WO2008023755A1 - Bipolar plate member, bipolar plate layered body, cell structure, and solid polymer fuel cell - Google Patents

Abstract

[PROBLEMS] To provide a solid polymer fuel cell in which coolant can rapidly flow without causing a leak. [MEANS FOR SOLVING PROBLEMS] A bipolar plate member (1) of a solid polymer fuel cell using a membrane electrode assembly includes: through holes (2, 3) for introducing oxidant gas, fuel gas, and coolant into respective passes; a pass groove (4) for flow of the oxidant gas or the fuel gas; and a pass groove (5) for flow of the coolant. A plastic film sheet-shaped body (7) is bonded to at least a second surface of the bipolar plate member (1) via an adhesive layer. A through hole (3) for flow of at least the coolant in the pass is formed in the plastic film sheet-shaped body (7).

Description

 Specification

 Nopolar plate members, bipolar plate laminates, cell structures, and polymer electrolyte fuel cells

 Technical field

 The present invention relates to a polymer electrolyte fuel cell, and particularly relates to a member for a bipolar plate (also called a separator), a bipolar plate laminate, a cell structure, and a fuel cell.

 Background art

 [0002] A polymer electrolyte fuel cell is configured by sandwiching a membrane electrode assembly (MEA) between bipolar plates. The membrane electrode assembly is a laminate in which an anode electrode and a force sword side electrode are laminated on both sides of a polymer electrolyte membrane, and the bipolar plate has a gas flow path for flowing an oxidant gas or a fuel gas. It is a thing. One unit of such a configuration is called a cell. There is also the power of single-cell fuel cells. Practically, a fuel cell (fuel cell stack) in which many single cells are stacked is used. On the other hand, refrigerant such as cooling water is introduced or discharged between the cells in order to suppress heat generation. Hereinafter, these are collectively referred to as “distribution”.

 [0003] Therefore, in order for the fuel cell stack to operate normally, it is important that the oxidant gas, the fuel gas, and the refrigerant flow quickly without leaking. For example, Patent Documents 1 to 3 make various proposals regarding the seal structure. Patent Document 4 proposes a configuration for making the flow rate of the reaction gas uniform in the electrode.

 [0004] Patent Document 6 discloses a polymer electrolyte fuel cell sealing material comprising a styrene block polymerization elastomer and at least one tackifier selected from a terpene resin and an alicyclic resin. It is disclosed.

 [0005] Patent Document 1: JP 2000-156234 A

 Patent Document 2: JP-A-2005-129343

 Patent Document 3: Japanese Translation of Special Publication 2005-503643

Patent Document 4: WO 2006/062242 A1 Patent Document 5: Japanese Patent Laid-Open No. 2003-193206

 Patent Document 6: Japanese Patent Laid-Open No. 2006-236671

 Disclosure of the invention

 Problems to be solved by the invention

 [0006] For example, rubber O-rings, gaskets, and one-stroke linear or belt-like seals are used for seal structures such as oxidant gas, fuel gas, and refrigerant flow paths. This is because the sheet-shaped (planar) sealing material has a large contact area with each other, so that the load load per unit area is small under the constant tightening load condition, and the tightening mechanism has a large force. The reason is that it has been considered to be. In addition, since sheet-like (planar) seals are difficult to contact uniformly and continuously, insufficient force contact occurs when oxidant gas and fuel gas flow at high pressure. As a result, it has been considered that position misalignment is likely to occur! /.

 However, when the sealing material is formed into a sheet shape, not only the fitting groove for fitting the rubber O-ring, which is necessary for improving the sealing performance, becomes unnecessary, but also as a constituent member utilizing the thickness of the sealing material itself. Can be used actively as a strength member utilizing the strength of the material, and as a structural member for providing a channel groove. The problem of misalignment can be solved by providing the sealing material with adhesive performance. In particular, providing a channel groove with a sealing material can greatly increase the degree of freedom in channel design. This is an advantage that is difficult to obtain in the case of a metal foil having a thin substrate thickness for a member for a bipolar plate or a thin carbon bipolar plate formed by injection molding.

 [0008] In the present invention, the sealing material is composed of a plastic film planar molded body laminated via an adhesive layer, and a groove for forming a flow path is provided in the plastic film planar molded body. , A polymer electrolyte fuel cell that can quickly flow without leaking oxidant gas, fuel gas, and refrigerant, and a bipolar plate member, a bipolar plate laminate, and a cell structure that are components thereof The purpose is to provide

 Means for solving the problem

The present invention provides a bipolar plate member shown in the following (1) and a bipolar plate shown in the following (2). The gist of the paper is a laminate of laminated plates, a cell structure shown in (3) below, and a fuel cell shown in (4) below.

 [0010] (1) A member for a bipolar plate of a polymer electrolyte fuel cell, comprising a through-hole for flowing an oxidant gas, a fuel gas and a refrigerant into each flow path, and an oxidant gas or A first surface having a first flow path groove for flowing the fuel gas and a second flow path groove for flowing the refrigerant, and having the first flow path groove formed thereon, and Of the second surface on which the second channel groove is formed, a plastic film surface molded body is attached to at least the second surface via an adhesive layer, and this plastic film surface molding is performed. A bipolar plate member, wherein the body is formed with a through-hole for flowing at least a refrigerant in the flow path.

 [0011] The base of the bipolar plate member is preferably made of stainless steel, high alloy steel, titanium, titanium alloy, aluminum, aluminum alloy, or a clad thereof. Stainless steel has conductive M C, M C, M C and MC type carbides on the surface.

 23 6 4 2

 One or more of the metal-based metal compounds and MB type boride-based metal compounds are exposed.

 2

 It is desirable to be stainless steel. However, M is a metal element that forms carbide or boride.

 [0012] The base of the bipolar plate member has a maximum thickness of 0.20 mm or less, and the through hole, the first flow path groove, and the second flow path groove are press-molded. , Punching and injection molding process! /, Displacement force, one or more formed! Further, it is desirable that the substrate of the above-mentioned plastic film planar molded body is polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytetrafluoroethylene (PTF) or polyimide.

[0013] A plastic film planar molded body is formed by laminating a plurality of plastic films in which a through hole or a through hole and one or more of a first flow path groove and a second flow path groove are formed. Through-holes formed in at least one plastic film, one or more shape forces S of the first flow path groove and the second flow path groove, formed in another plastic film It is desirable that the shape of each of the through hole, the first channel groove, and the second channel groove is different. [0014] It is more desirable to provide a channel groove having a plurality of outlets between the through hole formed in the plastic film planar molded body and the second channel groove. The shape of the channel groove is, for example, one in which the number of inlet holes opened in the through hole is smaller than the number of outlet holes opened in the second channel groove, that is, the channel groove is branched. Or the same number of inlet holes and outlet holes. Further, it is desirable that the width of the channel groove formed by the plastic film planar molded body is 1.20 mm or less.

