Fuel cell system and vehicle

Abstract

The utility model provides a fuel cell system and a vehicle. The fuel cell system comprises an electric pile assembly, the electric pile assembly comprises a first electric pile main body and a second electric pile main body which are connected in parallel, the first electric pile main body is used for outputting a first voltage signal, and the second electric pile main body is used for outputting a second voltage signal; a DC-DC assembly; the electrode assembly comprises a first electrode, a second electrode and a third electrode, the first electrode is electrically connected to the positive electrode of the first electric pile main body and the positive electrode of the DC-DC assembly, and the second electrode is electrically connected to the positive electrode of the second electric pile main body and the positive electrode of the DC-DC assembly; the third electrode is electrically connected to the negative electrode of the first electric pile main body and the negative electrode of the second electric pile main body at the same time, and the electrode assembly is used for transmitting the first voltage signal and the second voltage signal to the DC-DC assembly, so that the assembly complexity is reduced, and the fuel cell system has the advantages of miniaturization and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell, in particular to a fuel cell system and a vehicle. BACKGROUND

[0002] As an important technical route for carbon reduction in transportation, fuel cells have already possessed large-scale commercial application conditions in the field of heavy-duty long-distance vehicles. In addition, high-power fuel cells are also needed in the fields of ships, rail transportation, distributed power generation, energy storage, etc.

[0003] At present, the technical route for realizing high power of hydrogen fuel cells includes adopting a system of double stacks or multiple stacks. However, when a wire harness is used to connect two separate stacks and one or more separate direct current-direct current (DC-DC) modules, the size of the entire fuel cell system will increase. CONTENT OF THE UTILITY MODEL

[0004] In view of this, the present application provides a fuel cell system, which reduces the assembly complexity and has the advantages of miniaturization and low cost.

[0005] In a first aspect, the present application provides a fuel cell system, which comprises:

[0006] a stack assembly, the stack assembly comprising a first stack body and a second stack body connected in parallel, wherein the first stack body is configured to output a first voltage signal, and the second stack body is configured to output a second voltage signal;

[0007] a DC-DC assembly; and

[0008] an electrode assembly, the electrode assembly comprising a first electrode, a second electrode and a third electrode, wherein the first electrode is electrically connected to a positive electrode of the first stack body and a positive electrode of the DC-DC assembly, the second electrode is electrically connected to a positive electrode of the second stack body and a positive electrode of the DC-DC assembly, one end of the third electrode is electrically connected to a negative electrode of the first stack body and a negative electrode of the second stack body, and the other end of the third electrode is electrically connected to a negative electrode of the DC-DC assembly, and the electrode assembly is configured to transmit the first voltage signal and the second voltage signal to the DC-DC assembly.

[0009] The DC-DC assembly receives the first voltage signal and the second voltage signal and outputs a third voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the first voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the second voltage signal.

[0010] The DC-DC assembly comprises a first voltage boosting module and a second voltage boosting module in parallel, the first voltage boosting module is electrically connected to the first electrode and receives the first voltage signal and boosts the first voltage signal, and the second voltage boosting module is electrically connected to the second electrode and receives the second voltage signal and boosts the second voltage signal.

[0011] The first voltage boosting module comprises a first positive busbar and a first negative busbar arranged in layers, the second voltage boosting module comprises a second positive busbar and a second negative busbar arranged in layers, the first electrode is electrically connected to the first positive busbar, the second electrode is electrically connected to the second positive busbar, and the third electrode is electrically connected to the first negative busbar and the second negative busbar at the same time.

[0012] The DC-DC assembly further comprises a heat sink, the heat sink is clamped between the first voltage boosting module and the second voltage boosting module and is used for heat dissipation of the first voltage boosting module and the second voltage boosting module.

[0013] The stack assembly further comprises a housing and a first sealing ring, the housing is used for accommodating the first stack body and the second stack body, the housing has a first opening, the electrode assembly passes through the first opening, and the first sealing ring is arranged around the periphery of the first opening.

[0014] The housing comprises a top wall and a side wall connected by bending, the top wall is provided with the first opening, the side wall is provided with a second opening, and the second opening is at least partially opposite to the electrode assembly.

[0015] The fuel cell system further comprises a cover plate and a second sealing ring, the cover plate covers the second opening, and the second sealing ring is arranged around the periphery of the second opening.

[0016] The fuel cell system further comprises a controller and a voltage collector, one end of the voltage collector is electrically connected to the electrode assembly, the voltage collector is used for collecting voltage values of the first voltage signal and the second voltage signal and obtaining a collection signal, the other end of the voltage collector is electrically connected to the controller and feeds back the collection signal to the controller, the controller receives the collection information and outputs a control signal, and the control signal is used for adjusting the power value of the stack assembly.

[0017] The DC-DC assembly further comprises a filter assembly, the filter assembly is electrically connected to the electrode assembly and is used for filtering alternating current signals of the first voltage signal and the second voltage signal.

