JP5255849B2 - Fuel cell and separator / seal structure - Google Patents

Description

  The present invention relates to a fuel cell and a separator / seal structure. More specifically, a fuel cell and separator in which fuel is oxidized at the anode of a membrane / electrode assembly (MEA) composed of an anode, an electrolyte membrane, a cathode, and a diffusion layer, and oxygen is reduced at the cathode The present invention relates to a seal structure.

  With recent advances in electronic technology, portable electronic devices such as telephones, notebook computers, audio-visual devices, camcorders, and personal information terminal devices are rapidly spreading. Conventionally, such portable electronic devices are systems driven by secondary batteries, and new high-energy dense secondary batteries such as sealed lead-acid batteries, Ni / Cd batteries, Ni / hydrogen batteries, and even Li-ion secondary batteries. With the advent, portable devices have become smaller and lighter. On the other hand, higher functionality of portable devices has been attempted. In order to further increase the energy density of various secondary batteries, especially Li-ion secondary batteries, the development of battery active materials and the development of high-capacity battery structures have been promoted, realizing a power source that lasts longer in one charge. Efforts have been made.

  However, secondary batteries always require a charging operation after using a certain amount of power, and charging equipment and a relatively long charging time are required, so that mobile devices can be used continuously at any time and anywhere for a long time. There are many problems left to drive. In the future, portable devices are moving toward a direction that requires a higher power density and higher energy density power source, that is, a power source with a longer continuous drive time, in response to the increasing amount of information and its higher speed and higher functionality. . Therefore, there is an increasing need for a small generator that does not require charging, that is, a small generator that can be easily refueled.

  From such a background, a fuel cell power supply can be considered as one that can meet the above-mentioned demand. A fuel cell is a generator that consists of at least a solid or liquid electrolyte and two electrodes that induce a desired electrochemical reaction, an anode and a cathode, and converts the chemical energy of the fuel directly into electrical energy with high efficiency. . As the fuel, pure hydrogen, hydrogen chemically converted from fossil fuel or water, methanol which is a liquid or solution in a normal environment, alkali hydride, hydrazine or dimethyl ether which is a pressurized liquefied gas are used. Air or oxygen gas is used as the oxidant gas. The fuel is electrochemically oxidized at the anode and oxygen is reduced at the cathode, resulting in a difference in electrical potential between the electrodes. At this time, if a load is applied between the two electrodes as an external circuit, ion migration occurs in the electrolyte, and electric energy is extracted from the external load. For this reason, various types of fuel cells are highly expected to be used as electric vehicle power sources for large-scale power generation systems, thermal power generation systems, small distributed cogeneration systems, and engine generators.

  Among these fuel cells, solid polymer fuel cells and direct methanol fuel cells are membrane / electrode assemblies in which a polymer-like solid electrolyte membrane is composed of a carbon electrode carrying a catalyst such as platinum. The main feature is that (MEA: Membrane Electrode Assembly) is used. A pair of separators having a flow path for supplying fuel and oxidant gas to this MEA and having a current collecting action sandwiching the MEA through a sealing material that prevents leakage of fuel and oxidant gas It is called a single cell, and the fuel cell stack is formed by stacking a plurality of such single cells.

  Among these members, the separator is a member for efficiently supplying fuel and oxidant gas as an electrode, and is made of a carbon-based or metal-based conductive material.

  There are many types of separators. An internal manifold type in which fuel and oxidant gas are supplied to adjacent separators through holes provided in the separator, and there are no through holes for gas ventilation in the separator, and fuel and oxidant gas are respectively supplied from the side of the separator. It is divided into the external manifold type to supply. In addition, the separator is classified into some types depending on the structure of the surface in contact with the electrode or the diffusion layer. For example, there is a separator having an uneven shape on the electrode (diffusion layer) contact surface, or a separator in which a flat plate and an intercollector having an uneven shape or groove shape are combined. Separator materials are broadly classified into carbon and metal. Carbon-based carbon materials such as graphite can be blended with a resin material such as a phenolic resin as a binder and molded to form a plate material, which makes it easy to form a flow path to the plate material by cutting or the like. High degree of freedom in road shape.

