Fuel cell stack

Abstract

To provide a fuel cell stack with improved watertight and airtight performance. [Solution] A fuel cell stack according to one embodiment of the present invention includes a cell stack in which a plurality of unit cells are stacked in a first direction, end plates 110, 120 located at at least one of the two ends of the cell stack, enclosures 210, 220 that connect with the end plates to surround the side of the cell stack and are divided into a plurality of segments, a first gasket 310 located in a first gap between the plurality of segments, and a second gasket 320 located in a second gap between the enclosure and the end plates, wherein the end of the first gasket facing the second gasket in the first direction can be pushed into and inserted into the second gasket when the end plate and the enclosure are connected in the first direction.

Description

Technical Field

[0001] The embodiment relates to a fuel cell stack.

Background Art

[0002] A fuel cell is a power generation device that can produce electricity through a chemical reaction of a fuel substance by a catalyst, and is used in power supply devices in various fields.

[0003] The substances used as fuels are diverse, such as hydrogen, hydrocarbons, hydrocarbon compounds, etc. Among them, hydrogen reacts with oxygen to generate water, thermal energy, and electrical energy.

[0004] Generally, a fuel cell includes a unit cell composed of a membrane-electrode assembly (MEA) including an oxidation electrode (fuel electrode, hydrogen electrode, or anode) where hydrogen is oxidized, a reduction electrode (air electrode, oxygen electrode, or cathode) where oxygen is supplied and a reduction reaction occurs, and a polymer electrolyte membrane (Membrane) through which hydrogen ions are transmitted between them.

[0005] Since the output voltage of a unit cell is only 0.6V - 1V, unit cells are stacked in series to obtain a practical output, and such a stack of cells is called a stack.

[0006] Such a fuel cell stack is required to have a high level of airtight or watertight performance for various reasons such as preventing electrical energy loss due to gas outflow inside the stack and protecting the fuel cell from the external environment of the stack.

Summary of the Invention

Problems to be Solved by the Invention

[0007] The embodiment provides a fuel cell having improved airtight and watertight performance.

[0008] The technical problems that the embodiments aim to solve are not limited to those mentioned above, and other technical problems not mentioned should be clearly understood by those with ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0009] A fuel cell stack according to one embodiment of the present invention includes a cell stack in which a plurality of unit cells are stacked in a first direction, an end plate located at at least one of the two ends of the cell stack, an enclosure coupled with the end plate to surround the side of the cell stack and divided into a plurality of segments, a first gasket located in a first gap between the plurality of segments, and a second gasket located in a second gap between the enclosure and the end plate, wherein the end of the first gasket facing the second gasket in the first direction can be pushed into and inserted into the second gasket when the end plate and the enclosure are coupled in the first direction.

[0010] For example, the end plates may include a first end plate located at one of the two ends of the cell stack, and a second end plate located at the other end of the cell stack.

[0011] For example, multiple segments may include a first segment having a '┐'-shaped appearance and a second segment having a '└'-shaped appearance.

[0012] For example, the first void may be formed in a direction aligned with the first direction.

[0013] For example, at least one of the multiple segments may include a first guide groove on a surface forming a first void, to which a first gasket is guided and secured, and at least one of the enclosure and end plate may include a second guide groove on a surface forming a second void, to which a second gasket is guided and secured.

[0014] For example, the first gasket may include a body extending in a first direction and positioned within a first guide groove, and at least one projection positioned in a fixed groove adjacent to the first guide groove and projecting from the body in a direction perpendicular to the first direction.

[0015] For example, the hardness of the first gasket may be greater than the hardness of the second gasket.

[0016] For example, the ends of the first gasket may include surfaces that are inclined so that they converge towards each other as they are inserted.

[0017] For example, the first directional length of the first gasket may be greater than or equal to the first directional length of the enclosure.

