JPS59108278A - Laminated type fuel cell - Google Patents

Abstract

PURPOSE:To prevent excessive electrolyte from flowing into a gas flow path section or from being collected in a manifold by providing in form of a projection a receiver that receives the excessive electrolyte at the side of a laminated body consisting of a number of single cells and gas separation plates piled up alternately. CONSTITUTION:When the electrolytic matrixes are impregnated with the electrolyte during or after single cells 4, gas separation plates 5, and sealing materials 6 are piled up or even when the electrolyte flows in the initial stage of operation, since a receiver that receives the excessive electrolyte is provided in form of a projection at the side of a laminated body, the excessive electrolyte is prevented from flowing into the recess 2 of a rugged gas flow path section and from being collected in a manifold.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stacked fuel cell, particularly one that receives excess electrolyte falling down the side of the stack.

Conventionally, there have been gas storage plates for stacked fuel cores as shown in Figures 1 and 2. Figure 21 is a plan view of Figure 1 seen from the back, and (b) is the first
The same position as in FIG. 2 is shown. In the figure, (
1) is a convex portion of the uneven gas flow path portion, (2) is a recessed portion of the uneven gas flow path portion, and (3) is a seal portion.

The circuit layer of the 11-type fuel cell has a fuel straight rod, an electrolyte matrix, and an injection agent electrode, and the unit cells in which the periphery of the electrode is made of a sealing material and the gas separation plate are alternately arranged. This is done by laminating layers. FIG. 3 shows the FIT that has been laminated up to 4/J, with (4) showing the single cell, (5) the gas separation plate, and (6) the sealing material. When using a single piece or a stack of layers, the electrolyte matrix is impregnated with electrolyte, but if too much electrolyte is impregnated at this time, excess electrolyte flows out to the outside, creating an uneven gas flow. This results in an undesirable situation such as blocking the recess (2) in the road. On the other hand, if there is too little electrolyte, the characteristics of the battery will deteriorate.

Therefore, M of the '+'ji solute to be impregnated is strictly a part of H
It is necessary to do 5. A manifold, which is a structure for supplying both fuel and oxidant reaction gases, is installed in the stacked structure of the fuel cell that has been assembled as described above. By supplying gas, the 4L' single-layer combustion tank is operated. phosphoric acid f
: 2 in the case of phosphoric acid fuel cells used as sludge
After 00°C 11n, and in the case of bath-molten carbonate fuel cells using carbonate as electrolyte, it is operated at around 650'C. Further, in order to control the operating temperature, cooling plates are installed in the laminated body for each number, and temperature control is performed by liquid cooling or air cooling. In this case, the cooling plate also functions as the gas separation plate (5).

- Next, the operation will be explained. When the reaction gas is supplied, the fuel and oxidizer flow through the respective manifolds and through the concave portion (2) of the uneven gas flow path, and the fuel and oxidizer flow through the concave portion (2) of the uneven gas flow path, and
supplied to At this time, an electromotive force is generated in the cell (4), which is extracted as electric power by connecting it to an external load. When the reaction gases are hydrogen and air, water vapor is generated as a product, which flows through the recesses (2) of the uneven gas flow path together with the remaining reaction gas and is discharged to the outside through the manifold.

In addition, a sealing material (6) is used to seal between the layers to prevent the reaction gas from leaking to the outside, but in the case of phosphoric acid fuel cells, phosphoric acid is retained in this area, which is called the wet sealing method. The C μ method is commonly used. Therefore, a sufficient amount of phosphoric acid must be retained in the sealing material (6). However, the volume of phosphoric acid is large and changes depending on temperature changes and moisture content. Therefore, if the electrolyte matrix or sealing material (6) expands to a volume that exceeds its holding capacity, phosphoric acid flows out to the outside and accumulates in the recesses (2) of the uneven gas flow path, obstructing the flow of the reactant gas. . Alternatively, it may accumulate in the manifold and lead to undesirable conditions such as corrosion of the manifold. Such a phenomenon occurs at the beginning of operation of the S1 battery or when the operation is stopped. Therefore, in this case, remove the manifold! 1. It is necessary to remove the phosphoric acid that has flowed out into the manifold and the recesses (2) of the uneven gas flow path.
There was jjJ'. Moreover, such a phenomenon can occur not only in phosphoric acid fuel cells but also when other electrolytes are used.

In this way, in conventional A-type combustion batteries, the electrolyte flows out to the outside when the electrolyte is impregnated into the electrolyte matrix, or at the beginning of operation or when the operation is stopped, and the concave portion (2) of the uneven gas flow path is caused to flow out. It had the drawback of clogging and corroding the manifold.

In particular, the outflow of electrolytes in the 4* layer was extremely undesirable for the producers who carried out the 4* process, both from a process and health standpoint.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it is a receiver for receiving excess electrolyte falling down the side of a 4-piece 1fflη body in which a plurality of unit cells and gas separation plates are laminated alternately. By extending the body above (JJ11), the above-mentioned extra stimulant solute will not flow into the concave part l of the uneven gas flow path or accumulate in the manifold. The purpose of this research is to provide a stacked fuel cell.

