CN111730803B - Preparation method of sealing structure and sealing connection method of membrane electrode and bipolar plate - Google Patents
Preparation method of sealing structure and sealing connection method of membrane electrode and bipolar plate Download PDFInfo
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- CN111730803B CN111730803B CN202010625156.4A CN202010625156A CN111730803B CN 111730803 B CN111730803 B CN 111730803B CN 202010625156 A CN202010625156 A CN 202010625156A CN 111730803 B CN111730803 B CN 111730803B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
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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
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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
- H01M8/0286—Processes for forming seals
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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
- H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
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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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3468—Batteries, accumulators or 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
- 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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- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
Abstract
The application provides a preparation method of a sealing structure and a sealing connection method of a membrane electrode and a bipolar plate. The sealing structure is matched with a mold for preparation, and the mold is provided with a mold cavity and a liquid inlet communicated with the mold cavity. The membrane electrode comprises a frame, and the frame is provided with a glue placing area. The preparation method comprises the following steps: and placing the membrane electrode with the frame in a mold, and enabling the mold cavity of the mold and the adhesive placing area to form a communicated adhesive cavity. And filling flowable sealing ring raw materials into the rubber cavity from the liquid inlet, so that the sealing ring raw materials flow in the rubber cavity and fill the rubber cavity. Solidifying the raw material of the sealing ring, forming the sealing ring on the glue placing area, and taking out the membrane electrode with the sealing ring. The preparation method can ensure that the thickness and the width of the sealing ring are more uniform, the flatness of the sealing ring is better, and the sealing connection between the membrane electrode and the bipolar plate is facilitated.
Description
Technical Field
The application relates to the technical field of fuel cell preparation, in particular to a preparation method of a sealing structure and a sealing connection method of a membrane electrode and a bipolar plate.
Background
A fuel cell is a stack of a plurality of stacked single cells connected in series with a certain output voltage and power. The unit cell includes bipolar plates and a Membrane Electrode Assembly (MEA) interposed between the bipolar plates, and the bipolar plates have flow channels for separating fuel gas (e.g., hydrogen) from oxidant (e.g., oxygen or air), preventing gas from permeating, and collecting and conducting current.
In order to avoid the occurrence of the gas leakage phenomenon or the cross leakage of different kinds of gases, a sealing member needs to be arranged between the membrane electrode and the bipolar plate. In the prior art, glue is generally dispensed on a frame of a membrane electrode, and then the glue after dispensing is cured, so as to form a sealing ring on the frame. The sealing ring formed by the method has uneven thickness and poor flatness.
Disclosure of Invention
A first objective of the present application is to provide a method for preparing a sealing structure on a membrane electrode, which can form a sealing ring with a more uniform structure on the membrane electrode.
A second objective of the present application is to provide a method for sealing and connecting a membrane electrode and a bipolar plate, wherein the structure of the sealing ring is more uniform, so that the sealing effect between the membrane electrode and the bipolar plate is better.
In a first aspect, the application provides a method for preparing a sealing structure on a membrane electrode, which is matched with a mold to prepare, wherein the mold is provided with a mold cavity and a liquid inlet communicated with the mold cavity. The membrane electrode comprises a frame, the frame is provided with a glue placing area, and the preparation method comprises the following steps: and placing the membrane electrode with the frame in a mold, so that the mold cavity and the adhesive placing area of the mold enclose a glue cavity communicated with the liquid inlet. And filling the flowable sealing ring raw material into the rubber cavity from the liquid inlet, so that the sealing ring raw material flows in the rubber cavity and fills the rubber cavity. Solidifying the raw material of the sealing ring, forming the sealing ring on the glue placing area, and taking out the membrane electrode with the sealing ring.
