JPH0268865A - Set-up construction of fuel cell - Google Patents

Abstract

PURPOSE:To tighten a fuel battery without looseness with the entire faces thereof fastened under equal pressure by tightening cells with a fastening plate having a spherical recess in the middle of the bottom face of the plate via a retaining jig having a spherical projection in the middle of the upper face of the jig. CONSTITUTION:A retaining jig 19 having a spherical projection 18 in the middle of the upper face of the jig is put on a partition plate 9 and a fastening plate 21 having a spherical recess 20 in the middle of the lower face of the plate is put on the retaining jig 19 with the spherical projection 18 aligned with the spherical recess 20 with each other. Cells 8 are tightened between the fastening plate 21 and the base plate 17 at four corners with bolts 17, nuts 24 and pressure springs 23. Multiple ply of the cells 8 may be tightened with the entire faces thereof fastened under equal pressure and if the tightening bolts may be extended due to increase of temperature, the entire faces of the cells are subjected to equal pressure so that looseness may be prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a fuel cell assembly structure.

(Prior art) A cell constituting a fuel cell has an electrolytic layer 1 as shown in FIG.
is sandwiched between plates 2 of gas diffusion electrodes from both sides, and a carbon plate 5 having fuel (H2) passages 4 in parallel at regular intervals on both sides and a carbon plate 7 having air (02) passages 6 in parallel at regular intervals on both sides. , the passages 4 and 6 are arranged orthogonal to each other, and when a fuel cell is constructed with these cells 8, the cells 8 are placed on the base brake 11 via the partition plate 9, as shown in FIG. Compression pads 14 are mounted on a diagonally diagonally crossed bar 12 on the lower side with a presser plate 11 placed thereon, and attached to an upper diagonally crossed bar 13. is placed on the holding plate 10, and the ends of the upper and lower diepers ta and 12 are tightened with bolts 15 and nuts 16.

(Problem to be Solved by the Invention) By the way, in the fuel cell assembly structure as described above, when the ends of the upper and lower bars 13 and 12 are tightened with the bolts 15 and nuts 16, it is difficult to tighten them at four points using the compression pads. It is extremely difficult to apply pressure evenly to the entire surface of the cell 8. Therefore, when the bolt 15 expands due to temperature rise, the cell 8 loosens and the fuel (H2) passage 4 and air (02
) The airtightness of the passage 6 is impaired and contact resistance becomes non-uniform, resulting in a decrease in output.

Therefore, the present invention aims to provide a fuel cell assembly structure in which the cells stacked in multiple layers constituting the fuel cell are evenly tightened over the entire surface, and the cells do not loosen even if the tightening bolts stretch due to temperature rise. It is something to do.

(Means for Solving the Problems) In order to solve the above problems, the built-in structure of the fuel cell of the present invention is such that a large number of cells constituting the fuel cell are stacked on a base plate with partition plates interposed therebetween. A holding jig having a spherical protrusion at the center of the upper surface is placed on the holding jig, and a tightening plate having a spherical recess at the center of the lower surface is placed on the spherical protrusion of the holding jig at the part of the spherical recess. The four corners are tightened to the four corners of the base plate with bolts and nuts with pressure springs interposed therebetween, so that the laminated cell is fastened.

(Function) According to the built-in structure of the fuel cell of the present invention having the above configuration, a large number of stacked cells are tightened by a clamping plate having a spherical recess at the center of the lower surface via a holding jig having a spherical protrusion at the center of the upper surface. Because it is tightened, even if the tightening torque of the bolts and nuts at the four corners that tighten the clamping plate is slightly uneven, the clamping force of the entire clamping plate is concentrated from the spherical protrusion at the center of the top surface of the holding jig. It works. Therefore, the entire surface of a large number of stacked cells is pressed down with uniform surface pressure by the holding jig, eliminating unevenness. Furthermore, even if the bolt stretches due to a rise in temperature, since the pressure spring is provided between the nut and the holding plate, the holding plate will be held down by the pressing spring, and the cells will not loosen. Therefore, the fuel (H2) passage 4 and the air (
02) Since the airtightness of the passage is not impaired and the contact resistance remains unchanged, the output does not decrease.

(Example) An example of the built-in structure of the fuel cell of the present invention will be described with reference to FIG. Many through,
In this example, it is placed on the base plate 17 above the political situation layer 9, and a pyramid-shaped presser jig 19 having a spherical protrusion 18 at the center of the upper surface is placed on top of the base plate 17. A tightening plate 2 having a spherical recess 20 in the center with a radius of curvature larger than the radius of curvature of the spherical protrusion 18.
1 is placed in the spherical recess 20, and the four corners of the tightening plate 21 and the four corners of the base plate 17 are interposed between the bolts 22 and the pressing springs 23 that fit onto the bolts 22 on the upper surface of the tightening plate 21. The laminated cell is tightened with a nut 24.

In the fuel cell assembly structure of the embodiment configured as described above, even if there is some variation in the tightening torque of the bolts 22 and nuts 24 at the four corners that tighten the tightening plate 21, the holding jig 19 has a spherical protrusion at the center of the top surface. The tightening force from 18 to the entire tightening plate 21 acted in a concentrated manner. Therefore, the entire surface of a large number of stacked cells 8 is pressed down with uniform surface pressure by the holding jig 19, and there is no unevenness. Further, even if the bolt 22 was stretched due to a rise in temperature, the holding jig 19 was held down by the pressing spring 23, so the cell 8 did not loosen. Therefore, the airtightness of the fuel (H2) passage 4 and the air (02) passage of the cell 8 was not impaired, and the contact resistance was not increased, so that the output did not decrease.

(Effects of the Invention) As can be seen from the above explanation, according to the built-in structure of the fuel cell of the present invention, cells stacked in multiple layers can be tightened with uniform pressure on the entire surface, and even if the tightening bolts are stretched due to temperature rise. Uniform pressure is applied to the entire surface of the cell so that it does not loosen.Also, even if temperature unevenness occurs in the fuel cell and there is a difference in expansion locally, even pressure is applied to the entire surface of the cell.1. (0□) There is an effect that the airtightness of the passage is not impaired and the output is not reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partially cross-sectional perspective view showing an embodiment of the built-in structure of the fuel cell of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of cells constituting the fuel cell, and Fig. 3 FIG. 1 is a perspective view showing the built-in structure of a conventional fuel cell. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Yoshitomi Onoda Masahiro Watanabe

Claims (1)

[Claims] 1. A large number of cells constituting a fuel cell are stacked on a base plate with partition plates in between, and a holding jig having a spherical protrusion at the center of the upper surface is placed on top of the base plate. A tightening plate or a tightening bar having a spherical concave portion in the center is placed, and the four corners of this tightening plate or tightening bar are tightened to the four corners of the base plate with bolts and nuts with pressure springs interposed therebetween, thereby forming the laminated structure. A fuel cell built-in structure consisting of cells fastened together.