JP3494560B2 - Solid oxide fuel cell - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid oxide fuel cell, and more particularly to a gas seal structure for a flat plate solid oxide fuel cell.

[0002]

2. Description of the Related Art A flat plate type solid oxide fuel cell (10) has a structure as shown in FIGS.
A cell plate (20) having an anode (14) on one surface of a solid electrolyte plate (12) and a cathode (16) on the other surface (see FIG. 7).
A fuel plate (24) having a fuel chamber (22) in which the fuel gas flows, and an oxidant plate (28) having an oxidant chamber (26) in which the oxidant gas flows, the fuel chamber ( 22), a plurality of layers are formed so that the oxidant chamber (26) faces the cathode side. The fuel chamber (22) and oxidant chamber (26) are
4) It is formed by forming a large number of concave grooves in (26). In general,
The fuel plate (24) and the oxidant plate (28) are not separately formed, but a bipolar plate (30) having a fuel chamber (22) on one surface and an oxidant chamber (26) on the other surface. ). Note that the bipolar plate (3
A description will be given using 0).

The cell plate (20) and the bipolar plate (3
(0) is a fuel gas flow path (32) through which a fuel gas containing hydrogen gas flows, an oxidant gas flow path (34) through which an oxidant gas containing oxygen gas flows, and a fuel exhaust gas generated by a cell reaction. The fuel exhaust gas flow path (36) that circulates is opened so as to penetrate the plates (20) and (30) in a stacked state. The oxidant exhaust gas generated by the cell reaction is directly discharged to the outside from the oxidant discharge passage (38) which is opened through the bipolar plate (30) toward the outside (see FIG. 3 of the present invention). The oxidant exhaust gas passage may be opened in the stacking direction of the plates (20) and (30) like other passages.

The fuel gas channel (32) communicates with the fuel chamber (22),
The oxidant gas flow channel (34) communicates with the oxidant gas flow channel (34), and the gas flowing through the gas flow channels (32) and (34) respectively has a fuel chamber (2
2), supplied to the oxidant chamber 26, and a cell reaction occurs via the anode 14, the solid electrolyte plate 12 and the cathode 16.
Further, the fuel chamber (22) communicates with the fuel exhaust gas flow channel (36), and the exhaust gas consumed in the fuel chamber (22) passes through the gas flow channel (36) and the solid oxide fuel cell (10). ) Is discharged to the outside.
The oxidant exhaust gas is as described above.

The solid electrolyte plate (12) is produced mainly by molding a stabilized zirconia such as yttria-stabilized zirconia (YSZ) into a thin plate and sintering it at, for example, about 1500 ° C. This kind of electrolyte needs to be operated at a high temperature of about 800 ° C. to 1000 ° C. in order to obtain high ionic conductivity.

By the way, the gas flowing through the gas flow paths (32) and (34) and the gas flowing through the fuel chamber (22) and the oxidant chamber (26) flow between the cell plate (20) and the bipolar plate (30). Conventionally, as shown in FIG. 6, in order to prevent leakage from the gap,
Around the flow path, the fuel chamber and the oxidant chamber, glass that softens at the operating temperature of the solid oxide fuel cell (10) or lower is used as a sealing material.
Interposed as (40). The reason why the glass that becomes soft at the operating temperature is used as the sealing material (40) is that the softened glass adheres to the plates (20) and (30) during battery operation to obtain a better sealing effect. Because you can

[0007]

When the battery is repeatedly operated and stopped, the battery has an operating temperature of 800 ° C to 1000 ° C.
Repeat the thermal cycle between ℃ and near room temperature.
By this thermal cycle, the glass as the sealing material (40) is softened during operation and hardened when stopped. As a result, the stress caused by the thermal expansion and thermal contraction of the glass causes cracks and cracks in the solid electrolyte plate (12) formed in a thin plate to reduce the sealing effect, and as a result of gas cross-leakage, battery power generation. There was a risk that the performance would deteriorate.