 [0015] The first surface is provided with a noble metal plating such as gold or a gold alloy having an average thickness of lOOnm or less and an area coverage of 10 to 90%! Desire les.

 [0016] At least one of the first surface and the second surface is provided with island-like dispersed noble metal plating, and island-like dispersion in a portion of the matrix surface other than the portion occupied by the conductive metal compound. It is desirable that the thickness of the noble metal plating is not more than lOOnm in terms of the average thickness defined by the following formula.

Average thickness (nm) = adhesion amount of precious metal per unit area (gm ² ) X 10 ⁷ / plating precious metal specific gravity (gm ³ )

 [0017] The surface coverage A of the conductive metal compound and the surface coverage B of the island-like dispersed noble metal plating should satisfy the following relational expression. In addition, it is desirable that the island-shaped dispersed precious metal plating is plated in a bath of 0.1≤pH≤7.1! /.

 5≤A (%) ≤40

 5≤B (%) ≤ 90 -0.7A (%)

 A (%) + B (%) ≤100%

[0018] The adhesive layer preferably contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin.

[0019] (2) A refrigerant flow path is formed by using the two members for a bipolar plate described in (1) above and bringing the second surfaces into contact with each other via an adhesive layer. Bipolar plate laminate.

[0020] It is desirable that the two bipolar plates have the same shape. The adhesive layer preferably contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin. [0021] (3) A cell structure of a polymer electrolyte fuel cell, characterized in that the bipolar plate laminate according to (2) above and the membrane electrode assembly are laminated via an adhesive layer. A cell structure.

 [0022] The cell structure is preferably a laminate of a plurality of the cell structures of (3) above. The adhesive layer preferably contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin.

 [0023] (4) The bipolar plate member according to (1), the bipolar plate laminate according to (2), and the cell structure according to (3). This is a polymer electrolyte fuel cell.

 [0024] The membrane electrode assembly is a membrane-electrode integrated structure also called MEA (Membrane Electrode Assembly), and is usually made of carbon fine powder on both sides of a fluorine-based or aromatic polymer membrane. After coating a catalyst layer carrying a platinum-based catalyst, carbon paper or carbon cloth is laminated. A membrane electrode assembly in which a gasket is integrated has also been commercialized. From the gist of the present invention, it is preferable to apply a gasket-integrated membrane electrode assembly.

 The invention's effect

 [0025] According to the present invention, it is possible to provide a polymer electrolyte fuel cell capable of promptly flowing without leaking oxidant gas, fuel gas and refrigerant. Further, according to the present invention, it is possible to reduce the weight and size of the fuel cell while ensuring mass productivity.

Yes

 Brief Description of Drawings

 FIG. 1 is a schematic view showing an example of a bipolar plate member according to the present invention.

 (First side) and (b) show the back side (second side)! /, Respectively.

 FIG. 2 is a schematic diagram showing an example of a joined state between a base and a plastic film surface molded body.

FIG. 3 is a schematic view showing another example of the bipolar plate member of the present invention.

FIG. 4 is a schematic view showing another example of the bipolar plate member of the present invention. [Fig. 5] Schematic representation of the shape of the through hole and the second channel groove, (a) is a top view, (b) is an AA view of (a), (c) is ( It is BB sectional drawing of a).

 FIG. 6 is a diagram schematically showing another example of the shape of the through hole and the second channel groove, where (a) is a top view, (b) is an AA view of (a), ( c) is a BB cross-sectional view of (a).

 FIG. 7 is a schematic view showing an example of a method for producing a member for a bipolar plate according to the present invention.

 FIG. 8 is a schematic view showing an example of a method for producing a member for a bipolar plate according to the present invention.

 FIG. 9 is a schematic view showing an example of a bipolar plate laminate according to the present invention.

 FIG. 10 is a schematic view showing another example of a bipolar plate laminate according to the present invention.

 Explanation of symbols

 [0027] 1, 1-1, 1-2, 1-3, 1-4 Bipolar plate member,

 2. Gas through hole

 3. Refrigerant through hole,

 4. First channel groove,

 5.Second channel groove

 6. Substrate,

 7. 7-1, 7-2, 7-5, 7-6.

 7-3.Through hole,

 7-4. Part of the second channel groove (auxiliary channel groove),

 8. Laminate,

 9. Support

 BEST MODE FOR CARRYING OUT THE INVENTION

The present invention relates to a polymer electrolyte fuel cell using a membrane electrode assembly, and a member for a bipolar plate, a bipolar plate laminate, and a cell structure as its constituent members.

 [0029] (1) Bipolar plate members

FIG. 1 is a schematic view showing an example of a bipolar plate member according to the present invention, where (a) shows the front surface (first surface) and (b) shows the back surface (second surface), respectively. RU As shown in FIG. 1, the bipolar plate member 1 according to the present invention contains an oxidant gas or a fuel gas in the flow path. It has a through hole 2 for flowing and a through hole 3 for flowing the refrigerant into the flow path. As shown in FIG. 1 (a), the surface (first surface) is provided with a first flow path groove 4 for flowing an oxidant gas or a fuel gas. ), A second flow path groove 5 for allowing the refrigerant to flow is formed on the back surface (second surface). At least on the second surface, a plastic film planar molded body 7 is attached to the base 6.

 FIG. 2 is a schematic diagram showing an example of a joined state of the base body and the plastic film surface molded body. In the example shown in FIG. 2, the plastic film surface molded body 7-1 and the plastic film surface molded body 7-2 are bonded to the second surface of the bipolar plate member 1 on the substrate 6. Shells are seized through layers (not shown)! /

 [0031] Here, an adhesive layer is preliminarily applied to one or both surfaces of the plastic film sheet-like molded body. For example, the adhesive layer is applied to the surface of the plastic film planar molded body 7-2 that contacts the base 6 and both surfaces of the plastic film planar molded body 7-1. A member for a bipolar plate can be formed by crimping the planar molded bodies 7-1 and 7-2.

 [0032] Through-holes 7-3 are formed in the plastic film planar molded bodies 7-1 and 7-2 for circulating the refrigerant into the flow path. Further, the plastic film planar molded body 7-1 is formed with a through-hole for circulating at least the refrigerant in the flow path. Further, at least a part 7-4 of the second channel groove for allowing the refrigerant to flow is formed as necessary. By having these configurations, a bipolar plate member that ensures both fluidity and sealability is obtained.

