CN216354317U - Fuel cell with rubber line-frame sealing element structure - Google Patents
Fuel cell with rubber line-frame sealing element structure Download PDFInfo
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- CN216354317U CN216354317U CN202122572913.9U CN202122572913U CN216354317U CN 216354317 U CN216354317 U CN 216354317U CN 202122572913 U CN202122572913 U CN 202122572913U CN 216354317 U CN216354317 U CN 216354317U
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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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Abstract
The utility model provides a fuel cell with a glue line-frame sealing element structure, which comprises a membrane electrode and bipolar plates arranged at two sides of the membrane electrode; a glue line-frame sealing element is also arranged between the membrane electrode and the bipolar plate; the glue line-frame sealing element is provided with a middle channel and a plurality of communicating holes surrounding the middle channel; a first sealing rubber line and a second sealing rubber line are respectively arranged on two sides of the rubber line-frame sealing element; the first sealant line and the second sealant line are connected through the communication hole. By arranging the glue line-frame sealing element between the bipolar plate and the membrane electrode, the damage of the membrane electrode and the bipolar plate, which is possibly caused by directly injecting the sealing glue line on the membrane electrode or the bipolar plate, is avoided, and when one of the membrane electrode, the bipolar plate and the glue line-frame sealing element has a problem, the defective part can be independently replaced for repair, so that the repair cost of the fuel cell is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of sealing in fuel cells and cell stacks, in particular to a fuel cell with a glue line-frame sealing element structure.
Background
Fuel cells are on-line power generation devices that convert chemical energy into electrical energy, and fuel cell engines are considered to be the most important direction in the future for the development of automotive power plants due to the breakthrough of efficiency limitations of conventional internal combustion engines. Taking a Proton Exchange Membrane Fuel Cell (PEMFC) as an example, a fuel cell stack is formed by stacking a plurality of single cells, a gas source enters each single cell through a fuel inlet of the stack, passes through a specified sealed flow channel in the cell and participates in a reaction, and residual gas flows out of the stack from an outlet of the stack. The sealing of the stack is critical to ensure proper operation of the stack. Poor or failed sealing of the stack can lead to reduced performance of the stack, damage to internal components of the stack, and even explosion, resulting in safety accidents. In a hydrogen fuel cell, three-cavity fluids are generally sealed in the form of sealant lines or screen printing; the screen printing process is only suitable for the internal fitting of the graphite bipolar plate and the sealing of the cooling flow channel, and the sealing between reactant gas and the membrane electrode generally adopts a sealing rubber line.
At present, in the practical assembly application of the fuel cell stack, there are various molding manners of the sealant line, such as a form of dispensing and curing UV glue in the sealant line groove of the bipolar plate, a form of customizing the sealant line by a mold molding manner, a form of injection molding or glue injection molding on the bipolar plate, and a form of compression molding of silica gel on the frame of the membrane electrode. However, the above molding method of the sealant lines is easy to damage core components such as membrane electrodes or bipolar plates, and affects the performance of the whole cell stack; moreover, when the fuel cell is poorly sealed due to the problem of the sealing rubber line, the bipolar plate or the membrane electrode needs to be replaced integrally, the operation is complex, the cost is high, and the optimization and the upgrade of the fuel cell are not facilitated.
SUMMERY OF THE UTILITY MODEL
Based on the structure, the utility model provides a fuel cell with a glue line-frame sealing element structure, aiming at solving the problem that the existing sealing glue line forming mode is easy to damage core components such as a membrane electrode, a bipolar plate and the like, and influences the performance of the whole cell stack; moreover, when the fuel cell is not sealed well due to the problem of the seal gum line, the bipolar plate or the membrane electrode needs to be replaced as a whole, which causes the problems of complicated operation and high cost.
