CN220021187U - Fuel cell stack compression force compensation mechanism and fuel cell stack - Google Patents
Fuel cell stack compression force compensation mechanism and fuel cell stack Download PDFInfo
- Publication number
- CN220021187U CN220021187U CN202321042193.8U CN202321042193U CN220021187U CN 220021187 U CN220021187 U CN 220021187U CN 202321042193 U CN202321042193 U CN 202321042193U CN 220021187 U CN220021187 U CN 220021187U
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- fuel cell
- cell stack
- grooves
- disc spring
- compression force
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- 239000000446 fuel Substances 0.000 title claims abstract description 58
- 230000006835 compression Effects 0.000 title claims abstract description 25
- 238000007906 compression Methods 0.000 title claims abstract description 25
- 230000000712 assembly Effects 0.000 claims description 12
- 238000000429 assembly Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
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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
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- Fuel Cell (AREA)
Abstract
The utility model relates to the technical field of fuel cells and discloses a fuel cell stack compression force compensation mechanism and a fuel cell stack, wherein the fuel cell stack compression force compensation mechanism comprises an upper end plate arranged at the upper end of a reactor core of the fuel cell stack, a plurality of grooves are formed in the upper end plate, a disc spring assembly is placed on each groove, the disc spring assembly is formed by stacking a plurality of disc springs, and a central hole of the disc spring assembly is formed by a plurality of through holes in the middle of the disc springs; the connecting device comprises a groove, and is characterized by further comprising a cover plate, wherein a plurality of connecting columns are arranged on the cover plate in one-to-one correspondence with the groove, and the connecting ends of the connecting columns penetrate through the central hole and are inserted into the groove. The utility model can keep the compression force of the reactor core of the fuel cell stack within the working requirement range during the service period of the fuel cell stack, and prolong the service life of the fuel cell stack; the thicknesses of the spring end plate and the spring cover plate can be reduced as much as possible in a controllable range, so that the volume power density and the mass power density of the electric pile are increased.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to a compressing force compensation mechanism of a fuel cell stack and the fuel cell stack.
Background
Currently, in most fuel cell pile structures, a compression force compensation structure in a stacking direction is not designed, so that the thickness of a pile core (formed by stacking bipolar plates, membrane electrodes and sealing elements) is changed along with time during service of the fuel cell pile, and the compression force of the pile core is more likely to not meet pile sealing requirements, so that pile failure is caused.
In a few compression force compensation structures with the design stacking direction, holes with the heights similar to those of the disc springs are formed in the spring end plates or the spring cover plates, the disc springs are placed in the holes, and the disc springs are fixed through the walls of the holes so as not to transversely displace. Such a manner of fixing the disc springs may cause an increase in the thickness of the spring end plates or the spring cover plates, thereby increasing the volume and weight of the fuel cell stack and thus reducing the volumetric power density and the mass power density of the fuel cell stack.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a compression force compensation mechanism of a fuel cell stack and the fuel cell stack, which can keep the compression force of a stack core in a working requirement range during the service period of the fuel cell stack, thereby prolonging the service life of the stack; the thicknesses of the spring end plate and the spring cover plate can be reduced as much as possible in a controllable range, so that the volume power density and the mass power density of the electric pile are increased.
The technical scheme adopted for solving the technical problems is as follows:
the compressing force compensation mechanism of the fuel cell stack comprises an upper end plate arranged at the upper end of a reactor core of the stack, wherein a plurality of grooves are formed in the upper end plate, a disc spring assembly is placed on each groove, the disc spring assembly is formed by stacking a plurality of disc springs, and a central hole of the disc spring assembly is formed by a plurality of through holes in the middle of the disc springs;
the connecting device comprises a groove, and is characterized by further comprising a cover plate, wherein a plurality of connecting columns are arranged on the cover plate in one-to-one correspondence with the groove, and the connecting ends of the connecting columns penetrate through the central hole and are inserted into the groove.
Preferably, a plurality of positioning grooves are arranged on the upper end plate in one-to-one correspondence with the grooves, the positioning grooves are arranged above the grooves and are coaxially arranged with the grooves, and the lower ends of the disc spring assemblies are arranged in the positioning grooves.
Preferably, the diameter of the positioning groove is larger than the diameter of the groove.
Preferably, a plurality of limit grooves are arranged on the cover plate in one-to-one correspondence with a plurality of connecting columns, the limit grooves are arranged on the outer sides of the connecting columns and are coaxially arranged with the connecting columns, and the upper ends of the disc spring assemblies are placed in the limit grooves.
Preferably, the connecting column is hollow inside.
The fuel cell pile comprises the fuel cell pile pressing force compensation mechanism, a pile core and a lower end plate, wherein the pile core is arranged between the upper end plate and the lower end plate.
