KR102621204B1 - Separator for fuel cell and fuel cell stack comprising the same - Google Patents

Abstract

The present invention relates to a fuel cell separator plate and a fuel cell stack including the same. More specifically, the first sealing groove, the second sealing groove, and the third sealing groove are formed respectively to apply a double airtight structure to prevent leakage of coolant. It relates to a fuel cell separator that prevents and discharges excessively applied adhesive through a discharge groove, and a fuel cell stack including the same.
In addition, the fuel cell stack according to one aspect of the present invention is characterized in that a double airtight structure is applied to each pair of air manifolds and a pair of fuel manifolds to prevent leakage of reaction gas.

Description

Fuel cell separator and fuel cell stack including the same {Separator for fuel cell and fuel cell stack comprising the same}

The present invention relates to a fuel cell separator plate and a fuel cell stack including the same. More specifically, a double airtight structure is applied to prevent leakage of coolant, and to separate fuel cells in which excessively applied adhesive is discharged through discharge grooves. It relates to a plate and a fuel cell stack including the same.

Fuel cells are a technology that produces energy using hydrogen as a fuel. It is an eco-friendly power generation technology that generates only water and heat as by-products when pure hydrogen is used as a fuel.

In particular, polymer electrolyte membrane fuel cells (PEMFC) are widely used in automobiles because they operate at low temperatures and can be manufactured small and light.

Generally, a fuel cell consists of an electrolyte membrane, a membrane electrode assembly (MEA) consisting of a cathode and an anode, a gas diffusion layer (GDL), a separator, and a gasket. It is used in the form of a stack in which unit cells including a gasket are stacked in multiple layers.

Meanwhile, coolant is used to maintain the appropriate temperature of the fuel cell stack, which generates heat during the energy production process. A groove for coolant is formed in the separator plate, the separator plates are brought into contact with each other, and an adhesive is used to join them together to form a flow path through which the coolant flows.

The adhesive used to join the separator plates is used as an airtight material to maintain the airtightness of the internal coolant flow path at the same time as joining the separator plates.

At this time, if a small amount of adhesive is applied, complete airtightness is not maintained and coolant may leak.

Conversely, if an excessive amount of adhesive is applied, the contact resistance of the separator increases, or the coolant flows into the channel or manifold and blocks the flow path.

The present invention is intended to solve the above problems, and its purpose is to provide a fuel cell separator plate and fuel cell stack that prevent performance degradation due to adhesive while maintaining the airtightness of the coolant flow path of the fuel cell separator plate.

The fuel cell separator according to the present invention for achieving the above-mentioned object has a first surface formed with a first channel through which a reaction gas flows, a second channel through which a coolant flows, and a surface opposite to the first side. a second side, a manifold portion including a pair of air manifolds, a pair of fuel manifolds, and a pair of coolant manifolds formed through the first and second surfaces, a coolant manifold and a second coolant manifold. A first sealing groove formed on the second side to integrally surround the channel portion, a plurality of second sealing groove portions formed on the second side to surround the air and fuel manifolds respectively, and a plurality of second sealing groove portions formed on the second side to integrally surround the second channel portion and the manifold portion. A third sealing groove formed on the second side and provided to surround at least one of the first and second sealing grooves, and a plurality of discharges formed on the second side and connected to the third sealing groove. It includes a groove, and the discharge groove is provided so that the adhesive applied to the third sealing groove is discharged to the outside of the second surface.

In addition, the fuel cell separator plate according to the present invention is characterized by further comprising a first connection groove through which the adhesive can move between the first sealing groove and the third sealing groove.

In addition, the fuel cell separator plate according to the present invention is characterized by further including a second connection groove through which the adhesive can move between the second sealing groove and the third sealing groove.

In addition, in the fuel cell separator plate according to the present invention, the depth of the first connection groove is shallower than the depth of the first sealing groove and the third sealing groove.

Additionally, in the fuel cell separator plate according to the present invention, the depth of the second connection groove is shallower than the depth of the second sealing groove and the third sealing groove.

In addition, in the fuel cell separator according to the present invention, the side walls of each of the first sealing groove, second sealing groove, and third sealing groove become narrower at least in part toward the bottom, and the upper and lower edges of the side walls have curved surfaces. It is characterized by the formation of a wealth.

