Multi-cylinder structured supply piping

Abstract

To provide a multi-cylindrical structure supply pipe capable of efficiently supplying hydrogen, electric power, or the like from one of a fuel cell vehicle and a stationary fuel cell system to the other.SOLUTION: According to a standpoint of the disclosure, there is provided a multi-cylindrical structure supply pipe which includes at least three concentric pipes that couple a stationary fuel cell system that is stationary and an in-vehicle fuel cell system mounted on a fuel cell vehicle. The at least three concentric pipes include: a hydrogen supply pipe which allows hydrogen gas to flow therethrough; a liquid circulation pipe which is disposed to surround an outer periphery of the hydrogen supply pipe and through which a liquid flows outside the hydrogen supply pipe; and an electric wire pipe which is disposed to surround an outer periphery of the liquid circulation pipe and provided with one or more electric wires outside the liquid circulation pipe.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a multi-cylindrical structure supply pipe suitable for a power supply system including a fuel cell vehicle and a stationary fuel cell system.

Background Art

[0002] A fuel cell system installed in, for example, a home or a factory, generally also referred to as Enerfarm (registered trademark), is known. In this home fuel cell system, power generation is performed through a stationary fuel cell by hydrogen produced from fuels such as city gas and LP gas and oxygen in the air.

[0003] For such a stationary fuel cell system, for example, a power supply system has been proposed in which a fuel cell vehicle or an electric vehicle is connected to perform power supply during a power outage. For example, Patent Document 1 discloses a configuration in which power is supplied to electrical equipment in a home using the battery of an electric vehicle during a power outage. Further, Patent Document 2 proposes a power supply system that can efficiently supply power to home electrical equipment during a power outage by the cooperation of a vehicle having means for supplying power to the outside of the vehicle and a stationary fuel cell system.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Not limited to the aforementioned patent documents, current technology still fails to meet market needs, and the following challenges remain. Specifically, fuel cell vehicles, which have a power generation mechanism similar to that of stationary fuel cell systems, are highly compatible with power supply systems that include these stationary fuel cell systems. However, conventional technologies, including Patent Document 2, do not specifically clarify the piping structure used to supply hydrogen and electricity from one fuel cell vehicle to the other, and there is considerable room for improvement, at least in this respect.

[0006] This disclosure has been made in view of the above-mentioned problems as an example, and aims to provide a multi-cylinder structured supply piping that can efficiently supply hydrogen, electricity, and other resources from one fuel cell vehicle and the other stationary fuel cell system. [Means for solving the problem]

[0007] To solve the above problems, in view of the present disclosure, a multi-cylindrical structured supply piping is provided which has at least three concentric pipings connecting a stationary fuel cell system and an on-board fuel cell system mounted on a fuel cell vehicle, comprising: a hydrogen supply pipe through which hydrogen gas flows; a liquid flow pipe arranged to surround the outer circumference of the hydrogen supply pipe and through which liquid flows outside the hydrogen supply pipe; and a wire piping arranged to surround the outer circumference of the liquid flow pipe and through which one or more wires are provided outside the liquid flow pipe. [Effects of the Invention]

[0008] According to this disclosure, it is possible to efficiently supply the necessary hydrogen and electricity from one fuel cell vehicle to the other through a single piping structure. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing a power supply system according to an embodiment. [Figure 2]This is a schematic diagram showing the functional blocks of a power supply system according to an embodiment. [Figure 3] This is a schematic diagram showing an example of a heat exchanger installed in a fuel cell vehicle according to the embodiment. [Figure 4] This is a schematic diagram showing the layer structure of a multi-cylindrical supply piping according to an embodiment. [Figure 5] This is a cross-sectional view of a multi-cylinder type supply piping according to an embodiment. [Figure 6] This is a flowchart illustrating the operation method of the power supply system according to the embodiment. [Modes for carrying out the invention]

[0010] Next, preferred embodiments of the present disclosure will be described. In this specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted. Furthermore, configurations other than those detailed below may be implemented while appropriately supplementing known elemental technologies and configurations related to stationary fuel cell systems and fuel cell vehicles, including the aforementioned patent documents.

[0011] <Power supply system 500> Figure 1 schematically shows the power supply system 500 in this embodiment. As can be seen from the figure, the power supply system 500 is composed of a stationary fuel cell system 200 installed in homes, factories, etc., an on-board fuel cell system 300 mounted on a fuel cell vehicle (FCV) and connectable to the stationary fuel cell system 200 via a multi-cylinder structured supply piping 100, and an EV power supply system 400 mounted on an electric vehicle (EV) and connectable to the stationary fuel cell system 200 via a known power line el2.

