JP2009037834A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress slippage of a separator and a membrane electrode assembly in a fuel cell and achieve thinness and light weight reduction. <P>SOLUTION: An insulating cell plate 230 of a fuel battery cell 210 is provided with an MEA 232 and porous gas diffusion layers 250, 252 joined to this in the center, and is jointed to a separator 270 interposing a seal plate 260 in between. The cell plate 230 has a center bent member 240C, a left bent member 240L, and a right bent member 240R at the upper and lower ends, and these bent members are jointed and fixed to the bent members of the neighboring cell plate 230 with the bent members extended to the further outside than the outer fringe of the separator 270. Thereby, the neighboring cell plates 230 surround the separator 270 on the outer fringe of the separator by each bent members of the one side cell plate 230 and respective bent members of the cell plate 230 on the other side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell in which a cell plate including a membrane electrode assembly in which electrodes are bonded to both sides of an electrolyte membrane and a separator having a flow path for a reaction gas supplied to the membrane electrode assembly are stacked.

  In such a fuel cell, since the separator is also used for collecting power of a so-called fuel cell using a membrane electrode assembly as a power generation unit, it is indispensable to avoid a short circuit between adjacent separators. It has been proposed (for example, Patent Document 1). In this patent document, it has been proposed that an insulating member for avoiding a short circuit of the separator is arranged on the separator end side separately from a sealing member (gasket) for securing a seal of the membrane electrode assembly.

  On the other hand, since the fuel cell is also a stack of fuel cells, the state of cell stacking, specifically, the shift between adjacent fuel cells, or the shift between the separator and the membrane electrode assembly constituting the fuel cell, etc. It is also essential to suppress this. For this reason, a shaft is disposed between the end plates at both ends of the fuel cell, both of which are tightened with bolts and nuts, and the above-described deviation is suppressed by this tightening (for example, Patent Document 2).

JP 2002-352817 A JP 2006-302900 A

  In recent years, even fuel cells have been required to be reduced in size, specifically thinner and lighter. Thus, not only the separator itself but also the short circuit of the separator as proposed in Patent Document 1 is required. It has been desired to omit the insulating member only for avoidance.

  In view of the above-described problems, an object of the present invention is to achieve a reduction in thickness and weight in a fuel cell.

  In order to achieve at least a part of the above object, the present invention adopts the following configuration.

[Application: Fuel cell]
A fuel cell in which an insulating cell plate having a membrane electrode assembly in which electrodes are bonded to both sides of an electrolyte membrane, and a separator having a flow path for a reaction gas supplied to the membrane electrode assembly,
The cell plate includes an extending piece extending outside the outer edge of the separator,
The adjacent cell plates surround the separator on the outer edge side of the separator with the extended piece portion of the cell plate on one side and the extended piece portion of the cell plate on the other side. The gist.

  Since the fuel cell having the above-described configuration is formed by laminating a cell plate and a separator, when attention is paid to a certain separator, the separator is sandwiched between the cell plates on both sides thereof. The cell plates on both sides of the separator are adjacent to each other, and the extending piece portions of the cell plates extend outward from the outer edge of the separator. The extending piece portion of the cell plate on one side and the other side And the extended piece portion of the cell plate surrounds the separator on the outer edge side of the separator. For this reason, since each laminated | stacked separator is each surrounded by the extension piece part of the cell plate of the both sides, a contact with an adjacent separator can be avoided. In addition, a separate member for avoiding such contact of the separator is not required. There are also the following advantages.

  When any external force is applied to the cell stack that has been fastened as described above with the shaft and the bolts and nuts from the direction intersecting the cell stacking direction, the shaft between the end plates may be bent. In such a case, there is a concern that the membrane electrode assembly and the separator in each fuel cell may be displaced. However, in the fuel cell having the above-described configuration, the separator is surrounded by the extended piece of the cell plate at the outer edge thereof, so that the deviation between the cell plate provided with the membrane electrode assembly and the separator, that is, the membrane electrode assembly and the separator is shifted. , It can be individually suppressed for each separator. For this reason, it is useful for avoiding problems caused by such deviation in the fuel cell, for example, damage to the membrane electrode assembly and deterioration of battery performance based on this.

