CN114411017A - Aluminum foil for 1200 lithium battery and preparation method thereof - Google Patents
Aluminum foil for 1200 lithium battery and preparation method thereof Download PDFInfo
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 89
- 239000011888 foil Substances 0.000 title claims abstract description 80
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 35
- 238000007670 refining Methods 0.000 claims description 30
- 229910000838 Al alloy Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 238000003723 Smelting Methods 0.000 claims description 15
- 238000005097 cold rolling Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000003851 corona treatment Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000010731 rolling oil Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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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- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
- H01M4/662—Alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses an aluminum foil for a 1200 lithium battery, and belongs to the technical field of lithium battery aluminum foils. The aluminum foil for the 1200 lithium battery comprises the following components in percentage by mass: si: 0.2% -0.4%, Fe: 0.3% -0.5%, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.05 percent, Mg: less than or equal to 0.03%, Zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, Ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum; and the mass percent of the aluminum is more than or equal to 99.00 percent. The invention also discloses a preparation method of the aluminum foil for the 1200 lithium battery. By adopting the aluminum foil for the 1200 lithium battery and the preparation method thereof, the problems of low tensile strength and elongation of the conventional aluminum foil can be solved.
Description
Technical Field
The invention relates to the technical field of lithium battery aluminum foils, in particular to a 1200 lithium battery aluminum foil and a preparation method thereof.
Background
Aluminum alloy is a current collector of positive electrode material for lithium ion battery by virtue of its excellent conductivity, low density, good corrosion resistance and low price. In recent years, aluminum foils for positive collectors of lithium ion batteries (aluminum foils for lithium batteries for short) have been developed rapidly, and particularly, with rapid development of new energy vehicles and urgent needs of large energy storage devices, aluminum foils serve as one of indispensable components of lithium ion batteries and play an increasingly important role in the development of lithium ion batteries. Under the condition of certain thickness and quality, the tensile strength and the elongation of the aluminum foil are improved, which is necessary for improving the performance of the lithium ion battery. The development of the aluminum foil current collector with high performance and high elongation rate has great significance for improving the excellent performance of the lithium ion battery and the overall technical level of the industry. The existing aluminum foil has low tensile strength and elongation rate and cannot meet the use requirements of high-performance lithium ion batteries.
Disclosure of Invention
The invention aims to provide an aluminum foil for a 1200 lithium battery, which solves the problems of low tensile strength and elongation of the conventional aluminum foil. The invention also aims to provide a preparation method of the aluminum foil for the 1200 lithium battery.
In order to achieve the purpose, the invention provides a 1200 lithium battery aluminum foil which comprises the following components in percentage by mass: si: 0.2% -0.4%, Fe: 0.3% -0.5%, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.05 percent, Mg: less than or equal to 0.03%, Zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, Ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum; and the mass percent of the aluminum is more than or equal to 99.00 percent.
Preferably, the Fe/Si mass ratio is 1.0-2.0.
The preparation method of the aluminum foil for the 1200 lithium battery comprises the following steps:
s1, blending, namely weighing corresponding raw materials according to component design;
s2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting, and refining the aluminum alloy liquid after the raw materials are completely molten;
s3, filtering, namely performing double filtering by adopting a tubular filter box and ceramic filter sheets; the filtering temperature is 710 ℃ and 730 ℃;
s4, casting and rolling, wherein the filtered aluminum alloy liquid is injected into a casting and rolling machine through a runner for continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm;
s5, cold rolling, namely cold rolling the cast-rolled plate to obtain a cold-rolled plate with the thickness of 0.24 mm;
s6, foil rolling, namely foil rolling the cold-rolled sheet to obtain a foil with the thickness of 0.013-0.015 mm;
s7, slitting, namely, putting the foil into a slitting machine for slitting, wherein the aluminum foil passes through a pinhole detector and a baking device in the slitting process; fine cutting is carried out after slitting, and surface corona treatment is carried out in the fine cutting process;
and S8, packaging and warehousing.
