JP5435226B2 - Short-circuit prevention structure for fuel cells - Google Patents

Description

  The present invention relates to a fuel cell, and more particularly to a structure for preventing a short circuit in a fuel cell.

  Conventionally, as shown in FIG. 7A, as a fuel cell external structure, a pair of separators 11 and 21 that are spaced apart from each other and a fluid such as fuel gas sealed between the separators 11 and 21 are sealed. A fuel cell having a gasket 31 is known. As a material of the separators 11 and 21, there is one made of a conductive metal (see Patent Document 1).

  In recent years, with the miniaturization of the fuel cell stack, each cell constituting the stack has been thinned. As a method for thinning the cell, the clearance between the separators 11 and 21 is reduced, or the separators 11 and 21 are thinned. The method of making it into a new is adopted.

  However, if the separators 11 and 21 are thinned in this way, the separators 11 and 21 are easily deformed by a stacking load at the time of stack assembly, so that the separator peripheral portions 11a and 21a come into contact with each other as shown in FIG. As a result, an electrical short circuit may occur and the power generation capacity of the fuel cell may be reduced.

JP 2004-55427 A

  The present invention has been made in view of the above points, and it is an object of the present invention to prevent the peripheral edges of the separators from contacting each other to cause an electrical short circuit, thereby preventing the power generation capability of the fuel cell from being lowered.

In order to achieve the above object, a fuel cell short-circuit prevention structure according to claim 1 of the present invention includes a pair of separators that are spaced apart from each other and a gasket that is disposed between the separators and seals fluid such as fuel gas. In the fuel cell, when the separator is deformed, the separator peripheral portions contact each other so as not to cause an electrical short circuit, and the separator peripheral portion has an insulator, and the gasket is molded with a mold and molded. At the same time, it is attached to one separator, the one separator sets a peripheral edge region where the gasket is not attached outside the gasket attachment region, and the insulator is formed integrally with the gasket by the mold. molding is applied to the peripheral area of the one separator simultaneously with, said insulator rear of the edge and uneven-like Is a formula shape, thereby the insulator in the peripheral area of the one of the separator in which the insulator in addition to the site to be deposited is characterized in that it is configured sites that are not deposited .

  The short-circuit prevention structure according to claim 2 of the present invention is the short-circuit prevention structure according to claim 1, wherein the gasket has a shape in which a seal lip is integrally formed on a pedestal portion having a predetermined thickness, An insulator having the same thickness as the pedestal is integrally formed on the outside of the pedestal.

The short-circuit prevention structure according to claim 3 of the present invention is a fuel cell having a pair of separators that are spaced apart from each other and a gasket that is disposed between the separators and seals a fluid such as fuel gas. In order to prevent an electrical short circuit due to contact between the peripheral edges of the separator, the separator has an insulator on the peripheral edge of the separator. The separator is attached to the separator, and the one separator sets a peripheral region where the gasket is not attached to the outside of the gasket attachment region, and the adhesive layer is formed on the one of the gaskets prior to molding the gasket by the mold. It is one that is formed by applying an adhesive to the surface of the separator gasket deposition territory of the one separator Also simultaneously the peripheral area as applying adhesive provided by applying an adhesive, the adhesive layer provided on the peripheral region of the latter, characterized in that it is an insulator.

The short-circuit prevention structure according to claim 4 of the present invention is a fuel cell including a pair of separators spaced apart from each other and a gasket that is disposed between the separators and seals a fluid such as fuel gas. The separator peripheral parts have an insulator so as not to cause an electrical short circuit when the peripheral parts of the separators are in contact with each other, and the gasket is molded with a mold and attached to one separator at the same time as the molding, The one separator sets a peripheral region where the gasket is not attached to the outside of the gasket attaching region, and the insulator is formed apart from the gasket and at the same time as the peripheral region of the one separator And the insulator is disposed on an outermost peripheral portion of the one separator .

The short-circuit preventing structure according to claim 5 of the present invention is the short-circuit preventing structure according to claim 4, wherein the insulator is made of a non-conductive resin or a non-conductive elastomer of the same kind or different from the gasket molding material. Features.

