A fuel cell system

Abstract

This application discloses a fuel cell system, including a fuel cell stack, a DC / DC converter, and a filter assembly. The filter assembly has a plug-in hole and a capacitor spring member at least partially disposed inside the plug-in hole. The output end of the fuel cell stack is inserted into the plug-in hole, causing the portion of the capacitor spring member inside the plug-in hole to deform and abut against the output end of the fuel cell stack and the inner wall of the plug-in hole, respectively. The input end of the DC / DC converter is electrically connected to the filter assembly. This application can filter the current transmitted from the fuel cell stack to the DC / DC converter, reduce the ripple of the current transmission, and improve the reliability and safety of the fuel cell system.

Description

Technical Field

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

[0002] As one of the important technological routes for carbon reduction in transportation, fuel cell systems have been widely used in the field of heavy-duty long-distance vehicle transportation. The fields of ships, rail transportation, distributed power generation and energy storage are also vigorously researching fuel cell systems. The current fuel cell stack has hundreds of cells connected in series, which can output high power to meet the needs of life and production. However, this also leads to an increase in output current. Under these circumstances, it is crucial to detect the input current in the fuel cell system and reduce the ripple of current transmission, so as to control the fuel cell system from the source. Utility Model Content

[0003] To address the aforementioned issues, this application proposes a fuel cell system that can reduce the ripple of the current transmitted between the fuel cell stack and the DC / DC converter, thereby improving the safety and reliability of the fuel cell system.

[0004] This application provides a fuel cell system, including a fuel cell stack, a DC / DC converter, and a filter assembly;

[0005] The filter component has a plug-in hole and a capacitive spring element that is at least partially disposed inside the plug-in hole;

[0006] The output end of the fuel cell stack is inserted into the insertion hole, causing the portion of the capacitor spring element inside the insertion hole to deform, thereby abutting against the output end of the fuel cell stack and the inner wall of the insertion hole respectively.

[0007] The input terminal of the DC / DC converter is electrically connected to the filter component.

[0008] In some embodiments, the capacitive elastic element has a bending portion and a plurality of gripping portions;

[0009] The gripping parts are spaced apart, and the end of each gripping part is bent, with the bending direction being consistent with the bending direction of the bending part.

[0010] In some embodiments, the bending portion has multiple perforations at the bending point.

[0011] In some embodiments, the gripping portions are evenly spaced and arranged in the same direction, and the arrangement direction of the perforated holes is the same as the arrangement direction of the gripping portions.

[0012] In some embodiments, the end of the bent portion is formed with at least two ends spaced apart, each end being connected to the root of at least two gripping portions simultaneously.

[0013] In some embodiments, the filtering component further includes a magnetic ring and a capacitor component;

[0014] The magnetic ring has the insertion hole;

[0015] The capacitor spring element and the capacitor component are electrically connected, and a portion of the capacitor spring element extends into the insertion hole.

[0016] The capacitor component is electrically connected to the DC / DC converter.

[0017] In some embodiments, the filtering component includes two of the capacitive spring elements;

[0018] Correspondingly, the magnetic ring includes two of the aforementioned insertion holes;

[0019] The output terminal of the fuel cell stack has a positive output terminal and a negative output terminal;

[0020] The positive output terminal is inserted into one of the plug holes, and one of the capacitor spring members abuts against the positive output terminal;

[0021] The negative output terminal is inserted into another of the aforementioned sockets, and another of the aforementioned capacitor springs abut against the negative output terminal.

[0022] In some embodiments, the output terminal of the fuel cell stack is electrically connected to a conductor, the conductor having multiple through-parts, each of which has a current sensor disposed on its outer periphery, and one end of the through-part extending out of the current sensor is electrically connected to the input terminal of the DC / DC converter.

[0023] In some embodiments, the fuel cell system further includes a conductive heat sink and a heat sink;

[0024] The conductive heat sink and the insertion part are electrically connected to one end of the current sensor.

[0025] The conductive heat sink has a first side and a second side that are disposed opposite to each other;

[0026] The first side of the conductive heat sink is connected to the heat sink via an insulating component, and the second side of the conductive heat sink is electrically connected to the input terminal of the DC / DC converter.

[0027] In some embodiments, a height difference is formed between one end of the interlocking portion that extends out of the current sensor and the input terminal of the DC / DC converter;

[0028] The second side of the conductive heat sink and one end of the insertion part that protrudes from the current sensor are electrically connected.

