Gas dispersion means for fuel cells or electrolytic equipment, cell stacks and fuel cell systems including the same.

Abstract

The present invention provides a gas dispersion means that prevents fuel and air from concentrating only in specific areas of the cell structure, and reduces heat loss due to heat concentration in the cell, separator plate, and stack by using a uniform reaction, as well as a fuel cell and fuel cell system including the same. [Solution] The gas dispersion means includes a contact plate 100 in which the edge of the cell structure is in close contact with at least a part of the body, with a plurality of gas passages formed in the first side rim 110 and the second side rim 120 respectively, and a plurality of parallel slits formed in the body 130, and a gas flow plate 200 in which the body is in close contact with the opposite side of the surface in which the cell structure is in contact, with a gas inlet and gas passage formed in the third side rim 210 which has a shape corresponding to the first side rim, and a gas outlet and gas passage formed in the fourth side rim 220 which has a shape corresponding to the second side rim, and with an inlet channel, a horizontal channel, a unit diffusion channel and an outlet channel formed in the body.

Description

Technical Field

[0001] The present invention relates to a gas dispersion means for a fuel cell or an electrolysis device, a cell stack including the same, and a fuel cell system. More specifically, by uniformly dispersing the gas flow throughout the cell, it is possible to prevent the gas from concentrating only in a specific area of the cell structure, avoid heat concentration in the cell structure and the separator plate by a uniform electrochemical reaction, and thereby reduce damage. The present invention relates to a gas dispersion means, a cell stack including the same, and a fuel cell system.

Background Art

[0002] A solid oxide fuel cell (SOFC) is a fuel cell that uses a solid ceramic as an electrolyte and operates at a high temperature of 700°C to 1000°C. Compared with other types of fuel cells, it has the advantages of higher power generation efficiency and the ability to utilize high-quality arrays.

[0003] Generally, a solid oxide fuel cell uses a cell stack in which a plurality of cell packages are stacked. In each cell package, an air electrode and a fuel electrode are respectively arranged on both sides with respect to the electrolyte.

[0004] When oxygen and hydrogen are respectively supplied to the air electrode and the fuel electrode of the cell package, oxygen ions are generated by the reduction reaction of oxygen at the air electrode, and the generated oxygen ions move to the fuel electrode through the electrolyte membrane.

[0005] At the fuel electrode, the oxygen ions that have moved from the air electrode react with the hydrogen supplied to the fuel electrode to generate water. At this time, electrons flow through the external circuit in the process of the electrons generated at the fuel electrode moving to the air electrode, and electricity is produced using such a flow of electrons.

[0006] A solid oxide fuel cell cell package includes a cell structure comprising an air electrode, a fuel electrode, and an electrolyte; a separator plate for guiding oxygen gas (or air) or hydrogen gas to the air electrode or fuel electrode of the cell structure; a sealing material for sealing the space between the cell structure and the separator plate; and components such as a current collector for transmitting the produced electricity to the outside.

[0007] In this case, the separation plate of the cell package may have microchannels formed on at least one surface. The microchannels on the separation plate are responsible for guiding the reaction gases, hydrogen and oxygen, to be uniformly supplied to each reaction surface of the cell structure.

[0008] If the flow in the microchannels formed in the separation plate is not smooth, and the gas concentrates in a specific area of ​​either the fuel electrode or the air electrode, a reaction will occur only in that specific area. Therefore, if heat is concentrated in either area, it is detrimental to long-term operation, and the overall electricity production efficiency will inevitably decrease.

[0009] In particular, conventionally used separators often have microchannels formed in a simple straight line, which tends to result in uneven pressure distribution from the separator's inlet through the intermediate section to the outlet. This leads to temperature differences in the cell structure due to differences in reaction between the fluid-filled and non-fluid-filled regions, ultimately resulting in temperature differences between the separator and the stack. Furthermore, this heat trapping caused by temperature deviations not only damages the aforementioned components but also makes it impossible to achieve optimal efficiency in the cell package or cell stack due to regional variations in reaction rates.

