Separator plate for fuel cell and fuel cell stack

Abstract

A separator for a fuel cell, the separator being stacked on a gas diffusion layer provided on a membrane electrode assembly, the separator including: a plate body stacked on the gas diffusion layer and including a flow path portion and a manifold portion, the flow path portion defining a reaction region in which the membrane electrode assembly reacts, the manifold portion being spaced apart from the flow path portion; a through-hole provided in the plate body to guide a target fluid that has passed through the manifold portion to the flow path portion; and a hole cover provided on one surface of the plate body facing the gas diffusion layer to at least partially cover the through-hole, the hole cover defining a movement path through which the target fluid moves.

Description

[0001] Citations of relevant applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2022-0044957, filed with the Korean Intellectual Property Office on April 12, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a separator for a fuel cell and a fuel cell stack, and more specifically, to a separator for a fuel cell and a fuel cell stack capable of improving performance and operating efficiency. Background Technology

[0004] A fuel cell stack is a power generation device that generates electricity through the chemical reaction of fuel (e.g., hydrogen), and fuel cell stacks are configured by stacking dozens or hundreds of fuel cells (cells) in series.

[0005] A fuel cell may include: a membrane electrode assembly (MEA) having an electrolyte membrane configured to allow the movement of positive hydrogen ions; and electrodes (catalyst electrode layers) disposed on two opposing surfaces of the electrolyte membrane and configured to enable the reaction of hydrogen with oxygen. The fuel cell may also include a gas diffusion layer (GDL) configured to be in close contact with the two opposing surfaces of the MEA and to distribute the reactant gases and transfer the generated electrical energy; and a separator (bipolar plate) configured to be in close contact with the gas diffusion layer and to define a flow path.

[0006] The separator may include: an anode separator configured to supply hydrogen as fuel; and a cathode separator configured to supply air as an oxidant. The separator includes channels through which fuel or oxidant flows.

[0007] In addition, in order to configure a fuel cell stack by stacking fuel cells, it is necessary to maintain the seal between the membrane electrode assembly and the reaction surface of the separator, as well as between the cooling surface of the separator.

[0008] For this purpose, a gasket is provided between the membrane electrode assembly and the reaction surface of the separator, as well as the cooling surface of the separator. That is, the gasket is used to prevent the reaction gases (e.g., hydrogen and air) flowing to the reaction surface of the separator from leaking to the outside of the fuel cell stack and to prevent the coolant flowing to the cooling surface of the separator from leaking to the outside of the fuel cell stack.

[0009] The gasket can be integrally formed by injection molding of the edge portions of the two opposing surfaces of the baffle and the edge portions of the two opposing sides of each manifold to allow the inflow and outflow of reactive gases and coolant. The flow path of the reactive gases and coolant can be defined by the gasket.

[0010] At the same time, in order to ensure the sealing when stacking fuel cells, sufficient clamping pressure needs to be applied to the multiple fuel cells with gaskets between them.

[0011] However, a problem in related technologies is that when fastening pressure (pressurization) is applied to the fuel cell, the gaskets disposed on the two opposing surfaces of the separator deform (over-compress). Specifically, the portion of the gasket disposed around the through-holes used to guide the reactant gas (or coolant) introduced through the manifold flow path to the reaction area on the separator is over-compressed, making it difficult to ensure that the flow path (cross-sectional area of ​​the flow path) for the reactant gas or coolant is sufficient. Therefore, it is difficult to smoothly supply the reactant gas or coolant to the reaction area on the separator (the channel between the inlet manifold and the outlet manifold).

[0012] Furthermore, in related technologies, because the entire through-hole of the baffle is covered by a gas diffusion layer (the gas diffusion layer is inserted into the through-hole to block it), the reactant gas introduced into the through-hole inevitably has to pass through the compressed gas diffusion layer when flowing to the reaction zone. Therefore, the following problems exist: the flowability and efficiency of the reactant gas (or coolant) through the through-hole deteriorate, and the pressure difference between the two opposite ends (inlet end and outlet end) of the manifold flow path increases.

[0013] Therefore, in recent years, various studies have been conducted aimed at minimizing the pressure difference while ensuring the smooth flow of both reactant gases and coolant, but the results remain insufficient. Thus, there is a need to develop a technique to minimize the pressure difference while ensuring the smooth flow of both reactant gases and coolant. Summary of the Invention

[0014] This summary is provided to introduce, in a simplified form, some concepts that will be further described in the following detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0015] This disclosure aims to provide a separator for a fuel cell and a fuel cell stack, which can ensure the smooth flow of reactant gases and coolant and improve safety and reliability.

[0016] This disclosure also aims to improve flow efficiency and enable the reactant gas and coolant to flow stably through the through-hole for guiding the reactant gas and coolant introduced through the manifold flow path of the baffle to the reaction zone.

[0017] This disclosure also aims to prevent the sealing member from being over-compressed (deformed) and to reliably ensure the flow path area through which the reactant gas and coolant have flowed through the through-hole.

[0018] This disclosure also aims to ensure the sealing (tightening performance) between fuel cells while ensuring the flow of reactant gases and coolant.

[0019] This disclosure also aims to simplify the structure and manufacturing process and reduce manufacturing costs.

[0020] This disclosure also aims to minimize the distribution deviation (flow deviation) of the reactant gas or coolant and ensure stable output performance.

[0021] The objectives achieved through the implementation methods are not limited to those described above, but also include objectives or effects that can be understood from the schemes or implementation methods described below.

