JP2016131088A - Fuel battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery that can secure the contact surface pressure at the center portion in the cell plane of the fuel battery.SOLUTION: A fuel battery comprises a laminate body 12 having a laminate of plural cells, a pair of end plates 13 arranged so as to sandwich both the ends of the laminate body 12 in a lamination direction, and a fastening member for pressurizing the end plates 13 to fasten the end plates. The laminate body 12 has a first side surface 15 in parallel to the lamination direction and a second side surface 16 confronting the first side surface 15, and contains a first part 17 and a third part 19 located at the side of the first side surface 15 when viewed in the lamination direction, a second part 18 confronting the first part 17, and a fourth part 20 confronting the third part 19, the second part 18 and the fourth part 20 being located at the side of the second side surface 16. The end plates 13 and the fastening member 14 are fastened so that a load for fastening the second part 18 and the third part 19 is larger than a load for fastening the first part 17 and the fourth part 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel cell using a polymer electrolyte used for a portable power source, a power source for portable devices, a power source for electric vehicles, a home cogeneration system, and the like.

  A fuel cell using a polymer electrolyte generates electric power and heat simultaneously by electrochemically reacting a fuel gas containing hydrogen and an oxidant gas containing oxygen such as air. This fuel cell basically includes a polymer electrolyte membrane that selectively transports hydrogen ions and a pair of electrodes formed on both sides of the polymer electrolyte membrane, that is, an anode and a cathode.

  These electrodes are mainly composed of carbon powder supporting a platinum group metal catalyst, and have both a gas permeability and an electronic conductivity disposed on the outer surface of the catalyst layer formed on the surface of the polymer electrolyte membrane and the catalyst layer. It has a gas diffusion layer. The assembly in which the polymer electrolyte membrane and the electrode (including the gas diffusion layer) are integrally joined in this way is called an electrolyte membrane electrode assembly (hereinafter, abbreviated as “MEA”).

  Further, on both sides of the MEA, conductive separators for mechanically sandwiching and fixing the MEAs and electrically connecting adjacent MEAs to each other in series are disposed.

  Gas separators are formed in portions of the separator that come into contact with the MEA to supply reaction gas such as fuel gas and oxidant gas to the respective electrodes and carry away generated water and surplus gas. Such a gas flow path can be provided separately from the separator, but a system in which a groove is provided on the surface of the separator to form a gas flow path is common.

  A structure in which MEA is sandwiched between a pair of separators is called a cell. Since the fuel cell generates heat during operation, it is necessary to cool the fuel cell with cooling water or the like in order to maintain the battery in a favorable temperature state. Usually, a cooling unit for flowing cooling water is provided for every 1 to 3 cells.

  After alternately stacking these MEAs, separators, and cooling units and laminating 10 to 200 cells, end plates are arranged on both ends of the laminate via current collector plates and insulating plates, It is the structure of a general laminated battery (fuel cell stack) that sandwiches this laminated body and is fixed from both ends with fastening bolts and rods.

  In such a stacked battery, a plurality of cells including a cooling unit are stacked in one direction, a pair of end plates are arranged at both ends, and each end plate is fixed with a fastening bolt and a rod, and each cell is fixed. A tightening method is used.

  As such a tightening method, from the viewpoint of mechanical strength, a metal material such as stainless steel is usually used for the end plate and fastening bolt, and the end plate and fastening bolt are insulated from the laminated battery. A structure is employed in which the plate is electrically insulated and current does not leak outside through the end plate.

  In addition, an end plate that is integrated with an insulating plate and molded or processed an insulator is also used. As for fastening bolts, a method of passing through a through-hole formed in the edge of the separator and a method of fastening the entire laminated battery with a metal belt over an end plate are common.

  In a laminated battery in which such a fastening method is adopted, it is important that the battery is fastened with a uniform fastening force in a cell plane (in a plane orthogonal to the stacking direction). This uniform fastening force prevents air, hydrogen, cooling water, etc. from leaking and prevents damage to the cell. In addition, it is possible to increase power generation efficiency and extend battery life. .

