Frame gasket for fuel cell and forming method thereof

Abstract

The present invention discloses a frame gasket for a fuel cell and a molding method thereof. The frame gasket comprises: a base portion, which is arranged along the outer periphery of a battery pack component for the purpose of airtightness of the fuel cell pack and is formed of a mixed material of a first elastic base material and reinforcing fibers; and a first protrusion portion, which protrudes from the base portion and is formed of a second elastic base material.

Description

[0001] This application is a divisional application of the application with application number 201611126377.7, application date December 9, 2016, and invention name “Frame gasket for fuel cell and molding method thereof”. Technical Field

[0002] The present invention relates to a frame gasket for a self-standing fuel cell and a molding method thereof, which can make the elastic body itself have sufficient rigidity even without using an insert, and can also improve its airtight durability. Background Art

[0003] Polymer Electrolyte Membrane Fuel Cell (PEMFC) is widely used as a fuel cell for automobiles. In order to maintain the airtightness of hydrogen / air as reaction gas and cooling water in the fuel cell stack for automobiles, a gasket is generally required for each cell.

[0004] Gaskets used in fuel cell vehicle battery packs need to simultaneously meet multiple physical property requirements such as hardness within an appropriate range, excellent elasticity or very low compression set, excellent mechanical physical properties, excellent acid resistance / hydrolysis resistance, low diffusivity to hydrogen / air / cooling water, low content of impurities that can induce catalyst poisoning, excellent heat resistance, high electrical insulation, excellent productivity, low price, etc.

[0005] Generally speaking, polymer elastomers that generally meet the above-mentioned physical property requirements and are often used as fuel cell stack gaskets can be roughly classified into fluorine-based, silicone-based, and hydrocarbon-based elastomers.

[0006] Fluorine-based elastomers are roughly classified into fluororubber (FKM), perfluororubber (FFKM), etc., and are currently widely used in various applications in the automotive / construction / petrochemical industries, etc. In particular, fluoroelastomers are considered to be able to be used for a long time under the harsh operating conditions of fuel cell vehicles due to their excellent elasticity, acid resistance, and heat resistance, and have attracted attention as gaskets for battery packs, but they generally have the disadvantages of poor injection moldability and cold resistance and are expensive.

[0007] Silicone elastomers are roughly classified into common silicone elastomers such as polydimethylsiloxane and modified silicone elastomers such as silicon fluoride. As silicone elastomers, liquid phase silicone rubber is used more than solid phase for precision injection molding, which can show excellent injection molding properties, but its disadvantage is that silicon impurities will be dissolved under the operating conditions of fuel cells and can poison the platinum catalyst.

[0008] In addition, as hydrocarbon-based elastomers, ethylene propylene diene monomer rubber (EPDM), ethylene propylene rubber (EPR), isoprene rubber (IR), isobutylene-isoprene rubber (IIR) and the like are more commonly used. They generally have the advantages of excellent cold resistance and low price, but have the disadvantage that their physical properties will be significantly reduced at high temperatures above 100°C, making them difficult to use for a long time.

[0009] Furthermore, in the prior art, as a gasket for a fuel cell, in order to support the gasket with insufficient rigidity, it is integrated with a metal bipolar plate / gas diffusion layer / membrane electrode assembly / resin frame through an insert, or a polymer membrane component is laminated / joined to one side of the gasket. For a battery pack formed by laminating hundreds of batteries, this prior art requires a gasket / insert integration process for each battery or the use of additional membrane components and a membrane / gasket joining process, as well as defects in the integration process (deformation of the bipolar plate and surface contamination, etc.) and quality inspection costs after integration, which become the reasons for increasing costs and reduce the productivity of the battery pack.

[0010] The matters described in the background technology are only intended to enhance the understanding of the background of the invention, and are not intended to be considered as equivalent to the prior art known to ordinary technicians in the technical field to which the invention belongs.