The inventors of the present invention compared the seal formed around the gas flow passage with the seal formed around the gas flow passage in the seal provided on the cell plate. Is required to be more airtight than the seal of the battery reaction part, and conversely, the seal of the battery reaction part is
It was found that thermal expansion and thermal contraction do not occur rather than airtightness, and it is required not to apply thermal stress to the cell plate,
The present invention has been reached.

An object of the present invention is to provide a solid oxide fuel cell in which the sealing effect is not deteriorated even if the thermal cycle is repeated and the cell performance is not deteriorated.

[0010]

In order to solve the above problems, the solid oxide fuel cell (10) of the present invention comprises an anode (14) on one surface of a solid electrolyte plate (12) and an anode (14) on the other surface. Cathode
A cell plate (20) having (16), a fuel plate (24) having a fuel chamber (22) in which fuel gas flows, and an oxidant plate (28) having an oxidant chamber (26) in which oxidant gas flows ) And the fuel chamber (22) on the anode side and the oxidant chamber (2
6) laminated so that they face each other, each plate (20)
In (24) and (28), gas flow paths (32) and (34) through which the fuel gas and the oxidant gas flow are opened so as to penetrate the plates in a stacked state, and the cell plate (20) and Fuel plate (2
4) and between the cell plate (20) and the oxidizer plate (28), in a solid oxide fuel cell in which a sealing material for preventing gas leakage is arranged, the cell plate (20) is a solid electrolyte. An electrolyte plate (44) having an anode (14) and a cathode (16) on a plate (12), and a gas flow plate (46) in which gas flow paths (32) (34) are formed, and an electrolyte plate (44) Between the fuel plate (24) and the fuel plate (24) and between the electrolyte plate (44) and the oxidizer plate (28), the first sealing material (50) made of a material that does not soften at the operating temperature of the cell is arranged. Between the gas flow plate (46) and the fuel plate (24) and between the gas flow plate (46) and the oxidizer plate (28), there is a second material made of a material that is in a softened state at the operating temperature of the battery. The sealing material (52) is arranged.

The gas distribution plate (46) is an electrolyte plate.
It is desirable to provide so as to surround the periphery of (44).

The first seal material (50) is preferably provided so as to cover the peripheral edge portion of the electrolyte plate (44) and the end surface thereof. A ceramic fiber may be used as the first sealing material (50).

The gas flow plate (46) may be made of a material having a higher strength than the electrolyte material forming the electrolyte plate (44) in order to increase the strength. Further, the gas flow plate (46) may be thicker than the electrolyte plate (44) to enhance the strength.

[0014]

[Operation and effect] Battery operating condition (approx.
At about 0 ° C.), the first sealing material (50) for sealing the electrolyte plate (44) does not soften, and the gas passage plate
The second sealing material (52) for sealing (46) is softened.
In the present invention, since the first sealing material (50) does not soften at the battery operating temperature and is not affected by the thermal stress due to the thermal cycle as in the conventional case, cracks or cracks may occur in the electrolyte plate (44). There is no. Further, the second sealing material (52) for sealing the gas passages (32) (34), which is required to have high sealing performance, is in a softened state at the battery operating temperature, and the plates (46) (24) (28) ), And exhibits an excellent sealing effect. Therefore, the gas does not leak to the fuel chamber (22) or the oxidant chamber (26) from the predetermined flow path, especially from the flow path.

As described above, in the present invention, the electrolyte plate (44) is prevented from coming into direct contact with the sealing material which is softened at the operating temperature of the battery. Is not subject to thermal stress. On the other hand, since the gas distribution plate (46) is sealed with a sealing material that softens at the operating temperature of the battery and exhibits a high sealing property, no gas leak occurs.