Preferably, in step S1, the raw material includes aluminum alloy scrap with a mass percentage not higher than 25%, and the rest aluminum is pure aluminum ingot.
Preferably, in the step S2, the hydrogen content in the molten aluminum is less than or equal to 0.12ml/100gAl, pure argon is adopted to spray a refining agent into the melt for refining, the refining is carried out in a smelting furnace for 1-2 times, and the refining time in the smelting furnace is more than or equal to 30 min/time; refining in a standing furnace for 1-2 times, wherein the refining time in the standing furnace is more than or equal to 20 min/time, and performing overcurrent refining when turning down; the refining temperature is more than or equal to 730 ℃; the refining frequency is once every 4-5 hours.
Preferably, in the step S4, the casting and rolling speed is 900 +/-100 mm/min, the length of the casting and rolling area is 50-70mm, the roll surface temperature is less than or equal to 110 ℃, the same plate difference of the obtained cast and rolled plate is 0-0.03mm, the longitudinal plate difference is 0-0.12mm, and the convexity is 0-0.03 mm.
Preferably, in the step S5, the cold rolling passes are respectively (6.5-8.0) mm-4.5mm-2.9mm-1.9mm-1.15mm-0.7mm-0.38mm-0.24 mm.
Preferably, in the step S6, the reduction passes of the finished product with a thickness of 0.015mm are respectively 0.24mm-0.12mm-0.065mm-0.032mm-0.02mm-0.015 mm.
Preferably, in the step S6, the reduction passes of the finished product with the thickness of 0.013mm are respectively 0.24mm-0.12mm-0.065mm-0.030mm-0.018mm-0.013 mm.
The tensile strength of the aluminum foil with the thickness of 0.013mm and double-sided light prepared by the method is more than or equal to 236MPa, and the elongation is more than or equal to 4.0 percent; the tensile strength of the aluminum foil with the thickness of 0.015mm is more than or equal to 235MPa, and the elongation is more than or equal to 4.5 percent.
The aluminum foil for the 1200 lithium battery and the preparation method thereof have the advantages and positive effects that:
1. the 1200 aluminum alloy of the invention is added with higher Fe and Si, and ensures that the mass ratio of Fe/Si is 1.0-2.0, breaks through the theory that the Fe/Si ratio in the traditional double-zero aluminum foil product is not lower than 2.0, and forms more alpha Al in the aluminum matrixxA (Fe, Si) second phase,the alpha second phase has smaller size and is uniformly dispersed in the aluminum matrix, thereby being beneficial to improving the tensile strength and the elongation of the aluminum alloy.
2. During casting and rolling, the mode of the tubular filter box and the ceramic filter plate is adopted for double filtration, the purity of the molten aluminum can be improved by adopting double filtration, and the defect rates of pinholes, air passages, slag inclusion and the like in the cast-rolled plate are reduced.
3. In the cold rolling and foil rolling processes of aluminum foil production, annealing treatment is not carried out, the product has high strength and high work hardening degree, and the tensile strength of the final product is favorably improved. By adjusting the alloy components and controlling the rolling process, the problem that the plate shape of the plate is difficult to control due to work hardening in the rolling process is solved, and the surface quality of the product is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is an SEM photograph of a rolled second phase morphology of an aluminum foil for a 1200 lithium battery and a preparation method thereof according to an embodiment of the invention;
FIG. 2 is a graph of EDS spectrum analysis of a second phase of an example of an aluminum foil for a 1200 lithium battery and a method for preparing the same according to the present invention;
fig. 3 shows the result of EDS spectrum analysis of the second phase of an example of an aluminum foil for a 1200 lithium battery and a method for manufacturing the same according to the present invention.
Detailed Description
The following examples further illustrate the technical solution of the present invention.
