JP7310771B2 - fuel cell system - Google Patents

Description

The present disclosure relates to fuel cell systems.

Patent Document 1 discloses a fuel cell system in which a fuel cell and a converter are connected via a junction box.

Japanese Patent Application Laid-Open No. 2008-066106

In order to output a large current, it is conceivable to combine two fuel cell stacks to form one fuel cell system. In order to realize such a configuration, the inventors of the present application connect the two junction boxes respectively connected to the two fuel cell stacks to another large-capacity junction box, and connect the large-capacity junction box to the outside. A configuration for supplying power to the load was considered. However, in such a configuration, the number of junction boxes increases, and junction boxes with different capacities are also required, which increases the size of the fuel cell system and increases the manufacturing cost.

The present disclosure can be implemented as the following forms.

(1) According to a first aspect of the present disclosure, a fuel cell system is provided. This fuel cell system includes a first fuel cell unit including a first fuel cell stack, a second fuel cell unit including a second fuel cell stack, and a first internal unit electrically connected to the first fuel cell unit. a first junction box having wiring; and a second junction box having second internal wiring electrically connected to the second fuel cell unit, wherein the first junction box has a first allowable current value. and a second connection port having a second allowable current value larger than the first allowable current value, wherein the first connection port and the second connection port are connected to the first internal wiring The second junction box has a third connection port having the first allowable current value and a fourth connection port having the second allowable current value, and the third connection port and the fourth connection port is electrically connected to the second internal wiring, and the first junction box and the second junction box are electrically connected via the first connection port and the third connection port. the second junction box is electrically connected to an external load through the fourth connection port, and the structure of the first connection port and the structure of the third connection port are the same , and the structure of the second connection port is the same as that of the fourth connection port.
With such a configuration, the first junction box to which the first fuel cell unit is connected and the second junction box to which the second fuel cell unit is connected are connected to each other by the small-capacity connection provided in each junction box. By connecting through the port, a large current can be output to the external load from the large-capacity connection port provided in the second junction box. As a result, since it is not necessary to separately prepare a large-capacity junction box, the manufacturing cost of the fuel cell system can be reduced, and furthermore, an increase in the size of the fuel cell system can be suppressed. Moreover, since the structure of the connection port provided in the first junction box and the structure of the connection port provided in the second junction box are the same, parts can be shared, and the manufacturing cost of the fuel cell system can be effectively reduced. can be reduced significantly.
(2) In the above aspect, the structure of the first connection port may be different from the structure of the second connection port, and the structure of the third connection port may be different from the structure of the fourth connection port. With such a configuration, it is possible to prevent cables from being inserted into connection ports having different allowable current values.
(3) In the above aspect, the second connection port may be sealed. With such a configuration, it is possible to prevent foreign matter from entering the second connection port to which the external load is not connected.
(4) In the above aspect, the second junction box may include a fuse electrically connected to the fourth connection port and the second fuel cell unit. According to such a configuration, it is possible to suppress overcurrent from flowing from the external load to the fuel cell system.

The present disclosure can be realized in various forms other than the above-described form of the fuel cell system, such as a mobile body equipped with a fuel cell system and a stationary power generator equipped with a fuel cell system.

1 is a diagram showing a schematic configuration of a fuel cell system according to a first embodiment; FIG. It is a figure which shows the internal structure of a 1st junction box. It is a figure which shows the internal structure of a 2nd junction box. It is a perspective view of the front side of a junction box. It is a perspective view of the back side of a junction box. It is a front view of a junction box. It is a figure which shows the internal structure of the junction box in 2nd Embodiment. It is a figure which shows the internal structure of the junction box in 3rd Embodiment. It is a figure which shows the internal structure of the junction box in 4th Embodiment. 1 is a diagram showing a schematic configuration of a fuel cell system as a reference example; FIG.

