JP2017016830A - Seal member for fuel cell, seal member unit, and arrangement method for seal member for fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member for a fuel cell which improves positioning accuracy in relative to an arrangement target member, a seal member unit in which the seal member for a fuel cell is temporarily arranged, and an arrangement method for the seal member for a fuel cell.SOLUTION: A seal member 2 for a fuel cell is temporarily arranged in an arrangement target member 4 and then arranged in a fuel cell 9. The seal member 2 for a fuel cell is a unit molding made of elastomer comprising a frame-shaped seal body 20 including a seal lip 200, and a positioning body 21 which is positioned in the arrangement target member 4.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fuel cell, for example, a fuel cell seal member interposed between a pair of adjacent cell assemblies, a seal member unit in which a fuel cell seal member is disposed, and a method for arranging a fuel cell seal member. .

  Patent Documents 1 and 2 disclose techniques for positioning a fuel cell seal member on a separator. Patent Document 3 discloses a technique for positioning a pair of fuel cell sealing members. That is, Patent Documents 1 to 3 disclose techniques relating to positioning of a pair of stacked members facing each other in the stacking direction of the fuel cells.

JP 2011-192484 A JP 2009-99422 A JP 2004-178978 A

  By the way, due to the recent demand for fuel cell miniaturization, a reduction in the thickness of the fuel cell seal member has been studied. The fuel cell seal member is flexible. For this reason, when the fuel cell seal member is thinned, the fuel cell seal member is likely to be twisted or entangled. That is, the fuel cell seal member is easily deformed.

  However, when the fuel cell seal member production site is separated from the fuel cell assembly site, it is necessary to transport the fuel cell seal member from the production site to the assembly site by means of transportation such as a truck. . In addition, before assembling the fuel cell, the performance of the fuel cell sealing member may be inspected in advance before assembling the fuel cell regardless of the distance between the production site and the assembly site. In this respect, the thin fuel cell sealing member is easily deformed by vibration during transportation or inspection.

  Therefore, the present inventor has considered temporarily arranging the thin fuel cell seal member on the arrangement target member before incorporating it into the fuel cell. When the fuel cell seal member is temporarily arranged on the arrangement target member, deformation of the fuel cell seal member can be suppressed after the temporary arrangement.

  However, when the fuel cell seal member is temporarily arranged on the arrangement target member, the fuel cell seal member is easily twisted or entangled. For this reason, it is difficult to arrange the fuel cell sealing member in a desired shape. In other words, it is difficult to arrange the fuel cell sealing member at a predetermined position of the arrangement target member.

  Then, an object of this invention is to provide the arrangement | positioning method of the sealing member for fuel cells, a sealing member unit, and the sealing member for fuel cells with high positioning accuracy with respect to the arrangement | positioning object member.

  (1) In order to solve the above-described problem, the fuel cell seal member of the present invention is a fuel cell seal member that is temporarily placed on the placement target member and then placed on the fuel cell, and has a seal lip. It is an elastomer single-piece | molding product provided with a shape-like seal main body and the positioning body positioned by the said arrangement | positioning object member. Here, the “arrangement target member” includes a member (relay member to the fuel cell) in which the fuel cell seal member is temporarily arranged before the assembly of the fuel cell. On the other hand, the “arrangement target member” does not include a member (a laminated member of the fuel cell) on which the fuel cell seal member is disposed after the fuel cell is assembled. Examples of the “placement target member” include a transport member for transporting the fuel cell seal member, a packing member for packing the fuel cell seal member, and an inspection member on which the fuel cell seal member is disposed at the time of inspection. Is included.

  The fuel cell seal member of the present invention includes a positioning body. The positioning body is positioned on the arrangement target member. For this reason, according to the sealing member for fuel cells of this invention, the positioning accuracy with respect to the arrangement | positioning object member can be improved. Further, the positioning operation of the fuel cell sealing member with respect to the arrangement target member can be easily performed. Moreover, the positioning body is arrange | positioned at the sealing member for fuel cells separately from the seal main body. For this reason, it is difficult for the seal body to be affected by the positioning body positioned on the arrangement target member.

  (2) In the configuration of (1) above, the arrangement target member has an arrangement target member side first positioning portion, and the positioning body is positioned on the arrangement target member side first positioning portion. It is better to have a configuration having a positioning part and a connecting part that connects the seal body and the sealing member side positioning part.

  The arrangement target member includes an arrangement target member side first positioning portion. On the other hand, the positioning body includes a seal member side positioning portion. By positioning the seal member side positioning portion to the arrangement target member side first positioning portion, the positioning operation of the fuel cell seal member with respect to the arrangement target member can be easily performed. Moreover, the positioning accuracy of the fuel cell sealing member with respect to the arrangement target member can be improved. Further, a connecting portion is interposed between the seal body and the seal member side positioning portion. For this reason, the sealing function of the seal lip is unlikely to deteriorate.

  (3) In the configuration of (2), it is preferable that the arrangement target member-side first positioning portion is a concave portion, and the seal member-side positioning portion is a convex portion inserted into the concave portion. . According to this configuration, the positioning operation of the fuel cell seal member with respect to the arrangement target member can be easily performed by inserting the convex portion into the concave portion.

  (3-1) In the configuration of (3), the seal body is interposed between a pair of stacked members facing each other in the stacking direction of the fuel cell, and the convex portion does not interfere with the stacked member. Better to do. Here, the “laminated member” includes, for example, a cell assembly, a separator, an electrode member, and the like. Further, the difference between the pair of laminated members in the “pair of laminated members facing in the lamination direction” is not limited. For example, “separator and separator”, “separator and electrode member”, and the like may be used.

  According to this configuration, the seal lip of the seal body is in elastic contact with the laminated member. However, the convex part does not interfere with the laminated member. For this reason, a convex part does not hinder the sealing function of a seal lip.

  (3-2) In the configuration of the above (3), the positioning body is preferably arranged outside the frame of the seal body. According to this configuration, after the fuel cell is assembled, the positioning body is unlikely to interfere with a member disposed inside the frame of the seal body.

  (3-3) In the configuration of (3), it is preferable that the outer peripheral surface of the convex portion and the inner peripheral surface of the concave portion have a tapered surface shape pointed in the insertion direction of the convex portion. According to this configuration, when the convex portion is inserted into the concave portion, the convex portion can be positioned with respect to the concave portion by sliding the outer peripheral surface of the convex portion against the inner peripheral surface of the concave portion.

