JP2020119850A - Fuel cell - Google Patents

Abstract

To provide a fuel cell in which performance degradation of a fuel battery cell, located in the vicinity of a fuel gas introduction port, can be inhibited.SOLUTION: A fuel cell includes multiple laminated fuel battery cells 103, an injector 106 for supplying fuel gas to fuel battery cells, and a fuel gas circulation pump 105 for circulating fuel gas in order to supply fuel gas, discharged from the fuel battery cells, again to the fuel battery cells 103. In multiple fuel battery cells, a fuel gas supply passage 110 is formed to extend in the lamination direction Z of the fuel battery cells, the injector jets fuel gas toward the fuel gas supply passage, the injection direction is set in the lamination direction, and a confluent part 127 of the fuel gas circulated by the fuel gas circulation pump and the fuel gas supplied by the injector is provided on the upstream side of the fuel battery cells, and on the downstream side of the injector.SELECTED DRAWING: Figure 4

Description

The present invention relates to fuel cells.

A fuel cell has a stack structure in which a plurality of fuel cells, which are one unit of power generation, are stacked, and end plates are provided at both ends in the stacking direction (for example, see Patent Document 1). The end plate has a fuel gas inlet for introducing a fuel gas, a fuel gas outlet for discharging a fuel gas, an oxidizing gas inlet for introducing an oxidizing gas, and an oxidizing gas for discharging. And an oxidant gas exhaust port are provided. The fuel gas discharged from the fuel gas outlet includes the fuel gas not used for power generation by the fuel cell unit. Therefore, in order to effectively utilize the fuel gas, the fuel gas discharged from the fuel gas outlet is circulated by the fuel gas circulation pump, and the circulated fuel gas is also fueled with the fuel gas supplied from the fuel tank. The technology to supply to is known.

JP, 2003-338305, A

However, when the fuel gas is circulated by the fuel gas circulation pump, not only the fuel gas but also liquid water (generated water) generated by power generation and cation contaminants that are impurities eluted in the liquid water are also circulated. It When liquid water containing such impurities is supplied to the fuel cell, the fuel cell deteriorates. Further, when the fuel gas is circulated by the fuel gas circulation pump, the liquid water that circulates together with the fuel gas is concentratedly supplied to the fuel cells arranged near the fuel gas inlet. For this reason, the fuel cells near the fuel gas inlet are significantly deteriorated as compared with other fuel cells.

The present invention has been made to solve the above problems, and an object thereof is to provide a fuel cell capable of suppressing remarkable deterioration of a fuel battery cell arranged near a fuel gas inlet. is there.

The fuel cell according to the present invention includes a plurality of stacked fuel cells, an injector for supplying a fuel gas to the fuel cell, and a fuel gas discharged from the fuel cell to the fuel cell again. And a fuel gas circulation pump that circulates the fuel gas, a plurality of fuel cells are provided with a fuel gas supply passage extending in the stacking direction of the fuel cells, and the injector is directed toward the fuel gas supply passage. While injecting the fuel gas, the injection direction is set along the stacking direction, and the confluence portion of the fuel gas circulated by the fuel gas circulation pump and the fuel gas supplied by the injector is located upstream of the fuel cell unit. And on the downstream side of the injector.

The fuel cell according to the present invention further comprises an end plate arranged on one side in the stacking direction, and a manifold arranged between the end plate and the fuel cell in the stacking direction, and the manifold is a fuel gas circulation pump. It may have a gas flow path for flowing the fuel gas sent out by in a direction different from the stacking direction, and a merging portion may be provided at an end of the gas flow path.

In the fuel cell according to the present invention, the gas passages of the manifold may be formed obliquely so that the side of the merging portion is higher than the opposite side.

The fuel cell according to the present invention is equipped with an end plate arranged on one side in the stacking direction, an injector, an injector block attached to the end plate, a gas connecting the fuel gas circulation pump and the injector block. A flow passage forming portion is further provided, and the confluence portion is provided inside the injector block.

In the fuel cell according to the present invention, the gas introduction flow path from the injector to the confluence portion may be provided with a reduced diameter portion that causes cavitation in the liquid flowing into the confluence portion.

According to the present invention, it is possible to suppress remarkable deterioration of the fuel cells arranged near the fuel gas inlet.