The fuel cell stack according to the present invention for achieving the above-described object includes an electrolyte membrane, a membrane electrode assembly consisting of a cathode and an oxidation electrode disposed on both sides of the electrolyte membrane, and a gas diffusion layer disposed on both sides of the membrane electrode assembly. , a first channel through which the reaction gas flows is formed and a first side facing the gas diffusion layer, a second channel through which the cooling water flows is formed and a second side opposite to the first side, and the first and second sides are formed. A manifold portion including a pair of air manifolds, a pair of fuel manifolds, and a pair of coolant manifolds formed to penetrate, and a second channel formed on the second surface to integrally surround the coolant manifold and the second channel portion. 1 A sealing groove portion, a plurality of second sealing groove portions formed on the second surface to surround the air and fuel manifolds respectively, and a plurality of second sealing groove portions formed on the second surface to surround the second channel portion and the manifold portion, including the first sealing groove portion and A first separator plate including a third sealing groove portion provided to surround at least one of the second sealing groove portions and a plurality of discharge groove portions formed on the second surface and connected to the third sealing groove portion, through which a reaction gas flows. A third channel portion is formed and is disposed between the second separator plate and the gas diffusion layer and the first separator plate and the second separator plate including a first side facing the gas diffusion layer and a second side opposite to the first side. It includes a gasket to prevent leakage of reaction gas, and the second side of the first separator plate is joined to the second side of the second separator plate to form a coolant flow path, and the discharge groove portion has an adhesive applied to the third sealing groove portion. It is characterized in that it is provided to be discharged to the outside of the second side.

In addition, the fuel cell stack according to the present invention is characterized by further including a first connection groove through which the adhesive can move between the first sealing groove and the third sealing groove.

In addition, the fuel cell stack according to the present invention is characterized by further comprising a second connection groove through which the adhesive can move between the second sealing groove and the third sealing groove.

Additionally, in the fuel cell stack according to the present invention, the depth of the first connection groove is shallower than the depth of the first sealing groove and the third sealing groove.

Additionally, in the fuel cell stack according to the present invention, the depth of the second connection groove is shallower than the depth of the second sealing groove and the third sealing groove.

Additionally, in the fuel cell stack according to the present invention, the first separator plate faces the gas diffusion layer on the cathode side, and the second separator plate faces the gas diffusion layer on the anode side.

In addition, in the fuel cell stack according to the present invention, the side walls of each of the first sealing groove, second sealing groove, and third sealing groove become narrower in width at least in part toward the bottom, and the upper and lower edges of the side walls have curved surfaces. It is characterized by being formed.

The fuel cell separator plate and fuel cell stack according to the present invention can maintain the airtightness of the coolant flow path by forming a double airtight structure in the first sealing groove, second sealing groove, and third sealing groove.

In addition, the fuel cell separator plate and fuel cell stack according to the present invention allow excess adhesive to be discharged to the outside through a discharge groove formed in the outermost portion of the separator plate, thereby preventing performance degradation of the fuel cell due to the adhesive.

In addition, the double airtight structure by the sealing groove can be applied to each manifold to prevent air and fuel leakage at the separator plate joint.

1 is a schematic plan view of a fuel cell separator according to an embodiment of the present invention.
Figure 2 is an enlarged view of portion A of Figure 1.
Figure 3 is an enlarged view of part B of Figure 1.
Figure 4 is an enlarged view of portion C of Figure 1.
Figure 5 is a cross-sectional view taken along line DD' in Figure 1.
Figure 6 is a cross-sectional view taken along line E-E' of Figure 1.
7 is a schematic diagram of a fuel cell stack according to an embodiment of the present invention.
Figure 8 is an enlarged view of portion F of Figure 7.
FIG. 9 is a schematic diagram showing the joining direction of the first and second separator plates shown in FIG. 7.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings.

Before describing embodiments of the present invention in detail with reference to the accompanying drawings, it will be appreciated that the application is not limited to the details of the configuration and arrangement of components described in the following detailed description or shown in the drawings.

The invention may be embodied and practiced in different embodiments and carried out in various ways. Additionally, device or element orientation (e.g. “front”, “back”, “up”, “down”, “top”, “bottom”). The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are merely used to simplify the description of the invention and related devices. Alternatively, you may notice that it does not simply indicate or imply that an element should have a particular orientation.

