JP6681537B2 - Joined body, fuel cell using the joined body, and method for disassembling the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a joined body, a fuel cell using the joined body, and a decomposition method thereof.

  A solid polymer electrolyte fuel cell (PEFC) is a device that simultaneously generates electric power and heat by electrochemically reacting a fuel gas containing hydrogen with an oxidant gas containing oxygen such as air. .

  The basic components of this PEFC are shown in the sectional view of FIG. First, there are an electrolyte membrane 15 that selectively transports hydrogen ions, and an anode electrode 22 and a cathode electrode 23 formed on the surface of the electrolyte membrane 15. These electrodes are an anode catalyst layer 16 formed on the surface of the electrolyte membrane 15, a cathode catalyst layer 17, and a gas diffusion layer 18 (GDL) arranged outside the catalyst layer and having both gas permeability and electronic conductivity. Have.

  Such an assembly in which the electrolyte membrane 15, the anode electrode 22, and the cathode electrode 23 are integrally joined and assembled is referred to as an electrolyte membrane-electrode assembly (MEA: Membrane Electrode Assembly). Hereinafter, it is referred to as MEA 10.

  Further, the frame body 9 is fitted to the outer edge of the MEA 10 to form the joined body 14, and a sectional view of the outer edge portion is shown in FIG. 7. A frame body 9 is fitted to the outer edge of the MEA 10. On both sides of the MEA 10, electrically conductive separators 11 for mechanically sandwiching and fixing the MEA 10 and electrically connecting adjacent MEAs 10 in series are arranged. Gas passage grooves 13 for supplying a reaction gas to each electrode and carrying away generated water and surplus gas are formed in a portion of the separator 11 that is in contact with the MEA 10. The structure in which the MEA 10 is sandwiched between the pair of separators 11 as described above is referred to as a unit cell module, simply the cell 2.

  Further, in order to supply the reaction gas to the gas flow channel 13, a manifold hole is provided at the edge of the separator 11 to distribute the reaction gas. Further, between the pair of separators 11 so as to surround the electrode forming portion of the MEA 10, that is, the outer periphery of the power generation region, so that the reaction gas or the like supplied to the gas flow channel 13 does not leak or mix to the outside. A sealing member 20 (gasket) is arranged in the.

  Here, a precious metal such as platinum is used for the electrodes of the MEA 10. When the MEA 10 is discarded, the MEA 10 should be taken out from the frame 9 portion and the noble metal contained in the electrode should be recovered and reused.

  FIG. 8A and FIG. 8B are cross-sectional views showing a conventional method for disassembling the electrolyte bonded body 14. As shown in FIG. 8A, a broken line-shaped separating portion 24 for dividing the frame body 9 into two or more parts is formed, and the frame body 9 is separated from the starting point (FIG. 8B). There is a method of taking out the MEA 10 in (for example, Patent Document 1).

  FIG. 9: is a figure which shows the structure of the conventional electrolyte joined body described in patent document 1. As shown in FIG. In FIG. 9, the frame 105 is joined to the outer edge of the MEA 101. The frame body 105 is provided with a bolt hole 102 for stacking and fastening single cells, a manifold hole 103 for supplying gas, and a gasket 104 for sealing gas, and the inner peripheral portion is provided with A cut line 106 is formed. With such a configuration, when disassembling the electrolyte assembly, the inner peripheral portion of the frame body 105 is separated by using the cutoff line 106, and the MEA 101 is taken out.

International Publication No. 2009-144940

  However, in the conventional configuration, since the separation portion 24 (FIG. 8) of the frame body 9 is in contact with the electrolyte membrane of the MEA 10, there is a risk that the MEA 10 may be damaged due to a membrane breakage or the like when the frame body 9 is separated. There is. Therefore, the conventional configuration has a problem that it is difficult to disassemble the MEA 10 without damaging it.

MEANS TO SOLVE THE PROBLEM This invention solves the said conventional subject, Comprising: It can collect | recover MEA without damaging it and can reuse it, the fuel cell using the same, and its disassembly method. The purpose is to provide.

  In order to achieve the above object, a joined body including an electrolyte membrane and a frame body that holds the electrolyte membrane, wherein the frame body has a first frame body that holds one surface of the electrolyte membrane and the other surface. A second frame body to be held is provided, and a joint part for connecting the first frame body and the second frame body is further provided, and the joint part is a joint body having a protrusion.

