Fuel cell system and vehicle

Abstract

The utility model provides a fuel cell system and a vehicle, the fuel cell system comprises a shell, a fuel stack and a direct current converter, the shell encloses to form a sealing cavity, the fuel stack is arranged in the sealing cavity, the fuel stack comprises a stack body, a positive collector plate and a negative collector plate, the positive collector plate and the negative collector plate are respectively connected with the stack body, and the direct current converter is arranged in the sealing cavity. The electric pile body is fixedly connected with the shell, the direct-current converter is arranged in the sealing cavity, the direct-current converter comprises a converter body, a positive plate and a negative plate, the positive plate and the negative plate are respectively connected with the converter body, the converter body is fixedly connected with the shell, the positive plate is electrically connected with the positive collector plate, and the negative plate is electrically connected with the negative collector plate. The fuel stack and the direct-current converter are arranged in the same shell at the same time, the size and weight of the fuel cell system are reduced, the current transmission distance of the fuel stack and the direct-current converter is short, the current transmission speed between the fuel stack and the direct-current converter is further high, and loss is small.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and in particular to a fuel cell system and vehicle. Background Technology

[0002] A fuel cell system mainly consists of components such as a fuel cell stack, a DC-DC converter, an air compressor controller, and a hydrogen circulation pump controller. Among these, the large current exchange between the fuel cell stack and the DC-DC converter directly affects the operation of the entire fuel cell system. In related technologies, the fuel cell stack and the DC-DC converter in a fuel cell system require separate sealed housings, which are then fixed together and connected via connectors or copper busbars to achieve current exchange. This is not conducive to the miniaturization design of hydrogen fuel cell systems. Utility Model Content

[0003] The technical problem this application aims to solve is that in existing fuel cell systems, both the fuel stack and the DC-DC converter require separate sealed housings, which is detrimental to the miniaturization design of hydrogen fuel cell systems. This application provides a fuel cell system and vehicle that reduces the size and weight of the fuel cell system.

[0004] In a first aspect, this application provides a fuel cell system, the fuel cell system comprising:

[0005] A housing that encloses and forms a sealed cavity;

[0006] A fuel cell stack is disposed within the sealed cavity. The fuel cell stack includes a stack body, a positive current collector plate, and a negative current collector plate. The positive current collector plate and the negative current collector plate are respectively connected to the stack body. The stack body and the housing are fixedly connected.

[0007] A DC-DC converter is disposed within the sealed cavity. The DC-DC converter includes a converter body, a positive plate, and a negative plate. The positive plate and the negative plate are respectively connected to the converter body. The converter body and the housing are fixedly connected. The positive plate is electrically connected to the positive current collector, and the negative plate is electrically connected to the negative current collector.

[0008] The fuel cell system provided in this application comprises a sealed cavity housing both the fuel cell stack and the DC-DC converter, resulting in a more integrated fuel cell system and reduced size and weight. Furthermore, housing both the fuel cell stack and the DC-DC converter within a single casing allows for shorter current transmission distances between them, leading to faster current transmission speeds, lower current transmission losses, shorter power response time, and higher reliability of the electrical connection between the fuel cell stack and the DC-DC converter. This also reduces the cost of the electrical connection between the fuel cell stack and the DC-DC converter and further enhances the integration of the fuel cell system.

[0009] In some embodiments, the fuel cell system further includes a first fastener and a second fastener, the first fastener being electrically connected to the positive electrode plate and the positive current collector, and the second fastener being electrically connected to the negative electrode plate and the negative current collector.

[0010] In some embodiments, the positive current collector includes:

[0011] The positive electrode body, one end of which is connected to the fuel cell stack body, and the other end extending in a direction close to the DC-DC converter; and

[0012] The positive output terminal is bent and connected to the end of the positive main body near the DC converter, and the positive output terminal is connected to the first fastener;

[0013] The negative current collector includes:

[0014] The negative electrode body, one end of which is connected to the fuel cell stack body, and the other end extending in a direction close to the DC-DC converter; and

[0015] The negative output terminal is bent and connected to the end of the negative part near the DC converter, and the negative output terminal is connected to the second fastener.

[0016] In some embodiments, the positive electrode plate includes:

[0017] A positive input terminal is provided, which corresponds to the positive output terminal. The positive input terminal is connected to the first fastener and is also connected to the positive output terminal through the first fastener.

[0018] The negative electrode plate includes:

[0019] The negative input terminal is configured to correspond to the negative output terminal. The negative input terminal is connected to the second fastener and is connected to the negative output terminal through the second fastener.

[0020] In some embodiments, the housing includes a first housing portion and a second housing portion, and the first housing portion and the second housing portion enclose a sealed cavity, wherein the first housing portion houses the fuel cell stack and is connected to the stack body, and the second housing portion houses the DC-DC converter and is connected to the converter body; the sealed cavity includes a first receiving space and a second receiving space that communicate with each other, the first housing portion includes the first receiving space, the first receiving space houses the stack body, and the second housing portion includes the second receiving space, the second receiving space houses the DC-DC converter.

[0021] In some embodiments, the second housing portion is provided with a cooling channel, and the fuel cell system further includes a water inlet and a water outlet, which are located at the top of the second housing portion and communicate with the cooling channel.

[0022] In some embodiments, the first housing portion is provided with a first connecting portion at one end near the second housing portion; the second housing portion is provided with a second connecting portion at one end near the first housing portion, and the second connecting portion is provided with a connecting groove facing the first connecting portion;

[0023] The fuel cell system also includes:

[0024] A third fastener, the third fastener passing through the first connecting portion and the second connecting portion; and

[0025] A sealing ring is disposed in the connecting groove, the sealing ring abuts against the inner surface of the connecting groove, and the sealing ring abuts against the surface of the first housing portion facing the second housing portion.

[0026] In some embodiments, the second housing portion is provided with a protective through hole, and the protective through hole is provided corresponding to at least one of the positive input terminal and the negative input terminal;

[0027] The fuel cell system also includes a protective cover located inside the protective through hole, and the protective cover is threadedly connected to the second housing portion.

[0028] In some embodiments, the second housing portion is provided with an explosion-proof through hole, which communicates with the second accommodating space;

[0029] The fuel cell system also includes:

[0030] An exhaust valve is provided inside the explosion-proof through hole and connected to the inner wall of the explosion-proof through hole, and the exhaust valve is connected to the second accommodating space.

[0031] Secondly, this application provides a vehicle, the vehicle comprising:

[0032] The vehicle body; and

[0033] A fuel cell system that supplies power to the vehicle body.

[0034] The vehicle provided in this application includes a vehicle body and a fuel cell system, wherein the fuel cell system can supply electrical energy to the vehicle body. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural schematic diagram of a fuel cell system according to an embodiment of this application;

[0037] Figure 2 This is another three-dimensional structural schematic diagram of a fuel cell system according to one embodiment of this application;

[0038] Figure 3 This is a three-dimensional structural schematic diagram of a fuel cell stack assembly according to an embodiment of this application;

[0039] Figure 4 This is a three-dimensional structural schematic diagram of a voltage conversion component according to an embodiment of this application;

[0040] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the fuel cell system along line AA.

