CN112428554A - Carbon felt composite battery pole plate and production method thereof, carbon felt composite calendering equipment and flow battery - Google Patents
Carbon felt composite battery pole plate and production method thereof, carbon felt composite calendering equipment and flow battery Download PDFInfo
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- CN112428554A CN112428554A CN202011178811.2A CN202011178811A CN112428554A CN 112428554 A CN112428554 A CN 112428554A CN 202011178811 A CN202011178811 A CN 202011178811A CN 112428554 A CN112428554 A CN 112428554A
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Classifications
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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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
- H01M4/8647—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites
- H01M4/8657—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites layered
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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
- H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
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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
- H01M4/96—Carbon-based electrodes
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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
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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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
Abstract
The invention provides a carbon felt composite battery pole plate and a production method thereof, carbon felt composite calendering equipment and a flow battery, and relates to the technical field of flow batteries. The production method of the carbon felt composite battery polar plate mainly comprises the steps of carrying out hot-melting extrusion on a polar plate substrate which is in a molten state and carrying out hot pressing on the polar plate substrate and a carbon felt together to obtain the carbon felt composite battery polar plate, wherein the production method realizes the integrated molding of the polar plate substrate and the carbon felt, and the direct fusion of the polar plate substrate and the carbon felt eliminates contact resistance, so that the problem of non-uniform contact resistance is avoided, and the overall resistance can be effectively reduced; in addition, the production method can realize continuous production of the carbon felt composite battery plate, effectively improve the production efficiency and effectively reduce the occurrence of the problem of manual operation errors during assembly. The invention also provides carbon felt composite calendering equipment which is simple in structure and can realize the integrated molding of the polar plate substrate and the carbon felt and the continuous operation of the carbon felt composite polar plate substrate.
Description
Technical Field
The invention relates to the technical field of flow batteries, in particular to a carbon felt composite battery pole plate and a production method thereof, carbon felt composite calendering equipment and a flow battery.
Background
In recent years, with the rapid development of renewable energy industry, the proportion of wind power and photovoltaic power generation on the power generation side is increasing, but due to the inherent intermittency and fluctuation of new energy power generation, a relatively large impact is caused on a power grid, and due to the limited absorption and transmission capacity of the power grid, phenomena such as 'wind/light abandonment' and 'limited power generation' occur. The application of the large-scale energy storage technology provides support and guarantee for the development of renewable energy and smart grid construction, and can play a key role in the fields of improving the quality of electric energy, balancing power load, load shifting, grid auxiliary service and the like. Among them, the flow battery is one of the excellent energy storage technologies. The flow battery is an energy storage battery with low cost, high efficiency and environmental protection, and has the advantages of high energy density and current efficiency, simple and easy operation of the device, long service life, low cost and the like. At present, the mainstream flow batteries mainly comprise all-vanadium flow batteries and zinc-bromine flow batteries, and are mainly applied to the fields of power grid peak shaving, power generation of renewable energy sources such as wind energy and solar energy, electric vehicles and the like. Wherein the all-vanadium redox flow battery is a mature one in the market expansion at present.
The traditional all-vanadium redox flow battery mostly adopts a conductive sheet as an electrode plate, and a carbon felt layer is added between the electrode plate and a diaphragm, so that the functions of effective electric conduction and internal resistance reduction are realized. The influence of the resistivity of a polar plate of the all-vanadium redox flow battery on the battery is divided into two parts: firstly, the self resistance of the polar plate is influenced, namely the direct thickness resistance finally reflects the internal consumption of charge and discharge, so that the voltage of the battery is divided by charge and discharge, and the voltage efficiency of the battery is reduced; secondly, the surface contact resistance of the polar plate: the structure of a single-side electrode of the flow battery is shown in a figure (figure 1), and a carbon felt 2 is arranged between an electrode plate 1 and a diaphragm 3 and plays a role in carrying a reaction medium and realizing electric conduction.