[0010] To overcome the morphological limitations of conventional separator plates, Korean Published Patent No. 10-2010-0051257 (hereinafter referred to as "Patent Document 1") was proposed. Patent Document 1 discloses a fuel cell separator plate with a repeating zigzag structure pattern.

[0011] However, when microchannels are formed in a zigzag structure, the gas must change direction multiple times as it is supplied to the cell structure, and resistance to the flow increases at the points where the direction changes. As a result, pressure losses occur in some places, and the fluid flow can become slower towards the outlet compared to the inlet. This kind of non-uniform fluid flow ultimately hinders maximizing power generation efficiency. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Korean Published Patent Publication No. 10-2010-0051257 (May 17, 2010) [Overview of the project] [Problems that the invention aims to solve]

[0013] The problem that the present invention aims to solve is to provide a gas dispersion means that prevents fuel and air from concentrating only in specific areas of the cell structure, and that can reduce heat loss due to heat concentration in the cell, separator plate, and stack by using a uniform reaction, as well as a fuel cell and fuel cell system including the same. [Means for solving the problem]

[0014] As one means of solving the problem, the present invention provides a first side rim and a second side rim, each having a plurality of gas through openings, and a body having a plurality of slits that are parallel to each other in the direction from the first side rim to the second side rim, and a contact plate in which the edge of the cell structure is in airtight contact with at least a part of the body,

[0015] As a first embodiment, a gas distributing means (GDM) for a fuel cell or electrolytic device is provided, which includes a gas flow plate in which a comb-shaped inlet flow pass communicating with the gas inlet, a horizontal flow pass consisting of horizontal grooves, a unit vertical flow pass consisting of vertical grooves, and a comb-shaped outlet flow pass communicating with the gas outlet are formed on the body.

[0016] Furthermore, the present invention also provides a cell stack for a fuel cell or electrolytic device in which a plurality of cell packages are stacked, each including: a gas dispersion means identical to that of the first embodiment and provided on the fuel electrode side (anode side GDM); a gas dispersion means identical to that of the first embodiment and provided on the air electrode side (cathode side GDM); a cell structure in which the fuel electrode is in close contact with the contact plate of the fuel electrode side gas dispersion means and the air electrode is in close contact with the contact plate of the air electrode side gas dispersion means; a sealant disposed between the fuel electrode side gas dispersion means and the air electrode side gas dispersion means to prevent gas leakage; and a separation plate that seals the externally exposed surface of the gas flow plate provided on the fuel electrode side gas dispersion means or the air electrode side gas dispersion means.

[0017] Finally, the present invention provides a fuel cell system or electrolytic equipment system including the cell stack of the second embodiment as a third embodiment.

[0018] In the first to third embodiments described above, the body of the contact plate may be provided with multiple unit slits, each consisting of a plurality of slits, arranged in a multi-stage configuration.

[0019] In the first to third embodiments described above, the height of the unit slit adjacent to the first and second side rims may be formed to be higher than that of other unit slits not adjacent to the first and second side rims.

[0020] In the first to third embodiments described above, the unit vertical flow path of the gas flow plate may be positioned on the contact plate at a location corresponding to the boundary line between the unit slits, and the horizontal flow path of the gas flow plate may be positioned at a location corresponding to the horizontal line between the upper and lower ends of the unit slits.

[0021] In the first to third embodiments described above, the horizontal flow path and the unit vertical flow path in the gas flow plate may be alternately and repeatedly arranged without communicating with each other.

[0022] In the first to third embodiments described above, when the gas dispersion means is on the fuel electrode side, a first fuel passage and a first air passage are formed on the first side rim of the contact plate, a second fuel passage is formed on the second side rim of the contact plate at a position diagonally opposite to the first fuel passage, and a second air passage is formed at a position diagonally opposite to the first air passage. On the third side rim of the gas flow plate, a fuel inlet and a third air passage are formed at positions corresponding to the first fuel passage and the first air passage, respectively, and a fuel outlet and a fourth air passage are formed at positions corresponding to the second fuel passage and the second air passage.

[0023] In the second and third embodiments described above, the fuel may be injected into the gas inlet of the fuel electrode side gas dispersion means and then discharged from the gas outlet of the fuel electrode side gas dispersion means, and the air may be injected into the gas inlet of the air electrode side gas dispersion means and then discharged from the gas outlet of the air electrode side gas dispersion means.