  However, since the graphite separator material is brittle, a certain thickness or more is required from the viewpoint of strength. On the other hand, metal has a higher strength than graphite and has a merit that it can be made compact and lightweight because a metal thin plate is used. However, metal materials have battery degradation due to corrosion and growth of passive films, an increase in internal resistance, and restrictions on flow path formability due to metal plastic processing. Solutions to problems due to corrosion and passive film growth have been proposed previously, and in order to compensate for the drawbacks of flow path formability, they are dealt with by combining an intercollector and multiple metal plates with flow grooves. . On the other hand, Patent Document 1 discloses a technique for configuring a separator with a single metal plate. These separators according to the prior art have a structure in which a single metal plate having a channel groove and a frame structure surrounding the metal plate are provided. Since these use a single metal plate, the number of parts can be reduced, which is advantageous in terms of cost.

  Regardless of the carbon-based or metal-based separator, the fuel and oxidant gas are supplied from or discharged to the electrode surface from the manifold at the connecting portion having a concavo-convex structure between the manifold and the electrode surface flow channel. There is a problem that the oxidant gas leaks to the opposite electrode. As means for solving this, a type in which a concave groove is formed between the manifold and the channel groove and a type in which this part is in a tunnel shape are disclosed. In the former type, the sealing material or the electrolyte membrane may be deformed by the tightening pressure, and the groove of the connecting portion may be blocked or a gap may be generated. The fuel or oxidant gas may leak to the opposite pole through this gap. The latter is a method devised to overcome these drawbacks.

  For example, as disclosed in Patent Document 2, there is one in which the upper surface of the connecting portion is covered with a plate material. Further, there is one (Patent Document 3) in which a portion other than the channel groove is covered with a resin to prevent peeling of the flat plate and improve the sealing performance. Moreover, the shape of the gas flow path hole formed in the separator frame is horizontal within the same direction as the gas flow path groove formed on the side surface of the separator plate, and is formed within the thickness of the separator frame (Patent Document 4) There is. A fuel gas channel is also installed on the back side of the separator, and a device that enters the electrode surface through a channel that penetrates the separator and is bent to the crank (Patent Document 5 or Patent Document 6) is disclosed.

Japanese Patent Application Laid-Open No. 08-222237 JP 09-035726 A JP 2000-133289 A Japanese Patent No. 3594345 JP 2001-148252 A JP 2002-203578 A

  The above-described prior art is a material that is relatively excellent in moldability of a manifold and a channel groove, such as a carbon separator, and can be applied to a material having a thickness of about 1 to 2 mm or more. . However, it is difficult to apply the above-described conventional technique to a material having a thickness of 1 mm or less, such as a separator manufactured by press molding from a thin metal plate. The reason is that the connecting portion cannot have a sufficient thickness to apply a tunnel structure or installation of a plate material for covering.

  The object of the present invention is to solve these problems, and solves the problem that the fuel or oxidant gas in the connecting portion leaks to the opposite pole, and the fuel that can be thinned without increasing the number of parts. It is to provide a battery.

  According to the present invention, a fuel cell single cell in which an anode for oxidizing fuel and a cathode for reducing oxidant gas are formed via a proton conductive solid polymer membrane, and the fuel and the oxidant gas are supplied to the fuel cell. A fuel cell in which one or more separators each supplied to a single cell and one or more sealing materials for sealing the fuel and the oxidant gas are stacked, and the separator is supplied to the fuel cell single cell. And a flow path for supplying the oxidant gas, a manifold for supplying the fuel and the oxidant gas to the flow path or discharging the fuel and the oxidant gas from the flow path, the flow path and the manifold And the sealing material is disposed on both sides of the separator, and the through hole, the manifold and the flow path of the separator. Fuel cell is provided, characterized in that the formation of the communication flow path through between.

