WO2021172962A1 - Fuel cell system - Google Patents

Abstract

Disclosed is a fuel cell system. The fuel cell system comprises: a support plate; a first fuel cell stack and a second fuel cell stack which are disposed on the upper portion of the support plate so as to be spaced apart from each other; a first current collection structure which electrically connects first current collection pads of the first and second fuel cell stacks to an external circuit; and a second current collection structure which electrically connects second current collection pads of the first and second fuel cell stacks to the external circuit. The first current collection structure comprises: a first current collection unit having one end part electrically connected to the external circuit; a second current collection unit including a first upper pad connection unit and a second upper pad connection unit which are electrically connected to the first current collection pads of the first and second fuel cell stacks, respectively; and a third current collection unit which connects the first current collection unit and the second current collection unit and has a third bent part formed on one portion.

Description

fuel cell system

The present invention relates to a fuel cell system capable of generating electric power using hydrogen-containing fuel gas and oxygen-containing air.

Fuel cells generate electricity using the reaction of hydrogen and oxygen. Such a fuel cell is generally used by connecting a plurality of fuel cell stacks in which a plurality of fuel cell cells are stacked for high output.

In this case, the plurality of fuel cell stacks are electrically connected to each other through an external current collecting structure. However, when the fuel cell stacks are electrically connected using the external current collecting structure, power loss may occur depending on the performance of the external current collecting structure. For example, since the external current collecting structure is exposed to a high-temperature oxidizing atmosphere for a long time during operation of the fuel cell system, an insulating oxide may be formed on the external current collecting structure and/or the current collecting pad of the fuel cell stack, thereby generating power losses may occur.

In addition, a height difference may occur between a plurality of fuel cell stacks during a manufacturing process or an installation process. When the plurality of fuel cell stacks are electrically connected using an external current collecting structure having a rigid structure, the fuel cell stack may be damaged. It can cause many problems in the installation of the fuel cell stack, such as the need to accurately adjust the spacing of the fuel cell stack, and can cause power loss due to damage or deformation due to stress concentration. Problems such as

It is an object of the present invention to electrically connect first current collecting pads of fuel cell stacks to an external circuit using a first current collecting structure that is stretchable in vertical and horizontal directions, so that an installation process of the fuel cell stack can be easily performed. Rather, it is to provide a fuel cell system capable of preventing power loss due to damage to current collecting pads or current collecting structures of fuel cell stacks.

A fuel cell system according to an embodiment of the present invention includes a support plate; a first fuel cell stack and a second fuel cell stack disposed on the support plate to be spaced apart from each other; a first current collecting structure electrically connecting the first current collecting pads of the first and second fuel cell stacks to an external circuit; and a second current collecting structure electrically connecting the second current collecting pads of the first and second fuel cell stacks to an external circuit, in this case, the first current collecting structure has one end electrically connected to the external circuit a first current collector connected; a second current collector having a first upper pad connecting portion and a second upper pad connecting portion electrically connected to the first current collecting pads of the first and second fuel cell stacks, respectively; and a third current collector connecting the first current collecting part and the second current collecting part and having a third bent part in a portion thereof.

In an embodiment, the first current collector and the second current collector may extend along first and second directions parallel to and intersecting with an upper surface of the support plate, respectively, and the second current collecting part may extend along a third direction intersecting the first and second directions, and the third bent part may be bent in a zigzag form based on a plurality of wrinkle lines parallel to the first direction and spaced apart from each other. .

In one embodiment, the second current collector, having a plate structure parallel to the upper surface of the support plate, the third current collector is a first central portion connected to the side; the first upper pad connecting portion extending from the first end of the first central portion in the first direction and electrically connected to the first current collecting pad of the first fuel cell stack; and a second upper pad connecting part extending in the first direction from a second end of the first central portion opposite to the first end and electrically connected to the first current collecting pad of the second fuel cell stack. can

In an embodiment, a first bent part bent based on one or more bending lines parallel to the second direction may be formed on a portion of the first upper pad connection part.

In an embodiment, a second bent part bent based on one or more bending lines parallel to the second direction may be formed on a portion of the second upper pad connection part.

In an embodiment, the second current collecting structure may include: a fourth current collecting part having one end electrically connected to the external circuit; and a fifth current collector having a first lower pad connecting portion and a second lower pad connecting portion electrically connected to the second current collecting pads of the first and second fuel cell stacks, respectively.