Through the matching of the die and the frame, the membrane electrode with the sealing ring can be continuously produced, and the production efficiency is improved. The mold cavity of the mold is matched with the rubber placing area at the frame to form a rubber cavity structure, then the rubber cavity structure is filled with flowable sealing ring raw materials and solidified, and the structure of the sealing ring formed on the rubber placing area is consistent with that of the rubber cavity. Can form arbitrary sealing washer structure according to the die cavity structure setting of mould, improve the size precision of sealing washer, and can make the structure of sealing washer more even, the roughness is better, is favorable to the sealing connection between membrane electrode and the bipolar plate.
In a possible embodiment, before curing the raw material of the sealing ring, a step of preheating the mold is further included.
The mold is preheated firstly, so that the raw material of the filled sealing ring has better fluidity in the rubber cavity, the rubber cavity is filled with the raw material more easily, the preparation efficiency is improved, and the raw material is prevented from being solidified in the flowing process.
In one possible embodiment, the mold is preheated to a temperature of 100-160 ℃ before the framed membrane electrode is placed in the mold. The preheating temperature of the mold is relatively high and is generally carried out in a high-temperature furnace. If the membrane electrode is preheated in a high-temperature furnace after being arranged in the mold, the structure of the membrane electrode can be damaged, so that the membrane electrode is arranged after the membrane electrode is preheated, so that the flowability of the raw material of the sealing ring in the rubber cavity is better, and the performance of the membrane electrode cannot be damaged.
In one possible embodiment, the material of the sealing ring is thermoplastic, thermosetting elastomer polymer, and the bonding force between the sealing ring and the membrane electrode is larger than that between the sealing ring and the mold. Because the frame of the membrane electrode is made of high polymer materials and the material of the sealing ring is selected, the bonding force between the membrane electrode and the sealing ring can be larger, the sealing ring can be demoulded in a mould under the condition of not adding a demoulding agent, and the preparation is simpler.
In one possible embodiment, the raw material of the sealing ring is selected from one or more of ethylene propylene diene monomer, silicone rubber, polyurethane, polyacrylate and polyisobutylene, and the raw material of the sealing ring is cured by the following method: standing at room temperature for 3-30min. The sealing ring raw materials filled in the rubber cavity can be solidified at normal temperature, so that the sealing ring is convenient to form.
In a possible embodiment, before the membrane electrode with the frame is placed in the mold, a layer of adhesive is coated on the glue placing area of the frame, and then the adhesive is cured to form an adhesive layer for limiting the sliding of the sealing ring. The adhesive layer increases the adhesive force of the sealing ring on the frame, prevents the sealing ring from sliding when being extruded, and can ensure that the fixing effect between the bipolar plate and the membrane electrode is better; and the binding force between the sealing ring and the membrane electrode is further increased, so that the sealing ring is easier to demould from the mould.
In one possible embodiment, the width of the adhesive layer is smaller than the width of the sealing ring, the width of the adhesive layer is 1.4-4.6mm, and the width of the sealing ring is 2-5mm.
The sealing washer cladding adhesive linkage, the adhesive linkage mainly bonds the inside of sealing washer, avoids the adhesive linkage to surpass the sealing washer, and restricts the slip of sealing washer.
In one possible embodiment, the material of the adhesive is selected from one or more of tetrabutyl titanate, hexamethyldisiloxane, ethyl orthosilicate, trimethyl tert-butyl peroxysilane and vinyltriacetoxysilane, and the adhesive is cured by: standing at room temperature for 15-60min. The curing is carried out at normal temperature, and the curing mode of the adhesive is simple and easy to realize.
In one possible embodiment, the material of the adhesive is selected from one or more of gamma-methacryloxypropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and propenyl trimethoxysilane, and the adhesive is cured by: curing at 50-180 deg.C for 3-15min. The curing speed of the adhesive can be increased, and the preparation efficiency can be higher.