A. First embodiment:
FIG. 1 is a diagram showing a schematic configuration of a fuel cell system 10 according to the first embodiment. The fuel cell system 10 includes a first fuel cell unit 100 , a second fuel cell unit 200 , a first junction box 130 and a second junction box 230 . Fuel cell system 10 is a system that supplies power to external load 300 connected to second junction box 230 . The external load 300 includes, for example, various devices that operate on electric power, such as motors and electrical equipment. The fuel cell system 10 is mounted as a power source on a moving object such as a vehicle, ship, or aircraft, for example. The fuel cell system 10 can also be used as a stationary power generator.

The first fuel cell unit 100 includes a first fuel cell stack 110, a first FCPC 120, a first PCU 140, a first air compressor 150, a first hydrogen pump inverter 160, a first hydrogen pump 170, a first water A pump inverter 180 and a first water pump 190 are provided. "FCPC" is an abbreviation for Fuel Cell Power Unit Controller. "PCU" is an abbreviation for power control unit. First PCU 140 includes a first air compressor inverter 142 and a first DC/DC converter 144 . First air compressor 150, first hydrogen pump 170, and first water pump 190 are devices that assist power generation by first fuel cell stack 110, and are also called fuel cell auxiliary devices.

The second fuel cell unit 200 includes a second fuel cell stack 210, a second FCPC 220, a second PCU 240, a second air compressor 250, a second hydrogen pump inverter 260, a second hydrogen pump 270, a second water A pump inverter 280 and a second water pump 290 are provided. Second PCU 240 includes a second air compressor inverter 242 and a second DC/DC converter 244 . The configuration of the second fuel cell unit 200 is the same as that of the first fuel cell unit 100 . Therefore, the configuration of the first fuel cell unit 100 will be described in detail below, and the description of the second fuel cell unit 200 will be omitted.

The first fuel cell stack 110 is a power generator having a stack structure in which a plurality of fuel cells are stacked. In this embodiment, a solid polymer type cell is used as the fuel cell. The first fuel cell stack 110 is supplied with hydrogen as a fuel gas and air containing oxygen as an oxidizing gas, and the electrochemical reaction of these gases generates power. For example, hydrogen is supplied to the first fuel cell stack 110 from a high pressure hydrogen tank (not shown). Air is supplied from first air compressor 150 driven by first PCU 140 . Electric power generated by the first fuel cell stack 110 is output to the first FCPC 120 . The fuel cell is not limited to solid polymer cells, and various types of cells such as solid oxide cells and phosphoric acid cells can be used.

First FCPC 120 includes a boost converter that boosts the DC power output from first fuel cell stack 110 . The boosted power is output to first junction box 130 through first wiring 101 .

The first junction box 130 outputs the power supplied from the first FCPC 120 to the second junction box 230 through the first cable 13 and to the first PCU 140 through the second wiring 102 . The first junction box 130 and the second junction box 230 are electrical connection boxes that connect, branch, and relay electric wires. First junction box 130 and second junction box 230 have the same structure and configuration. The detailed structure and configuration of first junction box 130 and second junction box 230 will be described later.

First PCU 140 supplies the power supplied from first junction box 130 to first air compressor inverter 142 to convert it into three-phase AC power. The converted three-phase AC power is supplied to first air compressor 150 and used to drive first air compressor 150 . The first air compressor 150 is a device that supplies air as an oxidizing gas to the first fuel cell stack 110 . First PCU 140 also uses first DC/DC converter 144 to step down the power supplied from first junction box 130 .

The power stepped down by first DC/DC converter 144 is supplied to first hydrogen pump inverter 160 and first water pump inverter 180 via first FCPC 120 . First hydrogen pump inverter 160 converts the DC power supplied from first DC/DC converter 144 into three-phase AC power to drive first hydrogen pump 170 . First hydrogen pump 170 is a pump for circulating and supplying hydrogen-containing anode off-gas discharged from first fuel cell stack 110 to first fuel cell stack 110 . First water pump inverter 180 converts the DC power supplied from first DC/DC converter 144 into three-phase AC power to drive first water pump 190 . The first water pump 190 is a pump for circulating cooling water in the cooling pipe that cools the first fuel cell unit 100 . The first hydrogen pump inverter 160 and the first water pump inverter 180 may be provided in the first FCPC 120 . Further, the power stepped down by first DC/DC converter 144 may be directly supplied to first hydrogen pump inverter 160 and first water pump inverter 180 without passing through first FCPC 120 .

