JP2008293789A - Fuel cell, and method and apparatus for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell in which seals are joined without using an adhesive and moisture generated by electrode reaction is promptly discharged. <P>SOLUTION: A first seal 56 is provided to a first separator 20 in an injection station. Next, ultraviolet rays are irradiated on the first seal 56 in an ultraviolet irradiation station. Thereby, the first seal 56 is activated. In this case, firstly, ultraviolet rays to generate ozone from oxygen are irradiated, then, ultraviolet rays to generate oxygen atoms in excited state from ozone are irradiated, and a hydrophilic group is formed on the surface of the first seal 56. This first separator 20 and a second separator 22 having a second seal 58 similarly activated are superimposed. In this case, at least parts of the first seal 56 and the second seal 58 applied with activation and hydrophilic treatment are superimposed and integrated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell including a single cell in which an electrolyte / electrode assembly is interposed between a pair of separators, a manufacturing method thereof, and a manufacturing apparatus for manufacturing the fuel cell.

  A fuel cell usually includes a single cell configured by sandwiching an electrolyte / electrode assembly between a pair of separators. In the single cell having such a configuration, seals are formed on both side edges of the separator. During operation of the fuel cell, a fuel gas containing hydrogen is supplied to the anode side electrode constituting the electrolyte-electrode assembly, and an oxidant gas containing oxygen is supplied to the cathode side electrode. The The seal is for preventing these fuel gas and oxidant gas from leaking out of the fuel cell.

  As described in Patent Documents 1 to 3, a seal between separators is generally joined through an adhesive.

JP 2005-166425 A JP 2005-294098 A JP 2006-302741 A

  However, when joining seals via an adhesive, it is necessary to select an adhesive that is compatible with the seal. This selection requires repeated experiments (compatibility evaluation), which takes a long time and is complicated.

  Moreover, it is not preferable to apply the adhesive to a portion other than the seal portion. Therefore, in order not to apply the adhesive other than the seal part, the accuracy of the application work is required, and for this reason, the problem that the manufacture is not easy has become obvious. Further, it has been pointed out that the thickness of the fuel cell increases as the adhesive is applied.

  In addition, if heat treatment is performed at a temperature at which the seal is welded to cure the adhesive, the seal and the electrolyte / electrode assembly may be deteriorated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuel cell in which seals are joined to each other without using an adhesive, a manufacturing method thereof, and a manufacturing apparatus thereof.

In order to achieve the above object, the present invention comprises a single cell in which an electrolyte-electrode assembly in which an anode side electrode and a cathode side electrode are arranged via an electrolyte is interposed between a pair of separators. A fuel cell,
The single cell has a first separator having a first seal irradiated with ultraviolet light, and a second separator having a second seal irradiated with ultraviolet light,
At least a part of the first seal and the second seal are joined to each other by overlapping the first separator and the second separator.

  That is, in the present invention, the first seal and the second seal are irradiated with ultraviolet rays. As a result, both the seals are activated, and as a result, the two seals are polymerized while being integrated with each other at the overlapped portions. That is, the seals are firmly bonded and cured without using an adhesive.

  Thus, according to the present invention, no adhesive is required. For this reason, the troublesome operation | work which selects the adhesive agent with compatibility with a seal | sticker becomes unnecessary. In addition, since the operation of accurately applying the adhesive is not required, the fuel cell can be easily manufactured. In addition, the thickness of the fuel cell can be reduced by the absence of the adhesive layer. Furthermore, since it is not necessary to perform a high-temperature heat treatment to cure the adhesive, it is possible to avoid deterioration of the seal and the electrolyte / electrode assembly.

  In this case, a seal irradiated with ultraviolet rays may be provided in the reaction gas flow path provided in the first separator and the second separator for circulating the reaction gas. As a result, the seal is subjected to a hydrophilization treatment, so that it is possible to avoid blistering in the reaction gas flow path. Eventually, the reaction gas flow passage is prevented from being narrowed, so that an increase in pressure loss when the reaction gas is circulated can be avoided.

Further, the present invention includes a single cell in which an electrolyte / electrode assembly in which an anode side electrode and a cathode side electrode are disposed via an electrolyte is interposed between a first separator and a second separator. A method of manufacturing a fuel cell comprising:
Providing a first seal and a second seal on the first separator and the second separator, respectively;
Irradiating the first seal and the second seal with ultraviolet rays;
By overlapping the first separator and the second separator with the electrolyte-electrode assembly interposed between the first separator and the second separator, the first seal and the second separator are overlapped. Forming at least a portion of the two seals together to form the single cell;
It is characterized by having.

