CN114669622A - Preparation method of battery aluminum foil and battery aluminum foil - Google Patents
Preparation method of battery aluminum foil and battery aluminum foil Download PDFInfo
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- CN114669622A CN114669622A CN202210294612.0A CN202210294612A CN114669622A CN 114669622 A CN114669622 A CN 114669622A CN 202210294612 A CN202210294612 A CN 202210294612A CN 114669622 A CN114669622 A CN 114669622A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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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
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- 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
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a preparation method of a battery aluminum foil and the battery aluminum foil, wherein the preparation method of the battery aluminum foil sequentially comprises the following steps: raw material formulaPreparing by adopting a semi-continuous casting method to obtain an ingot; milling the cold interlayer and the segregation layer of the cast ingot; heating the milled cast ingot by using a heating furnace; carrying out hot continuous rolling on the ingot after the heating treatment to obtain a hot rolled blank; cold rolling the hot rolled blank to obtain an aluminum foil blank; and carrying out foil rolling on the aluminum foil blank to obtain the battery aluminum foil. The thickness of the battery aluminum foil prepared by the invention is kept between 0.01 mm and 0.015mm, the tensile strength reaches 220 Mpa to 235Mpa, the elongation reaches 4.8 to 6.0 percent, the surface quality is better and has no color difference defect, and the surface wetting tension value can reach 35 multiplied by 10‑3N/m, and can keep 15 seconds and can not appear breaking into the phenomenon of droplet, the pinhole number is less than 0.006 per square meter, and the plate-shaped volume of collapsing is less than 0.5mm to satisfy new forms of energy car power battery to the requirement of battery aluminium foil.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of aluminum processing, in particular to a preparation method of a battery aluminum foil and the battery aluminum foil.
[ background of the invention ]
The development of new energy automobiles is an important measure for coping with climate change and promoting green development, and at present, compared with the traditional gasoline-driven automobiles, the new energy automobiles are more energy-saving and pollution-free. Especially, the pure electric vehicle driven by the power battery is better appreciated by users.
The electric power source of the electric automobile is basically a lithium ion power battery, which is a mobile energy source consisting of an anode, a cathode and an electrolyte, and the aluminum foil of the battery is required for the anode.
The existing battery aluminum foil has the defects of more pinholes, low strength, poor surface quality and poor plate shape, and can not meet the requirements of power batteries on the battery aluminum foil.
Therefore, it is necessary to provide a method for preparing a battery aluminum foil and a battery aluminum foil to solve the above problems.
[ summary of the invention ]
The embodiment of the invention aims to provide a preparation method of a battery aluminum foil and the battery aluminum foil, and aims to solve the problems that the existing battery aluminum foil has many pinholes, low strength, poor surface quality and poor plate shape, so that the requirement of a power battery on the battery aluminum foil cannot be met.
In a first aspect, an embodiment of the present invention provides a method for preparing a battery aluminum foil, including the following steps:
step S1, preparing a raw material formula by adopting a semi-continuous casting method to obtain a cast ingot;
the raw material formula comprises the following components in percentage by mass: 0.02-0.06% of Si, 0.10-0.16% of Fe, 0.02-0.029% of Cu, less than 0.005% of Mg, less than 0.005% of Mn, less than 0.01% of Zn, 0.008-0.014% of Ti and more than 99.70% of Al, wherein the element Si adopts AlSi20 intermediate alloy, the element Fe adopts aluminum type ferreous 80FeAl, the element Cu adopts AlCu20 intermediate alloy, and the element Ti adopts aluminum titanium boron wire which is used as an online grain refiner;
step S2, milling the cold separation layer and the segregation layer of the cast ingot;
step S3, performing heating treatment on the milled cast ingot by using a heating furnace, wherein the heating treatment comprises homogenizing heating and heat preservation heating;
step S4, carrying out hot continuous rolling on the ingot after the heating treatment to obtain a hot rolled blank with the thickness of 6.0-8.5mm, wherein the final rolling temperature of the hot continuous rolling is 320-330 ℃, the hot continuous rolling comprises hot rough rolling and hot finish rolling, the hot rough rolling has 21 passes, the 15 th pass, the 17 th pass, the 19 th pass and the 21 st pass are all thrown into a brush roller, and the whole process of the hot finish rolling is thrown into the brush roller;
step S5, cold rolling the hot rolled blank to obtain an aluminum foil blank with the thickness of 0.15-0.25mm, wherein the thickness of the intermediate blank is 4.0-6.0mm when the cold rolling is carried out to the intermediate pass, cleaning the intermediate blank after the cold rolling is carried out to the intermediate pass, carrying out complete recrystallization annealing after cleaning, and then carrying out rolling of the rest passes;
and step S6, carrying out foil rolling on the aluminum foil blank to obtain the battery aluminum foil with the thickness of 0.01-0.015 mm.