  (4) In the configuration of (3) above, it is preferable that the positioning body has a conveying convex portion disposed on the opposite side of the convex portion with the stacking direction of the fuel cells as a front-back direction. Good.

  Here, the “stacking direction” refers to a direction in which a plurality of cell assemblies of the fuel cell are stacked. According to this structure, the conveyance convex part is arrange | positioned at the positioning body. For this reason, when the fuel cell seal member is conveyed to the arrangement target member, the seal main body is not easily affected by the conveyance.

  (5) In the configuration of (3) or (4) above, the stacking direction of the fuel cells is the front and back direction, and the connecting portion has a thickness smaller in the front and back direction than the seal body and the convex portion. Better. According to this configuration, the connecting portion has lower rigidity than the seal body and the convex portion. For this reason, a connection part can be deform | transformed preferentially with respect to a seal | sticker main body and a convex part.

  (6) In the configuration according to any one of (3) to (5), the stacking direction of the fuel cells is a front and back direction, the front and back direction thickness of the convex portion is 0.3 mm or more, The length from the center axis of the seal lip to the center axis of the convex part is preferably 1.5 mm or more and 6.0 mm or less. Here, the “transverse section” refers to a cross section in a direction orthogonal to the extending direction of the seal body.

  The reason why the thickness of the convex portion in the front-back direction is set to 0.3 mm or more is that when it is less than 0.3 mm, positioning work becomes difficult. The reason why the length from the center axis of the seal lip to the center axis of the convex portion in the cross section is 1.5 mm or more is that when the length is less than 1.5 mm, the sealing function of the seal lip is likely to deteriorate. The reason why the length from the center axis of the seal lip to the center axis of the convex portion in the cross section is 6.0 mm or less is that when it exceeds 6.0 mm, the seal lip abuts against the arrangement target member during positioning work. This is because the formed seal line is easy to meander. That is, the positioning accuracy is likely to decrease.

(7) In the configuration of any one of the above (1) to (6), it is preferable that the cross-sectional secondary moment of the seal body is 0.03 mm ⁴ or more. The reason why the sectional moment of inertia of the seal body is set to 0.03 mm ⁴ or more is that when it is less than 0.03 mm ⁴ , the seal body becomes excessively soft.

  (8) In order to solve the above-described problem, a seal member unit according to the present invention includes the fuel cell seal member according to any one of (1) to (7) and the arrangement on which the fuel cell seal member is placed. And a target member.

  The seal member unit of the present invention includes a fuel cell seal member and an arrangement target member. The fuel cell sealing member is placed on the arrangement target member. The positioning body of the fuel cell seal member is positioned on the arrangement target member. For this reason, according to the seal member unit of the present invention, it is possible to improve the positioning accuracy of the fuel cell seal member with respect to the arrangement target member. Further, the positioning operation of the fuel cell sealing member with respect to the arrangement target member can be easily performed. Moreover, the positioning body is arrange | positioned at the sealing member for fuel cells separately from the seal main body. For this reason, it is difficult for the seal body to be affected by the positioning body positioned on the arrangement target member.

  (9) In order to solve the above problems, the fuel cell seal member disposing method of the present invention is the fuel cell seal member disposing method of (4) above in which the fuel cell seal member is disposed in the disposition target member. And gripping the transport convex portion with a transport chuck, transporting the fuel cell seal member to the arrangement target member, and inserting the convex portion into the concave portion, thereby It has the conveyance process positioned to a member to be arranged, It is characterized by the above-mentioned.

  According to the arrangement method of the fuel cell seal member of the present invention, the fuel cell seal member can be transported using the transport chuck. For this reason, the fuel cell seal member is less likely to be twisted or entangled as compared with the case where it is conveyed manually. That is, the fuel cell seal member is not easily deformed. Therefore, the handleability of the fuel cell seal member is excellent. Moreover, the positioning accuracy of the fuel cell sealing member with respect to the arrangement target member can be improved.

  (10) In the configuration of (9), a frame jig arranging step of arranging a frame jig at a predetermined position of the arrangement target member after the carrying step, and a predetermined position inside the frame of the frame jig It is preferable that the fuel cell sealing member is positioned on the separator via the arrangement target member and the frame jig.

  In the conveying step, the fuel cell seal member can be positioned with respect to the arrangement target member by inserting the convex portion into the concave portion. In the frame jig arrangement step, the frame jig can be positioned with respect to the arrangement target member by arranging the frame jig at a predetermined position of the arrangement target member. In the separator arranging step, the separator can be positioned with respect to the frame jig by arranging the separator at a predetermined position inside the frame of the frame jig.

  Thus, according to this configuration, the fuel cell seal member can be positioned with respect to the separator via the arrangement target member and the frame jig. In addition, the fuel cell sealing member can be disposed on the separator before the fuel cell is assembled.

  (11) In the configuration of (10), the arrangement target member includes an arrangement target member side second positioning portion, and the frame jig includes a frame jig side first positioning portion and a frame jig side first positioning portion. Two positioning portions, and in the frame jig placement step, the frame jig side first positioning portion is positioned on the placement target member side second positioning portion, and in the separator placement step, the separator is It is better to have a configuration in which the frame jig side second positioning portion is positioned.

  According to this configuration, in the frame jig arrangement step, the frame jig side first positioning portion is positioned by the arrangement target member side second positioning portion, whereby the frame jig can be positioned with respect to the arrangement target member. . Moreover, in a separator arrangement | positioning process, positioning of the separator with respect to a frame jig | tool can be performed by positioning a separator in the frame jig | tool side 2nd positioning part.

  (12) In the configuration of the above (11), the arrangement target member side second positioning portion is an arrangement target member side convex portion protruding upward, and the frame jig side first positioning portion is opened downward. The frame jig side concave portion, and the frame jig side second positioning portion is a frame jig side convex portion protruding inside the frame, and in the frame jig arrangement step, the arrangement target member side convex portion Is inserted into the frame jig side recess, and in the separator arranging step, the frame jig side protrusion is preferably in contact with the outer edge of the separator.

  According to this configuration, in the frame jig placement step, the placement target member side convex portion is inserted into the frame jig side concave portion, whereby the frame jig can be positioned with respect to the placement target member. Further, in the separator arranging step, the positioning of the separator with respect to the frame jig can be performed by the convex part on the frame jig side coming into contact with the outer edge of the separator.