In one embodiment, the fifth current collector has a plate structure parallel to the upper surface of the support plate, the fourth current collector is connected to the second central portion to the side; the first lower pad connecting portion extending from the first end of the second central portion in the first direction and electrically connected to the second current collecting pad of the first fuel cell stack; and a second lower pad connecting portion extending in the first direction from a second end of the second central portion opposite to the first end and electrically connected to a second current collecting pad of the second fuel cell stack. can

In an embodiment, the first current collector may be disposed on the fourth current collector, and in this case, the fuel cell system may provide a space between the support plate, the fourth current collector, and the first current collector. An insulating coupling member for insulating and fixing the first and second current collecting structures to the support plate may be further included.

In an embodiment, the insulating coupling member may include: a first insulating spacer member disposed on an upper surface of the support plate; a second insulating spacer member disposed on the first insulating facer member with the fourth current collector interposed therebetween; and a third insulating spacer member disposed on the second insulating spacer member with the first current collector interposed therebetween.

In an embodiment, the insulating coupling member may further include a coupling member passing through the first to third insulating spacer members and coupling them to the support plate.

In an embodiment, guide protrusions may be formed on upper surfaces of the first and second insulating spacer members, and guide grooves into which the guide protrusions are inserted may be formed on lower surfaces of the second and third insulating spacer members. have.

In one embodiment, in order to prevent the fourth current collector and the first current collecting part from being short-circuited by the fastening member, the guide protrusion is disposed on the fifth current collecting part and the first current collecting part rather than the fastening member. may be formed closer together.

In an embodiment, protrusions are formed on a surface of at least one of the first and second upper pad connection parts by sanding, and a surface having the protrusions is formed with a conductive paste to correspond to one of the first current collecting pads through a conductive paste. can be connected to

In an embodiment, an insulating ceramic coating film may be formed on the surface of the first current collecting structure.

According to the fuel cell system of the present invention, since the first current collecting pads of the fuel cell stacks are electrically connected to an external circuit using the first current collecting structure that is stretchable in the vertical and horizontal directions, the installation process of the fuel cell stack is easily performed. In addition, it is possible to prevent power loss due to damage to the current collecting pads or the current collecting structure of the fuel cell stacks.

In addition, by increasing the surface area of the contact surface of the current collecting structure or the current collecting pad through sanding or the like, and then bonding it through a conductive paste, it is possible to more stably prevent power generated in the fuel cell stack from being lost.

1 is a view for explaining a fuel cell system according to an embodiment of the present invention.

2A and 2B are cross-sectional views and plan views illustrating a second current collecting unit of the first current collecting structure shown in FIG. 1 .

3A and 3B are a cross-sectional view and a plan view illustrating a third current collecting unit of the first current collecting structure shown in FIG. 1 .

4A and 4B are a cross-sectional view and a plan view illustrating a fifth current collecting unit of the second current collecting structure shown in FIG. 1 .

5 is a cross-sectional view illustrating an insulating coupling member applied to a fuel cell system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The terms used in the present application are used only to describe specific embodiments and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, step, operation, component, part, or combination thereof described in the specification is present, and includes one or more other features or steps. , it should be understood that it does not preclude the possibility of the existence or addition of , operation, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

1 is a view for explaining a fuel cell system according to an embodiment of the present invention, FIGS. 2A and 2B are cross-sectional and plan views for explaining a second current collecting unit of the first current collecting structure shown in FIG. 1, 3A and 3B are cross-sectional and plan views illustrating a third current collecting unit of the first current collecting structure shown in FIG. 1 , and FIGS. 4A and 4B are a fifth current collecting unit of the second current collecting structure shown in FIG. 1 . It is a cross-sectional view and a plan view for explanation.

1, 2A, 2B, 3A, 3B, 4A and 4B, the fuel cell system 1000 according to the embodiment of the present invention includes a support plate 1100, a plurality of fuel cell stacks ( 1210 , 1220 , 1230 , and 1240 , a first current collecting structure 1300 , and a second current collecting structure 1400 may be included.