[0029] One end of the insertion part that extends out of the current sensor is electrically connected to the input terminal of the DC / DC converter via a conductive post.

[0030] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0031] The fuel cell system of this application includes a fuel cell stack, a DC / DC converter, and a filter assembly. The filter assembly has a plug-in hole and a capacitor spring member. At least a portion of the capacitor spring member, which can be compressed and deformed, is disposed inside the plug-in hole. The output end of the fuel cell stack is inserted into the plug-in hole, causing the portion of the capacitor spring member inside the plug-in hole to deform and abut against the output end of the fuel cell stack and the inner wall of the plug-in hole, respectively. Thus, the output end of the fuel cell stack and the filter assembly are firmly connected and can stably transmit current between them. The input end of the DC / DC converter is electrically connected to the filter assembly. The current transmitted from the output end of the fuel cell stack is first filtered by the filter assembly to reduce current ripple, and then the current flows to the DC / DC converter for voltage boosting so as to achieve a stable voltage output and output the voltage required by different devices.

[0032] Therefore, the fuel cell system of this application can filter the current supplied from the fuel cell stack to the DC / DC converter, which can improve the reliability and safety of the fuel cell system. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0034] Figure 1 This is a schematic diagram of the structure of a fuel cell system disclosed in an embodiment of this application;

[0035] Figure 2 for Figure 1 The diagram shows the electrical connection between the fuel cell stack and the DC-DC converter.

[0036] Figure 3 for Figure 1 The diagram shows a structural schematic of the fuel cell system from another perspective.

[0037] Figure 4 for Figure 1 The diagram shows the connection between the fuel cell stack and the DC / DC converter.

[0038] Figure 5 , Figure 6 for Figure 4The diagram shows the connection structure between the output terminal of the fuel cell stack and the input terminal of the DC / DC converter.

[0039] Figure 7 for Figure 6 A structural diagram from another perspective;

[0040] Figure 8 for Figure 7 The diagram shows the assembly relationship between the capacitor component and the capacitor spring.

[0041] The meanings of the reference numerals in the attached figures are as follows:

[0042] 1. Fuel cell stack; 11. Conductor; 111. Insertion section; 12. Output positive terminal; 13. Output negative terminal; 2. DC / DC converter; 21. Input positive terminal; 22. Input negative terminal; 3. Current sensor; 4. Conductive heat sink; 41. First side; 42. Second side; 43. Conductive post; 5. Heat sink; 6. Insulation component; 7. Filter component; 71. Magnetic ring; 711. Plug-in hole; 72. Capacitor spring component; 721. Bending section; 722. Grip section; 723. Hole; 73. Capacitor component; 8. Main housing; 81. Output interface; 82. Power distribution interface; 83. Signal control interface; 84. Air compressor controller output interface; 85. Water inlet; 86. Water outlet; 87. Maintenance window; 88. Assembly window. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] As one of the important technological routes for carbon reduction in transportation, fuel cell systems have been widely used in the field of heavy-duty long-distance vehicle transportation. The fields of ships, rail transportation, distributed power generation and energy storage are also vigorously researching fuel cell systems. The current fuel cell stacks contain hundreds of cells connected in series, ranging from 500 to 900 cells, which can output high power to meet the needs of life and production.

[0045] However, this leads to an increase in output current. In this case, it is crucial to detect the input current in the fuel cell system and reduce the ripple of current transmission. This can help control the fuel cell system from the source and improve its reliability and safety.

[0046] In this regard, such as Figures 1-8As shown, this application embodiment provides a fuel cell system including a fuel cell stack 1, a DC / DC converter 2, and a filter assembly 7. The filter assembly 7 has a plug-in hole 711 and a capacitor spring member 72 at least partially disposed inside the plug-in hole 711. The output end of the fuel cell stack 1 is inserted into the plug-in hole 711, causing the portion of the capacitor spring member 72 within the plug-in hole 711 to deform and abut against the output end of the fuel cell stack 1 and the inner wall of the plug-in hole 711, respectively. The input end of the DC / DC converter 2 is electrically connected to the filter assembly 7.