In the running process of the flow battery, current is conducted through the contact of the internal electrolyte and the carbon felt with the pole plate, the carbon felt compaction condition and the pole plate surface condition can influence the contact resistance and the final resistance, and therefore the pole plate is required to have good surface contact conductivity, and therefore good electric energy transfer effect is achieved. Currently, the carbon felt is generally in physical contact with the polar plate. According to experimental determination, the contact resistance can account for 50-70% of the total resistivity; in the flow battery, the carbon felt is in an active state and is mainly fixed in position by a structure. Under the condition of continuous change of liquid flow and cold and hot temperatures, the problems of position movement or local poor contact are easy to occur. The displacement can influence the liquid flow, and the local contact problem can lead to the resistance distribution inequality, influences battery operation effect. Therefore, how to reduce the surface contact resistivity between the carbon felt and the polar plate, thereby reducing the total resistivity to realize higher voltage efficiency is an urgent problem to be solved.
In view of the above, the present invention is particularly proposed to solve at least one of the above technical problems.
Disclosure of Invention
The invention aims to provide a production method of a carbon felt composite battery pole plate, which can realize the integrated molding of a carbon felt and the battery pole plate and eliminate the contact resistance between the carbon felt and the battery pole plate.
The second purpose of the invention is to provide a carbon felt composite battery pole plate which is manufactured by the production method of the carbon felt composite battery pole plate.
The third purpose of the invention is to provide a carbon felt composite calendering device which can realize the integrated production of the carbon felt and a battery pole plate.
The fourth purpose of the invention is to provide a flow battery, which comprises the carbon felt composite battery plate or the carbon felt composite battery plate manufactured by adopting the carbon felt composite calendering equipment.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a production method of a carbon felt composite battery pole plate, which is characterized in that a pole plate base material which is extruded by hot melting and is in a molten state and a carbon felt are hot-pressed together to obtain the carbon felt composite battery pole plate.
Further, on the basis of the technical scheme of the invention, the carbon felts are respectively arranged on two sides of the polar plate base material and are hot-pressed with the polar plate base material in a molten state through a press roller to obtain the polar plate of the carbon felt composite battery;
preferably, the hot pressing temperature is 85-95 ℃.
Further, on the basis of the technical scheme, the polar plate base material is subjected to hot melting extrusion by an extruder to form a sheet, and the carbon felt is unreeled by an unreeling roller;
the extrusion sheet-out speed of the polar plate base material is consistent with the unreeling speed of the carbon felt.
Further, on the basis of the technical scheme of the invention, the extrusion temperature of hot melt extrusion is 160-210 ℃, and the rotating speed of an extruder is 200-250 rpm;
and/or the damping torque of the unwinding roller is 10-15 kg.
The invention provides a carbon felt composite battery pole plate which is manufactured by the production method of the carbon felt composite battery pole plate.
The invention provides carbon felt composite rolling equipment for manufacturing a carbon felt composite battery pole plate by adopting the production method of the carbon felt composite battery pole plate, wherein the carbon felt composite rolling equipment comprises an extruder and a composite rolling part, the extruder and the composite rolling part are arranged adjacently, the extruder is used for hot-melting and extruding a pole plate substrate, and the composite rolling part is used for carrying out composite rolling on the carbon felt and the pole plate substrate to manufacture the carbon felt composite battery pole plate;
the composite rolling part comprises a base body, an unwinding roller set, a rolling roller set and a traction roller set, wherein the unwinding roller set, the rolling roller set and the traction roller set are respectively connected with the base body, and the unwinding roller set and the traction roller set are respectively arranged adjacent to the rolling roller set;
the carbon felt unwinding roller set is arranged on the carbon felt unwinding roller set and is used for controlling the unwinding speed of the carbon felt;
the calendering roller group is used for rolling the polar plate base material which is extruded by the extruder in a hot melting way and is in a melting state and the carbon felt which is unreeled by the unreeling roller group in a tension way;
and the traction roller group is used for drawing the carbon felt composite battery plate.
