CN114023992A - Integrated membrane electrode frame sealing structure with double-sided glue injection - Google Patents
Integrated membrane electrode frame sealing structure with double-sided glue injection Download PDFInfo
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- CN114023992A CN114023992A CN202111308604.9A CN202111308604A CN114023992A CN 114023992 A CN114023992 A CN 114023992A CN 202111308604 A CN202111308604 A CN 202111308604A CN 114023992 A CN114023992 A CN 114023992A
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- 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
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- 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
- H01M8/0276—Sealing means characterised by their form
- H01M8/0278—O-rings
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides an integrated membrane electrode frame sealing structure with double-sided glue injection, which comprises a frame assembly and a glue injection sealing ring; the frame assembly comprises a first frame film and a second frame film which are arranged in a fitting mode; a plurality of first slotted holes are formed in the circumferential direction of the side edge of the first frame film, a plurality of second slotted holes are formed in the circumferential direction of the side edge of the second frame film, and the first slotted holes and the second slotted holes are arranged in a staggered mode; the first slot hole on the inner side surface of the first frame film and the second slot hole on the inner side surface of the second frame film are connected in an intersecting manner to form a communicated third slot hole, and a glue injection through hole is formed at the joint of the intersection; the injecting glue sealing washer includes first sealing ring, second sealing ring and sealed post, sealed post set up in the injecting glue through-hole, first sealing ring set up in the edge of first frame membrane lateral surface, the second sealing ring set up in the edge of second frame membrane lateral surface. The air tightness and the insulativity of the membrane electrode can be guaranteed, and the membrane electrode is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of sealing of fuel cells, in particular to an integrated membrane electrode frame sealing structure with double-sided glue injection.
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. 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 methods of the sealant lines require dispensing or attaching a rubber ring for many times, which is inconvenient for the assembly of the stack, has low assembly efficiency, and is also easy to damage core components such as the membrane electrode or the bipolar plate, thereby affecting the performance of the whole 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.
Disclosure of Invention
Based on the above, the invention provides an integrated double-sided glue injection membrane electrode frame sealing structure, and aims to solve the problems that the existing sealing glue line forming mode is complex in operation, inconvenient for assembly of a stack, low in assembly efficiency and productivity, easy to damage core components such as a membrane electrode and a bipolar plate, and complex in operation and high in cost because the bipolar plate or the membrane electrode needs to be integrally replaced when the fuel cell is poorly sealed due to the sealing glue line problem.
In order to achieve the purpose, the invention provides the following technical scheme:
the application provides an integrated double-sided glue injection membrane electrode frame sealing structure which is used for sealing a membrane electrode and comprises a frame assembly and a glue injection sealing ring; the frame assembly comprises a first frame film (namely an upper frame film) and a second frame film (namely a lower frame film) which are attached to each other;
a plurality of first slotted holes are formed in the circumferential direction of the side edge of the first frame film, a plurality of second slotted holes are formed in the circumferential direction of the side edge of the second frame film, and the first slotted holes and the second slotted holes are alternately arranged;
when the first frame film and the second frame film are attached, the first slot hole in the inner side surface of the first frame film and the second slot hole in the inner side surface of the second frame film are connected in an intersecting manner to form a communicated third slot hole, and a glue injection through hole is formed at the joint of the intersection;
the glue injection sealing ring comprises a first sealing ring, a second sealing ring and a sealing column, and the sealing column is respectively connected with the first sealing ring and the second sealing ring; the sealing columns are arranged in the glue injection through holes, the first sealing rings are arranged at the edges of the outer side surfaces of the first frame films, and the second sealing rings are arranged at the edges of the outer side surfaces of the second frame films.
Furthermore, the first slot and the second slot are arranged in the same horizontal space.