Additionally, terms such as “first,” “second,” and the like are used herein and in the appended claims for purposes of description and are not intended to indicate or imply relative importance or intent.

In addition, regardless of the drawing numbers, identical or corresponding components are given the same or similar reference numbers and duplicate descriptions thereof are omitted. For convenience of explanation, the size and shape of each component shown are exaggerated or reduced. It can be.

FIG. 1 is a schematic diagram of a fuel cell separator plate according to an embodiment of the present invention, FIG. 2 is an enlarged view of portion A of FIG. 1, FIG. 3 is an enlarged view of portion B of FIG. 1, and FIG. 4 is an enlarged view of portion B of FIG. 1. This is an enlarged view of part C. In addition, FIG. 5 is a cross-sectional view taken along line D-D' of FIG. 1, FIG. 6 is a cross-sectional view cut along line E-E' of FIG. 1, and FIG. 7 is a cross-sectional view of a fuel cell stack according to an embodiment of the present invention. It is a schematic diagram, FIG. 8 is an enlarged view of portion F of FIG. 7, and FIG. 9 is a schematic diagram showing the joining direction of the first and second separator plates shown in FIG. 7.

The separator plate 100 according to an embodiment of the present invention is used in the unit cell 10 including a first separator plate (FIGS. 7 to 9, 200) and a second separator plate (FIGS. 7 to 9, 300). , can function as the first separation plate 200.

As shown in FIGS. 1 to 6, the fuel cell separator plate 100 according to an embodiment of the present invention includes a first surface 110 on which a first channel portion 111 through which a reaction gas flows is formed, It includes a second surface 120 opposite to the first surface 110, a pair of air manifolds formed through the first surface 110 and the second surface 120, and a pair of fuel manifolds. It may include a manifold unit 130 including a fold and a pair of coolant manifolds.

At this time, the air manifold includes an air inlet manifold 133 and an air outlet manifold 134. Additionally, the fuel manifold includes a fuel inlet manifold 135 and a fuel outlet manifold 136. Additionally, the coolant manifold includes a coolant inlet manifold 131 and a coolant outlet manifold 132.

Additionally, the second surface 120 of the separator plate 100 may include a second channel portion 121 through which coolant for cooling the fuel cell flows.

Additionally, the second surface 120 of the separator plate 100 may include a joint portion 140 to which adhesive is applied for bonding. The joint portion 140 is formed on the outer portion of the separation plate 100 and includes a first sealing groove portion 141, a second sealing groove portion 142, and a third sealing groove portion 143 that provide a space for applying adhesive. It can be included.

At this time, the first sealing groove portion 141 may be formed to integrally surround the coolant manifold and the second channel portion 121. At this time, the coolant manifold is preferably disposed in the center of the manifold unit 130, but is not necessarily limited to this.

Additionally, in an embodiment according to the present invention, the width W1 of the first sealing groove 141 may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth d1 of the first sealing groove 141 may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

The second sealing groove portion 142 may be formed to surround the air manifold and fuel manifold, respectively.

At this time, in the embodiment according to the present invention, the width W2 of the second sealing groove 142 may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth d2 of the second sealing groove 142 may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

The third sealing groove portion 143 is formed to surround the entire second channel portion 121 and the manifold portion 130, and includes at least one sealing groove among the first sealing groove portion 141 and the second sealing groove portion 142. It can be arranged to surround wealth.

At this time, in the embodiment according to the present invention, the width W3 of the third sealing groove 143 may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth d3 of the third sealing groove 143 may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

Meanwhile, referring to Figure 2, between the air manifold and fuel manifold and the outermost part, the second sealing groove portion 142 serves as an inner airtight groove and the third sealing groove portion 143 serves as an outer airtight groove. can be performed.

Additionally, referring to FIG. 3, between the coolant manifold and the second channel portion 121 and the outermost portion, the first sealing groove portion 141 serves as an inner airtight groove and the third sealing groove portion 143 It can serve as an external airtight groove.

Additionally, referring to FIG. 4, between the second channel portion 121 and the air manifold and fuel manifold, the first sealing groove portion 141 serves as an inner airtight groove and the second sealing groove portion 142 It can serve as an external airtight groove.

