CN114752821A - Aluminum alloy strip for power battery shell and preparation method thereof - Google Patents
Aluminum alloy strip for power battery shell and preparation method thereof Download PDFInfo
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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
- 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
- C21D8/0226—Hot rolling
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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
- 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
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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
- 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
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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Abstract
The invention discloses an aluminum alloy strip for a power battery shell, which comprises the following components in percentage by mass: si: 0.07 to 0.18 wt%, Fe: 0.35 to 0.70 wt%, Cu: 0.05 to 0.20 wt%, Mn: 1.0 to l.5wt%, Sn: 0.015 to 0.2 wt%, Bi: 0.015 to 0.2 wt%, Mg: less than or equal to 0.02 wt%, Zn: less than or equal to 0.03 wt%, Ti: 0.03 to 0.05 wt%, Zr: not more than 0.05 wt%, Fe/Si 2-4 wt%, and the balance of Al and inevitable impurities. The method for preparing the aluminum alloy strip for the power battery shell comprises the following steps: casting an ingot; homogenizing; milling; hot rolling; cold rolling; intermediate annealing; and (6) rolling a finished product. The invention solves the die sticking phenomenon in the punching process, prolongs the service life of the die, and is economical and easy to popularize.
Description
The application is a divisional application of an invention patent with application date of 09 and 03 in 2019, application number of 201910825885.1 and invention name of aluminum alloy strip for power battery shell and a preparation method thereof.
Technical Field
The invention belongs to the field of preparation of aluminum alloy strips, and particularly relates to an aluminum alloy strip for a power battery shell and a preparation method thereof.
Background
The power battery is used as a main energy storage element of the new energy automobile, and directly determines the service performance of the electric automobile. The power battery shell is used as an important component of the power battery and directly determines the service performance of the power battery.
Since an Al — Mn-based 3000-type alloy is relatively excellent in strength, formability, and laser weldability, it is used as a material for producing a secondary battery container such as a new energy power lithium ion battery. The molded product was reshaped into a desired shape and sealed by laser welding to be used as a secondary battery container.
The new energy power battery shell has the advantages of large deformation in the punching process, multiple punching passes and complex production process, puts high requirements on the comprehensive performance, particularly the deep punching performance of the material, requires the material to have small thickness deviation and good surface quality, and also requires good plasticity, small yield ratio and low earing rate to ensure the safety of the battery in the service process. At present, the material has the defects of poor deep drawing performance, high lug making rate, die sticking, large heat productivity, relatively poor friction resistance and the like.
Disclosure of Invention
The invention aims to provide an aluminum alloy strip for a power battery shell and a preparation method thereof, aiming at the defects of poor deep drawing performance, high earing rate, easy die sticking of aluminum materials and the like of the conventional material. The aluminum alloy strip prepared by the invention can meet good deep drawing performance, is not easy to adhere to a die, and is an economical and easily popularized preparation method.
In order to realize the technical purpose, the following technical scheme is adopted:
an aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.07 to 0.18 wt%, Fe: 0.35-0.70 wt%, Cu: 0.05 to 0.20 wt%, Mn: 1.0 to l.5wt%, Sn: 0.015 to 0.2 wt%, Bi: 0.015 to 0.2 wt%, Mg: less than or equal to 0.02 wt%, Zn: less than or equal to 0.03 wt%, Ti: 0.03 to 0.05 wt%, Zr: not more than 0.05 wt%, Fe/Si 2-4 wt%, and the balance of Al and inevitable impurity elements.
Further, the mass percent of the Fe is 0.55-0.65%.
Further, the mass percent of Cu is 0.05-0.10%.
Further, the mass percent of Mn is 1.0-1.1%.
Further, the mass percent of Sn is 0.015-0.04%.
Further, the mass percentage of Bi is 0.015-0.04%.
Further, the mass percent of Ti is 0.03-0.05%.
Further, the mass percentage of the impurity element is less than 0.05%.
