JP3111124B2 - Fuel cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell laminating section in which a plurality of plate cells are juxtaposed in a stacked state in a state of being electrically connected in series. A terminal portion for extracting electric power from an end in the stacking direction is provided between the end surface in the stacking direction of the cell stacking portion and the protective member provided so as to cover the entire end surface and having electrical insulation. Related to fuel cells.

[0002]

2. Description of the Related Art In such a fuel cell, a cell and a protective material are made of ceramic or the like, and a terminal portion is made of a metal or the like having excellent conductivity. Therefore, when the temperature of the fuel cell rises due to operation, the difference in the coefficient of thermal expansion between the cell and the protective material and the terminal is large. There is a possibility that internal stress is generated due to a difference in thermal expansion between the material and the terminal portion, and the cell and the protective material are damaged. Therefore, conventionally, in order to reliably prevent breakage of the cells and the protective material, the terminal portion is sandwiched between the end surface in the stacking direction and the protective material in the cell stacking portion, and between the end surface and the protective material. Had been arranged.

[0003]

However, in the prior art, the terminal portion is simply held in a state of being sandwiched between the end face in the stacking direction of the cell stacking portion and the protective material.
Since the holding state of the terminal portion is unstable, for example, the contact state between the terminal portion and the end face is deteriorated due to an inclined state or vibration in the installation state of the fuel cell, and the contact resistance is increased, and as a result, However, there is a problem that the internal resistance of the fuel cell increases. In addition, since the terminal portion is covered with the protective material, the operation of connecting a lead wire for extracting power to the terminal portion has been complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned conventional problems, to reduce the internal resistance and to improve the performance, and to further improve the performance of the lead wire for extracting power. An object of the present invention is to provide a fuel cell whose connection operation is simple.

[0005] In a first characteristic configuration of the fuel cell according to the present invention, the protection member is located at a peripheral portion of the end face.
Holds at a distance from the end face with a spacing member
Is, the terminal portion, the end face current collecting portion with a and conductivity is provided in a state of contact with the other end one end connected to the collector portion between the protective member and the end face Is provided so as to protrude from the through-hole formed in the protective material to the outside of the protective material, and includes a conductive rod-shaped body and a fixing portion for fixing the rod-shaped body to the protective material. It is,
The current collector is connected to the rod and has conductivity.
Plate-shaped body, and provided between the plate-shaped body and the end face.
And a flexible conductive material .

A second characteristic configuration is that the fixing portion is constituted by a male screw portion provided on an outer peripheral portion of the rod-like body and a nut member screwed to the male screw portion. .

[0007]

[0008]

According to the first feature, the space holding member secures the cell.
Held in the cell stack with a gap from the end face of the stack
The rod-shaped body connected to the plate-shaped body
By fixing with the fixing part, the plate-shaped body
To the end face of the part
The position is fixed, and in this state, the end faces of the plate-shaped body and the cell laminated portion
Since the flexible conductive material is provided between, for example,
Regarding the tilting state and vibration in the installation state of the fuel cell,
Of the plate-like body and the cell using the flexibility of the flexible conductive material
Uniform electrical connection over the entire surface with the end face of the layer
be able to. Moreover, even if the plate is fixed to the protective material, only a part of the plate is fixed to a part of the protective material via the rod , and furthermore, the cell and the cell
Flexible conductive material is provided between the end face of the layer and
Thus, it is possible to effectively prevent the generation of internal stress due to a difference in thermal expansion between the cell and the protective material and the terminal portion. In addition, since the end of the rod-like body protrudes outward of the protective material, a lead wire for extracting power can be connected to the protruding end.

According to the second characteristic configuration, the current collector can be easily fixed to the protective material by screwing the nut member to the male screw provided on the outer peripheral portion of the rod.