  By going through such a process, it becomes possible to firmly join the seals without using an adhesive and cure them in an integrated state to obtain a fuel cell.

  In the seal irradiated with ultraviolet rays, for example, siloxane bond dissociation occurs. The seal is activated due to this disengagement. Thus, the seals in the active state are polymerized while being integrated when they are overlapped. Thereby, seals can be firmly joined and integrated without using an adhesive.

  In addition, the suitable wavelength of the ultraviolet-ray irradiated to a seal | sticker is 283 nm or less.

  Moreover, it is preferable to irradiate the said seal | sticker provided in the said 1st separator and the said 2nd separator with an ultraviolet-ray, and to thereby hydrophilize the surface of this seal | sticker. It is difficult for moisture to remain on the hydrophilic seal. For this reason, it can be avoided that water vapor enters between the seal and the separator to generate blisters.

This hydrophilization can be carried out, for example, by irradiating the ultraviolet rays having a wavelength for forming O ₂ to O ₃ and a wavelength for forming an excited oxygen atom from O ₃ . In this case, the wavelength for forming O ₂ to O ₃ may be 185 nm or less, and the wavelength for forming an excited oxygen atom from O ₃ may be 254 nm.

Furthermore, it is preferable to irradiate the ultraviolet rays also to the reaction gas flow path provided in the first separator and the second separator for circulating the reaction gas. In this case, H ₂ O (mainly water vapor) generated by the electrode reaction is easily discharged along with the spent reaction gas. In addition, the ultraviolet irradiation with respect to the reaction gas channel is performed simultaneously with the ultraviolet irradiation with respect to the seal.

  Moreover, you may make it heat a 1st seal | sticker and a 2nd seal | sticker. This is because the heated seal further promotes the polymerization reaction, which further improves the bonding strength.

Furthermore, the present invention includes a single cell in which an electrolyte-electrode assembly in which an anode side electrode and a cathode side electrode are disposed via an electrolyte is interposed between a first separator and a second separator. A fuel cell manufacturing apparatus for manufacturing a fuel cell,
A seal forming mechanism for providing a first seal and a second seal on the first separator and the second separator,
An ultraviolet irradiation mechanism for irradiating the first seal and the second seal with ultraviolet rays;
It is characterized by having.

  According to the present invention, since the ultraviolet irradiation mechanism for irradiating the seal with ultraviolet rays is provided, the fuel cell can be provided without using an adhesive.

  In this case, in order to perform the above-described hydrophilization, the ultraviolet irradiation mechanism preferably includes a light source that emits ultraviolet rays having different wavelengths.

  In the present invention, ultraviolet rays are irradiated on the seals provided in each of the pair of separators, and then a single cell is configured by interposing an electrolyte / electrode assembly between the separators. Are superimposed on each other in an activated state. For this reason, the seals are firmly bonded to each other without using an adhesive, and are integrally cured.

  Ultimately, according to the present invention, no adhesive is required. This eliminates the need for selecting an adhesive that is compatible with the seal and for accurately applying the adhesive, thereby enabling efficient production of the fuel cell. Further, the thickness of the fuel cell can be reduced by the absence of the adhesive layer, which contributes to the miniaturization of the fuel cell.

  Hereinafter, preferred embodiments of the fuel cell, the manufacturing method thereof, and the manufacturing apparatus thereof according to the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1 and 2 are an exploded perspective view and a vertical cross-sectional view of the main part of a stack 10 provided in the fuel cell according to the present embodiment, respectively.

  The stack 10 includes an electrolyte / electrode assembly 18 configured by sandwiching an electrolyte 16 between an anode side electrode 12 and a cathode side electrode 14, and a first separator 20 and a second separator that sandwich the electrolyte / electrode assembly 18. And a single cell 24 composed of 22. In the present embodiment, the first separator 20 and the second separator 22 are made of stainless steel such as SUS304 or SUS316.

  Among these, the anode side electrode 12 and the cathode side electrode 14 each have a gas diffusion layer facing the electrolyte 16 side and an electrode catalyst layer joined to the gas diffusion layer. Such configurations of the anode-side electrode 12 and the cathode-side electrode 14 are known, and therefore are not shown here and will not be described in detail.