[0047] Based on the above technical solution, the output end of the fuel cell stack 1 can be inserted into the insertion hole 711, causing the portion of the capacitor spring member 72 within the insertion hole 711 to deform and abut against the output end of the fuel cell stack 1 and the inner wall of the insertion hole 711 respectively. Thus, the output end of the fuel cell stack 1 and the filter assembly 7 are firmly connected and can stably transmit current between them. The input end of the DC / DC converter 2 is electrically connected to the filter assembly 7. Here, the current transmitted from the output end of the fuel cell stack 1 is first filtered by the filter assembly 7 to reduce current ripple, and then the current flows to the DC / DC converter 2 for voltage boosting so that a stable voltage output can be achieved, and the voltage required by different devices can be output.

[0048] The filter assembly 7 also includes a magnetic ring 71 and a capacitor component 73. The magnetic ring 71 has a plug hole 711. The capacitor spring member 72 and the capacitor component 73 are electrically connected, and a portion of the capacitor spring member 72 extends into the plug hole 711. The capacitor component 73 is electrically connected to the DC / DC converter 2.

[0049] The output terminal of the fuel cell stack 1 has a positive output terminal 12 and a negative output terminal 13. Correspondingly, the filter assembly 7 includes two capacitor spring members 72, and the magnetic ring 71 includes two insertion holes 711. The positive output terminal 12 is inserted into one of the insertion holes 711, and one of the capacitor spring members 72 abuts against the positive output terminal 12, causing the elastic deformation portion of the capacitor spring member 72 in this insertion hole 711 to undergo elastic deformation. The negative output terminal 13 is inserted into the other insertion hole 711, and the other capacitor spring member 72 abuts against the negative output terminal 13, causing the elastic deformation portion of the capacitor spring member 72 in this insertion hole 711 to undergo elastic deformation.

[0050] Therefore, the positive output terminal 12 of the fuel cell stack 1, one of the capacitor spring elements 72, the magnetic ring 71, the capacitor element 73, and the positive input terminal 21 of the DC / DC converter 2 are electrically connected, and the negative output terminal 13 of the fuel cell stack 1, another capacitor spring element 72, the magnetic ring 71, the capacitor element 73, and the negative input terminal 22 of the DC / DC converter 2 are electrically connected. In this way, the current supplied from the fuel cell stack 1 to the DC / DC converter 2 is filtered.

[0051] The fuel cell system of this application also includes a main housing 8, a DC / DC converter 2 disposed inside the main housing 8, an opening at the bottom of the main housing 8, a filter assembly 7 disposed inside the main housing 8, and a plug-in hole 711 corresponding to the opening. Both plug-in holes 711 are provided corresponding to the opening. The capacitor spring member 72 is connected to the wall of the main housing 8 at the opening to limit and insulate the capacitor spring member 72, so as to prevent the current of the fuel cell stack 1 from flowing to the main housing 8, so as to avoid accidents.

[0052] The fuel cell system stack 1 and DC / DC converter 2 can be assembled as follows: the main housing 8 containing the DC / DC converter 2 and the housing of the stack 1 are assembled by assembling them from top to bottom. After assembly, power is drawn from the capacitor spring element 72 by pressing the positive and negative copper busbars at the output end of the stack 1.

[0053] The magnetic ring 71 is locked and fixed inside the main housing 8. The connection between the magnetic ring 71 and the main housing 8 is insulated, and an insulating gasket can also be provided at the connection.

[0054] Generally, the fuel cell stack 1 is located at the bottom, and the DC / DC converter 2 is located at the top.

[0055] In order to adapt to the shape of the insertion hole 711 of the magnetic ring 71, the capacitor spring member 72 is set to be curved and has a strong deformation capability. When deformed, it can abut against the copper busbar at the output end of the fuel cell stack 1, so that the copper busbar at the output end of the fuel cell stack 1 is tightly connected to the inner wall of the insertion hole 711. At the same time, the capacitor spring member 72 will not undergo irreversible deformation when the fuel cell stack 1 and the DC / DC converter 2 are assembled and disassembled multiple times.

[0056] The magnetic ring 71 has a hole inside when it leaves the factory, which can be directly used to insert the copper busbar at the output end of the fuel cell stack 1 into the fuel cell system without the need for additional machining of the hole. The outer shell of the magnetic ring 71 has an insulating function, and its outer periphery can be connected to the wall at the opening of the main housing 8. When the fuel cell stack 1 and DC / DC converter 2 are disassembled and reassembled multiple times, and the copper busbar at the output end of the fuel cell stack 1 is inserted and removed multiple times inside the magnetic ring 71, the position of the magnetic ring 71 will not shift. In this way, the filter component 7 is stably set inside the main housing 8.

