CN115386702A - Material for new energy battery aluminum shell suitable for continuous die stamping and manufacturing method thereof - Google Patents
Material for new energy battery aluminum shell suitable for continuous die stamping and manufacturing method thereof Download PDFInfo
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- CN115386702A CN115386702A CN202210802097.2A CN202210802097A CN115386702A CN 115386702 A CN115386702 A CN 115386702A CN 202210802097 A CN202210802097 A CN 202210802097A CN 115386702 A CN115386702 A CN 115386702A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 title claims description 26
- 238000005097 cold rolling Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 47
- 238000005266 casting Methods 0.000 claims abstract description 44
- 238000000137 annealing Methods 0.000 claims abstract description 36
- 239000011257 shell material Substances 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims abstract description 30
- 238000009966 trimming Methods 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims description 27
- 239000000155 melt Substances 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 16
- 238000007872 degassing Methods 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000004321 preservation Methods 0.000 description 8
- 238000011056 performance test Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- 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
- 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
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
-
- 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 relates to a method for manufacturing a new energy battery aluminum shell material suitable for continuous die stamping, which comprises the following steps of smelting, casting and rolling, blank annealing and cold rolling, trimming and cleaning, pre-product annealing, secondary cold rolling and slitting to obtain the aluminum shell material, wherein the aluminum shell material comprises the following components in percentage by mass: si:0.10 to 0.3%, fe:0.40 to 0.70%, cu:0.05 to 0.20%, mn:1.00 to 1.30 percent of Mg, less than or equal to 0.05 percent of Zn, less than or equal to 0.03 percent of Ti, and the balance of Al. The scheme has the advantages of simple manufacturing method, high efficiency and high quality of the obtained finished product.
Description
Technical Field
The invention relates to the technical field of battery aluminum shell processing and production, in particular to a new energy battery aluminum shell material suitable for continuous die stamping and a manufacturing method thereof.
Background
Currently, under the support of a new energy policy of orderly coming out, the new energy battery industry enters a fast lane with 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. Aiming at the problems, the invention carries out innovative improvement.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the material for the aluminum shell of the new energy battery, which has high quality, is simple to manufacture, improves the production efficiency and reduces the cost, and is suitable for continuous die stamping, and the manufacturing method thereof.
The specific embodiments of the present invention are as follows:
the application provides a new energy battery aluminum shell material manufacturing method suitable for continuous die stamping, which is characterized by comprising the following steps:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 725-755 ℃, refining is carried out for three times and 30 min/time by using a refining agent in the smelting process, and a converter is turned over in a heat-insulating furnace, and the converter turning temperature is 720-750 ℃;
s2, casting and rolling: introducing the melt into a degassing box, filtering the melt by a filter box, passing the melt through a runner to a front box, injecting the melt into a casting roll gap through a splitter block and a casting nozzle, and casting and rolling the melt in a casting and rolling area to obtain an aluminum coil with the thickness of 10-12 mm;
s3, blank annealing and cold rolling: annealing the aluminum coil blank, cooling and cold rolling to the thickness of 1.5-3.0 mm;
s4, trimming and cleaning: performing cold rolling, and then performing trimming and cleaning, wherein the trimming amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, annealing before the finished product;
s6, secondary cold rolling: annealing before the finished product, and then carrying out secondary cold rolling by using a cold rolling mill until the thickness of the finished product is 1.0-2.0 mm;
s7, slitting: and cutting the material roll into a finished product with a small width.
Preferably: the ratio of the smelting waste in the S1 is less than or equal to 30 percent.
Preferably: s2 middle filter tank adopts board-like doublestage to filter, board-like doublestage filters including first order filter and second grade filter, the first order filter is ≧ 30 meshes, and the second grade filter is ≧ 40 meshes.
Preferably: in S2, the temperature of the degassing box is 725-732 ℃, the air flow is 21-29L/min, and the speed of the rotor is 420-460 rpm.
Preferably, the following components are used: and in the S2, the casting and rolling area is 53-56 mm, the opening degree of a casting nozzle is 10.0-11 mm, and the casting and rolling linear speed is 580-790 mm/min.
Preferably: and in the S3, the blank annealing process is carried out at the temperature of 0.8-3.0 ℃/min, the temperature is raised to 530-580 ℃, and the heat preservation time is 240-480 min.
Preferably, the following components are used: and the pre-annealing process of the S5 finished product is carried out at the temperature of between 0.8 and 3.0 ℃/min and the temperature is raised to between 360 and 420 ℃, and the heat preservation time is 120 to 360min.
Preferably: and the roughness Ra of the working roll during the S6 secondary cold rolling is less than or equal to 0.35 mu m.
