WO2022244404A1 - 燃料電池用セパレータの製造方法及び燃料電池用セパレータ - Google Patents
燃料電池用セパレータの製造方法及び燃料電池用セパレータ Download PDFInfo
- Publication number
- WO2022244404A1 WO2022244404A1 PCT/JP2022/010239 JP2022010239W WO2022244404A1 WO 2022244404 A1 WO2022244404 A1 WO 2022244404A1 JP 2022010239 W JP2022010239 W JP 2022010239W WO 2022244404 A1 WO2022244404 A1 WO 2022244404A1
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- WIPO (PCT)
- Prior art keywords
- bead
- separator
- welding
- weld
- rigidity
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000011324 bead Substances 0.000 claims abstract description 127
- 238000003466 welding Methods 0.000 claims abstract description 64
- 239000002184 metal Substances 0.000 claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 claims abstract description 56
- 241001016380 Reseda luteola Species 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 19
- 238000007789 sealing Methods 0.000 abstract description 25
- 238000004891 communication Methods 0.000 description 25
- 239000007789 gas Substances 0.000 description 12
- 239000012528 membrane Substances 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000002826 coolant Substances 0.000 description 9
- 239000002737 fuel gas Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000012495 reaction gas Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for manufacturing a fuel cell separator and a fuel cell separator.
- a fuel cell in which an electrolyte membrane is sandwiched between a pair of joined separators (hereinafter also simply referred to as "separators") to ensure sealing performance.
- the separator is formed by welding together a first metal separator and a second metal separator each having a flat portion and a convex bead portion.
- a sealing member made of rubber or the like is arranged at the tip of the bead portion.
- the bead portions of the separator face each other with the electrolyte membrane interposed therebetween to form a sealing region.
- the separator can improve the sealing performance due to the reaction force of the bead portion and the followability of the sealing member.
- a welded portion is formed along the extending direction of the bead portion in the overlapped flat portion.
- the welded portion can restrict the bead portion from expanding in the planar direction when pressure is applied in the thickness direction of the fuel cell. Thereby, the reaction force of the bead portion can be kept high, and high sealing performance can be maintained.
- the reaction force of the bead portion of the separator be constant as a whole.
- the separator is formed with a plurality of through holes, embossments, ribs, protrusions, etc., the rigidity at each position is different. Therefore, it becomes difficult to keep the reaction force of the bead portion constant.
- the present invention was invented to solve such problems, and an object of the present invention is to provide a method for manufacturing a fuel cell separator and a fuel cell separator capable of suppressing deterioration in sealing performance.
- the present invention for solving the above problems includes a step of superimposing a first metal separator and a second metal separator each having a flat portion and a bead portion protruding from the flat portion; a welding step of welding the portions together along the bead portion, wherein the welding confluence portion where the welded portions join together is positioned on the weld root to be a high-rigidity portion with high rigidity; Alternatively, it is characterized in that it is formed at a position away from the bead portion.
- the present invention also provides a fuel cell separator in which a first metal separator and a second metal separator each having a flat portion and a bead portion protruding from the flat portion are joined by welding, wherein the weld is formed by welding.
- a welding confluence portion where portions join together is formed at a position on the welding root that becomes a high-rigidity high-rigidity portion and/or at a position away from the bead portion.
- the surface pressure (linear pressure) necessary for sealing can be secured even if the reaction force of the bead portion decreases due to heat shrinkage. can be done.
- the influence of thermal contraction can be reduced or eliminated, so the surface pressure (linear pressure) required for sealing can be ensured.
- the bead portions of the first metal separator and the second metal separator each include a linear portion and a curved portion, and on the welding route, the curved portion of the bead portion It is preferable that the weld confluence is formed in the high-rigidity portion formed along the line. Further, the first metal separator and the second metal separator have ribs connected to the bead portions, and the weld confluence portion is attached to the high-rigidity portion formed at a position along the rib on the welding route. preferably formed.
- first metal separator and the second metal separator are provided with embossments, and that the weld confluence is formed in the high-rigidity portion formed along the embossments on the welding route.
- the present invention it is possible to suppress the height of the bead portion from being lowered by forming the weld confluence portion at a position along the curved portion, rib, or embossment of the bead portion, which is a highly rigid portion.
- FIG. 1 is a cross-sectional view of a separator according to Example 1.
- FIG. 1 is a cross-sectional view of a fuel cell according to Example 1.
- FIG. 1 is a plan view of a separator according to Example 1.
