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Aluminum foil for lithium battery aluminum-plastic film and its preparation process

A preparation process and technology of aluminum-plastic film, applied in the field of aluminum alloy materials, can solve the problems of insufficiency of electrolyte, insufficient drawing depth, etc., and achieve the effects of low oxygen and moisture permeability, high elongation, and good corrosion resistance.

Active Publication Date: 2022-01-18
江苏大亚电子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the performance of aluminum foil products for aluminum-plastic film for lithium batteries in my country, only a few technical indicators of enterprises can reach the level of Japanese companies. The depth is about 5mm, and the foreign ones are 8mm, even up to 15mm. There is still a certain gap between the overall and foreign products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition and mass percentage of aluminum foil for aluminum-plastic film for lithium batteries are: Si: 0.08%; Fe: 1.35%; Cu: 0.03%; Mn: 0.03%; Mg: 0.01%; Zn: 0.03%; Cr: 0.03%; Ti: 0.01%; the balance is Al and other unavoidable impurity elements, the blank is made of 8021 alloy, the tensile strength is 142MPa, and the elongation is 3.85%.

[0026] The preparation process of the aluminum foil for the aluminum-plastic film of the lithium battery comprises the following steps:

[0027] (1). Rough rolling: rough rolling is divided into two passes, the thickness of the billet used for rough rolling is 260 μm, and the thickness of the product after rough rolling is 120 μm;

[0028] (2). Intermediate rolling: the 120 μm aluminum plate obtained by rough rolling is subjected to one pass of intermediate rolling to obtain an aluminum plate with an exit thickness of 66 μm;

[0029] (3). Double-folding: double-folding aluminum foil with a thickness of 66 μm;

[0030] (4)....

Embodiment 2

[0039] The composition and mass percentage of aluminum foil for aluminum-plastic film for lithium batteries are: Si: 0.08%; Fe: 1.40%; Cu: 0.03%; Mn: 0.03%; Mg: 0.01%; Zn: 0.03%; Cr: 0.03%; Ti: 0.02%; the balance is Al and other unavoidable impurity elements, the blank is made of 8021 alloy, the tensile strength is 156MPa, and the elongation is 3.62%.

[0040] The preparation process of the aluminum foil for the aluminum-plastic film of the lithium battery comprises the following steps:

[0041] (1). Rough rolling: rough rolling is divided into two passes, the thickness of the billet used for rough rolling is 260 μm, and the thickness of the product after rough rolling is 120 μm;

[0042] (2). Intermediate rolling: the 120 μm aluminum plate obtained by rough rolling is subjected to one pass of intermediate rolling to obtain an aluminum plate with an exit thickness of 66 μm;

[0043] (3). Double bonding: double bonding of aluminum foil with a thickness of 66 μm;

[0044] (...

Embodiment 3

[0053] The composition and mass percentage of aluminum foil for aluminum-plastic film for lithium batteries are: Si: 0.08%; Fe: 1.45%; Cu: 0.03%; Mn: 0.03%; Mg: 0.01%; Zn: 0.03%; Cr: 0.03%; Ti: 0.03%; the balance is Al and other unavoidable impurity elements. The blank is made of 8021 alloy with a tensile strength of 160MPa and an elongation of 3.55%.

[0054] The preparation process of the aluminum foil for the aluminum-plastic film of the lithium battery comprises the following steps:

[0055] (1). Rough rolling: rough rolling is divided into two passes, the thickness of the billet used for rough rolling is 260 μm, and the thickness of the product after rough rolling is 120 μm;

[0056] (2). Intermediate rolling: the 120 μm aluminum plate obtained by rough rolling is subjected to one pass of intermediate rolling to obtain an aluminum plate with an exit thickness of 66 μm;

[0057] (3). Double bonding: double bonding of aluminum foil with a thickness of 66 μm;

[0058] ...

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Abstract

The invention belongs to the technical field of aluminum alloy materials, and relates to an aluminum foil for aluminum-plastic films of lithium batteries. The composition and mass percentage thereof are: Si: 0.08%; Fe: 1.35-1.45%; Cu: 0.03%; Mn: 0.03%; Mg: 0.01%; Zn: 0.03%; Cr: 0.03%; Ti: 0.01~0.03%; the balance is Al and other unavoidable impurity elements. The invention also discloses a preparation method of the aluminum foil for the aluminum-plastic film of the lithium battery, which includes rough rolling → intermediate rolling → rolling → finishing rolling → cutting → annealing. The present invention adopts the improved 8021 alloy, and the ratio of the alloy elements is reasonable. The present invention adopts the 8021 alloy, and adjusts the alloy composition within the scope of the national standard. When rolling the aluminum foil, it adopts four passes of large reduction and high-speed rolling; it adopts medium and high temperature annealing, Guarantee the deep-drawing performance of the product and the A-level effect of water brushing. The product has high elongation, good corrosion resistance, low oxygen and moisture permeability, and high composite strength, which can meet the requirements of lithium battery aluminum-plastic film for aluminum foil.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and relates to an aluminum foil for an aluminum-plastic film of a lithium battery and a preparation process thereof. Background technique [0002] With the rapid popularization and development of new energy vehicles, the requirements for safety, weight and capacity are getting higher and higher, so the requirements for improving the safety of lithium batteries are becoming more and more urgent. Soft-pack lithium batteries are widely used in consumer electronics, automobiles, military, medical, power tools and other industries due to their advantages of good safety performance, light weight, large capacity, low internal resistance, and flexible design. The essence of the soft-pack lithium battery is actually a liquid lithium-ion battery covered with a polymer shell, and its performance is so excellent, the most important thing is the aluminum-plastic film in the polymer shell, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C21D9/46C22C21/00B21B1/40B21B3/00
CPCC22F1/04C21D9/46C22C21/00B21B1/40B21B3/00B21B2003/001
Inventor 李俊夏俊杰颜建军赵岩毛国回张德林
Owner 江苏大亚电子新材料科技有限公司
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