[0011] Prior art literature

[0012] Patent Literature

[0013] Patent Document 1: KR 2009-0006973A

[0014] Patent Document 2: US 2015-0349355A1

[0015] Patent Document 3: JP 2013-175336A Summary of the invention

[0016] 1. Technical issues to be resolved

[0017] The present invention is used to improve the problems mentioned above, and its purpose is to provide a frame gasket for a fuel cell and a molding method thereof. By increasing the rigidity of the gasket itself formed by an elastic component, it can maintain a certain shape without an insert. Therefore, when the gasket is injection molded, not only can the unnecessary process of inserting additional inserts into the mold be omitted, but the airtight performance, durability quality, productivity, commerciality, etc. of the fuel cell can also be improved.

[0018] (II) Technical solution

[0019] The frame gasket for fuel cells of the present invention for achieving the above-mentioned purpose includes: a base, which is arranged along the outer periphery of the bipolar plate or membrane electrode assembly or end plate for the airtightness of the fuel cell stack, has a shape extending along the outer periphery of the bipolar plate or membrane electrode assembly or end plate with a predetermined width and height, and is formed by a first base material with elasticity and reinforcing fibers mixed in the first base material; and a first protrusion, which has a shape protruding and extending from the upper end of the base and is formed by an elastic material.

[0020] The first protrusion may extend from an upper end of the base along the base, and the base and the first protrusion may extend along a peripheral portion of the bipolar plate, the membrane electrode assembly, or the end plate to form a closed loop.

[0021] The first protrusion may be formed of a material including a second base material having elasticity.

[0022] The first base material and the second base material may be the same material, and the base portion and the first protrusion portion may be integrally formed.

[0023] The first protrusion may be formed of a material including a second base material having elasticity and reinforcing fibers mixed in the second base material, and a content of the reinforcing fibers in the first protrusion may be less than a content of the reinforcing fibers in the base portion.

[0024] The mixing ratio of the first base material and the reinforcing fiber in the base may be such that when the content of the first base material is 100 phr, the content of the reinforcing fiber is 10 to 30 phr.

[0025] The first base material may include at least one of EPDM (Ethylene Propylene Diene Monomer), fluorine-based rubber, and silicon-based rubber.

[0026] The first protrusion may be formed of a material including a second base material having elasticity, and hardness of the second base material may be lower than hardness of the first base material.

[0027] The reinforcing fiber may include at least one of carbon fiber, glass fiber, or aramid fiber.

[0028] The width of the first protrusion may be smaller than the length of the reinforcing fiber.

[0029] The first protrusion may be formed of a material including a second base material having elasticity, and may further include a second protrusion formed of the second base material at an upper end of the first protrusion.

[0030] The width of the second protrusion may be smaller than the fiber length of the reinforcing fiber, and the width of the first protrusion may be larger than the length of the reinforcing fiber.

[0031] A plurality of the first protrusions may be arranged at intervals on the upper end of the base, and the plurality of the first protrusions may respectively form closed loops on the upper surface of the base.

[0032] The plurality of first protrusions may extend on the upper surface of the base portion and extend in a manner that changes the inclination.

[0033] The plurality of first protrusions at the upper end of the base may be extended in a zigzag pattern side by side with each other or may be extended in a cross-shaped pattern.

[0034] A plurality of the first protrusions may be spaced apart and arranged at the upper end and the lower end of the base, respectively, and the plurality of the first protrusions may form closed loops on the upper surface and the lower surface of the base, respectively.

[0035] The base may be disposed between the positive electrode plate and the negative electrode plate of the fuel cell along a peripheral portion of a cooling surface formed by the positive electrode plate and the negative electrode plate facing each other.

[0036] The base may be disposed on an upper surface and a lower surface of the membrane electrode assembly along a periphery of the membrane electrode assembly, and both surfaces are in contact with the bipolar plate and the membrane electrode assembly, respectively.