Further, the first sealing ring comprises a first slot hole part arranged in the first slot hole and a first edge part arranged on the edge of the outer side surface of the first frame film, and the first slot hole part and the first edge part are integrally molded;
the second sealing ring comprises a second slot hole portion arranged in the second slot hole and a second edge portion arranged at the edge of the outer side face of the second frame film, and the second slot hole portion and the second edge portion are integrally formed. Therefore, the bonding force between the sealing ring and the frame membrane can be well enhanced, and the insulating property of the membrane electrode is effectively ensured while the air tightness of the membrane electrode is effectively improved.
Further, the glue injection sealing ring further comprises a third sealing ring arranged in the third slot hole, and the third sealing ring is connected with the sealing column. Through the third sealing ring, the first frame film and the second frame film can be well attached and sealed, and the bonding and the sealing performance of the first frame film and the second frame film are guaranteed.
Further, the side surface of the first frame film comprises an inner side surface and an outer side surface, the inner side surface of the first frame film is the side surface of the first frame film close to the second frame film, and the outer side surface of the first frame film is the side surface of the first frame film far away from the second frame film;
the side surface of the second frame film comprises an inner side surface and an outer side surface, the inner side surface of the second frame film is the side surface of the second frame film close to the first frame film, and the outer side surface of the second frame film is the side surface of the second frame film far away from the first frame film.
Further, the first sealing ring, the second sealing ring, the third sealing ring and the sealing column are integrally formed through glue injection through holes in a glue injection molding mode.
Further, the sum of the thicknesses of the first frame film and the second frame film is equal to the height of the sealing column. Therefore, the air tightness of the frame film can be well ensured.
Further, the material of the frame component is preferably PI, PEN, PET or PPS.
Further, the width of the first slotted hole is 0.1-10.0mm, and the length is 0.1-500 mm; the width of the second slotted hole is 0.1-10.0mm, and the length is 0.1-500 mm. Compared with the existing round hole arrangement, the slot hole is arranged, the width and the length of the slot hole are controlled, the operation difficulty of glue injection can be reduced, and the yield is effectively improved.
Further, the diameter of the glue injection through hole is preferably 0.1-10.0 mm; the glue injection through hole can be a round hole, a square hole or a special-shaped hole.
Further, the width of the first sealing ring is 1.0-20mm, and the height of the first sealing ring is 0.1-5.0 mm; the width of the second sealing ring is 1.0-20mm, and the height of the second sealing ring is 0.1-5.0 mm; the width of the third sealing ring is 1.0-20mm, and the height of the third sealing ring is 0.1-5.0 mm. In this application, the sealing ring generally sets up in the intermediate position of slotted hole, and the width of sealing ring is greater than the width of slotted hole, and like this can the gas tightness of frame subassembly.
Further, the material of the glue injection sealing ring is preferably silica gel, ethylene propylene diene monomer, dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone rubber or silicone cyanide rubber.
Furthermore, three cavity fluid channels matched with the membrane electrodes are arranged at two ends of the frame assembly.
Further, the edge is preferably an area of the rim component 3.0-30.0mm away from the border of the rim component.
Compared with the prior art, the method has the following technical effects:
according to the invention, the first frame membrane and the second frame membrane are combined to form a double-frame structure, and the membrane electrode is sealed by integrally injecting glue on the double-frame structure, so that the sealing property of the membrane electrode is effectively ensured, and the insulating property of the membrane electrode can be effectively improved while the hydrogen-oxygen cross gas of the membrane electrode is prevented.
The slotted holes are alternately formed in the first frame film and the second frame film, so that glue injection through holes can be formed in the joint positions after the first frame film and the second frame film are attached, the risk that the membrane electrode or the bipolar plate is possibly damaged due to the fact that sealing elements are formed on the membrane electrode or the bipolar plate through glue injection is avoided, the operation difficulty of punching and glue injection is effectively reduced, hole forming efficiency is high, the yield is effectively improved, and the sealing performance between the membrane electrode and the bipolar plate can be guaranteed.
Adopt bilateral frame structure for the material of bilateral frame structure can select soft light material, when effectively guaranteeing sealing performance and insulating properties, can effectively optimize the quality and the volume of battery, improves space utilization.
