CN113714287A - Production process of aluminum foil for Dada double-sided photocell - Google Patents
Production process of aluminum foil for Dada double-sided photocell Download PDFInfo
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- CN113714287A CN113714287A CN202011636182.3A CN202011636182A CN113714287A CN 113714287 A CN113714287 A CN 113714287A CN 202011636182 A CN202011636182 A CN 202011636182A CN 113714287 A CN113714287 A CN 113714287A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production process of an aluminum foil for a dynein double-sided photocell, which comprises the following steps: step 1, carrying out rough rolling processing on an aluminum foil material; step 2, carrying out medium rolling and finish rolling on the roughly rolled aluminum foil material; step 3, slitting and processing the aluminum foil after the middle rolling and the finish rolling; step 4, rewinding the cut aluminum foil; and 5, packaging the reversely rolled aluminum foil. Through the operation, the initial dyne value of the blanking of the rolling mill can be effectively improved. The energy consumption during processing is reduced. Compared with the traditional method, the method does not independently increase working procedures, and the dyne value of the finished product is more than or equal to 38 dyn. The technical scheme of the invention effectively overcomes the defects of the traditional technology and fills the technical blank that the dyne value of the finished product can not reach 38 dyn.
Description
Technical Field
The invention relates to a production process of an aluminum foil for a dyne double-sided photocell.
Background
Through the continuous upgrading of the technology of the aluminum processing industry in China, the aluminum foil products are more and more widely used, from medical medicine and flexible packaging to paperboard and cigarette packaging, from wine labels and manufacturing pipes to air conditioners and electronics, and then to containers and households, and the aluminum foil gradually permeates all walks of life and all daily production aspects.
Along with the adjustment of new energy strategy of the country and the rapid development of the electronic consumer industry and the electric automobile industry, the demand of various lithium battery cells is increasing year by year, and accordingly, the demand of related products matched with the lithium battery cells is increasing continuously, and as one of four main materials of the lithium battery, the aluminum foil for the lithium battery becomes an important material which is the same as a positive electrode, a negative electrode, a diaphragm and the like.
The Hangzhou five-star aluminum industry is used as an enterprise which is in contact with the aluminum foil for the lithium battery in the industry for the first time, is dedicated to the process research and the new product development of the aluminum foil for the lithium battery for a long time, and the production process technology of the aluminum foil for the battery reaches the world leading level. At present, the Hangzhou five-star aluminum industry has a mature aluminum foil product series for lithium batteries, and has complete customer groups and mature production process technology in the aspects of application, from power, to digital, to energy storage, and from performance, from general performance, to high performance. The aluminum foil for the high-dyne-value double-light lithium battery which is independently researched and developed in the five-star aluminum industry is the first creation of the industry, and the stable batch production capacity is formed at present.
Aluminum foil for lithium battery: the anode material is a material used as a current collector when being applied to the production of various lithium batteries; the processing technology of the lithium battery is complex, and more than 30 working procedures are often needed to complete the lithium battery, so that the matched battery foil product is different from the aluminum foil product for common use. The product is required to have the characteristics of high conductivity, hard state, high strength, good surface quality and the like.
At present, lithium ion batteries are widely used in production and life of people, but safety problems caused by abnormal problems of the lithium ion batteries are rare, and meanwhile, the limited energy density of the conventional lithium ion batteries is a core reason that electric automobiles cannot be completely spread, so that high requirements on safety and capacity density of the lithium ion batteries are met, and the lithium ion batteries become a bottleneck of the industry. Since the development of the aluminum foil for lithium ion in China starts late, high-grade aluminum foil products for lithium ion batteries mainly depend on import (such as Korea, Japan and the like), and the development of the lithium batteries in China is severely restricted by high price, long period and the like of foreign battery foils.
In the aluminum processing industry, aluminum foils used for medicines, flexible packages, paperboard, cigarette packages, wine labels, tube making, electronics, containers and household need to be annealed, the surface state is generally O state (soft state), the performance interval of the O state product is 60-100 Mpa, and oil films on the surfaces of the aluminum foils are basically removed after high-temperature treatment for at least 150 degrees, 24 hours and even more than 100 hours.
None of these aluminum foil products, like the battery foils, require a hard state (H18 state) with strengths as high as 200Mpa or more are common. The difficulty in developing the battery foil is to ensure that the strength is not reduced and that the surface wetting tension of the aluminum foil is sufficient to allow the flowing cathode material to adhere.
