CN209843847U

CN209843847U - Fuel cell system

Info

Publication number: CN209843847U
Application number: CN201920857331.5U
Authority: CN
Inventors: 张永; 张威
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2019-12-24
Anticipated expiration: 2029-06-06

Abstract

The utility model provides a fuel cell system, include: a load circuit; a plurality of fuel cell stacks, each fuel cell stack comprising a plurality of single cells, each fuel cell stack being selectively accessible in a load circuit; the fuel cell system comprises a plurality of fuel cell stacks, a plurality of short-circuit bypasses, a plurality of load circuits and a plurality of control circuits, wherein the plurality of fuel cell stacks are connected with the plurality of short-circuit bypasses, and the plurality of fuel cell stacks are connected with the plurality of short-circuit bypasses. The utility model discloses a fuel cell system has solved the relatively poor problem of interference killing feature of the fuel cell system among the prior art.

Description

Fuel cell system

Technical Field

The utility model relates to a fuel cell technical field particularly, relates to a fuel cell system.

Background

Fuel cells are energy converters that convert the chemical energy of a "fuel gas" directly into direct current electrical energy. Under the condition that the current energy and environment conditions are gradually severe, hydrogen energy gradually attracts attention as a high-quality, high-efficiency and clean energy material. Meanwhile, fuel cells have attracted much research and industry efforts as one of the important forms of hydrogen energy utilization.

During the use of fuel cells, the stability and reliability of the fuel cells are affected by many factors, and can be roughly classified into three categories: structural factors, operational factors and external factors. Structural factors refer to deformation, failure and damage caused by the design structure, assembly precision, component reliability and the like of the fuel cell and the electric stack; the operating factors refer to the performance and service life reduction of the fuel cell caused by variable working conditions, improper operation or non-operation at the optimal working condition point and the like in the working process of the fuel cell. The external factors refer to a failure or performance failure of the fuel cell due to external environment, vibration, etc.

The power of a fuel cell for a passenger car or a commercial car is generally 30-120kW, is limited by the power output of the current single cell, and generally hundreds of single cells are required to be assembled to meet the required total power. For example, the Toyota MIRAI fuel cell vehicle has a total number of unit cells of 370 pieces and a total output of 114 kW. Considering the limitation of the total volume of the fuel cell stack in the application scenario, the volume (especially the thickness) of the single cell is necessarily as small as possible, which is why the metal bipolar plate fuel cell is more and more concerned. The thickness of the single-pole plate in the metal bipolar plate can reach 0.1-0.2mm, and the thickness of the assembled single battery is generally about 1-3 mm. The ultra-thin metal bipolar plate and the membrane electrode are arranged in the thin space, and the ultra-thin metal bipolar plate and the membrane electrode are required to work under the high current density of hundreds of amperes, so the reliability of the whole system faces very strict examination.

At present, a cell stack is generally adopted and assembled, and the cell stack is essentially a series structure of cells.

However, once a problem (such as a failure or performance degradation) occurs in a single cell, the performance of the whole cell stack is severely degraded or even fails.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a fuel cell system to solve the problem of poor anti-interference ability of the fuel cell system in the prior art.

In order to achieve the above object, the present invention provides a fuel cell system comprising: a load circuit; a plurality of fuel cell stacks, each fuel cell stack comprising a plurality of single cells, each fuel cell stack being selectively accessible in a load circuit; the fuel cell system comprises a plurality of fuel cell stacks, a plurality of short-circuit bypasses, a plurality of load circuits and a plurality of control circuits, wherein the plurality of fuel cell stacks are connected with the plurality of short-circuit bypasses, and the plurality of fuel cell stacks are connected with the plurality of short-circuit bypasses.

When the fuel cell system is in an initial working state, the first fuel cell stack is connected into the load circuit, and the second fuel cell stack is in a standby state; when the first fuel cell stack is in fault, the first fuel cell stack is cut off from the load circuit, and the second fuel cell stack is connected into the load circuit.

Further, the first fuel cell stacks are multiple, and the multiple first fuel cell stacks are all selectively connected into the load circuit.