Preferably: the prepared material for the aluminum shell comprises the following components in percentage by mass: si:0.10 to 0.3%, fe:0.40 to 0.70%, cu:0.05 to 0.20%, mn:1.00 to 1.30 percent of Mg, less than or equal to 0.05 percent of Zn, less than or equal to 0.03 percent of Ti, and the balance of Al.
Preferably: the mass ratio of Fe to Si is that Fe/Si is more than or equal to 2.
Compared with the prior art, the invention has the beneficial effects that:
the production method provided by the invention can be used for obtaining a new energy battery aluminum shell material product suitable for continuous die stamping, the tensile strength is 140-175 MPa, the yield strength is not less than 125MPa, the elongation is not less than 4%, the ear making rate is not less than 5%, the cup projection value is not less than 7mm, the end surface 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, pockmarks, 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 dispersion, weldability, deep punching property, thickness, trimming quality, surface quality, alloy and the like are met.
The advantageous effects of the present invention will be explained in detail in the embodiments, thereby making the advantageous effects more apparent.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly described below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data used in this way may be interchanged under appropriate circumstances, and the objects identified by "first", "second", etc. are generally in one category and do not limit the number of objects, for example, the first object may be one or more. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
The embodiments of the present application are described in detail below with reference to specific embodiments and application scenarios thereof.
Example 1
The invention relates to a method for manufacturing a new energy battery aluminum shell material suitable for continuous die stamping, which comprises the following steps of:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 725 ℃, refining three times and 30 min/time by using a special refining agent in the smelting process, generating waste materials in the smelting process, the waste material ratio is less than or equal to 30%, turning down the furnace in a heat-insulating furnace, and carrying out quenching and tempering treatment at the turning-down temperature of 720 ℃;
s2, casting and rolling: introducing the melt into a degassing tank and filtering the melt through a filter tank, wherein the temperature of the degassing tank is controlled to be 725 ℃, the air flow is controlled to be 21L/min, the speed of a rotor is controlled to be 460rpm, and the temperature of the filter tank is controlled to be 725 ℃; the filter box adopts plate type two-stage filtration, and the plate type two-stage filtration is provided with a first-stage filter plate and a second-stage filter plate, wherein the first-stage filter plate is not less than 30 meshes, and the second-stage filter plate is not less than 40 meshes; then, the aluminum is poured into a casting roll gap through a runner to a front box, the temperature of the front box is 710 ℃, the aluminum is cast and rolled through a shunting block and a casting nozzle, the casting area is controlled to be 53mm, the opening degree of the casting nozzle is controlled to be 10.0mm, and the casting and rolling linear speed is controlled to be 790mm/min, so that an aluminum coil with the thickness of 10mm is obtained;
s3, blank annealing and cold rolling: heating the aluminum coil to 530 ℃ at the speed of 0.8 ℃/min, annealing the blank under the condition of the heat preservation time of 240min, cold rolling (the pass arrangement is 11-8.2-6.0-3.9-2.6-1.5) after cooling to the thickness of 1.5mm, starting mass flow in the cold rolling process, and accurately controlling the thickness by a feedforward and feedback automatic thickness control system;
s4, trimming and cleaning: after cold rolling, adopting a drawing straightening machine to carry out edge cutting and cleaning, wherein the edge cutting amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, starting mass flow, heating to 360 ℃ at the speed of 0.8 ℃/min, and carrying out pre-product annealing under the condition of heat preservation time of 120 min;
s6, secondary cold rolling: after annealing before the finished product, performing secondary cold rolling on the working roll of the cold rolling mill until the roughness Ra is less than or equal to 0.35 mu m until the thickness of the finished product is 2.0mm, starting mass flow in the cold rolling process, wherein the pass working rate is 33.3 percent, and the secondary cold rolling can ensure that the product is in a different state and has completely different mechanical properties and can better meet the stamping requirement of a continuous die;
s7, slitting: the material roll is cut into small rolls with the width of 140 mm.
The material for the aluminum shell prepared by the method comprises the following components in percentage by mass: si:0.10, fe:0.40%, cu:0.05%, mn:1.00%, mg:0.04%, zn:0.01%, ti:0.02%, and the balance of Al, with the mass ratio of Fe to Si being Fe/Si =4.
The performance test of the aluminum product finished product for the new energy battery shows that the aluminum product has the tensile strength of 162Mpa, the yield strength of 149Mpa, the elongation of 7.2 percent, the earing rate of 3.1 percent, the cupping value of 8.6mm, neat end surface of the finished product, no obvious burrs, raised edges and wavy edges, and no defects of roll marks, pockmarks, convex dents and the like on the surface.