Further, on the basis of the technical scheme of the invention, the calender roll group consists of two first rollers which are arranged up and down or left and right;
the traction roller group consists of two second rollers which are arranged up and down or left and right;
and the middle parts of the first roller and the second roller are provided with concave structures for controlling the compression amount of the carbon felt.
Further, on the basis of the technical scheme, a supporting roller set is further arranged between the calendering roller set and the unreeling roller set, the supporting roller set is connected with the base body, and the supporting roller set is used for achieving the change of the carbon felt direction.
Further, on the basis of the technical scheme of the invention, the carbon felt composite calendering equipment further comprises a cutting machine and an edge-closing roller;
the cutting machine is arranged adjacent to the traction roller set and is used for cutting the carbon felt composite battery pole plate which is pulled by the traction roller set;
the edge rolling roller is connected with the base body and is arranged adjacent to the cutting machine, and the edge rolling roller is used for edge rolling processing of the carbon felt composite battery pole plate cut by the cutting machine.
The invention also provides a flow battery which comprises the carbon felt composite battery plate or the carbon felt composite battery plate manufactured by the carbon felt composite calendering equipment.
Compared with the prior art, the carbon felt composite battery pole plate and the production method thereof, the carbon felt composite calendering equipment and the flow battery provided by the invention have the following advantages:
(1) the invention provides a production method of a carbon felt composite battery polar plate, which is mainly characterized in that a polar plate base material which is extruded by hot melting and is in a molten state and a carbon felt are hot-pressed together to obtain the carbon felt composite battery polar plate; meanwhile, the carbon felt composite battery pole plate obtained by the production method can fix the structure and the position of the carbon felt, and the problems of position movement or local poor contact are avoided; in addition, the production method can realize continuous production of the carbon felt composite battery plate, effectively improve the production efficiency, effectively reduce the occurrence of human misoperation during assembly and further reduce the production cost.
(2) The invention provides a carbon felt composite battery pole plate which is manufactured by adopting the production method of the carbon felt composite battery pole plate. In view of the advantages of the production method of the carbon felt composite battery pole plate, the carbon felt composite battery pole plate has an integrated structure of the pole plate base material and the carbon felt, contact resistance is eliminated, total resistance is reduced, meanwhile, position fixing between the pole plate base material and the carbon felt is achieved, and adverse effects caused by position movement or poor local contact are avoided.
(3) The invention provides a carbon felt composite calendering device which is simple in structure, can realize the integrated molding of a polar plate base material and a carbon felt, can realize the continuous operation of the carbon felt composite polar plate base material, can effectively improve the production efficiency, reduce the cost and reduce the occurrence of the problem of manual operation errors during assembly.
(4) The invention provides a flow battery, which comprises the carbon felt composite battery plate or the carbon felt composite battery plate manufactured by adopting the carbon felt composite calendering equipment. In view of the advantages of the carbon felt composite battery plate, the flow battery has lower resistivity, and the running stability and the battery performance of the flow battery are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a prior art single-sided electrode configuration for a flow battery;
FIG. 2 is a schematic structural diagram of a carbon felt composite battery plate provided by the present invention;
FIG. 3 is a schematic structural diagram of a carbon felt composite calendering apparatus provided by the present invention;
fig. 4 is a schematic cross-sectional view of the first roller and/or the second roller according to the present invention.
Reference numerals:
1-an electrode plate; 2-carbon felt; 3-a separator; 10-an extruder; 11-a plate substrate; 21-unwinding roller group; 22-calender roll group; 23-a set of traction rollers; 24-a set of support rollers; 25-a cutting machine; 26-edge rolling; 221-a first roller; 231-second roller.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the prior art, a carbon felt 2 is generally placed between an electrode plate 1 and a separator 3, as shown in fig. 1. The carbon felt 2 and the electrode plate 1 are fixed in a physical contact mode, and a large contact resistance exists between the carbon felt and the electrode plate, so that the problems of position movement or local poor contact are easy to occur under the conditions of liquid flow and continuous change of cold and hot temperatures.