The support plate 1100 may be disposed under the plurality of fuel cell stacks 1210 , 1220 , 1230 , and 1240 to support them. As long as the plurality of fuel cell stacks 1210 , 1220 , 1230 , and 1240 can be stably supported, the shape and structure of the support plate 1100 are not particularly limited.

The plurality of fuel cell stacks 1210 , 1220 , 1230 , and 1240 may be disposed on the support plate 1100 . Each of the fuel cell stacks 1210 , 1220 , 1230 , and 1240 may include an upper end plate and a lower end plate spaced apart from each other, and a single cell stack disposed therebetween and in which a plurality of fuel cell unit cells are stacked. can

The unit cell stack may include a plurality of stacked unit cells and a plurality of separators respectively disposed between the unit cells to connect the unit cells in series.

In addition, each of the unit cells may have a structure including an electrolyte layer and a first electrode and a second electrode respectively disposed on both sides thereof, wherein one of the first electrode and the second electrode is an anode electrode and the other one is an anode electrode may be a cathode electrode. The unit cell may be one flat type unit cell selected from a solid oxide fuel cell (SOFC), a polymer electrolyte fuel cell (PEMFC), a molten carbonate fuel cell (MCFC), and the like.

The separator may be formed of an electrically conductive material and disposed between two adjacent unit cells to electrically connect the first electrode of the lower unit cell and the second electrode of the upper unit cell. A plurality of unit cells positioned in one fuel cell stack may be connected in series by the separation plates.

The upper end plate and the lower end plate may be respectively disposed on the upper and lower portions of the unit cell stack, and may be formed of an electrically conductive material, for example, a metal material. The upper end plate may be electrically connected to a first electrode of an uppermost unit cell of the unit cell stack, and may include a first current collecting pad exposed to the outside of the fuel cell stack. In addition, the lower end plate may be electrically connected to a second electrode of a lowermost unit cell of the unit cell stack, and may include a second current collecting pad exposed to the outside of the fuel cell stack. In one embodiment, in each fuel cell stack, the first current collecting pad and the second current collecting pad may protrude in the same direction to face each other while being spaced apart from each other.

In one embodiment, a first fuel cell stack 1210 , a second fuel cell stack 1220 , and a third When the fuel cell stack 1230 and the fourth fuel cell stack 1240 are included, the first current collecting pad and the second current collecting pad of the first fuel cell stack 1210 are directed toward the fourth fuel cell stack 1240 . The first current collecting pad and the second current collecting pad of the second fuel cell stack 1220 may be formed to protrude toward the third fuel cell stack 1230 , and the third fuel The first and second current collecting pads of the cell stack 1230 may be formed to protrude toward the second fuel cell stack 1220 , and the first and second current collecting pads of the fourth fuel cell stack 1240 may be formed. The second current collecting pad may be formed to protrude toward the first fuel cell stack 1210 .

The first current collecting structure 1300 may electrically connect the first current collecting pads of the fuel cell stacks 1210, 1220, 1230, 1240 to an external circuit (not shown) such as a load or a power converter. have.

In an embodiment, the first current collecting structure 1300 may be integrally formed by processing a metal plate having conductivity. In an embodiment, the first current collecting structure 1300 includes a first current collecting part 1310 having one end electrically connected to the external circuit, and a first of the fuel cell stacks 1210 , 1220 , 1230 , 1240 . A second current collecting unit 1320 having a plurality of upper pad connection units electrically connected to the current collecting pads, respectively, and a third current collecting unit connecting the first current collecting unit 1310 and the second current collecting unit 1320 ( 1330) may be included.

The first current collector 1310 may be disposed adjacent to the upper surface of the support plate 1100 , may extend in parallel to the upper surface of the support plate 1100 , and may have a preset width and thickness. . A first end of the first current collector 1310 may be electrically connected to the external circuit. For example, the first current collector 1310 is disposed parallel to the upper surface of the support plate 1100 , and has a width in the first direction (X) parallel to the upper surface of the support plate 1100 . It may have a rectangular plate structure parallel to the upper surface of the support plate 1100 and having a length in a second direction (Y) orthogonal to the first direction (X).

The second current collector 1320 may extend in a direction crossing the first current collector 1310 to have a length in the first direction (X) and a width in the second direction (Y). For example, the second current collector 1320 may include a first central portion 1321 , a first upper pad connecting portion 1322 , and a second upper pad connecting portion 1323 .

