CN115084569B - Bipolar plate sealing structure and fuel cell - Google Patents
Bipolar plate sealing structure and fuel cell Download PDFInfo
- Publication number
- CN115084569B CN115084569B CN202210762817.7A CN202210762817A CN115084569B CN 115084569 B CN115084569 B CN 115084569B CN 202210762817 A CN202210762817 A CN 202210762817A CN 115084569 B CN115084569 B CN 115084569B
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- Prior art keywords
- plate
- bulge
- bipolar plate
- boss
- membrane electrode
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- 238000007789 sealing Methods 0.000 title claims abstract description 33
- 239000000446 fuel Substances 0.000 title claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 48
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000010008 shearing Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 229920001967 Metal rubber Polymers 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- 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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
- H01M8/1006—Corrugated, curved or wave-shaped MEA
Abstract
The invention discloses a bipolar plate sealing structure and a fuel cell, wherein the bipolar plate sealing structure comprises an anode plate, a cathode plate and a membrane electrode frame, the membrane electrode frame is arranged between the anode plate and the cathode plate, one of the anode plate and the cathode plate is of a planar structure, a first bulge is arranged on the planar structure along the circumferential direction of a cavity opening or a flow field area of the bipolar plate, a boss is arranged on the end surface of the other anode plate or the cathode plate far away from one end of the membrane electrode frame along the circumferential direction of the cavity opening or the flow field area of the bipolar plate, and second bulges which are respectively arranged on two sides of the boss and correspond to the first bulge are identical in shape, the bulge directions of the first bulge and the second bulge are identical, and the cavity opening or the flow field area of the bipolar plate is arranged in a space surrounded by the boss, the first bulge and the second bulge. The bipolar plate sealing structure can reduce the shearing stress between the bipolar plate and the membrane electrode frame, avoid the separation of the bipolar plate and the membrane electrode frame, reduce the shearing stress and avoid the sealing failure.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a bipolar plate sealing structure and a fuel cell.
Background
The fuel cell bipolar plate seal generally adopts a metal-rubber composite seal structure, which is mainly formed by stamping a metal plate material of a bipolar plate into an arched or trapezoidal protruding structure, and then arranging a seal element on the arched or trapezoidal protruding structure for enhancing the sealing performance of a sealing surface.
When the bipolar plates are stacked, the sealing elements are stacked to form a multi-layer structure at the same vertical direction, assembly force is loaded in the process of assembling the electric pile, all the bipolar plates and partial structures of the bipolar plates are compressed under the action of the assembly force, and after the sealing elements are compressed, shearing stress is generated between the bipolar plates and the membrane electrode frame due to deformation of the sealing elements, so that the bipolar plates are separated from the membrane electrode frame, and the sealing effect is invalid.
Therefore, how to provide a bipolar plate sealing structure, which can effectively reduce the shear stress and avoid the sealing failure is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Accordingly, the present invention is directed to a bipolar plate sealing structure, which can effectively reduce the shear stress and avoid the sealing failure.
It is yet another object of the present invention to provide a fuel cell.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the bipolar plate sealing structure comprises an anode plate, a cathode plate and a membrane electrode frame, wherein the membrane electrode frame is arranged between the anode plate and the cathode plate, one of the anode plate and the cathode plate is of a planar structure, a first bulge is arranged on the planar structure along the circumferential direction of a cavity opening or a flow field area of the bipolar plate, a boss is arranged on the end surface of the other anode plate or the cathode plate far away from one end of the membrane electrode frame along the cavity opening or the flow field area of the bipolar plate, and second bulges which are respectively arranged on two sides of the boss and correspond to the first bulge are respectively arranged, the shapes of the first bulge and the second bulge are the same, the bulge directions of the first bulge and the second bulge are the same, and the cavity opening or the flow field area of the bipolar plate is arranged in a space surrounded by the boss, the first bulge and the second bulge.
When a plurality of bipolar plates are assembled into a galvanic pile, the membrane electrode frame is arranged in a groove formed by the first bulge and the second bulge, the lower end face of the membrane electrode frame is in extrusion contact with the upper end face of the first bulge, and the upper end face of the membrane electrode frame is in extrusion contact with the upper end face of the second bulge so as to prevent media flowing out from a cavity opening or a flow field area of each bipolar plate from flowing out from a gap between two adjacent bipolar plates.
Preferably, the cross section of the boss is a trapezoid boss or the cross section of the boss is a rectangular boss.
Preferably, the first protrusion and the second protrusion are both semicircular structures.
