CN114464837B - Fuel cell system and assembly process - Google Patents
Fuel cell system and assembly process Download PDFInfo
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- CN114464837B CN114464837B CN202111173443.7A CN202111173443A CN114464837B CN 114464837 B CN114464837 B CN 114464837B CN 202111173443 A CN202111173443 A CN 202111173443A CN 114464837 B CN114464837 B CN 114464837B
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- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 62
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims 1
- 230000006978 adaptation Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000011900 installation process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2404—Processes or apparatus for grouping fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a fuel cell system and an assembly process, wherein the fuel cell system comprises a shell, a central manifold and 2 electric stacks, wherein the central manifold and the 2 electric stacks are positioned in the shell; the 2 electric piles are connected with the shell, and the central manifold is arranged between the 2 electric piles; the central manifold is connected to the air inlet end plates of the 2 electric stacks, and at least 2 groups of positioning structures are arranged on the central manifold and the air inlet end plates; the shell is provided with an assembly hole, the fluid input pipeline and the fluid output pipeline of the central manifold extend out of the shell through the assembly hole, and a gap between the fluid input pipeline and the assembly hole and a gap between the fluid output pipeline and the assembly hole are sealed through at least 1 sealing piece. The invention can realize the power output of the high-power electric pile for power improvement through the two lower-power electric piles, and can accurately ensure the adaptation between the fluid pipelines of the adapting device and between the adapting device and other parts and ensure the sealing performance of the fuel cell system.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell system and an assembly process.
Background
The fuel cell stack is generally formed by connecting a plurality of unit cells each comprising a membrane electrode and a bipolar plate in series, wherein a seal ring is provided between the membrane electrode and the bipolar plate, and compression, insulation, current output are performed at both ends of the plurality of unit cells through an end plate, an insulating plate, a current collecting plate, and the like.
As the power output requirement of the whole vehicle is continuously improved, the output power of the fuel cell stack is also continuously improved; as the integrated level requirements of the whole vehicle are increased, the integrated level requirements of the fuel cell stack are also gradually increased. In view of the continuous supply and removal of the reaction medium required for the electrochemical reaction of a fuel cell, a central manifold, which is an adapter device for connecting a plurality of stacks and adapting the reaction medium, is usually arranged inside the housing of the fuel cell stack. Considering that the fuel cell has large output working voltage and high working current, the overall electrical safety requirement of the fuel cell is high, the insulation resistance requirement is high, and the material of the adapting device is usually a nonmetallic material with high electrical safety performance; the number of flow channels of the adapter device is typically 6 or 7 or more, considering the variety of fuel cell media.
However, after the adapter device is introduced in the prior art, effective sealing between the adapter device and the shell cannot be ensured, the technical problem of sealing failure exists, and meanwhile, the adaptation between the fluid pipelines of the adapter device and between the adapter device and other parts cannot be accurately ensured.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fuel cell system and an assembly process, which can accurately ensure the adaptation between the fluid pipelines of the adapting device and between the adapting device and other parts, and ensure the sealing performance of the fuel cell system.
The technical scheme adopted for achieving the purpose of the invention is that the fuel cell system comprises a shell, a central manifold and 2 electric stacks, wherein the central manifold and the 2 electric stacks are positioned in the shell; the 2 electric stacks are connected with the shell, and the central manifold is arranged between the 2 electric stacks; the central manifold is connected to the air inlet end plates of the 2 electric stacks, and at least 2 groups of positioning structures are arranged on the central manifold and the air inlet end plates; the shell is provided with an assembly hole, the fluid input pipeline and the fluid output pipeline of the central manifold extend out of the shell through the assembly hole, and a gap between the fluid input pipeline and the assembly hole and a gap between the fluid output pipeline and the assembly hole are sealed through at least 1 sealing piece.
Further, the positioning structure comprises positioning holes and positioning pins arranged in the positioning holes, and the positioning holes are correspondingly formed in the central manifold and the air inlet end plate.
