FUEL CELL SYSTEM FOR A MUSCLE-POWERED VEHICLE

Abstract

The fuel cell system comprises a housing, a fuel cell, and a ventilation fan. The housing includes a front surface configured to face a direction of travel in which the human-powered vehicle travels forward. The housing includes an interior space, a first ventilation opening, and a second ventilation opening. The first ventilation opening and the second ventilation opening communicate with the interior space. The first ventilation opening is at least partially provided in the front surface. The second ventilation opening is at least partially provided in a surface of the housing other than the front surface. The fuel cell is configured to generate power and is at least partially provided in the interior space. The ventilation fan is configured to ventilate at least the housing and the fuel cell to create an airflow from the first ventilation opening to the second ventilation opening.

Description

BACKGROUNDTECHNICAL FIELDThe present invention relates to a fuel cell system for a human-powered vehicle.BACKGROUND INFORMATIONA muscle powered vehicle includes an electrical device configured to drive a power source. The current source has a limited capacitance. Therefore, the power source must be charged. One of the objects of the present disclosure is to reliably supply air to the fuel cell and simultaneously ventilate the case and the fuel cell.SUMMARYAccording to a first aspect of the present invention, a fuel cell system for a muscle-powered vehicle includes a housing, a fuel cell, and a ventilation fan. The housing includes a front surface configured to face a traveling direction in which the muscle-powered vehicle travels forward. The housing includes an interior space, a first vent and a second vent. The first ventilation opening and the second ventilation opening are in communication with the interior space. The first ventilation opening is provided at least partially in the front surface. The second vent is at least partially provided in a surface of the housing other than the front surface. The fuel cell is configured to generate power and is provided at least partially in the internal space. The ventilation fan is configured to ventilate at least the housing and the fuel cell to generate an air flow from the first ventilation opening to the second ventilation opening.In the fuel cell system according to the first aspect, it is possible to reliably introduce outside air into the fuel cell provided in the interior via the first ventilation opening. Moreover, the ventilation fan supplies the air sucked in via the first ventilation opening to the second ventilation opening. Thus, it is possible to reliably supply air to the fuel cell and simultaneously ventilate the housing and the fuel cell.According to a second aspect of the present invention, the fuel cell system according to the first aspect further includes a power storage configured to store power generated by the fuel cell. The electrical storage is removably and removably coupled to the housing.In the fuel cell system according to the second aspect, it is possible to detach the power storage from the case and to reattach it thereto. Thus, it is possible to reliably supply air to the fuel cell while ventilating the casing and the fuel cell and improving the flexibility of use of the fuel cell system.According to a third aspect of the present invention, the fuel cell system according to the second aspect is configured so that the power storage is configured to be electrically connected to a device to supply power to the device, the device being inoperative with respect to the muscle-powered vehicle.In the fuel cell system according to the third aspect, it is possible to use the power storage for a device other than a component of the muscle-powered vehicle.According to a fourth aspect of the present invention, the fuel cell system according to the third aspect is configured so that the power storage is configured to be detachably and re-attachable to the electric device.In the fuel cell system according to the fourth aspect, it is possible to improve maintenance of the power storage, replace the power storage with a new power storage, and / or use the power storage as a portable power storage.According to a fifth aspect of the present invention, the fuel cell system according to the third or fourth aspect further includes at least an electric switch and an indicator.In the fuel cell system according to the fifth aspect, the electric switch allows the fuel cell system to receive user input via the electric switch. The display allows the user to check (information) relating to the fuel cell system.In accordance with a sixth aspect of the present invention, the fuel cell system according to the fifth aspect is configured to electrically connect at least one of the electric switch and the indicator to a substrate.In the fuel cell system according to the sixth aspect, it is possible to electrically connect at least one of the electric switch and the indicator to electronic elements via the substrate.In accordance with a seventh aspect of the present invention, the fuel cell system according to any one of the second to sixth aspects is configured so that the electric power storage is configured to be electrically connected to a bicycle electronic component. The electronic bicycle component includes at least one of a gear changer, a suspension, a height adjustable seat post, a brake device, a lighting device, a display device, and a assist driving device.In the fuel cell system according to the seventh aspect, it is possible to improve usability of the fuel cell system.In accordance with an eighth aspect of the present invention, the fuel cell system according to the seventh aspect is configured so that the power storage device is configured to be detachably connected to an additional electronic bicycle component other than the electronic bicycle component to supply power to the additional electronic bicycle component. The additional electronic bicycle component includes another component of at least one of the gear changer, the suspension, the height adjustable seatpost, the brake device, the lighting device, the display device, and the assist driving device.In the fuel cell system according to the eighth aspect, it is possible to reliably improve usability of the fuel cell system.In accordance with a ninth aspect of the present invention, the fuel cell system according to any one of the second to eighth aspects further includes an electrical connector. The electrical storage device is detachably and remountably connected to the housing via the electrical plug connector.In the fuel cell system according to the ninth aspect, it is possible to remove the electric storage device from the housing via the electrical connector and to reattach it thereto. This can improve flexibility in use of the fuel cell system.In accordance with a tenth aspect of the present invention, the fuel cell system according to any one of the first to ninth aspects is configured so that the case includes a back surface and a side surface. The back surface is provided at a back side of the front surface. The second ventilation hole is provided at least partially on at least one of the back surface and the side surface.In the fuel cell system according to the tenth aspect, the arrangement of the second ventilation hole enables efficient gas discharge via the second ventilation hole compared to a case where the second ventilation hole is provided in the front surface.In accordance with an eleventh aspect of the present invention, the fuel cell system according to the tenth aspect is configured so that the fuel cell includes at least two cells arranged in a first direction. The back surface is spaced from the front surface in a second direction intersecting the first direction.In the fuel cell system according to the eleventh aspect, the arrangement of the front surface and the rear surface causes the air to flow in the second direction. This makes it possible to efficiently contact air with the at least two cells of the fuel cell.In accordance with a twelfth aspect of the present invention, the fuel cell system according to the eleventh aspect is configured so that the first ventilation hole is spaced apart from the fuel cell in the second direction.In the fuel cell system according to the twelfth aspect, it is possible to more efficiently contact the air with the at least two cells of the fuel cell.In accordance with a thirteenth aspect of the present invention, the fuel cell system according to the eleventh or twelfth aspect is configured to define the second direction along the traveling direction.In the fuel cell system according to the thirteenth aspect, it is possible to introduce outside air into the fuel cell more efficiently while the muscle-powered vehicle is traveling in the traveling direction.In accordance with a fourteenth aspect of the present invention, the fuel cell system according to any one of the first to thirteenth aspects is configured so that the first ventilation hole includes at least one first ventilation hole provided in the front surface.In the fuel cell system according to the fourteenth aspect, it is possible to introduce outside air into the fuel cell more efficiently via the at least one first ventilation hole of the first ventilation opening.In accordance with a fifteenth aspect of the present invention, the fuel cell system according to any one of the first to fourteenth aspects further includes a first filter attached to the housing to cover the first ventilation hole.In the fuel cell system according to the fifteenth aspect, it is possible to clean the outside air when flowing through the first filter and / or restrict the intrusion of foreign matter into the case via the first ventilation hole.In accordance with a sixteenth aspect of the present invention, the fuel cell system according to the fifteenth aspect is configured so that the first filter is air-permeable.In the fuel cell system according to the sixteenth aspect, it is possible to clean the outside air when passing through the first filter.In accordance with a seventeenth aspect of the present invention, the fuel cell system according to the fifteenth or sixteenth aspect is configured so that the first filter has a water repellent property.In the fuel cell system according to the seventeenth aspect, it is possible to restrain water from entering the case via the first ventilation hole.In accordance with an eighteenth aspect of the present invention, the fuel cell system according to any one of the first to seventeenth aspects further includes a second filter attached to the housing to cover the second ventilation hole.In the fuel cell system according to the eighteenth aspect, it is possible to restrain entry of foreign matter into the housing via the second ventilation hole.In accordance with a nineteenth aspect of the present invention, the fuel cell system according to the eighteenth aspect is configured so that the second filter is air-permeable.In the fuel cell system according to the nineteenth aspect, it is possible to discharge gas from the housing via the second filter and at the same time restrict foreign matters from entering the housing via the second ventilation opening.In accordance with a twentieth aspect of the present invention, the fuel cell system according to the eighteenth or nineteenth aspect is configured so that the second filter has a water repellent property.In the fuel cell system according to the twentieth aspect, it is possible to restrain water from entering the housing via the second ventilation hole.In accordance with a twenty-first aspect of the present invention, the fuel cell system according to any one of the first to twentieth aspects is configured so that the fuel cell includes at least two cells arranged in a first direction. The ventilation fan is provided at least partially between the first ventilation hole and the second ventilation hole in a second direction intersecting the first direction.In the fuel cell system according to the twenty-first aspect, the arrangement of the ventilation fan enables efficient gas supply from the first ventilation opening to the second ventilation opening.In accordance with a twenty-second aspect of the present invention, the fuel cell system according to any one of the first to twenty-first aspects is configured so that the ventilation fan is provided at least partially in the internal space.In the fuel cell system according to the twenty-second aspect, it is possible to flow air through the internal space.In accordance with a twenty-third aspect of the present invention, the fuel cell system according to any one of the first to twenty-second aspects is configured so that the fuel cell includes at least two cells arranged in a first direction. The ventilation fan is arranged to avoid overlapping with the fuel cell when viewed in a third direction intersecting the first direction.In the fuel cell system according to the twenty-third aspect, it is possible to efficiently arrange the fuel cell and the ventilation fan.In accordance with a twenty-fourth aspect of the present invention, the fuel cell system according to any one of the first to twenty-third aspects is configured to provide the ventilation fan at least partially above the fuel cell in a mounting state in which the housing is mounted on a vehicle body of the muscle-powered vehicle.In the fuel cell system according to the twenty-fourth aspect, it is possible to efficiently arrange the fuel cell and the ventilation fan.In accordance with a twenty-fifth aspect of the present invention, the fuel cell system according to any one of the first to twenty-fourth aspects is configured so that the fuel cell includes at least two cells arranged in a first direction. The ventilation fan is arranged to at least partially overlap with the electricity storage when viewed in a fourth direction intersecting the first direction.In the fuel cell system according to the twenty-fifth aspect, it is possible to efficiently arrange the power storage and the ventilation fan.In accordance with a twenty-sixth aspect of the present invention, the fuel cell system according to any one of the first to twenty-fifth aspects is configured to provide the power storage at least partially in the internal space.In the fuel cell system according to the twenty-sixth aspect, it is possible to protect the power storage.In accordance with a twenty-seventh aspect of the present