JP5330135B2 - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell which is assembled readily and easily. <P>SOLUTION: A unit cell includes a fuel cell electrode, and a separator having a fuel gas flow passage and an oxidant gas flow passage arranged so as to be in contact with an anode electrode and cathode electrode of the fuel cell electrode respectively. A fuel cell lamination is formed by laminating a plurality of unit cells, and the fuel cell is structured by fastening the fuel cell lamination integrally with fastening plates in a direction getting close to each other. The unit cell includes frame members 12, 16, 21, 22 having manifold holes respectively communicating with the fuel gas flow passage and oxidant gas flow passage of the separator on outer circumference parts of the separators 15, 20, 22 and the fuel cell electrode 11. Adhesive sheets 13, 17, 23 arranged to extend between the frame members and an entire circumference of peripheral edge parts of the fuel cell electrode and separators are integrated by respectively adhering to the fuel cell electrode 11, the separators 15, 20, 22, and the frame members 12, 16, 21, 22 with adhesives 14, 19, 18, 26, 24, 25. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a fuel cell having a structure that is simple and easy to assemble.

  A fuel cell is a device that arranges catalyst layers on both sides of an electrolyte membrane, supplies fuel gas and oxidant gas to the catalyst layers, and generates electricity by an electrochemical reaction.

  For example, in a general polymer electrolyte fuel cell, a gas diffusion layer composed of a catalyst layer made of platinum or a platinum compound and porous carbon paper is provided on both sides of a solid polymer membrane formed of an ion exchange membrane. A fuel cell stack having a structure in which a plurality of electrodes and gas impermeable separators having gas supply channels disposed on both sides thereof are stacked, and disposed at both ends of the fuel cell stack A current collector plate for conducting a current generated by a chemical reaction between the fuel and the oxidant in the fuel cell stack to the outside of the fuel cell stack, and a clamp that holds the stack members in a direction close to each other. Attached plate is installed.

  The electrode and the separator are provided with manifold holes for circulating fuel gas and oxidant gas on the outer peripheral side of the central battery reaction part, and the manifold holes are connected in a state where the respective members are laminated. A fuel gas manifold and an oxidant gas manifold are formed.

  By the way, when manufacturing a fuel cell having such a configuration, a relatively expensive material is used for the electrode member or the separator member. Therefore, the electrode member or the separator member is used as a battery reaction part in order to reduce the material cost. A relatively inexpensive resin material is integrally molded in a frame shape on the outer periphery of the electrode member or separator member, or a frame-shaped resin material divided into two in the thickness direction is joined from both sides Have been proposed (for example, Patent Documents 1 and 2).

JP 2006-172752 A Patent No. 3594345

  However, even if an inexpensive resin material is used for the outer periphery of the electrode member or the separator member, the resin material is integrally formed on the outer periphery of the electrode member or the separator member, or after the resin material having a complicated shape is molded, In the method of joining to the outer periphery of the separator member, much labor and time are required, not only the working efficiency is bad, but also economically disadvantageous.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an economically advantageous fuel cell that can be easily and easily assembled.

  To achieve the above object, the present invention provides a fuel cell electrode in which an anode electrode and a cathode electrode are disposed on both surfaces of an electrolyte membrane, respectively, and is disposed in contact with the anode electrode and the cathode electrode of the fuel cell electrode, respectively. A fuel cell stack comprising a plurality of unit cells each having a fuel gas flow path and a separator having an oxidant gas flow path, and the fuel installed by clamping means installed at both ends of the fuel cell stack. A fuel cell comprising a clamping plate for clamping a cell stack in a direction approaching each other, wherein the unit cell is a fuel gas flow path of the separator at an outer periphery of at least one of the fuel cell electrode or the separator. And a frame member having manifold holes respectively communicating with the oxidant gas flow passages, and the frame member and the fuel cell battery Alternatively, an adhesive sheet disposed across the entire periphery of the peripheral edge of the separator is bonded to and integrated with at least one of the fuel cell electrode or the separator and the frame member with an adhesive. It is structured.

