Elastomeric cell frames for fuel cells

Abstract

An elastomeric cell frame for a fuel cell according to an embodiment of the present disclosure serves as a cell frame of a unit cell constituting the fuel cell, and includes: an insert including a membrane electrode assembly having an anode formed on one surface of a polymer electrolyte membrane and a cathode formed on another surface of the polymer electrolyte membrane, and a pair of gas diffusion layers arranged on both surfaces of the membrane electrode assembly; and an elastomeric frame, which is arranged to surround the edge of the insert in an outer area of ​​the insert and is arranged in the form of a plate joined at an interface with the edge of the insert by heat fusion, and a discharge flow path for discharging generated water generated in the insert is formed along the length direction at the edge in the width direction of the elastomeric frame.

Description

Technical Field

[0001] The present disclosure relates to an elastomer cell frame for a fuel cell, and more particularly, to an elastomer cell frame for a fuel cell that allows generated water to be smoothly discharged. Background Art

[0002] A fuel cell is a power generation device that converts the chemical energy of a fuel into electrical energy through an electrochemical reaction in a stack. It can not only supply driving power for industrial, household and vehicle use, but can also be used to supply power to small electronic devices such as portable devices. In recent years, the scope of use of fuel cells is gradually expanding to efficient and clean energy.

[0003] A unit cell of a general fuel cell has a membrane electrode assembly (MEA) located at the innermost side, and the membrane electrode assembly includes a polymer electrolyte membrane capable of moving hydrogen ions (protons) and catalyst layers coated on both surfaces of the electrolyte membrane so that hydrogen and oxygen can react, namely, an anode and a cathode.

[0004] In addition, a gas diffusion layer (GDL) is stacked on the outer portion of the membrane electrode assembly, that is, the outer portion where the anode and the cathode are located, and a separator plate is located on the outer portion of the gas diffusion layer, and a flow field is formed on the separator plate to supply fuel and discharge water generated by the reaction.

[0005] In order to generate a desired level of output from a fuel cell, a fuel cell stack is constructed by stacking a plurality of unit cells having the above configuration in series. The fuel cell stack has end plates coupled to the outermost sides of the unit cells to support and fix the plurality of unit cells.

[0006] Meanwhile, conventionally, in order to facilitate airtightness maintenance and a stacking process of unit cells, a membrane-electrode-gasket assembly (MEGA) integrating a membrane electrode assembly and a gasket is manufactured and used.

[0007] Furthermore, in recent years, an integrated frame integrating an insert and a gasket that joins a gas diffusion layer to a membrane electrode assembly has also been proposed.

[0008] However, the conventional integrated frame uses an adhesive to join the frame and the insert of the plastic material. In addition, when the unit battery is manufactured by using the conventional integrated frame, a separate bonding member and a sealing member are required to bond the separation plate and the integrated frame. Such a process leads to an increase in material cost and manufacturing cost.

[0009] Meanwhile, in the case of a fuel cell, there is a problem in that produced water generated due to a chemical reaction is accumulated on an outer portion of a reaction region, thereby corroding a membrane electrode assembly (MEA).

[0010] Corrosion of the membrane electrode assembly (MEA) greatly affects the durability of the fuel cell and is an important factor that must be prevented.

[0011] Generally, in order to effectively discharge generated water from a fuel cell, a groove structure for discharging water is formed in many cases. However, there is a problem that in the case of a method of discharging generated water by forming a groove for discharging generated water in a membrane electrode assembly (MEA) or a gas diffusion layer (GDL) or collecting generated water on a metal separation plate, generated water still remains in the reaction area.

[0012] Furthermore, there are disadvantages in that manufacturing a groove structure in a thin layer such as a membrane electrode assembly (MEA) and a gas diffusion layer (GDL) is practically difficult to achieve, and when the structure is manufactured on a metal separator plate by forming, a reaction area may be changed.