Further, the load circuit further includes: a load assembly; the first fuel cell stacks are all arranged on the circuit main body; the first branch circuit is provided with a first connecting end and a second connecting end which are oppositely arranged, and the second connecting end is used for being connected with the load component; the second fuel cell stack is arranged on the second branch, the second branch is provided with a third connecting end and a fourth connecting end which are oppositely arranged, and the fourth connecting end is used for being connected with the load assembly; one end of the circuit main body is used for being connected with the load assembly, the other end of the circuit main body is provided with a first selection switch, and the first selection switch is selectively connected with the first connecting end of the first branch circuit or the third connecting end of the second branch circuit.

Further, the load circuit further includes: and the second selection switch is arranged on the second branch and is positioned between the second fuel cell stack and the load assembly.

Further, the load circuit includes: a first cable to which the circuit main body is connected; the first branch and the second branch are connected with the second cable; wherein, the one end of load subassembly is connected with first cable through first connecting cable, and the other end of load subassembly passes through second connecting cable and second cable junction.

Further, the load circuit includes: one end of the transformer is connected with the first cable through a first connecting cable, and the other end of the transformer is connected with the second cable through a second connecting cable; and a load unit connected to the transformer.

Further, the fuel cell system further includes: and the first gas supply assembly is used for being connected with each fuel cell stack so as to input hydrogen into each fuel cell stack.

Further, the first gas supply assembly further comprises: the first air supply branches are arranged in one-to-one correspondence with the fuel cell stacks, and each first air supply branch is used for being communicated with a first air inlet of the corresponding fuel cell stack; the first control valves are arranged in one-to-one correspondence with the first air supply branches, and each first control valve is arranged on the corresponding first air supply branch.

Further, the first gas supply assembly further comprises: the first gas supply main, the one end of keeping away from the fuel cell stack of each first gas supply branch road all communicates with first gas supply main, first gas supply main and hydrogen jar intercommunication to carry the hydrogen in the hydrogen jar for first gas supply branch road through first gas supply main.

Further, the fuel cell system further includes: and the second air supply assembly is used for being connected with each fuel cell stack so as to input air into each fuel cell stack.

Further, the second gas supply assembly further comprises: the plurality of second air supply branches are arranged in one-to-one correspondence with the plurality of fuel cell stacks, and each second air supply branch is used for being communicated with a second air inlet of the corresponding fuel cell stack; and the second control valves are arranged in one-to-one correspondence with the second air supply branches, and each second control valve is arranged on the corresponding second air supply branch.

Further, the fuel cell system further includes: and one end of the second air supply branch far away from the fuel cell stack is communicated with the second air supply main pipe, and the other end of the second air supply main pipe is communicated with the air compressor so as to convey air to the second air supply branch through the air compressor and the second air supply main pipe.

Further, the second gas supply assembly further comprises: the plurality of humidifiers are arranged in one-to-one correspondence with the plurality of second gas supply branches, and each humidifier is arranged on the corresponding second gas supply branch.

Further, the fuel cell system further includes: the fuel cell system comprises a plurality of fuel cell stacks, a plurality of recirculation assemblies, a plurality of control modules and a plurality of control modules, wherein the plurality of recirculation assemblies and the plurality of fuel cell stacks are arranged in a one-to-one correspondence manner, and each recirculation assembly is used for communicating a first air outlet and a first air inlet of the corresponding fuel cell stack; and the recirculation assembly comprises a recirculation pipe, one end of the recirculation pipe is communicated with the first gas outlet, and the other end of the recirculation pipe is communicated with the first gas inlet so as to convey hydrogen in the fuel cell stack from the first gas outlet to the first gas inlet.

Further, the fuel cell system further includes: and the control module is connected with each fuel cell stack to control whether each fuel cell stack is connected into the load circuit.

Further, the fuel cell system further includes: the monitoring module is connected with each fuel cell stack to monitor the power supply capacity of each fuel cell stack and send a processing command according to the power supply capacity of each fuel cell stack; the monitoring module is connected with the control module to send a processing command to the control module, so that the control module controls each fuel cell stack to be connected to or disconnected from the load circuit according to the processing command.