  The present invention also provides a fuel cell electrode in which an anode electrode and a cathode electrode are disposed on both surfaces of an electrolyte membrane, and a fuel gas flow disposed in contact with the anode electrode and the cathode electrode of the fuel cell electrode, respectively. A fuel cell stack comprising a plurality of unit cells each having a channel and two separators having gas flow passages serving as oxidant gas flow passages, and fastening means installed at both ends of the fuel cell stack In the fuel cell comprising a clamping plate for clamping the fuel cell stack in a direction close to each other, the one separator has a first gas flow passage formed on one side and a stepped portion on the peripheral portion. The other separator has a second gas flow passage formed on one surface and a cooling water flow passage formed on the other surface. A separator with a double-sided groove having a stepped portion at the peripheral edge, and is disposed in the peripheral portion of the fuel cell electrode, and has an opening for receiving the fuel cell electrode and a manifold hole through which fuel gas, oxidant gas and cooling water flow. An electrode frame member having a single-side grooved separator frame member disposed on an outer peripheral portion of the single-sided grooved separator and having an opening in which the single-sided grooved separator is accommodated and a manifold hole through which fuel gas, oxidant gas and cooling water flow. And a double-sided grooved separator frame member disposed on the outer periphery of the double-sided grooved separator and having an opening for receiving the double-sided grooved separator and a manifold hole through which fuel gas, oxidant gas and cooling water flow, and the fuel The step part which has in the peripheral part of the separator with a single-sided groove | channel between the outer peripheral part of a battery electrode and the said electrode frame member, and the said single-sided grooved separator An adhesive sheet disposed between the frame member and a step portion provided on a peripheral edge of the double-sided grooved separator and the double-sided grooved separator frame member, and an outer periphery of the fuel cell electrode A step portion provided on a peripheral portion of the one-side grooved separator, a step portion provided on a peripheral portion of the single-side grooved separator, and a double-sided grooved separator frame member; A gas manifold of the electrode frame member, the single-side grooved separator frame member, and the double-sided grooved separator frame member, comprising a framed electrode and a framed separator integrated by bonding each of the bonding sheets with an adhesive. The hole communicates with the corresponding gas flow passage of the single-sided grooved separator and the double-sided grooved separator, and the cooling water manifold hole In this structure, the separator is connected to the cooling water flow path of the separator.

  According to the present invention, a resin material is used for the outer periphery of the electrode member or separator member, and the electrode member or separator member and the frame component installed on the outer periphery thereof are joined with an adhesive sheet. An economically advantageous fuel cell that can be easily and easily assembled can be provided.

1 is a perspective view showing a first embodiment of a fuel cell according to the present invention. The perspective view which shows the unit battery in the same embodiment. The top view which similarly shows a unit battery. (A)-(d) is sectional drawing which cut | disconnects and shows FIG. 3 along AA line, BB line, CC line, and DD line, respectively. (A)-(d) is sectional drawing which shows the state which decomposed | disassembled for every component the component in the cutting part corresponding to (a)-(d) of FIG. 4, respectively. (A), (b) is the top view which looked at the fuel cell electrode in the embodiment from the anode electrode side and the cathode electrode side. The top view which looked at the separator with a single-sided groove | channel similarly from the fuel gas groove side. (A), (b) is the top view which looked at the separator with a double-sided groove | channel similarly from the cooling water groove side and the air groove side. The top view which shows the electrode frame member in the embodiment. The top view which similarly shows the sheet | seat for electrode frame adhesion | attachment. The top view which shows the hot-melt-adhesive similarly formed in the sheet form. The top view which shows the separator frame member with a single-sided groove | channel in the same embodiment. The top view which shows the sheet-like hot-melt-adhesive similarly arrange | positioned on the upper surface of a separator frame member with a single-sided groove | channel. The top view which shows the sheet | seat for separator adhesion | attachment similarly arrange | positioned on the lower surface side of the separator frame member with a single-sided groove | channel. The top view which shows the sheet-like hot-melt-adhesive similarly arrange | positioned at the lower surface side of the separator frame member with a single-sided groove | channel. The top view which shows the separator frame member with a double-sided groove | channel in the same embodiment. The top view which shows the sheet | seat for separator adhesion | attachment similarly arrange | positioned on the lower surface side of a separator frame member with a double-sided groove | channel. The top view which shows the sheet-like hot-melt-adhesive similarly arrange | positioned at the lower surface side of the separator frame member with a double-sided groove | channel. The top view which shows the separator level difference part frame member with a double-sided groove | channel in the same embodiment. The top view which shows the sheet-like hot-melt-adhesive similarly arrange | positioned at the upper surface side of the separator level difference part frame member with a double-sided groove | channel. The top view which shows the sheet-like hot-melt-adhesive similarly arrange | positioned at the upper surface side of the separator frame member with a double-sided groove | channel. The top view which shows the sealing material provided between the lamination | stacking which a unit battery adjoins in the same embodiment. Sectional drawing which shows the state which cut | disconnected and decomposed | disassembled the component part of the unit cell in 2nd Embodiment of the fuel cell by this invention according to FIG. 3 similarly to FIG. The perspective view which shows the separator frame member with the single-sided groove | channel of the unit cell in 3rd Embodiment of the fuel cell by this invention. (A)-(d) show the component parts of the unit cell in the fuel cell according to the fourth embodiment of the present invention in the same manner as in FIG. 4 according to FIG. 3 along the lines AA, BB, CC. Sectional drawing which cuts and shows each along a DD line. (A)-(d) is sectional drawing which shows the state which decomposed | disassembled for every component the component in the cutting part corresponding to (a)-(d) of FIG.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings.

  First, the overall configuration of the fuel cell according to the present invention will be described.

  FIG. 1 is a perspective view showing a first embodiment of a fuel cell according to the present invention.

  In FIG. 1, reference numeral 100 denotes a fuel cell. The fuel cell 100 includes a fuel cell stack 2 in which a plurality of unit cells 1 are stacked, and clamping plates 3 installed at both ends in the stacking direction of the fuel cell stack 2. And the tie rods 4 that penetrate through the four corners of the clamping plate 3 in the unit cell stacking direction of the fuel cell stack 2 and integrally clamp in the direction in which the clamping plates 3 approach each other.