In one possible embodiment, the mold comprises an upper mold and a lower mold, the upper mold is provided with an upper mold cavity, the lower mold is provided with a lower mold cavity, and the liquid inlet is communicated with the upper mold cavity and the lower mold cavity; the upper surface of the frame is provided with an upper glue placing area, and the lower surface of the frame is provided with a lower glue placing area; the preparation method comprises the following steps: and (3) placing the membrane electrode with the frame on the lower die, enabling the lower die cavity and the lower glue placing area to define a lower glue cavity communicated with the liquid inlet, and closing the upper die and the lower die to enable the upper die cavity and the upper glue placing area to define an upper glue cavity communicated with the liquid inlet. And sealing ring raw materials are filled in the upper rubber cavity and the lower rubber cavity from the liquid inlet, so that the sealing ring raw materials flow in the upper rubber cavity and the lower rubber cavity and fill the upper rubber cavity and the lower rubber cavity. Solidifying the raw material of the sealing ring, forming an upper sealing ring on the upper glue placing area, forming a lower sealing ring on the lower glue placing area, and taking out the membrane electrode with the upper sealing ring and the lower sealing ring.
Can pass through the mould, form the upper seal circle simultaneously at the upper surface of frame, the lower surface forms the lower seal circle, has improved the preparation efficiency of sealing washer, and the preparation quality of sealing washer is also higher.
In a second aspect, the present application provides a method for sealing and connecting a membrane electrode and a bipolar plate, wherein a sealing ring is formed on a frame of the membrane electrode by the above preparation method. And the surface of the sealing ring, which is deviated from the frame, is arranged in the sealing groove of the bipolar plate, so that the bipolar plate is hermetically connected with the membrane electrode.
The sealing ring with high quality is prepared by the method, so that the sealing effect between the bipolar plate and the membrane electrode is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it is within the scope of the present application that those skilled in the art can also obtain other related drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a first planar structure of a membrane electrode;
FIG. 2 is a schematic layer structure of a membrane electrode;
FIG. 3 is a second schematic plan view of the membrane electrode assembly;
FIG. 4 is a schematic view showing a structure after a sealing structure is formed on a membrane electrode;
FIG. 5 is an exploded view of a mold and a membrane electrode according to an embodiment of the present disclosure;
FIG. 6 is a first flowchart of a method for preparing a sealing structure on a membrane electrode according to an embodiment of the present disclosure;
FIG. 7 is a second flowchart of a method for preparing a sealing structure on a membrane electrode according to an embodiment of the present application;
fig. 8 is a cross-sectional view of a sealing structure on a membrane electrode according to an embodiment of the present application.
An icon: 100-a membrane electrode; 110-CCM; 120-a first diffusion layer; 130-a second diffusion layer; 140-a first rim; 150-a second bezel; 141-glue-applying area; 160-upper sealing ring; 200-a mold; 210-upper mould; 220-lower die; 221-lower mold cavity; 230-a liquid inlet; 222-lower liquid inlet tank; 170-adhesive layer.
Detailed Description
In the fuel cell, the membrane electrode and the bipolar plate are hermetically connected to form a single cell. The bipolar plate comprises a cathode plate and an anode plate, wherein the cathode plate is connected to the cathode side of the membrane electrode in a sealing mode, and the anode plate is connected to the anode side of the membrane electrode in a sealing mode.
In order to realize the sealing connection between the membrane electrode and the bipolar plate, a sealing ring needs to be formed on the membrane electrode and is arranged in a sealing groove of the bipolar plate. Therefore, the quality of the seal ring affects the sealing effect between the membrane electrode and the bipolar plate.
The structure of the membrane electrode is described below. FIG. 1 is a schematic diagram of a first planar structure of a membrane electrode 100; fig. 2 is a schematic view of the layer structure of the membrane electrode 100. Referring to fig. 1 and 2, a membrane electrode 100 includes a CCM 110 (the CCM 110 includes a proton exchange membrane and a cathode catalyst layer and an anode catalyst layer respectively disposed on two surfaces of the proton exchange membrane), a first diffusion layer 120, a second diffusion layer 130 (if the first diffusion layer 120 is an anode diffusion layer, the second diffusion layer 130 is a cathode diffusion layer; if the first diffusion layer 120 is a cathode diffusion layer, the second diffusion layer 130 is an anode diffusion layer), a first frame 140, and a second frame 150. The CCM 110 is sandwiched between the first frame 140 and the second frame 150, the first diffusion layer 120 is disposed on a side of the first frame 140 away from the CCM 110, and the second diffusion layer 130 is disposed on a side of the second frame 150 away from the CCM 110 (the anode diffusion layer corresponds to the anode catalyst layer, and the cathode diffusion layer corresponds to the cathode catalyst layer).