 [0033] The plastic film planar molded body 7-2 may be formed with a part of a channel groove similar to the plastic film planar molded body 7-1. However, since the plastic film sheet-like molded body 7-2 that comes into contact with the substrate has an effect of preventing the corrosion of the substrate, it is preferable that no channel groove is formed. The plastic film planar molded body 7-1 serves as a seal for the cooling medium and constitutes a flow path for the refrigerant.

[0034] The total thickness of the plastic film planar molded body 7-1 and the plastic film planar molded body 2-2 is substantially the same as the height of the flow path formed in the substrate 6, It also plays a role as a service. In the example shown in FIG. 2, a case where a part of the second channel groove is configured is shown. However, the second groove for the second flow path may be entirely constituted by the plastic film planar molded bodies 7-1 and 7-2. This will be described later.

[0035] The plastic film planar molded body may be a single-layer plastic film, or may be a laminate of a plurality of plastic films.

FIG. 3 and FIG. 4 are schematic views showing another example of the bipolar plate member of the present invention. In the example shown in FIG. 3, the plastic film surface molded body 7-5 and the plastic film surface molded body 7-6 are attached to the second surface of the bipolar plate member 1 on the substrate 6. Shells are occupied through layers (not shown). This is the same as the case shown in FIG.

 [0037] The plastic film planar molded bodies 7-5 and 7-6 are formed with through holes 7-3 for circulating the refrigerant into the flow path. The plastic film planar molded body 7-5 has at least a through hole for flowing the refrigerant in the flow path, and at least a second for flowing the refrigerant as required. Part of the channel groove 7-4 is formed. By having these configurations, a bipolar plate member that ensures both fluidity and sealability is obtained.

 In addition, the example shown in FIG. 4 is a case where a planar molded body made of a plastic film composed of three layers of plastic films 7-5, 7_6, 7_7 is used. As shown in FIG. 4, a through-hole 7-3 is formed in the plastic film sheet-like molded bodies 7-5, 7-6, 7-7 for circulating the refrigerant in the flow path. In addition, the plastic film planar molded bodies 7-5 and 7-6 are formed with a part of a channel groove (hereinafter, also referred to as “auxiliary channel groove”) 7-4. The direction of the groove is divided into two. That is, in this example, the shape force S of the second channel groove of one plastic film is different from the shape of the second channel groove formed in another plastic film.

5 and 6 are diagrams schematically showing the shapes of the through hole and the second channel groove, where (a) is a top view and (b) is an AA view of (a). (C) is a BB sectional view of (a). As shown in FIG. 5, the auxiliary flow path groove 7-4 connected to the through hole 7-3 has, for example, an inlet (a port opened to the through hole) having a single force. In the case of (the opening opened to the second channel groove), one divided in two directions can be used. That is, as shown in (c), What was a single hole at the entrance is divided into two holes at the exit, as shown in (b). In this example, the shape of the channel groove between the through hole formed in the plastic film planar molded body and the second channel groove is such that the number of inlet holes opened to the through hole is the second flow rate. Less than the number of exit holes opened in the road groove!

 [0040] As shown in FIG. 6, the auxiliary channel groove 7-4 connected to the through hole 7-3 includes, for example, an inlet (a port opened to the through hole) and an outlet (second channel). It is possible to use two things that are both open to the groove for use. In this example, there are the same number of inlets and outlets.

 [0041] If such a channel groove is formed, the refrigerant and the like will flow in different directions from the auxiliary channel formed when the bipolar plates are joined together. It becomes easy to secure. In the example of FIG. 5, the force showing the case where the auxiliary flow path is divided into two hands. The number of divisions of the auxiliary flow path is not limited to two, and may be three or more. In the example of FIG. 6, a force using two auxiliary channels may be used. Three or more auxiliary channels may be used.

 In the example shown in FIG. 3, the auxiliary channel groove 7-4 is formed in a direction not parallel to the channel (the channel formed in the base 6). If such a channel groove is formed, as will be described later in FIG. 10, when the bipolar plates are joined together, the refrigerant or the like flows from the auxiliary channel in different directions. Therefore, it becomes easy to ensure fluidity.

 As described above, the fluidity of the refrigerant has been mainly described, but this configuration also contributes to the fluidity of the fuel gas. Therefore, when the first flow path groove is formed by the plastic film planar molded body, the same configuration as in FIGS. 3 to 6 may be employed. In the above examples, the shape of the through hole is the same, but the shape of the through hole may be different.

 [0044] In particular, the inner diameter of the through-hole provided in the plastic film sheet-shaped molded body is set smaller than the inner diameter of the through-hole provided in the base substrate to ensure the corrosion resistance of the through-hole of the substrate, and these are laminated. After that, the corrosion resistance of the inner surface of the through hole of the substrate can be improved by folding the periphery of the through hole of the plastic film sheet-shaped molded body into the through hole of the substrate.

[0045] The base 6 of the bipolar plate member is preferably made of stainless steel, high alloy steel, titanium, titanium alloy, aluminum, aluminum alloy, or a clad thereof. This is because by using a metal, mass production can be performed at low cost, and performance can be obtained immediately and stably. In particular, stainless steel foil and stainless clad foil are suitable. Titanium and titanium alloys are preferred because they are lightweight and have particularly excellent corrosion resistance. Aluminum and aluminum alloys are preferred because they can be reduced in weight.

 [0046] If these materials are clad, the advantages of each material can be utilized. For example, while ensuring excellent corrosion resistance as titanium, the core can be made of inexpensive aluminum, so that various performances can be secured while achieving weight reduction.

 [0047] The above stainless steel has a conductive MC type surface as described in Patent Document 5, M

 23 6 4

C-type, MC-type and MC-type carbide metal compounds and MB-type boride metals

twenty two

 Desirably, the stainless steel is one or more of the compounds exposed. As used herein, “exposure” refers to a state in which at least part of the surface protrudes from the surface so as to break through the passive film of stainless steel constituting the bipolar plate.

[0048] M is a metal element that forms a carbide or boride. For example, M is one or more of Cr, Fe, Mo, and W.

 [0049] Generally, metal compounds such as carbides present in stainless steel are inclusions that lower the corrosion resistance, and are considered undesirable. In the present invention, a carbide-based or boride-based compound, which has been conventionally excluded as an inclusion, is actively used to reduce the contact electrical resistance that is increased by the passive film. ".