  In addition, a fuel pipe 5 for introducing or discharging fuel gas, cooling water, and air to and from a manifold hole installed in each unit cell 1 constituting the fuel cell stack 2 is provided at the periphery of the fastening plate 3. A cooling water pipe 6 and an air pipe 7 are installed.

Next, the configuration of the unit cell 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 to 22. FIG. 2 is a perspective view showing the unit cell 1, and FIG. 3 is an electrode of the unit cell 1 of FIG. 4A to 4D are cross-sectional views taken along lines AA, BB, CC, and DD, and FIG. FIGS. 6A to 6D are exploded views showing the respective components in the cross-sectional views of FIGS. 4A to 4D, and FIGS. 6 to 22 are FIGS. It is the top view which looked at each component of these from the upper direction.

  2 to 5, reference numeral 11 denotes a fuel cell electrode. The fuel cell electrode 11 is constituted by joining an electrolyte membrane 8 and a gas permeable anode electrode 9 and a cathode electrode 10 respectively disposed on both surfaces thereof. As shown in FIGS. 6A and 6B, gas-impermeable anode electrode edge portion 9a and cathode electrode edge portion 10a are formed on the outer peripheral portions of anode electrode 9 and cathode electrode 10, respectively.

  Reference numeral 15 denotes a single-sided grooved separator made of a gas-impermeable and conductive material disposed in contact with the anode electrode 9 of the fuel cell electrode 11. The single-sided grooved separator 15 is a single-sided groove as shown in FIG. That is, a fuel gas groove 15a is formed on the contact surface side with the anode electrode 9, and a step portion 15b is formed on the outer peripheral portion thereof corresponding to the anode electrode edge portion 9a.

  Further, reference numeral 20 denotes a double-sided grooved separator made of a gas-impermeable and conductive material disposed in contact with the surface of the single-sided grooved separator 15 opposite to the anode electrode 9 side. As shown in FIGS. 8 (a) and 8 (b), a cooling water groove 20a for circulating cooling water is formed on the surface (surface) on the contact side with the one-side grooved separator 15, and the opposite side is formed. An air groove 20b for circulating air is formed on the surface (back surface), and a stepped portion 20c is formed on the outer peripheral portion thereof corresponding to the anode electrode edge portion 9a.

  On the other hand, 12 is a frame-shaped electrode frame member made of a gas-impermeable material disposed on the outer peripheral side of the fuel cell electrode 11, and 13 is a single side corresponding to the illustrated lower surface of the electrode frame member 12 and the anode electrode edge portion 9a. An electrode frame bonding sheet disposed between the step portion 15b of the outer peripheral portion of the grooved separator 15 and between the electrode frame bonding sheet 13, the electrode frame member 12, and the anode electrode edge portion 9a. As the adhesive 14, for example, a hot melt adhesive molded into a sheet shape is disposed.

  Here, as shown in FIG. 9, the electrode frame member 12 has an opening 12a in the center, and in the frame, a fuel manifold hole 12b for flowing fuel gas, an air manifold hole 12c for flowing air, and cooling water. A cooling water manifold hole 12d that circulates through the tie rod and a tie rod through hole 12e through which the tie rod 4 is inserted are provided at the four corners.

  Further, as shown in FIGS. 10 and 11, the electrode frame bonding sheet 13 and the adhesive 14 are smaller than the opening 12a of the electrode frame member 12 only in the central opening portions 13a and 14a as compared with the electrode frame member 12, Further, it is a frame-like component having substantially the same shape as that of the electrode frame member 12 except that the opening end is formed in a size that can be inserted into the stepped portion 15b provided in the outer peripheral portion of the single-sided grooved separator 15.

  In this case, the step 15b between the outer peripheral surface of the fuel cell electrode 11 and the open end of the electrode frame member 12, the open end of the electrode frame bonding sheet 13 and the adhesive 14, and the outer peripheral portion of the single-side grooved separator 15 is formed. Even if there is a gap between the vertical surface, the fuel gas does not leak and the adhesive strength is not impaired.

  Reference numeral 16 denotes a frame-like single-sided grooved separator frame member made of a gas-impermeable material disposed on the outer peripheral side of the single-sided grooved separator 15, and 17 denotes the lower surface and double-sided groove of the single-sided grooved separator frame member 16. Separator bonding sheet disposed between the lower surface of the single-sided grooved separator 15 corresponding to the stepped portion 20c of the separator 20 with the separator, the separator-adhesive sheet 17, the single-sided grooved separator frame member 16, and the single-sided grooved For example, a hot melt adhesive molded into a sheet shape is disposed between the separator 15 and the adhesive 18.

  Here, as shown in FIG. 12, the single-side grooved separator frame member 16 has an opening 16a at the center, and the frame has a fuel manifold hole 16b through which fuel gas flows and an air manifold hole 16d through which air flows. The cooling water manifold 16d for circulating the cooling water is provided with tie rod through holes 16e for inserting the tie rods 4 at the four corners.

  The separator frame member 16 with a single-side groove has a fuel manifold hole 16b and an opening 16a by a fuel gas communication portion 16f for flowing fuel gas from the fuel manifold hole 16b to the fuel gas groove 15a of the single-side grooved separator 15. Connected, a continuous opening 16g is formed.

