JP2008300120A - Current collecting plate for fuel battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current collecting plate for a fuel battery suitable to cope with voltage drop in a manifold zone, suppression of a calorific value, and increase and suppression of thermal capacity. <P>SOLUTION: In the current collecting plate 3 for a fuel battery in which through-holes 6 are provided as well as the through-holes 6 for forming supply and discharge manifolds 7 for supplied fuel fluid are laminated at laminated ends of fuel battery cells 2 of a fuel battery stack 1 having a plurality of fuel battery cells 2 wherein the through-holes 6 for forming supply and discharge manifolds 7 for supplied fuel fluid is provided on the outside of a power generation zone, and an output terminal 13A is projected to the outside rather than a section where the through-holes 6 exist, the current collecting plate 3 is formed by increasing a plate thickness dimension among a zone 11 narrowing its width by the through-hole 6 between a current collecting zone 10 and the output terminal 13A of the current collecting plate 3, a part of a zone 15A of the current collecting zone 10, and a part of a zone 15B of the output terminal 13A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a current collector plate for a fuel cell that is disposed at the end of a cell stack in which a plurality of fuel cells of a fuel cell stack are stacked, and in particular, for a supply / discharge manifold for fuel fluid or the like supplied to the fuel cell. The present invention relates to a current collector plate for a fuel cell having a through hole.

Conventionally, in order to extract electric power from a fuel cell stack configured by stacking a plurality of fuel cells, it is disposed at the cell stack end of the fuel cell stack, and is used for a supply / discharge manifold such as a fuel fluid supplied to the fuel cells. A fuel cell current collector having a through hole has been proposed (see Patent Document 1).
JP 2006-332006 A

  By the way, when the fuel cell stack is used in a vehicle, particularly a passenger car, etc., the space in the height direction is limited because it is often arranged under the floor of the passenger compartment. For this reason, also in the above-described conventional example, the fuel cell stack has a plurality of fuel cells stacked in the horizontal direction, and a supply / discharge manifold for fuel fluid or the like supplied to the fuel cells is also provided on both sides in the horizontal direction of the fuel cells. The output terminal of the current collector plate arranged at the cell stack end of the fuel cell stack is also arranged so as to protrude in the lateral direction of the fuel cell stack through the part penetrating each manifold.

  However, as described above, in the configuration in which the output terminal is provided at the end of the current collector plate through the region including the manifold, the manifold is provided between the current collector region of the current collector plate and the output terminal. There will be a region with a small cross-sectional area, and when the generated current from the operation of the fuel cell stack is taken out from the output terminal of the current collector plate, the amount of heat generated in the region including the manifold of the current collector plate constitutes the current collector region. There is a problem that the amount of heat generated by the general plate portion is larger, and the power generation efficiency is lowered (voltage drop) and the life of the seal member for each fluid seal with the manifold is lowered. In order to solve this problem, when a uniformly thick current collector plate is used so as to increase the cross-sectional area of the electric circuit in the region where the manifold exists, the heat capacity of the current collector plate is greatly increased. It is expected that the start-up time will be longer when the stack is cold.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a current collector plate for a fuel cell that is suitable for coexistence of a decrease in voltage in the manifold region, suppression of heat generation, and increase in heat capacity. And

  According to the present invention, the fuel cell is stacked at a stack end of a fuel cell of a fuel cell stack including a plurality of fuel cells including a through hole for forming a supply / discharge manifold for a fuel fluid to be supplied outside the power generation region, In the current collector plate for a fuel cell, which is provided with a through hole similarly to the through hole for forming the supply / discharge manifold of the cell, and has an output terminal protruding outside the portion where the through hole exists, Increasing the plate thickness of the area narrowed by the through hole between the current collecting area and the output terminal, and the partial area of the current collecting area adjacent to this area and the partial area of the output terminal Formed.