[0018] A fuel cell stack according to one embodiment of the present invention includes a cell stack in which a plurality of unit cells are stacked in a first direction, an end plate disposed at at least one of the two ends of the cell stack, an enclosure coupled with the end plate to surround the side of the cell stack and divided into a plurality of segments, a first gasket disposed in a first gap formed between the plurality of segments, a second gasket disposed in a second gap formed between the enclosure and the end plate, and a reinforcing material disposed in a third gap formed between the first gasket and the second gasket, wherein when the enclosure and the end plate are coupled, the first gasket can be pushed in and inserted into the reinforcing material.

[0019] For example, the end plates may include a first end plate located at one of the two ends of the cell stack, and a second end plate located at the other end of the cell stack.

[0020] For example, multiple segments may include a first segment having a '┐'-shaped appearance and a second segment having a '└'-shaped appearance.

[0021] For example, the first void may be formed in a direction aligned with the first direction.

[0022] For example, at least one of the plurality of segments may include a first guide groove in which a first gasket is guided and seated on a surface forming a first gap, and at least one of the enclosure and the end plate may include a second guide groove in which a second gasket is guided and seated on a surface forming a second gap.

[0023] For example, the first gasket may include a main body extending in a first direction and disposed within the first guide groove, and at least one protrusion disposed in a fixing groove adjacent to the first guide groove and protruding from the main body in a direction perpendicular to the first direction.

[0024] For example, the hardness of the first gasket and the second gasket may be the same as each other, or the difference therebetween may be within a set range.

[0025] For example, the length of the first gasket in the first direction may be the same as or shorter than the length of the enclosure in the first direction.

[0026] For example, the thickness of the reinforcing member in the first direction may be longer than the length between the first gasket and the second gasket.

[0027] For example, the hardness of the reinforcing member may be lower than that of the first gasket and the second gasket.

[0028] For example, the reinforcing member may have a tensile strength of 0.5 MPa or less.

Advantages of the Invention

[0029] The fuel cell stack according to the embodiment can improve the watertight and airtight performance by sealing the interface generated between the enclosure and the end plate or the gasket.

[0030] The fuel cell stack according to this embodiment exhibits differences in performance depending on the working environment, such as temperature, or the skill of the worker. When disassembling, it can be easily handled with liquid materials that could cause damage to the stack structure, quantitatively ensuring watertight and airtight performance, and preventing structural damage during disassembly, thus preventing waste of material costs.

[0031] The effects obtained in this embodiment are not limited to those mentioned above, and any other effects not mentioned should be clearly understood by a person with ordinary skill in the art to which this invention belongs from the following description. [Brief explanation of the drawing]

[0032] [Figure 1] This is a perspective view of the coupling of a fuel cell stack according to an embodiment of the present invention. [Figure 2] This is a disassembled perspective view of a fuel cell stack according to an embodiment of the present invention. [Figure 3] This is a drawing showing the enclosure and first gasket of a fuel cell stack according to an embodiment of the present invention. [Figure 4(a)] This diagram shows the state in which the second segment and the first gasket are joined together in Figure 3. [Figure 4(b)] This is a drawing showing the first gasket according to another embodiment. [Figure 5] This is a diagram showing a fuel cell stack according to the first embodiment of the present invention, in which the first segment has been removed in the portion corresponding to area A in Figure 1. [Figure 6] This is a cross-sectional view showing a section of region B in Figure 5. [Figure 7] This is a diagram showing a fuel cell stack according to a second embodiment of the present invention, in which the first segment 210 has been removed in the portion corresponding to area A in Figure 1. [Figure 8] This is a cross-sectional view showing the area C in Figure 7. [Modes for carrying out the invention]

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly illustrate the present invention with the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been denoted by similar reference numerals.

[0034] The terms used in this application are used solely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “includes” or “having” should be understood to indicate the presence of features, figures, steps, actions, components, parts, or combinations thereof described in the specification, without prejudice to the presence or possibility of adding one or more other features, figures, steps, actions, components, parts, or combinations thereof.

[0035] The terms "...part," "...machine," and "module" used in this specification refer to a unit that processes at least one function or operation, which may be embodied in hardware, software, or a combination of hardware and software.

[0036] Terms containing ordinal numbers, such as "first" and "second," can be used to describe a variety of components, but these components are not limited by these terms. These terms can be used solely for nominal purposes to distinguish one component from others; the sequential meaning between them is understood not by the names themselves, but through the context of the corresponding descriptions.