invention, the fuel cell system according to the first to twenty-sixth aspects is configured so that the housing includes a first housing and a second housing attached to the first housing. The interior space includes a first interior space and a second interior space. The first housing defines the first interior space. The first housing and the second housing define the second interior space. The fuel cell is provided at least partially in the first internal space. The power storage is provided at least partially in the second interior space.In the fuel cell system according to the twenty-seventh aspect, it is possible to use the first internal space and the second internal space as locations where the fuel cell and the power storage are provided, respectively.In accordance with a twenty-eighth aspect of the present invention, the fuel cell system according to the twenty-seventh aspect is configured so that the second internal space is not in communication with the first internal space. The ventilation fan is provided at least partially in the first interior space.In the fuel cell system according to the twenty-eighth aspect, it is possible to reliably flow air in the first internal space in which the fuel cell is provided using the ventilation fan.In accordance with a twenty-ninth aspect of the present invention, the fuel cell system according to any one of the first to twenty-eighth aspects is configured so that the fuel cell is configured to be at least partially provided in a vehicle body of the muscle-powered vehicle.In the fuel cell system according to the twenty-ninth aspect, it is possible to use an interior space of the vehicle body as a location where the fuel cell is provided. Thus, it is possible to save the size of the muscle-powered vehicle while the fuel cell system is equipped with the muscle-powered vehicle.BRIEF DESCRIPTION OF THE DRAWINGSA more complete understanding of the invention and many attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings. FIG. 1 is a side view of a muscle-powered vehicle including a fuel cell system according to one of the embodiments. FIG. 2 is a schematic block diagram of the muscle-powered vehicle shown in FIG. 1. FIG. 3 is a side view of the fuel cell system illustrated in FIG. 1. FIG. 4 is a perspective view of a fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 5 is another perspective view of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 6 is an exploded perspective view of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 7 is a cross-sectional view of the fuel cell unit of the fuel cell system taken along line VII-VII of FIG. 23. FIG. 8 is a perspective view of a power storage of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 9 is an exploded side view of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 10 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along the line X-X of FIG. 23. FIG. 11 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along line XI-XI of FIG. 23. FIGS. 12 to 14 are perspective views of a second case of the fuel cell unit illustrated in FIG. 6. FIG. 15 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along line XV-XV of FIG. 23. FIG. 16 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along line XVI-XVI of FIG. 15. FIG. 17 is a perspective view of the fuel cell unit of the fuel cell system illustrated in FIG. 1, with a case omitted. FIG. 18 is another perspective view of the fuel cell unit of the fuel cell system illustrated in FIG. 1, with a case omitted. FIG. 19 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along the line IXX-IXX of FIG. 17. FIG. 20 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along the line XX-XX of FIG. 7. FIG. 21 is an exploded perspective view of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 22 is a partial cross-sectional view of the fuel cell unit of the fuel cell system taken along the line XXII-XXII of FIG. 23. FIG. 23 is a front view of the fuel cell unit of the fuel cell system illustrated in FIG. 1. FIG. 24 is a schematic block diagram of the muscle-powered vehicle shown in FIG. 1. FIG. 25 shows an arrangement of parts in a fuel cell unit of a fuel cell system according to a first modification. FIG. 26 shows an arrangement of parts in a fuel cell unit of a fuel cell system according to a second modification. FIG. 27 shows an arrangement of parts in a fuel cell unit of a fuel cell system according to a third modification. FIG. 28 shows an arrangement of a fuel cell unit of a fuel cell system according to a fourth modification. FIG. 29 shows a configuration of a fuel cell unit of a fuel cell system according to a fifth modification. FIG. 30 shows a shock absorbing member of a fuel cell unit of a fuel cell system according to a sixth modification.DESCRIPTION OF THE EMBODIMENTSThe embodiments will now be described with reference to the accompanying drawings, in which like reference numerals designate corresponding or identical elements throughout the several drawings.As seen in FIG. 1, a muscle-powered vehicle 2 includes a fuel cell system 10, a crank 3, a sprocket 4, a chain 5, a sprocket assembly 6, a wheel 7A, a wheel 7B, and a vehicle body 8. The crank 3 is rotatably coupled to the vehicle body 8. The crank 3 is rotatable relative to the vehicle body 8 during pedaling. The sprocket 4 is coupled to the crank 3. The sprocket assembly 6 is rotatably coupled to the vehicle body 8. The chain 5 is engaged with the sprocket 4 and the sprocket assembly 6. The sprocket assembly 6 is coupled to the wheel 7A to transmit a pedal force from the crank 3 to the wheel 7A via the sprocket 4 and the chain 5. The sprocket 4 may include at least two sprockets, if necessary or desired.As seen in FIG. 1, the muscle-powered vehicle 2 includes a gear changer RD, a suspension FS, a suspension RS, a height-adjustable seatpost AS, a brake device FB, a brake device RB, a lighting device LD, a display device DD, and an assist driving device AD. The gear changer RD, the suspension FS, the suspension RS, the height adjustable seatpost AS, the brake device FB, the brake device RB, the lighting device LD, the display device DD, and the assist driving device AD are each configured to be mounted on the vehicle body 8 of the muscle-powered vehicle 2.The gear changer RD is configured to change the gear ratio of the muscle-powered vehicle 2. The gear ratio is a ratio between the rotational speed of the sprocket assembly 6 and the rotational speed of the sprocket 4. In the present embodiment, the gear changer RD includes a rear derailleur. However, the gear changer RD may include another type of gear changer as needed or desired. Examples of other types of gear changers include a derailleur and an internally toothed hub.The suspension FS is configured to absorb shocks or vibrations generated when driving on rough terrain. The suspension FS is installed in the front fork 8A. The suspension FS is configured to absorb shocks or vibrations transmitted from the wheel 7A.The suspension RS includes a suspension. The suspension RS is configured to absorb shocks or vibrations generated when driving in rough terrain. The suspension RS is configured to absorb shocks or vibrations transmitted from the wheel 7B.The brake device FB is configured to apply a braking force to the muscle-powered vehicle 2. The brake device FB is configured to apply a braking force to the wheel 7A.The brake device RB is configured to apply a braking force to the muscle-powered vehicle 2. The brake device RB is configured to apply a braking force to the wheel 7B.The height adjustable seatpost AS is configured to change the height of the seat 8S relative to the frame 8F. The height adjustable seat post AS has an adjustable state and a locked state. The height adjustable seat post AS allows the user to change the height of the seat 8S in the adjustable state. The height adjustable seat post AS is locked to maintain the height of the seat 8S in the locked state. The height adjustable seatpost AS is configured to change the state of the height adjustable seatpost AS between the adjustable state and the locked state.The lighting device LD is configured to emit light. The lighting device LD includes a light emitting diode (LED).The display device DD includes at least one of a smartphone and a bicycle computer. The display device DD is configured to display (one) information(s) related to the muscle-powered vehicle 2. However, the display device DD may include structures other than the smartphone and the bicycle computer, as needed or desired.The assist driving device AD is configured to assist driving of the muscle-powered vehicle 2. The assist driving device AD is configured to change an assist ratio depending on the force applied to the muscle-powered vehicle 2.The muscle powered vehicle 2 may include, as needed or as desired, an electric device other than the gear changer RD, the suspension FS, the suspension RS, the height adjustable seatpost AS, the brake device FB, the brake device RB, the lighting device LD, the display device DD, and the assist driving device AD. At least one of the gear changer RD, the suspension FS, the suspension RS, the height adjustable seatpost AS, the brake device FB, the brake device RB, the lighting device LD, the display device DD, and the assist driving device AD may be omitted from the muscle-powered vehicle 2 as needed or desired.In the present application, the term "human-powered vehicle" includes a vehicle that travels with a driving force including at least the human force of a user (i.e., a driver) who is driving the vehicle. The muscle-powered vehicle includes various types of bicycles such as mountain bikes, racing bikes, city bikes, cargo bikes, hand bikes and recumbent bikes. In addition, the muscle-powered vehicle also includes an electric bicycle (e-bike). The electric bicycle is an electrically assisted bicycle that assists propulsion of a vehicle with an electric motor. However, the total number of wheels of the muscle-powered vehicle is not limited to two. The muscle-powered vehicle may also be, for example, a vehicle having one wheel or three or more wheels. Specifically, the muscle-powered vehicle does not include a vehicle that uses only a drive source (e.g., an engine, an electric motor) as a drive force. Generally, a light road vehicle, i.e., a vehicle that does not require a driver's license for public road traffic, is considered to be a muscle-powered vehicle.In the present application, the following directional terms "front", "rear", "forward", "rearward", "left", "right", "transverse", "upward", and "downward", as well as any other similar directional terms, refer to the directions determined based on the user who is in the standard position of the user in the muscle-powered vehicle 10 with respect to a steering rod or steering. Examples of the standard position of the user include a saddle and a seat. Accordingly, these terms, which are used to describe the fuel cell system 10 or other devices, are to be interpreted with respect to the muscle-powered vehicle 2 equipped with the fuel cell system 10 or other devices, which is used in an upright travel position on a horizontal surface.As seen in FIG. 2, the muscle-powered vehicle 2 includes an operating device ST. The operating device ST is configured to receive a user input. The operating device ST is configured to be mounted on the vehicle body 8 (see, e.g., FIG. 1 ) of the muscle-powered vehicle 2. The operation device ST is configured to operate an electric device ED based on the user operation input. The electric device ED includes a bicycle electronic component ED 1, an additional bicycle electronic component ED 2, and a device ED 3. The actuation device ST is configured to transmit at least one signal CS. The actuation device ST is configured to transmit the at least one signal CS wirelessly or via an electrical cable. The electrical device ED may be configured to operate based on the at least one signal CS. At least one of the bicycle electronic component ED 1, the bicycle additional electronic component ED 2, and the device ED 3 may be configured to operate based on the at least one signal CS.The bicycle electronic component ED 1 includes at least one of the gear changer RD, the suspension FS and / or RS, the height adjustable seatpost AS, the brake device FB and / or RB, the lighting device LD, the display device DD, and the assist driving device AD. The additional bicycle electronic component ED 2 includes another one of at least one of the gear changer RD, the suspension FS and / or RS, the height adjustable seatpost AS, the brake device FB and / or RB, the lighting device LD, the display device DD, and the assist driving device AD.In the present embodiment, the bicycle electronic component ED 1 includes the gear changer RD, the suspension FS and / or RS, the height adjustable seatpost AS, the brake device FB and / or RB, the lighting device LD, and the display device DD. The additional bicycle electronic component ED 2 includes the assist driving device AD. However, the bicycle electronic component ED 1 is not limited to the illustrated embodiment. The additional bicycle electronic component ED 2 is not limited to the illustrated embodiment.The device ED 3 includes a device other than the bicycle electronic component ED 1 and the bicycle additional electronic component ED 2. Examples of the device ED 3 include a personal computer, a video game device, and a vehicle other than the muscle-powered vehicle 2. examples of a vehicle other than the muscle-powered vehicle 2 include an electric car and a hybrid car. Thus, the device ED 3 may be inoperative with respect to the muscle-powered vehicle 2. The device ED 3 may be inoperative or inoperative with respect to the muscle-powered vehicle 2.As seen in FIG. 2, the fuel cell system 10 is configured to convert the chemical energy of a fuel and an oxidizing agent into current. For example, the fuel cell system 10 is configured to convert the chemical energy of the fuel and the oxidant into current through a pair of redox reactions. Examples of the fuel include hydrogen. Examples of the oxidizing agent include oxygen contained in the air.The fuel cell system 10 is configured to supply power to the electric device ED. The fuel cell system 10 is configured to supply power to at least one of the bicycle electronic component ED 1, the bicycle additional electronic component ED 2, and the device ED 3. The fuel cell system 10 is configured to be electrically connected to the electric device ED. The fuel cell