  On the other hand, in FIG.1 and FIG.2, the 1st gas inlet channel 30 for distribute | circulating oxidizing gas is provided in each upper left corner part of the 1st separator 20 and the 2nd separator 22, The diagonal A first gas outlet passage 32 for circulating used oxidant gas is provided at the lower right corner, which is the position. Similarly, a second gas inlet passage 34 for allowing fuel gas to pass therethrough is provided in the upper right corner, and in the lower left corner, which is the diagonal position, used fuel gas is allowed to pass. The second gas outlet passage 36 is provided. The first separator 20 and the second separator 22 are further provided with a refrigerant inlet passage 38 extending from the first gas inlet passage 30 toward the second gas inlet passage 34, while the second gas outlet passage 36 extends from the first separator 20 and the second separator 22. A refrigerant outlet passage 40 extending toward the one gas outlet passage 32 is provided.

  A wave-like fuel gas passage portion 42 in which peaks and valleys are alternately formed on the surface of the first separator 20 facing the anode side electrode 12 in order to supply and discharge fuel gas to and from the anode side electrode 12. Is curved and extends. As shown in FIG. 2, the top surface of the fuel gas passage 42 is separated from the anode side electrode 12. As a result, a hollow portion 44 is formed between the fuel gas passage portion 42 and the anode electrode 12, and the fuel gas is circulated through the hollow portion 44.

  On the other hand, the second separator 22 is provided with a wave-like oxidant gas passage 46 that protrudes on the opposite side to the fuel gas passage 42 of the first separator, and each top surface of the oxidant gas passage 46. Protrudes toward the first separator 20. Accordingly, a hollow portion 48 is formed between the oxidant gas passage portion 46 and the cathode side electrode 14 as the top surface is separated from the cathode side electrode 14, and the oxidant gas is contained in the hollow portion 48. Distributed.

  Further, since the top surfaces of the fuel gas passage portion 42 of the first separator 20 and the oxidant gas passage portion 46 of the second separator 22 protrude on opposite sides, the fuel gas passage portion 42 and the oxidant gas passage portion 46 The top surfaces are separated from each other. A communication passage 50 is formed by this separation, and the refrigerant introduced from the refrigerant inlet passage 38 flows through the communication passage 50 and reaches the refrigerant outlet passage 40.

  In each of the first separator 20 and the second separator 22, a branch path 52 that branches from the refrigerant inlet passage 38 toward the communication path 50, and a focusing path for condensing the refrigerant from the communication path 50 to the refrigerant outlet passage 40. 54 is provided.

  The first gas inlet passage 30, the first gas outlet passage 32, the second gas inlet passage 34, the second gas outlet passage 36, the refrigerant inlet passage 38, and the refrigerant outlet are provided on both surfaces of the first separator 20 and the second separator 22. A first seal 56 and a second seal 58 are provided around the passage 40, the branch path 52, and the focusing path 54, respectively. A suitable material for the first seal 56 and the second seal 58 is silicone rubber.

  Here, as shown in FIG. 2, the portion provided on the surface facing the second separator 22 in the first seal 56 in the first separator 20, and the second in the second seal 58 in the second separator 22. The portions provided on the surface facing the 1 separator 20 are overlapped with each other after being irradiated with ultraviolet rays, and are cured in this state.

  In the prior art, the seal of the first separator 20 and the seal of the second separator 22 are bonded via an adhesive, but in the present embodiment, these are irradiated with ultraviolet rays without passing through the adhesive. It is hardened integrally. That is, the first seal 56 of the first separator 20 and the second seal 58 of the second separator 22 are combined to form one seal. In FIG. 2, for convenience, a broken line is attached between the first seal 56 and the second seal 58 to indicate a boundary portion before the integration of the two.

  Thus, by integrating the first seal 56 and the second seal 58 without using an adhesive, the thickness of the stack 10 and consequently the fuel cell can be reduced, and as a result, the fuel cell can be miniaturized. Can do. This is because the thickness of the adhesive is reduced.

  In this case, at least with respect to the first gas inlet passage 30, the first gas outlet passage 32, the second gas inlet passage 34, the second gas outlet passage 36, and the first seal 56 and the second seal 58 around these passages. It is preferable that a hydrophilic treatment is performed by the ultraviolet irradiation. The reason for this will be explained later.