  The fuel cell described above can be configured as follows. For example, when surrounding the separator by the extended piece portion of the adjacent cell plate, the separator is surrounded by the extended piece portion at the outer edge side at one end of the separator and the outer edge side at the other end. it can. In this way, contact with adjacent separators can be avoided on both sides of the one end and the other end of the separator, and the effectiveness of suppressing displacement between the membrane electrode assembly and the separator is enhanced.

  The adjacent cell plates may be bent and continuous on the outer edge side at one end of the separator, and the continuous part may be the extended piece portion on the one outer edge side. . By doing so, it is easy to suppress the deviation between the membrane electrode assembly and the separator.

  Further, when surrounding the separator by the extended piece portion of the adjacent cell plate, the extended piece portion for each cell plate is bonded and fixed so that the pressing force along the stacking direction of the cell plates is exerted on the separator. You can also. In this way, the displacement between the membrane electrode assembly and the separator can be suppressed with higher effectiveness, and the fastening force when fastening the fuel cell along the stacking direction can be determined by the amount of pressing force exerted on the separator by the adjacent cell plate. Can only be small. Therefore, it is possible to promote a reduction in the diameter of bolts and nuts for fastening the fuel cell, and hence a reduction in weight.

  Hereinafter, embodiments of the present invention will be described based on examples. FIG. 1 is a perspective view schematically showing an overall configuration of a fuel cell 100 as an embodiment of the present invention, and FIG. 2 is an explanatory diagram schematically showing a state in which the fuel cell 100 is cut along a section AA in FIG. FIG. 3 is an explanatory view showing a state of stacking cells while disassembling and showing the fuel battery cell 210 constituting the fuel battery 100, and FIG. 4 is an explanatory view showing a state of forming a cell plate 230 included in the fuel battery cell 210. is there.

  As shown in these drawings, the fuel cell 100 fastens the cell stack 200 along the stacking direction. The cell stack 200 includes a plurality of fuel cells 210 stacked, and includes terminal plates 202 for current collection at both ends thereof. And this cell laminated body 200 is clamped by the end plate 110 of both ends, and is fastened by the shaft 112 and the volt | bolt 114 between end plates. The fuel cell 100 includes a solid polymer electrolyte membrane in each fuel cell 210 and receives supply of a fuel gas containing hydrogen and an oxidizing gas (air) containing oxygen. For such gas supply, the end plate 110 includes an air introduction manifold 120i and an air exhaust manifold 120o, a hydrogen introduction manifold 122i and a hydrogen exhaust manifold 122o, a cooling water introduction manifold 124i, and a cooling water discharge manifold 124o. The terminal plate 202 of the cell stack 200 and the fuel cell 210 have flow paths corresponding to these manifolds, and hydrogen gas and air reach the anode and cathode of each fuel cell 210 and are subjected to an electrochemical reaction. The fuel cell 210 generates power.

  As described above, the fuel cell 100 is fastened by the shaft 112 and the bolts 114 as well as the cell stack 200, and each fuel cell 210 is divided into the center gripping portion 220C, the left and right left gripping portions 220L and the right side. Fastening is also performed with the gripping portion 220R. Further, the terminal plate 202 and the end plate 110 are also fastened at the center gripping portion 220CE. Hereinafter, the structure of these holding | gripping parts and the structure of each fuel battery cell are demonstrated using FIGS.

