CN116259764A - Flexible graphite polar plate cleaning device with stress compensation function and application method thereof - Google Patents
Flexible graphite polar plate cleaning device with stress compensation function and application method thereof Download PDFInfo
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- CN116259764A CN116259764A CN202310178679.2A CN202310178679A CN116259764A CN 116259764 A CN116259764 A CN 116259764A CN 202310178679 A CN202310178679 A CN 202310178679A CN 116259764 A CN116259764 A CN 116259764A
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- flexible graphite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to a flexible graphite polar plate cleaning device with stress compensation and a use method thereof, wherein the device comprises a curing unit and a stress compensation component, the curing unit comprises an upper screen mesh plate (2) and a lower screen mesh plate (4), a flexible graphite polar plate (3) is arranged between an upper screen mesh (22) of the upper screen mesh plate (2) and a lower screen mesh (42) of the lower screen mesh plate (4), the stress compensation component is an electromagnet (1), and the electromagnet (1) is suspended outside the upper screen mesh (22); the upper silk screen (22) is made of metastable austenitic stainless steel or steady austenitic stainless steel, and the lower silk screen (42) is made of ferrite stainless steel; the outer side surfaces of the upper silk screen (22) and the lower silk screen (42) are fixed with an upper frame (21) and a lower frame (41). Compared with the prior art, the invention realizes stress compensation of the mesh plate under the condition of no reinforcing rib design, and greatly improves the service time of the high-tension mesh plate.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and relates to a flexible graphite polar plate cleaning device with stress compensation and a using method thereof.
Background
Flexible graphite is considered to be the most likely material to be applied to fuel cell plates in batches due to its excellent formability, thermal conductivity, electrical conductivity and low price, thereby attracting a large number of enterprises and scientific research institutes to develop flexible graphite plates. In the traditional process, a cleaning basket used after impregnation is usually in the form of parting strips, a large number of hollowed-out parts exist, and the design easily causes the polar plate to be damaged in the cleaning process.
Based on this, a pair of high tension stainless steel mesh plates can be used to constrain the immersed monopolar plates for cleaning. It is known that the screen tension is reduced by the occurrence of stress relaxation phenomenon. In order to compensate the tension, the conventional scheme can use structural design, and reinforcing ribs are added on the back of the screen plate to reduce the influence of stress relaxation. However, the method of using the reinforcing ribs increases the contact surface between the polar plate and the reinforcing ribs, which causes the polar plate to be separated out of resin in the water bath curing process and cured on the surface of the polar plate, resulting in scrapping of the polar plate.
Patent CN114927702a discloses a device for cleaning residual resin of fuel cell mould pressing graphite plate, including hot water tank, electric block, flooding basket and push-and-pull module, the flooding basket hangs in the top of hot water tank through electric block, and the flooding basket is submerged into the hot water tank downwards under electric block's drive, and push-and-pull module includes motor, crank and push rod, and the motor is located one side of hot water tank, and the crank is installed on the output shaft of motor, and the crank is connected to push rod one end, and the cable of electric block is connected to the other end. However, the cleaning basket of the patent has no constraint effect on the polar plate, the resin is not cured in the cleaning state of the polar plate, and the polar plate is extremely soft and is easy to damage.
Patent CN115106319a discloses a tool and a method for cleaning flexible graphite polar plates of fuel cells, which comprises a fixed frame and a plurality of hollowed-out net frames which are detachably arranged in the fixed frame and used for fixing the flexible graphite polar plates; the hollow net frame comprises a pair of hollow net plates which are arranged in parallel, a plurality of cleaning through holes which are formed in the side surfaces of the hollow net plates in a penetrating mode, and limiting division bars which are arranged between the hollow net plates and are positioned at the edges of the hollow net plates; the flexible graphite polar plate is clamped and fixed between the pair of hollowed-out net plates, and the periphery of the flexible graphite polar plate is limited and fixed through limiting parting strips. But the net plate of the patent is stainless steel, aluminum alloy or plastic net plate with the thickness of 1-3mm, the weight of the stainless steel or aluminum alloy net plate is large, and the plastic net plate is low in reliability and easy to damage although the weight of the plastic net plate is greatly reduced; in addition, the hollowed-out mode of the patent cannot uniformly restrict the surface of the polar plate, and the hollowed-out position is easy to damage the polar plate in an uncured state of resin.
