JP2006164606A - Separator for fuel cell, and fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separator for a fuel cell which prevents drying in a flow passage inlet region and a flow passage middle region, and hardly causing flooding in an outlet region. <P>SOLUTION: The separator for a fuel cell is equipped with a grooved flow passage 1 for a fluid A in which the fluid A flows, a grooved main flow passage 2 for a fluid B in which the fluid B flows formed on the surface side by side with the flow passage 1 for the fluid A, an inlet manifold 11 for the fluid A connected with one end of the flow passage 1 for the fluid A, an outlet manifold 12 for the fluid A, an inlet manifold 13 for the fluid B, an outlet manifold 14 for the fluid B, a grooved inlet sub-passage 4a for the fluid B connected with the outlet manifold 13 for the fluid B though an inlet through-hole 3a for the fluid B, and a grooved outlet sub-passage 4b for the fluid B connected with the outlet manifold 14 for the fluid B through an outlet through-hole 3b for the fluid B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polymer electrolyte fuel cell separator used in a fuel cell that generates electricity using an electrochemical reaction, and a fuel cell stack configured using the separator.

Conventionally, as a fuel cell separator, two separators are used to form three fluid flow paths, an air flow path, a fuel flow path, and a cooling water flow path. There is known a fuel cell stack in which a cell is formed by sandwiching both surfaces of an electrode / membrane assembly composed of a molecular electrolyte membrane and an air electrode, and the cells are stacked in a plurality of stages (for example, patent documents) 1).
In this case, one separator is formed with a fuel gas flow path through which fuel gas flows in contact with the fuel electrode, and the other separator is formed with an air flow path through which air flows through contact with the air electrode. The cooling water flow path through which the cooling water flows does not come into contact with the electrode / membrane assembly.

  When this fuel cell stack is a polymer electrolyte fuel cell stack, for example, the fuel cell stack is operated at a temperature of about 80 ° C., and the water produced by the reaction between hydrogen and oxygen is not water vapor but water droplets at the air electrode. Since it is discharged, the air inlet manifold is on the upper side, the air outlet manifold is on the lower side, and the separator is often set up vertically with respect to the horizon so that water drops can be easily discharged.

JP 2001-57219 A

By the way, in the case of a polymer electrolyte fuel cell stack, air and fuel gas are humidified and supplied to the fuel cell stack in order to exhibit ionic conductivity only when water is contained. In the air channel outlet area, water droplets are likely to accumulate, and the air electrode in the air channel outlet area becomes excessively wetted, impairing gas diffusibility or causing a temporary blockage of the air channel. As a result, the air flow rate fluctuates and the cell voltage changes in an unstable manner.
Such inconvenience is caused in the air flow path side where several water molecules are transported per proton when the generated water is generated by the reaction and the proton moves from the fuel electrode to the air electrode through the solid polymer electrolyte membrane. Remarkably, the fuel gas side is also humidified close to saturation, and the fuel flow side has a similar disadvantage on the fuel flow path side where the flow rate is a fraction of air and the flow rate is slow.

In particular, in low humidification operation where the humidification temperature of air or fuel gas is lowered, lack of humidification in the air flow path inlet area and the air flow path center area and flooding in the air flow path outlet area are conspicuous. The current density is concentrated in the air flow path outlet area, the output voltage is nearly 100 mV lower than when humidified at high temperature, and the life deterioration is several times more serious. It was.
In addition, humidification of air and fuel gas at high temperatures consumes a large amount of heat and water, so households that also serve as hot water supply and power generation, which are expected to be the main applications of polymer electrolyte fuel cells. This has been a major impediment to the practical application of industrial cogeneration power supplies, business power supplies, and automotive power supplies.

  Further, in the fuel cell stack having the above configuration, it is necessary to prepare two types of separators having different configurations in order to flow three fluids, air, fuel gas, and cooling water.

As described above, in the conventional fuel cell stack, small water droplets gradually grow and accumulate on the air flow path outlet side or the fuel flow path outlet side, which is likely to cause a problem of flooding. There was a problem that there was a great restriction on driving that it was necessary to drive higher.
Moreover, in order to flow three fluids of air, fuel gas, and cooling water, it is necessary to prepare two types of separators, and there is a problem that the cost is increased.