  Further, a fuel cell is used which is assembled by stacking a plurality of unit cell modules each including the above-mentioned joined body and a pair of separators sandwiching the joined body.

  Further, the peripheral portion of the electrolyte membrane is sandwiched between the second frame body and the first frame body having an outer diameter smaller than that of the second frame body, and the second frame body and the first frame body are combined with each other. A method for disassembling a joined body in which a portion is covered with a joined portion and a protrusion is provided on the joined portion, wherein a peripheral edge portion of the second frame body on the protrusion direction side is deformed to warp, A method for disassembling a joined body is used, which includes a first step of peeling the protrusion from the second frame body and a second step of peeling the joint portion and the first frame body from the second frame body by the protrusion.

  As described above, according to the electrolyte assembly of the present invention, MEA containing a noble metal can be recovered and reused from a used solid polymer electrolyte fuel cell, a defective process product, or the like without damage. .

Exploded perspective view of the fuel cell stack of the embodiment (A) A plan view of a joined body of an electrolyte membrane, an electrode and a frame in a fuel cell of an embodiment, (b) A partial sectional view of a joined body of an electrolyte membrane, an electrode and a frame of the embodiment, (c) to. (D) A plan view of a joined body of the electrolyte membrane, the electrode and the frame according to the embodiment. (A) A plan view of a frame corner portion according to Embodiment 1 of the present invention, and (b) to (c) a cross-sectional view of the frame corner portion according to Embodiment 1 of the present invention. (A)-(b) Schematic of the disassembly method of the joined body of the electrolyte membrane, the electrode, and the frame in Embodiment 1 of the present invention. (A)-(b) The top view of the frame shape in Embodiment 1 of this invention. Cross-sectional view of components of a conventional solid polymer electrolyte fuel cell Cross-sectional view of a single cell of a conventional fuel cell (A)-(b) The figure which shows the disassembly method of the conventional electrolyte joined body. Plan view of a conventional assembly of an electrolyte membrane, an electrode and a frame in Patent Document 1

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
The fuel cell is, for example, a solid polyelectrolyte fuel cell (PEFC), in which a fuel gas containing hydrogen and an oxidant gas containing oxygen such as air are electrochemically reacted to generate electric power and heat. , And water at the same time.

  FIG. 1 is a perspective view schematically showing a structure of a fuel cell stack 1 which is an example of a polymer electrolyte fuel cell (PEFC) according to an embodiment by disassembling a part thereof. As shown in FIG. 1, the fuel cell stack 1 is configured by stacking a plurality of cells 2 which are single cell modules in series. A current collector plate 3, an end plate 4, and a spring 5 are attached to the outermost layers of both ends of the cell 2, and the cell 2 is fastened from both ends with fastening bolts 7 and nuts 8 which are inserted through bolt holes 6. It is configured.

<Current collector 3>
The collector plate 3 is a plate arranged outside the stacked body of the cells 2. As the current collector plate 3, a copper plate plated with gold is used so that the generated electricity can be efficiently collected. The current collector plate 3 may be made of a metal material having good electric conductivity, such as iron, stainless steel, or aluminum. The surface treatment of the current collector plate 3 may be tin plating, nickel plating, or the like.

  On the outer side of the current collector plate 3, an end plate 4 having high electrical insulation is arranged to insulate electricity. Here, the end plate 4 is manufactured by injection molding using polyphenylene sulfide resin. The end plate material may be not only a thermoplastic resin but also a thermosetting material. The pipe integrated with the end plate 4 is configured to be pressed against the manifold of the laminated body of the cells 2 via a gasket, but the end plate and the pipe can be separated. Inside the end plate 4, springs 5 for applying a load to the cell 2 are concentratedly arranged on the projected portion of the MEA 10, that is, inside the cell 2, and are adjusted and fastened by a fastening bolt 7 and a nut 8 during assembly. There is.

<Cell 2>
The cell 2 is composed of an MEA 10 having a frame 9 on the peripheral edge thereof, sandwiched between a pair of conductive anode-side separators 11A and cathode-side separators 11C, and further constituted by an outer cooling water separator 11W.