Because of the double-light product, the surface of the material is more oil-carrying in the rolling process, the more oil-carrying, the lower the surface wetting tension, and the lower the dyne value (the dyne value is the indicator index of the wetting tension). In addition, the porosity between the layers of the coiled double-sided smooth aluminum foil is very small, and the extremely thin oil film on the surface of the aluminum foil cannot be removed, so that the aluminum foil cannot be subjected to simple annealing treatment in the process. In the aluminum foil processing process, after the last rolling, the dual-light battery foil dyne value is often only 29 dynes, which cannot meet the adhesion of the positive electrode material at all, so that the conditions of 'tailing' and 'missing coating' can be caused in the lithium battery manufacturing and coating process, as shown in fig. 5 and 6. The manufacturing links of some high-end lithium batteries (such as lithium batteries carried by Tesla, the general public and the like) are provided with special processes, and the dyne value of the aluminum foil is required to at least meet more than 33 dynes.
In the field of battery foils, the dyne value is generally divided into three intervals:
(ii) less than 30dyn is a low dyne value;
the dyne value is 30-31 dyn and belongs to a conventional dyne value;
and the dyne value more than or equal to 32dyn belongs to a high dyne interval.
The dyne value needs to be more than or equal to 33dyn and can be ensured to be maintained for a long time (2 months), and the technical problem is not successful in the industry.
With the vigorous development of new energy industry, the global demand for lithium batteries has increased in a blowout manner, so the demand of battery foils has also increased continuously, and main customers such as tesla, the public, yota, BYD, CATL, ATL, samsung and the like. The battery foil is mainly distributed in the fields of power, digital, energy storage batteries and the like.
The aluminum foil dyne value of the energy storage lithium battery basically requires that the dyne value is more than or equal to 30 dyn; the aluminum foil dyne value requirement for high-end digital and high-end power lithium batteries is 33 dyn.
The production of the double-sided foil is difficult to overcome due to high strength, oil weight of the double-optical band, small thickness (less than or equal to 15 mu m), incapability of passing through traditional annealing treatment and the like. In addition, different from other technical indexes, the dyne value can be attenuated to different degrees along with the change of time under the natural environment, so that the problem is more troublesome.
Due to the fact that the production of the double-sided photovoltaic cell foil is not mature, the production process can not be used for reference, and the production process of the product needs to be explored from the beginning. The prior art has the following defects and shortcomings:
1. annealing process: the traditional method for improving the surface wetting tension of the single-light aluminum foil is mainly to carry out annealing treatment, and discharge rolling oil on the surface of the aluminum foil through long-time high temperature, so that the surface of the aluminum foil is free of oil, and the surface wetting tension of the aluminum foil can be improved to a certain degree. However, the product is a battery foil product, and is required to be in a hard state (H18 state), and the tensile strength of the product after long-time high-temperature annealing cannot meet the requirement; and because the aluminum foil is a product with double-sided light, the porosity between the aluminum foil layers is very small (less than 5 percent), oil films cannot be effectively removed, and the process cannot be applied.
2. Acid washing, alkali washing and water washing processes: in the production link of air-conditioning foil or embossed oxidation plate (thickness is more than or equal to 0.2mm), the surface of an aluminum plate is cleaned by using the processes of acid washing, alkali washing and water washing, the oil film on the surface is removed, then the aluminum plate enters a long oven, and the liquid on the surface is removed at high temperature in the oven. The surface of the aluminum plate is rapidly oxidized into aluminum oxide, and the wetting tension of the surface is improved. However, the process is only useful for aluminum plates and is not applicable to products of aluminum foil (thickness less than or equal to 15 μm). The foil is thin and can deform when passing through liquid, resulting in wrinkles. In addition, the cleaning speed is slow (generally only 5-10 m/min), and the requirement of mass production cannot be met at all. The cost is also increased by several times.
3. Surface baking: on an aluminum foil for carbon coating (a product with high added value), when the extremely thin carbon black coated on the surface can not be attached, the aluminum foil is put into an oven for baking, and the baking method comprises the following steps: the aluminum foil is spread and passes through a roller system of an oven (the length of the oven is about 40 meters), the temperature is raised to 120 degrees, and the tape moving speed is controlled to be about 20 m/min. The surface wetting tension can be increased from 30dyn to 31 dyn. However, this process has some problems: firstly, the speed is slow, and the requirement of mass production cannot be met; the second is that the roller system is many, easily leads to the pockmark (concave-convex point), and the probability that the outward appearance is unqualified increases, and the third is that the roller system is many, easily corrugates.
4. Surface purging: and a duckbill sector purging device is arranged on the rolling outlet side, and the aluminum foil soaked in the rolling oil is purged under high pressure to purge the rolling oil on the surface. The surface of the aluminum foil after being blown has no obvious oil spots. However, in the case of a double-beam aluminum foil having a thickness of 15 μm or less, since a roll gap remains, oil stains on the surface cannot be sufficiently removed, and the surface of the rolled aluminum foil has oil in various degrees. The structure of the rolling mill is shown in FIG. 7.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a process for producing an aluminum foil for a bifacial photovoltaic cell is provided to solve at least some of the above problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the production process of the aluminum foil for the dynein double-sided photocell comprises the following steps:
step 1, carrying out rough rolling processing on an aluminum foil material;
step 2, carrying out medium rolling and finish rolling on the roughly rolled aluminum foil material;
step 3, slitting and processing the aluminum foil after the middle rolling and the finish rolling;
step 4, rewinding the cut aluminum foil;
and 5, packaging the reversely rolled aluminum foil.
