JP6193597B2 - Manufacturing method of fuel cell related parts, fuel cell related parts, welding jig apparatus - Google Patents

Description

  The present invention is a fuel manufactured by holding a plurality of plate-like workpieces having one or more through-holes in a stacked state and welding the plurality of plate-like workpieces along a welding site around the through-holes. The present invention relates to a battery-related component manufacturing method, a fuel cell-related component, and a welding jig apparatus used for manufacturing the same.

  Conventionally, as a fuel cell, for example, a solid oxide fuel cell (SOFC) including a solid electrolyte layer (solid oxide layer) is known. This fuel cell includes a fuel cell stack formed by stacking a plurality of fuel cells that are the minimum unit of power generation. A fuel cell has an air electrode, a fuel electrode, and a solid electrolyte layer, and generates electric power through a power generation reaction. In addition to the fuel cells, the fuel cell stack is provided with a connector plate, a separator, and the like, and a plurality of them are stacked.

  The connector plates are made of a conductive material such as stainless steel, and a pair of connector plates are disposed on both sides of the fuel cell in the thickness direction. Each connector plate ensures conduction between the fuel cells in the thickness direction. The separator is made of a metal material such as iron or aluminum and has a substantially rectangular frame shape with a rectangular opening at the center. The separator functions as a partition plate for partitioning an air chamber or a fuel chamber to which a reaction gas (oxidant gas or fuel gas) is supplied between the fuel cells. And the fuel cell is arrange | positioned inside the opening part of a separator.

  As described above, the fuel cell stack is manufactured by laminating a plurality of metal plate-like members such as connector plates and separators, and the metal plate-like members are joined by laser welding. Further, in the fuel cell stack, a plurality of through holes constituting a reaction gas supply passage and a discharge passage are formed in a connector plate, a separator, etc., and in order to ensure the airtightness of these through holes, each through hole is formed. Laser welding is performed in a closed circuit shape along the periphery of the substrate.

  Patent Document 1 discloses a welding jig device for holding two plate-like workpieces and welding them in a closed circuit shape along the outer periphery of each workpiece. In the welding jig device of Patent Document 1, a first jig member for arranging a plate-like workpiece and an opening corresponding to the shape of the plate-like workpiece are formed, and the first jig member and the plate-like workpiece are arranged. A second jig member that sandwiches the outer peripheral end portion and a third jig member that is disposed in the opening of the second jig member and presses the plate-like workpiece are provided. The third jig member is fixed to the first jig member using a fixing member such as a screw. In this welding jig apparatus, a gap is provided between the inner wall surface of the opening of the second jig member and the outer wall surface of the third jig member, and the welded portion of the plate-like workpiece is exposed through the gap. It has come to be. Further, in the welding jig device, since the two plate-like workpieces are brought into close contact with each other by pressing the inner side and the outer side of the welded portion with the respective jig members, welding can be reliably performed.

JP 2011-161450 A

  However, there are a plurality of through-holes formed in the connector plate and the separator as in the fuel cell stack, and when the closed circuit shape is welded along the periphery of the through holes, it corresponds to the closed circuit shape welding site. Thus, a plurality of inner pressing jigs (third jig members) are required. In this case, the positioning operation of these inner pressing jigs and the fixing operation using screws or the like become complicated. Further, when the closed circuit shape to be welded is small, there is no space for providing the fixing member, and the inner pressing jig cannot be fixed. Furthermore, since the welding jig apparatus is composed of a plurality of jig members and fixing members, it is considered that maintenance management of the jig apparatus becomes difficult.

  The present invention has been made in view of the above-described problems, and its object is to reduce the number of jig members and fixing members constituting the welding jig apparatus, and to ensure closed circuit-shaped laser welding. It is an object of the present invention to provide a method for manufacturing a fuel cell-related component that can be performed in the same manner. Another object is to perform laser welding along the periphery of the through-hole by the above manufacturing method, and by securely sealing the periphery of the through-hole, leakage of fluid flowing through the through-hole can be achieved. It is an object of the present invention to provide a fuel cell-related member that can reliably prevent the fuel cell. Furthermore, another object is to provide a welding jig apparatus that can reduce the number of jig members and their fixing members and can reliably perform welding in a closed circuit shape.

  As a means for solving the above problems (means 1), a plurality of plate-like workpieces having one or more through holes are held in a stacked state, and welding marks formed around the through holes are closed. A method of manufacturing a fuel cell-related component manufactured by welding the plate-like workpieces along a closed circuit-shaped welded portion so as to form a closed path, wherein a part of the closed-circuit-shaped welded portion is exposed. After fixing a plurality of the plate-shaped workpieces between the first jig member having the first opening and the fixing jig member, the first jig member is fixed to the first opening in the first jig member. A first welding step in which welding is performed by irradiating the welding site with a laser, and a second opening that exposes at least a welding site other than the welding site by the first opening in the closed circuit-shaped welding site. A second jig member having A second welding step in which welding is performed by irradiating the welding site with laser along the second opening in the second jig member after the fixing jig member is mounted instead of the first jig member. There is a method for manufacturing a fuel cell-related component.

  Therefore, according to the first aspect of the invention, a part of the closed circuit-shaped welded portion is exposed by the first opening of the first jig member, and at least the first opening is welded at the closed circuit-shaped welded portion. A welding site other than the site is exposed by the second opening of the second jig member. Accordingly, in the first welding process and the second welding process, the first jig member and the second jig member are alternately mounted and laser welding is performed in two steps, so that the first welding process and the second welding process are performed around the through hole. A welding site that could not be welded through the first opening of the one jig member can be welded through the second opening of the second jig member. As a result, the respective plate-like workpieces are welded along the closed circuit-shaped welded part to produce fuel cell-related parts. When the fuel cell-related parts are manufactured in this way, even if the number of through-holes in the plate-like workpiece increases and laser welding of a plurality of welding sites is necessary, the first without increasing the number of jig members as in the prior art. Using the jig member and the second jig member, welding in a closed circuit shape can be performed along the periphery of the through holes. Moreover, in the manufacturing method of this invention, it is not necessary to fix an inner side holding jig part using a screw like the prior art. For this reason, even if the size of the closed circuit-shaped welded portion is reduced, the plate-like workpieces can be accurately laser-welded along the welded portion.

