A kind of annealing treatment of aluminum foil for lithium battery

An annealing treatment and lithium battery technology, which is applied in the processing field of aluminum alloy materials, can solve the problem of not meeting the performance requirements of lithium battery aluminum foil, and achieve the effect of small footprint, stable performance, and clean surface without residual oil.

Active Publication Date: 2018-05-11
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

[0033] 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%.

[0034] 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:

[0035] 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 perform multiple refining treatments. The time for the first nitrogen refining treatment is 20 minutes. To remove surface scum, after the first refining treatment (that is, from the second refining treatment), the refining time is 22 minutes, and the interval is 2.5 ...

Embodiment 2

[0044] 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.

[0045] 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:

[0046] 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

[0055] 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.

[0056] 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:

[0057] 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 an annealing treatment of aluminum foil for lithium batteries, belonging to the technical field of aluminum alloy material processing. The annealing treatment of the aluminum foil for lithium batteries is as follows: the annealing treatment includes the following steps: first cold rolling the aluminum foil blank for lithium batteries to 4.0-5.0 mm, and then performing the first annealing treatment; The billet is roughly rolled to 0.25-0.3mm, followed by a second annealing treatment; wherein, the temperature in the annealing furnace during the first annealing treatment is 585-590°C, heated for 15-20h, when the surface temperature of the billet reaches 460-475°C, Lower the temperature in the annealing furnace to 460-480°C and keep it warm for 3-6 hours; during the second annealing treatment, the temperature in the annealing furnace is 190-220°C and heat for 8-10 hours. When the surface temperature of the billet reaches 165-170°C, the The temperature inside drops to 195-205°C and keeps warm for 6-8h. The invention rationally arranges the secondary annealing treatment, improves the composition segregation in the alloy casting and rolling process, and improves the original casting and rolling structure to obtain a product with uniform composition, uniform structure and stable performance, thereby improving the performance of the aluminum foil for lithium batteries.

Description

technical field [0001] The invention relates to an annealing treatment of aluminum foil for lithium batteries, belonging to the technical field of processing aluminum alloy materials. 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 ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04
Inventor 丁戎江蔡健周荣华丁魏巍
Owner 浙江中金铝业有限公司
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