  Therefore, in the present invention, a region where the width is narrowed by a through hole between the current collecting region of the current collector plate and the output terminal, a part of the current collecting region adjacent to this region, and one of the output terminals. Since the plate thickness dimension with the area of the part is increased, the cross section of the electric path between the current collecting area and the output terminal, that is, the electric path in the area narrowed by the through hole, and the connection to this electric path The cross-sectional area for the concentrated flow to the connecting part with the current path and the diffused flow from the connecting part with the current flow in the width direction of the current collecting plate at the front and rear portions can be increased, and the collector plate manifold is provided. By suppressing the amount of heat generated in the region, it is possible to prevent a decrease in power generation efficiency (voltage decrease) and a decrease in the life of the seal member for each fluid seal with the manifold. In addition, since it is only partially thickened, the increase in heat capacity due to the increase in the volume of the current collector plate can be minimized, and the increase in start-up time at low temperatures of the fuel cell stack should also be minimized. Can do.

  Hereinafter, the current collector plate for a fuel cell of the present invention will be described based on each embodiment.

(First embodiment)
1 and 2 show a first embodiment of a current collector plate for a fuel cell to which the present invention is applied, FIG. 1 is a plan view of a fuel cell stack using the current collector plate for a fuel cell of this embodiment, and FIG. It is a perspective view of the collector plate for fuel cells of this embodiment.

  In FIG. 1, a fuel cell stack 1 includes a plurality of fuel cells 2 stacked, and a current collecting plate 3 with an output terminal, an insulating heat insulating layer 4, and an end plate 5 outside the stacked end of the stacked fuel cells 2. Are arranged in this order. In addition, a tension plate (not shown) is bridged between the end plates 5, and the ends of the tension plates are bolted to the end plates 5, whereby a predetermined compression is performed in the stacking direction of the stacked fuel cells 2. Force (fastening load) is applied.

  Although not shown, the fuel cell 2 includes an electrolyte membrane made of an ion exchange membrane and a membrane / electrode assembly made up of a pair of electrodes sandwiching the electrolyte membrane from both sides, and a pair of the membrane / electrode assembly held from the outside. And a separator. The separator is a conductor based on, for example, metal or carbon, and has a gas flow path for supplying a cathode gas such as air and an anode gas such as hydrogen gas to each electrode. The cathode gas and anode gas supplied to each electrode cause an electrochemical reaction in the membrane / electrode assembly of the fuel cell 2 to generate an electromotive force. In addition, the electrochemical reaction is an exothermic reaction, and the separator is also provided with a refrigerant flow path for flowing a refrigerant (cooling water or the like) for cooling the fuel cell.

  Each fuel cell 2, current collector plate 3, insulating heat insulating layer 4, and one end plate 5 constituting the fuel cell stack 1 are formed with through holes 6 for manifold formation, and these through holes 6 are overlapped. Thus, manifolds 7 for anode gas circulation, cathode gas circulation and refrigerant circulation are formed penetrating in the cell stacking direction.

  The current collector plate 3 is formed in a plate shape from a metal such as iron, stainless steel, copper, or aluminum, and is disposed so as to be in direct contact with the stacked end of the stacked fuel cells 2. The surface of the current collector plate 3 that contacts the fuel cell 2 is subjected to a surface treatment such as plating using gold, silver, aluminum, nickel, zinc, tin, etc., and the contact resistance with the fuel cell 2 Is secured. The insulating heat insulating layer 4 is made of an insulating material and has a function of insulating the current collector plate 3 and the end plate 5 and a heat insulating function between the fuel cell 2 and the end plate 5. As the insulating material constituting the insulating heat insulating layer 4, a thermosetting resin such as an epoxy resin, a heat resistant thermoplastic resin such as polyamide or polyamide synthetic fiber, alumina, an oxide ceramic sheet, or the like may be employed. it can. The end plate 5 is formed in a plate shape with various metals (iron, stainless steel, copper, aluminum, etc.), like the current collecting plate 3.

