CN114824354B - Method for preparing single cell of fuel cell - Google Patents
Method for preparing single cell of fuel cell Download PDFInfo
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- CN114824354B CN114824354B CN202210594753.4A CN202210594753A CN114824354B CN 114824354 B CN114824354 B CN 114824354B CN 202210594753 A CN202210594753 A CN 202210594753A CN 114824354 B CN114824354 B CN 114824354B
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- 239000000446 fuel Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 27
- 238000007789 sealing Methods 0.000 claims abstract description 83
- 238000007650 screen-printing Methods 0.000 claims abstract description 41
- 239000003292 glue Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000012528 membrane Substances 0.000 claims abstract description 28
- 239000000565 sealant Substances 0.000 claims abstract description 25
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 229920002379 silicone rubber Polymers 0.000 claims description 42
- 238000004519 manufacturing process Methods 0.000 claims description 23
- 239000004944 Liquid Silicone Rubber Substances 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 18
- 239000004945 silicone rubber Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000013040 rubber vulcanization Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 229920001971 elastomer Polymers 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000012356 Product development Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
-
- 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
-
- 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
-
- 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
- H01M8/028—Sealing means characterised by their material
- H01M8/0284—Organic resins; Organic polymers
Abstract
The invention discloses a preparation method of a single cell of a fuel cell, which comprises the following steps: screen printing is carried out at the position of a sealing groove at the water cavity side of the anode plate so as to form a water cavity sealing glue line; screen printing is carried out in the sealing groove at the air cavity side of the cathode plate and the sealing groove at the air cavity side of the anode plate to form an air cavity sealant line; the limiting plates are respectively arranged between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode; the assembly of the single cells is completed by curing. The invention can fill the processing error of the sealing groove of the polar plate through the thickness tolerance of the sealing glue line, so that the carbon paper is completely and completely contacted with the runner of the reaction area, the contact resistance in the pile is thoroughly reduced, and the thickness of the sealing glue line can be changed by controlling the thickness of the limiting plate, thereby achieving the ideal contact resistance of the whole pile.
Description
Technical Field
The invention relates to a preparation method of a single cell of a fuel cell.
Background
In the prior art, there are three sealing modes of fuel cells, one is to add a sealing glue line or a sealing gasket on an anode plate and a cathode plate of a bipolar plate of the fuel cell, one is to form an elastic sealing layer on the surface of the plate by using liquid silica gel through injection molding, and the other is to form the elastic sealing layer by using a dispensing mode. The sealing method has the problems of infirm bonding of the sealing glue line, sliding dislocation, high die cost, immature process, nonuniform glue line size, easy sealing failure and the like.
Disclosure of Invention
The invention aims to overcome the defects of weak bonding, sliding dislocation, high die cost, immature process, nonuniform size of a sealing line and easy sealing failure existing in the sealing method in the prior art.
The invention solves the technical problems by the following technical scheme:
the invention discloses a preparation method of a single cell of a fuel cell, which comprises the following steps: screen printing is carried out at the position of a sealing groove at the water cavity side of the anode plate so as to form a water cavity sealing glue line; screen printing is carried out in the sealing groove at the air cavity side of the cathode plate and the sealing groove at the air cavity side of the anode plate to form an air cavity sealant line; respectively placing limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode; the assembly of the single cells is completed by curing.
In the scheme, the screen printing process can provide reliable sealing performance, the thickness and the width of the glue line are uniform and consistent, the pattern design can be flexible and changeable, the adaptability of the glue is strong, and the automatic production is facilitated in the later period of product development. The water cavity adopts a rubber sealing mode, so that corrosion of the metal plate in the welding process is prevented; the air cavity adopts a bonding sealing mode, so that the sliding and air leakage risks of the rubber line are avoided, and the sealing performance of the air cavity is improved. By adopting the structural form, the machining error of the sealing groove of the polar plate can be filled through the thickness tolerance of the sealing glue line, so that the carbon paper is completely and completely contacted with the flow passage of the reaction area, the contact resistance in the pile is thoroughly reduced, and the thickness of the sealing glue line can be changed by controlling the thickness of the limiting plate, so that the ideal contact resistance of the whole pile is achieved.