Further, the positioning structure comprises a positioning hole and a positioning boss, wherein one of the positioning hole and the positioning boss is arranged on the central manifold, and the other positioning hole and the positioning boss are arranged on the air inlet end plate.
Further, guide sleeves protruding out of the outer molded surface of the shell and corresponding to the assembly holes one by one are arranged at the bottom of the shell, and mounting grooves for mounting the sealing elements are formed in the guide sleeves and/or the corresponding fluid input pipelines/fluid output pipelines.
Further, at least 2 seals are disposed between each guide sleeve and the corresponding fluid input/output pipe along the axial direction at intervals.
Based on the same inventive concept, the invention also provides an assembly process applied to the fuel cell system, which comprises the following steps:
placing the central manifold between the 2 electric stacks, positioning the central manifold and the air inlet end plates of the 2 electric stacks through the at least 2 groups of positioning structures, and connecting and fixing the air inlet end plates and the central manifold so as to assemble the 2 electric stacks and the central manifold to form a sub-assembly;
and loading the sub-assembly into the shell, and correspondingly extending the fluid input pipeline and the fluid output pipeline of the central manifold into the corresponding assembly holes and penetrating out of the shell.
Further, before the central manifold is positioned with the intake end plates of the 2 stacks, the assembly process further includes: the central manifold is calibrated such that the position of the fluid input conduit and/or the fluid output conduit is the same as the design position.
Further, the calibrating the central manifold specifically includes:
calibrating the central manifold through a profiling tool; the profiling tool is provided with a boss for supporting the air inlet end plate and a guide cylinder for the fluid input pipeline/fluid output pipeline to extend out of the shell, the boss is identical to the protruding part on the shell in structure, and the guide cylinder is identical to the assembly hole in structure.
Further, the positioning structure comprises a positioning hole and a positioning pin arranged in the positioning hole, and the positioning holes are correspondingly formed in the central manifold and the air inlet end plate; the positioning of the central manifold and the air inlet end plates of the 2 stacks specifically comprises:
the central manifold is aligned with the locating holes on the intake end plate, and the locating pins are threaded through the locating holes of the central manifold and the intake end plate to locate the central manifold and the intake end plate.
Further, the positioning structure comprises a positioning hole and a positioning boss which are matched, wherein one of the positioning hole and the positioning boss is arranged on the central manifold, and the other positioning hole and the positioning boss are arranged on the air inlet end plate; the positioning of the central manifold and the air inlet end plates of the 2 stacks specifically comprises:
aligning the matched positioning holes and the positioning bosses which are respectively arranged on the central manifold and the air inlet end plate, and aligning and sleeving the positioning bosses and the positioning holes one by one
As can be seen from the above technical solution, the fuel cell system provided by the present invention includes a housing, a central manifold and 2 stacks located in the housing; the 2 electric piles are connected with the shell, the central manifold is arranged between the 2 electric piles and connected to the air inlet end plates of the 2 electric piles, the central manifold is used for distributing the 2 electric piles respectively, the 2 electric piles are integrated together, high-power electric pile power output of power lifting through the two smaller electric piles can be achieved, and particularly, the power lifting of the mirror-symmetrical middle-low-power electric piles is achieved, at least 2 groups of positioning structures are arranged on the central manifold and the air inlet end plates, so that the connection fixation positioning accuracy is guaranteed, the central manifold is fixed on the shell through electric pile brief introduction, and the technical problems that positioning deviation exists between the central manifold and the end plates and multiple adjustment is needed are avoided. The assembly holes are formed in the shell, the fluid input pipeline and the fluid output pipeline of the central manifold extend out of the shell through the assembly holes, gaps between the fluid input pipeline and the assembly holes and gaps between the fluid output pipeline and the assembly holes are sealed through at least 1 sealing piece, the overall sealing performance of the fuel cell system is guaranteed, the fuel cell stack shell is effectively waterproof and dustproof, the problem that an internal adapting device of the fuel cell stack shell, namely the sealing between the fluid pipeline of the central manifold and the shell, is achieved, adaptation between pipelines and between different parts is achieved, and working stability is guaranteed.