[0010]

[0011]

According to the first characteristic configuration, since the generation of internal stress can be prevented, the breakage of the cells and the protective material can be reliably prevented, and the plate-like body and the cell laminated portion can be prevented. uniformly electrically entire surface and an end face of the stacking direction in
Can be connected to the end face of the cell stack and the terminal
The connection resistance with the unit can be reduced, and the internal resistance of the fuel cell can be reduced. In addition, since the lead wire for extracting power can be easily connected to the end of the rod-like body protruding outwardly of the protective material, the connecting operation of the lead wire for extracting power can be simplified. It became so.

Further, according to the second characteristic configuration, the work of arranging the terminals can be further simplified.

[0013]

[0014]

An embodiment will be described below with reference to the drawings. First, the structure of the cell C of the fuel cell will be described with reference to FIG.

On one surface of the plate-shaped solid electrolyte layer 1 having a rectangular planar shape, a film-shaped or plate-shaped solid electrolyte layer 1 is formed with an electrolyte layer exposed portion 1a extending over the entire side edge on each of both side edges. Oxygen electrode 2 is integrally adhered, and a film-shaped or plate-shaped fuel electrode 3 is integrally adhered to the other surface over the entire surface or almost the entire surface. The planar shape for obtaining the electromotive force is a rectangular three-layer plate.

The solid electrolyte layer 1 is made of tetragonal ZrO ₂ in which about 3 mol% of Yt is dissolved, and other suitable materials. The oxygen electrode 2 is made of LaMnO ₃ and other suitable materials. The fuel electrode 3 is made of a cermet of Ni and ZrO ₂ , or any other suitable material.

A plate-like portion 4a, a pair of band-like protrusions 4b located at both ends of the plate-like portion 4a, and a plurality of ridges 4c located between the pair of band-like protrusions 4b are integrally formed. A pair of band-shaped protrusions is formed on the formed conductive separator 4 in a state where the plate-shaped portion 4a faces the oxygen electrode 2 at a distance and each of the plurality of ridges 4c is in contact with the oxygen electrode 2. 4b is attached to each of the exposed portions 1a of the electrolyte layer, thereby being provided on the side facing the oxygen electrode 2.

Thus, the conductive separator 4 and the oxygen electrode 2 are connected in a conductive state, and a plurality of groove-shaped oxygen-containing gas flow paths s are formed between the pair of band-shaped projections 4b. Further, in the flow direction of the oxygen-containing gas flow path s, the periphery of the conductive separator 4 and the three-layer plate-like body is defined as a fuel gas flow path f which is separated from the oxygen-containing gas flow path s. One of the openings formed on the opposite side surfaces of the cell C by the conductive separator 4 and the three-layer plate-like body is one of an oxygen-containing gas channel inlet si and the other is an oxygen-containing gas channel outlet so. There is.

The conductive separator 4 partitions the oxygen-containing gas flow path s and forms the oxygen electrode 2.
And also serves as a cell terminal for deriving a current from the cell. By contacting the plurality of protrusions 4c with the oxygen electrode 2, the cross-sectional area of the electric passage from the oxygen electrode 2 to the conductive separator 4 as a cell terminal is increased.

The conductive separator 4 is made of a conductive ceramic material such as LaCrO ₃ having excellent resistance to oxidation and reduction.

Next, with reference to FIGS. 2 to 4, a description will be given of a specific configuration of the cell stacked unit NC in which a plurality of cells C configured as described above are electrically connected in series and juxtaposed in a stacked state.

In the cell C, each of the pair of side surfaces on which the oxygen-containing gas flow path s is closed by the conductive separator 4 has a first thickness substantially equal to that of the cell C and longer than the cell C.
The columnar body 5 and the second columnar body 6 are brought into close contact with each other,
The third columnar body 7 and the fourth columnar body 8 each having the same thickness and longer than the cell C are brought into close contact with each of a pair of edges of the cell C in which the oxygen-containing gas flow path s is opened, And the first
The both ends of the third columnar body 7 and the fourth columnar body 8 are overlapped and adhered to both ends of the columnar body 5 and the second columnar body 6, respectively. Further, the cell C and the first columnar member 5 and the second columnar member 6 are repeated on the third columnar member 7 and the fourth columnar member 8. Thus, a plurality of cells C are juxtaposed in a stacked state with an interval serving as a fuel gas flow path f between adjacent cells C.

