CN115216669A - Material for new energy battery aluminum shell for continuous die stamping and manufacturing method thereof - Google Patents
Material for new energy battery aluminum shell for continuous die stamping and manufacturing method thereof Download PDFInfo
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- CN115216669A CN115216669A CN202210806952.7A CN202210806952A CN115216669A CN 115216669 A CN115216669 A CN 115216669A CN 202210806952 A CN202210806952 A CN 202210806952A CN 115216669 A CN115216669 A CN 115216669A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 42
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 title claims description 26
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 238000005097 cold rolling Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 238000009966 trimming Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 230000000750 progressive effect Effects 0.000 claims 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 239000011257 shell material Substances 0.000 abstract description 15
- 238000004321 preservation Methods 0.000 abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a new energy battery aluminum shell material for continuous die stamping and a manufacturing method thereof, and the new energy battery aluminum shell material comprises the following components in percentage by mass: 0.10 to 0.3 percent of Si, 0.40 to 0.70 percent of Fe, 0.05 to 0.20 percent of Cu, 1.00 to 1.30 percent of Mn, less than or equal to 0.05 percent of Mg, less than or equal to 0.03 percent of Zn, less than or equal to 0.05 percent of Ti, and the balance of Al. The process flow comprises the steps of smelting, casting and rolling, blank annealing, cold rolling, trimming and cleaning, pre-finished product annealing, secondary cold rolling and slitting, wherein the smelting temperature is in the range of 725-755 ℃, the molten product is smelted and is poured into a standing furnace for standing and heat preservation at the temperature of 720-750 ℃ after melt refining treatment; then cast-rolling the aluminum alloy into a cast-rolling aluminum coil with the thickness of 11 +/-1 mm, and directly annealing the blank of the cast-rolling aluminum coil; after cooling, cold rolling to 1.5-3.0 mm, trimming and cleaning; annealing before finished products are obtained; then cold rolling is carried out to the thickness of the finished product of 1.0-2.0 mm; and then slitting is carried out until the width of the finished product is reached. The product has the characteristics of high strength, high elongation, low earing rate, high cupping value, and good plate type and surface end surface quality, and meets the index requirements of the aluminum shell of the new energy battery.
Description
Technical Field
The invention relates to a material for a new energy battery aluminum shell for continuous die stamping and a manufacturing method thereof, and relates to the technical field of non-ferrous metal smelting, casting and rolling, heat treatment and rolling manufacturing.
Background
Currently, under the support of new energy policy of national order and under the thrust of "carbon peak, carbon neutralization" policy, the new energy battery industry enters the express way of high-speed development. The battery aluminum shell is used as an important component of a new energy automobile battery, the deformation amount in the punching process is large, the punching passes are multiple, the production process is complex, the requirement on the comprehensive performance of the material is high, the material is required to have small thickness deviation and good surface quality, and meanwhile, the material is required to have good plasticity, small yield ratio, low earing rate and the like so as to ensure the safety and reliability of the battery in the use process. In the past, steel shells or nickel-plated steel shells (such as cylindrical batteries) are mostly adopted in the industry, and the steel shells have the defects of high density, poor electromagnetic interference resistance, poor recoverability, poor reproducibility and the like. In recent years, aluminum and aluminum alloy enterprises at home and abroad successfully develop the aluminum plate for the battery case to be applied to the new energy square battery aluminum case by adopting a hot rolling process, but the hot rolling process has the defects of large equipment investment, long production flow, high energy consumption, low yield and the like.
Disclosure of Invention
The invention provides a material for a new energy battery aluminum shell for continuous die stamping and a manufacturing method thereof, which can meet the requirements of the new energy battery aluminum shell on indexes such as high-temperature creep property, corrosion resistance, heat dissipation performance, weldability, deep drawing performance, thickness, trimming quality, surface quality, alloy and the like.
In order to solve the technical problem, the invention aims to realize that: the invention relates to a material for a new energy battery aluminum shell for continuous die stamping, which comprises the following components in percentage by mass: 0.10 to 0.3 percent of Si, 0.40 to 0.70 percent of Fe, 0.05 to 0.20 percent of Cu, 1.00 to 1.30 percent of Mn, less than or equal to 0.05 percent of Mg, less than or equal to 0.03 percent of Zn, less than or equal to 0.05 percent of Ti, and the balance of Al.