system 10 is configured to be electrically connected to at least one of the bicycle electronic component ED 1, the bicycle additional electronic component ED 2, and the device ED 3.As seen in FIG. 2, the fuel cell system 10 includes a fuel cell unit 11. the fuel cell unit 11 is configured to convert the chemical energy of the fuel and the oxidizing agent into electricity. The fuel cell unit 11 is configured to supply power to the electric device ED. The fuel cell unit 11 includes a fuel cell 12. The fuel cell 12 is configured to convert the chemical energy of the fuel and oxidant into current. For example, the fuel cell 12 is configured to convert the chemical energy of the fuel and the oxidant into current through the pair of redox reactions.The fuel cell unit 11 includes a power storage 14, namely, the fuel cell system 10 of the muscle-powered vehicle 2 includes a power storage 14, and the power storage 14 is configured to store the power generated by the fuel cell 12. The energy store 14 is configured for charging with the energy generated by the fuel cell 12. The energy store 14 is configured for electrical connection to the fuel cell 12.The power storage 14 is configured to supply the power to the electric device ED. The power storage 14 is configured to supply power to the bicycle electronic component ED 1. The power storage 14 is configured to supply power to the additional electronic bicycle component ED 2. The power storage 14 is configured to supply the power to the device ED 3.The power storage 14 is configured to be electrically connected to the electrical device ED. The electric storage 14 is configured to be electrically connected to the bicycle electronic component ED 1. The electric storage 14 is configured to be electrically connected to the additional electronic bicycle component ED 2. The power storage 14 is configured to be electrically connected to the electrical device ED 3.The power storage 14 is configured to be electrically connected to the electric device ED for supplying power to the electric device ED. The electric storage 14 is configured to be electrically connected to the bicycle electronic component ED 1 for supplying electric power to the bicycle electronic component ED 1. The power storage 14 is configured to be electrically connected to the additional bicycle electronic component ED 2 for supplying power to the additional bicycle electronic component ED 2. The power storage 14 is configured to be electrically connected to the electric device ED for supplying power to the electric device ED other than the bicycle electronic component ED 1. The power storage 14 is configured to be electrically connected to the electric device ED for supplying power to the electric device ED other than the additional bicycle electronic component ED 2. Namely, the power storage 14 is configured to be electrically connected to the device ED 3 for supplying power to the device ED 3.The power storage 14 includes, for example, a rechargeable battery 18. the rechargeable battery 18 is configured to be charged with the power generated by the fuel cell 12. The rechargeable battery 18 is configured to supply power to the bicycle electronic component ED 1. The rechargeable battery 18 is configured to supply power to the additional bicycle electronic component ED 2. Examples of the rechargeable battery 18 include a lithium ion battery, a lead battery, a nickel cadmium battery, and a nickel hydrogen battery.The fuel cell unit 11 includes an electrical connector terminal CN. Namely, the fuel cell system 10 includes the connector electrical terminal CN. An electric wire ED 11, ED 21, or ED 31 is detachably and remountably connected to the connector terminal CN. The bicycle electronic component ED 1 is detachably and remountably connected to the connector terminal CN via the electric cable ED 11. The additional bicycle electronic component ED 2 is detachably and remountably connected to the connector terminal CN via the additional electric cable ED 21. The device ED 3 is detachably and remountably connected to the connector terminal CN via the electric cable ED 31. The fuel cell system 10 may include another connector besides the connector electrical terminal CN.As seen in FIG. 2, the fuel cell unit 11 includes a fuel tank 20. The fuel tank 20 is connected to the fuel cell 12 to supply fuel to the fuel cell 12. The fuel tank 20 is connected to the fuel cell unit 11 via a pipe 22. The fuel tank 20 is connected to the fuel cell 12 via the pipe 22. The fuel tank 20 is configured to store hydrogen, for example.As seen in FIG. 3, the fuel tank 20 is configured to be mounted on the vehicle body 8 of the muscle-powered vehicle 2. The fuel cell system 10 includes a tank holder 24. the tank holder 24 is configured to couple the fuel tank 20 to the vehicle body 8. The tank holder 24 is configured to hold the fuel tank 20 detachably and remountably.The fuel tank 20 includes a tank body 20A, a valve 20B, and a connector 20C. The tank body 20A is configured to store the fuel. The tank body 20A includes a storage space in which the fuel is to be stored. The connector 20C includes an outlet hole. The tank body 20A includes a passage that connects the storage space and the discharge hole. The valve 20B is coupled to the tank body 20A to open or close the passage.The fuel cell system 10 is provided at least partially in the vehicle body 8 of the muscle-powered vehicle 2. In the present embodiment, the fuel cell system 10 is partially provided in the vehicle body 8. The pipe 22 is partially provided in the vehicle body 8. The connector 20C is partially provided in the vehicle body 8. However, the fuel cell system 10 may be provided entirely in the vehicle body 8 as needed or desired. The pipe 22 may be provided entirely within the vehicle body 8 or at least partially outside the vehicle body 8, as needed or desired. The connector 20C may be provided entirely within the vehicle body 8 or at least partially outside the vehicle body 8, as needed or desired.As seen in FIG. 3, the fuel cell unit 11 includes a housing 30. the fuel cell system 10 of the muscle-powered vehicle 2 includes the housing 30. the housing 30 is mountable to the vehicle body 8 of the muscle-powered vehicle 2. In the present embodiment, the fuel tank 20 is provided outside the housing 30. However, the fuel tank 20 may be provided at least partially within the housing 30, as needed or desired. The housing 30 may be configured to be mounted on a part of the muscle-powered vehicle 2 other than the vehicle body 8, as needed or as desired.The fuel cell system 10 further includes a mounting portion 32. the mounting portion 32 is configured to couple the fuel cell unit 11 to the vehicle body 8 of the muscle-powered vehicle 2. The mounting portion 32 is configured to couple the housing 30 to the vehicle body 8 of the muscle-powered vehicle 2.The housing 30 includes a first outer surface 34 and a second outer surface 36. The mounting portion 32 is provided on the second outer surface 36. The second outer surface 36 is at least partially provided between the mounting portion 32 and the power storage 14. In the present embodiment, the second outer surface 36 is partially provided between the mounting portion 32 and the power storage 14. The position of the mounting portion 32 is not limited to the illustrated embodiment.The first outer surface 34 may also be referred to as a front surface 34. The second outer surface 36 may also be referred to as a back surface 36. Namely, the housing 30 includes the front surface 34. the housing 30 includes the rear surface 36.The front surface 34 is configured to face a traveling direction D 5 in which the muscle-powered vehicle 2 travels forward. The back surface 36 is provided at the back of the front surface 34. The front surface 34 is configured to face the traveling direction D 5 in a state where the fuel cell system 10 is mounted on the vehicle body 8. The front surface 34 is non-parallel and non-perpendicular to the travel direction D 5. The back surface 36 is non-parallel and non-perpendicular to the traveling direction D 5. The front surface 34 is inclined relative to the traveling direction D 5. The rear surface 36 is inclined relative to the traveling direction D 5.As seen in FIG. 3, in the present embodiment, the fuel tank 20 is configured to be provided at least partially in front of the fuel cell unit 11 in the traveling direction D 5. The fuel tank 20 is configured to be provided at least partially in front of at least one of the housing 30, the fuel cell 12, and the electric storage 14 in the traveling direction D 5. The fuel tank 20 is configured to be provided completely in front of the fuel cell unit 11 in the traveling direction D 5. The fuel tank 20 is configured to be provided entirely in front of the housing 30, the fuel cell 12, and the electric power storage 14 in the traveling direction D 5. However, the fuel tank 20 may be configured to be partially provided in front of the fuel cell unit 11 in the traveling direction D 5 as needed or desired. The fuel tank 20 may be configured to be partially provided in front of the housing 30 in the traveling direction D 5 as needed or desired. The fuel tank 20 may be configured to be partially provided in front of the fuel cell 12 in the traveling direction D 5 as needed or desired. The fuel tank 20 may be configured to be partially provided in front of the electric storage 14 in the traveling direction D 5 as needed or desired. Each of the housing 30, the fuel cell 12, and the electric storage 14 may be configured to be provided at least partially in front of the fuel tank 20 in the traveling direction D 5 as needed or desired.In the present embodiment, each of the housing 30 and the fuel tank 20 is configured to be mounted on the frame 8F of the vehicle body 8. The housing 30 is configured to be mounted to a seat tube 8F 1 of the frame 8F. The fuel tank 20 is configured to be mounted to a down tube 8F 2 of the frame 8F. However, the housing 30 may be configured to be mounted to a portion of the frame 8F other than the seat tube 8F 1, as needed or desired. The fuel tank 20 may be configured to be mounted to a portion of the frame 8F other than the down pipe 8F 2 as needed or desired. Each of the housing 30 and the fuel tank 20 may be configured to be mounted to a portion of the vehicle body 8 other than the frame 8F, as needed or as desired.As seen in FIG. 3, the housing 30 includes a first end 30A and a second end 30B. The housing 30 extends between the first end 30A and the second end 30B. The first end 30A is disposed closer to the power storage 14 than the second end 30B. The first end 30A is provided above the second end 30B in a mounting state in which the housing 30 is mounted on the vehicle body 8 of the muscle-powered vehicle 2. The electrical storage 14 is provided at least partially above the second end 30B of the housing 30 in the assembled state. In the present embodiment, the power storage 14 is provided entirely above the second end 30B of the housing 30 in the assembled state. However, the power storage 14 may be provided partially above the second end 30B of the housing 30 as needed or desired in the assembled state.As seen in FIGS. 4 and 5, the housing 30 includes a side surface 37. the housing 30 includes a side surface 38. the side surface 37 is provided on a back side of the side surface 38. The side surface 37 is configured to face a lateral direction D 6 in the state where the fuel cell system 10 is mounted on the vehicle body 8. The side surface 38 is configured to face the lateral direction D 6 in the state where the fuel cell system 10 is mounted on the vehicle body 8.As seen in FIG. 3, the lateral direction D 6 intersects the traveling direction D 5. The transverse direction D 6 is perpendicular to the direction of travel D 5. However, the transverse direction D 6 may also not run perpendicular to the direction of travel D 5 if necessary or if desired.As seen in FIG. 6, the housing 30 includes a first housing 40 and a second housing 42. the second housing 42 is attached to the first housing 40. The second housing 42 is detachably and remountably attached to the first housing 40. The second housing 42 is fixed to the first housing 40 by fastening members 43 such as bolts. The second housing 42 is fixed to the first housing 40 to cover the power storage 14.As seen in FIG. 3, the first housing 40 and the second housing 42 define the first outer surface 34. the first housing 40 and the second housing 42 define the second outer surface 36. The mounting portion 32 is configured to couple the first housing 40 to the vehicle body 8.The mounting portion 32 includes a first mounting portion 44 and a second mounting portion 46. the first mounting portion 44 is configured to couple the first housing 40 and the vehicle body 8. The second mounting portion 46 is configured to couple the first housing 40 to the vehicle body 8. The second mounting portion 46 is spaced apart from the first mounting portion 44. However, the structure of the mounting portion 32 is not limited to the illustrated embodiment.As seen in FIG. 7, the housing 30 includes an interior space 50. the fuel cell 12 is at least partially provided in the interior space 50. The energy store 14 is provided at least partially in the interior 50.In the present embodiment, the fuel cell 12 is provided entirely in the internal space 50. The power storage 14 is provided entirely in the internal space 50. However, the fuel cell 12 may be partially provided in the internal space 50 as needed or desired. The power storage 14 may be partially provided in the internal space 50 as needed or desired.The interior space 50 includes a first interior space 52 and a second interior space 54. the first housing 40 defines the first interior space 52. the first housing 40 and the second housing 42 define the second interior space 54. the fuel cell 12 is at least partially provided in the first interior space 52. The electrical energy storage 14 is provided at least partially in the second interior 54.In the present embodiment, the fuel cell 12 is provided entirely in the first internal space 52. The electrical storage 14 is provided completely in the second interior 54. However, the fuel cell 12 may be partially provided in the first internal space 52 as needed or desired. The power storage 14 may be partially provided in the second internal space 54 as needed or desired.As seen in FIG. 6, the power storage 14 is detachably and remountably coupled to the