In order to achieve the purpose, the utility model provides the following technical scheme:
the application provides a fuel cell with a glue line-frame sealing element structure, which comprises a membrane electrode and bipolar plates arranged on two sides of the membrane electrode; a glue line-frame sealing element is also arranged between the membrane electrode and the bipolar plate; the glue line-frame sealing element is provided with a middle channel and a plurality of communicating holes surrounding the middle channel; a first sealing rubber line is arranged on one side, close to the membrane electrode, of the rubber line-frame sealing element, and a second sealing rubber line is arranged on one side, close to the bipolar plate, of the rubber line-frame sealing element; the first sealant line and the second sealant line are connected through the communication hole.
Further, the first sealing glue line and the second sealing glue line are glue lines integrally formed through glue injection.
Further, the width of the first sealant line is the same as that of the second sealant line; the thickness of the first sealant line is smaller than that of the second sealant line.
Further, the thickness of the second sealant line is 2-5 times that of the first sealant line.
Further, the middle channel is arranged opposite to the carbonaceous region of the membrane electrode; the area of the middle channel is larger than the area of the carbonaceous region of the membrane electrode.
Further, the maximum size of the cross section of the communication hole is smaller than or equal to the width of the first sealant line.
Further, the center distance between two adjacent communication holes is 1.5-3 times of the maximum size of the cross section of the communication hole. Therefore, the stability of the first sealing rubber wire and the second sealing rubber wire after the first sealing rubber wire and the second sealing rubber wire are connected through the communication hole can be guaranteed.
Further, the communication holes are round through holes, square through holes, triangular through holes, oval through holes or other special-shaped through holes.
Furthermore, a glue line groove matched with the second sealing glue line is also arranged on the bipolar plate.
Furthermore, two ends of the glue line-frame sealing element are also provided with three cavity fluid channels matched with the membrane electrodes.
Further, the frame of the glue line-frame sealing element is a hard frame.
According to the fuel cell with the glue line-frame sealing element structure, the glue line-frame sealing element structure is arranged between the bipolar plate and the membrane electrode, so that the risk that the membrane electrode or the bipolar plate is possibly damaged due to the fact that the sealing element is formed on the membrane electrode or the bipolar plate through glue injection molding is avoided, and the sealing performance between the membrane electrode and the bipolar plate can be guaranteed. By arranging the sealing rubber wire on the rubber wire-frame sealing element, when the rubber wire-frame sealing element, the membrane electrode or the bipolar plate has problems, compared with the prior art that the membrane electrode or the bipolar plate which is injected with rubber needs to be integrally replaced, the utility model can repair the rubber wire-frame sealing element, the membrane electrode or the bipolar plate which has problems by replacing the rubber wire-frame sealing element, the membrane electrode or the bipolar plate which has problems independently, thereby greatly reducing the repair cost of the fuel cell. The utility model has simple process and manufacture, easy assembly, excellent sealing effect, low cost and strong practicability, and is particularly suitable for batch production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is an exploded view of a fuel cell having a glue line-frame seal configuration in accordance with an embodiment of the present invention;
FIG. 2 is a perspective view of the glue line-to-border seal of FIG. 1;
FIG. 3 is a top view of the glue line-to-border seal of FIG. 1 (including the first sealing glue line);
FIG. 4 is a bottom view of the glue line-to-rim seal of FIG. 1 (with a second sealing glue line);
fig. 5 is a partial view of a cross-sectional view taken along line a-a of fig. 3.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The sealing of the fuel cell stack is important, and poor sealing or sealing failure can cause the performance of the fuel cell stack to be reduced, damage to internal components of the fuel cell stack and even cause explosion, thereby causing safety accidents. At present, in the practical assembly application of the fuel cell stack, there are various molding manners of the sealant line, such as a form of dispensing and curing UV glue in the sealant line groove of the bipolar plate, a form of customizing the sealant line by a mold molding manner, a form of injection molding or glue injection molding on the bipolar plate, and a form of compression molding of silica gel on the frame of the membrane electrode. However, in the form of dispensing UV glue in the glue line groove, due to the inherent characteristics of dispensing, the shape of the formed glue line sealing surface is oval, and the situation that the glue lines on the two sides of the frame of the membrane electrode are dislocated during assembly can occur in the shape, so that gas leakage occurs in the operation process of the cell stack; the glue line which is independently injected and molded by adopting the mold is very complicated in assembly, is only suitable for the development stage of the cell stack prototype and is not suitable for batch production; the glue lines formed by injection molding on the bipolar plate and the glue lines formed by compression molding of silica gel on the frame of the membrane electrode have high manufacturing process requirements and high cost, and the bipolar plate or the membrane electrode is possibly damaged in the forming process of the glue lines, so that subsequent stacking and performance testing are influenced. Moreover, the existing sealing rubber line forming mode is easy to damage the membrane electrode, and the performance of the membrane electrode is influenced; when the fuel cell is sealed badly due to the sealing rubber line, the bipolar plate or the membrane electrode needs to be replaced integrally, the operation is complex, the cost is high, and the optimization and the upgrade of the fuel cell are not facilitated. In order to solve the above technical problems, the present invention provides a fuel cell having a glue line-frame sealing structure.