[0037] The term "and / or" is used to include all possible combinations of the multiple items it refers to. For example, "A and / or B" means all three cases, such as "A," "B," and "A and B."

[0038] When it is mentioned that one component is "linked" or "connected" to another component, it should be understood that it is directly linked to the other component, or may be connected, but may have other components in between.

[0039] Unless otherwise specified, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be parsed to have a meaning consistent with their meaning in the context of the relevant art, and not to be parsed to an ideal or overly formal meaning unless expressly defined herein.

[0040] Hereinafter, a fuel cell stack 100 according to an embodiment will be described as follows with reference to the attached drawings.

[0041] For convenience, we will use the Cartesian coordinate system (X, Y, and Z axes) for this explanation, but it is of course possible to explain this using other coordinate systems as well. Furthermore, in the Cartesian coordinate system, the X, Y, and Z axes are orthogonal to each other, but the examples are not limited to this. That is, the X, Y, and Z axes may intersect each other.

[0042] Hereafter, the +X and -X axes will be considered the first direction, the +Y and -Y axes the second direction, and the +Z and -Z axes the third direction.

[0043] Here, the first direction may be the direction in which the stacks are arranged. The second direction may be perpendicular to the lateral direction of the first direction. The third direction may be perpendicular to the vertical direction of the first direction.

[0044] Figure 1 is a coupled perspective view of a fuel cell stack according to an embodiment of the present invention. Figure 2 is an exploded perspective view of a fuel cell stack according to an embodiment of the present invention. Figure 3 is a drawing showing the enclosures 210, 220 and the first gasket 310 of a fuel cell stack according to an embodiment of the present invention. Figure 4(a) shows the state in which the second segment 220 and the first gasket 310 of Figure 3 are coupled, and (b) shows the first gasket 310 according to another embodiment. Figure 5 is a drawing of a fuel cell stack according to a first embodiment of the present invention, showing the state in which the first segment 210 has been removed in the part corresponding to area A in Figure 1. Figure 6 is a cross-sectional view showing the cross-section of area B in Figure 5. Figure 7 is a drawing of a fuel cell stack according to a second embodiment of the present invention, showing the state in which the first segment 210 has been removed in the part corresponding to area A in Figure 1. Figure 8 is a cross-sectional view showing the cross-section of area C in Figure 7.

[0045] For the sake of explanation, the unit cell is not shown in Figures 1 to 8.

[0046] Referring to Figures 1 and 2, a fuel cell stack according to an embodiment of the present invention includes a cell stack (not shown) in which a plurality of unit cells are stacked in a first direction (X-axis direction), end plates 110, 120 positioned on both sides of the cell stack, and enclosures 210, 220 coupled with the end plates 110, 120 to surround the sides of the cell stack and protect the cell stack.

[0047] The end plates 110 and 120 may include a first end plate 110 positioned at one of the two ends of the cell stack, and a second end plate 120 positioned at the other end of the cell stack.

[0048] Enclosures 210 and 220 can be divided into two or more segments, and the drawings show a first segment 210 having a '┐' shape and a second segment 220 having a '└' shape. The shape of such segments is illustrative and not limited thereto; for example, they may have a '⊂' shape, a '|' shape, or a '⊂' shape with different lengths for the top and bottom sides. They may also be divided into three or four segments.

[0049] When divided into multiple segments, the starting point of the dividing surface may be on the first end plate 110, and the ending point may be on the second end plate 120 side. In other words, the first gap V1 may be formed in a direction parallel to the first direction.

[0050] When multiple segments constituting enclosures 210 and 220 are joined together, the joining surfaces are not completely sealed, and a first void V1 may be formed. To ensure the airtightness of the fuel cell stack, a first gasket 310 may be placed in the first void V1.

[0051] To ensure stable adhesion of the first gasket 310, at least one of the multiple segments may include a first guide groove 211 that guides the first gasket 310 to the surface forming the first gap V1.