The first central portion 1321 may have a plate structure parallel to the upper surface of the support plate 1100 . For example, the first central portion 1321 may have a rectangular plate structure having a length (X) in the first direction and a width in the second direction (Y).

The first upper pad connecting portion 1322 may extend in the opposite direction to the first central portion 1321 from a first end that is one end of the first central portion 1321 in the first direction (X), The second upper pad connection part 1323 may extend from a second end of the first center 1321 opposite to the first end in a direction opposite to the first center 1321 . On the other hand, each of the first upper pad connecting portion 1322 and the second upper pad connecting portion 1323 includes a first bent portion 1322a forming a wrinkle for imparting elasticity in the first direction (X) to a portion thereof, and Each of the second bent portions 1323a may be provided. The first and second bent portions 1322a and 1323a may be bent based on one or more bending lines parallel to the second direction (Y).

The third current collector 1330 includes a second end perpendicular to the first and second directions (X, Y) from a second end of the first current collector 1310 opposite to a first end electrically connected to an external circuit. It may extend in the three directions (Z) and may be connected to the side surface of the first central portion 1321 of the second current collector 1320 , may have the same width and thickness as the first current collector 1310 , and may have a portion A third bent part 1330a for forming wrinkles for imparting elasticity in the third direction (Z) may be provided. In an embodiment, the third bent part 1330a may be bent in a zigzag shape based on a plurality of wrinkle lines parallel to the first direction X. The third current collector 1330 may be extended or contracted in the third direction Z by the third bent part 1330a.

The second current collecting structure 1400 may electrically connect the second current collecting pads of the fuel cell stacks 1210 , 1220 , 1230 , and 1240 to the external circuit (not shown).

In an embodiment, the second current collecting structure 1400 may be integrally formed by processing a metal plate having conductivity. In an embodiment, the second current collecting structure 1400 includes a fourth current collecting unit 1410 having one end electrically connected to the external circuit and a second of the fuel cell stacks 1210 , 1220 , 1230 , 1240 . It may include a fifth current collector 1420 having a plurality of lower pad connection parts electrically connected to the current collecting pads, respectively.

The fourth current collector 1410 may be disposed adjacent to the upper surface of the support plate 1100, may extend parallel to the upper surface of the support plate 1100, and may have a preset width and thickness. , a first end may be electrically connected to the external circuit. For example, the fourth current collector 1410 is disposed parallel to the upper surface of the support plate 1100 and is a rectangle having widths and lengths in the first direction (X) and the second direction (Y). It may have a plate structure.

The fifth current collector 1420 may have a length in the first direction (X) and a width in the second direction (Y). For example, the fifth current collector 1420 may include a second central portion 1421 , a first lower pad connecting portion 1422 , and a second lower pad connecting portion 1423 .

The second central portion 1421 may have a plate structure parallel to the upper surface of the support plate 1100 , and includes a portion of the fourth current collector 1410 opposite to the first end electrically connected to an external circuit. It may be connected to the second end. For example, the second central portion 1421 may have a rectangular plate structure having a length X in the first direction and a width in the second direction Y, and the fourth current collector 1410 may have a rectangular plate structure. ) of the second end may be connected to the side of the second central portion 1421 .

The first lower pad connection part 1422 extends from a first end that is one end of the second center 1421 in the first direction X in a direction opposite to the second center 1421 , The second lower pad connection part 1423 may extend from a second end of the second center 1421 opposite to the first end in a direction opposite to the second center 1421 . On the other hand, each of the first lower pad connecting portion 1422 and the second lower pad connecting portion 1423 includes a fourth bent portion 1422a forming a wrinkle for imparting elasticity in the first direction (X) to a portion thereof; A fifth bent portion 1423a may be provided, respectively. The fourth and fifth bent portions 1422a and 1423a may be bent based on one or more bending lines parallel to the second direction (Y).