As shown in fig. 1 to 4, a fuel cell with a glue line-frame sealing structure according to an embodiment of the present application includes a membrane electrode 1, and bipolar plates 2 disposed on two sides of the membrane electrode 1; a glue line-frame sealing member 3 is also arranged between the membrane electrode 1 and the bipolar plate 2; the glue line-frame sealing member 3 is provided with a middle channel 31 and a plurality of communicating holes 32 surrounding the middle channel 31; a first sealing glue line 4 is arranged on one side of the glue line-frame sealing element 3 close to the membrane electrode 1, and a second sealing glue line 5 is arranged on one side of the glue line-frame sealing element 3 close to the bipolar plate 2; the first sealant line 4 and the second sealant line 5 are connected by the communication hole 32. In the embodiment of the application, the sealing glue lines are fixed on the two sides of the glue line-frame sealing element 3, and the communication holes 32 are arranged on the glue line-frame sealing element 3 to connect the sealing glue lines on the two sides, so that the sealing glue lines can be more stably fixed on the glue line-frame sealing element 3, and the sealing between the bipolar plate 2 and the membrane electrode 1 is facilitated; moreover, the sealing glue line is arranged on the glue line-frame sealing element 3, thereby avoiding the damage of the membrane electrode 1 and the bipolar plate 2 which is possibly caused by directly injecting the sealing glue line on the membrane electrode 1 or the bipolar plate 2, and when one of the membrane electrode 1, the bipolar plate 2 and the glue line-frame sealing element 3 has a problem, the sealing glue line can be independently replaced without being replaced simultaneously.
Referring to fig. 5, in the embodiment of the present application, the first sealant line 4 and the second sealant line 5 are integrally formed by injecting glue. The first sealing glue line 4 and the second sealing glue line 5 are integrally formed by injecting glue through a mould, and are connected through the communication holes 32 and fixed on two sides of the glue line-frame sealing element 3, so that the risk that the sealing glue lines are dislocated or fall in the assembling process can be effectively avoided, and the sealing performance of the fuel cell is effectively guaranteed.
In the embodiment of the present application, the width of the first sealant line 4 is the same as the width of the second sealant line 5; the thickness of the first sealant line 4 is smaller than that of the second sealant line 5. Since the first sealant line 4 corresponds to the membrane electrode 1 and the second sealant line 5 corresponds to the bipolar plate 2, in consideration of possible damage caused by the fact that the sealant line-frame sealing member 3 cannot collide with the carbonaceous region of the membrane electrode 1, and in consideration of the depth of the sealant line groove reserved on the bipolar plate 2 and the compactness of the mutual cooperation of the three, in the embodiment of the present application, the thicknesses of the first sealant line 4 and the second sealant line 5 need to be precisely controlled during sealant injection.
In the embodiment of the present application, the thickness of the second sealant line 5 is 2 times to 5 times the thickness of the first sealant line 4.
