JP4664611B2 - Fuel cell separator and method for producing the same - Google Patents

Description

  The present invention relates to a fuel cell separator and a manufacturing method thereof, and more particularly to a fuel cell separator using a synthetic resin injection molding method and a manufacturing method thereof.

  In recent years, solid polymer fuel cells have attracted attention as power sources for electric vehicles. A polymer electrolyte fuel cell (PEFC) can generate power even at room temperature, and is being put into practical use for various purposes other than automobiles.

  Generally, in a fuel cell stack, a cathode electrode is disposed on one side with a solid polymer electrolyte membrane interposed therebetween, and an anode electrode is disposed on the other side, and is sandwiched between fuel cell separators (hereinafter simply referred to as “separators”). A single cell configured as described above is stacked, and has a mechanism for generating electric power by an electrochemical reaction between oxygen in the air supplied to the cathode electrode and hydrogen supplied to the anode electrode.

  The separator is used to provide a connection (stacking function) between cells to obtain a required voltage by stacking a plurality of single cells. In addition, hydrogen or air is used as a cell in the fuel cell stack. A function for securing a supply passage for supplying fuel, a function for securing a discharge passage for discharging product reactants to the outside, a function for securing a supply path for a coolant for cooling the fuel cell stack, a function for collecting and extracting electrons, etc. As required.

  Therefore, particularly between the separators in the single cell, airtightness and liquid tightness are required so that hydrogen, air, and water do not leak out of the system. Here, conventionally, a separator in which a seal is integrally formed by a two-color injection molding method has been disclosed (for example, see Patent Document 1).

  The separator according to this document is composed of a metal member provided at the center, a resin member provided on the outer periphery of the metal member, and the resin member coupled to the metal member via an elastic member. Is done. The resin member is provided with gas supply passages and product reactant (water) discharge passages, and in order to ensure the gas tightness and liquid tightness of the gas supply passages and product reactant discharge passages, The outer periphery is sealed. This separator is manufactured as follows.

FIG. 7 is a diagram for explaining a conventional separator manufacturing process. Since the separator is formed symmetrically, only the left side of the separator is enlarged and shown in FIG.
As shown in FIG. 7A, first, the first movable mold 112 (outer peripheral mold) is clamped in a state where the central portion 101, which is the metal member (thin plate), is placed on the fixed mold 111. To do. Then, as shown in FIG. 7B, the first liquid resin is filled into the cavity 113 formed by the fixed mold 111 and the first movable mold 112.

  After the liquid resin is solidified to form the outer peripheral portion 102 which is the resin member, as shown in FIG. 7C, the first movable mold 112 is changed to the second movable mold 114 (elastic member molding mold). Replace the mold and tighten the mold. The second movable die 114 is for molding the elastic member 103 that couples the outer peripheral portion 102 to the central portion 101. Then, as shown in FIG. 7D, the second liquid resin is filled into the cavity 115 formed by the fixed mold 111 and the second movable mold 114. After this liquid resin is solidified, the mold 100 is opened to obtain the separator 100.

  However, in such a two-color injection molding method, as shown on the right side of FIG. 7D, when the second liquid resin for the elastic member 103 is filled, the outer peripheral portion 102 (or the center) In some cases, the liquid resin 103a may enter between the portion 101) and the fixed mold 111 (hereinafter referred to as “backside”). This is because the force for pressing the outer peripheral portion 102 against the fixed mold 111 is weak.

On the other hand, a two-color injection molding method of synthetic resin for the purpose of preventing the occurrence of burrs has been disclosed (for example, see Patent Document 2).
Incidentally, burrs are caused by the fact that the mold surface of the second movable mold is not in close contact with the surface of the molded product due to product shrinkage of the molded product formed by solidifying the first liquid resin. That is, when the second liquid resin enters the gap formed between the surface of the molded product and the mold surface of the second movable mold, unintentionally irregular burrs are generated.

FIG. 8 is a diagram illustrating a conventional two-color injection molding method that prevents the occurrence of burrs.
As shown in FIG. 8A, first, the first movable mold 132 is clamped to the fixed mold 131. On the first movable mold 132 side, a groove 132a is formed in the vicinity of the boundary line where the second liquid resin is joined. Then, as shown in FIG. 8B, the first liquid resin is filled into the cavity 133 formed by the fixed mold 131 and the first movable mold 132.

