Fuel cell

Abstract

The objective of this invention is to miniaturize fuel cells. The fuel cell comprises at least one single-cell unit. Each single-cell unit comprises M (M is a positive integer) generators connected in series and N (N is M plus 1) manifold forming sections formed by non-conductive components. Each manifold forming section has through holes for the passage of anode gas, cathode gas, and cooling water, respectively. Within a single-cell unit, the M generators and N manifold forming sections are arranged in an alternating manner. In two adjacent generators sandwiching any manifold forming section, namely a first generator and a second generator, the anode electrode of the first generator is disposed on one side of the single-cell unit, and the cathode electrode of the first generator is disposed on the other side of the single-cell unit. The anode electrode of the second generator is disposed on the other side of the single-cell unit, and the cathode electrode of the second generator is disposed on one side of the single-cell unit.

Description

Technical Field

[0001] This invention relates to a fuel cell. Background Technology

[0002] As described in Patent Document 1, multiple single cell units are stacked in the fuel cell stack.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-152286 Summary of the Invention

[0004] The open-circuit voltage (OCV) of a single cell is around 1V, which is relatively low. Therefore, to increase the output voltage of the fuel cell stack, multiple single cells need to be stacked. The more single cells stacked, the larger the size of the fuel cell stack. Therefore, further improvements in fuel cell miniaturization are desired.

[0005] The present invention can be implemented in the following ways.

[0006] (1) According to one aspect of the present invention, a fuel cell is provided. The fuel cell includes at least one single cell unit, wherein the single cell unit includes M (M is a positive integer) power generators connected in series and N (N is the value of M plus 1) manifold forming portions formed by non-conductive components. The manifold forming portions include through holes for anode gas, cathode gas, and cooling water to pass through, respectively. In one single cell unit, the M power generators and the N manifold forming portions are arranged in an alternating manner. In two power generators adjacent to any manifold forming portion, namely a first power generator and a second power generator, the anode electrode of the first power generator is disposed on one side of the single cell unit, and the cathode electrode of the first power generator is disposed on the other side of the single cell unit. The anode electrode of the second power generator is disposed on the other side of the single cell unit, and the cathode electrode of the second power generator is disposed on the one side of the single cell unit. The flow path in the first power generator, disposed on one side and in contact with the anode electrode, and the flow path in the second power generator, disposed on the other side and in contact with the anode electrode, are connected via a through-hole in the manifold forming portion, which is sandwiched between the first power generator and the second power generator, for the passage of the anode gas. The flow path in the first power generator, disposed on the other side and in contact with the cathode electrode, and the flow path in the second power generator, disposed on one side and in contact with the cathode electrode, are connected via a through-hole in the manifold forming portion, which is sandwiched between the first power generator and the second power generator, for the passage of the cathode gas.

[0007] Based on the above method, it is possible to realize a structure in which multiple power generators are arranged on a two-dimensional plane and connected in series. By appropriately setting the number of power generators arranged, a fuel cell can be provided that generates electricity at the required voltage without increasing the number of battery cell stacks.

[0008] (2) In the fuel cell of the above manner, it can be configured as follows: after the anode gas flows through one side of the first power generator, it passes through the through hole of the manifold forming part arranged between the first power generator and the second power generator for the anode gas to pass through and faces the other side of the second power generator; after the cathode gas flows through the other side of the first power generator, it passes through the through hole of the manifold forming part arranged between the first power generator and the second power generator for the cathode gas to pass through and faces the other side of the second power generator.

[0009] (3) In the fuel cell of the above manner, the area occupied by the power generator located on the downstream side of the cathode gas in the single cell is set to be larger than the area occupied by the power generator located on the upstream side of the cathode gas, which is located further upstream than the downstream power generator.

[0010] According to the above method, since the cathode gas is consumed in the generator located upstream of the cathode gas flow path, the concentration of cathode gas supplied to the generator located downstream of the cathode gas flow path is typically dilute. Therefore, the current in the downstream generator is less than the current in the upstream generator. From the viewpoint of preventing early degradation of the fuel cell unit and stabilizing cell performance, it is preferable to make the current in each of the multiple generators connected in series uniform. Therefore, by increasing the area of ​​the downstream generator, it is possible to make the current in the upstream generator consistent with the current in the downstream generator. Attached Figure Description

[0011] Figure 1 This is an explanatory diagram showing the fuel cell unit involved in this embodiment in an exploded view.