Referring again to fig. 2, in the present embodiment, the central channel 31 is disposed opposite to the carbonaceous region of the membrane electrode 1; the area of the central channel 31 is larger than the area of the carbonaceous region of the membrane electrode 1. To ensure that the glue line-frame seal 3 does not affect the direct contact between the membrane electrode 1 and the bipolar plate 2, the area of the central channel 31 on the glue line-frame seal 3 needs to be larger than the area of the carbonaceous region of the membrane electrode 1, thereby ensuring the performance of the fuel cell.
In the embodiment of the present application, the maximum size of the cross section of the communication hole 32 is less than or equal to the width of the first sealant line 4, so that the sealant lines on both sides of the sealant line-frame sealing member 3 can completely block the communication hole 32, and prevent the reactant from leaking out of the communication hole 32, thereby better ensuring the sealing performance of the fuel cell. In the embodiment of the present application, the first sealant line 4 and the second sealant line 5 are both in a strip structure, and therefore, the width of the first sealant line 4 and the width of the second sealant line 5 refer to the width of the strip structure.
In the embodiment of the present application, the center distance between two adjacent communication holes 32 is 1.5 times to 3 times the maximum dimension of the cross section of the communication hole 32. This ensures the stability of the first sealant line 4 and the second sealant line 5 after they are connected through the communication hole 32.
In the embodiment of the present application, the communication hole 32 is a circular through hole, a square through hole, a triangular through hole, an oval through hole, or another irregular through hole, specifically a circular through hole.
In the embodiment of the present application, a glue line groove (not labeled) adapted to the second sealing glue line 4 is further disposed on the bipolar plate 2.
Referring again to fig. 2, in the embodiment of the present application, two ends of the glue line-frame sealing member 3 are further provided with three-cavity fluid channels 33 adapted to the membrane electrode 1. The three-chamber fluid passage 33 in the embodiment of the present application refers to a fuel passage, a cooling water passage, and an oxidizer passage; the fuel channel comprises a fuel inlet and a fuel outlet; the cooling water channel comprises a cooling water inlet and a cooling water outlet; the oxidant passage comprises an oxidant inlet and an oxidant outlet; wherein, the fuel inlet, the cooling water inlet and the oxidant outlet are arranged at one end of the glue line-frame sealing element; the fuel outlet, the cooling water outlet and the oxidant inlet are arranged at the other end of the glue line-frame sealing element. The fuel channel, the cooling water channel and the oxidant channel are respectively communicated with corresponding channels on the membrane electrode 1, and simultaneously the fuel channel, the cooling water channel and the oxidant channel are also respectively communicated with corresponding channels on the bipolar plate 2.
In the present embodiment, in order to ensure the sealing performance among the membrane electrode 1, the bipolar plate 2 and the glue line-frame sealing member 3, the first sealant line 4 is disposed around the inlet/outlet and the middle channel 31 of the three-cavity fluid channel 33 on one side of the glue line-frame sealing member 3, and the second sealant line 5 is disposed around the inlet/outlet and the middle channel 31 of the three-cavity fluid channel 33 on the other side of the glue line-frame sealing member 3.
In the embodiment of the present application, the glue line-frame sealing member 3 is a hard frame, and the hard frame has a certain rigidity, which is beneficial to assembly and does not affect the performance of the assembled fuel cell.
In the present embodiment, the maximum size of the communication hole 32 is: when the communication hole 32 is a circular through hole, the maximum size of the cross section of the communication hole 32 is the diameter of the circular through hole; when the communication hole 32 is a square through hole or a triangular through hole, the maximum size of the cross section of the communication hole 32 is the diameter of the circumscribed circle of the square through hole and the diameter of the circumscribed circle of the triangular through hole; when the communication hole 32 is an elliptical through hole, the maximum size of the cross section of the communication hole 32 is the major diameter of the elliptical through hole; and if the through hole is the other special-shaped through hole, the measurable maximum dimension of the cross section of the special-shaped through hole is obtained.