Electric power generated by the first fuel cell stack 110 of the first fuel cell unit 100 is supplied to the second junction box 230 through the first cable 13 . Electric power generated by the second fuel cell stack 210 of the second fuel cell unit 200 is also supplied to the second junction box 230 through the third wiring 201 . The second junction box 230 receives power generated by both the first fuel cell stack 110 and the second fuel cell stack 210, and supplies the power to the second fuel cell unit 200 through the fourth wiring 202. While supplying to the second PCU 240 , it outputs to the external load 300 via the second cable 14 . Thus, in this embodiment, the first fuel cell unit 100 and the second fuel cell unit 200 are connected in parallel using the first junction box 130 and the second junction box 230, and both of these units can be supplied to the external load 300.

FIG. 2 is a diagram showing the internal configuration of the first junction box 130. As shown in FIG. The first junction box 130 has a first connection port 131 and a second connection port 132 . The first connection port 131 has a first allowable current value. The second connection port 132 has a second allowable current value greater than the first allowable current value. The allowable current value is a predetermined current value that allows output from the connection port. The first allowable current value is, for example, 150-200A, and the second allowable current value is, for example, 300-400A. The first connection port 131 and the second connection port 132 each have a plus terminal and a minus terminal. A third connection port 231 of the second junction box 230 is electrically connected to the first connection port 131 via the first cable 13 . Nothing is connected to the second connection port 132 .

The first junction box 130 has a first internal wiring 133 composed of a positive wiring PW and a negative wiring MW. The first internal wiring 133 is configured by, for example, a copper busbar. The first connection port 131 and the second connection port 132 are electrically connected to the first internal wiring 133 . The first internal wiring 133 is electrically connected to the first FCPC 120 via the first wiring 101 and electrically connected to the first PCU 140 via the second wiring 102 . With such a configuration, first connection port 131 and second connection port 132 are electrically connected to first fuel cell unit 100 including first FCPC 120 and first PCU 140 via first internal wiring 133 . A first fuse 134 is connected between the first wiring 101 and the second wiring 102 and the first connection port 131 and the second connection port 132 in the positive wiring PW. The first fuse 134 is an element that locally generates heat and melts when a current exceeding the rated current value of the first fuse 134 flows. This first fuse 134 prevents overcurrent from flowing from the first connection port 131 to the first FCPC 120 and the first PCU 140 .

FIG. 3 is a diagram showing the internal configuration of the second junction box 230. As shown in FIG. The second junction box 230 has a third connection port 231 and a fourth connection port 232 . The third connection port 231 and the fourth connection port 232 each have a plus terminal and a minus terminal. The third connection port 231 has the same first allowable current value as the first connection port 131 of the first junction box 130 . The fourth connection port 232 has the same second allowable current value as the second connection port 132 of the first junction box 130 . The first connection port 131 of the first junction box 130 is electrically connected to the third connection port 231 via the first cable 13 . An external load 300 is electrically connected to the fourth connection port 232 via the second cable 14 .

The second junction box 230, like the first junction box 130, has a second internal wiring 233 composed of a positive wiring PW and a negative wiring MW. The second internal wiring 233 is composed of, for example, a copper busbar. The third connection port 231 and the fourth connection port 232 are electrically connected to the second internal wiring 233 . The second internal wiring 233 is electrically connected to the second FCPC 220 via the third wiring 201 and electrically connected to the second PCU 240 via the fourth wiring 202 . With such a configuration, third connection port 231 and fourth connection port 232 are electrically connected to second fuel cell unit 200 including second FCPC 220 and second PCU 240 via second internal wiring 233 . A second fuse 234 is connected between the third wiring 201 and the fourth wiring 202 and the third connection port 231 and the fourth connection port 232 in the positive wiring PW. The second fuse 234 is an element that locally generates heat and melts when a current exceeding the rated current value of the second fuse 234 flows. The second fuse 234 prevents overcurrent from flowing from the third connection port 231 or the fourth connection port 232 to the second FCPC 220 and the second PCU 240 .