Preferably, before the step of placing the limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode, respectively, the preparation method further includes: selecting a sheet; and manufacturing the sheet into the limiting plate matched with the membrane electrode frame.
In the scheme, the thickness of the glue line can be quickly adjusted through the thickness of the thin sheet, and the thickness of the glue line after silk-screen printing is not required accurately. By adopting the structure, the sealing glue line has the advantages of simple production process and low production cost, and can flexibly match the early thickness of the galvanic pile, thereby ensuring that the sealing glue line can reach the ideal thickness.
Preferably, the step of screen printing at the seal groove position on the water cavity side of the anode plate to form a water cavity sealant line includes: selecting liquid silicone rubber; performing screen printing at the position of a sealing groove at the water cavity side of the anode plate; and (3) performing a silicone rubber vulcanization molding process on the silicone rubber subjected to screen printing to form a water cavity sealant line.
In the scheme, the water cavity sealing adopts the screen printing mode by adopting the structural form, so that the metal plate is prevented from being corroded in the welding process.
Preferably, the step of screen printing in both the air cavity side seal groove of the cathode plate and the air cavity side seal groove of the anode plate to form an air cavity sealant line includes: selecting a steel wire mesh plate and placing the steel wire mesh plate on a silk screen printing machine tool; placing the surface of a sealing groove at the air cavity side of the anode plate into a tool for fixing, and aligning the pattern of the sealing groove with the pattern of the screen plate; selecting liquid silicone rubber and completely mixing the liquid silicone rubber; placing the mixed liquid silicone rubber into a vacuum defoaming box for defoaming, and then placing the liquid silicone rubber above the screen plate pattern; selecting a scraper, and pressing the scraper against the screen plate printed with the screen plate pattern to enable the silicon rubber to pass through the screen plate pattern position to finish screen printing of the anode plate; and replacing the cathode plate, and repeating the steps.
In the scheme, the air cavity adopts a silicon rubber bonding sealing mode, so that the risks of sliding of a rubber line and air leakage are avoided, and the sealing reliability is improved. By adopting the structural form, the sealing performance and the bonding performance of the silicone rubber are fully utilized.
Preferably, the step selects a doctor blade, and presses the doctor blade against the screen plate printed with the screen plate pattern so that the silicone rubber passes through the screen plate pattern, wherein the hardness of the doctor blade is 65A-90A, the moving speed of the doctor blade is 80mm/sec-150mm/sec, and the angle of the doctor blade is 13-20 degrees.
Preferably, the thickness of the air cavity sealant line is proportional to the number of screen printing.
Preferably, the step of completing the assembly of the single cells by curing comprises: spreading the cathode plate, the limiting plate, the membrane electrode, the limiting plate and the anode plate in the single cell die in sequence; vulcanizing and forming the single cell die through a rubber vulcanization process; and taking out the limiting plate to complete the assembly of the single cell.
Preferably, the step of vulcanization molding the single cell mold by the rubber vulcanization process includes: a heating area is arranged at the position of the water cavity sealant line in the single cell die; and setting a cold area region at a proton exchange position in the single cell die.
Preferably, the step is that the pressure in the heating area is set to be 0.5MPA-2MPA at the position of the water cavity sealant line in the single cell die, the temperature is 90-150 ℃, and the heating curing time is 5-30min; and/or setting the temperature in a cold zone area of the proton exchange position in the single cell die to be below 50 ℃.
Preferably, the step of completing the assembly of the single cells by curing comprises: spreading the cathode plate, the limiting plate, the membrane electrode, the limiting plate and the anode plate in the single cell die in sequence; curing at room temperature under a pressure of 0.1MPA-1 MPA; and taking out the limiting plate to complete the assembly of the single cell.