The fuel cell system of the utility model is provided with a plurality of fuel cell stacks, and each fuel cell stack can be selectively connected into the load circuit, so that a certain fuel cell stack can be cut off from the whole fuel cell system under the premise of not influencing the normal work of other fuel cell stacks when the performance of the fuel cell stack is degraded, and other fuel cell stacks which are not connected into the load circuit can be connected into the load circuit according to the requirement of the total output power of the fuel cell system; in addition, different numbers of fuel cell stacks can be selected to be connected into the load circuit according to the requirement of the total output power of the fuel cell system. The fuel cell system improves the stability of power output and the reliability of the system, is beneficial to optimizing the spatial layout in the application scene of the fuel cell, simplifies the maintenance process and reduces the maintenance cost.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of an embodiment of a fuel cell system according to the present invention;

fig. 2 shows a schematic diagram of a control process of a fuel cell system according to the present invention.

Wherein the figures include the following reference numerals:

10. a first fuel cell stack; 20. a second fuel cell stack; 31. a load assembly; 311. a transformer; 312. a load section; 32. a circuit main body; 321. a first selection switch; 33. a first branch; 34. a second branch circuit; 341. a second selection switch; 35. a short circuit bypass; 351. a bypass switch; 36. a first cable; 37. a second cable; 38. a first connection cable; 39. a second connection cable; 50. a first gas supply branch; 60. a first gas supply manifold; 70. a hydrogen tank; 80. a second gas supply branch; 90. a second gas supply manifold; 100. an air compressor; 110. a humidifier; 120. a monitoring module; 130. and a control module.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The utility model provides a fuel cell system, please refer to fig. 1 and fig. 2, include: a load circuit; a plurality of fuel cell stacks, each fuel cell stack comprising a plurality of single cells, each fuel cell stack being selectively accessible in a load circuit; the plurality of short-circuit bypasses 35 can be arranged on and off, the plurality of short-circuit bypasses 35 are arranged in one-to-one correspondence with the plurality of fuel cell stacks, and each short-circuit bypass 35 is connected with the corresponding fuel cell stack so that each fuel cell stack can be selectively connected into a load circuit.

In specific implementation, a plurality of fuel cell stacks are connected in series after being connected to a load circuit.

In order to open and close the short-circuit bypasses 35, a bypass switch 351 is disposed on each short-circuit bypass 35 to control the opening and closing of the short-circuit bypass 35. One end of each short-circuit bypass 35 is connected to the anode of the corresponding fuel cell stack, and the other end of the short-circuit bypass 35 is connected to the cathode of the fuel cell stack.

In the present embodiment, the plurality of fuel cell stacks includes a first fuel cell stack 10 and a second fuel cell stack 20, when the fuel cell system is in an initial operating state, the first fuel cell stack 10 is connected to a load circuit, and the second fuel cell stack 20 is in a standby state; when the first fuel cell stack 10 malfunctions, the first fuel cell stack 10 is disconnected from the load circuit, and the second fuel cell stack 20 is connected to the load circuit. Such an arrangement enables the second fuel cell stack 20 to be selectively turned on by a user or by the control module 130 when the first fuel cell stack 10 malfunctions or power fails, thereby ensuring stability of the total output power of the entire fuel cell system.

In the implementation, the number of the second fuel cell stacks 20 is multiple, so that the stability of the total output power of the whole fuel cell system is further ensured.

In the present embodiment, there are a plurality of first fuel cell stacks 10, and each of the plurality of first fuel cell stacks 10 is selectively connected to the load circuit. Thus, the stack with large overall power can be divided into a plurality of first fuel cell stacks 10, because the power of a single first fuel cell stack 10 is small, the stack can be designed in a compact and unitized manner, and in a layout structure with limited space, the spatial layout of the stack can be more convenient due to the structure of the plurality of first fuel cell stacks 10, and meanwhile, different numbers of first fuel cell stacks 10 can be selectively connected to a load circuit according to needs to provide different transmission powers.

In order to realize the selective access of the first fuel cell stack 10 and the second fuel cell stack 20 to the load circuit, the load circuit further includes: a load component 31; a circuit main body 32, the first fuel cell stacks 10 each being provided on the circuit main body 32; a first branch 33, wherein the first branch 33 has a first connection end and a second connection end which are oppositely arranged, and the second connection end is used for connecting with the load component 31; a second branch 34, on which the second fuel cell stack 20 is disposed, the second branch 34 having a third connection end and a fourth connection end which are oppositely disposed, the fourth connection end being used for connecting with the load assembly 31; one end of the circuit main body 32 is used for being connected with the load component 31, the other end of the circuit main body 32 is provided with a first selection switch 321, and the first selection switch 321 is selectively connected with the first connection end of the first branch 33 or the third connection end of the second branch 34.