Example 2
The invention relates to a method for manufacturing a new energy battery aluminum shell material suitable for continuous die stamping, which comprises the following steps of:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 750 ℃, refining three times and 30 min/time by using a special refining agent in the smelting process, generating waste materials in the smelting process, the waste material ratio is less than or equal to 30%, turning down the furnace in a heat-insulating furnace, and carrying out quenching and tempering treatment at the turning-down temperature of 735 ℃;
s2, casting and rolling: introducing the melt into a degassing tank and filtering the melt through a filter tank, wherein the temperature of the degassing tank is controlled at 730 ℃, the air flow is controlled at 25L/min, the speed of a rotor is controlled at 450rpm, and the temperature of the filter tank is controlled at 725 ℃; the filter box adopts plate type two-stage filtration, and the plate type two-stage filtration is provided with a first-stage filter plate and a second-stage filter plate, wherein the first-stage filter plate is not less than 30 meshes, and the second-stage filter plate is not less than 40 meshes; then, the aluminum is poured into a casting roll gap for casting and rolling through a runner to a front box, the temperature of the front box is 710 ℃, a splitter block and a casting nozzle, the casting and rolling area is controlled to be 55mm, the opening degree of the casting nozzle is controlled to be 10.6mm, the casting and rolling linear speed is controlled to be 780mm/min, and an aluminum coil with the thickness of 11mm and the width of 1480mm is obtained;
s3, blank annealing and cold rolling: heating the aluminum coil to 550 ℃ at the speed of 1.2 ℃/min, annealing the blank under the condition of the heat preservation time of 360min, cold rolling (the pass arrangement is 11-8.2-6.0-3.9-2.6-1.5) after cooling to the thickness of 2m, starting mass flow in the cold rolling process, and accurately controlling the thickness by a feedforward and feedback automatic thickness control system;
s4, trimming and cleaning: after cold rolling, trimming and cleaning are carried out by adopting a drawing straightening machine, and the trimming amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, starting mass flow, heating to 380 ℃ at the speed of 1.2 ℃/min, and carrying out pre-product annealing under the condition of keeping the temperature for 180 min;
s6, secondary cold rolling: annealing before the finished product, performing secondary cold rolling on the work roll of the cold rolling mill until the roughness Ra is less than or equal to 0.35 mu m and the thickness of the finished product is 1.0mm, and starting mass flow in the cold rolling process, wherein the pass processing rate is 33.3%;
s7, slitting: the material roll is cut into small rolls with the width of 140 mm.
The material for the aluminum shell prepared by the method comprises the following components in percentage by mass: si:0.11, fe:0.41%, cu:0.06%, mn:1.01%, mg:0.03%, zn:0.01%, ti:0.03%, and the balance of Al, the mass ratio of Fe to Si being Fe/Si =3.73.
The performance test of the aluminum product for the new energy battery shows that the aluminum product has the advantages of 158Mpa tensile strength, 145Mpa yield strength, 7.6 percent elongation, 3.9 percent earing rate, 9mm 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.
Example 3
The invention relates to a method for manufacturing a new energy battery aluminum shell material suitable for continuous die stamping, which comprises the following steps of:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 755 ℃, refining for three times and 30 min/time by using a special refining agent in the smelting process, generating waste materials in the smelting process, the waste material ratio is less than or equal to 30 percent, turning down the furnace in a heat-insulating furnace, and carrying out quenching and tempering treatment at the turning-down temperature of 738 ℃;
s2, casting and rolling: introducing the melt into a degassing tank, and filtering the melt through a filter tank, wherein the temperature of the degassing tank is controlled at 732 ℃, the air flow is controlled at 29L/min, the speed of a rotor is controlled at 420rpm, and the temperature of the filter tank is controlled at 729 ℃; the filter box adopts plate type two-stage filtration, and the plate type two-stage filtration is provided with a first-stage filter plate and a second-stage filter plate, wherein the first-stage filter plate is not less than 30 meshes, and the second-stage filter plate is not less than 40 meshes; then the mixture is poured into a casting roll gap for casting and rolling through a runner to a front box, the temperature of the front box is 712 ℃, a splitter block and a casting nozzle, the casting area is controlled to be 56mm, the opening degree of the casting nozzle is controlled to be 10.0mm, and the casting and rolling linear speed is controlled to be 580mm/min, so that an aluminum coil with the thickness of 10.6mm and the width of 1340mm is obtained;
s3, blank annealing and cold rolling: heating the aluminum coil to 550 ℃ at a speed of 1.5 ℃/min, annealing the blank under the condition of heat preservation time of 300min, cooling, cold rolling (pass arrangement: 10.6-8.5-6.8-3.9-2.8-2.0) to the thickness of 2.5m, starting mass flow in the cold rolling process, and accurately controlling the thickness by a feedforward and feedback automatic thickness control system;
s4, trimming and cleaning: after cold rolling, trimming and cleaning are carried out by adopting a drawing straightening machine, and the trimming amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, starting mass flow, heating to 370 ℃ at the speed of 1.5 ℃/min, and carrying out pre-product annealing under the condition of heat preservation time of 240 min;
s6, secondary cold rolling: annealing before the finished product, performing secondary cold rolling on the work roll of the cold rolling mill until the roughness Ra is less than or equal to 0.35 mu m and the thickness of the finished product is 1.5mm, and starting mass flow in the cold rolling process, wherein the pass processing rate is 25%;
s7, slitting: the material roll is cut into small rolls with the width of the finished product of 210 mm.