  As another means (means 2) for solving the above-mentioned problem, a plurality of plate-like workpieces having one or more through holes are held in a stacked state, and welding is formed around the through holes. A manufacturing method of a fuel cell related part manufactured by welding the plate-like workpieces along a closed circuit-shaped welding site so as to form a closed path, the plate-like workpiece having an opening. The arrangement of the openings can be changed by rotational movement about a rotation axis orthogonal to the horizontal direction or horizontal movement along the surface direction of the plate-like workpiece, and the closed circuit shape can be changed by the openings before and after the movement. The first jig member that exposes the welded part of the first jig member is fixed in a state where the plate-shaped workpiece is sandwiched between the first jig member and the fixing jig member, and then the first jig member Said welding along the opening A first welding step in which laser is irradiated to the position, and the first jig member is rotated around a rotation axis orthogonal to the plate-like workpiece or along the surface direction of the plate-like workpiece. And a second welding step of irradiating the welded portion with laser along the opening in the first jig member and then welding the laser beam. There is a way.

  Therefore, according to the invention described in the means 2, the closed circuit-shaped welded part is exposed by the openings before and after the movement of the first jig member. Therefore, in the first welding step and the second welding step, the first jig member is moved and laser welding is performed in two steps, so that the first jig member is moved around the through hole before the first jig member is moved. A welded part that could not be welded through the opening can be welded through the opening after movement. As a result, the respective plate-like workpieces are welded along the closed circuit-shaped welded part to produce fuel cell-related parts. When the fuel cell-related parts are manufactured in this way, even if the number of through-holes in the plate-like workpiece increases and laser welding of a plurality of welding sites is necessary, the first without increasing the number of jig members as in the prior art. A closed circuit-shaped welding can be performed along the periphery of these through-holes using a jig member. Moreover, in the manufacturing method of this invention, it is not necessary to fix an inner side holding jig part using a screw like the prior art. For this reason, even if the size of the closed circuit-shaped welded portion is reduced, the plate-like workpieces can be accurately laser-welded along the welded portion.

Further, as another means (means 3) for solving the above-described problem, a plurality of plate-like workpieces having one or more through holes are held in a stacked state, and are formed around the through holes. A fuel cell-related component in which the plate-like workpieces are laser-welded along a closed circuit-shaped welding site so that the laser welding trace becomes a closed path, and the laser welding trace is divided into a plurality of parts. There is a fuel cell-related component characterized in that it is constituted by laser welding marks and has a closed circuit shape surrounding the through hole as a whole.

Therefore, according to the invention described in the means 3 , for example, by the manufacturing method described in the means 1 or 2, the laser welding is performed in two steps to manufacture the fuel cell related parts. As a result, the welding mark by laser welding is composed of a plurality of divided laser welding marks, and these become a closed circuit-shaped laser welding mark that surrounds the through-hole as a whole. In this fuel cell-related component, laser welding can be reliably performed in a closed circuit shape along the periphery of the plurality of through holes. Therefore, even when a fluid such as reactive gas (fuel gas and oxidant gas) or liquid fuel is allowed to flow through each through-hole in fuel cell-related parts, fluid does not leak from the gaps in the welded part, ensuring sufficient battery performance. can do.

  In the fuel cell-related component, an overlap region may be provided at the end portions (starting end and terminal end) of the divided laser welding marks so that the divided laser welding marks intersect at a predetermined angle. In addition, the weld mark in the overlap region may be bent outward or inward with respect to the closed circuit shape. Here, when the ends of the divided laser welding traces are parallel to each other, the laser welding traces are thin, so if the positions of these ends shift even a little, the periphery of the through hole cannot be sealed without a closed circuit . On the other hand, by providing an overlap region so that the divided laser welding traces intersect at a predetermined angle, and bending the welding trace in the overlap region, the laser welding trace was reliably closed around the through hole. It becomes a shape. As a result, in the fuel cell-related parts, the periphery of the through hole can be reliably sealed, and leakage of fluid such as reaction gas (fuel gas and oxidant gas) or liquid fuel can be avoided.

  Examples of the plate-like workpiece constituting the fuel cell-related component include a connector plate, a frame member, and a separator. Since a separator used in a fuel cell has a thickness of 500 μm or less and a low strength, it is difficult to keep a flat plane by itself. In the present invention, even when any one of the plurality of plate-like workpieces is a separator, the inner side and the outer side of the welded portion can be pressed by the first jig member or the second jig member. The workpieces can be brought into close contact with each other and laser welding can be reliably performed on those welded parts.

  Further, as another means (means 4) for solving the above problem, a plurality of plate-like workpieces having one or more through holes are held in a stacked state, and welding is formed around the through holes. A welding jig apparatus for welding the plate-like workpieces along a closed circuit-shaped welding site so as to form a closed path, wherein the first part exposes a part of the closed circuit-shaped welding site. A first jig member having an opening; a second jig member having a second opening that exposes at least a welded portion other than the welded portion by the first opening in the closed circuit-shaped welded portion; The first jig member and the second jig member are configured to be alternately mountable, and fixed in a state where the plate-like workpiece is sandwiched between the first jig member or the second jig member. Welding comprising a jig member There is a tool apparatus.

  Therefore, according to the invention described in the means 4, the plate-like workpiece is fixed between the fixing jig member and the first jig member and fixed along the first opening of the first jig member. Plate workpieces are welded. Thereafter, the second jig member is attached to the fixed jig member instead of the first jig member, and each plate-like workpiece is welded along the second opening of the second jig member. As a result, the plate-like workpieces are welded along the closed circuit-shaped welded portion around the through hole. When the welding jig device is configured in this way, even when the number of through holes is increased, the first jig member and the second jig member are used without increasing the number of jig members as in the prior art. Thus, a closed circuit-shaped welding can be performed along the periphery of the through holes. Moreover, in the welding jig apparatus of this invention, it is not necessary to fix using a screw like the conventional inner side holding jig member. For this reason, even if the size of the closed circuit-shaped welding part is reduced, the closed circuit-shaped welding is performed along each opening by forming the corresponding first opening and second opening in each jig member. Can be done accurately. Furthermore, since the number of constituent members can be reduced as compared with the conventional welding jig apparatus, maintenance management of the welding jig apparatus can be easily performed.

  As another means (means 5) for solving the above-mentioned problem, a plurality of plate-like workpieces having one or more through holes are held in a laminated state, and welding is formed around the through holes. A welding jig device for welding the plate-like workpieces along a closed circuit-shaped welding site so as to form a closed path, and having an opening and rotating perpendicular to the plate-like workpiece The arrangement of the openings can be changed by rotational movement around the axis or horizontal movement along the surface direction of the plate-like workpiece, and the closed circuit-shaped welded part is exposed by the openings before and after the movement. A first jig member and a fixing jig member configured to be capable of mounting the first jig member and fixing the plate-shaped workpiece sandwiched between the first jig member and the first jig member. There is a characteristic welding jig device.