[0012] Figure 2 This is an explanatory diagram of the main body of the battery cell.

[0013] Figure 3 This is an explanatory diagram of the separator.

[0014] Figure 4 It is an explanatory diagram showing the flow of gas. Detailed Implementation

[0015] A. Implementation method:

[0016] Figure 1 This is an explanatory diagram showing the fuel cell unit 10 according to this embodiment in exploded view. Figure 2 This is an explanatory diagram of the main body 100 of the battery cell. (See diagram below.) Figure 1 As shown, fuel cell unit 10 is a solid polymer fuel cell that accepts hydrogen and oxygen as reactant gases to generate electricity.

[0017] The fuel cell unit 10 includes a main body 100 and a pair of spacers 200. The main body 100 is sandwiched between the pair of spacers 200. Figure 1 In this design, one of the pair of separators 200 that overlaps with the main body 100 of the battery cell is designated as separator 201. The other separator 200 located below the main body 100 of the battery cell is designated as separator 202. The fuel cell unit 10 is also referred to as a "single battery unit".

[0018] Each separator 200 is made of, for example, stainless steel, titanium, or alloys thereof. In each separator 200, a groove 200g formed by stamping is provided in the area overlapping with MEGA111-113 of the battery cell body 100 (see reference). Figure 3 A flow path for anolyte gas or cathode gas is formed between the separator 201 and MEGA111-113 through a groove 200g provided in the separator 202. A flow path for anolyte gas or cathode gas is formed between MEGA111-113 and the separator 202 through a groove 200g provided in the separator 202.

[0019] like Figure 2 As shown, the main body 100 of the battery cell includes MEGAs 111-113, resin sheets 121-123 supporting each MEGA, manifold forming portions 131-134, and a sealing portion 140. MEGA stands for Membrane Electrode Gas Diffusion Layer Assembly. Hereinafter, MEGAs 111-113 are sometimes simply referred to as MEGA 110. Resin sheets 121-123 are sometimes simply referred to as resin sheets 120. Manifold forming portions 131-134 are sometimes simply referred to as manifold forming portions 130. MEGAs 111-113 are also referred to as "power generators".

[0020] The MEGA110 comprises a membrane electrode assembly (MEA) and a pair of gas diffusion layers. The MEA includes an electrolyte membrane, a catalyst layer serving as an anode electrode on one side of the electrolyte membrane, and a catalyst layer serving as a cathode electrode on the other side of the electrolyte membrane. The electrolyte membrane is, for example, an ion exchange membrane made of a fluorinated resin. Each catalyst layer is, for example, made of a carbon support carrying a platinum catalyst. One of the pair of gas diffusion layers overlaps with the catalyst layer serving as the anode electrode, and the other of the pair of gas diffusion layers overlaps with the catalyst layer serving as the cathode electrode. Each gas diffusion layer is, for example, made of carbon cloth.

[0021] The resin sheet 120 is a frame-shaped component that holds the MEGA 110. The outer periphery of the MEGA 110 is joined, for example, to the inner periphery of a through hole formed in the center of the resin sheet 120 by an adhesive (not shown). The MEGA 110 is exposed on both the surface and the back of the resin sheet 120.

[0022] The following description uses manifold forming section 131 as an example, but manifold forming sections 132 to 134 also have the same structure. Manifold forming section 131 is formed from a non-conductive component. For example, manifold forming section 131 is formed from polyphenylene sulfide (PPS), polyphenylene ether (PPE), polypropylene (PP), or polyethylene naphthalate (PEN). Manifold forming section 131 has through holes 131a, 131b, and 131c. Through hole 131a is used for the passage of anolyte gas. Through hole 131c is used for the passage of cathode gas. Through hole 131b is used for the passage of cooling water. Through holes 131a to 131c are arranged along the short side direction of the battery cell main body 100. In the illustrated example, the short side direction of the battery cell main body 100 is aligned with the Y-axis direction.

[0023] A through hole 131b is disposed in the middle of through holes 131a to 131c disposed along the short side direction of the battery cell body 100. Through hole 131a is disposed further towards the +Y side than through hole 131b, and through hole 131c is disposed further towards the -Y side than through hole 131b. In the manifold forming section 132, which sandwiches MEGA 111 and is adjacent to manifold forming section 131, through hole 132a is disposed further towards the -Y side than through hole 132b, and through hole 132c is disposed further towards the +Y side than through hole 132b. In the two manifold forming sections sandwiching one MEGA 110, the configuration of the through hole for anode gas in one manifold forming section 130 is opposite to that in the other manifold forming section 130. The configuration of the through hole for cathode is also the same.