  Each of the anode-side separator 11A and the cathode-side separator 11C has a flat plate shape, and the surface on the side in contact with the MEA 10, that is, the inner surface is adapted to the shape of the MEA 10. Various manifold holes 12 and bolt holes 6 penetrate through the anode-side separator 11A and the cathode-side separator 11C in the thickness direction. Further, a fuel gas flow channel 13A and an oxidant gas flow channel 13C are formed on the inner surfaces of the anode-side separator 11A and the cathode-side separator 11C, and cooling is performed on the back surfaces of the anode-side separator 11A and the cathode-side separator 11C. The water channel groove 13W is formed. The anode-side separator 11A and the cathode-side separator 11C may be any gas-impermeable conductive material, for example, a resin-impregnated carbon material cut into a predetermined shape, or a mixture of carbon powder and a resin material, A molded metal is used.

<Frame 9>
A pair of through holes, that is, a manifold hole 12, through which the fuel gas, the oxidant gas, and the cooling water flow are formed in the frame body 9 arranged in the peripheral portion of the MEA 10. When the cells 2 are stacked, these through holes are stacked and combined to form the manifold hole 12 of the fuel gas / oxidant gas / cooling water. The frame 9 is made by injection-molding a polyphenylene ether resin having excellent chemical resistance, heat resistance, and insulation properties, but a thermoplastic resin such as polyphenylene sulfide, polypropylene, or polyethylene, or a thermosetting resin such as epoxy is used. It can also be used.

  Although not shown, a gasket is present. The gasket is an elastic body and is integrally formed with the anode side separator 11A and the cathode side separator 11C. When pressed, the MEA 10 is deformed according to the shape of the frame 9 of the main body, and the outer circumference of the MEA 10 main body and the outer circumference of the manifold hole 12 are sealed. This prevents the fuel gas, the oxidant gas, and the cooling water from leaking between the adjacent cells 2 and the connecting portions between the cells 2 of the various manifold holes 12.

  2A is a plan view of the bonded body 14, and FIG. 2B is a partial cross-sectional view of FIG. 2A. The frame 9 (first frame 9 </ b> A, second frame 9 </ b> B) is provided on the peripheral portion of the joined body 14.

  The central portion of the bonded body 14 covers the electrolyte membrane 15 with the gas diffusion layer 18. At the end of the bonded body 14, the electrolyte membrane 15 is sandwiched between the second frame 9B and the first frame 9A. Bolt holes 6 and manifold holes 12 are arranged in the second frame body 9B.

  The second frame 9B and the first frame 9A are provided so that the laminated body (FIG. 6) of the electrolyte membrane 15, the gas diffusion layer 18, the anode electrode 22 and the cathode electrode 23 is not exposed.

  The partial sectional view of FIG. 2B shows a sectional view of the MEA 10 (a sectional view of a dotted line portion of FIG. 2A). The MEA 10 forms an anode catalyst layer 16 containing carbon powder carrying a platinum ruthenium alloy catalyst as a main component on the anode surface side of an electrolyte membrane 15 that selectively transports hydrogen ions, and the platinum catalyst on the cathode surface side. A cathode catalyst layer 17 whose main component is supported carbon powder is formed. On the surfaces of these catalyst layers, a gas diffusion layer 18 (GDL) having both gas permeability of a fuel gas or an oxidant gas and electronic conductivity is arranged.

  As the electrolyte membrane 15, a solid polymer material having proton conductivity, for example, a perfluorosulfonic acid membrane (Dafon Nafion membrane) is used.

<Details of bonded body 14>
Details of the bonded body 14 in the present embodiment are shown by a plan view of the bonded body 14 of FIG. 2A and cross-sectional views of FIG. 2C and FIG. 2D.

  2C and 2D are cross-sectional views of the end portion (peripheral portion) and DD portion (FIG. 2A) of the joined body 14. FIG. 2C is before assembly of the joined body 14, and FIG. 2D is after assembly of the joined body 14.

  The area A is an outer peripheral area of the electrolyte membrane 15 having the anode catalyst layer 16 and the cathode catalyst layer 17 (FIG. 2A) formed on both surfaces.

  Area B is the outer peripheral size of the gas diffusion layer 18 (FIG. 2A).

  The area C is the inner peripheral size of the frame body 9 (first frame body 9A, second frame body 9B).

  The F region is the power generation electrode area. This is the part that generates electricity.

  The outer peripheral size of the gas diffusion layer 18 in the B region is preferably equal to the inner peripheral size of the frame 9 (first frame 9A, second frame 9B) in the C region, but may be larger.