The frame (which includes the first frame 140 and the second frame 150) is made of a non-conductive, gas impermeable, high temperature resistant material that separates the various conductive layers (e.g., the anode catalyst layer and the anode diffusion layer, and the cathode catalyst layer and the cathode diffusion layer). The fuel gas holes, the oxidizing gas holes, and the coolant holes are formed in the rim, and the holes penetrate the first rim 140 and the second rim 150. The sealing ring is arranged, so that the gas leakage phenomenon can be avoided, and the cross leakage of the fuel gas, the oxidizing gas and the coolant can be avoided.
Fig. 3 is a second plane structure diagram of the membrane electrode 100. Referring to fig. 3, a sealing ring is required to be disposed in the glue-applying region (dotted line region) of fig. 3, so as to achieve the installation between the bipolar plate and the membrane electrode 100. Specifically, the upper surface of the frame of the membrane electrode 100 has an upper adhesive region 141, and the lower surface of the frame has a lower adhesive region (the region of the upper adhesive region 141 is a dotted line region in fig. 3, and the region of the lower adhesive region is a lower surface region symmetrical to the dotted line region in fig. 3). That is to say: the frame includes a first frame 140 and a second frame 150, the upper glue-placing area 141 is a dotted area of the surface of the first frame 140 departing from the second frame 150, and the lower glue-placing area is an area symmetrically formed on the lower surface of the second frame 150.
Fig. 4 is a schematic structural view of the membrane electrode 100 after a sealing structure is formed. Referring to fig. 4, in order to form a seal ring in the glue applying region (dotted line region) of fig. 3 of the membrane electrode 100 to obtain the structure of fig. 4, in the prior art, a needle of an automatic glue dispenser is required to continuously move on the first frame 140 (upper surface of the frame) of the membrane electrode 100 along the track of the dotted line region, so that glue is deposited in the glue applying region 141 (dotted line region) of the first frame 140, and then is cured to form the upper seal ring 160. After the curing is completed, the membrane electrode 100 is turned over by 180 °, and a needle of an automatic dispenser is used to continuously move on the second frame 150 (the lower surface of the frame) of the membrane electrode 100 along a symmetrical track at the dotted line area, so that the glue is deposited on the glue placing area of the second frame 150, and then is cured to form a lower sealing ring, thereby forming sealing rings on both surfaces of the frame. The method has the defects that the precision of the glue dispenser in the current market is poor, the sealing rubber strips with uniform thickness and consistent flatness are difficult to dispense, the upper sealing ring 160 is required to be formed on the upper surface of the frame and cured, then the lower sealing ring is formed on the lower surface of the frame and cured, and the preparation efficiency is low.
Therefore, in the present application, another method is used to form the seal ring on the membrane electrode 100, the thickness of the seal ring is more uniform, the flatness is more consistent, and the sealing connection effect between the bipolar plate and the membrane electrode 100 is better.
Example 1
The preparation method is matched with a mould for preparation. Fig. 5 is an exploded view of a mold 200 and a membrane electrode 100 according to an embodiment of the present disclosure, and referring to fig. 5, the mold 200 has a mold cavity and a liquid inlet 230 communicating with the mold cavity. Further, the mold 200 includes an upper mold 210 and a lower mold 220, the upper mold 210 having an upper mold cavity, the lower mold 220 having a lower mold cavity 221, and the liquid inlet 230 communicating with both the upper mold cavity and the lower mold cavity 221.