[0041] Figure 6 yes Figure 1 The diagram shows another cross-sectional structure of the fuel cell system along line AA.

[0042] Figure 7 This is a three-dimensional structural schematic diagram of a fuel cell stack assembly according to another embodiment of this application;

[0043] Figure 8 yes Figure 5 A partially enlarged schematic diagram of part II of the fuel cell system shown;

[0044] Figure 9 yes Figure 5 A partially enlarged schematic diagram of section III of the fuel cell system shown;

[0045] Figure 10 This is a three-dimensional structural diagram of a fuel cell system in a separated state according to an embodiment of this application;

[0046] Figure 11 This is a three-dimensional structural diagram of the second housing portion according to an embodiment of this application;

[0047] Figure 12 yes Figure 6 A partially enlarged schematic diagram of section IV of the fuel cell system shown;

[0048] Figure 13 This is a three-dimensional structural diagram of the first housing portion according to an embodiment of this application;

[0049] Figure 14 yes Figure 2 A partially enlarged schematic diagram of part I of the fuel cell system shown;

[0050] Figure 15 This is a three-dimensional structural schematic diagram of a vehicle according to one embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] Vehicle 1, Fuel Cell System 10, Stack Assembly 11, Voltage Conversion Assembly 12, Sealing Ring 13, Protective Cover 14, Exhaust Valve 15, Fifth Connection Part 16, Vehicle Body 20, Sealed Cavity 10a, First Receiving Space 11a, Second Receiving Space 12a, First Fastener 101, Second Fastener 102, Third Fastener 103, Fourth Fastener 104, Fifth Fastener 105, Fuel Stack 111, First Housing Part 112, DC Converter 121, Second Housing Part 122, Cover Plate 123, Water Inlet 124, Water Outlet 125, Air Compressor Control Assembly 126, BOP Distribution Fuse 127, Relay 128, Discharge Resistor 129, Valve Connection Part 151, Stack Body 1110, Positive Current Collector 1111, Negative Current Collector 1112, Bottom Wall 1121, First Peripheral Side Wall 1122, Converter Body 1210, Positive Plate 1 211, negative plate 1212, inductor assembly 1213, power assembly 1214, top wall 1221, second peripheral side wall 1222, fourth connecting part 1110a, positive electrode body 1111a, positive electrode output terminal 1111b, positive electrode connecting part 1111c, negative electrode body 1112a, negative electrode output terminal 1112b, negative electrode connecting part 1112c, bottom plate 1121a, third connecting part 1121b, first connecting part 11 22a, positive input terminal 1211a, negative input terminal 1212a, protective through hole 1221a, connecting post 1221b, connecting plate 1221c, explosion-proof through hole 1222a, second connecting part 1222b, connecting groove 1222c, DC main output interface 1222d, air compressor controller output interface 1222e, BOP power distribution plug-in 1222f, low-voltage signal control plug-in 1222g, cooling flow channel 1223. Detailed Implementation

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0055] In this document, the reference to "embodiment" or "implementation" means that a specific feature, structure, or characteristic described in connection with or in connection with an implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0056] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 1 This is a three-dimensional structural schematic diagram of a fuel cell system according to an embodiment of this application; Figure 2 This is another three-dimensional structural schematic diagram of a fuel cell system according to one embodiment of this application;

[0057] Figure 3 This is a three-dimensional structural schematic diagram of a fuel cell stack assembly according to an embodiment of this application; Figure 4 This is a three-dimensional structural schematic diagram of a voltage conversion component according to an embodiment of this application; Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the fuel cell system along line AA. Figure 6 yes Figure 1 The diagram shows another cross-sectional view of the fuel cell system along line AA.

[0058] This application provides a fuel cell system 10, which includes a housing, a fuel cell stack 111, and a DC-DC converter 121. The housing encloses a sealed cavity 10a. The fuel cell stack 111 is disposed within the sealed cavity 10a, and the fuel cell stack 111 includes a stack body 1110, a positive current collector 1111, and a negative current collector 1112. The positive current collector 1111 and the negative current collector 1112 are respectively connected to the stack body 1110, and the stack body 1110 is fixedly connected to the housing. The DC-DC converter 121 is disposed in the sealed cavity 10a. The DC-DC converter 121 includes a converter body 1210, a positive plate 1211 and a negative plate 1212. The positive plate 1211 and the negative plate 1212 are respectively connected to the converter body 1210. The converter body 1210 is fixedly connected to the housing. The positive plate 1211 is electrically connected to the positive current collector 1111, and the negative plate 1212 is electrically connected to the negative current collector 1112.

[0059] The fuel cell system 10 of this application is a system that converts the chemical energy of fuel into electrical energy through a redox reaction. Due to its advantages such as high energy conversion efficiency, low harmful gas emissions, long service life, and energy saving and environmental protection, the fuel cell system 10 is widely used to provide power to new energy vehicles, buses, trains, airplanes, ships, submarines, portable power devices, stationary power stations, and stationary generators. The above are examples of application scenarios for the fuel cell system 10 provided in this application and should not be construed as limiting the application scenarios of the fuel cell system 10 provided in this application. The fuel cell system 10 of this application can be, but is not limited to, a phosphoric acid fuel cell system, a solid oxide fuel cell system, an alkaline fuel cell system, a proton exchange membrane fuel cell system, a lysozyme carbonate fuel cell system, etc. The above are examples of types of fuel cell systems 10 provided in this application and should not be construed as limiting the type of fuel cell system 10 provided in this application.

[0060] The fuel cell stack 111 converts the chemical energy of the fuel into electrical energy through a redox reaction, providing power to the fuel cell system 10. It is understood that the fuel cell stack 111 in this embodiment can be, but is not limited to, a phosphoric acid fuel cell stack, a solid oxide fuel cell stack, an alkaline fuel cell stack, a proton exchange membrane fuel cell stack, or a lysozyme carbonate fuel cell stack. The above are examples of types of fuel cell stack 111 provided in this application and should not be construed as limiting the type of fuel cell stack 111 provided in this embodiment.

[0061] The fuel cell stack 111 includes a stack body 1110, a positive current collector 1111, and a negative current collector 1112. The positive current collector 1111 and the negative current collector 1112 are respectively connected to the stack body 1110. It is understood that the positive current collector 1111 and the negative current collector 1112 are spaced apart. The positive current collector 1111 is connected to the positive plate 1211 of the DC-DC converter 121, and the negative current collector 1112 is connected to the negative plate 1212 of the DC-DC converter 121, thereby realizing current transfer between the DC-DC converter 121 and the fuel cell stack 111. The internal structure of the stack body 1110 can convert the chemical energy of the fuel into electrical energy through a redox reaction, providing power to the fuel cell system 10.