Furthermore, in the step 2, when the aluminum foil material is subjected to medium rolling and finish rolling, oil indexes need to be controlled, so that the surface cleanliness and the surface initial wetting tension of the aluminum foil after the rolling of the rolling mill are ensured; the oil control indexes are as follows: viscosity: under the environment of 40 ℃, 2/s with the thickness of 1.7-2.0 mm; residual oil mass: less than or equal to 8 ml; light transmittance: more than or equal to 90 percent; ester content: 8.0% -12%; alcohol content: 0.5-1.5%; the colloid content is as follows: less than or equal to 10 g/L.
Further, in the step 2, when the aluminum foil material is subjected to medium rolling and finish rolling, the purging partial pressure is 0.4-0.6 Mpa, and the rolling speed of the rolling mill is 500-700 m/min.
Further, in the step 2, the roller diameter of the roller is 270-280mm, the roller convexity is 60-100 per mill, the roller roughness is 0.10-0.15 mu m, the rolling reduction of the medium rolling and the finish rolling is controlled between 35-45%, and the oil temperature of rolling oil is more than or equal to 45 ℃.
Further, in the step 3, when the aluminum foil is cut, the aluminum foil is rolled and then is transferred to a cutting process within 4 hours, if the transfer time exceeds 4 hours, the whole coil material is kept close to a furnace for heat preservation, the surface temperature of the aluminum foil is guaranteed to be more than or equal to 30 ℃ in the cutting process, a heat preservation device is installed on the cutting machine, and the peripheral temperature of the heat preservation device is guaranteed to be more than or equal to 60 ℃; the distance between the device and the material surface is less than or equal to 30 cm.
Further, in the step 3, when the aluminum foil is cut, the cutting speed is less than or equal to 300 m/min.
Further, in step 3, the guide roll of the slitting machine is wiped once per minute of the cut-off, and the oil evaporating above the surface treatment device is cleaned without any shift.
Further, in the step 4, when the aluminum foil is rewound, high-temperature discharge is adopted to process the aluminum foil, so that an oil film on the surface of the aluminum foil is broken up instantly, ozone generated by high-voltage discharge can effectively prevent functional groups broken up from polymerizing, and meanwhile, the discharge negative pressure end can suck away oil gas subjected to surface treatment, so that surface residual oil is reduced, and the dyne value is improved.
Further, in the step 4, when the aluminum foil is rewound, the rewinding speed is less than or equal to 100m/min, the distance between the discharging rewinding equipment and the surface of the aluminum foil is less than or equal to 2mm, the power of the discharging rewinding equipment is 10-15 KW, and the number of the aluminum foils to be processed is 6.
Further, in the step 5, when the aluminum foil is packaged, the surface of the foil is covered with a layer of pearl cotton and then covered with a layer of PE film, and the end face of the foil is completely covered with round pearl cotton; the covered PE film is fastened and fixed by a rubber band to prevent air from entering; packaging the aluminum foil coil by using an aluminum plastic film packaging material with good tightness; introducing inert gas into the aluminum foil during sealing to prevent the aluminum foil from contacting air; the tube core used for packaging is protected, and the package is prevented from being damaged in the transportation process.
Compared with the prior art, the invention has the following beneficial effects:
(1) the initial dyne value of the blanking of the rolling mill is improved. By measures such as oil product, process, equipment maintenance and the like of the centering and finishing mill, the dyne value can basically reach more than or equal to 31dyn after the mill is blanked, and the requirements of digital battery foil products can be met.
(2) Avoiding more energy consumption. After conversion, compared with the traditional schemes of annealing process, water washing, acid washing, alkali washing and the like, the method of the invention can greatly reduce the energy consumption and save a large amount of cost for companies.
(3) The method does not independently increase working procedures, mainly improves the original equipment and optimizes the process, and improves the primary qualified rate of the battery foil products by more than 20 percent through the adjustment.
(4) The dyne value of the finished product is more than or equal to 38 dyn. According to the scheme of the invention, the initial dyne value of the battery foil produced by rewinding can reach over 38dyn, and the dyne value level belongs to the industry leading level at present. Therefore, the department can quickly occupy a high-end lithium battery client group. Such as samsung, LG, tesla, toyota, etc. The technical scheme of the invention effectively overcomes the defects of the traditional technology and fills the technical blank that the dyne value of the finished product can not reach 38 dyn.
Drawings
FIG. 1 is a schematic representation of a surface wetting tension measuring device (dyne value) according to the present invention.
FIG. 2 is a schematic view of the contact angle of the present invention.
FIG. 3 is a graph showing the correlation between the contact angle and the dyne value according to the present invention.