Preferably, a strap for fastening the fuel cell stack is provided between the lower end plate and the cover plate.
Preferably, the electric pile core is composed of a plurality of stacked bodies which are sequentially stacked.
The fuel cell stack compression force compensation mechanism and the fuel cell stack have the beneficial effects that compared with the prior art: by arranging the disc spring component between the cover plate and the upper end plate, after the fuel cell pile is assembled, the compression force of the pile core of the fuel cell pile can be kept within the working requirement range during the service period of the fuel cell pile, so that the service life of the pile is prolonged. Meanwhile, by arranging the grooves on the upper end plate, the connecting columns are arranged on the cover plate corresponding to the grooves, the connecting ends of the connecting columns penetrate through the central holes of the disc spring assemblies and are inserted into the grooves, the disc spring assemblies are fixed, and the thickness of the upper end plate and the cover plate can be reduced as much as possible in a controllable range due to the adoption of the fixing mode of the connecting columns and the grooves, so that the volume power density and the mass power density of the galvanic pile are increased. The utility model has simple structure, good use effect and easy popularization and use.
Drawings
Fig. 1 is a schematic structural view of a fuel cell stack pressing force compensation mechanism of the present utility model.
Fig. 2 is a schematic structural view of a fuel cell stack of the present utility model.
Wherein: the device comprises a 1-upper end plate, a 2-groove, a 3-disc spring assembly, a 4-cover plate, a 5-connecting column, a 6-positioning groove, a 7-limiting groove, an 8-galvanic pile core, 9-binding bands and a 10-lower end plate.
Detailed Description
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
As shown in fig. 1 (for convenience of labeling, one disc spring assembly 3 on the leftmost side of fig. 1 is removed, but is required to be installed in practical use), a fuel cell stack compression force compensation mechanism according to a preferred embodiment of the present utility model includes an upper end plate 1 disposed at the upper end of a stack core 8, a plurality of grooves 2 are disposed on the upper end plate 1, one disc spring assembly 3 is disposed on each groove 2, the disc spring assembly 3 is formed by stacking a plurality of disc springs, and a plurality of through holes in the middle of the disc springs form a central hole of the disc spring assembly 3. The stacking order and number of the belleville springs are determined according to the pile assembly force, the total height of the pile core 8, the compression force value to be compensated, and the like (prior art).
The novel connecting structure comprises a groove 2, and is characterized by further comprising a cover plate 4, wherein a plurality of connecting columns 5 are arranged on the cover plate 4 in one-to-one correspondence with the groove 2, and the connecting ends of the connecting columns 5 penetrate through the central holes and are inserted into the groove 2.
According to the fuel cell stack compression force compensation mechanism based on the technical characteristics, the disc spring component 3 is arranged between the cover plate 4 and the upper end plate 1, so that after the fuel cell stack is assembled, the compression force of the stack core 8 of the fuel cell stack can be kept within the working requirement range during the service period of the fuel cell stack, and the service life of the stack is prolonged. Meanwhile, the groove 2 is formed in the upper end plate 1, the connecting column 5 is arranged on the cover plate 4 corresponding to the groove 2, the connecting end of the connecting column 5 penetrates through the central hole of the disc spring assembly 3 and is inserted into the groove 2, the disc spring assembly 3 is fixed, and the thickness of the upper end plate 1 and the thickness of the cover plate 4 can be reduced as much as possible in a controllable range due to the adoption of the fixing mode of the connecting column 5 and the groove 2, so that the volume power density and the mass power density of the galvanic pile are increased.
The utility model has simple structure, good use effect and easy popularization and use.
Specifically, in the newly assembled and fastened fuel cell stack state, the disc spring assemblies 3 are in a compressed state (the height of each disc spring is reduced relative to the free state). During operation of the fuel cell stack, as elastic deformation of the bipolar plates, the membrane electrodes and the sealing elements (which are stacked to form the reactor core) in the stacking direction is reduced, the assembly force of the stack is correspondingly reduced, and if the assembly force is not timely increased, the stack may have sealing failure. At this point, the butterfly spring assembly 3, by "expanding" from the compressed state (i.e., increasing the height of each belleville spring), increases the compression force on the stack core (because the overall length of the stack is unchanged under the shape constraints of the fasteners), thereby alleviating the seal failure problem that may occur with the stack core 8.
In this embodiment, a plurality of positioning grooves 6 are provided on the upper end plate 1 in a one-to-one correspondence with a plurality of grooves 2, the positioning grooves 6 are disposed above the grooves 2 and coaxially disposed with the grooves 2, the lower ends of the disc spring assemblies 3 are disposed in the positioning grooves 6, and the disc spring assemblies 3 are directly disposed in the positioning grooves 6 during installation by disposing the positioning grooves 6, so that the disc spring assemblies 3 can be conveniently installed and positioned. Meanwhile, since the positioning groove 6 is used for placing the disc spring assembly 3 and the groove 2 is used for connecting the connecting column 5, the diameter of the positioning groove 3 is larger than that of the groove 2.