The invention has the positive progress effects that:
the screen printing process can provide reliable sealing performance, the thickness and the width of the glue line are uniform and consistent, the pattern design can be flexible and changeable, the adaptability of the glue is strong, and the automatic production is facilitated in the later period of product development. The water cavity adopts a rubber sealing mode, so that corrosion of the metal plate in the welding process is prevented; the air cavity adopts a bonding sealing mode, so that the sliding and air leakage risks of the rubber line are avoided, and the sealing performance of the air cavity is improved. By adopting the structural form, the machining error of the sealing groove of the polar plate can be filled through the thickness tolerance of the sealing glue line, so that the carbon paper is completely and completely contacted with the flow passage of the reaction area, the contact resistance in the pile is thoroughly reduced, and the thickness of the sealing glue line can be changed by controlling the thickness of the limiting plate, so that the ideal contact resistance of the whole pile is achieved.
Drawings
Fig. 1 is a flowchart of a method of manufacturing a single fuel cell in an embodiment of the invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
The embodiment provides a preparation method of a single cell of a fuel cell, which is used for solving the problems of weak bonding of a sealing glue line, sliding dislocation, high die cost, immature process, nonuniform size of the glue line and easy sealing failure in the sealing method.
As shown in fig. 1, the preparation method comprises:
step S1, screen printing is carried out at the position of a sealing groove at the water cavity side of an anode plate so as to form a water cavity sealant line; specifically, the water cavity is sealed in a screen printing mode, so that the metal plate is prevented from being corroded in the welding process.
When the silicone rubber is specifically used, the sealing performance and the bonding performance of the silicone rubber are fully utilized. The method comprises the steps of selecting a two-component or one-component liquid silicone rubber with the viscosity of 5-15 x 104mPa.S@25 ℃, and carrying out screen printing at the position of a sealing groove at the water cavity side of the anode plate. In other embodiments, the screen printed material may not be limited.
Step S2, screen printing is carried out in a sealing groove at the air cavity side of the cathode plate and a sealing groove at the air cavity side of the anode plate to form an air cavity sealant line; specifically, the air cavity adopts a mode of bonding and sealing by silicone rubber, so that the risks of sliding and air leakage of a rubber line are avoided, and the sealing reliability is improved. The thickness tolerance of the sealant line can make up the curve of the single polar plate with uneven size in the processing process, so that the gas diffusion layer and the reaction area can be fully contacted, and the contact resistance in the electric pile can be optimized. Meanwhile, the production process is simple, the production cost of the die is low, the problem of thickness matching of the galvanic pile in the early stage can be flexibly solved, and the production of large-batch single cells in the later stage is convenient.
S3, respectively placing limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode; specifically, the thickness of the glue line can be quickly adjusted through the thickness of the limiting plate, and the thickness of the glue line after silk-screen printing is not required accurately.
And S4, completing the assembly of the single cells through solidification.
The thickness of the sealant wire is required to be adjusted according to the battery performance while the contact resistance of the electric pile component is effectively reduced under the action of the packaging force, and the thickness of the sealant wire can be changed by controlling the thickness of the limiting plate at any time according to the battery test result, so that the ideal contact resistance of the whole electric pile is achieved. By adopting the structural form, the machining error of the sealing groove of the polar plate can be filled through the thickness tolerance of the sealing glue line, so that the carbon paper is completely and completely contacted with the flow passage of the reaction area, the contact resistance in the pile is thoroughly reduced, and the thickness of the sealing glue line can be changed by controlling the thickness of the limiting plate, so that the ideal contact resistance of the whole pile is achieved. The machining error of the polar plate sealing groove is filled through the thickness tolerance of the sealing glue line, so that the carbon paper is completely and completely contacted with the reaction area flow channel, the phenomenon of poor contact in the pile is thoroughly reduced, the assembly modularization of the pile is realized, the disassembly and the replacement are more convenient, the efficiency is higher, and the method is more suitable for mass production.
