / or the second adhesive tape layer is less than the width of the first substrate and less than the width of the second substrate, and the length of the first adhesive tape layer and / or the second adhesive tape layer is greater than or equal to 0.95 times the width of the first substrate and greater than or equal to 0.95 times the width of the second substrate; Wherein, the first substrate and the second substrate are both carbon fiber substrates.

8. The method according to any one of claims 6 to 7, characterized in that: The components of the slurry include graphite, carboxymethyl cellulose and polyvinyl pyrrolidone; The content of the graphite is in the range of 5-15 parts by mass, the content of the carboxymethyl cellulose is in the range of 1-3 parts by mass, and the content of the polyvinyl pyrrolidone is in the range of 5-10 parts by mass. The slurry further comprises water, and the content of the water is in the range of 70-88 parts by mass.

9. The method according to claim 7, characterized in that The first substrate and the second substrate are both fuel cell gas diffusion layer substrates.

10. The method according to claim 6, characterized in that The step 2 specifically includes: The first substrate and the second substrate are arranged opposite to each other so that a first overlapping region of the first substrate and a second overlapping region of the second substrate overlap each other; bonding an adhesive tape to the first overlapping region of the first substrate and the second non-overlapping region of the second substrate to form a first adhesive tape layer; After uniformly coating the slurry on the first overlapping area of ​​the first substrate, the second overlapping area of ​​the second substrate is placed and adhered to the first overlapping area of ​​the first substrate; An adhesive tape is bonded to the first non-overlapping region of the first substrate and the second overlapping region of the second substrate to form a second adhesive tape layer.

Images