The short-circuit prevention structure according to claim 6 of the present invention is the short-circuit prevention structure according to claim 4 or 5 , characterized in that the insulator is provided continuously along the longitudinal direction of the gasket.

The short-circuit prevention structure according to claim 7 of the present invention is the short-circuit prevention structure according to claim 4 or 5, wherein the insulator is provided intermittently along the longitudinal direction of the gasket. .

  In the present invention having the above configuration, since the insulator is provided at the separator peripheral portion, the separator peripheral portions are not in direct contact with each other even if the separator is deformed by the presence of the insulator. Short circuit is prevented.

  Further, since a gasket is provided inside the insulator provided at the peripheral edge of the separator, it is conceivable to set an insulator for preventing a short circuit using this gasket. Therefore, in the present invention, the gasket is used as follows.

(1) Some gaskets are molded with a mold and are applied to the separator at the same time as the molding (molds are integrally molded with the separator), and the separator has a gasket outside the gasket application area. A peripheral region that is not deposited is set. In this case, the insulator is formed integrally with the gasket by a metal mold and is attached to the peripheral area of the separator simultaneously with the forming. For example, when the gasket has a shape in which a seal lip is integrally formed on a pedestal portion having a predetermined thickness, an insulator having the same thickness as that of the pedestal portion is integrally formed on the outside of the pedestal portion with a mold, and simultaneously with the molding, a separator is formed. It adheres to the peripheral part area | region. Since the insulator is molded simultaneously with the gasket in a mold, it is not necessary to perform a separate molding process. In the case where the thickness of the insulator is the same as the thickness of the pedestal portion, the forming region of the pedestal portion may be substantially enlarged.

In addition, when the gasket and the insulator are simultaneously molded with the mold and are applied to the separator at the same time as the molding, the molding is performed with the mold pressing and holding the separator in the thickness direction at the time of molding. However, when the insulator is formed in the peripheral region of the separator as described above, since the pressing area by the mold is reduced, the mold cannot sufficiently press the separator, and therefore, the deformation and material of the separator There is a concern that leakage may occur. That is, when the insulator is not formed in the peripheral area of the separator, a large pressing area is secured in the entire peripheral area, so that the mold can sufficiently press the separator. When the insulator is formed in the partial region, the pressing area by the mold is reduced, and the mold may not be able to sufficiently press the separator. Therefore, when there is such a concern, the planar shape of the insulator is made to be a rias shape with the edges being uneven, and the insulator is covered in addition to the portion where the insulator is applied to the peripheral area of the separator. The part which is not worn is set, and thereby the pressing area is secured ( Claim 1 ).

(2) In addition, there are gaskets that are molded with a mold and attached to the separator through an adhesive layer at the same time as the molding (molds are integrally molded with the separator using an adhesive). The separator is provided with a peripheral edge region where the gasket is not attached outside the gasket attached region. In this case, the adhesive layer is also provided in the peripheral area in addition to the gasket deposition region of the separator, the adhesive layer provided on the peripheral area of the latter is an insulator (Claim 3). A gasket is formed on the adhesive layer provided in the former gasket-attached area, but no gasket is formed on the adhesive layer provided in the latter peripheral area, and the latter adhesive layer is exposed on the surface. Will be left. Since the latter adhesive layer is provided simultaneously with the former adhesive layer (the adhesive is applied at the same time), it is not necessary to carry out a separate process (application process) separately.

  In the above (1) and (2), the insulator is set using the presence of the gasket, but the insulator can be set without using the presence of the gasket.