- FIG. 4 is an enlarged plan view of a portion Q in FIG. 3;
- FIG. 4 is an enlarged plan view of an R portion in FIG. 3;
- the first separator 3 (second separator 4) is a plate-like member used in a fuel cell, and includes a first metal separator 21, a second metal separator 22, and a plurality of sealing members. 51.
- the first metal separator 21 and the second metal separator 22 are joined by welding. Welded portions W formed by welding are formed in the overlapped flat portions 30, 30, respectively.
- the weld confluence portion where the welded portions W join together is a position and/or a bead portion of the first separator 3 (second separator 4) that is a highly rigid portion with high rigidity. is formed at a position away from the Examples will be described in detail below.
- Example 1 A fuel cell stack is obtained by stacking a plurality of fuel cells 1 shown in FIG. 2 and applying a predetermined compressive load in the stacking direction of the fuel cells 1 .
- FIG. 2 depicts the fuel cell 1 in a state of being fastened with a predetermined compressive load applied.
- the electrolyte membrane/electrode assembly (MEA: Membrane Electrode Assembly) 2 includes an electrolyte membrane 11, electrode catalyst layers 12, 12, and gas diffusion layers 13, 13.
- the electrolyte membrane 11 protrudes outside the gas diffusion layer 13 .
- the portion that protrudes outward from the gas diffusion layer 13 may be a resin film (resin frame member).
- the first separator 3 is a plate-like member arranged on one side (lower side in FIG. 2) of the electrolyte membrane/electrode assembly 2 .
- the second separator 4 is a plate-like member arranged on the other side (upper side in FIG. 2) of the electrolyte membrane electrode assembly 2 . Since the first separator 3 and the second separator 4 have the same configuration in this embodiment, the second separator 4 is assigned the same reference numerals as the first separator 3, and detailed description thereof is omitted.
- the bead seal portion 41 is formed by the bead portions 31 protruding from the flat portion 30 (see FIG. 1).
- the coupling convex portion 42 is formed by the convex portions 32 protruding from the flat portion 30 .
- the bead seal portion 41 protrudes toward the electrolyte membrane 11 (or resin film), and is formed, for example, over the entire circumference of the outer peripheral edge of the fuel cell 1 so as to be in an endless state.
- a seal member 51 is arranged along the extending direction of the bead seal portion 41 at the tip portion of the bead seal portion 41 .
- the sealing member 51 is made of an elastic material.
- the sealing member 51 of this embodiment is, for example, a gasket having a rectangular cross section.
- the seal member 51 may be formed by applying a liquid material to the bead seal portion 41 , or may be formed by attaching a belt-like material to the bead seal portion 41 .
- the sealing member 51 may be made of a material having elasticity. A resin or the like can be used.
- the bead seal portion 41 is formed by the bead portions 31, 31 protruding from the flat portion 30, so that the reaction force of the bead portion 31 can be kept high, and high sealing performance can be maintained. be able to.
- the press-molding step is a step of press-molding a material to form the first metal separator 21 and the second metal separator 22, as shown in FIG.
- the first metal separator 21 and the second metal separator 22 are, for example, thin metal plates having a thickness of about 0.03 to 0.5 mm and a hardness of Hv300 or less.
- the molded first metal separator 21 and second metal separator 22 have a flat portion 30 , one or more bead portions 31 , and one or more convex portions 32 .
- the bead portion 31 and the convex portion 32 protrude from the flat portion 30 and have a hollow portion with a trapezoidal cross section in this embodiment.
- a sealing member 51 is provided on the tip surface of the bead portion 31 . Note that the shape, number, bead height, and arrangement of the bead portion 31 and the convex portion 32 are merely examples, and may be set as appropriate.
- the first metal separator 21 and the second metal separator 22 have a plurality of communication holes formed on both sides in the width direction.
- the fuel gas communication hole 61A, the cooling medium communication hole 62A, the oxidizing gas communication hole 63A, the cooling medium communication hole 62B, and the fuel A gas communication hole 61B is formed.
- the oxidizing gas communication hole 63B, the cooling medium communication hole 62C, the fuel gas communication hole 61C, the cooling medium communication hole 62D, and the oxidizing gas communication hole are arranged in order.
- a hole 63C is formed.
- Each communicating hole has a substantially rectangular shape composed of a linear portion and a curved portion.
- reaction gas flow paths 93 through which the reaction gas flows are formed in the first metal separator 21 and the second metal separator 22 along the longitudinal direction.
- An inlet buffer 92 and an outlet buffer 92 each having a plurality of embossments are formed on both sides of the reaction gas flow path 93 .
- the bead portions 31 are formed at multiple locations on the first metal separator 21 and the second metal separator 22 .