The invention also provides a preparation method of the aluminum alloy strip for the power battery shell, which comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into an aluminum alloy slab ingot;
(2) Homogenization: sawing the flat ingot, heating at 580-600 ℃, carrying out homogenization heat treatment for more than 8 hours of heat preservation, discharging from a furnace, and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 485-505 ℃, the hot rolling is carried out until the thickness is 7.5 +/-0.2 mm, and the final hot rolling temperature is 320-360 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.0 +/-0.5 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature to be 360-370 ℃, and cooling to room temperature after discharging;
(7) rolling a finished product: and (3) rolling the strip processed in the step (6) to be 1.5(0, +0.05) mm in thickness through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 20-30%, thereby finally preparing the aluminum alloy strip for the power battery shell. The cold rolling reduction rate is preferably 25 to 30%.
The aluminum alloy strip prepared by the method has the tensile strength of l 46-150 MPa, the elongation of more than 10% and the earing rate of less than 2.5%.
According to the invention, through the optimization design, homogenization treatment and final performance optimization of chemical components, the anisotropy of the material and the lug making rate during deep drawing are reduced, the die sticking phenomenon in the drawing process is solved, and the heat generation of the die is reduced, so that the service life of the die is prolonged. The aluminum alloy strip has the advantages of good deep drawing, difficulty in die sticking and excellent welding, realizes excellent matching of material strength, plasticity and deep drawing performance, and is an economical and easily-popularized preparation method.
Detailed Description
The present invention is further described in detail with reference to the following examples, which are intended to illustrate the present invention and not to limit the present invention.
Example 1
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.2 wt%, Fe: 0.55 wt%, Cu: 0.05 wt%, Mn: 1.0 wt%, Sn: 0.01 wt%, Bi: 0.01 wt%, Mg: 0.02 wt%, Zn: 0.03 wt%, Ti: 0.03 wt%, Zr: 0.05 wt%, Fe/Si 2.75%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, an aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 590 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 485 ℃, the hot rolling thickness is 7.5mm, and the final hot rolling temperature is 325 ℃;
(5) Cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.05 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 360 ℃, and cooling to room temperature after discharging;
(7) rolling a finished product: and (5) rolling the strip processed in the step (6) to the thickness of 1.52mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 25.9%, thereby finally preparing the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 148MPa, the elongation is 10%, and the earing rate is 2.5%.
Example 2
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.23 wt%, Fe: 0.6 wt%, Cu: 0.10 wt%, Mn: 1.3 wt%, Sn: 0.03 wt%, Bi: 0.03 wt%, Mg: 0.02 wt%, Zn: 0.03 wt%, Ti: 0.04 wt%, Zr: 0.05 wt%, Fe/Si 2.4%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) Homogenization: sawing the flat ingot, heating at 600 ℃, carrying out homogenization heat treatment for more than 8 hours, discharging from a furnace, and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 500 ℃, the hot rolling thickness is 7.6mm, and the final hot rolling temperature is 340 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.07 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 370 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.54mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 25.6 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 147MPa, the elongation is 13%, and the earing rate is 2.4%.
Example 3
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.25 wt%, Fe: 0.7 wt%, Cu: 0.2 wt%, Mn: 1.5 wt%, Sn: 0.05 wt%, Bi: 0.05 wt%, Mg: 0.02 wt%, Zn: 0.03 wt%, Ti: 0.05 wt%, Zr: 0.05 wt%, Fe/Si 2.8%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining, online deslagging and degassing, an aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenization: sawing the flat ingot, heating at 595 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging from a furnace and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the starting rolling temperature is 504 ℃, the hot rolling is carried out until the thickness is 7.6mm, and the final rolling temperature of the hot rolling is 345 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.03 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 365 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.51mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 25.6 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 149MPa, the elongation is 12 percent, and the earing rate is 2.2 percent.
Example 4
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.15 wt%, Fe: 0.55 wt%, Cu: 0.07 wt%, Mn: 1.1 wt%, Sn: 0.05 wt%, Bi: 0.015 wt%, Mg: 0.01 wt%, Zn: 0.015 wt%, Ti: 0.01 wt%, Zr: 0.03 wt%, Fe/Si 3.7%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 580 ℃ and carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 490 ℃, the hot rolling thickness is 7.7mm, and the final hot rolling temperature is 323 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.02 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 360 ℃, and cooling to room temperature after discharging;
(7) Rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.53mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 24.3 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 146MPa, the elongation is 14%, and the earing rate is 2.4%.