(3) That is, the gasket is molded by a mold and is applied to the separator at the same time as the molding, and a peripheral region where the gasket is not applied is set outside the gasket applied region. Then, simultaneously deposited on the peripheral region of the separator and the molding as well as molding the insulator spaced from the gasket (claim 4). In this case, the insulator is preferably made of a non-conductive resin or non-conductive elastomer of the same or different type as the gasket molding material ( Claim 5 ). In addition to molding by a mold, it is possible to adopt a dispenser method or a screen printing method. In the case of the dispenser method or the screen printing method, the insulator can be disposed on the outermost peripheral portion of the separator ( claim 4 ), so there is no possibility that the peripheral portions of the separator are in direct contact with each other. The insulator is continuously provided along the longitudinal direction of the gasket at a position separated from the gasket ( Claim 6 ). However, as long as the peripheral edges of the separator can be prevented from coming into direct contact for the purpose of installation, May be provided intermittently along the longitudinal direction of the gasket ( claim 7 ).

  The present invention has the following effects.

  That is, according to the present invention, since the insulator is provided at the separator peripheral portion, the short circuit is prevented by interposing the insulator between the separator peripheral portions. Therefore, it is possible to prevent a short circuit from occurring and a decrease in power generation efficiency of the fuel cell. When a gasket is used for setting the insulator, a mold or an adhesive layer can be used, so that much effort is not required for setting the insulator. When the planar shape of the insulator is a rear type, it is possible to secure a wide area for the mold to press and hold the separator during molding, thereby suppressing the occurrence of problems such as deformation of the separator and material leakage. be able to. The insulator may be molded away from the gasket, and as a molding means, a dispenser method or a screen printing method can be used in addition to molding by a mold. In these cases, the insulator is placed on the outermost peripheral portion of the separator. Since arrangement | positioning becomes possible, it can prevent completely that a separator peripheral part contacts directly. The insulator is continuously provided along the longitudinal direction of the gasket, but the short-circuit preventing effect can be exhibited even if provided intermittently.

(A) is principal part sectional drawing of the fuel cell concerning 1st Example of this invention, (B) is principal part sectional drawing which shows the state at the time of a separator deformation | transformation. Partial perspective view of one separator, gasket and insulator according to the same embodiment (A) is principal part sectional drawing of the fuel cell concerning 2nd Example of this invention, (B) is principal part sectional drawing which shows the state at the time of a separator deformation | transformation. (A) is principal part sectional drawing of the fuel cell concerning 3rd Example of this invention, (B) is principal part sectional drawing which shows the state at the time of a separator deformation | transformation. Partial perspective view of one separator, gasket and insulator according to the same embodiment Partial perspective view of one separator, gasket and insulator showing another example of insulator (A) is principal part sectional drawing of the fuel cell which concerns on a prior art example, (B) is principal part sectional drawing which shows the state at the time of separator deformation | transformation. (A) is principal part sectional drawing of the fuel cell concerning a comparative example, (B) is principal part sectional drawing which shows the state at the time of separator deformation | transformation. Partial perspective view of one separator, gasket and insulator according to the comparative example

  The present invention includes the following embodiments.

(A1) In order to prevent a short circuit, an insulating layer is formed at the end of the plate (separator) in each cell constituting the fuel cell stack.
(A2) In order to prevent a short circuit, a rubber insulating layer is integrally formed at the end of the cell at the time of molding the gasket. Furthermore, the shape of the insulating layer is a rear type shape for the purpose of securing a mold pressing portion in the mold during molding.
(A3) In order to prevent a short circuit, in the adhesive application step before forming the gasket, the adhesive is applied not only to the gasket forming part but also to the end of the plate.
(A4) In order to prevent a short circuit, as a process after forming the gasket, an insulating layer is continuously or partially potted and applied to the end of the plate by a dispenser and screen printing.

(B1) In order to prevent a short circuit, a contact-preventing protrusion is provided on the outer peripheral side of the power generation cell in the gasket for a fuel cell formed by integrally molding the gasket on the power generation cell constituent member.
(B2) A projection having a contact prevention function is provided on the outer peripheral side of the power generation cell component-integrated gasket in a rear type to prevent contact of the separator (short circuit prevention). According to this, in addition to preventing a short circuit, since the projection is made a rear type, it is possible to increase the pressure receiving area of the mold clamping other than the projection portion, and it is possible to prevent the deformation of the separator during molding.