[0022] In one general aspect, a separator for a fuel cell is provided, the separator being configured to be stacked on a gas diffusion layer disposed on a membrane electrode assembly (MEA), the separator comprising: a plate body configured to be stacked on the gas diffusion layer and including a flow path portion and a manifold portion, the flow path portion being configured to define a reaction region configured to react with the membrane electrode assembly, the manifold portion being spaced apart from the flow path portion; a through-hole disposed in the plate body and configured to guide target fluid that has passed through the manifold portion to the flow path portion; and a cap disposed on a surface of the plate body facing the gas diffusion layer and configured to at least partially cover the through-hole, the cap being configured to define a movement path through which the target fluid moves.

[0023] This is to ensure the smooth flow of reactant gases and coolant, and to improve safety and reliability.

[0024] That is, in related technologies, when fastening pressure (pressurization) is applied to a fuel cell, the gaskets disposed on the two opposing surfaces of the separator deform (over-compress). Specifically, the portion of the gasket (sealing member) disposed around the through-hole to guide the reactant gas (or refrigerant) introduced through the manifold flow path to the reaction area on the separator is over-compressed, making it difficult to ensure that the flow path (flow path cross-sectional area) for the reactant gas or refrigerant is sufficient. Therefore, it is difficult to smoothly supply the reactant gas or refrigerant to the reaction area on the separator (the channel between the inlet manifold and the outlet manifold).

[0025] Furthermore, in related technologies, because the entire through-hole of the baffle is covered by a gas diffusion layer (the gas diffusion layer is inserted into the through-hole to block it), the reactant gas introduced into the through-hole inevitably has to pass through the compressed gas diffusion layer when flowing to the reaction zone. Therefore, the following problems exist: deterioration of the flowability and efficiency of the reactant gas (or coolant) through the through-hole, and an increase in the pressure difference between the two opposite ends (inlet end and outlet end) of the manifold flow path.

[0026] However, according to embodiments of this disclosure, the orifice cap can be configured to cover the through-hole, and the orifice cap can define a movement path that is not blocked by the gas diffusion layer. Therefore, the flowability and efficiency of the reactant gas (or coolant) through the through-hole can be ensured, and the output performance of the fuel cell stack can be kept stable.

[0027] Furthermore, according to embodiments of the invention, the orifice cap can support the gas diffusion layer, thereby preventing excessive compression of the portion of the sealing member disposed around the through-hole. Therefore, it is advantageous to ensure both the fuel cell's sealing performance (tightening properties) and the sufficient flow path (flow path cross-sectional area) for the reactant gas and coolant.

[0028] According to an exemplary embodiment of the present disclosure, a separator for a fuel cell may include: a sealing member disposed on a plate body and configured to seal portions located between adjacent through holes, the sealing member being configured to define a distribution channel, the distribution channel being configured to connect a flow path portion to a through hole such that the flow path portion and the through hole are in communication with each other, wherein a cap is located in the distribution channel.

[0029] The cap can have various structures, as long as it has a path for movement.

[0030] According to an exemplary embodiment of the present disclosure, the hole cover may include: a side cover portion disposed on the edge of the through hole; and a top cover portion spaced apart from the plate and configured to cover the through hole, wherein the top cover portion is supported by the side cover portion and the movement path may be limited in the space between the top cover portion and the plate.

[0031] According to an exemplary embodiment of this disclosure, the movement path may be defined as parallel to the plate.

[0032] According to an exemplary embodiment of this disclosure, the hole cover can be integrally formed with the plate body by partially machining a portion of the plate body.

[0033] As described above, according to embodiments of this disclosure, the orifice cover can be formed during the formation of the baffle (during the process of forming the flow path). Therefore, the advantageous effects of simplified structure and manufacturing process, as well as reduced costs, can be obtained.

[0034] According to an exemplary embodiment of the present disclosure, a separator for a fuel cell may include a side hole formed penetratingly in the wall surface of a side cover portion.

[0035] As described above, according to embodiments of this disclosure, side holes can be provided in the side cover portion. Therefore, it is advantageous to ensure smoother flow of the target fluid through the through holes and to reduce the occurrence of pressure differentials within the through holes.

[0036] According to an exemplary embodiment of this disclosure, a separator for a fuel cell may include a reinforcement configured to support a hole cover on the plate body.

[0037] The reinforcement can have various structures, as long as it can support the hole cover on the plate.

[0038] According to an exemplary embodiment of this disclosure, the reinforcing portion may be disposed in the through hole.

[0039] According to an exemplary embodiment of the present disclosure, the reinforcement may include: a central reinforcement member connected to the inner surface of the top cover portion; a first side reinforcement member, one end of which is connected to a side surface of the central reinforcement member and the other end of which is connected to the plate body; and a second side reinforcement member, one end of which is connected to the other side surface of the central reinforcement member and the other end of which is connected to the plate body.

[0040] Specifically, multiple first-side reinforcing members can be provided, and these multiple first-side reinforcing members can be spaced apart from each other in the longitudinal direction of the central reinforcing member. Similarly, multiple second-side reinforcing members can be provided, and these multiple second-side reinforcing members can be spaced apart from each other in the longitudinal direction of the central reinforcing member. As described above, according to embodiments of this disclosure, the multiple first-side reinforcing members and the multiple second-side reinforcing members can be spaced apart from each other in the longitudinal direction of the central reinforcing member. Therefore, the smooth flow of the target fluid can be ensured while providing more stable support to the central reinforcing member.

[0041] According to an exemplary embodiment of the present disclosure, a separator for a fuel cell may include a central hole disposed in a central reinforcing member and formed to pass through one side surface and another side surface of the central reinforcing member.