[0018] In a second aspect, the application also provides a vehicle comprising the fuel cell system and an electric machine, the electric machine being electrically connected to the fuel cell system and configured to receive the third voltage signal. The fuel cell system provided by the application comprises a stack assembly, a DC-DC assembly and an electrode assembly. The stack assembly comprises a first stack body and a second stack body connected in parallel, the first stack body being configured to output a first voltage signal, and the second stack body being configured to output a second voltage signal. The electrode assembly comprises a first electrode, a second electrode and a third electrode. The first electrode is electrically connected to a positive electrode of the first stack body and a positive electrode of the DC-DC assembly. The second electrode is electrically connected to a positive electrode of the second stack body and a positive electrode of the DC-DC assembly. The third electrode is electrically connected to a negative electrode of the first stack body and a negative electrode of the second stack body. The negative electrode of the first stack body and the negative electrode of the second stack body are connected together, so that the connection interface between the stack assembly and the DC-DC assembly can be designed to be small and integrated, and the sealing reliability between the stack assembly and the DC-DC assembly is improved. The DC-DC assembly can accelerate the voltage boosting rate and output voltage signals meeting different working requirements, so that the fuel cell system is more widely applicable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 is a structural schematic diagram of the fuel cell system of the embodiment of the present application;

[0021] Figure 2 is Figure 1 is a three-dimensional exploded structural schematic diagram of the fuel cell system provided in the embodiment of the present application;

[0022] Figure 3 is Figure 2 is a local enlarged structural schematic diagram of the fuel cell system provided in the embodiment of the present application at a;

[0023] Figure 4 is a bottom view structural schematic diagram of the DC-DC assembly of the embodiment of the present application;

[0024] Figure 5 is a top view structural schematic diagram of the fuel cell system of the embodiment of the present application;

[0025] Figure 6 is Figure 5 a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0026] Figure 7 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0027] Figure 8 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0028] Figure 9 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0029] Figure 10 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0030] Figure 11 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0031] Figure 12 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0032] Figure 13 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0033] Figure 14 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0034] Figure 15 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0035] Figure 16 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0036] Figure 17 is a partial structure schematic view of a fuel cell system provided in the present application along the A-A line cross section;

[0037] BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 1-vehicle, 10-fuel cell system, 20-motor, 11-stack assembly, 12-DC-DC assembly, 13-electrode assembly, 15-cover plate, 16-second sealing ring, 17-controller, 18-voltage collector, 19-filter assembly, 111-first stack body, 112-second stack body, 113-housing, 114-first sealing ring, 121-first boost module, 122-second boost module, 123-radiator, 124-high-voltage distribution connector, 125-output connector, 126-signal connector, 127-first inductor assembly, 128-second inductor assembly, 131-first electrode, 132-second electrode, 133-third electrode, 181-current sensor, 182-positive electrode relay, 191-output relay, 192-common mode inductor, 193-high-voltage distribution circuit board, 194-control signal board, 1131-first opening, 1132-top wall, 1133-side wall, 1134-second opening, 1211-first positive electrode busbar, 1212-first negative electrode busbar, 1221-second positive electrode busbar, 1222-second negative electrode busbar, 1231-water nozzle, 1232-water channel, 1233-water channel cover plate. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In this document, reference to“an embodiment” or“the embodiments” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in the embodiments” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments, although they can be. It is explicitly recognized that the described embodiments are intended to be combined with one another in their mutual equivalents.

[0041] Before introducing the technical solutions of the present application, the technical problems in the related art will be described in detail.

[0042] Fuel cells are an important technical route for carbon reduction in transportation, and have already met the conditions for large-scale commercial application in the field of heavy-duty long-distance vehicles. In addition, large-power fuel cell stacks are also needed in the fields of ships, rail transportation, distributed power generation, and energy storage. At present, the main technical routes for high-power hydrogen fuel cells include double-stack or multi-stack systems, large current, multi-piece number of stacks, and full-power systems.

[0043] In the DC-DC converter in the hydrogen fuel cell of the high-power technical route, the input and output voltage ranges cannot have an overlapping area. In the small and medium-power hydrogen fuel cell, the number of fuel cell stack membrane electrode cell sheets is generally less than 500. With the increase of the power of the stack, the number of series cell sheets can reach 500-900, and the number of stack cell sheets for ships, rail transit, and distributed power generation can even be more. Since the voltage output by the fuel cell is proportional to the number of stack membrane electrode cell sheets, this leads to the need for a direct current-direct current (DC-DC) converter to work in the step-down mode under light load conditions and to work in the step-up mode under heavy load conditions, which also makes the DC-DC converter need to have step-up and step-down functions.

