CN114540647A - Method for preparing aluminum alloy for lithium battery soft package aluminum plastic film - Google Patents
Method for preparing aluminum alloy for lithium battery soft package aluminum plastic film Download PDFInfo
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- CN114540647A CN114540647A CN202210145429.4A CN202210145429A CN114540647A CN 114540647 A CN114540647 A CN 114540647A CN 202210145429 A CN202210145429 A CN 202210145429A CN 114540647 A CN114540647 A CN 114540647A
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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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- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- C22C1/03—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
- 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
- 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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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a method for preparing an aluminum alloy for a lithium battery soft package aluminum-plastic film, which comprises the following steps of preparing an ingot according to the following components in percentage by mass; wherein Si is 0.04-0.10%, Fe: 1.3 to 1.65 percent of Cu, less than or equal to 0.01 percent of Mn, 0.01 to 0.03 percent of Mn, and the weight ratio of Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.015 to 0.025 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent is used as ingredients, and solid aluminum ingots are used as the rest; homogenizing heat treatment of the cast ingot, namely homogenizing heat treatment of the cast ingot in the step (1); carrying out uniform hot rolling on the cast ingot, and carrying out 1+4 hot continuous rolling; cold rolling and heat treatment of the cast ingot; the method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film can ensure the strength and the elongation percentage, simultaneously has higher punching depth performance and higher surface quality, can better meet the high requirement of the aluminum-plastic film on the punching depth, can effectively reduce the content of harmful elements, reduces the possibility of plastic cracking, and further improves the comprehensive performance, and the punching depth performance of a final aluminum foil finished product can be more than 8.0 mm.
Description
Technical Field
The invention relates to the technical field of aluminum-plastic film processing production, in particular to a method for preparing an aluminum alloy for a lithium battery soft package aluminum-plastic film.
Background
The battery industry is the traditional industry with comprehensive advantages in China, China is a large country for battery production and a large country for battery consumption, in recent years, the replacement of traditional fuel vehicles by new energy vehicles has become an international consensus, and the development of new energy batteries with high efficiency, safety and low cost is fundamentally restricted. 2021-year 2025 investment analysis and prospect prediction report of the Chinese Battery industry analyzes the development analysis of industry regions, the analysis of raw material market, the analysis of application field, the management condition and the investment potential of key enterprises on the basis of introducing the development of various battery market segments, and scientifically predicts the development prospect of the battery industry. It is explicitly pointed out that: at present, the whole industry of the lithium battery is domesticated basically in China, and the lithium battery is further developed at a high speed in a quite long time in the future.
In the last decade, under the support and guidance of national policies, the whole industrial chain of lithium batteries in China is rapidly developed, the national yield of aluminum-plastic films in lithium battery materials in 2018 is only 10%, and the aluminum-plastic films are used as key materials for packaging the battery core of a flexible package lithium battery, and are links with the greatest technical difficulty and the highest barrier in the field of the current lithium battery materials. In the field of 3C at present, the drawing depth of an imported aluminum-plastic film material can reach 7-8 mm, while the drawing depth of a domestic aluminum-plastic film is only 5-6 mm; in the field of power batteries, the aluminum plastic film almost completely depends on import, and the punching depth performance can reach 8-10 mm. The deep punching performance of the aluminum-plastic film is closely related to various factors such as the matching performance of each film material, the mechanical strength, the adhesive property of an adhesive layer, the friction coefficient of the film, the ductility of an aluminum foil and the like, and the aluminum-plastic film is still the largest short plate of the domestic aluminum-plastic film at present, and the strength and the ductility of the imported or domestic aluminum-plastic film cannot be ensured, the toxicity and the cracking degree of the imported or domestic aluminum-plastic film cannot be ensured, and the quality is poor.
Disclosure of Invention
The invention aims to solve the problems, and provides a method for preparing an aluminum alloy for a lithium battery soft package aluminum-plastic film, which can ensure the strength and the elongation rate, has higher punching depth performance and higher surface quality, can ensure that the punching depth performance of a final aluminum foil finished product can be larger than 8.0mm, is far larger than the current situation that the universal punching depth performance of the current domestic aluminum-plastic film is only 5-6 mm, can better meet the high requirement of the aluminum-plastic film on the punching depth, can effectively reduce the content of harmful elements, reduces the possibility of plastic cracking, and further improves the comprehensive performance.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for preparing aluminum alloy for a lithium battery soft package aluminum-plastic film comprises the following steps: preparing an ingot casting according to the following components in percentage by mass; wherein Si is 0.04-0.10%, Fe: 1.3 to 1.65 percent of Cu, less than or equal to 0.01 percent of Mn, 0.01 to 0.03 percent of Mn, and the weight ratio of Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.015 to 0.025 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent is used as the ingredients, and solid aluminum ingots are used as the rest. And (2) homogenizing and heat treating the ingot in the step (1). And (3) carrying out uniform hot rolling on the cast ingot, and carrying out 1+4 hot continuous rolling. And (4) ingot casting cold rolling and heat treatment.
