CN115896500B - Aluminum foil for battery and preparation method thereof - Google Patents
Aluminum foil for battery and preparation method thereof Download PDFInfo
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- CN115896500B CN115896500B CN202211625256.2A CN202211625256A CN115896500B CN 115896500 B CN115896500 B CN 115896500B CN 202211625256 A CN202211625256 A CN 202211625256A CN 115896500 B CN115896500 B CN 115896500B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 139
- 239000011888 foil Substances 0.000 title claims abstract description 137
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims description 68
- 238000003723 Smelting Methods 0.000 claims description 44
- 238000007670 refining Methods 0.000 claims description 43
- 239000002994 raw material Substances 0.000 claims description 38
- 238000005097 cold rolling Methods 0.000 claims description 32
- 238000001914 filtration Methods 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 22
- 239000012535 impurity Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 238000000576 coating method Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 18
- 229910001416 lithium ion Inorganic materials 0.000 description 18
- 239000000155 melt Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Abstract
The invention relates to an aluminum foil for a battery and a preparation method thereof. The tensile strength of the aluminum foil for the primary battery is improved from 145MPa to 170-185MPa by adjusting the alloy components and the heat treatment process, the strength is moderate, the elongation is improved from 2.5% to 3.0%, the tensile strength and the elongation reach the first level, and the breakage rate of the aluminum foil in the battery coating process is greatly reduced, so that the purposes of improving the efficiency and stabilizing the quality are achieved. The obtained aluminum foil has wide application prospect in the field of batteries.
Description
Technical Field
The invention relates to the field of aluminum foil materials, in particular to an aluminum foil for a battery and a preparation method thereof.
Background
In the preparation process of the aluminum foil, the raw materials are mainly aluminum alloys such as 1060 or 1070, and the material is prepared into a proper casting blank plate simply through smelting and cast rolling, and the material is generally low in strength, coarse in structure grains, low in elongation and poor in comprehensive mechanical property because other alloys are not added in the casting process for strengthening. Conventionally produced 1060 or 1070 aluminum foils often have a tensile strength of hardly exceeding 145MPa and often lead to breakage of the alloy foil due to insufficient strength.
If higher-strength aluminum alloy such as 1100 or 3003 alloy is used, the tensile strength of the alloy reaches more than 240MPa, but because the strength of the material is high, the offset deformation resistance is high in the rolling process, the alloy is forced to be produced by using a large rolling force in the rolling process, the rolling roll shape is disordered in the rolling process, the abnormal shape of the foil is caused, and the local edge tightening and the breakage of the strip occur, so that the breakage rate of the alloy cannot be reduced. How to develop an aluminum foil preparation technology with good mechanical properties and low breakage rate in the preparation process is a technical hot spot and a difficult point in the current industry.
Disclosure of Invention
In order to solve the problems in the prior art, an aspect of the present invention provides a method for preparing an aluminum foil for a battery, wherein the preparation method has a low breakage rate in a preparation process and excellent performance of the aluminum foil, and the preparation method comprises:
Preparing an aluminum foil raw material into an aluminum foil through smelting, cast rolling, cold rolling and foil binding;
The cold rolling process is a seven-pass cold rolling process;
the aluminum foil raw materials comprise the following components in percentage by weight:
Fe:0.3-0.5％；
Si:0.1-0.2％；
Cu:≤0.05％；
Mn:≤0.05％；
Mg:≤0.05％；
Zn:≤0.1％；
Ti:0.02-0.03％；
Al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
According to the preparation method of the aluminum foil for the battery, provided by the invention, the pinhole generation rate can be reduced on the basis of ensuring the comprehensive performance of the product by optimizing the formula of raw materials:
According to the preparation method of the aluminum foil for the battery, the aluminum foil raw materials preferably comprise the following components in percentage by weight: 0.48% of Fe; 0.12% of Si; cu is less than or equal to 0.05%; mn is less than or equal to 0.05%; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.02% of Ti; al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
According to the preparation method of the aluminum foil for the battery, the aluminum foil raw materials preferably comprise the following components in percentage by weight: 0.5% of Fe; 0.18% of Si; cu is less than or equal to 0.05%; mn is less than or equal to 0.05%; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.03% of Ti; al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
According to the preparation method of the aluminum foil for the battery, the aluminum foil raw materials preferably comprise the following components in percentage by weight: 0.42% of Fe; 0.12% of Si; cu is less than or equal to 0.05%; mn is less than or equal to 0.05%; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.025 percent of Ti; al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
According to the preparation method of the aluminum foil for the battery, preferably, the smelting process comprises the steps of refining all aluminum foil raw materials at 720-750 ℃ and standing for 1-3 hours after refining to obtain an aluminum melt.