[0044] Because the step-up and step-down modules of the DC-DC converter need equal power, when the power of the fuel cell system is the same, the prior art needs a set of equal-power step-down module, the cost of the silicon carbide (SIC) power device in this part is extremely high, and the time and frequency of use of the step-down module in the fuel cell system are not as high as those of the step-up module, so this technology has certain disadvantages.

[0045] In addition, in a dual-stack fuel cell system, two separate stacks and one or more separate DC-DC modules are connected, and a wiring harness is needed to connect the stacks and the DC-DC modules, which increases the size of the entire fuel cell system, and a separate air compressor and hydrogen circulation pump are needed to supply hydrogen and oxygen to the separate stacks, which sharply increases the cost of the entire fuel cell system.

[0046] The existing fuel cell system mainly adopts two technical routes of single-stack and dual-stack. Among them, the single-stack has relatively small power, generally about 150 KW, and the output voltage of the single-stack is relatively low, so a DC-DC converter is needed to step up the voltage to meet the stable voltage output of the fuel cell system to the outside.

[0047] The dual-stack can improve the power by a large margin, with a power of more than 300 KW. The dual-stack is also designed in two technical routes, series connection and parallel connection.

[0048] First, regarding the series connection of the dual-stack, after the series connection of the dual-stack, the voltage will be doubled due to the series connection and pressure increase. However, due to the instability and wide range of the stack voltage, the output voltage may be higher than the voltage of the entire vehicle, so the DC-DC converter needs to have step-up and step-down functions.

[0049] However, the dual-stack series design also has some drawbacks. At the same power level, because the buck function requires a separate buck power module, and the buck power module's usage time and frequency are lower than the boost operation, it results in wasted buck circuitry (the buck module's power is approximately 60% of the boost power, leading to wasted power devices and increased difficulty in controlling the shift between boost and buck). Secondly, the dual-stack series design is difficult to implement and has low reliability.

[0050] Regarding the parallel design of dual fuel cell stacks, the power output can be doubled after the two stacks are connected in parallel. The stack voltage is a single voltage, meaning both stacks output the same voltage. The two stacks can also operate independently; when a single stack needs to output its power, a DC-DC converter can be used to boost the voltage. Therefore, dual fuel cell stacks require two outputs: two positive and two negative.

[0051] The parallel design of dual fuel cell stacks also offers the following advantages: Each stack can operate independently, with simultaneous startup and output power output being faster, and no step-down function is required, thus reducing the cost of the DC-DC converter. Secondly, the output power of the dual stacks can be controlled by two DC-DC converters, maintaining power balance between the two stacks. By sampling the power of each stack and controlling the oxygen and hydrogen feed rates, the electrical energy generated by each stack is balanced, thereby improving the stability of energy conversion between the DC-DC converter and the stacks. Furthermore, the two output modules of the DC-DC converter can be connected in series and combined, sharing a single control module to control both DC-DC modules, and the overall operating status of the DC-DC modules is fed back to the fuel cell system, improving the reliability of the entire fuel cell system output.

[0052] In view of this, to solve the above problems, this application provides a fuel cell system 10, which realizes the parallel design of dual stacks, the connection and control of dual DC-DC modules, and the combined output of the dual DC-DC modules, so that both the stack assembly 11 and the DC-DC assembly 12 have highly integrated connection, output, and control. Please refer to... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a schematic diagram of the structure of a fuel cell system according to an embodiment of this application. Figure 2 yes Figure 1 The exploded three-dimensional structure diagram of the fuel cell system provided in the diagram is as follows: Figure 3 yes Figure 2 The diagram provided shows a partially enlarged view of the fuel cell system at point a. Figure 4 A bottom view of the DC-DC component according to an embodiment of this application. Figure 5 This is a top view of the fuel cell system according to an embodiment of this application.Figure 6 is Figure 2 is a schematic diagram of a part of a fuel cell system provided in the present application along the cross section of A-A line, Figure 7 is a schematic diagram of a part of a fuel cell system provided in the present application. The fuel cell system 10 comprises a stack assembly 11, a DC-DC assembly 12 and an electrode assembly 13. The stack assembly 11 comprises a first stack body 111 and a second stack body 112 in parallel, the first stack body 111 is configured to output a first voltage signal, and the second stack body 112 is configured to output a second voltage signal. The electrode assembly 13 comprises a first electrode 131, a second electrode 132 and a third electrode 133. The first electrode 131 is electrically connected to the positive electrode of the first stack body 111 and the positive electrode of the DC-DC assembly 12. The second electrode 132 is electrically connected to the positive electrode of the second stack body 112 and the positive electrode of the DC-DC assembly 12. One end of the third electrode 133 is electrically connected to the negative electrode of the first stack body 111 and the negative electrode of the second stack body 112, and the other end of the third electrode 133 is electrically connected to the negative electrode of the DC-DC assembly 12. The electrode assembly 13 is configured to transmit the first voltage signal and the second voltage signal to the DC-DC assembly 12. The DC-DC assembly 12 receives the first voltage signal and the second voltage signal and outputs a third voltage signal, the voltage value of the third voltage signal is greater than the voltage value of the first voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the second voltage signal.

