JPH10321247A - Fuel cell, disassembling method and re-assembling method for sub-stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical fuel cell with which assembling work can be shortened by making a sub-stack including a single cell having a trouble be changed and re-assembled within a short time. SOLUTION: Four supporting poles 21b are installed in the outside of a fuel cell, a hunging frame 24 is supported by the supporting poles 21b, pulling-up studs 23 are installed in the hunging type frame 24 through jack bolts 26 in an up and down movable manner, and sub-stack holding frames 22 to collectively hold a plurality of layered sub stacks 7 and sub-stack changing holding frames 40 for holding a sub-stack 7x which needs to be changed are installed in the pulling up studs 23 in movable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell having a laminated structure, and more particularly to a fuel cell improved so that a sub-stack can be easily and safely replaced when a problem occurs. Things.

[0002]

2. Description of the Related Art A fuel cell supplies hydrogen, which is obtained by reforming a hydrocarbon fuel such as natural gas or methane gas, and air, which is an oxidizing agent, to the inside of a fuel cell main body. A cell structure (cell stack structure) in which a plurality of unit cells (hereinafter, referred to as unit cells) having the above-described power generation function are stacked by performing an electrochemical reaction through the cell. Has formed.

FIG. 10 is a perspective view including a cell stack structure of a conventionally used fuel cell and a partial cutout of a cooling device, and FIG. 11 is a perspective view showing a configuration of a single cell. That is, as shown in FIG.
On one surface side of the matrix layer 2 holding the electrolyte, a fuel electrode 3a to which hydrogen as a fuel is supplied from the direction of the arrow A in the drawing is disposed, and on the other surface side, air is supplied from the direction of the arrow B in the drawing. An air electrode 3b is provided, and the fuel electrode 3a and the air electrode 3b are provided.
Are formed by laminating electrode bases with ribs 4a and 4b, respectively. Gas-impermeable separators 5 are arranged on both outer surfaces of the pair of ribbed electrode substrates 4a and 4b. That is, one unit cell 1 is constituted by the matrix layer 2, the fuel electrode 3 a, the air electrode 3 b, and the pair of electrode substrates 4 a and 4 b with ribs. Is configured.

Next, the cell stack structure will be described with reference to FIG. First, 5 to 10 single cells 1 having the above-described configuration are stacked via the separator 5 to form one sub-stack 7, and the sub-stack 7 and the water-cooled cooling plate 6 are alternately arranged. The cell stack structure 10 is formed by being stacked. Cooling pipes 12 are embedded in the cooling plate 6, and each of the cooling pipes 12 is connected to a water supply manifold 14 and a drainage manifold 15, each of which is erected by a nipple 16, via an insulating hose 20.

[0005] As shown in FIG. 10, the plurality of cooling plates 6 are assigned No. 1 from the lower side to the upper side of the cell stack structure 10. 1, No. 2 ... No. The serial numbers 40 and No41 are assigned. Further, a fastening plate 8 is provided at the lowermost portion and the uppermost portion of the cell stack structure 10,
By tightening the upper and lower fastening plates 8 with tie rods (not shown), the entire cell stack structure is fastened and fixed with a predetermined load in the stacking direction.

[0006]

However, the fuel cell having the above configuration has the following problems. In other words, if a single cell located in the middle or lower half of the fuel cell stack as described above has a problem such as a sudden drop in performance, and if it becomes necessary to replace the single cell, the problem arises. It has been necessary to sequentially disassemble and remove the cooling plates inserted for each of the stacked single cells and each sub-stack from the uppermost stage up to the position of the single cell in which the occurrence of occurred. Along with this, it is necessary to cut and disassemble the insulating hose connected to each cooling plate.
After replacing the defective part, reassembly work was also required. Therefore, it takes a long time to replace the unit cell in which the inconvenience has occurred, and there is also a fear that the sound part may be damaged during the disassembly / reassembly operation.

In order to solve such a problem, various proposals have been made in Japanese Patent Application Laid-Open No. 58-166676 and Japanese Patent Publication No. 6-97616, but none of them has specificity. It was not a radical solution.