  ADVANTAGE OF THE INVENTION According to this invention, the arrangement | positioning method of the sealing member for fuel cells, a sealing member unit, and the sealing member for fuel cells with the high positioning precision with respect to an arrangement | positioning object member can be provided.

It is an up-down direction sectional view of a fuel cell in which a fuel cell seal member of a first embodiment is arranged. It is a top view of the sealing member for the fuel cell arranged on the upper surface of the separator. It is the III-III direction sectional drawing of FIG. It is a schematic diagram of the shaping | molding process of the arrangement method of the sealing member for fuel cells of 1st embodiment. It is a schematic diagram of the front stage of the conveyance process of the arrangement method of the sealing member for fuel cells. FIG. 6 is an enlarged view in a circle VI in FIG. 5. It is a schematic diagram of the latter stage of the conveyance process. (A) is a schematic diagram of the conveyance step of the conveyance process. (B) is a schematic diagram of the positioning step of the conveyance process. It is a schematic diagram of the frame jig | tool arrangement | positioning process of the arrangement | positioning method of the sealing member for fuel cells. It is a schematic diagram of the separator arrangement | positioning process front stage of the arrangement | positioning method of the sealing member for fuel cells. It is a schematic diagram of the back | latter stage of the separator arrangement | positioning process. (A) is XIIa-XIIa sectional drawing of FIG. (B) is XIIb-XIIb sectional drawing of FIG. (C) is XIIc-XIIc sectional drawing of FIG. It is a schematic diagram of the inversion process of the arrangement | positioning method of the sealing member for fuel cells. It is an up-down direction fragmentary sectional view of the fuel cell by which the sealing member for fuel cells of 2nd embodiment is arrange | positioned. It is a top view of the sealing member for fuel cells of other embodiments (the 1). It is a top view of the sealing member for fuel cells of other embodiments (the 2). It is a schematic diagram of a positioning step reproduction experiment. It is an enlarged view in the circle | round | yen XVIII of FIG.

  Hereinafter, embodiments of a fuel cell sealing member, a sealing member unit, and a method of arranging a fuel cell sealing member according to the present invention will be described. In the drawings shown below, the vertical direction corresponds to the “front and back direction” and the “stacking direction” of the fuel cell.

<First embodiment>
[Arrangement of sealing member for fuel cell]
First, the arrangement of the fuel cell sealing member of the present embodiment will be described. FIG. 1 is a cross-sectional view in the vertical direction of a fuel cell in which the fuel cell seal member of the present embodiment is disposed. As shown in FIG. 1, the fuel cell 9 includes a pair of upper and lower end plates 90, a plurality of fuel cell sealing members 2, and a plurality of cell assemblies 91.

  The cell assembly 91 includes an electrode member 92, a pair of upper and lower separators 93, and an in-cell seal member 94. The in-cell seal member 94 is made of rubber and surrounds the electrode member 92 from the outside in the horizontal direction. The pair of upper and lower separators 93 are disposed on both sides of the in-cell seal member 94 and the electrode member 92 in the vertical direction. The electrode member 92 includes an MEA (Membrane Electrode Assembly) 920 and a pair of upper and lower porous layers 921. The pair of upper and lower porous layers 921 are disposed on both sides of the MEA 920 in the vertical direction.

  The fuel cell sealing members 2 and the cell assemblies 91 are alternately stacked in the vertical direction. For this reason, the arbitrary fuel cell sealing member 2 is interposed between a pair of cell assemblies 91 (specifically, separators 93) adjacent in the vertical direction. The fuel cell sealing member 2 is flexible. For this reason, the arbitrary fuel cell sealing member 2 is in elastic contact with a pair of cell assemblies 91 adjacent in the vertical direction. The pair of upper and lower end plates 90 sandwich the laminated body of the fuel cell sealing member 2 and the cell assembly 91 from both sides in the vertical direction.

[Configuration of sealing member for fuel cell]
Next, the configuration of the fuel cell seal member of the present embodiment will be described. FIG. 2 is a top view of the fuel cell sealing member of the present embodiment disposed on the top surface of the separator. FIG. 3 shows a cross-sectional view in the III-III direction of FIG. The fuel cell sealing member 2 shown in FIG. 2 corresponds to the II portion of FIG. Further, the fuel cell sealing member 2 shown in FIG. 1 corresponds to the II cross section of FIG.

  As shown in FIG. 2, the fuel cell sealing member 2 is made of a rubber cross-linked product containing ethylene-propylene-diene rubber (EPDM) as a rubber component. The rubber is included in the concept of “elastomer” of the present invention. The fuel cell seal member 2 is a single-piece molded product (integral product) and has an endless annular and rectangular frame shape. The fuel cell seal member 2 includes a seal body 20 and a plurality of positioning bodies 21. The seal body 20 has an endless annular and rectangular frame shape (specifically, a rectangular frame shape having small rectangular frame portions at four corners). As shown in FIG. 3, the seal body 20 is formed with a seal lip 200 protruding upward. 2, the seal lip 200 is elastically contacted with the upper separator 93 shown in FIG. 1, whereby a seal line S having the same shape as the seal body 20 is formed.

  As shown in FIG. 2, the positioning body 21 is disposed on the outer side in the horizontal direction of the seal body 20 with the center of gravity G of the seal body 20 (the center of gravity G of the outer edge (thick dashed line) B1 of the seal body 20). . That is, the positioning body 21 protrudes outside the frame of the seal body 20. The plurality of positioning bodies 21 are scattered at predetermined intervals along the outer edge B1 of the seal body 20.

  As shown in FIG. 3, the positioning body 21 includes a convex portion 210, a connecting portion 211, and a conveying convex portion 212. The convex part 210 protrudes upward. The outer peripheral surface of the convex portion 210 has a tapered surface shape that is pointed from the lower side toward the upper side. The conveyance convex portion 212 protrudes downward. The convex portion 210 and the conveying convex portion 212 are arranged coaxially (on the central axis A2). The same number of the convex portions 210 and the conveying convex portions 212 are arranged. The connecting portion 211 connects the seal body 20 with the convex portion 210 and the conveying convex portion 212. The connecting portion 211 extends in the horizontal direction and in a direction orthogonal to the extending direction of the seal body 20.

