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A method for producing aluminum strips for power battery casings by casting and rolling

A power battery and casting-rolling technology, which is applied in the field of aluminum alloy material manufacturing, can solve the problems of difficult stretching and forming of the battery case, coarse material grain structure, and prone to manganese segregation, etc., so as to reduce structure and grain unevenness , shorten the cycle, and ensure the effect of normal production

Active Publication Date: 2018-06-19
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

The difficulty lies in the fact that the 3003 alloy billet produced by the casting and rolling method has poor structure uniformity, a large number of second-phase compounds, and a high manganese content, which is prone to manganese segregation during production, resulting in a coarse grain structure of the material after subsequent heat treatment. Subsequent overall stretching of the battery case is difficult to carry out, and the thickness of the aluminum strip used for the power battery case is generally more than 0.8mm, and the produced case is relatively large, which has high requirements on the uniformity and stretchability of the aluminum strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Smelting iron 0.60% by weight; silicon 0.25%; iron / silicon ratio 2.4; copper 0.18%; manganese 1.25%; National standard range, generally the content of a single impurity element ≤ 0.05%, the total content of miscellaneous elements ≤ 0.15%) and aluminum (aluminum is the balance) for the proportioning of 3003 alloy raw materials, all use aluminum ingots for remelting, without adding any form waste.

[0021] 2. Melt the raw materials and carry out normal smelting treatment, including stirring, slag removal, refining and other operations to reach 720 ℃ guide furnace. Argon is used for refining during smelting.

[0022] 3. The molten aluminum introduced into the static furnace is refined with argon gas, and the subsequent casting and rolling is carried out after the temperature of the molten aluminum reaches 720°C.

[0023] 4. The processed aluminum liquid is cast and rolled after online degassing and filtering; online degassing uses argon; the launder between the degass...

Embodiment 2

[0028] 1. Smelting iron 0.65% by weight; silicon 0.23%; iron / silicon ratio 2.8; copper 0.16%; manganese 1.20%; National standard range, generally the content of a single impurity element ≤ 0.05%, the total content of miscellaneous elements ≤ 0.15%) and aluminum (aluminum is the balance) for the proportioning of 3003 alloy raw materials, all use aluminum ingots for remelting, without adding any form waste.

[0029] 2. Melt the raw materials and carry out normal smelting treatment, including stirring, slag removal, refining and other operations to reach 735 ℃ guide furnace. Argon is used for refining during smelting.

[0030] 3. The molten aluminum introduced into the static furnace is refined with argon gas, and the subsequent casting and rolling is carried out after the temperature of the molten aluminum reaches 730°C.

[0031] 4. The processed aluminum liquid is cast and rolled after online degassing and filtering; online degassing uses argon; the launder between the degass...

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Abstract

The invention relates to the field of aluminum alloy material manufacturing, in particular to a method for producing an aluminum strip for a power battery shell through a cast-rolling method. The method comprises the specific steps that raw material matching is carried out according to alloy components; after raw materials are molten, an additive is added to adjust the components; after being molten, the raw materials are guided into a standing furnace; after being subjected to online degassing and filtering, treated molten aluminum is subjected to cast-rolling; two times of modification treatment are carried out in a launder between a degassing box and the standing furnace and a launder between a filtering box and a cast-rolling machine; a produced cast-rolled plate blank is subjected to certain rolling, then subjected to inner ring and outer ring welding and then annealed at the thickness ranging from 4.0 mm to 9.0 mm; and an aluminum coil of the finished product thickness is subjected to secondary heat treatment and then subjected to slitting machining and is slit to the target width. The method is different from traditional hot rolling method production, the cast-rolling method is adopted for production, and cost reducing and period shortening are achieved.

Description

technical field [0001] The invention relates to a manufacturing technology of an aluminum alloy material, in particular to a method for producing an aluminum strip for a power battery casing by a casting and rolling method. Background technique [0002] The casing of the power battery is generally made of 3003 aluminum alloy. This material has easy processing and forming, high temperature corrosion resistance, good heat transfer and electrical conductivity. The aluminum power battery casing (except the casing cover) of 3003 aluminum alloy can be stretched and formed at one time. Compared with the stainless steel casing, the welding process at the bottom of the box can be omitted. 3003 is mainly an aluminum-manganese alloy, and the main alloying element is manganese. The boiling point temperature of aluminum and manganese is not much different, so there will be no problems such as the deterioration of weld seam quality due to the burning of metal elements during welding. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00B22D11/108B22D11/06C22F1/04
CPCB22D11/003B22D11/06B22D11/108C22C21/00C22F1/04
Inventor 吴保剑董则防徐成志王超新高龙
Owner JIANGSU DINGSHENG NEW MATERIAL JOINT STOCK CO LTD
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