As described above with reference to FIGS. 2 and 3, first junction box 130 and second junction box 230 have the same electrical configuration.

4 is a front perspective view of first junction box 130 and second junction box 230. FIG. FIG. 5 is a rear perspective view of first junction box 130 and second junction box 230. FIG. FIG. 6 is a front view of first junction box 130 and second junction box 230. FIG.

As shown in FIGS. 4 and 6, the front side of the first junction box 130 is provided with a first connection port 131 and a second connection port 132 to which the first cable 13 is connected. The first cable 13 is connected to the first connection port 131 via a detachable connector. A third connection port 231 to which the first cable 13 is connected and a fourth connection port 232 to which the second cable 14 is connected are provided on the front side of the second junction box 230 . The first cable 13 is connected to the third connection port 231 via a detachable connector. The second cable 14 is connected to the fourth connection port 232 via a detachable connector.

As shown in FIGS. 4 and 5 , second wiring 102 electrically connected to first internal wiring 133 extends from the upper surface of first junction box 130 . Also, the first wiring 101 electrically connected to the second internal wiring 233 extends from the rear surface of the first junction box 130 . First wiring 101 and second wiring 102 may be connected to first junction box 130 via a detachable connector, or may be directly connected. A fourth wiring 202 electrically connected to the second internal wiring 233 extends from the upper surface of the second junction box 230 . A third wiring 201 electrically connected to the second internal wiring 233 extends from the rear surface of the second junction box 230 . The third wiring 201 and the fourth wiring 202 may be connected to the second junction box 230 via a detachable connector, or may be directly connected.

As described above with reference to FIGS. 4 to 6, first junction box 130 and second junction box 230 have the same external shape.

FIG. 6 shows a first connection port 131 and a second connection port 132 provided in front of the first junction box 130, and a third connection port 231 and a fourth connection port provided in front of the second junction box 230. 232 are shown in their respective placements and schematic shapes. As shown in FIG. 6, the first connection port 131 and the second connection port 132 provided in the first junction box 130 have different structures. Also, the third connection port 231 and the fourth connection port 232 provided in the second junction box 230 have different structures.

In this embodiment, the structure of the first connection port 131 of the first junction box 130 and the structure of the third connection port 231 of the second junction box 230 are the same. In this embodiment, having the same structure means having the same shape and the same dimensions. Specifically, the first connection port 131 and the third connection port 231 have a laterally long elliptical connector shape, and have a structure in which a positive terminal and a negative terminal are horizontally arranged. Also, in this embodiment, the structure of the second connection port 132 of the first junction box 130 and the structure of the fourth connection port 232 of the second junction box 230 are the same. Specifically, the second connection port 132 and the fourth connection port 232 have a rectangular connector shape, and have a structure in which a plus terminal and a minus terminal are arranged vertically. Note that the shape of these connectors is not limited to the shape shown in FIG. 6, and various shapes can be adopted.

In this embodiment, nothing is connected to the second connection port 132 of the first junction box 130 . Therefore, in this embodiment, as shown in FIG. 6 , a metal lid member 138 is attached to the second connection port 132 . The lid member 138 is attached so as to cover the second connection port 132 and seals the second connection port 132 .

According to the fuel cell system 10 of this embodiment described above, the first junction box 130 to which the first fuel cell unit 100 is connected and the second junction box 230 to which the second fuel cell unit 200 is connected are A large current is output to the external load 300 from the large-capacity connection port 232 provided in the second junction box 230 by connecting via the small-capacity connection ports 131 and 231 provided in the respective junction boxes. can. As a result, since it is not necessary to separately prepare a large-capacity junction box, the manufacturing cost of the fuel cell system 10 can be reduced, and further, the increase in size of the fuel cell system 10 can be suppressed. Moreover, since the structure of the connection port provided in the first junction box 130 and the structure of the connection port provided in the second junction box 230 are the same, parts can be shared between these junction boxes. The manufacturing cost of the battery system 10 can be effectively reduced. Moreover, in this embodiment, the first junction box 130 and the second junction box 230 have the same electrical configuration and the same external shape as well as the structure of the connection port. Therefore, since the first junction box 130 and the second junction box 230 can be the same junction box, the manufacturing cost of the fuel cell system 10 can be further reduced.