  As shown in FIGS. 2C and 2D, in the bonded body 14, the peripheral portion of the electrolyte membrane 15 having the anode catalyst layer 16 and the cathode catalyst layer 17 (FIG. 2) on both sides is formed of resin. It is sandwiched between two frame-shaped first frame bodies 9A and second frame bodies 9B. In that state, as shown in FIG. 2C, the joint portion 19 (by resin molding or the like is formed over the entire circumference so as to cover the boundary G between the inner first frame 9A and the outer second frame 9B. The joint part of the frame body) is formed. This joins the first frame body 9A and the second frame body 9B. The joining portion 19 is preferably injection-molded with the same thermoplastic resin (for example, polyphenylene ether resin) as the first frame 9A and the second frame 9B, but a thermosetting adhesive or the like can also be used. .

  As can be seen from FIGS. 2C and 2D, the second frame 9B and the outer first frame 9A have different shapes. The second frame 9B is mainly used, the end of the electrolyte membrane 15 is placed in the recess, and the first frame 9A is placed from above. Then, as described above, the first frame body 9A and the second frame body 9B are fixed at the joint portion 19. In this case, the first frame body 9A and the second frame body 9B are quadrangular, have an opening in the center, and have a frame shape. It may be polygonal instead of quadrangular. Also, the corners of the polygon may be R-shaped.

  In this way, the electrolyte membrane 15 is sandwiched between the first frame 9A and the second frame 9B, and the gas diffusion layer 18 is joined. This allows the bonded body 14 to be formed without directly applying a molding pressure to the electrolyte membrane 15 and the gas diffusion layer 18. Therefore, the durability of the MEA 10 can be kept longer.

  In addition, as shown in FIG. 2C, in the joined body 14, the gas diffusion layer 18 is provided on the portion E having a large thickness on the inner circumference of the first frame body 9A and the second frame body 9B sandwiching the electrolyte membrane 15. Configured to ride up.

  As shown in FIG. 2D, when the joined body 14 is sandwiched by the separators 11, the gas diffusion layer 18 riding on the first frame 9A and the second frame 9B fills the space with the separator 11. I am configuring.

  In this way, by riding a part of the outer periphery of the gas diffusion layer 18 inside the first frame 9A and the second frame 9B, it is possible to prevent the electrolyte membrane 15 from being exposed and directly contacting with gas to be deteriorated, and to improve durability. Can be improved.

  Further, the gas diffusion layer 18 is mounted on the first frame 9A and the second frame 9B to prevent the gas from flowing out of the region F of the power generation electrode.

<Corner of the joint 19>
Here, the corner portion of the joint portion 19 in the present embodiment will be described with reference to the plan view of FIG. 3A and the sectional view of FIG. FIG. 3A is a plan view showing the shape of the corner portion of the joint portion 19 of the frame body 9. FIG. 3B is an HH cross-sectional view showing the configuration of the corner portion of the joint portion 19 between the first frame body 9A and the second frame body 9B in FIG. 3A.

  When forming the joined body 14, the joining portion 19 of the frame body may join the boundary portion G (FIG. 2C) between the first frame body 9A and the second frame body 9B.

  The joint portion 19 is formed over both the upper surface of the first frame 9A and the upper surface of the second frame 9B. It is preferable that the upper surface of the first frame body 9A and the upper surface of the second frame body 9B form the same plane.

  The joint portion 19 and the first frame 9A are sheet-shaped. The second frame body 9B has a thin portion, and has the first frame body 9A in that portion.

  However, as shown in FIGS. 3 (a) and 3 (b), by forming the protrusion 21 protruding in the outer peripheral direction, when the bonded body 14 is disassembled, the protrusion 21 is easily disassembled from the starting point. It becomes possible to do. As shown in FIG. 3 (b), the protrusions 21 project horizontally rather than on the upper and lower surfaces of the joined body 14. The horizontal direction is parallel to the upper surface of the first frame body 9A and the upper surface of the second frame body 9B.

  As a result, as will be described with reference to FIGS. 4 (a) and 4 (b) below, the protrusion 21 is likely to be peeled off from the second frame 9B during the disassembling method of the bonded body 14. The protrusions 21 do not largely protrude vertically except when disassembled, so that no problem occurs with other objects.