FIG. 4 is a schematic diagram of the variation of contact angle at different temperatures according to the present invention.
Fig. 5 is a schematic view of the missing coating (missing white dots).
Fig. 6 is a schematic view of tailing (slurry failed to adhere).
Fig. 7 is a view showing the structure of the rolling mill (purge device at position No. 8).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it 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 relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 7, the process for producing an aluminum foil for a high dyne double-sided photovoltaic cell provided by the invention comprises the following steps:
step 1, carrying out rough rolling processing on an aluminum foil material;
step 2, carrying out medium rolling and finish rolling on the roughly rolled aluminum foil material;
step 3, slitting and processing the aluminum foil after the middle rolling and the finish rolling;
step 4, rewinding the cut aluminum foil;
and 5, packaging the reversely rolled aluminum foil.
In the step 2, when the aluminum foil material is subjected to medium rolling and finish rolling, oil indexes need to be controlled, so that the surface cleanliness and the surface initial wetting tension of the aluminum foil after the rolling of a rolling mill can be ensured; the oil control indexes are as follows: viscosity: under the environment of 40 ℃, 2/s with the thickness of 1.7-2.0 mm; residual oil mass: less than or equal to 8 ml; light transmittance: more than or equal to 90 percent; ester content: 8.0% -12%; alcohol content: 0.5-1.5%; the colloid content is as follows: less than or equal to 10 g/L. When the aluminum foil material is subjected to medium rolling and finish rolling, the purging partial pressure is 0.4-0.6 Mpa, and the rolling speed of a rolling mill is 500-700 m/min. The roller diameter is 270 plus 280mm, the roller convexity is 60-100 per mill, the roller roughness is 0.10-0.15 mu m, the rolling reduction of medium rolling and finish rolling is controlled between 35-45 percent, and the oil temperature of rolling oil is more than or equal to 45 ℃.
In the step 3, the aluminum foil is cut, the aluminum foil is rolled for 4 hours and then is transferred to a cutting process, if the transfer time exceeds 4 hours, the whole coil is kept close to a furnace for heat preservation, the surface temperature of the aluminum foil is guaranteed to be more than or equal to 30 ℃ in the cutting process, a heat preservation device is installed on the cutting machine, and the peripheral temperature of the heat preservation device is guaranteed to be more than or equal to 60 ℃; the distance between the device and the material surface is less than or equal to 30 cm. When the aluminum foil is cut, the cutting speed is less than or equal to 300 m/min. One wipe of the diverter guide rollers was performed per minute cut, and the oil evaporated above the surface treatment device was cleaned without a shift.
In the step 4, when the aluminum foil is rewound, high-temperature discharge is adopted to process the aluminum foil, so that an oil film on the surface of the aluminum foil is broken up instantly, ozone generated by high-voltage discharge can effectively prevent functional groups broken up from polymerizing, and meanwhile, the discharge negative pressure end can suck away oil gas subjected to surface treatment, so that surface residual oil is reduced, and the dyne value is improved. When the aluminum foil is rewound, the rewinding speed is less than or equal to 100m/min, the distance between the discharging rewinding equipment and the surface of the aluminum foil is less than or equal to 2mm, the power of the discharging rewinding equipment is 10-15 KW, and the number of the processed aluminum foils is 6.
In the step 5, when the aluminum foil is packaged, the surface of the foil is covered with a layer of pearl cotton and then covered with a layer of PE film, and the end face of the foil is completely covered with round pearl cotton; the covered PE film is fastened and fixed by a rubber band to prevent air from entering; packaging the aluminum foil coil by using an aluminum plastic film packaging material with good tightness; introducing inert gas into the aluminum foil during sealing to prevent the aluminum foil from contacting air; the tube core used for packaging is protected, and the package is prevented from being damaged in the transportation process.
By adopting the method, the blanking initial dyne value of the rolling mill is improved. By measures such as oil product, process, equipment maintenance and the like of the centering and finishing mill, the dyne value can basically reach more than or equal to 31dyn after the mill is blanked, and the requirements of digital battery foil products can be met. Avoiding more energy consumption. After conversion, compared with the traditional schemes of annealing process, water washing, acid washing, alkali washing and the like, the method of the invention can greatly reduce the energy consumption and save a large amount of cost for companies. The method does not independently increase working procedures, mainly improves the original equipment and optimizes the process, and improves the primary qualified rate of the battery foil products by more than 20 percent through the adjustment. The dyne value of the finished product is more than or equal to 38 dyn. According to the scheme of the invention, the initial dyne value of the battery foil produced by rewinding can reach over 38dyn, and the dyne value level belongs to the industry leading level at present. Therefore, the department can quickly occupy a high-end lithium battery client group. Such as samsung, LG, tesla, toyota, etc.