Before step S3, the preparation method further includes:
selecting a sheet; specifically, the sheet is made of stainless steel. In other embodiments, the material of the sheet may be of other types, and the thickness of the sheet may be selected according to the corresponding relationship between the thickness of the desired sealant line and the thickness of the limiting plate.
And manufacturing the sheet into the limiting plate matched with the membrane electrode frame. By adopting the structure, the sealing glue line has the advantages of simple production process and low production cost, and can flexibly match the early thickness of the galvanic pile, thereby ensuring that the sealing glue line can reach the ideal thickness.
The step S1 comprises the following steps:
step S11, selecting liquid silicone rubber; specifically, the above form takes advantage of the sealing and bonding properties of silicone rubber.
Step S12, performing screen printing at the position of a sealing groove at the water cavity side of the anode plate;
and S13, performing a silicone rubber vulcanization molding process on the silicone rubber subjected to screen printing to form a water cavity sealant line.
The step S2 comprises the following steps:
s21, selecting a steel wire mesh plate and placing the steel wire mesh plate on a silk screen printing machine tool; specifically, the mesh number of the wire mesh plate is 80-200 meshes, the wire diameter is 50-150 mu m, and the film thickness is 15-100 mu m. In other embodiments, the wire mesh sheet type may not be limited.
S22, placing the surface of a sealing groove at the air cavity side of the anode plate into a tool for fixing, and aligning the pattern of the sealing groove with the pattern of the screen plate; specifically, the seal groove on the air cavity side of the anode plate can be wiped by alcohol.
S23, selecting liquid silicone rubber, and completely mixing the liquid silicone rubber; specifically, a double-component or single-component liquid silicone rubber with the viscosity of 5-15 x 104mPa.S@25 ℃ is selected, and after the liquid rubber is completely mixed, the mixture is placed into a vacuum defoaming box for defoaming and then placed above a screen plate pattern.
S24, placing the mixed liquid silicone rubber into a vacuum defoaming box for defoaming, and then placing the liquid silicone rubber above the screen plate pattern; selecting a scraper, and pressing the scraper against the screen plate printed with the screen plate pattern to enable the silicon rubber to pass through the screen plate pattern position to finish screen printing of the anode plate; specifically, the doctor blade may be a polyurethane doctor blade having a hardness of 65 to 90A, a moving speed of 80mm/sec to 150mm/sec, and an angle of 13 to 20 degrees. The thickness of the air cavity sealant line is proportional to the number of screen printing. That is, the greater the number of blade passes, the thicker the air cavity sealant line thickness. By adopting the structural form, the number of silk-screen printing times is controlled according to the thickness of the required air cavity sealant line.
When the scraper is specifically used, the scraper is positioned above the screen plate, and the area of the scraper is larger than the pattern area of the screen plate.
And S25, replacing the cathode plate, and repeating the steps. And (5) placing for standby after silk screen printing is completed.
The step S4 includes:
step S41, tiling the cathode plate, the limiting plate, the membrane electrode, the limiting plate and the anode plate in the single cell die in sequence;
s42, vulcanizing and forming the single cell die through a rubber vulcanization process; specifically, a heating area is arranged at the relevant position of the sealing glue line of the die, a cooling area is arranged at the relevant position of the proton exchange, and the die is heated and solidified for 5-30min under the pressure of 0.1MPA-1MPA and the temperature of 90-150 ℃; the temperature of the cooling area is set below 50 ℃ to vulcanize the silicon rubber.
And S43, taking out the limiting plate to complete the assembly of the single cell. Specifically, after the rubber is solidified, the limiting plate is taken out.
When the silicone rubber is specifically used, if the silicone rubber is cured at room temperature, the die does not need to be heated and is only cured at room temperature under the pressure of 0.1MPA-1 MPA.