At the end of the cell C on the side of the oxygen-containing gas flow path inlet si, the space between the side surface of the cell C and the first and second columnar bodies 5, 6 and the edge of the cell C and the An adhesive 9 having heat resistance and electric insulation is filled between the four pillars 8 to prevent the oxygen-containing gas from leaking to a portion other than the oxygen-containing gas flow path s.

The flexible conductive material 10 formed between the adjacent cells C and C is formed so as to allow a gas to flow therethrough. That is, adjacent cells C,
C are connected to each other in a conductive state.

The pillars 5, 6, 7, 8 are made of a ceramic material having excellent heat resistance and electrical insulation. The flexible conductive material 10 is made of a Ni felt-like material having excellent heat resistance and reduction resistance, and other suitable materials.

The fuel gas passage f will be specifically described. A concave portion 7A is formed in the third columnar body 7 so as to form an opening between the third columnar body 7 and the fuel electrode 3 of the cell C. Also, openings formed between the first pillars 5 and 5 adjacent in the stacking direction of the cells C, and the second pillars 6 and 6 adjacent in the stacking direction.
Each of the openings formed between them is provided with a flow path inlet forming member 11 in a state where an opening is formed on the oxygen-containing gas flow path inlet si side in the opening. Each of the openings formed by the flow path inlet forming member 11 is a fuel gas flow path inlet fi, and each of the recesses 7A is a fuel gas flow path outlet fo. That is, the fuel gas flow path f is configured so that the fuel gas flows from the fuel gas flow path inlets fi on both sides to the fuel gas flow path outlet fo in a bent flow state through the flexible conductive material 10. .

As described above, the cell laminated portion NC is constituted.

Next, the configuration of the cell assembly U will be described with reference to FIGS. Each of the two end faces M in the stacking direction in the cell stacking section NC is located at the peripheral edge of the end face M.
Then, the third columnar body 7 and the fourth columnar body 8 are provided in the same manner as described above, and the base plate 12 is placed on the third columnar body 7 and the fourth columnar body 8 so as to cover the entire end face M in the laminating direction. To the base plate 12, the third columnar body 7 and the fourth columnar body.
At 8, it is kept in a state of being spaced from the end face M in the laminating direction.
I have. A through hole 1 is provided at a substantially central portion of the base plate 12.
2A is formed. That is, the base plate 12 serves as a protective material.
Correspondingly, the third columnar body 7 and the fourth columnar body 8 are spacing members.
Is equivalent to The base plate 12 is made of the same material as the third columnar body 7 and the fourth columnar body 8.

Between the end face M and the base plate 12, a terminal section 20 for taking out electric power from the end of the cell stacking section NC in the stacking direction is provided. The terminal unit 20 will be described. The terminal portion 20 is provided between the end surface M and the base plate 12 in contact with the end surface M, and has a conductive current collector A, and has one end connected to the current collector A and the other end connected. Rod-shaped member 2 provided with a conductive member protruding from the through hole 12A formed in the base plate 12 to the outside of the base plate 12 and having conductivity.
1 and a fixing portion B for fixing the rod 21 to the base plate 12.

The fixing part B will be described. The fixing portion B is a male screw portion 21A formed on the outer peripheral portion of the rod-shaped body 21.
And a nut member 22 screwed to the male screw portion 21A.

The current collector A will be described. The current collecting part A is connected to the rod-shaped body 21 and is a plate-shaped body 2 having conductivity.
3 and a flexible conductive material 24 provided between the plate 23 and the end face M. The flexible conductive material 2
4 is formed in a shape that allows gas flow.

The rod 21, the nut member 22, and the plate 2
3 is made of a material having excellent heat resistance and conductivity, for example, Ni, and the flexible conductive material 24 is made of a material having excellent heat resistance and conductivity, for example, a felt material of Ni.