[0057] In some embodiments, the capacitor spring member 72 has a bending portion 721 and a plurality of gripping portions 722. The gripping portions 722 are spaced apart, and the end of each gripping portion 722 is bent, and the bending direction is consistent with the bending direction of the bending portion 721. Thus, the capacitor spring member 72 adopts a two-bend, multi-grip structure, which increases the electrical contact area with the copper busbars of the positive and negative terminals of the output end of the capacitor stack 1. The two bends can better absorb the displacement of the copper busbar assembly and better connect with the copper busbars of the positive and negative terminals of the output end of the capacitor stack 1. The multiple gripping portions 722 can provide reliable electrical connection and draw power from the copper busbars of the positive and negative terminals of the output end of the capacitor stack 1 at multiple points. Each gripping portion 722, the copper busbars of the output end of the capacitor stack 1, and the magnetic ring 71 form a filter circuit. Each filter circuit is connected to a main path, which does not affect the filtering efficiency.

[0058] Furthermore, the gripping parts 722 are spaced apart, meaning there is a gap between two adjacent gripping parts 722. Due to the presence of the gripping parts 722, there is also a gap between the inner wall of the insertion hole 711 of the filter component 7 and the copper busbar at the output end of the fuel cell stack 1. The heat generated during filtering can be conducted to the outside through these gaps, preventing the output end of the fuel cell stack 1, the filter component 7, and the input end of the DC / DC converter 2 from overheating, which could affect filtering or even cause safety issues.

[0059] Multiple perforated holes 723 are provided at the bending position on the bending part 721. The perforated holes 723 can accelerate the heat dissipation of the capacitor elastic component 72. The gripping parts 722 are evenly spaced and arranged in the same direction. The arrangement direction of the perforated holes 723 is the same as the arrangement direction of the gripping parts 722. The end of the bending part 721 has at least two end portions that are spaced apart. Each end portion is connected to the root of at least two gripping parts 722. This arrangement can increase the deformation capability of the capacitor elastic component 72. After multiple assembly or disassembly of the fuel cell stack 1 and the DC / DC converter 2, the capacitor elastic component 72 can still return to its original shape and continue to be used.

[0060] The output end of the fuel cell stack 1 is electrically connected to a conductor 11. The conductor 11 has multiple insertion parts 111. Each insertion part 111 is provided with a current sensor 3 on its outer periphery. One end of the insertion part 111 that extends out of the current sensor 3 is electrically connected to the input end of the DC / DC converter 2.

[0061] Multiple branches are connected in parallel between the output terminal of the fuel cell stack 1 and the input terminal of the DC / DC converter 2. These branches can shunt the current conducted between the fuel cell stack 1 and the DC / DC converter 2. The current flowing through each branch is small, so it will not cause the conductor 11 connecting the fuel cell stack 1 and the DC / DC converter 2 to overheat. In addition, each branch is equipped with a current sensor 3, which can accurately detect the magnitude of the current.

[0062] Therefore, this application improves the connection method between the fuel cell stack 1 and the DC / DC converter 2 in a high-power fuel cell system, reduces the heat generation of the conductor 11 in the branch circuit, enables accurate measurement of the current output from the fuel cell stack 1 to the DC / DC converter 2, and achieves source control of the fuel cell system, thereby improving the reliability and safety of the system.

[0063] It should be noted that the current sensor 3 currently used for measuring the current between the fuel cell stack 1 and the DC / DC converter 2 has a small window size. This limits the conductive cross-sectional area of ​​the conductor 11 used to conduct current between the fuel cell stack 1 and the DC / DC converter 2. The conductor 11 has high resistance and a large voltage drop, resulting in excessive current flowing through the conductor 11. The conductor 11 heats up severely, which can easily cause the Hall element in the current sensor 3 to fail, rendering the current detection function of the current sensor 3 ineffective and ultimately affecting the measurement accuracy of the current sensor 3. This application sets up multiple branches between the fuel cell stack 1 and the DC / DC converter 2, which allows the use of the aforementioned current sensor 3 without increasing its window size, while ensuring that the conductor 11 used to conduct current between the fuel cell stack 1 and the DC / DC converter 2 does not heat up severely, achieving accurate measurement of the current magnitude and improving the reliability and safety of the fuel cell system.