The present invention has been proposed to solve the problems of the prior art as described above, and its object is to replace and reassemble a sub-stack containing a single cell in which inconvenience has occurred. It is an object of the present invention to provide a fuel cell which is economical and contributes to shortening the construction period.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a pair of electrodes carrying a catalyst are arranged on one surface of an electrode plate with the catalyst surfaces facing each other. A single cell is formed by sandwiching an electrolyte layer impregnated with an electrolyte between the catalyst surfaces of the pair of electrodes, and a plurality of the single cells are stacked to form a sub-stack, and each of the sub-stacks is interposed with a cooling plate. And a support member disposed outside the fuel cell, a suspension member supported by the support member, and a pull-up movably attached to the suspension member. Studs,
A lifting member for moving the lifting stud up and down, a first holding member for holding a plurality of the stacked sub-stacks together, and a second holding member for holding a desired sub-stack. And wherein the first holding member and the second holding member are movably attached to the lifting stud.

According to the fuel cell of the first aspect having the above-described structure, a problem occurs in a single cell located in the lower half of the fuel cell stack, and the sub-stack including the single cell is replaced. When the need arises, by using the first holding member, the stacked sub-stacks are collectively held by a plurality of pieces from the uppermost stage, and the lifting stud is pulled upward by using the lifting member. The plurality of held sub-stacks and the cooling plate inserted therebetween can be lifted together without disassembling.

Further, the sub-stack requiring replacement and the cooling plate located below the sub-stack are held by using the second holding member, and the sub-stack is lifted up by using the pull-up member. Create a gap, use this gap to pull out the sub-stack that needs to be replaced and the cooling plate,
It can be exchanged for a new substack.

[0012] Thus, the sub-stack in which the inconvenience has occurred can be replaced in a short time without disassembling other sound sub-stacks or cutting / disassembling the insulating hoses of other cooling plates. . Further, since only the sub-stack that needs to be replaced and the cooling plate below the sub-stack are taken out, other healthy sub-stacks are not damaged.

According to a second aspect of the present invention, in the fuel cell according to the first aspect, the suspension member is formed in a rectangular frame.

According to the fuel cell of the second aspect having the above configuration, the work of attaching the suspension member to the support member becomes easy.

According to a third aspect of the present invention, in the fuel cell according to the first aspect, a detachable stopper is provided below the first holding member.

According to the fuel cell according to the third aspect of the present invention, since the stopper is further provided below the first holding member, the plurality of sub-stacks can be more reliably held. It will be.

According to a fourth aspect of the present invention, in the fuel cell according to the first aspect, the lifting member is a jack bolt.

The invention described in claim 5 is the first invention.
In the fuel cell described above, the lifting member is a hydraulic jack.

According to the fuel cell of the fourth and fifth aspects having the above-described structure, the lifting stud attached to the suspension member can be easily moved up and down. The first
The stacked sub-stacks and cooling plates can be easily moved up and down via the second holding member.

According to a sixth aspect of the present invention, a pair of electrodes carrying a catalyst are arranged on one surface of an electrode plate with their catalyst surfaces facing each other, and an electrolyte is impregnated between the catalyst surfaces of the pair of electrodes. A single cell is formed with the electrolyte layer interposed therebetween, a plurality of the single cells are stacked to form a sub-stack, and a plurality of the sub-stacks are stacked with a cooling plate interposed therebetween to form a sub-stack of a fuel cell. In the disassembly method, the stacked sub-stacks are collectively lifted up from the top one by one until the sub-stack located above the sub-stack requiring replacement, and then the sub-stack requiring replacement is pulled out of the fuel cell stack. It is characterized by the following.

According to the method for disassembling a sub-stack according to the sixth aspect of the present invention, there is a disadvantage in a unit cell having a fuel cell stack, and it is necessary to replace the sub-stack including the unit cell. If this occurs, the stacked sub-stacks are lifted one by one from the top one by one,
By pulling out the sub-stack that needs to be replaced from the fuel cell stack, inconvenience occurs in a short time without disassembling other sound sub-stacks and cutting / disassembling other cooling plate insulation hoses. Only the sub-stack can be decomposed. Further, since only the sub-stack that needs to be replaced and the cooling plate below the sub-stack are taken out, other healthy sub-stacks are not damaged.