  First, the fuel cell 210 will be described. As shown in FIG. 3, the fuel cell 210 includes an insulating cell plate 230, a seal plate 260, and a separator 270 as constituent members. In the cell stack 200, a plurality of the fuel cells 210 are arranged. Laminated. The cell plate 230 includes a membrane electrode assembly (MEA) 232 in the center, and porous gas diffusion layers 250 and 252 are bonded to both sides of the cell plate 230. The MEA 232 serves as a gas / cooling water flow path. Are provided with an air introduction hole 233i and an air exhaust hole 233o, a hydrogen introduction hole 234i and a hydrogen exhaust hole 234o, a cooling water introduction hole 235i and a cooling water discharge hole 235o. These communicate with the aforementioned manifold of the end plate 110.

  The cell plate 230 includes a center bent piece 240C, a left bent piece 240L, and a right bent piece 240R at upper and lower ends thereof. As shown in FIG. 4, these bent pieces are formed by bending at the slits S formed at the upper and lower ends of the flat cell plate 230, and at the upper end side, the center bent piece 240C is on the near side, The left bent piece 240L and the right bent piece 240R face the back side, and on the lower end side, the center bent piece 240C faces the back side, and the left bent piece 240L and the right bent piece 240R face the near side. Yes. In this case, since the flat plate-like region shape of the cell plate 230 excluding these bent pieces is the same as the separator 270 described later, each of the bent pieces described above extends outward from the outer edge of the separator 270. .

  For this reason, in the cell stack state shown in FIG. 2 or FIG. 3, the cell plate 230 in the adjacent fuel cell 210 has a center bent piece 240C in which the cell plate 230 on one side faces the front side on the upper end side. The cell plate 230 on the other side is joined to the center bent piece 240C facing the back side at the upper end side, and the left bent piece 240L and the right bent piece 240R are also joined on both sides of the center bent piece 240C. These bent pieces are fixed by heat fusion, an adhesive, or the like at the joining portion, and after this joining and fixing, the center gripping portion 220C, the left gripping portion 220L, and the right gripping portion 220R are formed. Since the plate-like region shape of the cell plate 230 excluding the bent pieces is the same as that of the separator 270 as described above, the adjacent cells as in the cell stacking state shown in FIGS. The plate 230 surrounds the separator 270 on the outer edge side of the separator with the bent pieces of the cell plate 230 on one side and the bent pieces of the cell plate 230 on the other side.

  When manufacturing the cell plate 230, first, a flat plate cell plate 230 having only the MEA 232 electrolyte membrane is prepared, and an electrode is formed by applying and drying an electrode forming paste on both surfaces of the electrolyte membrane. To do. As a result, the plate-like cell plate 230 having the MEA 232 at the center is obtained. Next, in this state, as described above, each of the bent pieces is formed by bending the slit S as a boundary, and then the gas diffusion layer 250 and the gas diffusion layer 252 are bonded to the MEA 232 by hot pressing. Alternatively, the gas diffusion layer 250 and the gas diffusion layer 252 may be bonded to the MEA 232 first by hot pressing, and then bent at the slit S to form each of the bent pieces. Alternatively, in the cell plate 230 in which the bent piece has been formed, electrode formation and gas diffusion layer formation by hot pressing can also be performed.

  The seal plate 260 is formed of an insulating resin that exhibits a sealing function. The seal plate 260 is sandwiched between the cell plate 230 and the separator 270 having the above-described configuration, more specifically, the flat plate-like region of the cell plate 230 and the separator 270, and gas / cooling is performed. Performs a water sealing function. That is, the seal plate 260 has an air introduction hole 262i, an air exhaust hole 262o, a hydrogen introduction hole 263i, a hydrogen introduction hole 263i connected to the introduction hole / exhaust hole of the cell plate 230 around the window 261 surrounding the gas diffusion layers 250, 252. The exhaust hole 263o, the cooling water introduction hole 264i, and the cooling water discharge hole 264o are provided, and the fluid (gas / cooling water) passing through these holes is sealed.