Preferably, in step S1, the semi-continuous casting method sequentially includes the steps of batching, smelting, refining, slagging off, converter refining, slagging off, standing, degassing, filtering, and casting, and after the ingot is obtained, the dummy ingot head portion and the sprue portion are sawed.
Preferably, the joints of the movable casting launders and the fixed casting launders are connected by adopting aluminum silicate cotton materials, the content of slag balls with the grain diameter larger than 0.2mm in the aluminum silicate cotton is less than 3 percent, the heat conductivity coefficient of the aluminum silicate cotton is 0.1-0.12W/m.Kelvin, and the aluminum silicate cotton is made of Al2O3And SiO2Composition of, wherein, the Al2O3And the SiO2Is more than 99.5 percent.
Preferably, in step S2, the milling is performed by using a face milling machine, and a cutter disc of the face milling machine is spray-lubricated by using D100 rolling base oil.
Preferably, in the step S3, before the milled ingot enters the heating furnace, the hearth of the heating furnace is cleaned by a dust collector, and the upper surface and the lower surface of the ingot are cleaned by a cleaning agent, wherein the number of times of cleaning is three, the cleaning agent is used for wetting and cleaning for the first time and the second time, and the dry cleaning agent is used for cleaning for the third time.
Preferably, in step S4, before the heated ingot is subjected to hot continuous rolling, washing equipment is used to wash the upper surface and the lower surface of the ingot, the brush rolls for hot rough rolling and hot finish rolling are washed by off-line equipment, and two end faces of the hot rolled blank are welded by argon arc for 4 points, wherein the off-line equipment is ultrasonic washing equipment, the washing medium is kerosene for 30-40min, two points are welded on each end face of the hot rolled blank, an inner ring is welded on the 2 nd to 3 rd layer, and an outer ring is welded on the 2 nd to 3 rd layer.
Preferably, in step S5, a combination of fly filter element, clay and diatomite is used as the filter aid in the cold-rolled oil plate type filtration system, 5t of rolled oil, 5kg of fly filter element, 5-8kg of clay and 60kg of diatomite are added into an oil stirring tank in a precoating stage in the cold-rolled filtration process to form a filter cake with a thickness of 7-9mm, and 5kg of fly filter element, 5-8kg of clay and 20kg of diatomite are added into a filtration stage in the filtration process.
Preferably, in the step S5, the cold rolling is lubricated by rolling oil, and in the cold rolling process, the surface of the strip at the uncoiling position of the cleaning machine line is sprayed by D40 solvent oil and then washed by water, wherein the bromine number of the rolling oil is less than 10mgBr/100g, the rolling oil comprises base oil and additives, and the aniline point of the base oil is 80-90 ℃.
Preferably, in the step S6, a flocculant of hydrocarbon anion functional group is added into the rolling oil of the foil rolling, the rolling force of the foil rolling in the middle pass is 2800-3000KN, the rolling force of the last pass is 2200-2400KN, and the outlet coiling tensile stress of each pass is 35 MPa.
In a second aspect, the embodiment of the invention provides a battery aluminum foil, which is prepared by the above preparation method of the battery aluminum foil, and the battery aluminum foil is applied to a power battery of an energy vehicle.