  After the liquid resin is solidified to form the first molded article 121 having the ribs 121a, the first movable mold 132 is replaced with the second movable mold 134 and clamped as shown in FIG. 8C. At this time, when the first molded product 121 is slightly smaller due to product contraction, the rib 121a is pressed against the surface of the first molded product 121 and the mold surface of the second movable mold 134 without being in close contact with each other. It becomes a state.

Then, as shown in FIG. 8D, the second liquid resin is filled into the cavity 135 formed by the fixed mold 131 and the second movable mold 134. At this time, the liquid resin tries to enter the gap formed between the surface of the first molded article 121 and the mold surface of the second movable mold 134, but the rib 121 a is pressed against the mold surface of the second movable mold 134. Therefore, it is possible to prevent unintentionally irregular burrs from being generated.
Japanese Patent Laying-Open No. 2003-323900 (paragraphs 0053 to 0064, FIG. 10) Japanese Patent Publication No. 5-54805 (page 3, left column, lines 9-36, FIG. 11)

  However, in the conventional two-color injection molding method for preventing burrs, the rib 121a completely prevents the inflow of the second liquid resin, so that the rib 121a is overcome and the first space is formed in a desired space on the first molded article 121. It was not possible to adjust the filling of the liquid resin No. 2. In addition, forming a gate for injecting a liquid resin into a desired space individually on the second movable mold 134 side requires a high level of technology and is troublesome and expensive.

  Accordingly, it is an object of the present invention to provide a fuel cell separator and a method for manufacturing the same that can easily prevent deformation such as a backside.

To solve the above problems, the invention of claim 1 includes a central portion made of a metallic member comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of said central portion, said first becomes the resin member different from the second tree butter made member, interposed between the outer peripheral portion and the central portion, and at least the vicinity of the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A separator for a fuel cell having a coupling portion to cover, wherein the outer peripheral portion has a plurality of discontinuous protrusions projecting at least to the surface position of the coupling portion in the vicinity of the inner peripheral edge thereof. .

  The fuel cell separator according to claim 1 is manufactured by a two-color injection molding method. First, the outer periphery cavity is formed by clamping the first die to the second die on which the central portion is placed. The outer periphery cavity is formed with a recess such that a protrusion protruding at least to the surface position of the coupling portion is formed in the vicinity of the inner periphery of the outer periphery. The outer peripheral portion is formed by filling the outer peripheral portion cavity with a liquid resin and solidifying the liquid resin. Next, the first mold is replaced with the third mold to form the coupling portion cavity. At this time, the protruding portion of the outer peripheral portion is in contact with the mold surface of the third mold, and therefore the outer peripheral portion is pressed into the coupling portion cavity in a state where the vicinity of the inner peripheral edge portion is pressed to the second mold side. Filled with liquid resin. Since the outer peripheral portion is pressed to the second mold side, the liquid resin does not enter between the outer peripheral portion and the second mold, and the back can be prevented. In addition, while the conventional rib completely prevents the inflow of the liquid resin, the protrusion can flow the liquid resin to a desired space using the surrounding space. Therefore, the coupling part having a desired shape can be easily formed.

According to a second aspect of the invention, a central portion made of a metallic member comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion, first different from the first resin member It consists of two tree butter made member, interposed between the outer peripheral portion and the central portion, and a fuel having at least a cover coupling portion outer peripheral edge portion near the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion In the battery separator, the central portion has a plurality of discontinuous protrusions protruding at least to the surface position of the connecting portion in the vicinity of a boundary line with the connecting portion.

  The fuel cell separator according to claim 2 is manufactured by the two-color injection molding method as described above. First, the outer periphery cavity is formed by clamping the first die to the second die on which the central portion is placed. The outer peripheral portion is formed by filling the outer peripheral portion cavity with a liquid resin and solidifying the liquid resin. Next, the first mold is replaced with the third mold to form the coupling portion cavity. At this time, the protrusion at the center is brought into contact with the mold surface of the third mold, and the liquid cavity is filled into the coupling portion cavity in a state where the vicinity of the outer peripheral edge of the center is pressed toward the second mold. be able to. Since the central portion is pressed to the second mold side, the liquid resin does not enter between the central portion and the second mold, thereby preventing the back side.