[0042] As described above, according to embodiments of this disclosure, a central hole can be provided in a central reinforcing member. Therefore, it is advantageous to minimize the reduction in the flow rate of the target fluid caused by the central reinforcing member provided in the hole cover.

[0043] In another general aspect, a fuel cell stack includes: a membrane electrode assembly (MEA); a gas diffusion layer stacked on the MEA; and a separator comprising: a plate body configured to be stacked on the gas diffusion layer and including a flow path portion and a manifold portion, the flow path portion being configured to define a reaction region configured to react with the MEA, the manifold portion being spaced apart from the flow path portion; a through-hole disposed in the plate body and configured to guide target fluid that has passed through the manifold portion to the reaction region; and a cap disposed on a surface of the plate body facing the gas diffusion layer and configured to at least partially cover the through-hole, the cap being configured to define a movement path through which the target fluid moves.

[0044] According to an exemplary embodiment of the present disclosure, the hole cover may include: a side cover portion disposed on the edge of the through hole; and a top cover portion spaced apart from the plate and configured to cover the through hole, wherein the top cover portion is supported by the side cover portion and the movement path may be limited in the space between the top cover portion and the plate.

[0045] According to an exemplary embodiment of this disclosure, a fuel cell stack may include side holes formed penetratingly in the wall surface of a side cover portion.

[0046] According to an exemplary embodiment of this disclosure, a fuel cell stack may include a reinforcement configured to support an orifice cap on a plate.

[0047] According to an exemplary embodiment of the present disclosure, the reinforcement may include: a central reinforcement member connected to the inner surface of the top cover portion; a first side reinforcement member, one end of which is connected to a side surface of the central reinforcement member and the other end of which is connected to the plate body; and a second side reinforcement member, one end of which is connected to the other side surface of the central reinforcement member and the other end of which is connected to the plate body.

[0048] According to an exemplary embodiment of the present disclosure, a fuel cell stack may include a central hole disposed in a central reinforcing member and formed to pass through one side surface and another side surface of the central reinforcing member.

[0049] According to an exemplary embodiment of the present disclosure, a fuel cell stack may include: a sealing member disposed on a plate and configured to seal portions located between adjacent through holes, the sealing member being configured to define a distribution channel, the distribution channel being configured to connect a flow path portion to a through hole such that the flow path portion and the through hole are in communication with each other, wherein a cap is located in the distribution channel.

[0050] According to an exemplary embodiment of this disclosure, the hole cover can be integrally formed with the plate body by partially machining a portion of the plate body.

[0051] Other features and aspects will become apparent from the detailed description, the accompanying drawings, and the claims. Attached Figure Description

[0052] Figure 1 This is a view used to illustrate a fuel cell stack according to an embodiment of the present disclosure.

[0053] Figure 2 This is a cross-sectional view used to illustrate an embodiment of the fuel cell stack according to the present disclosure.

[0054] Figure 3 and Figure 4This is a view used to illustrate the partition of a fuel cell stack according to an embodiment of the present disclosure.

[0055] Figure 5 and Figure 6 This is a view used to illustrate the side holes of a fuel cell stack according to an embodiment of the present disclosure.

[0056] Figure 7 , Figure 8 and Figure 9 This is a view used to illustrate the reinforcement section of a fuel cell stack according to an embodiment of the present disclosure.

[0057] The embodiments of the present invention can be described using the following elements in conjunction with the accompanying drawings.

[0058] 10 Fuel Cell Stacks

[0059] 100 partitions

[0060] 101 Flow Path Section

[0061] 102 Manifold Department

[0062] 110 plate body

[0063] 112 Through Hole

[0064] 120-hole cover

[0065] 120a Movement Path

[0066] 122 Side Cover Section

[0067] 124 Top Cover Section

[0068] 126 side holes

[0069] 130 Sealing component

[0070] 132 Allocation Channel

[0071] 140 Reinforced Department

[0072] 142 Central stiffening member

[0073] 142a Central Hole

[0074] 144 First side reinforcing member

[0075] 146 Second side reinforcing member

[0076] 200 gas diffusion layer

[0077] 300 membrane electrode assembly Detailed Implementation

[0078] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0079] However, the spirit of this disclosure is not limited to the embodiments described herein, but can be implemented in various different forms. Within the scope of the spirit of this disclosure, one or more components in the embodiments can be selectively combined and substituted.

[0080] Furthermore, unless otherwise specifically and explicitly defined and stated, the terminology (including technical and scientific terms) used in the embodiments of this disclosure is to be interpreted as meaning commonly understood by one of ordinary skill in the art to which this disclosure pertains. Common terms (such as those defined in dictionaries) may be interpreted taking into account the textual meaning in the relevant art.

[0081] Furthermore, the terminology used in the embodiments of this disclosure is for the purpose of explaining the embodiments and not for limiting the disclosure.

[0082] In this specification, unless otherwise specified, the singular form may also include the plural form. The expression "at least one of A, B, and C (or one or more of them)" may include one or more of all combinations that can be formed by combining A, B, and C.

[0083] Furthermore, terms such as first, second, A, B, (a) and (b) may be used to describe the constituent elements of embodiments of this disclosure.

[0084] These terms are used only for the purpose of distinguishing one component from another, and the nature, sequence, or order of the components are not limited by these terms.

[0085] Furthermore, when a component is described as “connected,” “joined,” or “attached” to another component, a component may be directly connected, joined, or attached to another component, or connected, joined, or attached to another component through another component in between.

[0086] Furthermore, the phrase "one component is positioned above or below another component" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are positioned or arranged between the two components. The expression "above or below" can refer to the downward or upward direction of a component.