According to the preparation method of the aluminum foil for the battery, the aluminum foil raw material preferably comprises an electrolytic aluminum melt.
According to the preparation method of the aluminum foil for the battery, the mass ratio of the solid raw material to the electrolytic aluminum melt in smelting is preferably 0.3-0.6: 1, refining time is 15-25 minutes, and refining is carried out every 2 hours.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the casting and rolling step comprises the following steps: degassing and filtering the aluminum melt obtained in the smelting step, and casting and rolling to obtain a blank with the thickness of 6.8-7.2 mm.
According to the preparation method of the aluminum foil for the battery, preferably, the filtering treatment is to adopt double-layer plate type filtering in a filtering box, and the specification of a filtering plate is 50ppi and 60ppi; the temperature of the filter box is controlled between 705 ℃ and 725 ℃.
According to the preparation method of the aluminum foil for the battery, the temperature of the box is preferably controlled between 690 and 698 ℃ before the casting and rolling process.
According to the preparation method of the aluminum foil for the battery, preferably, the cold rolling procedure is seven-pass cold rolling, wherein the blank is pressed from the initial thickness of the blank to 68% -72% of the initial thickness through the first pass, the blank is pressed from 69% -73% of the initial thickness to 52% -55% of the initial thickness through the second pass, the blank is pressed from 62% -55% of the initial thickness to 23% -27% of the initial thickness through the third pass, the blank is pressed from 22% -27% of the initial thickness to 14% -17% of the initial thickness through the fourth pass, the blank is pressed from 14% -17% of the initial thickness to 7% -10% of the initial thickness through the fifth pass, the blank is pressed from 7% -10% of the initial thickness to 4% -6% of the initial thickness through the sixth pass, and the cold rolled aluminum foil is obtained through the seventh pass.
According to the preparation method of the aluminum foil for the battery, preferably, the cold rolling procedure is seven-pass cold rolling, and the cold rolling procedure comprises the steps of pressing a blank from 7.0mm to 5.0mm through a first pass, pressing from 5.0mm to 3.8mm through a second pass, pressing from 3.8mm to 1.8mm through a third pass, pressing from 1.8mm to 1.1mm through a fourth pass, pressing from 1.1mm to 0.6mm through a fifth pass, pressing from 0.6mm to 0.35mm through a sixth pass and pressing from 0.35mm to 0.22mm through a seventh pass to obtain the cold rolled aluminum foil.
It is found that seven passes of rolling can achieve better aluminum foil performance and low breakage rate, and more or fewer passes can have adverse effects on product performance and breakage rate.
According to the preparation method of the aluminum foil for the battery, heat treatment is preferably carried out in the second pass, the temperature of furnace gas is controlled to be 550-560 ℃, when the temperature of the material reaches 530-540 ℃, the temperature of the furnace gas is adjusted to be 535 ℃, the temperature is kept for 3-5 hours, and the aluminum foil is discharged after being cooled along with the furnace for 2 hours; cooling for more than 12 hours after the fourth pass is finished.
According to the method for preparing the aluminum foil for the battery, the foil rolling process preferably comprises the step of rolling the cold-rolled aluminum foil into the aluminum foil with the thickness of 0.009-0.02 mm.
According to the preparation method of the aluminum foil for the battery, the thickness of the cold-rolled aluminum foil is preferably 0.22mm.