An object of the present invention is to solve the above-described problems, and is a fuel cell separator that prevents drying in the flow path inlet area and the flow path center area and prevents the outlet area from being flooded. And to obtain a fuel cell stack.
Further, the separator may be of one type, and an object is to obtain a fuel cell separator and a fuel cell stack that can achieve cost reduction.

  The separator for a fuel cell according to the present invention includes a groove-shaped upper channel that is formed by bending a plurality of times on the surface of the main body and through which the fluid upper flows, and a fluid end that is formed side by side with the upper channel on the surface. A groove-shaped main channel for the groove, a former inlet manifold formed through the peripheral edge of the main body and connected to one end of the former channel, and connected to the other end of the former channel The former outlet manifold, the inlet manifold formed through the peripheral edge of the main body, the outlet manifold, and the outlet manifold formed on the back surface of the peripheral edge of the main body, through the inlet inlet hole. A groove-shaped secondary inlet sub-channel connected to the secondary inlet manifold, and a groove formed on the back surface at the peripheral edge of the main body and connected to the secondary outlet manifold via the secondary outlet through hole And a secondary outlet secondary channel.

  The fuel cell stack according to the present invention is the separator according to any one of claims 1 to 3, wherein both sides of an electrode / membrane assembly comprising an air electrode, a solid polymer electrolyte membrane, and a fuel electrode are provided. A fuel cell stack in which a plurality of sandwiched cells are stacked, wherein the fluid upper and the fluid second are oxidant gases, and the oxidant gas flowing from the upper inlet manifold is After being discharged from the former outlet manifold through the former channel, the second inlet manifold, the second inlet subchannel, the second inlet through hole, the second main channel, the second outlet through The holes are discharged from the outlet outlet manifold through the outlet outlet sub-flow channel.

  According to the fuel cell separator of the present invention, two types of fluids can be separately flowed into adjacent flow paths, whereby two fluids can be evenly distributed over the effective area of the electrode / membrane assembly on one surface. It becomes possible to supply.

  Further, according to the fuel cell stack of the present invention, the fluid A and the fluid B are used as the oxidant gas, and the exhaust gas from the fluid A is used as the inlet gas of the fluid B. Therefore, the water generated on the outlet side is supplied to the inlet side. Thus, drying can be prevented and the flow rate of the fluid can be doubled to prevent flooding.

  Further, according to the fuel cell stack of the present invention, since the fluid upper is made of fuel gas and the fluid B is made of cooling water, the fuel gas and the cooling water can be flowed to the adjacent flow paths, and the fuel gas, air, cooling water The number of separators required for two of the three fluid flow paths can be reduced to one, which greatly reduces the cost.

Hereinafter, each embodiment of the present invention will be described. In each figure, the same or corresponding members and parts will be described with the same reference numerals.
Embodiment 1 FIG.
1 is a plan view of the front side of a solid polymer fuel cell separator according to Embodiment 1 of the present invention, FIG. 2 is a plan view of the back side of the separator of FIG. 1, and A, B, The symbols C and D indicate the correspondence between the front and back sides.
On the front side of the main body of the separator, the first flow path 1 through which the fluid first flows and the second main flow path 2 through which the second fluid flows are alternately adjacent to each other, and each of them is formed by being folded a plurality of times.
On the back side of the main body of the separator, the flow passages 9 for the flow of fluid and the main flow passages 10 for the flow of the fluid are alternately adjacent to each other, and each of them is formed by being folded a plurality of times.
On one side in the longitudinal direction of the main body, an upper entrance manifold 11 for supplying the fluid upper to the upper passage 1 is formed. On the diagonal line of the upper inlet manifold 11, the upper passage 1 An outlet manifold 12 is formed from which the fluid upper is discharged. In the vicinity of the former inlet manifold 11, an inlet manifold 13 for supplying fluid B to the main main flow path 2 is formed. On the diagonal line of the second inlet manifold 13, a second outlet manifold 14 from which the fluid second from the second main flow path 2 is discharged is formed.