  Therefore, according to the invention described in the means 5, the plate-shaped workpiece is fixed in a state where the plate-shaped workpiece is sandwiched between the fixing jig member and the first jig member, and the plate-shaped workpiece is aligned along the opening of the first jig member. Are welded. Thereafter, on the fixing jig member of the welding jig apparatus, the first jig member rotates or moves around the rotation axis orthogonal to the plate-like work or the first jig along the surface direction of the plate-like work. The arrangement of the openings is changed by the horizontal movement of the member. And a plate-shaped workpiece is welded along the opening part in a 1st jig | tool member. As a result, the plate-like workpieces are welded along the closed circuit-shaped welded portion around the through hole. When the welding jig device is configured in this way, even when the number of through holes is increased, the first jig member is used around the through holes without increasing the number of jig members as in the prior art. Can be welded in a closed circuit shape. Moreover, in the welding jig apparatus of this invention, it is not necessary to fix using a screw like the conventional inner side holding jig member. For this reason, even if the size of the closed circuit-shaped welding site is reduced, the closed circuit-shaped welding can be accurately performed along the opening by forming the corresponding opening in the first jig member. . Furthermore, since the number of constituent members can be reduced as compared with the conventional welding jig apparatus, maintenance management of the welding jig apparatus can be easily performed.

In the means 4, the solid in the Teiji fixture part, among the first jig member and the second jig member, the clamp structure for clamping one of the outer peripheral portion may be provided. In this case, a laser can be irradiated to a welding part through the opening part of a 1st jig member or a 2nd jig member, without a clamp structure interfering, and laser welding can be performed reliably. Further, when the jig member is attached / detached using screws or the like as in the prior art, the attaching / detaching work becomes complicated. In the present invention, the first jig member and the second jig for the fixed jig member are used. The member can be easily attached and detached by using the clamp structure .
Further, in the above means 5, the fixing jig member may be provided with a clamp structure for clamping the outer peripheral portion of the first jig member. In this case, a laser can be irradiated to a welding part through the opening part of a 1st jig | tool member, without a clamp structure interfering, and laser welding can be performed reliably. Further, when the jig member is attached / detached using a screw or the like as in the prior art, the attachment / detachment work becomes complicated. This can be done easily by using.

The schematic perspective view which shows the fuel cell in 1st Embodiment. AA sectional view taken on the line AA of FIG. The schematic sectional drawing which shows a fuel battery cell. The top view which shows the laser welding trace in a separator. The enlarged plan view which shows the laser welding trace around a through-hole. The block diagram which shows schematic structure of a welding system. The top view which shows the welding jig apparatus in 1st Embodiment. The expanded sectional view which shows the 1st opening part in a 1st jig | tool member. The top view which shows the welding jig apparatus in 2nd Embodiment. The top view which shows the welding jig apparatus in 2nd Embodiment. The top view which shows the welding jig apparatus in 3rd Embodiment. Explanatory drawing which shows the laser welding trace in another embodiment. Explanatory drawing which shows the laser welding trace in another embodiment. Explanatory drawing which shows the laser welding trace in another embodiment.

[First Embodiment]
Hereinafter, a first embodiment in which the present invention is embodied in a fuel cell will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the fuel cell 1 of the present embodiment is a solid oxide fuel cell (SOFC). The fuel cell 1 includes a fuel cell stack 10 formed by stacking a plurality of fuel cells 11 that are the minimum unit of power generation. The fuel cell stack 10 has a substantially rectangular parallelepiped shape with a length of 180 mm × width of 180 mm × height of 80 mm. In addition, the fuel cell stack 10 has eight through holes 40 that penetrate the fuel cell stack 10 in the thickness direction. The fastening bolts 41 are inserted into the four through holes 40 at the four corners of the fuel cell stack 10, and a nut (not shown) is screwed to the lower end portion of the fastening bolt 41 protruding from the lower surface of the fuel cell stack 10. . Further, gas circulation fastening bolts 42 are inserted through the remaining four through holes 40, and nuts 43 are screwed onto both ends of the gas circulation fastening bolts 42 protruding from the upper and lower surfaces of the fuel cell stack 10. As a result, the plurality of fuel cells 11 are fixed in the fuel cell stack 10.

  As shown in FIGS. 2 and 3, the fuel cell 1 is configured by stacking a fuel cell 11, a current collector 66, and connector plates 51 and 60. The fuel cell 11 is configured by laminating an air electrode frame 52, an insulating frame 53, a separator 54, a fuel cell body 55, and a fuel electrode frame 56 in order.

  The connector plates 51 and 60 are formed in a substantially rectangular plate shape by a metal material such as stainless steel having excellent heat resistance and conductivity, and are disposed at the upper end portion and the lower end portion of the fuel battery cell 11. The thickness of the connector plates 51 and 60 is about 0.8 mm. The connector plates 51 and 60 form a gas flow path in the fuel battery cell 11 and make the adjacent fuel battery cells 11 conductive. More specifically, the connector plates 51 and 60 positioned between the adjacent fuel cells 11 serve as so-called interconnectors and partition the adjacent fuel cells 11. The connector plate 60 of the present embodiment also serves as the connector plate 51 of the fuel cell 11 adjacent to the lower side. The connector plate 51 disposed at the upper end of the fuel cell stack 10 serves as the upper end plate 12, and the connector plate 60 disposed at the lower end of the fuel cell stack 10 serves as the lower end plate 13. Both end plates 12 and 13 sandwich the fuel cell stack 10 and serve as output terminals for current output from the fuel cell stack 10. In addition, the connector plates 51 and 60 used as the end plates 12 and 13 are thicker than the connector plates 51 and 60 used as the interconnector.

  The air electrode frame 52 shown in FIGS. 2 and 3 has a thickness of about 1 mm and is formed in a substantially rectangular frame shape by a conductive material such as stainless steel. Therefore, a rectangular opening 61 that penetrates the air electrode frame 52 in the thickness direction is provided at the center of the air electrode frame 52. The insulating frame 53 is formed in a substantially rectangular frame shape by a mica sheet having a thickness of 0.5 mm. Therefore, a rectangular opening 63 that penetrates the insulating frame 53 in the thickness direction is provided at the center of the insulating frame 53. Further, the fuel electrode frame 56 has a thickness of about 2 mm and is formed in a substantially rectangular frame shape by a metal material such as stainless steel. Therefore, a rectangular opening 62 that penetrates the fuel electrode frame 56 in the thickness direction is provided at the center of the fuel electrode frame 56.

  The separator 54 of the present embodiment is a metal separator formed of a metal foil (metal plate) having a thickness of about 100 μm. The metallic separator is mainly made of a metal material mainly composed of iron and contains 3% by weight of aluminum. An alumina film is formed on the surface of the separator 54. The separator 54 has a substantially rectangular frame shape with a rectangular opening 64 penetrating in the thickness direction at the center. Further, the separator 54 is brazed to the outer peripheral portion of the fuel cell main body 55 (solid electrolyte layer 81) using a brazing material containing silver.