According to the preparation method of the aluminum foil for the battery, preferably, when the aluminum foil with the thickness of 0.009-0.01 mm is prepared by the foil rolling procedure, the steps are distributed as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009-0.01 mm.
According to the preparation method of the aluminum foil for the battery, preferably, when the aluminum foil with the thickness of 0.011-0.015 mm is prepared by the foil rolling procedure, the steps are distributed as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.030mm to 0.018mm, and the fifth pass is pressed from 0.018mm to 0.011-0.015 mm.
According to the preparation method of the aluminum foil for the battery, preferably, when the aluminum foil with the thickness of 0.016-0.02 is prepared by the foil rolling procedure, the steps are as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, and the fourth pass is pressed from 0.030mm to 0.016-0.02 mm.
In another aspect, the invention provides an aluminum foil for a battery, which is prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
The invention adjusts the alloy components and the heat treatment process, the tensile strength of the aluminum foil for the primary battery is improved from 145MPa to 170-185MPa from the original 1060 and 1070 aluminum alloys, the strength is moderate, the elongation is improved from the original 2.5% to the existing 3.0%, the tensile strength and the elongation reach the first level, the breakage rate of the battery in the coating process is greatly reduced, and the purposes of improving the efficiency and stabilizing the quality are achieved.
The invention adopts the liquid-solid ratio of (0.2-0.6): 1, keeps the solid-liquid ratio reasonable, ensures the strength of the foil, simultaneously reduces the impurity content of the original tissue and reduces the production of the pinhole of the foil, and the purity of the original aluminum reaches more than 99.90 percent.
The invention adopts a novel heat treatment process and high-temperature annealing, improves the internal structure of the aluminum alloy material, optimizes the mechanical property and ensures that the aluminum foil has stronger processability in the subsequent production process.
The invention optimizes the pass distribution, effectively improves the mechanical property of the material, optimizes the plate shape and improves the production efficiency of the product.
Drawings
Fig. 1 is a photograph of an aluminum foil prepared in example 1.
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the whole text of the invention, unless specified otherwise, the contents of the components are weight percent, and the ratio of the components is weight percent.
The performance test of each example and comparative example below uses national standard GB/T228-2010, and tensile test analysis is performed, and the data of each example and comparative example are shown in Table 1.
Example 1:
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.42% of Fe; s i:0.1%; 0.02% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; ti 0.023; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 550 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 530 ℃, the furnace gas is kept at the temperature for 3 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 1 hour after refining is completed, wherein the refining temperature is 720 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.3:1, refining time was 15 minutes, and refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 6.8 mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 705 ℃.
The temperature of the box is controlled at 690 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, rolling to produce the aluminum foil for the lithium ion battery foil with the thickness of 0.009 mm.
When producing aluminum foil with the thickness of 0.009mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009mm.
Example 2:
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.47% of Fe; si 0.2%; 0.04% of Cu; mn 0.04%; 0.04% of Mg; zn 0.01%; 0.03% of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 560 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 540 ℃, the temperature is kept for 5 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 3 hours after refining is completed, wherein the refining temperature is 750 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.6:1, refining time was 25 minutes, refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 7.2 mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 725 ℃.
The temperature of the box is controlled at 698 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, rolling to produce aluminum foil for lithium ion battery foil with the thickness of 0.02 mm.
When producing aluminum foil with the thickness of 0.02mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, and the fourth pass is pressed from 0.030mm to 0.02mm.
Example 3:
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.41% of Fe; 0.12% of Si; 0.04% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; 0.025 percent of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 555 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 535 ℃, the temperature is kept for 4 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 2 hours after refining is completed, wherein the refining temperature is 730 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.5:1, refining time was 20 minutes, and refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 7mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 720 ℃.
The temperature of the box is controlled at 695 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, an aluminum foil for lithium ion battery foil of 0.012mm is produced by rolling.
When producing aluminum foil with the thickness of 0.012mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.031mm to 0.017mm, and the fifth pass is pressed from 0.017mm to 0.012mm.