[0024] The sealing part 140 includes an outer peripheral sealing part 140o, inner sealing parts 142i and 143i, and multiple hole sealing parts 140h.

[0025] The outer peripheral sealing portion 140o is disposed along the outer edge of the battery cell main body portion 100. The outer peripheral sealing portion 140o seals the flow path formed between the separator 201 and the battery cell main body portion 100 relative to the outside.

[0026] An internal seal 142i is disposed between MEGA111 and MEGA112. An internal seal 143i is disposed between MEGA112 and MEGA113. The internal seals 142i and 143i, together with the external seal 140o, are used to divide the flow path space for the anode gas flow or the flow path space for the cathode gas flow.

[0027] The hole sealing part 140h is configured to surround the corresponding through hole of the manifold forming part 130.

[0028] <Anode Gas Flow Path of MEGA111>

[0029] The anode electrode of MEGA111 is disposed on the upper surface side of fuel cell unit 10. The upper surface side of fuel cell unit 10 is... Figure 2 The +Z side is consistent. The lower surface side of the fuel cell unit 10 is consistent with... Figure 2 The -Z side is consistent. A flow path space for anolyte gas is formed between the separator 201 and MEGA111.

[0030] like Figure 2 As shown, the through holes 131b and 131c of the manifold forming portion 131 are sealed by the hole sealing portion 140h. The through hole 131b of the manifold forming portion 132 is sealed by the hole sealing portion 140h. The internal sealing portion 142i is used to separate the flow path space formed between the separator 201 and MEGA 111 and the flow path space formed between the separator 201 and MEGA 111. The internal sealing portion 142i is configured such that the through hole 132c of the manifold forming portion 132 is not included in the flow path space of the anolyte gas formed between the separator 201 and MEGA 111.

[0031] Thus, the through holes 131b and 131c of the manifold forming portion 131 and the through holes 132b and 132c of the manifold forming portion 132 are sealed. Therefore, cathode gas and cooling water are prevented from entering the flow path space formed between the separator 201 and MEGA 111.

[0032] <Cathode Gas Flow Path of MEGA112>

[0033] The cathode electrode of MEGA112 is disposed on the upper surface side of the fuel cell unit 10. A flow path space for cathode gas is formed between the separator 201 and MEGA112.

[0034] like Figure 2 As shown, the internal sealing portion 142i is configured such that the through holes 132a and 132b of the manifold forming portion 132 are not included in the flow path space of the cathode gas formed between the separator 201 and MEGA 112. The internal sealing portion 143i is used to separate the flow path space formed between the separator 201 and MEGA 112 and the flow path space formed between the separator 201 and MEGA 113. The internal sealing portion 143i is configured such that the through holes 133a and 133b of the manifold forming portion 133 are not included in the flow path space of the cathode gas formed between the separator 201 and MEGA 112.

[0035] Thus, the through holes 132a and 132b of the manifold forming portion 132 and the through holes 133a and 133b of the manifold forming portion 133 are sealed. Therefore, anolyte gas and cooling water are prevented from entering the flow path space formed between the separator 201 and MEGA 112.

[0036] <Anode Gas Flow Path of MEGA113>

[0037] The anode electrode of MEGA113 is disposed on the upper surface side of the fuel cell unit 10. A flow path space for anode gas is formed between the separator 201 and MEGA113.

[0038] like Figure 2 As shown, the through hole 133b of the manifold forming portion 133 is sealed by the hole sealing portion 140h. The through holes 134b and 134c of the manifold forming portion 134 are also sealed by the hole sealing portion 140h. The internal sealing portion 143i is used to separate the flow path space formed between the separator 201 and MEGA 112 and the flow path space formed between the separator 201 and MEGA 113. The internal sealing portion 143i is configured such that the through hole 133c of the manifold forming portion 133 is not included in the flow path space of the anolyte gas formed between the separator 201 and MEGA 113.