  In the configuration of the general fuel cell stack 1 described above, the fuel cell current collector plate 3 of the present embodiment is configured as shown in FIG. That is, in FIG. 2, the current collector plate 3 of the present embodiment includes a central current collecting region 10 and a manifold region having through holes 6 constituting the manifolds 7 arranged on both sides of the current collecting region 10. 11 and 12 and a terminal region 13 constituting an output terminal 13A provided on the outer side of one manifold region 11 is formed of a substantially rectangular metal plate material. In FIG. 2, the through holes 6 for the manifold 7 are not limited to this arrangement but are arranged according to various purposes. For example, in one manifold region 11, the through holes 6 are arranged from the other side. For the front, refrigerant, anode gas, and cathode gas are arranged. In the other manifold region 12, anode gas, cathode gas, and refrigerant are arranged from the other side to the front.

  The thickness of the other manifold region 12 and most of the current collecting region 10 (hereinafter referred to as “general current collecting region 10A”) and the tip side of the terminal region 13 are set to normal dimensions (for example, 4 [mm]). Although formed, the plate thickness dimension of one manifold region 11 and a part of the current collecting region 10 adjacent to the one manifold region 11 in the longitudinal direction and a part of the terminal region 13 are formed large. . That is, in one manifold region 11, four through-hole portions (hereinafter referred to as “connecting portions 14”) along the through-holes 6 constituting the manifold 7 and both ends of the connecting portions 14 are connected to the through-holes 6. The front and rear regions 15A that overlap the current collecting region 10 and the front and rear regions 15B that overlap the terminal region 13 are raised on one surface side to increase the plate thickness. The current collector plate 3 is disposed with the other surface side in contact with the stacked end of the stacked fuel cells 2. One surface side is in contact with the adjacent insulating heat insulating layer 4. In this case, the insulating heat insulating layer 4 is in contact with the other manifold region 12 and the general current collecting region 10A adjacent to the other manifold region 12 and one manifold region 11 of the current collecting plate 3 and its front and rear regions 15A and 15B. Is thickened by the height of the raised area, and absorbs a step between the other manifold region 12 and the general current collecting region 10A and the one manifold region 11 and its front and rear regions 15A and 15B.

The thickness of the connecting portion 14 and the front and rear regions 15A, 15B is such that the cross-sectional area (cross-sectional area taken along the line AA in the figure) crossing the length direction of the connecting portion 14 is the same as that of the general current collecting region 10A. The dimensions are set so that the cross-sectional area is equal to or equal to the cross-sectional area. For example, the cross-sectional area of the general current collecting region 10A is 400 mm ² (plate thickness 4 mm, plate width 100 mm), and the connecting portion 14 (each width dimension 10 mm × 4 lines = 40 mm (substantial width dimension)). For example, (400 ÷ 40 =) 10 mm or less than 10 mm is set.

  If the substantial width dimension of the connecting portion 14 is uniform at the longitudinal position of the connecting portion 14, the thickness dimension is set as described above. However, depending on the cross-sectional shape of the manifold 7, the substantial width portion is partially set. In the case where there is a portion where the dimension becomes smaller, the dimension in the thickness direction is set based on the above condition in the portion having the smallest substantial width dimension. Further, the thickness dimension of the front and rear regions 15A and 15B may be slightly thicker than the thickness dimension of the connecting portion 14. The step due to the difference in thickness can be absorbed by changing the thickness of the insulating heat insulating layer 4 to be superimposed.

  In the fuel cell stack 1 having the fuel cell current collector plate having the above-described structure stacked on the stack end of the fuel cell 2, cathode gas, anode gas and refrigerant are supplied from each manifold 7, and each fuel cell. When an electromotive force is generated by generating an electrochemical reaction in the membrane / electrode assembly 2, the current collecting plate 3 at the stacking end of the fuel cell 2 is connected to the current collecting plate 3 from the current collecting region 10. A current flows from the terminal region 13 to the current collecting region 10 via the one manifold region 11 in the other current collecting plate 3.