[0062] The DC-DC converter 121 may be, but is not limited to, a DC-DC voltage converter. The DC-DC voltage converter may be, but is not limited to, a high-voltage to high-voltage DC-DC voltage converter, a high-voltage to low-voltage DC-DC voltage converter, or a low-voltage regulated DC-DC voltage converter, etc. The above are examples of the types of DC-DC converter 121 provided in this application and should not be construed as limiting the type of DC-DC converter 121 provided in the embodiments of this application.

[0063] The DC-DC converter 121 includes a converter body 1210, a positive plate 1211, and a negative plate 1212, which are respectively connected to the converter body 1210. It is understood that the positive plate 1211 and the negative plate 1212 are spaced apart. The positive plate 1211 is connected to the positive current collector 1111 of the fuel cell stack 111, and the negative plate 1212 is connected to the negative current collector 1112 of the fuel cell stack 111, thereby enabling current transfer between the DC-DC converter 121 and the fuel cell stack 111. The DC-DC converter 121 can adjust the electrical energy from the fuel cell stack 111 to a voltage suitable for the load of the fuel cell system 10.

[0064] To clearly illustrate the beneficial effects of the technical solution of this application, related technologies are introduced here. In related technologies, the fuel cell stack and DC-DC converter of a fuel cell system are sealed in separate housings and then fixed, which is not conducive to the miniaturization design of the fuel cell system.

[0065] The fuel cell system 10 provided in this application embodiment has a sealed cavity 10a housing both the fuel cell stack 111 and the DC-DC converter 121, resulting in a more integrated fuel cell system 10 and reducing its size and weight. Furthermore, housing both the fuel cell stack 111 and the DC-DC converter 121 within a single housing allows for shorter current transmission distances between them, further enhancing current transmission speed, reducing current transmission losses, shortening the power response time of the fuel cell system 10, and increasing the reliability of the electrical connection between the fuel cell stack 111 and the DC-DC converter 121. This also reduces the cost of the electrical connection between the fuel cell stack 111 and the DC-DC converter 121 and further improves the integration of the fuel cell system 10.

[0066] Furthermore, the housing includes a first housing portion 112 and a second housing portion 122, and the first housing portion 112 and the second housing portion 122 enclose a sealed cavity 10a, wherein the first housing portion 112 houses the fuel stack 111 and is connected to the stack body 1110, and the second housing portion 122 houses the DC converter 121 and is connected to the converter body 1210.

[0067] The second housing portion 122 and the first housing portion 112 together define a sealed cavity 10a, which houses the fuel cell stack 111 and the DC-DC converter 121. The fuel cell system 10 provided in this application embodiment has a sealed cavity 10a housing both the fuel cell stack 111 and the DC-DC converter 121, resulting in a more integrated fuel cell system 10 and a reduced size and weight.

[0068] Furthermore, in the fuel cell system 10 provided in this application embodiment, the first housing portion 112 is fixedly connected to the stack body 1110 to form an independent stack assembly 11; the second housing portion 122 is fixedly connected to the converter body 1210 to form an independent voltage conversion assembly 12. When assembling the fuel cell system 10, the fuel stack 111 and the first housing portion 112 are fixedly connected first, and the DC-DC converter 121 and the second housing portion 122 are fixedly connected, and then the first housing portion 112 and the second housing portion 122 are connected. When maintaining the fuel cell system 10, the stack assembly 11 and the voltage conversion assembly 12 can be separated and disassembled first, and then the components can be disassembled and maintained. The independent stack assembly 11 and voltage conversion assembly 12 improve the efficiency of the assembly and maintenance of the fuel cell system 10.

[0069] Furthermore, the fuel cell system 10 also includes a first fastener 101 and a second fastener 102, wherein the first fastener 101 is electrically connected to the positive electrode plate 1211 and the positive current collector 1111, and the second fastener 102 is electrically connected to the negative electrode plate 1212 and the negative current collector 1112.

[0070] To clearly illustrate the beneficial effects of the technical solution of this application, related technologies are introduced here. In related technologies, the fuel cell stack and DC-DC converter of a fuel cell system are connected via connectors or copper busbars. However, connector connections have long wiring distances, poor stability, high cost, require cable fixing, and have slow long-distance transmission speeds, which are detrimental to energy saving and consumption reduction, and also hinder the miniaturization design of fuel cell systems. Direct copper busbar connections require insulation and support for the copper busbars, which is not conducive to the miniaturization design of the fuel cell stack; at the same time, the electrical connection between the copper busbar and the DC-DC converter involves significant stress, leading to poor reliability of current transmission and hindering the assembly between the fuel cell stack and the DC-DC converter.

[0071] The fuel cell system 10 provided in this application embodiment has a first fastener 101 electrically connecting the positive electrode plate 1211 and the positive current collector 1111, and a second fastener 102 electrically connecting the negative electrode plate 1212 and the negative current collector 1112, thereby realizing the electrical connection between the fuel cell stack 111 and the DC-DC converter 121. This results in a short current transmission distance between the fuel cell stack 111 and the DC-DC converter 121, further enabling faster current transmission speed, lower current transmission loss, shorter power response time of the fuel cell system 10, and stronger reliability of the electrical connection between the fuel cell stack 111 and the DC-DC converter 121. At the same time, it reduces the cost of the electrical connection between the fuel cell stack 111 and the DC-DC converter 121 and is more conducive to the integration of the fuel cell system 10.

[0072] Understandably, the positive electrode plate 1211 and the positive current collector 1111 have corresponding through holes. The first fastener 101 passes through the through holes, connecting the positive electrode plate 1211 and the positive current collector 1111, thereby achieving an electrical connection between the positive electrode plate 1211 and the positive current collector 1111. Similarly, the negative electrode plate 1212 and the negative current collector 1112 have corresponding through holes. The second fastener 102 passes through the through holes, connecting the negative electrode plate 1212 and the negative current collector 1112, thereby achieving an electrical connection between the negative electrode plate 1212 and the negative current collector 1112.

[0073] It is understood that the first fastener 101 and the second fastener 102 may be, but are not limited to, composed of screws, screws and nuts, or other components with fastening functions. It is also understood that the composition of the first fastener and the second fastener should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of the first fastener and the second fastener may be one or more. Optionally, the first fastener 101 is inserted sequentially through the positive electrode plate 1211 and the positive current collector plate 1111 towards the second housing portion 122 to achieve electrical connection between the positive electrode plate 1211 and the positive current collector plate 1111. Optionally, the second fastener 102 is inserted sequentially through the negative electrode plate 1212 and the negative current collector plate 1112 towards the second housing portion 122 to achieve electrical connection between the negative electrode plate 1212 and the negative current collector plate 1112.

