阅读说明：本技术 锂电池用1100合金12μm双面光铝箔及其制备方法 (1100 alloy 12-micrometer double-sided smooth aluminum foil for lithium battery and preparation method thereof ) 是由 李俊 王强 张子正 于 2020-05-12 设计创作，主要内容包括：本发明属于铝合金材料技术领域,涉及双面光铝箔,尤其涉及一种锂电池用1100合金12μm双面光铝箔,其成分及其质量百分比为：Cu：0.15～0.18％；Fe：0.50～0.70％；Si：0.20～0.30％；Mn：≤0.01％；Mg：≤0.01％；Ti：≤0.03％；余量为Al及其他不可避免杂质元素。本发明还公开了所述铝箔的制备方法,包括熔铸→铣面→热轧→冷轧、均匀化退火→箔轧→分切。本发明采用改进的1100合金,合金元素配比合理,工艺科学,有利于提高产品的机械性能指标,抗拉强度和延伸率均高于国内同类产品,可以满足锂电池用铝箔客户的使用要求。(The invention belongs to the technical field of aluminum alloy materials, relates to a double-sided polished aluminum foil, and particularly relates to a 1100 alloy 12 mu m double-sided polished aluminum foil for a lithium battery, which comprises the following components in percentage by mass: cu: 0.15 to 0.18 percent; fe: 0.50-0.70%; si: 0.20-0.30%; mn: less than or equal to 0.01 percent; mg: less than or equal to 0.01 percent; ti: less than or equal to 0.03 percent; the balance of Al and other inevitable impurity elements. The invention also discloses a preparation method of the aluminum foil, which comprises fusion casting → surface milling → hot rolling → cold rolling, homogenizing annealing → foil rolling → slitting. The invention adopts the improved 1100 alloy, has reasonable alloy element proportion and scientific process, is beneficial to improving the mechanical property index of the product, has higher tensile strength and elongation than domestic similar products, and can meet the use requirements of aluminum foil customers for lithium batteries.)

1. A1100 alloy 12-micron double-sided smooth aluminum foil for a lithium battery is characterized by comprising the following components in percentage by mass: cu: 0.15 to 0.18 percent; fe: 0.50-0.70%; si: 0.20-0.30%; mn: less than or equal to 0.01 percent; mg: less than or equal to 0.01 percent; ti: less than or equal to 0.03 percent; the balance of Al and other inevitable impurity elements.

2. The 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 1, wherein the components and the mass percentages thereof are as follows: cu: 0.15 percent; fe: 0.50 percent; si: 0.20 percent; mn: 0.002%; mg: 0.002%; ti: 0.01 percent; the balance of Al and other inevitable impurity elements.

3. The 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 1, wherein the components and the mass percentages thereof are as follows: cu: 0.0165 percent; fe: 0.60 percent; si: 0.25 percent; mn: 0.006%; mg: 0.006%; ti: 0.02 percent; the balance of Al and other inevitable impurity elements.

4. The 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 1, wherein the components and the mass percentages thereof are as follows: cu: 0.18 percent; fe: 0.70 percent; si: 0.30 percent; mn: 0.01 percent; mg: 0.01 percent; ti: 0.03 percent; the balance of Al and other inevitable impurity elements.

5. A method for preparing a 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in any one of claims 1 to 4, comprising the steps of:

A. casting: heating the raw materials and the electrolytic aluminum water which meet the components and the mass percentage thereof in a smelting furnace, smelting into an aluminum alloy melt, and then carrying out ingot casting, wherein the thickness of the ingot casting is 600 mm;

B. milling a surface: carrying out surface milling treatment on the cast ingot to remove the surface, the head and the tail, wherein the surface milling thickness is 12-13 mm;

C. hot rolling: carrying out hot rolling on the aluminum ingot, wherein the hot rolling adopts 13 rough rolling, and then carrying out 3-pass finish rolling, and the thickness is 4mm after the rolling;

D. cold rolling and intermediate homogenizing annealing: performing 4-pass cold rolling on the cooled coil, performing homogenization annealing when the thickness of the blank is reduced to 0.5mm, and then reducing the thickness of the 0.5mm blank to 0.26mm after the annealing is finished;

E. foil rolling: rolling the cold-rolled aluminum plate into a double-sided polished aluminum foil coil with the thickness of 12 mu m through five passes;

F. slitting: cutting to obtain the final product.

6. The method for preparing a 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 5, wherein: and B, when the surface is milled in the step B, the thickness of the aluminum ingot before the surface is milled is 600mm, and the thickness of the aluminum ingot after the surface is milled is 575mm, namely the thickness of the milled surface is 12-13 mm.

7. The method for preparing a 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 5, wherein: and D, during cold rolling, the first pass is pressed from 4.0mm to 2.1mm, the second pass is pressed from 2.1mm to 1.0mm, the third pass is pressed from 1.0mm to 0.5mm, and the fourth pass is pressed from 0.5mm to 0.26mm after homogenization annealing.

8. The method for preparing a 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 5, wherein: and D, during the homogenizing annealing, heating to 560 ℃ in the annealing furnace through primary annealing treatment, preserving heat for 25 hours, reducing the temperature in the annealing furnace to 520 ℃, preserving heat for 8 hours, finishing the procedure, cooling for 6 hours, and discharging.

9. The method for preparing a 1100 alloy 12 μm double-sided optical aluminum foil for a lithium battery as claimed in claim 5, wherein: and E, when the aluminum foil is subjected to finish rolling, rolling the aluminum foil from 0.26mm to 0.13mm in the first pass, rolling the aluminum foil from 0.13mm to 0.065mm in the second pass, rolling the aluminum foil from 0.065mm to 0.030mm in the third pass, rolling the aluminum foil from 0.030mm to 0.0165mm in the fourth pass, and rolling the aluminum foil from 0.0165mm trimming to 0.012mm in the fifth pass.