The invention also provides a rolling control method under the alloy component system based on the technical scheme of the alloy components, which comprises the following steps:
(1) Smelting: the raw materials are fully and uniformly stirred during smelting, the smelting temperature is 725-755 ℃, the converter-reversing temperature is 720-750 ℃, and the Fe/Si is required to be not less than 2;
(2) Casting and rolling: the thickness of the finished cast-rolled aluminum coil is 11 +/-1 mm;
(3) Blank annealing and cold rolling: annealing the cast-rolling aluminum coil blank, cooling and cold-rolling to 1.5-3.0 mm;
(4) Trimming and cleaning: trimming and cleaning are carried out after cold rolling;
(5) Annealing before finished products: after trimming and cleaning, annealing before the finished product;
(6) Secondary cold rolling: annealing before the finished product, and then performing secondary cold rolling to the thickness of the finished product of 1.0-2.0 mm:
(7) Slitting: and cutting the finished thick material roll into a finished wide small roll.
The invention is further configured to: in the step (1), the ratio of smelting waste materials is controlled to be less than or equal to 30 percent.
The invention is further configured to: and (2) quenching and tempering the heat preservation furnace in the step (1).
The invention is further configured to: and (3) filtering the filter box in the step (2) by adopting a plate type double-stage filter, wherein a first-stage filter plate is not smaller than 30 meshes, and a second-stage filter plate is not smaller than 40 meshes.
The invention is further configured to: in the step (3), the blank annealing process is carried out at the temperature of between 0.8 and 3.0 ℃/min, the temperature is raised to between 530 and 580 ℃, the heat preservation time is 240 to 480min, and the blank is taken out of the furnace and cooled.
The invention is further configured to: and (3) in the rolling process of the steps (3) and (6), the mass flow is required to be started, the thickness difference of 1.0-2.0 mm is required to be less than or equal to +/-1%, and the good rate of the thickness difference of the whole coil is greater than or equal to 95%.
The invention is further configured to: in the step (5), the blank annealing process is carried out at the temperature of 0.8-3.0 ℃/min, the temperature is raised to 360-420 ℃, the heat preservation time is 120-360 min, and the blank is taken out of the furnace and cooled.
The invention is further configured to: and (6) controlling the roughness of the working roll in the secondary cold rolling in the step (6) to be Ra: less than or equal to 0.35 mu m.
In conclusion, the invention has the following beneficial effects: the tensile strength of the material product for the new energy battery aluminum shell for continuous die stamping is 140-175 MPa, the yield strength is not less than 125MPa, the elongation is not less than 4%, the lug making rate is not less than 5%, the cup protrusion value is not less than 7mm, the end face of a finished product is neat, the phenomena of obvious burrs, raised edges and wavy edges are avoided, the surface has no defects such as roll marks, pits, convex dents and the like, and the requirements of the new energy battery aluminum shell on indexes such as high-temperature creep property, corrosion resistance, heat dissipation performance, weldability, deep drawing performance, thickness, trimming quality, surface quality, alloy and the like are met.
Detailed Description
For a better understanding of the technical solutions of the present invention, the following preferred embodiments of the present invention are described in conjunction with the specific examples, but it should be understood that the descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the patent claims of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be further illustrated with reference to preferred embodiments.
Example 1
The invention relates to a material for a new energy battery aluminum shell for continuous die stamping and a manufacturing method thereof, and the material comprises the following components by mass percent: 0.11% of Si, 0.41% of Fe0, 0.06% of Cu0, 1.01% of Mn1, 0.03% of Mg0, 0.01% of Zn0.03% of Ti0.03% of Al, and the balance of Fe/Si =3.73.