  From the standpoint of uniformizing the fastening force in such a tightening method, the end plate is brought into surface contact with the laminated body by following the band by reducing the rigidity in the direction in which the end plate is likely to be warped. A method for uniformly transmitting a load has been proposed (see, for example, Patent Document 1).

  FIG. 16 shows a cross section of a conventional fuel cell described in Patent Document 1. As shown in FIG. 16, the fuel cell 100 includes a cell stack 101, an end plate 105, and a fastening member 109. In the cell stack 101, a pair of current collector plates 103 are disposed at both ends of a single cell stack, and the cell stack 101 is sandwiched between a pair of end plates 105. The fastening member 109 is held by winding a laminate 108 composed of the cell laminate 101 and the end plate 105.

JP 2011-210604 A

  However, in the above-described conventional configuration, the stress is evenly concentrated toward the end portion of the end plate when the stack is fastened, so that the end plate and the laminate are deformed in a drum shape. As a result, the contact surface pressure at the center portion in the cell surface of the laminate is reduced, the contact resistance is increased, and the power generation performance is degraded.

  The present invention solves the above-described conventional problems, and by appropriately transmitting the fastening load to the cell surface central portion of the laminate, it is possible to ensure in-plane contact pressure and maintain sufficient power generation performance. An object of the present invention is to provide a fuel cell using a molecular electrolyte.

  In order to solve the above-described conventional problems, the fuel cell of the present invention includes a fastening load transmitted from the fastening member and the end plate to the laminate, and two opposing side portions of the surface orthogonal to the lamination direction of the laminate. The part where the load is increased between the diagonally opposite sides and the part where the load is reduced are arranged.

  As a result, the laminate is prevented from being deformed in a drum shape, and the fastening load is transmitted from the fastening member and the end plate to the center portion in the cell plane of the laminate, especially in the straight portion connecting the portions where the load is increased. Thus, an appropriate contact surface pressure can be ensured at the central portion in the cell surface.

  The fuel cell of the present invention can ensure the contact surface pressure at the center portion in the cell plane of the laminate, and can ensure sufficient power generation performance with a simple configuration.

1 is a perspective view of a fuel cell according to Embodiment 1 of the present invention. The top view which looked at the boundary surface of the laminated body and end plate of the fuel cell in Embodiment 1 of this invention from the lamination direction 2 is a partial cross-sectional view of the fuel cell according to Embodiment 1 of the present invention, cut in the stacking direction along the line II in FIG. FIG. 2 is a partial cross-sectional view of the fuel cell according to Embodiment 1 of the present invention, taken along the line II-II in FIG. The perspective view of the fuel cell in Embodiment 2 of this invention The top view which looked at the boundary surface of the laminated body and end plate of the fuel cell in Embodiment 2 of this invention from the lamination direction FIG. 6 is a partial cross-sectional view of the fuel cell according to Embodiment 2 of the present invention, taken along the line III-III in FIG. FIG. 6 is a partial cross-sectional view of the fuel cell according to Embodiment 2 of the present invention, taken along the line IV-IV in FIG. The top view which looked at the boundary surface of the laminated body and end plate of the fuel cell comprised with the rib-shaped end plate in Embodiment 2 of this invention from the lamination direction FIG. 9 is a partial cross-sectional view taken along the line III-III in FIG. 9 of the fuel cell configured by the rib-shaped end plate in the second embodiment. The top view which looked at the laminated body in Embodiment 3 of this invention from the lamination direction FIG. 11 is a partial cross-sectional view of the fuel cell according to Embodiment 3 of the present invention, taken along the line VV in FIG. The top view which looked at the laminated body in Embodiment 4 of this invention from the lamination direction Partial sectional view of the fuel cell according to Embodiment 4 of the present invention, taken along the line VI-VI in FIG. Partial sectional view of the fuel cell according to Embodiment 4 of the present invention, cut in the stacking direction along the line VII-VII in FIG. Cross section of conventional fuel cell