Due to the above structure, when joining the separator plate 100, a double airtight structure including an inner airtight groove and an outer airtight groove is applied, so that the adhesive can be firmly positioned and the airtightness of the coolant and reaction gas can be maintained.

Additionally, a plurality of discharge grooves 147 connected to the third sealing groove 143 may be formed on the outermost side of the second surface 120 of the separation plate 100. At this time, the discharge groove 147 serves as a passage for the adhesive applied to the third sealing groove 143 in excess of the target amount to be discharged to the outside of the second surface 120 when joining the separator plate 100. can do. Additionally, air bubbles generated during the adhesive application process may also be discharged to the outside of the second surface 120 through the discharge groove 147.

At this time, in the embodiment according to the present invention, the width W4 of the discharge groove 147 may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth d4 of the discharge groove 147 may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

Additionally, the width W4 and depth d4 of the discharge groove 147 may be the same as the width W3 and depth d3 of the third sealing groove 143, respectively. Additionally, the width W4 and depth d4 of the discharge groove 147 may be smaller than the width W3 and depth d3 of the third sealing groove 143.

Meanwhile, the second surface 120 of the separation plate 100 may further include a first connection groove 144 through which adhesive can move between the first sealing groove 141 and the third sealing groove 143. . When joining the separator plate 100, the excess adhesive applied to the first sealing groove 141 may move to the third sealing groove 143 through the first connection groove 144 and then back to the discharge groove 147. It can be discharged to the outside of the second surface 120 through .

At this time, in the embodiment according to the present invention, the width W5 of the first connection groove 144 may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth d5 of the first connection groove 144 may be shallower than the depths d1 and d3 of the first sealing groove 141 and the third sealing groove 143. Additionally, the depth d5 of the first connection groove 144 may be in the range of 0.02 to 0.08 mm, and preferably 0.05 mm.

In addition, the second surface 120 of the separation plate 100 may further include a second connection groove 145 through which adhesive can move between the second sealing groove 142 and the third sealing groove 143. . When joining the separator plate 100, the excess adhesive applied to the second sealing groove 142 can move to the third sealing groove 143 through the second connection groove 145, and then back to the discharge groove 147. It can be discharged to the outside of the second surface 120 through .

At this time, in the embodiment according to the present invention, the width W6 of the second connection groove 145 may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth d6 of the second connection groove 145 may be shallower than the depths d2 and d3 of the second sealing groove 142 and the third sealing groove 143. Additionally, the depth d6 of the second connection groove 145 may be in the range of 0.02 to 0.08 mm, and preferably 0.05 mm.

In addition, the second surface 120 of the separation plate 100 may further include a third connection groove 146 through which adhesive can move between the first sealing groove 141 and the second sealing groove 142. .

At this time, in the embodiment according to the present invention, the width (not shown) of the third connection groove 146 may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth (not shown) of the third connection groove 146 may be shallower than the depths d1 and d2 of the first sealing groove 141 and the second sealing groove 142. Additionally, the depth (not shown) of the third connection groove 146 may be in the range of 0.02 to 0.08 mm, and preferably 0.05 mm.

Meanwhile, the side walls of each of the first sealing groove 141, the second sealing groove 142, and the third sealing groove 143 may be formed in a shape that narrows in width toward the bottom of the sealing groove and slopes outward. The upper and lower edges of the side wall may be rounded to form a curved portion. Due to the structure of the side wall described above, adhesive can be applied more firmly and the amount of bubbles generated during application can also be reduced. At this time, in the embodiment according to the present invention, the curved portion r1 formed by rounding the edge portion has a radius of curvature, and the radius of curvature of the curved portion r1 may be in the range of 0.05 to 0.15 mm, and is preferably 0.1 mm. It can be.

As shown in FIGS. 1 to 9 , the fuel cell stack 1 according to an embodiment of the present invention may include a plurality of unit cells 10 and 20 and an end plate 700.

At this time, the unit cell 10 of the fuel cell stack 1 according to an embodiment of the present invention includes a membrane electrode assembly 400, a gas diffusion layer 500, a first separator 200, and a second separator 300. and gasket 600.