The invention provides an assembling process applied to a fuel cell system, which is characterized in that before an air inlet end plate and a central manifold are connected and fixed, the air inlet end plate and the central manifold are positioned in advance through a positioning structure, so that the positioning precision of connection and fixation is ensured, the position precision of the central manifold mounted on the air inlet end plate of a cell stack at two sides can be better ensured, 2 cells are simultaneously distributed through one central manifold, and the positions and the adaptation of the central manifold and the two cells are ensured.
Compared with the assembly process that both the electric pile and the central manifold are directly and fixedly connected with the shell in the prior art, the invention ensures that the flow passage of the central manifold is directly aligned and communicated with the flow passage opening of the air inlet end plate on one hand by directly fixing the central manifold on the air inlet end plate of the electric pile, and solves the technical problem that the communication between the central manifold and the end plate cannot be ensured in the prior art; after the assembly is formed, the central manifold is indirectly fixed through the fixation of the galvanic pile in the shell, but the central manifold is not directly connected with the shell, the two galvanic piles and the central manifold are not required to be respectively fixed on the shell for three times, the installation process is simple, the implementation is convenient, and the assembly precision is high.
Drawings
Fig. 1 is a diagram showing the overall structure of a fuel cell system according to embodiment 1 of the present invention;
fig. 2 is a front view of the fuel cell system of fig. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is an enlarged schematic view of the bottom of FIG. 3;
FIG. 5 is a cross-sectional view of C-C in FIG. 2;
fig. 6 is a left side view of the fuel cell system of fig. 1;
FIG. 7 is a D-D sectional view of FIG. 6;
FIG. 8 is an enlarged schematic view of FIG. 7 at E;
fig. 9 is a schematic perspective view of a profiling tool provided in embodiment 2 of the present invention;
FIG. 10 is another view of the profiling tool of FIG. 9;
FIG. 11 is a front view of the profiling tool of FIG. 9;
fig. 12 is a top view of the profiling tool of fig. 9.
Reference numerals: 1-a shell, 11-a first box body, 12-a second box body, 13-a guide sleeve and 14-a first protruding part; 2-pile, 21-air inlet end plate; 3-a central manifold; 4-positioning structure; 5-a seal; 6-profiling tool, 61-boss and 62-guide cylinder.
Detailed Description
In order to make the technical solution more clearly understood by those skilled in the art, the following detailed description is made with reference to the accompanying drawings.
In order to solve the technical problems, the invention provides a fuel cell system and an assembly process, which can accurately ensure the adaptation among the fluid pipelines of a central manifold, an adaptation device and other parts by improving the connection relation, the structure and the assembly steps among a galvanic pile, the central manifold and a shell. The following describes the invention in detail by way of 2 specific examples:
example 1
The embodiment of the invention provides a fuel cell system, which comprises a shell 1, a central manifold 3 positioned in the shell 1 and 2 electric stacks 2; the 2 electric piles 2 are all connected with the shell 1, the central manifold 3 is arranged between the 2 electric piles 2, the central manifold 3 is connected to the air inlet end plates 21 of the 2 electric piles 2, the central manifold 3 is used for distributing air to the 2 electric piles 2 respectively, the 2 electric piles 2 are integrated together, the power output of the high-power electric pile 2 which is subjected to power lifting through the two smaller power electric piles 2 can be realized, especially, the power lifting of the mirror-symmetrical middle-small power electric pile 2 is realized, at least 2 groups of positioning structures 4 are arranged on the central manifold 3 and the air inlet end plates 21 so as to ensure the accurate positioning of connection fixation, and the central manifold 3 is fixed on the shell 1 through the brief introduction of the electric piles 2, so that the technical problems of positioning deviation and multiple adjustment are avoided between the central manifold 3 and the end plates. The assembly holes are formed in the shell 1, the fluid input pipeline and the fluid output pipeline of the central manifold 3 extend out of the shell 1 through the assembly holes, gaps between the fluid input pipeline and the assembly holes and gaps between the fluid output pipeline and the assembly holes are sealed through at least 1 sealing piece 5, the overall sealing performance of the fuel cell system is guaranteed, the fuel cell stack 2 is effectively waterproof and dustproof, the problem that an internal adapting device of the shell 1 of the fuel cell stack 2, namely, the sealing between the fluid pipeline of the central manifold 3 and the shell 1 is solved, the adaptation between pipelines and between different parts is realized, and the working stability is guaranteed.