In one embodiment, as described above, the first fuel cell stack 1210 and the second fuel cell stack in which the plurality of fuel cell stacks 1210 , 1220 , 1230 , and 1240 are arranged in a clockwise direction in a quadrangular shape 1220 , the third fuel cell stack 1230 and the fourth fuel cell stack 1240 are included, the first upper pad connecting portion 1322 of the first current collecting structure 1300 and the second current collecting structure ( The first lower pad connecting portion 1422 of 1400 may be electrically connected to the first and second current collecting pads of the first and fourth fuel cell stacks 1210 and 1240, respectively, and the first current collecting The second upper pad connecting portion 1323 of the structure 1300 and the second lower pad connecting portion 1423 of the second current collecting structure 1400 are the first current collecting units of the second and third fuel cell stacks 1220 and 1230 . Each of the pads and the second current collecting pads may be electrically connected to each other.

In one embodiment, at least one of the first and second upper pad connecting portions 1322 and 1323 and the first and second lower pad connecting portions 1422 and 1423 to reduce contact resistance with a corresponding current collecting pad. Surface treatment for increasing the surface area, such as sanding treatment, may be performed, and may be adhered to the corresponding current collecting pad and conductive paste.

In one embodiment, in order to prevent the first and second current collecting structures 1300 and 1400 from being oxidized and to improve insulation from other components, the surfaces of the first and second current collecting structures 1300 and 1400 are may be coated with an insulating ceramic material.

5 is a cross-sectional view illustrating an insulating coupling member applied to a fuel cell system according to an embodiment of the present invention.

As shown in FIG. 5 , the first current collecting unit 1310 of the first current collecting structure 1300 may be disposed on the fourth current collecting unit 1410 of the second current collecting structure 1400 , in this case , the fuel cell system 1000 according to an embodiment of the present invention insulates between the support plate 1100 , the fourth current collector 1410 , and the first current collector 1310 from each other, and the first and second An insulating coupling member 1500 for fixing the current collecting structures 1300 and 1400 to the support plate 1100 may be further included.

The insulating coupling member 1500 includes the first insulating spacer member 1510 disposed on the upper surface of the support plate 1100 and the fourth current collecting part 1410 interposed therebetween by the first insulating facer member ( 1510) a second insulating spacer member 1520 disposed thereon and a third insulating spacer member 1530 disposed on the second insulating spacer member 1520 with the first current collecting part 1310 interposed therebetween; can do. In an embodiment, the first to third insulating spacer members 1510 , 1520 , and 1530 may have a plate structure having a constant thickness.

In an embodiment, the first to third insulating spacer members 1510 , 1520 , and 1530 may be coupled to the support plate 1100 through a fastening member 1530 such as a bolt passing through them. In this case, the fourth current collector 1410 and the first current collector 1310 are disposed between the first and second insulating spacer members 1510 and 1520 and between the second and third insulating spacer members 1520 and 1530 . ) can be fixed under pressure.

In an embodiment, the fourth current collector 1410 or the first current collector 1310 is disposed between the first and second insulating spacer members 1510 and 1520 or between the second and third insulating spacer members ( By moving between 1520 and 1530 and in contact with the fastening member 1530 formed of a metal material, the fourth current collecting part 1410 and the first current collecting part 1310 are short-circuited by the fastening member 1530 To prevent this, guide protrusions 1511 and 1521 may be formed on the upper surface of the first insulating spacer member 1510 and the upper surface of the second insulating spacer member 1520 , and the second insulating spacer member Guide grooves into which the guide protrusions 1511 and 1521 are inserted may be formed on a lower surface of the 1520 and a lower surface of the third insulating spacer member 1530 . In this case, in order to prevent the fourth current collector 1410 and the first current collector 1310 from being short-circuited by the fastening member 1530 , the guide protrusions 1511 and 1521 are formed by the fastening member 1530 . ) may be formed closer to the fourth current collecting unit 1410 and the first current collecting unit 1310 than the first.

According to the fuel cell system of the present invention, since the first current collecting pads of the fuel cell stacks are electrically connected to an external circuit using the first current collecting structure that is stretchable in the vertical and horizontal directions, the installation process of the fuel cell stack is easily performed. In addition, it is possible to prevent power loss due to damage to the current collecting pads or the current collecting structure of the fuel cell stacks.

In addition, by increasing the surface area of the contact surface of the current collecting structure or the current collecting pad through sanding or the like, and then bonding it through a conductive paste, it is possible to more stably prevent power generated in the fuel cell stack from being lost.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can.

