JPH0672159U - Solid electrolyte fuel cell - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent defective sealing due to deformation,
Also, to provide a solid electrolyte fuel cell capable of efficiently supplying gas to a power generation membrane. [Structure] A reaction part 52 having three layers of a fuel electrode, a solid electrolyte and an oxygen electrode and having dimple parts on both surfaces, and a reaction part 52.
In the solid electrolyte fuel cell provided with the dimple-type power generation membrane consisting of the gas introduction / exhaust portion 54 for introducing / exhausting gas into and from, the uneven portion 56 was formed in the gas introduction / exhaust portion 54. Further, the dimple portion is formed by a combination of large and small protrusions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solid oxide fuel cell, and more particularly to improvement of a dimple structure in a reaction part.

[0002]

[Prior art]

 Conventionally, there has been a dimple-type solid electrolyte fuel cell provided with a power generation membrane having a dimple portion formed of an uneven portion in a reaction portion. Such a dimple-type solid electrolyte fuel cell has an advantage that a large power generation effective area can be obtained and power generation performance can be improved because the dimple portion is formed in the reaction portion. The dimple type solid electrolyte fuel cell is divided into an external manifold type and an internal manifold type depending on the gas supply system.

FIG. 3A and FIG. 3B are diagrams showing a main part of an external manifold type dimple type solid electrolyte fuel cell. As shown in the figure, the battery body 10 includes a power generation film 11, a pair of gaskets 12 arranged so as to sandwich the power generation film 11, and a pair of interconnectors 13 arranged so as to sandwich these gaskets 12. It is configured. A large number of dimples D are regularly formed on the power generation film 11. Further, the supply side manifold 20 is connected to the battery main body 10 through the introduction portion 14 of the gasket 12, and the discharge side manifold 30 is connected through the discharge port 15.

FIGS. 4A and 4B show a main part of an internal manifold type dimple type solid electrolyte fuel cell. As shown in the figure, the battery main body 40 is composed of a power generation film 41, a gasket 42 arranged so as to sandwich the power generation film 41, and a pair of interconnectors 43 arranged so as to sandwich these gaskets 42. Has been done. Dimples D are regularly formed on the power generation film 41. Further, a gas introduction portion 44 and a gas discharge portion 45 are formed on the power generation film 41.

[0005]

[Problems to be solved by the device]

 The above-mentioned conventional dimple-type solid electrolyte fuel cell has the following problems. That is, since the gas inlet / outlet portions of the power generation membranes 11 and 41 are formed flat, they are mechanically weak and may deform due to their own weight due to thermal history during operation, resulting in poor sealing.

Further, since the dimples D formed on the power generation films 11 and 41 have regular shapes and positions, the gas flows linearly, and the gas is not sufficiently diffused throughout the power generation film. There has been a problem that the reaction parts 11 and 41 are not used efficiently, an unreacted region is generated, and power generation efficiency is reduced.

Therefore, an object of the present invention is to provide a solid electrolyte fuel cell capable of preventing sealing failure due to deformation and efficiently supplying gas to the reaction part of the power generation membrane. .

[0008]

[Means for Solving the Problems]

 In order to solve the above problems and achieve the object, the present invention provides a reaction part having three layers of a fuel electrode, a solid electrolyte, and an oxygen electrode and having dimple parts on both sides, and a gas introduction for introducing gas into this reaction part. In a solid electrolyte fuel cell including a dimple-type power generation membrane including a gas discharge part that discharges gas from the reaction part, an uneven portion is formed on the inner wall surface of the gas introduction part and the gas discharge part. Further, the dimple portion is composed of a combination of large and small protrusions.

[0009]

[Action]

 As a result of taking the above measures, the following effects occur. Since irregularities are formed on the inner wall surfaces of the gas introduction part and the gas discharge part, the mechanical strength around the gas introduction part and the discharge part is increased, and it is possible to prevent deformation due to the self-weight of the power generation membrane, resulting in poor sealing. Is prevented from occurring. Further, since the gas is diffused by the uneven portion provided in the gas introduction part, the gas is evenly introduced to the entire power generation film reaction part. On the other hand, since large and small dimples are formed in the reaction part, turbulent flow is more likely to occur compared to dimples of the same shape, gas diffuses more efficiently, power generation efficiency is improved, and connection resistance and cell Internal pressure loss is also reduced.