[0053] Optionally, the fuel cell system 10 comprises a double stack assembly 11, so that the fuel cell system 10 meets the application scenario of large power. Specifically, the stack assembly 11 comprises a first stack body 111 and a second stack body 112, the first stack body 111 is configured to output a first voltage signal, and the second stack body 112 is configured to output a second voltage signal. The first stack body 111 is in parallel with the second stack body 112, and the voltage value of the first voltage signal can be equal to the voltage value of the second voltage signal.

[0054] Optionally, the DC-DC assembly 12 is electrically connected to the stack assembly 11 through the electrode assembly 13 and receives the first voltage signal and the second voltage signal output by the stack assembly 11. The DC-DC assembly 12 can perform voltage boosting processing on the voltage signal output by the stack assembly 11, so that the fuel cell system 10 can meet the working demand of large power.

[0055] Optionally, the first electrode 131 is a copper bar or other conductor, the second electrode 132 is a copper bar or other conductor, and the third electrode 133 is a copper bar or other conductor. In this embodiment, the first electrode 131, the second electrode 132, and the third electrode 133 are all copper bars, so that the electrode assembly 13 occupies less space in the fuel cell system 10, thereby effectively improving the space utilization efficiency of the fuel cell system 10, compared with the use of a wire harness to connect the stack assembly 11 and the DC-DC assembly 12.

[0056] Optionally, one end of the first electrode 131 is electrically connected to the positive electrode of the first stack body 111, and the other end of the first electrode 131 is electrically connected to the positive electrode of the DC-DC assembly 12, and the first voltage signal is transmitted to the DC-DC assembly 12.

[0057] Optionally, one end of the second electrode 132 is electrically connected to the positive electrode of the second stack body 112, and the other end of the second electrode 132 is electrically connected to the positive electrode of the DC-DC assembly 12, and the second voltage signal is transmitted to the DC-DC assembly 12.

[0058] Optionally, the third electrode 133 is electrically connected to the negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 at the same time, i.e., the negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 are connected in a centralized manner, so that the connection interface between the stack assembly 11 and the DC-DC assembly 12 can have a miniaturized design, and the reliability of the sealing between the stack assembly 11 and the DC-DC assembly 12 is improved.

[0059] The DC-DC assembly 12 receives the first voltage signal and the second voltage signal and outputs a third voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the first voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the second voltage signal. Optionally, the DC-DC assembly 12 can simultaneously receive the first voltage signal and the second voltage signal, and the DC-DC assembly 12 can also separately receive the first voltage signal or the second voltage signal.

[0060] Specifically, when the fuel cell system 10 needs to output a large power signal, the first stack body 111 and the second stack body 112 can work simultaneously, the DC-DC assembly 12 receives and steps up the first voltage signal, the DC-DC assembly 12 receives and steps up the second voltage signal at the same time, and the DC-DC assembly 12 outputs a third voltage signal formed by connecting the stepped-up first voltage signal and the stepped-up second voltage signal in series, and the voltage value of the third voltage signal can meet the demand of large power, so that the DC-DC assembly 12 can realize the function of rapid stepping-up, and improve the working efficiency of the fuel cell system 10.

[0061] Specifically, when the fuel cell system 10 needs to output a non-large power signal, one of the first stack body 111 and the second stack body 112 can work, the DC-DC assembly 12 receives the first voltage signal or the second voltage signal, steps up and outputs a third voltage signal, and the voltage value of the third voltage signal can meet the demand of non-large power, so that compared with the traditional step-up / down DC-DC assembly 12, the DC-DC assembly 12 provided by the embodiment can not be provided with a step-down module, but only with a double step-up module, so that the voltage signal meeting different working demands can be output while the stepping-up rate is accelerated.

[0062] In summary, the fuel cell system 10 provided by the embodiment includes a stack assembly 11, a DC-DC assembly 12 and an electrode assembly 13. The stack assembly 11 includes a first stack body 111 and a second stack body 112 connected in parallel, the first stack body 111 is used to output a first voltage signal, and the second stack body 112 is used to output a second voltage signal. The electrode assembly 13 includes a first electrode 131, a second electrode 132 and a third electrode 133. The first electrode 131 is electrically connected to the positive electrode of the first stack body 111 and the positive electrode of the DC-DC assembly 12, the second electrode 132 is electrically connected to the positive electrode of the second stack body 112 and the positive electrode of the DC-DC assembly 12, and the third electrode 133 is electrically connected to the negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 at the same time. The negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 are connected in a centralized manner, so that the connection interface between the stack assembly 11 and the DC-DC assembly 12 can have a miniaturized and integrated design, and the sealing reliability between the stack assembly 11 and the DC-DC assembly 12 is improved. Moreover, the DC-DC assembly 12 can output voltage signals meeting different working demands while accelerating the stepping-up rate, so that the application scenarios of the fuel cell system 10 are more extensive.