  The invention according to claim 3 is composed of a central part made of a metal member, a resin member, an outer peripheral part provided on an outer periphery of the central part, and a resin member, wherein the outer peripheral part and the central part A separator for a fuel cell that is interposed therebetween and has a coupling portion that covers at least the vicinity of the inner peripheral edge of the outer peripheral portion and the vicinity of the outer peripheral edge of the central portion, and the outer peripheral portion is in the vicinity of the inner peripheral edge A plurality of discontinuous protrusions projecting at least to the surface position of the coupling part, and the central part is discontinuous projecting at least to the surface position of the coupling part in the vicinity of the boundary line with the coupling part A plurality of protrusions.

  The fuel cell separator according to claim 3 has all the configurations of the fuel cell separator according to claim 1 and claim 2, and is manufactured by the two-color injection molding method as described above. Accordingly, the fuel cell separator according to claim 1 and claim 2 is provided, and the coupling portion liquid resin is between the outer peripheral portion and the second mold, or between the central portion and the second mold. The back can be prevented without entering.

  According to a fourth aspect of the present invention, in the fuel cell separator according to any one of the first to third aspects of the present invention, the outer peripheral portion is located in the vicinity of a boundary line with the coupling portion. It has the rib which protrudes rather than a surface position.

  The fuel cell separator according to claim 4 has the action of the fuel cell separator according to any one of claims 1 to 3 and is manufactured by the two-color injection molding method as described above. The main effects of the fuel cell separator according to claim 4 are as follows. First, the outer periphery cavity is formed by clamping the first die to the second die on which the central portion is placed. A groove for forming a rib projecting from the surface position of the coupling portion on the outer circumferential portion so as to be located on the outer circumferential side from the coupling portion is formed in the cavity for the outer circumferential portion. The outer peripheral portion is formed by filling the outer peripheral portion cavity with a liquid resin and solidifying the liquid resin. Next, the first mold is replaced with the third mold to form the coupling portion cavity. At this time, the ribs on the outer peripheral portion described above are pressed against the mold surface of the third mold. In this state, the coupling portion cavity is filled with a liquid resin. Therefore, even if an unintended gap is formed between the third mold and the second mold, the liquid resin can be prevented from flowing out by the rib, and the generation of burrs is prevented. be able to.

The invention of claim 5 includes a central portion made of a metallic member comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion, first different from the first resin member It consists of two tree butter made member, interposed between the outer peripheral portion and the central portion, and a fuel having at least a cover coupling portion outer peripheral edge portion near the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method for manufacturing a battery separator, comprising: a first mold in which a plurality of recesses are formed such that a protrusion protruding at least to the surface position of the coupling portion is formed in the vicinity of an inner peripheral edge of the outer periphery; A step of clamping the mold to the second mold to form an outer peripheral cavity, a step of filling the outer peripheral cavity with a first liquid resin and solidifying the first cavity, and replacing the first mold with a third mold. Steps and the third mold before the central portion is placed Forming a cavity for the coupling part by clamping the mold to the second mold, and for the coupling part while pressing the protruding part of the outer peripheral part against the second mold side on the mold surface of the third mold And a step of filling the cavity with a second liquid resin and solidifying the second liquid resin.

  The manufacturing method of the fuel cell separator according to claim 5 is a manufacturing method by a two-color injection molding method. First, the first mold is clamped to the second mold to form an outer peripheral cavity. The outer periphery cavity is formed with a recess such that a protrusion protruding at least to the surface position of the coupling portion is formed in the vicinity of the inner periphery of the outer periphery. The outer peripheral portion is formed by filling the outer peripheral portion cavity with a liquid resin and solidifying the liquid resin. Next, the first mold is replaced with the third mold, and the mold is clamped to the second mold on which the central portion is placed to form a coupling portion cavity. At this time, since the protruding portion of the outer peripheral portion comes into contact with the mold surface of the third mold, the liquid resin is added to the coupling portion cavity in a state where the vicinity of the inner peripheral edge of the outer peripheral portion is pressed to the second mold side. Fill. Since the outer peripheral portion is pressed to the second mold side, the liquid resin does not enter between the outer peripheral portion and the second mold, and the back can be prevented. In addition, while the conventional rib completely prevents the inflow of the liquid resin, the protrusion can flow the liquid resin to a desired space using the surrounding space. Therefore, the coupling part having a desired shape can be easily formed.