[0087] refer to Figures 1 to 9According to an embodiment of the present disclosure, a fuel cell stack 10 includes: a membrane electrode assembly (MEA) 300; a gas diffusion layer 200 stacked on the MEA 300; and a separator 100 including: a plate body 110 stacked on the gas diffusion layer 200 and including a flow path portion 101 and a manifold portion 102, wherein the flow path portion is configured to define a reaction region configured to react with the MEA 300, and the manifold portion is spaced apart from the flow path portion 101; a through hole 112 formed in the plate body 110 and configured to guide a target fluid (e.g., reactant gas and coolant) that has passed through the manifold portion 102 to the reaction region; and a cap 120 disposed on the surface of the plate body 110 facing the gas diffusion layer 200 and configured to at least partially cover the through hole 112, the cap 120 being configured to define a movement path 120a through which the target fluid moves.

[0088] For reference, the fuel cell stack 10 can be constructed by stacking multiple cell units in a reference direction (e.g., up / down direction).

[0089] A fuel cell (cell unit) may include a reaction layer (not shown) and separators 100 stacked on two respective opposite sides of the reaction layer. A fuel cell stack 10 may be configured by stacking multiple fuel cells in a reference direction and then assembling end plates (not shown) to two opposite ends of the multiple fuel cells.

[0090] More specifically, the reaction layer may include a membrane electrode assembly (MEA) 300 and a gas diffusion layer (GDL) 200 in close contact with two opposite sides of the membrane electrode assembly 300.

[0091] The membrane electrode assembly 300 is used to generate electricity through a redox reaction between a fuel (e.g., hydrogen) as a first reactant gas and an oxidant (e.g., air) as a second reactant gas.

[0092] The membrane electrode assembly 300 can be modified in terms of structure and materials according to the required conditions and design specifications, and this disclosure is not limited or constrained by the structure and materials of the membrane electrode assembly 300.

[0093] For example, the membrane electrode assembly 300 includes an electrolyte membrane through which hydrogen ions move and a catalyst electrode layer attached to two opposing surfaces of the electrolyte membrane, and an electrochemical reaction occurs in the catalyst electrode layer.

[0094] Gas diffusion layer (GDL) 200 is stacked on two opposite sides of membrane electrode assembly 300 and is used to uniformly distribute the reactive gas and transfer the generated electrical energy.

[0095] The gas diffusion layer 200 can have various structures that enable the diffusion of reactant gases. For example, the gas diffusion layer 200 can have a porous structure, wherein each pore of the porous structure has a predetermined size.

[0096] The size and material of the pores in the gas diffusion layer 200 can be varied according to the required conditions and design specifications, and this disclosure is not limited or constrained by the size and material of the pores in the gas diffusion layer 200.

[0097] The baffle 100 is configured not only to block (separate) hydrogen and air as reactant gases, but also to ensure the flow path of reactant gases and coolant and to transfer current to external circuitry.

[0098] In addition, the separator 100 can also be used to distribute the heat generated in the fuel cell (cell) to the entire fuel cell, and the excessive heat generated can be discharged to the outside through the coolant flowing along the cooling channels between the separators 100.

[0099] In an exemplary embodiment of this disclosure, the partition 100 may be defined as including both an anode partition and a cathode partition, wherein the anode partition has a flow path for hydrogen as fuel and the cathode partition has a flow path for air as an oxidant.

[0100] For reference, hydrogen as fuel and air as oxidant are supplied to the anode (not shown) and cathode (not shown) of the membrane electrode assembly 300 through channels in the separators 100 (cathode separator and anode separator), respectively. Hydrogen can be supplied to the anode and air can be supplied to the cathode.

[0101] Hydrogen supplied to the anode is separated into hydrogen ions (protons) and electrons by catalysts in electrode layers disposed on two opposite sides of the electrolyte membrane. Only hydrogen ions are selectively transported to the cathode through the electrolyte membrane, which is a cation exchange membrane, while electrons are simultaneously transported to the cathode through the gas diffusion layer 200 and the separator 100, which are conductors.

[0102] At the cathode, hydrogen ions supplied through the electrolyte membrane and electrons transported through the separator 100 encounter oxygen in the air supplied to the cathode via the air supply device, thereby producing water. Electrons flow through the external wires due to the movement of hydrogen ions, and an electric current is generated as a result of this flow.

[0103] The separator 100 is configured to supply a first reactant gas (e.g., hydrogen) and a second reactant gas (e.g., air) to the membrane electrode assembly 300, and is arranged to be in close contact with one side and the other side (outer surface of the gas diffusion layer) of the membrane electrode assembly 300 in the direction of the fuel cell stack.

[0104] More specifically, the partition 100 includes: a plate body 110 stacked on the gas diffusion layer 200 and including a flow path portion 101 and a manifold portion 102, wherein the flow path portion is configured to define a reaction region configured to react with the membrane electrode assembly 300, and the manifold portion is spaced apart from the flow path portion 101; a through hole 112 formed in the plate body 110 and configured to guide target fluid that has passed through the manifold portion 102 to the flow path portion 101; and a cap 120 disposed on the surface of the plate body 110 facing the gas diffusion layer 200 and configured to at least partially cover the through hole 112, the cap 120 being configured to define a movement path 120a through which the target fluid moves.

[0105] The plate 110 can be configured as a flat film plate, and this disclosure is not limited or constrained by the size, material and structure of the plate 110.

[0106] For example, the plate 110 may be configured as a substantially flat quadrilateral plate and made of commonly used metallic materials (e.g., stainless steel, chromium-nickel-iron alloy, or aluminum). According to another embodiment of this disclosure, the plate may be made of another material such as graphite or carbon composite material.