 [0050] There is no particular limitation on the method of bringing the carbide-based metal compound or boride-based metal compound into a state of protruding from the bipolar plate surface. The most practical method is a method in which a component (C, B, Cr, Mo, W, etc.) that forms the above compound is contained in stainless steel, and the compound is precipitated in the steps of melting and heat treating stainless steel. . If carbide or boride is exposed on the surface of stainless steel, the surface contact resistance can be said to be sufficient for application as a polymer electrolyte fuel cell bipolar plate.

 [0051] If the carbide or boride is inside the stainless steel and the surface has already been covered with a passive film, the base material of the surface layer portion can be removed together with the passive film by appropriate means such as pickling. It may be removed and the internal carbide or boride is exposed on the surface.

[0052] In addition, there is a method in which carbide or boride particles are struck against the surface of the bipolar plate by means such as shot-peening and penetrated through the passive film. Also, It is also possible to infiltrate the above-mentioned elements into the surface layer portion of the bipolar plate and generate carbide or boride particles only in the surface layer portion by an appropriate heat treatment.

 [0053] The base of the bipolar plate member has a maximum thickness of 0.20 mm or less, and the through hole, the first flow path groove, and the second flow path groove are press-molded. It should be formed by one or more types of punching and injection molding processes. This allows mass production of lighter and more compact fuel cell stacks. If the substrate of the bipolar plate member is thick, the heat capacity increases, and the low temperature startability required for fuel cell characteristics and the temperature followability at the start and stop tend to deteriorate. The substrate of the bipolar plate member is preferably thin as long as the structure, structure and strength of the fuel cell stack can be maintained. A desirable upper limit for the thickness of the maximum wall thickness is 0.12 mm.

 [0054] The plastic film planar molded body is required to have a small elution of the resin component in the polymer electrolyte fuel cell, a small decrease in creep strength even when used for a long time, and a small film thickness change. . In addition, it must be mass-produced and readily available. Furthermore, since it is used in large quantities, it is necessary to consider recycling. Accordingly, examples of the plastic film planar molded body include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytetrafluoroethylene (PTF), and polyimide. . In consideration of mass production, it is desirable that it can be obtained in a coiled state, but if it is thick, it may be a sheet. Further, metal fine powder, fine resin powder imparted with conductivity, carbon particles, and the like may be finely dispersed in these plastic film sheet-like molded bodies.

 [0055] The first surface may be provided with a noble metal plating in order to reduce surface contact resistance and suppress corrosion of the base body, which is a member for a bipolar plate. At this time, the noble metal plating such as gold or gold alloy should have an average thickness of lOOnm or less. In particular, 50 nm or less is desirable.

[0056] The bipolar plate member has a large area that requires plating, so that the cost of fitting is excessive. In addition, it is not suitable for mass production to plate up to a state where there is no plating defect. However, as the average thickness of the plating decreases, the number of cling defects increases. In other words, the substrate corrosion of the bipolar plate member from the dent defect due to galvanic corrosion increases. , Which tends to lead to penetration corrosion.

[0057] From the above, the present inventors are extremely effective to apply plating with an average thickness of lOOnm or less as a measure for effectively utilizing noble metal plating that can provide a great effect in improving surface contact resistance. I found out. The method for calculating the average thickness will be described later.

 [0058] The following three points must be met for a noble metal plating having an average thickness of lOOnm or less.

[0059] (1) Plated precious metal force is observed in a surface with a scanning electron microscope.

 (2) The area coverage by the noble metal particles, which are evaluated as the surface occupancy rate as measured by observation directly above the surface with a scanning electron microscope, is 10 to 90%, and the cyclic voltane is an electrochemical technique. The area coverage quantitatively evaluated by the metric (CV method) must be 10-90%

 (3) Cello tape (Registered trademark) In adhesion evaluation by peel test, plated noble metal particles should not fall off

 [0060] As the surface occupancy of the noble metal particles decreases! /, The mixed potential consisting of the surface potential of the noble metal that causes galvanic corrosion and the substrate surface potential of the bipolar plate member approaches the substrate surface potential. The degree of galvanic corrosion due to adhesion is minimal. It is also effective to reduce the degree of galvanic corrosion by finely and evenly dispersing in a granular and macroscopic manner.

 [0061] The area coverage of the noble metal plating is preferably 10 to 90%. If the area coverage is less than 10%, the effect of reducing the surface contact resistance, which is the purpose of precious metal plating, becomes unstable, and the improvement effect becomes difficult to be recognized. On the other hand, if the area coverage exceeds 90%, the exposed base of the bipolar plate member may appear to be a plating defect, and galvanic corrosion may not be avoided.

[0062] From the viewpoint of corrosion resistance, gold is most preferable as the material for the noble metal plating. This is because, among solid polymer fuel cells, gold is the only corrosion-resistant material among the noble metals. However, as is well known, pure gold is soft and extremely expensive. To increase the hardness of the plating metal, to ensure the stability of the plating solution, or to improve the plating performance Therefore, the plating metal may contain one or more of trace amounts of Fe, In, Ni, Co, Ag, Cu, and Pd that are added to normal plating solutions.

[0063] Here, it is desirable that at least one of the first surface and the second surface has an island-like dispersed noble metal plating. At this time, the thickness force S of the island-like dispersed noble metal plating in the portion of the matrix surface other than the portion occupied by the conductive metal compound is preferably less than lOOnm in the average thickness defined by the following formula! /, .

Average thickness (nm) = adhesion amount of precious metal per unit area (gm ² ) X 10 ⁷ / plating precious metal specific gravity (gm ³ )

 [0064] This is because, when the surface thickness represented by the above formula exceeds lOOnm, there is a possibility that a problem that the corrosion resistance is likely to be manifested even when the island-like dispersion is attached.

[0065] Further, the surface coverage A of the conductive metal compound and the surface coverage B of the island-like dispersed noble metal plating should satisfy the following relational expression.

 5≤A (%) ≤40

 5 ≤B (%) ≤ 90 -0.7A (%)

 A (%) + B (%) ≤100%

[0066] If the value of A is less than 5, the surface contact resistance value may not be obtained stably! /.

 From the viewpoint of reducing contact resistance, the value of A is high! /, But better! /, But it is difficult to produce a material with an A value exceeding 40, and rolling of the material becomes difficult.

[0067] When the value of B is less than 5, it may be stably low! / And the surface contact resistance value may not be obtained! /.

 On the other hand, when the value of B exceeds 90-0.7A, the substrate surface covered with the noble metal and the galvanic corrosion of the substrate surface covered with the noble metal becomes obvious and covered with the noble metal. It is easy to make perforated corrosion from the surface of the base material.