[0074] In one possible embodiment, the converter body 1210 further includes an inductor assembly 1213, which is housed in the sealed cavity 10a and fixedly connected to the second housing portion 122. One end of the inductor assembly 1213 facing away from the second housing portion 122 is electrically connected to the positive electrode plate 1211. In one possible embodiment, the converter body 1210 includes six inductor assemblies 1213, which are electrically connected to the positive electrode plate 1211 via locking members. In one embodiment, the converter body 1210 further includes a power assembly 1214, which is housed in the sealed cavity 10a and fixedly connected to the second housing portion 122. The power assembly 1214 is electrically connected to the negative electrode plate 1212. In one possible embodiment, the power assembly 1214 is electrically connected to the positive electrode plate 1211 via locking members. The locking element may be, but is not limited to, a screw, or a screw and nut, or other components with a fastening function. It is understood that the composition of the locking element should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of locking elements may be one or more.

[0075] The fuel cell system 10 of this application embodiment may, but is not limited to, also include an air compressor control component 126, a BOP (Balance of Plant) fuse 127, a relay 128, and a discharge resistor 129. The air compressor control component 126, the BOP fuse 127, the relay 128, and the discharge resistor 129 are respectively housed in the sealed cavity 10a and are fixedly connected to the second housing portion 122.

[0076] The second housing portion 122 in this embodiment may, but is not limited to, also include a DC main output interface 1222d, an air compressor controller output interface 1222e, a BOP power distribution plug-in 1222f, and a low-voltage control plug-in 1222g. The DC main output interface 1222d is disposed on the second peripheral sidewall 1222 and electrically connected to the DC-DC converter 121; the air compressor controller output interface 1222e is disposed on the second peripheral sidewall 1222 and electrically connected to the air compressor control assembly 126; the BOP power distribution plug-in 1222f is disposed on the second peripheral sidewall 1222 and electrically connected to the BOP power distribution fuse 127. The low-voltage control plug-in 1222g, disposed on the second peripheral sidewall 1222, is used to control the low-voltage signals of the DC-DC converter 121 and the air compressor control assembly 126. In one possible implementation, the second housing portion 122 has two BOP power distribution plugs 1222f; one of the BOP power distribution plugs 1222f is used to electrically connect a thermistor (Positive Temperature Coefficient, PTC) to the BOP power distribution fuse 127, and the other interface is used to electrically connect a circulation pump to the BOP power distribution fuse 127 or to electrically connect a fan to the BOP power distribution fuse 127.

[0077] The fuel cell system 10 of this application embodiment may, but is not limited to, have a cooling channel 1223 in the second housing portion 122, which is disposed on the side of the second housing portion 122 away from the fuel cell stack assembly 11; the voltage conversion assembly 12 may, but is not limited to, also include a cover plate 123, which is connected to the side of the second housing portion 122 away from the fuel cell stack assembly 11 and together with the cooling channel 1223 defines a sealed cooling chamber; the cover plate 123 has an inlet and an outlet spaced apart, the inlet is used to allow cooling water to flow into the cooling chamber, and the outlet is used to allow the cooled water that has undergone heat exchange to flow to the outside of the second housing portion 122. In one possible implementation, the voltage conversion component 12 may, but is not limited to, include an inlet 124 and an outlet 125. The inlet 124 and the outlet 125 are disposed on the top of the second housing portion 122 and communicate with the cooling channel 1223. Specifically, the inlet 124 is connected to the cover plate 123 and is disposed corresponding to the inlet, for connecting an inlet pipe to allow cooling water to flow to the cooling chamber; the outlet 125 is connected to the cover plate 123 and is disposed corresponding to the outlet, for connecting an outlet pipe to allow the cooled water that has undergone heat exchange to flow to the outside of the second housing portion 122.

[0078] In summary, the fuel cell system 10 provided in this application includes a fuel cell stack assembly 11, a voltage conversion assembly 12, a first fastener 101, and a second fastener 102. The fuel cell stack 111 and the first housing portion 112 are connected to form the fuel cell stack assembly 11, and the DC-DC converter 121 and the second housing portion 122 are fixedly connected to form the voltage conversion assembly 12. This makes the fuel cell system 10 highly integrated and easy to assemble and maintain. The second housing portion 122 and the first housing portion 112 together define a sealed cavity 10a to house the fuel cell stack 111 and the DC-DC converter 121. The second housing portion 122 and the first housing portion 112 together defining a sealed cavity 10a achieves the housing and sealing of the fuel cell stack 111 and the DC-DC converter 121, thereby making the fuel cell system 10 more integrated, lighter, and easier to assemble and maintain. Furthermore, the first fastener 101 enables the electrical connection between the positive electrode plate 1211 and the positive current collector 1111, and the second fastener 102 enables the electrical connection between the negative electrode plate 1212 and the negative current collector 1112. Compared with traditional copper busbar direct connection or plug-in electrical connection, the fuel cell stack 111 and DC converter 121 of this application are electrically connected by the first fastener 101 and the second fastener 102, which makes the current transmission between the fuel cell stack 111 and the DC converter 121 more stable, reduces the weight of the fuel cell system 10, and reduces the installation complexity of the fuel cell system 10.

[0079] Please see Figure 6 and Figure 7 , Figure 7 This is a three-dimensional structural schematic diagram of a fuel cell stack assembly according to another embodiment of this application. In one embodiment, the positive current collector 1111 includes a positive electrode body 1111a and a positive electrode output terminal 1111b. One end of the positive electrode body 1111a is connected to the fuel cell stack body 1110, and the other end extends in a direction close to the DC-DC converter 121. The positive electrode output terminal 1111b is bent and connected to the end of the positive electrode body 1111a close to the DC-DC converter 121, and the positive electrode output terminal 1111b is connected to the first fastener 101. The negative current collector 1112 includes a negative electrode body 1112a and a negative electrode output terminal 1112b. One end of the negative electrode body 1112a is connected to the fuel cell stack body 1110, and the other end extends in a direction close to the DC-DC converter 121. The negative electrode output terminal 1112b is bent and connected to the end of the negative electrode body 1112a close to the DC-DC converter 121, and the negative electrode output terminal 1112b is connected to the second fastener 102.

[0080] Optionally, the positive current collector 1111 further includes a positive current connection portion 1111c, which is located on the side of the positive current body 1111a away from the positive current output terminal 1111b and is connected to the positive current body 1111a. The positive current connection portion 1111c is connected to the fuel cell stack body 1110. Optionally, the negative current collector 1112 further includes a negative current connection portion 1112c, which is located on the side of the negative current body 1112a away from the negative current output terminal 1112b and is connected to the positive current body 1111a. The negative current connection portion 1112c is connected to the fuel cell stack body 1110.

[0081] The positive output terminal 1111b is bent and connected to the positive electrode body 1111a at the end opposite to the fuel cell body 1110, and the negative output terminal 1112b is bent and connected to the negative electrode body 1112a at the end opposite to the fuel cell body 1110. In one possible embodiment, the positive output terminal 1111b is parallel or approximately parallel to the bottom wall 1121, and the negative output terminal 1112b is parallel or approximately parallel to the bottom wall 1121.