Disclosure of Invention
The invention aims to overcome at least one defect in the prior art and provide a flexible graphite polar plate cleaning device with stress compensation and a use method thereof.
The aim of the invention can be achieved by the following technical scheme:
the invention provides a flexible graphite polar plate cleaning device with stress compensation, which comprises a curing unit and a stress compensation component, wherein the curing unit is a pair of high-tension stainless steel mesh plates with the same mesh number and tension and comprises an upper mesh plate and a lower mesh plate, a flexible graphite polar plate to be cleaned after being immersed is arranged between the upper mesh of the upper mesh plate and the lower mesh of the lower mesh plate, the curing unit is fixed by utilizing an edge locking structure, and the stress compensation component is an electromagnet which is suspended outside the upper mesh plate.
Further, the upper silk screen material is metastable austenitic stainless steel or steady state austenitic stainless steel, and the lower silk screen material is ferrite stainless steel.
Further, the metastable austenitic stainless steel includes 301, 301L, 304L, 316 or 316L, the steady state austenitic stainless steel includes 310 or 310L, and the ferritic stainless steel includes 430 or 441.
Further, the mesh number of the upper silk screen and the lower silk screen is 50-200 meshes, and the tension is 15-40N.
Further, the outer side surfaces of the upper silk screen and the lower silk screen are fixed with an upper frame and a lower frame.
Further, the upper frame and the lower frame are made of aluminum alloy or stainless steel, the thickness is 1-30mm, and the width is 5-50mm.
As a preferable technical scheme, the inner dimension of the frame depends on the dimension of the restrained flexible graphite polar plate, the length is 400-600mm, and the width is 200-350mm.
Further, the distance between the upper wire mesh and the upper frame joint surface of the electromagnet lower surface is 100-500mm, and the electromagnet fixing area is characterized in that an austenitic stainless steel upper wire mesh and a flexible graphite polar plate are arranged between the electromagnet and the lower frame joint surface of the ferritic stainless steel lower wire mesh, so that the ferritic stainless steel lower wire mesh is ensured to be subjected to magnetic force applied to the direction of the flexible graphite polar plate.
Further, the electromagnetic ferromagnetic field strength is 0.05-0.8T.
One of the technical schemes of the invention is to provide a using method of a flexible graphite polar plate cleaning device with stress compensation, which comprises the following steps:
(1) Fixing an upper silk screen on an upper frame to prepare an upper silk screen plate;
(2) Fixing a lower silk screen with the same mesh number as the step on a lower frame by using the same process to prepare a lower silk screen plate, so as to ensure that the tension of the silk screen is the same as the step;
(3) Placing a lower silk screen and a lower frame bonding surface downwards, placing a immersed flexible graphite polar plate to be cleaned above the lower silk screen, then using the other upper silk screen and an upper frame bonding surface to cover the upper surface of the flexible graphite polar plate upwards, forming a curing unit, and fixing the curing unit by utilizing an edge locking structure;
(4) The electromagnet is suspended above the joint surface of the upper silk screen and the upper frame, and a cleaning device is formed by the electromagnet and the curing unit, and the magnetic field intensity of the electromagnet is adjusted to control the stress compensation of the lower mesh plate;
(5) And (3) placing the dipped flexible graphite polar plate added by the curing unit in water for cleaning, keeping the liquid level higher than the upper surface of the curing unit, preventing the electromagnet from contacting with the liquid level above the liquid level, and taking out the flexible graphite polar plate after cleaning.