[0068] The island-like precious metal plating should be plated in a bath with 0.1≤pH≤7.1

. If the pH is less than 0.1, corrosion of the substrate during plating may increase. On the other hand, if the pH exceeds 7.1, the non-moving body film on the surface of the base material inevitably remains on the surface during plating, and thus the adhesion of the plating may not be obtained.

[0069] It is desirable that the width of the groove for the flow path formed by the plastic film planar molded body is 1.20 mm or less. If it exceeds 1.20mm, the base material for bipolar plate This is because it becomes difficult to maintain the flatness of the substrate when the 1S plastic film sheet-like molded body is attached. If the flatness cannot be maintained in this manner, the oxidant gas, the fuel gas and the refrigerant may leak when the bipolar plate laminate, the cell structure, or the fuel cell is used. Desirable is 1.00mm or less.

 [0070] If the widths of the first flow path groove and the second flow path groove formed on the substrate of the nopolar plate member are too wide, the membrane electrode assembly may hang down in the flow path groove. is there. As a result, the cross-sectional shape of the flow path is not uniform, and the gas flow may be non-uniform. On the other hand, if it is too narrow, there is a risk of clogging with water generated in the fuel cell. Therefore, it is desirable that the lower limit of the widths of the first flow path groove and the second flow path groove formed in the base of the nopolar plate member is 0.5 mm. The upper limit is preferably 3mm.

 [0071] The adhesive layer preferably contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin or a tempen hydrocarbon resin. These are resin systems that are few as resin systems that have adhesive performance with few eluted components that do not react in the fuel cell. If necessary, other resins such as silicon resin may be included! /, But it is desirable that the content of resins other than Tatsuki Fire is low! /.

 [0072] (2) Production method of bipolar plate member

 There are no particular restrictions on the method of manufacturing the nopolar plate member. For example, it can be manufactured by the following method. Hereinafter, a method for manufacturing a bipolar plate member according to the present invention will be described with reference to FIGS.

 [0073] As shown in FIG. 2, for example, a substrate 6 produced by a press working method, etc., and plastic film planar molded bodies 7-1 and 7- produced by stamping after applying an adhesive layer, etc. 2 are prepared, and these are superposed and then pressure-bonded to produce the bipolar plate member of the present invention.

[0074] Further, as shown in FIG. 7, for example, after the plastic film planar molded body 7 is attached to the substrate 6 (see FIG. 7 (a)), these are punched by a Thomson die or the like. Then, a channel groove is formed in the laminated body 8 of the base body 6 and the plastic film sheet-like molded body 7 (see FIG. 7 (b)). Thereafter, as shown in FIG. The member for a bipolar plate of the present invention can also be manufactured by occupying the shell 9 on the support 9 in which the through hole is formed. Na The support 9 and the substrate 6 can be collectively referred to as a substrate.

 In the member for a bipolar plate manufactured by this method, the entire second flow path groove for supplying the refrigerant is constituted by the plastic film planar molded body 7. In addition, FIG. 8 shows the force when a plastic film planar molded body is affixed to one side of the substrate. Naturally, the first channel groove for gas is formed on the opposite side. It is. As a method for forming the first flow path groove, the first flow path groove is formed in the laminate 8 of the base body 6 and the plastic film sheet-like molded body 7 as in the method shown in FIG. Then, it may be affixed to the support 9. Alternatively, the base body 6 on which the first flow path groove is formed may be attached to the support body 9.

 [0076] (3) Bipolar plate laminate

 The bipolar plate can be used alone or can be used by laminating many bipolar plates. When stacking, it is beneficial for set manufacturers to reduce the number of parts as much as possible. For this reason, there is a case where a laminate of the two bipolar plate members described in (1) above (hereinafter referred to as a bipolar plate laminate) is handled as a unit.

 FIG. 9 is a schematic diagram showing an example of a bipolar plate laminate according to the present invention. As shown in FIG. 9, the bipolar plate laminate according to the present invention is a refrigerant by bringing the second surfaces of the two bipolar plate members 1-1 and 1-2 into contact with each other via an adhesive layer. It is possible to produce and produce a flow path. Desirably, the adhesive layer also contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin.

 It is desirable that the two bipolar plate members 1-1 and 1-2 have the same shape as shown in FIG. With such a configuration, the manufacturing cost of the nopolar plate member can be reduced, and the labor for assembly can be drastically reduced.

[0079] In the bipolar plate laminate shown in Fig. 9, an oxidant gas and a fuel gas are allowed to flow on the upper surface and the lower surface, respectively, and the refrigerant is contained in the intermediate layer (the layer of the plastic film surface-molded product). Will be washed away. Specifically, a membrane electrode assembly (not shown) is attached to the upper surface of the bipolar plate laminate, and the bipolar plate is further applied to the upper surface. One fuel cell is completed by sticking the laminate 1 or the bipolar plate member 1 shown in FIG.

 FIG. 10 is a schematic diagram showing another example of a bipolar plate laminate according to the present invention.

 As shown in FIG. 10, the bipolar plate laminate according to the present invention, for example, makes the second surfaces of the two bipolar plate members 1-3 and 1-4 contact each other via an adhesive layer. Therefore, the manufacturing force S can be formed by forming the refrigerant flow path. At this time, the flow path of the refrigerant is divided into two in the second flow path as shown in FIG. For this reason, since the refrigerant and the like flow from the auxiliary flow path in different directions, it is advantageous for ensuring fluidity.

 In the example shown in FIG. 10, as in the example shown in FIG. 9, the two bipolar plate members 1-3 and 1-4 have the same shape. The manufacturing cost can be reduced and the labor for assembly is drastically reduced.

 [0082] (4) Cell structure

 For the same reason as described in (3) above, a cell structure in which a membrane electrode assembly is laminated on the bipolar plate laminate 10 via an adhesive layer may be prepared. This dramatically improves work efficiency in the set maker. As the cell structure for a fuel cell constituted by a plurality of cells, the cell structure is preferably a laminate of a plurality of the cell structures. The adhesive layer preferably contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin.

 [0083] (5) Solid polymer fuel cell! /

 The polymer electrolyte fuel cell according to the present invention can be configured with a force S by appropriately combining at least one of the above-mentioned bipolar plate members, bipolar plate laminates, and cell structures.

[0084] For example, in the case of a single-cell solid polymer fuel cell, three bipolar plate members and one gasket-integrated membrane electrode assembly are prepared, and the second bipolar plate member 2 is prepared. These surfaces are bonded together to form a refrigerant flow path, and the membrane electrode assembly is sandwiched between the first surface and the first surface of the other bipolar plate member. Thus, a flow path for fuel gas and a flow path for oxidant gas are formed by bonding together. Use force S.