As shown, an upper cavity is formed in the lower surface of the upper mold 210, the upper cavity has a certain depth (the depth is not limited, and is mainly related to the compression performance (elastic performance) of the formed sealing ring and the depth of the sealing groove of the bipolar plate), and the shape of the upper cavity is consistent with the shape of the upper rubberized region 141. The lower mold cavity 221 is formed on the upper surface of the lower mold 220, the lower mold cavity 221 has a certain depth (the depth is not limited, and mainly relates to the compression performance of the formed sealing ring and the depth of the sealing groove of the bipolar plate), and the shape of the lower mold cavity 221 is consistent with the shape of the lower potting area.
Fig. 6 is a first flowchart of a method for manufacturing a sealing structure on a membrane electrode 100 according to an embodiment of the present application. Referring to fig. 6, the preparation method includes the following steps:
s10, the membrane electrode 100 is prepared.
S20, the membrane electrode 100 with the frame is placed in the mold 200, so that the mold cavity and the glue placing area of the mold 200 enclose a glue cavity communicated with the liquid inlet 230. Alternatively, the membrane electrode 100 with the frame is placed on the lower mold 220, so that the lower mold cavity 221 and the lower adhesive placing area enclose a lower adhesive cavity communicated with the liquid inlet 230, and the upper mold 210 and the lower mold 220 are closed, so that the upper mold cavity and the upper adhesive placing area 141 enclose an upper adhesive cavity communicated with the liquid inlet 230.
For example: the lower surface of the second frame 150 contacts with the upper surface of the lower mold 220, and the second frame 150 closes the lower mold cavity 221 of the lower mold 220, so that a lower adhesive cavity communicated with the liquid inlet 230 is formed between the lower adhesive placing areas of the lower mold 220 and the second frame 150. After the upper mold 210 and the lower mold 220 are closed, the upper surface of the first frame 140 contacts the lower surface of the upper mold 210, and the first frame 140 closes the upper mold cavity of the upper mold 210, so that a glue cavity communicated with the liquid inlet 230 is formed between the upper mold 210 and the glue applying area 141 of the first frame 140.
And S30, filling the flowable sealing ring raw material into the rubber cavity from the liquid inlet 230, so that the sealing ring raw material flows in the rubber cavity and fills the rubber cavity. Optionally, the upper glue cavity and the lower glue cavity are filled with sealing ring raw materials from the liquid inlet 230, so that the sealing ring raw materials flow in the upper glue cavity and the lower glue cavity and fill the upper glue cavity and the lower glue cavity.
In order to make it easier to inject the flowable sealing ring raw material from the liquid inlet 230, optionally, the liquid inlet 230 may be disposed on the upper mold 210, and the liquid inlet 230 penetrates through the upper and lower surfaces of the upper mold 210, and the liquid inlet 230 is provided with an upper liquid inlet groove at a position close to the upper mold cavity, and the depth of the upper liquid inlet groove is consistent with the depth of the upper mold cavity. Further, the liquid inlet 230 further extends to the upper surface of the lower mold 220, a lower liquid inlet groove 222 is also formed in the upper surface of the lower mold 220, the depth of the lower liquid inlet groove 222 on the lower mold 220 is consistent with that of the lower mold cavity 221, the upper liquid inlet groove and the lower liquid inlet groove 222 are correspondingly arranged to form a cavity, the flowable sealing ring raw material is injected from the liquid inlet 230, and flows into the cavity formed by combining the upper liquid inlet groove and the lower liquid inlet groove 222 and then flows into the gluing cavity and the lower gluing cavity respectively, so that the gluing cavity and the lower gluing cavity are filled with the sealing ring raw material.
Optionally, a plurality of liquid inlets 230 may be provided, as shown in fig. 5, two liquid inlets 230 are provided, so as to improve the preparation efficiency of the sealing ring. In other embodiments, the liquid inlet 230 may be disposed on a side surface of the upper mold 210, and the like, as long as the liquid inlet 230 can be communicated with the glue cavity and the glue injection is realized within the protection scope of the present application. In the embodiment of the application, the flowable raw material of the sealing ring can be a liquid raw material of the sealing ring or a semi-solid raw material of the sealing ring. The raw materials which can be used as the sealing ring and can flow in the rubber cavity and be filled with the rubber cavity are all within the protection scope of the application.