  Further, as shown in FIGS. 14 and 15, the separator bonding sheet 17 and the adhesive 18 have only the central openings 17 a and 18 a as compared with the single-side grooved separator frame member 16 as shown in FIGS. 14 and 15. A frame-like component having substantially the same shape as the single-side grooved separator frame member 16 except that it is smaller than the portion 16a and has an opening end that is sized to be inserted into the stepped portion 20c provided on the outer peripheral portion of the double-sided grooved separator 20 It is.

  In this case, the level difference between the outer peripheral surface of the single-side grooved separator 15 and the open end of the single-side grooved separator frame member 16, the open end of the separator bonding sheet 17 and the adhesive 18, and the outer peripheral portion of the double-sided grooved separator 20. Even if there is a gap between the vertical surface of the portion 20c, the cooling water does not leak and the adhesive strength is not impaired.

  On the other hand, the separator frame member 16 with a single-sided groove and the electrode frame bonding sheet 13 described above serve as an adhesive 19 so as to surround each of the continuous opening 16g, the air manifold hole 16c, and the cooling water manifold hole 16d. A hot melt adhesive molded in a shape as shown in FIG. 13 is disposed.

  Furthermore, 21 is a frame-shaped double-sided grooved separator frame member made of a gas-impermeable material disposed on the stepped portion 20c on the outer peripheral side of the double-sided grooved separator 20, and 22 is a stepped portion 20c of the double-sided grooved separator 20. A frame-shaped double-sided grooved separator stepped portion frame member 23 made of a gas-impermeable material and disposed on the outer peripheral side located below is a lower surface of the double-sided grooved separator frame member 21 and a double-sided grooved separator 20. A separator bonding sheet that is disposed between the step portion 20c and an adhesive 24 between the separator bonding sheet 23 and the double-sided grooved separator frame member 21, for example, a hot sheet molded into a sheet shape. A melt adhesive is placed.

  Further, an adhesive 25 is provided between the upper surface of the stepped portion 20c provided on the outer peripheral side of the double-sided grooved separator 20, the separator bonding sheet 23, and the double-sided grooved separator stepped portion frame member 22 and the double-sided grooved separator bonding sheet 23. For example, a hot melt adhesive molded into a sheet shape is disposed.

  Here, as shown in FIG. 16, the double-sided grooved separator frame member 21 has an opening 21a in the center, and in the frame, a fuel manifold hole 21b through which fuel gas flows and an air manifold hole 21c through which air flows. The cooling water manifold 21d for circulating the cooling water is provided with tie rod through holes 21e for inserting the tie rods 4 at the four corners.

  The double-sided grooved separator frame member 21 has a cooling water manifold hole 21d and an opening through a cooling water communication part 21f for circulating the cooling water from the cooling water manifold hole 21d to the cooling water groove 20a of the double-sided grooved separator 20. 21a is connected and a continuous opening 21g is formed.

  Further, as shown in FIG. 17, the separator bonding sheet 23 is a double-sided grooved separator frame member, except that the cooling water manifold hole 21d is not connected to the opening 21a by the cooling water communication part 21f as compared with the double-sided grooved separator frame member 21. 21 is a frame-like component having substantially the same shape as 21. The adhesive 24 has the same shape as the double-sided grooved separator frame member 21 as shown in FIG.

  Further, as shown in FIG. 19, the double-sided grooved separator step portion frame member 22 has an air communication portion for circulating air from the air manifold hole 21c to the air groove 20b shown in FIG. 8B of the double-sided grooved separator 20. 21h connects the air manifold hole 21c and the opening 21a to form a continuous opening 21i.

  Further, between the separator stepped frame member 22 with the double-sided groove and the separator bonding sheet 23, as shown in FIG. 20, the periphery of each of the opening 21 i, the fuel manifold hole 21 b, and the cooling water manifold hole 21 d is surrounded. As the adhesive 25, for example, a hot melt adhesive molded into a sheet shape is disposed.

  On the other hand, as shown in FIG. 21, the double-sided grooved separator frame member 21 and the above-described single-sided grooved separator bonding sheet 17 surround the periphery of the opening 21g, the fuel manifold hole 21b, and the air manifold hole 21c. As the shaped adhesive 26, for example, a hot-melt adhesive molded into a sheet shape is disposed.

  Thus, the electrode frame member 12, the single-side grooved separator frame member 16, the double-sided grooved separator frame member 21 and the double-sided grooved electrode arranged on the outer peripheral side of the fuel cell electrode 11, the single-sided grooved separator 15 and the double-sided grooved separator 20 Between the separator step portion frame members 22, the electrode frame bonding sheet 13 and sheet-like adhesives 14 and 19 on both sides thereof, the separator bonding sheet 17 and adhesives 18 and 26 on both sides thereof, for separator bonding By arranging the sheet 23 and the sheet-like adhesives 24 and 25 so as to overlap each other on the both sides thereof, the whole is bonded by heating and pressing, whereby the respective members are joined in the following state.