  When operating the fuel cell configured as described above, after the temperature of the fuel cell is raised to a predetermined temperature, a fuel gas such as a hydrogen-containing gas passes through the second gas inlet passage 34 from the hollow portion 44 to the anode. While being supplied to the side electrode, an oxidant gas such as air is supplied from the hollow portion 48 to the cathode side electrode 14 through the first gas inlet passage 30. In the presence of these reaction gases, an electrode reaction occurs at each of the electrodes 12 and 14. During the operation of the fuel cell, the single cell 24, that is, the electrolyte / electrode assembly 18, the first separator 20, and the second separator 22 are supplied via the refrigerant inlet passage 38 and the branch passage 52, and the communication passage 50. It is cooled by a refrigerant (cooling water or the like) that passes through.

  The spent fuel gas and the oxygen-containing gas are discharged to the outside of the stack 10 through the second gas outlet passage 36 and the first gas outlet passage 32, respectively. The refrigerant that has cooled the single cell 24 by flowing from the branch path 52 via the communication path 50 is collected in the refrigerant outlet path 40 via the converging path 54, and finally flows through the refrigerant outlet path 40. Then, it is discharged outside the stack 10.

During the operation of the fuel cell in this way, H ₂ O (mainly water vapor) is generated by the electrode reaction. This H ₂ O reaches the second gas outlet passage 36 or the first gas outlet passage 32 along with the used oxidant gas or fuel gas.

  Here, as described above, the first gas inlet passage 30, the first gas outlet passage 32, the second gas inlet passage 34, the second gas outlet passage 36, and the first seal 56 provided around these passages, In other words, each of the second seals 58, in other words, the reaction gas flow path surface from the first gas inlet passage 30 to the second gas outlet passage 36 is subjected to a hydrophilic treatment by being irradiated with ultraviolet rays. Yes. For this reason, the contact angle of moisture is remarkably reduced on the flow path surface of the reaction gas, so that moisture enters the first gas outlet passage 32 or the second gas outlet passage 36 from the first gas inlet passage 30 or the second gas inlet passage 34 side. Passes quickly toward. Eventually, the moisture is easily discharged to the outside of the stack 10 together with the oxidant gas or the fuel gas.

  In other words, moisture hardly stays in the first gas outlet passage 32 and the second gas outlet passage 36. Therefore, for example, it is avoided that water vapor enters between the first seal 56 or the second seal 58 and the first separator 20 or the second separator 22 to generate blisters. When a blister is generated, the first gas outlet passage 32 and the second gas outlet passage 36 (reaction gas flow passage) are narrowed and the pressure loss increases. According to this embodiment, such inconvenience is avoided. can do.

  This fuel cell can be manufactured as follows.

  FIG. 3 is a block diagram of the main components of a fuel cell manufacturing apparatus (hereinafter also simply referred to as manufacturing apparatus) 60 according to the present embodiment. The manufacturing apparatus 60 includes an injection molding station 62 in which a first seal 56 and a second seal 58 are provided on each of the first separator 20 and the second separator 22 by injection molding, and the first seal 56 and the second seal 58. And an ultraviolet irradiation station 64 for irradiating ultraviolet rays.

  An injection molding machine 70 shown in FIG. 4 is disposed at the injection molding station 62. The edge of the first separator 20 or the second separator 22 having a plurality of spherical or thick holding members 71 having a diameter corresponding to the thickness of the first seal 56 or the second seal 58 fixed to the injection molding machine 70. Set.

  The injection molding machine 70 includes a first lower mold 72 and an upper mold 74, and a cavity 86 is formed between the first lower mold 72 and the upper mold 74. The upper die 74 has gates 78 and 80 that are in communication with the cavity 86 and are filled with a melt 76a (see FIG. 5) and a melt 76b (see FIG. 6) to be the first seal 56 or the second seal 58, respectively. Is provided. In addition, runners 82 and 84 for injecting a sealing composition supplied from a first cylinder or a second cylinder (not shown) are formed in the vicinity of each of the gates 78 and 80.

In the configuration as described above, as shown in FIG. 5, the melt 76 a that becomes the first seal 56 (or the second seal 58) is supplied from the first cylinder. The melt 76 a is injected into the cavity 86 through the runner 82 and the gate 78. The injection conditions may be, for example, an injection mold temperature of 373 to 473K (100 to 200 ° C.) and an injection pressure of the melts 76a and 76b of 1.5 to 10 MPa (150 to 1000 kg / cm ² ).

  After the melt 76a is solidified, the first lower mold 72 is separated from the upper mold 74. That is, mold opening is performed. Next, as shown in FIG. 6, mold closing is performed using the second lower mold 88 instead of the first lower mold 72, and the cavity 90 is formed between the upper mold 74 and the second lower mold 88. The melt 76 b supplied from the second cylinder is injected into the cavity 90 through the runner 84 and the gate 80.