  The fuel cell main body 55 of the present embodiment includes a solid electrolyte layer 81, an air electrode 82, and a fuel electrode 83, and generates power by a power generation reaction. The solid electrolyte layer 81 is formed of a ceramic material such as yttria stabilized zirconia (YSZ) and has a rectangular plate shape with a thickness of 0.01 mm. The solid electrolyte layer 81 is fixed to the lower surface of the separator 54 and is disposed so as to close the opening 64 of the separator 54. The solid electrolyte layer 81 functions as an oxygen ion conductive solid electrolyte body.

  The air electrode 82 is affixed to the center of the upper surface of the solid electrolyte layer 81 and comes into contact with the air (oxidant gas) supplied to the fuel cell stack 10. On the other hand, the fuel electrode 83 is affixed to the entire lower surface of the solid electrolyte layer 81 and is in contact with the fuel gas supplied to the fuel cell stack 10. That is, the air electrode 82 and the fuel electrode 83 are arranged on both sides of the solid electrolyte layer 81. The air electrode 82 is disposed in the opening 64 of the separator 54 so as not to contact the separator 54. The fuel electrode 83 is formed of a mixture of nickel and yttria-stabilized zirconia (Ni-YSZ) and has a rectangular shape in a plan view with a thickness of 0.8 mm.

  In the fuel cell 11 of the present embodiment, the fuel chamber 15 is formed below the separator 54 by the opening 62 of the fuel electrode frame 56, the connector plate 60, and the like. A solid electrolyte layer 81 and a fuel electrode 83 are accommodated in the fuel chamber 15. In the fuel cell 11 of the present embodiment, the air chamber 16 is formed above the separator 54 by the connector plate 51, the opening 61 of the air electrode frame 52, the opening 63 of the insulating frame 53, and the like. It is like that. A current collector 66 made of a metal material such as a nickel alloy is installed on the surface side of the air electrode 82. As a result, the air electrode 82 and the connector plate 51 are electrically connected via the current collector 66.

  Further, as shown in FIG. 2, the fuel cell stack 10 includes a fuel supply path 70 that supplies fuel gas to the fuel chamber 15 of each fuel battery cell 11, and a fuel discharge path that discharges fuel gas from the fuel chamber 15. 71. The fuel supply path 70 includes a fuel supply hole 72 that extends along the axial direction at the center of the gas circulation fastening bolt 42, and a fuel supply lateral hole 73 that allows the fuel supply hole 72 and the fuel chamber 15 to communicate with each other. . The fuel discharge path 71 includes a fuel discharge hole 74 that extends in the axial direction at the center of the gas circulation fastening bolt 42, and a fuel discharge horizontal hole 75 that allows the fuel discharge hole 74 and the fuel chamber 15 to communicate with each other. ing. Accordingly, the fuel gas is supplied to the fuel chamber 15 through the fuel supply hole 72 and the fuel supply lateral hole 73 in order, and is discharged from the fuel chamber 15 through the fuel discharge lateral hole 75 and the fuel discharge hole 74 in order. Is done.

  The fuel cell stack 10 includes an air supply path (not shown) for supplying air to the air chamber 16 of each fuel battery cell 11 and an air discharge path (not shown) for discharging air from the air chamber 16. ing. The air supply path has substantially the same structure as the fuel supply path 70, and includes an air supply hole (not shown) extending in the axial direction at the center of the gas circulation fastening bolt 42, an air supply hole, and air An air supply lateral hole (not shown) for communicating the chamber 16 is formed. The air discharge path has substantially the same structure as the fuel discharge path 71, and includes an air discharge hole (not shown) extending in the axial direction at the center of the gas circulation fastening bolt 42, and an air discharge hole. And an air discharge lateral hole (not shown) for communicating the air chamber 16. Therefore, the air passes through the air supply hole and the air supply lateral hole in order and is supplied to the air chamber 16, and passes through the air discharge lateral hole and the air discharge hole in order and is discharged from the air chamber 16.

  In the fuel cell stack 10, flat metal members (plate workpieces) such as the air electrode frame 52, the fuel electrode frame 56, the separator 54, and the connector plates 51 and 60 are joined together by laser welding. FIG. 4 shows a welding portion with the fuel electrode frame 56 as viewed from the separator 54 side.

  As shown in FIG. 4, the separator 54 has a plurality of through holes 40 a at the edge in addition to the opening 64 (through hole) at the center. The air electrode frame 52, the fuel electrode frame 56, and the connector plates 51, 60 are also formed with a plurality of through holes 40a at the same position (see FIG. 3). Each through hole 40a constitutes a part of the through hole 40 (see FIGS. 1 and 2) through which the fastening bolt 41 and the gas circulation fastening bolt 42 are inserted, and includes a circular through hole and an elliptical through hole. Including holes.

  As shown in FIG. 4, a laser welding mark 100 by laser welding is formed on the outer peripheral portion of the separator 54 in order to join the fuel electrode frame 56. Furthermore, laser welding marks 110 are also formed around each through hole 40a in the separator 54 by laser welding. The laser welding mark 100 formed on the outer peripheral portion is composed of a plurality of (four in the present embodiment) divided laser welding marks 101a, 101b, 101c, and 101d, and they form a closed circuit as a whole. ing.

  As shown in FIGS. 4 and 5, each laser welding mark 110 formed around each through hole 40 a is constituted by two divided laser welding marks 111 a and 111 b, which are formed as a whole as a through hole. It has a closed circuit shape surrounding 40a. Furthermore, the divided laser welding marks 111a and 111b in the laser welding mark 110 intersect at two points that are point-symmetric with respect to the center of the through hole 40a. Further, in the separator 54 and the fuel electrode frame 56, the divided laser welding marks 111a and 111b of the laser welding mark 110 are provided at symmetrical positions in plan view.

  The ends of each of the divided laser welding marks 111a and 111b of the laser welding mark 110 are bent to the outside of the closed circuit shape, and at the bent ends, the divided laser welding marks 111a and 111b are at a predetermined angle (for example, An overlap region R1 that intersects at an angle of about 45 ° is provided.

  As shown in FIG. 4, also in the laser welding trace 100 formed on the outer peripheral portion of the separator 54, the divided laser welding traces 101 cross each other at a predetermined angle at the ends of the divided laser welding traces 101 a to 101 d. An overlapping region R1 is provided. The welding traces in the overlap region R1 (end portions of the divided laser welding traces 101a to 101d) are bent inward with respect to the closed circuit shape. In this way, by bending the welding trace in the overlap region R1 and reliably crossing the ends of the divided laser welding traces 101a to 101d, 111a, and 111b, the airtightness of the welded portion that forms a closed circuit shape is ensured. . This prevents leakage of reaction gas or the like from the through hole 40a via the welded portion.