Preferably, the first protrusion and the second protrusion are both in a trapezoid structure.
Preferably, the first protrusion and the second protrusion are both rectangular structures.
Preferably, the protruding direction of the first protrusion and the protruding direction of the second protrusion are the same as the protruding direction of the boss.
Preferably, the protruding direction of the first protrusion and the protruding direction of the second protrusion are opposite to the protruding direction of the boss.
Preferably, the height of the first protrusion and the second protrusion is 20% -80% of the height of the boss protrusion.
Preferably, the thicknesses of the anode plate and the cathode plate are the same, and the widths of the first bulge and the second bulge are 5-20 times of the thickness of the anode plate or the cathode plate.
A fuel cell comprising a bipolar plate seal arrangement according to any one of the preceding claims.
According to the technical scheme, in the mounting process of the bipolar plate and the membrane electrode, the membrane electrode frame is arranged in the groove formed by the first bulge and the second bulge, the lower end face of the membrane electrode frame is in extrusion contact with the upper end face of the first bulge under the extrusion action of the first bulge and the second bulge, the upper end face of the membrane electrode frame is in extrusion contact with the lower end face of the second bulge, and thus, effective sealing is formed between different bipolar plates, and medium flowing out from the cavity mouth or the flow field area of the bipolar plate can be prevented from flowing out from the gap between two adjacent bipolar plates. Compared with the prior art, the bipolar plate sealing structure disclosed by the embodiment of the invention can reduce the shearing stress between the bipolar plate and the membrane electrode frame, and avoid the separation of the bipolar plate and the membrane electrode frame, thereby reducing the shearing stress and avoiding the sealing failure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall structure of a bipolar plate sealing structure with a boss on an anode plate according to the first embodiment;
fig. 2 is a schematic cross-sectional view of a bipolar plate seal structure with a boss on an anode plate according to the first embodiment;
fig. 3 is a schematic cross-sectional view of a bipolar plate seal structure with a boss on an anode plate according to the first embodiment;
fig. 4 is a schematic cross-sectional structure of a bipolar plate with a boss on an anode plate and a frame of a membrane electrode according to the first embodiment;
FIG. 5 is a schematic cross-sectional view of a bipolar plate seal structure with bosses on the cathode plate as disclosed in the first embodiment;
FIG. 6 is a schematic cross-sectional view of a bipolar plate with bosses on the cathode plate and a frame of a membrane electrode according to the first embodiment;
fig. 7 is a schematic cross-sectional view of a bipolar plate seal structure with a boss on an anode plate according to a second embodiment;
fig. 8 is a schematic cross-sectional view of a bipolar plate with a boss on an anode plate and a frame of a membrane electrode according to a second embodiment;
FIG. 9 is a schematic cross-sectional view of a bipolar plate seal with bosses on the cathode plate according to the second embodiment;
fig. 10 is a schematic cross-sectional view of a bipolar plate with a boss on a cathode plate and a frame of a membrane electrode according to a second embodiment.
Wherein, each part name is as follows:
100 is an anode plate, 200 is a cathode plate, 300 is a membrane electrode frame, 400 is a boss, 500 is a first protrusion, and 600 is a second protrusion.
Detailed Description
Accordingly, the core of the present invention is to provide a bipolar plate sealing structure, which can effectively reduce the shear stress and avoid the sealing failure.
Another core of the present invention is also to provide a fuel cell.
For a better understanding of the present invention, reference is made to fig. 1 to 10, for a further detailed description of the present invention, taken in conjunction with the accompanying drawings and detailed description.
The bipolar plate sealing structure disclosed by the embodiment of the invention comprises an anode plate 100, a cathode plate 200 and a membrane electrode frame 300, wherein the membrane electrode frame 300 is arranged between the anode plate 100 and the cathode plate 200, one of the anode plate 100 or the cathode plate 200 is of a planar structure, a first protrusion 500 is arranged on the planar structure along the circumference of a cavity opening or a flow field area of the bipolar plate, an annular boss 400 is arranged on the end surface of the other anode plate 100 or the cathode plate 200 far away from one end of the membrane electrode frame 300 along the circumference of the cavity opening or the flow field area of the bipolar plate, and second protrusions 600 are respectively arranged on two sides of the boss 400 and correspond to the first protrusions 500, wherein the shapes of the first protrusions 500 and the second protrusions 600 are the same, the protruding directions of the first protrusions 500 and the second protrusions 600 are the same, and the cavity opening or the flow field area of the bipolar plate is arranged in a space surrounded by the annular boss 400, the first protrusions 500 and the second protrusions 600;
when a plurality of bipolar plates are assembled into a stack, the membrane electrode frame 300 is placed in the groove formed by the first protrusion 500 and the second protrusion 600, and the lower end surface of the membrane electrode frame 300 is in extrusion contact with the upper end surface of the first protrusion 500, and the upper end surface of the membrane electrode frame 300 is in extrusion contact with the lower end surface of the second protrusion 600, so as to prevent the medium flowing out from the cavity opening or the flow field region of the bipolar plate from flowing out from the gap between the adjacent two bipolar plates.