According to the invention, the sealing ring is arranged on the double-side frame structure, so that when the double-side frame structure, the membrane electrode or the bipolar plate has a problem, compared with the prior art that the membrane electrode or the bipolar plate which is injected with glue needs to be integrally replaced, the double-side frame sealing structure, the membrane electrode or the bipolar plate which has the problem can be independently replaced for repair, and the repair cost of the fuel cell is greatly reduced. Moreover, the process is simple to manufacture, the injection molding sealing ring is integrally formed, repeated glue dispensing or glue ring pasting is not needed, the assembly is convenient, and the assembly efficiency and the productivity of the galvanic pile are improved; and the sealing effect is excellent, the cost is low, the practicability is strong, and the sealing device 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 a schematic top view of a frame sealing structure of an integrated double-sided injection membrane electrode according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the first frame film of FIG. 1;
FIG. 3 is a schematic top view of the second frame film of FIG. 1;
fig. 4 is a cross-sectional view of a bonding surface of a first frame film and a second frame film after bonding in an embodiment of the present application;
FIG. 5 is a schematic top view of the injection molded gasket of FIG. 1;
fig. 6 is a schematic cross-sectional structural view of seal rings (including a first seal ring, a second seal ring and a third seal ring) in an embodiment of the present application.
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, the sealing of the fuel cell is mainly realized by adopting a glue dispensing process, a screen printing process and a sealing adhesive tape pasting process on the bipolar plate, or by injecting glue on a single side or even on double sides of the graphite bipolar plate.
The efficiency of forming the sealing rubber strips by the dispensing process and the screen printing process is low, the mass production is difficult to realize, and the sealing rubber strips formed by the process are usually semi-circular arc-shaped, so that the section structure of the sealing rubber ring is difficult to optimally design. The sealing rubber strip is pasted in the bipolar plate groove by automatic equipment in some industries to realize sealing, the scheme has the disadvantages of complex bonding process, multiple production steps and low efficiency, and a small amount of dislocation is easy to occur among the membrane electrode frame, the bipolar plate and the sealing rubber strip to cause unqualified air tightness. If the sealing rubber strips are formed on the frame of the membrane electrode by single-sided silk-screen printing or glue dispensing, secondary forming of the sealing strips is needed, the process is more, and dislocation and offset are easy to occur. If the double-sided glue injection is realized on the frame in a frame punching mode, the dislocation and the deviation of the sealing rubber strips are reduced, and the spacing distance of glue injection holes is not easy to control; if the spacing distance of the glue injection holes is large, the stress of the sealing rubber strips on the front side and the back side is not uniform, and the frame film is folded or deformed; if the distance between the glue injection holes is small, the processing process is complex, and the manufacturing cost is high.
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 technical problem, the invention provides an integrated membrane electrode frame sealing structure with double-sided glue injection.
As shown in fig. 1 to 4, an integrated double-sided glue injection membrane electrode frame sealing structure provided in an embodiment of the present application is used for sealing a membrane electrode, and includes a frame assembly 10 and a glue injection sealing ring 20; the frame assembly 10 comprises a first frame film 11 (namely an upper frame film) and a second frame film 12 (namely a lower frame film) which are arranged in a laminating manner;
referring to fig. 2 to 3, a plurality of first slots 111 are circumferentially disposed on a side edge of the first frame film 11, a plurality of second slots 121 are circumferentially disposed on a side edge of the second frame film 12, and the first slots 111 and the second slots 121 are alternately disposed;
referring to fig. 4, when the first frame film 11 and the second frame film 12 are attached to each other, the first slot 111 on the inner side of the first frame film 11 and the second slot 121 on the inner side of the second frame film 12 are intersected to form a third through hole 13, and a glue injection through hole 14 is formed at the intersection of the first through hole and the second through hole;
as shown in fig. 5, the glue injection sealing ring 20 includes a first sealing ring 21, a second sealing ring 22 and a sealing post 23, and the sealing post 23 is connected to the first sealing ring 21 and the second sealing ring 22 respectively; the sealing posts 23 are arranged in the glue injection through holes 14, the first sealing ring 21 is arranged at the edge of the outer side surface of the first frame film 11, and the second sealing ring 22 is arranged at the edge of the outer side surface of the second frame film 12.
