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Aluminum alloy sheet for battery case and battery case

A technology for aluminum alloy plates and battery casings, which is applied to battery boxes/coats, battery covers/end covers, battery pack components, etc. It can solve problems such as discontinuity of welded parts, achieve excellent formability, and prevent cracks , Prevent the effect of welding

Inactive Publication Date: 2010-10-06
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, as the welding speed of pulsed laser welding in the manufacture of battery cases has increased, there have been problems such as the formation of abnormal parts (irregular weld seams) at the welded part and the occurrence of discontinuity in the welded part.

Method used

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  • Aluminum alloy sheet for battery case and battery case
  • Aluminum alloy sheet for battery case and battery case
  • Aluminum alloy sheet for battery case and battery case

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0111] The mode for carrying out the present invention has been described above, and the examples in which the effects of the present invention were confirmed are compared with comparative examples in which the main conditions of the present invention are not satisfied. In addition, this invention is not limited to this Example.

[0112] [Preparation of test materials]

[0113] (Example No.1-17, Comparative Example No.18-35)

[0114] Aluminum alloys having the compositions shown in Table 1 were melted and cast to form ingots, and the ingots were plane-cut and then subjected to a homogenization heat treatment at 500° C. for 4 hours. The averaged ingot was hot-rolled and then cold-rolled to obtain a rolled sheet having a thickness of about 0.7 mm. Then, the rolled sheet was heated to 500° C. at a heating rate of 500° C. / minute, kept at this temperature for 30 seconds, and then cooled at a cooling rate of 500° C. / minute to perform intermediate annealing. Finally, final cold ro...

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Abstract

The invention provides an aluminum alloy sheet, including 0.4-1.5% by mass of Mn, 0.7-4.0% by mass of Cu, 0.2-1.5% by mass of Mg, 0.05-1.0% by mass of Si, 0.05-1.0% by mass of Fe, balance of Al and inevitable impurities. In the inevitable impurities including, less than 0.3% by mass of Zn, less than 0.02% by mass of Ti, less than 20 mass ppm. In the plate thickness direction center portion of the section of the aluminium alloy plate, the area ration of intermetallic compounds having a maximum length higher than 1mum is more than 0.3% and less than 2.1%, and the number of intermetallic compounds having the maximum length higher than 11mum is less than 140 / mm2. The aluminum alloy sheet has excellent formability, pulse laser welding performance, strength, and pressure resistance (expansion resistance) and is suitable for the battery case.

Description

technical field [0001] The present invention relates to an aluminum alloy plate suitable for lithium-ion secondary battery casings and the like, a manufacturing method thereof, and a battery casing using the aluminum alloy plate. Background technique [0002] Lithium-ion secondary batteries are widely used as power sources for mobile phones and notebook personal computers. The material for the outer casing of the secondary battery (hereinafter referred to as the battery case as appropriate) is currently using aluminum such as JISA3003 alloy in order to meet the requirements of the miniaturization and weight reduction of the battery and the processing type (formability) for forming the battery case. alloy. In such a battery, the internal pressure of the battery case rises during charging and discharging. In addition, in the high-temperature environment of a car in summer, the temperature of the battery case itself reaches 60°C to 90°C in case of electronic equipment equippe...

Claims

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Application Information

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IPC IPC(8): C22C21/16H01M2/02H01M50/119H01M50/131H01M50/138H01M50/14
CPCY02E60/10C22C21/14C22C21/16C22C21/18C22F1/04B22D21/04C22C2202/00H01M50/147H01M50/119
Inventor 小林一德松本刚日野光雄
Owner KOBE STEEL LTD
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