[0037] The base may be arranged along the outer periphery of the end cell heater of the fuel cell stack, with one surface in contact with the end cell heater and the other surface in contact with the end plate of the fuel cell.

[0038] The molding method of the frame gasket for fuel cells of the present invention includes the following steps: molding the base with a mixed material of the first base material having elasticity and the reinforcing fiber; and molding the first protrusion at the upper end of the base with a material including the second base material having elasticity.

[0039] (III) Beneficial effects

[0040] Advantages of the fuel cell frame gasket according to the present invention are as follows.

[0041] First, the elastomer can be directly molded in the mold without inserts (bipolar plate / gas diffusion layer / membrane electrode assembly / resin frame, etc.), and the mechanical rigidity of the flat elastomer base can be enhanced by reinforcing the fiber, thereby improving the shape maintenance ability of the gasket itself.

[0042] Secondly, it has the effect of reducing the cost in terms of processing cost by omitting unnecessary processes such as the integration process of the insert component, the gasket and the insert, the post-processing of the integrated molded product, and the cleaning of the insert.

[0043] Third, since there is no need for an integrated process with the insert, the gasket can completely prevent deformation or surface contamination of the bipolar plate during molding, and has the effect of reducing material costs due to the reduction in molding defects and the reduction in material usage.

[0044] Fourth, in the integration process of the gasket and the plug-in which has insufficient rigidity as in the prior art, an adhesive needs to be coated on the surface of the plug-in in order to maintain the shape of the gasket and arrange it in the desired position, but the present invention does not require such expensive adhesive, and does not require the process of applying the adhesive, thereby having the effect of reducing costs in terms of material costs and processes.

[0045] Fifth, the stability of the gasket structure is improved by the flat and highly rigid elastomeric base, and the protrusions formed on the base can not only absorb the tolerances between other components in the fuel cell, but also improve the airtightness of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figures 1 to 4 FIG. 1 is a schematic diagram showing a cross section of a fuel cell frame gasket according to an embodiment of the present invention.

[0047] Figure 5 FIG. 1 is a scanning electron microscope image (SEM image) showing a fractured surface of a fuel cell frame gasket according to an example of the present invention.

[0048] Figures 6 to 8 It is a schematic plan view showing a fuel cell frame gasket according to an embodiment of the present invention.

[0049] Fig. 9 This is a graph showing the rigidity enhancement effect of the fuel cell frame gasket according to the example of the present invention according to the content of reinforcing fibers.

[0050] Fig.10 This is a graph showing the change in volume resistance of the fuel cell frame gasket according to the example of the present invention according to the reinforcing fiber.

[0051] BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 10: Base 11: Reinforced fiber A

[0053] 20: First protrusion 21: Reinforcement fiber B

[0054] 30: Second protrusion 40: Recess DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in various forms and is not limited to the embodiments described herein. In addition, for ease of description, the size and thickness of each component shown in the drawings are arbitrarily represented, but the present invention is not necessarily limited to what is shown in the drawings.

[0056] like Figure 1 As shown, the frame gasket for fuel cells according to the present invention comprises: a base 10, which is provided along the bipolar plate for the gastightness of the fuel cell. or the outer periphery of the membrane electrode assembly or the end plate is arranged, and is flatly formed of a material in which a first base material having elasticity and reinforcing fibers are mixed; and a first protrusion 20 protrudes from the base 10 and is formed of a material having elasticity.

[0057] The present invention relates to an airtight frame gasket for fuel cell components. The base 10 and the protrusions constituting the gasket are made of a material having elasticity. The elastic materials used for the gasket include fluororubber (FKM), silicone rubber (VMQ), isoprene rubber (IR) and other materials. Figure 5 As shown, the mixed material of EPDM rubber and carbon fiber is shown as a preferred embodiment in the present invention. This is because compared with other elastic materials, EPDM rubber is not only low in price and excellent in cold resistance, but also has excellent performance in chemical resistance.

