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Aluminium alloy plate for battery case and manufacturing method thereof

A technology of aluminum alloy plates and battery casings, applied in metal rolling, battery pack components, circuits, etc., can solve problems such as creep characteristics or insufficient laser welding performance, and achieve excellent strength and creep characteristics, tensile strength Excellent deepness and the effect of suppressing the increase in shell thickness

Inactive Publication Date: 2009-02-04
SUMITOMO LIGHT METAL INDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, several aluminum alloy sheets for battery casings in which Mg or Cu was added in addition to Mn were proposed (for example, Japanese Patent Publication No. The performance required as a material for a prismatic battery case, such as resistance, may not be sufficient.

Method used

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  • Aluminium alloy plate for battery case and manufacturing method thereof
  • Aluminium alloy plate for battery case and manufacturing method thereof

Examples

Experimental program
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Embodiment 1

[0030] Embodiment 1, comparative example 1

[0031] Semi-continuous casting is used to cast ingots of aluminum alloys with the composition shown in Table 1, and the obtained ingots are subjected to homogenization treatment, hot rolling, cold rolling, intermediate annealing, final cold rolling, etc., and the thickness is 0.6mm. board. After setting the final cold-rolling degree to 25%, heat treatment was performed at 270°C. The obtained plates were used as test materials, and tensile properties, formability, laser weldability, and creep properties were evaluated by the following methods. The results are shown in Table 2. In addition, in Table 1, those that do not meet the conditions of the present invention are underlined.

[0032] Tensile properties: make JIS No. 5 test piece, conduct tensile test at room temperature, and those whose tensile strength is greater than 200MPa and elongation greater than 3% are qualified. Those with a tensile strength of less than 200 MPa have...

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Abstract

The purpose of the invention is to provide an aluminum alloy sheet used for battery casings which has excellent strength and creep property as well as drawing-reduction drawability, allows sealing through laser welding, can inhibit the increase of the casing thickness in charge and discharge circulation and is applicable to prismatic lithum-ion battery casings, and a manufacturing method thereof. The aluminum alloy sheet used for battery casings of the invention is characterized by comprising Mn which is more than 0.4 percent but less than 0.8 percent, 0.2 percent to 0.8 percent of Mg and Cu which is more than 0.7 percent but less than 1.2 percent; the total of Mn, Mg and Cu is 1.4 percent to 2.6 percent; as impurities, the content of Si is controlled to be less than 0.3 percent, the content of Fe is controlled to be less than 0.4 percent and the content of Zn is controlled to be less than 0.2 percent; the rest is Al and inevitable impurities.

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a battery casing, more specifically, to a high-strength, high-formability aluminum alloy plate suitable for use as a casing of a square lithium-ion battery used in a mobile phone or a notebook computer, and its manufacture method. Background technique [0002] The components assembled in mobile phones or notebook computers are strongly required to be light in weight. Therefore, for the shell material of the prismatic lithium-ion battery used in it, A3003 aluminum alloy plates should be used instead of the original steel plates or stainless steel plates. The shell of the square battery adopts laser welding technology and is sealed with pure aluminum or aluminum alloy plate. [0003] In the prismatic battery case formed by combining multiple processes of deep drawing and thinning, the Al-Mn-based A3003 aluminum alloy is a material that can reduce the thickness of the case while maintaining a g...

Claims

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Application Information

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IPC IPC(8): C22C21/00B21B1/22C22F1/04H01M2/02H01M50/119
CPCY02E60/10
Inventor 内田秀俊长井康礼伊藤智康
Owner SUMITOMO LIGHT METAL INDS LTD
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