The realization of the comprehensive popularization and the promotion of the electric automobile is a necessary trend. The market demand for aluminum foils for battery foils for current collector batteries has increased year by year and has now developed into a very important aluminum foil variety. The industrial chain of the production of the product is mature year by year, and the production process is gradually stable. In 2016, the first national standard for aluminum foil for batteries was also promulgated and implemented. The battery foil product is mainly applied to the fields of mobile phone batteries, automobile batteries and the like; the product supply chain has domestic and imported products. At present, a plurality of manufacturers capable of providing battery foils are provided in China, and the aluminum foils produced by hot rolling and cast rolling processes are available.
The battery foil product has strict requirements on the product quality because the application field of the battery foil product is mainly in the electronic and automobile industries, and compared with other aluminum foil products, the battery foil product has high production process difficulty and high control level requirement. Although battery foils are produced in large quantities in China at present, a plurality of technical problems are still not well solved, a plurality of high-end products still depend on import, and the production cost is very high. Therefore, it is of great significance to accelerate the research and development of this variety.
The manufacturing links of some high-end lithium batteries (such as lithium batteries carried by Tesla, the public, the BMW and the like) are provided with special processes, and the dyne value of the aluminum foil is required to at least meet more than 33 dynes. The current industry cannot stably meet the requirement. The main difficulty is that the charge surface of the double-light product is oily, and the more oily the charge surface is, the lower the surface wetting tension is, and the lower the dyne value is. In addition, the porosity between the layers of the coiled double-sided smooth aluminum foil is very small, and the extremely thin oil film on the surface of the aluminum foil cannot be removed, so that the aluminum foil cannot be subjected to simple annealing treatment in the process. In the aluminum foil processing process, after the last rolling, the dual-light battery foil dyne value is often only 29 dynes, which cannot meet the adhesion of the anode material at all.
In order to change the current situation, meet the requirements of customers and fill up a gap of the domestic aluminum foil production process technology, the Hangzhou five-star aluminum industry Limited company successfully produces the dual-photocell foil product with dyne value stable at 33dyn within 3 months in batch by first conducting a series of research and development in the industry.
The difficulties of the high dyne value double-light cell foil product are mainly in the following aspects from the technical point of view analysis:
1. the surface of the double-light product rolling link is heavy with oil: the double-light cell foil has a certain roll gap because a single sheet is rolled in the rolling process, and a large amount of rolling oil with oil is needed in the rolling process, otherwise, partial loosening is easy to occur.
2. Bifocal products cannot be handled by traditional methods: oil films exist between layers of the double-photo-cell foil product, the porosity is low under the action of rolling tension, and the oil films on the surfaces cannot be removed through a traditional annealing process.
3. The foil thickness of the double-light cell in the research is thin (less than or equal to 15 mu m): at present, aluminum foils for power and digital batteries are basically less than or equal to 15 microns, and oil films cannot be effectively reduced through traditional purging. In addition, the surface cannot be cleaned under the thickness, and quality problems such as wrinkling, surface scratching and the like are easily caused.
4. The dyne value decays: the bifocal cell foil shows a certain degree of attenuation of the dyne value along with the change of time, and the attenuation rule is also related to the temperature. For this study, no experience is currently available in the industry.
5. The customer requirement is high: with the popularization of lithium batteries, a plurality of special processes exist at a client, the current aluminum foil dyne value for high-end battery foils basically requires more than 33 dynes, and for the index, the aluminum foil dyne value still needs to be effective within 3 months.
For the above phenomena, we have conducted a cause analysis, and the following causes are considered to be mainly included:
1. the surface of the double-light product rolling link is heavy with oil: the double-light cell foil has a certain roll gap because a single sheet is rolled in the rolling process, and a large amount of rolling oil is needed in the high-speed rolling process. In addition, certain oil film strength is required in the rolling process, so that the surface of the aluminum foil is inevitably oiled.
2. Bifocal products cannot be handled by traditional methods: oil films exist between layers of the double-photo-cell foil product, the porosity is low under the action of rolling tension, and the oil films on the surfaces cannot be removed through a traditional annealing process. And (3) trying to perform a plurality of groups of experiments inside, putting the cut materials into an annealing furnace, trying to use 120, 150 and 180 ℃, and finding that the dyne value is not obviously improved under the condition that the temperature keeping time at the temperature is different from 12h, 15h, 18h, 20h and 24h, and the dyne value is improved by 1 dyne value at most, but the performance of the aluminum foil is glided to a certain degree. The process is time consuming and the results are not significant.
3. The foil of the double-light battery in the research is thin, and an oil film cannot be effectively reduced through traditional blowing. In addition, the surface cannot be cleaned under the thickness, and quality problems such as wrinkling, surface scratching and the like are easily caused. Unlike air conditioning foils and embossed oxide plates, the thickness of the aluminum foil of the battery foil in the research is only 15 micrometers, and the aluminum foil is easy to break when being threaded in the rolling process, so that the aluminum foil cannot be treated by a method such as cleaning.
