CN215527767U - Assembly structure of membrane electrode and bipolar plate and electric pile comprising assembly structure - Google Patents
Assembly structure of membrane electrode and bipolar plate and electric pile comprising assembly structure Download PDFInfo
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- CN215527767U CN215527767U CN202121466447.XU CN202121466447U CN215527767U CN 215527767 U CN215527767 U CN 215527767U CN 202121466447 U CN202121466447 U CN 202121466447U CN 215527767 U CN215527767 U CN 215527767U
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- membrane electrode
- bipolar plate
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- adhesive layer
- elastic adhesive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The utility model relates to the field of fuel cells, in particular to an assembly structure of a membrane electrode and a bipolar plate, which comprises a membrane electrode, the bipolar plate and a sealing layer, wherein sealing grooves are formed in two surfaces of the bipolar plate, the sealing layer comprises a sealing ring and an elastic adhesive layer, the sealing ring is arranged in the sealing groove, the elastic adhesive layer covers the sealing ring and the bipolar plate, one surface of the bipolar plate is assembled and connected with one surface of the membrane electrode through the sealing ring and the elastic adhesive layer, and the elastic adhesive layer fills gaps at the joint of the membrane electrode and the bipolar plate. The utility model improves the original sealing layer, effectively improves the sealing effect between the membrane electrode and the bipolar plate, ensures that the fuel cell can isolate air from hydrogen in the operation process, avoids gas mixing of a cathode and an anode in the fuel cell, further improves the performance and the service life of the fuel cell and reduces the use cost. The utility model also discloses a galvanic pile comprising the assembly structure.
Description
Technical Field
The utility model relates to the field of fuel cells, in particular to an assembly structure of a membrane electrode and a bipolar plate and an electric stack comprising the same.
Background
A proton exchange membrane fuel cell is a type of fuel cell in which hydrogen and oxygen electrochemically react to produce water, producing electrical energy. The smallest unit of parts for accomplishing electrochemical reactions in a pem fuel cell is called a single cell, and consists of an anode plate, a Membrane Electrode (MEA), and a cathode plate, and an integrated component formed by repeatedly stacking single cells is called a fuel cell stack. In the cell, the membrane electrode and the bipolar plate are sealed by a sealing ring, so that the leakage of the gas of the cathode and the anode of the fuel cell is blocked. In the prior art, the sealing ring between the membrane electrode and the bipolar plate is sealed by a sealing rubber strip processed by a sealing gum, when the membrane electrode and the bipolar plate are assembled, the sealing rubber strip is firstly embedded into a groove of the bipolar plate and then is assembled with the membrane electrode, but the efficiency of assembling the galvanic pile is low, and the galvanic pile is not suitable for large-scale production. Therefore, a new sealing method is also provided at present to improve the assembly efficiency, the sealing method is to form a sealing ring in the groove by the method of glue dispensing and curing or injection molding of the sealing glue on the bipolar plate to obtain a glued bipolar plate, and then the glued bipolar plate and the membrane electrode are assembled into a stack. However, since the frame of the membrane electrode is generally made of a flexible polymer plastic film, and the bipolar plate substrate is generally made of a rigid material, in the processing process, no matter which assembling method is adopted, a fine gap may exist at the sealing position due to the existence of fine unevenness between the surface of the bipolar plate and the membrane electrode, and the sealing ring can only be matched with the sealing groove to seal the bipolar plate and the membrane electrode, but cannot seal the fine gap formed at the unevenness, so that hydrogen and air may leak out from the fuel cell during the use process, and the performance and the service life of the fuel cell stack are affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome at least one defect (deficiency) of the prior art, and provides an assembly structure of a membrane electrode and a bipolar plate and a galvanic pile comprising the same.
The utility model adopts the technical scheme that an assembly structure of a membrane electrode and a bipolar plate is provided, which comprises a membrane electrode, the bipolar plate and a sealing layer, wherein two sides of the bipolar plate are respectively provided with a sealing groove, the sealing layer comprises a sealing ring and an elastic adhesive layer, the sealing ring is arranged in the sealing groove, the elastic adhesive layer covers the sealing ring and the bipolar plate, one side of the bipolar plate is assembled and connected with one side of the membrane electrode through the sealing ring and the elastic adhesive layer, and the elastic adhesive layer fills a gap at the joint of the membrane electrode and the bipolar plate.