  A separator for supplying fuel and oxidant gas to a single fuel cell; and a seal member that is laminated on both sides or one side of the separator and seals the fuel and oxidant gas. A flow path for supplying the fuel and the oxidant gas to the single battery cell; a manifold for supplying the fuel and the oxidant gas to the flow path or discharging the fuel and the oxidant gas from the flow path; A separator / sealing structure having a through hole formed between the flow path and the manifold, and the sealing material forming a communication flow path between the through hole, the manifold and the flow path of the separator. Is provided.

  According to the present invention, the through-hole is provided in the separator, and in addition to the sealing function that is the conventional function, the sealing channel has an effect of having a function of a channel at the time of stacking. Thus, the occurrence of leakage to the opposite electrode can be prevented. Since this function can be provided only by the members applied conventionally, the number of parts does not increase. In addition, since the separator can be thinned, a compact fuel cell can be manufactured and is suitable as a power source for portable devices.

  In one best mode according to the present invention, the manifold, the channel, and the communication channel formed between the manifold and the channel have a continuous space, and the fuel and the oxidant gas. A fuel cell passing through the space is provided. Further, in the fuel cell, the communication channel formed by the through hole of the separator and the sealing material changes the flow direction of the fuel and the oxidant gas from the surface direction to the stacking direction, or from the stacking direction to the surface direction. A fuel cell is provided. Further, in the fuel cell, there is provided a fuel cell in which the sealing material has at least two different shapes, and the sealing materials having different shapes are arranged on both surfaces of the separator.

  Each of the sealing materials having at least two different shapes has at least one protrusion. In addition, a fuel cell is provided in which the protrusions are arranged so as to face each other with the separator interposed therebetween when the respective sealing materials are in contact with both surfaces of the separator. One or more through-holes of the separator are necessary, and thereby a fuel cell is provided which is disposed between the protrusions of the seal material.

  In the present invention, the manifold, the channel, and the communication channel formed between the manifold and the channel have a continuous space, and the fuel and the oxidant gas pass through the space. Provided is a separator / seal structure capable of Further, in the separator / seal structure, the communication flow path formed by the through hole of the separator and the sealing material has a flow direction of the fuel and the oxidant gas from a plane direction to a stacking direction, or from a stacking direction to a plane direction. A separator seal arrangement is provided that can be changed.

  In the separator / seal structure, there is provided a separator / seal structure in which the sealing material has at least two different shapes, and the sealing materials having different shapes are arranged on both surfaces of the separator. it can. Furthermore, each of the sealing materials having at least two different shapes has at least one protrusion. A separator / seal structure is provided in which the protruding portions are arranged so as to face each other with the separator interposed therebetween when the respective sealing materials are in contact with both surfaces of the separator. The separator has at least one through-hole, and provides a separator / sealing structure disposed between the protrusions of the sealing material.

  In the present invention, the separator is provided with a through-hole in a flow path for allowing the separator to pass fuel and oxidant gas or cooling water, a manifold, and a communication flow path between the manifold and the flow path. A seal material having a shape in which a space through which fuel and oxidant gas or cooling water flows is formed from the manifold to the through hole, and a space through which fuel and oxidant gas or cooling water flows is formed from the through hole to the flow path. The sealing material is disposed so as to contact both surfaces of the separator. When these components are stacked, a communication channel can be formed, and the communication channel can communicate the manifold and the channel.

  In addition, according to the present invention, the above-described communication flow path can be obtained by appropriately selecting the shape of the sealing material without forming a flow path groove in the separator or installing a plate material or the like. A path can be formed. Since the separator only forms a through hole, it can be thinned by about 0.1 to 0.2 mm.

  Further, according to the present invention, at least one protrusion is formed in a portion that becomes a communication flow path to the sealing material, and the through hole of the separator is arranged between the protrusions, thereby connecting The number of flow paths and the flow path width can be made to have desired shapes.

  Embodiments according to the present invention will be described below, but the present invention is not limited to the following embodiments.

  In the fuel cell of this embodiment, an anode for oxidizing the fuel and a cathode for reducing the oxidant gas are disposed via the proton conductive solid polymer membrane. The anode and the cathode are respectively disposed in contact with a separator that supplies the fuel and the oxidant gas to the fuel battery cell, and a sealing material that seals the fuel and the oxidant gas or cooling water. The separator is formed with a flow path for supplying fuel and oxidant gas to the cooling water, the anode and the cathode, for example, a groove, and a manifold and a through hole formed between the flow path and the manifold.