  As shown in FIG. 3, the lower surface of the seal body 20, the lower surface of the connecting portion 211, and the lower surface of the convex portion 210 are continuous with each other. The front and back direction thickness T3 of the connecting portion 211 is set smaller than the front and back direction thickness T2 of the seal body 20 and the front and back direction thickness T1 of the convex portion 210.

As an example, the front-back direction thickness T1 of the convex part 210 is set to 0.3 mm or more. The length L1 from the center axis A1 of the seal lip 200 to the center axis A2 of the convex portion 210 in the transverse section of the seal body 20 (the section in the direction orthogonal to the extending direction of the seal body 20) is 1.5 mm This is set to 6.0 mm or less. The cross-sectional secondary moment of the seal body 20 is set to 0.03 mm ⁴ or more.

[Method of arranging sealing member for fuel cell]
Next, a method for arranging the fuel cell seal member of the present embodiment will be described. The arrangement method of the fuel cell seal member of the present embodiment includes a forming process, a conveying process, a frame jig arranging process, a separator arranging process, and a reversing process. The orientation of the fuel cell seal member 2 before the inversion process is opposite to the orientation of the fuel cell seal member 2 after the inversion process (for example, after assembly of the fuel cell 9 shown in FIG. 1).

{Molding process}
In FIG. 4, the schematic diagram of the shaping | molding process of the arrangement | positioning method of the sealing member for fuel cells of this embodiment is shown. The upper mold 32 is shown through. In this step, the fuel cell sealing member 2 is produced using the mold 3. As shown in FIG. 4, the mold 3 includes an upper mold 32 and a lower mold 33. The upper mold 32 can be separated from the lower mold 33. A cavity 30 is formed at the boundary between the upper mold 32 and the lower mold 33. The cavity 30 has a shape symmetrical to that of the fuel cell sealing member 2. That is, the cavity 30 includes a seal body molding part 300 and a positioning body molding part 301. The seal body molding part 300 corresponds to the seal body 20. The positioning body molding portion 301 corresponds to the positioning body 21.

  In this step, first, the raw material of the fuel cell seal member 2 (uncrosslinked rubber containing EPDM as a rubber component) is injected into the cavity 30 from an injection molding machine (not shown). Next, the raw material injected into the cavity 30 is crosslinked by heating the mold 3. By this step, the fuel cell sealing member 2 is manufactured.

{Conveyance process}
In FIG. 5, the schematic diagram of the conveyance process front stage of the arrangement | positioning method of the sealing member for fuel cells of this embodiment is shown. FIG. 6 shows an enlarged view in a circle VI of FIG. FIG. 7 shows a schematic diagram of the latter stage of the transport process. FIG. 8A shows a schematic diagram of the transport step of the transport process. FIG. 8B shows a schematic diagram of the positioning step of the transport process. 5-7, the arm part 50 and the hand part 51 (parts other than the conveyance chuck 510) are shown in a transparent manner. 8A and 8B correspond to the VIII-VIII cross section of FIG. In this process, a conveyance step and a positioning step are executed.

(Transport step)
First, the conveyance step will be described. In the transport step, the fuel cell sealing member 2 is automatically transported from the mold 3 shown in FIG. 5 to the arrangement target member 4 shown in FIG. Further, the convex portion 210 is automatically positioned with respect to the concave portion 41 by using the transport device 5.

  As shown in FIGS. 5 to 7, the transport device 5 includes an arm unit 50 and a hand unit 51. The hand unit 51 includes a plurality of transfer chucks 510. The same number of conveying chucks 510 as the conveying convex portions 212, in other words, the same number as the positioning body forming portions 301 are arranged. The arrangement of the plurality of conveyance chucks 510 corresponds to the arrangement of the plurality of conveyance convex portions 212, in other words, the arrangement of the plurality of positioning body forming portions 301. The conveyance chuck 510 includes a pair of claw portions 510a that can be automatically opened and closed. The arm unit 50 is connected to the hand unit 51. The arm unit 50 can automatically move the hand unit 51, that is, the transfer chuck 510, according to a pre-teached track.

  As shown in FIG. 7, the arrangement target member 4 includes a main body 40, a plurality of concave portions 41, a seal lip accommodating portion 42, and a pair of arrangement target member side convex portions 43. The main body 40 has a rectangular plate shape larger than the outer edge B1 of the fuel cell sealing member 2 (see FIG. 2). The seal lip accommodating portion 42 is recessed on the upper surface of the main body 40. The seal lip accommodating part 42 is open to the upper side. The seal lip accommodating portion 42 has a shape symmetrical to the seal lip 200. That is, the seal lip accommodating portion 42 has an endless annular and rectangular frame shape (specifically, a rectangular frame shape having small rectangular frame portions at four corners). The recess 41 is recessed on the upper surface of the main body 40. The recess 41 opens upward. The inner peripheral surface of the recess 41 has a tapered surface shape that is pointed from the upper side to the lower side. The concave portion 41 has a shape symmetrical to the convex portion 210. The recess 41 protrudes outside the frame of the seal lip accommodating portion 42. The plurality of concave portions 41 are scattered at predetermined intervals along the outer edge of the seal lip accommodating portion 42. The pair of arrangement target member-side convex portions 43 protrude from the upper surface of the main body 40. The pair of arrangement target member-side convex portions 43 are arranged at diagonal positions (left rear corner, right front corner) of the main body 40.

  In the transport step, first, the control device (not shown) of the transport device 5 moves the hand unit 51 to a position directly above the lower mold 33 of the mold 3. At this time, the conveyance chuck 510 is disposed immediately above the conveyance convex portion 212. Next, the control device of the transport device 5 lowers the hand unit 51 and grips the transport convex portion 212 by the pair of claw portions 510 a of the transport chuck 510. Subsequently, the control device of the transport device 5 moves the hand unit 51 to a position directly above the arrangement target member 4. At this time, the transfer chuck 510 is disposed immediately above the recess 41. Then, the control device of the transport device 5 lowers the hand unit 51 and opens the pair of claw portions 510a of the transport chuck 510 to release the transport convex portion 212. The fuel cell sealing member 2 is placed on the upper surface of the arrangement target member 4. At this time, as shown in FIG. 8A, the convex portion 210 is inserted into the concave portion 41 from above. Even if the convex portion 210 is eccentric with respect to the concave portion 41, the concave portion 41 is brought into sliding contact with the outer peripheral surface of the convex portion 210 and the inner peripheral surface of the concave portion 41 as the convex portion 210 descends. In contrast, the convex portion 210 is aligned. That is, the convex portion 210 is positioned with respect to the concave portion 41.