Further, the first slot 111 and the second slot 121 are disposed in the same horizontal space. In the present application, when the first frame film 11 and the second frame film 12 are attached (the attachment of the present application can be achieved by bonding, etc.), the first slots 111 and the second slots 121 are alternately disposed, that is, the first slots 111, the second slots 121, the first slots 111, and the second slots 121 are alternately disposed, and since the first slots 111 and the second slots are disposed in the same horizontal space (such as a horizontal line, a horizontal plane, etc.), the air tightness of the frame assembly can be ensured.
Further, the first seal ring 21 includes a first slot portion (not shown) disposed in the first slot 111 and a first edge portion (not shown) disposed at an edge of an outer side surface of the first frame film 11, the first slot portion and the first edge portion being integrally formed;
the second sealing ring 22 includes a second slot portion (not shown) disposed in the second slot 121 and a second edge portion (not shown) disposed at an edge of the outer side surface of the second frame film 12, and the second slot portion and the second edge portion are integrally formed. Therefore, the bonding force between the sealing ring and the frame membrane can be well enhanced, and the insulating property of the membrane electrode is effectively ensured while the air tightness of the membrane electrode is effectively improved.
Further, the glue injection sealing ring 20 further includes a third sealing ring (not shown) disposed in the third slot 13, and the third sealing ring is connected to the sealing post 23. Through the third sealing ring, can be fine first frame membrane and the laminating of second frame membrane are sealed, guarantee the bonding and the leakproofness of first frame membrane and second frame membrane, like this, bond first frame membrane and second frame membrane and realize sealed (primary seal) first way to proton exchange membrane through the third sealing ring, realize sealed (secondary seal) to proton exchange membrane's second through first sealing ring and second sealing ring.
Further, the side surface of the first frame film 11 includes an inner side surface and an outer side surface, the inner side surface of the first frame film 11 is the side surface of the first frame film 11 close to the second frame film 12, and the outer side surface of the first frame film 11 is the side surface of the first frame film 11 away from the second frame film 12;
the side surface of the second frame film 12 includes an inner side surface and an outer side surface, the inner side surface of the second frame film 12 is the side surface of the second frame film 12 close to the first frame film 11, and the outer side surface of the second frame film 12 is the side surface of the second frame film 12 far away from the first frame film 11.
Further, the first sealing ring 21, the second sealing ring 22, the third sealing ring and the sealing post 23 are integrally molded by injecting glue through the glue injection through hole. The risk that the sealing ring misplaces or drops in the assembling process can be effectively avoided, primary sealing and secondary sealing of the proton exchange membrane can be realized through the integral glue injection molding of the glue injection through hole, the sealing performance of the membrane electrode (fuel cell) can be effectively guaranteed, and the operation is convenient and fast.
Further, the sum of the thicknesses of the first frame film 11 and the second frame film 12 is equal to the height of the sealing post 23. Therefore, the air tightness of the frame film can be well ensured.
Further, the material of the frame assembly 10 is preferably PI, PEN, PET or PPS.
Further, the width of the first slot 111 is 0.1-10.0mm, and the length is 0.1-500 mm; the width of the second slot 121 is 0.1-10.0mm, and the length is 0.1-500 mm. Compared with the existing round hole arrangement, the slot hole is arranged, the width and the length of the slot hole are controlled, the operation difficulty of glue injection can be reduced, and the yield is effectively improved.
Further, the diameter of the glue injection through hole is preferably 0.1-10.0 mm; the glue injection through hole can be a round hole, a square hole or a special-shaped hole. Generally, the size of the glue injection through hole needs to be matched with the slot holes (including the first slot hole and the second slot hole), i.e. the size of the slot hole determines the diameter of the glue injection through hole.