housing 30. The power storage 14 is detachably and remountably coupled to the first housing 40.The fuel cell system 10 further includes a first electrical connector 56. the first electrical connector 56 may also be referred to as an electrical connector 56. Thus, the fuel cell system 10 further includes the electrical connector 56.The first electrical connector 56 is provided on the housing 30. The first electrical connector 56 is coupled to the housing 30. The first electrical connector 56 is coupled to the first housing 40. For example, the first electrical connector 56 is secured to the housing 30. The first electrical connector 56 is fixed to the first housing 40.The electrical storage 14 is detachably and remountably connected to the housing 30 via the first electrical plug connector 56. The electric storage 14 is detachably and remountably connected to the first housing 40 via the first electric connector 56. The electric storage 14 is detachably and remountably connected to the housing 30 via the electric plug connector 56. The electric storage 14 is detachably and remountably connected to the first housing 40 via the electric connector 56.As seen in FIG. 8, the fuel cell system 10 further includes a second electrical connector 58. Thus, the fuel cell system 10 further includes the electrical connector 58.The second electrical connector 58 is provided on the power storage 14. The second electrical connector 58 is coupled to the energy store 14. For example, the second electrical plug connector 58 is fastened to the electrical energy store 14.As seen in FIG. 9, the second electrical connector 58 is detachably and remountably connected to the first electrical connector 56 to electrically connect the fuel cell 12 and the power storage 14. The power storage 14 is detachably and remountably connected to the housing 30 via the first electrical connector 56 and the second electrical connector 58. The electric storage 14 is detachably and remountably connected to the fuel cell 12 via the first electric connector 56 and the second electric connector 58.The electric storage 14 is detachably and remountably connected to the housing 30 via the second electric connector 58. The electric storage 14 is detachably and remountably connected to the first housing 40 via the second electric connector 58. The electric storage 14 is detachably and remountably connected to the housing 30 via the electric connector 58. The electric storage 14 is detachably and remountably connected to the first housing 40 via the electric connector 58.As seen in FIG. 9, the power storage 14 is configured to be detachably and re-attachable to the electrical device ED. The power storage 14 is configured to be removably and removably coupled to the bicycle electronic component ED 1. The power storage 14 is configured to be removably and removably coupled to the additional bicycle electronic component ED 2.The power storage 14 is configured to be detachably connected to the electric device ED for supplying power to the electric device ED. The power storage 14 is configured to be detachably connected to the bicycle electronic component ED 1 for supplying power to the bicycle electronic component ED 1. The power storage 14 is configured to be detachably connected to the additional bicycle electronic component ED 2 for supplying power to the additional bicycle electronic component ED 2. The power storage 14 is configured to be detachably connected to the additional bicycle electronic component ED 2 other than the bicycle electronic component ED 1 for supplying power to the additional bicycle electronic component ED 2. The power storage 14 is configured to be detachably connected to the device ED 3 for supplying power to the device ED 3.As can be seen in FIG. 10, the first electrical plug connector 56 is provided at least partially in the interior 50. The second electrical connector 58 is provided at least partially in the interior 50. The first electrical connector 56 is at least partially provided in the second interior 54. The second electrical connector 58 is at least partially provided in the second interior 54.In the present embodiment, the first electrical connector 56 is provided entirely in the internal space 50. The second electrical connector 58 is provided completely in the interior 50. The first electrical connector 56 is provided completely in the second interior 54. The second electrical connector 58 is provided completely in the second interior 54. However, the first electrical connector 56 may be partially provided in the interior 50 as needed or desired. The second electrical connector 58 may be partially provided in the interior 50 as needed or desired. The first electrical connector 56 may be partially provided in the second interior 54 as needed or desired. The second electrical connector 58 may be partially provided in the second interior 54 as needed or desired.The second internal space 54 is not in communication with the first internal space 52. the fuel cell system 10 includes an electric cable 59. the electric cable 59 is electrically connected to the first electric connector 56. The housing 30 includes a cable guide 30G. The cable guide 30G is attached to a fixing hole 40H of the first housing 40. The cable guide 30G includes a cable hole 30H. The electric wire 59 extends through the wire hole 30H. The cable guide 30G is attached to the first housing 40 to seal a gap provided between the cable guide 30G and the first housing 40. The cable guide 30G is configured to hold the electric cable 59 to seal a gap between the cable guide 30G and the electric cable 59. Thus, the second interior 54 is not in communication with the first interior 52.As seen in FIGS. 6 and 11, the housing 30 includes a sealing member 60. the sealing member 60 is provided at least partially between the first housing 40 and the second housing 42 in a state where the second housing 42 is attached to the first housing 40. The sealing member 60 is configured to seal a gap provided between the first housing 40 and the second housing 42. The sealing member 60 is configured to restrict or prevent entry of foreign matters into the second internal space 54 from the outside of the housing 30. The sealing member 60 is made of an elastic material such as elastomer, rubber, gel, or silicone. In the present embodiment, the sealing member 60 is provided entirely between the first housing 40 and the second housing 42 in the state where the second housing 42 is attached to the first housing 40. However, the sealing member 60 may be partially provided between the first housing 40 and the second housing 42 as needed or desired in the state where the second housing 42 is attached to the first housing 40.As seen in FIGS. 12 to 16, the fuel cell system 10 further includes a shock absorbing member 62, and the shock absorbing member 62 is provided at least partially between the power storage 14 and the housing 30. In the present embodiment, the shock absorbing member 62 is partially provided between the power storage 14 and the housing 30. However, the shock absorbing member 62 may be provided entirely between the power storage 14 and the case 30, as needed or desired. The shock absorbing member 62 is made of an elastic material such as elastomer, rubber, gel or silicone.The shock absorbing member 62 includes at least two shock absorbing portions. For example, the shock absorbing member 62 includes the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F. The shock absorbing portions 62A are provided at least partially between the power storage 14 and the housing 30. The shock absorbing portions 62B are provided at least partially between the power storage 14 and the housing 30. The shock absorbing portions 62C are provided at least partially between the power storage 14 and the housing 30. The shock absorbing portions 62D are provided at least partially between the power storage 14 and the housing 30. The shock absorbing portions 62E are provided at least partially between the power storage 14 and the housing 30. The shock absorbing portions 62F are provided at least partially between the power storage 14 and the housing 30. However, at least one of the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F may be omitted from the fuel cell system 10 as needed or as desired.In the present embodiment, the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F are separate portions. However, at least one of the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F may be integrally provided with another one of the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F as a one-piece unitary member, as needed or desired.As seen in FIGS. 17 and 18, the fuel cell system 10 further includes a heat conductive member 64. the heat conductive member 64 is attached to at least one of the housing 30, the fuel cell 12, and the power storage 14. In the present embodiment, the heat conductive member 64 is provided at least partially between the housing 30 and the fuel cell 12. The heat conductive member 64 is provided entirely between the case 30 and the fuel cell 12. However, the thermally conductive member 64 may be partially provided between the housing 30 and the fuel cell 12, if necessary or desired.The thermally conductive member 64 includes the thermally conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K. The heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K are attached to the fuel cell 12.The housing 30 has a first thermal conductivity. The thermally conductive element 64 has a second thermal conductivity. The second thermal conductivity is higher than the first thermal conductivity. The heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K have the second heat conductivity. At least one of the thermally conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K may have a thermal conductivity different from the thermal conductivity of another one of the thermally conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K.In the present embodiment, the heat conductive portions 64A, 64C, 64E, and 64G are separate portions. The heat conductive portions 64B, 64D, 64F, and 64H are separate portions. However, at least one of the thermally conductive portions 64A, 64C, 64E, and 64G may be provided as needed or desired with another one of the thermally conductive portions 64A, 64C, 64E, and 64G as a one-piece unitary member. At least one of the thermally conductive portions 64A, 64C, 64E, and 64G may be provided as a one-piece member with another of the thermally conductive portions 64A, 64C, 64E, and 64G, as needed or desired.The heat conductive member 64 is made of a material having the second thermal conductivity. The thermally conductive member 64 may be made of an elastic material such as elastomer, rubber, gel, or silicone. In a case where the heat conductive member 64 is made of an elastic material, the heat conductive member 64 may also be referred to as a shock absorbing member 64. The thermally conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K may also be referred to as shock absorbing portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K.In a case where the second thermal conductivity is higher than the first thermal conductivity, the material of the heat conductive member 64 includes a polymer, a filler, and an additive. Examples of the polymer include silicone resin (e.g., liquid or solid), acrylic resin, thermoplastic resin, and thermosetting resin. Examples of the filler are alumina, aluminum nitride, boron nitride and zinc oxide. Examples of additives include curing agents, plasticizers, crosslinking agents, and mold release agents. However, the material of the heat conductive member 64 is not limited to the above materials.As seen in FIGS. 19 and 20, a gap 66 is provided between the housing 30 and the fuel cell 12. The thermally conductive element 64 is at least partially provided in the gap 66. For example, gap 66 includes gaps 66A, 66B, 66C, 66D, 66E, 66F, 66G, 66H, and 66K. Each of the gaps 66A, 66B, 66C, 66D, 66E, 66F, 66G, 66H, and 66K is provided between the first housing 40 and the fuel cell 12. The thermally conductive portion 64A is at least partially provided in the gap 66A. The thermally conductive portion 64B is at least partially provided in the gap 66B. The thermally conductive portion 64C is at least partially provided in the gap 66C. The thermally conductive portion 64D is at least partially provided in the gap 66D. The thermally conductive portion 64E is at least partially provided in the gap 66E. The thermally conductive portion 64F is at least partially provided in the gap 66F. The thermally conductive portion 64G is at least partially provided in the gap 66G. The thermally conductive portion 64H is at least partially provided in the gap 66H. The thermally conductive portion 64K is at least partially provided in the gap 66K.The thermally conductive member 64 is in contact with or can be brought into contact with the housing 30. The thermally conductive member 64 is in contact with or may be brought into contact with the fuel cell 12. Each of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K is in contact with or can be brought into contact with the housing 30. Each of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K is in contact with or can be brought into contact with the fuel cell 12.The heat conductive member 64 is made of an elastic material. At least one of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K is made of an elastic material. Therefore, the heat conductive member 64 is likely to be in contact with the case 30 and the fuel cell 12. At least one of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K is likely to contact the housing 30 and the fuel cell 12.The second thermal conductivity of the thermally conductive member 64 is higher than the thermal conductivity of air. Thus, the heat generated by the fuel cell 12 can be transmitted from the fuel cell 12 to the case 30 via the heat conductive member 64, thereby lowering the temperature of the fuel cell 12.As seen in FIGS. 15 and 16, in a case where the shock absorbing member 62 has a thermal conductivity higher than the first thermal conductivity of the housing 30, the shock absorbing member 62 may be a thermally conductive member 62, and the shock absorbing portions 62A, 62B, 62C, 62D, 62E, and 62F may be thermally conductive portions 62A, 62B, 62C, 62D, 62E, and 62F. The heat conductive member 62 includes the heat conductive portions 62A, 62B, 62C, 62D, 62E, and 62F. Namely, the