In order to further ensure the switching reliability of the second branch circuit 34, the load circuit further includes a second selection switch 341, and the second selection switch 341 is disposed on the second branch circuit 34 and between the second fuel cell stack 20 and the load assembly 31. Such an arrangement improves the safety of the load circuit.

In the present embodiment, the load circuit includes: a first cable 36, to which the circuit body 32 is connected; a second cable 37 to which the first branch 33 and the second branch 34 are connected; one end of the load module 31 is connected to the first cable 36 via a first connection cable 38, and the other end of the load module 31 is connected to the second cable 37 via a second connection cable 39. This arrangement allows the electric currents of the plurality of fuel cell stacks to be converged by the first cable 36 and the second cable 37.

Preferably, the first cable 36 and the second cable 37 are collector buses.

In the present embodiment, the load circuit includes: a transformer 311, one end of the transformer 311 being connected to the first cable 36 via a first connection cable 38, and the other end of the transformer 311 being connected to the second cable 37 via a second connection cable 39; load unit 312, load unit 312 is connected to transformer 311. In such an arrangement, the voltage can be changed by the separation of the transformer 311 by electromagnetic induction, and the voltage can be converted and output to the load unit 312.

Preferably, the transformer 311 is a DC-DC converter, which is a device for converting electric energy of one voltage value into electric energy of another voltage value in a DC circuit.

In order to supply hydrogen to the fuel cell stacks, the fuel cell system further comprises a first gas supply assembly for connecting with each fuel cell stack to input hydrogen into each fuel cell stack.

When the concrete implementation, first air feed subassembly still includes: a plurality of first air supply branches 50, the plurality of first air supply branches 50 being disposed in one-to-one correspondence with the plurality of fuel cell stacks, each first air supply branch 50 being for communicating with a first air inlet of a corresponding fuel cell stack; and a plurality of first control valves provided in one-to-one correspondence with the plurality of first gas supply branches 50, each of the first control valves being provided on a corresponding first gas supply branch 50. Such an arrangement enables separate gas supply to each fuel cell stack.

In specific implementation, the first gas supply assembly further includes a first gas supply header 60, one end of each first gas supply branch 50, which is far away from the fuel cell stack, is communicated with the first gas supply header 60, and the first gas supply header 60 is communicated with the hydrogen tank 70, so that the hydrogen in the hydrogen tank 70 is delivered to the first gas supply branch 50 through the first gas supply header 60.

In order to supply oxygen to the fuel cell stacks, the fuel cell system further includes a second air supply assembly for connecting to each of the fuel cell stacks to supply air into each of the fuel cell stacks.

In specific implementation, the second gas supply assembly further comprises: a plurality of second air supply branches 80, the plurality of second air supply branches 80 being disposed in one-to-one correspondence with the plurality of fuel cell stacks, each second air supply branch 80 being for communicating with a second air inlet of a corresponding fuel cell stack; and a plurality of second control valves provided in one-to-one correspondence with the plurality of second gas supply branches 80, each of the second control valves being provided on a corresponding second gas supply branch 80. Such an arrangement enables separate gas supply to each fuel cell stack.

In specific implementation, the fuel cell system further includes a second air supply main 90, one end of the second air supply branch 80, which is far away from the fuel cell stack, is communicated with the second air supply main 90, and the other end of the second air supply main 90 is communicated with the air compressor 100, so as to deliver air to the second air supply branch 80 through the air compressor 100 and the second air supply main 90.

In this embodiment, the second gas supply assembly further includes a plurality of humidifiers 110, the plurality of humidifiers 110 are disposed in one-to-one correspondence with the plurality of second gas supply branches 80, and each humidifier 110 is disposed on a corresponding second gas supply branch 80. The arrangement can humidify the proton exchange membrane and avoid the large internal resistance of the proton exchange membrane.