In order to solve the above problems, according to an aspect of the present invention, a method for producing a carbon felt composite battery plate is provided, in which a plate substrate 11 extruded by hot melting and in a molten state is hot-pressed together with a carbon felt 2 to obtain a carbon felt composite battery plate, as shown in fig. 2.
Specifically, the material of the plate substrate 11 is not particularly limited, and may be a material commonly used in the art, such as graphite, polyethylene, polypropylene, polyvinyl chloride, polyacrylonitrile, nylon, polycarbonate, polyaniline, or the like. In a preferred embodiment, the plate substrate 11 is a graphite substrate or a polyethylene substrate, and more preferably a carbon-added polyethylene substrate.
The carbon felt in the invention mainly refers to the related carbon felt, graphite felt, carbon fiber felt and the like.
The hot pressing in the invention is the process of heating and pressing the polar plate base material 11 and the carbon felt 2 in a molten state simultaneously into the carbon felt composite battery polar plate with certain mechanical strength.
The production method of the carbon felt composite battery pole plate provided by the invention realizes the integrated molding of the pole plate substrate and the carbon felt, the direct fusion of the electrode and the carbon felt eliminates the contact resistance between the electrode and the carbon felt, the problem of non-uniformity of the contact resistance is avoided, and the overall resistance is further reduced; meanwhile, the production method can effectively fix the structure and the position of the carbon felt, avoid the problems of position movement or poor local contact, and solve the problems of large contact resistance caused by physical contact between the carbon felt and the polar plate and uneven resistance distribution caused by position movement easily occurring between the carbon felt and the polar plate in the prior art;
in addition, the production method can realize continuous production of the carbon felt composite battery plate, effectively improve the production efficiency, effectively reduce the occurrence of manual operation errors in assembly and further reduce the production cost.
In a preferred embodiment of the present invention, the carbon felt 2 is placed on both sides of the plate substrate 11, and is hot-pressed with the plate substrate 11 in a molten state by a press roll to obtain a carbon felt composite battery plate.
The polar plate base material 11 is directly welded between the two carbon felts 2, so that the carbon felts 2 and the polar plate base material 11 are integrally formed. The hot pressing effect is better by further limiting the hot pressing type.
In a preferred embodiment of the invention, the hot pressing temperature is 85 to 95 ℃. Typical but non-limiting hot pressing temperatures are 85 deg.C, 86 deg.C, 87 deg.C, 88 deg.C, 89 deg.C, 90 deg.C, 91 deg.C, 92 deg.C, 93 deg.C, 94 deg.C or 95 deg.C. By controlling the hot-pressing temperature, the plate substrate 11 and the carbon felt 2 can achieve good welding effect.
As a preferred embodiment, the polar plate substrate 11 is hot-melted and extruded out of a sheet by an extruder, and the carbon felt 2 is unreeled by an unreeling roller;
the speed of extruding the polar plate substrate 11 is consistent with the unreeling speed of the carbon felt 2, so that the polar plate substrate 11 and the carbon felt 2 can be ensured to have an accurate relative position.
The plate base material 11 is hot-melt extruded by an extruder. The extrusion temperature of the hot-melt extrusion should ensure that the plate substrate 11 is in a molten state to facilitate the composite rolling of the plate substrate 11 and the carbon felt 2.
In the hot melting extrusion process, the extrusion temperature and the rotating speed of the extruder have direct influence on the performance of the polar plate base material 11, so the extrusion temperature and the rotating speed of the extruder are controlled.
As a preferred embodiment, the extrusion temperature of hot melt extrusion is 160-210 ℃, and the rotating speed of an extruder is 200-250 rpm; typical but non-limiting extrusion temperatures are 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃ or 210 ℃, typical but non-limiting extruder speeds are 200rpm, 210rpm, 220rpm, 230rpm, 240rpm or 250 rpm.