(Positioning step)
Next, the positioning step will be described. As shown in FIG. 8B, in the positioning step, the operator manually positions the fuel cell seal member 2 on the arrangement target member 4. That is, a part of the seal lip 200 may be detached from the seal lip accommodating portion 42. In this case, the operator inserts the seal lip 200 into the seal lip accommodating portion 42 with, for example, the finger F.

  As shown in FIG. 7, the seal member unit U including the fuel cell seal member 2 and the arrangement target member 4 is manufactured by this process. Here, the manufacturing location of the fuel cell seal member 2 where the steps up to the transport step are executed, and the assembly location of the fuel cell 9 where the steps after the frame jig arrangement step (including the frame jig arrangement step) are executed. And are separated. For this reason, the seal member unit U is transported from the production site to the assembly site by transport means such as a truck.

{Frame jig placement process}
In FIG. 9, the schematic diagram of the frame jig | tool arrangement | positioning process of the arrangement | positioning method of the sealing member for fuel cells of this embodiment is shown. In the frame jig arrangement step, the frame jig 6 is placed on the upper surface of the arrangement target member 4 of the seal member unit U. As shown in FIG. 9, the frame jig 6 includes a main body 60, a plurality of frame jig side convex portions 61, and a pair of frame jig side concave portions 63. The main body 60 has a rectangular frame shape larger than the outer edge B1 of the fuel cell sealing member 2 (see FIG. 2). The frame jig side convex portion 61 has a rectangular parallelepiped block shape. The frame jig side convex portion 61 protrudes inside the frame of the main body 60. The plurality of frame jig side convex portions 61 are distributed to the left and right edges (short edges) and the front and rear edges (long edges) of the main body 60. The pair of frame jig side recesses 63 penetrates the main body 60 in the vertical direction. The pair of frame jig side recesses 63 are arranged at diagonal positions (left rear corner, right front corner) of the main body 60.

  As shown by the alternate long and short dash line in FIG. 9, in this step, the frame jig 6 is placed on the upper surface of the arrangement target member 4. At this time, the pair of arrangement target member side convex portions 43 of the arrangement target member 4 are relatively inserted into the pair of frame jig side concave portions 63 of the frame jig 6. By the insertion, the frame jig 6 is positioned with respect to the arrangement target member 4.

{Separator placement process}
In FIG. 10, the schematic diagram of the separator arrangement | positioning process front stage of the arrangement | positioning method of the sealing member for fuel cells of this embodiment is shown. FIG. 11 shows a schematic diagram of the latter stage of the separator arranging step. FIG. 12A is a cross-sectional view taken along the line XIIa-XIIa in FIG. FIG. 12B is a cross-sectional view taken along the line XIIb-XIIb in FIG. FIG. 12C is a cross-sectional view taken along the line XIIc-XIIc in FIG.

  As shown in FIGS. 10 and 11, in this step, the separator 93 is placed on the upper surface of the arrangement target member 4. In addition, the separator 93 is disposed inside the frame of the frame jig 6. At this time, the frame jig side convex portions 61 on both the left and right edges of the frame jig 6 are brought into contact with the left and right edges of the separator 93. By this contact, the separator 93 is positioned in the left-right direction with respect to the frame jig 6. In addition, the frame jig side convex portions 61 on both front and rear edges of the frame jig 6 are brought into contact with both front and rear edges of the separator 93. By this contact, the separator 93 is positioned in the front-rear direction with respect to the frame jig 6.

  In summary, as shown in FIG. 12A, the fuel cell seal member 2 is positioned with respect to the arrangement target member 4 by inserting the convex portion 210 into the concave portion 41. As shown in FIG. 12B, the positioning of the separator 93 with respect to the frame jig 6 is performed by bringing the frame jig side convex portion 61 of the inner edge of the frame jig 6 into contact with the outer edge of the separator 93. As shown in FIG. 12C, by inserting the arrangement target member side convex portion 43 of the arrangement target member 4 into the frame jig side concave portion 63 of the frame jig 6, the frame jig 6 with respect to the arrangement target member 4 is arranged. Positioning is performed. In this manner, the fuel cell seal member 2 is positioned with respect to the separator 93 via the arrangement target member 4 and the frame jig 6.

{Inversion process}
In FIG. 13, the schematic diagram of the inversion process of the arrangement | positioning method of the sealing member for fuel cells of this embodiment is shown. As shown in FIG. 13, in this step, the orientation of the separator 93 with the fuel cell seal member 2 positioned (the separator 93 on the upper side and the fuel cell seal member 2 on the lower side) is turned upside down. That is, the orientation shown in FIG. 1 (the fuel cell sealing member 2 is on the upper side and the separator 93 is on the lower side).

  Thereafter, for example, another separator 93 is disposed on the upper side of the fuel cell seal member 2 and the seal function of the seal line S shown in FIG. 2 is inspected. Then, the separator 93 with the fuel cell seal member 2 is assembled into the cell assembly 91 and the cell assembly 91 is laminated, thereby producing a laminate of the fuel cell seal member 2 and the cell assembly 91. As shown in FIG. 1, the fuel cell 9 is assembled by sandwiching the laminated body from both sides in the vertical direction with a pair of upper and lower end plates 90. As shown by a dotted line in FIG. 1, the positioning body 21 of the fuel cell sealing member 2 disposed on the uppermost side is cut off because it interferes with the upper end plate 90.

[Function and effect]
Next, the effect of the arrangement method of the fuel cell seal member, the seal member unit, and the fuel cell seal member of the present embodiment will be described. As shown in FIGS. 8A and 8B, the positioning body 21 of the fuel cell sealing member 2 is positioned on the arrangement target member 4. For this reason, the positioning accuracy of the fuel cell seal member 2 with respect to the arrangement target member 4 can be improved. Further, the positioning operation of the fuel cell seal member 2 with respect to the arrangement target member 4 can be easily performed. The positioning body 21 is disposed on the fuel cell seal member 2 separately from the seal body 20. For this reason, the seal body 20 is not easily affected by the positioning body 21 being positioned on the arrangement target member 4.