It is a schematic perspective view showing a configuration of a fuel cell according to the first embodiment of the present invention. It is a schematic perspective view which shows the structure of the fuel cell unit used for the fuel cell of FIG. It is a schematic front view which shows the structure of the manifold used for the fuel cell of FIG. FIG. 2 is a cross-sectional view showing how the injector is mounted in the fuel cell of FIG. 1. It is a cross-sectional view showing a part of the fuel cell of FIG. FIG. 2 is a vertical cross-sectional view showing a mounted state of a fuel gas circulation pump in the fuel cell of FIG. 1. It is a cross-sectional view showing a main part of a fuel cell according to a second embodiment of the present invention. It is a schematic perspective view which shows the structure of the fuel cell which concerns on 3rd Embodiment of this invention. FIG. 9 is a cross-sectional view showing how the injector is mounted in the fuel cell of FIG. 8.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same elements or elements having the same function will be denoted by the same reference symbols, without redundant description.

<First Embodiment>
FIG. 1 is a schematic perspective view showing the configuration of the fuel cell according to the first embodiment of the present invention.
As shown in FIG. 1, the fuel cell 100 is a polymer electrolyte fuel cell, and includes a first end plate 101, a manifold 102 disposed adjacent to the first end plate 101, and a stack structure. It has a plurality of fuel cells 103 which it has, and the 2nd end plate 104 arranged at the end opposite to the 1st end plate 101. The first end plate 101, the manifold 102, the fuel cell 103, and the second end plate 104 are each formed in a rectangular shape when viewed from the front direction. Further, the fuel cell 100 includes a fuel gas circulation pump 105 for circulating the fuel gas, an injector 106 for supplying the fuel gas to the fuel cell 103, and an injector block 107 on which the injector 106 is mounted. There is.

The first end plate 101 and the second end plate 104 are arranged at both ends of the fuel cell 100. The first end plate 101 and the second end plate 104 are arranged so as to sandwich the manifold 102 and the plurality of fuel cell units 103 from both sides. The manifold 102 is sandwiched between the first end plate 101 and the fuel cell 103.

The fuel cells 103 are stacked in the Z direction (hereinafter, also referred to as “stacking direction”). The fuel cell 100 is mounted on a moving body such as a vehicle so that the stacking direction Z of the fuel cell 103 is horizontal. The fuel cell 100 is configured by stacking a large number of fuel cells 103. The number of stacked fuel cells 103 is set according to the voltage or output required for the fuel cell 100.

The fuel battery cell 103 constitutes a unit fuel battery cell which is one unit of power generation. Although not shown, the fuel cell 103 has a structure in which both sides of the electrolyte membrane are sandwiched by two separators. A cathode electrode is arranged on one surface of the electrolyte membrane, and an anode electrode is arranged on the other surface of the electrolyte membrane. In the following description, the vertical direction will be referred to as the Y direction, and the direction orthogonal to this Y direction will be referred to as the X direction, based on the state where the fuel cell 100 is mounted on the moving body. In this case, the X direction corresponds to the width direction of the fuel cell 100, and the Y direction corresponds to the height direction of the fuel cell 100.

As shown in FIG. 2, the fuel cell 103 has a fuel gas supply channel 110, a fuel gas exhaust channel 112, an oxidizing gas supply channel 114, an oxidizing gas exhaust channel 116, and a cooling medium supply stream. The passage 118 and the cooling medium discharge passage 120 are provided so as to penetrate in the stacking direction Z, respectively.

The fuel gas supply passage 110 serves as a gas passage for supplying the fuel gas to the fuel cell 103. The fuel gas discharge flow path 112 serves as a flow path for flowing the fuel gas discharged from the fuel cell 103. Hydrogen gas is used as the fuel gas. The fuel gas is supplied to the anode electrode (not shown) of the fuel cell 103 through the fuel gas supply channel 110.

The oxidizing gas supply channel 114 serves as a channel for supplying the oxidizing gas to the fuel cell 103. The oxidizing gas discharge passage 116 serves as a passage for flowing the oxidizing gas discharged from the fuel cell 103. Air is used as the oxidizing gas. The oxidizing gas is supplied to the cathode electrode (not shown) of the fuel cell unit 103 through the oxidizing gas supply channel 114.

The cooling medium supply passage 118 serves as a passage for supplying the cooling medium to the fuel cell 103. The cooling medium discharge channel 120 serves as a channel for flowing the cooling medium discharged from the fuel cell 103. Cooling water is used as the cooling medium.

Although not shown in FIG. 1, the fuel cell 100 may be provided with an insulator plate (not shown) for insulation and a terminal plate (not shown) for taking out the generated electric power. The insulator plate and the terminal plate are respectively arranged between the first end plate 101 and the fuel cell 103 and between the fuel cell 103 and the second end plate 104.