  A first invention is a laminate in which a plurality of cells are laminated, a pair of end plates arranged so as to sandwich both ends of the laminate in the laminating direction, and a fastening member that presses and fastens the pair of end plates The laminate includes a first side surface parallel to the stacking direction, and a second side surface facing the first side surface, and the first portion and the first portion located on the first side surface side when viewed from the stacking direction. A second portion, a third portion located on the second side surface and facing the first portion; and a fourth portion facing the second portion; the fastening member and the pair of end plates include the second portion and the third portion The fuel cell is configured to be fastened so that a load for fastening the parts is larger than a load for fastening the first part and the fourth part.

  By adopting the above configuration, in the two opposite side portions of the surface orthogonal to the stacking direction of the laminate, a portion that increases the load on the diagonally opposite side and a portion that decreases the load are disposed. In the linear part connecting the parts that increase the size, the fastening load is transmitted from the fastening member and the end plate to the central part in the cell surface of the laminate, and it is possible to ensure an appropriate contact surface pressure in the central part in the cell surface. it can.

  According to a second invention, in the fuel cell according to the first invention, at least one of the fastening member and the pair of end plates has a portion overlapping the second portion and the third portion when viewed from the stacking direction, It is configured to be thicker than the portion overlapping the fourth portion.

  By setting it as the said structure, it becomes possible to adjust a fastening load with the thickness of a fastening member and an end plate.

  As a result, in two opposing side portions of the surface perpendicular to the stacking direction of the laminate, a portion that increases the load on the diagonally opposite side and a portion that decreases the load are arranged, so a straight line connecting the portions that increase the load. In the shaped portion, the fastening load is transmitted from the fastening member and the end plate to the central portion in the cell surface of the laminate, and an appropriate contact surface pressure can be secured in the central portion in the cell surface.

  According to a third invention, in the fuel cell of the first or second invention, the fastening member is a first fastening member disposed outside the first portion, a second fastening member disposed outside the second portion, Including a third fastening member disposed outside the third portion and a fourth fastening member disposed outside the fourth portion, wherein the length of the second fastening member and the third fastening member in the stacking direction is It is comprised shorter than the length of the lamination direction of the 1 fastening member and the 4th fastening member.

  By setting it as the said structure, it becomes possible to adjust a fastening load with the length of the lamination direction of a fastening member.

  As a result, in two opposing side portions of the surface perpendicular to the stacking direction of the laminate, a portion that increases the load on the diagonally opposite side and a portion that decreases the load are arranged, so a straight line connecting the portions that increase the load. In the shaped portion, the fastening load is transmitted from the fastening member and the end plate to the central portion in the cell surface of the laminate, and an appropriate contact surface pressure can be secured in the central portion in the cell surface.

  According to a fourth invention, in the fuel cell according to the first invention, the stacked body is located on the first side surface side and the second side surface side when viewed from the stacking direction. The fastening member and the pair of end plates further include a sixth part facing each other, and a load for fastening the second part, the third part, and the sixth part is a load for fastening the first part, the fourth part, and the fifth part. It is set as the structure fastened so that it may become larger.

  By adopting the above-described configuration, the portion where the load is increased on the diagonally opposite sides and the portion where the load is reduced are arranged at three points in the opposing portion of the surface orthogonal to the stacking direction of the stacked body. The straight part connecting the parts to be connected is increased, and the fastening load is transmitted from the fastening member and the end plate to the central part in the cell surface of the laminate, and the proper contact surface pressure is ensured in the central part in the cell surface without fail. Can do.