[0012] <Stationary Fuel Cell System 200> Next, the configuration and function of the stationary fuel cell system 200 will be described with reference to Figures 1 and 2. Figure 2 is a schematic diagram showing the functional block of the power supply system according to the embodiment. As can be seen from these diagrams, the stationary fuel cell system 200 comprises a first control device 210, a first terminal block 220, a power conditioner 230, a stationary fuel cell unit 240A, a fuel gas tank 240B, a hot water storage tank 250, a battery 260, a second terminal block 270, and a hot water supply system 280.

[0013] The stationary fuel cell system 200 includes a household fuel cell cogeneration system also known as EneFarm (registered trademark), and can be installed, for example, in a typical home. The following description will use the stationary fuel cell system 200 as EneFarm (registered trademark) as an example, but the stationary fuel cell system 200 in this embodiment may be installed in other buildings such as factories, in addition to typical homes.

[0014] The first control device 210 has a function to control the operation of a power conditioner 230 and a stationary fuel cell unit 240A, which will be described later. More specifically, the first control device 210 in this embodiment can be a known computer configured to include one or more processors (CPU (Central Processing Unit)) and one or more memories that are communicatively connected to the one or more processors.

[0015] The first terminal block 220 is a connection terminal to which one end of the multi-cylinder structured supply piping 100, described later, is connected. Since hydrogen and circulating water are supplied to the multi-cylinder structured supply piping 100 and insulated wires are also installed, the first terminal block 220 is configured so that these are distributed independently to the necessary locations of the stationary fuel cell system 200. There are no particular restrictions on the specific structure of the first terminal block 220 as long as it performs the functions described above, and for example, connection structures for piping disclosed in Japanese Patent Publication No. 2004-085372, which discloses a double piping structure, or Japanese Patent Publication No. 2003-279435, which discloses a multi-piping structure, may be applied.

[0016] The power conditioner 230 is a known power conditioner having a function of converting, for example, the DC power generated by the stationary fuel cell unit 240A into AC power and supplying it to electrical equipment in the home. Further, the power conditioner 230 in the present embodiment may have a function of converting the DC power supplied from the fuel cell vehicle FCV via the multi-cylindrical structure supply pipe 100 into AC power and supplying it to electrical equipment in the home.

[0017] The stationary fuel cell unit 240A is a known stationary fuel cell unit installed in a home, factory, or the like. Examples of such a stationary fuel cell unit 240A include known fuel cell units applied to the above-mentioned EneFarm (registered trademark). Similarly, for the fuel gas tank 240B, the hot water storage tank 250, the storage battery 260, and the hot water supply equipment 280, known units that can be applied to the above-mentioned EneFarm (registered trademark) can be exemplified respectively.

[0018] The second terminal block 270 is a known terminal block that can be connected to the power line of the above-mentioned electric vehicle EV. Examples of the second terminal block 270 include known terminal blocks applied to, for example, known plug-in hybrid vehicles and electric vehicles. Thereby, for example, the first control device 210 can execute control to supply the necessary power from the electric vehicle EV connected by the power line el2 to the storage battery 260 and the electrical equipment in the home via the second terminal block 270 and the power conditioner 230.

[0019] <In-vehicle fuel cell system 300> Next, the configuration and function of the on-board fuel cell system 300 will be described with reference to Figures 1 to 3. As can be seen from the figures, the on-board fuel cell system 300 in this embodiment is composed of a second control device 310, a fuel cell stack 320, a fuel gas tank 330, an external connection port 340, and a heat exchanger 350. In addition to the on-board fuel cell system 300 described above, the fuel cell vehicle (FCV) in this embodiment may also be composed of known fuel cell vehicle equipment such as an auxiliary battery, a high-voltage battery, and a DC / DC converter.

[0020] The second control device 310 is configured to have, for example, a function for controlling the fuel cell stack 320 described above. More specifically, the second control device 310 in this embodiment is configured as a computer comprising one or more processors (CPU (Central Processing Unit)) and one or more memories communicately connected to the one or more processors. Such a second control device 310 may be configured as one of the known ECUs (Electronic Control Units) mounted on a fuel cell vehicle.