Example 1
And selecting bi-component liquid silicone rubber tile-g silica gel with the viscosity of 5 x 104mPa.S@25 ℃, performing screen printing at the sealing groove position of the water cavity side of the anode plate, and heating and curing for 5min at the temperature of 150 ℃ to form a water cavity sealing gel line.
A wire mesh plate having a mesh number of 200 mesh, a wire diameter of 150 μm and a film thickness of 100 μm was selected and placed on a screen printer tooling.
And wiping the surface of the sealing groove at the air cavity side of the anode plate by alcohol, putting the anode plate into a tool for fixing, and aligning the air cavity sealing platform pattern with the screen plate pattern.
A two-component liquid silicone rubber tile 624 with a viscosity of 5 x 104mpa.s@25 ℃ is selected, and after the glue is completely mixed, the mixture is placed in a vacuum deaeration tank for deaeration and then placed above the screen pattern.
A polyurethane doctor blade was selected with a hardness of 65A. The squeegee pressed against the screen at a speed of 80mm/sec and an angle of 13 degrees and passed the silica gel at the location of the pattern provided. And 3 times of back-printing.
And replacing the cathode single-pole plate, repeating the related steps, and standing for standby after silk-screen printing is finished.
And selecting a stainless steel sheet with the thickness of 0.3mm to manufacture a limiting plate similar to the shape of the frame of the membrane electrode, and respectively placing the limiting plate between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode.
The cathode single-pole plate, the limiting plate, the membrane electrode, the limiting plate and the anode single-pole plate are tiled in the single-cell die in sequence.
A heating area is arranged at the relevant position of the sealing glue line of the die, a cooling area is arranged at the relevant proton exchange area, and the die is heated and solidified for 5min at the temperature of 150 ℃ under the pressure of 0.1 MPA; the temperature of the cooling area is set below 50 ℃ to vulcanize the silicon rubber.
And after the rubber is solidified, taking out the stainless steel limiting plate, and completing the assembly of the single cell.
Example 2
And selecting a bi-component liquid silicone rubber mai-tui silica gel with the viscosity of 7 x 104mPa.S@25 ℃, performing screen printing at the sealing groove position of the water cavity side of the anode plate, and heating and curing for 3min at the temperature of 150 ℃ to form a water cavity sealing gel line.
A wire mesh plate with a mesh number of 150 meshes, a wire diameter of 80 μm and a film thickness of 80 μm was selected and placed on a screen printer tool.
And wiping the surface of the sealing groove at the air cavity side of the anode plate by alcohol, putting the anode plate into a tool for fixing, and aligning the air cavity sealing platform pattern with the screen plate pattern.
A two-component silicone rubber doukangnin single component silica gel having a viscosity of 9 x 104mpa.s@25 ℃ was selected and placed over the screen pattern.
Polyurethane doctor blade was selected with a hardness of 45A. The squeegee was pressed against the screen plate at a speed of 100mm/sec and at an angle of 13 degrees and the silicone gel was passed through the location of the pattern provided. And (5) performing silk screen printing for 2 times.
And replacing the cathode single-pole plate, repeating the related steps, and standing for standby after silk-screen printing is finished.
And selecting a stainless steel sheet with the thickness of 0.2mm to manufacture a limiting plate similar to the shape of the frame of the membrane electrode, and respectively placing the limiting plate between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode.
The cathode single-pole plate, the limiting plate, the membrane electrode, the limiting plate and the anode single-pole plate are tiled in the single-cell die in sequence.