Advantages of the Invention

[0024] According to the embodiments of the present invention, it is possible to prevent fuel and air from concentrating only in specific areas of the cell structure, and to generate a uniform reaction, thereby reducing heat loss of the cell, separator plate, and stack due to heat concentration, and increasing the electric production efficiency.

Brief Description of the Drawings

[0025] [Figure 1] It is a configuration diagram of the fuel electrode side (or air electrode side) of the gas dispersion means according to an embodiment of the present invention. [Figure 2] It is a configuration diagram of a cell package including the gas dispersion means according to an embodiment of the present invention. [Figure 3] It is a detailed configuration diagram of the gas flow plate and contact plate constituting the gas dispersion means according to an embodiment of the present invention. [Figure 4] It is a detailed configuration diagram for explaining the gas dispersion principle of the gas dispersion means according to an embodiment of the present invention. [Figure 5] It is a configuration diagram of the contact plate in the gas dispersion means according to another embodiment of the present invention. [Figure 6] It is a cutaway view of a cell package according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0026] Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings. However, this is not intended to limit the present invention to any specific embodiment, and all transformations, equivalents, and substitutions including the technical idea of the present invention should be understood to be included in the scope of the present invention.

[0027] In this specification, singular expressions include plural expressions unless otherwise specified in the context.

[0028] In this specification, when a configuration is described as "have" or "comprise" a subconfiguration, unless otherwise specified, it means that other configurations may be included, rather than being excluded.

[0029] Figure 1 is a diagram showing the configuration of the fuel electrode side (or air electrode side) of a gas dispersion means according to one embodiment of the present invention.

[0030] One embodiment of the gas dispersion means includes a contact plate 100 and a gas flow plate 200. The gas dispersion means of one embodiment refers to either a fuel electrode-side gas dispersion means that is in close contact with the fuel electrode of the cell structure 300 or an air electrode-side gas dispersion means that is in close contact with the air electrode of the cell structure 300.

[0031] Figure 2 is a diagram showing the configuration of a cell package including the gas dispersion means according to the embodiment of Figure 1.

[0032] As shown in Figure 2, one embodiment of the cell package 10 comprises a fuel electrode side gas dispersion means, a cell structure 300, a sealant 400, an air electrode side gas dispersion means, and partition plates 500, 500'.

[0033] As shown in Figure 2, the fuel electrode side gas dispersion means and the air electrode side gas dispersion means are arranged so as to mirror each other with respect to the central cell structure 300, except that the gas inlets 211, 211' and gas outlets 221, 221' of each gas dispersion means are located at points that are opposite each other with respect to the vertical central axis. In other words, the fuel electrode side gas dispersion means and the air electrode side gas dispersion means have the same technical configuration except for the positions of the gas inlets 211, 211' and gas outlets 221, 221'.

[0034] The gas dispersion means will be described in detail later with reference to Figures 3 and 4.

[0035] The cell structure 300 is a reaction unit consisting of an air electrode, an electrolyte, and a fuel electrode, and is divided into a reaction region 301 in the center and a non-reaction region 302 at the edge.

[0036] As shown in Figure 2, the contact plate 100 of the fuel electrode side gas dispersion means is in close contact with the fuel electrode of the cell structure 300, and the contact plate 100' of the air electrode side gas dispersion means is in close contact with the air electrode of the cell structure 300.

[0037] The sealant 400 is placed between the fuel electrode side gas dispersion means and the air electrode side gas dispersion means to prevent gas leakage.

[0038] In other words, the sealant 400 keeps the cell structure 300 airtight so that the fuel and oxygen are not pre-mixed before passing through the cell structure 300. It can also act as an insulator to prevent the electricity generated in the cell structure 300 from leaking into unwanted paths.

[0039] Specifically, the sealant 400 includes a body with a cell structure mounting opening that is the same as or slightly larger than the outer diameter of the cell structure 300, and a fifth side rim and a sixth side rim that correspond to the first side rim 110 and the second side rim 120 of the contact plate 100 of the gas dispersion means. Therefore, the fifth side rim and the sixth side rim have the same shape and position as the various gas passage openings formed in the first side rim 110 and the second side rim 120 of the contact plate 100. Preferably, the sealant 400 is formed with the same or substantially the same thickness as the cell structure 300.