  At the time of the above injection, the holding member 71 fixed to the first separator 20 contacts the upper mold 74. For this reason, when the upper die 74 is clamped relatively to the first lower die 72 and the second lower die 88, the first separator 20 is pressed through the holding member 71, and as a result, the first Warp, undulation, distortion, etc. existing in one separator 20 are corrected. Eventually, the first seal 56 has a substantially constant thickness.

  Similarly, a second seal 58 is provided for the second separator 22.

  Next, as shown in FIG. 3, the first seal 56 and the second seal 58 are irradiated with ultraviolet rays at the ultraviolet irradiation station 64. Here, although not illustrated, the ultraviolet irradiation station 64 includes a first light source for irradiating ultraviolet rays having a wavelength of 185 nm or less and a second light source for irradiating ultraviolet rays having a wavelength of 254 nm. As the first light source and the second light source, known ones such as a high pressure mercury lamp, a low pressure mercury lamp, a metal halide, a YAG laser may be appropriately employed.

The first seal 56 (or the second seal 58) is first irradiated with ultraviolet light having a wavelength of 185 nm or less from the first light source. This ultraviolet light is absorbed by oxygen (O ₂ ), and as a result, ozone (O ₃ ) is generated. Next, the first seal 56 (or the second seal 58) is irradiated with ultraviolet light having a wavelength of 254 nm from the second light source, whereby excited oxygen atoms are generated from the O ₃ . The irradiation time may be about 20 seconds for both ultraviolet rays, for example.

  This oxygen atom has a large oxidizing power, and thus reacts with an organic compound contained in the first seal 56 (or the second seal 58). As a result, a hydrophilic functional group such as a carbonyl group or a carboxyl group is generated on the surface of the first seal 56 (or the second seal 58). That is, the hydrophilic treatment is performed on the first seal 56 (or the second seal 58).

  At the same time, in the first seal 56 (or the second seal 58), the siloxane bond is dissociated by the irradiation of ultraviolet rays. Due to this disengagement, the first seal 56 (or the second seal 58) is activated.

  When the first seal 56 (or the second seal 58) is irradiated with ultraviolet rays in this way, the first gas inlet passage 30, the first gas outlet passage 32, the second gas inlet passage 34, and the second gas outlet passage 36 are provided. Each of these is simultaneously irradiated with ultraviolet rays. As a result, each of the first gas inlet passage 30, the first gas outlet passage 32, the second gas inlet passage 34, and the second gas outlet passage 36 is also subjected to a hydrophilic treatment.

  As described above, the electrolyte / electrode assembly 18 is interposed between the first separator 20 and the second separator 22 in which the first seal 56 and the second seal 58 are subjected to the hydrophilic treatment and the activation treatment. A single cell 24 is formed. The single cell 24 may be heat-treated at 70 ° C. for about 30 minutes. In this case, the polymerization reaction of the first seal 56 and the second seal 58 described later is further promoted, which is preferable.

  Next, if a stack 10 (see FIGS. 1 and 2) configured by laminating a predetermined number of single cells 24 is sandwiched between end plates or the like and then tightened with tie rods or the like from both ends, a fuel cell is obtained. . At this time, the first seal 56 on the surface facing the second separator 22 in the first separator 20 and the second seal 58 on the surface facing the first separator 20 in the second separator 22 are overlapped with each other.

  Thereafter, the first seal 56 and the second seal 58 which are in an active state and are overlapped with each other are polymerized in an integrated state, and as a result, are firmly cured. As described above, by performing ultraviolet irradiation, the first seal 56 and the second seal 58 can be firmly joined to each other without using an adhesive.

  This phenomenon is also caused by raising the temperature to a predetermined temperature in order to operate the fuel cell. Of course, the heat treatment may be performed on the single cell 24 or the stack 10 at a temperature that promotes the polymerization reaction of the first seal 56 and the second seal 58 before the operation. In this case, since the polymerization reaction of the first seal 56 and the second seal 58 is further accelerated, there is an advantage that the bonding strength of the cured first and second seals 56 and 58 is further improved.

  Even after curing, carbonyl groups, carboxyl groups, and the like remain on the first seal 56 and the second seal 58. Accordingly, the hydrophilicity of the first seal 56 and the second seal 58 is maintained, and as described above, it is possible to avoid an increase in pressure loss due to blisters occurring in the reaction gas flow passage.