The fuel gas circulation pump 105 circulates the fuel gas discharged from the fuel cell 103 to supply the fuel gas to the fuel cell 103 again, and is attached to the outer surface of the first end plate 101. The fuel gas circulation pump 105 pumps and circulates the fuel gas (hydrogen) not used for power generation by the fuel cell 103 in the fuel cell 100, that is, the off gas. The fuel gas circulation pump 105 is driven by a drive pump motor (not shown).

Next, the structure of the manifold used in the fuel cell of FIG. 1 will be described with reference to FIGS. FIG. 3 is a schematic front view of the manifold, showing a case where the manifold 102 is viewed from the first end plate 101 side. Further, in FIG. 3, notation of the gas flow path formed in the manifold 102 for flowing the oxidizing gas is omitted, and the position of the fuel gas circulation pump 105 is shown by a two-dot chain line. Note that FIG. 4 shows a cross section in the Z direction of the fuel cell 100 at the position IV-IV in FIG. 5 shows a Z-direction cross section of the fuel cell 100 at the VI position of FIG. 3, and FIG. 6 shows a Z-direction cross section of the fuel cell 100 at the VI-VI position of FIG.

The manifold 102 is made of resin. In the manifold 102, a first gas flow channel 125 and a second gas flow channel 126 are formed. These gas flow paths 125 and 126 are formed on one surface of the manifold 102 facing the fuel cell 103. Each of the gas flow channels 125 and 126 is formed at a predetermined depth from one surface of the manifold 102. The fuel gas supply passage 110 of the fuel cell 103 is arranged in communication with one end of the first gas passage 125, and the circulation gas discharge passage 135 connected to the fuel gas circulation pump is provided at the other end. It is placed in communication. On the other hand, one end of the second gas flow passage 126 is arranged to communicate with the fuel gas discharge flow passage 112 of the fuel cell 103, and the other end thereof is connected to the introduction flow passage 136 of the fuel gas circulation pump. Are arranged.

The first gas flow path 125 is a flow path for flowing the fuel gas delivered by the fuel gas circulation pump 105 in the plane direction of the manifold 102, that is, in the direction orthogonal to the stacking direction Z. A merging portion 127 is provided at the end of the first gas flow channel 125. The first gas flow channel 125 is formed in an inclined state so that the side of the confluence portion 127 is higher than the opposite side (the side of the circulating gas introduction flow channel 135). The second gas channel 126 is a channel for flowing the fuel gas discharged from the fuel cell unit 103 in the plane direction of the manifold 102, that is, in the direction orthogonal to the stacking direction Z. The second gas flow passage 126 is formed in an inclined state so that the fuel gas discharge flow passage 112 side is lower than the opposite side (circulating gas discharge flow passage 136 side).

Further, a fuel gas delivery passage 130 is formed in the manifold 102 as shown in FIG. The fuel gas delivery channel 130 is formed along the stacking direction Z. The fuel gas delivery channel 130 is formed so as to communicate with the merging portion 127. The merging portion 127 is a portion where the fuel gas delivered by the fuel gas circulation pump 105 and the fuel gas supplied by the injector 106 join together. The merging portion 127 is provided on the upstream side of the fuel cell 103 in the stacking direction Z. Then, in a state where the first end plate 101, the manifold 102 and the fuel cell 103 are stacked in the Z direction, the fuel gas delivery passage 130 communicates with the fuel gas supply passage 110 via the first gas passage 125. Will be placed. A fuel gas delivery channel 129 is formed in the first end plate 101. The fuel gas delivery passage 129 is arranged in communication with the fuel gas delivery passage 130.

The fuel gas delivery passage 129, the fuel gas delivery passage 130, and the fuel gas supply passage 110 form one gas introduction passage 128 extending in the stacking direction Z. The gas introduction flow path 128 is a gas flow path for introducing the fuel gas into each of the fuel cells 103 forming the stack structure. The fuel gas delivery passage 129 and the fuel gas delivery passage 130 are passages for flowing the fuel gas delivered by the injector 106. In the flow direction of the gas in the gas introduction channel 128, the fuel gas delivery channel 129 is arranged upstream of the fuel gas delivery channel 130, and the fuel gas supply channel 110 is downstream of the fuel gas delivery channel 130. It is located in.
Further, as shown in FIG. 6, the manifold 102 is provided with a circulation gas introduction flow channel 135 and a circulation gas discharge flow channel 136. The circulating gas introducing passage 135 and the circulating gas discharging passage 136 are formed along the stacking direction Z, respectively. The circulating gas introduction flow channel 135 is formed in communication with the first gas flow channel 125, and the circulating gas discharge flow channel 136 is formed in communication with the second gas flow channel 126.