(C1) In order to prevent a short circuit, in the gasket for a fuel cell formed integrally using an adhesive layer between the power generation cell constituent member and the gasket, the adhesive layer protrudes from the outer peripheral side of the power generation cell.
(C2) A conventional gasket for a fuel cell is formed as an integral gasket by providing an adhesive layer (adhesive) between the component member and the gasket. In the present invention, the adhesive layer (adhesive) is used as the power generation cell component integrated gasket. By making it protrude to the outer peripheral side, contact prevention (short circuit prevention) of a separator is aimed at.

(D1) In order to prevent a short circuit, in the fuel cell gasket in which the gasket is integrally formed with the power generation cell constituent member, a contact prevention protrusion separate from the fluid seal gasket is provided on the outer peripheral side of the power generation cell. A fuel cell gasket characterized by
(D2) The fuel cell gasket according to (D1), wherein the contact prevention protrusion is a non-conductive resin or elastomer.
(D3) The fuel cell gasket according to (D1) or (D2), wherein the contact prevention protrusion is disposed on the outermost periphery of the power generation cell.
(D4) The fuel cell gasket according to any one of (D1) to (D3), wherein the contact prevention protrusions are continuously applied.
(D5) The gasket for a fuel cell according to any one of (D1) to (D3), wherein the contact prevention protrusion is intermittently applied.
(D6) In order to prevent a short circuit, protrusions for preventing contact are provided in a linear shape or a spot shape on the outer peripheral side of the power generation cell component-integrated gasket to prevent contact between the separators (short circuit prevention). According to this, in addition to preventing a short circuit, it is possible to increase the pressure receiving area of the mold clamping other than the projecting portion, and it is possible to prevent the deformation of the separator during molding. In the case of a spot shape, the amount of use of the members used for the protrusions can be reduced and the weight can be reduced by adjusting the interval between the protrusions.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1A shows a cross section of the main part of a fuel cell according to the first embodiment of the present invention. The cell is shown as an external structure thereof, and a pair of separators 11 spaced apart from each other are illustrated. , 21 and a gasket 31 disposed between the pair of separators 11 and 21 for sealing a fluid such as fuel gas. Between a pair of separators 11 and 21 arranged in parallel to each other, a power generation unit (not shown) made of a membrane electrode assembly and a gas diffusion layer is provided, and a fluid such as fuel gas flowing through the power generation unit is a cell. A gasket 31 is provided so as not to leak outside. The gasket 31 is molded with a mold (not shown) using a rubber-like elastic body such as non-conductive resin or elastomer as a molding material, and is attached to one separator 11 at the same time as the molding (the separator is a mold). 11). The gasket 31 has a shape in which a seal lip 33 having a triangular cross section is integrally formed on the plane of the rectangular base section 32 having a predetermined width and thickness d ₁ . It is deposited on the top surface. The seal lip 33 makes a sealing action by being brought into close contact with the other separator 21, but the close counterpart component may be other separators 21 or other cell components such as the membrane electrode composite or gas diffusion layer. good. Each of the separators 11 and 21 is made of a conductive metal material, and is formed into a thin shape as the stack is downsized. Therefore, there is a possibility that the separator peripheral portions 11a and 21a come into contact with each other due to a stacking load at the time of stack assembling to cause an electrical short circuit. In this embodiment, the following measures are taken. .

  That is, as described above, the gasket 31 is molded by a mold and is simultaneously attached to one separator 11 at the same time as the molding, and the gasket 31 is placed on the outer side (right side in the drawing) of the gasket application region 12. A peripheral region 13 that is not deposited is set, and an insulator 41 is provided in the peripheral region 13.

  The insulator 41 is molded integrally with the gasket 31 by the mold using the same molding material as the gasket 31 and is attached to the peripheral region 13 at the same time as the molding (integrated molding with the gasket 11 together with the gasket 31 by the mold). Have been). Therefore, the insulator 41 is molded simultaneously with the gasket 31 by a mold. When the molding material does not have self-adhesiveness, an adhesive is applied to the adherend surface of the separator 11 prior to molding and deposition to provide an adhesive layer (not shown). An insulator 41 is attached to the separator 11.

