JPH087914A - Fuel cell assembly structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to relatively easily and reliably fix a fuel cell stack to a package frame. [Structure] A fuel cell stack, which is formed by stacking a plurality of unit cells 1, and a tightening plate 11 attached to both upper and lower ends thereof.
In a fuel cell assembly structure in which a and 11b are fastened together by a tie rod 14, a lower fastening plate 11
b is fixed to the mounting plate 25 via the insulating plate 12 with the insulating bolts 26, one end of the mounting plate 25 is bolted to the package base 20, and the other end of the mounting plate is slid onto the package base 20. The slide hook 31 mounted so as to be dynamically fixable was engaged and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell body assembly structure.

[0002]

2. Description of the Related Art Generally, in a fuel cell, hydrogen obtained by reforming natural gas, methane gas and the like and air as an oxidant are supplied into the fuel cell body and are supplied through an electrolyte such as phosphoric acid solution. An electrochemical reaction is performed to generate electric energy, which is a laminated structure (cell stack structure) in which one unit cell (single cell) having the power generation function as described above is laminated.

FIG. 6 is an exploded perspective view of a cell stack structure of a conventional fuel cell, in which a single cell 1 of a fuel cell body is
A fuel electrode 3 to which hydrogen is supplied in the direction of arrow A is arranged on one surface side of the matrix layer 2 holding the electrolyte, and an air electrode 4 to which air is supplied in the direction of arrow B is arranged on the other surface side. The fuel electrode 3 and the air electrode 4 are formed by laminating the grooved electrode base materials 5 and 6, respectively, and laminating the separator 7 on either one of the grooved electrode base materials 5 and 6. Each time a large number of the single cells 1 are stacked, the cooling material 8 is stacked to form a single sub-stack 9, and a large number of the sub-stacks 9 are stacked to form a cell stack 10.

As shown in FIG. 7, the cell stack 10 described above is used.
Tightening plates 11a and 11b are provided at the top and bottom of the
Is attached, and tightening stays 13 are attached to the tightening plates 11a and 11b via insulating plates 12, respectively.
The fuel cell stack 15 is integrated by tightening the tie rods 14 between the upper and lower tightening stays 13, 13.

On the four side surfaces of the cell stack 10,
As shown in FIG. 8, a pair of hydrogen gas manifolds 16a and 16b and a pair of air gas manifolds 1 so that hydrogen gas and air gas can flow in directions orthogonal to each other.
7a and 17b are attached. That is, a pair of hydrogen gas manifolds 16a and 16b for supplying and exhausting hydrogen gas are attached to the side surfaces of the cell stack 10 which are opposed to each other, and the other opposite to each other orthogonal to the surface on which the hydrogen gas manifolds 16a and 16b are attached. On the side to
A pair of air gas manifolds 17 for supplying and exhausting air gas
a and 17b are attached. A gasket 18 is provided on the contact surface between each gas manifold and the cell stack 10 in order to prevent problems such as gas explosion and efficiency reduction due to leakage of hydrogen gas.

FIG. 9 is a view showing a fixed state of the battery stack 15 on the package base 20. The front side of the lower tightening stay 13 is fixed to the package base 20 by a bolt 21. The periphery of the two locations on the back side is filled with piping and package structural parts 22, and since there is no sufficient working space and hands cannot be accessed, the tip of the tightening stay 13 is engaged with the taper stopper 23.

[0007]

However, when assembling the battery stack 15, there is a problem in that it is difficult to work the tip of the tightening stay 13 into the taper stopper 23. In other words, when fixing the fuel cell body to the package base, it is necessary to incline and slide the cell body in order to fit it in the stopper while the back side is not visible, and workability is very poor, and it is not completely fixed. It is difficult to confirm that the

In view of the above points, the present invention has an object of providing an assembly structure in which the operation of fixing the fuel cell stack to the package base can be performed relatively easily and the fixing can be performed reliably. To aim.

[0009]

According to the present invention, a fuel cell laminated body formed by laminating a plurality of unit cells is integrated with a fastening plate attached to both upper and lower ends thereof by tie rods. In the battery assembly structure, the lower tightening plate is fixed to the mounting plate with an insulating bolt through the insulating plate, one end of the mounting plate is bolted to the package base, and the other end of the mounting plate is fixed to the package. It is characterized in that it is engaged and fixed by a slide hook which is slidably fixed to the frame.

[0010]

[Function] The insulating plate between the lower tightening plate and the mounting plate receives the same large area as the unit cell, so the surface pressure is low and it has a stable structure. Since they are integrated with the insulating bolts, there is a concern that they will shift due to heat cycles etc. Disappears. Further, for fixing the mounting plate and the package pedestal on the front end side, the battery stack can be securely fixed to the gantry by sliding the slide hook and engaging the hook with the end edge portion of the mounting plate.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a fuel cell stack 15 according to the present invention.
FIG. 3 is a perspective view showing a state of attachment to the package pedestal 20. The mounting plate 25 is attached to the lower tightening plate 11b via the insulating plate 12, and the mounting plate 25 is fixed on the package pedestal 20. .

That is, FIG. 2 is an enlarged cross-sectional view of the mounting plate portion. The mounting plate 25 is fixed to the lower tightening plate 11b via the insulating plate 12 so as to be integrated with the insulating bolts 26 and the insulating washers 27. ing. Further, a pair of left and right elongated holes 30 extending in the front-rear direction are formed on the upper surface of the package base 20 on the rear side, and slide hooks 31 are slidably attached to the elongated holes 30 as shown in FIG. There is.