Example 5
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.22 wt%, Fe: 0.57 wt%, Cu: 0.09 wt%, Mn: 1.3 wt%, Sn: 0.015 wt%, Bi: 0.015 wt%, Mg: 0.015 wt%, Zn: 0.025 wt%, Ti: 0.01 wt%, Zr: 0.025 wt%, Fe/Si 2.6%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 580 ℃ and carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) Hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 505 ℃, the hot rolling thickness is 7.3mm, and the final hot rolling temperature is 350 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.05 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 363 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.52mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 25.9 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 151MPa, the elongation is 12%, and the earing rate is 2.3%.
Example 6
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.18 wt%, Fe: 0.65 wt%, Cu: 0.15 wt%, Mn: 1.5 wt%, Sn: 0.035 wt%, Bi: 0.025 wt%, Mg: 0.02 wt%, Zn: 0.007 wt%, Ti: 0.03 wt%, Zr: 0.015 wt%, Fe/Si 3.6%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) Homogenization: sawing the flat ingot, heating at 590 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 500 ℃, the hot rolling is carried out until the thickness is 7.5mm, and the final hot rolling temperature is 342 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.08 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 370 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.51mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 27.4 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 153MPa, the elongation is 11%, and the earing rate is 2.2%.
Example 7
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.2 wt%, Fe: 0.7 wt%, Cu: 0.18 wt%, Mn: 1 wt%, Sn: 0.2 wt%, Bi: 0.05 wt%, Mg: 0.01 wt%, Zn: 0.012 wt%, Ti: 0.05 wt%, Zr: 0.045 wt%, Fe/Si ═ 3.5%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining, online deslagging and degassing, an aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenization: sawing the flat ingot, heating at 600 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the cast ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 495 ℃, the hot rolling is carried out until the thickness is 7.4mm, and the hot rolling finishing temperature is 335 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.03 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 368 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.55mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 23.6 percent to finally prepare the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 146MPa, the elongation is 14%, and the earing rate is 2.2%.
Example 8
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.14 wt%, Fe: 0.55 wt%, Cu: 0.2 wt%, Mn: 1.4 wt%, Sn: 0.05 wt%, Bi: 0.2 wt%, Mg: 0.01 wt%, Zn: 0.005 wt%, Ti: 0.025 wt%, Zr: 0.005 wt%, Fe/Si 3.9%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 580 ℃ and carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 500 ℃, the hot rolling is carried out until the thickness is 7.5mm, and the hot rolling finishing temperature is 348 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.02 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 365 ℃, discharging and cooling to room temperature;
(7) Rolling a finished product: and (5) rolling the strip processed in the step (6) to the thickness of 1.5mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 25.7%, thereby finally preparing the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 149MPa, the elongation is 13%, and the earing rate is 2.3%.
Example 9
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.18 wt%, Fe: 0.57 wt%, Cu: 0.13 wt%, Mn: 1.05 wt%, Sn: 0.04 wt%, Bi: 0.03 wt%, Mg: 0.005 wt%, Zn: 0.01 wt%, Ti: 0.045 wt%, Zr: 0.01 wt%, Fe/Si 3.2%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 585 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) Hot rolling: discharging the cast ingot obtained in the step (3) for hot rolling, wherein the initial rolling temperature is 485 ℃, the hot rolling thickness is 7.7mm, and the hot rolling final rolling temperature is 322 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.07 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 362 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.53mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 26.1%, thereby finally preparing the aluminum alloy strip for the power battery shell.
The tensile strength of the prepared aluminum alloy strip is 150MPa, the elongation is 13%, and the earing rate is 2.3%.