By the way, when ceramic fibers are used as the first seal material (50), a part of the gas supplied to the fuel chamber (22) or the oxidant chamber (26) is part of the first seal material (50). Five
Although it may leak to the other side through the inside of (0), its effect compared to the cross leak caused by cracks and cracks due to thermal cycle of the cell plate (20) and deterioration of battery performance as in the past. Is small. This will be described in Examples. In order to improve the sealing property of the first sealing material (50), the third sealing material (54) made of a material that becomes a softened state at the battery operating temperature is replaced with the first sealing material (50).
And the fuel plate (24) and the oxidizer plate (28). The third seal material (54) is in a softened state at the battery operating temperature, adheres well to the plates (24) and (28) and exhibits an excellent sealing effect, and part of the third seal material (54) is in the first seal material (50). Permeate into and prevent gas from leaking from the first sealing material (50).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, a bipolar plate in which a fuel plate (24) and an oxidizer plate (28) are integrally formed
Although the description will be made using (30), the fuel plate (24) and the oxidant plate (28) may be formed separately. Further, in the following, the internal manifold type solid oxide fuel cell having the gas passages (32) (34) (36) (38) provided therein will be described.
The present invention can also be applied to an external manifold type solid oxide fuel cell having a gas channel provided outside.

The flat plate solid oxide fuel cell (10) is shown in FIG.
Cell plate (20) and bipolar plate as shown in
It is formed by alternately stacking (30). Bipolar plate
As shown in FIGS. 1 to 3, the plate (30) has a fuel chamber (22) formed on one surface and an oxidant chamber (26) formed on the other surface.
A fuel gas flow channel (32), an oxidant gas flow channel (34), and a fuel exhaust gas flow channel (38) are formed in the layer (30) in the stacking direction of the plates (20) and (30). The fuel chamber (22) communicates with the fuel gas flow channel (32) and the fuel exhaust gas flow channel (36) (see FIG. 2), and the oxidant chamber (2
6) communicates with the oxidant gas flow path (34) (see FIG. 3). Further, as shown in FIG. 3, the oxidant chamber (26) has a bipolar plate (30) opened in a direction parallel to the plate and communicates with an oxidant exhaust gas flow channel (38) which communicates with the outside. The chemical exhaust gas is discharged directly to the outside through the oxidizing gas flow channel (38).

The cell plate (20) comprises an electrolyte plate (44) having an anode (14) on one surface of a solid electrolyte plate (12) and a cathode (16) on the other surface, and a gas flow path (32) (). It is composed of a gas distribution plate (46) formed with 34 and (36). The electrolyte plate (44) has the anode (14) formed on one surface of the solid electrolyte plate (12) and the cathode (16) formed on the other surface. The solid electrolyte plate (12) is formed to be slightly larger than the anode (14) and the cathode (16), and the peripheral edge portion and the end surface of the solid electrolyte plate (12) are as shown in FIGS. 2 and 3. , Covered with a first sealing material (50) that does not soften at the battery operating temperature. Ceramic fibers can be used as the seed sealing material.

When a thin cloth-like ceramic fiber is used as the first sealing material (50), an adhesive is applied to the peripheral edge portion and the end surface of the electrolyte plate (44), and the ceramic fiber cut into a predetermined shape is used. By sticking, the peripheral edge of the electrolyte plate (44) and its end face can be covered.

The gas distribution plate (46) is composed of four plates (60) (62) (64) (66) as shown in FIG.
The first plate (60) has a fuel gas flow channel (32) formed therein, and the second plate (62) has a fuel exhaust gas flow channel (34) and an oxidant exhaust gas flow channel (36) formed therein. There is. Gas flow path (32) (34)
(36) is formed so as to communicate with the gas passage of the bipolar plate when the first plate (60) and the second plate (62) are arranged between the bipolar plates (30) and (30).
The third plate (64) and the fourth plate (66) are arranged laterally of the electrolyte plate (44), and are formed in an elongated plate shape as shown in FIG. As shown in FIGS. 2 and 3, a second sealing material (5) that softens at a battery operating temperature or less is provided on both surfaces of the first to fourth plates (60) (62) (64) (66).
2) has been deployed. As the seed sealing material, glass having a softening point equal to or lower than a battery operating temperature can be mentioned.
When glass having a softening point equal to or lower than the battery operating temperature is used as the second sealing material (52), a thin plate glass cut into a desired shape is used as an adhesive as a method of attaching the sealing material (52) to the plate. And a method of mixing powdery glass and a solvent such as terpineol to form a slurry, applying the slurry to a plate, and drying.