Compared with the prior art, the preparation method of the battery aluminum foil provided by the invention has the advantages that the battery aluminum foil is prepared by limiting the raw material formula and sequentially adopting the semi-continuous casting method, the milling, the heating treatment, the hot continuous rolling, the cold rolling and the foil rolling, the thickness of the battery aluminum foil can be kept between 0.01 and 0.015mm, the tensile strength reaches 220 to 235Mpa, the elongation reaches 4.8 to 6.0 percent, the surface quality is better without the defect of chromatic aberration, and the surface wetting tension value can reach 35 multiplied by 10-3N/m, can keep for 15 seconds without the phenomenon of breaking into small liquid drops, and the number of pinholes is less than 0.006 pieces per square meter, and the plate shape collapse amount is less than 0.5mm, thereby meeting the requirements of the power battery of the new energy vehicle on the battery aluminum foil.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic flow chart of a method for manufacturing a battery aluminum foil according to an embodiment of the present invention;
FIG. 2 is a table of rolling parameters for foil rolling according to an embodiment of the present invention;
fig. 3 is a graph illustrating the off-line shape gauge for detecting the shape sag of the battery aluminum foil according to the embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
As shown in fig. 1, an embodiment of the present invention provides a method for preparing a battery aluminum foil, including the following steps:
and step S1, preparing a raw material formula by adopting a semi-continuous casting method to obtain an ingot.
Specifically, the raw material formula comprises the following components in percentage by mass: 0.02-0.06% of Si, 0.10-0.16% of Fe, 0.02-0.029% of Cu, less than 0.005% of Mg, less than 0.005% of Mn, less than 0.01% of Zn, 0.008-0.014% of Ti and more than 99.70% of Al, wherein the element Si adopts AlSi20 intermediate alloy, the element Fe adopts aluminum type ferret 80FeAl, the element Cu adopts AlCu20 intermediate alloy, the element Ti adopts an aluminum titanium boron wire which is used as a grain refiner and the rest elements are not prepared additionally.
Specifically, the element Al is more than 99.70 percent, the aluminum foil prepared by the method is easy to chemically react with oxygen in the air, a layer of compact oxide film is generated on the surface of the aluminum foil to prevent the further reaction of the aluminum, and the thin oxide film has a certain protection effect on the aluminum in the electrolyte and can prevent the current collector from being oxidized. The surface oxide film of the aluminum foil is not dense and has pitting corrosion, and the lower the aluminum content in the aluminum foil is, the less dense the oxide film is, the more easily pitting corrosion occurs, thereby affecting the service life of the battery. The purer the aluminum alloy material is, the lower the weight of the power battery is, the higher the conductivity is, the smaller the heat productivity of the battery is, and the requirements of the power battery of a new energy automobile can be better met.
The traditional Fe agent is a fluxing agent except for Fe, non-metallic compounds are easy to generate slag inclusion, the purity of a melt is influenced, and the produced battery aluminum foil is easy to have more pinholes; FeAl easily exists in aluminum-iron intermediate alloy3And the coarse second phase can cause the performance of the produced battery aluminum foil to be deteriorated, and the battery aluminum foil is difficult to break even if the battery aluminum foil is rolled at a large processing rate, so that the pinhole phenomenon is increased greatly. The aluminum type ferrite used in this embodiment is composed of Fe and Al, which can avoid the above problem, i.e. reduce the number of pinholes.
Specifically, after the ingot is obtained, the dummy ingot head part and the sprue part of the ingot are sawed so as to completely saw the bad parts of the ingot.
The semi-continuous casting method comprises the steps of proportioning, smelting, refining, slagging off, converter refining, slagging off, standing, degassing, filtering and casting in sequence, wherein the joint of the cast movable launder and the cast fixed launder is connected by adopting an aluminum silicate cotton material, and the movable launder and the cast fixed launder are firm and do not leak aluminum water after being connected.
Specifically, the content of slag balls with the particle size of more than 0.2mm in the aluminum silicate cotton is less than 3%, the heat conductivity coefficient of the aluminum silicate cotton is 0.1-0.12W/m.Kelvin, and the aluminum silicate cotton is made of Al2O3And SiO2Composition of, wherein, the Al2O3And stationThe SiO2Is greater than 99.5%, and the thermal conductivity can also be expressed in units of W/(m.k).
The compact aluminum silicate cotton can ensure that aluminum silicate fibers and slag balls cannot fall into aluminum water to cause slag inclusion, and can avoid more pinholes in the obtained battery aluminum foil; the low heat conductivity coefficient causes the temperature of the aluminum water in the runner to be reduced less and the ingot casting structure to be compact.
And step S2, milling the cold separation layer and the segregation layer of the cast ingot.
Specifically, the milling can be performed on the cold interlayer and the segregation layer of the ingot, and can be performed on other parts according to actual requirements, and certainly, the milling needs to be guaranteed to be clean.