 [0085] Similarly, if one or more of the above-mentioned bipolar plate members, bipolar plate laminates, and cell structures are appropriately combined, it is possible to manufacture a multi-cell solid polymer fuel cell with the force S. .

 Example 1

 [0086] A member for a bipolar plate was manufactured by the following method, and a fuel battery cell was constructed to evaluate gas seal performance, fastening performance, and battery performance.

 [0087] First, each material coil or sheet having a thickness of 30 to 200 m and a plate width of 130 mm shown in Table 1 was prepared, and press molding or Thomson using an Amada single-acting crank press with a maximum load of 80 tons. A base plate for a bipolar plate member having an effective flow path area of 80 mm X 60 mm and an external dimension of 100 mm X 100 mm was manufactured by punching using a punching die. The channel height of the press-formed product was 0.360 mm ± 0.010 mm. The channel width of the substrate was 1.6 mm, and the channel width of the plastic film surface-shaped molded body was 1.0 mm. The substrate was washed as necessary to remove the lubricating oil, alkali degreased, and pickled to adjust the surface.

 [0088] In the punching method, after a plastic film having an adhesive layer is attached to the test material shown in Table 1, a molded body that is punched out by Thomson die and is in contact with the membrane electrode assembly is manufactured. A flow path was formed by bonding onto a carbon support containing a metal or injection-molded resin.

[0089] [Table 1]

For the substrate molded by the press molding method, various plastic film planar molded products shown in Table 2 are stacked on the back surface (second surface) with respect to the gas flow path surface (first surface). A gasket was constructed. The substrate molded by the press molding method is not cooled on the second surface. A protrusion is formed along the second channel groove used for the flow of the medium. Therefore, the total thickness of the plastic film sheet-like molded body was adjusted so that the height of the protrusions was ± 30 ^ m. As the adhesive layer, Tatsuki Fire was used.

 [Table 2]

 [0092] Two bipolar plate members prepared as described above were prepared, and the gasket-integrated membrane electrode assembly was inserted between the first surfaces, and the copper plated on both sides thereof. A current collector plate with a thickness of 5 mm was provided. A current collector plate was bonded to the second surface of the bipolar plate member via a plastic film surface-shaped body. Furthermore, two plate members made of aluminum and having a thickness of 40 mm were arranged from both sides of the current collector plate and fastened with 12 bolts to constitute a fuel cell single cell. By the same method, fuel cells of 3 cell stack, 5 cell stack and 10 cell stack were constructed.

 [0093] The following performance of the fuel cell produced in this way was investigated.

 <Uniform surface pressure>

To evaluate the fastening performance of the fuel cell, insert a pressure sensitive film (Fujifilm prescale) together with the membrane electrode assembly into the cell, fasten the cell, and then disassemble the cell. It was confirmed whether the surface pressure distribution inside the cell was uniform from the color of the body and pressure-sensitive film. The results are also shown in Table 3. In Table 3, 10 is good, 8 is slightly bad, but is at a practically acceptable level, and 5 and below means bad and difficult to apply. In the example, there was no evaluation of 5 or less.

 [0094] <Sealability>

 Hydrogen gas that is easy to check for leaks is introduced from the fuel gas or oxidant gas gas inlet of the fuel cell, and the gas outlet is sealed to maintain the hydrogen gas pressure inside the cell at O. lMpa (gauge pressure). Then, hydrogen gas leakage outside the cell was confirmed by a gas detector. The results are shown in Table 3. In Table 3, 10 is good, 8 is slightly bad and hydrogen gas leaks in part, but power generation is possible, and 5 and below means bad and difficult to apply. In the examples, there was no evaluation of 5 or less.

 [0095] <Battery output>

Fuel gas and oxidant gas were circulated through the single cell fuel cell, and the fuel cell was operated with the electronic load connected, and the output was measured. The results are also shown in Table 3. In both examples, the current value was constant at 0.5 A · m ² . Indicates the output voltage (V) at the beginning of operation and the output voltage (V) after 100 hours of operation. The higher the output voltage, the better the performance, and the lower the output drop! / The battery performance is better!

 [0096] Table 3 shows the conditions of the manufactured bipolar plate member and the results of its accuracy test.

 In addition, each material except alloys Νο · 4, 5, 6, and 7 was subjected to gold plating with an average thickness of 40 nm to reduce surface contact resistance.

[0097] [Table 3]

Table 3

Surface pressure uniformity: 1 0 Good, 8 Slightly poor, but acceptable level, 5 or less, poor, difficult to apply Gas seal property: 10 Good, 8 Slightly defective, leakable but can generate electricity, 5 or less Bad, difficult to apply Cell battery output: Cell voltage (V) 100 hours after start of operation, higher voltage, less output drop is better

Example 2

 [0099] Among the materials shown in Table 1, materials subjected to the staking treatment using Alloys 1, 5, and 10 as base materials were prepared. The conductive metal precipitates deposited in Alloy No. 10 are Μ B-type borides.

 2

[0100] The plating treatment was performed by the three methods shown in the following a to c.

[0101] a. An Au plating solution containing Co was used as the plating solution. The surface of the steel material was degreased and pickled, and then electroplated. Plating was performed by stirring the solution at room temperature. Pt was used for the counter electrode, the current density was 2 A / dm ² , and the energization time was 0.3 to 4500 seconds.

[0102] b. An Au plating solution containing Pd was used as the plating solution. After the steel material was electrolytically degreased, the steel material from which the surface oxide layer was removed was subjected to hydrofluoric acid cleaning, followed by sulfuric acid cleaning and water cleaning, and subjected to electrolytic plating. Plating was performed by stirring the solution at room temperature. Pt was used for the counter electrode, the current density was 10 A / dm ² , and the energization time was 7 to 75 seconds.

[0103] A high-purity Au plating solution was used as the c plating solution. The steel surface was degreased, pickled, and then electrolyzed. Plating was performed by stirring the solution at 50 ° C. Pt was used for the counter electrode, the current density was 0.2 A / dm ² , and the energization time was 12 to 36 seconds.

[0104] Each bipolar plate member was examined for the average thickness and area coverage of the noble metal plating, penetration resistance, and the presence or absence of glazing after the salt spray test.

[0105] <Average thickness of plating>

 The surface of the member for the nopolar plate was measured with a fluorescent X-ray film thickness meter, and the average value of 5 points was obtained.

Yes

 [0106] Area coverage of creaking>

 Cyclic voltammetry (CV) was measured and calculated from the oxidation-reduction strength.

[0107] <Penetration resistance>

 It was calculated from the resistance of a sample sandwiched between carbon papers.