The material for the aluminum shell prepared by the method comprises the following components in percentage by mass: si:0.28, fe:0.65%, cu:0.15%, mn:1.28%, mg:0.02%, zn:0.01%, ti:0.05%, and the balance Al, the mass ratio of Fe to Si being Fe/Si =2.32.
The performance test of the aluminum product finished product for the new energy battery shows that the aluminum product finished product has the advantages of 166Mpa tensile strength, 153Mpa yield strength, 5.8 percent elongation, 4.5 percent earing rate, 7.4mm 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.
Example 4
The invention relates to a method for manufacturing a new energy battery aluminum shell material suitable for continuous die stamping, which comprises the following steps of:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 755 ℃, refining for three times and 30 min/time by using a special refining agent in the smelting process, generating waste materials in the smelting process, the waste material ratio is less than or equal to 30 percent, turning down the furnace in a heat-insulating furnace, and carrying out quenching and tempering treatment at the turning-down temperature of 750 ℃;
s2, casting and rolling: introducing the melt into a degassing tank, and filtering the melt through a filter tank, wherein the temperature of the degassing tank is controlled at 732 ℃, the air flow is controlled at 29L/min, the rotor speed is controlled at 460rpm, and the temperature of the filter tank is controlled at 729 ℃; the filter box adopts plate type two-stage filtration, and the plate type two-stage filtration is provided with a first-stage filter plate and a second-stage filter plate, wherein the first-stage filter plate is not less than 30 meshes, and the second-stage filter plate is not less than 40 meshes; then the mixture is poured into a casting roll gap for casting and rolling through a runner to a front box, the temperature of the front box is 712 ℃, a splitter block and a casting nozzle, the casting area is controlled to be 54mm, the opening degree of the casting nozzle is controlled to be 11mm, and the casting and rolling linear speed is controlled to be 700mm/min, so that an aluminum coil with the thickness of 12mm and the width of 1340mm is obtained;
s3, blank annealing and cold rolling: heating the aluminum coil to 580 ℃ at the temperature of 3 ℃/min, annealing the blank under the condition of holding time of 480min, cold rolling (the pass arrangement is 10.6-8.5-6.8-3.9-2.8-2.0) after cooling to the thickness of 3m, starting mass flow in the cold rolling process, and accurately controlling the thickness by a feedforward and feedback automatic thickness control system;
s4, trimming and cleaning: after cold rolling, trimming and cleaning are carried out by adopting a drawing straightening machine, and the trimming amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, starting mass flow, heating to 420 ℃ at the speed of 3 ℃/min, and carrying out pre-finished product annealing under the condition of heat preservation time of 360 min;
s6, secondary cold rolling: after pre-annealing of a finished product, performing secondary cold rolling on a working roll of a cold rolling mill until the roughness Ra is less than or equal to 0.35 mu m until the thickness of the finished product is 2mm, starting mass flow in the cold rolling process, and ensuring that the pass processing rate is 25%;
s7, slitting: the material roll is cut into small rolls with the width of the finished product of 210 mm.
The material for the aluminum shell prepared by the method comprises the following components in percentage by mass: si:0.30, fe:0.70%, cu:0.20%, mn:1.30%, mg:0.05%, zn:0.03%, ti:0.05%, and the balance Al, the mass ratio of Fe to Si being Fe/Si =2.33.
The performance test of the aluminum product for the new energy battery shows that the aluminum product 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.