  Further, on the other side of the separator, there is formed a soot inlet manifold 15 that faces the sock inlet manifold 11 and supplies fluid soot to the soot flow path 9. Is formed with a soot outlet manifold 16 through which the soot from the soot channel 9 is discharged. In the vicinity of the throat inlet manifold 15, there is formed a throat inlet manifold 17 for supplying a fluid wing to the throat main flow path 10. An outlet manifold 18 for discharging the fluid is formed.

In addition, on the front side surface of the separator main body, there is formed a Dinge inlet sub-flow channel 6 a communicating with the Dingle inlet manifold 17. On the diagonal line of the couch inlet sub-flow channel 6a, a couch outlet sub-flow channel 6b communicating with the couch outlet manifold 18 is formed.
The leading end of the couch inlet sub-flow channel 6a is formed with a clog inlet through-hole 5a that penetrates the separator body and communicates the cuff main flow channel 10 and the clog inlet sub-flow channel 6a on the back side of the separator. Yes. At the leading end of the couch outlet sub-flow channel 6b, a clog exit through-hole 5b is formed which penetrates the separator main body and communicates the cuff main flow channel 10 and the couch outlet sub-flow channel 6b on the back side of the separator. Yes.

Further, a bottom inlet sub-flow channel 4 a communicating with the bottom inlet manifold 13 is formed on the back surface of the separator main body. On the diagonal line of the second inlet subchannel 4a, a second outlet subchannel 4b communicating with the second outlet manifold 14 is formed.
At the front end of the inlet inlet sub-flow channel 4a, there is formed an inlet inlet through-hole 3a that penetrates the separator main body and communicates with the outer side main channel 2 and the inlet inlet auxiliary channel 4a on the front side of the separator. Yes. At the front end of the outlet outlet sub-channel 4b, there is formed an outlet outlet through-hole 3b that penetrates the main body of the separator and communicates with the outlet main channel 2 on the front side of the separator and the outlet outlet sub-channel 4b. Yes.
Reference numeral 8 denotes an electrode region of the electrode / membrane assembly sandwiched between the separators.

In the fuel cell separator having the above-described configuration, the fluid upper is supplied from the upper inlet manifold 11 to the upper flow passage 1, is bent back several times, passes through every corner of the electrode region 8, and then the upper outlet manifold. 12 is discharged.
The fluid second flows from the second inlet manifold 13 through the second inlet sub-flow channel 4a on the back side of the separator and the second inlet through-hole 3a into the second main flow channel 2 on the front side. After being folded a plurality of times and passing through every corner of the electrode region 8, it is discharged to the outlet outlet manifold 14 through the outlet outlet through hole 3 b and the outlet outlet sub-channel 4 b on the back side of the main body.
The fluid soot is supplied from the soot inlet manifold 15 to the soot channel 9, is bent back multiple times, passes through every corner of the electrode region 8, and is discharged from the soot outlet manifold 16.
The fluid flow flows into the main flow passage 10 on the back side of the main body 10 through the flow passage inlet manifold 17 on the front side of the main body, and the flow passage through the through-hole 5a. After being folded a plurality of times and passing through every corner of the electrode region 8, it is discharged to the outlet manifold 18 through the outlet outlet through-hole 5 b and the outlet outlet sub-channel 6 b on the front side of the main body.

According to the separator of the first embodiment, the four types of fluids of A, B, B, and Ding are supplied to the electrode region 8 without being mixed.
In addition, on the front side of the separator, the former fluid and the second fluid are parallel and bent back several times in the middle, and the first inlet manifold 11 and the second inlet manifold 13 are provided close to each other. The outlet manifold 12 and the outlet manifold 14 are provided close to each other, but communicate with the inlet inlet sub-channel 4a, the outlet outlet sub-channel 4b, and these auxiliary channels 4a and 4b on the back side of the main body. By forming the inlet inlet through hole 3a and the outlet outlet through hole 3b, it is possible to prevent the former fluid and the outlet fluid from crossing each other.