  The current passing through one manifold region 11 from the current collecting region 10 to the terminal region 13 or from the terminal region 13 to the current collecting region 10 of each current collecting plate 3 is collected in one front and rear region 15A or 15B. The flow flows in the longitudinal direction and also in the width direction and is concentrated on the connecting portion connected to the connecting portion 14 and flows to the connecting portion 14, and flows in the connecting portion 14 in the longitudinal direction. It flows to the other front / rear region 15A or 15B via the connecting portion with 15A or 15B, and flows in the longitudinal direction of the current collector plate 3 while being diffused again in the width direction of the current collector plate 3 in the other front / rear region 15A or 15B. .

  Since the minimum portion of the cross-sectional area of the connecting portion 14 constituting the manifold 7 is formed to be equal to or slightly smaller than the cross-sectional area of the general current collecting region 10A, the amount of heat generated at the connecting portion 14 is reduced to one of the manifolds. The area 11 can be made smaller as compared with a current collecting plate having the same thickness as that of the general current collecting area 10A.

  Further, since the thickness dimensions of the front and rear regions 15A and 15B are equal to or slightly thicker than the thickness of the connecting portion 14 forming the manifold 7, the front and rear regions 15A and 15B are connected to the connecting portion 14. In the connecting portion, a connecting area equal to or larger than the minimum cross-sectional area of the connecting portion 14 can be secured, and the amount of heat generated in the connecting portion has a uniform thickness in which one manifold region 11 has the same thickness as the current collecting region 10. It can be made smaller than the current collector plate 3.

  Accordingly, in the fuel cell stack 1 including the fuel cell current collector plate 3 of the present embodiment, the amount of heat generated in one manifold region 11 and its front and rear regions 15A and 15B increases, resulting in a decrease in power generation efficiency and sealing due to heat generation. In addition, the one manifold region 11 and its front and rear regions 15A and 15B are thicker than the general current collection region 10A by a size necessary for suppressing heat generation. The increase in the heat capacity of the current collector plate 3 can be suppressed to a small size, and the problem that the startup time of the fuel cell stack 1 at a low temperature can be lengthened can be eliminated.

  In the above embodiment, the description has been given of the current collector plate 3 disposed on both sides of the stacked end of the fuel battery cell 2 provided with the through holes 6 for the manifold 7. Only the current collector plate 3 is provided with the through hole 6 for the manifold 7, and the other current collector plate 3 is not provided with the through hole 6 for the manifold 7, that is, the fuel from one side in the stacking direction of the fuel cell stack 1. When the gas and refrigerant are supplied and discharged, the current collector plate 3 that does not have the through hole 6 for the manifold 7 on the side that becomes the output terminal 13A is configured by the current collector plate 3 having a uniform thickness. The current collector plate 3 having the configuration of the present embodiment may be used only for the current collector plate 3 on the side provided with the through hole 6 for the manifold 7 on the side to be the output terminal 13A.

  In the present embodiment, the following effects can be achieved.

  (A) Stacked at the stacking end of the fuel cell 2 of the fuel cell stack 1 including a plurality of fuel cells 2 provided with a through hole 6 for forming a supply / discharge manifold 7 for the supplied fuel fluid or the like outside the power generation region. The fuel cell 2 is provided with a through-hole 6 in a similar manner to the through-hole 6 for forming the supply / exhaust manifold 7 of the fuel battery cell 2 and a fuel cell provided with an output terminal 13A protruding outside the portion where the through-hole 6 exists. In the current collecting plate, a region 11 whose width is narrowed by a through hole 6 between the current collecting region 10 of the current collecting plate 3 and the output terminal 13A, and a part of the current collecting region 10 adjacent to the region 11 The thickness of the region 15A and the partial region 15B of the output terminal 13A is increased.