[0058] In addition, the present invention separately mentions the first base material as the elastic material constituting the base 10 and the second base material as the elastic material constituting the protrusion. For the convenience of manufacturing, the base 10 and the protrusion can be formed of the same elastic material. In this case, the same material can be used for one-time molding, and even if it is molded twice, it can have high material bonding. Moreover, even if the first base material and the second base material are the same and are molded once, the self-supporting fuel cell frame gasket as the object of the present invention can be fully realized because it has a structure in which the reinforcing fiber is mixed only or more with the first base material constituting the base 10.

[0059] On the other hand, when the first base material and the second base material are different materials, it is preferred that the hardness of the second base material constituting the first protrusion 20 or the second protrusion 30 described later is lower than that of the first base material. This is because the hardness of the base 10 is increased due to the reinforcement fiber reinforced for improving the structural stability of the gasket, and thus it is not easily compressed. However, Figures 1 to 4As shown, the first protrusion 20 and the second protrusion 30 do not form a flat surface. Therefore, in order to maintain airtightness by contacting with the battery pack components, the first protrusion 20 and the second protrusion 30 are formed of a material with low hardness. When tightening the battery, the force required for compression (tightening load) can be minimized. Therefore, in the present invention, the airtightness of the frame gasket for the fuel cell can be fully maintained by making the hardness of the second base material lower than the hardness of the first base material. In addition, the first protrusion 20 or the second protrusion 30 with low hardness can absorb the tolerance generated when tightening together with other battery pack components (gas diffusion layer, membrane electrode assembly, etc.), thereby improving the uniformity of the electrochemical performance of each battery constituting the fuel cell.

[0060] However, even if the hardness of the first base material is higher than that of the second base material, since it has basic elasticity, if only the first base material is used, the gasket will inevitably bend to a certain extent, so inserting an insert into the mold becomes an indispensable element when the gasket is formed. However, in the present invention, the base 10 of the gasket is not formed only by the first base material, but is formed by mixing reinforcing fibers, thereby strengthening the rigidity of the base 10 to solve this problem.

[0061] There are many kinds of reinforcing fibers that can be mixed with the first base material, but in the present invention, carbon fiber, glass fiber and aramid fiber are proposed as reinforcing fibers suitable for reinforcing the rigidity of the gasket base 10. However, the first base material of the preferred embodiment described above is formed of a hydrocarbon-based EPDM rubber material. Therefore, if carbon fiber, which is mainly composed of carbon, is used as the reinforcing fiber, when the EPDM material of the base 10 and the carbon fiber are mixed, since they are the same carbon-based material, they can be easily mixed without an additional carbon fiber surface treatment process, which is most preferred in terms of cost and manufacturing process.

[0062] Regardless of the type of fiber used in the reinforcing fiber, Figure 1As shown, the width of the first protrusion 20 of the fuel cell frame gasket according to the present invention is smaller than the fiber length of the reinforcing fiber A11. This is because the fuel cell frame gasket of the present invention is basically made by injection molding or compression molding a mixed material of the first base material and the reinforcing fiber in a mold. That is, when molding in the mold, a part of the reinforcing fiber will be oriented according to the flow of the base material, but if the length of the reinforcing fiber A11 is smaller than the width of the first protrusion 20, the mixed material of the first base material and the reinforcing fiber will flow excessively into the first protrusion 20 regardless of the designer's intention, so in order to prevent this, the width of the first protrusion 20 is made smaller than the length of the reinforcing fiber A11. Each type of reinforcing fiber A11 has a different length value, but the length of the glass fiber mentioned above as a typical example of the present invention is 4 mm, the length of the aramid fiber is 5 mm, and the length of the carbon fiber is 3 or 6 mm, and the width of the first protrusion can be changed according to which reinforcing fiber is used.

[0063] Although Figure 2 The composition is basically the same as Figure 1 Same as Figure 1 The difference is that the first protrusion 20 is configured to be opposite to each other on both sides of the base 10, thereby Figure 1 In comparison, the airtightness of the fuel cell can be further improved.

