JPS58197679A - Matrix type fuel cell - Google Patents

Abstract

PURPOSE:To make both expansion and contraction in a stack and a seal member absorbable by means of a frame body embracively holding the stach in an elastic manner as well as to cause the stack seal surface to keep up a good sealability at a specified clamping pressure at all times and simultaneously let the sealability in a manifold be also excellent, thus making a gas leakage nil. CONSTITUTION:Each frame body 10 comes into collision with each side of a cell stack 1 via each heat-resisting first seal member 13 but in this case adjacent frame bodies are coupled together with each other as each bolt 11 being set in one side frame body 10 is inserted into a through hole of each coupling piece 12 installed in the other side frame body 10 and, after a coil spring 14 and a flat washer 15 are inset in each of the bolts 11, each nut 16 is screwed in each bolt 11 and tightened in an elastic manner. Thus four frame bodies 10 are coupled together with each other and come closely to the periphery of the cell stack 1 via the seal member 13 so that these frame bodies 10 come into a state of pressing and embrancing the cell stack 1. Next, manifolds 4 and 5 apply their setting flanges 6 to each frame body 10 via each seal member 17 and are clamped tight by a screw 19 screwable in a tapped hole of each frame body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a matrix fl' kinetic battery, in which %Kta
This concerns the issue of attaching the manifold to the stack.

As is well known, the battery Smets 6 (1) consists of a unit cell consisting of a llj & anode cathode and an electrolyte matrix interposed therebetween, and a carbonaceous gas separation plate (both shown in the figure) with reaction gas passages formed on both sides. The upper and lower end plates (31+31) are brought into contact with the stack (2) with the terminal plate (not shown) via the terminal plate and the heat-resistant insulating plate (none of which are shown), and are tightened and fixed by a tightening member (not shown).

Each side of this battery stack (1) has an inlet side and outlet side gusset +41 tj+ for air supply, and an inlet side and outlet side gusset +5 for hydrogen gas supply.
1+51, but conventionally, as shown in Figure 2, a frame-shaped seal member (7) made of fluorine rubber is interposed between the battery stack (1) and the mounting collar (6) of the manifold, and the bolts are By (8), the end plate (31+) of the stack (1)
It was tightened to 31.

However, in the conventional method, the fixing point of the broom holder is the upper and lower end plates +
3113, the gusset mounting flange (6) cannot provide sufficient pressure against the one-way seal member (7), resulting in poor sealing performance, and only the top and bottom are fixed due to the difference in thermal expansion between the manifold and the stack. The attached mounting collar (6) is thermally expanded and deformed as shown in FIG. 3, and a gap is created in the center sealing surface in the stacking direction.

As a result, the efficiency decreases due to leakage of each reaction gas, and the battery is damaged due to heat generation due to contact between the two gases, causing a decrease in battery performance and life.

The present invention is intended to solve these problems, and an embodiment thereof will be described below, and the corresponding part i1: front part and the same number -1 are attached.

In the present invention, as shown in FIG. 4, a horizontal frame body [101] that matches the dimensions of each side of the battery stack (1) is used. This rigid frame α (H) is constructed by welding square pipes made of iron or stainless steel into a frame shape.On both sides of each frame σ■,
Two to six holes are welded to one end, and the same number of connecting ends having through holes are attached to the other end by welding. (See Figure 5) Each of these frames +
10 is brought into contact with each side of the battery stack (1) via a heat-resistant first sealing member α3, but in this case, the adjacent frame body is implanted in one frame body αG as shown in FIG. bolt t
After installing the coil spring d4I and the flat washer west on the other frame body (the IIK is connected by being inserted into the through hole of the connecting stopper installed on the bolt), screw this bolt 111 and the K nand L161. and tighten elastically. In this way, the four frames novFi are connected to each other and come into close contact with the periphery of the battery stack (1) via the seal member, as shown in FIG. .

Next, the manifold +41 +51 connects its mounting collar (6) to each frame body t via the second seal member Q71 similar to the above.
1G, and is tightened and fixed with a screw O1 that fits into the screw thread 08 of the frame body (10).In this case, the mounting direction Mt6+ in the stacking direction is also tightened to the frame body On with a screw D.

According to the present invention, the battery stack and the manifold are not directly fixed, but a rigid frame is applied to each side of the stack through a sealing member, and these frames are mutually connected by fixing devices (bolts and mounting pieces). The manifold is elastically tightened to enclose the stack, and then the mounting collar of the manifold is tightened and fixed to each frame via the second seal member.

Therefore, the expansion and contraction of the stack and the sealing member is absorbed by the frame that elastically surrounds the stack, so it is unrelated to the expansion and contraction of the frame and the seal member, and the stack sealing surface is always tightened to a certain level. Maintains good sealing performance under pressure. Also, gusset holt installation fRF! , with the intervention of a frame,
Since it is tightened to the frame body not only from the top and bottom but also from the sides, compared to the conventional method where it is fixed only to the top and bottom end plates of the stack, the sealability of the gusset bolt is also better, preventing gas leakage and improving battery performance and life. can be coupled.

[Brief explanation of the drawing]

1 to 6 show conventional fuel cells, and FIG.
A schematic plan view of an assembly of a battery stack and a main holder, a second figure is an exploded perspective view of the same as above, and FIG. 6 is a side view of the same as above. 4 and 5 show the fuel cell of the present invention, FIG. 4 is an exploded perspective view, and FIG. 5 is a plan view of essential parts showing the state of connection between frames. (1)...Battery stack, (3)...End plate, (4i
(41... Machihold for air supply h151151... Manifold for hydrogen gas supply, (6)... Machihold mounting collar, [11... Rigid frame, full... Bolt, ■
...Connecting piece, α31 (171...Sealing member, +
141...Spring, α5)...Flat washers,
αe... Nando. ~39°

Claims (1)

[Claims] ■ A rigid frame is brought into contact with each side of the battery stack via a sealing member, and these frames are elastically connected to each other.
- While holding the bistacks from the outer periphery, a second
A matrix fuel cell characterized in that a mounting collar of a manifold is tightened and fixed through a sealing member. ■ The front frame mutual link engages the bolt installed on one side with the connecting piece installed on the other side, and the spring is activated.