Optionally, after injecting the flowable sealing ring material, and before curing the sealing ring material, the step of preheating the mold 200 is further included. The raw material of the filled sealing ring can be enabled to have better fluidity in the rubber cavity, so that the rubber cavity can be filled with the raw material more easily, the preparation efficiency is improved, and the raw material is prevented from being solidified in the flowing process.
In one possible embodiment, the mold 200 is preheated to a temperature of 100-160 ℃ prior to placement of the membrane electrode 100 for subsequent gasket preparation. Alternatively, the preheating method of the mold 200 may be: the mold 200 is placed in a high temperature furnace for preheating.
In some possible embodiments, the preheating target temperature of the mold 200 may be 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ or 160 ℃. In other embodiments, if the flowability of the raw material for preparing the sealing ring is good, the mold 200 may not be preheated, and the application is not limited thereto.
S40, curing the raw materials of the sealing ring, and forming the sealing ring on the glue placing area. Alternatively, an upper seal ring 160 is formed on the upper glue placement area 141 and a lower seal ring is formed on the lower glue placement area. In the embodiment of the present application, the raw material of the sealing ring is thermoplastic and thermosetting elastomer polymer, and the adhesion force between the sealing ring and the membrane electrode 100 is greater than the adhesion force between the sealing ring and the mold 200. The sealing ring can be more easily demoulded on the mould 200, demoulding can be realized without using a demoulding agent, and the preparation is simpler.
In the embodiment of the application, the material of the sealing ring is selected from one or more of ethylene propylene diene monomer, silicone rubber, polyurethane, polyacrylate and polyisobutylene. Standing at room temperature for 3-30min to realize curing of the sealing ring raw material. In some possible embodiments, the time required to stand the mold 200 at room temperature after injecting the glue is 3min, 5min, 10min, 20min or 30min.
Optionally, the width of the sealing ring is 2-5mm, so that the contact area between the sealing ring and the membrane electrode 100 and the bipolar plate can be ensured, the sealing effect of the sealing ring is good, and the size of the product is prevented from being influenced.
Further, as shown in fig. 4, the sealing ring on the membrane electrode 100 is a long strip structure, so that if a dispenser is used to prepare the adhesive tape, the uniformity of the adhesive tape is not easy to be ensured. In this application, use the preparation that mould 200 cooperations carried out the sealing washer, can make the homogeneity of adhesive tape better, the preparation effect of sealing washer is better.
And S50, taking out the membrane electrode 100 with the sealing ring. The upper mold 210 is separated from the lower mold 220, and the membrane electrode 100 with the seal ring is taken out.
The preparation method provided by the embodiment of the application can enable the uniformity and the flatness of the sealing ring to be better. By using the mold 200, mass production is easily achieved. The upper sealing ring 160 and the lower sealing ring can be prepared at one time, and the production efficiency is improved. The shape of the die cavity on the die 200 is matched with the shape of the frame on the membrane electrode 100, so that the sealing ring can be prepared for different types of membrane electrodes 100.
Example 2
Fig. 7 is a second flowchart of a method for manufacturing a sealing structure on a membrane electrode 100 according to an embodiment of the present application, and fig. 8 is a cross-sectional view of the sealing structure on the membrane electrode 100 according to the embodiment of the present application. Referring to fig. 7 and fig. 8, the present embodiment also provides a method for preparing a sealing structure on a membrane electrode 100, the present embodiment is an improvement on the basis of the technical solution of embodiment 1, the technical solution described in embodiment 1 is also applicable to the present embodiment, the technical solution disclosed in embodiment 1 is not described again, and the present embodiment differs from embodiment 1 in that: before the framed membrane electrode 100 is placed in the mold 200, a layer of adhesive is applied to the adhesive placement area of the frame, and then the adhesive is cured to form the adhesive layer 170 for limiting the slip of the seal ring. The adhesive force of the sealing ring on the frame is increased, the sealing ring is prevented from sliding when being extruded, and the fixing effect between the bipolar plate and the membrane electrode 100 is better; and the bonding force between the sealing ring and the membrane electrode 100 is further increased, so that the sealing ring is easier to demould from the mould 200.