Example 4:
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.48% of Fe; 0.12% of Si; 0.04% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; 0.02% of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 560 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 530 ℃, the furnace gas is kept at the temperature for 3 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 1 hour after refining is completed, wherein the refining temperature is 750 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.6:1, refining time was 25 minutes, refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 6.8 mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 725 ℃.
The temperature of the box is controlled at 690 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, rolling to produce aluminum foil for lithium ion battery foil of 0.01 mm.
When producing aluminum foil with the thickness of 0.01mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.01mm.
Example 5:
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.5% of Fe; 0.18% of Si; 0.04% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; 0.025 percent of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 555 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 535 ℃, the temperature is kept for 4 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 2 hours after refining is completed, wherein the refining temperature is 730 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.4:1, refining time was 20 minutes, and refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 7mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 720 ℃.
The temperature of the box is controlled at 695 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, an aluminum foil for lithium ion battery foil of 0.012mm is produced by rolling.
When producing aluminum foil with the thickness of 0.012mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.031mm to 0.017mm, and the fifth pass is pressed from 0.017mm to 0.012mm.
Comparative example 1:
The aluminum foil for the ion battery provided by the comparative example is prepared from the following raw materials in percentage by mass: 0.42% of Fe; s i:0.1%; 0.11% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; 0.01% of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 4.0mm, the second pass is pressed from 4.0mm to 1.8mm, the third pass is pressed from 1.8mm to 1.1mm, the fourth pass is pressed from 1.1mm to 0.7mm, the fifth pass is pressed from 0.7mm to 0.4mm, the sixth pass is pressed from 0.4mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 550 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 530 ℃, the temperature is kept for 3 hours, and the furnace gas is discharged after being cooled for 2 hours along with the furnace; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 1 hour after refining is completed, wherein the refining temperature is 720 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.3:1, refining time was 15 minutes, and refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 6.8 mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 705 ℃.
The temperature of the box is controlled at 690 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, rolling to produce the aluminum foil for the lithium ion battery foil with the thickness of 0.009 mm.
When producing aluminum foil with the thickness of 0.009mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009mm.
Comparative example 2
The aluminum foil for the lithium ion battery is prepared from the following raw materials in percentage by mass: 0.42% of Fe; s i:0.1%; 0.11% of Cu; mn 0.05%; 0.05% of Mg; zn 0.02%; 0.01% of Ti; 99.35% of Al and the balance of unavoidable impurities.
The preparation method of the aluminum foil for the ion battery comprises the steps of smelting, cast rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the third pass, the temperature of furnace gas is controlled to 550 ℃, the temperature of the furnace gas is adjusted to 535 ℃ when the temperature of the material reaches 530 ℃, the furnace gas is kept at the temperature for 3 hours, and the furnace gas is discharged after being cooled along with the furnace for 2 hours; cooling was performed for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula, wherein the aluminum is an electrolytic aluminum melt, refining, and standing for 1 hour after refining is completed, wherein the refining temperature is 720 ℃.
The mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.9:1, refining time was 15 minutes, and refining was performed every 2 hours.
The casting and rolling method comprises the following steps: and (3) degassing and filtering the melt obtained in the smelting step to obtain a blank with the thickness of 6.8 mm.
Double-layer plate type filtration is adopted, and the specification of a filter plate is 50ppi and 60ppi; the temperature of the filter box is controlled at 705 ℃.
The temperature of the box is controlled at 690 ℃ before the casting and rolling process.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, rolling to produce the aluminum foil for the lithium ion battery foil with the thickness of 0.009 mm.
When producing aluminum foil with the thickness of 0.009mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009mm.