As a preferable technical scheme, the fixing mode of the silk screen and the frame is brushing, bonding, welding or pressing.
Further, the distance between the liquid level and the upper surface of the curing unit is 100-200mm, and the cleaning time is 5-30min.
Since the austenite and epsilon martensite phases are paramagnetic phases, the alpha' martensite and ferrite are ferromagnetic phases; all the steady-state austenitic stainless steel is austenite, and epsilon martensite and alpha' martensite generated by cold working exist in the metastable austenitic stainless steel, but the content is extremely low; therefore, the electromagnet has no effect on the austenitic stainless steel wire mesh at all, has little effect on metastable austenitic stainless steel, and can generate obvious magnetic force on ferritic stainless steel. The curing assembly is used for cleaning the flexible graphite polar plate with stress compensation, so that long-term service conditions of the tool assembly can be met, and the service life of the tool is greatly prolonged.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the characteristics of paramagnetic property of the austenitic stainless steel wire mesh and ferromagnetic property of the ferritic stainless steel wire mesh are utilized, and the magnetic force is utilized to perform stress compensation on the metal wire mesh, so that the mesh plate is prevented from generating obvious stress relaxation during long-term water bath operation;
(2) The invention uses a non-contact stress compensation method, avoids the stress compensation design of the traditional reinforcing ribs, and avoids the surface resin precipitation caused by the contact of the polar plate and the reinforcing ribs, thereby avoiding the scrapping of the polar plate.
Drawings
Fig. 1 is a schematic structural diagram of a device for cleaning a flexible graphite plate with stress compensation in an embodiment of the invention.
The figure indicates:
1-electromagnet, 2-upper screen mesh plate, 21-upper frame, 22-upper screen mesh, 3-flexible graphite polar plate, 4-lower screen mesh plate, 41-lower frame and 42-lower screen mesh.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying positive importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples:
as shown in figure 1, a curing unit is combined with a stress compensation component to clean a flexible graphite polar plate 3 with thickness of 1mm, length of 350mm and width of 180mm after being immersed, and the specific steps are as follows:
the first step: using a 316L metastable austenitic stainless steel upper screen 22 with the mesh number of 50 meshes and 6063 aluminum alloy with the thickness of 20mm, the width of 30mm, the inner dimension length of 500mm of a frame and the inner dimension width of 300mm of the frame as an upper frame 21, and fixing the screen on the frame by a pressing mode to prepare an austenitic stainless steel upper screen mesh plate 2 with the tension of 35N;
and a second step of: using a lower ferritic stainless steel screen 42 with the mesh number of 50 meshes and a 6063 aluminum alloy with the thickness of 20mm, the width of 30mm, the inner dimension length of 500mm of the frame and the inner dimension width of 300mm of the frame as a lower frame 41, and fixing the screen on the frame by a pressing mode to prepare a lower ferritic stainless steel screen plate 4 with the tension of 35N;
and a third step of: the front surface of an austenitic stainless steel upper screen mesh plate 2 is opposite to the front surface (non-frame joint surface) of a ferritic stainless steel lower screen mesh plate 4, a flexible graphite polar plate 3 to be cleaned is placed in the center of the austenitic stainless steel upper screen mesh plate, a curing unit is formed by the parts, and the curing unit is locked by locking nuts;
fourth step: the electromagnet 1 is used as a stress compensation component and is fixed at the position, which is 350mm away from the back surface (frame joint surface) of the austenitic stainless steel upper screen mesh plate 2, of the lower surface of the electromagnet 1 to form a cleaning device, a power supply is connected, and the magnetic field intensity of the electromagnet is controlled to be 0.3T;
fifth step: placing the curing unit in deionized water, keeping the liquid level higher than the upper surface of the curing unit by 120mm, keeping the electromagnet 1 above the liquid level from contacting the liquid level, and taking out the flexible graphite polar plate after cleaning for 15 min.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. The device is characterized by comprising a curing unit and a stress compensation component, wherein the curing unit comprises an upper screen plate (2) and a lower screen plate (4), a flexible graphite polar plate (3) is arranged between an upper screen (22) of the upper screen plate (2) and a lower screen (42) of the lower screen plate (4), the stress compensation component is an electromagnet (1), and the electromagnet (1) is suspended outside the upper screen (22).