In the prior art, 2 stacks 2 and a central manifold 3 are usually fixed to a housing 1, but the conventional solution has the following disadvantages: on the one hand, three times of assembly and fixation are needed to be carried out on the shell 1, and the assembly steps are complicated; on the other hand, the central manifold 3 is used for air intake and distribution of the two stacks 2, but the existing scheme cannot guarantee the precise alignment of the two flow passage ports. In this embodiment, the central manifold 3 and the air inlet end plate 21 are assembled in advance, and the positioning structure 4 is used for ensuring the relative positions of the central manifold 3 and the air inlet end plate 21 before the central manifold 3 and the air inlet end plate 21 are locked and fixed by the connecting piece, directly ensuring the direct communication between the central manifold 3 and the end plate, and avoiding multiple disassembly and adjustment caused by position deviation after the locking. The present invention does not limit the specific embodiment of the positioning structure 4, as long as the pre-alignment can be achieved, as an alternative, the positioning structure 4 includes positioning holes and positioning pins installed in the positioning holes, and the central manifold 3 and the air inlet end plate 21 are respectively provided with positioning holes. As another alternative, the positioning structure 4 includes positioning holes and positioning bosses, one of which is provided on the central manifold 3 and the other of which is provided on the intake end plate 21.
In order to enable the central manifold 3 to be precisely guided and positioned, and further ensure that no position deviation and extrusion conditions exist, in the embodiment, guide sleeves 13 protruding out of the outer molded surface of the shell 1 and corresponding to the assembly holes one by one are arranged at the bottom of the shell 1, and in the embodiment, mounting grooves for mounting the sealing elements 5 are formed in the guide sleeves 13 and/or corresponding fluid input pipelines/fluid output pipelines in order to ensure water resistance and dust resistance of the fuel cell system.
In order to further ensure the stability of the operation of the fuel cell system, in this embodiment, at least 2 sealing members 5 are provided between each guide sleeve 13 and the corresponding fluid input pipe/fluid output pipe at intervals in the axial direction to ensure effective water and dust resistance by double sealing.
In order to ensure that the positions of the two air inlet end plates 21 and the positions of the air inlet end plates 21 and the central manifold 3 are relatively fixed, and avoid affecting the air distribution of the central manifold 3, in this embodiment, the first box 11 and the second box 12 of the housing 1 enclose a mounting cavity for mounting the electric pile 2 and the manifold, at least two first protruding parts 14 and second protruding parts are arranged on the inner surface of the second box 12 at intervals, the air inlet end plates 21 of the 2 electric piles 2 are respectively arranged on the corresponding first protruding parts 14, the blind end plates of the 2 electric piles 2 are respectively arranged on the corresponding second protruding parts, at least the first protruding parts 14 are provided with through holes, and connecting pieces for connecting the lower housing 1 and the air inlet end plates 21 are arranged in the through holes, so that the connection and the fixation of the air inlet end plates 21 and the second box 12 are realized. In the present embodiment, each intake end plate 21 is supported by 3 first projecting portions 14 provided at intervals, and at least one of the 3 first projecting portions is provided with a through hole.