[Explanation of code]

1100: fuel cell system 1100: support plate

1210, 1220, 1230, 1240: fuel cell stack

1300: first current collecting structure 1310: first current collecting unit

1320: 2 current collector 1330: 3 current collector

1400: second current collecting structure 1410: fourth current collecting unit

1420: fifth current collector 1500: insulating coupling member

Claims (14)

support plate; a first fuel cell stack and a second fuel cell stack disposed on the support plate to be spaced apart from each other; a first current collecting structure electrically connecting the first current collecting pads of the first and second fuel cell stacks to an external circuit; and a second current collecting structure electrically connecting the second current collecting pads of the first and second fuel cell stacks to an external circuit; The first current collecting structure, a first current collector having one end electrically connected to the external circuit; a second current collector having a first upper pad connecting portion and a second upper pad connecting portion electrically connected to the first current collecting pads of the first and second fuel cell stacks, respectively; and and a third current collector connecting the first current collecting part and the second current collecting part and having a third bent part in a portion thereof. According to claim 1, The first current collector and the second current collector extend along first and second directions parallel to the upper surface of the support plate and intersecting each other, respectively; The second current collector extends along a third direction intersecting the first and second directions, The fuel cell system, characterized in that the third bent portion is bent in a zigzag form based on a plurality of wrinkle lines parallel to the first direction and spaced apart from each other. 3. The method of claim 2, The second current collector, a first central portion having a plate structure parallel to the upper surface of the support plate and connected to a side surface of the third current collector; the first upper pad connecting portion extending from the first end of the first central portion in the first direction and electrically connected to the first current collecting pad of the first fuel cell stack; and and a second upper pad connecting part extending in the first direction from a second end of the first central portion opposite to the first end and electrically connected to the first current collecting pad of the second fuel cell stack. Characterized in the fuel cell system. According to claim 1, The fuel cell system, characterized in that a first bent portion bent based on one or more bending lines parallel to the second direction is formed on a portion of the first upper pad connection portion. 5. The method of claim 4, The fuel cell system, characterized in that a second bent portion bent based on one or more bending lines parallel to the second direction is formed on a portion of the second upper pad connection portion. 3. The method of claim 2, The second current collecting structure, a fourth current collector having one end electrically connected to the external circuit; and and a fifth current collector having a first lower pad connection part and a second lower pad connection part electrically connected to the second current collecting pads of the first and second fuel cell stacks, respectively. . 7. The method of claim 6, The fifth current collector, a second central portion having a plate structure parallel to the upper surface of the support plate and connected to a side surface of the fourth current collector; the first lower pad connecting portion extending from the first end of the second central portion in the first direction and electrically connected to the second current collecting pad of the first fuel cell stack; and and a second lower pad connecting portion extending in the first direction from a second end of the second central portion opposite to the first end and electrically connected to a second current collecting pad of the second fuel cell stack. Characterized in the fuel cell system. 7. The method of claim 6, The first current collector is disposed on the fourth current collector, The fuel cell system further includes an insulating coupling member that insulates the support plate, the fourth current collector, and the first current collector from each other and fixes the first and second current collector structures to the support plate. which is a fuel cell system. 9. The method of claim 8, The insulating coupling member, a first insulating spacer member disposed on an upper surface of the support plate; a second insulating spacer member disposed on the first insulating facer member with the fourth current collector interposed therebetween; and and a third insulating spacer member disposed on the second insulating spacer member with the first current collector interposed therebetween. 10. The method of claim 9, The insulating coupling member may further include a coupling member passing through the first to third insulating spacer members and coupling them to the support plate. 11. The method of claim 10, Guide protrusions are formed on upper surfaces of the first and second insulating spacer members; The fuel cell system, characterized in that guide grooves into which the guide protrusions are inserted are formed on lower surfaces of the second and third insulating spacer members. 12. The method of claim 11, In order to prevent the fourth current collecting part and the first current collecting part from being short-circuited by the fastening member, the guide protrusion is formed closer to the fifth current collecting part and the first current collecting part than the fastening member. which is a fuel cell system. According to claim 1, Protrusions are formed on the surface of at least one of the first and second upper pad connection parts by sanding, The fuel cell system, characterized in that the surface having the protrusions is connected to a corresponding one of the first current collecting pads through a conductive paste. According to claim 1, The fuel cell system, characterized in that an insulating ceramic coating film is formed on the surface of the first current collecting structure.

Images