In the prior art, only the seal ring is used for sealing between the bipolar plate and the membrane electrode, and in the technical scheme, the seal ring is adopted, and the elastic adhesive layer is additionally arranged on the basis of the seal ring, and can permeate into a gap between the bipolar plate and the membrane electrode to be filled during sealing, so that the sealing effect is improved, the gas of a cathode and an anode of the fuel cell is prevented from leaking through the gap in the operation process, the performance and the service life of the fuel cell are improved, and the use cost can be reduced.
Further, the membrane electrode comprises a membrane electrode frame and a membrane electrode body, the membrane electrode body is arranged in the membrane electrode frame, the membrane electrode body comprises an anode diffusion layer, an anode catalysis layer, a proton exchange membrane, a cathode catalysis layer and a cathode diffusion layer which are sequentially stacked, and the membrane electrode frame is assembled and connected with the bipolar plate through the sealing ring and the elastic adhesive layer. The membrane electrode body is of a five-layer structure and is used for generating oxidation-reduction reaction to generate electrons to form current, and the membrane electrode frame is used for being assembled with the bipolar plate and can effectively support the protective membrane electrode body.
Further, the thickness of the elastic adhesive layer is 1-10 mu m, and/or the width of the elastic adhesive layer is 0.1-2.0 mm larger than the width of the sealing groove.
Although the elastic adhesive layer can fill the gap at the joint of the membrane electrode and the bipolar plate, if the thickness of the elastic adhesive layer is too thick, the distance between the bipolar plate and the membrane electrode is too large, the transmission of gas in a flow channel is changed, and the reaction gas is influenced to participate in the electrochemical reaction, so that in the technical scheme, the thickness of the elastic adhesive layer is controlled, the elastic adhesive layer can be squeezed by the bipolar plate and the frame of the membrane electrode to permeate into the gap for filling and sealing, and a small distance can be kept between the bipolar plate and the membrane electrode, so that the reaction is fully performed, and the fuel cell is ensured to have higher conversion efficiency; the width of the elastic adhesive layer is controlled, so that the elastic adhesive layer can just cover the sealing ring and the groove, the elastic adhesive layer can be ensured to completely fill the gap at the sealing position, excessive materials can be avoided, and the cost is saved.
Further, the material of the elastic adhesive layer is organic silicon polymer, polyurethane, polyolefin, epoxy resin polymer, polyacrylate or polymethacrylate.
In the technical scheme, the adopted materials have elasticity and viscosity, can play a role in pasting and filling gaps when being applied to sealing positions, have certain high temperature resistance and moisture resistance, are less influenced by high temperature and humidity generated during the operation of the fuel cell, and can ensure the service life of the fuel cell.
Further, the sealing ring is a sealing rubber strip arranged in the sealing groove, or a sealing rubber layer formed after glue is dispensed in the sealing groove and cured or injection-molded and hardened, or a sealing rubber layer formed after glue is dispensed on the elastic adhesive layer and cured. The sealing ring is manufactured by the prior art, so that only one process for coating the elastic adhesive layer is needed, the prior production line is not required to be excessively modified, a sealing adhesive tape or a sealing adhesive layer can be arranged in the sealing groove to serve as the sealing ring during processing, the elastic adhesive layer can be arranged on the frame of the membrane electrode, then the sealing adhesive layer is arranged by spot-coating adhesive, and then the sealing adhesive layer is assembled with the bipolar plate, the assembling efficiency is high, the production cost can be reduced, and the popularization and the use of the product are facilitated.
Further, the sealing ring is higher than the sealing groove by 0.1-3.0 mm.
In the technical scheme, the sealing ring is used for sealing the sealing position, and the elastic adhesive layer can seal and fill possible gaps of the sealing position, so that the sealing ring is set to be higher than the sealing groove by a certain height, the bipolar plate and the membrane electrode can be guaranteed to extrude the sealing ring to realize sealing in assembly, the elastic adhesive layer can be extruded into the gap, and the elastic adhesive layer and the membrane electrode are matched to realize better sealing effect.
Furthermore, through holes are arranged at two ends of the bipolar plate, the sealing grooves are arranged around the through holes, and the through holes are correspondingly arranged on the frame of the membrane electrode, so that the through holes of the frame of the membrane electrode are opposite to the through holes of the bipolar plate and have the same size after the membrane electrode and the bipolar plate are assembled.
In the technical scheme, the through holes with opposite positions and the same size are arranged at the two ends of the bipolar plate and the frame of the membrane electrode, so that the arrangement of the sealing grooves is facilitated, the fasteners can be conveniently arranged to fix a plurality of assembly structures to form a galvanic pile, and the through holes provide a plurality of channels in the fuel cell to respectively introduce hydrogen, oxygen and cooling liquid so as to smoothly carry out the reaction in the fuel cell.