Considering the molding, the crash and impact protection, EMC requirements of auxiliary equipment (BOP), etc., the fuel cell stack 2 housing 1 is typically composed of a high strength metal (e.g., aluminum alloy, etc.) or a high strength composite material (e.g., SMC, etc.). Considering that the fuel cell has large output working voltage and high working current, the whole fuel cell has high electrical safety requirement and high insulation resistance requirement, and the material of the adapting device is usually a nonmetallic material with high electrical safety performance. The invention can solve the sealing between each pipeline of the central manifold 3 in the shell 1 of the fuel cell stack 2 and the shell 1, and can realize the adaptation among each pipeline, different materials and different parts.
Example 2
Based on the same inventive concept, the embodiment of the present invention also provides an assembly process applied to the fuel cell system provided in embodiment 1, including the following steps:
the central manifold 3 is placed between 2 electric piles 2, the central manifold 3 and the air inlet end plates 21 of the 2 electric piles 2 are positioned through at least 2 groups of positioning structures 4, and the air inlet end plates 21 and the central manifold 3 are fixedly connected, so that the 2 electric piles 2 and the central manifold 3 are assembled to form a sub-assembly;
the sub-assembly is installed in the housing 1, and the fluid input pipe and the fluid output pipe of the central manifold 3 are correspondingly inserted into the corresponding assembly holes and penetrate out of the housing 1.
The assembling process for assembling the fuel cell system provided by the invention has the advantages that before the air inlet end plate 21 and the central manifold 3 are fixedly connected, the air inlet end plate 21 and the central manifold 3 are positioned in advance, the positioning precision of connection and fixation is ensured, the position precision of the central manifold 3 mounted on the air inlet end plate 21 of the electric pile 2 at two sides can be better ensured, 2 electric piles 2 are simultaneously distributed through one central manifold 3, and the positions and the adaptation of the central manifold 3 and the two electric piles 2 are ensured.
Compared with the scheme that both the electric pile 2 and the central manifold 3 are directly and fixedly connected with the shell 1 in the prior art, the central manifold 3 is directly fixed on the air inlet end plate 21 of the electric pile 2 in the assembly process provided by the embodiment, so that on one hand, the flow passage of the central manifold 3 and the flow passage opening of the air inlet end plate 21 are directly aligned and communicated, and the technical problem that the communication between the central manifold 3 and the end plate cannot be ensured in the prior art is solved; after the assembly is formed, the central manifold 3 is indirectly fixed through the fixation of the electric pile 2 in the shell 1, but the central manifold 3 is not directly connected with the shell 1, and the two electric piles 2 and the central manifold 3 are not required to be respectively fixed on the shell 1 for three times, so that the installation process is simple, the implementation is convenient, and meanwhile, the assembly precision is high.
In order to ensure that each flow channel of the central manifold 3 is perfectly matched with the assembly hole and the guide sleeve 13, and avoid factors that are detrimental to the service life of the housing 1 and the working stability of the fuel cell system, such as positional deviation and extrusion caused by the positional deviation, in this embodiment, before the central manifold 3 is positioned with the intake end plates 21 of the 2 stacks 2, the assembly process further includes: the central manifold 3 is calibrated so that the position of the fluid input and/or output pipes is the same as the design position, mainly by adjusting the angle, position, etc. of each fluid pipe accordingly when smooth and accurate alignment is not possible.