[0013] The foregoing content explained as background art is only intended to help understanding the background of the present disclosure, but is not intended to indicate that the present disclosure falls within the scope of the prior art known to those skilled in the art. Summary of the invention

[0014] An object of the present disclosure is to provide an elastomer cell frame for a fuel cell, in which a discharge flow path for discharging generated water is formed so that the generated water is smoothly discharged.

[0015] An elastomeric cell frame for a fuel cell according to an embodiment of the present disclosure serves as a cell frame of a unit cell constituting the fuel cell, and includes: an insert including a membrane electrode assembly having an anode formed on one surface of a polymer electrolyte membrane and a cathode formed on another surface of the polymer electrolyte membrane, and a pair of gas diffusion layers arranged on both surfaces of the membrane electrode assembly; and an elastomeric frame, which is arranged to surround the edge of the insert in an outer area of ​​the insert and is arranged in the form of a plate joined at an interface with the edge of the insert by heat fusion, and a discharge flow path for discharging generated water generated in the insert is formed along the length direction at the edge in the width direction of the elastomeric frame.

[0016] A through hole is formed in the central area of ​​the elastomeric frame, and the edge of the insert is arranged and disposed in the through hole. A plurality of first manifold through holes for the reaction gas and the coolant to flow in and out are formed on one side in the length direction with the through hole as a reference, and a plurality of second manifold through holes for the reaction gas and the coolant to flow in and out are formed on the other side in the length direction. On both surfaces of the elastomeric frame, a first diffusion portion for the reaction gas to flow in and out and diffuse simultaneously is formed between the first manifold through hole and the through hole, and a second diffusion portion for the reaction gas to flow in and out and diffuse simultaneously is formed between the through hole and the second manifold through hole, and an exhaust flow path is formed to be separated from the through hole so that the first diffusion portion and the second diffusion portion are directly connected.

[0017] The discharge flow paths are respectively formed at positions corresponding to each other on both surfaces of the elastic body frame.

[0018] The exhaust flow path is divided into an anode side exhaust flow path formed on one surface of the two surfaces of the elastomer frame on which the anode is arranged, and a cathode side exhaust flow path formed on the other surface of the two surfaces of the elastomer frame on which the cathode is arranged, and the anode side exhaust flow path and the cathode side exhaust flow path have different structures from each other.

[0019] The anode side discharge flow path is divided into a main discharge flow path and a branch discharge flow path. The main discharge flow path is used to directly connect the anode side first diffusion part and the anode side second diffusion part formed on one surface of the two surfaces of the elastomer frame on which the anode is arranged. The branch discharge flow path is separated by a predetermined interval along the length direction and branches from the main discharge flow path to the through hole.

[0020] The main exhaust flow path and the branch exhaust flow path do not directly contact the anode-side gas diffusion layer in contact with the anode of the pair of gas diffusion layers.

[0021] The main exhaust flow path is formed in a diffuser shape in which the width of the end portion on the outlet side through which the reaction gas is exhausted gradually increases with respect to the flow direction of the reaction gas.

[0022] The main exhaust flow path is formed in a shape in which the depth of the main exhaust flow path gradually increases toward the outlet side of the exhaust reaction gas based on the flow direction of the reaction gas.

[0023] The cathode side exhaust flow path is formed to directly communicate with a cathode side first diffuser and a cathode side second diffuser formed on the other of the two surfaces of the elastic body frame on which the cathode is provided.

[0024] The cathode-side exhaust flow path is in direct contact with the cathode-side gas diffusion layer in contact with the cathode of the pair of gas diffusion layers.

[0025] The cathode-side exhaust flow path is formed in the shape of a diffuser in which the width of the end portion on the outlet side through which the reaction gas is exhausted gradually increases with respect to the flow direction of the reaction gas.

[0026] The cathode side exhaust flow path is formed in a shape in which the depth of the cathode side exhaust flow path gradually increases toward the outlet side of the exhaust reaction gas based on the flow direction of the reaction gas.

[0027] The embodiments of the present disclosure have the following effects.

