JPS58102469A - Cooled fuel cell - Google Patents

Abstract

PURPOSE:To decrease temperature difference in a cell by placing a carbon cooling plate in which a cooling air path is formed by embeding alumite treated squar pipes between a unit cell and a cell stack stacked with a gas separating plate. CONSTITUTION:A unit cell 2 comprising an anode gas electrode, a cathode electrode, and an electrolyte matrix and a carbon gas separating plate 5 which has reaction gas supply grooves 3 and 4 on its both surfaces are stacked mutually to form a cell stack 1. A carbon cooling plate 7 having a cooling air path 6 is placed every four or five cells to form a cooled fuel cell. An alumite treated aluminum square pipe 8 is embedded in an air path 6 of the cooling plate 7 by installing a separation rib 9. Since aluminum has large heat conductivity compared with carbon, cooling effect by the air path 6 is increased and efficiency of a cell is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to an air-cooled type 1 battery, and in particular improves the air cooling effect by improving the cooling plate C2, as well as reducing the temperature inside the battery.
The purpose is to reduce the amount of water and improve the lifespan of the four ponds.

The operating temperature of this kind of phosphoric acid fuel cell! island, iso'h~1
Although the temperature is 80°C, the temperature rises to over 200°C due to the reaction islands in the IE pond, so cooling is required. As for the air cooling method, part of the air Y supplied to the battery is supplied to the reaction air supply groove C, and the other part (approximately 7596 of the introduced AC power) is supplied to the air passage of the cooling plate (:
The method of supplying each and the reaction air are separated and used exclusively for cooling 9
There are ways to supply energy. In either case, the heat generated by the battery is also cooled by reaction air, but as the battery stack becomes larger, this alone is insufficient and most of the cooling is performed intensively using the cooling plate t-. Conventional 411Ik stack has an air inlet of 9m at a gas separation plate with a temperature of approximately 50°C.
The temperature on the exit side was approximately 180° C., and this temperature 1f1 caused non-uniform illumination characteristics and shortened battery life.

The present invention has been improved in the following points, and an embodiment thereof will be described with reference to the following figures.

The battery stack (1) of the general area 2 air-cooled air-cooled battery is S1
Figure 1; As shown in Figure 1, unit cylinders (21 and 1) consisting of negative and positive gas electrodes and an electrolyte matrix (none of which is shown) separating the anode and anode gas electrodes: each reactant gas (hydrogen and air), respectively.
A carbonaceous gas separation plate (5) with a supply groove (31 (4)
) and t alternately stacked 6 times, and a cooling air passage (61t'lrT) carbonaceous cooling plate (7) is interposed for every few cells, for example, 4 to S cells.

Furthermore, on the opposing surfaces of this stack (1), a pair of manifolds for supplying hydrogen gas and a pair of manifolds for supplying air (
(none of which are shown) are assembled into a battery in an airtight manner.

Now, as shown in Fig. 2, the conventional carbonaceous cooling plate (7) has its air passages (6) made of the same material, but the carbonaceous cooling plate (71 is No. !S@l) improved by the present invention. As shown, an air passage (6) is constructed by embedding an aluminum square pipe (8) treated with lumite in the square hole.Also, in order to increase the cooling surface area, a square pipe (8) is buried in the square hole.
1 to 2 partition tabs (9) are integrally formed.

The square pipe (8) may be buried by being press-fitted into the square hole of the carbonaceous cooling plate (71), or by being inserted between the grooves forming the square hole of the cooling plate divided into two parts.

7/L/L Niwam has thermal conductivity approximately 1000 times higher than conventional carbonaceous material (carbon), according to the same WLC partition flap.
90: Therefore, since the surface area is widened, the air passage (6
) has a good cooling effect and can be cooled with a smaller air volume than before, reducing blower power and improving fuel cell efficiency.

Also, since the thermal conductivity of the air passage is extremely good, the cooling plate +7'
The temperature i on the air inlet side and outlet side of the stack (1) through lv
This is shown in Figure 4, where the conventional product (dotted line) has a temperature of 150°C on the inlet side.01!418
0°C, but the product of the present invention (solid line) went from 4150°C to 165°C, with a difference of 1 m degree from 60°C to 15°C (=improved).

As described above, according to the present invention, the cooling air passage is constructed by drilling an alumite-treated aluminum square pipe in the carbonaceous cooling plate, so that the thermal conductivity is lower than that of the conventional one (1 = 1). Significant difference - The cooling effect is better than the second one, and the temperature on the air inlet side and the outlet side of the stack is reduced by 11tw, and it is possible to measure the same battery characteristics and battery life. Furthermore, there are special features such as the ability to further improve the cooling effect by forming a partition χ on the square pipe to increase the cooling surface area Y.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a battery stack that is the subject of the present invention, Figure 2 and! Figure s5 is a perspective view of a cooling plate with 9 air passages, 1Ji21V is the conventional product, and Figure 115 is the present invention 1...
Battery stack, 2... Unit cell, 5.4... Reactant gas (hydrogen and air) supply groove, 5... Carbonaceous gas separation plate, 6... Air passage, 7.7... Cooling plate, 8...
1 Luminiwam square pipe, 9... Partition block.

Claims (1)

[Claims] ■ Equipped with a battery stack in which the unit top ν and the elemental gases 1II41i and t are stacked alternately, and a carbonaceous cooling plate is interposed every several cells, and the cooling plate has a circular shape; Create a cooling air passage by burying the square pipes! An air-cooled fuel cell (1) characterized in that the square pipe is an integral part (C): The air-cooled fuel cell according to claim 1 is characterized in that the square pipe is integrally formed (C): the heat dissipation surface area is increased by the formed partition plate. Fee 1 Pond