  Although not shown, laser welding marks 100 and 110 by laser welding are similarly formed on the connector plates 51 and 60 and the like in order to join with other members such as the fuel electrode frame 56.

  In the fuel cell 1 configured as described above, for example, while the fuel cell 1 is heated to the operating temperature, the fuel gas is introduced from the fuel supply path 70 to the fuel chamber 15 and from the air supply path to the air chamber 16. Supply air. As a result, hydrogen in the fuel gas and oxygen in the air react through the solid electrolyte layer 81 (power generation reaction), and DC power is generated with the air electrode 82 as the positive electrode and the fuel electrode 83 as the negative electrode. In the fuel cell stack 10 of the present embodiment, since a plurality of fuel cells 11 are stacked and connected in series, the upper end plate 12 electrically connected to the air electrode 82 becomes the positive electrode, and the fuel The lower end plate 13 electrically connected to the pole 83 is a negative electrode.

  Next, a method for manufacturing the fuel cell 1 will be described.

  First, the fuel battery cell 11 is formed according to a conventionally known technique. Specifically, a green sheet to be the solid electrolyte layer 81 is laminated on the green sheet to be the fuel electrode 83 and fired. Further, the material for forming the air electrode 82 is printed on the solid electrolyte layer 81 and then baked. At this point, the fuel cell body 55 is formed.

  Next, the connector plates 51 and 60, the air electrode frame 52, the fuel electrode frame 56, and the separator 54 are formed by punching a metal plate made of a predetermined metal material such as stainless steel or iron. Further, the insulating frame 53 is formed by forming a mica sheet in a predetermined shape. Specifically, a commercially available mica sheet (a sheet made of a composite of mica and molding resin) is cut and formed into substantially the same shape as other members (such as the air electrode frame 52 and the fuel electrode frame 56).

  Next, the separator 54 and the fuel electrode frame 56 are joined by laser welding. This laser welding is performed using a welding system 120 shown in FIG. A welding system 120 according to the present embodiment includes a welding jig device 121, a laser irradiation device 122 disposed above the welding jig device 121, and a welding jig device 121, and the welding jig device 121. And an XY table 123 that moves the two-dimensionally in the horizontal direction.

  The welding jig apparatus 121 of the present embodiment holds a plurality of plate-like workpieces (separator 54 and fuel electrode frame 56) having a through hole 40a in a stacked state, and laser welding is formed around the through hole 40a. It is a jig device for welding plate-like workpieces along a closed circuit-shaped welding site so that the traces 100 and 110 become a closed path.

  As shown in FIGS. 6 and 7, the welding jig device 121 of the present embodiment includes a first jig member 131, a second jig member 132, a first jig member 131, and a second jig. And a fixing jig member 133 configured to be able to mount the members 132 alternately. The fixing jig member 133 is fixed in a state where the separator 54 and the fuel electrode frame 56 are sandwiched between the first jig member 131 and the second jig member 132. The fixing jig member 133 is provided with a clamp structure 135 that clamps one of the outer peripheral portions of the first jig member 131 and the second jig member 132. The clamp structures 135 are provided at eight locations corresponding to the positions of the corner portions and the intermediate points of the sides on the outer peripheral portions of the jig members 131 and 132. Further, the outer periphery of each of the jig members 131 and 132 is provided with a recess 136 that is clamped by the clamp structure 135 at a position that is an intermediate point between each corner and each side. Furthermore, a handle 37 is provided at the center of each jig member 131, 132 for the operator to hold by hand.

  The first jig member 131 is a jig member formed in a rectangular plate shape, and has a first opening 141 that exposes a part of a closed circuit-shaped welding site. The second jig member 132 is a jig member formed in a rectangular plate shape, and in the closed circuit-shaped welding part, the second opening part 142 that exposes at least a welding part other than the welding part by the first opening part 141. Have That is, the first opening 141 of the first jig member 131 is an opening for forming one of the divided laser welding marks 101a, 101c, and 111a constituting the closed circuit-shaped laser welding marks 100 and 110. The second opening 142 of the second jig member 132 is an opening for forming the other divided laser welding marks 101b, 101d, and 111b.

  As shown in FIG. 8, the first opening 141 formed in the first jig member 131 is formed in a tapered shape so that the opening area gradually increases toward the upper side, which is the irradiation side of the laser L1. Yes. Similarly, the second opening 142 formed in the second jig member 132 is also tapered so that the opening area gradually increases toward the upper side, which is the irradiation side of the laser L1.

  When the separator 54 and the fuel electrode frame 56 are welded using the welding jig device 121, first, a welding process using the first jig member 131 is performed. Specifically, the separator 54 and the fuel electrode frame 56 are stacked on the fixing jig member 133 in a state where they are aligned. Further, after the first jig member 131 is set on the fixing jig member 133, the first jig member 131 and the fixing jig member 133 are clamped by clamping the outer periphery of the first jig member 131 with the clamp structure 135. The separator 54 and the fuel electrode frame 56 are sandwiched between them.

  Thereafter, using the laser irradiation device 122, the laser L1 is irradiated under predetermined irradiation conditions (for example, the output is about 0.3 kW and the beam diameter is about 0.06 mm). As the laser irradiation device 122, for example, an irradiation device such as a carbon dioxide laser is used. Further, at the time of irradiation of the laser L1, the laser L1 is irradiated to the welded portion of the separator 54 along the first opening 141 in the first jig member 131 by moving the XY table 123 in the horizontal direction. Then, the separator 54 and the fuel electrode frame 56 are laser-welded (first welding step).

  Next, the clamp by the clamp structure 135 is released, the first jig member 131 is removed from the fixing jig member 133, and the second jig member 132 is attached to the fixing jig member 133 instead of the first jig member 131. To do. Then, while irradiating the laser L1 from the laser irradiation apparatus 122 and moving the XY table 123 in the horizontal direction, the laser is applied to the welding portion of the separator 54 along the second opening 142 in the second jig member 132. The separator 54 and the fuel electrode frame 56 are laser-welded by irradiating L1 (second welding process). Thereafter, the clamp by the clamp structure 135 is released and the second jig member 132 is removed from the fixed jig member 133. Further, the separator 54 and the fuel electrode frame 56 (fuel cell related parts) joined by laser welding are taken out from the fixing jig member 133.