[0028] First, corrosion of the MEA can be prevented by causing the produced water produced in the reaction region to flow to a region other than the reaction region.

[0029] Second, by forming the structure for discharging the generated water on the elastic body frame, there is no need to separately form an additional structure for discharging the generated water in the metal separation plate.

[0030] Third, since no additional structural change of the metal separation plate is required, the reaction area can be maintained to the maximum extent.

[0031] Fourthly, since the discharge flow path for discharging the generated water is formed in the elastic body frame, the discharge flow path can be easily realized even with a simple structural change of the injection mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0033] Figure 1 is a diagram showing the configuration of an elastomeric battery frame.

[0034] Figure 2A is a diagram illustrating an anode-side surface of an elastomer frame according to an embodiment of the present disclosure.

[0035] Figure 2B is a diagram illustrating a cathode-side surface of an elastomer frame according to an embodiment of the present disclosure.

[0036] Figure 3A The embodiment according to the present disclosure is shown along Figure 2A Illustration of a cross-sectional view taken along line AA′.

[0037] Figure 3B The embodiment according to the present disclosure is shown along Figure 2A Illustration of a cross-sectional view taken along line BB′.

[0038] Figure 4A is a diagram illustrating a form in which generated water flows in an elastomer frame according to an embodiment of the present disclosure.

[0039] Figure 4B is another diagram illustrating a form in which generated water flows in an elastomer frame according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but will be implemented in various forms, and the embodiments are only intended to make the disclosure of the present disclosure complete, providing embodiments to fully inform the scope of the present disclosure to those skilled in the art. In the accompanying drawings, the same reference numerals refer to the same elements.

[0041] First, in order to explain the present disclosure, a unit battery to which an elastomer battery frame is applied will be described.

[0042] Figure 1 is a diagram showing the configuration of an elastomeric battery frame.

[0043] like Figure 1 As shown, the elastomer battery frame includes: an insert, a membrane electrode assembly 10 and a pair of gas diffusion layers 20 provided on both surfaces of the membrane electrode assembly 10 are bonded to each other; and an elastomer frame 40 integrally formed at an outer region of the insert by heat fusion. In addition, a pair of separator plates 30a, 30b are located on both surfaces of the elastomer frame 40 integrally formed with the membrane electrode assembly 10 and the pair of gas diffusion layers 20, and flow paths are formed in the separator plates 30a, 30b to supply the reaction gas and discharge the generated water produced by the reaction.

[0044] The insert is an assembly in which a membrane electrode assembly 10 and a pair of gas diffusion layers 20 are stacked, and preferably, the gas diffusion layers 20 are respectively provided and stacked on one surface and the other surface of the membrane electrode assembly 10. At this time, the membrane electrode assembly 10 includes a polymer electrolyte membrane 11 capable of moving hydrogen ions (protons) and catalyst layers coated on both surfaces of the electrolyte membrane to react hydrogen and oxygen, namely, an anode 12 and a cathode 13.

[0045] The elastomeric frame 40 is a device integrally formed in the outer area of ​​the insert in order to facilitate the airtightness maintenance and lamination process of the insert, and the elastomeric frame 40 is formed of a thermoplastic elastomer (TPE) so as to be joined by heat welding without a separate bonding component while maintaining a predetermined shape.

[0046] At this time, the thermoplastic elastomer (TPE) may be formed of a resin-based hard segment and a rubber-based soft segment. Therefore, the resin-based hard segment contributes to the thermal welding of the elastomer frame 40, and the rubber-based soft segment contributes to elasticity and shape retention.

[0047] Therefore, styrene-based, olefin-based, urethane-based, amide-based, polyester-based, etc. can be applied as thermoplastic elastomers (TPE), and preferably, polyolefin-based thermoplastic elastomers (TPE) can be applied. Then, the resin-based hard segment can be formed of a polyolefin resin such as polyethylene (PE) or polypropylene (PP), and the rubber-based soft segment can be formed of an olefin-based rubber such as ethylene propylene diene monomer (EPDM) rubber.