As a preferred embodiment, when the plate substrate 11 is a carbon-added polyethylene substrate, the preparation process thereof comprises the following steps:
(a) mixing polyethylene powder raw materials and carbon powder in proportion, and then putting the mixture into a high-speed stirrer for stirring and mixing, wherein the stirring speed is 500-1000 rpm, and the stirring time is 25-35 min;
(b) and (c) putting the mixed material obtained in the step (a) into a double-screw extruder for hot melt extrusion, wherein the extrusion temperature is 160-210 ℃, and the rotating speed of the extruder is 200-250 rpm.
It should be noted that the performance requirements of the plate substrate 11 obtained through the above steps are as follows:
the addition amount of the carbon powder is 40-60%, the resistivity of a test body is less than 10 omega mm, and the elongation at break is more than or equal to 3%.
In a preferred embodiment, the damping torque of the unwinding roller is 10 to 15 kg. Typical but non-limiting damping torques for the unwind roll are 10kg, 11kg, 12kg, 13kg, 14kg or 15 kg.
The carbon felt tensioning function is realized through limiting the damping torque of the unwinding roller.
According to the second aspect of the invention, the invention also provides a carbon felt composite battery plate which is manufactured by adopting the production method of the carbon felt composite battery plate.
The carbon felt composite battery pole plate is manufactured by the production method of the carbon felt composite battery pole plate. In view of the advantages of the production method of the carbon felt composite battery pole plate, the carbon felt composite battery pole plate has an integrated structure of the pole plate base material and the carbon felt, so that the contact resistance between the pole plate base material and the carbon felt is eliminated, the total resistance is reduced, meanwhile, the position fixation between the pole plate base material and the carbon felt is realized, and the adverse effect caused by position movement or local poor contact is avoided.
According to a third aspect of the invention, a carbon felt composite calendaring device for manufacturing a carbon felt composite battery plate by using the carbon felt composite battery plate production method is provided, and is specifically shown in fig. 3.
The carbon felt composite rolling equipment comprises an extruder 10 and a composite rolling part, wherein the extruder 10 and the composite rolling part are arranged adjacently, the extruder 10 is used for hot-melting and extruding a polar plate substrate 11, and the composite rolling part is used for carrying out composite rolling on a carbon felt 2 and the polar plate substrate 11 to prepare a carbon felt composite battery polar plate;
the composite rolling part comprises a base body, an unreeling roller set 21, a rolling roller set 22 and a traction roller set 23, wherein the unreeling roller set 21, the rolling roller set 22 and the traction roller set 23 are respectively connected with the base body, and the unreeling roller set 21 and the traction roller set 23 are respectively arranged adjacent to the rolling roller set 22;
the unwinding roller set 21 is provided with a carbon felt, and the unwinding roller set 21 is used for controlling the unwinding speed of the carbon felt;
the calender roll group 22 is used for rolling the polar plate substrate 11 which is extruded by the extruder 10 in a hot melting way and is in a melting state and the carbon felt 2 which is unreeled by the unreeling roll group 21 in a tension way;
the traction roller set 23 is used for drawing the carbon felt composite battery plate.
Specifically, the extruder 10 is mainly used for hot-melting and extruding the plate substrate 11, and may be an extrusion device commonly used in the art. In a preferred embodiment, the extruder 10 is a twin-screw extruder, and the plate substrate 11 is produced by twin-screw melt-kneading and sheet-forming extrusion.
The composite rolling part is matched with the extruder 10 for use, and mainly performs composite rolling on the polar plate substrate 11 which is hot-melted and extruded by the extruder 10 and the carbon felt 2 to form the carbon felt composite battery polar plate.
The unreeling roller set 21 is mainly used for realizing tension unreeling of the carbon felt 2, the calender roller set 22 is mainly used for carrying out compression roller hot pressing on the polar plate base material 11 extruded by hot melting and the carbon felt 2 together, and after the polar plate is processed by the calender roller set 22, the integrated carbon felt composite battery polar plate is subjected to leveling cooling under certain tension by the traction roller set 23. The traction tension of the traction roller group 23 can be limited according to actual production requirements, for example, the traction tension is 15-20 kg.