  Further, on the back side of the main body, the bag fluid and the choke fluid are parallel and bent back several times in the middle, and the rod inlet manifold 15 and the drum inlet manifold 17 are provided close to each other. Although the manifold 16 and the outlet manifold 18 are provided close to each other, the outlet side passage 6a for the passage, the outlet side passage 6b for the passage, and the passages communicating with these passages 6a and 6b on the front side of the main body. By forming the inlet through-hole 5a and the outlet outlet through-hole 5b, it is possible to prevent the dredging fluid and the choking fluid from crossing each other.

Further, when the separator is used with the side A-B facing upward with respect to gravity, the inlet manifold 13 and the inlet manifold 17 are positioned at the uppermost position, and the outlet manifold 14 and the outlet manifold 14 are used. Since the outlet manifold 18 is located at the lowermost portion, water is not accumulated in the manifolds 13 and 17, and is discharged to the outlet manifold 14 and the outlet manifold 18 through the main channels 2 and 10.
That is, in the separator according to the first embodiment, especially in the fluid chamber and the fluid collator, even if they contain a large amount of water, they all flow into the main flow paths 2 and 10 and do not remain in the main flow paths 2 and 10. Can be discharged to the outside.

Embodiment 2. FIG.
3 to 6 are plan views of solid polymer fuel cell separators used in combination in a set of two sheets according to Embodiment 2 of the present invention. Reference numerals A, B, C, and D at four corners are shown. Indicates the correspondence between the front and back.
In this embodiment, an inlet manifold 19 for cooling water, which is a fluid tank, is formed at the intermediate portion on one side in the longitudinal direction of the first separator and the second separator. In the middle portion on the other side of the first separator and the second separator, a soot outlet manifold 20 is formed facing the soot inlet manifold 19.
On the surface of the first separator shown in FIG. 3, the upper channel 1 through which the fluid upper flows and the main main channel 2 through which the fluid second flows are formed in parallel with each other by being folded back multiple times.
A bottom inlet sub-channel 4a and a bottom outlet sub-channel 4b are formed diagonally on the back surface of the first separator shown in FIG.

On the surface of the second separator shown in FIG. 5, the soot channel 7 connecting between the soot inlet manifold 19 and the soot outlet manifold 20 is formed. The culvert channel 7 is bent a plurality of times at 90 degrees.
In addition, on the surface of the second separator, an entrance sub-channel 6a and an exit sub-channel 6b are formed diagonally.
On the back surface of the second separator shown in FIG. 6, a flow channel 9 for the flow of fluid and a main flow channel 10 for the flow of fluid flow are formed in parallel and each of which is bent back and forth multiple times.

In the fuel cell separator configured as described above, the fluid upper is supplied from the inlet manifold 11 for the first separator to the first separator in the first flow path 1, is bent back several times, and passes through every corner of the electrode region 8. , Discharged from the exit manifold 12 for the former.
The fluid second flows from the second inlet manifold 13 through the second inlet sub-channel 4a on the back side of the first separator and the second inlet through-hole 3a into the first main channel 2 on the front side of the first separator. After passing through the corners of the electrode region 8 several times in the middle of the main flow path 2 for the second, pass through the second outlet through hole 3b and the second outlet sub-flow path 4b on the back side of the first separator. It is discharged to the outlet manifold 14.
The fluid soot is supplied from the soot inlet manifold 15 to the soot flow path 9 on the back side of the second separator, is bent back several times in the middle, passes through every corner of the electrode region 8, and then from the soot outlet manifold 16. Discharged.
The fluid flow flows from the clog inlet manifold 17 through the clog inlet subchannel 6a on the front side of the second separator and the clog inlet through hole 5a into the cuff main flow channel 10 on the back side of the second separator. After being folded back several times in the main flow channel 10 and passing through the corners of the electrode region 8, it passes through the Ding outlet through hole 5b and the Ding outlet sub flow channel 6b on the front side of the second separator. It is discharged to the outlet manifold 18.
The fluid soot is supplied from the soot inlet manifold 19 shown in FIG. 5 to the soot channel 7 and discharged from the soot outlet manifold 20. This fluid bottle does not contact the electrode, and the bottle passage 7 functions as a coolant passage.

  In this embodiment, the same effect as in the first embodiment can be obtained, and further, a fluid tank (cooling water) can be allowed to flow through the separator without contacting the electrode.