The insulator 41 is formed into a film shape or a flat plate shape having the same thickness d ₂ as the thickness d ₁ of the pedestal portion 32 of the gasket 31, and is integrally formed outside the pedestal portion 32. Therefore, when the separators 11 and 21 are not deformed, the insulator 41 is not in contact with the other separator 21.

  Further, as shown in FIG. 2, the insulator 41 is formed in a rias shape having an uneven edge, and thereby the peripheral region 13 of the separator 11 in addition to the portion where the insulator 41 is attached. A region 14 where the insulator 41 is not deposited is set. The Rias type shape means that the planar shape of the edge of the insulator 41 is not a straight line but is formed by a repeated pattern of irregularities. A large number of uneven projections are provided intermittently along the longitudinal direction of the gasket 31, thereby providing an insulating function. On the other hand, there is a region 14 where the insulator 41 is not adhered by the recesses between adjacent projections. Is set.

In the fuel cell having the above configuration, since the insulator 41 integral with the gasket 31 is provided on the peripheral edge 11a of the fuel cell, the insulator 41 is interposed as shown in FIG. Even if the separators 11 and 21 are deformed, the separator peripheral portions 11a and 21a are not in direct contact with each other, thereby preventing a short circuit. Since the insulator 41 is molded simultaneously with the gasket 31 by a mold, it is not necessary to add a molding process for the insulator 41, and therefore the insulator 41 is easily molded. Further, since the thickness d ₂ of the insulator 41 is the same as the thickness d ₁ of the base portion 32 of the gasket 31, so that the insulator 41 be enlarged forming region of the base portion 32 is molded.

  In addition, since the insulator 41 has a planar shape, the insulator 41 is attached to the peripheral region 13 of the separator 11, but the pressing area by a relatively wide mold is reduced. It can be secured in the partial area 13. That is, as shown in FIG. 8 and FIG. 9 as a comparative example, if the insulator 41 is provided over almost the entire surface of the separator peripheral region 13, the pressing area by the mold is hardly set at the time of molding. Although the mold cannot press the separator 11 sufficiently, there is a concern that the separator 11 may be deformed or material is leaked. Therefore, it is possible to prevent these problems from occurring.

Second embodiment ...
FIG. 3 (A) shows a cross section of the main part of a fuel cell according to the second embodiment of the present invention. The cell is shown as an external structure of the pair of separators 11 that are spaced apart from each other. , 21 and a gasket 31 disposed between the pair of separators 11 and 21 for sealing a fluid such as fuel gas. Between a pair of separators 11 and 21 arranged in parallel to each other, a power generation unit (not shown) made of a membrane electrode assembly and a gas diffusion layer is provided, and a fluid such as fuel gas flowing through the power generation unit is a cell. A gasket 31 is provided so as not to leak outside. The gasket 31 is molded by a mold (not shown) using a non-conductive resin or a rubber-like elastic body such as an elastomer as a molding material, and is attached to one separator 11 via the adhesive layer 51 simultaneously with the molding. (It is integrally formed with the separator 11 using an adhesive in a mold). The gasket 31 has a shape in which a sealing lip 33 having a triangular cross section is integrally formed on a plane of a pedestal portion 32 having a predetermined width and thickness, and the lower surface of the pedestal portion 32 is formed on the upper surface of the separator 11. It is attached. The seal lip 33 makes a sealing action by being brought into close contact with the other separator 21, but the close counterpart component may be other separators 21 or other cell components such as the membrane electrode composite or gas diffusion layer. good. Each of the separators 11 and 21 is made of a conductive metal material, and is formed into a thin shape as the stack is downsized. Therefore, there is a possibility that the separator peripheral portions 11a and 21a come into contact with each other due to a stacking load at the time of stack assembling to cause an electrical short circuit. In this embodiment, the following measures are taken. .