The invention relates to a method for preparing a flexible printed circuit board, which comprises the following steps of 1200: the method is characterized in that the alloy components are adjusted on the basis of the components of the national standard 1200 aluminum alloy, and finally, the pure aluminum content is not less than 99.00 percent.
Aluminum foil for lithium battery: the aluminum foil is suitable for aluminum foil products for lithium ion battery current collectors, and is mainly applied to the fields of batteries for digital electronic products such as mobile phones, flat panels and computers, lithium battery energy storage batteries, batteries for new energy automobile batteries and the like.
An aluminum foil for a 1200 lithium battery comprises the following components in percentage by mass: si: 0.2% -0.4%, Fe: 0.3% -0.5%, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.05 percent, Mg: less than or equal to 0.03%, Zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, Ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum; and the mass percent of the aluminum is more than or equal to 99.00 percent.
The mass ratio of Fe/Si is 1.0-2.0.
The 1200 aluminum alloy is added with higher Fe and Si, and the mass ratio of Fe/Si is ensured to be 1.0-2.0, so that the theory that the Fe/Si ratio in the traditional aluminum foil product is not lower than 2.0 is broken, and the aluminum content in the aluminum alloy is ensured to be in the range required by customers.
Within the range of the alloy composition of the invention, more alpha Al is formedxThe (Fe, Si) second phase, the alpha second phase has smaller size and is uniformly dispersed in the aluminum matrix, thereby being beneficial to improving the tensile strength and the elongation of the aluminum alloy.
The preparation method of the aluminum foil for the 1200 lithium battery comprises the following steps:
s1, mixing, and weighing corresponding raw materials according to the component design. The raw materials comprise aluminum alloy waste materials with the mass percentage not higher than 25%, and the rest aluminum is pure aluminum ingot. The waste material of the aluminum alloy can be reused, and the material cost is reduced. The waste and the surface of the aluminum ingot are clean and clean, the proportion of the waste is strictly controlled, and the high proportion of the waste is not beneficial to controlling the quality of the melt.
S2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting, wherein furnace burden is kept clean, the melt quality is good, and the production requirement of aluminum foil is met. And refining the aluminum alloy liquid after the raw materials are completely melted. The hydrogen content in the aluminum water is less than or equal to 0.12ml/100gAl, pure argon is adopted to spray a refining agent into the melt for refining, the refining is carried out for 1-2 times in a smelting furnace, and the refining time in the smelting furnace is more than or equal to 30 min/time; refining in a standing furnace for 1-2 times, wherein the refining time in the standing furnace is more than or equal to 20 min/time, and performing overcurrent refining when turning down; the refining temperature is more than or equal to 730 ℃; the refining frequency is once every 4-5 hours.
And S3, filtering, and performing double filtration by adopting a tubular filter box and ceramic filter sheet mode. The filtration temperature was 710 ℃ and 730 ℃. The double filtration can improve the purity of the aluminum liquid and reduce the defect rate of pinholes, air passages, slag inclusion and the like in the cast-rolling plate.
S4, casting and rolling, and injecting the filtered aluminum alloy liquid into a casting and rolling machine through a runner for continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm. The casting and rolling speed is 900 +/-100 mm/min, the length of a casting and rolling area is 50-70mm, the temperature of a roll surface is less than or equal to 110 ℃, and the obtained cast and rolled plate has the same plate difference of 0-0.03mm, the longitudinal plate difference of 0-0.12mm and the convexity of 0-0.03 mm. The plate-shaped curve is parabolic, and the defects of wedge-shaped plates, rib thickness (concave plates) and the like are avoided.
And S5, cold rolling, namely cold rolling the cast-rolled plate, and obtaining a cold-rolled plate with the thickness of 0.24mm after cold rolling. The cold rolling passes are respectively (6.5-8.0) mm-4.5mm-2.9mm-1.9mm-1.15mm-0.7mm-0.38mm-0.24 mm. The rolling reduction and the rolling pass are slightly different according to the width of the cast rolling blank.