Specifically, the milling is performed by using a face milling machine, and a cutter disc of the face milling machine is sprayed and lubricated by using D100 rolling base oil. Therefore, the milled cast ingot can keep the smooth surface, and the defects of milling cutter marks, aluminum adhesion and the like which influence the appearance of more pinholes on the battery aluminum foil are avoided.
The D100 rolling base oil is volatile relative to traditional high-viscosity milling cutter oil, the surface of the cast ingot can be kept dry to the greatest extent, the traditional milling cutter oil can enable a layer of thick oil film to be attached to the surface of the cast ingot, foreign matters such as aluminum dust, aluminum scraps, dust and the like are gathered, the risk of pinholes of a battery aluminum foil is greatly increased, and meanwhile, the D100 rolling base oil is higher in price ratio and easier to obtain relative to the traditional milling cutter oil.
And step S3, heating the milled cast ingot by using a heating furnace.
Wherein the heating treatment comprises homogenization heating and heat preservation heating.
Specifically, before the milled cast ingot enters the heating furnace, a dust collector is adopted to clean the hearth of the heating furnace, so that foreign matters such as dust and the like do not exist in the hearth, and a clean hearth is kept.
Specifically, the ingot after milling gets into before the heating furnace, it is right to adopt the cleaner the upper surface and the lower surface of ingot clean, wherein, the number of times of cleaning is the cubic, adopts scouring pad to be stained with for the first time and the second time the cleaner wets and wipes, and dry scouring pad is wiped to the third time, the sanitizer has easily volatilizees and can not right the ingot surface produces the performance of adverse reaction. Therefore, the surface of the cast ingot is clean and free of foreign matters, and the phenomenon that a battery aluminum foil has more pinholes is avoided.
And step S4, carrying out hot continuous rolling on the ingot after the heating treatment to obtain a hot-rolled blank with the thickness of 6.0-8.5 mm.
Specifically, the final rolling temperature of the hot continuous rolling is 320-330 ℃, the hot continuous rolling comprises hot rough rolling and hot finish rolling, the hot rough rolling comprises 21 passes, the 15 th pass, the 17 th pass, the 19 th pass and the 21 st pass are all fed into the brush roll, and the whole hot finish rolling is fed into the brush roll. Therefore, the quality of the roll surface of each roll can be ensured to be uniform and good in the rolling process.
Specifically, before the ingot after the heating treatment is subjected to hot continuous rolling, washing equipment is adopted to wash the upper surface and the lower surface of the ingot, and ionized water is adopted during washing. Therefore, the surface of the cast ingot is clean and free of foreign matters, and the phenomenon that a battery aluminum foil has more pinholes is avoided.
Specifically, the brush rolls for hot rough rolling and hot finish rolling are cleaned by off-line equipment, wherein the off-line equipment is ultrasonic cleaning equipment, and the cleaning medium is kerosene for 30-40 min. Therefore, the brush bristles of the cleaned brush roller are free of non-metal foreign matters such as aluminum powder and the like, and the phenomenon that the aluminum foil of the battery is pressed in due to the pollution of the roller is avoided.
Specifically, the two end faces of the hot-rolled blank are welded with 4 points through argon arc welding, wherein two points are welded on each end face of the hot-rolled blank, the inner ring is welded at the 2 nd to 3 rd layers, and the outer ring is welded at the 2 nd to 3 rd layers. Therefore, the defects of sticking, interlayer scratching and the like caused by cooling and shrinkage of the hot-rolled blank can be prevented, so that the surface quality of the battery aluminum foil is improved, and the problem of more pinholes is avoided.
And step S5, cold rolling the hot rolled blank to obtain an aluminum foil blank with the thickness of 0.15-0.25 mm.
Specifically, when the cold rolling is carried out to the middle pass, the thickness of the middle blank is 4.0-6.0mm, after the cold rolling is carried out to the middle pass, the middle blank is cleaned, and after the cleaning, the complete recrystallization annealing is carried out, and then the rolling of the rest passes is carried out.
The intermediate blank is a hot-rolled blank when the hot-rolled blank is subjected to the cold rolling to an intermediate pass.