[0108] <Salt spray test>

 In accordance with JIS Z 2371, 35 ° C, 5% NaCl spraying was performed, and the test time was 24 hours.

[0109] Table 4 shows the conditions of the substrate and the plating solution, and the test results. For reference, the evaluation results for pure Au are also shown in No. 35. [0110] [Table 4]

 Table 4

 * Those with conductive metal compounds on the surface.

 [0111] As shown in Table 4, with No. 26 having a coverage rate exceeding 90%, the corrosion resistance deteriorated and the performance as a bipolar plate member deteriorated. In addition, No. 27, which has a thicker plating and an average plating thickness of 2500 mm, has a very large Au weight per unit area that does not cause deterioration of corrosion resistance, resulting in high costs. Plating is too thick No. 31 was peeled off. In No. 34, which had an average thickness of ¾94 thigh, the corrosion resistance deteriorated even if the area coverage did not exceed 90%, and the performance as a member of the bipolar plate deteriorated.

 Example 3

[0112] A base material for a sheet-shaped bipolar plate member having a chemical composition of Alloy Nos. L, 5, and 10 in Table 1 and having a thickness of 100 / m was prepared, and F1 + F2 + in Table 2 was prepared. A plastic film planar molded body having a configuration using F3 (total thickness: 330 mm) was bonded. A punching process using a Thomson punching die was performed on these pasting members. At this time, the flow path width formed by the plastic film surface molded body was variously changed. Then, three members for various bipolar plates were laminated to form a single fuel cell. This fuel cell single cell In the same way as described above, the influence of the flow path width on leakage (sealability) was investigated. The results are shown in Table 5.

[0113] [Table 5]

 [0114] As shown in Table 5, in any of the materials, the channel width of Sl. 4 mm formed in the plastic film surface molded body was Slο · 39, 42 and 45, and sufficient sealing performance was obtained. It was not obtained. In these examples, sagging occurred in the metal foil when the metal foil and the plastic film surface-molded body were bonded, which caused leakage. In 44ο.44, there was more leakage compared to Νο.38 and 41, which were the same channel width of other materials, although it was acceptable. This is because the strength of alloy 1ο.10, which is the first type titanium, is lower than that of alloys No. 1 and 5, which are stainless steel.

 Example 4

 [0115] Of the materials shown in Table 1, conductive metal precipitates are alloys with MB boride precipitated.

 2

 • Experiments were conducted to produce various bipolar plate members using materials 1 and 4-7.

[0116] The plating treatment was performed by three methods shown in the following d to f.

 [0117] d. After the surface of the material is degreased and washed with an organic solvent, alkali degreased, and water washed, the first step of plating in a gold strike plating solution (ρΗ6), followed by Au plating containing Co Liquid (ρΗ4.

3) In the second stage, the second staking process was performed. The second stage tacking process was performed while controlling the potential. Plating was performed with liquid stirring within a temperature range of room temperature to 60 ° C. Pt was used for the counter electrode, the set current density in the second stage was 2 A / dm ² or less, and the energization time was 0.5 to 25 seconds.

[0118] e. A high-purity Au plating solution (pH 6.8) was used as the plating solution. The surface of the steel was washed with organic solvent, degreased with alkali, washed with water, then pickled to adjust the passive film present on the surface, and then electroplated while controlling the potential. Plating was performed while stirring the solution at 50 ° C. Pt was used for the counter electrode, the standard current density was 0.2 A / dm ² , and the energization time was 2.5 to 25 seconds.

F. An Au plating solution (pH 6.9) containing Pd was used as the plating solution. The surface of the steel was washed with organic solvent, degreased with alkali, washed with water, then pickled to adjust the passive film present on the surface, and then electroplated while controlling the potential. Plating was performed while stirring the solution at 55 ° C. Pt was used for the counter electrode, the standard current density was 0.2 A / dm ² , and the energization time was 10-20 min.

 [0120] For each bipolar plate member, average thickness of precious metal plating, area coverage, initial contact resistance with carbon paper made by Toray, contact resistance after accelerated deterioration durability test, and salt spray test The presence or absence of later occurrence was investigated.

 [0121] <Average thickness of plating>

 The surface of the member for the nopolar plate was measured with a fluorescent X-ray film thickness meter, and the average value of 5 points was obtained.

Yes

 [0122] Area coverage of creaking>

 Observation with a scanning electric microscope! / \ The area of the plated part was measured by image analysis.

 [0123] <Initial contact resistance and contact resistance after accelerated aging test>

 The initial resistance was maintained immediately after plating, and the resistance after accelerated degradation durability test was maintained at 70 ° C, pH3 sulfuric acid adjusted aqueous solution set as simulated conditions in the fuel cell for 24 hours at lV (vs.RHE). The measurement result in the later state was used. V and deviation were also calculated from the resistance of a sample sandwiched between Toray's commercially available carbon paper.

[0124] It should be noted that a resistance value equivalent to gold is indicated as ◯, and a resistance value at the same level as that before gold plating is indicated as ▲. In this case, it was evaluated as X. The numbers in parentheses in Table 6 are the actual measurements (mΩcm ² ) at a load weight of 15 kgf / cm ² .

[0125] <Salt spray test>

 In accordance with JIS Z 2371, 35 ° C, 5% NaCl spraying was performed, and the test time was 24 hours. A comparative evaluation was made based on the degree of occurrence of red coral. In the state where no gold plating is performed, all the substrates are in a corrosive environment in which red coral is not generated.

 [0126] In Table 6, the occurrence status of red coral was evaluated in 10 stages, and the larger the number, the worse the situation. That is, 1 is a force that does not cause red wrinkles at all, 2 is a force that causes discoloration on the surface but does not generate red wrinkles, and 3 a flow red wrinkle due to a fitting defect occurs. 5 or more means that the red flow from the unspecified part has occurred.

 [0127] Table 6 shows the test results.

[0128] [Table 6]

Table 6

As shown in Table 6, in all of the inventive examples, good contact resistance performance and salt spray test results were obtained. If conductive metal compounds are present on the surface, In the example using gold No. l, the initial contact resistance is high and the contact resistance after the accelerated deterioration test is significantly inferior. The change in contact resistance before and after the accelerated degradation test is considered to be degradation due to corrosion products adhering to the surface. In this example, deterioration including red coral was also observed in the salt spray test.

 [0130] Alloy No. l is a Type316L bright annealed material (BA specification) obtained from Saga, and was used after pickling. In Nos. 47 to 49 with gold or gold alloy plating, the initial contact resistance is improved. After the accelerated accelerated test, the adhesion disappears and the surface contact resistance value increases. The same power as l, slightly inferior.