  That is, as described above, the gasket 31 is molded by a mold and is simultaneously attached to the one separator 11 via the adhesive layer 51, and the one separator 11 is attached to the outer side of the gasket attachment region 12 (see FIG. In the right side), a peripheral edge region 13 to which the gasket 31 is not attached is set. The adhesive layer 51 is provided not only in the gasket-attached region 12 of one separator 11 but also in the peripheral region 13, and the insulator 41 is constituted by the adhesive layer 51 provided in the latter peripheral region 13. Yes. Since the adhesive layer 51 is formed by applying an adhesive to the surface of the separator 11 prior to the molding of the gasket 31 using a metal mold, the adhesive is applied to the gasket application region 12 in this application step. At the same time, the adhesive is also applied to the peripheral area 13. The application is performed over the entire surface of the peripheral region 13, but the purpose of the application is to prevent a short circuit, so that the application may be partial as long as the short circuit can be prevented. The adhesive is non-conductive.

  In the fuel cell having the above-described configuration, since the insulator 41 made of the adhesive layer 51 is provided on the separator peripheral edge portion 11a, the insulator 41 is interposed so that the insulator 41 is interposed as shown in FIG. Even if the separators 11 and 21 are deformed, the separator peripheral portions 11a and 21a are not in direct contact with each other, thereby preventing a short circuit. The adhesive layer 51 applies the adhesive at the same time to the part where the gasket 31 is applied and the part to be the insulator 41, so there is no need to add an application process for the insulator 41. Is easily molded.

Third embodiment ...
FIG. 4A shows a cross section of the main part of a fuel cell according to a third embodiment of the present invention, and the cell is shown as an external structure thereof, and a pair of separators 11 that are spaced apart from each other are illustrated. , 21 and a gasket 31 disposed between the pair of separators 11 and 21 for sealing a fluid such as fuel gas. Between a pair of separators 11 and 21 arranged in parallel to each other, a power generation unit (not shown) made of a membrane electrode assembly and a gas diffusion layer is provided, and a fluid such as fuel gas flowing through the power generation unit is a cell. A gasket 31 is provided so as not to leak outside. The gasket 31 is molded with a mold (not shown) using a rubber-like elastic body such as non-conductive resin or elastomer as a molding material, and is attached to one separator 11 at the same time as the molding (the separator is a mold). 11). The gasket 31 has a shape in which a seal lip 33 having a triangular cross section is integrally formed on the plane of the rectangular base section 32 having a predetermined width and thickness d ₁ . It is deposited on the top surface. The seal lip 33 makes a sealing action by being brought into close contact with the other separator 21, but the close counterpart component may be other separators 21 or other cell components such as the membrane electrode composite or gas diffusion layer. good. Each of the separators 11 and 21 is made of a conductive metal material, and is formed into a thin shape as the stack is downsized. Therefore, there is a possibility that the separator peripheral portions 11a and 21a come into contact with each other due to a stacking load at the time of stack assembling to cause an electrical short circuit. In this embodiment, the following measures are taken. .

  That is, as described above, the gasket 31 is molded by a mold and is simultaneously attached to one separator 11 at the same time as the molding, and the gasket 31 is placed on the outer side (right side in the drawing) of the gasket application region 12. A peripheral region 13 that is not deposited is set, and an insulator 41 is provided in the peripheral region 13.

The insulator 41 is formed on the outer side of the gasket 31 so as to be separated from the gasket 31 and is attached to the peripheral region 13 simultaneously with the forming. The insulator 41 is molded by a dispenser method or a screen printing method using a rubber-like elastic body such as a non-conductive resin or elastomer of the same kind or different type as the molding material of the gasket 31, and the outermost periphery of one separator 11. It is arranged in the part. Therefore, the insulator 41 is formed after the gasket 31 is formed. The insulator 41 is formed in a rectangular or trapezoidal cross section, and its thickness d ₃ is substantially the same as the thickness d ₁ of the pedestal 32 of the gasket 31. Therefore, when the separators 11 and 21 are not deformed, the insulator 41 is not in contact with the other separator 21. In addition, as shown in FIG. 5, the insulator 41 is continuously provided along the longitudinal direction of the gasket 31.