4. The dyne value decays: the bifocal cell foil decays over time; the explanations that are obtained from the existing studies are: the rolling oil consists of base oil and additives. Base oil the base oil for aluminum foil rolling is generally a paraffin base oil with a carbon chain length of 12 to 15 and a molecular general formula of CnH2 n + 2. When they are contacted with metal surface, because they have no permanent dipole, only the interior of the molecule can produce instantaneous dipole due to asymmetric movement of electron and atomic nucleus, and the dispersion force produced by instantaneous dipole can be used to form nonpolar molecular boundary lubricating film. The main function of the additive is to assist the adsorption of the base oil. Since the additive often contains permanent dipoles such as hydroxyl, carboxyl, ester and the like, when the molecules of the additive form a monomolecular adsorption film on the metal surface, these polar groups often adsorb on the surface of the aluminum foil through van der waals' force with the oxide layer on the surface. While the non-polar groups are in close proximity to the molecules in the base oil. The actual adsorption film is usually not only one layer, but can form multiple layers or even hundreds of layers, polar groups and non-polar groups are alternately arranged, and the adsorption film with the structure is usually provided with a plurality of gaps through which molecules with smaller sizes, such as oxygen, water, carbon dioxide and the like in the air can easily pass due to the space orientation of the base oil. And water molecules and additives are competitively adsorbed on the aluminum foil, so that the multi-layer film structure is damaged. In addition, water molecules can interact with polar groups of the additive, so that the aluminum foil can physically and chemically react with other nonpolar molecules in the air, such as oxygen and carbon dioxide, and the surface tension of the aluminum foil is weakened.
The invention relates to a design of a main process route and a technical scheme for solving the technical problem.
Firstly, intermediate rolling and finish rolling:
oil control
The oil index control of the medium rolling and the finish rolling can ensure the surface cleanliness and the surface initial wetting tension of the aluminum foil after the rolling of the rolling mill is finished. The main indexes are as follows:
1. viscosity: 2/s (40 ℃) with the thickness of 1.7-2.0 mm;
2. residual oil mass: less than or equal to 8 ml;
3. light transmittance: more than or equal to 90 percent;
4. ester content: 8.0% -12%;
5. alcohol content: 0.5-1.5%;
6. the colloid content is as follows: less than or equal to 10 g/L.
(II) purging of rolling mill
Purging partial pressure: 0.4 to 0.6 MPa.
(III) oil proofing of outlet
1. Both ends of the outlet side are covered by aluminum clusters;
2. cleaning the cross beam and the smoke hood for the first time before production;
3. the outlet side is added with compressed air for removing oil.
(IV) Rolling Mill Process
1. The rolling speed of the rolling mill is as follows: 500 to 700 m/min.
2. And (3) a rolling process:
TABLE 1 roller standard
3. The reduction amount: the rolling reduction of the medium rolling and the rolling is controlled between 35 percent and 45 percent.
4. The temperature of rolling oil: not less than 45 ℃.
(V) surface quality
1. The outlet side is provided with oil and is controlled to be at A grade;
2. and no oil gas exists at the outlet side of the rolling mill.
Secondly, slitting:
temperature maintenance
1. The materials are circulated to a slitting process within 4 hours after being rolled;
2. if the turnover time exceeds 4 hours, the whole coil material is kept warm in a furnace, and the surface temperature of the aluminum foil in the slitting process is ensured
≥30℃；
3. Installing a heat preservation device on the splitting machine, wherein the peripheral temperature of the heat preservation device is guaranteed to be more than or equal to 60 ℃; distance between the device and the material surface
≤30cm。
(II) slitting process
Cutting speed: less than or equal to 300 m/min.
(III) surface control
1. Wiping the guide roller of the slitting machine once every minute cutting;
2. the oil evaporated above the surface treatment device was cleaned without shift.
Thirdly, rewinding procedure:
the dyne value of the surface of the aluminum foil after slitting is 30-31 dyn, and far less than 38dyn (reserved attenuated space). Therefore, special treatment is required in the rewinding step.
The surface treatment equipment designed by the invention is arranged on a rewinding machine, is arranged between uncoiling and coiling of the rewinding machine, and winds an aluminum foil on the treatment equipment, and is arranged above or below a guide roller. The charge level is treated through high-temperature discharge, an oil film on the surface of the aluminum foil is broken up instantly, functional groups which can effectively prevent the charge level from being broken up by ozone caused by high-temperature discharge are polymerized, and meanwhile, oil gas subjected to surface treatment can be sucked away by negative pressure of the surface treatment equipment, so that residual oil on the surface is reduced, and the cause value is improved.
Surface treatment equipment process
1. The speed is less than or equal to 100 m/min;
2. the distance between the surface treatment equipment and the material surface is less than or equal to 2 mm;
3. the power of the surface treatment equipment is 10-15 KW;
4. number of mounting panels of surface treatment apparatus: 6, the number of the cells is 6;
5. the treatment times of the surface treatment equipment are more than or equal to 2 times.