Further, in the present embodiment, the structure of the first connection port 131 provided in the first junction box 130 is different from the structure of the second connection port 132, and further, the third connection port provided in the second junction box 230 is different. The structure of the connection port 231 and the structure of the fourth connection port 232 are different. Therefore, it is possible to suppress mis-insertion of cables to connection ports having different allowable current values. Specifically, the first cable 13 connected to the first connection port 131 of the first junction box 130 having the first allowable current value has a second allowable current value greater than the first allowable current value. Misinsertion into the second connection port 132 can be suppressed. In addition, the second cable 14 for passing a maximum current of the second allowable current value to the external load 300 is connected to the third junction box 230 of the second junction box 230 having the first allowable current value smaller than the second allowable current value. Misinsertion into the connection port 231 can be suppressed.

Also, in the present embodiment, the second connection port 132 of the first junction box 130 to which no cable is connected is sealed by the lid member 138 . Therefore, it is possible to prevent foreign matter such as water from entering the second connection port 132 and to prevent the foreign matter from being applied with a high voltage.

In addition, in this embodiment, the first junction box 130 is provided with the first fuse 134 , and the second junction box 230 is provided with the second fuse 234 . However, these fuses can be omitted. In this case, the first wiring 101 and the second wiring 102 are directly connected to the first connection port 131 and the second connection port 132 in the positive wiring PW of the first junction box 130 . In addition, the third wiring 201 and the fourth wiring 202 are directly connected to the third connection port 231 and the fourth connection port 232 in the positive wiring PW of the second junction box 230 .

B. Second embodiment:
FIG. 7 is a diagram showing the internal configuration of the first junction box 130b and the second junction box 230b in the second embodiment. Since the internal configuration of the first junction box 130b and the internal configuration of the second junction box 230b are the same, the internal configuration of the second junction box 230b will be described below.

The second junction box 230b has a configuration in which a third fuse 51 is provided in place of the second fuse 234 in the second junction box 230 of the first embodiment. In this embodiment, the third fuse 51 is provided near the fourth connection port 232 . Specifically, the third fuse 51 is provided in the positive wiring PW branching to the fourth connection port 232 among the wirings branching to the third connection port 231 and the fourth connection port 232 in the second internal wiring 233 . It is

As described above, in the second embodiment, the third fuse 51 is connected to the fourth connection port 232 of the second junction box 230b. Flowing into the battery system 10 can be suppressed.

A cable is not connected to the second connection port 132 of the first junction box 130b. Therefore, the third fuse 51 may not be attached to the first junction box 130b.

C. Third embodiment:
FIG. 8 is a diagram showing the internal configuration of the first junction box 130c and the second junction box 230c in the third embodiment. Since the internal configuration of the first junction box 130c and the internal configuration of the second junction box 230c are the same, the internal configuration of the second junction box 230c will be described below.

The second junction box 230c has a configuration in which a fourth fuse 52 is added to the second junction box 230b in the second embodiment. Specifically, the fourth fuse 52 is provided in the positive wiring PW branching to the third connection port 231 among the wirings branching to the third connection port 231 and the fourth connection port 232 in the second internal wiring 233 . It is That is, in the present embodiment, fuses are provided in both of the two wirings branching to the third connection port 231 and the fourth connection port 232 in the second internal wiring 233 . The allowable current value of the third connection port 231 is smaller than the allowable current value of the fourth connection port 232 . Therefore, the rated current value of the fourth fuse 52 is less than or equal to the rated current value of the third fuse 51 .