The unwinding roller set 21, the calender roller set 22 and the drawing roller set 23 can be fixed on the base body by common fasteners. The fasteners may be bolts, screws, or the like. The unwinding roller group 21, the calender roller group 22 and the drawing roller group 23 are generally driven and controlled by a motor. Further, the unwinding roller group 21 is driven by a torque motor, and the calendering roller and the traction roller are driven by a stepping motor and control the rotating speed.
This compound calendering equipment of carbon felt can realize polar plate substrate 11 and carbon felt 2's integrated into one piece, still can realize the continuity of operation of compound polar plate substrate 11 of carbon felt simultaneously, can effectively improve production efficiency, reduce cost, the emergence of the human misoperation problem when reducing the equipment.
In consideration of the control of the compression joint thickness of the carbon felt 2 and the avoidance of the damage of the compression roller, on the basis of the technical scheme, the calendering roller group 22 consists of two first rollers 221 which are arranged up and down or left and right;
the traction roller group 23 is composed of two second rollers 231 arranged up and down or left and right;
the middle parts of the first roller 221 and the second roller 231 are both provided with a concave structure for controlling the compression amount of the carbon felt 2, as shown in fig. 4. The first roller 221 and the second roller 231 are configured in a specific manner, so that the crimping thickness of the carbon felt 2 can be flexibly controlled.
In a preferred embodiment, a support roller set 24 is further arranged between the calender roller set 22 and the unreeling roller set 21, the support roller set 24 is connected with the substrate, and the support roller set 24 is used for realizing the change of the direction of the carbon felt 2.
Before the carbon felt 2 is arranged in the unwinding roller set 21, a laminating machine is needed to carry out unilateral PET laminating, and the carbon felt is wound for standby. And then, die cutting the carbon felt 2 coated with the film by using an automatic die cutting machine according to the required size, reserving the PET film layer, and coiling the edge.
The carbon felt 2 is sleeved on the unreeling roller set 21, and the unreeling roller set 21 is used for tensioning the carbon felt 2. The set damping torque of the unwinding roller set 21 is not particularly limited, and may be, for example, 10 to 15 kg.
The carbon felt 2 is pressed into the calender roll group 22 together with the hot-melt extruded plate base material 11 in a molten state after being turned back by the support roll group 24.
In the embodiment of the present invention, the hot pressing temperature (roll temperature) of the calender roll group 22 is 85 to 95 ℃, preferably 86 to 94 ℃, more preferably 88 to 92 ℃, and still more preferably 90 ℃. The roll speed of the calender roll group 22 is consistent with the sheet discharging speed of the polar plate base material 11.
Further, on the basis of the technical scheme of the invention, the carbon felt composite calendering equipment further comprises a cutting machine 25 and an edge rolling roller 26;
the cutting machine 25 is arranged adjacent to the traction roller set 23, and the cutting machine 25 is used for cutting the carbon felt composite battery pole plate which is pulled by the traction roller set 23;
the edge-closing roller 26 is connected with the base body and is arranged adjacent to the cutting machine 25, and the edge-closing roller 26 is used for performing edge-closing treatment on the carbon felt composite battery pole plate cut by the cutting machine 25.
The cutting machine 25 and the edge rolling roller 26 can realize the cutting and edge rolling of the carbon felt composite battery plate. The cutting machine 25 is designed for testing the linear speed and collecting the size, the cutting die adopts an air cylinder for supplying pressure, and the electromagnetic valve drives the air pressure of the branch circuit to realize cutting.
According to a fourth aspect of the invention, the flow battery comprises the carbon felt composite battery plate or the carbon felt composite battery plate manufactured by the carbon felt composite rolling equipment.
The flow battery can be an all-vanadium flow battery and can also be a zinc-bromine battery.
In view of the advantages of the carbon felt composite battery plate, the flow battery has lower resistivity, and the running stability and the battery performance of the flow battery are greatly improved.
