CN111270109A - Method for producing 8021 aluminum alloy soft packaging foil for lithium battery by cast rolling method - Google Patents
Method for producing 8021 aluminum alloy soft packaging foil for lithium battery by cast rolling method Download PDFInfo
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- CN111270109A CN111270109A CN202010242293.XA CN202010242293A CN111270109A CN 111270109 A CN111270109 A CN 111270109A CN 202010242293 A CN202010242293 A CN 202010242293A CN 111270109 A CN111270109 A CN 111270109A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—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
- C22C1/02—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
Abstract
The invention relates to a method for producing an 8021 aluminum alloy soft packaging foil for a lithium battery by a casting and rolling method, and belongs to the field of aluminum processing. The method comprises the following steps: smelting, casting and rolling a strip blank, casting and rolling coil annealing, cold rolling, intermediate annealing, foil rolling, finished product annealing, coil splitting, inspecting, packaging and warehousing; the casting and rolling strip billet is obtained by smelting an aluminum alloy melt according to the chemical components of the 8021 aluminum alloy and then casting and rolling the aluminum alloy melt into a metal strip billet; the temperature of the front box is 680-700 ℃, the liquid level height of the front box is 150-240mm, the casting and rolling speed is 0.65-0.85m/min, and the thickness of the plate blank is 5.5-7.5 mm. The 8021 alloy aluminum foil blank produced by the casting-rolling method has good metallurgical property and processing structure property, and compared with a hot rolling method, the casting-rolling method has the advantages of short production period, energy conservation and production cost reduction.
Description
Technical Field
The invention belongs to the field of aluminum material processing, and particularly relates to a method for producing an 8021 aluminum alloy soft packaging foil for a lithium battery by a casting and rolling method.
Background
The aluminum alloy soft package foil is one of the key materials of the lithium battery, and the aluminum alloy soft package foil for the 8021 battery has the characteristics of high plasticity, good corrosion resistance, good electrical conductivity and thermal conductivity, good formability, certain strength and the like, and is widely applied to the electronic industry. However, the conventional 8021 aluminum alloy soft packaging foil for the lithium battery and the manufacturing method thereof have the following problems: the existing soft packing foil for the aluminum-plastic film has low barrier property, poor cold stamping formability, and poor puncture resistance and stability, so that the adhesion and compounding performance of the existing soft packing foil for the aluminum-plastic film is poor in the compounding process of the aluminum-plastic film, and the existing soft packing foil is easy to fall off and delaminate; therefore, the 8021 aluminum alloy soft packaging foil for the lithium battery, which is resistant to folding and stamping and has good sealing performance, and the preparation method thereof are needed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for producing an 8021 aluminum alloy soft packaging foil for a lithium battery by a cast-rolling method, and the product and the process provided by the invention have the advantages of folding resistance, stamping resistance, good sealing property and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for producing an 8021 aluminum alloy soft packaging foil for a lithium battery by a cast-rolling method comprises the following elements in percentage by mass: 1.3-1.8% of Fe, less than 0.20% of Si, less than 0.1% of Cu, less than 0.1% of Mn, less than 0.05% of Mg, less than 0.05% of Cr, less than 0.05% of Zn, less than 0.05% of Ti and the balance of Al;
the method comprises the following steps:
adding aluminum ingots into a smelting furnace for smelting, adding other elements according to the proportion of the components after aluminum is leveled, stirring and smelting, and refining; continuing smelting after refining is finished; carrying out primary particle refining before pouring; introducing the aluminum liquid into a standing furnace for refining;
casting and rolling the aluminum liquid refined by the standing furnace;
and carrying out blank homogenization annealing on the cast-rolled aluminum alloy coiled material, then carrying out rolling cogging, intermediate annealing and foil rolling to obtain a finished product, carrying out complete annealing to an O state, and slitting the annealed double-layer coiled material.
Further, during the smelting process, a particle refining agent and argon are adopted to carry out degassing and deslagging on the aluminum melt.
Further, adding an aluminum ingot into a smelting furnace, smelting at 700-760 ℃, leveling aluminum after smelting for 4-6 hours, and adding other elements in proportion after leveling aluminum; stirring, smelting for 1-2 hours, refining for 2 times, continuing to smelt for 0.5-1 hour after refining is finished, and performing primary particle refining before pouring to finish the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace for refining, standing for 10-15 min after refining is completed, removing floating slag, namely finishing smelting in the standing furnace, wherein the refining frequency of the standing furnace is 4 +/-0.5 hours/time; the temperature in the furnace is 730-750 ℃ in the process of standing in-furnace smelting.
Further, online degassing and secondary filtration are simultaneously carried out in the casting and rolling process.