- the bead portion 31 is distinguished by a reference numeral, such as a bead portion 31A, a bead portion 31B, a bead portion 31C, . . . , a bead portion 31K.
- the bead portion 31A is formed so as to extend along the entire outer peripheries of the first metal separator 21 and the second metal separator 22, pass through the communication holes in a zigzag manner, and be endless.
- the bead portion 31B is formed so as to be endless along the entire outer circumference of the fuel gas communication hole 61A.
- the bead portion 31C is formed so as to be endless along the entire circumference of the outer peripheral edge of the cooling medium communication hole 62A.
- the bead portion 31D is formed so as to be endless along the entire outer periphery of the oxygen-containing gas communication hole 63A.
- the bead portion 31E is formed so as to be endless along the entire circumference of the outer peripheral edge of the cooling medium communication hole 62B.
- the bead portion 31F is formed so as to be endless along the entire outer periphery of the fuel gas communication hole 61B.
- the planar shape of each of these bead portions is formed to be one size larger along each communicating hole.
- the bead portions 31G, 31H, 31I, 31J, and 31K are formed outside the oxygen-containing gas communication hole 63B, the cooling medium communication hole 62C, the fuel gas communication hole 61C, the cooling medium communication hole 62D, and the oxygen-containing gas communication hole 63C, respectively. It is formed so as to be in an endless state over the entire periphery.
- the planar shape of each of these bead portions is formed to be one size larger along each communicating hole.
- the stacking step is a step of stacking the first metal separator 21 and the second metal separator 22 on top of each other.
- the surfaces of the first metal separator 21 and the second metal separator 22 opposite to the surface on which the bead portion 31 protrudes face each other, and the flat portions 30 and 30 are stacked together.
- the welding process is a process of welding together the first metal separator 21 and the second metal separator 22 along a preset welding route.
- a welding device welding torch
- a welded portion (weld bead) W is formed on the moving locus of the welding device.
- the welded portion W is intermittently or continuously formed inside and/or outside each bead portion 31 along each bead portion 31 .
- a weld confluence Z is a portion where the welded portions W intersect or a portion where the starting end and the terminal end of the welded portions W overlap.
- the weld confluence Z includes the case where the front and back of the first separator 3 (or the second separator 4) intersect or overlap.
- the sealing member 51 is installed on the tip surface of each bead portion 31 to complete the first separator 3 (second separator 4).
- the welded portions W are identified by reference numerals, such as welded portion W1, welded portion W2, welded portion W3, . . . .
- FIG. 4 is an enlarged plan view of the portion Q (near the fuel gas communication hole 61A) in FIG.
- An endless welded portion W1 is formed along the bead portion 31A on the outside of the bead portion 31A. Further, an endless welded portion W12 is formed along the outer peripheral edge of the fuel gas communication hole 61A (inside the bead portion 31A).
- a plurality of ribs 81 are formed on the bead portion 31B.
- the ribs 81 are formed orthogonal to the bead portions 31B.
- the rib 81 is formed so as to protrude from the flat portion 30 in the same manner as the bead portion 31B.
- the height dimension of the rib 81 is the same as or smaller than the bead portion 31B.
- the ribs 81 are provided as channels for circulating reaction gases and coolants.
- a weld junction Z1 is formed in the vicinity of the rib 81 on the weld W12.
- An endless welded portion W13 is formed along the bead portion 31C on the outside of the bead portion 31C.
- FIG. 5 is an enlarged plan view of the R portion (near the oxidant gas communication hole 63C) in FIG.
- An endless welded portion W21 is formed along the bead portion 31K on the outside of the bead portion 31K.
- a plurality of embossments 91 are formed on both sides of the weld W21.
- the embossment 91 is a portion that protrudes from the flat portion 30 .
- the embossments 91 are provided to diffuse the reaction gas.
- a weld junction Z2 is formed in the vicinity of the embossment 91 on the weld W21.
- a weld confluence Z3 is formed in the vicinity of the curved portion of the bead portion 31K.
- An endless welded portion W1 is formed along the bead portion 31A on the outside of the bead portion 31A.
- An endless welded portion W20 is formed along the bead portion 31J outside the bead portion 31J.
- each bead portion 31 has a complicated shape including a linear portion exhibiting a straight shape and a curved portion exhibiting a curved shape in the first metal separator 21 and the second metal separator 22, the rigidity is high or low. has parts.
- thick solid line circles indicate portions that become low linear pressure portions S (low linear pressure portions S1 and S2).
- the low linear pressure portion S is a portion where the linear pressure is smaller than the linear pressure required for sealing (the desired bead reaction force of the bead portion 31).