The invention of claim 6 includes a central portion made of a metallic member comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion, first different from the first resin member It consists of two tree butter made member, interposed between the outer peripheral portion and the central portion, and a fuel having at least a cover coupling portion outer peripheral edge portion near the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method of manufacturing a battery separator, comprising: a step of clamping a first mold to a second mold to form an outer peripheral cavity; and filling the outer peripheral cavity with a first liquid resin. A step of solidifying, a step of replacing the first mold with a third mold, and a discontinuous protrusion of the third mold in the vicinity of a boundary line with the coupling portion to at least a surface position of the coupling portion. A mold is provided on the second mold on which the central part provided with a plurality of protrusions is placed. Forming a coupling portion cavity, and a second liquid resin in the coupling portion cavity while pressing the projection of the central portion against the second mold side on the mold surface of the third mold. And solidifying by solidification.

  The manufacturing method of the fuel cell separator according to claim 6 is a manufacturing method by the two-color injection molding method as described above. First, the first mold is clamped to the second mold to form an outer peripheral cavity. The outer peripheral portion is formed by filling the outer peripheral portion cavity with a liquid resin and solidifying the liquid resin. Next, the first mold is replaced with the third mold, and the mold is clamped to the second mold on which the central portion is placed to form a coupling portion cavity. At this time, since the projecting portion of the central portion comes into contact with the mold surface of the third mold, liquid resin is applied to the coupling portion cavity in a state where the inner side is pressed toward the second mold side from the vicinity of the outer peripheral edge portion of the central portion. Fill. Since the central portion is pressed to the second mold side, the liquid resin does not enter between the central portion and the second mold, thereby preventing the back side.

The invention of claim 7 includes a central portion made of a metallic member comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion, first different from the first resin member It consists of two tree butter made member, interposed between the outer peripheral portion and the central portion, and a fuel having at least a cover coupling portion outer peripheral edge portion near the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method for manufacturing a battery separator, comprising: a first mold in which a plurality of recesses are formed such that a protrusion protruding at least to the surface position of the coupling portion is formed in the vicinity of an inner peripheral edge of the outer periphery; A step of clamping the mold to the second mold to form an outer peripheral cavity, a step of filling the outer peripheral cavity with a first liquid resin and solidifying the first cavity, and replacing the first mold with a third mold. In the vicinity of the boundary line between the step and the third mold A step of clamping the second mold on which the central portion on which a plurality of discontinuous protrusions projecting to the surface position of the coupling portion are provided to form a coupling portion cavity, and the third Filling the cavity for coupling part with a second liquid resin and solidifying it while pressing the protrusions of the outer peripheral part and the protrusion part of the central part against the second mold side on the mold surface of the mold; It is characterized by having.

  The manufacturing method of the fuel cell separator according to claim 7 has all the configurations of the manufacturing method of the fuel cell separator according to claims 5 and 6 described above. Accordingly, the fuel cell separator according to the fifth and sixth aspects is provided with the action according to the manufacturing method of the fuel cell separator, and the coupling portion liquid resin is between the outer peripheral portion and the second die or between the central portion and the second die. It is possible to prevent the backside from entering between.

In the fuel cell separator of the present invention, there is no deformation such as a backside during production, and the reliability of the product can be improved.
According to the method for manufacturing a fuel cell separator of the present invention, it is possible to easily prevent deformation such as a backside.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a plan view of a separator according to this embodiment, and FIG. 2 is a perspective view of the separator according to this embodiment. FIG. 3 is a cross-sectional view taken along line AA of the separator of FIG.
A separator 1 shown in FIG. 1 is one of the components constituting a fuel cell. When a membrane electrode assembly (MEA) in which a cathode electrode and an anode electrode are integrally formed on both sides of a solid polymer electrolyte membrane is laminated. The membrane electrode assembly is disposed on both sides of the membrane electrode assembly so as to sandwich the membrane electrode assembly.

