Aluminum alloy plate for battery case and battery case made from same

Abstract

An aluminium alloy plate and a battery case made of the same are provided to offer proof pressure and laser welding at the same time by controlling the amount of Cu and Mg appropriately corresponding to a melting enhancement element. An aluminium alloy plate for a battery case includes Si of 0.10-0.60wt%, Fe of 0.05-0.60wt%, Cu 0.70-1.0wt%, Mn of 0.10-1.80wt%, Mg of 0.70-1.50 wt%, Zr of 0.10-0.20wt%, Ti of 0.03-0.25wt%, Al and residue of essential impurities. The invention also provides an aluminum alloy plate for a battery case which has the above chemical composition and is aged after molding.

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a battery case having good withstand pressure for producing a lithium ion secondary battery case and the like, and a battery case made of the alloy plate. Background technique [0002] In order to reduce weight, cases of lithium ion secondary batteries installed in mobile phones, PCs, etc. are manufactured by widely using A3003 alloy which has excellent formability and high strength. A battery case is manufactured by pressing an aluminum alloy plate with a thickness of about 0.6 mm. Known casings are generally ironed containers having dimensions (inner dimensions) of thickness 4-7 mm, width 20-30 mm and height 40-60 mm. The battery part is placed in the case, and the opening of the case is covered by an aluminum lid provided with an electrolyte solution pouring port, and the periphery is sealed by welding using a laser welding method. The aluminum foil cover may be made of the same material...

AI Technical Summary

Problems solved by technology

[0011] But the disadvantage of the technology disclosed in Japanese Patent Laid-Open (A) No. 2005-336540 is that the Mg content is too low, so the aluminum plate is poor in pressure resistance

[0012] Thus, in the techniques disclosed in Japanese Patent Laid-Open (A) No. 2006-169574 and Japanese Patent Laid-Open (A) No. 2005-336540, both pressure resistance and laser weldability cannot be simultaneously satisfied.

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