The process parameters in the cold rolling are shown in table 1.
Aluminum foil cold rolling technological parameters for table 11200 lithium battery
Controlling the quality of the plate shape during cold rolling:
firstly, after the working roll is replaced each time, the roller needs to be preheated for more than 10 minutes, and before the finished product passes, 2-3 rolls of thick materials need to be produced, so that the thermal convexity of the roller is improved, and the roller shape is stabilized.
And secondly, when the roller is replaced and maintained regularly, the plate shape control system is ensured to be normal.
Surface quality control during cold rolling:
firstly, a material roll is cleaned before feeding, and no dust or foreign matters are ensured.
And secondly, cleaning the roller during roller replacement, and cleaning the five rollers, the guide roller and the plate type roller before production.
And thirdly, before the finished product is produced, whether the roller state meets the surface requirement of the product or not is confirmed, and whether the roller mark, the surface stripe and other defects exist on the surface of the first roll of the finished product or not is checked in the previous pass/produced finished product, so that the batch surface defects are avoided.
And fourthly, ensuring the rolling oil filtering system to be normal so as to ensure the quality of the rolling surface.
And S6, foil rolling, namely foil rolling the cold-rolled plate to obtain a foil with the thickness of 0.013-0.015 mm.
The reduction passes of the finished product with the thickness of 0.015mm are respectively 0.24mm-0.12mm-0.065mm-0.032mm-0.02mm-0.015 mm.
The pressing passes of the finished product with the thickness of 0.013mm are respectively 0.24mm-0.12mm-0.065mm-0.030mm-0.018mm-0.013 mm.
The roll service in the final pass is shown in table 2.
TABLE 21200 aluminum foil finished product pass roller condition for lithium battery
| Thickness of finished product mm | Roller convexity thousandths | Roughness (Ra) of roller |
| 0.013/0.015 | 65 | 0.10-0.15 |
The rolling oil requirements in foil rolling are shown in table 3.
TABLE 31200 Rolling oil requirements in production of aluminum foil for lithium batteries
Control of strip shape in foil rolling
Firstly, multi-pass small reduction rolling is adopted in foil rolling production.
Secondly, before finished products are obtained, rolling the small coils for detecting the shape of the plate, and adjusting the rolled finished products of the plate shape according to the detection result of the shape of the plate.
And S7, slitting, namely putting the foil into a slitting machine to slit into small roll diameters. The aluminum foil is subjected to pinhole detection through a pinhole detector in the slitting process, and is subjected to baking surface degreasing treatment through a baking device, so that good quality of product pinholes and reduced surface oil quantity are ensured. And cutting, performing fine cutting, and performing secondary cutting on fine cutting equipment to obtain the width specification required by a customer. And carrying out surface corona treatment in the fine cutting process to improve the surface dyne value of the aluminum foil, improve the wettability of the surface of the aluminum foil and facilitate subsequent spraying treatment.
And S8, packaging and warehousing.
The present invention will be further described with reference to the following examples, which are provided for the purpose of illustrating the present invention, and the scope of the present invention is not limited by the following examples. The cost ratios of the aluminum alloys in examples 1 to 4 are shown in Table 4.
Table 41200 composition table of aluminum foil example for lithium battery
The aluminum alloys of the above examples were rolled into aluminum foils having a thickness of 0.013mm, a double-sided gloss and a thickness of 0.015mm, and mechanical property measurements were carried out, and the results are shown in table 5.
TABLE 51200 mechanical Properties of aluminum foil examples for lithium batteries
The aluminum foil with the thickness of 0.013mm and double-sided light prepared by the aluminum foil for the 1200 lithium battery and the preparation method thereof has the tensile strength of more than or equal to 236MPa and the elongation of more than or equal to 4.0 percent; the tensile strength of the aluminum foil with the thickness of 0.015mm is more than or equal to 235MPa, and the elongation is more than or equal to 4.5 percent.
