Aluminium alloy plate used for battery housing and battery housing

Abstract

The invention provides an aluminum alloy plate used for a battery housing used for deep-draw processing, and the battery housing using the aluminum alloy plate. The occurrence of hot adhesion in a forming processing process can be prevented. And the aluminum and the battery housing has excellent pulse weldability. The aluminum plate used for the battery shell contains, by mass, 0.1 percent to 2.0 percents of Fe, 0.05 percent to 0.5 percent of Si, 0.05 percent to 0.5 percent of Mn, less than 0.04 percent of Ti, less than 10 percents of B and rest of Al and inevitable impurities. In the central part in a thickness direction of the section of the aluminum alloy plate used for the battery housing, the area rate of intermetallic compound having a maximum length more than 1 micrometer is 0.3 to 3.5 percents, and the number of the intermetallic compound having maximum length more than 11 micrometers is less than 140 / mm2. The electric conductivity of the aluminum alloy plate used for the battery housing is lower than 62 IACS percent.

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a lithium battery case mounted on an automobile and a battery case manufactured using the aluminum alloy plate. Background technique [0002] Conventionally, nickel-hydrogen batteries have been mainly used as fuel cells for automobiles, but in recent years, lithium-ion batteries used in mobile phones and personal computers have been partially adopted due to reasons such as light weight and high energy density. [0003] Lithium-ion batteries have a structure in which the battery case including the main body and the lid functions as an electrode, and a highly conductive aluminum material is used as a material for the battery case. In addition, since the aluminum material can be deep-drawn, it is possible to manufacture a rectangular or circular container as a battery case by forming. [0004] Here, when a cell phone battery is used as a single unit, a high-strength JISA 3000-series aluminum al...

AI Technical Summary

Problems solved by technology

However, in JISA1000 series aluminum alloys, if the penetration depth exceeds 0.25mm, the shape stability of the weld bead will be significantly reduced, and the incidence of irregular weld bead will increase sharply in pulsed laser welding.

The problem with this irregular bead is that, depending on the situation, the depth of penetration penetrates to the back of the material to be welded, which adversely affects performance such as electrical conductivity and operating voltage.

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