The membrane electrode assembly 400 includes a cathode 420, an anode 430, and an electrolyte membrane 410. At this time, a cathode 420 and an oxidation electrode 430 are disposed on both sides of the electrolyte membrane 410, respectively.

In addition, in order to smoothly supply the reaction gas to the membrane electrode assembly 400, gas diffusion layers 500 are disposed on both sides (the reduction electrode side and the anode side) of the membrane electrode assembly 400.

In addition, a first separator plate 200 and a second separator plate 300 are respectively disposed outside the gas diffusion layer 500, in order to maintain airtightness inside the unit cell 10 and compress the gas diffusion layer 500. A gasket 600 may be disposed between the gas diffusion layer 500 and the first and second separator plates 200 and 300.

At this time, the first separator 200 may be arranged to face the gas diffusion layer 500 on the cathode 420 side, and the second separator 300 may be arranged to face the gas diffusion layer 500 on the anode 430 side. there is.

Meanwhile, the first separator plate 200 and the second separator plate 300 each include first surfaces 210 and 310 facing the gas diffusion layer 500 and opposite to the first surfaces 210 and 310. It includes second faces 220, 320, a pair of air manifolds, a pair of fuel manifolds, and a pair of fuel manifolds formed through the first faces 210, 310 and the second faces 220, 320. It may include a manifold unit including a pair of coolant manifolds.

Meanwhile, the first surface 210 of the first separator plate 200 may include a first channel portion 211 through which the reaction gas flows, and the first surface 310 of the second separator plate 300 may include a first channel portion 211 through which the reaction gas flows. It may include a third channel portion 311 through which the reaction gas flows.

At this time, the first surfaces 210 and 310 of the first separator plate 200 and the second separator plate 300 may be combined with the gas diffusion layer 500 to serve as a passage through which the reaction gas flows.

Additionally, the second surface 220 of the first separator 200 may include a second channel portion 221 through which coolant for cooling the fuel cell flows.

At this time, in the process of stacking the plurality of unit cells 10 and 20, the second surface 220 of the first separator plate 200 of one unit cell 10 and the other unit cells 20 stacked thereon The second surface 320 of the second separator plate 300 may be joined to form a coolant flow path.

Additionally, the second surface 220 of the first separator plate 200 may include a joint portion 240 to which adhesive is applied to join the separator plates. The joint portion 240 is formed on the outer portion of the first separator plate 200 and may include a first sealing groove, a second sealing groove, and a third sealing groove that provides a space for applying the adhesive.

At this time, the first sealing groove may be formed to surround the coolant manifold and the second channel portion 221. At this time, the coolant manifold is preferably disposed in the center of the manifold section, but is not necessarily limited to this.

Additionally, in an embodiment according to the present invention, the width of the first sealing groove may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth of the first sealing groove may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

The second sealing groove may be formed to surround the air manifold and the fuel manifold, respectively.

At this time, in the embodiment according to the present invention, the width of the second sealing groove may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth of the second sealing groove may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

The third sealing groove portion is formed to surround the entire second channel portion and the manifold portion, and may be provided to surround at least one of the first sealing groove portion and the second sealing groove portion.

At this time, in the embodiment according to the present invention, the width of the third sealing groove may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth of the third sealing groove may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

Meanwhile, referring to FIG. 2, between the air manifold and the fuel manifold and the outermost part, the second sealing groove portion may serve as an inner airtight groove and the third sealing groove portion may serve as an outer airtight groove.

Additionally, referring to FIG. 3, between the coolant manifold, the second channel portion, and the outermost portion, the first sealing groove portion may function as an inner airtight groove, and the third sealing groove portion may serve as an outer airtight groove. .

Additionally, referring to FIG. 4, between the second channel portion, the air manifold, and the fuel manifold, the first sealing groove portion may function as an inner airtight groove, and the second sealing groove portion may serve as an outer airtight groove. .

Due to the above structure, when joining the first separator plate 200 and the second separator plate 300, a double airtight structure including an inner airtight groove and an outer airtight groove is applied, so that the adhesive can be firmly positioned, and the coolant can be And the confidentiality of the reaction gas can be maintained.