As shown in FIG. 3 and FIG.
C, a wind tunnel 13 having one side opening is connected to the side of the installation side of the oxygen-containing gas flow path inlet si in an airtight state with the opening facing, and the oxygen-containing gas flow path outlet so and the fuel gas On the side surface on the installation side of the flow path outlet fo, a wind tunnel 14 having one side opening is connected in an airtight state with the opening facing. Accordingly, the oxygen-containing gas supply unit Ks that communicates the inside of the wind tunnel 13 with each of the oxygen-containing gas flow path inlets si.
The gas discharge portion H serving as both an oxygen-containing gas discharge portion Hs communicating the inside of the wind tunnel 14 with each of the oxygen-containing gas flow passage outlets so and a fuel gas discharge portion Hf communicating with each of the fuel gas flow passage outlets fo. There is. The gas discharge section H also functions as a combustion chamber for burning the exhausted oxygen-containing gas discharged from each of the oxygen-containing gas flow path outlets so and the exhausted fuel gas discharged from each of the fuel gas flow path outlets fo. .

The cell assembly U is configured as described above.

Next, with reference to FIGS. 5 to 7, a description will be given of a specific configuration of a fuel cell in which the cell assembly U configured as described above is provided inside the box-shaped body 31. FIG.

The cell assembly U is provided on the bottom 31B of the box 31.
Are provided, and the cell assembly U is mounted on the four mounting portions 40 in a state where the stacking direction thereof is aligned with the vertical direction. . Box 31
Is made of a metal such as stainless steel.

A heat insulator 32 is provided so as to surround the cell assembly U. Further, a gap 33 is formed in the heat insulating material 32 so as to face each of the fuel gas flow path entrances fi in the cell assembly U and communicate with the through hole 31C formed in the bottom 31B of the box 31. It is. The gap 33 serves as a fuel gas supply section Kf that communicates with each of the fuel gas flow path inlets fi. Further, the fuel gas supply pipe 34 is provided in the through hole 31C.
Are connected. The heat insulating material 32 is made of a material having excellent heat resistance and electrical insulation, for example, a ceramic material.

One end of the inner oxygen-containing gas supply pipe 35 is
The other end is connected to the outer oxygen-containing gas supply pipe 36 via the communication connection part 50 while being connected to the wind tunnel 13 in a state of communicating with the oxygen-containing gas supply part Ks. Further, one end of the inner exhaust pipe 37 is connected to the exhaust portion H so that the
4, and the other end thereof is connected to the outer exhaust pipe 38 through the communication connection part 50. Communication connection part 50
Are the inner oxygen-containing gas supply pipe 35 and the outer oxygen-containing gas supply pipe 36 while keeping the inside of the box 31 airtight.
And a function of connecting the inner exhaust pipe 37 and the outer exhaust pipe 38 to communicate with each other. Inner oxygen-containing gas supply pipe 3
The outer pipe 5 and the inner exhaust pipe 37 are made of a material having excellent heat resistance and electrical insulation, for example, a ceramic material. The outer oxygen-containing gas supply pipe 36 and the outer exhaust pipe 38 are made of metal such as stainless steel.

The ends of the rods 21 of the terminal portions 20 provided at the upper end and the lower end of the cell stacking portion NC, respectively,
0, while keeping the inside of the box-shaped body 31 airtight and electrically insulated from the box-shaped body 31,
1 is penetrated outside. Further, a lead wire 39 for extracting power is connected to the penetrating end of each of the rods 21.

That is, the oxygen-containing gas S is supplied to the oxygen-containing gas flow path s of each cell C through the outer oxygen-containing gas supply pipe 36, the inner oxygen-containing gas supply pipe 35, and the oxygen-containing gas supply section Ks. The fuel gas F is supplied to the fuel gas supply pipe 3
4 and the fuel gas supply section Kf to supply the fuel gas flow path f of each cell C, and the electric power generated in the cell stack section NC by the oxygen-containing gas and the fuel gas is taken out from the upper and lower terminal sections 20, Further, the exhausted oxygen-containing gas S ′ discharged from each oxygen-containing gas flow path s and the discharged fuel gas F ′ discharged from each fuel gas flow path f are burned in a gas discharge portion H, and the combustion heat In addition to heating the cell stacking portion NC, the exhaust gas containing the exhausted oxygen-containing gas and the exhausted fuel gas is discharged to the outside through the inner exhaust pipe 37 and the outer exhaust pipe 38.