2. The device for cleaning a flexible graphite plate with stress compensation according to claim 1, wherein the upper wire mesh (22) is made of metastable austenitic stainless steel or steady state austenitic stainless steel, and the lower wire mesh (42) is made of ferritic stainless steel.
3. The apparatus of claim 2, wherein the metastable austenitic stainless steel comprises 301, 301L, 304L, 316 or 316L, the steady state austenitic stainless steel comprises 310 or 310L, and the ferritic stainless steel comprises 430 or 441.
4. The device for cleaning flexible graphite electrode plates with stress compensation according to claim 1, wherein the mesh number of the upper silk screen (22) and the lower silk screen (42) is 50-200 mesh, and the tension is 15-40N.
5. The device for cleaning the flexible graphite polar plate with stress compensation according to claim 1, wherein the outer side surfaces of the upper silk screen (22) and the lower silk screen (42) are fixedly provided with an upper frame (21) and a lower frame (41).
6. The device for cleaning the flexible graphite polar plate with stress compensation according to claim 5, wherein the upper frame (21) and the lower frame (41) are made of aluminum alloy or stainless steel, have a thickness of 1-30mm and a width of 5-50mm.
7. A device for cleaning flexible graphite plates with stress compensation according to claim 1, characterized in that the electromagnet (1) is 100-500mm away from the upper wire mesh (22).
8. The device for cleaning the flexible graphite polar plate with stress compensation according to claim 1, wherein the magnetic field intensity of the electromagnet (1) is 0.05-0.8T.
9. A method of using the stress-compensated flexible graphite plate cleaning apparatus of any one of claims 1 to 8, the method comprising the steps of:
(1) Fixing an upper silk screen (22) on an upper frame (21) to prepare an upper silk screen plate (2);
(2) Fixing a lower silk screen (42) on a lower frame (41) to prepare a lower silk screen plate (4);
(3) Placing the lower silk screen (42) and the lower frame (41) in a bonding surface downward manner, horizontally placing the flexible graphite polar plate (3) above the lower silk screen (42), and then using the upper silk screen (22) and the upper frame (21) in a bonding surface upward manner to cover the upper surface of the flexible graphite polar plate (3);
(4) Suspending the electromagnet (1) above the joint surface of the upper silk screen (22) and the upper frame (21), and adjusting the magnetic field intensity of the electromagnet (1);
(5) And (3) holding the flexible graphite polar plate (3) by the curing unit, placing the flexible graphite polar plate in water for cleaning, keeping the liquid level higher than the upper surface of the curing unit, and taking out the flexible graphite polar plate (3) after cleaning.
10. The method of claim 9, wherein the distance between the liquid surface and the upper surface of the solidifying unit is 100-200mm, and the cleaning time is 5-30min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178679.2A CN116259764A (en) | 2023-02-28 | 2023-02-28 | Flexible graphite polar plate cleaning device with stress compensation function and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178679.2A CN116259764A (en) | 2023-02-28 | 2023-02-28 | Flexible graphite polar plate cleaning device with stress compensation function and application method thereof |
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| CN116259764A true CN116259764A (en) | 2023-06-13 |
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| CN202310178679.2A Pending CN116259764A (en) | 2023-02-28 | 2023-02-28 | Flexible graphite polar plate cleaning device with stress compensation function and application method thereof |
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| CN (1) | CN116259764A (en) |
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- 2023-02-28 CN CN202310178679.2A patent/CN116259764A/en active Pending
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