CN114243076B - Fuel cell stack packaging method - Google Patents
Fuel cell stack packaging method Download PDFInfo
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- CN114243076B CN114243076B CN202111535717.2A CN202111535717A CN114243076B CN 114243076 B CN114243076 B CN 114243076B CN 202111535717 A CN202111535717 A CN 202111535717A CN 114243076 B CN114243076 B CN 114243076B
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- China
- Prior art keywords
- preset
- fuel cell
- pressure
- cell stack
- preset pressure
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- 239000000446 fuel Substances 0.000 title claims abstract description 52
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000003825 pressing Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 10
- 230000007423 decrease Effects 0.000 description 8
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- 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
- H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
- H01M8/248—Means for compression of the fuel cell stacks
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The application discloses a fuel cell stack packaging method. The pressure is applied to the press cap and the end plate of the fuel cell stack for N times through the preset strategy, then the first preset pressure is increased to the second preset pressure after the first preset time period is continued, finally the fuel cell stack is fastened, the elastic force of parts such as a sealing ring and an elastic piece and the attenuation of the packaging force of the polar plate and the hardware caused by creep can be reduced, therefore, the influence of the packaging force on the performance and the sealing of the fuel cell stack, particularly the later life of the stack, can be avoided, and the influence on the performance caused by the reduction of the packaging force can be effectively reduced.
Description
Technical Field
The application relates to the field of fuel cell production, in particular to a fuel cell stack packaging method.
Background
The hydrogen fuel cell pile is assembled by controlling displacement or pressure, and the end plate, disc spring, press cap, collector plate, bipolar plate and membrane electrode are fastened by screw or ribbon, so that the pile has certain sealing force, and the pile performance is ensured.
However, since the galvanic pile is composed of tens or hundreds of single cells, the parts such as the sealing ring, the disc spring and the like have compression rebound resilience in the compacting process of the galvanic pile, and creep deformation of materials such as a bipolar plate, an end plate and the like of the fuel cell galvanic pile, after the galvanic pile is compacted and fixed by using the prior art, the packaging force is greatly attenuated, the performance of the galvanic pile is reduced, the galvanic pile has the risk of waist collapse, and the leakage risk of the galvanic pile is generated in the later life.
Disclosure of Invention
In view of the above, the embodiment of the application provides a fuel cell stack packaging method, which aims to solve the problems that in the stack compression process, the packaging force is greatly attenuated, the stack performance is reduced, the stack has a waist collapse risk and the stack leakage risk is caused in the later life because parts such as a sealing ring, a disc spring and the like have compression rebound resilience and materials such as a bipolar plate and an end plate of the fuel cell stack creep.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
a fuel cell stack packaging method, comprising:
applying pressure to the press cap and the end plate of the fuel cell stack for N times according to a preset strategy, wherein the preset strategy is to continuously apply a first preset pressure to the press cap and the end plate, increase the first preset pressure to a second preset pressure after a first preset time period, and reduce the second preset pressure to the first preset pressure after a second preset time period;
increasing the first preset pressure to a second preset pressure after continuing the first preset period of time;
fastening the fuel cell stack.
Preferably, the applying of pressure to the press cap and the end plate of the fuel cell stack is repeated N times in a preset strategy, including:
and repeating the forward application of pressure to the press cap and the end plate of the fuel cell stack for N times according to a preset strategy.
Preferably, the second preset pressure increases with the number of repetitions N until the second preset pressure increases to a third preset pressure.
Preferably, the second preset pressure is incremented by a fourth preset pressure as the number of repetitions N increases.
Preferably, the first preset pressure is increased to the second preset pressure in the third time period after the first preset time period, and the second preset pressure is reduced to the first preset pressure in the fourth time period after the second preset time period.
Preferably, the third preset time period is the same as the fourth preset time period.
Preferably, the first preset time period is the same as the second preset time period.
