JPS5844672A - Matrix-type fuel cell - Google Patents

Abstract

PURPOSE:To increase the airtight adhesion between each of an anodic and a cathodic gas electrode and a separating carbon plate, and prevent any gas leak from the end surface of a unit cell by impregnating the peripheral parts of diffusing layers, which are on the back surfaces of the said electrodes, with a fluorine resin beforehand, and coating from the impregnated peripheral parts to the end surface of the unit cell with a coat layer made of a fluorine-resin adhesive. CONSTITUTION:A unit cell 5 is formed by interposing an electrolyte matrix 4 between an anodic and a cathodic gas electrode 2 and 3. Next, a coat layer 10 made of a fluorine-resin system adhesive is provided so that it extends from the end surface of the unit cell 5 to peripheral treated parts 9 of carbon papers, which are on the back surfaces of the electrodes 2 and 3. Here, since the peripheral parts 9 of the carbon papers are impregnated with an impregnation fluorine resin beforehand, the above adhesive is not absorbed by the parts 9, and the electrodes 2 and 3 are airtightly joined to gas-separating plates 8 securely during the time when the unit cells 5 are stacked. Since the periphery of the unit cell 5 is coated with a ?- shaped adhesive layer, the component members of the unit cell 5 are unified together, and assembly of a matrix-type fuel cell is facilitated. In addition, since the peripheries of the electrodes 2 and 3 and the matrix 4 are integrated with the adhesive layer 10 formed on the end surface of the unit cell 5, any gas is prevented from leaking from this part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a matrix type fuel cell, and special feature C: prevents reaction gas from leaking from the periphery of a cell stack and mixing of both gases.

The battery stack (1) of this type of battery is shown in Figure 1-2, with a hydrogen cathode (2) and an air anode (C; and one side-
It is composed of carbon gas separation plates (8) formed with a large number of hydrogen supply grooves (6) and air supply grooves (7), which are alternately stacked (two stacked).

In this battery bank (1112), hydrogen gas and air are removed.

The gas is supplied to each of the supply grooves (6) and (70) of the gas separation plate (8) through each manifold (not shown), and reacts through the ay1 material.

At this time, each reaction gas is connected to the gas separation plate (8) and each electrode wax 2).
(3) There was a risk that the reactant gas (especially 6 dihydrogen gas) would leak to the other air side through the same-side junction gap with (3), inside each electrode, and through the same-side joint between the electrode and the matrix.

As a measure to prevent such leakage, if a puffing material such as Cnibuhumin sheet is used at the peripheral joint of the non-separable plate (8) between the electrodes (2) and (3), the leakage from this part can be prevented. Although it can be prevented to a certain degree, C: Inside each electrode and 4
Leakage from the end face of the unit cell (5) cannot be prevented since the poles and the matrix are on the same side.

In addition, it is possible to contact the surrounding area of each electrode and gas separation plate with a T-pressure agent, but in general ≦
The back side of each of the two shields supports catalyst 1111+01 Y.
Since diffusion m (DI and Hiro carbon paper) is used, the adhesive applied in advance to the edge of the 4 # turtle is absorbed by the porous carbon paper, ensuring adhesion with the gas separation plate (8) ≦2 Line btL 72: There was a problem.

The present invention improves such an interposition point Y and provides a hermetic seal between each electrode and the carbon separation #L and C; and also provides a gas leakage from the unit cellu curve.

The following is an example of the present invention> Figure 2 and below <= Two explanation pages are also included.

1ijii, Ivi gas 4 poles (2) (3) Carbon paper on the back side (expanded layer tDI month 2 is as shown in Figure 5. After coating and impregnating fluorine 411 fat dispersion with 5-530-560
Heat sensitivity mv is carried out at ℃.

This processed @positive gas' 4 poles 421.31 C2 can solute matrix 14) is interposed to form a unit cell t5)) k, and then the back surface of the magnetic pole, that is, the peripheral treatment part of the carbon paper! From 91 to the end face of the unit cell, apply a fluororesin adhesive (for example, Eight Seal Perfumin, both trade names).
A coating layer (ll'l') is provided.

In this case, since the dovetail part (9) of the carbon paper is sealed in advance with impregnated fluororesin, there is no absorption of adhesive, and a reliable and airtight connection with the gas separation fjt83 is made when assembling the battery stack (1). be exposed.

In addition, since the unit cell (1) is coated with adhesive 1; U-shaped 1=A adhesive, the constituent members of the unit cell are unitized and assembly is simplified (2. The adhesive layer (I) applied to the area integrates both electrodes and the periphery of the matrix to prevent gas leakage from this area.

As described above, according to the present invention 6, the peripheral part 62 of the diffusion layer such as carbon paper constituting the back surface of the Yin-Yang gas electrode is impregnated with a fluororesin in advance, and from this impregnation, the end faces t-, Xt of the unit and cell are Since a coated layer of fluororesin adhesive was formed on the impregnated resin adhesive, absorption of the adhesive from the impregnated tip part was prevented and airtight bonding with the gas separation plate was ensured, and the impregnated resin N1
．． Since the adhesive resins are all fluororesin based, they have good adhesive strength and prevent reaction gas from seeking from between the gas partition plate and the unit cell. In addition, the unit cell has a coating layer C on one side, which allows both electrodes and the matrix to be integrated, making assembly into the battery stack simple, and also prevents gas leakage from the end face of the unit cell.

[Brief explanation of the drawing]

The first reason is that the conventional battery stack is a slope view of the water T section, Figure 2 is a slope view of the main part of the battery stack according to the present invention C2, and Figure 3 is Figure 2 N-
1541m is an enlarged Ilr plane view of the same as above, and figure $5 is a plane view of the electric field according to the present invention. 21... negative and positive gas electrodes, 4... electrolyte matrix, 5... unit cell, 6, 7... reaction gas supply grooves. 8... Gas separation plate, D.-carbon paper (diffusion layer) 9... Dark side impregnation part, 10... Adhesive coating layer. 358

Claims (1)

[Scope of Claims] (1) A battery in which unit cells consisting of negative and positive gas electrodes and an electrolyte matrix interposed between the electrodes, and (1) gas separation plates each having a reaction gas supply groove formed on the back surface of each electrode are stacked alternately. The periphery of the back of each electrode (; fluorine wood 11
The end face of the unit cell from the granite part to the penultimate impregnation 6
2I: Form a coated layer of fluororesin adhesive, 1il
A matrix type fuel cell characterized in that the unit cell and the gas separation plate are airtightly joined together by the coating layer on the first side of the Ell.