[0064] Figure 3 Basically with Figure 1 The same structure is provided, but a second protrusion 30 formed of a second base material is further provided on the first protrusion 20. That is, the protrusion is configured as two layers of the first protrusion 20 and the second protrusion 20, and it can be confirmed that the width of the second protrusion 30 is smaller than the length of the reinforcing fiber B21, and the width of the first protrusion 20 is larger than the length of the reinforcing fiber B21.

[0065] therefore, Figure 3 In the case of, the rigidity of the gasket can be improved because the reinforcing fiber B21 can penetrate into the first protrusion 20. However, since the first protrusion having the same rigidity as the base 10 is included, the second protrusion 30 is also required to maintain the same or higher airtightness.

[0066] Furthermore, you can Figure 4 As shown in the figure, by forming the recessed portion 40 between the base portion 10 and the first protrusion 20, the penetration of the reinforcing fiber 11 into the first protrusion 20 can be more effectively prevented. In this case, it can be confirmed that the width of the recessed portion 40 is smaller than the width of the first protrusion 20 and smaller than the length of the reinforcing fiber 11, thereby preventing the reinforcing fiber 11 from excessively penetrating into the first protrusion 20.

[0067] The designer can appropriately select the type of reinforcing fiber used for the fuel cell frame gasket and the contact method with each battery component. Figure 1 The structure is still based on Figures 2 to 4 The structure is used for gasket forming.

[0068] Regardless of choice Figures 1 to 4 Which of the structures of can form a plurality of first protrusions 20 on the base 10, specifically, the shape of the plurality of first protrusions 20 is as follows Figure 6 As shown, a plurality of protrusions 20 are arranged on one side of the base 10 at the preset reference interval to form a closed loop. Of course, preferably, for overall airtightness, the first protrusion 20 can be extended along the entire base 10 to form a closed loop, but depending on the specific situation, the first protrusion 20 can also have a shape that extends along the portion of the base 10 that is only located at the multi-manifold and only surrounds the multi-manifold. According to the present invention, the airtightness of the fuel cell can be further improved based on such a plurality of protrusions.

[0069] Moreover, according to the present invention, Figure 7 As shown in FIG. 1 , the plurality of first protrusions 20 may not be arranged in a row but may be extended in a zigzag shape while maintaining a certain angle, and as shown in FIG. Figure 8 As shown, the first protrusion 20 is arranged crosswise to form a closed loop. For example, the first protrusion 20 has an inclination in a zigzag shape and forms a closed loop in a manner of changing the inclination. The reason for forming the first protrusion 20 in such a crosswise manner is that when the gasket is formed in such a manner, the resistance to the flow direction of the mixed material of the first base material and the reinforcing fiber A11 will increase, so compared with the structure in which the first protrusion 20 is arranged in a row, the probability of the mixed material of the first base material and the reinforcing fiber A11 penetrating into the first protrusion 20 will be reduced. In addition, even if the base 10 and the first protrusion are formed at the same time, the content of the reinforcing fiber A11 in the base 10 can be made higher.

[0070] Compared with the prior art, the rigidity of the fuel cell gasket made of the structure is significantly enhanced. Fig. 9 The curve diagram confirms. Fig. 9This is a graph showing the elongation of tensile strength when the first base material of the base 10 is made of EPDM rubber and carbon fiber is added as a reinforcing fiber. Compared with the case where no carbon fiber is mixed, it can be confirmed that the rigidity of the fuel cell frame gasket is enhanced by mixing 10 to 30 phr (Parts per Hundred Rubber) of carbon fiber. In addition, when the carbon fiber content is more than 40 phr, the miscibility with EPDM rubber will deteriorate, and the molding workability will also decrease. Therefore, from the perspective of the miscibility of carbon fiber and EPDM rubber, rigidity enhancement, product cost and insulation resistance described later, the content of carbon fiber used for mixing is preferably about 10 to 30 phr.