In this embodiment, a plurality of limit grooves 7 are provided on the cover plate 4 in a one-to-one correspondence with a plurality of connection columns 5, the limit grooves 7 are provided on the outer side of the connection columns 5 and are coaxially provided with the connection columns 5, and the upper ends of the disc spring assemblies 3 are provided in the limit grooves 7, so that the upper ends of the disc spring assemblies 3 are positioned conveniently and are prevented from moving. Meanwhile, the connecting column 5 is hollow in the interior for reducing the weight and saving the raw materials.
As shown in fig. 2, to solve the above-mentioned technical problem, the present utility model further provides a fuel cell stack, which includes the above-mentioned fuel cell stack compression force compensation mechanism, a stack core 8, and a lower end plate 10, wherein the stack core 8 is disposed between the upper end plate 1 and the lower end plate 10. The reactor core 8 is composed of a plurality of stacked bodies which are sequentially stacked, and a binding band 9 for fastening the fuel cell stack is arranged between the lower end plate 10 and the cover plate 4, so that the integrity of the fuel cell stack is ensured.
The assembly process of the fuel cell pile comprises the steps of stacking a lower end plate 10 and a pile core stack body of the fuel cell pile in sequence, placing an upper end plate 1 at the top end of a pile core 8, placing a disc spring assembly 3 in a positioning groove 6 of the upper end plate 1, placing a cover plate 4 above the disc spring assembly, and binding a binding belt 9.
The fuel cell pile provided by the utility model can keep the compression force of the pile core in the working requirement range during the service period of the fuel cell pile, thereby prolonging the service life of the pile; the thicknesses of the spring end plate and the spring cover plate can be reduced as much as possible in a controllable range, so that the volume power density and the mass power density of the electric pile are increased.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (8)
1. A fuel cell stack compression force compensation mechanism, characterized by: the device comprises an upper end plate arranged at the upper end of a reactor core of a galvanic pile, wherein a plurality of grooves are formed in the upper end plate, a disc spring assembly is placed on each groove, the disc spring assemblies are formed by stacking a plurality of disc springs, and through holes in the middle of the disc springs form a central hole of the disc spring assembly;
the disc spring assembly comprises a disc spring assembly, and is characterized by further comprising a cover plate, wherein a plurality of connecting columns are arranged on the cover plate in one-to-one correspondence with the grooves, and the connecting ends of the connecting columns penetrate through the central holes of the disc spring assembly and are inserted into the grooves.
2. The fuel cell stack compression force compensation mechanism of claim 1, wherein: the upper end plate is provided with a plurality of positioning grooves in one-to-one correspondence with the grooves, the positioning grooves are arranged above the grooves and are coaxially arranged with the grooves, and the lower end of the disc spring assembly is placed in the positioning grooves.
3. The fuel cell stack compression force compensation mechanism of claim 2, wherein: the diameter of the positioning groove is larger than that of the groove.
4. The fuel cell stack compression force compensation mechanism of claim 1, wherein: the cover plate is provided with a plurality of limit grooves in one-to-one correspondence with the connecting columns, the limit grooves are arranged on the outer sides of the connecting columns and are coaxially arranged with the connecting columns, and the upper ends of the disc spring assemblies are placed in the limit grooves.
5. The fuel cell stack compression force compensation mechanism of claim 1, wherein: the inside of the connecting column is hollow.
6. A fuel cell stack characterized by: a fuel cell stack compression force compensation mechanism comprising any one of claims 1-5, a stack core and a lower end plate, the stack core disposed between the upper end plate and the lower end plate.
7. The fuel cell stack according to claim 6, wherein: a binding band for fastening the fuel cell stack is arranged between the lower end plate and the cover plate.
8. The fuel cell stack according to claim 6, wherein: the pile core consists of a plurality of stacked bodies which are sequentially stacked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321042193.8U CN220021187U (en) | 2023-04-28 | 2023-04-28 | Fuel cell stack compression force compensation mechanism and fuel cell stack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321042193.8U CN220021187U (en) | 2023-04-28 | 2023-04-28 | Fuel cell stack compression force compensation mechanism and fuel cell stack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220021187U true CN220021187U (en) | 2023-11-14 |
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ID=88670776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321042193.8U Active CN220021187U (en) | 2023-04-28 | 2023-04-28 | Fuel cell stack compression force compensation mechanism and fuel cell stack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220021187U (en) |
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2023
- 2023-04-28 CN CN202321042193.8U patent/CN220021187U/en active Active
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