[0021] The fuel cell stack 320 is a known fuel cell unit installed in a fuel cell vehicle (FCV). The fuel gas tank 330 can be exemplified by a known hydrogen tank installed in a fuel cell vehicle (FCV).

[0022] The external connection port 340 is comprised of a fuel filling port 341 and one of the second connection port 342 and the third connection port 343. Of these, the fuel filling port 341 is used to fill the fuel gas tank 330 with high-pressure hydrogen supplied from a known hydrogen station via an on-board pressure reducing valve or the like. filling This is a known filling port for that purpose.

[0023] The second connection port 342 and the third connection port 343 are terminal blocks having a structure similar to the first terminal block 220 described above. Hydrogen and circulating water supplied via the multi-cylindrical supply piping 100 are configured in the first terminal block 220 to be distributed independently to the necessary locations in the fuel cell vehicle (FCV).

[0024] Of these, the second connection port 342 is provided in the fuel cell vehicle (FCV) separately from the fuel filling port 341 described above. The hydrogen supplied from the fuel cell vehicle (FCV) to the stationary fuel cell system 200 may be branched off after the pressure reducing valve of the fuel filling port 341 and connected to the second connection port 342, for example.

[0025] Furthermore, the third connection port 343 may be a known hydrogen outlet, such as those provided in fuel cell vehicles (FCVs). In such cases, hydrogen is released from the fuel gas tank 330 through the hydrogen outlet in emergencies, and hydrogen is supplied to the stationary fuel cell system 200 from the third connection port 343 via the multi-cylinder structured supply piping 100 as needed.

[0026] The heat exchanger 350 has the function of exchanging heat between a liquid (for example, tap water) supplied from the stationary fuel cell system 200 via a multi-cylinder type supply piping 100 and cooling water heated in the fuel cell stack 320. More specifically, as shown in Figure 3, cooling water heated by cooling the fuel cell stack 320 on the fuel cell vehicle (FCV) side flows into the heat exchanger 350 from the first inlet FCVin. On the other hand, the liquid supplied from the stationary fuel cell system 200 flows into the second inlet E of the heat exchanger 350. F It flows in from the inlet.

[0027] In this manner, the cooling water that flows from the first inlet FCVin into the heat exchanger 350 is cooled by heat exchange with the liquid supplied from the stationary fuel cell system 200, and then flows out from the first outlet FCVout of the heat exchanger 350. On the other hand, the liquid supplied from the stationary fuel cell system 200 exchanges heat with the heated cooling water in the heat exchanger 350 and is heated, and then flows out from the second outlet E F out of the heat exchanger 350. Then, the liquid flowing out from the second outlet E F out is refluxed to the stationary fuel cell system 200 (such as the hot water storage tank 250 and the hot water supply facility 280) via the multi-cylindrical structure type supply pipe 100.

[0028] <EV power supply system 400> Next, referring to FIGS. 1 to 2, the configuration and function of the EV power supply system 400 will be described. As understood from the figure, the EV power supply system 400 in the present embodiment includes a third control device 410, a high-capacity battery 420, and a third terminal block 430. Note that the electric vehicle EV in the present embodiment may include known equipment for electric vehicles such as an auxiliary battery and a DC / DC converter in addition to the above-described EV power supply system 400.

[0029] The third control device 410 is configured to have a function of controlling charging and discharging of the high-capacity battery 420 described above, for example. More specifically, the third control device 410 of the present embodiment is configured as a computer including one or more processors (CPUs (Central Processing Units)) and one or more memories communicably connected to the one or more processors. Such a third control device 410 may be configured as one of known ECUs (Electronic Control Units) and CMUs (cell management units) mounted on an electric vehicle.

[0030] The high-capacity battery 420 supplies the power required for driving the electric vehicle EV and the power required for the stationary fuel cell system 200 under the control of the third control device 410 described above. As such a high-capacity battery 420, various known secondary batteries such as lithium-ion secondary batteries can be applied.

[0031] The third terminal block 430 is a known terminal block that can be connected to the power conditioner 230 and battery 260 of the stationary fuel cell system 200 via the power line el2. Examples of the third terminal block 430 include known terminal blocks that are applied to known plug-in hybrid vehicles and electric vehicles.

[0032] As described above, the electric vehicle (EV) in this embodiment is equipped with a high-capacity battery 420, which has a higher capacity than that of a fuel cell vehicle (FCV). Therefore, the third control device 410, in cooperation with the first control device 210 and the second control device 310, can also store the electricity generated by the fuel cell stack 320 of the fuel cell vehicle (FCV) in the high-capacity battery 420 via the stationary fuel cell system 200.