[0082] In summary, the fuel cell system 10 provided in this application includes a positive current collector 1111 comprising a positive electrode body 1111a and a positive electrode output terminal 1111b; and a negative current collector 1112 comprising a negative electrode body 1112a and a negative electrode output terminal 1112b. The positive electrode output terminal 1111b can be electrically connected to the positive electrode plate 1211, and the negative electrode output terminal 1112b can be electrically connected to the negative electrode plate 1212.

[0083] Please see Figure 4 and Figure 5 And please see Figure 8 and Figure 9 , Figure 8 yes Figure 5 A partially enlarged schematic diagram of part II of the fuel cell system shown; Figure 9 yes Figure 5 The diagram shows a partially enlarged view of part III of the fuel cell system. In one embodiment, the positive electrode plate 1211 includes a positive electrode input terminal 1211a, which is disposed corresponding to the positive electrode output terminal 1111b. The positive electrode input terminal 1211a is connected to the first fastener 101 and is also connected to the positive electrode output terminal 1111b through the first fastener 101. The negative electrode plate 1212 includes a negative electrode input terminal 1212a, which is disposed corresponding to the negative electrode output terminal 1112b. The negative electrode input terminal 1212a is connected to the second fastener 102 and is also connected to the negative electrode output terminal 1112b through the second fastener 102.

[0084] Furthermore, the positive input terminal 1211a is located on the side of the positive output terminal 1111b opposite to the first housing portion 112, and is attached to the positive output terminal 1111b. The first fastener 101 passes through the positive input terminal 1211a and the positive output terminal 1111b. The negative input terminal 1212a is located on the side of the negative output terminal 1112b opposite to the first housing portion 112, and is attached to the negative output terminal 1112b. The second fastener 102 passes through the negative input terminal 1212a and the negative output terminal 1112b.

[0085] It is understood that the first fastener 101 and the second fastener 102 may be, but are not limited to, composed of screws, screws and nuts, or other components with fastening functions. It is also understood that the composition of the first fastener 101 and the second fastener 102 should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of the first fastener 101 and the second fastener 102 may be one or more. In one possible embodiment, the positive electrode output terminal 1111b and the negative electrode output terminal 1112b have one or more through holes, the positive electrode input terminal 1211a has a through hole corresponding to the through hole of the positive electrode output terminal 1111b, and the negative electrode input terminal 1212a has a through hole corresponding to the through hole of the negative electrode output terminal 1112b. The first fastener 101 passes through the positive output terminal 1111b and the positive input terminal 1211a in sequence to achieve electrical connection between the positive plate 1211 and the positive current collector 1111; the second fastener 102 passes through the negative output terminal 1112b and the negative input terminal 1212a in sequence to achieve electrical connection between the negative plate 1212 and the negative current collector 1112.

[0086] In summary, the fuel cell system 10 provided in this application includes a positive electrode plate 1211 with a positive electrode input terminal 1211a and a negative electrode plate 1212 with a negative electrode input terminal 1212a. The positive electrode input terminal 1211a can be electrically connected to the positive electrode current collector 1111, and the negative electrode input terminal 1212a can be electrically connected to the negative electrode current collector 1112.

[0087] Please refer to Figures 1 to 9 In one embodiment, the sealed cavity 10a includes a first accommodating space 11a and a second accommodating space 12a that are connected. The first housing portion 112 includes the first accommodating space 11a, which accommodates the fuel cell stack body 1110. The second housing portion 122 includes the second accommodating space 12a, which accommodates the DC-DC converter 121.

[0088] Further, in one embodiment, the first housing portion 112 includes a bottom wall 1121 and a first peripheral side wall 1122. The bottom wall 1121 is fixedly connected to the fuel cell stack body 1110; the first peripheral side wall 1122 is bent and connected to the periphery of the bottom wall 1121, and the first peripheral side wall 1122 and the bottom wall 1121 together define a first receiving space 11a, the first receiving space 11a accommodating the fuel cell stack body 1110. The second housing portion 122 includes a top wall 1221 and a second peripheral side wall 1222. The top wall 1221 is fixedly connected to the converter body 1210; the second peripheral side wall 1222 is bent and connected to the periphery of the top wall 1221, and the second peripheral side wall 1222 and the top wall 1221 together define a second receiving space 12a, the second receiving space 12a accommodating the DC-DC converter 121.

[0089] In one optional embodiment, the bottom wall 1121 is a rectangular bottom wall, and the first peripheral side wall 1122 includes four rectangular side walls connected end to end; one end of each rectangular side wall is bent and connected to the edge of the bottom wall 1121, jointly defining the first accommodating space 11a, and the other end is sealed and connected to the second peripheral side wall 1222. The top wall 1221 is a rectangular top wall, the top wall 1221 is approximately parallel to the bottom wall 1121, and the size and shape of the projections of the top wall 1221 and the bottom wall 1121 on a plane parallel to the bottom wall 1121 are approximately the same. The second peripheral side wall 1222 includes four rectangular side walls connected end to end; one end of each rectangular side wall is bent and connected to the edge of the top wall 1221, jointly defining the second accommodating space 12a, and the other end is sealed and connected to the first peripheral side wall 1122.

[0090] The bottom wall 1121 is fixedly connected to the fuel cell stack body 1110, and the first accommodating space 11a accommodates the fuel cell stack body 1110, forming an independent fuel cell stack assembly 11. The top wall 1221 is fixedly connected to the converter body 1210, and the second accommodating space 12a accommodates the DC-DC converter 121, forming an independent voltage conversion assembly 12. Optionally, the side of the first peripheral sidewall 1122 facing away from the bottom wall 1121 is sealed to the side of the second peripheral sidewall 1222 facing away from the top wall 1221, so that the first accommodating space 11a and the second accommodating space 12a are interconnected to form the sealed cavity 10a, thereby further enhancing the integration of the fuel cell system 10 and reducing the size of the fuel cell system 10.

[0091] In summary, the fuel cell system 10 provided in this application includes a first housing portion 112 comprising a bottom wall 1121 and a first peripheral side wall 1122. The bottom wall 1121 securely connects the fuel cell stack body 1110 to the first housing portion 112; the first peripheral side wall 1122 is bent and connected to the periphery of the bottom wall 1121, and together with the bottom wall 1121, defines a first accommodating space 11a to accommodate the fuel cell stack body 1110. The second housing portion 122 comprises a top wall 1221 and a second peripheral side wall 1222. The top wall 1221 securely connects the second housing portion 122 to the converter body 1210, and the second peripheral side wall 1222 is bent and connected to the periphery of the top wall 1221, and together with the top wall 1221, defines a second accommodating space 12a to accommodate the DC-DC converter 121.