[0052] The first guide groove 211 may be formed on one or both sides of the joint surface between the first segment 210 and the second segment that form a first gap V1. For example, the first guide groove 211 may be formed on the first segment 210, in which case the joint surface of the second segment 220 corresponding to the joint surface of the first segment 210 may be flat. Alternatively, the first guide groove 211 may be formed on the second segment 220, in which case the joint surface of the first segment 210 corresponding to the joint surface of the second segment 220 may be flat. Furthermore, the first segment 210 and the second segment 220 may be joined together and each include a first guide groove 211 that can contain the first gasket 310. The drawings illustrate an example in which both the first segment 210 and the second segment 220 include the first guide groove 211.

[0053] The first gasket 310 can be crimped within the first guide while the first segment 210 and the second segment 220 are joined, and while crimped, airtight and watertightness can be ensured between the first segment 210 and the second segment 220.

[0054] Enclosures 210 and 220, which are formed by joining multiple segments, can be joined to the first end plate 110 and the second end plate 120 in the first direction.

[0055] Similar to multiple segments, a second void V2 may be formed at the joint surface between the end plate and the enclosures 210, 220. To ensure airtightness in the second void V2, a second gasket 320 may be placed in the second void V2.

[0056] To ensure stable and secure attachment of the second gasket 320, at least one of the end plates 110, 120 and the enclosures 210, 220 may include a second guide groove 121 on the surface forming the second gap V2 to guide the second gasket 320.

[0057] The second guide groove 121 may be formed on one or both sides of the end plates 110, 120 and the enclosures 210, 220 that form a single second gap V2. For example, the second guide groove 121 may be formed on the end plate, in which case the joint surfaces of the enclosures 210, 220 corresponding to the joint surfaces of the end plates 110, 120 may be flat. Alternatively, the enclosures 210, 220 may include the second guide groove 121 on the surface that joins with the end plates 110, 120, in which case the joint surfaces of the enclosures 210, 220 corresponding to the joint surfaces of the end plates 110, 120 may be flat. Furthermore, the enclosures 210, 220 and the end plates 110, 120 may each include a second guide groove 121 that can accommodate the second gasket 320 when joined together. The drawing illustrates that the second guide groove 121 is formed only on the joint surfaces of the end plates 110 and 120.

[0058] Figure 3 is an exploded perspective view of the enclosure 210, 220, which is composed of the first segment 210 and the second segment 220, and the first gasket 310. Figure 4(a) shows the state in which the first gasket 310 is bonded to the second segment 220, and (b) shows a projection 312 according to another embodiment.

[0059] Referring to Figures 3 and 4, the first gasket 310 may include a body 311 that extends in a first direction and is positioned within the first guide groove, and at least one projection 312 that is positioned in a fixed groove 212 adjacent to the first guide groove and protrudes from the body 311 in a direction perpendicular to the first direction.

[0060] The protrusion 312 can be used to fix the main body 311 of the first gasket 310 so that it does not move in the first direction within the first guide groove 211. In the drawing, a spherical protrusion 312 is shown, but this is merely an example, and its shape is irrelevant as long as it protrudes perpendicular to the first direction. For example, the protrusion 312 may be in the form of a hemispherical projection from the side of the first gasket 310, as shown in Figure 4(b).

[0061] The first guide groove may include a fixing groove 212 having a shape corresponding to the projection 312 of the first gasket 310. The projection 312 of the first gasket 310 can be fixed in the fixing groove 212 of the first guide groove, thereby fixing the first gasket 310 so that it does not move in the first direction.

[0062] The first gasket 310 ensures airtightness and watertightness in the first gap V1 between the multiple segments constituting the enclosures 210 and 220, and the second gasket 320 ensures airtightness and watertightness in the second gap V2 between the enclosures 210 and 220 and the end plates 110 and 120.

[0063] However, a third void V3 may form at the interface between the first gasket 310 and the second gasket 320. Such a third void V3 may reduce the airtight and watertight performance of the fuel cell stack. Therefore, the present invention proposes a method for sealing the third void V3 by giving two embodiments. The above description covers the parts common to the two embodiments.