[0040] The partition plates 500, 500' seal the externally exposed surfaces of the gas flow plates 200, 200' provided in the fuel electrode side gas dispersion means or the air electrode side gas dispersion means.

[0041] Specifically, the partition plates 500, 500' include a plate-shaped body having a uniform thickness and a flat surface, and a seventh side rim and an eighth side rim having a shape corresponding to the first side rim 110 and the second side rim 120 of the contact plate 100 of the gas dispersion means. Therefore, the seventh and eighth side rims have the same shape and position of various gas passages and alignment holes formed in the first side rim 110 and the second side rim 120 of the contact plate 100.

[0042] On the other hand, the partition plate 500, the fuel electrode side gas dispersion means, the cell structure 300, the sealant 400, the air electrode side gas dispersion means, and the partition plate 500' are sequentially stacked and tightly packed together to form a single cell package 10.

[0043] If multiple cell packages are stacked to form a cell stack, the cell package placed at the outermost edge of the cell stack may be the cell package 10 with the two partition plates described above, but the cell packages placed in the middle of the cell stack may be provided with only one partition plate.

[0044] In other words, a single cell 10 may be used in the fuel cell system, or a cell stack in which multiple single cell packages 10 are stacked may be used.

[0045] However, in either case, the fuel gas is injected into the fuel inlet 211 of the fuel electrode side gas dispersion means, undergoes a chemical reaction while passing through the cell structure 100, and is then discharged from the gas outlet 221 located diagonally opposite the fuel inlet 211 in the fuel electrode side gas dispersion means. The air gas is injected into the gas inlet 211' of the air electrode side gas dispersion means, used in a chemical reaction while passing through the cell structure 100, and then discharged from the gas outlet 221' located diagonally opposite the inlet 211' in the air electrode side gas dispersion means.

[0046] Figure 3 is a detailed diagram of the gas flow plate and contact plate that constitute a gas dispersion means according to one embodiment of the present invention.

[0047] As mentioned above, the fuel electrode side gas dispersion means and the air electrode side gas dispersion means have the same technical configuration except for the positions of the gas inlets 211, 211' and the gas outlets 221, 221'. Therefore, redundant explanations will be omitted, and the fuel electrode side gas dispersion means will be explained in detail using Figure 3.

[0048] The gas dispersion means includes a contact plate 100 and a gas flow plate 200.

[0049] The contact plate 100 consists of a first side rim 110, a second side rim 120, and a body 130.

[0050] Multiple gas passages 111, 112 are formed side by side on the first side rim 110 of the contact plate 100, and multiple gas passages 121, 122 are also formed side by side on the second side rim 120. Alignment holes (H) for passing an alignment shaft may be formed in at least one region of the area between the gas passages 111, 112 and the outer region of each gas passage 111, 112.

[0051] If the gas dispersion means exemplified in Figure 3 is on the fuel electrode side, the aforementioned multiple gas passages 111, 112, 121, and 122 can be specified as follows.

[0052] Specifically, a first fuel passage 111 and a first air passage 112 are formed side by side on the first side rim 110 of the contact plate 100, a second fuel passage 121 is formed on the second side rim 120 of the contact plate 100 at a position diagonally opposite to the first fuel passage 111, and a second air passage 122 is formed at a position diagonally opposite to the first air passage 112.

[0053] Multiple slits are formed parallel to each other in the body 130 of the contact plate 100, extending from the first side rim 110 toward the second side rim direction 120.

[0054] At least a portion of the body 130 of the contact plate 100 is in close contact with the non-reactive region 302 of the edge of the cell structure 300. The gas flow plate 200 is in close contact with the opposite side of the contact plate 100 from the side in contact with the cell structure 300.

[0055] The gas flow plate 200 comprises a third side rim 210 having a shape corresponding to the first side rim 110 of the contact plate, a fourth side rim 220 having a shape corresponding to the second side rim 120 of the contact plate, and a body 230.