Preferably, the ingot in the step (2) is subjected to homogenization heat treatment at 580-600 ℃ for 8-10 hours.
Preferably, the step (3) is carried out by 1+4 hot continuous rolling to obtain a hot-rolled coil with the thickness of 5mm, and the final rolling temperature is 300-330 ℃.
Preferably, when the 1+4 hot continuous rolling mill is used for rolling in the step (3), the rolling reduction, the hot rough rolling pass, the thickness of the intermediate slab at the hot rough rolling outlet and the temperature of the finish rolling outlet are set according to the thickness matching of the hot rolled blank, and the thickness of the hot rolled blank is matched with the distribution of the rolling reduction in the rolling process of the slab from 612mm to 3-5mm of the finished product.
Preferably, the hot rough rolling is provided with 17-pass distribution, the thickness of each pass is 612, 593, 559, 524, 488, 451, 413, 340, 300, 269, 228, 200, 162, 131, 103, 75 and 50mm, the thickness of an intermediate slab is 50mm, the thickness of a finish rolling is 50, 33, 19, 10 and 5mm, the thickness of a flat ingot is 612mm, and the thickness of a hot rolled blank is 5 mm.
Preferably, the step (4) further comprises the steps of: (41) cold rolling: and (3) rolling the hot rolled coil in the step (2) to 0.5-0.7mm, and distributing according to specific passes. (42) recrystallization annealing: air cooling after carrying out complete recrystallization annealing at the temperature of 320-380 ℃ for 12-16 hours. (43) cold rolling: and cold-rolling the blank subjected to the complete recrystallization annealing to the thickness of 0.03-0.05 mm. (44) slitting: the coiled material is cut into the weight and the specification required by a client in a splitting machine. (45) annealing of finished products: and (3) carrying out complete recrystallization annealing on the cold-rolled alloy, wherein the annealing temperature is 260-300 ℃, and the annealing time is 4-10h, so as to obtain the aluminum foil in a use state.
Preferably, the specific pass distribution of the cold rolling in the step (41) is 5-3.5-1.8-1.0-0.5.
Preferably, the thickness of the cold-rolled blank in the step (42) is 0.5mm, the recrystallization annealing temperature is 360 ℃, and the annealing time is 16 hours.
Compared with the prior art, the invention has the following beneficial effects: firstly, the aluminum foil has higher punching depth performance and higher surface quality while ensuring the strength and the elongation, and the punching depth performance of a final aluminum foil finished product can be more than 8.0mm and is far greater than the current situation that the universal punching depth performance of the current domestic aluminum-plastic film is only 5-6 mm, so that the high requirement of the aluminum-plastic film on the punching depth can be better met; secondly, the aluminum foil disclosed by the invention can effectively reduce the content of harmful elements and improve the Fe/Si value due to the use of 3N high-purity aluminum with a higher proportion in the ingredients, and the content of alkali metal Na is less than or equal to 5ppm, the content of Li is less than or equal to 2ppm, and the content of Ca is less than or equal to 5ppm, so that the intercrystalline bonding force is improved, and the possibility of plastic cracking is reduced. Thirdly, a small amount of rare earth element Cr is added, so that the purification effect on solid solution is enhanced, and the comprehensive performance is further improved.
Detailed Description
The technical scheme of the invention is that the method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film comprises the following steps: preparing an ingot casting according to the following components in percentage by mass; wherein, Si is 0.04 to 0.10 percent, Fe: 1.3 to 1.65 percent of Cu, less than or equal to 0.01 percent of Mn, 0.01 to 0.03 percent of Mn, and the weight ratio of Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.015 to 0.025 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent is used as the ingredients, and solid aluminum ingots are used as the rest. And (2) homogenizing and heat treating the ingot in the step (1). And (3) carrying out uniform hot rolling on the cast ingot, and carrying out 1+4 hot continuous rolling. And (4) ingot casting cold rolling and heat treatment.