The bipolar plate (30), the electrolyte plate (44), and the gas distribution plate (46) having the above-mentioned structure are used, and the first sealing material (50) is the bipolar plate (30) and the electrolyte plate.
1 with the second seal member (52) interposed between the bipolar plate (30) and the gas distribution plate (46) (see FIGS. 2 and 3). As shown in FIG. 2, a plurality of layers are stacked, and both ends thereof are fastened by end plates (not shown) to manufacture a solid oxide fuel cell (10).

A current collecting material (not shown) made of Ni felt or the like was attached to the anode surface of the electrolyte plate (44) on the fuel chamber side, and current was collected on the cathode surface of the electrolyte plate (44) in the oxidant chamber. It is desirable to form an oxide layer (not shown) made of La _0.9 Sr _0.1 CoO ₃ or the like as the layer.

In the solid oxide fuel cell (10) having the above structure,
When fuel gas and oxidant gas are supplied, a cell reaction occurs,
The temperature of the battery (10) rises to about 800 ° C to 1000 ° C. At the operating temperature of the battery (10), the second sealing material (52) is softened and thermally expanded, and adheres well to the gas distribution plate (46) and the bipolar plate (30) to provide an excellent sealing effect. To do. As a result, the gas flowing through the gas flow paths (32), (34) and (36) does not leak into the fuel chamber (22) and the oxidant chamber (26). When the battery (10) is stopped and the temperature is lowered, the second sealing material (52) which has been softened and thermally expanded is hardened again and thermally contracted. This thermal stress may cause cracks in the gas distribution plate (46), but when the battery (10) is activated again, the softened second sealing material (52) fills the cracks, which is a particular problem. There is no.

Since the first sealing material (50) does not soften even at the operating temperature of the battery (10), it does not come into close contact with the electrolyte plate (44) and the bipolar plate (30), and a slight gas cross leak occurs. , Even if the battery is stopped, the first sealing material (50)
Does not thermally contract, so it does not apply thermal stress to the electrolyte plate (44). Therefore, the electrolyte plate (44) will not be cracked.

As shown in FIG. 4, the gas flow plate (46) may be formed thicker than the electrolyte plate (12) of the electrolyte plate (44) so as to have strength. Also,
The gas flow plate (46) may be made of a material different from that of the electrolyte plate (12). However, it is desirable that the gas distribution plate (46) be made of a material that has electrical insulation and is chemically stable even at the operating temperature of the battery.

Further, as shown in FIG. 4, the first sealing material
A third sealing material (54) that softens below the operating temperature of the battery may be disposed between (50) and the bipolar plate (30).
The third sealing material (54) becomes a softened state at the battery operating temperature, and a part thereof penetrates into the first sealing material (50) to suppress gas leakage from the first sealing material (50). You can In order to prevent thermal stress from being applied to the electrolyte plate (44), the third sealing material (54) is made of a material in which glass is mixed with about 20 wt% to about 50 wt% of zirconia. Is desirable. As described above, by mixing zirconia, the gas sealing property is slightly lowered, but the thermal cycle property is improved and thermal expansion and thermal contraction are less likely to occur as compared with the case where glass is used alone as the sealing material.

[0028]

【Example】

<Example 1> As shown below, four types of solid oxide fuel cells having different cell plate structures and sealing materials were assembled, the cells were operated, and the sealing efficiency before and after the thermal cycle was measured. Examined. The sealing efficiency was determined by the flow rate of fuel gas discharged from the fuel cell (discharge flow rate / supply flow rate) with respect to the flow rate of fuel gas supplied to the fuel cell.