fuel cell system 10 may include the heat conductive member 62 attached to the power storage 14. Moreover, the thermally conductive member 62 may be free of an elastic material, if desired or desired. The shock absorbing member 62 may be omitted from the fuel cell unit 11 as needed or desired.As seen in FIG. 19, the fuel cell 12 includes at least two cells 70. the at least two cells 70 are arranged in a first direction D 1. The fuel cell 12 includes end plates 72A and 72B and fasteners 74. the at least two cells 70 are provided between the end plates 72A and 72B. The end plates 72A and 72B are coupled to hold the at least two cells 70 between the end plates 72A and 72B. The fasteners 74 couple the at least two cells 70 and the end plates 72A and 72B.As seen in FIG. 18, the fuel cell 12 includes a coupling member 72C. The coupling member 72C couples the end plates 72A and 72B. The coupling member 72C is fixed to the end plate 72A with a fixing member 75A. The coupling member 72C is fixed to the end plate 72B by a fixing member 75B.As seen in FIGS. 19 and 20, the heat conductive member 64 is in contact with or can be brought into contact with the end plates 72A and 72B. Each of the heat conductive portions 64A, 64C, 64E, and 64G is in contact with or can be brought into contact with the end plate 72A. Each of the heat conductive portions 64B, 64D, 64F, and 64H is in contact with or can be brought into contact with the end plate 72B. The heat conductive portion 64K is in contact with or can be brought into contact with the coupling member 72C.The heat conductive member 64 has an adhesive property. Each of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K has an adhesive property. Thus, the thermally conductive member 64 may be directly attached to at least one of the fuel cell 12 and the housing 30. Each of the thermally conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K may be directly attached to at least one of the fuel cell 12 and the housing 30. However, the heat conductive member 64 may be attached to at least one of the fuel cell 12 and the case 30 via an adhesive material such as adhesive or double-sided adhesive tape, as needed or desired. At least one of the heat conductive portions 64A, 64B, 64C, 64D, 64E, 64F, 64G, 64H, and 64K may be attached to at least one of the fuel cell 12 and the case 30 by an adhesive material such as adhesive or double-sided adhesive tape, as needed or desired.Each of the at least two cells 70 includes a first separator, a second separator, and a membrane electrode assembly (MEA). The MEA is provided at least partially between the first separator and the second separator. Hydrogen flows in at least one channel provided between the first separator and the MEA. Air flows in at least one channel provided between the second separator and the MEA.The MEA includes a polymer electrolyte membrane (PEM), an anode, and a cathode. The PEM is provided between the anode and the cathode. The anode and the cathode are electrically connected to the power storage 14. The anode is configured to cause the hydrogen to be split into positive hydrogen ions and negatively charged electrons. The PEM allows only positively charged ions to pass through the PEM to the cathode. The negatively charged electrons must flow from the anode to the cathode via an external circuit, e.g., the current storage 14, thereby generating an electric current. The anode and the cathode are electrically connected to the power storage 14 via a current control circuit (to be described later). The cathode is configured to cause the electrons and positively charged hydrogen ions to combine with oxygen and form water flowing out of the fuel cell 12. The structure of the cell 70 is known in the fuel cell art. For the sake of brevity, therefore, it will not be described in detail herein. The structure of the cell 70 is not limited to the above-described structure.As seen in FIG. 17, the fuel cell system 10 includes a first connector 76, a first connection pipe 78, a valve 80, a pressure sensor 82, a second connection pipe 84, and a first port 86. the first connector 76, the first connection pipe 78, the valve 80, the pressure sensor 82, the second connection pipe 84, and the first connection port 86 form a passage from the pipe 22 to the fuel cell 12.The tube 22 is configured for removable and reattachable connection to the first connector 76. The first connection pipe 78 is configured to connect the first connector 76 to the valve 80. The valve 80 is configured to open or close the passage between the first connector 76 and the fuel cell 12. Examples of the valve 80 are an electromagnetic valve and a solenoid valve. The valve 80 includes an electric motor. The valve 80 is electrically connected to the power storage 14. The valve 80 is configured to supply power from the power storage 14.The pressure sensor 82 is connected to the valve 80. The pressure sensor 82 is configured to detect the pressure in the passage from the valve 80 to the fuel cell 12. The pressure sensor 82 is electrically connected to the power storage 14. The pressure sensor 82 is configured to supply current from the current storage 14.The second connection pipe 84 connects the pressure sensor 82 and the first connection port 86. the first connection port 86 connects the second connection pipe 84 and the end plate 72A of the fuel cell 12. the fuel tank 20 is connected to the fuel cell 12 via the pipe 22, the first connector 76, the first connection pipe 78, the valve 80, the pressure sensor 82, the second connection pipe 84, and the first connection port 86.As seen in FIG. 18, the fuel cell system 10 includes a second connection terminal 88, a connection pipe 90, a valve 92, and a second connector 94. the second connection terminal 88, the connection pipe 90, the valve 92, and the second connector 94 form a passage between the fuel cell 12 and the second connector 94. the second connection terminal 88 is connected to the end plate 72B of the fuel cell 12. The connection pipe 90 connects the second connection port 88 and the valve 92, and the valve 92 is connected to the second connector 94. The second connector 94 is adapted for removable and reattachable connection to another tube. The valve 92 is configured to open or close the passage between the second connector 94 and the fuel cell 12. Examples of the valve 92 include an electromagnetic valve and a solenoid valve. The valve 92 includes an electric motor. The valve 92 is electrically connected to the power storage 14. The valve 92 is configured to supply power from the power storage 14.Namely, as seen in FIG. 7, the fuel cell unit 11 includes a ventilation fan 96. the fuel cell system 10 of the muscle-powered vehicle 2 includes the ventilation fan 96. the ventilation fan 96 is configured to ventilate at least the housing 30 and the fuel cell 12. The ventilation fan 96 is configured to ventilate the housing 30 and the fuel cell 12. The ventilation fan 96 is configured to ventilate the interior 50. The ventilation fan 96 is configured to generate an airflow into the first interior 52. The ventilation fan 96 is configured to supply air to the fuel cell 12. The ventilation fan 96 is electrically connected to the electricity storage 14. The ventilation fan 96 is configured to supply power from the power storage 14.The ventilation fan 96 is provided at least partially in the interior 50. The ventilation fan 96 is provided at least partially in the first interior 52. In the present embodiment, the ventilation fan 96 is provided entirely in the interior 50. The ventilation fan 96 is provided entirely in the first internal space 52. However, the ventilation fan 96 may be partially provided in the interior 50 as needed or desired. The ventilation fan 96 may be partially provided in the first internal space 52 as needed or desired.As seen in FIG. 3, in the assembled state in which the housing 30 is assembled to the vehicle body 8 of the muscle-powered vehicle 2, the ventilation fan 96 is provided at least partially above the fuel cell 12. In the present embodiment, the ventilation fan 96 is provided entirely above the fuel cell 12 in the assembled state. However, the ventilation fan 96 may be provided partially above the fuel cell 12 as needed or desired in the mounted state. The ventilation fan 96 may be provided at least partially below the fuel cell 12 when needed or desired in the assembled state.As seen in FIG. 4, the housing 30 includes a first vent opening 98. the first vent opening 98 is at least partially provided in the front surface 34. The first vent hole 98 includes at least one first vent hole 98A provided in the front surface 34. The first vent hole 98 includes at least two first vent holes 98A. Outside air enters the interior 50 through the first ventilation opening 98.The first housing 40 includes the first ventilation hole 98. the first housing 40 includes a first housing body 40A, a second housing body 40B, and a cover 40C. The second case body 40B is fixed to the first case body 40A with fixing members 40X (see, e.g., FIG. 11 ). The cover 40C is fixed to the first case body 40A with the fixing members 40D. The first ventilation hole 98 is provided at least partially on the cover 40C. The cover 40C includes the at least one first vent opening 98A.As seen in FIG. 21, the first ventilation hole 98 includes at least one first additional ventilation hole 98B. The first housing body 40A includes the at least one first additional ventilation hole 98B. The first housing body 40A includes the at least two first additional ventilation holes 98B. The structure of the first vent 98 is not limited to the illustrated embodiment.As seen in FIG. 5, the housing 30 includes a second ventilation opening 100. The second vent opening 100 is at least partially provided in a surface of the housing 30 other than the front surface 34. The second vent opening 100 is at least partially provided in at least one of the rear surface 36 and the side surface 37 and / or 38. The second ventilation hole 100 includes at least one second ventilation hole 100A provided in at least one of the back surface 36 and the side surface 37 and / or 38. The second ventilation hole 100 includes at least two second ventilation holes 100A. The second ventilation hole 100 is at least partially provided in the second case body 40B. The second housing body 40B includes the at least one second ventilation opening 100A. Air is discharged from the interior 50 through the second ventilation opening 100.In the present embodiment, the second ventilation hole 100 is provided entirely in the back surface 36. The at least two second ventilation holes 100A are provided entirely in the back surface 36. However, the second vent opening 100 may be provided entirely in at least one of the side surfaces 37 and 38 or in both the rear surface 36 and at least one of the side surfaces 37 and 38 as needed or desired.As seen in FIG. 7, the first ventilation opening 98 and the second ventilation opening 100 are in communication with the interior 50, the first ventilation opening 98 is in communication with the first interior 52, the second ventilation opening 100 is in communication with the first interior 52, the first ventilation opening 98 is in communication with the second ventilation opening 100 via the interior 50. The first ventilation opening 98 is in communication or in communication with the second ventilation opening 100 via the first interior 52.The ventilation fan 96 is configured to ventilate at least the housing 30 and the fuel cell 12 to generate an air flow from the first ventilation opening 98 to the second ventilation opening 100. The ventilation fan 96 is configured to ventilate at least the interior space 50 and the fuel cell 12 to generate an air flow from the first ventilation opening 98 to the second ventilation opening 100. The ventilation fan 96 is configured to ventilate at least the first interior space 52 and the fuel cell 12 to generate an air flow from the first ventilation opening 98 to the second ventilation opening 100. The air flows from the first ventilation opening 98 to the second ventilation opening 100 via the passages of the fuel cell 12 and the ventilation fan 96, thereby making the at least two cells 70 of the fuel cell 12 contactable with the oxygen contained in the air flowing from the first ventilation opening 98 to the second ventilation opening 100.The first interior space 52 is configured to be in communication with the outside air only through the first ventilation opening 98 and the second ventilation opening 100. Other gaps of the first housing 40 are sealed.The back surface 36 is spaced from the front surface 34 in a second direction D 2 intersecting the first direction D 1. The first vent 98 is spaced from the fuel cell 12 in the second direction D 2. The ventilation fan 96 is provided at least partially between the first ventilation hole 98 and the second ventilation hole 100 in the second direction D 2 intersecting the first direction D 1. The second direction D 2 is defined along the travel direction D 5. In the present embodiment, the second direction D 2 is perpendicular to the first direction D 1. The second direction D 2 intersects the traveling direction D 5. The second direction D 2 is non-parallel and non-perpendicular to the travel direction D 5. However, the second direction D 2 may also be non-perpendicular to the first direction D 1, if necessary or desired. The second direction D 2 may be parallel or perpendicular to the travel direction D 5 as needed or desired.As seen in FIG. 21, the fuel cell unit 11 includes a first filter 102. Namely, the fuel cell system 10 further includes the first filter 102. The first filter 102 is attached to the housing 30 to cover the first ventilation hole 98. The first filter 102 is air-permeable. The first filter 102 has a water repellent property. The first filter 102 is held between the first case body 40A and the cover 40C.As seen in FIGS. 5 and 15, the fuel cell unit 11 includes a second filter 104. Namely, the fuel cell system 10 further includes the second filter 104. The second filter 104 is attached to the housing 30 to cover the second ventilation hole 100. The second filter 104 is air-permeable. The second filter 104 has a water repellent property. The second filter 104 is held between the second case body 40B and the ventilation fan 96.As seen in FIG. 22, the fuel cell unit 11 includes an elastic member 105. The fuel cell system 10 further includes the elastic member 105. The elastic member 