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Aluminum alloy strip for power battery shell and preparation method of aluminum alloy strip

A technology of aluminum alloy strips and power batteries, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of high ear-making rate, poor deep drawing performance, and easy sticking of aluminum materials to the mold, so as to prolong life and performance Optimized and not easy to stick to the mold

Pending Publication Date: 2022-07-15
NANTONG HENGJIN COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of aluminum alloy strip for power battery casing and its preparation method in view of the defects of the existing material such as poor deep drawing performance, high ear-making rate and easy sticking of aluminum to the mold.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An aluminum alloy strip for a power battery case, the composition of which is: Si: 0.2wt%, Fe: 0.55wt%, Cu: 0.05wt%, Mn: 1.0wt%, Sn: 0.01wt% , Bi: 0.01wt%, Mg: 0.02wt%, Zn: 0.03wt%, Ti: 0.03wt%, Zr: 0.05wt%, Fe / Si=2.75%, and the balance is Al and inevitable impurities.

[0029] A method for preparing the above-mentioned aluminum alloy strip for power battery casing, comprising the following steps:

[0030] (1) Casting ingot: According to the composition of the aluminum alloy strip, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy flat ingot after smelting, refining, on-line slag removal and degassing;

[0031] (2) Homogenization: After the flat ingot is sawed, it is heated at 590 ° C and kept for more than 8 hours for homogenization heat treatment, and then it is cooled to room temperature;

[0032] (3) Milling: The ingot is milled on both sides to remove surface defects, and then loaded into a heating furnace for heating;...

Embodiment 2

[0039] An aluminum alloy strip for a power battery casing, in terms of mass percentage, its composition is: Si: 0.23wt%, Fe: 0.6wt%, Cu: 0.10wt%, Mn: 1.3wt%, Sn: 0.03wt% , Bi: 0.03wt%, Mg: 0.02wt%, Zn: 0.03wt%, Ti: 0.04wt%, Zr: 0.05wt%, Fe / Si=2.4%, and the balance is Al and inevitable impurities.

[0040] A method for preparing the above-mentioned aluminum alloy strip for power battery casing, comprising the following steps:

[0041] (1) Casting ingot: According to the composition of the aluminum alloy strip, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy flat ingot after smelting, refining, on-line slag and degassing;

[0042] (2) Homogenization: After the flat ingot is sawed, it is heated at 600°C and kept for more than 8 hours for homogenization heat treatment, and then it is cooled to room temperature;

[0043] (3) Milling: The ingot is milled on both sides to remove surface defects, and then loaded into a heating furnace f...

Embodiment 3

[0050] An aluminum alloy strip for a power battery casing, in terms of mass percentage, its composition is: Si: 0.25wt%, Fe: 0.7wt%, Cu: 0.2wt%, Mn: 1.5wt%, Sn: 0.05wt% , Bi: 0.05wt%, Mg: 0.02wt%, Zn: 0.03wt%, Ti: 0.05wt%, Zr: 0.05wt%, Fe / Si=2.8%, and the balance is Al and inevitable impurities.

[0051] A method for preparing the above-mentioned aluminum alloy strip for power battery casing, comprising the following steps:

[0052] (1) Casting ingot: According to the composition of the aluminum alloy strip, the aluminum alloy raw material is semi-continuously cast into a 480x1200x5500mm aluminum alloy flat ingot after smelting, refining, on-line slag and degassing;

[0053](2) Homogenization: After the flat ingot is sawed, it is heated at 595°C and kept for more than 8 hours for homogenization heat treatment, and then it is cooled to room temperature;

[0054] (3) Milling: The ingot is milled on both sides to remove surface defects, and then loaded into a heating furnace for...

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Abstract

The invention discloses an aluminum alloy strip for a power battery shell, which comprises the following components in percentage by mass: 0.07 to 0.18 weight percent of Si, 0.35 to 0.70 weight percent of Fe, 0.05 to 0.20 weight percent of Cu, 1.0 to 1.5 weight percent of Mn, 0.015 to 0.2 weight percent of Sn, 0.015 to 0.2 weight percent of Bi, less than or equal to 0.02 weight percent of Mg, less than or equal to 0.03 weight percent of Zn, 0.03 to 0.05 weight percent of Ti, less than or equal to 0.05 weight percent of Zr, 2 to 4 percent of Fe / Si and the balance of Al and inevitable impurities. The method for preparing the aluminum alloy strip for the power battery shell comprises the following steps: casting a cast ingot; performing homogenization; milling is conducted; hot rolling; cold rolling; intermediate annealing; and rolling finished products. The die sticking phenomenon in the punching process is avoided, the service life of the die is prolonged, and the preparation method is economical and easy to popularize.

Description

[0001] This application is a divisional application for an invention patent with an application date of September 3, 2019, an application number of 201910825885.1, and an invention title of "Aluminum alloy strip for power battery housing and its preparation method". technical field [0002] The invention belongs to the field of preparation of aluminum alloy strips, in particular to an aluminum alloy strip for power battery casings and a preparation method thereof. Background technique [0003] As the main energy storage element of new energy vehicles, power battery directly determines the performance of electric vehicles. As an important part of the power battery, the power battery shell directly determines the performance of the power battery. [0004] Al-Mn-based 3000-series alloys are gradually used as raw materials for the manufacture of containers for secondary batteries such as new energy power lithium-ion batteries due to their superior strength, formability, and lase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04C21D8/02H01M50/119
CPCC22C21/00C22F1/04C21D8/0226C21D8/0236C21D8/0268H01M50/119
Inventor 孙国君杨晚平俞新峰黄嘉卫王俊杰
Owner NANTONG HENGJIN COMPOSITE MATERIALS
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