  Therefore, the electrical path between the current collecting area 10 and the output terminal 13A, that is, the cross-sectional area of the current path in the area 11 narrowed by the through hole 6 and the front and rear areas 15A and 15B connected to the current path. In addition, it is possible to increase the cross-sectional area of the current flow in the width direction of the current collector plate 3 with respect to the concentrated flow at the connection portion with the current path and the diffusion flow from the connection portion. By suppressing the amount, it is possible to prevent a decrease in power generation efficiency (voltage decrease) and a decrease in the life of the seal member for each fluid seal with the manifold 7. Further, since the thickness is only partially increased, an increase in heat capacity due to an increase in the volume of the current collector plate 3 can be minimized, and an increase in start-up time at a low temperature of the fuel cell stack 1 is also minimized. can do.

  (A) The plate thickness dimension of the partial region 15A of the current collecting region 10 and the partial region 15B of the output terminal 13A adjacent to the region 11 whose width is narrowed by the through hole 6 is the width of the through hole 6. Is formed thicker than the plate thickness dimension of the narrowed region 11, the connection area to the manifold region 11 can ensure a cross-sectional area equal to or greater than the cross-sectional area of the general plate portion region where the plate thickness is not increased. Therefore, the amount of heat generated at the connecting portion can be made equal to or less than that of the general plate portion.

  (C) The minimum cross-sectional area of the region 11 whose width is narrowed by the through hole 6 is set to be equal to or smaller than the cross-sectional area of the region where the thickness of the current collector plate 3 is not increased. Thus, when both cross-sectional areas are equal, the calorific value of the minimum cross-sectional area portion can be equal to the calorific value of a general plate portion where the plate thickness is not increased, and the minimum cross-sectional area is When the cross-sectional area is set to be equal to or less than the cross-sectional area of the general plate portion where the thickness is not increased, the amount of heat generated at the minimum cross-sectional area portion of the manifold region 11 rather than the current collecting plate formed with a uniform plate thickness. The increase in the heat capacity of the current collector plate 3 can be suppressed to a small value while reducing the current.

  (D) Increase in the plate thickness of the region 11 whose width is narrowed by the through hole 6 and the partial region 15A of the current collecting region 10 and the partial region 15B of the output terminal 13A adjacent to the region 11 The portion is formed by increasing the plate thickness on the side opposite to the cell stacking side, so that contact with the fuel cell 2 or the like to be stacked can be secured, and the portion between the fuel cell 2 and the current collector plate 3 can be secured. The amount of heat generated in the manifold region 11 and its adjacent regions 15A and 15B can be suppressed without changing the contact resistance.

(Second Embodiment)
3 to 5 show a second embodiment of a current collector plate for a fuel cell to which the present invention is applied. FIG. 3 is a plan view of a first example of a current collector plate for a fuel cell according to this embodiment. FIG. 5 is a perspective view of the fuel cell current collector of FIG. 3, and FIG. 5 is a plan view of a second example of the fuel cell current collector of the present embodiment. In the present embodiment, the configuration in the case where the through holes 6 constituting the manifold are formed in a different shape from the rectangular shape is added to the first embodiment. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  3 and 4, in the fuel cell current collector plate 3 of the first example of the present embodiment, a part of the wall surface inside the through hole 6 for the manifold 7 formed in one manifold region 11 is The connection region between the manifold 7 and the gas flow path is enlarged and formed in an arc shape so that the gas supply or gas discharge to the gas flow path provided in the separator of the fuel cell 2 is smooth. In this case, the manifold region is constituted by a connecting portion 14 and a region 16 that connects the connecting portion 14 to the front and rear regions 15A on the current collecting region 10.

  When a part of the wall surface of the through hole 6 is formed in an arc shape in this way, the cross-sectional area of the connecting portion 14 along the through hole 6 constituting the manifold 7 is one of the front and rear regions (within the current collecting region 10). From the 15A side toward the other front / rear region 15B (inside the terminal region 13), it gradually becomes smaller due to the arc-shaped wall surface, and becomes the minimum cross-sectional area at the stage of transition to the straight wall surface. Therefore, the plate | board thickness dimension of the connection part 14 is set similarly to 1st Embodiment with the cross-sectional area which follows the BB line from which the said wall surface becomes linear form. In addition, the plate | board thickness dimension of the manifold area | region 11 and its front and back area | region 15A, 15B is made into the same thickness dimension. A broken line in the figure is a boundary between the manifold region 11 and its front and rear regions 15A. Other configurations are the same as those in the first embodiment.