  That is, the entire outer periphery of the fuel cell electrode 11 is bonded to the electrode frame bonding sheet 13, and the electrode frame member 12 and the electrode frame bonding sheet 13 include the opening 12 a, the fuel manifold hole 12 b, and the air manifold hole. 12c and the cooling water manifold hole 12d are adhered by an adhesive 14 arranged so as to surround each periphery.

  In addition, the entire circumference of the outer peripheral portion of the single-side grooved separator 15 is bonded to the separator bonding sheet 17, and the single-side grooved separator frame member 16 and the separator bonding sheet 17 include an opening 16g and an air manifold hole 16c. The coolant 18 is bonded by an adhesive 18 arranged so as to surround each periphery of the manifold 16d.

  At this time, the electrode frame bonding sheet 13 and the single-sided grooved separator frame member 16 are bonded to each other by an adhesive 19 disposed so as to surround each of the opening 16g, the air manifold hole 16c, and the cooling water manifold hole 16d. Is done.

  Further, the double-sided grooved separator frame member 21 and the separator bonding sheet 23 are bonded by an adhesive 24 arranged so as to surround each of the opening 21g, the fuel manifold hole 21b, and the air manifold hole 21c. The entire circumference of the stepped portion 20c of the double-sided grooved separator 20 is bonded to the separator bonding sheet 23, and the double-sided grooved separator stepped portion frame member 22 and the separator bonding sheet 23 include an opening 21i and a fuel manifold hole 21b. The coolant 25 is bonded by an adhesive 25 arranged so as to surround each periphery of the manifold hole 21d.

  At this time, the separator bonding sheet 17 and the double-sided grooved separator frame member 21 are bonded to each other by an adhesive 25 arranged so as to surround each of the opening 21g, the fuel manifold hole 21b, and the air manifold hole 21c. .

  When stacking a plurality of unit cells 1 assembled in this way, it is necessary to seal between adjacent unit cells 1, and therefore a sealing material 27 is provided between adjacent stacks of unit cells 1.

  As shown in FIG. 22, the sealing material 27 is a frame-like component having an opening 27a at the center. The frame 27 has a fuel manifold hole 27b through which fuel gas flows and an air manifold hole 27c through which air flows. A cooling water manifold hole 27d through which the cooling water flows and a tie rod through hole 27e for inserting the tie rod 4 are provided at the four corners.

  Next, the operation of the fuel cell according to the first embodiment configured as described above will be described.

  In the first embodiment, the fuel gas introduced from one fuel pipe 5 of the clamping plate 3 circulates in the fuel manifold hole of each member of the unit cell 1, and one fuel of the separator frame member 16 with a single-side groove. After being introduced into the fuel gas groove 15a of the single-sided grooved separator 15 via the gas connecting portion 16f and consumed by the anode electrode 9 of the fuel cell electrode 11, the unused fuel gas and components other than fuel in the fuel gas Is discharged from the other fuel pipe 5 of the fastening plate 3 via the other fuel gas communication portion 16f of the separator frame member 16 having a single-side groove.

  At this time, in each member of the unit cell 1 excluding the single-sided grooved separator frame member 16 and the adhesive 19 and the adhesive 18, the periphery of the fuel manifold hole is sealed by an adhesive or a sealing material between adjacent members. Therefore, the fuel gas does not enter the space other than the fuel gas communication portion 16f of the separator frame member 16 with the groove on one side from the fuel manifold hole.

  In addition, the fuel gas introduced into the fuel gas groove 15a of the single-sided grooved separator 15 enters the gap between the single-sided grooved separator 15 and the single-sided grooved separator frame member 16, but the separator bonding sheet 17 and the single-sided grooved separator 15 Are sealed by the adhesive 18, it is possible to prevent the fuel gas from leaking to the cooling water groove 20 a side of the separator 20 with the double-sided groove.

  Similarly, since the fuel gas introduced into the fuel gas groove 15a of the single-sided grooved separator 15 is sealed by the anode electrode edge 9a of the fuel cell electrode 11, the adhesive 14, and the electrode frame bonding sheet 13, the fuel cell. It is possible to prevent leakage to the fuel cell electrode 11 side through the outer periphery of the electrode 11.

  Similarly, the air introduced into the air manifold hole and the cooling water introduced into the cooling water manifold are sealed by the respective members and the adhesive between the members, and can be prevented from leaking to different systems.

  Thus, in 1st Embodiment, as shown in FIGS. 7-22, each remove | excluding the fuel cell electrode 11, the single-sided grooved separator 15, and the double-sided grooved separator 20 among the members used for the unit cell 1. This member has a uniform shape in the thickness direction, and can be easily manufactured by a cutting process such as punching from a plate-like or sheet-like material. Further, each frame member and the adhesive sheet can be easily manufactured even by mold processing in which a resin material is poured into a mold prepared in advance. However, since the shape is relatively simple at this time, the manufacturing is easy.

  Further, in the first embodiment, since the respective adhesive sheets can be formed in the same shape, it is not necessary to use a plurality of production equipment, and the production is simple and easy.

  In addition, using hot melt adhesive molded into a sheet as an adhesive, each adhesive sheet, separator component or electrode component, and each frame member are overlaid in a predetermined arrangement, and the whole is thermocompression bonded Therefore, the joining of each member can be performed easily and easily.