Further, the cast rolling comprises the following steps: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the rotating speed of the rotor is 500 +/-50 rpm, and nitrogen is introduced into a degassing box for protection; introducing the mixture into a double-stage filter box to remove impurities in the aluminum melt after online degassing and deslagging; the filtered aluminum water is guided into a front box through a flow groove, the flow groove is covered in the whole process, the temperature of the aluminum water is 680-700 ℃ when the aluminum water reaches the front box, then the aluminum water enters a casting nozzle and is formed between two reversely rotating roller rolls with cooling circulating water introduced between the two roller rolls, the size of a roll gap is 4-5.5mm, a casting area is 40-55mm, finally, an aluminum alloy plate with the thickness of 5.5-7.5 mm is formed, and then the aluminum alloy plate is coiled into a coil through equipment.
Further, the material temperature of the blank homogenizing annealing process is 480-540 ℃, and the heat preservation time is 6-10 hours.
Furthermore, the thickness of the finished product is 0.02-0.06 mm.
Furthermore, the precision of the filter plate of the first-stage filter box is 50ppi, and the precision of the filter plate of the second-stage filter box is 60 ppi.
Further, the hydrogen content of the front box is controlled to be 0.1-0.12 mL/(100g Al).
Further, the cooling water pressure is 0.5-0.6 Mpa, and the water inlet flow of the upper and lower rollers is 100-110 m3/h。
Further, the strip specification is 7.0 x (1000-: the diameter of the casting roller is 780-820mm, the convexity of the casting roller is 0.35-0.55mm, the gap of the casting roller is 4-5.5mm, and the roughness of the casting roller is 0.6-0.75 mu m; the casting and rolling process parameters are as follows: the length of the casting and rolling area is 40-55 mm.
Has the advantages that:
the invention relates to a method for producing an 8021 aluminum alloy soft packing foil for a lithium battery by a cast-rolling method, which comprises the steps of smelting an aluminum alloy containing chemical components of Fe, Si, Cu, Mn, Mg, Zn, Cr, Ti and the balance of Al, degassing and removing slag, casting and rolling aluminum water into a cast-rolled plate coil with the thickness of 5.5-7.5 mm, homogenizing annealing, cold rolling, annealing, rolling a foil to obtain a finished product, annealing and coiling to obtain the soft packing foil for the lithium battery.
The invention adopts an efficient and convenient degassing and deslagging method in the smelting, casting and rolling process, uses a particle refining agent and argon gas to carry out degassing and deslagging on an aluminum melt in the smelting process, and simultaneously carries out online degassing and secondary filtration in the casting and rolling process, thereby effectively reducing the content of hydrogen and oxidation slag inclusion in the aluminum liquid and effectively preventing the defects of the soft package aluminum foil of the 8021 lithium battery caused by the generation of holes and pinholes; the produced material for the soft package aluminum foil for the lithium battery has no defects of holes, pinholes and the like, and meets the packaging requirements of the lithium battery; the lithium battery soft bag made of the material has the advantages of good sealing performance, no leakage, safe use and the like;
in the preparation process of the 8021 lithium battery soft package aluminum foil, the control of the casting and rolling processes such as large roll diameter, large casting and rolling area, high cooling water pressure and the like is used, so that the composition segregation and the center layer segregation of a cast and rolled plate blank are effectively eliminated, the chemical composition is uniform, the grain size of the plate blank is 1 grade, and the plasticity of an aluminum foil product is improved well finally; the control of the cold rolling process can effectively eliminate the metal rolling resistance, and the rapid annealing effectively prevents the growth of crystal grains at a high temperature state, thereby comprehensively improving the crystal grain structure performance;
compared with a hot rolling production method, the material for the 8021 lithium battery soft package aluminum foil prepared by the invention has the advantages that the energy consumption is reduced by 60%, the carbon dioxide emission is reduced by 39.2%, the production period is short, and the material has good social and economic benefits and a wide application prospect.
Detailed Description
The following examples further describe embodiments of the present invention in detail. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A method for producing an 8021 soft package aluminum foil for a lithium battery by a casting and rolling method comprises the following elements in percentage by mass: 1.61% of Fe, 0.12% of Si, 0.05% of Cu, 0.05% of Mn, 0.01% of Mg, less than 0.05% of Cr, less than 0.05% of Zn, 0.042% of Ti and the balance of Al.