[0064] Specifically, in practical applications, the number of current sensors 3 between the fuel cell stack 1 and the DC / DC converter 2 can be set as needed.

[0065] In some embodiments, two current sensors 3 may be connected in parallel to the output terminal of the fuel cell stack 1, and these two current sensors 3 are respectively electrically connected to the input terminal of the DC / DC converter 2.

[0066] In other embodiments, three or more current sensors 3 may be connected in parallel to the output terminal of the fuel cell stack 1.

[0067] Specifically, in order to ensure that the current sensor 3 can accurately detect the current supplied by the fuel cell stack 1 to the DC / DC converter 2.

[0068] The current sensor 3 used in this application also has a window. The insertion part 111 of the conductor 11 electrically connected to the output end of the fuel cell stack 1 is inserted into the interior of the current sensor 3. All four sides of the insertion part 111 can fully contact the current sensor 3. The contact resistance value here is relatively small, which can ensure that the current can flow to the current sensor 3 and be detected by the current sensor 3, thus ensuring that the current sensor 3 can accurately detect the current output from the fuel cell stack 1 to the DC / DC converter 2.

[0069] As a preferred option, conductor 11 is made of copper busbar. During manufacturing, the copper busbar can be directly formed with an insertion part 111 for mounting the current sensor 3 and supplying current to the DC / DC converter 2. The current can be boosted in the DC / DC converter 2 for subsequent supply to high-power electrical equipment for use in heavy-duty long-distance vehicles, ships, rail transportation, and distributed power generation or energy storage.

[0070] This application can also achieve the following: control the contact resistance value between the copper busbar and the current sensor 3 to meet the requirements. This requires that the contact gap between the copper busbar insertion part 111 and the inner side wall of the current sensor 3 window meet the requirements. This application starts from the mutual abutting force between the copper busbar insertion part 111 and the inner side wall of the current sensor 3 window, and sets the magnitude of the mutual abutting force according to the actual current magnitude and accuracy to be detected, so that the contact resistance value between the copper busbar and the current sensor 3 meets the requirements.

[0071] In addition, this application uses copper busbars, which have good electrical and thermal conductivity, and can greatly reduce the loss of electrical energy from the stack 1 to the DC / DC converter 2. The DC / DC converter 2 can boost more current to meet the requirements of the fuel cell system.

[0072] In other preferred embodiments, conductor 11 may also be made of silver or aluminum alloy for conducting current and transferring heat.

[0073] Current is conducted between the fuel cell stack 1 and the DC / DC converter 2 through conductor 11. This process inevitably generates heat, which needs to be dissipated as quickly as possible. If the heat accumulates here, it will not only affect the detection accuracy of the current sensor 3, but also the reliability and safety of the fuel cell system.

[0074] The fuel cell system of this application also includes a conductive heat sink 4 and a radiator 5, which can conduct the heat away and prevent heat accumulation.

[0075] The conductive heat sink 4 and the through part 111 are electrically connected to one end of the current sensor 3. The conductive heat sink 4 has a first side 41 and a second side 42 that are arranged opposite to each other. The first side 41 of the conductive heat sink 4 is connected to the heat sink 5 through the insulating component 6, and the second side 42 of the conductive heat sink 4 is electrically connected to the input terminal of the DC / DC converter 2.

[0076] The conductive heat sink 4 serves to divert heat and conduct current. Current can be conducted to the DC / DC converter 2 through the conductive heat sink 4, and heat can also be transferred to the heat sink 5 through the conductive heat sink 4, thereby cooling the DC / DC converter 2, the fuel cell stack 1, and the conductor 11 therein. Here, the insulating component 6 is connected to the conductive heat sink 4 and the heat sink 5. It can transfer heat but does not conduct current, thus preventing current from flowing to the heat sink 5 and causing safety issues.

[0077] The conductive heat sink 4 and all the through parts 111 are electrically connected to one end of the current sensor 3. The area of ​​the conductive heat sink 4 exposed to the air is much larger than the sum of the areas of all the through parts 111 exposed to the air. Some of the heat can be transferred to the air through the conductive heat sink 4 and then dissipated, which improves the heat dissipation and cooling effect to a certain extent.