[0048] Meanwhile, the elastomer frame 40 is provided to surround any one of the two surfaces of the edge of the insert and the side surface in the outer region of the insert, and is integrally formed by heat-fusion bonding at the interface with the membrane electrode assembly 10 and the gas diffusion layer 20 exposed to any one of the two surfaces of the edge of the insert and the side surface. Here, the "outer region" of the insert means a region including the edge region of the insert and the space around the insert, and the "edge" of the insert means the edge region of the insert.

[0049] The elastomeric frame 40 is provided to surround the outer region of the insert while facing one surface and the side surface of the edge of the insert. In particular, the elastomeric frame 40 may extend the interface with the insert to be airtightly bonded with the insert.

[0050] For example, the elastic body frame 40 is formed with an insert through hole 41 in which the insert is disposed, and an inner peripheral surface of the insert through hole 41 is formed with a step portion 44 surrounding one surface and a side surface of the insert.

[0051] Therefore, welded portions are formed at interfaces between the insert and the elastic body frame 40 by heat welding, so that the insert and the elastic body frame 40 are firmly bonded and integrated with each other.

[0052] In addition, the elastomeric frame 40 is formed with an inlet manifold through-hole 42 and an outlet manifold through-hole 43, which are used to form a manifold to allow the reaction gas and the coolant to flow into the reaction area formed by the insert, i.e., the membrane electrode assembly 10 and the gas diffusion layer 20 and to allow the reaction gas and the coolant to be discharged from the reaction area formed by the insert, i.e., the membrane electrode assembly 10 and the gas diffusion layer 20.

[0053] Meanwhile, the separation plates 30a, 30b are generally manufactured in a structure in which a land serving as a metal support and a channel (flow path) serving as a fluid flow path are repeatedly formed.

[0054] Hereinafter, an elastomer battery frame according to an embodiment of the present disclosure will be described in more detail with reference to the accompanying drawings.

[0055] Figure 2A is a diagram showing an anode-side surface of an elastomer frame according to an embodiment of the present disclosure, Figure 2B is a diagram showing a cathode side surface of an elastomer frame according to an embodiment of the present disclosure, Figure 3A and Figure 3B is a diagram showing a cross-sectional view of a main part of an elastomer frame according to an embodiment of the present disclosure. Figure 3A Shown along Figure 2A The cross section taken by line AA′ is Figure 3B Shown along Figure 2A The cross section is taken along line BB′.

[0056] As shown in the figure, refer to Figure 1 The described elastomeric battery frame, according to an embodiment of the present disclosure, includes: an insert, a membrane electrode assembly 10 in which an anode 12 is formed on one surface of a polymer electrolyte membrane 11 and a cathode 13 is formed on the other surface of the polymer electrolyte membrane 11, and a pair of gas diffusion layers 20a, 20b arranged on both surfaces of the membrane electrode assembly 10 are joined to each other; and an elastomeric frame 100, which is arranged to surround the edge of the insert in the outer area of ​​the insert and is arranged in the form of a plate joined at an interface with the edge of the insert by heat welding.

[0057] Since the configuration and composition of the insert refer to Figure 1 The configuration of the inserts of the described elastomeric battery frames is the same, so repeated descriptions will be omitted.

[0058] Likewise, since the configuration of the elastomeric frame 100 is also similar to that of the reference Figure 1 The configuration of the elastomer frame 40 of the elastomer battery frame is described above, and thus a repeated description will be omitted.

[0059] The elastic body frame 100 is formed with an insert through hole 101 in the central region, and the edge of the insert is placed and arranged in the insert through hole 101. In addition, a plurality of first manifold through holes 110 through which the reaction gas and the coolant flow in and out are formed on one side in the length direction with the insert through hole 101 as a reference, and a plurality of second manifold through holes 120 through which the reaction gas and the coolant flow in and out are formed on the other side in the length direction.