[0063] Optionally, the anodes of the first stack body 111 and the second stack body 112 of the stack assembly 11 are connected in parallel, and are electrically connected to the DC-DC assembly 12 including two voltage-boosting modules.

[0064] Please refer to Figure 8 , Figure 9 and Figure 14 , Figure 8 is a partial structure diagram of a fuel cell system according to an embodiment of the present application, Figure 9 is a partial structure diagram of a DC-DC assembly according to an embodiment of the present application, Figure 14 is a partial structure diagram of a DC-DC assembly according to an embodiment of the present application. The DC-DC assembly 12 includes a first voltage-boosting module 121 and a second voltage-boosting module 122 connected in parallel. The first voltage-boosting module 121 is electrically connected to the first electrode 131 and receives the first voltage signal, and boosts the first voltage signal. The second voltage-boosting module 122 is electrically connected to the second electrode 132 and receives the second voltage signal, and boosts the second voltage signal.

[0065] Optionally, the first voltage-boosting module 121 is electrically connected to the first electrode 131 and receives the first voltage signal, and the first voltage-boosting module 121 is configured to boost the first voltage signal.

[0066] Optionally, the second voltage-boosting module 122 is electrically connected to the second electrode 132 and receives the second voltage signal, and the second voltage-boosting module 122 is configured to boost the second voltage signal.

[0067] In the embodiment, the first voltage-boosting module 121 is connected in parallel to the second voltage-boosting module 122, and the first voltage-boosting module 121 and the second voltage-boosting module 122 can work simultaneously, thereby improving the voltage-boosting efficiency of the DC-DC assembly 12, and further effectively improving the working efficiency of the fuel cell system 10.

[0068] Optionally, the DC-DC assembly 12 further includes a first inductor assembly 127 and a second inductor assembly 128. The first inductor assembly 127 is electrically connected to the first voltage-boosting module 121, and the second inductor assembly 128 is electrically connected to the second voltage-boosting module 122. That is, the DC-DC assembly 12 includes two inductor assemblies, and the two inductor assemblies can work simultaneously, thereby further improving the voltage-boosting efficiency of the DC-DC assembly 12.

[0069] Please refer to Figure 8and Figure 9 The first voltage boosting module 121 comprises a first positive busbar 1211 and a first negative busbar 1212 which are stacked, the second voltage boosting module 122 comprises a second positive busbar 1221 and a second negative busbar 1222 which are stacked, the first electrode 131 is electrically connected to the first positive busbar 1211, the second electrode 132 is electrically connected to the second positive busbar 1221, and the third electrode 133 is electrically connected to the first negative busbar 1212 and the second negative busbar 1222.

[0070] Optionally, the first voltage boosting module 121 comprises a first control module, a first positive busbar 1211, a first negative busbar 1212 and a first power module which are stacked in sequence. The first electrode 131 is electrically connected to the first positive busbar 1211, and the first voltage signal is transmitted to the first voltage boosting module 121 through the first positive busbar 1211.

[0071] Optionally, the second voltage boosting module 122 comprises a second control module, a second positive busbar 1221, a second negative busbar 1222 and a second power module which are stacked in sequence. The second electrode 132 is electrically connected to the second positive busbar 1221, and the second voltage signal is transmitted to the second voltage boosting module 122 through the second positive busbar 1221.

[0072] In the embodiment, the third electrode 133 is also electrically connected to the first negative busbar 1212 and the second negative busbar 1222, so that the negative electrodes of the first voltage boosting module 121 and the second voltage boosting module 122 are connected in a centralized manner, thereby improving the space utilization efficiency of the fuel cell system 10 and realizing the layout design of miniaturization of the fuel cell system 10.

[0073] Please refer to Figure 9 , Figure 10 , Figure 11 and Figure 15 , Figure 10 is a partial structure schematic diagram of a DC-DC assembly of Embodiment Two of the application, Figure 11 is a partial structure schematic diagram of a DC-DC assembly of Embodiment Three of the application, Figure 15 is a structure schematic diagram of a DC-DC assembly of the application. The DC-DC assembly 12 further comprises a heat sink 123 which is sandwiched between the first voltage boosting module 121 and the second voltage boosting module 122 and is used for dissipating heat of the first voltage boosting module 121 and the second voltage boosting module 122.

[0074] Optionally, the heat sink 123 is arranged between the first voltage boosting module 121 and the second voltage boosting module 122, one side of the heat sink 123 is arranged to be attached to the first power module of the first voltage boosting module 121, and the other side of the heat sink 123 is arranged to be attached to the second power module of the second voltage boosting module 122, so that the heat sink 123 can simultaneously achieve effective heat dissipation for the first voltage boosting module 121 and the second voltage boosting module 122, thereby improving the heat dissipation efficiency of the DC-DC assembly 12, and further achieving the integrated and small space layout of the DC-DC assembly 12.