  As shown in FIGS. 8A and 8B, the arrangement target member 4 includes a recess 41 that opens upward. On the other hand, the positioning body 21 includes a convex portion 210 that protrudes downward. By inserting the convex portion 210 into the concave portion 41, the positioning operation of the fuel cell seal member 2 with respect to the arrangement target member 4 can be easily performed. Further, a connecting portion 211 is interposed between the seal body 20 and the convex portion 210. For this reason, the sealing function of the seal lip 200 is unlikely to deteriorate.

  As shown in FIG. 1, the seal lip of the seal body 20 is in elastic contact with the upper separator 93. However, the convex portion 210 does not interfere with the upper separator 93. For this reason, the convex part 210 is hard to inhibit the sealing function of a seal lip.

  As shown in FIGS. 1 and 2, the positioning body 21 is disposed outside the frame of the seal body 20. For this reason, after the fuel cell 9 is assembled, the positioning body 21 does not easily interfere with a member disposed inside the frame of the seal body 20.

  As shown in FIG. 5 to FIG. 8, a conveying convex portion 212 is arranged on the positioning body 21. For this reason, when the fuel cell seal member 2 is transported from the mold 3 to the arrangement target member 4, the seal main body 20 is not easily affected by the transport.

  As shown in FIG. 3, the front / back direction thickness T3 of the connecting portion 211 is set smaller than the front / back direction thickness T2 of the seal body 20 and the front / back direction thickness T1 of the convex portion 210. For this reason, the connecting portion 211 is less rigid than the seal body 20 and the convex portion 210. Therefore, the connecting portion 211 can be preferentially deformed with respect to the seal body 20 and the convex portion 210. Further, as shown by a dotted line in FIG. 1, when the positioning body 21 is cut from the seal body 20 after the fuel cell 9 is assembled, the connecting portion 211 is easily cut.

As shown in FIG. 3, the thickness T1 of the convex part 210 is set to 0.3 mm or more. For this reason, positioning work is easy. Further, in the cross section of the seal body 20, the length L1 from the center axis A1 of the seal lip 200 to the center axis A2 of the convex portion 210 is set to 1.5 mm or more and 6.0 mm or less. For this reason, the sealing function of the seal lip 200 is unlikely to deteriorate. Further, the seal line S (see FIG. 2) formed by the seal lip 200 coming into contact with the arrangement target member 4 during the positioning operation is difficult to meander. Moreover, the cross-sectional secondary moment of the seal body 20 is set to 0.03 mm ⁴ or more. For this reason, the seal body 20 does not become excessively soft.

  As shown in FIGS. 8A and 8B, the outer peripheral surface of the convex portion 210 and the inner peripheral surface of the concave portion 41 have a tapered surface shape that is pointed from the upper side to the lower side, that is, in the insertion direction of the convex portion 210. ing. For this reason, when the convex portion 210 is inserted into the concave portion 41 from above, the convex portion 210 can be positioned with respect to the concave portion 41 by sliding the outer peripheral surface of the convex portion 210 against the inner peripheral surface of the concave portion 41. it can.

  As shown in FIG. 4, the thickness in the front and back direction of the fuel cell seal member 2 produced in the molding step is small. That is, the fuel cell sealing member 2 is thin. For this reason, the fuel cell sealing member 2 is inherently easily twisted or entangled due to the influence of molding shrinkage or the like. That is, the fuel cell sealing member 2 is inherently easily deformed. In this regard, as shown in FIGS. 5 to 7, in the transporting process, the fuel cell sealing member 2 is transported from the mold 3 to the placement target member 4 by the transporting chuck 510 of the transporting device 5. For this reason, compared with the case where it conveys manually, the sealing member 2 for fuel cells is hard to be twisted or entangled. That is, the fuel cell seal member 2 is not easily deformed. Therefore, the handleability of the fuel cell sealing member 2 is excellent. Further, the positioning accuracy of the fuel cell seal member 2 with respect to the arrangement target member 4 can be improved.

  As shown in FIG. 12A, in the transport process, the fuel cell seal member 2 can be positioned with respect to the arrangement target member 4 by inserting the convex portion 210 into the concave portion 41. As shown in FIG. 12 (c), in the frame jig placement step, the placement target member side convex portion 43 of the placement target member 4 is inserted into the frame jig side concave portion 63 of the frame jig 6, thereby placing the placement target. The frame jig 6 can be positioned with respect to the member 4. As shown in FIG. 12B, in the separator placement step, the frame jig side convex portion 61 of the inner edge of the frame jig 6 is brought into contact with the outer edge of the separator 93, thereby Positioning can be performed. Thus, the fuel cell sealing member 2 can be positioned with respect to the separator 93 via the arrangement target member 4 and the frame jig 6. Further, the fuel cell sealing member 2 can be disposed on the separator 93 in a state before the fuel cell 9 is assembled.

  As shown in FIG. 8A, the convex portion 210 is automatically inserted into the concave portion 41 in the conveying step of the conveying step. For this reason, as shown in FIG.8 (b), in the positioning step of a conveyance process, the sealing member 2 for fuel cells is hard to be twisted or entangled. In addition, the operator can easily position the seal lip 200 with reference to the convex portion 210 already inserted into the concave portion 41. As shown in FIG. 3, the front / back direction thickness T3 of the connecting portion 211 is set smaller than the front / back direction thickness T2 of the seal body 20 and the front / back direction thickness T1 of the convex portion 210. Further, as shown in FIG. 8B, in the positioning step, the lower surface of the connecting portion 211 does not contact the upper surface of the main body 40 of the arrangement target member 4. For this reason, a frictional force does not act between the connection part 211 and the main body 40. Therefore, the connecting portion 211 is easily deformed. Therefore, the operator can easily position the seal lip 200.

<Second embodiment>
The difference between the present embodiment and the first embodiment is that the positioning body is in elastic contact with the pair of separators after assembly of the fuel cell. Here, only differences will be described. FIG. 14 is a partial sectional view in the vertical direction of the fuel cell in which the fuel cell sealing member of the present embodiment is arranged. In addition, about the site | part corresponding to FIG. 1, it shows with the same code | symbol.

  As shown in FIG. 14, a positioning body 21 is interposed between the pair of upper and lower separators 93 in addition to the seal body 20. The convex portion 210 of the positioning body 21 is in elastic contact with the upper separator 93. The conveying convex portion 212 of the positioning body 21 is in elastic contact with the lower separator 93.