  According to a fifth aspect of the present invention, there is provided a laminate in which a plurality of cells are laminated, a pair of end plates arranged so as to sandwich both ends of the laminate in the laminating direction, and a fastening member that presses and fastens the pair of end plates The laminated body includes a first side surface parallel to the stacking direction and a second side surface opposite to the first side surface, where n is a natural number of 2 or more, and is on the first side surface side when viewed from the stacking direction. 1st part-2n-1 part located, 2nd side part located on the 2nd side and facing the 1st part-2n-1 part, respectively, a fastening member and a pair of The end plate has a configuration in which m is a natural number and is fastened so that a load for fastening the fourth m-2 portion and the fourth m-1 portion is larger than a load for fastening the fourth m-3 portion and the fourth m portion. It is a battery.

  By setting it as the said structure, in the 2 side part which the surface orthogonal to the lamination direction of a laminated body opposes, the part which increases a load diagonally opposite side, and the part which reduces a load are set to the desired number of places. Thus, the fastening load is uniformly transmitted from the fastening member and the end plate to the central portion in the cell surface of the laminate, and an appropriate contact surface pressure can be reliably ensured in the central portion in the cell surface.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a perspective view of a fuel cell 11 according to Embodiment 1 of the present invention.

The fuel cell 11 includes a laminated body 12 composed of a plurality of cells and a pair of current collectors, an upper end plate 13a and a lower end plate 13b provided on both outer sides of the laminated body 12, and an outer side of the upper end plate 13a and the lower end plate 13b. A fastening member 14 provided on both sides, a first fastening rod 31, a second fastening rod 32, a third fastening rod 33, a fourth fastening rod 34, fastening nuts 45, 46, 47, 48; The inlet side manifold 61 and the outlet side manifold 62 are at least configured.

  The inlet side manifold 61 and the outlet side manifold 62 penetrate the laminated body 12, the upper end plate 13 a, and the fastening member 14. The stacked body 12 has a first side surface 15 that is parallel to the stacking direction and a second side surface 16 that faces the first side surface 15.

  FIG. 2 is a plan view of the fuel cell 11 according to Embodiment 1 of the present invention when the boundary surface between the stacked body 12 and the upper end plate 13a is viewed from the stacking direction.

  As shown in FIG. 2, the stacked body 12 includes a first portion 17 and a third portion 19 on the first side surface 15 side as viewed from the stacking direction, and a first portion 17 on the second side surface 16 side. And a fourth portion 20 opposite to the third portion 19.

  The first portion 17 and the second portion 18 are present in the portion on the II line connecting the first fastening rod 31 and the second fastening rod 32, and the third portion 19 and the fourth portion 20 are the third fastening. It exists in the II-II line upper part which connects the rod 33 and the 4th fastening rod 34. FIG.

  3 is a partial cross-sectional view of fuel cell 11 according to Embodiment 1 of the present invention, cut in the stacking direction along line II in FIG. As shown in FIG. 3, the thickness of the upper end plate 13 a in the stacking direction is such that the portion overlapping the second portion 18 is thicker than the portion overlapping the first portion 17.

  4 is a partial cross-sectional view of fuel cell 11 according to Embodiment 1 of the present invention, taken along the line II-II in FIG. 2 in the stacking direction. As shown in FIG. 4, the thickness of the upper end plate 13 a in the stacking direction is such that the portion overlapping the third portion 19 is thicker than the portion overlapping the fourth portion 20.

  As an example, the thickness in the stacking direction of the upper end plate 13a of the second portion 18 and the third portion 19 was made 0.5 mm thicker than the thickness of the upper end plate 13a of the first portion 17 and the fourth portion 20 in the stacking direction. . Further, the fastening members 14 were fastened so that the lengths of the fuel cells 11 in the stacking direction were uniform.

  As a result, the load of the second portion 18 and the third portion 19 becomes larger than the load of the first portion 17 and the fourth portion 20. Note that the present invention is not limited to the embodiments. About the fuel cell 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, as described above, since the load of the second portion 18 and the third portion 19 is larger than the load of the first portion 17 and the fourth portion 20, the stacked body 12 has a drum shape in the cell in-plane direction of the stacked body 12. Suppressing deformation, especially in the linear portion connecting the second portion 18 and the third portion 19, the fastening load is transmitted from the fastening member 14 and the upper end plate 13a to the center portion in the cell surface of the laminate 12, The contact surface pressure can be secured at the center portion in the cell plane.