[0075] Optionally, the heat sink 123 is further provided with a water channel 1232, the water channel 1232 is connected to the heat dissipation system inside the DC-DC assembly, and is connected to the heat dissipation system inside the fuel cell system 10 through a water nozzle 1231, so as to realize the circulation of the cooling medium in the heat sink 123. The heat sink 123 is further provided with a water channel cover plate 1233, which is used to seal the water channel 1232 to prevent leakage of the cooling medium.

[0076] Please refer to Figure 2 . The stack assembly 11 further comprises a housing 113 and a first sealing ring 114, the housing 113 is used to accommodate the first stack body 111 and the second stack body 112, the housing 113 has a first opening 1131, the electrode assembly 13 is arranged through the first opening 1131, and the first sealing ring 114 is arranged around the periphery of the first opening 1131.

[0077] Optionally, the material of the housing 113 includes but is not limited to metal, or alloy, or plastic, or plastic, or other composite materials, etc. It can be understood that the material of the housing 113 should not be limited to the stack assembly 11 provided by the present embodiment.

[0078] Optionally, the housing 113 is used to accommodate the first stack body 111 and the second stack body 112, thereby protecting the first stack body 111 and the second stack body 112.

[0079] Optionally, the housing 113 has a first opening 1131 adjacent to one side of the DC-DC assembly 12, the electrode assembly 13 is arranged through the first opening 1131, and the first stack body 111 and the second stack body 112 are electrically connected to the DC-DC assembly 12.

[0080] Optionally, the first sealing ring 114 is made of rubber, or plastic, or plastic, or other materials with insulating effect. It can be understood that the material of the first sealing ring 114 should not be limited to the fuel cell system 10 provided in the embodiment.

[0081] In the embodiment, the first sealing ring 114 is arranged around the first opening 1131, so that the DC-DC assembly 12 and the stack assembly 11 can be sealed and connected, to protect the internal components of the stack assembly 11 and the DC-DC assembly 12 from external impurities, and to prevent the electrode assembly 13 from external electromagnetic interference or from being affected by external electromagnetic interference, thereby improving the safety and reliability of the fuel cell system 10.

[0082] Please refer to Figure 12 , Figure 12 is a partial structure diagram of the fuel cell system of the second embodiment of the application. The shell 113 includes a top wall 1132 and a side wall 1133 connected by bending. The top wall 1132 is provided with the first opening 1131, and the side wall 1133 is provided with the second opening 1134, which is at least partially opposite to the electrode assembly 13.

[0083] Optionally, the bending angle of the side wall 1133 and the top wall 1132 can be 90° or approximately 90°.

[0084] Optionally, the shell 113 has the top wall 1132 adjacent to the DC-DC assembly 12. The top wall 1132 is provided with the first opening 1131 for the electrode assembly 13 to pass through.

[0085] In the embodiment, the side wall 1133 is also provided with the second opening 1134, and the second opening 1134 is at least partially opposite to the electrode assembly 13, so as to facilitate the installation and maintenance of the electrode assembly 13 through the second opening 1134, thereby reducing the disassembly of the DC-DC assembly 12 and the stack assembly 11, and making the maintenance process of the fuel cell system 10 more convenient.

[0086] Please refer to Figure 12 and Figure 13 , Figure 13 is a partial structure diagram of the fuel cell system of the third embodiment of the application. The fuel cell system 10 further includes a cover plate 15 and a second sealing ring 16. The cover plate 15 covers the second opening 1134, and the second sealing ring 16 is arranged around the second opening 1134.

[0087] Optionally, the material of the cover plate 15 includes but is not limited to metal, or alloy, or plastic, or plastic, or other composite materials, etc. It can be understood that the material of the cover plate 15 should not be limited to the fuel cell system 10 provided by the present embodiment.

[0088] Optionally, the material of the second sealing ring 16 is rubber, or plastic, or plastic, or other materials with insulation effect. It can be understood that the material of the second sealing ring 16 should not be limited to the fuel cell system 10 provided by the present embodiment.

[0089] In the present embodiment, the cover plate 15 covers the second opening 1134, thereby preventing the electrode assembly 13 from being interfered by or interfering with the external electromagnetic interference. The second sealing ring 16 surrounds the periphery of the second opening 1134, so that the cover plate 15 is more closely connected with the shell 113, so that the DC-DC assembly 12 and the stack assembly 11 can have a sealed environment, so that the components inside the DC-DC assembly 12 and the stack assembly 11 are not polluted by external impurities and eroded by water vapor, and the electrode assembly 13 can be further prevented from being interfered by or interfering with the external electromagnetic interference, thereby improving the safety and reliability of the fuel cell system 10.