  Further, the protrusion 21 may be formed on the extension line of one of the two sides. It does not have to be the extension direction. In that case, it is easier to disassemble if the gap between the outer peripheral portion of the second frame 9B and the boundary portion G projects in a relatively wide direction. Therefore, the direction of the protrusion 21 is not the lower side but the left side in FIG.

  Further, it is desirable to provide a step on the second frame body 9B so that the welding surfaces of the second frame body 9B, the first frame body 9A, and the joint portion 19 are on the same plane. This is to prevent problems such as the forming pressure being concentrated on one side and the welding force not being uniform when the joint portion 19 is formed.

  Further, by making the thickness of the first frame 9A thinner than the thickness of the joint portion 19 and the protrusion 21, it is possible to facilitate disassembly.

  Further, another modification of the protrusion 21 is shown in FIG. The thickness of the protrusion 21 in FIG. 3C is thicker than the thickness of the joint portion 19. As a result, as will be described with reference to FIGS. 4 (a) and 4 (b) below, the protrusion 21 is likely to be peeled off from the second frame 9B during the disassembling method of the bonded body 14.

  The thickness is a dimension in the direction perpendicular to the upper surface of the first frame body 9A and the upper surface of the second frame body 9B.

<Disassembly method>
FIG. 4A and FIG. 4B are cross-sectional views showing a method for disassembling the bonded body 14 of the present embodiment. First, as shown in FIG. 4A, the second frame body 9B is warped with respect to the protrusion 21 of the joint portion 19 of the first frame body 9A, whereby the protrusion 21 is separated from the starting point. At this time, as described above, when the protrusion 21 projects in a direction in which the distance between the peripheral portion of the second frame body 9B and the boundary portion is relatively wide, there is an advantage that the gripping margin is easily bent.

  In addition, when the thickness of the joint portion 19 and the protrusion 21 is thinner than that of the second frame body 9B, when the second frame body 9B is warped, the joint portion 19 and the protrusion 21 may warp while being bonded. Therefore, it is desirable that at least one of the joint portion 19 and the protrusion 21 is relatively thicker than the thickness of the second frame body 9B.

  By separating the second frame 9B from the projection 21 as a starting point, the boundary surface between the projection 21 and the second frame 9B is separated as shown in FIG. 4B. At this time, when the adhesive strength of the joint portion 19 is strong, the joint portion 19 may be broken in the middle. Even in such a case, peeling can be restarted from the broken joint portion 19 as a starting point, and if a protrusion 21 is also formed at another diagonal corner portion of the joined body 14, peeling can be performed from the other side. Is also possible.

<Modification>
FIG. 5A and FIG. 5B are plan views showing the shape of the joint portion 19 of the frame body for facilitating peeling.

  In FIG. 5A, the protrusions 21 are provided at two opposing corner portions of the joint 19. The protrusion 21 can be peeled off from both.

  Further, as described above, in order to prevent the adhesive force of the joint portion 19 from being severely broken, in FIG. 5B, the welding width dimension of the joint portion 19 in the straight line portion other than the corner portion is changed to the corner portion. The joint portion 19 is thinner than the joint portion 19.

  This also has the effect of reducing warpage due to contraction when forming the joint portion 19 of the first frame body 9A and the second frame body 9B. If it is desired to further reduce the warp, it is desirable to reduce the thickness at the portion where the width dimension is narrowed. In this way, by removing the joint portion 19 and the second frame body 9B from the joint body 14, the MEA 10 can be taken out without damage.

  The joint portion 19 is a frame-shaped quadrilateral with an opening in the center. It may be polygonal instead of quadrangular. There are two protrusions 21, and they are located at opposing positions in the joint portion 19. Although one protrusion 21 may be provided, it is preferable that there are a plurality of protrusions. It is not necessary that all the straight portions of the joint portion 19 be thinner than the corner portions. It suffices if one straight line portion is thin.

  The examples in the above embodiments can be combined.

  INDUSTRIAL APPLICABILITY The polymer electrolyte fuel cell of the present invention is useful as a fuel cell that can recover and reuse MEA containing a noble metal from a used fuel cell and defective products in a process without damaging the fuel cell. It is useful as a power source, a power source for electric vehicles, a fuel cell used in a home cogeneration system and the like.