  By performing the laser welding process in two steps as described above, laser welding marks 100 and 110 as shown in FIG. 4 are formed on the separator 54 and the fuel electrode frame 56.

  Thereafter, the separator 54 joined with the fuel electrode frame 56 and the like is fixed to the solid electrolyte layer 81 of the fuel cell body 55 by brazing. Specifically, after the brazing material is disposed in each of the solid electrolyte layer 81 and the separator 54, the brazing material is melted by heating at 850 to 1100 ° C. in an air atmosphere, and the solid electrolyte layer 81 and The separator 54 is joined.

  Further, a laser welding process using the same welding jig apparatus 121 as described above is performed, and the connector plate 60 is laser welded to the back side of the fuel electrode frame 56. Further, the connector plate 60 (51), the air electrode frame 52, and the like are similarly joined by laser welding.

  Thereafter, a plurality of the connector plates 51, the air electrode frame 52, the separator 54, the fuel cell main body 55, the fuel electrode frame 56, etc. and the insulating frame 53 joined as described above are stacked and integrated to form a fuel cell stack. 10 is formed. Then, the fastening bolts 41 are inserted into the four through holes 40 at the four corners of the fuel cell stack 10, and a nut (not shown) is screwed to the lower end portion of the fastening bolt 41 protruding from the lower surface of the fuel cell stack 10. . Further, gas circulation fastening bolts 42 are inserted through the remaining four through holes 40, and nuts 43 are screwed onto both ends of the gas circulation fastening bolts 42 protruding from the upper and lower surfaces of the fuel cell stack 10. As a result, each fuel cell 11 is fixed in the fuel cell stack 10 and the fuel cell 1 is completed.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the present embodiment, the first jig member 131 and the second jig member 132 are alternately mounted in the welding jig device 121 and the welding process is performed in two steps, thereby forming a closed circuit shape. Each plate-like workpiece such as the separator 54 and the fuel electrode frame 56 is welded along the welded portion. Therefore, when the welding jig device 121 of the present embodiment is used, even if the number of through holes 40a is increased and laser welding of a plurality of welding sites is required, the jig as in the prior art is used. Without increasing the number of members, the first jig member 131 and the second jig member 132 can be used to reliably perform closed-circuit laser welding along the periphery of the through holes 40a. As a result, even when a reaction gas or the like is caused to flow through each through-hole 40 in the fuel cell 1, the reaction gas does not leak from the gaps in the welded portion, and battery performance can be sufficiently ensured. Moreover, in this Embodiment, it is not necessary to fix an inner side holding jig part using a screw like the prior art. For this reason, even if the size of the closed circuit-shaped welded portion is reduced, the separator 54 and the fuel electrode frame 56 can be accurately welded along the welded portion.

  (2) In the present embodiment, the laser welding marks 100 and 110 formed on the plate-like workpiece such as the separator 54 and the fuel electrode frame 56 are constituted by a plurality of divided laser welding marks 101a to 101d, 111a, and 111b. At the end portions of the divided laser welding marks 101a to 101d, 111a, and 111b, an overlap region R1 where the divided laser welding marks intersect at a predetermined angle is provided. Furthermore, the weld mark in the overlap region R1 is bent outward or inward with respect to the closed circuit shape. In this case, since the laser welding marks 100 and 110 are surely closed around the through-hole 40a, airtightness around the through-hole 40a can be sufficiently secured, and reaction gas leakage is avoided. be able to.

  (3) In the present embodiment, a separator 54 having a thickness of about 100 μm is included as a plate-like workpiece that is to be laser welded. Since the separator 54 has low strength, it is difficult to keep a flat plane by itself. However, in the present embodiment, the first jig member 131 or the second jig member 132 can press the inner side and the outer side of the welded portion, so that the separator 54 comes into close contact with the fuel electrode frame 56 and welds them. The part can be reliably laser welded.

  (4) In the welding jig apparatus 121 of the present embodiment, the fixing jig member 133 is provided with a clamp structure 135 that clamps one of the outer peripheral portions of the first jig member 131 and the second jig member 132. It has been. In this case, the laser beam L1 can be irradiated to the welded part through the openings 141 and 142 of the first jig member 131 and the second jig member 132 without the clamp structure 135 being in the way. It can be done reliably. Moreover, when attaching / detaching a jig member using screws or the like as in the prior art, the attaching / detaching work becomes complicated, but in the present embodiment, the first jig member 131 and the fixing jig member 133 The second jig member 132 can be easily attached and detached by using the clamp structure 135.

(5) In the case of the present embodiment, since the divided laser welding marks 111a and 111b in the welding portion of the laser L1 have a gentle curved shape, laser welding can be performed smoothly and the welding portion can be made uniform. Can be joined with strength.
[Second Embodiment]

  Next, a second embodiment of the present invention will be described with reference to the drawings. 9 and 10 show a welding jig apparatus 121A of the present embodiment.

  As shown in FIGS. 9 and 10, in the present embodiment, the configuration of the welding jig device 121A is different from that of the first embodiment. Specifically, in the welding jig apparatus 121 according to the first embodiment, the first jig member 131 and the second jig member 132 are alternately mounted on the fixing jig member 133 to form a closed circuit shape. Laser welding was performed in two steps. On the other hand, in the welding jig apparatus 121A of the present embodiment, a single first jig member 131A is used, and the first jig member 131A is rotated and moved twice to perform closed circuit laser welding twice. It is configured to be divided into two.

  As shown in FIG. 4, the through-hole 40 a formed in the separator 54 as a plate-like workpiece and the laser welding mark 110 around it are provided at symmetrical positions with respect to the workpiece center point. In such a case, the welding jig apparatus 121A of the present embodiment can be used. Specifically, as shown in FIGS. 9 and 10, the welding jig apparatus 121A of the present embodiment can be mounted on the fixing jig member 133 with the first jig member 131A rotated by 180 °. It is configured. In the welding jig apparatus 121A, the arrangement of the opening 141A provided in the first jig member 131A can be changed by the rotational movement of the first jig member 131A, and the through hole 40a is formed by the opening 141A before and after the movement. A welded portion having a closed circuit shape is exposed around.