Preferably, the material of the membrane electrode frame is PI, PET, PEEK, PPS or PEN, and/or the material of the bipolar plate is carbon, flexible graphite, titanium or stainless steel.
The utility model also provides a galvanic pile which comprises a plurality of the membrane electrode and bipolar plate assembly structures which are sequentially stacked, current collecting plates, end plates and fasteners, wherein the current collecting plates are positioned at the upper side and the lower side of the stacked assembly structures, and the end plates are positioned at one side of the current collecting plates, which is far away from the assembly structures; the fasteners are used for connecting and fixing the end plates so as to fasten a plurality of stacked assembly structures.
In the technical scheme, a plurality of assembly structures of the membrane electrode and the bipolar plate are stacked in series; the current collecting plate is used for conveying electric energy generated by the galvanic pile to an external load; the end plates are used for providing enough contact pressure to the stacked assembly structure to transfer packaging load to the bipolar plates and the membrane electrode frame so as to press the sealing layers to realize sealing; the fastener is used for fastening the end plate, maintains the contact pressure of each assembly structure and ensures the sealing effect.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the elastic adhesive layer is additionally arranged at the sealing position between the bipolar plate and the membrane electrode, so that a fine gap between the bipolar plate and the membrane electrode can be filled during sealing, and the gas of a cathode and an anode in the operation process of the fuel cell is prevented from leaking through the fine gap, so that the performance and the service life of the membrane electrode are improved;
(2) the thickness and the width of the elastic adhesive layer are controlled, so that the elastic adhesive layer can just cover the sealing ring and the groove, the sealing gap of the elastic adhesive layer can be ensured, and the phenomenon that the reaction of the membrane electrode is influenced due to the overlarge distance between the bipolar plate and the membrane electrode can be avoided;
(3) the galvanic pile of the utility model adopts an assembly structure with better sealing performance and has higher conversion efficiency.
Drawings
Fig. 1 is a schematic structural view of an assembly structure of a membrane electrode and a bipolar plate.
Fig. 2 is a schematic structural view of a membrane electrode.
Fig. 3 is a schematic structural view of the membrane electrode and the elastic adhesive layer.
Fig. 4 is a schematic structural view of a bipolar plate.
Fig. 5 is a schematic structural view of a bipolar plate and a seal ring.
In the drawings are labeled: a bipolar plate 100; a sealing groove 110; a bipolar plate through-hole 120; a membrane electrode 200; a membrane electrode frame 210; a frame through hole 211; a membrane electrode body 220; a seal ring 310; an elastic adhesive layer 320.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the utility model. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, the present embodiment provides an assembly structure of a membrane electrode and a bipolar plate, including a membrane electrode 200, a bipolar plate 100, and a sealing layer. The bipolar plate 100 is provided with sealing grooves 110 on both sides, the sealing layer includes a sealing ring 310 and an elastic adhesive layer 320, the sealing ring 310 is disposed in the sealing groove 110, the elastic adhesive layer 320 covers the sealing ring 310 and the bipolar plate 100, in this embodiment, the number of the bipolar plate 100 is two, one side of one bipolar plate 100 is assembled and connected with one side of the membrane electrode 200 through the sealing ring 310 and the elastic adhesive layer 320, and one side of the other bipolar plate 100 is also assembled and connected with the other side of the membrane electrode 200 through the sealing ring 310 and the elastic adhesive layer 320.
As shown in fig. 2 and fig. 3, the membrane electrode 200 includes a membrane electrode frame 210 and a membrane electrode body 220, the membrane electrode body 220 is disposed in the membrane electrode frame 210, the membrane electrode body 220 has a five-layer structure, and includes an anode diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer, and a cathode diffusion layer, which are sequentially stacked, the membrane electrode frame 210 is made of one or more of PI, PET, PEEK, PPS, and PEN, and the membrane electrode frame 210 is used for assembling and connecting with the bipolar plate 100, and is assembled and connected with the bipolar plate through the sealing ring 310 and the elastic adhesive layer 320 to effectively support the membrane electrode body 220.