[0107] The flow path portion 101 is disposed at approximately the central portion of the plate 110 and faces one surface of the membrane electrode assembly 300 to define a reaction region. The flow path portion 101 may include a plurality of flow paths (channels, not shown) spaced apart from each other. This disclosure is not limited or constrained by the number of flow paths or the arrangement of the flow paths.

[0108] Manifold sections 102 (e.g., hydrogen manifold, coolant manifold, and air manifold) are provided penetratingly at two opposite ends of the partition 100, with flow path sections 101 located between these two opposite ends, and these manifold sections 102 are respectively used to move hydrogen, air, and coolant (supplying hydrogen, air, and coolant and discharging hydrogen, air, and coolant).

[0109] For example, a first manifold (not shown) may be provided at one end of the partition 100 and spaced apart from one end of the flow path section 101, and a second manifold (not shown) may be provided at the other end of the partition 100 and spaced apart from the other end of the flow path section 101.

[0110] Specifically, the target fluid (e.g., reactant gas and coolant) may be introduced into either the first manifold or the second manifold, and the target fluid may be discharged from the other of the first manifold and the second manifold.

[0111] For example, the first manifold may include: a hydrogen inlet manifold through which hydrogen is supplied; a coolant inlet manifold through which coolant is supplied; and an air outlet manifold through which air is discharged. Furthermore, the second manifold may include: a hydrogen outlet manifold through which hydrogen is discharged; a coolant outlet manifold through which coolant is discharged; and an air inlet manifold through which air is supplied.

[0112] The manifold 102 can be modified in various ways in terms of structure and shape according to required conditions and design specifications. This disclosure is not constrained or limited by the structure and shape of the manifold 102.

[0113] For example, the hydrogen inlet manifold, coolant inlet manifold, and air outlet manifold can all be permeably disposed at one end of the partition 100 and have a generally trapezoidal or triangular shape. Similarly, the hydrogen outlet manifold, coolant outlet manifold, and air inlet manifold can all be permeably disposed at the other end of the partition 100 and have a generally trapezoidal or triangular shape.

[0114] In addition, a through hole 112 is provided in the plate 110 and is located between the manifold portion 102 and the flow path portion 101.

[0115] The through hole 112 is provided in the plate 110 and guides the target fluid that has passed through the manifold 102 to the flow path 101.

[0116] For example, the reaction gas (e.g., hydrogen) supplied through manifold 102 (e.g., hydrogen inlet manifold) can flow along a surface defined on partition 100 (e.g., based on...). Figure 2 If so, the reaction gas on the bottom surface) is supplied to the through hole 112 via a movement path (not shown). The reaction gas that has passed through the through hole 112 can travel along another surface defined on the partition 100 (e.g., based on...). Figure 2 If so, the distribution channel 132 on the top surface supplies to the flow path section 101.

[0117] The through hole 112 can have various shapes depending on the required conditions and design specifications. This disclosure is not constrained or limited by the structure and shape of the through hole 112.

[0118] For example, the through hole 112 can be configured as an elongated hole with a length greater than its width. Alternatively, the through hole 112 can be circular or other shapes.

[0119] According to an exemplary embodiment of the present disclosure, the fuel cell stack 10 may include a sealing member 130 disposed on the plate 110 and configured to seal a portion between adjacent through holes 112 and define a distribution channel 132 configured to connect a flow path portion 101 to the through holes 112 such that the flow path portion 101 and the through holes 112 are in communication with each other.

[0120] A sealing member 130 may be disposed on the plate 110 and configured to seal the portion between adjacent through holes 112 while simultaneously sealing the portion between the membrane electrode assembly 300 and the separator 100. A plurality of dispensing channels 132 may be defined between the membrane electrode assembly 300 and the separator 100 by the sealing member 130 and connect the flow path portion 101 and the through holes 112, such that the flow path portion 101 and the through holes 112 are in communication with each other. Furthermore, a cap 120 may be positioned within the dispensing channels 132.

[0121] Multiple distribution channels 132 are spaced apart from each other with a predetermined gap corresponding to corresponding through holes 112. One end of each of these distribution channels 132 is connected to the manifold section 102 through the through hole 112, and the other end of each of these distribution channels 132 is connected to the flow path section 101.

[0122] The number, width, and spacing of the distribution channels 132 can be varied according to required conditions and design specifications. This disclosure is not constrained or limited by the number of distribution channels 132, the width of the distribution channels 132, or the spacing between the distribution channels 132.

[0123] The sealing member 130 can be manufactured in various ways according to the required conditions and design specifications, and this disclosure is not limited or constrained by the method of manufacturing the sealing member 130.

[0124] For example, the sealing member 130 can be manufactured by applying or transferring a sealant made of an elastic material such as rubber, silicone or urethane to the surface of the plate 110 or by performing a printing process on the surface of the plate 110 with a sealant.

[0125] According to another embodiment of the invention, the sealing member can be attached to the plate by injection molding. Alternatively, the sealing member can also be manufactured separately from the plate (e.g., by injection molding) and then attached (bonded) to the plate.

[0126] refer to Figures 2 to 4 The orifice cap 120 is disposed on a surface of the plate 110 facing the gas diffusion layer 200 and covers at least a portion of the through hole 112. The movement path 120a through which the target fluid (reactive gas or coolant) moves is defined by the orifice cap 120 between the gas diffusion layer 200 and the plate 110.

[0127] The orifice cap 120 is used to reliably ensure the flowability and flow efficiency of the target fluid through the through-hole 112.