It is a principal part disassembled perspective explanatory view of the stack which the fuel cell concerning this embodiment comprises. It is principal part longitudinal cross-section explanatory drawing of the stack | stuck of FIG. It is principal part block explanatory drawing of the fuel cell manufacturing apparatus which concerns on this Embodiment. It is principal part longitudinal cross-section explanatory drawing of the injection molding machine for providing a seal in the separator which comprises the stack of FIG. It is principal part longitudinal cross-section explanatory drawing which shows the state which has provided the seal | sticker using the injection molding machine of FIG. FIG. 6 is a longitudinal sectional explanatory view of a main part showing a state in which a fuel cell seal is further provided following FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stack 12 ... Anode side electrode 14 ... Cathode side electrode 16 ... Electrolyte 18 ... Electrolyte / electrode assembly 20, 22 ... Separator 24 ... Single cell 30, 34 ... Gas inlet passage 32, 36 ... Gas outlet passage 38 ... Refrigerant inlet Passage 40 ... Refrigerant outlet passage 42 ... Fuel gas passage 46 ... Oxidant gas passage 56, 58 ... Seal 60 ... Fuel cell manufacturing device 62 ... Injection molding station 64 ... Ultraviolet irradiation station 70 ... Injection molding machines 76a, 76b ... Melting Object 86, 90 ... cavity

Claims (12)

A fuel cell comprising a single cell in which an electrolyte-electrode assembly in which an anode-side electrode and a cathode-side electrode are disposed via an electrolyte is interposed between a pair of separators,
The single cell has a first separator having a first seal irradiated with ultraviolet light, and a second separator having a second seal irradiated with ultraviolet light,
A fuel cell, wherein at least a part of the first seal and the second seal are joined to each other by overlapping the first separator and the second separator.   2. The fuel cell according to claim 1, wherein a reaction gas flow path provided in the first separator and the second separator for circulating a reaction gas is provided with a seal irradiated with ultraviolet rays. 3. A fuel cell. A method for producing a fuel cell comprising a single cell in which an electrolyte-electrode assembly in which an anode electrode and a cathode electrode are disposed via an electrolyte is interposed between a first separator and a second separator Because
Providing a first seal and a second seal on the first separator and the second separator, respectively;
Irradiating the first seal and the second seal with ultraviolet rays;
By overlapping the first separator and the second separator with the electrolyte-electrode assembly interposed between the first separator and the second separator, the first seal and the second separator are overlapped. Forming at least a portion of the two seals together to form the single cell;
A method for producing a fuel cell, comprising:   4. The method of manufacturing a fuel cell according to claim 3, wherein siloxane bonds in the first seal and the second seal are dissociated by irradiation with the ultraviolet rays.   5. The method of manufacturing a fuel cell according to claim 3, wherein the wavelength of the ultraviolet light is 283 nm or less.   In the manufacturing method of any one of Claims 3-5, irradiating the said seal | sticker provided in the said 1st separator and the said 2nd separator with an ultraviolet-ray, and hydrophilizing the surface of this seal | sticker A method for manufacturing a fuel cell. 7. The method of manufacturing a fuel cell according to claim 6, wherein the ultraviolet ray has a wavelength for forming O ₂ to O ₃ and a wavelength for forming an oxygen atom in an excited state from O ₃ . Production method. 8. The method of manufacturing a fuel cell according to claim 7, wherein a wavelength for forming O ₂ to O ₃ is 185 nm or less, and a wavelength for forming an excited oxygen atom from O ₃ is 254 nm.   9. The manufacturing method according to claim 3, wherein the ultraviolet ray is also applied to a reaction gas flow path provided in the first separator and the second separator for circulating a reaction gas. Irradiation is performed, and the manufacturing method of the fuel cell characterized by the above-mentioned.   The method for manufacturing a fuel cell according to any one of claims 3 to 9, wherein the first seal and the second seal are heated. A fuel for producing a fuel cell comprising a single cell in which an electrolyte-electrode assembly in which an anode-side electrode and a cathode-side electrode are disposed via an electrolyte is interposed between a first separator and a second separator A battery manufacturing apparatus,
A seal forming mechanism for providing a first seal and a second seal on the first separator and the second separator,
An ultraviolet irradiation mechanism for irradiating the first seal and the second seal with ultraviolet rays;
An apparatus for manufacturing a fuel cell, comprising:   12. The manufacturing apparatus according to claim 11, wherein the ultraviolet irradiation mechanism includes a light source that irradiates ultraviolet rays having different wavelengths.

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