In this embodiment, the bipolar plate 100 is made of carbon, flexible graphite, titanium or stainless steel, as shown in fig. 4 and 5, bipolar plate through holes 120 are formed at two ends of the bipolar plate 100, the sealing grooves 110 are formed around the bipolar plate through holes 120, and the frame through holes 211 are formed at positions of the membrane electrode frame 210 corresponding to the bipolar plate through holes 120, so that the frame through holes are opposite to the bipolar plate through holes 120 and have the same size after the membrane electrode 200 and the bipolar plate 100 are assembled, the bipolar plate through holes 120 and the frame through holes 211 can provide multiple channels in the fuel cell to introduce hydrogen, oxygen and coolant respectively, and the arrangement of the through holes is favorable for the arrangement of the sealing grooves 110, and a fastener can be conveniently arranged to fix a plurality of assembled structures to form a stack.
The sealing ring 310 is a sealing adhesive tape disposed in the sealing groove 110, or a sealing adhesive layer formed by dispensing glue in the sealing groove 110 and curing or injection-molding hardening, or a sealing adhesive layer formed by dispensing glue on the elastic adhesive layer 320 and curing, that is, the sealing adhesive tape or the sealing adhesive layer may be disposed in the sealing groove 110 as the sealing ring 310 during processing, or the sealing adhesive layer may be disposed by dispensing glue after the elastic adhesive layer 320 is disposed on the membrane electrode frame 210 and then assembled with the bipolar plate 110. The sealing ring 310 is manufactured by the prior art, so that only one process for coating the elastic adhesive layer 320 is needed to be added, the prior production line is not required to be modified too much, and the assembly efficiency is high. The sealing ring 310 is higher than the sealing grooves 1100.1-3.0 mm, the sealing position can be sealed when the sealing ring is pressed, the elastic adhesive layer 320 is extruded into a gap of the sealing position to be sealed and filled, and a better sealing effect can be achieved through the matching of the sealing ring 310 and the elastic adhesive layer 320.
The elastic adhesive layer 320 is used for filling gaps at the joint of the membrane electrode frame 210 and the bipolar plate 100, has a thickness of 1-10 μm, and has a width greater than the width of the sealing groove 110 by 0.1-2.0 mm. By controlling the thickness of the elastic adhesive layer 320, the elastic adhesive layer 320 can be squeezed by the bipolar plate and the membrane electrode frame 210 to permeate into the gap for filling and sealing when being assembled, and a small distance can be kept between the bipolar plate and the membrane electrode 200 to ensure that the reaction is fully carried out, thereby ensuring that the fuel cell has high conversion efficiency; by controlling the width of the elastic adhesive layer 320, the elastic adhesive layer 320 can just cover the sealing ring 310 and the groove, so that the elastic adhesive layer 320 can completely fill up the gap at the sealing position, excessive materials can be avoided, and the cost is saved. The elastic adhesive layer 320 is made of an existing material with elasticity, viscosity, certain high temperature resistance and certain moisture resistance, in this embodiment, one or a mixture of several of organic silicon polymer, polyurethane, polyolefin, epoxy resin polymer, polyacrylate and polymethacrylate is adopted, and the material is applied to a sealing position as the elastic adhesive layer 320 to play a role in adhering and filling gaps.
Example 2
The present embodiment provides a stack including a plurality of the assembly structures of embodiment 1, which are sequentially stacked in series, and two current collecting plates, two end plates, and two fasteners. The collector plates are used for conveying electric energy generated by the galvanic pile to an external load and are respectively positioned on the upper side and the lower side of the stacked assembly structure; the end plates are respectively positioned on one side of the current collecting plate away from the assembly structure and are used for providing enough contact pressure to the stacked assembly structure to transfer the packaging load to the bipolar plate 100 and the membrane electrode frame 210 so as to press the sealing layers to realize sealing; the fastener is connected and fixed with the end plate so as to fasten a plurality of stacked assembly structures, maintain the contact pressure of each assembly structure and ensure the sealing effect. The electric pile of the embodiment adopts an assembly structure with better sealing performance, so that the conversion efficiency is higher.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (9)
1. The membrane electrode and bipolar plate assembly structure comprises a membrane electrode, a bipolar plate and a sealing layer, wherein sealing grooves are formed in two sides of the bipolar plate, the membrane electrode and bipolar plate assembly structure is characterized in that the sealing layer comprises a sealing ring and an elastic adhesive layer, the sealing ring is arranged in the sealing groove, the elastic adhesive layer covers the sealing ring and the bipolar plate, one side of the bipolar plate is assembled and connected with one side of the membrane electrode through the sealing ring and the elastic adhesive layer, and the elastic adhesive layer fills gaps at the joint of the membrane electrode and the bipolar plate.