In the process of mounting the bipolar plate and the membrane electrode, the membrane electrode frame 300 is arranged in the groove formed by the first protrusion 500 and the second protrusion 600, the lower end face of the membrane electrode frame 300 is in extrusion contact with the upper end face of the first protrusion 500 under the extrusion action of the first protrusion 500 and the second protrusion 600, and the upper end face of the membrane electrode frame 300 is in extrusion contact with the lower end face of the second protrusion 600.
Compared with the prior art, the bipolar plate sealing structure disclosed by the embodiment of the invention can reduce the shearing stress between the bipolar plate and the membrane electrode frame 300, and avoid the separation of the bipolar plate and the membrane electrode frame 300, thereby reducing the shearing stress and avoiding the sealing failure.
It should be noted that, in the embodiment of the present invention, the upper end face of the membrane electrode frame 300 refers to the end face close to the boss 400, and the lower end face of the membrane electrode frame 300 refers to the end face far from the boss 500.
The specific structure of the boss 400 is not limited in this embodiment, and any structure meeting the requirements of the present invention is within the scope of the present invention.
As a preferred embodiment, the cross section of the boss 400 disclosed in the embodiment of the present invention is preferably a trapezoidal boss, or the cross section of the boss is preferably a rectangular boss.
More preferably, the cross section of the boss 400 disclosed in the embodiments of the present invention is preferably a trapezoidal boss.
The specific structures of the first protrusion 500 and the second protrusion 600 are not limited in the embodiments of the present invention, and all structures satisfying the use requirements of the present invention are within the scope of the present invention.
In order to optimize the above embodiments, the first protrusion 500 and the second protrusion 600 disclosed in the embodiments of the present invention are each in a semicircular structure.
As another preferred embodiment, the first protrusion 500 and the second protrusion 600 disclosed in the embodiment of the present invention are each preferably of a trapezoid-like structure.
As another preferred embodiment, the first protrusion 500 and the second protrusion 600 disclosed in the embodiment of the present invention are each preferably rectangular-shaped structures.
Of course, the first protrusion 500 and the second protrusion 600 disclosed in the embodiment of the present invention may have a W-type or V-type structure.
Referring to fig. 1 to 6, as a first embodiment of the present invention, the first protrusion 500 and the second protrusion 600 are disclosed as having the same protrusion direction as the protrusion direction of the boss 400.
Fig. 1 is a schematic diagram of the overall structure of a bipolar plate sealing structure with a boss on an anode plate according to the first embodiment; fig. 2 is a schematic cross-sectional view of a bipolar plate seal structure with a boss on an anode plate according to the first embodiment; fig. 3 is a schematic cross-sectional view of a bipolar plate seal structure with a boss on an anode plate according to the first embodiment; fig. 4 is a schematic cross-sectional structure of a bipolar plate with a boss on an anode plate and a frame of a membrane electrode according to the first embodiment; FIG. 5 is a schematic cross-sectional view of a bipolar plate seal structure with bosses on the cathode plate as disclosed in the first embodiment; fig. 6 is a schematic cross-sectional view of a bipolar plate with a boss on a cathode plate and a frame of a membrane electrode according to the first embodiment.
Referring to fig. 7 to 10, as a second embodiment of the present invention, the first protrusion 500 and the second protrusion 600 are disclosed to have opposite protruding directions to those of the boss 400.
Fig. 7 is a schematic cross-sectional structure of a bipolar plate sealing structure with a boss on an anode plate according to a second embodiment; fig. 8 is a schematic cross-sectional view of a bipolar plate with a boss on an anode plate and a frame of a membrane electrode according to a second embodiment; FIG. 9 is a schematic cross-sectional view of a bipolar plate seal with bosses on the cathode plate according to the second embodiment;
fig. 10 is a schematic cross-sectional view of a bipolar plate with a boss on a cathode plate and a frame of a membrane electrode according to a second embodiment.