Experiments prove that the carbon felt composite battery plate is applied to the all-vanadium redox flow battery, and the assembled redox flow battery is tested, so that the voltage efficiency is improved by 4-6% compared with that of the conventional contact-compression-bonded redox flow battery, the sealing performance and the gas-liquid barrier performance are good, and a good technical effect can be achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A production method of a carbon felt composite battery plate is characterized by comprising the following steps:
and (3) carrying out hot-melting extrusion on the polar plate base material in a molten state and carrying out hot pressing on the polar plate base material and the carbon felt together to obtain the carbon felt composite battery polar plate.
2. The production method according to claim 1, wherein the carbon felt is respectively arranged on two sides of the plate substrate and is hot-pressed with the plate substrate in a molten state by a press roll to obtain a carbon felt composite battery plate;
preferably, the hot pressing temperature is 85-95 ℃.
3. The production method according to claim 1 or 2, wherein the polar plate substrate is hot-melted and extruded out of a sheet by an extruder, and the carbon felt is unreeled by an unreeling roller;
the extrusion sheet-out speed of the polar plate base material is consistent with the unreeling speed of the carbon felt.
4. The production method according to claim 3, wherein the extrusion temperature of the hot melt extrusion is 160 to 210 ℃, and the rotation speed of the extruder is 200 to 250 rpm;
and/or the damping torque of the unwinding roller is 10-15 kg.
5. A carbon felt composite battery plate, which is characterized by being manufactured by the production method of the carbon felt composite battery plate as claimed in any one of claims 1 to 4.
6. The carbon felt composite rolling equipment for manufacturing the carbon felt composite battery plate by adopting the production method of the carbon felt composite battery plate as claimed in any one of claims 1 to 4, is characterized by comprising an extruder and a composite rolling part, wherein the extruder and the composite rolling part are arranged adjacently, the extruder is used for hot-melting and extruding a plate substrate, and the composite rolling part is used for carrying out composite rolling on the carbon felt and the plate substrate to manufacture the carbon felt composite battery plate;
the composite rolling part comprises a base body, an unwinding roller set, a rolling roller set and a traction roller set, wherein the unwinding roller set, the rolling roller set and the traction roller set are respectively connected with the base body, and the unwinding roller set and the traction roller set are respectively arranged adjacent to the rolling roller set;
the carbon felt unwinding roller set is arranged on the carbon felt unwinding roller set and is used for controlling the unwinding speed of the carbon felt;
the calendering roller group is used for rolling the polar plate base material which is extruded by the extruder in a hot melting way and is in a melting state and the carbon felt which is unreeled by the unreeling roller group in a tension way;
and the traction roller group is used for drawing the carbon felt composite battery plate.
7. The carbon felt composite calendaring device as claimed in claim 6, wherein the calendaring roller set is composed of two first rollers arranged up and down or left and right;
the traction roller group consists of two second rollers which are arranged up and down or left and right;
the middle parts of the first roller and the second roller are respectively provided with a concave structure for controlling the compression amount of the carbon felt.
8. The carbon felt composite calendering equipment of claim 6 or 7, wherein a support roller set is further arranged between the calendering roller set and the unreeling roller set, the support roller set is connected with the substrate, and the support roller set is used for realizing the change of the direction of the carbon felt.
9. The carbon felt composite calendaring apparatus according to claim 6 or 7, wherein the carbon felt composite calendaring apparatus further comprises a cutting machine and a edging roll;
the cutting machine is arranged adjacent to the traction roller set and is used for cutting the carbon felt composite battery pole plate which is pulled by the traction roller set;
the edge rolling roller is connected with the base body and is arranged adjacent to the cutting machine, and the edge rolling roller is used for edge rolling processing of the carbon felt composite battery pole plate cut by the cutting machine.
10. A flow battery, comprising the carbon felt composite battery plate of claim 5 or the carbon felt composite battery plate manufactured by the carbon felt composite calendering apparatus of any one of claims 6 to 9.
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