[0039] Thus, the through holes 133b and 133c of the manifold forming portion 133 and the through holes 134b and 134c of the manifold forming portion 134 are sealed. Therefore, cathode gas and cooling water are prevented from entering the flow path space formed between the separator 201 and MEGA 113.

[0040] Figure 3 This is an explanatory diagram of separator 202. (As shown...) Figure 3As shown, the separator 202 includes 12 through holes, grooves 200g, and sealing portions 240. Through holes 201a to 204a are positioned corresponding to the through holes 131a to 134a formed in manifold forming portions 131 to 134. Through holes 201b to 204b are positioned corresponding to the through holes 131b to 134b formed in manifold forming portions 131 to 134. Through holes 201c to 204c are positioned corresponding to the through holes 131c to 134c formed in manifold forming portions 131 to 134. Through holes 201a to 204a are used for the passage of anolyte gas. Through holes 201c to 204c are used for the passage of cathode gas. Through holes 201b to 204b are used for the passage of cooling water. Grooves 200g are formed in the areas of the separator 202 that overlap with MEGA111 to 113. Although not shown, like the partition 202, the partition 201 also has 12 through holes and slots.

[0041] The sealing part 240 includes an outer peripheral sealing part 240o, inner sealing parts 242i and 243i, and multiple hole sealing parts 240h.

[0042] The outer peripheral seal 240o is disposed along the outer edge of the separator 202. The outer peripheral seal 240o seals the flow path formed between the battery cell body 100 and the separator 202 relative to the outside. The inner seals 242i and 243i, together with the outer peripheral seal 240o, are used to divide the flow path space for anode gas flow or cathode gas flow. The hole seal 240h is configured to surround the corresponding through hole of the separator 202.

[0043] <Cathode Gas Flow Path of MEGA111>

[0044] The cathode electrode of MEGA111 is disposed on the lower surface side of fuel cell unit 10. A flow path space for cathode gas is formed between MEGA111 and separator 202.

[0045] The through holes 201a and 202b, located in the region overlapping with the manifold forming portion 131, are sealed by the hole sealing portion 240h. The internal sealing portion 242i is used to separate the flow path space formed between MEGA111 and the separator 202 and the flow path space formed between MEGA112 and the separator 202. The internal sealing portion 242i is configured such that the through holes 202a and 202b located in the region overlapping with the manifold forming portion 132 are not included in the flow path space of the cathode gas formed between MEGA111 and the separator 201.

[0046] Thus, the through holes 201a and 201b located in the region overlapping with the manifold forming portion 131 and the through holes 202a and 202b located in the region overlapping with the manifold forming portion 132 are sealed. Therefore, anolyte gas and cooling water are prevented from entering the flow path space formed between MEGA111 and the separator 202.

[0047] <Anode Gas Flow Path of MEGA112>

[0048] The anode electrode of MEGA112 is disposed on the lower surface side of fuel cell unit 10. A flow path space for anode gas is formed between MEGA112 and separator 202.

[0049] The through hole 202b, located in the region overlapping with the manifold forming portion 132, is sealed by the hole sealing portion 240h. The internal sealing portion 242i is configured to exclude the through hole 202c, located in the region overlapping with the manifold forming portion 132, from the flow path space of the anolyte gas formed between MEGA 112 and the separator 201. The internal sealing portion 243i serves to separate the flow path space formed between MEGA 112 and the separator 202 from the flow path space formed between MEGA 113 and the separator 202. The internal sealing portion 243i is configured to exclude the through hole 203c, located in the region overlapping with the manifold forming portion 133, from the flow path space of the anolyte gas formed between MEGA 112 and the separator 201.

[0050] Thus, the through holes 202b and 202c located in the region overlapping with the manifold forming portion 132 and the through holes 203b and 203c located in the region overlapping with the manifold forming portion 133 are sealed. Therefore, cathode gas and cooling water are prevented from entering the flow path space formed between MEGA112 and the separator 202.

[0051] <Cathode Gas Flow Path of MEGA113>

[0052] The cathode electrode of MEGA113 is disposed on the lower surface side of fuel cell unit 10. A flow path space for cathode gas is formed between MEGA113 and separator 202.

[0053] like Figure 3 As shown, the internal sealing portion 243i is configured such that the through holes 203a and 203b disposed in the region overlapping with the manifold forming portion 133 are not included in the flow path space of the cathode gas formed between MEGA113 and the separator 202. The through holes 204a and 204b disposed in the region overlapping with the manifold forming portion 134 are sealed by the hole sealing portion 240h.