The die does not need to be heated, and can be taken out of the stainless steel limiting plate after the rubber is solidified by only solidifying for 24H at room temperature under the pressure of 0.1MPA, and the single cell assembly is completed.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (8)
1. A method of manufacturing a single fuel cell, comprising:
screen printing is carried out at the position of a sealing groove at the water cavity side of the anode plate so as to form a water cavity sealing glue line;
screen printing is carried out in the sealing groove at the air cavity side of the cathode plate and the sealing groove at the air cavity side of the anode plate to form an air cavity sealant line;
respectively placing limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode;
completing the assembly of the single cells by curing;
the step of placing limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode respectively, and the preparation method further comprises the following steps:
selecting a sheet;
the sheet is made into the limiting plate matched with the membrane electrode frame;
the step of completing the assembly of the single cell by curing comprises:
spreading the cathode plate, the limiting plate, the membrane electrode, the limiting plate and the anode plate in the single cell die in sequence;
vulcanizing and forming the single cell die through a rubber vulcanization process;
taking out the limiting plate to complete the assembly of the single cell;
wherein, through the thickness of control limiting plate change the thickness of sealed glue line.
2. The method of manufacturing a single fuel cell as claimed in claim 1, wherein the step of screen printing at the seal groove position on the water cavity side of the anode plate to form a water cavity sealant line comprises:
selecting liquid silicone rubber;
performing screen printing at the position of a sealing groove at the water cavity side of the anode plate;
and (3) performing a silicone rubber vulcanization molding process on the silicone rubber subjected to screen printing to form a water cavity sealant line.
3. The method of manufacturing a single cell for a fuel cell according to claim 1, wherein the step of screen printing in both the seal groove on the air cavity side of the cathode plate and the seal groove on the air cavity side of the anode plate to form an air cavity sealant line comprises:
selecting a steel wire mesh plate and placing the steel wire mesh plate on a silk screen printing machine tool;
placing the surface of a sealing groove at the air cavity side of the anode plate into a tool for fixing, and aligning the pattern of the sealing groove with the pattern of the screen plate;
selecting liquid silicone rubber and completely mixing the liquid silicone rubber;
placing the mixed liquid silicone rubber into a vacuum defoaming box for defoaming, and then placing the liquid silicone rubber above the screen plate pattern;
selecting a scraper, and pressing the scraper against the screen plate printed with the screen plate pattern to enable the silicon rubber to pass through the screen plate pattern position to finish screen printing of the anode plate;
and replacing the cathode plate, and repeating the steps.
4. The method for producing a single cell for a fuel cell according to claim 3, wherein the step of selecting a doctor blade and pressing the doctor blade against a screen printed with the screen pattern so that a silicone rubber passes through at the position of the screen pattern, the doctor blade having a hardness of 65A to 90A, the doctor blade moving at a speed of 80mm/sec to 150mm/sec, and the doctor blade having an angle of 13 to 20 degrees.
5. A method of manufacturing a fuel cell unit cell according to claim 3, wherein the thickness of the air cavity sealant line is proportional to the number of screen printing.
6. The method for manufacturing a single cell of a fuel cell according to claim 1, wherein the step of vulcanization molding the single cell mold by the rubber vulcanization process comprises:
a heating area is arranged at the position of the water cavity sealant line in the single cell die;
and setting a cold area region at a proton exchange position in the single cell die.
7. The method for manufacturing a single cell of a fuel cell according to claim 6, wherein the step of setting the pressure in the heating area to 0.5MPA-2MPA at 90 ℃ to 150 ℃ for 5min to 30min for the water cavity sealant line position in the single cell mold;
and/or setting the temperature in a cold zone area of the proton exchange position in the single cell die to be below 50 ℃.
8. The method of manufacturing a single cell for a fuel cell according to claim 1, wherein the step of completing the assembly of the single cell by curing comprises:
spreading the cathode plate, the limiting plate, the membrane electrode, the limiting plate and the anode plate in the single cell die in sequence;
curing at room temperature under a pressure of 0.1MPA-1 MPA;
and taking out the limiting plate to complete the assembly of the single cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210594753.4A CN114824354B (en) | 2022-05-27 | 2022-05-27 | Method for preparing single cell of fuel cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210594753.4A CN114824354B (en) | 2022-05-27 | 2022-05-27 | Method for preparing single cell of fuel cell |
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| CN114824354A CN114824354A (en) | 2022-07-29 |
| CN114824354B true CN114824354B (en) | 2023-10-27 |
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