TABLE 1
| Tensile strength/Mpa | Yield strength/Mpa | Elongation/percent | Ear production rate/%) | Cupping value/mm | |
| Example 1 | 162 | 149 | 7.2 | 3.1 | 8.6 |
| Example 2 | 158 | 145 | 7.6 | 3.9 | 9 |
| Example 3 | 166 | 153 | 5.8 | 4.5 | 7.4 |
| Example 4 | 169 | 158 | 6.5 | 4.3 | 8 |
As can be seen from table 1, the material for aluminum cases obtained by the method of example 4 has the highest strength, and the strength and the product quality are improved by the cold rolling method while simplifying the manufacturing method.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functionality involved, e.g., the methods described may be performed in an order different than that described, and individual steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
The present application is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application.
Claims (10)
1. A manufacturing method of a new energy battery aluminum shell material suitable for continuous die stamping is characterized by comprising the following steps:
s1, smelting: fully and uniformly stirring the intermediate alloy and the aluminum ingot, then smelting to obtain a melt, wherein the smelting temperature is 725-755 ℃, refining is carried out for three times and 30 min/time by using a refining agent in the smelting process, and the converter reversing is carried out in a heat-insulating furnace, and the converter reversing temperature is 720-750 ℃;
s2, casting and rolling: introducing the melt into a degassing box, filtering the melt by a filter box, passing the melt through a runner to a front box, injecting the melt into a casting roll gap through a splitter block and a casting nozzle, and casting and rolling the melt in a casting and rolling area to obtain an aluminum coil with the thickness of 10-12 mm;
s3, blank annealing and cold rolling: annealing the aluminum coil blank, cooling and cold rolling to the thickness of 1.5-3.0 mm;
s4, trimming and cleaning: performing cold rolling, and then performing trimming and cleaning, wherein the trimming amount is 25mm x 2;
s5, annealing before finished products: after trimming and cleaning, annealing before the finished product;
s6, secondary cold rolling: annealing before the finished product, and then carrying out secondary cold rolling by using a cold rolling mill until the thickness of the finished product is 1.0-2.0 mm;
s7, slitting: and cutting the material roll into a finished product with a small width.
2. The method for manufacturing the material for the aluminum shell of the new energy battery suitable for the continuous die stamping as claimed in claim 1, wherein the ratio of the scrap smelted in S1 is less than or equal to 30%.
3. The manufacturing method of the new energy battery aluminum shell material suitable for continuous die stamping according to claim 1 or 2, characterized in that the filter box in S2 adopts plate type double-stage filtration, the plate type double-stage filtration comprises a first-stage filter plate and a second-stage filter plate, the first-stage filter plate is not smaller than 30 meshes, and the second-stage filter plate is not smaller than 40 meshes.
4. The manufacturing method of the material for the aluminum shell of the new energy battery suitable for continuous die stamping as claimed in claim 3, wherein the temperature of the degassing tank in S2 is 725-732 ℃, the air flow rate is 21-29L/min, and the rotor speed is 420-460 rpm.
5. The manufacturing method of the new energy battery aluminum shell material suitable for the continuous die stamping as claimed in claim 4, wherein the casting area in S2 is 53-56 mm, the opening degree of the casting nozzle is 10.0-11 mm, and the casting and rolling line speed is 580-790 mm/min.
6. The method for manufacturing the material for the aluminum shell of the new energy battery suitable for the continuous die stamping as claimed in claim 5, wherein the annealing process of the blank in S3 is 0.8 ℃/min to 3.0 ℃/min to 530 ℃ to 580 ℃, and the holding time is 240min to 480min.
7. The method for manufacturing the material for the aluminum shell of the new energy battery suitable for continuous die stamping as claimed in claim 6, wherein the pre-annealing process of the S5 finished product is 0.8-3.0 ℃/min to 360-420 ℃, and the holding time is 120-360 min.
8. The method for manufacturing the material for the aluminum shell of the new energy battery suitable for the continuous die stamping as claimed in claim 7, wherein the roughness of the working roll in the S6 secondary cold rolling is Ra ≤ 0.35 μm.
9. The manufacturing method of the material for the aluminum shell of the new energy battery suitable for the continuous die stamping as claimed in claim 8, wherein the manufactured material for the aluminum shell comprises the following components in percentage by mass: si:0.10 to 0.3%, fe:0.40 to 0.70%, cu:0.05 to 0.20%, mn:1.00 to 1.30 percent of Mg, less than or equal to 0.05 percent of Zn, less than or equal to 0.03 percent of Ti, and the balance of Al.
10. The manufacturing method of the material for the aluminum shell of the new energy battery suitable for the continuous die stamping as claimed in claim 9, wherein the mass ratio of Fe to Si is Fe/Si ≥ 2.
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| CN114525432A (en) * | 2022-01-08 | 2022-05-24 | 浙江佑丰新材料股份有限公司 | High-strength and high-extension aluminum foil for new energy battery and manufacturing method thereof |
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