  When using this welding jig device 121A, first, the separator 54 and the fuel electrode frame 56 are arranged in a stacked state on the fixing jig member 133, and the first jig member 131A is fixed as shown in FIG. Set on the jig member 133. Then, the outer periphery of the first jig member 131A is clamped by the clamp structure 135, so that the separator 54 and the fuel electrode frame 56 are fixed between the first jig member 131A and the fixing jig member 133. To do. Then, using the laser irradiation apparatus 122, the welding part of the separator 54 is irradiated and laser-welded along the opening 141A in the 1st jig | tool member 131A (1st welding process). Thereafter, the clamp by the clamp structure 135 is once released, and the first jig member 131 </ b> A is removed from the fixing jig member 133. Then, as shown in FIG. 10, after the first jig member 131 </ b> A is rotated 180 degrees around the rotation axis orthogonal to the separator 54, the first jig member 131 </ b> A is fixed to the fixing jig. Reset to member 133. Then, the first jig member 131A is fixed by clamping the outer peripheral portion of the first jig member 131A with the clamp structure 135. Thereafter, using the laser irradiation device 122, the welding portion of the separator 54 is irradiated with the laser L1 along the opening 141A in the first jig member 131A to be welded (second welding step).

Even when the welding jig device 121A of the present embodiment is used, the laser welding process is performed in two steps, whereby the closed circuit-shaped laser welding marks 100 and 110 as shown in FIG. A pole frame 56 is formed. Therefore, the present embodiment can provide the same effects as those of the first embodiment. Further, in the welding jig apparatus 121A, as compared with the first embodiment, since only one jig member 131A having the opening 141A is required, it is easy to maintain and manage the welding jig apparatus 121A. Can do.
[Third Embodiment]

  Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 11 shows a welding jig device 121B of the present embodiment.

  As shown in FIG. 11, in the present embodiment, the configuration of the welding jig device 121B is different from that of the first embodiment. In the welding jig apparatus 121B, one first jig member 131B is used, and the first jig member 131B is horizontally moved to perform the closed circuit laser welding in two steps. .

  The welding jig device 121B of the present embodiment is configured to be able to be mounted on the fixing jig member 133 in a state where the first jig member 131B is moved in the horizontal direction (vertical direction in FIG. 11). In the welding jig apparatus 121B, the arrangement of the openings 141 and 142 provided in the first jig member 131B can be changed by the horizontal movement of the first jig member 131B, and the openings 141 and 142 before and after the movement are changed. As a result, a welded portion having a closed circuit shape is exposed around the through hole 40a. Specifically, the first jig member 131B of the present embodiment is a jig configured by connecting the first jig member 131 and the second jig member 132 of the first embodiment in the vertical direction. The opening 141 is formed in the upper half region, and the opening 142 is formed in the lower half region.

  When using the welding jig device 121B, first, the separator 54 and the fuel electrode frame 56 are arranged in a stacked state on the fixing jig member 133, and the first jig member 131B is set on the fixing jig member 133. . Here, the first jig member 131B is set with the upper half of the first jig member 131B facing the position corresponding to the separator 54. Then, the outer periphery of the first jig member 131B is clamped by the clamp structure 135 so that the separator 54 and the fuel electrode frame 56 are sandwiched between the first jig member 131B and the fixing jig member 133. To do. Then, using the laser irradiation apparatus 122, the welding part of the separator 54 is irradiated and laser-welded along each upper opening 141 in the 1st jig | tool member 131B (1st welding process). Thereafter, the clamp by the clamp structure 135 is once released, and the first jig member 131B is removed from the fixing jig member 133. Then, the first jig member 131B is horizontally moved along the surface direction of the separator 54, and then the first jig member 131B is reset to the fixing jig member 133. Here, the first jig member 131B is set with the lower half of the first jig member 131B facing the position corresponding to the separator 54. And the 1st jig | tool member 131B is fixed by clamping the outer peripheral part of the 1st jig | tool member 131B with the clamp structure 135. FIG. Thereafter, using the laser irradiation device 122, the welding portion of the separator 54 is irradiated with the laser L1 along the lower opening 142 of the first jig member 131B to be welded (second welding step).

  Even when the welding jig device 121B of the present embodiment is used, the laser welding process is performed in two steps, so that the laser welding marks 100 and 110 as shown in FIG. 4 are formed on the separator 54 and the fuel electrode frame 56. It is formed. Therefore, the present embodiment can provide the same effects as those of the first embodiment. Further, in the welding jig apparatus 121B, as compared with the first embodiment, since only one jig member 131B having the openings 141 and 142 is required, it is easy to maintain and manage the welding jig apparatus 121B. It can be carried out.

  In addition, you may change each embodiment of this invention as follows.

  In each of the above embodiments, the laser welding mark 110 formed around each through hole 40a is composed of two divided laser welding marks 111a and 111b, and the ends of the divided laser welding marks 111a and 111b are closed. Although it was bent outside the circuit shape, it is not limited to this. For example, like the laser welding mark 150 shown in FIG. 12, the welding mark in the overlap region R1 may be bent inside the closed circuit shape at the ends of the divided laser welding marks 151a and 151b. Even in this case, since the laser welding mark 150 having a closed circuit shape can be formed, sealing around the through hole 40a can be reliably performed.

  Further, as a form of the welding intersection in the overlap region R1, laser welding marks 152 and 154 as shown in FIGS. 13 and 14 may be formed. The laser welding mark 152 in FIG. 13 is also composed of two divided laser welding marks 153a and 153b. The two divided laser welding marks 153a and 153b are semicircular welding marks having slightly different diameters, and are arranged so as to be circular with the end portions overlapped. Further, the end of the divided laser welding mark 153a having a small diameter (the upper welding mark in FIG. 13) is bent at a right angle to the outside in the radial direction, and intersects the end of the divided laser welding mark 153b having a large diameter. ing. The laser welding mark 154 in FIG. 14 is also composed of two divided laser welding marks 155a and 155b. The two divided laser welding marks 155a and 155b are semicircular welding marks having the same diameter and are arranged in a circular shape. And the edge part (starting point and end point) of one division | segmentation laser welding trace 155a (upper welding trace in FIG. 14) has wide welding width, and cross | intersects the edge part of the other division | segmentation laser welding trace 155b. Yes. Even if the laser welding marks 152 and 154 as shown in FIGS. 13 and 14 are formed, the sealing around the through hole 40a can be reliably performed.

  In each of the above embodiments, each through hole 40a formed in a plate-like workpiece such as the separator 54 and the fuel electrode frame 56 has a circular shape or an elliptical shape, but a triangular or quadrangular polygonal through hole It may be. In this case, according to the shape of each of these through holes, the shape of the laser welding mark formed around the periphery may be changed as appropriate. In addition, the laser welding mark 110 formed around each through-hole 40a is composed of two divided laser welding marks 111a and 111b. However, three or more divided laser welding marks are used. It may be configured.

  In each of the above embodiments, laser welding is performed along the welded portion located on the outer peripheral portion of the separator 54 and the fuel electrode frame 56 having a substantially rectangular frame shape having the opening portions 64 and 62 (through holes) in the center. However, the present invention is not limited to this. For example, in the separator 54 and the fuel electrode frame 56, laser welding may be performed along a welding portion located in the inner peripheral portion in addition to the outer peripheral portion.

