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Aluminum foil, preparation method, aluminum plastic film using aluminum foil and battery

A technology of aluminum-plastic film and aluminum foil, which is applied in the direction of chemical instruments and methods, applications, electronic equipment, etc., can solve the problems of material reliability decline, corrosion perforation, material working life decline, etc., and achieve good corrosion resistance life of coolant, good Effect of corrosion resistance and corrosion morphology, good deep-drawing formability

Inactive Publication Date: 2019-10-22
谢彦君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ⑴ It needs to have extremely high barrier properties. Poor barrier properties will reduce the specific capacity of polymer lithium-ion batteries, make the batteries bulge, lead to a decrease in cycle life and electrochemical performance, and seriously cause the battery to fail
[0008] The antifreeze system is generally weakly alkaline, and the general pH is around 8.5. Under weakly alkaline conditions, the dense oxide film formed on the surface of the aluminum alloy is easily destroyed, and the aluminum alloy is prone to uneven corrosion, and the overall reliability of the material decreases. , causing the actual working life of the material to decrease or even short-term corrosion and perforation, resulting in battery failure
[0009] At present, the traditional aluminum-plastic film has a double-sided film structure, and its surface film is made of polymer materials, which are prone to aging after long-term immersion in the antifreeze system. Once the film material is damaged, the internal aluminum foil is easily damaged in the antifreeze system. Corrosion or even perforation will cause the battery to fail. At the same time, the use environment of large-capacity automotive power batteries is different from that of ordinary electronic product batteries, and there is a greater risk of impact. Therefore, in order to ensure the reliability of the battery, the overall structure and reliability of the battery are required. needs to be improved

Method used

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  • Aluminum foil, preparation method, aluminum plastic film using aluminum foil and battery
  • Aluminum foil, preparation method, aluminum plastic film using aluminum foil and battery
  • Aluminum foil, preparation method, aluminum plastic film using aluminum foil and battery

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Experimental program
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Effect test

Embodiment 1~4

[0114] Melting of core layer and protective layer alloy ingot

[0115] The smelting of the alloy is heated by a high-frequency induction furnace. The addition of Mn, Si and Fe elements is in the form of an intermediate alloy, and the addition of Zn elements in the protective layer alloy is in the form of a pure alloy. Calculation and preparation of alloys with different components . The crucible used for smelting is graphite crucible, put pure aluminum in the crucible, turn on the high-frequency induction furnace for heating, after the aluminum ingot melts, start to add alloy elements, first add Mn element, after melting, add Si, Fe intermediate alloy, protective layer Add Zn ingots to the alloy, stir the melt after melting, refine it with a refining agent, stir it fully, keep it warm for a period of time, and then cast it. The casting mold uses a graphite mold, which is preheated before casting, and the size of the casting ingot is 250*150*30mm 3 After the casting is comple...

Embodiment 1

[0122] The preparation method of embodiment 1:

[0123] Heat treatment and rolling of ingot:

[0124] Preparation of A core layer:

[0125] (1) Perform homogenization heat treatment on the core layer alloy ingot, the heat treatment temperature is 450°C, and the heat treatment time is 2 hours;

[0126] (2) Then hot rolling at 450°C to a thickness of 9mm to obtain a core sheet;

[0127] Preparation of B protective layer:

[0128] (1) Perform homogenization heat treatment on the protective layer alloy ingot to make the distribution of alloy elements in the material more uniform. The heat treatment temperature is 450°C and the heat treatment time is 2 hours;

[0129] (2) Then hot rolling at 450°C to a thickness of 1mm to obtain a protective layer sheet;

[0130] C Then, the core sheet and the protective layer sheet are bonded by hot pressing to obtain a composite sheet of the core sheet and the protective layer, and then hot-rolled at 450°C to 2.5mm, and then cold-rolled to 0....

Embodiment 2

[0132] The preparation method of embodiment 2:

[0133] Preparation of A core layer:

[0134] (1) Perform homogenization heat treatment on the core alloy ingot, the heat treatment temperature is 600°C, and the heat treatment time is 10 hours;

[0135] (2) Then hot rolling at 500°C to a thickness of 7mm to obtain a core sheet;

[0136] Preparation of B protective layer:

[0137] (1) Perform homogenization heat treatment on the protective layer alloy ingot to make the distribution of alloy elements in the material more uniform. The heat treatment temperature is 600°C and the heat treatment time is 10 hours;

[0138] (2) Then hot rolling at 500°C to a thickness of 3mm to obtain a protective layer sheet;

[0139] C Then the core layer sheet and the protective layer sheet are adhered by hot pressing to obtain a composite sheet of the core layer sheet and the protective layer, and then hot rolled to 3 mm at 500 ° C, and then cold rolled to 0.3 mm;

[0140] D. Diffusion annealing...

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Abstract

The invention provides composite layer aluminum foil and an aluminum plastic film using the same. A core layer of the aluminum foil is prepared from the following components in percentage by weight: greater than or equal to 0.1% and less than or equal to 1.0% of Si, greater than or equal to 0.1% and less than or equal to 1.8% of Fe, greater than or equal to 0.1% and less than or equal to 1.8% of Mn and the balance of Al; and a protection layer of the aluminum foil is prepared from the following components in percentage by weight: greater than or equal to 0.1% and less than or equal to 1.5% ofSi, greater than or equal to 0.1% and less than or equal to 2.0% of Fe, greater than or equal to 0.1% and less than or equal to 8.0% of Zn, greater than or equal to 0.1% and less than or equal to 0.3%of Mn and the balance of Al. The aluminum foil is good in corrosion resistance and deformability. The invention further provides a battery packaged with the aluminum plastic film.

Description

technical field [0001] The invention relates to an aluminum foil used for lithium-ion battery packaging, a manufacturing method thereof, an aluminum-plastic film and a battery using the aluminum foil. Background technique [0002] With the increasing demand for lithium-ion batteries in the market, the packaging materials of lithium-ion batteries have increasingly become the focus of attention. Among them, the flexible packaging materials of lithium-ion batteries are relatively resistant to liquid chemicals such as corrosive acids, alkalis, salts or organic solvents. High stability, its design, manufacture and application technology have become one of the technical problems to be solved in the lithium battery industry. Because the flexible packaging material is in direct contact with the internal materials of the battery, there are strict requirements for the use of flexible packaging materials, two of which are very important: [0003] (1) It needs to have extremely high ba...

Claims

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Application Information

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IPC IPC(8): B32B15/01B32B37/06B32B37/08B32B37/10
CPCB32B15/017B32B37/06B32B37/08B32B37/10B32B2307/714B32B2457/10
Inventor 不公告发明人
Owner 谢彦君
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