[0071] Fig.10 This is a graph showing the volume resistivity of a gasket test piece measured to confirm the insulation properties of the fuel cell gasket of the present invention. Fig.10 Before explaining, it is necessary to explain that Fig.10 The portion recorded as prior art in the graph of means the volume resistance of the fuel cell gasket previously manufactured by the applicant, and this is not a known technology.) The gasket used for fuel cells is different from the gasket used for other devices. Since it is in direct contact with the membrane electrode assembly and bipolar plate that generate and flow electricity, electrical insulation becomes a very important factor. In the manufacture of gaskets, it is very important to know what value the volume resistance related to electrical insulation has. Fig.10 It can be confirmed that, compared with the prior art, when aramid fiber or glass fiber is mixed into EPMD, its volume resistivity does not decrease significantly, so even if the reinforcing fiber is mixed, there is no major problem in the electrical insulation of the gasket.

[0072] When carbon fibers are mixed, unlike the gaskets of fuel cells previously used by the present applicant, it can be confirmed that the volume resistance is reduced, and the volume resistance value is 1×10[Ω.cm] or more until the reinforcement content is 30phr, so there is no problem in terms of electrical insulation. On the contrary, as mentioned above, using carbon fibers with good miscibility (compatibility) with EPDM is beneficial to the production process, so it is preferred to mix carbon fibers with EPDM even if the volume resistance is reduced to a certain extent.

[0073] Meanwhile, the base of the fuel cell frame gasket of the present invention is arranged along the edge of the bipolar plate or the membrane electrode assembly or the end plate. Specifically, the base can be arranged along the edge of the positive plate. and negative plate The edge arrangement of the cooling surfaces formed opposite to each other can be arranged not only along the two edges of the membrane electrode assembly with one side in contact with the bipolar plate and the other side in contact with the membrane electrode assembly, but also along the edge of the end battery heater constituting the battery pack with one side in contact with the end battery heater and the other side in contact with the end plate.

[0074] Furthermore, as a molding method of the fuel cell frame gasket of the present invention, the fuel cell frame gasket mold according to the structure of the present invention can be used to achieve injection molding or compression molding of the base 10 and the first protrusion 20 or the second protrusion 30 at one time.

[0075] However, in this case, even by adjusting the width of the first protrusion 20 or the arrangement of the first protrusion 20 proposed in the present invention, the possibility that a part of the reinforcing fiber (reinforcing fiber A11 or reinforcing fiber B21) penetrates into the first protrusion 20 or the second protrusion 30 cannot be ruled out. In addition, when such penetration occurs, there is a possibility that the air tightness of the fuel cell is reduced.

[0076] Therefore, in order to overcome this problem, the present invention proposes a method of double injection molding or compression molding. Specifically, first, a step of performing an initial molding of the base 10 using a mixed material of a first elastic base material and reinforcing fibers is implemented, and then a second molding of the first protrusion 20 is performed using a second elastic base material to form it on the base 10.

[0077] The frame gasket for fuel cells formed in this way has its base 10 and the first protrusion 20 formed through different molding steps, so there is no need to arrange the protrusion into a complex structure such as the zigzag shape mentioned above, and the material and hardness of the protrusion can be easily changed relative to the base 10, so that the purpose of the present invention can be more easily achieved.

[0078] Although the present invention has been illustrated and described with respect to specific embodiments, it is obvious to those skilled in the art that various modifications and changes may be made to the present invention without departing from the scope of the technical concept of the present invention as described in the claims.