[0090] Please refer to Figure 14 and Figure 16 , Figure 16 is a schematic diagram of the circuit connection of the fuel cell system of the present embodiment. The fuel cell system 10 further comprises a controller 17 and a voltage collector 18. One end of the voltage collector 18 is electrically connected to the electrode assembly 13. The voltage collector 18 is used to collect the voltage values of the first voltage signal and the second voltage signal and obtain a collection signal. The other end of the voltage collector 18 is electrically connected to the controller 17 and feeds back the collection signal to the controller 17. The controller 17 receives the collection information and outputs a control signal. The control signal is used to adjust the power value of the stack assembly 11.

[0091] Optionally, the voltage collector 18 can be electrically connected to the electrode assembly 13 to collect the voltage value of the first voltage signal and obtain a collection signal. The collection signal can be used to feedback the voltage value of the first voltage signal.

[0092] Optionally, the voltage collector 18 comprises a current sensor 181 and a positive relay 182. The power of a single stack is controlled according to the current sensor 181 and voltage collection calculation, so that the power of two stacks is kept balanced, the power deviation is prevented from being too large, and the safe and normal operation of the entire fuel cell system 10 can be controlled through the adjustment of the power parameter.

[0093] Optionally, the controller 17 can be arranged inside the fuel cell system 10 or outside the fuel cell system 10, which is not limited in the present application. The controller 17 is electrically connected to the voltage collector 18 and receives the collected information. The controller 17 judges whether the voltage value of the first voltage signal needs to be adjusted according to the voltage value of the first voltage signal fed back by the collected information. When the voltage value of the first voltage signal is greater than or less than a preset voltage value, the controller 17 outputs a control signal to the stack assembly 11, and the control signal is used to control and adjust the output power of the stack assembly 11.

[0094] Optionally, the voltage collector 18 can also collect the voltage value of the second voltage signal, and the controller 17 can also control and adjust the output power of the stack assembly 11 according to the voltage value of the second voltage signal collected by the voltage collector 18.

[0095] In the embodiment, the controller 17 balances the power of the first stack body 111 and the second stack body 112 through the power parameter, so as to prevent the power deviation of the first stack body 111 and the second stack body 112 from being too large, and further improve the reliability of the fuel cell system 10.

[0096] Please refer to Figure 8 and Figure 14 again. The DC-DC assembly 12 further comprises a filtering assembly 19 electrically connected to the electrode assembly 13 and used to filter the alternating current signals of the first voltage signal and the second voltage signal.

[0097] Optionally, the filtering assembly 19 can filter the first electrode 131, the second electrode 132 and the third electrode 133 of the electrode assembly 13 at the same time, and is used to filter the alternating current signals of the first voltage signal and the second voltage signal.

[0098] In the embodiment, the integrated design of the filtering assembly 19 of the first electrode 131, the second electrode 132 and the third electrode 133 can reduce the number of filtering assemblies 19, and is conducive to the centralized suppression of electromagnetic interference, so as to improve the integrated layout design of the fuel cell system 10, and effectively guarantee the safety performance of the fuel cell system 10.

[0099] Optionally, the DC-DC assembly 12 further comprises an output relay 191 and an output common mode inductor 192. The DC-DC assembly 12 further comprises a high-voltage power distribution circuit board 193 and a control signal board 194. The high-voltage power distribution circuit board (PCB) is provided with each power distribution fuse. The bottom of the high-voltage power distribution circuit board is provided with a discharge resistor and a heat sink for heat dissipation. The DC-DC assembly further comprises a control connector. The control connector and the control signal board 194 are placed in the shielding cavity of the DC-DC assembly 12, thereby ensuring safe operation.

[0100] Please refer to Figure 15 . The DC-DC assembly 12 further comprises a high-voltage power distribution connector 124, an output connector 125, and a signal connector 126. The high-voltage power distribution connector 124 is used to connect air compressors, hydrogen pumps, water pumps, PTC devices, and the like. The output connector 125 comprises a positive connector and a negative connector.

[0101] Please refer to Figure 17 , Figure 17 is a structural schematic diagram of a vehicle according to an embodiment of the present application. The present application further provides a vehicle 1 comprising a fuel cell system 10 and an electric machine 20, wherein the electric machine 20 is electrically connected to the fuel cell system 10 and is configured to receive the third voltage signal.

[0102] Optionally, the electric machine 20 and the fuel cell system 10 are arranged inside the vehicle 1. The electric machine 20 can be used to drive the vehicle 1 to move. The fuel cell system 10 is electrically connected to the electric machine 20 and transmits the third voltage signal to the electric machine 20, thereby providing power for the operation of the electric machine 20.