  The sealing material that is in contact with the front and back surfaces of the separator and has a function of sealing fuel and oxidant gas or cooling water forms a communication flow path that communicates the manifold and the flow path together with the through hole of the separator during lamination. . That is, the communication flow path has a space portion formed by a gap portion penetrating from the front to the back of the separator, and a space portion formed by a sealing material in contact with both surfaces of the separator, and the space communicates the manifold and the flow path. . Both surfaces of the sealing material should not overlap in the stacking direction of the flow path, the anode, and the cathode. As a result, when pressure is applied to the sealing material in the stacking direction, pressure is always received from the separator material, so that the sealing material is not deformed and a space causing a leak does not occur between the separator and the sealing material.

  In another form, the communication flow path part of the above aspect includes a plurality of flow paths. That is, the sealing material has a comb-teeth shape having at least one protrusion, and a through hole of the separator is disposed between the comb teeth of the sealing material. By adopting this configuration, the pressure loss and flow velocity of the fuel or oxidant gas flowing from the manifold to the flow path can be manipulated to desired values, and the flow distribution to each flow path is uniform according to the design operating conditions. It is sufficient to select such a shape as follows.

  There is no particular limitation on the material of the separator, and a carbon-based or metal-based material can be used. However, since the separator can be thinned, the thickness of the separator is 0 by using a relatively strong metal-based material. A thickness of about 1 to 0.2 mm is possible.

  The material of the sealing material is not particularly limited, but a polymer material such as EPDM (ethylene propylene rubber), fluorine rubber, and silicone rubber having excellent sealing properties, heat resistance, and chemical resistance is preferable. .

Example 1
A first aspect of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a separator / seal structure for a fuel cell according to the first embodiment of the present invention, and FIG. 2 is a development view of the separator / seal structure of FIG. The separator 3 is a SUS316L stainless steel metal plate with a wall thickness of 0.2 mm, and the manifold 11 for hydrogen gas, methanol aqueous solution, and oxidant gas used as fuel by press molding is located at each of the four corners, and the center. A total of six manifolds are provided at two ends for allowing cooling water to pass therethrough.

  On the front and back of the central part of the metal plate, the flow channel 12 projects. The height difference from the channel groove bottom 14 to the channel groove apex 15 is 0.5 mm. Further, between the manifold 11 and the flow channel 12, two through holes 10 are formed on one diagonal line. The sealing material 2 and the sealing material 4 have an outer diameter equivalent to that of the separator 3, and have a planar structure in which a surface in contact with the manifold 11 and the flow channel groove 12 of the separator 3 is removed.

  The shapes of the sealing material 2 and the sealing material 4 are different from each other, and the area of the fuel and the oxidizing gas inlet / outlet manifold of the sealing material 2 is smaller than that of the sealing material 4. These are in contact with both sides of the separator 3, respectively. At this time, as shown in FIG. 3, the sealing material 2 is arranged so as to surround the manifold 11 of the separator 3, but the sealing material 4 also surrounds the two through holes 11 in addition to the manifold 11 of the separator 3. It is an arrangement. For this reason, a continuous space is formed from the manifold 11 to the flow channel 12 by laminating the sealing material 2, the sealing material 4, and the sealing material 3. 3A is a plan view of the separator / seal structure, FIG. 3B is a side view, and FIG. 3C is a bottom view.

  The fuel or oxidant gas passes from the manifold 11A through the space formed by the surfaces of the sealing material 4 and the separator 3, through the through hole 10A, through the surface formed by the surfaces of the sealing material 2 and the separator 3, and through the flow path. The groove 12 is reached. After passing through the channel groove 12, it passes through the space formed by the surfaces of the sealing material 2 and the separator 3 on the diagonal line, passes through the through hole 10B, and passes through the space formed by the surfaces of the sealing material 4 and the separator 3 And reaches the manifold 11B.