Therefore, the aluminum foil for the 1200 lithium battery and the preparation method thereof can solve the problems of low tensile strength and elongation of the conventional aluminum foil.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (10)
1. The aluminum foil for the 1200 lithium battery is characterized by comprising the following components in percentage by mass: si: 0.2% -0.4%, Fe: 0.3% -0.5%, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.05 percent, Mg: less than or equal to 0.03%, Zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, Ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum; and the mass percent of the aluminum is more than or equal to 99.00 percent.
2. The aluminum foil for a 1200 lithium battery as claimed in claim 1, wherein: the mass ratio of Fe/Si is 1.0-2.0.
3. The method for preparing an aluminum foil for a 1200 lithium battery as claimed in any one of claims 1 to 2, comprising the steps of:
s1, blending, namely weighing corresponding raw materials according to component design;
s2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting, and refining the aluminum alloy liquid after the raw materials are completely molten;
s3, filtering, namely performing double filtering by adopting a tubular filter box and ceramic filter sheets; the filtering temperature is 710 ℃ and 730 ℃;
s4, casting and rolling, wherein the filtered aluminum alloy liquid is injected into a casting and rolling machine through a runner for continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm;
s5, cold rolling, namely cold rolling the cast-rolled plate to obtain a cold-rolled plate with the thickness of 0.24 mm;
s6, foil rolling, namely foil rolling the cold-rolled sheet to obtain a foil with the thickness of 0.013-0.015 mm;
s7, slitting, namely, putting the foil into a slitting machine for slitting, wherein the aluminum foil passes through a pinhole detector and a baking device in the slitting process; fine cutting is carried out after slitting, and surface corona treatment is carried out in the fine cutting process;
and S8, packaging and warehousing.
4. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S1, the raw material includes aluminum alloy scrap with a mass percentage not higher than 25%, and the rest aluminum is pure aluminum ingot.
5. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S2, the hydrogen content in the molten aluminum is less than or equal to 0.12ml/100gAl, pure argon is adopted to spray a refining agent into the melt for refining, the refining is carried out in a smelting furnace for 1-2 times, and the refining time in the smelting furnace is more than or equal to 30 min/time; refining in a standing furnace for 1-2 times, wherein the refining time in the standing furnace is more than or equal to 20 min/time, and performing overcurrent refining when turning down; the refining temperature is more than or equal to 730 ℃; the refining frequency is once every 4-5 hours.
6. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S4, the casting and rolling speed is 900 +/-100 mm/min, the length of the casting and rolling area is 50-70mm, the temperature of the roll surface is less than or equal to 110 ℃, the same plate difference of the obtained cast and rolled plate is 0-0.03mm, the longitudinal plate difference is 0-0.12mm, and the convexity is 0-0.03 mm.
7. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S5, the cold rolling passes are respectively (6.5-8.0) mm-4.5mm-2.9mm-1.9mm-1.15mm-0.7mm-0.38mm-0.24 mm.
8. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S6, the reduction passes of the finished product with the thickness of 0.015mm are respectively 0.24mm-0.12mm-0.065mm-0.032mm-0.02mm-0.015 mm.
9. The method of claim 3, wherein the aluminum foil for the lithium 1200 battery comprises: in the step S6, the pressing passes of the finished product with the thickness of 0.013mm are respectively 0.24mm-0.12mm-0.065mm-0.030mm-0.018mm-0.013 mm.
10. The method of manufacturing an aluminum foil for a 1200 lithium battery as claimed in any one of claims 4 to 9, wherein: the tensile strength of the prepared aluminum foil with the thickness of 0.013mm and double-sided light is more than or equal to 236MPa, and the elongation is more than or equal to 4.0 percent; the tensile strength of the aluminum foil with the thickness of 0.015mm is more than or equal to 235MPa, and the elongation is more than or equal to 4.5 percent.
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