[0060] Here, the length direction of the elastomer frame 100 indicates the direction in which the reaction gas and the coolant flow in the elastomer frame, and the width direction of the elastomer frame 100 to be described later indicates a direction perpendicular to the length direction of the elastomer frame 100. Figure 2A and Figure 2B , the length direction represents the "y" direction, and the width direction represents the "x" direction.

[0061] In addition, on both surfaces of the elastomer frame 100, first diffusion portions 102a, 102b for simultaneously diffusing the inflow and outflow of the reaction gas are formed between the first manifold through hole 110 and the insert through hole 101, and second diffusion portions 103a, 103b for simultaneously diffusing the inflow and outflow of the reaction gas are formed between the insert through hole 101 and the second manifold through hole 120.

[0062] Meanwhile, discharge flow paths 130 and 140 for discharging generated water generated in the insert are formed at the edges in the width direction of the elastomer frame 100 according to the present disclosure in the length direction.

[0063] At this time, the exhaust flow paths 130 and 140 are formed to be separated from the insert through hole 101 so that the first diffusers 102a and 102b and the second diffusers 103a and 103b are directly connected. Therefore, the exhaust flow paths 130 and 140 directly receive the pressure of the reaction gas flowing through the first diffusers 102a and 102b and the second diffusers 103a and 103b so that the generated water flows smoothly in the exhaust flow paths.

[0064] Meanwhile, the elastomer frame 100 differs in structure in that one surface is provided with the anode 12 and the other surface is provided with the cathode 13. In addition, the amount and flow rate of produced water generated in the anode 12 and the cathode 13 are also different.

[0065] Therefore, the exhaust flow paths 130, 140 formed on both surfaces of the elastomer frame 100 are divided into an anode side exhaust flow path 130 formed on one surface of the two surfaces of the elastomer frame 100 on which the anode 12 is provided, and a cathode side exhaust flow path 140 formed on the other surface of the two surfaces of the elastomer frame 100 on which the cathode 13 is provided. In addition, preferably, the anode side exhaust flow path 130 and the cathode side exhaust flow path 140 may be formed in structures different from each other.

[0066] However, since the generated water is greatly affected by gravity, the exhaust flow paths 130, 140 are formed on both surfaces of the elastomer frame 100, that is, the anode side exhaust flow path 130 and the cathode side exhaust flow path 140 are respectively formed at positions corresponding to each other on both surfaces of the elastomer frame 100. Preferably, when the elastomer frame 100 is installed to constitute a unit cell of a fuel cell, it is advantageous to form the exhaust flow paths 130, 140 at the edges in the width direction in the lower direction based on the gravity direction.

[0067] Hereinafter, both surfaces of the elastomer frame 100 will be described separately.

[0068] First, one of the two surfaces of the elastomer frame 100 on which the anode 12 is provided will be described.

[0069] like Figure 2A As shown, on one surface of the elastomer frame 100, an anode-side first diffusion portion 102a is formed between the first manifold through-hole 110 and the insert through-hole 101, and an anode-side second diffusion portion 103a is formed between the insert through-hole 101 and the second manifold through-hole 120, where the reaction gas flows in and out and diffuses simultaneously.

[0070] Therefore, the anode-side exhaust flow path 130 is formed to connect the anode-side first diffuser 102 a and the anode-side second diffuser 103 a .

[0071] At this time, the anode side exhaust flow path 130 is divided into a main exhaust flow path 131 and a branch exhaust flow path 132. The main exhaust flow path 131 is used to directly connect the anode side first diffuser 102a and the anode side second diffuser 103a. The branch exhaust flow path 132 is separated by a predetermined interval along the length direction and branches from the main exhaust flow path 131 to the insert through hole 101.

[0072] Meanwhile, the branch discharge flow path 132 is a flow path for easily discharging the produced water produced in the anode side reaction region 101a to the main discharge flow path 131. For this purpose, the branch discharge flow path 132 is preferably formed to communicate with the insert through hole 101 provided with the insert.