[0078] As a preferred embodiment, the conductive heat sink 4 includes an aluminum block. The aluminum block is relatively soft, and the end of the insertion part 111 can be pressed into the aluminum block and make close contact with it. The contact gap can be very small, the contact resistance at this position is very small, and the loss of current flowing through this position is very small. In addition, the aluminum block has good thermal conductivity, which can effectively transfer heat to the air and to the heat sink 5, thereby improving the heat dissipation and cooling effect.

[0079] If the distance between the current sensor 3 and the conductive heat sink 4 is too long, the insertion part 111 will protrude from the inside of the current sensor 3, and a section of it will be exposed to the air (this section is not in contact with the conductive heat sink 4). This section increases the resistance value from the fuel cell stack 1 to the DC / DC converter 2, increasing power loss and heat generation, resulting in losses. Therefore, the distance between the current sensor 3 and the conductive heat sink 4 should be shortened as much as possible to minimize heat generation and current loss, so as to effectively reduce the temperature around the current sensor 3 and improve the stability and reliability of the current sensor 3.

[0080] In other preferred options, the conductive heat sink 4 can also be made of copper or silver.

[0081] The heat sink 5 can absorb the heat transferred from the conductive heat sink 4, specifically: absorb the heat generated by the conductive heat sink 4 and the current-carrying conductor 11 in the vicinity of the current sensor 3; in some preferred embodiments, the heat sink 5 can be a water-cooled heat sink 5 or an air-cooled heat sink 5, or other heat sinks known in the prior art.

[0082] The connection structure between the fuel cell stack 1 and the DC / DC converter 2 in this application is mainly used in fuel cell systems such as hydrogen fuel cell systems. The fuel cell system also includes a main housing 8, the DC / DC converter 2 is located inside the main housing 8, and the heat sink 5 is located between the main housing 8 and the stack 1 housing, which can simultaneously dissipate heat from the stack 1, the DC / DC converter 2, and the conductor 11 between them.

[0083] However, the space inside the main housing 8 is limited. In order to make effective use of the space inside the main housing 8 and facilitate the arrangement of other components, a height difference is formed between one end of the current sensor 3 through the insertion part 111 and the input end of the DC / DC converter 2. The second side 42 of the conductive heat sink 4 is electrically connected to one end of the current sensor 3 through the insertion part 111. One end of the current sensor 3 through the insertion part 111 is electrically connected to the input end of the DC / DC converter 2 through the conductive post 43.

[0084] The DC / DC converter 2 has an input positive terminal 21 and an input negative terminal 22. The input positive terminal 21 is connected to the conductive heat sink 4. Specifically, the input positive terminal 21 is electrically connected to one end of the current sensor 3 through the conductive post 43 and the conductor 11 through the insertion part 111. The conductive heat sink 4 supports the conductive post 43, the conductor 11, and the input positive terminal 21. The input positive terminal 21 can be made of copper busbar to transmit current. Here, the conductive heat sink 4 and the conductive post 43 and the conductor 11 through the insertion part 111 are electrically connected to different sides, which increases the conductive cross-section of the conductor 11 copper busbar and reduces current loss. The input negative terminal 22 is also electrically connected to the output end of the stack 1 through the conductor 11, such as the copper busbar. Furthermore, the input negative terminal 22 is in contact with the heat sink 5 through the insulating component 6. The heat sink 5 can absorb the heat generated at this location.

[0085] The insulating component 6 can be selected from components known in the prior art, which will not be listed here.

[0086] Furthermore, the positive input electrode 21 and the negative input electrode 22 form a height difference in the vertical direction, with part of the negative input electrode 22 located directly below the positive input electrode 21, so as to make more effective use of the space inside the main housing 8.

[0087] The copper busbar at the output end of the fuel cell stack 1 transmits power to the copper busbar at the input end of the DC / DC converter 2. The close proximity of the two allows the current sensor 3 to quickly detect the current parameters input to the fuel cell stack 1, ensuring its accuracy.

[0088] The DC / DC converter 2 of this application is disposed inside the main housing 8. The main housing 8 is provided with the output interface 81, power distribution interface 82, signal control interface 83, and air compressor controller output interface 84 of the DC / DC converter 2. The power distribution interface 82 is the power distribution interface of the fuel cell system used in this application, such as the hydrogen fuel cell system. The specific names and functions of the interfaces are not listed here. If the radiator 5 is a water-cooled radiator 5, the main housing 8 is also provided with a cooling water inlet 85 and a water outlet 86. The filter component 7 is locked at the opening of the main housing 8 and is insulated and limited by the outer shell of the magnetic ring 71 and the main housing 8. The magnetic ring can also reduce the ripple of current transmission to a certain extent.