[0033] Furthermore, the third control device 410, in cooperation with the first control device 210 and the second control device 310, is capable of supplying the power required by the fuel cell vehicle (FCV) and the stationary fuel cell system 200 from the high-capacity battery 420. In other words, in the power supply system 500 of this embodiment, by storing power in the high-capacity battery 420 of the electric vehicle (EV), which has the largest storage capacity, it is possible to efficiently and without waste store the power generated by the stationary fuel cell system 200 and the fuel cell vehicle (FCV). This makes it possible to secure and efficiently use valuable power, for example, during disasters or power outages.

[0034] <Multi-layered cylindrical supply piping 100> Next, the multi-cylinder structured supply piping 100 in this embodiment will be described in detail. The multi-cylinder structured supply piping 100 in this embodiment has at least three concentric pipes (with the centers of the openings in each pipe arranged in approximately the same way) that connect a stationary fuel cell system 200 and an on-board fuel cell system 300 mounted on a fuel cell vehicle (FCV).

[0035] More specifically, as shown in Figures 4 and 5, the multi-cylinder structured supply piping 100 of this embodiment has the function of connecting the stationary fuel cell system 200 and the on-board fuel cell system 300 and facilitating the exchange of necessary gases, liquids, etc., and is composed of at least a hydrogen supply pipe 10, a liquid flow pipe 20, and an electrical wiring pipe 30.

[0036] As can be seen from these figures, the hydrogen supply pipe 10 is located on the innermost side of the multi-cylinder structured supply piping 100 and is configured to circulate hydrogen gas. The material of the pipe wall 11 in such a hydrogen supply pipe 10 may be a known hydrogen supply pipe, such as a resin layer with a metal reinforcement layer.

[0037] Furthermore, as shown in Figure 5 and other figures, in the multi-cylinder structured supply piping 100 of this embodiment, a first reinforcing layer 40 made of a first metal material may be further provided between the hydrogen supply pipe 10 and the liquid flow pipe 20. Such a first reinforcing layer 40 may be made of known metal wire material such as copper, aluminum, or general steel. The interposition of this first reinforcing layer 40 between the hydrogen supply pipe 10 and the liquid flow pipe 20 not only further strengthens the pipe wall of the hydrogen supply pipe 10 but also suppresses leakage from the liquid flow pipe 20. Furthermore, if the hydrogen supply pipe 10 itself is equipped with a reinforcing structure such as sufficient pressure resistance (for example, pressure resistance of several MPa), the first reinforcing layer 40 may be omitted in the multi-cylinder type supply pipe 100 as appropriate.

[0038] As shown in Figure 4 and other figures, the liquid flow pipe 20 is arranged to surround the outer circumference of the hydrogen supply pipe 10 and is configured to circulate liquid outside the hydrogen supply pipe 10. As can be seen from Figure 5, it is preferable that the liquid flow pipe 20 in this embodiment includes a first reciprocating circulating water pipe 20A for flow from the stationary fuel cell system 200 to the fuel cell vehicle (FCV) and a second reciprocating circulating water pipe 20B provided concentrically with the first reciprocating circulating water pipe 20A for flow from the fuel cell vehicle (FCV) to the stationary fuel cell system 200. As a result, for example, liquid (tap water, chilled water) supplied from the stationary fuel cell system 200 flows through the first reciprocating circulating water pipe 20A to the heat exchanger 350 of the fuel cell vehicle (FCV), and the heated liquid after heat exchange flows through the second reciprocating circulating water pipe 20B and is returned to the stationary fuel cell system 200.

[0039] Furthermore, as shown in Figure 5 and other figures, in the multi-cylindrical structure type supply piping 100 of this embodiment, a second reinforcing layer 50 made of a second metal material may be further provided between the first reciprocating circulating water pipe 20A and the second reciprocating circulating water pipe 20B. Various known metal materials such as aluminum, stainless steel, or lead can be used as such a second metal material.

[0040] In this embodiment, the second reinforcing layer 50 may have embedded metal wiring to which a predetermined current can be applied under the control of at least one of the first control device 210 and the second control device 310. By embedding such current-applicable metal wiring in the second reinforcing layer 50, a second reinforcing layer 50 with a temperature control function can be constructed. Therefore, for example, the second control device 310 may perform control to apply a predetermined current to the metal wiring in the second reinforcing layer 50 based on the ambient temperature measured by, for example, a temperature sensor (not shown).