As shown in FIG. 1, the separator 1 comprises a central portion 2 of the metal which is the power generation unit, and a first outer circumferential portion 3 made of tree fat around the central portion 2, the outer peripheral portion 3 center in part 2 bonded to the first resin and the second different tree butter made coupling portion 4 is formed.

  The central part 2 is a stainless steel plate having a rectangular shape. A plurality of projecting portions 21 projecting discontinuously are formed on the inner side (that is, the portion not covered by the connecting portion 4 described later) of the central portion 2 in the vicinity of the outer peripheral edge portion 2a (see FIG. 2). As shown in FIG. 3, the protruding portion 21 is formed so as to protrude at least to a surface position 4 a of the coupling portion 4 described later. Further, it is desirable to perform a primer treatment in the vicinity of the outer peripheral edge 2a of the central portion 2. By doing so, the coupling portion 4 can be suitably attached to the central portion 2 in the manufacturing process described later.

  As shown in FIG. 1 again, the outer peripheral portion 3 is a rectangular frame having a large opening at the center. Since the opening of the outer peripheral part 3 is formed larger than the central part 2, a slight gap 5 is generated between the inner peripheral part 3 a of the outer peripheral part 3 and the outer peripheral part 2 a of the central part 2. Further, in the outer peripheral portion 3, hydrogen gas passages 31..., Oxygen gas passages 32... When the separators 1 are stacked, and product water passages 33 and 33 that are reaction product passages are opened. It is formed to do. The outer peripheral part 3 is a member made of a thermoplastic resin such as engineering plastic, for example, and the corrosion resistance of such gas passages 31 and 32 and the generated water passage 33 can be ensured.

  As shown in FIG. 3, a plurality of projecting portions 34 projecting discontinuously are formed in the vicinity of the inner peripheral edge portion 3 a of the outer peripheral portion 3. About the arrangement | positioning space | interval of the projection part 34, in the manufacturing process of the separator 1 mentioned later, it is necessary to leave so that it may not become resistance of the flow of 2nd liquid resin. And as shown in FIG. 3, the protrusion part 34 is formed so that it may protrude to the surface position 4a of the coupling | bond part 4 mentioned later at least.

  As shown in FIGS. 1 and 3, the connecting portion 4 (dot-patterned portion in FIG. 1) is interposed in a gap 5 formed between the central portion 2 and the outer peripheral portion 3, and the central portion on one side. 2 is formed so as to cover the vicinity of the outer peripheral edge 2 a and the substantially entire outer peripheral part 3. The coupling portion 4 is, for example, a thermosetting resin member such as silicone rubber. Further, the coupling portion 4 is formed with a rib 41 protruding from the surface position 4a (see FIG. 3).

The rib 41 separates the oxygen gas passage 32 formed at one corner from the oxygen gas passage 32 formed at one corner and separates the other gas passage 32 and the generated water passage 33 from each other. In this way, it is formed along each passage (see FIGS. 1 and 2).
The rib 41 is pressed against the membrane electrode assembly (MEA) disposed oppositely when the separators 1 are stacked in order to assemble the fuel cell. By enclosing the gas passage 32 in one with the rib 41, when the separators 1 are stacked, an air passage that is supplied from the gas passage 32 at one corner to the central portion 2 and discharged to the gas passage 32 at the symmetrical position is provided. Secured. Further, since the gas passage 32 and the generated water passage 33 are partitioned by the ribs 41, the sealability of each passage (32, 33, 34) can be ensured.
The separator 1 shown in FIGS. 1 and 2 has been described as ensuring an air flow path for the sake of convenience. However, depending on the orientation of the separator 1 when it is stacked, the separator 1 functions as ensuring a hydrogen flow path. There is also. In addition, the separator 1 also has a function of securing a generated water discharge passage and a cooling water supply passage.