  As a result, the fuel cell 11 can maintain sufficient power generation performance. In the present embodiment, the load is controlled by the difference in thickness of the upper end plate 13a. However, the fastening load may be controlled by the difference in thickness of the lower end plate 13b, the fastening member 14, or the laminated body 12.

  Here, the material of the upper end plate 13a and the lower end plate 13b only needs to have at least rigidity sufficient to exert electrical insulation and a fastening force due to a fastening load, such as polyphenylene sulfide resin which is a thermoplastic resin. In addition, a phenol resin that is a thermosetting resin, or a metal plate such as aluminum, and an insulating resin plate can be used in combination.

  The material of the fastening member 14 only needs to have at least rigidity sufficient to exert the fastening force due to the fastening load, and is preferably composed of metals such as stainless steel, hard rubber, or synthetic resin. Can do.

(Embodiment 2)
FIG. 5 is a perspective view of the fuel cell 11 according to Embodiment 2 of the present invention. In FIG. 5, the same components as those in FIGS.

  The fuel cell 11 of the present embodiment includes an end plate 13 provided on both outer sides of the laminate 12, a fifth fastening rod 35, a sixth fastening rod 36, a seventh fastening rod 37, an eighth fastening rod 38, A fastening nut 45, a fastening nut 46, a fastening nut 47, and a fastening nut 48 are configured.

  FIG. 6 is a plan view of the boundary surface between the stacked body 12 and the end plate 13 of the fuel cell 11 according to Embodiment 2 of the present invention as viewed from the stacking direction. In FIG. 6, the same components as those in FIGS.

  The first portion 17 and the second portion 18 are present in the portion on the III-III line connecting the fifth fastening rod 35 and the sixth fastening rod 36, and the third portion 19 and the fourth portion 20 are the seventh fastening rod. It exists in the part on the IV-IV line which connects 37 and the 8th fastening rod 38. FIG.

  FIG. 7 is a partial cross-sectional view of the fuel cell according to Embodiment 2 of the present invention, taken along the line III-III in FIG. 6 in the stacking direction. FIG. 8 is a partial cross-sectional view of the fuel cell according to Embodiment 2 of the present invention, taken along the line IV-IV in FIG. 6 in the stacking direction. 7 and 8, the same components as those in FIGS. 1 to 6 are denoted by the same reference numerals and description thereof is omitted.

  The length of the sixth fastening rod 36 disposed outside the second portion 18 is shorter than the length of the fifth fastening rod 35 disposed outside the first portion 17. The length of the seventh fastening rod 37 disposed on the outer side is shorter than the length of the eighth fastening rod 38 disposed on the outer side of the fourth portion 20.

  As an example, the lengths of the sixth fastening rod 36 and the seventh fastening rod 37 were made shorter by 0.5 mm than the lengths of the fifth fastening rod 35 and the eighth fastening rod 38. As a result, the load of the second portion 18 and the third portion 19 becomes larger than the load of the first portion 17 and the fourth portion 20.

  Note that the present invention is not limited to the embodiments. About the fuel cell 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the load of the second portion 18 and the third portion 19 is larger than the load of the first portion 17 and the fourth portion 20, the stacked body 12 is deformed in a drum shape in the cell in-plane direction of the stacked body 12. Suppress.

  In particular, in the linear portion connecting the second portion 18 and the third portion 19, the fastening load is transmitted from the fastening member 14 and the end plate 13 to the central portion in the cell surface of the laminated body 12, and contacts the central portion in the cell surface. Surface pressure can be secured. As a result, the fuel cell 11 can maintain sufficient power generation performance.

  In the present embodiment, a particularly high effect is exhibited by making the end plate 13 into a rib shape.