[0041] This provides the second reinforcing layer 50 with an antifreeze function for liquid piping in low-temperature environments such as winter, thereby suppressing the freezing of liquid in the liquid flow pipe 20 in low-temperature environments such as winter. Therefore, when the second reinforcing layer 50 has an antifreeze function, it is preferable that the second metal material is different from the first metal material and has a higher electrical resistance than the first metal material.

[0042] Furthermore, in this embodiment, a known heat insulating layer may be interposed on the side of the second reinforcing layer 50 that is in contact with the liquid flow pipe 20 (in this example, the first reciprocating circulating water pipe 20A side) through which the cold water flows. In other words, a heat insulating layer may be interposed between the first reciprocating circulating water pipe 20A and the second reciprocating circulating water pipe 20B. As such a heat insulating layer, a known resin material with heat insulating properties such as polyvinyl chloride or phenolic resin can be applied.

[0043] As shown in Figure 5 and other figures, the electrical conduit 30 is arranged to surround the outer circumference of the liquid flow pipe 20, and one or more electrical wires el1 are provided on the outside of the liquid flow pipe 20. In the illustration, multiple electrical wires el1 are provided in the circumferential direction within the electrical conduit 30, but a single electrical wire el1 may be provided. Furthermore, various known insulating materials, such as epoxy resin or silicone rubber, may be filled between the multiple electrical wires el1 inside the electrical conduit 30.

[0044] In this embodiment, the electric wire el1 in the electrical conduit 30 is configured to electrically connect, for example, a battery (not shown) or fuel cell stack 320 mounted on a fuel cell vehicle (FCV) to a power conditioner 230 or storage battery 260 of a stationary fuel cell system 200. As a result, the first control device 210 and the second control device 310 can, for example, supply power obtained from the fuel cell stack 320 of the fuel cell vehicle (FCV) to the stationary fuel cell system 200 via the electric wire el1 of the electrical conduit 30. Furthermore, the first control device 210 and the second control device 310 may also perform control to supply the necessary power from the battery 260 of the stationary fuel cell system 200 to the fuel cell vehicle (FCV) via the electric wire el1 of the electrical conduit 30.

[0045] <How the power supply system operates> Next, with reference to Figure 6, an example of how to operate the power supply system 500 using the multi-cylindrical structure type supply piping 100 of this embodiment will be described. The operation method described below is performed by at least one of the first control device 210 and the second control device 310 described above. In this case, if one of the first control device 210 or the second control device 310 acts as the main control device and integrates and controls the above operation method, the other control device functions as a sub-control device. In the following example, the case in which the first control device 210 functions as the main control device will be described.

[0046] In other words, a user utilizing the multi-cylinder type supply piping 100 connects the stationary fuel cell system 200 and the fuel cell vehicle (FCV) using the multi-cylinder type supply piping 100. Then, in step 1, it is detected whether or not the multi-cylinder type supply piping 100 is connected to both the stationary fuel cell system 200 and the fuel cell vehicle (FCV).

[0047] If it is determined in step 1 that the multi-cylinder structured supply piping 100 has been connected, then in step 2, it is determined whether hydrogen is needed in the stationary fuel cell unit 240A via the fuel cell vehicle (FCV). At this time, for example, if the hydrogen supply from the fuel gas tank 240B is interrupted during a disaster such as an earthquake, the first control device 210 may determine that hydrogen is needed in the stationary fuel cell unit 240A via the fuel cell vehicle (FCV).

[0048] Then, in step 2, if it is determined that hydrogen is needed in the stationary fuel cell unit 240A via the fuel cell vehicle (FCV), the first control device 210, for example, executes control in the subsequent step 3A to supply hydrogen from the fuel cell vehicle (FCV) to the stationary fuel cell system 200 via the multi-cylinder structured supply piping 100. This makes it possible to operate the stationary fuel cell unit 240A even when hydrogen cannot be supplied to the stationary fuel cell unit 240A from the fuel gas tank 240B for some reason.

[0049] On the other hand, if it is determined in step 2 that hydrogen is not needed in the stationary fuel cell unit 240A via the fuel cell vehicle (FCV), then in the subsequent step 3B, it is determined whether or not power generation is needed in the fuel cell vehicle (FCV). At this time, for example, the first control device 210 may determine that power generation is needed in the fuel cell vehicle (FCV) if, for example, rapid charging is required for the battery 260 or power storage is required for the electric vehicle (EV).