  As shown in FIG. 3, the seal plate 260 is formed by joining three plates, and serves to supply gas to the gas diffusion layers 250 and 252 of the fuel cell 210 and to collect current in each cell. The separator 270 includes an air introduction hole 271i, an air exhaust hole 271o, a hydrogen introduction hole 272i, a hydrogen exhaust hole 272o, a cooling water introduction hole 273i, a cooling water discharge, which are connected to the introduction holes / exhaust holes of the cell plate 230 and the seal plate 260. A hole 273o is provided. In the separator 270 on the right side in FIG. 3, the air passing through the air introduction hole 271 i is supplied to the gas diffusion layer 250, and the separator 270 arranged with the separator and the cell plate 230 interposed therebetween has the cooling water introduction hole. Hydrogen passing through 273 i is supplied to the gas diffusion layer 252. Thereby, the MEA 232 of the cell plate 230 generates power because it receives supply of hydrogen (hydrogen gas) and oxygen (air) from both sides thereof.

  In the present embodiment, the terminal plate 202 and the end plate 110 are also surrounded by the same method as the cell plate 230 described above. That is, as shown in FIG. 2, a cell plate 230S corresponding to the terminal plate 202 and a cell plate 230E corresponding to the end plate 110 are provided, and even if the cell plate 230S and the cell plate 230E exist, the cell plate 230 Similarly, a center bent piece 240C, a left bent piece 240L, and a right bent piece 240R are provided. A seal plate 260E was disposed between the terminal plate 202 and the adjacent fuel cell 210 and between the terminal plate 202 and the end plate 110 to achieve sealing. This seal plate 260E is the same as the seal plate 260 except that the window 261 is not provided.

  In order to stack the fuel battery cells 210 having the above-described configuration to form the cell stack 200, and thus the fuel battery 100, the above-described bent pieces of the respective cell plates 230 having the adjacent fuel battery cells 210 are bonded and fixed. However, the fuel cells 210 are sequentially stacked. Alternatively, the fuel battery cells 210 are stacked as many as the number of stacks in the cell stack 200, and then the joint portions of the bent pieces are joined and fixed. Thereafter, the fuel cell 100 is obtained by arranging the shaft 112 between both end plates and tightening the shaft 112 with the bolts 114.

  In this embodiment, the bending state of the center bent piece 240C, the left bent piece 240L, and the right bent piece 240R is as follows. In FIG. 2, the center bent pieces 240 </ b> C, the left bent pieces 240 </ b> L, and the right bent pieces 240 </ b> R of the adjacent cell plates 230 are joined together. A state in which the bending piece is bonded and fixed after the body 200 is pressed in the cell stacking direction is shown. However, in this embodiment, when the fuel cells 210 are stacked and not pressed, between the center bent pieces 240C, the left bent pieces 240L, and the right bent pieces 240R in the adjacent cell plates 230. In the meantime, the degree of bending of each of the bent pieces was defined so that a gap corresponding to the shrinkage allowance due to the pressing of the cell stack 200 was opened. Then, in a state where there is a gap between the bent pieces, the cell stack 200 is pressed from the stacking direction to join the center bent pieces 240C, the left bent pieces 240L, and the right bent pieces 240R, Thus, the bent piece joining portion was joined and fixed to form the central gripping portion 220C, the left gripping portion 220L, and the right gripping portion 220R. Therefore, the cell plate 230 of the fuel battery cell 210 is fixed to the adjacent cell plate 230 by each bent piece in a state in which the pressing force in the cell stacking direction is exerted on the separator 270.