Specifically, the filter aid in the cold-rolled rolling oil plate type filtering system is a combination of fly filter element, white clay and diatomite, 5t of rolling oil, 5kg of fly filter element, 5-8kg of white clay and 60kg of diatomite are added into a stirring oil tank in a pre-coating stage in the cold-rolled filtering process to form a filter cake with the thickness of 7-9mm, and 5kg of fly filter element, 5-8kg of white clay and 20kg of diatomite are added in a filtering stage in the filtering process. Compared with the traditional filtering process adopting pure argil and diatomite, the method can reduce the usage amount of the diatomite by 85-90%.
The larger the filter aid usage amount is, the larger the risk of causing battery aluminum foil pinholes in the rolling oil is, and according to the filtering process of the embodiment, the light transmittance of the rolling oil can be ensured to reach more than 95%, and aluminum powder, iron powder and SiO which fall off from the roller can not be generated2And pressing foreign matters into the aluminum foil blank to avoid the defect that the aluminum foil of the battery has more pinholes. Meanwhile, clean cold-rolled rolling oil can create a precondition for the qualification of the surface wetting tension value of the battery aluminum foil.
Specifically, the cold rolling is lubricated by rolling oil, wherein the bromine number of the rolling oil is less than 10mgBr/100g, the ratio of unsaturated hydrocarbon is low, the rolling oil comprises base oil and additives, and the aniline point of the base oil is 80-90 ℃. Therefore, the rolling oil has good wettability to the surfaces of the roller and the aluminum foil blank, and simultaneously, the oil film lubricated by rolling is uniform, and the surface of the aluminum foil blank is uniform.
Specifically, in the cold rolling process, the surface of the strip at the uncoiling position of the line of the cleaning machine is sprayed with D40 solvent oil and then washed with water, and the D40 solvent oil is environment-friendly. Therefore, the D40 solvent oil is a non-polar substance, does not corrode and oxidize the surface of the aluminum material, has good compatibility with oil such as rolling lubricating oil, mechanical oil and the like, and is easier to remove residues of various substances, such as residues of polar elements such as S, P, Cl and the like, so that the surface deterioration is avoided, the phenomenon of more pinholes caused by aluminum powder sintering oxidation residues is avoided, and the surface of the aluminum foil of the battery is more excellent.
And step S6, carrying out foil rolling on the aluminum foil blank to obtain the battery aluminum foil with the thickness of 0.01-0.015 mm.
Specifically, a flocculant of hydrocarbon anion functional groups is added into the rolling oil of the foil rolling. Thus, aluminum powder, colloid and other substances which can influence the surface wetting tension of the aluminum foil in the rolling oil can be removed, so that the surface wetting tension value of the aluminum foil reaches 35 multiplied by 10-3N/m, and the material is kept for 15 seconds without being broken into small droplets, so that the surface wetting tension value is ensured to meet the requirement on the premise of not passing through a traditional corona roller.
Specifically, the rolling force of the foil rolling in the middle pass is 2800-3000KN, the rolling force of the last pass is 2200-2400KN, and the outlet coiling tensile stress of each pass is 35 MPa. By controlling the rolling force parameters of each pass, the actual roll gap shape in rolling can be constant.
In addition, as shown in fig. 2, according to actual requirements, the rolling parameters of each pass in the foil rolling may also be adaptively adjusted.
Specifically, in the embodiment, the plate shape is automatically detected by the plate-shaped roller by adopting an air differential pressure method, and the constant outlet coiling tensile stress is beneficial to better optimizing a plate shape feedback mechanism of the plate-shaped roller for adjustment. And the coiling tensile stress at the outlet is too large or too small, or the change of the coiling tensile stress at each pass is too large, so that the feedback of the plate-shaped roller has larger error, and the changes of technological parameters such as roller bending, rolling oil spraying and the like after the feedback can cause the change of the actual roller gap, which are not beneficial to the adjustment of the plate shape, thereby causing the poor plate shape of the final battery aluminum foil.
The air pressure difference method is characterized in that the plate-shaped roller mainly comprises a plurality of roller rings and a hollow shaft, when compressed air is introduced into the hollow shaft, an air cushion is formed, the roller rings are suspended, when the shape of the aluminum foil is poor, the pressure on each roller ring is not uniform, and the pressure is converted into an electric signal and then fed back to adjust the shape of the aluminum foil.