FIG. 9 shows a fuel cell 11 composed of a rib-shaped end plate 13c according to Embodiment 2 of the present invention.
It is the top view which looked at the boundary surface of the laminated body 12 and the rib-shaped end plate 13c from the lamination direction. FIG. 10 is a partial cross-sectional view of the fuel cell 11 constituted by the rib-shaped end plate 13c according to the second embodiment, taken along the line III-III in FIG. 9 and 10, the same components as those in FIGS. 1 to 8 are denoted by the same reference numerals and description thereof is omitted.

  The rib-shaped end plate 13 c has ribs 55 that are in contact with the laminate 12. Thereby, in the linear part connecting the second part 18 and the third part 19, the fastening load is transmitted to the center part in the cell surface of the laminate 12, and also to the laminate 12 and the rib contact part 56. An appropriate contact surface pressure can be ensured over a wider range.

  Further, in the linear portions of the first portion 17 and the second portion 18 and the linear portions of the third portion 19 and the fourth portion 20, the fastening load becomes an overload on the center portion in the cell plane of the laminate 12. Transmission can be suppressed, and deformation and destruction of the constituent members can be prevented.

(Embodiment 3)
FIG. 11 shows a plan view of the laminated body according to the third embodiment of the present invention as seen from the laminating direction. 11 is the same as FIG. 7 and the partial cross-sectional view cut along the IV-IV line in FIG. 11 is the same as FIG. FIG. 12 is a partial cross-sectional view of fuel cell 11 according to Embodiment 3 of the present invention, taken along the line VV in FIG. 11 in the stacking direction.

  11 and 12, the same components as those in FIGS. 1 to 10 are denoted by the same reference numerals, and description thereof is omitted.

  The fuel cell 11 of the present embodiment includes an end plate 13 provided on both outer sides of the laminate 12, a fifth fastening rod 35, a sixth fastening rod 36, a seventh fastening rod 37, an eighth fastening rod 38, The ninth fastening rod 39, the tenth fastening rod 40, the fastening nut 45, the fastening nut 46, the fastening nut 47, the fastening nut 48, the fastening nut 49, and the fastening nut 50 are configured.

  The stacked body 12 includes a first portion 17, a third portion 19, and a fifth portion 21 on the first side surface 15 side as viewed from the stacking direction, and a first portion 17 on the second side surface 16 side that faces the first portion 17. The second portion 18 includes a fourth portion 20 facing the third portion 19, and a sixth portion 22 facing the fifth portion 21.

  The first portion 17 and the second portion 18 are present in the portion on the III-III line connecting the fifth fastening rod 35 and the sixth fastening rod 36, and the third portion 19 and the fourth portion 20 are the seventh fastening rod. The fifth portion 21 and the sixth portion 22 are present in the VV portion connecting the ninth fastening rod 39 and the tenth fastening rod 40.

  The length of the sixth fastening rod 36 disposed outside the second portion 18 is shorter than the length of the fifth fastening rod 35 disposed outside the first portion 17 and is disposed outside the third portion 19. The length of the seventh fastening rod 37 is shorter than the length of the eighth fastening rod 38 disposed outside the fourth portion 20. Furthermore, the length of the tenth fastening rod 40 disposed outside the sixth portion 22 is shorter than the length of the ninth fastening rod 39 disposed outside the fifth portion 21.

  As an example, the lengths of the sixth fastening rod 36, the seventh fastening rod 37, and the tenth fastening rod 40 are 0.5 mm longer than the lengths of the fifth fastening rod 35, the eighth fastening rod 38, and the ninth fastening rod 39. Shortened.

  Accordingly, the loads of the second portion 18, the third portion 19, and the sixth portion 22 are larger than the loads of the first portion 17, the fourth portion 20, and the fifth portion 21.

  Note that the present invention is not limited to the embodiments. About the fuel cell 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the loads of the second portion 18, the third portion 19 and the sixth portion 22 are larger than the loads of the first portion 17, the fourth portion 20 and the fifth portion 21, in the cell in-plane direction of the stacked body 12, It suppresses that the laminated body 12 deform | transforms into a drum shape.