105 is provided between the housing 30 and the ventilation fan 96. The elastic member 105 is provided between the first housing 40 and the ventilation fan 96. The elastic member 105 is provided between the first housing 40 and the second filter 104. The ventilation fan 96 is fastened to the housing 30 by the fastening elements 106. The second filter 104 and the elastic member 105 are held between the housing 30 and the ventilation fan 96. The elastic member 105 is configured to reduce transmission of vibration from the ventilation fan 96 to the housing 30.The first mounting portion 44 includes a base plate 44A, a base plate 44B, a mounting base 44C, a guide member 44D, a guide plate 44E, and a guide plate 44F. The base plate 44A is fixed to the housing 30 by a fixing member 44G. The base plate 44B is fixed to the housing 30 by a fixing member 44H. The mounting base 44C is fixed to the base plates 44A and 44B with the fixing members 44K.As seen in FIG. 7, the mounting base 44C is fixed to the vehicle body 8 with fastening members 44M. The guide member 44D is fixed to the mounting base 44C with the fixing members 44N.As seen in FIG. 22, the guide plate 44E is fastened to the mounting base 44C with fasteners. The guide plate 44F is fastened to the mounting base 44C by fastening elements. The guide member 44D and the guide plates 44E and 44F are configured to guide the air discharged from the housing 30 via the second ventilation opening 100.As seen in FIG. 23, the ventilation fan 96 is arranged so as not to overlap the fuel cell 12 in a third direction D 3 intersecting the first direction D 1. The power storage 14 is arranged so as not to overlap the fuel cell 12 as viewed in the third direction D 3. In the present embodiment, the third direction D 3 is perpendicular to the first direction D 1. The third direction D 3 is parallel to the second direction D 2. However, the third direction D 3 may also be non-perpendicular to the first direction D 1, if necessary or desired. The third direction D 3 may be non-parallel to the second direction D 2 as needed or desired.The ventilation fan 96 is arranged to at least partially overlap the electricity storage 14 when viewed in a fourth direction D 4 intersecting the first direction D 1. In the present embodiment, the fourth direction D 4 is perpendicular to the first direction D 1. The fourth direction D 4 is parallel to the second direction D 2. However, the fourth direction D 4 may also be non-parallel to the second direction D 2 if necessary or desired.As seen in FIG. 23, the fuel cell system 10 of the muscle-powered vehicle 2 includes at least an electric switch and an indicator. In the present embodiment, the fuel cell system 10 includes an electric switch SW and an indicator 110. The indicator 110 is configured to supply power from the power storage 14. However, in the illustrated embodiment, at least one of the switch SW and the indicator 110 may be omitted.At least one of the electric switch SW and the indicator 110 is spaced apart from the fuel cell 12. At least one of the electric switch SW and the indicator 110 is provided on the housing 30. Each of the electric switch SW and the indicator 110 is spaced apart from the fuel cell 12. Each of the electric switch SW and the indicator 110 is provided on the housing 30. Each of the electric switch SW and the indicator 110 is provided on the second housing 42. However, at least one of the electric switch SW and the indicator 110 may be provided on a portion of the fuel cell system 10 other than the housing 30.As seen in FIG. 2, the electric switch SW is configured to receive a user input U. The user input U is indicative of at least one of: supply of power from the fuel cell system 10 to the electric device ED; and at least one of turning on and off the fuel cell system 10.In the present embodiment, the user input U is an indicator for supplying power from the fuel cell system 10 to the electric device ED, and for turning on and off power of the fuel cell system 10. The power supply user input U 1 indicates that the electric device ED is supplied with power from the fuel cell system 10. The power-on user input U 2 indicates the turning-on of the fuel cell system 10. The power-off user input U 3 indicates the power-off of the fuel cell system 10. The power supply user input U 1 may include, for example, normal pressing of the electric switch SW in a state where the fuel cell system 10 is turned on. The power-on user input U 2 may include long pressing of the electric switch SW in the state where the fuel cell system 10 is turned off. The power-off user input U 3 may include normal pressing of the electric switch SW in a state where the fuel cell system 10 is turned on. The user input U may display another input related to the fuel cell system 10 as needed or desired.The indicator 110 is configured to display at least one of (a) remaining amount information(s) regarding the remaining amount of the current stored in the power storage 14; (a) power supply information(s) regarding the power supply from the fuel cell system 10 to the electric device ED; and (a) system information(s) regarding a system of the fuel cell system 10. examples of the remaining amount information(s) include the state of charge (SOC) of the power storage 14. examples of the power supply information(s) include a voltage value or a current value supplied from the fuel cell system 10 to the electric device ED. Examples of the system information(s) include a power-on state or a power-off state of the fuel cell system 10.Examples of the indicator 110 include a light emitter. The light emitter includes, for example, a light emitting diode (LED). In the present embodiment, the indicator 110 is configured to display the remaining amount information(s), the power supply information(s), and the system information(s). The indicator 110 is configured to display the remaining amount information(s) in a first manner. The indicator 110 is configured to display the power supply information(s) in a second manner. The indicator 110 is configured to display the system information(s) in a third manner. The first manner is different from the second and third manner. The second manner is different from the third manner.For example, the indicator 110 is configured to illuminate in a first color in a case where the remaining amount of the electric storage 14 is higher than a remaining amount threshold value. In the first manner, the indicator 110 is configured to emit light in a first additional color in a case where the remaining amount of the power storage 14 is equal to or lower than the remaining amount threshold value. The first additional color is different from the first color. In the second manner, the indicator 110 is configured to emit light in a second color while supplying power from the fuel cell system 10 to the electric device ED. In the second manner, the indicator 110 is configured to blink at the second color at a second interval while supplying power from the fuel cell system 10 to the electric device ED. The second color may be the same as at least one of the first color and the first additional color. In the third manner, the indicator 110 is configured to emit light having a third color at a third interval in a case where the system of the fuel cell system 10 has a problem. In the third manner, the indicator 110 is configured to blink with the third color in the case where the system of the fuel cell system 10 has a problem. The third color may be the same as at least one of the first color, the first additional color, and the second color. The third interval may be different from the second interval. The manners of displaying the indicator 110 are not limited to the above-mentioned manners. The manners of displaying the indicator 110 may include at least one other manner different from the first manner, the second manner, and the third manner, as needed or desired. The indicator 110 may be configured to display, as needed or desired, information(s) in at least one other manner different from the first manner, the second manner, and the third manner.As seen in FIG. 7, the fuel cell system 10 includes a gas sensor 112. The gas sensor 112 is configured to detect the gas concentration of a flammable gas. For example, the gas sensor 112 is configured to detect the gas concentration of hydrogen. The gas sensor 112 is coupled to the housing 30. The gas sensor 112 is provided in the internal space 50. The gas sensor 112 is provided in the first internal space 52. The gas sensor 112 is configured to detect the gas concentration of the combustible gas present in the internal space 50. The gas sensor 112 is configured to detect the gas concentration of hydrogen existing in the first internal space 52.As seen in FIG. 2, the fuel cell system 10 includes an electronic control circuit EC, a first power control circuit PC 1, and a second power control circuit PC 2. The electronic control circuit EC is electrically connected to the first power control circuit PC 1, the second power control circuit PC 2, and the indicator 110. The electronic control circuit EC is configured to control the first power control circuit PC 1, the second power control circuit PC 2, and the indicator 110.The electronic control circuit EC includes a processor EC 1 and a memory EC 2. The fuel cell system 10 further includes a substrate EC 3. The fuel cell system 10 includes a system bus EC 4. The processor EC 1 is coupled to the memory EC 2. The memory EC 2 is coupled to the processor EC 1. The processor EC 1 and the memory EC 2 are electrically mounted on the substrate EC 3. The processor EC 1 is electrically connected to the memory EC 2 via the substrate EC 3 and the system bus EC 4. The memory EC 2 is electrically connected to the processor EC 1 via the substrate EC 3 and the system bus EC 4. The electronic control circuit EC includes, for example, a semiconductor. The processor EC 1 includes a semiconductor. The memory EC 2 includes a semiconductor. However, the electronic control circuit EC may be free of a semiconductor as needed or desired. The processor EC1 may be free of a semiconductor if necessary or desired. The memory EC2 may be free of a semiconductor if necessary or desired.The processor EC 1 includes, for example, at least a central processing unit (CPU), a micro processing unit (MPU), and a memory controller. The memory EC 2 is electrically connected to the processor EC 1. The memory EC 2 includes, for example, at least one of a volatile memory and a nonvolatile memory. Examples of the volatile memory include a random access memory (RAM) and a dynamic random access memory (DRAM). Examples of the nonvolatile memory include a read only memory (ROM), an electrically erasable programmable ROM (EEPROM), and a magnetic disk. The memory EC2 contains memory areas each having an address. The processor EC 1 is configured to control the memory EC 2 to store data in the storage areas of the memory EC 2 and to read data from the storage areas of the memory EC 2. The processor EC 1 may also be referred to as a hardware processor EC 1 or a processor circuit or circuit EC 1. The memory EC 2 may also be referred to as a hardware memory EC 2 or a memory circuit EC 2. The memory EC 2 may also be referred to as a non-transitory computer readable storage medium EC 2. Namely, the electronic control circuit EC includes the non-transitory computer readable storage medium EC 2.The electronic control circuit EC is configured to execute at least one control algorithm of the fuel cell system 10. For example, the electronic control circuit EC is programmed to execute at least one control algorithm of the fuel cell system 10. The memory EC 2 stores at least one program including at least one program instruction. The at least one program is read into the processor EC 1, and thereby the at least one control algorithm of the fuel cell system 10 is executed based on the at least one program.The configuration of the electronic control circuit EC is not limited to the above configuration. The configuration of the electronic control circuit EC is not limited to the processor EC 1 and the memory EC 2. The electronic control circuit EC may be realized by hardware alone or a combination of hardware and software. In the present embodiment, the processor EC 1 and the memory EC 2 are integrated as a single chip, e.g., an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). However, the processor EC 1 and the memory EC 2 may be separate chips as needed or desired. The electronic control circuit EC may include the processor EC 1, the memory EC 2, the substrate EC 3, and the system bus EC 4, as needed or desired. The electronic control circuit EC may be at least two electronic controllers provided separately.The electronic control circuit EC may include at least two electronic controllers provided separately. The at least one control algorithm of the fuel cell system 10 may be executed by the at least two electronic controllers as needed or as desired. The electronic control circuit EC may include at least two hardware processors provided separately from each other. The electronic control circuit EC may include at least two separately provided hardware memories. The at least one control algorithm of the fuel cell system 10 may be executed by the at least two hardware processors as needed or desired. The at least one control algorithm of the fuel cell system 10 may be stored in the at least two hardware memories as needed or desired. The electronic control circuit EC may include at least two circuit boards which are separately provided as needed or desired. The electronic control circuit EC may include at least two separately provided system buses, if necessary or desired.The first power control circuit PC 1 is configured to convert a first voltage supplied from the fuel cell 12 into a second voltage. The first power control circuit PC 1 includes a DC / DC converter configured to convert the first voltage supplied from the fuel cell 12 into the second voltage. For example, the second voltage is lower than the first voltage. The second voltage may be equal to or higher than the first voltage, if desired or desired.The first power control circuit PC 1 is configured to control charging of the power storage 14. The first power control circuit PC 1 is configured to charge the power storage 14 using the power supplied from the fuel cell 12. The first power control circuit PC 1 is configured to apply the second voltage to other electronic components such as