Specifically, the process route is as follows: ingot casting, soaking, hot rolling, cold rolling, recrystallization annealing, cold rolling, slitting and complete annealing.
The first embodiment is as follows: wherein, the ingot casting in the step (1); wherein Si is 0.04%, Fe: 1.3 percent of Cu, less than or equal to 0.01 percent of Mn, 0.01 percent of Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.015 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent and the balance of solid aluminum ingot; in the scheme of the invention, the ingot in the step (2) is subjected to homogenization heat treatment at 580 ℃ for 8-10 hours, and the ingot in the step (3) is subjected to 1+4 hot continuous rolling to form a hot rolled coil with the thickness of 5mm, wherein the final rolling temperature is 300 ℃.
When a 1+4 hot continuous rolling mill is used for rolling in the step (3), the rolling reduction, the hot rough rolling pass, the intermediate slab thickness at the hot rough rolling outlet and the finish rolling outlet temperature are set according to the hot rolling blank thickness matching, and the hot rolling blank thickness and the rolling reduction distribution are matched in the rolling process of a flat ingot from 612mm to 3-5mm of a finished product, wherein the hot rough rolling is provided with 17 pass distributions, the pass thicknesses are 612, 593, 559, 524, 488, 451, 413, 340, 300, 228, 200, 162, 131, 103, 75 and 50mm, the intermediate slab thickness is 50mm, the finish rolling thicknesses are 50, 33, 19, 10 and 5mm, the flat ingot thickness is 612mm, and the hot rolling blank thickness is 5 mm.
Further, the step (4) further comprises the following steps: (41) cold rolling: and (3) rolling the hot rolled coil in the step (2) to 0.5mm, and distributing according to specific passes. (42) recrystallization annealing: and carrying out complete recrystallization annealing at the temperature of 320 ℃ for 12-16 hours, and then air cooling. (43) cold rolling: the fully recrystallized annealed blank was cold rolled to a thickness of 0.03 mm. (44) slitting: and (4) cutting the coiled material into the weight and specification required by a client in a splitting machine. (45) annealing of finished products: and (3) carrying out complete recrystallization annealing on the cold-rolled alloy finished product, wherein the annealing temperature is 300 ℃, and the annealing time is 4h, so as to obtain the aluminum foil in a use state.
In the scheme of the invention, the specific pass distribution of the cold rolling in the step (41) is 5-3.5-1.8-1.0-0.5, the thickness of the cold rolled blank in the step (42) is 0.5mm, the recrystallization annealing temperature is 360 degrees, and the annealing time is 16 hours.
The second embodiment: the method is based on the embodiment, wherein in the step (1) ingot casting; 0.10% of Si, Fe: 1.65%, Cu not more than 0.01%, Mn 0.03%, Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.025 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent is used as ingredients, and solid aluminum ingots are used as the rest; in the scheme of the invention, the ingot in the step (2) is subjected to homogenization heat treatment at 600 ℃ for 8-10 hours, and the ingot in the step (3) is subjected to 1+4 hot continuous rolling to form a hot rolled coil with the thickness of 5mm, wherein the final rolling temperature is 330 ℃.
When a 1+4 hot continuous rolling mill is used for rolling in the step (3), the rolling reduction, the hot rough rolling pass, the intermediate slab thickness at the hot rough rolling outlet and the finish rolling outlet temperature are set according to the hot rolling blank thickness matching, and the hot rolling blank thickness and the rolling reduction distribution are matched in the rolling process of a flat ingot from 612mm to 3-5mm of a finished product, wherein the hot rough rolling is provided with 17 pass distributions, the pass thicknesses are 612, 593, 559, 524, 488, 451, 413, 340, 300, 228, 200, 162, 131, 103, 75 and 50mm, the intermediate slab thickness is 50mm, the finish rolling thicknesses are 50, 33, 19, 10 and 5mm, the flat ingot thickness is 612mm, and the hot rolling blank thickness is 5 mm.
Further, the step (4) further comprises the following steps: (41) cold rolling: and (3) rolling the hot rolled coil in the step (2) to 0.7mm, and distributing according to specific passes. (42) recrystallization annealing: air cooling after carrying out complete recrystallization annealing at the temperature of 320-380 ℃ for 12-16 hours. (43) cold rolling: the fully recrystallized annealed blank was cold rolled to a thickness of 0.05 mm. (44) slitting: the coiled material is cut into the weight and specification required by a client in a splitting machine. (45) annealing of finished products: and (3) carrying out complete recrystallization annealing on the cold-rolled alloy finished product, wherein the annealing temperature is 260 ℃, and the annealing time is 10 hours, so as to obtain the aluminum foil in the use state.