According to the fuel cell with the glue line-frame sealing element structure, the glue line-frame sealing element 3 is arranged between the bipolar plate 2 and the membrane electrode 1, so that damage to the membrane electrode 1 and the bipolar plate 2 caused by directly injecting a sealing glue line on the membrane electrode 1 or the bipolar plate 2 is avoided, and the sealing performance between the membrane electrode 1 and the bipolar plate 2 can be ensured. By arranging the sealing rubber lines on the rubber line-frame sealing element 3, when the rubber line-frame sealing element 3, the membrane electrode 1 or the bipolar plate 2 have problems, compared with the prior art that the membrane electrode 1 or the bipolar plate 2 which is injected with rubber needs to be integrally replaced, the utility model can be repaired by independently replacing the rubber line-frame sealing element 3, the membrane electrode 1 or the bipolar plate 2 which have problems, thereby greatly reducing the repair cost of the fuel cell. The utility model has simple process and manufacture, easy assembly, excellent sealing effect, low cost and strong practicability, and is particularly suitable for batch production.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fuel cell with a glue line-frame sealing element structure is characterized by comprising a membrane electrode and bipolar plates arranged at two sides of the membrane electrode; a glue line-frame sealing element is also arranged between the membrane electrode and the bipolar plate; the glue line-frame sealing element is provided with a middle channel and a plurality of communicating holes surrounding the middle channel; a first sealing rubber line is arranged on one side, close to the membrane electrode, of the rubber line-frame sealing element, and a second sealing rubber line is arranged on one side, close to the bipolar plate, of the rubber line-frame sealing element; the first sealant line and the second sealant line are connected through the communication hole.
2. The fuel cell having the glue line-frame seal structure of claim 1, wherein the first and second sealing glue lines are glue lines integrally formed by glue injection.
3. The fuel cell having a glue line-frame seal arrangement of claim 1, wherein the width of said first sealant line is the same as the width of said second sealant line; the thickness of the first sealant line is smaller than that of the second sealant line.
4. The fuel cell having a glue line-frame seal arrangement of claim 1, wherein said second sealant glue line thickness is 2-5 times greater than said first sealant glue line thickness.
5. The fuel cell having a glue line-and-frame seal configuration of claim 1, wherein said central channel is disposed opposite a carbonaceous region of said membrane electrode; the area of the middle channel is larger than the area of the carbonaceous region of the membrane electrode.
6. The fuel cell having the seal structure of claim 1, wherein a maximum dimension of a cross section of the communication hole is less than or equal to a width of the first seal bead.
7. The fuel cell having the glue line-frame seal structure according to claim 1, wherein a center distance between adjacent two of the communication holes is 1.5 to 3 times a maximum dimension of a cross section of the communication hole.
8. The fuel cell having the glue line-frame seal structure according to claim 1, wherein the communication hole is a circular through hole, a square through hole, a triangular through hole, an oval through hole, or other irregular through holes.
9. The fuel cell with the glue line-frame seal structure of claim 1, wherein the bipolar plate is further provided with a glue line groove adapted to the second sealing glue line.
10. The fuel cell having the structure of the glue line-frame seal according to claim 1, wherein the glue line-frame seal is further provided with three-cavity fluid channels at both ends thereof to be fitted to the membrane electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122572913.9U CN216354317U (en) | 2021-10-25 | 2021-10-25 | Fuel cell with rubber line-frame sealing element structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122572913.9U CN216354317U (en) | 2021-10-25 | 2021-10-25 | Fuel cell with rubber line-frame sealing element structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216354317U true CN216354317U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122572913.9U Active CN216354317U (en) | 2021-10-25 | 2021-10-25 | Fuel cell with rubber line-frame sealing element structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216354317U (en) |
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2021
- 2021-10-25 CN CN202122572913.9U patent/CN216354317U/en active Active
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