Embodiment 3 FIG.
7 is a plan view of the front side of a solid polymer fuel cell separator according to Embodiment 3 of the present invention, FIG. 8 is a plan view of the back side of the separator of FIG. 7, and A, B, The symbols C and D indicate the correspondence between the front and back sides.
In the separator according to the third embodiment, the second inlet through hole 3a, the second outlet through hole 3b, the Ding inlet through hole 5a, and the Ding outlet through hole 5b are arranged in a row in parallel with the side surface end face of the separator. It is formed side by side.
Other configurations are the same as those of the separator of the first embodiment.

  In the separator according to this embodiment, the same effects as those in the first embodiment can be obtained, and the separators in the longitudinal direction on the side of the manifolds 11 and 12, the manifolds 13 and 14, and the manifolds 15 and 16 for the heel The outer dimension can be shortened, the ratio of the electrode region 8 can be secured sufficiently larger than the outer shape of the separator, and the cost of the separator can be reduced.

Embodiment 4 FIG.
FIGS. 9 and 10 are perspective schematic views of a fuel cell stack configured by stacking 50 stages of cells configured using the separator of Embodiment 1 shown in FIGS. 1 and 2.
In this embodiment, the case where air is an oxidant gas as the fluid upper, the air of the fluid upper exhausted from the outlet outlet manifold 12 as the fluid second, the cooling water as the fluid trap, and the fuel gas as the fluid coll. Yes.
The air that is the fluid upper enters the upper inlet manifold 11 from the arrow 33, is distributed, passes through the upper flow path 1 of the separator of each cell, and then gathers in the upper outlet manifold 12.
As shown in FIG. 9, the former outlet manifold 12 and the second inlet manifold 13 are connected by a connecting manifold 21, and the fluid second is distributed again from the second inlet manifold 13 to each of the first embodiment. After passing through the separator main passage 2, the separator is collected in the outlet outlet manifold 14 and discharged to the outside according to the arrow 34. That is, air is supplied to the single cell twice.

As a result, air that is warm and contains a large amount of water is once again supplied to the vicinity of the air inlet of the single cell by the generated water once generated through the single cell, so that the membrane is dried near the air inlet of the single cell. It is greatly eased.
In addition, since the air passes through the single cell twice, the air passing distance is doubled, and as a result, the linear flow velocity is doubled, and it is easy to blow off the water droplets in the upper channel 1 and the second main channel 2 accordingly. Compared with a separator having a continuous flow path on the same surface, it is not necessary to repeat complicated meandering, and the number of turn-back times of the first flow path 1 and the second main flow path 2 can be reduced. Can be lowered.

The fluid soot is cooling water, and the cooling water enters the soot inlet manifold 15 from the arrow 37 in FIG. 10, is distributed and passes through the soot channel 9 of each separator of the first embodiment, Collected in the outlet manifold 16 and discharged to the outside as indicated by an arrow 38.
The fluid catcher is a fuel gas, and the fuel gas enters the catch inlet manifold 17 from the arrow 35 in FIG. 10 and is distributed and passed through the catcher main flow path 10 of each separator in the first embodiment. Collected in the outlet manifold 18 and discharged to the outside as indicated by an arrow 36.

FIG. 11 is a schematic cross-sectional view showing a state when a pair of separators sandwich an electrode / membrane assembly in a fuel cell stack according to Embodiment 4. For simplicity, the numbers of the flow paths 1 and 9 and the main flow paths 2 and 10 are extremely reduced.
The electrode / membrane assembly is composed of a fuel electrode 26, a solid polymer electrolyte membrane 27 and an air electrode 28, and this electrode / membrane assembly is sandwiched between a first separator 24 and a second separator 25. Yes.

Fuel gas is supplied to the fuel electrode 26 from the main flow channel 10 of the first separator 24 to the electrode / membrane assembly. The cooling water passing through the soot channel 9 of the first separator 24 is also in contact with the fuel electrode 26, but the electrode base material of the fuel electrode 26 is subjected to water repellent treatment, and the cooling water is used as fuel. It does not flow through the electrode substrate of the pole 26.
On the other hand, air is supplied to the electrode / membrane assembly from the former channel 1 of the second separator 25 and then supplied again from the main channel 2 to the electrode / membrane assembly. In the main main channel 2, the generated water is supplied to the solid polymer electrolyte membrane 27 through the air electrode 28.