  In the fuel cell having the above-described configuration, since the insulator 41 is provided separately from the gasket 31 at the separator peripheral edge portion 11a, the insulator 41 is interposed so that the separator 41 is interposed as shown in FIG. Even if the separators 11 and 21 are deformed, the separator peripheral portions 11a and 21a are not in direct contact with each other, thereby preventing a short circuit. Further, since the insulator 41 is disposed on the outermost peripheral portion of the separator 11, it is possible to completely prevent the separator peripheral portions 11a and 21a from coming into direct contact with each other.

  In this embodiment, the insulator 41 is continuously provided along the longitudinal direction of the gasket. However, the insulator 41 is intermittently provided along the longitudinal direction of the gasket as shown in FIG. May be provided.

11, 21 Separator 11a, 21a Separator peripheral part 12 Gasket adherence area 13 Peripheral part area 14 Part where insulator is not attached 31 Gasket 32 Base part 33 Seal lip 41 Insulator 51 Adhesive layer

Claims (7)

In a fuel cell having a pair of separators spaced apart from each other and a gasket arranged between the separators and sealing a fluid such as fuel gas,
When the separator is deformed, the separator peripheral portions contact each other so as not to cause an electrical short circuit, and the separator peripheral portion has an insulator,
The gasket is molded with a mold and attached to one separator at the same time as the molding, and the one separator sets a peripheral region where the gasket is not attached to the outside of the gasket attached region, The mold is integrally formed with the gasket and is attached to the peripheral area of the one separator simultaneously with the molding ,
The insulator is formed in a rias shape with an uneven edge, so that in the peripheral region of the one separator, there is a portion where the insulator is not deposited in addition to the portion where the insulator is deposited. A short-circuit prevention structure for a fuel battery cell, characterized by being set . In the short-circuit preventing structure according to claim 1,
The gasket has a shape in which a seal lip is integrally formed on a pedestal portion having a predetermined thickness, and an insulator having the same thickness as the pedestal portion is integrally formed on the outside of the pedestal portion. Short-circuit prevention structure for fuel cells. In a fuel cell having a pair of separators spaced apart from each other and a gasket arranged between the separators and sealing a fluid such as fuel gas,
When the separator is deformed, the separator peripheral portions contact each other so as not to cause an electrical short circuit, and the separator peripheral portion has an insulator,
The gasket is molded by a mold and is attached to one separator through an adhesive layer at the same time as the molding, and the one separator sets a peripheral region where the gasket is not attached outside the gasket application region. The adhesive layer is formed by applying an adhesive to the surface of the one separator prior to the molding of the gasket by the mold, and adheres to the gasket application area of the one separator. The fuel battery cell is characterized in that it is provided by applying an adhesive to the peripheral area at the same time as the agent is applied, and the adhesive layer provided in the latter peripheral area is used as an insulator. Short-circuit prevention structure. In a fuel cell having a pair of separators spaced apart from each other and a gasket arranged between the separators and sealing a fluid such as fuel gas,
When the separator is deformed, the separator peripheral portions contact each other so as not to cause an electrical short circuit, and the separator peripheral portion has an insulator,
The gasket is molded with a mold and attached to one separator at the same time as the molding, and the one separator sets a peripheral region where the gasket is not attached to the outside of the gasket attached region, It is molded away from the gasket and is attached to the peripheral area of the one separator simultaneously with the molding ,
The structure for preventing a short circuit of a fuel cell, wherein the insulator is disposed on an outermost peripheral portion of the one separator . The short circuit prevention structure according to claim 4 ,
A structure for preventing a short circuit in a fuel cell, wherein the insulator is made of a non-conductive resin or non-conductive elastomer of the same or different type as the gasket molding material. The short-circuit prevention structure according to claim 4 or 5 ,
A structure for preventing a short circuit of a fuel cell, wherein the insulator is provided continuously along the longitudinal direction of the gasket. The short-circuit prevention structure according to claim 4 or 5 ,
A fuel cell short-circuit prevention structure, wherein the insulator is provided intermittently along the longitudinal direction of the gasket.

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