[0054] Thus, the through holes 203a and 203b located in the region overlapping with the manifold forming portion 133 and the through holes 204a and 204c located in the region overlapping with the manifold forming portion 134 are sealed. Therefore, anolyte gas and cooling water are prevented from entering the flow path space formed between MEGA113 and the separator 202.

[0055] Figure 4 It is an explanatory diagram showing the flow of gas. In Figure 4 The diagram of separator 201 is omitted in the text.

[0056] First, the flow of the anode gas will be explained. Anode gas AG enters the flow path space formed between separator 201 and MEGA 111 through the through hole 131a of manifold forming section 131. Anode gas AG flows through the flow path space between separator 201 and MEGA 111, and then through the through hole 132a of manifold forming section 132 toward the lower surface of fuel cell unit 10. Then, anode gas AG enters the flow path space formed between MEGA 112 and separator 202 through the through hole 202a of separator 202. Anode gas AG flows through the flow path space between MEGA 112 and separator 202, and then through the through hole 203a of separator 202, which overlaps with manifold forming section 133, toward the upper surface of fuel cell unit 10. Anode gas AG enters the flow path space formed between separator 201 and MEGA 113 through the through hole 133a of manifold forming section 133. Anode gas AG is discharged through the through hole 134a via the flow path space formed between separator 201 and MEGA111. Additionally, Figure 4 The arrows shown indicate the gas inlet and outlet in the flow path space. In fact, the gas flows along the flow path formed by the groove 200g provided in the separator 200.

[0057] Next, the flow of the cathode gas will be described. The cathode gas CG enters the flow path space formed between MEGA 111 and the separator 202 through the through hole 201c overlapping with the manifold forming section 131. The cathode gas CG passes through the flow path space between MEGA 111 and the separator 202, and then through the through hole 202c of the separator 202 toward the upper surface of the fuel cell unit 10. Then, the cathode gas CG enters the flow path space formed between the separator 201 and MEGA 112 through the through hole 132c of the manifold forming section 132. The cathode gas CG passes through the flow path space between the separator 201 and MEGA 112, and then through the through hole 133c toward the lower surface of the fuel cell unit 10. The cathode gas CG enters the flow path space between MEGA 113 and the separator 201 through the through hole 203c of the separator 202 overlapping with the manifold forming section 133. The cathode gas CG is discharged from the through hole 204c through the flow path space formed between MEGA113 and the separator 201.

[0058] In this embodiment, within a single cell, M MEGAs (M being a positive integer) and N manifold forming sections (N being M plus 1) are arranged in an alternating manner of power generation and manifold forming sections. The anode and cathode electrodes of adjacent MEGAs are reversed. For example, in MEGAs 111 and 112 adjacent to each other sandwiching manifold forming sections 132, the flow path contacting the anode electrode of MEGA 111 and the flow path contacting the anode electrode of MEGA 112 are connected via a through hole 132a of manifold forming section 132. The flow path contacting the cathode electrode of MEGA 111 and the flow path contacting the cathode electrode of MEGA 112 are connected via a through hole 132c of manifold forming section 132. MEGA 111 is also referred to as the "first power generation body". MEGA 112 is also referred to as the "second power generation body".

[0059] Each MEGA 110 is adjacent to the manifold forming section 130, so two adjacent MEGAs 110 are not electrically connected to each other. Therefore, it is possible to configure a structure in which three MEGAs are electrically connected in series. Thus, a structure in which multiple MEGAs are arranged on a two-dimensional plane and electrically connected in series can be realized within a single cell unit. Therefore, by appropriately setting the number of MEGAs arranged, a fuel cell that generates electricity at the required voltage can be provided without increasing the number of cell stacks. Compared with the conventional structure of stacking multiple single cell units, the size of the fuel cell can be made more compact.

[0060] B. Other implementation methods:

[0061] (B1) The area occupied by the MEGA110 located on the downstream side of the cathode gas in a single cell can be set to be larger than the area occupied by other MEGA110 located on the upstream side of the cathode gas. For example, the area of ​​MEGA113 can be set to be larger than the area of ​​MEGA111. MEGA111 is also referred to as the "upstream-side generator". MEGA113 is also referred to as the "downstream-side generator".