Therefore, the obtained shape of the battery aluminum foil can be made to be excellent by controlling the rolling process parameters such as the rolling force, the outlet coiling tensile stress and the like, and meanwhile, as shown in fig. 3, the shape collapse amount of the battery aluminum foil is automatically detected by using an off-line shape detector, and the collapse amount is less than 0.5mm, wherein the abscissa is the width of the aluminum foil, and the ordinate is the collapse amount detected by the shape, and the unit is mm. The plate-shaped collapse amount of the battery aluminum foil is defined as that the tensile stress of the battery aluminum foil is 0.6Kg/mm2The cell aluminum foil is uneven along the width direction of the foil, wherein the lowest point of the curve represents a zero value.
The rolling oil in the above different steps can be selected from the same rolling oil or different rolling oils according to actual requirements.
In the embodiment, the battery aluminum foil is prepared by limiting the raw material formula and sequentially adopting the semi-continuous casting method, the milling, the heating treatment, the hot continuous rolling, the cold rolling and the foil rolling, the thickness of the battery aluminum foil can be kept between 0.01 and 0.015mm, the tensile strength reaches 220 to 235Mpa, the elongation reaches 4.8 to 6.0 percent, the surface quality is better without the defect of chromatic aberration, and the surface wetting tension value can reach 35 multiplied by 10-3N/m, can be kept for 15 seconds without breaking into small liquid drops, the number of pinholes is less than 0.006 per square meter, and the plate-shaped collapse amount is less than 0.5 mm.
The aluminum foil of the battery used by the power battery needs to meet the conditions: the thickness is kept between 0.01 mm and 0.015mm, the tensile strength is more than 200Mpa, the elongation is more than 3 percent, the surface quality is excellent, no color difference exists, and the surface wetting tension value is more than 32 multiplied by 10-3N/m, the phenomenon of breaking into small liquid drops can be avoided within 10 seconds, the number of the pinholes is less than 3 per square meter, the plate-shaped collapse quantity is less than 8mm, and the technical effect achieved by the embodiment can meet the condition of the battery aluminum foil used by the power battery, so that the requirement of the power battery on the battery aluminum foil can be met.
The invention also provides another embodiment, which provides a battery aluminum foil, wherein the battery aluminum foil is prepared by the preparation method of the battery aluminum foil in the embodiment, and the battery aluminum foil in the embodiment is applied to a power battery of a new energy vehicle.
Since the battery aluminum foil in this embodiment is manufactured by the method for manufacturing a battery aluminum foil in the above embodiment, the battery aluminum foil in this embodiment can also achieve the technical effects achieved by the method for manufacturing a battery aluminum foil in the above embodiment, which are not described herein again.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The preparation method of the battery aluminum foil is characterized by comprising the following steps of:
step S1, preparing a raw material formula by adopting a semi-continuous casting method to obtain a cast ingot;
the raw material formula comprises the following components in percentage by mass: 0.02-0.06% of Si, 0.10-0.16% of Fe, 0.02-0.029% of Cu, less than 0.005% of Mg, less than 0.005% of Mn, less than 0.01% of Zn, 0.008-0.014% of Ti and more than 99.70% of Al, wherein the element Si adopts AlSi20 intermediate alloy, the element Fe adopts aluminum type ferreous 80FeAl, the element Cu adopts AlCu20 intermediate alloy, and the element Ti adopts aluminum titanium boron wire which is used as an online grain refiner;
step S2, milling the cold separation layer and the segregation layer of the cast ingot;
step S3, performing heating treatment on the milled cast ingot by using a heating furnace, wherein the heating treatment comprises homogenizing heating and heat preservation heating;
step S4, carrying out hot continuous rolling on the ingot after the heating treatment to obtain a hot rolled blank with the thickness of 6.0-8.5mm, wherein the final rolling temperature of the hot continuous rolling is 320-330 ℃, the hot continuous rolling comprises hot rough rolling and hot finish rolling, the hot rough rolling has 21 passes, the 15 th pass, the 17 th pass, the 19 th pass and the 21 st pass are all thrown into a brush roller, and the whole process of the hot finish rolling is thrown into the brush roller;
step S5, cold rolling the hot rolled blank to obtain an aluminum foil blank with the thickness of 0.15-0.25mm, wherein the thickness of the intermediate blank is 4.0-6.0mm when the cold rolling is carried out to the intermediate pass, cleaning the intermediate blank after the cold rolling is carried out to the intermediate pass, carrying out complete recrystallization annealing after cleaning, and then carrying out rolling of the rest passes;
and step S6, carrying out foil rolling on the aluminum foil blank to obtain the battery aluminum foil with the thickness of 0.01-0.015 mm.