First, components and the like common to the produced solid oxide fuel cell will be described. Electrolyte Plate (12)
Of 200 μm in thickness as 3 mol% Y ₂ O ₃ -97 mol% Z
Using rO ₂ (3YSZ), YSZ (8 mol% yttria-added stabilized zirconia) and N were formed on one surface of the electrolyte plate (12).
Arrange the anode (14) prepared from iO and place Y on the other side.
Cathode prepared from SZ and La _0.6 Sr _0.2 MnO ₃
(16) was arranged so that the effective area of the anode (14) and the cathode (16) would be 150 mm × 150 mm. In addition, as the bipolar plate (30), INCONEL 600 which is a heat resistant alloy
(Trade name: composition by weight% Cr: 16, Fe: 9, M
n: 0.4, Ti: 0.3, Al: 0.2, C: 0.03,
Ni: the rest) plate is cut and polished to form a fuel chamber (22) on one surface and an oxidant chamber (26) on the other surface, and gas flow paths (32) (34) (36) (38) was formed. In addition, a current collecting material (not shown) made of Ni felt was attached to the anode surface of the electrolyte plate (44) on the fuel chamber side, and La _0.9 was used as a current collecting layer on the cathode surface of the electrolyte plate (44) in the oxidant chamber. Sr
An oxide layer of _0.1 CoO ₃ is formed.

Each solid oxide fuel cell will be described. Inventive Example 1 As shown in FIG. 2, the cell plate (20) is replaced with an electrolyte plate.
(44) and the gas distribution plate (46), the periphery of the electrolyte plate (44) is covered with the first sealing material (50), and the gas distribution plate (46) is covered with the second sealing material (52). It was made by sealing with. The gas distribution plate (46) has a thickness of 625 μm.
3YSZ was used. Ceramic fibers were used as the first sealing material (50) and glass was used as the second sealing material (52). Inventive Example 2 As shown in FIG. 4, the cell plate (20) was replaced with an electrolyte plate.
(44) and a gas distribution plate (46), the periphery of the electrolyte plate (44) is covered with a first sealing material (50), and the first sealing material (50) and a bipolar plate (30) are provided. A third sealing material (54) was placed between the two, and the gas distribution plate (46) was sealed with the second sealing material (52) to produce the same. The gas distribution plate (46) was made of 3YSZ having a thickness of 625 μm. First
A ceramic fiber was used as the sealing material (50), glass was used as the second sealing material (52), and glass and zirconia were mixed at a weight ratio of 60:40 as the third sealing material (54).

Comparative Example 1 As shown in FIG. 6, a glass was placed between the cell plate (20) and the bipolar plate (30) as a sealing material (40) to fabricate. Comparative Example 2 As shown in FIG. 8, the sealing material (40) of the solid oxide fuel cell of FIG. 6 has a two-layer structure (70) (72), and the sealing material (70) on the side in contact with the cell plate (20). A ceramic fiber was used, and a material in which glass and zirconia were mixed at a weight ratio of 60:40 was used for the sealing material (72) on the side in contact with the bipolar plate (30).

Fuel gas and oxidant gas were supplied to each of the above solid oxide fuel cells to operate the cells, the supply amount and the discharge amount of the fuel gas were measured, and the sealing efficiency (discharge amount / supply amount) was calculated. . The results are shown in Table 1 (first time). After that, stop the gas supply, lower the cell temperature to room temperature, raise it to the operating temperature again, supply the fuel gas and the oxidant gas to each cell again, and measure the fuel gas supply amount and discharge amount in the same manner. Then, the sealing efficiency (discharge amount / supply amount) was calculated. The results are shown in Table 1 (after one thermal cycle).

