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Preparation method for producing high-toughness battery aluminum foil through short-process cast-rolled blank

A high-toughness, short-process technology, applied in the direction of metal rolling, etc., can solve the problems of aluminum foil barrier properties, drawing performance, low strength and toughness, etc., to ensure surface cleanliness, improve material structure comprehensive performance, and ensure grain structure uniform effect

Pending Publication Date: 2020-06-30
JIANGSU DINGSHENG NEW MATERIAL JOINT STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention provides a preparation method for producing high-toughness battery aluminum foil by using a short-flow cast-rolled slab, which solves the problems in the prior art that the aluminum foil barrier property, drawing forming performance, and strength and toughness are not high question

Method used

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preparation example Construction

[0047] The invention discloses a preparation method for producing high-toughness battery aluminum foil by using a short-flow cast-rolled slab, which comprises the following steps:

[0048] (1) Smelting, casting and rolling process: 8021 aluminum alloy is used for smelting, casting and rolling into billets of a certain thickness; the smelting and casting and rolling process must be deslagging and degassing clean to ensure uniform composition, and the melting temperature is less than 770°C. The temperature of the furnace is 750±20℃;

[0049] (2) Cold rolling, homogeneous high-temperature treatment: Carry out billet rolling on the billet in step (1), and the billet is rolled into a billet with a thickness of 2.0-6.5mm after 1~3 passes, the outer ring is welded, and The packing belt is tightened and transferred to an annealing furnace for production; and rolling oil is used for lubrication and cooling to obtain aluminum alloy coils;

[0050] (3) Intermediate rolling, longitudinal...

Embodiment 1

[0074] This embodiment includes the following steps:

[0075] (1) Smelting, casting and rolling process: 8021 aluminum alloy is used for smelting, smelting and casting and rolling. The slag removal and degassing must be done to ensure uniform composition. In the present embodiment, the mass percent of each composition in the 8021 alloy material is:

[0076] a. Add aluminum ingots and AL-Fe master alloys containing 20% ​​Fe or 75% Fe in the smelting furnace according to the above ratio, and control the ratio of each element in the aluminum alloy to Si=0.08% , Fe=1.45%, Cu: 0.06%, Mn<0.05%, Mg<0.05%, Cr<0.05%, Zn<0.05%, Ti=0.025%, the rest is Al; add modifier Sr: 0.015%; then in Melting at 760°C, refining after 6 hours of melting, refining with 99.99% high-purity argon inert gas and refining agent for 30 minutes, removing scum on the surface of the melt after completion, and repeating refining at intervals of 1 hour to complete the melting furnace smelting;

[0077] b. Put th...

Embodiment 2

[0095] This embodiment includes the following steps:

[0096](1) Smelting, casting and rolling process: 8021 aluminum alloy is used for smelting, smelting and casting and rolling. The process of smelting, smelting and casting and rolling must be clean of slag and degassing to ensure uniform composition. In this embodiment, the mass percentages of the components in the 8021 alloy material are: a. Add aluminum ingots and AL-Fe master alloys with a Fe mass content of 20% or a Fe content of 75% in the smelting furnace according to the above ratio % of additives, the ratio of each element in the aluminum alloy is controlled as Si=0.055%, Fe=1.42%, Cu: 0.02%, Mn<0.05%, Mg<0.05%, Cr<0.05%, Zn<0.05%, Ti= 0.03%, the rest is Al; add modifier Sr: 0.02%; then melt at 770°C for 4.5 hours and refine with 99.99% high-purity argon inert gas and refining agent for 20 minutes, remove the melt The scum on the body surface is refined again at an interval of 1 hour, and the smelting in the smelti...

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Abstract

The invention discloses a preparation method for producing high-toughness battery aluminum foil through a short-process cast-rolled blank. The preparation method sequentially comprises the proceduresof smelting, cast rolling, cold rolling, homogeneous high-temperature treatment, intermediate rolling, longitudinal shearing edge cutting, intermediate annealing, finish rolling, foil rolling, coiling, finished product rolling, slitting and charging annealing. Compared with existing aluminum alloy material, the aluminum foil is high in barrier property, excellent in deep drawing property, good indeformability, high in puncture resistance, good in sealing property, fine and smooth in surface, high in cleanliness and short in process, meanwhile, through an innovative segmented multistage mode,online degassing and a filtering purifying device, the content of hydrogen and oxidized slag inclusions in molten aluminum is effectively reduced, and quality defects, caused by the generation of holes and pinholes, of the battery aluminum foil are prevented; the aluminum foil has the advantages of good sealing performance, no liquid leakage, safety in use and the like; the technical requirementsof the battery aluminum foil with high deep drawing forming property, high cleanness, high toughness are met; and the aluminum foil has important practical value in production of a new energy lithiumbattery industry.

Description

technical field [0001] The invention relates to the field of aluminum foil production and processing, in particular to a preparation method for producing high-toughness battery aluminum foil by using a short-flow cast-rolled slab. Background technique [0002] Aluminum-plastic composite film has the incomparable advantages of good flexibility, moisture resistance, oxygen insulation, shielding, antistatic and other materials, and is currently widely used in food, medicine, chemical and other industries. Especially in the field of new energy batteries, the requirements for aluminum-plastic film packaging are more stringent, generally at least three layers from the inside to the outside. The aluminum-plastic film is mainly composed of an outer nylon layer (ON), a middle aluminum foil layer (AL), and an inner heat-sealing layer (usually cast polypropylene film CPP). The layers are separated by an adhesive to combine. Soft pack battery The soft pack is light and thin, with low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/06C22C1/03C22F1/04B21B1/40B21B1/28
CPCB21B1/28B21B1/40C22C1/026C22C1/03C22C1/06C22C21/00C22F1/04
Inventor 万宝伟徐成志董则防张彩龙王超新颜红军陈建华吕辰琛
Owner JIANGSU DINGSHENG NEW MATERIAL JOINT STOCK CO LTD
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