Next, a manufacturing method (process) of the separator 1 described above will be described.
FIG. 4 is a diagram for explaining a manufacturing process of the separator according to the present embodiment. Since the separator is formed symmetrically, only the left side of the separator of FIG. 1 is shown and described in FIG.

  As shown in FIG. 4A, first, the first movable mold 11 (first mold) is clamped to the fixed mold 10 (second mold) on which the central portion 2 is placed. Thereby, as shown in FIG.4 (b), the cavity 12 for outer peripheral parts is formed. The outer peripheral cavity 12 is formed with a recess 11 a in which the above-described protrusion 34 is formed in the vicinity of the inner peripheral edge 3 a of the outer peripheral portion 3. Then, the outer peripheral portion 3 is formed by filling the outer peripheral portion cavity 12 with a liquid resin of engineering plastic and solidifying it.

Next, as shown in FIG. 4C, the first movable mold 11 is replaced with the second movable mold 13 (third mold) and the mold is clamped. Thereby, as shown in FIG.4 (d), the cavity 14 for coupling | bond parts is formed. At this time, the already formed protrusion 34 of the outer peripheral portion 3 abuts against the mold surface 13a of the second movable mold 13, and the protrusion 21 of the central section 2 also contacts the groove 13b of the second movable mold 13. Touch. Therefore, the coupling portion cavity 14 is filled with a liquid resin of silicone rubber in a state where the vicinity of the inner peripheral edge 3a of the outer peripheral portion 3 and the vicinity of the boundary line of the central portion 2 are pressed toward the fixed mold 10 side.
As described above, the protruding portion 34 of the outer peripheral portion 3 protrudes at least to the surface position 4a of the coupling portion 4, but is preferably formed to protrude further than the surface position 4a. By doing so, when the coupling portion cavity 14 is formed, the projection 34 can be elastically deformed by the mold surface 13a of the second movable mold 13 and pressed appropriately.
Moreover, it is preferable that the groove | channel 13b of the 2nd movable mold | type 13 is a groove | channel shallower than the protrusion amount of the projection part 21 so that the projection part 21 of the center part 2 can be pressed.

  Since the outer peripheral part 3 and the central part 2 are pressed to the fixed mold 10 side, the liquid resin does not enter between the outer peripheral part 3 and the fixed mold 10 and can prevent the back side. While the conventional rib completely prevents the liquid resin from flowing, the discontinuous protrusions 34 can flow the liquid resin to a desired space by using the surrounding space. Therefore, the coupling part 4 having a desired shape can be easily formed.

According to the above, the following effects can be obtained in the separator 1 of the present embodiment.
The protrusion 34 of the outer peripheral portion 3 is pressed by the mold surface 13a of the second movable mold 13 and the vicinity of the inner peripheral edge 3a of the outer peripheral portion 3 is pressed to the fixed mold 10 side. It is possible to prevent the resin from going around to the lower side of the outer peripheral portion 3 (back side).
Further, the projection 21 of the central portion 2 is pressed by the groove 13b of the second movable mold 13, and the central portion 2 is pressed near the boundary of the coupling portion 4 to the fixed mold 10 side. At the time of molding, it is possible to prevent the liquid resin from going around to the lower side of the central portion 2 (back side).
Therefore, it is possible to prevent the separator 1 from being deformed due to the back and improve the reliability of the product.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can also implement as follows.
(Modification 1)
FIG. 5 is a diagram illustrating a stacked state of separators according to a modification of the embodiment.
In the embodiment, the protrusion 34 of the outer peripheral part 3 and the protrusion 21 of the central part 2 are formed so as to protrude at least to the surface position 4a of the coupling part 4, but as shown in FIG. It can also be formed as a protruding portion 34 ′ and a protruding portion 21 ′ that protrude from the surface position 4 a of the coupling portion 4. According to this, when the fuel cell is configured, specifically, the ribs 41 are crushed when the separator 1 sandwiching the membrane electrode assembly MEA is stacked and fixed with an appropriate pressure applied thereto. Can be minimized. That is, if only the rib 41 which is a member made of a soft resin is crushed, the compression set becomes large, and in the worst case, the gas flow path is blocked and the performance of the fuel cell may be remarkably deteriorated. However, as shown in FIG. 5 (b), the protrusions 34 'and the protrusions 21' support the membrane electrode assembly MEA arranged to face each other, thereby minimizing the crushing of the ribs 41. Can do. For this reason, a gas flow path can also be secured and the durability of the fuel cell can be improved.