- the bead reaction force of the bead portion 31 is reduced when the bead height is reduced or the rigidity of the bead portion 31 is low.
- a weld confluence Z is formed where the welded portions W join together. Since the heat input at the welding junction Z becomes excessive during welding, a force is generated that pulls the adjacent bead portion 31 in the plane direction, and the height of the bead portion 31 is lowered and the sealing performance may be deteriorated.
- three weld confluences Z are formed in this embodiment (weld confluences Z1 to Z3).
- the weld confluence Z is unavoidably generated because it is necessary to overlap the start and end of the welded portion (weld bead) W or cross the welded portion W during the welding process.
- the weld confluence Z is formed at a position distant from the low linear pressure portion S if possible in terms of the welding process. Furthermore, if possible in terms of the welding process, it is more preferable to form the weld confluence Z at a position that will become the high-rigidity portion U or at a position away from the bead portion 31 .
- the ⁇ mark indicated by symbol V1 indicates the "previous weld confluence".
- the conventional weld junction V1 is marked at a position close to the low linear pressure portion S1. Therefore, if the previous welding confluence V1 remains at this position, the line pressure of the bead portion 31B in the vicinity of the previous welding confluence V1 may further decrease.
- the portion indicated by the dotted circle in FIG. 4 is the position of the high-rigidity portion U1. Since the high-rigidity portion U1 has a plurality of ribs 81 formed nearby, it has higher rigidity than the conventional weld confluence portion V1 on the welding route. Therefore, in the present embodiment, the welding confluence Z1 is formed at a position that becomes the high-rigidity portion U1 instead of the position of the conventional welding confluence V1.
- the position indicated by the high-rigidity portion U1 is farther from the bead portion 31B (the distance from the bead portion 31B to the welding junction Z1 is longer than the distance from the bead portion 31B to the welding junction V1 in the past). is longer), it is possible to reduce the influence of thermal contraction on the bead portion 31B when welding the weld junction Z1.
- the position of the high-rigidity portion U1 in this embodiment has high rigidity on the welding route and is sufficiently separated from the bead portion 31B. It is possible to suppress the decrease in sexuality.
- the conventional welding junction V2 is shown at a position close to the low linear pressure portion S2. Therefore, if the previous welding confluence V2 remains at this position, the linear pressure of the bead portion 31K in the vicinity of the previous welding confluence V2 may further decrease.
- the portion indicated by the dotted circle in FIG. 5 is the position of the highly rigid portion U2. Since the high-rigidity portion U2 has a plurality of embossments 91 formed nearby, it has higher rigidity than the conventional weld confluence portion V2 on the welding route. Therefore, in the present embodiment, the welding confluence Z2 is formed at the position of the high-rigidity portion U2 instead of the position of the conventional welding confluence V2. In other words, since the position of the high-rigidity portion U2 is a position on the welding route where the rigidity is high, it is possible to prevent the bead height of the bead portion 31A from being lowered, thereby suppressing deterioration of the sealing performance.
- the position indicated by the high-rigidity portion U2 is far from the bead portion 31K (the distance from the bead portion 31K to the welding junction Z2 is longer than the distance from the bead portion 31K to the welding junction V2 in the past). is longer), the influence of thermal contraction on the bead portion 31K can be reduced during welding of the weld junction Z2. That is, the position of the high-rigidity portion U2 has high rigidity on the welding route and is sufficiently separated from the bead portion 31K, so that the bead height of the bead portion 31K is prevented from being lowered, and the deterioration of sealing performance is prevented. can be suppressed.
- the welded junction Z3 is formed in the high-rigidity portion U3.
- the high-rigidity portion U3 is located near the curved portion of the bead portion 31K on the welding route, and thus has high rigidity. As a result, it is possible to prevent the height of the bead portion 31K from being lowered, so that it is possible to prevent deterioration of the sealing performance.
- the curved portion of the bead portion 31 generally has higher rigidity than the straight portion. Further, the curved portion of the bead portion 31 includes, for example, a portion where the shape of the bead portion 31 has a wave shape in plan view.
- the weld confluence Z was set at the position of the high-rigidity portion U and at a position sufficiently distant from the bead portion 31.
- the weld junction Z may be formed at a position sufficiently distant from the bead portion 31 .
- the welding junction Z may be set near the rib when the rib and the bead portion 31 do not communicate.
- the vicinity of the curved portion of the bead portion 31, the vicinity of the rib, and the vicinity of the embossment on the welding route were exemplified as the high-rigidity portion U. If the position is high, the position may be set as the high-rigidity portion U.