According to the component control, the aluminum shell material for the new energy battery is further obtained, and the preparation method comprises the following specific steps:
(1) Smelting: when in smelting, the raw materials are fully and uniformly stirred, the smelting temperature is 750 ℃, a special refining agent is adopted in a smelting furnace for refining for three times and 30 min/time at 750 ℃, the converter is turned over after the component adjustment meets the control requirement of the invention, and the converter turning temperature is 735 ℃;
(2) Casting and rolling: during casting and rolling production, the temperature of a degassing box is controlled at 730 ℃, the air flow is controlled at 25L/min, the speed of a rotor is controlled at 450rpm, the temperature of a filter box is controlled at 725 ℃, a 30+ 40-mesh filter plate is used for double-stage filtration, the temperature of a front box is 710 ℃, a casting and rolling area is controlled at 55mm, the opening degree of a casting nozzle is controlled at 10.6mm, the casting and rolling line speed is controlled at 780mm/min, and the specification of a cast and rolled aluminum coil finished product is 11mm in thickness and 1480mm in width;
(3) Blank annealing and cold rolling: annealing the cast-rolled aluminum coil at 580 ℃ for 6h, cooling, cold rolling (pass arrangement: 11-8.2-6.0-3.9-2.6-1.5), and starting mass flow in the rolling process;
(4) Trimming and cleaning: performing trimming and cleaning after cold rolling, and performing online trimming and cleaning by adopting a drawing straightening machine, wherein the trimming amount is 25mm x 2;
(5) Annealing before finished products: annealing the finished product for 3 hours at the temperature of 420 ℃ before trimming and cleaning;
(6) Secondary cold rolling: annealing and then performing secondary cold rolling on the finished product until the thickness of the finished product is 1.0mm, starting mass flow in the rolling process, and ensuring the pass processing rate to be 33.3%;
(7) Slitting: and cutting the thick material with the loop to 140mm after secondary cold rolling.
The performance test of the aluminum foil finished product for the new energy battery shows that the aluminum foil finished product for the new energy battery has the advantages of 158Mpa tensile strength, 145Mpa yield strength, 7.6 percent elongation, 3.9 percent earing rate, 9mm cupping value, neat end face of the finished product, no obvious burr, raised edge and wavy edge phenomena, no roller marks, pockmarks, raised pits and other defects on the surface.
Example 2
The invention relates to a material for a new energy battery aluminum shell for continuous die stamping and a manufacturing method thereof, and the material comprises the following components by mass percent: 0.28% of Si, 0.65% of Fe0, 0.15% of Cu0, 1.28% of Mn1, 0.02% of Mg0, 0.01% of Zn0.05% of Ti0, and the balance of Al, wherein Fe/Si =2.32.
According to the component control, the aluminum shell material for the new energy battery is further obtained, and the preparation steps are as follows:
(1) Smelting: when in smelting, the raw materials are fully and uniformly stirred, the smelting temperature is 755 ℃, the raw materials are refined by a special refining agent at 755 ℃ for three times and 30 min/time in a smelting furnace, and the furnace is turned over after the component adjustment meets the control requirement of the invention, and the furnace turning-over temperature is 738 ℃;
(2) Casting and rolling: during casting and rolling production, the temperature of a degassing box is controlled at 732 ℃, the airflow is controlled at 29L/min, the rotor speed is controlled at 420rpm, the temperature of a filter box is controlled at 729 ℃, a 30+ 40-mesh filter plate is used for double-stage filtration, the temperature of a front box is 712 ℃, a casting and rolling area is controlled at 56mm, the opening degree of a casting nozzle is controlled at 10.0mm, the casting and rolling line speed is controlled at 580mm/min, and the specification of a cast and rolled aluminum coil finished product is 10.6mm in thickness and 1340mm in width;
(3) Blank annealing and cold rolling: annealing the cast-rolled aluminum coil at 550 ℃, preserving heat for 5h, cooling, cold rolling (pass arrangement: 10.6-8.5-6.8-3.9-2.8-2.0), and starting mass flow in the rolling process;
(4) Trimming and cleaning: performing edge cutting and cleaning after cold rolling, and performing online edge cutting and cleaning by adopting a drawing straightening machine, wherein the edge cutting amount is 25mm x 2;
(5) Annealing before finished products: after trimming and cleaning, annealing the finished product at 370 ℃ for 4h;
(6) Secondary cold rolling: annealing and then performing secondary cold rolling on the finished product until the thickness of the finished product is 1.5mm, starting mass flow in the rolling process, and ensuring that the pass processing rate is 25%;
(7) Slitting: and cutting the thick material with the loop to 210mm after secondary cold rolling.