[0062] Since cathode gas is consumed in the MEGA located upstream of the cathode gas flow path, the concentration of cathode gas supplied to the downstream MEGA located downstream of the cathode gas flow path is typically dilute. Therefore, the current in the downstream MEGA is less than the current in the upstream MEGA. From the viewpoint of preventing early degradation of the fuel cell unit and stabilizing cell performance, it is preferable to make the current in each of the multiple MEGAs connected in series uniform. Therefore, by increasing the area of ​​the downstream MEGA, it is possible to make the current in the upstream MEGA consistent with the current in the downstream MEGA.

[0063] (B2) In Figure 1 The fuel cell unit 10 shown includes a structure with three MEGAs, but the number of MEGAs in the fuel cell unit 10 can be arbitrarily changed. Furthermore, multiple MEGAs can also be incorporated. Figure 1 The fuel cell units 10 shown are stacked to form a fuel cell.

[0064] (B3) In the above embodiment, an example of the battery cell main body 100 having 3 MEGAs was described, but the number of MEGAs provided by the battery cell main body 100 only needs to be at least 2, and can be set to any number.

[0065] This invention is not limited to the embodiments described above, and can be implemented in various structures without departing from its spirit. For example, appropriate substitutions or combinations can be made to achieve some or all of the technical features of the embodiments corresponding to the technical features described in the summary section of the invention to solve the above-mentioned problems, or to achieve some or all of the above-mentioned effects. Furthermore, if the technical features are not essential to the description in this specification, they can be appropriately deleted.

[0066] Symbol Explanation

[0067] 10 - Fuel cell unit; 100 - Battery unit body; 120, 121-123 - Resin sheets; 130, 131-134 - Manifold forming parts; 131a, 131b, 131c - Through holes; 132a, 132b, 132c - Through holes; 133a, 133b, 133c - Through holes; 134a, 134b, 134c - Through holes; 140 - Sealing part; 140h - Hole sealing part; 140o - Outer peripheral sealing part 142i, 143i - Internal sealing part; 200, 201, 202 - Separator; 200g - Groove; 201a, 201b, 201c - Through hole; 202a, 202b, 202c - Through hole; 203a, 203b, 203c - Through hole; 204a, 204b, 204c - Through hole; 240 - Sealing part; 240h - Hole sealing part; 240o - Outer peripheral sealing part; 242i, 243i - Internal sealing part.

Claims

1. A fuel cell comprising at least one single cell unit, characterized in that, The single-cell unit has M (M is a positive integer) power generating elements connected in series and N (N is the value of M plus 1) manifold forming sections formed by non-conductive components. The manifold forming section has through holes for the passage of anolyte gas, cathode gas, and cooling water, respectively. Within a single battery cell, M power generators and N manifold forming sections are arranged in an alternating manner. In the two adjacent power generators, namely the first power generator and the second power generator, sandwiching any of the manifold forming portions, The anode electrode of the first power generator is disposed on one side of the single cell unit, and the cathode electrode of the first power generator is disposed on the other side of the single cell unit. The anode electrode of the second power generator is disposed on the other side of the single cell unit, and the cathode electrode of the second power generator is disposed on one side of the single cell unit. The flow path in the first power generator, disposed on one side and in contact with the anode electrode, and the flow path in the second power generator, disposed on the other side and in contact with the anode electrode, are connected via a through hole in the manifold forming portion, which is sandwiched between the first power generator and the second power generator, for the passage of the anode gas. The flow path in the first power generator that is disposed on the other side and contacts the cathode electrode, and the flow path in the second power generator that is disposed on the one side and contacts the cathode electrode, are connected via the through hole of the manifold forming portion, which is disposed between the first power generator and the second power generator, for the passage of the cathode gas.

2. The fuel cell according to claim 1, characterized in that, The structure is as follows: After the anode gas flows through one side of the first power generator, it passes through a through hole in the manifold forming portion, which is sandwiched between the first and second power generators, toward the other side of the second power generator. After the cathode gas flows through the other side of the first power generator, it passes through the through hole of the manifold forming portion, which is arranged between the first power generator and the second power generator, toward the one side of the second power generator.

3. The fuel cell according to claim 2, characterized in that, The area occupied by the power generator located on the upstream side of the cathode gas in the single cell cell is set to be larger than the area occupied by the power generator located on the upstream side of the cathode gas, which is located further upstream than the downstream power generator.

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