The circulating gas introducing passage 135 serves as a gas passage for introducing the gas sent from the fuel gas circulating pump 105 into the first gas passage 125. As shown in FIG. 6, the circulation gas introduction flow channel 135 is formed so as to communicate with the circulation gas supply flow channel 137 of the first end plate 101. The circulating gas supply flow path 137 is formed so as to penetrate the first end plate 101 in the stacking direction Z. A gas discharge port (not shown) of the fuel gas circulation pump 105 is connected to the circulation gas supply passage 137.

The circulation gas discharge flow passage 136 serves as a gas flow passage for discharging the gas flowing from the fuel gas discharge flow passage 112 to the second gas flow passage 126 toward the fuel gas circulation pump 105. As shown in FIG. 6, the circulating gas discharge passage 136 is formed so as to communicate with the circulating gas intake passage 138 of the first end plate 101. The circulating gas intake passage 138 is formed so as to penetrate the first end plate 101 in the stacking direction Z. The circulating gas intake passage 138 is connected to a gas inlet (not shown) of the fuel gas circulation pump 105. Further, the first end plate 101 is formed with a fuel gas delivery passage 129, a fuel gas delivery passage 130, and a fuel gas inlet 131 (see FIG. 4) communicating with the fuel gas supply passage 110. The introduction port 131 opens on the outer surface of the first end plate 101.

The injector 106 is mounted on the injector block 107. The injector block 107 is a block for mounting the injector, and is mounted on the outer surface 101 a of the first end plate 101. Inside the injector block 107, a gas flow path 132 (see FIG. 4) communicating with the fuel gas delivery flow path 129 via the fuel gas inlet 131 is formed. The gas flow passage 132 is formed coaxially with the gas introduction flow passage 128.

The injector 106 supplies the fuel gas fed from a fuel gas tank (not shown) to each fuel cell 103 through the fuel gas delivery passage 129, the fuel gas delivery passage 130 and the fuel gas supply passage 110. Fuel gas is sent to the injector 106 from the P direction in FIG. The injector 106 is an electronically controlled injector, and injects fuel gas by opening and closing the injector valve for a very short time.

The injection direction of the fuel gas by the injector 106 is set along the stacking direction Z. Specifically, when the injector 106 injects fuel gas in the direction of the central axis of the injector valve, the central axis of the injector valve is the fuel gas delivery passage 129, the fuel gas delivery passage 130, and the fuel gas supply passage 110. The injectors 106 are mounted on the injector block 107 so as to be arranged parallel to and coaxial with the respective central axes of, or arranged in a state close thereto. As a result, the fuel gas injected by the injector 106 is sent to the downstream side along each of the fuel gas delivery passage 129, the fuel gas delivery passage 130, and the fuel gas supply passage 110. There is.

Next, the operation of the fuel cell according to the first embodiment of the present invention will be described.
First, the fuel gas sent to the injector 106 from a fuel gas tank (not shown) is injected by the injector 106. At this time, the injector 106 injects the fuel gas toward the fuel gas supply passage 110. As a result, the fuel gas injected by the injector 106 flows into the fuel gas supply passage 110 through the gas passage 132, the fuel gas delivery passage 129, and the fuel gas delivery passage 130. Therefore, the fuel gas is supplied to each fuel cell 103. Further, the oxidizing gas is supplied to each of the fuel cells 103 through a route different from the fuel gas supply route. When the fuel gas and the oxidizing gas are supplied to the fuel cell 103 in this manner, the fuel cell 103 generates power by the electrochemical reaction between the fuel gas and the oxidizing gas.

Then, the off gas (fuel gas) that has not been used for power generation in the fuel cell unit 103 flows from the fuel gas discharge flow channel 112 into the second gas flow channel 126, as indicated by arrow A in FIG. The off gas flowing into the second gas flow passage 126 flows through the second gas flow passage 126 from the lower side to the higher side, as indicated by an arrow B in FIG. 3. Further, the off-gas that has flowed through the second gas flow passage 126 flows into the circulating gas discharge flow passage 136 that communicates with the higher end of the second gas flow passage 126. The off-gas flowing into the circulating gas discharge passage 136 is taken into the fuel gas circulation pump 105 from the circulating gas discharge passage 136 through the circulating gas intake passage 138 as shown by an arrow C in FIG.