[0128] That is, in the relevant technology, with the partitions stacked on the gas diffusion layer, the entire through-hole is covered by the gas diffusion layer (the gas diffusion layer is inserted into the through-hole to block it), and the reactive gas introduced into the through-hole inevitably needs to pass through the compressed gas diffusion layer when flowing to the reaction region. Therefore, there is a problem of deterioration in the fluidity and flow efficiency of the target fluid.

[0129] Furthermore, in related technologies, when a clamping pressure is applied to a fuel cell stack with the separators stacked on the gas diffusion layer, the portion of the sealing member positioned around the through-hole is excessively compressed, thus distributing the width of the channel (see...). Figure 3 The reduction in L1 makes it difficult to ensure that the flow path (flow path cross-sectional area) of the target fluid (reactant gas and coolant) is sufficient. Therefore, there is a problem that it is difficult to smoothly supply the target fluid to the reaction zone of the baffle (plate).

[0130] However, according to embodiments of this disclosure, the orifice cover 120 may cover the through-hole 112, and the orifice cover 120 may define a movement path 120a that is not blocked by the gas diffusion layer 200. Therefore, the flowability and flow efficiency of the reactant gas (or coolant) through the through-hole 112 can be ensured, and the stable output performance of the fuel cell stack 10 can be ensured.

[0131] Furthermore, according to embodiments of this disclosure, the orifice cap 120 prevents the portion of the sealing member 130 disposed around the through-hole 112 from being over-compressed when fastening pressure is applied to the fuel cell stack 10 (the orifice cap 120 can maintain the width of the distribution channel while supporting the sealing member 130 compressed to a certain level or higher). Therefore, the advantageous effects of ensuring the fuel cell's seal and ensuring sufficient flow paths (flow path cross-sectional area) for the reactant gas and coolant can be obtained. Thus, the advantageous effects of minimizing the deviation between the flow rates of the target fluids supplied to the flow path portion 101 and ensuring stable and uniform output performance of the fuel cell stack 10 can be obtained.

[0132] The cover 120 can have various structures, as long as it has a movement path 120a. This disclosure is not constrained or limited by the structure and shape of the cover 120.

[0133] According to an exemplary embodiment of this disclosure, the hole cover 120 may include: a side cover portion 122 disposed on the edge of the through hole 112; and a top cover portion 124 spaced apart from the plate body 110 and configured to cover the through hole 112, the top cover portion being supported by the side cover portion 122. A movement path 120a may be defined in the space between the top cover portion 124 and the plate body 110.

[0134] For reference, in embodiments of this disclosure, the movement path 120a can be understood as an empty space defined in the orifice cover 120.

[0135] The movement path 120a may have different structures depending on the required conditions and design specifications. According to an exemplary embodiment of this disclosure, the movement path 120a may be defined as generally parallel to the plate 110. According to another embodiment of this disclosure, the movement path may have a curved shape or other shapes.

[0136] The side cover portion 122 can have various structures, as long as it has an opening portion that communicates with the flow path portion 101 (dispensing channel).

[0137] According to an exemplary embodiment of this disclosure, the side cover portion 122 may be continuously disposed along the edge of the through hole 112. For example, the side cover portion 122 may be configured as a continuous "C" shape along the edge of the through hole 112.

[0138] In the embodiments of the present disclosure shown and described above, an example has been described where the side cover portion 122 is arranged in the form of continuous segments. However, according to another embodiment of the present disclosure, a plurality of side cover portions may be arranged to be spaced apart from each other along the edge of the through hole.

[0139] The top cover portion 124 is supported on the end of the side cover portion 122 and spaced apart from the plate body 110. The top cover portion 124 and the side cover portion 122 together define a movement path 120a.

[0140] For example, the top cover portion 124 can be configured as a generally flat plate. The top cover portion 124 and the side cover portion 122 can together define a generally "U" shaped cross-section.

[0141] The gas diffusion layer 200 can be supported on the outer surface of the top cover portion 124 (based on...). Figure 2 (If so, on the top surface). The target fluid that has passed through the through hole 112 can move along the internal space (movement path) of the top cover portion 124.

[0142] The top cover portion 124 can be varied in size according to required conditions and design specifications. This disclosure is not constrained or limited by the dimensions of the top cover portion 124.

[0143] Specifically, the size of the top cover portion 124 (the area in contact with the gas diffusion layer) may correspond to 50% or more of the total area of ​​the through hole 112.

[0144] According to another embodiment of this disclosure, the size of the top cover portion 124 may correspond to less than 50% (e.g., 25%) of the total area of ​​the through hole 112. However, if the size of the top cover portion 124 is less than 50% of the total area of ​​the through hole 112, it is difficult to effectively support the portion of the sealing member 130 disposed around the through hole 112 (it is difficult to prevent the sealing member from being over-compressed). Therefore, the top cover portion 124 may have a size corresponding to 50% or more of the total area of ​​the through hole 112.

[0145] The cover 120 can be set in various ways according to the required conditions and design specifications.

[0146] According to an exemplary embodiment of the present disclosure, the hole cover 120 can be integrally formed with the plate 110 by partially processing (e.g., pressing) a portion of the plate 110.

[0147] Specifically, when a flow path (channel) is formed by partially machining a portion of the plate 110, the orifice cover 120 can be formed together with the flow path (by a single machining process).

[0148] As described above, according to embodiments of this disclosure, the perforation cap 120 can be formed during the formation of the partition 100 (e.g., during the processing that forms the flow path). Therefore, the advantageous effects of simplified structure and manufacturing process and reduced cost can be obtained.