As shown in FIG. 4, the slide hook 31 has a recess 31a formed on the front side thereof for engaging with the rear edge of the mounting plate 25 placed on the package frame 20. A taper portion 31b that is inclined upward toward the opening side is formed on the upper surface of the recess 31a. Further, the slide hook 31 is provided with a side guard 31c on one side thereof which engages with the rear end side surface of the mounting plate 25, and a bottom surface 31c1 of the side guard 31c slides on the upper surface of the package frame 20. The bottom wall portion 31d of the slide hook 31 is formed on the package frame 20.
It can be slid on the inner surface of the.

By the way, the slide hook 31 has
A stud 32 projecting forward is projectingly provided, and a tip end portion of the stud 32 is projected forward from a front wall portion of the package frame 20, and a nut 33 is screwed to the projecting portion.

On the other hand, a bolt hole 34 for fixing the front side of the mounting plate 25 is formed on the front side upper surface of the package frame 20. When the fuel cell stack 15 is mounted on the package base 20, the fuel cell stack 15 is placed on the package base 20 and the front side of the mounting plate 25 fixed to the lowermost part thereof. Bolt 35 for inserting the bolt into the bolt hole 34
It is fixed to the package base 20 by. Then, when the nut 33 screwed to the stud 32 is tightened, the slide hook 31 moves forward (on the right side in FIG. 2), and the taper portion 31b thereof is mounted on the mounting plate 2
5 abuts on the rear edge of the mounting plate 25, and the tapered portion 31b causes the rear portion of the mounting plate 25 to move to the package mount 20.
It is pressed and fixed on top.

As described above, the mounting plate 25
The back side of the nut 3 is attached to the stud 32 that is connected to the slide hook 31 at a location close to the fuel cell body where workability is good.
By tightening 3 to move the slide hook 31 toward you, the mounting plate 2
5 can be fixed to the package mount 20, and the fuel cell main body can be assembled on the package mount 20 with good workability and reliability. At this time, the slide hook 31
The side guide 31c engages with the side surface of the mounting plate 25 to prevent its lateral movement.

Further, since the insulating plate 12 is applied to the entire surface of the tightening plate 11b and fixed by the insulating bolts 26, it is not mechanically slid or subjected to an excessive compressive load, and the battery body is insulated from the ground. Can have a high mechanical and electrical reliability for a long period of time, and at the same time, can have a structure with a small height and width dimension.

FIG. 5 is a perspective view of the tightening plate 11a (11b). The tightening plate 11a is formed by cutting a flat steel plate with high precision, and the square plate support ears 36 are provided at the four corners.
Is welded. Therefore, the machining range can be almost eliminated, and the structure can be simple.

[0020]

As described above, according to the present invention, when it is installed on the package base of the fuel cell body, the slide hook is slid by operating it at a place with good workability such as the front side. The slide hook can be engaged with the edge portion of the mounting plate to hold the mounting plate in pressure contact with the package base. Therefore, the workability of the assembling work can be greatly improved, and moreover, the fixing and assembling can be surely performed.

Further, since the insulating plate is abutted and fixed over the entire surface of the tightening plate, mechanical reliability does not occur due to sliding or excessive compressive load.

[Brief description of drawings]

FIG. 1 is a diagram showing a mounting state of a fuel cell stack of the present invention on a package frame.

FIG. 2 is a sectional view of a mounting plate portion according to the present invention.

FIG. 3 is a partial perspective view of a mounting plate.

FIG. 4 is a perspective view of a slide hook.

FIG. 5 is a partial perspective view of a tightening plate.

FIG. 6 is a perspective view showing a conventional cell stack structure.

FIG. 7 is a partial cross-sectional view showing a conventional fuel cell stack.

FIG. 8 is a partial cross-sectional view of a conventional fuel cell stack viewed from the bottom.

FIG. 9 is an explanatory view of a fixing means for a conventional fuel cell stack.

[Explanation of symbols]

 1 Single Cell 2 Matrix Layer 3 Fuel Electrode 4 Air Electrode 8 Cooling Plate 10 Cell Stack 11a, 11b Tightening Plate 12 Insulating Plate 13 Stay 15 Fuel Cell Laminate 20 Package Stand 25 Mounting Plate 26 Insulation Bolt 30 Long Hole 31 Slide Hook 31b Taper Part 32 Stud 33 Nut

Claims (4)

[Claims] 1. A fuel cell assembly structure in which a fuel cell stack formed by stacking a plurality of unit cells is integrated by tightening fastening plates attached to the upper and lower ends thereof with tie rods. The plate is fixed to the mounting plate via an insulating plate with insulating bolts, and one end of the mounting plate is bolted to the package base, and the other end of the mounting plate is slidably fixed to the package base. A structure for assembling a fuel cell, characterized in that it is engaged and fixed by the slide hooks. 2. A stud inserted through a package base is connected to the slide hook, and the slide hook is slid by the rotation of a nut screwed to the stud. The fuel cell assembly structure according to claim 1, wherein: 3. The slide hook is slidably mounted in a hole in the upper surface of the package base, and one side surface of the slide hook is provided with a side guide that engages with one side surface of the mounting plate. The fuel cell assembly structure according to claim 1 or 2, characterized in that. 4. The fuel cell assembly structure according to claim 1, wherein an inclined surface facing upward is formed on a surface of the slide hook facing the mounting plate.