Comparative example 1
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.06 wt%, Fe: 0.7 wt%, Cu: 0.04 wt%, Mn: 0.8 wt%, Sn: 0.008 wt%, Bi: 0.007 wt%, Mg: 0.05 wt%, Zn: 0.025 wt%, Ti: 0.08 wt%, Zr: 0.035 wt%, Fe/Si 11.7 wt%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) Homogenization: sawing the flat ingot, heating at 570 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 470 ℃, the hot rolling thickness is 6mm, and the hot rolling final rolling temperature is 310 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 1.6 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 340 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.3mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 18.8%, thereby finally preparing the aluminum alloy strip for the power battery shell. The finished product was analyzed after sawing and the properties are shown in table 1.
Table 1 results of performance tests on the aluminum alloy strip obtained in comparative example 1
| Tensile strength/Rm | Elongation/percent | Ear production rate/%) |
| 128 | 13 | 4 |
As seen from Table 1, according to this technical proposal, since the Si content is low, the strength of the aluminum alloy sheet is lowered and the fluidity of the liquid is lowered; the strength of the aluminum alloy plate is reduced due to the low content of Cu and Mn; because the content of Sn and Bi is reduced, the improvement effect of the comprehensive properties such as gluing resistance, wear resistance, friction reduction, corrosion resistance, cutting performance and the like is not obvious; because the Ti content is high, the refining effect is not obvious, and the production cost is increased; because the Fe/Si is high, the homogenization temperature is low, the hot rolling initial rolling temperature is low, and the finishing rolling temperature is low, so that the earing rate is high; because the cold rolling processing rate is low, the tensile strength of the aluminum material is low, and the aluminum material is easy to stick a die during punching; due to the low annealing temperature, the earing rate is high.
Comparative example 2
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.3 wt%, Fe: 0.55 wt%, Cu: 0.15 wt%, Mn: 1.8 wt%, Sn: 0.35 wt%, Bi: 0.08 wt%, Mg: 0.015 wt%, Zn: 0.01 wt%, Ti: 0.035 wt%, Zr: 0.007 wt%, Fe/Si ═ 1.8%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 600 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 520 ℃, the thickness is 9mm, and the final hot rolling temperature is 370 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.5 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 360 ℃, and cooling to room temperature after discharging;
(7) Rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.7mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 43.3 percent to finally prepare the aluminum alloy strip for the power battery shell. The finished product was analyzed after sawing and the properties are shown in table 2.
Table 2 results of performance tests on the aluminum alloy strip obtained in comparative example 2
| Tensile strength/Rm | Elongation/percent | Ear production rate/%) |
| 181 | 7 | 3.2 |
As seen from Table 2, according to the technical scheme, the hot cracking tendency of the alloy ingot is increased due to the high content of Si; due to the high Mn content, the aluminum material has high tensile strength and high earing rate; because the Sn content is high, the improvement effects of the gluing resistance, the wear resistance, the friction reduction and the corrosion resistance are not obvious, and the manufacturing cost is increased; because the Fe/Si is low, a coarse needle-shaped FeSiAl phase is easily formed, the brittleness of the aluminum material is increased, and the rolling deformation is not easy to occur; the high initial rolling temperature and the high final rolling temperature of hot rolling lead to the increase of cost; the high cold rolling reduction rate results in high tensile strength and low elongation of the aluminum material.
Comparative example 3
An aluminum alloy strip for a power battery shell comprises the following components in percentage by mass: si: 0.22 wt%, Fe: 0.55 wt%, Cu: 0.55 wt%, Mn: 1.5 wt%, Sn: 0.045 wt%, Bi: 0.35 wt%, Mg: 0.008 wt%, Zn: 0.05 wt%, Ti: 0.006 wt%, Zr: 0.09 wt%, Fe/Si 2.5%, and the balance Al and inevitable impurities.
A method for preparing the aluminum alloy strip for the power battery shell comprises the following steps:
(1) casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy slab ingot;
(2) homogenization: after sawing, carrying out homogenization heat treatment on the flat ingot by heating at 630 ℃ and keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 500 ℃, the hot rolling is carried out until the thickness is 7.5mm, and the hot rolling finishing temperature is 345 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.2 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature at 380 ℃, discharging and cooling to room temperature;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to the thickness of 1.53mm through a final finished product, and simultaneously ensuring that the final cold rolling reduction rate is 30.5 percent to finally prepare the aluminum alloy strip for the power battery shell. The finished product was sawed and analyzed for properties as shown in table 3.