In order not to damage the housing 1 and to simplify the operation of the calibration step, in this embodiment, the calibration of the central manifold 3 specifically comprises:
calibrating the central manifold 3 through a profiling tool 6; the profiling tool 6 is provided with a boss 61 for supporting the air inlet end plate 21 and a guide cylinder 62 for extending the fluid input pipeline/fluid output pipeline out of the casing 1, and the boss 61 has the same structure as the first protruding part 14 on the casing 1, and the guide cylinder 62 has the same structure as the assembly hole, in this embodiment, the profiling tool 6 uses 1:1 re-engraving the bottom structure of the housing 1, here 1: the profiling tool 6 is provided with all structures related to the assembly of the shell 1 and the central manifold 3, and the sizes and the relative positions are identical, so that the positions between the pipelines of the central manifold 3 and the shell 1 can be well ensured. The first protruding portion 14 checks whether the width dimension of the adapting device is out of tolerance, whether the flatness of the adapting device and the matching plane of the end plates of the two-end galvanic pile 2 meets the requirement, and whether the adapting device is interfered with a positioning boss on the shell 1 of the galvanic pile 2, which is fixed with the end plates of the two-end galvanic pile 2. The invention does not limit the structure of the profiling tool 6 and the shell 1, and can take the profiling tool 6 shown in the drawing as an example according to specific conditions, and 6 bosses 61 which are completely the same as the structure of 6 first protruding parts 14 on the shell 1 can check whether the width dimension of the central manifold 3 is out of tolerance, whether the flatness of the matching plane of the central manifold 3 and the end plates of the two-end galvanic pile 2 meets the requirement, and whether the central manifold 3 interferes with the positioning bosses on the shell 1 of the galvanic pile 2 and fixed with the end plates of the two-end galvanic pile 2 under static state.
As in embodiment 1, in order to achieve the locking connection of the connector once and avoid multiple disassembly and adjustment, as an alternative, the positioning structure 4 includes positioning holes and positioning pins installed in the positioning holes, and the central manifold 3 and the air inlet end plate 21 are respectively provided with positioning holes. At this time, the positioning of the central manifold 3 and the intake end plates 21 of the 2 stacks 2 specifically includes:
the center manifold 3 is aligned with the positioning holes on the intake end plate 21, and positioning pins are inserted through the positioning holes of the center manifold 3 and the intake end plate 21 to position the center manifold 3 and the intake end plate 21.
As another alternative, the positioning structure 4 comprises matching positioning holes and positioning bosses, one of which is provided on the central manifold 3 and the other on the intake end plate 21. At this time, the positioning of the central manifold 3 and the intake end plates 21 of the 2 stacks 2 specifically includes:
the positioning holes and the positioning bosses which are respectively arranged on the central manifold 3 and the air inlet end plate 21 and matched with each other are aligned, and the positioning bosses and the positioning holes are aligned one by one and sleeved.
In order to seal the gap between the central manifold 3 and the housing 1, in this embodiment, after the fluid input pipe and the fluid output pipe of the central manifold 3 are respectively inserted into the corresponding fitting holes and pass out of the housing 1, the fitting process further includes sealing the gap between each fluid input pipe and the fitting hole and the gap between each fluid output pipe and the fitting hole by at least 1 sealing member 5.
Through the embodiment, the invention has the following beneficial effects or advantages:
1) The invention can realize the power output of the high-power electric pile for power lifting by two small-power electric piles, in particular to the power lifting of the middle-power electric pile for mirror symmetry, and can effectively solve the sealing between a plurality of runners of an internal adapting device of a fuel cell electric pile shell and the shell, and realize the adaptation among multiple pipelines, different materials and different parts.
2) Compared with the assembly process that both the electric pile and the central manifold are directly and fixedly connected with the shell in the prior art, the invention ensures that the flow passage of the central manifold is directly aligned and communicated with the flow passage opening of the air inlet end plate on one hand by directly fixing the central manifold on the air inlet end plate of the electric pile, and solves the technical problem that the communication between the central manifold and the end plate cannot be ensured in the prior art; after the assembly is formed, the central manifold is indirectly fixed through the fixation of the galvanic pile in the shell, but the central manifold is not directly connected with the shell, the two galvanic piles and the central manifold are not required to be respectively fixed on the shell for three times, the installation process is simple, the implementation is convenient, and the assembly precision is high.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A fuel cell system comprising a housing, and a central manifold and 2 stacks located in the housing; the 2 electric stacks are connected with the shell, and the central manifold is arranged between the 2 electric stacks; the central manifold is connected to the air inlet end plates of the 2 electric stacks, and at least 2 groups of positioning structures are arranged on the central manifold and the air inlet end plates; the shell is provided with an assembly hole, the fluid input pipeline and the fluid output pipeline of the central manifold extend out of the shell through the assembly hole, and a gap between the fluid input pipeline and the assembly hole and a gap between the fluid output pipeline and the assembly hole are sealed through at least 1 sealing piece; the bottom of the shell is provided with guide sleeves protruding out of the outer molded surface of the shell and corresponding to the assembly holes one by one, and the sealing piece is arranged between the guide sleeves and the corresponding fluid input pipeline or fluid output pipeline.