  FIG. 4 is a developed configuration diagram of a single cell in which the separator and the sealing material having such a configuration are arranged symmetrically via the MEA. That is, the single cell is composed of sealing material 4A / separator 3A / sealing material 2A, diffusion layer / MEA1 / diffusion layer, sealing material 2B / separator 3B / sealing material 4B. In order to avoid complication of the figure, the diffusion layer is not shown. In some cases, this diffusion layer is not used. By stacking a plurality of single cells as described above as shown in FIG. 5, an output voltage according to the purpose can be obtained.

  FIG. 6 is a cross-sectional view taken along line A-A ′ of FIG. 5. The fuel and the oxidant gas flow as described above, and are supplied from the flow channel 12 to the anode and the cathode through the diffusion layer, respectively. The sealing material 2 and the sealing material 4 are disposed so as to overlap in the stacking direction.

  The sealing material 2 and the sealing material 4 in the communication channel 6 are separator 3A / sealing material 2 / solid polymer film 7B / sealing material 2 / separator 3B or separator 3B / sealing material 2 / solid polymer film 7A / seal, respectively. The material 2 / the separator 3A and the separator 3B / the sealing material 4 / the separator 3A are arranged. The sealing material 2 and the sealing material 4 are configured to be sandwiched between the separators 3.

  For this reason, since there is no discontinuous surface such as a step or a groove between the separator 3 and the sealing material 2 and the sealing material 4, the sealing performance can be improved.

(Example 2)
Another embodiment of the present invention will be described with reference to FIGS. In the first embodiment, one through hole 10 is installed on each diagonal line of the separator 3, but in this configuration, depending on the operating conditions, the fuel or oxidant gas may flow through the channel groove 12 due to drift or the like. May not flow uniformly to each flow path. Further, depending on the size of the through hole 10, the separator 3 may bend while being supported by the sealing material, and a gap may be generated between the sealing material and the separator. These can be prevented by dividing the through hole into a plurality of pieces.

  FIG. 7 is a diagram illustrating a structure in which protrusions are provided on the sealing material 2 and the sealing material 4 to form a comb shape, and a plurality of through holes 10 are provided between the respective comb-shaped protrusions. With such a configuration, the distance between the protrusions 13 on both sides of the through hole 10 can be shortened, and the deflection of the separator 3 can be suppressed. In addition, since the number and shape of the through holes 10 and the protrusions 13 can be set to a desired configuration, the pressure loss and flow rate of the fuel or oxidant gas can be controlled. FIG. 8 is an exploded perspective view showing the structure of a single cell configured using the separator / seal structure shown in FIG. The configuration of the fuel cell stack formed by stacking a plurality of single cells is the same as that shown in FIG.

(Example 3)
The separator 3 used in Example 1 and Example 2 is formed by press-molding a thin metal plate to form the manifold 11, the through hole 10, and the flow path 12. There are no material restrictions.

  FIG. 10 is a developed perspective view of the separator / seal structure when the carbon separator 8 is used. Carbon separator is a natural graphite blended with phenolic resin as a binder and processed into a 0.9mm plate shape by cutting and reciprocating 1.5 times with manifold, through hole and channel depth of 0.3mm. The serpentine flow path 9 turned back was formed.

  In order to reduce the reaction force of the sealing material, the outer periphery where the sealing material is installed is dug 0.3 mm. Although the wall thickness is thicker than that of a metal separator, a carbon separator can be configured to be free from leakage with a plate material of 1 mm or less. Since the graphite system has a high degree of freedom in workability, different flow paths can be formed on the front and back of the separator. FIG. 9 is a perspective view of the separator / seal structure shown in FIG.

Example 4
FIG. 12 shows an exploded perspective view of the fuel cell stack 21 using the configuration of the first embodiment. The battery includes a plurality of separator / seal components and other members. That is, the sealing material 4 / the separator 3 / the sealing material 2, the diffusion layer / MEA1 / the diffusion layer, and the sealing material 2 / the separator 3 are laminated in this order. The part through which the cooling water flows is configured by a combination of separator 3 / sealant 4 / separator 3, and the cooling water flows through the concave and concave spaces formed by facing the two separators.