FIG. 12 shows another example of the fuel cell stack of the fourth embodiment. An electron conductive thin film 29 is provided between the electrode base material of the fuel electrode 26 and the separators 24 and 25, and the electron conductivity is shown. As shown in FIGS. 13 and 14, a large number of holes 30 are formed in the portion of the thin film 29 facing the fuel gas, and the fuel gas passes through the holes 30 of the electron conductive thin film 29 from the main flow passage 10. To the electrode base material of the fuel electrode 26.
As the electron conductive thin film 29, a flexible graphite sheet (trade name: GRAFOIL Sakai Kogyo Co., Ltd.) obtained by compressing expanded graphite to a thickness of about 0.1 mm is used with a hole 30 formed by pressing. Although desirable, a metal thin film having excellent corrosion resistance may be used.
Accordingly, the cooling water is blocked by the impermeable electron conductive thin film 29 and does not penetrate into the electrode base material of the fuel electrode 26.

In the case of the fuel cell shown in FIG. 11 in which the electrode base material of the fuel electrode 26 is subjected to water repellent treatment, the fuel cell can be applied when pure water is used as cooling water.
In the case of cooling water using an antifreeze liquid containing ethylene glycol or the like, ethylene glycol may permeate into the fuel electrode 26 to some extent and may adversely affect the electrode reaction. However, pure water is used as the cooling water. In this case, a part of the cooling water is evaporated and supplied to the fuel electrode 26, so that a humidification effect and a cooling effect can be obtained.
On the other hand, in the case of the fuel cell shown in FIG. 12 in which the electron conductive thin film 29 is provided between the fuel electrode 26 and the separators 24 and 25, ethylene glycol in the cooling water is replaced with the electron conductive thin film 29. This prevents the fuel electrode 26 from penetrating, and is particularly effective when an antifreeze is used as the cooling water.

  The diffusibility of hydrogen contained in the fuel gas is several times higher than that of oxygen contained in the air, and the hydrogen concentration in the fuel gas is also higher than that in the air. Accordingly, on the fuel electrode 26 side, as shown in this embodiment, every other main flow passage 10 that is the main flow passage for fuel gas and every other flow passage 9 that is the main flow passage for cooling water are arranged. Even so, the hydrogen is sufficiently supplied to the solid polymer electrolyte membrane 27.

Embodiment 5. FIG.
15 and 16 are schematic perspective views of a fuel cell stack configured by stacking 30 stages of cells configured using the separator of Embodiment 2 shown in FIGS. 3 to 5.
In this embodiment, air as fluid upper, air of fluid upper discharged from the upper outlet manifold 12 as fluid second, fuel gas as fluid soot, fuel of fuel soot discharged from the outlet outlet manifold 16 as fluid choke The case where it is cooling water as gas and a fluid tank is shown.
The air flow of the fluid upper and the fluid second is the same as that of the fuel cell stack of the fourth embodiment, and the description thereof is omitted.
After the fuel gas, which is a fluid soot, enters the soot inlet manifold 15 from the arrow 37 in FIG. 16 and is distributed and supplied to each single cell from the soot channel 9 of each separator of the second embodiment. , Assembled in the eaves outlet manifold 16 (see FIGS. 3 to 6).

As shown in FIG. 16, the slag outlet manifold 16 and the Dingle inlet manifold 17 are connected by a communication manifold 22, and the fuel gas, which is a fluid Ding, is redistributed from the Dinge inlet manifold 17 to each of them. After being supplied from the separator main flow channel 10 of the second embodiment to each single cell, the separators are gathered in the outlet manifold 18, flow in the direction indicated by the arrow 36, and are discharged to the outside.
That is, the fuel gas is also supplied to the single cell twice like the air, and the situation where the fuel gas is deficient and the carbon which is the material of the separator is corroded can be prevented.