Next, the mounting section 40 will be described with reference to FIG. The mounting section 40 is provided at the bottom 31 of the box-shaped body 31.
A bolt 42 which is inserted into the through hole 41 formed in B in an airtight manner from the outside and is fixed to the bottom 31B by welding or the like.
, A nut member 43 screwed to the bolt 42, and a tubular body 44 mounted on the nut member 43. The cell assembly U is mounted on the tubular body 44 of each of the four mounting sections 40. In addition, the nut member 43
The mounting height and the inclination of the cell assembly U are adjusted by each. The tubular body 44 is made of a material having excellent heat resistance and electrical insulation, for example, a ceramic material.

Next, the communication connecting section 50 will be described with reference to FIG.

A cylindrical body 52 having a flange 52A is inserted into a through-hole 51 formed in the bottom 31B of the box-shaped body 31 so that the space between the inner peripheral part of the through-hole 51 and the outer peripheral part of the cylindrical body 52 is airtight. It is inserted through the inside of the box 31 and is fixed to the bottom 31B. A cylindrical body 52, a bellows-like cylindrical body 53 that can be deformed in the axial direction and the radial direction, a cylindrical body 54, and an outer oxygen-containing gas supply pipe 36 (or an outer exhaust pipe 38) are connected to each other in the stated order. The inner oxygen-containing gas supply pipe 35 (or the inner exhaust pipe 37) is inserted into the cylinder 52, the bellows-shaped cylinder 53 and the cylinder 54 so as to be movable in the axial direction and the radial direction. An annular seal member 55 having elasticity is disposed between the inner peripheral portion of the cylindrical body 54 and the outer peripheral portion of the inner oxygen-containing gas supply pipe 35 (or the inner exhaust pipe 37).

As the temperature rises during operation of the fuel cell, the box 31, the inner oxygen-containing gas supply pipe 35 (or the inner exhaust pipe 37) and the outer oxygen-containing gas supply pipe 36
(Or the outer exhaust pipe 38) The generation of stress due to the difference in thermal expansion between them is avoided by the elastic deformation of the bellows-like cylindrical body 53 and the annular seal member 55. That is, the communication connecting portion 50 is constituted by the cylindrical body 52, the bellows-shaped cylindrical body 53, the cylindrical body 54, and the annular seal member 55. The cylindrical body 52, the bellows-shaped cylindrical body 53, and the cylindrical body 54 are made of metal such as stainless steel, and the annular seal member 55 is made of a material having heat resistance and electrical insulation, for example, silicon rubber.

Next, based on FIG.
Is added. FIG. 10 shows the cell stacking section NC
Although the airtight penetrating part 60 of the terminal part 20 provided at the lower end part of the cell stack part is shown, the terminal part 20 provided at the upper end part of the cell stacked unit NC has the same configuration.

A bottomed cylindrical body 62 having a through hole 62A at the bottom and having a female thread at the inner periphery is inserted into a through hole 61 formed at the bottom 31B of the box-shaped body 31. The space between the peripheral portion and the outer peripheral portion of the cylindrical body 62 is inserted in an airtight state and fixed to the box-shaped body 31. A cylindrical body 63 having a large-diameter portion 63A at the center in the axial direction and small-diameter portions 63B at both ends in the axial direction is fitted inside the through-hole 62A of the bottomed cylindrical body 62 with the small-diameter portion 63B in an airtight state. Thereby, it is arrange | positioned inside the cylinder body 62 with a bottom. A cylindrical body 64 having an external thread portion formed on the outer peripheral portion to be screwed to the female thread portion of the bottomed cylindrical body 62.
Is screwed to the female screw portion of the bottomed cylindrical body 62 in a state where an elastic sealing member 65 is interposed between the end face and the end face of the large diameter portion 63A of the cylindrical body 63, Thus, the bottomed cylindrical body 62, the cylindrical body 63, and the cylindrical body 64 are integrally fixed. The rod-shaped body 21 is inserted into the cylindrical body 63 and the cylindrical body 64 movably in the axial direction and the radial direction. An annular sealing member 66 having elasticity is provided between the inner peripheral portion of the cylindrical body 63 and the outer peripheral portion of the rod-shaped body 21.