 [0131] The disappearance (dropping) of the plating can be judged to be due to the corrosion of the matrix immediately below the plating caused by different metal contact corrosion (galvanic corrosion) with the plated gold or gold alloy particles. Even when visually observed, the dropout was so remarkable that it could be confirmed. Also in the salt spray test, flow defects that were thought to be due to plating defects were observed, and a noticeable tendency to red lines was observed compared to Alloy No. 1 which was a material before being fitted locally.

 [0132] On the other hand, Nos. 50 to 80 in which the conductive metal compound was exposed on the surface showed markedly superior behavior, particularly in the examples of the present invention. In the materials of Alloy Nos. 4-7, the corrosion resistance of the exposed conductive metal compound has already been confirmed to be superior to that of the matrix. The corrosion resistance has been remarkably improved, so that both corrosion resistance and excellent contact resistance have been achieved (see Examples No. 50, 57, 70, 77).

 [0133] Here, the reason why the galvanic corrosion as seen in Nos. 2 to 4 is not observed is as follows.

[0134] (1) The exposed conductive metal compound itself has good corrosion resistance.

 (2) The potential of the conductive metal deposit should be almost equal to that of the matrix

 (3) Noble metal plating is a form of plating that is finely dispersed in islands.

 [0135] No. 67 is an example in which the average thickness exceeds lOOnm. In this example, the surface ratio with precious metal plating is very high, but it is considered that red coral has occurred due to the tendency of corrosion from the remaining microscopic plating defects.

Industrial applicability According to the present invention, it is possible to provide a polymer electrolyte fuel cell using a membrane electrode assembly that can quickly flow without leaking oxidant gas, fuel gas, and refrigerant. Further, according to the present invention, it is possible to reduce the weight and size of the fuel cell immediately after mass production.

Claims

The scope of the claims  [1] A member for a bipolar plate of a polymer electrolyte fuel cell, which has a through hole for flowing an oxidant gas, a fuel gas and a refrigerant into each flow path, and a flow of the oxidant gas or the fuel gas A first channel and a second channel having a first channel groove for forming a first channel groove and a second channel groove for allowing a refrigerant to flow Of the second surface on which the groove for forming is formed, a plastic film planar molded body is attached to at least the second surface via an adhesive layer, and the plastic film planar molded body includes A bipolar plate member, wherein at least a through-hole for flowing the refrigerant into the flow path is formed.  [2] Base strength of members for nanopolar plates Stainless steel, high alloy steel, titanium, titanium alloy The bipolar plate member according to claim 1, wherein the member is made of aluminum, aluminum alloy, or a clad thereof.  [3] Stainless steel has a conductive carbon type M, M C, M C and MC  23 6 4 2  At least one of the metal-based metal compound and the MB type boride-based metal compound is exposed.  2  The bipolar plate member according to claim 2, wherein the member is a stainless steel.  However, M is a metal element that forms carbide or boride. [4] The base of the bipolar plate member has a maximum thickness of 0.20 mm or less, and the through hole, the first flow path groove and the second flow path groove are press-molded. The bipolar plate member according to any one of claims 1 to 3, wherein the member is formed by one or more kinds of force of punching and injection molding. [5] The substrate of the plastic film planar molded article is polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytetrafluoroetylene (PTF), or polyimide. To 4 for bipolar plates. [6] The planar molded body made of plastic film according to any one of claims 1 to 5, wherein all or part of the first or second channel groove is formed. Nopolar plate member. [7] The plastic film planar molded product is a laminate of a plurality of plastic films formed with through holes or through holes and one or more of the first flow path grooves and the second flow path grooves. Through-holes formed in at least one plastic film, one or more shape forces S of the first flow path groove and the second flow path groove, formed in another plastic film 7. The bipolar plate member according to claim 1, wherein each of the through holes, the first flow path groove, and the second flow path groove has a different shape.  [8] The flow path groove having a plurality of outlets is provided between the through hole formed in the plastic film planar molded body and the second flow path groove. A member for a nopolar plate as described in 1.  [9] The first surface according to any one of claims 1 to 8, wherein the first surface is plated with a noble metal having an average thickness of lOOnm or less and an area coverage of 10 to 90%! / The components for bipolar plates as described in! /. [10] At least one of the first surface and the second surface is provided with island-like dispersed noble metal plating, and island-like dispersion in a portion of the matrix surface other than the portion occupied by the conductive metal compound The member for a bipolar plate according to any one of claims 1 to 8, wherein the thickness of the noble metal plating is not more than lOOnm as an average thickness defined by the following formula. Average thickness (nm) = adhesion amount of precious metal per unit area (gm ² ) X 10 ⁷ / plating precious metal specific gravity (gm ³ )  [11] The bipolar plate member according to [9] or [10], wherein the noble metal is gold or a gold alloy.  12. The bipolar plate member according to claim 10 or 11, wherein the surface coverage A of the conductive metal compound and the surface coverage B of the island-like dispersed noble metal plating satisfy the following relational expression.  5≤A (%) ≤40  5 ≤B (%) ≤ 90 -0.7A (%)  A (%) + B (%) ≤100% [13] The bipolar plate member according to any one of [9] to [12], wherein the island-shaped dispersed precious metal plating is plated in a bath of 0 · 1≤ρΗ≤7.1. [14] The bipolar plate according to any one of claims 1 to 13, wherein the width force S of the channel groove formed by the plastic film planar molded body is 1.20 mm or less. Element.  [15] The adhesive layer contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin. The member for bipolar plates as described in any of the above. [16] A flow path for the refrigerant is formed by using the two members for a bipolar plate according to any one of claims 1 to 15 and bringing the second surfaces into contact with each other through the adhesive layer. Bipolar plate laminate featuring 17. The bipolar plate laminate according to claim 16, wherein the two bipolar plates have the same shape. 18. The adhesive layer contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin. 2. A bipolar plate laminate according to 1. [19] A cell structure of a polymer electrolyte fuel cell, wherein the cell structure is formed through an adhesive layer. 9. A cell structure comprising a laminate of the bipolar plate laminate according to any one of 8 and a membrane electrode assembly. [20] A cell structure comprising a plurality of the cell structures according to claim 19 laminated through an adhesive layer.  [21] The adhesive layer contains at least one tackifier selected from an aromatic hydrocarbon resin, a rosin hydrocarbon resin, or a tempen hydrocarbon resin. The cell structure described in 1.  [22] The member for a bipolar plate according to any one of claims 1 to 15, the bipolar plate laminate according to any one of claims 16 to 18, and the member according to any one of claims 19 to 21 A solid polymer fuel cell comprising one or more of the cell structures.