(Modification 2)
Moreover, the said embodiment can also be deform | transformed and implemented as follows.
FIG. 6 is a diagram illustrating a manufacturing process according to a modification of the embodiment. FIG. 6 shows a modification of the portion B surrounded by a circle in FIG. In addition, since a modified example changes a part of structure of the said embodiment, the same code | symbol is attached | subjected about the same component and the description is abbreviate | omitted.

  In the separator of the modified example, the outer peripheral portion 3 is configured to have a rib 35 protruding from the surface position 4a of the coupling portion 4 in the vicinity of the boundary line with the coupling portion 4 (FIGS. 6B and 6B). d) etc.). The manufacturing process of such a separator will be described below.

  First, as shown in FIG. 6A, the first movable mold 15 is clamped to the fixed mold 10 on which the central portion 2 is placed to form the outer peripheral cavity 16 (see FIG. 6B). In this outer periphery cavity 16, a rib 35 protruding from the surface position 4 a (see FIG. 6D) of the coupling portion 4 is formed on the outer circumferential portion 3 so as to be positioned on the outer circumferential side from the coupling portion 4. The groove 15a is formed. Then, as shown in FIG. 6B, the outer peripheral portion 3 is formed by filling the outer peripheral portion cavity 16 with a liquid resin of engineering plastic and solidifying it.

  Next, as shown in FIG. 6C, the first movable mold 15 is replaced with the second movable mold 17 to form the coupling portion cavity 18 (see FIG. 6D). At this time, as shown in FIG. 6 (d), the ribs 35 of the outer peripheral portion 3 come into contact with the mold surface of the second movable mold 17. In this state, the coupling portion cavity 18 is filled with a liquid resin of silicone rubber. In this way, even when a gap is formed between the second movable mold 17 and the fixed mold 10 (the state shown in FIG. 6C), the rib 35 is formed on the outer peripheral portion 3. Thus, the outflow of the liquid resin of silicone rubber can be prevented, and the generation of burrs can be prevented.

  Further, for example, in the above-described embodiment, the central portion 2 is placed on the fixed mold 10 before the outer peripheral portion 3 is formed (that is, in the step of FIG. 4A). 14 may be placed, and may be placed on the fixed die 10 after the outer peripheral portion 3 is formed (that is, in the step of FIG. 4C).

For example, in the said embodiment, although the projection part 34 and the projection part 21 were formed in the outer peripheral part 3 and the center part 2, respectively, you may form only in the outer periphery part 3 or only in the center part 2. FIG. . By not forming in the center part 2, the shape of the center part side can be simplified.
In addition, a thermoplastic resin member such as engineering plastic is used for the outer peripheral portion 3 and a thermosetting resin member such as silicone rubber is used for the joint portion 4. However, these materials are not limited and are appropriately adapted to the application. Can be changed.

  Further, for example, in the embodiment, the mold apparatus is configured by the fixed mold 10, the first movable mold 11 (or 15), the second movable mold 13 (or 17), etc., but the fixed mold 10 is configured by a movable mold. Alternatively, the first movable mold 11 (or 15) and the second movable mold 13 (or 17) can be configured as a fixed mold.