In specific implementation, the second air supply assembly further comprises a plurality of second exhaust pipes, the plurality of second exhaust pipes are arranged in one-to-one correspondence with the plurality of fuel cell stacks, and each second exhaust pipe is communicated with the second air outlet of the corresponding fuel cell stack to exhaust redundant gas in the fuel cell stack, wherein the redundant gas is unreacted air and gas which does not react in the air.

In the present embodiment, the fuel cell system further includes: the fuel cell system comprises a plurality of fuel cell stacks, a plurality of recirculation assemblies, a plurality of control modules and a plurality of control modules, wherein the plurality of recirculation assemblies and the plurality of fuel cell stacks are arranged in a one-to-one correspondence manner, and each recirculation assembly is used for communicating a first air outlet and a first air inlet of the corresponding fuel cell stack; and the recirculation assembly comprises a recirculation pipe, one end of the recirculation pipe is communicated with the first gas outlet, and the other end of the recirculation pipe is communicated with the first gas inlet so as to convey hydrogen in the fuel cell stack from the first gas outlet to the first gas inlet. Such an arrangement facilitates efficient use of hydrogen.

In order to control the connection and disconnection of each fuel cell stack to and from the load circuit, as shown in fig. 2, the fuel cell system further includes a control module 130, and the control module 130 is connected to each fuel cell stack to control whether each fuel cell stack is connected to or disconnected from the load circuit.

In specific implementation, the control module 130 is in control connection with the first control valve, the second control valve, the humidifier 110, the bypass switch 351, the first selection switch 321, the second selection switch 341, the second exhaust pipe and the recirculation component, so that when the fuel cell stack is connected to a load circuit, the first control valve, the second control valve, the humidifier 110, the bypass switch 351, the second exhaust pipe and the recirculation component corresponding to the fuel cell stack are opened; and closing the first control valve, the second control valve, the humidifier 110, the bypass switch 351, the second exhaust pipe, and the recirculation assembly corresponding to the fuel cell stack when the fuel cell stack is disconnected from the load circuit; and controls the opening and closing of the first selection switch 321 and the second selection switch 341 when the second fuel cell stack 20 is connected to or disconnected from the load circuit.

In the present embodiment, the fuel cell system further includes a monitoring module 120, as shown in fig. 2, the monitoring module 120 is connected to each fuel cell stack to monitor the power supply capability of each fuel cell stack and send a processing command according to the power supply capability of each fuel cell stack; the monitoring module 120 is connected to the control module 130 to send a processing command to the control module 130, so that the control module 130 controls each fuel cell stack to be connected to or disconnected from the load circuit according to the processing command.

Wherein the power supply capability is output power or voltage. When the output power of one fuel cell stack is lower than the predetermined output power, the monitoring module 120 sends a processing command for shutting down the fuel cell stack to the control module 130, and if the output power of all fuel cell stacks connected to the load circuit after shutting down the fuel cell stack is smaller than the predetermined total output power of the fuel cell system, the monitoring module 120 sends a processing command for connecting the second fuel cell stack 20 to the load circuit to the control module 130; when the fuel cell system is in different operating conditions and the real-time total power demand is different, the monitoring module 120 issues a processing command to the control module 130 to adjust the number of the first fuel cell stacks 10 connected to the load circuit.

In this embodiment. Each fuel cell stack is a separate unit that can be removed from the power system by shorting via the shorting bypass 35 in the event of a fuel cell stack failure or performance degradation. After the failed fuel cell stack is removed, if the total output power does not meet the usage requirement, the backup second fuel cell stack 20 may be activated to use the backup second fuel cell stack 20 in series with the already operating fuel cell stack.

The utility model provides a proton exchange membrane fuel cell system resist to the sensitive problem of "broken external disturbance", improved power output's stability and system reliability, help optimizing the spatial layout in the fuel cell system application scene simultaneously, simplify the maintenance process, reduce the maintenance cost.

The utility model has the advantages that: a drop or failure in the performance of an individual cell is a destructive disturbance to the entire stack. Through the utility model discloses a fuel cell system can show the interference killing feature who strengthens whole battery power system. If a fuel cell stack fails or has degraded performance, it can be removed from the entire power system without affecting the normal operation of other fuel cell stacks, and can be timely incorporated into the second fuel cell stack 20 as needed. In fact, split fuel cell systems also facilitate the placement of fuel cells in confined spaces (e.g., in automotive settings).