Embodiment 6 FIG.
FIGS. 17 and 18 are schematic perspective views of a fuel cell stack formed by stacking 50 stages of cells configured using the separator of Embodiment 3 shown in FIGS. 7 and 8.
In this embodiment, fuel gas is used as the fluid upper, cooling water is used as the fluid end, air is used as the fluid end, and a fluid end discharged from the end outlet manifold 16 is used as the fluid end.
The fuel gas which is the fluid upper enters the upper inlet manifold 11 from the arrow 35 and is distributed and supplied to each single cell from the upper flow path 1 of the separator of the third embodiment. Collected in the manifold 12.
The cooling water which is the fluid second enters the second inlet manifold 13 from the arrow 37 and is distributed and supplied to each single cell from the second main flow path 2 of each separator of the third embodiment, and then the second outlet. Collected in the manifold 14.

Air, which is a fluid soot, enters the soot inlet manifold 15 from the arrow 33, is distributed and passes through the soot channel 9 of the separator of each cell, and then gathers in the soot outlet manifold 16.
As shown in FIG. 18, the slag outlet manifold 16 and the couch inlet manifold 17 are connected by a communication manifold 23, and the fluid gutter is redistributed from the couch inlet manifold 17 to each of the third embodiment. After passing through the main passage 10 for the separator (see FIGS. 7 and 8), the separator is gathered at the outlet manifold 18 and discharged to the outside according to the arrow 34. That is, air is supplied to the single cell twice.

  As described above, the flow of the air that is the fluid tank and the fluid flow is basically the same as that shown in the fourth embodiment, and the same effect as in the fourth embodiment can be obtained.

3 is a plan view of the front side of the fuel cell separator according to Embodiment 1. FIG. It is a top view of the back side of the separator for fuel cells of FIG. 5 is a plan view of the front side of one fuel cell separator according to Embodiment 2. FIG. It is a top view of the back side of the separator for fuel cells of FIG. 6 is a plan view of the front side of the other fuel cell separator according to Embodiment 2. FIG. It is a top view of the back side of the separator for fuel cells of FIG. 6 is a plan view of the front side of a fuel cell separator according to Embodiment 3. FIG. It is a top view of the back side of the separator for fuel cells of FIG. 6 is a schematic perspective view of a fuel cell stack according to Embodiment 4. FIG. 6 is a schematic perspective view of a fuel cell stack according to Embodiment 4. FIG. 6 is a schematic cross-sectional view of a cell of a fuel cell stack according to Embodiment 4. FIG. FIG. 10 is a schematic cross-sectional view showing another example of cells of the fuel cell stack according to Embodiment 4. It is a top view which shows the electron conductive thin film of FIG. It is a top view which shows the other example of an electron conductive thin film. 10 is a schematic perspective view showing a fuel cell stack according to Embodiment 5. FIG. 10 is a schematic perspective view showing a fuel cell stack according to Embodiment 5. FIG. 10 is a schematic perspective view showing a fuel cell stack according to Embodiment 6. FIG. 10 is a schematic perspective view showing a fuel cell stack according to Embodiment 6. FIG.

Explanation of symbols

  1 A-side flow path, 2 B main flow path, 3a B-side inlet through hole, 3b B-side outlet through-hole, 4a B-side inlet sub-flow path, 4b B-side outlet sub-flow path, 5a Ding-type inlet through-hole, 5b Die outlet through-hole, 6a Ding inlet sub-channel, 6b Ding outlet sub-channel, 7 Cage channel, 9 Cage channel, 10 Ding main channel, 11 A inlet manifold, 12 A outlet Manifold, 13 B inlet manifold, 14 B outlet manifold, 15 mm inlet manifold, 16 mm outlet manifold, 17 mm inlet manifold, 18 mm outlet manifold, 19 mm inlet manifold, 20 mm outlet manifold, 26 Fuel electrode, 27 Solid polymer electrolyte membrane, 28 Air electrode, 29 Electron conductive thin film, 30 holes.