[0092] Please see Figure 6 , Figures 10 to 13 , Figure 10 This is a three-dimensional structural diagram of a fuel cell system in a separated state according to an embodiment of this application; Figure 11 This is a three-dimensional structural diagram of the second housing portion according to an embodiment of this application. Figure 12 yes Figure 5 A partially enlarged schematic diagram of section IV of the fuel cell system shown; Figure 13 This is a three-dimensional structural diagram of the first housing portion according to an embodiment of this application.

[0093] In one embodiment, the first housing portion 112 is provided with a first connecting portion 1122a at one end near the second housing portion 122; the second housing portion 122 is provided with a second connecting portion 1222b at one end near the first housing portion 112, and the second connecting portion 1222b is provided with a connecting groove 1222c facing the first connecting portion 1122a.

[0094] The fuel cell system 10 further includes a third fastener 103 and a sealing ring 13. The third fastener 103 passes through the first connecting portion 1122a and the second connecting portion 1222b. The sealing ring 13 is disposed in the connecting groove 1222c. The sealing ring 13 abuts against the inner surface of the connecting groove 1222c and abuts against the surface of the first housing portion 112 facing the second housing portion 122.

[0095] Further, in one embodiment, the first peripheral sidewall 1122 includes a first connecting portion 1122a, and the second peripheral sidewall 1222 includes a second connecting portion 1222b. The first connecting portion 1122a is disposed at one end of the first peripheral sidewall 1122 away from the bottom wall 1121; the second connecting portion 1222b is disposed at one end of the second peripheral sidewall 1222 away from the top wall 1221, and the second connecting portion 1222b has a connecting groove 1222c facing the first peripheral sidewall 1122. The fuel cell system 10 further includes a third fastener 103 and a sealing ring 13. The third fastener 103 passes through the first connecting portion 1122a and the second connecting portion 1222b; the sealing ring 13 is disposed in the connecting groove 1222c, the sealing ring 13 abuts against the inner surface of the connecting groove 1222c, and the sealing ring 13 abuts against the surface of the first housing portion 112 facing the second peripheral sidewall 1222.

[0096] In one possible implementation, the first connecting portion 1122a has one or more through holes located outside the sealing cavity 10a, and the second connecting portion 1222b has one or more through holes corresponding to the through holes of the first connecting portion 1122a. The third fastener 103 passes through the through holes of the first connecting portion 1122a and the second connecting portion 1222b, thereby connecting the first housing portion 112 and the second housing portion 122. It is understood that the third fastener 103 may be, but is not limited to, a screw, or a screw and nut, or other components with a fastening function. It is also understood that the composition of the third fastener 103 should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of third fasteners 103 may be one or more.

[0097] The sealing ring 13 can be, but is not limited to, a silicone ring sealing ring 13 or a rubber ring sealing ring 13. The sealing ring 13 is squeezed by the first connecting part 1122a and the second connecting part 1222b, thereby undergoing elastic deformation to fill the connecting groove 1222c, thereby achieving the sealing of the first housing part 112 and the second housing part 122, and further realizing that the first housing part 112 and the second housing part 122 define the sealing cavity 10a to accommodate the fuel stack 111 and the DC converter 121.

[0098] In summary, the fuel cell system 10 provided in this application includes a first connecting portion 1122a in the first peripheral sidewall 1122 and a second connecting portion 1222b in the second peripheral sidewall 1222. The fuel cell system 10 also includes a third fastener 103 and a sealing ring 13. The second connecting portion 1222b has a connecting groove 1222c, and the sealing ring 13 is disposed in the connecting groove 1222c. The third fastener 103 and the sealing ring 13 achieve a sealed connection between the first housing portion 112 and the second housing portion 122, thereby further enabling the first housing portion 112 and the second housing portion 122 to define the sealing cavity 10a.

[0099] Please see Figure 8 and Figure 9 And please see Figure 10 and Figure 11 In one embodiment, the second housing portion 122 is provided with a protective through hole 1221a, and the protective through hole 1221a is provided corresponding to at least one of the positive electrode input terminal 1211a and the negative electrode input terminal 1212a. The fuel cell system 10 also includes a protective cover 14, which is located inside the protective through hole 1221a, and the protective cover 14 is threadedly connected to the second housing portion 122.

[0100] Furthermore, in this embodiment, a protective through hole 1221a is provided on the top wall 1221 of the second housing portion 122.

[0101] Understandably, the top wall 1221 has the protective through hole 1221a, which is provided corresponding to at least one of the positive input terminal 1211a and the negative input terminal 1212a. The top wall 1221 corresponding to the protective through hole 1221a has an internal thread. The outer periphery of the protective cover 14 has an external thread, and the protective cover 14 and the top wall 1221 are threadedly connected by the internal thread and the external thread.

[0102] In one possible implementation, the top wall 1221 has four protective through holes 1221a, wherein two of the protective through holes 1221a are provided corresponding to the positive input terminal 1211a, and the other two protective through holes 1221a are provided corresponding to the negative input terminal 1212a. The fuel cell system 10 also includes four protective covers 14 corresponding to the protective through holes 1221a.

[0103] In summary, the fuel cell system 10 provided in this application embodiment further includes a protective through-hole 1221a on the top wall 1221, and a protective cover 14. The protective through-hole 1221a and the protective cover 14 enable the fuel cell system 10 to meet the IP67 protection rating, ensuring safe operation of the system. The protective through-hole 1221a is provided corresponding to at least one of the positive input terminal 1211a and the negative input terminal 1212a, so that when the protective cover 14 located within the protective through-hole 1221a loosens and falls off, it will land on either the positive input terminal 1211a or the negative input terminal 1212a, facilitating system maintenance.

[0104] Please see Figure 2 , Figure 10 and Figure 11 And please see Figure 14 , Figure 14 yes Figure 2 The diagram shows a partially enlarged view of part I of the fuel cell system. In one embodiment, the second housing portion 122 is provided with an explosion-proof through hole 1222a, which connects to the second accommodating space 12a. The fuel cell system 10 also includes an exhaust valve 15, which is disposed within the explosion-proof through hole 1222a and connected to the inner wall of the explosion-proof through hole 1222a, and the exhaust valve 15 connects to the second accommodating space 12a.

[0105] The exhaust valve 15 is used to expel gas from the sealed cavity 10a. Specifically, in this embodiment, the fuel cell system 10 further includes a fourth fastener 104. The exhaust valve 15 includes a valve connection portion 151. The fourth fastener 104 passes through the valve connection portion 151 and the second peripheral sidewall 1222, fixing the exhaust valve 15 to the second peripheral sidewall 1222. The explosion-proof through hole 1222a is provided corresponding to the exhaust valve 15.

[0106] In one possible implementation, the valve connection portion 151 has one or more through holes, and the second peripheral sidewall 1222 has a blind hole corresponding to the through hole of the valve connection portion 151. The fourth fastener 104 passes through the through hole of the valve connection portion 151 and extends into the blind hole of the second peripheral sidewall 122 from the side of the valve connection portion 151 away from the second housing portion 122, thereby realizing the connection between the valve and the second housing portion 122.