Technical Field

The invention belongs to the technical field of aluminum alloy materials, relates to a double-sided polished aluminum foil, and particularly relates to a 1100 alloy 12-micrometer double-sided polished aluminum foil for a lithium battery and a preparation method thereof.

Background

With the rapid popularization and development of new energy automobiles, the requirement on the cruising ability of the new energy automobiles is higher and higher, so that the requirement on the improvement of the energy density of the lithium battery is more and more urgent. In order to improve the energy density of the lithium battery, aluminum foil thinning is a method for improving the energy density, but the aluminum foil thinning is easy to generate a tape breaking phenomenon in the production and rolling process of the lithium battery, so that the demand of high-performance aluminum foils for the lithium battery is gradually increased.

The 1235 alloy single-sided smooth aluminum foil generally used in China at present has general performance, and poor tensile strength and elongation, so that the overall performance of the lithium battery is general. The 12-micron double-sided polished high-performance aluminum foil is high in required dimensional accuracy, high in tensile strength and elongation rate, uniform and clean in surface color and luster, free of quality defects such as corrosion marks, color difference, scratches and transverse striations, and the like, and is applied to lithium batteries gradually.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a 1100 alloy 12-micron double-sided optical aluminum foil for a high-performance lithium battery.

Technical scheme

A1100 alloy 12-micron double-sided smooth aluminum foil for a lithium battery comprises the following components in percentage by mass: cu: 0.15 to 0.18 percent; fe: 0.50-0.70%; si: 0.20-0.30%; mn: less than or equal to 0.01 percent; mg: less than or equal to 0.01 percent; ti: less than or equal to 0.03 percent; the balance of Al and other inevitable impurity elements.

In a preferred embodiment of the invention, the 1100 alloy 12 μm double-sided smooth aluminum foil for the lithium battery comprises the following components in percentage by mass: cu: 0.15 percent; fe: 0.50 percent; si: 0.20 percent; mn: 0.002%; mg: 0.002%; ti: 0.01 percent; the balance of Al and other inevitable impurity elements.

In a preferred embodiment of the invention, the 1100 alloy 12 μm double-sided smooth aluminum foil for the lithium battery comprises the following components in percentage by mass: cu: 0.0165 percent; fe: 0.60 percent; si: 0.25 percent; mn: 0.006%; mg: 0.006%; ti: 0.02 percent; the balance of Al and other inevitable impurity elements.

In a preferred embodiment of the invention, the 1100 alloy 12 μm double-sided smooth aluminum foil for the lithium battery comprises the following components in percentage by mass: cu: 0.18 percent; fe: 0.70 percent; si: 0.30 percent; mn: 0.01 percent; mg: 0.01 percent; ti: 0.03 percent; the balance of Al and other inevitable impurity elements.

The invention also discloses a preparation method of the 1100 alloy 12-micron double-sided smooth aluminum foil for the lithium battery, which comprises the following steps:

A. casting: heating the raw materials and the electrolytic aluminum water which meet the components and the mass percentage thereof in a smelting furnace, smelting into an aluminum alloy melt, and then carrying out ingot casting, wherein the thickness of the ingot casting is 600 mm;

B. milling a surface: carrying out surface milling treatment on the cast ingot to remove the surface, the head and the tail, wherein the surface milling thickness is 12-13 mm;

C. hot rolling: carrying out hot rolling on the aluminum ingot, wherein the hot rolling adopts 13 rough rolling, and then carrying out 3-pass finish rolling, and the thickness is 4mm after the rolling;

D. cold rolling and intermediate homogenizing annealing: performing 4-pass cold rolling on the cooled coil, performing homogenization annealing when the thickness of the blank is reduced to 0.5mm, and then reducing the thickness of the 0.5mm blank to 0.26mm after the annealing is finished;

E. foil rolling: rolling the cold-rolled aluminum plate into a double-sided polished aluminum foil coil with the thickness of 12 mu m through five passes;

F. slitting: cutting to obtain the final product.

In the preferred embodiment of the invention, when the surface is milled in the step B, the thickness of the aluminum ingot before the surface is milled is 600mm, and the thickness of the aluminum ingot after the surface is milled is 575mm, namely the thickness of the milled surface is 12-13 mm.

In the preferred embodiment of the invention, during the cold rolling in the step D, the first pass is pressed from 4.0mm to 2.1mm, the second pass is pressed from 2.1mm to 1.0mm, the third pass is pressed from 1.0mm to 0.5mm, and the fourth pass is pressed from 0.5mm to 0.26mm after the homogenization annealing.

In the preferred embodiment of the invention, during the homogenizing annealing in the step D, the annealing treatment is carried out for one time, the annealing furnace is heated to 560 ℃ and is kept for 25 hours, then the temperature in the annealing furnace is reduced to 520 ℃, and is kept for 8 hours, the procedure is finished, and the annealing furnace is cooled for 6 hours and taken out.

In a preferred embodiment of the present invention, in the step E, when the aluminum foil is finish rolled, the first pass is rolled from 0.26mm to 0.13mm, the second pass is rolled from 0.13mm to 0.065mm, the third pass is rolled from 0.065mm to 0.030mm, the fourth pass is rolled from 0.030mm to 0.0165mm, and the fifth pass is rolled from 0.0165mm to 0.012 mm.

Advantageous effects

The invention adopts the improved 1100 alloy, has reasonable alloy proportion and scientific process, is beneficial to improving the mechanical property index of the product, has higher tensile strength and elongation than domestic similar products, and can meet the use requirements of aluminum foil customers for lithium batteries.

Detailed Description

The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.

Unless otherwise defined, terms (including technical and scientific terms) used herein should be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.