According to a seventh aspect of the present invention, a pair of electrodes carrying a catalyst are arranged on one surface of an electrode plate with their catalyst surfaces facing each other, and an electrolyte is impregnated between the catalyst surfaces of the pair of electrodes. A single cell is formed with the electrolyte layer interposed therebetween, a plurality of the single cells are stacked to form a sub-stack, and a plurality of the sub-stacks are stacked with a cooling plate interposed therebetween to form a sub-stack of a fuel cell. In the disassembly method, a support member is provided outside the fuel cell, a suspension member is supported by the support member, and a lifting stud is attached to the suspension member so as to be vertically movable, and at a predetermined position of the lifting stud. Attaching the first holding member and the second holding member, holding the plurality of stacked sub-stacks together by the first holding member, and moving the lifting stud upward. By the second holding member, and is characterized in that retain the desired sub-stack, pulled out the sub-stacks from the fuel cell stack.

According to the method of disassembling the sub-stack according to the seventh aspect of the present invention, there is a disadvantage in a unit cell located in the lower half of the fuel cell stack, and the unit including the unit cell is inconvenient. When it is necessary to replace the stack, the stacked sub-stacks are collectively held by a plurality of pieces from the top using the first holding member, and the lifting stud is pulled up using the lifting member. Thus, the held plurality of sub-stacks and the cooling plate inserted therebetween can be lifted together without disassembling.

Further, the sub-stack requiring replacement and the cooling plate located below the sub-stack are held by using the second holding member, and the sub-stack is lifted up by using the lifting member. A gap is formed, and by utilizing this gap, the sub-stack requiring replacement and the cooling plate can be easily pulled out.

Thus, it is possible to disassemble only the sub-stack in which the inconvenience occurs in a short time without disassembling other sound sub-stacks or cutting / disassembling the insulating hoses of other cooling plates. it can. Also, since only the sub-stack that needs to be replaced and the cooling plate below it are taken out,
It does not damage other healthy substacks.

According to the present invention, a pair of electrodes carrying a catalyst are arranged on one surface of an electrode plate with their catalyst surfaces facing each other, and an electrolyte is impregnated between the catalyst surfaces of the pair of electrodes. A single cell is formed with the electrolyte layer interposed therebetween, a plurality of the single cells are stacked to form a sub-stack, and a plurality of the sub-stacks are stacked with a cooling plate interposed therebetween to form a sub-stack of a fuel cell. In the disassembly / reassembly method, the stacked sub-stacks are sequentially lifted up from the upper portion to the sub-stack located above the sub-stack requiring replacement, and then the sub-stacks requiring replacement are sequentially stacked. Pull out from the body, replace it with a new sub stack, return it to the fuel cell stack again, and return the sub stacks that have been lifted together by multiple pieces to the position of the forward dimension Is shall.

According to the method of disassembling and reassembling the sub-stack according to the eighth aspect of the present invention, there is a problem in a unit cell having a fuel cell stack, and the sub-stack including the unit cell is replaced. If it becomes necessary to disassemble other sound sub-stacks, lift the stacked sub-stacks in order from the top, and then pull out the sub-stacks that need to be replaced from the fuel cell stack. Without cutting the insulation hoses of other cooling plates.
The sub-stack in which the problem has occurred can be replaced in a short time without disassembly. Further, since only the sub-stack that needs to be replaced and the cooling plate below the sub-stack are taken out, other healthy sub-stacks are not damaged.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. Note that FIGS. 10 and 11
The same members as those of the conventional type shown in FIG.
Description is omitted.

[1. Configuration of Embodiment] The fuel cell of the present embodiment is configured as shown in FIGS.
That is, as shown in FIG. 1, a large number of sub-stacks 7 each formed by stacking 5 to 10 single cells 1 are alternately stacked with the cooling plates 6, and are arranged on the upper surface of the base portion 21 a of the stacking base 21. It is arranged on the lower fastening plate 8 which is provided. As shown in FIG. 2, four pillars 21 b (corresponding to the supporting members in the claims) are provided on the stacking frame 21 outside the four corners of the fuel cell stack. The upper plate 21c is attached to the upper end. A rectangular hanging frame 24 (corresponding to a hanging member in the claims) is attached to the upper plate 21c so as to be vertically movable by jack bolts 26 (corresponding to a lifting member in the claims). . In addition, the support pin 2 is provided on the upper plate 21c.
5 is provided so as to protrude upward, and the hanging frame 2 is provided.
In order to suppress the horizontal movement of the suspension frame 4, it is disposed through a hole 24 a formed in the suspension frame 24. Note that FIG.
FIG. 5 is an enlarged view showing a configuration of a mounting portion of a suspension frame 24 to the upper plate 21c.