In the scheme of the invention, the specific pass distribution of the cold rolling in the step (41) is 5-3.5-1.8-1.0-0.5, the thickness of the cold-rolled blank in the step (42) is 0.5mm, the recrystallization annealing temperature is 360 degrees, and the annealing time is 16 hours; after the aluminum alloy blank is subjected to cold machining, crystal lattices can be distorted, crystal grains are damaged, crushed or elongated, relative slippage occurs among the crystal grains, a work hardening phenomenon is generated at the same time, the aim of recrystallization annealing is to basically eliminate crystallographic defects generated in the cold plastic deformation process, uniform crystal grains are formed again, and the deformation strengthening effect and residual stress are eliminated.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A method for preparing aluminum alloy for a lithium battery soft package aluminum plastic film is characterized by comprising the following steps: preparing an ingot casting according to the following components in percentage by mass; wherein Si is 0.04-0.10%, Fe: 1.3-1.65%, Cu is less than or equal to 0.01%, Mn is 0.01-0.03%, Mg: 0.001%, Cr 0.01%, Zn: 0.02 percent of Ti, 0.015 to 0.025 percent of Ti, 20 to 60 percent of high-purity aluminum with the aluminum content of more than or equal to 99.9 percent is used as ingredients, and solid aluminum ingots are used as the rest; (2) homogenizing heat treatment of the cast ingot in the step (1); (3) carrying out uniform hot rolling on the cast ingot, and carrying out 1+4 hot continuous rolling; and (4) ingot casting cold rolling and heat treatment.
2. The method for preparing the aluminum alloy for the lithium battery soft package aluminum plastic film as recited in claim 1, wherein the ingot in the step (2) is subjected to the homogenization heat treatment at 580-600 ℃ for 8-10 hours.
3. The method for preparing the aluminum alloy for the lithium battery soft package aluminum plastic film as recited in claim 1, wherein the step (3) is performed by 1+4 hot continuous rolling to form a hot rolled coil with a thickness of 5mm, and the final rolling temperature is 300 ℃ and 330 ℃.
4. The method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film as claimed in claim 3, wherein in the step (3), when a 1+4 hot continuous rolling mill is used for rolling, the rolling reduction, the hot rough rolling pass, the thickness of the intermediate slab at the hot rough rolling outlet, and the temperature of the finish rolling outlet are set according to the thickness matching of the hot rolled blank, and the thickness of the hot rolled blank and the distribution of the rolling reduction are matched in the rolling process from 612mm to 3-5mm of the finished product of the slab ingot.
5. The method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film as claimed in claim 4, wherein the hot rough rolling is provided with 17-pass distribution, the pass thickness is 612, 593, 559, 524, 488, 451, 413, 340, 300, 269, 228, 200, 162, 131, 103, 75 and 50mm, the intermediate plate blank thickness is 50mm, the finish rolling thickness is 50, 33, 19, 10 and 5mm, the slab thickness is 612mm, and the hot rolled blank thickness is 5 mm.
6. The method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film according to claim 1, wherein the step (4) further comprises the following steps: (41) cold rolling: rolling the hot rolled coil in the step (2) to 0.5-0.7mm, and distributing according to specific passes; (42) recrystallization annealing: carrying out complete recrystallization annealing at the temperature of 320-380 ℃ for 12-16 hours and then air cooling; (43) cold rolling: cold rolling the blank after complete recrystallization annealing to the thickness of 0.03-0.05 mm; (44) slitting: the coiled material is cut into the weight and the specification required by a client in a splitting machine; (45) annealing of finished products: and (3) carrying out complete recrystallization annealing on the cold-rolled alloy, wherein the annealing temperature is 260-300 ℃, and the annealing time is 4-10h, so as to obtain the aluminum foil in a use state.
7. The method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film as claimed in claim 6, wherein the specific pass distribution of the cold rolling in the step (41) is 5-3.5-1.8-1.0-0.5.
8. The method for preparing the aluminum alloy for the lithium battery soft package aluminum-plastic film as recited in claim 6, wherein the thickness of the cold rolled blank in the step (42) is 0.5mm, the recrystallization annealing temperature is 360 °, and the annealing time is 16 hours.
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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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| 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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