Aluminium alloy with excellent laser weldability

Abstract

The invention provides an aluminum alloy plate with excellent laser weldability which can get better fusion state even under low output power. The aluminum alloy plate is characterized in that aluminum alloy contains 0.6%-10% of Si, less than 0.2% of Cu, less than 0.2% of Mg, and balance of aluminum and unavoidable impurities; and number of Si single-phase of 2mum-5mum and intermetallic compound in per 10000mum<2> is more than 40.

Description

technical field [0001] The present invention relates to an aluminum alloy sheet for manufacturing components or housings by laser welding, and in particular, to an aluminum alloy plate suitable for use as a case cover of a lithium ion battery used in a mobile phone or a notebook computer, etc., and having excellent laser weldability aluminum alloy sheet. Background technique [0002] Lithium batteries are widely used as power sources for driving automobiles and mobile devices due to their small size and large capacity. In particular, since light weight is strongly required for components assembled in mobile phones and notebook computers, etc., Al-Mn-based A3003 aluminum alloy plates have begun to be used instead of steel plates or stainless steel plates in lithium-ion battery case materials. . [0003] In the prismatic battery case formed by combining multiple processes of drawing and thinning, the Al-Mn-based A3003 aluminum alloy can make the case thinner while maintainin...

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Problems solved by technology

[0008] If the above materials are used as the battery case cover material, it is advantageous from the viewpoint of laser weldability, but since the material strength is higher than that of pure aluminum-based alloys, it is difficult to impart explosion-proof performance during molding

In addition, when alloys containing a large amount of Fe and Mn are used, coarse intermetallic compounds are likely to be formed during casting, and if such coarse intermetallic compounds exist in the molded part that imparts explosion-proof performance, they will become the origin of cracks. , is not ideal

[0009] An aluminum alloy plate for a battery case with 0.4% to 0.6% of Mn and 1.15% to 1.35% of Fe as main components has also been proposed (Japanese Patent Laid-Open No. 2007-107048), which exhibits excellent explosion-proof performance, but The specific characteristics of laser weldability are not clear, and the aluminum alloy plates in the above proposals are used as materials for lithium-ion battery case covers, and none of them have the characteristics that must be satisfied.

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