(II) surface quality
1. The aluminum foil needs to be cleaned for the roller system because of more rollers, and the roller system is cleaned once after each treatment, so that the surface is ensured to have no foreign matters;
2. before production, the roller system needs to be ensured to rotate flexibly, and the surface is prevented from being scratched;
3. the distance between the surface treatment device and the charge level is only 2mm, so that the aluminum foil plate type lower bed amount needs to be controlled within 2 mm;
4. after the surface treatment device is used, the panel needs to be wiped and cleaned once per shift.
5. The charge level needs no apparent linear oil after being treated.
Fourthly, a packaging procedure:
because of the high-dyne product, the rewinding machine needs to be transferred to the packaging area within 2 hours after production is finished, and then packaging is carried out. And the packaging needs to be finished under a constant temperature and humidity environment (a constant temperature and humidity clean workshop). The packaging needs to meet the following requirements:
1. covering a layer of pearl cotton on the surface of the aluminum foil, then covering a layer of PE film, and completely covering the end surface of the aluminum foil by using round pearl cotton;
2. the covered PE film is fastened and fixed by a rubber band to prevent air from entering;
3. packaging the material roll by using an aluminum plastic film packaging material with good tightness;
4. and inert gas is introduced into the aluminum foil during sealing to prevent the aluminum foil from contacting with air.
5. And sealing after the inflation is finished.
6. The tube core used for packaging is protected, and the package is prevented from being damaged in the transportation process.
Compared with the prior art, the invention has the main improvement points that:
1. introducing the concept of contact angle
By introducing the contact angle, the variation of the wetting tension (dyne value) of the surface along with the temperature and the time is tracked, so that a relevant factor is found, and the influence degree on the dyne value is found by identifying the factor. And finding out a process window meeting the requirements through related rules.
2. Adjusted rolling process of rolling mill
After rolling, the surface of the battery foil has a very thin oil film, which is contrary to the increase of the dyne value, and the polarity of the oil film on the surface of the aluminum foil is required to be weakened. Therefore, the oil product of the rolling mill is adjusted, and the polarity of the oil film on the surface of the aluminum foil can be effectively reduced.
And secondly, by adjusting the process speed, the roller parameters, the oil temperature, the pressing amount and the like, the oil carried on the surface can be effectively reduced, and the oil temperature can be increased to promote the volatilization of the oil film on the surface.
3. Adjusts the slitting process
In the cutting process, the improvement point is that the surface of the material to be cut is ensured to have certain temperature by carrying out heat preservation treatment on the aluminum coil to be cut, and in the operation process, a single aluminum foil is crossed and exchanged with hot air, so that an oil film on the surface is effectively volatilized. The amount of oil is reduced in this process.
4. The process of rewinding is adjusted
The finished product is obtained after the rewinding, so that the surface treatment measures are switched into in the modification link to be the most effective scheme; by means of measurement and evaluation in the field, a surface treatment device is provided between the unwinding and winding of the rewinder. According to a re-verification scheme, the oil can be effectively removed through high-temperature and high-pressure impact on the surface, and ozone can be generated through high-temperature discharge to protect the surface of the aluminum foil and prevent the secondary polymerization of polar functional groups.
Parameters such as power, distance, speed and processing times of the device are verified through the DOE.
5. Adjust the packaging mode
By tracking, the dyne value is found to be attenuated along with the change of time, how to delay the attenuation speed in the process is found, and internal experiments show that the attenuation of the dyne value can be effectively relieved by sealing after inert gas is introduced in the packaging process. After the surface treatment, some scattered functional groups exist on the surface of the aluminum foil, and under the action of air and temperature, the functional groups can perform reverse reaction to form an oil film again. The inert gas is added to block air, and the material temperature can be ensured within a period of time.
The technology of the invention introduces a contact angle concept, and the surface wetting tension is mainly performed in a pointer mode of 2 types at present, one type is a dyne value, and the other type is a contact angle. Because the dyne value is detected more quickly, the method is more suitable for field operation. However, in this study, a contact angle method was used. Since the dyne value needs to be increased from the original ≦ 29dyn to 33 dyn. The span of the increase of the dyne value is small, and the attenuation rule cannot be effectively monitored through the dyne value. And the change of the surface wetting tension can be effectively observed by introducing a contact angle in the experimental process. Characterization of surface wetting tension measurement-dyne values are shown in figure 1.
Contact angle as shown in fig. 2, the contact angle is defined as: wetting properties are primarily a function of the liquid contact angle. The liquid contact angle is the angle theta between the horizontal line of the solid-liquid interface and the tangent of the gas-liquid interface at the meeting point of the gas, liquid and solid phases when a liquid drop is not completely spread on the surface of a solid, and is called the contact angle. Wetting of the solid by the liquid was judged by contact angle: the case when θ < 90 ° is called wetting; theta > 90 DEG is called non-wetting; θ is 0 ° or absent is called complete wetting; and theta is 180 deg. is called completely non-wetting. θ is the dividing line between wetting and not wetting. Correlation of contact angle with dyne value: the larger the dyne value, the smaller the contact angle. The dependence of the contact angle on the dyne value is shown in fig. 3.