As can be seen from the foregoing, the present application discloses a fuel cell stack packaging method, in which a pressure is applied to a press cap and an end plate of a fuel cell stack repeatedly for N times through a preset strategy, then the first preset pressure is increased to a second preset pressure after a first preset time period is continued, and finally the fuel cell stack is fastened, so that the elastic force of parts such as a seal ring, an elastic member, etc., and the attenuation of the packaging force caused by creep of a polar plate and hardware can be reduced, therefore, the performance and the sealing of the fuel cell stack can be prevented from being affected by the packaging force, and particularly, the influence on the performance due to the reduction of the packaging force in the later stage of the life of the stack can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a fuel cell stack packaging method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of applying pressure to a press cap and an end plate of a fuel cell stack repeatedly N times according to a preset strategy according to an embodiment of the present application;
FIG. 3 is a schematic illustration of applying pressure to a press cap and an end plate of a fuel cell stack according to an embodiment of the present application;
FIG. 4 is a schematic illustration of another embodiment of the present application for repeating N times the application of pressure to the press cap and end plate of a fuel cell stack according to a predetermined strategy;
fig. 5 is a graph showing the variation of the stack length reduction value of the fuel cell according to the increase of the cycle number of the packaging force.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a fuel cell stack packaging method, referring to fig. 1 to 5, fig. 1 is a flow diagram of the fuel cell stack packaging method, and the fuel cell stack packaging method at least comprises the following steps:
s1, repeatedly applying pressure to the press cap and the end plate of the fuel cell stack for N times according to a preset strategy.
It should be noted that the preset strategy is to continuously apply a first preset pressure to the press cap and the end plate, increase the first preset pressure to a second preset pressure after the first preset time period, and decrease the second preset pressure to the first preset pressure after the second preset time period.
S2, after the first preset time period is continued, the first preset pressure is increased to the second preset pressure;
s3, fastening the fuel cell stack.
It should be noted that, because the sealing between the unit cells in the stack of the fuel cell depends on the packaging force of the stack, when the packaging force is too attenuated, the poor sealing of the stack is caused, so that the attenuation of the packaging force needs to be reduced, so as to reduce the influence of the packaging force on the performance caused by the reduction of the packaging force, particularly the later stage of the life of the stack, by repeating the application of pressure to the press cap and the end plate of the stack of the fuel cell N times through a preset strategy, then increasing the first preset pressure to the second preset pressure after the first preset time period, and finally fastening the stack of the fuel cell, the elastic force of the parts such as the sealing ring, the elastic member, and the attenuation of the packaging force caused by creep of the polar plate and the hardware can be reduced, so that the performance and the sealing of the stack of the fuel cell can be prevented, particularly the influence of the packaging force on the performance caused by the reduction of the packaging force can be effectively reduced, the initial packaging force on the stack can be reduced, and the requirements on equipment can be reduced.
In the present application, the stack length of the fuel cell decreases as the number of times of repeated pressure application to the press cap and the end plate of the cell stack increases, but the stack length changes less and less as the number of times of repeated pressure application increases, and accordingly, the stack length decrease value increases as the number of times of repeated pressure application increases and the stack decrease value decreases less and less as the number of times of repeated pressure application increases, as shown in fig. 5.
It should be further noted that, as shown in fig. 2, the pressure is repeatedly applied to the pressure cap and the end plate of the fuel cell stack N times through the preset strategy, and the value of N can be set as required by a person skilled in the art.
It should be noted that the magnitudes of the first preset pressure and the second preset pressure are set by those skilled in the art according to the bipolar plate and the MEA of the fuel cell, and thus, the magnitudes of the first preset pressure and the second preset pressure are not limited.
The first preset time period and the second preset time period can be set by a person skilled in the art according to the needs, and therefore, the present application does not limit the first preset time period and the second preset time period.
Specifically, when step S1 is executed, the specific execution procedure of step S1 includes the following steps:
and repeating the forward application of pressure to the press cap and the end plate of the fuel cell stack for N times according to a preset strategy.
In a specific implementation process, referring to fig. 3, a stack of fuel cells may be placed on a hydraulic press, where an end plate of the stack of fuel cells is in contact with a working table of the hydraulic press, and pressure is applied to a press cap of the stack through a hydraulic column of the hydraulic press.