The stress generated due to the difference in thermal expansion between the box-shaped body 31 and the rod-shaped body 21 as the temperature rises during the operation of the fuel cell is determined by the elastic deformation of the annular sealing member 66. To avoid it. That is, the hermetically sealed through portion 60 is constituted by the bottomed cylindrical body 62, the cylindrical body 63, the cylindrical body 64, and the annular seal members 65 and 66. Bottomed cylinder 62
The cylindrical body 63 is made of a metal, the cylindrical body 63 is made of a material having electrical insulation, for example, a ceramic material, and the annular seal members 65 and 66 are made of a material having heat resistance and electrical insulation, for example, silicon rubber. Consists of

[Another embodiment] Next, another embodiment will be described. In the above-described embodiment, the case where the fixing portion B is constituted by the male screw portion 21A formed on the outer peripheral portion of the rod-shaped body 21 and the nut member 22 screwed to the male screw portion 21A is exemplified. May be made of a heat-resistant adhesive.

[0049]

[0050]  In the above embodiment, the fuel gas is
Is provided with the heat supply section Kf.
Provide an oxygen-containing gas supply section Ks or a gas discharge section H
You may do it.

[0051]  Insulator 32 allows gas flow
Material, for example, porous ceramic material or glass
It may be formed of wool. In this case, as in the above embodiment,
Thus, the heat insulating material 32 functions as the fuel gas supply unit Kf.
It is not necessary to form the gap 33 for the clearance.

[0052]  As shown in FIG. 11 and FIG.
Communicates with the inlet U of the oxygen-containing gas flow path s to the integrated body U
Of the oxygen-containing gas supply unit Ks
An oxygen-containing gas discharge Hs communicating with each of the outlets so
Fuel gas supply unit communicating with each of the inlets fi of the raw gas flow path f
Kf and the fuel communicating with the outlet fo of the fuel gas flow path f
The gas discharge section Hf may be provided separately. in this case,
As in the above embodiment, a recess 7A is formed in the third columnar body 7.
In addition, the flow path inlet forming member 11 is not provided. Therefore,
Formed between the first columnar bodies 5, 5 adjacent in the stacking direction of the cells C
Of the second pillars 6 and 6 adjacent to the opening to be laminated in the laminating direction.
Either one of the openings formed between
The inlet fi and the other are the fuel gas channel outlet fo. Soshi
And the oxygen-containing gas supply section Ks and the oxygen-containing gas discharge section H
s, the fuel gas supply section Kf and the fuel gas discharge section Hf
Is provided in the heat insulator 32. In the figure
71 is a wind for forming the oxygen-containing gas supply section Ks.
The body, 72, is a wind for forming the oxygen-containing gas discharge portion Hs.
73 is a wind tunnel for forming the fuel gas discharge portion Hf.
Show. 74 is an inner oxygen-containing gas supply pipe, and 75 is an inner oxygen-containing gas supply pipe.
Oxygen-containing gas exhaust pipe, 76 indicates inner fuel gas exhaust pipe
You. Although not shown, the inner oxygen-containing gas supply pipe 74,
Inner oxygen-containing gas exhaust pipe 75 and inner fuel gas exhaust pipe 7
6 are connected to each other at the same communication connection portion 50 as in the above embodiment.
Side oxygen-containing gas supply pipe, outer oxygen-containing gas exhaust pipe and outside
Are connected to the respective side fuel gas exhaust pipes. Not shown
However, the fuel gas supply unit Kf is provided in the heat insulator 31.

