Aluminium alloy plate for battery case and battery case made thereof

Abstract

This invention provides an aluminum alloy plate of battery shell for simultaneously enhancing compression strength and laser welding performance, and battery shell manufactured with this aluminum ally plate, namely, an aluminum alloy of battery shell composed of Si: 0.10-0.60 mass%, Fe: 0.05-0.60 mass%, over 0.70-below 1.0 mass%, Mn: 0.10-1.80 mass%, Mg: over 0.70-1.50 mass%, Zr: over 1.10-below 0.20 mass%, Ti: 0.03-0.25 mass%, surplus Al and unavoidable impurity, and aluminum alloy plate of battery shell manufactured with the chemical formulation and to be aged after manufacture.

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 with dimensions (inner dimensions) of thickness 4-7 mm, width 20-30 mm and height 40-60 mm. The battery part was placed in the case, and then the opening of the case was covered by an aluminum lid provided with an electrolyte solution pouring port, and the periphery was sealed by welding using a laser welding method. The aluminum foil cover may be made of the same ma...

AI Technical Summary

Problems solved by technology

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