The height and width of the first protrusion 500 and the second protrusion 600 are not particularly limited in the embodiment of the present invention, and all structures meeting the use requirements of the present invention are within the scope of the present invention.
As a preferred embodiment, the first protrusion 500 and the second protrusion 600 disclosed in the embodiment of the present invention each have a protrusion height of 20% -80% of the protrusion height of the boss 400.
Wherein, the thicknesses of the anode plate 100 and the cathode plate 200 are the same, and the widths of the first protrusions 500 and the second protrusions 600 disclosed in the embodiment of the present invention are 5-20 times the thickness of the anode plate 100 or the cathode plate 200.
The embodiment of the invention also discloses a fuel cell, which comprises the bipolar plate sealing structure disclosed in any embodiment.
Because the fuel cell adopts the bipolar plate sealing structure disclosed in the above embodiment, the fuel cell has the technical advantages of the bipolar plate sealing structure, and the embodiments of the present invention will not be described in detail.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 terms in this application will be understood by those of ordinary skill in the art in a specific context.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (10)
1. The bipolar plate sealing structure is characterized by comprising an anode plate, a cathode plate and a membrane electrode frame, wherein the membrane electrode frame is arranged between the anode plate and the cathode plate, one of the anode plate and the cathode plate is of a planar structure, a first bulge is arranged on the planar structure along the circumferential direction of a cavity opening or a flow field area of the bipolar plate, a boss is arranged on the end surface of the other anode plate or the cathode plate far away from one end of the membrane electrode frame along the cavity opening or the flow field area of the bipolar plate, and second bulges which are respectively arranged on two sides of the boss and correspond to the first bulge are of the same shape, the first bulge and the second bulge are of the same bulge direction, and the cavity opening or the flow field area of the bipolar plate is arranged in a space surrounded by the boss, the first bulge and the second bulge.
When a plurality of bipolar plates are assembled into a galvanic pile, the membrane electrode frame is arranged in a groove formed by the first bulge and the second bulge, the lower end face of the membrane electrode frame is in extrusion contact with the upper end face of the first bulge, and the upper end face of the membrane electrode frame is in extrusion contact with the upper end face of the second bulge so as to prevent media flowing out from a cavity opening or a flow field area of each bipolar plate from flowing out from a gap between two adjacent bipolar plates.
2. The bipolar plate seal arrangement of claim 1 wherein the cross-section of the boss is a trapezoidal boss or the cross-section of the boss is a rectangular boss.
3. The bipolar plate seal arrangement of claim 1 wherein said first protrusion and said second protrusion are each semi-circular in configuration.
4. The bipolar plate seal arrangement of claim 1 wherein said first projection and said second projection are each of a trapezoidal configuration.
5. The bipolar plate seal arrangement of claim 1 wherein said first projection and said second projection are each rectangular structures.
6. The bipolar plate seal arrangement of claim 1 wherein the first and second projections each have a projection direction that is the same as the projection direction of the boss.
7. The bipolar plate seal arrangement of claim 1 wherein the first and second projections each have a projection direction opposite to the projection direction of the boss.
8. The bipolar plate seal arrangement of claim 1 wherein the first and second protrusions each have a protrusion height that is 20% -80% of the protrusion height of the boss.
9. The bipolar plate seal arrangement of claim 1 wherein said anode plate and said cathode plate have the same thickness, and wherein said first projection and said second projection each have a width that is 5-20 times the thickness of either the anode plate or the cathode plate.
10. A fuel cell comprising the bipolar plate seal structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762817.7A CN115084569B (en) | 2022-06-30 | 2022-06-30 | Bipolar plate sealing structure and fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762817.7A CN115084569B (en) | 2022-06-30 | 2022-06-30 | Bipolar plate sealing structure and fuel cell |
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| Publication Number | Publication Date |
|---|---|
| CN115084569A CN115084569A (en) | 2022-09-20 |
| CN115084569B true CN115084569B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210762817.7A Active CN115084569B (en) | 2022-06-30 | 2022-06-30 | Bipolar plate sealing structure and fuel cell |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115441024B (en) * | 2022-10-17 | 2024-03-26 | 上海氢晨新能源科技有限公司 | Fuel cell stack and fuel cell |
| CN116613341B (en) * | 2023-07-17 | 2023-10-31 | 上海治臻新能源股份有限公司 | Fuel cell |
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|---|---|
| CN115084569A (en) | 2022-09-20 |
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