The preparation method of the 8021 aluminum alloy soft packaging foil for the lithium battery comprises the following steps:
(1) the smelting process comprises the following steps: a. adding an aluminum ingot into a smelting furnace, smelting at 700-760 ℃, leveling aluminum after 4-6 hours of smelting, adding a proper amount of various intermediate alloys and/or metal additives according to the proportion of the components and the charging amount after leveling aluminum, stirring, smelting for 1-2 hours, refining for 2 times, continuing to smelt for 0.5-1 hour after refining is finished, and performing primary particle refining before pouring, namely finishing the smelting operation in the smelting furnace; b. b, guiding the molten aluminum smelted in the step a into a standing furnace for refining, standing for 10-15 min after refining is finished, removing floating slag, namely finishing smelting in the standing furnace, wherein the refining frequency of the standing furnace is 4 +/-0.5 hours/time; the temperature in the furnace is 730-750 ℃ in the smelting process in the standing furnace;
(2) casting and rolling: and (3) casting and rolling the aluminum liquid refined in the step b in the step (1) in a standing furnace: the cast rolling comprises the following steps: the aluminum liquid enters an online degassing device through a standing furnace, and the rotating speed of a graphite rotor is used for online degassing450 rpm; introducing the mixture into a double-stage filter box after online degassing and deslagging, wherein the precision of a filter plate of the first-stage filter box is 50ppi, the precision of a filter plate of the second-stage filter box is 60ppi, and removing aluminum slag through bipolar filtration; the filtered molten aluminum is guided into a front box through a launder, the hydrogen content of the molten aluminum in the front box is 0.105mL/(100g Al), the temperature of the molten aluminum in the front box is 695 ℃, the molten aluminum enters a casting nozzle and is molded between two roller rollers which rotate in opposite directions and are provided with cooling circulating water in the middle, the cooling water pressure is 0.55Mpa, and the water inflow rate of upper and lower rollers is 106.5m3H, the roll gap is 5.4mm, the casting and rolling area is 55mm, the production speed is 780mm/min, and finally the aluminum alloy plate with the thickness of 7.2mm is obtained and coiled into a coil by equipment; homogenizing and annealing the cast-rolled blank: the material temperature is 520 ℃, and the heat preservation time is 6 h. The tensile strength of the finally obtained 8021 soft packing foil material is 112Mpa, the elongation reaches 19 percent, the cup crown value is 7.8mm, and the pinhole rate is 0/m2。
Example 2
A method for producing an 8021 soft-packaged aluminum foil for a lithium battery by a cast-rolling method comprises the following steps of: 1.56 percent of FeI, 0.15 percent of Si0.05 percent of Cu0.05 percent of Mn0.03 percent of Mg0.01 percent of Cr, less than 0.05 percent of Zn, 0.035 percent of Ti0.035 percent of Ti and the balance of Al; the cooling water pressure of the roller is 0.58Mpa, and the water inlet flow of the upper roller and the lower roller is 110m3H, the hydrogen content of the front box aluminum liquid is 0.11mL/(100g Al), the temperature of the front box aluminum liquid is 693 ℃, the size of a roll gap is 5.28mm, a casting and rolling area is 52mm, the production speed is 750mm/min, and the thickness of the plate blank is 7.0 mm; and (3) a cast-rolled blank homogenization annealing process: the material temperature is 500 ℃, and the heat preservation time is 8 h. The rest is the same as example 1. The tensile strength of the finally obtained 8021 soft packing foil material is 110Mpa, the elongation reaches 20 percent, the cup crown value is 8.1mm, and the pinhole rate is 0/m2。
Comparative example 1
The 8021 alloy is produced by using a conventional process, namely a hot rolling process, wherein the mass percentages of elements in the aluminum foil are as follows: 1.36 percent of Fe1, 0.35 percent of Si0, 0.10 percent of Cu0, 0.03 percent of Mn0, 0.01 percent of Mg0, less than 0.05 percent of Cr, less than 0.05 percent of Zn, 0.035 percent of Ti0, and the balance of Al; filtering and degassing the molten aluminum, casting the molten aluminum into a large slab ingot with the thickness of 250-300 mm, and performing facial washing heat treatment on the large slab ingotHot rolling into 7.0mm blank, homogenizing annealing at 450 deg.c for 12 hr, and cold rolling to form the product. The performance of the finally obtained 8021 aluminum foil finished product is that the tensile strength is 87Mpa, the elongation is 15 percent, the cup crown value is 6.5mm, and the pinhole rate is 10-12 pieces/m2。
The elongation of the embodiment is more than 18 percent, the cup convex value is more than 7mm, and the use requirement can be met; in the comparative examples, the elongation was less than 18%, the cup crown was less than 7mm, and the tensile strength and the pin hole ratio were lower than those of the examples. The component control and production process of the invention obviously improves the performance of the aluminum foil, and improves the folding resistance, stamping resistance and other properties of the soft package aluminum foil; the foil finished product has no holes or pinholes, and the aluminum plastic film for the lithium battery prepared by using the foil finished product has better sealing property, prevents the internal electrolyte from seeping out, and improves the safety of the battery; and compared with a hot rolling method, the cast rolling method has the advantages of reducing the energy consumption by 60 percent, reducing the carbon dioxide emission by 39.2 percent, having short production period, being green and environment-friendly, and having better social and economic benefits and wide application prospect.