[0064] The fuel cell stack according to the first embodiment will be described below with reference to Figures 5 and 6. Figure 5 is a diagram showing the fuel cell stack according to the first embodiment of the present invention, in which the first segment 210 has been removed in the portion corresponding to area A in Figure 1. Figure 6 is a cross-sectional view showing the cross-section of area B in Figure 5.

[0065] The fuel cell stack according to the first embodiment includes a first gasket 310 and a second gasket 320 having different physical properties. These properties may be hardness, strength (tensile strength), and rigidity. As the enclosures 210, 220 and the end plates 110, 120 are coupled, the gasket with relatively stronger physical properties can fit into the gasket with relatively weaker physical properties, preventing the formation of a gap between the first gasket 310 and the second gasket 320.

[0066] Figures 5 and 6 show the case where the end of the first gasket 310 fits into the second gasket 320. For this reason, the first gasket 310 may have a higher hardness than the second gasket 320, and the length of the first gasket 310 in the first direction may be longer than the length of the enclosures 210 and 220 in the first direction.

[0067] Tests of airtight and watertight performance revealed that when double synthetic rubber (EPDM: Ethylene Propylene Diene M-Class Rubber) was used for the first gasket 310 and a silicone foam pad was used for the second gasket 320, airtight and watertight performance corresponding to IPX7 grade, as specified by the International Electrotechnical Commission (IEC) under IEC 529, was achieved. However, when EPDM was used entirely for both the first gasket 310 and the second gasket 320, IPX7 grade could not be achieved.

[0068] According to the test results, the greater the difference in mechanical strength (compressive strength / hardness) between the first gasket 310 and the second gasket 320, and the greater the elongation of the second gasket 320, the greater the reduction in the interface between the first gasket 310 and the second gasket 320.

[0069] Furthermore, the first gasket 310 is preferably made of a soft rubber material with a hardness (Shore) of 50 to 70 and a tensile strength of 5 MPa or more (for example, double synthetic rubber (EPDM: Ethylene Propylene Diene M-Class Rubber)), and the second gasket 320 is preferably made of a silicone foam pad material with a tensile strength of 0.5 MPa or less. However, it is not limited to these.

[0070] Furthermore, the higher the required watertightness and airtight pressure, the more preferable it is to select the physical properties of the first gasket 310 and the second gasket 320.

[0071] Referring to Figure 6, the X-axis length of the first gasket 310 may be longer than the X-axis length of the second gasket 320 in order for the first gasket 310 to fit over the second gasket 320 (P>0). Alternatively, with the second end plate 120 and the second segment joined, the X-axis end face position of the first gasket 310 can be positioned further in the X-axis direction than the -X-axis end position of the second gasket 320 in the portion where the first gasket 310 does not fit.

[0072] The protruding portion 312 of the first gasket 310 is coupled with the fixing groove 212 in the first guide groove 211, thereby fixing the degree to which the first gasket 310 protrudes (amount of protrusion), and supporting the end of the first gasket 310 so that the second gasket 320 can fit inside.

[0073] Furthermore, the end shape of the first gasket 310 may be pointed or angled to facilitate insertion of the second gasket 320. The end surfaces 313 of the first gasket 310 may be inclined in a direction that brings them together as they advance along the X-axis.

[0074] The first gasket 310 can penetrate the second gasket 320 due to differences in physical properties, thereby reinforcing open loops at the interfaces of two or more gaskets into closed loops. Compared to conventional liquid materials such as sealants, this does not cause structural damage during disassembly and assembly, and eliminates the need for separate curing time and filling conditions, thus offering advantages in terms of labor and material costs. Furthermore, it can ensure a consistent level of airtightness and watertightness regardless of the working environment, such as working temperature, and the worker's skill level. The strong material gasket can penetrate between the soft material gaskets, filling the uneven surface roughness interfaces between the gaskets or surrounding parts, thereby improving the airtightness and watertightness between each part.

[0075] The fuel cell stack according to the second embodiment will be described below with reference to Figures 7 and 8. Figure 7 is a diagram showing the fuel cell stack according to the second embodiment of the present invention, in which the first segment 210 has been removed in the portion corresponding to area A in Figure 1. Figure 8 is a cross-sectional view showing the cross-section of area C in Figure 7.