  As described above, in the fuel cell 100 of the present embodiment, when the fuel cell 210 is stacked to form the cell stacked body 200, the center bends that the cell plates 230 of the adjacent fuel cells 210 have at their upper and lower ends, respectively. The pieces 240C, the left bent pieces 240L, and the right bent pieces 240R are joined and fixed to form the center gripping portion 220C, the left gripping portion 220L, and the right gripping portion 220R. Then, as shown in FIGS. 1 to 3, these gripping portions are formed above and below the fuel battery cell 210, and the adjacent fuel battery cells 210 are fixed by the gripping portions. In addition, the cell plates 230 of the adjacent fuel cells 210 have the center bent piece 240C, the left bent piece 240L, and the right bent piece 240R at the upper and lower ends, which are joined and fixed, extended outward from the outer edge of the separator 270, The separator 270 is surrounded on the outer edge side of the separator by the bent pieces that are bonded and fixed. For this reason, the separators 270 in each of the stacked fuel cells 210 are surrounded by the bent pieces of the cell plates 230 on both sides thereof, so that they do not come into contact with the adjacent separators 270. Moreover, in order to avoid such contact of the separator 270, only a member (cell plate 230) essential for the configuration of the fuel cell 210, which is the cell plate 230 having the MEA 232, is used, and another member for avoiding contact with the separator is used. do not need. Further, since the separator 270 is surrounded at the upper and lower outer edges, the deviation between the cell plate 230 including the MEA 232 and the separator 270, that is, the MEA 232 and the separator 270, can be individually suppressed for each separator 270 and for each fuel cell 210. .

  In this embodiment, since the outer periphery of the separator 270 is surrounded by the upper and lower ends of the separator, contact with the adjacent separator 270 can be avoided at the upper and lower ends of the separator. In addition, the displacement between the MEA 232 and the separator 270 can be suppressed with high effectiveness. For example, when the fuel cell 100 is mounted on the vehicle or the like, the direction in which the separator 270 and the MEA 232 in the fuel cell 210 are displaced by some impact is often the vehicle front-rear direction. Therefore, when the fuel cell 100 shown in FIG. 1 is mounted on the vehicle so that the upper and lower ends in the drawing are in the vehicle front-rear direction, the displacement between the MEA 232 and the separator 270 when an impact is applied from the vehicle front-rear direction can be effectively suppressed.

  Further, in the present embodiment, when the separator 270 is surrounded by the center bent piece 240C or the like of the cell plate 230 of the adjacent fuel cell 210, the center bent piece 240C, the left bent piece 240L, and the right bent are joined and fixed. The adjacent cell plates 230 having the pieces 240R exert a pressing force in the cell stacking direction on the separator 270 as described above. For this reason, the displacement between the MEA 232 and the separator 270 can be suppressed with higher effectiveness, and the fastening force when the fuel cell 100, that is, the cell stack 200 is fastened along the stacking direction is determined by the adjacent cell plate 230 by the separator 270. Can be reduced by the amount of pressing force exerted on the surface. Therefore, it is preferable because the diameter of the bolt 114 and the shaft 112 for fastening the fuel cell can be reduced and the weight can be reduced.

  Next, another embodiment will be described. The fuel cell 300 of this embodiment is characterized in that the cell plate surrounding the separator 270 in the stacked fuel cell 210 is formed from a single plate. FIG. 5 is a perspective view schematically showing an overall configuration of a fuel cell 300 as another embodiment, and FIG. 6 is an explanatory view schematically showing a state in which the fuel cell 300 is cut along a BB section in FIG. 7 is an explanatory view showing the shape of the cell plate 310 constituting the fuel battery cell 210 of the fuel cell 300 and how it is formed, and FIG. 8 is an explanatory view showing how the fuel battery cell 210 is incorporated into the cell plate 310. .

  As illustrated, the fuel cell 300 fastens each fuel cell 210, the terminal plate 202, and the end plate 110 with left and right left gripping portions 220L and right gripping portions 220R. As shown in FIG. 7, the cell plate 310 is formed by bending a long plate, includes MEAs 232 at a predetermined pitch, and places indicated by two-dot chain lines in the figure between the MEAs are so-called mountain folds / A predetermined flat plate region including the MEA 232 is made to face by bending in a valley fold shape. The gap between the opposed flat plate regions is set as an incorporation region 320 of the separator 270 and the seal plates 260 on both sides thereof. That is, since the flat plate region corresponds to the flat plate region in the cell plate 230 described above, in this embodiment, the cell plates in one fuel battery cell are connected at one end and are alternately folded. In this case, a gas supply hole is formed around the MEA 232 in each flat plate region.