Further, as shown in FIGS. 1 and 2, each side of the suspension frame 24 is provided with two lifting studs 23 so as to be located near the four side surfaces of the fuel cell stack. (Corresponding to the lifting stud of the claim) is attached. And this lifting stud 23
, A plurality of sub-stack holding frames 22 (corresponding to the first holding member in the claims) and a plurality of sub-stack replacement holding frames 40 (corresponding to the second holding members in the claim) are vertically movably penetrated. Are located.

The sub-stack holding frame 22 has 5
It is used to hold the sub-stack 7 and the cooling plate 6 of up to six layers. After being moved to a desired position along the pulling stud 23, it is fixed to the pulling stud 23 by tightening a nut 28. It is configured. On the other hand, the sub-stack replacement holding frame 40 is used for replacing the inconvenient sub-stack 7X, and the cooling plate 6X located below the sub-stack 7X.
After being attached to the side of the stud 23, the nut 41 is fixed to the lifting stud 23 by tightening the nut 41.

As a result of this construction, when the suspension frame 24 is lifted upward by the jack bolt 26, the lifting stud 23 fixed to the suspension frame 24 is also lifted upward, and at the same time, is lifted. The sub-stack holding frame 22 and the sub-stack replacement holding frame 40 fixed to the stud 23 are also configured to be pulled up.

FIGS. 4 and 5 show the detailed structure of the sub-stack holding frame 22. FIG. That is, as shown in FIGS. 2 and 5, the sub-stack holding frame 22 has an assembling structure divided into four sides, and the corners are joined together by bolts and nuts 29 to be integrated into a frame shape. Thus, the desired sub-stack 7 and the cooling plates 6 above and below it can be firmly held. As described above, when the sub-stack holding frame 22 is moved to a desired position along the lifting stud 23, the bolt / nut 29 is loosened so that a desired sub-stack position can be appropriately selected. ing.

Further, as shown in FIG. 4, the side surfaces of the cooling plate 6 located above and below the sub-stack 7 to which the sub-stack holding frame 22 is attached are connected to the sub-stack holding frame 22.
Between them, a non-slip 30 is attached. In addition,
The width Y of the non-slip 30 is 50 to 80% of the thickness Z of the cooling plate 6 as shown in FIG. 4, and the thickness of the non-slip 30 at the center as shown in FIG. v is 1.5 to 3 times the thickness w of both sides. as a result,
Since the non-slip 30 protrudes from the cooling plate 6 to damage the cells and prevent the central stacking force from decreasing due to the deflection of the sub-stack holding frame 22, the number of sub-stacks to be held can be appropriately selected. Further, the sub stack can be reliably held from the side surface of the cooling plate.

As shown in FIGS. 4 and 5, a stopper receiving plate 33 is mounted on the lower surface of the sub-stack holding frame 22, and the stopper 34 is inserted into the stopper receiving plate 33 to thereby stop the stopper. 34 is configured to be inserted into the lower surface of the cooling plate 6. As a result, it is possible to more firmly support the peripheral bottom surface of the cooling plate 6. The stopper 34 has an L-shaped cross section as shown in FIG.

Further, as shown in FIG. 1, a pedestal 50 on which the extracted sub-stack is to be placed is provided in the vicinity of the side surface of the stacked body. The pedestal 50 is provided with a trolley, and is configured so that its height can be adjusted according to the position of the sub-stack that needs to be replaced. The receiving table 50 is arranged on the side of the laminate different from the entrance and exit of the cooling pipe so as not to damage the supply / drain manifolds 14 and 15.

[2. Operation of Embodiment] In the fuel cell according to the present embodiment having the above-described configuration, in the case where a certain unit cell is inconvenienced and the sub-stack including the single cell needs to be replaced, the following will be described. Then, the sub stack is exchanged.

That is, as shown in FIG. 1, when replacing the sub-stack 7X located in the lower half of the fuel cell stack, first, the sub-stack holding frame 22 penetrating through the lifting stud 23 is 5-6 from top of laminate
It is set at the position of the sub-stack 7A of the layer, and is fixed to the lifting stud 23 by tightening the nut 28 as shown in FIG. Similarly, another sub-stack holding frame 22 is formed by sub-stacks 7B,
7C, and finally at the position of the sub-stack 7M immediately above the sub-stack 7X where the problem has occurred.