[0076] Unlike the first embodiment, the fuel cell stack according to the second embodiment uses a first gasket 310 and a second gasket 320 having similar physical properties (hardness, strength, etc.), but may further include a reinforcing material 400 placed between the first gasket 310 and the second gasket 320.

[0077] The first gasket 310 may have the same first-direction length as the enclosures 210 and 220, or it may be shorter than the first-direction length of the enclosures 210 and 220. If the first gasket 310 is shorter than the enclosures 210 and 220, it may form a third gap V3 between itself and the second gasket 320. A reinforcing material 400 may be placed in the third gap V3.

[0078] The reinforcing member 400 may be of a thickness sufficient to fill the empty space (third gap V3) between the first gasket 310 and the second gasket 320 during assembly. Therefore, the first-direction thickness D of the reinforcing member 400 may be greater than the distance between the first gasket 310 and the second gasket 320, i.e., the first-direction length of the third gap V3. By joining the second end plate 120 and the enclosures 210, 220 (e.g., the second segment), the reinforcing member 400 is compressed by the first gasket 310 and the second gasket 320, thereby ensuring airtightness and watertightness in the third gap V3.

[0079] Tests of airtight and watertight performance confirmed that when the first gasket 310 and the second gasket are made of double synthetic rubber (EPDM: Ethylene Propylene Diene M-Class Rubber) and a silicone foam pad is used as reinforcement, the waterproof performance meets the aforementioned IPX7 rating.

[0080] Therefore, the reinforcing material 400 may be a silicone foam pad material with a tensile strength (e.g., hardness or rigidity) of 0.5 MPa or less. However, this is merely an example and not limited to this; any material with a tensile strength weaker than that of the first gasket 310 and the second gasket 320 is sufficient.

[0081] The first gasket 310 and the second gasket 320 may be made of a soft rubber material such as double-layered synthetic rubber (EPDM) with a hardness (Shore) of 50-70 and a tensile strength of 5 MPa or more, or they may be made of the same material. This is merely an example and is not limited thereto.

[0082] The soft material reinforcing material 400 can be compressed and used to fill the interface between the first gasket 310 and the second gasket 320, thereby reinforcing open loops at two or more gasket interfaces into closed loops. Compared to liquid materials such as conventional sealants, this does not cause structural damage during decomposition and does not require separate curing time or filling conditions, thus offering advantages in terms of work and material costs. Furthermore, it can ensure the same level of airtightness and watertightness regardless of the working environment, such as working temperature, and the worker's skill level. The soft material reinforcing material 400 can fill the uneven surface roughness interface between gaskets or surrounding parts, improving the airtightness and watertightness performance between each part.

[0083] Thus, the fuel cell stack according to the embodiment of the invention proposes a method for improving the airtightness and watertightness of the stack by the difference in physical properties of different types of gaskets or by the physical reinforcing material 400.

[0084] According to embodiments of the present invention, performance deviations can be significantly reduced compared to liquid materials, and quantitative effects can be obtained. Unlike liquid materials, which require high skill levels from the worker, the ease of use of the work can be increased. Furthermore, since disassembly does not involve structural damage, work efficiency can be increased and material costs can be saved.

[0085] As mentioned above, only a few embodiments have been described, but many other forms of implementation are possible. The technical content of the embodiments described above can be combined in various forms, as long as the technologies are not incompatible with each other, and this can be embodied in new embodiments.

[0086] It will be obvious to an ordinary person that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Therefore, the above detailed description should not be interpreted restrictively in any respect, but should be considered illustrative. The scope of the invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention. [Explanation of Symbols]

[0087] 110 First End Plate 120 Second End Plate 121 Second guide groove 210 First Segment 211 First guide groove 212 Fixed groove 220 Second Segment 310 First Gasket 311 Protrusion 320 Second Gasket 400 Reinforcement material V1 1st void V2 2nd void V3 3rd cavity

Claims

1. A cell stack in which multiple unit cells are stacked in a first direction; An end plate positioned at least at one end of the two ends of the cell stack; An enclosure that connects to the end plate and surrounds the side of the cell stack, and is divided into multiple segments; A first gasket placed in the first gap between the plurality of segments; and A second gasket disposed in the second gap between the enclosure and the end plate; The end of the first gasket facing the second gasket in the first direction is A fuel cell stack in which the end plate and the enclosure are joined in the first direction, and the second gasket is pressed in and inserted.