  In the above embodiment, the members are bonded together by hot-pressing the entire sheet using a hot-melt adhesive formed into a sheet shape between the adhesive sheet, the separator component or the electrode component, and each frame member. However, when it is difficult to superimpose these in a stable state, the whole may be thermocompression-bonded in a state where the members are temporarily bonded with an adhesive resin.

(Second Embodiment)
FIG. 23 is a sectional view showing a state in which the constituent parts of the unit cell in the second embodiment of the fuel cell according to the present invention are cut and disassembled according to FIG. 3 in the same manner as FIG. A description thereof will be omitted.

  In the second embodiment, as shown in FIG. 23, after forming an adhesive layer such as polyester on both surfaces of a base material such as polyethylene terephthalate supplied as a sheet or roll material, the base material and the adhesive layer are simultaneously formed. A unit battery is configured by manufacturing a bonding sheet with an adhesive having a predetermined shape by cutting and bonding the adhesive sheet with an adhesive and each member.

  The difference between the present embodiment and the first embodiment is that the adhesive 14 and the adhesive 19, the adhesive 18 and the adhesive 26, and the adhesive 24 and the adhesive 25 are obtained by simultaneously cutting the adhesive sheet and the adhesive. Is the same shape as the adhesive sheet with adhesive, and a part of the adhesive is exposed to the gas or cooling water flow passage.

  In general, in a fuel cell, cell characteristics tend to be deteriorated due to external impurities mixed into the fuel cell reaction part. Therefore, it is desirable to use a material with less impurity elution as an adhesive.

  Next, the operation of the fuel cell in the second embodiment configured as described above will be described.

  In the second embodiment, as in the first embodiment, the fuel gas introduced into the fuel manifold hole, the air introduced into the air manifold hole, and the cooling water introduced into the cooling water manifold are the respective members and members. Since it is sealed with an adhesive in between, it is possible to prevent leakage into different systems.

  Thus, in 2nd Embodiment, after forming an adhesive layer on both surfaces of the base material supplied as a sheet form or a roll material, a base material and an adhesive layer are cut simultaneously, and adhesive of a predetermined shape is attached. Since the adhesive sheet is manufactured, the labor and time required for the manufacturing can be greatly reduced.

  Moreover, in this embodiment, since the adhesive sheets with adhesives can all have the same shape, it is not necessary to use a plurality of manufacturing equipment for manufacturing, and manufacturing is easy.

  Further, similarly to the first embodiment, each frame component can also be easily manufactured by cutting or molding such as punching from a plate-like or sheet-like material.

  Moreover, each member can be easily joined by overlapping and bonding each adhesive sheet with an adhesive, a separator component or an electrode component, and each frame member in a predetermined arrangement.

  As described above, in this embodiment, the unit battery can be assembled easily and easily, and the workability can be improved.

(Third embodiment)
FIG. 24 is a perspective view showing a separator frame member with a single-side groove of a unit cell in a third embodiment of the fuel cell according to the present invention.

  In the third embodiment, instead of the single-side grooved separator frame member 16 of the first embodiment, a single-sided grooved separator frame member 28 as shown in FIG. 24 is arranged. This is the same as the embodiment.

  The single-sided grooved separator frame member 28 of the present embodiment is a frame-like component having an opening 28a at the center in the same manner as the single-sided grooved separator frame member 16 of the first embodiment. A manifold hole 28b for circulating air, an air manifold hole 28c for circulating air, a cooling water manifold 28d for circulating cooling water, and tie rod through holes 28e for inserting the tie rods 4 are provided at the four corners. A fuel gas communication portion 28f for allowing the fuel gas to flow from the fuel manifold hole 28b to the fuel gas groove 15a of the separator 15 with the single-side groove is a fuel gas communication portion molded on one side of the separator frame member 28 with the single-side groove. The upper surface of the rib of the communication groove of the fuel gas communication portion 28f is formed so as to be in contact with the adjacent electrode frame bonding sheet 13.

  Next, the operation of the fuel cell according to the third embodiment configured as described above will be described.

  In the third embodiment, as in the first embodiment, the fuel gas introduced into the fuel manifold hole, the air introduced into the air manifold hole, and the cooling water introduced into the cooling water manifold are separated from each other and between the members. Therefore, it is possible to prevent leakage into different systems.

  Further, the upper surface of the rib of the communication groove of the fuel gas communication portion 28f is formed so as to be in contact with the adjacent electrode frame bonding sheet 13, so that the electrode frame bonding sheet 13 is separated from the electrode frame member 12 and the single-side grooved separator frame. The electrode frame bonding sheet 13 sandwiched between the members 28 and bonded to the electrode frame member 12 with the adhesive 14 can be prevented from peeling off from the electrode frame member 12.

  As described above, in the third embodiment, the unit battery can be assembled easily and easily, the peeling of the electrode frame bonding sheet 13 and the electrode frame member 12 is prevented, and the reliability is high in long-term operation. It can be done.