  As described above, the current collector plate 3 having the through hole 6 for the irregular shaped manifold 7 is also arranged and equipped at the stacking end of the fuel cell 2 of the fuel cell stack 1, so that the same as in the first embodiment. The heat generation amount in the manifold region 11 and the front and rear regions 15A and 15B thereof can be greatly suppressed from causing a decrease in power generation efficiency and the effect on the life of the seal due to heat generation. Only the front and rear regions 15A and 15B are made thicker than the general current collecting region 10A, so that the heat capacity of the current collecting plate 3 can be kept small. The problem that the startup time of the fuel cell stack 1 at a low temperature becomes long can be solved.

  Further, in this embodiment, the cross-sectional area (hatched) of the front and rear regions 15A and 15B (both on the current collecting region 10 side and the terminal region 13 side) with respect to the current collecting plate 3 width direction (the arrow direction in FIG. 4). Range) is configured with an area that is equal to or slightly less than the minimum cross-sectional area of the connecting portion 14 of the manifold region 11 (configured with an area that is equal to or slightly smaller than the cross-sectional area of the general current collecting region 10A). ing. With this configuration, the current is sufficiently wide with respect to the current flowing in the width direction of the current collector plate 3 from the current collector region 10 toward the connecting portion 14 of the manifold region 11 while flowing in the longitudinal direction of the current collector plate 3. An electric circuit can be provided.

  When the cross-sectional area of the front and rear region 15 in the width direction of the current collector plate 3 is made equal to the minimum cross-sectional area of the connecting portion 14 of the manifold region 11, the current collector plate 3 width in the front and rear regions 15A and 15B. The amount of heat generated due to the current flowing in the direction can be made equal to the amount of heat generated in the portion of the manifold area 11 with the minimum cross-sectional area. Further, when the cross-sectional area of the front and rear regions 15A and 15B in the width direction of the current collector plate 3 is smaller than that of the minimum cross-sectional area of the connecting portion 14 of the manifold region 11, the current collector plate has a uniform thickness. Compared with the case of forming 3, the heat capacity can be reduced while suppressing the amount of heat generated due to the current flowing in the width direction of the current collector plate 3 in the front and rear regions 15A and 15B.

  FIG. 5 shows the fuel cell current collector plate 3 of the second example of the present embodiment. In the current collector plate 3 of the present embodiment, the boundary portion between the region 11 of the connecting portion 14 of the current collector plate 3 of the first embodiment and the front and rear regions 15A on the current collector region 10 is not a straight line, It is formed in a shape that approximates an arcuate wall surface. Further, according to the change in the shape of the boundary portion, the boundary between the front and rear region 15 and the general current collecting region 10A is similarly changed to a shape that approximates the shape of the step portion of the boundary portion with the manifold region 11. Yes. Other configurations are the same as those of the first embodiment.

  In this embodiment, compared to the first embodiment, the connecting portion 14 of the connecting portion 14 constituting the manifold region 11 and the region 16 connecting the connecting portion 14 to the front and rear region 15A on the current collecting region 10 is provided. As a result of the reduction of the region 16 (increased in thickness) connected to the front and rear regions 15A on the current collecting region 10, the heat capacity of the current collecting plate 3 can be further reduced as compared with the first embodiment. Can do.

  In this embodiment, in addition to the effects (a), (c), and (d) in the first embodiment, the following effects can be achieved.