Then, the suspension frame 24 is jacked up by the jack bolt 26, and as shown in FIG. 8, the cooling plate 6M just before the sub-stack 7X that needs to be replaced.
To the sub-stack 7X that needs to be replaced.

Subsequently, as shown in FIG. 4, the sub-stack replacement holding frame 40 is attached to the side of the cooling plate 6X located below the sub-stack 7X requiring replacement, and the nut 41 is tightened. Raised stud 23 by
Fixed to Then, the suspension frame 24 is jacked up by the jack bolt 26, a gap is provided below the cooling plate 6X, and the slide strip 36 is inserted into the gap.

Next, the nut 41 is loosened, and the sub-stack 7X requiring replacement and the cooling plate 6X located below the sub-stack 7X are placed on the slide strip 36, and the slide strip 36 is slid outward, and the sub-stack 7X and the cooling plate 6X are pulled out together, placed on the receiving table 50, and the sub-stack 7X requiring replacement is replaced with a sound sub-stack. Then, the sub-stack and the cooling plate 6X are inserted again into the fuel cell stack together with the cooling plate 6X pulled out together, and the exchanged sub-stack and the cooling plate 6X are jacked up using the holding frame 40 for sub-stack replacement to form a slide band. Only the plate 36 is pulled out, and the replaced sub-stack and the cooling plate 6X are returned to their original positions. next,
The upper sub stack that had been jacked up is sequentially jacked down and reassembled.

In this case, it is only necessary to cut off the insulating hose of the cooling plate 6X located below the sub-stack 7X that needs to be replaced, and the other cooling plates 6 are connected to the supply / drain manifold via the insulating hose 20. It is held by the sub-stack holding frame 22 in a state of being connected to 14 and 15. (See FIG. 8). The slide strip 36 is made of, for example, a fluororesin such as PTFE (ethylene tetrafluoride) so as not to be corroded by reacting with phosphoric acid attached to the cells.

[3. Effect of the Embodiment] As described above, according to the fuel cell of the present embodiment, even if a problem occurs in a single cell and the sub-stack including the single cell needs to be replaced, another healthy sub-stack can be used. Can be replaced in a short time without disassembly and without cutting and disassembling the insulating hose of the cooling plate. Further, since only the sub-stack that needs to be replaced and the cooling plate below the sub-stack are taken out, other healthy sub-stacks are not damaged.

[4. Other Embodiments] The present invention is not limited to the above-described embodiment, and a hydraulic jack 27 may be used as a means for jacking up the suspension frame 24 as shown in FIG. It is possible.

As shown in FIG. 2, the stopper 34 inserted in the lower portion of the sub-stack holding frame 22 is provided only on the opposite side of the cooling pipe buried in the cooling plate, which is located in the longitudinal direction. Thereby, only the side of the cooling pipe having high rigidity can be supported, and the side having low bending rigidity due to the presence of the pipe groove can not be supported.

Further, a holding frame 40 for sub-stack replacement is provided.
Need not necessarily be arranged to penetrate through the lifting stud 23, and may be configured to be fixed to the immediately preceding sub-stack holding frame 22.

[0047]

As described above, according to the present invention, a sub-stack including a single cell in which an inconvenience has occurred can be replaced in a short time and reassembly can be performed. The fuel cell that performs the above can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an embodiment of a fuel cell according to the present invention.

FIG. 2 is a plan view of the embodiment shown in FIG. 1;

FIG. 3 is an enlarged view of a jack bolt portion of the embodiment shown in FIG.

FIG. 4 is a sectional view showing a configuration of a sub-stack holding frame.

FIG. 5 is a plan view showing a configuration of a corner portion of the sub-stack holding frame.

FIG. 6 is a plan view of a sub-stack holding frame (one side).

FIG. 7 is a perspective view of a stopper.

FIG. 8 is a view for explaining the operation of the present invention, and is a schematic view showing a state where the sub-stack is lifted.

FIG. 9 is an enlarged view showing another configuration of the lifting member of the hanging frame of the present invention.

FIG. 10 is a perspective view including a cell stack structure of a conventional fuel cell and a partial cutout of a cooling device.