It is a top view of the separator which concerns on this embodiment. It is a perspective view of the separator which concerns on this embodiment. It is the sectional view on the AA line of the separator of FIG. It is a figure explaining the manufacturing process of the separator which concerns on this Embodiment. It is a figure which shows the lamination | stacking state of the separator which concerns on the modification of embodiment. It is a figure which shows the manufacturing process which concerns on the modification of embodiment. It is a figure explaining the manufacturing process of the conventional separator. It is a figure explaining the conventional two-color injection molding method which prevented generation | occurrence | production of the burr | flash.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Separator 2 Center part 2a Outer peripheral edge part 3 Outer peripheral part 3a Inner peripheral edge part 4 Coupling part 4a Surface position 5 Crevice 10 Fixed mold 11 1st movable mold 11a Recessed part 12 Outer cavity cavity 13 2nd movable mold 13a Mold surface 13b Groove 14 Cavity for coupling part 15 First movable mold 15a Groove 16 Cavity for outer peripheral part 17 Second movable mold 17a Mold surface 18 Cavity for coupling part 21 Projection part 31 Gas passage 32 Gas passage 33 Generated water passage 34 Projection part 35 Rib 41 Rib

Claims (7)

A central portion made of a metal member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
The fuel cell separator according to claim 1, wherein the outer peripheral portion has a plurality of discontinuous protrusions protruding at least to the surface position of the coupling portion in the vicinity of the inner peripheral edge thereof. A central portion made of a metallic member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
The fuel cell separator according to claim 1, wherein the central portion includes a plurality of discontinuous protrusions that protrude at least to the surface position of the connecting portion in the vicinity of a boundary line with the connecting portion. A central portion made of a metal member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
The outer peripheral portion has a plurality of discontinuous protrusions protruding at least to the surface position of the coupling portion in the vicinity of the inner peripheral edge thereof, and the central portion is at least near the boundary line with the coupling portion. A fuel cell separator comprising a plurality of discontinuous protrusions protruding to a surface position of a coupling portion.   4. The fuel according to claim 1, wherein the outer peripheral portion has a rib that protrudes from a surface position of the coupling portion in the vicinity of a boundary line with the coupling portion. 5. Battery separator. A central portion made of a metal member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method of manufacturing a separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
A first mold in which a plurality of recesses are formed such that a protrusion protruding at least to the surface position of the coupling part is formed in the vicinity of the inner peripheral edge of the outer peripheral part is clamped to the second mold and the outer peripheral part Forming a cavity for use,
Filling the outer peripheral cavity with the first liquid resin to solidify;
Replacing the first mold with a third mold;
Clamping the third mold to the second mold on which the central portion is placed to form a coupling portion cavity;
Filling the coupling portion cavity with a second liquid resin and solidifying the pressing portion of the outer peripheral portion against the second die side with the mold surface of the third die. A method for producing a fuel cell separator. A central portion made of a metal member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method of manufacturing a separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
A step of clamping the first mold to the second mold to form an outer peripheral cavity;
Filling the outer peripheral cavity with the first liquid resin to solidify;
Replacing the first mold with a third mold;
The second mold in which the third part is placed in the vicinity of the boundary line with the coupling part, and the central part is provided with a plurality of discontinuous protrusions projecting at least to the surface position of the coupling part. Forming a cavity for the coupling part by clamping to a mold,
Filling the second cavity with the second liquid resin and solidifying the second cavity while pressing the projection of the central part against the second mold side with the mold surface of the third mold. A method for producing a fuel cell separator. A central portion made of a metal member ;
Comprises a first tree butter made member, and the outer peripheral portion that is provided on the outer periphery of the central portion,
Made from the second tree butter made member that is different from the first resin member, interposed between said outer peripheral portion central portion and the outer peripheral edge portion of the inner peripheral edge portion and in the vicinity of the central portion of the outer peripheral portion A method of manufacturing a separator for a fuel cell having a coupling portion covering at least the vicinity thereof,
A first mold in which a plurality of recesses are formed such that a protrusion protruding at least to the surface position of the coupling part is formed in the vicinity of the inner peripheral edge of the outer peripheral part is clamped to the second mold and the outer peripheral part Forming a cavity for use,
Filling the outer peripheral cavity with the first liquid resin to solidify;
Replacing the first mold with a third mold;
The third mold is formed into the second mold in which the central portion in which a plurality of discontinuous protrusions projecting to the surface position of the coupling portion are provided in the vicinity of the boundary line with the coupling portion is placed. Tightening to form the coupling cavity;
The bonding portion cavity is filled with a second liquid resin and solidified while pressing the outer peripheral protrusion and the central protrusion toward the second mold with the third mold surface. And a process for producing a separator for a fuel cell.

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