  The present embodiment and the first embodiment have the same operational effects with respect to the parts having the same configuration. In the unloaded state, the positioning body 21 has a thickness smaller than that of the seal body 20 in the front and back direction (stacking direction and vertical direction). For this reason, after the fuel cell 9 is assembled, the positioning body 21 is unlikely to hinder the sealing function of the seal body 20.

<Others>
The embodiments of the fuel cell seal member, the seal member unit, and the method of arranging the fuel cell seal member according to the present invention have been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  As shown in FIG. 8A and FIG. 8B, in the above embodiment, the convex portion 210 is used as the “sealing member side positioning portion” of the present invention, and the “placement target member side first positioning portion of the present invention”. As shown in FIG. However, a concave portion that opens downward as the “seal member-side positioning portion” and a convex portion that protrudes upward as the “arrangement target member-side first positioning portion” may be disposed.

  As shown in FIG. 9, in the above embodiment, the arrangement target member-side convex portion 43 is used as the “placement target member-side second positioning portion” of the present invention as the “frame jig side first positioning portion” of the present invention. Each of the frame jig side recesses 63 was disposed. However, the placement target member side concave portion that opens upward as the “placement target member side second positioning portion” and the frame jig side convex portion that projects downward as the “frame jig side first positioning portion” are respectively arranged. May be.

  FIG. 15 shows a top view of a fuel cell sealing member according to another embodiment (part 1). FIG. 16 is a top view of a fuel cell sealing member according to another embodiment (part 2). 15 and FIG. 16, the parts corresponding to those in FIG. As shown in FIG. 15, the positioning body 21 may be arranged inside the frame of the seal body 20 (inside the inner edge B <b> 2 (thick one-dot chain line)). As shown in FIG. 16, the plurality of positioning bodies 21 are distributed on the outer side of the frame (outside of the outer edge B1 (thick dashed line)) and the inner side of the seal body 20 (inside of the inner edge B2 (thick dashed line)). May be.

  The shape, position, and number of arrangement of the frame portion of the seal body 20 are not particularly limited. As shown in FIG. 2, when the seal body 20 has a plurality of frame portions, the “outside of the frame of the seal body 20” means the outer edge B1 of the seal body 20 around the center of gravity G of the seal body 20 (thick dashed line) ) Surface direction (horizontal direction, direction orthogonal to the front and back direction) outside. Further, “the inside of the frame of the seal body” means the inside in the surface direction of the inner edge B2 (thick dashed line) of the seal body 20 with the center of gravity G of the seal body 20 as the center.

  7 includes, for example, a conveying member for conveying the fuel cell sealing member 2, a packing member for packing the fuel cell sealing member 2, and a fuel cell sealing member 2 at the time of inspection. The inspection member etc. which are arrange | positioned are included. The arrangement target member 4 may have a tray shape, a box shape, or the like. As shown in FIG. 1, the positioning body 21 may remain on the seal body 20 after the fuel cell 9 is assembled. Further, the positioning body 21 may be excised from the seal body 20.

  The positioning mechanism of the positioning body 21 with respect to the arrangement target member 4 and the positioning mechanism of the frame jig 6 with respect to the arrangement target member 4 are not particularly limited. For example, a concavo-convex mechanism (a mechanism for inserting a convex part into a concave part), an engagement mechanism (a mechanism for locking the engaging part to the engaged part), a screwing mechanism (a mechanism for screwing a screw into the concave part), and the like. May be.

  The shape, position, and number of arrangement of the convex part 210, the conveyance convex part 212, the arrangement target member side convex part 43, the frame jig side convex part 61, the concave part 41, the frame jig side concave part 63, and the positioning body 21 are not particularly limited. The conveyance convex portion 212 may not be disposed on the fuel cell seal member 2. For example, the fuel cell seal member 2 may be conveyed by adsorbing the upper surface of the convex portion 210 shown in FIG. 6 with an adsorption nozzle.

  In the transfer step, the transfer device 5 shown in FIGS. 5 to 7 may not be used. That is, the operator may carry the fuel cell sealing member 2 from the mold 3 to the arrangement target member 4 manually.

  A plurality of fuel cell sealing members 2 may be placed on a single arrangement target member 4 shown in FIG. A plurality of cavities 30 may be arranged in a single mold 3 shown in FIG. A plurality of fuel cell sealing members 2 may be simultaneously conveyed by a single conveying device 5 shown in FIG. In the upper separator 93 shown in FIG. 14, a recess (including a hole) that opens downward may be disposed for the relief of the protrusion 210. In the lower separator 93 shown in FIG. 14, a concave portion (including a hole) that opens upward may be disposed for releasing the conveyance convex portion 212.

  The stacking direction of the fuel cells 9 shown in FIG. 1 is not particularly limited. The seal body 20 and the cell assembly 91 may be alternately stacked in the front-rear direction and the left-right direction. Further, the fuel cell seal member of the present invention may be embodied as the in-cell seal member 94 shown in FIG. In this case, the fuel cell sealing member is interposed between a pair of separators 93 facing each other in the vertical direction in the same cell assembly 91.

  The material of the fuel cell seal member 2 and the in-cell seal member 94 is not particularly limited. In addition to the rubber component, a crosslinking agent, a crosslinking aid, an adhesive component, and the like may be included. Suitable rubber components include EPDM, silicone rubber (VMQ), fluorine rubber (FKM), butyl rubber (IIR), ethylene-propylene rubber (EPM), acrylonitrile-butadiene rubber (NBR), hydrogenated acrylonitrile-butadiene rubber. (H-NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR) and the like.

  Hereinafter, a positioning step reproduction experiment performed on the fuel cell seal member of the first embodiment will be described.

  In this experiment, as shown in FIG. 8B, the positioning step of the transport process was reproduced. Specifically, the operator manually positioned the fuel cell sealing member 2 on the arrangement target member 4.

  FIG. 17 shows a schematic diagram of a positioning step reproduction experiment. FIG. 18 shows an enlarged view in a circle XVIII in FIG. In FIGS. 17 and 18, parts corresponding to those in FIG. 2 are denoted by the same reference numerals.

  As shown in FIG. 8B, in this experiment, the operator manually inserted the seal body 20 into the seal lip accommodating portion 42. As shown by the one-dot chain line in FIG. 17, the fuel cell sealing member 2 is likely to be twisted or entangled. For this reason, the work in the positioning step is difficult. Further, even when the positioning step is completed, as shown in FIG. 18, a deviation C is likely to occur between the ideally arranged seal line S and the actually arranged seal line S1.