The utility model discloses a fuel cell stack that contains a plurality of independently controlled miniwatt. The single split fuel cell stack can be designed in a compact and unitized manner due to low power. The control module 130 can control the air inlet process of each fuel cell stack and the connection between the air inlet process and the first cable 36 and the second cable 37, so that the independent switching-in or switching-out of the power system of each fuel cell stack is realized, the anti-interference capability of the power system of the fuel cell is improved, and the stability and the reliability of the output power of the system are improved. In a layout structure with limited space, the split system structure can also make the space layout of the galvanic pile more convenient. When a certain fuel cell stack fails or power is degraded, the standby second fuel cell stack 20 can be selectively turned on by a user, so as to ensure the stability of the total output power of the whole fuel cell system.

In a normal operation state of the fuel cell system, each fuel cell stack is diagnosed and monitored (output power or voltage can be monitored) by the monitoring module 120 in real time, when a fuel cell stack has a fault, a processing command is given (for example, the fault fuel cell stack is cut off or the performance declines below a set value), and then the fuel cell stack is manually cut off by a user according to actual conditions (air supply is cut off and the fault first fuel cell stack 10 is cut off, and the normal operation of other first fuel cell stacks 10 is not affected), at this moment. The second fuel cell stack 20, which is to be backed up, may be manually operated by a user if the total output power of the fuel cell system is difficult to continue.

The above process can also be automatically performed by the control module 130 by setting the corresponding control logic. In fact, it is also possible to dynamically start and shut down a certain first fuel cell stack 10 according to the power demand (e.g., during a variable power process of a vehicle during driving). If from the perspective that fuel cell power system maintained, system and structure in fact with the further unitization of galvanic pile system, only need change the fuel cell pile of performance decline or trouble in the maintenance, and do not dismantle and assemble other units, simplified the maintenance process, reduced the maintenance cost.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel cell system, characterized by comprising:

a load circuit;

a plurality of fuel cell stacks, each of said fuel cell stacks comprising a plurality of cells, each of said fuel cell stacks being selectively connectable into said load circuit;

the fuel cell system comprises a plurality of short-circuit bypasses (35), wherein each short-circuit bypass (35) can be arranged in an on-off mode, the short-circuit bypasses (35) are arranged in one-to-one correspondence to the fuel cell stacks, and each short-circuit bypass (35) is connected with the corresponding fuel cell stack so that each fuel cell stack can be selectively connected into the load circuit.

2. The fuel cell system according to claim 1, wherein the plurality of fuel cell stacks include a first fuel cell stack (10) and a second fuel cell stack (20), the first fuel cell stack (10) being switched into the load circuit when the fuel cell system is in an initial operation state, the second fuel cell stack (20) being in a standby state; when the first fuel cell stack (10) is in failure, the first fuel cell stack (10) is disconnected from the load circuit, and the second fuel cell stack (20) is connected into the load circuit.

3. The fuel cell system according to claim 2, wherein the first fuel cell stack (10) is plural, and the plural first fuel cell stacks (10) are each selectively connected to the load circuit.

4. The fuel cell system according to claim 2, wherein the load circuit further comprises:

a load assembly (31);

a circuit main body (32), the first fuel cell stacks (10) each being provided on the circuit main body (32);

a first branch (33), wherein the first branch (33) is provided with a first connecting end and a second connecting end which are oppositely arranged, and the second connecting end is used for being connected with the load assembly (31);

a second branch (34), wherein the second fuel cell stack (20) is arranged on the second branch (34), and the second branch (34) is provided with a third connecting end and a fourth connecting end which are oppositely arranged and used for connecting with the load assembly (31);

one end of the circuit main body (32) is used for being connected with the load component (31), the other end of the circuit main body (32) is provided with a first selection switch (321), and the first selection switch (321) is selectively connected with the first connecting end of the first branch circuit (33) or the third connecting end of the second branch circuit (34).

5. The fuel cell system according to claim 4, wherein the load circuit further comprises:

a second selection switch (341), the second selection switch (341) being disposed on the second branch (34) and between the second fuel cell stack (20) and the load assembly (31).