Claims (9)

A groove-shaped upper channel that is formed by being folded several times on the surface of the main body and through which the fluid upper flows,
A groove-shaped main channel for the groove formed in the surface along with the channel for the former and through which the fluid channel flows,
An inlet manifold formed through the peripheral edge of the main body and connected to one end of the upper channel, and an outlet manifold connected to the other end of the upper channel;
A second inlet manifold formed through the peripheral edge of the main body, and a second outlet manifold;
A groove-shaped inlet inlet sub-flow channel formed on the back surface at the peripheral edge of the main body and connected to the inlet inlet manifold through the inlet inlet through hole;
A groove-shaped outlet outlet sub-flow passage formed on the back surface at the peripheral edge of the main body and connected to the outlet outlet manifold through the outlet outlet through hole;
A fuel cell separator comprising: Furthermore, a groove-like flow channel for a groove that is formed by being bent back and forth on the back surface of the main body,
A groove-shaped main passage for a groove formed on the back surface along with the flow passage for ridges, and through which a fluid ditch flows;
A soot inlet manifold formed through the peripheral edge of the main body and connected to one end of the soot channel, and a soot outlet manifold connected to the other end of the soot channel,
An inlet manifold for the dig formed through the peripheral edge of the main body, and an outlet manifold for the dig,
A groove-shaped inlet sub-flow passage formed on the surface at the peripheral edge of the main body and connected to the inlet manifold for the hook through the inlet opening for the hook;
2. The fuel cell fuel cell according to claim 1, further comprising: a groove-shaped outlet sub-flow channel formed on a surface at a peripheral edge portion of the main body and connected to the outlet manifold for the stopper through a stopper outlet through hole. Separator. A plurality of the inlet inlet through holes and the outlet outlet through holes are formed, and each of the inlet inlet through holes and the outlet outlet through holes are parallel to the side end surface of the main body. Arranged on a straight line,
In addition, a plurality of the Dingle inlet through-holes and the Dinge outlet through-holes are formed, and the Dinge inlet through-holes and the Dinge outlet through-holes are formed on the side end surfaces of the main body. The fuel cell separator according to claim 2, which is arranged in parallel and on a straight line. A cell constituted by sandwiching both surfaces of an electrode / membrane assembly comprising an air electrode, a solid polymer electrolyte membrane, and a fuel electrode with the separator according to any one of claims 1 to 3 in a plurality of stages. A stacked fuel cell stack,
The fluid upper and the fluid second are oxidant gas, and the oxidant gas flowing in from the first inlet manifold is discharged from the first outlet outlet manifold through the first passage, Fuel discharged from the outlet manifold through the inlet manifold, the inlet inlet sub-channel, the inlet inlet through-hole, the outlet main passage, the outlet outlet through-hole, the outlet outlet auxiliary passage Battery stack. A fuel cell comprising a plurality of stacked cells each having both sides of an electrode / membrane assembly comprising an air electrode, a solid polymer electrolyte membrane, and a fuel electrode sandwiched by separators according to claim 2 or 3. A stack,
The fluid soot and the fluid choke are fuel gas, and the fuel gas that has flowed in from the soot inlet manifold is discharged from the soot outlet manifold through the soot passage, and then the soot inlet manifold. A fuel cell stack that is discharged from the outlet manifold through the couch inlet sub-flow path, the couch inlet through-hole, the cuff main flow path, the couch outlet through-hole, and the couch outlet sub-flow path . A fuel cell stack comprising a plurality of stacked cells each having both surfaces of an electrode / membrane assembly comprising an air electrode, a solid polymer electrolyte membrane and a fuel electrode sandwiched between separators according to claim 1. ,
The fuel shell is a fuel cell stack in which the fluid upper is fuel gas, and the fluid second is cooling water. A fuel cell stack comprising a plurality of cells stacked on both sides of an electrode / membrane assembly comprising an air electrode, a solid polymer electrolyte membrane, and a fuel electrode sandwiched between separators according to claim 2,
The fuel tank is a fuel cell stack in which the fluid tank is cooling water and the fluid is fuel gas.   The fuel cell stack according to claim 6 or 7, wherein the electrode base material of the fuel electrode is subjected to a water repellent treatment.   An electron conductive thin film having a hole in a region facing the fuel gas is provided between the electrode base of the fuel electrode and the separator, and the fuel gas is supplied to the electrode base through the hole. The fuel cell stack according to claim 6 or 7.

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