the electronic control circuit EC, the valve 80, the pressure sensor 82, the valve 92, the ventilation fan 96, the electric switch SW, the indicator 110, and the gas sensor 112.The second power control circuit PC 2 is configured to convert the second voltage to a third voltage. The second power control circuit PC 2 includes a DC / DC converter configured to convert the second voltage to the third voltage. The third voltage is higher than the second voltage, for example. The third voltage may be equal to or lower than the second voltage, if desired or desired.The second power control circuit PC 2 is electrically connected to the electrical connector terminal CN. The second power control circuit PC 2 is configured to apply the third voltage to another device such as the electrical device ED via the electrical connector terminal CN.The power storage 14 includes at least one cell and a power management circuit. The power management circuit is configured to determine a voltage for each of the at least one cell. The electronic control circuit EC is configured to be electrically connected to the power management circuit for receiving the detected voltage from the power management circuit. Thus, the electronic control circuit EC is configured to determine the state of the power storage 14 from the power storage 14. The power storage 14 may include other circuitry, as needed or if desired, such as protection circuitry configured to protect the power storage 14 from overcharging, overdischarge, and / or over-current.The electronic control circuit EC is configured to control the power generation of the fuel cell 12 and the charging of the electric storage 14. The electronic control circuit EC is electrically connected to the valve 80, the pressure sensor 82, the valve 92, the ventilation fan 96, and the gas sensor 112. The electronic control circuit EC is configured to control the opening or closing of the valve 80 based on / information(s) regarding the fuel cell system 10. The electronic control circuit EC is configured to control the opening or closing of the valve 92 based on / information(s) regarding the fuel cell system 10. The electronic control circuit EC is configured to control the ventilation fan 96 to turn on or off based on the information(s) regarding the fuel cell system 10. The information(s) regarding the fuel cell system 10 include / contain a remaining amount of the electric storage 14, the pressure detected by the pressure sensor 82, and the user input U received from the electric switch SW.For example, the electronic control circuit EC is configured to control the ventilation fan 96 to turn it on in a case where the remaining amount of the electricity storage 14 is below a remaining amount threshold value. The electronic control circuit EC is configured to control the valves 80 and 92 to open in a case where the remaining amount of the electric storage 14 is lower than the remaining amount threshold value. In this way, air and hydrogen are supplied to the fuel cell 12, and the fuel cell 12 starts generating power. The electronic control circuit EC may be configured to control the rotation speed of the ventilation fan 96 depending on the temperature of the fuel cell 12 or the remaining amount of the electric power storage 14. The electronic control circuit EC is configured to control the ventilation fan 96 to turn on in a case where the gas concentration detected by the gas sensor 112 is higher than a concentration threshold.The electronic control circuit EC is configured to control the valves 80 and 92 to close in a case where the remaining amount of the electric storage 14 is equal to or higher than the remaining amount threshold value. The electronic control circuit EC is configured to control the ventilation fan 96 to turn off in a case where the remaining amount of the electricity storage 14 is equal to or greater than the remaining amount threshold value. The electronic control circuit EC may be configured to control the valves 80 and 92 to close in a case where the pressure detected by the pressure sensor 82 is below a pressure threshold.The fuel cell system 10 may include a wired communicator circuit. The wired communicator circuit is configured to communicate with another wired communicator circuit via an electric cable. The wired communicator circuit is electrically connected to the connector electrical terminal CN. For example, the wired communicator circuit is configured to communicate with another wired communicator circuit of the electric device ED via an electric cable. The wired communicator circuit is configured to communicate with another wired communicator circuit of the bicycle electronic component ED 1 via the electric cable ED 11. The wired communicator circuit is configured to communicate with another wired communicator circuit of the additional bicycle electronic component ED 2 via the additional electric cable ED 21. The wired communicator circuit is configured to communicate with another wired communicator circuit of the device ED 3 via the electric cable ED 31.For example, the wired communicator circuit is configured to communicate with another wired communicator circuit via an electric cable using the power line communication technology. In power line communication (PLC), data is transmitted via a line that is also used simultaneously for power transmission or power distribution to devices such as the electrical device ED.For example, the electric cable ED 11, ED 21, or ED 31 includes a ground line and a power line detachably connected to a serial bus formed by communication interfaces. In the present embodiment, the wired communicator circuit is configured to communicate with another wired communicator circuit via the power line using the PLC technology. The wired communicator circuit is configured to superimpose signals on a power source voltage applied from the power storage 14 to the electric line ED 11, ED 21, or ED 31. The wired communicator circuit is configured to receive a signal from the electronic control circuit EC and superimpose the signal on the power source voltage. The wired communicator circuit is configured to disconnect, from the power source voltage, signals superimposed on the power source voltage of the electric cable ED 11, ED 21, or ED 31. The wired communicator circuit is configured to transmit the signals separated from the power source voltage to the electronic control circuit EC.The fuel cell system 10 may include a radio communicator circuit configured to wirelessly communicate with another radio communicator circuit as needed or desired. As used herein, the term "radio communicator" or "radio communicator circuit" includes a receiver, a transmitter, a transceiver, a transceiver, and refers to any device or devices, separate or combined, capable of transmitting and / or receiving radio communication signals, including switching signals or control, command, or other signals related to a function of the component to be controlled. Here, the radio communicator circuit is configured to receive at least one radio signal. The radio communicator circuit includes, for example, a two-way radio transmitter / receiver that performs two-way radio communication by using the radio receiver to wirelessly receive signals and a radio transmitter to wirelessly transmit signals.The radio communicator circuit may use radio frequency (RF) signals, ultra wide band communication signals, radio frequency identification (RFID), Wi-Fi (registered trademark), Zigbee (registered trademark), ANT+ (registered trademark), or Bluetooth (registered trademark), or any other type of communication protocols suitable for radio short range communication as understood in the field of muscle-powered vehicles.It should also be appreciated that the radio communicator circuit may transmit the signals at a particular or randomly selected frequency and / or with an identifier such as a particular code to distinguish the radio signal from other radio signals. In this way, both the fuel cell system 10 and the electrical device ED can identify to which signals should be reacted and to which signals are not to be reacted. Thus, both the fuel cell system 10 and the electric device ED may ignore the signals of other wireless communicators of other electric devices.As seen in FIG. 2, the substrate EC 3 is electrically connected to at least one of the electric switch SW and the indicator 110. At least one of the electric switch SW and the indicator 110 is electrically connected to the substrate EC 3. The substrate EC 3 is electrically connected to the electric switch SW in a case where the fuel cell system 10 includes the electric switch SW. The substrate EC 3 is electrically connected to the indicator 110 in a case where the fuel cell system 10 includes the indicator 110.The substrate EC 3 is electrically connected to the electronic control circuit EC, the first power control circuit PC 1, the second power control circuit PC 2, the valve 80, the pressure sensor 82, the valve 92, the ventilation fan 96, and the gas sensor 112.As seen in FIG. 7, the substrate EC 3 is provided at least partially in the internal space 50. The electronic control circuit EC is provided at least partially in the internal space 50. The first power control circuit PC 1 is provided at least partially in the internal space 50. The second power control circuit PC 2 is provided at least partially in the internal space 50.The substrate EC 3 is provided entirely in the internal space 50. The electronic control circuit EC is provided entirely in the internal space 50. The first power control circuit PC 1 is provided entirely in the internal space 50. The second power control circuit PC 2 is provided entirely in the internal space 50. However, the substrate EC 3 may be partially provided in the internal space 50 as needed or desired. The electronic control circuit EC may be partially provided in the internal space 50 as needed or desired. The first power control circuit PC 1 may be partially provided in the internal space 50 as needed or desired. The second power control circuit PC 2 may be partially provided in the interior 50 as needed or as desired.In the present embodiment, the substrate EC 3 is provided entirely in the first internal space 52. The electronic control circuit EC is provided entirely in the first internal space 52. The first power control circuit PC 1 is provided entirely in the first internal space 52. The second power control circuit PC 2 is provided entirely in the first internal space 52. However, the substrate EC 3 may be partially provided in the first internal space 52 as needed or desired. The electronic control circuit EC may be partially provided in the first internal space 52 as needed or desired. The first power control circuit PC 1 may be partially provided in the first internal space 52 as needed or as desired. The second power control circuit PC 2 may be partially provided in the first internal space 52 as needed or as desired.The first housing 40 includes a third housing body 40E and an additional cover 40F. The third case body 40E and the additional cover 40F are fixed to the second case body 40B with fasteners 40G.The first internal space 52 includes a third internal space 52A and a fourth internal space 52B. The first housing body 40A, the second housing body 40B, and the third housing body 40E define the third internal space 52A. The third housing body 40E and the additional cover 40G define the fourth internal space 52B. The third interior 52A may be in communication with the fourth interior 52B. The third internal space 52A may be free from communication with the fourth internal space 52B.As seen in FIGS. 7 and 20, the fuel cell 12 is provided at least partially in the third internal space 52A. The substrate EC 3 is provided at least partially in the fourth internal space 52B. The electronic control circuit EC is provided at least partially in the fourth internal space 52B. The first power control circuit PC 1 is provided at least partially in the fourth internal space 52B. The second power control circuit PC 2 is provided at least partially in the fourth internal space 52B.In the present embodiment, the fuel cell 12 is provided entirely in the third internal space 52A. The substrate EC 3 is provided entirely in the fourth internal space 52B. The electronic control circuit EC is provided entirely in the fourth internal space 52B. The first power control circuit PC 1 is provided entirely in the fourth internal space 52B. The second power control circuit PC 2 is provided entirely in the fourth internal space 52B.However, the fuel cell 12 may be partially provided in the third internal space 52A, if necessary or desired. The substrate EC 3 may be partially provided in the fourth internal space 52B as needed or desired. The electronic control circuit EC may be partially provided in the fourth internal space 52B as needed or desired. The first power control circuit PC 1 may be partially provided in the fourth internal space 52B as needed or desired. The second power control circuit PC 2 may be partially provided in the fourth internal space 52B as needed or desired.As seen in FIG. 22, at least one of the electric switch SW and the indicator 110 is provided at least partially outside the housing 30. The at least one of the electric switch SW and the indicator 110 is provided entirely outside the housing 30. The electric switch SW is provided entirely outside the housing 30. The indicator 110 is provided entirely outside the housing 30. However, at least one of the electric switch SW and the indicator 110 may be partially provided outside the housing 30, as needed or as desired. The electric switch SW may be partially provided outside the housing 30, as needed or desired. The indicator 110 may be provided partially outside the housing 30, if desired or desired.At least one of the electric switch SW and the indicator 110 is coupled to the housing 30. At least one of the electric switch SW and the indicator 110 is fixed to the housing 30. The electric switch SW and the indicator 110 are fixed to the housing 30 with the fasteners 42F. The electric switch SW and the display device 110 are fixed to the second housing 42 with the fixing members 42F. However, at least one of the electric switch SW and the indicator 110 may be fixed to a member other than the second housing 42 as needed or as desired. At least one of the electric switch SW and the indicator 110 may be attached to a member other than the housing 30 as needed or as desired.The