  (E) Plate thickness dimensions of a partial region 15A of the current collecting region 10 and a partial region 15B of the output terminal 13A adjacent to the region 11 whose width is narrowed by the through hole 6, and the width by the through hole 6 Since the plate thickness dimension of the region 11 in which is narrowed is equal, the change in the heat capacity in the manifold region 11 and its front and rear regions 15A and 15B can be minimized. Further, since the step between the two can be eliminated, the structure of the current collector plate 3 can be simplified, and the shape of the insulating heat insulating layer 4 to be laminated can be simplified.

  (F) The cross-sectional area of the current collecting area 10 adjacent to the area 11 narrowed by the through hole 6 and the partial area 15B of the output terminal 13A in the width direction of the current collector 3 is: The amount of heat generated in the front and rear regions 15A and 15B is equal to or equal to the cross-sectional area of the region where the plate thickness dimension of the current collector plate 3 is not increased by setting it equal to or less than the cross-sectional area. Can be equal to or less than the amount of heat generated in the general plate portion where the plate thickness dimension of the current collector plate 3 is not increased, and less than the cross sectional area of the region where the plate thickness size of the current collector plate 3 is not increased. In the case of the cross-sectional area, it is possible to suppress the increase in the heat capacity of the current collector plate 3 while reducing the amount of heat generated in the front and rear regions 15A and 15B as compared with the case where the current collector plate 3 is formed with a uniform thickness. it can.

The top view of the fuel cell stack which uses the current collector plate for fuel cells of one embodiment of the present invention. The perspective view of the collector plate for fuel cells of this embodiment similarly. The top view of the 1st Example of the current collector plate for fuel cells of 2nd Embodiment of this invention. FIG. 4 is a perspective view of the fuel cell current collector plate of FIG. 3. The top view of the 2nd Example of the current collector plate for fuel cells of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell stack 2 Fuel cell 3 Current collector plate 4 Insulation heat insulation layer 5 End plate 6 Through hole 7 Manifold 10 Current collection area 10A General current collection area 11, 12 Manifold area 13 Terminal area 13A Output terminal 14 Connecting part 15A, 15B Front and back area

Claims (6)

A fuel cell stack having a plurality of fuel cells each having a through hole for forming a supply / discharge manifold for fuel fluid to be supplied is provided outside the power generation region. In the fuel cell current collector plate provided with a through hole similarly to the through hole for forming the manifold, and provided with an output terminal protruding outside the portion where the through hole exists,
An area narrowed by a through hole between the current collecting area of the current collecting plate and the output terminal, and a partial area of the current collecting area adjacent to this area and a partial area of the output terminal A current collector plate for a fuel cell, wherein the current collector plate is formed with an increased thickness.   The plate thickness dimension of the partial region of the current collecting region and the partial region of the output terminal adjacent to the region narrowed by the through hole is the plate thickness dimension of the region narrowed by the through hole. The current collector plate for a fuel cell according to claim 1, wherein the current collector plate is formed thicker.   The plate thickness dimension of the partial region of the current collecting region and the partial region of the output terminal adjacent to the region narrowed by the through hole, and the plate thickness dimension of the region narrowed by the through hole The current collector plate for a fuel cell according to claim 1, wherein the current collector plate is formed equally.   The minimum cross-sectional area of the region narrowed by the through hole is set to be equal to or less than the cross-sectional area of the region where the thickness of the current collector plate is not increased. The current collector plate for a fuel cell according to any one of claims 1 to 3, wherein the current collector plate is a fuel cell current collector.   The cross-sectional area of the current collector region adjacent to the region narrowed by the through hole and the partial region of the output terminal in the width direction of the current collector plate increases the thickness of the current collector plate. The current collector plate for a fuel cell according to any one of claims 1 to 4, wherein the cross-sectional area is set to be equal to or less than a cross-sectional area of a region not formed.   The increased portion of the plate thickness dimension between the region narrowed by the through hole and the partial region of the current collecting region and the partial region of the output terminal adjacent to the region is opposite to the cell stacking side. The current collector plate for a fuel cell according to any one of claims 1 to 5, wherein the current collector plate is formed with an increased thickness on the side of the fuel cell.

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