Table 3 results of performance tests on the aluminium alloy strip obtained in comparative example 3
| Tensile strength/Rm | Elongation/% of | Ear preparation rate/%) |
| 175 | 8 | 3.6 |
As seen from Table 3, according to the technical scheme, the tensile strength of the aluminum material is high due to the high Cu content; because the Bi content is high, the cutting performance is not obviously improved, and the manufacturing cost is increased; the welding performance of the aluminum material is reduced due to the high Zn content; because the Ti content is low, the grain refining effect is not obvious, and the elongation of the aluminum material is low; because of the high Zr content, the grain refining effect is not obvious, and the manufacturing cost is increased; due to high homogenization temperature, the phenomenon of overburning is generated, and the ear making rate is high; since the annealing temperature is high, the crystal grains are coarse, and the earing rate is high.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (9)
1. An aluminum alloy strip for a power battery shell, which is characterized in that: the composite material comprises the following components in percentage by mass: si: 0.07 to 0.18 wt%, Fe: 0.35-0.70 wt%, Cu: 0.05-0.20 wt%, Mn: 1.0 to l.5wt%, Sn: 0.015 to 0.2 wt%, Bi: 0.015 to 0.2 wt%, Mg: less than or equal to 0.02 wt%, Zn: less than or equal to 0.03 wt%, Ti: 0.03 to 0.05 wt%, Zr: not more than 0.05 wt%, Fe/Si 2-4 wt%, and the balance of Al and inevitable impurity elements.
2. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of the Fe is 0.55-0.65%.
3. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of the Cu is 0.05-0.10%.
4. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of Mn is 1.0-1.1%.
5. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of Sn is 0.015-0.04%.
6. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of Bi is 0.015-0.04%.
7. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of Ti is 0.03-0.05%.
8. The aluminum alloy strip for power battery cases as defined in claim 1, wherein: the mass percentage of the impurity elements is less than 0.05%.
9. The method for preparing the aluminum alloy strip for the power battery casing as set forth in any one of claims 1 to 8, wherein: the method comprises the following steps:
(1) Casting an ingot: according to the components of the aluminum alloy strip, after smelting, refining and online deslagging and degassing, the aluminum alloy raw material is semi-continuously cast into an aluminum alloy slab ingot;
(2) homogenizing: sawing the flat ingot, heating at 580-600 ℃, carrying out homogenization heat treatment for keeping the temperature for more than 8 hours, and then discharging and cooling to room temperature;
(3) milling: the cast ingot is subjected to double-sided milling, surface defects are removed, and then the cast ingot is put into a heating furnace for heating;
(4) hot rolling: discharging the ingot in the step (3) for hot rolling, wherein the initial rolling temperature is 485-505 ℃, the hot rolling is carried out until the thickness is 7.5 +/-0.2 mm, and the final hot rolling temperature is 320-360 ℃;
(5) cold rolling: rolling the hot rolled plate on a cold rolling mill to a strip with the edge cutting thickness of 2.0 +/-0.5 mm;
(6) intermediate annealing: carrying out intermediate annealing, controlling the annealing temperature to be 360-370 ℃, and cooling to room temperature after discharging;
(7) rolling a finished product: and (4) rolling the strip processed in the step (6) to a final finished product with the thickness of 1.5(0, +0.05) mm, and finally preparing the aluminum alloy strip for the power battery shell, wherein the cold rolling processing rate is 20-30%.
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| WO2012105144A1 (en) * | 2011-02-02 | 2012-08-09 | 日本軽金属株式会社 | Aluminum alloy sheet for battery case having good moldability and weldability |
| CN106119615A (en) * | 2016-08-17 | 2016-11-16 | 中铝瑞闽股份有限公司 | A kind of new energy resource power battery shell aluminium alloy strips and preparation method thereof |
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| CN106119615A (en) * | 2016-08-17 | 2016-11-16 | 中铝瑞闽股份有限公司 | A kind of new energy resource power battery shell aluminium alloy strips and preparation method thereof |
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