The technology of the invention tracks the attenuation rule, tracks the battery foil products produced in the early stage and confirms the attenuation rule. The tracking takes the stored temperature as a factor of transverse comparison and time as a variable for observation. The tracking results are shown in fig. 4.
According to the attenuation law, the following can be found:
1. the lower the temperature, the faster the contact angle rises, and the more pronounced the decay of the dyne value.
2. The contact angle increases to some extent with time.
According to the above decay law, it is necessary to ensure that the dyne value is stable at 33dyn within 3 months, and the initial dyne value after production is at least required to be ensured at 38 dyn. And care needs to be taken to ensure a certain temperature environment during production and storage.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; 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; 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; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the invention.
Claims (10)
1. The production process of the aluminum foil for the dynein double-sided photocell is characterized by comprising the following steps of:
step 1, carrying out rough rolling processing on an aluminum foil material;
step 2, carrying out medium rolling and finish rolling on the roughly rolled aluminum foil material;
step 3, slitting and processing the aluminum foil after the middle rolling and the finish rolling;
step 4, rewinding the cut aluminum foil;
and 5, packaging the reversely rolled aluminum foil.
2. The method of claim 1The production process of the aluminum foil for the high dyne double-sided photocell is characterized in that in the step 2, oil indexes are required to be controlled when the aluminum foil material is subjected to medium rolling and finish rolling processing, so that the surface cleanliness and the surface initial wetting tension of the aluminum foil after the rolling of a rolling mill can be ensured; the oil control indexes are as follows: viscosity: 1.7-2.0 mm at 40 deg.C2S; residual oil mass: less than or equal to 8 ml; light transmittance: more than or equal to 90 percent; ester content: 8.0% -12%; alcohol content: 0.5-1.5%; the colloid content is as follows: less than or equal to 10 g/L.
3. The process of claim 1, wherein in step 2, the aluminum foil is subjected to intermediate rolling and finish rolling at a purge partial pressure of 0.4 to 0.6Mpa and a rolling speed of 500 to 700 m/min.
4. The process for producing aluminum foil for a dyne double-sided photovoltaic cell as claimed in claim 1, wherein in the step 2, the roll diameter of the roll is 270-280mm, the roll crown is 60-100 permillage, the roll roughness is 0.10-0.15 μm, the rolling reduction of the medium rolling and the finish rolling is controlled between 35-45%, and the oil temperature of the rolling oil is more than or equal to 45 ℃.
5. The process for producing the aluminum foil for the dyne-double-sided photovoltaic cell according to claim 1, wherein in the step 3, when the aluminum foil is cut, the aluminum foil is rolled and then is circulated to a cutting process within 4 hours, if the circulation time exceeds 4 hours, the whole coil is kept in a furnace, the surface temperature of the aluminum foil is ensured to be more than or equal to 30 ℃ in the cutting process, a heat preservation device is installed on the cutting machine, and the peripheral temperature of the heat preservation device is ensured to be more than or equal to 60 ℃; the distance between the device and the material surface is less than or equal to 30 cm.
6. The process of claim 1, wherein in step 3, the aluminum foil is cut at a speed of 300m/min or less.
7. The process of claim 1, wherein in step 3, the guide roller of the slitting machine is wiped once per minute of the slit car, and the oil evaporated above the surface treatment device is cleaned without any shift.
8. The process of claim 1, wherein in step 4, the aluminum foil is treated by high-temperature discharge during rewinding, so as to break up the oil film on the surface of the aluminum foil instantaneously, ozone generated by high-voltage discharge can effectively prevent functional groups on the surface from being broken up from polymerizing, and the negative-pressure discharge end can suck away the oil gas from the surface treatment, thereby reducing the surface residual oil and improving the dyne value.
9. The process of claim 1, wherein in step 4, the rewinding speed of the aluminum foil is less than or equal to 100m/min, the distance between the discharge rewinding device and the surface of the aluminum foil is less than or equal to 2mm, the power of the discharge rewinding device is 10-15 KW, and the number of the aluminum foils to be simultaneously processed is 6.
10. The process of claim 1, wherein in the step 5, the aluminum foil is packaged by covering the surface of the foil with a layer of pearl cotton and then with a layer of PE film, and the end face of the foil is covered with round pearl cotton; the covered PE film is fastened and fixed by a rubber band to prevent air from entering; packaging the aluminum foil coil by using an aluminum plastic film packaging material with good tightness; introducing inert gas into the aluminum foil during sealing to prevent the aluminum foil from contacting air; the tube core used for packaging is protected, and the package is prevented from being damaged in the transportation process.
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