  In particular, in the linear portion connecting the second portion 18 and the third portion 19 and the linear portion connecting the third portion 19 and the sixth portion 22, the fastening load is from the fastening member and the end plate 13 to the cell surface of the laminate 12. It is also transmitted to the inner central portion, and the contact surface pressure can be reliably ensured at the inner central portion of the cell surface. As a result, the fuel cell can maintain sufficient power generation performance.

(Embodiment 4)
FIG. 13: shows the top view which looked at the laminated body in Embodiment 4 of this invention from the lamination direction. A partial cross-sectional view taken along line III-III in FIG. 13 in the stacking direction is the same as FIG.

  FIG. 14 is a partial cross-sectional view of fuel cell 11 according to Embodiment 4 of the present invention, taken along the VI-VI line in FIG. 13 in the stacking direction. FIG. 15 is a partial cross-sectional view of fuel cell 11 according to Embodiment 4 of the present invention, taken along the line VII-VII in FIG. 13 in the stacking direction.

  13, 14, and 15, the same components as those in FIGS. 1 to 12 are denoted by the same reference numerals, and description thereof is omitted.

  The fuel cell 11 includes end plates 13 provided on both outer sides of the laminate 12, a fifth fastening rod 35 to a second 1-3 fastening rod 41, a second 11-1 fastening rod 43, and a sixth fastening rod 36 to 36. The second l-2 fastening rod 42, the second l fastening rod 44, a fastening nut 45, a fastening nut 46, a fastening nut 51, a fastening nut 52, a fastening nut 53, and a fastening nut 54 are included. Here, l is a natural number of 4 or more.

  The stacked body 12 includes a first portion 17 to a second n−1 portion 27 on the first side surface 15 side as viewed from the stacking direction, and a second surface facing the first portion 17 on the second side surface 16 side. A second n portion 28 facing the portion 18 to the second n-1 portion 27 is provided. Here, n is a natural number of 2 or more.

  The first portion 17 and the second portion 18 are present in the portion on the III-III line connecting the fifth fastening rod 35 and the sixth fastening rod 36, and the second n-3 portion 29 and the second n-2 portion 30 are The second n-1 portion 27 and the second n portion 28 are present on the VI-VI line portion connecting the second l-3 fastening rod 41 and the second l-2 fastening rod 42, and the second l-1 fastening rod 43 and the second l fastening. Present in the VII-VII portion connecting the rods 44.

  The length of the sixth fastening rod 36 disposed outside the second portion 18 is shorter than the length of the fifth fastening rod 35 disposed outside the first portion 17 and is disposed outside the second n-2 portion 30. The length of the second 2-1 fastening rod 42 thus made is shorter than the length of the second 1-3 fastening rod 41 disposed outside the second n-3 portion 29. Further, the length of the second l-1 fastening rod 43 arranged outside the second n-1 portion 27 is shorter than the length of the second l fastening rod 44 arranged outside the second n portion.

  As an example, the lengths of the sixth fastening rod 36, the second l-2 fastening rod 42 and the second l-1 fastening rod 43 are set to the lengths of the fifth fastening rod 35, the second l-3 fastening rod 41 and the second l fastening rod 44. 0.5 mm shorter than the length.

  As a result, the loads on the fourth m-2 portion 24 and the fourth m-1 portion 25 are larger than the loads on the fourth m-3 portion 23 and the fourth m portion 26. Here, m is a natural number.

  Note that the present invention is not limited to the embodiments. About the fuel cell 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the loads of the fourth m-2 portion 24 and the fourth m-1 portion 25 are larger than the loads of the fourth m-3 portion 23 and the fourth m portion 26, the stacked body 12 is in the cell in-plane direction of the stacked body 12. Suppresses deformation in a drum shape. In particular, the fastening load is transmitted from the fastening member 14 and the end plate 13 to the center portion in the cell surface of the laminate 12 at the linear portion connecting the fourth m-2 portion 24 and the fourth m-1 portion 25.