[0107] It is understood that the fourth fastener 104 may be, but is not limited to, a screw, or a screw and nut, or other components with a fastening function. It is also understood that the composition of the fourth fastener 104 should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of the fourth fastener 104 may be one or more. In one possible embodiment, the fuel cell system 10 includes four of the fourth fasteners 104, which are symmetrically arranged on the outer periphery of the explosion-proof through hole 1222a.

[0108] In summary, the fuel cell system 10 provided in this application further includes an exhaust valve 15 and a fourth fastener 104, and the second peripheral sidewall 1222 has an explosion-proof through hole 1222a. The exhaust valve 15 and the explosion-proof through hole 1222a enable the fuel cell system 10 to meet the IP67 protection level, ensuring the safe operation of the system. The fourth fastener 104 passes through the valve connection portion 151 and the second peripheral sidewall 1222 to achieve a fixed connection between the exhaust valve 15 and the second peripheral sidewall 1222.

[0109] It should be noted that in other embodiments, the exhaust valve 15 can be directly welded to the inner wall of the explosion-proof through hole 1222a or connected through other structures, and this application does not limit this.

[0110] Please see Figure 5 , Figure 10 and Figure 13 Further, in one embodiment, the bottom wall 1121 further includes a bottom plate 1121a and a third connecting portion 1121b, and the fuel cell stack assembly 11 further includes a fourth connecting portion 1110a. The bottom plate 1121a is bent and connected to the first peripheral sidewall 1122, and the bottom plate 1121a and the fuel cell stack body 1110 are spaced apart; the third connecting portion 1121b is received in the first receiving space 11a, the third connecting portion 1121b is connected to the bottom plate 1121a, and the third connecting portion 1121b is connected to the first peripheral sidewall 1122. The fourth connecting portion 1110a is connected to the fuel cell stack body 1110, and the fourth connecting portion 1110a is fixedly connected to the third connecting portion 1121b.

[0111] It is understood that the number of the third connecting portions 1121b can be one or more, and the number of the fourth connecting portions 1110a can be one or more. The third connecting portion 1121b is received in the first receiving space 11a, the third connecting portion 1121b is connected to the bottom plate 1121a, and the third connecting portion 1121b is connected to the first peripheral sidewall 1122. In one possible embodiment, the bottom plate 1121a is a rectangular plate, the first peripheral sidewall 1122 includes a plurality of side plates connected end to end, and the bottom wall 1121 includes four third connecting portions 1121b, respectively disposed at the four corners of the rectangular plate.

[0112] In one possible implementation, the third connecting portion 1121b has a blind hole opening towards the fuel cell stack body 1110, and the fourth connecting portion 1110a has a through hole corresponding to the third connecting portion 1121b. The third connecting portion 1121b and the fourth connecting portion 1110a are fixedly connected by fasteners. It is understood that the fasteners, extending from the side of the fourth connecting portion 1110a away from the base plate 1121a, pass through the through hole of the fourth connecting portion 1110a and extend into the blind hole of the third connecting portion 1121b to achieve a fixed connection between the fuel cell stack body 1110 and the first housing portion 112. It is understood that the fasteners can be, but are not limited to, screws, screws and nuts, or other components with a fastening function. It is understood that the composition of the fasteners should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of fasteners can be one or more.

[0113] In summary, the fuel cell system 10 provided in this application includes a bottom wall 1121 further comprising a bottom plate 1121a and a third connecting portion 1121b, and the fuel cell stack assembly 11 further comprising a fourth connecting portion 1110a. The third connecting portion 1121b and the fourth connecting portion 1110a achieve a fixed connection between the first housing portion 112 and the fuel cell stack body 1110, while further achieving an interval between the fuel cell stack body 1110 and the bottom plate 1121a, thereby ensuring the safe operation of the fuel cell stack assembly 11.

[0114] Please see Figure 4 , Figure 10 and Figure 11Furthermore, in one embodiment, the second housing portion 122 further includes a connecting post 1221b, and the fuel cell system 10 further includes a fifth fastener 105. One end of the connecting post 1221b is fixedly connected to the side of the top wall 1221 facing the DC-DC converter 121, and the other end is fixedly connected to the side of the DC-DC converter 121 facing the top wall 1221; the fifth fastener 105 passes through the converter body 1210 and the connecting post 1221b, connecting the DC-DC converter 121 and the second housing portion 122.

[0115] It is understood that the number of connecting posts 1221b can be one or more, and the length of the connecting posts 1221b is configured to match the shape of the DC-DC converter 121. It is understood that the fifth fastener 105 can be, but is not limited to, a screw, or a screw and nut, or other components with a fastening function. It is understood that the composition of the fifth fastener 105 should not be a limitation of the fuel cell system 10 provided in this embodiment. The number of the fifth fastener 105 can be one or more.

[0116] In one possible implementation, the connecting post 1221b has a blind hole facing the converter body 1210, and the converter body 1210 has a through hole corresponding to the connecting post 1221b. The fastener passes through the through hole of the converter body 1210 and extends into the blind hole of the connecting post 1221b from the side of the converter body 1210 away from the second housing portion 122, thereby realizing the fixed connection between the DC converter 121 and the second housing portion 122.

[0117] In one embodiment, the converter body 1210 further includes an inductor assembly 1213 and a power assembly 1214, which are respectively housed in the sealed cavity 10a and are fixedly connected to the second housing portion 122 via the connecting post 1221b and the fifth fastener 105. In another embodiment, the fuel cell system 10 further includes an air compressor control assembly 126 and a BOP (Balance of Power) fuse 127, which are respectively housed in the sealed cavity 10a and are fixedly connected to the second housing portion 122 via the connecting post 1221b and the fifth fastener 105.

[0118] In one embodiment, the second housing portion 122 further includes a connecting plate 1221c, which is connected to the top wall 1221. The number of connecting plates 1221c can be one or more. Optionally, the connecting plate 1221c is connected to the connecting post 1221b; alternatively, multiple connecting plates 1221c are connected end-to-end to form multiple receiving portions, and the first receiving space 11a includes these multiple receiving portions. In an optional embodiment, the multiple receiving portions respectively house, but are not limited to, the converter body 1210, the inductor assembly 1213, the air compressor control assembly 126, and the BOP power distribution fuse 127, etc.

[0119] In summary, the fuel cell system 10 provided in this application includes a connecting post 1221b in the second housing portion 122 and a fifth fastener 105. The connecting post 1221b and the fifth fastener 105 achieve a fixed connection between the top wall 1221 of the second housing portion 122 and the converter body 1210, and further achieve an interval between the converter body 1210 and the top wall 1221, thereby ensuring the safe operation of the tributary converter assembly.