[0149] refer to Figure 5 and Figure 6 According to an exemplary embodiment of the present disclosure, the fuel cell stack 10 may include side holes 126 formed penetratingly in the wall surface of the side cover portion 122.

[0150] The side hole 126 can have various structures depending on the required conditions and design specifications. This disclosure is not limited or constrained by the structure of the side hole 126.

[0151] For example, the side hole 126 may be configured as a generally circular hole. Multiple side holes 126 may be provided, and the multiple side holes 126 may be spaced apart from each other by a predetermined gap. Specifically, multiple side holes 126 may be formed in a first wall surface of the side cover portion 122 and spaced apart from each other by a predetermined gap, and multiple side holes 126 may be spaced apart from each other and formed in a second wall surface of the side cover portion 122 facing the first wall surface. According to another embodiment of this disclosure, only a single side hole may be formed in the wall surface of the side cover portion. Alternatively, the side hole may be configured as a generally elongated hole having a long length.

[0152] With the above structure, the target fluid that has passed through the through hole 112 can be supplied to the flow path section 101 along the movement path 120a, or simultaneously supplied to the flow path section 101 through the side hole 126 bypassing the movement path 120a.

[0153] As described above, according to the embodiments of this disclosure, the side hole 126 may be provided in the side cover portion. Therefore, it is possible to obtain the advantageous effect of ensuring smoother flow of the target fluid through the through hole 112 and reducing the occurrence of pressure differential in the through hole 112.

[0154] refer to Figures 7 to 9 According to an exemplary embodiment of the present disclosure, the fuel cell stack 10 may include a reinforcement 140 configured to support the vent cap 120 on the plate 110.

[0155] The reinforcement 140 is used to prevent the manhole cover 120 from collapsing and to maintain the shape of the manhole cover 120 (ensuring the movement path) when fastening pressure is applied to the fuel cell stack 10.

[0156] The reinforcing part 140 may have various structures capable of supporting the hole cover 120 on the plate 110. This disclosure is not limited or constrained by the structure of the reinforcing part 140.

[0157] For example, the reinforcing part 140 may be provided in the through hole 112. According to another embodiment of the present disclosure, the reinforcing part may be provided outside the through hole (e.g., on the outer surface of the side cover portion).

[0158] According to an exemplary embodiment of the present disclosure, the reinforcement 140 may include: a central reinforcement member 142 connected to the inner surface of the top cover portion 124; first side reinforcement members 144, one end of each first side reinforcement member being connected to one side surface of the central reinforcement member 142 and the other end of each first side reinforcement member being connected to the plate body 110; and second side reinforcement members 146, one end of each second side reinforcement member being connected to the other side surface of the central reinforcement member 142 and the other end of each second side reinforcement member being connected to the plate body 110.

[0159] The central reinforcing member 142 may have various structures capable of supporting the inner surface of the top cover portion 124. For example, the central reinforcing member 142 may have a generally straight shape and be disposed on the central portion of the inner surface of the top cover portion 124.

[0160] The first side reinforcing member 144 and the second side reinforcing member 146 are used to support the central reinforcing member 142 on the plate 110.

[0161] Specifically, multiple first-side reinforcing members 144 may be provided, and these multiple first-side reinforcing members 144 may be spaced apart from each other in the longitudinal direction of the central reinforcing member 142. Multiple second-side reinforcing members 146 may be provided, and these multiple second-side reinforcing members 146 may be spaced apart from each other in the longitudinal direction of the central reinforcing member 142. The first-side reinforcing members 144, the second-side reinforcing members 146, and the central reinforcing member 142 may be collectively defined in a generally fishbone shape.

[0162] As described above, according to embodiments of this disclosure, a plurality of first-side reinforcing members 144 and a plurality of second-side reinforcing members 146 may be spaced apart from each other in the longitudinal direction of the central reinforcing member 142. Therefore, the smooth flow of the target fluid can be ensured while providing more stable support to the central reinforcing member 142.

[0163] Furthermore, according to an exemplary embodiment of the present disclosure, the fuel cell stack 10 may include a central hole 142a disposed in a central reinforcing member 142 and formed to pass through one side surface and another side surface of the central reinforcing member 142.

[0164] For example, multiple central holes 142a can be provided, and multiple central holes 142a can be provided in the central reinforcing member 142 and spaced apart from each other by a predetermined gap. The number of central holes 142a and the gap between the central holes 142a can be varied according to the required conditions and design specifications.

[0165] As described above, according to the embodiments of this disclosure, the central hole 142a can be provided in the central reinforcing member 142. Therefore, it is advantageous to minimize the reduction in the flow rate of the target fluid caused by the central reinforcing member 142 provided in the hole cover 120.

[0166] According to the embodiments of the present disclosure described above, the beneficial effects of ensuring smooth flow of reactant gases and coolant, and improving safety and reliability can be obtained.

[0167] Specifically, according to embodiments of this disclosure, it is possible to obtain the beneficial effects of improved flow efficiency and the ability of reactant gas and coolant to flow stably through the through-holes to guide reactant gas and coolant introduced through the manifold flow path of the baffle to the reaction zone.

[0168] Furthermore, according to embodiments of the present invention, it is possible to obtain the advantageous effects of preventing the sealing member from being over-compressed (deformed) and stably ensuring the flow path area through which the reactant gas and coolant have flowed through the through-hole.

[0169] Furthermore, according to embodiments of this disclosure, the advantageous effect of ensuring the sealing (tightening performance) between fuel cells can be achieved while ensuring the flow of reactant gases and coolant.