[0033]

[Table 1]

Referring to Table 1, the sealing efficiency at the first time (before the passage of the thermal cycle) is highest in Comparative Example 1 in which all sealing is performed with glass, and Inventive Example 1 and Inventive Example 2 are slightly comparative examples. It is inferior to 1. In addition, Comparative Example 2
The sealing efficiency is about 20% lower than these. Inventive Example 1 and Inventive Example 2 were inferior to Comparative Example 1 because the gas slightly leaked from the ceramic fiber as the first sealing material (50). The reason why Comparative Example 2 is inferior is that a large amount of gas leaks from the fuel gas flow channel (32) directly into the oxidant chamber (26) as shown by the dashed line arrow in FIG.

On the other hand, regarding the sealing efficiency after one thermal cycle, the invention example 1, the invention example 2 and the comparative example 2 were:
While the value is the same as that at the first time, Comparative Example 1 greatly decreases. This is because Invention Example 1, Invention Example 2 and Comparative Example 2 are
This means that the seal material is not affected by the thermal stress associated with the thermal cycle, and in Comparative Example 1, the solid electrolyte plate is cracked or cracked due to the thermal stress due to the thermal expansion and thermal contraction of the seal material. That is, a large amount of fuel gas leaked to the oxidant chamber side and the sealing efficiency decreased.

Example 2 Next, invention example 2 and comparative example 1
For the solid oxide fuel cell of Comparative Example 2, the change in cell voltage (at 0.3 A / cm ² ) when the initial fuel utilization rate was changed was examined. As a result, as shown in FIG. 4, when the fuel utilization rate becomes high in any of the batteries,
It can be seen that although the cell voltage is decreased, the degree of decrease in Invention Example 2 and Comparative Example 1 is smaller than that in Comparative Example 2. In this way, the reason why the change in the fuel utilization rate characteristics of Inventive Example 2 and Comparative Example 1 is small is that there is almost no gas leakage from the sealing material, and in Comparative Example 2, the sealing performance of the sealing material is low. Low,
Since there is a large amount of gas leakage, it is considered that the cell voltage decreased when the fuel utilization rate was increased.

From the above results, it is understood that the solid oxide fuel cell of the present invention can maintain high sealing efficiency not only at the first time but also when the thermal cycle is repeated.

Example 3 Next, regarding the solid oxide fuel cell (see FIG. 4) in which the cell plate (20) was divided into the electrolyte plate (44) and the gas distribution plate (46), the plate (4
4) The sealing materials (50), (52), and (54) of (46) were changed, and the performance against the thermal cycle and the sealing performance were evaluated. As an example of the invention, a ceramic fiber is used as the first sealing material (50) and glass is used as the second sealing material (52) (Invention example 3), and glass and zirconia are used as the third sealing material in a weight ratio of 60. : Inventive Example 4 was prepared using the materials mixed in the ratio of 40. In addition, as reference examples, those using glass for the first sealing material (50) and the second sealing material (52) (reference example 1), those using ceramic fibers for the sealing materials (50) (52) (Reference Example 2) was produced. The results are shown in Table 2.

[0039]

[Table 2]

Referring to Table 2, the glass sealant (50)
The reference example 1 used as (52) is excellent in sealing property,
It can be seen that the glass softens at the battery operating temperature, expands and contracts thermally, and applies thermal stress to the solid electrolyte plate (12), so that the performance against the thermal cycle is inferior. In addition, the reference example 2 using the ceramic fiber as the sealing material (50) (52) is excellent in the performance against the thermal cycle because the sealing material does not thermally expand or contract even at the battery operating temperature, but the ceramic fiber does not generate gas. It can be seen that the seal performance is inferior because it easily penetrates. On the other hand, Invention Example 3 is the first
Since it uses ceramic fiber as the sealing material (50) of, it has excellent performance against thermal cycle and also
Since glass is used as the second sealing material (52), the sealing performance is also excellent. Inventive Example 4 prevents the gas leak from the first seal material (50) from occurring in the third seal material.
Since it is blocked by (54), it can be seen that it is particularly excellent in both thermal cycle performance and sealing performance.