Optionally, a layer of adhesive is coated on the upper adhesive placing area 141 of the upper surface of the frame (the adhesive placing area of the surface of the first frame 140 facing away from the second frame 150), the adhesive is cured to form an upper adhesive layer 170, then a layer of adhesive is coated on the lower adhesive placing area of the lower surface of the frame (the adhesive placing area of the surface of the second frame 150 facing away from the first frame 140), and then the adhesive is cured to form a lower adhesive layer 170, so that the upper adhesive layer 170 is formed on the upper surface of the first frame 140 of the membrane electrode 100, and the lower adhesive layer 170 is formed on the lower surface of the second frame 150.
The membrane electrode 100 with the adhesive layer 170 formed thereon is then placed in a mold 200 to form a seal ring. The width of the adhesive layer 170 is smaller than the width of the sealing ring, and the sealing ring covers the adhesive layer 170. When the membrane electrode 100 and the bipolar plate are assembled, when the membrane electrode 100 and the bipolar plate are mutually pressed, three surfaces of the sealing ring can be pressed (as shown in fig. 8, the upper surface and two outer side surfaces of the sealing ring can be pressed and deformed to seal the membrane electrode 100 and the bipolar plate), the membrane electrode 100 and the bipolar plate can be completely separated through the sealing ring, partial areas between the membrane electrode 100 and the bipolar plate are prevented from being separated through the bonding layer 170, and the assembly sealing effect between the membrane electrode 100 and the bipolar plate is better.
Further, the width of the adhesive layer 170 is 1.4-4.6mm, and the width of the sealing ring is 2-5mm. The width of the adhesive layer 170 is smaller than that of the sealing ring, so that the adhesive force between the sealing ring and the frame can be improved in the bonding effect, and the sliding of the sealing ring can be avoided, and the sliding of the sealing ring can be structurally limited by the structure of the adhesive layer 170 (as shown in fig. 8, the left and right movement of the sealing ring is avoided), so that the assembly sealing effect between the membrane electrode 100 and the bipolar plate is better.
In the embodiment of the application, the material of the adhesive is selected from one or more of tetrabutyl titanate, hexamethyl disiloxane, ethyl orthosilicate, trimethyl tert-butyl peroxide silane and vinyl triacetoxy silane, and the adhesive is cured by the following modes: standing at room temperature for 15-60min. The curing is carried out at normal temperature, and the curing mode of the adhesive is simple and easy to realize.
In another embodiment, the adhesive material is selected from one or more of gamma-methacryloxypropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and propenyl-trimethoxysilane, and the adhesive is cured by: curing at 50-180 deg.C for 3-15min. The curing speed of the adhesive can be increased, and the preparation efficiency can be higher.