2. The assembly structure of a membrane electrode and a bipolar plate according to claim 1, wherein the membrane electrode comprises a membrane electrode frame and a membrane electrode body, the membrane electrode body is arranged in the membrane electrode frame, the membrane electrode body comprises an anode diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode diffusion layer which are sequentially stacked, and the membrane electrode frame is assembled and connected with the bipolar plate through the seal ring and the elastic adhesive layer.
3. The membrane electrode and bipolar plate assembly structure of claim 1, wherein the thickness of the elastic adhesive layer is 1-10 μm, and/or the width of the elastic adhesive layer is 0.1-2.0 mm greater than the width of the sealing groove.
4. A membrane electrode and bipolar plate assembly as claimed in claim 1, wherein the elastic adhesive layer is made of silicone polymer, polyurethane, polyolefin, epoxy polymer, polyacrylate or polymethacrylate.
5. The membrane electrode and bipolar plate assembly structure of claim 1, wherein the sealing ring is a sealing rubber strip disposed in the sealing groove, or a sealing adhesive layer formed by spot gluing water curing or injection molding hardening in the sealing groove, or a sealing adhesive layer formed by spot gluing water curing on the elastic adhesive layer.
6. The membrane electrode and bipolar plate assembly structure of claim 1, wherein the sealing ring is 0.1-3.0 mm higher than the sealing groove.
7. The assembly structure of a membrane electrode and a bipolar plate according to claim 2, wherein through holes are formed at both ends of the bipolar plate, the sealing grooves are formed around the through holes, and the through holes are correspondingly formed in the frame of the membrane electrode, so that the through holes of the frame of the membrane electrode are opposite to the through holes of the bipolar plate and have the same size after the membrane electrode and the bipolar plate are assembled.
8. The membrane electrode and bipolar plate assembly as claimed in claim 2, wherein the membrane electrode frame is made of PI, PET, PEEK, PPS or PEN, and/or the bipolar plate is made of carbon, flexible graphite, titanium or stainless steel.
9. A stack comprising a plurality of the membrane electrode and bipolar plate assembly of any one of claims 1 to 8 stacked in sequence, and current collecting plates, end plates and fasteners, wherein the current collecting plates are located at the upper and lower sides of the stacked assembly, and the end plates are located at the side of the current collecting plates away from the assembly; the fasteners are used for connecting and fixing the end plates so as to fasten a plurality of stacked assembly structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121466447.XU CN215527767U (en) | 2021-06-29 | 2021-06-29 | Assembly structure of membrane electrode and bipolar plate and electric pile comprising assembly structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121466447.XU CN215527767U (en) | 2021-06-29 | 2021-06-29 | Assembly structure of membrane electrode and bipolar plate and electric pile comprising assembly structure |
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| CN215527767U true CN215527767U (en) | 2022-01-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114420964A (en) * | 2022-03-29 | 2022-04-29 | 武汉众宇动力系统科技有限公司 | Metal bipolar plate for fuel cell and injection molding method of sealing member thereof |
| CN116799240A (en) * | 2023-08-29 | 2023-09-22 | 北京氢璞创能科技有限公司 | Bipolar plate sealing method for detachable fuel cell stack |
| CN117577904A (en) * | 2023-10-31 | 2024-02-20 | 江苏耀扬新能源科技有限公司 | Refurbishable fuel cell structure and processing technology thereof |
-
2021
- 2021-06-29 CN CN202121466447.XU patent/CN215527767U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114420964A (en) * | 2022-03-29 | 2022-04-29 | 武汉众宇动力系统科技有限公司 | Metal bipolar plate for fuel cell and injection molding method of sealing member thereof |
| CN116799240A (en) * | 2023-08-29 | 2023-09-22 | 北京氢璞创能科技有限公司 | Bipolar plate sealing method for detachable fuel cell stack |
| CN117577904A (en) * | 2023-10-31 | 2024-02-20 | 江苏耀扬新能源科技有限公司 | Refurbishable fuel cell structure and processing technology thereof |
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Effective date of registration: 20220128 Address after: 528200 room 101-12, block 3, Liandong Yougu Beiyuan, No. 1, East Second District, Jiansha Road, Danzao Town, Nanhai District, Foshan City, Guangdong Province (residence declaration) Patentee after: Hongji chuangneng Technology (Foshan) Co.,Ltd. Address before: 510000 No. 8, Hongyuan Road, Huangpu District, Guangzhou, Guangdong Patentee before: HONGJI CHUANGNENG TECHNOLOGY (GUANGZHOU) Co.,Ltd. |
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