  Furthermore, by setting n (natural number of 2 or more) and m (natural number) to desired values, the contact surface pressure can be more uniformly ensured in the center portion in the cell plane. As a result, the fuel cell can maintain sufficient power generation performance.

  The fuel cell according to the present invention secures a contact area in the center of the cell surface of the laminate and can maintain sufficient power generation performance. Therefore, a portable power source, a power source for portable devices, and a power source for electric vehicles It can also be used for applications such as home cogeneration systems.

DESCRIPTION OF SYMBOLS 11 Fuel cell 12 Laminated body 13 End plate 13a Upper end plate 13b Lower end plate 13c Rib-shaped end plate 14 Fastening member 15 1st side surface 16 2nd side surface 17 1st part 18 2nd part 19 3rd part 20 4th part 21 5th Part 22 6th part 23 4m-3 part 24 4m-2 part 25 4m-1 part 26 4m part 27 2n-1 part 28 2n part 29 2n-3 part 30 2n-2 part 31 1st fastening rod 32 2nd fastening rod 33 3rd fastening rod 34 4th fastening rod 35 5th fastening rod 36 6th fastening rod 37 7th fastening rod 38 8th fastening rod 39 9th fastening rod 40 10th fastening rod 41 2nd 1-3 fastening rod 42 2nd-2 fastening rod 43 2nd-1 fastening rod 44 2l-1 fastening rod 45-54 Fastening nut 55 Bed 56 rib contact portion 61 the inlet-side manifold 62 outlet side manifold

Claims (5)

A laminated body in which a plurality of cells are laminated, a pair of end plates disposed so as to sandwich both ends of the laminated body in the laminating direction, and a fastening member that presses and fastens the pair of end plates;
With
The laminated body includes a first side surface parallel to the laminating direction and a second side surface facing the first side surface, and a first portion and a third portion located on the first side surface side as viewed from the laminating direction. A portion, and a second portion located on the second side surface and facing the first portion and a fourth portion facing the third portion;
The fastening member and the pair of end plates are configured to be fastened so that a load for fastening the second part and the third part is larger than a load for fastening the first part and the fourth part.
Fuel cell. At least one of the fastening member and the pair of end plates has a portion that overlaps the second portion and the third portion thicker than a portion that overlaps the first portion and the fourth portion when viewed from the stacking direction. Configured,
The fuel cell according to claim 1. The fastening member includes a first fastening member disposed outside the first portion, a second fastening member disposed outside the second portion, a third fastening member disposed outside the third portion, And a fourth fastening member disposed outside the fourth portion,
The length in the stacking direction of the second fastening member and the third fastening member is configured to be shorter than the length in the stacking direction of the first fastening member and the fourth fastening member.
The fuel cell according to claim 1 or 2. The laminated body further includes a fifth portion located on the first side surface side and a sixth portion located on the second side surface and facing the fifth portion when viewed from the laminating direction,
In the fastening member and the pair of end plates, the load for fastening the second portion, the third portion, and the sixth portion is greater than the load for fastening the first portion, the fourth portion, and the fifth portion. Configured to be fastened,
The fuel cell according to claim 1. A laminated body in which a plurality of cells are laminated, a pair of end plates disposed so as to sandwich both ends of the laminated body in the laminating direction, and a fastening member that presses and fastens the pair of end plates;
With
The stacked body includes a first side surface parallel to the stacking direction and a second side surface facing the first side surface, wherein n is a natural number of 2 or more, and the first side surface side as viewed from the stacking direction. A first portion to a second n-1 portion located in the second side portion, and a second portion to a second n portion located on the second side surface and opposed to the first portion to the second n-1 portion, respectively.
In the fastening member and the pair of end plates, m is a natural number, and a load for fastening the fourth m-2 portion and the fourth m-1 portion is larger than a load for fastening the fourth m-3 portion and the fourth m portion. Configured to fasten,
Fuel cell.