It should be noted that the present application may also be implemented by placing the pile between two hydraulic presses and applying pressure to the press cap and the end plate of the pile by two hydraulic rods of the two hydraulic presses.
Further, referring to fig. 4, the second preset pressure increases with the number of repetitions N until the second preset pressure increases to a third preset pressure.
It should be noted that, the second preset pressure is set to be increased along with the increase of the repetition number N until the second preset pressure is increased to the third preset pressure, and the pressure applied to the press cap and the end plate of the electric pile is gradually increased, so that the electric pile is prevented from being damaged due to the fact that the pressure is suddenly increased too much.
Specifically, the second preset pressure increases with the number of repetitions N by increasing the fourth preset pressure.
It should be noted that, the second preset pressure increases the fourth preset pressure along with the increase of the repetition number N, so as to ensure that the fourth preset pressure with the same size is increased along with the increase of the repetition number N each time, and avoid the damage to the galvanic pile caused by the sudden and excessive increase of the pressure.
Preferably, the first preset pressure is increased to the second preset pressure in the third time period after the first preset time period, and the second preset pressure is reduced to the first preset pressure in the fourth time period after the second preset time period.
It should be noted that, when the first preset pressure increases to the second preset pressure, the pressure slowly increases in the third period, and when the second preset pressure decreases to the first preset pressure, the pressure slowly decreases in the fourth period, so that the damage to the galvanic pile caused by the sudden increase or decrease of the pressure too much can be avoided.
Specifically, the third preset time period is the same as the fourth preset time period.
It should be noted that, the time of the third preset time period and the fourth preset time period may be the same or different, and those skilled in the art may set the time of the third preset time period and the fourth preset time period according to the needs.
Further, the first preset time period is the same as the second preset time period.
It should be noted that the first preset time period and the second preset time period may be the same or different, and those skilled in the art may set the time of the first preset time period and the second preset time period according to the needs, but in the present application, it is preferable that the time of the first preset time period and the second preset time period be the same.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A fuel cell stack packaging method, comprising:
s1, repeatedly applying pressure to a press cap and an end plate of a fuel cell stack for N times according to a preset strategy, wherein the preset strategy is to continuously apply a first preset pressure to the press cap and the end plate, continuously increase the first preset pressure to a second preset pressure after a first preset time period, and reduce the second preset pressure to the first preset pressure after a second preset time period;
s2, after the first preset time period is continued, the first preset pressure is increased to the second preset pressure;
and S3, fastening the fuel cell stack.
2. The fuel cell stack packaging method according to claim 1, wherein the applying pressure to the press cap and the end plate of the fuel cell stack is repeated N times in a preset strategy, comprising:
and repeating the forward application of pressure to the press cap and the end plate of the fuel cell stack for N times according to a preset strategy.
3. The fuel cell stack packaging method according to claim 1, wherein the second preset pressure is incremented with an increase in the number of repetitions N until the second preset pressure is increased to a third preset pressure.
4. The fuel cell stack packaging method according to claim 3, wherein the second preset pressure is incremented by a fourth preset pressure as the number of repetitions N increases.
5. The fuel cell stack packaging method according to claim 1, wherein the first preset pressure is increased to a second preset pressure in a third period of time after a first preset period of time, and the second preset pressure is decreased to the first preset pressure in a fourth period of time after a second preset period of time.
6. The fuel cell stack packaging method according to claim 5, wherein the third preset time period is the same as the fourth preset time period.
7. The fuel cell stack packaging method according to claim 1, wherein the first preset time period is the same as the second preset time period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535717.2A CN114243076B (en) | 2021-12-15 | 2021-12-15 | Fuel cell stack packaging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535717.2A CN114243076B (en) | 2021-12-15 | 2021-12-15 | Fuel cell stack packaging method |
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| CN114243076A CN114243076A (en) | 2022-03-25 |
| CN114243076B true CN114243076B (en) | 2023-12-15 |
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| CN114243076A (en) | 2022-03-25 |
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