[0010]

【Example】

 FIG. 1A is a perspective view showing a structure of an internal manifold type dimple type solid electrolyte fuel cell according to an embodiment of the present invention, and FIG. 1B is a plan view of a power generation membrane. 2A is a plan view showing a part of the power generation film in an enlarged manner, and FIG. 2B is a perspective view thereof. In these figures, the same functional parts as those in FIG. 4 are designated by the same reference numerals.

The battery main body 50 includes a power generation film 51, a gasket 42 arranged on both sides of the power generation film 51, and a pair of interconnector films 43 arranged on both sides of the gasket 42. . As shown in FIGS. 2A and 2B, a dimple D composed of a combination of large and small protrusions is formed in the reaction portion 52 of the power generation film 51. In addition, the power generation film 51 is formed with gas introduction / exhaust portions 54, 55 that are in contact with the manifold, and an uneven portion 56 (omitted on the 55 side) is formed on the inner wall surface of the gas introduction / exhaust portions 54, 55. Has been formed.

With such a configuration, the gas is supplied to the power generation membrane 51 via the internal manifold, but at this time, the gas is supplied to the front side of the reaction section by the uneven portion 56 provided in the gas introduction / exhaust section 54. Is sufficiently diffused. The diffused gas is pushed out to the front surface by the gas continuously supplied and enters the reaction section 52. The gas that has entered the reaction portion 52 flows while being further diffused by the dimples D formed of large and small protrusions. Moreover, since the gas introduction / exhaust portions 54 and 55 of the power generation film 51 formed of YSZ (yttria-stabilized zirconia) are uneven, the mechanical strength is higher than that of the conventional flat film manifold, and the high temperature atmosphere. There is no need to worry about deterioration due to self-weight deformation due to long-term operation inside, and performance deterioration due to fuel gas leakage can be resolved. It should be noted that the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0013]

[Effect of device]

 According to the present invention, since the concavo-convex portion is formed on the inner wall surface of the gas introduction part / exhaust part, the introduction gas is diffused by the concavo-convex part and the gas is efficiently guided to the entire area of the power generation membrane reaction part. Mechanical strength is increased, deformation due to its own weight is prevented, and the occurrence of seal failure can be prevented in advance.

Further, since dimples composed of large and small protrusions are formed in the reaction portion, gas is diffused more efficiently, power generation efficiency is improved, and connection resistance and pressure loss inside the cell can be reduced. .

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of a solid oxide fuel cell according to an embodiment of the present invention, in which (a) is a perspective view of a cell body;
(B) is a plan view of the power generation film.

2A and 2B are enlarged views of a part of a reaction portion of a power generation membrane in the example, in which FIG. 2A is a plan view and FIG. 2B is a perspective view.

3A and 3B are diagrams showing a main part configuration of a conventional external manifold type solid electrolyte fuel cell, wherein FIG. 3A is a plan view of a power generation membrane and a gasket, and FIG. 3B is a perspective view of a cell body.

4A and 4B are views showing a conventional internal manifold type solid electrolyte fuel cell, wherein FIG. 4A is a plan view of a power generation membrane and a gasket, and FIG. 4B is a perspective view of a battery body.

[Explanation of symbols]

42 ... Gasket 43 ... Interconnector 50 ... Battery main body 51 ... Power generation film 52 ... Reaction part 54, 55 ... Gas introduction / exhaust part 56 ... Gas introduction uneven part

Claims (2)

[Scope of utility model registration request] 1. A reaction part comprising three layers of a fuel electrode, a solid electrolyte and an oxygen electrode and having dimple parts on both sides, a gas introduction part for introducing gas into the reaction part, and a gas for discharging gas from the reaction part. A solid electrolyte fuel cell provided with a dimple-type power generation membrane including an exhaust portion, wherein a concavo-convex portion is formed on inner wall surfaces of the gas introduction portion and the gas exhaust portion. 2. The solid electrolyte fuel cell according to claim 1, wherein the dimple portion is composed of a combination of large and small protrusions.