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Abstract
Description
また、前記第1金属セパレータ及び前記第2金属セパレータは、前記ビード部に連結するリブを備え、前記溶接ルート上において、前記リブに沿う位置に形成された前記高剛性部に前記溶接合流部を形成することが好ましい。
燃料電池スタックは、図2に示す複数個の燃料電池セル1を積層させ、燃料電池セル1の積層方向に所定の圧縮荷重を付与したものである。図2では、所定の圧縮荷重を付与して締結した状態の燃料電池セル1を描画している。
2 電解質膜・電極構造体
3 第1セパレータ(セパレータ)
4 第2セパレータ(セパレータ)
11 電解質膜(フィルム)
21 第1金属セパレータ
22 第2金属セパレータ
81 リブ
91 エンボス
S 低線圧部
U 高剛性部
W 溶接部
Z 溶接合流部
Claims (5)
- 平坦部及び前記平坦部から突出するビード部をそれぞれ備えた第1金属セパレータと第2金属セパレータとを重ね合わせる重ね合わせ工程と、
重ね合された前記平坦部同士を前記ビード部に沿って溶接する溶接工程と、を含み、
前記溶接工程では、溶接部同士が合流する溶接合流部を、溶接ルート上において剛性の高い高剛性部となる位置、及び/又は、前記ビード部から離れた位置に形成することを特徴とする燃料電池用セパレータの製造方法。 - 前記第1金属セパレータ及び前記第2金属セパレータの前記ビード部は、直線状となる直線部と、曲線状となる曲線部とを備え、
前記溶接ルート上において、前記ビード部の曲線部に沿う位置に形成された前記高剛性部に前記溶接合流部を形成することを特徴とする請求項1に記載の燃料電池用セパレータの製造方法。 - 前記第1金属セパレータ及び前記第2金属セパレータは、前記ビード部に連結するリブを備え、
前記溶接ルート上において、前記リブに沿う位置に形成された前記高剛性部に前記溶接合流部を形成することを特徴とする請求項1に記載の燃料電池用セパレータの製造方法。 - 前記第1金属セパレータ及び前記第2金属セパレータはエンボスを備え、
前記溶接ルート上において、前記エンボスに沿う位置に形成された前記高剛性部に前記溶接合流部を形成することを特徴とする請求項1に記載の燃料電池用セパレータの製造方法。 - 平坦部及び前記平坦部から突出するビード部をそれぞれ備えた第1金属セパレータ及び第2金属セパレータを溶接により接合された燃料電池用セパレータであって、
溶接によって形成された溶接部同士が合流する溶接合流部が、溶接ルート上において剛性の高い高剛性部となる位置、及び/又は、前記ビード部から離れた位置に形成されていることを特徴とする燃料電池用セパレータ。
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JP2014194877A (ja) * | 2013-03-28 | 2014-10-09 | Ngk Spark Plug Co Ltd | 燃料電池関連部品及びその製造方法 |
JP2014194876A (ja) * | 2013-03-28 | 2014-10-09 | Ngk Spark Plug Co Ltd | 燃料電池関連部品の製造方法及び燃料電池関連部品、溶接治具装置 |
JP2016015310A (ja) * | 2014-06-11 | 2016-01-28 | 日産自動車株式会社 | レーザー溶接装置、およびレーザー溶接方法 |
JP6368807B2 (ja) | 2016-02-02 | 2018-08-01 | 本田技研工業株式会社 | 燃料電池スタックの製造方法及び燃料電池用金属セパレータの製造方法 |
JP2019096382A (ja) * | 2017-11-17 | 2019-06-20 | 本田技研工業株式会社 | 燃料電池用金属セパレータ及び燃料電池 |
JP2021051857A (ja) * | 2019-09-24 | 2021-04-01 | トヨタ自動車株式会社 | 燃料電池の製造方法 |
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JP2014194877A (ja) * | 2013-03-28 | 2014-10-09 | Ngk Spark Plug Co Ltd | 燃料電池関連部品及びその製造方法 |
JP2014194876A (ja) * | 2013-03-28 | 2014-10-09 | Ngk Spark Plug Co Ltd | 燃料電池関連部品の製造方法及び燃料電池関連部品、溶接治具装置 |
JP2016015310A (ja) * | 2014-06-11 | 2016-01-28 | 日産自動車株式会社 | レーザー溶接装置、およびレーザー溶接方法 |
JP6368807B2 (ja) | 2016-02-02 | 2018-08-01 | 本田技研工業株式会社 | 燃料電池スタックの製造方法及び燃料電池用金属セパレータの製造方法 |
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