Table 1 test data for examples, comparative examples
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition. Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (7)
1. A method for preparing an aluminum foil for a battery, the method comprising:
preparing an aluminum foil raw material into an aluminum foil through smelting, cast rolling, cold rolling and foil rolling procedures;
The smelting process comprises the steps of refining each aluminum foil raw material at 720-750 ℃ for 1-3 hours after finishing refining to obtain aluminum melt;
The aluminum foil raw material comprises electrolytic aluminum melt, and the mass ratio of the solid raw material to the electrolytic aluminum melt in smelting is 0.3-0.6: 1, refining for 15-25 minutes, wherein refining is carried out once every 2 hours;
the cold rolling process is seven-pass cold rolling, which comprises the steps of pressing a blank from the initial thickness of the blank to 68% -72% of the initial thickness through a first pass, pressing the blank from 69% -73% of the initial thickness to 52% -55% of the initial thickness through a second pass, pressing the blank from 62% -55% of the initial thickness to 23% -27% of the initial thickness through a third pass, pressing the blank from 22% -27% of the initial thickness to 14% -17% of the initial thickness through a fourth pass, pressing the blank from 14% -17% of the initial thickness to 7% -10% of the initial thickness through a fifth pass, pressing the blank from 7% -10% of the initial thickness to 4% -6% of the initial thickness through a sixth pass, and pressing the blank from 4% -6% of the initial thickness to 2% -4% of the initial thickness through a seventh pass to obtain a cold-rolled aluminum foil;
the aluminum foil raw materials comprise the following components in percentage by weight:
Fe:0.3-0.5％；
Si:0.1-0.2％；
Cu:≤0.05％；
Mn:≤0.05％；
Mg:≤0.05％；
Zn:≤0.1％；
Ti:0.02-0.03％；
Al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
2. The method for producing an aluminum foil for a battery according to claim 1, wherein:
the aluminum foil raw materials comprise the following components in percentage by weight: 0.48% of Fe; 0.12% of Si; cu is less than or equal to 0.05%; mn is less than or equal to 0.05%; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.02% of Ti; al is more than or equal to 99.35 percent, and the balance is unavoidable impurities;
or the aluminum foil raw material comprises the following components in percentage by weight: 0.5% of Fe; 0.18% of Si; cu is less than or equal to 0.05%; mn is less than or equal to 0.05%; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.03% of Ti; al is more than or equal to 99.35 percent, and the balance is unavoidable impurities.
3. The method for producing an aluminum foil for a battery according to claim 1, wherein: the casting and rolling step comprises the following steps: degassing and filtering the aluminum melt obtained in the smelting step, and casting and rolling to obtain a blank with the thickness of 6.8-7.2 mm.
4. The method for producing an aluminum foil for a battery according to claim 3, wherein: the filtering treatment is to adopt double-layer plate type filtering in a filtering box, and the specification of a filtering plate is 50ppi and 60ppi; the temperature of the filter box is controlled between 705 and 725 ℃, and the temperature of the box is controlled between 690 and 698 ℃ before the casting and rolling process.
5. The method for producing an aluminum foil for a battery according to claim 1, wherein: carrying out heat treatment in the second pass, controlling the temperature of furnace gas to be 550-560 ℃, adjusting the temperature of the furnace gas to 535 ℃ when the temperature of the material reaches 530-540 ℃, preserving heat for 3-5 hours at the temperature, cooling for 2 hours along with the furnace, and discharging; cooling for more than 12 hours after the fourth pass is finished.
6. The method for producing an aluminum foil for a battery according to claim 5, wherein: the foil rolling procedure comprises the steps of rolling cold-rolled aluminum foil into aluminum foil with the thickness of 0.009-0.02 mm;
When the foil rolling procedure is used for preparing the aluminum foil with the thickness of 0.009-0.01 mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009-0.01 mm;
When the foil rolling procedure is used for preparing the aluminum foil with the thickness of 0.011-0.015 mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.030mm to 0.018mm, and the fifth pass is pressed from 0.018mm to 0.011-0.015 mm;
When the foil rolling procedure is used for preparing the aluminum foil with the thickness of 0.016-0.02, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, and the fourth pass is pressed from 0.030mm to 0.016-0.02 mm.
7. An aluminum foil for a battery, characterized in that the aluminum foil is prepared by the preparation method according to any one of claims 1 to 6.
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