In the embodiment of the present application, the maximum size of the glue injection through hole is as follows: when the glue injection through hole is a circular through hole, the maximum size of the cross section of the glue injection through hole is the diameter of the circular through hole; when the glue injection through hole is a square through hole or a triangular through hole, the maximum size of the cross section of the glue injection through hole 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 glue injection through hole is an oval through hole, the maximum size of the cross section of the glue injection through hole is the major diameter of the oval 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.
Further, the width of the first sealing ring 21 is 1.0-20mm, and the height is 0.1-5.0 mm; the width of the second sealing ring 22 is 1.0-20mm, and the height is 0.1-5.0 mm; the width of the third sealing ring is 1.0-20mm, and the height of the third sealing ring is 0.1-5.0 mm. In this application, the sealing rings (including the first sealing ring, the second sealing ring and the third sealing ring) are generally disposed at the middle positions of the slots (including the first slot, the second slot and the third slot, and the sealing rings and the slots are in one-to-one correspondence), and the width of the sealing rings is greater than that of the slots, so that the air tightness of the frame assembly is achieved.
Further, the material of the glue injection sealing ring 20 is preferably silica gel, ethylene propylene diene monomer, dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone rubber or silicone cyanide rubber.
Further, two ends of the frame assembly 10 are further provided with three-cavity fluid channels 15 adapted to the membrane electrodes.
Further, the edge is preferably an area of the frame assembly (including the first frame film and the second frame film) which is 3.0-30.0mm away from the boundary of the frame assembly, that is, the side edge of the first frame film is an area of the first frame film which is 3.0-30.0mm away from the boundary of the first frame film, and the side edge of the second frame film is an area of the second frame film which is 3.0-30.0mm away from the boundary of the second frame film. In the application, the frame structure design at the frame inlet and outlet is determined by the mold structure and the molding process parameter conditions during molding, and according to actual needs, the frame inlet and outlet can be opened with through holes without forming slots of continuous sealing lines or slots of continuous sealing lines.
In addition, the injection molding sealing ring can adopt a mode that glue is fed into the side surface or glue is fed into the bottom, and the injection molding sealing ring can be specifically designed according to the structure of a forming mold. In the embodiment of this application, the mode shaping that the side entered the glue is adopted to the sealing washer of moulding plastics, and the injecting glue mouth has ten.
In this application, the temperature of the region in contact with the CCM during injection molding needs to be strictly controlled, the specific temperature needs to be determined according to the material of the frame component, the material of the glue, the molding temperature and the like, and the temperature of the general contact region does not exceed 110 ℃.
In the embodiment of the present application, the cross section of the first sealing ring, the second sealing ring and the third sealing ring may be rectangular, trapezoidal, semicircular arc, triangular or rectangular with a groove structure (as shown in fig. 6). The cross section of the sealing ring is in a rectangular shape with a groove structure, so that the air tightness of the frame assembly can be better improved.
Specifically, in the integrated double-sided glue injection membrane electrode frame sealing structure in one embodiment, the frame assembly is made of a PI film, and the thickness of the frame assembly is 50 μm. The first and second slots have a diameter of 1.6mm and a length of 65 mm. The glue used for glue injection molding is silica gel, the molding temperature of the injection molding sealing ring is about 110 ℃, and the molding time is 2 min; the glue height of the first sealing ring and the second sealing ring is 0.6 +/-0.03 mm, and the glue strip width is 1.8 +/-0.03 mm. The cross sections of the first sealing ring and the second sealing ring are rectangular structures with grooves, so that the effects of reducing pressure and sealing bidirectionally layer by layer can be achieved. In this embodiment, the temperature of the active area of the membrane electrode needs to be strictly controlled to be less than or equal to 75 ℃ during the production process of the gel injection process. The injection molding sealing ring after injection molding has no bubbles, white spots and glue shortage, and is regarded as a qualified product after the size is qualified.
