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Method for preparing aluminum foil for lithium battery

A lithium battery and aluminum foil technology, applied in metal rolling and other directions, can solve the problem of not meeting the performance requirements of lithium battery aluminum foil, and achieve the effect of small footprint, low production cost, energy saving and environmental protection

Active Publication Date: 2015-11-18
浙江中金铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this preparation method can improve the compound crushing effect and dislocation distribution to a certain extent, refine the grain size, and improve the mechanical properties of the structure, it still cannot meet the ever-increasing performance requirements of aluminum foil for lithium batteries, and still needs to be studied. Material and preparation method of aluminum foil for lithium battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Ingredients: adjust the composition and mass percentage of aluminum foil for lithium batteries: Fe: 0.39%; Si: 0.12%; Cu: 0.04%; Ti: 0.016%; the balance is Al and unavoidable impurities, of which, Mn+Mg+ Zn≤0.03%.

[0035] Smelting, casting and rolling process: heat and melt the above-mentioned lithium battery with aluminum foil to form an aluminum alloy melt; Cast and rolled into a 7.0mm billet. Among them, refining slag removal, grain refinement, degassing and slag removal, filtration treatment, continuous casting and rolling are as follows:

[0036] a. Refining and slag removal: transfer the aluminum alloy melt to a static furnace for 15 minutes, the temperature of the static furnace is 745°C, and then carry out multiple refining treatments, the first nitrogen refining treatment time is 20 minutes, after refining To remove surface scum, after the first refining treatment (that is, from the second refining treatment), the refining time is 22 minutes, and the interva...

Embodiment 2

[0045] Ingredients: Adjust the composition and mass percentage of aluminum foil for lithium batteries: Fe: 0.40%; Si: 0.13%; Cu: 0.05%; Ti: 0.018%; Mn: ≤0.03%; Mg: ≤0.03%; Zn: ≤0.03 %; the balance is Al and unavoidable impurities.

[0046] Smelting, casting and rolling process: heat and melt the above-mentioned lithium battery with aluminum foil to form an aluminum alloy melt; Cast and rolled into a 7.0mm billet. Among them, refining slag removal, grain refinement, degassing and slag removal, filtration treatment, continuous casting and rolling are as follows:

[0047] a. Refining and slag removal: Transfer the aluminum alloy melt to a static furnace for 12 minutes. The temperature of the static furnace is 750°C, and then perform multiple refining treatments. The time for the first nitrogen refining treatment is 18 minutes. After refining, remove the slag. To remove surface scum, after the first refining treatment (that is, from the second refining treatment), the refining t...

Embodiment 3

[0056] Ingredients: Adjust the composition and mass percentage of aluminum foil for lithium batteries: Fe: 0.38%; Si: 0.15%; Cu: 0.04%; Ti: 0.02%; Mn: ≤0.03%; Mg: ≤0.03%; Zn: ≤0.03 %; the balance is Al and unavoidable impurities.

[0057] Smelting, casting and rolling process: heat and melt the above-mentioned lithium battery with aluminum foil to form an aluminum alloy melt; Cast and rolled into a 7.0mm billet. Among them, refining slag removal, grain refinement, degassing and slag removal, filtration treatment, continuous casting and rolling are as follows:

[0058] a. Refining and slag removal: Transfer the aluminum alloy melt to a static furnace for 18 minutes. The temperature of the static furnace is 740°C, and then perform multiple refining treatments. The time for the first nitrogen refining treatment is 22 minutes. After refining, remove the slag To remove surface scum, after the first refining treatment (that is, from the second refining treatment), the refining tim...

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Abstract

The invention relates to a method for preparing an aluminum foil for a lithium battery and belongs to the technical field of machining of aluminum alloy materials. The method for preparing the aluminum foil for the lithium battery includes the steps of performing smelting and cast rolling processes: heating and smelting raw materials of the aluminum foil for the lithium battery to form an aluminum alloy melt, sequentially carrying out refining slagging-off, grain refining, degassing deslagging and filtration treatment and subjecting the filtered aluminum alloy melt to continuous cast rolling to form a blank; performing a cold rolling process: subjecting the blank to cold rolling firstly and then to primary annealing treatment, rough rolling and secondary annealing treatment; performing foil pressing treatment: carrying out finish rolling on the annealed aluminum foil, and finally slitting the foil to obtain the aluminum foil finished product for a lithium battery finished product. According to the method for preparing the aluminum foil for the lithium battery, composition segregation in the process of alloy cast rolling is improved through added uniform annealing treatment; an original cast rolling structure is improved so that the product with uniform constituents and structure and stable performances can be obtained; moreover, the performances of the aluminum foil for the lithium battery can be improved.

Description

technical field [0001] The invention relates to a method for preparing aluminum foil for lithium batteries, and belongs to the technical field of aluminum alloy material preparation. Background technique [0002] With the improvement of people's living standards and the improvement of environmental awareness, the social demand for clean and environmentally friendly energy transportation tools is huge. Electric vehicles have become the main transportation tools in people's lives. The power battery as the power source of electric vehicles is lithium batteries. The positive electrode current collector of lithium batteries is aluminum foil. This aluminum foil requires high dimensional accuracy. The surface of aluminum foil has uniform color, clean, no corrosion marks, no color difference, no scratches, no horizontal lines and other defects, and the plate shape is flat. The alloy generally used to make aluminum foil is 1235. The performance of aluminum foil is average, which mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04B21B1/40
Inventor 丁戎江徐晓兵尹小玉蔡健
Owner 浙江中金铝业有限公司
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