  In each of the above embodiments, two plate workpieces such as the separator 54 and the fuel electrode frame 56 are laser welded. However, three or more plate workpieces may be laser welded simultaneously.

  In each of the above embodiments, the present invention is applied to the parts (fuel cell related parts) constituting the solid oxide fuel cell (SOFC), but the invention is applied to parts constituting other fuel cells. May be applied.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the respective embodiments described above are listed below.

  (1) The method of manufacturing a fuel cell-related component according to means 1 or 2, wherein the through hole is a through hole through which a fluid passes.

  (2) In the technical idea (1), the fluid is a reaction gas of a fuel cell.

  (3) The method of manufacturing a fuel cell-related component according to means 1 or means 2, wherein any one of the plurality of plate-like workpieces is a separator having a thickness of 500 μm or less.

  (4) In means 1 or means 2, the plurality of plate-like workpieces are formed in a frame shape having a through hole in the center, and the welding is located on the outer peripheral portion and the inner peripheral portion of the plurality of plate-like workpieces. A method of manufacturing a fuel cell-related component, characterized by welding along a region.

  (5) The fuel cell-related component according to (3), wherein the weld mark in the overlap region is bent outward or inward with respect to the closed circuit shape.

  (6) A welding method in which the plate-like workpieces are laser-welded with each other using the welding jig device according to the means 4, wherein the plate-like member is interposed between the first jig member and the fixing jig member. A first welding step of welding the laser beam to the welding site along the first opening in the first jig member after fixing the workpiece in a sandwiched state; and the first jig member Instead, a second welding step of attaching the second jig member to the fixing jig member and then irradiating the welding site with laser along the second opening in the second jig member. The welding method characterized by including these.

  (7) A welding method in which the plate-like workpieces are laser-welded to each other using the welding jig device according to means 5, wherein the plate-like member is interposed between the first jig member and the fixing jig member. A first welding step of welding the laser beam to the welding site along the opening in the first jig member after fixing the workpiece in a sandwiched state; and After rotating around a rotation axis orthogonal to the workpiece, or horizontally moving along the surface direction of the plate workpiece, a laser is applied to the welding site along the opening in the first jig member. And a second welding step of welding by irradiating with.

40a ... Through-hole 51, 60 ... Connector plate as plate workpiece 52 ... Air electrode frame as plate workpiece 54 ... Separator as plate workpiece 56 ... Fuel electrode frame 100, 110, 150, 152 as plate workpiece , 154... Laser welding marks 101a to 101d, 111a, 111b, 151a, 151b, 153a, 153b, 155a, 155b ... Divided laser welding marks 121, 121A, 121B ... Welding jig devices 131, 131A, 131B ... First jig Member 132 ... Second jig member 133 ... Fixing jig member 135 ... Clamping structure 141 ... First opening 142 ... Second opening 141A ... Opening L1 ... Laser R1 ... Overlapping region

Claims (8)

A plurality of plate-like workpieces having one or more through-holes are held in a stacked state, and the plate is formed along a closed circuit-shaped welded portion so that a weld mark formed around the through-holes forms a closed path. A method for manufacturing a fuel cell-related component manufactured by welding two shaped workpieces,
After fixing a plurality of plate-shaped workpieces sandwiched between a first jig member having a first opening that exposes a part of the closed circuit-shaped welding site and a fixing jig member, A first welding step of irradiating and welding the laser to the welding site along the first opening in the first jig member;
In the closed circuit-shaped welding part, the second jig member having a second opening part that exposes at least a welding part other than the welding part by the first opening part is replaced with the first jig member and the fixing jig. And a second welding step of irradiating the welding site with a laser along the second opening in the second jig member and then welding the second jig member. Production method. A plurality of plate-like workpieces having one or more through-holes are held in a stacked state, and the plate is formed along a closed circuit-shaped welded portion so that a weld mark formed around the through-holes forms a closed path. A method for manufacturing a fuel cell-related component manufactured by welding two shaped workpieces,
The arrangement of the openings can be changed by rotational movement around the rotation axis perpendicular to the plate-like workpiece and horizontal movement along the surface direction of the plate-like workpiece. After using the first jig member to expose the closed circuit-shaped welded portion through the opening, and fixing the plate-shaped workpiece sandwiched between the first jig member and the fixing jig member A first welding step of irradiating the welding site with a laser along the opening in the first jig member and welding,
The opening in the first jig member after the first jig member is rotated around a rotation axis orthogonal to the plate workpiece or horizontally moved along the surface direction of the plate workpiece. And a second welding step of irradiating the welding site with a laser along the portion to weld the fuel cell-related component.    3. The fuel cell-related component manufactured by the manufacturing method according to claim 1, wherein the welding mark by laser welding is constituted by a plurality of divided laser welding marks, which are formed as a whole through the through hole. A fuel cell-related part characterized by having a closed circuit shape surrounding the fuel cell.    4. The fuel cell-related component according to claim 3, wherein an overlap region where the divided laser welding marks intersect at a predetermined angle is provided at an end of the divided laser welding marks. A plurality of plate-like workpieces having one or more through-holes are held in a stacked state, and the plate is formed along a closed circuit-shaped welded portion so that a weld mark formed around the through-holes forms a closed path. A welding jig apparatus for welding workpieces,
A first jig member having a first opening that exposes a portion of the welded portion of the closed circuit shape;
A second jig member having a second opening that exposes at least a welded part other than the welded part by the first opening in the closed circuit-shaped welded part;
The first jig member and the second jig member can be mounted alternately, and are fixed in a state where the plate-like workpiece is sandwiched between the first jig member or the second jig member. A welding jig device comprising: a fixing jig member. A plurality of plate-like workpieces having one or more through-holes are held in a stacked state, and the plate is formed along a closed circuit-shaped welded portion so that a weld mark formed around the through-holes forms a closed path. A welding jig apparatus for welding workpieces,
The arrangement of the openings can be changed by rotational movement around the rotation axis perpendicular to the plate-like workpiece and horizontal movement along the surface direction of the plate-like workpiece. A first jig member that exposes the closed circuit-shaped welded portion through the opening;
A welding jig apparatus comprising: a fixing jig member configured to be capable of mounting the first jig member, and fixing the plate-shaped workpiece sandwiched between the first jig member. . 6. The clamp structure according to claim 5 , wherein the fixing jig member is provided with a clamp structure that clamps an outer peripheral portion of the first jig member and the second jig member. Welding jig device.   The welding jig apparatus according to claim 6, wherein the fixing jig member is provided with a clamp structure that clamps an outer peripheral portion of the first jig member.

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