[0073] In addition, if Figure 2A As shown, the main exhaust flow path 131 is preferably formed in a diffuser shape in which the width of the outlet side end portion for exhausting the reaction gas gradually widens based on the flow direction of the reaction gas. Therefore, the exhaust efficiency of the generated water can be improved.

[0074] In addition, although not shown in the drawings, the main exhaust flow path 131 may be formed in a shape where the depth of the main exhaust flow path 131 gradually increases toward the outlet side of the exhaust reaction gas based on the flow direction of the reaction gas. Therefore, the exhaust efficiency of the generated water can be further improved.

[0075] Next, the other of the two surfaces of the elastomer frame 100 on which the cathode 13 is provided will be described.

[0076] like Figure 2B As shown, on the other surface of the elastomer frame 100, a cathode-side first diffusion portion 102b is formed between the first manifold through hole 110 and the insert through hole 101, and a cathode-side second diffusion portion 103b is formed between the insert through hole 101 and the second manifold through hole 120, where the reaction gas flows in and out and diffuses simultaneously.

[0077] Therefore, the cathode side discharge flow path 140 is a flow path for easily discharging the produced water generated in the cathode side reaction region 101 b to the outside, and is formed to connect the cathode side first diffuser 102 b and the cathode side second diffuser 103 b .

[0078] However, the cathode side discharge flow path 140 is formed to directly contact the cathode side gas diffusion layer 20b. Therefore, the produced water produced in the cathode 13 flows into the cathode side gas diffusion layer 20b and then directly flows into the cathode side discharge flow path 140 to be smoothly discharged.

[0079] In addition, if Figure 2B As shown, the cathode side discharge flow path 140 is preferably formed in a diffuser shape in which the width of the outlet side end portion for discharging the reaction gas gradually widens based on the flow direction of the reaction gas. Therefore, the discharge efficiency of the generated water can be improved.

[0080] In addition, although not shown in the drawings, the cathode side exhaust flow path 140 may be formed in a shape in which the depth of the cathode side exhaust flow path 140 gradually increases toward the outlet side of the exhaust reaction gas based on the flow direction of the reaction gas. Therefore, the exhaust efficiency of the generated water can be further improved.

[0081] Next, the form in which generated water flows in the elastic body frame will be described with reference to the drawings.

[0082] Figure 4A and Figure 4B is a diagram illustrating a form in which generated water flows in an elastomer frame according to an embodiment of the present disclosure.

[0083] First, if Figure 4A As shown, the generated water generated in the cathode 13 directly contacts the cathode side gas diffusion layer 20b. Therefore, the generated water generated in the cathode 13 flows into the cathode side gas diffusion layer 20b and then directly flows into the cathode side discharge flow path 140 to be discharged smoothly.

[0084] At this time, since the end of the cathode side separator 30b is provided in the form of being mounted to the edge of the elastomer frame 100, the stress of the end region of the cathode side separator 30b can be absorbed by the elastomer frame 100, thereby preventing the polymer electrolyte membrane 11 from being damaged.

[0085] Next, if Figure 4B As shown, the generated water generated in the anode 12 flows into the main discharge flow path 131 through the branch discharge flow path 132 , and then moves toward the outlet due to the pressure difference between both ends of the main discharge flow path 131 .

[0086] Although the present disclosure has been described with reference to the accompanying drawings and the preferred embodiments described above, the present disclosure is not limited thereto but is defined by the claims described. Therefore, those skilled in the art may make various changes and modifications to the present disclosure without departing from the technical ideas of the claims described.