[0053]  In the above embodiment, the conductive separator 4
Is provided on the side of the three-layer plate-shaped body facing the oxygen electrode 2 to constitute the cell C.
FIG. 13 and FIG.
As shown in FIG.
The same structure as in the above embodiment is provided on the side of the layered plate facing the fuel electrode 3.
Alternatively, the cell C may be configured by being attached. in this case,
A plurality of conductive separators 4 are provided between a pair of strip-shaped protrusions 4b.
And a plurality of cells C are electrically connected.
Cell stacking juxtaposed in a stacked state with a gaseous series connection
In the portion NC, oxygen is contained between adjacent cells C and C.
Let it be a gas flow path s.

In the drawing, reference numeral 81 denotes a wind tunnel for forming a fuel gas supply section Kf, 82 denotes a wind tunnel for forming a gas discharge section H, 83 denotes an inner fuel gas supply pipe, and 84 denotes an inner exhaust pipe. Is shown. Although not shown, each of the inner fuel gas supply pipe 83 and the inner exhaust pipe 84 is connected to the outer fuel gas supply pipe and the outer exhaust pipe at the same communication connection section 50 as in the above embodiment. Although not shown, the oxygen-containing gas supply unit K
s is provided in the heat insulator 31.

[0055]  A plurality of cells C are electrically connected in series.
To form a cell stacking portion NC in a stacked state
The specific configuration for this is not limited to the above embodiment.
And can be changed.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a cell of a fuel cell.

FIG. 2 is an exploded perspective view of a cell stack portion of the fuel cell.

FIG. 3 is a side sectional view of a cell assembly of a fuel cell.

FIG. 4 is a view taken in the direction of the arrows in FIG. 3;

FIG. 5 is a side sectional view of a fuel cell.

FIG. 6 is a view as viewed from the direction of the arrow in FIG. 5;

FIG. 7 is a view as viewed from the direction of the arrow C in FIG. 5;

FIG. 8 is a longitudinal sectional view of a mounting portion of the fuel cell.

FIG. 9 is a longitudinal sectional view of a communication connection part of the fuel cell.

FIG. 10 is a vertical cross-sectional view of an airtight penetration portion of a fuel cell.

FIG. 11 is a side sectional view of a cell assembly of a fuel cell according to another embodiment.

FIG. 12 is a view as seen from the direction of the arrows in FIG. 11;

FIG. 13 is a side sectional view of a cell assembly of a fuel cell according to another embodiment.

FIG. 14 is a view taken in the direction of arrows in FIG. 13;

[Description of Signs ] 7, 8 Interval maintaining member 12 Protective material 12A Through hole 20 Terminal 21 Rod 21A Male thread 22 Nut member 23 Plate 24 Flexible conductive material A Current collector B Fixed part C cell NC cell Laminated part M end face

Claims (2)

(57) [Claims] 1. A plurality of plate cells (C) are juxtaposed in a stacked state in a state of being electrically connected in series,
A cell stack (NC) is formed, and the cell stack (N
A terminal portion (20) for extracting power from the end portion in the stacking direction in C) is provided so as to cover the end surface (M) in the stacking direction of the cell stack portion (NC) and the entire end surface (M). A fuel cell disposed between the protective member and an electrically insulating protective member, wherein the protective member has a peripheral portion on the end surface.
The distance between the end faces by the spacing members (7) and (8)
(M), and the terminal portion (20) is provided between the end surface (M) and the protective material (12) in a state of being in contact with the end surface (M); A current collector (A) having conductivity; and one end connected to the current collector (A) and the other end through a through hole (12A) formed in the protective material (12). 12) a rod-shaped body (21) provided to protrude outwardly and having conductivity, and a fixing part (B) for fixing the rod-shaped body (21) to the protective material (12). is, the current collector part (a), connected to the rod-shaped body (21)且
Plate (23) having electrical conductivity and the plate (2)
3) Flexible conductive material provided between the end face (M)
(24) A fuel cell comprising: 2. The fixing part (B) is provided with the rod-shaped body (2).
Outer peripheral male threaded portion and (21A) provided in the unit, the fuel cell of the externally threaded portion (21A) to the threaded claims 1, characterized in that is constituted from a nut member (22) 1).