Additionally, a plurality of discharge grooves connected to the third sealing groove portion may be formed on the outermost side of the second surface 220 of the first separator plate 200. At this time, the discharge groove is designed so that the adhesive applied to the third sealing groove in excess of the target amount is discharged to the outside of the second surface 220 when joining the first separator plate 200 and the second separator plate 300. It can serve as a conduit. Additionally, air bubbles generated during the adhesive application process may also be discharged to the outside of the second surface 220 through the discharge groove.

At this time, in the embodiment according to the present invention, the width of the discharge groove may be in the range of 0.2 to 0.8 mm, and preferably, may be in the range of 0.4 to 0.6 mm. Additionally, the depth of the discharge groove may be in the range of 0.1 to 0.3 mm, and preferably, may be in the range of 0.15 to 0.25 mm.

Additionally, the width and depth of the discharge groove may be the same as the width and depth of the third sealing groove, respectively. Additionally, the width and depth of the discharge groove may be smaller than the width and depth of the third sealing groove. Meanwhile, the second surface 220 of the first separation plate 200 may further include a first connection groove through which adhesive can move between the first sealing groove and the third sealing groove. When joining the first separation plate 200 and the second separation plate 300, the excess adhesive applied to the first sealing groove may move to the third sealing groove through the first connection groove and then again through the discharge groove. It may be discharged to the outside of the second surface 220.

At this time, in the embodiment according to the present invention, the width of the first connection groove may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth of the first connection groove may be shallower than the depth of the first sealing groove and the third sealing groove. Additionally, the depth of the first connection groove may be in the range of 0.02 to 0.08 mm, and preferably, may be 0.05 mm.

In addition, the second surface 220 of the first separation plate 200 may further include a second connection groove through which the adhesive can move between the second sealing groove and the third sealing groove. When joining the first separation plate 200 and the second separation plate 300, the excess adhesive applied to the second sealing groove may move to the third sealing groove through the second connection groove and then again through the discharge groove. It may be discharged to the outside of the second surface 220.

At this time, in the embodiment according to the present invention, the width of the second connection groove may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth of the second connection groove may be shallower than the depth of the second sealing groove and the third sealing groove. Additionally, the depth of the second connection groove may be in the range of 0.02 to 0.08 mm, and preferably, may be 0.05 mm.

Additionally, the second surface 220 of the first separation plate 200 may further include a third connection groove through which adhesive can move between the first sealing groove and the second sealing groove.

At this time, in the embodiment according to the present invention, the width of the third connection groove may be in the range of 1.5 to 2.5 mm, and preferably, may be in the range of 1.8 to 2.2 mm. Additionally, the depth of the third connection groove may be shallower than the depth of the first sealing groove and the second sealing groove. Additionally, the depth of the third connection groove may be in the range of 0.02 to 0.08 mm, and preferably 0.05 mm.

Meanwhile, the side walls of each of the first sealing groove, the second sealing groove, and the third sealing groove may be formed in a shape that narrows in width toward the bottom of the sealing groove and slopes outward, and the upper and lower edges of the side walls are rounded. It may be processed to form a curved portion. Due to the structure of the side wall described above, adhesive can be applied more firmly and the amount of bubbles generated during application can also be reduced. At this time, in the embodiment according to the present invention, the curved portion formed by rounding the edge portion has a radius of curvature, and the radius of curvature of the curved portion may be in the range of 0.05 to 0.15 mm, and preferably 0.1 mm.

The preferred embodiments of the present invention described above have been disclosed for illustrative purposes, and various modifications and variations of the technical idea of the present invention are possible by those skilled in the art to which the present invention pertains, and such modifications and variations are possible. will fall within the scope of protection of the present invention.

1: Fuel cell stack
10: unit cell
20: unit cell
100: Separator plate
110: side 1
111: first channel part
120: Side 2
121: Second channel part
130: Manifold part
131: Coolant inlet manifold
132: Coolant discharge manifold
133: Air intake manifold
134: Air exhaust manifold
135: Fuel inlet manifold
136: Fuel discharge manifold
140: junction
141: First sealing groove part
142: Second sealing groove part
143: Third sealing groove part
144: First connection groove
145: Second connection groove
146: Third connection groove
147: Discharge groove
200: first separator plate
210: side 1
211: first channel unit
220: Side 2
221: Second channel unit
240: junction
300: second separator plate
310: side 1
311: Third channel part
320: Side 2
400: Membrane electrode assembly
410: electrolyte membrane
420: reduction electrode
430: Oxidizing electrode
500: gas diffusion layer
600: gasket
700: End plate