second housing 42 includes a housing body 42A, a first fixing portion 42B, a second fixing portion 42C, and a sealing portion 42S. The first fixing portion 42B is provided outside the case body 42A. The second fixing portion 42C is provided inside the case body 42A. The first fastening portion 42B is fastened to the second fastening portion 42C by the fastening members 42F. The sealing portion 42S is provided between the first fixing portion 42B and the second fixing portion 42C to seal gaps among the case body 42A, the first fixing portion 42B, and the second fixing portion 42C. The electric switch SW is held between the first fixing portion 42B and the second fixing portion 42C. The indicator 110 is held between the first attachment portion 42B and the second attachment portion 42C.As seen in FIGS. 7 and 23, at least one of the electric switch SW and the indicator 110 is provided closer to the power storage 14 than to the fuel cell 12. The electric switch SW is provided closer to the electric storage 14 than to the fuel cell 12. The indicator 110 is provided closer to the power storage 14 than to the fuel cell 12. However, at least one of the electric switch SW and the indicator 110 may be farther from the power storage 14 than from the fuel cell 12 as needed or desired.As seen in FIGS. 2 and 24, the electrical connector 58 is configured to be electrically connected to the device ED 3 other than the bicycle electronic component ED 1. The electrical connector 58 is configured to be electrically connected to the device ED 3 other than the additional bicycle electronic component ED 2.For example, as seen in FIG. 2, the electrical connector 58 is configured to be electrically connected to the device ED 3 via the electrical cable 59, the first power control circuit PC 1, the substrate EC 3, the system bus EC 4, the second power control circuit PC 2, the electrical connector terminal CN, and an electrical cable ED 31.As seen in FIG. 24, the electrical connector 58 is configured to be electrically connected to the device ED 3 via an electrical cable ED 32, for example, or in a state where the power storage 14 is detached from the electrical connector 56, without an electrical cable directly to the device ED 3. In this way, the power storage 14 can be used as a portable power source for the device ED 3 different from the bicycle electronic component ED 1 and the bicycle additional electronic component ED 2.The arrangement of the power storage 14 is not limited to the illustrated embodiment. As seen in FIG. 25, the power storage 14 may be provided in the first internal space 52 of the housing 30, for example, as needed or desired. The power storage 14 may be provided in the fourth internal space 52B of the first internal space 52, as needed or desired. As seen in FIG. 26, the fuel cell 12 and the power storage 14 may be provided side by side as needed or desired when viewed along the second direction D 2. As seen in FIG. 27, the power storage 14 may be further provided outside the housing 30, as needed or desired. In the modification illustrated in FIG. 27, the power storage 14 is fixed to the mounting portion 32 with the fixing members 14A. The electrical connector 58 of the electric storage 14 is electrically connected to the electrical connector 56 of the housing 30 when the fuel cell unit 11 is mounted on the mounting portion 32.In the above embodiments and their modifications, the fuel cell 12 is provided outside the vehicle body 8 of the muscle powered vehicle 2. However, as seen in FIG. 28, the fuel cell 12 may be configured to be at least partially provided in the vehicle body 8 of the muscle-powered vehicle 2. For example, as shown in FIG. 29, the arrangement of the parts of the fuel cell system 10 may be modified as needed or desired. As seen in FIGS. 25 and 26, air is introduced from an air inlet hole of the vehicle body 8. The exhaust air is discharged through an exhaust hole 8B of the vehicle body 8. The water generated by the fuel cell 12 may be discharged through a drain port 8C of the vehicle body 8.In the above embodiments and the modifications thereof, the shock absorbing member 62 is in the form of a plate. However, the shock absorbing member 62 may have shapes other than the plate shape, if necessary or desired. As seen in FIG. 30, the shock absorbing member 62 may have, for example, a spherical or columnar shape. In the modification illustrated in FIG. 30, the second thermal conductivity of the shock absorbing member 62 may be equal to or lower than the first thermal conductivity of the housing 30, as needed or as desired.In the present application, the term "comprising" and its derivatives, as used herein, are to be understood as open ended terms that specify the presence of stated features, elements, components, groups, integers, and / or steps, but do not preclude the presence of other unspecified features, elements, components, groups, integers, and / or steps. This concept also applies to words of similar significance, for example to the terms "have", "include" and their derivatives.The terms "member", "section", "portion", "part", "element", "body" and "structure", when used in the singular, may have the dual meaning of a single part or a plurality of parts.The ordinal numbers such as "first" and "second" mentioned in the present application are merely identifiers, but have no other meaning, for example, a certain order or the like. Moreover, for example, the term "first element" itself does not imply the presence of a "second element", and the term "second element" itself does not imply the presence of a "first element".The term "pair" as used herein may include the configuration in which the pair of elements have different shapes or structures from each other, in addition to the configuration in which the pair of elements have the same shapes or structures as each other.The terms "a" (or "an / s"), "one or more", and "at least one" may be used interchangeably herein.The phrase "at least one of" as used in this disclosure means "one or more" of a desired selection. For example, the phrase "at least one of" as used in this disclosure means "only a single selection" or "both of two choices" when the number of choices is two. For example, the phrase "at least one of" as used in this disclosure means "only a single choice" or "any combination of equal to or more than two choices" when the number of choices is equal to or greater than three. The phrase "at least one of A, B, and C" includes (1) A alone, (2), B alone, and (3) both A and B. The phrase "at least one of A, B, and C" includes (1) A alone, (2), B alone, (3) C alone, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all A, B, and C. In other words, the phrase "at least one of A and B" in this disclosure does not mean "at least one of A and at least one of B.".Finally, terms such as "substantially", "about" and "approximately" as used herein mean an appropriate deviation from the modified term such that the end result is not substantially changed. All numerical values described in the present application may be construed to include the terms "substantially", "approximately", and "approximately".It is to be understood that numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as described herein.REFERENCE CHARACTER10 Fuel cell system 30 Housing 34 Front surface 50 Inner space 98 First ventilation opening 100 Second ventilation opening 12 Fuel cell 96 Ventilation fan 14 Electricity storage 36 Rear surface 37; 38; 37, 38 Side surface 98A First ventilation hole 102 First filter 104 Second filter 40 First housing 42 Second housing 52 First inner space 54 Second inner space SW An electric switch 110 Indicator EC 3 Substrate 56; 56, 58 Electric connector

Claims

A fuel cell system for a muscle-powered vehicle, the fuel cell system comprising: a housing including a front surface configured to face a traveling direction in which the muscle-powered vehicle travels forward, the housing including an interior space, a first ventilation opening, and a second ventilation opening, the first ventilation opening and the second ventilation opening being in communication with the interior space, the first ventilation opening being provided at least partially in the front surface, and the second ventilation opening being provided at least partially in a surface of the housing other than the front surface; a fuel cell configured to generate power, and provided at least partially in the interior space; and a ventilation fan configured to ventilate at least the housing and the fuel cell to generate an air flow from the first ventilation opening to the second ventilation opening.The fuel cell system of claim 1, further comprising a power storage configured to store power generated by the fuel cell, wherein the power storage is removably and remountably coupled to the housing.The fuel cell system of claim 2, wherein the power storage is configured to be electrically connected to a device to supply power to the device, the device being inoperative with respect to the muscle powered vehicle.The fuel cell system of claim 3, wherein the power storage is configured for detachable and reattachable coupling to the electrical device.The fuel cell system of claim 3 or 4, further comprising at least one electrical switch and an indicator.The fuel cell system of claim 5, wherein at least one of the electrical switch and the indicator is electrically connected to a substrate.The fuel cell system according to any one of claims 2 to 6, wherein the electric power storage is configured to be electrically connected to a bicycle electronic component, and the bicycle electronic component includes at least one of a gear changer, a suspension, a height adjustable seatpost, a brake device, a lighting device, a display device, and an assist driving device.The fuel cell system according to claim 7, wherein the power storage is configured to be detachably connected to an additional electronic bicycle component other than the electronic bicycle component, to supply power to the additional electronic bicycle component, and the additional electronic bicycle component includes another component of at least one of the gear changer, the suspension, the height adjustable seatpost, the brake device, the lighting device, the display device, and the assist driving device.The fuel cell system according to any one of claims 2 to 8, further comprising an electrical connector, wherein the power storage is detachably and remountably connected to the housing via the electrical connector.The fuel cell system according to any one of claims 1 to 9, wherein the housing includes a back surface and a side surface, the back surface is disposed on a back surface of the front surface, and the second ventilation hole is provided at least partially on at least one of the back surface and the side surface.The fuel cell system of claim 10, wherein the fuel cell includes at least two cells arranged in a first direction, and the back surface is spaced apart from the front surface in a second direction intersecting the first direction.The fuel cell system of claim 11, wherein the first vent is spaced from the fuel cell in the second direction.The fuel cell system according to claim 11 or 12, wherein the second direction is defined along the traveling direction.The fuel cell system according to any one of claims 1 to 13, wherein the first ventilation hole includes at least one first ventilation hole provided in the front surface.The fuel cell system according to any one of claims 1 to 14, further comprising a first filter attached to the case to cover the first ventilation hole.The fuel cell system according to claim 15, wherein the first filter is air-permeable.The fuel cell system according to claim 15 or 16, wherein the first filter has a water repellency.The fuel cell system according to any one of claims 1 to 17, further comprising a second filter that is attached to the case and covers the second ventilation hole.The fuel cell system of claim 18, wherein the second filter is air permeable.The fuel cell system according to claim 18 or 19, wherein the second filter has a water repellent property.The fuel cell system according to any one of claims 1 to 20, wherein the fuel cell includes at least two cells arranged in a first direction, and the ventilation fan is provided at least partially between the first ventilation hole and the second ventilation hole in a second direction intersecting the first direction.The fuel cell system according to any one of claims 1 to 21, wherein the ventilation fan is provided at least partially in the internal space.The fuel cell system according to any one of claims 1 to 22, wherein the fuel cell includes at least two cells arranged in a first direction, and the ventilation fan is arranged to avoid overlapping with the fuel cell when viewed in a third direction intersecting the first direction.The fuel cell system according to any one of claims 1 to 23, wherein the ventilation fan is provided at least partially above the fuel cell in an assembled state in which the housing is assembled to a vehicle body of the muscle-powered vehicle.The fuel cell system according to any one of claims 1 to 24, wherein the fuel cell includes at least two cells arranged in a first direction, and the ventilation fan is arranged to at least partially overlap with the power storage when viewed in a fourth direction intersecting the first direction.Fuel cell system according to one of Claims 1 to 25, in which the electricity storage unit is provided at least partially in the interior.The fuel cell system according to any one of claims 1 to 26, wherein the housing includes a first housing and a second housing attached to the first housing, the internal space includes a first internal space and a second internal space, the first housing defines the first internal space, the first housing and the second housing define the second internal space, the fuel cell is at least partially provided in the first internal space, and the power storage is at least partially provided in the second internal space.The fuel cell system according to claim 27, wherein the second internal space is not in communication with the first internal space, and the ventilation fan is provided at least partially in the first internal space.The fuel cell system according to any one of claims 1 to 28, wherein the fuel cell is configured to be provided at least partially in a vehicle body of the muscle-powered vehicle.

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