6. The fuel cell system according to claim 4, wherein the load circuit includes:

a first cable (36), the circuit body (32) being connected with the first cable (36);

a second cable (37), the first branch (33) and the second branch (34) both being connected with the second cable (37);

wherein one end of the load assembly (31) is connected with the first cable (36) through a first connecting cable (38), and the other end of the load assembly (31) is connected with the second cable (37) through a second connecting cable (39).

7. The fuel cell system according to claim 6, wherein the load circuit includes:

a transformer (311), one end of the transformer (311) being connected to the first cable (36) through the first connection cable (38), the other end of the transformer (311) being connected to the second cable (37) through the second connection cable (39);

a load unit (312), wherein the load unit (312) is connected to the transformer (311).

8. The fuel cell system according to claim 1, further comprising:

the first gas supply assembly is used for being connected with each fuel cell stack so as to input hydrogen into each fuel cell stack.

9. The fuel cell system of claim 8, wherein the first gas supply assembly further comprises:

the fuel cell system comprises a plurality of first air supply branches (50), a plurality of first air supply branches (50) and a plurality of fuel cell stacks, wherein the first air supply branches (50) are arranged in one-to-one correspondence with the fuel cell stacks, and each first air supply branch (50) is used for being communicated with a first air inlet of the corresponding fuel cell stack;

the first control valves are arranged in one-to-one correspondence with the first gas supply branches (50), and each first control valve is arranged on the corresponding first gas supply branch (50).

10. The fuel cell system of claim 9, wherein the first gas supply assembly further comprises:

first air supply main (60), each keeping away from of first air supply branch road (50) the one end of fuel cell stack all with first air supply main (60) intercommunication, first air supply main (60) and hydrogen tank (70) intercommunication, with pass through first air supply main (60) will hydrogen in the hydrogen tank (70) is carried for first air supply branch road (50).

11. The fuel cell system according to claim 1, further comprising:

and the second air supply assembly is used for being connected with each fuel cell stack so as to input air into each fuel cell stack.

12. The fuel cell system of claim 11, wherein the second gas supply assembly further comprises:

the plurality of second air supply branches (80) are arranged in one-to-one correspondence with the plurality of fuel cell stacks, and each second air supply branch (80) is used for being communicated with a second air inlet of the corresponding fuel cell stack;

and the second control valves are arranged on the second air supply branches (80) correspondingly one to one, and are arranged correspondingly.

13. The fuel cell system according to claim 12, further comprising:

second air supply house steward (90), keeping away from of second air supply branch road (80) the one end of fuel cell stack with second air supply house steward (90) intercommunication, the other end and the air compressor (100) intercommunication of second air supply house steward (90), in order to pass through air compressor (100) with second air supply house steward (90) to second air supply branch road (80) air delivery.

14. The fuel cell system of claim 12, wherein the second gas supply assembly further comprises:

the humidifier comprises a plurality of humidifiers (110), the humidifiers (110) and the second gas supply branches (80) are arranged in a one-to-one correspondence mode, and the humidifiers (110) are arranged on the corresponding second gas supply branches (80).

15. The fuel cell system according to claim 1, further comprising:

the fuel cell system comprises a plurality of fuel cell stacks, a plurality of recirculation assemblies, a plurality of gas inlets and a plurality of gas outlets, wherein the plurality of recirculation assemblies and the plurality of fuel cell stacks are arranged in a one-to-one correspondence manner, and each recirculation assembly is used for communicating the first gas outlet and the first gas inlet of the corresponding fuel cell stack;

wherein the recirculation assembly comprises a recirculation pipe, one end of the recirculation pipe is communicated with the first gas outlet, and the other end of the recirculation pipe is communicated with the first gas inlet, so that hydrogen in the fuel cell stack is conveyed from the first gas outlet to the first gas inlet.

16. The fuel cell system according to claim 1, further comprising:

a control module (130), wherein the control module (130) is connected with each fuel cell stack to control whether each fuel cell stack is connected into the load circuit.

17. The fuel cell system according to claim 16, further comprising:

the monitoring module (120) is connected with each fuel cell stack to monitor the power supply capacity of each fuel cell stack and send a processing command according to the power supply capacity of each fuel cell stack;

wherein the monitoring module (120) is connected with the control module (130) to send the processing command to the control module (130) so that the control module (130) controls each fuel cell stack to be connected to or disconnected from the load circuit according to the processing command.