The preparation method provided by the embodiment of the application can enable the sealing ring to be firmly attached to the frame, and the sliding of the sealing ring in the assembling process is avoided.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
Claims (4)
1. The preparation method of the sealing structure on the membrane electrode is characterized by matching with a mold to prepare, wherein the mold is provided with a mold cavity and a liquid inlet communicated with the mold cavity; the membrane electrode comprises a frame, the frame is provided with a glue placing area, and the preparation method comprises the following steps:
placing the membrane electrode with the frame in the mold, and enabling a mold cavity of the mold and the glue placing area to enclose a glue cavity communicated with the liquid inlet;
filling flowable sealing ring raw materials into the rubber cavity from the liquid inlet, so that the sealing ring raw materials flow in the rubber cavity and fill the rubber cavity;
solidifying the raw material of the sealing ring, forming the sealing ring on the gel placing area, and taking out the membrane electrode with the sealing ring; the raw material of the sealing ring is thermoplastic and thermosetting elastomer polymer, and the bonding force between the sealing ring and the membrane electrode is greater than that between the sealing ring and the mould;
before the membrane electrode with the frame is placed in the mold, the method further comprises the following steps: coating a layer of adhesive on the adhesive placing area of the frame, and then curing the adhesive to form an adhesive layer for limiting the sliding of the sealing ring;
the width of the bonding layer is smaller than that of the sealing ring, the width of the bonding layer is 1.4-4.6mm, and the width of the sealing ring is 2-5 mm;
before solidifying the sealing washer raw materials, still include: preheating the mold; before the membrane electrode with the frame is placed in the mold, preheating the mold to the temperature of 100-160 ℃;
the adhesive is made of one or more materials selected from tetrabutyl titanate, hexamethyl disiloxane, ethyl orthosilicate, trimethyl tert-butyl peroxide silane and vinyl triacetoxy silane, and the adhesive is cured by the following modes: standing at room temperature for 3-30 min; or the material of the adhesive is selected from one or more of gamma-methacryloxypropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane and propenyl trimethoxysilane, and the adhesive is cured by the following modes: curing at 50-180 deg.C for 3-15min.
2. The preparation method of claim 1, wherein the raw material of the sealing ring is selected from one or more of ethylene propylene diene monomer, silicone rubber, polyurethane, polyacrylate and polyisobutylene, and the mode of curing the raw material of the sealing ring is as follows: standing at room temperature for 15-60min.
3. The production method according to claim 1 or 2, wherein the mold comprises an upper mold having an upper cavity and a lower mold having a lower cavity, and the liquid inlet communicates with both the upper cavity and the lower cavity; the upper surface of the frame is provided with an upper glue placing area, and the lower surface of the frame is provided with a lower glue placing area; the preparation method comprises the following steps:
placing the membrane electrode with the frame on the lower die, so that the lower die cavity and the lower glue placing area enclose a lower glue cavity communicated with the liquid inlet, and the upper die and the lower die are closed, so that the upper die cavity and the upper glue placing area enclose an upper glue cavity communicated with the liquid inlet;
sealing ring raw materials are filled into the upper rubber cavity and the lower rubber cavity from the liquid inlet, so that the sealing ring raw materials flow in the upper rubber cavity and the lower rubber cavity and fill the upper rubber cavity and the lower rubber cavity;
solidifying the sealing ring raw materials, forming an upper sealing ring on the upper rubber placing area, forming a lower sealing ring on the lower rubber placing area, and taking out the membrane electrode with the upper sealing ring and the lower sealing ring.
4. A method for hermetically connecting a membrane electrode and a bipolar plate, characterized in that the sealing ring is formed on the frame of the membrane electrode by the manufacturing method of any one of claims 1 to 3;
and placing the surface of the sealing ring, which is deviated from the frame, in the sealing groove of the bipolar plate to enable the bipolar plate to be in sealing connection with the membrane electrode.
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| CN202010625156.4A CN111730803B (en) | 2020-06-30 | 2020-06-30 | Preparation method of sealing structure and sealing connection method of membrane electrode and bipolar plate |
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| CN112909288A (en) * | 2021-01-15 | 2021-06-04 | 苏州泰仑电子材料有限公司 | Membrane electrode structure for fuel cell and preparation method |
| CN113815176B (en) * | 2021-11-22 | 2022-02-22 | 北京新研创能科技有限公司 | Sealing washer grabbing device, grasping system and sealing washer shaping assembly system |
| CN114551927B (en) * | 2021-12-21 | 2022-12-06 | 武汉众宇动力***科技有限公司 | Membrane electrode assembly for proton exchange membrane fuel cell and glue injection sealing method thereof |
| CN114566672A (en) * | 2022-03-03 | 2022-05-31 | 陈晓燕 | Manufacturing method of fuel cell metal bipolar plate sealing structure |
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