An embodiment of the present invention will be described below with reference to the drawings. Fourth
1 Ma, Figure 5 shows the gas separation plate (5
), and FIG. 5 is a view of FIG. 4 seen from the back side. In this case, (7) is a convex portion that is provided at the end of the uneven gas flow path portion and is lower than the other convex portions (1). I! υThis part (7) is the opposite sealing material (6)
There will be a gap between the two. FIGS. 6 and 7 show a receiver body (8), which is a cover for an uneven gas flow path portion with a smooth side facing the sealing material (6), inserted into the above-mentioned gap. This receiver is shown in the 81st enlarged view of the inserted part of the body (8).
Figure 8 shows the state of the receiver before inserting the body (8), and Figure 9 shows the state of the receiver after inserting the body (8). The layered state is shown with a portion cut away. Note that Figures 8 and 9 show the uneven portion (1) of the gas flow path.
(2) really shows the number. Furthermore, Figure 1 shows the state where up to four layers have been laminated. Note that the shape of the protrusion (7), which is lower than the other protrusion (1) at the end of the uneven gas flow region near the inlet and outlet of the reactant gas, is triangular.

In order to improve the flow of the reaction gas,
The figure shows the insertion position of the receiver body (8) when the uneven channel section is below the cell battery (4), and Figure 12 shows the insertion position of the receiver body (8) when the channel section is below the cell cell (4).
4) is a sectional view showing the insertion position of the body (8) when the receiver is on top. One receiver (8) has *! IF-
A recessed portion is provided on the upper surface of the protruding portion so that excess electrolyte falling down the side surface of the stack can be collected and stored.

Next, the operation will be explained. Electrolyte (IJ)
Even if the electrolyte flows out during Lux impregnation or at the beginning of operation, it does not flow into the uneven gas flow path or manifold, and the receiver remains in the recessed part of the body (8).

Therefore, the flow of the reaction gas is not obstructed, and the manifold is not corroded. Also, electrolytes
Even when impregnating the solute matrix, the uke will not flow out of the body (8) even if it is impregnated in excess, so 1. Impregnation i・
It is no longer necessary to precisely adjust i' as in the past.

In the above embodiment, the flow of the reactant gas was improved by making the convex part (7) of the concave-convex gas flow path part of the insertion part of the receiver body (8) triangular. As shown in FIG. 3, the concave portion (9) of the uneven gas flow path portion of the insertion portion of the body (8) may be made lower than the other concave portions (2), and the same effect as in the Uami embodiment can be obtained.

In addition, in the example '-J above, a case is shown in which the receiver body (8) is completely inserted between the end of the uneven gas passage section and the sealing material (6), but the gas separation plate ( 5) -'1ris was stretched out from the side 110 of the product 1d body and the receiver was made a body (near 4
It may be completed.

The case where the reactive gas flow path is formed on the gas distribution plate (5) has been described above, but the case where the reaction gas flow path is formed on the fuel type (litter) and other gas electrodes (with rig) has been described. (electrode) as well as for each flow path section.Same as the example above:
By establishing 14 structures, υ上'iF! Effects similar to those of the example are expected.

As described above, according to the present invention, the receiver for receiving surplus electrolyte falling down the side surface of the laminate in which ponds and gas separation plates are alternately stacked is provided with its body protruding beyond the side surface. Therefore, it is possible to obtain a straight pond in which the excess electrolyte does not flow into the four parts of the uneven gas flow να or accumulate in the manifold.

[Brief explanation of the drawing]

FIG. 11 and FIG. 2 are plan views showing the conventional turtle board, and FIG. 2 is a view of FIG. 1 from the back side. Fig. 3 is a perspective view of a conventional turret and I-1 type fuel cell; Figs. 41 and 51; In the figure, FIG. 5 is a view of FIG. 41 from the ≦ side. Figures 6 and 7 are the 4th
1A and gas component 14 in FIG. : A plan view showing the state in which the body is inserted into the plate, and part 81 is the gas direction 5 in Fig. 51.
FIG. 9 is a perspective view showing an enlarged view of the end of the concave-convex channel portion of the plate. Enlarged perspective view with partial cutaway, No. 10
The figure is a perspective view showing a stacked fuel cell according to an embodiment of the present invention. 1 new surface map, 1st
FIG. 3 is a perspective view showing an enlarged end of the concavo-convex channel portion of a gas portion M plate according to another embodiment of the present invention. In the figure, (1) is the convex part of the uneven gas flow path part, (2)
(3) is the sea JV part of the uneven gas flow path, (4) is a cell, (5) is the gas portion 1i4
G plate, (6) is the sealing material of the single pond (4), and (7) is the convex part (of the uneven gas well path part) opposite to the sealing material (6).
The end of 1), (8) is the body. Glue, the same sign in one meat is the same or (・``1 hit, 1[5
shall indicate the minutes. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 7 Figure 9; Figure 11 Figure 12 Figure 131

Claims (3)

[Claims] (1) A unit cell having a fuel electrode, an electrolyte matrix, and an oxidizing agent, and having a sealing material at the periphery of the electrode,
a gas distribution plate, an uneven fuel gas flow path portion formed with a plurality of grooves on either one of the surfaces between the fuel electrode and the gas separation plate, and between the oxidizer electrode and the gas separation plate; A laminated type comprising an uneven oxidant gas flow path formed by a plurality of grooves on one side of both, and a plurality of the above-mentioned unit cells and gas separation plates are alternately laminated to form a phase layered body. A stacked fuel cell characterized in that a receiver for receiving excess electrolyte falling down the side surface of the stacked body in the fuel cell is provided with a body extending out from the side surface. (2) The body of the receiver is a part of the gas separation plate that is stacked on the side of the four body.
The stacked fuel cell according to claim 1, wherein the stacked fuel cell has an overhanging structure. (3) The uneven gas passage section is formed on the gas separation plate, and the receiving body is partially provided at the end of the uneven gas passage section facing the sealing material, 3. The stacked fuel cell according to claim 1, wherein the cover for the uneven flow path portion has a smooth material side.