From the above results, a material that does not soften at the battery operating temperature is used as the first sealing material (50) to ensure resistance to thermal cycles, and a material that softens at the battery operating temperature as the second sealing material (52). It can be seen that a solid oxide fuel cell having excellent cell performance can be obtained by ensuring the sealing performance by using. Also, the first sealing material (50)
By further providing a third sealing material (54) that softens at the cell operating temperature in order to improve the sealing performance of the above, a solid oxide fuel cell excellent in thermal cycle and sealing performance can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded view of a solid oxide fuel cell device of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along line AA in the arrow direction.

FIG. 3 is a sectional view of FIG. 1 taken along line BB in the direction of the arrow.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a graph showing the results of Example 2.

FIG. 6 is a cross-sectional view of a conventional solid oxide fuel cell.

FIG. 7 is a perspective view of a conventional cell plate.

FIG. 8 is a cross-sectional view of a comparative solid oxide fuel cell used in Examples.

[Explanation of symbols]

(10) Solid oxide fuel cell (20) Cell plate (24) Fuel plate (26) Oxidizer plate (30) Bipolar plate (44) Electrolyte plate (46) Gas distribution plate (50) (52) (54) Seal material

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukinori Akiyama 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Yasuo Miyake 2-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 in Sanyo Electric Co., Ltd. (72) Inventor Koji Nishio 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-8-236126 (JP, A) Flat 3-257760 (JP, A) Actual Flat 3-33959 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 8/02 H01M 8/12

Claims (6)

(57) [Claims] 1. An anode on one surface of a solid electrolyte plate (12)
(14), the cell plate (2 having the cathode (16) on the other surface
0), a fuel plate (24) having a fuel chamber (22) in which the fuel gas flows, and an oxidant plate (28) having an oxidant chamber (26) in which the oxidant gas flows, and the fuel plate (24) on the anode side. Chamber (22),
On the cathode side, the oxidant chamber (26) is formed so as to be opposed to each other, and each plate (20) (24) (28) has a gas flow path (32) (where the fuel gas and the oxidant gas flow). 34) is opened so as to penetrate the plates in a stacked state, and between the cell plate (20) and the fuel plate (24) and between the cell plate (20) and the oxidant plate (28). In a solid oxide fuel cell in which a sealing material for preventing gas leakage is arranged in the cell plate (20), the solid electrolyte plate (12) is attached to the anode (14).
And an electrolyte plate (44) having a cathode (16) and a gas flow plate (46) in which gas channels (32) (34) are formed, and between the electrolyte plate (44) and the fuel plate (24). , And a first sealing material (50) made of a material that does not soften at the operating temperature of the battery, is disposed between the electrolyte plate (44) and the oxidizer plate (28), and the gas flow plate (46) Between the fuel plate (24) and between the gas flow plate (46) and the oxidant plate (28), there is a second material made of a material that is in a softened state at the operating temperature of the cell.
A solid oxide fuel cell, characterized in that the sealing material (52) is provided. 2. The solid oxide fuel cell according to claim 1, wherein the gas flow plate (46) is provided so as to surround the periphery of the electrolyte plate (44). 3. The first sealing material (50) is an electrolyte plate.
The solid oxide fuel cell according to claim 1 or 2, wherein the peripheral edge of (44) and its end face are covered. 4. The solid oxide fuel cell according to claim 1, wherein the first sealing material (50) is made of ceramic fiber. 5. A first seal member (50) and a fuel plate (24).
Between the first sealing material (50) and the oxidizer plate (28)
The solid electrolyte fuel cell according to any one of claims 1 to 4, wherein a third sealing material (54) made of a material that is in a softened state at the operating temperature of the cell is provided between and. 6. A fuel plate (24) and an oxidizer plate (28)
Is a bipolar plate (30) having a fuel chamber (22) on one surface and an oxidant chamber (26) on the other surface. battery.