[0056] The third side rim 210 of the gas flow plate 200 has a gas inlet 211 and a gas passage 212, and the fourth side rim 220 has a gas outlet 221 and a gas passage 222. The gas inlet 211 and the gas outlet 221 are arranged to face each other diagonally.

[0057] If the gas dispersion means illustrated in Figure 3 is on the fuel electrode side, then the aforementioned gas inlet 211, gas passage 212, gas outlet 221, and gas passage 222 can be specified as follows.

[0058] Specifically, on the third side rim 210 of the gas flow plate 200, a fuel inlet 211 and a third air inlet 212 are formed at positions corresponding to the first fuel inlet 111 and the first air inlet 112 of the first side rim 110, respectively, and a fuel outlet 221 and a fourth air inlet 222 of the fourth side rim 220 are formed at positions corresponding to the second fuel inlet 121 and the second air inlet 122 of the second side rim 120.

[0059] The body 230 of the gas flow plate 200 has an intake channel 231, a unit diffusion channel 232, and an exhaust channel 233 formed therein.

[0060] The intake channel 231 is a comb-shaped channel that communicates with the gas inlet 211.

[0061] Each unit diffusion channel 232 consists of a horizontal channel 232-1, which is a horizontal groove, and a vertical groove 232-2. Multiple unit diffusion channels 232 may be arranged between the intake channel 231 and the discharge channel 233, in which case the horizontal channel 232-1 and the vertical groove 232-2 are arranged alternately and repeatedly without communicating with each other.

[0062] The discharge channel 233 is a comb-shaped channel that communicates with the gas outlet 221.

[0063] Figure 4 is a detailed diagram illustrating the gas dispersion principle of the gas dispersion means according to the embodiment shown in Figure 3.

[0064] As shown in Figures 3 and 4, the body 130 of the contact plate 100 may be provided with multiple stages of unit slits 131, each consisting of multiple slits.

[0065] In this case, it is preferable that the height of the unit slits adjacent to the first side rim 110 and the second side rim 120 among the multi-stage unit slits is formed to be higher than the height of the other unit slits in the intermediate portion that are not adjacent to the first side rim 110 and the second side rim 120.

[0066] Referring again to Figure 3, the unit diffusion channels of the gas flow plate 200 may be positioned on the contact plate 100 at a location corresponding to the boundary line L1 between the unit slits, and the horizontal channels of the gas flow plate 200 may be positioned on the horizontal line L2 between the upper and lower ends of the unit slits.

[0067] When contact plates and gas flow plates of this configuration are stacked to create gas distribution means for the fuel electrode side and the air electrode side, the flow of fuel and air in each gas flow plate can be described in detail as follows.

[0068] In other words, as shown in Figure 2, on the fuel electrode side, fuel is injected from the fuel passage port provided on the seventh side rim of the partition plate 500 into the fuel inlet 211 of the gas flow plate 200.

[0069] Then, as shown in Figure 4, the fuel flows into the comb-shaped intake channel 231 which is in communication with the fuel inlet 211, and then diffuses along the long horizontal grooves corresponding to the body in the comb shape in the x-axis (or left and right), while diffusing along the y-axis (or upward) between the vertical grooves corresponding to the comb teeth in the comb shape. Here, the fuel diffuses along the x and y axes, and at the same time passes through the slits of the contact plate 100 in the z-axis direction and is taken into the fuel electrode of the cell structure.

[0070] Next, referring to area A in Figure 4, since the comb-shaped intake channel 231 and the unit diffusion channel 232 are not connected to each other, the fuel, which was dispersed along the y-axis, stops diffusing at the tips of the comb-shaped teeth. Instead, upward diffusion continues through the slits of the contact plate 100 located at the tips of the comb teeth, into the horizontal channel 232-1 of the unit diffusion channel 232 (overflow).

[0071] Subsequently, diffusion in the x-axis (or left-right) direction occurs again in the horizontal channel 232-1 of the unit diffusion channel 232. At this time, since the horizontal channel 232-1 and the vertical groove 232-2 of the unit diffusion channel 232 are not connected to each other, when the horizontal channel 232-1 is full of fuel, the fuel continues to diffuse upward by overflowing (passing over) into the vertical groove 232-2 through the slits in the contact plate 100.