2. The end plate mentioned above is A first end plate positioned at one of the two ends of the cell stack; and A fuel cell stack according to claim 1, further comprising: a second end plate disposed at the other end of the two sides of the cell stack.

3. The aforementioned multiple segments are A first segment having a '┐'-shaped appearance; and A fuel cell stack according to claim 1, comprising a second segment having a '└'-shaped appearance;

4. The first void is, A fuel cell stack according to claim 1, formed in a direction parallel to the first direction.

5. At least one of the aforementioned multiple segments is The surface forming the first gap includes a first guide groove into which the first gasket is guided and secured, At least one of the enclosure and the end plate is The fuel cell stack according to claim 1, further comprising a second guide groove on the surface forming the second void, which guides and secures the second gasket.

6. The first gasket is A body extending in the first direction and positioned within the first guide groove; and The fuel cell stack according to claim 5, comprising: at least one projection disposed in a fixed groove adjacent to the first guide groove and projecting from the main body in a direction perpendicular to the first direction;

7. The fuel cell stack according to claim 1, wherein the hardness of the first gasket is greater than the hardness of the second gasket.

8. The fuel cell stack according to claim 1, wherein the end of the first gasket includes surfaces that are inclined to converge toward each other as they are inserted.

9. The fuel cell stack according to claim 1, wherein the first length of the first gasket is greater than or equal to the first length of the enclosure.

10. A cell stack in which multiple unit cells are stacked in a first direction; An end plate positioned at least at one end of the two ends of the cell stack; An enclosure that connects to the end plate and surrounds the side of the cell stack, and is divided into multiple segments; A first gasket placed in the first gap formed between the plurality of segments; A second gasket disposed in the second gap formed between the enclosure and the end plate; and A reinforcing member disposed in a third gap formed between the first gasket and the second gasket; A fuel cell stack in which the first gasket is inserted by pushing the reinforcing material when the enclosure and the end plate are joined.

11. The end plate mentioned above is A first end plate positioned at one of the two ends of the cell stack; and A fuel cell stack according to claim 10, further comprising: a second end plate disposed at the other end of the two sides of the cell stack.

12. The aforementioned multiple segments are A first segment having a '┐'-shaped appearance; and A fuel cell stack according to claim 10, comprising a second segment having a '└'-shaped appearance;

13. The first void is, The fuel cell stack according to claim 10, formed in a direction parallel to the first direction.

14. At least one of the aforementioned multiple segments is The surface forming the first gap includes a first guide groove into which the first gasket is guided and secured, At least one of the enclosure and the end plate is The fuel cell stack according to claim 10, further comprising a second guide groove on the surface forming the second void, which guides and secures the second gasket.

15. The first gasket is A body extending in the first direction and positioned within the first guide groove; and The fuel cell stack according to claim 14, comprising: at least one projection disposed in a fixed groove adjacent to the first guide groove and projecting from the main body in a direction perpendicular to the first direction;

16. The hardness of the first gasket and the second gasket is, The fuel cell stack according to claim 10, wherein the components are identical to each other, or the difference between them is within a set range.

17. The length of the first gasket in the first direction is The fuel cell stack according to claim 10, wherein the length of the enclosure in the first direction is the same as or shorter than the fuel cell stack according to claim 10.

18. The fuel cell stack according to claim 10, wherein the thickness of the reinforcing material in the first direction is longer than the length between the first gasket and the second gasket.

19. The fuel cell stack according to claim 10, wherein the hardness of the reinforcing material is lower than that of the first gasket and the second gasket.

20. The fuel cell stack according to claim 10, wherein the reinforcing material has a tensile strength of 0.5 MPa or less.

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