Claims

1. An elastomer cell frame for a fuel cell, which serves as a cell frame of a unit cell constituting the fuel cell, comprising: an insert including a membrane electrode assembly having an anode formed on one surface of a polymer electrolyte membrane and a cathode formed on another surface of the polymer electrolyte membrane, and a pair of gas diffusion layers provided on both surfaces of the membrane electrode assembly; as well as An elastomeric frame is configured to surround the edge of the insert in an outer area of ​​the insert and is provided in the form of a plate joined at an interface with the edge of the insert by heat welding, and a discharge flow path for discharging generated water generated in the insert is formed along the length direction at the edge in the width direction of the elastomeric frame.

2. The elastomeric cell frame for a fuel cell according to claim 1, wherein: A through hole is formed in the central area of ​​the elastic body frame, and the edge of the insert is placed and arranged in the through hole. A plurality of first manifold through holes for reactant gas and coolant to flow in and out are formed on one side in the length direction based on the through hole, and a plurality of second manifold through holes for reactant gas and coolant to flow in and out are formed on the other side in the length direction. On both surfaces of the elastic body frame, a first diffusion portion for simultaneously diffusing the reaction gas flowing in and out is formed between the first manifold through hole and the through hole, and a second diffusion portion for simultaneously diffusing the reaction gas flowing in and out is formed between the through hole and the second manifold through hole, and The exhaust flow path is formed to be separated from the through hole so that the first diffuser and the second diffuser are directly communicated.

3. The elastomeric cell frame for a fuel cell according to claim 2, wherein: The discharge flow paths are respectively formed at positions corresponding to each other on both surfaces of the elastic body frame.

4. The elastomeric cell frame for a fuel cell according to claim 3, wherein: The exhaust flow path is divided into an anode side exhaust flow path formed on one of the two surfaces of the elastic body frame where the anode is provided and a cathode side exhaust flow path formed on the other of the two surfaces of the elastic body frame where the cathode is provided, and The anode-side exhaust flow path and the cathode-side exhaust flow path have structures different from each other.

5. The elastomeric cell frame for a fuel cell according to claim 4, wherein: The anode side discharge flow path is divided into a main discharge flow path and a branch discharge flow path, the main discharge flow path is used to directly connect the anode side first diffusion part and the anode side second diffusion part formed on one surface of the two surfaces of the elastomer frame on which the anode is provided, and the branch discharge flow paths are separated by predetermined intervals along the length direction and branch from the main discharge flow path to the through hole.

6. The elastomeric cell frame for a fuel cell according to claim 5, wherein: The main exhaust flow path and the branch exhaust flow path do not directly contact the anode-side gas diffusion layer in contact with the anode of the pair of gas diffusion layers.

7. The elastomeric cell frame for a fuel cell according to claim 5, wherein: The main exhaust flow path is formed in a diffuser shape in which a width of an end portion on an outlet side through which the reaction gas is exhausted gradually increases with respect to a flow direction of the reaction gas.

8. The elastomeric cell frame for a fuel cell according to claim 5, wherein: The main exhaust flow path is formed in a shape in which the depth of the main exhaust flow path gradually increases toward an outlet side through which the reaction gas is exhausted, based on the flow direction of the reaction gas.

9. The elastomeric cell frame for a fuel cell according to claim 4, wherein: The cathode side exhaust flow path is formed to directly communicate a cathode side first diffusion portion and a cathode side second diffusion portion formed on the other surface of the two surfaces of the elastic body frame on which the cathode is provided.

10. The elastomeric cell frame for a fuel cell according to claim 9, wherein: The cathode-side exhaust flow path is in direct contact with the cathode-side gas diffusion layer in contact with the cathode among the pair of gas diffusion layers.

11. The elastomeric cell frame for a fuel cell according to claim 9, wherein: The cathode-side exhaust flow path is formed in a diffuser shape in which a width of an end portion on an outlet side through which the reaction gas is exhausted gradually increases with respect to a flow direction of the reaction gas.

12. The elastomeric cell frame for a fuel cell according to claim 9, wherein: The cathode side exhaust flow path is formed in a shape in which the depth of the cathode side exhaust flow path gradually increases toward an outlet side through which the reaction gas is exhausted, based on the flow direction of the reaction gas.

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