  A stack of the separator 3, MEA 1, diffusion layer, sealing material 2, and sealing material 4 stacked in this way becomes the power generation unit 16 of the fuel cell stack 21.

  The fuel cell stack shown in FIG. 11 includes a current collecting plate 17 for extracting current and voltage from the power generation unit 16, an insulating plate 18 for electrically isolating the power generation unit 16, and an end plate 19 for fixing the power generation unit 16. This is a sandwiched configuration. In the fuel cell stack 21 according to the present embodiment, the MEA 1 is composed of five sheets, cooling is introduced from the cooling water inlet provided in the end plate 19, and the MEA 1 in the power generation unit 16 is not installed. This is performed between two separators 3. During power generation, fuel and oxidant gas are respectively supplied to the fuel inlet and the oxidant gas inlet provided in the end plate 19, and unreacted fuel and oxidant gas are discharged from the opposite end plate 19. .

The members used in the fuel cell stack 21 are as follows.
(1) MEA1 in which an electrode catalyst is applied to both sides of a solid polymer film having a thickness of 50 μm
(2) Diffusion layer not shown in the figure composed of carbon paper equal to the electrode area of MEA1 on both outer sides of MEA1 (3) Made of stainless steel with a plate thickness of 0.2 mm, both sides of the central part by press molding Separator 3 with concave and convex grooves on
(4) Seal material 2 and seal material 4 formed by stamping an EPDM sheet
(5) Current collecting plate 17 with a terminal in which conductive plating is applied to a copper plate having a thickness of 1 mm
(6) Insulating plate 18 forming manifold 11 by cutting PPS (polyphenylene sulfide) having a thickness of 5 mm
(7) End plate 19 provided with a joint serving as an inlet and a drain of fuel, oxidant gas and cooling water on a stainless steel plate having a thickness of 10 mm sandwiching these members
In this embodiment, the end plate is fastened and fixed using a bolt / nut made of stainless steel.

  In order to confirm the sealing performance of the fuel cell stack 21, a leak test using helium gas was performed. In the test, helium gas was sealed at 1 atm from the fuel inlet provided in the other end plate 19 with the fuel discharge port provided in the end plate 19 closed, and the oxidant gas Atmospheric pressure nitrogen gas was supplied from the inlet, and a helium gas detector was connected to the oxidant gas outlet. In the fuel cell stack 21 according to this example, helium was not detected by the helium detector, and it was confirmed that no leak occurred.

  A power generation test was performed using the fuel cell stack 21. Pure hydrogen was used as the fuel, and air as the oxidant gas was supplied to the fuel cell stack 21 after passing through a humidifier so that each dew point was 70 ° C. The temperature of the fuel cell stack 21 during power generation was set to 70 ° C. by controlling the ambient temperature.

  When power was generated at a fuel utilization rate of 70%, an air utilization rate of 40%, and a current density of 0.5 A / cm2, the output voltage was 3.5 V (0.7 V per unit cell). The open circuit voltage also reached 5.1 V (1.0 V per single cell), and it was confirmed that there was no leakage inside the stack.

(Example 5)
Using the fuel cell stack 21 having the same configuration as that of Example 4, a power generation test was conducted as a direct methanol fuel cell in which the fuel was an aqueous methanol solution. As the fuel, a 1 mol / L aqueous methanol solution was used, and air was supplied as an oxidant gas to the fuel cell stack 21 at an air utilization rate of 25%. In this example, only air was adjusted so that the dew point temperature was 30 ° C. The temperature of the fuel cell stack 21 during power generation was set to 60 ° C. by controlling the ambient temperature. When power was generated at a current density of 0.2 A / cm2, the output voltage was 2.0 V (0.4 V per single cell). The open circuit voltage was 4.2 V (0.84 V per unit cell), and it was confirmed that no leakage inside the stack occurred even when the fuel was liquid.

  The embodiment described above is a representative example, and the number and position of the through holes of the separator and the number of protrusions of the sealing material can be selected without depending on the shape. Any fuel or oxidant gas or cooling water can pass through the space formed by the metal separator 3 or the carbon separator 8 and the sealing material 2 and the sealing material 4 so that the manifold 11 and the flow path 12 communicate with each other. The shape of the continuous flow path 6 is not limited.