The off-gas thus taken into the fuel gas circulation pump 105 is sent to the circulation gas supply passage 137 by the fuel gas circulation pump 105. The off gas sent to the circulating gas supply passage 137 flows into the first gas passage 125 through the circulating gas introduction passage 135 as shown by an arrow D in FIG. The off gas flowing into the first gas flow channel 125 flows through the first gas flow channel 125 from the lower side to the higher side, as indicated by an arrow E in FIG.

Here, when liquid water is discharged together with the fuel gas from the fuel gas discharge passage 112 of the fuel cell 103 and impurities are eluted in the liquid water, the liquid water containing impurities is wound up by the fuel gas circulation pump 105. It is conceivable that the gas flows into the merging portion 127 together with the off gas. In such a case, the liquid water flowing into the merging portion 127 is carried to the inner side of the gas introduction flow channel 128 by using the propulsive force of the fuel gas injected by the injector 106. As a result, liquid water containing impurities can be diffused widely in the stacking direction Z of the fuel cell 103. For this reason, liquid water is not concentratedly supplied to the fuel cells 103 arranged near the fuel gas inlet 131, particularly to the fuel cells 103 arranged next to the manifold 102. Therefore, it is possible to suppress the phenomenon in which the deterioration of the fuel cell 103 arranged near the fuel gas inlet 131 occurs more significantly than that of other fuel cells.

Further, in the first embodiment, the first gas passage 125 of the manifold 102 is formed obliquely. For this reason, as shown in FIG. 3, even if liquid water 133 generated due to dew condensation in the manifold 102 exists in the first gas flow passage 125, for example, this liquid water 133 will not flow through the first gas flow passage 125. It is returned to the lower side according to the inclination of. Therefore, it is possible to prevent the liquid water 133 from reaching the merging portion 127.

<Second Embodiment>
Subsequently, a second embodiment of the present invention will be described.
FIG. 7 is a cross-sectional view showing the main parts of the fuel cell according to the second embodiment of the present invention.
The second embodiment of the present invention is different from the first embodiment described above in that a reduced diameter portion 139 is provided in the gas introduction flow path 128 from the injector 106 to the confluence portion 127. The reduced diameter portion 139 is formed by gradually reducing the inner diameter of the fuel gas delivery passage 129 formed in the first end plate 101 from the upstream side to the downstream side of the gas introduction passage 128. ..

The reduced diameter portion 139 is for generating cavitation in the liquid flowing into the confluence portion 127 through the first gas flow passage 125. The cavitation described here forms a high-speed gas flow by narrowing down a part of the gas introduction flow channel 128, and sprays this gas flow onto the liquid flowing into the confluence portion 127, whereby liquid particles are generated. This is a phenomenon in which the particles are subdivided into multiple particles smaller than the original size.

In the second embodiment of the present invention, the fuel gas injected by the injector 106 is accelerated when passing through the reduced diameter portion 139 of the fuel gas delivery passage 129. The gas flow of the fuel gas that has been sped up is sprayed onto the liquid water when the liquid water flows into the merging portion 127 through the first gas flow path 125. As a result, the liquid water particles are subdivided. Therefore, the liquid water can be diffused in a wider range with respect to the plurality of fuel cells 103 stacked in the stacking direction Z. Further, the liquid water can be more uniformly diffused into each fuel cell 103.

<Third Embodiment>
FIG. 8 is a schematic perspective view showing the configuration of the fuel cell according to the third embodiment of the present invention.
As shown in FIG. 8, a fuel gas circulation pump 105 and an injector block 107 are attached to the outer surface of the first end plate 101. The fuel gas circulation pump 105 and the injector block 107 are connected by a gas pipe 141. The gas pipe 141 constitutes a gas flow path forming portion. One end of the gas pipe 141 is connected to a gas discharge port (not shown) of the fuel gas circulation pump 105. The gas pipe 141 is a pipe for supplying the fuel gas delivered by the fuel gas circulation pump 105 to the injector block 107.

As shown in FIG. 9, inside the injector block 107, a gas flow path 132a and a gas flow path 132b are formed. The gas passage 132a communicates with the fuel gas delivery passage 129 via the fuel gas inlet 131. Further, the gas flow passage 132a forms one gas introduction flow passage 128 together with the fuel gas delivery passage 129, the fuel gas delivery passage 130 and the fuel gas supply passage 110.