(Fourth embodiment)
25 (a) to 25 (d) show the components of the unit cell in the fourth embodiment of the fuel cell according to the present invention in the same manner as in FIG. 4, according to FIG. 3, along the lines AA, BB, C- Sectional drawing which cuts and shows each along a C line and a DD line, FIG.26 (a)-(d) shows the component in the cutting part corresponding to (a)-(d) of FIG. FIG. 5 is a cross-sectional view showing an exploded state, and the same components as those in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof is omitted.

  In the fourth embodiment, as shown in FIGS. 25 and 26 (a) to (d), a double-sided grooved separator made of a gas-impermeable and conductive material in contact with the anode electrode 9 of the fuel cell electrode 11 30 and the single-sided grooved separator 31 made of a gas-impermeable and conductive material is placed in contact with the opposite surface of the double-sided grooved separator 30 to the anode electrode 9 side. is there.

  This double-sided grooved separator 30 forms a fuel gas groove 30a on the contact surface side with the anode electrode 9, and a cooling water groove 30b for circulating cooling water on the surface on the contact side with the single-sided grooved separator 31. An upward stepped portion 30c and a downward stepped portion 30d are formed on the outer peripheral portion corresponding to the anode electrode edge portion 9a.

  The single-sided grooved separator 31 is formed with an air groove 31 a for circulating air on the surface opposite to the contact surface with the double-sided grooved separator 30.

  On the other hand, the electrode frame member 12 disposed on the outer peripheral side of the fuel cell electrode 11, the separator frame member 16 disposed on the outer peripheral side corresponding to the fuel gas groove 30a of the double-sided grooved separator 30, and the outer periphery corresponding to the cooling water groove 30b. The separator frame member 26 arranged on the side and the separator step portion frame member 22 arranged on the outer peripheral side corresponding to the air groove of the single-side grooved separator 31 are the same as those in the first embodiment, and these frame members The structure of adhering the fuel cell electrode 11 to the edge portion of the fuel cell electrode 11 and each separator with an adhesive is the same as that of the above-described embodiment.

  As described above, even when the double-sided grooved separator and the single-sided grooved separator are arranged opposite to those of the first embodiment, the same effects as those described above can be obtained.

  The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

  For example, in the unit cell 1 of the first embodiment, the fuel cell electrode 11 is disposed on one side, and the separator 20 with a double-sided groove is disposed on the opposite side, and a plurality of unit cells 1 are interposed via the sealing material 27. The unit cell is configured by disposing the double-sided grooved separator 20 on one side and the single-sided grooved separator 15 on the other side with the fuel cell electrode 11 in between. It is also possible to laminate the frame parts of the double-sided grooved separator 20 and the single-sided grooved separator 15 via a sealing material.

  In each of the above-described embodiments, the configuration in which the adhesive is provided on both sides of the adhesive sheet between the electrode frame member 12, the separator frame member 16, the double-sided separator frame member 21, and the separator step portion frame member 22 has been described. Instead of the adhesive provided between any of these arbitrary frame members, an elastic sealing material may be provided.

  Further, as a shape of the sealing material, a groove having a semicircular cross section may be provided on the lower surface on the frame member side, and an O-ring sealing material may be fitted into this groove.

  In the third embodiment described above, the fuel gas communication groove 28f for allowing the fuel gas to flow is provided on one side of the separator frame member 28 with the single-side groove. However, the communication between the opening of the frame part and the air manifold hole is provided. It is also possible to adopt a configuration in which the rib surface is in contact with an adjacent member, with the connecting portion between the opening of the part and the frame part and the cooling water manifold hole as a communication groove.

  Furthermore, one or two members of the fuel cell electrode 11, the single-sided grooved separator 15 and the double-sided grooved separator 20 are sized to include a portion corresponding to the frame member, and the portion corresponding to the frame member is fueled and cooled. It is also possible to adopt a configuration in which the frame member is not provided by providing manifold holes for water and air.

  DESCRIPTION OF SYMBOLS 1 ... Unit cell, 2 ... Fuel cell laminated body, 3 ... Fastening plate, 4 ... Tie rod, 5 ... Fuel piping, 6 ... Cooling water piping, 7 ... Air piping, 8 ... Electrolyte membrane, 9 ... Anode electrode, 9a ... Anode electrode edge portion, 10 ... cathode electrode, 10a ... cathode electrode edge portion, 11 ... fuel cell electrode, 12 ... electrode frame member, 12a ... opening, 12b ... fuel manifold hole, 12c ... air manifold hole, 12d ... cooling water Manifold hole, 12e ... Tie rod through hole, 13 ... Electrode frame bonding sheet, 14, 18, 19, 24, 25, 26 ... Adhesive, 15 ... Single-sided grooved separator, 15a ... Fuel gas groove, 15b ... Stepped portion, 16 ... Separator frame member with groove on one side, 16a ... Opening, 16b ... Fuel manifold hole, 16c ... Air manifold hole, 16d ... Cooling water manifold hole, 16e ... Tie rod through hole, 6g: continuous openings, 17, 23 ... separator bonding sheet, 20 ... double-sided grooved separator, 20a ... cooling water groove, 20b ... air groove, 20c ... stepped portion, 21 ... double-sided grooved separator frame member, 21a ... Opening part, 21b ... Fuel manifold hole, 21c ... Air manifold hole, 21d ... Cooling water manifold hole, 21e ... Tie rod through hole, 21f ... Cooling water communication part, 21g ... Continuous opening part, 21h ... Air communication part, 21i ... Continuous opening, 22: separator stepped frame member with groove on both sides, 27: sealing material, 27a ... opening, 27b ... fuel manifold hole, 27c ... air manifold hole, 27d ... cooling water manifold hole, 27e ... tie rod through hole 28 ... Separator frame member with groove on one side, 28a ... Opening, 28b ... Fuel manifold hole, 28c ... Air manifold hole, 2 d ... Cooling water manifold hole, 28e ... Tie rod through hole, 28f ... Fuel gas communication part, 30 ... Double-side grooved separator, 31 ... Single-sided grooved separator, 30a ... Fuel gas groove, 30b ... Cooling water groove, 30c ... Upward step Part, 30d ... downward step part, 31 ... single-sided grooved separator, 31a ... air groove