According to the third embodiment described above, since fuses are provided in both of the two wirings branching into the third connection port 231 and the fourth connection port 232 in the second internal wiring 233, external load Overcurrent can be suppressed from flowing into the fuel cell system 10 through the second junction box 230c, and overcurrent can be suppressed from flowing into the second fuel cell unit 200 from the first fuel cell unit 100. Overcurrent flowing from the unit 200 to the first fuel cell unit 100 can be suppressed.

D. Fourth embodiment:
FIG. 9 is a diagram showing the internal configuration of the first junction box 130d and the second junction box 230d in the fourth embodiment. Since the internal configuration of the first junction box 130d and the internal configuration of the second junction box 230d are the same, the internal configuration of the second junction box 230d will be described below.

The second junction box 230d has a configuration in which a fifth fuse 53 and a sixth fuse 54 are provided instead of the second fuse 234 in the second junction box 230 of the first embodiment. Specifically, the fifth fuse 53 is provided on the plus side wiring PW connecting the third wiring 201 extending from the second FCPC 220 and the second internal wiring 233, and the sixth fuse 54 is provided on the fourth wiring extending from the second PCU 240. 202 and the second internal wiring 233 are provided on the plus side wiring PW. That is, in the second junction box 230d, the wiring before the output from the second FCPC 220 is branched and the wiring after the output is branched to the second PCU 240 are provided with fuses.

According to the fourth embodiment described above, the wiring before the output from the second FCPC 220 is branched and the wiring after the output is branched to the second PCU 240 are each provided with a fuse in the second junction box 230d. Therefore, even if overcurrent flows into second junction box 230 d from external load 300 , the overcurrent can be prevented from flowing into second FCPC 220 and second PCU 240 . Therefore, overcurrent from the external load 300 can be suppressed from flowing into the second fuel cell unit 200 .

Also, in the first junction box 130d, even if an overcurrent from the external load 300 flows into the first junction box 130 through the second junction box 230d and the first cable 13, the overcurrent flows into the first FCPC 120 and the first PCU 140. It can be suppressed that it flows into and. Therefore, overcurrent from the external load can be suppressed from flowing into the first fuel cell unit 100 .

E. Other embodiments:
(E-1) In the above embodiment, the structure of the first connection port 131 of the first junction box 130 is different from the structure of the second connection port 132, and the third connection port 231 of the second junction box 230 is different. and the structure of the fourth connection port 232 are different. On the other hand, the structure of the first connection port 131 of the first junction box 130 and the structure of the second connection port 132 may be the same, and the structure of the third connection port 231 of the second junction box 230 and the structure of the fourth connection may be the same. The structure of the mouth 232 may be the same. Even with such a form, it is possible to reduce the manufacturing cost of the fuel cell system.

(E-2) In the above embodiment, the second connection port 132 of the first junction box 130 is sealed. On the other hand, the second connection port 132 may be open. Also, the second connection port 132 may not be completely sealed, and may be covered with a lid member to the extent that foreign matter does not enter.

(E-3) In the above embodiment, the fuse is provided in the positive wiring PW. On the other hand, a fuse may be provided in the negative wiring MW. Also, fuses may be provided in both the positive wiring PW and the negative wiring MW.

(E-4) In the above embodiment, the first internal wiring 133 provided in the first junction box 130 and the second internal wiring 233 provided in the second junction box 230 may have different allowable current values. . For example, since both the first fuel cell unit 100 and the second fuel cell unit 200 are connected to the second junction box 230, the allowable current value of the second internal wiring 233 is equal to the allowable current value of the first internal wiring 133. can be greater than the value. The allowable current value can be adjusted by changing at least one of the board thickness and board width of the busbars forming the internal wiring. When manufacturing a bus bar by press working, changing the plate width is preferable to changing the plate thickness because it does not require changing the material itself.

(E-5) In the above embodiment, each of the first junction box 130 and the second junction box 230 can be connected to four sets of wires or cables. On the other hand, first junction box 130 and second junction box 230 may be provided with connectors for connecting more wires or cables.