FIG. 11 is a perspective view showing a configuration of a single cell.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Single cell 6 ... Cooling plate 7 ... Sub-stack 7X ... Sub-stack which needs exchange 8 ... Tightening plate 10 ... Cell stack structure 12 ... Cooling pipe 14 ... Water supply manifold 15 ... Drainage manifold 20 ... Insulation hose 21 ... Laminated pedestal 22 ... Sub-stack holding frame 23 ... Lifting stud 24 ... Hanging frame 26 ... Jack bolt 27 ... Hydraulic jack 30 ... Non-slip 34 ... Stopper 36 ... Slide band plate 40 ... Sub-stack replacement holding frame 50 ... Cradle

Claims (8)

[Claims] 1. A pair of electrodes carrying a catalyst on one surface of an electrode plate are disposed with their catalyst surfaces facing each other, and a single electrode is sandwiched between the catalyst surfaces of the pair of electrodes with an electrolyte layer impregnated with an electrolyte interposed therebetween. A fuel cell is formed by forming a cell, stacking a plurality of the single cells to form a sub-stack, and stacking the sub-stack with a plurality of cooling plates interposed therebetween, wherein the sub-stack is disposed outside the fuel cell. A supporting member, a suspending member supported by the supporting member, a lifting stud movably attached to the hanging member, a lifting member for moving the lifting stud up and down, and the stacked sub A first holding member for holding a plurality of stacks together; and a second holding member for holding a desired sub-stack, wherein the lifting stud includes a first holding portion. When the fuel cell, characterized in that mounted movably second holding member. 2. The fuel cell according to claim 1, wherein the suspension member is formed in a rectangular frame. 3. The fuel cell according to claim 1, wherein a detachable stopper is provided below the first holding member. 4. The fuel cell according to claim 1, wherein the lifting member is a jack bolt. 5. The fuel cell according to claim 1, wherein the lifting member is a hydraulic jack. 6. A pair of electrodes carrying a catalyst on one surface of an electrode plate are arranged with their catalyst surfaces facing each other, and a single electrode is sandwiched between the catalyst surfaces of the pair of electrodes with an electrolyte layer impregnated with an electrolyte therebetween. Forming a cell, forming a sub-stack by laminating a plurality of the single cells, forming a sub-stack, and laminating the sub-stack with a plurality of cooling plates interposed therebetween. A plurality of sub-stacks, each of which is sequentially lifted from the top to a sub-stack located above the sub-stack requiring replacement, and then the sub-stack requiring replacement is withdrawn from the fuel cell stack. Decomposition method. 7. A pair of electrodes carrying a catalyst on one surface of an electrode plate are disposed with their catalyst surfaces facing each other, and a single electrode is sandwiched between the catalyst surfaces of the pair of electrodes with an electrolyte layer impregnated with an electrolyte therebetween. A method of disassembling a sub-stack in a fuel cell comprising forming a cell, stacking a plurality of the single cells to form a sub-stack, and stacking the sub-stack with a plurality of cooling plates interposed therebetween, wherein the fuel cell A supporting member is provided outside the supporting member, a suspending member is supported by the supporting member, and a lifting stud is attached to the suspending member so as to be vertically movable, and a first holding member is provided at a predetermined position of the lifting stud. A second holding member is attached, a plurality of stacked sub-stacks are collectively held by the first holding member, and the lifting stud is moved upward. Therefore, a method for disassembling a sub-stack, comprising holding a desired sub-stack and pulling out the sub-stack from the fuel cell stack. 8. A pair of electrodes carrying a catalyst on one surface of an electrode plate are arranged with their catalyst surfaces facing each other, and a single electrode is sandwiched between the catalyst surfaces of the pair of electrodes with an electrolyte layer impregnated with an electrolyte therebetween. Forming a cell, forming a sub-stack by stacking a plurality of the single cells, and disassembling and reassembling the sub-stack in a fuel cell formed by stacking a plurality of the sub-stacks with a cooling plate interposed therebetween; After the stacked sub-stacks are sequentially lifted from the upper portion to the sub-stack located above the sub-stack requiring replacement, a plurality of the sub-stacks are sequentially lifted, and then the sub-stack requiring replacement is pulled out of the fuel cell stack, and a new sub-stack is removed. After replacing the stack, return to the fuel cell stack again, and return the sub-stacks, which have been lifted together by a plurality, to the forward dimension position. Reassembly method.