  The upper and lower ends of the built-in region 320 are closed by the flat plate portion 310T between the bent portions, and the other end is closed by the bent piece 312 on both sides of the flat plate portion 310T. The relationship is repeated alternately. As shown in FIG. 7, the bent piece 312 is formed by bending the sheet end portion cut by the notches K formed on both sides of the flat plate portion 310T, and the above-described mountain-folded bending for forming the flat plate portion 310T. Accordingly, it joins with the bent piece 312 of the adjacent embedded region 320. The bent pieces 312 joined in this way become the left gripping part 220L and the right gripping part 220R.

  The above-described built-in region 320 is configured such that the distance between the flat plate regions of the opposing separators is adjusted by adjusting the interval between the bent portions of the peaks and valleys for forming the flat plate portion 310T, so that the separator 270 shown in FIG. It is designed to be slightly smaller than the thickness of the 260 separator assembly.

  In manufacturing a fuel cell using the cell plate 310 described above, first, a long plate shown in FIG. 7 is prepared, and a predetermined pitch of the MEA 232 is formed and gas diffusion layers 250 and 252 are formed on both surfaces of the MEA. In parallel with or before or after the MEA formation, the notch K and the bent piece 312 are bent, and then the bent portion 312 is bent to form the flat plate portion 310T. As a result, the embedded areas 320 are formed side by side as described above.

  Next, the separator assembly 270 shown in FIG. 8 and the separator assembly products of the seal plates 260 on both sides thereof are assembled in the assembling region 320 after slightly expanding the respective assembling regions 320. Then, by pressing in the cell stacking direction, the bent pieces 312 are joined, and the joined bent pieces 312 are joined and fixed by heat fusion, adhesive, or the like, and the left gripping part 220L on the both sides of the flat plate part 310T and the right side The separator assembly product is fastened by the side gripping part 220R.

  The flat plate portion 310T and the bent piece 312 extend outward from the outer edge of the separator 270 included in the separator assembly, and surround the separator 270 with the outer edge of the separator. Specifically, at one end of the separator 270, the flat plate portion 310T surrounds the outer edge of the separator, and at the other end, bent pieces 312 on both sides of the flat plate portion 310T (that is, the left holding portion 220L and the right holding portion 220R) surround the separator outer edge. . Therefore, even in this embodiment, the effects such as the separator contact avoidance described above can be obtained.

  The embodiment shown in FIGS. 1 to 5 can be modified as follows. FIG. 9 is an explanatory view showing an exploded fuel cell 210 of a modified example, and FIG. 10 is an explanatory view showing an exploded fuel cell 210 of another modified example.

  The cell plate 230 shown in FIG. 9 has a left bent piece 240L and a right bent piece 240R at the upper and lower ends thereof. Even in this type of cell plate 230, adjacent cell plates 230 surround the separator 270 with the outer edges of the separator at the upper and lower ends thereof by joining and fixing the left bent pieces 240L and the right bent pieces 240R. . Since the cell plate 230 shown in FIG. 10 has the front bent piece 240F and the rear bent piece 240B at the left and right ends of the plate, the separator 270 is surrounded by the upper, lower, left and right separator outer edges. This is preferable because the displacement between the MEA 232 and the separator 270 can be suppressed in any of the vertical and horizontal directions.

  As mentioned above, although the embodiment of the present invention has been described in the embodiments, the present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes without departing from the gist thereof. Is possible. For example, with respect to the terminal plate 202 and the end plate 110, the separator 270 may be surrounded by the cell plate 230 only in the fuel cell 210 without using the cell plate 230S or the cell plate 230E. Further, if the adjacent cell plates 230 exert a sufficient pressing force on the separator 270, the bolts 114 and the shaft 112 can be omitted.