[0089] A maintenance window 87 and an assembly window 88 are provided on the top surface of the main housing 8.

[0090] The maintenance window 87 is located above the fuse, such as the fuse, of the DC / DC converter 2. The maintenance window 87 is sealed with a cover. When the fuse blows, the maintenance personnel can open the cover and replace it with a new fuse, so that the DC / DC converter 2 can be put into use quickly.

[0091] The assembly window 88 is located above the output end of the fuel cell stack 1. A sheet metal part is provided at the position of the assembly window 88. The middle of the sheet metal part is recessed to form a groove. The worker can insert the fastening screw into the main housing 8 through the assembly window 88 to fasten and fix the output end of the fuel cell stack 1 to its copper busbar. Here, the copper busbar of the fuel cell stack 1 is pre-fastened and fixed to the copper busbar of the input end of the DC / DC converter 2. If the worker accidentally shakes off the screw, the screw will only remain in the groove of the sheet metal part, and the worker can quickly pick it up.

[0092] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0093] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0094] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A fuel cell system, characterized in that, Includes fuel cell stack, DC / DC converter, and filter components; The filter component has a plug-in hole and a capacitive spring element that is at least partially disposed inside the plug-in hole; The output end of the fuel cell stack is inserted into the insertion hole, causing the capacitor spring element to partially deform within the insertion hole, thereby abutting against the output end of the fuel cell stack and the inner wall of the insertion hole respectively. The input terminal of the DC / DC converter is electrically connected to the filter component.

2. The fuel cell system according to claim 1, characterized in that, The capacitive elastic element has a bending portion and multiple gripping portions; The gripping parts are spaced apart, and the end of each gripping part is bent, with the bending direction being consistent with the bending direction of the bending part.

3. The fuel cell system according to claim 2, characterized in that, The bending section has multiple perforated holes at the bending points.

4. The fuel cell system according to claim 3, characterized in that, The gripping parts are evenly spaced and arranged in the same direction, and the arrangement direction of the hollow holes is the same as that of the gripping parts.

5. The fuel cell system according to claim 2, characterized in that, The bending portion has at least two ends that are spaced apart, and each end is simultaneously connected to the root of at least two gripping portions.

6. The fuel cell system according to claim 1, characterized in that, The filtering component also includes a magnetic ring and a capacitor component; The magnetic ring has the insertion hole; The capacitor spring element and the capacitor component are electrically connected, and a portion of the capacitor spring element extends into the insertion hole. The capacitor component is electrically connected to the DC / DC converter.

7. The fuel cell system according to claim 6, characterized in that, The filter assembly includes two of the aforementioned capacitive spring elements; the magnetic ring includes two of the aforementioned insertion holes; The output terminal of the fuel cell stack has a positive output terminal and a negative output terminal; The positive output terminal is inserted into one of the plug holes, and one of the capacitor spring members abuts against the positive output terminal; The negative output terminal is inserted into another of the aforementioned sockets, and another of the aforementioned capacitor springs abut against the negative output terminal.

8. The fuel cell system according to claim 1, characterized in that, The output terminal of the fuel cell stack is electrically connected to a conductor, which has multiple insertion portions. Each insertion portion has a current sensor disposed on its outer periphery, and one end of the insertion portion that extends out of the current sensor is electrically connected to the input terminal of the DC / DC converter.

9. The fuel cell system according to claim 8, characterized in that, The fuel cell system also includes a conductive heat sink and a heat sink; The conductive heat sink and the insertion part are electrically connected to one end of the current sensor. The conductive heat sink has a first side and a second side that are disposed opposite to each other; The first side of the conductive heat sink is connected to the heat sink via an insulating component, and the second side of the conductive heat sink is electrically connected to the input terminal of the DC / DC converter.

10. The fuel cell system according to claim 9, characterized in that, A height difference is formed between the end of the insertion part that extends out of the current sensor and the input terminal of the DC / DC converter; The second side of the conductive heat sink and one end of the insertion part that protrudes from the current sensor are electrically connected. One end of the insertion part that extends out of the current sensor is electrically connected to the input terminal of the DC / DC converter via a conductive post.

Images