JPS6323620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a manifold mounting device for a matrix type fuel cell, and particularly to a countermeasure against gas leakage at the mounting seal surface in the stacking direction.

Prior Art As is well known, the battery stack 1 includes a unit cell in which an electrolyte matrix is interposed between negative and positive gas electrodes;
A terminal board and a heat-resistant insulating plate (none of them are shown) are stacked with carbonaceous gas separation plates (none of which are shown) that have cathode and reaction gas passages formed on each side.
It is tightened and fixed between the upper and lower contact plates 2 through . Further, the upper and lower contact plates 2, 2 each have an external terminal 3 extending from the terminal plate by penetrating the insulating plate and the contact plate.

Inlet and outlet manifolds 4, 4 for air supply and inlet and outlet manifolds 5, 5 for hydrogen supply are attached to each opposing side of the battery stack 1, respectively. A frame-shaped sealing member 8 made of heat-resistant and acid-resistant fluorine rubber is interposed between the manifold mounting collars 6 and 7, and is fastened to the upper and lower contact plates 2, 2 of the stack with bolts 9.

However, in this method, the only tightening points for the manifolds 4 and 5 are the upper and lower mounting flanges 6, 6, and the left and right mounting flanges 7,
7 cannot be tightened due to its structure, so the left and right mounting flanges cannot provide sufficient pressure against the seal member 8 in the stacking direction, 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. In the manifold, the mounting collar 7 in the stacking direction is deformed and a gap is created on the sealing surface. 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, resulting in a decrease in battery performance and life. This becomes a serious problem especially when the number of stacked cells increases to 200 cells or more.

DISCLOSURE OF THE INVENTION The present invention solves the above problem by reinforcing the sealing performance of the sealing surface in the stacking direction, which cannot be tightened with bolts. The angle members applied to the pair of mounting flanges adjacent to each other via packing are tightened and fixed with nuts that are screwed onto the screw bases attached to the upper and lower stack plates, and then attached to the pair of mounting flanges. The point is to press it.

Embodiment An embodiment of the present invention will be described with reference to the drawings, in which the same symbols as above are given to the relevant parts.

The respective manifolds 4, 5 are mounted by tightening and fixing the upper and lower mounting flanges 6, 6 to the upper and lower contact plates 2, 2 of the stack 1 with bolts 9 via the seal member 8, as in the conventional product.

Next, the angle material 11 is applied onto the pair of mounting flanges 7, 7 adjacent to each other at the corner portions in the stacking direction via the <-shaped heat-resistant packing 10 made of fluoro rubber. Bolt stands 13 having bolt through holes 12 are welded to both upper and lower ends of the angle member 11 extending from the stack 1, respectively. On the other hand, thread bases 15 of bolts 14 are welded near each corner on the upper and lower stack plates 2.

The angle pieces 11 applied to each corner of the stack are connected to the bolt base 13, the angle pieces 11 and <
The bolts 14 are tightened and fixed through the through holes of the character-shaped packing 10 to the screw base. In this way, the pair of mounting flanges 7, 7 at the corners in the stacking direction are pressed against the sealing surface by the angle member 11.

Effects According to the present invention, an angle material is applied via packing onto a pair of manifold mounting flanges adjacent to each other at the corners of a battery stack in the stacking direction, and the angle material is tightened to the upper and lower abutment plates of the stack. By fixing, the pair of mounting flanges are pressed, so the sealing performance of the sealing surface in the stacking direction, which cannot be tightened with bolts, is reinforced, preventing a drop in efficiency due to gas leakage and contact between the two gases. Damage to the cell due to heat generation can be prevented.

Further, since the reinforcement of the sealing surface in the stacking direction uses angle members applied over the corner portions, it has the advantage of being structurally simple and compact.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a battery stack equipped with a conventional manifold attachment device, FIG. 2 is a partial perspective view of a battery stack equipped with a manifold attachment device of the present invention, and FIG. 3 is a partial plan view of the same battery stack. FIG. 4 is a cross-sectional view of the main part of the same battery stack as above, and FIG. 5 is a perspective view of the main part of the angle member to which the bolt stand is attached. 1... Battery stack, 2... Upper and lower contact plates, 4, 5
...Manifold, 6,7...Manifold mounting collar,
8...Frame-shaped sealing member, 9...Bolt (for manifold installation), 10...<character-shaped packing, 11...
...Angle material, 13... Bolt stand, 14... Bolt (for attaching angle material), 15... Screw base.

Claims (1)

[Scope of Claims] 1. A fuel cell in which peripheral mounting flanges of a manifold are brought into contact with each side of a battery stack via a frame-shaped seal member, and the upper and lower mounting flanges are bolted and fixed to upper and lower contact plates of the stack, Angle members are applied via packing onto the pair of mounting flanges adjacent to each other at the corners in the stacking direction, and the angle members are tightened and fixed to the upper and lower contact plates to press the pair of mounting flanges. A fuel cell characterized by: 2. Claim 1, characterized in that the upper and lower ends of the angle member extending from the stack are tightened and fixed by bolts screwed into screw bases installed in the vicinity of the corners of the upper and lower contact plates. The fuel cell described. 3. The fuel cell according to claim 1 or 2, wherein a bolt stand is welded to the tightening portion of the angle member.