Claims (10)
1. The method for producing the 8021 aluminum alloy soft packaging foil for the lithium battery by the cast-rolling method is characterized in that the aluminum alloy soft packaging foil is prepared from the following raw materials in percentage by mass: 1.3-1.8% of Fe, less than 0.20% of Si, less than 0.1% of Cu, less than 0.1% of Mn, less than 0.05% of Mg, less than 0.05% of Cr, less than 0.05% of Zn, less than 0.05% of Ti and the balance of Al;
the method comprises the following steps:
adding aluminum ingots into a smelting furnace for smelting, adding other elements according to the proportion of the components after aluminum is leveled, stirring and smelting, and refining; continuing smelting after refining is finished; carrying out primary particle refining before pouring; introducing the aluminum liquid into a standing furnace and refining;
casting and rolling the refined aluminum liquid in the standing furnace;
and carrying out blank homogenization annealing on the cast-rolled aluminum alloy coiled material, then carrying out rolling cogging, intermediate annealing and foil rolling to obtain a finished product, carrying out complete annealing to an O state, and slitting the annealed double-layer coiled material.
2. The method for producing the 8021 aluminum alloy soft packing foil for the lithium battery according to the claim 1, wherein the aluminum melt is degassed and deslagged by a particle refining agent and argon gas during the smelting process.
3. The method for producing an 8021 aluminum alloy soft packing foil for lithium batteries according to the casting-rolling method of claim 1,
adding aluminum ingots into a smelting furnace, smelting at 700-760 ℃, leveling aluminum after 4-6 hours of smelting, and adding other elements in proportion after leveling aluminum; stirring, smelting for 1-2 hours, refining for 2 times, continuing to smelt for 0.5-1 hour after refining is finished, and performing primary particle refining before pouring to finish the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace for refining, standing for 10-15 min after refining is completed, removing floating slag, namely finishing smelting in the standing furnace, wherein the refining frequency of the standing furnace is 4 +/-0.5 hours/time; the temperature in the furnace is 730-750 ℃ in the process of smelting in the standing furnace.
4. The method for producing the 8021 aluminum alloy soft packing foil for lithium batteries according to claim 1, wherein the on-line degassing and the secondary filtering are performed simultaneously during the casting and rolling process.
5. The method for producing the 8021 aluminum alloy soft packing foil for lithium batteries according to claim 1, wherein the cast-rolling comprises the steps of: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the rotating speed of the rotor is 500 +/-50 rpm, and nitrogen is introduced into a degassing box for protection; introducing the mixture into a double-stage filter box to remove impurities in the aluminum melt after online degassing and deslagging; the filtered aluminum water is guided into a front box through a flow groove, the flow groove is covered in the whole process, the temperature of the aluminum water reaching the front box is 680-700 ℃, then the aluminum water enters a casting nozzle and is formed between two reversely rotating roller rolls with cooling circulating water introduced into the middle, the surface roughness of the rollers is 0.6-0.75 mu m, the size of the roller gaps is 4-5.5mm, the casting area is 40-55mm, and finally an aluminum alloy plate with the thickness of 5.5-7.5 mm is formed and is coiled into a coil through equipment.
6. The method for producing the 8021 aluminum alloy soft packing foil for the lithium battery by the cast-rolling method according to claim 1, wherein the material temperature of the homogenization annealing process of the blank is 480-540 ℃, and the heat preservation time is 6-10 hours.
7. The method for producing the 8021 aluminum alloy soft packaging foil for the lithium battery by the cast-rolling method according to claim 1, wherein the thickness of a finished product is 0.02-0.06 mm.
8. The cast-rolling method for producing an 8021 aluminum alloy soft packing foil for lithium batteries as claimed in claim 1, wherein the precision of the first-stage filter plate of the filter box is 50ppi and the precision of the second-stage filter plate is 60 ppi.
9. The method for producing an 8021 aluminum alloy soft packing foil for lithium batteries according to claim 1, wherein the hydrogen content of the front box is controlled to be 0.1-0.12 mL/(100 g. about. Al).
10. The method for producing the 8021 aluminum alloy soft packaging foil for the lithium battery by the cast-rolling method according to claim 1, wherein the cooling water pressure is 0.5 to 0.6Mpa, and the water flow rate of the upper and lower rollers is 100 to 110m3/h。
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| CN115198146A (en) * | 2022-08-10 | 2022-10-18 | 洛阳万基铝加工有限公司 | Production process of aluminum foil for lithium battery flexible package |
| CN115305369A (en) * | 2022-08-19 | 2022-11-08 | 河南科技大学 | 8021 aluminum foil, preparation method thereof and 8021 aluminum alloy material |
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