[0103] In the embodiment, the fuel cell system 10 comprises a stack assembly 11, a DC-DC assembly 12 and an electrode assembly 13, the stack assembly 11 comprises a first stack body 111 and a second stack body 112 in parallel, the first stack body 111 is used to output a first voltage signal, and the second stack body 112 is used to output a second voltage signal. The electrode assembly 13 comprises a first electrode 131, a second electrode 132 and a third electrode 133, the first electrode 131 is electrically connected to the positive electrode of the first stack body 111 and the positive electrode of the DC-DC assembly 12, the second electrode 132 is electrically connected to the positive electrode of the second stack body 112 and the positive electrode of the DC-DC assembly 12, and the third electrode 133 is electrically connected to the negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 at the same time. The negative electrode of the first stack body 111 and the negative electrode of the second stack body 112 are connected in a centralized manner, so that the connection interface between the stack assembly 11 and the DC-DC assembly 12 can have a miniaturized and integrated design, and the reliability of the seal between the stack assembly 11 and the DC-DC assembly 12 is improved. At the same time, the DC-DC assembly 12 can output voltage signals meeting different working requirements while accelerating the voltage increasing rate, so that the application scenarios of the fuel cell system 10 are more extensive, and the working efficiency of the vehicle 1 is effectively improved.

[0104] In the present application, the phrase "embodiment" or "embodiments" means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the embodiments of the present application can be combined with each other without contradiction, to form another embodiment without departing from the spirit and scope of the technical solution of the present application.

[0105] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A fuel cell system characterized by comprising: The fuel cell system comprises: a stack assembly comprising a first stack body and a second stack body in parallel, the first stack body being configured to output a first voltage signal, and the second stack body being configured to output a second voltage signal; a DC-DC assembly; and an electrode assembly comprising a first electrode, a second electrode, and a third electrode, the first electrode being electrically connected to a positive electrode of the first stack body and a positive electrode of the DC-DC assembly, the second electrode being electrically connected to a positive electrode of the second stack body and a positive electrode of the DC-DC assembly, one end of the third electrode being electrically connected to a negative electrode of the first stack body and a negative electrode of the second stack body, and the other end of the third electrode being electrically connected to a negative electrode of the DC-DC assembly, the electrode assembly being configured to transmit the first voltage signal and the second voltage signal to the DC-DC assembly; wherein the DC-DC assembly receives the first voltage signal and the second voltage signal and outputs a third voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the first voltage signal, and the voltage value of the third voltage signal is greater than the voltage value of the second voltage signal.

2. The fuel cell system of claim 1, wherein, The DC-DC assembly comprises a first boost module and a second boost module in parallel, the first boost module being electrically connected to the first electrode and receiving the first voltage signal and boosting the first voltage signal, and the second boost module being electrically connected to the second electrode and receiving the second voltage signal and boosting the second voltage signal.

3. The fuel cell system of claim 2, wherein The first boost module comprises a first positive busbar and a first negative busbar arranged in a stack, and the second boost module comprises a second positive busbar and a second negative busbar arranged in a stack, the first electrode being electrically connected to the first positive busbar, the second electrode being electrically connected to the second positive busbar, and the third electrode being electrically connected to the first negative busbar and the second negative busbar.

4. The fuel cell system of claim 2, wherein The DC-DC assembly further comprises a heat sink, the heat sink being arranged between the first boost module and the second boost module and being configured to dissipate heat from the first boost module and the second boost module.

5. The fuel cell system of claim 1, wherein, The stack assembly further comprises a housing and a first sealing ring, the housing being configured to accommodate the first stack body and the second stack body, the housing having a first opening, the electrode assembly being arranged through the first opening, and the first sealing ring being arranged around a periphery of the first opening.

6. The fuel cell system of claim 5, wherein, The housing comprises a top wall and a side wall connected by bending, the top wall being provided with the first opening, and the side wall being provided with a second opening, and the second opening being at least partially aligned with the electrode assembly.

7. The fuel cell system of claim 6, wherein The fuel cell system further comprises a cover plate and a second sealing ring, the cover plate being arranged on the second opening, and the second sealing ring being arranged around a periphery of the second opening.

8. The fuel cell system of claim 1, wherein, The fuel cell system further comprises a controller and a voltage collector, one end of the voltage collector is electrically connected to the electrode assembly, the voltage collector is used to collect voltage values of the first voltage signal and the second voltage signal and obtain a collection signal, the other end of the voltage collector is electrically connected to the controller and feeds back the collection signal to the controller, the controller receives the collection signal and outputs a control signal, the control signal is used to adjust the power value of the electrode assembly.

9. The fuel cell system of claim 1, wherein, The DC-DC assembly further comprises a filter assembly, the filter assembly is electrically connected to the electrode assembly and is used to filter alternating current signals of the first voltage signal and the second voltage signal.

10. A vehicle characterized by comprising: The vehicle comprises a motor and the fuel cell system according to any one of claims 1-9, the motor is electrically connected to the fuel cell system and is used to receive the third voltage signal.

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