  In the above-described embodiment, the connection flow path 6 is formed from one side of the manifold. However, the present invention is not limited to this, and the connection flow path may be formed using another side of the manifold. Thereby, the cross-sectional area of a connection flow path can be increased, or the freedom degree of the position connected with the flow path 12 can be expanded. Regarding the channel structure, in this embodiment, a general straight channel and a serpentine channel are shown as representatives. However, the present invention is not limited to this, and a flow that can be distributed uniformly according to the shape of the connected channel. A road shape may be used.

The perspective view of the separator seal structure by the Example of this invention. FIG. 2 is a developed perspective view of the separator / seal structure of FIG. 1. The top view, side view, and bottom view of the separator / seal structure shown in FIG. 1 is an exploded perspective view of a single cell of a fuel cell according to the present invention. The expansion | deployment perspective view which shows the lamination | stacking method of multiple sets of the single cell shown in FIG. Sectional drawing along the A-A 'line of FIG. The expansion | deployment perspective view which showed the other form of the separator seal structure concerning this invention. FIG. 8 is a developed perspective view in which the separator / seal structure shown in FIG. 7 and a power generation unit are stacked. The perspective view of the further another form of the separator seal structure by this invention. FIG. 10 is an exploded perspective view of the separator / seal structure shown in FIG. 9. FIG. 3 is a developed perspective view of a fuel cell stack configured using a separator / seal structure according to the present invention.

Explanation of symbols

  1, 1A, 1B ... MEA (membrane / electrode assembly), 2, 2A, 2B, 4, 4A, 4B ... sealing material, 3, 3A, 3B ... separator, 6 ... communication channel, 7A, 7B ... MEA Solid polymer membrane, 8 ... carbon separator, 9 ... serpentine channel, 10, 10A, 10B ... through hole, 11, 11A, 11B ... manifold, 12 ... channel groove, 13A, 13B ... projection, 14 ... flow Road groove bottom, 15... Channel groove apex, 16 .. power generation section, 17... Current collector plate, 18 .. insulating plate, 19 .. end plate, 20.

Claims (2)

A fuel cell single cell in which an anode for oxidizing fuel and a cathode for reducing oxidant gas are formed via a proton conductive solid polymer membrane, and supplying the fuel and the oxidant gas to the single fuel cell, respectively A fuel cell in which one or more separators and one or more sealing materials for sealing the fuel and the oxidant gas are laminated,
The separator includes a flow path for supplying the fuel and the oxidant gas to the single fuel cell, and supplies the fuel and the oxidant gas to the flow path, or the fuel and the oxidant gas from the flow path. Having at least one through hole formed between the flow path and the manifold,
The sealing material is disposed on both sides of the separator, and forms a communication channel that passes between the through hole, the manifold, and the channel of the separator,
The sealing material has at least two different shapes,
Each of the sealing materials having at least two different shapes has at least one protrusion, and the protrusion sandwiches the separator when the sealing material is in contact with both surfaces of the separator. in Ri Na arranged as to face,
The through hole is a fuel cell characterized by Rukoto such are arranged between the projections of the sealing material. And a separator for supplying fuel and oxidant gas to the fuel cell unit is stacked on both surfaces of the separator, and a sealing member for sealing the fuel and the oxidant gas,
The separator includes a flow path for supplying the fuel and the oxidant gas to the single fuel cell, and supplies the fuel and the oxidant gas to the flow path, or the fuel and the oxidant gas from the flow path. And at least one through hole formed between the flow path and the manifold, and the sealing material is a communication flow path between the through hole, the manifold and the flow path of the separator. Form the
The sealing material has at least two different shapes,
Each of the sealing materials having at least two different shapes has at least one protrusion, and the protrusion sandwiches the separator when the sealing material is in contact with both surfaces of the separator. in Ri Na arranged as to face,
Through hole of the separator, the separator seal structure, characterized in Rukoto such are arranged between the projections of the sealing material.

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