2. The fuel cell system according to claim 1, wherein the positioning structure includes positioning holes and positioning pins mounted in the positioning holes, the positioning holes being provided on the center manifold and the intake end plate, respectively.
3. The fuel cell system of claim 1, wherein the locating structure includes a locating hole and a locating boss, one of the locating hole and the locating boss being disposed on the central manifold and the other being disposed on the intake end plate.
4. A fuel cell system according to any one of claims 1 to 3, wherein the guide sleeve and/or the corresponding fluid inlet conduit or fluid outlet conduit is provided with a mounting groove for mounting the seal.
5. The fuel cell system according to claim 4, wherein at least 2 seals are provided between each of the guide sleeves and the corresponding fluid input/output pipe in an axial direction.
6. An assembly process applied to the fuel cell system according to any one of claims 1 to 5, characterized in that the assembly process comprises the steps of:
placing the central manifold between the 2 electric stacks, positioning the central manifold and the air inlet end plates of the 2 electric stacks through the at least 2 groups of positioning structures, and connecting and fixing the air inlet end plates and the central manifold so as to assemble the 2 electric stacks and the central manifold to form a sub-assembly;
and loading the sub-assembly into the shell, and correspondingly extending the fluid input pipeline and the fluid output pipeline of the central manifold into the corresponding assembly holes and penetrating out of the shell.
7. The assembly process of claim 6, wherein prior to positioning the center manifold with the intake end plates of the 2 stacks, the assembly process further comprises: the central manifold is calibrated such that the position of the fluid input conduit and/or the fluid output conduit is the same as the design position.
8. The assembly process of claim 7, wherein said calibrating said central manifold to position said fluid input conduit and/or said fluid output conduit to be identical to a design position comprises:
calibrating the central manifold through a profiling tool; the profiling tool is provided with a boss for supporting the air inlet end plate and a guide cylinder for the fluid input pipeline/fluid output pipeline to extend out of the shell, the boss is identical to the protruding part on the shell in structure, and the guide cylinder is identical to the assembly hole in structure.
9. The assembly process according to any one of claims 6 to 8, wherein the positioning structure includes positioning holes and positioning pins installed in the positioning holes, the positioning holes being correspondingly provided on the central manifold and the intake end plate; the positioning of the central manifold and the air inlet end plates of the 2 stacks by the at least 2 groups of positioning structures specifically comprises:
the central manifold is aligned with the locating holes on the intake end plate, and the locating pins are threaded through the locating holes of the central manifold and the intake end plate to locate the central manifold and the intake end plate.
10. The assembly process of any one of claims 6-8, wherein the locating structure includes mating locating holes and locating bosses, one of the locating holes and locating bosses being disposed on the central manifold and the other being disposed on the intake end plate; the positioning of the central manifold and the air inlet end plates of the 2 stacks by the at least 2 groups of positioning structures specifically comprises:
and aligning the positioning holes and the positioning bosses which are respectively arranged on the central manifold and the air inlet end plate and matched with each other, wherein the positioning bosses and the positioning holes are aligned one by one and sleeved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111173443.7A CN114464837B (en) | 2021-10-08 | 2021-10-08 | Fuel cell system and assembly process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111173443.7A CN114464837B (en) | 2021-10-08 | 2021-10-08 | Fuel cell system and assembly process |
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|---|---|
| CN114464837A (en) | 2022-05-10 |
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