During the use, place proton exchange membrane (CCM) between the first frame membrane and the second frame membrane of the structure of this application, and proton exchange membrane places in the sealing area of third sealing ring, bond first frame membrane and second frame membrane and realize first sealing (primary seal) to proton exchange membrane through the third sealing ring, realize the second way to proton exchange membrane through first sealing ring and second sealing ring and seal (secondary seal), then it can to pile up fixedly according to the order with other subassemblies together. According to the embodiment of the application, the sealing rings are fixed on the two sides of the frame assembly, and the sealing rings on the two sides are connected through the glue injection through holes, so that the sealing rings can be more stably fixed on the frame assembly, and the sealing of a membrane electrode is facilitated; and moreover, the sealing ring is arranged on the frame assembly, so that the damage of a membrane electrode and a bipolar plate which are possibly caused by directly injecting glue to the sealing ring on a membrane electrode frame or the bipolar plate is avoided, and when a problem occurs, the frame assembly can be independently replaced without replacing the bipolar plate or other components.
The three-cavity fluid channel in the embodiment of the application refers to a fuel channel, a cooling water channel and an oxidant channel; 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 frame component; the fuel outlet, the cooling water outlet and the oxidant inlet are arranged at the other end of the frame assembly. The fuel channel, the cooling water channel and the oxidant channel are respectively communicated with corresponding channels on the membrane electrode, and simultaneously the fuel channel, the cooling water channel and the oxidant channel are also respectively communicated with corresponding channels on the bipolar plate.
In the present embodiment, in order to ensure the sealing performance among the membrane electrode, the bipolar plate and the frame assembly, the first sealing ring is disposed around the inlet and outlet of the three-cavity fluid channel on one side of the frame assembly, and the second sealing ring is disposed around the inlet and outlet of the three-cavity fluid channel on the other side of the frame assembly.
In the invention, the first frame membrane and the second frame membrane are combined to form a double-frame structure, and the membrane electrode is sealed by integrally injecting glue on the double-frame structure, so that the sealing property of the membrane electrode is effectively ensured, the hydrogen-oxygen gas leakage of the membrane electrode is prevented, and the insulating property of the membrane electrode can be effectively improved.
The slotted holes are alternately formed in the first frame film and the second frame film, so that glue injection through holes can be formed in the joint after the first frame film and the second frame film are attached, the risk that the membrane electrode or the bipolar plate is possibly damaged due to the fact that sealing elements are formed on the membrane electrode or the bipolar plate through glue injection is avoided, the operation difficulty of punching and glue injection is effectively reduced, the yield is effectively improved, and the sealing performance between the membrane electrode and the bipolar plate can be guaranteed.
For unilateral frame structure, this application adopts bilateral frame structure for the material of bilateral frame structure can select the material of soft light, when effectively guaranteeing sealing performance and insulating properties, can effectively optimize the quality and the volume of battery, improves space utilization.
According to the invention, the sealing ring is arranged on the double-side frame structure, so that when the double-side frame structure, the membrane electrode or the bipolar plate has a problem, compared with the prior art that the membrane electrode or the bipolar plate which is injected with glue needs to be integrally replaced, the double-side frame sealing structure, the membrane electrode or the bipolar plate which has the problem can be independently replaced for repair, and the repair cost of the fuel cell is greatly reduced. Moreover, the invention has the advantages of simple process, 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 is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by 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. An integrated double-sided glue injection membrane electrode frame sealing structure is used for sealing a membrane electrode and is characterized by comprising a frame assembly and a glue injection sealing ring; the frame assembly comprises a first frame film and a second frame film which are arranged in a fitting mode;
a plurality of first slotted holes are formed in the circumferential direction of the side edge of the first frame film, a plurality of second slotted holes are formed in the circumferential direction of the side edge of the second frame film, and the first slotted holes and the second slotted holes are alternately arranged;
the first slot hole on the inner side surface of the first frame film and the second slot hole on the inner side surface of the second frame film are connected in an intersecting manner to form a communicated third slot hole, and a glue injection through hole is formed at the joint of the intersection;
the glue injection sealing ring comprises a first sealing ring, a second sealing ring and a sealing column, and the sealing column is respectively connected with the first sealing ring and the second sealing ring; the sealing columns are arranged in the glue injection through holes, the first sealing rings are arranged at the edges of the outer side surfaces of the first frame films, and the second sealing rings are arranged at the edges of the outer side surfaces of the second frame films.
2. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein the first slot hole and the second slot hole are arranged in the same horizontal space; the first sealing ring comprises a first slot hole part arranged in the first slot hole and a first edge part arranged on the edge of the outer side surface of the first frame film, and the first slot hole part and the first edge part are integrally formed;
the second sealing ring comprises a second slot hole portion arranged in the second slot hole and a second edge portion arranged at the edge of the outer side face of the second frame film, and the second slot hole portion and the second edge portion are integrally formed.
3. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein the glue injection sealing ring further comprises a third sealing ring arranged in the third slot, and the third sealing ring is connected with the sealing column.
4. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1 or 2, wherein the side face of the first frame membrane comprises an inner side face and an outer side face, the inner side face of the first frame membrane is the side face of the first frame membrane close to the second frame membrane, and the outer side face of the first frame membrane is the side face of the first frame membrane far away from the second frame membrane;
the side surface of the second frame film comprises an inner side surface and an outer side surface, the inner side surface of the second frame film is the side surface of the second frame film close to the first frame film, and the outer side surface of the second frame film is the side surface of the second frame film far away from the first frame film.
5. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 3, wherein the first sealing ring, the second sealing ring, the third sealing ring and the sealing columns are integrally formed through glue injection through holes.
6. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein the sum of the thicknesses of the first frame film and the second frame film is equal to the height of the sealing column.
7. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein the frame component is made of PI, PEN, PET or PPS; the material of the glue injection sealing ring is silica gel, ethylene propylene diene monomer rubber, dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorine silicon rubber or cyanide silicone rubber.
8. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein the width of the first slot is 0.1-10.0mm, and the length is 0.1-500 mm; the width of the second slotted hole is 0.1-10.0mm, and the length is 0.1-500 mm; the diameter of the glue injection through hole is 0.1-10.0 mm; the glue injection through hole is a round hole, a square hole or a special-shaped hole.
9. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 3, wherein the width of the first sealing ring is 1.0-20mm, and the height is 0.1-5.0 mm; the width of the second sealing ring is 1.0-20mm, and the height of the second sealing ring is 0.1-5.0 mm; the width of the third sealing ring is 1.0-20mm, and the height of the third sealing ring is 0.1-5.0 mm.
10. The integrated double-sided glue injection membrane electrode frame sealing structure according to claim 1, wherein three cavity fluid channels adapted to the membrane electrodes are further provided at two ends of the frame assembly; the edge is an area on the edge frame assembly 3.0-30.0mm away from the boundary of the edge frame assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308604.9A CN114023992A (en) | 2021-11-05 | 2021-11-05 | Integrated membrane electrode frame sealing structure with double-sided glue injection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308604.9A CN114023992A (en) | 2021-11-05 | 2021-11-05 | Integrated membrane electrode frame sealing structure with double-sided glue injection |
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| CN114023992A true CN114023992A (en) | 2022-02-08 |
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| CN202111308604.9A Pending CN114023992A (en) | 2021-11-05 | 2021-11-05 | Integrated membrane electrode frame sealing structure with double-sided glue injection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115084570A (en) * | 2022-08-11 | 2022-09-20 | 北京开元新能科技有限公司 | Glue injection structure for bipolar plate and glue injection sealed bipolar plate |
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2021
- 2021-11-05 CN CN202111308604.9A patent/CN114023992A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115084570A (en) * | 2022-08-11 | 2022-09-20 | 北京开元新能科技有限公司 | Glue injection structure for bipolar plate and glue injection sealed bipolar plate |
| CN115084570B (en) * | 2022-08-11 | 2022-11-08 | 北京开元新能科技有限公司 | Glue injection structure for bipolar plate and glue injection sealed bipolar plate |
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