[0072] As mentioned above, upward diffusion using such slits is possible because the unit diffusion channels of the gas flow plate 200 are positioned at locations corresponding to the boundary line L1 between unit slits in the contact plate 100, and the horizontal channels of the gas flow plate 200 are positioned at locations corresponding to the horizontal line L2 between the upper and lower ends of the unit slits.

[0073] Furthermore, referring to area B in Figure 4, when fuel diffuses in the y-axis direction in a unit diffusion channel, it is systematically guided by a number of equally spaced vertical grooves 232-2, thereby preventing the fuel gas from accumulating in one place or diffusing while deformed into an irregular shape.

[0074] Figure 5 is a diagram showing the contact plate of a gas dispersion means according to another embodiment of the present invention.

[0075] As seen in the embodiment of Figure 5, in other embodiments, the body 130-1 of the contact plate 100-1 may not have multiple unit slits 131 arranged in multiple stages as in the embodiment of Figure 3 or Figure 4, but rather may have multiple long slits 131-1 connected from the upper end to the lower end of the body 130-1 and arranged parallel to each other.

[0076] Figure 6 is a cross-section of the cell package, which is formed by combining all the individual components shown in Figure 2.

[0077] As shown in Figure 6, one cell package is formed by sequentially and tightly laminating a partition plate 500, a gas dispersion plate 100 and a contact plate 200 of the fuel electrode side gas dispersion means, a cell structure 300, a sealant 400, a gas dispersion plate 100' and a contact plate 200' of the air electrode side gas dispersion means, and a partition plate 500'.

[0078] Therefore, the shapes of the side rims of the partition plate 500, the gas dispersion plate 100 and contact plate 200 of the fuel electrode side gas dispersion means, the sealant 400, the gas dispersion plate 100' and contact plate 200' of the air electrode side gas dispersion means, and the alignment holes and gas passage holes formed in the side rims are all formed identically. From the viewpoint of the cell package, three alignment holes and two gas passage holes are formed on the upper side rim, and three alignment holes and two gas passage holes are formed on the lower side rim.

[0079] Furthermore, when examining the cut surface of the cell package, it can be seen that gas flow channels with mirrored shapes are formed on the upper and lower surfaces, with the cell structure 300 located in the very center as the reference point. In this sense, the fuel electrode side gas dispersion means and the air electrode side gas dispersion means in the present invention can be described as bipolar plates.

[0080] Although the above has been described with reference to several embodiments relating to the present invention, a person with ordinary skill in the art will understand that the present invention can be modified and altered in various ways without departing from the spirit and scope of the invention as described in the claims below. [Explanation of symbols]

[0081] 100: Contact plate 110: First side rim 120: Second side rim 130: Contact plate body 200: Gas flow plate 210: Third side rim 220: Fourth side rim 230: Gas flow plate body 300: Cell structure 400: Sealant 500:Division board

Claims

1. Multiple gas passages are formed in the first side rim and the second side rim, and multiple slits parallel to each other are formed in the body in the direction from the first side rim to the second side rim, and a contact plate is provided in which the edge of the cell structure is in close contact with at least a part of the body, Of the two surfaces of the contact plate, the third side rim, which is in close contact with the surface opposite to the surface to which the cell structure is in close contact, has a gas inlet and a gas passage formed on it, and the fourth side rim, which is in close contact with the surface to which the cell structure is in close contact, has a gas outlet and a gas passage formed on it, and the body has a gas flow plate on which a comb-shaped inlet passage communicating with the gas inlet, a horizontal passage consisting of horizontal grooves, a unit diffusion passage consisting of vertical grooves, and a comb-shaped discharge passage communicating with the gas outlet is formed, Gas dispersion means for fuel cells or electrolytic equipment, including.

2. The body of the contact plate has, Multiple units of slits are arranged in multiple stages. A gas dispersion means for a fuel cell or electrolytic device according to claim 1.