[0050] Then, if it is determined in step 3B that power generation is necessary in the fuel cell vehicle (FCV), the first control device 210, for example, works in cooperation with the second control device 310 to execute control in the subsequent step 4 to operate the fuel cell stack 320 in the fuel cell vehicle (FCV) and generate power. In parallel with this, the first control device 210 executes control to supply the power generated in the fuel cell stack 320 to a desired device (such as a power conditioner 230 or a high-capacity battery 420 for an electric vehicle EV) via the multi-cylinder structured supply piping 100.

[0051] In the subsequent step 5, the first control device 210 controls the supply of liquid (tap water) from the stationary fuel cell system 200 to the heat exchanger 350 of the fuel cell vehicle (FCV) via the multi-cylinder structured supply piping 100. As a result, the liquid (tap water) supplied from the stationary fuel cell system 200 is heated in the heat exchanger 350, becoming hot water, which is then returned to the stationary fuel cell system 200 via the multi-cylinder structured supply piping 100 and stored in a hot water storage tank 250 or the like.

[0052] Then, in step 6, the first control device 210 determines whether the processing in the fuel cell vehicle (FCV) is complete. If it is determined in step 6 that all processing in the fuel cell vehicle (FCV) is complete, the operation method of this embodiment ends. On the other hand, if it is determined in step 6 that all processing in the fuel cell vehicle (FCV) is not yet complete, the process returns to step 2 and each of the above-described processes is executed again.

[0053] Thus, according to the multi-cylinder structured supply piping, power supply system and operating method of this embodiment, it is possible to efficiently supply the necessary hydrogen and electricity from one fuel cell vehicle to the other through a single piping structure.

[0054] The embodiments described above are preferred examples of the present disclosure, and new structures and controls may be realized by combining elements of the embodiments as appropriate, without departing from the spirit of the present disclosure. It is clear to any person with ordinary skill in the art to which the present disclosure belongs that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally be understood to fall within the technical scope of the present disclosure.

[0055] For example, in the embodiment described above, a relatively low-temperature liquid flowed through the first reciprocating circulating water pipe 20A of the multi-cylindrical structure supply piping 100, while the heated liquid after heat exchange flowed through the second reciprocating circulating water pipe 20B. However, the disclosure is not limited to the above embodiment, and a configuration in which a relatively high-temperature liquid flowed through the first reciprocating circulating water pipe 20A and a relatively low-temperature liquid flowed through the second reciprocating circulating water pipe 20B is also possible. [Explanation of Symbols]

[0056] 500 Power Supply Systems 400 EV power system 300 In-vehicle fuel cell systems 200 Stationary Fuel Cell Systems 100 Multi-layered cylindrical supply piping 10 Hydrogen piping 20 Liquid flow pipe 30 Electrical wiring conduit 40. First Reinforcement Layer 50 Second Reinforcement Layer FCV fuel cell vehicle EV (Electric Vehicle)

Claims

1. A multi-cylindrical supply piping structure having at least three concentric circular pipes that connect a stationary fuel cell system and an on-board fuel cell system mounted on a fuel cell vehicle, A hydrogen supply pipe through which hydrogen gas flows, A liquid flow pipe is arranged to surround the outer circumference of the hydrogen supply pipe, and through which liquid flows outside the hydrogen supply pipe, A wire conduit is arranged to surround the outer circumference of the liquid flow pipe, and one or more wires are provided on the outside of the liquid flow pipe. A multi-cylinder type supply piping comprising the above.

2. A first reinforcing layer made of a first metal material is further provided between the hydrogen supply pipe and the liquid flow pipe. The multi-cylinder structured supply piping according to claim 1.

3. The aforementioned liquid flow tube is A first reciprocating circulating water pipe for the flow from the stationary fuel cell system to the fuel cell vehicle, The system includes a second reciprocating circulating water pipe, which is provided concentrically with the first reciprocating circulating water pipe and provides a flow from the fuel cell vehicle toward the stationary fuel cell system, The multi-cylinder structured supply piping according to claim 2.

4. A second reinforcing layer, made of a second metal material, is further provided between the first reciprocating circulating water pipe and the second reciprocating circulating water pipe. The multi-cylinder structured supply piping according to claim 3.

5. The second metal material is a material different from the first metal material and has a higher electrical resistance than the first metal material. The multi-cylinder type supply piping according to claim 4.

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