1 is a perspective view schematically showing an overall configuration of a fuel cell 100 as an embodiment of the present invention. It is explanatory drawing which shows roughly a mode that the fuel cell 100 was cut | disconnected in the AA cross section of FIG. FIG. 3 is an explanatory view showing a state of stacking cells while disassembling and showing a fuel cell 210 constituting the fuel cell 100. It is explanatory drawing which shows the mode of formation of the cell plate 230 which the fuel battery cell 210 has. It is a perspective view which shows roughly the whole structure of the fuel cell 300 as another Example. FIG. 6 is an explanatory diagram schematically showing a state in which the fuel cell 300 is cut along the BB cross section of FIG. 5. It is explanatory drawing which shows the shape of the cell plate 310 which comprises the fuel cell 210 of the fuel cell 300, and the mode of the formation. It is explanatory drawing which shows a mode that the fuel cell 210 is integrated in the cell plate 310. FIG. It is explanatory drawing which decomposes | disassembles and shows the fuel cell 210 of a modification. It is explanatory drawing which decomposes | disassembles and shows the fuel cell 210 of another modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Fuel cell 110 ... End plate 112 ... Shaft 114 ... Bolt 120i ... Air introduction manifold 120o ... Air exhaust manifold 122i ... Hydrogen introduction manifold 122o ... Hydrogen exhaust manifold 124i ... Cooling water introduction manifold 124o ... Cooling water discharge manifold 200 ... Cell lamination Body 202 ... Terminal plate 210 ... Fuel cell 220C ... Center gripping part 220L ... Left gripping part 220R ... Right gripping part 220CE ... Center gripping part 230 ... Cell plate 230E ... Cell plate 230S ... Cell plate 233i ... Air introduction hole 233o ... Air exhaust holes 234i ... Hydrogen introduction holes 234o ... Hydrogen exhaust holes 235i ... Cooling water introduction holes 235o ... Cooling water discharge holes 240C ... Center bent pieces 240F ... Front bent pieces 240L ... Left bent Piece 240B ... Back bent piece 240R ... Right bent piece 250 ... Gas diffusion layer 252 ... Gas diffusion layer 260 ... Seal plate 260E ... Seal plate 261 ... Window 262i ... Air introduction hole 262o ... Air exhaust hole 263i ... Hydrogen introduction hole 263o ... Hydrogen exhaust hole 264i ... Cooling water introduction hole 264o ... Cooling water discharge hole 270 ... Separator 271i ... Air introduction hole 271o ... Air exhaust hole 272i ... Hydrogen introduction hole 272o ... Hydrogen exhaust hole 273i ... Cooling water introduction hole 273o ... Cooling water discharge hole DESCRIPTION OF SYMBOLS 300 ... Fuel cell 310 ... Cell plate 310T ... Flat plate part 312 ... Bending piece 320 ... Assembling area S ... Slit K ... Notch

Claims (4)

A fuel cell in which an insulating cell plate having a membrane electrode assembly in which electrodes are bonded to both sides of an electrolyte membrane, and a separator having a flow path for a reaction gas supplied to the membrane electrode assembly,
The cell plate includes an extending piece extending outside the outer edge of the separator,
The adjacent cell plates surround the separator on the outer edge side of the separator by the extending piece portion of the cell plate on one side and the extending piece portion of the cell plate on the other side. . The fuel cell according to claim 1,
The adjacent cell plate surrounds the separator by the extending piece part on the outer edge side at one end of the separator and the outer edge side at the other end. The fuel cell according to claim 2, wherein
The adjacent cell plates are bent and continuous on the outer edge side at one end of the separator, and the continuous portion is used as the extending piece portion on the one outer edge side. A fuel cell according to any one of claims 1 to 3,
The adjacent cell plates are configured to join and fix the extending pieces for each cell plate, and exert a pressing force along the stacking direction of the cell plates on the separator.

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