[0120] Please see Figure 1 , Figure 10 and Figure 13 And please see Figure 15 , Figure 15This is a three-dimensional structural schematic diagram of a vehicle according to an embodiment of this application. An embodiment of this application provides a vehicle 1, which includes a vehicle body 20 and a fuel cell system 10, the fuel cell system 10 supplying power to the vehicle body 20. The fuel cell system 10 may include, but is not limited to, a fuel cell stack assembly 11, a voltage conversion assembly 12, a first fastener 101, and a second fastener 102. The fuel cell stack assembly 11 includes a fuel cell stack 111 and a first housing portion 112. The fuel cell stack 111 includes a stack body 1110, a positive current collector 1111, and a negative current collector 1112. The positive current collector 1111 and the negative current collector 1112 are respectively connected to the stack body 1110, and the first housing portion 112 is fixedly connected to the stack body 1110. The voltage conversion assembly 12 includes a DC-DC converter 121 and a second housing portion 122. The DC-DC converter 121 includes a converter body 1210, a positive plate 1211, and a negative plate 1212. The positive plate 1211 and the negative plate 1212 are respectively connected to the converter body 1210. The second housing portion 122 is fixedly connected to the converter body 1210, and the second housing portion 122 and the first housing portion 1212 together define a sealed cavity 10a. The sealed cavity 10a houses the fuel cell stack 111 and the DC-DC converter 121. A first fastener 101 is electrically connected to the positive plate 1211 and the positive current collector 1111; a second fastener 102 is electrically connected to the negative plate 1212 and the negative current collector 1112. Optionally, the first housing portion 112 of the fuel cell system 10 has a fifth connecting portion 16 on the side facing the vehicle body 20, the fifth connecting portion 16 being fixedly connected to the vehicle body 20.

[0121] In summary, the vehicle 1 provided in this application includes a vehicle body 20 and a fuel cell system 10, which can supply electrical energy to the vehicle body 20. Specifically, the fuel cell system 10 electrically connects the positive electrode plate 1211 and the positive current collector 1111 via a first fastener 101, and electrically connects the negative electrode plate 1212 and the negative current collector 1112 via a second fastener 102, thereby achieving electrical connection between the fuel cell stack 111 and the DC-DC converter 121. This results in a short power response time, low current transmission loss, fast current transmission speed, and high reliability of the electrical connection in the fuel cell system 10, thereby improving the energy efficiency and current transmission stability of the vehicle 1.

[0122] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an implementation can be included in at least one implementation of this application. The appearance of these phrases in various places in the specification does not necessarily refer to the same implementation, nor are they independent or alternative implementations mutually exclusive with other implementations. Those skilled in the art will understand, explicitly and implicitly, that the implementations described in this utility model can be combined with other implementations. Furthermore, it should be understood that the features, structures, or characteristics described in the various implementations of this application can be arbitrarily combined to form another implementation that does not depart from the spirit and scope of the technical solution of this utility model, provided there is no contradiction between them.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this application should not depart from the spirit and scope of the technical solution of this utility model.

Claims

1. A fuel cell system, characterized in that, The fuel cell system includes: A housing that encloses and forms a sealed cavity; A fuel cell stack is disposed within the sealed cavity. The fuel cell stack includes a stack body, a positive current collector plate, and a negative current collector plate. The positive current collector plate and the negative current collector plate are respectively connected to the stack body. The stack body and the housing are fixedly connected. A DC-DC converter is disposed within the sealed cavity. The DC-DC converter includes a converter body, a positive plate, and a negative plate. The positive plate and the negative plate are respectively connected to the converter body. The converter body and the housing are fixedly connected. The positive plate is electrically connected to the positive current collector, and the negative plate is electrically connected to the negative current collector.

2. The fuel cell system as described in claim 1, characterized in that, The fuel cell system further includes a first fastener and a second fastener, the first fastener being electrically connected to the positive electrode plate and the positive current collector, and the second fastener being electrically connected to the negative electrode plate and the negative current collector.

3. The fuel cell system as described in claim 2, characterized in that, The positive current collector includes: The positive electrode body, one end of which is connected to the fuel cell stack body, and the other end extending in a direction close to the DC-DC converter; and The positive output terminal is bent and connected to the end of the positive main body near the DC converter, and the positive output terminal is connected to the first fastener; The negative current collector includes: The negative electrode body, one end of which is connected to the fuel cell stack body, and the other end extending in a direction close to the DC-DC converter; and The negative output terminal is bent and connected to the end of the negative part near the DC converter, and the negative output terminal is connected to the second fastener.

4. The fuel cell system as described in claim 3, characterized in that, The positive electrode plate includes: A positive input terminal is provided, which corresponds to the positive output terminal. The positive input terminal is connected to the first fastener and is also connected to the positive output terminal through the first fastener. The negative electrode plate includes: The negative input terminal is configured to correspond to the negative output terminal. The negative input terminal is connected to the second fastener and is connected to the negative output terminal through the second fastener.

5. The fuel cell system as described in claim 4, characterized in that, The housing includes a first housing portion and a second housing portion, and the first housing portion and the second housing portion enclose a sealed cavity, wherein the first housing portion houses the fuel cell stack and is connected to the stack body, and the second housing portion houses the DC-DC converter and is connected to the converter body; the sealed cavity includes a first accommodating space and a second accommodating space that communicate with each other, the first housing portion includes the first accommodating space, the first accommodating space houses the stack body, and the second housing portion includes the second accommodating space, the second accommodating space houses the DC-DC converter.

6. The fuel cell system as described in claim 5, characterized in that, The second housing is provided with a cooling channel, and the fuel cell system also includes a water inlet and a water outlet, which are located at the top of the second housing and communicate with the cooling channel.

7. The fuel cell system as described in claim 5, characterized in that, The first housing portion has a first connecting portion at one end near the second housing portion; the second housing portion has a second connecting portion at one end near the first housing portion, and the second connecting portion has a connecting groove facing the first connecting portion. The fuel cell system also includes: A third fastener, the third fastener passing through the first connecting portion and the second connecting portion; and A sealing ring is disposed in the connecting groove, the sealing ring abuts against the inner surface of the connecting groove, and the sealing ring abuts against the surface of the first housing portion facing the second housing portion.

8. The fuel cell system as described in claim 5, characterized in that, The second housing portion is provided with a protective through hole, and the protective through hole is provided corresponding to at least one of the positive input terminal and the negative input terminal; The fuel cell system also includes a protective cover located inside the protective through hole, and the protective cover is threadedly connected to the second housing portion.

9. The fuel cell system as described in claim 5, characterized in that, The second housing portion is provided with an explosion-proof through hole, which connects to the second accommodating space; The fuel cell system also includes: An exhaust valve is provided inside the explosion-proof through hole and connected to the inner wall of the explosion-proof through hole, and the exhaust valve is connected to the second accommodating space.

10. A vehicle, characterized in that, The vehicles include: The vehicle body; and The fuel cell system according to any one of claims 1-9, wherein the fuel cell system supplies power to the vehicle body.

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