On the other hand, the end of the gas pipe 141 is connected to the gas flow path 132b. The gas passage 132b is a passage for flowing the fuel gas supplied from the fuel gas circulation pump 105 through the gas pipe 141 toward the gas passage 132a. The gas flow path 132b is connected to the gas flow path 132a inside the injector block 107. Inside the injector block 107, a merging portion 145 is provided at a connecting portion between the gas flow passage 132a and the gas flow passage 132b.

In the third embodiment of the present invention, the fuel gas sent to the injector 106 from the fuel gas tank (not shown) is injected by the injector 106 in the stacking direction Z. At this time, the fuel gas vigorously flows through the gas flow path 132 a of the injector block 107 by receiving the propulsive force generated by the injection of the injector 106. On the other hand, the off gas taken into the fuel gas circulation pump 105 is sent to the gas pipe 141 by the fuel gas circulation pump 105. The off gas sent to the gas pipe 141 flows into the merging portion 145 through the gas flow path 132b of the injector block 107. The off-gas that has flowed into the merging portion 145 merges with the fuel gas supplied by the injector 106 and flows into the downstream side of the gas introduction flow channel 128 together with the fuel gas.

At that time, it is conceivable that liquid water containing impurities is wound up by the fuel gas circulation pump 105 and flows into the merging portion 145 together with the off gas. In such a case, the liquid water that has flowed into the merging portion 145 is carried to the inner side of the gas introduction flow channel 128 by using the propulsive force of the fuel gas injected by the injector 106. As a result, liquid water containing impurities can be diffused widely in the stacking direction Z of the fuel cell 103. Therefore, it is possible to suppress a phenomenon in which the deterioration of the fuel battery cells 103 arranged near the fuel gas inlet 131 of the first end plate 101 occurs more significantly than that of other fuel battery cells.

In the third embodiment, the fuel gas sent out by the fuel gas circulation pump 105 is made to flow into the merging portion 145 through the gas pipe 141 and the gas flow path 132b, and therefore the first manifold 102 is provided. It is not necessary to provide the gas passage 125 and the circulating gas introduction passage 135.

<Modifications, etc.>
The technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications and improvements as long as a specific effect obtained by the constituent features of the invention or a combination thereof can be derived.

For example, in the above-described second embodiment, an example in which the fuel gas delivery passage 129 is provided with the reduced diameter portion 139 has been shown, but the present invention is not limited to this, and the fuel gas delivery passage 130 is provided with the reduced diameter portion 139. It may be provided. Further, the configuration having the reduced diameter portion is also applicable to the third embodiment.

100 Fuel Cell, 101 First End Plate (End Plate), 102 Manifold, 103 Fuel Cell, 105 Fuel Gas Circulation Pump, 106 Injector, 107 Injector Block, 110 Fuel Gas Supply Flow Path, 125 First Gas Flow Path (Gas flow path), 127, 145 confluent part, 128 gas introduction flow path, 131 fuel gas introduction port, 141 gas pipe (gas flow path formation part), Z stacking direction.

Claims (5)

A plurality of stacked fuel cells,
An injector for supplying a fuel gas to the fuel cell,
A fuel gas circulation pump that circulates the fuel gas in order to supply the fuel gas discharged from the fuel cell to the fuel cell again.
A fuel gas supply channel extending in the stacking direction of the fuel cells is formed in the plurality of fuel cells,

The injector injects fuel gas toward the fuel gas supply passage, and the direction of the injection is set along the stacking direction,
A merging portion of the fuel gas circulated by the fuel gas circulation pump and the fuel gas supplied by the injector is provided on the upstream side of the fuel cell and on the downstream side of the injector. battery. An end plate arranged on one side of the stacking direction,
A manifold disposed between the end plate and the fuel cell in the stacking direction,
The manifold has a gas flow path for flowing the fuel gas delivered by the fuel gas circulation pump in a direction different from the stacking direction, and the confluence portion is provided at an end of the gas flow path. 1. The fuel cell according to 1. The fuel cell according to claim 2, wherein the gas flow path of the manifold is formed obliquely so that a side of the merging portion is higher than an opposite side. An end plate arranged on one side of the stacking direction,
With the injector mounted, an injector block attached to the end plate,
Further comprising a gas flow channel forming unit connecting the fuel gas circulation pump and the injector block,
The fuel cell according to claim 1, wherein the merging portion is provided inside the injector block. The fuel cell according to any one of claims 1 to 4, wherein a reduced diameter portion that causes cavitation in the liquid flowing into the confluence portion is provided in a gas introduction flow path from the injector to the confluence portion. ..

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