Claims (6)

A fuel cell electrode in which an anode electrode and a cathode electrode are respectively disposed on both surfaces of the electrolyte membrane, and a fuel gas flow path and an oxidant gas flow channel disposed in contact with the anode electrode and the cathode electrode of the fuel cell electrode, respectively A fuel cell stack formed by stacking a plurality of unit cells each having a separator having a path, and tightening the fuel cell stack in a direction approaching each other by fastening means installed at both ends of the fuel cell stack A fuel cell comprising a clamping plate for
In the unit cell, a frame member having manifold holes communicating with the fuel gas flow path and the oxidant gas flow path of the separator is disposed on at least one outer peripheral portion of the fuel cell electrode or the separator, and the frame member and An adhesive sheet disposed between the fuel cell electrode or the entire periphery of the peripheral edge of the separator is bonded to at least one of the fuel cell electrode or the separator and the frame member with an adhesive. A fuel cell characterized by being integrated.   2. The fuel cell according to claim 1, wherein the separator is constituted by two separators, one of which is a single-sided grooved separator having a first gas flow passage on one side, and the other is a second side on one side. A fuel cell comprising a double-sided grooved separator having a gas flow passage and a cooling water flow passage on the other surface.   3. The fuel cell according to claim 1, wherein the adhesive sheet is disposed so as to straddle between the frame member and a stepped portion formed on a peripheral edge portion of the separator. battery. A fuel cell electrode in which an anode electrode and a cathode electrode are disposed on both surfaces of the electrolyte membrane, a fuel gas flow passage disposed in contact with the anode electrode and the cathode electrode of the fuel cell electrode, and an oxidant gas flow, respectively. A fuel cell stack comprising a plurality of unit cells each having two gas separators having gas flow passages, and the fuel cell stack by clamping means installed at both ends of the fuel cell stack In a fuel cell composed of a clamping plate for clamping in a direction close to each other,
The one separator is a single-sided grooved separator having a first gas flow passage on one side and a stepped portion on the peripheral edge, and the second separator has a second gas flow passage on one side. And a double-sided grooved separator having a cooling water flow passage formed on the other surface and a stepped portion on the peripheral edge,
An electrode frame member disposed on the outer periphery of the fuel cell electrode, and having an opening for receiving the fuel cell electrode and a manifold hole through which fuel gas, oxidant gas and cooling water flow;
A single-sided grooved separator frame member disposed on the outer peripheral portion of the single-sided grooved separator and having a manifold hole through which fuel gas, oxidant gas, and cooling water flow, and an opening for receiving the single-sided grooved separator;
A separator frame member with a double-sided groove that is disposed on the outer periphery of the separator with a double-sided groove and has a manifold hole through which the separator with the double-sided groove fits and a fuel gas, an oxidant gas, and cooling water flow;
Between the outer periphery of the fuel cell electrode and the electrode frame member, between the stepped portion on the peripheral edge of the single-side grooved separator and the separator frame member with single-side groove and on the peripheral edge of the double-sided grooved separator. An adhesive sheet disposed between the stepped portion and the separator grooved member with a groove on both sides,
The outer peripheral part of the fuel cell electrode, the electrode frame member, the step part provided at the peripheral part of the separator with the single-side groove, the step part provided at the peripheral part of the separator frame member with the single-side groove and the double-sided groove and the double-sided groove A separator electrode with a frame and a separator with a frame, which are integrated by adhering a separator frame member with each adhesive sheet with an adhesive,
Gas manifold holes of the electrode frame member, the separator frame member with a single-sided groove, and a separator frame member with a double-sided groove communicate with the corresponding gas flow passages of the separator with a single-sided groove and the separator with a double-sided groove, and a cooling water manifold hole Is in communication with the cooling water flow passage of the separator with groove on both sides.   5. The fuel cell according to claim 1, wherein the adhesive used for bonding the adhesive sheet and a member adjacent thereto is a hot-melt adhesive molded into a sheet shape. 6. The fuel cell characterized by the above-mentioned.   5. The fuel cell according to claim 1, wherein an adhesive used for bonding the adhesive sheet and a member adjacent thereto is formed in advance on one or both sides of a sheet base material. A fuel cell comprising an adhesive layer.

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