[0170] Furthermore, according to the embodiments of this disclosure, the advantages of simplified structure and manufacturing process, as well as reduced manufacturing costs, can be obtained.

[0171] Furthermore, according to embodiments of this disclosure, it is possible to minimize the distribution deviation (flow deviation) of the reactant gas and ensure stable output performance of the fuel cell.

[0172] While embodiments have been described above, they are merely illustrative and not intended to limit this disclosure. Those skilled in the art will understand that various modifications and applications not described above can be made to these embodiments without departing from their inherent characteristics. For example, individual components specifically described in the embodiments may be modified and then implemented. Furthermore, it should be understood that differences related to modifications and applications are included within the scope of this disclosure as defined by the appended claims.

Claims

1. A separator for a fuel cell, the separator being configured to be stacked on a gas diffusion layer disposed on a membrane electrode assembly, the separator comprising: The plate is configured to be stacked on the gas diffusion layer and includes a flow path portion and a manifold portion, the flow path portion being configured to define a reaction region configured to react with the membrane electrode assembly, and the manifold portion being spaced apart from the flow path portion; Multiple through holes are provided in the plate and configured to guide the target fluid that has passed through the manifold to the flow path section; as well as Multiple orifice caps are disposed on a surface of the plate facing the gas diffusion layer and configured to at least partially cover the through-holes, the orifice caps being configured to define a movement path through which the target fluid moves; Each of the aforementioned caps includes: The side cover portion is disposed on the edge of the corresponding through hole; and The top cover portion is spaced apart from the plate body and configured to cover the corresponding through holes, and the top cover portion is supported by the side cover portion. The movement path is limited to the space between the top cover portion and the plate body; Each of the aforementioned caps includes: The reinforcing part is configured to support the hole cover on the plate body; Each of the reinforcing parts includes: A central reinforcing member is connected to the inner surface of the top cover portion; A first side reinforcing member, wherein a first end of the first side reinforcing member is connected to a first side surface of the central reinforcing member and a second end of the first side reinforcing member is connected to the plate; and The second side reinforcement member has a first end connected to the second side surface of the central reinforcement member and a second end connected to the plate.

2. The partition according to claim 1, wherein, The side cover portion is continuously arranged along the edge of the corresponding through hole.

3. The partition according to claim 1, wherein, Each of the aforementioned caps includes: Side hole, penetrating the wall surface of the side cover portion.

4. The partition according to claim 1, wherein, The reinforcing part is disposed in the corresponding through hole.

5. The partition according to claim 1, wherein, Each of the reinforcing members includes: a plurality of first side reinforcing members spaced apart from each other in the longitudinal direction of the central reinforcing member; and a plurality of second side reinforcing members spaced apart from each other in the longitudinal direction of the central reinforcing member.

6. The partition according to claim 1, wherein, Each of the aforementioned reinforcing parts includes: A central hole is provided in the central reinforcing member and passes through the first side surface and the second side surface of the central reinforcing member.

7. The partition according to claim 1, wherein, The movement path is parallel to the plate.

8. The partition according to claim 1, comprising: A sealing member, disposed on the plate and configured to seal portions located between adjacent through holes, is configured to define a dispensing channel connecting the flow path portion and the through holes such that the flow path portion and the through holes communicate with each other. The orifice cover is located in the corresponding distribution channel.

9. The partition according to claim 1, wherein, Each of the hole covers is integrally formed with the plate body by partially machining a portion of the plate body.

10. A fuel cell stack, comprising: Membrane electrode assembly; A gas diffusion layer is stacked on the membrane electrode assembly; as well as The partition includes: The plate is configured to be stacked on the gas diffusion layer and includes a flow path portion and a manifold portion, the flow path portion being configured to define a reaction region configured to react with the membrane electrode assembly, and the manifold portion being spaced apart from the flow path portion; Multiple through-holes are provided in the plate and configured to guide the target fluid that has passed through the manifold to the reaction zone; and Multiple orifice caps are disposed on a surface of the plate facing the gas diffusion layer and configured to at least partially cover the through-holes, the orifice caps being configured to define a movement path through which the target fluid moves; Each of the aforementioned caps includes: The side cover portion is disposed on the edge of the corresponding through hole; and The top cover portion is spaced apart from the plate body and configured to cover the corresponding through holes, and the top cover portion is supported by the side cover portion. The movement path is limited to the space between the top cover portion and the plate body; Each of the aforementioned caps includes: The reinforcing part is configured to support the hole cover on the plate body; Each of the reinforcing parts includes: A central reinforcing member is connected to the inner surface of the top cover portion; A first side reinforcing member, wherein a first end of the first side reinforcing member is connected to a first side surface of the central reinforcing member and a second end of the first side reinforcing member is connected to the plate; and The second side reinforcement member has a first end connected to the second side surface of the central reinforcement member and a second end connected to the plate.

11. The fuel cell stack according to claim 10, wherein, Each of the aforementioned caps includes: Side hole, penetrating the wall surface of the side cover portion.

12. The fuel cell stack according to claim 10, wherein, Each of the aforementioned reinforcing parts includes: A central hole is provided in the central reinforcing member and passes through the first side surface and the second side surface of the central reinforcing member.

13. The fuel cell stack according to claim 10, comprising: A sealing member, disposed on the plate and configured to seal portions located between adjacent through holes, is configured to define a dispensing channel connecting the flow path portion and the through holes such that the flow path portion and the through holes communicate with each other. The orifice cover is located in the corresponding distribution channel.

14. The fuel cell stack according to claim 10, wherein, Each of the hole covers is integrally formed with the plate body by partially machining a portion of the plate body.

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