(E-6) In the above embodiment, each of the first fuel cell unit 100 and the second fuel cell unit 200 includes a fuel cell stack, FCPC, PCU, and fuel cell auxiliary equipment. However, the first fuel cell unit 100 and the second fuel cell unit 200 need only include at least a fuel cell stack, and need not include some or all of the FCPC, PCU, and fuel cell auxiliary equipment. Also, the first fuel cell unit 100 and the second fuel cell unit 200 may have a secondary battery or a high-pressure hydrogen tank in addition to the fuel cell stack, FCPC, PCU, and fuel cell auxiliary equipment.

F. Reference example:
FIG. 10 is a diagram showing a schematic configuration of a fuel cell system 10f as a reference example. The fuel cell system 10f has a configuration in which the second fuel cell unit 200 and the second junction box 230 are omitted from the fuel cell system 10 shown in the first embodiment. An external load 300 is connected to the first connection port 131 of the first junction box 130 in the fuel cell system 10f. As shown in this reference example, the first junction box 130 to second junction box 230 have both a first connection port 131 for small-capacity output and a second connection port 132 for large-capacity output. The fuel cell system 10f having one fuel cell unit can be used without being limited to the fuel cell system having two fuel cell units as in each of the above-described embodiments. Although the external load 300 is connected to the first connection port 131 in the reference example shown in FIG. 10 , the external load 300 may be connected to the second connection port 132 .

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10... Fuel cell system 13... 1st cable 14... 2nd cable 51... 3rd fuse 52... 4th fuse 53... 5th fuse 54... 6th fuse 100... 1st fuel cell unit, DESCRIPTION OF SYMBOLS 101... 1st wiring 102... 2nd wiring 110... 1st fuel cell stack 120... 1st FCPC 130... 1st junction box 131... 1st connection port 132... 2nd connection port 133... 1st Internal wiring 134 First fuse 138 Lid member 140 First PCU 142 First air compressor inverter 144 First DC/DC converter 150 First air compressor 160 First hydrogen pump Inverter 170 First hydrogen pump 180 First water pump inverter 190 First water pump 200 Second fuel cell unit 201 Third wiring 202 Fourth wiring 210 Second fuel Battery stack 220 Second FCPC 230 Second junction box 231 Third connection port 232 Fourth connection port 233 Second internal wiring 234 Second fuse 240 Second PCU 242 Second 2 air compressor inverter 244 second DC/DC converter 250 second air compressor 260 second hydrogen pump inverter 270 second hydrogen pump 280 second water pump inverter 290 second Water pump, 300... External load

Claims (4)

A fuel cell system,
a first fuel cell unit including a first fuel cell stack;
a second fuel cell unit including a second fuel cell stack;
a first junction box having first internal wiring electrically connected to the first fuel cell unit;
a second junction box having second internal wiring electrically connected to the second fuel cell unit;
with
The first junction box has a first connection port having a first allowable current value and a second connection port having a second allowable current value greater than the first allowable current value, and the first connection port and the second connection port is electrically connected to the first internal wiring,
The second junction box has a third connection port having the first allowable current value and a fourth connection port having the second allowable current value, the third connection port and the fourth connection port having , electrically connected to the second internal wiring,
The first junction box and the second junction box are electrically connected via the first connection port and the third connection port,
The second junction box is electrically connected to an external load through the fourth connection port,
The structure of the first connection port and the structure of the third connection port are the same,
The structure of the second connection port and the structure of the fourth connection port are the same,
fuel cell system. The fuel cell system according to claim 1,
Unlike the structure of the first connection port and the structure of the second connection port,
The structure of the third connection port is different from the structure of the fourth connection port,
fuel cell system. 3. The fuel cell system according to claim 1 or 2,
A fuel cell system, wherein the second connection port is sealed. The fuel cell system according to any one of claims 1 to 3,
The fuel cell system, wherein the second junction box includes a fuse electrically connected to the fourth connection port and the second fuel cell unit.

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