3. The height of the unit slit adjacent to the first side rim and the second side rim is formed to be higher than that of other unit slits not adjacent to the first side rim and the second side rim. Gas dispersion means for a fuel cell or electrolytic device according to claim 2.

4. In the contact plate, the unit diffusion channel of the gas flow plate is positioned at a location corresponding to the boundary line between the unit slits, and the horizontal channel of the gas flow plate is positioned at a location corresponding to the horizontal line between the upper and lower ends of the unit slits. Gas dispersion means for a fuel cell or electrolytic device according to claim 2.

5. In the gas flow plate, the horizontal flow channels and vertical grooves of the unit diffusion channels are arranged alternately and repeatedly without communicating with each other. A gas dispersion means for a fuel cell or electrolytic device according to claim 1.

6. When the gas dispersion means is on the fuel electrode side, A first fuel passage and a first air passage are formed in the first side rim of the contact plate, a second fuel passage is formed in the second side rim of the contact plate at a position diagonally opposite to the first fuel passage, and a second air passage is formed at a position diagonally opposite to the first air passage. In the third side rim of the gas flow plate, a fuel inlet and a third air passage are formed at positions corresponding to the first fuel passage and the first air passage, respectively, and a fuel outlet and a fourth air passage are formed at positions corresponding to the second fuel passage and the second air passage. A gas dispersion means for a fuel cell or electrolytic device according to any one of claims 1 to 5.

7. A gas dispersion means according to claim 1, provided on the fuel electrode side, The gas dispersion means according to claim 1, provided on the air electrode side, A cell structure in which the fuel electrode is in close contact with a contact plate of a gas dispersion means provided on the fuel electrode side, and the air electrode is in close contact with a contact plate of a gas dispersion means provided on the air electrode side, A sealant is disposed between the gas dispersing means provided on the fuel electrode side and the gas dispersing means provided on the air electrode side to prevent gas leakage. Multiple cell packages are stacked on top of each other, each including a gas dispersion means provided on the fuel electrode side or a partition plate that seals the externally exposed surface of a gas flow plate provided on the gas dispersion means provided on the air electrode side. A cell stack for a fuel cell or electrolytic device.

8. The body of the contact plate has, Multiple units of slits are arranged in multiple stages. A cell stack for a fuel cell or electrolytic device according to claim 7.

9. The height of the unit slit adjacent to the first side rim and the second side rim is formed to be higher than that of other unit slits not adjacent to the first side rim and the second side rim. A cell stack for a fuel cell or electrolytic device according to claim 8.

10. In the contact plate, the unit diffusion channel of the gas flow plate is positioned at a location corresponding to the boundary line between the unit slits, and the horizontal channel of the gas flow plate is positioned at a location corresponding to the horizontal line between the upper and lower ends of the unit slits. A cell stack for a fuel cell or electrolytic device according to claim 8.

11. In the gas flow plate, the horizontal flow channels and vertical grooves of the unit diffusion channels are arranged alternately and repeatedly without communicating with each other. A cell stack for a fuel cell or electrolytic device according to claim 7.

12. When the gas dispersion means is on the fuel electrode side, A first fuel passage and a first air passage are formed in the first side rim of the contact plate, a second fuel passage is formed in the second side rim of the contact plate at a position diagonally opposite to the first fuel passage, and a second air passage is formed at a position diagonally opposite to the first air passage. In the third side rim of the gas flow plate, a fuel inlet and a third air passage are formed at positions corresponding to the first fuel passage and the first air passage, respectively, and a fuel outlet and a fourth air passage are formed at positions corresponding to the second fuel passage and the second air passage. A cell stack for a fuel cell or electrolytic device according to claim 7.

13. Fuel gas is injected into the fuel inlet of the gas dispersion means provided on the fuel electrode side and then discharged from a gas outlet located diagonally opposite the gas dispersion means provided on the fuel electrode side, and air gas is injected into the gas inlet of the gas dispersion means provided on the air electrode side and then discharged from a gas outlet located diagonally opposite the gas dispersion means provided on the air electrode side. A cell stack for a fuel cell or electrolytic device according to claim 7.

14. A fuel cell system comprising a cell stack of a fuel cell or electrolytic device according to any one of claims 7 to 13.

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