Claims (13)

A first surface on which a first channel portion through which a reaction gas flows is formed;
a second surface in which a second channel part through which coolant flows is formed, and which is opposite to the first surface;
A manifold portion including a pair of air manifolds, a pair of fuel manifolds, and a pair of coolant manifolds formed through the first and second surfaces;
a first sealing groove formed on the second surface to integrally surround the coolant manifold and the second channel portion;
a plurality of second sealing grooves formed on the second surface to surround the air and fuel manifolds, respectively;
a third sealing groove portion formed on the second surface to surround the entire second channel portion and the manifold portion, and provided to surround at least one of the first sealing groove portion and the second sealing groove portion;
a first connection groove through which adhesive can move between the first sealing groove and the third sealing groove; and
It includes a plurality of discharge grooves formed on the second surface and connected to the third sealing groove,
A fuel cell separator plate, wherein the discharge groove portion is provided so that the adhesive applied to the third sealing groove portion is discharged to the outside of the second surface. delete According to paragraph 1,
A fuel cell separator plate further comprising a second connection groove through which the adhesive can move between the second sealing groove and the third sealing groove. According to paragraph 1,
A fuel cell separator plate, wherein the depth of the first connection groove is shallower than the depth of the first sealing groove and the third sealing groove. According to paragraph 3,
A fuel cell separator plate, wherein the depth of the second connection groove is shallower than the depth of the second sealing groove and the third sealing groove. According to paragraph 1,
A fuel cell separator plate, wherein the side walls of each of the first sealing groove, second sealing groove, and third sealing groove become narrower at least in part toward the bottom, and curved portions are formed on the upper and lower edges of the side walls. A membrane-electrode assembly consisting of an electrolyte membrane, a cathode and an oxidation electrode disposed on both sides of the electrolyte membrane, respectively;
Gas diffusion layers disposed on both sides of the membrane electrode assembly;
A first channel portion through which the reaction gas flows is formed and faces the gas diffusion layer, and a second channel portion through which the cooling water flows is formed and a second side opposite to the first side is formed, penetrating through the first and second sides. A manifold portion including a pair of air manifolds, a pair of fuel manifolds, and a pair of coolant manifolds, and a first manifold formed on the second surface to integrally surround the coolant manifold and the second channel portion. A plurality of second sealing grooves formed on the second surface to surround the sealing groove portion, air and fuel manifolds, respectively, and formed on the second side to surround the second channel portion and the manifold portion, including the first sealing groove portion and the second sealing groove portion. A third sealing groove portion provided to surround at least one of the two sealing groove portions, a first connecting groove portion through which adhesive can move between the first sealing groove portion and the third sealing groove portion, and a second surface formed on the third sealing groove portion. A first separating plate including a plurality of discharge grooves connected to the groove portions;
a second separator plate in which a third channel through which the reaction gas flows is formed and includes a first surface facing the gas diffusion layer and a second surface opposite to the first surface; and
It includes a gasket disposed between the gas diffusion layer and the first and second separator plates to prevent leakage of the reaction gas,
The second side of the first separator plate is joined to the second side of the second separator plate to form a coolant flow path,
A fuel cell stack, wherein the discharge groove portion is provided so that the adhesive applied to the third sealing groove portion is discharged to the outside of the second surface. delete In clause 7,
A fuel cell stack further comprising a second connection groove through which the adhesive can move between the second sealing groove and the third sealing groove. In clause 7,
A fuel cell stack, wherein the depth of the first connection groove is shallower than the depth of the first sealing groove and the third sealing groove. According to clause 9,
A fuel cell stack, wherein the depth of the second connection groove is shallower than the depth of the second sealing groove and the third sealing groove. In clause 7,
A fuel cell stack characterized in that the first separator faces the gas diffusion layer on the cathode side, and the second separator faces the gas diffusion layer on the anode side. In clause 7,
A fuel cell stack, wherein the side walls of each of the first sealing groove, second sealing groove, and third sealing groove become narrower at least in part toward the bottom, and curved portions are formed on the upper and lower edges of the side walls.

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