2. The method for preparing the battery aluminum foil according to claim 1, wherein in the step S1, the semi-continuous casting method sequentially comprises the steps of batching, smelting, refining, slagging, converter refining, slagging, standing, degassing, filtering and casting, and the ingot is obtained and then the dummy bar part and the sprue part of the ingot are sawn.
3. The method for preparing the aluminum foil for the battery as claimed in claim 2, wherein the joints of the movable casting runner and the fixed casting runner are connected by using aluminum silicate cotton, the content of slag balls with the particle size of more than 0.2mm in the aluminum silicate cotton is less than 3%, the thermal conductivity of the aluminum silicate cotton is 0.1-0.12 w/m-kelvin, and the aluminum silicate cotton is made of Al2O3And SiO2Composition of, wherein, the Al2O3And the SiO2Is more than 99.5 percent.
4. The method for preparing the battery aluminum foil according to claim 1, wherein in the step S2, the milling is performed by using a face milling machine, and a cutter disc of the face milling machine is spray-lubricated by using D100 rolling base oil.
5. The method for preparing the battery aluminum foil according to claim 1, wherein in the step S3, before the milled ingot enters the heating furnace, a vacuum cleaner is used for cleaning a hearth of the heating furnace, and a cleaning agent is used for wiping the upper surface and the lower surface of the ingot, wherein the wiping is performed three times, the cleaning agent is used for wet wiping for the first time and the second time, and a dry cleaning cloth is used for wiping for the third time.
6. The method for preparing the battery aluminum foil according to claim 1, wherein in step S4, before the heated cast ingot is subjected to the hot continuous rolling, the upper surface and the lower surface of the cast ingot are washed by a washing device, the brush rolls for the hot rough rolling and the hot finish rolling are washed by an off-line device, and two end faces of the hot rolled blank are welded by argon arc for 4 points, wherein the off-line device is an ultrasonic washing device, the washing medium is kerosene for 30-40min, two points are welded on each end face of the hot rolled blank, an inner ring is welded on the 2 nd to 3 rd layers, and an outer ring is welded on the 2 nd to 3 rd layers.
7. The method of manufacturing aluminum foil for battery of claim 1, wherein in step S5, a combination of fly filter element, clay and diatomaceous earth is used as a filter aid in the cold-rolled oil-sheet filtration system, 5t of rolled oil, 5kg of fly filter element, 5-8kg of clay and 60kg of diatomaceous earth are added to a stirring oil tank in a precoating stage in the cold-rolled filtration process to form a filter cake with a thickness of 7-9mm, and 5kg of fly filter element, 5-8kg of clay and 20kg of diatomaceous earth are added to a filtration stage in the filtration process.
8. The method for preparing the aluminum foil for the battery according to claim 1, wherein in the step S5, the cold rolling is lubricated by rolling oil, and the surface of the strip at the uncoiling position of the cleaning machine line in the cold rolling process is sprayed by D40 solvent oil and then washed by water, wherein the bromine value of the rolling oil is less than 10mgBr/100g, the rolling oil comprises base oil and additives, and the aniline point of the base oil is 80-90 ℃.
9. The method for preparing the aluminum foil for the battery as claimed in claim 1, wherein in the step S6, the flocculant of the hydrocarbon anion functional group is added into the rolling oil of the foil rolling, the rolling force of the intermediate pass of the foil rolling is 2800-3000KN, the rolling force of the final pass of the foil rolling is 2200-2400KN, and the outlet coiling tensile stress of each pass is 35 MPa.
10. A battery aluminum foil, characterized in that the battery aluminum foil is manufactured by the method for manufacturing a battery aluminum foil according to any one of claims 1 to 9, and the battery aluminum foil is applied to power batteries of energy vehicles.
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Cited By (1)
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| CN115198129A (en) * | 2022-08-15 | 2022-10-18 | 浙江永杰铝业有限公司 | Preparation method of soft package battery aluminum foil and soft package battery aluminum foil |
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| CN114669622B (en) | 2023-09-29 |
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