The performance test of the aluminum foil finished product for the new energy battery shows that the aluminum foil finished product for the new energy battery has the advantages of 169Mpa tensile strength, 158Mpa yield strength, 6.5 percent elongation, 4.3 percent earing rate, 8mm cupping value, neat end surface of the finished product, no obvious burr, raised edge and wavy edge phenomena, no roller marks, pockmarks, raised pits and other defects on the surface.
Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the actual shown orientation or positional relationship, it is only for convenience of describing the present invention and simplifying the description, but it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, the terms describing the orientation or positional relationship in the present invention are only used for exemplary illustration and are not to be construed as limiting the patent, and it is possible for a person having ordinary skill in the art to combine the embodiments and understand the specific meaning of the above terms according to the specific situation.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (9)
1. The material for the new energy battery aluminum shell for continuous die stamping is characterized by comprising the following components in percentage by mass: 0.10 to 0.3 percent of Si, 0.40 to 0.70 percent of Fe, 0.05 to 0.20 percent of Cu, 1.00 to 1.30 percent of Mn, less than or equal to 0.05 percent of Mg, less than or equal to 0.03 percent of Zn, less than or equal to 0.05 percent of Ti, and the balance of Al.
2. The material for the aluminum case of the new energy battery for the progressive die stamping and the manufacturing method thereof according to claim 1, wherein the steps of the method are as follows:
(1) Smelting: the raw materials are fully and uniformly stirred during smelting, the smelting temperature is 725-755 ℃, the converter reversing temperature is 720-750 ℃, and the Fe/Si requirement is not less than 2;
(2) Casting and rolling: the thickness of the finished cast-rolled aluminum coil is 11 +/-1 mm;
(3) Blank annealing and cold rolling: annealing the cast-rolled aluminum coil blank, cooling, and cold-rolling to 1.5-3.0 mm;
(4) Trimming and cleaning: trimming and cleaning are carried out after cold rolling;
(5) Annealing before a finished product: after trimming and cleaning, annealing before the finished product;
(6) Secondary cold rolling: annealing before the finished product, and then performing secondary cold rolling to the thickness of the finished product of 1.0-2.0 mm:
(7) Slitting: and cutting the finished thick material roll into a finished wide small roll.
3. The material for the aluminum can of the new energy battery for continuous die stamping and the manufacturing method thereof as claimed in claim 2, wherein the ratio of the melting scrap in the step (1) is controlled to be 30% or less.
4. The material for the new energy battery aluminum case for the continuous die stamping as recited in claim 2, wherein the holding furnace is subjected to thermal refining in step (1).
5. The material for a new energy battery aluminum case for continuous die stamping and the manufacturing method thereof according to claim 2, wherein the filter box in step (2) is a plate type two-stage filter, the first stage filter size is 30 mesh or larger, and the second stage filter size is 40 mesh or larger.
6. The material for the aluminum shell of the new energy battery for the continuous die stamping as well as the manufacturing method thereof according to claim 2 are characterized in that the blank annealing process in the step (3) is 0.8-3.0 ℃/min to 530-580 ℃, the holding time is 240-480 min, and the blank is taken out of the furnace and cooled.
7. The material for the new energy battery aluminum case for the continuous die stamping as claimed in claim 2, and the manufacturing method thereof, characterized in that the mass flow is required to be opened in the rolling process in the steps (3) and (6), the thickness difference of 1.0-2.0 mm is required to be less than or equal to +/-1%, and the intact thickness difference of the whole roll is greater than or equal to 95%.
8. The material for the aluminum shell of the new energy battery for the continuous die stamping as claimed in claim 2, and the manufacturing method thereof, wherein the blank annealing process in the step (5) is 0.8 ℃/min to 3.0 ℃/min to raise the temperature to 360-420 ℃, the holding time is 120-360 min, and the blank is discharged and cooled.
9. The material for the aluminum case of the new energy battery for the progressive die stamping and the manufacturing method thereof according to claim 2, wherein the roughness of the work roll at the time of the secondary cold rolling in step (6) is controlled to be Ra: less than or equal to 0.35 mu m.
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Application publication date: 20221021 |