Claims

1. A frame gasket for a fuel cell, comprising: The base is arranged along the outer periphery of the bipolar plate, the membrane electrode assembly or the end plate for the purpose of airtightness of the fuel cell stack, has a shape extending along the outer periphery of the bipolar plate, the membrane electrode assembly or the end plate with a predetermined width and height, and is formed of a first base material having elasticity and reinforcing fibers mixed in the first base material; as well as A plurality of first protrusions are formed of a material including a material having elasticity, and have a shape protruding from the upper end of the base and extending therefrom. A second protrusion is further included at the upper end of the first protrusion. wherein the width of the second protrusion is smaller than the fiber length of the reinforcing fiber, and the width of the first protrusion is larger than the fiber length of the reinforcing fiber, wherein the width of the second protrusion is smaller than the width of the first protrusion, The first protrusion includes reinforcing fibers mixed therein.

2. The fuel cell frame gasket according to claim 1, characterized in that: The first protrusion extends from the upper end of the base along the base, and the base and the first protrusion extend along the outer periphery of the bipolar plate, the membrane electrode assembly or the end plate to form a closed loop.

3. The fuel cell frame gasket according to claim 1, characterized in that: The first protrusion is formed of a material including a second base material having elasticity, The first base material and the second base material are the same material, and the base portion and the first protrusion portion are integrally formed.

4. The fuel cell frame gasket according to claim 1, characterized in that: The first protrusion is formed of a material including a second base material having elasticity and reinforcing fibers mixed in the second base material, and a content of the reinforcing fibers in the first protrusion is less than a content of the reinforcing fibers in the base.

5. The fuel cell frame gasket according to claim 1, characterized in that: The mixing ratio of the first base material and the reinforcing fiber in the base is such that when the content of the first base material is 100 phr, the content of the reinforcing fiber is 10-30 phr.

6. The fuel cell frame gasket according to claim 1, characterized in that: The first base material includes at least one of EPDM rubber, fluorine-based rubber, and silicon-based rubber.

7. The fuel cell frame gasket according to claim 1, characterized in that: The first protrusion is formed of a material including a second base material having elasticity, and the second base material has a lower hardness than the first base material.

8. The fuel cell frame gasket according to claim 1, characterized in that: The reinforcing fiber includes at least one of carbon fiber, glass fiber or aramid fiber.

9. The fuel cell frame gasket according to claim 1, characterized in that: The second protrusion is formed of a second base material having elasticity.

10. The fuel cell frame gasket according to claim 1, characterized in that: A plurality of the first protrusions are arranged at intervals on the upper end of the base, and the plurality of the first protrusions respectively form closed loops on the upper surface of the base.

11. The fuel cell frame gasket according to claim 10, characterized in that: The plurality of first protrusions extend on the upper surface of the base portion and extend with a changing inclination.

12. The fuel cell frame gasket according to claim 10, characterized in that: The plurality of first protrusions are extended in parallel to each other in a zigzag shape or extended in a cross-shaped manner at the upper end of the base.

13. The fuel cell frame gasket according to claim 1, characterized in that: A plurality of the first protrusions are spaced apart from each other at the upper end and the lower end of the base, and the plurality of the first protrusions form closed loops on the upper surface and the lower surface of the base.

14. The fuel cell frame gasket according to claim 1, characterized in that: The base is arranged between the positive electrode plate and the negative electrode plate along the outer periphery of a cooling surface formed by the positive electrode plate and the negative electrode plate of the fuel cell facing each other.

15. The fuel cell frame gasket according to claim 1, characterized in that: The base is arranged along the periphery of the membrane electrode assembly on the upper surface and the lower surface of the membrane electrode assembly, and both surfaces are in contact with the bipolar plate and the membrane electrode assembly respectively.

16. The fuel cell frame gasket according to claim 1, characterized in that: The base is arranged along the outer periphery of the end cell heater of the fuel cell stack, with one surface in contact with the end cell heater and the other surface in contact with the end plate of the fuel cell.

17. A method for forming a fuel cell frame gasket, which is the method for forming a fuel cell frame gasket according to claim 1, comprising the following steps: Forming the base portion using a mixed material of the first base material having elasticity and the reinforcing fiber; as well as The first protrusion is molded at the upper end of the base using a material including a second base material having elasticity.

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