  In this experiment, for each sample (Examples 1 to 6 in Table 1 to be described later, Comparative Example 1), after the positioning step is completed, the deviation C shown in FIG. 18 is measured at the measurement positions D1 to D6 shown in FIG. It was measured.

  The measurement of the deviation C was performed according to the following procedure. First, at the measurement positions D1 to D6, the coordinates of the seal line S (X-axis direction position and Y-axis direction position with respect to the origin O) and the seal line S1 were measured. The measurement was performed with a non-contact three-dimensional measuring instrument (Quick Vision (manufactured by Mitutoyo Corporation)). Next, the difference in the direction orthogonal to the extending direction of the seal line at two coordinates was measured. The difference was designated as deviation C.

  For each sample, an average value C1 of six deviations C was calculated. In this experiment, the positioning step reproduction experiment was performed three times for each sample. For each sample, an average value C2 of three average values C1 was calculated.

Table 1 shows the result of the positioning step reproduction experiment (see FIG. 3 for dimensions). The size of the seal body 20 of each sample (size of the outer edge B1 shown in FIG. 2) is 400 mm (long edge (front edge, rear edge)) × 200 mm (short edge (left edge, right edge)). did.

  Regarding the work speed, “○” is indicated if the time from the start of the placement work of the fuel cell seal member 2 to the placement target member 4 to the completion of the placement work is within 2 minutes, and “×” if it is over 2 minutes. did.

  As shown in Table 1, in the case of Comparative Example 1, the deviation C could not be measured excessively. For this reason, the average values C1 and C2 could not be calculated. The work speed was also slow. On the other hand, in the case of Examples 1 to 6, the average value C2 of the deviation C could be kept to 1.5 mm or less. The work speed was also fast.

  Thus, according to Examples 1-6 with respect to the comparative example 1, it turned out that the positioning accuracy of the sealing member 2 for fuel cells with respect to the arrangement | positioning object member 4 becomes high. It was also found that the work speed was increased.

2: Sealing member for fuel cell 20: Seal body 200: Seal lip 21: Positioning body 210: Convex section 211: Connection section 212: Conveyance convex section 3: Mold 30: Cavity 300: Seal body molding section 301: Positioning body molding Portion 32: Upper die 33: Lower die 4: Arrangement target member 40: Main body 41: Recess 42: Seal lip accommodating portion 43: Arrangement target member side convex portion 5: Conveying device 50: Arm portion 51: Hand portion 510: For conveyance Chuck 510a: Claw part 6: Frame jig 60: Main body 61: Frame jig side convex part 63: Frame jig side concave part 9: Fuel cell 90: End plate 91: Cell assembly 92: Electrode member 921: Porous layer 93 : Separator 94: In-cell seal member A1: Center axis A2: Center axis B1: Outer edge B2: Inner edge C: Deviation D1 to D6: Measurement position F: Finger G: Center of gravity L1: Length O: Original Point S: Seal line S1: Seal line T1 to T3: Front and back direction thickness U: Seal member unit

Claims (12)

A fuel cell sealing member that is temporarily placed on the placement target member and then placed on the fuel cell,
A frame-shaped seal body having a seal lip;
A positioning body positioned on the arrangement target member;
A fuel cell sealing member which is a single-piece product made of an elastomer. The arrangement target member has an arrangement target member side first positioning portion,
The said positioning body has a seal member side positioning part positioned by the said arrangement | positioning object member side 1st positioning part, and a connection part which connects the said seal body and the said seal member side positioning part. A fuel cell sealing member. The arrangement target member side first positioning portion is a recess,
The fuel cell sealing member according to claim 2, wherein the sealing member side positioning portion is a convex portion inserted into the concave portion. With the stacking direction of the fuel cells as the front and back direction,
The fuel cell sealing member according to claim 3, wherein the positioning body has a conveyance convex portion arranged on the opposite side of the convex portion in the front-back direction. With the stacking direction of the fuel cells as the front and back direction,
5. The fuel cell seal member according to claim 3, wherein the connecting portion has a thickness in the front-back direction smaller than that of the seal body and the convex portion. With the stacking direction of the fuel cells as the front and back direction,
The front and back direction thickness of the convex part is 0.3 mm or more,
6. The fuel cell sealing member according to claim 3, wherein a length from a center axis of the seal lip to a center axis of the convex portion in a cross section is 1.5 mm or more and 6.0 mm or less. . The fuel cell seal member according to any one of claims 1 to 6, wherein a second moment of section of the seal body is 0.03 mm ⁴ or more.   A seal member unit comprising: the fuel cell seal member according to any one of claims 1 to 7; and the arrangement target member on which the fuel cell seal member is placed. A fuel cell sealing member according to claim 4, wherein the fuel cell sealing member is disposed on the member to be disposed.
The fuel cell seal member is gripped by the transport chuck, the fuel cell seal member is transported to the placement target member, and the convex portion is inserted into the recess, whereby the fuel cell seal member is moved to the placement target member. A method for arranging a sealing member for a fuel cell, which has a conveying step of positioning on the surface. After the conveying step,
A frame jig arrangement step of arranging a frame jig at a predetermined position of the arrangement target member;
A separator placement step of placing a separator at a predetermined position inside the frame of the frame jig;
The fuel cell seal member arranging method according to claim 9, wherein the fuel cell seal member is positioned on the separator via the arrangement target member and the frame jig. The arrangement target member has an arrangement target member side second positioning portion,
The frame jig has a frame jig side first positioning portion and a frame jig side second positioning portion,
In the frame jig placement step, the frame jig side first positioning portion is positioned on the placement target member side second positioning portion,
11. The fuel cell sealing member arranging method according to claim 10, wherein in the separator arranging step, the separator is positioned at the frame jig side second positioning portion. The arrangement target member side second positioning portion is an arrangement target member side convex portion protruding upward,
The frame jig side first positioning portion is a frame jig side recess opening downward,
The frame jig side second positioning portion is a frame jig side convex portion protruding inside the frame,
In the frame jig arrangement step, the arrangement target member side convex portion is inserted into the frame jig side concave portion,
12. The fuel cell sealing member arranging method according to claim 11, wherein in the separator arranging step, the frame jig side convex portion abuts on an outer edge of the separator.

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