1 Fuel Cell Stack 2 Cell 3 Current Collector 4 End Plate 5 Spring 6 Bolt Hole 7 Fastening Bolt 8 Nut 9 Frame 9A 1st Frame 9B 2nd Frame E Location F Region G Boundary 10 MEA
11 Separator 11A Anode-side Separator 11C Cathode-side Separator 11W Cooling Water Separator 12 Manifold Hole 13 Gas Channel Groove 13A Channel Channel 13C Channel Channel 13W Cooling Channel Channel 14 Assembly 15 Electrolyte Membrane 16 Anode Catalyst Layer 17 Cathode Catalyst Layer 18 Gas diffusion layer 19 Bonding part 21 Protrusion 22 Anode electrode 23 Cathode electrode 24 Separation part 101 MEA
102 Bolt hole 103 Manifold hole 104 Gasket 105 Frame 106 Cut line

Claims (12)

An electrolyte membrane,
A joined body including a frame for holding the electrolyte membrane,
The frame body includes a first frame body that holds one surface of the electrolyte membrane and a second frame body that holds the other surface of the electrolyte membrane.
Furthermore, it has a joint portion that connects the first frame body and the second frame body,
The joint is to have a protruding portion,
The joint and the protrusion are sheet-shaped, and the thickness of the protrusion is thicker than the thickness of the joint. An electrolyte membrane,
A joined body including a frame for holding the electrolyte membrane,
The frame body includes a first frame body that holds one surface of the electrolyte membrane and a second frame body that holds the other surface of the electrolyte membrane.
Furthermore, it has a joint portion that connects the first frame body and the second frame body,
The joint is a joint having a protrusion ,
The joint portion is a frame-shaped polygon in a plan view, and has the protrusions at its corners,
The joint is sheet-shaped,
A joined body in which a width of the joint portion at a corner portion of the polygon is larger than a width of the joint portion at a portion other than the corner portion of the polygon. An electrolyte membrane,
A joined body including a frame for holding the electrolyte membrane,
The frame body includes a first frame body that holds one surface of the electrolyte membrane and a second frame body that holds the other surface of the electrolyte membrane.
Furthermore, it has a joint portion that connects the first frame body and the second frame body,
The joint is to have a protruding portion,
The joint portion is located across the first surface of the first frame body and the second surface of the second frame body,
The protrusion projects in a direction parallel to the first surface and the second surface,
The protrusion is a joined body located only on the upper surface of the second frame. An electrolyte membrane,
A joined body including a frame for holding the electrolyte membrane,
The frame body includes a first frame body that holds one surface of the electrolyte membrane and a second frame body that holds the other surface of the electrolyte membrane.
Furthermore, it has a joint portion that connects the first frame body and the second frame body,
The joint is to have a protruding portion,
The joint portion is located across the first surface of the first frame body and the second surface of the second frame body,
The protrusion projects in a direction parallel to the first surface and the second surface,
The said protrusion is a solid joined body. The joined body according to any one of claims 1 to 4, wherein the joined portion is a frame-shaped polygon in a plan view, and has the protrusions at its corners. The joined body according to claim 5 , wherein the polygon is a quadrangle. There are two protrusions,
The joined body according to any one of claims 1 to 6, wherein the positions of the two protruding portions are positions facing each other in the joined portion. The joint portion and the first frame are sheet-shaped,
The joined body according to any one of claims 1 to 8 , wherein the joined portion has a thickness greater than that of the second frame body. The protrusion is a sheet shape, and the thickness of the protrusions assembly according to any one of the second frame of thicker claim than the thickness 1-8. The second frame, the thickness has a thin portion, assembly according to any one of claims 1 to 9 wherein said first frame to said thin portion is located. The joined body according to any one of claims 1 to 10 ,
A fuel cell assembled by stacking a plurality of unit cell modules each having a pair of separators sandwiching the joined body. A peripheral portion of the electrolyte membrane is sandwiched between a second frame body and a first frame body having an outer diameter smaller than that of the second frame body,
The joining portion of the second frame body and the first frame body is covered with a joint portion,
A method for disassembling a joined body, wherein the joint portion is provided with a protrusion,
A first step of deforming the peripheral portion of the second frame body on the projecting direction side of the projection so as to warp and peeling the projection from the second frame body;
A method of disassembling a bonded body, comprising a second step of peeling the bonded portion and the first frame body from the second frame body by the protrusion.

Images